[PATCH v3 00/40] fsi: Add interrupt support

[PATCH v3 00/40] fsi: Add interrupt support

[Eddie James]

This series primarily adds interrupt support to the FSI driver subsystem.
There are a number of related changes and fixes. Firstly, the FSI clocking
model is improved to allow FSI engine drivers to obtain real clock rates
and calculate appropriate clock dividers. Secondly, much master code is
made common through the use of a regmap to access master registers. This
will prove more useful as additional FSI master drivers are added. Lastly,
interrupt support is added to the FSI I2C driver.

Changes since v2:
 - Add several patches to fix additional issues found during testing
 - For local bus frequenccy, use cfam clock-frequency property instead of
   hardcoded master local bus divider
 - Change default local bus clock divider from 8 to 2
 - Zero the regmap_config structure in the common FSI initialization
   function
 - Add AST2700 direct AHB access of master registers
 - Remove slave interrupt handler since it's not used yet
 - For I2C driver, change minimum clock div to 3, use DIV_ROUND_UP instead
   of re-implementing it, and use better logic for checking for
   clock-frequency property
 - Add detail to I2C driver formatting change

Eddie James (40):
  fsi: hub: Set master index to link number plus one
  fsi: Move slave definitions to fsi-slave.h
  fsi: Fix slave addressing after break command
  fsi: Use a defined value for default echo delay
  fsi: Calculate local bus clock frequency
  fsi: core: Improve master read/write/error traces
  fsi: core: Add slave error trace
  fsi: core: Reset errors instead of clearing interrupts
  fsi: aspeed: Add AST2700 support
  fsi: core: Add slave spinlock
  fsi: core: Allow cfam device type aliases
  fsi: core: Add common regmap master functions
  fsi: core: Disable relative addressing during scan
  fsi: hub: Use common initialization and link enable
  fsi: aspeed: Use common initialization and link enable
  fsi: aspeed: Remove cfam reset sysfs file in error path and remove
  fsi: aspeed: Refactor trace functions
  fsi: aspeed: Don't clear all IRQs during OPB transfers
  fsi: aspeed: Only read result register for successful read
  fsi: aspeed: Switch to spinlock
  fsi: aspeed: Disable relative addressing and IPOLL for cfam reset
  fsi: aspeed: Use common master error handler
  fsi: core: Add interrupt support
  fsi: aspeed: Add interrupt support
  fsi: hub: Add interrupt support
  i2c: fsi: Calculate clock divider from local bus frequency
  i2c: fsi: Improve formatting
  i2c: fsi: Change fsi_i2c_write_reg to accept data instead of a pointer
  i2c: fsi: Remove list structure of ports
  i2c: fsi: Define a function to check status error bits
  i2c: fsi: Add boolean for skip stop command on abort
  i2c: fsi: Add interrupt support
  fsi: hub master: Reset hub master after errors
  fsi: core: Add master register read-only sysfs
  fsi: core: Add slave register read-only sysfs
  fsi: i2cr: Adjust virtual CFAM ID to match Odyssey chip
  fsi: core: Add different types of CFAM
  spi: fsi: Calculate clock divider from local bus frequency
  ARM: dts: aspeed: P10 and tacoma: Set FSI clock frequency
  ARM: dts: aspeed: P10: Bump SPI max frequencies

 .../dts/aspeed/aspeed-bmc-ibm-everest.dts     |  32 +-
 .../boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts |   1 +
 .../arm/boot/dts/aspeed/ibm-power10-dual.dtsi |  17 +-
 .../arm/boot/dts/aspeed/ibm-power10-quad.dtsi |  16 +-
 drivers/fsi/Kconfig                           |   2 +
 drivers/fsi/fsi-core.c                        | 888 +++++++++++++++---
 drivers/fsi/fsi-master-aspeed.c               | 431 +++++----
 drivers/fsi/fsi-master-hub.c                  | 244 ++---
 drivers/fsi/fsi-master-i2cr.c                 |   2 +-
 drivers/fsi/fsi-master.h                      |  33 +
 drivers/fsi/fsi-slave.h                       | 118 +++
 drivers/i2c/busses/i2c-fsi.c                  | 463 ++++++---
 drivers/spi/spi-fsi.c                         |  33 +-
 include/linux/fsi.h                           |   3 +
 include/trace/events/fsi.h                    | 190 ++--
 include/trace/events/fsi_master_aspeed.h      |  86 +-
 include/trace/events/i2c_fsi.h                |  45 +
 17 files changed, 1917 insertions(+), 687 deletions(-)
 create mode 100644 include/trace/events/i2c_fsi.h

-- 
2.39.3

[PATCH v3 01/40] fsi: hub: Set master index to link number plus one

[Eddie James]

Hub master indexing is problematic if a hub is rescanned while the root
master is being rescanned. Therefore, request a specific index in the hub
driver.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-hub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index 6d8b6e8854e56..36da643b32018 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 
 #include "fsi-master.h"
+#include "fsi-slave.h"
 
 #define FSI_ENGID_HUB_MASTER		0x1c
 
@@ -229,6 +230,7 @@ static int hub_master_probe(struct device *dev)
 	hub->master.dev.release = hub_master_release;
 	hub->master.dev.of_node = of_node_get(dev_of_node(dev));
 
+	hub->master.idx = fsi_dev->slave->link + 1;
 	hub->master.n_links = links;
 	hub->master.read = hub_master_read;
 	hub->master.write = hub_master_write;
-- 
2.39.3

[PATCH v3 02/40] fsi: Move slave definitions to fsi-slave.h

[Eddie James]

Master drivers may need access to the slave definitions.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c  | 35 -----------------
 drivers/fsi/fsi-slave.h | 84 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+), 35 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 097d5a780264c..7bf0c96fc0172 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -45,41 +45,6 @@
 
 static const int engine_page_size = 0x400;
 
-#define FSI_SLAVE_BASE			0x800
-
-/*
- * FSI slave engine control register offsets
- */
-#define FSI_SMODE		0x0	/* R/W: Mode register */
-#define FSI_SISC		0x8	/* R/W: Interrupt condition */
-#define FSI_SSTAT		0x14	/* R  : Slave status */
-#define FSI_SLBUS		0x30	/* W  : LBUS Ownership */
-#define FSI_LLMODE		0x100	/* R/W: Link layer mode register */
-
-/*
- * SMODE fields
- */
-#define FSI_SMODE_WSC		0x80000000	/* Warm start done */
-#define FSI_SMODE_ECRC		0x20000000	/* Hw CRC check */
-#define FSI_SMODE_SID_SHIFT	24		/* ID shift */
-#define FSI_SMODE_SID_MASK	3		/* ID Mask */
-#define FSI_SMODE_ED_SHIFT	20		/* Echo delay shift */
-#define FSI_SMODE_ED_MASK	0xf		/* Echo delay mask */
-#define FSI_SMODE_SD_SHIFT	16		/* Send delay shift */
-#define FSI_SMODE_SD_MASK	0xf		/* Send delay mask */
-#define FSI_SMODE_LBCRR_SHIFT	8		/* Clk ratio shift */
-#define FSI_SMODE_LBCRR_MASK	0xf		/* Clk ratio mask */
-
-/*
- * SLBUS fields
- */
-#define FSI_SLBUS_FORCE		0x80000000	/* Force LBUS ownership */
-
-/*
- * LLMODE fields
- */
-#define FSI_LLMODE_ASYNC	0x1
-
 #define FSI_SLAVE_SIZE_23b		0x800000
 
 static DEFINE_IDA(master_ida);
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index 1d63a585829dd..dba65bd4e083f 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -7,6 +7,90 @@
 #include <linux/cdev.h>
 #include <linux/device.h>
 
+#define FSI_SLAVE_BASE			0x800
+
+/*
+ * FSI slave engine control register offsets
+ */
+#define FSI_SMODE		0x0	/* R/W: Mode register */
+#define FSI_SISC		0x8	/* R  : Interrupt condition */
+#define FSI_SCISC		0x8	/* C  : Clear interrupt condition */
+#define FSI_SISM		0xc	/* R/W: Interrupt mask */
+#define FSI_SISS		0x10	/* R  : Interrupt status */
+#define FSI_SSISM		0x10	/* S  : Set interrupt mask */
+#define FSI_SCISM		0x14	/* C  : Clear interrupt mask */
+#define FSI_SSTAT		0x14	/* R  : Slave status */
+#define FSI_SI1S		0x1c	/* R  : Slave interrupt 1 status */
+#define FSI_SSI1M		0x1c	/* S  : Set slave interrupt 1 mask */
+#define FSI_SCI1M		0x20	/* C  : Clear slave interrupt 1 mask */
+#define FSI_SLBUS		0x30	/* W  : LBUS Ownership */
+#define FSI_SRSIC0		0x68	/* C  : Clear remote interrupt condition */
+#define FSI_SRSIC4		0x6c	/* C  : Clear remote interrupt condition */
+#define FSI_SRSIM0		0x70	/* R/W: Remote interrupt mask */
+#define FSI_SRSIM4		0x74	/* R/W: Remote interrupt mask */
+#define FSI_SRSIS0		0x78	/* R  : Remote interrupt status */
+#define FSI_SRSIS4		0x7c	/* R  : Remote interrupt status */
+#define FSI_LLMODE		0x100	/* R/W: Link layer mode register */
+
+/*
+ * SMODE fields
+ */
+#define FSI_SMODE_WSC		0x80000000	/* Warm start done */
+#define FSI_SMODE_ECRC		0x20000000	/* Hw CRC check */
+#define FSI_SMODE_SID_SHIFT	24		/* ID shift */
+#define FSI_SMODE_SID_MASK	3		/* ID Mask */
+#define FSI_SMODE_ED_SHIFT	20		/* Echo delay shift */
+#define FSI_SMODE_ED_MASK	0xf		/* Echo delay mask */
+#define FSI_SMODE_SD_SHIFT	16		/* Send delay shift */
+#define FSI_SMODE_SD_MASK	0xf		/* Send delay mask */
+#define FSI_SMODE_LBCRR_SHIFT	8		/* Clk ratio shift */
+#define FSI_SMODE_LBCRR_MASK	0xf		/* Clk ratio mask */
+
+/*
+ * SISS fields
+ */
+#define FSI_SISS_CRC_ERROR		BIT(31)
+#define FSI_SISS_PROTO_ERROR		BIT(30)
+#define FSI_SISS_LBUS_PARITY_ERROR	BIT(29)
+#define FSI_SISS_LBUS_PROTO_ERROR	BIT(28)
+#define FSI_SISS_ACCESS_ERROR		BIT(27)
+#define FSI_SISS_LBUS_OWNERSHIP_ERROR	BIT(26)
+#define FSI_SISS_LBUS_OWNERSHIP_CHANGE	BIT(25)
+#define FSI_SISS_ASYNC_MODE_ERROR	BIT(14)
+#define FSI_SISS_OPB_ACCESS_ERROR	BIT(13)
+#define FSI_SISS_OPB_FENCED		BIT(12)
+#define FSI_SISS_OPB_PARITY_ERROR	BIT(11)
+#define FSI_SISS_OPB_PROTO_ERROR	BIT(10)
+#define FSI_SISS_OPB_TIMEOUT		BIT(9)
+#define FSI_SISS_OPB_ERROR_ACK		BIT(8)
+#define FSI_SISS_MFSI_MASTER_ERROR	BIT(3)
+#define FSI_SISS_MFSI_PORT_ERROR	BIT(2)
+#define FSI_SISS_MFSI_HP		BIT(1)
+#define FSI_SISS_MFSI_CR_PARITY_ERROR	BIT(0)
+#define FSI_SISS_ALL			0xfe007f00
+
+/*
+ * SI1S fields
+ */
+#define FSI_SI1S_SLAVE_BIT	31
+#define FSI_SI1S_SHIFT_BIT	30
+#define FSI_SI1S_SCOM_BIT	29
+#define FSI_SI1S_SCRATCH_BIT	28
+#define FSI_SI1S_I2C_BIT	27
+#define FSI_SI1S_SPI_BIT	26
+#define FSI_SI1S_SBEFIFO_BIT	25
+#define FSI_SI1S_MBOX_BIT	24
+
+/*
+ * SLBUS fields
+ */
+#define FSI_SLBUS_FORCE		0x80000000	/* Force LBUS ownership */
+
+/*
+ * LLMODE fields
+ */
+#define FSI_LLMODE_ASYNC	0x1
+
 struct fsi_master;
 
 struct fsi_slave {
-- 
2.39.3

[PATCH v3 03/40] fsi: Fix slave addressing after break command

[Eddie James]

After a break command, the slave ID is set to 0x3, which means the
FSI driver should use that ID when communicating with the slave, until
SMODE is programmed with the new ID (forced to 0 for 23 bit addressing in
the current implementation). This worked previously due to a feature of
newer FSI slaves that don't enforce this requirement. Since hub masters
cannot address non-zero slave IDs, disable this behavior for slaves off
hub masters.

Fixes: 2b545cd8e1b2 ("drivers/fsi: Implement slave initialisation")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c       | 20 ++++++++++----------
 drivers/fsi/fsi-master-hub.c |  1 +
 drivers/fsi/fsi-master.h     |  1 +
 drivers/fsi/fsi-slave.h      |  1 +
 4 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 7bf0c96fc0172..e8dbf5e95c234 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -217,7 +217,7 @@ static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly)
 		| fsi_smode_lbcrr(0x8);
 }
 
-static int fsi_slave_set_smode(struct fsi_slave *slave)
+static int fsi_slave_set_smode(struct fsi_slave *slave, uint8_t id)
 {
 	uint32_t smode;
 	__be32 data;
@@ -228,8 +228,7 @@ static int fsi_slave_set_smode(struct fsi_slave *slave)
 	smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay);
 	data = cpu_to_be32(smode);
 
-	return fsi_master_write(slave->master, slave->link, slave->id,
-				FSI_SLAVE_BASE + FSI_SMODE,
+	return fsi_master_write(slave->master, slave->link, id, FSI_SLAVE_BASE + FSI_SMODE,
 				&data, sizeof(data));
 }
 
@@ -281,7 +280,7 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
 	slave->t_send_delay = send_delay;
 	slave->t_echo_delay = echo_delay;
 
-	rc = fsi_slave_set_smode(slave);
+	rc = fsi_slave_set_smode(slave, FSI_SMODE_SID_BREAK);
 	if (rc)
 		return rc;
 
@@ -773,7 +772,7 @@ static ssize_t slave_send_echo_store(struct device *dev,
 	slave->t_send_delay = val;
 	slave->t_echo_delay = val;
 
-	rc = fsi_slave_set_smode(slave);
+	rc = fsi_slave_set_smode(slave, slave->id);
 	if (rc < 0)
 		return rc;
 	if (master->link_config)
@@ -945,6 +944,8 @@ EXPORT_SYMBOL_GPL(fsi_free_minor);
 
 static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 {
+	const uint8_t break_id = (master->flags & FSI_MASTER_FLAG_NO_BREAK_SID) ? 0 :
+		FSI_SMODE_SID_BREAK;
 	uint32_t cfam_id;
 	struct fsi_slave *slave;
 	uint8_t crc;
@@ -957,7 +958,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	if (id != 0)
 		return -EINVAL;
 
-	rc = fsi_master_read(master, link, id, 0, &data, sizeof(data));
+	rc = fsi_master_read(master, link, break_id, 0, &data, sizeof(data));
 	if (rc) {
 		dev_dbg(&master->dev, "can't read slave %02x:%02x %d\n",
 				link, id, rc);
@@ -981,9 +982,8 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	 */
 	if (master->flags & FSI_MASTER_FLAG_SWCLOCK) {
 		llmode = cpu_to_be32(FSI_LLMODE_ASYNC);
-		rc = fsi_master_write(master, link, id,
-				FSI_SLAVE_BASE + FSI_LLMODE,
-				&llmode, sizeof(llmode));
+		rc = fsi_master_write(master, link, break_id, FSI_SLAVE_BASE + FSI_LLMODE, &llmode,
+				      sizeof(llmode));
 		if (rc)
 			dev_warn(&master->dev,
 				"can't set llmode on slave:%02x:%02x %d\n",
@@ -1028,7 +1028,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 			 "can't set slbus on slave:%02x:%02x %d\n", link, id,
 			 rc);
 
-	rc = fsi_slave_set_smode(slave);
+	rc = fsi_slave_set_smode(slave, break_id);
 	if (rc) {
 		dev_warn(&master->dev,
 				"can't set smode on slave:%02x:%02x %d\n",
diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index 36da643b32018..eea8649fee74d 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -232,6 +232,7 @@ static int hub_master_probe(struct device *dev)
 
 	hub->master.idx = fsi_dev->slave->link + 1;
 	hub->master.n_links = links;
+	hub->master.flags = FSI_MASTER_FLAG_NO_BREAK_SID;
 	hub->master.read = hub_master_read;
 	hub->master.write = hub_master_write;
 	hub->master.send_break = hub_master_break;
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index 967622c1cabf7..a0d7ad0f0f7cc 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -111,6 +111,7 @@
 
 /* fsi-master definition and flags */
 #define FSI_MASTER_FLAG_SWCLOCK		0x1
+#define FSI_MASTER_FLAG_NO_BREAK_SID	0x2
 
 /*
  * Structures and function prototypes
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index dba65bd4e083f..f6cca04131a92 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -39,6 +39,7 @@
 #define FSI_SMODE_ECRC		0x20000000	/* Hw CRC check */
 #define FSI_SMODE_SID_SHIFT	24		/* ID shift */
 #define FSI_SMODE_SID_MASK	3		/* ID Mask */
+#define FSI_SMODE_SID_BREAK	3		/* ID after break command */
 #define FSI_SMODE_ED_SHIFT	20		/* Echo delay shift */
 #define FSI_SMODE_ED_MASK	0xf		/* Echo delay mask */
 #define FSI_SMODE_SD_SHIFT	16		/* Send delay shift */
-- 
2.39.3

[PATCH v3 04/40] fsi: Use a defined value for default echo delay

[Eddie James]

Avoid hardcoding '16' several times.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c  | 6 +++---
 drivers/fsi/fsi-slave.h | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index e8dbf5e95c234..27235583183e5 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1008,8 +1008,8 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	slave->link = link;
 	slave->id = id;
 	slave->size = FSI_SLAVE_SIZE_23b;
-	slave->t_send_delay = 16;
-	slave->t_echo_delay = 16;
+	slave->t_send_delay = FSI_SMODE_SD_DEFAULT;
+	slave->t_echo_delay = FSI_SMODE_ED_DEFAULT;
 
 	/* Get chip ID if any */
 	slave->chip_id = -1;
@@ -1160,7 +1160,7 @@ static int fsi_master_break(struct fsi_master *master, int link)
 	if (master->send_break)
 		rc = master->send_break(master, link);
 	if (master->link_config)
-		master->link_config(master, link, 16, 16);
+		master->link_config(master, link, FSI_SMODE_SD_DEFAULT, FSI_SMODE_ED_DEFAULT);
 
 	return rc;
 }
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index f6cca04131a92..45190b06fa027 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -42,8 +42,10 @@
 #define FSI_SMODE_SID_BREAK	3		/* ID after break command */
 #define FSI_SMODE_ED_SHIFT	20		/* Echo delay shift */
 #define FSI_SMODE_ED_MASK	0xf		/* Echo delay mask */
+#define FSI_SMODE_ED_DEFAULT	 16		/* Default echo delay */
 #define FSI_SMODE_SD_SHIFT	16		/* Send delay shift */
 #define FSI_SMODE_SD_MASK	0xf		/* Send delay mask */
+#define FSI_SMODE_SD_DEFAULT	 16		/* Default send delay */
 #define FSI_SMODE_LBCRR_SHIFT	8		/* Clk ratio shift */
 #define FSI_SMODE_LBCRR_MASK	0xf		/* Clk ratio mask */
 
-- 
2.39.3

[PATCH v3 05/40] fsi: Calculate local bus clock frequency

[Eddie James]

Instead of a hardcoded local bus clock divider, calculate the responder
local bus frequency from the FSI bus frequency.  This will allow FSI
engine drivers to set and calculate their bus (I2C, SPI, etc) frequencies.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Use cfam clock-frequency property instead of hardcoded master local bus
   divider
 - Change default local bus clock divider from 8 to 2

 drivers/fsi/fsi-core.c   | 22 +++++++++++++++++++---
 drivers/fsi/fsi-master.h |  1 +
 drivers/fsi/fsi-slave.h  |  2 ++
 include/linux/fsi.h      |  1 +
 4 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 27235583183e5..44875f2350b04 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -109,6 +109,12 @@ int fsi_device_peek(struct fsi_device *dev, void *val)
 	return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
 }
 
+unsigned long fsi_device_local_bus_frequency(struct fsi_device *dev)
+{
+	return dev->slave->master->clock_frequency / dev->slave->clock_div;
+}
+EXPORT_SYMBOL_GPL(fsi_device_local_bus_frequency);
+
 static void fsi_device_release(struct device *_device)
 {
 	struct fsi_device *device = to_fsi_dev(_device);
@@ -209,12 +215,12 @@ static inline uint32_t fsi_smode_sid(int x)
 	return (x & FSI_SMODE_SID_MASK) << FSI_SMODE_SID_SHIFT;
 }
 
-static uint32_t fsi_slave_smode(int id, u8 t_senddly, u8 t_echodly)
+static uint32_t fsi_slave_smode(int id, int div, u8 t_senddly, u8 t_echodly)
 {
 	return FSI_SMODE_WSC | FSI_SMODE_ECRC
 		| fsi_smode_sid(id)
 		| fsi_smode_echodly(t_echodly - 1) | fsi_smode_senddly(t_senddly - 1)
-		| fsi_smode_lbcrr(0x8);
+		| fsi_smode_lbcrr(div - 1);
 }
 
 static int fsi_slave_set_smode(struct fsi_slave *slave, uint8_t id)
@@ -225,7 +231,8 @@ static int fsi_slave_set_smode(struct fsi_slave *slave, uint8_t id)
 	/* set our smode register with the slave ID field to 0; this enables
 	 * extended slave addressing
 	 */
-	smode = fsi_slave_smode(slave->id, slave->t_send_delay, slave->t_echo_delay);
+	smode = fsi_slave_smode(slave->id, slave->clock_div, slave->t_send_delay,
+				slave->t_echo_delay);
 	data = cpu_to_be32(smode);
 
 	return fsi_master_write(slave->master, slave->link, id, FSI_SLAVE_BASE + FSI_SMODE,
@@ -950,6 +957,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	struct fsi_slave *slave;
 	uint8_t crc;
 	__be32 data, llmode, slbus;
+	u32 clock;
 	int rc;
 
 	/* Currently, we only support single slaves on a link, and use the
@@ -1003,6 +1011,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
 	slave->dev.release = fsi_slave_release;
 	device_initialize(&slave->dev);
+	slave->clock_div = FSI_SMODE_LBCRR_DEFAULT;
 	slave->cfam_id = cfam_id;
 	slave->master = master;
 	slave->link = link;
@@ -1020,6 +1029,10 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 
 	}
 
+	if (master->clock_frequency && !device_property_read_u32(&slave->dev, "clock-frequency",
+								 &clock) && clock)
+		slave->clock_div = DIV_ROUND_UP(master->clock_frequency, clock);
+
 	slbus = cpu_to_be32(FSI_SLBUS_FORCE);
 	rc = fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SLBUS,
 			      &slbus, sizeof(slbus));
@@ -1289,6 +1302,9 @@ int fsi_master_register(struct fsi_master *master)
 	if (!dev_name(&master->dev))
 		dev_set_name(&master->dev, "fsi%d", master->idx);
 
+	if (master->flags & FSI_MASTER_FLAG_SWCLOCK)
+		master->clock_frequency = 100000000; // POWER reference clock
+
 	master->dev.class = &fsi_master_class;
 
 	mutex_lock(&master->scan_lock);
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index a0d7ad0f0f7cc..ff23983ea84c8 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -121,6 +121,7 @@
 
 struct fsi_master {
 	struct device	dev;
+	unsigned long	clock_frequency;
 	int		idx;
 	int		n_links;
 	int		flags;
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index 45190b06fa027..fabc0b66d5bf3 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -48,6 +48,7 @@
 #define FSI_SMODE_SD_DEFAULT	 16		/* Default send delay */
 #define FSI_SMODE_LBCRR_SHIFT	8		/* Clk ratio shift */
 #define FSI_SMODE_LBCRR_MASK	0xf		/* Clk ratio mask */
+#define FSI_SMODE_LBCRR_DEFAULT	 2		/* Default clk ratio */
 
 /*
  * SISS fields
@@ -104,6 +105,7 @@ struct fsi_slave {
 	int			id;	/* FSI address */
 	int			link;	/* FSI link# */
 	u32			cfam_id;
+	u32			clock_div;
 	int			chip_id;
 	uint32_t		size;	/* size of slave address space */
 	u8			t_send_delay;
diff --git a/include/linux/fsi.h b/include/linux/fsi.h
index 3df8c54868df5..e0309bf0ae072 100644
--- a/include/linux/fsi.h
+++ b/include/linux/fsi.h
@@ -24,6 +24,7 @@ extern int fsi_device_read(struct fsi_device *dev, uint32_t addr,
 extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
 		const void *val, size_t size);
 extern int fsi_device_peek(struct fsi_device *dev, void *val);
+extern unsigned long fsi_device_local_bus_frequency(struct fsi_device *dev);
 
 struct fsi_device_id {
 	u8	engine_type;
-- 
2.39.3

[PATCH v3 06/40] fsi: core: Improve master read/write/error traces

[Eddie James]

Consolidate the master read and write traces into one trace and
change the result trace into an error trace for less spam.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c     |  26 +++++----
 include/trace/events/fsi.h | 112 ++++++++++++-------------------------
 2 files changed, 51 insertions(+), 87 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 44875f2350b04..b3029f9c05e4a 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1116,14 +1116,15 @@ static int fsi_master_read(struct fsi_master *master, int link,
 {
 	int rc;
 
-	trace_fsi_master_read(master, link, slave_id, addr, size);
-
 	rc = fsi_check_access(addr, size);
-	if (!rc)
+	if (!rc) {
 		rc = master->read(master, link, slave_id, addr, val, size);
-
-	trace_fsi_master_rw_result(master, link, slave_id, addr, size,
-			false, val, rc);
+		if (rc)
+			trace_fsi_master_error(master->idx, link, slave_id, addr, size, val, rc,
+					       true);
+		else
+			trace_fsi_master_xfer(master->idx, link, slave_id, addr, size, val, true);
+	}
 
 	return rc;
 }
@@ -1133,14 +1134,15 @@ static int fsi_master_write(struct fsi_master *master, int link,
 {
 	int rc;
 
-	trace_fsi_master_write(master, link, slave_id, addr, size, val);
-
 	rc = fsi_check_access(addr, size);
-	if (!rc)
+	if (!rc) {
 		rc = master->write(master, link, slave_id, addr, val, size);
-
-	trace_fsi_master_rw_result(master, link, slave_id, addr, size,
-			true, val, rc);
+		if (rc)
+			trace_fsi_master_error(master->idx, link, slave_id, addr, size, val, rc,
+					       false);
+		else
+			trace_fsi_master_xfer(master->idx, link, slave_id, addr, size, val, false);
+	}
 
 	return rc;
 }
diff --git a/include/trace/events/fsi.h b/include/trace/events/fsi.h
index 5ff15126ad9d5..fed8835f438e5 100644
--- a/include/trace/events/fsi.h
+++ b/include/trace/events/fsi.h
@@ -8,101 +8,63 @@
 
 #include <linux/tracepoint.h>
 
-TRACE_EVENT(fsi_master_read,
-	TP_PROTO(const struct fsi_master *master, int link, int id,
-			uint32_t addr, size_t size),
-	TP_ARGS(master, link, id, addr, size),
+TRACE_EVENT(fsi_master_xfer,
+	TP_PROTO(int master_idx, int link, int id, uint32_t addr, size_t size, const void *data,
+		 bool read),
+	TP_ARGS(master_idx, link, id, addr, size, data, read),
 	TP_STRUCT__entry(
-		__field(int,	master_idx)
-		__field(int,	link)
-		__field(int,	id)
-		__field(__u32,	addr)
-		__field(size_t,	size)
+		__field(int, master_idx)
+		__field(int, link)
+		__field(int, id)
+		__field(uint32_t, addr)
+		__field(int, size)
+		__field(uint32_t, data)
+		__field(bool, read)
 	),
 	TP_fast_assign(
-		__entry->master_idx = master->idx;
+		__entry->master_idx = master_idx;
 		__entry->link = link;
 		__entry->id = id;
 		__entry->addr = addr;
-		__entry->size = size;
-	),
-	TP_printk("fsi%d:%02d:%02d %08x[%zu]",
-		__entry->master_idx,
-		__entry->link,
-		__entry->id,
-		__entry->addr,
-		__entry->size
-	)
-);
-
-TRACE_EVENT(fsi_master_write,
-	TP_PROTO(const struct fsi_master *master, int link, int id,
-			uint32_t addr, size_t size, const void *data),
-	TP_ARGS(master, link, id, addr, size, data),
-	TP_STRUCT__entry(
-		__field(int,	master_idx)
-		__field(int,	link)
-		__field(int,	id)
-		__field(__u32,	addr)
-		__field(size_t,	size)
-		__field(__u32,	data)
-	),
-	TP_fast_assign(
-		__entry->master_idx = master->idx;
-		__entry->link = link;
-		__entry->id = id;
-		__entry->addr = addr;
-		__entry->size = size;
+		__entry->size = (int)size;
 		__entry->data = 0;
 		memcpy(&__entry->data, data, size);
+		__entry->read = read;
 	),
-	TP_printk("fsi%d:%02d:%02d %08x[%zu] <= {%*ph}",
-		__entry->master_idx,
-		__entry->link,
-		__entry->id,
-		__entry->addr,
-		__entry->size,
-		(int)__entry->size, &__entry->data
-	)
+	TP_printk("fsi%d:%02d:%02d %s %08x {%*ph}", __entry->master_idx, __entry->link,
+		  __entry->id, __entry->read ? "read" : "write", __entry->addr, __entry->size,
+		  &__entry->data)
 );
 
-TRACE_EVENT(fsi_master_rw_result,
-	TP_PROTO(const struct fsi_master *master, int link, int id,
-			uint32_t addr, size_t size,
-			bool write, const void *data, int ret),
-	TP_ARGS(master, link, id, addr, size, write, data, ret),
+TRACE_EVENT(fsi_master_error,
+	TP_PROTO(int master_idx, int link, int id, uint32_t addr, size_t size, const void *data,
+		 int ret, bool read),
+	TP_ARGS(master_idx, link, id, addr, size, data, ret, read),
 	TP_STRUCT__entry(
-		__field(int,	master_idx)
-		__field(int,	link)
-		__field(int,	id)
-		__field(__u32,	addr)
-		__field(size_t,	size)
-		__field(bool,	write)
-		__field(__u32,	data)
-		__field(int,	ret)
+		__field(int, master_idx)
+		__field(int, link)
+		__field(int, id)
+		__field(uint32_t, addr)
+		__field(int, size)
+		__field(uint32_t, data)
+		__field(int, ret)
+		__field(bool, read)
 	),
 	TP_fast_assign(
-		__entry->master_idx = master->idx;
+		__entry->master_idx = master_idx;
 		__entry->link = link;
 		__entry->id = id;
 		__entry->addr = addr;
-		__entry->size = size;
-		__entry->write = write;
+		__entry->size = (int)size;
 		__entry->data = 0;
-		__entry->ret = ret;
-		if (__entry->write || !__entry->ret)
+		if (!read)
 			memcpy(&__entry->data, data, size);
+		__entry->ret = ret;
+		__entry->read = read;
 	),
-	TP_printk("fsi%d:%02d:%02d %08x[%zu] %s {%*ph} ret %d",
-		__entry->master_idx,
-		__entry->link,
-		__entry->id,
-		__entry->addr,
-		__entry->size,
-		__entry->write ? "<=" : "=>",
-		(int)__entry->size, &__entry->data,
-		__entry->ret
-	)
+	TP_printk("fsi%d:%02d:%02d %s %08x {%*ph} %d", __entry->master_idx, __entry->link,
+		  __entry->id, __entry->read ? "read" : "write", __entry->addr, __entry->size,
+		  &__entry->data, __entry->ret)
 );
 
 TRACE_EVENT(fsi_master_break,
-- 
2.39.3

[PATCH v3 07/40] fsi: core: Add slave error trace

[Eddie James]

Trace out the FSI slave status and interrupt status.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c     |  1 +
 include/trace/events/fsi.h | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index b3029f9c05e4a..93bbdcf50a89a 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -185,6 +185,7 @@ static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
 
 	dev_dbg(&slave->dev, "status: 0x%08x, sisc: 0x%08x\n",
 			be32_to_cpu(stat), be32_to_cpu(irq));
+	trace_fsi_slave_error(slave, be32_to_cpu(irq), be32_to_cpu(stat));
 
 	/* clear interrupts */
 	return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC,
diff --git a/include/trace/events/fsi.h b/include/trace/events/fsi.h
index fed8835f438e5..5509afc98ee8b 100644
--- a/include/trace/events/fsi.h
+++ b/include/trace/events/fsi.h
@@ -115,6 +115,25 @@ TRACE_EVENT(fsi_master_unregister,
 	TP_printk("fsi%d (%d links)", __entry->master_idx, __entry->n_links)
 );
 
+TRACE_EVENT(fsi_slave_error,
+	TP_PROTO(const struct fsi_slave *slave, uint32_t sisc, uint32_t sstat),
+	TP_ARGS(slave, sisc, sstat),
+	TP_STRUCT__entry(
+		__field(int, master_idx)
+		__field(int, link)
+		__field(uint32_t, sisc)
+		__field(uint32_t, sstat)
+	),
+	TP_fast_assign(
+		__entry->master_idx = slave->master->idx;
+		__entry->link = slave->link;
+		__entry->sisc = sisc;
+		__entry->sstat = sstat;
+	),
+	TP_printk("fsi%d:%02d sisc:%08x sstat:%08x", __entry->master_idx, __entry->link,
+		  __entry->sisc, __entry->sstat)
+);
+
 TRACE_EVENT(fsi_slave_init,
 	TP_PROTO(const struct fsi_slave *slave),
 	TP_ARGS(slave),
-- 
2.39.3

[PATCH v3 08/40] fsi: core: Reset errors instead of clearing interrupts

[Eddie James]

The proper way to clear error conditions is to use the SRES
register rather than simple clearing SISC.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c  | 9 +++++----
 drivers/fsi/fsi-slave.h | 6 ++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 93bbdcf50a89a..ce9762d1bd8b0 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -166,7 +166,7 @@ static int fsi_slave_calc_addr(struct fsi_slave *slave, uint32_t *addrp,
 static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
 {
 	struct fsi_master *master = slave->master;
-	__be32 irq, stat;
+	__be32 irq, reset, stat;
 	int rc, link;
 	uint8_t id;
 
@@ -187,9 +187,10 @@ static int fsi_slave_report_and_clear_errors(struct fsi_slave *slave)
 			be32_to_cpu(stat), be32_to_cpu(irq));
 	trace_fsi_slave_error(slave, be32_to_cpu(irq), be32_to_cpu(stat));
 
-	/* clear interrupts */
-	return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SISC,
-			&irq, sizeof(irq));
+	/* reset errors */
+	reset = cpu_to_be32(FSI_SRES_ERRS);
+	return fsi_master_write(master, link, id, FSI_SLAVE_BASE + FSI_SRES, &reset,
+				sizeof(reset));
 }
 
 /* Encode slave local bus echo delay */
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index fabc0b66d5bf3..e9fd4be6f3760 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -24,6 +24,7 @@
 #define FSI_SSI1M		0x1c	/* S  : Set slave interrupt 1 mask */
 #define FSI_SCI1M		0x20	/* C  : Clear slave interrupt 1 mask */
 #define FSI_SLBUS		0x30	/* W  : LBUS Ownership */
+#define FSI_SRES		0x34	/* W  : Reset */
 #define FSI_SRSIC0		0x68	/* C  : Clear remote interrupt condition */
 #define FSI_SRSIC4		0x6c	/* C  : Clear remote interrupt condition */
 #define FSI_SRSIM0		0x70	/* R/W: Remote interrupt mask */
@@ -90,6 +91,11 @@
  */
 #define FSI_SLBUS_FORCE		0x80000000	/* Force LBUS ownership */
 
+/*
+ * SRES fields
+ */
+#define FSI_SRES_ERRS		0x40000000	/* Reset FSI slave errors */
+
 /*
  * LLMODE fields
  */
-- 
2.39.3

[PATCH v3 09/40] fsi: aspeed: Add AST2700 support

[Eddie James]

AST2700 requires a few bits set differently in the OPB retry
counter register, so add some match data and set the register
accordingly.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index f0a19cd451a07..3d15e867237df 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -18,6 +18,10 @@
 
 #include "fsi-master.h"
 
+struct fsi_master_aspeed_data {
+	u32 opb_retry_counter;
+};
+
 struct fsi_master_aspeed {
 	struct fsi_master	master;
 	struct mutex		lock;	/* protect HW access */
@@ -81,6 +85,13 @@ static const u32 fsi_base = 0xa0000000;
 #define XFER_HALFWORD	(BIT(0))
 #define XFER_BYTE	(0)
 
+/* OPB_RETRY_COUNTER */
+#define OPB_RC_FSI_OPB		BIT(19)	/* Access FSI space over OPB, not AHB (AST27xx+) */
+#define OPB_RC_CTRL_OPB		BIT(18)	/* Access controller over OPB, not AHB (AST27xx+) */
+#define OPB_RC_XFER_ACK_EN	BIT(16)	/* Enable OPBx xfer ack bit without mask */
+#define OPB_RC_COUNT		GENMASK(15, 0)	/* Number of retries */
+#define OPB_RC_DEFAULT		0x10
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/fsi_master_aspeed.h>
 
@@ -536,6 +547,8 @@ static int tacoma_cabled_fsi_fixup(struct device *dev)
 
 static int fsi_master_aspeed_probe(struct platform_device *pdev)
 {
+	const struct fsi_master_aspeed_data *md = of_device_get_match_data(&pdev->dev);
+	u32 opb_retry_counter = md ? md->opb_retry_counter : OPB_RC_DEFAULT;
 	struct fsi_master_aspeed *aspeed;
 	int rc, links, reg;
 	__be32 raw;
@@ -579,8 +592,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	writel(OPB1_XFER_ACK_EN | OPB0_XFER_ACK_EN,
 			aspeed->base + OPB_IRQ_MASK);
 
-	/* TODO: determine an appropriate value */
-	writel(0x10, aspeed->base + OPB_RETRY_COUNTER);
+	writel(opb_retry_counter, aspeed->base + OPB_RETRY_COUNTER);
 
 	writel(ctrl_base, aspeed->base + OPB_CTRL_BASE);
 	writel(fsi_base, aspeed->base + OPB_FSI_BASE);
@@ -656,8 +668,23 @@ static int fsi_master_aspeed_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct fsi_master_aspeed_data fsi_master_ast2600_data = {
+	.opb_retry_counter = OPB_RC_DEFAULT,
+};
+
+static const struct fsi_master_aspeed_data fsi_master_ast2700_data = {
+	.opb_retry_counter = OPB_RC_FSI_OPB | OPB_RC_CTRL_OPB | OPB_RC_DEFAULT,
+};
+
 static const struct of_device_id fsi_master_aspeed_match[] = {
-	{ .compatible = "aspeed,ast2600-fsi-master" },
+	{
+		.compatible = "aspeed,ast2600-fsi-master",
+		.data = &fsi_master_ast2600_data,
+	},
+	{
+		.compatible = "aspeed,ast2700-fsi-master",
+		.data = &fsi_master_ast2700_data,
+	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, fsi_master_aspeed_match);
-- 
2.39.3

[PATCH v3 10/40] fsi: core: Add slave spinlock

[Eddie James]

FSI slave operations were not locked, meaning that during slave
error recovery operations, other slave accesses may take place,
resulting in incorrect recovery and additional errors. Make the
slave access and error recovery atomic with a spinlock. Don't
use a mutex for future interrupt handling support.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c  | 7 +++++++
 drivers/fsi/fsi-slave.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index ce9762d1bd8b0..660f89b743235 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -304,6 +304,7 @@ static int fsi_slave_handle_error(struct fsi_slave *slave, bool write,
 int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
 			void *val, size_t size)
 {
+	unsigned long flags;
 	uint8_t id = slave->id;
 	int rc, err_rc, i;
 
@@ -311,6 +312,7 @@ int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
 	if (rc)
 		return rc;
 
+	spin_lock_irqsave(&slave->lock, flags);
 	for (i = 0; i < slave_retries; i++) {
 		rc = fsi_master_read(slave->master, slave->link,
 				id, addr, val, size);
@@ -321,6 +323,7 @@ int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
 		if (err_rc)
 			break;
 	}
+	spin_unlock_irqrestore(&slave->lock, flags);
 
 	return rc;
 }
@@ -329,6 +332,7 @@ EXPORT_SYMBOL_GPL(fsi_slave_read);
 int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
 			const void *val, size_t size)
 {
+	unsigned long flags;
 	uint8_t id = slave->id;
 	int rc, err_rc, i;
 
@@ -336,6 +340,7 @@ int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
 	if (rc)
 		return rc;
 
+	spin_lock_irqsave(&slave->lock, flags);
 	for (i = 0; i < slave_retries; i++) {
 		rc = fsi_master_write(slave->master, slave->link,
 				id, addr, val, size);
@@ -346,6 +351,7 @@ int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
 		if (err_rc)
 			break;
 	}
+	spin_unlock_irqrestore(&slave->lock, flags);
 
 	return rc;
 }
@@ -1007,6 +1013,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	if (!slave)
 		return -ENOMEM;
 
+	spin_lock_init(&slave->lock);
 	dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
 	slave->dev.type = &cfam_type;
 	slave->dev.parent = &master->dev;
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index e9fd4be6f3760..0468ec1c60db2 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -6,6 +6,7 @@
 
 #include <linux/cdev.h>
 #include <linux/device.h>
+#include <linux/spinlock.h>
 
 #define FSI_SLAVE_BASE			0x800
 
@@ -107,6 +108,7 @@ struct fsi_slave {
 	struct device		dev;
 	struct fsi_master	*master;
 	struct cdev		cdev;
+	spinlock_t		lock;	/* atomic access and error recovery */
 	int			cdev_idx;
 	int			id;	/* FSI address */
 	int			link;	/* FSI link# */
-- 
2.39.3

[PATCH v3 11/40] fsi: core: Allow cfam device type aliases

[Eddie James]

Other FSI devices can uses aliases for the device numbering, so
modify the function to get a new minor to allow the cfam type
to use aliases too.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c | 59 +++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 30 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 660f89b743235..36e31eafad3d0 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -884,12 +884,37 @@ static int fsi_adjust_index(int index)
 #endif
 }
 
-static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
-			       dev_t *out_dev, int *out_index)
+static const char *const fsi_dev_type_names[] = {
+	"cfam",
+	"sbefifo",
+	"scom",
+	"occ",
+};
+
+static int __fsi_get_new_minor(struct fsi_slave *slave, struct device_node *np,
+			       enum fsi_dev_type type, dev_t *out_dev, int *out_index)
 {
 	int cid = slave->chip_id;
 	int id;
 
+	if (np && type < 4) {
+		int aid = of_alias_get_id(np, fsi_dev_type_names[type]);
+
+		if (aid >= 0) {
+			/* Use the same scheme as the legacy numbers. */
+			id = (aid << 2) | type;
+			id = ida_alloc_range(&fsi_minor_ida, id, id, GFP_KERNEL);
+			if (id >= 0) {
+				*out_index = aid;
+				*out_dev = fsi_base_dev + id;
+				return 0;
+			}
+
+			if (id != -ENOSPC)
+				return id;
+		}
+	}
+
 	/* Check if we qualify for legacy numbering */
 	if (cid >= 0 && cid < 16 && type < 4) {
 		/*
@@ -918,36 +943,10 @@ static int __fsi_get_new_minor(struct fsi_slave *slave, enum fsi_dev_type type,
 	return 0;
 }
 
-static const char *const fsi_dev_type_names[] = {
-	"cfam",
-	"sbefifo",
-	"scom",
-	"occ",
-};
-
 int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
 		      dev_t *out_dev, int *out_index)
 {
-	if (fdev->dev.of_node) {
-		int aid = of_alias_get_id(fdev->dev.of_node, fsi_dev_type_names[type]);
-
-		if (aid >= 0) {
-			/* Use the same scheme as the legacy numbers. */
-			int id = (aid << 2) | type;
-
-			id = ida_alloc_range(&fsi_minor_ida, id, id, GFP_KERNEL);
-			if (id >= 0) {
-				*out_index = aid;
-				*out_dev = fsi_base_dev + id;
-				return 0;
-			}
-
-			if (id != -ENOSPC)
-				return id;
-		}
-	}
-
-	return __fsi_get_new_minor(fdev->slave, type, out_dev, out_index);
+	return __fsi_get_new_minor(fdev->slave, fdev->dev.of_node, type, out_dev, out_index);
 }
 EXPORT_SYMBOL_GPL(fsi_get_new_minor);
 
@@ -1059,7 +1058,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 	}
 
 	/* Allocate a minor in the FSI space */
-	rc = __fsi_get_new_minor(slave, fsi_dev_cfam, &slave->dev.devt,
+	rc = __fsi_get_new_minor(slave, slave->dev.of_node, fsi_dev_cfam, &slave->dev.devt,
 				 &slave->cdev_idx);
 	if (rc)
 		goto err_free;
-- 
2.39.3

[PATCH v3 12/40] fsi: core: Add common regmap master functions

[Eddie James]

For hardware FSI masters (Aspeed and hub at the moment), the
initialization, link enable, and error recovery procedures are
common. Add a regmap pointer to the master structure so that master
drivers can let the common code handle these procedures.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Zero the regmap_config structure in the common FSI initialization
   function

 drivers/fsi/Kconfig        |   2 +
 drivers/fsi/fsi-core.c     | 162 ++++++++++++++++++++++++++++++++++++-
 drivers/fsi/fsi-master.h   |  16 ++++
 include/trace/events/fsi.h |  17 ++++
 4 files changed, 195 insertions(+), 2 deletions(-)

diff --git a/drivers/fsi/Kconfig b/drivers/fsi/Kconfig
index 79a31593618a6..a6760870538d3 100644
--- a/drivers/fsi/Kconfig
+++ b/drivers/fsi/Kconfig
@@ -7,6 +7,7 @@ menuconfig FSI
 	tristate "FSI support"
 	depends on OF
 	select CRC4
+	select REGMAP
 	help
 	  FSI - the FRU Support Interface - is a simple bus for low-level
 	  access to POWER-based hardware.
@@ -37,6 +38,7 @@ config FSI_MASTER_GPIO
 
 config FSI_MASTER_HUB
 	tristate "FSI hub master"
+	select REGMAP_FSI
 	help
 	This option enables a FSI hub master driver.  Hub is a type of FSI
 	master that is connected to the upstream master via a slave.  Hubs
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 36e31eafad3d0..bfb147de90efc 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
 #include <linux/cdev.h>
@@ -1155,18 +1156,50 @@ static int fsi_master_write(struct fsi_master *master, int link,
 	return rc;
 }
 
+int fsi_master_link_enable(struct fsi_master *master, int link, bool enable)
+{
+	u32 msiep = 0x80000000 >> (4 * (link % 8));
+	u32 menp = 0x80000000 >> (link % 32);
+	int enable_idx = 4 * (link / 32);
+	int irq_idx = 4 * (link / 8);
+	int rc;
+
+	if (enable) {
+		rc = regmap_write(master->map, FSI_MSENP0 + enable_idx, menp);
+		if (rc)
+			return rc;
+
+		mdelay(FSI_LINK_ENABLE_SETUP_TIME);
+
+		rc = regmap_write(master->map, FSI_MSSIEP0 + irq_idx, msiep);
+	} else {
+		rc = regmap_write(master->map, FSI_MCSIEP0 + irq_idx, msiep);
+		if (rc)
+			return rc;
+
+		rc = regmap_write(master->map, FSI_MCENP0 + enable_idx, menp);
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(fsi_master_link_enable);
+
 static int fsi_master_link_disable(struct fsi_master *master, int link)
 {
 	if (master->link_enable)
 		return master->link_enable(master, link, false);
+	else if (master->map)
+		return fsi_master_link_enable(master, link, false);
 
 	return 0;
 }
 
-static int fsi_master_link_enable(struct fsi_master *master, int link)
+static int _fsi_master_link_enable(struct fsi_master *master, int link)
 {
 	if (master->link_enable)
 		return master->link_enable(master, link, true);
+	else if (master->map)
+		return fsi_master_link_enable(master, link, true);
 
 	return 0;
 }
@@ -1194,7 +1227,7 @@ static int fsi_master_scan(struct fsi_master *master)
 
 	trace_fsi_master_scan(master, true);
 	for (link = 0; link < master->n_links; link++) {
-		rc = fsi_master_link_enable(master, link);
+		rc = _fsi_master_link_enable(master, link);
 		if (rc) {
 			dev_dbg(&master->dev,
 				"enable link %d failed: %d\n", link, rc);
@@ -1291,6 +1324,131 @@ static struct class fsi_master_class = {
 	.dev_groups = master_groups,
 };
 
+void fsi_master_error(struct fsi_master *master, int link)
+{
+	u32 bits = FSI_MMODE_EIP | FSI_MMODE_RELA;
+	bool mmode = master->mmode & bits;
+
+	if (trace_fsi_master_error_regs_enabled()) {
+		unsigned int mesrb = 0xffffffff;
+		unsigned int mstap = 0xffffffff;
+
+		regmap_read(master->map, FSI_MESRB0, &mesrb);
+		regmap_read(master->map, FSI_MSTAP0 + (link * 4), &mstap);
+
+		trace_fsi_master_error_regs(master->idx, mesrb, mstap);
+	}
+
+	if (mmode)
+		regmap_write(master->map, FSI_MMODE, master->mmode & ~bits);
+
+	regmap_write(master->map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER);
+
+	if (mmode)
+		regmap_write(master->map, FSI_MMODE, master->mmode);
+}
+EXPORT_SYMBOL_GPL(fsi_master_error);
+
+static inline u32 fsi_mmode_crs0(u32 x)
+{
+	return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
+}
+
+static inline u32 fsi_mmode_crs1(u32 x)
+{
+	return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
+}
+
+int fsi_master_init(struct fsi_master *master, unsigned long parent_clock_frequency)
+{
+	unsigned int mlevp;
+	unsigned int maeb;
+	int div = 1;
+	int rc;
+
+	if (parent_clock_frequency) {
+		u32 clock_frequency;
+
+		if (device_property_read_u32(&master->dev, "clock-frequency", &clock_frequency) ||
+		    !clock_frequency)
+			clock_frequency = parent_clock_frequency;
+
+		div = DIV_ROUND_UP(parent_clock_frequency, clock_frequency);
+		master->clock_frequency = parent_clock_frequency / div;
+	}
+
+	rc = regmap_write(master->map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER |
+			  FSI_MRESP_RST_ALL_LINK | FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MECTRL, FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
+	if (rc)
+		return rc;
+
+	master->mmode = FSI_MMODE_ECRC | FSI_MMODE_EPC | fsi_mmode_crs0(div) |
+		fsi_mmode_crs1(div) | FSI_MMODE_P8_TO_LSB;
+	rc = regmap_write(master->map, FSI_MMODE, master->mmode);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MDLYR, 0xffff0000);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MSENP0, 0xffffffff);
+	if (rc)
+		return rc;
+
+	mdelay(FSI_LINK_ENABLE_SETUP_TIME);
+
+	rc = regmap_write(master->map, FSI_MCENP0, 0xffffffff);
+	if (rc)
+		return rc;
+
+	rc = regmap_read(master->map, FSI_MAEB, &maeb);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER |
+			  FSI_MRESP_RST_ALL_LINK);
+	if (rc)
+		return rc;
+
+	rc = regmap_read(master->map, FSI_MLEVP0, &mlevp);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MRESB0, FSI_MRESB_RST_GEN);
+	if (rc)
+		return rc;
+
+	rc = regmap_write(master->map, FSI_MRESB0, FSI_MRESB_RST_ERR);
+	if (rc)
+		return rc;
+
+	if (master->flags & FSI_MASTER_FLAG_INTERRUPT)
+		master->mmode |= FSI_MMODE_EIP;
+	if (master->flags & FSI_MASTER_FLAG_RELA)
+		master->mmode |= FSI_MMODE_RELA;
+	return regmap_write(master->map, FSI_MMODE, master->mmode);
+}
+EXPORT_SYMBOL_GPL(fsi_master_init);
+
+void fsi_master_regmap_config(struct regmap_config *config)
+{
+	memset(config, 0, sizeof(*config));
+
+	config->reg_bits = 32;
+	config->val_bits = 32;
+	config->disable_locking = true;	// master driver will lock
+	config->fast_io = true;
+	config->cache_type = REGCACHE_NONE;
+	config->val_format_endian = REGMAP_ENDIAN_NATIVE;
+	config->can_sleep = false;
+}
+EXPORT_SYMBOL_GPL(fsi_master_regmap_config);
+
 int fsi_master_register(struct fsi_master *master)
 {
 	int rc;
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index ff23983ea84c8..8ea2f69ec4922 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -27,6 +27,9 @@
 #define FSI_MLEVP0		0x18		/* R: plug detect */
 #define FSI_MSENP0		0x18		/* S: Set enable */
 #define FSI_MCENP0		0x20		/* C: Clear enable */
+#define FSI_MSIEP0		0x30		/* R/W: interrupt enable */
+#define FSI_MSSIEP0		0x50		/* S: Set interrupt enable */
+#define FSI_MCSIEP0		0x70		/* C: Clear interrupt enable */
 #define FSI_MAEB		0x70		/* R: Error address */
 #define FSI_MVER		0x74		/* R: master version/type */
 #define FSI_MSTAP0		0xd0		/* R: Port status */
@@ -108,10 +111,16 @@
 
 /* Misc */
 #define	FSI_CRC_SIZE		4
+#define FSI_LINK_ENABLE_SETUP_TIME	10	/* in mS */
 
 /* fsi-master definition and flags */
 #define FSI_MASTER_FLAG_SWCLOCK		0x1
 #define FSI_MASTER_FLAG_NO_BREAK_SID	0x2
+#define FSI_MASTER_FLAG_INTERRUPT	0x4
+#define FSI_MASTER_FLAG_RELA		0x8
+
+struct regmap;
+struct regmap_config;
 
 /*
  * Structures and function prototypes
@@ -121,6 +130,8 @@
 
 struct fsi_master {
 	struct device	dev;
+	struct regmap	*map;
+	u32		mmode;
 	unsigned long	clock_frequency;
 	int		idx;
 	int		n_links;
@@ -140,6 +151,11 @@ struct fsi_master {
 
 #define to_fsi_master(d) container_of(d, struct fsi_master, dev)
 
+void fsi_master_error(struct fsi_master *master, int link);
+int fsi_master_init(struct fsi_master *master, unsigned long parent_clock_frequency);
+int fsi_master_link_enable(struct fsi_master *master, int link, bool enable);
+void fsi_master_regmap_config(struct regmap_config *config);
+
 /**
  * fsi_master registration & lifetime: the fsi_master_register() and
  * fsi_master_unregister() functions will take ownership of the master, and
diff --git a/include/trace/events/fsi.h b/include/trace/events/fsi.h
index 5509afc98ee8b..da977d59e163e 100644
--- a/include/trace/events/fsi.h
+++ b/include/trace/events/fsi.h
@@ -67,6 +67,23 @@ TRACE_EVENT(fsi_master_error,
 		  &__entry->data, __entry->ret)
 );
 
+TRACE_EVENT(fsi_master_error_regs,
+	TP_PROTO(int master_idx, uint32_t mesrb, uint32_t mstap),
+	TP_ARGS(master_idx, mesrb, mstap),
+	TP_STRUCT__entry(
+		__field(int, master_idx)
+		__field(uint32_t, mesrb)
+		__field(uint32_t, mstap)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master_idx;
+		__entry->mesrb = mesrb;
+		__entry->mstap = mstap;
+	),
+	TP_printk("fsi%d mesrb:%08x mstap:%08x", __entry->master_idx, __entry->mesrb,
+		  __entry->mstap)
+);
+
 TRACE_EVENT(fsi_master_break,
 	TP_PROTO(const struct fsi_master *master, int link),
 	TP_ARGS(master, link),
-- 
2.39.3

[PATCH v3 13/40] fsi: core: Disable relative addressing during scan

[Eddie James]

Relative addressing is not allowed during slave ID initialization, so
turn it off during the FSI scan procedure.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index bfb147de90efc..8b402149acbe9 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1223,8 +1223,20 @@ static int fsi_master_break(struct fsi_master *master, int link)
 
 static int fsi_master_scan(struct fsi_master *master)
 {
+	bool set_mmode = false;
 	int link, rc;
 
+	/* relative addressing is not allowed during slave ID initialization */
+	if (master->map && (master->flags & FSI_MASTER_FLAG_RELA)) {
+		u32 mmode = master->mmode & ~FSI_MMODE_RELA;
+
+		rc = regmap_write(master->map, FSI_MMODE, mmode);
+		if (rc)
+			return rc;
+
+		set_mmode = true;
+	}
+
 	trace_fsi_master_scan(master, true);
 	for (link = 0; link < master->n_links; link++) {
 		rc = _fsi_master_link_enable(master, link);
@@ -1246,6 +1258,12 @@ static int fsi_master_scan(struct fsi_master *master)
 			fsi_master_link_disable(master, link);
 	}
 
+	if (set_mmode) {
+		rc = regmap_write(master->map, FSI_MMODE, master->mmode);
+		if (rc)
+			return rc;
+	}
+
 	return 0;
 }
 
-- 
2.39.3

[PATCH v3 14/40] fsi: hub: Use common initialization and link enable

[Eddie James]

Set up an FSI regmap for the hub master to use the new common
master initialization and link enable procedures.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-hub.c | 142 ++++++-----------------------------
 1 file changed, 23 insertions(+), 119 deletions(-)

diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index eea8649fee74d..91ad6b7728fa2 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -9,6 +9,7 @@
 #include <linux/fsi.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/regmap.h>
 #include <linux/slab.h>
 
 #include "fsi-master.h"
@@ -16,8 +17,6 @@
 
 #define FSI_ENGID_HUB_MASTER		0x1c
 
-#define FSI_LINK_ENABLE_SETUP_TIME	10	/* in mS */
-
 /*
  * FSI hub master support
  *
@@ -78,134 +77,33 @@ static int hub_master_break(struct fsi_master *master, int link)
 	return hub_master_write(master, link, 0, addr, &cmd, sizeof(cmd));
 }
 
-static int hub_master_link_enable(struct fsi_master *master, int link,
-				  bool enable)
-{
-	struct fsi_master_hub *hub = to_fsi_master_hub(master);
-	int idx, bit;
-	__be32 reg;
-	int rc;
-
-	idx = link / 32;
-	bit = link % 32;
-
-	reg = cpu_to_be32(0x80000000 >> bit);
-
-	if (!enable)
-		return fsi_device_write(hub->upstream, FSI_MCENP0 + (4 * idx),
-					&reg, 4);
-
-	rc = fsi_device_write(hub->upstream, FSI_MSENP0 + (4 * idx), &reg, 4);
-	if (rc)
-		return rc;
-
-	mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-
-	return 0;
-}
-
 static void hub_master_release(struct device *dev)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(to_fsi_master(dev));
 
+	regmap_exit(hub->master.map);
 	kfree(hub);
 }
 
-/* mmode encoders */
-static inline u32 fsi_mmode_crs0(u32 x)
-{
-	return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
-}
-
-static inline u32 fsi_mmode_crs1(u32 x)
-{
-	return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
-}
-
-static int hub_master_init(struct fsi_master_hub *hub)
-{
-	struct fsi_device *dev = hub->upstream;
-	__be32 reg;
-	int rc;
-
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
-			| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
-	rc = fsi_device_write(dev, FSI_MRESP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	/* Initialize the MFSI (hub master) engine */
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
-			| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
-	rc = fsi_device_write(dev, FSI_MRESP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
-	rc = fsi_device_write(dev, FSI_MECTRL, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(FSI_MMODE_EIP | FSI_MMODE_ECRC | FSI_MMODE_EPC
-			| fsi_mmode_crs0(1) | fsi_mmode_crs1(1)
-			| FSI_MMODE_P8_TO_LSB);
-	rc = fsi_device_write(dev, FSI_MMODE, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(0xffff0000);
-	rc = fsi_device_write(dev, FSI_MDLYR, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(~0);
-	rc = fsi_device_write(dev, FSI_MSENP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	/* Leave enabled long enough for master logic to set up */
-	mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-
-	rc = fsi_device_write(dev, FSI_MCENP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	rc = fsi_device_read(dev, FSI_MAEB, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK);
-	rc = fsi_device_write(dev, FSI_MRESP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	rc = fsi_device_read(dev, FSI_MLEVP0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	/* Reset the master bridge */
-	reg = cpu_to_be32(FSI_MRESB_RST_GEN);
-	rc = fsi_device_write(dev, FSI_MRESB0, &reg, sizeof(reg));
-	if (rc)
-		return rc;
-
-	reg = cpu_to_be32(FSI_MRESB_RST_ERR);
-	return fsi_device_write(dev, FSI_MRESB0, &reg, sizeof(reg));
-}
-
 static int hub_master_probe(struct device *dev)
 {
+	struct regmap_config hub_master_regmap_config;
 	struct fsi_device *fsi_dev = to_fsi_dev(dev);
 	struct fsi_master_hub *hub;
+	struct regmap *map;
 	uint32_t reg, links;
-	__be32 __reg;
 	int rc;
 
-	rc = fsi_device_read(fsi_dev, FSI_MVER, &__reg, sizeof(__reg));
+	fsi_master_regmap_config(&hub_master_regmap_config);
+	hub_master_regmap_config.reg_base = fsi_dev->addr;
+	map = regmap_init_fsi(fsi_dev, &hub_master_regmap_config);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	rc = regmap_read(map, FSI_MVER, &reg);
 	if (rc)
-		return rc;
+		goto err_regmap;
 
-	reg = be32_to_cpu(__reg);
 	links = (reg >> 8) & 0xff;
 	dev_dbg(dev, "hub version %08x (%d links)\n", reg, links);
 
@@ -213,7 +111,7 @@ static int hub_master_probe(struct device *dev)
 			FSI_HUB_LINK_SIZE * links);
 	if (rc) {
 		dev_err(dev, "can't claim slave address range for links");
-		return rc;
+		goto err_regmap;
 	}
 
 	hub = kzalloc(sizeof(*hub), GFP_KERNEL);
@@ -229,22 +127,24 @@ static int hub_master_probe(struct device *dev)
 	hub->master.dev.parent = dev;
 	hub->master.dev.release = hub_master_release;
 	hub->master.dev.of_node = of_node_get(dev_of_node(dev));
+	hub->master.map = map;
 
 	hub->master.idx = fsi_dev->slave->link + 1;
 	hub->master.n_links = links;
-	hub->master.flags = FSI_MASTER_FLAG_NO_BREAK_SID;
+	hub->master.flags = FSI_MASTER_FLAG_NO_BREAK_SID | FSI_MASTER_FLAG_INTERRUPT;
 	hub->master.read = hub_master_read;
 	hub->master.write = hub_master_write;
 	hub->master.send_break = hub_master_break;
-	hub->master.link_enable = hub_master_link_enable;
 
 	dev_set_drvdata(dev, hub);
 
-	hub_master_init(hub);
+	rc = fsi_master_init(&hub->master, fsi_dev->slave->master->clock_frequency);
+	if (rc)
+		goto err_free;
 
 	rc = fsi_master_register(&hub->master);
 	if (rc)
-		goto err_release;
+		goto err_free;
 
 	/* At this point, fsi_master_register performs the device_initialize(),
 	 * and holds the sole reference on master.dev. This means the device
@@ -256,9 +156,13 @@ static int hub_master_probe(struct device *dev)
 	get_device(&hub->master.dev);
 	return 0;
 
+err_free:
+	kfree(hub);
 err_release:
 	fsi_slave_release_range(fsi_dev->slave, FSI_HUB_LINK_OFFSET,
 			FSI_HUB_LINK_SIZE * links);
+err_regmap:
+	regmap_exit(map);
 	return rc;
 }
 
-- 
2.39.3

[PATCH v3 15/40] fsi: aspeed: Use common initialization and link enable

[Eddie James]

Create a regmap for accessing the master registers over OPB
to use the new common master initialization and link enable procedures.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Add AST2700 direct AHB access of master registers

 drivers/fsi/fsi-master-aspeed.c | 173 +++++++++++++-------------------
 1 file changed, 68 insertions(+), 105 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 3d15e867237df..a67f185bb8814 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -27,6 +27,7 @@ struct fsi_master_aspeed {
 	struct mutex		lock;	/* protect HW access */
 	struct device		*dev;
 	void __iomem		*base;
+	void __iomem		*ctrl;
 	struct clk		*clk;
 	struct gpio_desc	*cfam_reset_gpio;
 };
@@ -95,14 +96,6 @@ static const u32 fsi_base = 0xa0000000;
 #define CREATE_TRACE_POINTS
 #include <trace/events/fsi_master_aspeed.h>
 
-#define FSI_LINK_ENABLE_SETUP_TIME	10	/* in mS */
-
-/* Run the bus at maximum speed by default */
-#define FSI_DIVISOR_DEFAULT            1
-#define FSI_DIVISOR_CABLED             2
-static u16 aspeed_fsi_divisor = FSI_DIVISOR_DEFAULT;
-module_param_named(bus_div,aspeed_fsi_divisor, ushort, 0);
-
 #define OPB_POLL_TIMEOUT		500
 
 static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
@@ -333,35 +326,6 @@ static int aspeed_master_write(struct fsi_master *master, int link,
 	return ret;
 }
 
-static int aspeed_master_link_enable(struct fsi_master *master, int link,
-				     bool enable)
-{
-	struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
-	int idx, bit, ret;
-	__be32 reg;
-
-	idx = link / 32;
-	bit = link % 32;
-
-	reg = cpu_to_be32(0x80000000 >> bit);
-
-	mutex_lock(&aspeed->lock);
-
-	if (!enable) {
-		ret = opb_writel(aspeed, ctrl_base + FSI_MCENP0 + (4 * idx), reg);
-		goto done;
-	}
-
-	ret = opb_writel(aspeed, ctrl_base + FSI_MSENP0 + (4 * idx), reg);
-	if (ret)
-		goto done;
-
-	mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-done:
-	mutex_unlock(&aspeed->lock);
-	return ret;
-}
-
 static int aspeed_master_term(struct fsi_master *master, int link, uint8_t id)
 {
 	uint32_t addr;
@@ -389,72 +353,54 @@ static void aspeed_master_release(struct device *dev)
 	struct fsi_master_aspeed *aspeed =
 		to_fsi_master_aspeed(to_fsi_master(dev));
 
+	regmap_exit(aspeed->master.map);
 	kfree(aspeed);
 }
 
-/* mmode encoders */
-static inline u32 fsi_mmode_crs0(u32 x)
+static int regmap_aspeed_opb_read(void *context, unsigned int reg, unsigned int *val)
 {
-	return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
-}
+	__be32 v;
+	int ret;
 
-static inline u32 fsi_mmode_crs1(u32 x)
-{
-	return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
+	ret = opb_readl(context, ctrl_base + reg, &v);
+	if (ret)
+		return ret;
+
+	*val = be32_to_cpu(v);
+	return 0;
 }
 
-static int aspeed_master_init(struct fsi_master_aspeed *aspeed)
+static int regmap_aspeed_opb_write(void *context, unsigned int reg, unsigned int val)
 {
-	__be32 reg;
-
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
-			| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
-	opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
-
-	/* Initialize the MFSI (hub master) engine */
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
-			| FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
-	opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
-
-	reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
-	opb_writel(aspeed, ctrl_base + FSI_MECTRL, reg);
-
-	reg = cpu_to_be32(FSI_MMODE_ECRC | FSI_MMODE_EPC | FSI_MMODE_RELA
-			| fsi_mmode_crs0(aspeed_fsi_divisor)
-			| fsi_mmode_crs1(aspeed_fsi_divisor)
-			| FSI_MMODE_P8_TO_LSB);
-	dev_info(aspeed->dev, "mmode set to %08x (divisor %d)\n",
-			be32_to_cpu(reg), aspeed_fsi_divisor);
-	opb_writel(aspeed, ctrl_base + FSI_MMODE, reg);
-
-	reg = cpu_to_be32(0xffff0000);
-	opb_writel(aspeed, ctrl_base + FSI_MDLYR, reg);
-
-	reg = cpu_to_be32(~0);
-	opb_writel(aspeed, ctrl_base + FSI_MSENP0, reg);
-
-	/* Leave enabled long enough for master logic to set up */
-	mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-
-	opb_writel(aspeed, ctrl_base + FSI_MCENP0, reg);
-
-	opb_readl(aspeed, ctrl_base + FSI_MAEB, NULL);
+	return opb_writel(context, ctrl_base + reg, cpu_to_be32(val));
+}
 
-	reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK);
-	opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
+static const struct regmap_bus regmap_aspeed_opb = {
+	.reg_write = regmap_aspeed_opb_write,
+	.reg_read = regmap_aspeed_opb_read,
+};
 
-	opb_readl(aspeed, ctrl_base + FSI_MLEVP0, NULL);
+static int regmap_ast2700_read(void *context, unsigned int reg, unsigned int *val)
+{
+	struct fsi_master_aspeed *aspeed = context;
 
-	/* Reset the master bridge */
-	reg = cpu_to_be32(FSI_MRESB_RST_GEN);
-	opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
+	*val = readl(aspeed->ctrl + reg);
+	return 0;
+}
 
-	reg = cpu_to_be32(FSI_MRESB_RST_ERR);
-	opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
+static int regmap_ast2700_write(void *context, unsigned int reg, unsigned int val)
+{
+	struct fsi_master_aspeed *aspeed = context;
 
+	writel(val, aspeed->ctrl + reg);
 	return 0;
 }
 
+static const struct regmap_bus regmap_ast2700 = {
+	.reg_write = regmap_ast2700_write,
+	.reg_read = regmap_ast2700_read,
+};
+
 static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *attr,
 				const char *buf, size_t count)
 {
@@ -466,7 +412,7 @@ static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *att
 	usleep_range(900, 1000);
 	gpiod_set_value(aspeed->cfam_reset_gpio, 0);
 	usleep_range(900, 1000);
-	opb_writel(aspeed, ctrl_base + FSI_MRESP0, cpu_to_be32(FSI_MRESP_RST_ALL_MASTER));
+	regmap_write(aspeed->master.map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER);
 	mutex_unlock(&aspeed->lock);
 	trace_fsi_master_aspeed_cfam_reset(false);
 
@@ -526,14 +472,6 @@ static int tacoma_cabled_fsi_fixup(struct device *dev)
 
 	/* If the routing GPIO is high we should set the mux to low. */
 	if (gpio) {
-		/*
-		 * Cable signal integrity means we should run the bus
-		 * slightly slower. Do not override if a kernel param
-		 * has already overridden.
-		 */
-		if (aspeed_fsi_divisor == FSI_DIVISOR_DEFAULT)
-			aspeed_fsi_divisor = FSI_DIVISOR_CABLED;
-
 		gpiod_direction_output(mux_gpio, 0);
 		dev_info(dev, "FSI configured for external cable\n");
 	} else {
@@ -549,9 +487,13 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 {
 	const struct fsi_master_aspeed_data *md = of_device_get_match_data(&pdev->dev);
 	u32 opb_retry_counter = md ? md->opb_retry_counter : OPB_RC_DEFAULT;
+	const struct regmap_bus *bus = &regmap_aspeed_opb;
+	struct regmap_config aspeed_master_regmap_config;
 	struct fsi_master_aspeed *aspeed;
-	int rc, links, reg;
-	__be32 raw;
+	u32 opb_ctrl_base = ctrl_base;
+	struct resource *res;
+	unsigned int reg;
+	int rc, links;
 
 	rc = tacoma_cabled_fsi_fixup(&pdev->dev);
 	if (rc) {
@@ -571,6 +513,17 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 		goto err_free_aspeed;
 	}
 
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
+	if (res) {
+		aspeed->ctrl = devm_ioremap_resource(&pdev->dev, res);
+		if (!IS_ERR(aspeed->ctrl)) {
+			/* Access FSI controller over AHB */
+			opb_ctrl_base = res->start;
+			opb_retry_counter &= ~OPB_RC_CTRL_OPB;
+			bus = &regmap_ast2700;
+		}
+	}
+
 	aspeed->clk = devm_clk_get(aspeed->dev, NULL);
 	if (IS_ERR(aspeed->clk)) {
 		dev_err(aspeed->dev, "couldn't get clock\n");
@@ -594,7 +547,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 
 	writel(opb_retry_counter, aspeed->base + OPB_RETRY_COUNTER);
 
-	writel(ctrl_base, aspeed->base + OPB_CTRL_BASE);
+	writel(opb_ctrl_base, aspeed->base + OPB_CTRL_BASE);
 	writel(fsi_base, aspeed->base + OPB_FSI_BASE);
 
 	/* Set read data order */
@@ -611,13 +564,19 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	 */
 	writel(0x1, aspeed->base + OPB0_SELECT);
 
-	rc = opb_readl(aspeed, ctrl_base + FSI_MVER, &raw);
+	fsi_master_regmap_config(&aspeed_master_regmap_config);
+	aspeed->master.map = regmap_init(&pdev->dev, bus, aspeed, &aspeed_master_regmap_config);
+	if (IS_ERR(aspeed->master.map)) {
+		rc = PTR_ERR(aspeed->master.map);
+		goto err_release;
+	}
+
+	rc = regmap_read(aspeed->master.map, FSI_MVER, &reg);
 	if (rc) {
 		dev_err(&pdev->dev, "failed to read hub version\n");
-		goto err_release;
+		goto err_regmap;
 	}
 
-	reg = be32_to_cpu(raw);
 	links = (reg >> 8) & 0xff;
 	dev_info(&pdev->dev, "hub version %08x (%d links)\n", reg, links);
 
@@ -626,20 +585,22 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	aspeed->master.dev.of_node = of_node_get(dev_of_node(&pdev->dev));
 
 	aspeed->master.n_links = links;
+	aspeed->master.flags = FSI_MASTER_FLAG_RELA;
 	aspeed->master.read = aspeed_master_read;
 	aspeed->master.write = aspeed_master_write;
 	aspeed->master.send_break = aspeed_master_break;
 	aspeed->master.term = aspeed_master_term;
-	aspeed->master.link_enable = aspeed_master_link_enable;
 
 	dev_set_drvdata(&pdev->dev, aspeed);
 
 	mutex_init(&aspeed->lock);
-	aspeed_master_init(aspeed);
+	rc = fsi_master_init(&aspeed->master, clk_get_rate(aspeed->clk));
+	if (rc)
+		goto err_regmap;
 
 	rc = fsi_master_register(&aspeed->master);
 	if (rc)
-		goto err_release;
+		goto err_regmap;
 
 	/* At this point, fsi_master_register performs the device_initialize(),
 	 * and holds the sole reference on master.dev. This means the device
@@ -651,6 +612,8 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	get_device(&aspeed->master.dev);
 	return 0;
 
+err_regmap:
+	regmap_exit(aspeed->master.map);
 err_release:
 	clk_disable_unprepare(aspeed->clk);
 err_free_aspeed:
-- 
2.39.3

[PATCH v3 16/40] fsi: aspeed: Remove cfam reset sysfs file in error path and remove

[Eddie James]

This fixes a duplicate sysfs warning on device re-probe.

Fixes: 4a851d714ead ("fsi: aspeed: Support CFAM reset GPIO")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index a67f185bb8814..29932037c9866 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -437,6 +437,7 @@ static int setup_cfam_reset(struct fsi_master_aspeed *aspeed)
 
 	rc = device_create_file(dev, &dev_attr_cfam_reset);
 	if (rc) {
+		aspeed->cfam_reset_gpio = NULL;
 		devm_gpiod_put(dev, gpio);
 		return rc;
 	}
@@ -615,6 +616,9 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 err_regmap:
 	regmap_exit(aspeed->master.map);
 err_release:
+	if (aspeed->cfam_reset_gpio)
+		device_remove_file(aspeed->dev, &dev_attr_cfam_reset);
+
 	clk_disable_unprepare(aspeed->clk);
 err_free_aspeed:
 	kfree(aspeed);
@@ -625,6 +629,9 @@ static int fsi_master_aspeed_remove(struct platform_device *pdev)
 {
 	struct fsi_master_aspeed *aspeed = platform_get_drvdata(pdev);
 
+	if (aspeed->cfam_reset_gpio)
+		device_remove_file(aspeed->dev, &dev_attr_cfam_reset);
+
 	fsi_master_unregister(&aspeed->master);
 	clk_disable_unprepare(aspeed->clk);
 
-- 
2.39.3

[PATCH v3 17/40] fsi: aspeed: Refactor trace functions

[Eddie James]

Remove the opb error trace, add a timeout trace, and combine the
read/write traces.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c          | 29 +++------
 include/trace/events/fsi_master_aspeed.h | 80 ++++++++----------------
 2 files changed, 34 insertions(+), 75 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 29932037c9866..04aa5cb9b6fad 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -122,16 +122,17 @@ static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
 
 	status = readl(base + OPB0_STATUS);
 
-	trace_fsi_master_aspeed_opb_write(addr, val, transfer_size, status, reg);
-
 	/* Return error when poll timed out */
-	if (ret)
+	if (ret) {
+		trace_fsi_master_aspeed_timeout(reg, status, false);
 		return ret;
+	}
 
 	/* Command failed, master will reset */
 	if (status & STATUS_ERR_ACK)
 		return -EIO;
 
+	trace_fsi_master_aspeed_opb_xfer(addr, transfer_size + 1, val, false);
 	return 0;
 }
 
@@ -175,13 +176,11 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 
 	result = readl(base + OPB0_FSI_DATA_R);
 
-	trace_fsi_master_aspeed_opb_read(addr, transfer_size, result,
-			readl(base + OPB0_STATUS),
-			reg);
-
 	/* Return error when poll timed out */
-	if (ret)
+	if (ret) {
+		trace_fsi_master_aspeed_timeout(reg, status, true);
 		return ret;
+	}
 
 	/* Command failed, master will reset */
 	if (status & STATUS_ERR_ACK)
@@ -204,6 +203,7 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 
 	}
 
+	trace_fsi_master_aspeed_opb_xfer(addr, transfer_size + 1, result, true);
 	return 0;
 }
 
@@ -226,19 +226,6 @@ static int check_errors(struct fsi_master_aspeed *aspeed, int err)
 {
 	int ret;
 
-	if (trace_fsi_master_aspeed_opb_error_enabled()) {
-		__be32 mresp0, mstap0, mesrb0;
-
-		opb_readl(aspeed, ctrl_base + FSI_MRESP0, &mresp0);
-		opb_readl(aspeed, ctrl_base + FSI_MSTAP0, &mstap0);
-		opb_readl(aspeed, ctrl_base + FSI_MESRB0, &mesrb0);
-
-		trace_fsi_master_aspeed_opb_error(
-				be32_to_cpu(mresp0),
-				be32_to_cpu(mstap0),
-				be32_to_cpu(mesrb0));
-	}
-
 	if (err == -EIO) {
 		/* Check MAEB (0x70) ? */
 
diff --git a/include/trace/events/fsi_master_aspeed.h b/include/trace/events/fsi_master_aspeed.h
index 0fff873775f19..7eeecbfec7f09 100644
--- a/include/trace/events/fsi_master_aspeed.h
+++ b/include/trace/events/fsi_master_aspeed.h
@@ -8,69 +8,41 @@
 
 #include <linux/tracepoint.h>
 
-TRACE_EVENT(fsi_master_aspeed_opb_read,
-	TP_PROTO(uint32_t addr, size_t size, uint32_t result, uint32_t status, uint32_t irq_status),
-	TP_ARGS(addr, size, result, status, irq_status),
+TRACE_EVENT(fsi_master_aspeed_opb_xfer,
+	TP_PROTO(uint32_t addr, uint32_t size, uint32_t data, bool read),
+	TP_ARGS(addr, size, data, read),
 	TP_STRUCT__entry(
-		__field(uint32_t,  addr)
-		__field(size_t,    size)
-		__field(uint32_t,  result)
-		__field(uint32_t,  status)
-		__field(uint32_t,  irq_status)
-		),
+		__field(uint32_t, addr)
+		__field(uint32_t, size)
+		__field(uint32_t, data)
+		__field(bool, read)
+	),
 	TP_fast_assign(
 		__entry->addr = addr;
 		__entry->size = size;
-		__entry->result = result;
-		__entry->status = status;
-		__entry->irq_status = irq_status;
-		),
-	TP_printk("addr %08x size %zu: result %08x sts: %08x irq_sts: %08x",
-		__entry->addr, __entry->size, __entry->result,
-		__entry->status, __entry->irq_status
-	   )
+		__entry->data = data;
+		__entry->read = read;
+	),
+	TP_printk("%s addr %08x size %u data %08x", __entry->read ? "read" : "write",
+		  __entry->addr, __entry->size, __entry->data)
 );
 
-TRACE_EVENT(fsi_master_aspeed_opb_write,
-	TP_PROTO(uint32_t addr, uint32_t val, size_t size, uint32_t status, uint32_t irq_status),
-	TP_ARGS(addr, val, size, status, irq_status),
+TRACE_EVENT(fsi_master_aspeed_timeout,
+	TP_PROTO(uint32_t irq, uint32_t status, bool read),
+	TP_ARGS(irq, status, read),
 	TP_STRUCT__entry(
-		__field(uint32_t,    addr)
-		__field(uint32_t,    val)
-		__field(size_t,    size)
-		__field(uint32_t,  status)
-		__field(uint32_t,  irq_status)
-		),
+		__field(uint32_t, irq)
+		__field(uint32_t, status)
+		__field(bool, read)
+	),
 	TP_fast_assign(
-		__entry->addr = addr;
-		__entry->val = val;
-		__entry->size = size;
+		__entry->irq = irq;
 		__entry->status = status;
-		__entry->irq_status = irq_status;
-		),
-	TP_printk("addr %08x val %08x size %zu status: %08x irq_sts: %08x",
-		__entry->addr, __entry->val, __entry->size,
-		__entry->status, __entry->irq_status
-		)
-	);
-
-TRACE_EVENT(fsi_master_aspeed_opb_error,
-	TP_PROTO(uint32_t mresp0, uint32_t mstap0, uint32_t mesrb0),
-	TP_ARGS(mresp0, mstap0, mesrb0),
-	TP_STRUCT__entry(
-		__field(uint32_t,  mresp0)
-		__field(uint32_t,  mstap0)
-		__field(uint32_t,  mesrb0)
-		),
-	TP_fast_assign(
-		__entry->mresp0 = mresp0;
-		__entry->mstap0 = mstap0;
-		__entry->mesrb0 = mesrb0;
-		),
-	TP_printk("mresp0 %08x mstap0 %08x mesrb0 %08x",
-		__entry->mresp0, __entry->mstap0, __entry->mesrb0
-		)
-	);
+		__entry->read = read;
+	),
+	TP_printk("%s irq %08x status %08x", __entry->read ? "read" : "write", __entry->irq,
+		  __entry->status)
+);
 
 TRACE_EVENT(fsi_master_aspeed_cfam_reset,
 	TP_PROTO(bool start),
-- 
2.39.3

[PATCH v3 18/40] fsi: aspeed: Don't clear all IRQs during OPB transfers

[Eddie James]

In order to support FSI interrupts, the OPB transfer functions should
not clear all the IRQs pending. Instead, just write the OPB ACK bit
to the IRQ status register. As commented, this register invisibly
masks the interrupt once the interrupt condition is cleared. Fix this
by writing 0 before each OPB transfer.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 04aa5cb9b6fad..f840c7c4a56b9 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -47,6 +47,11 @@ static const u32 fsi_base = 0xa0000000;
 #define OPB_CLK_SYNC	0x3c
 #define OPB_IRQ_CLEAR	0x40
 #define OPB_IRQ_MASK	0x44
+/*
+ * This register does NOT behave in the expected manner. It is expected that writing 1b would clear
+ * the corresponding interrupt condition. However it also invisibly masks the interrupt! Writing 0b
+ * unmasks again.
+ */
 #define OPB_IRQ_STATUS	0x48
 
 #define OPB0_SELECT	0x10
@@ -113,13 +118,14 @@ static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
 	writel_relaxed(transfer_size, base + OPB0_XFER_SIZE);
 	writel_relaxed(addr, base + OPB0_FSI_ADDR);
 	writel_relaxed(val, base + OPB0_FSI_DATA_W);
-	writel_relaxed(0x1, base + OPB_IRQ_CLEAR);
+	writel_relaxed(0, base + OPB_IRQ_STATUS);
 	writel(0x1, base + OPB_TRIGGER);
 
 	ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg,
 				(reg & OPB0_XFER_ACK_EN) != 0,
 				0, OPB_POLL_TIMEOUT);
 
+	writel(OPB0_XFER_ACK_EN, base + OPB_IRQ_STATUS);
 	status = readl(base + OPB0_STATUS);
 
 	/* Return error when poll timed out */
@@ -165,13 +171,14 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 	writel_relaxed(CMD_READ, base + OPB0_RW);
 	writel_relaxed(transfer_size, base + OPB0_XFER_SIZE);
 	writel_relaxed(addr, base + OPB0_FSI_ADDR);
-	writel_relaxed(0x1, base + OPB_IRQ_CLEAR);
+	writel_relaxed(0, aspeed->base + OPB_IRQ_STATUS);
 	writel(0x1, base + OPB_TRIGGER);
 
 	ret = readl_poll_timeout(base + OPB_IRQ_STATUS, reg,
 			   (reg & OPB0_XFER_ACK_EN) != 0,
 			   0, OPB_POLL_TIMEOUT);
 
+	writel(OPB0_XFER_ACK_EN, base + OPB_IRQ_STATUS);
 	status = readl(base + OPB0_STATUS);
 
 	result = readl(base + OPB0_FSI_DATA_R);
@@ -530,8 +537,6 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	}
 
 	writel(0x1, aspeed->base + OPB_CLK_SYNC);
-	writel(OPB1_XFER_ACK_EN | OPB0_XFER_ACK_EN,
-			aspeed->base + OPB_IRQ_MASK);
 
 	writel(opb_retry_counter, aspeed->base + OPB_RETRY_COUNTER);
 
-- 
2.39.3

[PATCH v3 19/40] fsi: aspeed: Only read result register for successful read

[Eddie James]

No reason to read the result in the error path, and remove the
null pointer check on the output, as it should never be null.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index f840c7c4a56b9..10ca23cf58c2e 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -181,8 +181,6 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 	writel(OPB0_XFER_ACK_EN, base + OPB_IRQ_STATUS);
 	status = readl(base + OPB0_STATUS);
 
-	result = readl(base + OPB0_FSI_DATA_R);
-
 	/* Return error when poll timed out */
 	if (ret) {
 		trace_fsi_master_aspeed_timeout(reg, status, true);
@@ -193,21 +191,20 @@ static int __opb_read(struct fsi_master_aspeed *aspeed, uint32_t addr,
 	if (status & STATUS_ERR_ACK)
 		return -EIO;
 
-	if (out) {
-		switch (transfer_size) {
-		case XFER_BYTE:
-			*(u8 *)out = result;
-			break;
-		case XFER_HALFWORD:
-			*(u16 *)out = result;
-			break;
-		case XFER_FULLWORD:
-			*(u32 *)out = result;
-			break;
-		default:
-			return -EINVAL;
-		}
+	result = readl(base + OPB0_FSI_DATA_R);
 
+	switch (transfer_size) {
+	case XFER_BYTE:
+		*(u8 *)out = result;
+		break;
+	case XFER_HALFWORD:
+		*(u16 *)out = result;
+		break;
+	case XFER_FULLWORD:
+		*(u32 *)out = result;
+		break;
+	default:
+		return -EINVAL;
 	}
 
 	trace_fsi_master_aspeed_opb_xfer(addr, transfer_size + 1, result, true);
-- 
2.39.3

[PATCH v3 20/40] fsi: aspeed: Switch to spinlock

[Eddie James]

In preparation for interrupt support, switch to a spinlock rather
than a mutex.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 10ca23cf58c2e..176e596b4391b 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -8,11 +8,11 @@
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
+#include <linux/spinlock.h>
 #include <linux/iopoll.h>
 #include <linux/gpio/consumer.h>
 
@@ -24,7 +24,7 @@ struct fsi_master_aspeed_data {
 
 struct fsi_master_aspeed {
 	struct fsi_master	master;
-	struct mutex		lock;	/* protect HW access */
+	spinlock_t		lock;	/* protect HW access */
 	struct device		*dev;
 	void __iomem		*base;
 	void __iomem		*ctrl;
@@ -251,6 +251,7 @@ static int aspeed_master_read(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, void *val, size_t size)
 {
 	struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
+	unsigned long flags;
 	int ret;
 
 	if (id > 0x3)
@@ -259,7 +260,7 @@ static int aspeed_master_read(struct fsi_master *master, int link,
 	addr |= id << 21;
 	addr += link * FSI_HUB_LINK_SIZE;
 
-	mutex_lock(&aspeed->lock);
+	spin_lock_irqsave(&aspeed->lock, flags);
 
 	switch (size) {
 	case 1:
@@ -278,7 +279,7 @@ static int aspeed_master_read(struct fsi_master *master, int link,
 
 	ret = check_errors(aspeed, ret);
 done:
-	mutex_unlock(&aspeed->lock);
+	spin_unlock_irqrestore(&aspeed->lock, flags);
 	return ret;
 }
 
@@ -286,6 +287,7 @@ static int aspeed_master_write(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, const void *val, size_t size)
 {
 	struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
+	unsigned long flags;
 	int ret;
 
 	if (id > 0x3)
@@ -294,7 +296,7 @@ static int aspeed_master_write(struct fsi_master *master, int link,
 	addr |= id << 21;
 	addr += link * FSI_HUB_LINK_SIZE;
 
-	mutex_lock(&aspeed->lock);
+	spin_lock_irqsave(&aspeed->lock, flags);
 
 	switch (size) {
 	case 1:
@@ -313,7 +315,7 @@ static int aspeed_master_write(struct fsi_master *master, int link,
 
 	ret = check_errors(aspeed, ret);
 done:
-	mutex_unlock(&aspeed->lock);
+	spin_unlock_irqrestore(&aspeed->lock, flags);
 	return ret;
 }
 
@@ -396,15 +398,16 @@ static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *att
 				const char *buf, size_t count)
 {
 	struct fsi_master_aspeed *aspeed = dev_get_drvdata(dev);
+	unsigned long flags;
 
 	trace_fsi_master_aspeed_cfam_reset(true);
-	mutex_lock(&aspeed->lock);
+	spin_lock_irqsave(&aspeed->lock, flags);
 	gpiod_set_value(aspeed->cfam_reset_gpio, 1);
-	usleep_range(900, 1000);
+	udelay(900);
 	gpiod_set_value(aspeed->cfam_reset_gpio, 0);
-	usleep_range(900, 1000);
+	udelay(900);
 	regmap_write(aspeed->master.map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER);
-	mutex_unlock(&aspeed->lock);
+	spin_unlock_irqrestore(&aspeed->lock, flags);
 	trace_fsi_master_aspeed_cfam_reset(false);
 
 	return count;
@@ -498,6 +501,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	aspeed->dev = &pdev->dev;
+	spin_lock_init(&aspeed->lock);
 
 	aspeed->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(aspeed->base)) {
@@ -583,7 +587,6 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 
 	dev_set_drvdata(&pdev->dev, aspeed);
 
-	mutex_init(&aspeed->lock);
 	rc = fsi_master_init(&aspeed->master, clk_get_rate(aspeed->clk));
 	if (rc)
 		goto err_regmap;
-- 
2.39.3

[PATCH v3 21/40] fsi: aspeed: Disable relative addressing and IPOLL for cfam reset

[Eddie James]

Need to disable these for the master reset after cfam reset.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index 176e596b4391b..c9f6d84e1a372 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -402,11 +402,18 @@ static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *att
 
 	trace_fsi_master_aspeed_cfam_reset(true);
 	spin_lock_irqsave(&aspeed->lock, flags);
+
+	regmap_write(aspeed->master.map, FSI_MMODE,
+		     aspeed->master.mmode & ~(FSI_MMODE_EIP | FSI_MMODE_RELA));
+
 	gpiod_set_value(aspeed->cfam_reset_gpio, 1);
 	udelay(900);
 	gpiod_set_value(aspeed->cfam_reset_gpio, 0);
 	udelay(900);
+
 	regmap_write(aspeed->master.map, FSI_MRESP0, FSI_MRESP_RST_ALL_MASTER);
+	regmap_write(aspeed->master.map, FSI_MMODE, aspeed->master.mmode);
+
 	spin_unlock_irqrestore(&aspeed->lock, flags);
 	trace_fsi_master_aspeed_cfam_reset(false);
 
-- 
2.39.3

[PATCH v3 22/40] fsi: aspeed: Use common master error handler

[Eddie James]

This will do the correct mmode manipulation to do the master
reset.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c | 27 ++++-----------------------
 1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index c9f6d84e1a372..eecd64bc29512 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -226,27 +226,6 @@ static int opb_readb(struct fsi_master_aspeed *aspeed, uint32_t addr, u8 *out)
 	return __opb_read(aspeed, addr, XFER_BYTE, (void *)out);
 }
 
-static int check_errors(struct fsi_master_aspeed *aspeed, int err)
-{
-	int ret;
-
-	if (err == -EIO) {
-		/* Check MAEB (0x70) ? */
-
-		/* Then clear errors in master */
-		ret = opb_writel(aspeed, ctrl_base + FSI_MRESP0,
-				cpu_to_be32(FSI_MRESP_RST_ALL_MASTER));
-		if (ret) {
-			/* TODO: log? return different code? */
-			return ret;
-		}
-		/* TODO: confirm that 0x70 was okay */
-	}
-
-	/* This will pass through timeout errors */
-	return err;
-}
-
 static int aspeed_master_read(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, void *val, size_t size)
 {
@@ -277,7 +256,8 @@ static int aspeed_master_read(struct fsi_master *master, int link,
 		goto done;
 	}
 
-	ret = check_errors(aspeed, ret);
+	if (ret == -EIO)
+		fsi_master_error(&aspeed->master, link);
 done:
 	spin_unlock_irqrestore(&aspeed->lock, flags);
 	return ret;
@@ -313,7 +293,8 @@ static int aspeed_master_write(struct fsi_master *master, int link,
 		goto done;
 	}
 
-	ret = check_errors(aspeed, ret);
+	if (ret == -EIO)
+		fsi_master_error(&aspeed->master, link);
 done:
 	spin_unlock_irqrestore(&aspeed->lock, flags);
 	return ret;
-- 
2.39.3

[PATCH v3 23/40] fsi: core: Add interrupt support

[Eddie James]

Add an irq chip to the FSI master structure to control slave interrupt
masking. Add a function to request an IRQ from the FSI device.
The FSI master IRQ mapping is based on the FSI device engine type and
slave link.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Remove slave interrupt handler since it's not used yet

 drivers/fsi/fsi-core.c     | 159 +++++++++++++++++++++++++++++++++++++
 drivers/fsi/fsi-master.h   |   9 +++
 include/linux/fsi.h        |   2 +
 include/trace/events/fsi.h |  60 ++++++++++++++
 4 files changed, 230 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 8b402149acbe9..ae65d87d4b13e 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -14,10 +14,12 @@
 #include <linux/device.h>
 #include <linux/fsi.h>
 #include <linux/idr.h>
+#include <linux/irqdomain.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
@@ -109,6 +111,67 @@ int fsi_device_peek(struct fsi_device *dev, void *val)
 
 	return fsi_slave_read(dev->slave, addr, val, sizeof(uint32_t));
 }
+EXPORT_SYMBOL_GPL(fsi_device_peek);
+
+static int fsi_request_irq(struct fsi_slave *slave, irq_handler_t handler, void *data,
+			   unsigned int engine_irq, struct device *dev)
+{
+	struct device_node *parent = of_node_get(slave->master->dev.of_node);
+	struct irq_fwspec fwspec;
+	unsigned int irq;
+
+	/*
+	 * FSI devices can only report interrupts to their own master, so if the master
+	 * isn't an interrupt controller, don't try and map an irq.
+	 */
+	if (!of_get_property(parent, "#interrupt-cells", NULL)) {
+		of_node_put(parent);
+		return -EINVAL;
+	}
+
+	fwspec.fwnode = of_node_to_fwnode(parent);
+	fwspec.param_count = 1;
+	fwspec.param[0] = engine_irq + (slave->link * FSI_IRQ_COUNT);
+	irq = irq_create_fwspec_mapping(&fwspec);
+	if (!irq)
+		return -EINVAL;
+
+	return devm_request_irq(dev, irq, handler, 0, dev_name(dev), data);
+}
+
+int fsi_device_request_irq(struct fsi_device *dev, irq_handler_t handler, void *data)
+{
+	unsigned int engine_irq;
+
+	switch (dev->engine_type) {
+	case 0x4:	// shift
+		engine_irq = 1;
+		break;
+	case 0x5:	// scom
+		engine_irq = 2;
+		break;
+	case 0x6:	// scratchpad
+		engine_irq = 3;
+		break;
+	case 0x7:	// i2cm
+		engine_irq = 4;
+		break;
+	case 0x20:	// mbox
+		engine_irq = 7;
+		break;
+	case 0x22:	// sbefifo
+		engine_irq = 6;
+		break;
+	case 0x23:	// spim
+		engine_irq = 5;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return fsi_request_irq(dev->slave, handler, data, engine_irq, &dev->dev);
+}
+EXPORT_SYMBOL_GPL(fsi_device_request_irq);
 
 unsigned long fsi_device_local_bus_frequency(struct fsi_device *dev)
 {
@@ -1467,6 +1530,99 @@ void fsi_master_regmap_config(struct regmap_config *config)
 }
 EXPORT_SYMBOL_GPL(fsi_master_regmap_config);
 
+int fsi_master_irq(struct fsi_master *master, struct irq_domain *irq_domain, unsigned int link)
+{
+	struct irq_desc *downstream = irq_resolve_mapping(irq_domain, (link * FSI_IRQ_COUNT) + 8);
+	unsigned long size = FSI_SI1S_SLAVE_BIT + 1;
+	unsigned long bit = FSI_SI1S_MBOX_BIT;
+	unsigned long srsis0 = 0;
+	unsigned long srsis4 = 0;
+	unsigned long si1s;
+	__be32 reg;
+	int rc;
+
+	rc = fsi_master_read(master, link, 0, FSI_SLAVE_BASE + FSI_SI1S, &reg, sizeof(reg));
+	if (rc)
+		return rc;
+
+	si1s = (unsigned long)be32_to_cpu(reg);
+	for_each_set_bit_from(bit, &si1s, size)
+		generic_handle_domain_irq(irq_domain, (link * FSI_IRQ_COUNT) + (31 - bit));
+
+	if (downstream) {
+		int i;
+
+		master->remote_interrupt_status = 0;
+
+		rc = fsi_master_read(master, link, 0, FSI_SLAVE_BASE + FSI_SRSIS0, &reg,
+				     sizeof(reg));
+		if (rc)
+			return rc;
+
+		srsis0 = (unsigned long)be32_to_cpu(reg);
+		for (i = 0; i < 4; ++i) {
+			if (srsis0 & (0xff000000 >> (8 * i)))
+				master->remote_interrupt_status |= (1 << i);
+		}
+
+		rc = fsi_master_read(master, link, 0, FSI_SLAVE_BASE + FSI_SRSIS4, &reg,
+				     sizeof(reg));
+		if (rc)
+			return rc;
+
+		srsis4 = (unsigned long)be32_to_cpu(reg);
+		for (i = 0; i < 4; ++i) {
+			if (srsis4 & (0xff000000 >> (8 * i)))
+				master->remote_interrupt_status |= (16 << i);
+		}
+
+		if (master->remote_interrupt_status) {
+			handle_irq_desc(downstream);
+
+			reg = cpu_to_be32(0xffffffff);
+			if (master->remote_interrupt_status & 0xf)
+				fsi_master_write(master, link, 0, FSI_SLAVE_BASE + FSI_SRSIC0,
+						 &reg, sizeof(reg));
+
+			if (master->remote_interrupt_status & 0xf0)
+				fsi_master_write(master, link, 0, FSI_SLAVE_BASE + FSI_SRSIC4,
+						 &reg, sizeof(reg));
+		}
+	}
+
+	trace_fsi_master_irq(master, link, si1s, srsis0, srsis4);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(fsi_master_irq);
+
+static void fsi_master_irq_mask(struct irq_data *data)
+{
+	unsigned int bit = 31 - (data->hwirq % FSI_IRQ_COUNT);
+
+	if (bit >= FSI_SI1S_MBOX_BIT) {
+		struct fsi_master *master = irq_data_get_irq_chip_data(data);
+		int link = data->hwirq / FSI_IRQ_COUNT;
+		__be32 mask = cpu_to_be32(BIT(bit));
+
+		trace_fsi_master_irq_mask(master, link, data->hwirq % FSI_IRQ_COUNT, true);
+		fsi_master_write(master, link, 0, FSI_SLAVE_BASE + FSI_SCI1M, &mask, sizeof(mask));
+	}
+}
+
+static void fsi_master_irq_unmask(struct irq_data *data)
+{
+	unsigned int bit = 31 - (data->hwirq % FSI_IRQ_COUNT);
+
+	if (bit >= FSI_SI1S_MBOX_BIT) {
+		struct fsi_master *master = irq_data_get_irq_chip_data(data);
+		int link = data->hwirq / FSI_IRQ_COUNT;
+		__be32 mask = cpu_to_be32(BIT(bit));
+
+		trace_fsi_master_irq_mask(master, link, data->hwirq % FSI_IRQ_COUNT, false);
+		fsi_master_write(master, link, 0, FSI_SLAVE_BASE + FSI_SSI1M, &mask, sizeof(mask));
+	}
+}
+
 int fsi_master_register(struct fsi_master *master)
 {
 	int rc;
@@ -1491,6 +1647,9 @@ int fsi_master_register(struct fsi_master *master)
 	if (master->flags & FSI_MASTER_FLAG_SWCLOCK)
 		master->clock_frequency = 100000000; // POWER reference clock
 
+	master->irq_chip.name = dev_name(&master->dev);
+	master->irq_chip.irq_mask = fsi_master_irq_mask;
+	master->irq_chip.irq_unmask = fsi_master_irq_unmask;
 	master->dev.class = &fsi_master_class;
 
 	mutex_lock(&master->scan_lock);
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index 8ea2f69ec4922..2104902091e05 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -10,6 +10,7 @@
 #define DRIVERS_FSI_MASTER_H
 
 #include <linux/device.h>
+#include <linux/irq.h>
 #include <linux/mutex.h>
 
 /*
@@ -112,6 +113,7 @@
 /* Misc */
 #define	FSI_CRC_SIZE		4
 #define FSI_LINK_ENABLE_SETUP_TIME	10	/* in mS */
+#define FSI_IRQ_COUNT		9
 
 /* fsi-master definition and flags */
 #define FSI_MASTER_FLAG_SWCLOCK		0x1
@@ -137,6 +139,7 @@ struct fsi_master {
 	int		n_links;
 	int		flags;
 	struct mutex	scan_lock;
+	struct irq_chip	irq_chip;
 	int		(*read)(struct fsi_master *, int link, uint8_t id,
 				uint32_t addr, void *val, size_t size);
 	int		(*write)(struct fsi_master *, int link, uint8_t id,
@@ -147,6 +150,7 @@ struct fsi_master {
 				       bool enable);
 	int		(*link_config)(struct fsi_master *, int link,
 				       u8 t_send_delay, u8 t_echo_delay);
+	u8		remote_interrupt_status;
 };
 
 #define to_fsi_master(d) container_of(d, struct fsi_master, dev)
@@ -176,4 +180,9 @@ extern void fsi_master_unregister(struct fsi_master *master);
 
 extern int fsi_master_rescan(struct fsi_master *master);
 
+struct irq_domain;
+
+extern int fsi_master_irq(struct fsi_master *master, struct irq_domain *irq_domain,
+			  unsigned int link);
+
 #endif /* DRIVERS_FSI_MASTER_H */
diff --git a/include/linux/fsi.h b/include/linux/fsi.h
index e0309bf0ae072..c249a95b7ff84 100644
--- a/include/linux/fsi.h
+++ b/include/linux/fsi.h
@@ -8,6 +8,7 @@
 #define LINUX_FSI_H
 
 #include <linux/device.h>
+#include <linux/interrupt.h>
 
 struct fsi_device {
 	struct device		dev;
@@ -25,6 +26,7 @@ extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
 		const void *val, size_t size);
 extern int fsi_device_peek(struct fsi_device *dev, void *val);
 extern unsigned long fsi_device_local_bus_frequency(struct fsi_device *dev);
+extern int fsi_device_request_irq(struct fsi_device *dev, irq_handler_t handler, void *data);
 
 struct fsi_device_id {
 	u8	engine_type;
diff --git a/include/trace/events/fsi.h b/include/trace/events/fsi.h
index da977d59e163e..0e4d717ee0adb 100644
--- a/include/trace/events/fsi.h
+++ b/include/trace/events/fsi.h
@@ -8,6 +8,47 @@
 
 #include <linux/tracepoint.h>
 
+TRACE_EVENT(fsi_master_irq,
+	TP_PROTO(const struct fsi_master *master, unsigned int link, uint32_t si1s,
+		 uint32_t srsis0, uint32_t srsis4),
+	TP_ARGS(master, link, si1s, srsis0, srsis4),
+	TP_STRUCT__entry(
+		__field(int, master_idx)
+		__field(unsigned int, link)
+		__field(uint32_t, si1s)
+		__field(uint32_t, srsis0)
+		__field(uint32_t, srsis4)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->idx;
+		__entry->link = link;
+		__entry->si1s = si1s;
+		__entry->srsis0 = srsis0;
+		__entry->srsis4 = srsis4;
+	),
+	TP_printk("fsi%d:%02d si1s:%08x srsis0:%08x srsis4:%08x", __entry->master_idx,
+		  __entry->link, __entry->si1s, __entry->srsis0, __entry->srsis4)
+);
+
+TRACE_EVENT(fsi_master_irq_mask,
+	TP_PROTO(const struct fsi_master *master, unsigned int link, unsigned int bit, bool mask),
+	TP_ARGS(master, link, bit, mask),
+	TP_STRUCT__entry(
+		__field(int, master_idx)
+		__field(unsigned int, link)
+		__field(unsigned int, bit)
+		__field(bool, mask)
+	),
+	TP_fast_assign(
+		__entry->master_idx = master->idx;
+		__entry->link = link;
+		__entry->bit = bit;
+		__entry->mask = mask;
+	),
+	TP_printk("fsi%d:%02d %s bit:%d", __entry->master_idx, __entry->link,
+		  __entry->mask ? "mask" : "unmask", __entry->bit)
+);
+
 TRACE_EVENT(fsi_master_xfer,
 	TP_PROTO(int master_idx, int link, int id, uint32_t addr, size_t size, const void *data,
 		 bool read),
-- 
2.39.3

Re: [PATCH v3 23/40] fsi: core: Add interrupt support

[kernel test robot]

Hi Eddie,

kernel test robot noticed the following build errors:

[auto build test ERROR on andi-shyti/i2c/i2c-host]
[also build test ERROR on robh/for-next broonie-spi/for-next linus/master v6.9 next-20240517]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eddie-James/fsi-hub-Set-master-index-to-link-number-plus-one/20240517-023205
base:   git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20240516181907.3468796-24-eajames%40linux.ibm.com
patch subject: [PATCH v3 23/40] fsi: core: Add interrupt support
config: x86_64-randconfig-102-20240517 (https://download.01.org/0day-ci/archive/20240518/202405180410.FkV8wPos-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240518/202405180410.FkV8wPos-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405180410.FkV8wPos-lkp@intel.com/

All errors (new ones prefixed by >>, old ones prefixed by <<):

WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/locking/locktorture.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcutorture.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcuscale.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/refscale.o
WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/torture.o
WARNING: modpost: missing MODULE_DESCRIPTION() in mm/kasan/kasan_test_module.o
WARNING: modpost: missing MODULE_DESCRIPTION() in mm/zsmalloc.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nfs/nfsv4.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp437.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp737.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp775.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp857.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp860.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp865.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp1251.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_iso8859-2.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_iso8859-3.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_cp1255.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_iso8859-15.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_koi8-r.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_koi8-u.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_koi8-ru.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_utf8.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-croatian.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-gaelic.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-greek.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-iceland.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-romanian.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/mac-turkish.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/nls/nls_ucs2_utils.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/fat/fat.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/smb/common/cifs_arc4.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/smb/common/cifs_md4.o
WARNING: modpost: missing MODULE_DESCRIPTION() in fs/autofs/autofs4.o
WARNING: modpost: missing MODULE_DESCRIPTION() in security/keys/trusted-keys/trusted.o
WARNING: modpost: missing MODULE_DESCRIPTION() in crypto/ecc.o
WARNING: modpost: missing MODULE_DESCRIPTION() in block/t10-pi.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libdes.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_firmware.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_sysctl.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_min_heap.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_module.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_rhashtable.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_user_copy.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_bitmap.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_memcat_p.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_meminit.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/test_free_pages.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/asn1_decoder.o
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/asn1_encoder.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pinctrl/pinctrl-mcp23s08_i2c.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pinctrl/pinctrl-mcp23s08_spi.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/pinctrl/pinctrl-mcp23s08.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/video/backlight/platform_lcd.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/dma/dmatest.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/tty/ttynull.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/nvram.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/ppdev.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/gpu/drm/bridge/lontium-lt9611.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/base/regmap/regmap-spmi.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/base/regmap/regmap-w1.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/misc/open-dice.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mfd/arizona.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mfd/pcf50633-gpio.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/scsi/scsi_common.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mtd/chips/cfi_util.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/rtc/rtc-tps65910.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hwmon/corsair-cpro.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/mmc/core/pwrseq_emmc.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-apple.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-aureal.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-cypress.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-emsff.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-ezkey.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-ite.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-keytouch.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-lcpower.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-magicmouse.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-mf.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-microsoft.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-primax.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-gaff.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-topseed.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-zydacron.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-viewsonic.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-spilib.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-log.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-power-supply.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-raw.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-gbphy.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-i2c.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-sdio.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/greybus/gb-spi.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/platform/goldfish/goldfish_pipe.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/devfreq/governor_userspace.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/spmi/hisi-spmi-controller.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/uio/uio.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/fsi/fsi-core.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/fsi/fsi-master-gpio.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/fsi/fsi-scom.o
>> ERROR: modpost: "handle_irq_desc" [drivers/fsi/fsi-core.ko] undefined!

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH v3 24/40] fsi: aspeed: Add interrupt support

[Eddie James]

Handle slave interrupts and pass them to the FSI core.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-aspeed.c          | 106 ++++++++++++++++++++++-
 include/trace/events/fsi_master_aspeed.h |  12 +++
 2 files changed, 115 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index eecd64bc29512..34f4c9e00e43d 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -6,6 +6,8 @@
 #include <linux/delay.h>
 #include <linux/fsi.h>
 #include <linux/io.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/irqdomain.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -25,11 +27,13 @@ struct fsi_master_aspeed_data {
 struct fsi_master_aspeed {
 	struct fsi_master	master;
 	spinlock_t		lock;	/* protect HW access */
+	struct irq_domain	*irq_domain;
 	struct device		*dev;
 	void __iomem		*base;
 	void __iomem		*ctrl;
 	struct clk		*clk;
 	struct gpio_desc	*cfam_reset_gpio;
+	u32			irq_mask;
 };
 
 #define to_fsi_master_aspeed(m) \
@@ -79,6 +83,11 @@ static const u32 fsi_base = 0xa0000000;
 #define STATUS_TIMEOUT		BIT(4)
 
 /* OPB_IRQ_MASK */
+#define FSI_MASTER_ERROR_IRQ	BIT(28)
+#define FSI_PORT_ERROR_IRQ	BIT(27)
+#define FSI_HOTPLUG_IRQ		BIT(26)
+#define FSI_REMOTE_SLV_IRQ(l)	(BIT(FSI_REMOTE_SLV_IRQ_BIT) << (l))
+#define FSI_REMOTE_SLV_IRQ_BIT	18
 #define OPB1_XFER_ACK_EN BIT(17)
 #define OPB0_XFER_ACK_EN BIT(16)
 
@@ -96,7 +105,7 @@ static const u32 fsi_base = 0xa0000000;
 #define OPB_RC_CTRL_OPB		BIT(18)	/* Access controller over OPB, not AHB (AST27xx+) */
 #define OPB_RC_XFER_ACK_EN	BIT(16)	/* Enable OPBx xfer ack bit without mask */
 #define OPB_RC_COUNT		GENMASK(15, 0)	/* Number of retries */
-#define OPB_RC_DEFAULT		0x10
+#define OPB_RC_DEFAULT		(OPB_RC_XFER_ACK_EN | 0x10)
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/fsi_master_aspeed.h>
@@ -322,11 +331,76 @@ static int aspeed_master_break(struct fsi_master *master, int link)
 	return aspeed_master_write(master, link, 0, addr, &cmd, 4);
 }
 
+static int aspeed_master_link_enable(struct fsi_master *master, int link, bool enable)
+{
+	struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
+	unsigned long flags;
+	int rc;
+
+	spin_lock_irqsave(&aspeed->lock, flags);
+	if (enable) {
+		rc = fsi_master_link_enable(master, link, enable);
+		if (rc)
+			goto done;
+
+		aspeed->irq_mask |= FSI_REMOTE_SLV_IRQ(link);
+		writel(aspeed->irq_mask, aspeed->base + OPB_IRQ_MASK);
+	} else {
+		aspeed->irq_mask &= ~FSI_REMOTE_SLV_IRQ(link);
+		writel(aspeed->irq_mask, aspeed->base + OPB_IRQ_MASK);
+
+		rc = fsi_master_link_enable(master, link, enable);
+	}
+
+done:
+	spin_unlock_irqrestore(&aspeed->lock, flags);
+	return rc;
+}
+
+static irqreturn_t aspeed_master_irq(int irq, void *data)
+{
+	struct fsi_master_aspeed *aspeed = data;
+	unsigned long size = FSI_REMOTE_SLV_IRQ_BIT + aspeed->master.n_links;
+	unsigned long bit = FSI_REMOTE_SLV_IRQ_BIT;
+	unsigned long status;
+
+	status = readl(aspeed->base + OPB_IRQ_STATUS);
+	writel(0, aspeed->base + OPB_IRQ_MASK);
+
+	for_each_set_bit_from(bit, &status, size)
+		fsi_master_irq(&aspeed->master, aspeed->irq_domain, bit - FSI_REMOTE_SLV_IRQ_BIT);
+
+	writel(status, aspeed->base + OPB_IRQ_STATUS);
+	writel(0, aspeed->base + OPB_IRQ_STATUS);
+	writel(aspeed->irq_mask, aspeed->base + OPB_IRQ_MASK);
+
+	trace_fsi_master_aspeed_irq(status);
+	return IRQ_HANDLED;
+}
+
+static int aspeed_master_irqd_map(struct irq_domain *domain, unsigned int irq,
+				  irq_hw_number_t hwirq)
+{
+	struct fsi_master_aspeed *aspeed = domain->host_data;
+
+	irq_set_chip_and_handler(irq, &aspeed->master.irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, &aspeed->master);
+
+	return 0;
+}
+
+static const struct irq_domain_ops aspeed_master_irq_domain_ops = {
+	.map = aspeed_master_irqd_map,
+};
+
 static void aspeed_master_release(struct device *dev)
 {
 	struct fsi_master_aspeed *aspeed =
 		to_fsi_master_aspeed(to_fsi_master(dev));
 
+	if (aspeed->irq_domain)
+		irq_domain_remove(aspeed->irq_domain);
+
 	regmap_exit(aspeed->master.map);
 	kfree(aspeed);
 }
@@ -477,6 +551,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	struct resource *res;
 	unsigned int reg;
 	int rc, links;
+	int irq;
 
 	rc = tacoma_cabled_fsi_fixup(&pdev->dev);
 	if (rc) {
@@ -567,11 +642,12 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	aspeed->master.dev.of_node = of_node_get(dev_of_node(&pdev->dev));
 
 	aspeed->master.n_links = links;
-	aspeed->master.flags = FSI_MASTER_FLAG_RELA;
+	aspeed->master.flags = FSI_MASTER_FLAG_INTERRUPT | FSI_MASTER_FLAG_RELA;
 	aspeed->master.read = aspeed_master_read;
 	aspeed->master.write = aspeed_master_write;
 	aspeed->master.send_break = aspeed_master_break;
 	aspeed->master.term = aspeed_master_term;
+	aspeed->master.link_enable = aspeed_master_link_enable;
 
 	dev_set_drvdata(&pdev->dev, aspeed);
 
@@ -579,9 +655,30 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	if (rc)
 		goto err_regmap;
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq > 0) {
+		unsigned int size = links * FSI_IRQ_COUNT;
+
+		aspeed->irq_domain = irq_domain_add_linear(aspeed->dev->of_node, size,
+							   &aspeed_master_irq_domain_ops, aspeed);
+		if (aspeed->irq_domain) {
+			rc = devm_request_irq(aspeed->dev, irq, aspeed_master_irq, 0,
+					      dev_name(aspeed->dev), aspeed);
+			if (rc) {
+				dev_warn(aspeed->dev, "failed to request irq:%d\n", irq);
+				irq_domain_remove(aspeed->irq_domain);
+				aspeed->irq_domain = NULL;
+			} else {
+				dev_info(aspeed->dev, "enabling interrupts irq:%d\n", irq);
+			}
+		} else {
+			dev_warn(aspeed->dev, "failed to create irq domain\n");
+		}
+	}
+
 	rc = fsi_master_register(&aspeed->master);
 	if (rc)
-		goto err_regmap;
+		goto err_irq;
 
 	/* At this point, fsi_master_register performs the device_initialize(),
 	 * and holds the sole reference on master.dev. This means the device
@@ -593,6 +690,9 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
 	get_device(&aspeed->master.dev);
 	return 0;
 
+err_irq:
+	if (aspeed->irq_domain)
+		irq_domain_remove(aspeed->irq_domain);
 err_regmap:
 	regmap_exit(aspeed->master.map);
 err_release:
diff --git a/include/trace/events/fsi_master_aspeed.h b/include/trace/events/fsi_master_aspeed.h
index 7eeecbfec7f09..dba1776334a0e 100644
--- a/include/trace/events/fsi_master_aspeed.h
+++ b/include/trace/events/fsi_master_aspeed.h
@@ -8,6 +8,18 @@
 
 #include <linux/tracepoint.h>
 
+TRACE_EVENT(fsi_master_aspeed_irq,
+	TP_PROTO(uint32_t status),
+	TP_ARGS(status),
+	TP_STRUCT__entry(
+		__field(uint32_t, status)
+	),
+	TP_fast_assign(
+		__entry->status = status;
+	),
+	TP_printk("status %08x", __entry->status)
+);
+
 TRACE_EVENT(fsi_master_aspeed_opb_xfer,
 	TP_PROTO(uint32_t addr, uint32_t size, uint32_t data, bool read),
 	TP_ARGS(addr, size, data, read),
-- 
2.39.3

[PATCH v3 25/40] fsi: hub: Add interrupt support

[Eddie James]

The hub master receives it's interrupts from the local slave register
space, which is handled in the FSI core. Therefore, just route the remote
slave interrupts to the hub link device interrupts.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-hub.c | 119 ++++++++++++++++++++++++++++++++++-
 1 file changed, 116 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index 91ad6b7728fa2..4dbc542500bbd 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -7,8 +7,10 @@
 
 #include <linux/delay.h>
 #include <linux/fsi.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 
@@ -35,9 +37,10 @@
  */
 struct fsi_master_hub {
 	struct fsi_master	master;
+	struct irq_domain	*irq_domain;
 	struct fsi_device	*upstream;
-	uint32_t		addr, size;	/* slave-relative addr of */
-						/* master address space */
+	uint32_t		addr;
+	uint32_t		size;
 };
 
 #define to_fsi_master_hub(m) container_of(m, struct fsi_master_hub, master)
@@ -77,10 +80,81 @@ static int hub_master_break(struct fsi_master *master, int link)
 	return hub_master_write(master, link, 0, addr, &cmd, sizeof(cmd));
 }
 
+static int hub_master_link_enable(struct fsi_master *master, int link,
+				  bool enable)
+{
+	struct fsi_master_hub *hub = to_fsi_master_hub(master);
+	u32 srsim = 0xff000000 >> (8 * (link % 4));
+	int slave_idx = 4 * (link / 4);
+	__be32 srsim_be;
+	int ret;
+
+	ret = fsi_slave_read(hub->upstream->slave, FSI_SLAVE_BASE + FSI_SRSIM0 + slave_idx,
+			     &srsim_be, sizeof(srsim_be));
+	if (ret)
+		return ret;
+
+	if (enable) {
+		ret = fsi_master_link_enable(master, link, enable);
+		if (ret)
+			return ret;
+
+		srsim |= be32_to_cpu(srsim_be);
+		srsim_be = cpu_to_be32(srsim);
+		ret = fsi_slave_write(hub->upstream->slave,
+				      FSI_SLAVE_BASE + FSI_SRSIM0 + slave_idx, &srsim_be,
+				      sizeof(srsim_be));
+	} else {
+		srsim = be32_to_cpu(srsim_be) & ~srsim;
+		srsim_be = cpu_to_be32(srsim);
+		ret = fsi_slave_write(hub->upstream->slave,
+				      FSI_SLAVE_BASE + FSI_SRSIM0 + slave_idx, &srsim_be,
+				      sizeof(srsim_be));
+		if (ret)
+			return ret;
+
+		ret = fsi_master_link_enable(master, link, enable);
+	}
+
+	return ret;
+}
+
+static irqreturn_t hub_master_irq(int irq, void *data)
+{
+	struct fsi_master_hub *hub = data;
+	struct fsi_master *parent = hub->upstream->slave->master;
+	unsigned int link = 0;
+
+	for (; link < FSI_HUB_MASTER_MAX_LINKS; ++link) {
+		if (parent->remote_interrupt_status & (1 << link))
+			fsi_master_irq(&hub->master, hub->irq_domain, link);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int hub_master_irqd_map(struct irq_domain *domain, unsigned int irq,
+			       irq_hw_number_t hwirq)
+{
+	struct fsi_master_hub *hub = domain->host_data;
+
+	irq_set_chip_and_handler(irq, &hub->master.irq_chip, handle_simple_irq);
+	irq_set_chip_data(irq, &hub->master);
+
+	return 0;
+}
+
+static const struct irq_domain_ops hub_master_irq_domain_ops = {
+	.map = hub_master_irqd_map,
+};
+
 static void hub_master_release(struct device *dev)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(to_fsi_master(dev));
 
+	if (hub->irq_domain)
+		irq_domain_remove(hub->irq_domain);
+
 	regmap_exit(hub->master.map);
 	kfree(hub);
 }
@@ -135,6 +209,7 @@ static int hub_master_probe(struct device *dev)
 	hub->master.read = hub_master_read;
 	hub->master.write = hub_master_write;
 	hub->master.send_break = hub_master_break;
+	hub->master.link_enable = hub_master_link_enable;
 
 	dev_set_drvdata(dev, hub);
 
@@ -142,9 +217,44 @@ static int hub_master_probe(struct device *dev)
 	if (rc)
 		goto err_free;
 
+	if (of_property_read_bool(dev->of_node, "interrupt-controller")) {
+		struct device_node *parent = of_irq_find_parent(dev->of_node);
+
+		if (parent) {
+			struct irq_fwspec fwspec;
+			unsigned int irq;
+
+			fwspec.fwnode = of_node_to_fwnode(parent);
+			fwspec.param_count = 1;
+			fwspec.param[0] = (fsi_dev->slave->link * FSI_IRQ_COUNT) + 8;
+			irq = irq_create_fwspec_mapping(&fwspec);
+			if (irq) {
+				unsigned int size = links * FSI_IRQ_COUNT;
+
+				hub->irq_domain = irq_domain_add_linear(dev->of_node, size,
+									&hub_master_irq_domain_ops,
+									hub);
+
+				if (hub->irq_domain) {
+					rc = devm_request_irq(dev, irq, hub_master_irq, 0,
+							      dev_name(dev), hub);
+					if (rc) {
+						dev_warn(dev, "failed to request irq:%u\n", irq);
+						irq_domain_remove(hub->irq_domain);
+						hub->irq_domain = NULL;
+					} else {
+						dev_info(dev, "enabling interrupts irq:%u\n", irq);
+					}
+				} else {
+					dev_warn(dev, "failed to create irq domain\n");
+				}
+			}
+		}
+	}
+
 	rc = fsi_master_register(&hub->master);
 	if (rc)
-		goto err_free;
+		goto err_irq;
 
 	/* At this point, fsi_master_register performs the device_initialize(),
 	 * and holds the sole reference on master.dev. This means the device
@@ -156,6 +266,9 @@ static int hub_master_probe(struct device *dev)
 	get_device(&hub->master.dev);
 	return 0;
 
+err_irq:
+	if (hub->irq_domain)
+		irq_domain_remove(hub->irq_domain);
 err_free:
 	kfree(hub);
 err_release:
-- 
2.39.3

[PATCH v3 26/40] i2c: fsi: Calculate clock divider from local bus frequency

[Eddie James]

Use the new FSI device local bus clock to calculate the proper
i2c clock divder and look up an optional clock-frequency property
from device tree. Change the default clock divider to 7 now that
the default local bus clock divider has been reduced as well.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Change minimum clock div to 3
 - Use DIV_ROUND_UP instead of re-implementing it
 - Better logic for checking for clock-frequency property

 drivers/i2c/busses/i2c-fsi.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 10332693edf0d..2404ace8c56fa 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -27,7 +27,8 @@
 
 #define FSI_ENGID_I2C		0x7
 
-#define I2C_DEFAULT_CLK_DIV	6
+#define I2C_DEFAULT_CLK_DIV	7
+#define I2C_DEFAULT_CLK_RATE	400000
 
 /* i2c registers */
 #define I2C_FSI_FIFO		0x00
@@ -150,6 +151,7 @@ struct fsi_i2c_master {
 	u8			fifo_size;
 	struct list_head	ports;
 	struct mutex		lock;
+	u32			clock_div;
 };
 
 struct fsi_i2c_port {
@@ -194,7 +196,7 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 	if (rc)
 		return rc;
 
-	mode |= FIELD_PREP(I2C_MODE_CLKDIV, I2C_DEFAULT_CLK_DIV);
+	mode |= FIELD_PREP(I2C_MODE_CLKDIV, i2c->clock_div);
 	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode);
 	if (rc)
 		return rc;
@@ -680,6 +682,7 @@ static int fsi_i2c_probe(struct device *dev)
 	struct fsi_i2c_port *port;
 	struct device_node *np;
 	u32 port_no, ports, stat;
+	u32 lbus;
 	int rc;
 
 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
@@ -689,6 +692,19 @@ static int fsi_i2c_probe(struct device *dev)
 	mutex_init(&i2c->lock);
 	i2c->fsi = to_fsi_dev(dev);
 	INIT_LIST_HEAD(&i2c->ports);
+	i2c->clock_div = I2C_DEFAULT_CLK_DIV;
+
+	lbus = fsi_device_local_bus_frequency(i2c->fsi);
+	if (lbus) {
+		u32 clock;
+
+		if (device_property_read_u32(dev, "clock-frequency", &clock) || !clock)
+			clock = I2C_DEFAULT_CLK_RATE;
+
+		i2c->clock_div = DIV_ROUND_UP(DIV_ROUND_UP(lbus, clock), 4) - 1;
+		if (i2c->clock_div <= 2)
+			i2c->clock_div = 3;
+	}
 
 	rc = fsi_i2c_dev_init(i2c);
 	if (rc)
-- 
2.39.3

[PATCH v3 27/40] i2c: fsi: Improve formatting

[Eddie James]

No functional change. Remove holes in the master structure. Re-order
local variables to look pretty. Remove some local variables in favor of
using their containing structure.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
Changes since v2:
 - Add detail to commit message.

 drivers/i2c/busses/i2c-fsi.c | 125 +++++++++++++++++------------------
 1 file changed, 60 insertions(+), 65 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 2404ace8c56fa..8fb5b51b74a4d 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -148,10 +148,10 @@
 
 struct fsi_i2c_master {
 	struct fsi_device	*fsi;
-	u8			fifo_size;
 	struct list_head	ports;
 	struct mutex		lock;
 	u32			clock_div;
+	u8			fifo_size;
 };
 
 struct fsi_i2c_port {
@@ -165,15 +165,14 @@ struct fsi_i2c_port {
 static int fsi_i2c_read_reg(struct fsi_device *fsi, unsigned int reg,
 			    u32 *data)
 {
-	int rc;
 	__be32 data_be;
+	int rc;
 
 	rc = fsi_device_read(fsi, reg, &data_be, sizeof(data_be));
 	if (rc)
 		return rc;
 
 	*data = be32_to_cpu(data_be);
-
 	return 0;
 }
 
@@ -187,9 +186,11 @@ static int fsi_i2c_write_reg(struct fsi_device *fsi, unsigned int reg,
 
 static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 {
-	int rc;
-	u32 mode = I2C_MODE_ENHANCED, extended_status, watermark;
+	u32 mode = I2C_MODE_ENHANCED;
+	u32 extended_status;
 	u32 interrupt = 0;
+	u32 watermark;
+	int rc;
 
 	/* since we use polling, disable interrupts */
 	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, &interrupt);
@@ -215,9 +216,10 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 
 static int fsi_i2c_set_port(struct fsi_i2c_port *port)
 {
-	int rc;
 	struct fsi_device *fsi = port->master->fsi;
-	u32 mode, dummy = 0;
+	u32 dummy = 0;
+	u32 mode;
+	int rc;
 
 	rc = fsi_i2c_read_reg(fsi, I2C_FSI_MODE, &mode);
 	if (rc)
@@ -238,7 +240,6 @@ static int fsi_i2c_set_port(struct fsi_i2c_port *port)
 static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			 bool stop)
 {
-	struct fsi_i2c_master *i2c = port->master;
 	u32 cmd = I2C_CMD_WITH_START | I2C_CMD_WITH_ADDR;
 
 	port->xfrd = 0;
@@ -252,7 +253,7 @@ static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg,
 	cmd |= FIELD_PREP(I2C_CMD_ADDR, msg->addr);
 	cmd |= FIELD_PREP(I2C_CMD_LEN, msg->len);
 
-	return fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, &cmd);
+	return fsi_i2c_write_reg(port->master->fsi, I2C_FSI_CMD, &cmd);
 }
 
 static int fsi_i2c_get_op_bytes(int op_bytes)
@@ -268,18 +269,17 @@ static int fsi_i2c_get_op_bytes(int op_bytes)
 static int fsi_i2c_write_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			      u8 fifo_count)
 {
+	int bytes_to_write = port->master->fifo_size - fifo_count;
+	int bytes_remaining = msg->len - port->xfrd;
 	int write;
 	int rc;
-	struct fsi_i2c_master *i2c = port->master;
-	int bytes_to_write = i2c->fifo_size - fifo_count;
-	int bytes_remaining = msg->len - port->xfrd;
 
 	bytes_to_write = min(bytes_to_write, bytes_remaining);
 
 	while (bytes_to_write) {
 		write = fsi_i2c_get_op_bytes(bytes_to_write);
 
-		rc = fsi_device_write(i2c->fsi, I2C_FSI_FIFO,
+		rc = fsi_device_write(port->master->fsi, I2C_FSI_FIFO,
 				      &msg->buf[port->xfrd], write);
 		if (rc)
 			return rc;
@@ -294,12 +294,11 @@ static int fsi_i2c_write_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			     u8 fifo_count)
 {
-	int read;
-	int rc;
-	struct fsi_i2c_master *i2c = port->master;
-	int bytes_to_read;
 	int xfr_remaining = msg->len - port->xfrd;
+	int bytes_to_read;
 	u32 dummy;
+	int read;
+	int rc;
 
 	bytes_to_read = min_t(int, fifo_count, xfr_remaining);
 
@@ -307,7 +306,7 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 		read = fsi_i2c_get_op_bytes(bytes_to_read);
 
 		if (xfr_remaining) {
-			rc = fsi_device_read(i2c->fsi, I2C_FSI_FIFO,
+			rc = fsi_device_read(port->master->fsi, I2C_FSI_FIFO,
 					     &msg->buf[port->xfrd], read);
 			if (rc)
 				return rc;
@@ -316,8 +315,8 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			xfr_remaining -= read;
 		} else {
 			/* no more buffer but data in fifo, need to clear it */
-			rc = fsi_device_read(i2c->fsi, I2C_FSI_FIFO, &dummy,
-					     read);
+			rc = fsi_device_read(port->master->fsi, I2C_FSI_FIFO,
+					     &dummy, read);
 			if (rc)
 				return rc;
 		}
@@ -330,85 +329,80 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 
 static int fsi_i2c_get_scl(struct i2c_adapter *adap)
 {
-	u32 stat = 0;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 stat;
 
-	fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
+	fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat);
 
 	return !!(stat & I2C_STAT_SCL_IN);
 }
 
 static void fsi_i2c_set_scl(struct i2c_adapter *adap, int val)
 {
-	u32 dummy = 0;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 dummy = 0;
 
 	if (val)
-		fsi_i2c_write_reg(i2c->fsi, I2C_FSI_SET_SCL, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SCL, &dummy);
 	else
-		fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_SCL, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SCL, &dummy);
 }
 
 static int fsi_i2c_get_sda(struct i2c_adapter *adap)
 {
-	u32 stat = 0;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 stat;
 
-	fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
+	fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat);
 
 	return !!(stat & I2C_STAT_SDA_IN);
 }
 
 static void fsi_i2c_set_sda(struct i2c_adapter *adap, int val)
 {
-	u32 dummy = 0;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 dummy = 0;
 
 	if (val)
-		fsi_i2c_write_reg(i2c->fsi, I2C_FSI_SET_SDA, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SDA, &dummy);
 	else
-		fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_SDA, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SDA, &dummy);
 }
 
 static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap)
 {
-	int rc;
-	u32 mode;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 mode;
+	int rc;
 
-	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+	rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_MODE, &mode);
 	if (rc)
 		return;
 
 	mode |= I2C_MODE_DIAG;
-	fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode);
 }
 
 static void fsi_i2c_unprepare_recovery(struct i2c_adapter *adap)
 {
-	int rc;
-	u32 mode;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *i2c = port->master;
+	u32 mode;
+	int rc;
 
-	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+	rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_MODE, &mode);
 	if (rc)
 		return;
 
 	mode &= ~I2C_MODE_DIAG;
-	fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode);
 }
 
 static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 			     struct fsi_i2c_port *port)
 {
+	u32 dummy = 0;
+	u32 stat;
 	int rc;
-	u32 stat, dummy = 0;
 
 	/* force bus reset, ignore errors */
 	i2c_recover_bus(&port->adapter);
@@ -439,8 +433,9 @@ static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 
 static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 {
+	u32 dummy = 0;
+	u32 mode;
 	int rc;
-	u32 mode, dummy = 0;
 
 	/* reset engine */
 	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, &dummy);
@@ -476,18 +471,17 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 
 static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
 {
-	int rc;
-	unsigned long start;
+	struct fsi_i2c_master *i2c = port->master;
 	u32 cmd = I2C_CMD_WITH_STOP;
+	unsigned long start;
 	u32 stat;
-	struct fsi_i2c_master *i2c = port->master;
-	struct fsi_device *fsi = i2c->fsi;
+	int rc;
 
 	rc = fsi_i2c_reset_engine(i2c, port->port);
 	if (rc)
 		return rc;
 
-	rc = fsi_i2c_read_reg(fsi, I2C_FSI_STAT, &stat);
+	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
 	if (rc)
 		return rc;
 
@@ -503,15 +497,14 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
 		return 0;
 
 	/* write stop command */
-	rc = fsi_i2c_write_reg(fsi, I2C_FSI_CMD, &cmd);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, &cmd);
 	if (rc)
 		return rc;
 
 	/* wait until we see command complete in the master */
 	start = jiffies;
-
 	do {
-		rc = fsi_i2c_read_reg(fsi, I2C_FSI_STAT, &status);
+		rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status);
 		if (rc)
 			return rc;
 
@@ -527,8 +520,8 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
 static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 				 struct i2c_msg *msg, u32 status)
 {
-	int rc;
 	u8 fifo_count;
+	int rc;
 
 	if (status & I2C_STAT_ERR) {
 		rc = fsi_i2c_abort(port, status);
@@ -576,9 +569,9 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			unsigned long timeout)
 {
-	u32 status = 0;
-	int rc;
 	unsigned long start = jiffies;
+	u32 status;
+	int rc;
 
 	do {
 		rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT,
@@ -608,13 +601,13 @@ static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg,
 static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 			int num)
 {
-	int i, rc;
-	unsigned long start_time;
 	struct fsi_i2c_port *port = adap->algo_data;
-	struct fsi_i2c_master *master = port->master;
+	unsigned long start_time;
 	struct i2c_msg *msg;
+	int rc;
+	int i;
 
-	mutex_lock(&master->lock);
+	mutex_lock(&port->master->lock);
 
 	rc = fsi_i2c_set_port(port);
 	if (rc)
@@ -635,7 +628,7 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 	}
 
 unlock:
-	mutex_unlock(&master->lock);
+	mutex_unlock(&port->master->lock);
 	return rc ? : num;
 }
 
@@ -681,8 +674,10 @@ static int fsi_i2c_probe(struct device *dev)
 	struct fsi_i2c_master *i2c;
 	struct fsi_i2c_port *port;
 	struct device_node *np;
-	u32 port_no, ports, stat;
+	u32 port_no;
+	u32 ports;
 	u32 lbus;
+	u32 stat;
 	int rc;
 
 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
@@ -752,14 +747,14 @@ static int fsi_i2c_probe(struct device *dev)
 	}
 
 	dev_set_drvdata(dev, i2c);
-
 	return 0;
 }
 
 static int fsi_i2c_remove(struct device *dev)
 {
 	struct fsi_i2c_master *i2c = dev_get_drvdata(dev);
-	struct fsi_i2c_port *port, *tmp;
+	struct fsi_i2c_port *port;
+	struct fsi_i2c_port *tmp;
 
 	list_for_each_entry_safe(port, tmp, &i2c->ports, list) {
 		list_del(&port->list);
-- 
2.39.3

[PATCH v3 28/40] i2c: fsi: Change fsi_i2c_write_reg to accept data instead of a pointer

[Eddie James]

There's no use passing a pointer here.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 47 +++++++++++++++---------------------
 1 file changed, 20 insertions(+), 27 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 8fb5b51b74a4d..44aa750278100 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -177,9 +177,9 @@ static int fsi_i2c_read_reg(struct fsi_device *fsi, unsigned int reg,
 }
 
 static int fsi_i2c_write_reg(struct fsi_device *fsi, unsigned int reg,
-			     u32 *data)
+			     u32 data)
 {
-	__be32 data_be = cpu_to_be32p(data);
+	__be32 data_be = cpu_to_be32(data);
 
 	return fsi_device_write(fsi, reg, &data_be, sizeof(data_be));
 }
@@ -188,17 +188,16 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 {
 	u32 mode = I2C_MODE_ENHANCED;
 	u32 extended_status;
-	u32 interrupt = 0;
 	u32 watermark;
 	int rc;
 
 	/* since we use polling, disable interrupts */
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, &interrupt);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, 0);
 	if (rc)
 		return rc;
 
 	mode |= FIELD_PREP(I2C_MODE_CLKDIV, i2c->clock_div);
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, mode);
 	if (rc)
 		return rc;
 
@@ -211,13 +210,12 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 			       i2c->fifo_size - I2C_FIFO_HI_LVL);
 	watermark |= FIELD_PREP(I2C_WATERMARK_LO, I2C_FIFO_LO_LVL);
 
-	return fsi_i2c_write_reg(i2c->fsi, I2C_FSI_WATER_MARK, &watermark);
+	return fsi_i2c_write_reg(i2c->fsi, I2C_FSI_WATER_MARK, watermark);
 }
 
 static int fsi_i2c_set_port(struct fsi_i2c_port *port)
 {
 	struct fsi_device *fsi = port->master->fsi;
-	u32 dummy = 0;
 	u32 mode;
 	int rc;
 
@@ -229,12 +227,12 @@ static int fsi_i2c_set_port(struct fsi_i2c_port *port)
 		return 0;
 
 	mode = (mode & ~I2C_MODE_PORT) | FIELD_PREP(I2C_MODE_PORT, port->port);
-	rc = fsi_i2c_write_reg(fsi, I2C_FSI_MODE, &mode);
+	rc = fsi_i2c_write_reg(fsi, I2C_FSI_MODE, mode);
 	if (rc)
 		return rc;
 
 	/* reset engine when port is changed */
-	return fsi_i2c_write_reg(fsi, I2C_FSI_RESET_ERR, &dummy);
+	return fsi_i2c_write_reg(fsi, I2C_FSI_RESET_ERR, 0);
 }
 
 static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg,
@@ -253,7 +251,7 @@ static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg,
 	cmd |= FIELD_PREP(I2C_CMD_ADDR, msg->addr);
 	cmd |= FIELD_PREP(I2C_CMD_LEN, msg->len);
 
-	return fsi_i2c_write_reg(port->master->fsi, I2C_FSI_CMD, &cmd);
+	return fsi_i2c_write_reg(port->master->fsi, I2C_FSI_CMD, cmd);
 }
 
 static int fsi_i2c_get_op_bytes(int op_bytes)
@@ -340,12 +338,11 @@ static int fsi_i2c_get_scl(struct i2c_adapter *adap)
 static void fsi_i2c_set_scl(struct i2c_adapter *adap, int val)
 {
 	struct fsi_i2c_port *port = adap->algo_data;
-	u32 dummy = 0;
 
 	if (val)
-		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SCL, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SCL, 0);
 	else
-		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SCL, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SCL, 0);
 }
 
 static int fsi_i2c_get_sda(struct i2c_adapter *adap)
@@ -361,12 +358,11 @@ static int fsi_i2c_get_sda(struct i2c_adapter *adap)
 static void fsi_i2c_set_sda(struct i2c_adapter *adap, int val)
 {
 	struct fsi_i2c_port *port = adap->algo_data;
-	u32 dummy = 0;
 
 	if (val)
-		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SDA, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SDA, 0);
 	else
-		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SDA, &dummy);
+		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_RESET_SDA, 0);
 }
 
 static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap)
@@ -380,7 +376,7 @@ static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap)
 		return;
 
 	mode |= I2C_MODE_DIAG;
-	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode);
+	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, mode);
 }
 
 static void fsi_i2c_unprepare_recovery(struct i2c_adapter *adap)
@@ -394,13 +390,12 @@ static void fsi_i2c_unprepare_recovery(struct i2c_adapter *adap)
 		return;
 
 	mode &= ~I2C_MODE_DIAG;
-	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, &mode);
+	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_MODE, mode);
 }
 
 static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 			     struct fsi_i2c_port *port)
 {
-	u32 dummy = 0;
 	u32 stat;
 	int rc;
 
@@ -408,7 +403,7 @@ static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 	i2c_recover_bus(&port->adapter);
 
 	/* reset errors */
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_ERR, &dummy);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_ERR, 0);
 	if (rc)
 		return rc;
 
@@ -423,7 +418,7 @@ static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 		return 0;
 
 	/* failed to get command complete; reset engine again */
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, &dummy);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, 0);
 	if (rc)
 		return rc;
 
@@ -433,12 +428,11 @@ static int fsi_i2c_reset_bus(struct fsi_i2c_master *i2c,
 
 static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 {
-	u32 dummy = 0;
 	u32 mode;
 	int rc;
 
 	/* reset engine */
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, &dummy);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_RESET_I2C, 0);
 	if (rc)
 		return rc;
 
@@ -455,14 +449,13 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 	if (port) {
 		mode &= ~I2C_MODE_PORT;
 		mode |= FIELD_PREP(I2C_MODE_PORT, port);
-		rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, &mode);
+		rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_MODE, mode);
 		if (rc)
 			return rc;
 	}
 
 	/* reset busy register; hw workaround */
-	dummy = I2C_PORT_BUSY_RESET;
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_PORT_BUSY, &dummy);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_PORT_BUSY, I2C_PORT_BUSY_RESET);
 	if (rc)
 		return rc;
 
@@ -497,7 +490,7 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
 		return 0;
 
 	/* write stop command */
-	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, &cmd);
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, cmd);
 	if (rc)
 		return rc;
 
-- 
2.39.3

[PATCH v3 29/40] i2c: fsi: Remove list structure of ports

[Eddie James]

Maintaining a list of ports is unnecessary since they can be managed
with the device resource framework.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 44 +++++++++---------------------------
 1 file changed, 11 insertions(+), 33 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 44aa750278100..f3b97bf88d0f9 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -19,7 +19,6 @@
 #include <linux/i2c.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
-#include <linux/list.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
@@ -148,14 +147,12 @@
 
 struct fsi_i2c_master {
 	struct fsi_device	*fsi;
-	struct list_head	ports;
 	struct mutex		lock;
 	u32			clock_div;
 	u8			fifo_size;
 };
 
 struct fsi_i2c_port {
-	struct list_head	list;
 	struct i2c_adapter	adapter;
 	struct fsi_i2c_master	*master;
 	u16			port;
@@ -327,7 +324,7 @@ static int fsi_i2c_read_fifo(struct fsi_i2c_port *port, struct i2c_msg *msg,
 
 static int fsi_i2c_get_scl(struct i2c_adapter *adap)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	u32 stat;
 
 	fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat);
@@ -337,7 +334,7 @@ static int fsi_i2c_get_scl(struct i2c_adapter *adap)
 
 static void fsi_i2c_set_scl(struct i2c_adapter *adap, int val)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 
 	if (val)
 		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SCL, 0);
@@ -347,7 +344,7 @@ static void fsi_i2c_set_scl(struct i2c_adapter *adap, int val)
 
 static int fsi_i2c_get_sda(struct i2c_adapter *adap)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	u32 stat;
 
 	fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &stat);
@@ -357,7 +354,7 @@ static int fsi_i2c_get_sda(struct i2c_adapter *adap)
 
 static void fsi_i2c_set_sda(struct i2c_adapter *adap, int val)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 
 	if (val)
 		fsi_i2c_write_reg(port->master->fsi, I2C_FSI_SET_SDA, 0);
@@ -367,7 +364,7 @@ static void fsi_i2c_set_sda(struct i2c_adapter *adap, int val)
 
 static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	u32 mode;
 	int rc;
 
@@ -381,7 +378,7 @@ static void fsi_i2c_prepare_recovery(struct i2c_adapter *adap)
 
 static void fsi_i2c_unprepare_recovery(struct i2c_adapter *adap)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	u32 mode;
 	int rc;
 
@@ -594,7 +591,7 @@ static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg,
 static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 			int num)
 {
-	struct fsi_i2c_port *port = adap->algo_data;
+	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	unsigned long start_time;
 	struct i2c_msg *msg;
 	int rc;
@@ -679,7 +676,6 @@ static int fsi_i2c_probe(struct device *dev)
 
 	mutex_init(&i2c->lock);
 	i2c->fsi = to_fsi_dev(dev);
-	INIT_LIST_HEAD(&i2c->ports);
 	i2c->clock_div = I2C_DEFAULT_CLK_DIV;
 
 	lbus = fsi_device_local_bus_frequency(i2c->fsi);
@@ -705,38 +701,30 @@ static int fsi_i2c_probe(struct device *dev)
 	ports = FIELD_GET(I2C_STAT_MAX_PORT, stat) + 1;
 	dev_dbg(dev, "I2C master has %d ports\n", ports);
 
-	for (port_no = 0; port_no < ports; port_no++) {
+	port = devm_kzalloc(dev, sizeof(*port) * ports, GFP_KERNEL);
+	for (port_no = 0; port_no < ports; port_no++, port++) {
 		np = fsi_i2c_find_port_of_node(dev->of_node, port_no);
 		if (!of_device_is_available(np))
 			continue;
 
-		port = kzalloc(sizeof(*port), GFP_KERNEL);
-		if (!port) {
-			of_node_put(np);
-			break;
-		}
-
 		port->master = i2c;
 		port->port = port_no;
 
+		i2c_set_adapdata(&port->adapter, port);
 		port->adapter.owner = THIS_MODULE;
 		port->adapter.dev.of_node = np;
 		port->adapter.dev.parent = dev;
 		port->adapter.algo = &fsi_i2c_algorithm;
 		port->adapter.bus_recovery_info = &fsi_i2c_bus_recovery_info;
-		port->adapter.algo_data = port;
 
 		snprintf(port->adapter.name, sizeof(port->adapter.name),
 			 "i2c_bus-%u", port_no);
 
-		rc = i2c_add_adapter(&port->adapter);
+		rc = devm_i2c_add_adapter(dev, &port->adapter);
 		if (rc < 0) {
 			dev_err(dev, "Failed to register adapter: %d\n", rc);
-			kfree(port);
 			continue;
 		}
-
-		list_add(&port->list, &i2c->ports);
 	}
 
 	dev_set_drvdata(dev, i2c);
@@ -745,16 +733,6 @@ static int fsi_i2c_probe(struct device *dev)
 
 static int fsi_i2c_remove(struct device *dev)
 {
-	struct fsi_i2c_master *i2c = dev_get_drvdata(dev);
-	struct fsi_i2c_port *port;
-	struct fsi_i2c_port *tmp;
-
-	list_for_each_entry_safe(port, tmp, &i2c->ports, list) {
-		list_del(&port->list);
-		i2c_del_adapter(&port->adapter);
-		kfree(port);
-	}
-
 	return 0;
 }
 
-- 
2.39.3

[PATCH v3 30/40] i2c: fsi: Define a function to check status error bits

[Eddie James]

This will be used more than once with interrupt support, so split
the error bit checks into a function.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 38 ++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index f3b97bf88d0f9..022f1287aa0e3 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -507,6 +507,26 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
 	return -ETIMEDOUT;
 }
 
+static int fsi_i2c_error_status_to_rc(u32 status)
+{
+	if (status & I2C_STAT_INV_CMD)
+		return -EINVAL;
+
+	if (status & (I2C_STAT_PARITY | I2C_STAT_BE_OVERRUN | I2C_STAT_BE_ACCESS))
+		return -EPROTO;
+
+	if (status & I2C_STAT_NACK)
+		return -ENXIO;
+
+	if (status & I2C_STAT_LOST_ARB)
+		return -EAGAIN;
+
+	if (status & I2C_STAT_STOP_ERR)
+		return -EBADMSG;
+
+	return -EIO;
+}
+
 static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 				 struct i2c_msg *msg, u32 status)
 {
@@ -518,23 +538,7 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 		if (rc)
 			return rc;
 
-		if (status & I2C_STAT_INV_CMD)
-			return -EINVAL;
-
-		if (status & (I2C_STAT_PARITY | I2C_STAT_BE_OVERRUN |
-		    I2C_STAT_BE_ACCESS))
-			return -EPROTO;
-
-		if (status & I2C_STAT_NACK)
-			return -ENXIO;
-
-		if (status & I2C_STAT_LOST_ARB)
-			return -EAGAIN;
-
-		if (status & I2C_STAT_STOP_ERR)
-			return -EBADMSG;
-
-		return -EIO;
+		return fsi_i2c_error_status_to_rc(status);
 	}
 
 	if (status & I2C_STAT_DAT_REQ) {
-- 
2.39.3

[PATCH v3 31/40] i2c: fsi: Add boolean for skip stop command on abort

[Eddie James]

In preparation for interrupt support, store whether to skip the
final stop command during the abort procedure instead of checking
the previously read status register in the abort function.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 022f1287aa0e3..614d830419bb8 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -116,6 +116,9 @@
 #define I2C_STAT_ANY_RESP	(I2C_STAT_ERR |				\
 				 I2C_STAT_DAT_REQ |			\
 				 I2C_STAT_CMD_COMP)
+#define I2C_STAT_SKIP_STOP	(I2C_STAT_PARITY |			\
+				 I2C_STAT_LOST_ARB |			\
+				 I2C_STAT_STOP_ERR)
 
 /* extended status register */
 #define I2C_ESTAT_FIFO_SZ	GENMASK(31, 24)
@@ -150,6 +153,7 @@ struct fsi_i2c_master {
 	struct mutex		lock;
 	u32			clock_div;
 	u8			fifo_size;
+	bool			skip_stop;
 };
 
 struct fsi_i2c_port {
@@ -459,31 +463,30 @@ static int fsi_i2c_reset_engine(struct fsi_i2c_master *i2c, u16 port)
 	return 0;
 }
 
-static int fsi_i2c_abort(struct fsi_i2c_port *port, u32 status)
+static int fsi_i2c_abort(struct fsi_i2c_port *port)
 {
 	struct fsi_i2c_master *i2c = port->master;
 	u32 cmd = I2C_CMD_WITH_STOP;
 	unsigned long start;
-	u32 stat;
+	u32 status;
 	int rc;
 
 	rc = fsi_i2c_reset_engine(i2c, port->port);
 	if (rc)
 		return rc;
 
-	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &stat);
+	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status);
 	if (rc)
 		return rc;
 
 	/* if sda is low, peform full bus reset */
-	if (!(stat & I2C_STAT_SDA_IN)) {
+	if (!(status & I2C_STAT_SDA_IN)) {
 		rc = fsi_i2c_reset_bus(i2c, port);
 		if (rc)
 			return rc;
 	}
 
-	/* skip final stop command for these errors */
-	if (status & (I2C_STAT_PARITY | I2C_STAT_LOST_ARB | I2C_STAT_STOP_ERR))
+	if (i2c->skip_stop)
 		return 0;
 
 	/* write stop command */
@@ -534,7 +537,8 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 	int rc;
 
 	if (status & I2C_STAT_ERR) {
-		rc = fsi_i2c_abort(port, status);
+		port->master->skip_stop = status & I2C_STAT_SKIP_STOP;
+		rc = fsi_i2c_abort(port);
 		if (rc)
 			return rc;
 
-- 
2.39.3

[PATCH v3 32/40] i2c: fsi: Add interrupt support

[Eddie James]

Optionally support interrupts from the I2C controller so that
the driver can wait rather than poll the status register.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/i2c/busses/i2c-fsi.c   | 215 ++++++++++++++++++++++++++++++---
 include/trace/events/i2c_fsi.h |  45 +++++++
 2 files changed, 245 insertions(+), 15 deletions(-)
 create mode 100644 include/trace/events/i2c_fsi.h

diff --git a/drivers/i2c/busses/i2c-fsi.c b/drivers/i2c/busses/i2c-fsi.c
index 614d830419bb8..f8d9bc178ef5b 100644
--- a/drivers/i2c/busses/i2c-fsi.c
+++ b/drivers/i2c/busses/i2c-fsi.c
@@ -23,6 +23,7 @@
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/slab.h>
+#include <linux/wait.h>
 
 #define FSI_ENGID_I2C		0x7
 
@@ -87,6 +88,7 @@
 #define I2C_INT_STOP_ERR	BIT(7)
 #define I2C_INT_BUSY		BIT(6)
 #define I2C_INT_IDLE		BIT(5)
+#define I2C_INT_ANY		GENMASK(15, 7)
 
 /* status register */
 #define I2C_STAT_INV_CMD	BIT(31)
@@ -148,21 +150,35 @@
 /* choose timeout length from legacy driver; it's well tested */
 #define I2C_ABORT_TIMEOUT	msecs_to_jiffies(100)
 
+struct fsi_i2c_port;
+
 struct fsi_i2c_master {
 	struct fsi_device	*fsi;
+	struct fsi_i2c_port	*port;
 	struct mutex		lock;
+	wait_queue_head_t	wait;
 	u32			clock_div;
 	u8			fifo_size;
+	bool			interrupts;
 	bool			skip_stop;
+	bool			abort;
 };
 
 struct fsi_i2c_port {
 	struct i2c_adapter	adapter;
 	struct fsi_i2c_master	*master;
+	struct i2c_msg		*msgs;
+	int			nmsgs;
+	int			rc;
+	int			i;
 	u16			port;
 	u16			xfrd;
+	bool			wake;
 };
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/i2c_fsi.h>
+
 static int fsi_i2c_read_reg(struct fsi_device *fsi, unsigned int reg,
 			    u32 *data)
 {
@@ -192,7 +208,7 @@ static int fsi_i2c_dev_init(struct fsi_i2c_master *i2c)
 	u32 watermark;
 	int rc;
 
-	/* since we use polling, disable interrupts */
+	/* start with interrupts disabled */
 	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, 0);
 	if (rc)
 		return rc;
@@ -236,22 +252,24 @@ static int fsi_i2c_set_port(struct fsi_i2c_port *port)
 	return fsi_i2c_write_reg(fsi, I2C_FSI_RESET_ERR, 0);
 }
 
-static int fsi_i2c_start(struct fsi_i2c_port *port, struct i2c_msg *msg,
-			 bool stop)
+static int fsi_i2c_start(struct fsi_i2c_port *port)
 {
 	u32 cmd = I2C_CMD_WITH_START | I2C_CMD_WITH_ADDR;
+	struct i2c_msg *msg = &port->msgs[port->i];
 
 	port->xfrd = 0;
 
 	if (msg->flags & I2C_M_RD)
 		cmd |= I2C_CMD_READ;
 
-	if (stop || msg->flags & I2C_M_STOP)
+	if ((port->i == (port->nmsgs - 1)) || (msg->flags & I2C_M_STOP))
 		cmd |= I2C_CMD_WITH_STOP;
 
 	cmd |= FIELD_PREP(I2C_CMD_ADDR, msg->addr);
 	cmd |= FIELD_PREP(I2C_CMD_LEN, msg->len);
 
+	trace_i2c_fsi_start(port, cmd);
+
 	return fsi_i2c_write_reg(port->master->fsi, I2C_FSI_CMD, cmd);
 }
 
@@ -489,11 +507,38 @@ static int fsi_i2c_abort(struct fsi_i2c_port *port)
 	if (i2c->skip_stop)
 		return 0;
 
+	if (i2c->interrupts) {
+		i2c->abort = true;
+		port->wake = false;
+
+		rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, I2C_INT_ANY);
+		if (rc)
+			return rc;
+	}
+
 	/* write stop command */
 	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_CMD, cmd);
 	if (rc)
 		return rc;
 
+	if (i2c->interrupts) {
+		rc = wait_event_interruptible_timeout(i2c->wait, port->wake, I2C_ABORT_TIMEOUT);
+		if (rc > 0)
+			return port->rc;
+
+		fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, 0);
+
+		if (!rc) {
+			rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status);
+			if (!rc && (status & I2C_STAT_CMD_COMP))
+				rc = 0;
+			else
+				rc = -ETIMEDOUT;
+		}
+
+		return rc;
+	}
+
 	/* wait until we see command complete in the master */
 	start = jiffies;
 	do {
@@ -564,8 +609,59 @@ static int fsi_i2c_handle_status(struct fsi_i2c_port *port,
 	return 0;
 }
 
-static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg,
-			unsigned long timeout)
+static int fsi_i2c_wait_irq(struct fsi_i2c_port *port, unsigned long timeout)
+{
+	int rc;
+
+	port->wake = false;
+
+	rc = fsi_i2c_write_reg(port->master->fsi, I2C_FSI_INT_MASK, I2C_INT_ANY);
+	if (rc)
+		return rc;
+
+	rc = wait_event_interruptible_timeout(port->master->wait, port->wake, timeout);
+	if (rc > 0) {
+		rc = port->rc;
+
+		if (port->master->abort) {
+			int rc2 = fsi_i2c_abort(port);
+
+			if (rc2)
+				return rc2;
+		}
+
+		return rc;
+	}
+
+	/*
+	 * The interrupt handler should turn off interrupts once it's done, but in this
+	 * case we timed out or were interrupted, so mask them off here.
+	 */
+	fsi_i2c_write_reg(port->master->fsi, I2C_FSI_INT_MASK, 0);
+
+	if (!rc) {
+		u32 status;
+
+		rc = fsi_i2c_read_reg(port->master->fsi, I2C_FSI_STAT, &status);
+		if (!rc && (status & I2C_STAT_ANY_RESP)) {
+			rc = fsi_i2c_handle_status(port, &port->msgs[port->i], status);
+			if (rc < 0)
+				return rc;
+
+			/* cmd complete and all data xfrd */
+			if (rc == port->msgs[port->i].len)
+				return 0;
+
+			rc = -ETIMEDOUT;
+		} else {
+			rc = -ETIMEDOUT;
+		}
+	}
+
+	return rc;
+}
+
+static int fsi_i2c_wait_poll(struct fsi_i2c_port *port, unsigned long timeout)
 {
 	unsigned long start = jiffies;
 	u32 status;
@@ -578,12 +674,12 @@ static int fsi_i2c_wait(struct fsi_i2c_port *port, struct i2c_msg *msg,
 			return rc;
 
 		if (status & I2C_STAT_ANY_RESP) {
-			rc = fsi_i2c_handle_status(port, msg, status);
+			rc = fsi_i2c_handle_status(port, &port->msgs[port->i], status);
 			if (rc < 0)
 				return rc;
 
 			/* cmd complete and all data xfrd */
-			if (rc == msg->len)
+			if (rc == port->msgs[port->i].len)
 				return 0;
 
 			/* need to xfr more data, but maybe don't need wait */
@@ -601,9 +697,7 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 {
 	struct fsi_i2c_port *port = i2c_get_adapdata(adap);
 	unsigned long start_time;
-	struct i2c_msg *msg;
 	int rc;
-	int i;
 
 	mutex_lock(&port->master->lock);
 
@@ -611,21 +705,28 @@ static int fsi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
 	if (rc)
 		goto unlock;
 
-	for (i = 0; i < num; i++) {
-		msg = msgs + i;
+	port->master->port = port;
+	port->master->abort = false;
+	port->msgs = msgs;
+	port->nmsgs = num;
+	for (port->i = 0; port->i < num; ++port->i) {
 		start_time = jiffies;
 
-		rc = fsi_i2c_start(port, msg, i == num - 1);
+		rc = fsi_i2c_start(port);
 		if (rc)
 			goto unlock;
 
-		rc = fsi_i2c_wait(port, msg,
-				  adap->timeout - (jiffies - start_time));
+		if (port->master->interrupts)
+			rc = fsi_i2c_wait_irq(port, adap->timeout - (jiffies - start_time));
+		else
+			rc = fsi_i2c_wait_poll(port, adap->timeout - (jiffies - start_time));
 		if (rc)
 			goto unlock;
 	}
 
 unlock:
+	port->msgs = NULL;
+	port->master->port = NULL;
 	mutex_unlock(&port->master->lock);
 	return rc ? : num;
 }
@@ -636,6 +737,85 @@ static u32 fsi_i2c_functionality(struct i2c_adapter *adap)
 		I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA;
 }
 
+static irqreturn_t fsi_i2c_irq(int irq, void *data)
+{
+	struct fsi_i2c_master *i2c = data;
+	struct fsi_i2c_port *port;
+	struct i2c_msg *msg;
+	u32 status;
+	int rc;
+
+	rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, 0);
+	if (rc)
+		return IRQ_NONE;
+
+	if (!i2c->port)
+		return IRQ_HANDLED;
+
+	port = i2c->port;
+	rc = fsi_i2c_read_reg(i2c->fsi, I2C_FSI_STAT, &status);
+	if (rc)
+		goto wake;
+
+	trace_i2c_fsi_irq(port, status);
+
+	if (i2c->abort) {
+		if (status & I2C_STAT_CMD_COMP) {
+			port->wake = true;
+			goto done;
+		} else {
+			rc = fsi_i2c_error_status_to_rc(status);
+			goto wake;
+		}
+	}
+
+	if (status & I2C_STAT_ERR) {
+		i2c->abort = true;
+		i2c->skip_stop = status & I2C_STAT_SKIP_STOP;
+		rc = fsi_i2c_error_status_to_rc(status);
+		goto wake;
+	}
+
+	if (!port->msgs || port->i >= port->nmsgs) {
+		rc = -ENODEV;
+		goto wake;
+	}
+
+	msg = &port->msgs[port->i];
+	if (status & I2C_STAT_DAT_REQ) {
+		u8 fifo_count = FIELD_GET(I2C_STAT_FIFO_COUNT, status);
+
+		if (msg->flags & I2C_M_RD)
+			rc = fsi_i2c_read_fifo(port, msg, fifo_count);
+		else
+			rc = fsi_i2c_write_fifo(port, msg, fifo_count);
+	} else if (status & I2C_STAT_CMD_COMP) {
+		if (port->xfrd < msg->len) {
+			rc = -ENODATA;
+		} else {
+			++port->i;
+			if (port->i < port->nmsgs) {
+				rc = fsi_i2c_start(port);
+			} else {
+				port->wake = true;
+				goto done;
+			}
+		}
+	}
+
+	if (!rc)
+		rc = fsi_i2c_write_reg(i2c->fsi, I2C_FSI_INT_MASK, I2C_INT_ANY);
+
+wake:
+	if (rc)
+		port->wake = true;
+done:
+	port->rc = rc;
+	if (port->wake)
+		wake_up_interruptible_all(&i2c->wait);
+	return IRQ_HANDLED;
+}
+
 static struct i2c_bus_recovery_info fsi_i2c_bus_recovery_info = {
 	.recover_bus = i2c_generic_scl_recovery,
 	.get_scl = fsi_i2c_get_scl,
@@ -683,6 +863,7 @@ static int fsi_i2c_probe(struct device *dev)
 		return -ENOMEM;
 
 	mutex_init(&i2c->lock);
+	init_waitqueue_head(&i2c->wait);
 	i2c->fsi = to_fsi_dev(dev);
 	i2c->clock_div = I2C_DEFAULT_CLK_DIV;
 
@@ -706,6 +887,10 @@ static int fsi_i2c_probe(struct device *dev)
 	if (rc)
 		return rc;
 
+	rc = fsi_device_request_irq(i2c->fsi, fsi_i2c_irq, i2c);
+	if (!rc)
+		i2c->interrupts = true;
+
 	ports = FIELD_GET(I2C_STAT_MAX_PORT, stat) + 1;
 	dev_dbg(dev, "I2C master has %d ports\n", ports);
 
diff --git a/include/trace/events/i2c_fsi.h b/include/trace/events/i2c_fsi.h
new file mode 100644
index 0000000000000..ac49ae9be356b
--- /dev/null
+++ b/include/trace/events/i2c_fsi.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM i2c_fsi
+
+#if !defined(_TRACE_I2C_FSI_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_I2C_FSI_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(i2c_fsi_irq,
+	TP_PROTO(const struct fsi_i2c_port *port, uint32_t status),
+	TP_ARGS(port, status),
+	TP_STRUCT__entry(
+		__field(int, bus)
+		__field(int, msg_idx)
+		__field(uint32_t, status)
+	),
+	TP_fast_assign(
+		__entry->bus = port->adapter.nr;
+		__entry->msg_idx = port->i;
+		__entry->status = status;
+	),
+	TP_printk("i2c-%d [%d] status:%08x", __entry->bus, __entry->msg_idx, __entry->status)
+);
+
+TRACE_EVENT(i2c_fsi_start,
+	TP_PROTO(const struct fsi_i2c_port *port, uint32_t command),
+	TP_ARGS(port, command),
+	TP_STRUCT__entry(
+		__field(int, bus)
+		__field(int, msg_idx)
+		__field(uint32_t, command)
+	),
+	TP_fast_assign(
+		__entry->bus = port->adapter.nr;
+		__entry->msg_idx = port->i;
+		__entry->command = command;
+	),
+	TP_printk("i2c-%d [%d] command:%08x", __entry->bus, __entry->msg_idx, __entry->command)
+);
+
+#endif
+
+#include <trace/define_trace.h>
-- 
2.39.3

[PATCH v3 33/40] fsi: hub master: Reset hub master after errors

[Eddie James]

The hub master driver wasn't clearing errors after accessing remote
slaves. Perform the standard master reset procedure to clear errors
to fully recover.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-hub.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/fsi/fsi-master-hub.c b/drivers/fsi/fsi-master-hub.c
index 4dbc542500bbd..1bd53b1e52a91 100644
--- a/drivers/fsi/fsi-master-hub.c
+++ b/drivers/fsi/fsi-master-hub.c
@@ -49,24 +49,34 @@ static int hub_master_read(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, void *val, size_t size)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(master);
+	int rc;
 
 	if (id != 0)
 		return -EINVAL;
 
 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
-	return fsi_slave_read(hub->upstream->slave, addr, val, size);
+	rc = fsi_slave_read(hub->upstream->slave, addr, val, size);
+	if (rc)
+		fsi_master_error(master, link);
+
+	return rc;
 }
 
 static int hub_master_write(struct fsi_master *master, int link,
 			uint8_t id, uint32_t addr, const void *val, size_t size)
 {
 	struct fsi_master_hub *hub = to_fsi_master_hub(master);
+	int rc;
 
 	if (id != 0)
 		return -EINVAL;
 
 	addr += hub->addr + (link * FSI_HUB_LINK_SIZE);
-	return fsi_slave_write(hub->upstream->slave, addr, val, size);
+	rc = fsi_slave_write(hub->upstream->slave, addr, val, size);
+	if (rc)
+		fsi_master_error(master, link);
+
+	return rc;
 }
 
 static int hub_master_break(struct fsi_master *master, int link)
-- 
2.39.3

[PATCH v3 34/40] fsi: core: Add master register read-only sysfs

[Eddie James]

The master registers are commonly used for debugging or diagnosis so
provide them in sysfs files.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c   | 144 +++++++++++++++++++++++++++++++++++++++
 drivers/fsi/fsi-master.h |   6 ++
 2 files changed, 150 insertions(+)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index ae65d87d4b13e..096b26c6421f2 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1392,6 +1392,141 @@ static ssize_t master_break_store(struct device *dev,
 
 static DEVICE_ATTR(break, 0200, NULL, master_break_store);
 
+struct fsi_master_attribute {
+	struct device_attribute attr;
+	int reg;
+};
+
+static ssize_t master_reg_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_master_attribute *fattr = container_of(attr, struct fsi_master_attribute, attr);
+	struct fsi_master *master = to_fsi_master(dev);
+	unsigned int reg;
+	int rc;
+	
+	rc = regmap_read(master->map, fattr->reg, &reg);
+	if (rc)
+		return rc;
+
+	return sysfs_emit(buf, "%08x\n", reg);
+}
+
+static ssize_t master_reg_1bpp_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_master_attribute *fattr = container_of(attr, struct fsi_master_attribute, attr);
+	struct fsi_master *master = to_fsi_master(dev);
+	unsigned int count = (master->n_links + 31) / 32;
+	unsigned int reg;
+	unsigned int i;
+	int len = 0;
+	int rc;
+	
+	for (i = 0; i < count; ++i) {
+		rc = regmap_read(master->map, fattr->reg + (i * 4), &reg);
+		if (rc)
+			return rc;
+
+		len += sysfs_emit_at(buf, len, "%08x\n", reg);
+	}
+
+	return len;
+}
+
+static ssize_t master_reg_4bpp_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_master_attribute *fattr = container_of(attr, struct fsi_master_attribute, attr);
+	struct fsi_master *master = to_fsi_master(dev);
+	unsigned int count = (master->n_links + 7) / 8;
+	unsigned int reg;
+	unsigned int i;
+	int len = 0;
+	int rc;
+	
+	for (i = 0; i < count; ++i) {
+		rc = regmap_read(master->map, fattr->reg + (i * 4), &reg);
+		if (rc)
+			return rc;
+
+		len += sysfs_emit_at(buf, len, "%08x\n", reg);
+	}
+
+	return len;
+}
+
+static ssize_t master_reg_32bpp_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_master_attribute *fattr = container_of(attr, struct fsi_master_attribute, attr);
+	struct fsi_master *master = to_fsi_master(dev);
+	unsigned int reg;
+	int len = 0;
+	int rc;
+	int i;
+	
+	for (i = 0; i < master->n_links; ++i) {
+		rc = regmap_read(master->map, fattr->reg + (i * 4), &reg);
+		if (rc)
+			return rc;
+
+		len += sysfs_emit_at(buf, len, "%08x\n", reg);
+	}
+
+	return len;
+}
+
+#define FSI_MASTER_ATTR(name, reg) \
+	struct fsi_master_attribute dev_attr_##name = { __ATTR(name, 0444, master_reg_show, NULL), reg }
+#define FSI_MASTER_ATTR_1BPP(name, reg) \
+	struct fsi_master_attribute dev_attr_##name = { __ATTR(name, 0444, master_reg_1bpp_show, NULL), reg }
+#define FSI_MASTER_ATTR_4BPP(name, reg) \
+	struct fsi_master_attribute dev_attr_##name = { __ATTR(name, 0444, master_reg_4bpp_show, NULL), reg }
+#define FSI_MASTER_ATTR_32BPP(name, reg) \
+	struct fsi_master_attribute dev_attr_##name = { __ATTR(name, 0444, master_reg_32bpp_show, NULL), reg }
+
+static FSI_MASTER_ATTR(mmode, FSI_MMODE);
+static FSI_MASTER_ATTR(mdlyr, FSI_MDLYR);
+static FSI_MASTER_ATTR_1BPP(mcrsp, FSI_MCRSP);
+static FSI_MASTER_ATTR_1BPP(menp, FSI_MENP0);
+static FSI_MASTER_ATTR_1BPP(mlevp, FSI_MLEVP0);
+static FSI_MASTER_ATTR_1BPP(mrefp, FSI_MREFP0);
+static FSI_MASTER_ATTR_1BPP(mhpmp, FSI_MHPMP0);
+static FSI_MASTER_ATTR_4BPP(msiep, FSI_MSIEP0);
+static FSI_MASTER_ATTR_1BPP(maesp, FSI_MAESP0);
+static FSI_MASTER_ATTR(maeb, FSI_MAEB);
+static FSI_MASTER_ATTR(mver, FSI_MVER);
+static FSI_MASTER_ATTR_1BPP(mbsyp, FSI_MBSYP0);
+static FSI_MASTER_ATTR_32BPP(mstap, FSI_MSTAP0);
+static FSI_MASTER_ATTR(mesrb, FSI_MESRB0);
+static FSI_MASTER_ATTR(mscsb, FSI_MSCSB0);
+static FSI_MASTER_ATTR(matrb, FSI_MATRB0);
+static FSI_MASTER_ATTR(mdtrb, FSI_MDTRB0);
+static FSI_MASTER_ATTR(mectrl, FSI_MECTRL);
+
+static struct attribute *master_mapped_attrs[] = {
+	&dev_attr_mmode.attr.attr,
+	&dev_attr_mdlyr.attr.attr,
+	&dev_attr_mcrsp.attr.attr,
+	&dev_attr_menp.attr.attr,
+	&dev_attr_mlevp.attr.attr,
+	&dev_attr_mrefp.attr.attr,
+	&dev_attr_mhpmp.attr.attr,
+	&dev_attr_msiep.attr.attr,
+	&dev_attr_maesp.attr.attr,
+	&dev_attr_maeb.attr.attr,
+	&dev_attr_mver.attr.attr,
+	&dev_attr_mbsyp.attr.attr,
+	&dev_attr_mstap.attr.attr,
+	&dev_attr_mesrb.attr.attr,
+	&dev_attr_mscsb.attr.attr,
+	&dev_attr_matrb.attr.attr,
+	&dev_attr_mdtrb.attr.attr,
+	&dev_attr_mectrl.attr.attr,
+	NULL
+};
+
+static const struct attribute_group master_mapped_group = {
+	.attrs = master_mapped_attrs,
+};
+
 static struct attribute *master_attrs[] = {
 	&dev_attr_break.attr,
 	&dev_attr_rescan.attr,
@@ -1665,6 +1800,12 @@ int fsi_master_register(struct fsi_master *master)
 	}
 out:
 	mutex_unlock(&master->scan_lock);
+
+	if (!rc && master->map) {
+		if (!sysfs_create_group(&master->dev.kobj, &master_mapped_group))
+			master->groups = true;
+	}
+
 	return rc;
 }
 EXPORT_SYMBOL_GPL(fsi_master_register);
@@ -1675,6 +1816,9 @@ void fsi_master_unregister(struct fsi_master *master)
 
 	trace_fsi_master_unregister(master);
 
+	if (master->groups)
+		sysfs_remove_group(&master->dev.kobj, &master_mapped_group);
+
 	mutex_lock(&master->scan_lock);
 	fsi_master_unscan(master);
 	master->n_links = 0;
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index 2104902091e05..1fa101a477899 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -12,6 +12,7 @@
 #include <linux/device.h>
 #include <linux/irq.h>
 #include <linux/mutex.h>
+#include <linux/sysfs.h>
 
 /*
  * Master registers
@@ -27,12 +28,16 @@
 #define FSI_MENP0		0x10		/* R/W: enable */
 #define FSI_MLEVP0		0x18		/* R: plug detect */
 #define FSI_MSENP0		0x18		/* S: Set enable */
+#define FSI_MREFP0		0x20		/* R: Plug reference */
 #define FSI_MCENP0		0x20		/* C: Clear enable */
+#define FSI_MHPMP0		0x28		/* R: Plug monitor */
 #define FSI_MSIEP0		0x30		/* R/W: interrupt enable */
+#define FSI_MAESP0		0x50		/* R: Any error port */
 #define FSI_MSSIEP0		0x50		/* S: Set interrupt enable */
 #define FSI_MCSIEP0		0x70		/* C: Clear interrupt enable */
 #define FSI_MAEB		0x70		/* R: Error address */
 #define FSI_MVER		0x74		/* R: master version/type */
+#define FSI_MBSYP0		0x78		/* R: Port busy */
 #define FSI_MSTAP0		0xd0		/* R: Port status */
 #define FSI_MRESP0		0xd0		/* W: Port reset */
 #define FSI_MESRB0		0x1d0		/* R: Master error status */
@@ -151,6 +156,7 @@ struct fsi_master {
 	int		(*link_config)(struct fsi_master *, int link,
 				       u8 t_send_delay, u8 t_echo_delay);
 	u8		remote_interrupt_status;
+	bool		groups;
 };
 
 #define to_fsi_master(d) container_of(d, struct fsi_master, dev)
-- 
2.39.3

[PATCH v3 35/40] fsi: core: Add slave register read-only sysfs

[Eddie James]

The slave registers are commonly used for debugging or diagnosis
so provide them in sysfs files.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c  | 144 +++++++++++++++++++++++++++++++++++++---
 drivers/fsi/fsi-slave.h |  21 ++++++
 2 files changed, 155 insertions(+), 10 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 096b26c6421f2..3d2bedb3ad51b 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -887,22 +887,146 @@ static ssize_t cfam_id_show(struct device *dev,
 
 static DEVICE_ATTR_RO(cfam_id);
 
-static struct attribute *cfam_attr[] = {
+static ssize_t config_table_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	const unsigned int end = engine_page_size / sizeof(u32);
+	struct fsi_slave *slave = to_fsi_slave(dev);
+	__be32 data;
+	int len = 0;
+	u32 conf;
+	int rc;
+
+	for (unsigned int i = 0; i < end; ++i) {
+		rc = fsi_slave_read(slave, i * sizeof(data), &data, sizeof(data));
+		if (rc)
+			return rc;
+
+		conf = be32_to_cpu(data);
+		if (crc4(0, conf, 32))
+			return -EBADMSG;
+
+		len += sysfs_emit_at(buf, len, "%08x\n", conf);
+		if (!(conf & FSI_SLAVE_CONF_NEXT_MASK))
+			break;
+	}
+
+	return len;
+}
+
+static DEVICE_ATTR_RO(config_table);
+
+struct fsi_slave_attribute {
+	struct device_attribute attr;
+	int reg;
+};
+
+static ssize_t slave_reg_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_slave_attribute *fattr = container_of(attr, struct fsi_slave_attribute, attr);
+	struct fsi_slave *slave = to_fsi_slave(dev);
+	__be32 data;
+	int rc;
+
+	rc = fsi_slave_read(slave, FSI_SLAVE_BASE + fattr->reg, &data, sizeof(data));
+	if (rc)
+		return rc;
+
+	return sysfs_emit(buf, "%08x\n", be32_to_cpu(data));
+}
+
+static ssize_t slave_reg_8bpp_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fsi_slave_attribute *fattr = container_of(attr, struct fsi_slave_attribute, attr);
+	struct fsi_slave *slave = to_fsi_slave(dev);
+	__be32 data;
+	int len = 0;
+	int rc;
+	int i;
+
+	for (i = 0; i < 2; ++i) {
+		rc = fsi_slave_read(slave, FSI_SLAVE_BASE + fattr->reg + (i * 4), &data,
+				    sizeof(data));
+		if (rc)
+			return rc;
+
+		len += sysfs_emit_at(buf, len, "%08x\n", be32_to_cpu(data));
+	}
+
+	return len;
+}
+
+#define FSI_SLAVE_ATTR(name, reg) \
+	struct fsi_slave_attribute dev_attr_##name = { __ATTR(name, 0444, slave_reg_show, NULL), reg }
+#define FSI_SLAVE_ATTR_8BPP(name, reg) \
+	struct fsi_slave_attribute dev_attr_##name = { __ATTR(name, 0444, slave_reg_8bpp_show, NULL), reg }
+
+static FSI_SLAVE_ATTR(smode, FSI_SMODE);
+static FSI_SLAVE_ATTR(sdma, FSI_SDMA);
+static FSI_SLAVE_ATTR(sisc, FSI_SISC);
+static FSI_SLAVE_ATTR(sism, FSI_SISM);
+static FSI_SLAVE_ATTR(siss, FSI_SISS);
+static FSI_SLAVE_ATTR(sstat, FSI_SSTAT);
+static FSI_SLAVE_ATTR(si1m, FSI_SI1M);
+static FSI_SLAVE_ATTR(si1s, FSI_SI1S);
+static FSI_SLAVE_ATTR(sic, FSI_SIC);
+static FSI_SLAVE_ATTR(si2m, FSI_SI2M);
+static FSI_SLAVE_ATTR(si2s, FSI_SI2S);
+static FSI_SLAVE_ATTR(scmdt, FSI_SCMDT);
+static FSI_SLAVE_ATTR(sdata, FSI_SDATA);
+static FSI_SLAVE_ATTR(slastd, FSI_SLASTD);
+static FSI_SLAVE_ATTR(smbl, FSI_SMBL);
+static FSI_SLAVE_ATTR(soml, FSI_SOML);
+static FSI_SLAVE_ATTR(snml, FSI_SNML);
+static FSI_SLAVE_ATTR(smbr, FSI_SMBR);
+static FSI_SLAVE_ATTR(somr, FSI_SOMR);
+static FSI_SLAVE_ATTR(snmr, FSI_SNMR);
+static FSI_SLAVE_ATTR_8BPP(scrsic, FSI_ScRSIC0);
+static FSI_SLAVE_ATTR_8BPP(scrsim, FSI_ScRSIM0);
+static FSI_SLAVE_ATTR_8BPP(scrsis, FSI_ScRSIS0);
+static FSI_SLAVE_ATTR_8BPP(srsic, FSI_SRSIC0);
+static FSI_SLAVE_ATTR_8BPP(srsim, FSI_SRSIM0);
+static FSI_SLAVE_ATTR_8BPP(srsis, FSI_SRSIS0);
+static FSI_SLAVE_ATTR(llmode, FSI_LLMODE);
+static FSI_SLAVE_ATTR(llstat, FSI_LLSTAT);
+
+static struct attribute *cfam_attrs[] = {
 	&dev_attr_send_echo_delays.attr,
 	&dev_attr_chip_id.attr,
 	&dev_attr_cfam_id.attr,
 	&dev_attr_send_term.attr,
+	&dev_attr_config_table.attr,
+	&dev_attr_smode.attr.attr,
+	&dev_attr_sdma.attr.attr,
+	&dev_attr_sisc.attr.attr,
+	&dev_attr_sism.attr.attr,
+	&dev_attr_siss.attr.attr,
+	&dev_attr_sstat.attr.attr,
+	&dev_attr_si1m.attr.attr,
+	&dev_attr_si1s.attr.attr,
+	&dev_attr_sic.attr.attr,
+	&dev_attr_si2m.attr.attr,
+	&dev_attr_si2s.attr.attr,
+	&dev_attr_scmdt.attr.attr,
+	&dev_attr_sdata.attr.attr,
+	&dev_attr_slastd.attr.attr,
+	&dev_attr_smbl.attr.attr,
+	&dev_attr_soml.attr.attr,
+	&dev_attr_snml.attr.attr,
+	&dev_attr_smbr.attr.attr,
+	&dev_attr_somr.attr.attr,
+	&dev_attr_snmr.attr.attr,
+	&dev_attr_scrsic.attr.attr,
+	&dev_attr_scrsim.attr.attr,
+	&dev_attr_scrsis.attr.attr,
+	&dev_attr_srsic.attr.attr,
+	&dev_attr_srsim.attr.attr,
+	&dev_attr_srsis.attr.attr,
+	&dev_attr_llmode.attr.attr,
+	&dev_attr_llstat.attr.attr,
 	NULL,
 };
 
-static const struct attribute_group cfam_attr_group = {
-	.attrs = cfam_attr,
-};
-
-static const struct attribute_group *cfam_attr_groups[] = {
-	&cfam_attr_group,
-	NULL,
-};
+ATTRIBUTE_GROUPS(cfam);
 
 static char *cfam_devnode(const struct device *dev, umode_t *mode,
 			  kuid_t *uid, kgid_t *gid)
@@ -919,7 +1043,7 @@ static char *cfam_devnode(const struct device *dev, umode_t *mode,
 static const struct device_type cfam_type = {
 	.name = "cfam",
 	.devnode = cfam_devnode,
-	.groups = cfam_attr_groups
+	.groups = cfam_groups
 };
 
 static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode,
diff --git a/drivers/fsi/fsi-slave.h b/drivers/fsi/fsi-slave.h
index 0468ec1c60db2..1478ee561b85c 100644
--- a/drivers/fsi/fsi-slave.h
+++ b/drivers/fsi/fsi-slave.h
@@ -14,6 +14,7 @@
  * FSI slave engine control register offsets
  */
 #define FSI_SMODE		0x0	/* R/W: Mode register */
+#define FSI_SDMA		0x4	/* R/W: DMA control */
 #define FSI_SISC		0x8	/* R  : Interrupt condition */
 #define FSI_SCISC		0x8	/* C  : Clear interrupt condition */
 #define FSI_SISM		0xc	/* R/W: Interrupt mask */
@@ -21,11 +22,30 @@
 #define FSI_SSISM		0x10	/* S  : Set interrupt mask */
 #define FSI_SCISM		0x14	/* C  : Clear interrupt mask */
 #define FSI_SSTAT		0x14	/* R  : Slave status */
+#define FSI_SI1M		0x18	/* R/W: Interrupt 1 mask */
 #define FSI_SI1S		0x1c	/* R  : Slave interrupt 1 status */
 #define FSI_SSI1M		0x1c	/* S  : Set slave interrupt 1 mask */
+#define FSI_SIC			0x20	/* R  : Interrupt 1 condition */
 #define FSI_SCI1M		0x20	/* C  : Clear slave interrupt 1 mask */
+#define FSI_SI2M		0x24	/* R/W: Interrupt 2 mask */
+#define FSI_SI2S		0x28	/* R  : Interrupt 2 status */
+#define FSI_SCMDT		0x2c	/* R  : Last command trace */
+#define FSI_SDATA		0x30	/* R  : Last data trace */
 #define FSI_SLBUS		0x30	/* W  : LBUS Ownership */
+#define FSI_SLASTD		0x34	/* R  : Last data sent */
 #define FSI_SRES		0x34	/* W  : Reset */
+#define FSI_SMBL		0x38
+#define FSI_SOML		0x3c
+#define FSI_SNML		0x40
+#define FSI_SMBR		0x44
+#define FSI_SOMR		0x48
+#define FSI_SNMR		0x4c
+#define FSI_ScRSIC0		0x50
+#define FSI_ScRSIC4		0x54
+#define FSI_ScRSIM0		0x58
+#define FSI_ScRSIM4		0x5c
+#define FSI_ScRSIS0		0x60
+#define FSI_ScRSIS4		0x64
 #define FSI_SRSIC0		0x68	/* C  : Clear remote interrupt condition */
 #define FSI_SRSIC4		0x6c	/* C  : Clear remote interrupt condition */
 #define FSI_SRSIM0		0x70	/* R/W: Remote interrupt mask */
@@ -33,6 +53,7 @@
 #define FSI_SRSIS0		0x78	/* R  : Remote interrupt status */
 #define FSI_SRSIS4		0x7c	/* R  : Remote interrupt status */
 #define FSI_LLMODE		0x100	/* R/W: Link layer mode register */
+#define FSI_LLSTAT		0x104
 
 /*
  * SMODE fields
-- 
2.39.3

[PATCH v3 36/40] fsi: i2cr: Adjust virtual CFAM ID to match Odyssey chip

[Eddie James]

The CFAM ID for the I2CR should be the same as the Odyssey chip.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-master-i2cr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fsi/fsi-master-i2cr.c b/drivers/fsi/fsi-master-i2cr.c
index 40f1f4d231e52..c032ba7938815 100644
--- a/drivers/fsi/fsi-master-i2cr.c
+++ b/drivers/fsi/fsi-master-i2cr.c
@@ -22,7 +22,7 @@
 #define I2CR_LOG_CMD		0x60008
 
 static const u8 i2cr_cfam[] = {
-	0xc0, 0x02, 0x0d, 0xa6,
+	0xc0, 0x01, 0x0c, 0x07,
 	0x80, 0x01, 0x10, 0x02,
 	0x80, 0x01, 0x10, 0x02,
 	0x80, 0x01, 0x10, 0x02,
-- 
2.39.3

[PATCH v3 37/40] fsi: core: Add different types of CFAM

[Eddie James]

Detect the CFAM type based on the chip id and set up the device
type based on the CFAM type.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/fsi/fsi-core.c | 84 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 3d2bedb3ad51b..2785812a7d4ad 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -1028,6 +1028,37 @@ static struct attribute *cfam_attrs[] = {
 
 ATTRIBUTE_GROUPS(cfam);
 
+static struct attribute *cfam_s_attrs[] = {
+	&dev_attr_send_echo_delays.attr,
+	&dev_attr_chip_id.attr,
+	&dev_attr_cfam_id.attr,
+	&dev_attr_send_term.attr,
+	&dev_attr_config_table.attr,
+	&dev_attr_smode.attr.attr,
+	&dev_attr_sdma.attr.attr,
+	&dev_attr_sisc.attr.attr,
+	&dev_attr_sism.attr.attr,
+	&dev_attr_siss.attr.attr,
+	&dev_attr_sstat.attr.attr,
+	&dev_attr_si1m.attr.attr,
+	&dev_attr_si1s.attr.attr,
+	&dev_attr_sic.attr.attr,
+	&dev_attr_si2m.attr.attr,
+	&dev_attr_si2s.attr.attr,
+	&dev_attr_scmdt.attr.attr,
+	&dev_attr_sdata.attr.attr,
+	&dev_attr_slastd.attr.attr,
+	&dev_attr_smbl.attr.attr,
+	&dev_attr_soml.attr.attr,
+	&dev_attr_snml.attr.attr,
+	&dev_attr_smbr.attr.attr,
+	&dev_attr_somr.attr.attr,
+	&dev_attr_snmr.attr.attr,
+	NULL,
+};
+
+ATTRIBUTE_GROUPS(cfam_s);
+
 static char *cfam_devnode(const struct device *dev, umode_t *mode,
 			  kuid_t *uid, kgid_t *gid)
 {
@@ -1046,6 +1077,57 @@ static const struct device_type cfam_type = {
 	.groups = cfam_groups
 };
 
+static char *cfam_ody_devnode(const struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+	const struct fsi_slave *slave = to_fsi_slave(dev);
+
+#ifdef CONFIG_FSI_NEW_DEV_NODE
+	return kasprintf(GFP_KERNEL, "fsi/ody%d", slave->cdev_idx);
+#else
+	return kasprintf(GFP_KERNEL, "ody%d", slave->cdev_idx);
+#endif
+}
+
+static const struct device_type cfam_ody_type = {
+	.name = "ody",
+	.devnode = cfam_ody_devnode
+};
+
+static char *cfam_s_devnode(const struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid)
+{
+	const struct fsi_slave *slave = to_fsi_slave(dev);
+
+#ifdef CONFIG_FSI_NEW_DEV_NODE
+	return kasprintf(GFP_KERNEL, "fsi/cfam-s%d", slave->cdev_idx);
+#else
+	return kasprintf(GFP_KERNEL, "cfam-s%d", slave->cdev_idx);
+#endif
+}
+
+static const struct device_type cfam_s_type = {
+	.name = "cfam-s",
+	.devnode = cfam_s_devnode,
+	.groups = cfam_s_groups,
+};
+
+const struct device_type *fsi_get_cfam_type(u32 id)
+{
+	u32 major = (id & 0xf00) >> 8;
+	u32 minor = (id & 0xf0) >> 4;
+
+	switch (major) {
+	case 0x9:
+		return &cfam_s_type;
+	case 0xc:
+		if (minor == 0)
+			return &cfam_ody_type;
+		fallthrough;
+	case 0xd:
+	default:
+		return &cfam_type;
+	}
+}
+
 static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode,
 			      kuid_t *uid, kgid_t *gid)
 {
@@ -1202,7 +1284,7 @@ static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
 
 	spin_lock_init(&slave->lock);
 	dev_set_name(&slave->dev, "slave@%02x:%02x", link, id);
-	slave->dev.type = &cfam_type;
+	slave->dev.type = fsi_get_cfam_type(cfam_id);
 	slave->dev.parent = &master->dev;
 	slave->dev.of_node = fsi_slave_find_of_node(master, link, id);
 	slave->dev.release = fsi_slave_release;
-- 
2.39.3

Re: [PATCH v3 37/40] fsi: core: Add different types of CFAM

[kernel test robot]

Hi Eddie,

kernel test robot noticed the following build warnings:

[auto build test WARNING on andi-shyti/i2c/i2c-host]
[also build test WARNING on robh/for-next broonie-spi/for-next linus/master v6.9 next-20240517]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eddie-James/fsi-hub-Set-master-index-to-link-number-plus-one/20240517-023205
base:   git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20240516181907.3468796-38-eajames%40linux.ibm.com
patch subject: [PATCH v3 37/40] fsi: core: Add different types of CFAM
config: i386-buildonly-randconfig-002-20240517 (https://download.01.org/0day-ci/archive/20240517/202405172019.j3pOURPP-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240517/202405172019.j3pOURPP-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405172019.j3pOURPP-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/fsi/fsi-core.c:1113:27: warning: no previous prototype for function 'fsi_get_cfam_type' [-Wmissing-prototypes]
    1113 | const struct device_type *fsi_get_cfam_type(u32 id)
         |                           ^
   drivers/fsi/fsi-core.c:1113:7: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1113 | const struct device_type *fsi_get_cfam_type(u32 id)
         |       ^
         | static 
   1 warning generated.


vim +/fsi_get_cfam_type +1113 drivers/fsi/fsi-core.c

  1112	
> 1113	const struct device_type *fsi_get_cfam_type(u32 id)
  1114	{
  1115		u32 major = (id & 0xf00) >> 8;
  1116		u32 minor = (id & 0xf0) >> 4;
  1117	
  1118		switch (major) {
  1119		case 0x9:
  1120			return &cfam_s_type;
  1121		case 0xc:
  1122			if (minor == 0)
  1123				return &cfam_ody_type;
  1124			fallthrough;
  1125		case 0xd:
  1126		default:
  1127			return &cfam_type;
  1128		}
  1129	}
  1130	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v3 37/40] fsi: core: Add different types of CFAM

[kernel test robot]

Hi Eddie,

kernel test robot noticed the following build warnings:

[auto build test WARNING on andi-shyti/i2c/i2c-host]
[also build test WARNING on linus/master v6.9 next-20240517]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eddie-James/fsi-hub-Set-master-index-to-link-number-plus-one/20240517-023205
base:   git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20240516181907.3468796-38-eajames%40linux.ibm.com
patch subject: [PATCH v3 37/40] fsi: core: Add different types of CFAM
config: x86_64-randconfig-122-20240517 (https://download.01.org/0day-ci/archive/20240517/202405172346.olJbkgod-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240517/202405172346.olJbkgod-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405172346.olJbkgod-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/fsi/fsi-core.c:1113:26: sparse: sparse: symbol 'fsi_get_cfam_type' was not declared. Should it be static?

vim +/fsi_get_cfam_type +1113 drivers/fsi/fsi-core.c

  1112	
> 1113	const struct device_type *fsi_get_cfam_type(u32 id)
  1114	{
  1115		u32 major = (id & 0xf00) >> 8;
  1116		u32 minor = (id & 0xf0) >> 4;
  1117	
  1118		switch (major) {
  1119		case 0x9:
  1120			return &cfam_s_type;
  1121		case 0xc:
  1122			if (minor == 0)
  1123				return &cfam_ody_type;
  1124			fallthrough;
  1125		case 0xd:
  1126		default:
  1127			return &cfam_type;
  1128		}
  1129	}
  1130	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: [PATCH v3 37/40] fsi: core: Add different types of CFAM

[kernel test robot]

Hi Eddie,

kernel test robot noticed the following build warnings:

[auto build test WARNING on andi-shyti/i2c/i2c-host]
[also build test WARNING on robh/for-next broonie-spi/for-next linus/master v6.9 next-20240517]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Eddie-James/fsi-hub-Set-master-index-to-link-number-plus-one/20240517-023205
base:   git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20240516181907.3468796-38-eajames%40linux.ibm.com
patch subject: [PATCH v3 37/40] fsi: core: Add different types of CFAM
config: nios2-randconfig-r071-20240517 (https://download.01.org/0day-ci/archive/20240518/202405180824.hYqwNWNv-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240518/202405180824.hYqwNWNv-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405180824.hYqwNWNv-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/fsi/fsi-core.c:1113:27: warning: no previous prototype for 'fsi_get_cfam_type' [-Wmissing-prototypes]
    1113 | const struct device_type *fsi_get_cfam_type(u32 id)
         |                           ^~~~~~~~~~~~~~~~~


vim +/fsi_get_cfam_type +1113 drivers/fsi/fsi-core.c

  1112	
> 1113	const struct device_type *fsi_get_cfam_type(u32 id)
  1114	{
  1115		u32 major = (id & 0xf00) >> 8;
  1116		u32 minor = (id & 0xf0) >> 4;
  1117	
  1118		switch (major) {
  1119		case 0x9:
  1120			return &cfam_s_type;
  1121		case 0xc:
  1122			if (minor == 0)
  1123				return &cfam_ody_type;
  1124			fallthrough;
  1125		case 0xd:
  1126		default:
  1127			return &cfam_type;
  1128		}
  1129	}
  1130	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

[PATCH v3 38/40] spi: fsi: Calculate clock divider from local bus frequency

[Eddie James]

Use the new FSI device local bus clock to calculate the proper SPI
clock divider.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/spi/spi-fsi.c | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c
index fc9e33be1e0e7..e762690f1a390 100644
--- a/drivers/spi/spi-fsi.c
+++ b/drivers/spi/spi-fsi.c
@@ -40,6 +40,7 @@
 #define  SPI_FSI_CLOCK_CFG_SCK_RECV_DEL	 GENMASK_ULL(51, 44)
 #define   SPI_FSI_CLOCK_CFG_SCK_NO_DEL	  BIT_ULL(51)
 #define  SPI_FSI_CLOCK_CFG_SCK_DIV	 GENMASK_ULL(63, 52)
+#define  SPI_FSI_CLOCK_CFG_SCK_DIV_MIN	  0x4
 #define SPI_FSI_MMAP			0x4
 #define SPI_FSI_DATA_TX			0x5
 #define SPI_FSI_DATA_RX			0x6
@@ -70,6 +71,7 @@
 struct fsi2spi {
 	struct fsi_device *fsi; /* FSI2SPI CFAM engine device */
 	struct mutex lock; /* lock access to the device */
+	u32 lbus_freq;
 };
 
 struct fsi_spi {
@@ -359,7 +361,7 @@ static int fsi_spi_transfer_data(struct fsi_spi *ctx,
 	return 0;
 }
 
-static int fsi_spi_transfer_init(struct fsi_spi *ctx)
+static int fsi_spi_transfer_init(struct fsi_spi *ctx, u32 clock_div)
 {
 	int loops = 0;
 	int rc;
@@ -370,7 +372,7 @@ static int fsi_spi_transfer_init(struct fsi_spi *ctx)
 	u64 status = 0ULL;
 	u64 wanted_clock_cfg = SPI_FSI_CLOCK_CFG_ECC_DISABLE |
 		SPI_FSI_CLOCK_CFG_SCK_NO_DEL |
-		FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 19);
+		FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, clock_div);
 
 	end = jiffies + msecs_to_jiffies(SPI_FSI_TIMEOUT_MS);
 	do {
@@ -421,6 +423,24 @@ static int fsi_spi_transfer_init(struct fsi_spi *ctx)
 	return rc;
 }
 
+static u32 fsi_spi_calculate_clock_div(struct fsi2spi *bridge, struct spi_device *dev,
+				       struct spi_transfer *transfer)
+{
+	u32 div = 19;
+
+	if (bridge->lbus_freq) {
+		u32 desired_speed_hz = transfer->speed_hz ?: dev->max_speed_hz;
+
+		div = DIV_ROUND_UP(bridge->lbus_freq, desired_speed_hz);
+		if (div < SPI_FSI_CLOCK_CFG_SCK_DIV_MIN)
+			div = SPI_FSI_CLOCK_CFG_SCK_DIV_MIN;
+
+		transfer->effective_speed_hz = bridge->lbus_freq / div;
+	}
+
+	return div;
+}
+
 static int fsi_spi_transfer_one_message(struct spi_controller *ctlr,
 					struct spi_message *mesg)
 {
@@ -429,6 +449,7 @@ static int fsi_spi_transfer_one_message(struct spi_controller *ctlr,
 	unsigned int len;
 	struct spi_transfer *transfer;
 	struct fsi_spi *ctx = spi_controller_get_devdata(ctlr);
+	u32 div;
 
 	rc = fsi_spi_check_mux(ctx->bridge->fsi, ctx->dev);
 	if (rc)
@@ -446,7 +467,8 @@ static int fsi_spi_transfer_one_message(struct spi_controller *ctlr,
 
 		dev_dbg(ctx->dev, "Start tx of %d bytes.\n", transfer->len);
 
-		rc = fsi_spi_transfer_init(ctx);
+		div = fsi_spi_calculate_clock_div(ctx->bridge, mesg->spi, transfer);
+		rc = fsi_spi_transfer_init(ctx, div);
 		if (rc < 0)
 			goto error;
 
@@ -533,6 +555,7 @@ static int fsi_spi_probe(struct device *dev)
 
 	bridge->fsi = fsi;
 	mutex_init(&bridge->lock);
+	bridge->lbus_freq = fsi_device_local_bus_frequency(fsi);
 
 	for_each_available_child_of_node(dev->of_node, np) {
 		u32 base;
@@ -550,6 +573,10 @@ static int fsi_spi_probe(struct device *dev)
 
 		ctlr->dev.of_node = np;
 		ctlr->num_chipselect = of_get_available_child_count(np) ?: 1;
+		if (bridge->lbus_freq) {
+			ctlr->min_speed_hz = DIV_ROUND_UP(bridge->lbus_freq, 0xfff);
+			ctlr->max_speed_hz = bridge->lbus_freq / SPI_FSI_CLOCK_CFG_SCK_DIV_MIN;
+		}
 		ctlr->flags = SPI_CONTROLLER_HALF_DUPLEX;
 		ctlr->max_transfer_size = fsi_spi_max_transfer_size;
 		ctlr->transfer_one_message = fsi_spi_transfer_one_message;
-- 
2.39.3

Re: [PATCH v3 38/40] spi: fsi: Calculate clock divider from local bus frequency

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 190 bytes --]

On Thu, May 16, 2024 at 01:19:05PM -0500, Eddie James wrote:
> Use the new FSI device local bus clock to calculate the proper SPI
> clock divider.

Acked-by: Mark Brown <broonie@kernel.org>

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[PATCH v3 39/40] ARM: dts: aspeed: P10 and tacoma: Set FSI clock frequency

[Eddie James]

Now that the driver doesn't hardcode the clock divider, set it
in the device tree.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 arch/arm/boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts | 1 +
 arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts
index 213023bc5aec4..96a8f727bc389 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-opp-tacoma.dts
@@ -193,6 +193,7 @@ &fsim0 {
 	#address-cells = <2>;
 	#size-cells = <0>;
 
+	clock-frequency = <100000000>;
 	fsi-routing-gpios = <&gpio0 ASPEED_GPIO(Q, 7) GPIO_ACTIVE_HIGH>;
 	fsi-mux-gpios = <&gpio0 ASPEED_GPIO(B, 0) GPIO_ACTIVE_HIGH>;
 
diff --git a/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi b/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
index 07ce3b2bc62a3..44e48e39e6e96 100644
--- a/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
+++ b/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
@@ -8,6 +8,7 @@ &fsim0 {
 	#size-cells = <0>;
 
 	cfam-reset-gpios = <&gpio0 ASPEED_GPIO(Q, 0) GPIO_ACTIVE_HIGH>;
+	clock-frequency = <100000000>;
 
 	cfam@0,0 {
 		reg = <0 0>;
-- 
2.39.3

[PATCH v3 40/40] ARM: dts: aspeed: P10: Bump SPI max frequencies

[Eddie James]

These parts support 10MHZ.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 .../dts/aspeed/aspeed-bmc-ibm-everest.dts     | 32 +++++++++----------
 .../arm/boot/dts/aspeed/ibm-power10-dual.dtsi | 16 +++++-----
 .../arm/boot/dts/aspeed/ibm-power10-quad.dtsi | 16 +++++-----
 3 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-everest.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-everest.dts
index 214b2e6a4c6df..1365dc95f1352 100644
--- a/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-everest.dts
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-ibm-everest.dts
@@ -2797,7 +2797,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -2813,7 +2813,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -2830,7 +2830,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -2847,7 +2847,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
@@ -3170,7 +3170,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3186,7 +3186,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3203,7 +3203,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3220,7 +3220,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
@@ -3543,7 +3543,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3559,7 +3559,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3576,7 +3576,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3593,7 +3593,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
@@ -3916,7 +3916,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3932,7 +3932,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3949,7 +3949,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -3966,7 +3966,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
diff --git a/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi b/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
index 44e48e39e6e96..e11354bb384c2 100644
--- a/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
+++ b/arch/arm/boot/dts/aspeed/ibm-power10-dual.dtsi
@@ -94,7 +94,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -110,7 +110,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -127,7 +127,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -144,7 +144,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
@@ -261,7 +261,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -277,7 +277,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -294,7 +294,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -311,7 +311,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
diff --git a/arch/arm/boot/dts/aspeed/ibm-power10-quad.dtsi b/arch/arm/boot/dts/aspeed/ibm-power10-quad.dtsi
index 57494c744b5d0..0ffb4ae6423fc 100644
--- a/arch/arm/boot/dts/aspeed/ibm-power10-quad.dtsi
+++ b/arch/arm/boot/dts/aspeed/ibm-power10-quad.dtsi
@@ -744,7 +744,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -760,7 +760,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -777,7 +777,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -794,7 +794,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
@@ -1117,7 +1117,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -1133,7 +1133,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -1150,7 +1150,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 
@@ -1167,7 +1167,7 @@ eeprom@0 {
 
 					compatible = "atmel,at25";
 					reg = <0>;
-					spi-max-frequency = <1000000>;
+					spi-max-frequency = <10000000>;
 				};
 			};
 		};
-- 
2.39.3