[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[Jan Luebbe]

This series adds drivers for the L2 cache and DDR RAM ECC functionality as
found on the MV78230/MV78x60 SoCs. I've tested these changes with the MV78460
(on a custom board with a DDR3 ECC DIMM).

Also contained in this series are an additional debugfs wrapper and devm_
helpers for edac_mc_/edac_device_ allocation and registration, which make error
handing and cleanup simpler.

Compared to the previous v1 series, the following changes have been made:
- Add the aurora-l2 register defines earlier in the series (suggested by
  Russell King and Gregory CLEMENT )
- Changed the DT vendor prefix from "arm" to "marvell" for the ecc-enable/disable
  properties on the aurora-l2 (suggested by Russell King)
- Fix some warnings reported by checkpatch

Compared to the original RFC series, the following changes have been made:
- Integrated Chris' patches for parity and ECC configuration via DT
- Merged the DDR RAM and L2 cache drivers (as requested by Borislav, analogous
  to fsl_ddr_edac.c and mpc85xx_edac.c)
- Added myself to MAINTAINERS (requested by Borislav)
- L2 cache: Track the msg size and use snprintf (review comment by Chris)
- L2 cache: Split error injection from the check function (review comment by
  Chris)
- DDR RAM: Allow 16 bit width in addition to 32 and 64 bit (review comment by
  Chris)
- Use of_match_ptr() (review comments by Chris)
- Minor checkpatch cleanups

Chris Packham (2):
  ARM: l2x0: support parity-enable/disable on aurora
  ARM: l2x0: add marvell,ecc-enable property for aurora

Jan Luebbe (7):
  ARM: l2c: move cache-aurora-l2.h to asm/hardware
  ARM: aurora-l2: add prefix to MAX_RANGE_SIZE
  ARM: aurora-l2: add defines for parity and ECC registers
  EDAC: Add missing debugfs_create_x32 wrapper
  EDAC: Add devres helpers for
    edac_mc_alloc/edac_mc_add_mc(_with_groups)
  EDAC: Add devres helpers for
    edac_device_alloc_ctl_info/edac_device_add_device
  EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC

 Documentation/devicetree/bindings/arm/l2c2x0.txt |   2 +
 MAINTAINERS                                      |   6 +
 arch/arm/include/asm/hardware/cache-aurora-l2.h  | 103 ++++
 arch/arm/mm/cache-aurora-l2.h                    |  55 --
 arch/arm/mm/cache-l2x0.c                         |  20 +-
 drivers/edac/Kconfig                             |   7 +
 drivers/edac/Makefile                            |   1 +
 drivers/edac/armada_xp_edac.c                    | 639 +++++++++++++++++++++++
 drivers/edac/debugfs.c                           |  11 +
 drivers/edac/edac_device.c                       |  60 +++
 drivers/edac/edac_device.h                       |  29 +
 drivers/edac/edac_mc.c                           |  54 ++
 drivers/edac/edac_mc.h                           |  26 +
 drivers/edac/edac_module.h                       |   5 +
 14 files changed, 960 insertions(+), 58 deletions(-)
 create mode 100644 arch/arm/include/asm/hardware/cache-aurora-l2.h
 delete mode 100644 arch/arm/mm/cache-aurora-l2.h
 create mode 100644 drivers/edac/armada_xp_edac.c

-- 
2.11.0

[PATCH v2 1/9] ARM: l2c: move cache-aurora-l2.h to asm/hardware

[Jan Luebbe]

This include file will be used by the AURORA EDAC code.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 arch/arm/{mm => include/asm/hardware}/cache-aurora-l2.h | 0
 arch/arm/mm/cache-l2x0.c                                | 2 +-
 2 files changed, 1 insertion(+), 1 deletion(-)
 rename arch/arm/{mm => include/asm/hardware}/cache-aurora-l2.h (100%)

diff --git a/arch/arm/mm/cache-aurora-l2.h b/arch/arm/include/asm/hardware/cache-aurora-l2.h
similarity index 100%
rename from arch/arm/mm/cache-aurora-l2.h
rename to arch/arm/include/asm/hardware/cache-aurora-l2.h
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 808efbb89b88..a00d6f7fd34c 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -30,8 +30,8 @@
 #include <asm/cp15.h>
 #include <asm/cputype.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <asm/hardware/cache-aurora-l2.h>
 #include "cache-tauros3.h"
-#include "cache-aurora-l2.h"
 
 struct l2c_init_data {
 	const char *type;
-- 
2.11.0

[PATCH v2 2/9] ARM: aurora-l2: add prefix to MAX_RANGE_SIZE

[Jan Luebbe]

The macro name is too generic, so add a AURORA_ prefix.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 arch/arm/include/asm/hardware/cache-aurora-l2.h | 2 +-
 arch/arm/mm/cache-l2x0.c                        | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/hardware/cache-aurora-l2.h b/arch/arm/include/asm/hardware/cache-aurora-l2.h
index c86124769831..dc5c479ec4c3 100644
--- a/arch/arm/include/asm/hardware/cache-aurora-l2.h
+++ b/arch/arm/include/asm/hardware/cache-aurora-l2.h
@@ -41,7 +41,7 @@
 #define AURORA_ACR_FORCE_WRITE_THRO_POLICY	\
 	(2 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
 
-#define MAX_RANGE_SIZE		1024
+#define AURORA_MAX_RANGE_SIZE	1024
 
 #define AURORA_WAY_SIZE_SHIFT	2
 
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index a00d6f7fd34c..7d2d2a3c67d0 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1364,8 +1364,8 @@ static unsigned long aurora_range_end(unsigned long start, unsigned long end)
 	 * since cache range operations stall the CPU pipeline
 	 * until completion.
 	 */
-	if (end > start + MAX_RANGE_SIZE)
-		end = start + MAX_RANGE_SIZE;
+	if (end > start + AURORA_MAX_RANGE_SIZE)
+		end = start + AURORA_MAX_RANGE_SIZE;
 
 	/*
 	 * Cache range operations can't straddle a page boundary.
-- 
2.11.0

[PATCH v2 3/9] ARM: aurora-l2: add defines for parity and ECC registers

[Jan Luebbe]

These defines will be used by subsequent patches to add support for the
parity check and error correction functionality in the Aurora L2 cache
controller.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 arch/arm/include/asm/hardware/cache-aurora-l2.h | 48 +++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/arch/arm/include/asm/hardware/cache-aurora-l2.h b/arch/arm/include/asm/hardware/cache-aurora-l2.h
index dc5c479ec4c3..c32be689d1f6 100644
--- a/arch/arm/include/asm/hardware/cache-aurora-l2.h
+++ b/arch/arm/include/asm/hardware/cache-aurora-l2.h
@@ -31,6 +31,9 @@
 #define AURORA_ACR_REPLACEMENT_TYPE_SEMIPLRU \
 	(3 << AURORA_ACR_REPLACEMENT_OFFSET)
 
+#define AURORA_ACR_PARITY_EN	(1 << 21)
+#define AURORA_ACR_ECC_EN	(1 << 20)
+
 #define AURORA_ACR_FORCE_WRITE_POLICY_OFFSET	0
 #define AURORA_ACR_FORCE_WRITE_POLICY_MASK	\
 	(0x3 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
@@ -41,6 +44,51 @@
 #define AURORA_ACR_FORCE_WRITE_THRO_POLICY	\
 	(2 << AURORA_ACR_FORCE_WRITE_POLICY_OFFSET)
 
+#define AURORA_ERR_CNT_REG          0x600
+#define AURORA_ERR_ATTR_CAP_REG     0x608
+#define AURORA_ERR_ADDR_CAP_REG     0x60c
+#define AURORA_ERR_WAY_CAP_REG      0x610
+#define AURORA_ERR_INJECT_CTL_REG   0x614
+#define AURORA_ERR_INJECT_MASK_REG  0x618
+
+#define AURORA_ERR_CNT_CLR_OFFSET         31
+#define AURORA_ERR_CNT_CLR		   \
+	(0x1 << AURORA_ERR_CNT_CLR_OFFSET)
+#define AURORA_ERR_CNT_UE_OFFSET          16
+#define AURORA_ERR_CNT_UE_MASK             \
+	(0x7fff << AURORA_ERR_CNT_UE_OFFSET)
+#define AURORA_ERR_CNT_CE_OFFSET            0
+#define AURORA_ERR_CNT_CE_MASK              \
+	(0xffff << AURORA_ERR_CNT_CE_OFFSET)
+
+#define AURORA_ERR_ATTR_CAP_ERR_SOURCE_OFFSET       16
+#define AURORA_ERR_ATTR_CAP_ERR_SOURCE_MASK          \
+	(0x7 << AURORA_ERR_ATTR_CAP_ERR_SOURCE_OFFSET)
+#define AURORA_ERR_ATTR_CAP_TRANS_TYPE_OFFSET       12
+#define AURORA_ERR_ATTR_CAP_TRANS_TYPE_MASK          \
+	(0xf << AURORA_ERR_ATTR_CAP_TRANS_TYPE_OFFSET)
+#define AURORA_ERR_ATTR_CAP_ERR_TYPE_OFFSET          8
+#define AURORA_ERR_ATTR_CAP_ERR_TYPE_MASK            \
+	(0x3 << AURORA_ERR_ATTR_CAP_ERR_TYPE_OFFSET)
+#define AURORA_ERR_ATTR_CAP_VALID_OFFSET             0
+#define AURORA_ERR_ATTR_CAP_VALID                    \
+	(0x1 << AURORA_ERR_ATTR_CAP_VALID_OFFSET)
+
+#define AURORA_ERR_ADDR_CAP_ADDR_MASK 0xffffffe0
+
+#define AURORA_ERR_WAY_CAP_INDEX_OFFSET          8
+#define AURORA_ERR_WAY_CAP_INDEX_MASK            \
+	(0xfff << AURORA_ERR_WAY_CAP_INDEX_OFFSET)
+#define AURORA_ERR_WAY_CAP_WAY_OFFSET          1
+#define AURORA_ERR_WAY_CAP_WAY_MASK            \
+	(0xf << AURORA_ERR_WAY_CAP_WAY_OFFSET)
+
+#define AURORA_ERR_INJECT_CTL_ADDR_MASK 0xfffffff0
+#define AURORA_ERR_ATTR_CAP_TRANS_TYPE_OFFSET   12
+#define AURORA_ERR_INJECT_CTL_EN_MASK          0x3
+#define AURORA_ERR_INJECT_CTL_EN_PARITY        0x2
+#define AURORA_ERR_INJECT_CTL_EN_ECC           0x1
+
 #define AURORA_MAX_RANGE_SIZE	1024
 
 #define AURORA_WAY_SIZE_SHIFT	2
-- 
2.11.0

[PATCH v2 4/9] ARM: l2x0: support parity-enable/disable on aurora

[Jan Luebbe]

From: Chris Packham <chris.packham@alliedtelesis.co.nz>

The aurora cache on the Marvell Armada-XP SoC supports the same tag
parity features as the other l2x0 cache implementations.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
[jlu at pengutronix.de: use aurora specific define AURORA_ACR_PARITY_EN]
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 arch/arm/mm/cache-l2x0.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 7d2d2a3c67d0..b70bee74750d 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1505,6 +1505,13 @@ static void __init aurora_of_parse(const struct device_node *np,
 		mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
 	}
 
+	if (of_property_read_bool(np, "arm,parity-enable")) {
+		mask |= AURORA_ACR_PARITY_EN;
+		val |= AURORA_ACR_PARITY_EN;
+	} else if (of_property_read_bool(np, "arm,parity-disable")) {
+		mask |= AURORA_ACR_PARITY_EN;
+	}
+
 	*aux_val &= ~mask;
 	*aux_val |= val;
 	*aux_mask &= ~mask;
-- 
2.11.0

[PATCH v2 5/9] ARM: l2x0: add marvell,ecc-enable property for aurora

[Jan Luebbe]

From: Chris Packham <chris.packham@alliedtelesis.co.nz>

The aurora cache on the Marvell Armada-XP SoC supports ECC protection
for the L2 data arrays. Add a "marvell,ecc-enable" device tree property
which can be used to enable this.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
[jlu at pengutronix.de: use aurora specific define AURORA_ACR_ECC_EN]
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 Documentation/devicetree/bindings/arm/l2c2x0.txt | 2 ++
 arch/arm/mm/cache-l2x0.c                         | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/l2c2x0.txt b/Documentation/devicetree/bindings/arm/l2c2x0.txt
index fbe6cb21f4cf..15a84f0ba9f1 100644
--- a/Documentation/devicetree/bindings/arm/l2c2x0.txt
+++ b/Documentation/devicetree/bindings/arm/l2c2x0.txt
@@ -76,6 +76,8 @@ Optional properties:
   specified to indicate that such transforms are precluded.
 - arm,parity-enable : enable parity checking on the L2 cache (L220 or PL310).
 - arm,parity-disable : disable parity checking on the L2 cache (L220 or PL310).
+- marvell,ecc-enable : enable ECC protection on the L2 cache
+- marvell,ecc-disable : disable ECC protection on the L2 cache
 - arm,outer-sync-disable : disable the outer sync operation on the L2 cache.
   Some core tiles, especially ARM PB11MPCore have a faulty L220 cache that
   will randomly hang unless outer sync operations are disabled.
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index b70bee74750d..644f786e4fa9 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1505,6 +1505,13 @@ static void __init aurora_of_parse(const struct device_node *np,
 		mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
 	}
 
+	if (of_property_read_bool(np, "marvell,ecc-enable")) {
+		mask |= AURORA_ACR_ECC_EN;
+		val |= AURORA_ACR_ECC_EN;
+	} else if (of_property_read_bool(np, "marvell,ecc-disable")) {
+		mask |= AURORA_ACR_ECC_EN;
+	}
+
 	if (of_property_read_bool(np, "arm,parity-enable")) {
 		mask |= AURORA_ACR_PARITY_EN;
 		val |= AURORA_ACR_PARITY_EN;
-- 
2.11.0

[PATCH v2 6/9] EDAC: Add missing debugfs_create_x32 wrapper

[Jan Luebbe]

We already have wrappers for x8 and x16, so add the missing x32 one.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 drivers/edac/debugfs.c     | 11 +++++++++++
 drivers/edac/edac_module.h |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c
index 92dbb7e2320c..268ede7a60b2 100644
--- a/drivers/edac/debugfs.c
+++ b/drivers/edac/debugfs.c
@@ -161,3 +161,14 @@ struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode,
 	return debugfs_create_x16(name, mode, parent, value);
 }
 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);
+
+/* Wrapper for debugfs_create_x32() */
+struct dentry *edac_debugfs_create_x32(const char *name, umode_t mode,
+				       struct dentry *parent, u32 *value)
+{
+	if (!parent)
+		parent = edac_debugfs;
+
+	return debugfs_create_x32(name, mode, parent, value);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_x32);
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index 014871e169cc..3d87cb15ab45 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -81,6 +81,8 @@ struct dentry *
 edac_debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent, u8 *value);
 struct dentry *
 edac_debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent, u16 *value);
+struct dentry *
+edac_debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent, u32 *value);
 #else
 static inline int edac_debugfs_init(void)					{ return -ENODEV; }
 static inline void edac_debugfs_exit(void)					{ }
@@ -97,6 +99,9 @@ edac_debugfs_create_x8(const char *name, umode_t mode,
 static inline struct dentry *
 edac_debugfs_create_x16(const char *name, umode_t mode,
 		       struct dentry *parent, u16 *value)			{ return NULL; }
+static inline struct dentry *
+edac_debugfs_create_x32(const char *name, umode_t mode,
+		       struct dentry *parent, u32 *value)			{ return NULL; }
 #endif
 
 /*
-- 
2.11.0

[PATCH v2 7/9] EDAC: Add devres helpers for edac_mc_alloc/edac_mc_add_mc(_with_groups)

[Jan Luebbe]

These helpers simplify error handling in the _probe functions and automate
deallocation in the _remove functions.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 drivers/edac/edac_mc.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 drivers/edac/edac_mc.h | 26 ++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 480072139b7a..d3ee2b851329 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -517,6 +517,34 @@ void edac_mc_free(struct mem_ctl_info *mci)
 }
 EXPORT_SYMBOL_GPL(edac_mc_free);
 
+/**
+ * devm_edac_mc_free() - Internal helper to call edac_mc_free from a devres
+ *	action.
+ */
+static void devm_edac_mc_free(void *mci)
+{
+	edac_mc_free((struct mem_ctl_info *)mci);
+}
+
+struct mem_ctl_info *devm_edac_mc_alloc(struct device *dev,
+					unsigned int mc_num,
+					unsigned int n_layers,
+					struct edac_mc_layer *layers,
+					unsigned int sz_pvt)
+{
+	struct mem_ctl_info *mci;
+
+	mci = edac_mc_alloc(mc_num, n_layers, layers, sz_pvt);
+	if (!mci)
+		return mci;
+
+	if (devm_add_action_or_reset(dev, devm_edac_mc_free, mci))
+		return NULL;
+
+	return mci;
+}
+EXPORT_SYMBOL_GPL(devm_edac_mc_alloc);
+
 bool edac_has_mcs(void)
 {
 	bool ret;
@@ -828,6 +856,32 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(edac_mc_del_mc);
 
+/**
+ * devm_edac_mc_del_mc() - Internal helper to call edac_mc_del_mc from a devres
+ *	action.
+ */
+static void devm_edac_mc_del_mc(void *dev)
+{
+	edac_mc_del_mc((struct device *)dev);
+}
+
+int devm_edac_mc_add_mc_with_groups(struct device *dev,
+				    struct mem_ctl_info *mci,
+				    const struct attribute_group **groups)
+{
+	int ret;
+
+	ret = edac_mc_add_mc_with_groups(mci, groups);
+	if (ret)
+		return ret;
+
+	if (devm_add_action_or_reset(dev, devm_edac_mc_del_mc, dev))
+		return 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_edac_mc_add_mc_with_groups);
+
 static void edac_mc_scrub_block(unsigned long page, unsigned long offset,
 				u32 size)
 {
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index 5357800e418d..32f88cc4a65b 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -149,6 +149,32 @@ extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
 extern void edac_mc_free(struct mem_ctl_info *mci);
 
 /**
+ * devm_edac_mc_alloc() - Helper to call edac_mc_alloc() and register it for
+ *	cleanup with devres.
+ *
+ * Returns:
+ *	On success, return a pointer to struct mem_ctl_info pointer;
+ *	%NULL otherwise
+ */
+struct mem_ctl_info *devm_edac_mc_alloc(struct device *dev,
+					unsigned int mc_num,
+					unsigned int n_layers,
+					struct edac_mc_layer *layers,
+					unsigned int sz_pvt);
+
+/**
+ * devm_edac_mc_add_mc_with_groups() - Helper to call
+ *	edac_mc_add_mc_with_groups() and register it for cleanup with devres.
+ *
+ * Returns:
+ *	0 on Success, or an error code on failure
+ */
+int devm_edac_mc_add_mc_with_groups(struct device *dev,
+				    struct mem_ctl_info *mci,
+				    const struct attribute_group **groups);
+#define devm_edac_mc_add_mc(dev, mci)	devm_edac_mc_add_mc_with_groups(dev, mci, NULL)
+
+/**
  * edac_has_mcs() - Check if any MCs have been allocated.
  *
  * Returns:
-- 
2.11.0

[PATCH v2 8/9] EDAC: Add devres helpers for edac_device_alloc_ctl_info/edac_device_add_device

[Jan Luebbe]

These helpers simplify error handling in the _probe functions and
automate deallocation in the _remove functions.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 drivers/edac/edac_device.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++
 drivers/edac/edac_device.h | 29 ++++++++++++++++++++++
 2 files changed, 89 insertions(+)

diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c
index 65cf2b9355c4..d011f42c3507 100644
--- a/drivers/edac/edac_device.c
+++ b/drivers/edac/edac_device.c
@@ -232,6 +232,42 @@ void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info)
 }
 EXPORT_SYMBOL_GPL(edac_device_free_ctl_info);
 
+/**
+ * devm_edac_device_free_ctl_info() - Internal helper to call
+ *	edac_device_free_ctl_info from a devres action
+ */
+static void devm_edac_device_free_ctl_info(void *ctl_info)
+{
+	edac_device_free_ctl_info((struct edac_device_ctl_info *)ctl_info);
+}
+
+struct edac_device_ctl_info *devm_edac_device_alloc_ctl_info(
+	struct device *dev,
+	unsigned int sz_private,
+	char *edac_device_name, unsigned int nr_instances,
+	char *edac_block_name, unsigned int nr_blocks,
+	unsigned int offset_value,
+	struct edac_dev_sysfs_block_attribute *attrib_spec, unsigned int nr_attrib,
+	int device_index)
+{
+	struct edac_device_ctl_info *ctl_info;
+
+	ctl_info = edac_device_alloc_ctl_info(sz_private,
+			edac_device_name, nr_instances,
+			edac_block_name, nr_blocks,
+			offset_value,
+			attrib_spec, nr_attrib,
+			device_index);
+	if (!ctl_info)
+		return ctl_info;
+
+	if (devm_add_action_or_reset(dev, devm_edac_device_free_ctl_info, ctl_info))
+		return NULL;
+
+	return ctl_info;
+}
+EXPORT_SYMBOL_GPL(devm_edac_device_alloc_ctl_info);
+
 /*
  * find_edac_device_by_dev
  *	scans the edac_device list for a specific 'struct device *'
@@ -539,6 +575,30 @@ struct edac_device_ctl_info *edac_device_del_device(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(edac_device_del_device);
 
+/**
+ * devm_edac_device_del_device() - Internal helper to call
+ *	edac_device_del_device from a devres action
+ */
+static void devm_edac_device_del_device(void *dev)
+{
+	edac_device_del_device((struct device *)dev);
+}
+
+int devm_edac_device_add_device(struct device *dev,
+		struct edac_device_ctl_info *edac_dev)
+{
+	int ret;
+
+	ret = edac_device_add_device(edac_dev);
+	if (ret)
+		return ret;
+
+	if (devm_add_action_or_reset(dev, devm_edac_device_del_device, dev))
+		return 1;
+
+	return 0;
+}
+
 static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev)
 {
 	return edac_dev->log_ce;
diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
index 1aaba74ae411..711a50b133cd 100644
--- a/drivers/edac/edac_device.h
+++ b/drivers/edac/edac_device.h
@@ -258,6 +258,24 @@ extern struct edac_device_ctl_info *edac_device_alloc_ctl_info(
 extern void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info);
 
 /**
+ * devm_edac_device_alloc_ctl_info: Allocate a new managed edac device
+ *	control info structure
+ *
+ *	This function takes the same arguments as edac_device_alloc_ctl_info in
+ *	addition to the owning device. The structure is freed by devres using
+ *	edac_device_free_ctl_info.
+ */
+extern struct edac_device_ctl_info *devm_edac_device_alloc_ctl_info(
+		struct device *dev,
+		unsigned int sizeof_private,
+		char *edac_device_name, unsigned int nr_instances,
+		char *edac_block_name, unsigned int nr_blocks,
+		unsigned int offset_value,
+		struct edac_dev_sysfs_block_attribute *block_attributes,
+		unsigned int nr_attribs,
+		int device_index);
+
+/**
  * edac_device_add_device: Insert the 'edac_dev' structure into the
  *	 edac_device global list and create sysfs entries associated with
  *	 edac_device structure.
@@ -286,6 +304,17 @@ extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev);
 extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
 
 /**
+ * devm_edac_device_add_device:
+ *	Helper to call edac_device_add_device and register it for cleanup with
+ *	devres.
+ *
+ * Returns:
+ *	0 on Success, or an error code on failure
+ */
+extern int devm_edac_device_add_device(struct device *dev,
+				       struct edac_device_ctl_info *edac_dev);
+
+/**
  * edac_device_handle_ue():
  *	perform a common output and handling of an 'edac_dev' UE event
  *
-- 
2.11.0

[PATCH v2 9/9] EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC

[Jan Luebbe]

Add support for the ECC functionality as found in the DDR RAM and L2
cache controllers on the MV78230/MV78x60 SoCs. This driver has been
tested on the MV78460 (on a custom board with a DDR3 ECC DIMM).

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 MAINTAINERS                   |   6 +
 drivers/edac/Kconfig          |   7 +
 drivers/edac/Makefile         |   1 +
 drivers/edac/armada_xp_edac.c | 639 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 653 insertions(+)
 create mode 100644 drivers/edac/armada_xp_edac.c

diff --git a/MAINTAINERS b/MAINTAINERS
index f66488dfdbc9..f40d6b5cfd18 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4814,6 +4814,12 @@ L:	linux-edac at vger.kernel.org
 S:	Maintained
 F:	drivers/edac/amd64_edac*
 
+EDAC-ARMADA
+M:	Jan Luebbe <jlu@pengutronix.de>
+L:	linux-edac at vger.kernel.org
+S:	Maintained
+F:	drivers/edac/armada_xp_*
+
 EDAC-CALXEDA
 M:	Robert Richter <rric@kernel.org>
 L:	linux-edac at vger.kernel.org
diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 96afb2aeed18..4e123ec94a4a 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -443,6 +443,13 @@ config EDAC_ALTERA_SDMMC
 	  Support for error detection and correction on the
 	  Altera SDMMC FIFO Memory for Altera SoCs.
 
+config EDAC_ARMADA_XP
+	bool "Marvell Armada XP DDR and L2 Cache ECC"
+	depends on ARCH_MVEBU
+	help
+	  Support for error correction and detection on the Marvell Aramada XP
+	  DDR RAM and L2 cache controllers.
+
 config EDAC_SYNOPSYS
 	tristate "Synopsys DDR Memory Controller"
 	depends on ARCH_ZYNQ
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 0fd9ffa63299..70a093cc976e 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -76,5 +76,6 @@ obj-$(CONFIG_EDAC_OCTEON_PCI)		+= octeon_edac-pci.o
 obj-$(CONFIG_EDAC_THUNDERX)		+= thunderx_edac.o
 
 obj-$(CONFIG_EDAC_ALTERA)		+= altera_edac.o
+obj-$(CONFIG_EDAC_ARMADA_XP)		+= armada_xp_edac.o
 obj-$(CONFIG_EDAC_SYNOPSYS)		+= synopsys_edac.o
 obj-$(CONFIG_EDAC_XGENE)		+= xgene_edac.o
diff --git a/drivers/edac/armada_xp_edac.c b/drivers/edac/armada_xp_edac.c
new file mode 100644
index 000000000000..68e88b180928
--- /dev/null
+++ b/drivers/edac/armada_xp_edac.c
@@ -0,0 +1,639 @@
+/*
+ * Copyright (C) 2017 Pengutronix, Jan Luebbe <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/edac.h>
+#include <linux/of_platform.h>
+
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/hardware/cache-aurora-l2.h>
+
+#include "edac_mc.h"
+#include "edac_device.h"
+#include "edac_module.h"
+
+/************************ EDAC MC (DDR RAM) ********************************/
+
+#define SDRAM_NUM_CS 4
+
+#define SDRAM_CONFIG_REG 0x0
+#define SDRAM_CONFIG_ECC_MASK        BIT(18)
+#define SDRAM_CONFIG_REGISTERED_MASK BIT(17)
+#define SDRAM_CONFIG_BUS_WIDTH_MASK  BIT(15)
+
+#define SDRAM_ADDR_CTRL_REG 0x10
+#define SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(cs)   (20+cs)
+#define SDRAM_ADDR_CTRL_SIZE_HIGH_MASK(cs)           \
+	(0x1 << SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(cs))
+#define SDRAM_ADDR_CTRL_ADDR_SEL_MASK(cs)   BIT(16+cs)
+#define SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(cs)   (cs*4+2)
+#define SDRAM_ADDR_CTRL_SIZE_LOW_MASK(cs)            \
+	(0x3 << SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(cs))
+#define SDRAM_ADDR_CTRL_STRUCT_OFFSET(cs)       (cs*4)
+#define SDRAM_ADDR_CTRL_STRUCT_MASK(cs)              \
+	(0x3 << SDRAM_ADDR_CTRL_STRUCT_OFFSET(cs))
+
+#define SDRAM_ERR_DATA_H_REG 0x40
+#define SDRAM_ERR_DATA_L_REG 0x44
+
+#define SDRAM_ERR_RECV_ECC_REG 0x48
+#define SDRAM_ERR_RECV_ECC_VALUE_MASK 0xff
+
+#define SDRAM_ERR_CALC_ECC_REG 0x4c
+#define SDRAM_ERR_CALC_ECC_ROW_OFFSET             8
+#define SDRAM_ERR_CALC_ECC_ROW_MASK               \
+	(0xffff << SDRAM_ERR_CALC_ECC_ROW_OFFSET)
+#define SDRAM_ERR_CALC_ECC_VALUE_MASK          0xff
+
+#define SDRAM_ERR_ADDR_REG 0x50
+#define SDRAM_ERR_ADDR_BANK_OFFSET           23
+#define SDRAM_ERR_ADDR_BANK_MASK              \
+	(0x7 << SDRAM_ERR_ADDR_BANK_OFFSET)
+#define SDRAM_ERR_ADDR_COL_OFFSET             8
+#define SDRAM_ERR_ADDR_COL_MASK               \
+	(0x7fff << SDRAM_ERR_ADDR_COL_OFFSET)
+#define SDRAM_ERR_ADDR_CS_OFFSET              1
+#define SDRAM_ERR_ADDR_CS_MASK                \
+	(0x3 << SDRAM_ERR_ADDR_CS_OFFSET)
+#define SDRAM_ERR_ADDR_TYPE_MASK         BIT(0)
+
+#define SDRAM_ERR_CTRL_REG 0x54
+#define SDRAM_ERR_CTRL_ERR_THR_OFFSET          16
+#define SDRAM_ERR_CTRL_ERR_THR_MASK             \
+	(0xff << SDRAM_ERR_CTRL_ERR_THR_OFFSET)
+#define SDRAM_ERR_CTRL_ERR_PROP_MASK       BIT(9)
+
+#define SDRAM_ERR_SBE_COUNT_REG 0x58
+#define SDRAM_ERR_DBE_COUNT_REG 0x5c
+
+#define SDRAM_ERR_CAUSE_ERR_REG 0xd0
+#define SDRAM_ERR_CAUSE_MSG_REG 0xd8
+#define SDRAM_ERR_CAUSE_DBE_MASK BIT(1)
+#define SDRAM_ERR_CAUSE_SBE_MASK BIT(0)
+
+#define SDRAM_RANK_CTRL_REG 0x1e0
+#define SDRAM_RANK_CTRL_EXIST_MASK(cs) BIT(cs)
+
+struct armada_xp_mc_edac_drvdata {
+	void __iomem *base;
+
+	unsigned int width; /* width in bytes */
+	bool cs_addr_sel[SDRAM_NUM_CS]; /* bank interleaving */
+
+	char msg[128];
+};
+
+/* derived from "DRAM Address Multiplexing" in the ARAMDA XP Functional Spec */
+static uint32_t armada_xp_mc_edac_calc_address(struct armada_xp_mc_edac_drvdata
+					       *drvdata, uint8_t cs,
+					       uint8_t bank, uint16_t row,
+					       uint16_t col)
+{
+	if (drvdata->width == 4) { /* 64 bit */
+		if (drvdata->cs_addr_sel[cs]) /* bank interleaved */
+			return (((row & 0xfff8) << 16) |
+				((bank & 0x7) << 16) |
+				((row & 0x7) << 13) |
+				((col & 0x3ff) << 3));
+		else
+			return (((row & 0xffff << 16) |
+				 ((bank & 0x7) << 13) |
+				 ((col & 0x3ff)) << 3));
+	} else if (drvdata->width == 2) { /* 32 bit */
+		if (drvdata->cs_addr_sel[cs]) /* bank interleaved */
+			return (((row & 0xfff0) << 15) |
+				((bank & 0x7) << 16) |
+				((row & 0xf) << 12) |
+				((col & 0x3ff) << 2));
+		else
+			return (((row & 0xffff << 15) |
+				 ((bank & 0x7) << 12) |
+				 ((col & 0x3ff)) << 2));
+	} else { /* 16 bit */
+		if (drvdata->cs_addr_sel[cs]) /* bank interleaved */
+			return (((row & 0xffe0) << 14) |
+				((bank & 0x7) << 16) |
+				((row & 0x1f) << 11) |
+				((col & 0x3ff) << 1));
+		else
+			return (((row & 0xffff << 14) |
+				 ((bank & 0x7) << 11) |
+				 ((col & 0x3ff)) << 1));
+	}
+}
+
+static void armada_xp_mc_edac_check(struct mem_ctl_info *mci)
+{
+	struct armada_xp_mc_edac_drvdata *drvdata = mci->pvt_info;
+	uint32_t data_h, data_l, recv_ecc, calc_ecc, addr;
+	uint32_t cnt_sbe, cnt_dbe, cause_err, cause_msg;
+	uint32_t row_val, col_val, bank_val, addr_val;
+	uint8_t syndrome_val, cs_val;
+	char *msg = drvdata->msg;
+
+	data_h = readl(drvdata->base + SDRAM_ERR_DATA_H_REG);
+	data_l = readl(drvdata->base + SDRAM_ERR_DATA_L_REG);
+	recv_ecc = readl(drvdata->base + SDRAM_ERR_RECV_ECC_REG);
+	calc_ecc = readl(drvdata->base + SDRAM_ERR_CALC_ECC_REG);
+	addr = readl(drvdata->base + SDRAM_ERR_ADDR_REG);
+	cnt_sbe = readl(drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
+	cnt_dbe = readl(drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
+	cause_err = readl(drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
+	cause_msg = readl(drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
+
+	/* clear cause registers */
+	writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
+	       drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
+	writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
+	       drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
+
+	/* clear error counter registers */
+	if (cnt_sbe)
+		writel(0, drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
+	if (cnt_dbe)
+		writel(0, drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
+
+	if (!cnt_sbe && !cnt_dbe)
+		return;
+
+	if ((addr & SDRAM_ERR_ADDR_TYPE_MASK) == 0) {
+		if (cnt_sbe)
+			cnt_sbe--;
+		else
+			dev_warn(mci->pdev, "inconsistent SBE count detected");
+	} else {
+		if (cnt_dbe)
+			cnt_dbe--;
+		else
+			dev_warn(mci->pdev, "inconsistent DBE count detected");
+	}
+
+	/* report earlier errors */
+	if (cnt_sbe)
+		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+				     cnt_sbe, /* error count */
+				     0, 0, 0, /* pfn, offset, syndrome */
+				     -1, -1, -1, /* top, mid, low layer */
+				     mci->ctl_name,
+				     "details unavailable (multiple errors)");
+	if (cnt_dbe)
+		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+				     cnt_sbe, /* error count */
+				     0, 0, 0, /* pfn, offset, syndrome */
+				     -1, -1, -1, /* top, mid, low layer */
+				     mci->ctl_name,
+				     "details unavailable (multiple errors)");
+
+	/* report details for most recent error */
+	cs_val = (addr & SDRAM_ERR_ADDR_CS_MASK)
+	    >> SDRAM_ERR_ADDR_CS_OFFSET;
+	bank_val = (addr & SDRAM_ERR_ADDR_BANK_MASK)
+	    >> SDRAM_ERR_ADDR_BANK_OFFSET;
+	row_val = (calc_ecc & SDRAM_ERR_CALC_ECC_ROW_MASK)
+	    >> SDRAM_ERR_CALC_ECC_ROW_OFFSET;
+	col_val = (addr & SDRAM_ERR_ADDR_COL_MASK)
+	    >> SDRAM_ERR_ADDR_COL_OFFSET;
+	syndrome_val = (recv_ecc ^ calc_ecc) & 0xff;
+	addr_val = armada_xp_mc_edac_calc_address(drvdata, cs_val, bank_val,
+						  row_val, col_val);
+	msg += sprintf(msg, "row=0x%04x ", row_val); /* 11 chars */
+	msg += sprintf(msg, "bank=0x%x ", bank_val); /*  9 chars */
+	msg += sprintf(msg, "col=0x%04x ", col_val); /* 11 chars */
+	msg += sprintf(msg, "cs=%d", cs_val);	     /*  4 chars */
+
+	if ((addr & SDRAM_ERR_ADDR_TYPE_MASK) == 0) {
+		edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
+				     1,	/* error count */
+				     addr_val >> PAGE_SHIFT,
+				     addr_val & ~PAGE_MASK,
+				     syndrome_val,
+				     cs_val, -1, -1, /* top, mid, low layer */
+				     mci->ctl_name, drvdata->msg);
+	} else {
+		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
+				     1,	/* error count */
+				     addr_val >> PAGE_SHIFT,
+				     addr_val & ~PAGE_MASK,
+				     syndrome_val,
+				     cs_val, -1, -1, /* top, mid, low layer */
+				     mci->ctl_name, drvdata->msg);
+	}
+}
+
+static int armada_xp_mc_edac_read_config(struct mem_ctl_info *mci)
+{
+	struct armada_xp_mc_edac_drvdata *drvdata = mci->pvt_info;
+	struct dimm_info *dimm;
+	unsigned int i, cs_struct, cs_size;
+	uint32_t config, addr_ctrl, rank_ctrl;
+
+	config = readl(drvdata->base + SDRAM_CONFIG_REG);
+	if (!(config & SDRAM_CONFIG_ECC_MASK))
+		dev_warn(mci->pdev, "SDRAM ECC is not enabled");
+
+	if (mci->tot_dimms != SDRAM_NUM_CS) {
+		dev_err(mci->pdev, "Invaild number of DIMMs");
+		return -EINVAL;
+	}
+
+	if (config & SDRAM_CONFIG_BUS_WIDTH_MASK)
+		drvdata->width = 4; /* 64 bit */
+	else
+		drvdata->width = 2; /* 32 bit */
+
+	addr_ctrl = readl(drvdata->base + SDRAM_ADDR_CTRL_REG);
+	rank_ctrl = readl(drvdata->base + SDRAM_RANK_CTRL_REG);
+	for (i = 0; i < SDRAM_NUM_CS; i++) {
+		dimm = mci->dimms[i];
+
+		if (!(rank_ctrl & SDRAM_RANK_CTRL_EXIST_MASK(i)))
+			continue;
+
+		drvdata->cs_addr_sel[i] =
+			!!(addr_ctrl & SDRAM_ADDR_CTRL_ADDR_SEL_MASK(i));
+
+		cs_struct = (addr_ctrl & SDRAM_ADDR_CTRL_STRUCT_MASK(i)) >>
+			SDRAM_ADDR_CTRL_STRUCT_OFFSET(i);
+		cs_size = ((addr_ctrl & SDRAM_ADDR_CTRL_SIZE_HIGH_MASK(i)) >>
+			   (SDRAM_ADDR_CTRL_SIZE_HIGH_OFFSET(i) - 2) |
+			   ((addr_ctrl & SDRAM_ADDR_CTRL_SIZE_LOW_MASK(i)) >>
+			    SDRAM_ADDR_CTRL_SIZE_LOW_OFFSET(i)));
+		switch (cs_size) {
+		case 0: /* 2GBit */
+			dimm->nr_pages = (0x80000000ULL >> PAGE_SHIFT);
+			break;
+		case 1: /* 256MBit */
+			dimm->nr_pages = (0x10000000ULL >> PAGE_SHIFT);
+			break;
+		case 2: /* 512MBit */
+			dimm->nr_pages = (0x20000000ULL >> PAGE_SHIFT);
+			break;
+		case 3: /* 1GBit */
+			dimm->nr_pages = (0x40000000ULL >> PAGE_SHIFT);
+			break;
+		case 4: /* 4GBit */
+			dimm->nr_pages = (0x100000000ULL >> PAGE_SHIFT);
+			break;
+		case 5: /* 8GBit */
+			dimm->nr_pages = (0x200000000ULL >> PAGE_SHIFT);
+			break;
+		}
+		dimm->grain = 8;
+		dimm->dtype = cs_struct ? DEV_X16 : DEV_X8;
+		dimm->mtype = (config & SDRAM_CONFIG_REGISTERED_MASK) ?
+			MEM_RDDR3 : MEM_DDR3;
+		dimm->edac_mode = EDAC_SECDED;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id armada_xp_mc_edac_of_match[] = {
+	{.compatible = "marvell,armada-xp-sdram-controller",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, armada_xp_mc_edac_of_match);
+
+static int armada_xp_mc_edac_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *id;
+	struct mem_ctl_info *mci;
+	struct edac_mc_layer layers[1];
+	struct armada_xp_mc_edac_drvdata *drvdata;
+	struct resource *r;
+
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = SDRAM_NUM_CS;
+	layers[0].is_virt_csrow = true;
+
+	mci = devm_edac_mc_alloc(&pdev->dev, 0, ARRAY_SIZE(layers), layers,
+				 sizeof(*drvdata));
+	if (!mci)
+		return -ENOMEM;
+
+	drvdata = mci->pvt_info;
+	mci->pdev = &pdev->dev;
+	platform_set_drvdata(pdev, mci);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "Unable to get mem resource\n");
+		return -ENODEV;
+	}
+
+	drvdata->base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(drvdata->base)) {
+		dev_err(&pdev->dev, "Unable to map regs\n");
+		return PTR_ERR(drvdata->base);
+	}
+
+	id = of_match_device(armada_xp_mc_edac_of_match, &pdev->dev);
+	mci->edac_check = armada_xp_mc_edac_check;
+	mci->mtype_cap = MEM_FLAG_DDR3;
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->mod_name = pdev->dev.driver->name;
+	mci->ctl_name = id ? id->compatible : "unknown";
+	mci->dev_name = dev_name(&pdev->dev);
+	mci->scrub_mode = SCRUB_NONE;
+
+	if (armada_xp_mc_edac_read_config(mci))
+		return -EINVAL;
+
+	/* configure SBE threshold */
+	/* it seems that SBEs are not captured otherwise */
+	writel(1 << SDRAM_ERR_CTRL_ERR_THR_OFFSET,
+	       drvdata->base + SDRAM_ERR_CTRL_REG);
+
+	/* clear cause registers */
+	writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
+	       drvdata->base + SDRAM_ERR_CAUSE_ERR_REG);
+	writel(~(SDRAM_ERR_CAUSE_DBE_MASK | SDRAM_ERR_CAUSE_SBE_MASK),
+	       drvdata->base + SDRAM_ERR_CAUSE_MSG_REG);
+
+	/* clear counter registers */
+	writel(0, drvdata->base + SDRAM_ERR_SBE_COUNT_REG);
+	writel(0, drvdata->base + SDRAM_ERR_DBE_COUNT_REG);
+
+	if (devm_edac_mc_add_mc(&pdev->dev, mci))
+		return -EINVAL;
+	edac_op_state = EDAC_OPSTATE_POLL;
+
+	return 0;
+}
+
+static struct platform_driver armada_xp_mc_edac_driver = {
+	.probe = armada_xp_mc_edac_probe,
+	.driver = {
+		.name = "armada_xp_mc_edac",
+		.of_match_table = of_match_ptr(armada_xp_mc_edac_of_match),
+	},
+};
+
+/************************ EDAC Device (L2 Cache) ***************************/
+
+struct aurora_l2_edac_drvdata {
+	void __iomem *base;
+
+	char msg[128];
+
+	/* error injection via debugfs */
+	uint32_t inject_addr;
+	uint32_t inject_mask;
+	uint8_t inject_ctl;
+
+	struct dentry *debugfs;
+};
+
+static void aurora_l2_edac_inject(struct aurora_l2_edac_drvdata *drvdata)
+{
+	drvdata->inject_addr &= AURORA_ERR_INJECT_CTL_ADDR_MASK;
+	drvdata->inject_ctl &= AURORA_ERR_INJECT_CTL_EN_MASK;
+	writel(0, drvdata->base + AURORA_ERR_INJECT_CTL_REG);
+	writel(drvdata->inject_mask,
+	       drvdata->base + AURORA_ERR_INJECT_MASK_REG);
+	writel(drvdata->inject_addr | drvdata->inject_ctl,
+	       drvdata->base + AURORA_ERR_INJECT_CTL_REG);
+}
+
+static void aurora_l2_edac_check(struct edac_device_ctl_info *dci)
+{
+	struct aurora_l2_edac_drvdata *drvdata = dci->pvt_info;
+	uint32_t cnt, attr_cap, addr_cap, way_cap;
+	unsigned int cnt_ce, cnt_ue;
+
+	cnt = readl(drvdata->base + AURORA_ERR_CNT_REG);
+	attr_cap = readl(drvdata->base + AURORA_ERR_ATTR_CAP_REG);
+	addr_cap = readl(drvdata->base + AURORA_ERR_ADDR_CAP_REG);
+	way_cap = readl(drvdata->base + AURORA_ERR_WAY_CAP_REG);
+
+	cnt_ce = (cnt & AURORA_ERR_CNT_CE_MASK) >> AURORA_ERR_CNT_CE_OFFSET;
+	cnt_ue = (cnt & AURORA_ERR_CNT_UE_MASK) >> AURORA_ERR_CNT_UE_OFFSET;
+	/* clear error counter registers */
+	if (cnt_ce || cnt_ue)
+		writel(AURORA_ERR_CNT_CLR, drvdata->base + AURORA_ERR_CNT_REG);
+
+	if (attr_cap & AURORA_ERR_ATTR_CAP_VALID) {
+		char *msg = drvdata->msg;
+		size_t size = sizeof(drvdata->msg);
+		size_t len = 0;
+
+		switch ((attr_cap & AURORA_ERR_ATTR_CAP_ERR_SOURCE_MASK)
+			>> AURORA_ERR_ATTR_CAP_ERR_SOURCE_OFFSET) {
+		case 0:
+			len += snprintf(msg+len, size-len, "src=CPU0 ");
+			break;
+		case 1:
+			len += snprintf(msg+len, size-len, "src=CPU1 ");
+			break;
+		case 2:
+			len += snprintf(msg+len, size-len, "src=CPU2 ");
+			break;
+		case 3:
+			len += snprintf(msg+len, size-len, "src=CPU3 ");
+			break;
+		case 7:
+			len += snprintf(msg+len, size-len, "src=IO ");
+			break;
+		}
+		switch ((attr_cap & AURORA_ERR_ATTR_CAP_TRANS_TYPE_MASK)
+			>> AURORA_ERR_ATTR_CAP_TRANS_TYPE_OFFSET) {
+		case 0:
+			len += snprintf(msg+len, size-len, "txn=Data-Read ");
+			break;
+		case 1:
+			len += snprintf(msg+len, size-len, "txn=Isn-Read ");
+			break;
+		case 2:
+			len += snprintf(msg+len, size-len, "txn=Clean-Flush ");
+			break;
+		case 3:
+			len += snprintf(msg+len, size-len, "txn=Eviction ");
+			break;
+		case 4:
+			len += snprintf(msg+len, size-len,
+					"txn=Read-Modify-Write ");
+			break;
+		}
+		switch ((attr_cap & AURORA_ERR_ATTR_CAP_ERR_TYPE_MASK)
+			>> AURORA_ERR_ATTR_CAP_ERR_TYPE_OFFSET) {
+		case 0:
+			len += snprintf(msg+len, size-len, "err=CorrECC ");
+			break;
+		case 1:
+			len += snprintf(msg+len, size-len, "err=UnCorrECC ");
+			break;
+		case 2:
+			len += snprintf(msg+len, size-len, "err=TagParity ");
+			break;
+		}
+		len += snprintf(msg+len, size-len, "addr=0x%x ",
+			    addr_cap & AURORA_ERR_ADDR_CAP_ADDR_MASK);
+		len += snprintf(msg+len, size-len, "index=0x%x ",
+			    (way_cap & AURORA_ERR_WAY_CAP_INDEX_MASK)
+			    >> AURORA_ERR_WAY_CAP_INDEX_OFFSET);
+		len += snprintf(msg+len, size-len, "way=0x%x",
+			    (way_cap & AURORA_ERR_WAY_CAP_WAY_MASK)
+			    >> AURORA_ERR_WAY_CAP_WAY_OFFSET);
+		/* clear error capture registers */
+		writel(AURORA_ERR_ATTR_CAP_VALID,
+		       drvdata->base + AURORA_ERR_ATTR_CAP_REG);
+		if ((attr_cap & AURORA_ERR_ATTR_CAP_ERR_TYPE_MASK)
+		    >> AURORA_ERR_ATTR_CAP_ERR_TYPE_OFFSET) {
+			/* UnCorrECC or TagParity */
+			if (cnt_ue)
+				cnt_ue--;
+			edac_device_handle_ue(dci, 0, 0, drvdata->msg);
+		} else {
+			if (cnt_ce)
+				cnt_ce--;
+			edac_device_handle_ce(dci, 0, 0, drvdata->msg);
+		}
+	}
+
+	/* report remaining errors */
+	while (cnt_ue--)
+		edac_device_handle_ue(dci, 0, 0,
+				      "details unavailable (multiple errors)");
+	while (cnt_ce--)
+		edac_device_handle_ue(dci, 0, 0,
+				      "details unavailable (multiple errors)");
+}
+
+static void aurora_l2_edac_poll(struct edac_device_ctl_info *dci)
+{
+	struct aurora_l2_edac_drvdata *drvdata = dci->pvt_info;
+
+	aurora_l2_edac_check(dci);
+	aurora_l2_edac_inject(drvdata);
+}
+
+static const struct of_device_id aurora_l2_edac_of_match[] = {
+	{.compatible = "marvell,aurora-system-cache",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, aurora_l2_edac_of_match);
+
+static int aurora_l2_edac_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *id;
+	struct edac_device_ctl_info *dci;
+	struct aurora_l2_edac_drvdata *drvdata;
+	struct resource *r;
+	uint32_t l2x0_aux_ctrl;
+
+	dci = devm_edac_device_alloc_ctl_info(&pdev->dev, sizeof(*drvdata),
+					      "cpu", 1, "L", 1, 2, NULL, 0, 0);
+	if (!dci)
+		return -ENOMEM;
+
+	drvdata = dci->pvt_info;
+	dci->dev = &pdev->dev;
+	platform_set_drvdata(pdev, dci);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		dev_err(&pdev->dev, "Unable to get mem resource\n");
+		return -ENODEV;
+	}
+
+	drvdata->base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(drvdata->base)) {
+		dev_err(&pdev->dev, "Unable to map regs\n");
+		return PTR_ERR(drvdata->base);
+	}
+
+	l2x0_aux_ctrl = readl(drvdata->base + L2X0_AUX_CTRL);
+	if (!(l2x0_aux_ctrl & AURORA_ACR_PARITY_EN))
+		dev_warn(&pdev->dev, "tag parity is not enabled");
+	if (!(l2x0_aux_ctrl & AURORA_ACR_ECC_EN))
+		dev_warn(&pdev->dev, "data ECC is not enabled");
+
+	id = of_match_device(aurora_l2_edac_of_match, &pdev->dev);
+	dci->edac_check = aurora_l2_edac_poll;
+	dci->mod_name = pdev->dev.driver->name;
+	dci->ctl_name = id ? id->compatible : "unknown";
+	dci->dev_name = dev_name(&pdev->dev);
+
+	/* clear registers */
+	writel(AURORA_ERR_CNT_CLR, drvdata->base + AURORA_ERR_CNT_REG);
+	writel(AURORA_ERR_ATTR_CAP_VALID,
+	       drvdata->base + AURORA_ERR_ATTR_CAP_REG);
+
+	if (devm_edac_device_add_device(&pdev->dev, dci))
+		return -EINVAL;
+
+	drvdata->debugfs = edac_debugfs_create_dir(dev_name(&pdev->dev));
+	if (drvdata->debugfs) {
+		edac_debugfs_create_x32("inject_addr", 0644,
+					drvdata->debugfs,
+					&drvdata->inject_addr);
+		edac_debugfs_create_x32("inject_mask", 0644,
+					drvdata->debugfs,
+					&drvdata->inject_mask);
+		edac_debugfs_create_x8("inject_ctl", 0644,
+				       drvdata->debugfs, &drvdata->inject_ctl);
+	}
+
+	return 0;
+}
+
+static int aurora_l2_edac_remove(struct platform_device *pdev)
+{
+	struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);
+	struct aurora_l2_edac_drvdata *drvdata = dci->pvt_info;
+
+	edac_debugfs_remove_recursive(drvdata->debugfs);
+	return 0;
+}
+
+static struct platform_driver aurora_l2_edac_driver = {
+	.probe = aurora_l2_edac_probe,
+	.remove = aurora_l2_edac_remove,
+	.driver = {
+		.name = "aurora_l2_edac",
+		.of_match_table = of_match_ptr(aurora_l2_edac_of_match),
+	},
+};
+
+/************************ Driver registration ******************************/
+
+static struct platform_driver * const drivers[] = {
+	&armada_xp_mc_edac_driver,
+	&aurora_l2_edac_driver,
+};
+
+static int __init armada_xp_edac_init(void)
+{
+	int res = 0;
+
+	/* only polling is supported */
+	edac_op_state = EDAC_OPSTATE_POLL;
+
+	res = platform_register_drivers(drivers, ARRAY_SIZE(drivers));
+	if (res)
+		pr_warn("Aramda XP EDAC drivers fail to register\n");
+
+	return 0;
+}
+module_init(armada_xp_edac_init);
+
+static void __exit armada_xp_edac_exit(void)
+{
+	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
+}
+module_exit(armada_xp_edac_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Pengutronix");
+MODULE_DESCRIPTION("EDAC Drivers for Marvell Armada XP SDRAM and L2 Cache Controller");
-- 
2.11.0

[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[Borislav Petkov]

On Wed, Aug 02, 2017 at 02:39:13PM +0200, Jan Luebbe wrote:
> Chris Packham (2):
>   ARM: l2x0: support parity-enable/disable on aurora
>   ARM: l2x0: add marvell,ecc-enable property for aurora
> 
> Jan Luebbe (7):
>   ARM: l2c: move cache-aurora-l2.h to asm/hardware
>   ARM: aurora-l2: add prefix to MAX_RANGE_SIZE
>   ARM: aurora-l2: add defines for parity and ECC registers

I'd need an ACK from an ARM maintainer for those if the whole series is
going to go through the EDAC tree.

>   EDAC: Add missing debugfs_create_x32 wrapper
>   EDAC: Add devres helpers for
>     edac_mc_alloc/edac_mc_add_mc(_with_groups)
>   EDAC: Add devres helpers for
>     edac_device_alloc_ctl_info/edac_device_add_device
>   EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC

Alternatively, I can review those and they can go through an ARM tree.

I'm fine with whatever ARM maintainers prefer.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--

[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[Chris Packham]

On 03/08/17 00:39, Jan Luebbe wrote:
> This series adds drivers for the L2 cache and DDR RAM ECC functionality as
> found on the MV78230/MV78x60 SoCs. I've tested these changes with the MV78460
> (on a custom board with a DDR3 ECC DIMM).
> 
> Also contained in this series are an additional debugfs wrapper and devm_
> helpers for edac_mc_/edac_device_ allocation and registration, which make error
> handing and cleanup simpler.
> 
> Compared to the previous v1 series, the following changes have been made:
> - Add the aurora-l2 register defines earlier in the series (suggested by
>    Russell King and Gregory CLEMENT )
> - Changed the DT vendor prefix from "arm" to "marvell" for the ecc-enable/disable
>    properties on the aurora-l2 (suggested by Russell King)
> - Fix some warnings reported by checkpatch
> 
> Compared to the original RFC series, the following changes have been made:
> - Integrated Chris' patches for parity and ECC configuration via DT
> - Merged the DDR RAM and L2 cache drivers (as requested by Borislav, analogous
>    to fsl_ddr_edac.c and mpc85xx_edac.c)
> - Added myself to MAINTAINERS (requested by Borislav)
> - L2 cache: Track the msg size and use snprintf (review comment by Chris)
> - L2 cache: Split error injection from the check function (review comment by
>    Chris)
> - DDR RAM: Allow 16 bit width in addition to 32 and 64 bit (review comment by
>    Chris)

Thanks for that. I'll make my life easier when I add support for the 
narrower bus-width.

> - Use of_match_ptr() (review comments by Chris)
> - Minor checkpatch cleanups
> 
> Chris Packham (2):
>    ARM: l2x0: support parity-enable/disable on aurora
>    ARM: l2x0: add marvell,ecc-enable property for aurora
> 
> Jan Luebbe (7):
>    ARM: l2c: move cache-aurora-l2.h to asm/hardware
>    ARM: aurora-l2: add prefix to MAX_RANGE_SIZE
>    ARM: aurora-l2: add defines for parity and ECC registers
>    EDAC: Add missing debugfs_create_x32 wrapper
>    EDAC: Add devres helpers for
>      edac_mc_alloc/edac_mc_add_mc(_with_groups)
>    EDAC: Add devres helpers for
>      edac_device_alloc_ctl_info/edac_device_add_device
>    EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC
	
Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

[PATCH v2 9/9] EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC

[Chris Packham]

One comment

On 03/08/17 00:39, Jan Luebbe wrote:
> +struct armada_xp_mc_edac_drvdata {
> +	void __iomem *base;
> +
> +	unsigned int width; /* width in bytes */
> +	bool cs_addr_sel[SDRAM_NUM_CS]; /* bank interleaving */
> +
> +	char msg[128];
> +};
> +

...

> +static int armada_xp_mc_edac_read_config(struct mem_ctl_info *mci)
> +{
> +	struct armada_xp_mc_edac_drvdata *drvdata = mci->pvt_info;
> +	struct dimm_info *dimm;
> +	unsigned int i, cs_struct, cs_size;
> +	uint32_t config, addr_ctrl, rank_ctrl;
> +
> +	config = readl(drvdata->base + SDRAM_CONFIG_REG);
> +	if (!(config & SDRAM_CONFIG_ECC_MASK))
> +		dev_warn(mci->pdev, "SDRAM ECC is not enabled");
> +
> +	if (mci->tot_dimms != SDRAM_NUM_CS) {
> +		dev_err(mci->pdev, "Invaild number of DIMMs");
> +		return -EINVAL;
> +	}
> +
> +	if (config & SDRAM_CONFIG_BUS_WIDTH_MASK)
> +		drvdata->width = 4; /* 64 bit */
> +	else
> +		drvdata->width = 2; /* 32 bit */
> +

Should this be 8 and 4 instead of 4 and 2? The uses of this value are 
all consistent so there is no error but the numbers don't match the 
comment in struct armada_xp_mc_edac_drvdata.

[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[Jan Lübbe]

Hi Gregory and Borislav,

On Wed, 2017-08-02 at 16:05 +0200, Borislav Petkov wrote:
> On Wed, Aug 02, 2017 at 02:39:13PM +0200, Jan Luebbe wrote:
> > Chris Packham (2):
> > ? ARM: l2x0: support parity-enable/disable on aurora
> > ? ARM: l2x0: add marvell,ecc-enable property for aurora
> > 
> > Jan Luebbe (7):
> > ? ARM: l2c: move cache-aurora-l2.h to asm/hardware
> > ? ARM: aurora-l2: add prefix to MAX_RANGE_SIZE
> > ? ARM: aurora-l2: add defines for parity and ECC registers
> 
> I'd need an ACK from an ARM maintainer for those if the whole series
> is going to go through the EDAC tree.

Gregory, you've given Reviewed-by tags for some of these in version 1.?

Would you be fine with acking them and merging the series through the
EDAC tree?

> > ? EDAC: Add missing debugfs_create_x32 wrapper
> > ? EDAC: Add devres helpers for
> > ????edac_mc_alloc/edac_mc_add_mc(_with_groups)
> > ? EDAC: Add devres helpers for
> > ????edac_device_alloc_ctl_info/edac_device_add_device
> > ? EDAC: Add driver for the Marvell Armada XP SDRAM and L2 cache ECC
> 
> Alternatively, I can review those and they can go through an ARM
> tree.
> 
> I'm fine with whatever ARM maintainers prefer.

Thanks, if you have any review comments, please let me know.

Regards,
Jan

[PATCH v2 0/9] EDAC drivers for Armada XP L2 and DDR

[Russell King - ARM Linux]

On Mon, Aug 14, 2017 at 11:01:28AM +0200, Jan L?bbe wrote:
> Hi Gregory and Borislav,
> 
> On Wed, 2017-08-02 at 16:05 +0200, Borislav Petkov wrote:
> > On Wed, Aug 02, 2017 at 02:39:13PM +0200, Jan Luebbe wrote:
> > > Chris Packham (2):
> > > ? ARM: l2x0: support parity-enable/disable on aurora
> > > ? ARM: l2x0: add marvell,ecc-enable property for aurora
> > > 
> > > Jan Luebbe (7):
> > > ? ARM: l2c: move cache-aurora-l2.h to asm/hardware
> > > ? ARM: aurora-l2: add prefix to MAX_RANGE_SIZE
> > > ? ARM: aurora-l2: add defines for parity and ECC registers
> > 
> > I'd need an ACK from an ARM maintainer for those if the whole series
> > is going to go through the EDAC tree.
> 
> Gregory, you've given Reviewed-by tags for some of these in version 1.?
> 
> Would you be fine with acking them and merging the series through the
> EDAC tree?

Boris and myself agreed that I'd merge the entire series once the
EDAC bits have been reviewed.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 8.8Mbps down 630kbps up
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[PATCH v2 7/9] EDAC: Add devres helpers for edac_mc_alloc/edac_mc_add_mc(_with_groups)

[Borislav Petkov]

On Wed, Aug 02, 2017 at 02:39:20PM +0200, Jan Luebbe wrote:
> These helpers simplify error handling in the _probe functions and automate
> deallocation in the _remove functions.
> 
> Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
> ---
>  drivers/edac/edac_mc.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/edac/edac_mc.h | 26 ++++++++++++++++++++++++
>  2 files changed, 80 insertions(+)
> 
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 480072139b7a..d3ee2b851329 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -517,6 +517,34 @@ void edac_mc_free(struct mem_ctl_info *mci)
>  }
>  EXPORT_SYMBOL_GPL(edac_mc_free);
>  
> +/**
> + * devm_edac_mc_free() - Internal helper to call edac_mc_free from a devres
> + *	action.
> + */
> +static void devm_edac_mc_free(void *mci)
> +{
> +	edac_mc_free((struct mem_ctl_info *)mci);
> +}
> +
> +struct mem_ctl_info *devm_edac_mc_alloc(struct device *dev,
> +					unsigned int mc_num,
> +					unsigned int n_layers,
> +					struct edac_mc_layer *layers,
> +					unsigned int sz_pvt)
> +{
> +	struct mem_ctl_info *mci;
> +
> +	mci = edac_mc_alloc(mc_num, n_layers, layers, sz_pvt);
> +	if (!mci)
> +		return mci;
> +
> +	if (devm_add_action_or_reset(dev, devm_edac_mc_free, mci))
> +		return NULL;
> +
> +	return mci;
> +}
> +EXPORT_SYMBOL_GPL(devm_edac_mc_alloc);

Ok, I see what you want to do here but I'm not excited.

Rather, what I've been telling other EDAC driver writers is to first
probe the hardware as much as possible until they *know* they're all
ready to init and only then call the EDAC core to allocate structures.

Because, with this lazy method, the pointless memory allocation
and freeing would still happen if the late probing fails. But that
allocation and freeing is completely pointless.

So looking at armada_xp_mc_edac_probe(), for example, you should do
edac_mc_alloc() *after* armada_xp_mc_edac_read_config() has succeeded.
The same idea holds true for aurora_l2_edac_probe(): do all probing
and gathering of info from the hardware first and then call EDAC core
functions.

Thanks.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.