[PATCH v7 6/6] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system

Tan Jui Nee
2016-09-28T09:54:23Z

This driver uses the P2SB hide/unhide mechanism cooperatively
to pass the PCI BAR address to the gpio platform driver.

Signed-off-by: Tan Jui Nee <jui.nee.tan@intel.com>
---
Changes in V7:
- Add author information and rewrite description of source file
lpc_ich-apl.c and lpc_ich_apl.h.
- Sort the header files by alphabetical order in lpc_ich-apl.c.
- Rename header file lpc_ich-apl.h to lpc_ich_apl.h (suggested by Lee).
- Remove unneeded pdata_size and platform_data from mfd_cell.
Also, remove unneeded apl_pinctrl_pdata.
- Since variable apl_p2sb is only used once, hence switch it out for the
PCI_DEVFN macro (suggested by Lee).
- Define APL_GPIO_COMMUNITY_MAX as total Apollo Lake GPIO communities
supported.
- Set resources in mfd_cell for each GPIO community.
- Call p2sb_bar() function once instead of four times inside the for loop.
And make p2sb_bar() function just to fill in the base address into a
scratch "struct resource" and have the loop do the additions to base/end.
- Remove entire apl_pinctrl_pdata.name memory allocation since it is no
longer needed.
- Return ret at the end of lpc_ich_add_gpio() function.

Changes in V6:
- Rename CONFIG_X86_INTEL_APL to CONFIG_X86_INTEL_IVI so that it
relates to the actual product, as suggested by Mika.
- Rework Makefile according Andy's comments.
- Rename lpc_ich_misc() to lpc_ich_add_gpio() so that the name should not
be so generic, as suggested by Andy.
- Call lpc_ich_add_gpio() via priv->chipset.
- lpc_ich_add_gpio() function will be moved from
.../include/linux/mfd/lpc_ich.h to
.../drivers/mfd/lpc_ich-apl.h
as this is a part of internal driver interface as suggested by Andy.
- Move enum lpc_chipsets from
.../drivers/mfd/lpc_ich-core.c to
.../include/linux/mfd/lpc_ich.h
as lpc_chipsets is also accessed by lpc_ich_add_gpio().
- Check if kasprintf return value for all 4 gpio controllers before
proceed to add platform device by using mfd_add_devices().

Changes in V5:
- Split lpc-ich driver into two parts (lpc_ich-core and lpc_ich-apl).
The file lpc_ich-apl.c introduces gpio platform driver in MFD.
- Rename Kconfig option CONFIG_X86_INTEL_NON_ACPI to CONFIG_X86_INTEL_APL
so that it reflects actual product as suggested by Mika.

Changes in V4:
- Move Kconfig option CONFIG_X86_INTEL_NON_ACPI from
[PATCH 2/3] x86/platform/p2sb: New Primary to Sideband bridge support driver for Intel SOC's
to
[PATCH 3/3] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system
since the config is used in latter patch.
- Select CONFIG_P2SB when CONFIG_LPC_ICH is enabled.
- Remove #ifdef CONFIG_X86_INTEL_NON_ACPI and use
#if defined(CONFIG_X86_INTEL_NON_ACPI) when lpc_ich_misc is called
as suggested by Lee Jones.
- Use single dimensional array instead of 2D array for apl_gpio_io_res
structure and use DEFINE_RES_IRQ for its IRQ resource.

Changes in V3:
- Simplify register addresses calculation and use DEFINE_RES_MEM_NAMED
defines for apl_gpio_io_res structure
- Define magic number for P2SB PCI ID
- Replace switch-case with if-else since currently we have only one
use case
- Only call mfd_add_devices() once for all gpio communities

Changes in V2:
- Add new config option CONFIG_X86_INTEL_NON_ACPI and "select PINCTRL"
to fix kbuildbot error

drivers/mfd/Kconfig | 3 +-
drivers/mfd/Makefile | 5 +-
drivers/mfd/lpc_ich-apl.c | 120 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/lpc_ich-core.c | 5 ++
drivers/mfd/lpc_ich_apl.h | 29 +++++++++++
5 files changed, 160 insertions(+), 2 deletions(-)
create mode 100644 drivers/mfd/lpc_ich-apl.c
create mode 100644 drivers/mfd/lpc_ich_apl.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 2d1fb64..8838e55 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -380,8 +380,9 @@ config MFD_INTEL_QUARK_I2C_GPIO

config LPC_ICH
tristate "Intel ICH LPC"
- depends on PCI
+ depends on X86 && PCI
select MFD_CORE
+ select P2SB
help
The LPC bridge function of the Intel ICH provides support for
many functional units. This driver provides needed support for
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 260f46f..3ad16c9 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -155,8 +155,11 @@ obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
obj-$(CONFIG_MFD_KEMPLD) += kempld-core.o
obj-$(CONFIG_MFD_INTEL_QUARK_I2C_GPIO) += intel_quark_i2c_gpio.o
obj-$(CONFIG_LPC_SCH) += lpc_sch.o
-lpc_ich-objs := lpc_ich-core.o
obj-$(CONFIG_LPC_ICH) += lpc_ich.o
+lpc_ich-objs := lpc_ich-core.o
+ifeq ($(CONFIG_X86_INTEL_IVI),y)
+lpc_ich-objs += lpc_ich-apl.o
+endif
obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
obj-$(CONFIG_MFD_JZ4740_ADC) += jz4740-adc.o
diff --git a/drivers/mfd/lpc_ich-apl.c b/drivers/mfd/lpc_ich-apl.c
new file mode 100644
index 0000000..7a79052
--- /dev/null
+++ b/drivers/mfd/lpc_ich-apl.c
@@ -0,0 +1,120 @@
+/*
+ * Intel Apollo Lake In-Vehicle Infotainment (IVI) systems used in cars support
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Author: Tan, Jui Nee <jui.nee.tan@intel.com>
+ *
+ * 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.
+ */
+
+#include <asm/p2sb.h>
+#include <linux/pci.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/lpc_ich.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#include "lpc_ich_apl.h"
+
+/* Offset data for Apollo Lake GPIO communities */
+#define APL_GPIO_SOUTHWEST_OFFSET 0xc00000
+#define APL_GPIO_NORTHWEST_OFFSET 0xc40000
+#define APL_GPIO_NORTH_OFFSET 0xc50000
+#define APL_GPIO_WEST_OFFSET 0xc70000
+
+#define APL_GPIO_SOUTHWEST_NPIN 43
+#define APL_GPIO_NORTHWEST_NPIN 77
+#define APL_GPIO_NORTH_NPIN 78
+#define APL_GPIO_WEST_NPIN 47
+
+#define APL_GPIO_COMMUNITY_MAX 4
+
+#define APL_GPIO_IRQ 14
+
+#define PCI_IDSEL_P2SB 0x0d
+
+static struct resource apl_gpio_io_res[] = {
+ DEFINE_RES_MEM_NAMED(APL_GPIO_NORTH_OFFSET,
+ APL_GPIO_NORTH_NPIN * SZ_8, "apl_pinctrl_n"),
+ DEFINE_RES_MEM_NAMED(APL_GPIO_NORTHWEST_OFFSET,
+ APL_GPIO_NORTHWEST_NPIN * SZ_8, "apl_pinctrl_nw"),
+ DEFINE_RES_MEM_NAMED(APL_GPIO_WEST_OFFSET,
+ APL_GPIO_WEST_NPIN * SZ_8, "apl_pinctrl_w"),
+ DEFINE_RES_MEM_NAMED(APL_GPIO_SOUTHWEST_OFFSET,
+ APL_GPIO_SOUTHWEST_NPIN * SZ_8, "apl_pinctrl_sw"),
+ DEFINE_RES_IRQ(APL_GPIO_IRQ),
+};
+
+static struct mfd_cell apl_gpio_devices[] = {
+ {
+ .name = "apl-pinctrl",
+ .id = 0,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = &apl_gpio_io_res[0],
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 1,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = &apl_gpio_io_res[1],
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 2,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = &apl_gpio_io_res[2],
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 3,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = &apl_gpio_io_res[3],
+ .ignore_resource_conflicts = true,
+ },
+};
+
+int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset)
+{
+ unsigned int i;
+ int ret;
+ struct resource base;
+
+ if (chipset != LPC_APL)
+ return -ENODEV;
+ /*
+ * Apollo lake, has not 1, but 4 gpio controllers,
+ * handle it a bit differently.
+ */
+
+ ret = p2sb_bar(dev, PCI_DEVFN(PCI_IDSEL_P2SB, 0), &base);
+ if (ret)
+ goto warn_continue;
+
+ for (i = 0; i < APL_GPIO_COMMUNITY_MAX; i++) {
+ struct resource *res = &apl_gpio_io_res[i];
+
+ /* Fill MEM resource */
+ res->start += base.start;
+ res->end += base.start;
+ res->flags = base.flags;
+
+ res++;
+ }
+
+ ret = mfd_add_devices(&dev->dev, 0,
+ apl_gpio_devices, ARRAY_SIZE(apl_gpio_devices),
+ NULL, 0, NULL);
+
+ if (ret)
+warn_continue:
+ dev_warn(&dev->dev,
+ "Failed to add Apollo Lake GPIO: %d\n",
+ ret);
+
+ return ret;
+}
diff --git a/drivers/mfd/lpc_ich-core.c b/drivers/mfd/lpc_ich-core.c
index 589155c..a15cc9f 100644
--- a/drivers/mfd/lpc_ich-core.c
+++ b/drivers/mfd/lpc_ich-core.c
@@ -70,6 +70,8 @@
#include <linux/mfd/lpc_ich.h>
#include <linux/platform_data/itco_wdt.h>

+#include "lpc_ich_apl.h"
+
#define ACPIBASE 0x40
#define ACPIBASE_GPE_OFF 0x28
#define ACPIBASE_GPE_END 0x2f
@@ -1028,6 +1030,9 @@ static int lpc_ich_probe(struct pci_dev *dev,
cell_added = true;
}

+ if (!lpc_ich_add_gpio(dev, priv->chipset))
+ cell_added = true;
+
/*
* We only care if at least one or none of the cells registered
* successfully.
diff --git a/drivers/mfd/lpc_ich_apl.h b/drivers/mfd/lpc_ich_apl.h
new file mode 100644
index 0000000..c82faa6
--- /dev/null
+++ b/drivers/mfd/lpc_ich_apl.h
@@ -0,0 +1,29 @@
+/*
+ * lpc_ich-apl.h - Intel In-Vehicle Infotainment (IVI) systems used in cars
+ * support
+ *
+ * Copyright (C) 2016, Intel Corporation
+ *
+ * Author: Tan, Jui Nee <jui.nee.tan@intel.com>
+ *
+ * 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.
+ */
+
+#ifndef __LPC_ICH_APL_H__
+#define __LPC_ICH_APL_H__
+
+#include <linux/pci.h>
+
+#if IS_ENABLED(CONFIG_X86_INTEL_IVI)
+int lpc_ich_add_gpio(struct pci_dev *dev, enum lpc_chipsets chipset);
+#else /* CONFIG_X86_INTEL_IVI is not set */
+static inline int lpc_ich_add_gpio(struct pci_dev *dev,
+ enum lpc_chipsets chipset)
+{
+ return -ENODEV;
+}
+#endif
+
+#endif
--
1.9.1