[PATCH v5 3/3] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system

From: Tan Jui Nee
Date: Tue Jun 28 2016 - 03:58:34 EST

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@xxxxxxxxx>
---
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

arch/x86/Kconfig | 9 ++++
drivers/mfd/Kconfig | 3 +-
drivers/mfd/Makefile | 2 +-
drivers/mfd/lpc_ich-apl.c | 126 ++++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/lpc_ich-core.c | 11 ++++
include/linux/mfd/lpc_ich.h | 7 +++
6 files changed, 156 insertions(+), 2 deletions(-)
create mode 100644 drivers/mfd/lpc_ich-apl.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d305d81..e1865c7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -498,6 +498,15 @@ config X86_GOLDFISH
for Android development. Unless you are building for the Android
Goldfish emulator say N here.

+config X86_INTEL_APL
+ bool "Non-ACPI support for Intel Apollo Lake platforms"
+ select PINCTRL
+ ---help---
+ Select this option to enable MMIO BAR access over the P2SB for
+ non-ACPI Intel Apollo Lake SoC platforms. This driver uses the P2SB
+ hide/unhide mechanism cooperatively to pass the PCI BAR address to
+ the platform driver, currently GPIO.
+
config X86_INTEL_CE
bool "CE4100 TV platform"
depends on PCI
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1bcf601..dc4e543 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -369,8 +369,9 @@ 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 1dfe5fb..7572c1f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -155,7 +155,7 @@ 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
+lpc_ich-objs := lpc_ich-core.o lpc_ich-apl.o
obj-$(CONFIG_LPC_ICH) += lpc_ich.o
obj-$(CONFIG_MFD_RDC321X) += rdc321x-southbridge.o
obj-$(CONFIG_MFD_JANZ_CMODIO) += janz-cmodio.o
diff --git a/drivers/mfd/lpc_ich-apl.c b/drivers/mfd/lpc_ich-apl.c
new file mode 100644
index 0000000..544e83a
--- /dev/null
+++ b/drivers/mfd/lpc_ich-apl.c
@@ -0,0 +1,126 @@
+/*
+ * Purpose: Create a platform device to bind with Intel Apollo Lake
+ * Pinctrl GPIO platform driver
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * 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 <linux/mfd/core.h>
+#include <linux/mfd/lpc_ich.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <asm/p2sb.h>
+
+#if defined(CONFIG_X86_INTEL_APL)
+/* 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_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 pinctrl_pin_desc apl_pinctrl_pdata;
+
+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,
+ .pdata_size = sizeof(apl_pinctrl_pdata),
+ .platform_data = &apl_pinctrl_pdata,
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 1,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = apl_gpio_io_res,
+ .pdata_size = sizeof(apl_pinctrl_pdata),
+ .platform_data = &apl_pinctrl_pdata,
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 2,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = apl_gpio_io_res,
+ .pdata_size = sizeof(apl_pinctrl_pdata),
+ .platform_data = &apl_pinctrl_pdata,
+ .ignore_resource_conflicts = true,
+ },
+ {
+ .name = "apl-pinctrl",
+ .id = 3,
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = apl_gpio_io_res,
+ .pdata_size = sizeof(apl_pinctrl_pdata),
+ .platform_data = &apl_pinctrl_pdata,
+ .ignore_resource_conflicts = true,
+ },
+};
+
+int lpc_ich_misc(struct pci_dev *dev)
+{
+ unsigned int apl_p2sb = PCI_DEVFN(PCI_IDSEL_P2SB, 0);
+ unsigned int i;
+ int ret;
+
+ /*
+ * Apollo lake, has not 1, but 4 gpio controllers,
+ * handle it a bit differently.
+ */
+
+ for (i = 0; i < ARRAY_SIZE(apl_gpio_io_res)-1; i++) {
+ struct resource *res = &apl_gpio_io_res[i];
+
+ apl_gpio_devices[i].resources = res;
+
+ /* Fill MEM resource */
+ ret = p2sb_bar(dev, apl_p2sb, res++);
+ if (ret)
+ goto warn_continue;
+
+ apl_pinctrl_pdata.name = kasprintf(GFP_KERNEL, "%u",
+ i + 1);
+ }
+
+ if (apl_pinctrl_pdata.name)
+ ret = mfd_add_devices(&dev->dev, apl_gpio_devices->id,
+ apl_gpio_devices, ARRAY_SIZE(apl_gpio_devices),
+ NULL, 0, NULL);
+ else
+ ret = -ENOMEM;
+
+warn_continue:
+ if (ret)
+ dev_warn(&dev->dev,
+ "Failed to add Apollo Lake GPIO %s: %d\n",
+ apl_pinctrl_pdata.name, ret);
+
+ kfree(apl_pinctrl_pdata.name);
+ return 0;
+}
+#endif
diff --git a/drivers/mfd/lpc_ich-core.c b/drivers/mfd/lpc_ich-core.c
index bd3aa45..1e957d4 100644
--- a/drivers/mfd/lpc_ich-core.c
+++ b/drivers/mfd/lpc_ich-core.c
@@ -216,6 +216,7 @@ enum lpc_chipsets {
LPC_BRASWELL, /* Braswell SoC */
LPC_LEWISBURG, /* Lewisburg */
LPC_9S, /* 9 Series */
+ LPC_APL, /* Apollo Lake SoC */
};

static struct lpc_ich_info lpc_chipset_info[] = {
@@ -531,6 +532,10 @@ static struct lpc_ich_info lpc_chipset_info[] = {
.name = "9 Series",
.iTCO_version = 2,
},
+ [LPC_APL] = {
+ .name = "Apollo Lake SoC",
+ .iTCO_version = 5,
+ },
};

/*
@@ -679,6 +684,7 @@ static const struct pci_device_id lpc_ich_ids[] = {
{ PCI_VDEVICE(INTEL, 0x3b14), LPC_3420},
{ PCI_VDEVICE(INTEL, 0x3b16), LPC_3450},
{ PCI_VDEVICE(INTEL, 0x5031), LPC_EP80579},
+ { PCI_VDEVICE(INTEL, 0x5ae8), LPC_APL},
{ PCI_VDEVICE(INTEL, 0x8c40), LPC_LPT},
{ PCI_VDEVICE(INTEL, 0x8c41), LPC_LPT},
{ PCI_VDEVICE(INTEL, 0x8c42), LPC_LPT},
@@ -1093,6 +1099,11 @@ static int lpc_ich_probe(struct pci_dev *dev,
cell_added = true;
}

+ if (priv->chipset == LPC_APL) {
+ ret = lpc_ich_misc(dev);
+ if (!ret)
+ cell_added = true;
+ }
/*
* We only care if at least one or none of the cells registered
* successfully.
diff --git a/include/linux/mfd/lpc_ich.h b/include/linux/mfd/lpc_ich.h
index 2b300b4..c5d0adc 100644
--- a/include/linux/mfd/lpc_ich.h
+++ b/include/linux/mfd/lpc_ich.h
@@ -43,4 +43,11 @@ struct lpc_ich_info {
u8 use_gpio;
};

+#if defined(CONFIG_X86_INTEL_APL)
+int lpc_ich_misc(struct pci_dev *dev);
+#else
+static inline int lpc_ich_misc(struct pci_dev *dev)
+{ return -ENODEV; }
+#endif
+
#endif
--
1.9.1