[PATCH v2 3/3] mfd: lpc_ich: Add support for Intel Apollo Lake GPIO pinctrl in non-ACPI system
From: Tan Jui Nee
Date: Tue Apr 26 2016 - 02:10:33 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>
---
drivers/mfd/Kconfig | 3 +-
drivers/mfd/lpc_ich.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 130 insertions(+), 1 deletion(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index eea61e3..54e595c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -359,8 +359,9 @@ 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 if X86_INTEL_NON_ACPI
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/lpc_ich.c b/drivers/mfd/lpc_ich.c
index bd3aa45..5d0cc9b 100644
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -68,6 +68,10 @@
#include <linux/mfd/core.h>
#include <linux/mfd/lpc_ich.h>
#include <linux/platform_data/itco_wdt.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/types.h>
+
+#include <asm/p2sb.h>
#define ACPIBASE 0x40
#define ACPIBASE_GPE_OFF 0x28
@@ -94,6 +98,19 @@
#define wdt_mem_res(i) wdt_res(ICH_RES_MEM_OFF, i)
#define wdt_res(b, i) (&wdt_ich_res[(b) + (i)])
+/* Offset data for Apollo Lake GPIO communities */
+#define APL_GPIO_SOUTHWEST_OFFSET 0xc0
+#define APL_GPIO_NORTHWEST_OFFSET 0xc4
+#define APL_GPIO_NORTH_OFFSET 0xc5
+#define APL_GPIO_WEST_OFFSET 0xc7
+
+#define APL_GPIO_SOUTHWEST_END (43 * 0x8)
+#define APL_GPIO_NORTHWEST_END (77 * 0x8)
+#define APL_GPIO_NORTH_END (90 * 0x8)
+#define APL_GPIO_WEST_END (47 * 0x8)
+
+#define APL_GPIO_IRQ 14
+
struct lpc_ich_priv {
int chipset;
@@ -133,6 +150,50 @@ static struct resource gpio_ich_res[] = {
},
};
+#ifdef CONFIG_X86_INTEL_NON_ACPI
+static struct resource apl_gpio_io_res[][2] = {
+ {
+ {
+ .start = APL_GPIO_NORTH_OFFSET << 16,
+ .end = (APL_GPIO_NORTH_OFFSET << 16)
+ + APL_GPIO_NORTH_END,
+ },
+ },
+ {
+ {
+ .start = APL_GPIO_NORTHWEST_OFFSET << 16,
+ .end = (APL_GPIO_NORTHWEST_OFFSET << 16)
+ + APL_GPIO_NORTHWEST_END,
+ },
+ },
+ {
+ {
+ .start = APL_GPIO_WEST_OFFSET << 16,
+ .end = (APL_GPIO_WEST_OFFSET << 16)
+ + APL_GPIO_WEST_END,
+ },
+ },
+ {
+ {
+ .start = APL_GPIO_SOUTHWEST_OFFSET << 16,
+ .end = (APL_GPIO_SOUTHWEST_OFFSET << 16)
+ + APL_GPIO_SOUTHWEST_END,
+ },
+ },
+};
+
+static struct pinctrl_pin_desc apl_pinctrl_pdata;
+
+static struct mfd_cell apl_gpio_devices = {
+ .name = "apl-pinctrl",
+ .num_resources = ARRAY_SIZE(apl_gpio_io_res),
+ .resources = apl_gpio_io_res[1],
+ .pdata_size = sizeof(apl_pinctrl_pdata),
+ .platform_data = &apl_pinctrl_pdata,
+ .ignore_resource_conflicts = true,
+};
+#endif /* CONFIG_X86_INTEL_NON_ACPI */
+
static struct mfd_cell lpc_ich_wdt_cell = {
.name = "iTCO_wdt",
.num_resources = ARRAY_SIZE(wdt_ich_res),
@@ -216,6 +277,7 @@ 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 +593,10 @@ 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 +745,7 @@ 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},
@@ -1050,6 +1117,64 @@ wdt_done:
return ret;
}
+#ifdef CONFIG_X86_INTEL_NON_ACPI
+static int lpc_ich_misc(struct pci_dev *dev, enum lpc_chipsets chipset)
+{
+ unsigned int apl_p2sb = PCI_DEVFN(0x0d, 0);
+ unsigned int i;
+ int ret;
+
+ switch (chipset) {
+ case LPC_APL:
+ /*
+ * Apollo lake, has not 1, but 4 gpio controllers,
+ * handle it a bit differently.
+ */
+
+ for (i = 0; i < ARRAY_SIZE(apl_gpio_io_res); i++) {
+ struct resource *res = apl_gpio_io_res[i];
+
+ apl_gpio_devices.resources = res;
+
+ /* Fill MEM resource */
+ ret = p2sb_bar(dev, apl_p2sb, res++);
+ if (ret)
+ goto warn_continue;
+
+ /* Fill IRQ resource */
+ res->start = APL_GPIO_IRQ;
+ res->end = res->start;
+ res->flags = IORESOURCE_IRQ;
+
+ apl_pinctrl_pdata.name = kasprintf(GFP_KERNEL, "%u",
+ i + 1);
+ if (apl_pinctrl_pdata.name)
+ ret = mfd_add_devices(&dev->dev, i,
+ &apl_gpio_devices, 1, 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);
+ }
+ break;
+ default:
+ return -ENODEV;
+ }
+ return 0;
+}
+#else
+static inline int lpc_ich_misc(struct pci_dev *dev, enum lpc_chipsets chipset)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_X86_INTEL_NON_ACPI */
+
static int lpc_ich_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
@@ -1093,6 +1218,9 @@ static int lpc_ich_probe(struct pci_dev *dev,
cell_added = true;
}
+ if (!lpc_ich_misc(dev, priv->chipset))
+ cell_added = true;
+
/*
* We only care if at least one or none of the cells registered
* successfully.
--
1.9.1