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mfd: watchdog: iTCO_wdt: Expose watchdog properties using platform data 

Intel Sunrisepoint (Skylake PCH) has the iTCO watchdog accessible across
the SMBus, unlike previous generations of PCH/ICH where it was on the
LPC bus. Because it's on the SMBus, it doesn't make sense to pass around
a 'struct lpc_ich_info', and leaking the type of bus into the iTCO
watchdog driver is kind of backwards anyway.

This change introduces a new 'struct itco_wdt_platform_data' for use
inside the iTCO watchdog driver and by the upcoming Intel Sunrisepoint
code, which neatly avoids having to include lpc_ich headers in the i801
i2c driver.

This change is overdue because lpc_ich_info has already found its way
into other TCO watchdog users, notably the intel_pmc_ipc driver where
the watchdog actually isn't on the LPC bus as far as I can see.

A simple translation layer is provided for converting from the existing
'struct lpc_ich_info' inside the lpc_ich mfd driver.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Acked-by: Darren Hart <dvhart@linux.intel.com> [drivers/x86 refactoring]
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Matt Fleming 2015-08-06 13:46:24 +01:00 committed by Lee Jones
parent bc0195aad0
commit 420b54de25
5 changed files with 57 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/mfd/lpc_ich.c
View File

@ -66,6 +66,7 @@
#include <linux/pci.h>
#include <linux/mfd/core.h>
#include <linux/mfd/lpc_ich.h>
#include <linux/platform_data/itco_wdt.h>
#define ACPIBASE 0x40
#define ACPIBASE_GPE_OFF 0x28
@ -835,9 +836,31 @@ static void lpc_ich_enable_pmc_space(struct pci_dev *dev)
priv->actrl_pbase_save = reg_save;
}
static void lpc_ich_finalize_cell(struct pci_dev *dev, struct mfd_cell *cell)
static int lpc_ich_finalize_wdt_cell(struct pci_dev *dev)
{
struct itco_wdt_platform_data *pdata;
struct lpc_ich_priv *priv = pci_get_drvdata(dev);
struct lpc_ich_info *info;
struct mfd_cell *cell = &lpc_ich_cells[LPC_WDT];
pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
info = &lpc_chipset_info[priv->chipset];
pdata->version = info->iTCO_version;
strlcpy(pdata->name, info->name, sizeof(pdata->name));
cell->platform_data = pdata;
cell->pdata_size = sizeof(*pdata);
return 0;
}
static void lpc_ich_finalize_gpio_cell(struct pci_dev *dev)
{
struct lpc_ich_priv *priv = pci_get_drvdata(dev);
struct mfd_cell *cell = &lpc_ich_cells[LPC_GPIO];
cell->platform_data = &lpc_chipset_info[priv->chipset];
cell->pdata_size = sizeof(struct lpc_ich_info);
@ -933,7 +956,7 @@ gpe0_done:
lpc_chipset_info[priv->chipset].use_gpio = ret;
lpc_ich_enable_gpio_space(dev);
lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_GPIO]);
lpc_ich_finalize_gpio_cell(dev);
ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
&lpc_ich_cells[LPC_GPIO], 1, NULL, 0, NULL);
@ -1007,7 +1030,10 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
res->end = base_addr + ACPIBASE_PMC_END;
}
lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_WDT]);
ret = lpc_ich_finalize_wdt_cell(dev);
if (ret)
goto wdt_done;
ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
&lpc_ich_cells[LPC_WDT], 1, NULL, 0, NULL);

9
drivers/platform/x86/intel_pmc_ipc.c
View File

@ -33,7 +33,7 @@
#include <linux/suspend.h>
#include <linux/acpi.h>
#include <asm/intel_pmc_ipc.h>
#include <linux/mfd/lpc_ich.h>
#include <linux/platform_data/itco_wdt.h>
/*
* IPC registers
@ -460,9 +460,9 @@ static struct resource tco_res[] = {
},
};
static struct lpc_ich_info tco_info = {
static struct itco_wdt_platform_data tco_info = {
.name = "Apollo Lake SoC",
.iTCO_version = 3,
.version = 3,
};
static int ipc_create_punit_device(void)
@ -539,8 +539,7 @@ static int ipc_create_tco_device(void)
goto err;
}
ret = platform_device_add_data(pdev, &tco_info,
sizeof(struct lpc_ich_info));
ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
if (ret) {
dev_err(ipcdev.dev, "Failed to add tco platform data\n");
goto err;

11
drivers/watchdog/iTCO_wdt.c
View File

@ -66,8 +66,7 @@
#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include <linux/io.h> /* For inb/outb/... */
#include <linux/mfd/core.h>
#include <linux/mfd/lpc_ich.h>
#include <linux/platform_data/itco_wdt.h>
#include "iTCO_vendor.h"
@ -418,9 +417,9 @@ static int iTCO_wdt_probe(struct platform_device *dev)
{
int ret = -ENODEV;
unsigned long val32;
struct lpc_ich_info *ich_info = dev_get_platdata(&dev->dev);
struct itco_wdt_platform_data *pdata = dev_get_platdata(&dev->dev);
if (!ich_info)
if (!pdata)
goto out;
spin_lock_init(&iTCO_wdt_private.io_lock);
@ -435,7 +434,7 @@ static int iTCO_wdt_probe(struct platform_device *dev)
if (!iTCO_wdt_private.smi_res)
goto out;
iTCO_wdt_private.iTCO_version = ich_info->iTCO_version;
iTCO_wdt_private.iTCO_version = pdata->version;
iTCO_wdt_private.dev = dev;
iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
@ -501,7 +500,7 @@ static int iTCO_wdt_probe(struct platform_device *dev)
}
pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
ich_info->name, ich_info->iTCO_version, (u64)TCOBASE);
pdata->name, pdata->version, (u64)TCOBASE);
/* Clear out the (probably old) status */
if (iTCO_wdt_private.iTCO_version == 3) {

6
include/linux/mfd/lpc_ich.h
View File

@ -20,12 +20,6 @@
#ifndef LPC_ICH_H
#define LPC_ICH_H
/* Watchdog resources */
#define ICH_RES_IO_TCO 0
#define ICH_RES_IO_SMI 1
#define ICH_RES_MEM_OFF 2
#define ICH_RES_MEM_GCS_PMC 0
/* GPIO resources */
#define ICH_RES_GPIO 0
#define ICH_RES_GPE0 1

19
include/linux/platform_data/itco_wdt.h Normal file
View File

@ -0,0 +1,19 @@
/*
* Platform data for the Intel TCO Watchdog
*/
#ifndef _ITCO_WDT_H_
#define _ITCO_WDT_H_
/* Watchdog resources */
#define ICH_RES_IO_TCO 0
#define ICH_RES_IO_SMI 1
#define ICH_RES_MEM_OFF 2
#define ICH_RES_MEM_GCS_PMC 0
struct itco_wdt_platform_data {
char name[32];
unsigned int version;
};
#endif /* _ITCO_WDT_H_ */