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>
diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
index 8de3439..c5a9a08 100644
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -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 @@
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 @@
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 @@
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);