[PATCH 12/12] watchdog: sp5100_tco: Add support for recent FCH versions
From: Guenter Roeck
Date: Sun Dec 24 2017 - 16:04:55 EST
Starting with Family 16h Models 30h-3Fh and Family 15h Models 60h-6Fh,
watchdog address space decoding has changed. The cutover point is already
identified in the i2c-piix2 driver, so use the same mechanism.
Cc: ZoltÃn BÃszÃrmÃnyi <zboszor@xxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/watchdog/sp5100_tco.c | 169 ++++++++++++++++++++++++++++--------------
drivers/watchdog/sp5100_tco.h | 21 ++++++
2 files changed, 133 insertions(+), 57 deletions(-)
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index 23246cb40598..41aaae2d5287 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -16,6 +16,11 @@
* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
* AMD Publication 45482 "AMD SB800-Series Southbridges Register
* Reference Guide"
+ * AMD Publication 48751 "BIOS and Kernel Developerâs Guide (BKDG)
+ * for AMD Family 16h Models 00h-0Fh Processors"
+ * AMD Publication 51192 "AMD Bolton FCH Register Reference Guide"
+ * AMD Publication 52740 "BIOS and Kernel Developerâs Guide (BKDG)
+ * for AMD Family 16h Models 30h-3Fh Processors"
*/
/*
@@ -40,9 +45,14 @@
/* internal variables */
+enum tco_reg_layout {
+ sp5100, sb800, efch
+};
+
struct sp5100_tco {
struct watchdog_device wdd;
void __iomem *tcobase;
+ enum tco_reg_layout tco_reg_layout;
};
/* the watchdog platform device */
@@ -67,10 +77,20 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
* Some TCO specific functions
*/
-static bool tco_has_sp5100_reg_layout(struct pci_dev *dev)
+static enum tco_reg_layout tco_reg_layout(struct pci_dev *dev)
{
- return dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
- dev->revision < 0x40;
+ if (dev->vendor == PCI_VENDOR_ID_ATI &&
+ dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
+ dev->revision < 0x40) {
+ return sp5100;
+ } else if (dev->vendor == PCI_VENDOR_ID_AMD &&
+ ((dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
+ dev->revision >= 0x41) ||
+ (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
+ dev->revision >= 0x49))) {
+ return efch;
+ }
+ return sb800;
}
static int tco_timer_start(struct watchdog_device *wdd)
@@ -139,9 +159,12 @@ static void sp5100_tco_update_pm_reg8(u8 index, u8 reset, u8 set)
outb(val, SP5100_IO_PM_DATA_REG);
}
-static void tco_timer_enable(void)
+static void tco_timer_enable(struct sp5100_tco *tco)
{
- if (!tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
+ u32 val;
+
+ switch (tco->tco_reg_layout) {
+ case sb800:
/* For SB800 or later */
/* Set the Watchdog timer resolution to 1 sec */
sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONFIG,
@@ -151,9 +174,8 @@ static void tco_timer_enable(void)
sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONTROL,
~SB800_PM_WATCHDOG_DISABLE,
SB800_PCI_WATCHDOG_DECODE_EN);
- } else {
- u32 val;
-
+ break;
+ case sp5100:
/* For SP5100 or SB7x0 */
/* Enable watchdog decode bit */
pci_read_config_dword(sp5100_tco_pci,
@@ -170,6 +192,13 @@ static void tco_timer_enable(void)
sp5100_tco_update_pm_reg8(SP5100_PM_WATCHDOG_CONTROL,
~SP5100_PM_WATCHDOG_DISABLE,
SP5100_PM_WATCHDOG_SECOND_RES);
+ break;
+ case efch:
+ /* Set the Watchdog timer resolution to 1 sec and enable */
+ sp5100_tco_update_pm_reg8(EFCH_PM_DECODEEN3,
+ ~EFCH_PM_WATCHDOG_DISABLE,
+ EFCH_PM_DECODEEN_SECOND_RES);
+ break;
}
}
@@ -189,89 +218,113 @@ static int sp5100_tco_setupdevice(struct device *dev,
{
struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
const char *dev_name;
- u8 base_addr;
- u32 val;
+ u32 mmio_addr = 0, val;
int ret;
- /*
- * Determine type of southbridge chipset.
- */
- if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
- dev_name = SP5100_DEVNAME;
- base_addr = SP5100_PM_WATCHDOG_BASE;
- } else {
- dev_name = SB800_DEVNAME;
- base_addr = SB800_PM_WATCHDOG_BASE;
- }
-
/* Request the IO ports used by this driver */
if (!request_muxed_region(SP5100_IO_PM_INDEX_REG,
- SP5100_PM_IOPORTS_SIZE, dev_name)) {
+ SP5100_PM_IOPORTS_SIZE, "sp5100_tco")) {
dev_err(dev, "I/O address 0x%04x already in use\n",
SP5100_IO_PM_INDEX_REG);
return -EBUSY;
}
/*
- * First, Find the watchdog timer MMIO address from indirect I/O.
- * Low three bits of BASE are reserved.
+ * Determine type of southbridge chipset.
*/
- val = sp5100_tco_read_pm_reg32(base_addr) & 0xfffffff8;
-
- dev_dbg(dev, "Got 0x%04x from indirect I/O\n", val);
+ switch (tco->tco_reg_layout) {
+ case sp5100:
+ dev_name = SP5100_DEVNAME;
+ mmio_addr = sp5100_tco_read_pm_reg32(SP5100_PM_WATCHDOG_BASE) &
+ 0xfffffff8;
+ break;
+ case sb800:
+ dev_name = SB800_DEVNAME;
+ mmio_addr = sp5100_tco_read_pm_reg32(SB800_PM_WATCHDOG_BASE) &
+ 0xfffffff8;
+ break;
+ case efch:
+ dev_name = SB800_DEVNAME;
+ val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN);
+ if (val & EFCH_PM_DECODEEN_WDT_TMREN)
+ mmio_addr = EFCH_PM_WDT_ADDR;
+ break;
+ default:
+ return -ENODEV;
+ }
/* Check MMIO address conflict */
- if (!devm_request_mem_region(dev, val, SP5100_WDT_MEM_MAP_SIZE,
+ if (!mmio_addr ||
+ !devm_request_mem_region(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE,
dev_name)) {
- dev_dbg(dev, "MMIO address 0x%04x already in use\n", val);
- /*
- * Secondly, Find the watchdog timer MMIO address
- * from SBResource_MMIO register.
- */
- if (tco_has_sp5100_reg_layout(sp5100_tco_pci)) {
+ if (mmio_addr)
+ dev_dbg(dev, "MMIO address 0x%08x already in use\n",
+ mmio_addr);
+ switch (tco->tco_reg_layout) {
+ case sp5100:
+ /*
+ * Secondly, Find the watchdog timer MMIO address
+ * from SBResource_MMIO register.
+ */
/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
pci_read_config_dword(sp5100_tco_pci,
SP5100_SB_RESOURCE_MMIO_BASE,
- &val);
- } else {
+ &mmio_addr);
+ if ((mmio_addr & (SB800_ACPI_MMIO_DECODE_EN |
+ SB800_ACPI_MMIO_SEL)) !=
+ SB800_ACPI_MMIO_DECODE_EN) {
+ ret = -ENODEV;
+ goto unreg_region;
+ }
+ mmio_addr &= ~0xFFF;
+ mmio_addr += SB800_PM_WDT_MMIO_OFFSET;
+ break;
+ case sb800:
/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
- val = sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN);
- }
-
- /* The SBResource_MMIO is enabled and mapped memory space? */
- if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) !=
+ mmio_addr =
+ sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN);
+ if ((mmio_addr & (SB800_ACPI_MMIO_DECODE_EN |
+ SB800_ACPI_MMIO_SEL)) !=
SB800_ACPI_MMIO_DECODE_EN) {
- dev_notice(dev,
- "failed to find MMIO address, giving up.\n");
- ret = -ENODEV;
- goto unreg_region;
+ ret = -ENODEV;
+ goto unreg_region;
+ }
+ mmio_addr &= ~0xFFF;
+ mmio_addr += SB800_PM_WDT_MMIO_OFFSET;
+ break;
+ case efch:
+ val = sp5100_tco_read_pm_reg8(EFCH_PM_ISACONTROL);
+ if (!(val & EFCH_PM_ISACONTROL_MMIOEN)) {
+ ret = -ENODEV;
+ goto unreg_region;
+ }
+ mmio_addr = EFCH_PM_ACPI_MMIO_ADDR +
+ EFCH_PM_ACPI_MMIO_WDT_OFFSET;
+ break;
}
- /* Clear unnecessary the low twelve bits */
- val &= ~0xFFF;
- /* Add the Watchdog Timer offset to base address. */
- val += SB800_PM_WDT_MMIO_OFFSET;
- /* Check MMIO address conflict */
- if (!devm_request_mem_region(dev, val, SP5100_WDT_MEM_MAP_SIZE,
+ dev_dbg(dev, "Got 0x%08x from SBResource_MMIO register\n",
+ mmio_addr);
+ if (!devm_request_mem_region(dev, mmio_addr,
+ SP5100_WDT_MEM_MAP_SIZE,
dev_name)) {
- dev_dbg(dev, "MMIO address 0x%04x already in use\n",
- val);
+ dev_dbg(dev, "MMIO address 0x%08x already in use\n",
+ mmio_addr);
ret = -EBUSY;
goto unreg_region;
}
- dev_dbg(dev, "Got 0x%04x from SBResource_MMIO register\n", val);
}
- tco->tcobase = devm_ioremap(dev, val, SP5100_WDT_MEM_MAP_SIZE);
+ tco->tcobase = devm_ioremap(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE);
if (!tco->tcobase) {
dev_err(dev, "failed to get tcobase address\n");
ret = -ENOMEM;
goto unreg_region;
}
- dev_info(dev, "Using 0x%04x for watchdog MMIO address\n", val);
+ dev_info(dev, "Using 0x%08x for watchdog MMIO address\n", mmio_addr);
/* Setup the watchdog timer */
- tco_timer_enable();
+ tco_timer_enable(tco);
val = readl(SP5100_WDT_CONTROL(tco->tcobase));
if (val & SP5100_WDT_DISABLED) {
@@ -332,6 +385,8 @@ static int sp5100_tco_probe(struct platform_device *pdev)
if (!tco)
return -ENOMEM;
+ tco->tco_reg_layout = tco_reg_layout(sp5100_tco_pci);
+
wdd = &tco->wdd;
wdd->parent = dev;
wdd->info = &sp5100_tco_wdt_info;
diff --git a/drivers/watchdog/sp5100_tco.h b/drivers/watchdog/sp5100_tco.h
index 008b2094bd13..87eaf357ae01 100644
--- a/drivers/watchdog/sp5100_tco.h
+++ b/drivers/watchdog/sp5100_tco.h
@@ -62,3 +62,24 @@
#define SB800_PM_WDT_MMIO_OFFSET 0xB00
#define SB800_DEVNAME "SB800 TCO"
+
+/* For recent chips with embedded FCH (rev 40+) */
+
+#define EFCH_PM_DECODEEN 0x00
+
+#define EFCH_PM_DECODEEN_WDT_TMREN BIT(7)
+
+
+#define EFCH_PM_DECODEEN3 0x00
+#define EFCH_PM_DECODEEN_SECOND_RES GENMASK(1, 0)
+#define EFCH_PM_WATCHDOG_DISABLE ((u8)GENMASK(3, 2))
+
+/* WDT MMIO if enabled with PM00_DECODEEN_WDT_TMREN */
+#define EFCH_PM_WDT_ADDR 0xfeb00000
+
+#define EFCH_PM_ISACONTROL 0x04
+
+#define EFCH_PM_ISACONTROL_MMIOEN BIT(1)
+
+#define EFCH_PM_ACPI_MMIO_ADDR 0xfed80000
+#define EFCH_PM_ACPI_MMIO_WDT_OFFSET 0x00000b00
--
2.7.4