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path: root/drivers/watchdog/sp5100_tco.c
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Diffstat (limited to 'drivers/watchdog/sp5100_tco.c')
-rw-r--r--drivers/watchdog/sp5100_tco.c321
1 files changed, 271 insertions, 50 deletions
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index b3876812ff0..2b0e000d437 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -13,7 +13,9 @@
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
- * See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
+ * See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
+ * AMD Publication 45482 "AMD SB800-Series Southbridges Register
+ * Reference Guide"
*/
/*
@@ -38,18 +40,24 @@
#include "sp5100_tco.h"
/* Module and version information */
-#define TCO_VERSION "0.01"
+#define TCO_VERSION "0.03"
#define TCO_MODULE_NAME "SP5100 TCO timer"
#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
/* internal variables */
static u32 tcobase_phys;
+static u32 resbase_phys;
+static u32 tco_wdt_fired;
static void __iomem *tcobase;
static unsigned int pm_iobase;
static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
static unsigned long timer_alive;
static char tco_expect_close;
static struct pci_dev *sp5100_tco_pci;
+static struct resource wdt_res = {
+ .name = "Watchdog Timer",
+ .flags = IORESOURCE_MEM,
+};
/* the watchdog platform device */
static struct platform_device *sp5100_tco_platform_device;
@@ -64,9 +72,15 @@ MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+static unsigned int force_addr;
+module_param(force_addr, uint, 0);
+MODULE_PARM_DESC(force_addr, "Force the use of specified MMIO address."
+ " ONLY USE THIS PARAMETER IF YOU REALLY KNOW"
+ " WHAT YOU ARE DOING (default=none)");
+
/*
* Some TCO specific functions
*/
@@ -122,6 +136,79 @@ static int tco_timer_set_heartbeat(int t)
return 0;
}
+static void tco_timer_enable(void)
+{
+ int val;
+
+ if (sp5100_tco_pci->revision >= 0x40) {
+ /* For SB800 or later */
+ /* Set the Watchdog timer resolution to 1 sec */
+ outb(SB800_PM_WATCHDOG_CONFIG, SB800_IO_PM_INDEX_REG);
+ val = inb(SB800_IO_PM_DATA_REG);
+ val |= SB800_PM_WATCHDOG_SECOND_RES;
+ outb(val, SB800_IO_PM_DATA_REG);
+
+ /* Enable watchdog decode bit and watchdog timer */
+ outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
+ val = inb(SB800_IO_PM_DATA_REG);
+ val |= SB800_PCI_WATCHDOG_DECODE_EN;
+ val &= ~SB800_PM_WATCHDOG_DISABLE;
+ outb(val, SB800_IO_PM_DATA_REG);
+ } else {
+ /* For SP5100 or SB7x0 */
+ /* Enable watchdog decode bit */
+ pci_read_config_dword(sp5100_tco_pci,
+ SP5100_PCI_WATCHDOG_MISC_REG,
+ &val);
+
+ val |= SP5100_PCI_WATCHDOG_DECODE_EN;
+
+ pci_write_config_dword(sp5100_tco_pci,
+ SP5100_PCI_WATCHDOG_MISC_REG,
+ val);
+
+ /* Enable Watchdog timer and set the resolution to 1 sec */
+ outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
+ val = inb(SP5100_IO_PM_DATA_REG);
+ val |= SP5100_PM_WATCHDOG_SECOND_RES;
+ val &= ~SP5100_PM_WATCHDOG_DISABLE;
+ outb(val, SP5100_IO_PM_DATA_REG);
+ }
+}
+
+static void tco_timer_disable(void)
+{
+ int val;
+
+ if (sp5100_tco_pci->revision >= 0x40) {
+ /* For SB800 or later */
+ /* Enable watchdog decode bit and Disable watchdog timer */
+ outb(SB800_PM_WATCHDOG_CONTROL, SB800_IO_PM_INDEX_REG);
+ val = inb(SB800_IO_PM_DATA_REG);
+ val |= SB800_PCI_WATCHDOG_DECODE_EN;
+ val |= SB800_PM_WATCHDOG_DISABLE;
+ outb(val, SB800_IO_PM_DATA_REG);
+ } else {
+ /* For SP5100 or SB7x0 */
+ /* Enable watchdog decode bit */
+ pci_read_config_dword(sp5100_tco_pci,
+ SP5100_PCI_WATCHDOG_MISC_REG,
+ &val);
+
+ val |= SP5100_PCI_WATCHDOG_DECODE_EN;
+
+ pci_write_config_dword(sp5100_tco_pci,
+ SP5100_PCI_WATCHDOG_MISC_REG,
+ val);
+
+ /* Disable Watchdog timer */
+ outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
+ val = inb(SP5100_IO_PM_DATA_REG);
+ val |= SP5100_PM_WATCHDOG_DISABLE;
+ outb(val, SP5100_IO_PM_DATA_REG);
+ }
+}
+
/*
* /dev/watchdog handling
*/
@@ -270,11 +357,12 @@ MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
/*
* Init & exit routines
*/
-
static unsigned char sp5100_tco_setupdevice(void)
{
struct pci_dev *dev = NULL;
+ const char *dev_name = NULL;
u32 val;
+ u32 index_reg, data_reg, base_addr;
/* Match the PCI device */
for_each_pci_dev(dev) {
@@ -287,29 +375,160 @@ static unsigned char sp5100_tco_setupdevice(void)
if (!sp5100_tco_pci)
return 0;
+ pr_info("PCI Revision ID: 0x%x\n", sp5100_tco_pci->revision);
+
+ /*
+ * Determine type of southbridge chipset.
+ */
+ if (sp5100_tco_pci->revision >= 0x40) {
+ dev_name = SB800_DEVNAME;
+ index_reg = SB800_IO_PM_INDEX_REG;
+ data_reg = SB800_IO_PM_DATA_REG;
+ base_addr = SB800_PM_WATCHDOG_BASE;
+ } else {
+ dev_name = SP5100_DEVNAME;
+ index_reg = SP5100_IO_PM_INDEX_REG;
+ data_reg = SP5100_IO_PM_DATA_REG;
+ base_addr = SP5100_PM_WATCHDOG_BASE;
+ }
+
/* Request the IO ports used by this driver */
pm_iobase = SP5100_IO_PM_INDEX_REG;
- if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
+ if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, dev_name)) {
pr_err("I/O address 0x%04x already in use\n", pm_iobase);
goto exit;
}
- /* Find the watchdog base address. */
- outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
- val = inb(SP5100_IO_PM_DATA_REG);
- outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
- val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
- outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
- val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
- outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
- /* Low three bits of BASE0 are reserved. */
- val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
+ /*
+ * First, Find the watchdog timer MMIO address from indirect I/O.
+ */
+ outb(base_addr+3, index_reg);
+ val = inb(data_reg);
+ outb(base_addr+2, index_reg);
+ val = val << 8 | inb(data_reg);
+ outb(base_addr+1, index_reg);
+ val = val << 8 | inb(data_reg);
+ outb(base_addr+0, index_reg);
+ /* Low three bits of BASE are reserved */
+ val = val << 8 | (inb(data_reg) & 0xf8);
+
+ pr_debug("Got 0x%04x from indirect I/O\n", val);
+
+ /* Check MMIO address conflict */
+ if (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
+ dev_name))
+ goto setup_wdt;
+ else
+ pr_debug("MMIO address 0x%04x already in use\n", val);
+
+ /*
+ * Secondly, Find the watchdog timer MMIO address
+ * from SBResource_MMIO register.
+ */
+ if (sp5100_tco_pci->revision >= 0x40) {
+ /* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
+ outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
+ val = inb(SB800_IO_PM_DATA_REG);
+ outb(SB800_PM_ACPI_MMIO_EN+2, SB800_IO_PM_INDEX_REG);
+ val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+ outb(SB800_PM_ACPI_MMIO_EN+1, SB800_IO_PM_INDEX_REG);
+ val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+ outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
+ val = val << 8 | inb(SB800_IO_PM_DATA_REG);
+ } else {
+ /* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
+ pci_read_config_dword(sp5100_tco_pci,
+ SP5100_SB_RESOURCE_MMIO_BASE, &val);
+ }
+
+ /* The SBResource_MMIO is enabled and mapped memory space? */
+ if ((val & (SB800_ACPI_MMIO_DECODE_EN | SB800_ACPI_MMIO_SEL)) ==
+ SB800_ACPI_MMIO_DECODE_EN) {
+ /* 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 (request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
+ dev_name)) {
+ pr_debug("Got 0x%04x from SBResource_MMIO register\n",
+ val);
+ goto setup_wdt;
+ } else
+ pr_debug("MMIO address 0x%04x already in use\n", val);
+ } else
+ pr_debug("SBResource_MMIO is disabled(0x%04x)\n", val);
+
+ /*
+ * Lastly re-programming the watchdog timer MMIO address,
+ * This method is a last resort...
+ *
+ * Before re-programming, to ensure that the watchdog timer
+ * is disabled, disable the watchdog timer.
+ */
+ tco_timer_disable();
+
+ if (force_addr) {
+ /*
+ * Force the use of watchdog timer MMIO address, and aligned to
+ * 8byte boundary.
+ */
+ force_addr &= ~0x7;
+ val = force_addr;
+
+ pr_info("Force the use of 0x%04x as MMIO address\n", val);
+ } else {
+ /*
+ * Get empty slot into the resource tree for watchdog timer.
+ */
+ if (allocate_resource(&iomem_resource,
+ &wdt_res,
+ SP5100_WDT_MEM_MAP_SIZE,
+ 0xf0000000,
+ 0xfffffff8,
+ 0x8,
+ NULL,
+ NULL)) {
+ pr_err("MMIO allocation failed\n");
+ goto unreg_region;
+ }
+
+ val = resbase_phys = wdt_res.start;
+ pr_debug("Got 0x%04x from resource tree\n", val);
+ }
+
+ /* Restore to the low three bits, if chipset is SB8x0(or later) */
+ if (sp5100_tco_pci->revision >= 0x40) {
+ u8 reserved_bit;
+ reserved_bit = inb(base_addr) & 0x7;
+ val |= (u32)reserved_bit;
+ }
+
+ /* Re-programming the watchdog timer base address */
+ outb(base_addr+0, index_reg);
+ /* Low three bits of BASE are reserved */
+ outb((val >> 0) & 0xf8, data_reg);
+ outb(base_addr+1, index_reg);
+ outb((val >> 8) & 0xff, data_reg);
+ outb(base_addr+2, index_reg);
+ outb((val >> 16) & 0xff, data_reg);
+ outb(base_addr+3, index_reg);
+ outb((val >> 24) & 0xff, data_reg);
+
+ /*
+ * Clear unnecessary the low three bits,
+ * if chipset is SB8x0(or later)
+ */
+ if (sp5100_tco_pci->revision >= 0x40)
+ val &= ~0x7;
if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
- "SP5100 TCO")) {
- pr_err("mmio address 0x%04x already in use\n", val);
- goto unreg_region;
+ dev_name)) {
+ pr_err("MMIO address 0x%04x already in use\n", val);
+ goto unreg_resource;
}
+
+setup_wdt:
tcobase_phys = val;
tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
@@ -318,26 +537,18 @@ static unsigned char sp5100_tco_setupdevice(void)
goto unreg_mem_region;
}
- /* Enable watchdog decode bit */
- pci_read_config_dword(sp5100_tco_pci,
- SP5100_PCI_WATCHDOG_MISC_REG,
- &val);
-
- val |= SP5100_PCI_WATCHDOG_DECODE_EN;
+ pr_info("Using 0x%04x for watchdog MMIO address\n", val);
- pci_write_config_dword(sp5100_tco_pci,
- SP5100_PCI_WATCHDOG_MISC_REG,
- val);
+ /* Setup the watchdog timer */
+ tco_timer_enable();
- /* Enable Watchdog timer and set the resolution to 1 sec. */
- outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
- val = inb(SP5100_IO_PM_DATA_REG);
- val |= SP5100_PM_WATCHDOG_SECOND_RES;
- val &= ~SP5100_PM_WATCHDOG_DISABLE;
- outb(val, SP5100_IO_PM_DATA_REG);
-
- /* Check that the watchdog action is set to reset the system. */
+ /* Check that the watchdog action is set to reset the system */
val = readl(SP5100_WDT_CONTROL(tcobase));
+ /*
+ * Save WatchDogFired status, because WatchDogFired flag is
+ * cleared here.
+ */
+ tco_wdt_fired = val & SP5100_PM_WATCHDOG_FIRED;
val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
writel(val, SP5100_WDT_CONTROL(tcobase));
@@ -355,6 +566,9 @@ static unsigned char sp5100_tco_setupdevice(void)
unreg_mem_region:
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+unreg_resource:
+ if (resbase_phys)
+ release_resource(&wdt_res);
unreg_region:
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
exit:
@@ -364,23 +578,18 @@ exit:
static int sp5100_tco_init(struct platform_device *dev)
{
int ret;
- u32 val;
+ char addr_str[16];
- /* Check whether or not the hardware watchdog is there. If found, then
+ /*
+ * Check whether or not the hardware watchdog is there. If found, then
* set it up.
*/
if (!sp5100_tco_setupdevice())
return -ENODEV;
/* Check to see if last reboot was due to watchdog timeout */
- pr_info("Watchdog reboot %sdetected\n",
- readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
- "" : "not ");
-
- /* Clear out the old status */
- val = readl(SP5100_WDT_CONTROL(tcobase));
- val &= ~SP5100_PM_WATCHDOG_FIRED;
- writel(val, SP5100_WDT_CONTROL(tcobase));
+ pr_info("Last reboot was %striggered by watchdog.\n",
+ tco_wdt_fired ? "" : "not ");
/*
* Check that the heartbeat value is within it's range.
@@ -400,14 +609,24 @@ static int sp5100_tco_init(struct platform_device *dev)
clear_bit(0, &timer_alive);
- pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n",
- tcobase, heartbeat, nowayout);
+ /* Show module parameters */
+ if (force_addr == tcobase_phys)
+ /* The force_addr is vaild */
+ sprintf(addr_str, "0x%04x", force_addr);
+ else
+ strcpy(addr_str, "none");
+
+ pr_info("initialized (0x%p). heartbeat=%d sec (nowayout=%d, "
+ "force_addr=%s)\n",
+ tcobase, heartbeat, nowayout, addr_str);
return 0;
exit:
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+ if (resbase_phys)
+ release_resource(&wdt_res);
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
return ret;
}
@@ -422,6 +641,8 @@ static void sp5100_tco_cleanup(void)
misc_deregister(&sp5100_tco_miscdev);
iounmap(tcobase);
release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
+ if (resbase_phys)
+ release_resource(&wdt_res);
release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
}
@@ -451,7 +672,7 @@ static int __init sp5100_tco_init_module(void)
{
int err;
- pr_info("SP5100 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
+ pr_info("SP5100/SB800 TCO WatchDog Timer Driver v%s\n", TCO_VERSION);
err = platform_driver_register(&sp5100_tco_driver);
if (err)
@@ -475,13 +696,13 @@ static void __exit sp5100_tco_cleanup_module(void)
{
platform_device_unregister(sp5100_tco_platform_device);
platform_driver_unregister(&sp5100_tco_driver);
- pr_info("SP5100 TCO Watchdog Module Unloaded\n");
+ pr_info("SP5100/SB800 TCO Watchdog Module Unloaded\n");
}
module_init(sp5100_tco_init_module);
module_exit(sp5100_tco_cleanup_module);
MODULE_AUTHOR("Priyanka Gupta");
-MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
+MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 14:57:03 +0000