1 files changed, 271 insertions, 50 deletions

diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index b3876812ff07..2b0e000d4377 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);