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path: root/drivers/watchdog/iTCO_wdt.c
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Diffstat (limited to 'drivers/watchdog/iTCO_wdt.c')
-rw-r--r--drivers/watchdog/iTCO_wdt.c660
1 files changed, 660 insertions, 0 deletions
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
new file mode 100644
index 000000000..3c3fd417d
--- /dev/null
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -0,0 +1,660 @@
+/*
+ * intel TCO Watchdog Driver
+ *
+ * (c) Copyright 2006-2011 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ * provide warranty for any of this software. This material is
+ * provided "AS-IS" and at no charge.
+ *
+ * The TCO watchdog is implemented in the following I/O controller hubs:
+ * (See the intel documentation on http://developer.intel.com.)
+ * document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO)
+ * document number 290687-002, 298242-027: 82801BA (ICH2)
+ * document number 290733-003, 290739-013: 82801CA (ICH3-S)
+ * document number 290716-001, 290718-007: 82801CAM (ICH3-M)
+ * document number 290744-001, 290745-025: 82801DB (ICH4)
+ * document number 252337-001, 252663-008: 82801DBM (ICH4-M)
+ * document number 273599-001, 273645-002: 82801E (C-ICH)
+ * document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R)
+ * document number 300641-004, 300884-013: 6300ESB
+ * document number 301473-002, 301474-026: 82801F (ICH6)
+ * document number 313082-001, 313075-006: 631xESB, 632xESB
+ * document number 307013-003, 307014-024: 82801G (ICH7)
+ * document number 322896-001, 322897-001: NM10
+ * document number 313056-003, 313057-017: 82801H (ICH8)
+ * document number 316972-004, 316973-012: 82801I (ICH9)
+ * document number 319973-002, 319974-002: 82801J (ICH10)
+ * document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH)
+ * document number 320066-003, 320257-008: EP80597 (IICH)
+ * document number 324645-001, 324646-001: Cougar Point (CPT)
+ * document number TBD : Patsburg (PBG)
+ * document number TBD : DH89xxCC
+ * document number TBD : Panther Point
+ * document number TBD : Lynx Point
+ * document number TBD : Lynx Point-LP
+ */
+
+/*
+ * Includes, defines, variables, module parameters, ...
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+/* Module and version information */
+#define DRV_NAME "iTCO_wdt"
+#define DRV_VERSION "1.11"
+
+/* Includes */
+#include <linux/acpi.h> /* For ACPI support */
+#include <linux/module.h> /* For module specific items */
+#include <linux/moduleparam.h> /* For new moduleparam's */
+#include <linux/types.h> /* For standard types (like size_t) */
+#include <linux/errno.h> /* For the -ENODEV/... values */
+#include <linux/kernel.h> /* For printk/panic/... */
+#include <linux/watchdog.h> /* For the watchdog specific items */
+#include <linux/init.h> /* For __init/__exit/... */
+#include <linux/fs.h> /* For file operations */
+#include <linux/platform_device.h> /* For platform_driver framework */
+#include <linux/pci.h> /* For pci functions */
+#include <linux/ioport.h> /* For io-port access */
+#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 "iTCO_vendor.h"
+
+/* Address definitions for the TCO */
+/* TCO base address */
+#define TCOBASE (iTCO_wdt_private.tco_res->start)
+/* SMI Control and Enable Register */
+#define SMI_EN (iTCO_wdt_private.smi_res->start)
+
+#define TCO_RLD (TCOBASE + 0x00) /* TCO Timer Reload and Curr. Value */
+#define TCOv1_TMR (TCOBASE + 0x01) /* TCOv1 Timer Initial Value */
+#define TCO_DAT_IN (TCOBASE + 0x02) /* TCO Data In Register */
+#define TCO_DAT_OUT (TCOBASE + 0x03) /* TCO Data Out Register */
+#define TCO1_STS (TCOBASE + 0x04) /* TCO1 Status Register */
+#define TCO2_STS (TCOBASE + 0x06) /* TCO2 Status Register */
+#define TCO1_CNT (TCOBASE + 0x08) /* TCO1 Control Register */
+#define TCO2_CNT (TCOBASE + 0x0a) /* TCO2 Control Register */
+#define TCOv2_TMR (TCOBASE + 0x12) /* TCOv2 Timer Initial Value */
+
+/* internal variables */
+static struct { /* this is private data for the iTCO_wdt device */
+ /* TCO version/generation */
+ unsigned int iTCO_version;
+ struct resource *tco_res;
+ struct resource *smi_res;
+ /*
+ * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2),
+ * or memory-mapped PMC register bit 4 (TCO version 3).
+ */
+ struct resource *gcs_pmc_res;
+ unsigned long __iomem *gcs_pmc;
+ /* the lock for io operations */
+ spinlock_t io_lock;
+ struct platform_device *dev;
+ /* the PCI-device */
+ struct pci_dev *pdev;
+ /* whether or not the watchdog has been suspended */
+ bool suspended;
+} iTCO_wdt_private;
+
+/* module parameters */
+#define WATCHDOG_TIMEOUT 30 /* 30 sec default heartbeat */
+static int heartbeat = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. "
+ "5..76 (TCO v1) or 3..614 (TCO v2), default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int turn_SMI_watchdog_clear_off = 1;
+module_param(turn_SMI_watchdog_clear_off, int, 0);
+MODULE_PARM_DESC(turn_SMI_watchdog_clear_off,
+ "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)");
+
+/*
+ * Some TCO specific functions
+ */
+
+/*
+ * The iTCO v1 and v2's internal timer is stored as ticks which decrement
+ * every 0.6 seconds. v3's internal timer is stored as seconds (some
+ * datasheets incorrectly state 0.6 seconds).
+ */
+static inline unsigned int seconds_to_ticks(int secs)
+{
+ return iTCO_wdt_private.iTCO_version == 3 ? secs : (secs * 10) / 6;
+}
+
+static inline unsigned int ticks_to_seconds(int ticks)
+{
+ return iTCO_wdt_private.iTCO_version == 3 ? ticks : (ticks * 6) / 10;
+}
+
+static void iTCO_wdt_set_NO_REBOOT_bit(void)
+{
+ u32 val32;
+
+ /* Set the NO_REBOOT bit: this disables reboots */
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 |= 0x00000010;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+ } else if (iTCO_wdt_private.iTCO_version == 2) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 |= 0x00000020;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
+ pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
+ val32 |= 0x00000002;
+ pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
+ }
+}
+
+static int iTCO_wdt_unset_NO_REBOOT_bit(void)
+{
+ int ret = 0;
+ u32 val32;
+
+ /* Unset the NO_REBOOT bit: this enables reboots */
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 &= 0xffffffef;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ if (val32 & 0x00000010)
+ ret = -EIO;
+ } else if (iTCO_wdt_private.iTCO_version == 2) {
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ val32 &= 0xffffffdf;
+ writel(val32, iTCO_wdt_private.gcs_pmc);
+
+ val32 = readl(iTCO_wdt_private.gcs_pmc);
+ if (val32 & 0x00000020)
+ ret = -EIO;
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
+ pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
+ val32 &= 0xfffffffd;
+ pci_write_config_dword(iTCO_wdt_private.pdev, 0xd4, val32);
+
+ pci_read_config_dword(iTCO_wdt_private.pdev, 0xd4, &val32);
+ if (val32 & 0x00000002)
+ ret = -EIO;
+ }
+
+ return ret; /* returns: 0 = OK, -EIO = Error */
+}
+
+static int iTCO_wdt_start(struct watchdog_device *wd_dev)
+{
+ unsigned int val;
+
+ spin_lock(&iTCO_wdt_private.io_lock);
+
+ iTCO_vendor_pre_start(iTCO_wdt_private.smi_res, wd_dev->timeout);
+
+ /* disable chipset's NO_REBOOT bit */
+ if (iTCO_wdt_unset_NO_REBOOT_bit()) {
+ spin_unlock(&iTCO_wdt_private.io_lock);
+ pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n");
+ return -EIO;
+ }
+
+ /* Force the timer to its reload value by writing to the TCO_RLD
+ register */
+ if (iTCO_wdt_private.iTCO_version >= 2)
+ outw(0x01, TCO_RLD);
+ else if (iTCO_wdt_private.iTCO_version == 1)
+ outb(0x01, TCO_RLD);
+
+ /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
+ val = inw(TCO1_CNT);
+ val &= 0xf7ff;
+ outw(val, TCO1_CNT);
+ val = inw(TCO1_CNT);
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ if (val & 0x0800)
+ return -1;
+ return 0;
+}
+
+static int iTCO_wdt_stop(struct watchdog_device *wd_dev)
+{
+ unsigned int val;
+
+ spin_lock(&iTCO_wdt_private.io_lock);
+
+ iTCO_vendor_pre_stop(iTCO_wdt_private.smi_res);
+
+ /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
+ val = inw(TCO1_CNT);
+ val |= 0x0800;
+ outw(val, TCO1_CNT);
+ val = inw(TCO1_CNT);
+
+ /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
+ iTCO_wdt_set_NO_REBOOT_bit();
+
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ if ((val & 0x0800) == 0)
+ return -1;
+ return 0;
+}
+
+static int iTCO_wdt_ping(struct watchdog_device *wd_dev)
+{
+ spin_lock(&iTCO_wdt_private.io_lock);
+
+ iTCO_vendor_pre_keepalive(iTCO_wdt_private.smi_res, wd_dev->timeout);
+
+ /* Reload the timer by writing to the TCO Timer Counter register */
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ outw(0x01, TCO_RLD);
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
+ /* Reset the timeout status bit so that the timer
+ * needs to count down twice again before rebooting */
+ outw(0x0008, TCO1_STS); /* write 1 to clear bit */
+
+ outb(0x01, TCO_RLD);
+ }
+
+ spin_unlock(&iTCO_wdt_private.io_lock);
+ return 0;
+}
+
+static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
+{
+ unsigned int val16;
+ unsigned char val8;
+ unsigned int tmrval;
+
+ tmrval = seconds_to_ticks(t);
+
+ /* For TCO v1 the timer counts down twice before rebooting */
+ if (iTCO_wdt_private.iTCO_version == 1)
+ tmrval /= 2;
+
+ /* from the specs: */
+ /* "Values of 0h-3h are ignored and should not be attempted" */
+ if (tmrval < 0x04)
+ return -EINVAL;
+ if (((iTCO_wdt_private.iTCO_version >= 2) && (tmrval > 0x3ff)) ||
+ ((iTCO_wdt_private.iTCO_version == 1) && (tmrval > 0x03f)))
+ return -EINVAL;
+
+ iTCO_vendor_pre_set_heartbeat(tmrval);
+
+ /* Write new heartbeat to watchdog */
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ spin_lock(&iTCO_wdt_private.io_lock);
+ val16 = inw(TCOv2_TMR);
+ val16 &= 0xfc00;
+ val16 |= tmrval;
+ outw(val16, TCOv2_TMR);
+ val16 = inw(TCOv2_TMR);
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ if ((val16 & 0x3ff) != tmrval)
+ return -EINVAL;
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
+ spin_lock(&iTCO_wdt_private.io_lock);
+ val8 = inb(TCOv1_TMR);
+ val8 &= 0xc0;
+ val8 |= (tmrval & 0xff);
+ outb(val8, TCOv1_TMR);
+ val8 = inb(TCOv1_TMR);
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ if ((val8 & 0x3f) != tmrval)
+ return -EINVAL;
+ }
+
+ wd_dev->timeout = t;
+ return 0;
+}
+
+static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
+{
+ unsigned int val16;
+ unsigned char val8;
+ unsigned int time_left = 0;
+
+ /* read the TCO Timer */
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ spin_lock(&iTCO_wdt_private.io_lock);
+ val16 = inw(TCO_RLD);
+ val16 &= 0x3ff;
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ time_left = ticks_to_seconds(val16);
+ } else if (iTCO_wdt_private.iTCO_version == 1) {
+ spin_lock(&iTCO_wdt_private.io_lock);
+ val8 = inb(TCO_RLD);
+ val8 &= 0x3f;
+ if (!(inw(TCO1_STS) & 0x0008))
+ val8 += (inb(TCOv1_TMR) & 0x3f);
+ spin_unlock(&iTCO_wdt_private.io_lock);
+
+ time_left = ticks_to_seconds(val8);
+ }
+ return time_left;
+}
+
+/*
+ * Kernel Interfaces
+ */
+
+static const struct watchdog_info ident = {
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 0,
+ .identity = DRV_NAME,
+};
+
+static const struct watchdog_ops iTCO_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = iTCO_wdt_start,
+ .stop = iTCO_wdt_stop,
+ .ping = iTCO_wdt_ping,
+ .set_timeout = iTCO_wdt_set_timeout,
+ .get_timeleft = iTCO_wdt_get_timeleft,
+};
+
+static struct watchdog_device iTCO_wdt_watchdog_dev = {
+ .info = &ident,
+ .ops = &iTCO_wdt_ops,
+};
+
+/*
+ * Init & exit routines
+ */
+
+static void iTCO_wdt_cleanup(void)
+{
+ /* Stop the timer before we leave */
+ if (!nowayout)
+ iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
+
+ /* Deregister */
+ watchdog_unregister_device(&iTCO_wdt_watchdog_dev);
+
+ /* release resources */
+ release_region(iTCO_wdt_private.tco_res->start,
+ resource_size(iTCO_wdt_private.tco_res));
+ release_region(iTCO_wdt_private.smi_res->start,
+ resource_size(iTCO_wdt_private.smi_res));
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ iounmap(iTCO_wdt_private.gcs_pmc);
+ release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
+ }
+
+ iTCO_wdt_private.tco_res = NULL;
+ iTCO_wdt_private.smi_res = NULL;
+ iTCO_wdt_private.gcs_pmc_res = NULL;
+ iTCO_wdt_private.gcs_pmc = NULL;
+}
+
+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);
+
+ if (!ich_info)
+ goto out;
+
+ spin_lock_init(&iTCO_wdt_private.io_lock);
+
+ iTCO_wdt_private.tco_res =
+ platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_TCO);
+ if (!iTCO_wdt_private.tco_res)
+ goto out;
+
+ iTCO_wdt_private.smi_res =
+ platform_get_resource(dev, IORESOURCE_IO, ICH_RES_IO_SMI);
+ if (!iTCO_wdt_private.smi_res)
+ goto out;
+
+ iTCO_wdt_private.iTCO_version = ich_info->iTCO_version;
+ iTCO_wdt_private.dev = dev;
+ iTCO_wdt_private.pdev = to_pci_dev(dev->dev.parent);
+
+ /*
+ * Get the Memory-Mapped GCS or PMC register, we need it for the
+ * NO_REBOOT flag (TCO v2 and v3).
+ */
+ if (iTCO_wdt_private.iTCO_version >= 2) {
+ iTCO_wdt_private.gcs_pmc_res = platform_get_resource(dev,
+ IORESOURCE_MEM,
+ ICH_RES_MEM_GCS_PMC);
+
+ if (!iTCO_wdt_private.gcs_pmc_res)
+ goto out;
+
+ if (!request_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res), dev->name)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ iTCO_wdt_private.gcs_pmc = ioremap(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
+ if (!iTCO_wdt_private.gcs_pmc) {
+ ret = -EIO;
+ goto unreg_gcs_pmc;
+ }
+ }
+
+ /* Check chipset's NO_REBOOT bit */
+ if (iTCO_wdt_unset_NO_REBOOT_bit() && iTCO_vendor_check_noreboot_on()) {
+ pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n");
+ ret = -ENODEV; /* Cannot reset NO_REBOOT bit */
+ goto unmap_gcs_pmc;
+ }
+
+ /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
+ iTCO_wdt_set_NO_REBOOT_bit();
+
+ /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
+ if (!request_region(iTCO_wdt_private.smi_res->start,
+ resource_size(iTCO_wdt_private.smi_res), dev->name)) {
+ pr_err("I/O address 0x%04llx already in use, device disabled\n",
+ (u64)SMI_EN);
+ ret = -EBUSY;
+ goto unmap_gcs_pmc;
+ }
+ if (turn_SMI_watchdog_clear_off >= iTCO_wdt_private.iTCO_version) {
+ /*
+ * Bit 13: TCO_EN -> 0
+ * Disables TCO logic generating an SMI#
+ */
+ val32 = inl(SMI_EN);
+ val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
+ outl(val32, SMI_EN);
+ }
+
+ if (!request_region(iTCO_wdt_private.tco_res->start,
+ resource_size(iTCO_wdt_private.tco_res), dev->name)) {
+ pr_err("I/O address 0x%04llx already in use, device disabled\n",
+ (u64)TCOBASE);
+ ret = -EBUSY;
+ goto unreg_smi;
+ }
+
+ pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n",
+ ich_info->name, ich_info->iTCO_version, (u64)TCOBASE);
+
+ /* Clear out the (probably old) status */
+ if (iTCO_wdt_private.iTCO_version == 3) {
+ outl(0x20008, TCO1_STS);
+ } else {
+ outw(0x0008, TCO1_STS); /* Clear the Time Out Status bit */
+ outw(0x0002, TCO2_STS); /* Clear SECOND_TO_STS bit */
+ outw(0x0004, TCO2_STS); /* Clear BOOT_STS bit */
+ }
+
+ iTCO_wdt_watchdog_dev.bootstatus = 0;
+ iTCO_wdt_watchdog_dev.timeout = WATCHDOG_TIMEOUT;
+ watchdog_set_nowayout(&iTCO_wdt_watchdog_dev, nowayout);
+ iTCO_wdt_watchdog_dev.parent = &dev->dev;
+
+ /* Make sure the watchdog is not running */
+ iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
+
+ /* Check that the heartbeat value is within it's range;
+ if not reset to the default */
+ if (iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, heartbeat)) {
+ iTCO_wdt_set_timeout(&iTCO_wdt_watchdog_dev, WATCHDOG_TIMEOUT);
+ pr_info("timeout value out of range, using %d\n",
+ WATCHDOG_TIMEOUT);
+ }
+
+ ret = watchdog_register_device(&iTCO_wdt_watchdog_dev);
+ if (ret != 0) {
+ pr_err("cannot register watchdog device (err=%d)\n", ret);
+ goto unreg_tco;
+ }
+
+ pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
+ heartbeat, nowayout);
+
+ return 0;
+
+unreg_tco:
+ release_region(iTCO_wdt_private.tco_res->start,
+ resource_size(iTCO_wdt_private.tco_res));
+unreg_smi:
+ release_region(iTCO_wdt_private.smi_res->start,
+ resource_size(iTCO_wdt_private.smi_res));
+unmap_gcs_pmc:
+ if (iTCO_wdt_private.iTCO_version >= 2)
+ iounmap(iTCO_wdt_private.gcs_pmc);
+unreg_gcs_pmc:
+ if (iTCO_wdt_private.iTCO_version >= 2)
+ release_mem_region(iTCO_wdt_private.gcs_pmc_res->start,
+ resource_size(iTCO_wdt_private.gcs_pmc_res));
+out:
+ iTCO_wdt_private.tco_res = NULL;
+ iTCO_wdt_private.smi_res = NULL;
+ iTCO_wdt_private.gcs_pmc_res = NULL;
+ iTCO_wdt_private.gcs_pmc = NULL;
+
+ return ret;
+}
+
+static int iTCO_wdt_remove(struct platform_device *dev)
+{
+ if (iTCO_wdt_private.tco_res || iTCO_wdt_private.smi_res)
+ iTCO_wdt_cleanup();
+
+ return 0;
+}
+
+static void iTCO_wdt_shutdown(struct platform_device *dev)
+{
+ iTCO_wdt_stop(NULL);
+}
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so
+ * the watchdog cannot be pinged while in that state. In ACPI sleep states the
+ * watchdog is stopped by the platform firmware.
+ */
+
+#ifdef CONFIG_ACPI
+static inline bool need_suspend(void)
+{
+ return acpi_target_system_state() == ACPI_STATE_S0;
+}
+#else
+static inline bool need_suspend(void) { return true; }
+#endif
+
+static int iTCO_wdt_suspend_noirq(struct device *dev)
+{
+ int ret = 0;
+
+ iTCO_wdt_private.suspended = false;
+ if (watchdog_active(&iTCO_wdt_watchdog_dev) && need_suspend()) {
+ ret = iTCO_wdt_stop(&iTCO_wdt_watchdog_dev);
+ if (!ret)
+ iTCO_wdt_private.suspended = true;
+ }
+ return ret;
+}
+
+static int iTCO_wdt_resume_noirq(struct device *dev)
+{
+ if (iTCO_wdt_private.suspended)
+ iTCO_wdt_start(&iTCO_wdt_watchdog_dev);
+
+ return 0;
+}
+
+static struct dev_pm_ops iTCO_wdt_pm = {
+ .suspend_noirq = iTCO_wdt_suspend_noirq,
+ .resume_noirq = iTCO_wdt_resume_noirq,
+};
+
+#define ITCO_WDT_PM_OPS (&iTCO_wdt_pm)
+#else
+#define ITCO_WDT_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
+static struct platform_driver iTCO_wdt_driver = {
+ .probe = iTCO_wdt_probe,
+ .remove = iTCO_wdt_remove,
+ .shutdown = iTCO_wdt_shutdown,
+ .driver = {
+ .name = DRV_NAME,
+ .pm = ITCO_WDT_PM_OPS,
+ },
+};
+
+static int __init iTCO_wdt_init_module(void)
+{
+ int err;
+
+ pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION);
+
+ err = platform_driver_register(&iTCO_wdt_driver);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void __exit iTCO_wdt_cleanup_module(void)
+{
+ platform_driver_unregister(&iTCO_wdt_driver);
+ pr_info("Watchdog Module Unloaded\n");
+}
+
+module_init(iTCO_wdt_init_module);
+module_exit(iTCO_wdt_cleanup_module);
+
+MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
+MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver");
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);