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-/*****************************************************************************
-*
-* Copyright (c) 2014, Advanced Micro Devices, Inc.
-* All rights reserved.
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions are met:
-* * Redistributions of source code must retain the above copyright
-* notice, this list of conditions and the following disclaimer.
-* * Redistributions in binary form must reproduce the above copyright
-* notice, this list of conditions and the following disclaimer in the
-* documentation and/or other materials provided with the distribution.
-* * Neither the name of Advanced Micro Devices, Inc. nor the names of
-* its contributors may be used to endorse or promote products derived
-* from this software without specific prior written permission.
-*
-* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-* DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES, INC. BE LIABLE FOR ANY
-* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*
-*
-***************************************************************************/
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/pci.h>
-#include <linux/ioport.h>
-#include <linux/platform_device.h>
-#include <linux/uaccess.h>
-#include <linux/io.h>
-
-#include "amd_wdt.h"
-
-/* internal variables */
-static u32 wdtbase_phys;
-static void __iomem *wdtbase;
-static DEFINE_SPINLOCK(wdt_lock);
-static unsigned int bootstatus;
-static unsigned long status;
-static struct pci_dev *amd_wdt_pci;
-
-/* watchdog platform device */
-static struct platform_device *amd_wdt_platform_device;
-
-/* module parameters */
-static int heartbeat = WATCHDOG_HEARTBEAT;
-module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in frequency units. "
- "(default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
-
-static char frequency[MAX_LENGTH] = "1s";
-module_param_string(frequency, frequency, MAX_LENGTH, 0);
-MODULE_PARM_DESC(frequency, "Watchdog timer frequency units (32us, "
- "10ms, 100ms, 1s). (default=1s)");
-
-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 char action[MAX_LENGTH] = "reboot";
-module_param_string(action, action, MAX_LENGTH, 0);
-MODULE_PARM_DESC(action, "Watchdog action (reboot/shutdown). (default=reboot) ");
-
-/*
- * Watchdog specific functions
- */
-static int amd_wdt_timer_set_heartbeat(unsigned int t)
-{
- unsigned long flags;
-
- /*
- * In case the user inputs out of range timeout, we set it to the
- * maximum timeout possible.
- */
- if ((t == 0) || (t > 0xffff))
- heartbeat = t = 0xffff;
-
- /* Write new timeout value to watchdog */
- spin_lock_irqsave(&wdt_lock, flags);
- writel(t, AMD_WDT_COUNT(wdtbase));
- spin_unlock_irqrestore(&wdt_lock, flags);
-
- heartbeat = t;
-
- return 0;
-}
-
-static void amd_wdt_timer_activate(void)
-{
- u32 val;
- unsigned long flags;
-
- /* Enable the watchdog timer */
- spin_lock_irqsave(&wdt_lock, flags);
-
- val = readl(AMD_WDT_CONTROL(wdtbase));
- val |= AMD_WDT_START_STOP_BIT;
- writel(val, AMD_WDT_CONTROL(wdtbase));
-
- set_bit(AMD_WDOG_ACTIVE, &status);
-
- spin_unlock_irqrestore(&wdt_lock, flags);
-}
-
-static void amd_wdt_timer_deactivate(void)
-{
- u32 val;
- unsigned long flags;
-
- /* Disable the watchdog timer */
- spin_lock_irqsave(&wdt_lock, flags);
-
- val = readl(AMD_WDT_CONTROL(wdtbase));
- val &= ~AMD_WDT_START_STOP_BIT;
- writel(val, AMD_WDT_CONTROL(wdtbase));
-
- clear_bit(AMD_WDOG_ACTIVE, &status);
-
- spin_unlock_irqrestore(&wdt_lock, flags);
-}
-
-static void amd_wdt_timer_keepalive(void)
-{
- u32 val;
- unsigned long flags;
-
- /* Trigger watchdog */
- spin_lock_irqsave(&wdt_lock, flags);
-
- val = readl(AMD_WDT_CONTROL(wdtbase));
- val |= AMD_WDT_TRIGGER_BIT;
- writel(val, AMD_WDT_CONTROL(wdtbase));
-
- spin_unlock_irqrestore(&wdt_lock, flags);
-}
-
-static unsigned int amd_wdt_timer_get_timeleft(void)
-{
- u32 val;
- unsigned long flags;
-
- spin_lock_irqsave(&wdt_lock, flags);
- val = readl(AMD_WDT_COUNT(wdtbase));
- spin_unlock_irqrestore(&wdt_lock, flags);
-
- /* Mask out the upper 16-bits and return */
- return val & AMD_WDT_COUNT_MASK;
-}
-
-static int amd_wdt_timer_open(struct inode *inode, struct file *file)
-{
- /* /dev/watchdog can only be opened once */
- if (test_and_set_bit(AMD_WDOG_DEV_OPEN, &status))
- return -EBUSY;
-
- /* Start the watchdog timer and ping it once */
- amd_wdt_timer_activate();
- amd_wdt_timer_keepalive();
-
- return nonseekable_open(inode, file);
-}
-
-static int amd_wdt_timer_release(struct inode *inode, struct file *file)
-{
- if (test_and_clear_bit(AMD_WDOG_ALLOW_RELEASE, &status)) {
- amd_wdt_timer_deactivate();
- } else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- amd_wdt_timer_keepalive();
- }
-
- clear_bit(AMD_WDOG_DEV_OPEN, &status);
-
- return 0;
-}
-
-static ssize_t amd_wdt_timer_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
-{
- /* See if we got the magic character 'V' and reload the timer */
- if (len) {
- if (!nowayout) {
- size_t i;
-
- clear_bit(AMD_WDOG_ALLOW_RELEASE, &status);
-
- /*
- * parse user buffer to see if we received magic
- * character 'V'.
- */
- for (i = 0; i != len; i++) {
- char c;
-
- if (get_user(c, data + i))
- return -EFAULT;
-
- if (c == 'V')
- set_bit(AMD_WDOG_ALLOW_RELEASE, &status);
- }
- }
-
- /* Reload the timer */
- amd_wdt_timer_keepalive();
- }
-
- return len;
-}
-
-static long amd_wdt_timer_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int new_options, retval = -EINVAL;
- int new_heartbeat;
- int timeleft;
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static const struct watchdog_info ident = {
- .options = WDIOF_SETTIMEOUT |
- WDIOF_KEEPALIVEPING |
- WDIOF_MAGICCLOSE,
- .firmware_version = 0,
- .identity = WDT_MODULE_NAME,
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident,
- sizeof(ident)) ? -EFAULT : 0;
- case WDIOC_GETSTATUS:
- return put_user(status, p);
- case WDIOC_GETBOOTSTATUS:
- return put_user(bootstatus, p);
- case WDIOC_SETOPTIONS:
- if (get_user(new_options, p))
- return -EFAULT;
- if (new_options & WDIOS_DISABLECARD) {
- amd_wdt_timer_deactivate();
- retval = 0;
- }
- if (new_options & WDIOS_ENABLECARD) {
- amd_wdt_timer_activate();
- amd_wdt_timer_keepalive();
- retval = 0;
- }
- return retval;
- case WDIOC_KEEPALIVE:
- amd_wdt_timer_keepalive();
- return 0;
- case WDIOC_SETTIMEOUT:
- if (get_user(new_heartbeat, p))
- return -EFAULT;
- if (amd_wdt_timer_set_heartbeat(new_heartbeat))
- return -EINVAL;
- amd_wdt_timer_keepalive();
- /* Fall through */
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
- case WDIOC_GETTIMELEFT:
- timeleft = amd_wdt_timer_get_timeleft();
- return put_user(timeleft, p);
- default:
- return -ENOTTY;
- }
-}
-
-/* Watchdog timer file operations structure */
-static const struct file_operations amd_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = amd_wdt_timer_write,
- .unlocked_ioctl = amd_wdt_timer_ioctl,
- .open = amd_wdt_timer_open,
- .release = amd_wdt_timer_release,
-};
-
-static struct miscdevice amd_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &amd_wdt_fops,
-};
-
-/*
- * The PCI Device ID table below is used to identify the platform
- * the driver is supposed to work for. Since this is a platform
- * device, we need a way for us to be able to find the correct
- * platform when the driver gets loaded, otherwise we should
- * bail out.
- */
-static DEFINE_PCI_DEVICE_TABLE(amd_wdt_pci_tbl) = {
- { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
- PCI_ANY_ID, },
- { 0, },
-};
-MODULE_DEVICE_TABLE(pci, amd_wdt_pci_tbl);
-
-static unsigned char amd_wdt_setupdevice(void)
-{
- struct pci_dev *dev = NULL;
- u32 val;
-
- /* Match the PCI device */
- for_each_pci_dev(dev) {
- if (pci_match_id(amd_wdt_pci_tbl, dev) != NULL) {
- amd_wdt_pci = dev;
- break;
- }
- }
-
- if (!amd_wdt_pci)
- return 0;
-
- /* Watchdog Base Address starts from ACPI MMIO Base Address + 0xB00 */
- wdtbase_phys = AMD_ACPI_MMIO_BASE + AMD_WDT_MEM_MAP_OFFSET;
- if (!request_mem_region_exclusive(wdtbase_phys, AMD_WDT_MEM_MAP_SIZE,
- "AMD Watchdog")) {
- pr_err("mmio address 0x%04x already in use\n", wdtbase_phys);
- goto exit;
- }
-
- wdtbase = ioremap(wdtbase_phys, AMD_WDT_MEM_MAP_SIZE);
- if (!wdtbase) {
- pr_err("failed to get wdtbase address\n");
- goto unreg_mem_region;
- }
-
- /* Enable watchdog timer and decode bit */
- outb(AMD_PM_WATCHDOG_EN_REG, AMD_IO_PM_INDEX_REG);
- val = inb(AMD_IO_PM_DATA_REG);
- val |= AMD_PM_WATCHDOG_TIMER_EN;
- outb(val, AMD_IO_PM_DATA_REG);
-
- /* Set the watchdog timer resolution */
- outb(AMD_PM_WATCHDOG_CONFIG_REG, AMD_IO_PM_INDEX_REG);
- val = inb(AMD_IO_PM_DATA_REG);
- /* Clear the previous frequency setting, if any */
- val &= ~AMD_PM_WATCHDOG_CONFIG_MASK;
-
- /*
- * Now set the frequency depending on the module load parameter.
- * In case the user passes an invalid argument, we consider the
- * frequency to be of 1 second resolution.
- */
- if (strncmp(frequency, "32us", 4) == 0)
- val |= AMD_PM_WATCHDOG_32USEC_RES;
- else if (strncmp(frequency, "10ms", 4) == 0)
- val |= AMD_PM_WATCHDOG_10MSEC_RES;
- else if (strncmp(frequency, "100ms", 5) == 0)
- val |= AMD_PM_WATCHDOG_100MSEC_RES;
- else {
- val |= AMD_PM_WATCHDOG_1SEC_RES;
- if (strncmp(frequency, "1s", 2) != 0)
- strncpy(frequency, "1s", 2);
- }
-
- outb(val, AMD_IO_PM_DATA_REG);
-
- /* Set the watchdog action depending on module load parameter. */
- val = readl(AMD_WDT_CONTROL(wdtbase));
-
- /*
- * If action is specified anything other than reboot or shutdown,
- * we default it to reboot.
- */
- if (strncmp(action, "shutdown", 8) == 0)
- val |= AMD_WDT_ACTION_RESET_BIT;
- else {
- val &= ~AMD_WDT_ACTION_RESET_BIT;
- /* The statement below is required for when the action
- * is set anything other than reboot.
- */
- if (strncmp(action, "reboot", 6) != 0)
- strncpy(action, "reboot", 6);
- }
-
- writel(val, AMD_WDT_CONTROL(wdtbase));
-
- return 1;
-
-unreg_mem_region:
- release_mem_region(wdtbase_phys, AMD_WDT_MEM_MAP_SIZE);
-exit:
- return 0;
-}
-
-static int amd_wdt_init(struct platform_device *dev)
-{
- int ret;
- u32 val;
-
- /* Identify our device and initialize watchdog hardware */
- if (!amd_wdt_setupdevice())
- return -ENODEV;
-
- /* Check to see if last reboot was due to watchdog timeout */
- val = readl(AMD_WDT_CONTROL(wdtbase));
- if (val & AMD_WDT_FIRED_BIT)
- bootstatus |= WDIOF_CARDRESET;
- else
- bootstatus &= ~WDIOF_CARDRESET;
-
- pr_info("Watchdog reboot %sdetected\n",
- (val & AMD_WDT_FIRED_BIT) ? "" : "not ");
-
- /* Clear out the old status */
- val |= AMD_WDT_FIRED_BIT;
- writel(val, AMD_WDT_CONTROL(wdtbase));
-
- /* Set Watchdog timeout */
- amd_wdt_timer_set_heartbeat(heartbeat);
-
- ret = misc_register(&amd_wdt_miscdev);
- if (ret != 0) {
- pr_err("Watchdog timer: cannot register miscdevice on minor="
- "%d (err=%d)\n", WATCHDOG_MINOR, ret);
- goto exit;
- }
-
- clear_bit(AMD_WDOG_DEV_OPEN, &status);
- if (nowayout)
- set_bit(AMD_WDOG_NO_WAY_OUT, &status);
-
- pr_info("initialized (0x%p). (heartbeat=%d units) (frequency=%s) "
- "(nowayout=%d) (action=%s)\n", wdtbase, heartbeat, frequency,
- nowayout, action);
-
- return 0;
-
-exit:
- iounmap(wdtbase);
- release_mem_region(wdtbase_phys, AMD_WDT_MEM_MAP_SIZE);
- return ret;
-}
-
-static void amd_wdt_cleanup(void)
-{
- /* Stop the timer before we leave */
- if (!nowayout)
- amd_wdt_timer_deactivate();
-
- misc_deregister(&amd_wdt_miscdev);
- iounmap(wdtbase);
- release_mem_region(wdtbase_phys, AMD_WDT_MEM_MAP_SIZE);
-}
-
-static int amd_wdt_remove(struct platform_device *dev)
-{
- if (wdtbase)
- amd_wdt_cleanup();
-
- return 0;
-}
-
-static void amd_wdt_shutdown(struct platform_device *dev)
-{
- amd_wdt_timer_deactivate();
-}
-
-static struct platform_driver amd_wdt_driver = {
- .probe = amd_wdt_init,
- .remove = amd_wdt_remove,
- .shutdown = amd_wdt_shutdown,
- .driver = {
- .owner = THIS_MODULE,
- .name = WDT_MODULE_NAME,
- },
-};
-
-static int __init amd_wdt_init_module(void)
-{
- int err;
-
- pr_info("AMD WatchDog Timer Driver v%s\n", WDT_VERSION);
-
- err = platform_driver_register(&amd_wdt_driver);
- if (err)
- return err;
-
- amd_wdt_platform_device = platform_device_register_simple(
- WDT_MODULE_NAME, -1, NULL, 0);
- if (IS_ERR(amd_wdt_platform_device)) {
- err = PTR_ERR(amd_wdt_platform_device);
- goto unreg_platform_driver;
- }
-
- return 0;
-
-unreg_platform_driver:
- platform_driver_unregister(&amd_wdt_driver);
- return err;
-}
-
-static void __exit amd_wdt_cleanup_module(void)
-{
- platform_device_unregister(amd_wdt_platform_device);
- platform_driver_unregister(&amd_wdt_driver);
- pr_info("AMD Watchdog Module Unloaded\n");
-}
-
-module_init(amd_wdt_init_module);
-module_exit(amd_wdt_cleanup_module);
-
-MODULE_AUTHOR("Arindam Nath <arindam.nath@amd.com>");
-MODULE_DESCRIPTION("Watchdog timer driver for AMD chipsets");
-MODULE_LICENSE("Dual BSD/GPL");