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path: root/drivers/char/watchdog/alim7101_wdt.c
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Diffstat (limited to 'drivers/char/watchdog/alim7101_wdt.c')
-rw-r--r--drivers/char/watchdog/alim7101_wdt.c423
1 files changed, 0 insertions, 423 deletions
diff --git a/drivers/char/watchdog/alim7101_wdt.c b/drivers/char/watchdog/alim7101_wdt.c
deleted file mode 100644
index 67aed9f8c362..000000000000
--- a/drivers/char/watchdog/alim7101_wdt.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/*
- * ALi M7101 PMU Computer Watchdog Timer driver
- *
- * Based on w83877f_wdt.c by Scott Jennings <linuxdrivers@oro.net>
- * and the Cobalt kernel WDT timer driver by Tim Hockin
- * <thockin@cobaltnet.com>
- *
- * (c)2002 Steve Hill <steve@navaho.co.uk>
- *
- * This WDT driver is different from most other Linux WDT
- * drivers in that the driver will ping the watchdog by itself,
- * because this particular WDT has a very short timeout (1.6
- * seconds) and it would be insane to count on any userspace
- * daemon always getting scheduled within that time frame.
- *
- * Additions:
- * Aug 23, 2004 - Added use_gpio module parameter for use on revision a1d PMUs
- * found on very old cobalt hardware.
- * -- Mike Waychison <michael.waychison@sun.com>
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/ioport.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/pci.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-#define OUR_NAME "alim7101_wdt"
-#define PFX OUR_NAME ": "
-
-#define WDT_ENABLE 0x9C
-#define WDT_DISABLE 0x8C
-
-#define ALI_7101_WDT 0x92
-#define ALI_7101_GPIO 0x7D
-#define ALI_7101_GPIO_O 0x7E
-#define ALI_WDT_ARM 0x01
-
-/*
- * We're going to use a 1 second timeout.
- * If we reset the watchdog every ~250ms we should be safe. */
-
-#define WDT_INTERVAL (HZ/4+1)
-
-/*
- * We must not require too good response from the userspace daemon.
- * Here we require the userspace daemon to send us a heartbeat
- * char to /dev/watchdog every 30 seconds.
- */
-
-#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-
-static int use_gpio = 0; /* Use the pic (for a1d revision alim7101) */
-module_param(use_gpio, int, 0);
-MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog. (required by old cobalt boards)");
-
-static void wdt_timer_ping(unsigned long);
-static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1);
-static unsigned long next_heartbeat;
-static unsigned long wdt_is_open;
-static char wdt_expect_close;
-static struct pci_dev *alim7101_pmu;
-
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
- __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-/*
- * Whack the dog
- */
-
-static void wdt_timer_ping(unsigned long data)
-{
- /* If we got a heartbeat pulse within the WDT_US_INTERVAL
- * we agree to ping the WDT
- */
- char tmp;
-
- if(time_before(jiffies, next_heartbeat))
- {
- /* Ping the WDT (this is actually a disarm/arm sequence) */
- pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
- pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
- pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
- if (use_gpio) {
- pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
- pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
- | 0x20);
- pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp
- & ~0x20);
- }
- } else {
- printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
- }
- /* Re-set the timer interval */
- mod_timer(&timer, jiffies + WDT_INTERVAL);
-}
-
-/*
- * Utility routines
- */
-
-static void wdt_change(int writeval)
-{
- char tmp;
-
- pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp);
- if (writeval == WDT_ENABLE) {
- pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM));
- if (use_gpio) {
- pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
- pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20);
- }
-
- } else {
- pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
- if (use_gpio) {
- pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp);
- pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20);
- }
- }
-}
-
-static void wdt_startup(void)
-{
- next_heartbeat = jiffies + (timeout * HZ);
-
- /* We must enable before we kick off the timer in case the timer
- occurs as we ping it */
-
- wdt_change(WDT_ENABLE);
-
- /* Start the timer */
- mod_timer(&timer, jiffies + WDT_INTERVAL);
-
- printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
-}
-
-static void wdt_turnoff(void)
-{
- /* Stop the timer */
- del_timer_sync(&timer);
- wdt_change(WDT_DISABLE);
- printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
-}
-
-static void wdt_keepalive(void)
-{
- /* user land ping */
- next_heartbeat = jiffies + (timeout * HZ);
-}
-
-/*
- * /dev/watchdog handling
- */
-
-static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
-{
- /* See if we got the magic character 'V' and reload the timer */
- if(count) {
- if (!nowayout) {
- size_t ofs;
-
- /* note: just in case someone wrote the magic character
- * five months ago... */
- wdt_expect_close = 0;
-
- /* now scan */
- for (ofs = 0; ofs != count; ofs++) {
- char c;
- if (get_user(c, buf+ofs))
- return -EFAULT;
- if (c == 'V')
- wdt_expect_close = 42;
- }
- }
- /* someone wrote to us, we should restart timer */
- wdt_keepalive();
- }
- return count;
-}
-
-static int fop_open(struct inode * inode, struct file * file)
-{
- /* Just in case we're already talking to someone... */
- if(test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
- /* Good, fire up the show */
- wdt_startup();
- return nonseekable_open(inode, file);
-}
-
-static int fop_close(struct inode * inode, struct file * file)
-{
- if(wdt_expect_close == 42)
- wdt_turnoff();
- else {
- /* wim: shouldn't there be a: del_timer(&timer); */
- printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
- }
- clear_bit(0, &wdt_is_open);
- wdt_expect_close = 0;
- return 0;
-}
-
-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static struct watchdog_info ident =
- {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
- .firmware_version = 1,
- .identity = "ALiM7101",
- };
-
- switch(cmd)
- {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- wdt_keepalive();
- return 0;
- case WDIOC_SETOPTIONS:
- {
- int new_options, retval = -EINVAL;
-
- if(get_user(new_options, p))
- return -EFAULT;
-
- if(new_options & WDIOS_DISABLECARD) {
- wdt_turnoff();
- retval = 0;
- }
-
- if(new_options & WDIOS_ENABLECARD) {
- wdt_startup();
- retval = 0;
- }
-
- return retval;
- }
- case WDIOC_SETTIMEOUT:
- {
- int new_timeout;
-
- if(get_user(new_timeout, p))
- return -EFAULT;
-
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
- return -EINVAL;
-
- timeout = new_timeout;
- wdt_keepalive();
- /* Fall through */
- }
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
- default:
- return -ENOTTY;
- }
-}
-
-static const struct file_operations wdt_fops = {
- .owner= THIS_MODULE,
- .llseek= no_llseek,
- .write= fop_write,
- .open= fop_open,
- .release= fop_close,
- .ioctl= fop_ioctl,
-};
-
-static struct miscdevice wdt_miscdev = {
- .minor=WATCHDOG_MINOR,
- .name="watchdog",
- .fops=&wdt_fops,
-};
-
-/*
- * Notifier for system down
- */
-
-static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
-{
- if (code==SYS_DOWN || code==SYS_HALT)
- wdt_turnoff();
-
- if (code==SYS_RESTART) {
- /*
- * Cobalt devices have no way of rebooting themselves other than
- * getting the watchdog to pull reset, so we restart the watchdog on
- * reboot with no heartbeat
- */
- wdt_change(WDT_ENABLE);
- printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
- }
- return NOTIFY_DONE;
-}
-
-/*
- * The WDT needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
- */
-
-static struct notifier_block wdt_notifier=
-{
- .notifier_call = wdt_notify_sys,
-};
-
-static void __exit alim7101_wdt_unload(void)
-{
- wdt_turnoff();
- /* Deregister */
- misc_deregister(&wdt_miscdev);
- unregister_reboot_notifier(&wdt_notifier);
- pci_dev_put(alim7101_pmu);
-}
-
-static int __init alim7101_wdt_init(void)
-{
- int rc = -EBUSY;
- struct pci_dev *ali1543_south;
- char tmp;
-
- printk(KERN_INFO PFX "Steve Hill <steve@navaho.co.uk>.\n");
- alim7101_pmu = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101,
- NULL);
- if (!alim7101_pmu) {
- printk(KERN_INFO PFX "ALi M7101 PMU not present - WDT not set\n");
- return -EBUSY;
- }
-
- /* Set the WDT in the PMU to 1 second */
- pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, 0x02);
-
- ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
- NULL);
- if (!ali1543_south) {
- printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set\n");
- goto err_out;
- }
- pci_read_config_byte(ali1543_south, 0x5e, &tmp);
- pci_dev_put(ali1543_south);
- if ((tmp & 0x1e) == 0x00) {
- if (!use_gpio) {
- printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'. If this is a cobalt board, set the 'use_gpio' module parameter.\n");
- goto err_out;
- }
- nowayout = 1;
- } else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) {
- printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
- goto err_out;
- }
-
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
- }
-
- rc = misc_register(&wdt_miscdev);
- if (rc) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- wdt_miscdev.minor, rc);
- goto err_out;
- }
-
- rc = register_reboot_notifier(&wdt_notifier);
- if (rc) {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- rc);
- goto err_out_miscdev;
- }
-
- if (nowayout) {
- __module_get(THIS_MODULE);
- }
-
- printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n",
- timeout, nowayout);
- return 0;
-
-err_out_miscdev:
- misc_deregister(&wdt_miscdev);
-err_out:
- pci_dev_put(alim7101_pmu);
- return rc;
-}
-
-module_init(alim7101_wdt_init);
-module_exit(alim7101_wdt_unload);
-
-static struct pci_device_id alim7101_pci_tbl[] __devinitdata = {
- { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533) },
- { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) },
- { }
-};
-
-MODULE_DEVICE_TABLE(pci, alim7101_pci_tbl);
-
-MODULE_AUTHOR("Steve Hill");
-MODULE_DESCRIPTION("ALi M7101 PMU Computer Watchdog Timer driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3 (git 2.39.0) at 2024-09-14 11:40:15 +0300