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drivers/watchdog/alim7101_wdt.c
10.8 KB
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/* * 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> |
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#include <linux/io.h> #include <linux/uaccess.h> |
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#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 */ |
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/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */ static int timeout = WATCHDOG_TIMEOUT; |
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module_param(timeout, int, 0); |
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); |
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|
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static int use_gpio; /* Use the pic (for a1d revision alim7101) */ |
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module_param(use_gpio, int, 0); |
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MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog (required by old cobalt boards)."); |
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static void wdt_timer_ping(unsigned long); |
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static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1); |
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static unsigned long next_heartbeat; static unsigned long wdt_is_open; static char wdt_expect_close; static struct pci_dev *alim7101_pmu; |
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static int nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, int, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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/* * 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 */ |
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char tmp; |
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|
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if (time_before(jiffies, next_heartbeat)) { |
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/* Ping the WDT (this is actually a disarm/arm sequence) */ pci_read_config_byte(alim7101_pmu, 0x92, &tmp); |
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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)); |
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if (use_gpio) { |
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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); |
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} } else { |
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printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog "); |
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} /* Re-set the timer interval */ |
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mod_timer(&timer, jiffies + WDT_INTERVAL); |
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} /* * Utility routines */ static void wdt_change(int writeval) { |
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char tmp; |
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pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp); if (writeval == WDT_ENABLE) { |
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pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM)); |
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if (use_gpio) { |
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pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20); |
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} } else { |
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pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM)); |
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if (use_gpio) { |
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pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20); |
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} } } 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 */ |
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mod_timer(&timer, jiffies + WDT_INTERVAL); |
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printk(KERN_INFO PFX "Watchdog timer is now enabled. "); } 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... "); } static void wdt_keepalive(void) { /* user land ping */ next_heartbeat = jiffies + (timeout * HZ); } /* * /dev/watchdog handling */ |
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static ssize_t fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
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{ /* See if we got the magic character 'V' and reload the timer */ |
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if (count) { |
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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; |
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if (get_user(c, buf + ofs)) |
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return -EFAULT; if (c == 'V') wdt_expect_close = 42; } } /* someone wrote to us, we should restart timer */ wdt_keepalive(); } return count; } |
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static int fop_open(struct inode *inode, struct file *file) |
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{ /* Just in case we're already talking to someone... */ |
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if (test_and_set_bit(0, &wdt_is_open)) |
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return -EBUSY; /* Good, fire up the show */ wdt_startup(); return nonseekable_open(inode, file); } |
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static int fop_close(struct inode *inode, struct file *file) |
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{ |
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if (wdt_expect_close == 42) |
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wdt_turnoff(); else { /* wim: shouldn't there be a: del_timer(&timer); */ |
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printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT! "); |
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} clear_bit(0, &wdt_is_open); wdt_expect_close = 0; return 0; } |
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static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
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{ void __user *argp = (void __user *)arg; int __user *p = argp; |
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static const struct watchdog_info ident = { |
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, |
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.firmware_version = 1, .identity = "ALiM7101", }; |
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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); |
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case WDIOC_SETOPTIONS: |
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{ |
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int new_options, retval = -EINVAL; |
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|
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if (get_user(new_options, p)) return -EFAULT; if (new_options & WDIOS_DISABLECARD) { wdt_turnoff(); retval = 0; |
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} |
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if (new_options & WDIOS_ENABLECARD) { wdt_startup(); retval = 0; |
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} |
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return retval; } |
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case WDIOC_KEEPALIVE: wdt_keepalive(); return 0; |
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case WDIOC_SETTIMEOUT: { int new_timeout; if (get_user(new_timeout, p)) return -EFAULT; /* arbitrary upper limit */ if (new_timeout < 1 || new_timeout > 3600) return -EINVAL; timeout = new_timeout; wdt_keepalive(); /* Fall through */ } case WDIOC_GETTIMEOUT: return put_user(timeout, p); default: return -ENOTTY; |
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} } |
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static const struct file_operations wdt_fops = { |
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.owner = THIS_MODULE, .llseek = no_llseek, .write = fop_write, .open = fop_open, .release = fop_close, .unlocked_ioctl = fop_ioctl, |
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}; static struct miscdevice wdt_miscdev = { |
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.minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &wdt_fops, |
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}; /* * Notifier for system down */ |
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static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) |
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{ |
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if (code == SYS_DOWN || code == SYS_HALT) |
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wdt_turnoff(); |
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if (code == SYS_RESTART) { |
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/* |
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* 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 |
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*/ wdt_change(WDT_ENABLE); |
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printk(KERN_INFO PFX "Watchdog timer is now enabled " "with no heartbeat - should reboot in ~1 second. "); |
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} return NOTIFY_DONE; } /* * The WDT needs to learn about soft shutdowns in order to * turn the timebomb registers off. */ |
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static struct notifier_block wdt_notifier = { |
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.notifier_call = wdt_notify_sys, }; static void __exit alim7101_wdt_unload(void) { wdt_turnoff(); /* Deregister */ misc_deregister(&wdt_miscdev); unregister_reboot_notifier(&wdt_notifier); |
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pci_dev_put(alim7101_pmu); |
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} 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>. "); |
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alim7101_pmu = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL); |
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if (!alim7101_pmu) { |
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printk(KERN_INFO PFX "ALi M7101 PMU not present - WDT not set "); |
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return -EBUSY; } /* Set the WDT in the PMU to 1 second */ pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, 0x02); |
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ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL); |
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if (!ali1543_south) { |
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printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set "); |
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goto err_out; |
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} pci_read_config_byte(ali1543_south, 0x5e, &tmp); |
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pci_dev_put(ali1543_south); |
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if ((tmp & 0x1e) == 0x00) { if (!use_gpio) { |
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printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'. " "If this is a cobalt board, set the 'use_gpio' " "module parameter. "); |
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goto err_out; |
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} |
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nowayout = 1; } else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) { |
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printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct " "revision number (???1001?) - WDT not set "); |
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goto err_out; |
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} |
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if (timeout < 1 || timeout > 3600) { /* arbitrary upper limit */ |
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timeout = WATCHDOG_TIMEOUT; |
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printk(KERN_INFO PFX "timeout value must be 1 <= x <= 3600, using %d ", timeout); |
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} |
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rc = register_reboot_notifier(&wdt_notifier); |
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if (rc) { |
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printk(KERN_ERR PFX "cannot register reboot notifier (err=%d) ", rc); |
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goto err_out; } |
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rc = misc_register(&wdt_miscdev); |
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if (rc) { |
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printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d) ", |
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wdt_miscdev.minor, rc); goto err_out_reboot; |
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} |
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if (nowayout) |
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__module_get(THIS_MODULE); |
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|
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printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. " "timeout=%d sec (nowayout=%d) ", |
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timeout, nowayout); return 0; |
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err_out_reboot: unregister_reboot_notifier(&wdt_notifier); |
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err_out: |
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pci_dev_put(alim7101_pmu); |
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return rc; } module_init(alim7101_wdt_init); module_exit(alim7101_wdt_unload); |
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static DEFINE_PCI_DEVICE_TABLE(alim7101_pci_tbl) __used = { |
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{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533) }, { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) }, |
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{ } }; MODULE_DEVICE_TABLE(pci, alim7101_pci_tbl); |
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MODULE_AUTHOR("Steve Hill"); MODULE_DESCRIPTION("ALi M7101 PMU Computer Watchdog Timer driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |