diff options
Diffstat (limited to 'drivers/char/watchdog/alim7101_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/alim7101_wdt.c | 423 |
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 67aed9f8c36..00000000000 --- 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); |