diff options
Diffstat (limited to 'drivers/char/watchdog/sa1100_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/sa1100_wdt.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/drivers/char/watchdog/sa1100_wdt.c b/drivers/char/watchdog/sa1100_wdt.c deleted file mode 100644 index 3475f47aaa4..00000000000 --- a/drivers/char/watchdog/sa1100_wdt.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Watchdog driver for the SA11x0/PXA2xx - * - * (c) Copyright 2000 Oleg Drokin <green@crimea.edu> - * Based on SoftDog driver by Alan Cox <alan@redhat.com> - * - * 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 Oleg Drokin nor iXcelerator.com admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 2000 Oleg Drokin <green@crimea.edu> - * - * 27/11/2000 Initial release - */ -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/init.h> - -#ifdef CONFIG_ARCH_PXA -#include <asm/arch/pxa-regs.h> -#endif - -#include <asm/hardware.h> -#include <asm/bitops.h> -#include <asm/uaccess.h> - -#define OSCR_FREQ CLOCK_TICK_RATE - -static unsigned long sa1100wdt_users; -static int pre_margin; -static int boot_status; - -/* - * Allow only one person to hold it open - */ -static int sa1100dog_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(1,&sa1100wdt_users)) - return -EBUSY; - - /* Activate SA1100 Watchdog timer */ - OSMR3 = OSCR + pre_margin; - OSSR = OSSR_M3; - OWER = OWER_WME; - OIER |= OIER_E3; - return nonseekable_open(inode, file); -} - -/* - * The watchdog cannot be disabled. - * - * Previous comments suggested that turning off the interrupt by - * clearing OIER[E3] would prevent the watchdog timing out but this - * does not appear to be true (at least on the PXA255). - */ -static int sa1100dog_release(struct inode *inode, struct file *file) -{ - printk(KERN_CRIT "WATCHDOG: Device closed - timer will not stop\n"); - - clear_bit(1, &sa1100wdt_users); - - return 0; -} - -static ssize_t sa1100dog_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) -{ - if (len) - /* Refresh OSMR3 timer. */ - OSMR3 = OSCR + pre_margin; - - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .identity = "SA1100/PXA255 Watchdog", -}; - -static int sa1100dog_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int ret = -ENOTTY; - int time; - void __user *argp = (void __user *)arg; - int __user *p = argp; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user(argp, &ident, - sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - ret = put_user(0, p); - break; - - case WDIOC_GETBOOTSTATUS: - ret = put_user(boot_status, p); - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, p); - if (ret) - break; - - if (time <= 0 || time > 255) { - ret = -EINVAL; - break; - } - - pre_margin = OSCR_FREQ * time; - OSMR3 = OSCR + pre_margin; - /*fall through*/ - - case WDIOC_GETTIMEOUT: - ret = put_user(pre_margin / OSCR_FREQ, p); - break; - - case WDIOC_KEEPALIVE: - OSMR3 = OSCR + pre_margin; - ret = 0; - break; - } - return ret; -} - -static const struct file_operations sa1100dog_fops = -{ - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = sa1100dog_write, - .ioctl = sa1100dog_ioctl, - .open = sa1100dog_open, - .release = sa1100dog_release, -}; - -static struct miscdevice sa1100dog_miscdev = -{ - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &sa1100dog_fops, -}; - -static int margin __initdata = 60; /* (secs) Default is 1 minute */ - -static int __init sa1100dog_init(void) -{ - int ret; - - /* - * Read the reset status, and save it for later. If - * we suspend, RCSR will be cleared, and the watchdog - * reset reason will be lost. - */ - boot_status = (RCSR & RCSR_WDR) ? WDIOF_CARDRESET : 0; - pre_margin = OSCR_FREQ * margin; - - ret = misc_register(&sa1100dog_miscdev); - if (ret == 0) - printk("SA1100/PXA2xx Watchdog Timer: timer margin %d sec\n", - margin); - return ret; -} - -static void __exit sa1100dog_exit(void) -{ - misc_deregister(&sa1100dog_miscdev); -} - -module_init(sa1100dog_init); -module_exit(sa1100dog_exit); - -MODULE_AUTHOR("Oleg Drokin <green@crimea.edu>"); -MODULE_DESCRIPTION("SA1100/PXA2xx Watchdog"); - -module_param(margin, int, 0); -MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)"); - -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |