/* * Watchdog driver for the SA11x0/PXA2xx * * (c) Copyright 2000 Oleg Drokin <green@crimea.edu> * Based on SoftDog driver by Alan Cox <alan@lxorguk.ukuu.org.uk> * * 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> #include <linux/bitops.h> #include <linux/uaccess.h> #include <linux/timex.h> #ifdef CONFIG_ARCH_PXA #include <mach/regs-ost.h> #endif #include <mach/reset.h> #include <mach/hardware.h> static unsigned long oscr_freq; static unsigned long sa1100wdt_users; static unsigned 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 const struct watchdog_info ident = { .options = WDIOF_CARDRESET | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = "SA1100/PXA255 Watchdog", .firmware_version = 1, }; static long sa1100dog_ioctl(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_KEEPALIVE: OSMR3 = OSCR + pre_margin; ret = 0; break; case WDIOC_SETTIMEOUT: ret = get_user(time, p); if (ret) break; if (time <= 0 || (oscr_freq * (long long)time >= 0xffffffff)) { 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; } return ret; } static const struct file_operations sa1100dog_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = sa1100dog_write, .unlocked_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; oscr_freq = get_clock_tick_rate(); /* * 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 = (reset_status & RESET_STATUS_WATCHDOG) ? WDIOF_CARDRESET : 0; pre_margin = oscr_freq * margin; ret = misc_register(&sa1100dog_miscdev); if (ret == 0) printk(KERN_INFO "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);