diff options
Diffstat (limited to 'drivers/char/watchdog/booke_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/booke_wdt.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/drivers/char/watchdog/booke_wdt.c b/drivers/char/watchdog/booke_wdt.c deleted file mode 100644 index d362f5bf658a..000000000000 --- a/drivers/char/watchdog/booke_wdt.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * drivers/char/watchdog/booke_wdt.c - * - * Watchdog timer for PowerPC Book-E systems - * - * Author: Matthew McClintock - * Maintainer: Kumar Gala <galak@kernel.crashing.org> - * - * Copyright 2005 Freescale Semiconductor Inc. - * - * 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. - */ - -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/notifier.h> -#include <linux/watchdog.h> - -#include <asm/reg_booke.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -/* If the kernel parameter wdt=1, the watchdog will be enabled at boot. - * Also, the wdt_period sets the watchdog timer period timeout. - * For E500 cpus the wdt_period sets which bit changing from 0->1 will - * trigger a watchog timeout. This watchdog timeout will occur 3 times, the - * first time nothing will happen, the second time a watchdog exception will - * occur, and the final time the board will reset. - */ - -#ifdef CONFIG_FSL_BOOKE -#define WDT_PERIOD_DEFAULT 63 /* Ex. wdt_period=28 bus=333Mhz , reset=~40sec */ -#else -#define WDT_PERIOD_DEFAULT 3 /* Refer to the PPC40x and PPC4xx manuals */ -#endif /* for timing information */ - -u32 booke_wdt_enabled = 0; -u32 booke_wdt_period = WDT_PERIOD_DEFAULT; - -#ifdef CONFIG_FSL_BOOKE -#define WDTP(x) ((((63-x)&0x3)<<30)|(((63-x)&0x3c)<<15)) -#else -#define WDTP(x) (TCR_WP(x)) -#endif - -/* - * booke_wdt_ping: - */ -static __inline__ void booke_wdt_ping(void) -{ - mtspr(SPRN_TSR, TSR_ENW|TSR_WIS); -} - -/* - * booke_wdt_enable: - */ -static __inline__ void booke_wdt_enable(void) -{ - u32 val; - - /* clear status before enabling watchdog */ - booke_wdt_ping(); - val = mfspr(SPRN_TCR); - val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period)); - - mtspr(SPRN_TCR, val); -} - -/* - * booke_wdt_write: - */ -static ssize_t booke_wdt_write (struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - booke_wdt_ping(); - return count; -} - -static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .firmware_version = 0, - .identity = "PowerPC Book-E Watchdog", -}; - -/* - * booke_wdt_ioctl: - */ -static int booke_wdt_ioctl (struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - u32 tmp = 0; - u32 __user *p = (u32 __user *)arg; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user ((struct watchdog_info __user *) arg, &ident, - sizeof(struct watchdog_info))) - return -EFAULT; - case WDIOC_GETSTATUS: - return put_user(ident.options, p); - case WDIOC_GETBOOTSTATUS: - /* XXX: something is clearing TSR */ - tmp = mfspr(SPRN_TSR) & TSR_WRS(3); - /* returns 1 if last reset was caused by the WDT */ - return (tmp ? 1 : 0); - case WDIOC_KEEPALIVE: - booke_wdt_ping(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(booke_wdt_period, p)) - return -EFAULT; - mtspr(SPRN_TCR, (mfspr(SPRN_TCR)&~WDTP(0))|WDTP(booke_wdt_period)); - return 0; - case WDIOC_GETTIMEOUT: - return put_user(booke_wdt_period, p); - case WDIOC_SETOPTIONS: - if (get_user(tmp, p)) - return -EINVAL; - if (tmp == WDIOS_ENABLECARD) { - booke_wdt_ping(); - break; - } else - return -EINVAL; - return 0; - default: - return -ENOTTY; - } - - return 0; -} -/* - * booke_wdt_open: - */ -static int booke_wdt_open (struct inode *inode, struct file *file) -{ - if (booke_wdt_enabled == 0) { - booke_wdt_enabled = 1; - booke_wdt_enable(); - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", - booke_wdt_period); - } - - return nonseekable_open(inode, file); -} - -static const struct file_operations booke_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = booke_wdt_write, - .ioctl = booke_wdt_ioctl, - .open = booke_wdt_open, -}; - -static struct miscdevice booke_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &booke_wdt_fops, -}; - -static void __exit booke_wdt_exit(void) -{ - misc_deregister(&booke_wdt_miscdev); -} - -/* - * booke_wdt_init: - */ -static int __init booke_wdt_init(void) -{ - int ret = 0; - - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Loaded\n"); - ident.firmware_version = cur_cpu_spec->pvr_value; - - ret = misc_register(&booke_wdt_miscdev); - if (ret) { - printk (KERN_CRIT "Cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - return ret; - } - - if (booke_wdt_enabled == 1) { - printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", - booke_wdt_period); - booke_wdt_enable(); - } - - return ret; -} -device_initcall(booke_wdt_init); |