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yaml --- r: 6907 b: refs/heads/master c: a2f40cc h: refs/heads/master i: 6905: 3e14947 6903: 4932060 v: v3
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Kumar Gala
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Linus Torvalds
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Sep 5, 2005
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 886b9fa49900b055e20cd98f379fda49835d1ee6 | ||
| refs/heads/master: a2f40ccd294d14e5aca464c1913e8e0d8de35fca |
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * drivers/char/watchdog/booke_wdt.c | ||
| * | ||
| * Watchdog timer for PowerPC Book-E systems | ||
| * | ||
| * Author: Matthew McClintock | ||
| * Maintainer: Kumar Gala <kumar.gala@freescale.com> | ||
| * | ||
| * 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/config.h> | ||
| #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> | ||
|
|
||
| /* If the kernel parameter wdt_enable=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 4 /* Refer to the PPC40x and PPC4xx manuals */ | ||
| #endif /* for timing information */ | ||
|
|
||
| u32 wdt_enable = 0; | ||
| u32 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_enable: | ||
| */ | ||
| static __inline__ void booke_wdt_enable(void) | ||
| { | ||
| u32 val; | ||
|
|
||
| val = mfspr(SPRN_TCR); | ||
| val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(wdt_period)); | ||
|
|
||
| mtspr(SPRN_TCR, val); | ||
| } | ||
|
|
||
| /* | ||
| * booke_wdt_ping: | ||
| */ | ||
| static __inline__ void booke_wdt_ping(void) | ||
| { | ||
| mtspr(SPRN_TSR, TSR_ENW|TSR_WIS); | ||
| } | ||
|
|
||
| /* | ||
| * booke_wdt_write: | ||
| */ | ||
| static ssize_t booke_wdt_write (struct file *file, const char *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; | ||
|
|
||
| switch (cmd) { | ||
| case WDIOC_GETSUPPORT: | ||
| if (copy_to_user ((struct watchdog_info *) arg, &ident, | ||
| sizeof(struct watchdog_info))) | ||
| return -EFAULT; | ||
| case WDIOC_GETSTATUS: | ||
| return put_user(ident.options, (u32 *) arg); | ||
| 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(wdt_period, (u32 *) arg)) | ||
| return -EFAULT; | ||
| mtspr(SPRN_TCR, (mfspr(SPRN_TCR)&~WDTP(0))|WDTP(wdt_period)); | ||
| return 0; | ||
| case WDIOC_GETTIMEOUT: | ||
| return put_user(wdt_period, (u32 *) arg); | ||
| case WDIOC_SETOPTIONS: | ||
| if (get_user(tmp, (u32 *) arg)) | ||
| return -EINVAL; | ||
| if (tmp == WDIOS_ENABLECARD) { | ||
| booke_wdt_ping(); | ||
| break; | ||
| } else | ||
| return -EINVAL; | ||
| return 0; | ||
| default: | ||
| return -ENOIOCTLCMD; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
| /* | ||
| * booke_wdt_open: | ||
| */ | ||
| static int booke_wdt_open (struct inode *inode, struct file *file) | ||
| { | ||
| if (wdt_enable == 0) { | ||
| wdt_enable = 1; | ||
| booke_wdt_enable(); | ||
| printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", | ||
| wdt_period); | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static 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 = cpu_specs[0].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 (wdt_enable == 1) { | ||
| printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n", | ||
| wdt_period); | ||
| booke_wdt_enable(); | ||
| } | ||
|
|
||
| return ret; | ||
| } | ||
| device_initcall(booke_wdt_init); |