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drivers/watchdog/m54xx_wdt.c
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/* |
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* drivers/watchdog/m54xx_wdt.c |
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* |
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* Watchdog driver for ColdFire MCF547x & MCF548x processors |
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* Copyright 2010 (c) Philippe De Muyter <phdm@macqel.be> * * Adapted from the IXP4xx watchdog driver, which carries these notices: * * Author: Deepak Saxena <dsaxena@plexity.net> * * Copyright 2004 (c) MontaVista, Software, Inc. * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#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/ioport.h> #include <linux/uaccess.h> #include <asm/coldfire.h> |
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#include <asm/m54xxsim.h> #include <asm/m54xxgpt.h> |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */ static unsigned long wdt_status; #define WDT_IN_USE 0 #define WDT_OK_TO_CLOSE 1 static void wdt_enable(void) { unsigned int gms0; /* preserve GPIO usage, if any */ |
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gms0 = __raw_readl(MCF_GPT_GMS0); |
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if (gms0 & MCF_GPT_GMS_TMS_GPIO) gms0 &= (MCF_GPT_GMS_TMS_GPIO | MCF_GPT_GMS_GPIO_MASK | MCF_GPT_GMS_OD); else gms0 = MCF_GPT_GMS_TMS_GPIO | MCF_GPT_GMS_OD; |
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__raw_writel(gms0, MCF_GPT_GMS0); |
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__raw_writel(MCF_GPT_GCIR_PRE(heartbeat*(MCF_BUSCLK/0xffff)) | |
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MCF_GPT_GCIR_CNT(0xffff), MCF_GPT_GCIR0); |
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gms0 |= MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE; |
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__raw_writel(gms0, MCF_GPT_GMS0); |
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} static void wdt_disable(void) { unsigned int gms0; /* disable watchdog */ |
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gms0 = __raw_readl(MCF_GPT_GMS0); |
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gms0 &= ~(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE); |
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__raw_writel(gms0, MCF_GPT_GMS0); |
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} static void wdt_keepalive(void) { unsigned int gms0; |
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gms0 = __raw_readl(MCF_GPT_GMS0); |
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gms0 |= MCF_GPT_GMS_OCPW(0xA5); |
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__raw_writel(gms0, MCF_GPT_GMS0); |
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} |
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static int m54xx_wdt_open(struct inode *inode, struct file *file) |
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{ if (test_and_set_bit(WDT_IN_USE, &wdt_status)) return -EBUSY; clear_bit(WDT_OK_TO_CLOSE, &wdt_status); wdt_enable(); return nonseekable_open(inode, file); } |
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static ssize_t m54xx_wdt_write(struct file *file, const char *data, |
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size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; clear_bit(WDT_OK_TO_CLOSE, &wdt_status); for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') set_bit(WDT_OK_TO_CLOSE, &wdt_status); } } wdt_keepalive(); } return len; } static const struct watchdog_info ident = { .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, |
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.identity = "Coldfire M54xx Watchdog", |
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}; |
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static long m54xx_wdt_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) { int ret = -ENOTTY; int time; switch (cmd) { case WDIOC_GETSUPPORT: ret = copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)) ? -EFAULT : 0; break; case WDIOC_GETSTATUS: ret = put_user(0, (int *)arg); break; case WDIOC_GETBOOTSTATUS: ret = put_user(0, (int *)arg); break; case WDIOC_KEEPALIVE: wdt_keepalive(); ret = 0; break; case WDIOC_SETTIMEOUT: ret = get_user(time, (int *)arg); if (ret) break; if (time <= 0 || time > 30) { ret = -EINVAL; break; } heartbeat = time; wdt_enable(); /* Fall through */ case WDIOC_GETTIMEOUT: ret = put_user(heartbeat, (int *)arg); break; } return ret; } |
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static int m54xx_wdt_release(struct inode *inode, struct file *file) |
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{ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) wdt_disable(); else { |
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pr_crit("Device closed unexpectedly - timer will not stop "); |
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wdt_keepalive(); } clear_bit(WDT_IN_USE, &wdt_status); clear_bit(WDT_OK_TO_CLOSE, &wdt_status); return 0; } |
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static const struct file_operations m54xx_wdt_fops = { |
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.owner = THIS_MODULE, .llseek = no_llseek, |
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.write = m54xx_wdt_write, .unlocked_ioctl = m54xx_wdt_ioctl, .open = m54xx_wdt_open, .release = m54xx_wdt_release, |
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}; |
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static struct miscdevice m54xx_wdt_miscdev = { |
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.minor = WATCHDOG_MINOR, .name = "watchdog", |
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.fops = &m54xx_wdt_fops, |
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}; |
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static int __init m54xx_wdt_init(void) |
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{ |
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if (!request_mem_region(MCF_GPT_GCIR0, 4, "Coldfire M54xx Watchdog")) { |
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pr_warn("I/O region busy "); |
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return -EBUSY; } |
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pr_info("driver is loaded "); |
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return misc_register(&m54xx_wdt_miscdev); |
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} |
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static void __exit m54xx_wdt_exit(void) |
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{ |
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misc_deregister(&m54xx_wdt_miscdev); |
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release_mem_region(MCF_GPT_GCIR0, 4); |
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} |
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module_init(m54xx_wdt_init); module_exit(m54xx_wdt_exit); |
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MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>"); |
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MODULE_DESCRIPTION("Coldfire M54xx Watchdog"); |
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module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 30s)"); |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |