diff options
Diffstat (limited to 'drivers/watchdog/w83697hf_wdt.c')
| -rw-r--r-- | drivers/watchdog/w83697hf_wdt.c | 460 |
1 files changed, 0 insertions, 460 deletions
diff --git a/drivers/watchdog/w83697hf_wdt.c b/drivers/watchdog/w83697hf_wdt.c deleted file mode 100644 index e9ea856b8ff..00000000000 --- a/drivers/watchdog/w83697hf_wdt.c +++ /dev/null @@ -1,460 +0,0 @@ -/* - * w83697hf/hg WDT driver - * - * (c) Copyright 2006 Samuel Tardieu <sam@rfc1149.net> - * (c) Copyright 2006 Marcus Junker <junker@anduras.de> - * - * Based on w83627hf_wdt.c which is based on advantechwdt.c - * which is based on wdt.c. - * Original copyright messages: - * - * (c) Copyright 2003 Pádraig Brady <P@draigBrady.com> - * - * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> - * - * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, - * All Rights Reserved. - * - * 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 Marcus Junker nor ANDURAS AG admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/ioport.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/io.h> -#include <linux/uaccess.h> - - -#define WATCHDOG_NAME "w83697hf/hg WDT" -#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ -#define WATCHDOG_EARLY_DISABLE 1 /* Disable until userland kicks in */ - -static unsigned long wdt_is_open; -static char expect_close; -static DEFINE_SPINLOCK(io_lock); - -/* You must set this - there is no sane way to probe for this board. */ -static int wdt_io = 0x2e; -module_param(wdt_io, int, 0); -MODULE_PARM_DESC(wdt_io, - "w83697hf/hg WDT io port (default 0x2e, 0 = autodetect)"); - -static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in seconds. 1<= timeout <=255 (default=" - __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); - -static bool nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -static int early_disable = WATCHDOG_EARLY_DISABLE; -module_param(early_disable, int, 0); -MODULE_PARM_DESC(early_disable, - "Watchdog gets disabled at boot time (default=" - __MODULE_STRING(WATCHDOG_EARLY_DISABLE) ")"); - -/* - * Kernel methods. - */ - -#define W83697HF_EFER (wdt_io + 0) /* Extended Function Enable Register */ -#define W83697HF_EFIR (wdt_io + 0) /* Extended Function Index Register - (same as EFER) */ -#define W83697HF_EFDR (wdt_io + 1) /* Extended Function Data Register */ - -static inline void w83697hf_unlock(void) -{ - outb_p(0x87, W83697HF_EFER); /* Enter extended function mode */ - outb_p(0x87, W83697HF_EFER); /* Again according to manual */ -} - -static inline void w83697hf_lock(void) -{ - outb_p(0xAA, W83697HF_EFER); /* Leave extended function mode */ -} - -/* - * The three functions w83697hf_get_reg(), w83697hf_set_reg() and - * w83697hf_write_timeout() must be called with the device unlocked. - */ - -static unsigned char w83697hf_get_reg(unsigned char reg) -{ - outb_p(reg, W83697HF_EFIR); - return inb_p(W83697HF_EFDR); -} - -static void w83697hf_set_reg(unsigned char reg, unsigned char data) -{ - outb_p(reg, W83697HF_EFIR); - outb_p(data, W83697HF_EFDR); -} - -static void w83697hf_write_timeout(int timeout) -{ - /* Write Timeout counter to CRF4 */ - w83697hf_set_reg(0xF4, timeout); -} - -static void w83697hf_select_wdt(void) -{ - w83697hf_unlock(); - w83697hf_set_reg(0x07, 0x08); /* Switch to logic device 8 (GPIO2) */ -} - -static inline void w83697hf_deselect_wdt(void) -{ - w83697hf_lock(); -} - -static void w83697hf_init(void) -{ - unsigned char bbuf; - - w83697hf_select_wdt(); - - bbuf = w83697hf_get_reg(0x29); - bbuf &= ~0x60; - bbuf |= 0x20; - - /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ - w83697hf_set_reg(0x29, bbuf); - - bbuf = w83697hf_get_reg(0xF3); - bbuf &= ~0x04; - w83697hf_set_reg(0xF3, bbuf); /* Count mode is seconds */ - - w83697hf_deselect_wdt(); -} - -static void wdt_ping(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_write_timeout(timeout); - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static void wdt_enable(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_write_timeout(timeout); - w83697hf_set_reg(0x30, 1); /* Enable timer */ - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static void wdt_disable(void) -{ - spin_lock(&io_lock); - w83697hf_select_wdt(); - - w83697hf_set_reg(0x30, 0); /* Disable timer */ - w83697hf_write_timeout(0); - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); -} - -static unsigned char wdt_running(void) -{ - unsigned char t; - - spin_lock(&io_lock); - w83697hf_select_wdt(); - - t = w83697hf_get_reg(0xF4); /* Read timer */ - - w83697hf_deselect_wdt(); - spin_unlock(&io_lock); - - return t; -} - -static int wdt_set_heartbeat(int t) -{ - if (t < 1 || t > 255) - return -EINVAL; - - timeout = t; - return 0; -} - -static ssize_t wdt_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - wdt_ping(); - } - return count; -} - -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_timeout; - static const struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT - | WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "W83697HF WDT", - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - return -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - wdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - wdt_enable(); - retval = 0; - } - - return retval; - } - - case WDIOC_KEEPALIVE: - wdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if (wdt_set_heartbeat(new_timeout)) - return -EINVAL; - wdt_ping(); - /* Fall */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - default: - return -ENOTTY; - } - return 0; -} - -static int wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - /* - * Activate - */ - - wdt_enable(); - return nonseekable_open(inode, file); -} - -static int wdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) - wdt_disable(); - else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - wdt_ping(); - } - expect_close = 0; - clear_bit(0, &wdt_is_open); - return 0; -} - -/* - * Notifier for system down - */ - -static int wdt_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - wdt_disable(); /* Turn the WDT off */ - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wdt_write, - .unlocked_ioctl = wdt_ioctl, - .open = wdt_open, - .release = wdt_close, -}; - -static struct miscdevice wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wdt_fops, -}; - -/* - * The WDT needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wdt_notifier = { - .notifier_call = wdt_notify_sys, -}; - -static int w83697hf_check_wdt(void) -{ - if (!request_region(wdt_io, 2, WATCHDOG_NAME)) { - pr_err("I/O address 0x%x already in use\n", wdt_io); - return -EIO; - } - - pr_debug("Looking for watchdog at address 0x%x\n", wdt_io); - w83697hf_unlock(); - if (w83697hf_get_reg(0x20) == 0x60) { - pr_info("watchdog found at address 0x%x\n", wdt_io); - w83697hf_lock(); - return 0; - } - /* Reprotect in case it was a compatible device */ - w83697hf_lock(); - - pr_info("watchdog not found at address 0x%x\n", wdt_io); - release_region(wdt_io, 2); - return -EIO; -} - -static int w83697hf_ioports[] = { 0x2e, 0x4e, 0x00 }; - -static int __init wdt_init(void) -{ - int ret, i, found = 0; - - pr_info("WDT driver for W83697HF/HG initializing\n"); - - if (wdt_io == 0) { - /* we will autodetect the W83697HF/HG watchdog */ - for (i = 0; ((!found) && (w83697hf_ioports[i] != 0)); i++) { - wdt_io = w83697hf_ioports[i]; - if (!w83697hf_check_wdt()) - found++; - } - } else { - if (!w83697hf_check_wdt()) - found++; - } - - if (!found) { - pr_err("No W83697HF/HG could be found\n"); - ret = -ENODEV; - goto out; - } - - w83697hf_init(); - if (early_disable) { - if (wdt_running()) - pr_warn("Stopping previously enabled watchdog until userland kicks in\n"); - wdt_disable(); - } - - if (wdt_set_heartbeat(timeout)) { - wdt_set_heartbeat(WATCHDOG_TIMEOUT); - pr_info("timeout value must be 1 <= timeout <= 255, using %d\n", - WATCHDOG_TIMEOUT); - } - - ret = register_reboot_notifier(&wdt_notifier); - if (ret != 0) { - pr_err("cannot register reboot notifier (err=%d)\n", ret); - goto unreg_regions; - } - - ret = misc_register(&wdt_miscdev); - if (ret != 0) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto unreg_reboot; - } - - pr_info("initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - -out: - return ret; -unreg_reboot: - unregister_reboot_notifier(&wdt_notifier); -unreg_regions: - release_region(wdt_io, 2); - goto out; -} - -static void __exit wdt_exit(void) -{ - misc_deregister(&wdt_miscdev); - unregister_reboot_notifier(&wdt_notifier); - release_region(wdt_io, 2); -} - -module_init(wdt_init); -module_exit(wdt_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Marcus Junker <junker@anduras.de>"); -MODULE_AUTHOR("Samuel Tardieu <sam@rfc1149.net>"); -MODULE_DESCRIPTION("w83697hf/hg WDT driver"); |