diff options
Diffstat (limited to 'drivers/char/watchdog/sc1200wdt.c')
| -rw-r--r-- | drivers/char/watchdog/sc1200wdt.c | 463 |
1 files changed, 0 insertions, 463 deletions
diff --git a/drivers/char/watchdog/sc1200wdt.c b/drivers/char/watchdog/sc1200wdt.c deleted file mode 100644 index 9670d47190d..00000000000 --- a/drivers/char/watchdog/sc1200wdt.c +++ /dev/null @@ -1,463 +0,0 @@ -/* - * National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver - * (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>, - * All Rights Reserved. - * Based on wdt.c and wdt977.c by Alan Cox and Woody Suwalski respectively. - * - * 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. - * - * The author(s) of this software shall not be held liable for damages - * of any nature resulting due to the use of this software. This - * software is provided AS-IS with no warranties. - * - * Changelog: - * 20020220 Zwane Mwaikambo Code based on datasheet, no hardware. - * 20020221 Zwane Mwaikambo Cleanups as suggested by Jeff Garzik and Alan Cox. - * 20020222 Zwane Mwaikambo Added probing. - * 20020225 Zwane Mwaikambo Added ISAPNP support. - * 20020412 Rob Radez Broke out start/stop functions - * <rob@osinvestor.com> Return proper status instead of temperature warning - * Add WDIOC_GETBOOTSTATUS and WDIOC_SETOPTIONS ioctls - * Fix CONFIG_WATCHDOG_NOWAYOUT - * 20020530 Joel Becker Add Matt Domsch's nowayout module option - * 20030116 Adam Belay Updated to the latest pnp code - * - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/ioport.h> -#include <linux/spinlock.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/pnp.h> -#include <linux/fs.h> - -#include <asm/semaphore.h> -#include <asm/io.h> -#include <asm/uaccess.h> - -#define SC1200_MODULE_VER "build 20020303" -#define SC1200_MODULE_NAME "sc1200wdt" -#define PFX SC1200_MODULE_NAME ": " - -#define MAX_TIMEOUT 255 /* 255 minutes */ -#define PMIR (io) /* Power Management Index Register */ -#define PMDR (io+1) /* Power Management Data Register */ - -/* Data Register indexes */ -#define FER1 0x00 /* Function enable register 1 */ -#define FER2 0x01 /* Function enable register 2 */ -#define PMC1 0x02 /* Power Management Ctrl 1 */ -#define PMC2 0x03 /* Power Management Ctrl 2 */ -#define PMC3 0x04 /* Power Management Ctrl 3 */ -#define WDTO 0x05 /* Watchdog timeout register */ -#define WDCF 0x06 /* Watchdog config register */ -#define WDST 0x07 /* Watchdog status register */ - -/* WDCF bitfields - which devices assert WDO */ -#define KBC_IRQ 0x01 /* Keyboard Controller */ -#define MSE_IRQ 0x02 /* Mouse */ -#define UART1_IRQ 0x03 /* Serial0 */ -#define UART2_IRQ 0x04 /* Serial1 */ -/* 5 -7 are reserved */ - -static char banner[] __initdata = KERN_INFO PFX SC1200_MODULE_VER; -static int timeout = 1; -static int io = -1; -static int io_len = 2; /* for non plug and play */ -static struct semaphore open_sem; -static char expect_close; -static spinlock_t sc1200wdt_lock; /* io port access serialisation */ - -#if defined CONFIG_PNP -static int isapnp = 1; -static struct pnp_dev *wdt_dev; - -module_param(isapnp, int, 0); -MODULE_PARM_DESC(isapnp, "When set to 0 driver ISA PnP support will be disabled"); -#endif - -module_param(io, int, 0); -MODULE_PARM_DESC(io, "io port"); -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, "range is 0-255 minutes, default is 1"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - - - -/* Read from Data Register */ -static inline void sc1200wdt_read_data(unsigned char index, unsigned char *data) -{ - spin_lock(&sc1200wdt_lock); - outb_p(index, PMIR); - *data = inb(PMDR); - spin_unlock(&sc1200wdt_lock); -} - - -/* Write to Data Register */ -static inline void sc1200wdt_write_data(unsigned char index, unsigned char data) -{ - spin_lock(&sc1200wdt_lock); - outb_p(index, PMIR); - outb(data, PMDR); - spin_unlock(&sc1200wdt_lock); -} - - -static void sc1200wdt_start(void) -{ - unsigned char reg; - - sc1200wdt_read_data(WDCF, ®); - /* assert WDO when any of the following interrupts are triggered too */ - reg |= (KBC_IRQ | MSE_IRQ | UART1_IRQ | UART2_IRQ); - sc1200wdt_write_data(WDCF, reg); - /* set the timeout and get the ball rolling */ - sc1200wdt_write_data(WDTO, timeout); -} - - -static void sc1200wdt_stop(void) -{ - sc1200wdt_write_data(WDTO, 0); -} - - -/* This returns the status of the WDO signal, inactive high. */ -static inline int sc1200wdt_status(void) -{ - unsigned char ret; - - sc1200wdt_read_data(WDST, &ret); - /* If the bit is inactive, the watchdog is enabled, so return - * KEEPALIVEPING which is a bit of a kludge because there's nothing - * else for enabled/disabled status - */ - return (ret & 0x01) ? 0 : WDIOF_KEEPALIVEPING; /* bits 1 - 7 are undefined */ -} - - -static int sc1200wdt_open(struct inode *inode, struct file *file) -{ - /* allow one at a time */ - if (down_trylock(&open_sem)) - return -EBUSY; - - if (timeout > MAX_TIMEOUT) - timeout = MAX_TIMEOUT; - - sc1200wdt_start(); - printk(KERN_INFO PFX "Watchdog enabled, timeout = %d min(s)", timeout); - - return nonseekable_open(inode, file); -} - - -static int sc1200wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) -{ - int new_timeout; - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, - .firmware_version = 0, - .identity = "PC87307/PC97307", - }; - - switch (cmd) { - default: - return -ENOTTY; - - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof ident)) - return -EFAULT; - return 0; - - case WDIOC_GETSTATUS: - return put_user(sc1200wdt_status(), p); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - sc1200wdt_write_data(WDTO, timeout); - return 0; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - - /* the API states this is given in secs */ - new_timeout /= 60; - if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) - return -EINVAL; - - timeout = new_timeout; - sc1200wdt_write_data(WDTO, timeout); - /* fall through and return the new timeout */ - - case WDIOC_GETTIMEOUT: - return put_user(timeout * 60, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - sc1200wdt_stop(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - sc1200wdt_start(); - retval = 0; - } - - return retval; - } - } -} - - -static int sc1200wdt_release(struct inode *inode, struct file *file) -{ - if (expect_close == 42) { - sc1200wdt_stop(); - printk(KERN_INFO PFX "Watchdog disabled\n"); - } else { - sc1200wdt_write_data(WDTO, timeout); - printk(KERN_CRIT PFX "Unexpected close!, timeout = %d min(s)\n", timeout); - } - up(&open_sem); - expect_close = 0; - - return 0; -} - - -static ssize_t sc1200wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) -{ - if (len) { - if (!nowayout) { - size_t i; - - expect_close = 0; - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data+i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - - sc1200wdt_write_data(WDTO, timeout); - return len; - } - - return 0; -} - - -static int sc1200wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - sc1200wdt_stop(); - - return NOTIFY_DONE; -} - - -static struct notifier_block sc1200wdt_notifier = -{ - .notifier_call = sc1200wdt_notify_sys, -}; - -static const struct file_operations sc1200wdt_fops = -{ - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = sc1200wdt_write, - .ioctl = sc1200wdt_ioctl, - .open = sc1200wdt_open, - .release = sc1200wdt_release, -}; - -static struct miscdevice sc1200wdt_miscdev = -{ - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &sc1200wdt_fops, -}; - - -static int __init sc1200wdt_probe(void) -{ - /* The probe works by reading the PMC3 register's default value of 0x0e - * there is one caveat, if the device disables the parallel port or any - * of the UARTs we won't be able to detect it. - * Nb. This could be done with accuracy by reading the SID registers, but - * we don't have access to those io regions. - */ - - unsigned char reg; - - sc1200wdt_read_data(PMC3, ®); - reg &= 0x0f; /* we don't want the UART busy bits */ - return (reg == 0x0e) ? 0 : -ENODEV; -} - - -#if defined CONFIG_PNP - -static struct pnp_device_id scl200wdt_pnp_devices[] = { - /* National Semiconductor PC87307/PC97307 watchdog component */ - {.id = "NSC0800", .driver_data = 0}, - {.id = ""}, -}; - -static int scl200wdt_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id) -{ - /* this driver only supports one card at a time */ - if (wdt_dev || !isapnp) - return -EBUSY; - - wdt_dev = dev; - io = pnp_port_start(wdt_dev, 0); - io_len = pnp_port_len(wdt_dev, 0); - - if (!request_region(io, io_len, SC1200_MODULE_NAME)) { - printk(KERN_ERR PFX "Unable to register IO port %#x\n", io); - return -EBUSY; - } - - printk(KERN_INFO "scl200wdt: PnP device found at io port %#x/%d\n", io, io_len); - return 0; -} - -static void scl200wdt_pnp_remove(struct pnp_dev * dev) -{ - if (wdt_dev){ - release_region(io, io_len); - wdt_dev = NULL; - } -} - -static struct pnp_driver scl200wdt_pnp_driver = { - .name = "scl200wdt", - .id_table = scl200wdt_pnp_devices, - .probe = scl200wdt_pnp_probe, - .remove = scl200wdt_pnp_remove, -}; - -#endif /* CONFIG_PNP */ - - -static int __init sc1200wdt_init(void) -{ - int ret; - - printk("%s\n", banner); - - spin_lock_init(&sc1200wdt_lock); - sema_init(&open_sem, 1); - -#if defined CONFIG_PNP - if (isapnp) { - ret = pnp_register_driver(&scl200wdt_pnp_driver); - if (ret) - goto out_clean; - } -#endif - - if (io == -1) { - printk(KERN_ERR PFX "io parameter must be specified\n"); - ret = -EINVAL; - goto out_pnp; - } - -#if defined CONFIG_PNP - /* now that the user has specified an IO port and we haven't detected - * any devices, disable pnp support */ - isapnp = 0; - pnp_unregister_driver(&scl200wdt_pnp_driver); -#endif - - if (!request_region(io, io_len, SC1200_MODULE_NAME)) { - printk(KERN_ERR PFX "Unable to register IO port %#x\n", io); - ret = -EBUSY; - goto out_pnp; - } - - ret = sc1200wdt_probe(); - if (ret) - goto out_io; - - ret = register_reboot_notifier(&sc1200wdt_notifier); - if (ret) { - printk(KERN_ERR PFX "Unable to register reboot notifier err = %d\n", ret); - goto out_io; - } - - ret = misc_register(&sc1200wdt_miscdev); - if (ret) { - printk(KERN_ERR PFX "Unable to register miscdev on minor %d\n", WATCHDOG_MINOR); - goto out_rbt; - } - - /* ret = 0 */ - -out_clean: - return ret; - -out_rbt: - unregister_reboot_notifier(&sc1200wdt_notifier); - -out_io: - release_region(io, io_len); - -out_pnp: -#if defined CONFIG_PNP - if (isapnp) - pnp_unregister_driver(&scl200wdt_pnp_driver); -#endif - goto out_clean; -} - - -static void __exit sc1200wdt_exit(void) -{ - misc_deregister(&sc1200wdt_miscdev); - unregister_reboot_notifier(&sc1200wdt_notifier); - -#if defined CONFIG_PNP - if(isapnp) - pnp_unregister_driver(&scl200wdt_pnp_driver); - else -#endif - release_region(io, io_len); -} - -module_init(sc1200wdt_init); -module_exit(sc1200wdt_exit); - -MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>"); -MODULE_DESCRIPTION("Driver for National Semiconductor PC87307/PC97307 watchdog component"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |