diff options
Diffstat (limited to 'drivers/char/watchdog/pc87413_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/pc87413_wdt.c | 635 |
1 files changed, 0 insertions, 635 deletions
diff --git a/drivers/char/watchdog/pc87413_wdt.c b/drivers/char/watchdog/pc87413_wdt.c deleted file mode 100644 index 3d3deae0d64b..000000000000 --- a/drivers/char/watchdog/pc87413_wdt.c +++ /dev/null @@ -1,635 +0,0 @@ -/* - * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x - * - * This code is based on wdt.c with original copyright. - * - * (C) Copyright 2006 Sven Anders, <anders@anduras.de> - * and Marcus Junker, <junker@anduras.de> - * - * 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 Sven Anders, 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. - * - * Release 1.1 - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/ioport.h> -#include <linux/delay.h> -#include <linux/notifier.h> -#include <linux/fs.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/moduleparam.h> -#include <linux/version.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -/* #define DEBUG 1 */ - -#define DEFAULT_TIMEOUT 1 /* 1 minute */ -#define MAX_TIMEOUT 255 - -#define VERSION "1.1" -#define MODNAME "pc87413 WDT" -#define PFX MODNAME ": " -#define DPFX MODNAME " - DEBUG: " - -#define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ -#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) -#define SWC_LDN 0x04 -#define SIOCFG2 0x22 /* Serial IO register */ -#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */ -#define WDTO 0x11 /* Watchdog timeout register */ -#define WDCFG 0x12 /* Watchdog config register */ - -static int io = 0x2E; /* Address used on Portwell Boards */ - -static int timeout = DEFAULT_TIMEOUT; /* timeout value */ -static unsigned long timer_enabled = 0; /* is the timer enabled? */ - -static char expect_close; /* is the close expected? */ - -static spinlock_t io_lock; /* to guard the watchdog from io races */ - -static int nowayout = WATCHDOG_NOWAYOUT; - -/* -- Low level function ----------------------------------------*/ - -/* Select pins for Watchdog output */ - -static inline void pc87413_select_wdt_out (void) -{ - unsigned int cr_data = 0; - - /* Step 1: Select multiple pin,pin55,as WDT output */ - - outb_p(SIOCFG2, WDT_INDEX_IO_PORT); - - cr_data = inb (WDT_DATA_IO_PORT); - - cr_data |= 0x80; /* Set Bit7 to 1*/ - outb_p(SIOCFG2, WDT_INDEX_IO_PORT); - - outb_p(cr_data, WDT_DATA_IO_PORT); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:" - " Bit7 to 1: %d\n", cr_data); -#endif -} - -/* Enable SWC functions */ - -static inline void pc87413_enable_swc(void) -{ - unsigned int cr_data=0; - - /* Step 2: Enable SWC functions */ - - outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ - outb_p(SWC_LDN, WDT_DATA_IO_PORT); - - outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ - cr_data = inb(WDT_DATA_IO_PORT); - cr_data |= 0x01; /* Set Bit0 to 1 */ - outb_p(0x30, WDT_INDEX_IO_PORT); - outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ - -#ifdef DEBUG - printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); -#endif -} - -/* Read SWC I/O base address */ - -static inline unsigned int pc87413_get_swc_base(void) -{ - unsigned int swc_base_addr = 0; - unsigned char addr_l, addr_h = 0; - - /* Step 3: Read SWC I/O Base Address */ - - outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ - addr_h = inb(WDT_DATA_IO_PORT); - - outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ - - addr_l = inb(WDT_DATA_IO_PORT); - - swc_base_addr = (addr_h << 8) + addr_l; - -#ifdef DEBUG - printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d," - " res %d\n", addr_l, addr_h, swc_base_addr); -#endif - - return swc_base_addr; -} - -/* Select Bank 3 of SWC */ - -static inline void pc87413_swc_bank3(unsigned int swc_base_addr) -{ - /* Step 4: Select Bank3 of SWC */ - - outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); -#endif -} - -/* Set watchdog timeout to x minutes */ - -static inline void pc87413_programm_wdto(unsigned int swc_base_addr, - char pc87413_time) -{ - /* Step 5: Programm WDTO, Twd. */ - - outb_p(pc87413_time, swc_base_addr + WDTO); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); -#endif -} - -/* Enable WDEN */ - -static inline void pc87413_enable_wden(unsigned int swc_base_addr) -{ - /* Step 6: Enable WDEN */ - - outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Enable WDEN\n"); -#endif -} - -/* Enable SW_WD_TREN */ -static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) -{ - /* Enable SW_WD_TREN */ - - outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); -#endif -} - -/* Disable SW_WD_TREN */ - -static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) -{ - /* Disable SW_WD_TREN */ - - outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); - -#ifdef DEBUG - printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); -#endif -} - -/* Enable SW_WD_TRG */ - -static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) -{ - /* Enable SW_WD_TRG */ - - outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); - -#ifdef DEBUG - printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); -#endif -} - -/* Disable SW_WD_TRG */ - -static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) -{ - /* Disable SW_WD_TRG */ - - outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); - -#ifdef DEBUG - printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); -#endif -} - -/* -- Higher level functions ------------------------------------*/ - -/* Enable the watchdog */ - -static void pc87413_enable(void) -{ - unsigned int swc_base_addr; - - spin_lock(&io_lock); - - pc87413_select_wdt_out(); - pc87413_enable_swc(); - swc_base_addr = pc87413_get_swc_base(); - pc87413_swc_bank3(swc_base_addr); - pc87413_programm_wdto(swc_base_addr, timeout); - pc87413_enable_wden(swc_base_addr); - pc87413_enable_sw_wd_tren(swc_base_addr); - pc87413_enable_sw_wd_trg(swc_base_addr); - - spin_unlock(&io_lock); -} - -/* Disable the watchdog */ - -static void pc87413_disable(void) -{ - unsigned int swc_base_addr; - - spin_lock(&io_lock); - - pc87413_select_wdt_out(); - pc87413_enable_swc(); - swc_base_addr = pc87413_get_swc_base(); - pc87413_swc_bank3(swc_base_addr); - pc87413_disable_sw_wd_tren(swc_base_addr); - pc87413_disable_sw_wd_trg(swc_base_addr); - pc87413_programm_wdto(swc_base_addr, 0); - - spin_unlock(&io_lock); -} - -/* Refresh the watchdog */ - -static void pc87413_refresh(void) -{ - unsigned int swc_base_addr; - - spin_lock(&io_lock); - - pc87413_select_wdt_out(); - pc87413_enable_swc(); - swc_base_addr = pc87413_get_swc_base(); - pc87413_swc_bank3(swc_base_addr); - pc87413_disable_sw_wd_tren(swc_base_addr); - pc87413_disable_sw_wd_trg(swc_base_addr); - pc87413_programm_wdto(swc_base_addr, timeout); - pc87413_enable_wden(swc_base_addr); - pc87413_enable_sw_wd_tren(swc_base_addr); - pc87413_enable_sw_wd_trg(swc_base_addr); - - spin_unlock(&io_lock); -} - -/* -- File operations -------------------------------------------*/ - -/** - * pc87413_open: - * @inode: inode of device - * @file: file handle to device - * - */ - -static int pc87413_open(struct inode *inode, struct file *file) -{ - /* /dev/watchdog can only be opened once */ - - if (test_and_set_bit(0, &timer_enabled)) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - /* Reload and activate timer */ - pc87413_refresh(); - - printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to" - " %d minute(s).\n", timeout); - - return nonseekable_open(inode, file); -} - -/** - * pc87413_release: - * @inode: inode to board - * @file: file handle to board - * - * The watchdog has a configurable API. There is a religious dispute - * between people who want their watchdog to be able to shut down and - * those who want to be sure if the watchdog manager dies the machine - * reboots. In the former case we disable the counters, in the latter - * case you have to open it again very soon. - */ - -static int pc87413_release(struct inode *inode, struct file *file) -{ - /* Shut off the timer. */ - - if (expect_close == 42) { - pc87413_disable(); - printk(KERN_INFO MODNAME "Watchdog disabled," - " sleeping again...\n"); - } else { - printk(KERN_CRIT MODNAME "Unexpected close, not stopping" - " watchdog!\n"); - pc87413_refresh(); - } - - clear_bit(0, &timer_enabled); - expect_close = 0; - - return 0; -} - -/** - * pc87413_status: - * - * return, if the watchdog is enabled (timeout is set...) - */ - - -static int pc87413_status(void) -{ - return 0; /* currently not supported */ -} - -/** - * pc87413_write: - * @file: file handle to the watchdog - * @data: data buffer to write - * @len: length in bytes - * @ppos: pointer to the position to write. No seeks allowed - * - * A write to a watchdog device is defined as a keepalive signal. Any - * write of data will do, as we we don't define content meaning. - */ - -static ssize_t pc87413_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* See if we got the magic character 'V' and reload the timer */ - if (len) { - if (!nowayout) { - size_t i; - - /* reset expect flag */ - expect_close = 0; - - /* scan to see whether or not we got the magic character */ - for (i = 0; i != len; i++) { - char c; - if (get_user(c, data+i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - - /* someone wrote to us, we should reload the timer */ - pc87413_refresh(); - } - return len; -} - -/** - * pc87413_ioctl: - * @inode: inode of the device - * @file: file handle to the device - * @cmd: watchdog command - * @arg: argument pointer - * - * The watchdog API defines a common set of functions for all watchdogs - * according to their available features. We only actually usefully support - * querying capabilities and current status. - */ - -static int pc87413_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int new_timeout; - - union { - struct watchdog_info __user *ident; - int __user *i; - } uarg; - - static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING | - WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "PC87413(HF/F) watchdog" - }; - - uarg.i = (int __user *)arg; - - switch(cmd) { - default: - return -ENOTTY; - - case WDIOC_GETSUPPORT: - return copy_to_user(uarg.ident, &ident, - sizeof(ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - return put_user(pc87413_status(), uarg.i); - - case WDIOC_GETBOOTSTATUS: - return put_user(0, uarg.i); - - case WDIOC_KEEPALIVE: - pc87413_refresh(); -#ifdef DEBUG - printk(KERN_INFO DPFX "keepalive\n"); -#endif - return 0; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, uarg.i)) - 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; - pc87413_refresh(); - - // fall through and return the new timeout... - - case WDIOC_GETTIMEOUT: - - new_timeout = timeout * 60; - - return put_user(new_timeout, uarg.i); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, uarg.i)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - pc87413_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - pc87413_enable(); - retval = 0; - } - - return retval; - } - } -} - -/* -- Notifier funtions -----------------------------------------*/ - -/** - * notify_sys: - * @this: our notifier block - * @code: the event being reported - * @unused: unused - * - * Our notifier is called on system shutdowns. We want to turn the card - * off at reboot otherwise the machine will reboot again during memory - * test or worse yet during the following fsck. This would suck, in fact - * trust me - if it happens it does suck. - */ - -static int pc87413_notify_sys(struct notifier_block *this, - unsigned long code, - void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) - { - /* Turn the card off */ - pc87413_disable(); - } - return NOTIFY_DONE; -} - -/* -- Module's structures ---------------------------------------*/ - -static const struct file_operations pc87413_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = pc87413_write, - .ioctl = pc87413_ioctl, - .open = pc87413_open, - .release = pc87413_release, -}; - -static struct notifier_block pc87413_notifier = -{ - .notifier_call = pc87413_notify_sys, -}; - -static struct miscdevice pc87413_miscdev= -{ - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &pc87413_fops -}; - -/* -- Module init functions -------------------------------------*/ - -/** - * pc87413_init: module's "constructor" - * - * Set up the WDT watchdog board. All we have to do is grab the - * resources we require and bitch if anyone beat us to them. - * The open() function will actually kick the board off. - */ - -static int __init pc87413_init(void) -{ - int ret; - - spin_lock_init(&io_lock); - - printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT); - - /* request_region(io, 2, "pc87413"); */ - - ret = register_reboot_notifier(&pc87413_notifier); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - } - - ret = misc_register(&pc87413_miscdev); - - if (ret != 0) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - unregister_reboot_notifier(&pc87413_notifier); - return ret; - } - - printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout); - - pc87413_enable(); - - return 0; -} - -/** - * pc87413_exit: module's "destructor" - * - * Unload the watchdog. You cannot do this with any file handles open. - * If your watchdog is set to continue ticking on close and you unload - * it, well it keeps ticking. We won't get the interrupt but the board - * will not touch PC memory so all is fine. You just have to load a new - * module in 60 seconds or reboot. - */ - -static void __exit pc87413_exit(void) -{ - /* Stop the timer before we leave */ - if (!nowayout) - { - pc87413_disable(); - printk(KERN_INFO MODNAME "Watchdog disabled.\n"); - } - - misc_deregister(&pc87413_miscdev); - unregister_reboot_notifier(&pc87413_notifier); - /* release_region(io,2); */ - - printk(MODNAME " watchdog component driver removed.\n"); -} - -module_init(pc87413_init); -module_exit(pc87413_exit); - -MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,"); -MODULE_DESCRIPTION("PC87413 WDT driver"); -MODULE_LICENSE("GPL"); - -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -module_param(io, int, 0); -MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ")."); - -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ")."); - -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - |