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path: root/drivers/char/watchdog/pc87413_wdt.c
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Diffstat (limited to 'drivers/char/watchdog/pc87413_wdt.c')
-rw-r--r--drivers/char/watchdog/pc87413_wdt.c635
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 3d3deae0d64..00000000000
--- 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) ")");
-