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Diffstat (limited to 'drivers/char/watchdog/smsc37b787_wdt.c')
-rw-r--r--drivers/char/watchdog/smsc37b787_wdt.c627
1 files changed, 0 insertions, 627 deletions
diff --git a/drivers/char/watchdog/smsc37b787_wdt.c b/drivers/char/watchdog/smsc37b787_wdt.c
deleted file mode 100644
index d3cb0a76602..00000000000
--- a/drivers/char/watchdog/smsc37b787_wdt.c
+++ /dev/null
@@ -1,627 +0,0 @@
-/*
- * SMsC 37B787 Watchdog Timer driver for Linux 2.6.x.x
- *
- * Based on acquirewdt.c by Alan Cox <alan@redhat.com>
- * and some other existing drivers
- *
- * 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 authors do NOT admit liability nor provide warranty for
- * any of this software. This material is provided "AS-IS" in
- * the hope that it may be useful for others.
- *
- * (C) Copyright 2003-2006 Sven Anders <anders@anduras.de>
- *
- * History:
- * 2003 - Created version 1.0 for Linux 2.4.x.
- * 2006 - Ported to Linux 2.6, added nowayout and MAGICCLOSE
- * features. Released version 1.1
- *
- * Theory of operation:
- *
- * A Watchdog Timer (WDT) is a hardware circuit that can
- * reset the computer system in case of a software fault.
- * You probably knew that already.
- *
- * Usually a userspace daemon will notify the kernel WDT driver
- * via the /dev/watchdog special device file that userspace is
- * still alive, at regular intervals. When such a notification
- * occurs, the driver will usually tell the hardware watchdog
- * that everything is in order, and that the watchdog should wait
- * for yet another little while to reset the system.
- * If userspace fails (RAM error, kernel bug, whatever), the
- * notifications cease to occur, and the hardware watchdog will
- * reset the system (causing a reboot) after the timeout occurs.
- *
- * Create device with:
- * mknod /dev/watchdog c 10 130
- *
- * For an example userspace keep-alive daemon, see:
- * Documentation/watchdog/watchdog.txt
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/delay.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 <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-
-/* enable support for minutes as units? */
-/* (does not always work correctly, so disabled by default!) */
-#define SMSC_SUPPORT_MINUTES
-#undef SMSC_SUPPORT_MINUTES
-
-#define MAX_TIMEOUT 255
-
-#define UNIT_SECOND 0
-#define UNIT_MINUTE 1
-
-#define MODNAME "smsc37b787_wdt: "
-#define VERSION "1.1"
-
-#define IOPORT 0x3F0
-#define IOPORT_SIZE 2
-#define IODEV_NO 8
-
-static int unit = UNIT_SECOND; /* timer's unit */
-static int timeout = 60; /* timeout value: default is 60 "units" */
-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 ----------------------------------------*/
-
-/* unlock the IO chip */
-
-static inline void open_io_config(void)
-{
- outb(0x55, IOPORT);
- mdelay(1);
- outb(0x55, IOPORT);
-}
-
-/* lock the IO chip */
-static inline void close_io_config(void)
-{
- outb(0xAA, IOPORT);
-}
-
-/* select the IO device */
-static inline void select_io_device(unsigned char devno)
-{
- outb(0x07, IOPORT);
- outb(devno, IOPORT+1);
-}
-
-/* write to the control register */
-static inline void write_io_cr(unsigned char reg, unsigned char data)
-{
- outb(reg, IOPORT);
- outb(data, IOPORT+1);
-}
-
-/* read from the control register */
-static inline char read_io_cr(unsigned char reg)
-{
- outb(reg, IOPORT);
- return inb(IOPORT+1);
-}
-
-/* -- Medium level functions ------------------------------------*/
-
-static inline void gpio_bit12(unsigned char reg)
-{
- // -- General Purpose I/O Bit 1.2 --
- // Bit 0, In/Out: 0 = Output, 1 = Input
- // Bit 1, Polarity: 0 = No Invert, 1 = Invert
- // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable
- // Bit 3/4, Function select: 00 = GPI/O, 01 = WDT, 10 = P17,
- // 11 = Either Edge Triggered Intr. 2
- // Bit 5/6 (Reserved)
- // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
- write_io_cr(0xE2, reg);
-}
-
-static inline void gpio_bit13(unsigned char reg)
-{
- // -- General Purpose I/O Bit 1.3 --
- // Bit 0, In/Out: 0 = Output, 1 = Input
- // Bit 1, Polarity: 0 = No Invert, 1 = Invert
- // Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable
- // Bit 3, Function select: 0 = GPI/O, 1 = LED
- // Bit 4-6 (Reserved)
- // Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
- write_io_cr(0xE3, reg);
-}
-
-static inline void wdt_timer_units(unsigned char new_units)
-{
- // -- Watchdog timer units --
- // Bit 0-6 (Reserved)
- // Bit 7, WDT Time-out Value Units Select
- // (0 = Minutes, 1 = Seconds)
- write_io_cr(0xF1, new_units);
-}
-
-static inline void wdt_timeout_value(unsigned char new_timeout)
-{
- // -- Watchdog Timer Time-out Value --
- // Bit 0-7 Binary coded units (0=Disabled, 1..255)
- write_io_cr(0xF2, new_timeout);
-}
-
-static inline void wdt_timer_conf(unsigned char conf)
-{
- // -- Watchdog timer configuration --
- // Bit 0 Joystick enable: 0* = No Reset, 1 = Reset WDT upon Gameport I/O
- // Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
- // Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr.
- // Bit 3 Reset the timer
- // (Wrong in SMsC documentation? Given as: PowerLED Timout Enabled)
- // Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
- // 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
- write_io_cr(0xF3, conf);
-}
-
-static inline void wdt_timer_ctrl(unsigned char reg)
-{
- // -- Watchdog timer control --
- // Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured
- // Bit 1 Power LED Toggle: 0 = Disable Toggle, 1 = Toggle at 1 Hz
- // Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
- // Bit 3 P20 Force Timeout enabled:
- // 0 = P20 activity does not generate the WD timeout event
- // 1 = P20 Allows rising edge of P20, from the keyboard
- // controller, to force the WD timeout event.
- // Bit 4 (Reserved)
- // -- Soft power management --
- // Bit 5 Stop Counter: 1 = Stop software power down counter
- // set via register 0xB8, (self-cleaning)
- // (Upon read: 0 = Counter running, 1 = Counter stopped)
- // Bit 6 Restart Counter: 1 = Restart software power down counter
- // set via register 0xB8, (self-cleaning)
- // Bit 7 SPOFF: 1 = Force software power down (self-cleaning)
-
- write_io_cr(0xF4, reg);
-}
-
-/* -- Higher level functions ------------------------------------*/
-
-/* initialize watchdog */
-
-static void wb_smsc_wdt_initialize(void)
-{
- unsigned char old;
-
- spin_lock(&io_lock);
- open_io_config();
- select_io_device(IODEV_NO);
-
- // enable the watchdog
- gpio_bit13(0x08); // Select pin 80 = LED not GPIO
- gpio_bit12(0x0A); // Set pin 79 = WDT not GPIO/Output/Polarity=Invert
-
- // disable the timeout
- wdt_timeout_value(0);
-
- // reset control register
- wdt_timer_ctrl(0x00);
-
- // reset configuration register
- wdt_timer_conf(0x00);
-
- // read old (timer units) register
- old = read_io_cr(0xF1) & 0x7F;
- if (unit == UNIT_SECOND) old |= 0x80; // set to seconds
-
- // set the watchdog timer units
- wdt_timer_units(old);
-
- close_io_config();
- spin_unlock(&io_lock);
-}
-
-/* shutdown the watchdog */
-
-static void wb_smsc_wdt_shutdown(void)
-{
- spin_lock(&io_lock);
- open_io_config();
- select_io_device(IODEV_NO);
-
- // disable the watchdog
- gpio_bit13(0x09);
- gpio_bit12(0x09);
-
- // reset watchdog config register
- wdt_timer_conf(0x00);
-
- // reset watchdog control register
- wdt_timer_ctrl(0x00);
-
- // disable timeout
- wdt_timeout_value(0x00);
-
- close_io_config();
- spin_unlock(&io_lock);
-}
-
-/* set timeout => enable watchdog */
-
-static void wb_smsc_wdt_set_timeout(unsigned char new_timeout)
-{
- spin_lock(&io_lock);
- open_io_config();
- select_io_device(IODEV_NO);
-
- // set Power LED to blink, if we enable the timeout
- wdt_timer_ctrl((new_timeout == 0) ? 0x00 : 0x02);
-
- // set timeout value
- wdt_timeout_value(new_timeout);
-
- close_io_config();
- spin_unlock(&io_lock);
-}
-
-/* get timeout */
-
-static unsigned char wb_smsc_wdt_get_timeout(void)
-{
- unsigned char set_timeout;
-
- spin_lock(&io_lock);
- open_io_config();
- select_io_device(IODEV_NO);
- set_timeout = read_io_cr(0xF2);
- close_io_config();
- spin_unlock(&io_lock);
-
- return set_timeout;
-}
-
-/* disable watchdog */
-
-static void wb_smsc_wdt_disable(void)
-{
- // set the timeout to 0 to disable the watchdog
- wb_smsc_wdt_set_timeout(0);
-}
-
-/* enable watchdog by setting the current timeout */
-
-static void wb_smsc_wdt_enable(void)
-{
- // set the current timeout...
- wb_smsc_wdt_set_timeout(timeout);
-}
-
-/* reset the timer */
-
-static void wb_smsc_wdt_reset_timer(void)
-{
- spin_lock(&io_lock);
- open_io_config();
- select_io_device(IODEV_NO);
-
- // reset the timer
- wdt_timeout_value(timeout);
- wdt_timer_conf(0x08);
-
- close_io_config();
- spin_unlock(&io_lock);
-}
-
-/* return, if the watchdog is enabled (timeout is set...) */
-
-static int wb_smsc_wdt_status(void)
-{
- return (wb_smsc_wdt_get_timeout() == 0) ? 0 : WDIOF_KEEPALIVEPING;
-}
-
-
-/* -- File operations -------------------------------------------*/
-
-/* open => enable watchdog and set initial timeout */
-
-static int wb_smsc_wdt_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 */
- wb_smsc_wdt_enable();
-
- printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
-
- return nonseekable_open(inode, file);
-}
-
-/* close => shut off the timer */
-
-static int wb_smsc_wdt_release(struct inode *inode, struct file *file)
-{
- /* Shut off the timer. */
-
- if (expect_close == 42) {
- wb_smsc_wdt_disable();
- printk(KERN_INFO MODNAME "Watchdog disabled, sleeping again...\n");
- } else {
- printk(KERN_CRIT MODNAME "Unexpected close, not stopping watchdog!\n");
- wb_smsc_wdt_reset_timer();
- }
-
- clear_bit(0, &timer_enabled);
- expect_close = 0;
- return 0;
-}
-
-/* write => update the timer to keep the machine alive */
-
-static ssize_t wb_smsc_wdt_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 */
- wb_smsc_wdt_reset_timer();
- }
- return len;
-}
-
-/* ioctl => control interface */
-
-static int wb_smsc_wdt_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 = 0,
- .identity = "SMsC 37B787 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(wb_smsc_wdt_status(), uarg.i);
-
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, uarg.i);
-
- case WDIOC_KEEPALIVE:
- wb_smsc_wdt_reset_timer();
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, uarg.i))
- return -EFAULT;
-
- // the API states this is given in secs
- if (unit == UNIT_MINUTE)
- new_timeout /= 60;
-
- if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
- return -EINVAL;
-
- timeout = new_timeout;
- wb_smsc_wdt_set_timeout(timeout);
-
- // fall through and return the new timeout...
-
- case WDIOC_GETTIMEOUT:
-
- new_timeout = timeout;
-
- if (unit == UNIT_MINUTE)
- new_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) {
- wb_smsc_wdt_disable();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- wb_smsc_wdt_enable();
- retval = 0;
- }
-
- return retval;
- }
- }
-}
-
-/* -- Notifier funtions -----------------------------------------*/
-
-static int wb_smsc_wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
-{
- if (code == SYS_DOWN || code == SYS_HALT)
- {
- // set timeout to 0, to avoid possible race-condition
- timeout = 0;
- wb_smsc_wdt_disable();
- }
- return NOTIFY_DONE;
-}
-
-/* -- Module's structures ---------------------------------------*/
-
-static const struct file_operations wb_smsc_wdt_fops =
-{
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = wb_smsc_wdt_write,
- .ioctl = wb_smsc_wdt_ioctl,
- .open = wb_smsc_wdt_open,
- .release = wb_smsc_wdt_release,
-};
-
-static struct notifier_block wb_smsc_wdt_notifier =
-{
- .notifier_call = wb_smsc_wdt_notify_sys,
-};
-
-static struct miscdevice wb_smsc_wdt_miscdev =
-{
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &wb_smsc_wdt_fops,
-};
-
-/* -- Module init functions -------------------------------------*/
-
-/* module's "constructor" */
-
-static int __init wb_smsc_wdt_init(void)
-{
- int ret;
-
- spin_lock_init(&io_lock);
-
- printk("SMsC 37B787 watchdog component driver " VERSION " initialising...\n");
-
- if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) {
- printk(KERN_ERR MODNAME "Unable to register IO port %#x\n", IOPORT);
- ret = -EBUSY;
- goto out_pnp;
- }
-
- // set new maximum, if it's too big
- if (timeout > MAX_TIMEOUT)
- timeout = MAX_TIMEOUT;
-
- // init the watchdog timer
- wb_smsc_wdt_initialize();
-
- ret = register_reboot_notifier(&wb_smsc_wdt_notifier);
- if (ret) {
- printk(KERN_ERR MODNAME "Unable to register reboot notifier err = %d\n", ret);
- goto out_io;
- }
-
- ret = misc_register(&wb_smsc_wdt_miscdev);
- if (ret) {
- printk(KERN_ERR MODNAME "Unable to register miscdev on minor %d\n", WATCHDOG_MINOR);
- goto out_rbt;
- }
-
- // output info
- printk(KERN_INFO MODNAME "Timeout set to %d %s.\n", timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
- printk(KERN_INFO MODNAME "Watchdog initialized and sleeping (nowayout=%d)...\n", nowayout);
-
- // ret = 0
-
-out_clean:
- return ret;
-
-out_rbt:
- unregister_reboot_notifier(&wb_smsc_wdt_notifier);
-
-out_io:
- release_region(IOPORT, IOPORT_SIZE);
-
-out_pnp:
- goto out_clean;
-}
-
-/* module's "destructor" */
-
-static void __exit wb_smsc_wdt_exit(void)
-{
- /* Stop the timer before we leave */
- if (!nowayout)
- {
- wb_smsc_wdt_shutdown();
- printk(KERN_INFO MODNAME "Watchdog disabled.\n");
- }
-
- misc_deregister(&wb_smsc_wdt_miscdev);
- unregister_reboot_notifier(&wb_smsc_wdt_notifier);
- release_region(IOPORT, IOPORT_SIZE);
-
- printk("SMsC 37B787 watchdog component driver removed.\n");
-}
-
-module_init(wb_smsc_wdt_init);
-module_exit(wb_smsc_wdt_exit);
-
-MODULE_AUTHOR("Sven Anders <anders@anduras.de>");
-MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version " VERSION ")");
-MODULE_LICENSE("GPL");
-
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
-
-#ifdef SMSC_SUPPORT_MINUTES
-module_param(unit, int, 0);
-MODULE_PARM_DESC(unit, "set unit to use, 0=seconds or 1=minutes, default is 0");
-#endif
-
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "range is 1-255 units, default is 60");
-
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-22 06:06:18 +0000