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Merge master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog 

* master.kernel.org:/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  [WATCHDOG] at91_wdt.c - Atmel AT91RM9200 watchdog driver
  [WATCHDOG] pcwd_usb.c: fix a NULL pointer dereference
  [WATCHDOG] pcwd.c sprintf/strcpy fix
  [WATCHDOG] pcwd.c general clean-up after patches
  [WATCHDOG] pcwd.c add debug info
  [WATCHDOG] pcwd.c pcwd_cleanup_module patch
  [WATCHDOG] pcwd.c firmware-info patch
  [WATCHDOG] pcwd.c control status patch
This commit is contained in:
Linus Torvalds 2006-04-02 13:01:11 -07:00
parent 63589ed078 853807fb50
commit 7f344f0aa7
5 changed files with 340 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/char/watchdog/Kconfig
View File

@ -60,6 +60,13 @@ config SOFT_WATCHDOG
# ARM Architecture
config AT91_WATCHDOG
tristate "AT91RM9200 watchdog"
depends on WATCHDOG && ARCH_AT91RM9200
help
Watchdog timer embedded into AT91RM9200 chips. This will reboot your
system when the timeout is reached.
config 21285_WATCHDOG
tristate "DC21285 watchdog"
depends on WATCHDOG && FOOTBRIDGE

1
drivers/char/watchdog/Makefile
View File

@ -23,6 +23,7 @@ obj-$(CONFIG_WDTPCI) += wdt_pci.o
obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
# ARM Architecture
obj-$(CONFIG_AT91_WATCHDOG) += at91_wdt.o
obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
obj-$(CONFIG_977_WATCHDOG) += wdt977.o
obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o

228
drivers/char/watchdog/at91_wdt.c Normal file
View File

@ -0,0 +1,228 @@
/*
* Watchdog driver for Atmel AT91RM9200 (Thunder)
*
* Copyright (C) 2003 SAN People (Pty) Ltd
*
* 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.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#define WDT_DEFAULT_TIME 5 /* 5 seconds */
#define WDT_MAX_TIME 256 /* 256 seconds */
static int wdt_time = WDT_DEFAULT_TIME;
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(wdt_time, int, 0);
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="__MODULE_STRING(WDT_DEFAULT_TIME) ")");
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static unsigned long at91wdt_busy;
/* ......................................................................... */
/*
* Disable the watchdog.
*/
static void inline at91_wdt_stop(void)
{
at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN);
}
/*
* Enable and reset the watchdog.
*/
static void inline at91_wdt_start(void)
{
at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN | (((65536 * wdt_time) >> 8) & AT91_ST_WDV));
at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
}
/*
* Reload the watchdog timer. (ie, pat the watchdog)
*/
static void inline at91_wdt_reload(void)
{
at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
}
/* ......................................................................... */
/*
* Watchdog device is opened, and watchdog starts running.
*/
static int at91_wdt_open(struct inode *inode, struct file *file)
{
if (test_and_set_bit(0, &at91wdt_busy))
return -EBUSY;
at91_wdt_start();
return nonseekable_open(inode, file);
}
/*
* Close the watchdog device.
* If CONFIG_WATCHDOG_NOWAYOUT is NOT defined then the watchdog is also
* disabled.
*/
static int at91_wdt_close(struct inode *inode, struct file *file)
{
if (!nowayout)
at91_wdt_stop(); /* Disable the watchdog when file is closed */
clear_bit(0, &at91wdt_busy);
return 0;
}
/*
* Change the watchdog time interval.
*/
static int at91_wdt_settimeout(int new_time)
{
/*
* All counting occurs at SLOW_CLOCK / 128 = 0.256 Hz
*
* Since WDV is a 16-bit counter, the maximum period is
* 65536 / 0.256 = 256 seconds.
*/
if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
return -EINVAL;
/* Set new watchdog time. It will be used when at91_wdt_start() is called. */
wdt_time = new_time;
return 0;
}
static struct watchdog_info at91_wdt_info = {
.identity = "at91 watchdog",
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
};
/*
* Handle commands from user-space.
*/
static int at91_wdt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
int __user *p = argp;
int new_value;
switch(cmd) {
case WDIOC_KEEPALIVE:
at91_wdt_reload(); /* pat the watchdog */
return 0;
case WDIOC_GETSUPPORT:
return copy_to_user(argp, &at91_wdt_info, sizeof(at91_wdt_info)) ? -EFAULT : 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_value, p))
return -EFAULT;
if (at91_wdt_settimeout(new_value))
return -EINVAL;
/* Enable new time value */
at91_wdt_start();
/* Return current value */
return put_user(wdt_time, p);
case WDIOC_GETTIMEOUT:
return put_user(wdt_time, p);
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0, p);
case WDIOC_SETOPTIONS:
if (get_user(new_value, p))
return -EFAULT;
if (new_value & WDIOS_DISABLECARD)
at91_wdt_stop();
if (new_value & WDIOS_ENABLECARD)
at91_wdt_start();
return 0;
default:
return -ENOIOCTLCMD;
}
}
/*
* Pat the watchdog whenever device is written to.
*/
static ssize_t at91_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
{
at91_wdt_reload(); /* pat the watchdog */
return len;
}
/* ......................................................................... */
static struct file_operations at91wdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = at91_wdt_ioctl,
.open = at91_wdt_open,
.release = at91_wdt_close,
.write = at91_wdt_write,
};
static struct miscdevice at91wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
.fops = &at91wdt_fops,
};
static int __init at91_wdt_init(void)
{
int res;
/* Check that the heartbeat value is within range; if not reset to the default */
if (at91_wdt_settimeout(wdt_time)) {
at91_wdt_settimeout(WDT_DEFAULT_TIME);
printk(KERN_INFO "at91_wdt: wdt_time value must be 1 <= wdt_time <= 256, using %d\n", wdt_time);
}
res = misc_register(&at91wdt_miscdev);
if (res)
return res;
printk("AT91 Watchdog Timer enabled (%d seconds, nowayout=%d)\n", wdt_time, nowayout);
return 0;
}
static void __exit at91_wdt_exit(void)
{
misc_deregister(&at91wdt_miscdev);
}
module_init(at91_wdt_init);
module_exit(at91_wdt_exit);
MODULE_AUTHOR("Andrew Victor");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT91RM9200");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

137
drivers/char/watchdog/pcwd.c
View File

@ -66,15 +66,13 @@
#include <linux/fs.h> /* For file operations */
#include <linux/ioport.h> /* For io-port access */
#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
#include <linux/sched.h> /* TASK_INTERRUPTIBLE, set_current_state() and friends */
#include <linux/slab.h> /* For kmalloc */
#include <asm/uaccess.h> /* For copy_to_user/put_user/... */
#include <asm/io.h> /* For inb/outb/... */
/* Module and version information */
#define WATCHDOG_VERSION "1.16"
#define WATCHDOG_DATE "03 Jan 2006"
#define WATCHDOG_VERSION "1.17"
#define WATCHDOG_DATE "12 Feb 2006"
#define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
#define WATCHDOG_NAME "pcwd"
#define PFX WATCHDOG_NAME ": "
@ -96,15 +94,19 @@
* PCI-PC Watchdog card.
*/
/* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
#define WD_WDRST 0x01 /* Previously reset state */
#define WD_T110 0x02 /* Temperature overheat sense */
#define WD_HRTBT 0x04 /* Heartbeat sense */
#define WD_RLY2 0x08 /* External relay triggered */
#define WD_SRLY2 0x80 /* Software external relay triggered */
#define WD_WDRST 0x01 /* Previously reset state */
#define WD_T110 0x02 /* Temperature overheat sense */
#define WD_HRTBT 0x04 /* Heartbeat sense */
#define WD_RLY2 0x08 /* External relay triggered */
#define WD_SRLY2 0x80 /* Software external relay triggered */
/* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */
#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */
#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
#define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */
#define WD_REVC_RL1A 0x10 /* Relay 1 active */
#define WD_REVC_R2DS 0x40 /* Relay 2 disable */
#define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
/* Port 2 : Control Status #2 */
#define WD_WDIS 0x10 /* Watchdog Disabled */
#define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
@ -122,9 +124,14 @@
#define CMD_ISA_VERSION_HUNDRETH 0x03
#define CMD_ISA_VERSION_MINOR 0x04
#define CMD_ISA_SWITCH_SETTINGS 0x05
#define CMD_ISA_RESET_PC 0x06
#define CMD_ISA_ARM_0 0x07
#define CMD_ISA_ARM_30 0x08
#define CMD_ISA_ARM_60 0x09
#define CMD_ISA_DELAY_TIME_2SECS 0x0A
#define CMD_ISA_DELAY_TIME_4SECS 0x0B
#define CMD_ISA_DELAY_TIME_8SECS 0x0C
#define CMD_ISA_RESET_RELAYS 0x0D
/*
* We are using an kernel timer to do the pinging of the watchdog
@ -142,6 +149,7 @@ static atomic_t open_allowed = ATOMIC_INIT(1);
static char expect_close;
static int temp_panic;
static struct { /* this is private data for each ISA-PC watchdog card */
char fw_ver_str[6]; /* The cards firmware version */
int revision; /* The card's revision */
int supports_temp; /* Wether or not the card has a temperature device */
int command_mode; /* Wether or not the card is in command mode */
@ -153,6 +161,13 @@ static struct { /* this is private data for each ISA-PC watchdog card */
} pcwd_private;
/* module parameters */
#define QUIET 0 /* Default */
#define VERBOSE 1 /* Verbose */
#define DEBUG 2 /* print fancy stuff too */
static int debug = QUIET;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */
static int heartbeat = WATCHDOG_HEARTBEAT;
module_param(heartbeat, int, 0);
@ -172,6 +187,10 @@ static int send_isa_command(int cmd)
int control_status;
int port0, last_port0; /* Double read for stabilising */
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n",
cmd);
/* The WCMD bit must be 1 and the command is only 4 bits in size */
control_status = (cmd & 0x0F) | WD_WCMD;
outb_p(control_status, pcwd_private.io_addr + 2);
@ -188,6 +207,10 @@ static int send_isa_command(int cmd)
udelay (250);
}
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
cmd, port0, last_port0);
return port0;
}
@ -214,6 +237,10 @@ static int set_command_mode(void)
spin_unlock(&pcwd_private.io_lock);
pcwd_private.command_mode = found;
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "command_mode=%d\n",
pcwd_private.command_mode);
return(found);
}
@ -226,6 +253,10 @@ static void unset_command_mode(void)
spin_unlock(&pcwd_private.io_lock);
pcwd_private.command_mode = 0;
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "command_mode=%d\n",
pcwd_private.command_mode);
}
static inline void pcwd_check_temperature_support(void)
@ -234,27 +265,22 @@ static inline void pcwd_check_temperature_support(void)
pcwd_private.supports_temp = 1;
}
static inline char *get_firmware(void)
static inline void pcwd_get_firmware(void)
{
int one, ten, hund, minor;
char *ret;
ret = kmalloc(6, GFP_KERNEL);
if(ret == NULL)
return NULL;
strcpy(pcwd_private.fw_ver_str, "ERROR");
if (set_command_mode()) {
one = send_isa_command(CMD_ISA_VERSION_INTEGER);
ten = send_isa_command(CMD_ISA_VERSION_TENTH);
hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
minor = send_isa_command(CMD_ISA_VERSION_MINOR);
sprintf(ret, "%c.%c%c%c", one, ten, hund, minor);
sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor);
}
else
sprintf(ret, "ERROR");
unset_command_mode();
return(ret);
return;
}
static inline int pcwd_get_option_switches(void)
@ -272,17 +298,15 @@ static inline int pcwd_get_option_switches(void)
static void pcwd_show_card_info(void)
{
char *firmware;
int option_switches;
/* Get some extra info from the hardware (in command/debug/diag mode) */
if (pcwd_private.revision == PCWD_REVISION_A)
printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr);
else if (pcwd_private.revision == PCWD_REVISION_C) {
firmware = get_firmware();
pcwd_get_firmware();
printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
pcwd_private.io_addr, firmware);
kfree(firmware);
pcwd_private.io_addr, pcwd_private.fw_ver_str);
option_switches = pcwd_get_option_switches();
printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
option_switches,
@ -362,6 +386,10 @@ static int pcwd_start(void)
return -EIO;
}
}
if (debug >= VERBOSE)
printk(KERN_DEBUG PFX "Watchdog started\n");
return 0;
}
@ -386,6 +414,10 @@ static int pcwd_stop(void)
return -EIO;
}
}
if (debug >= VERBOSE)
printk(KERN_DEBUG PFX "Watchdog stopped\n");
return 0;
}
@ -393,6 +425,10 @@ static int pcwd_keepalive(void)
{
/* user land ping */
pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
if (debug >= DEBUG)
printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
return 0;
}
@ -402,12 +438,17 @@ static int pcwd_set_heartbeat(int t)
return -EINVAL;
heartbeat = t;
if (debug >= VERBOSE)
printk(KERN_DEBUG PFX "New heartbeat: %d\n",
heartbeat);
return 0;
}
static int pcwd_get_status(int *status)
{
int card_status;
int control_status;
*status=0;
spin_lock(&pcwd_private.io_lock);
@ -415,37 +456,39 @@ static int pcwd_get_status(int *status)
/* Rev A cards return status information from
* the base register, which is used for the
* temperature in other cards. */
card_status = inb(pcwd_private.io_addr);
control_status = inb(pcwd_private.io_addr);
else {
/* Rev C cards return card status in the base
* address + 1 register. And use different bits
* to indicate a card initiated reset, and an
* over-temperature condition. And the reboot
* status can be reset. */
card_status = inb(pcwd_private.io_addr + 1);
control_status = inb(pcwd_private.io_addr + 1);
}
spin_unlock(&pcwd_private.io_lock);
if (pcwd_private.revision == PCWD_REVISION_A) {
if (card_status & WD_WDRST)
if (control_status & WD_WDRST)
*status |= WDIOF_CARDRESET;
if (card_status & WD_T110) {
if (control_status & WD_T110) {
*status |= WDIOF_OVERHEAT;
if (temp_panic) {
printk (KERN_INFO PFX "Temperature overheat trip!\n");
kernel_power_off();
/* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
}
}
} else {
if (card_status & WD_REVC_WTRP)
if (control_status & WD_REVC_WTRP)
*status |= WDIOF_CARDRESET;
if (card_status & WD_REVC_TTRP) {
if (control_status & WD_REVC_TTRP) {
*status |= WDIOF_OVERHEAT;
if (temp_panic) {
printk (KERN_INFO PFX "Temperature overheat trip!\n");
kernel_power_off();
/* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */
}
}
}
@ -455,9 +498,25 @@ static int pcwd_get_status(int *status)
static int pcwd_clear_status(void)
{
int control_status;
if (pcwd_private.revision == PCWD_REVISION_C) {
spin_lock(&pcwd_private.io_lock);
outb_p(0x00, pcwd_private.io_addr + 1); /* clear reset status */
if (debug >= VERBOSE)
printk(KERN_INFO PFX "clearing watchdog trip status\n");
control_status = inb_p(pcwd_private.io_addr + 1);
if (debug >= DEBUG) {
printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
printk(KERN_DEBUG PFX "sending: 0x%02x\n",
(control_status & WD_REVC_R2DS));
}
/* clear reset status & Keep Relay 2 disable state as it is */
outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1);
spin_unlock(&pcwd_private.io_lock);
}
return 0;
@ -481,6 +540,11 @@ static int pcwd_get_temperature(int *temperature)
*temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32;
spin_unlock(&pcwd_private.io_lock);
if (debug >= DEBUG) {
printk(KERN_DEBUG PFX "temperature is: %d F\n",
*temperature);
}
return 0;
}
@ -599,6 +663,8 @@ static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len,
static int pcwd_open(struct inode *inode, struct file *file)
{
if (!atomic_dec_and_test(&open_allowed) ) {
if (debug >= VERBOSE)
printk(KERN_ERR PFX "Attempt to open already opened device.\n");
atomic_inc( &open_allowed );
return -EBUSY;
}
@ -922,7 +988,8 @@ static void __exit pcwd_cleanup_module(void)
{
if (pcwd_private.io_addr)
pcwatchdog_exit();
return;
printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
}
module_init(pcwd_init_module);

3
drivers/char/watchdog/pcwd_usb.c
View File

@ -705,7 +705,8 @@ err_out_misc_deregister:
err_out_unregister_reboot:
unregister_reboot_notifier(&usb_pcwd_notifier);
error:
usb_pcwd_delete (usb_pcwd);
if (usb_pcwd)
usb_pcwd_delete(usb_pcwd);
usb_pcwd_device = NULL;
return retval;
}