Hello,
Tested and working on Kontron JREX-PM.
fairly straightforward backport of w83627hf_wdt.c from 2.6.20.1
Changes from 2.6 version
Default timeout set to 120 seconds
Nonstandard read only proc interface (/proc/watchdog)
Always reset timer on driver load
Changed timeout limit to 255
Ignores failure to acquire IO port
Caveats:
Ignores failure to acquire IO port since it is always taken, there's
probably a better way around that.
Releases IO port regardless of having acquired it.
--
Tal Kelrich
PGP fingerprint: 3EDF FCC5 60BB 4729 AB2F CAE6 FEC1 9AAC 12B9 AA69
Key Available at: http://www.hasturkun.com/pub.txt
----
The real reason psychology is hard is that psychologists are trying to
do the impossible.
----
--- linux-2.4.34.2/drivers/char/Config.in Sat Mar 24 08:44:54 2007
+++ linux-2.4.34.2-w83627hf/drivers/char/Config.in Sun Apr 1 16:23:01 2007
@@ -263,6 +263,7 @@
tristate ' W83877F (EMACS) Watchdog Timer' CONFIG_W83877F_WDT
tristate ' WDT Watchdog timer' CONFIG_WDT
tristate ' WDT PCI Watchdog timer' CONFIG_WDTPCI
+ tristate ' W83627HF/F/HG/G Watchdog' CONFIG_WDT_W83627
if [ "$CONFIG_WDT" != "n" ]; then
bool ' WDT501 features' CONFIG_WDT_501
if [ "$CONFIG_WDT_501" = "y" ]; then
--- linux-2.4.34.2/drivers/char/Makefile Sat Mar 24 08:44:54 2007
+++ linux-2.4.34.2-w83627hf/drivers/char/Makefile Sun Apr 1 16:23:01 2007
@@ -323,6 +323,7 @@
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_INDYDOG) += indydog.o
obj-$(CONFIG_8xx_WDT) += mpc8xx_wdt.o
+obj-$(CONFIG_WDT_W83627) += wdt83627.o
subdir-$(CONFIG_MWAVE) += mwave
ifeq ($(CONFIG_MWAVE),y)
--- linux-2.4.34.2/drivers/char/wdt83627.c Thu Jan 1 02:00:00 1970
+++ linux-2.4.34.2-w83627hf/drivers/char/wdt83627.c Sun Apr 1 16:22:35 2007
@@ -0,0 +1,416 @@
+/*
+ * w83627hf WDT driver
+ *
+ * backported from w83627hf_wdt.c kernel 2.6.20.1
+ * (c) Copyright 2007 Orpak Systems Ltd. (Tal Kelrich <[EMAIL PROTECTED]>)
+ *
+ * (c) Copyright 2003 Pádraig Brady <[EMAIL PROTECTED]>
+ *
+ * Based on advantechwdt.c which is based on wdt.c.
+ * Original copyright messages:
+ *
+ * (c) Copyright 2000-2001 Marek Michalkiewicz <[EMAIL PROTECTED]>
+ *
+ * (c) Copyright 1996 Alan Cox <[EMAIL PROTECTED]>, All Rights Reserved.
+ * http://www.redhat.com
+ *
+ * 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 Alan Cox nor CymruNet Ltd. admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 1995 Alan Cox <[EMAIL PROTECTED]>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.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 <linux/proc_fs.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/page.h>
+
+#define WATCHDOG_NAME "W83627HF WDT"
+#define PFX WATCHDOG_NAME ": "
+#define WATCHDOG_TIMEOUT 120 /* 120 sec default timeout */
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+#define WATCHDOG_NOWAYOUT 1
+#else
+#define WATCHDOG_NOWAYOUT 0
+#endif
+
+static unsigned long wdt_is_open;
+static char expect_close;
+static spinlock_t io_lock;
+
+/* You must set this - there is no sane way to probe for this board. */
+static int wdt_io = 0x2E;
+MODULE_PARM(wdt_io, "i");
+MODULE_PARM_DESC(wdt_io, "w83627hf WDT io port (default 0x2E)");
+
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+MODULE_PARM(timeout, "i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255,
default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+MODULE_PARM(nowayout, "i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(CONFIG_WATCHDOG_NOWAYOUT)")");
+
+/*
+ * Kernel methods.
+ */
+
+#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
+#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register (same as
EFER) */
+#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
+
+/* Non standard proc bits, added by request, wanted some feedback */
+
+static int wdt_readproc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int len;
+ unsigned char remaining;
+ unsigned char fired;
+ spin_lock(&io_lock);
+ w83627hf_select_wd_register();
+ outb_p(0xF6, WDT_EFIR);/* get current timer val */
+ remaining=inb_p(WDT_EFDR);
+ outb_p(0xF7, WDT_EFIR);
+ fired=inb_p(WDT_EFDR);
+ /* clear that bit (bit 4) */
+ outb_p(fired&(~0x10),WDT_EFDR);
+ w83627hf_unselect_wd_register();
+ spin_unlock(&io_lock);
+ fired=(fired&0x10)!=0;
+ len=snprintf(page,PAGE_SIZE,
+ "W83627HF WDT\n"
+ "active=%d\n"
+ "iobase=%04X\n"
+ "nowayout=%d\n"
+ "timeout=%d\n"
+ "remaining=%d\n"
+ "fired=%d\n",
+ wdt_is_open,wdt_io,nowayout,timeout,remaining,fired);
+ *eof=1;
+ return len;
+}
+
+static void
+w83627hf_select_wd_register(void)
+{
+ outb_p(0x87, WDT_EFER); /* Enter extended function mode */
+ outb_p(0x87, WDT_EFER); /* Again according to manual */
+
+ outb_p(0x07, WDT_EFER); /* point to logical device number reg */
+ outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
+ outb_p(0x30, WDT_EFER); /* select CR30 */
+ outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
+}
+
+static void
+w83627hf_unselect_wd_register(void)
+{
+ outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
+}
+
+/* tyan motherboards seem to set F5 to 0x4C ?
+ * So explicitly init to appropriate value. */
+static void
+w83627hf_init(void)
+{
+ unsigned char t;
+
+ w83627hf_select_wd_register();
+
+ outb_p(0xF6, WDT_EFER); /* Select CRF6 */
+ outb_p(0, WDT_EFDR); /* set to 0 initially */
+ outb_p(0xF5, WDT_EFER); /* Select CRF5 */
+ t=inb_p(WDT_EFDR); /* read CRF5 */
+ t&=~0x0C; /* set second mode & disable keyboard turning
off watchdog */
+ outb_p(t, WDT_EFDR); /* Write back to CRF5 */
+
+ w83627hf_unselect_wd_register();
+}
+
+static void
+wdt_ctrl(int timeout)
+{
+ spin_lock(&io_lock);
+
+ w83627hf_select_wd_register();
+
+ outb_p(0xF6, WDT_EFER); /* Select CRF6 */
+ outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
+
+ w83627hf_unselect_wd_register();
+
+ spin_unlock(&io_lock);
+}
+
+static int
+wdt_ping(void)
+{
+ wdt_ctrl(timeout);
+ return 0;
+}
+
+static int
+wdt_disable(void)
+{
+ wdt_ctrl(0);
+ return 0;
+}
+
+static int
+wdt_set_heartbeat(int t)
+{
+ if ((t < 1) || (t > 255))
+ return -EINVAL;
+
+ timeout = t;
+ return 0;
+}
+
+static ssize_t
+wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+ /* Can't seek (pwrite) on this device */
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+ if (count) {
+ if (!nowayout) {
+ size_t i;
+
+ expect_close = 0;
+
+ for (i = 0; i != count; i++) {
+ char c;
+ if (get_user(c, buf+i))
+ return -EFAULT;
+ if (c == 'V')
+ expect_close = 42;
+ }
+ }
+ wdt_ping();
+ }
+ return count;
+}
+
+static int
+wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ void *argp = (void *)arg;
+ int *p = argp;
+ int new_timeout;
+ static struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
WDIOF_MAGICCLOSE,
+ .firmware_version = 1,
+ .identity = "W83627HF WDT",
+ };
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &ident, sizeof(ident)))
+ return -EFAULT;
+ break;
+
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+
+ case WDIOC_KEEPALIVE:
+ wdt_ping();
+ break;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_timeout, p))
+ return -EFAULT;
+ if (wdt_set_heartbeat(new_timeout))
+ return -EINVAL;
+ wdt_ping();
+ /* Fall */
+
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout, p);
+
+ case WDIOC_SETOPTIONS:
+ {
+ int options, retval = -EINVAL;
+
+ if (get_user(options, p))
+ return -EFAULT;
+
+ if (options & WDIOS_DISABLECARD) {
+ wdt_disable();
+ retval = 0;
+ }
+
+ if (options & WDIOS_ENABLECARD) {
+ wdt_ping();
+ retval = 0;
+ }
+
+ return retval;
+ }
+
+ default:
+ return -ENOTTY;
+ }
+ return 0;
+}
+
+static int
+wdt_open(struct inode *inode, struct file *file)
+{
+ if (test_and_set_bit(0, &wdt_is_open))
+ return -EBUSY;
+ /*
+ * Activate
+ */
+
+ wdt_ping();
+ return 0;
+}
+
+static int
+wdt_close(struct inode *inode, struct file *file)
+{
+ if (expect_close == 42) {
+ wdt_disable();
+ } else {
+ printk(KERN_CRIT PFX "Unexpected close, not stopping
watchdog!\n");
+ wdt_ping();
+ }
+ expect_close = 0;
+ clear_bit(0, &wdt_is_open);
+ return 0;
+}
+
+/*
+ * Notifier for system down
+ */
+
+static int
+wdt_notify_sys(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ if (code == SYS_DOWN || code == SYS_HALT) {
+ /* Turn the WDT off */
+ wdt_disable();
+ }
+ return NOTIFY_DONE;
+}
+
+/*
+ * Kernel Interfaces
+ */
+
+static const struct file_operations wdt_fops = {
+ .owner = THIS_MODULE,
+ .write = wdt_write,
+ .ioctl = wdt_ioctl,
+ .open = wdt_open,
+ .release = wdt_close,
+};
+
+static struct miscdevice wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &wdt_fops,
+};
+
+/*
+ * The WDT needs to learn about soft shutdowns in order to
+ * turn the timebomb registers off.
+ */
+
+static struct notifier_block wdt_notifier = {
+ .notifier_call = wdt_notify_sys,
+};
+
+static int __init
+wdt_init(void)
+{
+ int ret;
+
+ spin_lock_init(&io_lock);
+
+ printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF Super I/O
chip initialising.\n");
+
+ if (wdt_set_heartbeat(timeout)) {
+ wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk (KERN_INFO PFX "timeout value must be 1<=timeout<=63,
using %d\n",
+ WATCHDOG_TIMEOUT);
+ }
+ /* on the board I was working on, wdt_io consistently coincided with
things already
+ * being used, hence the continuing here.
+ * there's probably a better solution to this */
+ if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
+ printk (KERN_WARNING PFX "I/O address 0x%04x already in use,
continuing anyway\n",
+ wdt_io);
+ }
+ if(!create_proc_read_entry("watchdog",0,NULL,&wdt_readproc,NULL))
+ goto unreg_regions;
+
+ w83627hf_init();
+
+ ret = register_reboot_notifier(&wdt_notifier);
+ if (ret != 0) {
+ printk (KERN_ERR PFX "cannot register reboot notifier
(err=%d)\n",
+ ret);
+ goto unreg_proc;
+ }
+
+ ret = misc_register(&wdt_miscdev);
+ if (ret != 0) {
+ printk (KERN_ERR PFX "cannot register miscdev on minor=%d
(err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ goto unreg_reboot;
+ }
+
+ printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n",
+ timeout, nowayout);
+
+out:
+ return ret;
+unreg_reboot:
+ unregister_reboot_notifier(&wdt_notifier);
+unreg_proc:
+ remove_proc_entry("watchdog",NULL);
+unreg_regions:
+ release_region(wdt_io, 1);
+ goto out;
+}
+
+static void __exit
+wdt_exit(void)
+{
+ remove_proc_entry("watchdog",NULL);
+ misc_deregister(&wdt_miscdev);
+ unregister_reboot_notifier(&wdt_notifier);
+ release_region(wdt_io,1);
+ /* we might not have gotten it... is this safe? */
+}
+
+module_init(wdt_init);
+module_exit(wdt_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pádraig Brady <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("w83627hf WDT driver");
