openwrt/target/linux/ar7-2.4/patches/005-wdt_driver.patch

diff -ruN linux-2.4.30-patch006/drivers/char/ar7_wdt.c linux-2.4.30-patch007/drivers/char/ar7_wdt.c
--- linux-2.4.30-patch006/drivers/char/ar7_wdt.c	1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.30-patch007/drivers/char/ar7_wdt.c	2005-10-27 09:39:40.000000000 +0200
@@ -0,0 +1,335 @@
+/* linux/drivers/char/ar7_wdt.c 
+
+   TI AR7 watch dog timer support
+
+   Copyright (c) 2005 Enrik Berkhan <Enrik.Berkhan@akk.org>
+
+   Som code taken from:
+   National Semiconductor SCx200 Watchdog support
+   Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.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.
+
+   The author(s) of this software shall not be held liable for damages
+   of any nature resulting due to the use of this software. This
+   software is provided AS-IS with no warranties. */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/ioport.h>
+
+#include <asm/uaccess.h>
+
+#include <asm/ar7/avalanche_misc.h>
+#include <asm/ar7/sangam.h>
+
+#define NAME "ar7_wdt"
+#define LONGNAME "TI AR7 Watchdog Timer"
+
+MODULE_AUTHOR("Enrik Berkhan <Enrik.Berkhan@akk.org>");
+MODULE_DESCRIPTION(LONGNAME);
+MODULE_LICENSE("GPL");
+
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+#define CONFIG_WATCHDOG_NOWAYOUT 0
+#endif
+
+static int margin = 60;
+MODULE_PARM(margin, "i");
+MODULE_PARM_DESC(margin, "Watchdog margin in seconds (1 - ~68)");
+
+static int nowayout = CONFIG_WATCHDOG_NOWAYOUT;
+MODULE_PARM(nowayout, "i");
+MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
+
+typedef struct {
+  uint32_t kick_lock;
+  uint32_t kick;
+  uint32_t change_lock;
+  uint32_t change ;
+  uint32_t disable_lock;
+  uint32_t disable;
+  uint32_t prescale_lock;
+  uint32_t prescale;
+} ar7_wdt_t;
+
+volatile ar7_wdt_t *ar7_wdt = (ar7_wdt_t *)AVALANCHE_WATCHDOG_TIMER_BASE;
+
+static struct semaphore open_semaphore;
+static unsigned expect_close;
+
+/* XXX correct? assumed to be sysfreq/2. get this dynamically ... */
+#define vbus_freq 62500000
+
+/* XXX currently fixed, allows max margin ~68.72 secs */
+#define prescale_value 0xFFFF
+
+static void ar7_wdt_kick(uint32_t value)
+{
+  ar7_wdt->kick_lock = 0x5555;
+  if ((ar7_wdt->kick_lock & 3) == 1) {
+    ar7_wdt->kick_lock = 0xAAAA;
+    if ((ar7_wdt->kick_lock & 3) == 3) {
+      ar7_wdt->kick = value;
+      return;
+    }
+  }
+  printk(KERN_ERR NAME "failed to unlock WDT kick reg\n");
+}
+
+static void ar7_wdt_prescale(uint32_t value)
+{
+  ar7_wdt->prescale_lock = 0x5A5A;
+  if ((ar7_wdt->prescale_lock & 3) == 1) {
+    ar7_wdt->prescale_lock = 0xA5A5;
+    if ((ar7_wdt->prescale_lock & 3) == 3) {
+      ar7_wdt->prescale = value;
+      return;
+    }
+  }
+  printk(KERN_ERR NAME "failed to unlock WDT prescale reg\n");
+}
+
+static void ar7_wdt_change(uint32_t value)
+{
+  ar7_wdt->change_lock = 0x6666;
+  if ((ar7_wdt->change_lock & 3) == 1) {
+    ar7_wdt->change_lock = 0xBBBB;
+    if ((ar7_wdt->change_lock & 3) == 3) {
+      ar7_wdt->change = value;
+      return;
+    }
+  }
+  printk(KERN_ERR NAME "failed to unlock WDT change reg\n");
+}
+
+static void ar7_wdt_disable(uint32_t value)
+{
+  ar7_wdt->disable_lock = 0x7777;
+  if ((ar7_wdt->disable_lock & 3) == 1) {
+    ar7_wdt->disable_lock = 0xCCCC;
+    if ((ar7_wdt->disable_lock & 3) == 2) {
+      ar7_wdt->disable_lock = 0xDDDD; 
+      if ((ar7_wdt->disable_lock & 3) == 3) {
+	ar7_wdt->disable = value;
+	return;
+      }
+    }
+  }
+  printk(KERN_ERR NAME "failed to unlock WDT disable reg\n");
+  return;
+}
+
+static void ar7_wdt_update_margin(int new_margin)
+{
+        uint32_t change;
+
+	change = new_margin * (vbus_freq / prescale_value);
+	if (change < 1) change = 1;
+	if (change > 0xFFFF) change = 0xFFFF;
+	ar7_wdt_change(change);
+	margin = change * prescale_value / vbus_freq;
+	printk(KERN_INFO NAME
+	       ": timer margin %d seconds (prescale %d, change %d, freq %d)\n",
+	       margin, prescale_value, change, vbus_freq);
+}
+
+static void ar7_wdt_enable_wdt(void)
+{
+	printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
+	ar7_wdt_disable(1);
+	ar7_wdt_kick(1);
+}
+
+static void ar7_wdt_disable_wdt(void)
+{
+	printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
+	ar7_wdt_disable(0);
+}
+
+static int ar7_wdt_open(struct inode *inode, struct file *file)
+{
+        /* only allow one at a time */
+        if (down_trylock(&open_semaphore))
+                return -EBUSY;
+	ar7_wdt_enable_wdt();
+	expect_close = 0;
+
+	return 0;
+}
+
+static int ar7_wdt_release(struct inode *inode, struct file *file)
+{
+	if (!expect_close) {
+		printk(KERN_WARNING NAME ": watchdog device closed unexpectedly, will not disable the watchdog timer\n");
+	} else if (!nowayout) {
+		ar7_wdt_disable_wdt();
+	}
+        up(&open_semaphore);
+
+	return 0;
+}
+
+static int ar7_wdt_notify_sys(struct notifier_block *this, 
+				      unsigned long code, void *unused)
+{
+        if (code == SYS_HALT || code == SYS_POWER_OFF)
+		if (!nowayout)
+			ar7_wdt_disable_wdt();
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block ar7_wdt_notifier =
+{
+        .notifier_call = ar7_wdt_notify_sys
+};
+
+static ssize_t ar7_wdt_write(struct file *file, const char *data, 
+				     size_t len, loff_t *ppos)
+{
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+
+	/* check for a magic close character */
+	if (len) 
+	{
+		size_t i;
+
+		ar7_wdt_kick(1);
+
+		expect_close = 0;
+		for (i = 0; i < len; ++i) {
+			char c;
+			if (get_user(c, data+i))
+				return -EFAULT;
+			if (c == 'V')
+				expect_close = 1;
+		}
+
+	}
+	return len;
+}
+
+static int ar7_wdt_ioctl(struct inode *inode, struct file *file,
+	unsigned int cmd, unsigned long arg)
+{
+	static struct watchdog_info ident = {
+		.identity = LONGNAME,
+		.firmware_version = 1, 
+		.options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING),
+	};
+	int new_margin;
+	
+	switch (cmd) {
+	default:
+		return -ENOTTY;
+	case WDIOC_GETSUPPORT:
+		if(copy_to_user((struct watchdog_info *)arg, &ident, 
+				sizeof(ident)))
+			return -EFAULT;
+		return 0;
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		if (put_user(0, (int *)arg))
+			return -EFAULT;
+		return 0;
+	case WDIOC_KEEPALIVE:
+		ar7_wdt_kick(1);
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, (int *)arg))
+			return -EFAULT;
+		if (new_margin < 1)
+			return -EINVAL;
+
+		ar7_wdt_update_margin(new_margin);
+		ar7_wdt_kick(1);
+
+	case WDIOC_GETTIMEOUT:
+		if (put_user(margin, (int *)arg))
+			return -EFAULT;
+		return 0;
+	}
+}
+
+static struct file_operations ar7_wdt_fops = {
+	.owner	 = THIS_MODULE,
+	.write   = ar7_wdt_write,
+	.ioctl   = ar7_wdt_ioctl,
+	.open    = ar7_wdt_open,
+	.release = ar7_wdt_release,
+};
+
+static struct miscdevice ar7_wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name  = "watchdog",
+	.fops  = &ar7_wdt_fops,
+};
+
+static __initdata char *last_initiator[] = {
+  [HARDWARE_RESET] = "hardware reset",
+  [SOFTWARE_RESET0] = "SW0 software reset",
+  [SOFTWARE_RESET1] = "SW1 software reset",
+  [WATCHDOG_RESET] = "watchdog"
+};
+
+static int __init ar7_wdt_init(void)
+{
+	int r;
+
+	if (!request_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
+				sizeof(ar7_wdt_t), LONGNAME)) {
+		printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
+		return -EBUSY;
+	}
+
+	printk(KERN_INFO NAME ": last system reset initiated by %s\n",
+	       last_initiator[avalanche_get_sys_last_reset_status()]);
+
+
+	ar7_wdt_disable_wdt();
+	ar7_wdt_prescale(prescale_value);
+	ar7_wdt_update_margin(margin);
+
+	sema_init(&open_semaphore, 1);
+
+	r = misc_register(&ar7_wdt_miscdev);
+	if (r) {
+                printk(KERN_ERR NAME ": unable to register misc device\n");
+		release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
+				   sizeof(ar7_wdt_t));
+		return r;
+	}
+
+	r = register_reboot_notifier(&ar7_wdt_notifier);
+        if (r) {
+                printk(KERN_ERR NAME ": unable to register reboot notifier\n");
+		misc_deregister(&ar7_wdt_miscdev);
+		release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE,
+				   sizeof(ar7_wdt_t));
+                return r;
+        }
+
+	return 0;
+}
+
+static void __exit ar7_wdt_cleanup(void)
+{
+        unregister_reboot_notifier(&ar7_wdt_notifier);
+	misc_deregister(&ar7_wdt_miscdev);
+	release_mem_region(AVALANCHE_WATCHDOG_TIMER_BASE, sizeof(ar7_wdt_t));
+}
+
+module_init(ar7_wdt_init);
+module_exit(ar7_wdt_cleanup);
diff -ruN linux-2.4.30-patch006/drivers/char/Config.in linux-2.4.30-patch007/drivers/char/Config.in
--- linux-2.4.30-patch006/drivers/char/Config.in	2005-10-27 11:25:29.000000000 +0200
+++ linux-2.4.30-patch007/drivers/char/Config.in	2005-10-27 11:17:32.000000000 +0200
@@ -251,6 +251,9 @@
 bool 'Watchdog Timer Support'	CONFIG_WATCHDOG
 if [ "$CONFIG_WATCHDOG" != "n" ]; then
    bool '  Disable watchdog shutdown on close' CONFIG_WATCHDOG_NOWAYOUT
+   if [ "$CONFIG_AR7" = "y" ] ; then
+     tristate '  TI AR7 Watchdog Timer' CONFIG_AR7_WDT
+   else
    tristate '  Acquire SBC Watchdog Timer' CONFIG_ACQUIRE_WDT
    tristate '  Advantech SBC Watchdog Timer' CONFIG_ADVANTECH_WDT
    tristate '  ALi M7101 PMU on ALi 1535D+ Watchdog Timer' CONFIG_ALIM1535_WDT
@@ -271,7 +274,6 @@
    tristate '  SBC-60XX Watchdog Timer' CONFIG_60XX_WDT
    dep_tristate '  SC1200 Watchdog Timer (EXPERIMENTAL)' CONFIG_SC1200_WDT $CONFIG_EXPERIMENTAL
    tristate '  NatSemi SCx200 Watchdog' CONFIG_SCx200_WDT
-   tristate '  Software Watchdog' CONFIG_SOFT_WATCHDOG
    tristate '  W83877F (EMACS) Watchdog Timer' CONFIG_W83877F_WDT
    tristate '  WDT Watchdog timer' CONFIG_WDT
    tristate '  WDT PCI Watchdog timer' CONFIG_WDTPCI
@@ -282,6 +284,8 @@
       fi
    fi
    tristate '  ZF MachZ Watchdog' CONFIG_MACHZ_WDT
+   fi
+   tristate '  Software Watchdog' CONFIG_SOFT_WATCHDOG
    if [ "$CONFIG_SGI_IP22" = "y" ]; then
       dep_tristate '  Indy/I2 Hardware Watchdog' CONFIG_INDYDOG $CONFIG_SGI_IP22
    fi
diff -ruN linux-2.4.30-patch006/drivers/char/Makefile linux-2.4.30-patch007/drivers/char/Makefile
--- linux-2.4.30-patch006/drivers/char/Makefile	2005-10-27 11:19:38.000000000 +0200
+++ linux-2.4.30-patch007/drivers/char/Makefile	2005-10-27 09:39:40.000000000 +0200
@@ -342,6 +342,7 @@
 obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_8xx_WDT) += mpc8xx_wdt.o
+obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
 
 subdir-$(CONFIG_MWAVE) += mwave
 ifeq ($(CONFIG_MWAVE),y)
diff -ruN linux-2.4.30-patch006/include/asm-mips/ar7/sangam.h linux-2.4.30-patch007/include/asm-mips/ar7/sangam.h
--- linux-2.4.30-patch006/include/asm-mips/ar7/sangam.h	2005-10-27 11:25:51.000000000 +0200
+++ linux-2.4.30-patch007/include/asm-mips/ar7/sangam.h	2005-10-27 11:13:37.000000000 +0200
@@ -152,7 +152,7 @@
 #define AVALANCHE_EMIF_SDRAM_CFG      (AVALANCHE_EMIF_CONTROL_BASE + 0x8)
 #define AVALANCHE_RST_CTRL_PRCR       (KSEG1ADDR(0x08611600))
 #define AVALANCHE_RST_CTRL_SWRCR      (KSEG1ADDR(0x08611604))
-#define AVALANCHE_RST_CTRL_RSR        (KSEG1ADDR(0x08611600))
+#define AVALANCHE_RST_CTRL_RSR        (KSEG1ADDR(0x08611608))
 
 #define AVALANCHE_POWER_CTRL_PDCR     (KSEG1ADDR(0x08610A00))
 #define AVALANCHE_WAKEUP_CTRL_WKCR    (KSEG1ADDR(0x08610A0C))