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

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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))
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