add optional driver for the hw watchdog on gateworks avila boards (requires soldering...

SVN-Revision: 15300

diff --git a/package/avila-wdt/Makefile b/package/avila-wdt/Makefile
new file mode 100644 (file)
index 0000000..660c6c3
--- /dev/null
+++ b/package/avila-wdt/Makefile
@@ -0,0 +1,40 @@
+#
+# Copyright (C) 2008 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=avila-wdt
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/avila-wdt
+  SUBMENU:=Other modules
+  TITLE:=GPIO hardware watchdog driver for modified Avila boards
+  DEPENDS:=@GPIO_SUPPORT @TARGET_ixp4xx
+  FILES:=$(PKG_BUILD_DIR)/avila-wdt.$(LINUX_KMOD_SUFFIX)
+  AUTOLOAD:=$(call AutoLoad,10,avila-wdt)
+endef
+
+MAKE_OPTS:= \
+       ARCH="$(LINUX_KARCH)" \
+       CROSS_COMPILE="$(TARGET_CROSS)" \
+       SUBDIRS="$(PKG_BUILD_DIR)"
+
+define Build/Prepare
+       mkdir -p $(PKG_BUILD_DIR)
+       $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+       $(MAKE) -C "$(LINUX_DIR)" \
+               $(MAKE_OPTS) \
+               modules
+endef
+
+$(eval $(call KernelPackage,avila-wdt))

diff --git a/package/avila-wdt/src/Makefile b/package/avila-wdt/src/Makefile
new file mode 100644 (file)
index 0000000..90d9065
--- /dev/null
+++ b/package/avila-wdt/src/Makefile
@@ -0,0 +1 @@
+obj-m := avila-wdt.o

diff --git a/package/avila-wdt/src/avila-wdt.c b/package/avila-wdt/src/avila-wdt.c
new file mode 100644 (file)
index 0000000..6b3b42b
--- /dev/null
+++ b/package/avila-wdt/src/avila-wdt.c
@@ -0,0 +1,229 @@
+/*
+ * avila-wdt.c 
+ * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * based on:
+ * drivers/char/watchdog/ixp4xx_wdt.c
+ *
+ * Watchdog driver for Intel IXP4xx network processors
+ *
+ * Author: Deepak Saxena <dsaxena@plexity.net>
+ *
+ * Copyright 2004 (c) MontaVista, Software, Inc.
+ * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/uaccess.h>
+#include <mach/hardware.h>
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+static int heartbeat = 20;     /* (secs) Default is 20 seconds */
+static unsigned long wdt_status;
+static atomic_t wdt_counter;
+struct timer_list wdt_timer;
+
+#define        WDT_IN_USE              0
+#define        WDT_OK_TO_CLOSE         1
+#define WDT_RUNNING            2
+
+static void wdt_refresh(unsigned long data)
+{
+       if (test_bit(WDT_RUNNING, &wdt_status)) {
+               if (atomic_dec_and_test(&wdt_counter)) {
+                       printk(KERN_WARNING "Avila watchdog expired, expect a reboot soon!\n");
+                       clear_bit(WDT_RUNNING, &wdt_status);
+                       return;
+               }
+       }
+
+       /* strobe to the watchdog */
+       gpio_line_set(14, IXP4XX_GPIO_HIGH);
+       gpio_line_set(14, IXP4XX_GPIO_LOW);
+
+       mod_timer(&wdt_timer, jiffies + msecs_to_jiffies(500));
+}
+
+static void wdt_enable(void)
+{
+       atomic_set(&wdt_counter, heartbeat * 2);
+
+       /* Disable clock generator output on GPIO 14/15 */
+       *IXP4XX_GPIO_GPCLKR &= ~(1 << 8);
+
+       /* activate GPIO 14 out */
+       gpio_line_config(14, IXP4XX_GPIO_OUT);
+       gpio_line_set(14, IXP4XX_GPIO_LOW);
+
+       if (!test_bit(WDT_RUNNING, &wdt_status))
+               wdt_refresh(0);
+       set_bit(WDT_RUNNING, &wdt_status);
+}
+
+static void wdt_disable(void)
+{
+       /* NB: we can't turn off the watchdog anymore, so we
+        * have to keep running the strobe timer without decrementing
+        * the counter */
+       clear_bit(WDT_RUNNING, &wdt_status);
+}
+
+static int avila_wdt_open(struct inode *inode, struct file *file)
+{
+       if (test_and_set_bit(WDT_IN_USE, &wdt_status))
+               return -EBUSY;
+
+       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+       wdt_enable();
+       return nonseekable_open(inode, file);
+}
+
+static ssize_t
+avila_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+       if (len) {
+               if (!nowayout) {
+                       size_t i;
+
+                       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+                       for (i = 0; i != len; i++) {
+                               char c;
+
+                               if (get_user(c, data + i))
+                                       return -EFAULT;
+                               if (c == 'V')
+                                       set_bit(WDT_OK_TO_CLOSE, &wdt_status);
+                       }
+               }
+               wdt_enable();
+       }
+       return len;
+}
+
+static struct watchdog_info ident = {
+       .options        = WDIOF_CARDRESET | WDIOF_MAGICCLOSE |
+                         WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+       .identity       = "Avila Watchdog",
+};
+
+
+static long avila_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                       unsigned long arg)
+{
+       int ret = -ENOTTY;
+       int time;
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               ret = copy_to_user((struct watchdog_info *)arg, &ident,
+                                  sizeof(ident)) ? -EFAULT : 0;
+               break;
+
+       case WDIOC_GETSTATUS:
+               ret = put_user(0, (int *)arg);
+               break;
+
+       case WDIOC_KEEPALIVE:
+               wdt_enable();
+               ret = 0;
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               ret = get_user(time, (int *)arg);
+               if (ret)
+                       break;
+
+               if (time <= 0 || time > 60) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               heartbeat = time;
+               wdt_enable();
+               /* Fall through */
+
+       case WDIOC_GETTIMEOUT:
+               ret = put_user(heartbeat, (int *)arg);
+               break;
+       }
+       return ret;
+}
+
+static int avila_wdt_release(struct inode *inode, struct file *file)
+{
+       if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
+               wdt_disable();
+       else
+               printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
+                                       "timer will not stop\n");
+       clear_bit(WDT_IN_USE, &wdt_status);
+       clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
+
+       return 0;
+}
+
+
+static const struct file_operations avila_wdt_fops = {
+       .owner          = THIS_MODULE,
+       .llseek         = no_llseek,
+       .write          = avila_wdt_write,
+       .unlocked_ioctl = avila_wdt_ioctl,
+       .open           = avila_wdt_open,
+       .release        = avila_wdt_release,
+};
+
+static struct miscdevice avila_wdt_miscdev = {
+       .minor          = WATCHDOG_MINOR + 1,
+       .name           = "avila_watchdog",
+       .fops           = &avila_wdt_fops,
+};
+
+static int __init avila_wdt_init(void)
+{
+       int ret;
+
+       init_timer(&wdt_timer);
+       wdt_timer.expires = 0;
+       wdt_timer.data = 0;
+       wdt_timer.function = wdt_refresh;
+       ret = misc_register(&avila_wdt_miscdev);
+       if (ret == 0)
+               printk(KERN_INFO "Avila Watchdog Timer: heartbeat %d sec\n",
+                       heartbeat);
+       return ret;
+}
+
+static void __exit avila_wdt_exit(void)
+{
+       misc_deregister(&avila_wdt_miscdev);
+}
+
+
+module_init(avila_wdt_init);
+module_exit(avila_wdt_exit);
+
+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
+MODULE_DESCRIPTION("Gateworks Avila Hardware Watchdog");
+
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 20s)");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+