mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-05 13:30:38 +02:00
343c185b7d
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16547 3c298f89-4303-0410-b956-a3cf2f4a3e73
266 lines
5.7 KiB
Diff
266 lines
5.7 KiB
Diff
From 3c6c80a04d6ca99c4f9fbb5e4f279bd644b2df48 Mon Sep 17 00:00:00 2001
|
|
From: Kurt Mahan <kmahan@freescale.com>
|
|
Date: Tue, 8 Jul 2008 14:10:46 -0600
|
|
Subject: [PATCH] Add Coldfire Watchdog support.
|
|
|
|
LTIBName: mcfv4e-watchdog
|
|
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
|
|
---
|
|
drivers/watchdog/Kconfig | 9 ++
|
|
drivers/watchdog/Makefile | 1 +
|
|
drivers/watchdog/mcf_wdt.c | 220 ++++++++++++++++++++++++++++++++++++++++++++
|
|
3 files changed, 230 insertions(+), 0 deletions(-)
|
|
create mode 100644 drivers/watchdog/mcf_wdt.c
|
|
|
|
--- a/drivers/watchdog/Kconfig
|
|
+++ b/drivers/watchdog/Kconfig
|
|
@@ -672,6 +672,15 @@ config TXX9_WDT
|
|
|
|
# PARISC Architecture
|
|
|
|
+# ColdFire Architecture
|
|
+
|
|
+config COLDFIRE_WATCHDOG
|
|
+ tristate "ColdFire watchdog support"
|
|
+ depends on WATCHDOG
|
|
+ help
|
|
+ To compile this driver as a module, choose M here: the
|
|
+ module will be called softdog.
|
|
+
|
|
# POWERPC Architecture
|
|
|
|
config MPC5200_WDT
|
|
--- a/drivers/watchdog/Makefile
|
|
+++ b/drivers/watchdog/Makefile
|
|
@@ -86,6 +86,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc
|
|
# M32R Architecture
|
|
|
|
# M68K Architecture
|
|
+obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o
|
|
|
|
# M68KNOMMU Architecture
|
|
|
|
--- /dev/null
|
|
+++ b/drivers/watchdog/mcf_wdt.c
|
|
@@ -0,0 +1,220 @@
|
|
+/*
|
|
+ * drivers/watchdog/mcf_wdt.c
|
|
+ *
|
|
+ * Watchdog driver for ColdFire processors
|
|
+ *
|
|
+ * Adapted from the IXP4xx watchdog driver.
|
|
+ * The original version carries these notices:
|
|
+ *
|
|
+ * 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 <asm-m68k/uaccess.h>
|
|
+#include <asm-m68k/coldfire.h>
|
|
+#include <asm-m68k/m5485gpt.h>
|
|
+
|
|
+static int nowayout;
|
|
+static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */
|
|
+static unsigned long wdt_status;
|
|
+
|
|
+#define WDT_IN_USE 0
|
|
+#define WDT_OK_TO_CLOSE 1
|
|
+
|
|
+static unsigned long wdt_tick_rate;
|
|
+
|
|
+static void
|
|
+wdt_enable(void)
|
|
+{
|
|
+ MCF_GPT_GMS0 = 0;
|
|
+ MCF_GPT_GCIR0 = MCF_GPT_GCIR_PRE(heartbeat*wdt_tick_rate) |
|
|
+ MCF_GPT_GCIR_CNT(0xffff);
|
|
+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN |
|
|
+ MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS_GPIO;
|
|
+}
|
|
+
|
|
+static void
|
|
+wdt_disable(void)
|
|
+{
|
|
+ MCF_GPT_GMS0 = 0;
|
|
+}
|
|
+
|
|
+static void
|
|
+wdt_keepalive(void)
|
|
+{
|
|
+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0;
|
|
+}
|
|
+
|
|
+static int
|
|
+mcf_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
|
|
+mcf_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_keepalive();
|
|
+ }
|
|
+
|
|
+ return len;
|
|
+}
|
|
+
|
|
+
|
|
+static struct watchdog_info ident = {
|
|
+ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
|
|
+ WDIOF_KEEPALIVEPING,
|
|
+ .identity = "Coldfire Watchdog",
|
|
+};
|
|
+
|
|
+static int
|
|
+mcf_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
|
|
+ unsigned long arg)
|
|
+{
|
|
+ int ret = -ENOIOCTLCMD;
|
|
+ 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_GETBOOTSTATUS:
|
|
+ ret = put_user(0, (int *)arg);
|
|
+ break;
|
|
+
|
|
+ case WDIOC_SETTIMEOUT:
|
|
+ ret = get_user(time, (int *)arg);
|
|
+ if (ret)
|
|
+ break;
|
|
+
|
|
+ if (time <= 0 || time > 30) {
|
|
+ ret = -EINVAL;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ heartbeat = time;
|
|
+ wdt_enable();
|
|
+ /* Fall through */
|
|
+
|
|
+ case WDIOC_GETTIMEOUT:
|
|
+ ret = put_user(heartbeat, (int *)arg);
|
|
+ break;
|
|
+
|
|
+ case WDIOC_KEEPALIVE:
|
|
+ wdt_keepalive();
|
|
+ ret = 0;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int
|
|
+mcf_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 unexpectdly - "
|
|
+ "timer will not stop\n");
|
|
+ }
|
|
+
|
|
+ clear_bit(WDT_IN_USE, &wdt_status);
|
|
+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+
|
|
+static struct file_operations mcf_wdt_fops = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .llseek = no_llseek,
|
|
+ .write = mcf_wdt_write,
|
|
+ .ioctl = mcf_wdt_ioctl,
|
|
+ .open = mcf_wdt_open,
|
|
+ .release = mcf_wdt_release,
|
|
+};
|
|
+
|
|
+static struct miscdevice mcf_wdt_miscdev = {
|
|
+ .minor = WATCHDOG_MINOR,
|
|
+ .name = "watchdog",
|
|
+ .fops = &mcf_wdt_fops,
|
|
+};
|
|
+
|
|
+static int __init mcf_wdt_init(void)
|
|
+{
|
|
+ wdt_tick_rate = MCF_BUSCLK/0xffff;
|
|
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
|
|
+ nowayout = 1;
|
|
+#else
|
|
+ nowayout = 0;
|
|
+#endif
|
|
+ printk("ColdFire watchdog driver is loaded.\n");
|
|
+
|
|
+ return misc_register(&mcf_wdt_miscdev);
|
|
+}
|
|
+
|
|
+static void __exit mcf_wdt_exit(void)
|
|
+{
|
|
+ misc_deregister(&mcf_wdt_miscdev);
|
|
+}
|
|
+
|
|
+module_init(mcf_wdt_init);
|
|
+module_exit(mcf_wdt_exit);
|
|
+
|
|
+MODULE_AUTHOR("Deepak Saxena");
|
|
+MODULE_DESCRIPTION("ColdFire Watchdog");
|
|
+
|
|
+module_param(heartbeat, int, 0);
|
|
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
|
|
+
|
|
+module_param(nowayout, int, 0);
|
|
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
|
|
+
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
+
|