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266 lines
5.7 KiB
Diff
266 lines
5.7 KiB
Diff
From 3c6c80a04d6ca99c4f9fbb5e4f279bd644b2df48 Mon Sep 17 00:00:00 2001
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From: Kurt Mahan <kmahan@freescale.com>
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Date: Tue, 8 Jul 2008 14:10:46 -0600
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Subject: [PATCH] Add Coldfire Watchdog support.
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LTIBName: mcfv4e-watchdog
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Signed-off-by: Kurt Mahan <kmahan@freescale.com>
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---
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drivers/watchdog/Kconfig | 9 ++
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drivers/watchdog/Makefile | 1 +
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drivers/watchdog/mcf_wdt.c | 220 ++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 230 insertions(+), 0 deletions(-)
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create mode 100644 drivers/watchdog/mcf_wdt.c
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -672,6 +672,15 @@ config TXX9_WDT
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# PARISC Architecture
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+# ColdFire Architecture
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+
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+config COLDFIRE_WATCHDOG
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+ tristate "ColdFire watchdog support"
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+ depends on WATCHDOG
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+ help
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+ To compile this driver as a module, choose M here: the
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+ module will be called softdog.
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+
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# POWERPC Architecture
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config MPC5200_WDT
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -86,6 +86,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc
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# M32R Architecture
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# M68K Architecture
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+obj-$(CONFIG_COLDFIRE_WATCHDOG) += mcf_wdt.o
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# M68KNOMMU Architecture
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--- /dev/null
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+++ b/drivers/watchdog/mcf_wdt.c
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@@ -0,0 +1,220 @@
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+/*
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+ * drivers/watchdog/mcf_wdt.c
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+ *
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+ * Watchdog driver for ColdFire processors
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+ *
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+ * Adapted from the IXP4xx watchdog driver.
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+ * The original version carries these notices:
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+ *
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+ * Author: Deepak Saxena <dsaxena@plexity.net>
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+ *
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+ * Copyright 2004 (c) MontaVista, Software, Inc.
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+ * Based on sa1100 driver, Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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+ *
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+ * This file is licensed under the terms of the GNU General Public
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+ * License version 2. This program is licensed "as is" without any
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+ * warranty of any kind, whether express or implied.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/moduleparam.h>
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+#include <linux/types.h>
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+#include <linux/kernel.h>
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+#include <linux/fs.h>
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+#include <linux/miscdevice.h>
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+#include <linux/watchdog.h>
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+#include <linux/init.h>
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+#include <linux/bitops.h>
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+
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+#include <asm-m68k/uaccess.h>
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+#include <asm-m68k/coldfire.h>
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+#include <asm-m68k/m5485gpt.h>
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+
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+static int nowayout;
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+static unsigned int heartbeat = 30; /* (secs) Default is 0.5 minute */
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+static unsigned long wdt_status;
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+
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+#define WDT_IN_USE 0
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+#define WDT_OK_TO_CLOSE 1
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+
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+static unsigned long wdt_tick_rate;
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+
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+static void
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+wdt_enable(void)
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+{
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+ MCF_GPT_GMS0 = 0;
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+ MCF_GPT_GCIR0 = MCF_GPT_GCIR_PRE(heartbeat*wdt_tick_rate) |
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+ MCF_GPT_GCIR_CNT(0xffff);
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+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS_WDEN |
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+ MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS_GPIO;
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+}
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+
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+static void
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+wdt_disable(void)
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+{
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+ MCF_GPT_GMS0 = 0;
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+}
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+
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+static void
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+wdt_keepalive(void)
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+{
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+ MCF_GPT_GMS0 = MCF_GPT_GMS_OCPW(0xA5) | MCF_GPT_GMS0;
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+}
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+
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+static int
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+mcf_wdt_open(struct inode *inode, struct file *file)
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+{
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+ if (test_and_set_bit(WDT_IN_USE, &wdt_status))
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+ return -EBUSY;
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+
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+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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+
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+ wdt_enable();
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+
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+ return nonseekable_open(inode, file);
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+}
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+
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+static ssize_t
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+mcf_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
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+{
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+ if (len) {
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+ if (!nowayout) {
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+ size_t i;
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+
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+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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+
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+ for (i = 0; i != len; i++) {
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+ char c;
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+
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+ if (get_user(c, data + i))
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+ return -EFAULT;
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+ if (c == 'V')
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+ set_bit(WDT_OK_TO_CLOSE, &wdt_status);
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+ }
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+ }
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+ wdt_keepalive();
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+ }
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+
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+ return len;
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+}
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+
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+
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+static struct watchdog_info ident = {
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+ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
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+ WDIOF_KEEPALIVEPING,
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+ .identity = "Coldfire Watchdog",
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+};
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+
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+static int
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+mcf_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ int ret = -ENOIOCTLCMD;
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+ int time;
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+
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+ switch (cmd) {
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+ case WDIOC_GETSUPPORT:
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+ ret = copy_to_user((struct watchdog_info *)arg, &ident,
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+ sizeof(ident)) ? -EFAULT : 0;
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+ break;
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+
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+ case WDIOC_GETSTATUS:
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+ ret = put_user(0, (int *)arg);
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+ break;
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+
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+ case WDIOC_GETBOOTSTATUS:
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+ ret = put_user(0, (int *)arg);
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+ break;
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+
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+ case WDIOC_SETTIMEOUT:
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+ ret = get_user(time, (int *)arg);
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+ if (ret)
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+ break;
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+
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+ if (time <= 0 || time > 30) {
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+ ret = -EINVAL;
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+ break;
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+ }
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+
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+ heartbeat = time;
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+ wdt_enable();
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+ /* Fall through */
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+
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+ case WDIOC_GETTIMEOUT:
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+ ret = put_user(heartbeat, (int *)arg);
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+ break;
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+
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+ case WDIOC_KEEPALIVE:
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+ wdt_keepalive();
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+ ret = 0;
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+ break;
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+ }
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+
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+ return ret;
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+}
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+
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+static int
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+mcf_wdt_release(struct inode *inode, struct file *file)
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+{
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+ if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) {
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+ wdt_disable();
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+ } else {
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+ printk(KERN_CRIT "WATCHDOG: Device closed unexpectdly - "
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+ "timer will not stop\n");
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+ }
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+
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+ clear_bit(WDT_IN_USE, &wdt_status);
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+ clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
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+
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+ return 0;
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+}
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+
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+
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+static struct file_operations mcf_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .write = mcf_wdt_write,
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+ .ioctl = mcf_wdt_ioctl,
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+ .open = mcf_wdt_open,
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+ .release = mcf_wdt_release,
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+};
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+
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+static struct miscdevice mcf_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &mcf_wdt_fops,
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+};
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+
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+static int __init mcf_wdt_init(void)
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+{
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+ wdt_tick_rate = MCF_BUSCLK/0xffff;
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+#ifdef CONFIG_WATCHDOG_NOWAYOUT
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+ nowayout = 1;
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+#else
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+ nowayout = 0;
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+#endif
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+ printk("ColdFire watchdog driver is loaded.\n");
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+
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+ return misc_register(&mcf_wdt_miscdev);
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+}
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+
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+static void __exit mcf_wdt_exit(void)
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+{
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+ misc_deregister(&mcf_wdt_miscdev);
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+}
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+
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+module_init(mcf_wdt_init);
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+module_exit(mcf_wdt_exit);
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+
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+MODULE_AUTHOR("Deepak Saxena");
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+MODULE_DESCRIPTION("ColdFire Watchdog");
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+
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+module_param(heartbeat, int, 0);
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+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds (default 60s)");
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+
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+module_param(nowayout, int, 0);
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+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
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+
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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+
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