333 lines
8.2 KiB
Diff
333 lines
8.2 KiB
Diff
This add watchdog driver for broadcom 47xx device.
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It uses the ssb subsytem to access embeded watchdog device.
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Because the watchdog timeout is very short (about 2s), a soft timer is used
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to increase the watchdog period.
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Note : A patch for exporting the ssb_watchdog_timer_set will
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be submitted on next linux-mips merge. Without this patch it can't
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be build as a module.
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Signed-off-by: Aleksandar Radovanovic <biblbroks@sezampro.rs>
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Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
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Index: linux-2.6/drivers/watchdog/Kconfig
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===================================================================
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--- linux-2.6.orig/drivers/watchdog/Kconfig 2009-05-25 22:22:02.000000000 +0200
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+++ linux-2.6/drivers/watchdog/Kconfig 2009-06-05 22:05:19.000000000 +0200
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@@ -764,6 +764,12 @@
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help
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Hardware driver for the built-in watchdog timer on TXx9 MIPS SoCs.
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+config BCM47XX_WDT
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+ tristate "Broadcom BCM47xx Watchdog Timer"
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+ depends on BCM47XX
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+ help
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+ Hardware driver for the Broadcom BCM47xx Watchog Timer.
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+
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# PARISC Architecture
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# POWERPC Architecture
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Index: linux-2.6/drivers/watchdog/Makefile
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===================================================================
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--- linux-2.6.orig/drivers/watchdog/Makefile 2009-05-25 22:22:02.000000000 +0200
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+++ linux-2.6/drivers/watchdog/Makefile 2009-05-25 23:02:27.000000000 +0200
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@@ -105,6 +105,7 @@
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obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
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obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
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obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
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+obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
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# PARISC Architecture
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Index: linux-2.6/drivers/watchdog/bcm47xx_wdt.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-2.6/drivers/watchdog/bcm47xx_wdt.c 2009-06-05 22:25:37.000000000 +0200
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@@ -0,0 +1,286 @@
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+/*
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+ * Watchdog driver for Broadcom BCM47XX
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+ *
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+ * Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
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+ * Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ */
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+
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+#include <linux/bitops.h>
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+#include <linux/errno.h>
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+#include <linux/fs.h>
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+#include <linux/init.h>
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+#include <linux/kernel.h>
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+#include <linux/miscdevice.h>
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+#include <linux/module.h>
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+#include <linux/moduleparam.h>
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+#include <linux/reboot.h>
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+#include <linux/types.h>
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+#include <linux/uaccess.h>
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+#include <linux/watchdog.h>
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+#include <linux/timer.h>
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+#include <linux/jiffies.h>
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+#include <linux/ssb/ssb_embedded.h>
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+#include <asm/mach-bcm47xx/bcm47xx.h>
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+
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+#define DRV_NAME "bcm47xx_wdt"
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+
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+#define WDT_DEFAULT_TIME 30 /* seconds */
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+#define WDT_MAX_TIME 256 /* seconds */
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+
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+static int wdt_time = WDT_DEFAULT_TIME;
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+static int nowayout = WATCHDOG_NOWAYOUT;
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+
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+module_param(wdt_time, int, 0);
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+MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
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+ __MODULE_STRING(WDT_DEFAULT_TIME) ")");
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+
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+#ifdef CONFIG_WATCHDOG_NOWAYOUT
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+module_param(nowayout, int, 0);
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+MODULE_PARM_DESC(nowayout,
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+ "Watchdog cannot be stopped once started (default="
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+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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+#endif
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+
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+static unsigned long bcm47xx_wdt_busy;
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+static char expect_release;
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+static struct timer_list wdt_timer;
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+static atomic_t ticks;
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+
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+static inline void bcm47xx_wdt_hw_start(void)
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+{
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+ /* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */
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+ ssb_watchdog_timer_set(&ssb_bcm47xx, 0xfffffff);
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+}
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+
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+static inline int bcm47xx_wdt_hw_stop(void)
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+{
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+ return ssb_watchdog_timer_set(&ssb_bcm47xx, 0);
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+}
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+
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+static void bcm47xx_timer_tick(unsigned long unused)
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+{
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+ if (!atomic_dec_and_test(&ticks)) {
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+ bcm47xx_wdt_hw_start();
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+ mod_timer(&wdt_timer, jiffies + HZ);
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+ } else {
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+ printk(KERN_CRIT DRV_NAME "Watchdog will fire soon!!!\n");
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+ }
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+}
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+
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+static inline void bcm47xx_wdt_pet(void)
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+{
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+ atomic_set(&ticks, wdt_time);
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+}
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+
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+static void bcm47xx_wdt_start(void)
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+{
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+ bcm47xx_wdt_pet();
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+ bcm47xx_timer_tick(0);
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+}
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+
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+static void bcm47xx_wdt_pause(void)
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+{
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+ del_timer_sync(&wdt_timer);
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+ bcm47xx_wdt_hw_stop();
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+}
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+
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+static void bcm47xx_wdt_stop(void)
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+{
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+ bcm47xx_wdt_pause();
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+}
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+
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+static int bcm47xx_wdt_settimeout(int new_time)
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+{
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+ if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
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+ return -EINVAL;
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+
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+ wdt_time = new_time;
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+ return 0;
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+}
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+
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+static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
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+{
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+ if (test_and_set_bit(0, &bcm47xx_wdt_busy))
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+ return -EBUSY;
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+
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+ bcm47xx_wdt_start();
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+ return nonseekable_open(inode, file);
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+}
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+
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+static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
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+{
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+ if (expect_release == 42) {
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+ bcm47xx_wdt_stop();
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+ } else {
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+ printk(KERN_CRIT DRV_NAME
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+ ": Unexpected close, not stopping watchdog!\n");
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+ bcm47xx_wdt_start();
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+ }
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+
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+ clear_bit(0, &bcm47xx_wdt_busy);
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+ expect_release = 0;
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+ return 0;
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+}
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+
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+static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
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+ 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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+ expect_release = 0;
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+
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+ for (i = 0; i != len; i++) {
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+ char c;
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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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+ expect_release = 42;
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+ }
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+ }
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+ bcm47xx_wdt_pet();
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+ }
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+ return len;
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+}
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+
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+static struct watchdog_info bcm47xx_wdt_info = {
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+ .identity = DRV_NAME,
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+ .options = WDIOF_SETTIMEOUT |
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+ WDIOF_KEEPALIVEPING |
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+ WDIOF_MAGICCLOSE,
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+};
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+
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+static long bcm47xx_wdt_ioctl(struct file *file,
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+ unsigned int cmd, unsigned long arg)
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+{
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+ void __user *argp = (void __user *)arg;
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+ int __user *p = argp;
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+ int new_value, retval = -EINVAL;;
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+
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+ switch (cmd) {
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+ case WDIOC_GETSUPPORT:
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+ return copy_to_user(argp, &bcm47xx_wdt_info,
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+ sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
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+
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+ case WDIOC_GETSTATUS:
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+ case WDIOC_GETBOOTSTATUS:
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+ return put_user(0, p);
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+
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+ case WDIOC_SETOPTIONS:
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+ if (get_user(new_value, p))
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+ return -EFAULT;
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+
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+ if (new_value & WDIOS_DISABLECARD) {
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+ bcm47xx_wdt_stop();
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+ retval = 0;
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+ }
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+
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+ if (new_value & WDIOS_ENABLECARD) {
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+ bcm47xx_wdt_start();
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+ retval = 0;
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+ }
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+
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+ return retval;
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+
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+ case WDIOC_KEEPALIVE:
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+ bcm47xx_wdt_pet();
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+ return 0;
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+
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+ case WDIOC_SETTIMEOUT:
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+ if (get_user(new_value, p))
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+ return -EFAULT;
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+
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+ if (bcm47xx_wdt_settimeout(new_value))
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+ return -EINVAL;
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+
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+ bcm47xx_wdt_pet();
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+
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+ case WDIOC_GETTIMEOUT:
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+ return put_user(wdt_time, p);
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+
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+ default:
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+ return -ENOTTY;
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+ }
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+}
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+
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+static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
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+ unsigned long code, void *unused)
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+{
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+ if (code == SYS_DOWN || code == SYS_HALT)
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+ bcm47xx_wdt_stop();
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+ return NOTIFY_DONE;
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+}
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+
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+static const struct file_operations bcm47xx_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .unlocked_ioctl = bcm47xx_wdt_ioctl,
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+ .open = bcm47xx_wdt_open,
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+ .release = bcm47xx_wdt_release,
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+ .write = bcm47xx_wdt_write,
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+};
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+
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+static struct miscdevice bcm47xx_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &bcm47xx_wdt_fops,
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+};
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+
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+static struct notifier_block bcm47xx_wdt_notifier = {
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+ .notifier_call = bcm47xx_wdt_notify_sys,
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+};
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+
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+static int __init bcm47xx_wdt_init(void)
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+{
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+ int ret;
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+
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+ if (bcm47xx_wdt_hw_stop() < 0)
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+ return -ENODEV;
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+
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+ setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
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+
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+ if (bcm47xx_wdt_settimeout(wdt_time)) {
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+ bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
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+ printk(KERN_INFO DRV_NAME
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+ ": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
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+ wdt_time);
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+ }
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+
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+ ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
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+ if (ret)
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+ return ret;
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+
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+ ret = misc_register(&bcm47xx_wdt_miscdev);
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+ if (ret) {
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+ unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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+ return ret;
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+ }
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+
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+ printk(KERN_INFO "BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
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+ wdt_time, nowayout ? ", nowayout" : "");
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+ return 0;
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+}
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+
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+static void __exit bcm47xx_wdt_exit(void)
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+{
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+ if (!nowayout)
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+ bcm47xx_wdt_stop();
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+
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+ misc_deregister(&bcm47xx_wdt_miscdev);
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+
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+ unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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+}
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+
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+module_init(bcm47xx_wdt_init);
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+module_exit(bcm47xx_wdt_exit);
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+
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+MODULE_AUTHOR("Aleksandar Radovanovic");
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+MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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