3 files changed, 361 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 57b8a410697b..4a291045ebac 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -917,6 +917,16 @@ config OCTEON_WDT
           from the first interrupt, it is then only poked when the
           device is written.
 
+config BCM63XX_WDT
+        tristate "Broadcom BCM63xx hardware watchdog"
+        depends on BCM63XX
+        help
+          Watchdog driver for the built in watchdog hardware in Broadcom
+          BCM63xx SoC.
+
+          To compile this driver as a loadable module, choose M here.
+          The module will be called bcm63xx_wdt.
+
 # PARISC Architecture
 
 # POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 8374503fcc6a..4b0ef386229d 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
 
 # MIPS Architecture
 obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
+obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
diff --git a/drivers/watchdog/bcm63xx_wdt.c b/drivers/watchdog/bcm63xx_wdt.c
new file mode 100644
index 000000000000..a1debc89356b
--- /dev/null
+++ b/drivers/watchdog/bcm63xx_wdt.c
@@ -0,0 +1,350 @@
+/*
+ *  Broadcom BCM63xx SoC watchdog driver
+ *
+ *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
+ *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
+ *
+ *  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.
+ */
+
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/resource.h>
+#include <linux/platform_device.h>
+
+#include <bcm63xx_cpu.h>
+#include <bcm63xx_io.h>
+#include <bcm63xx_regs.h>
+#include <bcm63xx_timer.h>
+
+#define PFX KBUILD_MODNAME
+
+#define WDT_HZ          50000000 /* Fclk */
+#define WDT_DEFAULT_TIME        30      /* seconds */
+#define WDT_MAX_TIME            256     /* seconds */
+
+static struct {
+        void __iomem *regs;
+        struct timer_list timer;
+        int default_ticks;
+        unsigned long inuse;
+        atomic_t ticks;
+} bcm63xx_wdt_device;
+
+static int expect_close;
+
+static int wdt_time = WDT_DEFAULT_TIME;
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+        __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/* HW functions */
+static void bcm63xx_wdt_hw_start(void)
+{
+        bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
+        bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+        bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+}
+
+static void bcm63xx_wdt_hw_stop(void)
+{
+        bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+        bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+}
+
+static void bcm63xx_wdt_isr(void *data)
+{
+        struct pt_regs *regs = get_irq_regs();
+
+        die(PFX " fire", regs);
+}
+
+static void bcm63xx_timer_tick(unsigned long unused)
+{
+        if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
+                bcm63xx_wdt_hw_start();
+                mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
+        } else
+                printk(KERN_CRIT PFX ": watchdog will restart system\n");
+}
+
+static void bcm63xx_wdt_pet(void)
+{
+        atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
+}
+
+static void bcm63xx_wdt_start(void)
+{
+        bcm63xx_wdt_pet();
+        bcm63xx_timer_tick(0);
+}
+
+static void bcm63xx_wdt_pause(void)
+{
+        del_timer_sync(&bcm63xx_wdt_device.timer);
+        bcm63xx_wdt_hw_stop();
+}
+
+static int bcm63xx_wdt_settimeout(int new_time)
+{
+        if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
+                return -EINVAL;
+
+        wdt_time = new_time;
+
+        return 0;
+}
+
+static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
+{
+        if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
+                return -EBUSY;
+
+        bcm63xx_wdt_start();
+        return nonseekable_open(inode, file);
+}
+
+static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
+{
+        if (expect_close == 42)
+                bcm63xx_wdt_pause();
+        else {
+                printk(KERN_CRIT PFX
+                        ": Unexpected close, not stopping watchdog!\n");
+                bcm63xx_wdt_start();
+        }
+        clear_bit(0, &bcm63xx_wdt_device.inuse);
+        expect_close = 0;
+        return 0;
+}
+
+static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
+                                size_t len, loff_t *ppos)
+{
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* In case it was set long ago */
+                        expect_close = 0;
+
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if (get_user(c, data + i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+                bcm63xx_wdt_pet();
+        }
+        return len;
+}
+
+static struct watchdog_info bcm63xx_wdt_info = {
+        .identity       = PFX,
+        .options        = WDIOF_SETTIMEOUT |
+                                WDIOF_KEEPALIVEPING |
+                                WDIOF_MAGICCLOSE,
+};