mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-21 04:39:54 +02:00
e861730fef
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20204 3c298f89-4303-0410-b956-a3cf2f4a3e73
367 lines
8.5 KiB
Diff
367 lines
8.5 KiB
Diff
--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -113,6 +113,7 @@ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
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obj-$(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_BCM63XX_WDT) += bcm63xx_wdt.o
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# PARISC Architecture
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -850,6 +850,16 @@ config TXX9_WDT
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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 BCM63XX_WDT
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+ tristate "Broadcom BCM63xx hardware watchdog"
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+ depends on BCM63XX
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+ help
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+ Watchdog driver for the built in watchdog hardware in Broadcom
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+ BCM63xx SoC.
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+
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+ To compile thi driver as a loadable module, choose M here.
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+ The module will be called bcm63xx_wdt.
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+
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# PARISC Architecture
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# POWERPC Architecture
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--- /dev/null
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+++ b/drivers/watchdog/bcm63xx_wdt.c
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@@ -0,0 +1,334 @@
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+/*
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+ * Broadcom BCM63xx SoC watchdog driver
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+ *
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+ * Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
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+ * Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
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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/resource.h>
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+#include <linux/platform_device.h>
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+
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+#include <bcm63xx_cpu.h>
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+#include <bcm63xx_io.h>
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+#include <bcm63xx_regs.h>
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+
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+#define PFX KBUILD_MODNAME
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+
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+#define WDT_HZ 50000000 /* Fclk */
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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 struct {
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+ void __iomem *regs;
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+ struct timer_list timer;
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+ int default_ticks;
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+ unsigned long inuse;
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+ atomic_t ticks;
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+} bcm63xx_wdt_device;
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+
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+static int expect_close;
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+static int timeout;
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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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+module_param(nowayout, int, 0);
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+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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+
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+/* HW functions */
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+static void bcm63xx_wdt_hw_start(void)
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+{
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+ bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
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+ bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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+ bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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+}
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+
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+static void bcm63xx_wdt_hw_stop(void)
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+{
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+ bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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+ bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
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+}
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+
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+static void bcm63xx_timer_tick(unsigned long unused)
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+{
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+ if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
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+ bcm63xx_wdt_hw_start();
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+ mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
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+ } else
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+ printk(KERN_CRIT PFX ": watchdog will restart system\n");
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+}
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+
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+static void bcm63xx_wdt_pet(void)
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+{
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+ atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
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+}
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+
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+static void bcm63xx_wdt_start(void)
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+{
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+ bcm63xx_wdt_pet();
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+ bcm63xx_timer_tick(0);
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+}
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+
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+static void bcm63xx_wdt_pause(void)
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+{
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+ del_timer_sync(&bcm63xx_wdt_device.timer);
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+ bcm63xx_wdt_hw_stop();
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+}
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+
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+static int bcm63xx_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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+
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+ return 0;
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+}
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+
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+static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
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+{
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+ if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
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+ return -EBUSY;
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+
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+ bcm63xx_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 bcm63xx_wdt_release(struct inode *inode, struct file *file)
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+{
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+ if (expect_close == 42)
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+ bcm63xx_wdt_pause();
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+ else {
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+ printk(KERN_CRIT PFX
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+ ": Unexpected close, not stopping watchdog!\n");
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+ bcm63xx_wdt_start();
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+ }
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+ clear_bit(0, &bcm63xx_wdt_device.inuse);
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+ expect_close = 0;
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+ return 0;
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+}
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+
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+static ssize_t bcm63xx_wdt_write(struct file *file, const char *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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+ /* In case it was set long ago */
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+ expect_close = 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_close = 42;
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+ }
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+ }
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+ bcm63xx_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 bcm63xx_wdt_info = {
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+ .identity = PFX,
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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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+
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+static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
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+ 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, &bcm63xx_wdt_info,
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+ sizeof(bcm63xx_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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+ bcm63xx_wdt_pause();
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+ retval = 0;
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+ }
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+ if (new_value & WDIOS_ENABLECARD) {
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+ bcm63xx_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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+ bcm63xx_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 (bcm63xx_wdt_settimeout(new_value))
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+ return -EINVAL;
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+
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+ bcm63xx_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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+
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+static int bcm63xx_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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+ bcm63xx_wdt_pause();
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+ return NOTIFY_DONE;
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+}
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+
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+static const struct file_operations bcm63xx_wdt_fops = {
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+ .owner = THIS_MODULE,
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+ .llseek = no_llseek,
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+ .write = bcm63xx_wdt_write,
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+ .unlocked_ioctl = bcm63xx_wdt_ioctl,
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+ .open = bcm63xx_wdt_open,
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+ .release = bcm63xx_wdt_release,
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+};
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+
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+static struct miscdevice bcm63xx_wdt_miscdev = {
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+ .minor = WATCHDOG_MINOR,
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+ .name = "watchdog",
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+ .fops = &bcm63xx_wdt_fops,
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+};
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+
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+static struct notifier_block bcm63xx_wdt_notifier = {
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+ .notifier_call = bcm63xx_wdt_notify_sys,
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+};
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+
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+
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+static int bcm63xx_wdt_probe(struct platform_device *pdev)
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+{
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+ int ret;
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+ struct resource *r;
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+
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+ setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0L);
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+
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+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!r) {
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+ printk(KERN_ERR PFX
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+ "failed to retrieve resources\n");
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+ return -ENODEV;
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+ }
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+
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+ bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
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+ if (!bcm63xx_wdt_device.regs) {
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+ printk(KERN_ERR PFX
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+ "failed to remap I/O resources\n");
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+ return -ENXIO;
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+ }
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+
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+ if (bcm63xx_wdt_settimeout(wdt_time)) {
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+ bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
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+ printk(KERN_INFO PFX
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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(&bcm63xx_wdt_notifier);
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+ if (ret) {
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+ printk(KERN_ERR PFX
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+ "failed to register reboot_notifier\n");
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+ return ret;
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+ }
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+
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+ ret = misc_register(&bcm63xx_wdt_miscdev);
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+ if (ret < 0) {
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+ printk(KERN_ERR PFX
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+ "failed to register watchdog device\n");
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+ goto unmap;
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+ }
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+
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+ printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_DEFAULT_TIME);
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+
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+ return 0;
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+
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+unmap:
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+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
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+ iounmap(bcm63xx_wdt_device.regs);
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+ return ret;
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+}
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+
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+static int bcm63xx_wdt_remove(struct platform_device *pdev)
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+{
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+ if (!nowayout)
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+ bcm63xx_wdt_pause();
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+
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+ misc_deregister(&bcm63xx_wdt_miscdev);
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+
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+ iounmap(bcm63xx_wdt_device.regs);
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+
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+ unregister_reboot_notifier(&bcm63xx_wdt_notifier);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver bcm63xx_wdt = {
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+ .probe = bcm63xx_wdt_probe,
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+ .remove = bcm63xx_wdt_remove,
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+ .driver = {
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+ .name = "bcm63xx-wdt",
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+ }
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+};
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+
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+static int __init bcm63xx_wdt_init(void)
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+{
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+ return platform_driver_register(&bcm63xx_wdt);
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+}
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+
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+static void __exit bcm63xx_wdt_exit(void)
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+{
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+ platform_driver_unregister(&bcm63xx_wdt);
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+}
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+
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+module_init(bcm63xx_wdt_init);
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+module_exit(bcm63xx_wdt_exit);
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+
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+MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
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+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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+MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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+MODULE_ALIAS("platform:bcm63xx-wdt");
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