mirror of https://github.com/hak5/openwrt.git
427 lines
10 KiB
Diff
427 lines
10 KiB
Diff
From dd611b3364087514ef5fc59c6106d8924d2a2a30 Mon Sep 17 00:00:00 2001
|
|
From: popcornmix <popcornmix@gmail.com>
|
|
Date: Wed, 1 May 2013 19:54:32 +0100
|
|
Subject: [PATCH 003/174] bcm2708 watchdog driver
|
|
|
|
Signed-off-by: popcornmix <popcornmix@gmail.com>
|
|
---
|
|
drivers/watchdog/Kconfig | 6 +
|
|
drivers/watchdog/Makefile | 1 +
|
|
drivers/watchdog/bcm2708_wdog.c | 385 ++++++++++++++++++++++++++++++++++++++++
|
|
3 files changed, 392 insertions(+)
|
|
create mode 100644 drivers/watchdog/bcm2708_wdog.c
|
|
|
|
--- a/drivers/watchdog/Kconfig
|
|
+++ b/drivers/watchdog/Kconfig
|
|
@@ -391,6 +391,12 @@ config RETU_WATCHDOG
|
|
To compile this driver as a module, choose M here: the
|
|
module will be called retu_wdt.
|
|
|
|
+config BCM2708_WDT
|
|
+ tristate "BCM2708 Watchdog"
|
|
+ depends on ARCH_BCM2708
|
|
+ help
|
|
+ Enables BCM2708 watchdog support.
|
|
+
|
|
# AVR32 Architecture
|
|
|
|
config AT32AP700X_WDT
|
|
--- a/drivers/watchdog/Makefile
|
|
+++ b/drivers/watchdog/Makefile
|
|
@@ -54,6 +54,7 @@ obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_
|
|
obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
|
|
obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
|
|
obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
|
|
+obj-$(CONFIG_BCM2708_WDT) += bcm2708_wdog.o
|
|
|
|
# AVR32 Architecture
|
|
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
|
|
--- /dev/null
|
|
+++ b/drivers/watchdog/bcm2708_wdog.c
|
|
@@ -0,0 +1,385 @@
|
|
+/*
|
|
+ * Broadcom BCM2708 watchdog driver.
|
|
+ *
|
|
+ * (c) Copyright 2010 Broadcom Europe Ltd
|
|
+ *
|
|
+ * 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.
|
|
+ *
|
|
+ * BCM2708 watchdog driver. Loosely based on wdt driver.
|
|
+ */
|
|
+
|
|
+#include <linux/interrupt.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/moduleparam.h>
|
|
+#include <linux/types.h>
|
|
+#include <linux/miscdevice.h>
|
|
+#include <linux/watchdog.h>
|
|
+#include <linux/fs.h>
|
|
+#include <linux/ioport.h>
|
|
+#include <linux/notifier.h>
|
|
+#include <linux/reboot.h>
|
|
+#include <linux/init.h>
|
|
+#include <linux/io.h>
|
|
+#include <linux/uaccess.h>
|
|
+#include <mach/platform.h>
|
|
+
|
|
+#include <asm/system.h>
|
|
+
|
|
+#define SECS_TO_WDOG_TICKS(x) ((x) << 16)
|
|
+#define WDOG_TICKS_TO_SECS(x) ((x) >> 16)
|
|
+
|
|
+static unsigned long wdog_is_open;
|
|
+static uint32_t wdog_ticks; /* Ticks to load into wdog timer */
|
|
+static char expect_close;
|
|
+
|
|
+/*
|
|
+ * Module parameters
|
|
+ */
|
|
+
|
|
+#define WD_TIMO 10 /* Default heartbeat = 60 seconds */
|
|
+static int heartbeat = WD_TIMO; /* Heartbeat in seconds */
|
|
+
|
|
+module_param(heartbeat, int, 0);
|
|
+MODULE_PARM_DESC(heartbeat,
|
|
+ "Watchdog heartbeat in seconds. (0 < heartbeat < 65536, default="
|
|
+ __MODULE_STRING(WD_TIMO) ")");
|
|
+
|
|
+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) ")");
|
|
+
|
|
+static DEFINE_SPINLOCK(wdog_lock);
|
|
+
|
|
+/**
|
|
+ * Start the watchdog driver.
|
|
+ */
|
|
+
|
|
+static int wdog_start(unsigned long timeout)
|
|
+{
|
|
+ uint32_t cur;
|
|
+ unsigned long flags;
|
|
+ spin_lock_irqsave(&wdog_lock, flags);
|
|
+
|
|
+ /* enable the watchdog */
|
|
+ iowrite32(PM_PASSWORD | (timeout & PM_WDOG_TIME_SET),
|
|
+ __io_address(PM_WDOG));
|
|
+ cur = ioread32(__io_address(PM_RSTC));
|
|
+ iowrite32(PM_PASSWORD | (cur & PM_RSTC_WRCFG_CLR) |
|
|
+ PM_RSTC_WRCFG_FULL_RESET, __io_address(PM_RSTC));
|
|
+
|
|
+ spin_unlock_irqrestore(&wdog_lock, flags);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * Stop the watchdog driver.
|
|
+ */
|
|
+
|
|
+static int wdog_stop(void)
|
|
+{
|
|
+ iowrite32(PM_PASSWORD | PM_RSTC_RESET, __io_address(PM_RSTC));
|
|
+ printk(KERN_INFO "watchdog stopped\n");
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * Reload counter one with the watchdog heartbeat. We don't bother
|
|
+ * reloading the cascade counter.
|
|
+ */
|
|
+
|
|
+static void wdog_ping(void)
|
|
+{
|
|
+ wdog_start(wdog_ticks);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @t: the new heartbeat value that needs to be set.
|
|
+ *
|
|
+ * Set a new heartbeat value for the watchdog device. If the heartbeat
|
|
+ * value is incorrect we keep the old value and return -EINVAL. If
|
|
+ * successful we return 0.
|
|
+ */
|
|
+
|
|
+static int wdog_set_heartbeat(int t)
|
|
+{
|
|
+ if (t < 1 || t > WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET))
|
|
+ return -EINVAL;
|
|
+
|
|
+ heartbeat = t;
|
|
+ wdog_ticks = SECS_TO_WDOG_TICKS(t);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @file: file handle to the watchdog
|
|
+ * @buf: buffer to write (unused as data does not matter here
|
|
+ * @count: count of bytes
|
|
+ * @ppos: pointer to the position to write. No seeks allowed
|
|
+ *
|
|
+ * A write to a watchdog device is defined as a keepalive signal.
|
|
+ *
|
|
+ * if 'nowayout' is set then normally a close() is ignored. But
|
|
+ * if you write 'V' first then the close() will stop the timer.
|
|
+ */
|
|
+
|
|
+static ssize_t wdog_write(struct file *file, const char __user *buf,
|
|
+ size_t count, loff_t *ppos)
|
|
+{
|
|
+ if (count) {
|
|
+ if (!nowayout) {
|
|
+ size_t i;
|
|
+
|
|
+ /* In case it was set long ago */
|
|
+ expect_close = 0;
|
|
+
|
|
+ for (i = 0; i != count; i++) {
|
|
+ char c;
|
|
+ if (get_user(c, buf + i))
|
|
+ return -EFAULT;
|
|
+ if (c == 'V')
|
|
+ expect_close = 42;
|
|
+ }
|
|
+ }
|
|
+ wdog_ping();
|
|
+ }
|
|
+ return count;
|
|
+}
|
|
+
|
|
+static int wdog_get_status(void)
|
|
+{
|
|
+ unsigned long flags;
|
|
+ int status = 0;
|
|
+ spin_lock_irqsave(&wdog_lock, flags);
|
|
+ /* FIXME: readback reset reason */
|
|
+ spin_unlock_irqrestore(&wdog_lock, flags);
|
|
+ return status;
|
|
+}
|
|
+
|
|
+static uint32_t wdog_get_remaining(void)
|
|
+{
|
|
+ uint32_t ret = ioread32(__io_address(PM_WDOG));
|
|
+ return ret & PM_WDOG_TIME_SET;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @file: file handle to the device
|
|
+ * @cmd: watchdog command
|
|
+ * @arg: argument pointer
|
|
+ *
|
|
+ * The watchdog API defines a common set of functions for all watchdogs
|
|
+ * according to their available features. We only actually usefully support
|
|
+ * querying capabilities and current status.
|
|
+ */
|
|
+
|
|
+static long wdog_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
+{
|
|
+ void __user *argp = (void __user *)arg;
|
|
+ int __user *p = argp;
|
|
+ int new_heartbeat;
|
|
+ int status;
|
|
+ int options;
|
|
+ uint32_t remaining;
|
|
+
|
|
+ struct watchdog_info ident = {
|
|
+ .options = WDIOF_SETTIMEOUT|
|
|
+ WDIOF_MAGICCLOSE|
|
|
+ WDIOF_KEEPALIVEPING,
|
|
+ .firmware_version = 1,
|
|
+ .identity = "BCM2708",
|
|
+ };
|
|
+
|
|
+ switch (cmd) {
|
|
+ case WDIOC_GETSUPPORT:
|
|
+ return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
|
|
+ case WDIOC_GETSTATUS:
|
|
+ status = wdog_get_status();
|
|
+ return put_user(status, p);
|
|
+ case WDIOC_GETBOOTSTATUS:
|
|
+ return put_user(0, p);
|
|
+ case WDIOC_KEEPALIVE:
|
|
+ wdog_ping();
|
|
+ return 0;
|
|
+ case WDIOC_SETTIMEOUT:
|
|
+ if (get_user(new_heartbeat, p))
|
|
+ return -EFAULT;
|
|
+ if (wdog_set_heartbeat(new_heartbeat))
|
|
+ return -EINVAL;
|
|
+ wdog_ping();
|
|
+ /* Fall */
|
|
+ case WDIOC_GETTIMEOUT:
|
|
+ return put_user(heartbeat, p);
|
|
+ case WDIOC_GETTIMELEFT:
|
|
+ remaining = WDOG_TICKS_TO_SECS(wdog_get_remaining());
|
|
+ return put_user(remaining, p);
|
|
+ case WDIOC_SETOPTIONS:
|
|
+ if (get_user(options, p))
|
|
+ return -EFAULT;
|
|
+ if (options & WDIOS_DISABLECARD)
|
|
+ wdog_stop();
|
|
+ if (options & WDIOS_ENABLECARD)
|
|
+ wdog_start(wdog_ticks);
|
|
+ return 0;
|
|
+ default:
|
|
+ return -ENOTTY;
|
|
+ }
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @inode: inode of device
|
|
+ * @file: file handle to device
|
|
+ *
|
|
+ * The watchdog device has been opened. The watchdog device is single
|
|
+ * open and on opening we load the counters.
|
|
+ */
|
|
+
|
|
+static int wdog_open(struct inode *inode, struct file *file)
|
|
+{
|
|
+ if (test_and_set_bit(0, &wdog_is_open))
|
|
+ return -EBUSY;
|
|
+ /*
|
|
+ * Activate
|
|
+ */
|
|
+ wdog_start(wdog_ticks);
|
|
+ return nonseekable_open(inode, file);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @inode: inode to board
|
|
+ * @file: file handle to board
|
|
+ *
|
|
+ * The watchdog has a configurable API. There is a religious dispute
|
|
+ * between people who want their watchdog to be able to shut down and
|
|
+ * those who want to be sure if the watchdog manager dies the machine
|
|
+ * reboots. In the former case we disable the counters, in the latter
|
|
+ * case you have to open it again very soon.
|
|
+ */
|
|
+
|
|
+static int wdog_release(struct inode *inode, struct file *file)
|
|
+{
|
|
+ if (expect_close == 42) {
|
|
+ wdog_stop();
|
|
+ } else {
|
|
+ printk(KERN_CRIT
|
|
+ "wdt: WDT device closed unexpectedly. WDT will not stop!\n");
|
|
+ wdog_ping();
|
|
+ }
|
|
+ clear_bit(0, &wdog_is_open);
|
|
+ expect_close = 0;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * @this: our notifier block
|
|
+ * @code: the event being reported
|
|
+ * @unused: unused
|
|
+ *
|
|
+ * Our notifier is called on system shutdowns. Turn the watchdog
|
|
+ * off so that it does not fire during the next reboot.
|
|
+ */
|
|
+
|
|
+static int wdog_notify_sys(struct notifier_block *this, unsigned long code,
|
|
+ void *unused)
|
|
+{
|
|
+ if (code == SYS_DOWN || code == SYS_HALT)
|
|
+ wdog_stop();
|
|
+ return NOTIFY_DONE;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Kernel Interfaces
|
|
+ */
|
|
+
|
|
+
|
|
+static const struct file_operations wdog_fops = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .llseek = no_llseek,
|
|
+ .write = wdog_write,
|
|
+ .unlocked_ioctl = wdog_ioctl,
|
|
+ .open = wdog_open,
|
|
+ .release = wdog_release,
|
|
+};
|
|
+
|
|
+static struct miscdevice wdog_miscdev = {
|
|
+ .minor = WATCHDOG_MINOR,
|
|
+ .name = "watchdog",
|
|
+ .fops = &wdog_fops,
|
|
+};
|
|
+
|
|
+/*
|
|
+ * The WDT card needs to learn about soft shutdowns in order to
|
|
+ * turn the timebomb registers off.
|
|
+ */
|
|
+
|
|
+static struct notifier_block wdog_notifier = {
|
|
+ .notifier_call = wdog_notify_sys,
|
|
+};
|
|
+
|
|
+/**
|
|
+ * cleanup_module:
|
|
+ *
|
|
+ * Unload the watchdog. You cannot do this with any file handles open.
|
|
+ * If your watchdog is set to continue ticking on close and you unload
|
|
+ * it, well it keeps ticking. We won't get the interrupt but the board
|
|
+ * will not touch PC memory so all is fine. You just have to load a new
|
|
+ * module in 60 seconds or reboot.
|
|
+ */
|
|
+
|
|
+static void __exit wdog_exit(void)
|
|
+{
|
|
+ misc_deregister(&wdog_miscdev);
|
|
+ unregister_reboot_notifier(&wdog_notifier);
|
|
+}
|
|
+
|
|
+static int __init wdog_init(void)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ /* Check that the heartbeat value is within it's range;
|
|
+ if not reset to the default */
|
|
+ if (wdog_set_heartbeat(heartbeat)) {
|
|
+ wdog_set_heartbeat(WD_TIMO);
|
|
+ printk(KERN_INFO "bcm2708_wdog: heartbeat value must be "
|
|
+ "0 < heartbeat < %d, using %d\n",
|
|
+ WDOG_TICKS_TO_SECS(PM_WDOG_TIME_SET),
|
|
+ WD_TIMO);
|
|
+ }
|
|
+
|
|
+ ret = register_reboot_notifier(&wdog_notifier);
|
|
+ if (ret) {
|
|
+ printk(KERN_ERR
|
|
+ "wdt: cannot register reboot notifier (err=%d)\n", ret);
|
|
+ goto out_reboot;
|
|
+ }
|
|
+
|
|
+ ret = misc_register(&wdog_miscdev);
|
|
+ if (ret) {
|
|
+ printk(KERN_ERR
|
|
+ "wdt: cannot register miscdev on minor=%d (err=%d)\n",
|
|
+ WATCHDOG_MINOR, ret);
|
|
+ goto out_misc;
|
|
+ }
|
|
+
|
|
+ printk(KERN_INFO "bcm2708 watchdog, heartbeat=%d sec (nowayout=%d)\n",
|
|
+ heartbeat, nowayout);
|
|
+ return 0;
|
|
+
|
|
+out_misc:
|
|
+ unregister_reboot_notifier(&wdog_notifier);
|
|
+out_reboot:
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+module_init(wdog_init);
|
|
+module_exit(wdog_exit);
|
|
+
|
|
+MODULE_AUTHOR("Luke Diamand");
|
|
+MODULE_DESCRIPTION("Driver for BCM2708 watchdog");
|
|
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);
|
|
+MODULE_LICENSE("GPL");
|
|
+
|