+++ /dev/null
-From ed8c2d720954efc5a440912292ed11da2f50aaea Mon Sep 17 00:00:00 2001
-From: popcornmix <popcornmix@gmail.com>
-Date: Tue, 17 Jan 2012 19:20:57 +0000
-Subject: [PATCH 3/7] 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(+), 0 deletions(-)
- create mode 100644 drivers/watchdog/bcm2708_wdog.c
-
-diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
-index 86b0735..7675ebc 100644
---- a/drivers/watchdog/Kconfig
-+++ b/drivers/watchdog/Kconfig
-@@ -348,6 +348,12 @@ config IMX2_WDT
- To compile this driver as a module, choose M here: the
- module will be called imx2_wdt.
-
-+config BCM2708_WDT
-+ tristate "BCM2708 Watchdog"
-+ depends on ARCH_BCM2708
-+ help
-+ Enables BCM2708 watchdog support.
-+
- # AVR32 Architecture
-
- config AT32AP700X_WDT
-diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
-index 55bd574..803f0bc 100644
---- a/drivers/watchdog/Makefile
-+++ b/drivers/watchdog/Makefile
-@@ -54,6 +54,7 @@ obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
- obj-$(CONFIG_ADX_WATCHDOG) += adx_wdt.o
- obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
- obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
-+obj-$(CONFIG_BCM2708_WDT) += bcm2708_wdog.o
-
- # AVR32 Architecture
- obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
-diff --git a/drivers/watchdog/bcm2708_wdog.c b/drivers/watchdog/bcm2708_wdog.c
-new file mode 100644
-index 0000000..dd33c35
---- /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");
-+
---
-1.7.5.4
-
projects / openwrt.git / blobdiff