Add bcm63xx_wdt but do not enable it yet

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13677 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 315 insertions, 0 deletions

diff --git a/target/linux/brcm63xx/files/drivers/watchdog/bcm63xx_wdt.c b/target/linux/brcm63xx/files/drivers/watchdog/bcm63xx_wdt.c
new file mode 100644
index 0000000000..b40c52ad96
--- /dev/null
+++ b/target/linux/brcm63xx/files/drivers/watchdog/bcm63xx_wdt.c
@@ -0,0 +1,315 @@
+/*
+ *  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/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/timer.h>
+
+#include <bcm63xx_cpu.h>
+#include <bcm63xx_io.h>
+#include <bcm63xx_regs.h>
+
+#define PFX KBUILD_MODNAME
+
+#define WDT_HZ		50000000 /* Fclk */
+#define WDT_INTERVAL	(40)    /* in seconds */
+
+static struct {
+	void __iomem *regs;
+	struct completion stop;
+	int running;
+	struct timer_list timer;
+	int queue;
+	int default_ticks;
+	unsigned long inuse;
+} bcm63xx_wdt_device;
+
+static int ticks = 100 * WDT_HZ;
+
+static int expect_close;
+static int timeout;
+
+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 void bcm63xx_wdt_toggle(void)
+{
+	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_start(void)
+{
+	if (!bcm63xx_wdt_device.inuse) {
+		bcm63xx_wdt_toggle();
+		mod_timer(&bcm63xx_wdt_device.timer, jiffies + WDT_INTERVAL);
+	}
+
+	bcm63xx_wdt_device.running++;
+}
+
+static void bcm63xx_wdt_stop(void)
+{
+	if (bcm63xx_wdt_device.running) {
+		bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+		bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
+
+		bcm63xx_wdt_device.running = 0;
+	}
+}
+
+static void bcm63xx_wdt_set(int new_timeout)
+{
+	new_timeout *= WDT_HZ;
+	bcm_writel(new_timeout, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
+}
+
+static void bcm63xx_wdt_reset(void)
+{
+	ticks = bcm63xx_wdt_device.default_ticks;
+}
+
+static void bcm63xx_wdt_update(unsigned long unused)
+{
+	if (bcm63xx_wdt_device.running)
+		ticks--;
+
+	bcm63xx_wdt_toggle();
+
+	if (bcm63xx_wdt_device.queue && ticks)
+		mod_timer(&bcm63xx_wdt_device.timer,
+			jiffies + WDT_INTERVAL);
+	else
+		complete(&bcm63xx_wdt_device.stop);
+}
+
+static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
+		return -EBUSY;
+
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	return nonseekable_open(inode, file);
+}
+
+static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
+{
+	if (expect_close && nowayout == 0) {
+		bcm63xx_wdt_stop();
+		printk(KERN_INFO PFX ": disabling watchdog timer\n");
+		module_put(THIS_MODULE);
+	} else
+		printk(KERN_CRIT PFX
+			": device closed unexpectedly. WDT will not stop !\n");
+
+	clear_bit(0, &bcm63xx_wdt_device.inuse);
+	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 = 1;
+			}
+		}
+		bcm63xx_wdt_update(0);
+		return len;
+	}
+	return 0;
+}
+
+static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
+				unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int new_timeout;
+	unsigned int value;
+	static struct watchdog_info ident = {
+		.options =		WDIOF_SETTIMEOUT |
+					WDIOF_KEEPALIVEPING |
+					WDIOF_MAGICCLOSE,
+		.identity =		"BCM63xx Watchdog",
+	};
+	switch (cmd) {
+	case WDIOC_KEEPALIVE:
+		bcm63xx_wdt_reset();
+		break;
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+		value = bcm_readl(bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
+		if (copy_to_user(argp, &value, sizeof(int)))
+			return -EFAULT;
+		break;
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user(argp, &ident, sizeof(ident)))
+			return -EFAULT;
+		break;
+	case WDIOC_SETOPTIONS:
+		if (copy_from_user(&value, argp, sizeof(int)))
+			return -EFAULT;
+		switch (value) {
+		case WDIOS_ENABLECARD:
+			bcm63xx_wdt_start();
+			break;
+		case WDIOS_DISABLECARD:
+			bcm63xx_wdt_stop();
+		default:
+			return -EINVAL;
+		}
+		break;
+	case WDIOC_SETTIMEOUT:
+		if (copy_from_user(&new_timeout, argp, sizeof(int)))
+			return -EFAULT;
+		if (new_timeout < 5)
+			return -EINVAL;
+		if (new_timeout > 40)
+			return -EINVAL;
+		bcm63xx_wdt_set(new_timeout);
+		bcm63xx_wdt_toggle();
+	case WDIOC_GETTIMEOUT:
+		return copy_to_user(argp, &timeout, sizeof(int));
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+static struct file_operations bcm63xx_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= bcm63xx_wdt_write,
+	.unlocked_ioctl	= bcm63xx_wdt_ioctl,
+	.open		= bcm63xx_wdt_open,
+	.release	= bcm63xx_wdt_release,
+};
+
+static struct miscdevice bcm63xx_wdt_miscdev = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &bcm63xx_wdt_fops,
+};
+
+static int bcm63xx_wdt_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct resource *r;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!r) {
+		printk(KERN_ERR PFX 
+			"failed to retrieve resources\n");
+		return -ENODEV;
+	}
+
+	bcm63xx_wdt_device.regs = ioremap_nocache(r->start, r->end - r->start);
+	if (!bcm63xx_wdt_device.regs) {
+		printk(KERN_ERR PFX
+			"failed to remap I/O resources\n");
+		return -ENXIO;
+	}
+
+	ret = misc_register(&bcm63xx_wdt_miscdev);
+	if (ret < 0) {
+		printk(KERN_ERR PFX
+			"failed to register watchdog device\n");
+		goto unmap;
+	}
+
+	init_completion(&bcm63xx_wdt_device.stop);
+	bcm63xx_wdt_device.queue = 0;
+
+	clear_bit(0, &bcm63xx_wdt_device.inuse);
+
+	setup_timer(&bcm63xx_wdt_device.timer, bcm63xx_wdt_update, 0L);
+
+	bcm63xx_wdt_device.default_ticks = ticks;
+	bcm63xx_wdt_set(ticks);
+	bcm63xx_wdt_start();
+	
+	printk(KERN_INFO PFX " started, timer margin: %d sec\n", WDT_INTERVAL);
+
+	return 0;
+
+unmap:
+	iounmap(bcm63xx_wdt_device.regs);
+	return ret;
+}
+
+static int bcm63xx_wdt_remove(struct platform_device *pdev)
+{
+	if (bcm63xx_wdt_device.queue) {
+		bcm63xx_wdt_device.queue = 0;
+		wait_for_completion(&bcm63xx_wdt_device.stop);
+	}
+
+	misc_deregister(&bcm63xx_wdt_miscdev);
+
+	iounmap(bcm63xx_wdt_device.regs);
+
+	return 0;
+}
+
+static struct platform_driver bcm63xx_wdt = {
+	.probe	= bcm63xx_wdt_probe,
+	.remove = bcm63xx_wdt_remove,
+	.driver = {
+		.name = "bcm63xx-wdt",
+	}
+};
+
+static int __init bcm63xx_wdt_init(void)
+{
+	return platform_driver_register(&bcm63xx_wdt);
+}
+
+static void __exit bcm63xx_wdt_exit(void)
+{
+	platform_driver_unregister(&bcm63xx_wdt);
+}
+
+module_init(bcm63xx_wdt_init);
+module_exit(bcm63xx_wdt_exit);
+
+MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS("platform:bcm63xx-wdt");