mv watchdog tree under drivers

move watchdog tree from drivers/char/watchdog to drivers/watchdog.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 194 insertions, 0 deletions

diff --git a/drivers/watchdog/booke_wdt.c b/drivers/watchdog/booke_wdt.c
new file mode 100644
index 00000000000..d362f5bf658
--- /dev/null
+++ b/drivers/watchdog/booke_wdt.c
@@ -0,0 +1,194 @@
+/*
+ * drivers/char/watchdog/booke_wdt.c
+ *
+ * Watchdog timer for PowerPC Book-E systems
+ *
+ * Author: Matthew McClintock
+ * Maintainer: Kumar Gala <galak@kernel.crashing.org>
+ *
+ * Copyright 2005 Freescale Semiconductor Inc.
+ *
+ * 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/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/notifier.h>
+#include <linux/watchdog.h>
+
+#include <asm/reg_booke.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/* If the kernel parameter wdt=1, the watchdog will be enabled at boot.
+ * Also, the wdt_period sets the watchdog timer period timeout.
+ * For E500 cpus the wdt_period sets which bit changing from 0->1 will
+ * trigger a watchog timeout. This watchdog timeout will occur 3 times, the
+ * first time nothing will happen, the second time a watchdog exception will
+ * occur, and the final time the board will reset.
+ */
+
+#ifdef	CONFIG_FSL_BOOKE
+#define WDT_PERIOD_DEFAULT 63	/* Ex. wdt_period=28 bus=333Mhz , reset=~40sec */
+#else
+#define WDT_PERIOD_DEFAULT 3	/* Refer to the PPC40x and PPC4xx manuals */
+#endif				/* for timing information */
+
+u32 booke_wdt_enabled = 0;
+u32 booke_wdt_period = WDT_PERIOD_DEFAULT;
+
+#ifdef	CONFIG_FSL_BOOKE
+#define WDTP(x)		((((63-x)&0x3)<<30)|(((63-x)&0x3c)<<15))
+#else
+#define WDTP(x)		(TCR_WP(x))
+#endif
+
+/*
+ * booke_wdt_ping:
+ */
+static __inline__ void booke_wdt_ping(void)
+{
+	mtspr(SPRN_TSR, TSR_ENW|TSR_WIS);
+}
+
+/*
+ * booke_wdt_enable:
+ */
+static __inline__ void booke_wdt_enable(void)
+{
+	u32 val;
+
+	/* clear status before enabling watchdog */
+	booke_wdt_ping();
+	val = mfspr(SPRN_TCR);
+	val |= (TCR_WIE|TCR_WRC(WRC_CHIP)|WDTP(booke_wdt_period));
+
+	mtspr(SPRN_TCR, val);
+}
+
+/*
+ * booke_wdt_write:
+ */
+static ssize_t booke_wdt_write (struct file *file, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	booke_wdt_ping();
+	return count;
+}
+
+static struct watchdog_info ident = {
+  .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+  .firmware_version = 0,
+  .identity = "PowerPC Book-E Watchdog",
+};
+
+/*
+ * booke_wdt_ioctl:
+ */
+static int booke_wdt_ioctl (struct inode *inode, struct file *file,
+			    unsigned int cmd, unsigned long arg)
+{
+	u32 tmp = 0;
+	u32 __user *p = (u32 __user *)arg;
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+		if (copy_to_user ((struct watchdog_info __user *) arg, &ident,
+				sizeof(struct watchdog_info)))
+			return -EFAULT;
+	case WDIOC_GETSTATUS:
+		return put_user(ident.options, p);
+	case WDIOC_GETBOOTSTATUS:
+		/* XXX: something is clearing TSR */
+		tmp = mfspr(SPRN_TSR) & TSR_WRS(3);
+		/* returns 1 if last reset was caused by the WDT */
+		return (tmp ? 1 : 0);
+	case WDIOC_KEEPALIVE:
+		booke_wdt_ping();
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(booke_wdt_period, p))
+			return -EFAULT;
+		mtspr(SPRN_TCR, (mfspr(SPRN_TCR)&~WDTP(0))|WDTP(booke_wdt_period));
+		return 0;
+	case WDIOC_GETTIMEOUT:
+		return put_user(booke_wdt_period, p);
+	case WDIOC_SETOPTIONS:
+		if (get_user(tmp, p))
+			return -EINVAL;
+		if (tmp == WDIOS_ENABLECARD) {
+			booke_wdt_ping();
+			break;
+		} else
+			return -EINVAL;
+		return 0;
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+/*
+ * booke_wdt_open:
+ */
+static int booke_wdt_open (struct inode *inode, struct file *file)
+{
+	if (booke_wdt_enabled == 0) {
+		booke_wdt_enabled = 1;
+		booke_wdt_enable();
+		printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n",
+				booke_wdt_period);
+	}
+
+	return nonseekable_open(inode, file);
+}
+
+static const struct file_operations booke_wdt_fops = {
+  .owner = THIS_MODULE,
+  .llseek = no_llseek,
+  .write = booke_wdt_write,
+  .ioctl = booke_wdt_ioctl,
+  .open = booke_wdt_open,
+};
+
+static struct miscdevice booke_wdt_miscdev = {
+  .minor = WATCHDOG_MINOR,
+  .name = "watchdog",
+  .fops = &booke_wdt_fops,
+};
+
+static void __exit booke_wdt_exit(void)
+{
+	misc_deregister(&booke_wdt_miscdev);
+}
+
+/*
+ * booke_wdt_init:
+ */
+static int __init booke_wdt_init(void)
+{
+	int ret = 0;
+
+	printk (KERN_INFO "PowerPC Book-E Watchdog Timer Loaded\n");
+	ident.firmware_version = cur_cpu_spec->pvr_value;
+
+	ret = misc_register(&booke_wdt_miscdev);
+	if (ret) {
+		printk (KERN_CRIT "Cannot register miscdev on minor=%d (err=%d)\n",
+				WATCHDOG_MINOR, ret);
+		return ret;
+	}
+
+	if (booke_wdt_enabled == 1) {
+		printk (KERN_INFO "PowerPC Book-E Watchdog Timer Enabled (wdt_period=%d)\n",
+				booke_wdt_period);
+		booke_wdt_enable();
+	}
+
+	return ret;
+}
+device_initcall(booke_wdt_init);