Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 into devel

Conflicts:

	arch/arm/mach-at91/gpio.c

1 files changed, 69 insertions, 99 deletions

diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index 57027f4653ce..f3553fa40b17 100644
--- a/drivers/watchdog/rc32434_wdt.c
+++ b/drivers/watchdog/rc32434_wdt.c
@@ -34,104 +34,89 @@
 #include <asm/time.h>
 #include <asm/mach-rc32434/integ.h>
 
-#define MAX_TIMEOUT			20
-#define RC32434_WDT_INTERVAL		(15 * HZ)
-
-#define VERSION "0.2"
+#define VERSION "0.4"
 
 static struct {
-	struct completion stop;
-	int running;
-	struct timer_list timer;
-	int queue;
-	int default_ticks;
 	unsigned long inuse;
 } rc32434_wdt_device;
 
 static struct integ __iomem *wdt_reg;
-static int ticks = 100 * HZ;
 
 static int expect_close;
-static int timeout;
+
+/* Board internal clock speed in Hz,
+ * the watchdog timer ticks at. */
+extern unsigned int idt_cpu_freq;
+
+/* translate wtcompare value to seconds and vice versa */
+#define WTCOMP2SEC(x)	(x / idt_cpu_freq)
+#define SEC2WTCOMP(x)	(x * idt_cpu_freq)
+
+/* Use a default timeout of 20s. This should be
+ * safe for CPU clock speeds up to 400MHz, as
+ * ((2 ^ 32) - 1) / (400MHz / 2) = 21s.  */
+#define WATCHDOG_TIMEOUT 20
+
+static int timeout = WATCHDOG_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) ")");
 
+/* apply or and nand masks to data read from addr and write back */
+#define SET_BITS(addr, or, nand) \
+	writel((readl(&addr) | or) & ~nand, &addr)
 
 static void rc32434_wdt_start(void)
 {
-	u32 val;
-
-	if (!rc32434_wdt_device.inuse) {
-		writel(0, &wdt_reg->wtcount);
+	u32 or, nand;
 
-		val = RC32434_ERR_WRE;
-		writel(readl(&wdt_reg->errcs) | val, &wdt_reg->errcs);
+	/* zero the counter before enabling */
+	writel(0, &wdt_reg->wtcount);
 
-		val = RC32434_WTC_EN;
-		writel(readl(&wdt_reg->wtc) | val, &wdt_reg->wtc);
-	}
-	rc32434_wdt_device.running++;
-}
+	/* don't generate a non-maskable interrupt,
+	 * do a warm reset instead */
+	nand = 1 << RC32434_ERR_WNE;
+	or = 1 << RC32434_ERR_WRE;
 
-static void rc32434_wdt_stop(void)
-{
-	u32 val;
+	/* reset the ERRCS timeout bit in case it's set */
+	nand |= 1 << RC32434_ERR_WTO;
 
-	if (rc32434_wdt_device.running) {
+	SET_BITS(wdt_reg->errcs, or, nand);
 
-		val = ~RC32434_WTC_EN;
-		writel(readl(&wdt_reg->wtc) & val, &wdt_reg->wtc);
+	/* reset WTC timeout bit and enable WDT */
+	nand = 1 << RC32434_WTC_TO;
+	or = 1 << RC32434_WTC_EN;
 
-		val = ~RC32434_ERR_WRE;
-		writel(readl(&wdt_reg->errcs) & val, &wdt_reg->errcs);
+	SET_BITS(wdt_reg->wtc, or, nand);
+}
 
-		rc32434_wdt_device.running = 0;
-	}
+static void rc32434_wdt_stop(void)
+{
+	/* Disable WDT */
+	SET_BITS(wdt_reg->wtc, 0, 1 << RC32434_WTC_EN);
 }
 
-static void rc32434_wdt_set(int new_timeout)
+static int rc32434_wdt_set(int new_timeout)
 {
-	u32 cmp = new_timeout * HZ;
-	u32 state, val;
+	int max_to = WTCOMP2SEC((u32)-1);
 
+	if (new_timeout < 0 || new_timeout > max_to) {
+		printk(KERN_ERR KBUILD_MODNAME
+			": timeout value must be between 0 and %d",
+			max_to);
+		return -EINVAL;
+	}
 	timeout = new_timeout;
-	/*
-	 * store and disable WTC
-	 */
-	state = (u32)(readl(&wdt_reg->wtc) & RC32434_WTC_EN);
-	val = ~RC32434_WTC_EN;
-	writel(readl(&wdt_reg->wtc) & val, &wdt_reg->wtc);
-
-	writel(0, &wdt_reg->wtcount);
-	writel(cmp, &wdt_reg->wtcompare);
-
-	/*
-	 * restore WTC
-	 */
-
-	writel(readl(&wdt_reg->wtc) | state, &wdt_reg);
-}
+	writel(SEC2WTCOMP(timeout), &wdt_reg->wtcompare);
 
-static void rc32434_wdt_reset(void)
-{
-	ticks = rc32434_wdt_device.default_ticks;
+	return 0;
 }
 
-static void rc32434_wdt_update(unsigned long unused)
+static void rc32434_wdt_ping(void)
 {
-	if (rc32434_wdt_device.running)
-		ticks--;
-
 	writel(0, &wdt_reg->wtcount);
-
-	if (rc32434_wdt_device.queue && ticks)
-		mod_timer(&rc32434_wdt_device.timer,
-			jiffies + RC32434_WDT_INTERVAL);
-	else
-		complete(&rc32434_wdt_device.stop);
 }
 
 static int rc32434_wdt_open(struct inode *inode, struct file *file)
@@ -142,19 +127,23 @@ static int rc32434_wdt_open(struct inode *inode, struct file *file)
 	if (nowayout)
 		__module_get(THIS_MODULE);
 
+	rc32434_wdt_start();
+	rc32434_wdt_ping();
+
 	return nonseekable_open(inode, file);
 }
 
 static int rc32434_wdt_release(struct inode *inode, struct file *file)
 {
-	if (expect_close && nowayout == 0) {
+	if (expect_close == 42) {
 		rc32434_wdt_stop();
 		printk(KERN_INFO KBUILD_MODNAME ": disabling watchdog timer\n");
 		module_put(THIS_MODULE);
-	} else
+	} else {
 		printk(KERN_CRIT KBUILD_MODNAME
 			": device closed unexpectedly. WDT will not stop !\n");
-
+		rc32434_wdt_ping();
+	}
 	clear_bit(0, &rc32434_wdt_device.inuse);
 	return 0;
 }
@@ -174,10 +163,10 @@ static ssize_t rc32434_wdt_write(struct file *file, const char *data,
 				if (get_user(c, data + i))
 					return -EFAULT;
 				if (c == 'V')
-					expect_close = 1;
+					expect_close = 42;
 			}
 		}
-		rc32434_wdt_update(0);
+		rc32434_wdt_ping();
 		return len;
 	}
 	return 0;
@@ -197,11 +186,11 @@ static long rc32434_wdt_ioctl(struct file *file, unsigned int cmd,
 	};
 	switch (cmd) {
 	case WDIOC_KEEPALIVE:
-		rc32434_wdt_reset();
+		rc32434_wdt_ping();
 		break;
 	case WDIOC_GETSTATUS:
 	case WDIOC_GETBOOTSTATUS:
-		value = readl(&wdt_reg->wtcount);
+		value = 0;
 		if (copy_to_user(argp, &value, sizeof(int)))
 			return -EFAULT;
 		break;
@@ -218,6 +207,7 @@ static long rc32434_wdt_ioctl(struct file *file, unsigned int cmd,
 			break;
 		case WDIOS_DISABLECARD:
 			rc32434_wdt_stop();
+			break;
 		default:
 			return -EINVAL;
 		}
@@ -225,11 +215,9 @@ static long rc32434_wdt_ioctl(struct file *file, unsigned int cmd,
 	case WDIOC_SETTIMEOUT:
 		if (copy_from_user(&new_timeout, argp, sizeof(int)))
 			return -EFAULT;
-		if (new_timeout < 1)
+		if (rc32434_wdt_set(new_timeout))
 			return -EINVAL;
-		if (new_timeout > MAX_TIMEOUT)
-			return -EINVAL;
-		rc32434_wdt_set(new_timeout);
+		/* Fall through */
 	case WDIOC_GETTIMEOUT:
 		return copy_to_user(argp, &timeout, sizeof(int));
 	default:
@@ -254,15 +242,15 @@ static struct miscdevice rc32434_wdt_miscdev = {
 	.fops	= &rc32434_wdt_fops,
 };
 
-static char banner[] = KERN_INFO KBUILD_MODNAME
+static char banner[] __devinitdata = KERN_INFO KBUILD_MODNAME
 		": Watchdog Timer version " VERSION ", timer margin: %d sec\n";
 
-static int rc32434_wdt_probe(struct platform_device *pdev)
+static int __devinit rc32434_wdt_probe(struct platform_device *pdev)
 {
 	int ret;
 	struct resource *r;
 
-	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rb500_wdt_res");
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rb532_wdt_res");
 	if (!r) {
 		printk(KERN_ERR KBUILD_MODNAME
 			"failed to retrieve resources\n");
@@ -277,24 +265,12 @@ static int rc32434_wdt_probe(struct platform_device *pdev)
 	}
 
 	ret = misc_register(&rc32434_wdt_miscdev);
-
 	if (ret < 0) {
 		printk(KERN_ERR KBUILD_MODNAME
 			"failed to register watchdog device\n");
 		goto unmap;
 	}
 
-	init_completion(&rc32434_wdt_device.stop);
-	rc32434_wdt_device.queue = 0;
-
-	clear_bit(0, &rc32434_wdt_device.inuse);
-
-	setup_timer(&rc32434_wdt_device.timer, rc32434_wdt_update, 0L);
-
-	rc32434_wdt_device.default_ticks = ticks;
-
-	rc32434_wdt_start();
-
 	printk(banner, timeout);
 
 	return 0;
@@ -304,23 +280,17 @@ unmap:
 	return ret;
 }
 
-static int rc32434_wdt_remove(struct platform_device *pdev)
+static int __devexit rc32434_wdt_remove(struct platform_device *pdev)
 {
-	if (rc32434_wdt_device.queue) {
-		rc32434_wdt_device.queue = 0;
-		wait_for_completion(&rc32434_wdt_device.stop);
-	}
 	misc_deregister(&rc32434_wdt_miscdev);
-
 	iounmap(wdt_reg);
-
 	return 0;
 }
 
 static struct platform_driver rc32434_wdt = {
 	.probe	= rc32434_wdt_probe,
-	.remove = rc32434_wdt_remove,
-	.driver = {
+	.remove	= __devexit_p(rc32434_wdt_remove),
+	.driver	= {
 		.name = "rc32434_wdt",
 	}
 };