path: root/recipes/linux/linux-2.6.24/ts72xx/ts72xx-watchdog.patch

TS-72xx watchdog driver

Signed-off-by: Matthieu Crapet <mcrapet@gmail.com>

Index: linux-2.6.24/arch/arm/mach-ep93xx/ts72xx.c
===================================================================
--- linux-2.6.24.orig/arch/arm/mach-ep93xx/ts72xx.c	2008-02-03 14:09:54.000000000 +0100
+++ linux-2.6.24/arch/arm/mach-ep93xx/ts72xx.c	2008-02-03 14:16:09.000000000 +0100
@@ -183,6 +183,26 @@
 	.resource	= ts72xx_eth_resource,
 };
 
+static struct resource ts72xx_watchdog_resources[] = {
+	[0] = {
+		.start  = TS72XX_WATCHDOG_CONTROL_PHYS_BASE,
+		.end  = TS72XX_WATCHDOG_CONTROL_PHYS_BASE + 0x0fff,
+		.flags  = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start  = TS72XX_WATCHDOG_FEED_PHYS_BASE,
+		.end  = TS72XX_WATCHDOG_FEED_PHYS_BASE + 0x0fff,
+		.flags  = IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device ts72xx_watchdog_device = {
+	.name   = "ts72xx_wdt",
+	.id   = -1,
+	.num_resources  = ARRAY_SIZE(ts72xx_watchdog_resources),
+	.resource = ts72xx_watchdog_resources,
+};
+
 static void __init ts72xx_init_machine(void)
 {
 	ep93xx_init_devices();
@@ -193,6 +213,7 @@
 	memcpy(ts72xx_eth_data.dev_addr,
 		(void *)(EP93XX_ETHERNET_BASE + 0x50), 6);
 	platform_device_register(&ts72xx_eth_device);
+	platform_device_register(&ts72xx_watchdog_device);
 }
 
 MACHINE_START(TS72XX, "Technologic Systems TS-72xx SBC")
Index: linux-2.6.24/drivers/watchdog/Kconfig
===================================================================
--- linux-2.6.24.orig/drivers/watchdog/Kconfig	2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24/drivers/watchdog/Kconfig	2008-02-03 14:16:09.000000000 +0100
@@ -247,6 +247,18 @@
 
 # H8300 Architecture
 
+config TS72XX_WATCHDOG
+	tristate "TS-72xx Watchdog"
+	depends on WATCHDOG && ARCH_EP93XX && MACH_TS72XX
+	help
+	  Say Y here if to include support for the CPLD watchdog
+	  included on Technologic Systems SBC.
+
+	  NOTE: timeout value is given in milliseconds, not in seconds.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ts72xx_wdt.
+
 # X86 (i386 + ia64 + x86_64) Architecture
 
 config ACQUIRE_WDT
Index: linux-2.6.24/drivers/watchdog/Makefile
===================================================================
--- linux-2.6.24.orig/drivers/watchdog/Makefile	2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24/drivers/watchdog/Makefile	2008-02-03 14:16:09.000000000 +0100
@@ -36,6 +36,7 @@
 obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
 obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o
 obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o
+obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
 obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o
 obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o
 obj-$(CONFIG_DAVINCI_WATCHDOG) += davinci_wdt.o
Index: linux-2.6.24/drivers/watchdog/ts72xx_wdt.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.24/drivers/watchdog/ts72xx_wdt.c	2008-02-03 14:16:09.000000000 +0100
@@ -0,0 +1,332 @@
+/*
+ *	TS-72xx Watchdog Driver for Technologic Systems boards.
+ *
+ *  Based on ep93xx_wdt.c by Lehtiniemi <rayl@mail.com> &
+ *      Alessandro Zummo <a.zummo@towertech.it>
+ *  and ib700wdt.c by Charles Howes <chowes@vsol.net>
+ *  and mpc83xx_wdt.c by Dave Updegraff <dave@cray.org> &
+ *      Kumar Gala <galak@kernel.crashing.org>
+ *
+ *	(c) Copyright 2006  Matthieu Crapet <mcrapet@gmail.com>
+ *
+ *	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.
+ *
+ * This driver only deals with native timeout provided by CPLD :
+ * 1/4s, 1/2s, 1s, 2s, 4s and 8s. No external timer is used.
+ * Notice that we must ping before modifying the control register.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/watchdog.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/mach-types.h>
+
+#define WATCHDOG_VERSION "0.2"
+#define PFX "ts72xx_wdt: "
+
+#define WATCHDOG_TIMEOUT 8000 /* 8 seconds */
+#define WDT_IN_USE      0
+#define WDT_OK_TO_CLOSE 1
+
+static unsigned long ts72xx_wdt_status;
+static unsigned char ts72xx_wdt_cpld_value = 0x7;
+static int nowayout = WATCHDOG_NOWAYOUT;
+static int timeout = WATCHDOG_TIMEOUT;
+
+static int ts72xx_wdt_times[12] = {
+	6000, 3000, 1500, 750, 275, 0,
+	8000, 4000, 2000, 1000, 500, 250
+};
+
+static void __iomem *control_register;
+static void __iomem *feed_register;
+
+
+/*
+ *	Kernel methods.
+ */
+
+static inline void ts72xx_wdt_ping(void)
+{
+	__raw_writew(0x05, feed_register);
+}
+
+static inline void ts72xx_wdt_enable(void)
+{
+	__raw_writew(0x05, feed_register);
+	__raw_writew(ts72xx_wdt_cpld_value, control_register);
+}
+
+static inline void ts72xx_wdt_disable(void)
+{
+	__raw_writew(0x05, feed_register);
+	__raw_writew(0, control_register);
+}
+
+static inline void ts72xx_parse_timeout(int value)
+{
+	unsigned char cpld_value = 0x7;
+	int i;
+
+	if ((value > 8000) || (value < 250)) {
+		timeout = WATCHDOG_TIMEOUT;
+		printk(KERN_INFO PFX "Timeout value out of range, set to %d\n", timeout);
+	} else {
+		for (i = 0; i < 6; i++) {
+			if (value >= ts72xx_wdt_times[i]) {
+				timeout = ts72xx_wdt_times[i+6];
+
+				if (value != timeout)
+					printk(KERN_INFO PFX "Timeout value rounded to %d\n", timeout);
+
+				if (i >= 3) /* cpld_value can't be 4 */
+					i++;
+
+				cpld_value = 7 - i;
+				break;
+			}
+		}
+	}
+
+	ts72xx_wdt_cpld_value = cpld_value;
+}
+
+static ssize_t ts72xx_wdt_write(struct file *file, const char __user *buf,
+				 size_t count, loff_t *ppos)
+{
+	/* Can't seek (pwrite) on this device */
+	if (*ppos != file->f_pos)
+		return -ESPIPE;
+
+	if (count) {
+		if (!nowayout) {
+			size_t i;
+
+			clear_bit(WDT_OK_TO_CLOSE, &ts72xx_wdt_status);
+
+			for (i = 0; i != count; i++) {
+				char c;
+
+				if (get_user(c, buf + i))
+					return -EFAULT;
+
+				if (c == 'V')
+					set_bit(WDT_OK_TO_CLOSE, &ts72xx_wdt_status);
+				else
+					clear_bit(WDT_OK_TO_CLOSE, &ts72xx_wdt_status);
+			}
+		}
+		ts72xx_wdt_ping();
+	}
+
+	return count;
+}
+
+static int ts72xx_wdt_ioctl(struct inode *inode, struct file *file,
+			     unsigned int cmd, unsigned long arg)
+{
+	int new_margin;
+	int ret = -ENOIOCTLCMD;
+
+	static struct watchdog_info ident = {
+		.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "TS-72xx Watchdog",
+	};
+
+	switch (cmd) {
+		case WDIOC_GETSUPPORT:
+			ret = copy_to_user((struct watchdog_info __user *)arg, &ident,
+			sizeof(ident)) ? -EFAULT : 0;
+			break;
+
+		case WDIOC_GETSTATUS:
+		case WDIOC_GETBOOTSTATUS:
+			ret = put_user(0, (int __user *)arg);
+			break;
+
+		case WDIOC_KEEPALIVE:
+			ts72xx_wdt_ping();
+			ret = 0;
+			break;
+
+		case WDIOC_SETTIMEOUT:
+			if (get_user(new_margin, (int __user *)arg))
+				return -EFAULT;
+
+			ts72xx_parse_timeout(new_margin);
+			ts72xx_wdt_enable();
+			/* Fall */
+
+		case WDIOC_GETTIMEOUT:
+			ret = put_user(timeout, (int __user *)arg);
+			break;
+	}
+
+	return ret;
+}
+
+static int ts72xx_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(WDT_IN_USE, &ts72xx_wdt_status))
+		return -EBUSY;
+
+	if (nowayout) {
+		__module_get(THIS_MODULE);
+	}
+
+	ts72xx_wdt_enable();
+	ts72xx_wdt_ping();
+
+	return nonseekable_open(inode, file);
+}
+
+static int ts72xx_wdt_close(struct inode *inode, struct file *file)
+{
+	if (test_bit(WDT_OK_TO_CLOSE, &ts72xx_wdt_status))
+		ts72xx_wdt_disable();
+	else
+		printk(KERN_CRIT PFX "Device file closed unexpectedly. "
+		       "Will not stop the WDT!\n");
+
+	clear_bit(WDT_IN_USE, &ts72xx_wdt_status);
+
+	return 0;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static struct file_operations ts72xx_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= ts72xx_wdt_write,
+	.ioctl		= ts72xx_wdt_ioctl,
+	.open		= ts72xx_wdt_open,
+	.release	= ts72xx_wdt_close,
+};
+
+static struct miscdevice ts72xx_wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &ts72xx_wdt_fops,
+};
+
+static void ts72xx_wdt_shutdown(struct platform_device *dev)
+{
+	ts72xx_wdt_disable();
+}
+
+static int __devinit ts72xx_wdt_probe(struct platform_device *dev)
+{
+	struct resource *r;
+	int ret;
+
+	if (!machine_is_ts72xx())
+		return -ENODEV;
+
+	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
+
+	if (!r) {
+		ret = -ENODEV;
+		goto err_out;
+	}
+
+	control_register = ioremap(r->start, r->end - r->start + 1);
+
+	if (control_register == NULL) {
+		ret = -ENOMEM;
+		goto err_out;
+	}
+
+	r = platform_get_resource(dev, IORESOURCE_MEM, 1);
+
+	if (!r) {
+		ret = -ENODEV;
+		goto err_unmap1;
+	}
+
+	feed_register = ioremap(r->start, r->end - r->start + 1);
+
+	if (feed_register == NULL) {
+		ret = -ENOMEM;
+		goto err_unmap1;
+	}
+
+	ret = misc_register(&ts72xx_wdt_miscdev);
+	if (ret) {
+		printk(KERN_ERR PFX "cannot register miscdev on minor=%d "
+		       "(err=%d), ep93xx_watchdog already loaded?!\n", WATCHDOG_MINOR, ret);
+		goto err_unmap2;
+	}
+
+	printk(KERN_INFO PFX "TS-72xx watchdog driver, v%s\n", WATCHDOG_VERSION);
+	ts72xx_parse_timeout(timeout);
+
+	return 0;
+
+err_unmap2:
+	iounmap(feed_register);
+err_unmap1:
+	iounmap(control_register);
+err_out:
+	return ret;
+}
+
+static int __devexit ts72xx_wdt_remove(struct platform_device *dev)
+{
+	misc_deregister(&ts72xx_wdt_miscdev);
+	iounmap(feed_register);
+	iounmap(control_register);
+
+	return 0;
+}
+
+static struct platform_driver ts72xx_wdt_driver = {
+	.probe		= ts72xx_wdt_probe,
+	.remove		= __devexit_p(ts72xx_wdt_remove),
+	.shutdown	= ts72xx_wdt_shutdown,
+	.driver	= {
+		.owner	= THIS_MODULE,
+		.name	= "ts72xx_wdt",
+	},
+};
+
+static int __init ts72xx_wdt_init(void)
+{
+	return platform_driver_register(&ts72xx_wdt_driver);
+}
+
+static void __exit ts72xx_wdt_exit(void)
+{
+	platform_driver_unregister(&ts72xx_wdt_driver);
+}
+
+module_init(ts72xx_wdt_init);
+module_exit(ts72xx_wdt_exit);
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+#endif
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,"Watchdog timeout in milliseconds (250..8000, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
+
+MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>");
+MODULE_DESCRIPTION("TS-72xx watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Index: linux-2.6.24/include/asm-arm/arch-ep93xx/ts72xx.h
===================================================================
--- linux-2.6.24.orig/include/asm-arm/arch-ep93xx/ts72xx.h	2008-02-03 14:09:54.000000000 +0100
+++ linux-2.6.24/include/asm-arm/arch-ep93xx/ts72xx.h	2008-02-03 14:16:09.000000000 +0100
@@ -69,6 +69,9 @@
 #define TS72XX_RTC_DATA_SIZE		0x00001000
 
 
+#define TS72XX_WATCHDOG_CONTROL_PHYS_BASE	0x23800000
+#define TS72XX_WATCHDOG_FEED_PHYS_BASE		0x23c00000
+
 #ifndef __ASSEMBLY__
 #include <asm/io.h>