Add a watchdog driver for rdc321x (needs testing) and try to detect the rdc cpu

SVN-Revision: 8505

5 files changed, 323 insertions, 2 deletions

diff --git a/target/linux/rdc-2.6/files/arch/i386/kernel/cpu/rdc.c b/target/linux/rdc-2.6/files/arch/i386/kernel/cpu/rdc.c
new file mode 100644
index 0000000..f4b9083
--- /dev/null
+++ b/target/linux/rdc-2.6/files/arch/i386/kernel/cpu/rdc.c
@@ -0,0 +1,24 @@
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+
+#include "cpu.h"
+
+static struct cpu_dev rdc_cpu_dev __cpuinitdata = {
+        .c_vendor       = "RDC",
+        .c_models = {
+                { .vendor = X86_VENDOR_RDC, .family = 4, .model_names =
+                  {
+                          [0] = "R861x(-G)",
+                  }
+                },
+        },
+};
+
+int __init rdc_init_cpu(void)
+{
+        cpu_devs[X86_VENDOR_RDC] = &rdc_cpu_dev;
+        return 0;
+}
diff --git a/target/linux/rdc-2.6/files/arch/i386/mach-rdc/Makefile b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/Makefile
new file mode 100644
index 0000000..5961bc7
--- /dev/null
+++ b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the RDC321x specific parts of the kernel
+#
+obj-$(CONFIG_X86_RDC)        := gpio.o platform.o wdt.o
+
diff --git a/target/linux/rdc-2.6/files/arch/i386/mach-rdc/platform.c b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/platform.c
index 96a9c9d..6809dcd 100644
--- a/target/linux/rdc-2.6/files/arch/i386/mach-rdc/platform.c
+++ b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/platform.c
@@ -31,6 +31,8 @@
 
 #include <asm/gpio.h>
 
+#define PFX "rdc321x: "
+
 /* FIXME : Flash */
 static struct resource rdc_flash_resource[] = {
 	[0] = {
@@ -54,17 +56,26 @@ static struct platform_device rdc321x_leds = {
 	.num_resources = 0,
 };
 
+static struct platform_device rdc321x_wdt = {
+	.name = "rdc321x-wdt",
+	.id = -1,
+	.num_resources = 0,
+};
+
 static int __init rdc_board_setup(void)
 {
 	int err;
 
 	err = platform_device_register(&rdc_flash_device);
 	if (err)
-		printk(KERN_ALERT "rdc321x: failed to register flash\n");
+		printk(KERN_ALERT PFX "failed to register flash\n");
 
 	err = platform_device_register(&rdc321x_leds);
 	if (err)
-		printk(KERN_ALERT "rdc321x: failed to register LEDS\n");
+		printk(KERN_ALERT PFX "failed to register LEDS\n");
+
+	err = platform_device_register(&rdc321x_wdt);
+		printk(KERN_ALERT PFX "failed to register watchdog\n");
 
 	return err; 
 }
diff --git a/target/linux/rdc-2.6/files/arch/i386/mach-rdc/wdt.c b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/wdt.c
new file mode 100644
index 0000000..4e6f12b
--- /dev/null
+++ b/target/linux/rdc-2.6/files/arch/i386/mach-rdc/wdt.c
@@ -0,0 +1,275 @@
+/*
+ * RDC321x watchdog driver
+ *
+ * Copyright (C) 2007 Florian Fainelli <florian@openwrt.org>
+ *
+ * This driver is highly inspired from the rdc321x_wdt driver
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include <asm/mach-rdc/rdc321x_defs.h>
+
+#define RDC_WDT_MASK		0x80000000	/* Mask */
+#define RDC_WDT_EN		0x00800000 	/* Enable bit */
+#define RDC_WDT_WTI		0x00200000	/* Generate a CPU reset/NMI/WDT irq when WDT timeout is reached */
+#define RDC_WDT_RST		0x00100000	/* Reset bit */
+#define RDC_WDT_WIF		0x00040000	/* WDT IRQ Flag */
+#define RDC_WDT_IRT		0x00000100	/* IRQ Routing table */
+#define RDC_WDT_CNT		0x00000001	/* WDT count */
+
+#define RDC_CLS_TMR		0x80003844	/* Clear timer */
+
+#define RDC_WDT_INTERVAL	(HZ/10+1)
+
+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 int ticks = 1000;
+
+/* some device data */
+
+static struct {
+	struct completion stop;
+	volatile int running;
+	struct timer_list timer;
+	volatile int queue;
+	int default_ticks;
+	unsigned long inuse;
+} rdc321x_wdt_device;
+
+/* generic helper functions */
+
+static void rdc321x_wdt_trigger(unsigned long unused)
+{
+	if( rdc321x_wdt_device.running )
+		ticks--;
+
+	/* keep watchdog alive */
+	outl(RDC_WDT_EN|inl(RDC3210_CFGREG_DATA), RDC3210_CFGREG_DATA);	
+	
+	/* requeue?? */
+	if (rdc321x_wdt_device.queue && ticks)
+		mod_timer(&rdc321x_wdt_device.timer, jiffies + RDC_WDT_INTERVAL);
+	else {
+		/* ticks doesn't matter anyway */
+		complete(&rdc321x_wdt_device.stop);
+	}
+
+}
+
+static void rdc321x_wdt_reset(void)
+{
+	ticks = rdc321x_wdt_device.default_ticks;
+}
+
+static void rdc321x_wdt_start(void)
+{
+	if (!rdc321x_wdt_device.queue) {
+		rdc321x_wdt_device.queue = 1;
+
+		/* Clear the timer */
+		outl(RDC_CLS_TMR, RDC3210_CFGREG_ADDR);
+		
+		/* Enable watchdog and set the timeout to 81.92 us */
+		outl(RDC_WDT_EN|RDC_WDT_CNT, RDC3210_CFGREG_DATA);
+
+		mod_timer(&rdc321x_wdt_device.timer, jiffies + RDC_WDT_INTERVAL);
+	}
+
+	/* if process dies, counter is not decremented */
+	rdc321x_wdt_device.running++;
+}
+
+static int rdc321x_wdt_stop(void)
+{
+	if (rdc321x_wdt_device.running)
+		rdc321x_wdt_device.running = 0;
+
+	ticks = rdc321x_wdt_device.default_ticks;
+
+	return -EIO;
+}
+
+/* filesystem operations */
+
+static int rdc321x_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
+		return -EBUSY;
+
+	return nonseekable_open(inode, file);
+}
+
+static int rdc321x_wdt_release(struct inode *inode, struct file *file)
+{
+	clear_bit(0, &rdc321x_wdt_device.inuse);
+	return 0;
+}
+
+static int rdc321x_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	unsigned int value;
+	static struct watchdog_info ident =
+	{
+		.options = WDIOF_CARDRESET,
+		.identity = "RDC321x WDT",
+	};
+
+	switch(cmd) {
+		case WDIOC_KEEPALIVE:
+			rdc321x_wdt_reset();
+			break;
+		case WDIOC_GETSTATUS:
+			/* Read the value from the DATA register */
+			value = inl(RDC3210_CFGREG_DATA);
+			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:
+					rdc321x_wdt_start();
+					break;
+				case WDIOS_DISABLECARD:
+					return rdc321x_wdt_stop();
+				default:
+					return -EINVAL;
+			}
+			break;
+		default:
+    			return -ENOTTY;
+	}
+	return 0;
+}
+
+static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+	if ( !count )
+		return -EIO;
+
+	rdc321x_wdt_reset();
+
+	return count;
+}
+
+static const struct file_operations rdc321x_wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.ioctl		= rdc321x_wdt_ioctl,
+	.open		= rdc321x_wdt_open,
+	.write		= rdc321x_wdt_write,
+	.release	= rdc321x_wdt_release,
+};
+
+static struct miscdevice rdc321x_wdt_misc = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &rdc321x_wdt_fops,
+};
+
+static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)
+{
+	int err;
+
+	if ( (err = misc_register(&rdc321x_wdt_misc)) < 0 ) {
+		printk(KERN_ERR PFX "misc_register failed\n");
+		goto no_misc;
+	}
+
+	/* Reset the watchdog */
+	outl(RDC_WDT_RST, RDC3210_CFGREG_DATA);
+
+	init_completion(&rdc321x_wdt_device.stop);
+	rdc321x_wdt_device.queue = 0;
+
+	clear_bit(0, &rdc321x_wdt_device.inuse);
+
+	setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
+
+	rdc321x_wdt_device.default_ticks = ticks;
+
+	printk(KERN_INFO PFX "init success\n");
+
+	return 0;
+
+no_misc:
+	return err;
+}
+
+static int rdc321x_wdt_remove(struct platform_device *pdev)
+{
+	if (rdc321x_wdt_device.queue) {
+		rdc321x_wdt_device.queue = 0;
+		wait_for_completion(&rdc321x_wdt_device.stop);
+	}
+
+	misc_deregister(&rdc321x_wdt_misc);
+
+	return 0;
+}
+
+static struct platform_driver rdc321x_wdt_driver = {
+	.probe = rdc321x_wdt_probe,
+	.remove = rdc321x_wdt_remove,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "rdc321x_wdt",
+	},
+};
+
+static int __init rdc321x_wdt_init(void)
+{
+	return platform_driver_register(&rdc321x_wdt_driver);
+}
+
+static void __exit rdc321x_wdt_exit(void)
+{
+	platform_driver_unregister(&rdc321x_wdt_driver);
+}
+
+module_init(rdc321x_wdt_init);
+module_exit(rdc321x_wdt_exit);
+
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_DESCRIPTION("RDC321x watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
diff --git a/target/linux/rdc-2.6/files/include/asm-i386/mach-rdc/rdc321x_defs.h b/target/linux/rdc-2.6/files/include/asm-i386/mach-rdc/rdc321x_defs.h
index e69de29..838ba8f 100644
--- a/target/linux/rdc-2.6/files/include/asm-i386/mach-rdc/rdc321x_defs.h
+++ b/target/linux/rdc-2.6/files/include/asm-i386/mach-rdc/rdc321x_defs.h
@@ -0,0 +1,6 @@
+#define PFX	"rdc321x: "
+
+/* General purpose configuration and data registers */
+#define RDC3210_CFGREG_ADDR     0x0CF8
+#define RDC3210_CFGREG_DATA     0x0CFC
+#define RDC_MAX_GPIO		0x3A