added improved watchdog driver for amazon

SVN-Revision: 8346

target/linux/amazon-2.6/files/drivers/char/amazon_wdt.c

@@ -1,261 +0,0 @@
-/*
- * Infineon AP DC COM  Amazon WDT driver
- * Copyright 2004 Wu Qi Ming <[email protected]>
- * All rights reserved
- */
-#if defined(MODVERSIONS)
-#include <linux/modversions.h>
-#endif
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/timer.h>
-#include <linux/fs.h>
-#include <linux/errno.h>
-#include <linux/proc_fs.h>
-#include <linux/stat.h>
-#include <linux/tty.h>
-#include <linux/selection.h>
-#include <linux/kmod.h>
-#include <linux/vmalloc.h>
-#include <linux/kdev_t.h>
-#include <linux/ioctl.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/amazon/amazon.h>
-#include <asm/amazon/amazon_wdt.h>
-
-#define AMAZON_WDT_EMSG(fmt, args...) printk( "%s: " fmt, __FUNCTION__ , ##args)
-
-extern unsigned int amazon_get_fpi_hz(void);
-
-/* forward declarations for _fops */
-static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset);
-static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset);
-static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
-static int wdt_open(struct inode *inode, struct file *file);
-static int wdt_release(struct inode *inode, struct file *file);
-static int wdt_proc_read(char *buf, char **start, off_t offset,int count, int *eof, void *data);
-
-
-static struct file_operations wdt_fops = {
-	read:wdt_read,
-	write:wdt_write,
-	ioctl:wdt_ioctl,
-	open:wdt_open,
-	release:wdt_release,	
-};
-
-/* data */
-static struct wdt_dev *amazon_wdt_dev;
-static struct proc_dir_entry* amazon_wdt_dir;
-static int occupied=0;
-
-
-/* Brief: enable WDT
- * Parameter:
- 	timeout: time interval for WDT
- * Return:
- 	0	OK
-		EINVAL
- * Describes:
- 	1. Password Access
-	2. Modify Access (change ENDINIT => 0)
-	3. Change WDT_CON1 (enable WDT)
-	4. Password Access again
-	5. Modify Access (change ENDINIT => 1)
- */
-int wdt_enable(int timeout)
-{
-  	u32 hard_psw,ffpi;
-  	int reload_value, divider=0;
-  
-	ffpi = amazon_get_fpi_hz();
-	
-  	divider = 1;
-  	if((reload_value=65536-timeout*ffpi/256)<0){
-        	divider = 0;
-        	reload_value=65536-timeout*ffpi/16384;
-  	}
-	if (reload_value < 0){
-		AMAZON_WDT_EMSG("timeout too large %d\n", timeout);
-		return -EINVAL;
-	}
-	
-	AMAZON_WDT_EMSG("timeout:%d reload_value: %8x\n", timeout, reload_value);
-  	
-	hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0;  
-  	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw;
-  	wmb();
-	
-  	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(hard_psw&0xff00)+(reload_value<<16)+0xf2;
-  	wmb();
-
-  	AMAZON_WDT_REG32(AMAZON_WDT_CON1)=divider<<2;  
-	wmb();
-	
-  	hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0;
-  	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw;
-  	
-	wmb();
-  	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+0xf3;
-	wmb();
-	return 0;
-}
-
-/*	Brief:	Disable/stop WDT
- */
-void wdt_disable(void)
-{
-     	u32 hard_psw=0;
-	
-     	hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0;  
-     	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw;
-     	wmb();
-
-     	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+0xf2;
-	wmb();
-	
-     	AMAZON_WDT_REG32(AMAZON_WDT_CON1)|=8;  
-	wmb();
-	
-     	hard_psw=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff01)+(AMAZON_WDT_REG32(AMAZON_WDT_CON1)&0xc)+ 0xf0;  
-     	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=hard_psw;
-     	wmb();
-
-     	AMAZON_WDT_REG32(AMAZON_WDT_CON0)=(AMAZON_WDT_REG32(AMAZON_WDT_CON0)&0xffffff00)+0xf3;
-	wmb();
-	
-   	return;
-}
-
-static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
-        int result=0;
-	static int timeout=-1;
-        
-        switch(cmd){
-         case AMAZON_WDT_IOC_START:
-          	AMAZON_WDT_DMSG("enable watch dog timer!\n");
-		if ( copy_from_user((void*)&timeout, (void*)arg, sizeof (int)) ){
-			AMAZON_WDT_EMSG("invalid argument\n");
-			result=-EINVAL;
-		}else{
-			if ((result = wdt_enable(timeout)) < 0){
-				timeout = -1;
-			}
-		}
-          	break;
-        case AMAZON_WDT_IOC_STOP:
-          	AMAZON_WDT_DMSG("disable watch dog timer\n");
-		timeout = -1;
-          	wdt_disable();
-		
-         	break;
-	case AMAZON_WDT_IOC_PING:
-		if (timeout <0 ){
-			result = -EIO;
-		}else{
-			result = wdt_enable(timeout); 
-		}		
-	}
-  	return result;
-}
-
-static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset)
-{
-	return 0;
-}
-
-static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset)
-{	
-	return count;
-}
-
-static int wdt_open(struct inode *inode, struct file *file)
-{
-        AMAZON_WDT_DMSG("wdt_open\n");
-	
-	if (occupied == 1) return -EBUSY;
-	occupied = 1;
-	
-	return 0;
-}
-
-static int wdt_release(struct inode *inode, struct file *file)
-{
-        AMAZON_WDT_DMSG("wdt_release\n"); 
-	
-	occupied = 0;
-	return 0;
-}
-
-
-int wdt_register_proc_read(char *buf, char **start, off_t offset,
-                         int count, int *eof, void *data)
-{
-   	int len=0;
-   	printk("wdt_registers:\n");
-   	len+=sprintf(buf+len,"NMISR:    0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_NMISR));
-   	len+=sprintf(buf+len,"RST_REQ:  0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_REQ));
-   	len+=sprintf(buf+len,"RST_SR:   0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_SR));
-   	len+=sprintf(buf+len,"WDT_CON0: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON0));
-   	len+=sprintf(buf+len,"WDT_CON1: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON1));
-   	len+=sprintf(buf+len,"WDT_SR:   0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_SR));
-   	*eof = 1;
-   	return len;
-}
-
-
-int __init amazon_wdt_init_module(void)
-{
-	int result=0;
-
-   	amazon_wdt_dev = (wdt_dev*)kmalloc(sizeof(wdt_dev),GFP_KERNEL);
-   	if (amazon_wdt_dev == NULL){
-   		return -ENOMEM;
-   	}
-	memset(amazon_wdt_dev,0,sizeof(wdt_dev));
-	
-      	amazon_wdt_dev->major=result;
-	strcpy(amazon_wdt_dev->name,"wdt");
-	
-	result = register_chrdev(0,amazon_wdt_dev->name,&wdt_fops);
-   	if (result < 0) {
-        	AMAZON_WDT_EMSG("cannot register device\n");
-		kfree(amazon_wdt_dev);
-       	 	return result;
-   	}
-
-   	amazon_wdt_dir=proc_mkdir("amazon_wdt",NULL);
-   	create_proc_read_entry("wdt_register",
-                          	0,
-                          	amazon_wdt_dir,
-                          	wdt_register_proc_read,
-                          	NULL);  
-   
-	occupied=0;
-   	return 0;
-}
-
-void amazon_wdt_cleanup_module(void)
-{
-	unregister_chrdev(amazon_wdt_dev->major,amazon_wdt_dev->name);
-        kfree(amazon_wdt_dev);	
-    	remove_proc_entry("wdt_register",amazon_wdt_dir);
-	remove_proc_entry("amazon_wdt",NULL);
-        AMAZON_WDT_DMSG("unloaded\n");
-	return;
-}
-
-MODULE_LICENSE ("GPL");
-MODULE_AUTHOR("Infineon IFAP DC COM");
-MODULE_DESCRIPTION("AMAZON WDT driver");
-
-module_init(amazon_wdt_init_module);
-module_exit(amazon_wdt_cleanup_module);
-

target/linux/amazon-2.6/files/drivers/char/watchdog/amazon_wdt.c

@@ -0,0 +1,246 @@
+/*
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ * Copyright 2004 Wu Qi Ming <[email protected]>
+ * Copyright (C) 2007 John Crispin <[email protected]>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/tty.h>
+#include <linux/selection.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/kdev_t.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/amazon/amazon.h>
+#include <asm/amazon/amazon_wdt.h>
+
+#define DRV_NAME "AMAZON WDT:"
+
+#undef AMAZON_WDT_DEBUG 
+
+extern unsigned int amazon_get_fpi_hz(void);
+static int amazon_wdt_isopen = 0;
+
+#ifdef AMAZON_WDT_DEBUG
+static struct proc_dir_entry* amazon_wdt_dir;
+#endif
+
+int wdt_enable(int timeout)
+{
+  	u32 hard_psw, ffpi;
+  	int reload_value, divider = 1;
+  
+	ffpi = amazon_get_fpi_hz();
+
+	reload_value = 65536 - timeout * ffpi / 256;
+  	
+	if (reload_value < 0) {
+		divider = 0;
+		reload_value = 65536 - timeout * ffpi / 16384;
+  	}
+
+	if (reload_value < 0){
+		printk(KERN_INFO DRV_NAME "timeout too large %d\n", timeout);
+		return -EINVAL;
+	}
+	
+	printk(KERN_INFO DRV_NAME "timeout:%d reload_value: %8x\n", timeout, reload_value);
+  	
+	hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
+				(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;  
+  	amazon_writel(hard_psw, AMAZON_WDT_CON0);
+  	wmb();
+	
+	amazon_writel((hard_psw & 0xff00) + (reload_value << 16) + 0xf2, AMAZON_WDT_CON0);
+  	wmb();
+
+  	amazon_writel(divider << 2, AMAZON_WDT_CON1);  
+	wmb();
+	
+  	hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
+				(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;
+  	amazon_writel(hard_psw, AMAZON_WDT_CON0);
+	wmb();
+  	
+	amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
+	wmb();
+	return 0;
+}
+
+void wdt_disable(void)
+{
+	u32 hard_psw = 0;
+
+	hard_psw = (amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) + 
+			(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;  
+	amazon_writel(hard_psw, AMAZON_WDT_CON0);
+	wmb();
+
+	amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf2);
+	wmb();
+
+	amazon_writel_masked(AMAZON_WDT_CON1, 0x8, 0x8);  
+	wmb();
+
+	hard_psw=(amazon_readl(AMAZON_WDT_CON0) & 0xffffff01) +
+			(amazon_readl(AMAZON_WDT_CON1) & 0xc) + 0xf0;  
+	amazon_writel(hard_psw, AMAZON_WDT_CON0);
+	wmb();
+
+	amazon_writel_masked(AMAZON_WDT_CON0, 0xff, 0xf3);
+	wmb();
+
+   	return;
+}
+
+static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int result=0;
+	static int timeout=-1;
+
+	switch(cmd){
+		case AMAZON_WDT_IOC_START:
+			printk(KERN_INFO DRV_NAME "enable watch dog timer!\n");
+			if (copy_from_user((void*)&timeout, (void*)arg, sizeof (int))) {
+				printk(KERN_INFO DRV_NAME "invalid argument\n");
+				result=-EINVAL;
+			} else if ((result = wdt_enable(timeout)) < 0) {
+				timeout = -1;
+			}
+			break;
+		
+		case AMAZON_WDT_IOC_STOP:
+			printk(KERN_INFO DRV_NAME "disable watch dog timer\n");
+			timeout = -1;
+			wdt_disable();
+			break;
+		
+		case AMAZON_WDT_IOC_PING:
+			if (timeout < 0) {
+				result = -EIO;
+			} else {
+				result = wdt_enable(timeout); 
+			}		
+			break;
+		
+		default:
+			result=-EINVAL;
+			break;
+	}
+	return result;
+}
+
+static ssize_t wdt_read(struct file *file, char *buf, size_t count, loff_t *offset)
+{
+	return 0;
+}
+
+static ssize_t wdt_write(struct file *file, const char *buf, size_t count, loff_t *offset)
+{	
+	return count;
+}
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+	if (amazon_wdt_isopen == 1)
+		return -EBUSY;
+
+	amazon_wdt_isopen = 1;
+	printk(KERN_INFO DRV_NAME "opened\n");	
+	return 0;
+}
+
+static int wdt_release(struct inode *inode, struct file *file)
+{
+	amazon_wdt_isopen = 0;
+	printk(KERN_INFO DRV_NAME "closed\n");	
+	return 0;
+}
+
+#ifdef AMAZON_WDT_DEBUG
+int wdt_register_proc_read(char *buf, char **start, off_t offset,
+                         int count, int *eof, void *data)
+{
+   	int len=0;
+   	len+=sprintf(buf+len,"NMISR:    0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_NMISR));
+   	len+=sprintf(buf+len,"RST_REQ:  0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_REQ));
+   	len+=sprintf(buf+len,"RST_SR:   0x%08x\n",AMAZON_WDT_REG32(AMAZON_RST_SR));
+   	len+=sprintf(buf+len,"WDT_CON0: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON0));
+   	len+=sprintf(buf+len,"WDT_CON1: 0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_CON1));
+   	len+=sprintf(buf+len,"WDT_SR:   0x%08x\n",AMAZON_WDT_REG32(AMAZON_WDT_SR));
+   	*eof = 1;
+   	return len;
+}
+#endif
+
+static struct file_operations wdt_fops = {
+	read:		wdt_read,
+	write:		wdt_write,
+	ioctl:		wdt_ioctl,
+	open:		wdt_open,
+	release:	wdt_release,	
+};
+
+int __init amazon_wdt_init_module(void)
+{
+	int result = result = register_chrdev(0, "watchdog", &wdt_fops);
+   	
+	if (result < 0) {
+        printk(KERN_INFO DRV_NAME "cannot register device\n");
+       	return result;
+   	}
+
+#ifdef AMAZON_WDT_DEBUG
+	amazon_wdt_dir=proc_mkdir("amazon_wdt",NULL);
+   	create_proc_read_entry("wdt_register", 0, amazon_wdt_dir,
+                          	wdt_register_proc_read, NULL);  
+#endif
+
+	amazon_wdt_isopen=0;
+	printk(KERN_INFO DRV_NAME "driver loaded but inactive");
+	return 0;
+}
+
+void amazon_wdt_cleanup_module(void)
+{
+	unregister_chrdev(0, "watchdog");
+#ifdef AMAZON_WDT_DEBUG
+	remove_proc_entry("wdt_register", amazon_wdt_dir);
+	remove_proc_entry("amazon_wdt", NULL);
+#endif
+	printk(KERN_INFO DRV_NAME "unregistered");
+	return;
+}
+
+MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Infineon / John Crispin <[email protected]>");
+MODULE_DESCRIPTION("AMAZON WDT driver");
+
+module_init(amazon_wdt_init_module);
+module_exit(amazon_wdt_cleanup_module);
+

target/linux/amazon-2.6/patches/017-wdt-driver.patch

@@ -0,0 +1,10 @@
+--- linux-2.6.21.5/drivers/char/watchdog/Makefile.orig	2007-08-05 11:13:29.177013987 +0200
++++ linux-2.6.21.5/drivers/char/watchdog/Makefile	2007-08-05 11:13:52.190325445 +0200
+@@ -74,6 +74,7 @@
+ # MIPS Architecture
+ obj-$(CONFIG_INDYDOG) += indydog.o
+ obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o
++obj-$(CONFIG_AMAZON_WDT) += amazon_wdt.o
+ 
+ # S390 Architecture
+