--- /dev/null
+/*
+ * 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 <gokimi@msn.com>
+ * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
+ */
+
+#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 <linux/platform_device.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,
+};
+
+static int __init amazon_wdt_probe(struct platform_device *dev)
+{
+ 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\n");
+ return 0;
+}
+
+static int amazon_wdt_remove(struct platform_device *dev)
+{
+ 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\n");
+ return 0;
+}
+
+static struct platform_driver amazon_wdt_driver = {
+ .probe = amazon_wdt_probe,
+ .remove = amazon_wdt_remove,
+ .driver = {
+ .name = "amazon_wdt",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init amazon_wdt_init(void)
+{
+ int ret = platform_driver_register(&amazon_wdt_driver);
+ if (ret)
+ printk(KERN_WARNING "amazon_wdt: error registering platfom driver!\n");
+ return ret;
+}
+
+static void __exit amazon_wdt_exit(void)
+{
+ platform_driver_unregister(&amazon_wdt_driver);
+}
+
+module_init(amazon_wdt_init);
+module_exit(amazon_wdt_exit);
+
+MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Infineon / John Crispin <blogic@openwrt.org>");
+MODULE_DESCRIPTION("AMAZON WDT driver");
+
projects / openwrt-10.03 / .git / blobdiff