diff options
Diffstat (limited to 'target/linux/amazon/files/drivers/char/watchdog/amazon_wdt.c')
-rw-r--r-- | target/linux/amazon/files/drivers/char/watchdog/amazon_wdt.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/target/linux/amazon/files/drivers/char/watchdog/amazon_wdt.c b/target/linux/amazon/files/drivers/char/watchdog/amazon_wdt.c deleted file mode 100644 index 6e1eb799a..000000000 --- a/target/linux/amazon/files/drivers/char/watchdog/amazon_wdt.c +++ /dev/null @@ -1,269 +0,0 @@ -/* - * 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"); - |