diff options
Diffstat (limited to 'drivers/char/watchdog/pnx4008_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/pnx4008_wdt.c | 358 |
1 files changed, 0 insertions, 358 deletions
diff --git a/drivers/char/watchdog/pnx4008_wdt.c b/drivers/char/watchdog/pnx4008_wdt.c deleted file mode 100644 index 22f8873dd09..00000000000 --- a/drivers/char/watchdog/pnx4008_wdt.c +++ /dev/null @@ -1,358 +0,0 @@ -/* - * drivers/char/watchdog/pnx4008_wdt.c - * - * Watchdog driver for PNX4008 board - * - * Authors: Dmitry Chigirev <source@mvista.com>, - * Vitaly Wool <vitalywool@gmail.com> - * Based on sa1100 driver, - * Copyright (C) 2000 Oleg Drokin <green@crimea.edu> - * - * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under - * the terms of the GNU General Public License version 2. This program - * is licensed "as is" without any warranty of any kind, whether express - * or implied. - */ - -#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/watchdog.h> -#include <linux/init.h> -#include <linux/bitops.h> -#include <linux/ioport.h> -#include <linux/device.h> -#include <linux/platform_device.h> -#include <linux/clk.h> -#include <linux/spinlock.h> - -#include <asm/hardware.h> -#include <asm/uaccess.h> -#include <asm/io.h> - -#define MODULE_NAME "PNX4008-WDT: " - -/* WatchDog Timer - Chapter 23 Page 207 */ - -#define DEFAULT_HEARTBEAT 19 -#define MAX_HEARTBEAT 60 - -/* Watchdog timer register set definition */ -#define WDTIM_INT(p) ((p) + 0x0) -#define WDTIM_CTRL(p) ((p) + 0x4) -#define WDTIM_COUNTER(p) ((p) + 0x8) -#define WDTIM_MCTRL(p) ((p) + 0xC) -#define WDTIM_MATCH0(p) ((p) + 0x10) -#define WDTIM_EMR(p) ((p) + 0x14) -#define WDTIM_PULSE(p) ((p) + 0x18) -#define WDTIM_RES(p) ((p) + 0x1C) - -/* WDTIM_INT bit definitions */ -#define MATCH_INT 1 - -/* WDTIM_CTRL bit definitions */ -#define COUNT_ENAB 1 -#define RESET_COUNT (1<<1) -#define DEBUG_EN (1<<2) - -/* WDTIM_MCTRL bit definitions */ -#define MR0_INT 1 -#undef RESET_COUNT0 -#define RESET_COUNT0 (1<<2) -#define STOP_COUNT0 (1<<2) -#define M_RES1 (1<<3) -#define M_RES2 (1<<4) -#define RESFRC1 (1<<5) -#define RESFRC2 (1<<6) - -/* WDTIM_EMR bit definitions */ -#define EXT_MATCH0 1 -#define MATCH_OUTPUT_HIGH (2<<4) /*a MATCH_CTRL setting */ - -/* WDTIM_RES bit definitions */ -#define WDOG_RESET 1 /* read only */ - -#define WDOG_COUNTER_RATE 13000000 /*the counter clock is 13 MHz fixed */ - -static int nowayout = WATCHDOG_NOWAYOUT; -static int heartbeat = DEFAULT_HEARTBEAT; - -static spinlock_t io_lock; -static unsigned long wdt_status; -#define WDT_IN_USE 0 -#define WDT_OK_TO_CLOSE 1 -#define WDT_REGION_INITED 2 -#define WDT_DEVICE_INITED 3 - -static unsigned long boot_status; - -static struct resource *wdt_mem; -static void __iomem *wdt_base; -struct clk *wdt_clk; - -static void wdt_enable(void) -{ - spin_lock(&io_lock); - - if (wdt_clk) - clk_set_rate(wdt_clk, 1); - - /* stop counter, initiate counter reset */ - __raw_writel(RESET_COUNT, WDTIM_CTRL(wdt_base)); - /*wait for reset to complete. 100% guarantee event */ - while (__raw_readl(WDTIM_COUNTER(wdt_base))) - cpu_relax(); - /* internal and external reset, stop after that */ - __raw_writel(M_RES2 | STOP_COUNT0 | RESET_COUNT0, - WDTIM_MCTRL(wdt_base)); - /* configure match output */ - __raw_writel(MATCH_OUTPUT_HIGH, WDTIM_EMR(wdt_base)); - /* clear interrupt, just in case */ - __raw_writel(MATCH_INT, WDTIM_INT(wdt_base)); - /* the longest pulse period 65541/(13*10^6) seconds ~ 5 ms. */ - __raw_writel(0xFFFF, WDTIM_PULSE(wdt_base)); - __raw_writel(heartbeat * WDOG_COUNTER_RATE, WDTIM_MATCH0(wdt_base)); - /*enable counter, stop when debugger active */ - __raw_writel(COUNT_ENAB | DEBUG_EN, WDTIM_CTRL(wdt_base)); - - spin_unlock(&io_lock); -} - -static void wdt_disable(void) -{ - spin_lock(&io_lock); - - __raw_writel(0, WDTIM_CTRL(wdt_base)); /*stop counter */ - if (wdt_clk) - clk_set_rate(wdt_clk, 0); - - spin_unlock(&io_lock); -} - -static int pnx4008_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_IN_USE, &wdt_status)) - return -EBUSY; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - wdt_enable(); - - return nonseekable_open(inode, file); -} - -static ssize_t -pnx4008_wdt_write(struct file *file, const char *data, size_t len, - loff_t * ppos) -{ - if (len) { - if (!nowayout) { - size_t i; - - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - set_bit(WDT_OK_TO_CLOSE, &wdt_status); - } - } - wdt_enable(); - } - - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | - WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, - .identity = "PNX4008 Watchdog", -}; - -static int -pnx4008_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - int ret = -ENOTTY; - int time; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user((struct watchdog_info *)arg, &ident, - sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - ret = put_user(0, (int *)arg); - break; - - case WDIOC_GETBOOTSTATUS: - ret = put_user(boot_status, (int *)arg); - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(time, (int *)arg); - if (ret) - break; - - if (time <= 0 || time > MAX_HEARTBEAT) { - ret = -EINVAL; - break; - } - - heartbeat = time; - wdt_enable(); - /* Fall through */ - - case WDIOC_GETTIMEOUT: - ret = put_user(heartbeat, (int *)arg); - break; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; - } - return ret; -} - -static int pnx4008_wdt_release(struct inode *inode, struct file *file) -{ - if (!test_bit(WDT_OK_TO_CLOSE, &wdt_status)) - printk(KERN_WARNING "WATCHDOG: Device closed unexpectdly\n"); - - wdt_disable(); - clear_bit(WDT_IN_USE, &wdt_status); - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - return 0; -} - -static const struct file_operations pnx4008_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = pnx4008_wdt_write, - .ioctl = pnx4008_wdt_ioctl, - .open = pnx4008_wdt_open, - .release = pnx4008_wdt_release, -}; - -static struct miscdevice pnx4008_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &pnx4008_wdt_fops, -}; - -static int pnx4008_wdt_probe(struct platform_device *pdev) -{ - int ret = 0, size; - struct resource *res; - - spin_lock_init(&io_lock); - - if (heartbeat < 1 || heartbeat > MAX_HEARTBEAT) - heartbeat = DEFAULT_HEARTBEAT; - - printk(KERN_INFO MODULE_NAME - "PNX4008 Watchdog Timer: heartbeat %d sec\n", heartbeat); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - printk(KERN_INFO MODULE_NAME - "failed to get memory region resouce\n"); - return -ENOENT; - } - - size = res->end - res->start + 1; - wdt_mem = request_mem_region(res->start, size, pdev->name); - - if (wdt_mem == NULL) { - printk(KERN_INFO MODULE_NAME "failed to get memory region\n"); - return -ENOENT; - } - wdt_base = (void __iomem *)IO_ADDRESS(res->start); - - wdt_clk = clk_get(&pdev->dev, "wdt_ck"); - if (IS_ERR(wdt_clk)) { - ret = PTR_ERR(wdt_clk); - release_resource(wdt_mem); - kfree(wdt_mem); - goto out; - } else - clk_set_rate(wdt_clk, 1); - - ret = misc_register(&pnx4008_wdt_miscdev); - if (ret < 0) { - printk(KERN_ERR MODULE_NAME "cannot register misc device\n"); - release_resource(wdt_mem); - kfree(wdt_mem); - clk_set_rate(wdt_clk, 0); - } else { - boot_status = (__raw_readl(WDTIM_RES(wdt_base)) & WDOG_RESET) ? - WDIOF_CARDRESET : 0; - wdt_disable(); /*disable for now */ - set_bit(WDT_DEVICE_INITED, &wdt_status); - } - -out: - return ret; -} - -static int pnx4008_wdt_remove(struct platform_device *pdev) -{ - misc_deregister(&pnx4008_wdt_miscdev); - if (wdt_clk) { - clk_set_rate(wdt_clk, 0); - clk_put(wdt_clk); - wdt_clk = NULL; - } - if (wdt_mem) { - release_resource(wdt_mem); - kfree(wdt_mem); - wdt_mem = NULL; - } - return 0; -} - -static struct platform_driver platform_wdt_driver = { - .driver = { - .name = "watchdog", - }, - .probe = pnx4008_wdt_probe, - .remove = pnx4008_wdt_remove, -}; - -static int __init pnx4008_wdt_init(void) -{ - return platform_driver_register(&platform_wdt_driver); -} - -static void __exit pnx4008_wdt_exit(void) -{ - return platform_driver_unregister(&platform_wdt_driver); -} - -module_init(pnx4008_wdt_init); -module_exit(pnx4008_wdt_exit); - -MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); -MODULE_DESCRIPTION("PNX4008 Watchdog Driver"); - -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, - "Watchdog heartbeat period in seconds from 1 to " - __MODULE_STRING(MAX_HEARTBEAT) ", default " - __MODULE_STRING(DEFAULT_HEARTBEAT)); - -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, - "Set to 1 to keep watchdog running after device release"); - -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |