diff options
Diffstat (limited to 'drivers/char/watchdog/davinci_wdt.c')
| -rw-r--r-- | drivers/char/watchdog/davinci_wdt.c | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/drivers/char/watchdog/davinci_wdt.c b/drivers/char/watchdog/davinci_wdt.c deleted file mode 100644 index 19db5302ba6..00000000000 --- a/drivers/char/watchdog/davinci_wdt.c +++ /dev/null @@ -1,281 +0,0 @@ -/* - * drivers/char/watchdog/davinci_wdt.c - * - * Watchdog driver for DaVinci DM644x/DM646x processors - * - * Copyright (C) 2006 Texas Instruments. - * - * 2007 (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/platform_device.h> -#include <linux/spinlock.h> - -#include <asm/hardware.h> -#include <asm/uaccess.h> -#include <asm/io.h> - -#define MODULE_NAME "DAVINCI-WDT: " - -#define DEFAULT_HEARTBEAT 60 -#define MAX_HEARTBEAT 600 /* really the max margin is 264/27MHz*/ - -/* Timer register set definition */ -#define PID12 (0x0) -#define EMUMGT (0x4) -#define TIM12 (0x10) -#define TIM34 (0x14) -#define PRD12 (0x18) -#define PRD34 (0x1C) -#define TCR (0x20) -#define TGCR (0x24) -#define WDTCR (0x28) - -/* TCR bit definitions */ -#define ENAMODE12_DISABLED (0 << 6) -#define ENAMODE12_ONESHOT (1 << 6) -#define ENAMODE12_PERIODIC (2 << 6) - -/* TGCR bit definitions */ -#define TIM12RS_UNRESET (1 << 0) -#define TIM34RS_UNRESET (1 << 1) -#define TIMMODE_64BIT_WDOG (2 << 2) - -/* WDTCR bit definitions */ -#define WDEN (1 << 14) -#define WDFLAG (1 << 15) -#define WDKEY_SEQ0 (0xa5c6 << 16) -#define WDKEY_SEQ1 (0xda7e << 16) - -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 struct resource *wdt_mem; -static void __iomem *wdt_base; - -static void wdt_service(void) -{ - spin_lock(&io_lock); - - /* put watchdog in service state */ - davinci_writel(WDKEY_SEQ0, wdt_base + WDTCR); - /* put watchdog in active state */ - davinci_writel(WDKEY_SEQ1, wdt_base + WDTCR); - - spin_unlock(&io_lock); -} - -static void wdt_enable(void) -{ - u32 tgcr; - u32 timer_margin; - - spin_lock(&io_lock); - - /* disable, internal clock source */ - davinci_writel(0, wdt_base + TCR); - /* reset timer, set mode to 64-bit watchdog, and unreset */ - davinci_writel(0, wdt_base + TGCR); - tgcr = TIMMODE_64BIT_WDOG | TIM12RS_UNRESET | TIM34RS_UNRESET; - davinci_writel(tgcr, wdt_base + TGCR); - /* clear counter regs */ - davinci_writel(0, wdt_base + TIM12); - davinci_writel(0, wdt_base + TIM34); - /* set timeout period */ - timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) & 0xffffffff); - davinci_writel(timer_margin, wdt_base + PRD12); - timer_margin = (((u64)heartbeat * CLOCK_TICK_RATE) >> 32); - davinci_writel(timer_margin, wdt_base + PRD34); - /* enable run continuously */ - davinci_writel(ENAMODE12_PERIODIC, wdt_base + TCR); - /* Once the WDT is in pre-active state write to - * TIM12, TIM34, PRD12, PRD34, TCR, TGCR, WDTCR are - * write protected (except for the WDKEY field) - */ - /* put watchdog in pre-active state */ - davinci_writel(WDKEY_SEQ0 | WDEN, wdt_base + WDTCR); - /* put watchdog in active state */ - davinci_writel(WDKEY_SEQ1 | WDEN, wdt_base + WDTCR); - - spin_unlock(&io_lock); -} - -static int davinci_wdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(WDT_IN_USE, &wdt_status)) - return -EBUSY; - - wdt_enable(); - - return nonseekable_open(inode, file); -} - -static ssize_t -davinci_wdt_write(struct file *file, const char *data, size_t len, - loff_t *ppos) -{ - if (len) - wdt_service(); - - return len; -} - -static struct watchdog_info ident = { - .options = WDIOF_KEEPALIVEPING, - .identity = "DaVinci Watchdog", -}; - -static int -davinci_wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - int ret = -ENOTTY; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = copy_to_user((struct watchdog_info *)arg, &ident, - sizeof(ident)) ? -EFAULT : 0; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - ret = put_user(0, (int *)arg); - break; - - case WDIOC_GETTIMEOUT: - ret = put_user(heartbeat, (int *)arg); - break; - - case WDIOC_KEEPALIVE: - wdt_service(); - ret = 0; - break; - } - return ret; -} - -static int davinci_wdt_release(struct inode *inode, struct file *file) -{ - wdt_service(); - clear_bit(WDT_IN_USE, &wdt_status); - - return 0; -} - -static const struct file_operations davinci_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = davinci_wdt_write, - .ioctl = davinci_wdt_ioctl, - .open = davinci_wdt_open, - .release = davinci_wdt_release, -}; - -static struct miscdevice davinci_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &davinci_wdt_fops, -}; - -static int davinci_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 - "DaVinci 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 resource\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 *)(res->start); - - ret = misc_register(&davinci_wdt_miscdev); - if (ret < 0) { - printk(KERN_ERR MODULE_NAME "cannot register misc device\n"); - release_resource(wdt_mem); - kfree(wdt_mem); - } else { - set_bit(WDT_DEVICE_INITED, &wdt_status); - } - - return ret; -} - -static int davinci_wdt_remove(struct platform_device *pdev) -{ - misc_deregister(&davinci_wdt_miscdev); - 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 = davinci_wdt_probe, - .remove = davinci_wdt_remove, -}; - -static int __init davinci_wdt_init(void) -{ - return platform_driver_register(&platform_wdt_driver); -} - -static void __exit davinci_wdt_exit(void) -{ - return platform_driver_unregister(&platform_wdt_driver); -} - -module_init(davinci_wdt_init); -module_exit(davinci_wdt_exit); - -MODULE_AUTHOR("Texas Instruments"); -MODULE_DESCRIPTION("DaVinci 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_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |