diff options
Diffstat (limited to 'drivers/watchdog/adx_wdt.c')
-rw-r--r-- | drivers/watchdog/adx_wdt.c | 355 |
1 files changed, 0 insertions, 355 deletions
diff --git a/drivers/watchdog/adx_wdt.c b/drivers/watchdog/adx_wdt.c deleted file mode 100644 index af6e6b16475a..000000000000 --- a/drivers/watchdog/adx_wdt.c +++ /dev/null @@ -1,355 +0,0 @@ -/* - * Copyright (C) 2008-2009 Avionic Design GmbH - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/fs.h> -#include <linux/gfp.h> -#include <linux/io.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/types.h> -#include <linux/uaccess.h> -#include <linux/watchdog.h> - -#define WATCHDOG_NAME "adx-wdt" - -/* register offsets */ -#define ADX_WDT_CONTROL 0x00 -#define ADX_WDT_CONTROL_ENABLE (1 << 0) -#define ADX_WDT_CONTROL_nRESET (1 << 1) -#define ADX_WDT_TIMEOUT 0x08 - -static struct platform_device *adx_wdt_dev; -static unsigned long driver_open; - -#define WDT_STATE_STOP 0 -#define WDT_STATE_START 1 - -struct adx_wdt { - void __iomem *base; - unsigned long timeout; - unsigned int state; - unsigned int wake; - spinlock_t lock; -}; - -static const struct watchdog_info adx_wdt_info = { - .identity = "Avionic Design Xanthos Watchdog", - .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, -}; - -static void adx_wdt_start_locked(struct adx_wdt *wdt) -{ - u32 ctrl; - - ctrl = readl(wdt->base + ADX_WDT_CONTROL); - ctrl |= ADX_WDT_CONTROL_ENABLE; - writel(ctrl, wdt->base + ADX_WDT_CONTROL); - wdt->state = WDT_STATE_START; -} - -static void adx_wdt_start(struct adx_wdt *wdt) -{ - unsigned long flags; - - spin_lock_irqsave(&wdt->lock, flags); - adx_wdt_start_locked(wdt); - spin_unlock_irqrestore(&wdt->lock, flags); -} - -static void adx_wdt_stop_locked(struct adx_wdt *wdt) -{ - u32 ctrl; - - ctrl = readl(wdt->base + ADX_WDT_CONTROL); - ctrl &= ~ADX_WDT_CONTROL_ENABLE; - writel(ctrl, wdt->base + ADX_WDT_CONTROL); - wdt->state = WDT_STATE_STOP; -} - -static void adx_wdt_stop(struct adx_wdt *wdt) -{ - unsigned long flags; - - spin_lock_irqsave(&wdt->lock, flags); - adx_wdt_stop_locked(wdt); - spin_unlock_irqrestore(&wdt->lock, flags); -} - -static void adx_wdt_set_timeout(struct adx_wdt *wdt, unsigned long seconds) -{ - unsigned long timeout = seconds * 1000; - unsigned long flags; - unsigned int state; - - spin_lock_irqsave(&wdt->lock, flags); - state = wdt->state; - adx_wdt_stop_locked(wdt); - writel(timeout, wdt->base + ADX_WDT_TIMEOUT); - - if (state == WDT_STATE_START) - adx_wdt_start_locked(wdt); - - wdt->timeout = timeout; - spin_unlock_irqrestore(&wdt->lock, flags); -} - -static void adx_wdt_get_timeout(struct adx_wdt *wdt, unsigned long *seconds) -{ - *seconds = wdt->timeout / 1000; -} - -static void adx_wdt_keepalive(struct adx_wdt *wdt) -{ - unsigned long flags; - - spin_lock_irqsave(&wdt->lock, flags); - writel(wdt->timeout, wdt->base + ADX_WDT_TIMEOUT); - spin_unlock_irqrestore(&wdt->lock, flags); -} - -static int adx_wdt_open(struct inode *inode, struct file *file) -{ - struct adx_wdt *wdt = platform_get_drvdata(adx_wdt_dev); - - if (test_and_set_bit(0, &driver_open)) - return -EBUSY; - - file->private_data = wdt; - adx_wdt_set_timeout(wdt, 30); - adx_wdt_start(wdt); - - return nonseekable_open(inode, file); -} - -static int adx_wdt_release(struct inode *inode, struct file *file) -{ - struct adx_wdt *wdt = file->private_data; - - adx_wdt_stop(wdt); - clear_bit(0, &driver_open); - - return 0; -} - -static long adx_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) -{ - struct adx_wdt *wdt = file->private_data; - void __user *argp = (void __user *)arg; - unsigned long __user *p = argp; - unsigned long seconds = 0; - unsigned int options; - long ret = -EINVAL; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &adx_wdt_info, sizeof(adx_wdt_info))) - return -EFAULT; - else - return 0; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - - case WDIOC_KEEPALIVE: - adx_wdt_keepalive(wdt); - return 0; - - case WDIOC_SETTIMEOUT: - if (get_user(seconds, p)) - return -EFAULT; - - adx_wdt_set_timeout(wdt, seconds); - - /* fallthrough */ - case WDIOC_GETTIMEOUT: - adx_wdt_get_timeout(wdt, &seconds); - return put_user(seconds, p); - - case WDIOC_SETOPTIONS: - if (copy_from_user(&options, argp, sizeof(options))) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - adx_wdt_stop(wdt); - ret = 0; - } - - if (options & WDIOS_ENABLECARD) { - adx_wdt_start(wdt); - ret = 0; - } - - return ret; - - default: - break; - } - - return -ENOTTY; -} - -static ssize_t adx_wdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - struct adx_wdt *wdt = file->private_data; - - if (len) - adx_wdt_keepalive(wdt); - - return len; -} - -static const struct file_operations adx_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .open = adx_wdt_open, - .release = adx_wdt_release, - .unlocked_ioctl = adx_wdt_ioctl, - .write = adx_wdt_write, -}; - -static struct miscdevice adx_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &adx_wdt_fops, -}; - -static int __devinit adx_wdt_probe(struct platform_device *pdev) -{ - struct resource *res; - struct adx_wdt *wdt; - int ret = 0; - u32 ctrl; - - wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); - if (!wdt) { - dev_err(&pdev->dev, "cannot allocate WDT structure\n"); - return -ENOMEM; - } - - spin_lock_init(&wdt->lock); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "cannot obtain I/O memory region\n"); - return -ENXIO; - } - - res = devm_request_mem_region(&pdev->dev, res->start, - resource_size(res), res->name); - if (!res) { - dev_err(&pdev->dev, "cannot request I/O memory region\n"); - return -ENXIO; - } - - wdt->base = devm_ioremap_nocache(&pdev->dev, res->start, - resource_size(res)); - if (!wdt->base) { - dev_err(&pdev->dev, "cannot remap I/O memory region\n"); - return -ENXIO; - } - - /* disable watchdog and reboot on timeout */ - ctrl = readl(wdt->base + ADX_WDT_CONTROL); - ctrl &= ~ADX_WDT_CONTROL_ENABLE; - ctrl &= ~ADX_WDT_CONTROL_nRESET; - writel(ctrl, wdt->base + ADX_WDT_CONTROL); - - platform_set_drvdata(pdev, wdt); - adx_wdt_dev = pdev; - - ret = misc_register(&adx_wdt_miscdev); - if (ret) { - dev_err(&pdev->dev, "cannot register miscdev on minor %d " - "(err=%d)\n", WATCHDOG_MINOR, ret); - return ret; - } - - return 0; -} - -static int __devexit adx_wdt_remove(struct platform_device *pdev) -{ - struct adx_wdt *wdt = platform_get_drvdata(pdev); - - misc_deregister(&adx_wdt_miscdev); - adx_wdt_stop(wdt); - platform_set_drvdata(pdev, NULL); - - return 0; -} - -static void adx_wdt_shutdown(struct platform_device *pdev) -{ - struct adx_wdt *wdt = platform_get_drvdata(pdev); - adx_wdt_stop(wdt); -} - -#ifdef CONFIG_PM -static int adx_wdt_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct adx_wdt *wdt = platform_get_drvdata(pdev); - - wdt->wake = (wdt->state == WDT_STATE_START) ? 1 : 0; - adx_wdt_stop(wdt); - - return 0; -} - -static int adx_wdt_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct adx_wdt *wdt = platform_get_drvdata(pdev); - - if (wdt->wake) - adx_wdt_start(wdt); - - return 0; -} - -static const struct dev_pm_ops adx_wdt_pm_ops = { - .suspend = adx_wdt_suspend, - .resume = adx_wdt_resume, -}; - -# define ADX_WDT_PM_OPS (&adx_wdt_pm_ops) -#else -# define ADX_WDT_PM_OPS NULL -#endif - -static struct platform_driver adx_wdt_driver = { - .probe = adx_wdt_probe, - .remove = __devexit_p(adx_wdt_remove), - .shutdown = adx_wdt_shutdown, - .driver = { - .name = WATCHDOG_NAME, - .owner = THIS_MODULE, - .pm = ADX_WDT_PM_OPS, - }, -}; - -static int __init adx_wdt_init(void) -{ - return platform_driver_register(&adx_wdt_driver); -} - -static void __exit adx_wdt_exit(void) -{ - platform_driver_unregister(&adx_wdt_driver); -} - -module_init(adx_wdt_init); -module_exit(adx_wdt_exit); - -MODULE_DESCRIPTION("Avionic Design Xanthos Watchdog Driver"); -MODULE_LICENSE("GPL v2"); -MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |