diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/watchdog/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/watchdog/Makefile | 3 | ||||
| -rw-r--r-- | drivers/watchdog/bfin_wdt.c | 476 |
3 files changed, 0 insertions, 492 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 79020ce95de2..de6847d7b4e3 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -815,19 +815,6 @@ config SPRD_WATCHDOG Say Y here to include watchdog timer supported by Spreadtrum system. -# BLACKFIN Architecture - -config BFIN_WDT - tristate "Blackfin On-Chip Watchdog Timer" - depends on BLACKFIN - ---help--- - If you say yes here you will get support for the Blackfin On-Chip - Watchdog Timer. If you have one of these processors and wish to - have watchdog support enabled, say Y, otherwise say N. - - To compile this driver as a module, choose M here: the - module will be called bfin_wdt. - # X86 (i386 + ia64 + x86_64) Architecture config ACQUIRE_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 1f9a0235f22c..e4dd91f5585a 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -91,9 +91,6 @@ obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o -# BLACKFIN Architecture -obj-$(CONFIG_BFIN_WDT) += bfin_wdt.o - # X86 (i386 + ia64 + x86_64) Architecture obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o diff --git a/drivers/watchdog/bfin_wdt.c b/drivers/watchdog/bfin_wdt.c deleted file mode 100644 index aa4d2e8a8ef9..000000000000 --- a/drivers/watchdog/bfin_wdt.c +++ /dev/null @@ -1,476 +0,0 @@ -/* - * Blackfin On-Chip Watchdog Driver - * - * Originally based on softdog.c - * Copyright 2006-2010 Analog Devices Inc. - * Copyright 2006-2007 Michele d'Amico - * Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk> - * - * Enter bugs at http://blackfin.uclinux.org/ - * - * Licensed under the GPL-2 or later. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/platform_device.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/timer.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/uaccess.h> -#include <asm/blackfin.h> -#include <asm/bfin_watchdog.h> - -#define stamp(fmt, args...) \ - pr_debug("%s:%i: " fmt "\n", __func__, __LINE__, ## args) -#define stampit() stamp("here i am") - -#define WATCHDOG_NAME "bfin-wdt" - -/* The BF561 has two watchdogs (one per core), but since Linux - * only runs on core A, we'll just work with that one. - */ -#ifdef BF561_FAMILY -# define bfin_read_WDOG_CTL() bfin_read_WDOGA_CTL() -# define bfin_read_WDOG_CNT() bfin_read_WDOGA_CNT() -# define bfin_read_WDOG_STAT() bfin_read_WDOGA_STAT() -# define bfin_write_WDOG_CTL(x) bfin_write_WDOGA_CTL(x) -# define bfin_write_WDOG_CNT(x) bfin_write_WDOGA_CNT(x) -# define bfin_write_WDOG_STAT(x) bfin_write_WDOGA_STAT(x) -#endif - -/* some defaults */ -#define WATCHDOG_TIMEOUT 20 - -static unsigned int timeout = WATCHDOG_TIMEOUT; -static bool nowayout = WATCHDOG_NOWAYOUT; -static const struct watchdog_info bfin_wdt_info; -static unsigned long open_check; -static char expect_close; -static DEFINE_SPINLOCK(bfin_wdt_spinlock); - -/** - * bfin_wdt_keepalive - Keep the Userspace Watchdog Alive - * - * The Userspace watchdog got a KeepAlive: schedule the next timeout. - */ -static int bfin_wdt_keepalive(void) -{ - stampit(); - bfin_write_WDOG_STAT(0); - return 0; -} - -/** - * bfin_wdt_stop - Stop the Watchdog - * - * Stops the on-chip watchdog. - */ -static int bfin_wdt_stop(void) -{ - stampit(); - bfin_write_WDOG_CTL(WDEN_DISABLE); - return 0; -} - -/** - * bfin_wdt_start - Start the Watchdog - * - * Starts the on-chip watchdog. Automatically loads WDOG_CNT - * into WDOG_STAT for us. - */ -static int bfin_wdt_start(void) -{ - stampit(); - bfin_write_WDOG_CTL(WDEN_ENABLE | ICTL_RESET); - return 0; -} - -/** - * bfin_wdt_running - Check Watchdog status - * - * See if the watchdog is running. - */ -static int bfin_wdt_running(void) -{ - stampit(); - return ((bfin_read_WDOG_CTL() & WDEN_MASK) != WDEN_DISABLE); -} - -/** - * bfin_wdt_set_timeout - Set the Userspace Watchdog timeout - * @t: new timeout value (in seconds) - * - * Translate the specified timeout in seconds into System Clock - * terms which is what the on-chip Watchdog requires. - */ -static int bfin_wdt_set_timeout(unsigned long t) -{ - u32 cnt, max_t, sclk; - unsigned long flags; - - sclk = get_sclk(); - max_t = -1 / sclk; - cnt = t * sclk; - stamp("maxtimeout=%us newtimeout=%lus (cnt=%#x)", max_t, t, cnt); - - if (t > max_t) { - pr_warn("timeout value is too large\n"); - return -EINVAL; - } - - spin_lock_irqsave(&bfin_wdt_spinlock, flags); - { - int run = bfin_wdt_running(); - bfin_wdt_stop(); - bfin_write_WDOG_CNT(cnt); - if (run) - bfin_wdt_start(); - } - spin_unlock_irqrestore(&bfin_wdt_spinlock, flags); - - timeout = t; - - return 0; -} - -/** - * bfin_wdt_open - Open the Device - * @inode: inode of device - * @file: file handle of device - * - * Watchdog device is opened and started. - */ -static int bfin_wdt_open(struct inode *inode, struct file *file) -{ - stampit(); - - if (test_and_set_bit(0, &open_check)) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - bfin_wdt_keepalive(); - bfin_wdt_start(); - - return nonseekable_open(inode, file); -} - -/** - * bfin_wdt_close - Close the Device - * @inode: inode of device - * @file: file handle of device - * - * Watchdog device is closed and stopped. - */ -static int bfin_wdt_release(struct inode *inode, struct file *file) -{ - stampit(); - - if (expect_close == 42) - bfin_wdt_stop(); - else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - bfin_wdt_keepalive(); - } - expect_close = 0; - clear_bit(0, &open_check); - return 0; -} - -/** - * bfin_wdt_write - Write to Device - * @file: file handle of device - * @buf: buffer to write - * @count: length of buffer - * @ppos: offset - * - * Pings the watchdog on write. - */ -static ssize_t bfin_wdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - stampit(); - - if (len) { - if (!nowayout) { - size_t i; - - /* In case it was set long ago */ - expect_close = 0; - - for (i = 0; i != len; i++) { - char c; - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - bfin_wdt_keepalive(); - } - - return len; -} - -/** - * bfin_wdt_ioctl - Query Device - * @file: file handle of device - * @cmd: watchdog command - * @arg: argument - * - * Query basic information from the device or ping it, as outlined by the - * watchdog API. - */ -static long bfin_wdt_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - - stampit(); - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &bfin_wdt_info, sizeof(bfin_wdt_info))) - return -EFAULT; - else - return 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(!!(_bfin_swrst & SWRST_RESET_WDOG), p); - case WDIOC_SETOPTIONS: { - unsigned long flags; - int options, ret = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - spin_lock_irqsave(&bfin_wdt_spinlock, flags); - if (options & WDIOS_DISABLECARD) { - bfin_wdt_stop(); - ret = 0; - } - if (options & WDIOS_ENABLECARD) { - bfin_wdt_start(); - ret = 0; - } - spin_unlock_irqrestore(&bfin_wdt_spinlock, flags); - return ret; - } - case WDIOC_KEEPALIVE: - bfin_wdt_keepalive(); - return 0; - case WDIOC_SETTIMEOUT: { - int new_timeout; - - if (get_user(new_timeout, p)) - return -EFAULT; - if (bfin_wdt_set_timeout(new_timeout)) - return -EINVAL; - } - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - default: - return -ENOTTY; - } -} - -#ifdef CONFIG_PM -static int state_before_suspend; - -/** - * bfin_wdt_suspend - suspend the watchdog - * @pdev: device being suspended - * @state: requested suspend state - * - * Remember if the watchdog was running and stop it. - * TODO: is this even right? Doesn't seem to be any - * standard in the watchdog world ... - */ -static int bfin_wdt_suspend(struct platform_device *pdev, pm_message_t state) -{ - stampit(); - - state_before_suspend = bfin_wdt_running(); - bfin_wdt_stop(); - - return 0; -} - -/** - * bfin_wdt_resume - resume the watchdog - * @pdev: device being resumed - * - * If the watchdog was running, turn it back on. - */ -static int bfin_wdt_resume(struct platform_device *pdev) -{ - stampit(); - - if (state_before_suspend) { - bfin_wdt_set_timeout(timeout); - bfin_wdt_start(); - } - - return 0; -} -#else -# define bfin_wdt_suspend NULL -# define bfin_wdt_resume NULL -#endif - -static const struct file_operations bfin_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = bfin_wdt_write, - .unlocked_ioctl = bfin_wdt_ioctl, - .open = bfin_wdt_open, - .release = bfin_wdt_release, -}; - -static struct miscdevice bfin_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &bfin_wdt_fops, -}; - -static const struct watchdog_info bfin_wdt_info = { - .identity = "Blackfin Watchdog", - .options = WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, -}; - -/** - * bfin_wdt_probe - Initialize module - * - * Registers the misc device. Actual device - * initialization is handled by bfin_wdt_open(). - */ -static int bfin_wdt_probe(struct platform_device *pdev) -{ - int ret; - - ret = misc_register(&bfin_wdt_miscdev); - if (ret) { - pr_err("cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - return ret; - } - - pr_info("initialized: timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - - return 0; -} - -/** - * bfin_wdt_remove - Initialize module - * - * Unregisters the misc device. Actual device - * deinitialization is handled by bfin_wdt_close(). - */ -static int bfin_wdt_remove(struct platform_device *pdev) -{ - misc_deregister(&bfin_wdt_miscdev); - return 0; -} - -/** - * bfin_wdt_shutdown - Soft Shutdown Handler - * - * Handles the soft shutdown event. - */ -static void bfin_wdt_shutdown(struct platform_device *pdev) -{ - stampit(); - - bfin_wdt_stop(); -} - -static struct platform_device *bfin_wdt_device; - -static struct platform_driver bfin_wdt_driver = { - .probe = bfin_wdt_probe, - .remove = bfin_wdt_remove, - .shutdown = bfin_wdt_shutdown, - .suspend = bfin_wdt_suspend, - .resume = bfin_wdt_resume, - .driver = { - .name = WATCHDOG_NAME, - }, -}; - -/** - * bfin_wdt_init - Initialize module - * - * Checks the module params and registers the platform device & driver. - * Real work is in the platform probe function. - */ -static int __init bfin_wdt_init(void) -{ - int ret; - - stampit(); - - /* Check that the timeout value is within range */ - if (bfin_wdt_set_timeout(timeout)) - return -EINVAL; - - /* Since this is an on-chip device and needs no board-specific - * resources, we'll handle all the platform device stuff here. - */ - ret = platform_driver_register(&bfin_wdt_driver); - if (ret) { - pr_err("unable to register driver\n"); - return ret; - } - - bfin_wdt_device = platform_device_register_simple(WATCHDOG_NAME, - -1, NULL, 0); - if (IS_ERR(bfin_wdt_device)) { - pr_err("unable to register device\n"); - platform_driver_unregister(&bfin_wdt_driver); - return PTR_ERR(bfin_wdt_device); - } - - return 0; -} - -/** - * bfin_wdt_exit - Deinitialize module - * - * Back out the platform device & driver steps. Real work is in the - * platform remove function. - */ -static void __exit bfin_wdt_exit(void) -{ - platform_device_unregister(bfin_wdt_device); - platform_driver_unregister(&bfin_wdt_driver); -} - -module_init(bfin_wdt_init); -module_exit(bfin_wdt_exit); - -MODULE_AUTHOR("Michele d'Amico, Mike Frysinger <vapier@gentoo.org>"); -MODULE_DESCRIPTION("Blackfin Watchdog Device Driver"); -MODULE_LICENSE("GPL"); - -module_param(timeout, uint, 0); -MODULE_PARM_DESC(timeout, - "Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default=" - __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); - -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |