diff options
Diffstat (limited to 'drivers/watchdog/iop_wdt.c')
| -rw-r--r-- | drivers/watchdog/iop_wdt.c | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/drivers/watchdog/iop_wdt.c b/drivers/watchdog/iop_wdt.c deleted file mode 100644 index 6bf68d4750de..000000000000 --- a/drivers/watchdog/iop_wdt.c +++ /dev/null @@ -1,250 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * drivers/char/watchdog/iop_wdt.c - * - * WDT driver for Intel I/O Processors - * Copyright (C) 2005, Intel Corporation. - * - * Based on ixp4xx driver, Copyright 2004 (c) MontaVista, Software, Inc. - * - * Curt E Bruns <curt.e.bruns@intel.com> - * Peter Milne <peter.milne@d-tacq.com> - * Dan Williams <dan.j.williams@intel.com> - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/device.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/uaccess.h> -#include <mach/hardware.h> - -static bool nowayout = WATCHDOG_NOWAYOUT; -static unsigned long wdt_status; -static unsigned long boot_status; -static DEFINE_SPINLOCK(wdt_lock); - -#define WDT_IN_USE 0 -#define WDT_OK_TO_CLOSE 1 -#define WDT_ENABLED 2 - -static unsigned long iop_watchdog_timeout(void) -{ - return (0xffffffffUL / get_iop_tick_rate()); -} - -/** - * wdt_supports_disable - determine if we are accessing a iop13xx watchdog - * or iop3xx by whether it has a disable command - */ -static int wdt_supports_disable(void) -{ - int can_disable; - - if (IOP_WDTCR_EN_ARM != IOP_WDTCR_DIS_ARM) - can_disable = 1; - else - can_disable = 0; - - return can_disable; -} - -static void wdt_enable(void) -{ - /* Arm and enable the Timer to starting counting down from 0xFFFF.FFFF - * Takes approx. 10.7s to timeout - */ - spin_lock(&wdt_lock); - write_wdtcr(IOP_WDTCR_EN_ARM); - write_wdtcr(IOP_WDTCR_EN); - spin_unlock(&wdt_lock); -} - -/* returns 0 if the timer was successfully disabled */ -static int wdt_disable(void) -{ - /* Stop Counting */ - if (wdt_supports_disable()) { - spin_lock(&wdt_lock); - write_wdtcr(IOP_WDTCR_DIS_ARM); - write_wdtcr(IOP_WDTCR_DIS); - clear_bit(WDT_ENABLED, &wdt_status); - spin_unlock(&wdt_lock); - pr_info("Disabled\n"); - return 0; - } else - return 1; -} - -static int iop_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(); - set_bit(WDT_ENABLED, &wdt_status); - return stream_open(inode, file); -} - -static ssize_t iop_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 const struct watchdog_info ident = { - .options = WDIOF_CARDRESET | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, - .identity = "iop watchdog", -}; - -static long iop_wdt_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - int options; - int ret = -ENOTTY; - int __user *argp = (int __user *)arg; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user(argp, &ident, sizeof(ident))) - ret = -EFAULT; - else - ret = 0; - break; - - case WDIOC_GETSTATUS: - ret = put_user(0, argp); - break; - - case WDIOC_GETBOOTSTATUS: - ret = put_user(boot_status, argp); - break; - - case WDIOC_SETOPTIONS: - if (get_user(options, (int *)arg)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - if (!nowayout) { - if (wdt_disable() == 0) { - set_bit(WDT_OK_TO_CLOSE, &wdt_status); - ret = 0; - } else - ret = -ENXIO; - } else - ret = 0; - } - if (options & WDIOS_ENABLECARD) { - wdt_enable(); - ret = 0; - } - break; - - case WDIOC_KEEPALIVE: - wdt_enable(); - ret = 0; - break; - - case WDIOC_GETTIMEOUT: - ret = put_user(iop_watchdog_timeout(), argp); - break; - } - return ret; -} - -static int iop_wdt_release(struct inode *inode, struct file *file) -{ - int state = 1; - if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) - if (test_bit(WDT_ENABLED, &wdt_status)) - state = wdt_disable(); - - /* if the timer is not disabled reload and notify that we are still - * going down - */ - if (state != 0) { - wdt_enable(); - pr_crit("Device closed unexpectedly - reset in %lu seconds\n", - iop_watchdog_timeout()); - } - - clear_bit(WDT_IN_USE, &wdt_status); - clear_bit(WDT_OK_TO_CLOSE, &wdt_status); - - return 0; -} - -static const struct file_operations iop_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = iop_wdt_write, - .unlocked_ioctl = iop_wdt_ioctl, - .compat_ioctl = compat_ptr_ioctl, - .open = iop_wdt_open, - .release = iop_wdt_release, -}; - -static struct miscdevice iop_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &iop_wdt_fops, -}; - -static int __init iop_wdt_init(void) -{ - int ret; - - /* check if the reset was caused by the watchdog timer */ - boot_status = (read_rcsr() & IOP_RCSR_WDT) ? WDIOF_CARDRESET : 0; - - /* Configure Watchdog Timeout to cause an Internal Bus (IB) Reset - * NOTE: An IB Reset will Reset both cores in the IOP342 - */ - write_wdtsr(IOP13XX_WDTCR_IB_RESET); - - /* Register after we have the device set up so we cannot race - with an open */ - ret = misc_register(&iop_wdt_miscdev); - if (ret == 0) - pr_info("timeout %lu sec\n", iop_watchdog_timeout()); - - return ret; -} - -static void __exit iop_wdt_exit(void) -{ - misc_deregister(&iop_wdt_miscdev); -} - -module_init(iop_wdt_init); -module_exit(iop_wdt_exit); - -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); - -MODULE_AUTHOR("Curt E Bruns <curt.e.bruns@intel.com>"); -MODULE_DESCRIPTION("iop watchdog timer driver"); -MODULE_LICENSE("GPL"); |