From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/watchdog/ib700wdt.c | 382 +++++++++++++++++++++++++++++++++++++ 1 file changed, 382 insertions(+) create mode 100644 kernel/drivers/watchdog/ib700wdt.c (limited to 'kernel/drivers/watchdog/ib700wdt.c') diff --git a/kernel/drivers/watchdog/ib700wdt.c b/kernel/drivers/watchdog/ib700wdt.c new file mode 100644 index 000000000..f2e4e1eeb --- /dev/null +++ b/kernel/drivers/watchdog/ib700wdt.c @@ -0,0 +1,382 @@ +/* + * IB700 Single Board Computer WDT driver + * + * (c) Copyright 2001 Charles Howes + * + * Based on advantechwdt.c which is based on acquirewdt.c which + * is based on wdt.c. + * + * (c) Copyright 2000-2001 Marek Michalkiewicz + * + * Based on acquirewdt.c which is based on wdt.c. + * Original copyright messages: + * + * (c) Copyright 1996 Alan Cox , + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide + * warranty for any of this software. This material is provided + * "AS-IS" and at no charge. + * + * (c) Copyright 1995 Alan Cox + * + * 14-Dec-2001 Matt Domsch + * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT + * Added timeout module option to override default + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +static struct platform_device *ibwdt_platform_device; +static unsigned long ibwdt_is_open; +static DEFINE_SPINLOCK(ibwdt_lock); +static char expect_close; + +/* Module information */ +#define DRV_NAME "ib700wdt" + +/* + * + * Watchdog Timer Configuration + * + * The function of the watchdog timer is to reset the system + * automatically and is defined at I/O port 0443H. To enable the + * watchdog timer and allow the system to reset, write I/O port 0443H. + * To disable the timer, write I/O port 0441H for the system to stop the + * watchdog function. The timer has a tolerance of 20% for its + * intervals. + * + * The following describes how the timer should be programmed. + * + * Enabling Watchdog: + * MOV AX,000FH (Choose the values from 0 to F) + * MOV DX,0443H + * OUT DX,AX + * + * Disabling Watchdog: + * MOV AX,000FH (Any value is fine.) + * MOV DX,0441H + * OUT DX,AX + * + * Watchdog timer control table: + * Level Value Time/sec | Level Value Time/sec + * 1 F 0 | 9 7 16 + * 2 E 2 | 10 6 18 + * 3 D 4 | 11 5 20 + * 4 C 6 | 12 4 22 + * 5 B 8 | 13 3 24 + * 6 A 10 | 14 2 26 + * 7 9 12 | 15 1 28 + * 8 8 14 | 16 0 30 + * + */ + +#define WDT_STOP 0x441 +#define WDT_START 0x443 + +/* Default timeout */ +#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */ +static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, + "Watchdog timeout in seconds. 0<= timeout <=30, default=" + __MODULE_STRING(WATCHDOG_TIMEOUT) "."); + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + + +/* + * Watchdog Operations + */ + +static void ibwdt_ping(void) +{ + int wd_margin = 15 - ((timeout + 1) / 2); + + spin_lock(&ibwdt_lock); + + /* Write a watchdog value */ + outb_p(wd_margin, WDT_START); + + spin_unlock(&ibwdt_lock); +} + +static void ibwdt_disable(void) +{ + spin_lock(&ibwdt_lock); + outb_p(0, WDT_STOP); + spin_unlock(&ibwdt_lock); +} + +static int ibwdt_set_heartbeat(int t) +{ + if (t < 0 || t > 30) + return -EINVAL; + + timeout = t; + return 0; +} + +/* + * /dev/watchdog handling + */ + +static ssize_t ibwdt_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + if (count) { + if (!nowayout) { + size_t i; + + /* In case it was set long ago */ + expect_close = 0; + + for (i = 0; i != count; i++) { + char c; + if (get_user(c, buf + i)) + return -EFAULT; + if (c == 'V') + expect_close = 42; + } + } + ibwdt_ping(); + } + return count; +} + +static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int new_margin; + void __user *argp = (void __user *)arg; + int __user *p = argp; + + static const struct watchdog_info ident = { + .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT + | WDIOF_MAGICCLOSE, + .firmware_version = 1, + .identity = "IB700 WDT", + }; + + switch (cmd) { + case WDIOC_GETSUPPORT: + if (copy_to_user(argp, &ident, sizeof(ident))) + return -EFAULT; + break; + + case WDIOC_GETSTATUS: + case WDIOC_GETBOOTSTATUS: + return put_user(0, p); + + case WDIOC_SETOPTIONS: + { + int options, retval = -EINVAL; + + if (get_user(options, p)) + return -EFAULT; + + if (options & WDIOS_DISABLECARD) { + ibwdt_disable(); + retval = 0; + } + if (options & WDIOS_ENABLECARD) { + ibwdt_ping(); + retval = 0; + } + return retval; + } + case WDIOC_KEEPALIVE: + ibwdt_ping(); + break; + + case WDIOC_SETTIMEOUT: + if (get_user(new_margin, p)) + return -EFAULT; + if (ibwdt_set_heartbeat(new_margin)) + return -EINVAL; + ibwdt_ping(); + /* Fall */ + + case WDIOC_GETTIMEOUT: + return put_user(timeout, p); + + default: + return -ENOTTY; + } + return 0; +} + +static int ibwdt_open(struct inode *inode, struct file *file) +{ + if (test_and_set_bit(0, &ibwdt_is_open)) + return -EBUSY; + if (nowayout) + __module_get(THIS_MODULE); + + /* Activate */ + ibwdt_ping(); + return nonseekable_open(inode, file); +} + +static int ibwdt_close(struct inode *inode, struct file *file) +{ + if (expect_close == 42) { + ibwdt_disable(); + } else { + pr_crit("WDT device closed unexpectedly. WDT will not stop!\n"); + ibwdt_ping(); + } + clear_bit(0, &ibwdt_is_open); + expect_close = 0; + return 0; +} + +/* + * Kernel Interfaces + */ + +static const struct file_operations ibwdt_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .write = ibwdt_write, + .unlocked_ioctl = ibwdt_ioctl, + .open = ibwdt_open, + .release = ibwdt_close, +}; + +static struct miscdevice ibwdt_miscdev = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &ibwdt_fops, +}; + +/* + * Init & exit routines + */ + +static int __init ibwdt_probe(struct platform_device *dev) +{ + int res; + +#if WDT_START != WDT_STOP + if (!request_region(WDT_STOP, 1, "IB700 WDT")) { + pr_err("STOP method I/O %X is not available\n", WDT_STOP); + res = -EIO; + goto out_nostopreg; + } +#endif + + if (!request_region(WDT_START, 1, "IB700 WDT")) { + pr_err("START method I/O %X is not available\n", WDT_START); + res = -EIO; + goto out_nostartreg; + } + + /* Check that the heartbeat value is within it's range ; + * if not reset to the default */ + if (ibwdt_set_heartbeat(timeout)) { + ibwdt_set_heartbeat(WATCHDOG_TIMEOUT); + pr_info("timeout value must be 0<=x<=30, using %d\n", timeout); + } + + res = misc_register(&ibwdt_miscdev); + if (res) { + pr_err("failed to register misc device\n"); + goto out_nomisc; + } + return 0; + +out_nomisc: + release_region(WDT_START, 1); +out_nostartreg: +#if WDT_START != WDT_STOP + release_region(WDT_STOP, 1); +#endif +out_nostopreg: + return res; +} + +static int ibwdt_remove(struct platform_device *dev) +{ + misc_deregister(&ibwdt_miscdev); + release_region(WDT_START, 1); +#if WDT_START != WDT_STOP + release_region(WDT_STOP, 1); +#endif + return 0; +} + +static void ibwdt_shutdown(struct platform_device *dev) +{ + /* Turn the WDT off if we have a soft shutdown */ + ibwdt_disable(); +} + +static struct platform_driver ibwdt_driver = { + .remove = ibwdt_remove, + .shutdown = ibwdt_shutdown, + .driver = { + .name = DRV_NAME, + }, +}; + +static int __init ibwdt_init(void) +{ + int err; + + pr_info("WDT driver for IB700 single board computer initialising\n"); + + ibwdt_platform_device = platform_device_register_simple(DRV_NAME, + -1, NULL, 0); + if (IS_ERR(ibwdt_platform_device)) + return PTR_ERR(ibwdt_platform_device); + + err = platform_driver_probe(&ibwdt_driver, ibwdt_probe); + if (err) + goto unreg_platform_device; + + return 0; + +unreg_platform_device: + platform_device_unregister(ibwdt_platform_device); + return err; +} + +static void __exit ibwdt_exit(void) +{ + platform_device_unregister(ibwdt_platform_device); + platform_driver_unregister(&ibwdt_driver); + pr_info("Watchdog Module Unloaded\n"); +} + +module_init(ibwdt_init); +module_exit(ibwdt_exit); + +MODULE_AUTHOR("Charles Howes "); +MODULE_DESCRIPTION("IB700 SBC watchdog driver"); +MODULE_LICENSE("GPL"); + +/* end of ib700wdt.c */ -- cgit 1.2.3-korg