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Release 4.11 drivers/watchdog/it87_wdt.c

Directory: drivers/watchdog
/*
 *      Watchdog Timer Driver
 *         for ITE IT87xx Environment Control - Low Pin Count Input / Output
 *
 *      (c) Copyright 2007  Oliver Schuster <olivers137@aol.com>
 *
 *      Based on softdog.c      by Alan Cox,
 *               83977f_wdt.c   by Jose Goncalves,
 *               it87.c         by Chris Gauthron, Jean Delvare
 *
 *      Data-sheets: Publicly available at the ITE website
 *                  http://www.ite.com.tw/
 *
 *      Support of the watchdog timers, which are available on
 *      IT8620, IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726,
 *      IT8728 and IT8783.
 *
 *      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.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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/init.h>
#include <linux/ioport.h>
#include <linux/watchdog.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/uaccess.h>
#include <linux/io.h>



#define WATCHDOG_VERSION	"1.14"

#define WATCHDOG_NAME		"IT87 WDT"

#define DRIVER_VERSION		WATCHDOG_NAME " driver, v" WATCHDOG_VERSION "\n"

#define WD_MAGIC		'V'

/* Defaults for Module Parameter */

#define DEFAULT_NOGAMEPORT	0

#define DEFAULT_NOCIR		0

#define DEFAULT_EXCLUSIVE	1

#define DEFAULT_TIMEOUT		60

#define DEFAULT_TESTMODE	0

#define DEFAULT_NOWAYOUT	WATCHDOG_NOWAYOUT

/* IO Ports */

#define REG		0x2e

#define VAL		0x2f

/* Logical device Numbers LDN */

#define GPIO		0x07

#define GAMEPORT	0x09

#define CIR		0x0a

/* Configuration Registers and Functions */

#define LDNREG		0x07

#define CHIPID		0x20

#define CHIPREV		0x22

#define ACTREG		0x30

#define BASEREG		0x60

/* Chip Id numbers */

#define NO_DEV_ID	0xffff

#define IT8620_ID	0x8620

#define IT8702_ID	0x8702

#define IT8705_ID	0x8705

#define IT8712_ID	0x8712

#define IT8716_ID	0x8716

#define IT8718_ID	0x8718

#define IT8720_ID	0x8720

#define IT8721_ID	0x8721

#define IT8726_ID	0x8726	
/* the data sheet suggest wrongly 0x8716 */

#define IT8728_ID	0x8728

#define IT8783_ID	0x8783

/* GPIO Configuration Registers LDN=0x07 */

#define WDTCTRL		0x71

#define WDTCFG		0x72

#define WDTVALLSB	0x73

#define WDTVALMSB	0x74

/* GPIO Bits WDTCTRL */

#define WDT_CIRINT	0x80

#define WDT_MOUSEINT	0x40

#define WDT_KYBINT	0x20

#define WDT_GAMEPORT	0x10 
/* not in it8718, it8720, it8721, it8728 */

#define WDT_FORCE	0x02

#define WDT_ZERO	0x01

/* GPIO Bits WDTCFG */

#define WDT_TOV1	0x80

#define WDT_KRST	0x40

#define WDT_TOVE	0x20

#define WDT_PWROK	0x10 
/* not in it8721 */

#define WDT_INT_MASK	0x0f

/* CIR Configuration Register LDN=0x0a */

#define CIR_ILS		0x70

/* The default Base address is not always available, we use this */

#define CIR_BASE	0x0208

/* CIR Controller */

#define CIR_DR(b)	(b)

#define CIR_IER(b)	(b + 1)

#define CIR_RCR(b)	(b + 2)

#define CIR_TCR1(b)	(b + 3)

#define CIR_TCR2(b)	(b + 4)

#define CIR_TSR(b)	(b + 5)

#define CIR_RSR(b)	(b + 6)

#define CIR_BDLR(b)	(b + 5)

#define CIR_BDHR(b)	(b + 6)

#define CIR_IIR(b)	(b + 7)

/* Default Base address of Game port */

#define GP_BASE_DEFAULT	0x0201

/* wdt_status */

#define WDTS_TIMER_RUN	0

#define WDTS_DEV_OPEN	1

#define WDTS_KEEPALIVE	2

#define WDTS_LOCKED	3

#define WDTS_USE_GP	4

#define WDTS_EXPECTED	5

#define WDTS_USE_CIR	6






static	unsigned int base, gpact, ciract, max_units, chip_type;

static	unsigned long wdt_status;


static	int nogameport = DEFAULT_NOGAMEPORT;

static int nocir      = DEFAULT_NOCIR;

static	int exclusive  = DEFAULT_EXCLUSIVE;

static	int timeout    = DEFAULT_TIMEOUT;

static	int testmode   = DEFAULT_TESTMODE;

static	bool nowayout   = DEFAULT_NOWAYOUT;

module_param(nogameport, int, 0);
MODULE_PARM_DESC(nogameport, "Forbid the activation of game port, default="
		__MODULE_STRING(DEFAULT_NOGAMEPORT));
module_param(nocir, int, 0);
MODULE_PARM_DESC(nocir, "Forbid the use of Consumer IR interrupts to reset timer, default="
		__MODULE_STRING(DEFAULT_NOCIR));
module_param(exclusive, int, 0);
MODULE_PARM_DESC(exclusive, "Watchdog exclusive device open, default="
		__MODULE_STRING(DEFAULT_EXCLUSIVE));
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, default="
		__MODULE_STRING(DEFAULT_TIMEOUT));
module_param(testmode, int, 0);
MODULE_PARM_DESC(testmode, "Watchdog test mode (1 = no reboot), default="
		__MODULE_STRING(DEFAULT_TESTMODE));
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started, default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT));

/* Superio Chip */


static inline int superio_enter(void) { /* * Try to reserve REG and REG + 1 for exclusive access. */ if (!request_muxed_region(REG, 2, WATCHDOG_NAME)) return -EBUSY; outb(0x87, REG); outb(0x01, REG); outb(0x55, REG); outb(0x55, REG); return 0; }

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static inline void superio_exit(void) { outb(0x02, REG); outb(0x02, VAL); release_region(REG, 2); }

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static inline void superio_select(int ldn) { outb(LDNREG, REG); outb(ldn, VAL); }

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static inline int superio_inb(int reg) { outb(reg, REG); return inb(VAL); }

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static inline void superio_outb(int val, int reg) { outb(reg, REG); outb(val, VAL); }

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static inline int superio_inw(int reg) { int val; outb(reg++, REG); val = inb(VAL) << 8; outb(reg, REG); val |= inb(VAL); return val; }

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static inline void superio_outw(int val, int reg) { outb(reg++, REG); outb(val >> 8, VAL); outb(reg, REG); outb(val, VAL); }

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/* Internal function, should be called after superio_select(GPIO) */
static void wdt_update_timeout(void) { unsigned char cfg = WDT_KRST; int tm = timeout; if (testmode) cfg = 0; if (tm <= max_units) cfg |= WDT_TOV1; else tm /= 60; if (chip_type != IT8721_ID) cfg |= WDT_PWROK; superio_outb(cfg, WDTCFG); superio_outb(tm, WDTVALLSB); if (max_units > 255) superio_outb(tm>>8, WDTVALMSB); }

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static int wdt_round_time(int t) { t += 59; t -= t % 60; return t; }

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/* watchdog timer handling */
static void wdt_keepalive(void) { if (test_bit(WDTS_USE_GP, &wdt_status)) inb(base); else if (test_bit(WDTS_USE_CIR, &wdt_status)) /* The timer reloads with around 5 msec delay */ outb(0x55, CIR_DR(base)); else { if (superio_enter()) return; superio_select(GPIO); wdt_update_timeout(); superio_exit(); } set_bit(WDTS_KEEPALIVE, &wdt_status); }

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Oliver Schuster4257.53%150.00%
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static int wdt_start(void) { int ret = superio_enter(); if (ret) return ret; superio_select(GPIO); if (test_bit(WDTS_USE_GP, &wdt_status)) superio_outb(WDT_GAMEPORT, WDTCTRL); else if (test_bit(WDTS_USE_CIR, &wdt_status)) superio_outb(WDT_CIRINT, WDTCTRL); wdt_update_timeout(); superio_exit(); return 0; }

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Oliver Schuster4260.00%125.00%
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Marc van der Wal1115.71%125.00%
Ondrej Zajicek22.86%125.00%
Total70100.00%4100.00%


static int wdt_stop(void) { int ret = superio_enter(); if (ret) return ret; superio_select(GPIO); superio_outb(0x00, WDTCTRL); superio_outb(WDT_TOV1, WDTCFG); superio_outb(0x00, WDTVALLSB); if (max_units > 255) superio_outb(0x00, WDTVALMSB); superio_exit(); return 0; }

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Oliver Schuster4365.15%133.33%
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Ondrej Zajicek812.12%133.33%
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/** * wdt_set_timeout - set a new timeout value with watchdog ioctl * @t: timeout value in seconds * * The hardware device has a 8 or 16 bit watchdog timer (depends on * chip version) that can be configured to count seconds or minutes. * * Used within WDIOC_SETTIMEOUT watchdog device ioctl. */
static int wdt_set_timeout(int t) { if (t < 1 || t > max_units * 60) return -EINVAL; if (t > max_units) timeout = wdt_round_time(t); else timeout = t; if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { int ret = superio_enter(); if (ret) return ret; superio_select(GPIO); wdt_update_timeout(); superio_exit(); } return 0; }

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Oliver Schuster5263.41%133.33%
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/** * wdt_get_status - determines the status supported by watchdog ioctl * @status: status returned to user space * * The status bit of the device does not allow to distinguish * between a regular system reset and a watchdog forced reset. * But, in test mode it is useful, so it is supported through * WDIOC_GETSTATUS watchdog ioctl. Additionally the driver * reports the keepalive signal and the acception of the magic. * * Used within WDIOC_GETSTATUS watchdog device ioctl. */
static int wdt_get_status(int *status) { *status = 0; if (testmode) { int ret = superio_enter(); if (ret) return ret; superio_select(GPIO); if (superio_inb(WDTCTRL) & WDT_ZERO) { superio_outb(0x00, WDTCTRL); clear_bit(WDTS_TIMER_RUN, &wdt_status); *status |= WDIOF_CARDRESET; } superio_exit(); } if (test_and_clear_bit(WDTS_KEEPALIVE, &wdt_status)) *status |= WDIOF_KEEPALIVEPING; if (test_bit(WDTS_EXPECTED, &wdt_status)) *status |= WDIOF_MAGICCLOSE; return 0; }

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/* /dev/watchdog handling */ /** * wdt_open - watchdog file_operations .open * @inode: inode of the device * @file: file handle to the device * * The watchdog timer starts by opening the device. * * Used within the file operation of the watchdog device. */
static int wdt_open(struct inode *inode, struct file *file) { if (exclusive && test_and_set_bit(WDTS_DEV_OPEN, &wdt_status)) return -EBUSY; if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { int ret; if (nowayout && !test_and_set_bit(WDTS_LOCKED, &wdt_status)) __module_get(THIS_MODULE); ret = wdt_start(); if (ret) { clear_bit(WDTS_LOCKED, &wdt_status); clear_bit(WDTS_TIMER_RUN, &wdt_status); clear_bit(WDTS_DEV_OPEN, &wdt_status); return ret; } } return nonseekable_open(inode, file); }

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/** * wdt_release - watchdog file_operations .release * @inode: inode of the device * @file: file handle to the device * * Closing the watchdog device either stops the watchdog timer * or in the case, that nowayout is set or the magic character * wasn't written, a critical warning about an running watchdog * timer is given. * * Used within the file operation of the watchdog device. */
static int wdt_release(struct inode *inode, struct file *file) { if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { if (test_and_clear_bit(WDTS_EXPECTED, &wdt_status)) { int ret = wdt_stop(); if (ret) { /* * Stop failed. Just keep the watchdog alive * and hope nothing bad happens. */ set_bit(WDTS_EXPECTED, &wdt_status); wdt_keepalive(); return ret; } clear_bit(WDTS_TIMER_RUN, &wdt_status); } else { wdt_keepalive(); pr_crit("unexpected close, not stopping watchdog!\n"); } } clear_bit(WDTS_DEV_OPEN, &wdt_status); return 0; }

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/** * wdt_write - watchdog file_operations .write * @file: file handle to the watchdog * @buf: buffer to write * @count: count of bytes * @ppos: pointer to the position to write. No seeks allowed * * A write to a watchdog device is defined as a keepalive signal. Any * write of data will do, as we don't define content meaning. * * Used within the file operation of the watchdog device. */
static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { if (count) { clear_bit(WDTS_EXPECTED, &wdt_status); wdt_keepalive(); } if (!nowayout) { size_t ofs; /* note: just in case someone wrote the magic character long ago */ for (ofs = 0; ofs != count; ofs++) { char c; if (get_user(c, buf + ofs)) return -EFAULT; if (c == WD_MAGIC) set_bit(WDTS_EXPECTED, &wdt_status); } } return count; }

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static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, .firmware_version = 1, .identity = WATCHDOG_NAME, }; /** * wdt_ioctl - watchdog file_operations .unlocked_ioctl * @file: file handle to the device * @cmd: watchdog command * @arg: argument pointer * * The watchdog API defines a common set of functions for all watchdogs * according to their available features. * * Used within the file operation of the watchdog device. */
static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int rc = 0, status, new_options, new_timeout; union { struct watchdog_info __user *ident; int __user *i; } uarg; uarg.i = (int __user *)arg; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(uarg.ident, &ident, sizeof(ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: rc = wdt_get_status(&status); if (rc) return rc; return put_user(status, uarg.i); case WDIOC_GETBOOTSTATUS: return put_user(0, uarg.i); case WDIOC_KEEPALIVE: wdt_keepalive(); return 0; case WDIOC_SETOPTIONS: if (get_user(new_options, uarg.i)) return -EFAULT; switch (new_options) { case WDIOS_DISABLECARD: if (test_bit(WDTS_TIMER_RUN, &wdt_status)) { rc = wdt_stop(); if (rc) return rc; } clear_bit(WDTS_TIMER_RUN, &wdt_status); return 0; case WDIOS_ENABLECARD: if (!test_and_set_bit(WDTS_TIMER_RUN, &wdt_status)) { rc = wdt_start(); if (rc) { clear_bit(WDTS_TIMER_RUN, &wdt_status); return rc; } } return 0; default: return -EFAULT; } case WDIOC_SETTIMEOUT: if (get_user(new_timeout, uarg.i)) return -EFAULT; rc = wdt_set_timeout(new_timeout); case WDIOC_GETTIMEOUT: if (put_user(timeout, uarg.i)) return -EFAULT; return rc; default: return -ENOTTY; } }

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static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) wdt_stop(); return NOTIFY_DONE; }

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static const struct file_operations wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = wdt_write, .unlocked_ioctl = wdt_ioctl, .open = wdt_open, .release = wdt_release, }; static struct miscdevice wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &wdt_fops, }; static struct notifier_block wdt_notifier = { .notifier_call = wdt_notify_sys, };
static int __init it87_wdt_init(void) { int rc = 0; int try_gameport = !nogameport; u8 chip_rev; int gp_rreq_fail = 0; wdt_status = 0; rc = superio_enter(); if (rc) return rc; chip_type = superio_inw(CHIPID); chip_rev = superio_inb(CHIPREV) & 0x0f; superio_exit(); switch (chip_type) { case IT8702_ID: max_units = 255; break; case IT8712_ID: max_units = (chip_rev < 8) ? 255 : 65535; break; case IT8716_ID: case IT8726_ID: max_units = 65535; break; case IT8620_ID: case IT8718_ID: case IT8720_ID: case IT8721_ID: case IT8728_ID: case IT8783_ID: max_units = 65535; try_gameport = 0; break; case IT8705_ID: pr_err("Unsupported Chip found, Chip %04x Revision %02x\n", chip_type, chip_rev); return -ENODEV; case NO_DEV_ID: pr_err("no device\n"); return -ENODEV; default: pr_err("Unknown Chip found, Chip %04x Revision %04x\n", chip_type, chip_rev); return -ENODEV; } rc = superio_enter(); if (rc) return rc; superio_select(GPIO); superio_outb(WDT_TOV1, WDTCFG); superio_outb(0x00, WDTCTRL); /* First try to get Gameport support */ if (try_gameport) { superio_select(GAMEPORT); base = superio_inw(BASEREG); if (!base) { base = GP_BASE_DEFAULT; superio_outw(base, BASEREG); } gpact = superio_inb(ACTREG); superio_outb(0x01, ACTREG); if (request_region(base, 1, WATCHDOG_NAME)) set_bit(WDTS_USE_GP, &wdt_status); else gp_rreq_fail = 1; } /* If we haven't Gameport support, try to get CIR support */ if (!nocir && !test_bit(WDTS_USE_GP, &wdt_status)) { if (!request_region(CIR_BASE, 8, WATCHDOG_NAME)) { if (gp_rreq_fail) pr_err("I/O Address 0x%04x and 0x%04x already in use\n", base, CIR_BASE); else pr_err("I/O Address 0x%04x already in use\n", CIR_BASE); rc = -EIO; goto err_out; } base = CIR_BASE; superio_select(CIR); superio_outw(base, BASEREG); superio_outb(0x00, CIR_ILS); ciract = superio_inb(ACTREG); superio_outb(0x01, ACTREG); if (gp_rreq_fail) { superio_select(GAMEPORT); superio_outb(gpact, ACTREG); } set_bit(WDTS_USE_CIR, &wdt_status); } if (timeout < 1 || timeout > max_units * 60) { timeout = DEFAULT_TIMEOUT; pr_warn("Timeout value out of range, use default %d sec\n", DEFAULT_TIMEOUT); } if (timeout > max_units) timeout = wdt_round_time(timeout); rc = register_reboot_notifier(&wdt_notifier); if (rc) { pr_err("Cannot register reboot notifier (err=%d)\n", rc); goto err_out_region; } rc = misc_register(&wdt_miscdev); if (rc) { pr_err("Cannot register miscdev on minor=%d (err=%d)\n", wdt_miscdev.minor, rc); goto err_out_reboot; } /* Initialize CIR to use it as keepalive source */ if (test_bit(WDTS_USE_CIR, &wdt_status)) { outb(0x00, CIR_RCR(base)); outb(0xc0, CIR_TCR1(base)); outb(0x5c, CIR_TCR2(base)); outb(0x10, CIR_IER(base)); outb(0x00, CIR_BDHR(base)); outb(0x01, CIR_BDLR(base)); outb(0x09, CIR_IER(base)); } pr_info("Chip IT%04x revision %d initialized. timeout=%d sec (nowayout=%d testmode=%d exclusive=%d nogameport=%d nocir=%d)\n", chip_type, chip_rev, timeout, nowayout, testmode, exclusive, nogameport, nocir); superio_exit(); return 0; err_out_reboot: unregister_reboot_notifier(&wdt_notifier); err_out_region: if (test_bit(WDTS_USE_GP, &wdt_status)) release_region(base, 1); else if (test_bit(WDTS_USE_CIR, &wdt_status)) { release_region(base, 8); superio_select(CIR); superio_outb(ciract, ACTREG); } err_out: if (try_gameport) { superio_select(GAMEPORT); superio_outb(gpact, ACTREG); } superio_exit(); return rc; }

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Ondrej Zajicek6910.04%220.00%
Joe Perches395.68%110.00%
Marc van der Wal314.51%110.00%
Nat Gurumoorthy304.37%110.00%
Paolo Teti30.44%110.00%
Huaro Tomita30.44%110.00%
Maciej S. Szmigiero30.44%110.00%
Diego Elio 'Flameeyes' Pettenò30.44%110.00%
Total687100.00%10100.00%


static void __exit it87_wdt_exit(void) { if (superio_enter() == 0) { superio_select(GPIO); superio_outb(0x00, WDTCTRL); superio_outb(0x00, WDTCFG); superio_outb(0x00, WDTVALLSB); if (max_units > 255) superio_outb(0x00, WDTVALMSB); if (test_bit(WDTS_USE_GP, &wdt_status)) { superio_select(GAMEPORT); superio_outb(gpact, ACTREG); } else if (test_bit(WDTS_USE_CIR, &wdt_status)) { superio_select(CIR); superio_outb(ciract, ACTREG); } superio_exit(); } misc_deregister(&wdt_miscdev); unregister_reboot_notifier(&wdt_notifier); if (test_bit(WDTS_USE_GP, &wdt_status)) release_region(base, 1); else if (test_bit(WDTS_USE_CIR, &wdt_status)) release_region(base, 8); }

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Oliver Schuster10869.23%125.00%
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Ondrej Zajicek85.13%125.00%
Nat Gurumoorthy74.49%125.00%
Total156100.00%4100.00%

module_init(it87_wdt_init); module_exit(it87_wdt_exit); MODULE_AUTHOR("Oliver Schuster"); MODULE_DESCRIPTION("Hardware Watchdog Device Driver for IT87xx EC-LPC I/O"); MODULE_LICENSE("GPL");

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Oliver Schuster224177.09%18.33%
Nat Gurumoorthy2207.57%18.33%
Ondrej Zajicek2117.26%216.67%
Marc van der Wal1404.82%18.33%
Joe Perches481.65%18.33%
Huaro Tomita210.72%18.33%
Maciej S. Szmigiero80.28%18.33%
Diego Elio 'Flameeyes' Pettenò80.28%18.33%
Paolo Teti70.24%18.33%
Wim Van Sebroeck30.10%216.67%
Total2907100.00%12100.00%
Directory: drivers/watchdog
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