[WATCHDOG] New SBC8360 watchdog driver (revised) (3809ad38) · Commits · e / devices / android_kernel_teracube_mt6765

drivers/char/watchdog/Kconfig

+13 −0

Original line number	Diff line number	Diff line
		@@ -309,6 +309,19 @@ config 60XX_WDT
		You can compile this driver directly into the kernel, or use
		it as a module. The module will be called sbc60xxwdt.

		config SBC8360_WDT
		tristate "SBC8360 Watchdog Timer"
		depends on WATCHDOG && X86
		---help---

		This is the driver for the hardware watchdog on the SBC8360 Single
		Board Computer produced by Axiomtek Co., Ltd. (www.axiomtek.com).

		To compile this driver as a module, choose M here: the
		module will be called sbc8360.ko.

		Most people will say N.

		config CPU5_WDT
		tristate "SMA CPU5 Watchdog"
		depends on WATCHDOG && X86

drivers/char/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,7 @@ obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
		obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
		obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
		obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
		obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
		obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
		obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
		obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o

drivers/char/watchdog/sbc8360.c

0 → 100644

+419 −0

Original line number	Diff line number	Diff line
		/*
		* SBC8360 Watchdog driver
		*
		* (c) Copyright 2005 Webcon, Inc.
		*
		* Based on ib700wdt.c, which is based on advantechwdt.c which is based
		* on acquirewdt.c which is based on wdt.c.
		*
		* (c) Copyright 2001 Charles Howes <chowes@vsol.net>
		*
		* Based on advantechwdt.c which is based on acquirewdt.c which
		* is based on wdt.c.
		*
		* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
		*
		* Based on acquirewdt.c which is based on wdt.c.
		* Original copyright messages:
		*
		* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
		* http://www.redhat.com
		*
		* 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 <alan@redhat.com>
		*
		* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
		* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
		* Added timeout module option to override default
		*
		*/

		#include <linux/config.h>
		#include <linux/module.h>
		#include <linux/types.h>
		#include <linux/miscdevice.h>
		#include <linux/watchdog.h>
		#include <linux/ioport.h>
		#include <linux/delay.h>
		#include <linux/notifier.h>
		#include <linux/fs.h>
		#include <linux/reboot.h>
		#include <linux/init.h>
		#include <linux/spinlock.h>
		#include <linux/moduleparam.h>

		#include <asm/io.h>
		#include <asm/uaccess.h>
		#include <asm/system.h>

		static unsigned long sbc8360_is_open;
		static spinlock_t sbc8360_lock;
		static char expect_close;

		#define PFX "sbc8360: "

		/*
		*
		* Watchdog Timer Configuration
		*
		* The function of the watchdog timer is to reset the system automatically
		* and is defined at I/O port 0120H and 0121H. To enable the watchdog timer
		* and allow the system to reset, write appropriate values from the table
		* below to I/O port 0120H and 0121H. To disable the timer, write a zero
		* value to I/O port 0121H for the system to stop the watchdog function.
		*
		* The following describes how the timer should be programmed (according to
		* the vendor documentation)
		*
		* Enabling Watchdog:
		* MOV AX,000AH (enable, phase I)
		* MOV DX,0120H
		* OUT DX,AX
		* MOV AX,000BH (enable, phase II)
		* MOV DX,0120H
		* OUT DX,AX
		* MOV AX,000nH (set multiplier n, from 1-4)
		* MOV DX,0120H
		* OUT DX,AX
		* MOV AX,000mH (set base timer m, from 0-F)
		* MOV DX,0121H
		* OUT DX,AX
		*
		* Reset timer:
		* MOV AX,000mH (same as set base timer, above)
		* MOV DX,0121H
		* OUT DX,AX
		*
		* Disabling Watchdog:
		* MOV AX,0000H (a zero value)
		* MOV DX,0120H
		* OUT DX,AX
		*
		* Watchdog timeout configuration values:
		* N
		* M \| 1 2 3 4
		* --\|----------------------------------
		* 0 \| 0.5s 5s 50s 100s
		* 1 \| 1s 10s 100s 200s
		* 2 \| 1.5s 15s 150s 300s
		* 3 \| 2s 20s 200s 400s
		* 4 \| 2.5s 25s 250s 500s
		* 5 \| 3s 30s 300s 600s
		* 6 \| 3.5s 35s 350s 700s
		* 7 \| 4s 40s 400s 800s
		* 8 \| 4.5s 45s 450s 900s
		* 9 \| 5s 50s 500s 1000s
		* A \| 5.5s 55s 550s 1100s
		* B \| 6s 60s 600s 1200s
		* C \| 6.5s 65s 650s 1300s
		* D \| 7s 70s 700s 1400s
		* E \| 7.5s 75s 750s 1500s
		* F \| 8s 80s 800s 1600s
		*
		* Another way to say the same things is:
		* For N=1, Timeout = (M+1) * 0.5s
		* For N=2, Timeout = (M+1) * 5s
		* For N=3, Timeout = (M+1) * 50s
		* For N=4, Timeout = (M+1) * 100s
		*
		*/

		static int wd_times[64][2] = {
		{0, 1}, /* 0 = 0.5s */
		{1, 1}, /* 1 = 1s */
		{2, 1}, /* 2 = 1.5s */
		{3, 1}, /* 3 = 2s */
		{4, 1}, /* 4 = 2.5s */
		{5, 1}, /* 5 = 3s */
		{6, 1}, /* 6 = 3.5s */
		{7, 1}, /* 7 = 4s */
		{8, 1}, /* 8 = 4.5s */
		{9, 1}, /* 9 = 5s */
		{0xA, 1}, /* 10 = 5.5s */
		{0xB, 1}, /* 11 = 6s */
		{0xC, 1}, /* 12 = 6.5s */
		{0xD, 1}, /* 13 = 7s */
		{0xE, 1}, /* 14 = 7.5s */
		{0xF, 1}, /* 15 = 8s */
		{0, 2}, /* 16 = 5s */
		{1, 2}, /* 17 = 10s */
		{2, 2}, /* 18 = 15s */
		{3, 2}, /* 19 = 20s */
		{4, 2}, /* 20 = 25s */
		{5, 2}, /* 21 = 30s */
		{6, 2}, /* 22 = 35s */
		{7, 2}, /* 23 = 40s */
		{8, 2}, /* 24 = 45s */
		{9, 2}, /* 25 = 50s */
		{0xA, 2}, /* 26 = 55s */
		{0xB, 2}, /* 27 = 60s */
		{0xC, 2}, /* 28 = 65s */
		{0xD, 2}, /* 29 = 70s */
		{0xE, 2}, /* 30 = 75s */
		{0xF, 2}, /* 31 = 80s */
		{0, 3}, /* 32 = 50s */
		{1, 3}, /* 33 = 100s */
		{2, 3}, /* 34 = 150s */
		{3, 3}, /* 35 = 200s */
		{4, 3}, /* 36 = 250s */
		{5, 3}, /* 37 = 300s */
		{6, 3}, /* 38 = 350s */
		{7, 3}, /* 39 = 400s */
		{8, 3}, /* 40 = 450s */
		{9, 3}, /* 41 = 500s */
		{0xA, 3}, /* 42 = 550s */
		{0xB, 3}, /* 43 = 600s */
		{0xC, 3}, /* 44 = 650s */
		{0xD, 3}, /* 45 = 700s */
		{0xE, 3}, /* 46 = 750s */
		{0xF, 3}, /* 47 = 800s */
		{0, 4}, /* 48 = 100s */
		{1, 4}, /* 49 = 200s */
		{2, 4}, /* 50 = 300s */
		{3, 4}, /* 51 = 400s */
		{4, 4}, /* 52 = 500s */
		{5, 4}, /* 53 = 600s */
		{6, 4}, /* 54 = 700s */
		{7, 4}, /* 55 = 800s */
		{8, 4}, /* 56 = 900s */
		{9, 4}, /* 57 = 1000s */
		{0xA, 4}, /* 58 = 1100s */
		{0xB, 4}, /* 59 = 1200s */
		{0xC, 4}, /* 60 = 1300s */
		{0xD, 4}, /* 61 = 1400s */
		{0xE, 4}, /* 62 = 1500s */
		{0xF, 4} /* 63 = 1600s */
		};

		#define SBC8360_ENABLE 0x120
		#define SBC8360_BASETIME 0x121

		static int timeout = 27;
		static int wd_margin = 0xB;
		static int wd_multiplier = 2;

		#ifdef CONFIG_WATCHDOG_NOWAYOUT
		static int nowayout = 1;
		#else
		static int nowayout = 0;
		#endif

		module_param(timeout, int, 27);
		MODULE_PARM_DESC(timeout, "Index into timeout table (0-63) (default=27 (60s))");
		module_param(nowayout, int, 0);
		MODULE_PARM_DESC(nowayout,
		"Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");

		/*
		* Kernel methods.
		*/

		/* Activate and pre-configure watchdog */
		static void sbc8360_activate(void)
		{
		/* Enable the watchdog */
		outb(0x0A, SBC8360_ENABLE);
		msleep_interruptible(100);
		outb(0x0B, SBC8360_ENABLE);
		msleep_interruptible(100);
		/* Set timeout multiplier */
		outb(wd_multiplier, SBC8360_ENABLE);
		msleep_interruptible(100);
		/* Nothing happens until first sbc8360_ping() */
		}

		/* Kernel pings watchdog */
		static void sbc8360_ping(void)
		{
		/* Write the base timer register */
		outb(wd_margin, SBC8360_BASETIME);
		}

		/* Userspace pings kernel driver, or requests clean close */
		static ssize_t sbc8360_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;
		}
		}
		sbc8360_ping();
		}
		return count;
		}

		static int sbc8360_open(struct inode inode, struct file file)
		{
		spin_lock(&sbc8360_lock);
		if (test_and_set_bit(0, &sbc8360_is_open)) {
		spin_unlock(&sbc8360_lock);
		return -EBUSY;
		}
		if (nowayout)
		__module_get(THIS_MODULE);

		/* Activate and ping once to start the countdown */
		spin_unlock(&sbc8360_lock);
		sbc8360_activate();
		sbc8360_ping();
		return nonseekable_open(inode, file);
		}

		static int sbc8360_close(struct inode inode, struct file file)
		{
		spin_lock(&sbc8360_lock);
		if (expect_close == 42)
		outb(0, SBC8360_ENABLE);
		else
		printk(KERN_CRIT PFX
		"SBC8360 device closed unexpectedly. SBC8360 will not stop!\n");

		clear_bit(0, &sbc8360_is_open);
		expect_close = 0;
		spin_unlock(&sbc8360_lock);
		return 0;
		}

		/*
		* Notifier for system down
		*/

		static int sbc8360_notify_sys(struct notifier_block *this, unsigned long code,
		void *unused)
		{
		if (code == SYS_DOWN \|\| code == SYS_HALT) {
		/* Disable the SBC8360 Watchdog */
		outb(0, SBC8360_ENABLE);
		}
		return NOTIFY_DONE;
		}

		/*
		* Kernel Interfaces
		*/

		static struct file_operations sbc8360_fops = {
		.owner = THIS_MODULE,
		.llseek = no_llseek,
		.write = sbc8360_write,
		.open = sbc8360_open,
		.release = sbc8360_close,
		};

		static struct miscdevice sbc8360_miscdev = {
		.minor = WATCHDOG_MINOR,
		.name = "watchdog",
		.fops = &sbc8360_fops,
		};

		/*
		* The SBC8360 needs to learn about soft shutdowns in order to
		* turn the timebomb registers off.
		*/

		static struct notifier_block sbc8360_notifier = {
		.notifier_call = sbc8360_notify_sys,
		};

		static int __init sbc8360_init(void)
		{
		int res;
		unsigned long int mseconds = 60000;

		spin_lock_init(&sbc8360_lock);
		res = misc_register(&sbc8360_miscdev);
		if (res) {
		printk(KERN_ERR PFX "failed to register misc device\n");
		goto out_nomisc;
		}

		if (!request_region(SBC8360_ENABLE, 1, "SBC8360")) {
		printk(KERN_ERR PFX "ENABLE method I/O %X is not available.\n",
		SBC8360_ENABLE);
		res = -EIO;
		goto out_noenablereg;
		}
		if (!request_region(SBC8360_BASETIME, 1, "SBC8360")) {
		printk(KERN_ERR PFX
		"BASETIME method I/O %X is not available.\n",
		SBC8360_BASETIME);
		res = -EIO;
		goto out_nobasetimereg;
		}

		res = register_reboot_notifier(&sbc8360_notifier);
		if (res) {
		printk(KERN_ERR PFX "Failed to register reboot notifier.\n");
		goto out_noreboot;
		}

		if (timeout < 0 \|\| timeout > 63) {
		printk(KERN_ERR PFX "Invalid timeout index (must be 0-63).\n");
		res = -EINVAL;
		goto out_noreboot;
		}

		wd_margin = wd_times[timeout][0];
		wd_multiplier = wd_times[timeout][1];

		if (wd_multiplier == 1)
		mseconds = (wd_margin + 1) * 500;
		else if (wd_multiplier == 2)
		mseconds = (wd_margin + 1) * 5000;
		else if (wd_multiplier == 3)
		mseconds = (wd_margin + 1) * 50000;
		else if (wd_multiplier == 4)
		mseconds = (wd_margin + 1) * 100000;

		/* My kingdom for the ability to print "0.5 seconds" in the kernel! */
		printk(KERN_INFO PFX "Timeout set at %ld ms.\n", mseconds);

		return 0;

		out_noreboot:
		release_region(SBC8360_ENABLE, 1);
		release_region(SBC8360_BASETIME, 1);
		out_noenablereg:
		out_nobasetimereg:
		misc_deregister(&sbc8360_miscdev);
		out_nomisc:
		return res;
		}

		static void __exit sbc8360_exit(void)
		{
		misc_deregister(&sbc8360_miscdev);
		unregister_reboot_notifier(&sbc8360_notifier);
		release_region(SBC8360_ENABLE, 1);
		release_region(SBC8360_BASETIME, 1);
		}

		module_init(sbc8360_init);
		module_exit(sbc8360_exit);

		MODULE_AUTHOR("Ian E. Morgan <imorgan@webcon.ca>");
		MODULE_DESCRIPTION("SBC8360 watchdog driver");
		MODULE_LICENSE("GPL");
		MODULE_VERSION("1.0");
		MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

		/* end of sbc8360.c */