[net-next-2.6.git] / drivers / watchdog / sch311x_wdt.c

/*
 *	sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
 *			integrated watchdog.
 *
 *	(c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
 *
 *	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 Wim Van Sebroeck nor Iguana vzw. admit liability nor
 *	provide warranty for any of this software. This material is
 *	provided "AS-IS" and at no charge.
 */

/*
 *	Includes, defines, variables, module parameters, ...
 */

/* Includes */
#include <linux/module.h>		/* For module specific items */
#include <linux/moduleparam.h>		/* For new moduleparam's */
#include <linux/types.h>		/* For standard types (like size_t) */
#include <linux/errno.h>		/* For the -ENODEV/... values */
#include <linux/kernel.h>		/* For printk/... */
#include <linux/miscdevice.h>		/* For MODULE_ALIAS_MISCDEV
							(WATCHDOG_MINOR) */
#include <linux/watchdog.h>		/* For the watchdog specific items */
#include <linux/init.h>			/* For __init/__exit/... */
#include <linux/fs.h>			/* For file operations */
#include <linux/platform_device.h>	/* For platform_driver framework */
#include <linux/ioport.h>		/* For io-port access */
#include <linux/spinlock.h>		/* For spin_lock/spin_unlock/... */
#include <linux/uaccess.h>		/* For copy_to_user/put_user/... */
#include <linux/io.h>			/* For inb/outb/... */

/* Module and version information */
#define DRV_NAME	"sch311x_wdt"
#define PFX		DRV_NAME ": "

/* Runtime registers */
#define RESGEN			0x1d
#define GP60			0x47
#define WDT_TIME_OUT		0x65
#define WDT_VAL			0x66
#define WDT_CFG			0x67
#define WDT_CTRL		0x68

/* internal variables */
static unsigned long sch311x_wdt_is_open;
static char sch311x_wdt_expect_close;
static struct platform_device *sch311x_wdt_pdev;

static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };

static struct {	/* The devices private data */
	/* the Runtime Register base address */
	unsigned short runtime_reg;
	/* The card's boot status */
	int boot_status;
	/* the lock for io operations */
	spinlock_t io_lock;
} sch311x_wdt_data;

/* Module load parameters */
static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static unsigned short therm_trip;
module_param(therm_trip, ushort, 0);
MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator");

#define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
static int timeout = WATCHDOG_TIMEOUT;	/* in seconds */
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
	"Watchdog timeout in seconds. 1<= timeout <=15300, default="
		__MODULE_STRING(WATCHDOG_TIMEOUT) ".");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout,
	"Watchdog cannot be stopped once started (default="
		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
 *	Super-IO functions
 */

static inline void sch311x_sio_enter(int sio_config_port)
{
	outb(0x55, sio_config_port);
}

static inline void sch311x_sio_exit(int sio_config_port)
{
	outb(0xaa, sio_config_port);
}

static inline int sch311x_sio_inb(int sio_config_port, int reg)
{
	outb(reg, sio_config_port);
	return inb(sio_config_port + 1);
}

static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
{
	outb(reg, sio_config_port);
	outb(val, sio_config_port + 1);
}

/*
 *	Watchdog Operations
 */

static void sch311x_wdt_set_timeout(int t)
{
	unsigned char timeout_unit = 0x80;

	/* When new timeout is bigger then 255 seconds, we will use minutes */
	if (t > 255) {
		timeout_unit = 0;
		t /= 60;
	}

	/* -- Watchdog Timeout --
	 * Bit 0-6 (Reserved)
	 * Bit 7   WDT Time-out Value Units Select
	 *         (0 = Minutes, 1 = Seconds)
	 */
	outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);

	/* -- Watchdog Timer Time-out Value --
	 * Bit 0-7 Binary coded units (0=Disabled, 1..255)
	 */
	outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
}

static void sch311x_wdt_start(void)
{
	spin_lock(&sch311x_wdt_data.io_lock);

	/* set watchdog's timeout */
	sch311x_wdt_set_timeout(timeout);
	/* enable the watchdog */
	/* -- General Purpose I/O Bit 6.0 --
	 * Bit 0,   In/Out: 0 = Output, 1 = Input
	 * Bit 1,   Polarity: 0 = No Invert, 1 = Invert
	 * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
	 *                           10 = Either Edge Triggered Intr.4
	 * Bit 4-6  (Reserved)
	 * Bit 7,   Output Type: 0 = Push Pull Bit, 1 = Open Drain
	 */
	outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);

	spin_unlock(&sch311x_wdt_data.io_lock);

}

static void sch311x_wdt_stop(void)
{
	spin_lock(&sch311x_wdt_data.io_lock);

	/* stop the watchdog */
	outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
	/* disable timeout by setting it to 0 */
	sch311x_wdt_set_timeout(0);

	spin_unlock(&sch311x_wdt_data.io_lock);
}

static void sch311x_wdt_keepalive(void)
{
	spin_lock(&sch311x_wdt_data.io_lock);
	sch311x_wdt_set_timeout(timeout);
	spin_unlock(&sch311x_wdt_data.io_lock);
}

static int sch311x_wdt_set_heartbeat(int t)
{
	if (t < 1 || t > (255*60))
		return -EINVAL;

	/* When new timeout is bigger then 255 seconds,
	 * we will round up to minutes (with a max of 255) */
	if (t > 255)
		t = (((t - 1) / 60) + 1) * 60;

	timeout = t;
	return 0;
}

static void sch311x_wdt_get_status(int *status)
{
	unsigned char new_status;

	*status = 0;

	spin_lock(&sch311x_wdt_data.io_lock);

	/* -- Watchdog timer control --
	 * Bit 0   Status Bit: 0 = Timer counting, 1 = Timeout occured
	 * Bit 1   Reserved
	 * Bit 2   Force Timeout: 1 = Forces WD timeout event (self-cleaning)
	 * Bit 3   P20 Force Timeout enabled:
	 *          0 = P20 activity does not generate the WD timeout event
	 *          1 = P20 Allows rising edge of P20, from the keyboard
	 *              controller, to force the WD timeout event.
	 * Bit 4-7 Reserved
	 */
	new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
	if (new_status & 0x01)
		*status |= WDIOF_CARDRESET;

	spin_unlock(&sch311x_wdt_data.io_lock);
}

/*
 *	/dev/watchdog handling
 */

static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf,
						size_t count, loff_t *ppos)
{
	if (count) {
		if (!nowayout) {
			size_t i;

			sch311x_wdt_expect_close = 0;

			for (i = 0; i != count; i++) {
				char c;
				if (get_user(c, buf + i))
					return -EFAULT;
				if (c == 'V')
					sch311x_wdt_expect_close = 42;
			}
		}
		sch311x_wdt_keepalive();
	}
	return count;
}

static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	int status;
	int new_timeout;
	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		= DRV_NAME,
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		break;

	case WDIOC_GETSTATUS:
	{
		sch311x_wdt_get_status(&status);
		return put_user(status, p);
	}
	case WDIOC_GETBOOTSTATUS:
		return put_user(sch311x_wdt_data.boot_status, p);

	case WDIOC_SETOPTIONS:
	{
		int options, retval = -EINVAL;

		if (get_user(options, p))
			return -EFAULT;
		if (options & WDIOS_DISABLECARD) {
			sch311x_wdt_stop();
			retval = 0;
		}
		if (options & WDIOS_ENABLECARD) {
			sch311x_wdt_start();
			retval = 0;
		}
		return retval;
	}
	case WDIOC_KEEPALIVE:
		sch311x_wdt_keepalive();
		break;

	case WDIOC_SETTIMEOUT:
		if (get_user(new_timeout, p))
			return -EFAULT;
		if (sch311x_wdt_set_heartbeat(new_timeout))
			return -EINVAL;
		sch311x_wdt_keepalive();
		/* Fall */
	case WDIOC_GETTIMEOUT:
		return put_user(timeout, p);
	default:
		return -ENOTTY;
	}
	return 0;
}

static int sch311x_wdt_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &sch311x_wdt_is_open))
		return -EBUSY;
	/*
	 *	Activate
	 */
	sch311x_wdt_start();
	return nonseekable_open(inode, file);
}

static int sch311x_wdt_close(struct inode *inode, struct file *file)
{
	if (sch311x_wdt_expect_close == 42) {
		sch311x_wdt_stop();
	} else {
		printk(KERN_CRIT PFX
				"Unexpected close, not stopping watchdog!\n");
		sch311x_wdt_keepalive();
	}
	clear_bit(0, &sch311x_wdt_is_open);
	sch311x_wdt_expect_close = 0;
	return 0;
}

/*
 *	Kernel Interfaces
 */

static const struct file_operations sch311x_wdt_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= sch311x_wdt_write,
	.unlocked_ioctl	= sch311x_wdt_ioctl,
	.open		= sch311x_wdt_open,
	.release	= sch311x_wdt_close,
};

static struct miscdevice sch311x_wdt_miscdev = {
	.minor	= WATCHDOG_MINOR,
	.name	= "watchdog",
	.fops	= &sch311x_wdt_fops,
};

/*
 *	Init & exit routines
 */

static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	unsigned char val;
	int err;

	spin_lock_init(&sch311x_wdt_data.io_lock);

	if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1,
								DRV_NAME)) {
		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
			sch311x_wdt_data.runtime_reg + RESGEN,
			sch311x_wdt_data.runtime_reg + RESGEN);
		err = -EBUSY;
		goto exit;
	}

	if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
			sch311x_wdt_data.runtime_reg + GP60,
			sch311x_wdt_data.runtime_reg + GP60);
		err = -EBUSY;
		goto exit_release_region;
	}

	if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
								DRV_NAME)) {
		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
			sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
			sch311x_wdt_data.runtime_reg + WDT_CTRL);
		err = -EBUSY;
		goto exit_release_region2;
	}

	/* Make sure that the watchdog is not running */
	sch311x_wdt_stop();

	/* Disable keyboard and mouse interaction and interrupt */
	/* -- Watchdog timer configuration --
	 * Bit 0   Reserved
	 * Bit 1   Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
	 * Bit 2   Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
	 * Bit 3   Reserved
	 * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
	 *            0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
	 */
	outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);

	/* Check that the heartbeat value is within it's range ;
	 * if not reset to the default */
	if (sch311x_wdt_set_heartbeat(timeout)) {
		sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
		dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
			timeout);
	}

	/* Get status at boot */
	sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);

	/* enable watchdog */
	/* -- Reset Generator --
	 * Bit 0   Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled
	 * Bit 1   Thermtrip Source Select: O* = No Source, 1 = Source
	 * Bit 2   WDT2_CTL: WDT input bit
	 * Bit 3-7 Reserved
	 */
	outb(0, sch311x_wdt_data.runtime_reg + RESGEN);
	val = therm_trip ? 0x06 : 0x04;
	outb(val, sch311x_wdt_data.runtime_reg + RESGEN);

	sch311x_wdt_miscdev.parent = dev;

	err = misc_register(&sch311x_wdt_miscdev);
	if (err != 0) {
		dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
							WATCHDOG_MINOR, err);
		goto exit_release_region3;
	}

	dev_info(dev,
		"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
		timeout, nowayout);

	return 0;

exit_release_region3:
	release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
exit_release_region2:
	release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
exit_release_region:
	release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
	sch311x_wdt_data.runtime_reg = 0;
exit:
	return err;
}

static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
{
	/* Stop the timer before we leave */
	if (!nowayout)
		sch311x_wdt_stop();

	/* Deregister */
	misc_deregister(&sch311x_wdt_miscdev);
	release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
	release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
	release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
	sch311x_wdt_data.runtime_reg = 0;
	return 0;
}

static void sch311x_wdt_shutdown(struct platform_device *dev)
{
	/* Turn the WDT off if we have a soft shutdown */
	sch311x_wdt_stop();
}

#define sch311x_wdt_suspend NULL
#define sch311x_wdt_resume  NULL

static struct platform_driver sch311x_wdt_driver = {
	.probe		= sch311x_wdt_probe,
	.remove		= __devexit_p(sch311x_wdt_remove),
	.shutdown	= sch311x_wdt_shutdown,
	.suspend	= sch311x_wdt_suspend,
	.resume		= sch311x_wdt_resume,
	.driver		= {
		.owner = THIS_MODULE,
		.name = DRV_NAME,
	},
};

static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
{
	int err = 0, reg;
	unsigned short base_addr;
	unsigned char dev_id;

	sch311x_sio_enter(sio_config_port);

	/* Check device ID. We currently know about:
	 * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
	reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
	if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
		err = -ENODEV;
		goto exit;
	}
	dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;

	/* Select logical device A (runtime registers) */
	sch311x_sio_outb(sio_config_port, 0x07, 0x0a);

	/* Check if Logical Device Register is currently active */
	if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0)
		printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n");

	/* Get the base address of the runtime registers */
	base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
			   sch311x_sio_inb(sio_config_port, 0x61);
	if (!base_addr) {
		printk(KERN_ERR PFX "Base address not set.\n");
		err = -ENODEV;
		goto exit;
	}
	*addr = base_addr;

	printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n",
		dev_id, base_addr);

exit:
	sch311x_sio_exit(sio_config_port);
	return err;
}

static int __init sch311x_wdt_init(void)
{
	int err, i, found = 0;
	unsigned short addr = 0;

	for (i = 0; !found && sch311x_ioports[i]; i++)
		if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
			found++;

	if (!found)
		return -ENODEV;

	sch311x_wdt_data.runtime_reg = addr;

	err = platform_driver_register(&sch311x_wdt_driver);
	if (err)
		return err;

	sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
								NULL, 0);

	if (IS_ERR(sch311x_wdt_pdev)) {
		err = PTR_ERR(sch311x_wdt_pdev);
		goto unreg_platform_driver;
	}

	return 0;

unreg_platform_driver:
	platform_driver_unregister(&sch311x_wdt_driver);
	return err;
}

static void __exit sch311x_wdt_exit(void)
{
	platform_device_unregister(sch311x_wdt_pdev);
	platform_driver_unregister(&sch311x_wdt_driver);
}

module_init(sch311x_wdt_init);
module_exit(sch311x_wdt_exit);

MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
4c6e63bd WVS	1	/*
	2	* sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
	3	* integrated watchdog.
	4	*
	5	* (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*
	12	* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
	13	* provide warranty for any of this software. This material is
	14	* provided "AS-IS" and at no charge.
	15	*/
	16
	17	/*
	18	* Includes, defines, variables, module parameters, ...
	19	*/
	20
	21	/* Includes */
	22	#include <linux/module.h> /* For module specific items */
	23	#include <linux/moduleparam.h> /* For new moduleparam's */
	24	#include <linux/types.h> /* For standard types (like size_t) */
	25	#include <linux/errno.h> /* For the -ENODEV/... values */
	26	#include <linux/kernel.h> /* For printk/... */
	27	#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
	28	(WATCHDOG_MINOR) */
	29	#include <linux/watchdog.h> /* For the watchdog specific items */
	30	#include <linux/init.h> /* For __init/__exit/... */
	31	#include <linux/fs.h> /* For file operations */
	32	#include <linux/platform_device.h> /* For platform_driver framework */
	33	#include <linux/ioport.h> /* For io-port access */
	34	#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
	35	#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
	36	#include <linux/io.h> /* For inb/outb/... */
	37
	38	/* Module and version information */
	39	#define DRV_NAME "sch311x_wdt"
	40	#define PFX DRV_NAME ": "
	41
	42	/* Runtime registers */
	43	#define RESGEN 0x1d
	44	#define GP60 0x47
	45	#define WDT_TIME_OUT 0x65
	46	#define WDT_VAL 0x66
	47	#define WDT_CFG 0x67
	48	#define WDT_CTRL 0x68
	49
	50	/* internal variables */
	51	static unsigned long sch311x_wdt_is_open;
	52	static char sch311x_wdt_expect_close;
	53	static struct platform_device *sch311x_wdt_pdev;
	54
	55	static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
	56
	57	static struct { /* The devices private data */
	58	/* the Runtime Register base address */
	59	unsigned short runtime_reg;
	60	/* The card's boot status */
	61	int boot_status;
	62	/* the lock for io operations */
	63	spinlock_t io_lock;
	64	} sch311x_wdt_data;
65
66	/* Module load parameters */
67	static unsigned short force_id;
68	module_param(force_id, ushort, 0);
69	MODULE_PARM_DESC(force_id, "Override the detected device ID");
70
71	static unsigned short therm_trip;
72	module_param(therm_trip, ushort, 0);
73	MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator");
74
75	#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
76	static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
77	module_param(timeout, int, 0);
78	MODULE_PARM_DESC(timeout,
79	"Watchdog timeout in seconds. 1<= timeout <=15300, default="
80	__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
81
82	static int nowayout = WATCHDOG_NOWAYOUT;
83	module_param(nowayout, int, 0);
84	MODULE_PARM_DESC(nowayout,
85	"Watchdog cannot be stopped once started (default="
86	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
87
88	/*
89	* Super-IO functions
90	*/
91
92	static inline void sch311x_sio_enter(int sio_config_port)
93	{
94	outb(0x55, sio_config_port);
95	}
96
97	static inline void sch311x_sio_exit(int sio_config_port)
98	{
99	outb(0xaa, sio_config_port);
100	}
101
102	static inline int sch311x_sio_inb(int sio_config_port, int reg)
103	{
104	outb(reg, sio_config_port);
105	return inb(sio_config_port + 1);
106	}
107
108	static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
109	{
110	outb(reg, sio_config_port);
111	outb(val, sio_config_port + 1);
112	}
113
114	/*
115	* Watchdog Operations
116	*/
117
118	static void sch311x_wdt_set_timeout(int t)
119	{
120	unsigned char timeout_unit = 0x80;
121
122	/* When new timeout is bigger then 255 seconds, we will use minutes */
123	if (t > 255) {
124	timeout_unit = 0;
125	t /= 60;
126	}
127
128	/* -- Watchdog Timeout --
129	* Bit 0-6 (Reserved)
130	* Bit 7 WDT Time-out Value Units Select
131	* (0 = Minutes, 1 = Seconds)
132	*/
133	outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
134
135	/* -- Watchdog Timer Time-out Value --
136	* Bit 0-7 Binary coded units (0=Disabled, 1..255)
137	*/
138	outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
139	}
140
141	static void sch311x_wdt_start(void)
142	{
143	spin_lock(&sch311x_wdt_data.io_lock);
144
145	/* set watchdog's timeout */
146	sch311x_wdt_set_timeout(timeout);
147	/* enable the watchdog */
148	/* -- General Purpose I/O Bit 6.0 --
149	* Bit 0, In/Out: 0 = Output, 1 = Input
150	* Bit 1, Polarity: 0 = No Invert, 1 = Invert
151	* Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
152	* 10 = Either Edge Triggered Intr.4
153	* Bit 4-6 (Reserved)
154	* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
155	*/
156	outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
157
158	spin_unlock(&sch311x_wdt_data.io_lock);
159
160	}
161
162	static void sch311x_wdt_stop(void)
163	{
164	spin_lock(&sch311x_wdt_data.io_lock);
165
166	/* stop the watchdog */
167	outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
168	/* disable timeout by setting it to 0 */
169	sch311x_wdt_set_timeout(0);
170
171	spin_unlock(&sch311x_wdt_data.io_lock);
172	}
173
174	static void sch311x_wdt_keepalive(void)
175	{
176	spin_lock(&sch311x_wdt_data.io_lock);
177	sch311x_wdt_set_timeout(timeout);
178	spin_unlock(&sch311x_wdt_data.io_lock);
179	}
180
181	static int sch311x_wdt_set_heartbeat(int t)
182	{
183	if (t < 1 \|\| t > (255*60))
184	return -EINVAL;
185
186	/* When new timeout is bigger then 255 seconds,
187	* we will round up to minutes (with a max of 255) */
188	if (t > 255)
189	t = (((t - 1) / 60) + 1) * 60;
190
191	timeout = t;
192	return 0;
193	}
194
195	static void sch311x_wdt_get_status(int *status)
196	{
197	unsigned char new_status;
198
199	*status = 0;
200
201	spin_lock(&sch311x_wdt_data.io_lock);
202
203	/* -- Watchdog timer control --
204	* Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occured
205	* Bit 1 Reserved
206	* Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
207	* Bit 3 P20 Force Timeout enabled:
208	* 0 = P20 activity does not generate the WD timeout event
209	* 1 = P20 Allows rising edge of P20, from the keyboard
210	* controller, to force the WD timeout event.
211	* Bit 4-7 Reserved
212	*/
213	new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
214	if (new_status & 0x01)
215	*status \|= WDIOF_CARDRESET;
216
217	spin_unlock(&sch311x_wdt_data.io_lock);
218	}
219
220	/*
221	* /dev/watchdog handling
222	*/
223
224	static ssize_t sch311x_wdt_write(struct file file, const char __user buf,
225	size_t count, loff_t *ppos)
226	{
227	if (count) {
228	if (!nowayout) {
229	size_t i;
230
231	sch311x_wdt_expect_close = 0;
232
233	for (i = 0; i != count; i++) {
234	char c;
235	if (get_user(c, buf + i))
236	return -EFAULT;
237	if (c == 'V')
238	sch311x_wdt_expect_close = 42;
239	}
240	}
241	sch311x_wdt_keepalive();
242	}
243	return count;
244	}
245
246	static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
247	unsigned long arg)
248	{
249	int status;
250	int new_timeout;
251	void __user argp = (void __user )arg;
252	int __user *p = argp;
42747d71	253	static const struct watchdog_info ident = {
4c6e63bd WVS	254	.options = WDIOF_KEEPALIVEPING \|
	255	WDIOF_SETTIMEOUT \|
	256	WDIOF_MAGICCLOSE,
	257	.firmware_version = 1,
	258	.identity = DRV_NAME,
	259	};
	260
	261	switch (cmd) {
	262	case WDIOC_GETSUPPORT:
	263	if (copy_to_user(argp, &ident, sizeof(ident)))
	264	return -EFAULT;
	265	break;
	266
	267	case WDIOC_GETSTATUS:
	268	{
	269	sch311x_wdt_get_status(&status);
	270	return put_user(status, p);
	271	}
	272	case WDIOC_GETBOOTSTATUS:
	273	return put_user(sch311x_wdt_data.boot_status, p);
	274
	275	case WDIOC_SETOPTIONS:
	276	{
	277	int options, retval = -EINVAL;
	278
	279	if (get_user(options, p))
	280	return -EFAULT;
	281	if (options & WDIOS_DISABLECARD) {
	282	sch311x_wdt_stop();
	283	retval = 0;
	284	}
	285	if (options & WDIOS_ENABLECARD) {
	286	sch311x_wdt_start();
	287	retval = 0;
	288	}
	289	return retval;
	290	}
	291	case WDIOC_KEEPALIVE:
	292	sch311x_wdt_keepalive();
	293	break;
	294
	295	case WDIOC_SETTIMEOUT:
	296	if (get_user(new_timeout, p))
	297	return -EFAULT;
	298	if (sch311x_wdt_set_heartbeat(new_timeout))
	299	return -EINVAL;
	300	sch311x_wdt_keepalive();
	301	/* Fall */
	302	case WDIOC_GETTIMEOUT:
	303	return put_user(timeout, p);
	304	default:
	305	return -ENOTTY;
	306	}
	307	return 0;
	308	}
	309
	310	static int sch311x_wdt_open(struct inode inode, struct file file)
	311	{
	312	if (test_and_set_bit(0, &sch311x_wdt_is_open))
	313	return -EBUSY;
	314	/*
	315	* Activate
	316	*/
	317	sch311x_wdt_start();
318	return nonseekable_open(inode, file);
319	}
320
321	static int sch311x_wdt_close(struct inode inode, struct file file)
322	{
323	if (sch311x_wdt_expect_close == 42) {
324	sch311x_wdt_stop();
325	} else {
326	printk(KERN_CRIT PFX
327	"Unexpected close, not stopping watchdog!\n");
328	sch311x_wdt_keepalive();
329	}
330	clear_bit(0, &sch311x_wdt_is_open);
331	sch311x_wdt_expect_close = 0;
332	return 0;
333	}
334
335	/*
336	* Kernel Interfaces
337	*/
338
339	static const struct file_operations sch311x_wdt_fops = {
340	.owner = THIS_MODULE,
341	.llseek = no_llseek,
342	.write = sch311x_wdt_write,
343	.unlocked_ioctl = sch311x_wdt_ioctl,
344	.open = sch311x_wdt_open,
345	.release = sch311x_wdt_close,
346	};
347
348	static struct miscdevice sch311x_wdt_miscdev = {
349	.minor = WATCHDOG_MINOR,
350	.name = "watchdog",
351	.fops = &sch311x_wdt_fops,
352	};
353
354	/*
355	* Init & exit routines
356	*/
357
358	static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
359	{
360	struct device *dev = &pdev->dev;
361	unsigned char val;
362	int err;
363
364	spin_lock_init(&sch311x_wdt_data.io_lock);
365
366	if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1,
367	DRV_NAME)) {
368	dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
369	sch311x_wdt_data.runtime_reg + RESGEN,
370	sch311x_wdt_data.runtime_reg + RESGEN);
371	err = -EBUSY;
372	goto exit;
373	}
374
375	if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
376	dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
377	sch311x_wdt_data.runtime_reg + GP60,
378	sch311x_wdt_data.runtime_reg + GP60);
379	err = -EBUSY;
380	goto exit_release_region;
381	}
382
383	if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
384	DRV_NAME)) {
385	dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
386	sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
387	sch311x_wdt_data.runtime_reg + WDT_CTRL);
388	err = -EBUSY;
389	goto exit_release_region2;
390	}
391
392	/* Make sure that the watchdog is not running */
393	sch311x_wdt_stop();
394
395	/* Disable keyboard and mouse interaction and interrupt */
396	/* -- Watchdog timer configuration --
397	* Bit 0 Reserved
398	* Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
399	* Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
400	* Bit 3 Reserved
401	* Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
402	* 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
403	*/
404	outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
405
406	/* Check that the heartbeat value is within it's range ;
407	* if not reset to the default */
408	if (sch311x_wdt_set_heartbeat(timeout)) {
409	sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
410	dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
411	timeout);
412	}
413
414	/* Get status at boot */
415	sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
416
417	/* enable watchdog */
418	/* -- Reset Generator --
419	* Bit 0 Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled
420	* Bit 1 Thermtrip Source Select: O* = No Source, 1 = Source
421	* Bit 2 WDT2_CTL: WDT input bit
422	* Bit 3-7 Reserved
423	*/
424	outb(0, sch311x_wdt_data.runtime_reg + RESGEN);
425	val = therm_trip ? 0x06 : 0x04;
426	outb(val, sch311x_wdt_data.runtime_reg + RESGEN);
427
4c4b638e WVS	428	sch311x_wdt_miscdev.parent = dev;
4c4b638e WVS	429
4c6e63bd WVS	430	err = misc_register(&sch311x_wdt_miscdev);
	431	if (err != 0) {
	432	dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
	433	WATCHDOG_MINOR, err);
	434	goto exit_release_region3;
	435	}
	436
4c6e63bd WVS	437	dev_info(dev,
	438	"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
	439	timeout, nowayout);
	440
	441	return 0;
	442
	443	exit_release_region3:
	444	release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
	445	exit_release_region2:
	446	release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
	447	exit_release_region:
	448	release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
	449	sch311x_wdt_data.runtime_reg = 0;
	450	exit:
	451	return err;
	452	}
	453
	454	static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
	455	{
	456	/* Stop the timer before we leave */
	457	if (!nowayout)
	458	sch311x_wdt_stop();
	459
	460	/* Deregister */
	461	misc_deregister(&sch311x_wdt_miscdev);
	462	release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
	463	release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
	464	release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
	465	sch311x_wdt_data.runtime_reg = 0;
	466	return 0;
	467	}
	468
	469	static void sch311x_wdt_shutdown(struct platform_device *dev)
	470	{
	471	/* Turn the WDT off if we have a soft shutdown */
	472	sch311x_wdt_stop();
	473	}
	474
	475	#define sch311x_wdt_suspend NULL
	476	#define sch311x_wdt_resume NULL
	477
	478	static struct platform_driver sch311x_wdt_driver = {
	479	.probe = sch311x_wdt_probe,
	480	.remove = __devexit_p(sch311x_wdt_remove),
	481	.shutdown = sch311x_wdt_shutdown,
	482	.suspend = sch311x_wdt_suspend,
	483	.resume = sch311x_wdt_resume,
	484	.driver = {
	485	.owner = THIS_MODULE,
	486	.name = DRV_NAME,
	487	},
	488	};
	489
	490	static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
	491	{
	492	int err = 0, reg;
	493	unsigned short base_addr;
	494	unsigned char dev_id;
	495
	496	sch311x_sio_enter(sio_config_port);
	497
	498	/* Check device ID. We currently know about:
	499	* SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
	500	reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
501	if (!(reg == 0x7c \|\| reg == 0x7d \|\| reg == 0x7f)) {
502	err = -ENODEV;
503	goto exit;
504	}
505	dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
506
507	/* Select logical device A (runtime registers) */
508	sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
509
510	/* Check if Logical Device Register is currently active */
511	if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0)
512	printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n");
513
514	/* Get the base address of the runtime registers */
515	base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) \|
516	sch311x_sio_inb(sio_config_port, 0x61);
517	if (!base_addr) {
518	printk(KERN_ERR PFX "Base address not set.\n");
519	err = -ENODEV;
520	goto exit;
521	}
522	*addr = base_addr;
523
524	printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n",
525	dev_id, base_addr);
526
527	exit:
528	sch311x_sio_exit(sio_config_port);
529	return err;
530	}
531
532	static int __init sch311x_wdt_init(void)
533	{
534	int err, i, found = 0;
535	unsigned short addr = 0;
536
537	for (i = 0; !found && sch311x_ioports[i]; i++)
538	if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
539	found++;
540
541	if (!found)
542	return -ENODEV;
543
544	sch311x_wdt_data.runtime_reg = addr;
545
546	err = platform_driver_register(&sch311x_wdt_driver);
547	if (err)
548	return err;
549
550	sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
551	NULL, 0);
552
553	if (IS_ERR(sch311x_wdt_pdev)) {
554	err = PTR_ERR(sch311x_wdt_pdev);
555	goto unreg_platform_driver;
556	}
557
558	return 0;
559
560	unreg_platform_driver:
561	platform_driver_unregister(&sch311x_wdt_driver);
562	return err;
563	}
564
565	static void __exit sch311x_wdt_exit(void)
566	{
567	platform_device_unregister(sch311x_wdt_pdev);
568	platform_driver_unregister(&sch311x_wdt_driver);
569	}
570
571	module_init(sch311x_wdt_init);
572	module_exit(sch311x_wdt_exit);
573
574	MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
575	MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
576	MODULE_LICENSE("GPL");
577	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
578