[linux.git] / drivers / watchdog / sp5100_tco.c

/*
 *	sp5100_tco :	TCO timer driver for sp5100 chipsets
 *
 *	(c) Copyright 2009 Google Inc., All Rights Reserved.
 *
 *	Based on i8xx_tco.c:
 *	(c) Copyright 2000 kernel concepts <[email protected]>, All Rights
 *	Reserved.
 *				http://www.kernelconcepts.de
 *
 *	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.
 *
 *	See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
 */

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

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#include "sp5100_tco.h"

/* Module and version information */
#define TCO_VERSION "0.01"
#define TCO_MODULE_NAME "SP5100 TCO timer"
#define TCO_DRIVER_NAME   TCO_MODULE_NAME ", v" TCO_VERSION
#define PFX TCO_MODULE_NAME ": "

/* internal variables */
static u32 tcobase_phys;
static void __iomem *tcobase;
static unsigned int pm_iobase;
static DEFINE_SPINLOCK(tco_lock);	/* Guards the hardware */
static unsigned long timer_alive;
static char tco_expect_close;
static struct pci_dev *sp5100_tco_pci;

/* the watchdog platform device */
static struct platform_device *sp5100_tco_platform_device;

/* module parameters */

#define WATCHDOG_HEARTBEAT 60	/* 60 sec default heartbeat. */
static int heartbeat = WATCHDOG_HEARTBEAT;  /* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
		 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");

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) ")");

/*
 * Some TCO specific functions
 */
static void tco_timer_start(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val |= SP5100_WDT_START_STOP_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

static void tco_timer_stop(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val &= ~SP5100_WDT_START_STOP_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

static void tco_timer_keepalive(void)
{
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&tco_lock, flags);
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val |= SP5100_WDT_TRIGGER_BIT;
	writel(val, SP5100_WDT_CONTROL(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);
}

static int tco_timer_set_heartbeat(int t)
{
	unsigned long flags;

	if (t < 0 || t > 0xffff)
		return -EINVAL;

	/* Write new heartbeat to watchdog */
	spin_lock_irqsave(&tco_lock, flags);
	writel(t, SP5100_WDT_COUNT(tcobase));
	spin_unlock_irqrestore(&tco_lock, flags);

	heartbeat = t;
	return 0;
}

/*
 *	/dev/watchdog handling
 */

static int sp5100_tco_open(struct inode *inode, struct file *file)
{
	/* /dev/watchdog can only be opened once */
	if (test_and_set_bit(0, &timer_alive))
		return -EBUSY;

	/* Reload and activate timer */
	tco_timer_start();
	tco_timer_keepalive();
	return nonseekable_open(inode, file);
}

static int sp5100_tco_release(struct inode *inode, struct file *file)
{
	/* Shut off the timer. */
	if (tco_expect_close == 42) {
		tco_timer_stop();
	} else {
		printk(KERN_CRIT PFX
			"Unexpected close, not stopping watchdog!\n");
		tco_timer_keepalive();
	}
	clear_bit(0, &timer_alive);
	tco_expect_close = 0;
	return 0;
}

static ssize_t sp5100_tco_write(struct file *file, const char __user *data,
				size_t len, loff_t *ppos)
{
	/* See if we got the magic character 'V' and reload the timer */
	if (len) {
		if (!nowayout) {
			size_t i;

			/* note: just in case someone wrote the magic character
			 * five months ago... */
			tco_expect_close = 0;

			/* scan to see whether or not we got the magic character
			 */
			for (i = 0; i != len; i++) {
				char c;
				if (get_user(c, data + i))
					return -EFAULT;
				if (c == 'V')
					tco_expect_close = 42;
			}
		}

		/* someone wrote to us, we should reload the timer */
		tco_timer_keepalive();
	}
	return len;
}

static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	int new_options, retval = -EINVAL;
	int new_heartbeat;
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.options =		WDIOF_SETTIMEOUT |
					WDIOF_KEEPALIVEPING |
					WDIOF_MAGICCLOSE,
		.firmware_version =	0,
		.identity =		TCO_MODULE_NAME,
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		return copy_to_user(argp, &ident,
			sizeof(ident)) ? -EFAULT : 0;
	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_SETOPTIONS:
		if (get_user(new_options, p))
			return -EFAULT;
		if (new_options & WDIOS_DISABLECARD) {
			tco_timer_stop();
			retval = 0;
		}
		if (new_options & WDIOS_ENABLECARD) {
			tco_timer_start();
			tco_timer_keepalive();
			retval = 0;
		}
		return retval;
	case WDIOC_KEEPALIVE:
		tco_timer_keepalive();
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(new_heartbeat, p))
			return -EFAULT;
		if (tco_timer_set_heartbeat(new_heartbeat))
			return -EINVAL;
		tco_timer_keepalive();
		/* Fall through */
	case WDIOC_GETTIMEOUT:
		return put_user(heartbeat, p);
	default:
		return -ENOTTY;
	}
}

/*
 * Kernel Interfaces
 */

static const struct file_operations sp5100_tco_fops = {
	.owner =		THIS_MODULE,
	.llseek =		no_llseek,
	.write =		sp5100_tco_write,
	.unlocked_ioctl =	sp5100_tco_ioctl,
	.open =			sp5100_tco_open,
	.release =		sp5100_tco_release,
};

static struct miscdevice sp5100_tco_miscdev = {
	.minor =	WATCHDOG_MINOR,
	.name =		"watchdog",
	.fops =		&sp5100_tco_fops,
};

/*
 * Data for PCI driver interface
 *
 * This data only exists for exporting the supported
 * PCI ids via MODULE_DEVICE_TABLE.  We do not actually
 * register a pci_driver, because someone else might
 * want to register another driver on the same PCI id.
 */
static DEFINE_PCI_DEVICE_TABLE(sp5100_tco_pci_tbl) = {
	{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
	  PCI_ANY_ID, },
	{ 0, },			/* End of list */
};
MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);

/*
 * Init & exit routines
 */

static unsigned char __devinit sp5100_tco_setupdevice(void)
{
	struct pci_dev *dev = NULL;
	u32 val;

	/* Match the PCI device */
	for_each_pci_dev(dev) {
		if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
			sp5100_tco_pci = dev;
			break;
		}
	}

	if (!sp5100_tco_pci)
		return 0;

	/* Request the IO ports used by this driver */
	pm_iobase = SP5100_IO_PM_INDEX_REG;
	if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
			pm_iobase);
		goto exit;
	}

	/* Find the watchdog base address. */
	outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
	val = inb(SP5100_IO_PM_DATA_REG);
	outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
	val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
	outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
	val = val << 8 | inb(SP5100_IO_PM_DATA_REG);
	outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
	/* Low three bits of BASE0 are reserved. */
	val = val << 8 | (inb(SP5100_IO_PM_DATA_REG) & 0xf8);

	if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
								"SP5100 TCO")) {
		printk(KERN_ERR PFX "mmio address 0x%04x already in use\n",
			val);
		goto unreg_region;
	}
	tcobase_phys = val;

	tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
	if (tcobase == 0) {
		printk(KERN_ERR PFX "failed to get tcobase address\n");
		goto unreg_mem_region;
	}

	/* Enable watchdog decode bit */
	pci_read_config_dword(sp5100_tco_pci,
			      SP5100_PCI_WATCHDOG_MISC_REG,
			      &val);

	val |= SP5100_PCI_WATCHDOG_DECODE_EN;

	pci_write_config_dword(sp5100_tco_pci,
			       SP5100_PCI_WATCHDOG_MISC_REG,
			       val);

	/* Enable Watchdog timer and set the resolution to 1 sec. */
	outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
	val = inb(SP5100_IO_PM_DATA_REG);
	val |= SP5100_PM_WATCHDOG_SECOND_RES;
	val &= ~SP5100_PM_WATCHDOG_DISABLE;
	outb(val, SP5100_IO_PM_DATA_REG);

	/* Check that the watchdog action is set to reset the system. */
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
	writel(val, SP5100_WDT_CONTROL(tcobase));

	/* Set a reasonable heartbeat before we stop the timer */
	tco_timer_set_heartbeat(heartbeat);

	/*
	 * Stop the TCO before we change anything so we don't race with
	 * a zeroed timer.
	 */
	tco_timer_stop();

	/* Done */
	return 1;

unreg_mem_region:
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
unreg_region:
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
exit:
	return 0;
}

static int __devinit sp5100_tco_init(struct platform_device *dev)
{
	int ret;
	u32 val;

	/* Check whether or not the hardware watchdog is there. If found, then
	 * set it up.
	 */
	if (!sp5100_tco_setupdevice())
		return -ENODEV;

	/* Check to see if last reboot was due to watchdog timeout */
	printk(KERN_INFO PFX "Watchdog reboot %sdetected.\n",
	       readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
		      "" : "not ");

	/* Clear out the old status */
	val = readl(SP5100_WDT_CONTROL(tcobase));
	val &= ~SP5100_PM_WATCHDOG_FIRED;
	writel(val, SP5100_WDT_CONTROL(tcobase));

	/*
	 * Check that the heartbeat value is within it's range.
	 * If not, reset to the default.
	 */
	if (tco_timer_set_heartbeat(heartbeat)) {
		heartbeat = WATCHDOG_HEARTBEAT;
		tco_timer_set_heartbeat(heartbeat);
	}

	ret = misc_register(&sp5100_tco_miscdev);
	if (ret != 0) {
		printk(KERN_ERR PFX "cannot register miscdev on minor="
		       "%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		goto exit;
	}

	clear_bit(0, &timer_alive);

	printk(KERN_INFO PFX "initialized (0x%p). heartbeat=%d sec"
		" (nowayout=%d)\n",
		tcobase, heartbeat, nowayout);

	return 0;

exit:
	iounmap(tcobase);
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
	return ret;
}

static void __devexit sp5100_tco_cleanup(void)
{
	/* Stop the timer before we leave */
	if (!nowayout)
		tco_timer_stop();

	/* Deregister */
	misc_deregister(&sp5100_tco_miscdev);
	iounmap(tcobase);
	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
}

static int __devexit sp5100_tco_remove(struct platform_device *dev)
{
	if (tcobase)
		sp5100_tco_cleanup();
	return 0;
}

static void sp5100_tco_shutdown(struct platform_device *dev)
{
	tco_timer_stop();
}

static struct platform_driver sp5100_tco_driver = {
	.probe		= sp5100_tco_init,
	.remove		= __devexit_p(sp5100_tco_remove),
	.shutdown	= sp5100_tco_shutdown,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= TCO_MODULE_NAME,
	},
};

static int __init sp5100_tco_init_module(void)
{
	int err;

	printk(KERN_INFO PFX "SP5100 TCO WatchDog Timer Driver v%s\n",
	       TCO_VERSION);

	err = platform_driver_register(&sp5100_tco_driver);
	if (err)
		return err;

	sp5100_tco_platform_device = platform_device_register_simple(
					TCO_MODULE_NAME, -1, NULL, 0);
	if (IS_ERR(sp5100_tco_platform_device)) {
		err = PTR_ERR(sp5100_tco_platform_device);
		goto unreg_platform_driver;
	}

	return 0;

unreg_platform_driver:
	platform_driver_unregister(&sp5100_tco_driver);
	return err;
}

static void __exit sp5100_tco_cleanup_module(void)
{
	platform_device_unregister(sp5100_tco_platform_device);
	platform_driver_unregister(&sp5100_tco_driver);
	printk(KERN_INFO PFX "SP5100 TCO Watchdog Module Unloaded.\n");
}

module_init(sp5100_tco_init_module);
module_exit(sp5100_tco_cleanup_module);

MODULE_AUTHOR("Priyanka Gupta");
MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
Commit	Line	Data
15e28bf1 PG	1	/*
	2	* sp5100_tco : TCO timer driver for sp5100 chipsets
	3	*
	4	* (c) Copyright 2009 Google Inc., All Rights Reserved.
	5	*
	6	* Based on i8xx_tco.c:
	7	* (c) Copyright 2000 kernel concepts <[email protected]>, All Rights
	8	* Reserved.
	9	* http://www.kernelconcepts.de
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*
	16	* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide"
	17	*/
	18
	19	/*
	20	* Includes, defines, variables, module parameters, ...
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
	25	#include <linux/types.h>
	26	#include <linux/miscdevice.h>
	27	#include <linux/watchdog.h>
	28	#include <linux/init.h>
	29	#include <linux/fs.h>
	30	#include <linux/pci.h>
	31	#include <linux/ioport.h>
	32	#include <linux/platform_device.h>
	33	#include <linux/uaccess.h>
	34	#include <linux/io.h>
	35
	36	#include "sp5100_tco.h"
	37
	38	/* Module and version information */
	39	#define TCO_VERSION "0.01"
	40	#define TCO_MODULE_NAME "SP5100 TCO timer"
	41	#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
	42	#define PFX TCO_MODULE_NAME ": "
	43
	44	/* internal variables */
90d241ed	45	static u32 tcobase_phys;
15e28bf1 PG	46	static void __iomem *tcobase;
	47	static unsigned int pm_iobase;
	48	static DEFINE_SPINLOCK(tco_lock); /* Guards the hardware */
	49	static unsigned long timer_alive;
	50	static char tco_expect_close;
	51	static struct pci_dev *sp5100_tco_pci;
	52
	53	/* the watchdog platform device */
	54	static struct platform_device *sp5100_tco_platform_device;
	55
	56	/* module parameters */
	57
	58	#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat. */
	59	static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
	60	module_param(heartbeat, int, 0);
	61	MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
	62	__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
	63
	64	static int nowayout = WATCHDOG_NOWAYOUT;
	65	module_param(nowayout, int, 0);
	66	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"
	67	" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	68
	69	/*
	70	* Some TCO specific functions
	71	*/
	72	static void tco_timer_start(void)
	73	{
	74	u32 val;
	75	unsigned long flags;
	76
	77	spin_lock_irqsave(&tco_lock, flags);
	78	val = readl(SP5100_WDT_CONTROL(tcobase));
	79	val \|= SP5100_WDT_START_STOP_BIT;
	80	writel(val, SP5100_WDT_CONTROL(tcobase));
	81	spin_unlock_irqrestore(&tco_lock, flags);
	82	}
	83
	84	static void tco_timer_stop(void)
	85	{
	86	u32 val;
	87	unsigned long flags;
	88
	89	spin_lock_irqsave(&tco_lock, flags);
	90	val = readl(SP5100_WDT_CONTROL(tcobase));
	91	val &= ~SP5100_WDT_START_STOP_BIT;
	92	writel(val, SP5100_WDT_CONTROL(tcobase));
	93	spin_unlock_irqrestore(&tco_lock, flags);
	94	}
	95
	96	static void tco_timer_keepalive(void)
	97	{
	98	u32 val;
	99	unsigned long flags;
	100
	101	spin_lock_irqsave(&tco_lock, flags);
	102	val = readl(SP5100_WDT_CONTROL(tcobase));
	103	val \|= SP5100_WDT_TRIGGER_BIT;
	104	writel(val, SP5100_WDT_CONTROL(tcobase));
	105	spin_unlock_irqrestore(&tco_lock, flags);
	106	}
	107
	108	static int tco_timer_set_heartbeat(int t)
	109	{
110	unsigned long flags;
111
112	if (t < 0 \|\| t > 0xffff)
113	return -EINVAL;
114
115	/* Write new heartbeat to watchdog */
116	spin_lock_irqsave(&tco_lock, flags);
117	writel(t, SP5100_WDT_COUNT(tcobase));
118	spin_unlock_irqrestore(&tco_lock, flags);
119
120	heartbeat = t;
121	return 0;
122	}
123
124	/*
125	* /dev/watchdog handling
126	*/
127
128	static int sp5100_tco_open(struct inode inode, struct file file)
129	{
130	/* /dev/watchdog can only be opened once */
131	if (test_and_set_bit(0, &timer_alive))
132	return -EBUSY;
133
134	/* Reload and activate timer */
135	tco_timer_start();
136	tco_timer_keepalive();
137	return nonseekable_open(inode, file);
138	}
139
140	static int sp5100_tco_release(struct inode inode, struct file file)
141	{
142	/* Shut off the timer. */
143	if (tco_expect_close == 42) {
144	tco_timer_stop();
145	} else {
146	printk(KERN_CRIT PFX
147	"Unexpected close, not stopping watchdog!\n");
148	tco_timer_keepalive();
149	}
150	clear_bit(0, &timer_alive);
151	tco_expect_close = 0;
152	return 0;
153	}
154
155	static ssize_t sp5100_tco_write(struct file file, const char __user data,
156	size_t len, loff_t *ppos)
157	{
158	/* See if we got the magic character 'V' and reload the timer */
159	if (len) {
160	if (!nowayout) {
161	size_t i;
162
163	/* note: just in case someone wrote the magic character
164	* five months ago... */
165	tco_expect_close = 0;
166
167	/* scan to see whether or not we got the magic character
168	*/
169	for (i = 0; i != len; i++) {
170	char c;
171	if (get_user(c, data + i))
172	return -EFAULT;
173	if (c == 'V')
174	tco_expect_close = 42;
175	}
176	}
177
178	/* someone wrote to us, we should reload the timer */
179	tco_timer_keepalive();
180	}
181	return len;
182	}
183
184	static long sp5100_tco_ioctl(struct file *file, unsigned int cmd,
185	unsigned long arg)
186	{
187	int new_options, retval = -EINVAL;
188	int new_heartbeat;
189	void __user argp = (void __user )arg;
190	int __user *p = argp;
191	static const struct watchdog_info ident = {
192	.options = WDIOF_SETTIMEOUT \|
193	WDIOF_KEEPALIVEPING \|
194	WDIOF_MAGICCLOSE,
195	.firmware_version = 0,
196	.identity = TCO_MODULE_NAME,
197	};
198
199	switch (cmd) {
200	case WDIOC_GETSUPPORT:
201	return copy_to_user(argp, &ident,
202	sizeof(ident)) ? -EFAULT : 0;
203	case WDIOC_GETSTATUS:
204	case WDIOC_GETBOOTSTATUS:
205	return put_user(0, p);
206	case WDIOC_SETOPTIONS:
207	if (get_user(new_options, p))
208	return -EFAULT;
209	if (new_options & WDIOS_DISABLECARD) {
210	tco_timer_stop();
211	retval = 0;
212	}
213	if (new_options & WDIOS_ENABLECARD) {
214	tco_timer_start();
215	tco_timer_keepalive();
216	retval = 0;
217	}
218	return retval;
219	case WDIOC_KEEPALIVE:
220	tco_timer_keepalive();
221	return 0;
222	case WDIOC_SETTIMEOUT:
223	if (get_user(new_heartbeat, p))
224	return -EFAULT;
225	if (tco_timer_set_heartbeat(new_heartbeat))
226	return -EINVAL;
227	tco_timer_keepalive();
228	/* Fall through */
229	case WDIOC_GETTIMEOUT:
230	return put_user(heartbeat, p);
231	default:
232	return -ENOTTY;
233	}
234	}
235
236	/*
237	* Kernel Interfaces
238	*/
239
240	static const struct file_operations sp5100_tco_fops = {
241	.owner = THIS_MODULE,
242	.llseek = no_llseek,
243	.write = sp5100_tco_write,
244	.unlocked_ioctl = sp5100_tco_ioctl,
245	.open = sp5100_tco_open,
246	.release = sp5100_tco_release,
247	};
248
249	static struct miscdevice sp5100_tco_miscdev = {
250	.minor = WATCHDOG_MINOR,
251	.name = "watchdog",
252	.fops = &sp5100_tco_fops,
253	};
254
255	/*
256	* Data for PCI driver interface
257	*
258	* This data only exists for exporting the supported
259	* PCI ids via MODULE_DEVICE_TABLE. We do not actually
260	* register a pci_driver, because someone else might
261	* want to register another driver on the same PCI id.
262	*/
4562f539	263	static DEFINE_PCI_DEVICE_TABLE(sp5100_tco_pci_tbl) = {
15e28bf1 PG	264	{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
	265	PCI_ANY_ID, },
	266	{ 0, }, /* End of list */
	267	};
	268	MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
	269
	270	/*
	271	* Init & exit routines
	272	*/
	273
	274	static unsigned char __devinit sp5100_tco_setupdevice(void)
	275	{
	276	struct pci_dev *dev = NULL;
	277	u32 val;
	278
	279	/* Match the PCI device */
	280	for_each_pci_dev(dev) {
	281	if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
	282	sp5100_tco_pci = dev;
	283	break;
	284	}
	285	}
	286
	287	if (!sp5100_tco_pci)
	288	return 0;
	289
	290	/* Request the IO ports used by this driver */
	291	pm_iobase = SP5100_IO_PM_INDEX_REG;
	292	if (!request_region(pm_iobase, SP5100_PM_IOPORTS_SIZE, "SP5100 TCO")) {
	293	printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
	294	pm_iobase);
	295	goto exit;
	296	}
	297
	298	/* Find the watchdog base address. */
	299	outb(SP5100_PM_WATCHDOG_BASE3, SP5100_IO_PM_INDEX_REG);
	300	val = inb(SP5100_IO_PM_DATA_REG);
	301	outb(SP5100_PM_WATCHDOG_BASE2, SP5100_IO_PM_INDEX_REG);
	302	val = val << 8 \| inb(SP5100_IO_PM_DATA_REG);
	303	outb(SP5100_PM_WATCHDOG_BASE1, SP5100_IO_PM_INDEX_REG);
	304	val = val << 8 \| inb(SP5100_IO_PM_DATA_REG);
	305	outb(SP5100_PM_WATCHDOG_BASE0, SP5100_IO_PM_INDEX_REG);
	306	/* Low three bits of BASE0 are reserved. */
	307	val = val << 8 \| (inb(SP5100_IO_PM_DATA_REG) & 0xf8);
	308
90d241ed YL	309	if (!request_mem_region_exclusive(val, SP5100_WDT_MEM_MAP_SIZE,
	310	"SP5100 TCO")) {
	311	printk(KERN_ERR PFX "mmio address 0x%04x already in use\n",
	312	val);
	313	goto unreg_region;
	314	}
	315	tcobase_phys = val;
	316
15e28bf1 PG	317	tcobase = ioremap(val, SP5100_WDT_MEM_MAP_SIZE);
	318	if (tcobase == 0) {
	319	printk(KERN_ERR PFX "failed to get tcobase address\n");
90d241ed	320	goto unreg_mem_region;
15e28bf1 PG	321	}
	322
	323	/* Enable watchdog decode bit */
	324	pci_read_config_dword(sp5100_tco_pci,
	325	SP5100_PCI_WATCHDOG_MISC_REG,
	326	&val);
	327
	328	val \|= SP5100_PCI_WATCHDOG_DECODE_EN;
	329
	330	pci_write_config_dword(sp5100_tco_pci,
	331	SP5100_PCI_WATCHDOG_MISC_REG,
	332	val);
	333
	334	/* Enable Watchdog timer and set the resolution to 1 sec. */
	335	outb(SP5100_PM_WATCHDOG_CONTROL, SP5100_IO_PM_INDEX_REG);
	336	val = inb(SP5100_IO_PM_DATA_REG);
	337	val \|= SP5100_PM_WATCHDOG_SECOND_RES;
	338	val &= ~SP5100_PM_WATCHDOG_DISABLE;
	339	outb(val, SP5100_IO_PM_DATA_REG);
	340
	341	/* Check that the watchdog action is set to reset the system. */
	342	val = readl(SP5100_WDT_CONTROL(tcobase));
	343	val &= ~SP5100_PM_WATCHDOG_ACTION_RESET;
	344	writel(val, SP5100_WDT_CONTROL(tcobase));
	345
	346	/* Set a reasonable heartbeat before we stop the timer */
	347	tco_timer_set_heartbeat(heartbeat);
	348
	349	/*
	350	* Stop the TCO before we change anything so we don't race with
	351	* a zeroed timer.
	352	*/
	353	tco_timer_stop();
	354
	355	/* Done */
	356	return 1;
	357
90d241ed YL	358	unreg_mem_region:
90d241ed YL	359	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
15e28bf1 PG	360	unreg_region:
	361	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
	362	exit:
	363	return 0;
	364	}
	365
	366	static int __devinit sp5100_tco_init(struct platform_device *dev)
	367	{
	368	int ret;
	369	u32 val;
	370
	371	/* Check whether or not the hardware watchdog is there. If found, then
	372	* set it up.
	373	*/
	374	if (!sp5100_tco_setupdevice())
	375	return -ENODEV;
	376
	377	/* Check to see if last reboot was due to watchdog timeout */
	378	printk(KERN_INFO PFX "Watchdog reboot %sdetected.\n",
	379	readl(SP5100_WDT_CONTROL(tcobase)) & SP5100_PM_WATCHDOG_FIRED ?
	380	"" : "not ");
	381
	382	/* Clear out the old status */
	383	val = readl(SP5100_WDT_CONTROL(tcobase));
	384	val &= ~SP5100_PM_WATCHDOG_FIRED;
	385	writel(val, SP5100_WDT_CONTROL(tcobase));
	386
	387	/*
	388	* Check that the heartbeat value is within it's range.
	389	* If not, reset to the default.
	390	*/
	391	if (tco_timer_set_heartbeat(heartbeat)) {
	392	heartbeat = WATCHDOG_HEARTBEAT;
	393	tco_timer_set_heartbeat(heartbeat);
	394	}
	395
	396	ret = misc_register(&sp5100_tco_miscdev);
	397	if (ret != 0) {
	398	printk(KERN_ERR PFX "cannot register miscdev on minor="
	399	"%d (err=%d)\n",
	400	WATCHDOG_MINOR, ret);
	401	goto exit;
	402	}
	403
	404	clear_bit(0, &timer_alive);
	405
	406	printk(KERN_INFO PFX "initialized (0x%p). heartbeat=%d sec"
	407	" (nowayout=%d)\n",
	408	tcobase, heartbeat, nowayout);
	409
	410	return 0;
	411
	412	exit:
	413	iounmap(tcobase);
90d241ed	414	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
15e28bf1 PG	415	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
	416	return ret;
	417	}
	418
	419	static void __devexit sp5100_tco_cleanup(void)
	420	{
	421	/* Stop the timer before we leave */
	422	if (!nowayout)
	423	tco_timer_stop();
	424
	425	/* Deregister */
	426	misc_deregister(&sp5100_tco_miscdev);
	427	iounmap(tcobase);
90d241ed	428	release_mem_region(tcobase_phys, SP5100_WDT_MEM_MAP_SIZE);
15e28bf1 PG	429	release_region(pm_iobase, SP5100_PM_IOPORTS_SIZE);
	430	}
	431
	432	static int __devexit sp5100_tco_remove(struct platform_device *dev)
	433	{
	434	if (tcobase)
	435	sp5100_tco_cleanup();
	436	return 0;
	437	}
	438
	439	static void sp5100_tco_shutdown(struct platform_device *dev)
	440	{
	441	tco_timer_stop();
	442	}
	443
	444	static struct platform_driver sp5100_tco_driver = {
	445	.probe = sp5100_tco_init,
	446	.remove = __devexit_p(sp5100_tco_remove),
	447	.shutdown = sp5100_tco_shutdown,
	448	.driver = {
	449	.owner = THIS_MODULE,
	450	.name = TCO_MODULE_NAME,
	451	},
	452	};
	453
	454	static int __init sp5100_tco_init_module(void)
	455	{
	456	int err;
	457
	458	printk(KERN_INFO PFX "SP5100 TCO WatchDog Timer Driver v%s\n",
	459	TCO_VERSION);
	460
	461	err = platform_driver_register(&sp5100_tco_driver);
	462	if (err)
	463	return err;
	464
	465	sp5100_tco_platform_device = platform_device_register_simple(
	466	TCO_MODULE_NAME, -1, NULL, 0);
	467	if (IS_ERR(sp5100_tco_platform_device)) {
	468	err = PTR_ERR(sp5100_tco_platform_device);
	469	goto unreg_platform_driver;
	470	}
	471
	472	return 0;
	473
	474	unreg_platform_driver:
	475	platform_driver_unregister(&sp5100_tco_driver);
	476	return err;
	477	}
	478
	479	static void __exit sp5100_tco_cleanup_module(void)
	480	{
	481	platform_device_unregister(sp5100_tco_platform_device);
	482	platform_driver_unregister(&sp5100_tco_driver);
	483	printk(KERN_INFO PFX "SP5100 TCO Watchdog Module Unloaded.\n");
	484	}
	485
	486	module_init(sp5100_tco_init_module);
	487	module_exit(sp5100_tco_cleanup_module);
	488
	489	MODULE_AUTHOR("Priyanka Gupta");
	490	MODULE_DESCRIPTION("TCO timer driver for SP5100 chipset");
	491	MODULE_LICENSE("GPL");
	492	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);