[linux.git] / drivers / watchdog / i6300esb.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	i6300esb:	Watchdog timer driver for Intel 6300ESB chipset
 *
 *	(c) Copyright 2004 Google Inc.
 *	(c) Copyright 2005 David Härdeman <[email protected]>
 *
 *	based on i810-tco.c which is in turn based on softdog.c
 *
 *	The timer is implemented in the following I/O controller hubs:
 *	(See the intel documentation on http://developer.intel.com.)
 *	6300ESB chip : document number 300641-004
 *
 *  2004YYZZ Ross Biro
 *	Initial version 0.01
 *  2004YYZZ Ross Biro
 *	Version 0.02
 *  20050210 David Härdeman <[email protected]>
 *	Ported driver to kernel 2.6
 *  20171016 Radu Rendec <[email protected]>
 *	Change driver to use the watchdog subsystem
 *	Add support for multiple 6300ESB devices
 */

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

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/uaccess.h>
#include <linux/io.h>

/* Module and version information */
#define ESB_MODULE_NAME "i6300ESB timer"

/* PCI configuration registers */
#define ESB_CONFIG_REG  0x60            /* Config register                   */
#define ESB_LOCK_REG    0x68            /* WDT lock register                 */

/* Memory mapped registers */
#define ESB_TIMER1_REG(w) ((w)->base + 0x00)/* Timer1 value after each reset */
#define ESB_TIMER2_REG(w) ((w)->base + 0x04)/* Timer2 value after each reset */
#define ESB_GINTSR_REG(w) ((w)->base + 0x08)/* General Interrupt Status Reg  */
#define ESB_RELOAD_REG(w) ((w)->base + 0x0c)/* Reload register               */

/* Lock register bits */
#define ESB_WDT_FUNC    (0x01 << 2)   /* Watchdog functionality            */
#define ESB_WDT_ENABLE  (0x01 << 1)   /* Enable WDT                        */
#define ESB_WDT_LOCK    (0x01 << 0)   /* Lock (nowayout)                   */

/* Config register bits */
#define ESB_WDT_REBOOT  (0x01 << 5)   /* Enable reboot on timeout          */
#define ESB_WDT_FREQ    (0x01 << 2)   /* Decrement frequency               */
#define ESB_WDT_INTTYPE (0x03 << 0)   /* Interrupt type on timer1 timeout  */

/* Reload register bits */
#define ESB_WDT_TIMEOUT (0x01 << 9)    /* Watchdog timed out                */
#define ESB_WDT_RELOAD  (0x01 << 8)    /* prevent timeout                   */

/* Magic constants */
#define ESB_UNLOCK1     0x80            /* Step 1 to unlock reset registers  */
#define ESB_UNLOCK2     0x86            /* Step 2 to unlock reset registers  */

/* module parameters */
/* 30 sec default heartbeat (1 < heartbeat < 2*1023) */
#define ESB_HEARTBEAT_MIN	1
#define ESB_HEARTBEAT_MAX	2046
#define ESB_HEARTBEAT_DEFAULT	30
#define ESB_HEARTBEAT_RANGE __MODULE_STRING(ESB_HEARTBEAT_MIN) \
	"<heartbeat<" __MODULE_STRING(ESB_HEARTBEAT_MAX)
static int heartbeat; /* in seconds */
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat,
	"Watchdog heartbeat in seconds. (" ESB_HEARTBEAT_RANGE
	", default=" __MODULE_STRING(ESB_HEARTBEAT_DEFAULT) ")");

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) ")");

/* internal variables */
struct esb_dev {
	struct watchdog_device wdd;
	void __iomem *base;
	struct pci_dev *pdev;
};

#define to_esb_dev(wptr) container_of(wptr, struct esb_dev, wdd)

/*
 * Some i6300ESB specific functions
 */

/*
 * Prepare for reloading the timer by unlocking the proper registers.
 * This is performed by first writing 0x80 followed by 0x86 to the
 * reload register. After this the appropriate registers can be written
 * to once before they need to be unlocked again.
 */
static inline void esb_unlock_registers(struct esb_dev *edev)
{
	writew(ESB_UNLOCK1, ESB_RELOAD_REG(edev));
	writew(ESB_UNLOCK2, ESB_RELOAD_REG(edev));
}

static int esb_timer_start(struct watchdog_device *wdd)
{
	struct esb_dev *edev = to_esb_dev(wdd);
	int _wdd_nowayout = test_bit(WDOG_NO_WAY_OUT, &wdd->status);
	u8 val;

	esb_unlock_registers(edev);
	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
	/* Enable or Enable + Lock? */
	val = ESB_WDT_ENABLE | (_wdd_nowayout ? ESB_WDT_LOCK : 0x00);
	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, val);
	return 0;
}

static int esb_timer_stop(struct watchdog_device *wdd)
{
	struct esb_dev *edev = to_esb_dev(wdd);
	u8 val;

	/* First, reset timers as suggested by the docs */
	esb_unlock_registers(edev);
	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
	/* Then disable the WDT */
	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x0);
	pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val);

	/* Returns 0 if the timer was disabled, non-zero otherwise */
	return val & ESB_WDT_ENABLE;
}

static int esb_timer_keepalive(struct watchdog_device *wdd)
{
	struct esb_dev *edev = to_esb_dev(wdd);

	esb_unlock_registers(edev);
	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
	/* FIXME: Do we need to flush anything here? */
	return 0;
}

static int esb_timer_set_heartbeat(struct watchdog_device *wdd,
		unsigned int time)
{
	struct esb_dev *edev = to_esb_dev(wdd);
	u32 val;

	/* We shift by 9, so if we are passed a value of 1 sec,
	 * val will be 1 << 9 = 512, then write that to two
	 * timers => 2 * 512 = 1024 (which is decremented at 1KHz)
	 */
	val = time << 9;

	/* Write timer 1 */
	esb_unlock_registers(edev);
	writel(val, ESB_TIMER1_REG(edev));

	/* Write timer 2 */
	esb_unlock_registers(edev);
	writel(val, ESB_TIMER2_REG(edev));

	/* Reload */
	esb_unlock_registers(edev);
	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));

	/* FIXME: Do we need to flush everything out? */

	/* Done */
	wdd->timeout = time;
	return 0;
}

/*
 * Watchdog Subsystem Interfaces
 */

static struct watchdog_info esb_info = {
	.identity = ESB_MODULE_NAME,
	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
};

static const struct watchdog_ops esb_ops = {
	.owner = THIS_MODULE,
	.start = esb_timer_start,
	.stop = esb_timer_stop,
	.set_timeout = esb_timer_set_heartbeat,
	.ping = esb_timer_keepalive,
};

/*
 * Data for PCI driver interface
 */
static const struct pci_device_id esb_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
	{ 0, },                 /* End of list */
};
MODULE_DEVICE_TABLE(pci, esb_pci_tbl);

/*
 *      Init & exit routines
 */

static unsigned char esb_getdevice(struct esb_dev *edev)
{
	if (pci_enable_device(edev->pdev)) {
		dev_err(&edev->pdev->dev, "failed to enable device\n");
		goto err_devput;
	}

	if (pci_request_region(edev->pdev, 0, ESB_MODULE_NAME)) {
		dev_err(&edev->pdev->dev, "failed to request region\n");
		goto err_disable;
	}

	edev->base = pci_ioremap_bar(edev->pdev, 0);
	if (edev->base == NULL) {
		/* Something's wrong here, BASEADDR has to be set */
		dev_err(&edev->pdev->dev, "failed to get BASEADDR\n");
		goto err_release;
	}

	/* Done */
	dev_set_drvdata(&edev->pdev->dev, edev);
	return 1;

err_release:
	pci_release_region(edev->pdev, 0);
err_disable:
	pci_disable_device(edev->pdev);
err_devput:
	return 0;
}

static void esb_initdevice(struct esb_dev *edev)
{
	u8 val1;
	u16 val2;

	/*
	 * Config register:
	 * Bit    5 : 0 = Enable WDT_OUTPUT
	 * Bit    2 : 0 = set the timer frequency to the PCI clock
	 * divided by 2^15 (approx 1KHz).
	 * Bits 1:0 : 11 = WDT_INT_TYPE Disabled.
	 * The watchdog has two timers, it can be setup so that the
	 * expiry of timer1 results in an interrupt and the expiry of
	 * timer2 results in a reboot. We set it to not generate
	 * any interrupts as there is not much we can do with it
	 * right now.
	 */
	pci_write_config_word(edev->pdev, ESB_CONFIG_REG, 0x0003);

	/* Check that the WDT isn't already locked */
	pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val1);
	if (val1 & ESB_WDT_LOCK)
		dev_warn(&edev->pdev->dev, "nowayout already set\n");

	/* Set the timer to watchdog mode and disable it for now */
	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x00);

	/* Check if the watchdog was previously triggered */
	esb_unlock_registers(edev);
	val2 = readw(ESB_RELOAD_REG(edev));
	if (val2 & ESB_WDT_TIMEOUT)
		edev->wdd.bootstatus = WDIOF_CARDRESET;

	/* Reset WDT_TIMEOUT flag and timers */
	esb_unlock_registers(edev);
	writew((ESB_WDT_TIMEOUT | ESB_WDT_RELOAD), ESB_RELOAD_REG(edev));

	/* And set the correct timeout value */
	esb_timer_set_heartbeat(&edev->wdd, edev->wdd.timeout);
}

static int esb_probe(struct pci_dev *pdev,
		const struct pci_device_id *ent)
{
	struct esb_dev *edev;
	int ret;

	edev = devm_kzalloc(&pdev->dev, sizeof(*edev), GFP_KERNEL);
	if (!edev)
		return -ENOMEM;

	/* Check whether or not the hardware watchdog is there */
	edev->pdev = pdev;
	if (!esb_getdevice(edev))
		return -ENODEV;

	/* Initialize the watchdog and make sure it does not run */
	edev->wdd.info = &esb_info;
	edev->wdd.ops = &esb_ops;
	edev->wdd.min_timeout = ESB_HEARTBEAT_MIN;
	edev->wdd.max_timeout = ESB_HEARTBEAT_MAX;
	edev->wdd.timeout = ESB_HEARTBEAT_DEFAULT;
	watchdog_init_timeout(&edev->wdd, heartbeat, NULL);
	watchdog_set_nowayout(&edev->wdd, nowayout);
	watchdog_stop_on_reboot(&edev->wdd);
	watchdog_stop_on_unregister(&edev->wdd);
	esb_initdevice(edev);

	/* Register the watchdog so that userspace has access to it */
	ret = watchdog_register_device(&edev->wdd);
	if (ret != 0)
		goto err_unmap;
	dev_info(&pdev->dev,
		"initialized. heartbeat=%d sec (nowayout=%d)\n",
		edev->wdd.timeout, nowayout);
	return 0;

err_unmap:
	iounmap(edev->base);
	pci_release_region(edev->pdev, 0);
	pci_disable_device(edev->pdev);
	return ret;
}

static void esb_remove(struct pci_dev *pdev)
{
	struct esb_dev *edev = dev_get_drvdata(&pdev->dev);

	watchdog_unregister_device(&edev->wdd);
	iounmap(edev->base);
	pci_release_region(edev->pdev, 0);
	pci_disable_device(edev->pdev);
}

static struct pci_driver esb_driver = {
	.name		= ESB_MODULE_NAME,
	.id_table	= esb_pci_tbl,
	.probe          = esb_probe,
	.remove         = esb_remove,
};

module_pci_driver(esb_driver);

MODULE_AUTHOR("Ross Biro and David Härdeman");
MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets");
MODULE_LICENSE("GPL");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
cc90ef0f	2	/*
abda5c8b	3	* i6300esb: Watchdog timer driver for Intel 6300ESB chipset
cc90ef0f DH	4	*
cc90ef0f DH	5	* (c) Copyright 2004 Google Inc.
96de0e25	6	* (c) Copyright 2005 David Härdeman <[email protected]>
cc90ef0f	7	*
7944d3a5	8	* based on i810-tco.c which is in turn based on softdog.c
cc90ef0f	9	*
7944d3a5 WVS	10	* The timer is implemented in the following I/O controller hubs:
7944d3a5 WVS	11	* (See the intel documentation on http://developer.intel.com.)
0426fd0d	12	* 6300ESB chip : document number 300641-004
cc90ef0f DH	13	*
	14	* 2004YYZZ Ross Biro
	15	* Initial version 0.01
	16	* 2004YYZZ Ross Biro
7944d3a5	17	* Version 0.02
96de0e25	18	* 20050210 David Härdeman <[email protected]>
7944d3a5	19	* Ported driver to kernel 2.6
7af4ac87 RR	20	* 20171016 Radu Rendec <[email protected]>
7af4ac87 RR	21	* Change driver to use the watchdog subsystem
cf73120b	22	* Add support for multiple 6300ESB devices
cc90ef0f DH	23	*/
	24
	25	/*
	26	* Includes, defines, variables, module parameters, ...
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/types.h>
	31	#include <linux/kernel.h>
	32	#include <linux/fs.h>
	33	#include <linux/mm.h>
	34	#include <linux/miscdevice.h>
	35	#include <linux/watchdog.h>
cc90ef0f DH	36	#include <linux/pci.h>
cc90ef0f DH	37	#include <linux/ioport.h>
0829291e AC	38	#include <linux/uaccess.h>
0829291e AC	39	#include <linux/io.h>
cc90ef0f	40
cc90ef0f	41	/* Module and version information */
cc90ef0f	42	#define ESB_MODULE_NAME "i6300ESB timer"
cc90ef0f	43
abda5c8b DH	44	/* PCI configuration registers */
	45	#define ESB_CONFIG_REG 0x60 /* Config register */
	46	#define ESB_LOCK_REG 0x68 /* WDT lock register */
	47
	48	/* Memory mapped registers */
cf73120b RR	49	#define ESB_TIMER1_REG(w) ((w)->base + 0x00)/* Timer1 value after each reset */
	50	#define ESB_TIMER2_REG(w) ((w)->base + 0x04)/* Timer2 value after each reset */
	51	#define ESB_GINTSR_REG(w) ((w)->base + 0x08)/* General Interrupt Status Reg */
	52	#define ESB_RELOAD_REG(w) ((w)->base + 0x0c)/* Reload register */
abda5c8b DH	53
abda5c8b DH	54	/* Lock register bits */
0829291e AC	55	#define ESB_WDT_FUNC (0x01 << 2) /* Watchdog functionality */
	56	#define ESB_WDT_ENABLE (0x01 << 1) /* Enable WDT */
	57	#define ESB_WDT_LOCK (0x01 << 0) /* Lock (nowayout) */
abda5c8b DH	58
abda5c8b DH	59	/* Config register bits */
0829291e AC	60	#define ESB_WDT_REBOOT (0x01 << 5) /* Enable reboot on timeout */
0829291e AC	61	#define ESB_WDT_FREQ (0x01 << 2) /* Decrement frequency */
39f3be72	62	#define ESB_WDT_INTTYPE (0x03 << 0) /* Interrupt type on timer1 timeout */
abda5c8b DH	63
abda5c8b DH	64	/* Reload register bits */
31838d9d	65	#define ESB_WDT_TIMEOUT (0x01 << 9) /* Watchdog timed out */
0829291e	66	#define ESB_WDT_RELOAD (0x01 << 8) /* prevent timeout */
abda5c8b DH	67
	68	/* Magic constants */
	69	#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */
	70	#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */
	71
cc90ef0f	72	/* module parameters */
0829291e	73	/* 30 sec default heartbeat (1 < heartbeat < 21023) /
568d6015 RR	74	#define ESB_HEARTBEAT_MIN 1
	75	#define ESB_HEARTBEAT_MAX 2046
	76	#define ESB_HEARTBEAT_DEFAULT 30
	77	#define ESB_HEARTBEAT_RANGE __MODULE_STRING(ESB_HEARTBEAT_MIN) \
	78	"<heartbeat<" __MODULE_STRING(ESB_HEARTBEAT_MAX)
7af4ac87	79	static int heartbeat; /* in seconds */
cc90ef0f	80	module_param(heartbeat, int, 0);
0829291e	81	MODULE_PARM_DESC(heartbeat,
568d6015 RR	82	"Watchdog heartbeat in seconds. (" ESB_HEARTBEAT_RANGE
568d6015 RR	83	", default=" __MODULE_STRING(ESB_HEARTBEAT_DEFAULT) ")");
cc90ef0f	84
86a1e189 WVS	85	static bool nowayout = WATCHDOG_NOWAYOUT;
86a1e189 WVS	86	module_param(nowayout, bool, 0);
0829291e AC	87	MODULE_PARM_DESC(nowayout,
	88	"Watchdog cannot be stopped once started (default="
	89	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
cc90ef0f	90
cf73120b RR	91	/* internal variables */
	92	struct esb_dev {
	93	struct watchdog_device wdd;
	94	void __iomem *base;
	95	struct pci_dev *pdev;
	96	};
	97
	98	#define to_esb_dev(wptr) container_of(wptr, struct esb_dev, wdd)
	99
cc90ef0f DH	100	/*
	101	* Some i6300ESB specific functions
	102	*/
	103
	104	/*
	105	* Prepare for reloading the timer by unlocking the proper registers.
	106	* This is performed by first writing 0x80 followed by 0x86 to the
	107	* reload register. After this the appropriate registers can be written
	108	* to once before they need to be unlocked again.
	109	*/
cf73120b	110	static inline void esb_unlock_registers(struct esb_dev *edev)
7944d3a5	111	{
cf73120b RR	112	writew(ESB_UNLOCK1, ESB_RELOAD_REG(edev));
cf73120b RR	113	writew(ESB_UNLOCK2, ESB_RELOAD_REG(edev));
cc90ef0f DH	114	}
cc90ef0f DH	115
7af4ac87	116	static int esb_timer_start(struct watchdog_device *wdd)
cc90ef0f	117	{
cf73120b	118	struct esb_dev *edev = to_esb_dev(wdd);
7af4ac87	119	int _wdd_nowayout = test_bit(WDOG_NO_WAY_OUT, &wdd->status);
cc90ef0f DH	120	u8 val;
cc90ef0f DH	121
cf73120b RR	122	esb_unlock_registers(edev);
cf73120b RR	123	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
cc90ef0f	124	/* Enable or Enable + Lock? */
7af4ac87	125	val = ESB_WDT_ENABLE \| (_wdd_nowayout ? ESB_WDT_LOCK : 0x00);
cf73120b	126	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, val);
3b9d49ee	127	return 0;
cc90ef0f DH	128	}
cc90ef0f DH	129
7af4ac87	130	static int esb_timer_stop(struct watchdog_device *wdd)
cc90ef0f	131	{
cf73120b	132	struct esb_dev *edev = to_esb_dev(wdd);
cc90ef0f DH	133	u8 val;
cc90ef0f DH	134
cc90ef0f	135	/* First, reset timers as suggested by the docs */
cf73120b RR	136	esb_unlock_registers(edev);
cf73120b RR	137	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
cc90ef0f	138	/* Then disable the WDT */
cf73120b RR	139	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x0);
cf73120b RR	140	pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val);
cc90ef0f DH	141
cc90ef0f DH	142	/* Returns 0 if the timer was disabled, non-zero otherwise */
fc8a9d83	143	return val & ESB_WDT_ENABLE;
cc90ef0f DH	144	}
cc90ef0f DH	145
7af4ac87	146	static int esb_timer_keepalive(struct watchdog_device *wdd)
cc90ef0f	147	{
cf73120b RR	148	struct esb_dev *edev = to_esb_dev(wdd);
	149
	150	esb_unlock_registers(edev);
	151	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
0829291e	152	/* FIXME: Do we need to flush anything here? */
7af4ac87	153	return 0;
cc90ef0f DH	154	}
cc90ef0f DH	155
7af4ac87 RR	156	static int esb_timer_set_heartbeat(struct watchdog_device *wdd,
7af4ac87 RR	157	unsigned int time)
cc90ef0f	158	{
cf73120b	159	struct esb_dev *edev = to_esb_dev(wdd);
cc90ef0f DH	160	u32 val;
cc90ef0f DH	161
cc90ef0f DH	162	/* We shift by 9, so if we are passed a value of 1 sec,
	163	* val will be 1 << 9 = 512, then write that to two
	164	* timers => 2 * 512 = 1024 (which is decremented at 1KHz)
	165	*/
	166	val = time << 9;
	167
	168	/* Write timer 1 */
cf73120b RR	169	esb_unlock_registers(edev);
cf73120b RR	170	writel(val, ESB_TIMER1_REG(edev));
cc90ef0f DH	171
cc90ef0f DH	172	/* Write timer 2 */
cf73120b RR	173	esb_unlock_registers(edev);
cf73120b RR	174	writel(val, ESB_TIMER2_REG(edev));
cc90ef0f	175
0829291e	176	/* Reload */
cf73120b RR	177	esb_unlock_registers(edev);
cf73120b RR	178	writew(ESB_WDT_RELOAD, ESB_RELOAD_REG(edev));
cc90ef0f DH	179
	180	/* FIXME: Do we need to flush everything out? */
	181
	182	/* Done */
7af4ac87	183	wdd->timeout = time;
cc90ef0f DH	184	return 0;
	185	}
	186
cc90ef0f	187	/*
7af4ac87	188	* Watchdog Subsystem Interfaces
cc90ef0f DH	189	*/
cc90ef0f DH	190
7af4ac87 RR	191	static struct watchdog_info esb_info = {
	192	.identity = ESB_MODULE_NAME,
	193	.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \| WDIOF_MAGICCLOSE,
	194	};
cc90ef0f	195
7af4ac87	196	static const struct watchdog_ops esb_ops = {
0829291e	197	.owner = THIS_MODULE,
7af4ac87 RR	198	.start = esb_timer_start,
	199	.stop = esb_timer_stop,
	200	.set_timeout = esb_timer_set_heartbeat,
	201	.ping = esb_timer_keepalive,
cc90ef0f DH	202	};
cc90ef0f DH	203
cc90ef0f DH	204	/*
cc90ef0f DH	205	* Data for PCI driver interface
cc90ef0f	206	*/
bc17f9dc	207	static const struct pci_device_id esb_pci_tbl[] = {
0829291e AC	208	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), },
0829291e AC	209	{ 0, }, /* End of list */
cc90ef0f	210	};
0829291e	211	MODULE_DEVICE_TABLE(pci, esb_pci_tbl);
cc90ef0f DH	212
	213	/*
	214	* Init & exit routines
	215	*/
	216
cf73120b	217	static unsigned char esb_getdevice(struct esb_dev *edev)
cc90ef0f	218	{
cf73120b RR	219	if (pci_enable_device(edev->pdev)) {
cf73120b RR	220	dev_err(&edev->pdev->dev, "failed to enable device\n");
fc8a9d83 WVS	221	goto err_devput;
fc8a9d83 WVS	222	}
cc90ef0f	223
cf73120b RR	224	if (pci_request_region(edev->pdev, 0, ESB_MODULE_NAME)) {
cf73120b RR	225	dev_err(&edev->pdev->dev, "failed to request region\n");
fc8a9d83 WVS	226	goto err_disable;
fc8a9d83 WVS	227	}
cc90ef0f	228
cf73120b RR	229	edev->base = pci_ioremap_bar(edev->pdev, 0);
cf73120b RR	230	if (edev->base == NULL) {
fc8a9d83	231	/* Something's wrong here, BASEADDR has to be set */
cf73120b	232	dev_err(&edev->pdev->dev, "failed to get BASEADDR\n");
fc8a9d83 WVS	233	goto err_release;
	234	}
	235
	236	/* Done */
cf73120b	237	dev_set_drvdata(&edev->pdev->dev, edev);
fc8a9d83	238	return 1;
cc90ef0f DH	239
cc90ef0f DH	240	err_release:
cf73120b	241	pci_release_region(edev->pdev, 0);
cc90ef0f	242	err_disable:
cf73120b	243	pci_disable_device(edev->pdev);
811f9991	244	err_devput:
cc90ef0f DH	245	return 0;
	246	}
	247
cf73120b	248	static void esb_initdevice(struct esb_dev *edev)
fc8a9d83 WVS	249	{
	250	u8 val1;
	251	u16 val2;
	252
	253	/*
	254	* Config register:
	255	* Bit 5 : 0 = Enable WDT_OUTPUT
	256	* Bit 2 : 0 = set the timer frequency to the PCI clock
	257	* divided by 2^15 (approx 1KHz).
	258	* Bits 1:0 : 11 = WDT_INT_TYPE Disabled.
	259	* The watchdog has two timers, it can be setup so that the
	260	* expiry of timer1 results in an interrupt and the expiry of
	261	* timer2 results in a reboot. We set it to not generate
	262	* any interrupts as there is not much we can do with it
	263	* right now.
	264	*/
cf73120b	265	pci_write_config_word(edev->pdev, ESB_CONFIG_REG, 0x0003);
fc8a9d83 WVS	266
fc8a9d83 WVS	267	/* Check that the WDT isn't already locked */
cf73120b	268	pci_read_config_byte(edev->pdev, ESB_LOCK_REG, &val1);
fc8a9d83	269	if (val1 & ESB_WDT_LOCK)
cf73120b	270	dev_warn(&edev->pdev->dev, "nowayout already set\n");
fc8a9d83 WVS	271
fc8a9d83 WVS	272	/* Set the timer to watchdog mode and disable it for now */
cf73120b	273	pci_write_config_byte(edev->pdev, ESB_LOCK_REG, 0x00);
fc8a9d83 WVS	274
fc8a9d83 WVS	275	/* Check if the watchdog was previously triggered */
cf73120b RR	276	esb_unlock_registers(edev);
cf73120b RR	277	val2 = readw(ESB_RELOAD_REG(edev));
fc8a9d83	278	if (val2 & ESB_WDT_TIMEOUT)
cf73120b	279	edev->wdd.bootstatus = WDIOF_CARDRESET;
fc8a9d83 WVS	280
fc8a9d83 WVS	281	/* Reset WDT_TIMEOUT flag and timers */
cf73120b RR	282	esb_unlock_registers(edev);
cf73120b RR	283	writew((ESB_WDT_TIMEOUT \| ESB_WDT_RELOAD), ESB_RELOAD_REG(edev));
fc8a9d83 WVS	284
fc8a9d83 WVS	285	/* And set the correct timeout value */
cf73120b	286	esb_timer_set_heartbeat(&edev->wdd, edev->wdd.timeout);
fc8a9d83 WVS	287	}
fc8a9d83 WVS	288
2d991a16	289	static int esb_probe(struct pci_dev *pdev,
2786095a	290	const struct pci_device_id *ent)
cc90ef0f	291	{
cf73120b	292	struct esb_dev *edev;
0829291e AC	293	int ret;
0829291e AC	294
cf73120b RR	295	edev = devm_kzalloc(&pdev->dev, sizeof(*edev), GFP_KERNEL);
	296	if (!edev)
	297	return -ENOMEM;
2786095a	298
0829291e	299	/* Check whether or not the hardware watchdog is there */
cf73120b RR	300	edev->pdev = pdev;
cf73120b RR	301	if (!esb_getdevice(edev))
0829291e AC	302	return -ENODEV;
0829291e AC	303
fc8a9d83	304	/* Initialize the watchdog and make sure it does not run */
cf73120b RR	305	edev->wdd.info = &esb_info;
cf73120b RR	306	edev->wdd.ops = &esb_ops;
568d6015 RR	307	edev->wdd.min_timeout = ESB_HEARTBEAT_MIN;
	308	edev->wdd.max_timeout = ESB_HEARTBEAT_MAX;
	309	edev->wdd.timeout = ESB_HEARTBEAT_DEFAULT;
89bd0ed8	310	watchdog_init_timeout(&edev->wdd, heartbeat, NULL);
cf73120b RR	311	watchdog_set_nowayout(&edev->wdd, nowayout);
	312	watchdog_stop_on_reboot(&edev->wdd);
	313	watchdog_stop_on_unregister(&edev->wdd);
	314	esb_initdevice(edev);
fc8a9d83 WVS	315
fc8a9d83 WVS	316	/* Register the watchdog so that userspace has access to it */
cf73120b	317	ret = watchdog_register_device(&edev->wdd);
34b8580f	318	if (ret != 0)
0426fd0d	319	goto err_unmap;
7af4ac87	320	dev_info(&pdev->dev,
f6cc8b35 MC	321	"initialized. heartbeat=%d sec (nowayout=%d)\n",
f6cc8b35 MC	322	edev->wdd.timeout, nowayout);
0829291e	323	return 0;
cc90ef0f	324
cc90ef0f	325	err_unmap:
cf73120b RR	326	iounmap(edev->base);
	327	pci_release_region(edev->pdev, 0);
	328	pci_disable_device(edev->pdev);
0829291e	329	return ret;
cc90ef0f DH	330	}
cc90ef0f DH	331
4b12b896	332	static void esb_remove(struct pci_dev *pdev)
cc90ef0f	333	{
cf73120b RR	334	struct esb_dev *edev = dev_get_drvdata(&pdev->dev);
	335
	336	watchdog_unregister_device(&edev->wdd);
	337	iounmap(edev->base);
	338	pci_release_region(edev->pdev, 0);
	339	pci_disable_device(edev->pdev);
0426fd0d WVS	340	}
0426fd0d WVS	341
2786095a WVS	342	static struct pci_driver esb_driver = {
	343	.name = ESB_MODULE_NAME,
	344	.id_table = esb_pci_tbl,
0426fd0d	345	.probe = esb_probe,
82268714	346	.remove = esb_remove,
0426fd0d WVS	347	};
0426fd0d WVS	348
5ce9c371	349	module_pci_driver(esb_driver);
cc90ef0f	350
96de0e25	351	MODULE_AUTHOR("Ross Biro and David Härdeman");
cc90ef0f DH	352	MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets");
cc90ef0f DH	353	MODULE_LICENSE("GPL");