[linux-2.6-block.git] / drivers / watchdog / hpwdt.c

/*
 *	HPE WatchDog Driver
 *	based on
 *
 *	SoftDog	0.05:	A Software Watchdog Device
 *
 *	(c) Copyright 2018 Hewlett Packard Enterprise Development LP
 *	Thomas Mingarelli <thomas.mingarelli@hpe.com>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	version 2 as published by the Free Software Foundation
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <asm/nmi.h>

#define HPWDT_VERSION			"2.0.1"
#define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
#define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
#define DEFAULT_MARGIN			30
#define PRETIMEOUT_SEC			9

static bool ilo5;
static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
static bool nowayout = WATCHDOG_NOWAYOUT;
static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);

static void __iomem *pci_mem_addr;		/* the PCI-memory address */
static unsigned long __iomem *hpwdt_nmistat;
static unsigned long __iomem *hpwdt_timer_reg;
static unsigned long __iomem *hpwdt_timer_con;

static const struct pci_device_id hpwdt_devices[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },	/* iLO2 */
	{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },	/* iLO3 */
	{0},			/* terminate list */
};
MODULE_DEVICE_TABLE(pci, hpwdt_devices);


/*
 *	Watchdog operations
 */
static int hpwdt_start(struct watchdog_device *wdd)
{
	int control = 0x81 | (pretimeout ? 0x4 : 0);
	int reload = SECS_TO_TICKS(wdd->timeout);

	dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control);
	iowrite16(reload, hpwdt_timer_reg);
	iowrite8(control, hpwdt_timer_con);

	return 0;
}

static void hpwdt_stop(void)
{
	unsigned long data;

	pr_debug("stop  watchdog\n");

	data = ioread8(hpwdt_timer_con);
	data &= 0xFE;
	iowrite8(data, hpwdt_timer_con);
}

static int hpwdt_stop_core(struct watchdog_device *wdd)
{
	hpwdt_stop();

	return 0;
}

static int hpwdt_ping(struct watchdog_device *wdd)
{
	int reload = SECS_TO_TICKS(wdd->timeout);

	dev_dbg(wdd->parent, "ping  watchdog 0x%08x\n", reload);
	iowrite16(reload, hpwdt_timer_reg);

	return 0;
}

static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
{
	return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
}

static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
{
	dev_dbg(wdd->parent, "set_timeout = %d\n", val);

	wdd->timeout = val;
	if (val <= wdd->pretimeout) {
		dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
		wdd->pretimeout = 0;
		pretimeout = 0;
		if (watchdog_active(wdd))
			hpwdt_start(wdd);
	}
	hpwdt_ping(wdd);

	return 0;
}

#ifdef CONFIG_HPWDT_NMI_DECODING
static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
{
	unsigned int val = 0;

	dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
	if (req) {
		val = PRETIMEOUT_SEC;
		if (val >= wdd->timeout)
			return -EINVAL;
	}

	if (val != req)
		dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);

	wdd->pretimeout = val;
	pretimeout = !!val;

	if (watchdog_active(wdd))
		hpwdt_start(wdd);

	return 0;
}

static int hpwdt_my_nmi(void)
{
	return ioread8(hpwdt_nmistat) & 0x6;
}

/*
 *	NMI Handler
 */
static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
{
	unsigned int mynmi = hpwdt_my_nmi();
	static char panic_msg[] =
		"00: An NMI occurred. Depending on your system the reason "
		"for the NMI is logged in any one of the following resources:\n"
		"1. Integrated Management Log (IML)\n"
		"2. OA Syslog\n"
		"3. OA Forward Progress Log\n"
		"4. iLO Event Log";

	if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
		return NMI_DONE;

	if (ilo5 && !pretimeout && !mynmi)
		return NMI_DONE;

	hpwdt_stop();

	hex_byte_pack(panic_msg, mynmi);
	nmi_panic(regs, panic_msg);

	return NMI_HANDLED;
}
#endif /* CONFIG_HPWDT_NMI_DECODING */


static const struct watchdog_info ident = {
	.options = WDIOF_PRETIMEOUT    |
		   WDIOF_SETTIMEOUT    |
		   WDIOF_KEEPALIVEPING |
		   WDIOF_MAGICCLOSE,
	.identity = "HPE iLO2+ HW Watchdog Timer",
};

/*
 *	Kernel interfaces
 */

static const struct watchdog_ops hpwdt_ops = {
	.owner		= THIS_MODULE,
	.start		= hpwdt_start,
	.stop		= hpwdt_stop_core,
	.ping		= hpwdt_ping,
	.set_timeout	= hpwdt_settimeout,
	.get_timeleft	= hpwdt_gettimeleft,
#ifdef CONFIG_HPWDT_NMI_DECODING
	.set_pretimeout	= hpwdt_set_pretimeout,
#endif
};

static struct watchdog_device hpwdt_dev = {
	.info		= &ident,
	.ops		= &hpwdt_ops,
	.min_timeout	= 1,
	.max_timeout	= HPWDT_MAX_TIMER,
	.timeout	= DEFAULT_MARGIN,
	.pretimeout	= PRETIMEOUT_SEC,
};


/*
 *	Init & Exit
 */

static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
{
#ifdef CONFIG_HPWDT_NMI_DECODING
	int retval;
	/*
	 * Only one function can register for NMI_UNKNOWN
	 */
	retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
	if (retval)
		goto error;
	retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
	if (retval)
		goto error1;
	retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
	if (retval)
		goto error2;

	dev_info(&dev->dev,
		"HPE Watchdog Timer Driver: NMI decoding initialized\n");

	return 0;

error2:
	unregister_nmi_handler(NMI_SERR, "hpwdt");
error1:
	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
error:
	dev_warn(&dev->dev,
		"Unable to register a die notifier (err=%d).\n",
		retval);
	return retval;
#endif	/* CONFIG_HPWDT_NMI_DECODING */
	return 0;
}

static void hpwdt_exit_nmi_decoding(void)
{
#ifdef CONFIG_HPWDT_NMI_DECODING
	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
	unregister_nmi_handler(NMI_SERR, "hpwdt");
	unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
#endif
}

static int hpwdt_init_one(struct pci_dev *dev,
					const struct pci_device_id *ent)
{
	int retval;

	/*
	 * First let's find out if we are on an iLO2+ server. We will
	 * not run on a legacy ASM box.
	 * So we only support the G5 ProLiant servers and higher.
	 */
	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
	    dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
		dev_warn(&dev->dev,
			"This server does not have an iLO2+ ASIC.\n");
		return -ENODEV;
	}

	/*
	 * Ignore all auxilary iLO devices with the following PCI ID
	 */
	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
	    dev->subsystem_device == 0x1979)
		return -ENODEV;

	if (pci_enable_device(dev)) {
		dev_warn(&dev->dev,
			"Not possible to enable PCI Device: 0x%x:0x%x.\n",
			ent->vendor, ent->device);
		return -ENODEV;
	}

	pci_mem_addr = pci_iomap(dev, 1, 0x80);
	if (!pci_mem_addr) {
		dev_warn(&dev->dev,
			"Unable to detect the iLO2+ server memory.\n");
		retval = -ENOMEM;
		goto error_pci_iomap;
	}
	hpwdt_nmistat	= pci_mem_addr + 0x6e;
	hpwdt_timer_reg = pci_mem_addr + 0x70;
	hpwdt_timer_con = pci_mem_addr + 0x72;

	/* Make sure that timer is disabled until /dev/watchdog is opened */
	hpwdt_stop();

	/* Initialize NMI Decoding functionality */
	retval = hpwdt_init_nmi_decoding(dev);
	if (retval != 0)
		goto error_init_nmi_decoding;

	watchdog_set_nowayout(&hpwdt_dev, nowayout);
	if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL))
		dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin);

	if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
		dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
		pretimeout = 0;
	}
	hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;

	hpwdt_dev.parent = &dev->dev;
	retval = watchdog_register_device(&hpwdt_dev);
	if (retval < 0) {
		dev_err(&dev->dev, "watchdog register failed: %d.\n", retval);
		goto error_wd_register;
	}

	dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
				HPWDT_VERSION);
	dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
				hpwdt_dev.timeout, nowayout);
	dev_info(&dev->dev, "pretimeout: %s.\n",
				pretimeout ? "on" : "off");

	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
		ilo5 = true;

	return 0;

error_wd_register:
	hpwdt_exit_nmi_decoding();
error_init_nmi_decoding:
	pci_iounmap(dev, pci_mem_addr);
error_pci_iomap:
	pci_disable_device(dev);
	return retval;
}

static void hpwdt_exit(struct pci_dev *dev)
{
	if (!nowayout)
		hpwdt_stop();

	watchdog_unregister_device(&hpwdt_dev);
	hpwdt_exit_nmi_decoding();
	pci_iounmap(dev, pci_mem_addr);
	pci_disable_device(dev);
}

static struct pci_driver hpwdt_driver = {
	.name = "hpwdt",
	.id_table = hpwdt_devices,
	.probe = hpwdt_init_one,
	.remove = hpwdt_exit,
};

MODULE_AUTHOR("Tom Mingarelli");
MODULE_DESCRIPTION("hpe watchdog driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(HPWDT_VERSION);

module_param(soft_margin, int, 0);
MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");

module_param_named(timeout, soft_margin, int, 0);
MODULE_PARM_DESC(timeout, "Alias of soft_margin");

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

#ifdef CONFIG_HPWDT_NMI_DECODING
module_param(pretimeout, bool, 0);
MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
#endif

module_pci_driver(hpwdt_driver);
Commit	Line	Data
7f4da474	1	/*
ca22e79f	2	* HPE WatchDog Driver
7f4da474 TM	3	* based on
	4	*
	5	* SoftDog 0.05: A Software Watchdog Device
	6	*
9a46fc4e	7	* (c) Copyright 2018 Hewlett Packard Enterprise Development LP
ca22e79f	8	* Thomas Mingarelli <thomas.mingarelli@hpe.com>
7f4da474 TM	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* version 2 as published by the Free Software Foundation
	13	*
	14	*/
	15
27c766aa JP	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27c766aa JP	17
7f4da474	18	#include <linux/device.h>
7f4da474	19	#include <linux/io.h>
7f4da474	20	#include <linux/kernel.h>
7f4da474	21	#include <linux/module.h>
7f4da474	22	#include <linux/moduleparam.h>
7f4da474 TM	23	#include <linux/pci.h>
7f4da474 TM	24	#include <linux/pci_ids.h>
7f4da474	25	#include <linux/types.h>
7f4da474	26	#include <linux/watchdog.h>
d48b0e17	27	#include <asm/nmi.h>
7f4da474	28
e1c7f79e	29	#define HPWDT_VERSION "2.0.1"
e802e32d	30	#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
6f681c2e	31	#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
6f681c2e	32	#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
923410d0	33	#define DEFAULT_MARGIN 30
0458f403	34	#define PRETIMEOUT_SEC 9
923410d0	35
a6c24733	36	static bool ilo5;
923410d0	37	static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
86a1e189	38	static bool nowayout = WATCHDOG_NOWAYOUT;
0458f403	39	static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
923410d0	40
923410d0	41	static void __iomem pci_mem_addr; / the PCI-memory address */
838534e5	42	static unsigned long __iomem *hpwdt_nmistat;
923410d0	43	static unsigned long __iomem *hpwdt_timer_reg;
	44	static unsigned long __iomem *hpwdt_timer_con;
	45
bc17f9dc	46	static const struct pci_device_id hpwdt_devices[] = {
36e3ff44	47	{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
36e3ff44	48	{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
923410d0	49	{0}, /* terminate list */
	50	};
	51	MODULE_DEVICE_TABLE(pci, hpwdt_devices);
	52
7f4da474	53
7f4da474 TM	54	/*
	55	* Watchdog operations
	56	*/
d0a4027f	57	static int hpwdt_start(struct watchdog_device *wdd)
7f4da474	58	{
0458f403 JH	59	int control = 0x81 \| (pretimeout ? 0x4 : 0);
0458f403 JH	60	int reload = SECS_TO_TICKS(wdd->timeout);
d0a4027f	61
ccfd6921	62	dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control);
7f4da474	63	iowrite16(reload, hpwdt_timer_reg);
0458f403	64	iowrite8(control, hpwdt_timer_con);
d0a4027f JH	65
d0a4027f JH	66	return 0;
7f4da474 TM	67	}
	68
	69	static void hpwdt_stop(void)
	70	{
	71	unsigned long data;
	72
ccfd6921 JH	73	pr_debug("stop watchdog\n");
ccfd6921 JH	74
d08c9a33	75	data = ioread8(hpwdt_timer_con);
7f4da474	76	data &= 0xFE;
d08c9a33	77	iowrite8(data, hpwdt_timer_con);
7f4da474 TM	78	}
7f4da474 TM	79
d0a4027f	80	static int hpwdt_stop_core(struct watchdog_device *wdd)
7f4da474	81	{
d0a4027f JH	82	hpwdt_stop();
	83
	84	return 0;
7f4da474 TM	85	}
7f4da474 TM	86
d0a4027f	87	static int hpwdt_ping(struct watchdog_device *wdd)
7f4da474	88	{
0458f403 JH	89	int reload = SECS_TO_TICKS(wdd->timeout);
0458f403 JH	90
ccfd6921	91	dev_dbg(wdd->parent, "ping watchdog 0x%08x\n", reload);
d0a4027f	92	iowrite16(reload, hpwdt_timer_reg);
0458f403	93
7f4da474 TM	94	return 0;
	95	}
	96
d0a4027f	97	static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
aae67f36	98	{
	99	return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
	100	}
	101
d0a4027f JH	102	static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
d0a4027f JH	103	{
ccfd6921 JH	104	dev_dbg(wdd->parent, "set_timeout = %d\n", val);
ccfd6921 JH	105
d0a4027f	106	wdd->timeout = val;
0458f403	107	if (val <= wdd->pretimeout) {
ccfd6921	108	dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
0458f403 JH	109	wdd->pretimeout = 0;
	110	pretimeout = 0;
	111	if (watchdog_active(wdd))
	112	hpwdt_start(wdd);
	113	}
d0a4027f JH	114	hpwdt_ping(wdd);
	115
	116	return 0;
	117	}
	118
aeebc6ba	119	#ifdef CONFIG_HPWDT_NMI_DECODING
0458f403 JH	120	static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
	121	{
	122	unsigned int val = 0;
	123
ccfd6921	124	dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
0458f403 JH	125	if (req) {
	126	val = PRETIMEOUT_SEC;
	127	if (val >= wdd->timeout)
	128	return -EINVAL;
	129	}
	130
ccfd6921 JH	131	if (val != req)
	132	dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);
	133
0458f403 JH	134	wdd->pretimeout = val;
	135	pretimeout = !!val;
	136
	137	if (watchdog_active(wdd))
	138	hpwdt_start(wdd);
	139
	140	return 0;
	141	}
	142
838534e5 JH	143	static int hpwdt_my_nmi(void)
	144	{
	145	return ioread8(hpwdt_nmistat) & 0x6;
	146	}
	147
ab4ba3cd TM	148	/*
	149	* NMI Handler
	150	*/
9c48f1c6	151	static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
ab4ba3cd	152	{
a042229a JH	153	unsigned int mynmi = hpwdt_my_nmi();
	154	static char panic_msg[] =
	155	"00: An NMI occurred. Depending on your system the reason "
	156	"for the NMI is logged in any one of the following resources:\n"
	157	"1. Integrated Management Log (IML)\n"
	158	"2. OA Syslog\n"
	159	"3. OA Forward Progress Log\n"
	160	"4. iLO Event Log";
	161
62290a5c	162	if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
838534e5 JH	163	return NMI_DONE;
838534e5 JH	164
093d4385	165	if (ilo5 && !pretimeout && !mynmi)
0458f403 JH	166	return NMI_DONE;
0458f403 JH	167
703fc3df	168	hpwdt_stop();
dbc018ec	169
a042229a JH	170	hex_byte_pack(panic_msg, mynmi);
a042229a JH	171	nmi_panic(regs, panic_msg);
5efc7a62	172
abc514c5	173	return NMI_HANDLED;
ab4ba3cd	174	}
86ded1f3	175	#endif /* CONFIG_HPWDT_NMI_DECODING */
ab4ba3cd	176
7f4da474	177
42747d71	178	static const struct watchdog_info ident = {
0458f403 JH	179	.options = WDIOF_PRETIMEOUT \|
0458f403 JH	180	WDIOF_SETTIMEOUT \|
7f4da474 TM	181	WDIOF_KEEPALIVEPING \|
7f4da474 TM	182	WDIOF_MAGICCLOSE,
ca22e79f	183	.identity = "HPE iLO2+ HW Watchdog Timer",
7f4da474 TM	184	};
7f4da474 TM	185
7f4da474 TM	186	/*
	187	* Kernel interfaces
	188	*/
d0a4027f JH	189
	190	static const struct watchdog_ops hpwdt_ops = {
	191	.owner = THIS_MODULE,
	192	.start = hpwdt_start,
	193	.stop = hpwdt_stop_core,
	194	.ping = hpwdt_ping,
	195	.set_timeout = hpwdt_settimeout,
	196	.get_timeleft = hpwdt_gettimeleft,
0458f403 JH	197	#ifdef CONFIG_HPWDT_NMI_DECODING
	198	.set_pretimeout = hpwdt_set_pretimeout,
	199	#endif
7f4da474 TM	200	};
7f4da474 TM	201
d0a4027f JH	202	static struct watchdog_device hpwdt_dev = {
	203	.info = &ident,
	204	.ops = &hpwdt_ops,
	205	.min_timeout = 1,
	206	.max_timeout = HPWDT_MAX_TIMER,
	207	.timeout = DEFAULT_MARGIN,
0458f403	208	.pretimeout = PRETIMEOUT_SEC,
7f4da474 TM	209	};
7f4da474 TM	210
d0a4027f	211
7f4da474 TM	212	/*
	213	* Init & Exit
	214	*/
	215
2d991a16	216	static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
2ec7ed67	217	{
2b3d89b4	218	#ifdef CONFIG_HPWDT_NMI_DECODING
2ec7ed67	219	int retval;
2ec7ed67	220	/*
09ee1014	221	* Only one function can register for NMI_UNKNOWN
2ec7ed67	222	*/
09ee1014	223	retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
553222f3 DZ	224	if (retval)
	225	goto error;
	226	retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
	227	if (retval)
	228	goto error1;
	229	retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
	230	if (retval)
	231	goto error2;
2ec7ed67	232
2ec7ed67	233	dev_info(&dev->dev,
703fc3df JH	234	"HPE Watchdog Timer Driver: NMI decoding initialized\n");
703fc3df JH	235
2ec7ed67	236	return 0;
553222f3 DZ	237
	238	error2:
	239	unregister_nmi_handler(NMI_SERR, "hpwdt");
	240	error1:
	241	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
	242	error:
	243	dev_warn(&dev->dev,
	244	"Unable to register a die notifier (err=%d).\n",
	245	retval);
553222f3	246	return retval;
2b3d89b4 JH	247	#endif /* CONFIG_HPWDT_NMI_DECODING */
2b3d89b4 JH	248	return 0;
2ec7ed67	249	}
2ec7ed67	250
b77b7088	251	static void hpwdt_exit_nmi_decoding(void)
2ec7ed67	252	{
2b3d89b4	253	#ifdef CONFIG_HPWDT_NMI_DECODING
9c48f1c6	254	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
a089361c MT	255	unregister_nmi_handler(NMI_SERR, "hpwdt");
a089361c MT	256	unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
2b3d89b4	257	#endif
86ded1f3	258	}
86ded1f3	259
2d991a16	260	static int hpwdt_init_one(struct pci_dev *dev,
ab4ba3cd	261	const struct pci_device_id *ent)
7f4da474 TM	262	{
	263	int retval;
	264
	265	/*
36e3ff44	266	* First let's find out if we are on an iLO2+ server. We will
7f4da474	267	* not run on a legacy ASM box.
ab4ba3cd	268	* So we only support the G5 ProLiant servers and higher.
7f4da474	269	*/
fc113d54 BB	270	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
fc113d54 BB	271	dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
7f4da474	272	dev_warn(&dev->dev,
36e3ff44	273	"This server does not have an iLO2+ ASIC.\n");
7f4da474 TM	274	return -ENODEV;
	275	}
	276
0821f20d MT	277	/*
	278	* Ignore all auxilary iLO devices with the following PCI ID
	279	*/
fc113d54 BB	280	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
fc113d54 BB	281	dev->subsystem_device == 0x1979)
0821f20d MT	282	return -ENODEV;
0821f20d MT	283
7f4da474 TM	284	if (pci_enable_device(dev)) {
	285	dev_warn(&dev->dev,
	286	"Not possible to enable PCI Device: 0x%x:0x%x.\n",
	287	ent->vendor, ent->device);
	288	return -ENODEV;
	289	}
	290
	291	pci_mem_addr = pci_iomap(dev, 1, 0x80);
	292	if (!pci_mem_addr) {
	293	dev_warn(&dev->dev,
36e3ff44	294	"Unable to detect the iLO2+ server memory.\n");
7f4da474 TM	295	retval = -ENOMEM;
	296	goto error_pci_iomap;
	297	}
838534e5	298	hpwdt_nmistat = pci_mem_addr + 0x6e;
7f4da474 TM	299	hpwdt_timer_reg = pci_mem_addr + 0x70;
	300	hpwdt_timer_con = pci_mem_addr + 0x72;
	301
308b135e TK	302	/* Make sure that timer is disabled until /dev/watchdog is opened */
	303	hpwdt_stop();
	304
2ec7ed67	305	/* Initialize NMI Decoding functionality */
	306	retval = hpwdt_init_nmi_decoding(dev);
	307	if (retval != 0)
	308	goto error_init_nmi_decoding;
7f4da474	309
d0a4027f JH	310	watchdog_set_nowayout(&hpwdt_dev, nowayout);
	311	if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL))
	312	dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin);
	313
10d790d1 JH	314	if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
	315	dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
	316	pretimeout = 0;
	317	}
4d9186d0 JH	318	hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
4d9186d0 JH	319
d0a4027f JH	320	hpwdt_dev.parent = &dev->dev;
d0a4027f JH	321	retval = watchdog_register_device(&hpwdt_dev);
7f4da474	322	if (retval < 0) {
d0a4027f JH	323	dev_err(&dev->dev, "watchdog register failed: %d.\n", retval);
d0a4027f JH	324	goto error_wd_register;
7f4da474 TM	325	}
7f4da474 TM	326
92301461 JH	327	dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
	328	HPWDT_VERSION);
	329	dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
	330	hpwdt_dev.timeout, nowayout);
	331	dev_info(&dev->dev, "pretimeout: %s.\n",
	332	pretimeout ? "on" : "off");
d0a4027f	333
a6c24733 JH	334	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
	335	ilo5 = true;
	336
7f4da474 TM	337	return 0;
7f4da474 TM	338
d0a4027f	339	error_wd_register:
2ec7ed67	340	hpwdt_exit_nmi_decoding();
2ec7ed67	341	error_init_nmi_decoding:
7f4da474 TM	342	pci_iounmap(dev, pci_mem_addr);
	343	error_pci_iomap:
	344	pci_disable_device(dev);
	345	return retval;
	346	}
	347
4b12b896	348	static void hpwdt_exit(struct pci_dev *dev)
7f4da474 TM	349	{
	350	if (!nowayout)
	351	hpwdt_stop();
	352
d0a4027f	353	watchdog_unregister_device(&hpwdt_dev);
2ec7ed67	354	hpwdt_exit_nmi_decoding();
7f4da474 TM	355	pci_iounmap(dev, pci_mem_addr);
	356	pci_disable_device(dev);
	357	}
	358
	359	static struct pci_driver hpwdt_driver = {
	360	.name = "hpwdt",
	361	.id_table = hpwdt_devices,
	362	.probe = hpwdt_init_one,
82268714	363	.remove = hpwdt_exit,
7f4da474 TM	364	};
7f4da474 TM	365
7f4da474	366	MODULE_AUTHOR("Tom Mingarelli");
9a46fc4e	367	MODULE_DESCRIPTION("hpe watchdog driver");
7f4da474	368	MODULE_LICENSE("GPL");
d8100c3a	369	MODULE_VERSION(HPWDT_VERSION);
7f4da474 TM	370
	371	module_param(soft_margin, int, 0);
	372	MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
	373
397a35d4 JH	374	module_param_named(timeout, soft_margin, int, 0);
	375	MODULE_PARM_DESC(timeout, "Alias of soft_margin");
	376
86a1e189	377	module_param(nowayout, bool, 0);
7f4da474 TM	378	MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	379	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
	380
0458f403 JH	381	#ifdef CONFIG_HPWDT_NMI_DECODING
	382	module_param(pretimeout, bool, 0);
	383	MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
	384	#endif
	385
5ce9c371	386	module_pci_driver(hpwdt_driver);