1/*
  2 *	HP WatchDog Driver
  3 *	based on
  4 *
  5 *	SoftDog	0.05:	A Software Watchdog Device
  6 *
  7 *	(c) Copyright 2007 Hewlett-Packard Development Company, L.P.
  8 *	Thomas Mingarelli <thomas.mingarelli@hp.com>
  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
 
 
 16#include <linux/device.h>
 17#include <linux/fs.h>
 18#include <linux/init.h>
 19#include <linux/io.h>
 20#include <linux/bitops.h>
 21#include <linux/kernel.h>
 22#include <linux/miscdevice.h>
 23#include <linux/module.h>
 24#include <linux/moduleparam.h>
 25#include <linux/pci.h>
 26#include <linux/pci_ids.h>
 27#include <linux/types.h>
 28#include <linux/uaccess.h>
 29#include <linux/watchdog.h>
 30#ifdef CONFIG_HPWDT_NMI_DECODING
 31#include <linux/dmi.h>
 32#include <linux/spinlock.h>
 33#include <linux/nmi.h>
 34#include <linux/kdebug.h>
 35#include <linux/notifier.h>
 36#include <asm/cacheflush.h>
 37#endif /* CONFIG_HPWDT_NMI_DECODING */
 38
 39#define HPWDT_VERSION			"1.3.0"
 40#define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
 41#define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
 42#define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
 43#define DEFAULT_MARGIN			30
 
 44
 
 45static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
 46static unsigned int reload;			/* the computed soft_margin */
 47static int nowayout = WATCHDOG_NOWAYOUT;
 48static char expect_release;
 49static unsigned long hpwdt_is_open;
 50
 51static void __iomem *pci_mem_addr;		/* the PCI-memory address */
 
 52static unsigned long __iomem *hpwdt_timer_reg;
 53static unsigned long __iomem *hpwdt_timer_con;
 54
 55static DEFINE_PCI_DEVICE_TABLE(hpwdt_devices) = {
 56	{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },	/* iLO2 */
 57	{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },	/* iLO3 */
 58	{0},			/* terminate list */
 59};
 60MODULE_DEVICE_TABLE(pci, hpwdt_devices);
 61
 62#ifdef CONFIG_HPWDT_NMI_DECODING
 63#define PCI_BIOS32_SD_VALUE		0x5F32335F	/* "_32_" */
 64#define CRU_BIOS_SIGNATURE_VALUE	0x55524324
 65#define PCI_BIOS32_PARAGRAPH_LEN	16
 66#define PCI_ROM_BASE1			0x000F0000
 67#define ROM_SIZE			0x10000
 68
 69struct bios32_service_dir {
 70	u32 signature;
 71	u32 entry_point;
 72	u8 revision;
 73	u8 length;
 74	u8 checksum;
 75	u8 reserved[5];
 76};
 77
 78/* type 212 */
 79struct smbios_cru64_info {
 80	u8 type;
 81	u8 byte_length;
 82	u16 handle;
 83	u32 signature;
 84	u64 physical_address;
 85	u32 double_length;
 86	u32 double_offset;
 87};
 88#define SMBIOS_CRU64_INFORMATION	212
 89
 90/* type 219 */
 91struct smbios_proliant_info {
 92	u8 type;
 93	u8 byte_length;
 94	u16 handle;
 95	u32 power_features;
 96	u32 omega_features;
 97	u32 reserved;
 98	u32 misc_features;
 99};
100#define SMBIOS_ICRU_INFORMATION		219
101
102
103struct cmn_registers {
104	union {
105		struct {
106			u8 ral;
107			u8 rah;
108			u16 rea2;
109		};
110		u32 reax;
111	} u1;
112	union {
113		struct {
114			u8 rbl;
115			u8 rbh;
116			u8 reb2l;
117			u8 reb2h;
118		};
119		u32 rebx;
120	} u2;
121	union {
122		struct {
123			u8 rcl;
124			u8 rch;
125			u16 rec2;
126		};
127		u32 recx;
128	} u3;
129	union {
130		struct {
131			u8 rdl;
132			u8 rdh;
133			u16 red2;
134		};
135		u32 redx;
136	} u4;
137
138	u32 resi;
139	u32 redi;
140	u16 rds;
141	u16 res;
142	u32 reflags;
143}  __attribute__((packed));
144
145static unsigned int hpwdt_nmi_decoding;
146static unsigned int allow_kdump;
147static unsigned int priority;		/* hpwdt at end of die_notify list */
148static unsigned int is_icru;
149static DEFINE_SPINLOCK(rom_lock);
150static void *cru_rom_addr;
151static struct cmn_registers cmn_regs;
152
153extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
154						unsigned long *pRomEntry);
155
156#ifdef CONFIG_X86_32
157/* --32 Bit Bios------------------------------------------------------------ */
158
159#define HPWDT_ARCH	32
160
161asm(".text                          \n\t"
162    ".align 4                       \n"
163    "asminline_call:                \n\t"
164    "pushl       %ebp               \n\t"
165    "movl        %esp, %ebp         \n\t"
166    "pusha                          \n\t"
167    "pushf                          \n\t"
168    "push        %es                \n\t"
169    "push        %ds                \n\t"
170    "pop         %es                \n\t"
171    "movl        8(%ebp),%eax       \n\t"
172    "movl        4(%eax),%ebx       \n\t"
173    "movl        8(%eax),%ecx       \n\t"
174    "movl        12(%eax),%edx      \n\t"
175    "movl        16(%eax),%esi      \n\t"
176    "movl        20(%eax),%edi      \n\t"
177    "movl        (%eax),%eax        \n\t"
178    "push        %cs                \n\t"
179    "call        *12(%ebp)          \n\t"
180    "pushf                          \n\t"
181    "pushl       %eax               \n\t"
182    "movl        8(%ebp),%eax       \n\t"
183    "movl        %ebx,4(%eax)       \n\t"
184    "movl        %ecx,8(%eax)       \n\t"
185    "movl        %edx,12(%eax)      \n\t"
186    "movl        %esi,16(%eax)      \n\t"
187    "movl        %edi,20(%eax)      \n\t"
188    "movw        %ds,24(%eax)       \n\t"
189    "movw        %es,26(%eax)       \n\t"
190    "popl        %ebx               \n\t"
191    "movl        %ebx,(%eax)        \n\t"
192    "popl        %ebx               \n\t"
193    "movl        %ebx,28(%eax)      \n\t"
194    "pop         %es                \n\t"
195    "popf                           \n\t"
196    "popa                           \n\t"
197    "leave                          \n\t"
198    "ret                            \n\t"
199    ".previous");
200
201
202/*
203 *	cru_detect
204 *
205 *	Routine Description:
206 *	This function uses the 32-bit BIOS Service Directory record to
207 *	search for a $CRU record.
208 *
209 *	Return Value:
210 *	0        :  SUCCESS
211 *	<0       :  FAILURE
212 */
213static int __devinit cru_detect(unsigned long map_entry,
214	unsigned long map_offset)
215{
216	void *bios32_map;
217	unsigned long *bios32_entrypoint;
218	unsigned long cru_physical_address;
219	unsigned long cru_length;
220	unsigned long physical_bios_base = 0;
221	unsigned long physical_bios_offset = 0;
222	int retval = -ENODEV;
223
224	bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
225
226	if (bios32_map == NULL)
227		return -ENODEV;
228
229	bios32_entrypoint = bios32_map + map_offset;
230
231	cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
232
233	asminline_call(&cmn_regs, bios32_entrypoint);
234
235	if (cmn_regs.u1.ral != 0) {
236		printk(KERN_WARNING
237			"hpwdt: Call succeeded but with an error: 0x%x\n",
238			cmn_regs.u1.ral);
239	} else {
240		physical_bios_base = cmn_regs.u2.rebx;
241		physical_bios_offset = cmn_regs.u4.redx;
242		cru_length = cmn_regs.u3.recx;
243		cru_physical_address =
244			physical_bios_base + physical_bios_offset;
245
246		/* If the values look OK, then map it in. */
247		if ((physical_bios_base + physical_bios_offset)) {
248			cru_rom_addr =
249				ioremap(cru_physical_address, cru_length);
250			if (cru_rom_addr)
251				retval = 0;
252		}
253
254		printk(KERN_DEBUG "hpwdt: CRU Base Address:   0x%lx\n",
255			physical_bios_base);
256		printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
257			physical_bios_offset);
258		printk(KERN_DEBUG "hpwdt: CRU Length:         0x%lx\n",
259			cru_length);
260		printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
261			&cru_rom_addr);
262	}
263	iounmap(bios32_map);
264	return retval;
265}
266
267/*
268 *	bios_checksum
269 */
270static int __devinit bios_checksum(const char __iomem *ptr, int len)
271{
272	char sum = 0;
273	int i;
274
275	/*
276	 * calculate checksum of size bytes. This should add up
277	 * to zero if we have a valid header.
278	 */
279	for (i = 0; i < len; i++)
280		sum += ptr[i];
281
282	return ((sum == 0) && (len > 0));
 
 
283}
284
285/*
286 *	bios32_present
287 *
288 *	Routine Description:
289 *	This function finds the 32-bit BIOS Service Directory
290 *
291 *	Return Value:
292 *	0        :  SUCCESS
293 *	<0       :  FAILURE
294 */
295static int __devinit bios32_present(const char __iomem *p)
296{
297	struct bios32_service_dir *bios_32_ptr;
298	int length;
299	unsigned long map_entry, map_offset;
300
301	bios_32_ptr = (struct bios32_service_dir *) p;
302
303	/*
304	 * Search for signature by checking equal to the swizzled value
305	 * instead of calling another routine to perform a strcmp.
306	 */
307	if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
308		length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
309		if (bios_checksum(p, length)) {
310			/*
311			 * According to the spec, we're looking for the
312			 * first 4KB-aligned address below the entrypoint
313			 * listed in the header. The Service Directory code
314			 * is guaranteed to occupy no more than 2 4KB pages.
315			 */
316			map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
317			map_offset = bios_32_ptr->entry_point - map_entry;
318
319			return cru_detect(map_entry, map_offset);
320		}
321	}
322	return -ENODEV;
323}
324
325static int __devinit detect_cru_service(void)
326{
327	char __iomem *p, *q;
328	int rc = -1;
329
330	/*
331	 * Search from 0x0f0000 through 0x0fffff, inclusive.
332	 */
333	p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
334	if (p == NULL)
335		return -ENOMEM;
336
337	for (q = p; q < p + ROM_SIZE; q += 16) {
338		rc = bios32_present(q);
339		if (!rc)
340			break;
341	}
342	iounmap(p);
343	return rc;
344}
345/* ------------------------------------------------------------------------- */
346#endif /* CONFIG_X86_32 */
347#ifdef CONFIG_X86_64
348/* --64 Bit Bios------------------------------------------------------------ */
349
350#define HPWDT_ARCH	64
351
352asm(".text                      \n\t"
353    ".align 4                   \n"
354    "asminline_call:            \n\t"
355    "pushq      %rbp            \n\t"
356    "movq       %rsp, %rbp      \n\t"
357    "pushq      %rax            \n\t"
358    "pushq      %rbx            \n\t"
359    "pushq      %rdx            \n\t"
360    "pushq      %r12            \n\t"
361    "pushq      %r9             \n\t"
362    "movq       %rsi, %r12      \n\t"
363    "movq       %rdi, %r9       \n\t"
364    "movl       4(%r9),%ebx     \n\t"
365    "movl       8(%r9),%ecx     \n\t"
366    "movl       12(%r9),%edx    \n\t"
367    "movl       16(%r9),%esi    \n\t"
368    "movl       20(%r9),%edi    \n\t"
369    "movl       (%r9),%eax      \n\t"
370    "call       *%r12           \n\t"
371    "pushfq                     \n\t"
372    "popq        %r12           \n\t"
373    "movl       %eax, (%r9)     \n\t"
374    "movl       %ebx, 4(%r9)    \n\t"
375    "movl       %ecx, 8(%r9)    \n\t"
376    "movl       %edx, 12(%r9)   \n\t"
377    "movl       %esi, 16(%r9)   \n\t"
378    "movl       %edi, 20(%r9)   \n\t"
379    "movq       %r12, %rax      \n\t"
380    "movl       %eax, 28(%r9)   \n\t"
381    "popq       %r9             \n\t"
382    "popq       %r12            \n\t"
383    "popq       %rdx            \n\t"
384    "popq       %rbx            \n\t"
385    "popq       %rax            \n\t"
386    "leave                      \n\t"
387    "ret                        \n\t"
388    ".previous");
389
390/*
391 *	dmi_find_cru
392 *
393 *	Routine Description:
394 *	This function checks whether or not a SMBIOS/DMI record is
395 *	the 64bit CRU info or not
396 */
397static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
398{
399	struct smbios_cru64_info *smbios_cru64_ptr;
400	unsigned long cru_physical_address;
401
402	if (dm->type == SMBIOS_CRU64_INFORMATION) {
403		smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
404		if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
405			cru_physical_address =
406				smbios_cru64_ptr->physical_address +
407				smbios_cru64_ptr->double_offset;
408			cru_rom_addr = ioremap(cru_physical_address,
409				smbios_cru64_ptr->double_length);
410			set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
411				smbios_cru64_ptr->double_length >> PAGE_SHIFT);
412		}
413	}
414}
415
416static int __devinit detect_cru_service(void)
417{
418	cru_rom_addr = NULL;
419
420	dmi_walk(dmi_find_cru, NULL);
421
422	/* if cru_rom_addr has been set then we found a CRU service */
423	return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
424}
425/* ------------------------------------------------------------------------- */
426#endif /* CONFIG_X86_64 */
427#endif /* CONFIG_HPWDT_NMI_DECODING */
428
429/*
430 *	Watchdog operations
431 */
432static void hpwdt_start(void)
433{
434	reload = SECS_TO_TICKS(soft_margin);
435	iowrite16(reload, hpwdt_timer_reg);
436	iowrite16(0x85, hpwdt_timer_con);
437}
438
439static void hpwdt_stop(void)
440{
441	unsigned long data;
 
 
 
 
 
 
442
443	data = ioread16(hpwdt_timer_con);
444	data &= 0xFE;
445	iowrite16(data, hpwdt_timer_con);
446}
447
448static void hpwdt_ping(void)
 
449{
450	iowrite16(reload, hpwdt_timer_reg);
451}
452
453static int hpwdt_change_timer(int new_margin)
454{
455	if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
456		printk(KERN_WARNING
457			"hpwdt: New value passed in is invalid: %d seconds.\n",
458			new_margin);
459		return -EINVAL;
460	}
461
462	soft_margin = new_margin;
463	printk(KERN_DEBUG
464		"hpwdt: New timer passed in is %d seconds.\n",
465		new_margin);
466	reload = SECS_TO_TICKS(soft_margin);
 
 
 
467
468	return 0;
469}
470
471static int hpwdt_time_left(void)
472{
473	return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
474}
475
476#ifdef CONFIG_HPWDT_NMI_DECODING
477/*
478 *	NMI Handler
479 */
480static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
481				void *data)
482{
483	unsigned long rom_pl;
484	static int die_nmi_called;
485
486	if (ulReason != DIE_NMIUNKNOWN)
487		goto out;
 
 
 
488
489	if (!hpwdt_nmi_decoding)
490		goto out;
491
492	spin_lock_irqsave(&rom_lock, rom_pl);
493	if (!die_nmi_called && !is_icru)
494		asminline_call(&cmn_regs, cru_rom_addr);
495	die_nmi_called = 1;
496	spin_unlock_irqrestore(&rom_lock, rom_pl);
497
498	if (allow_kdump)
499		hpwdt_stop();
500
501	if (!is_icru) {
502		if (cmn_regs.u1.ral == 0) {
503			panic("An NMI occurred, "
504				"but unable to determine source.\n");
505		}
506	}
507	panic("An NMI occurred, please see the Integrated "
508		"Management Log for details.\n");
509
510out:
511	return NOTIFY_OK;
512}
513#endif /* CONFIG_HPWDT_NMI_DECODING */
514
515/*
516 *	/dev/watchdog handling
517 */
518static int hpwdt_open(struct inode *inode, struct file *file)
519{
520	/* /dev/watchdog can only be opened once */
521	if (test_and_set_bit(0, &hpwdt_is_open))
522		return -EBUSY;
523
524	/* Start the watchdog */
525	hpwdt_start();
526	hpwdt_ping();
527
528	return nonseekable_open(inode, file);
529}
530
531static int hpwdt_release(struct inode *inode, struct file *file)
532{
533	/* Stop the watchdog */
534	if (expect_release == 42) {
535		hpwdt_stop();
536	} else {
537		printk(KERN_CRIT
538			"hpwdt: Unexpected close, not stopping watchdog!\n");
539		hpwdt_ping();
540	}
541
542	expect_release = 0;
543
544	/* /dev/watchdog is being closed, make sure it can be re-opened */
545	clear_bit(0, &hpwdt_is_open);
546
547	return 0;
548}
549
550static ssize_t hpwdt_write(struct file *file, const char __user *data,
551	size_t len, loff_t *ppos)
552{
553	/* See if we got the magic character 'V' and reload the timer */
554	if (len) {
555		if (!nowayout) {
556			size_t i;
557
558			/* note: just in case someone wrote the magic character
559			 * five months ago... */
560			expect_release = 0;
561
562			/* scan to see whether or not we got the magic char. */
563			for (i = 0; i != len; i++) {
564				char c;
565				if (get_user(c, data + i))
566					return -EFAULT;
567				if (c == 'V')
568					expect_release = 42;
569			}
570		}
571
572		/* someone wrote to us, we should reload the timer */
573		hpwdt_ping();
574	}
575
576	return len;
577}
578
579static const struct watchdog_info ident = {
580	.options = WDIOF_SETTIMEOUT |
 
581		   WDIOF_KEEPALIVEPING |
582		   WDIOF_MAGICCLOSE,
583	.identity = "HP iLO2+ HW Watchdog Timer",
584};
585
586static long hpwdt_ioctl(struct file *file, unsigned int cmd,
587	unsigned long arg)
588{
589	void __user *argp = (void __user *)arg;
590	int __user *p = argp;
591	int new_margin;
592	int ret = -ENOTTY;
593
594	switch (cmd) {
595	case WDIOC_GETSUPPORT:
596		ret = 0;
597		if (copy_to_user(argp, &ident, sizeof(ident)))
598			ret = -EFAULT;
599		break;
600
601	case WDIOC_GETSTATUS:
602	case WDIOC_GETBOOTSTATUS:
603		ret = put_user(0, p);
604		break;
605
606	case WDIOC_KEEPALIVE:
607		hpwdt_ping();
608		ret = 0;
609		break;
610
611	case WDIOC_SETTIMEOUT:
612		ret = get_user(new_margin, p);
613		if (ret)
614			break;
615
616		ret = hpwdt_change_timer(new_margin);
617		if (ret)
618			break;
619
620		hpwdt_ping();
621		/* Fall */
622	case WDIOC_GETTIMEOUT:
623		ret = put_user(soft_margin, p);
624		break;
625
626	case WDIOC_GETTIMELEFT:
627		ret = put_user(hpwdt_time_left(), p);
628		break;
629	}
630	return ret;
631}
632
633/*
634 *	Kernel interfaces
635 */
636static const struct file_operations hpwdt_fops = {
637	.owner = THIS_MODULE,
638	.llseek = no_llseek,
639	.write = hpwdt_write,
640	.unlocked_ioctl = hpwdt_ioctl,
641	.open = hpwdt_open,
642	.release = hpwdt_release,
643};
644
645static struct miscdevice hpwdt_miscdev = {
646	.minor = WATCHDOG_MINOR,
647	.name = "watchdog",
648	.fops = &hpwdt_fops,
 
 
 
 
 
 
649};
650
 
 
 
 
 
 
651#ifdef CONFIG_HPWDT_NMI_DECODING
652static struct notifier_block die_notifier = {
653	.notifier_call = hpwdt_pretimeout,
654	.priority = 0,
655};
656#endif /* CONFIG_HPWDT_NMI_DECODING */
657
658/*
659 *	Init & Exit
660 */
661
662#ifdef CONFIG_HPWDT_NMI_DECODING
663#ifdef CONFIG_X86_LOCAL_APIC
664static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
665{
666	/*
667	 * If nmi_watchdog is turned off then we can turn on
668	 * our nmi decoding capability.
669	 */
670	hpwdt_nmi_decoding = 1;
671}
672#else
673static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
674{
675	dev_warn(&dev->dev, "NMI decoding is disabled. "
676		"Your kernel does not support a NMI Watchdog.\n");
677}
678#endif /* CONFIG_X86_LOCAL_APIC */
679
680/*
681 *	dmi_find_icru
682 *
683 *	Routine Description:
684 *	This function checks whether or not we are on an iCRU-based server.
685 *	This check is independent of architecture and needs to be made for
686 *	any ProLiant system.
687 */
688static void __devinit dmi_find_icru(const struct dmi_header *dm, void *dummy)
689{
690	struct smbios_proliant_info *smbios_proliant_ptr;
691
692	if (dm->type == SMBIOS_ICRU_INFORMATION) {
693		smbios_proliant_ptr = (struct smbios_proliant_info *) dm;
694		if (smbios_proliant_ptr->misc_features & 0x01)
695			is_icru = 1;
696	}
697}
698
699static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
700{
 
701	int retval;
702
703	/*
704	 * On typical CRU-based systems we need to map that service in
705	 * the BIOS. For 32 bit Operating Systems we need to go through
706	 * the 32 Bit BIOS Service Directory. For 64 bit Operating
707	 * Systems we get that service through SMBIOS.
708	 *
709	 * On systems that support the new iCRU service all we need to
710	 * do is call dmi_walk to get the supported flag value and skip
711	 * the old cru detect code.
712	 */
713	dmi_walk(dmi_find_icru, NULL);
714	if (!is_icru) {
715
716		/*
717		* We need to map the ROM to get the CRU service.
718		* For 32 bit Operating Systems we need to go through the 32 Bit
719		* BIOS Service Directory
720		* For 64 bit Operating Systems we get that service through SMBIOS.
721		*/
722		retval = detect_cru_service();
723		if (retval < 0) {
724			dev_warn(&dev->dev,
725				"Unable to detect the %d Bit CRU Service.\n",
726				HPWDT_ARCH);
727			return retval;
728		}
729
730		/*
731		* We know this is the only CRU call we need to make so lets keep as
732		* few instructions as possible once the NMI comes in.
733		*/
734		cmn_regs.u1.rah = 0x0D;
735		cmn_regs.u1.ral = 0x02;
736	}
737
738	/*
739	 * If the priority is set to 1, then we will be put first on the
740	 * die notify list to handle a critical NMI. The default is to
741	 * be last so other users of the NMI signal can function.
742	 */
743	if (priority)
744		die_notifier.priority = 0x7FFFFFFF;
745
746	retval = register_die_notifier(&die_notifier);
747	if (retval != 0) {
748		dev_warn(&dev->dev,
749			"Unable to register a die notifier (err=%d).\n",
750			retval);
751		if (cru_rom_addr)
752			iounmap(cru_rom_addr);
753	}
754
755	dev_info(&dev->dev,
756			"HP Watchdog Timer Driver: NMI decoding initialized"
757			", allow kernel dump: %s (default = 0/OFF)"
758			", priority: %s (default = 0/LAST).\n",
759			(allow_kdump == 0) ? "OFF" : "ON",
760			(priority == 0) ? "LAST" : "FIRST");
761	return 0;
762}
763
764static void hpwdt_exit_nmi_decoding(void)
765{
766	unregister_die_notifier(&die_notifier);
767	if (cru_rom_addr)
768		iounmap(cru_rom_addr);
769}
770#else /* !CONFIG_HPWDT_NMI_DECODING */
771static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
772{
773}
774
775static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
776{
 
 
 
 
 
 
 
 
777	return 0;
778}
779
780static void hpwdt_exit_nmi_decoding(void)
781{
 
 
 
 
 
782}
783#endif /* CONFIG_HPWDT_NMI_DECODING */
784
785static int __devinit hpwdt_init_one(struct pci_dev *dev,
786					const struct pci_device_id *ent)
787{
788	int retval;
789
790	/*
791	 * Check if we can do NMI decoding or not
792	 */
793	hpwdt_check_nmi_decoding(dev);
794
795	/*
796	 * First let's find out if we are on an iLO2+ server. We will
797	 * not run on a legacy ASM box.
798	 * So we only support the G5 ProLiant servers and higher.
799	 */
800	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 
801		dev_warn(&dev->dev,
802			"This server does not have an iLO2+ ASIC.\n");
803		return -ENODEV;
804	}
805
 
 
 
 
 
 
 
806	if (pci_enable_device(dev)) {
807		dev_warn(&dev->dev,
808			"Not possible to enable PCI Device: 0x%x:0x%x.\n",
809			ent->vendor, ent->device);
810		return -ENODEV;
811	}
812
813	pci_mem_addr = pci_iomap(dev, 1, 0x80);
814	if (!pci_mem_addr) {
815		dev_warn(&dev->dev,
816			"Unable to detect the iLO2+ server memory.\n");
817		retval = -ENOMEM;
818		goto error_pci_iomap;
819	}
 
820	hpwdt_timer_reg = pci_mem_addr + 0x70;
821	hpwdt_timer_con = pci_mem_addr + 0x72;
822
823	/* Make sure that we have a valid soft_margin */
824	if (hpwdt_change_timer(soft_margin))
825		hpwdt_change_timer(DEFAULT_MARGIN);
826
827	/* Initialize NMI Decoding functionality */
828	retval = hpwdt_init_nmi_decoding(dev);
829	if (retval != 0)
830		goto error_init_nmi_decoding;
831
832	retval = misc_register(&hpwdt_miscdev);
 
 
 
 
 
833	if (retval < 0) {
834		dev_warn(&dev->dev,
835			"Unable to register miscdev on minor=%d (err=%d).\n",
836			WATCHDOG_MINOR, retval);
837		goto error_misc_register;
838	}
839
840	dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
841			", timer margin: %d seconds (nowayout=%d).\n",
842			HPWDT_VERSION, soft_margin, nowayout);
 
 
 
 
843	return 0;
844
845error_misc_register:
846	hpwdt_exit_nmi_decoding();
847error_init_nmi_decoding:
848	pci_iounmap(dev, pci_mem_addr);
849error_pci_iomap:
850	pci_disable_device(dev);
851	return retval;
852}
853
854static void __devexit hpwdt_exit(struct pci_dev *dev)
855{
856	if (!nowayout)
857		hpwdt_stop();
858
859	misc_deregister(&hpwdt_miscdev);
860	hpwdt_exit_nmi_decoding();
861	pci_iounmap(dev, pci_mem_addr);
862	pci_disable_device(dev);
863}
864
865static struct pci_driver hpwdt_driver = {
866	.name = "hpwdt",
867	.id_table = hpwdt_devices,
868	.probe = hpwdt_init_one,
869	.remove = __devexit_p(hpwdt_exit),
870};
871
872static void __exit hpwdt_cleanup(void)
873{
874	pci_unregister_driver(&hpwdt_driver);
875}
876
877static int __init hpwdt_init(void)
878{
879	return pci_register_driver(&hpwdt_driver);
880}
881
882MODULE_AUTHOR("Tom Mingarelli");
883MODULE_DESCRIPTION("hp watchdog driver");
884MODULE_LICENSE("GPL");
885MODULE_VERSION(HPWDT_VERSION);
886MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
887
888module_param(soft_margin, int, 0);
889MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
890
891module_param(nowayout, int, 0);
892MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
893		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
894
895#ifdef CONFIG_HPWDT_NMI_DECODING
896module_param(allow_kdump, int, 0);
897MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
898
899module_param(priority, int, 0);
900MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
901		" (default = 0/Last)\n");
902#endif /* !CONFIG_HPWDT_NMI_DECODING */
903
904module_init(hpwdt_init);
905module_exit(hpwdt_cleanup);