aboutsummaryrefslogtreecommitdiff
path: root/drivers/pci/hotplug/cpqphp_nvram.c
blob: 76ba8a1c774dfa716d947fc12092e82b8ebfef78 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
/*
 * Compaq Hot Plug Controller Driver
 *
 * Copyright (C) 1995,2001 Compaq Computer Corporation
 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001 IBM Corp.
 *
 * All rights reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <greg@kroah.com>
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include "cpqphp.h"
#include "cpqphp_nvram.h"


#define ROM_INT15_PHY_ADDR		0x0FF859
#define READ_EV				0xD8A4
#define WRITE_EV			0xD8A5

struct register_foo {
	union {
		unsigned long lword;		/* eax */
		unsigned short word;		/* ax */

		struct {
			unsigned char low;	/* al */
			unsigned char high;	/* ah */
		} byte;
	} data;

	unsigned char opcode;	/* see below */
	unsigned long length;	/* if the reg. is a pointer, how much data */
} __attribute__ ((packed));

struct all_reg {
	struct register_foo eax_reg;
	struct register_foo ebx_reg;
	struct register_foo ecx_reg;
	struct register_foo edx_reg;
	struct register_foo edi_reg;
	struct register_foo esi_reg;
	struct register_foo eflags_reg;
} __attribute__ ((packed));


struct ev_hrt_header {
	u8 Version;
	u8 num_of_ctrl;
	u8 next;
};

struct ev_hrt_ctrl {
	u8 bus;
	u8 device;
	u8 function;
	u8 mem_avail;
	u8 p_mem_avail;
	u8 io_avail;
	u8 bus_avail;
	u8 next;
};


static u8 evbuffer_init;
static u8 evbuffer_length;
static u8 evbuffer[1024];

static void __iomem *compaq_int15_entry_point;

/* lock for ordering int15_bios_call() */
static spinlock_t int15_lock;


/* This is a series of function that deals with
 * setting & getting the hotplug resource table in some environment variable.
 */

/*
 * We really shouldn't be doing this unless there is a _very_ good reason to!!!
 * greg k-h
 */


static u32 add_byte( u32 **p_buffer, u8 value, u32 *used, u32 *avail)
{
	u8 **tByte;

	if ((*used + 1) > *avail)
		return(1);

	*((u8*)*p_buffer) = value;
	tByte = (u8**)p_buffer;
	(*tByte)++;
	*used+=1;
	return(0);
}


static u32 add_dword( u32 **p_buffer, u32 value, u32 *used, u32 *avail)
{
	if ((*used + 4) > *avail)
		return(1);

	**p_buffer = value;
	(*p_buffer)++;
	*used+=4;
	return(0);
}


/*
 * check_for_compaq_ROM
 *
 * this routine verifies that the ROM OEM string is 'COMPAQ'
 *
 * returns 0 for non-Compaq ROM, 1 for Compaq ROM
 */
static int check_for_compaq_ROM (void __iomem *rom_start)
{
	u8 temp1, temp2, temp3, temp4, temp5, temp6;
	int result = 0;

	temp1 = readb(rom_start + 0xffea + 0);
	temp2 = readb(rom_start + 0xffea + 1);
	temp3 = readb(rom_start + 0xffea + 2);
	temp4 = readb(rom_start + 0xffea + 3);
	temp5 = readb(rom_start + 0xffea + 4);
	temp6 = readb(rom_start + 0xffea + 5);
	if ((temp1 == 'C') &&
	    (temp2 == 'O') &&
	    (temp3 == 'M') &&
	    (temp4 == 'P') &&
	    (temp5 == 'A') &&
	    (temp6 == 'Q')) {
		result = 1;
	}
	dbg ("%s - returned %d\n", __func__, result);
	return result;
}


static u32 access_EV (u16 operation, u8 *ev_name, u8 *buffer, u32 *buf_size)
{
	unsigned long flags;
	int op = operation;
	int ret_val;

	if (!compaq_int15_entry_point)
		return -ENODEV;

	spin_lock_irqsave(&int15_lock, flags);
	__asm__ (
		"xorl   %%ebx,%%ebx\n" \
		"xorl    %%edx,%%edx\n" \
		"pushf\n" \
		"push %%cs\n" \
		"cli\n" \
		"call *%6\n"
		: "=c" (*buf_size), "=a" (ret_val)
		: "a" (op), "c" (*buf_size), "S" (ev_name),
		"D" (buffer), "m" (compaq_int15_entry_point)
		: "%ebx", "%edx");
	spin_unlock_irqrestore(&int15_lock, flags);

	return((ret_val & 0xFF00) >> 8);
}


/*
 * load_HRT
 *
 * Read the hot plug Resource Table from NVRAM
 */
static int load_HRT (void __iomem *rom_start)
{
	u32 available;
	u32 temp_dword;
	u8 temp_byte = 0xFF;
	u32 rc;

	if (!check_for_compaq_ROM(rom_start)) {
		return -ENODEV;
	}

	available = 1024;

	/* Now load the EV */
	temp_dword = available;

	rc = access_EV(READ_EV, "CQTHPS", evbuffer, &temp_dword);

	evbuffer_length = temp_dword;

	/* We're maintaining the resource lists so write FF to invalidate old
	 * info
	 */
	temp_dword = 1;

	rc = access_EV(WRITE_EV, "CQTHPS", &temp_byte, &temp_dword);

	return rc;
}


/*
 * store_HRT
 *
 * Save the hot plug Resource Table in NVRAM
 */
static u32 store_HRT (void __iomem *rom_start)
{
	u32 *buffer;
	u32 *pFill;
	u32 usedbytes;
	u32 available;
	u32 temp_dword;
	u32 rc;
	u8 loop;
	u8 numCtrl = 0;
	struct controller *ctrl;
	struct pci_resource *resNode;
	struct ev_hrt_header *p_EV_header;
	struct ev_hrt_ctrl *p_ev_ctrl;

	available = 1024;

	if (!check_for_compaq_ROM(rom_start)) {
		return(1);
	}

	buffer = (u32*) evbuffer;

	if (!buffer)
		return(1);

	pFill = buffer;
	usedbytes = 0;

	p_EV_header = (struct ev_hrt_header *) pFill;

	ctrl = cpqhp_ctrl_list;

	/* The revision of this structure */
	rc = add_byte( &pFill, 1 + ctrl->push_flag, &usedbytes, &available);
	if (rc)
		return(rc);

	/* The number of controllers */
	rc = add_byte( &pFill, 1, &usedbytes, &available);
	if (rc)
		return(rc);

	while (ctrl) {
		p_ev_ctrl = (struct ev_hrt_ctrl *) pFill;

		numCtrl++;

		/* The bus number */
		rc = add_byte( &pFill, ctrl->bus, &usedbytes, &available);
		if (rc)
			return(rc);

		/* The device Number */
		rc = add_byte( &pFill, PCI_SLOT(ctrl->pci_dev->devfn), &usedbytes, &available);
		if (rc)
			return(rc);

		/* The function Number */
		rc = add_byte( &pFill, PCI_FUNC(ctrl->pci_dev->devfn), &usedbytes, &available);
		if (rc)
			return(rc);

		/* Skip the number of available entries */
		rc = add_dword( &pFill, 0, &usedbytes, &available);
		if (rc)
			return(rc);

		/* Figure out memory Available */

		resNode = ctrl->mem_head;

		loop = 0;

		while (resNode) {
			loop ++;

			/* base */
			rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
			if (rc)
				return(rc);

			/* length */
			rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
			if (rc)
				return(rc);

			resNode = resNode->next;
		}

		/* Fill in the number of entries */
		p_ev_ctrl->mem_avail = loop;

		/* Figure out prefetchable memory Available */

		resNode = ctrl->p_mem_head;

		loop = 0;

		while (resNode) {
			loop ++;

			/* base */
			rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
			if (rc)
				return(rc);

			/* length */
			rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
			if (rc)
				return(rc);

			resNode = resNode->next;
		}

		/* Fill in the number of entries */
		p_ev_ctrl->p_mem_avail = loop;

		/* Figure out IO Available */

		resNode = ctrl->io_head;

		loop = 0;

		while (resNode) {
			loop ++;

			/* base */
			rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
			if (rc)
				return(rc);

			/* length */
			rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
			if (rc)
				return(rc);

			resNode = resNode->next;
		}

		/* Fill in the number of entries */
		p_ev_ctrl->io_avail = loop;

		/* Figure out bus Available */

		resNode = ctrl->bus_head;

		loop = 0;

		while (resNode) {
			loop ++;

			/* base */
			rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
			if (rc)
				return(rc);

			/* length */
			rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
			if (rc)
				return(rc);

			resNode = resNode->next;
		}

		/* Fill in the number of entries */
		p_ev_ctrl->bus_avail = loop;

		ctrl = ctrl->next;
	}

	p_EV_header->num_of_ctrl = numCtrl;

	/* Now store the EV */

	temp_dword = usedbytes;

	rc = access_EV(WRITE_EV, "CQTHPS", (u8*) buffer, &temp_dword);

	dbg("usedbytes = 0x%x, length = 0x%x\n", usedbytes, temp_dword);

	evbuffer_length = temp_dword;

	if (rc) {
		err(msg_unable_to_save);
		return(1);
	}

	return(0);
}


void compaq_nvram_init (void __iomem *rom_start)
{
	if (rom_start) {
		compaq_int15_entry_point = (rom_start + ROM_INT15_PHY_ADDR - ROM_PHY_ADDR);
	}
	dbg("int15 entry  = %p\n", compaq_int15_entry_point);

	/* initialize our int15 lock */
	spin_lock_init(&int15_lock);
}


int compaq_nvram_load (void __iomem *rom_start, struct controller *ctrl)
{
	u8 bus, device, function;
	u8 nummem, numpmem, numio, numbus;
	u32 rc;
	u8 *p_byte;
	struct pci_resource *mem_node;
	struct pci_resource *p_mem_node;
	struct pci_resource *io_node;
	struct pci_resource *bus_node;
	struct ev_hrt_ctrl *p_ev_ctrl;
	struct ev_hrt_header *p_EV_header;

	if (!evbuffer_init) {
		/* Read the resource list information in from NVRAM */
		if (load_HRT(rom_start))
			memset (evbuffer, 0, 1024);

		evbuffer_init = 1;
	}

	/* If we saved information in NVRAM, use it now */
	p_EV_header = (struct ev_hrt_header *) evbuffer;

	/* The following code is for systems where version 1.0 of this
	 * driver has been loaded, but doesn't support the hardware.
	 * In that case, the driver would incorrectly store something
	 * in NVRAM.
	 */
	if ((p_EV_header->Version == 2) ||
	    ((p_EV_header->Version == 1) && !ctrl->push_flag)) {
		p_byte = &(p_EV_header->next);

		p_ev_ctrl = (struct ev_hrt_ctrl *) &(p_EV_header->next);

		p_byte += 3;

		if (p_byte > ((u8*)p_EV_header + evbuffer_length))
			return 2;

		bus = p_ev_ctrl->bus;
		device = p_ev_ctrl->device;
		function = p_ev_ctrl->function;

		while ((bus != ctrl->bus) ||
		       (device != PCI_SLOT(ctrl->pci_dev->devfn)) ||
		       (function != PCI_FUNC(ctrl->pci_dev->devfn))) {
			nummem = p_ev_ctrl->mem_avail;
			numpmem = p_ev_ctrl->p_mem_avail;
			numio = p_ev_ctrl->io_avail;
			numbus = p_ev_ctrl->bus_avail;

			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length))
				return 2;

			/* Skip forward to the next entry */
			p_byte += (nummem + numpmem + numio + numbus) * 8;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length))
				return 2;

			p_ev_ctrl = (struct ev_hrt_ctrl *) p_byte;

			p_byte += 3;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length))
				return 2;

			bus = p_ev_ctrl->bus;
			device = p_ev_ctrl->device;
			function = p_ev_ctrl->function;
		}

		nummem = p_ev_ctrl->mem_avail;
		numpmem = p_ev_ctrl->p_mem_avail;
		numio = p_ev_ctrl->io_avail;
		numbus = p_ev_ctrl->bus_avail;

		p_byte += 4;

		if (p_byte > ((u8*)p_EV_header + evbuffer_length))
			return 2;

		while (nummem--) {
			mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);

			if (!mem_node)
				break;

			mem_node->base = *(u32*)p_byte;
			dbg("mem base = %8.8x\n",mem_node->base);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(mem_node);
				return 2;
			}

			mem_node->length = *(u32*)p_byte;
			dbg("mem length = %8.8x\n",mem_node->length);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(mem_node);
				return 2;
			}

			mem_node->next = ctrl->mem_head;
			ctrl->mem_head = mem_node;
		}

		while (numpmem--) {
			p_mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);

			if (!p_mem_node)
				break;

			p_mem_node->base = *(u32*)p_byte;
			dbg("pre-mem base = %8.8x\n",p_mem_node->base);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(p_mem_node);
				return 2;
			}

			p_mem_node->length = *(u32*)p_byte;
			dbg("pre-mem length = %8.8x\n",p_mem_node->length);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(p_mem_node);
				return 2;
			}

			p_mem_node->next = ctrl->p_mem_head;
			ctrl->p_mem_head = p_mem_node;
		}

		while (numio--) {
			io_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);

			if (!io_node)
				break;

			io_node->base = *(u32*)p_byte;
			dbg("io base = %8.8x\n",io_node->base);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(io_node);
				return 2;
			}

			io_node->length = *(u32*)p_byte;
			dbg("io length = %8.8x\n",io_node->length);
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(io_node);
				return 2;
			}

			io_node->next = ctrl->io_head;
			ctrl->io_head = io_node;
		}

		while (numbus--) {
			bus_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);

			if (!bus_node)
				break;

			bus_node->base = *(u32*)p_byte;
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(bus_node);
				return 2;
			}

			bus_node->length = *(u32*)p_byte;
			p_byte += 4;

			if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
				kfree(bus_node);
				return 2;
			}

			bus_node->next = ctrl->bus_head;
			ctrl->bus_head = bus_node;
		}

		/* If all of the following fail, we don't have any resources for
		 * hot plug add
		 */
		rc = 1;
		rc &= cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
		rc &= cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
		rc &= cpqhp_resource_sort_and_combine(&(ctrl->io_head));
		rc &= cpqhp_resource_sort_and_combine(&(ctrl->bus_head));

		if (rc)
			return(rc);
	} else {
		if ((evbuffer[0] != 0) && (!ctrl->push_flag))
			return 1;
	}

	return 0;
}


int compaq_nvram_store (void __iomem *rom_start)
{
	int rc = 1;

	if (rom_start == NULL)
		return -ENODEV;

	if (evbuffer_init) {
		rc = store_HRT(rom_start);
		if (rc) {
			err(msg_unable_to_save);
		}
	}
	return rc;
}