aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/edac/i82875p_edac.c
blob: c53f08d764c4ebf2d2f7be540ea6de46ce65e36b (plain) (blame)
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
/*
 * Intel D82875P Memory Controller kernel module
 * (C) 2003 Linux Networx (http://lnxi.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written by Thayne Harbaugh
 * Contributors:
 *	Wang Zhenyu at intel.com
 *
 * $Id: edac_i82875p.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $
 *
 * Note: E7210 appears same as D82875P - zhenyu.z.wang at intel.com
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include "edac_core.h"

#define I82875P_REVISION	" Ver: 2.0.2 " __DATE__
#define EDAC_MOD_STR		"i82875p_edac"

#define i82875p_printk(level, fmt, arg...) \
	edac_printk(level, "i82875p", fmt, ##arg)

#define i82875p_mc_printk(mci, level, fmt, arg...) \
	edac_mc_chipset_printk(mci, level, "i82875p", fmt, ##arg)

#ifndef PCI_DEVICE_ID_INTEL_82875_0
#define PCI_DEVICE_ID_INTEL_82875_0	0x2578
#endif				/* PCI_DEVICE_ID_INTEL_82875_0 */

#ifndef PCI_DEVICE_ID_INTEL_82875_6
#define PCI_DEVICE_ID_INTEL_82875_6	0x257e
#endif				/* PCI_DEVICE_ID_INTEL_82875_6 */

/* four csrows in dual channel, eight in single channel */
#define I82875P_NR_CSROWS(nr_chans) (8/(nr_chans))

/* Intel 82875p register addresses - device 0 function 0 - DRAM Controller */
#define I82875P_EAP		0x58	/* Error Address Pointer (32b)
					 *
					 * 31:12 block address
					 * 11:0  reserved
					 */

#define I82875P_DERRSYN		0x5c	/* DRAM Error Syndrome (8b)
					 *
					 *  7:0  DRAM ECC Syndrome
					 */

#define I82875P_DES		0x5d	/* DRAM Error Status (8b)
					 *
					 *  7:1  reserved
					 *  0    Error channel 0/1
					 */

#define I82875P_ERRSTS		0xc8	/* Error Status Register (16b)
					 *
					 * 15:10 reserved
					 *  9    non-DRAM lock error (ndlock)
					 *  8    Sftwr Generated SMI
					 *  7    ECC UE
					 *  6    reserved
					 *  5    MCH detects unimplemented cycle
					 *  4    AGP access outside GA
					 *  3    Invalid AGP access
					 *  2    Invalid GA translation table
					 *  1    Unsupported AGP command
					 *  0    ECC CE
					 */

#define I82875P_ERRCMD		0xca	/* Error Command (16b)
					 *
					 * 15:10 reserved
					 *  9    SERR on non-DRAM lock
					 *  8    SERR on ECC UE
					 *  7    SERR on ECC CE
					 *  6    target abort on high exception
					 *  5    detect unimplemented cyc
					 *  4    AGP access outside of GA
					 *  3    SERR on invalid AGP access
					 *  2    invalid translation table
					 *  1    SERR on unsupported AGP command
					 *  0    reserved
					 */

/* Intel 82875p register addresses - device 6 function 0 - DRAM Controller */
#define I82875P_PCICMD6		0x04	/* PCI Command Register (16b)
					 *
					 * 15:10 reserved
					 *  9    fast back-to-back - ro 0
					 *  8    SERR enable - ro 0
					 *  7    addr/data stepping - ro 0
					 *  6    parity err enable - ro 0
					 *  5    VGA palette snoop - ro 0
					 *  4    mem wr & invalidate - ro 0
					 *  3    special cycle - ro 0
					 *  2    bus master - ro 0
					 *  1    mem access dev6 - 0(dis),1(en)
					 *  0    IO access dev3 - 0(dis),1(en)
					 */

#define I82875P_BAR6		0x10	/* Mem Delays Base ADDR Reg (32b)
					 *
					 * 31:12 mem base addr [31:12]
					 * 11:4  address mask - ro 0
					 *  3    prefetchable - ro 0(non),1(pre)
					 *  2:1  mem type - ro 0
					 *  0    mem space - ro 0
					 */

/* Intel 82875p MMIO register space - device 0 function 0 - MMR space */

#define I82875P_DRB_SHIFT 26	/* 64MiB grain */
#define I82875P_DRB		0x00	/* DRAM Row Boundary (8b x 8)
					 *
					 *  7    reserved
					 *  6:0  64MiB row boundary addr
					 */

#define I82875P_DRA		0x10	/* DRAM Row Attribute (4b x 8)
					 *
					 *  7    reserved
					 *  6:4  row attr row 1
					 *  3    reserved
					 *  2:0  row attr row 0
					 *
					 * 000 =  4KiB
					 * 001 =  8KiB
					 * 010 = 16KiB
					 * 011 = 32KiB
					 */

#define I82875P_DRC		0x68	/* DRAM Controller Mode (32b)
					 *
					 * 31:30 reserved
					 * 29    init complete
					 * 28:23 reserved
					 * 22:21 nr chan 00=1,01=2
					 * 20    reserved
					 * 19:18 Data Integ Mode 00=none,01=ecc
					 * 17:11 reserved
					 * 10:8  refresh mode
					 *  7    reserved
					 *  6:4  mode select
					 *  3:2  reserved
					 *  1:0  DRAM type 01=DDR
					 */

enum i82875p_chips {
	I82875P = 0,
};

struct i82875p_pvt {
	struct pci_dev *ovrfl_pdev;
	void __iomem *ovrfl_window;
};

struct i82875p_dev_info {
	const char *ctl_name;
};

struct i82875p_error_info {
	u16 errsts;
	u32 eap;
	u8 des;
	u8 derrsyn;
	u16 errsts2;
};

static const struct i82875p_dev_info i82875p_devs[] = {
	[I82875P] = {
		.ctl_name = "i82875p"
	},
};

static struct pci_dev *mci_pdev = NULL;	/* init dev: in case that AGP code has
					 * already registered driver
					 */

static int i82875p_registered = 1;

static void i82875p_get_error_info(struct mem_ctl_info *mci,
		struct i82875p_error_info *info)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev(mci->dev);

	/*
	 * This is a mess because there is no atomic way to read all the
	 * registers at once and the registers can transition from CE being
	 * overwritten by UE.
	 */
	pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts);
	pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
	pci_read_config_byte(pdev, I82875P_DES, &info->des);
	pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn);
	pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts2);

	pci_write_bits16(pdev, I82875P_ERRSTS, 0x0081, 0x0081);

	/*
	 * If the error is the same then we can for both reads then
	 * the first set of reads is valid.  If there is a change then
	 * there is a CE no info and the second set of reads is valid
	 * and should be UE info.
	 */
	if (!(info->errsts2 & 0x0081))
		return;

	if ((info->errsts ^ info->errsts2) & 0x0081) {
		pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
		pci_read_config_byte(pdev, I82875P_DES, &info->des);
		pci_read_config_byte(pdev, I82875P_DERRSYN,
				&info->derrsyn);
	}
}

static int i82875p_process_error_info(struct mem_ctl_info *mci,
		struct i82875p_error_info *info, int handle_errors)
{
	int row, multi_chan;

	multi_chan = mci->csrows[0].nr_channels - 1;

	if (!(info->errsts2 & 0x0081))
		return 0;

	if (!handle_errors)
		return 1;

	if ((info->errsts ^ info->errsts2) & 0x0081) {
		edac_mc_handle_ce_no_info(mci, "UE overwrote CE");
		info->errsts = info->errsts2;
	}

	info->eap >>= PAGE_SHIFT;
	row = edac_mc_find_csrow_by_page(mci, info->eap);

	if (info->errsts & 0x0080)
		edac_mc_handle_ue(mci, info->eap, 0, row, "i82875p UE");
	else
		edac_mc_handle_ce(mci, info->eap, 0, info->derrsyn, row,
				multi_chan ? (info->des & 0x1) : 0,
				"i82875p CE");

	return 1;
}

static void i82875p_check(struct mem_ctl_info *mci)
{
	struct i82875p_error_info info;

	debugf1("MC%d: %s()\n", mci->mc_idx, __func__);
	i82875p_get_error_info(mci, &info);
	i82875p_process_error_info(mci, &info, 1);
}

/* Return 0 on success or 1 on failure. */
static int i82875p_setup_overfl_dev(struct pci_dev *pdev,
		struct pci_dev **ovrfl_pdev, void __iomem **ovrfl_window)
{
	struct pci_dev *dev;
	void __iomem *window;

	*ovrfl_pdev = NULL;
	*ovrfl_window = NULL;
	dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);

	if (dev == NULL) {
		/* Intel tells BIOS developers to hide device 6 which
		 * configures the overflow device access containing
		 * the DRBs - this is where we expose device 6.
		 * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm
		 */
		pci_write_bits8(pdev, 0xf4, 0x2, 0x2);
		dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0));

		if (dev == NULL)
			return 1;

        	pci_bus_add_device(dev);
	}

	*ovrfl_pdev = dev;

	if (pci_enable_device(dev)) {
		i82875p_printk(KERN_ERR, "%s(): Failed to enable overflow "
			       "device\n", __func__);
		return 1;
	}

	if (pci_request_regions(dev, pci_name(dev))) {
#ifdef CORRECT_BIOS
		goto fail0;
#endif
	}

	/* cache is irrelevant for PCI bus reads/writes */
	window = ioremap_nocache(pci_resource_start(dev, 0),
				 pci_resource_len(dev, 0));

	if (window == NULL) {
		i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n",
			       __func__);
		goto fail1;
	}

	*ovrfl_window = window;
	return 0;

fail1:
	pci_release_regions(dev);

#ifdef CORRECT_BIOS
fail0:
	pci_disable_device(dev);
#endif
	/* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
	return 1;
}


/* Return 1 if dual channel mode is active.  Else return 0. */
static inline int dual_channel_active(u32 drc)
{
	return (drc >> 21) & 0x1;
}


static void i82875p_init_csrows(struct mem_ctl_info *mci,
		struct pci_dev *pdev, void __iomem *ovrfl_window, u32 drc)
{
	struct csrow_info *csrow;
	unsigned long last_cumul_size;
	u8 value;
	u32 drc_ddim;  /* DRAM Data Integrity Mode 0=none,2=edac */
	u32 cumul_size;
	int index;

	drc_ddim = (drc >> 18) & 0x1;
	last_cumul_size = 0;

	/* The dram row boundary (DRB) reg values are boundary address
	 * for each DRAM row with a granularity of 32 or 64MB (single/dual
	 * channel operation).  DRB regs are cumulative; therefore DRB7 will
	 * contain the total memory contained in all eight rows.
	 */

	for (index = 0; index < mci->nr_csrows; index++) {
		csrow = &mci->csrows[index];

		value = readb(ovrfl_window + I82875P_DRB + index);
		cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT);
		debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
			cumul_size);
		if (cumul_size == last_cumul_size)
			continue;	/* not populated */

		csrow->first_page = last_cumul_size;
		csrow->last_page = cumul_size - 1;
		csrow->nr_pages = cumul_size - last_cumul_size;
		last_cumul_size = cumul_size;
		csrow->grain = 1 << 12;	/* I82875P_EAP has 4KiB reolution */
		csrow->mtype = MEM_DDR;
		csrow->dtype = DEV_UNKNOWN;
		csrow->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE;
	}
}

static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
{
	int rc = -ENODEV;
	struct mem_ctl_info *mci;
	struct i82875p_pvt *pvt;
	struct pci_dev *ovrfl_pdev;
	void __iomem *ovrfl_window;
	u32 drc;
	u32 nr_chans;
	struct i82875p_error_info discard;

	debugf0("%s()\n", __func__);
	ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);

	if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window))
		return -ENODEV;
	drc = readl(ovrfl_window + I82875P_DRC);
	nr_chans = dual_channel_active(drc) + 1;
	mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans),
				nr_chans);

	if (!mci) {
		rc = -ENOMEM;
		goto fail0;
	}

	debugf3("%s(): init mci\n", __func__);
	mci->dev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_DDR;
	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_UNKNOWN;
	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = I82875P_REVISION;
	mci->ctl_name = i82875p_devs[dev_idx].ctl_name;
	mci->edac_check = i82875p_check;
	mci->ctl_page_to_phys = NULL;
	debugf3("%s(): init pvt\n", __func__);
	pvt = (struct i82875p_pvt *) mci->pvt_info;
	pvt->ovrfl_pdev = ovrfl_pdev;
	pvt->ovrfl_window = ovrfl_window;
	i82875p_init_csrows(mci, pdev, ovrfl_window, drc);
	i82875p_get_error_info(mci, &discard);  /* clear counters */

	/* Here we assume that we will never see multiple instances of this
	 * type of memory controller.  The ID is therefore hardcoded to 0.
	 */
	if (edac_mc_add_mc(mci,0)) {
		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
		goto fail1;
	}

	/* get this far and it's successful */
	debugf3("%s(): success\n", __func__);
	return 0;

fail1:
	edac_mc_free(mci);

fail0:
	iounmap(ovrfl_window);
	pci_release_regions(ovrfl_pdev);

	pci_disable_device(ovrfl_pdev);
	/* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
	return rc;
}

/* returns count (>= 0), or negative on error */
static int __devinit i82875p_init_one(struct pci_dev *pdev,
		const struct pci_device_id *ent)
{
	int rc;

	debugf0("%s()\n", __func__);
	i82875p_printk(KERN_INFO, "i82875p init one\n");

	if (pci_enable_device(pdev) < 0)
		return -EIO;

	rc = i82875p_probe1(pdev, ent->driver_data);

	if (mci_pdev == NULL)
		mci_pdev = pci_dev_get(pdev);

	return rc;
}

static void __devexit i82875p_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;
	struct i82875p_pvt *pvt = NULL;

	debugf0("%s()\n", __func__);

	if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
		return;

	pvt = (struct i82875p_pvt *) mci->pvt_info;

	if (pvt->ovrfl_window)
		iounmap(pvt->ovrfl_window);

	if (pvt->ovrfl_pdev) {
#ifdef CORRECT_BIOS
		pci_release_regions(pvt->ovrfl_pdev);
#endif				/*CORRECT_BIOS */
		pci_disable_device(pvt->ovrfl_pdev);
		pci_dev_put(pvt->ovrfl_pdev);
	}

	edac_mc_free(mci);
}

static const struct pci_device_id i82875p_pci_tbl[] __devinitdata = {
	{
		PCI_VEND_DEV(INTEL, 82875_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		I82875P
	},
	{
		0,
	}	/* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, i82875p_pci_tbl);

static struct pci_driver i82875p_driver = {
	.name = EDAC_MOD_STR,
	.probe = i82875p_init_one,
	.remove = __devexit_p(i82875p_remove_one),
	.id_table = i82875p_pci_tbl,
};

static int __init i82875p_init(void)
{
	int pci_rc;

	debugf3("%s()\n", __func__);
	pci_rc = pci_register_driver(&i82875p_driver);

	if (pci_rc < 0)
		goto fail0;

	if (mci_pdev == NULL) {
		mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
				PCI_DEVICE_ID_INTEL_82875_0, NULL);

		if (!mci_pdev) {
			debugf0("875p pci_get_device fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}

		pci_rc = i82875p_init_one(mci_pdev, i82875p_pci_tbl);

		if (pci_rc < 0) {
			debugf0("875p init fail\n");
			pci_rc = -ENODEV;
			goto fail1;
		}
	}

	return 0;

fail1:
	pci_unregister_driver(&i82875p_driver);

fail0:
	if (mci_pdev != NULL)
		pci_dev_put(mci_pdev);

	return pci_rc;
}

static void __exit i82875p_exit(void)
{
	debugf3("%s()\n", __func__);

	pci_unregister_driver(&i82875p_driver);

	if (!i82875p_registered) {
		i82875p_remove_one(mci_pdev);
		pci_dev_put(mci_pdev);
	}
}

module_init(i82875p_init);
module_exit(i82875p_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
MODULE_DESCRIPTION("MC support for Intel 82875 memory hub controllers");