summaryrefslogtreecommitdiffstats
path: root/drivers/edac/amd76x_edac.c
blob: eaa225192098aabab4fba3774ff33df3cc8ac6eb (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
/*
 * AMD 76x 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
 * Based on work by Dan Hollis <goemon at anime dot net> and others.
 *	http://www.anime.net/~goemon/linux-ecc/
 *
 * $Id: edac_amd76x.c,v 1.4.2.5 2005/10/05 00:43:44 dsp_llnl Exp $
 *
 */

#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 AMD76X_REVISION	" Ver: 2.0.2 "  __DATE__
#define EDAC_MOD_STR	"amd76x_edac"

#define amd76x_printk(level, fmt, arg...) \
	edac_printk(level, "amd76x", fmt, ##arg)

#define amd76x_mc_printk(mci, level, fmt, arg...) \
	edac_mc_chipset_printk(mci, level, "amd76x", fmt, ##arg)

#define AMD76X_NR_CSROWS 8
#define AMD76X_NR_CHANS  1
#define AMD76X_NR_DIMMS  4

/* AMD 76x register addresses - device 0 function 0 - PCI bridge */

#define AMD76X_ECC_MODE_STATUS	0x48	/* Mode and status of ECC (32b)
					 *
					 * 31:16 reserved
					 * 15:14 SERR enabled: x1=ue 1x=ce
					 * 13    reserved
					 * 12    diag: disabled, enabled
					 * 11:10 mode: dis, EC, ECC, ECC+scrub
					 *  9:8  status: x1=ue 1x=ce
					 *  7:4  UE cs row
					 *  3:0  CE cs row
					 */

#define AMD76X_DRAM_MODE_STATUS	0x58	/* DRAM Mode and status (32b)
					 *
					 * 31:26 clock disable 5 - 0
					 * 25    SDRAM init
					 * 24    reserved
					 * 23    mode register service
					 * 22:21 suspend to RAM
					 * 20    burst refresh enable
					 * 19    refresh disable
					 * 18    reserved
					 * 17:16 cycles-per-refresh
					 * 15:8  reserved
					 *  7:0  x4 mode enable 7 - 0
					 */

#define AMD76X_MEM_BASE_ADDR	0xC0	/* Memory base address (8 x 32b)
					 *
					 * 31:23 chip-select base
					 * 22:16 reserved
					 * 15:7  chip-select mask
					 *  6:3  reserved
					 *  2:1  address mode
					 *  0    chip-select enable
					 */

struct amd76x_error_info {
	u32 ecc_mode_status;
};

enum amd76x_chips {
	AMD761 = 0,
	AMD762
};

struct amd76x_dev_info {
	const char *ctl_name;
};

static const struct amd76x_dev_info amd76x_devs[] = {
	[AMD761] = {
		    .ctl_name = "AMD761"},
	[AMD762] = {
		    .ctl_name = "AMD762"},
};

/**
 *	amd76x_get_error_info	-	fetch error information
 *	@mci: Memory controller
 *	@info: Info to fill in
 *
 *	Fetch and store the AMD76x ECC status. Clear pending status
 *	on the chip so that further errors will be reported
 */
static void amd76x_get_error_info(struct mem_ctl_info *mci,
				  struct amd76x_error_info *info)
{
	struct pci_dev *pdev;

	pdev = to_pci_dev(mci->dev);
	pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS,
			      &info->ecc_mode_status);

	if (info->ecc_mode_status & BIT(8))
		pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
				 (u32) BIT(8), (u32) BIT(8));

	if (info->ecc_mode_status & BIT(9))
		pci_write_bits32(pdev, AMD76X_ECC_MODE_STATUS,
				 (u32) BIT(9), (u32) BIT(9));
}

/**
 *	amd76x_process_error_info	-	Error check
 *	@mci: Memory controller
 *	@info: Previously fetched information from chip
 *	@handle_errors: 1 if we should do recovery
 *
 *	Process the chip state and decide if an error has occurred.
 *	A return of 1 indicates an error. Also if handle_errors is true
 *	then attempt to handle and clean up after the error
 */
static int amd76x_process_error_info(struct mem_ctl_info *mci,
				     struct amd76x_error_info *info,
				     int handle_errors)
{
	int error_found;
	u32 row;

	error_found = 0;

	/*
	 *      Check for an uncorrectable error
	 */
	if (info->ecc_mode_status & BIT(8)) {
		error_found = 1;

		if (handle_errors) {
			row = (info->ecc_mode_status >> 4) & 0xf;
			edac_mc_handle_ue(mci, mci->csrows[row].first_page, 0,
					  row, mci->ctl_name);
		}
	}

	/*
	 *      Check for a correctable error
	 */
	if (info->ecc_mode_status & BIT(9)) {
		error_found = 1;

		if (handle_errors) {
			row = info->ecc_mode_status & 0xf;
			edac_mc_handle_ce(mci, mci->csrows[row].first_page, 0,
					  0, row, 0, mci->ctl_name);
		}
	}

	return error_found;
}

/**
 *	amd76x_check	-	Poll the controller
 *	@mci: Memory controller
 *
 *	Called by the poll handlers this function reads the status
 *	from the controller and checks for errors.
 */
static void amd76x_check(struct mem_ctl_info *mci)
{
	struct amd76x_error_info info;
	debugf3("%s()\n", __func__);
	amd76x_get_error_info(mci, &info);
	amd76x_process_error_info(mci, &info, 1);
}

static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
			       enum edac_type edac_mode)
{
	struct csrow_info *csrow;
	u32 mba, mba_base, mba_mask, dms;
	int index;

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

		/* find the DRAM Chip Select Base address and mask */
		pci_read_config_dword(pdev,
				      AMD76X_MEM_BASE_ADDR + (index * 4), &mba);

		if (!(mba & BIT(0)))
			continue;

		mba_base = mba & 0xff800000UL;
		mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
		pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
		csrow->first_page = mba_base >> PAGE_SHIFT;
		csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
		csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
		csrow->page_mask = mba_mask >> PAGE_SHIFT;
		csrow->grain = csrow->nr_pages << PAGE_SHIFT;
		csrow->mtype = MEM_RDDR;
		csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
		csrow->edac_mode = edac_mode;
	}
}

/**
 *	amd76x_probe1	-	Perform set up for detected device
 *	@pdev; PCI device detected
 *	@dev_idx: Device type index
 *
 *	We have found an AMD76x and now need to set up the memory
 *	controller status reporting. We configure and set up the
 *	memory controller reporting and claim the device.
 */
static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
{
	static const enum edac_type ems_modes[] = {
		EDAC_NONE,
		EDAC_EC,
		EDAC_SECDED,
		EDAC_SECDED
	};
	struct mem_ctl_info *mci = NULL;
	u32 ems;
	u32 ems_mode;
	struct amd76x_error_info discard;

	debugf0("%s()\n", __func__);
	pci_read_config_dword(pdev, AMD76X_ECC_MODE_STATUS, &ems);
	ems_mode = (ems >> 10) & 0x3;
	mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);

	if (mci == NULL) {
		return -ENOMEM;
	}

	debugf0("%s(): mci = %p\n", __func__, mci);
	mci->dev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_RDDR;
	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
	mci->edac_cap = ems_mode ?
	    (EDAC_FLAG_EC | EDAC_FLAG_SECDED) : EDAC_FLAG_NONE;
	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = AMD76X_REVISION;
	mci->ctl_name = amd76x_devs[dev_idx].ctl_name;
	mci->dev_name = pci_name(pdev);
	mci->edac_check = amd76x_check;
	mci->ctl_page_to_phys = NULL;

	amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
	amd76x_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 fail;
	}

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

      fail:
	edac_mc_free(mci);
	return -ENODEV;
}

/* returns count (>= 0), or negative on error */
static int __devinit amd76x_init_one(struct pci_dev *pdev,
				     const struct pci_device_id *ent)
{
	debugf0("%s()\n", __func__);

	/* don't need to call pci_device_enable() */
	return amd76x_probe1(pdev, ent->driver_data);
}

/**
 *	amd76x_remove_one	-	driver shutdown
 *	@pdev: PCI device being handed back
 *
 *	Called when the driver is unloaded. Find the matching mci
 *	structure for the device then delete the mci and free the
 *	resources.
 */
static void __devexit amd76x_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;

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

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

	edac_mc_free(mci);
}

static const struct pci_device_id amd76x_pci_tbl[] __devinitdata = {
	{
	 PCI_VEND_DEV(AMD, FE_GATE_700C), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	 AMD762},
	{
	 PCI_VEND_DEV(AMD, FE_GATE_700E), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	 AMD761},
	{
	 0,
	 }			/* 0 terminated list. */
};

MODULE_DEVICE_TABLE(pci, amd76x_pci_tbl);

static struct pci_driver amd76x_driver = {
	.name = EDAC_MOD_STR,
	.probe = amd76x_init_one,
	.remove = __devexit_p(amd76x_remove_one),
	.id_table = amd76x_pci_tbl,
};

static int __init amd76x_init(void)
{
	return pci_register_driver(&amd76x_driver);
}

static void __exit amd76x_exit(void)
{
	pci_unregister_driver(&amd76x_driver);
}

module_init(amd76x_init);
module_exit(amd76x_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
MODULE_DESCRIPTION("MC support for AMD 76x memory controllers");
OpenPOWER on IntegriCloud