aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/qib/qib_eeprom.c
blob: 92d9cfe98a68b1065cd2bcc1ef44d1a7aee78048 (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
/*
 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>

#include "qib.h"

/*
 * Functions specific to the serial EEPROM on cards handled by ib_qib.
 * The actual serail interface code is in qib_twsi.c. This file is a client
 */

/**
 * qib_eeprom_read - receives bytes from the eeprom via I2C
 * @dd: the qlogic_ib device
 * @eeprom_offset: address to read from
 * @buffer: where to store result
 * @len: number of bytes to receive
 */
int qib_eeprom_read(struct qib_devdata *dd, u8 eeprom_offset,
		    void *buff, int len)
{
	int ret;

	ret = mutex_lock_interruptible(&dd->eep_lock);
	if (!ret) {
		ret = qib_twsi_reset(dd);
		if (ret)
			qib_dev_err(dd, "EEPROM Reset for read failed\n");
		else
			ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev,
					      eeprom_offset, buff, len);
		mutex_unlock(&dd->eep_lock);
	}

	return ret;
}

/*
 * Actually update the eeprom, first doing write enable if
 * needed, then restoring write enable state.
 * Must be called with eep_lock held
 */
static int eeprom_write_with_enable(struct qib_devdata *dd, u8 offset,
		     const void *buf, int len)
{
	int ret, pwen;

	pwen = dd->f_eeprom_wen(dd, 1);
	ret = qib_twsi_reset(dd);
	if (ret)
		qib_dev_err(dd, "EEPROM Reset for write failed\n");
	else
		ret = qib_twsi_blk_wr(dd, dd->twsi_eeprom_dev,
				      offset, buf, len);
	dd->f_eeprom_wen(dd, pwen);
	return ret;
}

/**
 * qib_eeprom_write - writes data to the eeprom via I2C
 * @dd: the qlogic_ib device
 * @eeprom_offset: where to place data
 * @buffer: data to write
 * @len: number of bytes to write
 */
int qib_eeprom_write(struct qib_devdata *dd, u8 eeprom_offset,
		     const void *buff, int len)
{
	int ret;

	ret = mutex_lock_interruptible(&dd->eep_lock);
	if (!ret) {
		ret = eeprom_write_with_enable(dd, eeprom_offset, buff, len);
		mutex_unlock(&dd->eep_lock);
	}

	return ret;
}

static u8 flash_csum(struct qib_flash *ifp, int adjust)
{
	u8 *ip = (u8 *) ifp;
	u8 csum = 0, len;

	/*
	 * Limit length checksummed to max length of actual data.
	 * Checksum of erased eeprom will still be bad, but we avoid
	 * reading past the end of the buffer we were passed.
	 */
	len = ifp->if_length;
	if (len > sizeof(struct qib_flash))
		len = sizeof(struct qib_flash);
	while (len--)
		csum += *ip++;
	csum -= ifp->if_csum;
	csum = ~csum;
	if (adjust)
		ifp->if_csum = csum;

	return csum;
}

/**
 * qib_get_eeprom_info- get the GUID et al. from the TSWI EEPROM device
 * @dd: the qlogic_ib device
 *
 * We have the capability to use the nguid field, and get
 * the guid from the first chip's flash, to use for all of them.
 */
void qib_get_eeprom_info(struct qib_devdata *dd)
{
	void *buf;
	struct qib_flash *ifp;
	__be64 guid;
	int len, eep_stat;
	u8 csum, *bguid;
	int t = dd->unit;
	struct qib_devdata *dd0 = qib_lookup(0);

	if (t && dd0->nguid > 1 && t <= dd0->nguid) {
		u8 oguid;
		dd->base_guid = dd0->base_guid;
		bguid = (u8 *) &dd->base_guid;

		oguid = bguid[7];
		bguid[7] += t;
		if (oguid > bguid[7]) {
			if (bguid[6] == 0xff) {
				if (bguid[5] == 0xff) {
					qib_dev_err(dd, "Can't set %s GUID"
						    " from base, wraps to"
						    " OUI!\n",
						    qib_get_unit_name(t));
					dd->base_guid = 0;
					goto bail;
				}
				bguid[5]++;
			}
			bguid[6]++;
		}
		dd->nguid = 1;
		goto bail;
	}

	/*
	 * Read full flash, not just currently used part, since it may have
	 * been written with a newer definition.
	 * */
	len = sizeof(struct qib_flash);
	buf = vmalloc(len);
	if (!buf) {
		qib_dev_err(dd, "Couldn't allocate memory to read %u "
			    "bytes from eeprom for GUID\n", len);
		goto bail;
	}

	/*
	 * Use "public" eeprom read function, which does locking and
	 * figures out device. This will migrate to chip-specific.
	 */
	eep_stat = qib_eeprom_read(dd, 0, buf, len);

	if (eep_stat) {
		qib_dev_err(dd, "Failed reading GUID from eeprom\n");
		goto done;
	}
	ifp = (struct qib_flash *)buf;

	csum = flash_csum(ifp, 0);
	if (csum != ifp->if_csum) {
		qib_devinfo(dd->pcidev, "Bad I2C flash checksum: "
			 "0x%x, not 0x%x\n", csum, ifp->if_csum);
		goto done;
	}
	if (*(__be64 *) ifp->if_guid == cpu_to_be64(0) ||
	    *(__be64 *) ifp->if_guid == ~cpu_to_be64(0)) {
		qib_dev_err(dd, "Invalid GUID %llx from flash; ignoring\n",
			    *(unsigned long long *) ifp->if_guid);
		/* don't allow GUID if all 0 or all 1's */
		goto done;
	}

	/* complain, but allow it */
	if (*(u64 *) ifp->if_guid == 0x100007511000000ULL)
		qib_devinfo(dd->pcidev, "Warning, GUID %llx is "
			 "default, probably not correct!\n",
			 *(unsigned long long *) ifp->if_guid);

	bguid = ifp->if_guid;
	if (!bguid[0] && !bguid[1] && !bguid[2]) {
		/*
		 * Original incorrect GUID format in flash; fix in
		 * core copy, by shifting up 2 octets; don't need to
		 * change top octet, since both it and shifted are 0.
		 */
		bguid[1] = bguid[3];
		bguid[2] = bguid[4];
		bguid[3] = 0;
		bguid[4] = 0;
		guid = *(__be64 *) ifp->if_guid;
	} else
		guid = *(__be64 *) ifp->if_guid;
	dd->base_guid = guid;
	dd->nguid = ifp->if_numguid;
	/*
	 * Things are slightly complicated by the desire to transparently
	 * support both the Pathscale 10-digit serial number and the QLogic
	 * 13-character version.
	 */
	if ((ifp->if_fversion > 1) && ifp->if_sprefix[0] &&
	    ((u8 *) ifp->if_sprefix)[0] != 0xFF) {
		char *snp = dd->serial;

		/*
		 * This board has a Serial-prefix, which is stored
		 * elsewhere for backward-compatibility.
		 */
		memcpy(snp, ifp->if_sprefix, sizeof ifp->if_sprefix);
		snp[sizeof ifp->if_sprefix] = '\0';
		len = strlen(snp);
		snp += len;
		len = (sizeof dd->serial) - len;
		if (len > sizeof ifp->if_serial)
			len = sizeof ifp->if_serial;
		memcpy(snp, ifp->if_serial, len);
	} else
		memcpy(dd->serial, ifp->if_serial,
		       sizeof ifp->if_serial);
	if (!strstr(ifp->if_comment, "Tested successfully"))
		qib_dev_err(dd, "Board SN %s did not pass functional "
			    "test: %s\n", dd->serial, ifp->if_comment);

	memcpy(&dd->eep_st_errs, &ifp->if_errcntp, QIB_EEP_LOG_CNT);
	/*
	 * Power-on (actually "active") hours are kept as little-endian value
	 * in EEPROM, but as seconds in a (possibly as small as 24-bit)
	 * atomic_t while running.
	 */
	atomic_set(&dd->active_time, 0);
	dd->eep_hrs = ifp->if_powerhour[0] | (ifp->if_powerhour[1] << 8);

done:
	vfree(buf);

bail:;
}

/**
 * qib_update_eeprom_log - copy active-time and error counters to eeprom
 * @dd: the qlogic_ib device
 *
 * Although the time is kept as seconds in the qib_devdata struct, it is
 * rounded to hours for re-write, as we have only 16 bits in EEPROM.
 * First-cut code reads whole (expected) struct qib_flash, modifies,
 * re-writes. Future direction: read/write only what we need, assuming
 * that the EEPROM had to have been "good enough" for driver init, and
 * if not, we aren't making it worse.
 *
 */
int qib_update_eeprom_log(struct qib_devdata *dd)
{
	void *buf;
	struct qib_flash *ifp;
	int len, hi_water;
	uint32_t new_time, new_hrs;
	u8 csum;
	int ret, idx;
	unsigned long flags;

	/* first, check if we actually need to do anything. */
	ret = 0;
	for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
		if (dd->eep_st_new_errs[idx]) {
			ret = 1;
			break;
		}
	}
	new_time = atomic_read(&dd->active_time);

	if (ret == 0 && new_time < 3600)
		goto bail;

	/*
	 * The quick-check above determined that there is something worthy
	 * of logging, so get current contents and do a more detailed idea.
	 * read full flash, not just currently used part, since it may have
	 * been written with a newer definition
	 */
	len = sizeof(struct qib_flash);
	buf = vmalloc(len);
	ret = 1;
	if (!buf) {
		qib_dev_err(dd, "Couldn't allocate memory to read %u "
			    "bytes from eeprom for logging\n", len);
		goto bail;
	}

	/* Grab semaphore and read current EEPROM. If we get an
	 * error, let go, but if not, keep it until we finish write.
	 */
	ret = mutex_lock_interruptible(&dd->eep_lock);
	if (ret) {
		qib_dev_err(dd, "Unable to acquire EEPROM for logging\n");
		goto free_bail;
	}
	ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev, 0, buf, len);
	if (ret) {
		mutex_unlock(&dd->eep_lock);
		qib_dev_err(dd, "Unable read EEPROM for logging\n");
		goto free_bail;
	}
	ifp = (struct qib_flash *)buf;

	csum = flash_csum(ifp, 0);
	if (csum != ifp->if_csum) {
		mutex_unlock(&dd->eep_lock);
		qib_dev_err(dd, "EEPROM cks err (0x%02X, S/B 0x%02X)\n",
			    csum, ifp->if_csum);
		ret = 1;
		goto free_bail;
	}
	hi_water = 0;
	spin_lock_irqsave(&dd->eep_st_lock, flags);
	for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
		int new_val = dd->eep_st_new_errs[idx];
		if (new_val) {
			/*
			 * If we have seen any errors, add to EEPROM values
			 * We need to saturate at 0xFF (255) and we also
			 * would need to adjust the checksum if we were
			 * trying to minimize EEPROM traffic
			 * Note that we add to actual current count in EEPROM,
			 * in case it was altered while we were running.
			 */
			new_val += ifp->if_errcntp[idx];
			if (new_val > 0xFF)
				new_val = 0xFF;
			if (ifp->if_errcntp[idx] != new_val) {
				ifp->if_errcntp[idx] = new_val;
				hi_water = offsetof(struct qib_flash,
						    if_errcntp) + idx;
			}
			/*
			 * update our shadow (used to minimize EEPROM
			 * traffic), to match what we are about to write.
			 */
			dd->eep_st_errs[idx] = new_val;
			dd->eep_st_new_errs[idx] = 0;
		}
	}
	/*
	 * Now update active-time. We would like to round to the nearest hour
	 * but unless atomic_t are sure to be proper signed ints we cannot,
	 * because we need to account for what we "transfer" to EEPROM and
	 * if we log an hour at 31 minutes, then we would need to set
	 * active_time to -29 to accurately count the _next_ hour.
	 */
	if (new_time >= 3600) {
		new_hrs = new_time / 3600;
		atomic_sub((new_hrs * 3600), &dd->active_time);
		new_hrs += dd->eep_hrs;
		if (new_hrs > 0xFFFF)
			new_hrs = 0xFFFF;
		dd->eep_hrs = new_hrs;
		if ((new_hrs & 0xFF) != ifp->if_powerhour[0]) {
			ifp->if_powerhour[0] = new_hrs & 0xFF;
			hi_water = offsetof(struct qib_flash, if_powerhour);
		}
		if ((new_hrs >> 8) != ifp->if_powerhour[1]) {
			ifp->if_powerhour[1] = new_hrs >> 8;
			hi_water = offsetof(struct qib_flash, if_powerhour) + 1;
		}
	}
	/*
	 * There is a tiny possibility that we could somehow fail to write
	 * the EEPROM after updating our shadows, but problems from holding
	 * the spinlock too long are a much bigger issue.
	 */
	spin_unlock_irqrestore(&dd->eep_st_lock, flags);
	if (hi_water) {
		/* we made some change to the data, uopdate cksum and write */
		csum = flash_csum(ifp, 1);
		ret = eeprom_write_with_enable(dd, 0, buf, hi_water + 1);
	}
	mutex_unlock(&dd->eep_lock);
	if (ret)
		qib_dev_err(dd, "Failed updating EEPROM\n");

free_bail:
	vfree(buf);
bail:
	return ret;
}

/**
 * qib_inc_eeprom_err - increment one of the four error counters
 * that are logged to EEPROM.
 * @dd: the qlogic_ib device
 * @eidx: 0..3, the counter to increment
 * @incr: how much to add
 *
 * Each counter is 8-bits, and saturates at 255 (0xFF). They
 * are copied to the EEPROM (aka flash) whenever qib_update_eeprom_log()
 * is called, but it can only be called in a context that allows sleep.
 * This function can be called even at interrupt level.
 */
void qib_inc_eeprom_err(struct qib_devdata *dd, u32 eidx, u32 incr)
{
	uint new_val;
	unsigned long flags;

	spin_lock_irqsave(&dd->eep_st_lock, flags);
	new_val = dd->eep_st_new_errs[eidx] + incr;
	if (new_val > 255)
		new_val = 255;
	dd->eep_st_new_errs[eidx] = new_val;
	spin_unlock_irqrestore(&dd->eep_st_lock, flags);
}