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1/*
2 * Copyright (c) 2012 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
4 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35#include <linux/delay.h>
36#include <linux/pci.h>
37#include <linux/vmalloc.h>
38
39#include "qib.h"
40
41/*
42 * Functions specific to the serial EEPROM on cards handled by ib_qib.
43 * The actual serail interface code is in qib_twsi.c. This file is a client
44 */
45
46/**
47 * qib_eeprom_read - receives bytes from the eeprom via I2C
48 * @dd: the qlogic_ib device
49 * @eeprom_offset: address to read from
50 * @buff: where to store result
51 * @len: number of bytes to receive
52 */
53int qib_eeprom_read(struct qib_devdata *dd, u8 eeprom_offset,
54 void *buff, int len)
55{
56 int ret;
57
58 ret = mutex_lock_interruptible(&dd->eep_lock);
59 if (!ret) {
60 ret = qib_twsi_reset(dd);
61 if (ret)
62 qib_dev_err(dd, "EEPROM Reset for read failed\n");
63 else
64 ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev,
65 eeprom_offset, buff, len);
66 mutex_unlock(&dd->eep_lock);
67 }
68
69 return ret;
70}
71
72/*
73 * Actually update the eeprom, first doing write enable if
74 * needed, then restoring write enable state.
75 * Must be called with eep_lock held
76 */
77static int eeprom_write_with_enable(struct qib_devdata *dd, u8 offset,
78 const void *buf, int len)
79{
80 int ret, pwen;
81
82 pwen = dd->f_eeprom_wen(dd, 1);
83 ret = qib_twsi_reset(dd);
84 if (ret)
85 qib_dev_err(dd, "EEPROM Reset for write failed\n");
86 else
87 ret = qib_twsi_blk_wr(dd, dd->twsi_eeprom_dev,
88 offset, buf, len);
89 dd->f_eeprom_wen(dd, pwen);
90 return ret;
91}
92
93/**
94 * qib_eeprom_write - writes data to the eeprom via I2C
95 * @dd: the qlogic_ib device
96 * @eeprom_offset: where to place data
97 * @buff: data to write
98 * @len: number of bytes to write
99 */
100int qib_eeprom_write(struct qib_devdata *dd, u8 eeprom_offset,
101 const void *buff, int len)
102{
103 int ret;
104
105 ret = mutex_lock_interruptible(&dd->eep_lock);
106 if (!ret) {
107 ret = eeprom_write_with_enable(dd, eeprom_offset, buff, len);
108 mutex_unlock(&dd->eep_lock);
109 }
110
111 return ret;
112}
113
114static u8 flash_csum(struct qib_flash *ifp, int adjust)
115{
116 u8 *ip = (u8 *) ifp;
117 u8 csum = 0, len;
118
119 /*
120 * Limit length checksummed to max length of actual data.
121 * Checksum of erased eeprom will still be bad, but we avoid
122 * reading past the end of the buffer we were passed.
123 */
124 len = ifp->if_length;
125 if (len > sizeof(struct qib_flash))
126 len = sizeof(struct qib_flash);
127 while (len--)
128 csum += *ip++;
129 csum -= ifp->if_csum;
130 csum = ~csum;
131 if (adjust)
132 ifp->if_csum = csum;
133
134 return csum;
135}
136
137/**
138 * qib_get_eeprom_info- get the GUID et al. from the TSWI EEPROM device
139 * @dd: the qlogic_ib device
140 *
141 * We have the capability to use the nguid field, and get
142 * the guid from the first chip's flash, to use for all of them.
143 */
144void qib_get_eeprom_info(struct qib_devdata *dd)
145{
146 void *buf;
147 struct qib_flash *ifp;
148 __be64 guid;
149 int len, eep_stat;
150 u8 csum, *bguid;
151 int t = dd->unit;
152 struct qib_devdata *dd0 = qib_lookup(0);
153
154 if (t && dd0->nguid > 1 && t <= dd0->nguid) {
155 u8 oguid;
156
157 dd->base_guid = dd0->base_guid;
158 bguid = (u8 *) &dd->base_guid;
159
160 oguid = bguid[7];
161 bguid[7] += t;
162 if (oguid > bguid[7]) {
163 if (bguid[6] == 0xff) {
164 if (bguid[5] == 0xff) {
165 qib_dev_err(dd,
166 "Can't set GUID from base, wraps to OUI!\n");
167 dd->base_guid = 0;
168 goto bail;
169 }
170 bguid[5]++;
171 }
172 bguid[6]++;
173 }
174 dd->nguid = 1;
175 goto bail;
176 }
177
178 /*
179 * Read full flash, not just currently used part, since it may have
180 * been written with a newer definition.
181 * */
182 len = sizeof(struct qib_flash);
183 buf = vmalloc(len);
184 if (!buf)
185 goto bail;
186
187 /*
188 * Use "public" eeprom read function, which does locking and
189 * figures out device. This will migrate to chip-specific.
190 */
191 eep_stat = qib_eeprom_read(dd, 0, buf, len);
192
193 if (eep_stat) {
194 qib_dev_err(dd, "Failed reading GUID from eeprom\n");
195 goto done;
196 }
197 ifp = (struct qib_flash *)buf;
198
199 csum = flash_csum(ifp, 0);
200 if (csum != ifp->if_csum) {
201 qib_devinfo(dd->pcidev,
202 "Bad I2C flash checksum: 0x%x, not 0x%x\n",
203 csum, ifp->if_csum);
204 goto done;
205 }
206 if (*(__be64 *) ifp->if_guid == cpu_to_be64(0) ||
207 *(__be64 *) ifp->if_guid == ~cpu_to_be64(0)) {
208 qib_dev_err(dd,
209 "Invalid GUID %llx from flash; ignoring\n",
210 *(unsigned long long *) ifp->if_guid);
211 /* don't allow GUID if all 0 or all 1's */
212 goto done;
213 }
214
215 /* complain, but allow it */
216 if (*(u64 *) ifp->if_guid == 0x100007511000000ULL)
217 qib_devinfo(dd->pcidev,
218 "Warning, GUID %llx is default, probably not correct!\n",
219 *(unsigned long long *) ifp->if_guid);
220
221 bguid = ifp->if_guid;
222 if (!bguid[0] && !bguid[1] && !bguid[2]) {
223 /*
224 * Original incorrect GUID format in flash; fix in
225 * core copy, by shifting up 2 octets; don't need to
226 * change top octet, since both it and shifted are 0.
227 */
228 bguid[1] = bguid[3];
229 bguid[2] = bguid[4];
230 bguid[3] = 0;
231 bguid[4] = 0;
232 guid = *(__be64 *) ifp->if_guid;
233 } else
234 guid = *(__be64 *) ifp->if_guid;
235 dd->base_guid = guid;
236 dd->nguid = ifp->if_numguid;
237 /*
238 * Things are slightly complicated by the desire to transparently
239 * support both the Pathscale 10-digit serial number and the QLogic
240 * 13-character version.
241 */
242 if ((ifp->if_fversion > 1) && ifp->if_sprefix[0] &&
243 ((u8 *) ifp->if_sprefix)[0] != 0xFF) {
244 char *snp = dd->serial;
245
246 /*
247 * This board has a Serial-prefix, which is stored
248 * elsewhere for backward-compatibility.
249 */
250 memcpy(snp, ifp->if_sprefix, sizeof(ifp->if_sprefix));
251 snp[sizeof(ifp->if_sprefix)] = '\0';
252 len = strlen(snp);
253 snp += len;
254 len = sizeof(dd->serial) - len;
255 if (len > sizeof(ifp->if_serial))
256 len = sizeof(ifp->if_serial);
257 memcpy(snp, ifp->if_serial, len);
258 } else {
259 memcpy(dd->serial, ifp->if_serial, sizeof(ifp->if_serial));
260 }
261 if (!strstr(ifp->if_comment, "Tested successfully"))
262 qib_dev_err(dd,
263 "Board SN %s did not pass functional test: %s\n",
264 dd->serial, ifp->if_comment);
265
266done:
267 vfree(buf);
268
269bail:;
270}
271
1/*
2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/delay.h>
35#include <linux/pci.h>
36#include <linux/vmalloc.h>
37
38#include "qib.h"
39
40/*
41 * Functions specific to the serial EEPROM on cards handled by ib_qib.
42 * The actual serail interface code is in qib_twsi.c. This file is a client
43 */
44
45/**
46 * qib_eeprom_read - receives bytes from the eeprom via I2C
47 * @dd: the qlogic_ib device
48 * @eeprom_offset: address to read from
49 * @buffer: where to store result
50 * @len: number of bytes to receive
51 */
52int qib_eeprom_read(struct qib_devdata *dd, u8 eeprom_offset,
53 void *buff, int len)
54{
55 int ret;
56
57 ret = mutex_lock_interruptible(&dd->eep_lock);
58 if (!ret) {
59 ret = qib_twsi_reset(dd);
60 if (ret)
61 qib_dev_err(dd, "EEPROM Reset for read failed\n");
62 else
63 ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev,
64 eeprom_offset, buff, len);
65 mutex_unlock(&dd->eep_lock);
66 }
67
68 return ret;
69}
70
71/*
72 * Actually update the eeprom, first doing write enable if
73 * needed, then restoring write enable state.
74 * Must be called with eep_lock held
75 */
76static int eeprom_write_with_enable(struct qib_devdata *dd, u8 offset,
77 const void *buf, int len)
78{
79 int ret, pwen;
80
81 pwen = dd->f_eeprom_wen(dd, 1);
82 ret = qib_twsi_reset(dd);
83 if (ret)
84 qib_dev_err(dd, "EEPROM Reset for write failed\n");
85 else
86 ret = qib_twsi_blk_wr(dd, dd->twsi_eeprom_dev,
87 offset, buf, len);
88 dd->f_eeprom_wen(dd, pwen);
89 return ret;
90}
91
92/**
93 * qib_eeprom_write - writes data to the eeprom via I2C
94 * @dd: the qlogic_ib device
95 * @eeprom_offset: where to place data
96 * @buffer: data to write
97 * @len: number of bytes to write
98 */
99int qib_eeprom_write(struct qib_devdata *dd, u8 eeprom_offset,
100 const void *buff, int len)
101{
102 int ret;
103
104 ret = mutex_lock_interruptible(&dd->eep_lock);
105 if (!ret) {
106 ret = eeprom_write_with_enable(dd, eeprom_offset, buff, len);
107 mutex_unlock(&dd->eep_lock);
108 }
109
110 return ret;
111}
112
113static u8 flash_csum(struct qib_flash *ifp, int adjust)
114{
115 u8 *ip = (u8 *) ifp;
116 u8 csum = 0, len;
117
118 /*
119 * Limit length checksummed to max length of actual data.
120 * Checksum of erased eeprom will still be bad, but we avoid
121 * reading past the end of the buffer we were passed.
122 */
123 len = ifp->if_length;
124 if (len > sizeof(struct qib_flash))
125 len = sizeof(struct qib_flash);
126 while (len--)
127 csum += *ip++;
128 csum -= ifp->if_csum;
129 csum = ~csum;
130 if (adjust)
131 ifp->if_csum = csum;
132
133 return csum;
134}
135
136/**
137 * qib_get_eeprom_info- get the GUID et al. from the TSWI EEPROM device
138 * @dd: the qlogic_ib device
139 *
140 * We have the capability to use the nguid field, and get
141 * the guid from the first chip's flash, to use for all of them.
142 */
143void qib_get_eeprom_info(struct qib_devdata *dd)
144{
145 void *buf;
146 struct qib_flash *ifp;
147 __be64 guid;
148 int len, eep_stat;
149 u8 csum, *bguid;
150 int t = dd->unit;
151 struct qib_devdata *dd0 = qib_lookup(0);
152
153 if (t && dd0->nguid > 1 && t <= dd0->nguid) {
154 u8 oguid;
155 dd->base_guid = dd0->base_guid;
156 bguid = (u8 *) &dd->base_guid;
157
158 oguid = bguid[7];
159 bguid[7] += t;
160 if (oguid > bguid[7]) {
161 if (bguid[6] == 0xff) {
162 if (bguid[5] == 0xff) {
163 qib_dev_err(dd, "Can't set %s GUID"
164 " from base, wraps to"
165 " OUI!\n",
166 qib_get_unit_name(t));
167 dd->base_guid = 0;
168 goto bail;
169 }
170 bguid[5]++;
171 }
172 bguid[6]++;
173 }
174 dd->nguid = 1;
175 goto bail;
176 }
177
178 /*
179 * Read full flash, not just currently used part, since it may have
180 * been written with a newer definition.
181 * */
182 len = sizeof(struct qib_flash);
183 buf = vmalloc(len);
184 if (!buf) {
185 qib_dev_err(dd, "Couldn't allocate memory to read %u "
186 "bytes from eeprom for GUID\n", len);
187 goto bail;
188 }
189
190 /*
191 * Use "public" eeprom read function, which does locking and
192 * figures out device. This will migrate to chip-specific.
193 */
194 eep_stat = qib_eeprom_read(dd, 0, buf, len);
195
196 if (eep_stat) {
197 qib_dev_err(dd, "Failed reading GUID from eeprom\n");
198 goto done;
199 }
200 ifp = (struct qib_flash *)buf;
201
202 csum = flash_csum(ifp, 0);
203 if (csum != ifp->if_csum) {
204 qib_devinfo(dd->pcidev, "Bad I2C flash checksum: "
205 "0x%x, not 0x%x\n", csum, ifp->if_csum);
206 goto done;
207 }
208 if (*(__be64 *) ifp->if_guid == cpu_to_be64(0) ||
209 *(__be64 *) ifp->if_guid == ~cpu_to_be64(0)) {
210 qib_dev_err(dd, "Invalid GUID %llx from flash; ignoring\n",
211 *(unsigned long long *) ifp->if_guid);
212 /* don't allow GUID if all 0 or all 1's */
213 goto done;
214 }
215
216 /* complain, but allow it */
217 if (*(u64 *) ifp->if_guid == 0x100007511000000ULL)
218 qib_devinfo(dd->pcidev, "Warning, GUID %llx is "
219 "default, probably not correct!\n",
220 *(unsigned long long *) ifp->if_guid);
221
222 bguid = ifp->if_guid;
223 if (!bguid[0] && !bguid[1] && !bguid[2]) {
224 /*
225 * Original incorrect GUID format in flash; fix in
226 * core copy, by shifting up 2 octets; don't need to
227 * change top octet, since both it and shifted are 0.
228 */
229 bguid[1] = bguid[3];
230 bguid[2] = bguid[4];
231 bguid[3] = 0;
232 bguid[4] = 0;
233 guid = *(__be64 *) ifp->if_guid;
234 } else
235 guid = *(__be64 *) ifp->if_guid;
236 dd->base_guid = guid;
237 dd->nguid = ifp->if_numguid;
238 /*
239 * Things are slightly complicated by the desire to transparently
240 * support both the Pathscale 10-digit serial number and the QLogic
241 * 13-character version.
242 */
243 if ((ifp->if_fversion > 1) && ifp->if_sprefix[0] &&
244 ((u8 *) ifp->if_sprefix)[0] != 0xFF) {
245 char *snp = dd->serial;
246
247 /*
248 * This board has a Serial-prefix, which is stored
249 * elsewhere for backward-compatibility.
250 */
251 memcpy(snp, ifp->if_sprefix, sizeof ifp->if_sprefix);
252 snp[sizeof ifp->if_sprefix] = '\0';
253 len = strlen(snp);
254 snp += len;
255 len = (sizeof dd->serial) - len;
256 if (len > sizeof ifp->if_serial)
257 len = sizeof ifp->if_serial;
258 memcpy(snp, ifp->if_serial, len);
259 } else
260 memcpy(dd->serial, ifp->if_serial,
261 sizeof ifp->if_serial);
262 if (!strstr(ifp->if_comment, "Tested successfully"))
263 qib_dev_err(dd, "Board SN %s did not pass functional "
264 "test: %s\n", dd->serial, ifp->if_comment);
265
266 memcpy(&dd->eep_st_errs, &ifp->if_errcntp, QIB_EEP_LOG_CNT);
267 /*
268 * Power-on (actually "active") hours are kept as little-endian value
269 * in EEPROM, but as seconds in a (possibly as small as 24-bit)
270 * atomic_t while running.
271 */
272 atomic_set(&dd->active_time, 0);
273 dd->eep_hrs = ifp->if_powerhour[0] | (ifp->if_powerhour[1] << 8);
274
275done:
276 vfree(buf);
277
278bail:;
279}
280
281/**
282 * qib_update_eeprom_log - copy active-time and error counters to eeprom
283 * @dd: the qlogic_ib device
284 *
285 * Although the time is kept as seconds in the qib_devdata struct, it is
286 * rounded to hours for re-write, as we have only 16 bits in EEPROM.
287 * First-cut code reads whole (expected) struct qib_flash, modifies,
288 * re-writes. Future direction: read/write only what we need, assuming
289 * that the EEPROM had to have been "good enough" for driver init, and
290 * if not, we aren't making it worse.
291 *
292 */
293int qib_update_eeprom_log(struct qib_devdata *dd)
294{
295 void *buf;
296 struct qib_flash *ifp;
297 int len, hi_water;
298 uint32_t new_time, new_hrs;
299 u8 csum;
300 int ret, idx;
301 unsigned long flags;
302
303 /* first, check if we actually need to do anything. */
304 ret = 0;
305 for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
306 if (dd->eep_st_new_errs[idx]) {
307 ret = 1;
308 break;
309 }
310 }
311 new_time = atomic_read(&dd->active_time);
312
313 if (ret == 0 && new_time < 3600)
314 goto bail;
315
316 /*
317 * The quick-check above determined that there is something worthy
318 * of logging, so get current contents and do a more detailed idea.
319 * read full flash, not just currently used part, since it may have
320 * been written with a newer definition
321 */
322 len = sizeof(struct qib_flash);
323 buf = vmalloc(len);
324 ret = 1;
325 if (!buf) {
326 qib_dev_err(dd, "Couldn't allocate memory to read %u "
327 "bytes from eeprom for logging\n", len);
328 goto bail;
329 }
330
331 /* Grab semaphore and read current EEPROM. If we get an
332 * error, let go, but if not, keep it until we finish write.
333 */
334 ret = mutex_lock_interruptible(&dd->eep_lock);
335 if (ret) {
336 qib_dev_err(dd, "Unable to acquire EEPROM for logging\n");
337 goto free_bail;
338 }
339 ret = qib_twsi_blk_rd(dd, dd->twsi_eeprom_dev, 0, buf, len);
340 if (ret) {
341 mutex_unlock(&dd->eep_lock);
342 qib_dev_err(dd, "Unable read EEPROM for logging\n");
343 goto free_bail;
344 }
345 ifp = (struct qib_flash *)buf;
346
347 csum = flash_csum(ifp, 0);
348 if (csum != ifp->if_csum) {
349 mutex_unlock(&dd->eep_lock);
350 qib_dev_err(dd, "EEPROM cks err (0x%02X, S/B 0x%02X)\n",
351 csum, ifp->if_csum);
352 ret = 1;
353 goto free_bail;
354 }
355 hi_water = 0;
356 spin_lock_irqsave(&dd->eep_st_lock, flags);
357 for (idx = 0; idx < QIB_EEP_LOG_CNT; ++idx) {
358 int new_val = dd->eep_st_new_errs[idx];
359 if (new_val) {
360 /*
361 * If we have seen any errors, add to EEPROM values
362 * We need to saturate at 0xFF (255) and we also
363 * would need to adjust the checksum if we were
364 * trying to minimize EEPROM traffic
365 * Note that we add to actual current count in EEPROM,
366 * in case it was altered while we were running.
367 */
368 new_val += ifp->if_errcntp[idx];
369 if (new_val > 0xFF)
370 new_val = 0xFF;
371 if (ifp->if_errcntp[idx] != new_val) {
372 ifp->if_errcntp[idx] = new_val;
373 hi_water = offsetof(struct qib_flash,
374 if_errcntp) + idx;
375 }
376 /*
377 * update our shadow (used to minimize EEPROM
378 * traffic), to match what we are about to write.
379 */
380 dd->eep_st_errs[idx] = new_val;
381 dd->eep_st_new_errs[idx] = 0;
382 }
383 }
384 /*
385 * Now update active-time. We would like to round to the nearest hour
386 * but unless atomic_t are sure to be proper signed ints we cannot,
387 * because we need to account for what we "transfer" to EEPROM and
388 * if we log an hour at 31 minutes, then we would need to set
389 * active_time to -29 to accurately count the _next_ hour.
390 */
391 if (new_time >= 3600) {
392 new_hrs = new_time / 3600;
393 atomic_sub((new_hrs * 3600), &dd->active_time);
394 new_hrs += dd->eep_hrs;
395 if (new_hrs > 0xFFFF)
396 new_hrs = 0xFFFF;
397 dd->eep_hrs = new_hrs;
398 if ((new_hrs & 0xFF) != ifp->if_powerhour[0]) {
399 ifp->if_powerhour[0] = new_hrs & 0xFF;
400 hi_water = offsetof(struct qib_flash, if_powerhour);
401 }
402 if ((new_hrs >> 8) != ifp->if_powerhour[1]) {
403 ifp->if_powerhour[1] = new_hrs >> 8;
404 hi_water = offsetof(struct qib_flash, if_powerhour) + 1;
405 }
406 }
407 /*
408 * There is a tiny possibility that we could somehow fail to write
409 * the EEPROM after updating our shadows, but problems from holding
410 * the spinlock too long are a much bigger issue.
411 */
412 spin_unlock_irqrestore(&dd->eep_st_lock, flags);
413 if (hi_water) {
414 /* we made some change to the data, uopdate cksum and write */
415 csum = flash_csum(ifp, 1);
416 ret = eeprom_write_with_enable(dd, 0, buf, hi_water + 1);
417 }
418 mutex_unlock(&dd->eep_lock);
419 if (ret)
420 qib_dev_err(dd, "Failed updating EEPROM\n");
421
422free_bail:
423 vfree(buf);
424bail:
425 return ret;
426}
427
428/**
429 * qib_inc_eeprom_err - increment one of the four error counters
430 * that are logged to EEPROM.
431 * @dd: the qlogic_ib device
432 * @eidx: 0..3, the counter to increment
433 * @incr: how much to add
434 *
435 * Each counter is 8-bits, and saturates at 255 (0xFF). They
436 * are copied to the EEPROM (aka flash) whenever qib_update_eeprom_log()
437 * is called, but it can only be called in a context that allows sleep.
438 * This function can be called even at interrupt level.
439 */
440void qib_inc_eeprom_err(struct qib_devdata *dd, u32 eidx, u32 incr)
441{
442 uint new_val;
443 unsigned long flags;
444
445 spin_lock_irqsave(&dd->eep_st_lock, flags);
446 new_val = dd->eep_st_new_errs[eidx] + incr;
447 if (new_val > 255)
448 new_val = 255;
449 dd->eep_st_new_errs[eidx] = new_val;
450 spin_unlock_irqrestore(&dd->eep_st_lock, flags);
451}