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1/*
2 * linux/drivers/spi/spi-loopback-test.c
3 *
4 * (c) Martin Sperl <kernel@martin.sperl.org>
5 *
6 * Loopback test driver to test several typical spi_message conditions
7 * that a spi_master driver may encounter
8 * this can also get used for regression testing
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21#include <linux/delay.h>
22#include <linux/kernel.h>
23#include <linux/ktime.h>
24#include <linux/list.h>
25#include <linux/list_sort.h>
26#include <linux/module.h>
27#include <linux/of_device.h>
28#include <linux/printk.h>
29#include <linux/vmalloc.h>
30#include <linux/spi/spi.h>
31
32#include "spi-test.h"
33
34/* flag to only simulate transfers */
35static int simulate_only;
36module_param(simulate_only, int, 0);
37MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message");
38
39/* dump spi messages */
40static int dump_messages;
41module_param(dump_messages, int, 0);
42MODULE_PARM_DESC(dump_messages,
43 "=1 dump the basic spi_message_structure, " \
44 "=2 dump the spi_message_structure including data, " \
45 "=3 dump the spi_message structure before and after execution");
46/* the device is jumpered for loopback - enabling some rx_buf tests */
47static int loopback;
48module_param(loopback, int, 0);
49MODULE_PARM_DESC(loopback,
50 "if set enable loopback mode, where the rx_buf " \
51 "is checked to match tx_buf after the spi_message " \
52 "is executed");
53
54static int loop_req;
55module_param(loop_req, int, 0);
56MODULE_PARM_DESC(loop_req,
57 "if set controller will be asked to enable test loop mode. " \
58 "If controller supported it, MISO and MOSI will be connected");
59
60static int no_cs;
61module_param(no_cs, int, 0);
62MODULE_PARM_DESC(no_cs,
63 "if set Chip Select (CS) will not be used");
64
65/* run only a specific test */
66static int run_only_test = -1;
67module_param(run_only_test, int, 0);
68MODULE_PARM_DESC(run_only_test,
69 "only run the test with this number (0-based !)");
70
71/* use vmalloc'ed buffers */
72static int use_vmalloc;
73module_param(use_vmalloc, int, 0644);
74MODULE_PARM_DESC(use_vmalloc,
75 "use vmalloc'ed buffers instead of kmalloc'ed");
76
77/* check rx ranges */
78static int check_ranges = 1;
79module_param(check_ranges, int, 0644);
80MODULE_PARM_DESC(check_ranges,
81 "checks rx_buffer pattern are valid");
82
83/* the actual tests to execute */
84static struct spi_test spi_tests[] = {
85 {
86 .description = "tx/rx-transfer - start of page",
87 .fill_option = FILL_COUNT_8,
88 .iterate_len = { ITERATE_MAX_LEN },
89 .iterate_tx_align = ITERATE_ALIGN,
90 .iterate_rx_align = ITERATE_ALIGN,
91 .transfer_count = 1,
92 .transfers = {
93 {
94 .tx_buf = TX(0),
95 .rx_buf = RX(0),
96 },
97 },
98 },
99 {
100 .description = "tx/rx-transfer - crossing PAGE_SIZE",
101 .fill_option = FILL_COUNT_8,
102 .iterate_len = { ITERATE_MAX_LEN },
103 .iterate_tx_align = ITERATE_ALIGN,
104 .iterate_rx_align = ITERATE_ALIGN,
105 .transfer_count = 1,
106 .transfers = {
107 {
108 .tx_buf = TX(PAGE_SIZE - 4),
109 .rx_buf = RX(PAGE_SIZE - 4),
110 },
111 },
112 },
113 {
114 .description = "tx-transfer - only",
115 .fill_option = FILL_COUNT_8,
116 .iterate_len = { ITERATE_MAX_LEN },
117 .iterate_tx_align = ITERATE_ALIGN,
118 .transfer_count = 1,
119 .transfers = {
120 {
121 .tx_buf = TX(0),
122 },
123 },
124 },
125 {
126 .description = "rx-transfer - only",
127 .fill_option = FILL_COUNT_8,
128 .iterate_len = { ITERATE_MAX_LEN },
129 .iterate_rx_align = ITERATE_ALIGN,
130 .transfer_count = 1,
131 .transfers = {
132 {
133 .rx_buf = RX(0),
134 },
135 },
136 },
137 {
138 .description = "two tx-transfers - alter both",
139 .fill_option = FILL_COUNT_8,
140 .iterate_len = { ITERATE_LEN },
141 .iterate_tx_align = ITERATE_ALIGN,
142 .iterate_transfer_mask = BIT(0) | BIT(1),
143 .transfer_count = 2,
144 .transfers = {
145 {
146 .tx_buf = TX(0),
147 },
148 {
149 /* this is why we cant use ITERATE_MAX_LEN */
150 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
151 },
152 },
153 },
154 {
155 .description = "two tx-transfers - alter first",
156 .fill_option = FILL_COUNT_8,
157 .iterate_len = { ITERATE_MAX_LEN },
158 .iterate_tx_align = ITERATE_ALIGN,
159 .iterate_transfer_mask = BIT(0),
160 .transfer_count = 2,
161 .transfers = {
162 {
163 .tx_buf = TX(64),
164 },
165 {
166 .len = 1,
167 .tx_buf = TX(0),
168 },
169 },
170 },
171 {
172 .description = "two tx-transfers - alter second",
173 .fill_option = FILL_COUNT_8,
174 .iterate_len = { ITERATE_MAX_LEN },
175 .iterate_tx_align = ITERATE_ALIGN,
176 .iterate_transfer_mask = BIT(1),
177 .transfer_count = 2,
178 .transfers = {
179 {
180 .len = 16,
181 .tx_buf = TX(0),
182 },
183 {
184 .tx_buf = TX(64),
185 },
186 },
187 },
188 {
189 .description = "two transfers tx then rx - alter both",
190 .fill_option = FILL_COUNT_8,
191 .iterate_len = { ITERATE_MAX_LEN },
192 .iterate_tx_align = ITERATE_ALIGN,
193 .iterate_transfer_mask = BIT(0) | BIT(1),
194 .transfer_count = 2,
195 .transfers = {
196 {
197 .tx_buf = TX(0),
198 },
199 {
200 .rx_buf = RX(0),
201 },
202 },
203 },
204 {
205 .description = "two transfers tx then rx - alter tx",
206 .fill_option = FILL_COUNT_8,
207 .iterate_len = { ITERATE_MAX_LEN },
208 .iterate_tx_align = ITERATE_ALIGN,
209 .iterate_transfer_mask = BIT(0),
210 .transfer_count = 2,
211 .transfers = {
212 {
213 .tx_buf = TX(0),
214 },
215 {
216 .len = 1,
217 .rx_buf = RX(0),
218 },
219 },
220 },
221 {
222 .description = "two transfers tx then rx - alter rx",
223 .fill_option = FILL_COUNT_8,
224 .iterate_len = { ITERATE_MAX_LEN },
225 .iterate_tx_align = ITERATE_ALIGN,
226 .iterate_transfer_mask = BIT(1),
227 .transfer_count = 2,
228 .transfers = {
229 {
230 .len = 1,
231 .tx_buf = TX(0),
232 },
233 {
234 .rx_buf = RX(0),
235 },
236 },
237 },
238 {
239 .description = "two tx+rx transfers - alter both",
240 .fill_option = FILL_COUNT_8,
241 .iterate_len = { ITERATE_LEN },
242 .iterate_tx_align = ITERATE_ALIGN,
243 .iterate_transfer_mask = BIT(0) | BIT(1),
244 .transfer_count = 2,
245 .transfers = {
246 {
247 .tx_buf = TX(0),
248 .rx_buf = RX(0),
249 },
250 {
251 /* making sure we align without overwrite
252 * the reason we can not use ITERATE_MAX_LEN
253 */
254 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
255 .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF),
256 },
257 },
258 },
259 {
260 .description = "two tx+rx transfers - alter first",
261 .fill_option = FILL_COUNT_8,
262 .iterate_len = { ITERATE_MAX_LEN },
263 .iterate_tx_align = ITERATE_ALIGN,
264 .iterate_transfer_mask = BIT(0),
265 .transfer_count = 2,
266 .transfers = {
267 {
268 /* making sure we align without overwrite */
269 .tx_buf = TX(1024),
270 .rx_buf = RX(1024),
271 },
272 {
273 .len = 1,
274 /* making sure we align without overwrite */
275 .tx_buf = TX(0),
276 .rx_buf = RX(0),
277 },
278 },
279 },
280 {
281 .description = "two tx+rx transfers - alter second",
282 .fill_option = FILL_COUNT_8,
283 .iterate_len = { ITERATE_MAX_LEN },
284 .iterate_tx_align = ITERATE_ALIGN,
285 .iterate_transfer_mask = BIT(1),
286 .transfer_count = 2,
287 .transfers = {
288 {
289 .len = 1,
290 .tx_buf = TX(0),
291 .rx_buf = RX(0),
292 },
293 {
294 /* making sure we align without overwrite */
295 .tx_buf = TX(1024),
296 .rx_buf = RX(1024),
297 },
298 },
299 },
300 {
301 .description = "two tx+rx transfers - delay after transfer",
302 .fill_option = FILL_COUNT_8,
303 .iterate_len = { ITERATE_MAX_LEN },
304 .iterate_transfer_mask = BIT(0) | BIT(1),
305 .transfer_count = 2,
306 .transfers = {
307 {
308 .tx_buf = TX(0),
309 .rx_buf = RX(0),
310 .delay_usecs = 1000,
311 },
312 {
313 .tx_buf = TX(0),
314 .rx_buf = RX(0),
315 .delay_usecs = 1000,
316 },
317 },
318 },
319
320 { /* end of tests sequence */ }
321};
322
323static int spi_loopback_test_probe(struct spi_device *spi)
324{
325 int ret;
326
327 if (loop_req || no_cs) {
328 spi->mode |= loop_req ? SPI_LOOP : 0;
329 spi->mode |= no_cs ? SPI_NO_CS : 0;
330 ret = spi_setup(spi);
331 if (ret) {
332 dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",
333 ret);
334 return ret;
335 }
336 }
337
338 dev_info(&spi->dev, "Executing spi-loopback-tests\n");
339
340 ret = spi_test_run_tests(spi, spi_tests);
341
342 dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
343 ret);
344
345 return ret;
346}
347
348/* non const match table to permit to change via a module parameter */
349static struct of_device_id spi_loopback_test_of_match[] = {
350 { .compatible = "linux,spi-loopback-test", },
351 { }
352};
353
354/* allow to override the compatible string via a module_parameter */
355module_param_string(compatible, spi_loopback_test_of_match[0].compatible,
356 sizeof(spi_loopback_test_of_match[0].compatible),
357 0000);
358
359MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
360
361static struct spi_driver spi_loopback_test_driver = {
362 .driver = {
363 .name = "spi-loopback-test",
364 .owner = THIS_MODULE,
365 .of_match_table = spi_loopback_test_of_match,
366 },
367 .probe = spi_loopback_test_probe,
368};
369
370module_spi_driver(spi_loopback_test_driver);
371
372MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
373MODULE_DESCRIPTION("test spi_driver to check core functionality");
374MODULE_LICENSE("GPL");
375
376/*-------------------------------------------------------------------------*/
377
378/* spi_test implementation */
379
380#define RANGE_CHECK(ptr, plen, start, slen) \
381 ((ptr >= start) && (ptr + plen <= start + slen))
382
383/* we allocate one page more, to allow for offsets */
384#define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
385
386static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
387{
388 /* limit the hex_dump */
389 if (len < 1024) {
390 print_hex_dump(KERN_INFO, pre,
391 DUMP_PREFIX_OFFSET, 16, 1,
392 ptr, len, 0);
393 return;
394 }
395 /* print head */
396 print_hex_dump(KERN_INFO, pre,
397 DUMP_PREFIX_OFFSET, 16, 1,
398 ptr, 512, 0);
399 /* print tail */
400 pr_info("%s truncated - continuing at offset %04zx\n",
401 pre, len - 512);
402 print_hex_dump(KERN_INFO, pre,
403 DUMP_PREFIX_OFFSET, 16, 1,
404 ptr + (len - 512), 512, 0);
405}
406
407static void spi_test_dump_message(struct spi_device *spi,
408 struct spi_message *msg,
409 bool dump_data)
410{
411 struct spi_transfer *xfer;
412 int i;
413 u8 b;
414
415 dev_info(&spi->dev, " spi_msg@%pK\n", msg);
416 if (msg->status)
417 dev_info(&spi->dev, " status: %i\n",
418 msg->status);
419 dev_info(&spi->dev, " frame_length: %i\n",
420 msg->frame_length);
421 dev_info(&spi->dev, " actual_length: %i\n",
422 msg->actual_length);
423
424 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
425 dev_info(&spi->dev, " spi_transfer@%pK\n", xfer);
426 dev_info(&spi->dev, " len: %i\n", xfer->len);
427 dev_info(&spi->dev, " tx_buf: %pK\n", xfer->tx_buf);
428 if (dump_data && xfer->tx_buf)
429 spi_test_print_hex_dump(" TX: ",
430 xfer->tx_buf,
431 xfer->len);
432
433 dev_info(&spi->dev, " rx_buf: %pK\n", xfer->rx_buf);
434 if (dump_data && xfer->rx_buf)
435 spi_test_print_hex_dump(" RX: ",
436 xfer->rx_buf,
437 xfer->len);
438 /* check for unwritten test pattern on rx_buf */
439 if (xfer->rx_buf) {
440 for (i = 0 ; i < xfer->len ; i++) {
441 b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i];
442 if (b != SPI_TEST_PATTERN_UNWRITTEN)
443 break;
444 }
445 if (i)
446 dev_info(&spi->dev,
447 " rx_buf filled with %02x starts at offset: %i\n",
448 SPI_TEST_PATTERN_UNWRITTEN,
449 xfer->len - i);
450 }
451 }
452}
453
454struct rx_ranges {
455 struct list_head list;
456 u8 *start;
457 u8 *end;
458};
459
460static int rx_ranges_cmp(void *priv, struct list_head *a, struct list_head *b)
461{
462 struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list);
463 struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list);
464
465 if (rx_a->start > rx_b->start)
466 return 1;
467 if (rx_a->start < rx_b->start)
468 return -1;
469 return 0;
470}
471
472static int spi_check_rx_ranges(struct spi_device *spi,
473 struct spi_message *msg,
474 void *rx)
475{
476 struct spi_transfer *xfer;
477 struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
478 int i = 0;
479 LIST_HEAD(ranges_list);
480 u8 *addr;
481 int ret = 0;
482
483 /* loop over all transfers to fill in the rx_ranges */
484 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
485 /* if there is no rx, then no check is needed */
486 if (!xfer->rx_buf)
487 continue;
488 /* fill in the rx_range */
489 if (RANGE_CHECK(xfer->rx_buf, xfer->len,
490 rx, SPI_TEST_MAX_SIZE_PLUS)) {
491 ranges[i].start = xfer->rx_buf;
492 ranges[i].end = xfer->rx_buf + xfer->len;
493 list_add(&ranges[i].list, &ranges_list);
494 i++;
495 }
496 }
497
498 /* if no ranges, then we can return and avoid the checks...*/
499 if (!i)
500 return 0;
501
502 /* sort the list */
503 list_sort(NULL, &ranges_list, rx_ranges_cmp);
504
505 /* and iterate over all the rx addresses */
506 for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) {
507 /* if we are the DO not write pattern,
508 * then continue with the loop...
509 */
510 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
511 continue;
512
513 /* check if we are inside a range */
514 list_for_each_entry(r, &ranges_list, list) {
515 /* if so then set to end... */
516 if ((addr >= r->start) && (addr < r->end))
517 addr = r->end;
518 }
519 /* second test after a (hopefull) translation */
520 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
521 continue;
522
523 /* if still not found then something has modified too much */
524 /* we could list the "closest" transfer here... */
525 dev_err(&spi->dev,
526 "loopback strangeness - rx changed outside of allowed range at: %pK\n",
527 addr);
528 /* do not return, only set ret,
529 * so that we list all addresses
530 */
531 ret = -ERANGE;
532 }
533
534 return ret;
535}
536
537static int spi_test_check_elapsed_time(struct spi_device *spi,
538 struct spi_test *test)
539{
540 int i;
541 unsigned long long estimated_time = 0;
542 unsigned long long delay_usecs = 0;
543
544 for (i = 0; i < test->transfer_count; i++) {
545 struct spi_transfer *xfer = test->transfers + i;
546 unsigned long long nbits = (unsigned long long)BITS_PER_BYTE *
547 xfer->len;
548
549 delay_usecs += xfer->delay_usecs;
550 if (!xfer->speed_hz)
551 continue;
552 estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz);
553 }
554
555 estimated_time += delay_usecs * NSEC_PER_USEC;
556 if (test->elapsed_time < estimated_time) {
557 dev_err(&spi->dev,
558 "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n",
559 test->elapsed_time, estimated_time);
560
561 return -EINVAL;
562 }
563
564 return 0;
565}
566
567static int spi_test_check_loopback_result(struct spi_device *spi,
568 struct spi_message *msg,
569 void *tx, void *rx)
570{
571 struct spi_transfer *xfer;
572 u8 rxb, txb;
573 size_t i;
574 int ret;
575
576 /* checks rx_buffer pattern are valid with loopback or without */
577 if (check_ranges) {
578 ret = spi_check_rx_ranges(spi, msg, rx);
579 if (ret)
580 return ret;
581 }
582
583 /* if we run without loopback, then return now */
584 if (!loopback)
585 return 0;
586
587 /* if applicable to transfer check that rx_buf is equal to tx_buf */
588 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
589 /* if there is no rx, then no check is needed */
590 if (!xfer->len || !xfer->rx_buf)
591 continue;
592 /* so depending on tx_buf we need to handle things */
593 if (xfer->tx_buf) {
594 for (i = 0; i < xfer->len; i++) {
595 txb = ((u8 *)xfer->tx_buf)[i];
596 rxb = ((u8 *)xfer->rx_buf)[i];
597 if (txb != rxb)
598 goto mismatch_error;
599 }
600 } else {
601 /* first byte received */
602 txb = ((u8 *)xfer->rx_buf)[0];
603 /* first byte may be 0 or xff */
604 if (!((txb == 0) || (txb == 0xff))) {
605 dev_err(&spi->dev,
606 "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
607 txb);
608 return -EINVAL;
609 }
610 /* check that all bytes are identical */
611 for (i = 1; i < xfer->len; i++) {
612 rxb = ((u8 *)xfer->rx_buf)[i];
613 if (rxb != txb)
614 goto mismatch_error;
615 }
616 }
617 }
618
619 return 0;
620
621mismatch_error:
622 dev_err(&spi->dev,
623 "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
624 i, txb, rxb);
625
626 return -EINVAL;
627}
628
629static int spi_test_translate(struct spi_device *spi,
630 void **ptr, size_t len,
631 void *tx, void *rx)
632{
633 size_t off;
634
635 /* return on null */
636 if (!*ptr)
637 return 0;
638
639 /* in the MAX_SIZE_HALF case modify the pointer */
640 if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF)
641 /* move the pointer to the correct range */
642 *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) -
643 SPI_TEST_MAX_SIZE_HALF;
644
645 /* RX range
646 * - we check against MAX_SIZE_PLUS to allow for automated alignment
647 */
648 if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
649 off = *ptr - RX(0);
650 *ptr = rx + off;
651
652 return 0;
653 }
654
655 /* TX range */
656 if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
657 off = *ptr - TX(0);
658 *ptr = tx + off;
659
660 return 0;
661 }
662
663 dev_err(&spi->dev,
664 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
665 *ptr, *ptr + len,
666 RX(0), RX(SPI_TEST_MAX_SIZE),
667 TX(0), TX(SPI_TEST_MAX_SIZE));
668
669 return -EINVAL;
670}
671
672static int spi_test_fill_pattern(struct spi_device *spi,
673 struct spi_test *test)
674{
675 struct spi_transfer *xfers = test->transfers;
676 u8 *tx_buf;
677 size_t count = 0;
678 int i, j;
679
680#ifdef __BIG_ENDIAN
681#define GET_VALUE_BYTE(value, index, bytes) \
682 (value >> (8 * (bytes - 1 - count % bytes)))
683#else
684#define GET_VALUE_BYTE(value, index, bytes) \
685 (value >> (8 * (count % bytes)))
686#endif
687
688 /* fill all transfers with the pattern requested */
689 for (i = 0; i < test->transfer_count; i++) {
690 /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */
691 if (xfers[i].rx_buf)
692 memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
693 xfers[i].len);
694 /* if tx_buf is NULL then skip */
695 tx_buf = (u8 *)xfers[i].tx_buf;
696 if (!tx_buf)
697 continue;
698 /* modify all the transfers */
699 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
700 /* fill tx */
701 switch (test->fill_option) {
702 case FILL_MEMSET_8:
703 *tx_buf = test->fill_pattern;
704 break;
705 case FILL_MEMSET_16:
706 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
707 count, 2);
708 break;
709 case FILL_MEMSET_24:
710 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
711 count, 3);
712 break;
713 case FILL_MEMSET_32:
714 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
715 count, 4);
716 break;
717 case FILL_COUNT_8:
718 *tx_buf = count;
719 break;
720 case FILL_COUNT_16:
721 *tx_buf = GET_VALUE_BYTE(count, count, 2);
722 break;
723 case FILL_COUNT_24:
724 *tx_buf = GET_VALUE_BYTE(count, count, 3);
725 break;
726 case FILL_COUNT_32:
727 *tx_buf = GET_VALUE_BYTE(count, count, 4);
728 break;
729 case FILL_TRANSFER_BYTE_8:
730 *tx_buf = j;
731 break;
732 case FILL_TRANSFER_BYTE_16:
733 *tx_buf = GET_VALUE_BYTE(j, j, 2);
734 break;
735 case FILL_TRANSFER_BYTE_24:
736 *tx_buf = GET_VALUE_BYTE(j, j, 3);
737 break;
738 case FILL_TRANSFER_BYTE_32:
739 *tx_buf = GET_VALUE_BYTE(j, j, 4);
740 break;
741 case FILL_TRANSFER_NUM:
742 *tx_buf = i;
743 break;
744 default:
745 dev_err(&spi->dev,
746 "unsupported fill_option: %i\n",
747 test->fill_option);
748 return -EINVAL;
749 }
750 }
751 }
752
753 return 0;
754}
755
756static int _spi_test_run_iter(struct spi_device *spi,
757 struct spi_test *test,
758 void *tx, void *rx)
759{
760 struct spi_message *msg = &test->msg;
761 struct spi_transfer *x;
762 int i, ret;
763
764 /* initialize message - zero-filled via static initialization */
765 spi_message_init_no_memset(msg);
766
767 /* fill rx with the DO_NOT_WRITE pattern */
768 memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
769
770 /* add the individual transfers */
771 for (i = 0; i < test->transfer_count; i++) {
772 x = &test->transfers[i];
773
774 /* patch the values of tx_buf */
775 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
776 (void *)tx, rx);
777 if (ret)
778 return ret;
779
780 /* patch the values of rx_buf */
781 ret = spi_test_translate(spi, &x->rx_buf, x->len,
782 (void *)tx, rx);
783 if (ret)
784 return ret;
785
786 /* and add it to the list */
787 spi_message_add_tail(x, msg);
788 }
789
790 /* fill in the transfer buffers with pattern */
791 ret = spi_test_fill_pattern(spi, test);
792 if (ret)
793 return ret;
794
795 /* and execute */
796 if (test->execute_msg)
797 ret = test->execute_msg(spi, test, tx, rx);
798 else
799 ret = spi_test_execute_msg(spi, test, tx, rx);
800
801 /* handle result */
802 if (ret == test->expected_return)
803 return 0;
804
805 dev_err(&spi->dev,
806 "test failed - test returned %i, but we expect %i\n",
807 ret, test->expected_return);
808
809 if (ret)
810 return ret;
811
812 /* if it is 0, as we expected something else,
813 * then return something special
814 */
815 return -EFAULT;
816}
817
818static int spi_test_run_iter(struct spi_device *spi,
819 const struct spi_test *testtemplate,
820 void *tx, void *rx,
821 size_t len,
822 size_t tx_off,
823 size_t rx_off
824 )
825{
826 struct spi_test test;
827 int i, tx_count, rx_count;
828
829 /* copy the test template to test */
830 memcpy(&test, testtemplate, sizeof(test));
831
832 /* if iterate_transfer_mask is not set,
833 * then set it to first transfer only
834 */
835 if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
836 test.iterate_transfer_mask = 1;
837
838 /* count number of transfers with tx/rx_buf != NULL */
839 rx_count = tx_count = 0;
840 for (i = 0; i < test.transfer_count; i++) {
841 if (test.transfers[i].tx_buf)
842 tx_count++;
843 if (test.transfers[i].rx_buf)
844 rx_count++;
845 }
846
847 /* in some iteration cases warn and exit early,
848 * as there is nothing to do, that has not been tested already...
849 */
850 if (tx_off && (!tx_count)) {
851 dev_warn_once(&spi->dev,
852 "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
853 test.description);
854 return 0;
855 }
856 if (rx_off && (!rx_count)) {
857 dev_warn_once(&spi->dev,
858 "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
859 test.description);
860 return 0;
861 }
862
863 /* write out info */
864 if (!(len || tx_off || rx_off)) {
865 dev_info(&spi->dev, "Running test %s\n", test.description);
866 } else {
867 dev_info(&spi->dev,
868 " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
869 len, tx_off, rx_off);
870 }
871
872 /* update in the values from iteration values */
873 for (i = 0; i < test.transfer_count; i++) {
874 /* only when bit in transfer mask is set */
875 if (!(test.iterate_transfer_mask & BIT(i)))
876 continue;
877 test.transfers[i].len = len;
878 if (test.transfers[i].tx_buf)
879 test.transfers[i].tx_buf += tx_off;
880 if (test.transfers[i].tx_buf)
881 test.transfers[i].rx_buf += rx_off;
882 }
883
884 /* and execute */
885 return _spi_test_run_iter(spi, &test, tx, rx);
886}
887
888/**
889 * spi_test_execute_msg - default implementation to run a test
890 *
891 * spi: @spi_device on which to run the @spi_message
892 * test: the test to execute, which already contains @msg
893 * tx: the tx buffer allocated for the test sequence
894 * rx: the rx buffer allocated for the test sequence
895 *
896 * Returns: error code of spi_sync as well as basic error checking
897 */
898int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
899 void *tx, void *rx)
900{
901 struct spi_message *msg = &test->msg;
902 int ret = 0;
903 int i;
904
905 /* only if we do not simulate */
906 if (!simulate_only) {
907 ktime_t start;
908
909 /* dump the complete message before and after the transfer */
910 if (dump_messages == 3)
911 spi_test_dump_message(spi, msg, true);
912
913 start = ktime_get();
914 /* run spi message */
915 ret = spi_sync(spi, msg);
916 test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start));
917 if (ret == -ETIMEDOUT) {
918 dev_info(&spi->dev,
919 "spi-message timed out - rerunning...\n");
920 /* rerun after a few explicit schedules */
921 for (i = 0; i < 16; i++)
922 schedule();
923 ret = spi_sync(spi, msg);
924 }
925 if (ret) {
926 dev_err(&spi->dev,
927 "Failed to execute spi_message: %i\n",
928 ret);
929 goto exit;
930 }
931
932 /* do some extra error checks */
933 if (msg->frame_length != msg->actual_length) {
934 dev_err(&spi->dev,
935 "actual length differs from expected\n");
936 ret = -EIO;
937 goto exit;
938 }
939
940 /* run rx-buffer tests */
941 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
942 if (ret)
943 goto exit;
944
945 ret = spi_test_check_elapsed_time(spi, test);
946 }
947
948 /* if requested or on error dump message (including data) */
949exit:
950 if (dump_messages || ret)
951 spi_test_dump_message(spi, msg,
952 (dump_messages >= 2) || (ret));
953
954 return ret;
955}
956EXPORT_SYMBOL_GPL(spi_test_execute_msg);
957
958/**
959 * spi_test_run_test - run an individual spi_test
960 * including all the relevant iterations on:
961 * length and buffer alignment
962 *
963 * spi: the spi_device to send the messages to
964 * test: the test which we need to execute
965 * tx: the tx buffer allocated for the test sequence
966 * rx: the rx buffer allocated for the test sequence
967 *
968 * Returns: status code of spi_sync or other failures
969 */
970
971int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
972 void *tx, void *rx)
973{
974 int idx_len;
975 size_t len;
976 size_t tx_align, rx_align;
977 int ret;
978
979 /* test for transfer limits */
980 if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
981 dev_err(&spi->dev,
982 "%s: Exceeded max number of transfers with %i\n",
983 test->description, test->transfer_count);
984 return -E2BIG;
985 }
986
987 /* setting up some values in spi_message
988 * based on some settings in spi_master
989 * some of this can also get done in the run() method
990 */
991
992 /* iterate over all the iterable values using macros
993 * (to make it a bit more readable...
994 */
995#define FOR_EACH_ALIGNMENT(var) \
996 for (var = 0; \
997 var < (test->iterate_##var ? \
998 (spi->master->dma_alignment ? \
999 spi->master->dma_alignment : \
1000 test->iterate_##var) : \
1001 1); \
1002 var++)
1003
1004 for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE &&
1005 (len = test->iterate_len[idx_len]) != -1; idx_len++) {
1006 FOR_EACH_ALIGNMENT(tx_align) {
1007 FOR_EACH_ALIGNMENT(rx_align) {
1008 /* and run the iteration */
1009 ret = spi_test_run_iter(spi, test,
1010 tx, rx,
1011 len,
1012 tx_align,
1013 rx_align);
1014 if (ret)
1015 return ret;
1016 }
1017 }
1018 }
1019
1020 return 0;
1021}
1022EXPORT_SYMBOL_GPL(spi_test_run_test);
1023
1024/**
1025 * spi_test_run_tests - run an array of spi_messages tests
1026 * @spi: the spi device on which to run the tests
1027 * @tests: NULL-terminated array of @spi_test
1028 *
1029 * Returns: status errors as per @spi_test_run_test()
1030 */
1031
1032int spi_test_run_tests(struct spi_device *spi,
1033 struct spi_test *tests)
1034{
1035 char *rx = NULL, *tx = NULL;
1036 int ret = 0, count = 0;
1037 struct spi_test *test;
1038
1039 /* allocate rx/tx buffers of 128kB size without devm
1040 * in the hope that is on a page boundary
1041 */
1042 if (use_vmalloc)
1043 rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1044 else
1045 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1046 if (!rx)
1047 return -ENOMEM;
1048
1049
1050 if (use_vmalloc)
1051 tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1052 else
1053 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1054 if (!tx) {
1055 ret = -ENOMEM;
1056 goto err_tx;
1057 }
1058
1059 /* now run the individual tests in the table */
1060 for (test = tests, count = 0; test->description[0];
1061 test++, count++) {
1062 /* only run test if requested */
1063 if ((run_only_test > -1) && (count != run_only_test))
1064 continue;
1065 /* run custom implementation */
1066 if (test->run_test)
1067 ret = test->run_test(spi, test, tx, rx);
1068 else
1069 ret = spi_test_run_test(spi, test, tx, rx);
1070 if (ret)
1071 goto out;
1072 /* add some delays so that we can easily
1073 * detect the individual tests when using a logic analyzer
1074 * we also add scheduling to avoid potential spi_timeouts...
1075 */
1076 mdelay(100);
1077 schedule();
1078 }
1079
1080out:
1081 kvfree(tx);
1082err_tx:
1083 kvfree(rx);
1084 return ret;
1085}
1086EXPORT_SYMBOL_GPL(spi_test_run_tests);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/spi/spi-loopback-test.c
4 *
5 * (c) Martin Sperl <kernel@martin.sperl.org>
6 *
7 * Loopback test driver to test several typical spi_message conditions
8 * that a spi_master driver may encounter
9 * this can also get used for regression testing
10 */
11
12#include <linux/delay.h>
13#include <linux/kernel.h>
14#include <linux/ktime.h>
15#include <linux/list.h>
16#include <linux/list_sort.h>
17#include <linux/module.h>
18#include <linux/of_device.h>
19#include <linux/printk.h>
20#include <linux/vmalloc.h>
21#include <linux/spi/spi.h>
22
23#include "spi-test.h"
24
25/* flag to only simulate transfers */
26static int simulate_only;
27module_param(simulate_only, int, 0);
28MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message");
29
30/* dump spi messages */
31static int dump_messages;
32module_param(dump_messages, int, 0);
33MODULE_PARM_DESC(dump_messages,
34 "=1 dump the basic spi_message_structure, " \
35 "=2 dump the spi_message_structure including data, " \
36 "=3 dump the spi_message structure before and after execution");
37/* the device is jumpered for loopback - enabling some rx_buf tests */
38static int loopback;
39module_param(loopback, int, 0);
40MODULE_PARM_DESC(loopback,
41 "if set enable loopback mode, where the rx_buf " \
42 "is checked to match tx_buf after the spi_message " \
43 "is executed");
44
45static int loop_req;
46module_param(loop_req, int, 0);
47MODULE_PARM_DESC(loop_req,
48 "if set controller will be asked to enable test loop mode. " \
49 "If controller supported it, MISO and MOSI will be connected");
50
51static int no_cs;
52module_param(no_cs, int, 0);
53MODULE_PARM_DESC(no_cs,
54 "if set Chip Select (CS) will not be used");
55
56/* run only a specific test */
57static int run_only_test = -1;
58module_param(run_only_test, int, 0);
59MODULE_PARM_DESC(run_only_test,
60 "only run the test with this number (0-based !)");
61
62/* use vmalloc'ed buffers */
63static int use_vmalloc;
64module_param(use_vmalloc, int, 0644);
65MODULE_PARM_DESC(use_vmalloc,
66 "use vmalloc'ed buffers instead of kmalloc'ed");
67
68/* check rx ranges */
69static int check_ranges = 1;
70module_param(check_ranges, int, 0644);
71MODULE_PARM_DESC(check_ranges,
72 "checks rx_buffer pattern are valid");
73
74/* the actual tests to execute */
75static struct spi_test spi_tests[] = {
76 {
77 .description = "tx/rx-transfer - start of page",
78 .fill_option = FILL_COUNT_8,
79 .iterate_len = { ITERATE_MAX_LEN },
80 .iterate_tx_align = ITERATE_ALIGN,
81 .iterate_rx_align = ITERATE_ALIGN,
82 .transfer_count = 1,
83 .transfers = {
84 {
85 .tx_buf = TX(0),
86 .rx_buf = RX(0),
87 },
88 },
89 },
90 {
91 .description = "tx/rx-transfer - crossing PAGE_SIZE",
92 .fill_option = FILL_COUNT_8,
93 .iterate_len = { ITERATE_LEN },
94 .iterate_tx_align = ITERATE_ALIGN,
95 .iterate_rx_align = ITERATE_ALIGN,
96 .transfer_count = 1,
97 .transfers = {
98 {
99 .tx_buf = TX(PAGE_SIZE - 4),
100 .rx_buf = RX(PAGE_SIZE - 4),
101 },
102 },
103 },
104 {
105 .description = "tx-transfer - only",
106 .fill_option = FILL_COUNT_8,
107 .iterate_len = { ITERATE_MAX_LEN },
108 .iterate_tx_align = ITERATE_ALIGN,
109 .transfer_count = 1,
110 .transfers = {
111 {
112 .tx_buf = TX(0),
113 },
114 },
115 },
116 {
117 .description = "rx-transfer - only",
118 .fill_option = FILL_COUNT_8,
119 .iterate_len = { ITERATE_MAX_LEN },
120 .iterate_rx_align = ITERATE_ALIGN,
121 .transfer_count = 1,
122 .transfers = {
123 {
124 .rx_buf = RX(0),
125 },
126 },
127 },
128 {
129 .description = "two tx-transfers - alter both",
130 .fill_option = FILL_COUNT_8,
131 .iterate_len = { ITERATE_LEN },
132 .iterate_tx_align = ITERATE_ALIGN,
133 .iterate_transfer_mask = BIT(0) | BIT(1),
134 .transfer_count = 2,
135 .transfers = {
136 {
137 .tx_buf = TX(0),
138 },
139 {
140 /* this is why we cant use ITERATE_MAX_LEN */
141 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
142 },
143 },
144 },
145 {
146 .description = "two tx-transfers - alter first",
147 .fill_option = FILL_COUNT_8,
148 .iterate_len = { ITERATE_MAX_LEN },
149 .iterate_tx_align = ITERATE_ALIGN,
150 .iterate_transfer_mask = BIT(0),
151 .transfer_count = 2,
152 .transfers = {
153 {
154 .tx_buf = TX(64),
155 },
156 {
157 .len = 1,
158 .tx_buf = TX(0),
159 },
160 },
161 },
162 {
163 .description = "two tx-transfers - alter second",
164 .fill_option = FILL_COUNT_8,
165 .iterate_len = { ITERATE_MAX_LEN },
166 .iterate_tx_align = ITERATE_ALIGN,
167 .iterate_transfer_mask = BIT(1),
168 .transfer_count = 2,
169 .transfers = {
170 {
171 .len = 16,
172 .tx_buf = TX(0),
173 },
174 {
175 .tx_buf = TX(64),
176 },
177 },
178 },
179 {
180 .description = "two transfers tx then rx - alter both",
181 .fill_option = FILL_COUNT_8,
182 .iterate_len = { ITERATE_MAX_LEN },
183 .iterate_tx_align = ITERATE_ALIGN,
184 .iterate_transfer_mask = BIT(0) | BIT(1),
185 .transfer_count = 2,
186 .transfers = {
187 {
188 .tx_buf = TX(0),
189 },
190 {
191 .rx_buf = RX(0),
192 },
193 },
194 },
195 {
196 .description = "two transfers tx then rx - alter tx",
197 .fill_option = FILL_COUNT_8,
198 .iterate_len = { ITERATE_MAX_LEN },
199 .iterate_tx_align = ITERATE_ALIGN,
200 .iterate_transfer_mask = BIT(0),
201 .transfer_count = 2,
202 .transfers = {
203 {
204 .tx_buf = TX(0),
205 },
206 {
207 .len = 1,
208 .rx_buf = RX(0),
209 },
210 },
211 },
212 {
213 .description = "two transfers tx then rx - alter rx",
214 .fill_option = FILL_COUNT_8,
215 .iterate_len = { ITERATE_MAX_LEN },
216 .iterate_tx_align = ITERATE_ALIGN,
217 .iterate_transfer_mask = BIT(1),
218 .transfer_count = 2,
219 .transfers = {
220 {
221 .len = 1,
222 .tx_buf = TX(0),
223 },
224 {
225 .rx_buf = RX(0),
226 },
227 },
228 },
229 {
230 .description = "two tx+rx transfers - alter both",
231 .fill_option = FILL_COUNT_8,
232 .iterate_len = { ITERATE_LEN },
233 .iterate_tx_align = ITERATE_ALIGN,
234 .iterate_transfer_mask = BIT(0) | BIT(1),
235 .transfer_count = 2,
236 .transfers = {
237 {
238 .tx_buf = TX(0),
239 .rx_buf = RX(0),
240 },
241 {
242 /* making sure we align without overwrite
243 * the reason we can not use ITERATE_MAX_LEN
244 */
245 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
246 .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF),
247 },
248 },
249 },
250 {
251 .description = "two tx+rx transfers - alter first",
252 .fill_option = FILL_COUNT_8,
253 .iterate_len = { ITERATE_MAX_LEN },
254 .iterate_tx_align = ITERATE_ALIGN,
255 .iterate_transfer_mask = BIT(0),
256 .transfer_count = 2,
257 .transfers = {
258 {
259 /* making sure we align without overwrite */
260 .tx_buf = TX(1024),
261 .rx_buf = RX(1024),
262 },
263 {
264 .len = 1,
265 /* making sure we align without overwrite */
266 .tx_buf = TX(0),
267 .rx_buf = RX(0),
268 },
269 },
270 },
271 {
272 .description = "two tx+rx transfers - alter second",
273 .fill_option = FILL_COUNT_8,
274 .iterate_len = { ITERATE_MAX_LEN },
275 .iterate_tx_align = ITERATE_ALIGN,
276 .iterate_transfer_mask = BIT(1),
277 .transfer_count = 2,
278 .transfers = {
279 {
280 .len = 1,
281 .tx_buf = TX(0),
282 .rx_buf = RX(0),
283 },
284 {
285 /* making sure we align without overwrite */
286 .tx_buf = TX(1024),
287 .rx_buf = RX(1024),
288 },
289 },
290 },
291 {
292 .description = "two tx+rx transfers - delay after transfer",
293 .fill_option = FILL_COUNT_8,
294 .iterate_len = { ITERATE_MAX_LEN },
295 .iterate_transfer_mask = BIT(0) | BIT(1),
296 .transfer_count = 2,
297 .transfers = {
298 {
299 .tx_buf = TX(0),
300 .rx_buf = RX(0),
301 .delay = {
302 .value = 1000,
303 .unit = SPI_DELAY_UNIT_USECS,
304 },
305 },
306 {
307 .tx_buf = TX(0),
308 .rx_buf = RX(0),
309 .delay = {
310 .value = 1000,
311 .unit = SPI_DELAY_UNIT_USECS,
312 },
313 },
314 },
315 },
316
317 { /* end of tests sequence */ }
318};
319
320static int spi_loopback_test_probe(struct spi_device *spi)
321{
322 int ret;
323
324 if (loop_req || no_cs) {
325 spi->mode |= loop_req ? SPI_LOOP : 0;
326 spi->mode |= no_cs ? SPI_NO_CS : 0;
327 ret = spi_setup(spi);
328 if (ret) {
329 dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",
330 ret);
331 return ret;
332 }
333 }
334
335 dev_info(&spi->dev, "Executing spi-loopback-tests\n");
336
337 ret = spi_test_run_tests(spi, spi_tests);
338
339 dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
340 ret);
341
342 return ret;
343}
344
345/* non const match table to permit to change via a module parameter */
346static struct of_device_id spi_loopback_test_of_match[] = {
347 { .compatible = "linux,spi-loopback-test", },
348 { }
349};
350
351/* allow to override the compatible string via a module_parameter */
352module_param_string(compatible, spi_loopback_test_of_match[0].compatible,
353 sizeof(spi_loopback_test_of_match[0].compatible),
354 0000);
355
356MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
357
358static struct spi_driver spi_loopback_test_driver = {
359 .driver = {
360 .name = "spi-loopback-test",
361 .owner = THIS_MODULE,
362 .of_match_table = spi_loopback_test_of_match,
363 },
364 .probe = spi_loopback_test_probe,
365};
366
367module_spi_driver(spi_loopback_test_driver);
368
369MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
370MODULE_DESCRIPTION("test spi_driver to check core functionality");
371MODULE_LICENSE("GPL");
372
373/*-------------------------------------------------------------------------*/
374
375/* spi_test implementation */
376
377#define RANGE_CHECK(ptr, plen, start, slen) \
378 ((ptr >= start) && (ptr + plen <= start + slen))
379
380/* we allocate one page more, to allow for offsets */
381#define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
382
383static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
384{
385 /* limit the hex_dump */
386 if (len < 1024) {
387 print_hex_dump(KERN_INFO, pre,
388 DUMP_PREFIX_OFFSET, 16, 1,
389 ptr, len, 0);
390 return;
391 }
392 /* print head */
393 print_hex_dump(KERN_INFO, pre,
394 DUMP_PREFIX_OFFSET, 16, 1,
395 ptr, 512, 0);
396 /* print tail */
397 pr_info("%s truncated - continuing at offset %04zx\n",
398 pre, len - 512);
399 print_hex_dump(KERN_INFO, pre,
400 DUMP_PREFIX_OFFSET, 16, 1,
401 ptr + (len - 512), 512, 0);
402}
403
404static void spi_test_dump_message(struct spi_device *spi,
405 struct spi_message *msg,
406 bool dump_data)
407{
408 struct spi_transfer *xfer;
409 int i;
410 u8 b;
411
412 dev_info(&spi->dev, " spi_msg@%pK\n", msg);
413 if (msg->status)
414 dev_info(&spi->dev, " status: %i\n",
415 msg->status);
416 dev_info(&spi->dev, " frame_length: %i\n",
417 msg->frame_length);
418 dev_info(&spi->dev, " actual_length: %i\n",
419 msg->actual_length);
420
421 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
422 dev_info(&spi->dev, " spi_transfer@%pK\n", xfer);
423 dev_info(&spi->dev, " len: %i\n", xfer->len);
424 dev_info(&spi->dev, " tx_buf: %pK\n", xfer->tx_buf);
425 if (dump_data && xfer->tx_buf)
426 spi_test_print_hex_dump(" TX: ",
427 xfer->tx_buf,
428 xfer->len);
429
430 dev_info(&spi->dev, " rx_buf: %pK\n", xfer->rx_buf);
431 if (dump_data && xfer->rx_buf)
432 spi_test_print_hex_dump(" RX: ",
433 xfer->rx_buf,
434 xfer->len);
435 /* check for unwritten test pattern on rx_buf */
436 if (xfer->rx_buf) {
437 for (i = 0 ; i < xfer->len ; i++) {
438 b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i];
439 if (b != SPI_TEST_PATTERN_UNWRITTEN)
440 break;
441 }
442 if (i)
443 dev_info(&spi->dev,
444 " rx_buf filled with %02x starts at offset: %i\n",
445 SPI_TEST_PATTERN_UNWRITTEN,
446 xfer->len - i);
447 }
448 }
449}
450
451struct rx_ranges {
452 struct list_head list;
453 u8 *start;
454 u8 *end;
455};
456
457static int rx_ranges_cmp(void *priv, struct list_head *a, struct list_head *b)
458{
459 struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list);
460 struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list);
461
462 if (rx_a->start > rx_b->start)
463 return 1;
464 if (rx_a->start < rx_b->start)
465 return -1;
466 return 0;
467}
468
469static int spi_check_rx_ranges(struct spi_device *spi,
470 struct spi_message *msg,
471 void *rx)
472{
473 struct spi_transfer *xfer;
474 struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
475 int i = 0;
476 LIST_HEAD(ranges_list);
477 u8 *addr;
478 int ret = 0;
479
480 /* loop over all transfers to fill in the rx_ranges */
481 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
482 /* if there is no rx, then no check is needed */
483 if (!xfer->rx_buf)
484 continue;
485 /* fill in the rx_range */
486 if (RANGE_CHECK(xfer->rx_buf, xfer->len,
487 rx, SPI_TEST_MAX_SIZE_PLUS)) {
488 ranges[i].start = xfer->rx_buf;
489 ranges[i].end = xfer->rx_buf + xfer->len;
490 list_add(&ranges[i].list, &ranges_list);
491 i++;
492 }
493 }
494
495 /* if no ranges, then we can return and avoid the checks...*/
496 if (!i)
497 return 0;
498
499 /* sort the list */
500 list_sort(NULL, &ranges_list, rx_ranges_cmp);
501
502 /* and iterate over all the rx addresses */
503 for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) {
504 /* if we are the DO not write pattern,
505 * then continue with the loop...
506 */
507 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
508 continue;
509
510 /* check if we are inside a range */
511 list_for_each_entry(r, &ranges_list, list) {
512 /* if so then set to end... */
513 if ((addr >= r->start) && (addr < r->end))
514 addr = r->end;
515 }
516 /* second test after a (hopefull) translation */
517 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
518 continue;
519
520 /* if still not found then something has modified too much */
521 /* we could list the "closest" transfer here... */
522 dev_err(&spi->dev,
523 "loopback strangeness - rx changed outside of allowed range at: %pK\n",
524 addr);
525 /* do not return, only set ret,
526 * so that we list all addresses
527 */
528 ret = -ERANGE;
529 }
530
531 return ret;
532}
533
534static int spi_test_check_elapsed_time(struct spi_device *spi,
535 struct spi_test *test)
536{
537 int i;
538 unsigned long long estimated_time = 0;
539 unsigned long long delay_usecs = 0;
540
541 for (i = 0; i < test->transfer_count; i++) {
542 struct spi_transfer *xfer = test->transfers + i;
543 unsigned long long nbits = (unsigned long long)BITS_PER_BYTE *
544 xfer->len;
545
546 delay_usecs += xfer->delay.value;
547 if (!xfer->speed_hz)
548 continue;
549 estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz);
550 }
551
552 estimated_time += delay_usecs * NSEC_PER_USEC;
553 if (test->elapsed_time < estimated_time) {
554 dev_err(&spi->dev,
555 "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n",
556 test->elapsed_time, estimated_time);
557
558 return -EINVAL;
559 }
560
561 return 0;
562}
563
564static int spi_test_check_loopback_result(struct spi_device *spi,
565 struct spi_message *msg,
566 void *tx, void *rx)
567{
568 struct spi_transfer *xfer;
569 u8 rxb, txb;
570 size_t i;
571 int ret;
572
573 /* checks rx_buffer pattern are valid with loopback or without */
574 if (check_ranges) {
575 ret = spi_check_rx_ranges(spi, msg, rx);
576 if (ret)
577 return ret;
578 }
579
580 /* if we run without loopback, then return now */
581 if (!loopback)
582 return 0;
583
584 /* if applicable to transfer check that rx_buf is equal to tx_buf */
585 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
586 /* if there is no rx, then no check is needed */
587 if (!xfer->len || !xfer->rx_buf)
588 continue;
589 /* so depending on tx_buf we need to handle things */
590 if (xfer->tx_buf) {
591 for (i = 0; i < xfer->len; i++) {
592 txb = ((u8 *)xfer->tx_buf)[i];
593 rxb = ((u8 *)xfer->rx_buf)[i];
594 if (txb != rxb)
595 goto mismatch_error;
596 }
597 } else {
598 /* first byte received */
599 txb = ((u8 *)xfer->rx_buf)[0];
600 /* first byte may be 0 or xff */
601 if (!((txb == 0) || (txb == 0xff))) {
602 dev_err(&spi->dev,
603 "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
604 txb);
605 return -EINVAL;
606 }
607 /* check that all bytes are identical */
608 for (i = 1; i < xfer->len; i++) {
609 rxb = ((u8 *)xfer->rx_buf)[i];
610 if (rxb != txb)
611 goto mismatch_error;
612 }
613 }
614 }
615
616 return 0;
617
618mismatch_error:
619 dev_err(&spi->dev,
620 "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
621 i, txb, rxb);
622
623 return -EINVAL;
624}
625
626static int spi_test_translate(struct spi_device *spi,
627 void **ptr, size_t len,
628 void *tx, void *rx)
629{
630 size_t off;
631
632 /* return on null */
633 if (!*ptr)
634 return 0;
635
636 /* in the MAX_SIZE_HALF case modify the pointer */
637 if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF)
638 /* move the pointer to the correct range */
639 *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) -
640 SPI_TEST_MAX_SIZE_HALF;
641
642 /* RX range
643 * - we check against MAX_SIZE_PLUS to allow for automated alignment
644 */
645 if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
646 off = *ptr - RX(0);
647 *ptr = rx + off;
648
649 return 0;
650 }
651
652 /* TX range */
653 if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
654 off = *ptr - TX(0);
655 *ptr = tx + off;
656
657 return 0;
658 }
659
660 dev_err(&spi->dev,
661 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
662 *ptr, *ptr + len,
663 RX(0), RX(SPI_TEST_MAX_SIZE),
664 TX(0), TX(SPI_TEST_MAX_SIZE));
665
666 return -EINVAL;
667}
668
669static int spi_test_fill_pattern(struct spi_device *spi,
670 struct spi_test *test)
671{
672 struct spi_transfer *xfers = test->transfers;
673 u8 *tx_buf;
674 size_t count = 0;
675 int i, j;
676
677#ifdef __BIG_ENDIAN
678#define GET_VALUE_BYTE(value, index, bytes) \
679 (value >> (8 * (bytes - 1 - count % bytes)))
680#else
681#define GET_VALUE_BYTE(value, index, bytes) \
682 (value >> (8 * (count % bytes)))
683#endif
684
685 /* fill all transfers with the pattern requested */
686 for (i = 0; i < test->transfer_count; i++) {
687 /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */
688 if (xfers[i].rx_buf)
689 memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
690 xfers[i].len);
691 /* if tx_buf is NULL then skip */
692 tx_buf = (u8 *)xfers[i].tx_buf;
693 if (!tx_buf)
694 continue;
695 /* modify all the transfers */
696 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
697 /* fill tx */
698 switch (test->fill_option) {
699 case FILL_MEMSET_8:
700 *tx_buf = test->fill_pattern;
701 break;
702 case FILL_MEMSET_16:
703 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
704 count, 2);
705 break;
706 case FILL_MEMSET_24:
707 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
708 count, 3);
709 break;
710 case FILL_MEMSET_32:
711 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
712 count, 4);
713 break;
714 case FILL_COUNT_8:
715 *tx_buf = count;
716 break;
717 case FILL_COUNT_16:
718 *tx_buf = GET_VALUE_BYTE(count, count, 2);
719 break;
720 case FILL_COUNT_24:
721 *tx_buf = GET_VALUE_BYTE(count, count, 3);
722 break;
723 case FILL_COUNT_32:
724 *tx_buf = GET_VALUE_BYTE(count, count, 4);
725 break;
726 case FILL_TRANSFER_BYTE_8:
727 *tx_buf = j;
728 break;
729 case FILL_TRANSFER_BYTE_16:
730 *tx_buf = GET_VALUE_BYTE(j, j, 2);
731 break;
732 case FILL_TRANSFER_BYTE_24:
733 *tx_buf = GET_VALUE_BYTE(j, j, 3);
734 break;
735 case FILL_TRANSFER_BYTE_32:
736 *tx_buf = GET_VALUE_BYTE(j, j, 4);
737 break;
738 case FILL_TRANSFER_NUM:
739 *tx_buf = i;
740 break;
741 default:
742 dev_err(&spi->dev,
743 "unsupported fill_option: %i\n",
744 test->fill_option);
745 return -EINVAL;
746 }
747 }
748 }
749
750 return 0;
751}
752
753static int _spi_test_run_iter(struct spi_device *spi,
754 struct spi_test *test,
755 void *tx, void *rx)
756{
757 struct spi_message *msg = &test->msg;
758 struct spi_transfer *x;
759 int i, ret;
760
761 /* initialize message - zero-filled via static initialization */
762 spi_message_init_no_memset(msg);
763
764 /* fill rx with the DO_NOT_WRITE pattern */
765 memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
766
767 /* add the individual transfers */
768 for (i = 0; i < test->transfer_count; i++) {
769 x = &test->transfers[i];
770
771 /* patch the values of tx_buf */
772 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
773 (void *)tx, rx);
774 if (ret)
775 return ret;
776
777 /* patch the values of rx_buf */
778 ret = spi_test_translate(spi, &x->rx_buf, x->len,
779 (void *)tx, rx);
780 if (ret)
781 return ret;
782
783 /* and add it to the list */
784 spi_message_add_tail(x, msg);
785 }
786
787 /* fill in the transfer buffers with pattern */
788 ret = spi_test_fill_pattern(spi, test);
789 if (ret)
790 return ret;
791
792 /* and execute */
793 if (test->execute_msg)
794 ret = test->execute_msg(spi, test, tx, rx);
795 else
796 ret = spi_test_execute_msg(spi, test, tx, rx);
797
798 /* handle result */
799 if (ret == test->expected_return)
800 return 0;
801
802 dev_err(&spi->dev,
803 "test failed - test returned %i, but we expect %i\n",
804 ret, test->expected_return);
805
806 if (ret)
807 return ret;
808
809 /* if it is 0, as we expected something else,
810 * then return something special
811 */
812 return -EFAULT;
813}
814
815static int spi_test_run_iter(struct spi_device *spi,
816 const struct spi_test *testtemplate,
817 void *tx, void *rx,
818 size_t len,
819 size_t tx_off,
820 size_t rx_off
821 )
822{
823 struct spi_test test;
824 int i, tx_count, rx_count;
825
826 /* copy the test template to test */
827 memcpy(&test, testtemplate, sizeof(test));
828
829 /* if iterate_transfer_mask is not set,
830 * then set it to first transfer only
831 */
832 if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
833 test.iterate_transfer_mask = 1;
834
835 /* count number of transfers with tx/rx_buf != NULL */
836 rx_count = tx_count = 0;
837 for (i = 0; i < test.transfer_count; i++) {
838 if (test.transfers[i].tx_buf)
839 tx_count++;
840 if (test.transfers[i].rx_buf)
841 rx_count++;
842 }
843
844 /* in some iteration cases warn and exit early,
845 * as there is nothing to do, that has not been tested already...
846 */
847 if (tx_off && (!tx_count)) {
848 dev_warn_once(&spi->dev,
849 "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
850 test.description);
851 return 0;
852 }
853 if (rx_off && (!rx_count)) {
854 dev_warn_once(&spi->dev,
855 "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
856 test.description);
857 return 0;
858 }
859
860 /* write out info */
861 if (!(len || tx_off || rx_off)) {
862 dev_info(&spi->dev, "Running test %s\n", test.description);
863 } else {
864 dev_info(&spi->dev,
865 " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
866 len, tx_off, rx_off);
867 }
868
869 /* update in the values from iteration values */
870 for (i = 0; i < test.transfer_count; i++) {
871 /* only when bit in transfer mask is set */
872 if (!(test.iterate_transfer_mask & BIT(i)))
873 continue;
874 test.transfers[i].len = len;
875 if (test.transfers[i].tx_buf)
876 test.transfers[i].tx_buf += tx_off;
877 if (test.transfers[i].tx_buf)
878 test.transfers[i].rx_buf += rx_off;
879 }
880
881 /* and execute */
882 return _spi_test_run_iter(spi, &test, tx, rx);
883}
884
885/**
886 * spi_test_execute_msg - default implementation to run a test
887 *
888 * @spi: @spi_device on which to run the @spi_message
889 * @test: the test to execute, which already contains @msg
890 * @tx: the tx buffer allocated for the test sequence
891 * @rx: the rx buffer allocated for the test sequence
892 *
893 * Returns: error code of spi_sync as well as basic error checking
894 */
895int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
896 void *tx, void *rx)
897{
898 struct spi_message *msg = &test->msg;
899 int ret = 0;
900 int i;
901
902 /* only if we do not simulate */
903 if (!simulate_only) {
904 ktime_t start;
905
906 /* dump the complete message before and after the transfer */
907 if (dump_messages == 3)
908 spi_test_dump_message(spi, msg, true);
909
910 start = ktime_get();
911 /* run spi message */
912 ret = spi_sync(spi, msg);
913 test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start));
914 if (ret == -ETIMEDOUT) {
915 dev_info(&spi->dev,
916 "spi-message timed out - rerunning...\n");
917 /* rerun after a few explicit schedules */
918 for (i = 0; i < 16; i++)
919 schedule();
920 ret = spi_sync(spi, msg);
921 }
922 if (ret) {
923 dev_err(&spi->dev,
924 "Failed to execute spi_message: %i\n",
925 ret);
926 goto exit;
927 }
928
929 /* do some extra error checks */
930 if (msg->frame_length != msg->actual_length) {
931 dev_err(&spi->dev,
932 "actual length differs from expected\n");
933 ret = -EIO;
934 goto exit;
935 }
936
937 /* run rx-buffer tests */
938 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
939 if (ret)
940 goto exit;
941
942 ret = spi_test_check_elapsed_time(spi, test);
943 }
944
945 /* if requested or on error dump message (including data) */
946exit:
947 if (dump_messages || ret)
948 spi_test_dump_message(spi, msg,
949 (dump_messages >= 2) || (ret));
950
951 return ret;
952}
953EXPORT_SYMBOL_GPL(spi_test_execute_msg);
954
955/**
956 * spi_test_run_test - run an individual spi_test
957 * including all the relevant iterations on:
958 * length and buffer alignment
959 *
960 * @spi: the spi_device to send the messages to
961 * @test: the test which we need to execute
962 * @tx: the tx buffer allocated for the test sequence
963 * @rx: the rx buffer allocated for the test sequence
964 *
965 * Returns: status code of spi_sync or other failures
966 */
967
968int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
969 void *tx, void *rx)
970{
971 int idx_len;
972 size_t len;
973 size_t tx_align, rx_align;
974 int ret;
975
976 /* test for transfer limits */
977 if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
978 dev_err(&spi->dev,
979 "%s: Exceeded max number of transfers with %i\n",
980 test->description, test->transfer_count);
981 return -E2BIG;
982 }
983
984 /* setting up some values in spi_message
985 * based on some settings in spi_master
986 * some of this can also get done in the run() method
987 */
988
989 /* iterate over all the iterable values using macros
990 * (to make it a bit more readable...
991 */
992#define FOR_EACH_ALIGNMENT(var) \
993 for (var = 0; \
994 var < (test->iterate_##var ? \
995 (spi->master->dma_alignment ? \
996 spi->master->dma_alignment : \
997 test->iterate_##var) : \
998 1); \
999 var++)
1000
1001 for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE &&
1002 (len = test->iterate_len[idx_len]) != -1; idx_len++) {
1003 FOR_EACH_ALIGNMENT(tx_align) {
1004 FOR_EACH_ALIGNMENT(rx_align) {
1005 /* and run the iteration */
1006 ret = spi_test_run_iter(spi, test,
1007 tx, rx,
1008 len,
1009 tx_align,
1010 rx_align);
1011 if (ret)
1012 return ret;
1013 }
1014 }
1015 }
1016
1017 return 0;
1018}
1019EXPORT_SYMBOL_GPL(spi_test_run_test);
1020
1021/**
1022 * spi_test_run_tests - run an array of spi_messages tests
1023 * @spi: the spi device on which to run the tests
1024 * @tests: NULL-terminated array of @spi_test
1025 *
1026 * Returns: status errors as per @spi_test_run_test()
1027 */
1028
1029int spi_test_run_tests(struct spi_device *spi,
1030 struct spi_test *tests)
1031{
1032 char *rx = NULL, *tx = NULL;
1033 int ret = 0, count = 0;
1034 struct spi_test *test;
1035
1036 /* allocate rx/tx buffers of 128kB size without devm
1037 * in the hope that is on a page boundary
1038 */
1039 if (use_vmalloc)
1040 rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1041 else
1042 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1043 if (!rx)
1044 return -ENOMEM;
1045
1046
1047 if (use_vmalloc)
1048 tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1049 else
1050 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1051 if (!tx) {
1052 ret = -ENOMEM;
1053 goto err_tx;
1054 }
1055
1056 /* now run the individual tests in the table */
1057 for (test = tests, count = 0; test->description[0];
1058 test++, count++) {
1059 /* only run test if requested */
1060 if ((run_only_test > -1) && (count != run_only_test))
1061 continue;
1062 /* run custom implementation */
1063 if (test->run_test)
1064 ret = test->run_test(spi, test, tx, rx);
1065 else
1066 ret = spi_test_run_test(spi, test, tx, rx);
1067 if (ret)
1068 goto out;
1069 /* add some delays so that we can easily
1070 * detect the individual tests when using a logic analyzer
1071 * we also add scheduling to avoid potential spi_timeouts...
1072 */
1073 mdelay(100);
1074 schedule();
1075 }
1076
1077out:
1078 kvfree(tx);
1079err_tx:
1080 kvfree(rx);
1081 return ret;
1082}
1083EXPORT_SYMBOL_GPL(spi_test_run_tests);