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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);