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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 .description = "three tx+rx transfers with overlapping cache lines",
318 .fill_option = FILL_COUNT_8,
319 /*
320 * This should be large enough for the controller driver to
321 * choose to transfer it with DMA.
322 */
323 .iterate_len = { 512, -1 },
324 .iterate_transfer_mask = BIT(1),
325 .transfer_count = 3,
326 .transfers = {
327 {
328 .len = 1,
329 .tx_buf = TX(0),
330 .rx_buf = RX(0),
331 },
332 {
333 .tx_buf = TX(1),
334 .rx_buf = RX(1),
335 },
336 {
337 .len = 1,
338 .tx_buf = TX(513),
339 .rx_buf = RX(513),
340 },
341 },
342 },
343
344 { /* end of tests sequence */ }
345};
346
347static int spi_loopback_test_probe(struct spi_device *spi)
348{
349 int ret;
350
351 if (loop_req || no_cs) {
352 spi->mode |= loop_req ? SPI_LOOP : 0;
353 spi->mode |= no_cs ? SPI_NO_CS : 0;
354 ret = spi_setup(spi);
355 if (ret) {
356 dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",
357 ret);
358 return ret;
359 }
360 }
361
362 dev_info(&spi->dev, "Executing spi-loopback-tests\n");
363
364 ret = spi_test_run_tests(spi, spi_tests);
365
366 dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
367 ret);
368
369 return ret;
370}
371
372/* non const match table to permit to change via a module parameter */
373static struct of_device_id spi_loopback_test_of_match[] = {
374 { .compatible = "linux,spi-loopback-test", },
375 { }
376};
377
378/* allow to override the compatible string via a module_parameter */
379module_param_string(compatible, spi_loopback_test_of_match[0].compatible,
380 sizeof(spi_loopback_test_of_match[0].compatible),
381 0000);
382
383MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
384
385static struct spi_driver spi_loopback_test_driver = {
386 .driver = {
387 .name = "spi-loopback-test",
388 .owner = THIS_MODULE,
389 .of_match_table = spi_loopback_test_of_match,
390 },
391 .probe = spi_loopback_test_probe,
392};
393
394module_spi_driver(spi_loopback_test_driver);
395
396MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
397MODULE_DESCRIPTION("test spi_driver to check core functionality");
398MODULE_LICENSE("GPL");
399
400/*-------------------------------------------------------------------------*/
401
402/* spi_test implementation */
403
404#define RANGE_CHECK(ptr, plen, start, slen) \
405 ((ptr >= start) && (ptr + plen <= start + slen))
406
407/* we allocate one page more, to allow for offsets */
408#define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
409
410static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
411{
412 /* limit the hex_dump */
413 if (len < 1024) {
414 print_hex_dump(KERN_INFO, pre,
415 DUMP_PREFIX_OFFSET, 16, 1,
416 ptr, len, 0);
417 return;
418 }
419 /* print head */
420 print_hex_dump(KERN_INFO, pre,
421 DUMP_PREFIX_OFFSET, 16, 1,
422 ptr, 512, 0);
423 /* print tail */
424 pr_info("%s truncated - continuing at offset %04zx\n",
425 pre, len - 512);
426 print_hex_dump(KERN_INFO, pre,
427 DUMP_PREFIX_OFFSET, 16, 1,
428 ptr + (len - 512), 512, 0);
429}
430
431static void spi_test_dump_message(struct spi_device *spi,
432 struct spi_message *msg,
433 bool dump_data)
434{
435 struct spi_transfer *xfer;
436 int i;
437 u8 b;
438
439 dev_info(&spi->dev, " spi_msg@%pK\n", msg);
440 if (msg->status)
441 dev_info(&spi->dev, " status: %i\n",
442 msg->status);
443 dev_info(&spi->dev, " frame_length: %i\n",
444 msg->frame_length);
445 dev_info(&spi->dev, " actual_length: %i\n",
446 msg->actual_length);
447
448 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
449 dev_info(&spi->dev, " spi_transfer@%pK\n", xfer);
450 dev_info(&spi->dev, " len: %i\n", xfer->len);
451 dev_info(&spi->dev, " tx_buf: %pK\n", xfer->tx_buf);
452 if (dump_data && xfer->tx_buf)
453 spi_test_print_hex_dump(" TX: ",
454 xfer->tx_buf,
455 xfer->len);
456
457 dev_info(&spi->dev, " rx_buf: %pK\n", xfer->rx_buf);
458 if (dump_data && xfer->rx_buf)
459 spi_test_print_hex_dump(" RX: ",
460 xfer->rx_buf,
461 xfer->len);
462 /* check for unwritten test pattern on rx_buf */
463 if (xfer->rx_buf) {
464 for (i = 0 ; i < xfer->len ; i++) {
465 b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i];
466 if (b != SPI_TEST_PATTERN_UNWRITTEN)
467 break;
468 }
469 if (i)
470 dev_info(&spi->dev,
471 " rx_buf filled with %02x starts at offset: %i\n",
472 SPI_TEST_PATTERN_UNWRITTEN,
473 xfer->len - i);
474 }
475 }
476}
477
478struct rx_ranges {
479 struct list_head list;
480 u8 *start;
481 u8 *end;
482};
483
484static int rx_ranges_cmp(void *priv, const struct list_head *a,
485 const struct list_head *b)
486{
487 struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list);
488 struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list);
489
490 if (rx_a->start > rx_b->start)
491 return 1;
492 if (rx_a->start < rx_b->start)
493 return -1;
494 return 0;
495}
496
497static int spi_check_rx_ranges(struct spi_device *spi,
498 struct spi_message *msg,
499 void *rx)
500{
501 struct spi_transfer *xfer;
502 struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
503 int i = 0;
504 LIST_HEAD(ranges_list);
505 u8 *addr;
506 int ret = 0;
507
508 /* loop over all transfers to fill in the rx_ranges */
509 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
510 /* if there is no rx, then no check is needed */
511 if (!xfer->rx_buf)
512 continue;
513 /* fill in the rx_range */
514 if (RANGE_CHECK(xfer->rx_buf, xfer->len,
515 rx, SPI_TEST_MAX_SIZE_PLUS)) {
516 ranges[i].start = xfer->rx_buf;
517 ranges[i].end = xfer->rx_buf + xfer->len;
518 list_add(&ranges[i].list, &ranges_list);
519 i++;
520 }
521 }
522
523 /* if no ranges, then we can return and avoid the checks...*/
524 if (!i)
525 return 0;
526
527 /* sort the list */
528 list_sort(NULL, &ranges_list, rx_ranges_cmp);
529
530 /* and iterate over all the rx addresses */
531 for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) {
532 /* if we are the DO not write pattern,
533 * then continue with the loop...
534 */
535 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
536 continue;
537
538 /* check if we are inside a range */
539 list_for_each_entry(r, &ranges_list, list) {
540 /* if so then set to end... */
541 if ((addr >= r->start) && (addr < r->end))
542 addr = r->end;
543 }
544 /* second test after a (hopefull) translation */
545 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
546 continue;
547
548 /* if still not found then something has modified too much */
549 /* we could list the "closest" transfer here... */
550 dev_err(&spi->dev,
551 "loopback strangeness - rx changed outside of allowed range at: %pK\n",
552 addr);
553 /* do not return, only set ret,
554 * so that we list all addresses
555 */
556 ret = -ERANGE;
557 }
558
559 return ret;
560}
561
562static int spi_test_check_elapsed_time(struct spi_device *spi,
563 struct spi_test *test)
564{
565 int i;
566 unsigned long long estimated_time = 0;
567 unsigned long long delay_usecs = 0;
568
569 for (i = 0; i < test->transfer_count; i++) {
570 struct spi_transfer *xfer = test->transfers + i;
571 unsigned long long nbits = (unsigned long long)BITS_PER_BYTE *
572 xfer->len;
573
574 delay_usecs += xfer->delay.value;
575 if (!xfer->speed_hz)
576 continue;
577 estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz);
578 }
579
580 estimated_time += delay_usecs * NSEC_PER_USEC;
581 if (test->elapsed_time < estimated_time) {
582 dev_err(&spi->dev,
583 "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n",
584 test->elapsed_time, estimated_time);
585
586 return -EINVAL;
587 }
588
589 return 0;
590}
591
592static int spi_test_check_loopback_result(struct spi_device *spi,
593 struct spi_message *msg,
594 void *tx, void *rx)
595{
596 struct spi_transfer *xfer;
597 u8 rxb, txb;
598 size_t i;
599 int ret;
600
601 /* checks rx_buffer pattern are valid with loopback or without */
602 if (check_ranges) {
603 ret = spi_check_rx_ranges(spi, msg, rx);
604 if (ret)
605 return ret;
606 }
607
608 /* if we run without loopback, then return now */
609 if (!loopback)
610 return 0;
611
612 /* if applicable to transfer check that rx_buf is equal to tx_buf */
613 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
614 /* if there is no rx, then no check is needed */
615 if (!xfer->len || !xfer->rx_buf)
616 continue;
617 /* so depending on tx_buf we need to handle things */
618 if (xfer->tx_buf) {
619 for (i = 0; i < xfer->len; i++) {
620 txb = ((u8 *)xfer->tx_buf)[i];
621 rxb = ((u8 *)xfer->rx_buf)[i];
622 if (txb != rxb)
623 goto mismatch_error;
624 }
625 } else {
626 /* first byte received */
627 txb = ((u8 *)xfer->rx_buf)[0];
628 /* first byte may be 0 or xff */
629 if (!((txb == 0) || (txb == 0xff))) {
630 dev_err(&spi->dev,
631 "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
632 txb);
633 return -EINVAL;
634 }
635 /* check that all bytes are identical */
636 for (i = 1; i < xfer->len; i++) {
637 rxb = ((u8 *)xfer->rx_buf)[i];
638 if (rxb != txb)
639 goto mismatch_error;
640 }
641 }
642 }
643
644 return 0;
645
646mismatch_error:
647 dev_err(&spi->dev,
648 "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
649 i, txb, rxb);
650
651 return -EINVAL;
652}
653
654static int spi_test_translate(struct spi_device *spi,
655 void **ptr, size_t len,
656 void *tx, void *rx)
657{
658 size_t off;
659
660 /* return on null */
661 if (!*ptr)
662 return 0;
663
664 /* in the MAX_SIZE_HALF case modify the pointer */
665 if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF)
666 /* move the pointer to the correct range */
667 *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) -
668 SPI_TEST_MAX_SIZE_HALF;
669
670 /* RX range
671 * - we check against MAX_SIZE_PLUS to allow for automated alignment
672 */
673 if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
674 off = *ptr - RX(0);
675 *ptr = rx + off;
676
677 return 0;
678 }
679
680 /* TX range */
681 if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
682 off = *ptr - TX(0);
683 *ptr = tx + off;
684
685 return 0;
686 }
687
688 dev_err(&spi->dev,
689 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
690 *ptr, *ptr + len,
691 RX(0), RX(SPI_TEST_MAX_SIZE),
692 TX(0), TX(SPI_TEST_MAX_SIZE));
693
694 return -EINVAL;
695}
696
697static int spi_test_fill_pattern(struct spi_device *spi,
698 struct spi_test *test)
699{
700 struct spi_transfer *xfers = test->transfers;
701 u8 *tx_buf;
702 size_t count = 0;
703 int i, j;
704
705#ifdef __BIG_ENDIAN
706#define GET_VALUE_BYTE(value, index, bytes) \
707 (value >> (8 * (bytes - 1 - count % bytes)))
708#else
709#define GET_VALUE_BYTE(value, index, bytes) \
710 (value >> (8 * (count % bytes)))
711#endif
712
713 /* fill all transfers with the pattern requested */
714 for (i = 0; i < test->transfer_count; i++) {
715 /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */
716 if (xfers[i].rx_buf)
717 memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
718 xfers[i].len);
719 /* if tx_buf is NULL then skip */
720 tx_buf = (u8 *)xfers[i].tx_buf;
721 if (!tx_buf)
722 continue;
723 /* modify all the transfers */
724 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
725 /* fill tx */
726 switch (test->fill_option) {
727 case FILL_MEMSET_8:
728 *tx_buf = test->fill_pattern;
729 break;
730 case FILL_MEMSET_16:
731 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
732 count, 2);
733 break;
734 case FILL_MEMSET_24:
735 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
736 count, 3);
737 break;
738 case FILL_MEMSET_32:
739 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
740 count, 4);
741 break;
742 case FILL_COUNT_8:
743 *tx_buf = count;
744 break;
745 case FILL_COUNT_16:
746 *tx_buf = GET_VALUE_BYTE(count, count, 2);
747 break;
748 case FILL_COUNT_24:
749 *tx_buf = GET_VALUE_BYTE(count, count, 3);
750 break;
751 case FILL_COUNT_32:
752 *tx_buf = GET_VALUE_BYTE(count, count, 4);
753 break;
754 case FILL_TRANSFER_BYTE_8:
755 *tx_buf = j;
756 break;
757 case FILL_TRANSFER_BYTE_16:
758 *tx_buf = GET_VALUE_BYTE(j, j, 2);
759 break;
760 case FILL_TRANSFER_BYTE_24:
761 *tx_buf = GET_VALUE_BYTE(j, j, 3);
762 break;
763 case FILL_TRANSFER_BYTE_32:
764 *tx_buf = GET_VALUE_BYTE(j, j, 4);
765 break;
766 case FILL_TRANSFER_NUM:
767 *tx_buf = i;
768 break;
769 default:
770 dev_err(&spi->dev,
771 "unsupported fill_option: %i\n",
772 test->fill_option);
773 return -EINVAL;
774 }
775 }
776 }
777
778 return 0;
779}
780
781static int _spi_test_run_iter(struct spi_device *spi,
782 struct spi_test *test,
783 void *tx, void *rx)
784{
785 struct spi_message *msg = &test->msg;
786 struct spi_transfer *x;
787 int i, ret;
788
789 /* initialize message - zero-filled via static initialization */
790 spi_message_init_no_memset(msg);
791
792 /* fill rx with the DO_NOT_WRITE pattern */
793 memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
794
795 /* add the individual transfers */
796 for (i = 0; i < test->transfer_count; i++) {
797 x = &test->transfers[i];
798
799 /* patch the values of tx_buf */
800 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
801 (void *)tx, rx);
802 if (ret)
803 return ret;
804
805 /* patch the values of rx_buf */
806 ret = spi_test_translate(spi, &x->rx_buf, x->len,
807 (void *)tx, rx);
808 if (ret)
809 return ret;
810
811 /* and add it to the list */
812 spi_message_add_tail(x, msg);
813 }
814
815 /* fill in the transfer buffers with pattern */
816 ret = spi_test_fill_pattern(spi, test);
817 if (ret)
818 return ret;
819
820 /* and execute */
821 if (test->execute_msg)
822 ret = test->execute_msg(spi, test, tx, rx);
823 else
824 ret = spi_test_execute_msg(spi, test, tx, rx);
825
826 /* handle result */
827 if (ret == test->expected_return)
828 return 0;
829
830 dev_err(&spi->dev,
831 "test failed - test returned %i, but we expect %i\n",
832 ret, test->expected_return);
833
834 if (ret)
835 return ret;
836
837 /* if it is 0, as we expected something else,
838 * then return something special
839 */
840 return -EFAULT;
841}
842
843static int spi_test_run_iter(struct spi_device *spi,
844 const struct spi_test *testtemplate,
845 void *tx, void *rx,
846 size_t len,
847 size_t tx_off,
848 size_t rx_off
849 )
850{
851 struct spi_test test;
852 int i, tx_count, rx_count;
853
854 /* copy the test template to test */
855 memcpy(&test, testtemplate, sizeof(test));
856
857 /* if iterate_transfer_mask is not set,
858 * then set it to first transfer only
859 */
860 if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
861 test.iterate_transfer_mask = 1;
862
863 /* count number of transfers with tx/rx_buf != NULL */
864 rx_count = tx_count = 0;
865 for (i = 0; i < test.transfer_count; i++) {
866 if (test.transfers[i].tx_buf)
867 tx_count++;
868 if (test.transfers[i].rx_buf)
869 rx_count++;
870 }
871
872 /* in some iteration cases warn and exit early,
873 * as there is nothing to do, that has not been tested already...
874 */
875 if (tx_off && (!tx_count)) {
876 dev_warn_once(&spi->dev,
877 "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
878 test.description);
879 return 0;
880 }
881 if (rx_off && (!rx_count)) {
882 dev_warn_once(&spi->dev,
883 "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
884 test.description);
885 return 0;
886 }
887
888 /* write out info */
889 if (!(len || tx_off || rx_off)) {
890 dev_info(&spi->dev, "Running test %s\n", test.description);
891 } else {
892 dev_info(&spi->dev,
893 " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
894 len, tx_off, rx_off);
895 }
896
897 /* update in the values from iteration values */
898 for (i = 0; i < test.transfer_count; i++) {
899 /* only when bit in transfer mask is set */
900 if (!(test.iterate_transfer_mask & BIT(i)))
901 continue;
902 test.transfers[i].len = len;
903 if (test.transfers[i].tx_buf)
904 test.transfers[i].tx_buf += tx_off;
905 if (test.transfers[i].rx_buf)
906 test.transfers[i].rx_buf += rx_off;
907 }
908
909 /* and execute */
910 return _spi_test_run_iter(spi, &test, tx, rx);
911}
912
913/**
914 * spi_test_execute_msg - default implementation to run a test
915 *
916 * @spi: @spi_device on which to run the @spi_message
917 * @test: the test to execute, which already contains @msg
918 * @tx: the tx buffer allocated for the test sequence
919 * @rx: the rx buffer allocated for the test sequence
920 *
921 * Returns: error code of spi_sync as well as basic error checking
922 */
923int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
924 void *tx, void *rx)
925{
926 struct spi_message *msg = &test->msg;
927 int ret = 0;
928 int i;
929
930 /* only if we do not simulate */
931 if (!simulate_only) {
932 ktime_t start;
933
934 /* dump the complete message before and after the transfer */
935 if (dump_messages == 3)
936 spi_test_dump_message(spi, msg, true);
937
938 start = ktime_get();
939 /* run spi message */
940 ret = spi_sync(spi, msg);
941 test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start));
942 if (ret == -ETIMEDOUT) {
943 dev_info(&spi->dev,
944 "spi-message timed out - rerunning...\n");
945 /* rerun after a few explicit schedules */
946 for (i = 0; i < 16; i++)
947 schedule();
948 ret = spi_sync(spi, msg);
949 }
950 if (ret) {
951 dev_err(&spi->dev,
952 "Failed to execute spi_message: %i\n",
953 ret);
954 goto exit;
955 }
956
957 /* do some extra error checks */
958 if (msg->frame_length != msg->actual_length) {
959 dev_err(&spi->dev,
960 "actual length differs from expected\n");
961 ret = -EIO;
962 goto exit;
963 }
964
965 /* run rx-buffer tests */
966 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
967 if (ret)
968 goto exit;
969
970 ret = spi_test_check_elapsed_time(spi, test);
971 }
972
973 /* if requested or on error dump message (including data) */
974exit:
975 if (dump_messages || ret)
976 spi_test_dump_message(spi, msg,
977 (dump_messages >= 2) || (ret));
978
979 return ret;
980}
981EXPORT_SYMBOL_GPL(spi_test_execute_msg);
982
983/**
984 * spi_test_run_test - run an individual spi_test
985 * including all the relevant iterations on:
986 * length and buffer alignment
987 *
988 * @spi: the spi_device to send the messages to
989 * @test: the test which we need to execute
990 * @tx: the tx buffer allocated for the test sequence
991 * @rx: the rx buffer allocated for the test sequence
992 *
993 * Returns: status code of spi_sync or other failures
994 */
995
996int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
997 void *tx, void *rx)
998{
999 int idx_len;
1000 size_t len;
1001 size_t tx_align, rx_align;
1002 int ret;
1003
1004 /* test for transfer limits */
1005 if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
1006 dev_err(&spi->dev,
1007 "%s: Exceeded max number of transfers with %i\n",
1008 test->description, test->transfer_count);
1009 return -E2BIG;
1010 }
1011
1012 /* setting up some values in spi_message
1013 * based on some settings in spi_master
1014 * some of this can also get done in the run() method
1015 */
1016
1017 /* iterate over all the iterable values using macros
1018 * (to make it a bit more readable...
1019 */
1020#define FOR_EACH_ALIGNMENT(var) \
1021 for (var = 0; \
1022 var < (test->iterate_##var ? \
1023 (spi->master->dma_alignment ? \
1024 spi->master->dma_alignment : \
1025 test->iterate_##var) : \
1026 1); \
1027 var++)
1028
1029 for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE &&
1030 (len = test->iterate_len[idx_len]) != -1; idx_len++) {
1031 FOR_EACH_ALIGNMENT(tx_align) {
1032 FOR_EACH_ALIGNMENT(rx_align) {
1033 /* and run the iteration */
1034 ret = spi_test_run_iter(spi, test,
1035 tx, rx,
1036 len,
1037 tx_align,
1038 rx_align);
1039 if (ret)
1040 return ret;
1041 }
1042 }
1043 }
1044
1045 return 0;
1046}
1047EXPORT_SYMBOL_GPL(spi_test_run_test);
1048
1049/**
1050 * spi_test_run_tests - run an array of spi_messages tests
1051 * @spi: the spi device on which to run the tests
1052 * @tests: NULL-terminated array of @spi_test
1053 *
1054 * Returns: status errors as per @spi_test_run_test()
1055 */
1056
1057int spi_test_run_tests(struct spi_device *spi,
1058 struct spi_test *tests)
1059{
1060 char *rx = NULL, *tx = NULL;
1061 int ret = 0, count = 0;
1062 struct spi_test *test;
1063
1064 /* allocate rx/tx buffers of 128kB size without devm
1065 * in the hope that is on a page boundary
1066 */
1067 if (use_vmalloc)
1068 rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1069 else
1070 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1071 if (!rx)
1072 return -ENOMEM;
1073
1074
1075 if (use_vmalloc)
1076 tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1077 else
1078 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1079 if (!tx) {
1080 ret = -ENOMEM;
1081 goto err_tx;
1082 }
1083
1084 /* now run the individual tests in the table */
1085 for (test = tests, count = 0; test->description[0];
1086 test++, count++) {
1087 /* only run test if requested */
1088 if ((run_only_test > -1) && (count != run_only_test))
1089 continue;
1090 /* run custom implementation */
1091 if (test->run_test)
1092 ret = test->run_test(spi, test, tx, rx);
1093 else
1094 ret = spi_test_run_test(spi, test, tx, rx);
1095 if (ret)
1096 goto out;
1097 /* add some delays so that we can easily
1098 * detect the individual tests when using a logic analyzer
1099 * we also add scheduling to avoid potential spi_timeouts...
1100 */
1101 mdelay(100);
1102 schedule();
1103 }
1104
1105out:
1106 kvfree(tx);
1107err_tx:
1108 kvfree(rx);
1109 return ret;
1110}
1111EXPORT_SYMBOL_GPL(spi_test_run_tests);
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/list.h>
24#include <linux/list_sort.h>
25#include <linux/module.h>
26#include <linux/of_device.h>
27#include <linux/printk.h>
28#include <linux/spi/spi.h>
29
30#include "spi-test.h"
31
32/* flag to only simulate transfers */
33int simulate_only;
34module_param(simulate_only, int, 0);
35MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message");
36
37/* dump spi messages */
38int dump_messages;
39module_param(dump_messages, int, 0);
40MODULE_PARM_DESC(dump_messages,
41 "=1 dump the basic spi_message_structure, " \
42 "=2 dump the spi_message_structure including data, " \
43 "=3 dump the spi_message structure before and after execution");
44/* the device is jumpered for loopback - enabling some rx_buf tests */
45int loopback;
46module_param(loopback, int, 0);
47MODULE_PARM_DESC(loopback,
48 "if set enable loopback mode, where the rx_buf " \
49 "is checked to match tx_buf after the spi_message " \
50 "is executed");
51
52/* run only a specific test */
53int run_only_test = -1;
54module_param(run_only_test, int, 0);
55MODULE_PARM_DESC(run_only_test,
56 "only run the test with this number (0-based !)");
57
58/* the actual tests to execute */
59static struct spi_test spi_tests[] = {
60 {
61 .description = "tx/rx-transfer - start of page",
62 .fill_option = FILL_COUNT_8,
63 .iterate_len = { ITERATE_MAX_LEN },
64 .iterate_tx_align = ITERATE_ALIGN,
65 .iterate_rx_align = ITERATE_ALIGN,
66 .transfers = {
67 {
68 .len = 1,
69 .tx_buf = TX(0),
70 .rx_buf = RX(0),
71 },
72 },
73 },
74 {
75 .description = "tx/rx-transfer - crossing PAGE_SIZE",
76 .fill_option = FILL_COUNT_8,
77 .iterate_len = { ITERATE_MAX_LEN },
78 .iterate_tx_align = ITERATE_ALIGN,
79 .iterate_rx_align = ITERATE_ALIGN,
80 .transfers = {
81 {
82 .len = 1,
83 .tx_buf = TX(PAGE_SIZE - 4),
84 .rx_buf = RX(PAGE_SIZE - 4),
85 },
86 },
87 },
88 {
89 .description = "tx-transfer - only",
90 .fill_option = FILL_COUNT_8,
91 .iterate_len = { ITERATE_MAX_LEN },
92 .iterate_tx_align = ITERATE_ALIGN,
93 .transfers = {
94 {
95 .len = 1,
96 .tx_buf = TX(0),
97 },
98 },
99 },
100 {
101 .description = "rx-transfer - only",
102 .fill_option = FILL_COUNT_8,
103 .iterate_len = { ITERATE_MAX_LEN },
104 .iterate_rx_align = ITERATE_ALIGN,
105 .transfers = {
106 {
107 .len = 1,
108 .rx_buf = RX(0),
109 },
110 },
111 },
112 {
113 .description = "two tx-transfers - alter both",
114 .fill_option = FILL_COUNT_8,
115 .iterate_len = { ITERATE_LEN },
116 .iterate_tx_align = ITERATE_ALIGN,
117 .iterate_transfer_mask = BIT(0) | BIT(1),
118 .transfers = {
119 {
120 .len = 1,
121 .tx_buf = TX(0),
122 },
123 {
124 .len = 1,
125 /* this is why we cant use ITERATE_MAX_LEN */
126 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
127 },
128 },
129 },
130 {
131 .description = "two tx-transfers - alter first",
132 .fill_option = FILL_COUNT_8,
133 .iterate_len = { ITERATE_MAX_LEN },
134 .iterate_tx_align = ITERATE_ALIGN,
135 .iterate_transfer_mask = BIT(1),
136 .transfers = {
137 {
138 .len = 1,
139 .tx_buf = TX(64),
140 },
141 {
142 .len = 1,
143 .tx_buf = TX(0),
144 },
145 },
146 },
147 {
148 .description = "two tx-transfers - alter second",
149 .fill_option = FILL_COUNT_8,
150 .iterate_len = { ITERATE_MAX_LEN },
151 .iterate_tx_align = ITERATE_ALIGN,
152 .iterate_transfer_mask = BIT(0),
153 .transfers = {
154 {
155 .len = 16,
156 .tx_buf = TX(0),
157 },
158 {
159 .len = 1,
160 .tx_buf = TX(64),
161 },
162 },
163 },
164 {
165 .description = "two transfers tx then rx - alter both",
166 .fill_option = FILL_COUNT_8,
167 .iterate_len = { ITERATE_MAX_LEN },
168 .iterate_tx_align = ITERATE_ALIGN,
169 .iterate_transfer_mask = BIT(0) | BIT(1),
170 .transfers = {
171 {
172 .len = 1,
173 .tx_buf = TX(0),
174 },
175 {
176 .len = 1,
177 .rx_buf = RX(0),
178 },
179 },
180 },
181 {
182 .description = "two transfers tx then rx - alter tx",
183 .fill_option = FILL_COUNT_8,
184 .iterate_len = { ITERATE_MAX_LEN },
185 .iterate_tx_align = ITERATE_ALIGN,
186 .iterate_transfer_mask = BIT(0),
187 .transfers = {
188 {
189 .len = 1,
190 .tx_buf = TX(0),
191 },
192 {
193 .len = 1,
194 .rx_buf = RX(0),
195 },
196 },
197 },
198 {
199 .description = "two transfers tx then rx - alter rx",
200 .fill_option = FILL_COUNT_8,
201 .iterate_len = { ITERATE_MAX_LEN },
202 .iterate_tx_align = ITERATE_ALIGN,
203 .iterate_transfer_mask = BIT(1),
204 .transfers = {
205 {
206 .len = 1,
207 .tx_buf = TX(0),
208 },
209 {
210 .len = 1,
211 .rx_buf = RX(0),
212 },
213 },
214 },
215 {
216 .description = "two tx+rx transfers - alter both",
217 .fill_option = FILL_COUNT_8,
218 .iterate_len = { ITERATE_LEN },
219 .iterate_tx_align = ITERATE_ALIGN,
220 .iterate_transfer_mask = BIT(0) | BIT(1),
221 .transfers = {
222 {
223 .len = 1,
224 .tx_buf = TX(0),
225 .rx_buf = RX(0),
226 },
227 {
228 .len = 1,
229 /* making sure we align without overwrite
230 * the reason we can not use ITERATE_MAX_LEN
231 */
232 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
233 .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF),
234 },
235 },
236 },
237 {
238 .description = "two tx+rx transfers - alter first",
239 .fill_option = FILL_COUNT_8,
240 .iterate_len = { ITERATE_MAX_LEN },
241 .iterate_tx_align = ITERATE_ALIGN,
242 .iterate_transfer_mask = BIT(0),
243 .transfers = {
244 {
245 .len = 1,
246 /* making sure we align without overwrite */
247 .tx_buf = TX(1024),
248 .rx_buf = RX(1024),
249 },
250 {
251 .len = 1,
252 /* making sure we align without overwrite */
253 .tx_buf = TX(0),
254 .rx_buf = RX(0),
255 },
256 },
257 },
258 {
259 .description = "two tx+rx transfers - alter second",
260 .fill_option = FILL_COUNT_8,
261 .iterate_len = { ITERATE_MAX_LEN },
262 .iterate_tx_align = ITERATE_ALIGN,
263 .iterate_transfer_mask = BIT(1),
264 .transfers = {
265 {
266 .len = 1,
267 .tx_buf = TX(0),
268 .rx_buf = RX(0),
269 },
270 {
271 .len = 1,
272 /* making sure we align without overwrite */
273 .tx_buf = TX(1024),
274 .rx_buf = RX(1024),
275 },
276 },
277 },
278
279 { /* end of tests sequence */ }
280};
281
282static int spi_loopback_test_probe(struct spi_device *spi)
283{
284 int ret;
285
286 dev_info(&spi->dev, "Executing spi-loopback-tests\n");
287
288 ret = spi_test_run_tests(spi, spi_tests);
289
290 dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
291 ret);
292
293 return ret;
294}
295
296/* non const match table to permit to change via a module parameter */
297static struct of_device_id spi_loopback_test_of_match[] = {
298 { .compatible = "linux,spi-loopback-test", },
299 { }
300};
301
302/* allow to override the compatible string via a module_parameter */
303module_param_string(compatible, spi_loopback_test_of_match[0].compatible,
304 sizeof(spi_loopback_test_of_match[0].compatible),
305 0000);
306
307MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
308
309static struct spi_driver spi_loopback_test_driver = {
310 .driver = {
311 .name = "spi-loopback-test",
312 .owner = THIS_MODULE,
313 .of_match_table = spi_loopback_test_of_match,
314 },
315 .probe = spi_loopback_test_probe,
316};
317
318module_spi_driver(spi_loopback_test_driver);
319
320MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
321MODULE_DESCRIPTION("test spi_driver to check core functionality");
322MODULE_LICENSE("GPL");
323
324/*-------------------------------------------------------------------------*/
325
326/* spi_test implementation */
327
328#define RANGE_CHECK(ptr, plen, start, slen) \
329 ((ptr >= start) && (ptr + plen <= start + slen))
330
331/* we allocate one page more, to allow for offsets */
332#define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
333
334static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
335{
336 /* limit the hex_dump */
337 if (len < 1024) {
338 print_hex_dump(KERN_INFO, pre,
339 DUMP_PREFIX_OFFSET, 16, 1,
340 ptr, len, 0);
341 return;
342 }
343 /* print head */
344 print_hex_dump(KERN_INFO, pre,
345 DUMP_PREFIX_OFFSET, 16, 1,
346 ptr, 512, 0);
347 /* print tail */
348 pr_info("%s truncated - continuing at offset %04zx\n",
349 pre, len - 512);
350 print_hex_dump(KERN_INFO, pre,
351 DUMP_PREFIX_OFFSET, 16, 1,
352 ptr + (len - 512), 512, 0);
353}
354
355static void spi_test_dump_message(struct spi_device *spi,
356 struct spi_message *msg,
357 bool dump_data)
358{
359 struct spi_transfer *xfer;
360 int i;
361 u8 b;
362
363 dev_info(&spi->dev, " spi_msg@%pK\n", msg);
364 if (msg->status)
365 dev_info(&spi->dev, " status: %i\n",
366 msg->status);
367 dev_info(&spi->dev, " frame_length: %i\n",
368 msg->frame_length);
369 dev_info(&spi->dev, " actual_length: %i\n",
370 msg->actual_length);
371
372 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
373 dev_info(&spi->dev, " spi_transfer@%pK\n", xfer);
374 dev_info(&spi->dev, " len: %i\n", xfer->len);
375 dev_info(&spi->dev, " tx_buf: %pK\n", xfer->tx_buf);
376 if (dump_data && xfer->tx_buf)
377 spi_test_print_hex_dump(" TX: ",
378 xfer->tx_buf,
379 xfer->len);
380
381 dev_info(&spi->dev, " rx_buf: %pK\n", xfer->rx_buf);
382 if (dump_data && xfer->rx_buf)
383 spi_test_print_hex_dump(" RX: ",
384 xfer->rx_buf,
385 xfer->len);
386 /* check for unwritten test pattern on rx_buf */
387 if (xfer->rx_buf) {
388 for (i = 0 ; i < xfer->len ; i++) {
389 b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i];
390 if (b != SPI_TEST_PATTERN_UNWRITTEN)
391 break;
392 }
393 if (i)
394 dev_info(&spi->dev,
395 " rx_buf filled with %02x starts at offset: %i\n",
396 SPI_TEST_PATTERN_UNWRITTEN,
397 xfer->len - i);
398 }
399 }
400}
401
402struct rx_ranges {
403 struct list_head list;
404 u8 *start;
405 u8 *end;
406};
407
408int rx_ranges_cmp(void *priv, struct list_head *a, struct list_head *b)
409{
410 struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list);
411 struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list);
412
413 if (rx_a->start > rx_b->start)
414 return 1;
415 if (rx_a->start < rx_b->start)
416 return -1;
417 return 0;
418}
419
420static int spi_check_rx_ranges(struct spi_device *spi,
421 struct spi_message *msg,
422 void *rx)
423{
424 struct spi_transfer *xfer;
425 struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
426 int i = 0;
427 LIST_HEAD(ranges_list);
428 u8 *addr;
429 int ret = 0;
430
431 /* loop over all transfers to fill in the rx_ranges */
432 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
433 /* if there is no rx, then no check is needed */
434 if (!xfer->rx_buf)
435 continue;
436 /* fill in the rx_range */
437 if (RANGE_CHECK(xfer->rx_buf, xfer->len,
438 rx, SPI_TEST_MAX_SIZE_PLUS)) {
439 ranges[i].start = xfer->rx_buf;
440 ranges[i].end = xfer->rx_buf + xfer->len;
441 list_add(&ranges[i].list, &ranges_list);
442 i++;
443 }
444 }
445
446 /* if no ranges, then we can return and avoid the checks...*/
447 if (!i)
448 return 0;
449
450 /* sort the list */
451 list_sort(NULL, &ranges_list, rx_ranges_cmp);
452
453 /* and iterate over all the rx addresses */
454 for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) {
455 /* if we are the DO not write pattern,
456 * then continue with the loop...
457 */
458 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
459 continue;
460
461 /* check if we are inside a range */
462 list_for_each_entry(r, &ranges_list, list) {
463 /* if so then set to end... */
464 if ((addr >= r->start) && (addr < r->end))
465 addr = r->end;
466 }
467 /* second test after a (hopefull) translation */
468 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
469 continue;
470
471 /* if still not found then something has modified too much */
472 /* we could list the "closest" transfer here... */
473 dev_err(&spi->dev,
474 "loopback strangeness - rx changed outside of allowed range at: %pK\n",
475 addr);
476 /* do not return, only set ret,
477 * so that we list all addresses
478 */
479 ret = -ERANGE;
480 }
481
482 return ret;
483}
484
485static int spi_test_check_loopback_result(struct spi_device *spi,
486 struct spi_message *msg,
487 void *tx, void *rx)
488{
489 struct spi_transfer *xfer;
490 u8 rxb, txb;
491 size_t i;
492 int ret;
493
494 /* checks rx_buffer pattern are valid with loopback or without */
495 ret = spi_check_rx_ranges(spi, msg, rx);
496 if (ret)
497 return ret;
498
499 /* if we run without loopback, then return now */
500 if (!loopback)
501 return 0;
502
503 /* if applicable to transfer check that rx_buf is equal to tx_buf */
504 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
505 /* if there is no rx, then no check is needed */
506 if (!xfer->rx_buf)
507 continue;
508 /* so depending on tx_buf we need to handle things */
509 if (xfer->tx_buf) {
510 for (i = 1; i < xfer->len; i++) {
511 txb = ((u8 *)xfer->tx_buf)[i];
512 rxb = ((u8 *)xfer->rx_buf)[i];
513 if (txb != rxb)
514 goto mismatch_error;
515 }
516 } else {
517 /* first byte received */
518 txb = ((u8 *)xfer->rx_buf)[0];
519 /* first byte may be 0 or xff */
520 if (!((txb == 0) || (txb == 0xff))) {
521 dev_err(&spi->dev,
522 "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
523 txb);
524 return -EINVAL;
525 }
526 /* check that all bytes are identical */
527 for (i = 1; i < xfer->len; i++) {
528 rxb = ((u8 *)xfer->rx_buf)[i];
529 if (rxb != txb)
530 goto mismatch_error;
531 }
532 }
533 }
534
535 return 0;
536
537mismatch_error:
538 dev_err(&spi->dev,
539 "loopback strangeness - transfer missmatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
540 i, txb, rxb);
541
542 return -EINVAL;
543}
544
545static int spi_test_translate(struct spi_device *spi,
546 void **ptr, size_t len,
547 void *tx, void *rx)
548{
549 size_t off;
550
551 /* return on null */
552 if (!*ptr)
553 return 0;
554
555 /* in the MAX_SIZE_HALF case modify the pointer */
556 if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF)
557 /* move the pointer to the correct range */
558 *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) -
559 SPI_TEST_MAX_SIZE_HALF;
560
561 /* RX range
562 * - we check against MAX_SIZE_PLUS to allow for automated alignment
563 */
564 if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
565 off = *ptr - RX(0);
566 *ptr = rx + off;
567
568 return 0;
569 }
570
571 /* TX range */
572 if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
573 off = *ptr - TX(0);
574 *ptr = tx + off;
575
576 return 0;
577 }
578
579 dev_err(&spi->dev,
580 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
581 *ptr, *ptr + len,
582 RX(0), RX(SPI_TEST_MAX_SIZE),
583 TX(0), TX(SPI_TEST_MAX_SIZE));
584
585 return -EINVAL;
586}
587
588static int spi_test_fill_pattern(struct spi_device *spi,
589 struct spi_test *test)
590{
591 struct spi_transfer *xfers = test->transfers;
592 u8 *tx_buf;
593 size_t count = 0;
594 int i, j;
595
596#ifdef __BIG_ENDIAN
597#define GET_VALUE_BYTE(value, index, bytes) \
598 (value >> (8 * (bytes - 1 - count % bytes)))
599#else
600#define GET_VALUE_BYTE(value, index, bytes) \
601 (value >> (8 * (count % bytes)))
602#endif
603
604 /* fill all transfers with the pattern requested */
605 for (i = 0; i < test->transfer_count; i++) {
606 /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */
607 if (xfers[i].rx_buf)
608 memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
609 xfers[i].len);
610 /* if tx_buf is NULL then skip */
611 tx_buf = (u8 *)xfers[i].tx_buf;
612 if (!tx_buf)
613 continue;
614 /* modify all the transfers */
615 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
616 /* fill tx */
617 switch (test->fill_option) {
618 case FILL_MEMSET_8:
619 *tx_buf = test->fill_pattern;
620 break;
621 case FILL_MEMSET_16:
622 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
623 count, 2);
624 break;
625 case FILL_MEMSET_24:
626 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
627 count, 3);
628 break;
629 case FILL_MEMSET_32:
630 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
631 count, 4);
632 break;
633 case FILL_COUNT_8:
634 *tx_buf = count;
635 break;
636 case FILL_COUNT_16:
637 *tx_buf = GET_VALUE_BYTE(count, count, 2);
638 break;
639 case FILL_COUNT_24:
640 *tx_buf = GET_VALUE_BYTE(count, count, 3);
641 break;
642 case FILL_COUNT_32:
643 *tx_buf = GET_VALUE_BYTE(count, count, 4);
644 break;
645 case FILL_TRANSFER_BYTE_8:
646 *tx_buf = j;
647 break;
648 case FILL_TRANSFER_BYTE_16:
649 *tx_buf = GET_VALUE_BYTE(j, j, 2);
650 break;
651 case FILL_TRANSFER_BYTE_24:
652 *tx_buf = GET_VALUE_BYTE(j, j, 3);
653 break;
654 case FILL_TRANSFER_BYTE_32:
655 *tx_buf = GET_VALUE_BYTE(j, j, 4);
656 break;
657 case FILL_TRANSFER_NUM:
658 *tx_buf = i;
659 break;
660 default:
661 dev_err(&spi->dev,
662 "unsupported fill_option: %i\n",
663 test->fill_option);
664 return -EINVAL;
665 }
666 }
667 }
668
669 return 0;
670}
671
672static int _spi_test_run_iter(struct spi_device *spi,
673 struct spi_test *test,
674 void *tx, void *rx)
675{
676 struct spi_message *msg = &test->msg;
677 struct spi_transfer *x;
678 int i, ret;
679
680 /* initialize message - zero-filled via static initialization */
681 spi_message_init_no_memset(msg);
682
683 /* fill rx with the DO_NOT_WRITE pattern */
684 memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
685
686 /* add the individual transfers */
687 for (i = 0; i < test->transfer_count; i++) {
688 x = &test->transfers[i];
689
690 /* patch the values of tx_buf */
691 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
692 (void *)tx, rx);
693 if (ret)
694 return ret;
695
696 /* patch the values of rx_buf */
697 ret = spi_test_translate(spi, &x->rx_buf, x->len,
698 (void *)tx, rx);
699 if (ret)
700 return ret;
701
702 /* and add it to the list */
703 spi_message_add_tail(x, msg);
704 }
705
706 /* fill in the transfer buffers with pattern */
707 ret = spi_test_fill_pattern(spi, test);
708 if (ret)
709 return ret;
710
711 /* and execute */
712 if (test->execute_msg)
713 ret = test->execute_msg(spi, test, tx, rx);
714 else
715 ret = spi_test_execute_msg(spi, test, tx, rx);
716
717 /* handle result */
718 if (ret == test->expected_return)
719 return 0;
720
721 dev_err(&spi->dev,
722 "test failed - test returned %i, but we expect %i\n",
723 ret, test->expected_return);
724
725 if (ret)
726 return ret;
727
728 /* if it is 0, as we expected something else,
729 * then return something special
730 */
731 return -EFAULT;
732}
733
734static int spi_test_run_iter(struct spi_device *spi,
735 const struct spi_test *testtemplate,
736 void *tx, void *rx,
737 size_t len,
738 size_t tx_off,
739 size_t rx_off
740 )
741{
742 struct spi_test test;
743 int i, tx_count, rx_count;
744
745 /* copy the test template to test */
746 memcpy(&test, testtemplate, sizeof(test));
747
748 /* set up test->transfers to the correct count */
749 if (!test.transfer_count) {
750 for (i = 0;
751 (i < SPI_TEST_MAX_TRANSFERS) && test.transfers[i].len;
752 i++) {
753 test.transfer_count++;
754 }
755 }
756
757 /* if iterate_transfer_mask is not set,
758 * then set it to first transfer only
759 */
760 if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
761 test.iterate_transfer_mask = 1;
762
763 /* count number of transfers with tx/rx_buf != NULL */
764 rx_count = tx_count = 0;
765 for (i = 0; i < test.transfer_count; i++) {
766 if (test.transfers[i].tx_buf)
767 tx_count++;
768 if (test.transfers[i].rx_buf)
769 rx_count++;
770 }
771
772 /* in some iteration cases warn and exit early,
773 * as there is nothing to do, that has not been tested already...
774 */
775 if (tx_off && (!tx_count)) {
776 dev_warn_once(&spi->dev,
777 "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
778 test.description);
779 return 0;
780 }
781 if (rx_off && (!rx_count)) {
782 dev_warn_once(&spi->dev,
783 "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
784 test.description);
785 return 0;
786 }
787
788 /* write out info */
789 if (!(len || tx_off || rx_off)) {
790 dev_info(&spi->dev, "Running test %s\n", test.description);
791 } else {
792 dev_info(&spi->dev,
793 " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
794 len, tx_off, rx_off);
795 }
796
797 /* update in the values from iteration values */
798 for (i = 0; i < test.transfer_count; i++) {
799 /* only when bit in transfer mask is set */
800 if (!(test.iterate_transfer_mask & BIT(i)))
801 continue;
802 if (len)
803 test.transfers[i].len = len;
804 if (test.transfers[i].tx_buf)
805 test.transfers[i].tx_buf += tx_off;
806 if (test.transfers[i].tx_buf)
807 test.transfers[i].rx_buf += rx_off;
808 }
809
810 /* and execute */
811 return _spi_test_run_iter(spi, &test, tx, rx);
812}
813
814/**
815 * spi_test_execute_msg - default implementation to run a test
816 *
817 * spi: @spi_device on which to run the @spi_message
818 * test: the test to execute, which already contains @msg
819 * tx: the tx buffer allocated for the test sequence
820 * rx: the rx buffer allocated for the test sequence
821 *
822 * Returns: error code of spi_sync as well as basic error checking
823 */
824int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
825 void *tx, void *rx)
826{
827 struct spi_message *msg = &test->msg;
828 int ret = 0;
829 int i;
830
831 /* only if we do not simulate */
832 if (!simulate_only) {
833 /* dump the complete message before and after the transfer */
834 if (dump_messages == 3)
835 spi_test_dump_message(spi, msg, true);
836
837 /* run spi message */
838 ret = spi_sync(spi, msg);
839 if (ret == -ETIMEDOUT) {
840 dev_info(&spi->dev,
841 "spi-message timed out - reruning...\n");
842 /* rerun after a few explicit schedules */
843 for (i = 0; i < 16; i++)
844 schedule();
845 ret = spi_sync(spi, msg);
846 }
847 if (ret) {
848 dev_err(&spi->dev,
849 "Failed to execute spi_message: %i\n",
850 ret);
851 goto exit;
852 }
853
854 /* do some extra error checks */
855 if (msg->frame_length != msg->actual_length) {
856 dev_err(&spi->dev,
857 "actual length differs from expected\n");
858 ret = -EIO;
859 goto exit;
860 }
861
862 /* run rx-buffer tests */
863 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
864 }
865
866 /* if requested or on error dump message (including data) */
867exit:
868 if (dump_messages || ret)
869 spi_test_dump_message(spi, msg,
870 (dump_messages >= 2) || (ret));
871
872 return ret;
873}
874EXPORT_SYMBOL_GPL(spi_test_execute_msg);
875
876/**
877 * spi_test_run_test - run an individual spi_test
878 * including all the relevant iterations on:
879 * length and buffer alignment
880 *
881 * spi: the spi_device to send the messages to
882 * test: the test which we need to execute
883 * tx: the tx buffer allocated for the test sequence
884 * rx: the rx buffer allocated for the test sequence
885 *
886 * Returns: status code of spi_sync or other failures
887 */
888
889int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
890 void *tx, void *rx)
891{
892 int idx_len;
893 size_t len;
894 size_t tx_align, rx_align;
895 int ret;
896
897 /* test for transfer limits */
898 if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
899 dev_err(&spi->dev,
900 "%s: Exceeded max number of transfers with %i\n",
901 test->description, test->transfer_count);
902 return -E2BIG;
903 }
904
905 /* setting up some values in spi_message
906 * based on some settings in spi_master
907 * some of this can also get done in the run() method
908 */
909
910 /* iterate over all the iterable values using macros
911 * (to make it a bit more readable...
912 */
913#define FOR_EACH_ITERATE(var, defaultvalue) \
914 for (idx_##var = -1, var = defaultvalue; \
915 ((idx_##var < 0) || \
916 ( \
917 (idx_##var < SPI_TEST_MAX_ITERATE) && \
918 (var = test->iterate_##var[idx_##var]) \
919 ) \
920 ); \
921 idx_##var++)
922#define FOR_EACH_ALIGNMENT(var) \
923 for (var = 0; \
924 var < (test->iterate_##var ? \
925 (spi->master->dma_alignment ? \
926 spi->master->dma_alignment : \
927 test->iterate_##var) : \
928 1); \
929 var++)
930
931 FOR_EACH_ITERATE(len, 0) {
932 FOR_EACH_ALIGNMENT(tx_align) {
933 FOR_EACH_ALIGNMENT(rx_align) {
934 /* and run the iteration */
935 ret = spi_test_run_iter(spi, test,
936 tx, rx,
937 len,
938 tx_align,
939 rx_align);
940 if (ret)
941 return ret;
942 }
943 }
944 }
945
946 return 0;
947}
948EXPORT_SYMBOL_GPL(spi_test_run_test);
949
950/**
951 * spi_test_run_tests - run an array of spi_messages tests
952 * @spi: the spi device on which to run the tests
953 * @tests: NULL-terminated array of @spi_test
954 *
955 * Returns: status errors as per @spi_test_run_test()
956 */
957
958int spi_test_run_tests(struct spi_device *spi,
959 struct spi_test *tests)
960{
961 char *rx = NULL, *tx = NULL;
962 int ret = 0, count = 0;
963 struct spi_test *test;
964
965 /* allocate rx/tx buffers of 128kB size without devm
966 * in the hope that is on a page boundary
967 */
968 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
969 if (!rx) {
970 ret = -ENOMEM;
971 goto out;
972 }
973
974 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
975 if (!tx) {
976 ret = -ENOMEM;
977 goto out;
978 }
979
980 /* now run the individual tests in the table */
981 for (test = tests, count = 0; test->description[0];
982 test++, count++) {
983 /* only run test if requested */
984 if ((run_only_test > -1) && (count != run_only_test))
985 continue;
986 /* run custom implementation */
987 if (test->run_test)
988 ret = test->run_test(spi, test, tx, rx);
989 else
990 ret = spi_test_run_test(spi, test, tx, rx);
991 if (ret)
992 goto out;
993 /* add some delays so that we can easily
994 * detect the individual tests when using a logic analyzer
995 * we also add scheduling to avoid potential spi_timeouts...
996 */
997 mdelay(100);
998 schedule();
999 }
1000
1001out:
1002 kfree(rx);
1003 kfree(tx);
1004 return ret;
1005}
1006EXPORT_SYMBOL_GPL(spi_test_run_tests);