Context Navigation

source: rtems/c/src/libchip/i2c/spi-sd-card.c @ 7660e8b3

4.115

Last change on this file since 7660e8b3 was 7660e8b3, checked in by Sebastian Huber <sebastian.huber@…>, on 07/23/13 at 11:32:58
Include missing <string.h>
Property mode set to `100644`
File size: 37.3 KB

Line
1	/**
2	* @file
3	*
4	* @brief SD Card LibI2C driver.
5	*/
6
7	/*
8	* Copyright (c) 2008
9	* Embedded Brains GmbH
10	* Obere Lagerstr. 30
11	* D-82178 Puchheim
12	* Germany
13	* rtems@embedded-brains.de
14	*
15	* The license and distribution terms for this file may be
16	* found in the file LICENSE in this distribution or at
17	* http://www.rtems.com/license/LICENSE.
18	*/
19
20	#include <stdio.h>
21	#include <string.h>
22	#include <errno.h>
23	#include <inttypes.h>
24
25	#include <rtems.h>
26	#include <rtems/libi2c.h>
27	#include <rtems/libio.h>
28	#include <rtems/diskdevs.h>
29	#include <rtems/blkdev.h>
30
31	#include <libchip/spi-sd-card.h>
32
33	#include <rtems/status-checks.h>
34
35	/**
36	* @name Integer to and from Byte-Stream Converter
37	* @{
38	*/
39
40	static inline uint16_t sd_card_get_uint16( const uint8_t *s)
41	{
42	return (uint16_t) ((s [0] << 8) \| s [1]);
43	}
44
45	static inline uint32_t sd_card_get_uint32( const uint8_t *s)
46	{
47	return ((uint32_t) s [0] << 24) \| ((uint32_t) s [1] << 16) \| ((uint32_t) s [2] << 8) \| (uint32_t) s [3];
48	}
49
50	static inline void sd_card_put_uint16( uint16_t v, uint8_t *s)
51	{
52	*s++ = (uint8_t) (v >> 8);
53	*s = (uint8_t) (v);
54	}
55
56	static inline void sd_card_put_uint32( uint32_t v, uint8_t *s)
57	{
58	*s++ = (uint8_t) (v >> 24);
59	*s++ = (uint8_t) (v >> 16);
60	*s++ = (uint8_t) (v >> 8);
61	*s = (uint8_t) (v);
62	}
63
64	/** @} */
65
66	#define SD_CARD_BUSY_TOKEN 0
67
68	#define SD_CARD_BLOCK_SIZE_DEFAULT 512
69
70	#define SD_CARD_COMMAND_RESPONSE_START 7
71
72	/**
73	* @name Commands
74	* @{
75	*/
76
77	#define SD_CARD_CMD_GO_IDLE_STATE 0
78	#define SD_CARD_CMD_SEND_OP_COND 1
79	#define SD_CARD_CMD_SEND_IF_COND 8
80	#define SD_CARD_CMD_SEND_CSD 9
81	#define SD_CARD_CMD_SEND_CID 10
82	#define SD_CARD_CMD_STOP_TRANSMISSION 12
83	#define SD_CARD_CMD_SEND_STATUS 13
84	#define SD_CARD_CMD_SET_BLOCKLEN 16
85	#define SD_CARD_CMD_READ_SINGLE_BLOCK 17
86	#define SD_CARD_CMD_READ_MULTIPLE_BLOCK 18
87	#define SD_CARD_CMD_SET_BLOCK_COUNT 23
88	#define SD_CARD_CMD_WRITE_BLOCK 24
89	#define SD_CARD_CMD_WRITE_MULTIPLE_BLOCK 25
90	#define SD_CARD_CMD_PROGRAM_CSD 27
91	#define SD_CARD_CMD_SET_WRITE_PROT 28
92	#define SD_CARD_CMD_CLR_WRITE_PROT 29
93	#define SD_CARD_CMD_SEND_WRITE_PROT 30
94	#define SD_CARD_CMD_TAG_SECTOR_START 32
95	#define SD_CARD_CMD_TAG_SECTOR_END 33
96	#define SD_CARD_CMD_UNTAG_SECTOR 34
97	#define SD_CARD_CMD_TAG_ERASE_GROUP_START 35
98	#define SD_CARD_CMD_TAG_ERASE_GROUP_END 36
99	#define SD_CARD_CMD_UNTAG_ERASE_GROUP 37
100	#define SD_CARD_CMD_ERASE 38
101	#define SD_CARD_CMD_LOCK_UNLOCK 42
102	#define SD_CARD_CMD_APP_CMD 55
103	#define SD_CARD_CMD_GEN_CND 56
104	#define SD_CARD_CMD_READ_OCR 58
105	#define SD_CARD_CMD_CRC_ON_OFF 59
106
107	/** @} */
108
109	/**
110	* @name Application Commands
111	* @{
112	*/
113
114	#define SD_CARD_ACMD_SD_SEND_OP_COND 41
115
116	/** @} */
117
118	/**
119	* @name Command Flags
120	* @{
121	*/
122
123	#define SD_CARD_FLAG_HCS 0x40000000U
124
125	#define SD_CARD_FLAG_VHS_2_7_TO_3_3 0x00000100U
126
127	#define SD_CARD_FLAG_CHECK_PATTERN 0x000000aaU
128
129	/** @} */
130
131	/**
132	* @name Command Fields
133	* @{
134	*/
135
136	#define SD_CARD_COMMAND_SET_COMMAND( c, cmd) (c) [1] = (uint8_t) (0x40 + ((cmd) & 0x3f))
137
138	#define SD_CARD_COMMAND_SET_ARGUMENT( c, arg) sd_card_put_uint32( (arg), &((c) [2]))
139
140	#define SD_CARD_COMMAND_SET_CRC7( c, crc7) ((c) [6] = ((crc7) << 1) \| 1U)
141
142	#define SD_CARD_COMMAND_GET_CRC7( c) ((c) [6] >> 1)
143
144	/** @} */
145
146	/**
147	* @name Response Fields
148	* @{
149	*/
150
151	#define SD_CARD_IS_RESPONSE( r) (((r) & 0x80) == 0)
152
153	#define SD_CARD_IS_ERRORLESS_RESPONSE( r) (((r) & 0x7e) == 0)
154
155	#define SD_CARD_IS_NOT_IDLE_RESPONSE( r) (((r) & 0x81) == 0)
156
157	#define SD_CARD_IS_DATA_ERROR( r) (((r) & 0xe0) == 0)
158
159	#define SD_CARD_IS_DATA_REJECTED( r) (((r) & 0x1f) != 0x05)
160
161	/** @} */
162
163	/**
164	* @name Card Identification
165	* @{
166	*/
167
168	#define SD_CARD_CID_SIZE 16
169
170	#define SD_CARD_CID_GET_MID( cid) ((cid) [0])
171	#define SD_CARD_CID_GET_OID( cid) sd_card_get_uint16( cid + 1)
172	#define SD_CARD_CID_GET_PNM( cid, i) ((char) (cid) [3 + (i)])
173	#define SD_CARD_CID_GET_PRV( cid) ((cid) [9])
174	#define SD_CARD_CID_GET_PSN( cid) sd_card_get_uint32( cid + 10)
175	#define SD_CARD_CID_GET_MDT( cid) ((cid) [14])
176	#define SD_CARD_CID_GET_CRC7( cid) ((cid) [15] >> 1)
177
178	/** @} */
179
180	/**
181	* @name Card Specific Data
182	* @{
183	*/
184
185	#define SD_CARD_CSD_SIZE 16
186
187	#define SD_CARD_CSD_GET_CSD_STRUCTURE( csd) ((csd) [0] >> 6)
188	#define SD_CARD_CSD_GET_SPEC_VERS( csd) (((csd) [0] >> 2) & 0xf)
189	#define SD_CARD_CSD_GET_TAAC( csd) ((csd) [1])
190	#define SD_CARD_CSD_GET_NSAC( csd) ((uint32_t) (csd) [2])
191	#define SD_CARD_CSD_GET_TRAN_SPEED( csd) ((csd) [3])
192	#define SD_CARD_CSD_GET_C_SIZE( csd) ((((uint32_t) (csd) [6] & 0x3) << 10) + (((uint32_t) (csd) [7]) << 2) + ((((uint32_t) (csd) [8]) >> 6) & 0x3))
193	#define SD_CARD_CSD_GET_C_SIZE_MULT( csd) ((((csd) [9] & 0x3) << 1) + (((csd) [10] >> 7) & 0x1))
194	#define SD_CARD_CSD_GET_READ_BLK_LEN( csd) ((uint32_t) (csd) [5] & 0xf)
195	#define SD_CARD_CSD_GET_WRITE_BLK_LEN( csd) ((((uint32_t) (csd) [12] & 0x3) << 2) + ((((uint32_t) (csd) [13]) >> 6) & 0x3))
196	#define SD_CARD_CSD_1_GET_C_SIZE( csd) ((((uint32_t) (csd) [7] & 0x3f) << 16) + (((uint32_t) (csd) [8]) << 8) + (uint32_t) (csd) [9])
197
198	/** @} */
199
200	#define SD_CARD_INVALIDATE_RESPONSE_INDEX( e) e->response_index = SD_CARD_COMMAND_SIZE
201
202	/**
203	* @name Data Start and Stop Tokens
204	* @{
205	*/
206
207	#define SD_CARD_START_BLOCK_SINGLE_BLOCK_READ 0xfe
208	#define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ 0xfe
209	#define SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE 0xfe
210	#define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE 0xfc
211	#define SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE 0xfd
212
213	/** @} */
214
215	/**
216	* @name Card Specific Data Functions
217	* @{
218	*/
219
220	static inline uint32_t sd_card_block_number( const uint8_t *csd)
221	{
222	uint32_t size = SD_CARD_CSD_GET_C_SIZE( csd);
223	uint32_t mult = 1U << (SD_CARD_CSD_GET_C_SIZE_MULT( csd) + 2);
224	return (size + 1) * mult;
225	}
226
227	static inline uint32_t sd_card_capacity( const uint8_t *csd)
228	{
229	uint32_t block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( csd);
230	return sd_card_block_number( csd) * block_size;
231	}
232
233	static inline uint32_t sd_card_transfer_speed( const uint8_t *csd)
234	{
235	uint32_t s = SD_CARD_CSD_GET_TRAN_SPEED( csd);
236	uint32_t e = s & 0x7;
237	uint32_t m = s >> 3;
238	switch (e) {
239	case 0: s = 10000; break;
240	case 1: s = 100000; break;
241	case 2: s = 1000000; break;
242	case 3: s = 10000000; break;
243	default: s = 0; break;
244	}
245	switch (m) {
246	case 1: s *= 10; break;
247	case 2: s *= 12; break;
248	case 3: s *= 13; break;
249	case 4: s *= 15; break;
250	case 5: s *= 20; break;
251	case 6: s *= 25; break;
252	case 7: s *= 30; break;
253	case 8: s *= 35; break;
254	case 9: s *= 40; break;
255	case 10: s *= 45; break;
256	case 11: s *= 50; break;
257	case 12: s *= 55; break;
258	case 13: s *= 60; break;
259	case 14: s *= 70; break;
260	case 15: s *= 80; break;
261	default: s *= 0; break;
262	}
263	return s;
264	}
265
266	static inline uint32_t sd_card_access_time( const uint8_t *csd)
267	{
268	uint32_t ac = SD_CARD_CSD_GET_TAAC( csd);
269	uint32_t e = ac & 0x7;
270	uint32_t m = ac >> 3;
271	switch (e) {
272	case 0: ac = 1; break;
273	case 1: ac = 10; break;
274	case 2: ac = 100; break;
275	case 3: ac = 1000; break;
276	case 4: ac = 10000; break;
277	case 5: ac = 100000; break;
278	case 6: ac = 1000000; break;
279	case 7: ac = 10000000; break;
280	default: ac = 0; break;
281	}
282	switch (m) {
283	case 1: ac *= 10; break;
284	case 2: ac *= 12; break;
285	case 3: ac *= 13; break;
286	case 4: ac *= 15; break;
287	case 5: ac *= 20; break;
288	case 6: ac *= 25; break;
289	case 7: ac *= 30; break;
290	case 8: ac *= 35; break;
291	case 9: ac *= 40; break;
292	case 10: ac *= 45; break;
293	case 11: ac *= 50; break;
294	case 12: ac *= 55; break;
295	case 13: ac *= 60; break;
296	case 14: ac *= 70; break;
297	case 15: ac *= 80; break;
298	default: ac *= 0; break;
299	}
300	return ac / 10;
301	}
302
303	static inline uint32_t sd_card_max_access_time( const uint8_t *csd, uint32_t transfer_speed)
304	{
305	uint64_t ac = sd_card_access_time( csd);
306	uint32_t ac_100ms = transfer_speed / 80;
307	uint32_t n = SD_CARD_CSD_GET_NSAC( csd) * 100;
308	/* ac is in ns, transfer_speed in bps, max_access_time in bytes.
309	max_access_time is 100 times typical access time (taac+nsac) */
310	ac = ac * transfer_speed / 80000000;
311	ac = ac + 100*n;
312	if ((uint32_t)ac > ac_100ms)
313	return ac_100ms;
314	else
315	return (uint32_t)ac;
316	}
317
318	/** @} */
319
320	/**
321	* @name CRC functions
322	*
323	* Based on http://en.wikipedia.org/wiki/Computation_of_CRC
324	*
325	* @{
326	*/
327
328	static uint8_t sd_card_compute_crc7 (uint8_t *data, size_t len)
329	{
330	uint8_t e, f, crc;
331	size_t i;
332
333	crc = 0;
334	for (i = 0; i < len; i++) {
335	e = crc ^ data[i];
336	f = e ^ (e >> 4) ^ (e >> 7);
337	crc = (f << 1) ^ (f << 4);
338	}
339	return crc >> 1;
340	}
341
342	static uint16_t sd_card_compute_crc16 (uint8_t *data, size_t len)
343	{
344	uint8_t s, t;
345	uint16_t crc;
346	size_t i;
347
348	crc = 0;
349	for (i = 0; i < len; i++) {
350	s = data[i] ^ (crc >> 8);
351	t = s ^ (s >> 4);
352	crc = (crc << 8) ^ t ^ (t << 5) ^ (t << 12);
353	}
354	return crc;
355	}
356
357	/** @} */
358
359	/**
360	* @name Communication Functions
361	* @{
362	*/
363
364	static inline int sd_card_query( sd_card_driver_entry e, uint8_t in, int n)
365	{
366	return rtems_libi2c_read_bytes( e->bus, in, n);
367	}
368
369	static int sd_card_wait( sd_card_driver_entry *e)
370	{
371	int rv = 0;
372	int r = 0;
373	int n = 2;
374	/* For writes, the timeout is 2.5 times that of reads; since we
375	don't know if it is a write or read, assume write.
376	FIXME should actually look at R2W_FACTOR for non-HC cards. */
377	int retries = e->n_ac_max * 25 / 10;
378	/* n_ac_max/100 is supposed to be the average waiting time. To
379	approximate this, we start with waiting n_ac_max/150 and
380	gradually increase the waiting time. */
381	int wait_time_bytes = (retries + 149) / 150;
382	while (e->busy) {
383	/* Query busy tokens */
384	rv = sd_card_query( e, e->response, n);
385	RTEMS_CHECK_RV( rv, "Busy");
386
387	/* Search for non busy tokens */
388	for (r = 0; r < n; ++r) {
389	if (e->response [r] != SD_CARD_BUSY_TOKEN) {
390	e->busy = false;
391	return 0;
392	}
393	}
394	retries -= n;
395	if (retries <= 0) {
396	return -RTEMS_TIMEOUT;
397	}
398
399	if (e->schedule_if_busy) {
400	uint64_t wait_time_us = wait_time_bytes;
401	wait_time_us *= 8000000;
402	wait_time_us /= e->transfer_mode.baudrate;
403	rtems_task_wake_after( RTEMS_MICROSECONDS_TO_TICKS(wait_time_us));
404	retries -= wait_time_bytes;
405	wait_time_bytes = wait_time_bytes * 15 / 10;
406	} else {
407	n = SD_CARD_COMMAND_SIZE;
408	}
409	}
410	return 0;
411	}
412
413	static int sd_card_send_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument)
414	{
415	int rv = 0;
416	rtems_libi2c_read_write_t rw = {
417	.rd_buf = e->response,
418	.wr_buf = e->command,
419	.byte_cnt = SD_CARD_COMMAND_SIZE
420	};
421	int r = 0;
422	uint8_t crc7;
423
424	SD_CARD_INVALIDATE_RESPONSE_INDEX( e);
425
426	/* Wait until card is not busy */
427	rv = sd_card_wait( e);
428	RTEMS_CHECK_RV( rv, "Wait");
429
430	/* Write command and read response */
431	SD_CARD_COMMAND_SET_COMMAND( e->command, command);
432	SD_CARD_COMMAND_SET_ARGUMENT( e->command, argument);
433	crc7 = sd_card_compute_crc7( e->command + 1, 5);
434	SD_CARD_COMMAND_SET_CRC7( e->command, crc7);
435	rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_READ_WRITE, &rw);
436	RTEMS_CHECK_RV( rv, "Write command and read response");
437
438	/* Check respose */
439	for (r = SD_CARD_COMMAND_RESPONSE_START; r < SD_CARD_COMMAND_SIZE; ++r) {
440	RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, e->response [r]);
441	e->response_index = r;
442	if (SD_CARD_IS_RESPONSE( e->response [r])) {
443	if (SD_CARD_IS_ERRORLESS_RESPONSE( e->response [r])) {
444	return 0;
445	} else {
446	RTEMS_SYSLOG_ERROR( "Command error [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]);
447	goto sd_card_send_command_error;
448	}
449	} else if (e->response [r] != SD_CARD_IDLE_TOKEN) {
450	RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]);
451	goto sd_card_send_command_error;
452	}
453	}
454
455	RTEMS_SYSLOG_ERROR( "Timeout\n");
456
457	sd_card_send_command_error:
458
459	RTEMS_SYSLOG_ERROR( "Response:");
460	for (r = 0; r < SD_CARD_COMMAND_SIZE; ++r) {
461	if (e->response_index == r) {
462	RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":[%02" PRIx8 "]", e->command [r], e->response [r]);
463	} else {
464	RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":%02" PRIx8 "", e->command [r], e->response [r]);
465	}
466	}
467	RTEMS_SYSLOG_PRINT( "\n");
468
469	return -RTEMS_IO_ERROR;
470	}
471
472	static int sd_card_send_register_command( sd_card_driver_entry e, uint32_t command, uint32_t argument, uint32_t reg)
473	{
474	int rv = 0;
475	uint8_t crc7;
476
477	rv = sd_card_send_command( e, command, argument);
478	RTEMS_CHECK_RV( rv, "Send command");
479
480	if (e->response_index + 5 > SD_CARD_COMMAND_SIZE) {
481	/*
482	* TODO: If this happens in the wild we need to implement a
483	* more sophisticated response query.
484	*/
485	RTEMS_SYSLOG_ERROR( "Unexpected response position\n");
486	return -RTEMS_IO_ERROR;
487	}
488
489	crc7 = sd_card_compute_crc7( e->response + e->response_index, 5);
490	if (crc7 != SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) &&
491	SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) != 0x7f) {
492	RTEMS_SYSLOG_ERROR( "CRC check failed on register command\n");
493	return -RTEMS_IO_ERROR;
494	}
495
496	*reg = sd_card_get_uint32( e->response + e->response_index + 1);
497
498	return 0;
499	}
500
501	static int sd_card_stop_multiple_block_read( sd_card_driver_entry *e)
502	{
503	int rv = 0;
504
505	SD_CARD_COMMAND_SET_COMMAND( e->command, SD_CARD_CMD_STOP_TRANSMISSION);
506	rv = rtems_libi2c_write_bytes( e->bus, e->command, SD_CARD_COMMAND_SIZE);
507	RTEMS_CHECK_RV( rv, "Write stop transfer token");
508
509	return 0;
510	}
511
512	static int sd_card_stop_multiple_block_write( sd_card_driver_entry *e)
513	{
514	int rv = 0;
515	uint8_t stop_transfer [3] = { SD_CARD_IDLE_TOKEN, SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE, SD_CARD_IDLE_TOKEN };
516
517	/* Wait until card is not busy */
518	rv = sd_card_wait( e);
519	RTEMS_CHECK_RV( rv, "Wait");
520
521	/* Send stop token */
522	rv = rtems_libi2c_write_bytes( e->bus, stop_transfer, 3);
523	RTEMS_CHECK_RV( rv, "Write stop transfer token");
524
525	/* Card is now busy */
526	e->busy = true;
527
528	return 0;
529	}
530
531	static int sd_card_read( sd_card_driver_entry e, uint8_t start_token, uint8_t in, int n)
532	{
533	int rv = 0;
534
535	/* Discard command response */
536	int r = e->response_index + 1;
537
538	/* Standard response size */
539	int response_size = SD_CARD_COMMAND_SIZE;
540
541	/* Where the response is stored */
542	uint8_t *response = e->response;
543
544	/* Data input index */
545	int i = 0;
546
547	/* CRC check of data */
548	uint16_t crc16;
549
550	/* Maximum number of tokens to read. */
551	int retries = e->n_ac_max;
552
553	SD_CARD_INVALIDATE_RESPONSE_INDEX( e);
554
555	while (true) {
556	RTEMS_DEBUG_PRINT( "Search from %u to %u\n", r, response_size - 1);
557
558	/* Search the data start token in in current response buffer */
559	retries -= (response_size - r);
560	while (r < response_size) {
561	RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, response [r]);
562	if (response [r] == start_token) {
563	/* Discard data start token */
564	++r;
565	goto sd_card_read_start;
566	} else if (SD_CARD_IS_DATA_ERROR( response [r])) {
567	RTEMS_SYSLOG_ERROR( "Data error token [%02i]: 0x%02" PRIx8 "\n", r, response [r]);
568	return -RTEMS_IO_ERROR;
569	} else if (response [r] != SD_CARD_IDLE_TOKEN) {
570	RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, response [r]);
571	return -RTEMS_IO_ERROR;
572	}
573	++r;
574	}
575
576	if (retries <= 0) {
577	RTEMS_SYSLOG_ERROR( "Timeout\n");
578	return -RTEMS_IO_ERROR;
579	}
580
581	if (e->schedule_if_busy)
582	rtems_task_wake_after( RTEMS_YIELD_PROCESSOR);
583
584	/* Query more. We typically have to wait between 10 and 100
585	bytes. To reduce overhead, read the response in chunks of
586	50 bytes - this doesn't introduce too much copy overhead
587	but does allow SPI DMA transfers to work efficiently. */
588	response = in;
589	response_size = 50;
590	if (response_size > n)
591	response_size = n;
592	rv = sd_card_query( e, response, response_size);
593	RTEMS_CHECK_RV( rv, "Query data start token");
594
595	/* Reset start position */
596	r = 0;
597	}
598
599	sd_card_read_start:
600
601	/* Read data */
602	while (r < response_size && i < n) {
603	in [i++] = response [r++];
604	}
605
606	/* Read more data? */
607	if (i < n) {
608	rv = sd_card_query( e, &in [i], n - i);
609	RTEMS_CHECK_RV( rv, "Read data");
610	i += rv;
611	}
612
613	/* Read CRC 16 and N_RC */
614	rv = sd_card_query( e, e->response, 3);
615	RTEMS_CHECK_RV( rv, "Read CRC 16");
616
617	crc16 = sd_card_compute_crc16 (in, n);
618	if ((e->response[0] != ((crc16 >> 8) & 0xff)) \|\|
619	(e->response[1] != (crc16 & 0xff))) {
620	RTEMS_SYSLOG_ERROR( "CRC check failed on read\n");
621	return -RTEMS_IO_ERROR;
622	}
623
624	return i;
625	}
626
627	static int sd_card_write( sd_card_driver_entry e, uint8_t start_token, uint8_t out, int n)
628	{
629	int rv = 0;
630	uint8_t crc16_bytes [2] = { 0, 0 };
631	uint16_t crc16;
632
633	/* Data output index */
634	int o = 0;
635
636	/* Wait until card is not busy */
637	rv = sd_card_wait( e);
638	RTEMS_CHECK_RV( rv, "Wait");
639
640	/* Write data start token */
641	rv = rtems_libi2c_write_bytes( e->bus, &start_token, 1);
642	RTEMS_CHECK_RV( rv, "Write data start token");
643
644	/* Write data */
645	o = rtems_libi2c_write_bytes( e->bus, out, n);
646	RTEMS_CHECK_RV( o, "Write data");
647
648	/* Write CRC 16 */
649	crc16 = sd_card_compute_crc16(out, n);
650	crc16_bytes[0] = (crc16>>8) & 0xff;
651	crc16_bytes[1] = (crc16) & 0xff;
652	rv = rtems_libi2c_write_bytes( e->bus, crc16_bytes, 2);
653	RTEMS_CHECK_RV( rv, "Write CRC 16");
654
655	/* Read data response */
656	rv = sd_card_query( e, e->response, 2);
657	RTEMS_CHECK_RV( rv, "Read data response");
658	if (SD_CARD_IS_DATA_REJECTED( e->response [0])) {
659	RTEMS_SYSLOG_ERROR( "Data rejected: 0x%02" PRIx8 "\n", e->response [0]);
660	return -RTEMS_IO_ERROR;
661	}
662
663	/* Card is now busy */
664	e->busy = true;
665
666	return o;
667	}
668
669	static inline rtems_status_code sd_card_start( sd_card_driver_entry *e)
670	{
671	rtems_status_code sc = RTEMS_SUCCESSFUL;
672	int rv = 0;
673
674	sc = rtems_libi2c_send_start( e->bus);
675	RTEMS_CHECK_SC( sc, "Send start");
676
677	rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode);
678	RTEMS_CHECK_RV_SC( rv, "Set transfer mode");
679
680	sc = rtems_libi2c_send_addr( e->bus, 1);
681	RTEMS_CHECK_SC( sc, "Send address");
682
683	return RTEMS_SUCCESSFUL;
684	}
685
686	static inline rtems_status_code sd_card_stop( sd_card_driver_entry *e)
687	{
688	rtems_status_code sc = RTEMS_SUCCESSFUL;
689
690	sc = rtems_libi2c_send_stop( e->bus);
691	RTEMS_CHECK_SC( sc, "Send stop");
692
693	return RTEMS_SUCCESSFUL;
694	}
695
696	static rtems_status_code sd_card_init( sd_card_driver_entry *e)
697	{
698	rtems_status_code sc = RTEMS_SUCCESSFUL;
699	int rv = 0;
700	uint8_t block [SD_CARD_BLOCK_SIZE_DEFAULT];
701	uint32_t transfer_speed = 0;
702	uint32_t read_block_size = 0;
703	uint32_t write_block_size = 0;
704	uint8_t csd_structure = 0;
705	uint64_t capacity = 0;
706	uint8_t crc7;
707
708	/* Assume first that we have a SD card and not a MMC card */
709	bool assume_sd = true;
710
711	/*
712	* Assume high capacity until proven wrong (applies to SD and not yet
713	* existing MMC).
714	*/
715	bool high_capacity = true;
716
717	bool do_cmd58 = true;
718	uint32_t cmd_arg = 0;
719	uint32_t if_cond_test = SD_CARD_FLAG_VHS_2_7_TO_3_3 \| SD_CARD_FLAG_CHECK_PATTERN;
720	uint32_t if_cond_reg = if_cond_test;
721
722	/* Start */
723	sc = sd_card_start( e);
724	RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Start");
725
726	/* Wait until card is not busy */
727	rv = sd_card_wait( e);
728	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Wait");
729
730	/* Send idle tokens for at least 74 clock cycles with active chip select */
731	memset( block, SD_CARD_IDLE_TOKEN, SD_CARD_BLOCK_SIZE_DEFAULT);
732	rv = rtems_libi2c_write_bytes( e->bus, block, SD_CARD_BLOCK_SIZE_DEFAULT);
733	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Active chip select delay");
734
735	/* Stop */
736	sc = sd_card_stop( e);
737	RTEMS_CHECK_SC( sc, "Stop");
738
739	/* Start with inactive chip select */
740	sc = rtems_libi2c_send_start( e->bus);
741	RTEMS_CHECK_SC( sc, "Send start");
742
743	/* Set transfer mode */
744	rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode);
745	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Set transfer mode");
746
747	/* Send idle tokens with inactive chip select */
748	rv = sd_card_query( e, e->response, SD_CARD_COMMAND_SIZE);
749	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Inactive chip select delay");
750
751	/* Activate chip select */
752	sc = rtems_libi2c_send_addr( e->bus, 1);
753	RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Send address");
754
755	/* Stop multiple block write */
756	sd_card_stop_multiple_block_write( e);
757
758	/* Get card status */
759	sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
760
761	/* Stop multiple block read */
762	sd_card_stop_multiple_block_read( e);
763
764	/* Switch to SPI mode */
765	rv = sd_card_send_command( e, SD_CARD_CMD_GO_IDLE_STATE, 0);
766	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_GO_IDLE_STATE");
767
768	/*
769	* Get interface condition, CMD8. This is new for SD 2.x and enables
770	* getting the High Capacity Support flag HCS and checks that the
771	* voltage is right. Some MMCs accept this command but will still fail
772	* on ACMD41. SD 1.x cards will fails this command and do not support
773	* HCS (> 2G capacity).
774	*/
775	rv = sd_card_send_register_command( e, SD_CARD_CMD_SEND_IF_COND, if_cond_reg, &if_cond_reg);
776
777	/*
778	* Regardless of whether CMD8 above passes or fails, send ACMD41. If
779	* card is MMC it will fail. But older SD < 2.0 (which fail CMD8) will
780	* always stay "idle" if cmd_arg is non-zero, so set to 0 above on
781	* fail.
782	*/
783	if (rv < 0) {
784	/* Failed CMD8, so SD 1.x or MMC */
785	cmd_arg = 0;
786	} else {
787	cmd_arg = SD_CARD_FLAG_HCS;
788	}
789
790	/* Enable CRC */
791	sd_card_send_command( e, SD_CARD_CMD_CRC_ON_OFF, 1);
792
793	/* Initialize card */
794	while (true) {
795	if (assume_sd) {
796	/* This command (CMD55) supported by SD and (most?) MMCs */
797	rv = sd_card_send_command( e, SD_CARD_CMD_APP_CMD, 0);
798	if (rv < 0) {
799	RTEMS_SYSLOG( "CMD55 failed. Assume MMC and try CMD1\n");
800	assume_sd = false;
801	continue;
802	}
803
804	/*
805	* This command (ACMD41) only supported by SD. Always
806	* fails if MMC.
807	*/
808	rv = sd_card_send_command( e, SD_CARD_ACMD_SD_SEND_OP_COND, cmd_arg);
809	if (rv < 0) {
810	/*
811	* This will fail for MMC. If fails, bad/no
812	* card or card is MMC, do CMD58 then CMD1.
813	*/
814	RTEMS_SYSLOG( "ACMD41 failed. Assume MMC and do CMD58 (once) then CMD1\n");
815	assume_sd = false;
816	cmd_arg = SD_CARD_FLAG_HCS;
817	do_cmd58 = true;
818	continue;
819	} else {
820	/*
821	* Passed ACMD41 so SD. It is now save to
822	* check if_cond_reg from CMD8. Reject the
823	* card in case of a indicated bad voltage.
824	*/
825	if (if_cond_reg != if_cond_test) {
826	RTEMS_CLEANUP_RV_SC( -1, sc, sd_card_driver_init_cleanup, "Bad voltage for SD");
827	}
828	}
829	} else {
830	/*
831	* Does not seem to be SD card. Do init for MMC.
832	* First send CMD58 once to enable check for HCS
833	* (similar to CMD8 of SD) with bits 30:29 set to 10b.
834	* This will work for MMC >= 4.2. Older cards (<= 4.1)
835	* may may not respond to CMD1 unless CMD58 is sent
836	* again with zero argument.
837	*/
838	if (do_cmd58) {
839	rv = sd_card_send_command( e, SD_CARD_CMD_READ_OCR, cmd_arg);
840	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC");
841
842	/* A one-shot call */
843	do_cmd58 = false;
844	}
845
846	/* Do CMD1 */
847	rv = sd_card_send_command( e, SD_CARD_CMD_SEND_OP_COND, 0);
848	if (rv < 0) {
849	if (cmd_arg != 0) {
850	/*
851	* Send CMD58 again with zero argument
852	* value. Proves card is not
853	* high_capacity.
854	*/
855	cmd_arg = 0;
856	do_cmd58 = true;
857	high_capacity = false;
858	continue;
859	}
860
861	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed to initialize MMC");
862	}
863	}
864
865	/*
866	* Not idle?
867	*
868	* This hangs forever if the card remains not idle and sends
869	* always a valid response.
870	*/
871	if (SD_CARD_IS_NOT_IDLE_RESPONSE( e->response [e->response_index])) {
872	break;
873	}
874
875	/* Invoke the scheduler */
876	rtems_task_wake_after( RTEMS_YIELD_PROCESSOR);
877	}
878
879	/* Now we know if we are SD or MMC */
880	if (assume_sd) {
881	if (cmd_arg == 0) {
882	/* SD is < 2.0 so never high capacity (<= 2G) */
883	high_capacity = 0;
884	} else {
885	uint32_t reg = 0;
886
887	/*
888	* SD is definitely 2.x. Now need to send CMD58 to get
889	* the OCR to see if the HCS bit is set (capacity > 2G)
890	* or if bit is off (capacity <= 2G, standard
891	* capacity).
892	*/
893	rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, 0, &reg);
894	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for SD 2.x");
895
896	/* Check HCS bit of OCR */
897	high_capacity = (reg & SD_CARD_FLAG_HCS) != 0;
898	}
899	} else {
900	/*
901	* Card is MMC. Unless already proven to be not HCS (< 4.2)
902	* must do CMD58 again to check the OCR bits 30:29.
903	*/
904	if (high_capacity) {
905	uint32_t reg = 0;
906
907	/*
908	* The argument should still be correct since was never
909	* set to 0
910	*/
911	rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, cmd_arg, &reg);
912	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC 4.2");
913
914	/* Check HCS bit of the OCR */
915	high_capacity = (reg & 0x600000) == SD_CARD_FLAG_HCS;
916	}
917	}
918
919	/* Card Identification */
920	if (e->verbose) {
921	rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CID, 0);
922	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CID");
923	rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CID_SIZE);
924	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CID");
925	RTEMS_SYSLOG( "* Card Identification *\n");
926	RTEMS_SYSLOG( "Manufacturer ID : %" PRIu8 "\n", SD_CARD_CID_GET_MID( block));
927	RTEMS_SYSLOG( "OEM/Application ID : %" PRIu16 "\n", SD_CARD_CID_GET_OID( block));
928	RTEMS_SYSLOG(
929	"Product name : %c%c%c%c%c%c\n",
930	SD_CARD_CID_GET_PNM( block, 0),
931	SD_CARD_CID_GET_PNM( block, 1),
932	SD_CARD_CID_GET_PNM( block, 2),
933	SD_CARD_CID_GET_PNM( block, 3),
934	SD_CARD_CID_GET_PNM( block, 4),
935	SD_CARD_CID_GET_PNM( block, 5)
936	);
937	RTEMS_SYSLOG( "Product revision : %" PRIu8 "\n", SD_CARD_CID_GET_PRV( block));
938	RTEMS_SYSLOG( "Product serial number : %" PRIu32 "\n", SD_CARD_CID_GET_PSN( block));
939	RTEMS_SYSLOG( "Manufacturing date : %" PRIu8 "\n", SD_CARD_CID_GET_MDT( block));
940	RTEMS_SYSLOG( "7-bit CRC checksum : %" PRIu8 "\n", SD_CARD_CID_GET_CRC7( block));
941	crc7 = sd_card_compute_crc7( block, 15);
942	if (crc7 != SD_CARD_CID_GET_CRC7( block))
943	RTEMS_SYSLOG( " Failed! (computed %02" PRIx8 ")\n", crc7);
944	}
945
946	/* Card Specific Data */
947
948	/* Read CSD */
949	rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CSD, 0);
950	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CSD");
951	rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CSD_SIZE);
952	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CSD");
953
954	crc7 = sd_card_compute_crc7( block, 15);
955	if (crc7 != SD_CARD_CID_GET_CRC7( block)) {
956	RTEMS_SYSLOG( "SD_CARD_CMD_SEND_CSD CRC failed\n");
957	sc = RTEMS_IO_ERROR;
958	goto sd_card_driver_init_cleanup;
959	}
960
961	/* CSD Structure */
962	csd_structure = SD_CARD_CSD_GET_CSD_STRUCTURE( block);
963
964	/* Transfer speed and access time */
965	transfer_speed = sd_card_transfer_speed( block);
966	e->transfer_mode.baudrate = transfer_speed;
967	e->n_ac_max = sd_card_max_access_time( block, transfer_speed);
968
969	/* Block sizes and capacity */
970	if (csd_structure == 0 \|\| !assume_sd) {
971	/* Treat MMC same as CSD Version 1.0 */
972
973	read_block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( block);
974	e->block_size_shift = SD_CARD_CSD_GET_WRITE_BLK_LEN( block);
975	write_block_size = 1U << e->block_size_shift;
976	if (read_block_size < write_block_size) {
977	RTEMS_SYSLOG_ERROR( "Read block size smaller than write block size\n");
978	return -RTEMS_IO_ERROR;
979	}
980	e->block_size = write_block_size;
981	e->block_number = sd_card_block_number( block);
982	capacity = sd_card_capacity( block);
983	} else if (csd_structure == 1) {
984	uint32_t c_size = SD_CARD_CSD_1_GET_C_SIZE( block);
985
986	/* Block size is fixed in CSD Version 2.0 */
987	e->block_size_shift = 9;
988	e->block_size = 512;
989
990	e->block_number = (c_size + 1) * 1024;
991	capacity = (c_size + 1) * 512 * 1024;
992	read_block_size = 512;
993	write_block_size = 512;
994
995	/* Timeout is fixed at 100ms in CSD Version 2.0 */
996	e->n_ac_max = transfer_speed / 80;
997	} else {
998	RTEMS_DO_CLEANUP_SC( RTEMS_IO_ERROR, sc, sd_card_driver_init_cleanup, "Unexpected CSD Structure number");
999	}
1000
1001	/* Print CSD information */
1002	if (e->verbose) {
1003	RTEMS_SYSLOG( "* Card Specific Data *\n");
1004	RTEMS_SYSLOG( "CSD structure : %" PRIu8 "\n", SD_CARD_CSD_GET_CSD_STRUCTURE( block));
1005	RTEMS_SYSLOG( "Spec version : %" PRIu8 "\n", SD_CARD_CSD_GET_SPEC_VERS( block));
1006	RTEMS_SYSLOG( "Access time [ns] : %" PRIu32 "\n", sd_card_access_time( block));
1007	RTEMS_SYSLOG( "Access time [N] : %" PRIu32 "\n", SD_CARD_CSD_GET_NSAC( block)*100);
1008	RTEMS_SYSLOG( "Max access time [N] : %" PRIu32 "\n", e->n_ac_max);
1009	RTEMS_SYSLOG( "Max read block size [B] : %" PRIu32 "\n", read_block_size);
1010	RTEMS_SYSLOG( "Max write block size [B] : %" PRIu32 "\n", write_block_size);
1011	RTEMS_SYSLOG( "Block size [B] : %" PRIu32 "\n", e->block_size);
1012	RTEMS_SYSLOG( "Block number : %" PRIu32 "\n", e->block_number);
1013	RTEMS_SYSLOG( "Capacity [B] : %" PRIu64 "\n", capacity);
1014	RTEMS_SYSLOG( "Max transfer speed [b/s] : %" PRIu32 "\n", transfer_speed);
1015	}
1016
1017	if (high_capacity) {
1018	/* For high capacity cards the address is in blocks */
1019	e->block_size_shift = 0;
1020	} else if (e->block_size_shift == 10) {
1021	/*
1022	* Low capacity 2GByte cards with reported block size of 1024
1023	* need to be set back to block size of 512 per 'Simplified
1024	* Physical Layer Specification Version 2.0' section 4.3.2.
1025	* Otherwise, CMD16 fails if set to 1024.
1026	*/
1027	e->block_size_shift = 9;
1028	e->block_size = 512;
1029	e->block_number *= 2;
1030	}
1031
1032	/* Set read block size */
1033	rv = sd_card_send_command( e, SD_CARD_CMD_SET_BLOCKLEN, e->block_size);
1034	RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SET_BLOCKLEN");
1035
1036	/* Stop */
1037	sc = sd_card_stop( e);
1038	RTEMS_CHECK_SC( sc, "Stop");
1039
1040	return RTEMS_SUCCESSFUL;
1041
1042	sd_card_driver_init_cleanup:
1043
1044	/* Stop */
1045	sd_card_stop( e);
1046
1047	return sc;
1048	}
1049	/** @} */
1050
1051	/**
1052	* @name Disk Driver Functions
1053	* @{
1054	*/
1055
1056	static int sd_card_disk_block_read( sd_card_driver_entry e, rtems_blkdev_request r)
1057	{
1058	rtems_status_code sc = RTEMS_SUCCESSFUL;
1059	int rv = 0;
1060	uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift;
1061	uint32_t i = 0;
1062
1063	#ifdef DEBUG
1064	/* Check request */
1065	if (r->bufs[0].block >= e->block_number) {
1066	RTEMS_SYSLOG_ERROR( "Start block number out of range");
1067	return -RTEMS_INTERNAL_ERROR;
1068	} else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) {
1069	RTEMS_SYSLOG_ERROR( "Block count out of range");
1070	return -RTEMS_INTERNAL_ERROR;
1071	}
1072	#endif /* DEBUG */
1073
1074	/* Start */
1075	sc = sd_card_start( e);
1076	RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_read_cleanup, "Start");
1077
1078	if (r->bufnum == 1) {
1079	#ifdef DEBUG
1080	/* Check buffer */
1081	if (r->bufs [0].length != e->block_size) {
1082	RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_cleanup, "Buffer and disk block size are not equal");
1083	}
1084	RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length);
1085	#endif /* DEBUG */
1086
1087	/* Single block read */
1088	rv = sd_card_send_command( e, SD_CARD_CMD_READ_SINGLE_BLOCK, start_address);
1089	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Send: SD_CARD_CMD_READ_SINGLE_BLOCK");
1090	rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, (uint8_t *) r->bufs [0].buffer, (int) e->block_size);
1091	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Read: SD_CARD_CMD_READ_SINGLE_BLOCK");
1092	} else {
1093	/* Start multiple block read */
1094	rv = sd_card_send_command( e, SD_CARD_CMD_READ_MULTIPLE_BLOCK, start_address);
1095	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Send: SD_CARD_CMD_READ_MULTIPLE_BLOCK");
1096
1097	/* Multiple block read */
1098	for (i = 0; i < r->bufnum; ++i) {
1099	#ifdef DEBUG
1100	/* Check buffer */
1101	if (r->bufs [i].length != e->block_size) {
1102	RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_stop_cleanup, "Buffer and disk block size are not equal");
1103	}
1104	RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length);
1105	#endif /* DEBUG */
1106
1107	rv = sd_card_read( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ, (uint8_t *) r->bufs [i].buffer, (int) e->block_size);
1108	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Read block");
1109	}
1110
1111	/* Stop multiple block read */
1112	rv = sd_card_stop_multiple_block_read( e);
1113	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Stop multiple block read");
1114	}
1115
1116	/* Stop */
1117	sc = sd_card_stop( e);
1118	RTEMS_CHECK_SC_RV( sc, "Stop");
1119
1120	/* Done */
1121	rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL);
1122
1123	return 0;
1124
1125	sd_card_disk_block_read_stop_cleanup:
1126
1127	/* Stop multiple block read */
1128	sd_card_stop_multiple_block_read( e);
1129
1130	sd_card_disk_block_read_cleanup:
1131
1132	/* Stop */
1133	sd_card_stop( e);
1134
1135	/* Done */
1136	rtems_blkdev_request_done( r, RTEMS_IO_ERROR);
1137
1138	return 0;
1139	}
1140
1141	static int sd_card_disk_block_write( sd_card_driver_entry e, rtems_blkdev_request r)
1142	{
1143	rtems_status_code sc = RTEMS_SUCCESSFUL;
1144	int rv = 0;
1145	uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift;
1146	uint32_t i = 0;
1147
1148	#ifdef DEBUG
1149	/* Check request */
1150	if (r->bufs[0].block >= e->block_number) {
1151	RTEMS_SYSLOG_ERROR( "Start block number out of range");
1152	return -RTEMS_INTERNAL_ERROR;
1153	} else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) {
1154	RTEMS_SYSLOG_ERROR( "Block count out of range");
1155	return -RTEMS_INTERNAL_ERROR;
1156	}
1157	#endif /* DEBUG */
1158
1159	/* Start */
1160	sc = sd_card_start( e);
1161	RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_write_cleanup, "Start");
1162
1163	if (r->bufnum == 1) {
1164	#ifdef DEBUG
1165	/* Check buffer */
1166	if (r->bufs [0].length != e->block_size) {
1167	RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_cleanup, "Buffer and disk block size are not equal");
1168	}
1169	RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length);
1170	#endif /* DEBUG */
1171
1172	/* Single block write */
1173	rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_BLOCK, start_address);
1174	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Send: SD_CARD_CMD_WRITE_BLOCK");
1175	rv = sd_card_write( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE, (uint8_t *) r->bufs [0].buffer, (int) e->block_size);
1176	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Write: SD_CARD_CMD_WRITE_BLOCK");
1177	} else {
1178	/* Start multiple block write */
1179	rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_MULTIPLE_BLOCK, start_address);
1180	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Send: SD_CARD_CMD_WRITE_MULTIPLE_BLOCK");
1181
1182	/* Multiple block write */
1183	for (i = 0; i < r->bufnum; ++i) {
1184	#ifdef DEBUG
1185	/* Check buffer */
1186	if (r->bufs [i].length != e->block_size) {
1187	RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_stop_cleanup, "Buffer and disk block size are not equal");
1188	}
1189	RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length);
1190	#endif /* DEBUG */
1191
1192	rv = sd_card_write( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE, (uint8_t *) r->bufs [i].buffer, (int) e->block_size);
1193	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Write block");
1194	}
1195
1196	/* Stop multiple block write */
1197	rv = sd_card_stop_multiple_block_write( e);
1198	RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Stop multiple block write");
1199	}
1200
1201	/* Get card status */
1202	rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
1203	RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS");
1204
1205	/* Stop */
1206	sc = sd_card_stop( e);
1207	RTEMS_CHECK_SC_RV( sc, "Stop");
1208
1209	/* Done */
1210	rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL);
1211
1212	return 0;
1213
1214	sd_card_disk_block_write_stop_cleanup:
1215
1216	/* Stop multiple block write */
1217	sd_card_stop_multiple_block_write( e);
1218
1219	sd_card_disk_block_write_cleanup:
1220
1221	/* Get card status */
1222	rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
1223	RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS");
1224
1225	/* Stop */
1226	sd_card_stop( e);
1227
1228	/* Done */
1229	rtems_blkdev_request_done( r, RTEMS_IO_ERROR);
1230
1231	return 0;
1232	}
1233
1234	static int sd_card_disk_ioctl( rtems_disk_device dd, uint32_t req, void arg)
1235	{
1236	RTEMS_DEBUG_PRINT( "dev = %u, req = %u, arg = 0x08%x\n", dev, req, arg);
1237	if (req == RTEMS_BLKIO_REQUEST) {
1238	rtems_device_minor_number minor = rtems_disk_get_minor_number( dd);
1239	sd_card_driver_entry *e = &sd_card_driver_table [minor];
1240	rtems_blkdev_request r = (rtems_blkdev_request ) arg;
1241	int (f)( sd_card_driver_entry , rtems_blkdev_request *);
1242	uint32_t retries = e->retries;
1243	int result;
1244
1245	switch (r->req) {
1246	case RTEMS_BLKDEV_REQ_READ:
1247	f = sd_card_disk_block_read;
1248	break;
1249	case RTEMS_BLKDEV_REQ_WRITE:
1250	f = sd_card_disk_block_write;
1251	break;
1252	default:
1253	errno = EINVAL;
1254	return -1;
1255	}
1256	do {
1257	result = f( e, r);
1258	} while (retries-- > 0 && result != 0);
1259	return result;
1260
1261	} else if (req == RTEMS_BLKIO_CAPABILITIES) {
1262	(uint32_t ) arg = RTEMS_BLKDEV_CAP_MULTISECTOR_CONT;
1263	return 0;
1264	} else {
1265	errno = EINVAL;
1266	return -1;
1267	}
1268	}
1269
1270	static rtems_status_code sd_card_disk_init( rtems_device_major_number major, rtems_device_minor_number minor, void *arg)
1271	{
1272	rtems_status_code sc = RTEMS_SUCCESSFUL;
1273
1274	/* Initialize disk IO */
1275	sc = rtems_disk_io_initialize();
1276	RTEMS_CHECK_SC( sc, "Initialize RTEMS disk IO");
1277
1278	for (minor = 0; minor < sd_card_driver_table_size; ++minor) {
1279	sd_card_driver_entry *e = &sd_card_driver_table [minor];
1280	dev_t dev = rtems_filesystem_make_dev_t( major, minor);
1281	uint32_t retries = e->retries;
1282
1283	/* Initialize SD Card */
1284	do {
1285	sc = sd_card_init( e);
1286	} while (retries-- > 0 && sc != RTEMS_SUCCESSFUL);
1287	RTEMS_CHECK_SC( sc, "Initialize SD Card");
1288
1289	/* Create disk device */
1290	sc = rtems_disk_create_phys( dev, e->block_size, e->block_number, sd_card_disk_ioctl, NULL, e->device_name);
1291	RTEMS_CHECK_SC( sc, "Create disk device");
1292	}
1293
1294	return RTEMS_SUCCESSFUL;
1295	}
1296
1297	/** @} */
1298
1299	static const rtems_driver_address_table sd_card_disk_ops = {
1300	.initialization_entry = sd_card_disk_init,
1301	.open_entry = rtems_blkdev_generic_open,
1302	.close_entry = rtems_blkdev_generic_close,
1303	.read_entry = rtems_blkdev_generic_read,
1304	.write_entry = rtems_blkdev_generic_write,
1305	.control_entry = rtems_blkdev_generic_ioctl
1306	};
1307
1308	rtems_status_code sd_card_register( void)
1309	{
1310	rtems_status_code sc = RTEMS_SUCCESSFUL;
1311	rtems_device_major_number major = 0;
1312
1313	sc = rtems_io_register_driver( 0, &sd_card_disk_ops, &major);
1314	RTEMS_CHECK_SC( sc, "Register disk SD Card driver");
1315
1316	return RTEMS_SUCCESSFUL;
1317	}

Note: See TracBrowser for help on using the repository browser.

Download in other formats: