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a52aa5b43feb8ebec1336025ffc59a7c8045b517
rtems/bsps/shared/dev/i2c/spi-sd-card.c
Joel Sherrill d6ebf4067e bsps/shared/*: Change license to BSD-2 
Updates #3053.
2022-06-15 12:35:18 -05:00

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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief SD Card LibI2C driver.
*/
/*
* Copyright (c) 2008, 2018 embedded brains GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <inttypes.h>
#include <rtems.h>
#include <rtems/libi2c.h>
#include <rtems/libio.h>
#include <rtems/blkdev.h>
#include <libchip/spi-sd-card.h>
#include <rtems/status-checks.h>
/**
* @name Integer to and from Byte-Stream Converter
* @{
*/
static inline uint16_t sd_card_get_uint16( const uint8_t *s)
{
return (uint16_t) ((s [0] << 8) | s [1]);
}
static inline uint32_t sd_card_get_uint32( const uint8_t *s)
{
return ((uint32_t) s [0] << 24) | ((uint32_t) s [1] << 16) | ((uint32_t) s [2] << 8) | (uint32_t) s [3];
}
static inline void sd_card_put_uint16( uint16_t v, uint8_t *s)
{
*s++ = (uint8_t) (v >> 8);
*s = (uint8_t) (v);
}
static inline void sd_card_put_uint32( uint32_t v, uint8_t *s)
{
*s++ = (uint8_t) (v >> 24);
*s++ = (uint8_t) (v >> 16);
*s++ = (uint8_t) (v >> 8);
*s = (uint8_t) (v);
}
/** @} */
#define SD_CARD_BUSY_TOKEN 0
#define SD_CARD_BLOCK_SIZE_DEFAULT 512
#define SD_CARD_COMMAND_RESPONSE_START 7
/**
* @name Commands
* @{
*/
#define SD_CARD_CMD_GO_IDLE_STATE 0
#define SD_CARD_CMD_SEND_OP_COND 1
#define SD_CARD_CMD_SEND_IF_COND 8
#define SD_CARD_CMD_SEND_CSD 9
#define SD_CARD_CMD_SEND_CID 10
#define SD_CARD_CMD_STOP_TRANSMISSION 12
#define SD_CARD_CMD_SEND_STATUS 13
#define SD_CARD_CMD_SET_BLOCKLEN 16
#define SD_CARD_CMD_READ_SINGLE_BLOCK 17
#define SD_CARD_CMD_READ_MULTIPLE_BLOCK 18
#define SD_CARD_CMD_SET_BLOCK_COUNT 23
#define SD_CARD_CMD_WRITE_BLOCK 24
#define SD_CARD_CMD_WRITE_MULTIPLE_BLOCK 25
#define SD_CARD_CMD_PROGRAM_CSD 27
#define SD_CARD_CMD_SET_WRITE_PROT 28
#define SD_CARD_CMD_CLR_WRITE_PROT 29
#define SD_CARD_CMD_SEND_WRITE_PROT 30
#define SD_CARD_CMD_TAG_SECTOR_START 32
#define SD_CARD_CMD_TAG_SECTOR_END 33
#define SD_CARD_CMD_UNTAG_SECTOR 34
#define SD_CARD_CMD_TAG_ERASE_GROUP_START 35
#define SD_CARD_CMD_TAG_ERASE_GROUP_END 36
#define SD_CARD_CMD_UNTAG_ERASE_GROUP 37
#define SD_CARD_CMD_ERASE 38
#define SD_CARD_CMD_LOCK_UNLOCK 42
#define SD_CARD_CMD_APP_CMD 55
#define SD_CARD_CMD_GEN_CND 56
#define SD_CARD_CMD_READ_OCR 58
#define SD_CARD_CMD_CRC_ON_OFF 59
/** @} */
/**
* @name Application Commands
* @{
*/
#define SD_CARD_ACMD_SD_SEND_OP_COND 41
/** @} */
/**
* @name Command Flags
* @{
*/
#define SD_CARD_FLAG_HCS 0x40000000U
#define SD_CARD_FLAG_VHS_2_7_TO_3_3 0x00000100U
#define SD_CARD_FLAG_CHECK_PATTERN 0x000000aaU
/** @} */
/**
* @name Command Fields
* @{
*/
#define SD_CARD_COMMAND_SET_COMMAND( c, cmd) (c) [1] = (uint8_t) (0x40 + ((cmd) & 0x3f))
#define SD_CARD_COMMAND_SET_ARGUMENT( c, arg) sd_card_put_uint32( (arg), &((c) [2]))
#define SD_CARD_COMMAND_SET_CRC7( c, crc7) ((c) [6] = ((crc7) << 1) | 1U)
#define SD_CARD_COMMAND_GET_CRC7( c) ((c) [6] >> 1)
/** @} */
/**
* @name Response Fields
* @{
*/
#define SD_CARD_IS_RESPONSE( r) (((r) & 0x80) == 0)
#define SD_CARD_IS_ERRORLESS_RESPONSE( r) (((r) & 0x7e) == 0)
#define SD_CARD_IS_NOT_IDLE_RESPONSE( r) (((r) & 0x81) == 0)
#define SD_CARD_IS_DATA_ERROR( r) (((r) & 0xe0) == 0)
#define SD_CARD_IS_DATA_REJECTED( r) (((r) & 0x1f) != 0x05)
/** @} */
/**
* @name Card Identification
* @{
*/
#define SD_CARD_CID_SIZE 16
#define SD_CARD_CID_GET_MID( cid) ((cid) [0])
#define SD_CARD_CID_GET_OID( cid) sd_card_get_uint16( cid + 1)
#define SD_CARD_CID_GET_PNM( cid, i) ((char) (cid) [3 + (i)])
#define SD_CARD_CID_GET_PRV( cid) ((cid) [9])
#define SD_CARD_CID_GET_PSN( cid) sd_card_get_uint32( cid + 10)
#define SD_CARD_CID_GET_MDT( cid) ((cid) [14])
#define SD_CARD_CID_GET_CRC7( cid) ((cid) [15] >> 1)
/** @} */
/**
* @name Card Specific Data
* @{
*/
#define SD_CARD_CSD_SIZE 16
#define SD_CARD_CSD_GET_CSD_STRUCTURE( csd) ((csd) [0] >> 6)
#define SD_CARD_CSD_GET_SPEC_VERS( csd) (((csd) [0] >> 2) & 0xf)
#define SD_CARD_CSD_GET_TAAC( csd) ((csd) [1])
#define SD_CARD_CSD_GET_NSAC( csd) ((uint32_t) (csd) [2])
#define SD_CARD_CSD_GET_TRAN_SPEED( csd) ((csd) [3])
#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))
#define SD_CARD_CSD_GET_C_SIZE_MULT( csd) ((((csd) [9] & 0x3) << 1) + (((csd) [10] >> 7) & 0x1))
#define SD_CARD_CSD_GET_READ_BLK_LEN( csd) ((uint32_t) (csd) [5] & 0xf)
#define SD_CARD_CSD_GET_WRITE_BLK_LEN( csd) ((((uint32_t) (csd) [12] & 0x3) << 2) + ((((uint32_t) (csd) [13]) >> 6) & 0x3))
#define SD_CARD_CSD_1_GET_C_SIZE( csd) ((((uint32_t) (csd) [7] & 0x3f) << 16) + (((uint32_t) (csd) [8]) << 8) + (uint32_t) (csd) [9])
/** @} */
#define SD_CARD_INVALIDATE_RESPONSE_INDEX( e) e->response_index = SD_CARD_COMMAND_SIZE
/**
* @name Data Start and Stop Tokens
* @{
*/
#define SD_CARD_START_BLOCK_SINGLE_BLOCK_READ 0xfe
#define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ 0xfe
#define SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE 0xfe
#define SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE 0xfc
#define SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE 0xfd
/** @} */
/**
* @name Card Specific Data Functions
* @{
*/
static inline uint32_t sd_card_block_number( const uint8_t *csd)
{
uint32_t size = SD_CARD_CSD_GET_C_SIZE( csd);
uint32_t mult = 1U << (SD_CARD_CSD_GET_C_SIZE_MULT( csd) + 2);
return (size + 1) * mult;
}
static inline uint32_t sd_card_capacity( const uint8_t *csd)
{
uint32_t block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( csd);
return sd_card_block_number( csd) * block_size;
}
static inline uint32_t sd_card_transfer_speed( const uint8_t *csd)
{
uint32_t s = SD_CARD_CSD_GET_TRAN_SPEED( csd);
uint32_t e = s & 0x7;
uint32_t m = s >> 3;
switch (e) {
case 0: s = 10000; break;
case 1: s = 100000; break;
case 2: s = 1000000; break;
case 3: s = 10000000; break;
default: s = 0; break;
}
switch (m) {
case 1: s *= 10; break;
case 2: s *= 12; break;
case 3: s *= 13; break;
case 4: s *= 15; break;
case 5: s *= 20; break;
case 6: s *= 25; break;
case 7: s *= 30; break;
case 8: s *= 35; break;
case 9: s *= 40; break;
case 10: s *= 45; break;
case 11: s *= 50; break;
case 12: s *= 55; break;
case 13: s *= 60; break;
case 14: s *= 70; break;
case 15: s *= 80; break;
default: s *= 0; break;
}
return s;
}
static inline uint32_t sd_card_access_time( const uint8_t *csd)
{
uint32_t ac = SD_CARD_CSD_GET_TAAC( csd);
uint32_t e = ac & 0x7;
uint32_t m = ac >> 3;
switch (e) {
case 0: ac = 1; break;
case 1: ac = 10; break;
case 2: ac = 100; break;
case 3: ac = 1000; break;
case 4: ac = 10000; break;
case 5: ac = 100000; break;
case 6: ac = 1000000; break;
case 7: ac = 10000000; break;
default: ac = 0; break;
}
switch (m) {
case 1: ac *= 10; break;
case 2: ac *= 12; break;
case 3: ac *= 13; break;
case 4: ac *= 15; break;
case 5: ac *= 20; break;
case 6: ac *= 25; break;
case 7: ac *= 30; break;
case 8: ac *= 35; break;
case 9: ac *= 40; break;
case 10: ac *= 45; break;
case 11: ac *= 50; break;
case 12: ac *= 55; break;
case 13: ac *= 60; break;
case 14: ac *= 70; break;
case 15: ac *= 80; break;
default: ac *= 0; break;
}
return ac / 10;
}
static inline uint32_t sd_card_max_access_time( const uint8_t *csd, uint32_t transfer_speed)
{
uint64_t ac = sd_card_access_time( csd);
uint32_t ac_100ms = transfer_speed / 80;
uint32_t n = SD_CARD_CSD_GET_NSAC( csd) * 100;
/* ac is in ns, transfer_speed in bps, max_access_time in bytes.
max_access_time is 100 times typical access time (taac+nsac) */
ac = ac * transfer_speed / 80000000;
ac = ac + 100*n;
if ((uint32_t)ac > ac_100ms)
return ac_100ms;
else
return (uint32_t)ac;
}
/** @} */
/**
* @name CRC functions
*
* Based on http://en.wikipedia.org/wiki/Computation_of_CRC
*
* @{
*/
static uint8_t sd_card_compute_crc7 (uint8_t *data, size_t len)
{
uint8_t e, f, crc;
size_t i;
crc = 0;
for (i = 0; i < len; i++) {
e = crc ^ data[i];
f = e ^ (e >> 4) ^ (e >> 7);
crc = (f << 1) ^ (f << 4);
}
return crc >> 1;
}
static uint16_t sd_card_compute_crc16 (uint8_t *data, size_t len)
{
uint8_t s, t;
uint16_t crc;
size_t i;
crc = 0;
for (i = 0; i < len; i++) {
s = data[i] ^ (crc >> 8);
t = s ^ (s >> 4);
crc = (crc << 8) ^ t ^ (t << 5) ^ (t << 12);
}
return crc;
}
/** @} */
/**
* @name Communication Functions
* @{
*/
static inline int sd_card_query( sd_card_driver_entry *e, uint8_t *in, int n)
{
return rtems_libi2c_read_bytes( e->bus, in, n);
}
static int sd_card_wait( sd_card_driver_entry *e)
{
int rv = 0;
int r = 0;
int n = 2;
/* For writes, the timeout is 2.5 times that of reads; since we
don't know if it is a write or read, assume write.
FIXME should actually look at R2W_FACTOR for non-HC cards. */
int retries = e->n_ac_max * 25 / 10;
/* n_ac_max/100 is supposed to be the average waiting time. To
approximate this, we start with waiting n_ac_max/150 and
gradually increase the waiting time. */
int wait_time_bytes = (retries + 149) / 150;
while (e->busy) {
/* Query busy tokens */
rv = sd_card_query( e, e->response, n);
RTEMS_CHECK_RV( rv, "Busy");
/* Search for non busy tokens */
for (r = 0; r < n; ++r) {
if (e->response [r] != SD_CARD_BUSY_TOKEN) {
e->busy = false;
return 0;
}
}
retries -= n;
if (retries <= 0) {
return -RTEMS_TIMEOUT;
}
if (e->schedule_if_busy) {
uint64_t wait_time_us = wait_time_bytes;
wait_time_us *= 8000000;
wait_time_us /= e->transfer_mode.baudrate;
rtems_task_wake_after( RTEMS_MICROSECONDS_TO_TICKS(wait_time_us));
retries -= wait_time_bytes;
wait_time_bytes = wait_time_bytes * 15 / 10;
} else {
n = SD_CARD_COMMAND_SIZE;
}
}
return 0;
}
static int sd_card_send_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument)
{
int rv = 0;
rtems_libi2c_read_write_t rw = {
.rd_buf = e->response,
.wr_buf = e->command,
.byte_cnt = SD_CARD_COMMAND_SIZE
};
int r = 0;
uint8_t crc7;
SD_CARD_INVALIDATE_RESPONSE_INDEX( e);
/* Wait until card is not busy */
rv = sd_card_wait( e);
RTEMS_CHECK_RV( rv, "Wait");
/* Write command and read response */
SD_CARD_COMMAND_SET_COMMAND( e->command, command);
SD_CARD_COMMAND_SET_ARGUMENT( e->command, argument);
crc7 = sd_card_compute_crc7( e->command + 1, 5);
SD_CARD_COMMAND_SET_CRC7( e->command, crc7);
rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_READ_WRITE, &rw);
RTEMS_CHECK_RV( rv, "Write command and read response");
/* Check respose */
for (r = SD_CARD_COMMAND_RESPONSE_START; r < SD_CARD_COMMAND_SIZE; ++r) {
RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, e->response [r]);
e->response_index = r;
if (SD_CARD_IS_RESPONSE( e->response [r])) {
if (SD_CARD_IS_ERRORLESS_RESPONSE( e->response [r])) {
return 0;
} else {
RTEMS_SYSLOG_ERROR( "Command error [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]);
goto sd_card_send_command_error;
}
} else if (e->response [r] != SD_CARD_IDLE_TOKEN) {
RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, e->response [r]);
goto sd_card_send_command_error;
}
}
RTEMS_SYSLOG_ERROR( "Timeout\n");
sd_card_send_command_error:
RTEMS_SYSLOG_ERROR( "Response:");
for (r = 0; r < SD_CARD_COMMAND_SIZE; ++r) {
if (e->response_index == r) {
RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":[%02" PRIx8 "]", e->command [r], e->response [r]);
} else {
RTEMS_SYSLOG_PRINT( " %02" PRIx8 ":%02" PRIx8 "", e->command [r], e->response [r]);
}
}
RTEMS_SYSLOG_PRINT( "\n");
return -RTEMS_IO_ERROR;
}
static int sd_card_send_register_command( sd_card_driver_entry *e, uint32_t command, uint32_t argument, uint32_t *reg)
{
int rv = 0;
uint8_t crc7;
rv = sd_card_send_command( e, command, argument);
RTEMS_CHECK_RV( rv, "Send command");
if (e->response_index + 5 > SD_CARD_COMMAND_SIZE) {
/*
* TODO: If this happens in the wild we need to implement a
* more sophisticated response query.
*/
RTEMS_SYSLOG_ERROR( "Unexpected response position\n");
return -RTEMS_IO_ERROR;
}
crc7 = sd_card_compute_crc7( e->response + e->response_index, 5);
if (crc7 != SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) &&
SD_CARD_COMMAND_GET_CRC7( e->response + e->response_index) != 0x7f) {
RTEMS_SYSLOG_ERROR( "CRC check failed on register command\n");
return -RTEMS_IO_ERROR;
}
*reg = sd_card_get_uint32( e->response + e->response_index + 1);
return 0;
}
static int sd_card_stop_multiple_block_read( sd_card_driver_entry *e)
{
int rv = 0;
uint8_t crc7;
SD_CARD_COMMAND_SET_COMMAND( e->command, SD_CARD_CMD_STOP_TRANSMISSION);
SD_CARD_COMMAND_SET_ARGUMENT( e->command, 0);
/*crc7 = sd_card_compute_crc7( e->command + 1, 5);*/
crc7 = 0x30; /* Help compiler - command and argument are constants */
SD_CARD_COMMAND_SET_CRC7( e->command, crc7);
rv = rtems_libi2c_write_bytes( e->bus, e->command, SD_CARD_COMMAND_SIZE);
RTEMS_CHECK_RV( rv, "Write stop transfer token");
return 0;
}
static int sd_card_stop_multiple_block_write( sd_card_driver_entry *e)
{
int rv = 0;
uint8_t stop_transfer [3] = { SD_CARD_IDLE_TOKEN, SD_CARD_STOP_TRANSFER_MULTIPLE_BLOCK_WRITE, SD_CARD_IDLE_TOKEN };
/* Wait until card is not busy */
rv = sd_card_wait( e);
RTEMS_CHECK_RV( rv, "Wait");
/* Send stop token */
rv = rtems_libi2c_write_bytes( e->bus, stop_transfer, 3);
RTEMS_CHECK_RV( rv, "Write stop transfer token");
/* Card is now busy */
e->busy = true;
return 0;
}
static int sd_card_read( sd_card_driver_entry *e, uint8_t start_token, uint8_t *in, int n)
{
int rv = 0;
/* Discard command response */
int r = e->response_index + 1;
/* Standard response size */
int response_size = SD_CARD_COMMAND_SIZE;
/* Where the response is stored */
uint8_t *response = e->response;
/* Data input index */
int i = 0;
/* CRC check of data */
uint16_t crc16;
/* Maximum number of tokens to read. */
int retries = e->n_ac_max;
SD_CARD_INVALIDATE_RESPONSE_INDEX( e);
while (true) {
RTEMS_DEBUG_PRINT( "Search from %u to %u\n", r, response_size - 1);
/* Search the data start token in in current response buffer */
retries -= (response_size - r);
while (r < response_size) {
RTEMS_DEBUG_PRINT( "Token [%02u]: 0x%02x\n", r, response [r]);
if (response [r] == start_token) {
/* Discard data start token */
++r;
goto sd_card_read_start;
} else if (SD_CARD_IS_DATA_ERROR( response [r])) {
RTEMS_SYSLOG_ERROR( "Data error token [%02i]: 0x%02" PRIx8 "\n", r, response [r]);
return -RTEMS_IO_ERROR;
} else if (response [r] != SD_CARD_IDLE_TOKEN) {
RTEMS_SYSLOG_ERROR( "Unexpected token [%02i]: 0x%02" PRIx8 "\n", r, response [r]);
return -RTEMS_IO_ERROR;
}
++r;
}
if (retries <= 0) {
RTEMS_SYSLOG_ERROR( "Timeout\n");
return -RTEMS_IO_ERROR;
}
if (e->schedule_if_busy)
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR);
/* Query more. We typically have to wait between 10 and 100
bytes. To reduce overhead, read the response in chunks of
50 bytes - this doesn't introduce too much copy overhead
but does allow SPI DMA transfers to work efficiently. */
response = in;
response_size = 50;
if (response_size > n)
response_size = n;
rv = sd_card_query( e, response, response_size);
RTEMS_CHECK_RV( rv, "Query data start token");
/* Reset start position */
r = 0;
}
sd_card_read_start:
/* Read data */
while (r < response_size && i < n) {
in [i++] = response [r++];
}
/* Read more data? */
if (i < n) {
rv = sd_card_query( e, &in [i], n - i);
RTEMS_CHECK_RV( rv, "Read data");
i += rv;
}
/* Read CRC 16 and N_RC */
rv = sd_card_query( e, e->response, 3);
RTEMS_CHECK_RV( rv, "Read CRC 16");
crc16 = sd_card_compute_crc16 (in, n);
if ((e->response[0] != ((crc16 >> 8) & 0xff)) ||
(e->response[1] != (crc16 & 0xff))) {
RTEMS_SYSLOG_ERROR( "CRC check failed on read\n");
return -RTEMS_IO_ERROR;
}
return i;
}
static int sd_card_write( sd_card_driver_entry *e, uint8_t start_token, uint8_t *out, int n)
{
int rv = 0;
uint8_t crc16_bytes [2] = { 0, 0 };
uint16_t crc16;
/* Data output index */
int o = 0;
/* Wait until card is not busy */
rv = sd_card_wait( e);
RTEMS_CHECK_RV( rv, "Wait");
/* Write data start token */
rv = rtems_libi2c_write_bytes( e->bus, &start_token, 1);
RTEMS_CHECK_RV( rv, "Write data start token");
/* Write data */
o = rtems_libi2c_write_bytes( e->bus, out, n);
RTEMS_CHECK_RV( o, "Write data");
/* Write CRC 16 */
crc16 = sd_card_compute_crc16(out, n);
crc16_bytes[0] = (crc16>>8) & 0xff;
crc16_bytes[1] = (crc16) & 0xff;
rv = rtems_libi2c_write_bytes( e->bus, crc16_bytes, 2);
RTEMS_CHECK_RV( rv, "Write CRC 16");
/* Read data response */
rv = sd_card_query( e, e->response, 2);
RTEMS_CHECK_RV( rv, "Read data response");
if (SD_CARD_IS_DATA_REJECTED( e->response [0])) {
RTEMS_SYSLOG_ERROR( "Data rejected: 0x%02" PRIx8 "\n", e->response [0]);
return -RTEMS_IO_ERROR;
}
/* Card is now busy */
e->busy = true;
return o;
}
static inline rtems_status_code sd_card_start( sd_card_driver_entry *e)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
int rv = 0;
sc = rtems_libi2c_send_start( e->bus);
RTEMS_CHECK_SC( sc, "Send start");
rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode);
RTEMS_CHECK_RV_SC( rv, "Set transfer mode");
sc = rtems_libi2c_send_addr( e->bus, 1);
RTEMS_CHECK_SC( sc, "Send address");
return RTEMS_SUCCESSFUL;
}
static inline rtems_status_code sd_card_stop( sd_card_driver_entry *e)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
sc = rtems_libi2c_send_stop( e->bus);
RTEMS_CHECK_SC( sc, "Send stop");
return RTEMS_SUCCESSFUL;
}
static rtems_status_code sd_card_init( sd_card_driver_entry *e)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
int rv = 0;
uint8_t block [SD_CARD_BLOCK_SIZE_DEFAULT];
uint32_t transfer_speed = 0;
uint32_t read_block_size = 0;
uint32_t write_block_size = 0;
uint8_t csd_structure = 0;
uint64_t capacity = 0;
uint8_t crc7;
/* Assume first that we have a SD card and not a MMC card */
bool assume_sd = true;
/*
* Assume high capacity until proven wrong (applies to SD and not yet
* existing MMC).
*/
bool high_capacity = true;
bool do_cmd58 = true;
uint32_t cmd_arg = 0;
uint32_t if_cond_test = SD_CARD_FLAG_VHS_2_7_TO_3_3 | SD_CARD_FLAG_CHECK_PATTERN;
uint32_t if_cond_reg = if_cond_test;
/* Start */
sc = sd_card_start( e);
RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Start");
/* Wait until card is not busy */
rv = sd_card_wait( e);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Wait");
/* Send idle tokens for at least 74 clock cycles with active chip select */
memset( block, SD_CARD_IDLE_TOKEN, SD_CARD_BLOCK_SIZE_DEFAULT);
rv = rtems_libi2c_write_bytes( e->bus, block, SD_CARD_BLOCK_SIZE_DEFAULT);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Active chip select delay");
/* Stop */
sc = sd_card_stop( e);
RTEMS_CHECK_SC( sc, "Stop");
/* Start with inactive chip select */
sc = rtems_libi2c_send_start( e->bus);
RTEMS_CHECK_SC( sc, "Send start");
/* Set transfer mode */
rv = rtems_libi2c_ioctl( e->bus, RTEMS_LIBI2C_IOCTL_SET_TFRMODE, &e->transfer_mode);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Set transfer mode");
/* Send idle tokens with inactive chip select */
rv = sd_card_query( e, e->response, SD_CARD_COMMAND_SIZE);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Inactive chip select delay");
/* Activate chip select */
sc = rtems_libi2c_send_addr( e->bus, 1);
RTEMS_CLEANUP_SC( sc, sd_card_driver_init_cleanup, "Send address");
/* Stop multiple block write */
sd_card_stop_multiple_block_write( e);
/* Get card status */
sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
/* Stop multiple block read */
sd_card_stop_multiple_block_read( e);
/* Switch to SPI mode */
rv = sd_card_send_command( e, SD_CARD_CMD_GO_IDLE_STATE, 0);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_GO_IDLE_STATE");
/*
* Get interface condition, CMD8. This is new for SD 2.x and enables
* getting the High Capacity Support flag HCS and checks that the
* voltage is right. Some MMCs accept this command but will still fail
* on ACMD41. SD 1.x cards will fails this command and do not support
* HCS (> 2G capacity).
*/
rv = sd_card_send_register_command( e, SD_CARD_CMD_SEND_IF_COND, if_cond_reg, &if_cond_reg);
/*
* Regardless of whether CMD8 above passes or fails, send ACMD41. If
* card is MMC it will fail. But older SD < 2.0 (which fail CMD8) will
* always stay "idle" if cmd_arg is non-zero, so set to 0 above on
* fail.
*/
if (rv < 0) {
/* Failed CMD8, so SD 1.x or MMC */
cmd_arg = 0;
} else {
cmd_arg = SD_CARD_FLAG_HCS;
}
/* Enable CRC */
sd_card_send_command( e, SD_CARD_CMD_CRC_ON_OFF, 1);
/* Initialize card */
while (true) {
if (assume_sd) {
/* This command (CMD55) supported by SD and (most?) MMCs */
rv = sd_card_send_command( e, SD_CARD_CMD_APP_CMD, 0);
if (rv < 0) {
RTEMS_SYSLOG( "CMD55 failed. Assume MMC and try CMD1\n");
assume_sd = false;
continue;
}
/*
* This command (ACMD41) only supported by SD. Always
* fails if MMC.
*/
rv = sd_card_send_command( e, SD_CARD_ACMD_SD_SEND_OP_COND, cmd_arg);
if (rv < 0) {
/*
* This *will* fail for MMC. If fails, bad/no
* card or card is MMC, do CMD58 then CMD1.
*/
RTEMS_SYSLOG( "ACMD41 failed. Assume MMC and do CMD58 (once) then CMD1\n");
assume_sd = false;
cmd_arg = SD_CARD_FLAG_HCS;
do_cmd58 = true;
continue;
} else {
/*
* Passed ACMD41 so SD. It is now save to
* check if_cond_reg from CMD8. Reject the
* card in case of a indicated bad voltage.
*/
if (if_cond_reg != if_cond_test) {
RTEMS_CLEANUP_RV_SC( -1, sc, sd_card_driver_init_cleanup, "Bad voltage for SD");
}
}
} else {
/*
* Does not seem to be SD card. Do init for MMC.
* First send CMD58 once to enable check for HCS
* (similar to CMD8 of SD) with bits 30:29 set to 10b.
* This will work for MMC >= 4.2. Older cards (<= 4.1)
* may may not respond to CMD1 unless CMD58 is sent
* again with zero argument.
*/
if (do_cmd58) {
rv = sd_card_send_command( e, SD_CARD_CMD_READ_OCR, cmd_arg);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC");
/* A one-shot call */
do_cmd58 = false;
}
/* Do CMD1 */
rv = sd_card_send_command( e, SD_CARD_CMD_SEND_OP_COND, 0);
if (rv < 0) {
if (cmd_arg != 0) {
/*
* Send CMD58 again with zero argument
* value. Proves card is not
* high_capacity.
*/
cmd_arg = 0;
do_cmd58 = true;
high_capacity = false;
continue;
}
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed to initialize MMC");
}
}
/*
* Not idle?
*
* This hangs forever if the card remains not idle and sends
* always a valid response.
*/
if (SD_CARD_IS_NOT_IDLE_RESPONSE( e->response [e->response_index])) {
break;
}
/* Invoke the scheduler */
rtems_task_wake_after( RTEMS_YIELD_PROCESSOR);
}
/* Now we know if we are SD or MMC */
if (assume_sd) {
if (cmd_arg == 0) {
/* SD is < 2.0 so never high capacity (<= 2G) */
high_capacity = 0;
} else {
uint32_t reg = 0;
/*
* SD is definitely 2.x. Now need to send CMD58 to get
* the OCR to see if the HCS bit is set (capacity > 2G)
* or if bit is off (capacity <= 2G, standard
* capacity).
*/
rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, 0, &reg);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for SD 2.x");
/* Check HCS bit of OCR */
high_capacity = (reg & SD_CARD_FLAG_HCS) != 0;
}
} else {
/*
* Card is MMC. Unless already proven to be not HCS (< 4.2)
* must do CMD58 again to check the OCR bits 30:29.
*/
if (high_capacity) {
uint32_t reg = 0;
/*
* The argument should still be correct since was never
* set to 0
*/
rv = sd_card_send_register_command( e, SD_CARD_CMD_READ_OCR, cmd_arg, &reg);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Failed CMD58 for MMC 4.2");
/* Check HCS bit of the OCR */
high_capacity = (reg & SD_CARD_FLAG_HCS) != 0;
}
}
/* Card Identification */
if (e->verbose) {
rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CID, 0);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CID");
rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CID_SIZE);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CID");
RTEMS_SYSLOG( "*** Card Identification ***\n");
RTEMS_SYSLOG( "Manufacturer ID : %" PRIu8 "\n", SD_CARD_CID_GET_MID( block));
RTEMS_SYSLOG( "OEM/Application ID : %" PRIu16 "\n", SD_CARD_CID_GET_OID( block));
RTEMS_SYSLOG(
"Product name : %c%c%c%c%c%c\n",
SD_CARD_CID_GET_PNM( block, 0),
SD_CARD_CID_GET_PNM( block, 1),
SD_CARD_CID_GET_PNM( block, 2),
SD_CARD_CID_GET_PNM( block, 3),
SD_CARD_CID_GET_PNM( block, 4),
SD_CARD_CID_GET_PNM( block, 5)
);
RTEMS_SYSLOG( "Product revision : %" PRIu8 "\n", SD_CARD_CID_GET_PRV( block));
RTEMS_SYSLOG( "Product serial number : %" PRIu32 "\n", SD_CARD_CID_GET_PSN( block));
RTEMS_SYSLOG( "Manufacturing date : %" PRIu8 "\n", SD_CARD_CID_GET_MDT( block));
RTEMS_SYSLOG( "7-bit CRC checksum : %" PRIu8 "\n", SD_CARD_CID_GET_CRC7( block));
crc7 = sd_card_compute_crc7( block, 15);
if (crc7 != SD_CARD_CID_GET_CRC7( block))
RTEMS_SYSLOG( " Failed! (computed %02" PRIx8 ")\n", crc7);
}
/* Card Specific Data */
/* Read CSD */
rv = sd_card_send_command( e, SD_CARD_CMD_SEND_CSD, 0);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SEND_CSD");
rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, block, SD_CARD_CSD_SIZE);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Read: SD_CARD_CMD_SEND_CSD");
crc7 = sd_card_compute_crc7( block, 15);
if (crc7 != SD_CARD_CID_GET_CRC7( block)) {
RTEMS_SYSLOG( "SD_CARD_CMD_SEND_CSD CRC failed\n");
sc = RTEMS_IO_ERROR;
goto sd_card_driver_init_cleanup;
}
/* CSD Structure */
csd_structure = SD_CARD_CSD_GET_CSD_STRUCTURE( block);
/* Transfer speed and access time */
transfer_speed = sd_card_transfer_speed( block);
e->transfer_mode.baudrate = transfer_speed;
e->n_ac_max = sd_card_max_access_time( block, transfer_speed);
/* Block sizes and capacity */
if (csd_structure == 0 || !assume_sd) {
/* Treat MMC same as CSD Version 1.0 */
read_block_size = 1U << SD_CARD_CSD_GET_READ_BLK_LEN( block);
e->block_size_shift = SD_CARD_CSD_GET_WRITE_BLK_LEN( block);
write_block_size = 1U << e->block_size_shift;
if (read_block_size < write_block_size) {
RTEMS_SYSLOG_ERROR( "Read block size smaller than write block size\n");
return -RTEMS_IO_ERROR;
}
e->block_size = write_block_size;
e->block_number = sd_card_block_number( block);
capacity = sd_card_capacity( block);
} else if (csd_structure == 1) {
uint32_t c_size = SD_CARD_CSD_1_GET_C_SIZE( block);
/* Block size is fixed in CSD Version 2.0 */
e->block_size_shift = 9;
e->block_size = 512;
e->block_number = (c_size + 1) * 1024;
capacity = (c_size + 1) * 512 * 1024;
read_block_size = 512;
write_block_size = 512;
/* Timeout is fixed at 100ms in CSD Version 2.0 */
e->n_ac_max = transfer_speed / 80;
} else {
RTEMS_DO_CLEANUP_SC( RTEMS_IO_ERROR, sc, sd_card_driver_init_cleanup, "Unexpected CSD Structure number");
}
/* Print CSD information */
if (e->verbose) {
RTEMS_SYSLOG( "*** Card Specific Data ***\n");
RTEMS_SYSLOG( "CSD structure : %" PRIu8 "\n", SD_CARD_CSD_GET_CSD_STRUCTURE( block));
RTEMS_SYSLOG( "Spec version : %" PRIu8 "\n", SD_CARD_CSD_GET_SPEC_VERS( block));
RTEMS_SYSLOG( "Access time [ns] : %" PRIu32 "\n", sd_card_access_time( block));
RTEMS_SYSLOG( "Access time [N] : %" PRIu32 "\n", SD_CARD_CSD_GET_NSAC( block)*100);
RTEMS_SYSLOG( "Max access time [N] : %" PRIu32 "\n", e->n_ac_max);
RTEMS_SYSLOG( "Max read block size [B] : %" PRIu32 "\n", read_block_size);
RTEMS_SYSLOG( "Max write block size [B] : %" PRIu32 "\n", write_block_size);
RTEMS_SYSLOG( "Block size [B] : %" PRIu32 "\n", e->block_size);
RTEMS_SYSLOG( "Block number : %" PRIu32 "\n", e->block_number);
RTEMS_SYSLOG( "Capacity [B] : %" PRIu64 "\n", capacity);
RTEMS_SYSLOG( "Max transfer speed [b/s] : %" PRIu32 "\n", transfer_speed);
}
if (high_capacity) {
/* For high capacity cards the address is in blocks */
e->block_size_shift = 0;
} else if (e->block_size_shift == 10) {
/*
* Low capacity 2GByte cards with reported block size of 1024
* need to be set back to block size of 512 per 'Simplified
* Physical Layer Specification Version 2.0' section 4.3.2.
* Otherwise, CMD16 fails if set to 1024.
*/
e->block_size_shift = 9;
e->block_size = 512;
e->block_number *= 2;
}
/* Set read block size */
rv = sd_card_send_command( e, SD_CARD_CMD_SET_BLOCKLEN, e->block_size);
RTEMS_CLEANUP_RV_SC( rv, sc, sd_card_driver_init_cleanup, "Send: SD_CARD_CMD_SET_BLOCKLEN");
/* Stop */
sc = sd_card_stop( e);
RTEMS_CHECK_SC( sc, "Stop");
return RTEMS_SUCCESSFUL;
sd_card_driver_init_cleanup:
/* Stop */
sd_card_stop( e);
return sc;
}
/** @} */
/**
* @name Disk Driver Functions
* @{
*/
static int sd_card_disk_block_read( sd_card_driver_entry *e, rtems_blkdev_request *r)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
int rv = 0;
uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift;
uint32_t i = 0;
#ifdef DEBUG
/* Check request */
if (r->bufs[0].block >= e->block_number) {
RTEMS_SYSLOG_ERROR( "Start block number out of range");
return -RTEMS_INTERNAL_ERROR;
} else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) {
RTEMS_SYSLOG_ERROR( "Block count out of range");
return -RTEMS_INTERNAL_ERROR;
}
#endif /* DEBUG */
/* Start */
sc = sd_card_start( e);
RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_read_cleanup, "Start");
if (r->bufnum == 1) {
#ifdef DEBUG
/* Check buffer */
if (r->bufs [0].length != e->block_size) {
RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_cleanup, "Buffer and disk block size are not equal");
}
RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length);
#endif /* DEBUG */
/* Single block read */
rv = sd_card_send_command( e, SD_CARD_CMD_READ_SINGLE_BLOCK, start_address);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Send: SD_CARD_CMD_READ_SINGLE_BLOCK");
rv = sd_card_read( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_READ, (uint8_t *) r->bufs [0].buffer, (int) e->block_size);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Read: SD_CARD_CMD_READ_SINGLE_BLOCK");
} else {
/* Start multiple block read */
rv = sd_card_send_command( e, SD_CARD_CMD_READ_MULTIPLE_BLOCK, start_address);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Send: SD_CARD_CMD_READ_MULTIPLE_BLOCK");
/* Multiple block read */
for (i = 0; i < r->bufnum; ++i) {
#ifdef DEBUG
/* Check buffer */
if (r->bufs [i].length != e->block_size) {
RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_read_stop_cleanup, "Buffer and disk block size are not equal");
}
RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length);
#endif /* DEBUG */
rv = sd_card_read( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_READ, (uint8_t *) r->bufs [i].buffer, (int) e->block_size);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_stop_cleanup, "Read block");
}
/* Stop multiple block read */
rv = sd_card_stop_multiple_block_read( e);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_read_cleanup, "Stop multiple block read");
}
/* Stop */
sc = sd_card_stop( e);
RTEMS_CHECK_SC_RV( sc, "Stop");
/* Done */
rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL);
return 0;
sd_card_disk_block_read_stop_cleanup:
/* Stop multiple block read */
sd_card_stop_multiple_block_read( e);
sd_card_disk_block_read_cleanup:
/* Stop */
sd_card_stop( e);
/* Done */
rtems_blkdev_request_done( r, RTEMS_IO_ERROR);
return 0;
}
static int sd_card_disk_block_write( sd_card_driver_entry *e, rtems_blkdev_request *r)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
int rv = 0;
uint32_t start_address = RTEMS_BLKDEV_START_BLOCK (r) << e->block_size_shift;
uint32_t i = 0;
#ifdef DEBUG
/* Check request */
if (r->bufs[0].block >= e->block_number) {
RTEMS_SYSLOG_ERROR( "Start block number out of range");
return -RTEMS_INTERNAL_ERROR;
} else if (r->bufnum > e->block_number - RTEMS_BLKDEV_START_BLOCK (r)) {
RTEMS_SYSLOG_ERROR( "Block count out of range");
return -RTEMS_INTERNAL_ERROR;
}
#endif /* DEBUG */
/* Start */
sc = sd_card_start( e);
RTEMS_CLEANUP_SC_RV( sc, rv, sd_card_disk_block_write_cleanup, "Start");
if (r->bufnum == 1) {
#ifdef DEBUG
/* Check buffer */
if (r->bufs [0].length != e->block_size) {
RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_cleanup, "Buffer and disk block size are not equal");
}
RTEMS_DEBUG_PRINT( "[01:01]: buffer = 0x%08x, size = %u\n", r->bufs [0].buffer, r->bufs [0].length);
#endif /* DEBUG */
/* Single block write */
rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_BLOCK, start_address);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Send: SD_CARD_CMD_WRITE_BLOCK");
rv = sd_card_write( e, SD_CARD_START_BLOCK_SINGLE_BLOCK_WRITE, (uint8_t *) r->bufs [0].buffer, (int) e->block_size);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Write: SD_CARD_CMD_WRITE_BLOCK");
} else {
/* Start multiple block write */
rv = sd_card_send_command( e, SD_CARD_CMD_WRITE_MULTIPLE_BLOCK, start_address);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Send: SD_CARD_CMD_WRITE_MULTIPLE_BLOCK");
/* Multiple block write */
for (i = 0; i < r->bufnum; ++i) {
#ifdef DEBUG
/* Check buffer */
if (r->bufs [i].length != e->block_size) {
RTEMS_DO_CLEANUP_RV( -RTEMS_INTERNAL_ERROR, rv, sd_card_disk_block_write_stop_cleanup, "Buffer and disk block size are not equal");
}
RTEMS_DEBUG_PRINT( "[%02u:%02u]: buffer = 0x%08x, size = %u\n", i + 1, r->bufnum, r->bufs [i].buffer, r->bufs [i].length);
#endif /* DEBUG */
rv = sd_card_write( e, SD_CARD_START_BLOCK_MULTIPLE_BLOCK_WRITE, (uint8_t *) r->bufs [i].buffer, (int) e->block_size);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_stop_cleanup, "Write block");
}
/* Stop multiple block write */
rv = sd_card_stop_multiple_block_write( e);
RTEMS_CLEANUP_RV( rv, sd_card_disk_block_write_cleanup, "Stop multiple block write");
}
/* Get card status */
rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS");
/* Stop */
sc = sd_card_stop( e);
RTEMS_CHECK_SC_RV( sc, "Stop");
/* Done */
rtems_blkdev_request_done( r, RTEMS_SUCCESSFUL);
return 0;
sd_card_disk_block_write_stop_cleanup:
/* Stop multiple block write */
sd_card_stop_multiple_block_write( e);
sd_card_disk_block_write_cleanup:
/* Get card status */
rv = sd_card_send_command( e, SD_CARD_CMD_SEND_STATUS, 0);
RTEMS_CHECK_RV( rv, "Send: SD_CARD_CMD_SEND_STATUS");
/* Stop */
sd_card_stop( e);
/* Done */
rtems_blkdev_request_done( r, RTEMS_IO_ERROR);
return 0;
}
static int sd_card_disk_ioctl( rtems_disk_device *dd, uint32_t req, void *arg)
{
RTEMS_DEBUG_PRINT( "sd_card_disk_ioctl req = 0x%08x, arg = %p\n", (unsigned)req, arg);
if (req == RTEMS_BLKIO_REQUEST) {
sd_card_driver_entry *e = rtems_disk_get_driver_data( dd);
rtems_blkdev_request *r = (rtems_blkdev_request *) arg;
int (*f)( sd_card_driver_entry *, rtems_blkdev_request *);
uint32_t retries = e->retries;
int result;
switch (r->req) {
case RTEMS_BLKDEV_REQ_READ:
f = sd_card_disk_block_read;
break;
case RTEMS_BLKDEV_REQ_WRITE:
f = sd_card_disk_block_write;
break;
default:
errno = EINVAL;
return -1;
}
do {
result = f( e, r);
} while (retries-- > 0 && result != 0);
return result;
} else if (req == RTEMS_BLKIO_CAPABILITIES) {
*(uint32_t *) arg = RTEMS_BLKDEV_CAP_MULTISECTOR_CONT;
return 0;
} else {
return rtems_blkdev_ioctl( dd, req, arg );
}
}
rtems_status_code sd_card_register( void)
{
size_t i;
for (i = 0; i < sd_card_driver_table_size; ++i) {
sd_card_driver_entry *e = &sd_card_driver_table [i];
uint32_t retries = e->retries;
rtems_status_code sc;
/* Initialize SD Card */
do {
sc = sd_card_init( e);
} while (retries-- > 0 && sc != RTEMS_SUCCESSFUL);
RTEMS_CHECK_SC( sc, "Initialize SD Card");
/* Create disk device */
sc = rtems_blkdev_create( e->device_name, e->block_size, e->block_number, sd_card_disk_ioctl, NULL);
RTEMS_CHECK_SC( sc, "Create disk device");
}
return RTEMS_SUCCESSFUL;
}
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