diff options
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/ao_sdcard.c | 361 | ||||
| -rw-r--r-- | src/drivers/ao_sdcard.h | 19 |
2 files changed, 281 insertions, 99 deletions
diff --git a/src/drivers/ao_sdcard.c b/src/drivers/ao_sdcard.c index 952000a7..6073677a 100644 --- a/src/drivers/ao_sdcard.c +++ b/src/drivers/ao_sdcard.c @@ -28,11 +28,14 @@ #define ao_sdcard_deselect() ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,1) /* Include SD card commands */ -#define SDCARD_DEBUG 0 +#define SDCARD_DEBUG 1 /* Spew SD tracing */ #define SDCARD_TRACE 0 +/* Emit error and warning messages */ +#define SDCARD_WARN 0 + static uint8_t initialized; static uint8_t present; static uint8_t mutex; @@ -47,6 +50,38 @@ static enum ao_sdtype sdtype; #define DBG(...) #endif +#if SDCARD_WARN +#define WARN(...) printf(__VA_ARGS__) +#else +#define WARN(...) +#endif + +#define later(x,y) ((int16_t) ((x) - (y)) >= 0) + +/* + * Wait while the card is busy. The card will return a stream of 0xff + * when it is ready to accept a command + */ + +static uint8_t +ao_sdcard_wait_busy(void) +{ + uint16_t timeout = ao_time() + SDCARD_BUSY_TIMEOUT; + uint8_t reply; + for (;;) { + ao_sdcard_recv(&reply, 1); + DBG("\t\twait busy %02x\n", reply); + if (reply == 0xff) + break; + if (later(ao_time(), timeout)) { + WARN("wait busy timeout\n"); + return 0; + } + } + return 1; +} + + /* * Send an SD command and await the status reply */ @@ -57,15 +92,13 @@ ao_sdcard_send_cmd(uint8_t cmd, uint32_t arg) uint8_t data[6]; uint8_t reply; int i; + uint16_t timeout; DBG ("\tsend_cmd %d arg %08x\n", cmd, arg); + + /* Wait for the card to not be busy */ if (cmd != SDCARD_GO_IDLE_STATE) { - for (i = 0; i < SDCARD_CMD_TIMEOUT; i++) { - ao_sdcard_recv(&reply, 1); - if (reply == 0xff) - break; - } - if (i == SDCARD_CMD_TIMEOUT) + if (!ao_sdcard_wait_busy()) return SDCARD_STATUS_TIMEOUT; } @@ -85,13 +118,22 @@ ao_sdcard_send_cmd(uint8_t cmd, uint32_t arg) /* The first reply byte will be the status, * which must have the high bit clear */ - for (i = 0; i < SDCARD_CMD_TIMEOUT; i++) { + timeout = ao_time() + SDCARD_CMD_TIMEOUT; + for (;;) { ao_sdcard_recv(&reply, 1); DBG ("\t\tgot byte %02x\n", reply); if ((reply & 0x80) == 0) - return reply; + break; + if (later(ao_time(), timeout)) { + WARN("send_cmd %02x timeout\n", cmd); + return SDCARD_STATUS_TIMEOUT; + } } - return SDCARD_STATUS_TIMEOUT; +#if SDCARD_WARN + if (reply != SDCARD_STATUS_READY_STATE && reply != SDCARD_STATUS_IDLE_STATE) + WARN("send_cmd %d failed %02x\n", cmd, reply); +#endif + return reply; } /* @@ -109,21 +151,8 @@ ao_sdcard_recv_reply(uint8_t *reply, int len) } /* - * Wait while the card is busy. The - * card will return a stream of 0xff - * until it isn't busy anymore + * Switch to 'idle' state. This is used to get the card into SPI mode */ -static void -ao_sdcard_wait_busy(void) -{ - uint8_t v; - - do { - ao_sdcard_recv(&v, 1); - } while (v != 0xff); - ao_sdcard_send_fixed(0xff, 1); -} - static uint8_t ao_sdcard_go_idle_state(void) { @@ -175,20 +204,33 @@ ao_sdcard_send_if_cond(uint32_t arg, uint8_t send_if_cond_response[4]) return ret; } -static uint8_t -ao_sdcard_send_status(void) +/* + * _ao_sdcard_send_status + * + * Get the 2-byte status value. + * + * Called from other functions with CS held low already, + * hence prefixing the name with '_' + */ +static uint16_t +_ao_sdcard_send_status(void) { uint8_t ret; + uint8_t extra; DBG ("send_status\n"); - ao_sdcard_select(); ret = ao_sdcard_send_cmd(SDCARD_SEND_STATUS, 0); - ao_sdcard_recv_reply(NULL, 0); + ao_sdcard_recv_reply(&extra, 1); if (ret != SDCARD_STATUS_READY_STATE) DBG ("\tsend_if_cond failed %02x\n", ret); - return ret; + return ret | (extra << 8); } +/* + * ao_sdcard_set_blocklen + * + * Set the block length for future read and write commands + */ static uint8_t ao_sdcard_set_blocklen(uint32_t blocklen) { @@ -198,21 +240,28 @@ ao_sdcard_set_blocklen(uint32_t blocklen) ao_sdcard_select(); ret = ao_sdcard_send_cmd(SDCARD_SET_BLOCKLEN, blocklen); ao_sdcard_recv_reply(NULL, 0); + ao_sdcard_deselect(); if (ret != SDCARD_STATUS_READY_STATE) DBG ("\tsend_if_cond failed %02x\n", ret); return ret; } +/* + * _ao_sdcard_app_cmd + * + * Send the app command prefix + * + * Called with the CS held low, hence + * the '_' prefix + */ static uint8_t -ao_sdcard_app_cmd(void) +_ao_sdcard_app_cmd(void) { uint8_t ret; DBG ("app_cmd\n"); - ao_sdcard_select(); ret = ao_sdcard_send_cmd(SDCARD_APP_CMD, 0); ao_sdcard_recv_reply(NULL, 0); - ao_sdcard_deselect(); DBG ("\tapp_cmd status %02x\n"); return ret; } @@ -222,13 +271,14 @@ ao_sdcard_app_send_op_cond(uint32_t arg) { uint8_t ret; - ret = ao_sdcard_app_cmd(); - if (ret != SDCARD_STATUS_IDLE_STATE) - return ret; DBG("send_op_comd\n"); ao_sdcard_select(); + ret = _ao_sdcard_app_cmd(); + if (ret != SDCARD_STATUS_IDLE_STATE) + goto bail; ret = ao_sdcard_send_cmd(SDCARD_APP_SEND_OP_COMD, arg); ao_sdcard_recv_reply(NULL, 0); +bail: ao_sdcard_deselect(); DBG ("\tapp_send_op_cond status %02x\n", ret); return ret; @@ -254,6 +304,10 @@ ao_sdcard_read_ocr(uint8_t read_ocr_response[4]) return ret; } +/* + * Follow the flow-chart defined by the SD group to + * initialize the card and figure out what kind it is + */ static void ao_sdcard_setup(void) { @@ -269,10 +323,7 @@ ao_sdcard_setup(void) */ ao_sdcard_send_fixed(0xff, 10); - ao_delay(AO_MS_TO_TICKS(10)); - /* Reset the card and get it into SPI mode */ - for (i = 0; i < SDCARD_IDLE_WAIT; i++) { if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE) break; @@ -281,7 +332,6 @@ ao_sdcard_setup(void) goto bail; /* Figure out what kind of card we have */ - sdtype = ao_sdtype_unknown; if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) { @@ -338,17 +388,84 @@ bail: } static uint8_t +_ao_sdcard_reset(void) +{ + int i; + uint8_t ret; + uint8_t response[10]; + + for (i = 0; i < SDCARD_IDLE_WAIT; i++) { + if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE) + break; + } + if (i == SDCARD_IDLE_WAIT) { + ret = 0x3f; + goto bail; + } + + /* Follow the setup path to get the card out of idle state and + * up and running again + */ + if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) { + uint32_t arg = 0; + uint8_t sdver2 = 0; + + /* Check for SD version 2 */ + if ((response[2] & 0xf) == 1 && response[3] == 0xaa) { + arg = 0x40000000; + sdver2 = 1; + } + + for (i = 0; i < SDCARD_IDLE_WAIT; i++) { + ret = ao_sdcard_app_send_op_cond(arg); + if (ret != SDCARD_STATUS_IDLE_STATE) + break; + } + + if (ret != SDCARD_STATUS_READY_STATE) { + /* MMC */ + for (i = 0; i < SDCARD_IDLE_WAIT; i++) { + ret = ao_sdcard_send_op_cond(); + if (ret != SDCARD_STATUS_IDLE_STATE) + break; + } + if (ret != SDCARD_STATUS_READY_STATE) + goto bail; + } + + /* For everything but SDHC cards, set the block length */ + if (sdtype != ao_sdtype_sd2block) { + ret = ao_sdcard_set_blocklen(512); + if (ret != SDCARD_STATUS_READY_STATE) + DBG ("set_blocklen failed, ignoring\n"); + } + } +bail: + return ret; +} + +/* + * The card will send 0xff until it is ready to send + * the data block at which point it will send the START_BLOCK + * marker followed by the data. This function waits while + * the card is sending 0xff + */ +static uint8_t ao_sdcard_wait_block_start(void) { - int i; - uint8_t v; + uint8_t v; + uint16_t timeout = ao_time() + SDCARD_BLOCK_TIMEOUT; DBG ("\twait_block_start\n"); - for (i = 0; i < SDCARD_BLOCK_TIMEOUT; i++) { + for (;;) { ao_sdcard_recv(&v, 1); DBG("\t\trecv %02x\n", v); if (v != 0xff) break; + if (later(ao_time(), timeout)) { + printf ("wait block start timeout\n"); + return 0xff; + } } return v; } @@ -360,7 +477,9 @@ uint8_t ao_sdcard_read_block(uint32_t block, uint8_t *data) { uint8_t ret; + uint8_t start_block; uint8_t crc[2]; + int tries; ao_sdcard_lock(); if (!initialized) { @@ -376,25 +495,53 @@ ao_sdcard_read_block(uint32_t block, uint8_t *data) DBG("read block %d\n", block); if (sdtype != ao_sdtype_sd2block) block <<= 9; + ao_sdcard_get(); - ao_sdcard_select(); - ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block); - ao_sdcard_recv_reply(NULL, 0); - if (ret != SDCARD_STATUS_READY_STATE) - goto bail; + for (tries = 0; tries < 10; tries++) { + ao_sdcard_select(); - /* Wait for the data start block marker */ - if (ao_sdcard_wait_block_start() != SDCARD_DATA_START_BLOCK) { - ret = 0x3f; - goto bail; - } + ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block); + ao_sdcard_recv_reply(NULL, 0); + if (ret != SDCARD_STATUS_READY_STATE) { + uint16_t status; + WARN ("read block command failed %d status %02x\n", block, ret); + status = _ao_sdcard_send_status(); + WARN ("\tstatus now %04x\n", status); + goto bail; + } - ao_sdcard_recv(data, 512); - ao_sdcard_recv(crc, 2); -bail: - ao_sdcard_deselect(); + ao_sdcard_send_fixed(0xff, 1); + + /* Wait for the data start block marker */ + start_block = ao_sdcard_wait_block_start(); + if (start_block != SDCARD_DATA_START_BLOCK) { + WARN ("wait block start failed %02x\n", start_block); + ret = 0x3f; + goto bail; + } + + ao_sdcard_recv(data, 512); + ao_sdcard_recv(crc, 2); + bail: + ao_sdcard_deselect(); + if (ret == SDCARD_STATUS_READY_STATE) + break; + if (ret == SDCARD_STATUS_IDLE_STATE) { + ret = _ao_sdcard_reset(); + if (ret != SDCARD_STATUS_READY_STATE) + break; + } + } ao_sdcard_put(); ao_sdcard_unlock(); + +#if SDCARD_WARN + if (ret != SDCARD_STATUS_READY_STATE) + WARN("read failed\n"); + else if (tries) + WARN("took %d tries to read %d\n", tries + 1, block); +#endif + DBG("read %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure"); return ret == SDCARD_STATUS_READY_STATE; } @@ -406,9 +553,12 @@ uint8_t ao_sdcard_write_block(uint32_t block, uint8_t *data) { uint8_t ret; - uint8_t response; - uint8_t start_block[2]; + uint8_t response[1]; + uint8_t start_block[8]; + uint16_t status; + static uint8_t check_data[512]; int i; + int tries; ao_sdcard_lock(); if (!initialized) { @@ -424,45 +574,64 @@ ao_sdcard_write_block(uint32_t block, uint8_t *data) DBG("write block %d\n", block); if (sdtype != ao_sdtype_sd2block) block <<= 9; - ao_sdcard_get(); - ao_sdcard_select(); - ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block); - ao_sdcard_recv_reply(NULL, 0); - if (ret != SDCARD_STATUS_READY_STATE) - goto bail; - - /* Write a pad byte followed by the data start block marker */ - start_block[0] = 0xff; - start_block[1] = SDCARD_DATA_START_BLOCK; - ao_sdcard_send(start_block, 2); - - /* Send the data */ - ao_sdcard_send(data, 512); - - /* Fake the CRC */ - ao_sdcard_send_fixed(0xff, 2); + ao_sdcard_get(); - /* See if the card liked the data */ - ao_sdcard_recv(&response, 1); - if ((response & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) { - ret = 0x3f; - goto bail; - } + for (tries = 0; tries < 10; tries++) { + ao_sdcard_select(); + + ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block); + ao_sdcard_recv_reply(NULL, 0); + if (ret != SDCARD_STATUS_READY_STATE) + goto bail; + + /* Write a pad byte followed by the data start block marker */ + start_block[0] = 0xff; + start_block[1] = SDCARD_DATA_START_BLOCK; + ao_sdcard_send(start_block, 2); + + /* Send the data */ + ao_sdcard_send(data, 512); + + /* Fake the CRC */ + ao_sdcard_send_fixed(0xff, 2); + + /* See if the card liked the data */ + ao_sdcard_recv(response, sizeof (response)); + if ((response[0] & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) { + int i; + WARN("Data not accepted, response"); + for (i = 0; i < sizeof (response); i++) + WARN(" %02x", response[i]); + WARN("\n"); + ret = 0x3f; + goto bail; + } - /* Wait for the bus to go idle (should be done with an interrupt) */ - for (i = 0; i < SDCARD_IDLE_TIMEOUT; i++) { - ao_sdcard_recv(&response, 1); - if (response == 0xff) + /* Wait for the bus to go idle (should be done with an interrupt?) */ + if (!ao_sdcard_wait_busy()) { + ret = 0x3f; + goto bail; + } + + /* Check the current status after the write completes */ + status = _ao_sdcard_send_status(); + if ((status & 0xff) != SDCARD_STATUS_READY_STATE) { + WARN ("send status after write %04x\n", status); + ret = status & 0xff; + goto bail; + } + bail: + ao_sdcard_deselect(); + DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure"); + if (ret == SDCARD_STATUS_READY_STATE) break; } - if (i == SDCARD_IDLE_TIMEOUT) - ret = 0x3f; -bail: - ao_sdcard_deselect(); ao_sdcard_put(); ao_sdcard_unlock(); - DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure"); + if (tries) + WARN("took %d tries to write %d\n", tries + 1, block); + return ret == SDCARD_STATUS_READY_STATE; } @@ -473,9 +642,17 @@ static void ao_sdcard_test_read(void) { int i; - if (!ao_sdcard_read_block(1, test_data)) { - printf ("read error\n"); + + ao_cmd_decimal(); + if (ao_cmd_status != ao_cmd_success) return; + + for (i = 0; i < 100; i++) { + printf ("."); flush(); + if (!ao_sdcard_read_block(ao_cmd_lex_u32+i, test_data)) { + printf ("read error %d\n", i); + return; + } } printf ("data:"); for (i = 0; i < 18; i++) diff --git a/src/drivers/ao_sdcard.h b/src/drivers/ao_sdcard.h index 512439b4..e55a3dec 100644 --- a/src/drivers/ao_sdcard.h +++ b/src/drivers/ao_sdcard.h @@ -49,9 +49,14 @@ ao_sdcard_init(void); #define SDCARD_APP_SEND_OP_COMD 41 /* Status */ -#define SDCARD_STATUS_READY_STATE 0 -#define SDCARD_STATUS_IDLE_STATE 1 -#define SDCARD_STATUS_ILLEGAL_COMMAND 4 +#define SDCARD_STATUS_READY_STATE 0x00 +#define SDCARD_STATUS_IDLE_STATE 0x01 +#define SDCARD_STATUS_ERASE_RESET 0x02 +#define SDCARD_STATUS_ILLEGAL_COMMAND 0x04 +#define SDCARD_STATUS_COM_CRC_ERROR 0x08 +#define SDCARD_STATUS_ERASE_SEQ_ERROR 0x10 +#define SDCARD_STATUS_ADDRESS_ERROR 0x20 +#define SDCARD_STATUS_PARAMETER_ERROR 0x40 #define SDCARD_STATUS_TIMEOUT 0xff #define SDCARD_DATA_START_BLOCK 0xfe @@ -60,10 +65,10 @@ ao_sdcard_init(void); #define SDCARD_DATA_RES_MASK 0x1f #define SDCARD_DATA_RES_ACCEPTED 0x05 -#define SDCARD_CMD_TIMEOUT 100 -#define SDCARD_IDLE_WAIT 1000 -#define SDCARD_BLOCK_TIMEOUT 100 -#define SDCARD_IDLE_TIMEOUT 1000 +#define SDCARD_CMD_TIMEOUT AO_MS_TO_TICKS(100) +#define SDCARD_BUSY_TIMEOUT AO_MS_TO_TICKS(100) +#define SDCARD_IDLE_WAIT 10000 +#define SDCARD_BLOCK_TIMEOUT AO_MS_TO_TICKS(1000) enum ao_sdtype { ao_sdtype_unknown, |