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sdmmc: add support for high speed (HS) mode

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By default SD cards are initialized in default speed (DS) mode. Enabling
HS mode requires SWITCH_FUNC command to be sent twice: first time to
query if the card supports switching to HS mode, second time to perform
the switch.

This change implements SWITCH_FUNC command and adds the procedure to
switch to HS mode.
This commit is contained in:
Ivan Grokhotkov 2017-07-12 21:17:28 +08:00
parent 9253d316e7
commit 6baf8195ee
3 changed files with 200 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
components/driver/include/driver/sdmmc_defs.h
View file

@ -294,15 +294,34 @@
#define SCR_CMD_SUPPORT_CMD20(scr) MMC_RSP_BITS((scr), 32, 1)
#define SCR_RESERVED2(scr) MMC_RSP_BITS((scr), 0, 32)
/* Status of Switch Function */
#define SFUNC_STATUS_GROUP(status, group) \
(__bitfield((uint32_t *)(status), 400 + (group - 1) * 16, 16))
/* Max supply current in SWITCH_FUNC response (in mA) */
#define SD_SFUNC_I_MAX(status) (MMC_RSP_BITS((uint32_t *)(status), 496, 16))
#define SD_ACCESS_MODE_SDR12 0
#define SD_ACCESS_MODE_SDR25 1
#define SD_ACCESS_MODE_SDR50 2
#define SD_ACCESS_MODE_SDR104 3
#define SD_ACCESS_MODE_DDR50 4
/* Supported flags in SWITCH_FUNC response */
#define SD_SFUNC_SUPPORTED(status, group) \
(MMC_RSP_BITS((uint32_t *)(status), 400 + (group - 1) * 16, 16))
/* Selected function in SWITCH_FUNC response */
#define SD_SFUNC_SELECTED(status, group) \
(MMC_RSP_BITS((uint32_t *)(status), 376 + (group - 1) * 4, 4))
/* Busy flags in SWITCH_FUNC response */
#define SD_SFUNC_BUSY(status, group) \
(MMC_RSP_BITS((uint32_t *)(status), 272 + (group - 1) * 16, 16))
/* Version of SWITCH_FUNC response */
#define SD_SFUNC_VER(status) (MMC_RSP_BITS((uint32_t *)(status), 368, 8))
#define SD_SFUNC_GROUP_MAX 6
#define SD_SFUNC_FUNC_MAX 15
#define SD_ACCESS_MODE 1 /* Function group 1, Access Mode */
#define SD_ACCESS_MODE_SDR12 0 /* 25 MHz clock */
#define SD_ACCESS_MODE_SDR25 1 /* 50 MHz clock */
#define SD_ACCESS_MODE_SDR50 2 /* UHS-I, 100 MHz clock */
#define SD_ACCESS_MODE_SDR104 3 /* UHS-I, 208 MHz clock */
#define SD_ACCESS_MODE_DDR50 4 /* UHS-I, 50 MHz clock, DDR */
/**
* @brief Extract up to 32 sequential bits from an array of 32-bit words

7
components/driver/include/driver/sdmmc_types.h
View file

@ -60,6 +60,13 @@ typedef struct {
*/
typedef uint32_t sdmmc_response_t[4];
/**
* SD SWITCH_FUNC response buffer
*/
typedef struct {
uint32_t data[512 / 8 / sizeof(uint32_t)]; /*!< response data */
} sdmmc_switch_func_rsp_t;
/**
* SD/MMC command information
*/

184
components/sdmmc/sdmmc_cmd.c
View file

@ -41,6 +41,10 @@ static esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid);
static esp_err_t sddmc_send_cmd_all_send_cid(sdmmc_card_t* card, sdmmc_cid_t* out_cid);
static esp_err_t sdmmc_send_cmd_set_relative_addr(sdmmc_card_t* card, uint16_t* out_rca);
static esp_err_t sdmmc_send_cmd_set_blocklen(sdmmc_card_t* card, sdmmc_csd_t* csd);
static esp_err_t sdmmc_send_cmd_switch_func(sdmmc_card_t* card,
uint32_t mode, uint32_t group, uint32_t function,
sdmmc_switch_func_rsp_t* resp);
static esp_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card);
static esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_send_csd(sdmmc_card_t* card, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_select_card(sdmmc_card_t* card, uint32_t rca);
@ -153,7 +157,7 @@ esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err);
ESP_LOGE(TAG, "%s: send_csd (1) returned 0x%x", __func__, err);
return err;
}
const size_t max_sdsc_capacity = UINT32_MAX / card->csd.sector_size + 1;
@ -214,32 +218,87 @@ esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
if (config->max_freq_khz >= SDMMC_FREQ_HIGHSPEED &&
card->csd.tr_speed / 1000 >= SDMMC_FREQ_HIGHSPEED) {
ESP_LOGD(TAG, "switching to HS bus mode");
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_HIGHSPEED);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
/* So far initialization has been done using 400kHz clock. Determine the
* clock rate which both host and the card support, and switch to it.
*/
bool freq_switched = false;
if (config->max_freq_khz >= SDMMC_FREQ_HIGHSPEED) {
/* This will determine if the card supports SWITCH_FUNC command,
* and high speed mode. If the cards supports both, this will enable
* high speed mode at the card side.
*/
err = sdmmc_enable_hs_mode(card);
if (err == ESP_ERR_NOT_SUPPORTED) {
ESP_LOGD(TAG, "%s: host supports HS mode, but card doesn't", __func__);
} else if (err != ESP_OK) {
/* some other error */
return err;
} else { /* ESP_OK */
/* HS mode has been enabled on the card.
* Read CSD again, it should now indicate that the card supports
* 50MHz clock.
* Since SEND_CSD is allowed only in standby mode, and the card is
* currently in data transfer more, deselect the card first, then
* get the CSD, then select the card again.
*/
err = sdmmc_send_cmd_select_card(card, 0);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card (2) returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_csd (2) returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_select_card(card, card->rca);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card (3) returned 0x%x", __func__, err);
return err;
}
if (card->csd.tr_speed != 50000000) {
ESP_LOGW(TAG, "unexpected: after enabling HS mode, tr_speed=%d", card->csd.tr_speed);
} else {
/* Finally can switch the host to HS mode */
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_HIGHSPEED);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
freq_switched = true;
}
}
} else if (config->max_freq_khz >= SDMMC_FREQ_DEFAULT &&
card->csd.tr_speed / 1000 >= SDMMC_FREQ_DEFAULT) {
}
/* All SD cards must support default speed mode (25MHz).
* config->max_freq_khz may be used to limit the clock frequency.
*/
if (!freq_switched &&
config->max_freq_khz >= SDMMC_FREQ_DEFAULT) {
ESP_LOGD(TAG, "switching to DS bus mode");
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_DEFAULT);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
freq_switched = true;
}
sdmmc_scr_t scr_tmp;
err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr returned 0x%x", __func__, err);
return err;
}
if (memcmp(&card->scr, &scr_tmp, sizeof(scr_tmp)) != 0) {
ESP_LOGE(TAG, "got corrupted data after increasing clock frequency");
return ESP_ERR_INVALID_RESPONSE;
/* If frequency switch has been performed, read SCR register one more time
* and compare the result with the previous one. Use this simple check as
* an indicator of potential signal integrity issues.
*/
if (freq_switched) {
sdmmc_scr_t scr_tmp;
err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr (2) returned 0x%x", __func__, err);
return err;
}
if (memcmp(&card->scr, &scr_tmp, sizeof(scr_tmp)) != 0) {
ESP_LOGE(TAG, "got corrupted data after increasing clock frequency");
return ESP_ERR_INVALID_RESPONSE;
}
}
return ESP_OK;
}
@ -777,3 +836,92 @@ static esp_err_t sdmmc_read_sectors_dma(sdmmc_card_t* card, void* dst,
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_switch_func(sdmmc_card_t* card,
uint32_t mode, uint32_t group, uint32_t function,
sdmmc_switch_func_rsp_t* resp)
{
if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
return ESP_ERR_NOT_SUPPORTED;
}
if (group == 0 ||
group > SD_SFUNC_GROUP_MAX ||
function > SD_SFUNC_FUNC_MAX) {
return ESP_ERR_INVALID_ARG;
}
if (mode > 1) {
return ESP_ERR_INVALID_ARG;
}
uint32_t group_shift = (group - 1) << 2;
/* all functions which should not be affected are set to 0xf (no change) */
uint32_t other_func_mask = (0x00ffffff & ~(0xf << group_shift));
uint32_t func_val = (function << group_shift) | other_func_mask;
sdmmc_command_t cmd = {
.opcode = MMC_SWITCH,
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.blklen = sizeof(sdmmc_switch_func_rsp_t),
.data = resp->data,
.datalen = sizeof(sdmmc_switch_func_rsp_t),
.arg = (!!mode << 31) | func_val
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
flip_byte_order(resp->data, sizeof(sdmmc_switch_func_rsp_t));
uint32_t resp_ver = SD_SFUNC_VER(resp->data);
if (resp_ver == 0) {
/* busy response is never sent */
} else if (resp_ver == 1) {
if (SD_SFUNC_BUSY(resp->data, group) & (1 << function)) {
ESP_LOGD(TAG, "%s: response indicates function %d:%d is busy",
__func__, group, function);
return ESP_ERR_INVALID_STATE;
}
} else {
ESP_LOGD(TAG, "%s: got an invalid version of SWITCH_FUNC response: 0x%02x",
__func__, resp_ver);
return ESP_ERR_INVALID_RESPONSE;
}
return ESP_OK;
}
static esp_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card)
{
if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
return ESP_ERR_NOT_SUPPORTED;
}
sdmmc_switch_func_rsp_t* response = (sdmmc_switch_func_rsp_t*)
heap_caps_malloc(sizeof(*response), MALLOC_CAP_DMA);
if (response == NULL) {
return ESP_ERR_NO_MEM;
}
esp_err_t err = sdmmc_send_cmd_switch_func(card, 0, SD_ACCESS_MODE, 0, response);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (1) returned 0x%x", __func__, err);
goto out;
}
uint32_t supported_mask = SD_SFUNC_SUPPORTED(response->data, 1);
if ((supported_mask & BIT(SD_ACCESS_MODE_SDR25)) == 0) {
err = ESP_ERR_NOT_SUPPORTED;
goto out;
}
err = sdmmc_send_cmd_switch_func(card, 1, SD_ACCESS_MODE, SD_ACCESS_MODE_SDR25, response);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (2) returned 0x%x", __func__, err);
goto out;
}
out:
free(response);
return err;
}