circuitpython/lib/sdmmc/sdmmc_sd.c

344 lines
12 KiB
C

/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
* Adaptations to ESP-IDF Copyright (c) 2016-2018 Espressif Systems (Shanghai) PTE LTD
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include "sdmmc_common.h"
sdmmc_err_t sdmmc_init_sd_if_cond(sdmmc_card_t* card)
{
/* SEND_IF_COND (CMD8) command is used to identify SDHC/SDXC cards.
* SD v1 and non-SD cards will not respond to this command.
*/
uint32_t host_ocr = get_host_ocr(card->host.io_voltage);
sdmmc_err_t err = sdmmc_send_cmd_send_if_cond(card, host_ocr);
if (err == SDMMC_OK) {
ESP_LOGD(TAG, "SDHC/SDXC card");
host_ocr |= SD_OCR_SDHC_CAP;
} else if (err == SDMMC_ERR_TIMEOUT) {
ESP_LOGD(TAG, "CMD8 timeout; not an SD v2.00 card");
} else if (host_is_spi(card) && err == SDMMC_ERR_NOT_SUPPORTED) {
ESP_LOGD(TAG, "CMD8 rejected; not an SD v2.00 card");
} else {
ESP_LOGE(TAG, "%s: send_if_cond (1) returned 0x%x", __func__, err);
return err;
}
card->ocr = host_ocr;
return SDMMC_OK;
}
sdmmc_err_t sdmmc_init_sd_blocklen(sdmmc_card_t* card)
{
/* SDSC cards support configurable data block lengths.
* We don't use this feature and set the block length to 512 bytes,
* same as the block length for SDHC cards.
*/
if ((card->ocr & SD_OCR_SDHC_CAP) == 0) {
sdmmc_err_t err = sdmmc_send_cmd_set_blocklen(card, &card->csd);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: set_blocklen returned 0x%x", __func__, err);
return err;
}
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_init_sd_scr(sdmmc_card_t* card)
{
sdmmc_err_t err;
/* Get the contents of SCR register: bus width and the version of SD spec
* supported by the card.
* In SD mode, this is the first command which uses D0 line. Errors at
* this step usually indicate connection issue or lack of pull-up resistor.
*/
err = sdmmc_send_cmd_send_scr(card, &card->scr);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: send_scr (1) returned 0x%x", __func__, err);
return err;
}
if ((card->scr.bus_width & SCR_SD_BUS_WIDTHS_4BIT)
&& (card->host.flags & SDMMC_HOST_FLAG_4BIT)) {
card->log_bus_width = 2;
} else {
card->log_bus_width = 0;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_init_sd_bus_width(sdmmc_card_t* card)
{
int width = 1;
if (card->log_bus_width == 2) {
width = 4;
} else if (card->log_bus_width == 3) {
width = 8;
}
sdmmc_err_t err = sdmmc_send_cmd_set_bus_width(card, width);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "set_bus_width failed (0x%x)", err);
return err;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_init_sd_wait_data_ready(sdmmc_card_t* card)
{
/* Wait for the card to be ready for data transfers */
uint32_t status = 0;
uint32_t count = 0;
while (!host_is_spi(card) && !(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
sdmmc_err_t err = sdmmc_send_cmd_send_status(card, &status);
if (err != SDMMC_OK) {
return err;
}
if (++count % 16 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
return SDMMC_OK;
}
sdmmc_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 SDMMC_ERR_NOT_SUPPORTED;
}
if (group == 0 ||
group > SD_SFUNC_GROUP_MAX ||
function > SD_SFUNC_FUNC_MAX) {
return SDMMC_ERR_INVALID_ARG;
}
if (mode > 1) {
return SDMMC_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
};
sdmmc_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
sdmmc_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 SDMMC_ERR_BUSY;
}
} else {
ESP_LOGD(TAG, "%s: got an invalid version of SWITCH_FUNC response: 0x%02x",
__func__, resp_ver);
return SDMMC_ERR_INVALID_RESPONSE;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card)
{
/* 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.
*/
if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
return SDMMC_ERR_NOT_SUPPORTED;
}
sdmmc_switch_func_rsp_t response;
sdmmc_err_t err = sdmmc_send_cmd_switch_func(card, 0, SD_ACCESS_MODE, 0, &response);
if (err != SDMMC_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (1) returned 0x%x", __func__, err);
return err;
}
uint32_t supported_mask = SD_SFUNC_SUPPORTED(response.data, 1);
if ((supported_mask & BIT(SD_ACCESS_MODE_SDR25)) == 0) {
return SDMMC_ERR_NOT_SUPPORTED;
}
err = sdmmc_send_cmd_switch_func(card, 1, SD_ACCESS_MODE, SD_ACCESS_MODE_SDR25, &response);
if (err != SDMMC_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (2) returned 0x%x", __func__, err);
return err;
}
return err;
}
sdmmc_err_t sdmmc_enable_hs_mode_and_check(sdmmc_card_t* card)
{
/* All cards should support at least default speed */
card->max_freq_khz = SDMMC_FREQ_DEFAULT;
if (card->host.max_freq_khz <= card->max_freq_khz) {
/* Host is configured to use low frequency, don't attempt to switch */
card->max_freq_khz = card->host.max_freq_khz;
return SDMMC_OK;
}
/* Try to enabled HS mode */
sdmmc_err_t err = sdmmc_enable_hs_mode(card);
if (err != SDMMC_OK) {
return err;
}
/* 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
* mode, deselect the card first, then get the CSD, then select the card again. This step is
* not required in SPI mode, since CMD7 (select_card) is not supported.
*/
const bool is_spi = host_is_spi(card);
if (!is_spi) {
err = sdmmc_send_cmd_select_card(card, 0);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: select_card (1) returned 0x%x", __func__, err);
return err;
}
}
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err);
return err;
}
if (!is_spi) {
err = sdmmc_send_cmd_select_card(card, card->rca);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: select_card (2) 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);
return SDMMC_ERR_NOT_SUPPORTED;
}
card->max_freq_khz = SDMMC_FREQ_HIGHSPEED;
return SDMMC_OK;
}
sdmmc_err_t sdmmc_check_scr(sdmmc_card_t* card)
{
/* 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.
*/
sdmmc_scr_t scr_tmp;
sdmmc_err_t err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
if (err != SDMMC_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 SDMMC_ERR_INVALID_RESPONSE;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_init_spi_crc(sdmmc_card_t* card)
{
/* In SD mode, CRC checks of data transfers are mandatory and performed
* by the hardware. In SPI mode, CRC16 of data transfers is optional and
* needs to be enabled.
*/
assert(host_is_spi(card));
sdmmc_err_t err = sdmmc_send_cmd_crc_on_off(card, true);
if (err != SDMMC_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd_crc_on_off returned 0x%x", __func__, err);
return err;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid)
{
out_cid->mfg_id = SD_CID_MID(resp);
out_cid->oem_id = SD_CID_OID(resp);
SD_CID_PNM_CPY(resp, out_cid->name);
out_cid->revision = SD_CID_REV(resp);
out_cid->serial = SD_CID_PSN(resp);
out_cid->date = SD_CID_MDT(resp);
return SDMMC_OK;
}
sdmmc_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd)
{
out_csd->csd_ver = SD_CSD_CSDVER(response);
switch (out_csd->csd_ver) {
case SD_CSD_CSDVER_2_0:
out_csd->capacity = SD_CSD_V2_CAPACITY(response);
out_csd->read_block_len = SD_CSD_V2_BL_LEN;
break;
case SD_CSD_CSDVER_1_0:
out_csd->capacity = SD_CSD_CAPACITY(response);
out_csd->read_block_len = SD_CSD_READ_BL_LEN(response);
break;
default:
ESP_LOGE(TAG, "unknown SD CSD structure version 0x%x", out_csd->csd_ver);
return SDMMC_ERR_NOT_SUPPORTED;
}
out_csd->card_command_class = SD_CSD_CCC(response);
int read_bl_size = 1 << out_csd->read_block_len;
out_csd->sector_size = TSD_MIN(read_bl_size, 512);
if (out_csd->sector_size < read_bl_size) {
out_csd->capacity *= read_bl_size / out_csd->sector_size;
}
int speed = SD_CSD_SPEED(response);
if (speed == SD_CSD_SPEED_50_MHZ) {
out_csd->tr_speed = 50000000;
} else {
out_csd->tr_speed = 25000000;
}
return SDMMC_OK;
}
sdmmc_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr)
{
sdmmc_response_t resp = { 0 };
resp[1] = __builtin_bswap32(raw_scr[0]);
resp[0] = __builtin_bswap32(raw_scr[1]);
int ver = SCR_STRUCTURE(resp);
if (ver != 0) {
return SDMMC_ERR_NOT_SUPPORTED;
}
out_scr->sd_spec = SCR_SD_SPEC(resp);
out_scr->bus_width = SCR_SD_BUS_WIDTHS(resp);
return SDMMC_OK;
}