Works for 3.3V eMMC in 4 line mode. Not implemented: - DDR mode for SD cards (UHS-I) also need voltage to be switched to 1.8V. - 8-line DDR mode for eMMC to be implemented later.
233 lines
8.2 KiB
C
233 lines
8.2 KiB
C
/*
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* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
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* Adaptations to ESP-IDF Copyright (c) 2016-2018 Espressif Systems (Shanghai) PTE LTD
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <unistd.h>
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#include "sdmmc_common.h"
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static const char* TAG = "sdmmc_mmc";
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esp_err_t sdmmc_init_mmc_read_ext_csd(sdmmc_card_t* card)
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{
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int card_type;
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esp_err_t err = ESP_OK;
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uint8_t* ext_csd = heap_caps_malloc(EXT_CSD_MMC_SIZE, MALLOC_CAP_DMA);
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if (!ext_csd) {
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ESP_LOGE(TAG, "%s: could not allocate ext_csd", __func__);
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return ESP_ERR_NO_MEM;
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}
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uint32_t sectors = 0;
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ESP_LOGD(TAG, "MMC version: %d", card->csd.mmc_ver);
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if (card->csd.mmc_ver < MMC_CSD_MMCVER_4_0) {
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err = ESP_ERR_NOT_SUPPORTED;
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goto out;
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}
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/* read EXT_CSD */
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err = sdmmc_mmc_send_ext_csd_data(card, ext_csd, EXT_CSD_MMC_SIZE);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: send_ext_csd_data error 0x%x", __func__, err);
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goto out;
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}
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card_type = ext_csd[EXT_CSD_CARD_TYPE];
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card->is_ddr = 0;
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if (card_type & EXT_CSD_CARD_TYPE_F_52M_1_8V) {
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card->max_freq_khz = SDMMC_FREQ_52M;
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if ((card->host.flags & SDMMC_HOST_FLAG_DDR) &&
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card->host.max_freq_khz >= SDMMC_FREQ_26M &&
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card->host.get_bus_width(card->host.slot) == 4) {
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ESP_LOGD(TAG, "card and host support DDR mode");
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card->is_ddr = 1;
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}
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} else if (card_type & EXT_CSD_CARD_TYPE_F_52M) {
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card->max_freq_khz = SDMMC_FREQ_52M;
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} else if (card_type & EXT_CSD_CARD_TYPE_F_26M) {
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card->max_freq_khz = SDMMC_FREQ_26M;
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} else {
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ESP_LOGW(TAG, "%s: unknown CARD_TYPE 0x%x", __func__, card_type);
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}
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/* For MMC cards, use speed value from EXT_CSD */
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card->csd.tr_speed = card->max_freq_khz * 1000;
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ESP_LOGD(TAG, "MMC card type %d, max_freq_khz=%d, is_ddr=%d", card_type, card->max_freq_khz, card->is_ddr);
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card->max_freq_khz = MIN(card->max_freq_khz, card->host.max_freq_khz);
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if (card->host.flags & SDMMC_HOST_FLAG_8BIT) {
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card->ext_csd.power_class = ext_csd[(card->max_freq_khz > SDMMC_FREQ_26M) ?
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EXT_CSD_PWR_CL_52_360 : EXT_CSD_PWR_CL_26_360] >> 4;
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card->log_bus_width = 3;
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} else if (card->host.flags & SDMMC_HOST_FLAG_4BIT) {
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card->ext_csd.power_class = ext_csd[(card->max_freq_khz > SDMMC_FREQ_26M) ?
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EXT_CSD_PWR_CL_52_360 : EXT_CSD_PWR_CL_26_360] & 0x0f;
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card->log_bus_width = 2;
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} else {
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card->ext_csd.power_class = 0; //card must be able to do full rate at powerclass 0 in 1-bit mode
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card->log_bus_width = 0;
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}
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sectors = ( ext_csd[EXT_CSD_SEC_COUNT + 0] << 0 )
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| ( ext_csd[EXT_CSD_SEC_COUNT + 1] << 8 )
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| ( ext_csd[EXT_CSD_SEC_COUNT + 2] << 16 )
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| ( ext_csd[EXT_CSD_SEC_COUNT + 3] << 24 );
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if (sectors > (2u * 1024 * 1024 * 1024) / 512) {
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card->csd.capacity = sectors;
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}
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out:
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free(ext_csd);
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return err;
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}
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esp_err_t sdmmc_init_mmc_bus_width(sdmmc_card_t* card)
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{
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esp_err_t err;
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if (card->ext_csd.power_class != 0) {
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err = sdmmc_mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
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EXT_CSD_POWER_CLASS, card->ext_csd.power_class);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: can't change power class (%d bit), 0x%x"
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, __func__, card->ext_csd.power_class, err);
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return err;
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}
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}
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if (card->log_bus_width > 0) {
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int csd_bus_width_value = EXT_CSD_BUS_WIDTH_1;
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int bus_width = 1;
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if (card->log_bus_width == 2) {
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if (card->is_ddr) {
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csd_bus_width_value = EXT_CSD_BUS_WIDTH_4_DDR;
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} else {
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csd_bus_width_value = EXT_CSD_BUS_WIDTH_4;
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}
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bus_width = 4;
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} else if (card->log_bus_width == 3) {
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if (card->is_ddr) {
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csd_bus_width_value = EXT_CSD_BUS_WIDTH_8_DDR;
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} else {
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csd_bus_width_value = EXT_CSD_BUS_WIDTH_8;
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}
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bus_width = 8;
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}
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err = sdmmc_mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
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EXT_CSD_BUS_WIDTH, csd_bus_width_value);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: can't change bus width (%d bit), 0x%x",
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__func__, bus_width, err);
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return err;
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}
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_mmc_enable_hs_mode(sdmmc_card_t* card)
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{
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esp_err_t err;
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if (card->max_freq_khz > SDMMC_FREQ_26M) {
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/* switch to high speed timing */
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err = sdmmc_mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
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EXT_CSD_HS_TIMING, EXT_CSD_HS_TIMING_HS);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: mmc_switch EXT_CSD_HS_TIMING_HS error 0x%x",
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__func__, err);
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return err;
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}
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_mmc_decode_cid(int mmc_ver, sdmmc_response_t resp, sdmmc_cid_t* out_cid)
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{
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if (mmc_ver == MMC_CSD_MMCVER_1_0 ||
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mmc_ver == MMC_CSD_MMCVER_1_4) {
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out_cid->mfg_id = MMC_CID_MID_V1(resp);
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out_cid->oem_id = 0;
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MMC_CID_PNM_V1_CPY(resp, out_cid->name);
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out_cid->revision = MMC_CID_REV_V1(resp);
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out_cid->serial = MMC_CID_PSN_V1(resp);
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out_cid->date = MMC_CID_MDT_V1(resp);
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} else if (mmc_ver == MMC_CSD_MMCVER_2_0 ||
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mmc_ver == MMC_CSD_MMCVER_3_1 ||
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mmc_ver == MMC_CSD_MMCVER_4_0) {
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out_cid->mfg_id = MMC_CID_MID_V2(resp);
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out_cid->oem_id = MMC_CID_OID_V2(resp);
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MMC_CID_PNM_V1_CPY(resp, out_cid->name);
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out_cid->revision = 0;
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out_cid->serial = MMC_CID_PSN_V1(resp);
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out_cid->date = 0;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_mmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd)
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{
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out_csd->csd_ver = MMC_CSD_CSDVER(response);
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if (out_csd->csd_ver == MMC_CSD_CSDVER_1_0 ||
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out_csd->csd_ver == MMC_CSD_CSDVER_2_0 ||
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out_csd->csd_ver == MMC_CSD_CSDVER_EXT_CSD) {
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out_csd->mmc_ver = MMC_CSD_MMCVER(response);
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out_csd->capacity = MMC_CSD_CAPACITY(response);
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out_csd->read_block_len = MMC_CSD_READ_BL_LEN(response);
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} else {
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ESP_LOGE(TAG, "unknown MMC CSD structure version 0x%x\n", out_csd->csd_ver);
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return 1;
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}
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int read_bl_size = 1 << out_csd->read_block_len;
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out_csd->sector_size = MIN(read_bl_size, 512);
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if (out_csd->sector_size < read_bl_size) {
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out_csd->capacity *= read_bl_size / out_csd->sector_size;
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}
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/* tr_speed will be determined when reading CXD */
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out_csd->tr_speed = 0;
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return ESP_OK;
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}
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esp_err_t sdmmc_mmc_send_ext_csd_data(sdmmc_card_t* card, void *out_data, size_t datalen)
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{
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assert(esp_ptr_dma_capable(out_data));
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sdmmc_command_t cmd = {
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.data = out_data,
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.datalen = datalen,
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.blklen = datalen,
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.opcode = MMC_SEND_EXT_CSD,
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.arg = 0,
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.flags = SCF_CMD_ADTC | SCF_RSP_R1 | SCF_CMD_READ
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};
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return sdmmc_send_cmd(card, &cmd);
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}
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esp_err_t sdmmc_mmc_switch(sdmmc_card_t* card, uint8_t set, uint8_t index, uint8_t value)
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{
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sdmmc_command_t cmd = {
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.opcode = MMC_SWITCH,
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.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) | (index << 16) | (value << 8) | set,
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.flags = SCF_RSP_R1B | SCF_CMD_AC | SCF_WAIT_BUSY,
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};
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esp_err_t err = sdmmc_send_cmd(card, &cmd);
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if (err == ESP_OK) {
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//check response bit to see that switch was accepted
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if (MMC_R1(cmd.response) & MMC_R1_SWITCH_ERROR)
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err = ESP_ERR_INVALID_RESPONSE;
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}
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return err;
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}
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