kopia lustrzana https://github.com/espressif/esp-idf
353 wiersze
12 KiB
C
353 wiersze
12 KiB
C
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/*
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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 "sdmmc_common.h"
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static const char* TAG = "sdmmc_io";
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esp_err_t sdmmc_io_reset(sdmmc_card_t* card)
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{
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uint8_t sdio_reset = CCCR_CTL_RES;
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esp_err_t err = sdmmc_io_rw_direct(card, 0, SD_IO_CCCR_CTL, SD_ARG_CMD52_WRITE, &sdio_reset);
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if (err == ESP_ERR_TIMEOUT || (host_is_spi(card) && err == ESP_ERR_NOT_SUPPORTED)) {
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/* Non-IO cards are allowed to time out (in SD mode) or
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* return "invalid command" error (in SPI mode).
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*/
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} else if (err == ESP_ERR_NOT_FOUND) {
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ESP_LOGD(TAG, "%s: card not present", __func__);
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return err;
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} else if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: unexpected return: 0x%x", __func__, err );
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return err;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_init_io(sdmmc_card_t* card)
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{
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/* IO_SEND_OP_COND(CMD5), Determine if the card is an IO card.
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* Non-IO cards will not respond to this command.
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*/
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esp_err_t err = sdmmc_io_send_op_cond(card, 0, &card->ocr);
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if (err != ESP_OK) {
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ESP_LOGD(TAG, "%s: io_send_op_cond (1) returned 0x%x; not IO card", __func__, err);
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card->is_sdio = 0;
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card->is_mem = 1;
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} else {
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card->is_sdio = 1;
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if (card->ocr & SD_IO_OCR_MEM_PRESENT) {
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ESP_LOGD(TAG, "%s: IO-only card", __func__);
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card->is_mem = 0;
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}
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card->num_io_functions = SD_IO_OCR_NUM_FUNCTIONS(card->ocr);
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ESP_LOGD(TAG, "%s: number of IO functions: %d", __func__, card->num_io_functions);
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if (card->num_io_functions == 0) {
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card->is_sdio = 0;
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}
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uint32_t host_ocr = get_host_ocr(card->host.io_voltage);
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host_ocr &= card->ocr;
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err = sdmmc_io_send_op_cond(card, host_ocr, &card->ocr);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_io_send_op_cond (1) returned 0x%x", __func__, err);
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return err;
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}
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err = sdmmc_io_enable_int(card);
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if (err != ESP_OK) {
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ESP_LOGD(TAG, "%s: sdmmc_enable_int failed (0x%x)", __func__, 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_init_io_bus_width(sdmmc_card_t* card)
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{
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esp_err_t err;
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card->log_bus_width = 0;
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if (card->host.flags & SDMMC_HOST_FLAG_4BIT) {
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uint8_t card_cap = 0;
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err = sdmmc_io_rw_direct(card, 0, SD_IO_CCCR_CARD_CAP,
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SD_ARG_CMD52_READ, &card_cap);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_io_rw_direct (read SD_IO_CCCR_CARD_CAP) returned 0x%0x", __func__, err);
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return err;
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}
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ESP_LOGD(TAG, "IO card capabilities byte: %02x", card_cap);
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if (!(card_cap & CCCR_CARD_CAP_LSC) ||
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(card_cap & CCCR_CARD_CAP_4BLS)) {
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// This card supports 4-bit bus mode
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uint8_t bus_width = CCCR_BUS_WIDTH_4;
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err = sdmmc_io_rw_direct(card, 0, SD_IO_CCCR_BUS_WIDTH,
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SD_ARG_CMD52_WRITE, &bus_width);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_io_rw_direct (write SD_IO_CCCR_BUS_WIDTH) returned 0x%0x", __func__, err);
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return err;
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}
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card->log_bus_width = 2;
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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_io_enable_hs_mode(sdmmc_card_t* card)
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{
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card->max_freq_khz = SDMMC_FREQ_DEFAULT;
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if (card->host.max_freq_khz <= card->max_freq_khz) {
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/* Host is configured to use low frequency, don't attempt to switch */
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card->max_freq_khz = card->host.max_freq_khz;
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return ESP_OK;
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}
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/* For IO cards, do write + read operation on "High Speed" register,
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* setting EHS bit. If both EHS and SHS read back as set, then HS mode
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* has been enabled.
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*/
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uint8_t val = CCCR_HIGHSPEED_ENABLE;
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esp_err_t err = sdmmc_io_rw_direct(card, 0, SD_IO_CCCR_HIGHSPEED,
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SD_ARG_CMD52_WRITE | SD_ARG_CMD52_EXCHANGE, &val);
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if (err != ESP_OK) {
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ESP_LOGD(TAG, "%s: sdmmc_io_rw_direct returned 0x%x", __func__, err);
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return err;
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}
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ESP_LOGD(TAG, "%s: CCCR_HIGHSPEED=0x%02x", __func__, val);
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const uint8_t hs_mask = CCCR_HIGHSPEED_ENABLE | CCCR_HIGHSPEED_SUPPORT;
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if ((val & hs_mask) != hs_mask) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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card->max_freq_khz = SDMMC_FREQ_HIGHSPEED;
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return ESP_OK;
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}
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esp_err_t sdmmc_io_send_op_cond(sdmmc_card_t* card, uint32_t ocr, uint32_t *ocrp)
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{
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esp_err_t err = ESP_OK;
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sdmmc_command_t cmd = {
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.flags = SCF_CMD_BCR | SCF_RSP_R4,
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.arg = ocr,
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.opcode = SD_IO_SEND_OP_COND
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};
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for (size_t i = 0; i < 100; i++) {
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err = sdmmc_send_cmd(card, &cmd);
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if (err != ESP_OK) {
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break;
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}
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if ((MMC_R4(cmd.response) & SD_IO_OCR_MEM_READY) ||
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ocr == 0) {
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break;
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}
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err = ESP_ERR_TIMEOUT;
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vTaskDelay(SDMMC_IO_SEND_OP_COND_DELAY_MS / portTICK_PERIOD_MS);
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}
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if (err == ESP_OK && ocrp != NULL)
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*ocrp = MMC_R4(cmd.response);
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return err;
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}
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esp_err_t sdmmc_io_rw_direct(sdmmc_card_t* card, int func,
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uint32_t reg, uint32_t arg, uint8_t *byte)
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{
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esp_err_t err;
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sdmmc_command_t cmd = {
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.flags = SCF_CMD_AC | SCF_RSP_R5,
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.arg = 0,
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.opcode = SD_IO_RW_DIRECT
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};
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arg |= (func & SD_ARG_CMD52_FUNC_MASK) << SD_ARG_CMD52_FUNC_SHIFT;
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arg |= (reg & SD_ARG_CMD52_REG_MASK) << SD_ARG_CMD52_REG_SHIFT;
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arg |= (*byte & SD_ARG_CMD52_DATA_MASK) << SD_ARG_CMD52_DATA_SHIFT;
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cmd.arg = arg;
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err = sdmmc_send_cmd(card, &cmd);
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if (err != ESP_OK) {
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ESP_LOGV(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
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return err;
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}
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*byte = SD_R5_DATA(cmd.response);
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return ESP_OK;
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}
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esp_err_t sdmmc_io_read_byte(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, uint8_t *out_byte)
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{
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esp_err_t ret = sdmmc_io_rw_direct(card, function, addr, SD_ARG_CMD52_READ, out_byte);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_io_rw_direct (read 0x%x) returned 0x%x", __func__, addr, ret);
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}
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return ret;
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}
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esp_err_t sdmmc_io_write_byte(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, uint8_t in_byte, uint8_t* out_byte)
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{
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uint8_t tmp_byte = in_byte;
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esp_err_t ret = sdmmc_io_rw_direct(card, function, addr,
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SD_ARG_CMD52_WRITE | SD_ARG_CMD52_EXCHANGE, &tmp_byte);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_io_rw_direct (write 0x%x) returned 0x%x", __func__, addr, ret);
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return ret;
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}
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if (out_byte != NULL) {
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*out_byte = tmp_byte;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_io_rw_extended(sdmmc_card_t* card, int func,
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uint32_t reg, int arg, void *datap, size_t datalen)
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{
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esp_err_t err;
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const size_t max_byte_transfer_size = 512;
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sdmmc_command_t cmd = {
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.flags = SCF_CMD_AC | SCF_RSP_R5,
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.arg = 0,
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.opcode = SD_IO_RW_EXTENDED,
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.data = datap,
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.datalen = datalen,
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.blklen = max_byte_transfer_size /* TODO: read max block size from CIS */
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};
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uint32_t count; /* number of bytes or blocks, depending on transfer mode */
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if (arg & SD_ARG_CMD53_BLOCK_MODE) {
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if (cmd.datalen % cmd.blklen != 0) {
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return ESP_ERR_INVALID_SIZE;
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}
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count = cmd.datalen / cmd.blklen;
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} else {
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if (datalen > max_byte_transfer_size) {
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/* TODO: split into multiple operations? */
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return ESP_ERR_INVALID_SIZE;
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}
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if (datalen == max_byte_transfer_size) {
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count = 0; // See 5.3.1 SDIO simplifed spec
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} else {
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count = datalen;
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}
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cmd.blklen = datalen;
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}
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arg |= (func & SD_ARG_CMD53_FUNC_MASK) << SD_ARG_CMD53_FUNC_SHIFT;
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arg |= (reg & SD_ARG_CMD53_REG_MASK) << SD_ARG_CMD53_REG_SHIFT;
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arg |= (count & SD_ARG_CMD53_LENGTH_MASK) << SD_ARG_CMD53_LENGTH_SHIFT;
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cmd.arg = arg;
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if ((arg & SD_ARG_CMD53_WRITE) == 0) {
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cmd.flags |= SCF_CMD_READ;
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}
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err = sdmmc_send_cmd(card, &cmd);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
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return err;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_io_read_bytes(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, void* dst, size_t size)
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{
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/* host quirk: SDIO transfer with length not divisible by 4 bytes
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* has to be split into two transfers: one with aligned length,
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* the other one for the remaining 1-3 bytes.
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*/
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uint8_t *pc_dst = dst;
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while (size > 0) {
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size_t size_aligned = size & (~3);
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size_t will_transfer = size_aligned > 0 ? size_aligned : size;
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esp_err_t err = sdmmc_io_rw_extended(card, function, addr,
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SD_ARG_CMD53_READ | SD_ARG_CMD53_INCREMENT,
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pc_dst, will_transfer);
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if (err != ESP_OK) {
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return err;
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}
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pc_dst += will_transfer;
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size -= will_transfer;
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addr += will_transfer;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_io_write_bytes(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, const void* src, size_t size)
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{
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/* same host quirk as in sdmmc_io_read_bytes */
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const uint8_t *pc_src = (const uint8_t*) src;
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while (size > 0) {
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size_t size_aligned = size & (~3);
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size_t will_transfer = size_aligned > 0 ? size_aligned : size;
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esp_err_t err = sdmmc_io_rw_extended(card, function, addr,
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SD_ARG_CMD53_WRITE | SD_ARG_CMD53_INCREMENT,
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(void*) pc_src, will_transfer);
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if (err != ESP_OK) {
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return err;
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}
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pc_src += will_transfer;
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size -= will_transfer;
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addr += will_transfer;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_io_read_blocks(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, void* dst, size_t size)
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{
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if (size % 4 != 0) {
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return ESP_ERR_INVALID_SIZE;
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}
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return sdmmc_io_rw_extended(card, function, addr,
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SD_ARG_CMD53_READ | SD_ARG_CMD53_INCREMENT | SD_ARG_CMD53_BLOCK_MODE,
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dst, size);
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}
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esp_err_t sdmmc_io_write_blocks(sdmmc_card_t* card, uint32_t function,
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uint32_t addr, const void* src, size_t size)
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{
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if (size % 4 != 0) {
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return ESP_ERR_INVALID_SIZE;
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}
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return sdmmc_io_rw_extended(card, function, addr,
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SD_ARG_CMD53_WRITE | SD_ARG_CMD53_INCREMENT | SD_ARG_CMD53_BLOCK_MODE,
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(void*) src, size);
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}
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esp_err_t sdmmc_io_enable_int(sdmmc_card_t* card)
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{
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if (card->host.io_int_enable == NULL) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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return (*card->host.io_int_enable)(card->host.slot);
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}
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esp_err_t sdmmc_io_wait_int(sdmmc_card_t* card, TickType_t timeout_ticks)
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{
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if (card->host.io_int_wait == NULL) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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return (*card->host.io_int_wait)(card->host.slot, timeout_ticks);
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}
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