/* * Copyright (c) 2006 Uwe Stuehler * 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 "sdmmc_common.h" static const char* TAG = "sdmmc_common"; esp_err_t sdmmc_init_ocr(sdmmc_card_t* card) { esp_err_t err; /* In SPI mode, READ_OCR (CMD58) command is used to figure out which voltage * ranges the card can support. This step is skipped since 1.8V isn't * supported on the ESP32. */ uint32_t host_ocr = get_host_ocr(card->host.io_voltage); if ((card->ocr & SD_OCR_SDHC_CAP) != 0) { host_ocr |= SD_OCR_SDHC_CAP; } /* Send SEND_OP_COND (ACMD41) command to the card until it becomes ready. */ err = sdmmc_send_cmd_send_op_cond(card, host_ocr, &card->ocr); /* If time-out, re-try send_op_cond as MMC */ if (err == ESP_ERR_TIMEOUT && !host_is_spi(card)) { ESP_LOGD(TAG, "send_op_cond timeout, trying MMC"); card->is_mmc = 1; err = sdmmc_send_cmd_send_op_cond(card, host_ocr, &card->ocr); } if (err != ESP_OK) { ESP_LOGE(TAG, "%s: send_op_cond (1) returned 0x%x", __func__, err); return err; } if (host_is_spi(card)) { err = sdmmc_send_cmd_read_ocr(card, &card->ocr); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: read_ocr returned 0x%x", __func__, err); return err; } } ESP_LOGD(TAG, "host_ocr=0x%x card_ocr=0x%x", host_ocr, card->ocr); /* Clear all voltage bits in host's OCR which the card doesn't support. * Don't touch CCS bit because in SPI mode cards don't report CCS in ACMD41 * response. */ host_ocr &= (card->ocr | (~SD_OCR_VOL_MASK)); ESP_LOGD(TAG, "sdmmc_card_init: host_ocr=%08x, card_ocr=%08x", host_ocr, card->ocr); return ESP_OK; } esp_err_t sdmmc_init_cid(sdmmc_card_t* card) { esp_err_t err; sdmmc_csd_t csd; sdmmc_response_t raw_cid; if (!host_is_spi(card)) { if (card->is_mem) { err = sdmmc_send_cmd_all_send_cid(card, &raw_cid); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: all_send_cid returned 0x%x", __func__, err); return err; } } err = sdmmc_send_cmd_set_relative_addr(card, &card->rca); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: set_relative_addr returned 0x%x", __func__, err); return err; } if (card->is_mmc) { /* For MMC, need to know CSD to decode CID. * But CSD can only be read in data transfer mode, * and it is not possible to read CID in data transfer mode. * Luckily at this point the RCA is set and the card is in data * transfer mode, so we can get its CSD to decode the CID... */ err = sdmmc_send_cmd_send_csd(card, &csd); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err); return err; } err = sdmmc_mmc_decode_cid(csd.mmc_ver, raw_cid, &card->cid); } else { err = sdmmc_decode_cid(raw_cid, &card->cid); } if (err != ESP_OK) { ESP_LOGE(TAG, "%s: decoding CID failed (0x%x)", __func__, err); return err; } } else { err = sdmmc_send_cmd_send_cid(card, &card->cid); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: send_cid returned 0x%x", __func__, err); return err; } } return ESP_OK; } esp_err_t sdmmc_init_csd(sdmmc_card_t* card) { assert(card->is_mem == 1); /* Get and decode the contents of CSD register. Determine card capacity. */ esp_err_t err = sdmmc_send_cmd_send_csd(card, &card->csd); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err); return err; } const size_t max_sdsc_capacity = UINT32_MAX / card->csd.sector_size + 1; if (!(card->ocr & SD_OCR_SDHC_CAP) && card->csd.capacity > max_sdsc_capacity) { ESP_LOGW(TAG, "%s: SDSC card reports capacity=%u. Limiting to %u.", __func__, card->csd.capacity, max_sdsc_capacity); card->csd.capacity = max_sdsc_capacity; } return ESP_OK; } esp_err_t sdmmc_init_select_card(sdmmc_card_t* card) { assert(!host_is_spi(card)); esp_err_t err = sdmmc_send_cmd_select_card(card, card->rca); if (err != ESP_OK) { ESP_LOGE(TAG, "%s: select_card returned 0x%x", __func__, err); return err; } return ESP_OK; } esp_err_t sdmmc_init_card_hs_mode(sdmmc_card_t* card) { esp_err_t err = ESP_ERR_NOT_SUPPORTED; if (card->is_mem && !card->is_mmc) { err = sdmmc_enable_hs_mode_and_check(card); } else if (card->is_sdio) { err = sdmmc_io_enable_hs_mode(card); } else if (card->is_mmc){ err = sdmmc_mmc_enable_hs_mode(card); } if (err == ESP_ERR_NOT_SUPPORTED) { ESP_LOGD(TAG, "%s: host supports HS mode, but card doesn't", __func__); card->max_freq_khz = SDMMC_FREQ_DEFAULT; } else if (err != ESP_OK) { return err; } return ESP_OK; } esp_err_t sdmmc_init_host_bus_width(sdmmc_card_t* card) { int bus_width = 1; if ((card->host.flags & SDMMC_HOST_FLAG_4BIT) && (card->log_bus_width == 2)) { bus_width = 4; } else if ((card->host.flags & SDMMC_HOST_FLAG_8BIT) && (card->log_bus_width == 3)) { bus_width = 8; } ESP_LOGD(TAG, "%s: using %d-bit bus", __func__, bus_width); if (bus_width > 1) { esp_err_t err = (*card->host.set_bus_width)(card->host.slot, bus_width); if (err != ESP_OK) { ESP_LOGE(TAG, "host.set_bus_width failed (0x%x)", err); return err; } } return ESP_OK; } esp_err_t sdmmc_init_host_frequency(sdmmc_card_t* card) { assert(card->max_freq_khz <= card->host.max_freq_khz); /* Find highest frequency in the following list, * which is below card->max_freq_khz. */ const uint32_t freq_values[] = { SDMMC_FREQ_52M, SDMMC_FREQ_HIGHSPEED, SDMMC_FREQ_26M, SDMMC_FREQ_DEFAULT }; const int n_freq_values = sizeof(freq_values) / sizeof(freq_values[0]); uint32_t selected_freq = SDMMC_FREQ_PROBING; for (int i = 0; i < n_freq_values; ++i) { uint32_t freq = freq_values[i]; if (card->max_freq_khz >= freq) { selected_freq = freq; break; } } ESP_LOGD(TAG, "%s: using %d kHz bus frequency", __func__, selected_freq); if (selected_freq > SDMMC_FREQ_PROBING) { esp_err_t err = (*card->host.set_card_clk)(card->host.slot, selected_freq); if (err != ESP_OK) { ESP_LOGE(TAG, "failed to switch bus frequency (0x%x)", err); return err; } } if (card->is_ddr) { if (card->host.set_bus_ddr_mode == NULL) { ESP_LOGE(TAG, "host doesn't support DDR mode or voltage switching"); return ESP_ERR_NOT_SUPPORTED; } esp_err_t err = (*card->host.set_bus_ddr_mode)(card->host.slot, true); if (err != ESP_OK) { ESP_LOGE(TAG, "failed to switch bus to DDR mode (0x%x)", err); return err; } } return ESP_OK; } void sdmmc_flip_byte_order(uint32_t* response, size_t size) { assert(size % (2 * sizeof(uint32_t)) == 0); const size_t n_words = size / sizeof(uint32_t); for (int i = 0; i < n_words / 2; ++i) { uint32_t left = __builtin_bswap32(response[i]); uint32_t right = __builtin_bswap32(response[n_words - i - 1]); response[i] = right; response[n_words - i - 1] = left; } } void sdmmc_card_print_info(FILE* stream, const sdmmc_card_t* card) { bool print_scr = false; bool print_csd = false; const char* type; fprintf(stream, "Name: %s\n", card->cid.name); if (card->is_sdio) { type = "SDIO"; print_scr = true; print_csd = true; } else if (card->is_mmc) { type = "MMC"; print_csd = true; } else { type = (card->ocr & SD_OCR_SDHC_CAP) ? "SDHC/SDXC" : "SDSC"; } fprintf(stream, "Type: %s\n", type); if (card->max_freq_khz < 1000) { fprintf(stream, "Speed: %d kHz\n", card->max_freq_khz); } else { fprintf(stream, "Speed: %d MHz%s\n", card->max_freq_khz / 1000, card->is_ddr ? ", DDR" : ""); } fprintf(stream, "Size: %lluMB\n", ((uint64_t) card->csd.capacity) * card->csd.sector_size / (1024 * 1024)); if (print_csd) { fprintf(stream, "CSD: ver=%d, sector_size=%d, capacity=%d read_bl_len=%d\n", card->csd.csd_ver, card->csd.sector_size, card->csd.capacity, card->csd.read_block_len); } if (print_scr) { fprintf(stream, "SCR: sd_spec=%d, bus_width=%d\n", card->scr.sd_spec, card->scr.bus_width); } } esp_err_t sdmmc_fix_host_flags(sdmmc_card_t* card) { const uint32_t width_1bit = SDMMC_HOST_FLAG_1BIT; const uint32_t width_4bit = SDMMC_HOST_FLAG_4BIT; const uint32_t width_8bit = SDMMC_HOST_FLAG_8BIT; const uint32_t width_mask = width_1bit | width_4bit | width_8bit; int slot_bit_width = card->host.get_bus_width(card->host.slot); if (slot_bit_width == 1 && (card->host.flags & (width_4bit | width_8bit))) { card->host.flags &= ~width_mask; card->host.flags |= width_1bit; } else if (slot_bit_width == 4 && (card->host.flags & width_8bit)) { if ((card->host.flags & width_4bit) == 0) { ESP_LOGW(TAG, "slot width set to 4, but host flags don't have 4 line mode enabled; using 1 line mode"); card->host.flags &= ~width_mask; card->host.flags |= width_1bit; } else { card->host.flags &= ~width_mask; card->host.flags |= width_4bit; } } return ESP_OK; }