// license:BSD-3-Clause // copyright-holders:R. Belmont /* SD Card emulation, SPI interface. Emulation by R. Belmont This emulates either an SDHC (SPI_SDCARD) or an SDV2 card (SPI_SDCARDV2). SDHC has a fixed 512 byte block size and the arguments to the read/write commands are block numbers. SDV2 has a variable block size defaulting to 512 and the arguments to the read/write commands are byte offsets. The block size set with CMD16 must match the underlying CHD block size if it's not 512. Adding the native 4-bit-wide SD interface is also possible; this should be broken up into a base SD Card class with SPI and SD frontends in that case. Multiple block read/write commands are not supported but would be straightforward to add. References: https://www.sdcard.org/downloads/pls/ (Physical Layer Simplified Specification) REF: tags are referring to the spec form above. 'Physical Layer Simplified Specification v8.00' http://www.dejazzer.com/ee379/lecture_notes/lec12_sd_card.pdf https://embdev.net/attachment/39390/TOSHIBA_SD_Card_Specification.pdf http://elm-chan.org/docs/mmc/mmc_e.html */ #include "emu.h" #include "spi_sdcard.h" #include "imagedev/harddriv.h" #include "multibyte.h" #include #define LOG_COMMAND (1U << 1) #define LOG_SPI (1U << 2) //#define VERBOSE (LOG_GENERAL | LOG_COMMAND) //#define LOG_OUTPUT_FUNC osd_printf_info #include "logmacro.h" namespace { constexpr u8 DATA_RESPONSE_OK = 0x05; constexpr u8 DATA_RESPONSE_IO_ERROR = 0x0d; enum { CSD_STRUCTURE_V10 = 0x0, CSD_STRUCTURE_V20 = 0x1, TAAC_UNIT_1NS = 0x00, TAAC_UNIT_10NS = 0x01, TAAC_UNIT_100NS = 0x02, TAAC_UNIT_1US = 0x03, TAAC_UNIT_10US = 0x04, TAAC_UNIT_100US = 0x05, TAAC_UNIT_1MS = 0x06, TAAC_UNIT_10MS = 0x07, TAAC_VALUE_1_0 = 0x08, TAAC_VALUE_1_2 = 0x10, TAAC_VALUE_1_3 = 0x18, TAAC_VALUE_1_5 = 0x20, TAAC_VALUE_2_0 = 0x28, TAAC_VALUE_2_5 = 0x30, TAAC_VALUE_3_0 = 0x38, TAAC_VALUE_3_5 = 0x40, TAAC_VALUE_4_0 = 0x48, TAAC_VALUE_4_5 = 0x50, TAAC_VALUE_5_0 = 0x58, TAAC_VALUE_5_5 = 0x60, TAAC_VALUE_6_0 = 0x68, TAAC_VALUE_7_0 = 0x70, TAAC_VALUE_8_0 = 0x78, TRAN_SPEED_UNIT_100K = 0x00, TRAN_SPEED_UNIT_1M = 0x01, TRAN_SPEED_UNIT_10M = 0x02, TRAN_SPEED_UNIT_100M = 0x03, TRAN_SPEED_VALUE_1_0 = 0x08, TRAN_SPEED_VALUE_1_2 = 0x10, TRAN_SPEED_VALUE_1_3 = 0x18, TRAN_SPEED_VALUE_1_5 = 0x20, TRAN_SPEED_VALUE_2_0 = 0x28, TRAN_SPEED_VALUE_2_5 = 0x30, TRAN_SPEED_VALUE_3_0 = 0x38, TRAN_SPEED_VALUE_3_5 = 0x40, TRAN_SPEED_VALUE_4_0 = 0x48, TRAN_SPEED_VALUE_4_5 = 0x50, TRAN_SPEED_VALUE_5_0 = 0x58, TRAN_SPEED_VALUE_5_5 = 0x60, TRAN_SPEED_VALUE_6_0 = 0x68, TRAN_SPEED_VALUE_7_0 = 0x70, TRAN_SPEED_VALUE_8_0 = 0x78, VDD_CURR_MIN_0_5MA = 0x00, VDD_CURR_MIN_1MA = 0x01, VDD_CURR_MIN_5MA = 0x02, VDD_CURR_MIN_10MA = 0x03, VDD_CURR_MIN_25MA = 0x04, VDD_CURR_MIN_35MA = 0x05, VDD_CURR_MIN_60MA = 0x06, VDD_CURR_MIN_100MA = 0x07, VDD_CURR_MAX_1MA = 0x00, VDD_CURR_MAX_5MA = 0x01, VDD_CURR_MAX_10MA = 0x02, VDD_CURR_MAX_25MA = 0x03, VDD_CURR_MAX_35MA = 0x04, VDD_CURR_MAX_45MA = 0x05, VDD_CURR_MAX_80MA = 0x06, VDD_CURR_MAX_200MA = 0x07 }; } // anonymous namespace enum spi_sdcard_device::sd_state : u8 { //REF Table 4-1:Overview of Card States vs. Operation Mode SD_STATE_IDLE = 0, SD_STATE_READY, SD_STATE_IDENT, SD_STATE_STBY, SD_STATE_TRAN, SD_STATE_DATA, SD_STATE_DATA_MULTI, // synthetical state for this implementation SD_STATE_RCV, SD_STATE_PRG, SD_STATE_DIS, SD_STATE_INA, //FIXME Existing states which must be revisited SD_STATE_WRITE_WAITFE, SD_STATE_WRITE_DATA }; ALLOW_SAVE_TYPE(spi_sdcard_device::sd_state); DEFINE_DEVICE_TYPE(SPI_SDCARD, spi_sdcard_device, "spi_sdcard", "SD Card (SPI interface)") spi_sdcard_device::spi_sdcard_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : spi_sdcard_device(mconfig, SPI_SDCARD, tag, owner, clock) { } spi_sdcard_device::spi_sdcard_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, type, tag, owner, clock), write_miso(*this), m_image(*this, "image"), m_preferred_type(SD_TYPE_V2), m_blksize(512), m_type(SD_TYPE_V2), m_state(SD_STATE_IDLE), m_ss(0), m_in_bit(0), m_clk_state(0), m_in_latch(0), m_out_latch(0xff), m_cur_bit(0), m_out_delay(0), m_out_count(0), m_out_ptr(0), m_write_ptr(0), m_xferblk(512), m_blknext(0), m_crc_off(true), m_bACMD(false) { std::fill(std::begin(m_csd), std::end(m_csd), 0); std::fill(std::begin(m_cmd), std::end(m_cmd), 0xff); } spi_sdcard_device::~spi_sdcard_device() { } void spi_sdcard_device::device_start() { m_data = make_unique_clear(2048 + 8); save_pointer(NAME(m_data), 2048 + 8); save_item(NAME(m_cmd)); save_item(NAME(m_state)); save_item(NAME(m_ss)); save_item(NAME(m_in_bit)); save_item(NAME(m_clk_state)); save_item(NAME(m_in_latch)); save_item(NAME(m_out_latch)); save_item(NAME(m_cur_bit)); save_item(NAME(m_out_delay)); save_item(NAME(m_out_count)); save_item(NAME(m_out_ptr)); save_item(NAME(m_write_ptr)); save_item(NAME(m_xferblk)); save_item(NAME(m_blknext)); save_item(NAME(m_crc_off)); save_item(NAME(m_bACMD)); } std::error_condition spi_sdcard_device::image_loaded(device_image_interface &image) { // need block size and total blocks to create CSD auto const info = m_image->get_info(); u64 const total_blocks = u64(info.cylinders) * info.heads * info.sectors; if (!total_blocks) { osd_printf_error("%s: SD Card cannot mount a zero-block image\n", tag()); return image_error::INVALIDIMAGE; } // ensure block size can be expressed in the CSD if ((info.sectorbytes & (info.sectorbytes - 1)) || !info.sectorbytes || (512 > info.sectorbytes) || (2048 < info.sectorbytes)) { osd_printf_error("%s: SD Card cannot use sector size %u (must be a power of 2 from 512 to 2048)\n", tag()); return image_error::INVALIDIMAGE; } u8 block_size_exp = 0; for (auto i = info.sectorbytes; !BIT(i, 0); i >>= 1) ++block_size_exp; // see how we can express the total block count u64 total_mant = total_blocks; u8 total_exp = 0; while (!BIT(total_mant, 0)) { total_mant >>= 1; ++total_exp; } bool const sd_ok = (2 <= total_exp) && ((1 << 12) >= (total_mant << ((9 < total_exp) ? (total_exp - 9) : 0))); bool const sdhc_ok = (512 == info.sectorbytes) && (10 <= total_exp) && ((u32(1) << 16) >= (total_mant << (total_exp - 10))); if (!sd_ok && !sdhc_ok) { osd_printf_error("%s: SD Card image size %u blocks of %u bytes is not supported by SD or SDHC\n", tag(), total_blocks, info.sectorbytes); return image_error::INVALIDIMAGE; } try { m_sectorbuf.resize(info.sectorbytes); } catch (std::bad_alloc const &) { osd_printf_error("%s: Error allocating %u-byte SD Card sector buffer\n", tag(), info.sectorbytes); return std::errc::not_enough_memory; } m_blksize = m_xferblk = info.sectorbytes; m_crc_off = true; // set up common CSD fields m_csd[0] = 0x00; // 127: CSD_STRUCTURE:2 (00b) 0:6 m_csd[1] = 0x00; // 119: TAAC:8 m_csd[2] = 0x00; // 111: NSAC:8 m_csd[3] = TRAN_SPEED_UNIT_10M | TRAN_SPEED_VALUE_2_5; // 103: TRAN_SPEED:8 (32h for 25MHz or 5Ah for 50MHz) m_csd[4] = 0x5b; // 95: CCC:12 (01x110110101b) m_csd[5] = 0x50; // .. READ_BL_LN:4 m_csd[5] |= block_size_exp; m_csd[6] = 0x00; // 79: READ_BL_PARTIAL:1 WRITE_BLK_MISALIGN:1 READ_BLK_MISALIGN:1 DSR_IMP:1 0:2 C_SIZE:12 m_csd[7] = 0x00; // .. m_csd[8] = 0x00; // .. VDD_R_CURR_MIN:3 VDD_R_CURR_MAX:3 m_csd[9] = 0x00; // 55: VDD_W_CURR_MIN:3 VDD_W_CURR_MAX:3 C_SIZE_MUL:3 m_csd[10] = 0x3f; // .. ERASE_BLK_EN:1 SECTOR_SIZE:7 m_csd[11] = 0x80; // .. WP_GRP_SIZE:7 m_csd[12] = 0x04; // 31: WP_GRP_ENABLE:1 0:2 R2W_FACTOR:3 WRITE_BL_LEN:4 m_csd[12] |= BIT(block_size_exp, 2, 2); m_csd[13] = 0x00; // .. WRITE_BL_PARTIAL:1 0:5 m_csd[13] |= BIT(block_size_exp, 0, 2) << 6; m_csd[14] = 0x00; // 15: FILE_FORMAT_GRP:1 COPY:1 PERM_WRITE_PROTECT:1 TMP_WRITE_PROTECT:1 FILE_FORMAT:2 WP_UPC:1 0:1 m_csd[15] = 0x01; // 7: CRC7 1:1 if (sdhc_ok && ((SD_TYPE_HC == m_preferred_type) || !sd_ok)) { u32 const c_size = (total_blocks >> 10) - 1; osd_printf_verbose( "%s: SD Card image mounted as SDHC, %u blocks of %u bytes, device size ((%u + 1) << 10) * (1 << %u)\n", tag(), total_blocks, info.sectorbytes, c_size, block_size_exp); m_type = SD_TYPE_HC; // set up CSD Version 2.0 m_csd[0] |= CSD_STRUCTURE_V20 << 6; // 127: CSD_STRUCTURE:2 (00b) 0:6 m_csd[1] = TAAC_UNIT_1MS | TAAC_VALUE_1_0; // 119: TAAC:8 m_csd[7] |= BIT(c_size, 16, 6); // .. C_SIZE:22 m_csd[8] |= BIT(c_size, 8, 8); // .. m_csd[9] |= BIT(c_size, 0, 8); // .. } else { u8 const c_size_mult = std::min(total_exp, 9) - 2; u16 const c_size = (total_blocks >> (c_size_mult + 2)) - 1; osd_printf_verbose( "%s: SD Card image mounted as SD, %u blocks of %u bytes, device size ((%u + 1) << (%u + 2)) * (1 << %u)\n", tag(), total_blocks, info.sectorbytes, c_size, c_size_mult, block_size_exp); m_type = SD_TYPE_V2; // set up CSD Version 1.0 m_csd[0] |= CSD_STRUCTURE_V10 << 6; // 127: CSD_STRUCTURE:2 (00b) 0:6 m_csd[1] = TAAC_UNIT_1MS | TAAC_VALUE_1_5; // 119: TAAC:8 m_csd[6] |= 0x80; // 79: READ_BL_PARTIAL:1 WRITE_BLK_MISALIGN:1 READ_BLK_MISALIGN:1 DSR_IMP:1 0:2 C_SIZE:12 m_csd[6] |= BIT(c_size, 10, 2); m_csd[7] |= BIT(c_size, 2, 8); // .. m_csd[8] |= BIT(c_size, 0, 2) << 6; // .. VDD_R_CURR_MIN:3 VDD_R_CURR_MAX:3 m_csd[8] |= VDD_CURR_MIN_100MA << 3; m_csd[8] |= VDD_CURR_MAX_80MA; m_csd[9] |= VDD_CURR_MIN_100MA << 5; // 55: VDD_W_CURR_MIN:3 VDD_W_CURR_MAX:3 C_SIZE_MUL:3 m_csd[9] |= VDD_CURR_MAX_80MA << 2; m_csd[9] |= BIT(c_size_mult, 1, 2); m_csd[10] |= BIT(c_size_mult, 0, 1) << 7; // .. ERASE_BLK_EN:1 SECTOR_SIZE:7 m_csd[11] |= 0x3f; // .. WP_GRP_SIZE:7 } // TODO: calculate CRC7 LOG("Generated CSD %016x%016x\n", get_u64be(&m_csd[0]), get_u64be(&m_csd[8])); return std::error_condition(); } void spi_sdcard_device::image_unloaded(device_image_interface &image) { std::fill(std::begin(m_csd), std::end(m_csd), 0); } void spi_sdcard_device::device_add_mconfig(machine_config &config) { HARDDISK(config, m_image).set_interface("sdcard"); m_image->set_device_load(FUNC(spi_sdcard_device::image_loaded)); m_image->set_device_unload(FUNC(spi_sdcard_device::image_unloaded)); } void spi_sdcard_device::send_data(u16 count, sd_state new_state, u8 delay) { m_out_delay = delay; m_out_ptr = 0; m_out_count = count; change_state(new_state); } void spi_sdcard_device::spi_clock_w(int state) { // only respond if selected, and a clock edge if (m_ss && state != m_clk_state) { // We implement SPI Mode 3 signalling, in which we latch the data on // rising clock edges, and shift the data on falling clock edges. // See http://www.dejazzer.com/ee379/lecture_notes/lec12_sd_card.pdf for details // on the 4 SPI signalling modes. SD Cards can work in either Mode 0 or Mode 3, // both of which shift on the falling edge and latch on the rising edge but // have opposite CLK polarity. if (state) latch_in(); else shift_out(); } m_clk_state = state; } void spi_sdcard_device::spi_ss_w(int state) { if (!m_ss && state) { LOGMASKED(LOG_SPI, "SDCARD: selected\n"); std::fill(std::begin(m_cmd), std::end(m_cmd), 0xff); m_state = SD_STATE_IDLE; m_in_latch = 0; m_cur_bit = 0; m_out_latch = 0xff; m_out_delay = 0; m_out_count = 0; } else if (m_ss && !state) { LOGMASKED(LOG_SPI, "SDCARD: deselected\n"); } m_ss = state; } void spi_sdcard_device::latch_in() { m_in_latch &= ~0x01; m_in_latch |= m_in_bit; LOGMASKED(LOG_SPI, "\tsdcard: L %02x (%d) (out %02x)\n", m_in_latch, m_cur_bit, m_out_latch); m_cur_bit++; if (m_cur_bit == 8) { LOGMASKED(LOG_SPI, "SDCARD: got %02x\n", m_in_latch); if (m_state == SD_STATE_WRITE_WAITFE) { if (m_in_latch == 0xfe) { m_state = SD_STATE_WRITE_DATA; m_out_latch = 0xff; m_write_ptr = 0; } } else if (m_state == SD_STATE_WRITE_DATA) { m_data[m_write_ptr++] = m_in_latch; if (m_write_ptr == (m_xferblk + 2)) { LOG("writing LBA %x, data %02x %02x %02x %02x\n", m_blknext, m_data[0], m_data[1], m_data[2], m_data[3]); // TODO: this is supposed to be a CRC response, the actual write will take some time if (m_image->write(m_blknext, &m_data[0])) { m_data[0] = DATA_RESPONSE_OK; } else { m_data[0] = DATA_RESPONSE_IO_ERROR; } m_data[1] = 0x01; send_data(2, SD_STATE_IDLE, 0); // zero delay - must immediately follow the data } } else // receive CMD { std::memmove(m_cmd, m_cmd + 1, 5); m_cmd[5] = m_in_latch; if (m_state == SD_STATE_DATA_MULTI) { do_command(); if (m_state == SD_STATE_DATA_MULTI && m_out_count == 0) { // FIXME: support multi-block read when transfer size is smaller than block size m_data[0] = 0xfe; // data token m_image->read(m_blknext++, &m_data[1]); util::crc16_t crc16 = util::crc16_creator::simple(&m_data[1], m_blksize); put_u16be(&m_data[m_blksize + 1], crc16); LOG("reading LBA %x: [0] %02x %02x .. [%d] %02x %02x [crc16] %04x\n", m_blknext - 1, m_data[1], m_data[2], m_blksize - 2, m_data[m_blksize - 1], m_data[m_blksize], crc16); send_data(1 + m_blksize + 2, SD_STATE_DATA_MULTI); } } else if ((m_state == SD_STATE_IDLE) || (((m_cmd[0] & 0x70) == 0x40) || (m_out_count == 0))) // CMD0 - GO_IDLE_STATE { do_command(); } } } } void spi_sdcard_device::shift_out() { m_in_latch <<= 1; m_out_latch <<= 1; m_out_latch |= 1; LOGMASKED(LOG_SPI, "\tsdcard: S %02x %02x (%d)\n", m_in_latch, m_out_latch, m_cur_bit); m_cur_bit &= 0x07; if (m_cur_bit == 0) { if (m_out_ptr < m_out_delay) { m_out_ptr++; } else if (m_out_count > 0) { m_out_latch = m_data[m_out_ptr - m_out_delay]; m_out_ptr++; LOGMASKED(LOG_SPI, "SDCARD: latching %02x (start of shift)\n", m_out_latch); m_out_count--; } } write_miso(BIT(m_out_latch, 7)); } void spi_sdcard_device::do_command() { if (((m_cmd[0] & 0xc0) == 0x40) && ((m_cmd[5] & 1) || m_crc_off)) { LOGMASKED(LOG_COMMAND, "SDCARD: cmd %02d %02x %02x %02x %02x %02x\n", m_cmd[0] & 0x3f, m_cmd[1], m_cmd[2], m_cmd[3], m_cmd[4], m_cmd[5]); bool clean_cmd = true; switch (m_cmd[0] & 0x3f) { case 0: // CMD0 - GO_IDLE_STATE if (m_image->exists()) { m_data[0] = 0x01; send_data(1, SD_STATE_IDLE); } else { m_data[0] = 0x00; send_data(1, SD_STATE_INA); } break; case 1: // CMD1 - SEND_OP_COND m_data[0] = 0x00; send_data(1, SD_STATE_READY); break; case 8: // CMD8 - SEND_IF_COND (SD v2 only) m_data[0] = 0x01; m_data[1] = 0; m_data[2] = 0; m_data[3] = 0x01; m_data[4] = 0xaa; send_data(5, SD_STATE_IDLE); break; case 9: // CMD9 - SEND_CSD m_data[0] = 0x00; m_data[1] = 0xff; m_data[2] = 0xfe; std::copy(std::begin(m_csd), std::end(m_csd), &m_data[3]); send_data(3 + std::size(m_csd), SD_STATE_STBY); break; case 10: // CMD10 - SEND_CID m_data[0] = 0x00; // initial R1 response m_data[1] = 0xff; // throwaway byte before data transfer m_data[2] = 0xfe; // data token m_data[3] = 'M'; // Manufacturer ID - we'll use M for MAME m_data[4] = 'M'; // OEM ID - MD for MAMEdev m_data[5] = 'D'; m_data[6] = 'M'; // Product Name - "MCARD" m_data[7] = 'C'; m_data[8] = 'A'; m_data[9] = 'R'; m_data[10] = 'D'; m_data[11] = 0x10; // Product Revision in BCD (1.0) { u32 uSerial = 0x12345678; put_u32be(&m_data[12], uSerial); // PSN - Product Serial Number } m_data[16] = 0x01; // MDT - Manufacturing Date m_data[17] = 0x59; // 0x15 9 = 2021, September m_data[18] = 0x00; // CRC7, bit 0 is always 0 { util::crc16_t crc16 = util::crc16_creator::simple(&m_data[3], 16); put_u16be(&m_data[19], crc16); } send_data(3 + 16 + 2, SD_STATE_STBY); break; case 12: // CMD12 - STOP_TRANSMISSION m_data[0] = 0; send_data(1, (m_state == SD_STATE_RCV) ? SD_STATE_PRG : SD_STATE_TRAN); break; case 13: // CMD13 - SEND_STATUS m_data[0] = 0; // TODO m_data[1] = 0; send_data(2, SD_STATE_STBY); break; case 16: // CMD16 - SET_BLOCKLEN if (m_image->exists()) { u16 const blocklen = get_u16be(&m_cmd[3]); if (blocklen && ((m_type == SD_TYPE_V2) || (blocklen == m_blksize)) && (blocklen <= m_blksize)) { m_xferblk = blocklen; m_data[0] = 0x00; } else { m_data[0] = 0x40; // parameter error } } else { m_data[0] = 0xff; // show an error } send_data(1, SD_STATE_TRAN); break; case 17: // CMD17 - READ_SINGLE_BLOCK if (m_image->exists()) { m_data[0] = 0x00; // initial R1 response // data token occurs some time after the R1 response. A2SD expects at least 1 // byte of space between R1 and the data packet. m_data[1] = 0xff; m_data[2] = 0xfe; // data token u32 blk = get_u32be(&m_cmd[1]); if ((m_type == SD_TYPE_V2) && ((blk / m_blksize) != ((blk + (m_xferblk - 1)) / m_blksize))) { LOG("rejecting read of %u bytes at %u that crosses %u-byte block boundary\n", m_xferblk, blk, m_blksize); m_data[0] = 0x40; // parameter error send_data(1, SD_STATE_TRAN); } else if (m_xferblk == m_blksize) { // optimise for reading an entire block if (m_type == SD_TYPE_V2) { blk /= m_blksize; } m_image->read(blk, &m_data[3]); util::crc16_t crc16 = util::crc16_creator::simple(&m_data[3], m_xferblk); put_u16be(&m_data[m_xferblk + 3], crc16); LOG("reading LBA %x: [0] %02x %02x .. [%d] %02x %02x [crc16] %04x\n", blk, m_data[3], m_data[4], m_xferblk - 2, m_data[m_xferblk + 1], m_data[m_xferblk + 2], crc16); send_data(3 + m_xferblk + 2, SD_STATE_DATA); } else { assert(m_type == SD_TYPE_V2); m_image->read(blk / m_blksize, &m_sectorbuf[0]); std::copy_n(&m_sectorbuf[blk % m_blksize], m_xferblk, &m_data[3]); util::crc16_t crc16 = util::crc16_creator::simple(&m_data[3], m_xferblk); put_u16be(&m_data[m_xferblk + 3], crc16); LOG("reading LBA %x+%x: [0] %02x %02x .. [%d] %02x %02x [crc16] %04x\n", blk / m_blksize, blk % m_blksize, m_data[3], m_data[4], m_xferblk - 2, m_data[m_xferblk + 1], m_data[m_xferblk + 2], crc16); send_data(3 + m_xferblk + 2, SD_STATE_DATA); } } else { m_data[0] = 0xff; // show an error send_data(1, SD_STATE_TRAN); } break; case 18: // CMD18 - CMD_READ_MULTIPLE_BLOCK if (m_image->exists()) { if (m_xferblk == m_blksize) { m_data[0] = 0x00; // initial R1 response // data token occurs some time after the R1 response. A2SD // expects at least 1 byte of space between R1 and the data // packet. m_blknext = get_u32be(&m_cmd[1]); if (m_type == SD_TYPE_V2) { m_blknext /= m_xferblk; } send_data(1, SD_STATE_DATA_MULTI); } else { // FIXME: support multi-block read when transfer size is smaller than block size m_data[0] = 0x40; // parameter error send_data(1, SD_STATE_TRAN); } } else { m_data[0] = 0xff; // show an error send_data(1, SD_STATE_TRAN); } break; case 24: // CMD24 - WRITE_BLOCK if (m_xferblk != m_blksize) { // partial block write not supported LOG("rejecting write of %u bytes that is not a full %u-byte block\n", m_xferblk, m_blksize); m_data[0] = 0x40; // parameter error send_data(1, SD_STATE_TRAN); } else { m_blknext = get_u32be(&m_cmd[1]); if ((m_type == SD_TYPE_V2) && (m_blknext % m_blksize)) { // misaligned write not supported LOG("rejecting write of %u bytes at %u that crosses %u-byte block boundary\n", m_xferblk, m_blknext, m_blksize); m_data[0] = 0x40; // parameter error send_data(1, SD_STATE_TRAN); } else { if (m_type == SD_TYPE_V2) { m_blknext /= m_xferblk; } m_data[0] = 0; send_data(1, SD_STATE_WRITE_WAITFE); } } break; case 41: if (m_bACMD) // ACMD41 - SD_SEND_OP_COND { m_data[0] = 0; send_data(1, SD_STATE_READY); // + SD_STATE_IDLE } else // CMD41 - illegal { m_data[0] = 0xff; send_data(1, SD_STATE_INA); } break; case 55: // CMD55 - APP_CMD m_data[0] = 0x01; send_data(1, SD_STATE_IDLE); break; case 58: // CMD58 - READ_OCR m_data[0] = 0; m_data[1] = 0x80; // Busy Status: 1b - Initialization Complete m_data[1] |= (m_type == SD_TYPE_V2) ? 0 : 0x40; // Card Capacity Status: 0b - SDCS, 1b SDHC, SDXC m_data[2] = 0; m_data[3] = 0; m_data[4] = 0; send_data(5, SD_STATE_DATA); break; case 59: // CMD59 - CRC_ON_OFF m_crc_off = !BIT(m_cmd[4], 0); m_data[0] = 0; send_data(1, SD_STATE_STBY); break; default: LOGMASKED(LOG_COMMAND, "SDCARD: Unsupported CMD%02d\n", m_cmd[0] & 0x3f); clean_cmd = false; break; } // if this is command 55, that's a prefix indicating the next command is an "app command" or "ACMD" m_bACMD = (m_cmd[0] & 0x3f) == 55; if (clean_cmd) memset(m_cmd, 0xff, 6); } } void spi_sdcard_device::change_state(sd_state new_state) { // TODO validate if transition is valid using refs below. // REF Figure 4-13:SD Memory Card State Diagram (Transition Mode) // REF Table 4-35:Card State Transition Table m_state = new_state; }