/* * SSI to SD card adapter. * * Copyright (c) 2007-2009 CodeSourcery. * Written by Paul Brook * * Copyright (c) 2021 Wind River Systems, Inc. * Improved by Bin Meng * * Validated with U-Boot v2021.01 and Linux v5.10 mmc_spi driver * * This code is licensed under the GNU GPL v2. * * Contributions after 2012-01-13 are licensed under the terms of the * GNU GPL, version 2 or (at your option) any later version. */ #include "qemu/osdep.h" #include "sysemu/blockdev.h" #include "hw/ssi/ssi.h" #include "migration/vmstate.h" #include "hw/qdev-properties.h" #include "hw/sd/sd.h" #include "qapi/error.h" #include "qemu/crc-ccitt.h" #include "qemu/module.h" #include "qom/object.h" //#define DEBUG_SSI_SD 1 #ifdef DEBUG_SSI_SD #define DPRINTF(fmt, ...) \ do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0) #define BADF(fmt, ...) \ do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0) #else #define DPRINTF(fmt, ...) do {} while(0) #define BADF(fmt, ...) \ do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__);} while (0) #endif typedef enum { SSI_SD_CMD = 0, SSI_SD_CMDARG, SSI_SD_PREP_RESP, SSI_SD_RESPONSE, SSI_SD_PREP_DATA, SSI_SD_DATA_START, SSI_SD_DATA_READ, SSI_SD_DATA_CRC16, SSI_SD_DATA_WRITE, SSI_SD_SKIP_CRC16, } ssi_sd_mode; struct ssi_sd_state { SSIPeripheral ssidev; uint32_t mode; int cmd; uint8_t cmdarg[4]; uint8_t response[5]; uint16_t crc16; int32_t read_bytes; int32_t write_bytes; int32_t arglen; int32_t response_pos; int32_t stopping; SDBus sdbus; }; #define TYPE_SSI_SD "ssi-sd" OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD) /* State word bits. */ #define SSI_SDR_LOCKED 0x0001 #define SSI_SDR_WP_ERASE 0x0002 #define SSI_SDR_ERROR 0x0004 #define SSI_SDR_CC_ERROR 0x0008 #define SSI_SDR_ECC_FAILED 0x0010 #define SSI_SDR_WP_VIOLATION 0x0020 #define SSI_SDR_ERASE_PARAM 0x0040 #define SSI_SDR_OUT_OF_RANGE 0x0080 #define SSI_SDR_IDLE 0x0100 #define SSI_SDR_ERASE_RESET 0x0200 #define SSI_SDR_ILLEGAL_COMMAND 0x0400 #define SSI_SDR_COM_CRC_ERROR 0x0800 #define SSI_SDR_ERASE_SEQ_ERROR 0x1000 #define SSI_SDR_ADDRESS_ERROR 0x2000 #define SSI_SDR_PARAMETER_ERROR 0x4000 /* multiple block write */ #define SSI_TOKEN_MULTI_WRITE 0xfc /* terminate multiple block write */ #define SSI_TOKEN_STOP_TRAN 0xfd /* single block read/write, multiple block read */ #define SSI_TOKEN_SINGLE 0xfe /* dummy value - don't care */ #define SSI_DUMMY 0xff /* data accepted */ #define DATA_RESPONSE_ACCEPTED 0x05 static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val) { ssi_sd_state *s = SSI_SD(dev); SDRequest request; uint8_t longresp[16]; /* * Special case: allow CMD12 (STOP TRANSMISSION) while reading data. * * See "Physical Layer Specification Version 8.00" chapter 7.5.2.2, * to avoid conflict between CMD12 response and next data block, * timing of CMD12 should be controlled as follows: * * - CMD12 issued at the timing that end bit of CMD12 and end bit of * data block is overlapped * - CMD12 issued after one clock cycle after host receives a token * (either Start Block token or Data Error token) * * We need to catch CMD12 in all of the data read states. */ if (s->mode >= SSI_SD_PREP_DATA && s->mode <= SSI_SD_DATA_CRC16) { if (val == 0x4c) { s->mode = SSI_SD_CMD; /* There must be at least one byte delay before the card responds */ s->stopping = 1; } } switch (s->mode) { case SSI_SD_CMD: switch (val) { case SSI_DUMMY: DPRINTF("NULL command\n"); return SSI_DUMMY; break; case SSI_TOKEN_SINGLE: case SSI_TOKEN_MULTI_WRITE: DPRINTF("Start write block\n"); s->mode = SSI_SD_DATA_WRITE; return SSI_DUMMY; case SSI_TOKEN_STOP_TRAN: DPRINTF("Stop multiple write\n"); /* manually issue cmd12 to stop the transfer */ request.cmd = 12; request.arg = 0; s->arglen = sdbus_do_command(&s->sdbus, &request, longresp); if (s->arglen <= 0) { s->arglen = 1; /* a zero value indicates the card is busy */ s->response[0] = 0; DPRINTF("SD card busy\n"); } else { s->arglen = 1; /* a non-zero value indicates the card is ready */ s->response[0] = SSI_DUMMY; } return SSI_DUMMY; } s->cmd = val & 0x3f; s->mode = SSI_SD_CMDARG; s->arglen = 0; return SSI_DUMMY; case SSI_SD_CMDARG: if (s->arglen == 4) { /* FIXME: Check CRC. */ request.cmd = s->cmd; request.arg = ldl_be_p(s->cmdarg); DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg); s->arglen = sdbus_do_command(&s->sdbus, &request, longresp); if (s->arglen <= 0) { s->arglen = 1; s->response[0] = 4; DPRINTF("SD command failed\n"); } else if (s->cmd == 8 || s->cmd == 58) { /* CMD8/CMD58 returns R3/R7 response */ DPRINTF("Returned R3/R7\n"); s->arglen = 5; s->response[0] = 1; memcpy(&s->response[1], longresp, 4); } else if (s->arglen != 4) { BADF("Unexpected response to cmd %d\n", s->cmd); /* Illegal command is about as near as we can get. */ s->arglen = 1; s->response[0] = 4; } else { /* All other commands return status. */ uint32_t cardstatus; uint16_t status; /* CMD13 returns a 2-byte statuse work. Other commands only return the first byte. */ s->arglen = (s->cmd == 13) ? 2 : 1; /* handle R1b */ if (s->cmd == 28 || s->cmd == 29 || s->cmd == 38) { s->stopping = 1; } cardstatus = ldl_be_p(longresp); status = 0; if (((cardstatus >> 9) & 0xf) < 4) status |= SSI_SDR_IDLE; if (cardstatus & ERASE_RESET) status |= SSI_SDR_ERASE_RESET; if (cardstatus & ILLEGAL_COMMAND) status |= SSI_SDR_ILLEGAL_COMMAND; if (cardstatus & COM_CRC_ERROR) status |= SSI_SDR_COM_CRC_ERROR; if (cardstatus & ERASE_SEQ_ERROR) status |= SSI_SDR_ERASE_SEQ_ERROR; if (cardstatus & ADDRESS_ERROR) status |= SSI_SDR_ADDRESS_ERROR; if (cardstatus & CARD_IS_LOCKED) status |= SSI_SDR_LOCKED; if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP)) status |= SSI_SDR_WP_ERASE; if (cardstatus & SD_ERROR) status |= SSI_SDR_ERROR; if (cardstatus & CC_ERROR) status |= SSI_SDR_CC_ERROR; if (cardstatus & CARD_ECC_FAILED) status |= SSI_SDR_ECC_FAILED; if (cardstatus & WP_VIOLATION) status |= SSI_SDR_WP_VIOLATION; if (cardstatus & ERASE_PARAM) status |= SSI_SDR_ERASE_PARAM; if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE)) status |= SSI_SDR_OUT_OF_RANGE; /* ??? Don't know what Parameter Error really means, so assume it's set if the second byte is nonzero. */ if (status & 0xff) status |= SSI_SDR_PARAMETER_ERROR; s->response[0] = status >> 8; s->response[1] = status; DPRINTF("Card status 0x%02x\n", status); } s->mode = SSI_SD_PREP_RESP; s->response_pos = 0; } else { s->cmdarg[s->arglen++] = val; } return SSI_DUMMY; case SSI_SD_PREP_RESP: DPRINTF("Prepare card response (Ncr)\n"); s->mode = SSI_SD_RESPONSE; return SSI_DUMMY; case SSI_SD_RESPONSE: if (s->response_pos < s->arglen) { DPRINTF("Response 0x%02x\n", s->response[s->response_pos]); return s->response[s->response_pos++]; } if (s->stopping) { s->stopping = 0; s->mode = SSI_SD_CMD; return SSI_DUMMY; } if (sdbus_data_ready(&s->sdbus)) { DPRINTF("Data read\n"); s->mode = SSI_SD_DATA_START; } else { DPRINTF("End of command\n"); s->mode = SSI_SD_CMD; } return SSI_DUMMY; case SSI_SD_PREP_DATA: DPRINTF("Prepare data block (Nac)\n"); s->mode = SSI_SD_DATA_START; return SSI_DUMMY; case SSI_SD_DATA_START: DPRINTF("Start read block\n"); s->mode = SSI_SD_DATA_READ; s->response_pos = 0; return SSI_TOKEN_SINGLE; case SSI_SD_DATA_READ: val = sdbus_read_byte(&s->sdbus); s->read_bytes++; s->crc16 = crc_ccitt_false(s->crc16, (uint8_t *)&val, 1); if (!sdbus_data_ready(&s->sdbus) || s->read_bytes == 512) { DPRINTF("Data read end\n"); s->mode = SSI_SD_DATA_CRC16; } return val; case SSI_SD_DATA_CRC16: val = (s->crc16 & 0xff00) >> 8; s->crc16 <<= 8; s->response_pos++; if (s->response_pos == 2) { DPRINTF("CRC16 read end\n"); if (s->read_bytes == 512 && s->cmd != 17) { s->mode = SSI_SD_PREP_DATA; } else { s->mode = SSI_SD_CMD; } s->read_bytes = 0; s->response_pos = 0; } return val; case SSI_SD_DATA_WRITE: sdbus_write_byte(&s->sdbus, val); s->write_bytes++; if (!sdbus_receive_ready(&s->sdbus) || s->write_bytes == 512) { DPRINTF("Data write end\n"); s->mode = SSI_SD_SKIP_CRC16; s->response_pos = 0; } return val; case SSI_SD_SKIP_CRC16: /* we don't verify the crc16 */ s->response_pos++; if (s->response_pos == 2) { DPRINTF("CRC16 receive end\n"); s->mode = SSI_SD_RESPONSE; s->write_bytes = 0; s->arglen = 1; s->response[0] = DATA_RESPONSE_ACCEPTED; s->response_pos = 0; } return SSI_DUMMY; } /* Should never happen. */ return SSI_DUMMY; } static int ssi_sd_post_load(void *opaque, int version_id) { ssi_sd_state *s = (ssi_sd_state *)opaque; if (s->mode > SSI_SD_SKIP_CRC16) { return -EINVAL; } if (s->mode == SSI_SD_CMDARG && (s->arglen < 0 || s->arglen >= ARRAY_SIZE(s->cmdarg))) { return -EINVAL; } if (s->mode == SSI_SD_RESPONSE && (s->response_pos < 0 || s->response_pos >= ARRAY_SIZE(s->response) || (!s->stopping && s->arglen > ARRAY_SIZE(s->response)))) { return -EINVAL; } return 0; } static const VMStateDescription vmstate_ssi_sd = { .name = "ssi_sd", .version_id = 7, .minimum_version_id = 7, .post_load = ssi_sd_post_load, .fields = (VMStateField []) { VMSTATE_UINT32(mode, ssi_sd_state), VMSTATE_INT32(cmd, ssi_sd_state), VMSTATE_UINT8_ARRAY(cmdarg, ssi_sd_state, 4), VMSTATE_UINT8_ARRAY(response, ssi_sd_state, 5), VMSTATE_UINT16(crc16, ssi_sd_state), VMSTATE_INT32(read_bytes, ssi_sd_state), VMSTATE_INT32(write_bytes, ssi_sd_state), VMSTATE_INT32(arglen, ssi_sd_state), VMSTATE_INT32(response_pos, ssi_sd_state), VMSTATE_INT32(stopping, ssi_sd_state), VMSTATE_SSI_PERIPHERAL(ssidev, ssi_sd_state), VMSTATE_END_OF_LIST() } }; static void ssi_sd_realize(SSIPeripheral *d, Error **errp) { ssi_sd_state *s = SSI_SD(d); qbus_init(&s->sdbus, sizeof(s->sdbus), TYPE_SD_BUS, DEVICE(d), "sd-bus"); } static void ssi_sd_reset(DeviceState *dev) { ssi_sd_state *s = SSI_SD(dev); s->mode = SSI_SD_CMD; s->cmd = 0; memset(s->cmdarg, 0, sizeof(s->cmdarg)); memset(s->response, 0, sizeof(s->response)); s->crc16 = 0; s->read_bytes = 0; s->write_bytes = 0; s->arglen = 0; s->response_pos = 0; s->stopping = 0; } static void ssi_sd_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass); k->realize = ssi_sd_realize; k->transfer = ssi_sd_transfer; k->cs_polarity = SSI_CS_LOW; dc->vmsd = &vmstate_ssi_sd; dc->reset = ssi_sd_reset; /* Reason: GPIO chip-select line should be wired up */ dc->user_creatable = false; } static const TypeInfo ssi_sd_info = { .name = TYPE_SSI_SD, .parent = TYPE_SSI_PERIPHERAL, .instance_size = sizeof(ssi_sd_state), .class_init = ssi_sd_class_init, }; static void ssi_sd_register_types(void) { type_register_static(&ssi_sd_info); } type_init(ssi_sd_register_types)