| /* |
| * SSI to SD card adapter. |
| * |
| * Copyright (c) 2007-2009 CodeSourcery. |
| * Written by Paul Brook |
| * |
| * This code is licenced under the GNU GPL v2. |
| */ |
| |
| #include "ssi.h" |
| #include "sd.h" |
| #include "sysemu.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, |
| SSI_SD_CMDARG, |
| SSI_SD_RESPONSE, |
| SSI_SD_DATA_START, |
| SSI_SD_DATA_READ, |
| } ssi_sd_mode; |
| |
| typedef struct { |
| SSISlave ssidev; |
| ssi_sd_mode mode; |
| int cmd; |
| uint8_t cmdarg[4]; |
| uint8_t response[5]; |
| int arglen; |
| int response_pos; |
| int stopping; |
| SDState *sd; |
| } ssi_sd_state; |
| |
| /* 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 |
| |
| static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val) |
| { |
| ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev); |
| |
| /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */ |
| if (s->mode == SSI_SD_DATA_READ && val == 0x4d) { |
| 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: |
| if (val == 0xff) { |
| DPRINTF("NULL command\n"); |
| return 0xff; |
| } |
| s->cmd = val & 0x3f; |
| s->mode = SSI_SD_CMDARG; |
| s->arglen = 0; |
| return 0xff; |
| case SSI_SD_CMDARG: |
| if (s->arglen == 4) { |
| SDRequest request; |
| uint8_t longresp[16]; |
| /* FIXME: Check CRC. */ |
| request.cmd = s->cmd; |
| request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16) |
| | (s->cmdarg[2] << 8) | s->cmdarg[3]; |
| DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg); |
| s->arglen = sd_do_command(s->sd, &request, longresp); |
| if (s->arglen <= 0) { |
| s->arglen = 1; |
| s->response[0] = 4; |
| DPRINTF("SD command failed\n"); |
| } else if (s->cmd == 58) { |
| /* CMD58 returns R3 response (OCR) */ |
| DPRINTF("Returned OCR\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; |
| cardstatus = (longresp[0] << 24) | (longresp[1] << 16) |
| | (longresp[2] << 8) | longresp[3]; |
| 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_RESPONSE; |
| s->response_pos = 0; |
| } else { |
| s->cmdarg[s->arglen++] = val; |
| } |
| return 0xff; |
| case SSI_SD_RESPONSE: |
| if (s->stopping) { |
| s->stopping = 0; |
| return 0xff; |
| } |
| if (s->response_pos < s->arglen) { |
| DPRINTF("Response 0x%02x\n", s->response[s->response_pos]); |
| return s->response[s->response_pos++]; |
| } |
| if (sd_data_ready(s->sd)) { |
| DPRINTF("Data read\n"); |
| s->mode = SSI_SD_DATA_START; |
| } else { |
| DPRINTF("End of command\n"); |
| s->mode = SSI_SD_CMD; |
| } |
| return 0xff; |
| case SSI_SD_DATA_START: |
| DPRINTF("Start read block\n"); |
| s->mode = SSI_SD_DATA_READ; |
| return 0xfe; |
| case SSI_SD_DATA_READ: |
| val = sd_read_data(s->sd); |
| if (!sd_data_ready(s->sd)) { |
| DPRINTF("Data read end\n"); |
| s->mode = SSI_SD_CMD; |
| } |
| return val; |
| } |
| /* Should never happen. */ |
| return 0xff; |
| } |
| |
| static void ssi_sd_save(QEMUFile *f, void *opaque) |
| { |
| ssi_sd_state *s = (ssi_sd_state *)opaque; |
| int i; |
| |
| qemu_put_be32(f, s->mode); |
| qemu_put_be32(f, s->cmd); |
| for (i = 0; i < 4; i++) |
| qemu_put_be32(f, s->cmdarg[i]); |
| for (i = 0; i < 5; i++) |
| qemu_put_be32(f, s->response[i]); |
| qemu_put_be32(f, s->arglen); |
| qemu_put_be32(f, s->response_pos); |
| qemu_put_be32(f, s->stopping); |
| } |
| |
| static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id) |
| { |
| ssi_sd_state *s = (ssi_sd_state *)opaque; |
| int i; |
| |
| if (version_id != 1) |
| return -EINVAL; |
| |
| s->mode = qemu_get_be32(f); |
| s->cmd = qemu_get_be32(f); |
| for (i = 0; i < 4; i++) |
| s->cmdarg[i] = qemu_get_be32(f); |
| for (i = 0; i < 5; i++) |
| s->response[i] = qemu_get_be32(f); |
| s->arglen = qemu_get_be32(f); |
| s->response_pos = qemu_get_be32(f); |
| s->stopping = qemu_get_be32(f); |
| |
| return 0; |
| } |
| |
| static void ssi_sd_init(SSISlave *dev) |
| { |
| ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev); |
| BlockDriverState *bs; |
| |
| s->mode = SSI_SD_CMD; |
| bs = qdev_init_bdrv(&dev->qdev, IF_SD); |
| s->sd = sd_init(bs, 1); |
| register_savevm("ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s); |
| } |
| |
| static SSISlaveInfo ssi_sd_info = { |
| .qdev.name = "ssi-sd", |
| .qdev.size = sizeof(ssi_sd_state), |
| .init = ssi_sd_init, |
| .transfer = ssi_sd_transfer |
| }; |
| |
| static void ssi_sd_register_devices(void) |
| { |
| ssi_register_slave(&ssi_sd_info); |
| } |
| |
| device_init(ssi_sd_register_devices) |
