pbrook | 775616c | 2007-11-24 23:35:08 +0000 | [diff] [blame] | 1 | /* |
| 2 | * SSI to SD card adapter. |
| 3 | * |
| 4 | * Copyright (c) 2007 CodeSourcery. |
| 5 | * Written by Paul Brook |
| 6 | * |
| 7 | * This code is licenced under the GPL. |
| 8 | */ |
| 9 | |
| 10 | #include "hw.h" |
| 11 | #include "sd.h" |
| 12 | |
| 13 | //#define DEBUG_SSI_SD 1 |
| 14 | |
| 15 | #ifdef DEBUG_SSI_SD |
| 16 | #define DPRINTF(fmt, args...) \ |
| 17 | do { printf("ssi_sd: " fmt , ##args); } while (0) |
| 18 | #define BADF(fmt, args...) \ |
| 19 | do { fprintf(stderr, "ssi_sd: error: " fmt , ##args); exit(1);} while (0) |
| 20 | #else |
| 21 | #define DPRINTF(fmt, args...) do {} while(0) |
| 22 | #define BADF(fmt, args...) \ |
| 23 | do { fprintf(stderr, "ssi_sd: error: " fmt , ##args);} while (0) |
| 24 | #endif |
| 25 | |
| 26 | typedef enum { |
| 27 | SSI_SD_CMD, |
| 28 | SSI_SD_CMDARG, |
| 29 | SSI_SD_RESPONSE, |
| 30 | SSI_SD_DATA_START, |
| 31 | SSI_SD_DATA_READ, |
| 32 | } ssi_sd_mode; |
| 33 | |
| 34 | typedef struct { |
| 35 | ssi_sd_mode mode; |
| 36 | int cmd; |
| 37 | uint8_t cmdarg[4]; |
| 38 | uint8_t response[5]; |
| 39 | int arglen; |
| 40 | int response_pos; |
| 41 | int stopping; |
| 42 | SDState *sd; |
| 43 | } ssi_sd_state; |
| 44 | |
| 45 | /* State word bits. */ |
| 46 | #define SSI_SDR_LOCKED 0x0001 |
| 47 | #define SSI_SDR_WP_ERASE 0x0002 |
| 48 | #define SSI_SDR_ERROR 0x0004 |
| 49 | #define SSI_SDR_CC_ERROR 0x0008 |
| 50 | #define SSI_SDR_ECC_FAILED 0x0010 |
| 51 | #define SSI_SDR_WP_VIOLATION 0x0020 |
| 52 | #define SSI_SDR_ERASE_PARAM 0x0040 |
| 53 | #define SSI_SDR_OUT_OF_RANGE 0x0080 |
| 54 | #define SSI_SDR_IDLE 0x0100 |
| 55 | #define SSI_SDR_ERASE_RESET 0x0200 |
| 56 | #define SSI_SDR_ILLEGAL_COMMAND 0x0400 |
| 57 | #define SSI_SDR_COM_CRC_ERROR 0x0800 |
| 58 | #define SSI_SDR_ERASE_SEQ_ERROR 0x1000 |
| 59 | #define SSI_SDR_ADDRESS_ERROR 0x2000 |
| 60 | #define SSI_SDR_PARAMETER_ERROR 0x4000 |
| 61 | |
| 62 | int ssi_sd_xfer(void *opaque, int val) |
| 63 | { |
| 64 | ssi_sd_state *s = (ssi_sd_state *)opaque; |
| 65 | |
| 66 | /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */ |
| 67 | if (s->mode == SSI_SD_DATA_READ && val == 0x4d) { |
| 68 | s->mode = SSI_SD_CMD; |
| 69 | /* There must be at least one byte delay before the card responds. */ |
| 70 | s->stopping = 1; |
| 71 | } |
| 72 | |
| 73 | switch (s->mode) { |
| 74 | case SSI_SD_CMD: |
| 75 | if (val == 0xff) { |
| 76 | DPRINTF("NULL command\n"); |
| 77 | return 0xff; |
| 78 | } |
| 79 | s->cmd = val & 0x3f; |
| 80 | s->mode = SSI_SD_CMDARG; |
| 81 | s->arglen = 0; |
| 82 | return 0xff; |
| 83 | case SSI_SD_CMDARG: |
| 84 | if (s->arglen == 4) { |
| 85 | struct sd_request_s request; |
| 86 | uint8_t longresp[16]; |
| 87 | /* FIXME: Check CRC. */ |
| 88 | request.cmd = s->cmd; |
| 89 | request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16) |
| 90 | | (s->cmdarg[2] << 8) | s->cmdarg[3]; |
| 91 | DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg); |
| 92 | s->arglen = sd_do_command(s->sd, &request, longresp); |
| 93 | if (s->arglen <= 0) { |
| 94 | s->arglen = 1; |
| 95 | s->response[0] = 4; |
| 96 | DPRINTF("SD command failed\n"); |
| 97 | } else if (s->cmd == 58) { |
| 98 | /* CMD58 returns R3 response (OCR) */ |
| 99 | DPRINTF("Returned OCR\n"); |
| 100 | s->arglen = 5; |
| 101 | s->response[0] = 1; |
| 102 | memcpy(&s->response[1], longresp, 4); |
| 103 | } else if (s->arglen != 4) { |
| 104 | BADF("Unexpected response to cmd %d\n", s->cmd); |
| 105 | /* Illegal command is about as near as we can get. */ |
| 106 | s->arglen = 1; |
| 107 | s->response[0] = 4; |
| 108 | } else { |
| 109 | /* All other commands return status. */ |
| 110 | uint32_t cardstatus; |
| 111 | uint16_t status; |
| 112 | /* CMD13 returns a 2-byte statuse work. Other commands |
| 113 | only return the first byte. */ |
| 114 | s->arglen = (s->cmd == 13) ? 2 : 1; |
| 115 | cardstatus = (longresp[0] << 24) | (longresp[1] << 16) |
| 116 | | (longresp[2] << 8) | longresp[3]; |
| 117 | status = 0; |
| 118 | if (((cardstatus >> 9) & 0xf) < 4) |
| 119 | status |= SSI_SDR_IDLE; |
| 120 | if (cardstatus & ERASE_RESET) |
| 121 | status |= SSI_SDR_ERASE_RESET; |
| 122 | if (cardstatus & ILLEGAL_COMMAND) |
| 123 | status |= SSI_SDR_ILLEGAL_COMMAND; |
| 124 | if (cardstatus & COM_CRC_ERROR) |
| 125 | status |= SSI_SDR_COM_CRC_ERROR; |
| 126 | if (cardstatus & ERASE_SEQ_ERROR) |
| 127 | status |= SSI_SDR_ERASE_SEQ_ERROR; |
| 128 | if (cardstatus & ADDRESS_ERROR) |
| 129 | status |= SSI_SDR_ADDRESS_ERROR; |
| 130 | if (cardstatus & CARD_IS_LOCKED) |
| 131 | status |= SSI_SDR_LOCKED; |
| 132 | if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP)) |
| 133 | status |= SSI_SDR_WP_ERASE; |
| 134 | if (cardstatus & SD_ERROR) |
| 135 | status |= SSI_SDR_ERROR; |
| 136 | if (cardstatus & CC_ERROR) |
| 137 | status |= SSI_SDR_CC_ERROR; |
| 138 | if (cardstatus & CARD_ECC_FAILED) |
| 139 | status |= SSI_SDR_ECC_FAILED; |
| 140 | if (cardstatus & WP_VIOLATION) |
| 141 | status |= SSI_SDR_WP_VIOLATION; |
| 142 | if (cardstatus & ERASE_PARAM) |
| 143 | status |= SSI_SDR_ERASE_PARAM; |
| 144 | if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE)) |
| 145 | status |= SSI_SDR_OUT_OF_RANGE; |
| 146 | /* ??? Don't know what Parameter Error really means, so |
| 147 | assume it's set if the second byte is nonzero. */ |
| 148 | if (status & 0xff) |
| 149 | status |= SSI_SDR_PARAMETER_ERROR; |
| 150 | s->response[0] = status >> 8; |
| 151 | s->response[1] = status; |
| 152 | DPRINTF("Card status 0x%02x\n", status); |
| 153 | } |
| 154 | s->mode = SSI_SD_RESPONSE; |
| 155 | s->response_pos = 0; |
| 156 | } else { |
| 157 | s->cmdarg[s->arglen++] = val; |
| 158 | } |
| 159 | return 0xff; |
| 160 | case SSI_SD_RESPONSE: |
| 161 | if (s->stopping) { |
| 162 | s->stopping = 0; |
| 163 | return 0xff; |
| 164 | } |
| 165 | if (s->response_pos < s->arglen) { |
| 166 | DPRINTF("Response 0x%02x\n", s->response[s->response_pos]); |
| 167 | return s->response[s->response_pos++]; |
| 168 | } |
| 169 | if (sd_data_ready(s->sd)) { |
| 170 | DPRINTF("Data read\n"); |
| 171 | s->mode = SSI_SD_DATA_START; |
| 172 | } else { |
| 173 | DPRINTF("End of command\n"); |
| 174 | s->mode = SSI_SD_CMD; |
| 175 | } |
| 176 | return 0xff; |
| 177 | case SSI_SD_DATA_START: |
| 178 | DPRINTF("Start read block\n"); |
| 179 | s->mode = SSI_SD_DATA_READ; |
| 180 | return 0xfe; |
| 181 | case SSI_SD_DATA_READ: |
| 182 | val = sd_read_data(s->sd); |
| 183 | if (!sd_data_ready(s->sd)) { |
| 184 | DPRINTF("Data read end\n"); |
| 185 | s->mode = SSI_SD_CMD; |
| 186 | } |
| 187 | return val; |
| 188 | } |
| 189 | /* Should never happen. */ |
| 190 | return 0xff; |
| 191 | } |
| 192 | |
pbrook | 23e3929 | 2008-07-02 16:48:32 +0000 | [diff] [blame] | 193 | static void ssi_sd_save(QEMUFile *f, void *opaque) |
| 194 | { |
| 195 | ssi_sd_state *s = (ssi_sd_state *)opaque; |
| 196 | int i; |
| 197 | |
| 198 | qemu_put_be32(f, s->mode); |
| 199 | qemu_put_be32(f, s->cmd); |
| 200 | for (i = 0; i < 4; i++) |
| 201 | qemu_put_be32(f, s->cmdarg[i]); |
| 202 | for (i = 0; i < 5; i++) |
| 203 | qemu_put_be32(f, s->response[i]); |
| 204 | qemu_put_be32(f, s->arglen); |
| 205 | qemu_put_be32(f, s->response_pos); |
| 206 | qemu_put_be32(f, s->stopping); |
| 207 | } |
| 208 | |
| 209 | static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id) |
| 210 | { |
| 211 | ssi_sd_state *s = (ssi_sd_state *)opaque; |
| 212 | int i; |
| 213 | |
| 214 | if (version_id != 1) |
| 215 | return -EINVAL; |
| 216 | |
| 217 | s->mode = qemu_get_be32(f); |
| 218 | s->cmd = qemu_get_be32(f); |
| 219 | for (i = 0; i < 4; i++) |
| 220 | s->cmdarg[i] = qemu_get_be32(f); |
| 221 | for (i = 0; i < 5; i++) |
| 222 | s->response[i] = qemu_get_be32(f); |
| 223 | s->arglen = qemu_get_be32(f); |
| 224 | s->response_pos = qemu_get_be32(f); |
| 225 | s->stopping = qemu_get_be32(f); |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
pbrook | 775616c | 2007-11-24 23:35:08 +0000 | [diff] [blame] | 230 | void *ssi_sd_init(BlockDriverState *bs) |
| 231 | { |
| 232 | ssi_sd_state *s; |
| 233 | |
| 234 | s = (ssi_sd_state *)qemu_mallocz(sizeof(ssi_sd_state)); |
| 235 | s->mode = SSI_SD_CMD; |
| 236 | s->sd = sd_init(bs, 1); |
pbrook | 23e3929 | 2008-07-02 16:48:32 +0000 | [diff] [blame] | 237 | register_savevm("ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s); |
pbrook | 775616c | 2007-11-24 23:35:08 +0000 | [diff] [blame] | 238 | return s; |
| 239 | } |