1 /* 2 * SSI to SD card adapter. 3 * 4 * Copyright (c) 2007-2009 CodeSourcery. 5 * Written by Paul Brook 6 * 7 * This code is licensed under the GNU GPL v2. 8 * 9 * Contributions after 2012-01-13 are licensed under the terms of the 10 * GNU GPL, version 2 or (at your option) any later version. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "sysemu/block-backend.h" 15 #include "sysemu/blockdev.h" 16 #include "hw/ssi/ssi.h" 17 #include "hw/sd/sd.h" 18 #include "qapi/error.h" 19 20 //#define DEBUG_SSI_SD 1 21 22 #ifdef DEBUG_SSI_SD 23 #define DPRINTF(fmt, ...) \ 24 do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0) 25 #define BADF(fmt, ...) \ 26 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0) 27 #else 28 #define DPRINTF(fmt, ...) do {} while(0) 29 #define BADF(fmt, ...) \ 30 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__);} while (0) 31 #endif 32 33 typedef enum { 34 SSI_SD_CMD, 35 SSI_SD_CMDARG, 36 SSI_SD_RESPONSE, 37 SSI_SD_DATA_START, 38 SSI_SD_DATA_READ, 39 } ssi_sd_mode; 40 41 typedef struct { 42 SSISlave ssidev; 43 ssi_sd_mode mode; 44 int cmd; 45 uint8_t cmdarg[4]; 46 uint8_t response[5]; 47 int arglen; 48 int response_pos; 49 int stopping; 50 SDState *sd; 51 } ssi_sd_state; 52 53 /* State word bits. */ 54 #define SSI_SDR_LOCKED 0x0001 55 #define SSI_SDR_WP_ERASE 0x0002 56 #define SSI_SDR_ERROR 0x0004 57 #define SSI_SDR_CC_ERROR 0x0008 58 #define SSI_SDR_ECC_FAILED 0x0010 59 #define SSI_SDR_WP_VIOLATION 0x0020 60 #define SSI_SDR_ERASE_PARAM 0x0040 61 #define SSI_SDR_OUT_OF_RANGE 0x0080 62 #define SSI_SDR_IDLE 0x0100 63 #define SSI_SDR_ERASE_RESET 0x0200 64 #define SSI_SDR_ILLEGAL_COMMAND 0x0400 65 #define SSI_SDR_COM_CRC_ERROR 0x0800 66 #define SSI_SDR_ERASE_SEQ_ERROR 0x1000 67 #define SSI_SDR_ADDRESS_ERROR 0x2000 68 #define SSI_SDR_PARAMETER_ERROR 0x4000 69 70 static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val) 71 { 72 ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev); 73 74 /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */ 75 if (s->mode == SSI_SD_DATA_READ && val == 0x4d) { 76 s->mode = SSI_SD_CMD; 77 /* There must be at least one byte delay before the card responds. */ 78 s->stopping = 1; 79 } 80 81 switch (s->mode) { 82 case SSI_SD_CMD: 83 if (val == 0xff) { 84 DPRINTF("NULL command\n"); 85 return 0xff; 86 } 87 s->cmd = val & 0x3f; 88 s->mode = SSI_SD_CMDARG; 89 s->arglen = 0; 90 return 0xff; 91 case SSI_SD_CMDARG: 92 if (s->arglen == 4) { 93 SDRequest request; 94 uint8_t longresp[16]; 95 /* FIXME: Check CRC. */ 96 request.cmd = s->cmd; 97 request.arg = (s->cmdarg[0] << 24) | (s->cmdarg[1] << 16) 98 | (s->cmdarg[2] << 8) | s->cmdarg[3]; 99 DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg); 100 s->arglen = sd_do_command(s->sd, &request, longresp); 101 if (s->arglen <= 0) { 102 s->arglen = 1; 103 s->response[0] = 4; 104 DPRINTF("SD command failed\n"); 105 } else if (s->cmd == 58) { 106 /* CMD58 returns R3 response (OCR) */ 107 DPRINTF("Returned OCR\n"); 108 s->arglen = 5; 109 s->response[0] = 1; 110 memcpy(&s->response[1], longresp, 4); 111 } else if (s->arglen != 4) { 112 BADF("Unexpected response to cmd %d\n", s->cmd); 113 /* Illegal command is about as near as we can get. */ 114 s->arglen = 1; 115 s->response[0] = 4; 116 } else { 117 /* All other commands return status. */ 118 uint32_t cardstatus; 119 uint16_t status; 120 /* CMD13 returns a 2-byte statuse work. Other commands 121 only return the first byte. */ 122 s->arglen = (s->cmd == 13) ? 2 : 1; 123 cardstatus = (longresp[0] << 24) | (longresp[1] << 16) 124 | (longresp[2] << 8) | longresp[3]; 125 status = 0; 126 if (((cardstatus >> 9) & 0xf) < 4) 127 status |= SSI_SDR_IDLE; 128 if (cardstatus & ERASE_RESET) 129 status |= SSI_SDR_ERASE_RESET; 130 if (cardstatus & ILLEGAL_COMMAND) 131 status |= SSI_SDR_ILLEGAL_COMMAND; 132 if (cardstatus & COM_CRC_ERROR) 133 status |= SSI_SDR_COM_CRC_ERROR; 134 if (cardstatus & ERASE_SEQ_ERROR) 135 status |= SSI_SDR_ERASE_SEQ_ERROR; 136 if (cardstatus & ADDRESS_ERROR) 137 status |= SSI_SDR_ADDRESS_ERROR; 138 if (cardstatus & CARD_IS_LOCKED) 139 status |= SSI_SDR_LOCKED; 140 if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP)) 141 status |= SSI_SDR_WP_ERASE; 142 if (cardstatus & SD_ERROR) 143 status |= SSI_SDR_ERROR; 144 if (cardstatus & CC_ERROR) 145 status |= SSI_SDR_CC_ERROR; 146 if (cardstatus & CARD_ECC_FAILED) 147 status |= SSI_SDR_ECC_FAILED; 148 if (cardstatus & WP_VIOLATION) 149 status |= SSI_SDR_WP_VIOLATION; 150 if (cardstatus & ERASE_PARAM) 151 status |= SSI_SDR_ERASE_PARAM; 152 if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE)) 153 status |= SSI_SDR_OUT_OF_RANGE; 154 /* ??? Don't know what Parameter Error really means, so 155 assume it's set if the second byte is nonzero. */ 156 if (status & 0xff) 157 status |= SSI_SDR_PARAMETER_ERROR; 158 s->response[0] = status >> 8; 159 s->response[1] = status; 160 DPRINTF("Card status 0x%02x\n", status); 161 } 162 s->mode = SSI_SD_RESPONSE; 163 s->response_pos = 0; 164 } else { 165 s->cmdarg[s->arglen++] = val; 166 } 167 return 0xff; 168 case SSI_SD_RESPONSE: 169 if (s->stopping) { 170 s->stopping = 0; 171 return 0xff; 172 } 173 if (s->response_pos < s->arglen) { 174 DPRINTF("Response 0x%02x\n", s->response[s->response_pos]); 175 return s->response[s->response_pos++]; 176 } 177 if (sd_data_ready(s->sd)) { 178 DPRINTF("Data read\n"); 179 s->mode = SSI_SD_DATA_START; 180 } else { 181 DPRINTF("End of command\n"); 182 s->mode = SSI_SD_CMD; 183 } 184 return 0xff; 185 case SSI_SD_DATA_START: 186 DPRINTF("Start read block\n"); 187 s->mode = SSI_SD_DATA_READ; 188 return 0xfe; 189 case SSI_SD_DATA_READ: 190 val = sd_read_data(s->sd); 191 if (!sd_data_ready(s->sd)) { 192 DPRINTF("Data read end\n"); 193 s->mode = SSI_SD_CMD; 194 } 195 return val; 196 } 197 /* Should never happen. */ 198 return 0xff; 199 } 200 201 static void ssi_sd_save(QEMUFile *f, void *opaque) 202 { 203 SSISlave *ss = SSI_SLAVE(opaque); 204 ssi_sd_state *s = (ssi_sd_state *)opaque; 205 int i; 206 207 qemu_put_be32(f, s->mode); 208 qemu_put_be32(f, s->cmd); 209 for (i = 0; i < 4; i++) 210 qemu_put_be32(f, s->cmdarg[i]); 211 for (i = 0; i < 5; i++) 212 qemu_put_be32(f, s->response[i]); 213 qemu_put_be32(f, s->arglen); 214 qemu_put_be32(f, s->response_pos); 215 qemu_put_be32(f, s->stopping); 216 217 qemu_put_be32(f, ss->cs); 218 } 219 220 static int ssi_sd_load(QEMUFile *f, void *opaque, int version_id) 221 { 222 SSISlave *ss = SSI_SLAVE(opaque); 223 ssi_sd_state *s = (ssi_sd_state *)opaque; 224 int i; 225 226 if (version_id != 1) 227 return -EINVAL; 228 229 s->mode = qemu_get_be32(f); 230 s->cmd = qemu_get_be32(f); 231 for (i = 0; i < 4; i++) 232 s->cmdarg[i] = qemu_get_be32(f); 233 for (i = 0; i < 5; i++) 234 s->response[i] = qemu_get_be32(f); 235 s->arglen = qemu_get_be32(f); 236 if (s->mode == SSI_SD_CMDARG && 237 (s->arglen < 0 || s->arglen >= ARRAY_SIZE(s->cmdarg))) { 238 return -EINVAL; 239 } 240 s->response_pos = qemu_get_be32(f); 241 s->stopping = qemu_get_be32(f); 242 if (s->mode == SSI_SD_RESPONSE && 243 (s->response_pos < 0 || s->response_pos >= ARRAY_SIZE(s->response) || 244 (!s->stopping && s->arglen > ARRAY_SIZE(s->response)))) { 245 return -EINVAL; 246 } 247 248 ss->cs = qemu_get_be32(f); 249 250 return 0; 251 } 252 253 static void ssi_sd_realize(SSISlave *d, Error **errp) 254 { 255 DeviceState *dev = DEVICE(d); 256 ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, d); 257 DriveInfo *dinfo; 258 259 s->mode = SSI_SD_CMD; 260 /* FIXME use a qdev drive property instead of drive_get_next() */ 261 dinfo = drive_get_next(IF_SD); 262 s->sd = sd_init(dinfo ? blk_by_legacy_dinfo(dinfo) : NULL, true); 263 if (s->sd == NULL) { 264 error_setg(errp, "Device initialization failed."); 265 return; 266 } 267 register_savevm(dev, "ssi_sd", -1, 1, ssi_sd_save, ssi_sd_load, s); 268 } 269 270 static void ssi_sd_class_init(ObjectClass *klass, void *data) 271 { 272 SSISlaveClass *k = SSI_SLAVE_CLASS(klass); 273 274 k->realize = ssi_sd_realize; 275 k->transfer = ssi_sd_transfer; 276 k->cs_polarity = SSI_CS_LOW; 277 } 278 279 static const TypeInfo ssi_sd_info = { 280 .name = "ssi-sd", 281 .parent = TYPE_SSI_SLAVE, 282 .instance_size = sizeof(ssi_sd_state), 283 .class_init = ssi_sd_class_init, 284 }; 285 286 static void ssi_sd_register_types(void) 287 { 288 type_register_static(&ssi_sd_info); 289 } 290 291 type_init(ssi_sd_register_types) 292