hw/ssi-sd.c

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