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