hw/sd/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 "qemu/osdep.h"
  14 #include "sysemu/blockdev.h"
  15 #include "hw/ssi/ssi.h"
  16 #include "hw/sd/sd.h"
  17 #include "qapi/error.h"
  18
  19 //#define DEBUG_SSI_SD 1
  20
  21 #ifdef DEBUG_SSI_SD
  22 #define DPRINTF(fmt, ...) \
  23 do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0)
  24 #define BADF(fmt, ...) \
  25 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  26 #else
  27 #define DPRINTF(fmt, ...) do {} while(0)
  28 #define BADF(fmt, ...) \
  29 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__);} while (0)
  30 #endif
  31
  32 typedef enum {
  33     SSI_SD_CMD = 0,
  34     SSI_SD_CMDARG,
  35     SSI_SD_RESPONSE,
  36     SSI_SD_DATA_START,
  37     SSI_SD_DATA_READ,
  38 } ssi_sd_mode;
  39
  40 typedef struct {
  41     SSISlave ssidev;
  42     uint32_t mode;
  43     int cmd;
  44     uint8_t cmdarg[4];
  45     uint8_t response[5];
  46     int32_t arglen;
  47     int32_t response_pos;
  48     int32_t stopping;
  49     SDBus sdbus;
  50 } ssi_sd_state;
  51
  52 #define TYPE_SSI_SD "ssi-sd"
  53 #define SSI_SD(obj) OBJECT_CHECK(ssi_sd_state, (obj), TYPE_SSI_SD)
  54
  55 /* State word bits.  */
  56 #define SSI_SDR_LOCKED          0x0001
  57 #define SSI_SDR_WP_ERASE        0x0002
  58 #define SSI_SDR_ERROR           0x0004
  59 #define SSI_SDR_CC_ERROR        0x0008
  60 #define SSI_SDR_ECC_FAILED      0x0010
  61 #define SSI_SDR_WP_VIOLATION    0x0020
  62 #define SSI_SDR_ERASE_PARAM     0x0040
  63 #define SSI_SDR_OUT_OF_RANGE    0x0080
  64 #define SSI_SDR_IDLE            0x0100
  65 #define SSI_SDR_ERASE_RESET     0x0200
  66 #define SSI_SDR_ILLEGAL_COMMAND 0x0400
  67 #define SSI_SDR_COM_CRC_ERROR   0x0800
  68 #define SSI_SDR_ERASE_SEQ_ERROR 0x1000
  69 #define SSI_SDR_ADDRESS_ERROR   0x2000
  70 #define SSI_SDR_PARAMETER_ERROR 0x4000
  71
  72 static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
  73 {
  74     ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev);
  75
  76     /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data.  */
  77     if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
  78         s->mode = SSI_SD_CMD;
  79         /* There must be at least one byte delay before the card responds.  */
  80         s->stopping = 1;
  81     }
  82
  83     switch (s->mode) {
  84     case SSI_SD_CMD:
  85         if (val == 0xff) {
  86             DPRINTF("NULL command\n");
  87             return 0xff;
  88         }
  89         s->cmd = val & 0x3f;
  90         s->mode = SSI_SD_CMDARG;
  91         s->arglen = 0;
  92         return 0xff;
  93     case SSI_SD_CMDARG:
  94         if (s->arglen == 4) {
  95             SDRequest request;
  96             uint8_t longresp[16];
  97             /* FIXME: Check CRC.  */
  98             request.cmd = s->cmd;
  99             request.arg = ldl_be_p(s->cmdarg);
 100             DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
 101             s->arglen = sdbus_do_command(&s->sdbus, &request, longresp);
 102             if (s->arglen <= 0) {
 103                 s->arglen = 1;
 104                 s->response[0] = 4;
 105                 DPRINTF("SD command failed\n");
 106             } else if (s->cmd == 58) {
 107                 /* CMD58 returns R3 response (OCR)  */
 108                 DPRINTF("Returned OCR\n");
 109                 s->arglen = 5;
 110                 s->response[0] = 1;
 111                 memcpy(&s->response[1], longresp, 4);
 112             } else if (s->arglen != 4) {
 113                 BADF("Unexpected response to cmd %d\n", s->cmd);
 114                 /* Illegal command is about as near as we can get.  */
 115                 s->arglen = 1;
 116                 s->response[0] = 4;
 117             } else {
 118                 /* All other commands return status.  */
 119                 uint32_t cardstatus;
 120                 uint16_t status;
 121                 /* CMD13 returns a 2-byte statuse work. Other commands
 122                    only return the first byte.  */
 123                 s->arglen = (s->cmd == 13) ? 2 : 1;
 124                 cardstatus = ldl_be_p(longresp);
 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 (sdbus_data_ready(&s->sdbus)) {
 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 = sdbus_read_data(&s->sdbus);
 191         if (!sdbus_data_ready(&s->sdbus)) {
 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 int ssi_sd_post_load(void *opaque, int version_id)
 202 {
 203     ssi_sd_state *s = (ssi_sd_state *)opaque;
 204
 205     if (s->mode > SSI_SD_DATA_READ) {
 206         return -EINVAL;
 207     }
 208     if (s->mode == SSI_SD_CMDARG &&
 209         (s->arglen < 0 || s->arglen >= ARRAY_SIZE(s->cmdarg))) {
 210         return -EINVAL;
 211     }
 212     if (s->mode == SSI_SD_RESPONSE &&
 213         (s->response_pos < 0 || s->response_pos >= ARRAY_SIZE(s->response) ||
 214         (!s->stopping && s->arglen > ARRAY_SIZE(s->response)))) {
 215         return -EINVAL;
 216     }
 217
 218     return 0;
 219 }
 220
 221 static const VMStateDescription vmstate_ssi_sd = {
 222     .name = "ssi_sd",
 223     .version_id = 2,
 224     .minimum_version_id = 2,
 225     .post_load = ssi_sd_post_load,
 226     .fields = (VMStateField []) {
 227         VMSTATE_UINT32(mode, ssi_sd_state),
 228         VMSTATE_INT32(cmd, ssi_sd_state),
 229         VMSTATE_UINT8_ARRAY(cmdarg, ssi_sd_state, 4),
 230         VMSTATE_UINT8_ARRAY(response, ssi_sd_state, 5),
 231         VMSTATE_INT32(arglen, ssi_sd_state),
 232         VMSTATE_INT32(response_pos, ssi_sd_state),
 233         VMSTATE_INT32(stopping, ssi_sd_state),
 234         VMSTATE_SSI_SLAVE(ssidev, ssi_sd_state),
 235         VMSTATE_END_OF_LIST()
 236     }
 237 };
 238
 239 static void ssi_sd_realize(SSISlave *d, Error **errp)
 240 {
 241     ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, d);
 242     DeviceState *carddev;
 243     DriveInfo *dinfo;
 244     Error *err = NULL;
 245
 246     qbus_create_inplace(&s->sdbus, sizeof(s->sdbus), TYPE_SD_BUS,
 247                         DEVICE(d), "sd-bus");
 248
 249     /* Create and plug in the sd card */
 250     /* FIXME use a qdev drive property instead of drive_get_next() */
 251     dinfo = drive_get_next(IF_SD);
 252     carddev = qdev_create(&s->sdbus.qbus, TYPE_SD_CARD);
 253     if (dinfo) {
 254         qdev_prop_set_drive(carddev, "drive", blk_by_legacy_dinfo(dinfo), &err);
 255     }
 256     object_property_set_bool(OBJECT(carddev), true, "spi", &err);
 257     object_property_set_bool(OBJECT(carddev), true, "realized", &err);
 258     if (err) {
 259         error_setg(errp, "failed to init SD card: %s", error_get_pretty(err));
 260         return;
 261     }
 262 }
 263
 264 static void ssi_sd_reset(DeviceState *dev)
 265 {
 266     ssi_sd_state *s = SSI_SD(dev);
 267
 268     s->mode = SSI_SD_CMD;
 269     s->cmd = 0;
 270     memset(s->cmdarg, 0, sizeof(s->cmdarg));
 271     memset(s->response, 0, sizeof(s->response));
 272     s->arglen = 0;
 273     s->response_pos = 0;
 274     s->stopping = 0;
 275 }
 276
 277 static void ssi_sd_class_init(ObjectClass *klass, void *data)
 278 {
 279     DeviceClass *dc = DEVICE_CLASS(klass);
 280     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
 281
 282     k->realize = ssi_sd_realize;
 283     k->transfer = ssi_sd_transfer;
 284     k->cs_polarity = SSI_CS_LOW;
 285     dc->vmsd = &vmstate_ssi_sd;
 286     dc->reset = ssi_sd_reset;
 287 }
 288
 289 static const TypeInfo ssi_sd_info = {
 290     .name          = TYPE_SSI_SD,
 291     .parent        = TYPE_SSI_SLAVE,
 292     .instance_size = sizeof(ssi_sd_state),
 293     .class_init    = ssi_sd_class_init,
 294 };
 295
 296 static void ssi_sd_register_types(void)
 297 {
 298     type_register_static(&ssi_sd_info);
 299 }
 300
 301 type_init(ssi_sd_register_types)