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 "migration/vmstate.h"
  17 #include "hw/qdev-properties.h"
  18 #include "hw/sd/sd.h"
  19 #include "qapi/error.h"
  20 #include "qemu/module.h"
  21
  22 //#define DEBUG_SSI_SD 1
  23
  24 #ifdef DEBUG_SSI_SD
  25 #define DPRINTF(fmt, ...) \
  26 do { printf("ssi_sd: " fmt , ## __VA_ARGS__); } while (0)
  27 #define BADF(fmt, ...) \
  28 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)
  29 #else
  30 #define DPRINTF(fmt, ...) do {} while(0)
  31 #define BADF(fmt, ...) \
  32 do { fprintf(stderr, "ssi_sd: error: " fmt , ## __VA_ARGS__);} while (0)
  33 #endif
  34
  35 typedef enum {
  36     SSI_SD_CMD = 0,
  37     SSI_SD_CMDARG,
  38     SSI_SD_RESPONSE,
  39     SSI_SD_DATA_START,
  40     SSI_SD_DATA_READ,
  41 } ssi_sd_mode;
  42
  43 typedef struct {
  44     SSISlave ssidev;
  45     uint32_t mode;
  46     int cmd;
  47     uint8_t cmdarg[4];
  48     uint8_t response[5];
  49     int32_t arglen;
  50     int32_t response_pos;
  51     int32_t stopping;
  52     SDBus sdbus;
  53 } ssi_sd_state;
  54
  55 #define TYPE_SSI_SD "ssi-sd"
  56 #define SSI_SD(obj) OBJECT_CHECK(ssi_sd_state, (obj), TYPE_SSI_SD)
  57
  58 /* State word bits.  */
  59 #define SSI_SDR_LOCKED          0x0001
  60 #define SSI_SDR_WP_ERASE        0x0002
  61 #define SSI_SDR_ERROR           0x0004
  62 #define SSI_SDR_CC_ERROR        0x0008
  63 #define SSI_SDR_ECC_FAILED      0x0010
  64 #define SSI_SDR_WP_VIOLATION    0x0020
  65 #define SSI_SDR_ERASE_PARAM     0x0040
  66 #define SSI_SDR_OUT_OF_RANGE    0x0080
  67 #define SSI_SDR_IDLE            0x0100
  68 #define SSI_SDR_ERASE_RESET     0x0200
  69 #define SSI_SDR_ILLEGAL_COMMAND 0x0400
  70 #define SSI_SDR_COM_CRC_ERROR   0x0800
  71 #define SSI_SDR_ERASE_SEQ_ERROR 0x1000
  72 #define SSI_SDR_ADDRESS_ERROR   0x2000
  73 #define SSI_SDR_PARAMETER_ERROR 0x4000
  74
  75 static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
  76 {
  77     ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev);
  78
  79     /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data.  */
  80     if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
  81         s->mode = SSI_SD_CMD;
  82         /* There must be at least one byte delay before the card responds.  */
  83         s->stopping = 1;
  84     }
  85
  86     switch (s->mode) {
  87     case SSI_SD_CMD:
  88         if (val == 0xff) {
  89             DPRINTF("NULL command\n");
  90             return 0xff;
  91         }
  92         s->cmd = val & 0x3f;
  93         s->mode = SSI_SD_CMDARG;
  94         s->arglen = 0;
  95         return 0xff;
  96     case SSI_SD_CMDARG:
  97         if (s->arglen == 4) {
  98             SDRequest request;
  99             uint8_t longresp[16];
 100             /* FIXME: Check CRC.  */
 101             request.cmd = s->cmd;
 102             request.arg = ldl_be_p(s->cmdarg);
 103             DPRINTF("CMD%d arg 0x%08x\n", s->cmd, request.arg);
 104             s->arglen = sdbus_do_command(&s->sdbus, &request, longresp);
 105             if (s->arglen <= 0) {
 106                 s->arglen = 1;
 107                 s->response[0] = 4;
 108                 DPRINTF("SD command failed\n");
 109             } else if (s->cmd == 58) {
 110                 /* CMD58 returns R3 response (OCR)  */
 111                 DPRINTF("Returned OCR\n");
 112                 s->arglen = 5;
 113                 s->response[0] = 1;
 114                 memcpy(&s->response[1], longresp, 4);
 115             } else if (s->arglen != 4) {
 116                 BADF("Unexpected response to cmd %d\n", s->cmd);
 117                 /* Illegal command is about as near as we can get.  */
 118                 s->arglen = 1;
 119                 s->response[0] = 4;
 120             } else {
 121                 /* All other commands return status.  */
 122                 uint32_t cardstatus;
 123                 uint16_t status;
 124                 /* CMD13 returns a 2-byte statuse work. Other commands
 125                    only return the first byte.  */
 126                 s->arglen = (s->cmd == 13) ? 2 : 1;
 127                 cardstatus = ldl_be_p(longresp);
 128                 status = 0;
 129                 if (((cardstatus >> 9) & 0xf) < 4)
 130                     status |= SSI_SDR_IDLE;
 131                 if (cardstatus & ERASE_RESET)
 132                     status |= SSI_SDR_ERASE_RESET;
 133                 if (cardstatus & ILLEGAL_COMMAND)
 134                     status |= SSI_SDR_ILLEGAL_COMMAND;
 135                 if (cardstatus & COM_CRC_ERROR)
 136                     status |= SSI_SDR_COM_CRC_ERROR;
 137                 if (cardstatus & ERASE_SEQ_ERROR)
 138                     status |= SSI_SDR_ERASE_SEQ_ERROR;
 139                 if (cardstatus & ADDRESS_ERROR)
 140                     status |= SSI_SDR_ADDRESS_ERROR;
 141                 if (cardstatus & CARD_IS_LOCKED)
 142                     status |= SSI_SDR_LOCKED;
 143                 if (cardstatus & (LOCK_UNLOCK_FAILED | WP_ERASE_SKIP))
 144                     status |= SSI_SDR_WP_ERASE;
 145                 if (cardstatus & SD_ERROR)
 146                     status |= SSI_SDR_ERROR;
 147                 if (cardstatus & CC_ERROR)
 148                     status |= SSI_SDR_CC_ERROR;
 149                 if (cardstatus & CARD_ECC_FAILED)
 150                     status |= SSI_SDR_ECC_FAILED;
 151                 if (cardstatus & WP_VIOLATION)
 152                     status |= SSI_SDR_WP_VIOLATION;
 153                 if (cardstatus & ERASE_PARAM)
 154                     status |= SSI_SDR_ERASE_PARAM;
 155                 if (cardstatus & (OUT_OF_RANGE | CID_CSD_OVERWRITE))
 156                     status |= SSI_SDR_OUT_OF_RANGE;
 157                 /* ??? Don't know what Parameter Error really means, so
 158                    assume it's set if the second byte is nonzero.  */
 159                 if (status & 0xff)
 160                     status |= SSI_SDR_PARAMETER_ERROR;
 161                 s->response[0] = status >> 8;
 162                 s->response[1] = status;
 163                 DPRINTF("Card status 0x%02x\n", status);
 164             }
 165             s->mode = SSI_SD_RESPONSE;
 166             s->response_pos = 0;
 167         } else {
 168             s->cmdarg[s->arglen++] = val;
 169         }
 170         return 0xff;
 171     case SSI_SD_RESPONSE:
 172         if (s->stopping) {
 173             s->stopping = 0;
 174             return 0xff;
 175         }
 176         if (s->response_pos < s->arglen) {
 177             DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
 178             return s->response[s->response_pos++];
 179         }
 180         if (sdbus_data_ready(&s->sdbus)) {
 181             DPRINTF("Data read\n");
 182             s->mode = SSI_SD_DATA_START;
 183         } else {
 184             DPRINTF("End of command\n");
 185             s->mode = SSI_SD_CMD;
 186         }
 187         return 0xff;
 188     case SSI_SD_DATA_START:
 189         DPRINTF("Start read block\n");
 190         s->mode = SSI_SD_DATA_READ;
 191         return 0xfe;
 192     case SSI_SD_DATA_READ:
 193         val = sdbus_read_data(&s->sdbus);
 194         if (!sdbus_data_ready(&s->sdbus)) {
 195             DPRINTF("Data read end\n");
 196             s->mode = SSI_SD_CMD;
 197         }
 198         return val;
 199     }
 200     /* Should never happen.  */
 201     return 0xff;
 202 }
 203
 204 static int ssi_sd_post_load(void *opaque, int version_id)
 205 {
 206     ssi_sd_state *s = (ssi_sd_state *)opaque;
 207
 208     if (s->mode > SSI_SD_DATA_READ) {
 209         return -EINVAL;
 210     }
 211     if (s->mode == SSI_SD_CMDARG &&
 212         (s->arglen < 0 || s->arglen >= ARRAY_SIZE(s->cmdarg))) {
 213         return -EINVAL;
 214     }
 215     if (s->mode == SSI_SD_RESPONSE &&
 216         (s->response_pos < 0 || s->response_pos >= ARRAY_SIZE(s->response) ||
 217         (!s->stopping && s->arglen > ARRAY_SIZE(s->response)))) {
 218         return -EINVAL;
 219     }
 220
 221     return 0;
 222 }
 223
 224 static const VMStateDescription vmstate_ssi_sd = {
 225     .name = "ssi_sd",
 226     .version_id = 2,
 227     .minimum_version_id = 2,
 228     .post_load = ssi_sd_post_load,
 229     .fields = (VMStateField []) {
 230         VMSTATE_UINT32(mode, ssi_sd_state),
 231         VMSTATE_INT32(cmd, ssi_sd_state),
 232         VMSTATE_UINT8_ARRAY(cmdarg, ssi_sd_state, 4),
 233         VMSTATE_UINT8_ARRAY(response, ssi_sd_state, 5),
 234         VMSTATE_INT32(arglen, ssi_sd_state),
 235         VMSTATE_INT32(response_pos, ssi_sd_state),
 236         VMSTATE_INT32(stopping, ssi_sd_state),
 237         VMSTATE_SSI_SLAVE(ssidev, ssi_sd_state),
 238         VMSTATE_END_OF_LIST()
 239     }
 240 };
 241
 242 static void ssi_sd_realize(SSISlave *d, Error **errp)
 243 {
 244     ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, d);
 245     DeviceState *carddev;
 246     DriveInfo *dinfo;
 247     Error *err = NULL;
 248
 249     qbus_create_inplace(&s->sdbus, sizeof(s->sdbus), TYPE_SD_BUS,
 250                         DEVICE(d), "sd-bus");
 251
 252     /* Create and plug in the sd card */
 253     /* FIXME use a qdev drive property instead of drive_get_next() */
 254     dinfo = drive_get_next(IF_SD);
 255     carddev = qdev_create(BUS(&s->sdbus), TYPE_SD_CARD);
 256     if (dinfo) {
 257         qdev_prop_set_drive(carddev, "drive", blk_by_legacy_dinfo(dinfo), &err);
 258     }
 259     object_property_set_bool(OBJECT(carddev), true, "spi", &err);
 260     object_property_set_bool(OBJECT(carddev), true, "realized", &err);
 261     if (err) {
 262         error_setg(errp, "failed to init SD card: %s", error_get_pretty(err));
 263         return;
 264     }
 265 }
 266
 267 static void ssi_sd_reset(DeviceState *dev)
 268 {
 269     ssi_sd_state *s = SSI_SD(dev);
 270
 271     s->mode = SSI_SD_CMD;
 272     s->cmd = 0;
 273     memset(s->cmdarg, 0, sizeof(s->cmdarg));
 274     memset(s->response, 0, sizeof(s->response));
 275     s->arglen = 0;
 276     s->response_pos = 0;
 277     s->stopping = 0;
 278 }
 279
 280 static void ssi_sd_class_init(ObjectClass *klass, void *data)
 281 {
 282     DeviceClass *dc = DEVICE_CLASS(klass);
 283     SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
 284
 285     k->realize = ssi_sd_realize;
 286     k->transfer = ssi_sd_transfer;
 287     k->cs_polarity = SSI_CS_LOW;
 288     dc->vmsd = &vmstate_ssi_sd;
 289     dc->reset = ssi_sd_reset;
 290     /* Reason: init() method uses drive_get_next() */
 291     dc->user_creatable = false;
 292 }
 293
 294 static const TypeInfo ssi_sd_info = {
 295     .name          = TYPE_SSI_SD,
 296     .parent        = TYPE_SSI_SLAVE,
 297     .instance_size = sizeof(ssi_sd_state),
 298     .class_init    = ssi_sd_class_init,
 299 };
 300
 301 static void ssi_sd_register_types(void)
 302 {
 303     type_register_static(&ssi_sd_info);
 304 }
 305
 306 type_init(ssi_sd_register_types)