drivers/staging/greybus/sdio.c

   1 /*
   2  * SD/MMC Greybus driver.
   3  *
   4  * Copyright 2014-2015 Google Inc.
   5  * Copyright 2014-2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/mmc/core.h>
  12 #include <linux/mmc/host.h>
  13 #include <linux/mmc/mmc.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/workqueue.h>
  16
  17 #include "greybus.h"
  18 #include "gbphy.h"
  19
  20 struct gb_sdio_host {
  21         struct gb_connection    *connection;
  22         struct gbphy_device     *gbphy_dev;
  23         struct mmc_host         *mmc;
  24         struct mmc_request      *mrq;
  25         struct mutex            lock;   /* lock for this host */
  26         size_t                  data_max;
  27         spinlock_t              xfer;   /* lock to cancel ongoing transfer */
  28         bool                    xfer_stop;
  29         struct workqueue_struct *mrq_workqueue;
  30         struct work_struct      mrqwork;
  31         u8                      queued_events;
  32         bool                    removed;
  33         bool                    card_present;
  34         bool                    read_only;
  35 };
  36
  37
  38 #define GB_SDIO_RSP_R1_R5_R6_R7 (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
  39                                  GB_SDIO_RSP_OPCODE)
  40 #define GB_SDIO_RSP_R3_R4       (GB_SDIO_RSP_PRESENT)
  41 #define GB_SDIO_RSP_R2          (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
  42                                  GB_SDIO_RSP_136)
  43 #define GB_SDIO_RSP_R1B         (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
  44                                  GB_SDIO_RSP_OPCODE | GB_SDIO_RSP_BUSY)
  45
  46 /* kernel vdd starts at 0x80 and we need to translate to greybus ones 0x01 */
  47 #define GB_SDIO_VDD_SHIFT       8
  48
  49 #ifndef MMC_CAP2_CORE_RUNTIME_PM
  50 #define MMC_CAP2_CORE_RUNTIME_PM        0
  51 #endif
  52
  53 static inline bool single_op(struct mmc_command *cmd)
  54 {
  55         u32 opcode = cmd->opcode;
  56
  57         return opcode == MMC_WRITE_BLOCK ||
  58                opcode == MMC_READ_SINGLE_BLOCK;
  59 }
  60
  61 static void _gb_sdio_set_host_caps(struct gb_sdio_host *host, u32 r)
  62 {
  63         u32 caps = 0;
  64         u32 caps2 = 0;
  65
  66         caps = ((r & GB_SDIO_CAP_NONREMOVABLE) ? MMC_CAP_NONREMOVABLE : 0) |
  67                 ((r & GB_SDIO_CAP_4_BIT_DATA) ? MMC_CAP_4_BIT_DATA : 0) |
  68                 ((r & GB_SDIO_CAP_8_BIT_DATA) ? MMC_CAP_8_BIT_DATA : 0) |
  69                 ((r & GB_SDIO_CAP_MMC_HS) ? MMC_CAP_MMC_HIGHSPEED : 0) |
  70                 ((r & GB_SDIO_CAP_SD_HS) ? MMC_CAP_SD_HIGHSPEED : 0) |
  71                 ((r & GB_SDIO_CAP_ERASE) ? MMC_CAP_ERASE : 0) |
  72                 ((r & GB_SDIO_CAP_1_2V_DDR) ? MMC_CAP_1_2V_DDR : 0) |
  73                 ((r & GB_SDIO_CAP_1_8V_DDR) ? MMC_CAP_1_8V_DDR : 0) |
  74                 ((r & GB_SDIO_CAP_POWER_OFF_CARD) ? MMC_CAP_POWER_OFF_CARD : 0) |
  75                 ((r & GB_SDIO_CAP_UHS_SDR12) ? MMC_CAP_UHS_SDR12 : 0) |
  76                 ((r & GB_SDIO_CAP_UHS_SDR25) ? MMC_CAP_UHS_SDR25 : 0) |
  77                 ((r & GB_SDIO_CAP_UHS_SDR50) ? MMC_CAP_UHS_SDR50 : 0) |
  78                 ((r & GB_SDIO_CAP_UHS_SDR104) ? MMC_CAP_UHS_SDR104 : 0) |
  79                 ((r & GB_SDIO_CAP_UHS_DDR50) ? MMC_CAP_UHS_DDR50 : 0) |
  80                 ((r & GB_SDIO_CAP_DRIVER_TYPE_A) ? MMC_CAP_DRIVER_TYPE_A : 0) |
  81                 ((r & GB_SDIO_CAP_DRIVER_TYPE_C) ? MMC_CAP_DRIVER_TYPE_C : 0) |
  82                 ((r & GB_SDIO_CAP_DRIVER_TYPE_D) ? MMC_CAP_DRIVER_TYPE_D : 0);
  83
  84         caps2 = ((r & GB_SDIO_CAP_HS200_1_2V) ? MMC_CAP2_HS200_1_2V_SDR : 0) |
  85                 ((r & GB_SDIO_CAP_HS400_1_2V) ? MMC_CAP2_HS400_1_2V : 0) |
  86                 ((r & GB_SDIO_CAP_HS400_1_8V) ? MMC_CAP2_HS400_1_8V : 0) |
  87                 ((r & GB_SDIO_CAP_HS200_1_8V) ? MMC_CAP2_HS200_1_8V_SDR : 0);
  88
  89         host->mmc->caps = caps;
  90         host->mmc->caps2 = caps2 | MMC_CAP2_CORE_RUNTIME_PM;
  91
  92         if (caps & MMC_CAP_NONREMOVABLE)
  93                 host->card_present = true;
  94 }
  95
  96 static u32 _gb_sdio_get_host_ocr(u32 ocr)
  97 {
  98         return (((ocr & GB_SDIO_VDD_165_195) ? MMC_VDD_165_195 : 0) |
  99                 ((ocr & GB_SDIO_VDD_20_21) ? MMC_VDD_20_21 : 0) |
 100                 ((ocr & GB_SDIO_VDD_21_22) ? MMC_VDD_21_22 : 0) |
 101                 ((ocr & GB_SDIO_VDD_22_23) ? MMC_VDD_22_23 : 0) |
 102                 ((ocr & GB_SDIO_VDD_23_24) ? MMC_VDD_23_24 : 0) |
 103                 ((ocr & GB_SDIO_VDD_24_25) ? MMC_VDD_24_25 : 0) |
 104                 ((ocr & GB_SDIO_VDD_25_26) ? MMC_VDD_25_26 : 0) |
 105                 ((ocr & GB_SDIO_VDD_26_27) ? MMC_VDD_26_27 : 0) |
 106                 ((ocr & GB_SDIO_VDD_27_28) ? MMC_VDD_27_28 : 0) |
 107                 ((ocr & GB_SDIO_VDD_28_29) ? MMC_VDD_28_29 : 0) |
 108                 ((ocr & GB_SDIO_VDD_29_30) ? MMC_VDD_29_30 : 0) |
 109                 ((ocr & GB_SDIO_VDD_30_31) ? MMC_VDD_30_31 : 0) |
 110                 ((ocr & GB_SDIO_VDD_31_32) ? MMC_VDD_31_32 : 0) |
 111                 ((ocr & GB_SDIO_VDD_32_33) ? MMC_VDD_32_33 : 0) |
 112                 ((ocr & GB_SDIO_VDD_33_34) ? MMC_VDD_33_34 : 0) |
 113                 ((ocr & GB_SDIO_VDD_34_35) ? MMC_VDD_34_35 : 0) |
 114                 ((ocr & GB_SDIO_VDD_35_36) ? MMC_VDD_35_36 : 0)
 115                 );
 116 }
 117
 118 static int gb_sdio_get_caps(struct gb_sdio_host *host)
 119 {
 120         struct gb_sdio_get_caps_response response;
 121         struct mmc_host *mmc = host->mmc;
 122         u16 data_max;
 123         u32 blksz;
 124         u32 ocr;
 125         u32 r;
 126         int ret;
 127
 128         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_GET_CAPABILITIES,
 129                                 NULL, 0, &response, sizeof(response));
 130         if (ret < 0)
 131                 return ret;
 132         r = le32_to_cpu(response.caps);
 133
 134         _gb_sdio_set_host_caps(host, r);
 135
 136         /* get the max block size that could fit our payload */
 137         data_max = gb_operation_get_payload_size_max(host->connection);
 138         data_max = min(data_max - sizeof(struct gb_sdio_transfer_request),
 139                        data_max - sizeof(struct gb_sdio_transfer_response));
 140
 141         blksz = min_t(u16, le16_to_cpu(response.max_blk_size), data_max);
 142         blksz = max_t(u32, 512, blksz);
 143
 144         mmc->max_blk_size = rounddown_pow_of_two(blksz);
 145         mmc->max_blk_count = le16_to_cpu(response.max_blk_count);
 146         host->data_max = data_max;
 147
 148         /* get ocr supported values */
 149         ocr = _gb_sdio_get_host_ocr(le32_to_cpu(response.ocr));
 150         mmc->ocr_avail = ocr;
 151         mmc->ocr_avail_sdio = mmc->ocr_avail;
 152         mmc->ocr_avail_sd = mmc->ocr_avail;
 153         mmc->ocr_avail_mmc = mmc->ocr_avail;
 154
 155         /* get frequency range values */
 156         mmc->f_min = le32_to_cpu(response.f_min);
 157         mmc->f_max = le32_to_cpu(response.f_max);
 158
 159         return 0;
 160 }
 161
 162 static void _gb_queue_event(struct gb_sdio_host *host, u8 event)
 163 {
 164         if (event & GB_SDIO_CARD_INSERTED)
 165                 host->queued_events &= ~GB_SDIO_CARD_REMOVED;
 166         else if (event & GB_SDIO_CARD_REMOVED)
 167                 host->queued_events &= ~GB_SDIO_CARD_INSERTED;
 168
 169         host->queued_events |= event;
 170 }
 171
 172 static int _gb_sdio_process_events(struct gb_sdio_host *host, u8 event)
 173 {
 174         u8 state_changed = 0;
 175
 176         if (event & GB_SDIO_CARD_INSERTED) {
 177                 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 178                         return 0;
 179                 if (host->card_present)
 180                         return 0;
 181                 host->card_present = true;
 182                 state_changed = 1;
 183         }
 184
 185         if (event & GB_SDIO_CARD_REMOVED) {
 186                 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 187                         return 0;
 188                 if (!(host->card_present))
 189                         return 0;
 190                 host->card_present = false;
 191                 state_changed = 1;
 192         }
 193
 194         if (event & GB_SDIO_WP)
 195                 host->read_only = true;
 196
 197         if (state_changed) {
 198                 dev_info(mmc_dev(host->mmc), "card %s now event\n",
 199                          (host->card_present ?  "inserted" : "removed"));
 200                 mmc_detect_change(host->mmc, 0);
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int gb_sdio_request_handler(struct gb_operation *op)
 207 {
 208         struct gb_sdio_host *host = gb_connection_get_data(op->connection);
 209         struct gb_message *request;
 210         struct gb_sdio_event_request *payload;
 211         u8 type = op->type;
 212         int ret =  0;
 213         u8 event;
 214
 215         if (type != GB_SDIO_TYPE_EVENT) {
 216                 dev_err(mmc_dev(host->mmc),
 217                         "unsupported unsolicited event: %u\n", type);
 218                 return -EINVAL;
 219         }
 220
 221         request = op->request;
 222
 223         if (request->payload_size < sizeof(*payload)) {
 224                 dev_err(mmc_dev(host->mmc), "wrong event size received (%zu < %zu)\n",
 225                         request->payload_size, sizeof(*payload));
 226                 return -EINVAL;
 227         }
 228
 229         payload = request->payload;
 230         event = payload->event;
 231
 232         if (host->removed)
 233                 _gb_queue_event(host, event);
 234         else
 235                 ret = _gb_sdio_process_events(host, event);
 236
 237         return ret;
 238 }
 239
 240 static int gb_sdio_set_ios(struct gb_sdio_host *host,
 241                            struct gb_sdio_set_ios_request *request)
 242 {
 243         int ret;
 244
 245         ret = gbphy_runtime_get_sync(host->gbphy_dev);
 246         if (ret)
 247                 return ret;
 248
 249         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_SET_IOS, request,
 250                                 sizeof(*request), NULL, 0);
 251
 252         gbphy_runtime_put_autosuspend(host->gbphy_dev);
 253
 254         return ret;
 255 }
 256
 257 static int _gb_sdio_send(struct gb_sdio_host *host, struct mmc_data *data,
 258                          size_t len, u16 nblocks, off_t skip)
 259 {
 260         struct gb_sdio_transfer_request *request;
 261         struct gb_sdio_transfer_response *response;
 262         struct gb_operation *operation;
 263         struct scatterlist *sg = data->sg;
 264         unsigned int sg_len = data->sg_len;
 265         size_t copied;
 266         u16 send_blksz;
 267         u16 send_blocks;
 268         int ret;
 269
 270         WARN_ON(len > host->data_max);
 271
 272         operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
 273                                         len + sizeof(*request),
 274                                         sizeof(*response), GFP_KERNEL);
 275         if (!operation)
 276                 return -ENOMEM;
 277
 278         request = operation->request->payload;
 279         request->data_flags = (data->flags >> 8);
 280         request->data_blocks = cpu_to_le16(nblocks);
 281         request->data_blksz = cpu_to_le16(data->blksz);
 282
 283         copied = sg_pcopy_to_buffer(sg, sg_len, &request->data[0], len, skip);
 284
 285         if (copied != len) {
 286                 ret = -EINVAL;
 287                 goto err_put_operation;
 288         }
 289
 290         ret = gb_operation_request_send_sync(operation);
 291         if (ret < 0)
 292                 goto err_put_operation;
 293
 294         response = operation->response->payload;
 295
 296         send_blocks = le16_to_cpu(response->data_blocks);
 297         send_blksz = le16_to_cpu(response->data_blksz);
 298
 299         if (len != send_blksz * send_blocks) {
 300                 dev_err(mmc_dev(host->mmc), "send: size received: %zu != %d\n",
 301                         len, send_blksz * send_blocks);
 302                 ret = -EINVAL;
 303         }
 304
 305 err_put_operation:
 306         gb_operation_put(operation);
 307
 308         return ret;
 309 }
 310
 311 static int _gb_sdio_recv(struct gb_sdio_host *host, struct mmc_data *data,
 312                          size_t len, u16 nblocks, off_t skip)
 313 {
 314         struct gb_sdio_transfer_request *request;
 315         struct gb_sdio_transfer_response *response;
 316         struct gb_operation *operation;
 317         struct scatterlist *sg = data->sg;
 318         unsigned int sg_len = data->sg_len;
 319         size_t copied;
 320         u16 recv_blksz;
 321         u16 recv_blocks;
 322         int ret;
 323
 324         WARN_ON(len > host->data_max);
 325
 326         operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
 327                                         sizeof(*request),
 328                                         len + sizeof(*response), GFP_KERNEL);
 329         if (!operation)
 330                 return -ENOMEM;
 331
 332         request = operation->request->payload;
 333         request->data_flags = (data->flags >> 8);
 334         request->data_blocks = cpu_to_le16(nblocks);
 335         request->data_blksz = cpu_to_le16(data->blksz);
 336
 337         ret = gb_operation_request_send_sync(operation);
 338         if (ret < 0)
 339                 goto err_put_operation;
 340
 341         response = operation->response->payload;
 342         recv_blocks = le16_to_cpu(response->data_blocks);
 343         recv_blksz = le16_to_cpu(response->data_blksz);
 344
 345         if (len != recv_blksz * recv_blocks) {
 346                 dev_err(mmc_dev(host->mmc), "recv: size received: %d != %zu\n",
 347                         recv_blksz * recv_blocks, len);
 348                 ret = -EINVAL;
 349                 goto err_put_operation;
 350         }
 351
 352         copied = sg_pcopy_from_buffer(sg, sg_len, &response->data[0], len,
 353                                       skip);
 354         if (copied != len)
 355                 ret = -EINVAL;
 356
 357 err_put_operation:
 358         gb_operation_put(operation);
 359
 360         return ret;
 361 }
 362
 363 static int gb_sdio_transfer(struct gb_sdio_host *host, struct mmc_data *data)
 364 {
 365         size_t left, len;
 366         off_t skip = 0;
 367         int ret = 0;
 368         u16 nblocks;
 369
 370         if (single_op(data->mrq->cmd) && data->blocks > 1) {
 371                 ret = -ETIMEDOUT;
 372                 goto out;
 373         }
 374
 375         left = data->blksz * data->blocks;
 376
 377         while (left) {
 378                 /* check is a stop transmission is pending */
 379                 spin_lock(&host->xfer);
 380                 if (host->xfer_stop) {
 381                         host->xfer_stop = false;
 382                         spin_unlock(&host->xfer);
 383                         ret = -EINTR;
 384                         goto out;
 385                 }
 386                 spin_unlock(&host->xfer);
 387                 len = min(left, host->data_max);
 388                 nblocks = len / data->blksz;
 389                 len = nblocks * data->blksz;
 390
 391                 if (data->flags & MMC_DATA_READ) {
 392                         ret = _gb_sdio_recv(host, data, len, nblocks, skip);
 393                         if (ret < 0)
 394                                 goto out;
 395                 } else {
 396                         ret = _gb_sdio_send(host, data, len, nblocks, skip);
 397                         if (ret < 0)
 398                                 goto out;
 399                 }
 400                 data->bytes_xfered += len;
 401                 left -= len;
 402                 skip += len;
 403         }
 404
 405 out:
 406         data->error = ret;
 407         return ret;
 408 }
 409
 410 static int gb_sdio_command(struct gb_sdio_host *host, struct mmc_command *cmd)
 411 {
 412         struct gb_sdio_command_request request = {0};
 413         struct gb_sdio_command_response response;
 414         struct mmc_data *data = host->mrq->data;
 415         u8 cmd_flags;
 416         u8 cmd_type;
 417         int i;
 418         int ret;
 419
 420         switch (mmc_resp_type(cmd)) {
 421         case MMC_RSP_NONE:
 422                 cmd_flags = GB_SDIO_RSP_NONE;
 423                 break;
 424         case MMC_RSP_R1:
 425                 cmd_flags = GB_SDIO_RSP_R1_R5_R6_R7;
 426                 break;
 427         case MMC_RSP_R1B:
 428                 cmd_flags = GB_SDIO_RSP_R1B;
 429                 break;
 430         case MMC_RSP_R2:
 431                 cmd_flags = GB_SDIO_RSP_R2;
 432                 break;
 433         case MMC_RSP_R3:
 434                 cmd_flags = GB_SDIO_RSP_R3_R4;
 435                 break;
 436         default:
 437                 dev_err(mmc_dev(host->mmc), "cmd flag invalid 0x%04x\n",
 438                         mmc_resp_type(cmd));
 439                 ret = -EINVAL;
 440                 goto out;
 441         }
 442
 443         switch (mmc_cmd_type(cmd)) {
 444         case MMC_CMD_BC:
 445                 cmd_type = GB_SDIO_CMD_BC;
 446                 break;
 447         case MMC_CMD_BCR:
 448                 cmd_type = GB_SDIO_CMD_BCR;
 449                 break;
 450         case MMC_CMD_AC:
 451                 cmd_type = GB_SDIO_CMD_AC;
 452                 break;
 453         case MMC_CMD_ADTC:
 454                 cmd_type = GB_SDIO_CMD_ADTC;
 455                 break;
 456         default:
 457                 dev_err(mmc_dev(host->mmc), "cmd type invalid 0x%04x\n",
 458                         mmc_cmd_type(cmd));
 459                 ret = -EINVAL;
 460                 goto out;
 461         }
 462
 463         request.cmd = cmd->opcode;
 464         request.cmd_flags = cmd_flags;
 465         request.cmd_type = cmd_type;
 466         request.cmd_arg = cpu_to_le32(cmd->arg);
 467         /* some controllers need to know at command time data details */
 468         if (data) {
 469                 request.data_blocks = cpu_to_le16(data->blocks);
 470                 request.data_blksz = cpu_to_le16(data->blksz);
 471         }
 472
 473         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_COMMAND,
 474                                 &request, sizeof(request), &response,
 475                                 sizeof(response));
 476         if (ret < 0)
 477                 goto out;
 478
 479         /* no response expected */
 480         if (cmd_flags == GB_SDIO_RSP_NONE)
 481                 goto out;
 482
 483         /* long response expected */
 484         if (cmd_flags & GB_SDIO_RSP_R2)
 485                 for (i = 0; i < 4; i++)
 486                         cmd->resp[i] = le32_to_cpu(response.resp[i]);
 487         else
 488                 cmd->resp[0] = le32_to_cpu(response.resp[0]);
 489
 490 out:
 491         cmd->error = ret;
 492         return ret;
 493 }
 494
 495 static void gb_sdio_mrq_work(struct work_struct *work)
 496 {
 497         struct gb_sdio_host *host;
 498         struct mmc_request *mrq;
 499         int ret;
 500
 501         host = container_of(work, struct gb_sdio_host, mrqwork);
 502
 503         ret = gbphy_runtime_get_sync(host->gbphy_dev);
 504         if (ret)
 505                 return;
 506
 507         mutex_lock(&host->lock);
 508         mrq = host->mrq;
 509         if (!mrq) {
 510                 mutex_unlock(&host->lock);
 511                 gbphy_runtime_put_autosuspend(host->gbphy_dev);
 512                 dev_err(mmc_dev(host->mmc), "mmc request is NULL");
 513                 return;
 514         }
 515
 516         if (host->removed) {
 517                 mrq->cmd->error = -ESHUTDOWN;
 518                 goto done;
 519         }
 520
 521         if (mrq->sbc) {
 522                 ret = gb_sdio_command(host, mrq->sbc);
 523                 if (ret < 0)
 524                         goto done;
 525         }
 526
 527         ret = gb_sdio_command(host, mrq->cmd);
 528         if (ret < 0)
 529                 goto done;
 530
 531         if (mrq->data) {
 532                 ret = gb_sdio_transfer(host, mrq->data);
 533                 if (ret < 0)
 534                         goto done;
 535         }
 536
 537         if (mrq->stop) {
 538                 ret = gb_sdio_command(host, mrq->stop);
 539                 if (ret < 0)
 540                         goto done;
 541         }
 542
 543 done:
 544         host->mrq = NULL;
 545         mutex_unlock(&host->lock);
 546         mmc_request_done(host->mmc, mrq);
 547         gbphy_runtime_put_autosuspend(host->gbphy_dev);
 548 }
 549
 550 static void gb_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 551 {
 552         struct gb_sdio_host *host = mmc_priv(mmc);
 553         struct mmc_command *cmd = mrq->cmd;
 554
 555         /* Check if it is a cancel to ongoing transfer */
 556         if (cmd->opcode == MMC_STOP_TRANSMISSION) {
 557                 spin_lock(&host->xfer);
 558                 host->xfer_stop = true;
 559                 spin_unlock(&host->xfer);
 560         }
 561
 562         mutex_lock(&host->lock);
 563
 564         WARN_ON(host->mrq);
 565         host->mrq = mrq;
 566
 567         if (host->removed) {
 568                 mrq->cmd->error = -ESHUTDOWN;
 569                 goto out;
 570         }
 571         if (!host->card_present) {
 572                 mrq->cmd->error = -ENOMEDIUM;
 573                 goto out;
 574         }
 575
 576         queue_work(host->mrq_workqueue, &host->mrqwork);
 577
 578         mutex_unlock(&host->lock);
 579         return;
 580
 581 out:
 582         host->mrq = NULL;
 583         mutex_unlock(&host->lock);
 584         mmc_request_done(mmc, mrq);
 585 }
 586
 587 static void gb_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 588 {
 589         struct gb_sdio_host *host = mmc_priv(mmc);
 590         struct gb_sdio_set_ios_request request;
 591         int ret;
 592         u8 power_mode;
 593         u8 bus_width;
 594         u8 timing;
 595         u8 signal_voltage;
 596         u8 drv_type;
 597         u32 vdd = 0;
 598
 599         mutex_lock(&host->lock);
 600         request.clock = cpu_to_le32(ios->clock);
 601
 602         if (ios->vdd)
 603                 vdd = 1 << (ios->vdd - GB_SDIO_VDD_SHIFT);
 604         request.vdd = cpu_to_le32(vdd);
 605
 606         request.bus_mode = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN ?
 607                             GB_SDIO_BUSMODE_OPENDRAIN :
 608                             GB_SDIO_BUSMODE_PUSHPULL);
 609
 610         switch (ios->power_mode) {
 611         case MMC_POWER_OFF:
 612         default:
 613                 power_mode = GB_SDIO_POWER_OFF;
 614                 break;
 615         case MMC_POWER_UP:
 616                 power_mode = GB_SDIO_POWER_UP;
 617                 break;
 618         case MMC_POWER_ON:
 619                 power_mode = GB_SDIO_POWER_ON;
 620                 break;
 621         case MMC_POWER_UNDEFINED:
 622                 power_mode = GB_SDIO_POWER_UNDEFINED;
 623                 break;
 624         }
 625         request.power_mode = power_mode;
 626
 627         switch (ios->bus_width) {
 628         case MMC_BUS_WIDTH_1:
 629                 bus_width = GB_SDIO_BUS_WIDTH_1;
 630                 break;
 631         case MMC_BUS_WIDTH_4:
 632         default:
 633                 bus_width = GB_SDIO_BUS_WIDTH_4;
 634                 break;
 635         case MMC_BUS_WIDTH_8:
 636                 bus_width = GB_SDIO_BUS_WIDTH_8;
 637                 break;
 638         }
 639         request.bus_width = bus_width;
 640
 641         switch (ios->timing) {
 642         case MMC_TIMING_LEGACY:
 643         default:
 644                 timing = GB_SDIO_TIMING_LEGACY;
 645                 break;
 646         case MMC_TIMING_MMC_HS:
 647                 timing = GB_SDIO_TIMING_MMC_HS;
 648                 break;
 649         case MMC_TIMING_SD_HS:
 650                 timing = GB_SDIO_TIMING_SD_HS;
 651                 break;
 652         case MMC_TIMING_UHS_SDR12:
 653                 timing = GB_SDIO_TIMING_UHS_SDR12;
 654                 break;
 655         case MMC_TIMING_UHS_SDR25:
 656                 timing = GB_SDIO_TIMING_UHS_SDR25;
 657                 break;
 658         case MMC_TIMING_UHS_SDR50:
 659                 timing = GB_SDIO_TIMING_UHS_SDR50;
 660                 break;
 661         case MMC_TIMING_UHS_SDR104:
 662                 timing = GB_SDIO_TIMING_UHS_SDR104;
 663                 break;
 664         case MMC_TIMING_UHS_DDR50:
 665                 timing = GB_SDIO_TIMING_UHS_DDR50;
 666                 break;
 667         case MMC_TIMING_MMC_DDR52:
 668                 timing = GB_SDIO_TIMING_MMC_DDR52;
 669                 break;
 670         case MMC_TIMING_MMC_HS200:
 671                 timing = GB_SDIO_TIMING_MMC_HS200;
 672                 break;
 673         case MMC_TIMING_MMC_HS400:
 674                 timing = GB_SDIO_TIMING_MMC_HS400;
 675                 break;
 676         }
 677         request.timing = timing;
 678
 679         switch (ios->signal_voltage) {
 680         case MMC_SIGNAL_VOLTAGE_330:
 681                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_330;
 682                 break;
 683         case MMC_SIGNAL_VOLTAGE_180:
 684         default:
 685                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_180;
 686                 break;
 687         case MMC_SIGNAL_VOLTAGE_120:
 688                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_120;
 689                 break;
 690         }
 691         request.signal_voltage = signal_voltage;
 692
 693         switch (ios->drv_type) {
 694         case MMC_SET_DRIVER_TYPE_A:
 695                 drv_type = GB_SDIO_SET_DRIVER_TYPE_A;
 696                 break;
 697         case MMC_SET_DRIVER_TYPE_C:
 698                 drv_type = GB_SDIO_SET_DRIVER_TYPE_C;
 699                 break;
 700         case MMC_SET_DRIVER_TYPE_D:
 701                 drv_type = GB_SDIO_SET_DRIVER_TYPE_D;
 702                 break;
 703         case MMC_SET_DRIVER_TYPE_B:
 704         default:
 705                 drv_type = GB_SDIO_SET_DRIVER_TYPE_B;
 706                 break;
 707         }
 708         request.drv_type = drv_type;
 709
 710         ret = gb_sdio_set_ios(host, &request);
 711         if (ret < 0)
 712                 goto out;
 713
 714         memcpy(&mmc->ios, ios, sizeof(mmc->ios));
 715
 716 out:
 717         mutex_unlock(&host->lock);
 718 }
 719
 720 static int gb_mmc_get_ro(struct mmc_host *mmc)
 721 {
 722         struct gb_sdio_host *host = mmc_priv(mmc);
 723
 724         mutex_lock(&host->lock);
 725         if (host->removed) {
 726                 mutex_unlock(&host->lock);
 727                 return -ESHUTDOWN;
 728         }
 729         mutex_unlock(&host->lock);
 730
 731         return host->read_only;
 732 }
 733
 734 static int gb_mmc_get_cd(struct mmc_host *mmc)
 735 {
 736         struct gb_sdio_host *host = mmc_priv(mmc);
 737
 738         mutex_lock(&host->lock);
 739         if (host->removed) {
 740                 mutex_unlock(&host->lock);
 741                 return -ESHUTDOWN;
 742         }
 743         mutex_unlock(&host->lock);
 744
 745         return host->card_present;
 746 }
 747
 748 static int gb_mmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 749 {
 750         return 0;
 751 }
 752
 753 static const struct mmc_host_ops gb_sdio_ops = {
 754         .request        = gb_mmc_request,
 755         .set_ios        = gb_mmc_set_ios,
 756         .get_ro         = gb_mmc_get_ro,
 757         .get_cd         = gb_mmc_get_cd,
 758         .start_signal_voltage_switch    = gb_mmc_switch_voltage,
 759 };
 760
 761 static int gb_sdio_probe(struct gbphy_device *gbphy_dev,
 762                          const struct gbphy_device_id *id)
 763 {
 764         struct gb_connection *connection;
 765         struct mmc_host *mmc;
 766         struct gb_sdio_host *host;
 767         int ret = 0;
 768
 769         mmc = mmc_alloc_host(sizeof(*host), &gbphy_dev->dev);
 770         if (!mmc)
 771                 return -ENOMEM;
 772
 773         connection = gb_connection_create(gbphy_dev->bundle,
 774                                           le16_to_cpu(gbphy_dev->cport_desc->id),
 775                                           gb_sdio_request_handler);
 776         if (IS_ERR(connection)) {
 777                 ret = PTR_ERR(connection);
 778                 goto exit_mmc_free;
 779         }
 780
 781         host = mmc_priv(mmc);
 782         host->mmc = mmc;
 783         host->removed = true;
 784
 785         host->connection = connection;
 786         gb_connection_set_data(connection, host);
 787         host->gbphy_dev = gbphy_dev;
 788         gb_gbphy_set_data(gbphy_dev, host);
 789
 790         ret = gb_connection_enable_tx(connection);
 791         if (ret)
 792                 goto exit_connection_destroy;
 793
 794         ret = gb_sdio_get_caps(host);
 795         if (ret < 0)
 796                 goto exit_connection_disable;
 797
 798         mmc->ops = &gb_sdio_ops;
 799
 800         mmc->max_segs = host->mmc->max_blk_count;
 801
 802         /* for now we make a map 1:1 between max request and segment size */
 803         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
 804         mmc->max_seg_size = mmc->max_req_size;
 805
 806         mutex_init(&host->lock);
 807         spin_lock_init(&host->xfer);
 808         host->mrq_workqueue = alloc_workqueue("mmc-%s", 0, 1,
 809                                               dev_name(&gbphy_dev->dev));
 810         if (!host->mrq_workqueue) {
 811                 ret = -ENOMEM;
 812                 goto exit_connection_disable;
 813         }
 814         INIT_WORK(&host->mrqwork, gb_sdio_mrq_work);
 815
 816         ret = gb_connection_enable(connection);
 817         if (ret)
 818                 goto exit_wq_destroy;
 819
 820         ret = mmc_add_host(mmc);
 821         if (ret < 0)
 822                 goto exit_wq_destroy;
 823         host->removed = false;
 824         ret = _gb_sdio_process_events(host, host->queued_events);
 825         host->queued_events = 0;
 826
 827         gbphy_runtime_put_autosuspend(gbphy_dev);
 828
 829         return ret;
 830
 831 exit_wq_destroy:
 832         destroy_workqueue(host->mrq_workqueue);
 833 exit_connection_disable:
 834         gb_connection_disable(connection);
 835 exit_connection_destroy:
 836         gb_connection_destroy(connection);
 837 exit_mmc_free:
 838         mmc_free_host(mmc);
 839
 840         return ret;
 841 }
 842
 843 static void gb_sdio_remove(struct gbphy_device *gbphy_dev)
 844 {
 845         struct gb_sdio_host *host = gb_gbphy_get_data(gbphy_dev);
 846         struct gb_connection *connection = host->connection;
 847         struct mmc_host *mmc;
 848         int ret;
 849
 850         ret = gbphy_runtime_get_sync(gbphy_dev);
 851         if (ret)
 852                 gbphy_runtime_get_noresume(gbphy_dev);
 853
 854         mutex_lock(&host->lock);
 855         host->removed = true;
 856         mmc = host->mmc;
 857         gb_connection_set_data(connection, NULL);
 858         mutex_unlock(&host->lock);
 859
 860         flush_workqueue(host->mrq_workqueue);
 861         destroy_workqueue(host->mrq_workqueue);
 862         gb_connection_disable_rx(connection);
 863         mmc_remove_host(mmc);
 864         gb_connection_disable(connection);
 865         gb_connection_destroy(connection);
 866         mmc_free_host(mmc);
 867 }
 868
 869 static const struct gbphy_device_id gb_sdio_id_table[] = {
 870         { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SDIO) },
 871         { },
 872 };
 873 MODULE_DEVICE_TABLE(gbphy, gb_sdio_id_table);
 874
 875 static struct gbphy_driver sdio_driver = {
 876         .name           = "sdio",
 877         .probe          = gb_sdio_probe,
 878         .remove         = gb_sdio_remove,
 879         .id_table       = gb_sdio_id_table,
 880 };
 881
 882 module_gbphy_driver(sdio_driver);
 883 MODULE_LICENSE("GPL v2");