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 static inline bool single_op(struct mmc_command *cmd)
  50 {
  51         uint32_t opcode = cmd->opcode;
  52
  53         return opcode == MMC_WRITE_BLOCK ||
  54                opcode == MMC_READ_SINGLE_BLOCK;
  55 }
  56
  57 static void _gb_sdio_set_host_caps(struct gb_sdio_host *host, u32 r)
  58 {
  59         u32 caps = 0;
  60         u32 caps2 = 0;
  61
  62         caps = ((r & GB_SDIO_CAP_NONREMOVABLE) ? MMC_CAP_NONREMOVABLE : 0) |
  63                 ((r & GB_SDIO_CAP_4_BIT_DATA) ? MMC_CAP_4_BIT_DATA : 0) |
  64                 ((r & GB_SDIO_CAP_8_BIT_DATA) ? MMC_CAP_8_BIT_DATA : 0) |
  65                 ((r & GB_SDIO_CAP_MMC_HS) ? MMC_CAP_MMC_HIGHSPEED : 0) |
  66                 ((r & GB_SDIO_CAP_SD_HS) ? MMC_CAP_SD_HIGHSPEED : 0) |
  67                 ((r & GB_SDIO_CAP_ERASE) ? MMC_CAP_ERASE : 0) |
  68                 ((r & GB_SDIO_CAP_1_2V_DDR) ? MMC_CAP_1_2V_DDR : 0) |
  69                 ((r & GB_SDIO_CAP_1_8V_DDR) ? MMC_CAP_1_8V_DDR : 0) |
  70                 ((r & GB_SDIO_CAP_POWER_OFF_CARD) ? MMC_CAP_POWER_OFF_CARD : 0) |
  71                 ((r & GB_SDIO_CAP_UHS_SDR12) ? MMC_CAP_UHS_SDR12 : 0) |
  72                 ((r & GB_SDIO_CAP_UHS_SDR25) ? MMC_CAP_UHS_SDR25 : 0) |
  73                 ((r & GB_SDIO_CAP_UHS_SDR50) ? MMC_CAP_UHS_SDR50 : 0) |
  74                 ((r & GB_SDIO_CAP_UHS_SDR104) ? MMC_CAP_UHS_SDR104 : 0) |
  75                 ((r & GB_SDIO_CAP_UHS_DDR50) ? MMC_CAP_UHS_DDR50 : 0) |
  76                 ((r & GB_SDIO_CAP_DRIVER_TYPE_A) ? MMC_CAP_DRIVER_TYPE_A : 0) |
  77                 ((r & GB_SDIO_CAP_DRIVER_TYPE_C) ? MMC_CAP_DRIVER_TYPE_C : 0) |
  78                 ((r & GB_SDIO_CAP_DRIVER_TYPE_D) ? MMC_CAP_DRIVER_TYPE_D : 0);
  79
  80         caps2 = ((r & GB_SDIO_CAP_HS200_1_2V) ? MMC_CAP2_HS200_1_2V_SDR : 0) |
  81 #ifdef MMC_HS400_SUPPORTED
  82                 ((r & GB_SDIO_CAP_HS400_1_2V) ? MMC_CAP2_HS400_1_2V : 0) |
  83                 ((r & GB_SDIO_CAP_HS400_1_8V) ? MMC_CAP2_HS400_1_8V : 0) |
  84 #endif
  85                 ((r & GB_SDIO_CAP_HS200_1_8V) ? MMC_CAP2_HS200_1_8V_SDR : 0);
  86
  87         host->mmc->caps = caps;
  88         host->mmc->caps2 = caps2 | MMC_CAP2_CORE_RUNTIME_PM;
  89
  90         if (caps & MMC_CAP_NONREMOVABLE)
  91                 host->card_present = true;
  92 }
  93
  94 static u32 _gb_sdio_get_host_ocr(u32 ocr)
  95 {
  96         return (((ocr & GB_SDIO_VDD_165_195) ? MMC_VDD_165_195 : 0) |
  97                 ((ocr & GB_SDIO_VDD_20_21) ? MMC_VDD_20_21 : 0) |
  98                 ((ocr & GB_SDIO_VDD_21_22) ? MMC_VDD_21_22 : 0) |
  99                 ((ocr & GB_SDIO_VDD_22_23) ? MMC_VDD_22_23 : 0) |
 100                 ((ocr & GB_SDIO_VDD_23_24) ? MMC_VDD_23_24 : 0) |
 101                 ((ocr & GB_SDIO_VDD_24_25) ? MMC_VDD_24_25 : 0) |
 102                 ((ocr & GB_SDIO_VDD_25_26) ? MMC_VDD_25_26 : 0) |
 103                 ((ocr & GB_SDIO_VDD_26_27) ? MMC_VDD_26_27 : 0) |
 104                 ((ocr & GB_SDIO_VDD_27_28) ? MMC_VDD_27_28 : 0) |
 105                 ((ocr & GB_SDIO_VDD_28_29) ? MMC_VDD_28_29 : 0) |
 106                 ((ocr & GB_SDIO_VDD_29_30) ? MMC_VDD_29_30 : 0) |
 107                 ((ocr & GB_SDIO_VDD_30_31) ? MMC_VDD_30_31 : 0) |
 108                 ((ocr & GB_SDIO_VDD_31_32) ? MMC_VDD_31_32 : 0) |
 109                 ((ocr & GB_SDIO_VDD_32_33) ? MMC_VDD_32_33 : 0) |
 110                 ((ocr & GB_SDIO_VDD_33_34) ? MMC_VDD_33_34 : 0) |
 111                 ((ocr & GB_SDIO_VDD_34_35) ? MMC_VDD_34_35 : 0) |
 112                 ((ocr & GB_SDIO_VDD_35_36) ? MMC_VDD_35_36 : 0)
 113                 );
 114 }
 115
 116 static int gb_sdio_get_caps(struct gb_sdio_host *host)
 117 {
 118         struct gb_sdio_get_caps_response response;
 119         struct mmc_host *mmc = host->mmc;
 120         u16 data_max;
 121         u32 blksz;
 122         u32 ocr;
 123         u32 r;
 124         int ret;
 125
 126         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_GET_CAPABILITIES,
 127                                 NULL, 0, &response, sizeof(response));
 128         if (ret < 0)
 129                 return ret;
 130         r = le32_to_cpu(response.caps);
 131
 132         _gb_sdio_set_host_caps(host, r);
 133
 134         /* get the max block size that could fit our payload */
 135         data_max = gb_operation_get_payload_size_max(host->connection);
 136         data_max = min(data_max - sizeof(struct gb_sdio_transfer_request),
 137                        data_max - sizeof(struct gb_sdio_transfer_response));
 138
 139         blksz = min(le16_to_cpu(response.max_blk_size), data_max);
 140         blksz = max_t(u32, 512, blksz);
 141
 142         mmc->max_blk_size = rounddown_pow_of_two(blksz);
 143         mmc->max_blk_count = le16_to_cpu(response.max_blk_count);
 144         host->data_max = data_max;
 145
 146         /* get ocr supported values */
 147         ocr = _gb_sdio_get_host_ocr(le32_to_cpu(response.ocr));
 148         mmc->ocr_avail = ocr;
 149         mmc->ocr_avail_sdio = mmc->ocr_avail;
 150         mmc->ocr_avail_sd = mmc->ocr_avail;
 151         mmc->ocr_avail_mmc = mmc->ocr_avail;
 152
 153         /* get frequency range values */
 154         mmc->f_min = le32_to_cpu(response.f_min);
 155         mmc->f_max = le32_to_cpu(response.f_max);
 156
 157         return 0;
 158 }
 159
 160 static void _gb_queue_event(struct gb_sdio_host *host, u8 event)
 161 {
 162         if (event & GB_SDIO_CARD_INSERTED)
 163                 host->queued_events &= ~GB_SDIO_CARD_REMOVED;
 164         else if (event & GB_SDIO_CARD_REMOVED)
 165                 host->queued_events &= ~GB_SDIO_CARD_INSERTED;
 166
 167         host->queued_events |= event;
 168 }
 169
 170 static int _gb_sdio_process_events(struct gb_sdio_host *host, u8 event)
 171 {
 172         u8 state_changed = 0;
 173
 174         if (event & GB_SDIO_CARD_INSERTED) {
 175                 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 176                         return 0;
 177                 if (host->card_present)
 178                         return 0;
 179                 host->card_present = true;
 180                 state_changed = 1;
 181         }
 182
 183         if (event & GB_SDIO_CARD_REMOVED) {
 184                 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
 185                         return 0;
 186                 if (!(host->card_present))
 187                         return 0;
 188                 host->card_present = false;
 189                 state_changed = 1;
 190         }
 191
 192         if (event & GB_SDIO_WP) {
 193                 host->read_only = true;
 194         }
 195
 196         if (state_changed) {
 197                 dev_info(mmc_dev(host->mmc), "card %s now event\n",
 198                          (host->card_present ?  "inserted" : "removed"));
 199                 mmc_detect_change(host->mmc, 0);
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int gb_sdio_request_handler(struct gb_operation *op)
 206 {
 207         struct gb_sdio_host *host = gb_connection_get_data(op->connection);
 208         struct gb_message *request;
 209         struct gb_sdio_event_request *payload;
 210         u8 type = op->type;
 211         int ret =  0;
 212         u8 event;
 213
 214         if (type != GB_SDIO_TYPE_EVENT) {
 215                 dev_err(mmc_dev(host->mmc),
 216                         "unsupported unsolicited event: %u\n", type);
 217                 return -EINVAL;
 218         }
 219
 220         request = op->request;
 221
 222         if (request->payload_size < sizeof(*payload)) {
 223                 dev_err(mmc_dev(host->mmc), "wrong event size received (%zu < %zu)\n",
 224                         request->payload_size, sizeof(*payload));
 225                 return -EINVAL;
 226         }
 227
 228         payload = request->payload;
 229         event = payload->event;
 230
 231         if (host->removed)
 232                 _gb_queue_event(host, event);
 233         else
 234                 ret = _gb_sdio_process_events(host, event);
 235
 236         return ret;
 237 }
 238
 239 static int gb_sdio_set_ios(struct gb_sdio_host *host,
 240                            struct gb_sdio_set_ios_request *request)
 241 {
 242         int ret;
 243
 244         ret = gbphy_runtime_get_sync(host->gbphy_dev);
 245         if (ret)
 246                 return ret;
 247
 248         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_SET_IOS, request,
 249                                 sizeof(*request), NULL, 0);
 250
 251         gbphy_runtime_put_autosuspend(host->gbphy_dev);
 252
 253         return ret;
 254 }
 255
 256 static int _gb_sdio_send(struct gb_sdio_host *host, struct mmc_data *data,
 257                          size_t len, u16 nblocks, off_t skip)
 258 {
 259         struct gb_sdio_transfer_request *request;
 260         struct gb_sdio_transfer_response *response;
 261         struct gb_operation *operation;
 262         struct scatterlist *sg = data->sg;
 263         unsigned int sg_len = data->sg_len;
 264         size_t copied;
 265         u16 send_blksz;
 266         u16 send_blocks;
 267         int ret;
 268
 269         WARN_ON(len > host->data_max);
 270
 271         operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
 272                                         len + sizeof(*request),
 273                                         sizeof(*response), GFP_KERNEL);
 274         if (!operation)
 275                 return -ENOMEM;
 276
 277         request = operation->request->payload;
 278         request->data_flags = (data->flags >> 8);
 279         request->data_blocks = cpu_to_le16(nblocks);
 280         request->data_blksz = cpu_to_le16(data->blksz);
 281
 282         copied = sg_pcopy_to_buffer(sg, sg_len, &request->data[0], len, skip);
 283
 284         if (copied != len) {
 285                 ret = -EINVAL;
 286                 goto err_put_operation;
 287         }
 288
 289         ret = gb_operation_request_send_sync(operation);
 290         if (ret < 0)
 291                 goto err_put_operation;
 292
 293         response = operation->response->payload;
 294
 295         send_blocks = le16_to_cpu(response->data_blocks);
 296         send_blksz = le16_to_cpu(response->data_blksz);
 297
 298         if (len != send_blksz * send_blocks) {
 299                 dev_err(mmc_dev(host->mmc), "send: size received: %zu != %d\n",
 300                         len, send_blksz * send_blocks);
 301                 ret = -EINVAL;
 302         }
 303
 304 err_put_operation:
 305         gb_operation_put(operation);
 306
 307         return ret;
 308 }
 309
 310 static int _gb_sdio_recv(struct gb_sdio_host *host, struct mmc_data *data,
 311                          size_t len, u16 nblocks, off_t skip)
 312 {
 313         struct gb_sdio_transfer_request *request;
 314         struct gb_sdio_transfer_response *response;
 315         struct gb_operation *operation;
 316         struct scatterlist *sg = data->sg;
 317         unsigned int sg_len = data->sg_len;
 318         size_t copied;
 319         u16 recv_blksz;
 320         u16 recv_blocks;
 321         int ret;
 322
 323         WARN_ON(len > host->data_max);
 324
 325         operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
 326                                         sizeof(*request),
 327                                         len + sizeof(*response), GFP_KERNEL);
 328         if (!operation)
 329                 return -ENOMEM;
 330
 331         request = operation->request->payload;
 332         request->data_flags = (data->flags >> 8);
 333         request->data_blocks = cpu_to_le16(nblocks);
 334         request->data_blksz = cpu_to_le16(data->blksz);
 335
 336         ret = gb_operation_request_send_sync(operation);
 337         if (ret < 0)
 338                 goto err_put_operation;
 339
 340         response = operation->response->payload;
 341         recv_blocks = le16_to_cpu(response->data_blocks);
 342         recv_blksz = le16_to_cpu(response->data_blksz);
 343
 344         if (len != recv_blksz * recv_blocks) {
 345                 dev_err(mmc_dev(host->mmc), "recv: size received: %d != %zu\n",
 346                         recv_blksz * recv_blocks, len);
 347                 ret = -EINVAL;
 348                 goto err_put_operation;
 349         }
 350
 351         copied = sg_pcopy_from_buffer(sg, sg_len, &response->data[0], len,
 352                                       skip);
 353         if (copied != len)
 354                 ret = -EINVAL;
 355
 356 err_put_operation:
 357         gb_operation_put(operation);
 358
 359         return ret;
 360 }
 361
 362 static int gb_sdio_transfer(struct gb_sdio_host *host, struct mmc_data *data)
 363 {
 364         size_t left, len;
 365         off_t skip = 0;
 366         int ret = 0;
 367         u16 nblocks;
 368
 369         if (single_op(data->mrq->cmd) && data->blocks > 1) {
 370                 ret = -ETIMEDOUT;
 371                 goto out;
 372         }
 373
 374         left = data->blksz * data->blocks;
 375
 376         while (left) {
 377                 /* check is a stop transmission is pending */
 378                 spin_lock(&host->xfer);
 379                 if (host->xfer_stop) {
 380                         host->xfer_stop = false;
 381                         spin_unlock(&host->xfer);
 382                         ret = -EINTR;
 383                         goto out;
 384                 }
 385                 spin_unlock(&host->xfer);
 386                 len = min(left, host->data_max);
 387                 nblocks = len / data->blksz;
 388                 len = nblocks * data->blksz;
 389
 390                 if (data->flags & MMC_DATA_READ) {
 391                         ret = _gb_sdio_recv(host, data, len, nblocks, skip);
 392                         if (ret < 0)
 393                                 goto out;
 394                 } else {
 395                         ret = _gb_sdio_send(host, data, len, nblocks, skip);
 396                         if (ret < 0)
 397                                 goto out;
 398                 }
 399                 data->bytes_xfered += len;
 400                 left -= len;
 401                 skip += len;
 402         }
 403
 404 out:
 405         data->error = ret;
 406         return ret;
 407 }
 408
 409 static int gb_sdio_command(struct gb_sdio_host *host, struct mmc_command *cmd)
 410 {
 411         struct gb_sdio_command_request request = {0};
 412         struct gb_sdio_command_response response;
 413         struct mmc_data *data = host->mrq->data;
 414         u8 cmd_flags;
 415         u8 cmd_type;
 416         int i;
 417         int ret;
 418
 419         switch (mmc_resp_type(cmd)) {
 420         case MMC_RSP_NONE:
 421                 cmd_flags = GB_SDIO_RSP_NONE;
 422                 break;
 423         case MMC_RSP_R1:
 424                 cmd_flags = GB_SDIO_RSP_R1_R5_R6_R7;
 425                 break;
 426         case MMC_RSP_R1B:
 427                 cmd_flags = GB_SDIO_RSP_R1B;
 428                 break;
 429         case MMC_RSP_R2:
 430                 cmd_flags = GB_SDIO_RSP_R2;
 431                 break;
 432         case MMC_RSP_R3:
 433                 cmd_flags = GB_SDIO_RSP_R3_R4;
 434                 break;
 435         default:
 436                 dev_err(mmc_dev(host->mmc), "cmd flag invalid 0x%04x\n",
 437                         mmc_resp_type(cmd));
 438                 ret = -EINVAL;
 439                 goto out;
 440         }
 441
 442         switch (mmc_cmd_type(cmd)) {
 443         case MMC_CMD_BC:
 444                 cmd_type = GB_SDIO_CMD_BC;
 445                 break;
 446         case MMC_CMD_BCR:
 447                 cmd_type = GB_SDIO_CMD_BCR;
 448                 break;
 449         case MMC_CMD_AC:
 450                 cmd_type = GB_SDIO_CMD_AC;
 451                 break;
 452         case MMC_CMD_ADTC:
 453                 cmd_type = GB_SDIO_CMD_ADTC;
 454                 break;
 455         default:
 456                 dev_err(mmc_dev(host->mmc), "cmd type invalid 0x%04x\n",
 457                         mmc_cmd_type(cmd));
 458                 ret = -EINVAL;
 459                 goto out;
 460         }
 461
 462         request.cmd = cmd->opcode;
 463         request.cmd_flags = cmd_flags;
 464         request.cmd_type = cmd_type;
 465         request.cmd_arg = cpu_to_le32(cmd->arg);
 466         /* some controllers need to know at command time data details */
 467         if (data) {
 468                 request.data_blocks = cpu_to_le16(data->blocks);
 469                 request.data_blksz = cpu_to_le16(data->blksz);
 470         }
 471
 472         ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_COMMAND,
 473                                 &request, sizeof(request), &response,
 474                                 sizeof(response));
 475         if (ret < 0)
 476                 goto out;
 477
 478         /* no response expected */
 479         if (cmd_flags & GB_SDIO_RSP_NONE)
 480                 goto out;
 481
 482         /* long response expected */
 483         if (cmd_flags & GB_SDIO_RSP_R2)
 484                 for (i = 0; i < 4; i++)
 485                         cmd->resp[i] = le32_to_cpu(response.resp[i]);
 486         else
 487                 cmd->resp[0] = le32_to_cpu(response.resp[0]);
 488
 489 out:
 490         cmd->error = ret;
 491         return ret;
 492 }
 493
 494 static void gb_sdio_mrq_work(struct work_struct *work)
 495 {
 496         struct gb_sdio_host *host;
 497         struct mmc_request *mrq;
 498         int ret;
 499
 500         host = container_of(work, struct gb_sdio_host, mrqwork);
 501
 502         ret = gbphy_runtime_get_sync(host->gbphy_dev);
 503         if (ret)
 504                 return;
 505
 506         mutex_lock(&host->lock);
 507         mrq = host->mrq;
 508         if (!mrq) {
 509                 mutex_unlock(&host->lock);
 510                 gbphy_runtime_put_autosuspend(host->gbphy_dev);
 511                 dev_err(mmc_dev(host->mmc), "mmc request is NULL");
 512                 return;
 513         }
 514
 515         if (host->removed) {
 516                 mrq->cmd->error = -ESHUTDOWN;
 517                 goto done;
 518         }
 519
 520         if (mrq->sbc) {
 521                 ret = gb_sdio_command(host, mrq->sbc);
 522                 if (ret < 0)
 523                         goto done;
 524         }
 525
 526         ret = gb_sdio_command(host, mrq->cmd);
 527         if (ret < 0)
 528                 goto done;
 529
 530         if (mrq->data) {
 531                 ret = gb_sdio_transfer(host, mrq->data);
 532                 if (ret < 0)
 533                         goto done;
 534         }
 535
 536         if (mrq->stop) {
 537                 ret = gb_sdio_command(host, mrq->stop);
 538                 if (ret < 0)
 539                         goto done;
 540         }
 541
 542 done:
 543         host->mrq = NULL;
 544         mutex_unlock(&host->lock);
 545         mmc_request_done(host->mmc, mrq);
 546         gbphy_runtime_put_autosuspend(host->gbphy_dev);
 547 }
 548
 549 static void gb_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 550 {
 551         struct gb_sdio_host *host = mmc_priv(mmc);
 552         struct mmc_command *cmd = mrq->cmd;
 553
 554         /* Check if it is a cancel to ongoing transfer */
 555         if (cmd->opcode == MMC_STOP_TRANSMISSION) {
 556                 spin_lock(&host->xfer);
 557                 host->xfer_stop = true;
 558                 spin_unlock(&host->xfer);
 559         }
 560
 561         mutex_lock(&host->lock);
 562
 563         WARN_ON(host->mrq);
 564         host->mrq = mrq;
 565
 566         if (host->removed) {
 567                 mrq->cmd->error = -ESHUTDOWN;
 568                 goto out;
 569         }
 570         if (!host->card_present) {
 571                 mrq->cmd->error = -ENOMEDIUM;
 572                 goto out;
 573         }
 574
 575         queue_work(host->mrq_workqueue, &host->mrqwork);
 576
 577         mutex_unlock(&host->lock);
 578         return;
 579
 580 out:
 581         host->mrq = NULL;
 582         mutex_unlock(&host->lock);
 583         mmc_request_done(mmc, mrq);
 584 }
 585
 586 static void gb_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 587 {
 588         struct gb_sdio_host *host = mmc_priv(mmc);
 589         struct gb_sdio_set_ios_request request;
 590         int ret;
 591         u8 power_mode;
 592         u8 bus_width;
 593         u8 timing;
 594         u8 signal_voltage;
 595         u8 drv_type;
 596         u32 vdd = 0;
 597
 598         mutex_lock(&host->lock);
 599         request.clock = cpu_to_le32(ios->clock);
 600
 601         if (ios->vdd)
 602                 vdd = 1 << (ios->vdd - GB_SDIO_VDD_SHIFT);
 603         request.vdd = cpu_to_le32(vdd);
 604
 605         request.bus_mode = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN ?
 606                             GB_SDIO_BUSMODE_OPENDRAIN :
 607                             GB_SDIO_BUSMODE_PUSHPULL);
 608
 609         switch (ios->power_mode) {
 610         case MMC_POWER_OFF:
 611         default:
 612                 power_mode = GB_SDIO_POWER_OFF;
 613                 break;
 614         case MMC_POWER_UP:
 615                 power_mode = GB_SDIO_POWER_UP;
 616                 break;
 617         case MMC_POWER_ON:
 618                 power_mode = GB_SDIO_POWER_ON;
 619                 break;
 620 #ifdef MMC_POWER_UNDEFINED_SUPPORTED
 621         case MMC_POWER_UNDEFINED:
 622                 power_mode = GB_SDIO_POWER_UNDEFINED;
 623                 break;
 624 #endif
 625         }
 626         request.power_mode = power_mode;
 627
 628         switch (ios->bus_width) {
 629         case MMC_BUS_WIDTH_1:
 630                 bus_width = GB_SDIO_BUS_WIDTH_1;
 631                 break;
 632         case MMC_BUS_WIDTH_4:
 633         default:
 634                 bus_width = GB_SDIO_BUS_WIDTH_4;
 635                 break;
 636         case MMC_BUS_WIDTH_8:
 637                 bus_width = GB_SDIO_BUS_WIDTH_8;
 638                 break;
 639         }
 640         request.bus_width = bus_width;
 641
 642         switch (ios->timing) {
 643         case MMC_TIMING_LEGACY:
 644         default:
 645                 timing = GB_SDIO_TIMING_LEGACY;
 646                 break;
 647         case MMC_TIMING_MMC_HS:
 648                 timing = GB_SDIO_TIMING_MMC_HS;
 649                 break;
 650         case MMC_TIMING_SD_HS:
 651                 timing = GB_SDIO_TIMING_SD_HS;
 652                 break;
 653         case MMC_TIMING_UHS_SDR12:
 654                 timing = GB_SDIO_TIMING_UHS_SDR12;
 655                 break;
 656         case MMC_TIMING_UHS_SDR25:
 657                 timing = GB_SDIO_TIMING_UHS_SDR25;
 658                 break;
 659         case MMC_TIMING_UHS_SDR50:
 660                 timing = GB_SDIO_TIMING_UHS_SDR50;
 661                 break;
 662         case MMC_TIMING_UHS_SDR104:
 663                 timing = GB_SDIO_TIMING_UHS_SDR104;
 664                 break;
 665         case MMC_TIMING_UHS_DDR50:
 666                 timing = GB_SDIO_TIMING_UHS_DDR50;
 667                 break;
 668 #ifdef MMC_DDR52_DEFINED
 669         case MMC_TIMING_MMC_DDR52:
 670                 timing = GB_SDIO_TIMING_MMC_DDR52;
 671                 break;
 672 #endif
 673         case MMC_TIMING_MMC_HS200:
 674                 timing = GB_SDIO_TIMING_MMC_HS200;
 675                 break;
 676 #ifdef MMC_HS400_SUPPORTED
 677         case MMC_TIMING_MMC_HS400:
 678                 timing = GB_SDIO_TIMING_MMC_HS400;
 679                 break;
 680 #endif
 681         }
 682         request.timing = timing;
 683
 684         switch (ios->signal_voltage) {
 685         case MMC_SIGNAL_VOLTAGE_330:
 686                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_330;
 687                 break;
 688         case MMC_SIGNAL_VOLTAGE_180:
 689         default:
 690                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_180;
 691                 break;
 692         case MMC_SIGNAL_VOLTAGE_120:
 693                 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_120;
 694                 break;
 695         }
 696         request.signal_voltage = signal_voltage;
 697
 698         switch (ios->drv_type) {
 699         case MMC_SET_DRIVER_TYPE_A:
 700                 drv_type = GB_SDIO_SET_DRIVER_TYPE_A;
 701                 break;
 702         case MMC_SET_DRIVER_TYPE_C:
 703                 drv_type = GB_SDIO_SET_DRIVER_TYPE_C;
 704                 break;
 705         case MMC_SET_DRIVER_TYPE_D:
 706                 drv_type = GB_SDIO_SET_DRIVER_TYPE_D;
 707                 break;
 708         case MMC_SET_DRIVER_TYPE_B:
 709         default:
 710                 drv_type = GB_SDIO_SET_DRIVER_TYPE_B;
 711                 break;
 712         }
 713         request.drv_type = drv_type;
 714
 715         ret = gb_sdio_set_ios(host, &request);
 716         if (ret < 0)
 717                 goto out;
 718
 719         memcpy(&mmc->ios, ios, sizeof(mmc->ios));
 720
 721 out:
 722         mutex_unlock(&host->lock);
 723 }
 724
 725 static int gb_mmc_get_ro(struct mmc_host *mmc)
 726 {
 727         struct gb_sdio_host *host = mmc_priv(mmc);
 728
 729         mutex_lock(&host->lock);
 730         if (host->removed) {
 731                 mutex_unlock(&host->lock);
 732                 return -ESHUTDOWN;
 733         }
 734         mutex_unlock(&host->lock);
 735
 736         return host->read_only;
 737 }
 738
 739 static int gb_mmc_get_cd(struct mmc_host *mmc)
 740 {
 741         struct gb_sdio_host *host = mmc_priv(mmc);
 742
 743         mutex_lock(&host->lock);
 744         if (host->removed) {
 745                 mutex_unlock(&host->lock);
 746                 return -ESHUTDOWN;
 747         }
 748         mutex_unlock(&host->lock);
 749
 750         return host->card_present;
 751 }
 752
 753 static int gb_mmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
 754 {
 755         return 0;
 756 }
 757
 758 static const struct mmc_host_ops gb_sdio_ops = {
 759         .request        = gb_mmc_request,
 760         .set_ios        = gb_mmc_set_ios,
 761         .get_ro         = gb_mmc_get_ro,
 762         .get_cd         = gb_mmc_get_cd,
 763         .start_signal_voltage_switch    = gb_mmc_switch_voltage,
 764 };
 765
 766 static int gb_sdio_probe(struct gbphy_device *gbphy_dev,
 767                          const struct gbphy_device_id *id)
 768 {
 769         struct gb_connection *connection;
 770         struct mmc_host *mmc;
 771         struct gb_sdio_host *host;
 772         int ret = 0;
 773
 774         mmc = mmc_alloc_host(sizeof(*host), &gbphy_dev->dev);
 775         if (!mmc)
 776                 return -ENOMEM;
 777
 778         connection = gb_connection_create(gbphy_dev->bundle,
 779                                           le16_to_cpu(gbphy_dev->cport_desc->id),
 780                                           gb_sdio_request_handler);
 781         if (IS_ERR(connection)) {
 782                 ret = PTR_ERR(connection);
 783                 goto exit_mmc_free;
 784         }
 785
 786         host = mmc_priv(mmc);
 787         host->mmc = mmc;
 788         host->removed = true;
 789
 790         host->connection = connection;
 791         gb_connection_set_data(connection, host);
 792         host->gbphy_dev = gbphy_dev;
 793         gb_gbphy_set_data(gbphy_dev, host);
 794
 795         ret = gb_connection_enable_tx(connection);
 796         if (ret)
 797                 goto exit_connection_destroy;
 798
 799         ret = gb_sdio_get_caps(host);
 800         if (ret < 0)
 801                 goto exit_connection_disable;
 802
 803         mmc->ops = &gb_sdio_ops;
 804
 805         mmc->max_segs = host->mmc->max_blk_count;
 806
 807         /* for now we make a map 1:1 between max request and segment size */
 808         mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
 809         mmc->max_seg_size = mmc->max_req_size;
 810
 811         mutex_init(&host->lock);
 812         spin_lock_init(&host->xfer);
 813         host->mrq_workqueue = alloc_workqueue("mmc-%s", 0, 1,
 814                                               dev_name(&gbphy_dev->dev));
 815         if (!host->mrq_workqueue) {
 816                 ret = -ENOMEM;
 817                 goto exit_connection_disable;
 818         }
 819         INIT_WORK(&host->mrqwork, gb_sdio_mrq_work);
 820
 821         ret = gb_connection_enable(connection);
 822         if (ret)
 823                 goto exit_wq_destroy;
 824
 825         ret = mmc_add_host(mmc);
 826         if (ret < 0)
 827                 goto exit_wq_destroy;
 828         host->removed = false;
 829         ret = _gb_sdio_process_events(host, host->queued_events);
 830         host->queued_events = 0;
 831
 832         gbphy_runtime_put_autosuspend(gbphy_dev);
 833
 834         return ret;
 835
 836 exit_wq_destroy:
 837         destroy_workqueue(host->mrq_workqueue);
 838 exit_connection_disable:
 839         gb_connection_disable(connection);
 840 exit_connection_destroy:
 841         gb_connection_destroy(connection);
 842 exit_mmc_free:
 843         mmc_free_host(mmc);
 844
 845         return ret;
 846 }
 847
 848 static void gb_sdio_remove(struct gbphy_device *gbphy_dev)
 849 {
 850         struct gb_sdio_host *host = gb_gbphy_get_data(gbphy_dev);
 851         struct gb_connection *connection = host->connection;
 852         struct mmc_host *mmc;
 853         int ret;
 854
 855         ret = gbphy_runtime_get_sync(gbphy_dev);
 856         if (ret)
 857                 gbphy_runtime_get_noresume(gbphy_dev);
 858
 859         mutex_lock(&host->lock);
 860         host->removed = true;
 861         mmc = host->mmc;
 862         gb_connection_set_data(connection, NULL);
 863         mutex_unlock(&host->lock);
 864
 865         flush_workqueue(host->mrq_workqueue);
 866         destroy_workqueue(host->mrq_workqueue);
 867         gb_connection_disable_rx(connection);
 868         mmc_remove_host(mmc);
 869         gb_connection_disable(connection);
 870         gb_connection_destroy(connection);
 871         mmc_free_host(mmc);
 872 }
 873
 874 static const struct gbphy_device_id gb_sdio_id_table[] = {
 875         { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SDIO) },
 876         { },
 877 };
 878 MODULE_DEVICE_TABLE(gbphy, gb_sdio_id_table);
 879
 880 static struct gbphy_driver sdio_driver = {
 881         .name           = "sdio",
 882         .probe          = gb_sdio_probe,
 883         .remove         = gb_sdio_remove,
 884         .id_table       = gb_sdio_id_table,
 885 };
 886
 887 module_gbphy_driver(sdio_driver);
 888 MODULE_LICENSE("GPL v2");