drivers/mmc/host/tmio_mmc

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This source file includes following definitions.
tmio_mmc_start_dma
tmio_mmc_enable_dma
tmio_mmc_request_dma
tmio_mmc_release_dma
tmio_mmc_abort_dma
tmio_mmc_dataend_dma
tmio_mmc_enable_mmc_irqs
tmio_mmc_disable_mmc_irqs
tmio_mmc_ack_mmc_irqs
tmio_mmc_init_sg
tmio_mmc_next_sg
tmio_mmc_enable_sdio_irq
tmio_mmc_reset
tmio_mmc_hw_reset
tmio_mmc_reset_work
tmio_mmc_start_command
tmio_mmc_transfer_data
tmio_mmc_pio_irq
tmio_mmc_check_bounce_buffer
tmio_mmc_do_data_irq
tmio_mmc_data_irq
tmio_mmc_cmd_irq
__tmio_mmc_card_detect_irq
__tmio_mmc_sdcard_irq
__tmio_mmc_sdio_irq
tmio_mmc_irq
tmio_mmc_start_data
tmio_mmc_execute_tuning
tmio_process_mrq
tmio_mmc_request
tmio_mmc_finish_request
tmio_mmc_done_work
tmio_mmc_power_on
tmio_mmc_power_off
tmio_mmc_set_bus_width
tmio_mmc_set_ios
tmio_mmc_get_ro
tmio_mmc_get_cd
tmio_multi_io_quirk
tmio_mmc_prepare_hs400_tuning
tmio_mmc_hs400_downgrade
tmio_mmc_hs400_complete
tmio_mmc_init_ocr
tmio_mmc_of_parse
tmio_mmc_host_alloc
tmio_mmc_host_free
tmio_mmc_host_probe
tmio_mmc_host_remove
tmio_mmc_clk_enable
tmio_mmc_clk_disable
tmio_mmc_host_runtime_suspend
tmio_mmc_can_retune
tmio_mmc_host_runtime_resume
   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the MMC / SD / SDIO IP found in:
   4  *
   5  * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs
   6  *
   7  * Copyright (C) 2015-19 Renesas Electronics Corporation
   8  * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
   9  * Copyright (C) 2017 Horms Solutions, Simon Horman
  10  * Copyright (C) 2011 Guennadi Liakhovetski
  11  * Copyright (C) 2007 Ian Molton
  12  * Copyright (C) 2004 Ian Molton
  13  *
  14  * This driver draws mainly on scattered spec sheets, Reverse engineering
  15  * of the toshiba e800  SD driver and some parts of the 2.4 ASIC3 driver (4 bit
  16  * support). (Further 4 bit support from a later datasheet).
  17  *
  18  * TODO:
  19  *   Investigate using a workqueue for PIO transfers
  20  *   Eliminate FIXMEs
  21  *   Better Power management
  22  *   Handle MMC errors better
  23  *   double buffer support
  24  *
  25  */
  26 
  27 #include <linux/delay.h>
  28 #include <linux/device.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/highmem.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/io.h>
  33 #include <linux/irq.h>
  34 #include <linux/mfd/tmio.h>
  35 #include <linux/mmc/card.h>
  36 #include <linux/mmc/host.h>
  37 #include <linux/mmc/mmc.h>
  38 #include <linux/mmc/slot-gpio.h>
  39 #include <linux/module.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/platform_device.h>
  42 #include <linux/pm_qos.h>
  43 #include <linux/pm_runtime.h>
  44 #include <linux/regulator/consumer.h>
  45 #include <linux/mmc/sdio.h>
  46 #include <linux/scatterlist.h>
  47 #include <linux/sizes.h>
  48 #include <linux/spinlock.h>
  49 #include <linux/workqueue.h>
  50 
  51 #include "tmio_mmc.h"
  52 
  53 static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
  54                                       struct mmc_data *data)
  55 {
  56         if (host->dma_ops)
  57                 host->dma_ops->start(host, data);
  58 }
  59 
  60 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
  61 {
  62         if (host->dma_ops)
  63                 host->dma_ops->enable(host, enable);
  64 }
  65 
  66 static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
  67                                         struct tmio_mmc_data *pdata)
  68 {
  69         if (host->dma_ops) {
  70                 host->dma_ops->request(host, pdata);
  71         } else {
  72                 host->chan_tx = NULL;
  73                 host->chan_rx = NULL;
  74         }
  75 }
  76 
  77 static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
  78 {
  79         if (host->dma_ops)
  80                 host->dma_ops->release(host);
  81 }
  82 
  83 static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
  84 {
  85         if (host->dma_ops)
  86                 host->dma_ops->abort(host);
  87 }
  88 
  89 static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host)
  90 {
  91         if (host->dma_ops)
  92                 host->dma_ops->dataend(host);
  93 }
  94 
  95 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
  96 {
  97         host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ);
  98         sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
  99 }
 100 EXPORT_SYMBOL_GPL(tmio_mmc_enable_mmc_irqs);
 101 
 102 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i)
 103 {
 104         host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ);
 105         sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask);
 106 }
 107 EXPORT_SYMBOL_GPL(tmio_mmc_disable_mmc_irqs);
 108 
 109 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i)
 110 {
 111         sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i);
 112 }
 113 
 114 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data)
 115 {
 116         host->sg_len = data->sg_len;
 117         host->sg_ptr = data->sg;
 118         host->sg_orig = data->sg;
 119         host->sg_off = 0;
 120 }
 121 
 122 static int tmio_mmc_next_sg(struct tmio_mmc_host *host)
 123 {
 124         host->sg_ptr = sg_next(host->sg_ptr);
 125         host->sg_off = 0;
 126         return --host->sg_len;
 127 }
 128 
 129 #define CMDREQ_TIMEOUT  5000
 130 
 131 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 132 {
 133         struct tmio_mmc_host *host = mmc_priv(mmc);
 134 
 135         if (enable && !host->sdio_irq_enabled) {
 136                 u16 sdio_status;
 137 
 138                 /* Keep device active while SDIO irq is enabled */
 139                 pm_runtime_get_sync(mmc_dev(mmc));
 140 
 141                 host->sdio_irq_enabled = true;
 142                 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ;
 143 
 144                 /* Clear obsolete interrupts before enabling */
 145                 sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS) & ~TMIO_SDIO_MASK_ALL;
 146                 if (host->pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
 147                         sdio_status |= TMIO_SDIO_SETBITS_MASK;
 148                 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
 149 
 150                 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 151         } else if (!enable && host->sdio_irq_enabled) {
 152                 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
 153                 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 154 
 155                 host->sdio_irq_enabled = false;
 156                 pm_runtime_mark_last_busy(mmc_dev(mmc));
 157                 pm_runtime_put_autosuspend(mmc_dev(mmc));
 158         }
 159 }
 160 
 161 static void tmio_mmc_reset(struct tmio_mmc_host *host)
 162 {
 163         /* FIXME - should we set stop clock reg here */
 164         sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
 165         usleep_range(10000, 11000);
 166         sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
 167         usleep_range(10000, 11000);
 168 
 169         if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
 170                 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 171                 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
 172         }
 173 }
 174 
 175 static void tmio_mmc_hw_reset(struct mmc_host *mmc)
 176 {
 177         struct tmio_mmc_host *host = mmc_priv(mmc);
 178 
 179         host->reset(host);
 180 
 181         tmio_mmc_abort_dma(host);
 182 
 183         if (host->hw_reset)
 184                 host->hw_reset(host);
 185 }
 186 
 187 static void tmio_mmc_reset_work(struct work_struct *work)
 188 {
 189         struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
 190                                                   delayed_reset_work.work);
 191         struct mmc_request *mrq;
 192         unsigned long flags;
 193 
 194         spin_lock_irqsave(&host->lock, flags);
 195         mrq = host->mrq;
 196 
 197         /*
 198          * is request already finished? Since we use a non-blocking
 199          * cancel_delayed_work(), it can happen, that a .set_ios() call preempts
 200          * us, so, have to check for IS_ERR(host->mrq)
 201          */
 202         if (IS_ERR_OR_NULL(mrq) ||
 203             time_is_after_jiffies(host->last_req_ts +
 204                                   msecs_to_jiffies(CMDREQ_TIMEOUT))) {
 205                 spin_unlock_irqrestore(&host->lock, flags);
 206                 return;
 207         }
 208 
 209         dev_warn(&host->pdev->dev,
 210                  "timeout waiting for hardware interrupt (CMD%u)\n",
 211                  mrq->cmd->opcode);
 212 
 213         if (host->data)
 214                 host->data->error = -ETIMEDOUT;
 215         else if (host->cmd)
 216                 host->cmd->error = -ETIMEDOUT;
 217         else
 218                 mrq->cmd->error = -ETIMEDOUT;
 219 
 220         host->cmd = NULL;
 221         host->data = NULL;
 222 
 223         spin_unlock_irqrestore(&host->lock, flags);
 224 
 225         tmio_mmc_hw_reset(host->mmc);
 226 
 227         /* Ready for new calls */
 228         host->mrq = NULL;
 229 
 230         mmc_request_done(host->mmc, mrq);
 231 }
 232 
 233 /* These are the bitmasks the tmio chip requires to implement the MMC response
 234  * types. Note that R1 and R6 are the same in this scheme. */
 235 #define APP_CMD        0x0040
 236 #define RESP_NONE      0x0300
 237 #define RESP_R1        0x0400
 238 #define RESP_R1B       0x0500
 239 #define RESP_R2        0x0600
 240 #define RESP_R3        0x0700
 241 #define DATA_PRESENT   0x0800
 242 #define TRANSFER_READ  0x1000
 243 #define TRANSFER_MULTI 0x2000
 244 #define SECURITY_CMD   0x4000
 245 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */
 246 
 247 static int tmio_mmc_start_command(struct tmio_mmc_host *host,
 248                                   struct mmc_command *cmd)
 249 {
 250         struct mmc_data *data = host->data;
 251         int c = cmd->opcode;
 252 
 253         switch (mmc_resp_type(cmd)) {
 254         case MMC_RSP_NONE: c |= RESP_NONE; break;
 255         case MMC_RSP_R1:
 256         case MMC_RSP_R1_NO_CRC:
 257                            c |= RESP_R1;   break;
 258         case MMC_RSP_R1B:  c |= RESP_R1B;  break;
 259         case MMC_RSP_R2:   c |= RESP_R2;   break;
 260         case MMC_RSP_R3:   c |= RESP_R3;   break;
 261         default:
 262                 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd));
 263                 return -EINVAL;
 264         }
 265 
 266         host->cmd = cmd;
 267 
 268 /* FIXME - this seems to be ok commented out but the spec suggest this bit
 269  *         should be set when issuing app commands.
 270  *      if(cmd->flags & MMC_FLAG_ACMD)
 271  *              c |= APP_CMD;
 272  */
 273         if (data) {
 274                 c |= DATA_PRESENT;
 275                 if (data->blocks > 1) {
 276                         sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC);
 277                         c |= TRANSFER_MULTI;
 278 
 279                         /*
 280                          * Disable auto CMD12 at IO_RW_EXTENDED and
 281                          * SET_BLOCK_COUNT when doing multiple block transfer
 282                          */
 283                         if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) &&
 284                             (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc))
 285                                 c |= NO_CMD12_ISSUE;
 286                 }
 287                 if (data->flags & MMC_DATA_READ)
 288                         c |= TRANSFER_READ;
 289         }
 290 
 291         tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD);
 292 
 293         /* Fire off the command */
 294         sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg);
 295         sd_ctrl_write16(host, CTL_SD_CMD, c);
 296 
 297         return 0;
 298 }
 299 
 300 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host,
 301                                    unsigned short *buf,
 302                                    unsigned int count)
 303 {
 304         int is_read = host->data->flags & MMC_DATA_READ;
 305         u8  *buf8;
 306 
 307         /*
 308          * Transfer the data
 309          */
 310         if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) {
 311                 u32 data = 0;
 312                 u32 *buf32 = (u32 *)buf;
 313 
 314                 if (is_read)
 315                         sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32,
 316                                            count >> 2);
 317                 else
 318                         sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32,
 319                                             count >> 2);
 320 
 321                 /* if count was multiple of 4 */
 322                 if (!(count & 0x3))
 323                         return;
 324 
 325                 buf32 += count >> 2;
 326                 count %= 4;
 327 
 328                 if (is_read) {
 329                         sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1);
 330                         memcpy(buf32, &data, count);
 331                 } else {
 332                         memcpy(&data, buf32, count);
 333                         sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1);
 334                 }
 335 
 336                 return;
 337         }
 338 
 339         if (is_read)
 340                 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
 341         else
 342                 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1);
 343 
 344         /* if count was even number */
 345         if (!(count & 0x1))
 346                 return;
 347 
 348         /* if count was odd number */
 349         buf8 = (u8 *)(buf + (count >> 1));
 350 
 351         /*
 352          * FIXME
 353          *
 354          * driver and this function are assuming that
 355          * it is used as little endian
 356          */
 357         if (is_read)
 358                 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff;
 359         else
 360                 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8);
 361 }
 362 
 363 /*
 364  * This chip always returns (at least?) as much data as you ask for.
 365  * I'm unsure what happens if you ask for less than a block. This should be
 366  * looked into to ensure that a funny length read doesn't hose the controller.
 367  */
 368 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host)
 369 {
 370         struct mmc_data *data = host->data;
 371         void *sg_virt;
 372         unsigned short *buf;
 373         unsigned int count;
 374         unsigned long flags;
 375 
 376         if (host->dma_on) {
 377                 pr_err("PIO IRQ in DMA mode!\n");
 378                 return;
 379         } else if (!data) {
 380                 pr_debug("Spurious PIO IRQ\n");
 381                 return;
 382         }
 383 
 384         sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags);
 385         buf = (unsigned short *)(sg_virt + host->sg_off);
 386 
 387         count = host->sg_ptr->length - host->sg_off;
 388         if (count > data->blksz)
 389                 count = data->blksz;
 390 
 391         pr_debug("count: %08x offset: %08x flags %08x\n",
 392                  count, host->sg_off, data->flags);
 393 
 394         /* Transfer the data */
 395         tmio_mmc_transfer_data(host, buf, count);
 396 
 397         host->sg_off += count;
 398 
 399         tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt);
 400 
 401         if (host->sg_off == host->sg_ptr->length)
 402                 tmio_mmc_next_sg(host);
 403 }
 404 
 405 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host)
 406 {
 407         if (host->sg_ptr == &host->bounce_sg) {
 408                 unsigned long flags;
 409                 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags);
 410 
 411                 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length);
 412                 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr);
 413         }
 414 }
 415 
 416 /* needs to be called with host->lock held */
 417 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host)
 418 {
 419         struct mmc_data *data = host->data;
 420         struct mmc_command *stop;
 421 
 422         host->data = NULL;
 423 
 424         if (!data) {
 425                 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n");
 426                 return;
 427         }
 428         stop = data->stop;
 429 
 430         /* FIXME - return correct transfer count on errors */
 431         if (!data->error)
 432                 data->bytes_xfered = data->blocks * data->blksz;
 433         else
 434                 data->bytes_xfered = 0;
 435 
 436         pr_debug("Completed data request\n");
 437 
 438         /*
 439          * FIXME: other drivers allow an optional stop command of any given type
 440          *        which we dont do, as the chip can auto generate them.
 441          *        Perhaps we can be smarter about when to use auto CMD12 and
 442          *        only issue the auto request when we know this is the desired
 443          *        stop command, allowing fallback to the stop command the
 444          *        upper layers expect. For now, we do what works.
 445          */
 446 
 447         if (data->flags & MMC_DATA_READ) {
 448                 if (host->dma_on)
 449                         tmio_mmc_check_bounce_buffer(host);
 450                 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n",
 451                         host->mrq);
 452         } else {
 453                 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n",
 454                         host->mrq);
 455         }
 456 
 457         if (stop && !host->mrq->sbc) {
 458                 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg)
 459                         dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n",
 460                                 stop->opcode, stop->arg);
 461 
 462                 /* fill in response from auto CMD12 */
 463                 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE);
 464 
 465                 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0);
 466         }
 467 
 468         schedule_work(&host->done);
 469 }
 470 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq);
 471 
 472 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat)
 473 {
 474         struct mmc_data *data;
 475 
 476         spin_lock(&host->lock);
 477         data = host->data;
 478 
 479         if (!data)
 480                 goto out;
 481 
 482         if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR ||
 483             stat & TMIO_STAT_TXUNDERRUN)
 484                 data->error = -EILSEQ;
 485         if (host->dma_on && (data->flags & MMC_DATA_WRITE)) {
 486                 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
 487                 bool done = false;
 488 
 489                 /*
 490                  * Has all data been written out yet? Testing on SuperH showed,
 491                  * that in most cases the first interrupt comes already with the
 492                  * BUSY status bit clear, but on some operations, like mount or
 493                  * in the beginning of a write / sync / umount, there is one
 494                  * DATAEND interrupt with the BUSY bit set, in this cases
 495                  * waiting for one more interrupt fixes the problem.
 496                  */
 497                 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) {
 498                         if (status & TMIO_STAT_SCLKDIVEN)
 499                                 done = true;
 500                 } else {
 501                         if (!(status & TMIO_STAT_CMD_BUSY))
 502                                 done = true;
 503                 }
 504 
 505                 if (done) {
 506                         tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
 507                         tmio_mmc_dataend_dma(host);
 508                 }
 509         } else if (host->dma_on && (data->flags & MMC_DATA_READ)) {
 510                 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND);
 511                 tmio_mmc_dataend_dma(host);
 512         } else {
 513                 tmio_mmc_do_data_irq(host);
 514                 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP);
 515         }
 516 out:
 517         spin_unlock(&host->lock);
 518 }
 519 
 520 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
 521 {
 522         struct mmc_command *cmd = host->cmd;
 523         int i, addr;
 524 
 525         spin_lock(&host->lock);
 526 
 527         if (!host->cmd) {
 528                 pr_debug("Spurious CMD irq\n");
 529                 goto out;
 530         }
 531 
 532         /* This controller is sicker than the PXA one. Not only do we need to
 533          * drop the top 8 bits of the first response word, we also need to
 534          * modify the order of the response for short response command types.
 535          */
 536 
 537         for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4)
 538                 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr);
 539 
 540         if (cmd->flags &  MMC_RSP_136) {
 541                 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24);
 542                 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24);
 543                 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24);
 544                 cmd->resp[3] <<= 8;
 545         } else if (cmd->flags & MMC_RSP_R3) {
 546                 cmd->resp[0] = cmd->resp[3];
 547         }
 548 
 549         if (stat & TMIO_STAT_CMDTIMEOUT)
 550                 cmd->error = -ETIMEDOUT;
 551         else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) ||
 552                  stat & TMIO_STAT_STOPBIT_ERR ||
 553                  stat & TMIO_STAT_CMD_IDX_ERR)
 554                 cmd->error = -EILSEQ;
 555 
 556         /* If there is data to handle we enable data IRQs here, and
 557          * we will ultimatley finish the request in the data_end handler.
 558          * If theres no data or we encountered an error, finish now.
 559          */
 560         if (host->data && (!cmd->error || cmd->error == -EILSEQ)) {
 561                 if (host->data->flags & MMC_DATA_READ) {
 562                         if (!host->dma_on) {
 563                                 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP);
 564                         } else {
 565                                 tmio_mmc_disable_mmc_irqs(host,
 566                                                           TMIO_MASK_READOP);
 567                                 tasklet_schedule(&host->dma_issue);
 568                         }
 569                 } else {
 570                         if (!host->dma_on) {
 571                                 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP);
 572                         } else {
 573                                 tmio_mmc_disable_mmc_irqs(host,
 574                                                           TMIO_MASK_WRITEOP);
 575                                 tasklet_schedule(&host->dma_issue);
 576                         }
 577                 }
 578         } else {
 579                 schedule_work(&host->done);
 580         }
 581 
 582 out:
 583         spin_unlock(&host->lock);
 584 }
 585 
 586 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host,
 587                                        int ireg, int status)
 588 {
 589         struct mmc_host *mmc = host->mmc;
 590 
 591         /* Card insert / remove attempts */
 592         if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) {
 593                 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT |
 594                         TMIO_STAT_CARD_REMOVE);
 595                 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) ||
 596                      ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) &&
 597                     !work_pending(&mmc->detect.work))
 598                         mmc_detect_change(host->mmc, msecs_to_jiffies(100));
 599                 return true;
 600         }
 601 
 602         return false;
 603 }
 604 
 605 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg,
 606                                   int status)
 607 {
 608         /* Command completion */
 609         if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) {
 610                 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND |
 611                                       TMIO_STAT_CMDTIMEOUT);
 612                 tmio_mmc_cmd_irq(host, status);
 613                 return true;
 614         }
 615 
 616         /* Data transfer */
 617         if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) {
 618                 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ);
 619                 tmio_mmc_pio_irq(host);
 620                 return true;
 621         }
 622 
 623         /* Data transfer completion */
 624         if (ireg & TMIO_STAT_DATAEND) {
 625                 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND);
 626                 tmio_mmc_data_irq(host, status);
 627                 return true;
 628         }
 629 
 630         return false;
 631 }
 632 
 633 static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host)
 634 {
 635         struct mmc_host *mmc = host->mmc;
 636         struct tmio_mmc_data *pdata = host->pdata;
 637         unsigned int ireg, status;
 638         unsigned int sdio_status;
 639 
 640         if (!(pdata->flags & TMIO_MMC_SDIO_IRQ))
 641                 return false;
 642 
 643         status = sd_ctrl_read16(host, CTL_SDIO_STATUS);
 644         ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask;
 645 
 646         sdio_status = status & ~TMIO_SDIO_MASK_ALL;
 647         if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS)
 648                 sdio_status |= TMIO_SDIO_SETBITS_MASK;
 649 
 650         sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status);
 651 
 652         if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ)
 653                 mmc_signal_sdio_irq(mmc);
 654 
 655         return ireg;
 656 }
 657 
 658 irqreturn_t tmio_mmc_irq(int irq, void *devid)
 659 {
 660         struct tmio_mmc_host *host = devid;
 661         unsigned int ireg, status;
 662 
 663         status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS);
 664         ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask;
 665 
 666         /* Clear the status except the interrupt status */
 667         sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ);
 668 
 669         if (__tmio_mmc_card_detect_irq(host, ireg, status))
 670                 return IRQ_HANDLED;
 671         if (__tmio_mmc_sdcard_irq(host, ireg, status))
 672                 return IRQ_HANDLED;
 673 
 674         if (__tmio_mmc_sdio_irq(host))
 675                 return IRQ_HANDLED;
 676 
 677         return IRQ_NONE;
 678 }
 679 EXPORT_SYMBOL_GPL(tmio_mmc_irq);
 680 
 681 static int tmio_mmc_start_data(struct tmio_mmc_host *host,
 682                                struct mmc_data *data)
 683 {
 684         struct tmio_mmc_data *pdata = host->pdata;
 685 
 686         pr_debug("setup data transfer: blocksize %08x  nr_blocks %d\n",
 687                  data->blksz, data->blocks);
 688 
 689         /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */
 690         if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 ||
 691             host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
 692                 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES;
 693 
 694                 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) {
 695                         pr_err("%s: %d byte block unsupported in 4/8 bit mode\n",
 696                                mmc_hostname(host->mmc), data->blksz);
 697                         return -EINVAL;
 698                 }
 699         }
 700 
 701         tmio_mmc_init_sg(host, data);
 702         host->data = data;
 703         host->dma_on = false;
 704 
 705         /* Set transfer length / blocksize */
 706         sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz);
 707         if (host->mmc->max_blk_count >= SZ_64K)
 708                 sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks);
 709         else
 710                 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks);
 711 
 712         tmio_mmc_start_dma(host, data);
 713 
 714         return 0;
 715 }
 716 
 717 static int tmio_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 718 {
 719         struct tmio_mmc_host *host = mmc_priv(mmc);
 720         int i, ret = 0;
 721 
 722         if (!host->init_tuning || !host->select_tuning)
 723                 /* Tuning is not supported */
 724                 goto out;
 725 
 726         host->tap_num = host->init_tuning(host);
 727         if (!host->tap_num)
 728                 /* Tuning is not supported */
 729                 goto out;
 730 
 731         if (host->tap_num * 2 >= sizeof(host->taps) * BITS_PER_BYTE) {
 732                 dev_warn_once(&host->pdev->dev,
 733                         "Too many taps, skipping tuning. Please consider updating size of taps field of tmio_mmc_host\n");
 734                 goto out;
 735         }
 736 
 737         bitmap_zero(host->taps, host->tap_num * 2);
 738 
 739         /* Issue CMD19 twice for each tap */
 740         for (i = 0; i < 2 * host->tap_num; i++) {
 741                 if (host->prepare_tuning)
 742                         host->prepare_tuning(host, i % host->tap_num);
 743 
 744                 ret = mmc_send_tuning(mmc, opcode, NULL);
 745                 if (ret == 0)
 746                         set_bit(i, host->taps);
 747         }
 748 
 749         ret = host->select_tuning(host);
 750 
 751 out:
 752         if (ret < 0) {
 753                 dev_warn(&host->pdev->dev, "Tuning procedure failed\n");
 754                 tmio_mmc_hw_reset(mmc);
 755         }
 756 
 757         return ret;
 758 }
 759 
 760 static void tmio_process_mrq(struct tmio_mmc_host *host,
 761                              struct mmc_request *mrq)
 762 {
 763         struct mmc_command *cmd;
 764         int ret;
 765 
 766         if (mrq->sbc && host->cmd != mrq->sbc) {
 767                 cmd = mrq->sbc;
 768         } else {
 769                 cmd = mrq->cmd;
 770                 if (mrq->data) {
 771                         ret = tmio_mmc_start_data(host, mrq->data);
 772                         if (ret)
 773                                 goto fail;
 774                 }
 775         }
 776 
 777         ret = tmio_mmc_start_command(host, cmd);
 778         if (ret)
 779                 goto fail;
 780 
 781         schedule_delayed_work(&host->delayed_reset_work,
 782                               msecs_to_jiffies(CMDREQ_TIMEOUT));
 783         return;
 784 
 785 fail:
 786         host->mrq = NULL;
 787         mrq->cmd->error = ret;
 788         mmc_request_done(host->mmc, mrq);
 789 }
 790 
 791 /* Process requests from the MMC layer */
 792 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 793 {
 794         struct tmio_mmc_host *host = mmc_priv(mmc);
 795         unsigned long flags;
 796 
 797         spin_lock_irqsave(&host->lock, flags);
 798 
 799         if (host->mrq) {
 800                 pr_debug("request not null\n");
 801                 if (IS_ERR(host->mrq)) {
 802                         spin_unlock_irqrestore(&host->lock, flags);
 803                         mrq->cmd->error = -EAGAIN;
 804                         mmc_request_done(mmc, mrq);
 805                         return;
 806                 }
 807         }
 808 
 809         host->last_req_ts = jiffies;
 810         wmb();
 811         host->mrq = mrq;
 812 
 813         spin_unlock_irqrestore(&host->lock, flags);
 814 
 815         tmio_process_mrq(host, mrq);
 816 }
 817 
 818 static void tmio_mmc_finish_request(struct tmio_mmc_host *host)
 819 {
 820         struct mmc_request *mrq;
 821         unsigned long flags;
 822 
 823         spin_lock_irqsave(&host->lock, flags);
 824 
 825         mrq = host->mrq;
 826         if (IS_ERR_OR_NULL(mrq)) {
 827                 spin_unlock_irqrestore(&host->lock, flags);
 828                 return;
 829         }
 830 
 831         /* If not SET_BLOCK_COUNT, clear old data */
 832         if (host->cmd != mrq->sbc) {
 833                 host->cmd = NULL;
 834                 host->data = NULL;
 835                 host->mrq = NULL;
 836         }
 837 
 838         cancel_delayed_work(&host->delayed_reset_work);
 839 
 840         spin_unlock_irqrestore(&host->lock, flags);
 841 
 842         if (mrq->cmd->error || (mrq->data && mrq->data->error))
 843                 tmio_mmc_abort_dma(host);
 844 
 845         /* SCC error means retune, but executed command was still successful */
 846         if (host->check_scc_error && host->check_scc_error(host))
 847                 mmc_retune_needed(host->mmc);
 848 
 849         /* If SET_BLOCK_COUNT, continue with main command */
 850         if (host->mrq && !mrq->cmd->error) {
 851                 tmio_process_mrq(host, mrq);
 852                 return;
 853         }
 854 
 855         mmc_request_done(host->mmc, mrq);
 856 }
 857 
 858 static void tmio_mmc_done_work(struct work_struct *work)
 859 {
 860         struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host,
 861                                                   done);
 862         tmio_mmc_finish_request(host);
 863 }
 864 
 865 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd)
 866 {
 867         struct mmc_host *mmc = host->mmc;
 868         int ret = 0;
 869 
 870         /* .set_ios() is returning void, so, no chance to report an error */
 871 
 872         if (host->set_pwr)
 873                 host->set_pwr(host->pdev, 1);
 874 
 875         if (!IS_ERR(mmc->supply.vmmc)) {
 876                 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
 877                 /*
 878                  * Attention: empiric value. With a b43 WiFi SDIO card this
 879                  * delay proved necessary for reliable card-insertion probing.
 880                  * 100us were not enough. Is this the same 140us delay, as in
 881                  * tmio_mmc_set_ios()?
 882                  */
 883                 usleep_range(200, 300);
 884         }
 885         /*
 886          * It seems, VccQ should be switched on after Vcc, this is also what the
 887          * omap_hsmmc.c driver does.
 888          */
 889         if (!IS_ERR(mmc->supply.vqmmc) && !ret) {
 890                 ret = regulator_enable(mmc->supply.vqmmc);
 891                 usleep_range(200, 300);
 892         }
 893 
 894         if (ret < 0)
 895                 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n",
 896                         ret);
 897 }
 898 
 899 static void tmio_mmc_power_off(struct tmio_mmc_host *host)
 900 {
 901         struct mmc_host *mmc = host->mmc;
 902 
 903         if (!IS_ERR(mmc->supply.vqmmc))
 904                 regulator_disable(mmc->supply.vqmmc);
 905 
 906         if (!IS_ERR(mmc->supply.vmmc))
 907                 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
 908 
 909         if (host->set_pwr)
 910                 host->set_pwr(host->pdev, 0);
 911 }
 912 
 913 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
 914                                    unsigned char bus_width)
 915 {
 916         u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
 917                                 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
 918 
 919         /* reg now applies to MMC_BUS_WIDTH_4 */
 920         if (bus_width == MMC_BUS_WIDTH_1)
 921                 reg |= CARD_OPT_WIDTH;
 922         else if (bus_width == MMC_BUS_WIDTH_8)
 923                 reg |= CARD_OPT_WIDTH8;
 924 
 925         sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
 926 }
 927 
 928 /* Set MMC clock / power.
 929  * Note: This controller uses a simple divider scheme therefore it cannot
 930  * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
 931  * MMC wont run that fast, it has to be clocked at 12MHz which is the next
 932  * slowest setting.
 933  */
 934 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 935 {
 936         struct tmio_mmc_host *host = mmc_priv(mmc);
 937         struct device *dev = &host->pdev->dev;
 938         unsigned long flags;
 939 
 940         mutex_lock(&host->ios_lock);
 941 
 942         spin_lock_irqsave(&host->lock, flags);
 943         if (host->mrq) {
 944                 if (IS_ERR(host->mrq)) {
 945                         dev_dbg(dev,
 946                                 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n",
 947                                 current->comm, task_pid_nr(current),
 948                                 ios->clock, ios->power_mode);
 949                         host->mrq = ERR_PTR(-EINTR);
 950                 } else {
 951                         dev_dbg(dev,
 952                                 "%s.%d: CMD%u active since %lu, now %lu!\n",
 953                                 current->comm, task_pid_nr(current),
 954                                 host->mrq->cmd->opcode, host->last_req_ts,
 955                                 jiffies);
 956                 }
 957                 spin_unlock_irqrestore(&host->lock, flags);
 958 
 959                 mutex_unlock(&host->ios_lock);
 960                 return;
 961         }
 962 
 963         host->mrq = ERR_PTR(-EBUSY);
 964 
 965         spin_unlock_irqrestore(&host->lock, flags);
 966 
 967         switch (ios->power_mode) {
 968         case MMC_POWER_OFF:
 969                 tmio_mmc_power_off(host);
 970                 host->set_clock(host, 0);
 971                 break;
 972         case MMC_POWER_UP:
 973                 tmio_mmc_power_on(host, ios->vdd);
 974                 host->set_clock(host, ios->clock);
 975                 tmio_mmc_set_bus_width(host, ios->bus_width);
 976                 break;
 977         case MMC_POWER_ON:
 978                 host->set_clock(host, ios->clock);
 979                 tmio_mmc_set_bus_width(host, ios->bus_width);
 980                 break;
 981         }
 982 
 983         /* Let things settle. delay taken from winCE driver */
 984         usleep_range(140, 200);
 985         if (PTR_ERR(host->mrq) == -EINTR)
 986                 dev_dbg(&host->pdev->dev,
 987                         "%s.%d: IOS interrupted: clk %u, mode %u",
 988                         current->comm, task_pid_nr(current),
 989                         ios->clock, ios->power_mode);
 990         host->mrq = NULL;
 991 
 992         host->clk_cache = ios->clock;
 993 
 994         mutex_unlock(&host->ios_lock);
 995 }
 996 
 997 static int tmio_mmc_get_ro(struct mmc_host *mmc)
 998 {
 999         struct tmio_mmc_host *host = mmc_priv(mmc);
1000 
1001         return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
1002                  TMIO_STAT_WRPROTECT);
1003 }
1004 
1005 static int tmio_mmc_get_cd(struct mmc_host *mmc)
1006 {
1007         struct tmio_mmc_host *host = mmc_priv(mmc);
1008 
1009         return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
1010                   TMIO_STAT_SIGSTATE);
1011 }
1012 
1013 static int tmio_multi_io_quirk(struct mmc_card *card,
1014                                unsigned int direction, int blk_size)
1015 {
1016         struct tmio_mmc_host *host = mmc_priv(card->host);
1017 
1018         if (host->multi_io_quirk)
1019                 return host->multi_io_quirk(card, direction, blk_size);
1020 
1021         return blk_size;
1022 }
1023 
1024 static int tmio_mmc_prepare_hs400_tuning(struct mmc_host *mmc,
1025                                          struct mmc_ios *ios)
1026 {
1027         struct tmio_mmc_host *host = mmc_priv(mmc);
1028 
1029         if (host->prepare_hs400_tuning)
1030                 host->prepare_hs400_tuning(host);
1031 
1032         return 0;
1033 }
1034 
1035 static void tmio_mmc_hs400_downgrade(struct mmc_host *mmc)
1036 {
1037         struct tmio_mmc_host *host = mmc_priv(mmc);
1038 
1039         if (host->hs400_downgrade)
1040                 host->hs400_downgrade(host);
1041 }
1042 
1043 static void tmio_mmc_hs400_complete(struct mmc_host *mmc)
1044 {
1045         struct tmio_mmc_host *host = mmc_priv(mmc);
1046 
1047         if (host->hs400_complete)
1048                 host->hs400_complete(host);
1049 }
1050 
1051 static const struct mmc_host_ops tmio_mmc_ops = {
1052         .request        = tmio_mmc_request,
1053         .set_ios        = tmio_mmc_set_ios,
1054         .get_ro         = tmio_mmc_get_ro,
1055         .get_cd         = tmio_mmc_get_cd,
1056         .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
1057         .multi_io_quirk = tmio_multi_io_quirk,
1058         .hw_reset       = tmio_mmc_hw_reset,
1059         .execute_tuning = tmio_mmc_execute_tuning,
1060         .prepare_hs400_tuning = tmio_mmc_prepare_hs400_tuning,
1061         .hs400_downgrade = tmio_mmc_hs400_downgrade,
1062         .hs400_complete = tmio_mmc_hs400_complete,
1063 };
1064 
1065 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
1066 {
1067         struct tmio_mmc_data *pdata = host->pdata;
1068         struct mmc_host *mmc = host->mmc;
1069         int err;
1070 
1071         err = mmc_regulator_get_supply(mmc);
1072         if (err)
1073                 return err;
1074 
1075         /* use ocr_mask if no regulator */
1076         if (!mmc->ocr_avail)
1077                 mmc->ocr_avail = pdata->ocr_mask;
1078 
1079         /*
1080          * try again.
1081          * There is possibility that regulator has not been probed
1082          */
1083         if (!mmc->ocr_avail)
1084                 return -EPROBE_DEFER;
1085 
1086         return 0;
1087 }
1088 
1089 static void tmio_mmc_of_parse(struct platform_device *pdev,
1090                               struct mmc_host *mmc)
1091 {
1092         const struct device_node *np = pdev->dev.of_node;
1093 
1094         if (!np)
1095                 return;
1096 
1097         /*
1098          * DEPRECATED:
1099          * For new platforms, please use "disable-wp" instead of
1100          * "toshiba,mmc-wrprotect-disable"
1101          */
1102         if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL))
1103                 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
1104 }
1105 
1106 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
1107                                           struct tmio_mmc_data *pdata)
1108 {
1109         struct tmio_mmc_host *host;
1110         struct mmc_host *mmc;
1111         struct resource *res;
1112         void __iomem *ctl;
1113         int ret;
1114 
1115         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1116         ctl = devm_ioremap_resource(&pdev->dev, res);
1117         if (IS_ERR(ctl))
1118                 return ERR_CAST(ctl);
1119 
1120         mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev);
1121         if (!mmc)
1122                 return ERR_PTR(-ENOMEM);
1123 
1124         host = mmc_priv(mmc);
1125         host->ctl = ctl;
1126         host->mmc = mmc;
1127         host->pdev = pdev;
1128         host->pdata = pdata;
1129         host->ops = tmio_mmc_ops;
1130         mmc->ops = &host->ops;
1131 
1132         ret = mmc_of_parse(host->mmc);
1133         if (ret) {
1134                 host = ERR_PTR(ret);
1135                 goto free;
1136         }
1137 
1138         tmio_mmc_of_parse(pdev, mmc);
1139 
1140         platform_set_drvdata(pdev, host);
1141 
1142         return host;
1143 free:
1144         mmc_free_host(mmc);
1145 
1146         return host;
1147 }
1148 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc);
1149 
1150 void tmio_mmc_host_free(struct tmio_mmc_host *host)
1151 {
1152         mmc_free_host(host->mmc);
1153 }
1154 EXPORT_SYMBOL_GPL(tmio_mmc_host_free);
1155 
1156 int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
1157 {
1158         struct platform_device *pdev = _host->pdev;
1159         struct tmio_mmc_data *pdata = _host->pdata;
1160         struct mmc_host *mmc = _host->mmc;
1161         int ret;
1162 
1163         /*
1164          * Check the sanity of mmc->f_min to prevent host->set_clock() from
1165          * looping forever...
1166          */
1167         if (mmc->f_min == 0)
1168                 return -EINVAL;
1169 
1170         if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT))
1171                 _host->write16_hook = NULL;
1172 
1173         _host->set_pwr = pdata->set_pwr;
1174 
1175         ret = tmio_mmc_init_ocr(_host);
1176         if (ret < 0)
1177                 return ret;
1178 
1179         /*
1180          * Look for a card detect GPIO, if it fails with anything
1181          * else than a probe deferral, just live without it.
1182          */
1183         ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
1184         if (ret == -EPROBE_DEFER)
1185                 return ret;
1186 
1187         mmc->caps |= MMC_CAP_ERASE | MMC_CAP_4_BIT_DATA | pdata->capabilities;
1188         mmc->caps2 |= pdata->capabilities2;
1189         mmc->max_segs = pdata->max_segs ? : 32;
1190         mmc->max_blk_size = TMIO_MAX_BLK_SIZE;
1191         mmc->max_blk_count = pdata->max_blk_count ? :
1192                 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs;
1193         mmc->max_req_size = min_t(size_t,
1194                                   mmc->max_blk_size * mmc->max_blk_count,
1195                                   dma_max_mapping_size(&pdev->dev));
1196         mmc->max_seg_size = mmc->max_req_size;
1197 
1198         if (mmc_can_gpio_ro(mmc))
1199                 _host->ops.get_ro = mmc_gpio_get_ro;
1200 
1201         if (mmc_can_gpio_cd(mmc))
1202                 _host->ops.get_cd = mmc_gpio_get_cd;
1203 
1204         _host->native_hotplug = !(mmc_can_gpio_cd(mmc) ||
1205                                   mmc->caps & MMC_CAP_NEEDS_POLL ||
1206                                   !mmc_card_is_removable(mmc));
1207 
1208         if (!_host->reset)
1209                 _host->reset = tmio_mmc_reset;
1210 
1211         /*
1212          * On Gen2+, eMMC with NONREMOVABLE currently fails because native
1213          * hotplug gets disabled. It seems RuntimePM related yet we need further
1214          * research. Since we are planning a PM overhaul anyway, let's enforce
1215          * for now the device being active by enabling native hotplug always.
1216          */
1217         if (pdata->flags & TMIO_MMC_MIN_RCAR2)
1218                 _host->native_hotplug = true;
1219 
1220         /*
1221          * While using internal tmio hardware logic for card detection, we need
1222          * to ensure it stays powered for it to work.
1223          */
1224         if (_host->native_hotplug)
1225                 pm_runtime_get_noresume(&pdev->dev);
1226 
1227         _host->sdio_irq_enabled = false;
1228         if (pdata->flags & TMIO_MMC_SDIO_IRQ)
1229                 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
1230 
1231         _host->set_clock(_host, 0);
1232         tmio_mmc_hw_reset(mmc);
1233 
1234         _host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK);
1235         tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
1236 
1237         if (_host->native_hotplug)
1238                 tmio_mmc_enable_mmc_irqs(_host,
1239                                 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1240 
1241         spin_lock_init(&_host->lock);
1242         mutex_init(&_host->ios_lock);
1243 
1244         /* Init delayed work for request timeouts */
1245         INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work);
1246         INIT_WORK(&_host->done, tmio_mmc_done_work);
1247 
1248         /* See if we also get DMA */
1249         tmio_mmc_request_dma(_host, pdata);
1250 
1251         pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1252         pm_runtime_use_autosuspend(&pdev->dev);
1253         pm_runtime_enable(&pdev->dev);
1254         pm_runtime_get_sync(&pdev->dev);
1255 
1256         ret = mmc_add_host(mmc);
1257         if (ret)
1258                 goto remove_host;
1259 
1260         dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
1261         pm_runtime_put(&pdev->dev);
1262 
1263         return 0;
1264 
1265 remove_host:
1266         pm_runtime_put_noidle(&pdev->dev);
1267         tmio_mmc_host_remove(_host);
1268         return ret;
1269 }
1270 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe);
1271 
1272 void tmio_mmc_host_remove(struct tmio_mmc_host *host)
1273 {
1274         struct platform_device *pdev = host->pdev;
1275         struct mmc_host *mmc = host->mmc;
1276 
1277         pm_runtime_get_sync(&pdev->dev);
1278 
1279         if (host->pdata->flags & TMIO_MMC_SDIO_IRQ)
1280                 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
1281 
1282         dev_pm_qos_hide_latency_limit(&pdev->dev);
1283 
1284         mmc_remove_host(mmc);
1285         cancel_work_sync(&host->done);
1286         cancel_delayed_work_sync(&host->delayed_reset_work);
1287         tmio_mmc_release_dma(host);
1288         tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1289 
1290         if (host->native_hotplug)
1291                 pm_runtime_put_noidle(&pdev->dev);
1292 
1293         pm_runtime_disable(&pdev->dev);
1294         pm_runtime_dont_use_autosuspend(&pdev->dev);
1295         pm_runtime_put_noidle(&pdev->dev);
1296 }
1297 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove);
1298 
1299 #ifdef CONFIG_PM
1300 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host)
1301 {
1302         if (!host->clk_enable)
1303                 return -ENOTSUPP;
1304 
1305         return host->clk_enable(host);
1306 }
1307 
1308 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host)
1309 {
1310         if (host->clk_disable)
1311                 host->clk_disable(host);
1312 }
1313 
1314 int tmio_mmc_host_runtime_suspend(struct device *dev)
1315 {
1316         struct tmio_mmc_host *host = dev_get_drvdata(dev);
1317 
1318         tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL);
1319 
1320         if (host->clk_cache)
1321                 host->set_clock(host, 0);
1322 
1323         tmio_mmc_clk_disable(host);
1324 
1325         return 0;
1326 }
1327 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend);
1328 
1329 static bool tmio_mmc_can_retune(struct tmio_mmc_host *host)
1330 {
1331         return host->tap_num && mmc_can_retune(host->mmc);
1332 }
1333 
1334 int tmio_mmc_host_runtime_resume(struct device *dev)
1335 {
1336         struct tmio_mmc_host *host = dev_get_drvdata(dev);
1337 
1338         if (!host->runtime_synced) {
1339                 host->runtime_synced = true;
1340                 return 0;
1341         }
1342 
1343         tmio_mmc_clk_enable(host);
1344         tmio_mmc_hw_reset(host->mmc);
1345 
1346         if (host->clk_cache)
1347                 host->set_clock(host, host->clk_cache);
1348 
1349         if (host->native_hotplug)
1350                 tmio_mmc_enable_mmc_irqs(host,
1351                                 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);
1352 
1353         tmio_mmc_enable_dma(host, true);
1354 
1355         if (tmio_mmc_can_retune(host) && host->select_tuning(host))
1356                 dev_warn(&host->pdev->dev, "Tuning selection failed\n");
1357 
1358         return 0;
1359 }
1360 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume);
1361 #endif
1362 
1363 MODULE_LICENSE("GPL v2");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mmc/host/tmio_mmc_core.c

DEFINITIONS
