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_end_dma(struct tmio_mmc_host *host) 61 { 62 if (host->dma_ops && host->dma_ops->end) 63 host->dma_ops->end(host); 64 } 65 66 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) 67 { 68 if (host->dma_ops) 69 host->dma_ops->enable(host, enable); 70 } 71 72 static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host, 73 struct tmio_mmc_data *pdata) 74 { 75 if (host->dma_ops) { 76 host->dma_ops->request(host, pdata); 77 } else { 78 host->chan_tx = NULL; 79 host->chan_rx = NULL; 80 } 81 } 82 83 static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host) 84 { 85 if (host->dma_ops) 86 host->dma_ops->release(host); 87 } 88 89 static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host) 90 { 91 if (host->dma_ops) 92 host->dma_ops->abort(host); 93 } 94 95 static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host) 96 { 97 if (host->dma_ops) 98 host->dma_ops->dataend(host); 99 } 100 101 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i) 102 { 103 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ); 104 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask); 105 } 106 EXPORT_SYMBOL_GPL(tmio_mmc_enable_mmc_irqs); 107 108 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i) 109 { 110 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ); 111 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask); 112 } 113 EXPORT_SYMBOL_GPL(tmio_mmc_disable_mmc_irqs); 114 115 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i) 116 { 117 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i); 118 } 119 120 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data) 121 { 122 host->sg_len = data->sg_len; 123 host->sg_ptr = data->sg; 124 host->sg_orig = data->sg; 125 host->sg_off = 0; 126 } 127 128 static int tmio_mmc_next_sg(struct tmio_mmc_host *host) 129 { 130 host->sg_ptr = sg_next(host->sg_ptr); 131 host->sg_off = 0; 132 return --host->sg_len; 133 } 134 135 #define CMDREQ_TIMEOUT 5000 136 137 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) 138 { 139 struct tmio_mmc_host *host = mmc_priv(mmc); 140 141 if (enable && !host->sdio_irq_enabled) { 142 u16 sdio_status; 143 144 /* Keep device active while SDIO irq is enabled */ 145 pm_runtime_get_sync(mmc_dev(mmc)); 146 147 host->sdio_irq_enabled = true; 148 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ; 149 150 /* Clear obsolete interrupts before enabling */ 151 sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS) & ~TMIO_SDIO_MASK_ALL; 152 if (host->pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS) 153 sdio_status |= TMIO_SDIO_SETBITS_MASK; 154 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status); 155 156 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 157 } else if (!enable && host->sdio_irq_enabled) { 158 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 159 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 160 161 host->sdio_irq_enabled = false; 162 pm_runtime_mark_last_busy(mmc_dev(mmc)); 163 pm_runtime_put_autosuspend(mmc_dev(mmc)); 164 } 165 } 166 167 static void tmio_mmc_reset(struct tmio_mmc_host *host) 168 { 169 /* FIXME - should we set stop clock reg here */ 170 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000); 171 usleep_range(10000, 11000); 172 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001); 173 usleep_range(10000, 11000); 174 175 if (host->reset) 176 host->reset(host); 177 178 tmio_mmc_abort_dma(host); 179 180 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) { 181 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 182 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001); 183 } 184 } 185 186 static void tmio_mmc_reset_work(struct work_struct *work) 187 { 188 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 189 delayed_reset_work.work); 190 struct mmc_request *mrq; 191 unsigned long flags; 192 193 spin_lock_irqsave(&host->lock, flags); 194 mrq = host->mrq; 195 196 /* 197 * is request already finished? Since we use a non-blocking 198 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts 199 * us, so, have to check for IS_ERR(host->mrq) 200 */ 201 if (IS_ERR_OR_NULL(mrq) || 202 time_is_after_jiffies(host->last_req_ts + 203 msecs_to_jiffies(CMDREQ_TIMEOUT))) { 204 spin_unlock_irqrestore(&host->lock, flags); 205 return; 206 } 207 208 dev_warn(&host->pdev->dev, 209 "timeout waiting for hardware interrupt (CMD%u)\n", 210 mrq->cmd->opcode); 211 212 if (host->data) 213 host->data->error = -ETIMEDOUT; 214 else if (host->cmd) 215 host->cmd->error = -ETIMEDOUT; 216 else 217 mrq->cmd->error = -ETIMEDOUT; 218 219 host->cmd = NULL; 220 host->data = NULL; 221 222 spin_unlock_irqrestore(&host->lock, flags); 223 224 tmio_mmc_reset(host); 225 226 /* Ready for new calls */ 227 host->mrq = NULL; 228 mmc_request_done(host->mmc, mrq); 229 } 230 231 /* These are the bitmasks the tmio chip requires to implement the MMC response 232 * types. Note that R1 and R6 are the same in this scheme. */ 233 #define APP_CMD 0x0040 234 #define RESP_NONE 0x0300 235 #define RESP_R1 0x0400 236 #define RESP_R1B 0x0500 237 #define RESP_R2 0x0600 238 #define RESP_R3 0x0700 239 #define DATA_PRESENT 0x0800 240 #define TRANSFER_READ 0x1000 241 #define TRANSFER_MULTI 0x2000 242 #define SECURITY_CMD 0x4000 243 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */ 244 245 static int tmio_mmc_start_command(struct tmio_mmc_host *host, 246 struct mmc_command *cmd) 247 { 248 struct mmc_data *data = host->data; 249 int c = cmd->opcode; 250 251 switch (mmc_resp_type(cmd)) { 252 case MMC_RSP_NONE: c |= RESP_NONE; break; 253 case MMC_RSP_R1: 254 case MMC_RSP_R1_NO_CRC: 255 c |= RESP_R1; break; 256 case MMC_RSP_R1B: c |= RESP_R1B; break; 257 case MMC_RSP_R2: c |= RESP_R2; break; 258 case MMC_RSP_R3: c |= RESP_R3; break; 259 default: 260 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd)); 261 return -EINVAL; 262 } 263 264 host->cmd = cmd; 265 266 /* FIXME - this seems to be ok commented out but the spec suggest this bit 267 * should be set when issuing app commands. 268 * if(cmd->flags & MMC_FLAG_ACMD) 269 * c |= APP_CMD; 270 */ 271 if (data) { 272 c |= DATA_PRESENT; 273 if (data->blocks > 1) { 274 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC); 275 c |= TRANSFER_MULTI; 276 277 /* 278 * Disable auto CMD12 at IO_RW_EXTENDED and 279 * SET_BLOCK_COUNT when doing multiple block transfer 280 */ 281 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) && 282 (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc)) 283 c |= NO_CMD12_ISSUE; 284 } 285 if (data->flags & MMC_DATA_READ) 286 c |= TRANSFER_READ; 287 } 288 289 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD); 290 291 /* Fire off the command */ 292 sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg); 293 sd_ctrl_write16(host, CTL_SD_CMD, c); 294 295 return 0; 296 } 297 298 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host, 299 unsigned short *buf, 300 unsigned int count) 301 { 302 int is_read = host->data->flags & MMC_DATA_READ; 303 u8 *buf8; 304 305 /* 306 * Transfer the data 307 */ 308 if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) { 309 u32 data = 0; 310 u32 *buf32 = (u32 *)buf; 311 312 if (is_read) 313 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32, 314 count >> 2); 315 else 316 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32, 317 count >> 2); 318 319 /* if count was multiple of 4 */ 320 if (!(count & 0x3)) 321 return; 322 323 buf32 += count >> 2; 324 count %= 4; 325 326 if (is_read) { 327 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1); 328 memcpy(buf32, &data, count); 329 } else { 330 memcpy(&data, buf32, count); 331 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1); 332 } 333 334 return; 335 } 336 337 if (is_read) 338 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 339 else 340 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 341 342 /* if count was even number */ 343 if (!(count & 0x1)) 344 return; 345 346 /* if count was odd number */ 347 buf8 = (u8 *)(buf + (count >> 1)); 348 349 /* 350 * FIXME 351 * 352 * driver and this function are assuming that 353 * it is used as little endian 354 */ 355 if (is_read) 356 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff; 357 else 358 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8); 359 } 360 361 /* 362 * This chip always returns (at least?) as much data as you ask for. 363 * I'm unsure what happens if you ask for less than a block. This should be 364 * looked into to ensure that a funny length read doesn't hose the controller. 365 */ 366 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host) 367 { 368 struct mmc_data *data = host->data; 369 void *sg_virt; 370 unsigned short *buf; 371 unsigned int count; 372 unsigned long flags; 373 374 if (host->dma_on) { 375 pr_err("PIO IRQ in DMA mode!\n"); 376 return; 377 } else if (!data) { 378 pr_debug("Spurious PIO IRQ\n"); 379 return; 380 } 381 382 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags); 383 buf = (unsigned short *)(sg_virt + host->sg_off); 384 385 count = host->sg_ptr->length - host->sg_off; 386 if (count > data->blksz) 387 count = data->blksz; 388 389 pr_debug("count: %08x offset: %08x flags %08x\n", 390 count, host->sg_off, data->flags); 391 392 /* Transfer the data */ 393 tmio_mmc_transfer_data(host, buf, count); 394 395 host->sg_off += count; 396 397 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt); 398 399 if (host->sg_off == host->sg_ptr->length) 400 tmio_mmc_next_sg(host); 401 } 402 403 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) 404 { 405 if (host->sg_ptr == &host->bounce_sg) { 406 unsigned long flags; 407 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags); 408 409 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length); 410 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr); 411 } 412 } 413 414 /* needs to be called with host->lock held */ 415 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) 416 { 417 struct mmc_data *data = host->data; 418 struct mmc_command *stop; 419 420 host->data = NULL; 421 422 if (!data) { 423 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n"); 424 return; 425 } 426 stop = data->stop; 427 428 /* FIXME - return correct transfer count on errors */ 429 if (!data->error) 430 data->bytes_xfered = data->blocks * data->blksz; 431 else 432 data->bytes_xfered = 0; 433 434 pr_debug("Completed data request\n"); 435 436 /* 437 * FIXME: other drivers allow an optional stop command of any given type 438 * which we dont do, as the chip can auto generate them. 439 * Perhaps we can be smarter about when to use auto CMD12 and 440 * only issue the auto request when we know this is the desired 441 * stop command, allowing fallback to the stop command the 442 * upper layers expect. For now, we do what works. 443 */ 444 445 if (data->flags & MMC_DATA_READ) { 446 if (host->dma_on) 447 tmio_mmc_check_bounce_buffer(host); 448 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n", 449 host->mrq); 450 } else { 451 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n", 452 host->mrq); 453 } 454 455 if (stop && !host->mrq->sbc) { 456 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg) 457 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n", 458 stop->opcode, stop->arg); 459 460 /* fill in response from auto CMD12 */ 461 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE); 462 463 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0); 464 } 465 466 schedule_work(&host->done); 467 } 468 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq); 469 470 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat) 471 { 472 struct mmc_data *data; 473 474 spin_lock(&host->lock); 475 data = host->data; 476 477 if (!data) 478 goto out; 479 480 if (stat & TMIO_STAT_DATATIMEOUT) 481 data->error = -ETIMEDOUT; 482 else 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 void tmio_process_mrq(struct tmio_mmc_host *host, 718 struct mmc_request *mrq) 719 { 720 struct mmc_command *cmd; 721 int ret; 722 723 if (mrq->sbc && host->cmd != mrq->sbc) { 724 cmd = mrq->sbc; 725 } else { 726 cmd = mrq->cmd; 727 if (mrq->data) { 728 ret = tmio_mmc_start_data(host, mrq->data); 729 if (ret) 730 goto fail; 731 } 732 } 733 734 ret = tmio_mmc_start_command(host, cmd); 735 if (ret) 736 goto fail; 737 738 schedule_delayed_work(&host->delayed_reset_work, 739 msecs_to_jiffies(CMDREQ_TIMEOUT)); 740 return; 741 742 fail: 743 host->mrq = NULL; 744 mrq->cmd->error = ret; 745 mmc_request_done(host->mmc, mrq); 746 } 747 748 /* Process requests from the MMC layer */ 749 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 750 { 751 struct tmio_mmc_host *host = mmc_priv(mmc); 752 unsigned long flags; 753 754 spin_lock_irqsave(&host->lock, flags); 755 756 if (host->mrq) { 757 pr_debug("request not null\n"); 758 if (IS_ERR(host->mrq)) { 759 spin_unlock_irqrestore(&host->lock, flags); 760 mrq->cmd->error = -EAGAIN; 761 mmc_request_done(mmc, mrq); 762 return; 763 } 764 } 765 766 host->last_req_ts = jiffies; 767 wmb(); 768 host->mrq = mrq; 769 770 spin_unlock_irqrestore(&host->lock, flags); 771 772 tmio_process_mrq(host, mrq); 773 } 774 775 static void tmio_mmc_finish_request(struct tmio_mmc_host *host) 776 { 777 struct mmc_request *mrq; 778 unsigned long flags; 779 780 spin_lock_irqsave(&host->lock, flags); 781 782 tmio_mmc_end_dma(host); 783 784 mrq = host->mrq; 785 if (IS_ERR_OR_NULL(mrq)) { 786 spin_unlock_irqrestore(&host->lock, flags); 787 return; 788 } 789 790 /* If not SET_BLOCK_COUNT, clear old data */ 791 if (host->cmd != mrq->sbc) { 792 host->cmd = NULL; 793 host->data = NULL; 794 host->mrq = NULL; 795 } 796 797 cancel_delayed_work(&host->delayed_reset_work); 798 799 spin_unlock_irqrestore(&host->lock, flags); 800 801 if (mrq->cmd->error || (mrq->data && mrq->data->error)) { 802 tmio_mmc_ack_mmc_irqs(host, TMIO_MASK_IRQ); /* Clear all */ 803 tmio_mmc_abort_dma(host); 804 } 805 806 /* Error means retune, but executed command was still successful */ 807 if (host->check_retune && host->check_retune(host, mrq)) 808 mmc_retune_needed(host->mmc); 809 810 /* If SET_BLOCK_COUNT, continue with main command */ 811 if (host->mrq && !mrq->cmd->error) { 812 tmio_process_mrq(host, mrq); 813 return; 814 } 815 816 if (host->fixup_request) 817 host->fixup_request(host, mrq); 818 819 mmc_request_done(host->mmc, mrq); 820 } 821 822 static void tmio_mmc_done_work(struct work_struct *work) 823 { 824 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 825 done); 826 tmio_mmc_finish_request(host); 827 } 828 829 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd) 830 { 831 struct mmc_host *mmc = host->mmc; 832 int ret = 0; 833 834 /* .set_ios() is returning void, so, no chance to report an error */ 835 836 if (host->set_pwr) 837 host->set_pwr(host->pdev, 1); 838 839 if (!IS_ERR(mmc->supply.vmmc)) { 840 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 841 /* 842 * Attention: empiric value. With a b43 WiFi SDIO card this 843 * delay proved necessary for reliable card-insertion probing. 844 * 100us were not enough. Is this the same 140us delay, as in 845 * tmio_mmc_set_ios()? 846 */ 847 usleep_range(200, 300); 848 } 849 /* 850 * It seems, VccQ should be switched on after Vcc, this is also what the 851 * omap_hsmmc.c driver does. 852 */ 853 if (!IS_ERR(mmc->supply.vqmmc) && !ret) { 854 ret = regulator_enable(mmc->supply.vqmmc); 855 usleep_range(200, 300); 856 } 857 858 if (ret < 0) 859 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n", 860 ret); 861 } 862 863 static void tmio_mmc_power_off(struct tmio_mmc_host *host) 864 { 865 struct mmc_host *mmc = host->mmc; 866 867 if (!IS_ERR(mmc->supply.vqmmc)) 868 regulator_disable(mmc->supply.vqmmc); 869 870 if (!IS_ERR(mmc->supply.vmmc)) 871 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 872 873 if (host->set_pwr) 874 host->set_pwr(host->pdev, 0); 875 } 876 877 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host, 878 unsigned char bus_width) 879 { 880 u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT) 881 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8); 882 883 /* reg now applies to MMC_BUS_WIDTH_4 */ 884 if (bus_width == MMC_BUS_WIDTH_1) 885 reg |= CARD_OPT_WIDTH; 886 else if (bus_width == MMC_BUS_WIDTH_8) 887 reg |= CARD_OPT_WIDTH8; 888 889 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg); 890 } 891 892 static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host) 893 { 894 u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); 895 896 val = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT; 897 return 1 << (13 + val); 898 } 899 900 static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host) 901 { 902 unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max; 903 904 host->mmc->max_busy_timeout = host->get_timeout_cycles(host) / 905 (clk_rate / MSEC_PER_SEC); 906 } 907 908 /* Set MMC clock / power. 909 * Note: This controller uses a simple divider scheme therefore it cannot 910 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as 911 * MMC wont run that fast, it has to be clocked at 12MHz which is the next 912 * slowest setting. 913 */ 914 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 915 { 916 struct tmio_mmc_host *host = mmc_priv(mmc); 917 struct device *dev = &host->pdev->dev; 918 unsigned long flags; 919 920 mutex_lock(&host->ios_lock); 921 922 spin_lock_irqsave(&host->lock, flags); 923 if (host->mrq) { 924 if (IS_ERR(host->mrq)) { 925 dev_dbg(dev, 926 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n", 927 current->comm, task_pid_nr(current), 928 ios->clock, ios->power_mode); 929 host->mrq = ERR_PTR(-EINTR); 930 } else { 931 dev_dbg(dev, 932 "%s.%d: CMD%u active since %lu, now %lu!\n", 933 current->comm, task_pid_nr(current), 934 host->mrq->cmd->opcode, host->last_req_ts, 935 jiffies); 936 } 937 spin_unlock_irqrestore(&host->lock, flags); 938 939 mutex_unlock(&host->ios_lock); 940 return; 941 } 942 943 host->mrq = ERR_PTR(-EBUSY); 944 945 spin_unlock_irqrestore(&host->lock, flags); 946 947 switch (ios->power_mode) { 948 case MMC_POWER_OFF: 949 tmio_mmc_power_off(host); 950 /* For R-Car Gen2+, we need to reset SDHI specific SCC */ 951 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 952 host->reset(host); 953 host->set_clock(host, 0); 954 break; 955 case MMC_POWER_UP: 956 tmio_mmc_power_on(host, ios->vdd); 957 host->set_clock(host, ios->clock); 958 tmio_mmc_set_bus_width(host, ios->bus_width); 959 break; 960 case MMC_POWER_ON: 961 host->set_clock(host, ios->clock); 962 tmio_mmc_set_bus_width(host, ios->bus_width); 963 break; 964 } 965 966 if (host->pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT) 967 tmio_mmc_max_busy_timeout(host); 968 969 /* Let things settle. delay taken from winCE driver */ 970 usleep_range(140, 200); 971 if (PTR_ERR(host->mrq) == -EINTR) 972 dev_dbg(&host->pdev->dev, 973 "%s.%d: IOS interrupted: clk %u, mode %u", 974 current->comm, task_pid_nr(current), 975 ios->clock, ios->power_mode); 976 host->mrq = NULL; 977 978 host->clk_cache = ios->clock; 979 980 mutex_unlock(&host->ios_lock); 981 } 982 983 static int tmio_mmc_get_ro(struct mmc_host *mmc) 984 { 985 struct tmio_mmc_host *host = mmc_priv(mmc); 986 987 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 988 TMIO_STAT_WRPROTECT); 989 } 990 991 static int tmio_mmc_get_cd(struct mmc_host *mmc) 992 { 993 struct tmio_mmc_host *host = mmc_priv(mmc); 994 995 return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 996 TMIO_STAT_SIGSTATE); 997 } 998 999 static int tmio_multi_io_quirk(struct mmc_card *card, 1000 unsigned int direction, int blk_size) 1001 { 1002 struct tmio_mmc_host *host = mmc_priv(card->host); 1003 1004 if (host->multi_io_quirk) 1005 return host->multi_io_quirk(card, direction, blk_size); 1006 1007 return blk_size; 1008 } 1009 1010 static struct mmc_host_ops tmio_mmc_ops = { 1011 .request = tmio_mmc_request, 1012 .set_ios = tmio_mmc_set_ios, 1013 .get_ro = tmio_mmc_get_ro, 1014 .get_cd = tmio_mmc_get_cd, 1015 .enable_sdio_irq = tmio_mmc_enable_sdio_irq, 1016 .multi_io_quirk = tmio_multi_io_quirk, 1017 }; 1018 1019 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host) 1020 { 1021 struct tmio_mmc_data *pdata = host->pdata; 1022 struct mmc_host *mmc = host->mmc; 1023 int err; 1024 1025 err = mmc_regulator_get_supply(mmc); 1026 if (err) 1027 return err; 1028 1029 /* use ocr_mask if no regulator */ 1030 if (!mmc->ocr_avail) 1031 mmc->ocr_avail = pdata->ocr_mask; 1032 1033 /* 1034 * try again. 1035 * There is possibility that regulator has not been probed 1036 */ 1037 if (!mmc->ocr_avail) 1038 return -EPROBE_DEFER; 1039 1040 return 0; 1041 } 1042 1043 static void tmio_mmc_of_parse(struct platform_device *pdev, 1044 struct mmc_host *mmc) 1045 { 1046 const struct device_node *np = pdev->dev.of_node; 1047 1048 if (!np) 1049 return; 1050 1051 /* 1052 * DEPRECATED: 1053 * For new platforms, please use "disable-wp" instead of 1054 * "toshiba,mmc-wrprotect-disable" 1055 */ 1056 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL)) 1057 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT; 1058 } 1059 1060 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev, 1061 struct tmio_mmc_data *pdata) 1062 { 1063 struct tmio_mmc_host *host; 1064 struct mmc_host *mmc; 1065 void __iomem *ctl; 1066 int ret; 1067 1068 ctl = devm_platform_ioremap_resource(pdev, 0); 1069 if (IS_ERR(ctl)) 1070 return ERR_CAST(ctl); 1071 1072 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev); 1073 if (!mmc) 1074 return ERR_PTR(-ENOMEM); 1075 1076 host = mmc_priv(mmc); 1077 host->ctl = ctl; 1078 host->mmc = mmc; 1079 host->pdev = pdev; 1080 host->pdata = pdata; 1081 host->ops = tmio_mmc_ops; 1082 mmc->ops = &host->ops; 1083 1084 ret = mmc_of_parse(host->mmc); 1085 if (ret) { 1086 host = ERR_PTR(ret); 1087 goto free; 1088 } 1089 1090 tmio_mmc_of_parse(pdev, mmc); 1091 1092 platform_set_drvdata(pdev, host); 1093 1094 return host; 1095 free: 1096 mmc_free_host(mmc); 1097 1098 return host; 1099 } 1100 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc); 1101 1102 void tmio_mmc_host_free(struct tmio_mmc_host *host) 1103 { 1104 mmc_free_host(host->mmc); 1105 } 1106 EXPORT_SYMBOL_GPL(tmio_mmc_host_free); 1107 1108 int tmio_mmc_host_probe(struct tmio_mmc_host *_host) 1109 { 1110 struct platform_device *pdev = _host->pdev; 1111 struct tmio_mmc_data *pdata = _host->pdata; 1112 struct mmc_host *mmc = _host->mmc; 1113 int ret; 1114 1115 /* 1116 * Check the sanity of mmc->f_min to prevent host->set_clock() from 1117 * looping forever... 1118 */ 1119 if (mmc->f_min == 0) 1120 return -EINVAL; 1121 1122 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT)) 1123 _host->write16_hook = NULL; 1124 1125 if (pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT && !_host->get_timeout_cycles) 1126 _host->get_timeout_cycles = tmio_mmc_get_timeout_cycles; 1127 1128 _host->set_pwr = pdata->set_pwr; 1129 1130 ret = tmio_mmc_init_ocr(_host); 1131 if (ret < 0) 1132 return ret; 1133 1134 /* 1135 * Look for a card detect GPIO, if it fails with anything 1136 * else than a probe deferral, just live without it. 1137 */ 1138 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0); 1139 if (ret == -EPROBE_DEFER) 1140 return ret; 1141 1142 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities; 1143 mmc->caps2 |= pdata->capabilities2; 1144 mmc->max_segs = pdata->max_segs ? : 32; 1145 mmc->max_blk_size = TMIO_MAX_BLK_SIZE; 1146 mmc->max_blk_count = pdata->max_blk_count ? : 1147 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs; 1148 mmc->max_req_size = min_t(size_t, 1149 mmc->max_blk_size * mmc->max_blk_count, 1150 dma_max_mapping_size(&pdev->dev)); 1151 mmc->max_seg_size = mmc->max_req_size; 1152 1153 if (mmc_can_gpio_ro(mmc)) 1154 _host->ops.get_ro = mmc_gpio_get_ro; 1155 1156 if (mmc_can_gpio_cd(mmc)) 1157 _host->ops.get_cd = mmc_gpio_get_cd; 1158 1159 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) || 1160 mmc->caps & MMC_CAP_NEEDS_POLL || 1161 !mmc_card_is_removable(mmc)); 1162 1163 /* 1164 * On Gen2+, eMMC with NONREMOVABLE currently fails because native 1165 * hotplug gets disabled. It seems RuntimePM related yet we need further 1166 * research. Since we are planning a PM overhaul anyway, let's enforce 1167 * for now the device being active by enabling native hotplug always. 1168 */ 1169 if (pdata->flags & TMIO_MMC_MIN_RCAR2) 1170 _host->native_hotplug = true; 1171 1172 /* 1173 * While using internal tmio hardware logic for card detection, we need 1174 * to ensure it stays powered for it to work. 1175 */ 1176 if (_host->native_hotplug) 1177 pm_runtime_get_noresume(&pdev->dev); 1178 1179 _host->sdio_irq_enabled = false; 1180 if (pdata->flags & TMIO_MMC_SDIO_IRQ) 1181 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 1182 1183 _host->set_clock(_host, 0); 1184 tmio_mmc_reset(_host); 1185 1186 _host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK); 1187 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL); 1188 1189 if (_host->native_hotplug) 1190 tmio_mmc_enable_mmc_irqs(_host, 1191 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT); 1192 1193 spin_lock_init(&_host->lock); 1194 mutex_init(&_host->ios_lock); 1195 1196 /* Init delayed work for request timeouts */ 1197 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work); 1198 INIT_WORK(&_host->done, tmio_mmc_done_work); 1199 1200 /* See if we also get DMA */ 1201 tmio_mmc_request_dma(_host, pdata); 1202 1203 pm_runtime_get_noresume(&pdev->dev); 1204 pm_runtime_set_active(&pdev->dev); 1205 pm_runtime_set_autosuspend_delay(&pdev->dev, 50); 1206 pm_runtime_use_autosuspend(&pdev->dev); 1207 pm_runtime_enable(&pdev->dev); 1208 1209 ret = mmc_add_host(mmc); 1210 if (ret) 1211 goto remove_host; 1212 1213 dev_pm_qos_expose_latency_limit(&pdev->dev, 100); 1214 pm_runtime_put(&pdev->dev); 1215 1216 return 0; 1217 1218 remove_host: 1219 pm_runtime_put_noidle(&pdev->dev); 1220 tmio_mmc_host_remove(_host); 1221 return ret; 1222 } 1223 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe); 1224 1225 void tmio_mmc_host_remove(struct tmio_mmc_host *host) 1226 { 1227 struct platform_device *pdev = host->pdev; 1228 struct mmc_host *mmc = host->mmc; 1229 1230 pm_runtime_get_sync(&pdev->dev); 1231 1232 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) 1233 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); 1234 1235 dev_pm_qos_hide_latency_limit(&pdev->dev); 1236 1237 mmc_remove_host(mmc); 1238 cancel_work_sync(&host->done); 1239 cancel_delayed_work_sync(&host->delayed_reset_work); 1240 tmio_mmc_release_dma(host); 1241 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL); 1242 1243 if (host->native_hotplug) 1244 pm_runtime_put_noidle(&pdev->dev); 1245 1246 pm_runtime_disable(&pdev->dev); 1247 pm_runtime_dont_use_autosuspend(&pdev->dev); 1248 pm_runtime_put_noidle(&pdev->dev); 1249 } 1250 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove); 1251 1252 #ifdef CONFIG_PM 1253 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host) 1254 { 1255 if (!host->clk_enable) 1256 return -ENOTSUPP; 1257 1258 return host->clk_enable(host); 1259 } 1260 1261 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host) 1262 { 1263 if (host->clk_disable) 1264 host->clk_disable(host); 1265 } 1266 1267 int tmio_mmc_host_runtime_suspend(struct device *dev) 1268 { 1269 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1270 1271 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL); 1272 1273 if (host->clk_cache) 1274 host->set_clock(host, 0); 1275 1276 tmio_mmc_clk_disable(host); 1277 1278 return 0; 1279 } 1280 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend); 1281 1282 int tmio_mmc_host_runtime_resume(struct device *dev) 1283 { 1284 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1285 1286 tmio_mmc_clk_enable(host); 1287 tmio_mmc_reset(host); 1288 1289 if (host->clk_cache) 1290 host->set_clock(host, host->clk_cache); 1291 1292 if (host->native_hotplug) 1293 tmio_mmc_enable_mmc_irqs(host, 1294 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT); 1295 1296 tmio_mmc_enable_dma(host, true); 1297 1298 mmc_retune_needed(host->mmc); 1299 1300 return 0; 1301 } 1302 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume); 1303 #endif 1304 1305 MODULE_LICENSE("GPL v2"); 1306