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