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_set_bus_width(struct tmio_mmc_host *host, 168 unsigned char bus_width) 169 { 170 u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT) 171 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8); 172 173 /* reg now applies to MMC_BUS_WIDTH_4 */ 174 if (bus_width == MMC_BUS_WIDTH_1) 175 reg |= CARD_OPT_WIDTH; 176 else if (bus_width == MMC_BUS_WIDTH_8) 177 reg |= CARD_OPT_WIDTH8; 178 179 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg); 180 } 181 182 static void tmio_mmc_reset(struct tmio_mmc_host *host, bool preserve) 183 { 184 u16 card_opt, clk_ctrl, sdif_mode; 185 186 if (preserve) { 187 card_opt = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); 188 clk_ctrl = sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL); 189 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 190 sdif_mode = sd_ctrl_read16(host, CTL_SDIF_MODE); 191 } 192 193 /* FIXME - should we set stop clock reg here */ 194 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000); 195 usleep_range(10000, 11000); 196 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001); 197 usleep_range(10000, 11000); 198 199 tmio_mmc_abort_dma(host); 200 201 if (host->reset) 202 host->reset(host, preserve); 203 204 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask_all); 205 host->sdcard_irq_mask = host->sdcard_irq_mask_all; 206 207 if (host->native_hotplug) 208 tmio_mmc_enable_mmc_irqs(host, 209 TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT); 210 211 tmio_mmc_set_bus_width(host, host->mmc->ios.bus_width); 212 213 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) { 214 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 215 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001); 216 } 217 218 if (preserve) { 219 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, card_opt); 220 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk_ctrl); 221 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 222 sd_ctrl_write16(host, CTL_SDIF_MODE, sdif_mode); 223 } 224 225 if (host->mmc->card) 226 mmc_retune_needed(host->mmc); 227 } 228 229 static void tmio_mmc_reset_work(struct work_struct *work) 230 { 231 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 232 delayed_reset_work.work); 233 struct mmc_request *mrq; 234 unsigned long flags; 235 236 spin_lock_irqsave(&host->lock, flags); 237 mrq = host->mrq; 238 239 /* 240 * is request already finished? Since we use a non-blocking 241 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts 242 * us, so, have to check for IS_ERR(host->mrq) 243 */ 244 if (IS_ERR_OR_NULL(mrq) || 245 time_is_after_jiffies(host->last_req_ts + 246 msecs_to_jiffies(CMDREQ_TIMEOUT))) { 247 spin_unlock_irqrestore(&host->lock, flags); 248 return; 249 } 250 251 dev_warn(&host->pdev->dev, 252 "timeout waiting for hardware interrupt (CMD%u)\n", 253 mrq->cmd->opcode); 254 255 if (host->data) 256 host->data->error = -ETIMEDOUT; 257 else if (host->cmd) 258 host->cmd->error = -ETIMEDOUT; 259 else 260 mrq->cmd->error = -ETIMEDOUT; 261 262 host->cmd = NULL; 263 host->data = NULL; 264 265 spin_unlock_irqrestore(&host->lock, flags); 266 267 tmio_mmc_reset(host, true); 268 269 /* Ready for new calls */ 270 host->mrq = NULL; 271 mmc_request_done(host->mmc, mrq); 272 } 273 274 /* These are the bitmasks the tmio chip requires to implement the MMC response 275 * types. Note that R1 and R6 are the same in this scheme. */ 276 #define APP_CMD 0x0040 277 #define RESP_NONE 0x0300 278 #define RESP_R1 0x0400 279 #define RESP_R1B 0x0500 280 #define RESP_R2 0x0600 281 #define RESP_R3 0x0700 282 #define DATA_PRESENT 0x0800 283 #define TRANSFER_READ 0x1000 284 #define TRANSFER_MULTI 0x2000 285 #define SECURITY_CMD 0x4000 286 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */ 287 288 static int tmio_mmc_start_command(struct tmio_mmc_host *host, 289 struct mmc_command *cmd) 290 { 291 struct mmc_data *data = host->data; 292 int c = cmd->opcode; 293 294 switch (mmc_resp_type(cmd)) { 295 case MMC_RSP_NONE: c |= RESP_NONE; break; 296 case MMC_RSP_R1: 297 case MMC_RSP_R1_NO_CRC: 298 c |= RESP_R1; break; 299 case MMC_RSP_R1B: c |= RESP_R1B; break; 300 case MMC_RSP_R2: c |= RESP_R2; break; 301 case MMC_RSP_R3: c |= RESP_R3; break; 302 default: 303 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd)); 304 return -EINVAL; 305 } 306 307 host->cmd = cmd; 308 309 /* FIXME - this seems to be ok commented out but the spec suggest this bit 310 * should be set when issuing app commands. 311 * if(cmd->flags & MMC_FLAG_ACMD) 312 * c |= APP_CMD; 313 */ 314 if (data) { 315 c |= DATA_PRESENT; 316 if (data->blocks > 1) { 317 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC); 318 c |= TRANSFER_MULTI; 319 320 /* 321 * Disable auto CMD12 at IO_RW_EXTENDED and 322 * SET_BLOCK_COUNT when doing multiple block transfer 323 */ 324 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) && 325 (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc)) 326 c |= NO_CMD12_ISSUE; 327 } 328 if (data->flags & MMC_DATA_READ) 329 c |= TRANSFER_READ; 330 } 331 332 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_CMD); 333 334 /* Fire off the command */ 335 sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg); 336 sd_ctrl_write16(host, CTL_SD_CMD, c); 337 338 return 0; 339 } 340 341 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host, 342 unsigned short *buf, 343 unsigned int count) 344 { 345 int is_read = host->data->flags & MMC_DATA_READ; 346 u8 *buf8; 347 348 /* 349 * Transfer the data 350 */ 351 if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) { 352 u32 data = 0; 353 u32 *buf32 = (u32 *)buf; 354 355 if (is_read) 356 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32, 357 count >> 2); 358 else 359 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32, 360 count >> 2); 361 362 /* if count was multiple of 4 */ 363 if (!(count & 0x3)) 364 return; 365 366 buf32 += count >> 2; 367 count %= 4; 368 369 if (is_read) { 370 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1); 371 memcpy(buf32, &data, count); 372 } else { 373 memcpy(&data, buf32, count); 374 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1); 375 } 376 377 return; 378 } 379 380 if (is_read) 381 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 382 else 383 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 384 385 /* if count was even number */ 386 if (!(count & 0x1)) 387 return; 388 389 /* if count was odd number */ 390 buf8 = (u8 *)(buf + (count >> 1)); 391 392 /* 393 * FIXME 394 * 395 * driver and this function are assuming that 396 * it is used as little endian 397 */ 398 if (is_read) 399 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff; 400 else 401 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8); 402 } 403 404 /* 405 * This chip always returns (at least?) as much data as you ask for. 406 * I'm unsure what happens if you ask for less than a block. This should be 407 * looked into to ensure that a funny length read doesn't hose the controller. 408 */ 409 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host) 410 { 411 struct mmc_data *data = host->data; 412 void *sg_virt; 413 unsigned short *buf; 414 unsigned int count; 415 unsigned long flags; 416 417 if (host->dma_on) { 418 pr_err("PIO IRQ in DMA mode!\n"); 419 return; 420 } else if (!data) { 421 pr_debug("Spurious PIO IRQ\n"); 422 return; 423 } 424 425 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags); 426 buf = (unsigned short *)(sg_virt + host->sg_off); 427 428 count = host->sg_ptr->length - host->sg_off; 429 if (count > data->blksz) 430 count = data->blksz; 431 432 pr_debug("count: %08x offset: %08x flags %08x\n", 433 count, host->sg_off, data->flags); 434 435 /* Transfer the data */ 436 tmio_mmc_transfer_data(host, buf, count); 437 438 host->sg_off += count; 439 440 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt); 441 442 if (host->sg_off == host->sg_ptr->length) 443 tmio_mmc_next_sg(host); 444 } 445 446 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) 447 { 448 if (host->sg_ptr == &host->bounce_sg) { 449 unsigned long flags; 450 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags); 451 452 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length); 453 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr); 454 } 455 } 456 457 /* needs to be called with host->lock held */ 458 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) 459 { 460 struct mmc_data *data = host->data; 461 struct mmc_command *stop; 462 463 host->data = NULL; 464 465 if (!data) { 466 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n"); 467 return; 468 } 469 stop = data->stop; 470 471 /* FIXME - return correct transfer count on errors */ 472 if (!data->error) 473 data->bytes_xfered = data->blocks * data->blksz; 474 else 475 data->bytes_xfered = 0; 476 477 pr_debug("Completed data request\n"); 478 479 /* 480 * FIXME: other drivers allow an optional stop command of any given type 481 * which we dont do, as the chip can auto generate them. 482 * Perhaps we can be smarter about when to use auto CMD12 and 483 * only issue the auto request when we know this is the desired 484 * stop command, allowing fallback to the stop command the 485 * upper layers expect. For now, we do what works. 486 */ 487 488 if (data->flags & MMC_DATA_READ) { 489 if (host->dma_on) 490 tmio_mmc_check_bounce_buffer(host); 491 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n", 492 host->mrq); 493 } else { 494 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n", 495 host->mrq); 496 } 497 498 if (stop && !host->mrq->sbc) { 499 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg) 500 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n", 501 stop->opcode, stop->arg); 502 503 /* fill in response from auto CMD12 */ 504 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE); 505 506 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0); 507 } 508 509 schedule_work(&host->done); 510 } 511 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq); 512 513 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat) 514 { 515 struct mmc_data *data; 516 517 spin_lock(&host->lock); 518 data = host->data; 519 520 if (!data) 521 goto out; 522 523 if (stat & TMIO_STAT_DATATIMEOUT) 524 data->error = -ETIMEDOUT; 525 else if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR || 526 stat & TMIO_STAT_TXUNDERRUN) 527 data->error = -EILSEQ; 528 if (host->dma_on && (data->flags & MMC_DATA_WRITE)) { 529 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 530 bool done = false; 531 532 /* 533 * Has all data been written out yet? Testing on SuperH showed, 534 * that in most cases the first interrupt comes already with the 535 * BUSY status bit clear, but on some operations, like mount or 536 * in the beginning of a write / sync / umount, there is one 537 * DATAEND interrupt with the BUSY bit set, in this cases 538 * waiting for one more interrupt fixes the problem. 539 */ 540 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) { 541 if (status & TMIO_STAT_SCLKDIVEN) 542 done = true; 543 } else { 544 if (!(status & TMIO_STAT_CMD_BUSY)) 545 done = true; 546 } 547 548 if (done) { 549 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 550 tmio_mmc_dataend_dma(host); 551 } 552 } else if (host->dma_on && (data->flags & MMC_DATA_READ)) { 553 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 554 tmio_mmc_dataend_dma(host); 555 } else { 556 tmio_mmc_do_data_irq(host); 557 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP); 558 } 559 out: 560 spin_unlock(&host->lock); 561 } 562 563 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat) 564 { 565 struct mmc_command *cmd = host->cmd; 566 int i, addr; 567 568 spin_lock(&host->lock); 569 570 if (!host->cmd) { 571 pr_debug("Spurious CMD irq\n"); 572 goto out; 573 } 574 575 /* This controller is sicker than the PXA one. Not only do we need to 576 * drop the top 8 bits of the first response word, we also need to 577 * modify the order of the response for short response command types. 578 */ 579 580 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4) 581 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr); 582 583 if (cmd->flags & MMC_RSP_136) { 584 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24); 585 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24); 586 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24); 587 cmd->resp[3] <<= 8; 588 } else if (cmd->flags & MMC_RSP_R3) { 589 cmd->resp[0] = cmd->resp[3]; 590 } 591 592 if (stat & TMIO_STAT_CMDTIMEOUT) 593 cmd->error = -ETIMEDOUT; 594 else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) || 595 stat & TMIO_STAT_STOPBIT_ERR || 596 stat & TMIO_STAT_CMD_IDX_ERR) 597 cmd->error = -EILSEQ; 598 599 /* If there is data to handle we enable data IRQs here, and 600 * we will ultimatley finish the request in the data_end handler. 601 * If theres no data or we encountered an error, finish now. 602 */ 603 if (host->data && (!cmd->error || cmd->error == -EILSEQ)) { 604 if (host->data->flags & MMC_DATA_READ) { 605 if (!host->dma_on) { 606 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP); 607 } else { 608 tmio_mmc_disable_mmc_irqs(host, 609 TMIO_MASK_READOP); 610 tasklet_schedule(&host->dma_issue); 611 } 612 } else { 613 if (!host->dma_on) { 614 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP); 615 } else { 616 tmio_mmc_disable_mmc_irqs(host, 617 TMIO_MASK_WRITEOP); 618 tasklet_schedule(&host->dma_issue); 619 } 620 } 621 } else { 622 schedule_work(&host->done); 623 } 624 625 out: 626 spin_unlock(&host->lock); 627 } 628 629 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host, 630 int ireg, int status) 631 { 632 struct mmc_host *mmc = host->mmc; 633 634 /* Card insert / remove attempts */ 635 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) { 636 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT | 637 TMIO_STAT_CARD_REMOVE); 638 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) || 639 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) && 640 !work_pending(&mmc->detect.work)) 641 mmc_detect_change(host->mmc, msecs_to_jiffies(100)); 642 return true; 643 } 644 645 return false; 646 } 647 648 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg, 649 int status) 650 { 651 /* Command completion */ 652 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) { 653 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND | 654 TMIO_STAT_CMDTIMEOUT); 655 tmio_mmc_cmd_irq(host, status); 656 return true; 657 } 658 659 /* Data transfer */ 660 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) { 661 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ); 662 tmio_mmc_pio_irq(host); 663 return true; 664 } 665 666 /* Data transfer completion */ 667 if (ireg & TMIO_STAT_DATAEND) { 668 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND); 669 tmio_mmc_data_irq(host, status); 670 return true; 671 } 672 673 return false; 674 } 675 676 static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) 677 { 678 struct mmc_host *mmc = host->mmc; 679 struct tmio_mmc_data *pdata = host->pdata; 680 unsigned int ireg, status; 681 unsigned int sdio_status; 682 683 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ)) 684 return false; 685 686 status = sd_ctrl_read16(host, CTL_SDIO_STATUS); 687 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask; 688 689 sdio_status = status & ~TMIO_SDIO_MASK_ALL; 690 if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS) 691 sdio_status |= TMIO_SDIO_SETBITS_MASK; 692 693 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status); 694 695 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ) 696 mmc_signal_sdio_irq(mmc); 697 698 return ireg; 699 } 700 701 irqreturn_t tmio_mmc_irq(int irq, void *devid) 702 { 703 struct tmio_mmc_host *host = devid; 704 unsigned int ireg, status; 705 706 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 707 ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask; 708 709 /* Clear the status except the interrupt status */ 710 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ); 711 712 if (__tmio_mmc_card_detect_irq(host, ireg, status)) 713 return IRQ_HANDLED; 714 if (__tmio_mmc_sdcard_irq(host, ireg, status)) 715 return IRQ_HANDLED; 716 717 if (__tmio_mmc_sdio_irq(host)) 718 return IRQ_HANDLED; 719 720 return IRQ_NONE; 721 } 722 EXPORT_SYMBOL_GPL(tmio_mmc_irq); 723 724 static int tmio_mmc_start_data(struct tmio_mmc_host *host, 725 struct mmc_data *data) 726 { 727 struct tmio_mmc_data *pdata = host->pdata; 728 729 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n", 730 data->blksz, data->blocks); 731 732 /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */ 733 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 || 734 host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) { 735 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES; 736 737 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) { 738 pr_err("%s: %d byte block unsupported in 4/8 bit mode\n", 739 mmc_hostname(host->mmc), data->blksz); 740 return -EINVAL; 741 } 742 } 743 744 tmio_mmc_init_sg(host, data); 745 host->data = data; 746 host->dma_on = false; 747 748 /* Set transfer length / blocksize */ 749 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz); 750 if (host->mmc->max_blk_count >= SZ_64K) 751 sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks); 752 else 753 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks); 754 755 tmio_mmc_start_dma(host, data); 756 757 return 0; 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 tmio_mmc_end_dma(host); 826 827 mrq = host->mrq; 828 if (IS_ERR_OR_NULL(mrq)) { 829 spin_unlock_irqrestore(&host->lock, flags); 830 return; 831 } 832 833 /* If not SET_BLOCK_COUNT, clear old data */ 834 if (host->cmd != mrq->sbc) { 835 host->cmd = NULL; 836 host->data = NULL; 837 host->mrq = NULL; 838 } 839 840 cancel_delayed_work(&host->delayed_reset_work); 841 842 spin_unlock_irqrestore(&host->lock, flags); 843 844 if (mrq->cmd->error || (mrq->data && mrq->data->error)) { 845 tmio_mmc_ack_mmc_irqs(host, TMIO_MASK_IRQ); /* Clear all */ 846 tmio_mmc_abort_dma(host); 847 } 848 849 /* Error means retune, but executed command was still successful */ 850 if (host->check_retune && host->check_retune(host, mrq)) 851 mmc_retune_needed(host->mmc); 852 853 /* If SET_BLOCK_COUNT, continue with main command */ 854 if (host->mrq && !mrq->cmd->error) { 855 tmio_process_mrq(host, mrq); 856 return; 857 } 858 859 if (host->fixup_request) 860 host->fixup_request(host, mrq); 861 862 mmc_request_done(host->mmc, mrq); 863 } 864 865 static void tmio_mmc_done_work(struct work_struct *work) 866 { 867 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 868 done); 869 tmio_mmc_finish_request(host); 870 } 871 872 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd) 873 { 874 struct mmc_host *mmc = host->mmc; 875 int ret = 0; 876 877 /* .set_ios() is returning void, so, no chance to report an error */ 878 879 if (host->set_pwr) 880 host->set_pwr(host->pdev, 1); 881 882 if (!IS_ERR(mmc->supply.vmmc)) { 883 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 884 /* 885 * Attention: empiric value. With a b43 WiFi SDIO card this 886 * delay proved necessary for reliable card-insertion probing. 887 * 100us were not enough. Is this the same 140us delay, as in 888 * tmio_mmc_set_ios()? 889 */ 890 usleep_range(200, 300); 891 } 892 /* 893 * It seems, VccQ should be switched on after Vcc, this is also what the 894 * omap_hsmmc.c driver does. 895 */ 896 if (!IS_ERR(mmc->supply.vqmmc) && !ret) { 897 ret = regulator_enable(mmc->supply.vqmmc); 898 usleep_range(200, 300); 899 } 900 901 if (ret < 0) 902 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n", 903 ret); 904 } 905 906 static void tmio_mmc_power_off(struct tmio_mmc_host *host) 907 { 908 struct mmc_host *mmc = host->mmc; 909 910 if (!IS_ERR(mmc->supply.vqmmc)) 911 regulator_disable(mmc->supply.vqmmc); 912 913 if (!IS_ERR(mmc->supply.vmmc)) 914 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 915 916 if (host->set_pwr) 917 host->set_pwr(host->pdev, 0); 918 } 919 920 static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host) 921 { 922 u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); 923 924 val = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT; 925 return 1 << (13 + val); 926 } 927 928 static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host) 929 { 930 unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max; 931 932 host->mmc->max_busy_timeout = host->get_timeout_cycles(host) / 933 (clk_rate / MSEC_PER_SEC); 934 } 935 936 /* Set MMC clock / power. 937 * Note: This controller uses a simple divider scheme therefore it cannot 938 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as 939 * MMC wont run that fast, it has to be clocked at 12MHz which is the next 940 * slowest setting. 941 */ 942 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 943 { 944 struct tmio_mmc_host *host = mmc_priv(mmc); 945 struct device *dev = &host->pdev->dev; 946 unsigned long flags; 947 948 mutex_lock(&host->ios_lock); 949 950 spin_lock_irqsave(&host->lock, flags); 951 if (host->mrq) { 952 if (IS_ERR(host->mrq)) { 953 dev_dbg(dev, 954 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n", 955 current->comm, task_pid_nr(current), 956 ios->clock, ios->power_mode); 957 host->mrq = ERR_PTR(-EINTR); 958 } else { 959 dev_dbg(dev, 960 "%s.%d: CMD%u active since %lu, now %lu!\n", 961 current->comm, task_pid_nr(current), 962 host->mrq->cmd->opcode, host->last_req_ts, 963 jiffies); 964 } 965 spin_unlock_irqrestore(&host->lock, flags); 966 967 mutex_unlock(&host->ios_lock); 968 return; 969 } 970 971 host->mrq = ERR_PTR(-EBUSY); 972 973 spin_unlock_irqrestore(&host->lock, flags); 974 975 switch (ios->power_mode) { 976 case MMC_POWER_OFF: 977 tmio_mmc_power_off(host); 978 /* For R-Car Gen2+, we need to reset SDHI specific SCC */ 979 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 980 tmio_mmc_reset(host, false); 981 982 host->set_clock(host, 0); 983 break; 984 case MMC_POWER_UP: 985 tmio_mmc_power_on(host, ios->vdd); 986 host->set_clock(host, ios->clock); 987 tmio_mmc_set_bus_width(host, ios->bus_width); 988 break; 989 case MMC_POWER_ON: 990 host->set_clock(host, ios->clock); 991 tmio_mmc_set_bus_width(host, ios->bus_width); 992 break; 993 } 994 995 if (host->pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT) 996 tmio_mmc_max_busy_timeout(host); 997 998 /* Let things settle. delay taken from winCE driver */ 999 usleep_range(140, 200); 1000 if (PTR_ERR(host->mrq) == -EINTR) 1001 dev_dbg(&host->pdev->dev, 1002 "%s.%d: IOS interrupted: clk %u, mode %u", 1003 current->comm, task_pid_nr(current), 1004 ios->clock, ios->power_mode); 1005 host->mrq = NULL; 1006 1007 host->clk_cache = ios->clock; 1008 1009 mutex_unlock(&host->ios_lock); 1010 } 1011 1012 static int tmio_mmc_get_ro(struct mmc_host *mmc) 1013 { 1014 struct tmio_mmc_host *host = mmc_priv(mmc); 1015 1016 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 1017 TMIO_STAT_WRPROTECT); 1018 } 1019 1020 static int tmio_mmc_get_cd(struct mmc_host *mmc) 1021 { 1022 struct tmio_mmc_host *host = mmc_priv(mmc); 1023 1024 return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 1025 TMIO_STAT_SIGSTATE); 1026 } 1027 1028 static int tmio_multi_io_quirk(struct mmc_card *card, 1029 unsigned int direction, int blk_size) 1030 { 1031 struct tmio_mmc_host *host = mmc_priv(card->host); 1032 1033 if (host->multi_io_quirk) 1034 return host->multi_io_quirk(card, direction, blk_size); 1035 1036 return blk_size; 1037 } 1038 1039 static struct mmc_host_ops tmio_mmc_ops = { 1040 .request = tmio_mmc_request, 1041 .set_ios = tmio_mmc_set_ios, 1042 .get_ro = tmio_mmc_get_ro, 1043 .get_cd = tmio_mmc_get_cd, 1044 .enable_sdio_irq = tmio_mmc_enable_sdio_irq, 1045 .multi_io_quirk = tmio_multi_io_quirk, 1046 }; 1047 1048 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host) 1049 { 1050 struct tmio_mmc_data *pdata = host->pdata; 1051 struct mmc_host *mmc = host->mmc; 1052 int err; 1053 1054 err = mmc_regulator_get_supply(mmc); 1055 if (err) 1056 return err; 1057 1058 /* use ocr_mask if no regulator */ 1059 if (!mmc->ocr_avail) 1060 mmc->ocr_avail = pdata->ocr_mask; 1061 1062 /* 1063 * try again. 1064 * There is possibility that regulator has not been probed 1065 */ 1066 if (!mmc->ocr_avail) 1067 return -EPROBE_DEFER; 1068 1069 return 0; 1070 } 1071 1072 static void tmio_mmc_of_parse(struct platform_device *pdev, 1073 struct mmc_host *mmc) 1074 { 1075 const struct device_node *np = pdev->dev.of_node; 1076 1077 if (!np) 1078 return; 1079 1080 /* 1081 * DEPRECATED: 1082 * For new platforms, please use "disable-wp" instead of 1083 * "toshiba,mmc-wrprotect-disable" 1084 */ 1085 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL)) 1086 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT; 1087 } 1088 1089 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev, 1090 struct tmio_mmc_data *pdata) 1091 { 1092 struct tmio_mmc_host *host; 1093 struct mmc_host *mmc; 1094 void __iomem *ctl; 1095 int ret; 1096 1097 ctl = devm_platform_ioremap_resource(pdev, 0); 1098 if (IS_ERR(ctl)) 1099 return ERR_CAST(ctl); 1100 1101 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev); 1102 if (!mmc) 1103 return ERR_PTR(-ENOMEM); 1104 1105 host = mmc_priv(mmc); 1106 host->ctl = ctl; 1107 host->mmc = mmc; 1108 host->pdev = pdev; 1109 host->pdata = pdata; 1110 host->ops = tmio_mmc_ops; 1111 mmc->ops = &host->ops; 1112 1113 ret = mmc_of_parse(host->mmc); 1114 if (ret) { 1115 host = ERR_PTR(ret); 1116 goto free; 1117 } 1118 1119 tmio_mmc_of_parse(pdev, mmc); 1120 1121 platform_set_drvdata(pdev, host); 1122 1123 return host; 1124 free: 1125 mmc_free_host(mmc); 1126 1127 return host; 1128 } 1129 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc); 1130 1131 void tmio_mmc_host_free(struct tmio_mmc_host *host) 1132 { 1133 mmc_free_host(host->mmc); 1134 } 1135 EXPORT_SYMBOL_GPL(tmio_mmc_host_free); 1136 1137 int tmio_mmc_host_probe(struct tmio_mmc_host *_host) 1138 { 1139 struct platform_device *pdev = _host->pdev; 1140 struct tmio_mmc_data *pdata = _host->pdata; 1141 struct mmc_host *mmc = _host->mmc; 1142 int ret; 1143 1144 /* 1145 * Check the sanity of mmc->f_min to prevent host->set_clock() from 1146 * looping forever... 1147 */ 1148 if (mmc->f_min == 0) 1149 return -EINVAL; 1150 1151 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT)) 1152 _host->write16_hook = NULL; 1153 1154 if (pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT && !_host->get_timeout_cycles) 1155 _host->get_timeout_cycles = tmio_mmc_get_timeout_cycles; 1156 1157 _host->set_pwr = pdata->set_pwr; 1158 1159 ret = tmio_mmc_init_ocr(_host); 1160 if (ret < 0) 1161 return ret; 1162 1163 /* 1164 * Look for a card detect GPIO, if it fails with anything 1165 * else than a probe deferral, just live without it. 1166 */ 1167 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0); 1168 if (ret == -EPROBE_DEFER) 1169 return ret; 1170 1171 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities; 1172 mmc->caps2 |= pdata->capabilities2; 1173 mmc->max_segs = pdata->max_segs ? : 32; 1174 mmc->max_blk_size = TMIO_MAX_BLK_SIZE; 1175 mmc->max_blk_count = pdata->max_blk_count ? : 1176 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs; 1177 mmc->max_req_size = min_t(size_t, 1178 mmc->max_blk_size * mmc->max_blk_count, 1179 dma_max_mapping_size(&pdev->dev)); 1180 mmc->max_seg_size = mmc->max_req_size; 1181 1182 if (mmc_can_gpio_ro(mmc)) 1183 _host->ops.get_ro = mmc_gpio_get_ro; 1184 1185 if (mmc_can_gpio_cd(mmc)) 1186 _host->ops.get_cd = mmc_gpio_get_cd; 1187 1188 /* must be set before tmio_mmc_reset() */ 1189 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) || 1190 mmc->caps & MMC_CAP_NEEDS_POLL || 1191 !mmc_card_is_removable(mmc)); 1192 1193 /* 1194 * While using internal tmio hardware logic for card detection, we need 1195 * to ensure it stays powered for it to work. 1196 */ 1197 if (_host->native_hotplug) 1198 pm_runtime_get_noresume(&pdev->dev); 1199 1200 _host->sdio_irq_enabled = false; 1201 if (pdata->flags & TMIO_MMC_SDIO_IRQ) 1202 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 1203 1204 if (!_host->sdcard_irq_mask_all) 1205 _host->sdcard_irq_mask_all = TMIO_MASK_ALL; 1206 1207 _host->set_clock(_host, 0); 1208 tmio_mmc_reset(_host, false); 1209 1210 spin_lock_init(&_host->lock); 1211 mutex_init(&_host->ios_lock); 1212 1213 /* Init delayed work for request timeouts */ 1214 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work); 1215 INIT_WORK(&_host->done, tmio_mmc_done_work); 1216 1217 /* See if we also get DMA */ 1218 tmio_mmc_request_dma(_host, pdata); 1219 1220 pm_runtime_get_noresume(&pdev->dev); 1221 pm_runtime_set_active(&pdev->dev); 1222 pm_runtime_set_autosuspend_delay(&pdev->dev, 50); 1223 pm_runtime_use_autosuspend(&pdev->dev); 1224 pm_runtime_enable(&pdev->dev); 1225 1226 ret = mmc_add_host(mmc); 1227 if (ret) 1228 goto remove_host; 1229 1230 dev_pm_qos_expose_latency_limit(&pdev->dev, 100); 1231 pm_runtime_put(&pdev->dev); 1232 1233 return 0; 1234 1235 remove_host: 1236 pm_runtime_put_noidle(&pdev->dev); 1237 tmio_mmc_host_remove(_host); 1238 return ret; 1239 } 1240 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe); 1241 1242 void tmio_mmc_host_remove(struct tmio_mmc_host *host) 1243 { 1244 struct platform_device *pdev = host->pdev; 1245 struct mmc_host *mmc = host->mmc; 1246 1247 pm_runtime_get_sync(&pdev->dev); 1248 1249 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) 1250 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); 1251 1252 dev_pm_qos_hide_latency_limit(&pdev->dev); 1253 1254 mmc_remove_host(mmc); 1255 cancel_work_sync(&host->done); 1256 cancel_delayed_work_sync(&host->delayed_reset_work); 1257 tmio_mmc_release_dma(host); 1258 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all); 1259 1260 if (host->native_hotplug) 1261 pm_runtime_put_noidle(&pdev->dev); 1262 1263 pm_runtime_disable(&pdev->dev); 1264 pm_runtime_dont_use_autosuspend(&pdev->dev); 1265 pm_runtime_put_noidle(&pdev->dev); 1266 } 1267 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove); 1268 1269 #ifdef CONFIG_PM 1270 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host) 1271 { 1272 if (!host->clk_enable) 1273 return -ENOTSUPP; 1274 1275 return host->clk_enable(host); 1276 } 1277 1278 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host) 1279 { 1280 if (host->clk_disable) 1281 host->clk_disable(host); 1282 } 1283 1284 int tmio_mmc_host_runtime_suspend(struct device *dev) 1285 { 1286 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1287 1288 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all); 1289 1290 if (host->clk_cache) 1291 host->set_clock(host, 0); 1292 1293 tmio_mmc_clk_disable(host); 1294 1295 return 0; 1296 } 1297 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend); 1298 1299 int tmio_mmc_host_runtime_resume(struct device *dev) 1300 { 1301 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1302 1303 tmio_mmc_clk_enable(host); 1304 tmio_mmc_reset(host, false); 1305 1306 if (host->clk_cache) 1307 host->set_clock(host, host->clk_cache); 1308 1309 tmio_mmc_enable_dma(host, true); 1310 1311 return 0; 1312 } 1313 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume); 1314 #endif 1315 1316 MODULE_LICENSE("GPL v2"); 1317