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; 415 416 if (host->dma_on) { 417 pr_err("PIO IRQ in DMA mode!\n"); 418 return; 419 } else if (!data) { 420 pr_debug("Spurious PIO IRQ\n"); 421 return; 422 } 423 424 sg_virt = kmap_local_page(sg_page(host->sg_ptr)); 425 buf = (unsigned short *)(sg_virt + host->sg_ptr->offset + host->sg_off); 426 427 count = host->sg_ptr->length - host->sg_off; 428 if (count > data->blksz) 429 count = data->blksz; 430 431 pr_debug("count: %08x offset: %08x flags %08x\n", 432 count, host->sg_off, data->flags); 433 434 /* Transfer the data */ 435 tmio_mmc_transfer_data(host, buf, count); 436 437 host->sg_off += count; 438 439 kunmap_local(sg_virt); 440 441 if (host->sg_off == host->sg_ptr->length) 442 tmio_mmc_next_sg(host); 443 } 444 445 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) 446 { 447 if (host->sg_ptr == &host->bounce_sg) { 448 void *sg_virt = kmap_local_page(sg_page(host->sg_orig)); 449 450 memcpy(sg_virt + host->sg_orig->offset, host->bounce_buf, 451 host->bounce_sg.length); 452 kunmap_local(sg_virt); 453 } 454 } 455 456 /* needs to be called with host->lock held */ 457 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) 458 { 459 struct mmc_data *data = host->data; 460 struct mmc_command *stop; 461 462 host->data = NULL; 463 464 if (!data) { 465 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n"); 466 return; 467 } 468 stop = data->stop; 469 470 /* FIXME - return correct transfer count on errors */ 471 if (!data->error) 472 data->bytes_xfered = data->blocks * data->blksz; 473 else 474 data->bytes_xfered = 0; 475 476 pr_debug("Completed data request\n"); 477 478 /* 479 * FIXME: other drivers allow an optional stop command of any given type 480 * which we dont do, as the chip can auto generate them. 481 * Perhaps we can be smarter about when to use auto CMD12 and 482 * only issue the auto request when we know this is the desired 483 * stop command, allowing fallback to the stop command the 484 * upper layers expect. For now, we do what works. 485 */ 486 487 if (data->flags & MMC_DATA_READ) { 488 if (host->dma_on) 489 tmio_mmc_check_bounce_buffer(host); 490 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n", 491 host->mrq); 492 } else { 493 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n", 494 host->mrq); 495 } 496 497 if (stop && !host->mrq->sbc) { 498 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg) 499 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n", 500 stop->opcode, stop->arg); 501 502 /* fill in response from auto CMD12 */ 503 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE); 504 505 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0); 506 } 507 508 schedule_work(&host->done); 509 } 510 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq); 511 512 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat) 513 { 514 struct mmc_data *data; 515 516 spin_lock(&host->lock); 517 data = host->data; 518 519 if (!data) 520 goto out; 521 522 if (stat & TMIO_STAT_DATATIMEOUT) 523 data->error = -ETIMEDOUT; 524 else if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR || 525 stat & TMIO_STAT_TXUNDERRUN) 526 data->error = -EILSEQ; 527 if (host->dma_on && (data->flags & MMC_DATA_WRITE)) { 528 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 529 bool done = false; 530 531 /* 532 * Has all data been written out yet? Testing on SuperH showed, 533 * that in most cases the first interrupt comes already with the 534 * BUSY status bit clear, but on some operations, like mount or 535 * in the beginning of a write / sync / umount, there is one 536 * DATAEND interrupt with the BUSY bit set, in this cases 537 * waiting for one more interrupt fixes the problem. 538 */ 539 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) { 540 if (status & TMIO_STAT_SCLKDIVEN) 541 done = true; 542 } else { 543 if (!(status & TMIO_STAT_CMD_BUSY)) 544 done = true; 545 } 546 547 if (done) { 548 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 549 tmio_mmc_dataend_dma(host); 550 } 551 } else if (host->dma_on && (data->flags & MMC_DATA_READ)) { 552 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 553 tmio_mmc_dataend_dma(host); 554 } else { 555 tmio_mmc_do_data_irq(host); 556 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP); 557 } 558 out: 559 spin_unlock(&host->lock); 560 } 561 562 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat) 563 { 564 struct mmc_command *cmd = host->cmd; 565 int i, addr; 566 567 spin_lock(&host->lock); 568 569 if (!host->cmd) { 570 pr_debug("Spurious CMD irq\n"); 571 goto out; 572 } 573 574 /* This controller is sicker than the PXA one. Not only do we need to 575 * drop the top 8 bits of the first response word, we also need to 576 * modify the order of the response for short response command types. 577 */ 578 579 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4) 580 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr); 581 582 if (cmd->flags & MMC_RSP_136) { 583 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24); 584 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24); 585 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24); 586 cmd->resp[3] <<= 8; 587 } else if (cmd->flags & MMC_RSP_R3) { 588 cmd->resp[0] = cmd->resp[3]; 589 } 590 591 if (stat & TMIO_STAT_CMDTIMEOUT) 592 cmd->error = -ETIMEDOUT; 593 else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) || 594 stat & TMIO_STAT_STOPBIT_ERR || 595 stat & TMIO_STAT_CMD_IDX_ERR) 596 cmd->error = -EILSEQ; 597 598 /* If there is data to handle we enable data IRQs here, and 599 * we will ultimatley finish the request in the data_end handler. 600 * If theres no data or we encountered an error, finish now. 601 */ 602 if (host->data && (!cmd->error || cmd->error == -EILSEQ)) { 603 if (host->data->flags & MMC_DATA_READ) { 604 if (!host->dma_on) { 605 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP); 606 } else { 607 tmio_mmc_disable_mmc_irqs(host, 608 TMIO_MASK_READOP); 609 tasklet_schedule(&host->dma_issue); 610 } 611 } else { 612 if (!host->dma_on) { 613 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP); 614 } else { 615 tmio_mmc_disable_mmc_irqs(host, 616 TMIO_MASK_WRITEOP); 617 tasklet_schedule(&host->dma_issue); 618 } 619 } 620 } else { 621 schedule_work(&host->done); 622 } 623 624 out: 625 spin_unlock(&host->lock); 626 } 627 628 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host, 629 int ireg, int status) 630 { 631 struct mmc_host *mmc = host->mmc; 632 633 /* Card insert / remove attempts */ 634 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) { 635 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT | 636 TMIO_STAT_CARD_REMOVE); 637 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) || 638 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) && 639 !work_pending(&mmc->detect.work)) 640 mmc_detect_change(host->mmc, msecs_to_jiffies(100)); 641 return true; 642 } 643 644 return false; 645 } 646 647 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg, 648 int status) 649 { 650 /* Command completion */ 651 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) { 652 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND | 653 TMIO_STAT_CMDTIMEOUT); 654 tmio_mmc_cmd_irq(host, status); 655 return true; 656 } 657 658 /* Data transfer */ 659 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) { 660 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ); 661 tmio_mmc_pio_irq(host); 662 return true; 663 } 664 665 /* Data transfer completion */ 666 if (ireg & TMIO_STAT_DATAEND) { 667 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND); 668 tmio_mmc_data_irq(host, status); 669 return true; 670 } 671 672 if (host->dma_ops && host->dma_ops->dma_irq && host->dma_ops->dma_irq(host)) 673 return true; 674 675 return false; 676 } 677 678 static bool __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) 679 { 680 struct mmc_host *mmc = host->mmc; 681 struct tmio_mmc_data *pdata = host->pdata; 682 unsigned int ireg, status; 683 unsigned int sdio_status; 684 685 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ)) 686 return false; 687 688 status = sd_ctrl_read16(host, CTL_SDIO_STATUS); 689 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask; 690 691 sdio_status = status & ~TMIO_SDIO_MASK_ALL; 692 if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS) 693 sdio_status |= TMIO_SDIO_SETBITS_MASK; 694 695 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status); 696 697 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ) 698 mmc_signal_sdio_irq(mmc); 699 700 return ireg; 701 } 702 703 irqreturn_t tmio_mmc_irq(int irq, void *devid) 704 { 705 struct tmio_mmc_host *host = devid; 706 unsigned int ireg, status; 707 708 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 709 ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask; 710 711 /* Clear the status except the interrupt status */ 712 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ); 713 714 if (__tmio_mmc_card_detect_irq(host, ireg, status)) 715 return IRQ_HANDLED; 716 if (__tmio_mmc_sdcard_irq(host, ireg, status)) 717 return IRQ_HANDLED; 718 719 if (__tmio_mmc_sdio_irq(host)) 720 return IRQ_HANDLED; 721 722 return IRQ_NONE; 723 } 724 EXPORT_SYMBOL_GPL(tmio_mmc_irq); 725 726 static int tmio_mmc_start_data(struct tmio_mmc_host *host, 727 struct mmc_data *data) 728 { 729 struct tmio_mmc_data *pdata = host->pdata; 730 731 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n", 732 data->blksz, data->blocks); 733 734 /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */ 735 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 || 736 host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) { 737 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES; 738 739 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) { 740 pr_err("%s: %d byte block unsupported in 4/8 bit mode\n", 741 mmc_hostname(host->mmc), data->blksz); 742 return -EINVAL; 743 } 744 } 745 746 tmio_mmc_init_sg(host, data); 747 host->data = data; 748 host->dma_on = false; 749 750 /* Set transfer length / blocksize */ 751 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz); 752 if (host->mmc->max_blk_count >= SZ_64K) 753 sd_ctrl_write32(host, CTL_XFER_BLK_COUNT, data->blocks); 754 else 755 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks); 756 757 tmio_mmc_start_dma(host, data); 758 759 return 0; 760 } 761 762 static void tmio_process_mrq(struct tmio_mmc_host *host, 763 struct mmc_request *mrq) 764 { 765 struct mmc_command *cmd; 766 int ret; 767 768 if (mrq->sbc && host->cmd != mrq->sbc) { 769 cmd = mrq->sbc; 770 } else { 771 cmd = mrq->cmd; 772 if (mrq->data) { 773 ret = tmio_mmc_start_data(host, mrq->data); 774 if (ret) 775 goto fail; 776 } 777 } 778 779 ret = tmio_mmc_start_command(host, cmd); 780 if (ret) 781 goto fail; 782 783 schedule_delayed_work(&host->delayed_reset_work, 784 msecs_to_jiffies(CMDREQ_TIMEOUT)); 785 return; 786 787 fail: 788 host->mrq = NULL; 789 mrq->cmd->error = ret; 790 mmc_request_done(host->mmc, mrq); 791 } 792 793 /* Process requests from the MMC layer */ 794 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 795 { 796 struct tmio_mmc_host *host = mmc_priv(mmc); 797 unsigned long flags; 798 799 spin_lock_irqsave(&host->lock, flags); 800 801 if (host->mrq) { 802 pr_debug("request not null\n"); 803 if (IS_ERR(host->mrq)) { 804 spin_unlock_irqrestore(&host->lock, flags); 805 mrq->cmd->error = -EAGAIN; 806 mmc_request_done(mmc, mrq); 807 return; 808 } 809 } 810 811 host->last_req_ts = jiffies; 812 wmb(); 813 host->mrq = mrq; 814 815 spin_unlock_irqrestore(&host->lock, flags); 816 817 tmio_process_mrq(host, mrq); 818 } 819 820 static void tmio_mmc_finish_request(struct tmio_mmc_host *host) 821 { 822 struct mmc_request *mrq; 823 unsigned long flags; 824 825 spin_lock_irqsave(&host->lock, flags); 826 827 tmio_mmc_end_dma(host); 828 829 mrq = host->mrq; 830 if (IS_ERR_OR_NULL(mrq)) { 831 spin_unlock_irqrestore(&host->lock, flags); 832 return; 833 } 834 835 /* If not SET_BLOCK_COUNT, clear old data */ 836 if (host->cmd != mrq->sbc) { 837 host->cmd = NULL; 838 host->data = NULL; 839 host->mrq = NULL; 840 } 841 842 cancel_delayed_work(&host->delayed_reset_work); 843 844 spin_unlock_irqrestore(&host->lock, flags); 845 846 if (mrq->cmd->error || (mrq->data && mrq->data->error)) { 847 tmio_mmc_ack_mmc_irqs(host, TMIO_MASK_IRQ); /* Clear all */ 848 tmio_mmc_abort_dma(host); 849 } 850 851 /* Error means retune, but executed command was still successful */ 852 if (host->check_retune && host->check_retune(host, mrq)) 853 mmc_retune_needed(host->mmc); 854 855 /* If SET_BLOCK_COUNT, continue with main command */ 856 if (host->mrq && !mrq->cmd->error) { 857 tmio_process_mrq(host, mrq); 858 return; 859 } 860 861 if (host->fixup_request) 862 host->fixup_request(host, mrq); 863 864 mmc_request_done(host->mmc, mrq); 865 } 866 867 static void tmio_mmc_done_work(struct work_struct *work) 868 { 869 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 870 done); 871 tmio_mmc_finish_request(host); 872 } 873 874 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd) 875 { 876 struct mmc_host *mmc = host->mmc; 877 int ret = 0; 878 879 /* .set_ios() is returning void, so, no chance to report an error */ 880 881 if (host->set_pwr) 882 host->set_pwr(host->pdev, 1); 883 884 if (!IS_ERR(mmc->supply.vmmc)) { 885 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 886 /* 887 * Attention: empiric value. With a b43 WiFi SDIO card this 888 * delay proved necessary for reliable card-insertion probing. 889 * 100us were not enough. Is this the same 140us delay, as in 890 * tmio_mmc_set_ios()? 891 */ 892 usleep_range(200, 300); 893 } 894 /* 895 * It seems, VccQ should be switched on after Vcc, this is also what the 896 * omap_hsmmc.c driver does. 897 */ 898 if (!IS_ERR(mmc->supply.vqmmc) && !ret) { 899 ret = regulator_enable(mmc->supply.vqmmc); 900 usleep_range(200, 300); 901 } 902 903 if (ret < 0) 904 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n", 905 ret); 906 } 907 908 static void tmio_mmc_power_off(struct tmio_mmc_host *host) 909 { 910 struct mmc_host *mmc = host->mmc; 911 912 if (!IS_ERR(mmc->supply.vqmmc)) 913 regulator_disable(mmc->supply.vqmmc); 914 915 if (!IS_ERR(mmc->supply.vmmc)) 916 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 917 918 if (host->set_pwr) 919 host->set_pwr(host->pdev, 0); 920 } 921 922 static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host) 923 { 924 u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT); 925 926 val = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT; 927 return 1 << (13 + val); 928 } 929 930 static void tmio_mmc_max_busy_timeout(struct tmio_mmc_host *host) 931 { 932 unsigned int clk_rate = host->mmc->actual_clock ?: host->mmc->f_max; 933 934 host->mmc->max_busy_timeout = host->get_timeout_cycles(host) / 935 (clk_rate / MSEC_PER_SEC); 936 } 937 938 /* Set MMC clock / power. 939 * Note: This controller uses a simple divider scheme therefore it cannot 940 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as 941 * MMC wont run that fast, it has to be clocked at 12MHz which is the next 942 * slowest setting. 943 */ 944 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 945 { 946 struct tmio_mmc_host *host = mmc_priv(mmc); 947 struct device *dev = &host->pdev->dev; 948 unsigned long flags; 949 950 mutex_lock(&host->ios_lock); 951 952 spin_lock_irqsave(&host->lock, flags); 953 if (host->mrq) { 954 if (IS_ERR(host->mrq)) { 955 dev_dbg(dev, 956 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n", 957 current->comm, task_pid_nr(current), 958 ios->clock, ios->power_mode); 959 host->mrq = ERR_PTR(-EINTR); 960 } else { 961 dev_dbg(dev, 962 "%s.%d: CMD%u active since %lu, now %lu!\n", 963 current->comm, task_pid_nr(current), 964 host->mrq->cmd->opcode, host->last_req_ts, 965 jiffies); 966 } 967 spin_unlock_irqrestore(&host->lock, flags); 968 969 mutex_unlock(&host->ios_lock); 970 return; 971 } 972 973 host->mrq = ERR_PTR(-EBUSY); 974 975 spin_unlock_irqrestore(&host->lock, flags); 976 977 switch (ios->power_mode) { 978 case MMC_POWER_OFF: 979 tmio_mmc_power_off(host); 980 /* For R-Car Gen2+, we need to reset SDHI specific SCC */ 981 if (host->pdata->flags & TMIO_MMC_MIN_RCAR2) 982 tmio_mmc_reset(host, false); 983 984 host->set_clock(host, 0); 985 break; 986 case MMC_POWER_UP: 987 tmio_mmc_power_on(host, ios->vdd); 988 host->set_clock(host, ios->clock); 989 tmio_mmc_set_bus_width(host, ios->bus_width); 990 break; 991 case MMC_POWER_ON: 992 host->set_clock(host, ios->clock); 993 tmio_mmc_set_bus_width(host, ios->bus_width); 994 break; 995 } 996 997 if (host->pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT) 998 tmio_mmc_max_busy_timeout(host); 999 1000 /* Let things settle. delay taken from winCE driver */ 1001 usleep_range(140, 200); 1002 if (PTR_ERR(host->mrq) == -EINTR) 1003 dev_dbg(&host->pdev->dev, 1004 "%s.%d: IOS interrupted: clk %u, mode %u", 1005 current->comm, task_pid_nr(current), 1006 ios->clock, ios->power_mode); 1007 host->mrq = NULL; 1008 1009 host->clk_cache = ios->clock; 1010 1011 mutex_unlock(&host->ios_lock); 1012 } 1013 1014 static int tmio_mmc_get_ro(struct mmc_host *mmc) 1015 { 1016 struct tmio_mmc_host *host = mmc_priv(mmc); 1017 1018 return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 1019 TMIO_STAT_WRPROTECT); 1020 } 1021 1022 static int tmio_mmc_get_cd(struct mmc_host *mmc) 1023 { 1024 struct tmio_mmc_host *host = mmc_priv(mmc); 1025 1026 return !!(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & 1027 TMIO_STAT_SIGSTATE); 1028 } 1029 1030 static int tmio_multi_io_quirk(struct mmc_card *card, 1031 unsigned int direction, int blk_size) 1032 { 1033 struct tmio_mmc_host *host = mmc_priv(card->host); 1034 1035 if (host->multi_io_quirk) 1036 return host->multi_io_quirk(card, direction, blk_size); 1037 1038 return blk_size; 1039 } 1040 1041 static struct mmc_host_ops tmio_mmc_ops = { 1042 .request = tmio_mmc_request, 1043 .set_ios = tmio_mmc_set_ios, 1044 .get_ro = tmio_mmc_get_ro, 1045 .get_cd = tmio_mmc_get_cd, 1046 .enable_sdio_irq = tmio_mmc_enable_sdio_irq, 1047 .multi_io_quirk = tmio_multi_io_quirk, 1048 }; 1049 1050 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host) 1051 { 1052 struct tmio_mmc_data *pdata = host->pdata; 1053 struct mmc_host *mmc = host->mmc; 1054 int err; 1055 1056 err = mmc_regulator_get_supply(mmc); 1057 if (err) 1058 return err; 1059 1060 /* use ocr_mask if no regulator */ 1061 if (!mmc->ocr_avail) 1062 mmc->ocr_avail = pdata->ocr_mask; 1063 1064 /* 1065 * try again. 1066 * There is possibility that regulator has not been probed 1067 */ 1068 if (!mmc->ocr_avail) 1069 return -EPROBE_DEFER; 1070 1071 return 0; 1072 } 1073 1074 static void tmio_mmc_of_parse(struct platform_device *pdev, 1075 struct mmc_host *mmc) 1076 { 1077 const struct device_node *np = pdev->dev.of_node; 1078 1079 if (!np) 1080 return; 1081 1082 /* 1083 * DEPRECATED: 1084 * For new platforms, please use "disable-wp" instead of 1085 * "toshiba,mmc-wrprotect-disable" 1086 */ 1087 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL)) 1088 mmc->caps2 |= MMC_CAP2_NO_WRITE_PROTECT; 1089 } 1090 1091 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev, 1092 struct tmio_mmc_data *pdata) 1093 { 1094 struct tmio_mmc_host *host; 1095 struct mmc_host *mmc; 1096 void __iomem *ctl; 1097 int ret; 1098 1099 ctl = devm_platform_ioremap_resource(pdev, 0); 1100 if (IS_ERR(ctl)) 1101 return ERR_CAST(ctl); 1102 1103 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev); 1104 if (!mmc) 1105 return ERR_PTR(-ENOMEM); 1106 1107 host = mmc_priv(mmc); 1108 host->ctl = ctl; 1109 host->mmc = mmc; 1110 host->pdev = pdev; 1111 host->pdata = pdata; 1112 host->ops = tmio_mmc_ops; 1113 mmc->ops = &host->ops; 1114 1115 ret = mmc_of_parse(host->mmc); 1116 if (ret) { 1117 host = ERR_PTR(ret); 1118 goto free; 1119 } 1120 1121 tmio_mmc_of_parse(pdev, mmc); 1122 1123 platform_set_drvdata(pdev, host); 1124 1125 return host; 1126 free: 1127 mmc_free_host(mmc); 1128 1129 return host; 1130 } 1131 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc); 1132 1133 void tmio_mmc_host_free(struct tmio_mmc_host *host) 1134 { 1135 mmc_free_host(host->mmc); 1136 } 1137 EXPORT_SYMBOL_GPL(tmio_mmc_host_free); 1138 1139 int tmio_mmc_host_probe(struct tmio_mmc_host *_host) 1140 { 1141 struct platform_device *pdev = _host->pdev; 1142 struct tmio_mmc_data *pdata = _host->pdata; 1143 struct mmc_host *mmc = _host->mmc; 1144 int ret; 1145 1146 /* 1147 * Check the sanity of mmc->f_min to prevent host->set_clock() from 1148 * looping forever... 1149 */ 1150 if (mmc->f_min == 0) 1151 return -EINVAL; 1152 1153 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT)) 1154 _host->write16_hook = NULL; 1155 1156 if (pdata->flags & TMIO_MMC_USE_BUSY_TIMEOUT && !_host->get_timeout_cycles) 1157 _host->get_timeout_cycles = tmio_mmc_get_timeout_cycles; 1158 1159 _host->set_pwr = pdata->set_pwr; 1160 1161 ret = tmio_mmc_init_ocr(_host); 1162 if (ret < 0) 1163 return ret; 1164 1165 /* 1166 * Look for a card detect GPIO, if it fails with anything 1167 * else than a probe deferral, just live without it. 1168 */ 1169 ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0); 1170 if (ret == -EPROBE_DEFER) 1171 return ret; 1172 1173 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities; 1174 mmc->caps2 |= pdata->capabilities2; 1175 mmc->max_segs = pdata->max_segs ? : 32; 1176 mmc->max_blk_size = TMIO_MAX_BLK_SIZE; 1177 mmc->max_blk_count = pdata->max_blk_count ? : 1178 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs; 1179 mmc->max_req_size = min_t(size_t, 1180 mmc->max_blk_size * mmc->max_blk_count, 1181 dma_max_mapping_size(&pdev->dev)); 1182 mmc->max_seg_size = mmc->max_req_size; 1183 1184 if (mmc_can_gpio_ro(mmc)) 1185 _host->ops.get_ro = mmc_gpio_get_ro; 1186 1187 if (mmc_can_gpio_cd(mmc)) 1188 _host->ops.get_cd = mmc_gpio_get_cd; 1189 1190 /* must be set before tmio_mmc_reset() */ 1191 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) || 1192 mmc->caps & MMC_CAP_NEEDS_POLL || 1193 !mmc_card_is_removable(mmc)); 1194 1195 /* 1196 * While using internal tmio hardware logic for card detection, we need 1197 * to ensure it stays powered for it to work. 1198 */ 1199 if (_host->native_hotplug) 1200 pm_runtime_get_noresume(&pdev->dev); 1201 1202 _host->sdio_irq_enabled = false; 1203 if (pdata->flags & TMIO_MMC_SDIO_IRQ) 1204 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 1205 1206 if (!_host->sdcard_irq_mask_all) 1207 _host->sdcard_irq_mask_all = TMIO_MASK_ALL; 1208 1209 _host->set_clock(_host, 0); 1210 tmio_mmc_reset(_host, false); 1211 1212 spin_lock_init(&_host->lock); 1213 mutex_init(&_host->ios_lock); 1214 1215 /* Init delayed work for request timeouts */ 1216 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work); 1217 INIT_WORK(&_host->done, tmio_mmc_done_work); 1218 1219 /* See if we also get DMA */ 1220 tmio_mmc_request_dma(_host, pdata); 1221 1222 pm_runtime_get_noresume(&pdev->dev); 1223 pm_runtime_set_active(&pdev->dev); 1224 pm_runtime_set_autosuspend_delay(&pdev->dev, 50); 1225 pm_runtime_use_autosuspend(&pdev->dev); 1226 pm_runtime_enable(&pdev->dev); 1227 1228 ret = mmc_add_host(mmc); 1229 if (ret) 1230 goto remove_host; 1231 1232 dev_pm_qos_expose_latency_limit(&pdev->dev, 100); 1233 pm_runtime_put(&pdev->dev); 1234 1235 return 0; 1236 1237 remove_host: 1238 pm_runtime_put_noidle(&pdev->dev); 1239 tmio_mmc_host_remove(_host); 1240 return ret; 1241 } 1242 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe); 1243 1244 void tmio_mmc_host_remove(struct tmio_mmc_host *host) 1245 { 1246 struct platform_device *pdev = host->pdev; 1247 struct mmc_host *mmc = host->mmc; 1248 1249 pm_runtime_get_sync(&pdev->dev); 1250 1251 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) 1252 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); 1253 1254 dev_pm_qos_hide_latency_limit(&pdev->dev); 1255 1256 mmc_remove_host(mmc); 1257 cancel_work_sync(&host->done); 1258 cancel_delayed_work_sync(&host->delayed_reset_work); 1259 tmio_mmc_release_dma(host); 1260 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all); 1261 1262 if (host->native_hotplug) 1263 pm_runtime_put_noidle(&pdev->dev); 1264 1265 pm_runtime_disable(&pdev->dev); 1266 pm_runtime_dont_use_autosuspend(&pdev->dev); 1267 pm_runtime_put_noidle(&pdev->dev); 1268 } 1269 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove); 1270 1271 #ifdef CONFIG_PM 1272 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host) 1273 { 1274 if (!host->clk_enable) 1275 return -ENOTSUPP; 1276 1277 return host->clk_enable(host); 1278 } 1279 1280 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host) 1281 { 1282 if (host->clk_disable) 1283 host->clk_disable(host); 1284 } 1285 1286 int tmio_mmc_host_runtime_suspend(struct device *dev) 1287 { 1288 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1289 1290 tmio_mmc_disable_mmc_irqs(host, host->sdcard_irq_mask_all); 1291 1292 if (host->clk_cache) 1293 host->set_clock(host, 0); 1294 1295 tmio_mmc_clk_disable(host); 1296 1297 return 0; 1298 } 1299 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend); 1300 1301 int tmio_mmc_host_runtime_resume(struct device *dev) 1302 { 1303 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1304 1305 tmio_mmc_clk_enable(host); 1306 tmio_mmc_reset(host, false); 1307 1308 if (host->clk_cache) 1309 host->set_clock(host, host->clk_cache); 1310 1311 tmio_mmc_enable_dma(host, true); 1312 1313 return 0; 1314 } 1315 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume); 1316 #endif 1317 1318 MODULE_LICENSE("GPL v2"); 1319