1 /* 2 * Driver for the MMC / SD / SDIO IP found in: 3 * 4 * TC6393XB, TC6391XB, TC6387XB, T7L66XB, ASIC3, SH-Mobile SoCs 5 * 6 * Copyright (C) 2015-17 Renesas Electronics Corporation 7 * Copyright (C) 2016-17 Sang Engineering, Wolfram Sang 8 * Copyright (C) 2017 Horms Solutions, Simon Horman 9 * Copyright (C) 2011 Guennadi Liakhovetski 10 * Copyright (C) 2007 Ian Molton 11 * Copyright (C) 2004 Ian Molton 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 * 17 * This driver draws mainly on scattered spec sheets, Reverse engineering 18 * of the toshiba e800 SD driver and some parts of the 2.4 ASIC3 driver (4 bit 19 * support). (Further 4 bit support from a later datasheet). 20 * 21 * TODO: 22 * Investigate using a workqueue for PIO transfers 23 * Eliminate FIXMEs 24 * Better Power management 25 * Handle MMC errors better 26 * double buffer support 27 * 28 */ 29 30 #include <linux/delay.h> 31 #include <linux/device.h> 32 #include <linux/highmem.h> 33 #include <linux/interrupt.h> 34 #include <linux/io.h> 35 #include <linux/irq.h> 36 #include <linux/mfd/tmio.h> 37 #include <linux/mmc/card.h> 38 #include <linux/mmc/host.h> 39 #include <linux/mmc/mmc.h> 40 #include <linux/mmc/slot-gpio.h> 41 #include <linux/module.h> 42 #include <linux/pagemap.h> 43 #include <linux/platform_device.h> 44 #include <linux/pm_qos.h> 45 #include <linux/pm_runtime.h> 46 #include <linux/regulator/consumer.h> 47 #include <linux/mmc/sdio.h> 48 #include <linux/scatterlist.h> 49 #include <linux/spinlock.h> 50 #include <linux/swiotlb.h> 51 #include <linux/workqueue.h> 52 53 #include "tmio_mmc.h" 54 55 static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host, 56 struct mmc_data *data) 57 { 58 if (host->dma_ops) 59 host->dma_ops->start(host, data); 60 } 61 62 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) 63 { 64 if (host->dma_ops) 65 host->dma_ops->enable(host, enable); 66 } 67 68 static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host, 69 struct tmio_mmc_data *pdata) 70 { 71 if (host->dma_ops) { 72 host->dma_ops->request(host, pdata); 73 } else { 74 host->chan_tx = NULL; 75 host->chan_rx = NULL; 76 } 77 } 78 79 static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host) 80 { 81 if (host->dma_ops) 82 host->dma_ops->release(host); 83 } 84 85 static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host) 86 { 87 if (host->dma_ops) 88 host->dma_ops->abort(host); 89 } 90 91 static inline void tmio_mmc_dataend_dma(struct tmio_mmc_host *host) 92 { 93 if (host->dma_ops) 94 host->dma_ops->dataend(host); 95 } 96 97 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i) 98 { 99 host->sdcard_irq_mask &= ~(i & TMIO_MASK_IRQ); 100 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask); 101 } 102 EXPORT_SYMBOL_GPL(tmio_mmc_enable_mmc_irqs); 103 104 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i) 105 { 106 host->sdcard_irq_mask |= (i & TMIO_MASK_IRQ); 107 sd_ctrl_write32_as_16_and_16(host, CTL_IRQ_MASK, host->sdcard_irq_mask); 108 } 109 EXPORT_SYMBOL_GPL(tmio_mmc_disable_mmc_irqs); 110 111 static void tmio_mmc_ack_mmc_irqs(struct tmio_mmc_host *host, u32 i) 112 { 113 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, ~i); 114 } 115 116 static void tmio_mmc_init_sg(struct tmio_mmc_host *host, struct mmc_data *data) 117 { 118 host->sg_len = data->sg_len; 119 host->sg_ptr = data->sg; 120 host->sg_orig = data->sg; 121 host->sg_off = 0; 122 } 123 124 static int tmio_mmc_next_sg(struct tmio_mmc_host *host) 125 { 126 host->sg_ptr = sg_next(host->sg_ptr); 127 host->sg_off = 0; 128 return --host->sg_len; 129 } 130 131 #define CMDREQ_TIMEOUT 5000 132 133 static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) 134 { 135 struct tmio_mmc_host *host = mmc_priv(mmc); 136 137 if (enable && !host->sdio_irq_enabled) { 138 u16 sdio_status; 139 140 /* Keep device active while SDIO irq is enabled */ 141 pm_runtime_get_sync(mmc_dev(mmc)); 142 143 host->sdio_irq_enabled = true; 144 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL & ~TMIO_SDIO_STAT_IOIRQ; 145 146 /* Clear obsolete interrupts before enabling */ 147 sdio_status = sd_ctrl_read16(host, CTL_SDIO_STATUS) & ~TMIO_SDIO_MASK_ALL; 148 if (host->pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS) 149 sdio_status |= TMIO_SDIO_SETBITS_MASK; 150 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status); 151 152 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 153 } else if (!enable && host->sdio_irq_enabled) { 154 host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 155 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 156 157 host->sdio_irq_enabled = false; 158 pm_runtime_mark_last_busy(mmc_dev(mmc)); 159 pm_runtime_put_autosuspend(mmc_dev(mmc)); 160 } 161 } 162 163 static void tmio_mmc_clk_start(struct tmio_mmc_host *host) 164 { 165 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN | 166 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 167 168 /* HW engineers overrode docs: no sleep needed on R-Car2+ */ 169 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 170 usleep_range(10000, 11000); 171 172 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) { 173 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100); 174 usleep_range(10000, 11000); 175 } 176 } 177 178 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host) 179 { 180 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) { 181 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000); 182 usleep_range(10000, 11000); 183 } 184 185 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 186 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 187 188 /* HW engineers overrode docs: no sleep needed on R-Car2+ */ 189 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 190 usleep_range(10000, 11000); 191 } 192 193 static void tmio_mmc_set_clock(struct tmio_mmc_host *host, 194 unsigned int new_clock) 195 { 196 u32 clk = 0, clock; 197 198 if (new_clock == 0) { 199 tmio_mmc_clk_stop(host); 200 return; 201 } 202 203 if (host->clk_update) 204 clock = host->clk_update(host, new_clock) / 512; 205 else 206 clock = host->mmc->f_min; 207 208 for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1) 209 clock <<= 1; 210 211 /* 1/1 clock is option */ 212 if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) 213 clk |= 0xff; 214 215 if (host->set_clk_div) 216 host->set_clk_div(host->pdev, (clk >> 22) & 1); 217 218 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN & 219 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL)); 220 sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK); 221 if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2)) 222 usleep_range(10000, 11000); 223 224 tmio_mmc_clk_start(host); 225 } 226 227 static void tmio_mmc_reset(struct tmio_mmc_host *host) 228 { 229 /* FIXME - should we set stop clock reg here */ 230 sd_ctrl_write16(host, CTL_RESET_SD, 0x0000); 231 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) 232 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000); 233 usleep_range(10000, 11000); 234 sd_ctrl_write16(host, CTL_RESET_SD, 0x0001); 235 if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) 236 sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001); 237 usleep_range(10000, 11000); 238 239 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) { 240 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask); 241 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001); 242 } 243 244 } 245 246 static void tmio_mmc_reset_work(struct work_struct *work) 247 { 248 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 249 delayed_reset_work.work); 250 struct mmc_request *mrq; 251 unsigned long flags; 252 253 spin_lock_irqsave(&host->lock, flags); 254 mrq = host->mrq; 255 256 /* 257 * is request already finished? Since we use a non-blocking 258 * cancel_delayed_work(), it can happen, that a .set_ios() call preempts 259 * us, so, have to check for IS_ERR(host->mrq) 260 */ 261 if (IS_ERR_OR_NULL(mrq) || 262 time_is_after_jiffies(host->last_req_ts + 263 msecs_to_jiffies(CMDREQ_TIMEOUT))) { 264 spin_unlock_irqrestore(&host->lock, flags); 265 return; 266 } 267 268 dev_warn(&host->pdev->dev, 269 "timeout waiting for hardware interrupt (CMD%u)\n", 270 mrq->cmd->opcode); 271 272 if (host->data) 273 host->data->error = -ETIMEDOUT; 274 else if (host->cmd) 275 host->cmd->error = -ETIMEDOUT; 276 else 277 mrq->cmd->error = -ETIMEDOUT; 278 279 host->cmd = NULL; 280 host->data = NULL; 281 host->force_pio = false; 282 283 spin_unlock_irqrestore(&host->lock, flags); 284 285 tmio_mmc_reset(host); 286 287 /* Ready for new calls */ 288 host->mrq = NULL; 289 290 tmio_mmc_abort_dma(host); 291 mmc_request_done(host->mmc, mrq); 292 } 293 294 /* These are the bitmasks the tmio chip requires to implement the MMC response 295 * types. Note that R1 and R6 are the same in this scheme. */ 296 #define APP_CMD 0x0040 297 #define RESP_NONE 0x0300 298 #define RESP_R1 0x0400 299 #define RESP_R1B 0x0500 300 #define RESP_R2 0x0600 301 #define RESP_R3 0x0700 302 #define DATA_PRESENT 0x0800 303 #define TRANSFER_READ 0x1000 304 #define TRANSFER_MULTI 0x2000 305 #define SECURITY_CMD 0x4000 306 #define NO_CMD12_ISSUE 0x4000 /* TMIO_MMC_HAVE_CMD12_CTRL */ 307 308 static int tmio_mmc_start_command(struct tmio_mmc_host *host, 309 struct mmc_command *cmd) 310 { 311 struct mmc_data *data = host->data; 312 int c = cmd->opcode; 313 u32 irq_mask = TMIO_MASK_CMD; 314 315 switch (mmc_resp_type(cmd)) { 316 case MMC_RSP_NONE: c |= RESP_NONE; break; 317 case MMC_RSP_R1: 318 case MMC_RSP_R1_NO_CRC: 319 c |= RESP_R1; break; 320 case MMC_RSP_R1B: c |= RESP_R1B; break; 321 case MMC_RSP_R2: c |= RESP_R2; break; 322 case MMC_RSP_R3: c |= RESP_R3; break; 323 default: 324 pr_debug("Unknown response type %d\n", mmc_resp_type(cmd)); 325 return -EINVAL; 326 } 327 328 host->cmd = cmd; 329 330 /* FIXME - this seems to be ok commented out but the spec suggest this bit 331 * should be set when issuing app commands. 332 * if(cmd->flags & MMC_FLAG_ACMD) 333 * c |= APP_CMD; 334 */ 335 if (data) { 336 c |= DATA_PRESENT; 337 if (data->blocks > 1) { 338 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, TMIO_STOP_SEC); 339 c |= TRANSFER_MULTI; 340 341 /* 342 * Disable auto CMD12 at IO_RW_EXTENDED and 343 * SET_BLOCK_COUNT when doing multiple block transfer 344 */ 345 if ((host->pdata->flags & TMIO_MMC_HAVE_CMD12_CTRL) && 346 (cmd->opcode == SD_IO_RW_EXTENDED || host->mrq->sbc)) 347 c |= NO_CMD12_ISSUE; 348 } 349 if (data->flags & MMC_DATA_READ) 350 c |= TRANSFER_READ; 351 } 352 353 if (!host->native_hotplug) 354 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT); 355 tmio_mmc_enable_mmc_irqs(host, irq_mask); 356 357 /* Fire off the command */ 358 sd_ctrl_write32_as_16_and_16(host, CTL_ARG_REG, cmd->arg); 359 sd_ctrl_write16(host, CTL_SD_CMD, c); 360 361 return 0; 362 } 363 364 static void tmio_mmc_transfer_data(struct tmio_mmc_host *host, 365 unsigned short *buf, 366 unsigned int count) 367 { 368 int is_read = host->data->flags & MMC_DATA_READ; 369 u8 *buf8; 370 371 /* 372 * Transfer the data 373 */ 374 if (host->pdata->flags & TMIO_MMC_32BIT_DATA_PORT) { 375 u32 data = 0; 376 u32 *buf32 = (u32 *)buf; 377 378 if (is_read) 379 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, buf32, 380 count >> 2); 381 else 382 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, buf32, 383 count >> 2); 384 385 /* if count was multiple of 4 */ 386 if (!(count & 0x3)) 387 return; 388 389 buf32 += count >> 2; 390 count %= 4; 391 392 if (is_read) { 393 sd_ctrl_read32_rep(host, CTL_SD_DATA_PORT, &data, 1); 394 memcpy(buf32, &data, count); 395 } else { 396 memcpy(&data, buf32, count); 397 sd_ctrl_write32_rep(host, CTL_SD_DATA_PORT, &data, 1); 398 } 399 400 return; 401 } 402 403 if (is_read) 404 sd_ctrl_read16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 405 else 406 sd_ctrl_write16_rep(host, CTL_SD_DATA_PORT, buf, count >> 1); 407 408 /* if count was even number */ 409 if (!(count & 0x1)) 410 return; 411 412 /* if count was odd number */ 413 buf8 = (u8 *)(buf + (count >> 1)); 414 415 /* 416 * FIXME 417 * 418 * driver and this function are assuming that 419 * it is used as little endian 420 */ 421 if (is_read) 422 *buf8 = sd_ctrl_read16(host, CTL_SD_DATA_PORT) & 0xff; 423 else 424 sd_ctrl_write16(host, CTL_SD_DATA_PORT, *buf8); 425 } 426 427 /* 428 * This chip always returns (at least?) as much data as you ask for. 429 * I'm unsure what happens if you ask for less than a block. This should be 430 * looked into to ensure that a funny length read doesn't hose the controller. 431 */ 432 static void tmio_mmc_pio_irq(struct tmio_mmc_host *host) 433 { 434 struct mmc_data *data = host->data; 435 void *sg_virt; 436 unsigned short *buf; 437 unsigned int count; 438 unsigned long flags; 439 440 if ((host->chan_tx || host->chan_rx) && !host->force_pio) { 441 pr_err("PIO IRQ in DMA mode!\n"); 442 return; 443 } else if (!data) { 444 pr_debug("Spurious PIO IRQ\n"); 445 return; 446 } 447 448 sg_virt = tmio_mmc_kmap_atomic(host->sg_ptr, &flags); 449 buf = (unsigned short *)(sg_virt + host->sg_off); 450 451 count = host->sg_ptr->length - host->sg_off; 452 if (count > data->blksz) 453 count = data->blksz; 454 455 pr_debug("count: %08x offset: %08x flags %08x\n", 456 count, host->sg_off, data->flags); 457 458 /* Transfer the data */ 459 tmio_mmc_transfer_data(host, buf, count); 460 461 host->sg_off += count; 462 463 tmio_mmc_kunmap_atomic(host->sg_ptr, &flags, sg_virt); 464 465 if (host->sg_off == host->sg_ptr->length) 466 tmio_mmc_next_sg(host); 467 } 468 469 static void tmio_mmc_check_bounce_buffer(struct tmio_mmc_host *host) 470 { 471 if (host->sg_ptr == &host->bounce_sg) { 472 unsigned long flags; 473 void *sg_vaddr = tmio_mmc_kmap_atomic(host->sg_orig, &flags); 474 475 memcpy(sg_vaddr, host->bounce_buf, host->bounce_sg.length); 476 tmio_mmc_kunmap_atomic(host->sg_orig, &flags, sg_vaddr); 477 } 478 } 479 480 /* needs to be called with host->lock held */ 481 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host) 482 { 483 struct mmc_data *data = host->data; 484 struct mmc_command *stop; 485 486 host->data = NULL; 487 488 if (!data) { 489 dev_warn(&host->pdev->dev, "Spurious data end IRQ\n"); 490 return; 491 } 492 stop = data->stop; 493 494 /* FIXME - return correct transfer count on errors */ 495 if (!data->error) 496 data->bytes_xfered = data->blocks * data->blksz; 497 else 498 data->bytes_xfered = 0; 499 500 pr_debug("Completed data request\n"); 501 502 /* 503 * FIXME: other drivers allow an optional stop command of any given type 504 * which we dont do, as the chip can auto generate them. 505 * Perhaps we can be smarter about when to use auto CMD12 and 506 * only issue the auto request when we know this is the desired 507 * stop command, allowing fallback to the stop command the 508 * upper layers expect. For now, we do what works. 509 */ 510 511 if (data->flags & MMC_DATA_READ) { 512 if (host->chan_rx && !host->force_pio) 513 tmio_mmc_check_bounce_buffer(host); 514 dev_dbg(&host->pdev->dev, "Complete Rx request %p\n", 515 host->mrq); 516 } else { 517 dev_dbg(&host->pdev->dev, "Complete Tx request %p\n", 518 host->mrq); 519 } 520 521 if (stop && !host->mrq->sbc) { 522 if (stop->opcode != MMC_STOP_TRANSMISSION || stop->arg) 523 dev_err(&host->pdev->dev, "unsupported stop: CMD%u,0x%x. We did CMD12,0\n", 524 stop->opcode, stop->arg); 525 526 /* fill in response from auto CMD12 */ 527 stop->resp[0] = sd_ctrl_read16_and_16_as_32(host, CTL_RESPONSE); 528 529 sd_ctrl_write16(host, CTL_STOP_INTERNAL_ACTION, 0); 530 } 531 532 schedule_work(&host->done); 533 } 534 EXPORT_SYMBOL_GPL(tmio_mmc_do_data_irq); 535 536 static void tmio_mmc_data_irq(struct tmio_mmc_host *host, unsigned int stat) 537 { 538 struct mmc_data *data; 539 540 spin_lock(&host->lock); 541 data = host->data; 542 543 if (!data) 544 goto out; 545 546 if (stat & TMIO_STAT_CRCFAIL || stat & TMIO_STAT_STOPBIT_ERR || 547 stat & TMIO_STAT_TXUNDERRUN) 548 data->error = -EILSEQ; 549 if (host->chan_tx && (data->flags & MMC_DATA_WRITE) && !host->force_pio) { 550 u32 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 551 bool done = false; 552 553 /* 554 * Has all data been written out yet? Testing on SuperH showed, 555 * that in most cases the first interrupt comes already with the 556 * BUSY status bit clear, but on some operations, like mount or 557 * in the beginning of a write / sync / umount, there is one 558 * DATAEND interrupt with the BUSY bit set, in this cases 559 * waiting for one more interrupt fixes the problem. 560 */ 561 if (host->pdata->flags & TMIO_MMC_HAS_IDLE_WAIT) { 562 if (status & TMIO_STAT_SCLKDIVEN) 563 done = true; 564 } else { 565 if (!(status & TMIO_STAT_CMD_BUSY)) 566 done = true; 567 } 568 569 if (done) { 570 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 571 tmio_mmc_dataend_dma(host); 572 } 573 } else if (host->chan_rx && (data->flags & MMC_DATA_READ) && !host->force_pio) { 574 tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_DATAEND); 575 tmio_mmc_dataend_dma(host); 576 } else { 577 tmio_mmc_do_data_irq(host); 578 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_READOP | TMIO_MASK_WRITEOP); 579 } 580 out: 581 spin_unlock(&host->lock); 582 } 583 584 static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat) 585 { 586 struct mmc_command *cmd = host->cmd; 587 int i, addr; 588 589 spin_lock(&host->lock); 590 591 if (!host->cmd) { 592 pr_debug("Spurious CMD irq\n"); 593 goto out; 594 } 595 596 /* This controller is sicker than the PXA one. Not only do we need to 597 * drop the top 8 bits of the first response word, we also need to 598 * modify the order of the response for short response command types. 599 */ 600 601 for (i = 3, addr = CTL_RESPONSE ; i >= 0 ; i--, addr += 4) 602 cmd->resp[i] = sd_ctrl_read16_and_16_as_32(host, addr); 603 604 if (cmd->flags & MMC_RSP_136) { 605 cmd->resp[0] = (cmd->resp[0] << 8) | (cmd->resp[1] >> 24); 606 cmd->resp[1] = (cmd->resp[1] << 8) | (cmd->resp[2] >> 24); 607 cmd->resp[2] = (cmd->resp[2] << 8) | (cmd->resp[3] >> 24); 608 cmd->resp[3] <<= 8; 609 } else if (cmd->flags & MMC_RSP_R3) { 610 cmd->resp[0] = cmd->resp[3]; 611 } 612 613 if (stat & TMIO_STAT_CMDTIMEOUT) 614 cmd->error = -ETIMEDOUT; 615 else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) || 616 stat & TMIO_STAT_STOPBIT_ERR || 617 stat & TMIO_STAT_CMD_IDX_ERR) 618 cmd->error = -EILSEQ; 619 620 /* If there is data to handle we enable data IRQs here, and 621 * we will ultimatley finish the request in the data_end handler. 622 * If theres no data or we encountered an error, finish now. 623 */ 624 if (host->data && (!cmd->error || cmd->error == -EILSEQ)) { 625 if (host->data->flags & MMC_DATA_READ) { 626 if (host->force_pio || !host->chan_rx) 627 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_READOP); 628 else 629 tasklet_schedule(&host->dma_issue); 630 } else { 631 if (host->force_pio || !host->chan_tx) 632 tmio_mmc_enable_mmc_irqs(host, TMIO_MASK_WRITEOP); 633 else 634 tasklet_schedule(&host->dma_issue); 635 } 636 } else { 637 schedule_work(&host->done); 638 } 639 640 out: 641 spin_unlock(&host->lock); 642 } 643 644 static bool __tmio_mmc_card_detect_irq(struct tmio_mmc_host *host, 645 int ireg, int status) 646 { 647 struct mmc_host *mmc = host->mmc; 648 649 /* Card insert / remove attempts */ 650 if (ireg & (TMIO_STAT_CARD_INSERT | TMIO_STAT_CARD_REMOVE)) { 651 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CARD_INSERT | 652 TMIO_STAT_CARD_REMOVE); 653 if ((((ireg & TMIO_STAT_CARD_REMOVE) && mmc->card) || 654 ((ireg & TMIO_STAT_CARD_INSERT) && !mmc->card)) && 655 !work_pending(&mmc->detect.work)) 656 mmc_detect_change(host->mmc, msecs_to_jiffies(100)); 657 return true; 658 } 659 660 return false; 661 } 662 663 static bool __tmio_mmc_sdcard_irq(struct tmio_mmc_host *host, int ireg, 664 int status) 665 { 666 /* Command completion */ 667 if (ireg & (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT)) { 668 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_CMDRESPEND | 669 TMIO_STAT_CMDTIMEOUT); 670 tmio_mmc_cmd_irq(host, status); 671 return true; 672 } 673 674 /* Data transfer */ 675 if (ireg & (TMIO_STAT_RXRDY | TMIO_STAT_TXRQ)) { 676 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_RXRDY | TMIO_STAT_TXRQ); 677 tmio_mmc_pio_irq(host); 678 return true; 679 } 680 681 /* Data transfer completion */ 682 if (ireg & TMIO_STAT_DATAEND) { 683 tmio_mmc_ack_mmc_irqs(host, TMIO_STAT_DATAEND); 684 tmio_mmc_data_irq(host, status); 685 return true; 686 } 687 688 return false; 689 } 690 691 static void __tmio_mmc_sdio_irq(struct tmio_mmc_host *host) 692 { 693 struct mmc_host *mmc = host->mmc; 694 struct tmio_mmc_data *pdata = host->pdata; 695 unsigned int ireg, status; 696 unsigned int sdio_status; 697 698 if (!(pdata->flags & TMIO_MMC_SDIO_IRQ)) 699 return; 700 701 status = sd_ctrl_read16(host, CTL_SDIO_STATUS); 702 ireg = status & TMIO_SDIO_MASK_ALL & ~host->sdio_irq_mask; 703 704 sdio_status = status & ~TMIO_SDIO_MASK_ALL; 705 if (pdata->flags & TMIO_MMC_SDIO_STATUS_SETBITS) 706 sdio_status |= TMIO_SDIO_SETBITS_MASK; 707 708 sd_ctrl_write16(host, CTL_SDIO_STATUS, sdio_status); 709 710 if (mmc->caps & MMC_CAP_SDIO_IRQ && ireg & TMIO_SDIO_STAT_IOIRQ) 711 mmc_signal_sdio_irq(mmc); 712 } 713 714 irqreturn_t tmio_mmc_irq(int irq, void *devid) 715 { 716 struct tmio_mmc_host *host = devid; 717 unsigned int ireg, status; 718 719 status = sd_ctrl_read16_and_16_as_32(host, CTL_STATUS); 720 ireg = status & TMIO_MASK_IRQ & ~host->sdcard_irq_mask; 721 722 /* Clear the status except the interrupt status */ 723 sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, TMIO_MASK_IRQ); 724 725 if (__tmio_mmc_card_detect_irq(host, ireg, status)) 726 return IRQ_HANDLED; 727 if (__tmio_mmc_sdcard_irq(host, ireg, status)) 728 return IRQ_HANDLED; 729 730 __tmio_mmc_sdio_irq(host); 731 732 return IRQ_HANDLED; 733 } 734 EXPORT_SYMBOL_GPL(tmio_mmc_irq); 735 736 static int tmio_mmc_start_data(struct tmio_mmc_host *host, 737 struct mmc_data *data) 738 { 739 struct tmio_mmc_data *pdata = host->pdata; 740 741 pr_debug("setup data transfer: blocksize %08x nr_blocks %d\n", 742 data->blksz, data->blocks); 743 744 /* Some hardware cannot perform 2 byte requests in 4/8 bit mode */ 745 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4 || 746 host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) { 747 int blksz_2bytes = pdata->flags & TMIO_MMC_BLKSZ_2BYTES; 748 749 if (data->blksz < 2 || (data->blksz < 4 && !blksz_2bytes)) { 750 pr_err("%s: %d byte block unsupported in 4/8 bit mode\n", 751 mmc_hostname(host->mmc), data->blksz); 752 return -EINVAL; 753 } 754 } 755 756 tmio_mmc_init_sg(host, data); 757 host->data = data; 758 759 /* Set transfer length / blocksize */ 760 sd_ctrl_write16(host, CTL_SD_XFER_LEN, data->blksz); 761 sd_ctrl_write16(host, CTL_XFER_BLK_COUNT, data->blocks); 762 763 tmio_mmc_start_dma(host, data); 764 765 return 0; 766 } 767 768 static void tmio_mmc_hw_reset(struct mmc_host *mmc) 769 { 770 struct tmio_mmc_host *host = mmc_priv(mmc); 771 772 if (host->hw_reset) 773 host->hw_reset(host); 774 } 775 776 static int tmio_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode) 777 { 778 struct tmio_mmc_host *host = mmc_priv(mmc); 779 int i, ret = 0; 780 781 if (!host->init_tuning || !host->select_tuning) 782 /* Tuning is not supported */ 783 goto out; 784 785 host->tap_num = host->init_tuning(host); 786 if (!host->tap_num) 787 /* Tuning is not supported */ 788 goto out; 789 790 if (host->tap_num * 2 >= sizeof(host->taps) * BITS_PER_BYTE) { 791 dev_warn_once(&host->pdev->dev, 792 "Too many taps, skipping tuning. Please consider updating size of taps field of tmio_mmc_host\n"); 793 goto out; 794 } 795 796 bitmap_zero(host->taps, host->tap_num * 2); 797 798 /* Issue CMD19 twice for each tap */ 799 for (i = 0; i < 2 * host->tap_num; i++) { 800 if (host->prepare_tuning) 801 host->prepare_tuning(host, i % host->tap_num); 802 803 ret = mmc_send_tuning(mmc, opcode, NULL); 804 if (ret && ret != -EILSEQ) 805 goto out; 806 if (ret == 0) 807 set_bit(i, host->taps); 808 809 usleep_range(1000, 1200); 810 } 811 812 ret = host->select_tuning(host); 813 814 out: 815 if (ret < 0) { 816 dev_warn(&host->pdev->dev, "Tuning procedure failed\n"); 817 tmio_mmc_hw_reset(mmc); 818 } 819 820 return ret; 821 } 822 823 static void tmio_process_mrq(struct tmio_mmc_host *host, 824 struct mmc_request *mrq) 825 { 826 struct mmc_command *cmd; 827 int ret; 828 829 if (mrq->sbc && host->cmd != mrq->sbc) { 830 cmd = mrq->sbc; 831 } else { 832 cmd = mrq->cmd; 833 if (mrq->data) { 834 ret = tmio_mmc_start_data(host, mrq->data); 835 if (ret) 836 goto fail; 837 } 838 } 839 840 ret = tmio_mmc_start_command(host, cmd); 841 if (ret) 842 goto fail; 843 844 schedule_delayed_work(&host->delayed_reset_work, 845 msecs_to_jiffies(CMDREQ_TIMEOUT)); 846 return; 847 848 fail: 849 host->force_pio = false; 850 host->mrq = NULL; 851 mrq->cmd->error = ret; 852 mmc_request_done(host->mmc, mrq); 853 } 854 855 /* Process requests from the MMC layer */ 856 static void tmio_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) 857 { 858 struct tmio_mmc_host *host = mmc_priv(mmc); 859 unsigned long flags; 860 861 spin_lock_irqsave(&host->lock, flags); 862 863 if (host->mrq) { 864 pr_debug("request not null\n"); 865 if (IS_ERR(host->mrq)) { 866 spin_unlock_irqrestore(&host->lock, flags); 867 mrq->cmd->error = -EAGAIN; 868 mmc_request_done(mmc, mrq); 869 return; 870 } 871 } 872 873 host->last_req_ts = jiffies; 874 wmb(); 875 host->mrq = mrq; 876 877 spin_unlock_irqrestore(&host->lock, flags); 878 879 tmio_process_mrq(host, mrq); 880 } 881 882 static void tmio_mmc_finish_request(struct tmio_mmc_host *host) 883 { 884 struct mmc_request *mrq; 885 unsigned long flags; 886 887 spin_lock_irqsave(&host->lock, flags); 888 889 mrq = host->mrq; 890 if (IS_ERR_OR_NULL(mrq)) { 891 spin_unlock_irqrestore(&host->lock, flags); 892 return; 893 } 894 895 /* If not SET_BLOCK_COUNT, clear old data */ 896 if (host->cmd != mrq->sbc) { 897 host->cmd = NULL; 898 host->data = NULL; 899 host->force_pio = false; 900 host->mrq = NULL; 901 } 902 903 cancel_delayed_work(&host->delayed_reset_work); 904 905 spin_unlock_irqrestore(&host->lock, flags); 906 907 if (mrq->cmd->error || (mrq->data && mrq->data->error)) 908 tmio_mmc_abort_dma(host); 909 910 if (host->check_scc_error) 911 host->check_scc_error(host); 912 913 /* If SET_BLOCK_COUNT, continue with main command */ 914 if (host->mrq) { 915 tmio_process_mrq(host, mrq); 916 return; 917 } 918 919 mmc_request_done(host->mmc, mrq); 920 } 921 922 static void tmio_mmc_done_work(struct work_struct *work) 923 { 924 struct tmio_mmc_host *host = container_of(work, struct tmio_mmc_host, 925 done); 926 tmio_mmc_finish_request(host); 927 } 928 929 static void tmio_mmc_power_on(struct tmio_mmc_host *host, unsigned short vdd) 930 { 931 struct mmc_host *mmc = host->mmc; 932 int ret = 0; 933 934 /* .set_ios() is returning void, so, no chance to report an error */ 935 936 if (host->set_pwr) 937 host->set_pwr(host->pdev, 1); 938 939 if (!IS_ERR(mmc->supply.vmmc)) { 940 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); 941 /* 942 * Attention: empiric value. With a b43 WiFi SDIO card this 943 * delay proved necessary for reliable card-insertion probing. 944 * 100us were not enough. Is this the same 140us delay, as in 945 * tmio_mmc_set_ios()? 946 */ 947 usleep_range(200, 300); 948 } 949 /* 950 * It seems, VccQ should be switched on after Vcc, this is also what the 951 * omap_hsmmc.c driver does. 952 */ 953 if (!IS_ERR(mmc->supply.vqmmc) && !ret) { 954 ret = regulator_enable(mmc->supply.vqmmc); 955 usleep_range(200, 300); 956 } 957 958 if (ret < 0) 959 dev_dbg(&host->pdev->dev, "Regulators failed to power up: %d\n", 960 ret); 961 } 962 963 static void tmio_mmc_power_off(struct tmio_mmc_host *host) 964 { 965 struct mmc_host *mmc = host->mmc; 966 967 if (!IS_ERR(mmc->supply.vqmmc)) 968 regulator_disable(mmc->supply.vqmmc); 969 970 if (!IS_ERR(mmc->supply.vmmc)) 971 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 972 973 if (host->set_pwr) 974 host->set_pwr(host->pdev, 0); 975 } 976 977 static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host, 978 unsigned char bus_width) 979 { 980 u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT) 981 & ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8); 982 983 /* reg now applies to MMC_BUS_WIDTH_4 */ 984 if (bus_width == MMC_BUS_WIDTH_1) 985 reg |= CARD_OPT_WIDTH; 986 else if (bus_width == MMC_BUS_WIDTH_8) 987 reg |= CARD_OPT_WIDTH8; 988 989 sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg); 990 } 991 992 /* Set MMC clock / power. 993 * Note: This controller uses a simple divider scheme therefore it cannot 994 * run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as 995 * MMC wont run that fast, it has to be clocked at 12MHz which is the next 996 * slowest setting. 997 */ 998 static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 999 { 1000 struct tmio_mmc_host *host = mmc_priv(mmc); 1001 struct device *dev = &host->pdev->dev; 1002 unsigned long flags; 1003 1004 mutex_lock(&host->ios_lock); 1005 1006 spin_lock_irqsave(&host->lock, flags); 1007 if (host->mrq) { 1008 if (IS_ERR(host->mrq)) { 1009 dev_dbg(dev, 1010 "%s.%d: concurrent .set_ios(), clk %u, mode %u\n", 1011 current->comm, task_pid_nr(current), 1012 ios->clock, ios->power_mode); 1013 host->mrq = ERR_PTR(-EINTR); 1014 } else { 1015 dev_dbg(dev, 1016 "%s.%d: CMD%u active since %lu, now %lu!\n", 1017 current->comm, task_pid_nr(current), 1018 host->mrq->cmd->opcode, host->last_req_ts, 1019 jiffies); 1020 } 1021 spin_unlock_irqrestore(&host->lock, flags); 1022 1023 mutex_unlock(&host->ios_lock); 1024 return; 1025 } 1026 1027 host->mrq = ERR_PTR(-EBUSY); 1028 1029 spin_unlock_irqrestore(&host->lock, flags); 1030 1031 switch (ios->power_mode) { 1032 case MMC_POWER_OFF: 1033 tmio_mmc_power_off(host); 1034 tmio_mmc_clk_stop(host); 1035 break; 1036 case MMC_POWER_UP: 1037 tmio_mmc_power_on(host, ios->vdd); 1038 tmio_mmc_set_clock(host, ios->clock); 1039 tmio_mmc_set_bus_width(host, ios->bus_width); 1040 break; 1041 case MMC_POWER_ON: 1042 tmio_mmc_set_clock(host, ios->clock); 1043 tmio_mmc_set_bus_width(host, ios->bus_width); 1044 break; 1045 } 1046 1047 /* Let things settle. delay taken from winCE driver */ 1048 usleep_range(140, 200); 1049 if (PTR_ERR(host->mrq) == -EINTR) 1050 dev_dbg(&host->pdev->dev, 1051 "%s.%d: IOS interrupted: clk %u, mode %u", 1052 current->comm, task_pid_nr(current), 1053 ios->clock, ios->power_mode); 1054 host->mrq = NULL; 1055 1056 host->clk_cache = ios->clock; 1057 1058 mutex_unlock(&host->ios_lock); 1059 } 1060 1061 static int tmio_mmc_get_ro(struct mmc_host *mmc) 1062 { 1063 struct tmio_mmc_host *host = mmc_priv(mmc); 1064 struct tmio_mmc_data *pdata = host->pdata; 1065 1066 return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) || 1067 (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT)); 1068 } 1069 1070 static int tmio_multi_io_quirk(struct mmc_card *card, 1071 unsigned int direction, int blk_size) 1072 { 1073 struct tmio_mmc_host *host = mmc_priv(card->host); 1074 1075 if (host->multi_io_quirk) 1076 return host->multi_io_quirk(card, direction, blk_size); 1077 1078 return blk_size; 1079 } 1080 1081 static const struct mmc_host_ops tmio_mmc_ops = { 1082 .request = tmio_mmc_request, 1083 .set_ios = tmio_mmc_set_ios, 1084 .get_ro = tmio_mmc_get_ro, 1085 .get_cd = mmc_gpio_get_cd, 1086 .enable_sdio_irq = tmio_mmc_enable_sdio_irq, 1087 .multi_io_quirk = tmio_multi_io_quirk, 1088 .hw_reset = tmio_mmc_hw_reset, 1089 .execute_tuning = tmio_mmc_execute_tuning, 1090 }; 1091 1092 static int tmio_mmc_init_ocr(struct tmio_mmc_host *host) 1093 { 1094 struct tmio_mmc_data *pdata = host->pdata; 1095 struct mmc_host *mmc = host->mmc; 1096 int err; 1097 1098 err = mmc_regulator_get_supply(mmc); 1099 if (err) 1100 return err; 1101 1102 /* use ocr_mask if no regulator */ 1103 if (!mmc->ocr_avail) 1104 mmc->ocr_avail = pdata->ocr_mask; 1105 1106 /* 1107 * try again. 1108 * There is possibility that regulator has not been probed 1109 */ 1110 if (!mmc->ocr_avail) 1111 return -EPROBE_DEFER; 1112 1113 return 0; 1114 } 1115 1116 static void tmio_mmc_of_parse(struct platform_device *pdev, 1117 struct tmio_mmc_data *pdata) 1118 { 1119 const struct device_node *np = pdev->dev.of_node; 1120 1121 if (!np) 1122 return; 1123 1124 if (of_get_property(np, "toshiba,mmc-wrprotect-disable", NULL)) 1125 pdata->flags |= TMIO_MMC_WRPROTECT_DISABLE; 1126 } 1127 1128 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev, 1129 struct tmio_mmc_data *pdata) 1130 { 1131 struct tmio_mmc_host *host; 1132 struct mmc_host *mmc; 1133 struct resource *res; 1134 void __iomem *ctl; 1135 int ret; 1136 1137 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1138 ctl = devm_ioremap_resource(&pdev->dev, res); 1139 if (IS_ERR(ctl)) 1140 return ERR_CAST(ctl); 1141 1142 mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &pdev->dev); 1143 if (!mmc) 1144 return ERR_PTR(-ENOMEM); 1145 1146 host = mmc_priv(mmc); 1147 host->ctl = ctl; 1148 host->mmc = mmc; 1149 host->pdev = pdev; 1150 host->pdata = pdata; 1151 host->ops = tmio_mmc_ops; 1152 mmc->ops = &host->ops; 1153 1154 ret = mmc_of_parse(host->mmc); 1155 if (ret) { 1156 host = ERR_PTR(ret); 1157 goto free; 1158 } 1159 1160 tmio_mmc_of_parse(pdev, pdata); 1161 1162 platform_set_drvdata(pdev, host); 1163 1164 return host; 1165 free: 1166 mmc_free_host(mmc); 1167 1168 return host; 1169 } 1170 EXPORT_SYMBOL_GPL(tmio_mmc_host_alloc); 1171 1172 void tmio_mmc_host_free(struct tmio_mmc_host *host) 1173 { 1174 mmc_free_host(host->mmc); 1175 } 1176 EXPORT_SYMBOL_GPL(tmio_mmc_host_free); 1177 1178 int tmio_mmc_host_probe(struct tmio_mmc_host *_host) 1179 { 1180 struct platform_device *pdev = _host->pdev; 1181 struct tmio_mmc_data *pdata = _host->pdata; 1182 struct mmc_host *mmc = _host->mmc; 1183 int ret; 1184 u32 irq_mask = TMIO_MASK_CMD; 1185 1186 /* 1187 * Check the sanity of mmc->f_min to prevent tmio_mmc_set_clock() from 1188 * looping forever... 1189 */ 1190 if (mmc->f_min == 0) 1191 return -EINVAL; 1192 1193 if (!(pdata->flags & TMIO_MMC_HAS_IDLE_WAIT)) 1194 _host->write16_hook = NULL; 1195 1196 _host->set_pwr = pdata->set_pwr; 1197 _host->set_clk_div = pdata->set_clk_div; 1198 1199 ret = tmio_mmc_init_ocr(_host); 1200 if (ret < 0) 1201 return ret; 1202 1203 if (pdata->flags & TMIO_MMC_USE_GPIO_CD) { 1204 ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0); 1205 if (ret) 1206 return ret; 1207 } 1208 1209 mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities; 1210 mmc->caps2 |= pdata->capabilities2; 1211 mmc->max_segs = pdata->max_segs ? : 32; 1212 mmc->max_blk_size = 512; 1213 mmc->max_blk_count = pdata->max_blk_count ? : 1214 (PAGE_SIZE / mmc->max_blk_size) * mmc->max_segs; 1215 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 1216 /* 1217 * Since swiotlb has memory size limitation, this will calculate 1218 * the maximum size locally (because we don't have any APIs for it now) 1219 * and check the current max_req_size. And then, this will update 1220 * the max_req_size if needed as a workaround. 1221 */ 1222 if (swiotlb_max_segment()) { 1223 unsigned int max_size = (1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE; 1224 1225 if (mmc->max_req_size > max_size) 1226 mmc->max_req_size = max_size; 1227 } 1228 mmc->max_seg_size = mmc->max_req_size; 1229 1230 if (mmc_can_gpio_ro(mmc)) 1231 _host->ops.get_ro = mmc_gpio_get_ro; 1232 1233 _host->native_hotplug = !(mmc_can_gpio_cd(mmc) || 1234 mmc->caps & MMC_CAP_NEEDS_POLL || 1235 !mmc_card_is_removable(mmc)); 1236 1237 /* 1238 * On Gen2+, eMMC with NONREMOVABLE currently fails because native 1239 * hotplug gets disabled. It seems RuntimePM related yet we need further 1240 * research. Since we are planning a PM overhaul anyway, let's enforce 1241 * for now the device being active by enabling native hotplug always. 1242 */ 1243 if (pdata->flags & TMIO_MMC_MIN_RCAR2) 1244 _host->native_hotplug = true; 1245 1246 /* 1247 * While using internal tmio hardware logic for card detection, we need 1248 * to ensure it stays powered for it to work. 1249 */ 1250 if (_host->native_hotplug) 1251 pm_runtime_get_noresume(&pdev->dev); 1252 1253 _host->sdio_irq_enabled = false; 1254 if (pdata->flags & TMIO_MMC_SDIO_IRQ) 1255 _host->sdio_irq_mask = TMIO_SDIO_MASK_ALL; 1256 1257 tmio_mmc_clk_stop(_host); 1258 tmio_mmc_reset(_host); 1259 1260 _host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK); 1261 tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL); 1262 1263 /* Unmask the IRQs we want to know about */ 1264 if (!_host->chan_rx) 1265 irq_mask |= TMIO_MASK_READOP; 1266 if (!_host->chan_tx) 1267 irq_mask |= TMIO_MASK_WRITEOP; 1268 if (!_host->native_hotplug) 1269 irq_mask &= ~(TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT); 1270 1271 _host->sdcard_irq_mask &= ~irq_mask; 1272 1273 spin_lock_init(&_host->lock); 1274 mutex_init(&_host->ios_lock); 1275 1276 /* Init delayed work for request timeouts */ 1277 INIT_DELAYED_WORK(&_host->delayed_reset_work, tmio_mmc_reset_work); 1278 INIT_WORK(&_host->done, tmio_mmc_done_work); 1279 1280 /* See if we also get DMA */ 1281 tmio_mmc_request_dma(_host, pdata); 1282 1283 pm_runtime_set_active(&pdev->dev); 1284 pm_runtime_set_autosuspend_delay(&pdev->dev, 50); 1285 pm_runtime_use_autosuspend(&pdev->dev); 1286 pm_runtime_enable(&pdev->dev); 1287 1288 ret = mmc_add_host(mmc); 1289 if (ret) 1290 goto remove_host; 1291 1292 dev_pm_qos_expose_latency_limit(&pdev->dev, 100); 1293 1294 return 0; 1295 1296 remove_host: 1297 tmio_mmc_host_remove(_host); 1298 return ret; 1299 } 1300 EXPORT_SYMBOL_GPL(tmio_mmc_host_probe); 1301 1302 void tmio_mmc_host_remove(struct tmio_mmc_host *host) 1303 { 1304 struct platform_device *pdev = host->pdev; 1305 struct mmc_host *mmc = host->mmc; 1306 1307 if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) 1308 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000); 1309 1310 if (!host->native_hotplug) 1311 pm_runtime_get_sync(&pdev->dev); 1312 1313 dev_pm_qos_hide_latency_limit(&pdev->dev); 1314 1315 mmc_remove_host(mmc); 1316 cancel_work_sync(&host->done); 1317 cancel_delayed_work_sync(&host->delayed_reset_work); 1318 tmio_mmc_release_dma(host); 1319 1320 pm_runtime_put_sync(&pdev->dev); 1321 pm_runtime_disable(&pdev->dev); 1322 } 1323 EXPORT_SYMBOL_GPL(tmio_mmc_host_remove); 1324 1325 #ifdef CONFIG_PM 1326 static int tmio_mmc_clk_enable(struct tmio_mmc_host *host) 1327 { 1328 if (!host->clk_enable) 1329 return -ENOTSUPP; 1330 1331 return host->clk_enable(host); 1332 } 1333 1334 static void tmio_mmc_clk_disable(struct tmio_mmc_host *host) 1335 { 1336 if (host->clk_disable) 1337 host->clk_disable(host); 1338 } 1339 1340 int tmio_mmc_host_runtime_suspend(struct device *dev) 1341 { 1342 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1343 1344 tmio_mmc_disable_mmc_irqs(host, TMIO_MASK_ALL); 1345 1346 if (host->clk_cache) 1347 tmio_mmc_clk_stop(host); 1348 1349 tmio_mmc_clk_disable(host); 1350 1351 return 0; 1352 } 1353 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_suspend); 1354 1355 static bool tmio_mmc_can_retune(struct tmio_mmc_host *host) 1356 { 1357 return host->tap_num && mmc_can_retune(host->mmc); 1358 } 1359 1360 int tmio_mmc_host_runtime_resume(struct device *dev) 1361 { 1362 struct tmio_mmc_host *host = dev_get_drvdata(dev); 1363 1364 tmio_mmc_reset(host); 1365 tmio_mmc_clk_enable(host); 1366 1367 if (host->clk_cache) 1368 tmio_mmc_set_clock(host, host->clk_cache); 1369 1370 tmio_mmc_enable_dma(host, true); 1371 1372 if (tmio_mmc_can_retune(host) && host->select_tuning(host)) 1373 dev_warn(&host->pdev->dev, "Tuning selection failed\n"); 1374 1375 return 0; 1376 } 1377 EXPORT_SYMBOL_GPL(tmio_mmc_host_runtime_resume); 1378 #endif 1379 1380 MODULE_LICENSE("GPL v2"); 1381