mmci.c revision 06c1a121805d7870abbf037d3ccd9a609a5219f2
1/* 2 * linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver 3 * 4 * Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved. 5 * Copyright (C) 2010 ST-Ericsson SA 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11#include <linux/module.h> 12#include <linux/moduleparam.h> 13#include <linux/init.h> 14#include <linux/ioport.h> 15#include <linux/device.h> 16#include <linux/interrupt.h> 17#include <linux/kernel.h> 18#include <linux/slab.h> 19#include <linux/delay.h> 20#include <linux/err.h> 21#include <linux/highmem.h> 22#include <linux/log2.h> 23#include <linux/mmc/host.h> 24#include <linux/mmc/card.h> 25#include <linux/amba/bus.h> 26#include <linux/clk.h> 27#include <linux/scatterlist.h> 28#include <linux/gpio.h> 29#include <linux/of_gpio.h> 30#include <linux/regulator/consumer.h> 31#include <linux/dmaengine.h> 32#include <linux/dma-mapping.h> 33#include <linux/amba/mmci.h> 34#include <linux/pm_runtime.h> 35#include <linux/types.h> 36 37#include <asm/div64.h> 38#include <asm/io.h> 39#include <asm/sizes.h> 40 41#include "mmci.h" 42 43#define DRIVER_NAME "mmci-pl18x" 44 45static unsigned int fmax = 515633; 46 47/** 48 * struct variant_data - MMCI variant-specific quirks 49 * @clkreg: default value for MCICLOCK register 50 * @clkreg_enable: enable value for MMCICLOCK register 51 * @datalength_bits: number of bits in the MMCIDATALENGTH register 52 * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY 53 * is asserted (likewise for RX) 54 * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY 55 * is asserted (likewise for RX) 56 * @sdio: variant supports SDIO 57 * @st_clkdiv: true if using a ST-specific clock divider algorithm 58 * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register 59 * @pwrreg_powerup: power up value for MMCIPOWER register 60 * @signal_direction: input/out direction of bus signals can be indicated 61 */ 62struct variant_data { 63 unsigned int clkreg; 64 unsigned int clkreg_enable; 65 unsigned int datalength_bits; 66 unsigned int fifosize; 67 unsigned int fifohalfsize; 68 bool sdio; 69 bool st_clkdiv; 70 bool blksz_datactrl16; 71 u32 pwrreg_powerup; 72 bool signal_direction; 73}; 74 75static struct variant_data variant_arm = { 76 .fifosize = 16 * 4, 77 .fifohalfsize = 8 * 4, 78 .datalength_bits = 16, 79 .pwrreg_powerup = MCI_PWR_UP, 80}; 81 82static struct variant_data variant_arm_extended_fifo = { 83 .fifosize = 128 * 4, 84 .fifohalfsize = 64 * 4, 85 .datalength_bits = 16, 86 .pwrreg_powerup = MCI_PWR_UP, 87}; 88 89static struct variant_data variant_u300 = { 90 .fifosize = 16 * 4, 91 .fifohalfsize = 8 * 4, 92 .clkreg_enable = MCI_ST_U300_HWFCEN, 93 .datalength_bits = 16, 94 .sdio = true, 95 .pwrreg_powerup = MCI_PWR_ON, 96 .signal_direction = true, 97}; 98 99static struct variant_data variant_nomadik = { 100 .fifosize = 16 * 4, 101 .fifohalfsize = 8 * 4, 102 .clkreg = MCI_CLK_ENABLE, 103 .datalength_bits = 24, 104 .sdio = true, 105 .st_clkdiv = true, 106 .pwrreg_powerup = MCI_PWR_ON, 107 .signal_direction = true, 108}; 109 110static struct variant_data variant_ux500 = { 111 .fifosize = 30 * 4, 112 .fifohalfsize = 8 * 4, 113 .clkreg = MCI_CLK_ENABLE, 114 .clkreg_enable = MCI_ST_UX500_HWFCEN, 115 .datalength_bits = 24, 116 .sdio = true, 117 .st_clkdiv = true, 118 .pwrreg_powerup = MCI_PWR_ON, 119 .signal_direction = true, 120}; 121 122static struct variant_data variant_ux500v2 = { 123 .fifosize = 30 * 4, 124 .fifohalfsize = 8 * 4, 125 .clkreg = MCI_CLK_ENABLE, 126 .clkreg_enable = MCI_ST_UX500_HWFCEN, 127 .datalength_bits = 24, 128 .sdio = true, 129 .st_clkdiv = true, 130 .blksz_datactrl16 = true, 131 .pwrreg_powerup = MCI_PWR_ON, 132 .signal_direction = true, 133}; 134 135/* 136 * This must be called with host->lock held 137 */ 138static void mmci_write_clkreg(struct mmci_host *host, u32 clk) 139{ 140 if (host->clk_reg != clk) { 141 host->clk_reg = clk; 142 writel(clk, host->base + MMCICLOCK); 143 } 144} 145 146/* 147 * This must be called with host->lock held 148 */ 149static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr) 150{ 151 if (host->pwr_reg != pwr) { 152 host->pwr_reg = pwr; 153 writel(pwr, host->base + MMCIPOWER); 154 } 155} 156 157/* 158 * This must be called with host->lock held 159 */ 160static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired) 161{ 162 struct variant_data *variant = host->variant; 163 u32 clk = variant->clkreg; 164 165 if (desired) { 166 if (desired >= host->mclk) { 167 clk = MCI_CLK_BYPASS; 168 if (variant->st_clkdiv) 169 clk |= MCI_ST_UX500_NEG_EDGE; 170 host->cclk = host->mclk; 171 } else if (variant->st_clkdiv) { 172 /* 173 * DB8500 TRM says f = mclk / (clkdiv + 2) 174 * => clkdiv = (mclk / f) - 2 175 * Round the divider up so we don't exceed the max 176 * frequency 177 */ 178 clk = DIV_ROUND_UP(host->mclk, desired) - 2; 179 if (clk >= 256) 180 clk = 255; 181 host->cclk = host->mclk / (clk + 2); 182 } else { 183 /* 184 * PL180 TRM says f = mclk / (2 * (clkdiv + 1)) 185 * => clkdiv = mclk / (2 * f) - 1 186 */ 187 clk = host->mclk / (2 * desired) - 1; 188 if (clk >= 256) 189 clk = 255; 190 host->cclk = host->mclk / (2 * (clk + 1)); 191 } 192 193 clk |= variant->clkreg_enable; 194 clk |= MCI_CLK_ENABLE; 195 /* This hasn't proven to be worthwhile */ 196 /* clk |= MCI_CLK_PWRSAVE; */ 197 } 198 199 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) 200 clk |= MCI_4BIT_BUS; 201 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) 202 clk |= MCI_ST_8BIT_BUS; 203 204 mmci_write_clkreg(host, clk); 205} 206 207static void 208mmci_request_end(struct mmci_host *host, struct mmc_request *mrq) 209{ 210 writel(0, host->base + MMCICOMMAND); 211 212 BUG_ON(host->data); 213 214 host->mrq = NULL; 215 host->cmd = NULL; 216 217 mmc_request_done(host->mmc, mrq); 218 219 pm_runtime_mark_last_busy(mmc_dev(host->mmc)); 220 pm_runtime_put_autosuspend(mmc_dev(host->mmc)); 221} 222 223static void mmci_set_mask1(struct mmci_host *host, unsigned int mask) 224{ 225 void __iomem *base = host->base; 226 227 if (host->singleirq) { 228 unsigned int mask0 = readl(base + MMCIMASK0); 229 230 mask0 &= ~MCI_IRQ1MASK; 231 mask0 |= mask; 232 233 writel(mask0, base + MMCIMASK0); 234 } 235 236 writel(mask, base + MMCIMASK1); 237} 238 239static void mmci_stop_data(struct mmci_host *host) 240{ 241 writel(0, host->base + MMCIDATACTRL); 242 mmci_set_mask1(host, 0); 243 host->data = NULL; 244} 245 246static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data) 247{ 248 unsigned int flags = SG_MITER_ATOMIC; 249 250 if (data->flags & MMC_DATA_READ) 251 flags |= SG_MITER_TO_SG; 252 else 253 flags |= SG_MITER_FROM_SG; 254 255 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 256} 257 258/* 259 * All the DMA operation mode stuff goes inside this ifdef. 260 * This assumes that you have a generic DMA device interface, 261 * no custom DMA interfaces are supported. 262 */ 263#ifdef CONFIG_DMA_ENGINE 264static void __devinit mmci_dma_setup(struct mmci_host *host) 265{ 266 struct mmci_platform_data *plat = host->plat; 267 const char *rxname, *txname; 268 dma_cap_mask_t mask; 269 270 if (!plat || !plat->dma_filter) { 271 dev_info(mmc_dev(host->mmc), "no DMA platform data\n"); 272 return; 273 } 274 275 /* initialize pre request cookie */ 276 host->next_data.cookie = 1; 277 278 /* Try to acquire a generic DMA engine slave channel */ 279 dma_cap_zero(mask); 280 dma_cap_set(DMA_SLAVE, mask); 281 282 /* 283 * If only an RX channel is specified, the driver will 284 * attempt to use it bidirectionally, however if it is 285 * is specified but cannot be located, DMA will be disabled. 286 */ 287 if (plat->dma_rx_param) { 288 host->dma_rx_channel = dma_request_channel(mask, 289 plat->dma_filter, 290 plat->dma_rx_param); 291 /* E.g if no DMA hardware is present */ 292 if (!host->dma_rx_channel) 293 dev_err(mmc_dev(host->mmc), "no RX DMA channel\n"); 294 } 295 296 if (plat->dma_tx_param) { 297 host->dma_tx_channel = dma_request_channel(mask, 298 plat->dma_filter, 299 plat->dma_tx_param); 300 if (!host->dma_tx_channel) 301 dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n"); 302 } else { 303 host->dma_tx_channel = host->dma_rx_channel; 304 } 305 306 if (host->dma_rx_channel) 307 rxname = dma_chan_name(host->dma_rx_channel); 308 else 309 rxname = "none"; 310 311 if (host->dma_tx_channel) 312 txname = dma_chan_name(host->dma_tx_channel); 313 else 314 txname = "none"; 315 316 dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n", 317 rxname, txname); 318 319 /* 320 * Limit the maximum segment size in any SG entry according to 321 * the parameters of the DMA engine device. 322 */ 323 if (host->dma_tx_channel) { 324 struct device *dev = host->dma_tx_channel->device->dev; 325 unsigned int max_seg_size = dma_get_max_seg_size(dev); 326 327 if (max_seg_size < host->mmc->max_seg_size) 328 host->mmc->max_seg_size = max_seg_size; 329 } 330 if (host->dma_rx_channel) { 331 struct device *dev = host->dma_rx_channel->device->dev; 332 unsigned int max_seg_size = dma_get_max_seg_size(dev); 333 334 if (max_seg_size < host->mmc->max_seg_size) 335 host->mmc->max_seg_size = max_seg_size; 336 } 337} 338 339/* 340 * This is used in __devinit or __devexit so inline it 341 * so it can be discarded. 342 */ 343static inline void mmci_dma_release(struct mmci_host *host) 344{ 345 struct mmci_platform_data *plat = host->plat; 346 347 if (host->dma_rx_channel) 348 dma_release_channel(host->dma_rx_channel); 349 if (host->dma_tx_channel && plat->dma_tx_param) 350 dma_release_channel(host->dma_tx_channel); 351 host->dma_rx_channel = host->dma_tx_channel = NULL; 352} 353 354static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) 355{ 356 struct dma_chan *chan = host->dma_current; 357 enum dma_data_direction dir; 358 u32 status; 359 int i; 360 361 /* Wait up to 1ms for the DMA to complete */ 362 for (i = 0; ; i++) { 363 status = readl(host->base + MMCISTATUS); 364 if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100) 365 break; 366 udelay(10); 367 } 368 369 /* 370 * Check to see whether we still have some data left in the FIFO - 371 * this catches DMA controllers which are unable to monitor the 372 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non- 373 * contiguous buffers. On TX, we'll get a FIFO underrun error. 374 */ 375 if (status & MCI_RXDATAAVLBLMASK) { 376 dmaengine_terminate_all(chan); 377 if (!data->error) 378 data->error = -EIO; 379 } 380 381 if (data->flags & MMC_DATA_WRITE) { 382 dir = DMA_TO_DEVICE; 383 } else { 384 dir = DMA_FROM_DEVICE; 385 } 386 387 if (!data->host_cookie) 388 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir); 389 390 /* 391 * Use of DMA with scatter-gather is impossible. 392 * Give up with DMA and switch back to PIO mode. 393 */ 394 if (status & MCI_RXDATAAVLBLMASK) { 395 dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n"); 396 mmci_dma_release(host); 397 } 398} 399 400static void mmci_dma_data_error(struct mmci_host *host) 401{ 402 dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n"); 403 dmaengine_terminate_all(host->dma_current); 404} 405 406static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, 407 struct mmci_host_next *next) 408{ 409 struct variant_data *variant = host->variant; 410 struct dma_slave_config conf = { 411 .src_addr = host->phybase + MMCIFIFO, 412 .dst_addr = host->phybase + MMCIFIFO, 413 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 414 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 415 .src_maxburst = variant->fifohalfsize >> 2, /* # of words */ 416 .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */ 417 .device_fc = false, 418 }; 419 struct dma_chan *chan; 420 struct dma_device *device; 421 struct dma_async_tx_descriptor *desc; 422 enum dma_data_direction buffer_dirn; 423 int nr_sg; 424 425 /* Check if next job is already prepared */ 426 if (data->host_cookie && !next && 427 host->dma_current && host->dma_desc_current) 428 return 0; 429 430 if (!next) { 431 host->dma_current = NULL; 432 host->dma_desc_current = NULL; 433 } 434 435 if (data->flags & MMC_DATA_READ) { 436 conf.direction = DMA_DEV_TO_MEM; 437 buffer_dirn = DMA_FROM_DEVICE; 438 chan = host->dma_rx_channel; 439 } else { 440 conf.direction = DMA_MEM_TO_DEV; 441 buffer_dirn = DMA_TO_DEVICE; 442 chan = host->dma_tx_channel; 443 } 444 445 /* If there's no DMA channel, fall back to PIO */ 446 if (!chan) 447 return -EINVAL; 448 449 /* If less than or equal to the fifo size, don't bother with DMA */ 450 if (data->blksz * data->blocks <= variant->fifosize) 451 return -EINVAL; 452 453 device = chan->device; 454 nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, buffer_dirn); 455 if (nr_sg == 0) 456 return -EINVAL; 457 458 dmaengine_slave_config(chan, &conf); 459 desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg, 460 conf.direction, DMA_CTRL_ACK); 461 if (!desc) 462 goto unmap_exit; 463 464 if (next) { 465 next->dma_chan = chan; 466 next->dma_desc = desc; 467 } else { 468 host->dma_current = chan; 469 host->dma_desc_current = desc; 470 } 471 472 return 0; 473 474 unmap_exit: 475 if (!next) 476 dmaengine_terminate_all(chan); 477 dma_unmap_sg(device->dev, data->sg, data->sg_len, buffer_dirn); 478 return -ENOMEM; 479} 480 481static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl) 482{ 483 int ret; 484 struct mmc_data *data = host->data; 485 486 ret = mmci_dma_prep_data(host, host->data, NULL); 487 if (ret) 488 return ret; 489 490 /* Okay, go for it. */ 491 dev_vdbg(mmc_dev(host->mmc), 492 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n", 493 data->sg_len, data->blksz, data->blocks, data->flags); 494 dmaengine_submit(host->dma_desc_current); 495 dma_async_issue_pending(host->dma_current); 496 497 datactrl |= MCI_DPSM_DMAENABLE; 498 499 /* Trigger the DMA transfer */ 500 writel(datactrl, host->base + MMCIDATACTRL); 501 502 /* 503 * Let the MMCI say when the data is ended and it's time 504 * to fire next DMA request. When that happens, MMCI will 505 * call mmci_data_end() 506 */ 507 writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK, 508 host->base + MMCIMASK0); 509 return 0; 510} 511 512static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) 513{ 514 struct mmci_host_next *next = &host->next_data; 515 516 if (data->host_cookie && data->host_cookie != next->cookie) { 517 pr_warning("[%s] invalid cookie: data->host_cookie %d" 518 " host->next_data.cookie %d\n", 519 __func__, data->host_cookie, host->next_data.cookie); 520 data->host_cookie = 0; 521 } 522 523 if (!data->host_cookie) 524 return; 525 526 host->dma_desc_current = next->dma_desc; 527 host->dma_current = next->dma_chan; 528 529 next->dma_desc = NULL; 530 next->dma_chan = NULL; 531} 532 533static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq, 534 bool is_first_req) 535{ 536 struct mmci_host *host = mmc_priv(mmc); 537 struct mmc_data *data = mrq->data; 538 struct mmci_host_next *nd = &host->next_data; 539 540 if (!data) 541 return; 542 543 if (data->host_cookie) { 544 data->host_cookie = 0; 545 return; 546 } 547 548 /* if config for dma */ 549 if (((data->flags & MMC_DATA_WRITE) && host->dma_tx_channel) || 550 ((data->flags & MMC_DATA_READ) && host->dma_rx_channel)) { 551 if (mmci_dma_prep_data(host, data, nd)) 552 data->host_cookie = 0; 553 else 554 data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie; 555 } 556} 557 558static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq, 559 int err) 560{ 561 struct mmci_host *host = mmc_priv(mmc); 562 struct mmc_data *data = mrq->data; 563 struct dma_chan *chan; 564 enum dma_data_direction dir; 565 566 if (!data) 567 return; 568 569 if (data->flags & MMC_DATA_READ) { 570 dir = DMA_FROM_DEVICE; 571 chan = host->dma_rx_channel; 572 } else { 573 dir = DMA_TO_DEVICE; 574 chan = host->dma_tx_channel; 575 } 576 577 578 /* if config for dma */ 579 if (chan) { 580 if (err) 581 dmaengine_terminate_all(chan); 582 if (data->host_cookie) 583 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 584 data->sg_len, dir); 585 mrq->data->host_cookie = 0; 586 } 587} 588 589#else 590/* Blank functions if the DMA engine is not available */ 591static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) 592{ 593} 594static inline void mmci_dma_setup(struct mmci_host *host) 595{ 596} 597 598static inline void mmci_dma_release(struct mmci_host *host) 599{ 600} 601 602static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) 603{ 604} 605 606static inline void mmci_dma_data_error(struct mmci_host *host) 607{ 608} 609 610static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl) 611{ 612 return -ENOSYS; 613} 614 615#define mmci_pre_request NULL 616#define mmci_post_request NULL 617 618#endif 619 620static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) 621{ 622 struct variant_data *variant = host->variant; 623 unsigned int datactrl, timeout, irqmask; 624 unsigned long long clks; 625 void __iomem *base; 626 int blksz_bits; 627 628 dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n", 629 data->blksz, data->blocks, data->flags); 630 631 host->data = data; 632 host->size = data->blksz * data->blocks; 633 data->bytes_xfered = 0; 634 635 clks = (unsigned long long)data->timeout_ns * host->cclk; 636 do_div(clks, 1000000000UL); 637 638 timeout = data->timeout_clks + (unsigned int)clks; 639 640 base = host->base; 641 writel(timeout, base + MMCIDATATIMER); 642 writel(host->size, base + MMCIDATALENGTH); 643 644 blksz_bits = ffs(data->blksz) - 1; 645 BUG_ON(1 << blksz_bits != data->blksz); 646 647 if (variant->blksz_datactrl16) 648 datactrl = MCI_DPSM_ENABLE | (data->blksz << 16); 649 else 650 datactrl = MCI_DPSM_ENABLE | blksz_bits << 4; 651 652 if (data->flags & MMC_DATA_READ) 653 datactrl |= MCI_DPSM_DIRECTION; 654 655 /* The ST Micro variants has a special bit to enable SDIO */ 656 if (variant->sdio && host->mmc->card) 657 if (mmc_card_sdio(host->mmc->card)) { 658 /* 659 * The ST Micro variants has a special bit 660 * to enable SDIO. 661 */ 662 u32 clk; 663 664 datactrl |= MCI_ST_DPSM_SDIOEN; 665 666 /* 667 * The ST Micro variant for SDIO transfer sizes 668 * less then 8 bytes should have clock H/W flow 669 * control disabled. 670 */ 671 if ((host->size < 8) && 672 (data->flags & MMC_DATA_WRITE)) 673 clk = host->clk_reg & ~variant->clkreg_enable; 674 else 675 clk = host->clk_reg | variant->clkreg_enable; 676 677 mmci_write_clkreg(host, clk); 678 } 679 680 /* 681 * Attempt to use DMA operation mode, if this 682 * should fail, fall back to PIO mode 683 */ 684 if (!mmci_dma_start_data(host, datactrl)) 685 return; 686 687 /* IRQ mode, map the SG list for CPU reading/writing */ 688 mmci_init_sg(host, data); 689 690 if (data->flags & MMC_DATA_READ) { 691 irqmask = MCI_RXFIFOHALFFULLMASK; 692 693 /* 694 * If we have less than the fifo 'half-full' threshold to 695 * transfer, trigger a PIO interrupt as soon as any data 696 * is available. 697 */ 698 if (host->size < variant->fifohalfsize) 699 irqmask |= MCI_RXDATAAVLBLMASK; 700 } else { 701 /* 702 * We don't actually need to include "FIFO empty" here 703 * since its implicit in "FIFO half empty". 704 */ 705 irqmask = MCI_TXFIFOHALFEMPTYMASK; 706 } 707 708 writel(datactrl, base + MMCIDATACTRL); 709 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0); 710 mmci_set_mask1(host, irqmask); 711} 712 713static void 714mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c) 715{ 716 void __iomem *base = host->base; 717 718 dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n", 719 cmd->opcode, cmd->arg, cmd->flags); 720 721 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) { 722 writel(0, base + MMCICOMMAND); 723 udelay(1); 724 } 725 726 c |= cmd->opcode | MCI_CPSM_ENABLE; 727 if (cmd->flags & MMC_RSP_PRESENT) { 728 if (cmd->flags & MMC_RSP_136) 729 c |= MCI_CPSM_LONGRSP; 730 c |= MCI_CPSM_RESPONSE; 731 } 732 if (/*interrupt*/0) 733 c |= MCI_CPSM_INTERRUPT; 734 735 host->cmd = cmd; 736 737 writel(cmd->arg, base + MMCIARGUMENT); 738 writel(c, base + MMCICOMMAND); 739} 740 741static void 742mmci_data_irq(struct mmci_host *host, struct mmc_data *data, 743 unsigned int status) 744{ 745 /* First check for errors */ 746 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR| 747 MCI_TXUNDERRUN|MCI_RXOVERRUN)) { 748 u32 remain, success; 749 750 /* Terminate the DMA transfer */ 751 if (dma_inprogress(host)) 752 mmci_dma_data_error(host); 753 754 /* 755 * Calculate how far we are into the transfer. Note that 756 * the data counter gives the number of bytes transferred 757 * on the MMC bus, not on the host side. On reads, this 758 * can be as much as a FIFO-worth of data ahead. This 759 * matters for FIFO overruns only. 760 */ 761 remain = readl(host->base + MMCIDATACNT); 762 success = data->blksz * data->blocks - remain; 763 764 dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n", 765 status, success); 766 if (status & MCI_DATACRCFAIL) { 767 /* Last block was not successful */ 768 success -= 1; 769 data->error = -EILSEQ; 770 } else if (status & MCI_DATATIMEOUT) { 771 data->error = -ETIMEDOUT; 772 } else if (status & MCI_STARTBITERR) { 773 data->error = -ECOMM; 774 } else if (status & MCI_TXUNDERRUN) { 775 data->error = -EIO; 776 } else if (status & MCI_RXOVERRUN) { 777 if (success > host->variant->fifosize) 778 success -= host->variant->fifosize; 779 else 780 success = 0; 781 data->error = -EIO; 782 } 783 data->bytes_xfered = round_down(success, data->blksz); 784 } 785 786 if (status & MCI_DATABLOCKEND) 787 dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n"); 788 789 if (status & MCI_DATAEND || data->error) { 790 if (dma_inprogress(host)) 791 mmci_dma_unmap(host, data); 792 mmci_stop_data(host); 793 794 if (!data->error) 795 /* The error clause is handled above, success! */ 796 data->bytes_xfered = data->blksz * data->blocks; 797 798 if (!data->stop) { 799 mmci_request_end(host, data->mrq); 800 } else { 801 mmci_start_command(host, data->stop, 0); 802 } 803 } 804} 805 806static void 807mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, 808 unsigned int status) 809{ 810 void __iomem *base = host->base; 811 812 host->cmd = NULL; 813 814 if (status & MCI_CMDTIMEOUT) { 815 cmd->error = -ETIMEDOUT; 816 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) { 817 cmd->error = -EILSEQ; 818 } else { 819 cmd->resp[0] = readl(base + MMCIRESPONSE0); 820 cmd->resp[1] = readl(base + MMCIRESPONSE1); 821 cmd->resp[2] = readl(base + MMCIRESPONSE2); 822 cmd->resp[3] = readl(base + MMCIRESPONSE3); 823 } 824 825 if (!cmd->data || cmd->error) { 826 if (host->data) { 827 /* Terminate the DMA transfer */ 828 if (dma_inprogress(host)) 829 mmci_dma_data_error(host); 830 mmci_stop_data(host); 831 } 832 mmci_request_end(host, cmd->mrq); 833 } else if (!(cmd->data->flags & MMC_DATA_READ)) { 834 mmci_start_data(host, cmd->data); 835 } 836} 837 838static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain) 839{ 840 void __iomem *base = host->base; 841 char *ptr = buffer; 842 u32 status; 843 int host_remain = host->size; 844 845 do { 846 int count = host_remain - (readl(base + MMCIFIFOCNT) << 2); 847 848 if (count > remain) 849 count = remain; 850 851 if (count <= 0) 852 break; 853 854 /* 855 * SDIO especially may want to send something that is 856 * not divisible by 4 (as opposed to card sectors 857 * etc). Therefore make sure to always read the last bytes 858 * while only doing full 32-bit reads towards the FIFO. 859 */ 860 if (unlikely(count & 0x3)) { 861 if (count < 4) { 862 unsigned char buf[4]; 863 readsl(base + MMCIFIFO, buf, 1); 864 memcpy(ptr, buf, count); 865 } else { 866 readsl(base + MMCIFIFO, ptr, count >> 2); 867 count &= ~0x3; 868 } 869 } else { 870 readsl(base + MMCIFIFO, ptr, count >> 2); 871 } 872 873 ptr += count; 874 remain -= count; 875 host_remain -= count; 876 877 if (remain == 0) 878 break; 879 880 status = readl(base + MMCISTATUS); 881 } while (status & MCI_RXDATAAVLBL); 882 883 return ptr - buffer; 884} 885 886static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status) 887{ 888 struct variant_data *variant = host->variant; 889 void __iomem *base = host->base; 890 char *ptr = buffer; 891 892 do { 893 unsigned int count, maxcnt; 894 895 maxcnt = status & MCI_TXFIFOEMPTY ? 896 variant->fifosize : variant->fifohalfsize; 897 count = min(remain, maxcnt); 898 899 /* 900 * SDIO especially may want to send something that is 901 * not divisible by 4 (as opposed to card sectors 902 * etc), and the FIFO only accept full 32-bit writes. 903 * So compensate by adding +3 on the count, a single 904 * byte become a 32bit write, 7 bytes will be two 905 * 32bit writes etc. 906 */ 907 writesl(base + MMCIFIFO, ptr, (count + 3) >> 2); 908 909 ptr += count; 910 remain -= count; 911 912 if (remain == 0) 913 break; 914 915 status = readl(base + MMCISTATUS); 916 } while (status & MCI_TXFIFOHALFEMPTY); 917 918 return ptr - buffer; 919} 920 921/* 922 * PIO data transfer IRQ handler. 923 */ 924static irqreturn_t mmci_pio_irq(int irq, void *dev_id) 925{ 926 struct mmci_host *host = dev_id; 927 struct sg_mapping_iter *sg_miter = &host->sg_miter; 928 struct variant_data *variant = host->variant; 929 void __iomem *base = host->base; 930 unsigned long flags; 931 u32 status; 932 933 status = readl(base + MMCISTATUS); 934 935 dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status); 936 937 local_irq_save(flags); 938 939 do { 940 unsigned int remain, len; 941 char *buffer; 942 943 /* 944 * For write, we only need to test the half-empty flag 945 * here - if the FIFO is completely empty, then by 946 * definition it is more than half empty. 947 * 948 * For read, check for data available. 949 */ 950 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL))) 951 break; 952 953 if (!sg_miter_next(sg_miter)) 954 break; 955 956 buffer = sg_miter->addr; 957 remain = sg_miter->length; 958 959 len = 0; 960 if (status & MCI_RXACTIVE) 961 len = mmci_pio_read(host, buffer, remain); 962 if (status & MCI_TXACTIVE) 963 len = mmci_pio_write(host, buffer, remain, status); 964 965 sg_miter->consumed = len; 966 967 host->size -= len; 968 remain -= len; 969 970 if (remain) 971 break; 972 973 status = readl(base + MMCISTATUS); 974 } while (1); 975 976 sg_miter_stop(sg_miter); 977 978 local_irq_restore(flags); 979 980 /* 981 * If we have less than the fifo 'half-full' threshold to transfer, 982 * trigger a PIO interrupt as soon as any data is available. 983 */ 984 if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize) 985 mmci_set_mask1(host, MCI_RXDATAAVLBLMASK); 986 987 /* 988 * If we run out of data, disable the data IRQs; this 989 * prevents a race where the FIFO becomes empty before 990 * the chip itself has disabled the data path, and 991 * stops us racing with our data end IRQ. 992 */ 993 if (host->size == 0) { 994 mmci_set_mask1(host, 0); 995 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0); 996 } 997 998 return IRQ_HANDLED; 999} 1000 1001/* 1002 * Handle completion of command and data transfers. 1003 */ 1004static irqreturn_t mmci_irq(int irq, void *dev_id) 1005{ 1006 struct mmci_host *host = dev_id; 1007 u32 status; 1008 int ret = 0; 1009 1010 spin_lock(&host->lock); 1011 1012 do { 1013 struct mmc_command *cmd; 1014 struct mmc_data *data; 1015 1016 status = readl(host->base + MMCISTATUS); 1017 1018 if (host->singleirq) { 1019 if (status & readl(host->base + MMCIMASK1)) 1020 mmci_pio_irq(irq, dev_id); 1021 1022 status &= ~MCI_IRQ1MASK; 1023 } 1024 1025 status &= readl(host->base + MMCIMASK0); 1026 writel(status, host->base + MMCICLEAR); 1027 1028 dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status); 1029 1030 data = host->data; 1031 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR| 1032 MCI_TXUNDERRUN|MCI_RXOVERRUN|MCI_DATAEND| 1033 MCI_DATABLOCKEND) && data) 1034 mmci_data_irq(host, data, status); 1035 1036 cmd = host->cmd; 1037 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd) 1038 mmci_cmd_irq(host, cmd, status); 1039 1040 ret = 1; 1041 } while (status); 1042 1043 spin_unlock(&host->lock); 1044 1045 return IRQ_RETVAL(ret); 1046} 1047 1048static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq) 1049{ 1050 struct mmci_host *host = mmc_priv(mmc); 1051 unsigned long flags; 1052 1053 WARN_ON(host->mrq != NULL); 1054 1055 if (mrq->data && !is_power_of_2(mrq->data->blksz)) { 1056 dev_err(mmc_dev(mmc), "unsupported block size (%d bytes)\n", 1057 mrq->data->blksz); 1058 mrq->cmd->error = -EINVAL; 1059 mmc_request_done(mmc, mrq); 1060 return; 1061 } 1062 1063 pm_runtime_get_sync(mmc_dev(mmc)); 1064 1065 spin_lock_irqsave(&host->lock, flags); 1066 1067 host->mrq = mrq; 1068 1069 if (mrq->data) 1070 mmci_get_next_data(host, mrq->data); 1071 1072 if (mrq->data && mrq->data->flags & MMC_DATA_READ) 1073 mmci_start_data(host, mrq->data); 1074 1075 mmci_start_command(host, mrq->cmd, 0); 1076 1077 spin_unlock_irqrestore(&host->lock, flags); 1078} 1079 1080static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1081{ 1082 struct mmci_host *host = mmc_priv(mmc); 1083 struct variant_data *variant = host->variant; 1084 u32 pwr = 0; 1085 unsigned long flags; 1086 int ret; 1087 1088 pm_runtime_get_sync(mmc_dev(mmc)); 1089 1090 if (host->plat->ios_handler && 1091 host->plat->ios_handler(mmc_dev(mmc), ios)) 1092 dev_err(mmc_dev(mmc), "platform ios_handler failed\n"); 1093 1094 switch (ios->power_mode) { 1095 case MMC_POWER_OFF: 1096 if (host->vcc) 1097 ret = mmc_regulator_set_ocr(mmc, host->vcc, 0); 1098 break; 1099 case MMC_POWER_UP: 1100 if (host->vcc) { 1101 ret = mmc_regulator_set_ocr(mmc, host->vcc, ios->vdd); 1102 if (ret) { 1103 dev_err(mmc_dev(mmc), "unable to set OCR\n"); 1104 /* 1105 * The .set_ios() function in the mmc_host_ops 1106 * struct return void, and failing to set the 1107 * power should be rare so we print an error 1108 * and return here. 1109 */ 1110 goto out; 1111 } 1112 } 1113 /* 1114 * The ST Micro variant doesn't have the PL180s MCI_PWR_UP 1115 * and instead uses MCI_PWR_ON so apply whatever value is 1116 * configured in the variant data. 1117 */ 1118 pwr |= variant->pwrreg_powerup; 1119 1120 break; 1121 case MMC_POWER_ON: 1122 pwr |= MCI_PWR_ON; 1123 break; 1124 } 1125 1126 if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) { 1127 /* 1128 * The ST Micro variant has some additional bits 1129 * indicating signal direction for the signals in 1130 * the SD/MMC bus and feedback-clock usage. 1131 */ 1132 pwr |= host->plat->sigdir; 1133 1134 if (ios->bus_width == MMC_BUS_WIDTH_4) 1135 pwr &= ~MCI_ST_DATA74DIREN; 1136 else if (ios->bus_width == MMC_BUS_WIDTH_1) 1137 pwr &= (~MCI_ST_DATA74DIREN & 1138 ~MCI_ST_DATA31DIREN & 1139 ~MCI_ST_DATA2DIREN); 1140 } 1141 1142 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) { 1143 if (host->hw_designer != AMBA_VENDOR_ST) 1144 pwr |= MCI_ROD; 1145 else { 1146 /* 1147 * The ST Micro variant use the ROD bit for something 1148 * else and only has OD (Open Drain). 1149 */ 1150 pwr |= MCI_OD; 1151 } 1152 } 1153 1154 spin_lock_irqsave(&host->lock, flags); 1155 1156 mmci_set_clkreg(host, ios->clock); 1157 mmci_write_pwrreg(host, pwr); 1158 1159 spin_unlock_irqrestore(&host->lock, flags); 1160 1161 out: 1162 pm_runtime_mark_last_busy(mmc_dev(mmc)); 1163 pm_runtime_put_autosuspend(mmc_dev(mmc)); 1164} 1165 1166static int mmci_get_ro(struct mmc_host *mmc) 1167{ 1168 struct mmci_host *host = mmc_priv(mmc); 1169 1170 if (host->gpio_wp == -ENOSYS) 1171 return -ENOSYS; 1172 1173 return gpio_get_value_cansleep(host->gpio_wp); 1174} 1175 1176static int mmci_get_cd(struct mmc_host *mmc) 1177{ 1178 struct mmci_host *host = mmc_priv(mmc); 1179 struct mmci_platform_data *plat = host->plat; 1180 unsigned int status; 1181 1182 if (host->gpio_cd == -ENOSYS) { 1183 if (!plat->status) 1184 return 1; /* Assume always present */ 1185 1186 status = plat->status(mmc_dev(host->mmc)); 1187 } else 1188 status = !!gpio_get_value_cansleep(host->gpio_cd) 1189 ^ plat->cd_invert; 1190 1191 /* 1192 * Use positive logic throughout - status is zero for no card, 1193 * non-zero for card inserted. 1194 */ 1195 return status; 1196} 1197 1198static irqreturn_t mmci_cd_irq(int irq, void *dev_id) 1199{ 1200 struct mmci_host *host = dev_id; 1201 1202 mmc_detect_change(host->mmc, msecs_to_jiffies(500)); 1203 1204 return IRQ_HANDLED; 1205} 1206 1207static const struct mmc_host_ops mmci_ops = { 1208 .request = mmci_request, 1209 .pre_req = mmci_pre_request, 1210 .post_req = mmci_post_request, 1211 .set_ios = mmci_set_ios, 1212 .get_ro = mmci_get_ro, 1213 .get_cd = mmci_get_cd, 1214}; 1215 1216#ifdef CONFIG_OF 1217static void mmci_dt_populate_generic_pdata(struct device_node *np, 1218 struct mmci_platform_data *pdata) 1219{ 1220 int bus_width = 0; 1221 1222 pdata->gpio_wp = of_get_named_gpio(np, "wp-gpios", 0); 1223 pdata->gpio_cd = of_get_named_gpio(np, "cd-gpios", 0); 1224 1225 if (of_get_property(np, "cd-inverted", NULL)) 1226 pdata->cd_invert = true; 1227 else 1228 pdata->cd_invert = false; 1229 1230 of_property_read_u32(np, "max-frequency", &pdata->f_max); 1231 if (!pdata->f_max) 1232 pr_warn("%s has no 'max-frequency' property\n", np->full_name); 1233 1234 if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL)) 1235 pdata->capabilities |= MMC_CAP_MMC_HIGHSPEED; 1236 if (of_get_property(np, "mmc-cap-sd-highspeed", NULL)) 1237 pdata->capabilities |= MMC_CAP_SD_HIGHSPEED; 1238 1239 of_property_read_u32(np, "bus-width", &bus_width); 1240 switch (bus_width) { 1241 case 0 : 1242 /* No bus-width supplied. */ 1243 break; 1244 case 4 : 1245 pdata->capabilities |= MMC_CAP_4_BIT_DATA; 1246 break; 1247 case 8 : 1248 pdata->capabilities |= MMC_CAP_8_BIT_DATA; 1249 break; 1250 default : 1251 pr_warn("%s: Unsupported bus width\n", np->full_name); 1252 } 1253} 1254#else 1255static void mmci_dt_populate_generic_pdata(struct device_node *np, 1256 struct mmci_platform_data *pdata) 1257{ 1258 return; 1259} 1260#endif 1261 1262static int __devinit mmci_probe(struct amba_device *dev, 1263 const struct amba_id *id) 1264{ 1265 struct mmci_platform_data *plat = dev->dev.platform_data; 1266 struct device_node *np = dev->dev.of_node; 1267 struct variant_data *variant = id->data; 1268 struct mmci_host *host; 1269 struct mmc_host *mmc; 1270 int ret; 1271 1272 /* Must have platform data or Device Tree. */ 1273 if (!plat && !np) { 1274 dev_err(&dev->dev, "No plat data or DT found\n"); 1275 return -EINVAL; 1276 } 1277 1278 if (!plat) { 1279 plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL); 1280 if (!plat) 1281 return -ENOMEM; 1282 } 1283 1284 if (np) 1285 mmci_dt_populate_generic_pdata(np, plat); 1286 1287 ret = amba_request_regions(dev, DRIVER_NAME); 1288 if (ret) 1289 goto out; 1290 1291 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev); 1292 if (!mmc) { 1293 ret = -ENOMEM; 1294 goto rel_regions; 1295 } 1296 1297 host = mmc_priv(mmc); 1298 host->mmc = mmc; 1299 1300 host->gpio_wp = -ENOSYS; 1301 host->gpio_cd = -ENOSYS; 1302 host->gpio_cd_irq = -1; 1303 1304 host->hw_designer = amba_manf(dev); 1305 host->hw_revision = amba_rev(dev); 1306 dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer); 1307 dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision); 1308 1309 host->clk = clk_get(&dev->dev, NULL); 1310 if (IS_ERR(host->clk)) { 1311 ret = PTR_ERR(host->clk); 1312 host->clk = NULL; 1313 goto host_free; 1314 } 1315 1316 ret = clk_prepare_enable(host->clk); 1317 if (ret) 1318 goto clk_free; 1319 1320 host->plat = plat; 1321 host->variant = variant; 1322 host->mclk = clk_get_rate(host->clk); 1323 /* 1324 * According to the spec, mclk is max 100 MHz, 1325 * so we try to adjust the clock down to this, 1326 * (if possible). 1327 */ 1328 if (host->mclk > 100000000) { 1329 ret = clk_set_rate(host->clk, 100000000); 1330 if (ret < 0) 1331 goto clk_disable; 1332 host->mclk = clk_get_rate(host->clk); 1333 dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n", 1334 host->mclk); 1335 } 1336 host->phybase = dev->res.start; 1337 host->base = ioremap(dev->res.start, resource_size(&dev->res)); 1338 if (!host->base) { 1339 ret = -ENOMEM; 1340 goto clk_disable; 1341 } 1342 1343 mmc->ops = &mmci_ops; 1344 /* 1345 * The ARM and ST versions of the block have slightly different 1346 * clock divider equations which means that the minimum divider 1347 * differs too. 1348 */ 1349 if (variant->st_clkdiv) 1350 mmc->f_min = DIV_ROUND_UP(host->mclk, 257); 1351 else 1352 mmc->f_min = DIV_ROUND_UP(host->mclk, 512); 1353 /* 1354 * If the platform data supplies a maximum operating 1355 * frequency, this takes precedence. Else, we fall back 1356 * to using the module parameter, which has a (low) 1357 * default value in case it is not specified. Either 1358 * value must not exceed the clock rate into the block, 1359 * of course. 1360 */ 1361 if (plat->f_max) 1362 mmc->f_max = min(host->mclk, plat->f_max); 1363 else 1364 mmc->f_max = min(host->mclk, fmax); 1365 dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max); 1366 1367#ifdef CONFIG_REGULATOR 1368 /* If we're using the regulator framework, try to fetch a regulator */ 1369 host->vcc = regulator_get(&dev->dev, "vmmc"); 1370 if (IS_ERR(host->vcc)) 1371 host->vcc = NULL; 1372 else { 1373 int mask = mmc_regulator_get_ocrmask(host->vcc); 1374 1375 if (mask < 0) 1376 dev_err(&dev->dev, "error getting OCR mask (%d)\n", 1377 mask); 1378 else { 1379 host->mmc->ocr_avail = (u32) mask; 1380 if (plat->ocr_mask) 1381 dev_warn(&dev->dev, 1382 "Provided ocr_mask/setpower will not be used " 1383 "(using regulator instead)\n"); 1384 } 1385 } 1386#endif 1387 /* Fall back to platform data if no regulator is found */ 1388 if (host->vcc == NULL) 1389 mmc->ocr_avail = plat->ocr_mask; 1390 mmc->caps = plat->capabilities; 1391 mmc->caps2 = plat->capabilities2; 1392 1393 /* 1394 * We can do SGIO 1395 */ 1396 mmc->max_segs = NR_SG; 1397 1398 /* 1399 * Since only a certain number of bits are valid in the data length 1400 * register, we must ensure that we don't exceed 2^num-1 bytes in a 1401 * single request. 1402 */ 1403 mmc->max_req_size = (1 << variant->datalength_bits) - 1; 1404 1405 /* 1406 * Set the maximum segment size. Since we aren't doing DMA 1407 * (yet) we are only limited by the data length register. 1408 */ 1409 mmc->max_seg_size = mmc->max_req_size; 1410 1411 /* 1412 * Block size can be up to 2048 bytes, but must be a power of two. 1413 */ 1414 mmc->max_blk_size = 1 << 11; 1415 1416 /* 1417 * Limit the number of blocks transferred so that we don't overflow 1418 * the maximum request size. 1419 */ 1420 mmc->max_blk_count = mmc->max_req_size >> 11; 1421 1422 spin_lock_init(&host->lock); 1423 1424 writel(0, host->base + MMCIMASK0); 1425 writel(0, host->base + MMCIMASK1); 1426 writel(0xfff, host->base + MMCICLEAR); 1427 1428 if (plat->gpio_cd == -EPROBE_DEFER) { 1429 ret = -EPROBE_DEFER; 1430 goto err_gpio_cd; 1431 } 1432 if (gpio_is_valid(plat->gpio_cd)) { 1433 ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)"); 1434 if (ret == 0) 1435 ret = gpio_direction_input(plat->gpio_cd); 1436 if (ret == 0) 1437 host->gpio_cd = plat->gpio_cd; 1438 else if (ret != -ENOSYS) 1439 goto err_gpio_cd; 1440 1441 /* 1442 * A gpio pin that will detect cards when inserted and removed 1443 * will most likely want to trigger on the edges if it is 1444 * 0 when ejected and 1 when inserted (or mutatis mutandis 1445 * for the inverted case) so we request triggers on both 1446 * edges. 1447 */ 1448 ret = request_any_context_irq(gpio_to_irq(plat->gpio_cd), 1449 mmci_cd_irq, 1450 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 1451 DRIVER_NAME " (cd)", host); 1452 if (ret >= 0) 1453 host->gpio_cd_irq = gpio_to_irq(plat->gpio_cd); 1454 } 1455 if (plat->gpio_wp == -EPROBE_DEFER) { 1456 ret = -EPROBE_DEFER; 1457 goto err_gpio_wp; 1458 } 1459 if (gpio_is_valid(plat->gpio_wp)) { 1460 ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)"); 1461 if (ret == 0) 1462 ret = gpio_direction_input(plat->gpio_wp); 1463 if (ret == 0) 1464 host->gpio_wp = plat->gpio_wp; 1465 else if (ret != -ENOSYS) 1466 goto err_gpio_wp; 1467 } 1468 1469 if ((host->plat->status || host->gpio_cd != -ENOSYS) 1470 && host->gpio_cd_irq < 0) 1471 mmc->caps |= MMC_CAP_NEEDS_POLL; 1472 1473 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host); 1474 if (ret) 1475 goto unmap; 1476 1477 if (!dev->irq[1]) 1478 host->singleirq = true; 1479 else { 1480 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, 1481 DRIVER_NAME " (pio)", host); 1482 if (ret) 1483 goto irq0_free; 1484 } 1485 1486 writel(MCI_IRQENABLE, host->base + MMCIMASK0); 1487 1488 amba_set_drvdata(dev, mmc); 1489 1490 dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n", 1491 mmc_hostname(mmc), amba_part(dev), amba_manf(dev), 1492 amba_rev(dev), (unsigned long long)dev->res.start, 1493 dev->irq[0], dev->irq[1]); 1494 1495 mmci_dma_setup(host); 1496 1497 pm_runtime_set_autosuspend_delay(&dev->dev, 50); 1498 pm_runtime_use_autosuspend(&dev->dev); 1499 pm_runtime_put(&dev->dev); 1500 1501 mmc_add_host(mmc); 1502 1503 return 0; 1504 1505 irq0_free: 1506 free_irq(dev->irq[0], host); 1507 unmap: 1508 if (host->gpio_wp != -ENOSYS) 1509 gpio_free(host->gpio_wp); 1510 err_gpio_wp: 1511 if (host->gpio_cd_irq >= 0) 1512 free_irq(host->gpio_cd_irq, host); 1513 if (host->gpio_cd != -ENOSYS) 1514 gpio_free(host->gpio_cd); 1515 err_gpio_cd: 1516 iounmap(host->base); 1517 clk_disable: 1518 clk_disable_unprepare(host->clk); 1519 clk_free: 1520 clk_put(host->clk); 1521 host_free: 1522 mmc_free_host(mmc); 1523 rel_regions: 1524 amba_release_regions(dev); 1525 out: 1526 return ret; 1527} 1528 1529static int __devexit mmci_remove(struct amba_device *dev) 1530{ 1531 struct mmc_host *mmc = amba_get_drvdata(dev); 1532 1533 amba_set_drvdata(dev, NULL); 1534 1535 if (mmc) { 1536 struct mmci_host *host = mmc_priv(mmc); 1537 1538 /* 1539 * Undo pm_runtime_put() in probe. We use the _sync 1540 * version here so that we can access the primecell. 1541 */ 1542 pm_runtime_get_sync(&dev->dev); 1543 1544 mmc_remove_host(mmc); 1545 1546 writel(0, host->base + MMCIMASK0); 1547 writel(0, host->base + MMCIMASK1); 1548 1549 writel(0, host->base + MMCICOMMAND); 1550 writel(0, host->base + MMCIDATACTRL); 1551 1552 mmci_dma_release(host); 1553 free_irq(dev->irq[0], host); 1554 if (!host->singleirq) 1555 free_irq(dev->irq[1], host); 1556 1557 if (host->gpio_wp != -ENOSYS) 1558 gpio_free(host->gpio_wp); 1559 if (host->gpio_cd_irq >= 0) 1560 free_irq(host->gpio_cd_irq, host); 1561 if (host->gpio_cd != -ENOSYS) 1562 gpio_free(host->gpio_cd); 1563 1564 iounmap(host->base); 1565 clk_disable_unprepare(host->clk); 1566 clk_put(host->clk); 1567 1568 if (host->vcc) 1569 mmc_regulator_set_ocr(mmc, host->vcc, 0); 1570 regulator_put(host->vcc); 1571 1572 mmc_free_host(mmc); 1573 1574 amba_release_regions(dev); 1575 } 1576 1577 return 0; 1578} 1579 1580#ifdef CONFIG_SUSPEND 1581static int mmci_suspend(struct device *dev) 1582{ 1583 struct amba_device *adev = to_amba_device(dev); 1584 struct mmc_host *mmc = amba_get_drvdata(adev); 1585 int ret = 0; 1586 1587 if (mmc) { 1588 struct mmci_host *host = mmc_priv(mmc); 1589 1590 ret = mmc_suspend_host(mmc); 1591 if (ret == 0) { 1592 pm_runtime_get_sync(dev); 1593 writel(0, host->base + MMCIMASK0); 1594 } 1595 } 1596 1597 return ret; 1598} 1599 1600static int mmci_resume(struct device *dev) 1601{ 1602 struct amba_device *adev = to_amba_device(dev); 1603 struct mmc_host *mmc = amba_get_drvdata(adev); 1604 int ret = 0; 1605 1606 if (mmc) { 1607 struct mmci_host *host = mmc_priv(mmc); 1608 1609 writel(MCI_IRQENABLE, host->base + MMCIMASK0); 1610 pm_runtime_put(dev); 1611 1612 ret = mmc_resume_host(mmc); 1613 } 1614 1615 return ret; 1616} 1617#endif 1618 1619static const struct dev_pm_ops mmci_dev_pm_ops = { 1620 SET_SYSTEM_SLEEP_PM_OPS(mmci_suspend, mmci_resume) 1621}; 1622 1623static struct amba_id mmci_ids[] = { 1624 { 1625 .id = 0x00041180, 1626 .mask = 0xff0fffff, 1627 .data = &variant_arm, 1628 }, 1629 { 1630 .id = 0x01041180, 1631 .mask = 0xff0fffff, 1632 .data = &variant_arm_extended_fifo, 1633 }, 1634 { 1635 .id = 0x00041181, 1636 .mask = 0x000fffff, 1637 .data = &variant_arm, 1638 }, 1639 /* ST Micro variants */ 1640 { 1641 .id = 0x00180180, 1642 .mask = 0x00ffffff, 1643 .data = &variant_u300, 1644 }, 1645 { 1646 .id = 0x10180180, 1647 .mask = 0xf0ffffff, 1648 .data = &variant_nomadik, 1649 }, 1650 { 1651 .id = 0x00280180, 1652 .mask = 0x00ffffff, 1653 .data = &variant_u300, 1654 }, 1655 { 1656 .id = 0x00480180, 1657 .mask = 0xf0ffffff, 1658 .data = &variant_ux500, 1659 }, 1660 { 1661 .id = 0x10480180, 1662 .mask = 0xf0ffffff, 1663 .data = &variant_ux500v2, 1664 }, 1665 { 0, 0 }, 1666}; 1667 1668MODULE_DEVICE_TABLE(amba, mmci_ids); 1669 1670static struct amba_driver mmci_driver = { 1671 .drv = { 1672 .name = DRIVER_NAME, 1673 .pm = &mmci_dev_pm_ops, 1674 }, 1675 .probe = mmci_probe, 1676 .remove = __devexit_p(mmci_remove), 1677 .id_table = mmci_ids, 1678}; 1679 1680module_amba_driver(mmci_driver); 1681 1682module_param(fmax, uint, 0444); 1683 1684MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver"); 1685MODULE_LICENSE("GPL"); 1686