mmci.c revision 3b6e3c73851a9a4b0e6ed9d378206341dd65e8a5
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/delay.h> 19#include <linux/err.h> 20#include <linux/highmem.h> 21#include <linux/log2.h> 22#include <linux/mmc/host.h> 23#include <linux/mmc/card.h> 24#include <linux/amba/bus.h> 25#include <linux/clk.h> 26#include <linux/scatterlist.h> 27#include <linux/gpio.h> 28#include <linux/regulator/consumer.h> 29#include <linux/dmaengine.h> 30#include <linux/dma-mapping.h> 31#include <linux/amba/mmci.h> 32#include <linux/pm_runtime.h> 33 34#include <asm/div64.h> 35#include <asm/io.h> 36#include <asm/sizes.h> 37 38#include "mmci.h" 39 40#define DRIVER_NAME "mmci-pl18x" 41 42static unsigned int fmax = 515633; 43 44/** 45 * struct variant_data - MMCI variant-specific quirks 46 * @clkreg: default value for MCICLOCK register 47 * @clkreg_enable: enable value for MMCICLOCK register 48 * @datalength_bits: number of bits in the MMCIDATALENGTH register 49 * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY 50 * is asserted (likewise for RX) 51 * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY 52 * is asserted (likewise for RX) 53 * @sdio: variant supports SDIO 54 * @st_clkdiv: true if using a ST-specific clock divider algorithm 55 * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register 56 */ 57struct variant_data { 58 unsigned int clkreg; 59 unsigned int clkreg_enable; 60 unsigned int datalength_bits; 61 unsigned int fifosize; 62 unsigned int fifohalfsize; 63 bool sdio; 64 bool st_clkdiv; 65 bool blksz_datactrl16; 66}; 67 68static struct variant_data variant_arm = { 69 .fifosize = 16 * 4, 70 .fifohalfsize = 8 * 4, 71 .datalength_bits = 16, 72}; 73 74static struct variant_data variant_arm_extended_fifo = { 75 .fifosize = 128 * 4, 76 .fifohalfsize = 64 * 4, 77 .datalength_bits = 16, 78}; 79 80static struct variant_data variant_u300 = { 81 .fifosize = 16 * 4, 82 .fifohalfsize = 8 * 4, 83 .clkreg_enable = MCI_ST_U300_HWFCEN, 84 .datalength_bits = 16, 85 .sdio = true, 86}; 87 88static struct variant_data variant_ux500 = { 89 .fifosize = 30 * 4, 90 .fifohalfsize = 8 * 4, 91 .clkreg = MCI_CLK_ENABLE, 92 .clkreg_enable = MCI_ST_UX500_HWFCEN, 93 .datalength_bits = 24, 94 .sdio = true, 95 .st_clkdiv = true, 96}; 97 98static struct variant_data variant_ux500v2 = { 99 .fifosize = 30 * 4, 100 .fifohalfsize = 8 * 4, 101 .clkreg = MCI_CLK_ENABLE, 102 .clkreg_enable = MCI_ST_UX500_HWFCEN, 103 .datalength_bits = 24, 104 .sdio = true, 105 .st_clkdiv = true, 106 .blksz_datactrl16 = true, 107}; 108 109/* 110 * This must be called with host->lock held 111 */ 112static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired) 113{ 114 struct variant_data *variant = host->variant; 115 u32 clk = variant->clkreg; 116 117 if (desired) { 118 if (desired >= host->mclk) { 119 clk = MCI_CLK_BYPASS; 120 if (variant->st_clkdiv) 121 clk |= MCI_ST_UX500_NEG_EDGE; 122 host->cclk = host->mclk; 123 } else if (variant->st_clkdiv) { 124 /* 125 * DB8500 TRM says f = mclk / (clkdiv + 2) 126 * => clkdiv = (mclk / f) - 2 127 * Round the divider up so we don't exceed the max 128 * frequency 129 */ 130 clk = DIV_ROUND_UP(host->mclk, desired) - 2; 131 if (clk >= 256) 132 clk = 255; 133 host->cclk = host->mclk / (clk + 2); 134 } else { 135 /* 136 * PL180 TRM says f = mclk / (2 * (clkdiv + 1)) 137 * => clkdiv = mclk / (2 * f) - 1 138 */ 139 clk = host->mclk / (2 * desired) - 1; 140 if (clk >= 256) 141 clk = 255; 142 host->cclk = host->mclk / (2 * (clk + 1)); 143 } 144 145 clk |= variant->clkreg_enable; 146 clk |= MCI_CLK_ENABLE; 147 /* This hasn't proven to be worthwhile */ 148 /* clk |= MCI_CLK_PWRSAVE; */ 149 } 150 151 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) 152 clk |= MCI_4BIT_BUS; 153 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) 154 clk |= MCI_ST_8BIT_BUS; 155 156 writel(clk, host->base + MMCICLOCK); 157} 158 159static void 160mmci_request_end(struct mmci_host *host, struct mmc_request *mrq) 161{ 162 writel(0, host->base + MMCICOMMAND); 163 164 BUG_ON(host->data); 165 166 host->mrq = NULL; 167 host->cmd = NULL; 168 169 /* 170 * Need to drop the host lock here; mmc_request_done may call 171 * back into the driver... 172 */ 173 spin_unlock(&host->lock); 174 pm_runtime_put(mmc_dev(host->mmc)); 175 mmc_request_done(host->mmc, mrq); 176 spin_lock(&host->lock); 177} 178 179static void mmci_set_mask1(struct mmci_host *host, unsigned int mask) 180{ 181 void __iomem *base = host->base; 182 183 if (host->singleirq) { 184 unsigned int mask0 = readl(base + MMCIMASK0); 185 186 mask0 &= ~MCI_IRQ1MASK; 187 mask0 |= mask; 188 189 writel(mask0, base + MMCIMASK0); 190 } 191 192 writel(mask, base + MMCIMASK1); 193} 194 195static void mmci_stop_data(struct mmci_host *host) 196{ 197 writel(0, host->base + MMCIDATACTRL); 198 mmci_set_mask1(host, 0); 199 host->data = NULL; 200} 201 202static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data) 203{ 204 unsigned int flags = SG_MITER_ATOMIC; 205 206 if (data->flags & MMC_DATA_READ) 207 flags |= SG_MITER_TO_SG; 208 else 209 flags |= SG_MITER_FROM_SG; 210 211 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 212} 213 214/* 215 * All the DMA operation mode stuff goes inside this ifdef. 216 * This assumes that you have a generic DMA device interface, 217 * no custom DMA interfaces are supported. 218 */ 219#ifdef CONFIG_DMA_ENGINE 220static void __devinit mmci_dma_setup(struct mmci_host *host) 221{ 222 struct mmci_platform_data *plat = host->plat; 223 const char *rxname, *txname; 224 dma_cap_mask_t mask; 225 226 if (!plat || !plat->dma_filter) { 227 dev_info(mmc_dev(host->mmc), "no DMA platform data\n"); 228 return; 229 } 230 231 /* initialize pre request cookie */ 232 host->next_data.cookie = 1; 233 234 /* Try to acquire a generic DMA engine slave channel */ 235 dma_cap_zero(mask); 236 dma_cap_set(DMA_SLAVE, mask); 237 238 /* 239 * If only an RX channel is specified, the driver will 240 * attempt to use it bidirectionally, however if it is 241 * is specified but cannot be located, DMA will be disabled. 242 */ 243 if (plat->dma_rx_param) { 244 host->dma_rx_channel = dma_request_channel(mask, 245 plat->dma_filter, 246 plat->dma_rx_param); 247 /* E.g if no DMA hardware is present */ 248 if (!host->dma_rx_channel) 249 dev_err(mmc_dev(host->mmc), "no RX DMA channel\n"); 250 } 251 252 if (plat->dma_tx_param) { 253 host->dma_tx_channel = dma_request_channel(mask, 254 plat->dma_filter, 255 plat->dma_tx_param); 256 if (!host->dma_tx_channel) 257 dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n"); 258 } else { 259 host->dma_tx_channel = host->dma_rx_channel; 260 } 261 262 if (host->dma_rx_channel) 263 rxname = dma_chan_name(host->dma_rx_channel); 264 else 265 rxname = "none"; 266 267 if (host->dma_tx_channel) 268 txname = dma_chan_name(host->dma_tx_channel); 269 else 270 txname = "none"; 271 272 dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n", 273 rxname, txname); 274 275 /* 276 * Limit the maximum segment size in any SG entry according to 277 * the parameters of the DMA engine device. 278 */ 279 if (host->dma_tx_channel) { 280 struct device *dev = host->dma_tx_channel->device->dev; 281 unsigned int max_seg_size = dma_get_max_seg_size(dev); 282 283 if (max_seg_size < host->mmc->max_seg_size) 284 host->mmc->max_seg_size = max_seg_size; 285 } 286 if (host->dma_rx_channel) { 287 struct device *dev = host->dma_rx_channel->device->dev; 288 unsigned int max_seg_size = dma_get_max_seg_size(dev); 289 290 if (max_seg_size < host->mmc->max_seg_size) 291 host->mmc->max_seg_size = max_seg_size; 292 } 293} 294 295/* 296 * This is used in __devinit or __devexit so inline it 297 * so it can be discarded. 298 */ 299static inline void mmci_dma_release(struct mmci_host *host) 300{ 301 struct mmci_platform_data *plat = host->plat; 302 303 if (host->dma_rx_channel) 304 dma_release_channel(host->dma_rx_channel); 305 if (host->dma_tx_channel && plat->dma_tx_param) 306 dma_release_channel(host->dma_tx_channel); 307 host->dma_rx_channel = host->dma_tx_channel = NULL; 308} 309 310static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) 311{ 312 struct dma_chan *chan = host->dma_current; 313 enum dma_data_direction dir; 314 u32 status; 315 int i; 316 317 /* Wait up to 1ms for the DMA to complete */ 318 for (i = 0; ; i++) { 319 status = readl(host->base + MMCISTATUS); 320 if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100) 321 break; 322 udelay(10); 323 } 324 325 /* 326 * Check to see whether we still have some data left in the FIFO - 327 * this catches DMA controllers which are unable to monitor the 328 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non- 329 * contiguous buffers. On TX, we'll get a FIFO underrun error. 330 */ 331 if (status & MCI_RXDATAAVLBLMASK) { 332 dmaengine_terminate_all(chan); 333 if (!data->error) 334 data->error = -EIO; 335 } 336 337 if (data->flags & MMC_DATA_WRITE) { 338 dir = DMA_TO_DEVICE; 339 } else { 340 dir = DMA_FROM_DEVICE; 341 } 342 343 if (!data->host_cookie) 344 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir); 345 346 /* 347 * Use of DMA with scatter-gather is impossible. 348 * Give up with DMA and switch back to PIO mode. 349 */ 350 if (status & MCI_RXDATAAVLBLMASK) { 351 dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n"); 352 mmci_dma_release(host); 353 } 354} 355 356static void mmci_dma_data_error(struct mmci_host *host) 357{ 358 dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n"); 359 dmaengine_terminate_all(host->dma_current); 360} 361 362static int mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data, 363 struct mmci_host_next *next) 364{ 365 struct variant_data *variant = host->variant; 366 struct dma_slave_config conf = { 367 .src_addr = host->phybase + MMCIFIFO, 368 .dst_addr = host->phybase + MMCIFIFO, 369 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 370 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 371 .src_maxburst = variant->fifohalfsize >> 2, /* # of words */ 372 .dst_maxburst = variant->fifohalfsize >> 2, /* # of words */ 373 }; 374 struct dma_chan *chan; 375 struct dma_device *device; 376 struct dma_async_tx_descriptor *desc; 377 int nr_sg; 378 379 /* Check if next job is already prepared */ 380 if (data->host_cookie && !next && 381 host->dma_current && host->dma_desc_current) 382 return 0; 383 384 if (!next) { 385 host->dma_current = NULL; 386 host->dma_desc_current = NULL; 387 } 388 389 if (data->flags & MMC_DATA_READ) { 390 conf.direction = DMA_FROM_DEVICE; 391 chan = host->dma_rx_channel; 392 } else { 393 conf.direction = DMA_TO_DEVICE; 394 chan = host->dma_tx_channel; 395 } 396 397 /* If there's no DMA channel, fall back to PIO */ 398 if (!chan) 399 return -EINVAL; 400 401 /* If less than or equal to the fifo size, don't bother with DMA */ 402 if (data->blksz * data->blocks <= variant->fifosize) 403 return -EINVAL; 404 405 device = chan->device; 406 nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, conf.direction); 407 if (nr_sg == 0) 408 return -EINVAL; 409 410 dmaengine_slave_config(chan, &conf); 411 desc = device->device_prep_slave_sg(chan, data->sg, nr_sg, 412 conf.direction, DMA_CTRL_ACK); 413 if (!desc) 414 goto unmap_exit; 415 416 if (next) { 417 next->dma_chan = chan; 418 next->dma_desc = desc; 419 } else { 420 host->dma_current = chan; 421 host->dma_desc_current = desc; 422 } 423 424 return 0; 425 426 unmap_exit: 427 if (!next) 428 dmaengine_terminate_all(chan); 429 dma_unmap_sg(device->dev, data->sg, data->sg_len, conf.direction); 430 return -ENOMEM; 431} 432 433static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl) 434{ 435 int ret; 436 struct mmc_data *data = host->data; 437 438 ret = mmci_dma_prep_data(host, host->data, NULL); 439 if (ret) 440 return ret; 441 442 /* Okay, go for it. */ 443 dev_vdbg(mmc_dev(host->mmc), 444 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n", 445 data->sg_len, data->blksz, data->blocks, data->flags); 446 dmaengine_submit(host->dma_desc_current); 447 dma_async_issue_pending(host->dma_current); 448 449 datactrl |= MCI_DPSM_DMAENABLE; 450 451 /* Trigger the DMA transfer */ 452 writel(datactrl, host->base + MMCIDATACTRL); 453 454 /* 455 * Let the MMCI say when the data is ended and it's time 456 * to fire next DMA request. When that happens, MMCI will 457 * call mmci_data_end() 458 */ 459 writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK, 460 host->base + MMCIMASK0); 461 return 0; 462} 463 464static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) 465{ 466 struct mmci_host_next *next = &host->next_data; 467 468 if (data->host_cookie && data->host_cookie != next->cookie) { 469 pr_warning("[%s] invalid cookie: data->host_cookie %d" 470 " host->next_data.cookie %d\n", 471 __func__, data->host_cookie, host->next_data.cookie); 472 data->host_cookie = 0; 473 } 474 475 if (!data->host_cookie) 476 return; 477 478 host->dma_desc_current = next->dma_desc; 479 host->dma_current = next->dma_chan; 480 481 next->dma_desc = NULL; 482 next->dma_chan = NULL; 483} 484 485static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq, 486 bool is_first_req) 487{ 488 struct mmci_host *host = mmc_priv(mmc); 489 struct mmc_data *data = mrq->data; 490 struct mmci_host_next *nd = &host->next_data; 491 492 if (!data) 493 return; 494 495 if (data->host_cookie) { 496 data->host_cookie = 0; 497 return; 498 } 499 500 /* if config for dma */ 501 if (((data->flags & MMC_DATA_WRITE) && host->dma_tx_channel) || 502 ((data->flags & MMC_DATA_READ) && host->dma_rx_channel)) { 503 if (mmci_dma_prep_data(host, data, nd)) 504 data->host_cookie = 0; 505 else 506 data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie; 507 } 508} 509 510static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq, 511 int err) 512{ 513 struct mmci_host *host = mmc_priv(mmc); 514 struct mmc_data *data = mrq->data; 515 struct dma_chan *chan; 516 enum dma_data_direction dir; 517 518 if (!data) 519 return; 520 521 if (data->flags & MMC_DATA_READ) { 522 dir = DMA_FROM_DEVICE; 523 chan = host->dma_rx_channel; 524 } else { 525 dir = DMA_TO_DEVICE; 526 chan = host->dma_tx_channel; 527 } 528 529 530 /* if config for dma */ 531 if (chan) { 532 if (err) 533 dmaengine_terminate_all(chan); 534 if (data->host_cookie) 535 dma_unmap_sg(mmc_dev(host->mmc), data->sg, 536 data->sg_len, dir); 537 mrq->data->host_cookie = 0; 538 } 539} 540 541#else 542/* Blank functions if the DMA engine is not available */ 543static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data) 544{ 545} 546static inline void mmci_dma_setup(struct mmci_host *host) 547{ 548} 549 550static inline void mmci_dma_release(struct mmci_host *host) 551{ 552} 553 554static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data) 555{ 556} 557 558static inline void mmci_dma_data_error(struct mmci_host *host) 559{ 560} 561 562static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl) 563{ 564 return -ENOSYS; 565} 566 567#define mmci_pre_request NULL 568#define mmci_post_request NULL 569 570#endif 571 572static void mmci_start_data(struct mmci_host *host, struct mmc_data *data) 573{ 574 struct variant_data *variant = host->variant; 575 unsigned int datactrl, timeout, irqmask; 576 unsigned long long clks; 577 void __iomem *base; 578 int blksz_bits; 579 580 dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n", 581 data->blksz, data->blocks, data->flags); 582 583 host->data = data; 584 host->size = data->blksz * data->blocks; 585 data->bytes_xfered = 0; 586 587 clks = (unsigned long long)data->timeout_ns * host->cclk; 588 do_div(clks, 1000000000UL); 589 590 timeout = data->timeout_clks + (unsigned int)clks; 591 592 base = host->base; 593 writel(timeout, base + MMCIDATATIMER); 594 writel(host->size, base + MMCIDATALENGTH); 595 596 blksz_bits = ffs(data->blksz) - 1; 597 BUG_ON(1 << blksz_bits != data->blksz); 598 599 if (variant->blksz_datactrl16) 600 datactrl = MCI_DPSM_ENABLE | (data->blksz << 16); 601 else 602 datactrl = MCI_DPSM_ENABLE | blksz_bits << 4; 603 604 if (data->flags & MMC_DATA_READ) 605 datactrl |= MCI_DPSM_DIRECTION; 606 607 /* 608 * Attempt to use DMA operation mode, if this 609 * should fail, fall back to PIO mode 610 */ 611 if (!mmci_dma_start_data(host, datactrl)) 612 return; 613 614 /* IRQ mode, map the SG list for CPU reading/writing */ 615 mmci_init_sg(host, data); 616 617 if (data->flags & MMC_DATA_READ) { 618 irqmask = MCI_RXFIFOHALFFULLMASK; 619 620 /* 621 * If we have less than the fifo 'half-full' threshold to 622 * transfer, trigger a PIO interrupt as soon as any data 623 * is available. 624 */ 625 if (host->size < variant->fifohalfsize) 626 irqmask |= MCI_RXDATAAVLBLMASK; 627 } else { 628 /* 629 * We don't actually need to include "FIFO empty" here 630 * since its implicit in "FIFO half empty". 631 */ 632 irqmask = MCI_TXFIFOHALFEMPTYMASK; 633 } 634 635 /* The ST Micro variants has a special bit to enable SDIO */ 636 if (variant->sdio && host->mmc->card) 637 if (mmc_card_sdio(host->mmc->card)) 638 datactrl |= MCI_ST_DPSM_SDIOEN; 639 640 writel(datactrl, base + MMCIDATACTRL); 641 writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0); 642 mmci_set_mask1(host, irqmask); 643} 644 645static void 646mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c) 647{ 648 void __iomem *base = host->base; 649 650 dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n", 651 cmd->opcode, cmd->arg, cmd->flags); 652 653 if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) { 654 writel(0, base + MMCICOMMAND); 655 udelay(1); 656 } 657 658 c |= cmd->opcode | MCI_CPSM_ENABLE; 659 if (cmd->flags & MMC_RSP_PRESENT) { 660 if (cmd->flags & MMC_RSP_136) 661 c |= MCI_CPSM_LONGRSP; 662 c |= MCI_CPSM_RESPONSE; 663 } 664 if (/*interrupt*/0) 665 c |= MCI_CPSM_INTERRUPT; 666 667 host->cmd = cmd; 668 669 writel(cmd->arg, base + MMCIARGUMENT); 670 writel(c, base + MMCICOMMAND); 671} 672 673static void 674mmci_data_irq(struct mmci_host *host, struct mmc_data *data, 675 unsigned int status) 676{ 677 /* First check for errors */ 678 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR| 679 MCI_TXUNDERRUN|MCI_RXOVERRUN)) { 680 u32 remain, success; 681 682 /* Terminate the DMA transfer */ 683 if (dma_inprogress(host)) 684 mmci_dma_data_error(host); 685 686 /* 687 * Calculate how far we are into the transfer. Note that 688 * the data counter gives the number of bytes transferred 689 * on the MMC bus, not on the host side. On reads, this 690 * can be as much as a FIFO-worth of data ahead. This 691 * matters for FIFO overruns only. 692 */ 693 remain = readl(host->base + MMCIDATACNT); 694 success = data->blksz * data->blocks - remain; 695 696 dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n", 697 status, success); 698 if (status & MCI_DATACRCFAIL) { 699 /* Last block was not successful */ 700 success -= 1; 701 data->error = -EILSEQ; 702 } else if (status & MCI_DATATIMEOUT) { 703 data->error = -ETIMEDOUT; 704 } else if (status & MCI_STARTBITERR) { 705 data->error = -ECOMM; 706 } else if (status & MCI_TXUNDERRUN) { 707 data->error = -EIO; 708 } else if (status & MCI_RXOVERRUN) { 709 if (success > host->variant->fifosize) 710 success -= host->variant->fifosize; 711 else 712 success = 0; 713 data->error = -EIO; 714 } 715 data->bytes_xfered = round_down(success, data->blksz); 716 } 717 718 if (status & MCI_DATABLOCKEND) 719 dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n"); 720 721 if (status & MCI_DATAEND || data->error) { 722 if (dma_inprogress(host)) 723 mmci_dma_unmap(host, data); 724 mmci_stop_data(host); 725 726 if (!data->error) 727 /* The error clause is handled above, success! */ 728 data->bytes_xfered = data->blksz * data->blocks; 729 730 if (!data->stop) { 731 mmci_request_end(host, data->mrq); 732 } else { 733 mmci_start_command(host, data->stop, 0); 734 } 735 } 736} 737 738static void 739mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd, 740 unsigned int status) 741{ 742 void __iomem *base = host->base; 743 744 host->cmd = NULL; 745 746 if (status & MCI_CMDTIMEOUT) { 747 cmd->error = -ETIMEDOUT; 748 } else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) { 749 cmd->error = -EILSEQ; 750 } else { 751 cmd->resp[0] = readl(base + MMCIRESPONSE0); 752 cmd->resp[1] = readl(base + MMCIRESPONSE1); 753 cmd->resp[2] = readl(base + MMCIRESPONSE2); 754 cmd->resp[3] = readl(base + MMCIRESPONSE3); 755 } 756 757 if (!cmd->data || cmd->error) { 758 if (host->data) { 759 /* Terminate the DMA transfer */ 760 if (dma_inprogress(host)) 761 mmci_dma_data_error(host); 762 mmci_stop_data(host); 763 } 764 mmci_request_end(host, cmd->mrq); 765 } else if (!(cmd->data->flags & MMC_DATA_READ)) { 766 mmci_start_data(host, cmd->data); 767 } 768} 769 770static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain) 771{ 772 void __iomem *base = host->base; 773 char *ptr = buffer; 774 u32 status; 775 int host_remain = host->size; 776 777 do { 778 int count = host_remain - (readl(base + MMCIFIFOCNT) << 2); 779 780 if (count > remain) 781 count = remain; 782 783 if (count <= 0) 784 break; 785 786 readsl(base + MMCIFIFO, ptr, count >> 2); 787 788 ptr += count; 789 remain -= count; 790 host_remain -= count; 791 792 if (remain == 0) 793 break; 794 795 status = readl(base + MMCISTATUS); 796 } while (status & MCI_RXDATAAVLBL); 797 798 return ptr - buffer; 799} 800 801static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status) 802{ 803 struct variant_data *variant = host->variant; 804 void __iomem *base = host->base; 805 char *ptr = buffer; 806 807 do { 808 unsigned int count, maxcnt; 809 810 maxcnt = status & MCI_TXFIFOEMPTY ? 811 variant->fifosize : variant->fifohalfsize; 812 count = min(remain, maxcnt); 813 814 /* 815 * The ST Micro variant for SDIO transfer sizes 816 * less then 8 bytes should have clock H/W flow 817 * control disabled. 818 */ 819 if (variant->sdio && 820 mmc_card_sdio(host->mmc->card)) { 821 if (count < 8) 822 writel(readl(host->base + MMCICLOCK) & 823 ~variant->clkreg_enable, 824 host->base + MMCICLOCK); 825 else 826 writel(readl(host->base + MMCICLOCK) | 827 variant->clkreg_enable, 828 host->base + MMCICLOCK); 829 } 830 831 /* 832 * SDIO especially may want to send something that is 833 * not divisible by 4 (as opposed to card sectors 834 * etc), and the FIFO only accept full 32-bit writes. 835 * So compensate by adding +3 on the count, a single 836 * byte become a 32bit write, 7 bytes will be two 837 * 32bit writes etc. 838 */ 839 writesl(base + MMCIFIFO, ptr, (count + 3) >> 2); 840 841 ptr += count; 842 remain -= count; 843 844 if (remain == 0) 845 break; 846 847 status = readl(base + MMCISTATUS); 848 } while (status & MCI_TXFIFOHALFEMPTY); 849 850 return ptr - buffer; 851} 852 853/* 854 * PIO data transfer IRQ handler. 855 */ 856static irqreturn_t mmci_pio_irq(int irq, void *dev_id) 857{ 858 struct mmci_host *host = dev_id; 859 struct sg_mapping_iter *sg_miter = &host->sg_miter; 860 struct variant_data *variant = host->variant; 861 void __iomem *base = host->base; 862 unsigned long flags; 863 u32 status; 864 865 status = readl(base + MMCISTATUS); 866 867 dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status); 868 869 local_irq_save(flags); 870 871 do { 872 unsigned int remain, len; 873 char *buffer; 874 875 /* 876 * For write, we only need to test the half-empty flag 877 * here - if the FIFO is completely empty, then by 878 * definition it is more than half empty. 879 * 880 * For read, check for data available. 881 */ 882 if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL))) 883 break; 884 885 if (!sg_miter_next(sg_miter)) 886 break; 887 888 buffer = sg_miter->addr; 889 remain = sg_miter->length; 890 891 len = 0; 892 if (status & MCI_RXACTIVE) 893 len = mmci_pio_read(host, buffer, remain); 894 if (status & MCI_TXACTIVE) 895 len = mmci_pio_write(host, buffer, remain, status); 896 897 sg_miter->consumed = len; 898 899 host->size -= len; 900 remain -= len; 901 902 if (remain) 903 break; 904 905 status = readl(base + MMCISTATUS); 906 } while (1); 907 908 sg_miter_stop(sg_miter); 909 910 local_irq_restore(flags); 911 912 /* 913 * If we have less than the fifo 'half-full' threshold to transfer, 914 * trigger a PIO interrupt as soon as any data is available. 915 */ 916 if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize) 917 mmci_set_mask1(host, MCI_RXDATAAVLBLMASK); 918 919 /* 920 * If we run out of data, disable the data IRQs; this 921 * prevents a race where the FIFO becomes empty before 922 * the chip itself has disabled the data path, and 923 * stops us racing with our data end IRQ. 924 */ 925 if (host->size == 0) { 926 mmci_set_mask1(host, 0); 927 writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0); 928 } 929 930 return IRQ_HANDLED; 931} 932 933/* 934 * Handle completion of command and data transfers. 935 */ 936static irqreturn_t mmci_irq(int irq, void *dev_id) 937{ 938 struct mmci_host *host = dev_id; 939 u32 status; 940 int ret = 0; 941 942 spin_lock(&host->lock); 943 944 do { 945 struct mmc_command *cmd; 946 struct mmc_data *data; 947 948 status = readl(host->base + MMCISTATUS); 949 950 if (host->singleirq) { 951 if (status & readl(host->base + MMCIMASK1)) 952 mmci_pio_irq(irq, dev_id); 953 954 status &= ~MCI_IRQ1MASK; 955 } 956 957 status &= readl(host->base + MMCIMASK0); 958 writel(status, host->base + MMCICLEAR); 959 960 dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status); 961 962 data = host->data; 963 if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR| 964 MCI_TXUNDERRUN|MCI_RXOVERRUN|MCI_DATAEND| 965 MCI_DATABLOCKEND) && data) 966 mmci_data_irq(host, data, status); 967 968 cmd = host->cmd; 969 if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd) 970 mmci_cmd_irq(host, cmd, status); 971 972 ret = 1; 973 } while (status); 974 975 spin_unlock(&host->lock); 976 977 return IRQ_RETVAL(ret); 978} 979 980static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq) 981{ 982 struct mmci_host *host = mmc_priv(mmc); 983 unsigned long flags; 984 985 WARN_ON(host->mrq != NULL); 986 987 if (mrq->data && !is_power_of_2(mrq->data->blksz)) { 988 dev_err(mmc_dev(mmc), "unsupported block size (%d bytes)\n", 989 mrq->data->blksz); 990 mrq->cmd->error = -EINVAL; 991 mmc_request_done(mmc, mrq); 992 return; 993 } 994 995 pm_runtime_get_sync(mmc_dev(mmc)); 996 997 spin_lock_irqsave(&host->lock, flags); 998 999 host->mrq = mrq; 1000 1001 if (mrq->data) 1002 mmci_get_next_data(host, mrq->data); 1003 1004 if (mrq->data && mrq->data->flags & MMC_DATA_READ) 1005 mmci_start_data(host, mrq->data); 1006 1007 mmci_start_command(host, mrq->cmd, 0); 1008 1009 spin_unlock_irqrestore(&host->lock, flags); 1010} 1011 1012static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1013{ 1014 struct mmci_host *host = mmc_priv(mmc); 1015 u32 pwr = 0; 1016 unsigned long flags; 1017 int ret; 1018 1019 switch (ios->power_mode) { 1020 case MMC_POWER_OFF: 1021 if (host->vcc) 1022 ret = mmc_regulator_set_ocr(mmc, host->vcc, 0); 1023 break; 1024 case MMC_POWER_UP: 1025 if (host->vcc) { 1026 ret = mmc_regulator_set_ocr(mmc, host->vcc, ios->vdd); 1027 if (ret) { 1028 dev_err(mmc_dev(mmc), "unable to set OCR\n"); 1029 /* 1030 * The .set_ios() function in the mmc_host_ops 1031 * struct return void, and failing to set the 1032 * power should be rare so we print an error 1033 * and return here. 1034 */ 1035 return; 1036 } 1037 } 1038 if (host->plat->vdd_handler) 1039 pwr |= host->plat->vdd_handler(mmc_dev(mmc), ios->vdd, 1040 ios->power_mode); 1041 /* The ST version does not have this, fall through to POWER_ON */ 1042 if (host->hw_designer != AMBA_VENDOR_ST) { 1043 pwr |= MCI_PWR_UP; 1044 break; 1045 } 1046 case MMC_POWER_ON: 1047 pwr |= MCI_PWR_ON; 1048 break; 1049 } 1050 1051 if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) { 1052 if (host->hw_designer != AMBA_VENDOR_ST) 1053 pwr |= MCI_ROD; 1054 else { 1055 /* 1056 * The ST Micro variant use the ROD bit for something 1057 * else and only has OD (Open Drain). 1058 */ 1059 pwr |= MCI_OD; 1060 } 1061 } 1062 1063 spin_lock_irqsave(&host->lock, flags); 1064 1065 mmci_set_clkreg(host, ios->clock); 1066 1067 if (host->pwr != pwr) { 1068 host->pwr = pwr; 1069 writel(pwr, host->base + MMCIPOWER); 1070 } 1071 1072 spin_unlock_irqrestore(&host->lock, flags); 1073} 1074 1075static int mmci_get_ro(struct mmc_host *mmc) 1076{ 1077 struct mmci_host *host = mmc_priv(mmc); 1078 1079 if (host->gpio_wp == -ENOSYS) 1080 return -ENOSYS; 1081 1082 return gpio_get_value_cansleep(host->gpio_wp); 1083} 1084 1085static int mmci_get_cd(struct mmc_host *mmc) 1086{ 1087 struct mmci_host *host = mmc_priv(mmc); 1088 struct mmci_platform_data *plat = host->plat; 1089 unsigned int status; 1090 1091 if (host->gpio_cd == -ENOSYS) { 1092 if (!plat->status) 1093 return 1; /* Assume always present */ 1094 1095 status = plat->status(mmc_dev(host->mmc)); 1096 } else 1097 status = !!gpio_get_value_cansleep(host->gpio_cd) 1098 ^ plat->cd_invert; 1099 1100 /* 1101 * Use positive logic throughout - status is zero for no card, 1102 * non-zero for card inserted. 1103 */ 1104 return status; 1105} 1106 1107static irqreturn_t mmci_cd_irq(int irq, void *dev_id) 1108{ 1109 struct mmci_host *host = dev_id; 1110 1111 mmc_detect_change(host->mmc, msecs_to_jiffies(500)); 1112 1113 return IRQ_HANDLED; 1114} 1115 1116static const struct mmc_host_ops mmci_ops = { 1117 .request = mmci_request, 1118 .pre_req = mmci_pre_request, 1119 .post_req = mmci_post_request, 1120 .set_ios = mmci_set_ios, 1121 .get_ro = mmci_get_ro, 1122 .get_cd = mmci_get_cd, 1123}; 1124 1125static int __devinit mmci_probe(struct amba_device *dev, 1126 const struct amba_id *id) 1127{ 1128 struct mmci_platform_data *plat = dev->dev.platform_data; 1129 struct variant_data *variant = id->data; 1130 struct mmci_host *host; 1131 struct mmc_host *mmc; 1132 int ret; 1133 1134 /* must have platform data */ 1135 if (!plat) { 1136 ret = -EINVAL; 1137 goto out; 1138 } 1139 1140 ret = amba_request_regions(dev, DRIVER_NAME); 1141 if (ret) 1142 goto out; 1143 1144 mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev); 1145 if (!mmc) { 1146 ret = -ENOMEM; 1147 goto rel_regions; 1148 } 1149 1150 host = mmc_priv(mmc); 1151 host->mmc = mmc; 1152 1153 host->gpio_wp = -ENOSYS; 1154 host->gpio_cd = -ENOSYS; 1155 host->gpio_cd_irq = -1; 1156 1157 host->hw_designer = amba_manf(dev); 1158 host->hw_revision = amba_rev(dev); 1159 dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer); 1160 dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision); 1161 1162 host->clk = clk_get(&dev->dev, NULL); 1163 if (IS_ERR(host->clk)) { 1164 ret = PTR_ERR(host->clk); 1165 host->clk = NULL; 1166 goto host_free; 1167 } 1168 1169 ret = clk_prepare(host->clk); 1170 if (ret) 1171 goto clk_free; 1172 1173 ret = clk_enable(host->clk); 1174 if (ret) 1175 goto clk_unprep; 1176 1177 host->plat = plat; 1178 host->variant = variant; 1179 host->mclk = clk_get_rate(host->clk); 1180 /* 1181 * According to the spec, mclk is max 100 MHz, 1182 * so we try to adjust the clock down to this, 1183 * (if possible). 1184 */ 1185 if (host->mclk > 100000000) { 1186 ret = clk_set_rate(host->clk, 100000000); 1187 if (ret < 0) 1188 goto clk_disable; 1189 host->mclk = clk_get_rate(host->clk); 1190 dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n", 1191 host->mclk); 1192 } 1193 host->phybase = dev->res.start; 1194 host->base = ioremap(dev->res.start, resource_size(&dev->res)); 1195 if (!host->base) { 1196 ret = -ENOMEM; 1197 goto clk_disable; 1198 } 1199 1200 mmc->ops = &mmci_ops; 1201 /* 1202 * The ARM and ST versions of the block have slightly different 1203 * clock divider equations which means that the minimum divider 1204 * differs too. 1205 */ 1206 if (variant->st_clkdiv) 1207 mmc->f_min = DIV_ROUND_UP(host->mclk, 257); 1208 else 1209 mmc->f_min = DIV_ROUND_UP(host->mclk, 512); 1210 /* 1211 * If the platform data supplies a maximum operating 1212 * frequency, this takes precedence. Else, we fall back 1213 * to using the module parameter, which has a (low) 1214 * default value in case it is not specified. Either 1215 * value must not exceed the clock rate into the block, 1216 * of course. 1217 */ 1218 if (plat->f_max) 1219 mmc->f_max = min(host->mclk, plat->f_max); 1220 else 1221 mmc->f_max = min(host->mclk, fmax); 1222 dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max); 1223 1224#ifdef CONFIG_REGULATOR 1225 /* If we're using the regulator framework, try to fetch a regulator */ 1226 host->vcc = regulator_get(&dev->dev, "vmmc"); 1227 if (IS_ERR(host->vcc)) 1228 host->vcc = NULL; 1229 else { 1230 int mask = mmc_regulator_get_ocrmask(host->vcc); 1231 1232 if (mask < 0) 1233 dev_err(&dev->dev, "error getting OCR mask (%d)\n", 1234 mask); 1235 else { 1236 host->mmc->ocr_avail = (u32) mask; 1237 if (plat->ocr_mask) 1238 dev_warn(&dev->dev, 1239 "Provided ocr_mask/setpower will not be used " 1240 "(using regulator instead)\n"); 1241 } 1242 } 1243#endif 1244 /* Fall back to platform data if no regulator is found */ 1245 if (host->vcc == NULL) 1246 mmc->ocr_avail = plat->ocr_mask; 1247 mmc->caps = plat->capabilities; 1248 1249 /* 1250 * We can do SGIO 1251 */ 1252 mmc->max_segs = NR_SG; 1253 1254 /* 1255 * Since only a certain number of bits are valid in the data length 1256 * register, we must ensure that we don't exceed 2^num-1 bytes in a 1257 * single request. 1258 */ 1259 mmc->max_req_size = (1 << variant->datalength_bits) - 1; 1260 1261 /* 1262 * Set the maximum segment size. Since we aren't doing DMA 1263 * (yet) we are only limited by the data length register. 1264 */ 1265 mmc->max_seg_size = mmc->max_req_size; 1266 1267 /* 1268 * Block size can be up to 2048 bytes, but must be a power of two. 1269 */ 1270 mmc->max_blk_size = 2048; 1271 1272 /* 1273 * No limit on the number of blocks transferred. 1274 */ 1275 mmc->max_blk_count = mmc->max_req_size; 1276 1277 spin_lock_init(&host->lock); 1278 1279 writel(0, host->base + MMCIMASK0); 1280 writel(0, host->base + MMCIMASK1); 1281 writel(0xfff, host->base + MMCICLEAR); 1282 1283 if (gpio_is_valid(plat->gpio_cd)) { 1284 ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)"); 1285 if (ret == 0) 1286 ret = gpio_direction_input(plat->gpio_cd); 1287 if (ret == 0) 1288 host->gpio_cd = plat->gpio_cd; 1289 else if (ret != -ENOSYS) 1290 goto err_gpio_cd; 1291 1292 /* 1293 * A gpio pin that will detect cards when inserted and removed 1294 * will most likely want to trigger on the edges if it is 1295 * 0 when ejected and 1 when inserted (or mutatis mutandis 1296 * for the inverted case) so we request triggers on both 1297 * edges. 1298 */ 1299 ret = request_any_context_irq(gpio_to_irq(plat->gpio_cd), 1300 mmci_cd_irq, 1301 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, 1302 DRIVER_NAME " (cd)", host); 1303 if (ret >= 0) 1304 host->gpio_cd_irq = gpio_to_irq(plat->gpio_cd); 1305 } 1306 if (gpio_is_valid(plat->gpio_wp)) { 1307 ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)"); 1308 if (ret == 0) 1309 ret = gpio_direction_input(plat->gpio_wp); 1310 if (ret == 0) 1311 host->gpio_wp = plat->gpio_wp; 1312 else if (ret != -ENOSYS) 1313 goto err_gpio_wp; 1314 } 1315 1316 if ((host->plat->status || host->gpio_cd != -ENOSYS) 1317 && host->gpio_cd_irq < 0) 1318 mmc->caps |= MMC_CAP_NEEDS_POLL; 1319 1320 ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host); 1321 if (ret) 1322 goto unmap; 1323 1324 if (dev->irq[1] == NO_IRQ) 1325 host->singleirq = true; 1326 else { 1327 ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, 1328 DRIVER_NAME " (pio)", host); 1329 if (ret) 1330 goto irq0_free; 1331 } 1332 1333 writel(MCI_IRQENABLE, host->base + MMCIMASK0); 1334 1335 amba_set_drvdata(dev, mmc); 1336 1337 dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n", 1338 mmc_hostname(mmc), amba_part(dev), amba_manf(dev), 1339 amba_rev(dev), (unsigned long long)dev->res.start, 1340 dev->irq[0], dev->irq[1]); 1341 1342 mmci_dma_setup(host); 1343 1344 pm_runtime_put(&dev->dev); 1345 1346 mmc_add_host(mmc); 1347 1348 return 0; 1349 1350 irq0_free: 1351 free_irq(dev->irq[0], host); 1352 unmap: 1353 if (host->gpio_wp != -ENOSYS) 1354 gpio_free(host->gpio_wp); 1355 err_gpio_wp: 1356 if (host->gpio_cd_irq >= 0) 1357 free_irq(host->gpio_cd_irq, host); 1358 if (host->gpio_cd != -ENOSYS) 1359 gpio_free(host->gpio_cd); 1360 err_gpio_cd: 1361 iounmap(host->base); 1362 clk_disable: 1363 clk_disable(host->clk); 1364 clk_unprep: 1365 clk_unprepare(host->clk); 1366 clk_free: 1367 clk_put(host->clk); 1368 host_free: 1369 mmc_free_host(mmc); 1370 rel_regions: 1371 amba_release_regions(dev); 1372 out: 1373 return ret; 1374} 1375 1376static int __devexit mmci_remove(struct amba_device *dev) 1377{ 1378 struct mmc_host *mmc = amba_get_drvdata(dev); 1379 1380 amba_set_drvdata(dev, NULL); 1381 1382 if (mmc) { 1383 struct mmci_host *host = mmc_priv(mmc); 1384 1385 /* 1386 * Undo pm_runtime_put() in probe. We use the _sync 1387 * version here so that we can access the primecell. 1388 */ 1389 pm_runtime_get_sync(&dev->dev); 1390 1391 mmc_remove_host(mmc); 1392 1393 writel(0, host->base + MMCIMASK0); 1394 writel(0, host->base + MMCIMASK1); 1395 1396 writel(0, host->base + MMCICOMMAND); 1397 writel(0, host->base + MMCIDATACTRL); 1398 1399 mmci_dma_release(host); 1400 free_irq(dev->irq[0], host); 1401 if (!host->singleirq) 1402 free_irq(dev->irq[1], host); 1403 1404 if (host->gpio_wp != -ENOSYS) 1405 gpio_free(host->gpio_wp); 1406 if (host->gpio_cd_irq >= 0) 1407 free_irq(host->gpio_cd_irq, host); 1408 if (host->gpio_cd != -ENOSYS) 1409 gpio_free(host->gpio_cd); 1410 1411 iounmap(host->base); 1412 clk_disable(host->clk); 1413 clk_unprepare(host->clk); 1414 clk_put(host->clk); 1415 1416 if (host->vcc) 1417 mmc_regulator_set_ocr(mmc, host->vcc, 0); 1418 regulator_put(host->vcc); 1419 1420 mmc_free_host(mmc); 1421 1422 amba_release_regions(dev); 1423 } 1424 1425 return 0; 1426} 1427 1428#ifdef CONFIG_PM 1429static int mmci_suspend(struct amba_device *dev, pm_message_t state) 1430{ 1431 struct mmc_host *mmc = amba_get_drvdata(dev); 1432 int ret = 0; 1433 1434 if (mmc) { 1435 struct mmci_host *host = mmc_priv(mmc); 1436 1437 ret = mmc_suspend_host(mmc); 1438 if (ret == 0) 1439 writel(0, host->base + MMCIMASK0); 1440 } 1441 1442 return ret; 1443} 1444 1445static int mmci_resume(struct amba_device *dev) 1446{ 1447 struct mmc_host *mmc = amba_get_drvdata(dev); 1448 int ret = 0; 1449 1450 if (mmc) { 1451 struct mmci_host *host = mmc_priv(mmc); 1452 1453 writel(MCI_IRQENABLE, host->base + MMCIMASK0); 1454 1455 ret = mmc_resume_host(mmc); 1456 } 1457 1458 return ret; 1459} 1460#else 1461#define mmci_suspend NULL 1462#define mmci_resume NULL 1463#endif 1464 1465static struct amba_id mmci_ids[] = { 1466 { 1467 .id = 0x00041180, 1468 .mask = 0xff0fffff, 1469 .data = &variant_arm, 1470 }, 1471 { 1472 .id = 0x01041180, 1473 .mask = 0xff0fffff, 1474 .data = &variant_arm_extended_fifo, 1475 }, 1476 { 1477 .id = 0x00041181, 1478 .mask = 0x000fffff, 1479 .data = &variant_arm, 1480 }, 1481 /* ST Micro variants */ 1482 { 1483 .id = 0x00180180, 1484 .mask = 0x00ffffff, 1485 .data = &variant_u300, 1486 }, 1487 { 1488 .id = 0x00280180, 1489 .mask = 0x00ffffff, 1490 .data = &variant_u300, 1491 }, 1492 { 1493 .id = 0x00480180, 1494 .mask = 0xf0ffffff, 1495 .data = &variant_ux500, 1496 }, 1497 { 1498 .id = 0x10480180, 1499 .mask = 0xf0ffffff, 1500 .data = &variant_ux500v2, 1501 }, 1502 { 0, 0 }, 1503}; 1504 1505static struct amba_driver mmci_driver = { 1506 .drv = { 1507 .name = DRIVER_NAME, 1508 }, 1509 .probe = mmci_probe, 1510 .remove = __devexit_p(mmci_remove), 1511 .suspend = mmci_suspend, 1512 .resume = mmci_resume, 1513 .id_table = mmci_ids, 1514}; 1515 1516static int __init mmci_init(void) 1517{ 1518 return amba_driver_register(&mmci_driver); 1519} 1520 1521static void __exit mmci_exit(void) 1522{ 1523 amba_driver_unregister(&mmci_driver); 1524} 1525 1526module_init(mmci_init); 1527module_exit(mmci_exit); 1528module_param(fmax, uint, 0444); 1529 1530MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver"); 1531MODULE_LICENSE("GPL"); 1532