1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. 4 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> 5 */ 6 7#include <linux/clk.h> 8#include <linux/delay.h> 9#include <linux/device.h> 10#include <linux/dma-mapping.h> 11#include <linux/dmaengine.h> 12#include <linux/highmem.h> 13#include <linux/interrupt.h> 14#include <linux/io.h> 15#include <linux/log2.h> 16#include <linux/mmc/host.h> 17#include <linux/mmc/mmc.h> 18#include <linux/mmc/sd.h> 19#include <linux/mmc/sdio.h> 20#include <linux/module.h> 21#include <linux/pagemap.h> 22#include <linux/pinctrl/consumer.h> 23#include <linux/platform_device.h> 24#include <linux/scatterlist.h> 25#include <linux/string.h> 26#include <linux/time.h> 27#include <linux/virtio.h> 28#include <linux/workqueue.h> 29 30#define USDHI6_SD_CMD 0x0000 31#define USDHI6_SD_PORT_SEL 0x0004 32#define USDHI6_SD_ARG 0x0008 33#define USDHI6_SD_STOP 0x0010 34#define USDHI6_SD_SECCNT 0x0014 35#define USDHI6_SD_RSP10 0x0018 36#define USDHI6_SD_RSP32 0x0020 37#define USDHI6_SD_RSP54 0x0028 38#define USDHI6_SD_RSP76 0x0030 39#define USDHI6_SD_INFO1 0x0038 40#define USDHI6_SD_INFO2 0x003c 41#define USDHI6_SD_INFO1_MASK 0x0040 42#define USDHI6_SD_INFO2_MASK 0x0044 43#define USDHI6_SD_CLK_CTRL 0x0048 44#define USDHI6_SD_SIZE 0x004c 45#define USDHI6_SD_OPTION 0x0050 46#define USDHI6_SD_ERR_STS1 0x0058 47#define USDHI6_SD_ERR_STS2 0x005c 48#define USDHI6_SD_BUF0 0x0060 49#define USDHI6_SDIO_MODE 0x0068 50#define USDHI6_SDIO_INFO1 0x006c 51#define USDHI6_SDIO_INFO1_MASK 0x0070 52#define USDHI6_CC_EXT_MODE 0x01b0 53#define USDHI6_SOFT_RST 0x01c0 54#define USDHI6_VERSION 0x01c4 55#define USDHI6_HOST_MODE 0x01c8 56#define USDHI6_SDIF_MODE 0x01cc 57 58#define USDHI6_SD_CMD_APP 0x0040 59#define USDHI6_SD_CMD_MODE_RSP_AUTO 0x0000 60#define USDHI6_SD_CMD_MODE_RSP_NONE 0x0300 61#define USDHI6_SD_CMD_MODE_RSP_R1 0x0400 /* Also R5, R6, R7 */ 62#define USDHI6_SD_CMD_MODE_RSP_R1B 0x0500 /* R1b */ 63#define USDHI6_SD_CMD_MODE_RSP_R2 0x0600 64#define USDHI6_SD_CMD_MODE_RSP_R3 0x0700 /* Also R4 */ 65#define USDHI6_SD_CMD_DATA 0x0800 66#define USDHI6_SD_CMD_READ 0x1000 67#define USDHI6_SD_CMD_MULTI 0x2000 68#define USDHI6_SD_CMD_CMD12_AUTO_OFF 0x4000 69 70#define USDHI6_CC_EXT_MODE_SDRW BIT(1) 71 72#define USDHI6_SD_INFO1_RSP_END BIT(0) 73#define USDHI6_SD_INFO1_ACCESS_END BIT(2) 74#define USDHI6_SD_INFO1_CARD_OUT BIT(3) 75#define USDHI6_SD_INFO1_CARD_IN BIT(4) 76#define USDHI6_SD_INFO1_CD BIT(5) 77#define USDHI6_SD_INFO1_WP BIT(7) 78#define USDHI6_SD_INFO1_D3_CARD_OUT BIT(8) 79#define USDHI6_SD_INFO1_D3_CARD_IN BIT(9) 80 81#define USDHI6_SD_INFO2_CMD_ERR BIT(0) 82#define USDHI6_SD_INFO2_CRC_ERR BIT(1) 83#define USDHI6_SD_INFO2_END_ERR BIT(2) 84#define USDHI6_SD_INFO2_TOUT BIT(3) 85#define USDHI6_SD_INFO2_IWA_ERR BIT(4) 86#define USDHI6_SD_INFO2_IRA_ERR BIT(5) 87#define USDHI6_SD_INFO2_RSP_TOUT BIT(6) 88#define USDHI6_SD_INFO2_SDDAT0 BIT(7) 89#define USDHI6_SD_INFO2_BRE BIT(8) 90#define USDHI6_SD_INFO2_BWE BIT(9) 91#define USDHI6_SD_INFO2_SCLKDIVEN BIT(13) 92#define USDHI6_SD_INFO2_CBSY BIT(14) 93#define USDHI6_SD_INFO2_ILA BIT(15) 94 95#define USDHI6_SD_INFO1_CARD_INSERT (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_D3_CARD_IN) 96#define USDHI6_SD_INFO1_CARD_EJECT (USDHI6_SD_INFO1_CARD_OUT | USDHI6_SD_INFO1_D3_CARD_OUT) 97#define USDHI6_SD_INFO1_CARD (USDHI6_SD_INFO1_CARD_INSERT | USDHI6_SD_INFO1_CARD_EJECT) 98#define USDHI6_SD_INFO1_CARD_CD (USDHI6_SD_INFO1_CARD_IN | USDHI6_SD_INFO1_CARD_OUT) 99 100#define USDHI6_SD_INFO2_ERR (USDHI6_SD_INFO2_CMD_ERR | \ 101 USDHI6_SD_INFO2_CRC_ERR | USDHI6_SD_INFO2_END_ERR | \ 102 USDHI6_SD_INFO2_TOUT | USDHI6_SD_INFO2_IWA_ERR | \ 103 USDHI6_SD_INFO2_IRA_ERR | USDHI6_SD_INFO2_RSP_TOUT | \ 104 USDHI6_SD_INFO2_ILA) 105 106#define USDHI6_SD_INFO1_IRQ (USDHI6_SD_INFO1_RSP_END | USDHI6_SD_INFO1_ACCESS_END | \ 107 USDHI6_SD_INFO1_CARD) 108 109#define USDHI6_SD_INFO2_IRQ (USDHI6_SD_INFO2_ERR | USDHI6_SD_INFO2_BRE | \ 110 USDHI6_SD_INFO2_BWE | 0x0800 | USDHI6_SD_INFO2_ILA) 111 112#define USDHI6_SD_CLK_CTRL_SCLKEN BIT(8) 113 114#define USDHI6_SD_STOP_STP BIT(0) 115#define USDHI6_SD_STOP_SEC BIT(8) 116 117#define USDHI6_SDIO_INFO1_IOIRQ BIT(0) 118#define USDHI6_SDIO_INFO1_EXPUB52 BIT(14) 119#define USDHI6_SDIO_INFO1_EXWT BIT(15) 120 121#define USDHI6_SD_ERR_STS1_CRC_NO_ERROR BIT(13) 122 123#define USDHI6_SOFT_RST_RESERVED (BIT(1) | BIT(2)) 124#define USDHI6_SOFT_RST_RESET BIT(0) 125 126#define USDHI6_SD_OPTION_TIMEOUT_SHIFT 4 127#define USDHI6_SD_OPTION_TIMEOUT_MASK (0xf << USDHI6_SD_OPTION_TIMEOUT_SHIFT) 128#define USDHI6_SD_OPTION_WIDTH_1 BIT(15) 129 130#define USDHI6_SD_PORT_SEL_PORTS_SHIFT 8 131 132#define USDHI6_SD_CLK_CTRL_DIV_MASK 0xff 133 134#define USDHI6_SDIO_INFO1_IRQ (USDHI6_SDIO_INFO1_IOIRQ | 3 | \ 135 USDHI6_SDIO_INFO1_EXPUB52 | USDHI6_SDIO_INFO1_EXWT) 136 137#define USDHI6_MIN_DMA 64 138 139#define USDHI6_REQ_TIMEOUT_MS 4000 140 141enum usdhi6_wait_for { 142 USDHI6_WAIT_FOR_REQUEST, 143 USDHI6_WAIT_FOR_CMD, 144 USDHI6_WAIT_FOR_MREAD, 145 USDHI6_WAIT_FOR_MWRITE, 146 USDHI6_WAIT_FOR_READ, 147 USDHI6_WAIT_FOR_WRITE, 148 USDHI6_WAIT_FOR_DATA_END, 149 USDHI6_WAIT_FOR_STOP, 150 USDHI6_WAIT_FOR_DMA, 151}; 152 153struct usdhi6_page { 154 struct page *page; 155 void *mapped; /* mapped page */ 156}; 157 158struct usdhi6_host { 159 struct mmc_host *mmc; 160 struct mmc_request *mrq; 161 void __iomem *base; 162 struct clk *clk; 163 164 /* SG memory handling */ 165 166 /* Common for multiple and single block requests */ 167 struct usdhi6_page pg; /* current page from an SG */ 168 void *blk_page; /* either a mapped page, or the bounce buffer */ 169 size_t offset; /* offset within a page, including sg->offset */ 170 171 /* Blocks, crossing a page boundary */ 172 size_t head_len; 173 struct usdhi6_page head_pg; 174 175 /* A bounce buffer for unaligned blocks or blocks, crossing a page boundary */ 176 struct scatterlist bounce_sg; 177 u8 bounce_buf[512]; 178 179 /* Multiple block requests only */ 180 struct scatterlist *sg; /* current SG segment */ 181 int page_idx; /* page index within an SG segment */ 182 183 enum usdhi6_wait_for wait; 184 u32 status_mask; 185 u32 status2_mask; 186 u32 sdio_mask; 187 u32 io_error; 188 u32 irq_status; 189 unsigned long imclk; 190 unsigned long rate; 191 bool app_cmd; 192 193 /* Timeout handling */ 194 struct delayed_work timeout_work; 195 unsigned long timeout; 196 197 /* DMA support */ 198 struct dma_chan *chan_rx; 199 struct dma_chan *chan_tx; 200 bool dma_active; 201 202 /* Pin control */ 203 struct pinctrl *pinctrl; 204 struct pinctrl_state *pins_uhs; 205}; 206 207/* I/O primitives */ 208 209static void usdhi6_write(struct usdhi6_host *host, u32 reg, u32 data) 210{ 211 iowrite32(data, host->base + reg); 212 dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, 213 host->base, reg, data); 214} 215 216static void usdhi6_write16(struct usdhi6_host *host, u32 reg, u16 data) 217{ 218 iowrite16(data, host->base + reg); 219 dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, 220 host->base, reg, data); 221} 222 223static u32 usdhi6_read(struct usdhi6_host *host, u32 reg) 224{ 225 u32 data = ioread32(host->base + reg); 226 dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, 227 host->base, reg, data); 228 return data; 229} 230 231static u16 usdhi6_read16(struct usdhi6_host *host, u32 reg) 232{ 233 u16 data = ioread16(host->base + reg); 234 dev_vdbg(mmc_dev(host->mmc), "%s(0x%p + 0x%x) = 0x%x\n", __func__, 235 host->base, reg, data); 236 return data; 237} 238 239static void usdhi6_irq_enable(struct usdhi6_host *host, u32 info1, u32 info2) 240{ 241 host->status_mask = USDHI6_SD_INFO1_IRQ & ~info1; 242 host->status2_mask = USDHI6_SD_INFO2_IRQ & ~info2; 243 usdhi6_write(host, USDHI6_SD_INFO1_MASK, host->status_mask); 244 usdhi6_write(host, USDHI6_SD_INFO2_MASK, host->status2_mask); 245} 246 247static void usdhi6_wait_for_resp(struct usdhi6_host *host) 248{ 249 usdhi6_irq_enable(host, USDHI6_SD_INFO1_RSP_END | 250 USDHI6_SD_INFO1_ACCESS_END | USDHI6_SD_INFO1_CARD_CD, 251 USDHI6_SD_INFO2_ERR); 252} 253 254static void usdhi6_wait_for_brwe(struct usdhi6_host *host, bool read) 255{ 256 usdhi6_irq_enable(host, USDHI6_SD_INFO1_ACCESS_END | 257 USDHI6_SD_INFO1_CARD_CD, USDHI6_SD_INFO2_ERR | 258 (read ? USDHI6_SD_INFO2_BRE : USDHI6_SD_INFO2_BWE)); 259} 260 261static void usdhi6_only_cd(struct usdhi6_host *host) 262{ 263 /* Mask all except card hotplug */ 264 usdhi6_irq_enable(host, USDHI6_SD_INFO1_CARD_CD, 0); 265} 266 267static void usdhi6_mask_all(struct usdhi6_host *host) 268{ 269 usdhi6_irq_enable(host, 0, 0); 270} 271 272static int usdhi6_error_code(struct usdhi6_host *host) 273{ 274 u32 err; 275 276 usdhi6_write(host, USDHI6_SD_STOP, USDHI6_SD_STOP_STP); 277 278 if (host->io_error & 279 (USDHI6_SD_INFO2_RSP_TOUT | USDHI6_SD_INFO2_TOUT)) { 280 u32 rsp54 = usdhi6_read(host, USDHI6_SD_RSP54); 281 int opc = host->mrq ? host->mrq->cmd->opcode : -1; 282 283 err = usdhi6_read(host, USDHI6_SD_ERR_STS2); 284 /* Response timeout is often normal, don't spam the log */ 285 if (host->wait == USDHI6_WAIT_FOR_CMD) 286 dev_dbg(mmc_dev(host->mmc), 287 "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", 288 err, rsp54, host->wait, opc); 289 else 290 dev_warn(mmc_dev(host->mmc), 291 "T-out sts 0x%x, resp 0x%x, state %u, CMD%d\n", 292 err, rsp54, host->wait, opc); 293 return -ETIMEDOUT; 294 } 295 296 err = usdhi6_read(host, USDHI6_SD_ERR_STS1); 297 if (err != USDHI6_SD_ERR_STS1_CRC_NO_ERROR) 298 dev_warn(mmc_dev(host->mmc), "Err sts 0x%x, state %u, CMD%d\n", 299 err, host->wait, host->mrq ? host->mrq->cmd->opcode : -1); 300 if (host->io_error & USDHI6_SD_INFO2_ILA) 301 return -EILSEQ; 302 303 return -EIO; 304} 305 306/* Scatter-Gather management */ 307 308/* 309 * In PIO mode we have to map each page separately, using kmap(). That way 310 * adjacent pages are mapped to non-adjacent virtual addresses. That's why we 311 * have to use a bounce buffer for blocks, crossing page boundaries. Such blocks 312 * have been observed with an SDIO WiFi card (b43 driver). 313 */ 314static void usdhi6_blk_bounce(struct usdhi6_host *host, 315 struct scatterlist *sg) 316{ 317 struct mmc_data *data = host->mrq->data; 318 size_t blk_head = host->head_len; 319 320 dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u of %u SG: %ux%u @ 0x%x\n", 321 __func__, host->mrq->cmd->opcode, data->sg_len, 322 data->blksz, data->blocks, sg->offset); 323 324 host->head_pg.page = host->pg.page; 325 host->head_pg.mapped = host->pg.mapped; 326 host->pg.page = nth_page(host->pg.page, 1); 327 host->pg.mapped = kmap(host->pg.page); 328 329 host->blk_page = host->bounce_buf; 330 host->offset = 0; 331 332 if (data->flags & MMC_DATA_READ) 333 return; 334 335 memcpy(host->bounce_buf, host->head_pg.mapped + PAGE_SIZE - blk_head, 336 blk_head); 337 memcpy(host->bounce_buf + blk_head, host->pg.mapped, 338 data->blksz - blk_head); 339} 340 341/* Only called for multiple block IO */ 342static void usdhi6_sg_prep(struct usdhi6_host *host) 343{ 344 struct mmc_request *mrq = host->mrq; 345 struct mmc_data *data = mrq->data; 346 347 usdhi6_write(host, USDHI6_SD_SECCNT, data->blocks); 348 349 host->sg = data->sg; 350 /* TODO: if we always map, this is redundant */ 351 host->offset = host->sg->offset; 352} 353 354/* Map the first page in an SG segment: common for multiple and single block IO */ 355static void *usdhi6_sg_map(struct usdhi6_host *host) 356{ 357 struct mmc_data *data = host->mrq->data; 358 struct scatterlist *sg = data->sg_len > 1 ? host->sg : data->sg; 359 size_t head = PAGE_SIZE - sg->offset; 360 size_t blk_head = head % data->blksz; 361 362 WARN(host->pg.page, "%p not properly unmapped!\n", host->pg.page); 363 if (WARN(sg_dma_len(sg) % data->blksz, 364 "SG size %u isn't a multiple of block size %u\n", 365 sg_dma_len(sg), data->blksz)) 366 return NULL; 367 368 host->pg.page = sg_page(sg); 369 host->pg.mapped = kmap(host->pg.page); 370 host->offset = sg->offset; 371 372 /* 373 * Block size must be a power of 2 for multi-block transfers, 374 * therefore blk_head is equal for all pages in this SG 375 */ 376 host->head_len = blk_head; 377 378 if (head < data->blksz) 379 /* 380 * The first block in the SG crosses a page boundary. 381 * Max blksz = 512, so blocks can only span 2 pages 382 */ 383 usdhi6_blk_bounce(host, sg); 384 else 385 host->blk_page = host->pg.mapped; 386 387 dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p + %u for CMD%u @ 0x%p\n", 388 host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, 389 sg->offset, host->mrq->cmd->opcode, host->mrq); 390 391 return host->blk_page + host->offset; 392} 393 394/* Unmap the current page: common for multiple and single block IO */ 395static void usdhi6_sg_unmap(struct usdhi6_host *host, bool force) 396{ 397 struct mmc_data *data = host->mrq->data; 398 struct page *page = host->head_pg.page; 399 400 if (page) { 401 /* Previous block was cross-page boundary */ 402 struct scatterlist *sg = data->sg_len > 1 ? 403 host->sg : data->sg; 404 size_t blk_head = host->head_len; 405 406 if (!data->error && data->flags & MMC_DATA_READ) { 407 memcpy(host->head_pg.mapped + PAGE_SIZE - blk_head, 408 host->bounce_buf, blk_head); 409 memcpy(host->pg.mapped, host->bounce_buf + blk_head, 410 data->blksz - blk_head); 411 } 412 413 flush_dcache_page(page); 414 kunmap(page); 415 416 host->head_pg.page = NULL; 417 418 if (!force && sg_dma_len(sg) + sg->offset > 419 (host->page_idx << PAGE_SHIFT) + data->blksz - blk_head) 420 /* More blocks in this SG, don't unmap the next page */ 421 return; 422 } 423 424 page = host->pg.page; 425 if (!page) 426 return; 427 428 flush_dcache_page(page); 429 kunmap(page); 430 431 host->pg.page = NULL; 432} 433 434/* Called from MMC_WRITE_MULTIPLE_BLOCK or MMC_READ_MULTIPLE_BLOCK */ 435static void usdhi6_sg_advance(struct usdhi6_host *host) 436{ 437 struct mmc_data *data = host->mrq->data; 438 size_t done, total; 439 440 /* New offset: set at the end of the previous block */ 441 if (host->head_pg.page) { 442 /* Finished a cross-page block, jump to the new page */ 443 host->page_idx++; 444 host->offset = data->blksz - host->head_len; 445 host->blk_page = host->pg.mapped; 446 usdhi6_sg_unmap(host, false); 447 } else { 448 host->offset += data->blksz; 449 /* The completed block didn't cross a page boundary */ 450 if (host->offset == PAGE_SIZE) { 451 /* If required, we'll map the page below */ 452 host->offset = 0; 453 host->page_idx++; 454 } 455 } 456 457 /* 458 * Now host->blk_page + host->offset point at the end of our last block 459 * and host->page_idx is the index of the page, in which our new block 460 * is located, if any 461 */ 462 463 done = (host->page_idx << PAGE_SHIFT) + host->offset; 464 total = host->sg->offset + sg_dma_len(host->sg); 465 466 dev_dbg(mmc_dev(host->mmc), "%s(): %zu of %zu @ %zu\n", __func__, 467 done, total, host->offset); 468 469 if (done < total && host->offset) { 470 /* More blocks in this page */ 471 if (host->offset + data->blksz > PAGE_SIZE) 472 /* We approached at a block, that spans 2 pages */ 473 usdhi6_blk_bounce(host, host->sg); 474 475 return; 476 } 477 478 /* Finished current page or an SG segment */ 479 usdhi6_sg_unmap(host, false); 480 481 if (done == total) { 482 /* 483 * End of an SG segment or the complete SG: jump to the next 484 * segment, we'll map it later in usdhi6_blk_read() or 485 * usdhi6_blk_write() 486 */ 487 struct scatterlist *next = sg_next(host->sg); 488 489 host->page_idx = 0; 490 491 if (!next) 492 host->wait = USDHI6_WAIT_FOR_DATA_END; 493 host->sg = next; 494 495 if (WARN(next && sg_dma_len(next) % data->blksz, 496 "SG size %u isn't a multiple of block size %u\n", 497 sg_dma_len(next), data->blksz)) 498 data->error = -EINVAL; 499 500 return; 501 } 502 503 /* We cannot get here after crossing a page border */ 504 505 /* Next page in the same SG */ 506 host->pg.page = nth_page(sg_page(host->sg), host->page_idx); 507 host->pg.mapped = kmap(host->pg.page); 508 host->blk_page = host->pg.mapped; 509 510 dev_dbg(mmc_dev(host->mmc), "Mapped %p (%lx) at %p for CMD%u @ 0x%p\n", 511 host->pg.page, page_to_pfn(host->pg.page), host->pg.mapped, 512 host->mrq->cmd->opcode, host->mrq); 513} 514 515/* DMA handling */ 516 517static void usdhi6_dma_release(struct usdhi6_host *host) 518{ 519 host->dma_active = false; 520 if (host->chan_tx) { 521 struct dma_chan *chan = host->chan_tx; 522 host->chan_tx = NULL; 523 dma_release_channel(chan); 524 } 525 if (host->chan_rx) { 526 struct dma_chan *chan = host->chan_rx; 527 host->chan_rx = NULL; 528 dma_release_channel(chan); 529 } 530} 531 532static void usdhi6_dma_stop_unmap(struct usdhi6_host *host) 533{ 534 struct mmc_data *data = host->mrq->data; 535 536 if (!host->dma_active) 537 return; 538 539 usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); 540 host->dma_active = false; 541 542 if (data->flags & MMC_DATA_READ) 543 dma_unmap_sg(host->chan_rx->device->dev, data->sg, 544 data->sg_len, DMA_FROM_DEVICE); 545 else 546 dma_unmap_sg(host->chan_tx->device->dev, data->sg, 547 data->sg_len, DMA_TO_DEVICE); 548} 549 550static void usdhi6_dma_complete(void *arg) 551{ 552 struct usdhi6_host *host = arg; 553 struct mmc_request *mrq = host->mrq; 554 555 if (WARN(!mrq || !mrq->data, "%s: NULL data in DMA completion for %p!\n", 556 dev_name(mmc_dev(host->mmc)), mrq)) 557 return; 558 559 dev_dbg(mmc_dev(host->mmc), "%s(): CMD%u DMA completed\n", __func__, 560 mrq->cmd->opcode); 561 562 usdhi6_dma_stop_unmap(host); 563 usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); 564} 565 566static int usdhi6_dma_setup(struct usdhi6_host *host, struct dma_chan *chan, 567 enum dma_transfer_direction dir) 568{ 569 struct mmc_data *data = host->mrq->data; 570 struct scatterlist *sg = data->sg; 571 struct dma_async_tx_descriptor *desc = NULL; 572 dma_cookie_t cookie = -EINVAL; 573 enum dma_data_direction data_dir; 574 int ret; 575 576 switch (dir) { 577 case DMA_MEM_TO_DEV: 578 data_dir = DMA_TO_DEVICE; 579 break; 580 case DMA_DEV_TO_MEM: 581 data_dir = DMA_FROM_DEVICE; 582 break; 583 default: 584 return -EINVAL; 585 } 586 587 ret = dma_map_sg(chan->device->dev, sg, data->sg_len, data_dir); 588 if (ret > 0) { 589 host->dma_active = true; 590 desc = dmaengine_prep_slave_sg(chan, sg, ret, dir, 591 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 592 } 593 594 if (desc) { 595 desc->callback = usdhi6_dma_complete; 596 desc->callback_param = host; 597 cookie = dmaengine_submit(desc); 598 } 599 600 dev_dbg(mmc_dev(host->mmc), "%s(): mapped %d -> %d, cookie %d @ %p\n", 601 __func__, data->sg_len, ret, cookie, desc); 602 603 if (cookie < 0) { 604 /* DMA failed, fall back to PIO */ 605 if (ret >= 0) 606 ret = cookie; 607 usdhi6_dma_release(host); 608 dev_warn(mmc_dev(host->mmc), 609 "DMA failed: %d, falling back to PIO\n", ret); 610 } 611 612 return cookie; 613} 614 615static int usdhi6_dma_start(struct usdhi6_host *host) 616{ 617 if (!host->chan_rx || !host->chan_tx) 618 return -ENODEV; 619 620 if (host->mrq->data->flags & MMC_DATA_READ) 621 return usdhi6_dma_setup(host, host->chan_rx, DMA_DEV_TO_MEM); 622 623 return usdhi6_dma_setup(host, host->chan_tx, DMA_MEM_TO_DEV); 624} 625 626static void usdhi6_dma_kill(struct usdhi6_host *host) 627{ 628 struct mmc_data *data = host->mrq->data; 629 630 dev_dbg(mmc_dev(host->mmc), "%s(): SG of %u: %ux%u\n", 631 __func__, data->sg_len, data->blocks, data->blksz); 632 /* Abort DMA */ 633 if (data->flags & MMC_DATA_READ) 634 dmaengine_terminate_all(host->chan_rx); 635 else 636 dmaengine_terminate_all(host->chan_tx); 637} 638 639static void usdhi6_dma_check_error(struct usdhi6_host *host) 640{ 641 struct mmc_data *data = host->mrq->data; 642 643 dev_dbg(mmc_dev(host->mmc), "%s(): IO error %d, status 0x%x\n", 644 __func__, host->io_error, usdhi6_read(host, USDHI6_SD_INFO1)); 645 646 if (host->io_error) { 647 data->error = usdhi6_error_code(host); 648 data->bytes_xfered = 0; 649 usdhi6_dma_kill(host); 650 usdhi6_dma_release(host); 651 dev_warn(mmc_dev(host->mmc), 652 "DMA failed: %d, falling back to PIO\n", data->error); 653 return; 654 } 655 656 /* 657 * The datasheet tells us to check a response from the card, whereas 658 * responses only come after the command phase, not after the data 659 * phase. Let's check anyway. 660 */ 661 if (host->irq_status & USDHI6_SD_INFO1_RSP_END) 662 dev_warn(mmc_dev(host->mmc), "Unexpected response received!\n"); 663} 664 665static void usdhi6_dma_kick(struct usdhi6_host *host) 666{ 667 if (host->mrq->data->flags & MMC_DATA_READ) 668 dma_async_issue_pending(host->chan_rx); 669 else 670 dma_async_issue_pending(host->chan_tx); 671} 672 673static void usdhi6_dma_request(struct usdhi6_host *host, phys_addr_t start) 674{ 675 struct dma_slave_config cfg = { 676 .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 677 .dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, 678 }; 679 int ret; 680 681 host->chan_tx = dma_request_chan(mmc_dev(host->mmc), "tx"); 682 dev_dbg(mmc_dev(host->mmc), "%s: TX: got channel %p\n", __func__, 683 host->chan_tx); 684 685 if (IS_ERR(host->chan_tx)) { 686 host->chan_tx = NULL; 687 return; 688 } 689 690 cfg.direction = DMA_MEM_TO_DEV; 691 cfg.dst_addr = start + USDHI6_SD_BUF0; 692 cfg.dst_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ 693 cfg.src_addr = 0; 694 ret = dmaengine_slave_config(host->chan_tx, &cfg); 695 if (ret < 0) 696 goto e_release_tx; 697 698 host->chan_rx = dma_request_chan(mmc_dev(host->mmc), "rx"); 699 dev_dbg(mmc_dev(host->mmc), "%s: RX: got channel %p\n", __func__, 700 host->chan_rx); 701 702 if (IS_ERR(host->chan_rx)) { 703 host->chan_rx = NULL; 704 goto e_release_tx; 705 } 706 707 cfg.direction = DMA_DEV_TO_MEM; 708 cfg.src_addr = cfg.dst_addr; 709 cfg.src_maxburst = 128; /* 128 words * 4 bytes = 512 bytes */ 710 cfg.dst_addr = 0; 711 ret = dmaengine_slave_config(host->chan_rx, &cfg); 712 if (ret < 0) 713 goto e_release_rx; 714 715 return; 716 717e_release_rx: 718 dma_release_channel(host->chan_rx); 719 host->chan_rx = NULL; 720e_release_tx: 721 dma_release_channel(host->chan_tx); 722 host->chan_tx = NULL; 723} 724 725/* API helpers */ 726 727static void usdhi6_clk_set(struct usdhi6_host *host, struct mmc_ios *ios) 728{ 729 unsigned long rate = ios->clock; 730 u32 val; 731 unsigned int i; 732 733 for (i = 1000; i; i--) { 734 if (usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_SCLKDIVEN) 735 break; 736 usleep_range(10, 100); 737 } 738 739 if (!i) { 740 dev_err(mmc_dev(host->mmc), "SD bus busy, clock set aborted\n"); 741 return; 742 } 743 744 val = usdhi6_read(host, USDHI6_SD_CLK_CTRL) & ~USDHI6_SD_CLK_CTRL_DIV_MASK; 745 746 if (rate) { 747 unsigned long new_rate; 748 749 if (host->imclk <= rate) { 750 if (ios->timing != MMC_TIMING_UHS_DDR50) { 751 /* Cannot have 1-to-1 clock in DDR mode */ 752 new_rate = host->imclk; 753 val |= 0xff; 754 } else { 755 new_rate = host->imclk / 2; 756 } 757 } else { 758 unsigned long div = 759 roundup_pow_of_two(DIV_ROUND_UP(host->imclk, rate)); 760 val |= div >> 2; 761 new_rate = host->imclk / div; 762 } 763 764 if (host->rate == new_rate) 765 return; 766 767 host->rate = new_rate; 768 769 dev_dbg(mmc_dev(host->mmc), "target %lu, div %u, set %lu\n", 770 rate, (val & 0xff) << 2, new_rate); 771 } 772 773 /* 774 * if old or new rate is equal to input rate, have to switch the clock 775 * off before changing and on after 776 */ 777 if (host->imclk == rate || host->imclk == host->rate || !rate) 778 usdhi6_write(host, USDHI6_SD_CLK_CTRL, 779 val & ~USDHI6_SD_CLK_CTRL_SCLKEN); 780 781 if (!rate) { 782 host->rate = 0; 783 return; 784 } 785 786 usdhi6_write(host, USDHI6_SD_CLK_CTRL, val); 787 788 if (host->imclk == rate || host->imclk == host->rate || 789 !(val & USDHI6_SD_CLK_CTRL_SCLKEN)) 790 usdhi6_write(host, USDHI6_SD_CLK_CTRL, 791 val | USDHI6_SD_CLK_CTRL_SCLKEN); 792} 793 794static void usdhi6_set_power(struct usdhi6_host *host, struct mmc_ios *ios) 795{ 796 struct mmc_host *mmc = host->mmc; 797 798 if (!IS_ERR(mmc->supply.vmmc)) 799 /* Errors ignored... */ 800 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 801 ios->power_mode ? ios->vdd : 0); 802} 803 804static int usdhi6_reset(struct usdhi6_host *host) 805{ 806 int i; 807 808 usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED); 809 cpu_relax(); 810 usdhi6_write(host, USDHI6_SOFT_RST, USDHI6_SOFT_RST_RESERVED | USDHI6_SOFT_RST_RESET); 811 for (i = 1000; i; i--) 812 if (usdhi6_read(host, USDHI6_SOFT_RST) & USDHI6_SOFT_RST_RESET) 813 break; 814 815 return i ? 0 : -ETIMEDOUT; 816} 817 818static void usdhi6_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 819{ 820 struct usdhi6_host *host = mmc_priv(mmc); 821 u32 option, mode; 822 int ret; 823 824 dev_dbg(mmc_dev(mmc), "%uHz, OCR: %u, power %u, bus-width %u, timing %u\n", 825 ios->clock, ios->vdd, ios->power_mode, ios->bus_width, ios->timing); 826 827 switch (ios->power_mode) { 828 case MMC_POWER_OFF: 829 usdhi6_set_power(host, ios); 830 usdhi6_only_cd(host); 831 break; 832 case MMC_POWER_UP: 833 /* 834 * We only also touch USDHI6_SD_OPTION from .request(), which 835 * cannot race with MMC_POWER_UP 836 */ 837 ret = usdhi6_reset(host); 838 if (ret < 0) { 839 dev_err(mmc_dev(mmc), "Cannot reset the interface!\n"); 840 } else { 841 usdhi6_set_power(host, ios); 842 usdhi6_only_cd(host); 843 } 844 break; 845 case MMC_POWER_ON: 846 option = usdhi6_read(host, USDHI6_SD_OPTION); 847 /* 848 * The eMMC standard only allows 4 or 8 bits in the DDR mode, 849 * the same probably holds for SD cards. We check here anyway, 850 * since the datasheet explicitly requires 4 bits for DDR. 851 */ 852 if (ios->bus_width == MMC_BUS_WIDTH_1) { 853 if (ios->timing == MMC_TIMING_UHS_DDR50) 854 dev_err(mmc_dev(mmc), 855 "4 bits are required for DDR\n"); 856 option |= USDHI6_SD_OPTION_WIDTH_1; 857 mode = 0; 858 } else { 859 option &= ~USDHI6_SD_OPTION_WIDTH_1; 860 mode = ios->timing == MMC_TIMING_UHS_DDR50; 861 } 862 usdhi6_write(host, USDHI6_SD_OPTION, option); 863 usdhi6_write(host, USDHI6_SDIF_MODE, mode); 864 break; 865 } 866 867 if (host->rate != ios->clock) 868 usdhi6_clk_set(host, ios); 869} 870 871/* This is data timeout. Response timeout is fixed to 640 clock cycles */ 872static void usdhi6_timeout_set(struct usdhi6_host *host) 873{ 874 struct mmc_request *mrq = host->mrq; 875 u32 val; 876 unsigned long ticks; 877 878 if (!mrq->data) 879 ticks = host->rate / 1000 * mrq->cmd->busy_timeout; 880 else 881 ticks = host->rate / 1000000 * (mrq->data->timeout_ns / 1000) + 882 mrq->data->timeout_clks; 883 884 if (!ticks || ticks > 1 << 27) 885 /* Max timeout */ 886 val = 14; 887 else if (ticks < 1 << 13) 888 /* Min timeout */ 889 val = 0; 890 else 891 val = order_base_2(ticks) - 13; 892 893 dev_dbg(mmc_dev(host->mmc), "Set %s timeout %lu ticks @ %lu Hz\n", 894 mrq->data ? "data" : "cmd", ticks, host->rate); 895 896 /* Timeout Counter mask: 0xf0 */ 897 usdhi6_write(host, USDHI6_SD_OPTION, (val << USDHI6_SD_OPTION_TIMEOUT_SHIFT) | 898 (usdhi6_read(host, USDHI6_SD_OPTION) & ~USDHI6_SD_OPTION_TIMEOUT_MASK)); 899} 900 901static void usdhi6_request_done(struct usdhi6_host *host) 902{ 903 struct mmc_request *mrq = host->mrq; 904 struct mmc_data *data = mrq->data; 905 906 if (WARN(host->pg.page || host->head_pg.page, 907 "Page %p or %p not unmapped: wait %u, CMD%d(%c) @ +0x%zx %ux%u in SG%u!\n", 908 host->pg.page, host->head_pg.page, host->wait, mrq->cmd->opcode, 909 data ? (data->flags & MMC_DATA_READ ? 'R' : 'W') : '-', 910 data ? host->offset : 0, data ? data->blocks : 0, 911 data ? data->blksz : 0, data ? data->sg_len : 0)) 912 usdhi6_sg_unmap(host, true); 913 914 if (mrq->cmd->error || 915 (data && data->error) || 916 (mrq->stop && mrq->stop->error)) 917 dev_dbg(mmc_dev(host->mmc), "%s(CMD%d: %ux%u): err %d %d %d\n", 918 __func__, mrq->cmd->opcode, data ? data->blocks : 0, 919 data ? data->blksz : 0, 920 mrq->cmd->error, 921 data ? data->error : 1, 922 mrq->stop ? mrq->stop->error : 1); 923 924 /* Disable DMA */ 925 usdhi6_write(host, USDHI6_CC_EXT_MODE, 0); 926 host->wait = USDHI6_WAIT_FOR_REQUEST; 927 host->mrq = NULL; 928 929 mmc_request_done(host->mmc, mrq); 930} 931 932static int usdhi6_cmd_flags(struct usdhi6_host *host) 933{ 934 struct mmc_request *mrq = host->mrq; 935 struct mmc_command *cmd = mrq->cmd; 936 u16 opc = cmd->opcode; 937 938 if (host->app_cmd) { 939 host->app_cmd = false; 940 opc |= USDHI6_SD_CMD_APP; 941 } 942 943 if (mrq->data) { 944 opc |= USDHI6_SD_CMD_DATA; 945 946 if (mrq->data->flags & MMC_DATA_READ) 947 opc |= USDHI6_SD_CMD_READ; 948 949 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || 950 cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || 951 (cmd->opcode == SD_IO_RW_EXTENDED && 952 mrq->data->blocks > 1)) { 953 opc |= USDHI6_SD_CMD_MULTI; 954 if (!mrq->stop) 955 opc |= USDHI6_SD_CMD_CMD12_AUTO_OFF; 956 } 957 958 switch (mmc_resp_type(cmd)) { 959 case MMC_RSP_NONE: 960 opc |= USDHI6_SD_CMD_MODE_RSP_NONE; 961 break; 962 case MMC_RSP_R1: 963 opc |= USDHI6_SD_CMD_MODE_RSP_R1; 964 break; 965 case MMC_RSP_R1B: 966 opc |= USDHI6_SD_CMD_MODE_RSP_R1B; 967 break; 968 case MMC_RSP_R2: 969 opc |= USDHI6_SD_CMD_MODE_RSP_R2; 970 break; 971 case MMC_RSP_R3: 972 opc |= USDHI6_SD_CMD_MODE_RSP_R3; 973 break; 974 default: 975 dev_warn(mmc_dev(host->mmc), 976 "Unknown response type %d\n", 977 mmc_resp_type(cmd)); 978 return -EINVAL; 979 } 980 } 981 982 return opc; 983} 984 985static int usdhi6_rq_start(struct usdhi6_host *host) 986{ 987 struct mmc_request *mrq = host->mrq; 988 struct mmc_command *cmd = mrq->cmd; 989 struct mmc_data *data = mrq->data; 990 int opc = usdhi6_cmd_flags(host); 991 int i; 992 993 if (opc < 0) 994 return opc; 995 996 for (i = 1000; i; i--) { 997 if (!(usdhi6_read(host, USDHI6_SD_INFO2) & USDHI6_SD_INFO2_CBSY)) 998 break; 999 usleep_range(10, 100); 1000 } 1001 1002 if (!i) { 1003 dev_dbg(mmc_dev(host->mmc), "Command active, request aborted\n"); 1004 return -EAGAIN; 1005 } 1006 1007 if (data) { 1008 bool use_dma; 1009 int ret = 0; 1010 1011 host->page_idx = 0; 1012 1013 if (cmd->opcode == SD_IO_RW_EXTENDED && data->blocks > 1) { 1014 switch (data->blksz) { 1015 case 512: 1016 break; 1017 case 32: 1018 case 64: 1019 case 128: 1020 case 256: 1021 if (mrq->stop) 1022 ret = -EINVAL; 1023 break; 1024 default: 1025 ret = -EINVAL; 1026 } 1027 } else if ((cmd->opcode == MMC_READ_MULTIPLE_BLOCK || 1028 cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) && 1029 data->blksz != 512) { 1030 ret = -EINVAL; 1031 } 1032 1033 if (ret < 0) { 1034 dev_warn(mmc_dev(host->mmc), "%s(): %u blocks of %u bytes\n", 1035 __func__, data->blocks, data->blksz); 1036 return -EINVAL; 1037 } 1038 1039 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || 1040 cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || 1041 (cmd->opcode == SD_IO_RW_EXTENDED && 1042 data->blocks > 1)) 1043 usdhi6_sg_prep(host); 1044 1045 usdhi6_write(host, USDHI6_SD_SIZE, data->blksz); 1046 1047 if ((data->blksz >= USDHI6_MIN_DMA || 1048 data->blocks > 1) && 1049 (data->blksz % 4 || 1050 data->sg->offset % 4)) 1051 dev_dbg(mmc_dev(host->mmc), 1052 "Bad SG of %u: %ux%u @ %u\n", data->sg_len, 1053 data->blksz, data->blocks, data->sg->offset); 1054 1055 /* Enable DMA for USDHI6_MIN_DMA bytes or more */ 1056 use_dma = data->blksz >= USDHI6_MIN_DMA && 1057 !(data->blksz % 4) && 1058 usdhi6_dma_start(host) >= DMA_MIN_COOKIE; 1059 1060 if (use_dma) 1061 usdhi6_write(host, USDHI6_CC_EXT_MODE, USDHI6_CC_EXT_MODE_SDRW); 1062 1063 dev_dbg(mmc_dev(host->mmc), 1064 "%s(): request opcode %u, %u blocks of %u bytes in %u segments, %s %s @+0x%x%s\n", 1065 __func__, cmd->opcode, data->blocks, data->blksz, 1066 data->sg_len, use_dma ? "DMA" : "PIO", 1067 data->flags & MMC_DATA_READ ? "read" : "write", 1068 data->sg->offset, mrq->stop ? " + stop" : ""); 1069 } else { 1070 dev_dbg(mmc_dev(host->mmc), "%s(): request opcode %u\n", 1071 __func__, cmd->opcode); 1072 } 1073 1074 /* We have to get a command completion interrupt with DMA too */ 1075 usdhi6_wait_for_resp(host); 1076 1077 host->wait = USDHI6_WAIT_FOR_CMD; 1078 schedule_delayed_work(&host->timeout_work, host->timeout); 1079 1080 /* SEC bit is required to enable block counting by the core */ 1081 usdhi6_write(host, USDHI6_SD_STOP, 1082 data && data->blocks > 1 ? USDHI6_SD_STOP_SEC : 0); 1083 usdhi6_write(host, USDHI6_SD_ARG, cmd->arg); 1084 1085 /* Kick command execution */ 1086 usdhi6_write(host, USDHI6_SD_CMD, opc); 1087 1088 return 0; 1089} 1090 1091static void usdhi6_request(struct mmc_host *mmc, struct mmc_request *mrq) 1092{ 1093 struct usdhi6_host *host = mmc_priv(mmc); 1094 int ret; 1095 1096 cancel_delayed_work_sync(&host->timeout_work); 1097 1098 host->mrq = mrq; 1099 host->sg = NULL; 1100 1101 usdhi6_timeout_set(host); 1102 ret = usdhi6_rq_start(host); 1103 if (ret < 0) { 1104 mrq->cmd->error = ret; 1105 usdhi6_request_done(host); 1106 } 1107} 1108 1109static int usdhi6_get_cd(struct mmc_host *mmc) 1110{ 1111 struct usdhi6_host *host = mmc_priv(mmc); 1112 /* Read is atomic, no need to lock */ 1113 u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_CD; 1114 1115/* 1116 * level status.CD CD_ACTIVE_HIGH card present 1117 * 1 0 0 0 1118 * 1 0 1 1 1119 * 0 1 0 1 1120 * 0 1 1 0 1121 */ 1122 return !status ^ !(mmc->caps2 & MMC_CAP2_CD_ACTIVE_HIGH); 1123} 1124 1125static int usdhi6_get_ro(struct mmc_host *mmc) 1126{ 1127 struct usdhi6_host *host = mmc_priv(mmc); 1128 /* No locking as above */ 1129 u32 status = usdhi6_read(host, USDHI6_SD_INFO1) & USDHI6_SD_INFO1_WP; 1130 1131/* 1132 * level status.WP RO_ACTIVE_HIGH card read-only 1133 * 1 0 0 0 1134 * 1 0 1 1 1135 * 0 1 0 1 1136 * 0 1 1 0 1137 */ 1138 return !status ^ !(mmc->caps2 & MMC_CAP2_RO_ACTIVE_HIGH); 1139} 1140 1141static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable) 1142{ 1143 struct usdhi6_host *host = mmc_priv(mmc); 1144 1145 dev_dbg(mmc_dev(mmc), "%s(): %sable\n", __func__, enable ? "en" : "dis"); 1146 1147 if (enable) { 1148 host->sdio_mask = USDHI6_SDIO_INFO1_IRQ & ~USDHI6_SDIO_INFO1_IOIRQ; 1149 usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, host->sdio_mask); 1150 usdhi6_write(host, USDHI6_SDIO_MODE, 1); 1151 } else { 1152 usdhi6_write(host, USDHI6_SDIO_MODE, 0); 1153 usdhi6_write(host, USDHI6_SDIO_INFO1_MASK, USDHI6_SDIO_INFO1_IRQ); 1154 host->sdio_mask = USDHI6_SDIO_INFO1_IRQ; 1155 } 1156} 1157 1158static int usdhi6_set_pinstates(struct usdhi6_host *host, int voltage) 1159{ 1160 if (IS_ERR(host->pins_uhs)) 1161 return 0; 1162 1163 switch (voltage) { 1164 case MMC_SIGNAL_VOLTAGE_180: 1165 case MMC_SIGNAL_VOLTAGE_120: 1166 return pinctrl_select_state(host->pinctrl, 1167 host->pins_uhs); 1168 1169 default: 1170 return pinctrl_select_default_state(mmc_dev(host->mmc)); 1171 } 1172} 1173 1174static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios) 1175{ 1176 int ret; 1177 1178 ret = mmc_regulator_set_vqmmc(mmc, ios); 1179 if (ret < 0) 1180 return ret; 1181 1182 ret = usdhi6_set_pinstates(mmc_priv(mmc), ios->signal_voltage); 1183 if (ret) 1184 dev_warn_once(mmc_dev(mmc), 1185 "Failed to set pinstate err=%d\n", ret); 1186 return ret; 1187} 1188 1189static const struct mmc_host_ops usdhi6_ops = { 1190 .request = usdhi6_request, 1191 .set_ios = usdhi6_set_ios, 1192 .get_cd = usdhi6_get_cd, 1193 .get_ro = usdhi6_get_ro, 1194 .enable_sdio_irq = usdhi6_enable_sdio_irq, 1195 .start_signal_voltage_switch = usdhi6_sig_volt_switch, 1196}; 1197 1198/* State machine handlers */ 1199 1200static void usdhi6_resp_cmd12(struct usdhi6_host *host) 1201{ 1202 struct mmc_command *cmd = host->mrq->stop; 1203 cmd->resp[0] = usdhi6_read(host, USDHI6_SD_RSP10); 1204} 1205 1206static void usdhi6_resp_read(struct usdhi6_host *host) 1207{ 1208 struct mmc_command *cmd = host->mrq->cmd; 1209 u32 *rsp = cmd->resp, tmp = 0; 1210 int i; 1211 1212/* 1213 * RSP10 39-8 1214 * RSP32 71-40 1215 * RSP54 103-72 1216 * RSP76 127-104 1217 * R2-type response: 1218 * resp[0] = r[127..96] 1219 * resp[1] = r[95..64] 1220 * resp[2] = r[63..32] 1221 * resp[3] = r[31..0] 1222 * Other responses: 1223 * resp[0] = r[39..8] 1224 */ 1225 1226 if (mmc_resp_type(cmd) == MMC_RSP_NONE) 1227 return; 1228 1229 if (!(host->irq_status & USDHI6_SD_INFO1_RSP_END)) { 1230 dev_err(mmc_dev(host->mmc), 1231 "CMD%d: response expected but is missing!\n", cmd->opcode); 1232 return; 1233 } 1234 1235 if (mmc_resp_type(cmd) & MMC_RSP_136) 1236 for (i = 0; i < 4; i++) { 1237 if (i) 1238 rsp[3 - i] = tmp >> 24; 1239 tmp = usdhi6_read(host, USDHI6_SD_RSP10 + i * 8); 1240 rsp[3 - i] |= tmp << 8; 1241 } 1242 else if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || 1243 cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK) 1244 /* Read RSP54 to avoid conflict with auto CMD12 */ 1245 rsp[0] = usdhi6_read(host, USDHI6_SD_RSP54); 1246 else 1247 rsp[0] = usdhi6_read(host, USDHI6_SD_RSP10); 1248 1249 dev_dbg(mmc_dev(host->mmc), "Response 0x%x\n", rsp[0]); 1250} 1251 1252static int usdhi6_blk_read(struct usdhi6_host *host) 1253{ 1254 struct mmc_data *data = host->mrq->data; 1255 u32 *p; 1256 int i, rest; 1257 1258 if (host->io_error) { 1259 data->error = usdhi6_error_code(host); 1260 goto error; 1261 } 1262 1263 if (host->pg.page) { 1264 p = host->blk_page + host->offset; 1265 } else { 1266 p = usdhi6_sg_map(host); 1267 if (!p) { 1268 data->error = -ENOMEM; 1269 goto error; 1270 } 1271 } 1272 1273 for (i = 0; i < data->blksz / 4; i++, p++) 1274 *p = usdhi6_read(host, USDHI6_SD_BUF0); 1275 1276 rest = data->blksz % 4; 1277 for (i = 0; i < (rest + 1) / 2; i++) { 1278 u16 d = usdhi6_read16(host, USDHI6_SD_BUF0); 1279 ((u8 *)p)[2 * i] = ((u8 *)&d)[0]; 1280 if (rest > 1 && !i) 1281 ((u8 *)p)[2 * i + 1] = ((u8 *)&d)[1]; 1282 } 1283 1284 return 0; 1285 1286error: 1287 dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); 1288 host->wait = USDHI6_WAIT_FOR_REQUEST; 1289 return data->error; 1290} 1291 1292static int usdhi6_blk_write(struct usdhi6_host *host) 1293{ 1294 struct mmc_data *data = host->mrq->data; 1295 u32 *p; 1296 int i, rest; 1297 1298 if (host->io_error) { 1299 data->error = usdhi6_error_code(host); 1300 goto error; 1301 } 1302 1303 if (host->pg.page) { 1304 p = host->blk_page + host->offset; 1305 } else { 1306 p = usdhi6_sg_map(host); 1307 if (!p) { 1308 data->error = -ENOMEM; 1309 goto error; 1310 } 1311 } 1312 1313 for (i = 0; i < data->blksz / 4; i++, p++) 1314 usdhi6_write(host, USDHI6_SD_BUF0, *p); 1315 1316 rest = data->blksz % 4; 1317 for (i = 0; i < (rest + 1) / 2; i++) { 1318 u16 d; 1319 ((u8 *)&d)[0] = ((u8 *)p)[2 * i]; 1320 if (rest > 1 && !i) 1321 ((u8 *)&d)[1] = ((u8 *)p)[2 * i + 1]; 1322 else 1323 ((u8 *)&d)[1] = 0; 1324 usdhi6_write16(host, USDHI6_SD_BUF0, d); 1325 } 1326 1327 return 0; 1328 1329error: 1330 dev_dbg(mmc_dev(host->mmc), "%s(): %d\n", __func__, data->error); 1331 host->wait = USDHI6_WAIT_FOR_REQUEST; 1332 return data->error; 1333} 1334 1335static int usdhi6_stop_cmd(struct usdhi6_host *host) 1336{ 1337 struct mmc_request *mrq = host->mrq; 1338 1339 switch (mrq->cmd->opcode) { 1340 case MMC_READ_MULTIPLE_BLOCK: 1341 case MMC_WRITE_MULTIPLE_BLOCK: 1342 if (mrq->stop->opcode == MMC_STOP_TRANSMISSION) { 1343 host->wait = USDHI6_WAIT_FOR_STOP; 1344 return 0; 1345 } 1346 fallthrough; /* Unsupported STOP command */ 1347 default: 1348 dev_err(mmc_dev(host->mmc), 1349 "unsupported stop CMD%d for CMD%d\n", 1350 mrq->stop->opcode, mrq->cmd->opcode); 1351 mrq->stop->error = -EOPNOTSUPP; 1352 } 1353 1354 return -EOPNOTSUPP; 1355} 1356 1357static bool usdhi6_end_cmd(struct usdhi6_host *host) 1358{ 1359 struct mmc_request *mrq = host->mrq; 1360 struct mmc_command *cmd = mrq->cmd; 1361 1362 if (host->io_error) { 1363 cmd->error = usdhi6_error_code(host); 1364 return false; 1365 } 1366 1367 usdhi6_resp_read(host); 1368 1369 if (!mrq->data) 1370 return false; 1371 1372 if (host->dma_active) { 1373 usdhi6_dma_kick(host); 1374 if (!mrq->stop) 1375 host->wait = USDHI6_WAIT_FOR_DMA; 1376 else if (usdhi6_stop_cmd(host) < 0) 1377 return false; 1378 } else if (mrq->data->flags & MMC_DATA_READ) { 1379 if (cmd->opcode == MMC_READ_MULTIPLE_BLOCK || 1380 (cmd->opcode == SD_IO_RW_EXTENDED && 1381 mrq->data->blocks > 1)) 1382 host->wait = USDHI6_WAIT_FOR_MREAD; 1383 else 1384 host->wait = USDHI6_WAIT_FOR_READ; 1385 } else { 1386 if (cmd->opcode == MMC_WRITE_MULTIPLE_BLOCK || 1387 (cmd->opcode == SD_IO_RW_EXTENDED && 1388 mrq->data->blocks > 1)) 1389 host->wait = USDHI6_WAIT_FOR_MWRITE; 1390 else 1391 host->wait = USDHI6_WAIT_FOR_WRITE; 1392 } 1393 1394 return true; 1395} 1396 1397static bool usdhi6_read_block(struct usdhi6_host *host) 1398{ 1399 /* ACCESS_END IRQ is already unmasked */ 1400 int ret = usdhi6_blk_read(host); 1401 1402 /* 1403 * Have to force unmapping both pages: the single block could have been 1404 * cross-page, in which case for single-block IO host->page_idx == 0. 1405 * So, if we don't force, the second page won't be unmapped. 1406 */ 1407 usdhi6_sg_unmap(host, true); 1408 1409 if (ret < 0) 1410 return false; 1411 1412 host->wait = USDHI6_WAIT_FOR_DATA_END; 1413 return true; 1414} 1415 1416static bool usdhi6_mread_block(struct usdhi6_host *host) 1417{ 1418 int ret = usdhi6_blk_read(host); 1419 1420 if (ret < 0) 1421 return false; 1422 1423 usdhi6_sg_advance(host); 1424 1425 return !host->mrq->data->error && 1426 (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); 1427} 1428 1429static bool usdhi6_write_block(struct usdhi6_host *host) 1430{ 1431 int ret = usdhi6_blk_write(host); 1432 1433 /* See comment in usdhi6_read_block() */ 1434 usdhi6_sg_unmap(host, true); 1435 1436 if (ret < 0) 1437 return false; 1438 1439 host->wait = USDHI6_WAIT_FOR_DATA_END; 1440 return true; 1441} 1442 1443static bool usdhi6_mwrite_block(struct usdhi6_host *host) 1444{ 1445 int ret = usdhi6_blk_write(host); 1446 1447 if (ret < 0) 1448 return false; 1449 1450 usdhi6_sg_advance(host); 1451 1452 return !host->mrq->data->error && 1453 (host->wait != USDHI6_WAIT_FOR_DATA_END || !host->mrq->stop); 1454} 1455 1456/* Interrupt & timeout handlers */ 1457 1458static irqreturn_t usdhi6_sd_bh(int irq, void *dev_id) 1459{ 1460 struct usdhi6_host *host = dev_id; 1461 struct mmc_request *mrq; 1462 struct mmc_command *cmd; 1463 struct mmc_data *data; 1464 bool io_wait = false; 1465 1466 cancel_delayed_work_sync(&host->timeout_work); 1467 1468 mrq = host->mrq; 1469 if (!mrq) 1470 return IRQ_HANDLED; 1471 1472 cmd = mrq->cmd; 1473 data = mrq->data; 1474 1475 switch (host->wait) { 1476 case USDHI6_WAIT_FOR_REQUEST: 1477 /* We're too late, the timeout has already kicked in */ 1478 return IRQ_HANDLED; 1479 case USDHI6_WAIT_FOR_CMD: 1480 /* Wait for data? */ 1481 io_wait = usdhi6_end_cmd(host); 1482 break; 1483 case USDHI6_WAIT_FOR_MREAD: 1484 /* Wait for more data? */ 1485 io_wait = usdhi6_mread_block(host); 1486 break; 1487 case USDHI6_WAIT_FOR_READ: 1488 /* Wait for data end? */ 1489 io_wait = usdhi6_read_block(host); 1490 break; 1491 case USDHI6_WAIT_FOR_MWRITE: 1492 /* Wait data to write? */ 1493 io_wait = usdhi6_mwrite_block(host); 1494 break; 1495 case USDHI6_WAIT_FOR_WRITE: 1496 /* Wait for data end? */ 1497 io_wait = usdhi6_write_block(host); 1498 break; 1499 case USDHI6_WAIT_FOR_DMA: 1500 usdhi6_dma_check_error(host); 1501 break; 1502 case USDHI6_WAIT_FOR_STOP: 1503 usdhi6_write(host, USDHI6_SD_STOP, 0); 1504 if (host->io_error) { 1505 int ret = usdhi6_error_code(host); 1506 if (mrq->stop) 1507 mrq->stop->error = ret; 1508 else 1509 mrq->data->error = ret; 1510 dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, ret); 1511 break; 1512 } 1513 usdhi6_resp_cmd12(host); 1514 mrq->stop->error = 0; 1515 break; 1516 case USDHI6_WAIT_FOR_DATA_END: 1517 if (host->io_error) { 1518 mrq->data->error = usdhi6_error_code(host); 1519 dev_warn(mmc_dev(host->mmc), "%s(): %d\n", __func__, 1520 mrq->data->error); 1521 } 1522 break; 1523 default: 1524 cmd->error = -EFAULT; 1525 dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); 1526 usdhi6_request_done(host); 1527 return IRQ_HANDLED; 1528 } 1529 1530 if (io_wait) { 1531 schedule_delayed_work(&host->timeout_work, host->timeout); 1532 /* Wait for more data or ACCESS_END */ 1533 if (!host->dma_active) 1534 usdhi6_wait_for_brwe(host, mrq->data->flags & MMC_DATA_READ); 1535 return IRQ_HANDLED; 1536 } 1537 1538 if (!cmd->error) { 1539 if (data) { 1540 if (!data->error) { 1541 if (host->wait != USDHI6_WAIT_FOR_STOP && 1542 host->mrq->stop && 1543 !host->mrq->stop->error && 1544 !usdhi6_stop_cmd(host)) { 1545 /* Sending STOP */ 1546 usdhi6_wait_for_resp(host); 1547 1548 schedule_delayed_work(&host->timeout_work, 1549 host->timeout); 1550 1551 return IRQ_HANDLED; 1552 } 1553 1554 data->bytes_xfered = data->blocks * data->blksz; 1555 } else { 1556 /* Data error: might need to unmap the last page */ 1557 dev_warn(mmc_dev(host->mmc), "%s(): data error %d\n", 1558 __func__, data->error); 1559 usdhi6_sg_unmap(host, true); 1560 } 1561 } else if (cmd->opcode == MMC_APP_CMD) { 1562 host->app_cmd = true; 1563 } 1564 } 1565 1566 usdhi6_request_done(host); 1567 1568 return IRQ_HANDLED; 1569} 1570 1571static irqreturn_t usdhi6_sd(int irq, void *dev_id) 1572{ 1573 struct usdhi6_host *host = dev_id; 1574 u16 status, status2, error; 1575 1576 status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & 1577 ~USDHI6_SD_INFO1_CARD; 1578 status2 = usdhi6_read(host, USDHI6_SD_INFO2) & ~host->status2_mask; 1579 1580 usdhi6_only_cd(host); 1581 1582 dev_dbg(mmc_dev(host->mmc), 1583 "IRQ status = 0x%08x, status2 = 0x%08x\n", status, status2); 1584 1585 if (!status && !status2) 1586 return IRQ_NONE; 1587 1588 error = status2 & USDHI6_SD_INFO2_ERR; 1589 1590 /* Ack / clear interrupts */ 1591 if (USDHI6_SD_INFO1_IRQ & status) 1592 usdhi6_write(host, USDHI6_SD_INFO1, 1593 0xffff & ~(USDHI6_SD_INFO1_IRQ & status)); 1594 1595 if (USDHI6_SD_INFO2_IRQ & status2) { 1596 if (error) 1597 /* In error cases BWE and BRE aren't cleared automatically */ 1598 status2 |= USDHI6_SD_INFO2_BWE | USDHI6_SD_INFO2_BRE; 1599 1600 usdhi6_write(host, USDHI6_SD_INFO2, 1601 0xffff & ~(USDHI6_SD_INFO2_IRQ & status2)); 1602 } 1603 1604 host->io_error = error; 1605 host->irq_status = status; 1606 1607 if (error) { 1608 /* Don't pollute the log with unsupported command timeouts */ 1609 if (host->wait != USDHI6_WAIT_FOR_CMD || 1610 error != USDHI6_SD_INFO2_RSP_TOUT) 1611 dev_warn(mmc_dev(host->mmc), 1612 "%s(): INFO2 error bits 0x%08x\n", 1613 __func__, error); 1614 else 1615 dev_dbg(mmc_dev(host->mmc), 1616 "%s(): INFO2 error bits 0x%08x\n", 1617 __func__, error); 1618 } 1619 1620 return IRQ_WAKE_THREAD; 1621} 1622 1623static irqreturn_t usdhi6_sdio(int irq, void *dev_id) 1624{ 1625 struct usdhi6_host *host = dev_id; 1626 u32 status = usdhi6_read(host, USDHI6_SDIO_INFO1) & ~host->sdio_mask; 1627 1628 dev_dbg(mmc_dev(host->mmc), "%s(): status 0x%x\n", __func__, status); 1629 1630 if (!status) 1631 return IRQ_NONE; 1632 1633 usdhi6_write(host, USDHI6_SDIO_INFO1, ~status); 1634 1635 mmc_signal_sdio_irq(host->mmc); 1636 1637 return IRQ_HANDLED; 1638} 1639 1640static irqreturn_t usdhi6_cd(int irq, void *dev_id) 1641{ 1642 struct usdhi6_host *host = dev_id; 1643 struct mmc_host *mmc = host->mmc; 1644 u16 status; 1645 1646 /* We're only interested in hotplug events here */ 1647 status = usdhi6_read(host, USDHI6_SD_INFO1) & ~host->status_mask & 1648 USDHI6_SD_INFO1_CARD; 1649 1650 if (!status) 1651 return IRQ_NONE; 1652 1653 /* Ack */ 1654 usdhi6_write(host, USDHI6_SD_INFO1, ~status); 1655 1656 if (!work_pending(&mmc->detect.work) && 1657 (((status & USDHI6_SD_INFO1_CARD_INSERT) && 1658 !mmc->card) || 1659 ((status & USDHI6_SD_INFO1_CARD_EJECT) && 1660 mmc->card))) 1661 mmc_detect_change(mmc, msecs_to_jiffies(100)); 1662 1663 return IRQ_HANDLED; 1664} 1665 1666/* 1667 * Actually this should not be needed, if the built-in timeout works reliably in 1668 * the both PIO cases and DMA never fails. But if DMA does fail, a timeout 1669 * handler might be the only way to catch the error. 1670 */ 1671static void usdhi6_timeout_work(struct work_struct *work) 1672{ 1673 struct delayed_work *d = to_delayed_work(work); 1674 struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work); 1675 struct mmc_request *mrq = host->mrq; 1676 struct mmc_data *data = mrq ? mrq->data : NULL; 1677 struct scatterlist *sg; 1678 1679 dev_warn(mmc_dev(host->mmc), 1680 "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n", 1681 host->dma_active ? "DMA" : "PIO", 1682 host->wait, mrq ? mrq->cmd->opcode : -1, 1683 usdhi6_read(host, USDHI6_SD_INFO1), 1684 usdhi6_read(host, USDHI6_SD_INFO2), host->irq_status); 1685 1686 if (host->dma_active) { 1687 usdhi6_dma_kill(host); 1688 usdhi6_dma_stop_unmap(host); 1689 } 1690 1691 switch (host->wait) { 1692 default: 1693 dev_err(mmc_dev(host->mmc), "Invalid state %u\n", host->wait); 1694 fallthrough; /* mrq can be NULL, but is impossible */ 1695 case USDHI6_WAIT_FOR_CMD: 1696 usdhi6_error_code(host); 1697 if (mrq) 1698 mrq->cmd->error = -ETIMEDOUT; 1699 break; 1700 case USDHI6_WAIT_FOR_STOP: 1701 usdhi6_error_code(host); 1702 mrq->stop->error = -ETIMEDOUT; 1703 break; 1704 case USDHI6_WAIT_FOR_DMA: 1705 case USDHI6_WAIT_FOR_MREAD: 1706 case USDHI6_WAIT_FOR_MWRITE: 1707 case USDHI6_WAIT_FOR_READ: 1708 case USDHI6_WAIT_FOR_WRITE: 1709 sg = host->sg ?: data->sg; 1710 dev_dbg(mmc_dev(host->mmc), 1711 "%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n", 1712 data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx, 1713 host->offset, data->blocks, data->blksz, data->sg_len, 1714 sg_dma_len(sg), sg->offset); 1715 usdhi6_sg_unmap(host, true); 1716 fallthrough; /* page unmapped in USDHI6_WAIT_FOR_DATA_END */ 1717 case USDHI6_WAIT_FOR_DATA_END: 1718 usdhi6_error_code(host); 1719 data->error = -ETIMEDOUT; 1720 } 1721 1722 if (mrq) 1723 usdhi6_request_done(host); 1724} 1725 1726/* Probe / release */ 1727 1728static const struct of_device_id usdhi6_of_match[] = { 1729 {.compatible = "renesas,usdhi6rol0"}, 1730 {} 1731}; 1732MODULE_DEVICE_TABLE(of, usdhi6_of_match); 1733 1734static int usdhi6_probe(struct platform_device *pdev) 1735{ 1736 struct device *dev = &pdev->dev; 1737 struct mmc_host *mmc; 1738 struct usdhi6_host *host; 1739 struct resource *res; 1740 int irq_cd, irq_sd, irq_sdio; 1741 u32 version; 1742 int ret; 1743 1744 if (!dev->of_node) 1745 return -ENODEV; 1746 1747 irq_cd = platform_get_irq_byname(pdev, "card detect"); 1748 irq_sd = platform_get_irq_byname(pdev, "data"); 1749 irq_sdio = platform_get_irq_byname(pdev, "SDIO"); 1750 if (irq_sd < 0) 1751 return irq_sd; 1752 if (irq_sdio < 0) 1753 return irq_sdio; 1754 1755 mmc = mmc_alloc_host(sizeof(struct usdhi6_host), dev); 1756 if (!mmc) 1757 return -ENOMEM; 1758 1759 ret = mmc_regulator_get_supply(mmc); 1760 if (ret) 1761 goto e_free_mmc; 1762 1763 ret = mmc_of_parse(mmc); 1764 if (ret < 0) 1765 goto e_free_mmc; 1766 1767 host = mmc_priv(mmc); 1768 host->mmc = mmc; 1769 host->wait = USDHI6_WAIT_FOR_REQUEST; 1770 host->timeout = msecs_to_jiffies(USDHI6_REQ_TIMEOUT_MS); 1771 /* 1772 * We use a fixed timeout of 4s, hence inform the core about it. A 1773 * future improvement should instead respect the cmd->busy_timeout. 1774 */ 1775 mmc->max_busy_timeout = USDHI6_REQ_TIMEOUT_MS; 1776 1777 host->pinctrl = devm_pinctrl_get(&pdev->dev); 1778 if (IS_ERR(host->pinctrl)) { 1779 ret = PTR_ERR(host->pinctrl); 1780 goto e_free_mmc; 1781 } 1782 1783 host->pins_uhs = pinctrl_lookup_state(host->pinctrl, "state_uhs"); 1784 1785 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1786 host->base = devm_ioremap_resource(dev, res); 1787 if (IS_ERR(host->base)) { 1788 ret = PTR_ERR(host->base); 1789 goto e_free_mmc; 1790 } 1791 1792 host->clk = devm_clk_get(dev, NULL); 1793 if (IS_ERR(host->clk)) { 1794 ret = PTR_ERR(host->clk); 1795 goto e_free_mmc; 1796 } 1797 1798 host->imclk = clk_get_rate(host->clk); 1799 1800 ret = clk_prepare_enable(host->clk); 1801 if (ret < 0) 1802 goto e_free_mmc; 1803 1804 version = usdhi6_read(host, USDHI6_VERSION); 1805 if ((version & 0xfff) != 0xa0d) { 1806 ret = -EPERM; 1807 dev_err(dev, "Version not recognized %x\n", version); 1808 goto e_clk_off; 1809 } 1810 1811 dev_info(dev, "A USDHI6ROL0 SD host detected with %d ports\n", 1812 usdhi6_read(host, USDHI6_SD_PORT_SEL) >> USDHI6_SD_PORT_SEL_PORTS_SHIFT); 1813 1814 usdhi6_mask_all(host); 1815 1816 if (irq_cd >= 0) { 1817 ret = devm_request_irq(dev, irq_cd, usdhi6_cd, 0, 1818 dev_name(dev), host); 1819 if (ret < 0) 1820 goto e_clk_off; 1821 } else { 1822 mmc->caps |= MMC_CAP_NEEDS_POLL; 1823 } 1824 1825 ret = devm_request_threaded_irq(dev, irq_sd, usdhi6_sd, usdhi6_sd_bh, 0, 1826 dev_name(dev), host); 1827 if (ret < 0) 1828 goto e_clk_off; 1829 1830 ret = devm_request_irq(dev, irq_sdio, usdhi6_sdio, 0, 1831 dev_name(dev), host); 1832 if (ret < 0) 1833 goto e_clk_off; 1834 1835 INIT_DELAYED_WORK(&host->timeout_work, usdhi6_timeout_work); 1836 1837 usdhi6_dma_request(host, res->start); 1838 1839 mmc->ops = &usdhi6_ops; 1840 mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | 1841 MMC_CAP_SDIO_IRQ; 1842 /* Set .max_segs to some random number. Feel free to adjust. */ 1843 mmc->max_segs = 32; 1844 mmc->max_blk_size = 512; 1845 mmc->max_req_size = PAGE_SIZE * mmc->max_segs; 1846 mmc->max_blk_count = mmc->max_req_size / mmc->max_blk_size; 1847 /* 1848 * Setting .max_seg_size to 1 page would simplify our page-mapping code, 1849 * But OTOH, having large segments makes DMA more efficient. We could 1850 * check, whether we managed to get DMA and fall back to 1 page 1851 * segments, but if we do manage to obtain DMA and then it fails at 1852 * run-time and we fall back to PIO, we will continue getting large 1853 * segments. So, we wouldn't be able to get rid of the code anyway. 1854 */ 1855 mmc->max_seg_size = mmc->max_req_size; 1856 if (!mmc->f_max) 1857 mmc->f_max = host->imclk; 1858 mmc->f_min = host->imclk / 512; 1859 1860 platform_set_drvdata(pdev, host); 1861 1862 ret = mmc_add_host(mmc); 1863 if (ret < 0) 1864 goto e_release_dma; 1865 1866 return 0; 1867 1868e_release_dma: 1869 usdhi6_dma_release(host); 1870e_clk_off: 1871 clk_disable_unprepare(host->clk); 1872e_free_mmc: 1873 mmc_free_host(mmc); 1874 1875 return ret; 1876} 1877 1878static int usdhi6_remove(struct platform_device *pdev) 1879{ 1880 struct usdhi6_host *host = platform_get_drvdata(pdev); 1881 1882 mmc_remove_host(host->mmc); 1883 1884 usdhi6_mask_all(host); 1885 cancel_delayed_work_sync(&host->timeout_work); 1886 usdhi6_dma_release(host); 1887 clk_disable_unprepare(host->clk); 1888 mmc_free_host(host->mmc); 1889 1890 return 0; 1891} 1892 1893static struct platform_driver usdhi6_driver = { 1894 .probe = usdhi6_probe, 1895 .remove = usdhi6_remove, 1896 .driver = { 1897 .name = "usdhi6rol0", 1898 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1899 .of_match_table = usdhi6_of_match, 1900 }, 1901}; 1902 1903module_platform_driver(usdhi6_driver); 1904 1905MODULE_DESCRIPTION("Renesas usdhi6rol0 SD/SDIO host driver"); 1906MODULE_LICENSE("GPL v2"); 1907MODULE_ALIAS("platform:usdhi6rol0"); 1908MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 1909