1 /* 2 * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver 3 * 4 * This is a driver for the SDHC controller found in Freescale MX2/MX3 5 * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c). 6 * Unlike the hardware found on MX1, this hardware just works and does 7 * not need all the quirks found in imxmmc.c, hence the separate driver. 8 * 9 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 10 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com> 11 * 12 * derived from pxamci.c by Russell King 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 as 16 * published by the Free Software Foundation. 17 * 18 */ 19 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/ioport.h> 23 #include <linux/platform_device.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/blkdev.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/mmc/host.h> 29 #include <linux/mmc/card.h> 30 #include <linux/delay.h> 31 #include <linux/clk.h> 32 #include <linux/io.h> 33 #include <linux/gpio.h> 34 #include <linux/regulator/consumer.h> 35 #include <linux/dmaengine.h> 36 37 #include <asm/dma.h> 38 #include <asm/irq.h> 39 #include <asm/sizes.h> 40 #include <mach/mmc.h> 41 42 #include <mach/dma.h> 43 #include <mach/hardware.h> 44 45 #define DRIVER_NAME "mxc-mmc" 46 47 #define MMC_REG_STR_STP_CLK 0x00 48 #define MMC_REG_STATUS 0x04 49 #define MMC_REG_CLK_RATE 0x08 50 #define MMC_REG_CMD_DAT_CONT 0x0C 51 #define MMC_REG_RES_TO 0x10 52 #define MMC_REG_READ_TO 0x14 53 #define MMC_REG_BLK_LEN 0x18 54 #define MMC_REG_NOB 0x1C 55 #define MMC_REG_REV_NO 0x20 56 #define MMC_REG_INT_CNTR 0x24 57 #define MMC_REG_CMD 0x28 58 #define MMC_REG_ARG 0x2C 59 #define MMC_REG_RES_FIFO 0x34 60 #define MMC_REG_BUFFER_ACCESS 0x38 61 62 #define STR_STP_CLK_RESET (1 << 3) 63 #define STR_STP_CLK_START_CLK (1 << 1) 64 #define STR_STP_CLK_STOP_CLK (1 << 0) 65 66 #define STATUS_CARD_INSERTION (1 << 31) 67 #define STATUS_CARD_REMOVAL (1 << 30) 68 #define STATUS_YBUF_EMPTY (1 << 29) 69 #define STATUS_XBUF_EMPTY (1 << 28) 70 #define STATUS_YBUF_FULL (1 << 27) 71 #define STATUS_XBUF_FULL (1 << 26) 72 #define STATUS_BUF_UND_RUN (1 << 25) 73 #define STATUS_BUF_OVFL (1 << 24) 74 #define STATUS_SDIO_INT_ACTIVE (1 << 14) 75 #define STATUS_END_CMD_RESP (1 << 13) 76 #define STATUS_WRITE_OP_DONE (1 << 12) 77 #define STATUS_DATA_TRANS_DONE (1 << 11) 78 #define STATUS_READ_OP_DONE (1 << 11) 79 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 80 #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 81 #define STATUS_BUF_READ_RDY (1 << 7) 82 #define STATUS_BUF_WRITE_RDY (1 << 6) 83 #define STATUS_RESP_CRC_ERR (1 << 5) 84 #define STATUS_CRC_READ_ERR (1 << 3) 85 #define STATUS_CRC_WRITE_ERR (1 << 2) 86 #define STATUS_TIME_OUT_RESP (1 << 1) 87 #define STATUS_TIME_OUT_READ (1 << 0) 88 #define STATUS_ERR_MASK 0x2f 89 90 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 91 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 92 #define CMD_DAT_CONT_START_READWAIT (1 << 10) 93 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 94 #define CMD_DAT_CONT_INIT (1 << 7) 95 #define CMD_DAT_CONT_WRITE (1 << 4) 96 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 97 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 98 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 99 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 100 101 #define INT_SDIO_INT_WKP_EN (1 << 18) 102 #define INT_CARD_INSERTION_WKP_EN (1 << 17) 103 #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 104 #define INT_CARD_INSERTION_EN (1 << 15) 105 #define INT_CARD_REMOVAL_EN (1 << 14) 106 #define INT_SDIO_IRQ_EN (1 << 13) 107 #define INT_DAT0_EN (1 << 12) 108 #define INT_BUF_READ_EN (1 << 4) 109 #define INT_BUF_WRITE_EN (1 << 3) 110 #define INT_END_CMD_RES_EN (1 << 2) 111 #define INT_WRITE_OP_DONE_EN (1 << 1) 112 #define INT_READ_OP_EN (1 << 0) 113 114 struct mxcmci_host { 115 struct mmc_host *mmc; 116 struct resource *res; 117 void __iomem *base; 118 int irq; 119 int detect_irq; 120 struct dma_chan *dma; 121 struct dma_async_tx_descriptor *desc; 122 int do_dma; 123 int default_irq_mask; 124 int use_sdio; 125 unsigned int power_mode; 126 struct imxmmc_platform_data *pdata; 127 128 struct mmc_request *req; 129 struct mmc_command *cmd; 130 struct mmc_data *data; 131 132 unsigned int datasize; 133 unsigned int dma_dir; 134 135 u16 rev_no; 136 unsigned int cmdat; 137 138 struct clk *clk; 139 140 int clock; 141 142 struct work_struct datawork; 143 spinlock_t lock; 144 145 struct regulator *vcc; 146 147 int burstlen; 148 int dmareq; 149 struct dma_slave_config dma_slave_config; 150 struct imx_dma_data dma_data; 151 }; 152 153 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 154 155 static inline void mxcmci_init_ocr(struct mxcmci_host *host) 156 { 157 host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc"); 158 159 if (IS_ERR(host->vcc)) { 160 host->vcc = NULL; 161 } else { 162 host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc); 163 if (host->pdata && host->pdata->ocr_avail) 164 dev_warn(mmc_dev(host->mmc), 165 "pdata->ocr_avail will not be used\n"); 166 } 167 168 if (host->vcc == NULL) { 169 /* fall-back to platform data */ 170 if (host->pdata && host->pdata->ocr_avail) 171 host->mmc->ocr_avail = host->pdata->ocr_avail; 172 else 173 host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 174 } 175 } 176 177 static inline void mxcmci_set_power(struct mxcmci_host *host, 178 unsigned char power_mode, 179 unsigned int vdd) 180 { 181 if (host->vcc) { 182 if (power_mode == MMC_POWER_UP) 183 mmc_regulator_set_ocr(host->mmc, host->vcc, vdd); 184 else if (power_mode == MMC_POWER_OFF) 185 mmc_regulator_set_ocr(host->mmc, host->vcc, 0); 186 } 187 188 if (host->pdata && host->pdata->setpower) 189 host->pdata->setpower(mmc_dev(host->mmc), vdd); 190 } 191 192 static inline int mxcmci_use_dma(struct mxcmci_host *host) 193 { 194 return host->do_dma; 195 } 196 197 static void mxcmci_softreset(struct mxcmci_host *host) 198 { 199 int i; 200 201 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 202 203 /* reset sequence */ 204 writew(STR_STP_CLK_RESET, host->base + MMC_REG_STR_STP_CLK); 205 writew(STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 206 host->base + MMC_REG_STR_STP_CLK); 207 208 for (i = 0; i < 8; i++) 209 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 210 211 writew(0xff, host->base + MMC_REG_RES_TO); 212 } 213 static int mxcmci_setup_dma(struct mmc_host *mmc); 214 215 static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 216 { 217 unsigned int nob = data->blocks; 218 unsigned int blksz = data->blksz; 219 unsigned int datasize = nob * blksz; 220 struct scatterlist *sg; 221 enum dma_transfer_direction slave_dirn; 222 int i, nents; 223 224 if (data->flags & MMC_DATA_STREAM) 225 nob = 0xffff; 226 227 host->data = data; 228 data->bytes_xfered = 0; 229 230 writew(nob, host->base + MMC_REG_NOB); 231 writew(blksz, host->base + MMC_REG_BLK_LEN); 232 host->datasize = datasize; 233 234 if (!mxcmci_use_dma(host)) 235 return 0; 236 237 for_each_sg(data->sg, sg, data->sg_len, i) { 238 if (sg->offset & 3 || sg->length & 3) { 239 host->do_dma = 0; 240 return 0; 241 } 242 } 243 244 if (data->flags & MMC_DATA_READ) { 245 host->dma_dir = DMA_FROM_DEVICE; 246 slave_dirn = DMA_DEV_TO_MEM; 247 } else { 248 host->dma_dir = DMA_TO_DEVICE; 249 slave_dirn = DMA_MEM_TO_DEV; 250 } 251 252 nents = dma_map_sg(host->dma->device->dev, data->sg, 253 data->sg_len, host->dma_dir); 254 if (nents != data->sg_len) 255 return -EINVAL; 256 257 host->desc = host->dma->device->device_prep_slave_sg(host->dma, 258 data->sg, data->sg_len, slave_dirn, 259 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 260 261 if (!host->desc) { 262 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 263 host->dma_dir); 264 host->do_dma = 0; 265 return 0; /* Fall back to PIO */ 266 } 267 wmb(); 268 269 dmaengine_submit(host->desc); 270 271 return 0; 272 } 273 274 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 275 unsigned int cmdat) 276 { 277 u32 int_cntr = host->default_irq_mask; 278 unsigned long flags; 279 280 WARN_ON(host->cmd != NULL); 281 host->cmd = cmd; 282 283 switch (mmc_resp_type(cmd)) { 284 case MMC_RSP_R1: /* short CRC, OPCODE */ 285 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 286 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 287 break; 288 case MMC_RSP_R2: /* long 136 bit + CRC */ 289 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 290 break; 291 case MMC_RSP_R3: /* short */ 292 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 293 break; 294 case MMC_RSP_NONE: 295 break; 296 default: 297 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 298 mmc_resp_type(cmd)); 299 cmd->error = -EINVAL; 300 return -EINVAL; 301 } 302 303 int_cntr = INT_END_CMD_RES_EN; 304 305 if (mxcmci_use_dma(host)) 306 int_cntr |= INT_READ_OP_EN | INT_WRITE_OP_DONE_EN; 307 308 spin_lock_irqsave(&host->lock, flags); 309 if (host->use_sdio) 310 int_cntr |= INT_SDIO_IRQ_EN; 311 writel(int_cntr, host->base + MMC_REG_INT_CNTR); 312 spin_unlock_irqrestore(&host->lock, flags); 313 314 writew(cmd->opcode, host->base + MMC_REG_CMD); 315 writel(cmd->arg, host->base + MMC_REG_ARG); 316 writew(cmdat, host->base + MMC_REG_CMD_DAT_CONT); 317 318 return 0; 319 } 320 321 static void mxcmci_finish_request(struct mxcmci_host *host, 322 struct mmc_request *req) 323 { 324 u32 int_cntr = host->default_irq_mask; 325 unsigned long flags; 326 327 spin_lock_irqsave(&host->lock, flags); 328 if (host->use_sdio) 329 int_cntr |= INT_SDIO_IRQ_EN; 330 writel(int_cntr, host->base + MMC_REG_INT_CNTR); 331 spin_unlock_irqrestore(&host->lock, flags); 332 333 host->req = NULL; 334 host->cmd = NULL; 335 host->data = NULL; 336 337 mmc_request_done(host->mmc, req); 338 } 339 340 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 341 { 342 struct mmc_data *data = host->data; 343 int data_error; 344 345 if (mxcmci_use_dma(host)) { 346 dmaengine_terminate_all(host->dma); 347 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 348 host->dma_dir); 349 } 350 351 if (stat & STATUS_ERR_MASK) { 352 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 353 stat); 354 if (stat & STATUS_CRC_READ_ERR) { 355 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 356 data->error = -EILSEQ; 357 } else if (stat & STATUS_CRC_WRITE_ERR) { 358 u32 err_code = (stat >> 9) & 0x3; 359 if (err_code == 2) { /* No CRC response */ 360 dev_err(mmc_dev(host->mmc), 361 "%s: No CRC -ETIMEDOUT\n", __func__); 362 data->error = -ETIMEDOUT; 363 } else { 364 dev_err(mmc_dev(host->mmc), 365 "%s: -EILSEQ\n", __func__); 366 data->error = -EILSEQ; 367 } 368 } else if (stat & STATUS_TIME_OUT_READ) { 369 dev_err(mmc_dev(host->mmc), 370 "%s: read -ETIMEDOUT\n", __func__); 371 data->error = -ETIMEDOUT; 372 } else { 373 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 374 data->error = -EIO; 375 } 376 } else { 377 data->bytes_xfered = host->datasize; 378 } 379 380 data_error = data->error; 381 382 host->data = NULL; 383 384 return data_error; 385 } 386 387 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 388 { 389 struct mmc_command *cmd = host->cmd; 390 int i; 391 u32 a, b, c; 392 393 if (!cmd) 394 return; 395 396 if (stat & STATUS_TIME_OUT_RESP) { 397 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 398 cmd->error = -ETIMEDOUT; 399 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 400 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 401 cmd->error = -EILSEQ; 402 } 403 404 if (cmd->flags & MMC_RSP_PRESENT) { 405 if (cmd->flags & MMC_RSP_136) { 406 for (i = 0; i < 4; i++) { 407 a = readw(host->base + MMC_REG_RES_FIFO); 408 b = readw(host->base + MMC_REG_RES_FIFO); 409 cmd->resp[i] = a << 16 | b; 410 } 411 } else { 412 a = readw(host->base + MMC_REG_RES_FIFO); 413 b = readw(host->base + MMC_REG_RES_FIFO); 414 c = readw(host->base + MMC_REG_RES_FIFO); 415 cmd->resp[0] = a << 24 | b << 8 | c >> 8; 416 } 417 } 418 } 419 420 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 421 { 422 u32 stat; 423 unsigned long timeout = jiffies + HZ; 424 425 do { 426 stat = readl(host->base + MMC_REG_STATUS); 427 if (stat & STATUS_ERR_MASK) 428 return stat; 429 if (time_after(jiffies, timeout)) { 430 mxcmci_softreset(host); 431 mxcmci_set_clk_rate(host, host->clock); 432 return STATUS_TIME_OUT_READ; 433 } 434 if (stat & mask) 435 return 0; 436 cpu_relax(); 437 } while (1); 438 } 439 440 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 441 { 442 unsigned int stat; 443 u32 *buf = _buf; 444 445 while (bytes > 3) { 446 stat = mxcmci_poll_status(host, 447 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 448 if (stat) 449 return stat; 450 *buf++ = readl(host->base + MMC_REG_BUFFER_ACCESS); 451 bytes -= 4; 452 } 453 454 if (bytes) { 455 u8 *b = (u8 *)buf; 456 u32 tmp; 457 458 stat = mxcmci_poll_status(host, 459 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 460 if (stat) 461 return stat; 462 tmp = readl(host->base + MMC_REG_BUFFER_ACCESS); 463 memcpy(b, &tmp, bytes); 464 } 465 466 return 0; 467 } 468 469 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 470 { 471 unsigned int stat; 472 u32 *buf = _buf; 473 474 while (bytes > 3) { 475 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 476 if (stat) 477 return stat; 478 writel(*buf++, host->base + MMC_REG_BUFFER_ACCESS); 479 bytes -= 4; 480 } 481 482 if (bytes) { 483 u8 *b = (u8 *)buf; 484 u32 tmp; 485 486 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 487 if (stat) 488 return stat; 489 490 memcpy(&tmp, b, bytes); 491 writel(tmp, host->base + MMC_REG_BUFFER_ACCESS); 492 } 493 494 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 495 if (stat) 496 return stat; 497 498 return 0; 499 } 500 501 static int mxcmci_transfer_data(struct mxcmci_host *host) 502 { 503 struct mmc_data *data = host->req->data; 504 struct scatterlist *sg; 505 int stat, i; 506 507 host->data = data; 508 host->datasize = 0; 509 510 if (data->flags & MMC_DATA_READ) { 511 for_each_sg(data->sg, sg, data->sg_len, i) { 512 stat = mxcmci_pull(host, sg_virt(sg), sg->length); 513 if (stat) 514 return stat; 515 host->datasize += sg->length; 516 } 517 } else { 518 for_each_sg(data->sg, sg, data->sg_len, i) { 519 stat = mxcmci_push(host, sg_virt(sg), sg->length); 520 if (stat) 521 return stat; 522 host->datasize += sg->length; 523 } 524 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 525 if (stat) 526 return stat; 527 } 528 return 0; 529 } 530 531 static void mxcmci_datawork(struct work_struct *work) 532 { 533 struct mxcmci_host *host = container_of(work, struct mxcmci_host, 534 datawork); 535 int datastat = mxcmci_transfer_data(host); 536 537 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 538 host->base + MMC_REG_STATUS); 539 mxcmci_finish_data(host, datastat); 540 541 if (host->req->stop) { 542 if (mxcmci_start_cmd(host, host->req->stop, 0)) { 543 mxcmci_finish_request(host, host->req); 544 return; 545 } 546 } else { 547 mxcmci_finish_request(host, host->req); 548 } 549 } 550 551 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 552 { 553 struct mmc_data *data = host->data; 554 int data_error; 555 556 if (!data) 557 return; 558 559 data_error = mxcmci_finish_data(host, stat); 560 561 mxcmci_read_response(host, stat); 562 host->cmd = NULL; 563 564 if (host->req->stop) { 565 if (mxcmci_start_cmd(host, host->req->stop, 0)) { 566 mxcmci_finish_request(host, host->req); 567 return; 568 } 569 } else { 570 mxcmci_finish_request(host, host->req); 571 } 572 } 573 574 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 575 { 576 mxcmci_read_response(host, stat); 577 host->cmd = NULL; 578 579 if (!host->data && host->req) { 580 mxcmci_finish_request(host, host->req); 581 return; 582 } 583 584 /* For the DMA case the DMA engine handles the data transfer 585 * automatically. For non DMA we have to do it ourselves. 586 * Don't do it in interrupt context though. 587 */ 588 if (!mxcmci_use_dma(host) && host->data) 589 schedule_work(&host->datawork); 590 591 } 592 593 static irqreturn_t mxcmci_irq(int irq, void *devid) 594 { 595 struct mxcmci_host *host = devid; 596 unsigned long flags; 597 bool sdio_irq; 598 u32 stat; 599 600 stat = readl(host->base + MMC_REG_STATUS); 601 writel(stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 602 STATUS_WRITE_OP_DONE), host->base + MMC_REG_STATUS); 603 604 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 605 606 spin_lock_irqsave(&host->lock, flags); 607 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 608 spin_unlock_irqrestore(&host->lock, flags); 609 610 if (mxcmci_use_dma(host) && 611 (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 612 writel(STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 613 host->base + MMC_REG_STATUS); 614 615 if (sdio_irq) { 616 writel(STATUS_SDIO_INT_ACTIVE, host->base + MMC_REG_STATUS); 617 mmc_signal_sdio_irq(host->mmc); 618 } 619 620 if (stat & STATUS_END_CMD_RESP) 621 mxcmci_cmd_done(host, stat); 622 623 if (mxcmci_use_dma(host) && 624 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) 625 mxcmci_data_done(host, stat); 626 627 if (host->default_irq_mask && 628 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL))) 629 mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 630 631 return IRQ_HANDLED; 632 } 633 634 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 635 { 636 struct mxcmci_host *host = mmc_priv(mmc); 637 unsigned int cmdat = host->cmdat; 638 int error; 639 640 WARN_ON(host->req != NULL); 641 642 host->req = req; 643 host->cmdat &= ~CMD_DAT_CONT_INIT; 644 645 if (host->dma) 646 host->do_dma = 1; 647 648 if (req->data) { 649 error = mxcmci_setup_data(host, req->data); 650 if (error) { 651 req->cmd->error = error; 652 goto out; 653 } 654 655 656 cmdat |= CMD_DAT_CONT_DATA_ENABLE; 657 658 if (req->data->flags & MMC_DATA_WRITE) 659 cmdat |= CMD_DAT_CONT_WRITE; 660 } 661 662 error = mxcmci_start_cmd(host, req->cmd, cmdat); 663 664 out: 665 if (error) 666 mxcmci_finish_request(host, req); 667 } 668 669 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 670 { 671 unsigned int divider; 672 int prescaler = 0; 673 unsigned int clk_in = clk_get_rate(host->clk); 674 675 while (prescaler <= 0x800) { 676 for (divider = 1; divider <= 0xF; divider++) { 677 int x; 678 679 x = (clk_in / (divider + 1)); 680 681 if (prescaler) 682 x /= (prescaler * 2); 683 684 if (x <= clk_ios) 685 break; 686 } 687 if (divider < 0x10) 688 break; 689 690 if (prescaler == 0) 691 prescaler = 1; 692 else 693 prescaler <<= 1; 694 } 695 696 writew((prescaler << 4) | divider, host->base + MMC_REG_CLK_RATE); 697 698 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 699 prescaler, divider, clk_in, clk_ios); 700 } 701 702 static int mxcmci_setup_dma(struct mmc_host *mmc) 703 { 704 struct mxcmci_host *host = mmc_priv(mmc); 705 struct dma_slave_config *config = &host->dma_slave_config; 706 707 config->dst_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 708 config->src_addr = host->res->start + MMC_REG_BUFFER_ACCESS; 709 config->dst_addr_width = 4; 710 config->src_addr_width = 4; 711 config->dst_maxburst = host->burstlen; 712 config->src_maxburst = host->burstlen; 713 714 return dmaengine_slave_config(host->dma, config); 715 } 716 717 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 718 { 719 struct mxcmci_host *host = mmc_priv(mmc); 720 int burstlen, ret; 721 722 /* 723 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0) 724 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16) 725 */ 726 if (ios->bus_width == MMC_BUS_WIDTH_4) 727 burstlen = 16; 728 else 729 burstlen = 4; 730 731 if (mxcmci_use_dma(host) && burstlen != host->burstlen) { 732 host->burstlen = burstlen; 733 ret = mxcmci_setup_dma(mmc); 734 if (ret) { 735 dev_err(mmc_dev(host->mmc), 736 "failed to config DMA channel. Falling back to PIO\n"); 737 dma_release_channel(host->dma); 738 host->do_dma = 0; 739 host->dma = NULL; 740 } 741 } 742 743 if (ios->bus_width == MMC_BUS_WIDTH_4) 744 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 745 else 746 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 747 748 if (host->power_mode != ios->power_mode) { 749 mxcmci_set_power(host, ios->power_mode, ios->vdd); 750 host->power_mode = ios->power_mode; 751 752 if (ios->power_mode == MMC_POWER_ON) 753 host->cmdat |= CMD_DAT_CONT_INIT; 754 } 755 756 if (ios->clock) { 757 mxcmci_set_clk_rate(host, ios->clock); 758 writew(STR_STP_CLK_START_CLK, host->base + MMC_REG_STR_STP_CLK); 759 } else { 760 writew(STR_STP_CLK_STOP_CLK, host->base + MMC_REG_STR_STP_CLK); 761 } 762 763 host->clock = ios->clock; 764 } 765 766 static irqreturn_t mxcmci_detect_irq(int irq, void *data) 767 { 768 struct mmc_host *mmc = data; 769 770 dev_dbg(mmc_dev(mmc), "%s\n", __func__); 771 772 mmc_detect_change(mmc, msecs_to_jiffies(250)); 773 return IRQ_HANDLED; 774 } 775 776 static int mxcmci_get_ro(struct mmc_host *mmc) 777 { 778 struct mxcmci_host *host = mmc_priv(mmc); 779 780 if (host->pdata && host->pdata->get_ro) 781 return !!host->pdata->get_ro(mmc_dev(mmc)); 782 /* 783 * Board doesn't support read only detection; let the mmc core 784 * decide what to do. 785 */ 786 return -ENOSYS; 787 } 788 789 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 790 { 791 struct mxcmci_host *host = mmc_priv(mmc); 792 unsigned long flags; 793 u32 int_cntr; 794 795 spin_lock_irqsave(&host->lock, flags); 796 host->use_sdio = enable; 797 int_cntr = readl(host->base + MMC_REG_INT_CNTR); 798 799 if (enable) 800 int_cntr |= INT_SDIO_IRQ_EN; 801 else 802 int_cntr &= ~INT_SDIO_IRQ_EN; 803 804 writel(int_cntr, host->base + MMC_REG_INT_CNTR); 805 spin_unlock_irqrestore(&host->lock, flags); 806 } 807 808 static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 809 { 810 /* 811 * MX3 SoCs have a silicon bug which corrupts CRC calculation of 812 * multi-block transfers when connected SDIO peripheral doesn't 813 * drive the BUSY line as required by the specs. 814 * One way to prevent this is to only allow 1-bit transfers. 815 */ 816 817 if (cpu_is_mx3() && card->type == MMC_TYPE_SDIO) 818 host->caps &= ~MMC_CAP_4_BIT_DATA; 819 else 820 host->caps |= MMC_CAP_4_BIT_DATA; 821 } 822 823 static bool filter(struct dma_chan *chan, void *param) 824 { 825 struct mxcmci_host *host = param; 826 827 if (!imx_dma_is_general_purpose(chan)) 828 return false; 829 830 chan->private = &host->dma_data; 831 832 return true; 833 } 834 835 static const struct mmc_host_ops mxcmci_ops = { 836 .request = mxcmci_request, 837 .set_ios = mxcmci_set_ios, 838 .get_ro = mxcmci_get_ro, 839 .enable_sdio_irq = mxcmci_enable_sdio_irq, 840 .init_card = mxcmci_init_card, 841 }; 842 843 static int mxcmci_probe(struct platform_device *pdev) 844 { 845 struct mmc_host *mmc; 846 struct mxcmci_host *host = NULL; 847 struct resource *iores, *r; 848 int ret = 0, irq; 849 dma_cap_mask_t mask; 850 851 pr_info("i.MX SDHC driver\n"); 852 853 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); 854 irq = platform_get_irq(pdev, 0); 855 if (!iores || irq < 0) 856 return -EINVAL; 857 858 r = request_mem_region(iores->start, resource_size(iores), pdev->name); 859 if (!r) 860 return -EBUSY; 861 862 mmc = mmc_alloc_host(sizeof(struct mxcmci_host), &pdev->dev); 863 if (!mmc) { 864 ret = -ENOMEM; 865 goto out_release_mem; 866 } 867 868 mmc->ops = &mxcmci_ops; 869 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 870 871 /* MMC core transfer sizes tunable parameters */ 872 mmc->max_segs = 64; 873 mmc->max_blk_size = 2048; 874 mmc->max_blk_count = 65535; 875 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 876 mmc->max_seg_size = mmc->max_req_size; 877 878 host = mmc_priv(mmc); 879 host->base = ioremap(r->start, resource_size(r)); 880 if (!host->base) { 881 ret = -ENOMEM; 882 goto out_free; 883 } 884 885 host->mmc = mmc; 886 host->pdata = pdev->dev.platform_data; 887 spin_lock_init(&host->lock); 888 889 mxcmci_init_ocr(host); 890 891 if (host->pdata && host->pdata->dat3_card_detect) 892 host->default_irq_mask = 893 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN; 894 else 895 host->default_irq_mask = 0; 896 897 host->res = r; 898 host->irq = irq; 899 900 host->clk = clk_get(&pdev->dev, NULL); 901 if (IS_ERR(host->clk)) { 902 ret = PTR_ERR(host->clk); 903 goto out_iounmap; 904 } 905 clk_enable(host->clk); 906 907 mxcmci_softreset(host); 908 909 host->rev_no = readw(host->base + MMC_REG_REV_NO); 910 if (host->rev_no != 0x400) { 911 ret = -ENODEV; 912 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 913 host->rev_no); 914 goto out_clk_put; 915 } 916 917 mmc->f_min = clk_get_rate(host->clk) >> 16; 918 mmc->f_max = clk_get_rate(host->clk) >> 1; 919 920 /* recommended in data sheet */ 921 writew(0x2db4, host->base + MMC_REG_READ_TO); 922 923 writel(host->default_irq_mask, host->base + MMC_REG_INT_CNTR); 924 925 r = platform_get_resource(pdev, IORESOURCE_DMA, 0); 926 if (r) { 927 host->dmareq = r->start; 928 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC; 929 host->dma_data.priority = DMA_PRIO_LOW; 930 host->dma_data.dma_request = host->dmareq; 931 dma_cap_zero(mask); 932 dma_cap_set(DMA_SLAVE, mask); 933 host->dma = dma_request_channel(mask, filter, host); 934 if (host->dma) 935 mmc->max_seg_size = dma_get_max_seg_size( 936 host->dma->device->dev); 937 } 938 939 if (!host->dma) 940 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n"); 941 942 INIT_WORK(&host->datawork, mxcmci_datawork); 943 944 ret = request_irq(host->irq, mxcmci_irq, 0, DRIVER_NAME, host); 945 if (ret) 946 goto out_free_dma; 947 948 platform_set_drvdata(pdev, mmc); 949 950 if (host->pdata && host->pdata->init) { 951 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 952 host->mmc); 953 if (ret) 954 goto out_free_irq; 955 } 956 957 mmc_add_host(mmc); 958 959 return 0; 960 961 out_free_irq: 962 free_irq(host->irq, host); 963 out_free_dma: 964 if (host->dma) 965 dma_release_channel(host->dma); 966 out_clk_put: 967 clk_disable(host->clk); 968 clk_put(host->clk); 969 out_iounmap: 970 iounmap(host->base); 971 out_free: 972 mmc_free_host(mmc); 973 out_release_mem: 974 release_mem_region(iores->start, resource_size(iores)); 975 return ret; 976 } 977 978 static int mxcmci_remove(struct platform_device *pdev) 979 { 980 struct mmc_host *mmc = platform_get_drvdata(pdev); 981 struct mxcmci_host *host = mmc_priv(mmc); 982 983 platform_set_drvdata(pdev, NULL); 984 985 mmc_remove_host(mmc); 986 987 if (host->vcc) 988 regulator_put(host->vcc); 989 990 if (host->pdata && host->pdata->exit) 991 host->pdata->exit(&pdev->dev, mmc); 992 993 free_irq(host->irq, host); 994 iounmap(host->base); 995 996 if (host->dma) 997 dma_release_channel(host->dma); 998 999 clk_disable(host->clk); 1000 clk_put(host->clk); 1001 1002 release_mem_region(host->res->start, resource_size(host->res)); 1003 1004 mmc_free_host(mmc); 1005 1006 return 0; 1007 } 1008 1009 #ifdef CONFIG_PM 1010 static int mxcmci_suspend(struct device *dev) 1011 { 1012 struct mmc_host *mmc = dev_get_drvdata(dev); 1013 struct mxcmci_host *host = mmc_priv(mmc); 1014 int ret = 0; 1015 1016 if (mmc) 1017 ret = mmc_suspend_host(mmc); 1018 clk_disable(host->clk); 1019 1020 return ret; 1021 } 1022 1023 static int mxcmci_resume(struct device *dev) 1024 { 1025 struct mmc_host *mmc = dev_get_drvdata(dev); 1026 struct mxcmci_host *host = mmc_priv(mmc); 1027 int ret = 0; 1028 1029 clk_enable(host->clk); 1030 if (mmc) 1031 ret = mmc_resume_host(mmc); 1032 1033 return ret; 1034 } 1035 1036 static const struct dev_pm_ops mxcmci_pm_ops = { 1037 .suspend = mxcmci_suspend, 1038 .resume = mxcmci_resume, 1039 }; 1040 #endif 1041 1042 static struct platform_driver mxcmci_driver = { 1043 .probe = mxcmci_probe, 1044 .remove = mxcmci_remove, 1045 .driver = { 1046 .name = DRIVER_NAME, 1047 .owner = THIS_MODULE, 1048 #ifdef CONFIG_PM 1049 .pm = &mxcmci_pm_ops, 1050 #endif 1051 } 1052 }; 1053 1054 module_platform_driver(mxcmci_driver); 1055 1056 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 1057 MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1058 MODULE_LICENSE("GPL"); 1059 MODULE_ALIAS("platform:imx-mmc"); 1060