1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/host/omap.c 4 * 5 * Copyright (C) 2004 Nokia Corporation 6 * Written by Tuukka Tikkanen and Juha Yrjölä<juha.yrjola@nokia.com> 7 * Misc hacks here and there by Tony Lindgren <tony@atomide.com> 8 * Other hacks (DMA, SD, etc) by David Brownell 9 */ 10 11 #include <linux/module.h> 12 #include <linux/moduleparam.h> 13 #include <linux/init.h> 14 #include <linux/ioport.h> 15 #include <linux/platform_device.h> 16 #include <linux/interrupt.h> 17 #include <linux/dmaengine.h> 18 #include <linux/dma-mapping.h> 19 #include <linux/delay.h> 20 #include <linux/spinlock.h> 21 #include <linux/timer.h> 22 #include <linux/of.h> 23 #include <linux/mmc/host.h> 24 #include <linux/mmc/card.h> 25 #include <linux/mmc/mmc.h> 26 #include <linux/clk.h> 27 #include <linux/scatterlist.h> 28 #include <linux/slab.h> 29 #include <linux/platform_data/mmc-omap.h> 30 31 32 #define OMAP_MMC_REG_CMD 0x00 33 #define OMAP_MMC_REG_ARGL 0x01 34 #define OMAP_MMC_REG_ARGH 0x02 35 #define OMAP_MMC_REG_CON 0x03 36 #define OMAP_MMC_REG_STAT 0x04 37 #define OMAP_MMC_REG_IE 0x05 38 #define OMAP_MMC_REG_CTO 0x06 39 #define OMAP_MMC_REG_DTO 0x07 40 #define OMAP_MMC_REG_DATA 0x08 41 #define OMAP_MMC_REG_BLEN 0x09 42 #define OMAP_MMC_REG_NBLK 0x0a 43 #define OMAP_MMC_REG_BUF 0x0b 44 #define OMAP_MMC_REG_SDIO 0x0d 45 #define OMAP_MMC_REG_REV 0x0f 46 #define OMAP_MMC_REG_RSP0 0x10 47 #define OMAP_MMC_REG_RSP1 0x11 48 #define OMAP_MMC_REG_RSP2 0x12 49 #define OMAP_MMC_REG_RSP3 0x13 50 #define OMAP_MMC_REG_RSP4 0x14 51 #define OMAP_MMC_REG_RSP5 0x15 52 #define OMAP_MMC_REG_RSP6 0x16 53 #define OMAP_MMC_REG_RSP7 0x17 54 #define OMAP_MMC_REG_IOSR 0x18 55 #define OMAP_MMC_REG_SYSC 0x19 56 #define OMAP_MMC_REG_SYSS 0x1a 57 58 #define OMAP_MMC_STAT_CARD_ERR (1 << 14) 59 #define OMAP_MMC_STAT_CARD_IRQ (1 << 13) 60 #define OMAP_MMC_STAT_OCR_BUSY (1 << 12) 61 #define OMAP_MMC_STAT_A_EMPTY (1 << 11) 62 #define OMAP_MMC_STAT_A_FULL (1 << 10) 63 #define OMAP_MMC_STAT_CMD_CRC (1 << 8) 64 #define OMAP_MMC_STAT_CMD_TOUT (1 << 7) 65 #define OMAP_MMC_STAT_DATA_CRC (1 << 6) 66 #define OMAP_MMC_STAT_DATA_TOUT (1 << 5) 67 #define OMAP_MMC_STAT_END_BUSY (1 << 4) 68 #define OMAP_MMC_STAT_END_OF_DATA (1 << 3) 69 #define OMAP_MMC_STAT_CARD_BUSY (1 << 2) 70 #define OMAP_MMC_STAT_END_OF_CMD (1 << 0) 71 72 #define mmc_omap7xx() (host->features & MMC_OMAP7XX) 73 #define mmc_omap15xx() (host->features & MMC_OMAP15XX) 74 #define mmc_omap16xx() (host->features & MMC_OMAP16XX) 75 #define MMC_OMAP1_MASK (MMC_OMAP7XX | MMC_OMAP15XX | MMC_OMAP16XX) 76 #define mmc_omap1() (host->features & MMC_OMAP1_MASK) 77 #define mmc_omap2() (!mmc_omap1()) 78 79 #define OMAP_MMC_REG(host, reg) (OMAP_MMC_REG_##reg << (host)->reg_shift) 80 #define OMAP_MMC_READ(host, reg) __raw_readw((host)->virt_base + OMAP_MMC_REG(host, reg)) 81 #define OMAP_MMC_WRITE(host, reg, val) __raw_writew((val), (host)->virt_base + OMAP_MMC_REG(host, reg)) 82 83 /* 84 * Command types 85 */ 86 #define OMAP_MMC_CMDTYPE_BC 0 87 #define OMAP_MMC_CMDTYPE_BCR 1 88 #define OMAP_MMC_CMDTYPE_AC 2 89 #define OMAP_MMC_CMDTYPE_ADTC 3 90 91 #define DRIVER_NAME "mmci-omap" 92 93 /* Specifies how often in millisecs to poll for card status changes 94 * when the cover switch is open */ 95 #define OMAP_MMC_COVER_POLL_DELAY 500 96 97 struct mmc_omap_host; 98 99 struct mmc_omap_slot { 100 int id; 101 unsigned int vdd; 102 u16 saved_con; 103 u16 bus_mode; 104 u16 power_mode; 105 unsigned int fclk_freq; 106 107 struct tasklet_struct cover_tasklet; 108 struct timer_list cover_timer; 109 unsigned cover_open; 110 111 struct mmc_request *mrq; 112 struct mmc_omap_host *host; 113 struct mmc_host *mmc; 114 struct omap_mmc_slot_data *pdata; 115 }; 116 117 struct mmc_omap_host { 118 int initialized; 119 struct mmc_request * mrq; 120 struct mmc_command * cmd; 121 struct mmc_data * data; 122 struct mmc_host * mmc; 123 struct device * dev; 124 unsigned char id; /* 16xx chips have 2 MMC blocks */ 125 struct clk * iclk; 126 struct clk * fclk; 127 struct dma_chan *dma_rx; 128 u32 dma_rx_burst; 129 struct dma_chan *dma_tx; 130 u32 dma_tx_burst; 131 void __iomem *virt_base; 132 unsigned int phys_base; 133 int irq; 134 unsigned char bus_mode; 135 unsigned int reg_shift; 136 137 struct work_struct cmd_abort_work; 138 unsigned abort:1; 139 struct timer_list cmd_abort_timer; 140 141 struct work_struct slot_release_work; 142 struct mmc_omap_slot *next_slot; 143 struct work_struct send_stop_work; 144 struct mmc_data *stop_data; 145 146 unsigned int sg_len; 147 int sg_idx; 148 u16 * buffer; 149 u32 buffer_bytes_left; 150 u32 total_bytes_left; 151 152 unsigned features; 153 unsigned brs_received:1, dma_done:1; 154 unsigned dma_in_use:1; 155 spinlock_t dma_lock; 156 157 struct mmc_omap_slot *slots[OMAP_MMC_MAX_SLOTS]; 158 struct mmc_omap_slot *current_slot; 159 spinlock_t slot_lock; 160 wait_queue_head_t slot_wq; 161 int nr_slots; 162 163 struct timer_list clk_timer; 164 spinlock_t clk_lock; /* for changing enabled state */ 165 unsigned int fclk_enabled:1; 166 struct workqueue_struct *mmc_omap_wq; 167 168 struct omap_mmc_platform_data *pdata; 169 }; 170 171 172 static void mmc_omap_fclk_offdelay(struct mmc_omap_slot *slot) 173 { 174 unsigned long tick_ns; 175 176 if (slot != NULL && slot->host->fclk_enabled && slot->fclk_freq > 0) { 177 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq); 178 ndelay(8 * tick_ns); 179 } 180 } 181 182 static void mmc_omap_fclk_enable(struct mmc_omap_host *host, unsigned int enable) 183 { 184 unsigned long flags; 185 186 spin_lock_irqsave(&host->clk_lock, flags); 187 if (host->fclk_enabled != enable) { 188 host->fclk_enabled = enable; 189 if (enable) 190 clk_enable(host->fclk); 191 else 192 clk_disable(host->fclk); 193 } 194 spin_unlock_irqrestore(&host->clk_lock, flags); 195 } 196 197 static void mmc_omap_select_slot(struct mmc_omap_slot *slot, int claimed) 198 { 199 struct mmc_omap_host *host = slot->host; 200 unsigned long flags; 201 202 if (claimed) 203 goto no_claim; 204 spin_lock_irqsave(&host->slot_lock, flags); 205 while (host->mmc != NULL) { 206 spin_unlock_irqrestore(&host->slot_lock, flags); 207 wait_event(host->slot_wq, host->mmc == NULL); 208 spin_lock_irqsave(&host->slot_lock, flags); 209 } 210 host->mmc = slot->mmc; 211 spin_unlock_irqrestore(&host->slot_lock, flags); 212 no_claim: 213 del_timer(&host->clk_timer); 214 if (host->current_slot != slot || !claimed) 215 mmc_omap_fclk_offdelay(host->current_slot); 216 217 if (host->current_slot != slot) { 218 OMAP_MMC_WRITE(host, CON, slot->saved_con & 0xFC00); 219 if (host->pdata->switch_slot != NULL) 220 host->pdata->switch_slot(mmc_dev(slot->mmc), slot->id); 221 host->current_slot = slot; 222 } 223 224 if (claimed) { 225 mmc_omap_fclk_enable(host, 1); 226 227 /* Doing the dummy read here seems to work around some bug 228 * at least in OMAP24xx silicon where the command would not 229 * start after writing the CMD register. Sigh. */ 230 OMAP_MMC_READ(host, CON); 231 232 OMAP_MMC_WRITE(host, CON, slot->saved_con); 233 } else 234 mmc_omap_fclk_enable(host, 0); 235 } 236 237 static void mmc_omap_start_request(struct mmc_omap_host *host, 238 struct mmc_request *req); 239 240 static void mmc_omap_slot_release_work(struct work_struct *work) 241 { 242 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, 243 slot_release_work); 244 struct mmc_omap_slot *next_slot = host->next_slot; 245 struct mmc_request *rq; 246 247 host->next_slot = NULL; 248 mmc_omap_select_slot(next_slot, 1); 249 250 rq = next_slot->mrq; 251 next_slot->mrq = NULL; 252 mmc_omap_start_request(host, rq); 253 } 254 255 static void mmc_omap_release_slot(struct mmc_omap_slot *slot, int clk_enabled) 256 { 257 struct mmc_omap_host *host = slot->host; 258 unsigned long flags; 259 int i; 260 261 BUG_ON(slot == NULL || host->mmc == NULL); 262 263 if (clk_enabled) 264 /* Keeps clock running for at least 8 cycles on valid freq */ 265 mod_timer(&host->clk_timer, jiffies + HZ/10); 266 else { 267 del_timer(&host->clk_timer); 268 mmc_omap_fclk_offdelay(slot); 269 mmc_omap_fclk_enable(host, 0); 270 } 271 272 spin_lock_irqsave(&host->slot_lock, flags); 273 /* Check for any pending requests */ 274 for (i = 0; i < host->nr_slots; i++) { 275 struct mmc_omap_slot *new_slot; 276 277 if (host->slots[i] == NULL || host->slots[i]->mrq == NULL) 278 continue; 279 280 BUG_ON(host->next_slot != NULL); 281 new_slot = host->slots[i]; 282 /* The current slot should not have a request in queue */ 283 BUG_ON(new_slot == host->current_slot); 284 285 host->next_slot = new_slot; 286 host->mmc = new_slot->mmc; 287 spin_unlock_irqrestore(&host->slot_lock, flags); 288 queue_work(host->mmc_omap_wq, &host->slot_release_work); 289 return; 290 } 291 292 host->mmc = NULL; 293 wake_up(&host->slot_wq); 294 spin_unlock_irqrestore(&host->slot_lock, flags); 295 } 296 297 static inline 298 int mmc_omap_cover_is_open(struct mmc_omap_slot *slot) 299 { 300 if (slot->pdata->get_cover_state) 301 return slot->pdata->get_cover_state(mmc_dev(slot->mmc), 302 slot->id); 303 return 0; 304 } 305 306 static ssize_t 307 mmc_omap_show_cover_switch(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); 311 struct mmc_omap_slot *slot = mmc_priv(mmc); 312 313 return sprintf(buf, "%s\n", mmc_omap_cover_is_open(slot) ? "open" : 314 "closed"); 315 } 316 317 static DEVICE_ATTR(cover_switch, S_IRUGO, mmc_omap_show_cover_switch, NULL); 318 319 static ssize_t 320 mmc_omap_show_slot_name(struct device *dev, struct device_attribute *attr, 321 char *buf) 322 { 323 struct mmc_host *mmc = container_of(dev, struct mmc_host, class_dev); 324 struct mmc_omap_slot *slot = mmc_priv(mmc); 325 326 return sprintf(buf, "%s\n", slot->pdata->name); 327 } 328 329 static DEVICE_ATTR(slot_name, S_IRUGO, mmc_omap_show_slot_name, NULL); 330 331 static void 332 mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd) 333 { 334 u32 cmdreg; 335 u32 resptype; 336 u32 cmdtype; 337 u16 irq_mask; 338 339 host->cmd = cmd; 340 341 resptype = 0; 342 cmdtype = 0; 343 344 /* Our hardware needs to know exact type */ 345 switch (mmc_resp_type(cmd)) { 346 case MMC_RSP_NONE: 347 break; 348 case MMC_RSP_R1: 349 case MMC_RSP_R1B: 350 /* resp 1, 1b, 6, 7 */ 351 resptype = 1; 352 break; 353 case MMC_RSP_R2: 354 resptype = 2; 355 break; 356 case MMC_RSP_R3: 357 resptype = 3; 358 break; 359 default: 360 dev_err(mmc_dev(host->mmc), "Invalid response type: %04x\n", mmc_resp_type(cmd)); 361 break; 362 } 363 364 if (mmc_cmd_type(cmd) == MMC_CMD_ADTC) { 365 cmdtype = OMAP_MMC_CMDTYPE_ADTC; 366 } else if (mmc_cmd_type(cmd) == MMC_CMD_BC) { 367 cmdtype = OMAP_MMC_CMDTYPE_BC; 368 } else if (mmc_cmd_type(cmd) == MMC_CMD_BCR) { 369 cmdtype = OMAP_MMC_CMDTYPE_BCR; 370 } else { 371 cmdtype = OMAP_MMC_CMDTYPE_AC; 372 } 373 374 cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12); 375 376 if (host->current_slot->bus_mode == MMC_BUSMODE_OPENDRAIN) 377 cmdreg |= 1 << 6; 378 379 if (cmd->flags & MMC_RSP_BUSY) 380 cmdreg |= 1 << 11; 381 382 if (host->data && !(host->data->flags & MMC_DATA_WRITE)) 383 cmdreg |= 1 << 15; 384 385 mod_timer(&host->cmd_abort_timer, jiffies + HZ/2); 386 387 OMAP_MMC_WRITE(host, CTO, 200); 388 OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff); 389 OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16); 390 irq_mask = OMAP_MMC_STAT_A_EMPTY | OMAP_MMC_STAT_A_FULL | 391 OMAP_MMC_STAT_CMD_CRC | OMAP_MMC_STAT_CMD_TOUT | 392 OMAP_MMC_STAT_DATA_CRC | OMAP_MMC_STAT_DATA_TOUT | 393 OMAP_MMC_STAT_END_OF_CMD | OMAP_MMC_STAT_CARD_ERR | 394 OMAP_MMC_STAT_END_OF_DATA; 395 if (cmd->opcode == MMC_ERASE) 396 irq_mask &= ~OMAP_MMC_STAT_DATA_TOUT; 397 OMAP_MMC_WRITE(host, IE, irq_mask); 398 OMAP_MMC_WRITE(host, CMD, cmdreg); 399 } 400 401 static void 402 mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data, 403 int abort) 404 { 405 enum dma_data_direction dma_data_dir; 406 struct device *dev = mmc_dev(host->mmc); 407 struct dma_chan *c; 408 409 if (data->flags & MMC_DATA_WRITE) { 410 dma_data_dir = DMA_TO_DEVICE; 411 c = host->dma_tx; 412 } else { 413 dma_data_dir = DMA_FROM_DEVICE; 414 c = host->dma_rx; 415 } 416 if (c) { 417 if (data->error) { 418 dmaengine_terminate_all(c); 419 /* Claim nothing transferred on error... */ 420 data->bytes_xfered = 0; 421 } 422 dev = c->device->dev; 423 } 424 dma_unmap_sg(dev, data->sg, host->sg_len, dma_data_dir); 425 } 426 427 static void mmc_omap_send_stop_work(struct work_struct *work) 428 { 429 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, 430 send_stop_work); 431 struct mmc_omap_slot *slot = host->current_slot; 432 struct mmc_data *data = host->stop_data; 433 unsigned long tick_ns; 434 435 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, slot->fclk_freq); 436 ndelay(8*tick_ns); 437 438 mmc_omap_start_command(host, data->stop); 439 } 440 441 static void 442 mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data) 443 { 444 if (host->dma_in_use) 445 mmc_omap_release_dma(host, data, data->error); 446 447 host->data = NULL; 448 host->sg_len = 0; 449 450 /* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing 451 * dozens of requests until the card finishes writing data. 452 * It'd be cheaper to just wait till an EOFB interrupt arrives... 453 */ 454 455 if (!data->stop) { 456 struct mmc_host *mmc; 457 458 host->mrq = NULL; 459 mmc = host->mmc; 460 mmc_omap_release_slot(host->current_slot, 1); 461 mmc_request_done(mmc, data->mrq); 462 return; 463 } 464 465 host->stop_data = data; 466 queue_work(host->mmc_omap_wq, &host->send_stop_work); 467 } 468 469 static void 470 mmc_omap_send_abort(struct mmc_omap_host *host, int maxloops) 471 { 472 struct mmc_omap_slot *slot = host->current_slot; 473 unsigned int restarts, passes, timeout; 474 u16 stat = 0; 475 476 /* Sending abort takes 80 clocks. Have some extra and round up */ 477 timeout = DIV_ROUND_UP(120 * USEC_PER_SEC, slot->fclk_freq); 478 restarts = 0; 479 while (restarts < maxloops) { 480 OMAP_MMC_WRITE(host, STAT, 0xFFFF); 481 OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7)); 482 483 passes = 0; 484 while (passes < timeout) { 485 stat = OMAP_MMC_READ(host, STAT); 486 if (stat & OMAP_MMC_STAT_END_OF_CMD) 487 goto out; 488 udelay(1); 489 passes++; 490 } 491 492 restarts++; 493 } 494 out: 495 OMAP_MMC_WRITE(host, STAT, stat); 496 } 497 498 static void 499 mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data) 500 { 501 if (host->dma_in_use) 502 mmc_omap_release_dma(host, data, 1); 503 504 host->data = NULL; 505 host->sg_len = 0; 506 507 mmc_omap_send_abort(host, 10000); 508 } 509 510 static void 511 mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data) 512 { 513 unsigned long flags; 514 int done; 515 516 if (!host->dma_in_use) { 517 mmc_omap_xfer_done(host, data); 518 return; 519 } 520 done = 0; 521 spin_lock_irqsave(&host->dma_lock, flags); 522 if (host->dma_done) 523 done = 1; 524 else 525 host->brs_received = 1; 526 spin_unlock_irqrestore(&host->dma_lock, flags); 527 if (done) 528 mmc_omap_xfer_done(host, data); 529 } 530 531 static void 532 mmc_omap_dma_done(struct mmc_omap_host *host, struct mmc_data *data) 533 { 534 unsigned long flags; 535 int done; 536 537 done = 0; 538 spin_lock_irqsave(&host->dma_lock, flags); 539 if (host->brs_received) 540 done = 1; 541 else 542 host->dma_done = 1; 543 spin_unlock_irqrestore(&host->dma_lock, flags); 544 if (done) 545 mmc_omap_xfer_done(host, data); 546 } 547 548 static void 549 mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) 550 { 551 host->cmd = NULL; 552 553 del_timer(&host->cmd_abort_timer); 554 555 if (cmd->flags & MMC_RSP_PRESENT) { 556 if (cmd->flags & MMC_RSP_136) { 557 /* response type 2 */ 558 cmd->resp[3] = 559 OMAP_MMC_READ(host, RSP0) | 560 (OMAP_MMC_READ(host, RSP1) << 16); 561 cmd->resp[2] = 562 OMAP_MMC_READ(host, RSP2) | 563 (OMAP_MMC_READ(host, RSP3) << 16); 564 cmd->resp[1] = 565 OMAP_MMC_READ(host, RSP4) | 566 (OMAP_MMC_READ(host, RSP5) << 16); 567 cmd->resp[0] = 568 OMAP_MMC_READ(host, RSP6) | 569 (OMAP_MMC_READ(host, RSP7) << 16); 570 } else { 571 /* response types 1, 1b, 3, 4, 5, 6 */ 572 cmd->resp[0] = 573 OMAP_MMC_READ(host, RSP6) | 574 (OMAP_MMC_READ(host, RSP7) << 16); 575 } 576 } 577 578 if (host->data == NULL || cmd->error) { 579 struct mmc_host *mmc; 580 581 if (host->data != NULL) 582 mmc_omap_abort_xfer(host, host->data); 583 host->mrq = NULL; 584 mmc = host->mmc; 585 mmc_omap_release_slot(host->current_slot, 1); 586 mmc_request_done(mmc, cmd->mrq); 587 } 588 } 589 590 /* 591 * Abort stuck command. Can occur when card is removed while it is being 592 * read. 593 */ 594 static void mmc_omap_abort_command(struct work_struct *work) 595 { 596 struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, 597 cmd_abort_work); 598 BUG_ON(!host->cmd); 599 600 dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n", 601 host->cmd->opcode); 602 603 if (host->cmd->error == 0) 604 host->cmd->error = -ETIMEDOUT; 605 606 if (host->data == NULL) { 607 struct mmc_command *cmd; 608 struct mmc_host *mmc; 609 610 cmd = host->cmd; 611 host->cmd = NULL; 612 mmc_omap_send_abort(host, 10000); 613 614 host->mrq = NULL; 615 mmc = host->mmc; 616 mmc_omap_release_slot(host->current_slot, 1); 617 mmc_request_done(mmc, cmd->mrq); 618 } else 619 mmc_omap_cmd_done(host, host->cmd); 620 621 host->abort = 0; 622 enable_irq(host->irq); 623 } 624 625 static void 626 mmc_omap_cmd_timer(struct timer_list *t) 627 { 628 struct mmc_omap_host *host = from_timer(host, t, cmd_abort_timer); 629 unsigned long flags; 630 631 spin_lock_irqsave(&host->slot_lock, flags); 632 if (host->cmd != NULL && !host->abort) { 633 OMAP_MMC_WRITE(host, IE, 0); 634 disable_irq(host->irq); 635 host->abort = 1; 636 queue_work(host->mmc_omap_wq, &host->cmd_abort_work); 637 } 638 spin_unlock_irqrestore(&host->slot_lock, flags); 639 } 640 641 /* PIO only */ 642 static void 643 mmc_omap_sg_to_buf(struct mmc_omap_host *host) 644 { 645 struct scatterlist *sg; 646 647 sg = host->data->sg + host->sg_idx; 648 host->buffer_bytes_left = sg->length; 649 host->buffer = sg_virt(sg); 650 if (host->buffer_bytes_left > host->total_bytes_left) 651 host->buffer_bytes_left = host->total_bytes_left; 652 } 653 654 static void 655 mmc_omap_clk_timer(struct timer_list *t) 656 { 657 struct mmc_omap_host *host = from_timer(host, t, clk_timer); 658 659 mmc_omap_fclk_enable(host, 0); 660 } 661 662 /* PIO only */ 663 static void 664 mmc_omap_xfer_data(struct mmc_omap_host *host, int write) 665 { 666 int n, nwords; 667 668 if (host->buffer_bytes_left == 0) { 669 host->sg_idx++; 670 BUG_ON(host->sg_idx == host->sg_len); 671 mmc_omap_sg_to_buf(host); 672 } 673 n = 64; 674 if (n > host->buffer_bytes_left) 675 n = host->buffer_bytes_left; 676 677 /* Round up to handle odd number of bytes to transfer */ 678 nwords = DIV_ROUND_UP(n, 2); 679 680 host->buffer_bytes_left -= n; 681 host->total_bytes_left -= n; 682 host->data->bytes_xfered += n; 683 684 if (write) { 685 __raw_writesw(host->virt_base + OMAP_MMC_REG(host, DATA), 686 host->buffer, nwords); 687 } else { 688 __raw_readsw(host->virt_base + OMAP_MMC_REG(host, DATA), 689 host->buffer, nwords); 690 } 691 692 host->buffer += nwords; 693 } 694 695 #ifdef CONFIG_MMC_DEBUG 696 static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status) 697 { 698 static const char *mmc_omap_status_bits[] = { 699 "EOC", "CD", "CB", "BRS", "EOFB", "DTO", "DCRC", "CTO", 700 "CCRC", "CRW", "AF", "AE", "OCRB", "CIRQ", "CERR" 701 }; 702 int i; 703 char res[64], *buf = res; 704 705 buf += sprintf(buf, "MMC IRQ 0x%x:", status); 706 707 for (i = 0; i < ARRAY_SIZE(mmc_omap_status_bits); i++) 708 if (status & (1 << i)) 709 buf += sprintf(buf, " %s", mmc_omap_status_bits[i]); 710 dev_vdbg(mmc_dev(host->mmc), "%s\n", res); 711 } 712 #else 713 static void mmc_omap_report_irq(struct mmc_omap_host *host, u16 status) 714 { 715 } 716 #endif 717 718 719 static irqreturn_t mmc_omap_irq(int irq, void *dev_id) 720 { 721 struct mmc_omap_host * host = (struct mmc_omap_host *)dev_id; 722 u16 status; 723 int end_command; 724 int end_transfer; 725 int transfer_error, cmd_error; 726 727 if (host->cmd == NULL && host->data == NULL) { 728 status = OMAP_MMC_READ(host, STAT); 729 dev_info(mmc_dev(host->slots[0]->mmc), 730 "Spurious IRQ 0x%04x\n", status); 731 if (status != 0) { 732 OMAP_MMC_WRITE(host, STAT, status); 733 OMAP_MMC_WRITE(host, IE, 0); 734 } 735 return IRQ_HANDLED; 736 } 737 738 end_command = 0; 739 end_transfer = 0; 740 transfer_error = 0; 741 cmd_error = 0; 742 743 while ((status = OMAP_MMC_READ(host, STAT)) != 0) { 744 int cmd; 745 746 OMAP_MMC_WRITE(host, STAT, status); 747 if (host->cmd != NULL) 748 cmd = host->cmd->opcode; 749 else 750 cmd = -1; 751 dev_dbg(mmc_dev(host->mmc), "MMC IRQ %04x (CMD %d): ", 752 status, cmd); 753 mmc_omap_report_irq(host, status); 754 755 if (host->total_bytes_left) { 756 if ((status & OMAP_MMC_STAT_A_FULL) || 757 (status & OMAP_MMC_STAT_END_OF_DATA)) 758 mmc_omap_xfer_data(host, 0); 759 if (status & OMAP_MMC_STAT_A_EMPTY) 760 mmc_omap_xfer_data(host, 1); 761 } 762 763 if (status & OMAP_MMC_STAT_END_OF_DATA) 764 end_transfer = 1; 765 766 if (status & OMAP_MMC_STAT_DATA_TOUT) { 767 dev_dbg(mmc_dev(host->mmc), "data timeout (CMD%d)\n", 768 cmd); 769 if (host->data) { 770 host->data->error = -ETIMEDOUT; 771 transfer_error = 1; 772 } 773 } 774 775 if (status & OMAP_MMC_STAT_DATA_CRC) { 776 if (host->data) { 777 host->data->error = -EILSEQ; 778 dev_dbg(mmc_dev(host->mmc), 779 "data CRC error, bytes left %d\n", 780 host->total_bytes_left); 781 transfer_error = 1; 782 } else { 783 dev_dbg(mmc_dev(host->mmc), "data CRC error\n"); 784 } 785 } 786 787 if (status & OMAP_MMC_STAT_CMD_TOUT) { 788 /* Timeouts are routine with some commands */ 789 if (host->cmd) { 790 struct mmc_omap_slot *slot = 791 host->current_slot; 792 if (slot == NULL || 793 !mmc_omap_cover_is_open(slot)) 794 dev_err(mmc_dev(host->mmc), 795 "command timeout (CMD%d)\n", 796 cmd); 797 host->cmd->error = -ETIMEDOUT; 798 end_command = 1; 799 cmd_error = 1; 800 } 801 } 802 803 if (status & OMAP_MMC_STAT_CMD_CRC) { 804 if (host->cmd) { 805 dev_err(mmc_dev(host->mmc), 806 "command CRC error (CMD%d, arg 0x%08x)\n", 807 cmd, host->cmd->arg); 808 host->cmd->error = -EILSEQ; 809 end_command = 1; 810 cmd_error = 1; 811 } else 812 dev_err(mmc_dev(host->mmc), 813 "command CRC error without cmd?\n"); 814 } 815 816 if (status & OMAP_MMC_STAT_CARD_ERR) { 817 dev_dbg(mmc_dev(host->mmc), 818 "ignoring card status error (CMD%d)\n", 819 cmd); 820 end_command = 1; 821 } 822 823 /* 824 * NOTE: On 1610 the END_OF_CMD may come too early when 825 * starting a write 826 */ 827 if ((status & OMAP_MMC_STAT_END_OF_CMD) && 828 (!(status & OMAP_MMC_STAT_A_EMPTY))) { 829 end_command = 1; 830 } 831 } 832 833 if (cmd_error && host->data) { 834 del_timer(&host->cmd_abort_timer); 835 host->abort = 1; 836 OMAP_MMC_WRITE(host, IE, 0); 837 disable_irq_nosync(host->irq); 838 queue_work(host->mmc_omap_wq, &host->cmd_abort_work); 839 return IRQ_HANDLED; 840 } 841 842 if (end_command && host->cmd) 843 mmc_omap_cmd_done(host, host->cmd); 844 if (host->data != NULL) { 845 if (transfer_error) 846 mmc_omap_xfer_done(host, host->data); 847 else if (end_transfer) 848 mmc_omap_end_of_data(host, host->data); 849 } 850 851 return IRQ_HANDLED; 852 } 853 854 void omap_mmc_notify_cover_event(struct device *dev, int num, int is_closed) 855 { 856 int cover_open; 857 struct mmc_omap_host *host = dev_get_drvdata(dev); 858 struct mmc_omap_slot *slot = host->slots[num]; 859 860 BUG_ON(num >= host->nr_slots); 861 862 /* Other subsystems can call in here before we're initialised. */ 863 if (host->nr_slots == 0 || !host->slots[num]) 864 return; 865 866 cover_open = mmc_omap_cover_is_open(slot); 867 if (cover_open != slot->cover_open) { 868 slot->cover_open = cover_open; 869 sysfs_notify(&slot->mmc->class_dev.kobj, NULL, "cover_switch"); 870 } 871 872 tasklet_hi_schedule(&slot->cover_tasklet); 873 } 874 875 static void mmc_omap_cover_timer(struct timer_list *t) 876 { 877 struct mmc_omap_slot *slot = from_timer(slot, t, cover_timer); 878 tasklet_schedule(&slot->cover_tasklet); 879 } 880 881 static void mmc_omap_cover_handler(unsigned long param) 882 { 883 struct mmc_omap_slot *slot = (struct mmc_omap_slot *)param; 884 int cover_open = mmc_omap_cover_is_open(slot); 885 886 mmc_detect_change(slot->mmc, 0); 887 if (!cover_open) 888 return; 889 890 /* 891 * If no card is inserted, we postpone polling until 892 * the cover has been closed. 893 */ 894 if (slot->mmc->card == NULL) 895 return; 896 897 mod_timer(&slot->cover_timer, 898 jiffies + msecs_to_jiffies(OMAP_MMC_COVER_POLL_DELAY)); 899 } 900 901 static void mmc_omap_dma_callback(void *priv) 902 { 903 struct mmc_omap_host *host = priv; 904 struct mmc_data *data = host->data; 905 906 /* If we got to the end of DMA, assume everything went well */ 907 data->bytes_xfered += data->blocks * data->blksz; 908 909 mmc_omap_dma_done(host, data); 910 } 911 912 static inline void set_cmd_timeout(struct mmc_omap_host *host, struct mmc_request *req) 913 { 914 u16 reg; 915 916 reg = OMAP_MMC_READ(host, SDIO); 917 reg &= ~(1 << 5); 918 OMAP_MMC_WRITE(host, SDIO, reg); 919 /* Set maximum timeout */ 920 OMAP_MMC_WRITE(host, CTO, 0xfd); 921 } 922 923 static inline void set_data_timeout(struct mmc_omap_host *host, struct mmc_request *req) 924 { 925 unsigned int timeout, cycle_ns; 926 u16 reg; 927 928 cycle_ns = 1000000000 / host->current_slot->fclk_freq; 929 timeout = req->data->timeout_ns / cycle_ns; 930 timeout += req->data->timeout_clks; 931 932 /* Check if we need to use timeout multiplier register */ 933 reg = OMAP_MMC_READ(host, SDIO); 934 if (timeout > 0xffff) { 935 reg |= (1 << 5); 936 timeout /= 1024; 937 } else 938 reg &= ~(1 << 5); 939 OMAP_MMC_WRITE(host, SDIO, reg); 940 OMAP_MMC_WRITE(host, DTO, timeout); 941 } 942 943 static void 944 mmc_omap_prepare_data(struct mmc_omap_host *host, struct mmc_request *req) 945 { 946 struct mmc_data *data = req->data; 947 int i, use_dma = 1, block_size; 948 struct scatterlist *sg; 949 unsigned sg_len; 950 951 host->data = data; 952 if (data == NULL) { 953 OMAP_MMC_WRITE(host, BLEN, 0); 954 OMAP_MMC_WRITE(host, NBLK, 0); 955 OMAP_MMC_WRITE(host, BUF, 0); 956 host->dma_in_use = 0; 957 set_cmd_timeout(host, req); 958 return; 959 } 960 961 block_size = data->blksz; 962 963 OMAP_MMC_WRITE(host, NBLK, data->blocks - 1); 964 OMAP_MMC_WRITE(host, BLEN, block_size - 1); 965 set_data_timeout(host, req); 966 967 /* cope with calling layer confusion; it issues "single 968 * block" writes using multi-block scatterlists. 969 */ 970 sg_len = (data->blocks == 1) ? 1 : data->sg_len; 971 972 /* Only do DMA for entire blocks */ 973 for_each_sg(data->sg, sg, sg_len, i) { 974 if ((sg->length % block_size) != 0) { 975 use_dma = 0; 976 break; 977 } 978 } 979 980 host->sg_idx = 0; 981 if (use_dma) { 982 enum dma_data_direction dma_data_dir; 983 struct dma_async_tx_descriptor *tx; 984 struct dma_chan *c; 985 u32 burst, *bp; 986 u16 buf; 987 988 /* 989 * FIFO is 16x2 bytes on 15xx, and 32x2 bytes on 16xx 990 * and 24xx. Use 16 or 32 word frames when the 991 * blocksize is at least that large. Blocksize is 992 * usually 512 bytes; but not for some SD reads. 993 */ 994 burst = mmc_omap15xx() ? 32 : 64; 995 if (burst > data->blksz) 996 burst = data->blksz; 997 998 burst >>= 1; 999 1000 if (data->flags & MMC_DATA_WRITE) { 1001 c = host->dma_tx; 1002 bp = &host->dma_tx_burst; 1003 buf = 0x0f80 | (burst - 1) << 0; 1004 dma_data_dir = DMA_TO_DEVICE; 1005 } else { 1006 c = host->dma_rx; 1007 bp = &host->dma_rx_burst; 1008 buf = 0x800f | (burst - 1) << 8; 1009 dma_data_dir = DMA_FROM_DEVICE; 1010 } 1011 1012 if (!c) 1013 goto use_pio; 1014 1015 /* Only reconfigure if we have a different burst size */ 1016 if (*bp != burst) { 1017 struct dma_slave_config cfg = { 1018 .src_addr = host->phys_base + 1019 OMAP_MMC_REG(host, DATA), 1020 .dst_addr = host->phys_base + 1021 OMAP_MMC_REG(host, DATA), 1022 .src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES, 1023 .dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES, 1024 .src_maxburst = burst, 1025 .dst_maxburst = burst, 1026 }; 1027 1028 if (dmaengine_slave_config(c, &cfg)) 1029 goto use_pio; 1030 1031 *bp = burst; 1032 } 1033 1034 host->sg_len = dma_map_sg(c->device->dev, data->sg, sg_len, 1035 dma_data_dir); 1036 if (host->sg_len == 0) 1037 goto use_pio; 1038 1039 tx = dmaengine_prep_slave_sg(c, data->sg, host->sg_len, 1040 data->flags & MMC_DATA_WRITE ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, 1041 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 1042 if (!tx) 1043 goto use_pio; 1044 1045 OMAP_MMC_WRITE(host, BUF, buf); 1046 1047 tx->callback = mmc_omap_dma_callback; 1048 tx->callback_param = host; 1049 dmaengine_submit(tx); 1050 host->brs_received = 0; 1051 host->dma_done = 0; 1052 host->dma_in_use = 1; 1053 return; 1054 } 1055 use_pio: 1056 1057 /* Revert to PIO? */ 1058 OMAP_MMC_WRITE(host, BUF, 0x1f1f); 1059 host->total_bytes_left = data->blocks * block_size; 1060 host->sg_len = sg_len; 1061 mmc_omap_sg_to_buf(host); 1062 host->dma_in_use = 0; 1063 } 1064 1065 static void mmc_omap_start_request(struct mmc_omap_host *host, 1066 struct mmc_request *req) 1067 { 1068 BUG_ON(host->mrq != NULL); 1069 1070 host->mrq = req; 1071 1072 /* only touch fifo AFTER the controller readies it */ 1073 mmc_omap_prepare_data(host, req); 1074 mmc_omap_start_command(host, req->cmd); 1075 if (host->dma_in_use) { 1076 struct dma_chan *c = host->data->flags & MMC_DATA_WRITE ? 1077 host->dma_tx : host->dma_rx; 1078 1079 dma_async_issue_pending(c); 1080 } 1081 } 1082 1083 static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req) 1084 { 1085 struct mmc_omap_slot *slot = mmc_priv(mmc); 1086 struct mmc_omap_host *host = slot->host; 1087 unsigned long flags; 1088 1089 spin_lock_irqsave(&host->slot_lock, flags); 1090 if (host->mmc != NULL) { 1091 BUG_ON(slot->mrq != NULL); 1092 slot->mrq = req; 1093 spin_unlock_irqrestore(&host->slot_lock, flags); 1094 return; 1095 } else 1096 host->mmc = mmc; 1097 spin_unlock_irqrestore(&host->slot_lock, flags); 1098 mmc_omap_select_slot(slot, 1); 1099 mmc_omap_start_request(host, req); 1100 } 1101 1102 static void mmc_omap_set_power(struct mmc_omap_slot *slot, int power_on, 1103 int vdd) 1104 { 1105 struct mmc_omap_host *host; 1106 1107 host = slot->host; 1108 1109 if (slot->pdata->set_power != NULL) 1110 slot->pdata->set_power(mmc_dev(slot->mmc), slot->id, power_on, 1111 vdd); 1112 if (mmc_omap2()) { 1113 u16 w; 1114 1115 if (power_on) { 1116 w = OMAP_MMC_READ(host, CON); 1117 OMAP_MMC_WRITE(host, CON, w | (1 << 11)); 1118 } else { 1119 w = OMAP_MMC_READ(host, CON); 1120 OMAP_MMC_WRITE(host, CON, w & ~(1 << 11)); 1121 } 1122 } 1123 } 1124 1125 static int mmc_omap_calc_divisor(struct mmc_host *mmc, struct mmc_ios *ios) 1126 { 1127 struct mmc_omap_slot *slot = mmc_priv(mmc); 1128 struct mmc_omap_host *host = slot->host; 1129 int func_clk_rate = clk_get_rate(host->fclk); 1130 int dsor; 1131 1132 if (ios->clock == 0) 1133 return 0; 1134 1135 dsor = func_clk_rate / ios->clock; 1136 if (dsor < 1) 1137 dsor = 1; 1138 1139 if (func_clk_rate / dsor > ios->clock) 1140 dsor++; 1141 1142 if (dsor > 250) 1143 dsor = 250; 1144 1145 slot->fclk_freq = func_clk_rate / dsor; 1146 1147 if (ios->bus_width == MMC_BUS_WIDTH_4) 1148 dsor |= 1 << 15; 1149 1150 return dsor; 1151 } 1152 1153 static void mmc_omap_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1154 { 1155 struct mmc_omap_slot *slot = mmc_priv(mmc); 1156 struct mmc_omap_host *host = slot->host; 1157 int i, dsor; 1158 int clk_enabled, init_stream; 1159 1160 mmc_omap_select_slot(slot, 0); 1161 1162 dsor = mmc_omap_calc_divisor(mmc, ios); 1163 1164 if (ios->vdd != slot->vdd) 1165 slot->vdd = ios->vdd; 1166 1167 clk_enabled = 0; 1168 init_stream = 0; 1169 switch (ios->power_mode) { 1170 case MMC_POWER_OFF: 1171 mmc_omap_set_power(slot, 0, ios->vdd); 1172 break; 1173 case MMC_POWER_UP: 1174 /* Cannot touch dsor yet, just power up MMC */ 1175 mmc_omap_set_power(slot, 1, ios->vdd); 1176 slot->power_mode = ios->power_mode; 1177 goto exit; 1178 case MMC_POWER_ON: 1179 mmc_omap_fclk_enable(host, 1); 1180 clk_enabled = 1; 1181 dsor |= 1 << 11; 1182 if (slot->power_mode != MMC_POWER_ON) 1183 init_stream = 1; 1184 break; 1185 } 1186 slot->power_mode = ios->power_mode; 1187 1188 if (slot->bus_mode != ios->bus_mode) { 1189 if (slot->pdata->set_bus_mode != NULL) 1190 slot->pdata->set_bus_mode(mmc_dev(mmc), slot->id, 1191 ios->bus_mode); 1192 slot->bus_mode = ios->bus_mode; 1193 } 1194 1195 /* On insanely high arm_per frequencies something sometimes 1196 * goes somehow out of sync, and the POW bit is not being set, 1197 * which results in the while loop below getting stuck. 1198 * Writing to the CON register twice seems to do the trick. */ 1199 for (i = 0; i < 2; i++) 1200 OMAP_MMC_WRITE(host, CON, dsor); 1201 slot->saved_con = dsor; 1202 if (init_stream) { 1203 /* worst case at 400kHz, 80 cycles makes 200 microsecs */ 1204 int usecs = 250; 1205 1206 /* Send clock cycles, poll completion */ 1207 OMAP_MMC_WRITE(host, IE, 0); 1208 OMAP_MMC_WRITE(host, STAT, 0xffff); 1209 OMAP_MMC_WRITE(host, CMD, 1 << 7); 1210 while (usecs > 0 && (OMAP_MMC_READ(host, STAT) & 1) == 0) { 1211 udelay(1); 1212 usecs--; 1213 } 1214 OMAP_MMC_WRITE(host, STAT, 1); 1215 } 1216 1217 exit: 1218 mmc_omap_release_slot(slot, clk_enabled); 1219 } 1220 1221 static const struct mmc_host_ops mmc_omap_ops = { 1222 .request = mmc_omap_request, 1223 .set_ios = mmc_omap_set_ios, 1224 }; 1225 1226 static int mmc_omap_new_slot(struct mmc_omap_host *host, int id) 1227 { 1228 struct mmc_omap_slot *slot = NULL; 1229 struct mmc_host *mmc; 1230 int r; 1231 1232 mmc = mmc_alloc_host(sizeof(struct mmc_omap_slot), host->dev); 1233 if (mmc == NULL) 1234 return -ENOMEM; 1235 1236 slot = mmc_priv(mmc); 1237 slot->host = host; 1238 slot->mmc = mmc; 1239 slot->id = id; 1240 slot->power_mode = MMC_POWER_UNDEFINED; 1241 slot->pdata = &host->pdata->slots[id]; 1242 1243 host->slots[id] = slot; 1244 1245 mmc->caps = 0; 1246 if (host->pdata->slots[id].wires >= 4) 1247 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_ERASE; 1248 1249 mmc->ops = &mmc_omap_ops; 1250 mmc->f_min = 400000; 1251 1252 if (mmc_omap2()) 1253 mmc->f_max = 48000000; 1254 else 1255 mmc->f_max = 24000000; 1256 if (host->pdata->max_freq) 1257 mmc->f_max = min(host->pdata->max_freq, mmc->f_max); 1258 mmc->ocr_avail = slot->pdata->ocr_mask; 1259 1260 /* Use scatterlist DMA to reduce per-transfer costs. 1261 * NOTE max_seg_size assumption that small blocks aren't 1262 * normally used (except e.g. for reading SD registers). 1263 */ 1264 mmc->max_segs = 32; 1265 mmc->max_blk_size = 2048; /* BLEN is 11 bits (+1) */ 1266 mmc->max_blk_count = 2048; /* NBLK is 11 bits (+1) */ 1267 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 1268 mmc->max_seg_size = mmc->max_req_size; 1269 1270 if (slot->pdata->get_cover_state != NULL) { 1271 timer_setup(&slot->cover_timer, mmc_omap_cover_timer, 0); 1272 tasklet_init(&slot->cover_tasklet, mmc_omap_cover_handler, 1273 (unsigned long)slot); 1274 } 1275 1276 r = mmc_add_host(mmc); 1277 if (r < 0) 1278 goto err_remove_host; 1279 1280 if (slot->pdata->name != NULL) { 1281 r = device_create_file(&mmc->class_dev, 1282 &dev_attr_slot_name); 1283 if (r < 0) 1284 goto err_remove_host; 1285 } 1286 1287 if (slot->pdata->get_cover_state != NULL) { 1288 r = device_create_file(&mmc->class_dev, 1289 &dev_attr_cover_switch); 1290 if (r < 0) 1291 goto err_remove_slot_name; 1292 tasklet_schedule(&slot->cover_tasklet); 1293 } 1294 1295 return 0; 1296 1297 err_remove_slot_name: 1298 if (slot->pdata->name != NULL) 1299 device_remove_file(&mmc->class_dev, &dev_attr_slot_name); 1300 err_remove_host: 1301 mmc_remove_host(mmc); 1302 mmc_free_host(mmc); 1303 return r; 1304 } 1305 1306 static void mmc_omap_remove_slot(struct mmc_omap_slot *slot) 1307 { 1308 struct mmc_host *mmc = slot->mmc; 1309 1310 if (slot->pdata->name != NULL) 1311 device_remove_file(&mmc->class_dev, &dev_attr_slot_name); 1312 if (slot->pdata->get_cover_state != NULL) 1313 device_remove_file(&mmc->class_dev, &dev_attr_cover_switch); 1314 1315 tasklet_kill(&slot->cover_tasklet); 1316 del_timer_sync(&slot->cover_timer); 1317 flush_workqueue(slot->host->mmc_omap_wq); 1318 1319 mmc_remove_host(mmc); 1320 mmc_free_host(mmc); 1321 } 1322 1323 static int mmc_omap_probe(struct platform_device *pdev) 1324 { 1325 struct omap_mmc_platform_data *pdata = pdev->dev.platform_data; 1326 struct mmc_omap_host *host = NULL; 1327 struct resource *res; 1328 int i, ret = 0; 1329 int irq; 1330 1331 if (pdata == NULL) { 1332 dev_err(&pdev->dev, "platform data missing\n"); 1333 return -ENXIO; 1334 } 1335 if (pdata->nr_slots == 0) { 1336 dev_err(&pdev->dev, "no slots\n"); 1337 return -EPROBE_DEFER; 1338 } 1339 1340 host = devm_kzalloc(&pdev->dev, sizeof(struct mmc_omap_host), 1341 GFP_KERNEL); 1342 if (host == NULL) 1343 return -ENOMEM; 1344 1345 irq = platform_get_irq(pdev, 0); 1346 if (irq < 0) 1347 return -ENXIO; 1348 1349 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1350 host->virt_base = devm_ioremap_resource(&pdev->dev, res); 1351 if (IS_ERR(host->virt_base)) 1352 return PTR_ERR(host->virt_base); 1353 1354 INIT_WORK(&host->slot_release_work, mmc_omap_slot_release_work); 1355 INIT_WORK(&host->send_stop_work, mmc_omap_send_stop_work); 1356 1357 INIT_WORK(&host->cmd_abort_work, mmc_omap_abort_command); 1358 timer_setup(&host->cmd_abort_timer, mmc_omap_cmd_timer, 0); 1359 1360 spin_lock_init(&host->clk_lock); 1361 timer_setup(&host->clk_timer, mmc_omap_clk_timer, 0); 1362 1363 spin_lock_init(&host->dma_lock); 1364 spin_lock_init(&host->slot_lock); 1365 init_waitqueue_head(&host->slot_wq); 1366 1367 host->pdata = pdata; 1368 host->features = host->pdata->slots[0].features; 1369 host->dev = &pdev->dev; 1370 platform_set_drvdata(pdev, host); 1371 1372 host->id = pdev->id; 1373 host->irq = irq; 1374 host->phys_base = res->start; 1375 host->iclk = clk_get(&pdev->dev, "ick"); 1376 if (IS_ERR(host->iclk)) 1377 return PTR_ERR(host->iclk); 1378 clk_enable(host->iclk); 1379 1380 host->fclk = clk_get(&pdev->dev, "fck"); 1381 if (IS_ERR(host->fclk)) { 1382 ret = PTR_ERR(host->fclk); 1383 goto err_free_iclk; 1384 } 1385 1386 host->dma_tx_burst = -1; 1387 host->dma_rx_burst = -1; 1388 1389 host->dma_tx = dma_request_chan(&pdev->dev, "tx"); 1390 if (IS_ERR(host->dma_tx)) { 1391 ret = PTR_ERR(host->dma_tx); 1392 if (ret == -EPROBE_DEFER) { 1393 clk_put(host->fclk); 1394 goto err_free_iclk; 1395 } 1396 1397 host->dma_tx = NULL; 1398 dev_warn(host->dev, "TX DMA channel request failed\n"); 1399 } 1400 1401 host->dma_rx = dma_request_chan(&pdev->dev, "rx"); 1402 if (IS_ERR(host->dma_rx)) { 1403 ret = PTR_ERR(host->dma_rx); 1404 if (ret == -EPROBE_DEFER) { 1405 if (host->dma_tx) 1406 dma_release_channel(host->dma_tx); 1407 clk_put(host->fclk); 1408 goto err_free_iclk; 1409 } 1410 1411 host->dma_rx = NULL; 1412 dev_warn(host->dev, "RX DMA channel request failed\n"); 1413 } 1414 1415 ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host); 1416 if (ret) 1417 goto err_free_dma; 1418 1419 if (pdata->init != NULL) { 1420 ret = pdata->init(&pdev->dev); 1421 if (ret < 0) 1422 goto err_free_irq; 1423 } 1424 1425 host->nr_slots = pdata->nr_slots; 1426 host->reg_shift = (mmc_omap7xx() ? 1 : 2); 1427 1428 host->mmc_omap_wq = alloc_workqueue("mmc_omap", 0, 0); 1429 if (!host->mmc_omap_wq) { 1430 ret = -ENOMEM; 1431 goto err_plat_cleanup; 1432 } 1433 1434 for (i = 0; i < pdata->nr_slots; i++) { 1435 ret = mmc_omap_new_slot(host, i); 1436 if (ret < 0) { 1437 while (--i >= 0) 1438 mmc_omap_remove_slot(host->slots[i]); 1439 1440 goto err_destroy_wq; 1441 } 1442 } 1443 1444 return 0; 1445 1446 err_destroy_wq: 1447 destroy_workqueue(host->mmc_omap_wq); 1448 err_plat_cleanup: 1449 if (pdata->cleanup) 1450 pdata->cleanup(&pdev->dev); 1451 err_free_irq: 1452 free_irq(host->irq, host); 1453 err_free_dma: 1454 if (host->dma_tx) 1455 dma_release_channel(host->dma_tx); 1456 if (host->dma_rx) 1457 dma_release_channel(host->dma_rx); 1458 clk_put(host->fclk); 1459 err_free_iclk: 1460 clk_disable(host->iclk); 1461 clk_put(host->iclk); 1462 return ret; 1463 } 1464 1465 static int mmc_omap_remove(struct platform_device *pdev) 1466 { 1467 struct mmc_omap_host *host = platform_get_drvdata(pdev); 1468 int i; 1469 1470 BUG_ON(host == NULL); 1471 1472 for (i = 0; i < host->nr_slots; i++) 1473 mmc_omap_remove_slot(host->slots[i]); 1474 1475 if (host->pdata->cleanup) 1476 host->pdata->cleanup(&pdev->dev); 1477 1478 mmc_omap_fclk_enable(host, 0); 1479 free_irq(host->irq, host); 1480 clk_put(host->fclk); 1481 clk_disable(host->iclk); 1482 clk_put(host->iclk); 1483 1484 if (host->dma_tx) 1485 dma_release_channel(host->dma_tx); 1486 if (host->dma_rx) 1487 dma_release_channel(host->dma_rx); 1488 1489 destroy_workqueue(host->mmc_omap_wq); 1490 1491 return 0; 1492 } 1493 1494 #if IS_BUILTIN(CONFIG_OF) 1495 static const struct of_device_id mmc_omap_match[] = { 1496 { .compatible = "ti,omap2420-mmc", }, 1497 { }, 1498 }; 1499 MODULE_DEVICE_TABLE(of, mmc_omap_match); 1500 #endif 1501 1502 static struct platform_driver mmc_omap_driver = { 1503 .probe = mmc_omap_probe, 1504 .remove = mmc_omap_remove, 1505 .driver = { 1506 .name = DRIVER_NAME, 1507 .of_match_table = of_match_ptr(mmc_omap_match), 1508 }, 1509 }; 1510 1511 module_platform_driver(mmc_omap_driver); 1512 MODULE_DESCRIPTION("OMAP Multimedia Card driver"); 1513 MODULE_LICENSE("GPL"); 1514 MODULE_ALIAS("platform:" DRIVER_NAME); 1515 MODULE_AUTHOR("Juha Yrjölä"); 1516