atmel-mci.c revision 5c2f2b9bd0db84eabaf0d2cf7a9392a1581c2545
1/* 2 * Atmel MultiMedia Card Interface driver 3 * 4 * Copyright (C) 2004-2008 Atmel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10#include <linux/blkdev.h> 11#include <linux/clk.h> 12#include <linux/debugfs.h> 13#include <linux/device.h> 14#include <linux/dmaengine.h> 15#include <linux/dma-mapping.h> 16#include <linux/err.h> 17#include <linux/gpio.h> 18#include <linux/init.h> 19#include <linux/interrupt.h> 20#include <linux/ioport.h> 21#include <linux/module.h> 22#include <linux/platform_device.h> 23#include <linux/scatterlist.h> 24#include <linux/seq_file.h> 25#include <linux/slab.h> 26#include <linux/stat.h> 27 28#include <linux/mmc/host.h> 29#include <linux/mmc/sdio.h> 30 31#include <mach/atmel-mci.h> 32#include <linux/atmel-mci.h> 33 34#include <asm/io.h> 35#include <asm/unaligned.h> 36 37#include <mach/cpu.h> 38#include <mach/board.h> 39 40#include "atmel-mci-regs.h" 41 42#define ATMCI_DATA_ERROR_FLAGS (MCI_DCRCE | MCI_DTOE | MCI_OVRE | MCI_UNRE) 43#define ATMCI_DMA_THRESHOLD 16 44 45enum { 46 EVENT_CMD_COMPLETE = 0, 47 EVENT_XFER_COMPLETE, 48 EVENT_DATA_COMPLETE, 49 EVENT_DATA_ERROR, 50}; 51 52enum atmel_mci_state { 53 STATE_IDLE = 0, 54 STATE_SENDING_CMD, 55 STATE_SENDING_DATA, 56 STATE_DATA_BUSY, 57 STATE_SENDING_STOP, 58 STATE_DATA_ERROR, 59}; 60 61struct atmel_mci_dma { 62#ifdef CONFIG_MMC_ATMELMCI_DMA 63 struct dma_chan *chan; 64 struct dma_async_tx_descriptor *data_desc; 65#endif 66}; 67 68/** 69 * struct atmel_mci - MMC controller state shared between all slots 70 * @lock: Spinlock protecting the queue and associated data. 71 * @regs: Pointer to MMIO registers. 72 * @sg: Scatterlist entry currently being processed by PIO code, if any. 73 * @pio_offset: Offset into the current scatterlist entry. 74 * @cur_slot: The slot which is currently using the controller. 75 * @mrq: The request currently being processed on @cur_slot, 76 * or NULL if the controller is idle. 77 * @cmd: The command currently being sent to the card, or NULL. 78 * @data: The data currently being transferred, or NULL if no data 79 * transfer is in progress. 80 * @dma: DMA client state. 81 * @data_chan: DMA channel being used for the current data transfer. 82 * @cmd_status: Snapshot of SR taken upon completion of the current 83 * command. Only valid when EVENT_CMD_COMPLETE is pending. 84 * @data_status: Snapshot of SR taken upon completion of the current 85 * data transfer. Only valid when EVENT_DATA_COMPLETE or 86 * EVENT_DATA_ERROR is pending. 87 * @stop_cmdr: Value to be loaded into CMDR when the stop command is 88 * to be sent. 89 * @tasklet: Tasklet running the request state machine. 90 * @pending_events: Bitmask of events flagged by the interrupt handler 91 * to be processed by the tasklet. 92 * @completed_events: Bitmask of events which the state machine has 93 * processed. 94 * @state: Tasklet state. 95 * @queue: List of slots waiting for access to the controller. 96 * @need_clock_update: Update the clock rate before the next request. 97 * @need_reset: Reset controller before next request. 98 * @mode_reg: Value of the MR register. 99 * @cfg_reg: Value of the CFG register. 100 * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus 101 * rate and timeout calculations. 102 * @mapbase: Physical address of the MMIO registers. 103 * @mck: The peripheral bus clock hooked up to the MMC controller. 104 * @pdev: Platform device associated with the MMC controller. 105 * @slot: Slots sharing this MMC controller. 106 * 107 * Locking 108 * ======= 109 * 110 * @lock is a softirq-safe spinlock protecting @queue as well as 111 * @cur_slot, @mrq and @state. These must always be updated 112 * at the same time while holding @lock. 113 * 114 * @lock also protects mode_reg and need_clock_update since these are 115 * used to synchronize mode register updates with the queue 116 * processing. 117 * 118 * The @mrq field of struct atmel_mci_slot is also protected by @lock, 119 * and must always be written at the same time as the slot is added to 120 * @queue. 121 * 122 * @pending_events and @completed_events are accessed using atomic bit 123 * operations, so they don't need any locking. 124 * 125 * None of the fields touched by the interrupt handler need any 126 * locking. However, ordering is important: Before EVENT_DATA_ERROR or 127 * EVENT_DATA_COMPLETE is set in @pending_events, all data-related 128 * interrupts must be disabled and @data_status updated with a 129 * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the 130 * CMDRDY interrupt must be disabled and @cmd_status updated with a 131 * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the 132 * bytes_xfered field of @data must be written. This is ensured by 133 * using barriers. 134 */ 135struct atmel_mci { 136 spinlock_t lock; 137 void __iomem *regs; 138 139 struct scatterlist *sg; 140 unsigned int pio_offset; 141 142 struct atmel_mci_slot *cur_slot; 143 struct mmc_request *mrq; 144 struct mmc_command *cmd; 145 struct mmc_data *data; 146 147 struct atmel_mci_dma dma; 148 struct dma_chan *data_chan; 149 150 u32 cmd_status; 151 u32 data_status; 152 u32 stop_cmdr; 153 154 struct tasklet_struct tasklet; 155 unsigned long pending_events; 156 unsigned long completed_events; 157 enum atmel_mci_state state; 158 struct list_head queue; 159 160 bool need_clock_update; 161 bool need_reset; 162 u32 mode_reg; 163 u32 cfg_reg; 164 unsigned long bus_hz; 165 unsigned long mapbase; 166 struct clk *mck; 167 struct platform_device *pdev; 168 169 struct atmel_mci_slot *slot[ATMEL_MCI_MAX_NR_SLOTS]; 170}; 171 172/** 173 * struct atmel_mci_slot - MMC slot state 174 * @mmc: The mmc_host representing this slot. 175 * @host: The MMC controller this slot is using. 176 * @sdc_reg: Value of SDCR to be written before using this slot. 177 * @sdio_irq: SDIO irq mask for this slot. 178 * @mrq: mmc_request currently being processed or waiting to be 179 * processed, or NULL when the slot is idle. 180 * @queue_node: List node for placing this node in the @queue list of 181 * &struct atmel_mci. 182 * @clock: Clock rate configured by set_ios(). Protected by host->lock. 183 * @flags: Random state bits associated with the slot. 184 * @detect_pin: GPIO pin used for card detection, or negative if not 185 * available. 186 * @wp_pin: GPIO pin used for card write protect sending, or negative 187 * if not available. 188 * @detect_is_active_high: The state of the detect pin when it is active. 189 * @detect_timer: Timer used for debouncing @detect_pin interrupts. 190 */ 191struct atmel_mci_slot { 192 struct mmc_host *mmc; 193 struct atmel_mci *host; 194 195 u32 sdc_reg; 196 u32 sdio_irq; 197 198 struct mmc_request *mrq; 199 struct list_head queue_node; 200 201 unsigned int clock; 202 unsigned long flags; 203#define ATMCI_CARD_PRESENT 0 204#define ATMCI_CARD_NEED_INIT 1 205#define ATMCI_SHUTDOWN 2 206#define ATMCI_SUSPENDED 3 207 208 int detect_pin; 209 int wp_pin; 210 bool detect_is_active_high; 211 212 struct timer_list detect_timer; 213}; 214 215#define atmci_test_and_clear_pending(host, event) \ 216 test_and_clear_bit(event, &host->pending_events) 217#define atmci_set_completed(host, event) \ 218 set_bit(event, &host->completed_events) 219#define atmci_set_pending(host, event) \ 220 set_bit(event, &host->pending_events) 221 222/* 223 * Enable or disable features/registers based on 224 * whether the processor supports them 225 */ 226static bool mci_has_rwproof(void) 227{ 228 if (cpu_is_at91sam9261() || cpu_is_at91rm9200()) 229 return false; 230 else 231 return true; 232} 233 234/* 235 * The new MCI2 module isn't 100% compatible with the old MCI module, 236 * and it has a few nice features which we want to use... 237 */ 238static inline bool atmci_is_mci2(void) 239{ 240 if (cpu_is_at91sam9g45()) 241 return true; 242 243 return false; 244} 245 246 247/* 248 * The debugfs stuff below is mostly optimized away when 249 * CONFIG_DEBUG_FS is not set. 250 */ 251static int atmci_req_show(struct seq_file *s, void *v) 252{ 253 struct atmel_mci_slot *slot = s->private; 254 struct mmc_request *mrq; 255 struct mmc_command *cmd; 256 struct mmc_command *stop; 257 struct mmc_data *data; 258 259 /* Make sure we get a consistent snapshot */ 260 spin_lock_bh(&slot->host->lock); 261 mrq = slot->mrq; 262 263 if (mrq) { 264 cmd = mrq->cmd; 265 data = mrq->data; 266 stop = mrq->stop; 267 268 if (cmd) 269 seq_printf(s, 270 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", 271 cmd->opcode, cmd->arg, cmd->flags, 272 cmd->resp[0], cmd->resp[1], cmd->resp[2], 273 cmd->resp[3], cmd->error); 274 if (data) 275 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", 276 data->bytes_xfered, data->blocks, 277 data->blksz, data->flags, data->error); 278 if (stop) 279 seq_printf(s, 280 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", 281 stop->opcode, stop->arg, stop->flags, 282 stop->resp[0], stop->resp[1], stop->resp[2], 283 stop->resp[3], stop->error); 284 } 285 286 spin_unlock_bh(&slot->host->lock); 287 288 return 0; 289} 290 291static int atmci_req_open(struct inode *inode, struct file *file) 292{ 293 return single_open(file, atmci_req_show, inode->i_private); 294} 295 296static const struct file_operations atmci_req_fops = { 297 .owner = THIS_MODULE, 298 .open = atmci_req_open, 299 .read = seq_read, 300 .llseek = seq_lseek, 301 .release = single_release, 302}; 303 304static void atmci_show_status_reg(struct seq_file *s, 305 const char *regname, u32 value) 306{ 307 static const char *sr_bit[] = { 308 [0] = "CMDRDY", 309 [1] = "RXRDY", 310 [2] = "TXRDY", 311 [3] = "BLKE", 312 [4] = "DTIP", 313 [5] = "NOTBUSY", 314 [6] = "ENDRX", 315 [7] = "ENDTX", 316 [8] = "SDIOIRQA", 317 [9] = "SDIOIRQB", 318 [12] = "SDIOWAIT", 319 [14] = "RXBUFF", 320 [15] = "TXBUFE", 321 [16] = "RINDE", 322 [17] = "RDIRE", 323 [18] = "RCRCE", 324 [19] = "RENDE", 325 [20] = "RTOE", 326 [21] = "DCRCE", 327 [22] = "DTOE", 328 [23] = "CSTOE", 329 [24] = "BLKOVRE", 330 [25] = "DMADONE", 331 [26] = "FIFOEMPTY", 332 [27] = "XFRDONE", 333 [30] = "OVRE", 334 [31] = "UNRE", 335 }; 336 unsigned int i; 337 338 seq_printf(s, "%s:\t0x%08x", regname, value); 339 for (i = 0; i < ARRAY_SIZE(sr_bit); i++) { 340 if (value & (1 << i)) { 341 if (sr_bit[i]) 342 seq_printf(s, " %s", sr_bit[i]); 343 else 344 seq_puts(s, " UNKNOWN"); 345 } 346 } 347 seq_putc(s, '\n'); 348} 349 350static int atmci_regs_show(struct seq_file *s, void *v) 351{ 352 struct atmel_mci *host = s->private; 353 u32 *buf; 354 355 buf = kmalloc(MCI_REGS_SIZE, GFP_KERNEL); 356 if (!buf) 357 return -ENOMEM; 358 359 /* 360 * Grab a more or less consistent snapshot. Note that we're 361 * not disabling interrupts, so IMR and SR may not be 362 * consistent. 363 */ 364 spin_lock_bh(&host->lock); 365 clk_enable(host->mck); 366 memcpy_fromio(buf, host->regs, MCI_REGS_SIZE); 367 clk_disable(host->mck); 368 spin_unlock_bh(&host->lock); 369 370 seq_printf(s, "MR:\t0x%08x%s%s CLKDIV=%u\n", 371 buf[MCI_MR / 4], 372 buf[MCI_MR / 4] & MCI_MR_RDPROOF ? " RDPROOF" : "", 373 buf[MCI_MR / 4] & MCI_MR_WRPROOF ? " WRPROOF" : "", 374 buf[MCI_MR / 4] & 0xff); 375 seq_printf(s, "DTOR:\t0x%08x\n", buf[MCI_DTOR / 4]); 376 seq_printf(s, "SDCR:\t0x%08x\n", buf[MCI_SDCR / 4]); 377 seq_printf(s, "ARGR:\t0x%08x\n", buf[MCI_ARGR / 4]); 378 seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n", 379 buf[MCI_BLKR / 4], 380 buf[MCI_BLKR / 4] & 0xffff, 381 (buf[MCI_BLKR / 4] >> 16) & 0xffff); 382 if (atmci_is_mci2()) 383 seq_printf(s, "CSTOR:\t0x%08x\n", buf[MCI_CSTOR / 4]); 384 385 /* Don't read RSPR and RDR; it will consume the data there */ 386 387 atmci_show_status_reg(s, "SR", buf[MCI_SR / 4]); 388 atmci_show_status_reg(s, "IMR", buf[MCI_IMR / 4]); 389 390 if (atmci_is_mci2()) { 391 u32 val; 392 393 val = buf[MCI_DMA / 4]; 394 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n", 395 val, val & 3, 396 ((val >> 4) & 3) ? 397 1 << (((val >> 4) & 3) + 1) : 1, 398 val & MCI_DMAEN ? " DMAEN" : ""); 399 400 val = buf[MCI_CFG / 4]; 401 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n", 402 val, 403 val & MCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "", 404 val & MCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "", 405 val & MCI_CFG_HSMODE ? " HSMODE" : "", 406 val & MCI_CFG_LSYNC ? " LSYNC" : ""); 407 } 408 409 kfree(buf); 410 411 return 0; 412} 413 414static int atmci_regs_open(struct inode *inode, struct file *file) 415{ 416 return single_open(file, atmci_regs_show, inode->i_private); 417} 418 419static const struct file_operations atmci_regs_fops = { 420 .owner = THIS_MODULE, 421 .open = atmci_regs_open, 422 .read = seq_read, 423 .llseek = seq_lseek, 424 .release = single_release, 425}; 426 427static void atmci_init_debugfs(struct atmel_mci_slot *slot) 428{ 429 struct mmc_host *mmc = slot->mmc; 430 struct atmel_mci *host = slot->host; 431 struct dentry *root; 432 struct dentry *node; 433 434 root = mmc->debugfs_root; 435 if (!root) 436 return; 437 438 node = debugfs_create_file("regs", S_IRUSR, root, host, 439 &atmci_regs_fops); 440 if (IS_ERR(node)) 441 return; 442 if (!node) 443 goto err; 444 445 node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops); 446 if (!node) 447 goto err; 448 449 node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state); 450 if (!node) 451 goto err; 452 453 node = debugfs_create_x32("pending_events", S_IRUSR, root, 454 (u32 *)&host->pending_events); 455 if (!node) 456 goto err; 457 458 node = debugfs_create_x32("completed_events", S_IRUSR, root, 459 (u32 *)&host->completed_events); 460 if (!node) 461 goto err; 462 463 return; 464 465err: 466 dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n"); 467} 468 469static inline unsigned int ns_to_clocks(struct atmel_mci *host, 470 unsigned int ns) 471{ 472 return (ns * (host->bus_hz / 1000000) + 999) / 1000; 473} 474 475static void atmci_set_timeout(struct atmel_mci *host, 476 struct atmel_mci_slot *slot, struct mmc_data *data) 477{ 478 static unsigned dtomul_to_shift[] = { 479 0, 4, 7, 8, 10, 12, 16, 20 480 }; 481 unsigned timeout; 482 unsigned dtocyc; 483 unsigned dtomul; 484 485 timeout = ns_to_clocks(host, data->timeout_ns) + data->timeout_clks; 486 487 for (dtomul = 0; dtomul < 8; dtomul++) { 488 unsigned shift = dtomul_to_shift[dtomul]; 489 dtocyc = (timeout + (1 << shift) - 1) >> shift; 490 if (dtocyc < 15) 491 break; 492 } 493 494 if (dtomul >= 8) { 495 dtomul = 7; 496 dtocyc = 15; 497 } 498 499 dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n", 500 dtocyc << dtomul_to_shift[dtomul]); 501 mci_writel(host, DTOR, (MCI_DTOMUL(dtomul) | MCI_DTOCYC(dtocyc))); 502} 503 504/* 505 * Return mask with command flags to be enabled for this command. 506 */ 507static u32 atmci_prepare_command(struct mmc_host *mmc, 508 struct mmc_command *cmd) 509{ 510 struct mmc_data *data; 511 u32 cmdr; 512 513 cmd->error = -EINPROGRESS; 514 515 cmdr = MCI_CMDR_CMDNB(cmd->opcode); 516 517 if (cmd->flags & MMC_RSP_PRESENT) { 518 if (cmd->flags & MMC_RSP_136) 519 cmdr |= MCI_CMDR_RSPTYP_136BIT; 520 else 521 cmdr |= MCI_CMDR_RSPTYP_48BIT; 522 } 523 524 /* 525 * This should really be MAXLAT_5 for CMD2 and ACMD41, but 526 * it's too difficult to determine whether this is an ACMD or 527 * not. Better make it 64. 528 */ 529 cmdr |= MCI_CMDR_MAXLAT_64CYC; 530 531 if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN) 532 cmdr |= MCI_CMDR_OPDCMD; 533 534 data = cmd->data; 535 if (data) { 536 cmdr |= MCI_CMDR_START_XFER; 537 538 if (cmd->opcode == SD_IO_RW_EXTENDED) { 539 cmdr |= MCI_CMDR_SDIO_BLOCK; 540 } else { 541 if (data->flags & MMC_DATA_STREAM) 542 cmdr |= MCI_CMDR_STREAM; 543 else if (data->blocks > 1) 544 cmdr |= MCI_CMDR_MULTI_BLOCK; 545 else 546 cmdr |= MCI_CMDR_BLOCK; 547 } 548 549 if (data->flags & MMC_DATA_READ) 550 cmdr |= MCI_CMDR_TRDIR_READ; 551 } 552 553 return cmdr; 554} 555 556static void atmci_start_command(struct atmel_mci *host, 557 struct mmc_command *cmd, u32 cmd_flags) 558{ 559 WARN_ON(host->cmd); 560 host->cmd = cmd; 561 562 dev_vdbg(&host->pdev->dev, 563 "start command: ARGR=0x%08x CMDR=0x%08x\n", 564 cmd->arg, cmd_flags); 565 566 mci_writel(host, ARGR, cmd->arg); 567 mci_writel(host, CMDR, cmd_flags); 568} 569 570static void send_stop_cmd(struct atmel_mci *host, struct mmc_data *data) 571{ 572 atmci_start_command(host, data->stop, host->stop_cmdr); 573 mci_writel(host, IER, MCI_CMDRDY); 574} 575 576#ifdef CONFIG_MMC_ATMELMCI_DMA 577static void atmci_dma_cleanup(struct atmel_mci *host) 578{ 579 struct mmc_data *data = host->data; 580 581 if (data) 582 dma_unmap_sg(host->dma.chan->device->dev, 583 data->sg, data->sg_len, 584 ((data->flags & MMC_DATA_WRITE) 585 ? DMA_TO_DEVICE : DMA_FROM_DEVICE)); 586} 587 588static void atmci_stop_dma(struct atmel_mci *host) 589{ 590 struct dma_chan *chan = host->data_chan; 591 592 if (chan) { 593 dmaengine_terminate_all(chan); 594 atmci_dma_cleanup(host); 595 } else { 596 /* Data transfer was stopped by the interrupt handler */ 597 atmci_set_pending(host, EVENT_XFER_COMPLETE); 598 mci_writel(host, IER, MCI_NOTBUSY); 599 } 600} 601 602/* This function is called by the DMA driver from tasklet context. */ 603static void atmci_dma_complete(void *arg) 604{ 605 struct atmel_mci *host = arg; 606 struct mmc_data *data = host->data; 607 608 dev_vdbg(&host->pdev->dev, "DMA complete\n"); 609 610 if (atmci_is_mci2()) 611 /* Disable DMA hardware handshaking on MCI */ 612 mci_writel(host, DMA, mci_readl(host, DMA) & ~MCI_DMAEN); 613 614 atmci_dma_cleanup(host); 615 616 /* 617 * If the card was removed, data will be NULL. No point trying 618 * to send the stop command or waiting for NBUSY in this case. 619 */ 620 if (data) { 621 atmci_set_pending(host, EVENT_XFER_COMPLETE); 622 tasklet_schedule(&host->tasklet); 623 624 /* 625 * Regardless of what the documentation says, we have 626 * to wait for NOTBUSY even after block read 627 * operations. 628 * 629 * When the DMA transfer is complete, the controller 630 * may still be reading the CRC from the card, i.e. 631 * the data transfer is still in progress and we 632 * haven't seen all the potential error bits yet. 633 * 634 * The interrupt handler will schedule a different 635 * tasklet to finish things up when the data transfer 636 * is completely done. 637 * 638 * We may not complete the mmc request here anyway 639 * because the mmc layer may call back and cause us to 640 * violate the "don't submit new operations from the 641 * completion callback" rule of the dma engine 642 * framework. 643 */ 644 mci_writel(host, IER, MCI_NOTBUSY); 645 } 646} 647 648static int 649atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data) 650{ 651 struct dma_chan *chan; 652 struct dma_async_tx_descriptor *desc; 653 struct scatterlist *sg; 654 unsigned int i; 655 enum dma_data_direction direction; 656 unsigned int sglen; 657 658 /* 659 * We don't do DMA on "complex" transfers, i.e. with 660 * non-word-aligned buffers or lengths. Also, we don't bother 661 * with all the DMA setup overhead for short transfers. 662 */ 663 if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD) 664 return -EINVAL; 665 if (data->blksz & 3) 666 return -EINVAL; 667 668 for_each_sg(data->sg, sg, data->sg_len, i) { 669 if (sg->offset & 3 || sg->length & 3) 670 return -EINVAL; 671 } 672 673 /* If we don't have a channel, we can't do DMA */ 674 chan = host->dma.chan; 675 if (chan) 676 host->data_chan = chan; 677 678 if (!chan) 679 return -ENODEV; 680 681 if (atmci_is_mci2()) 682 mci_writel(host, DMA, MCI_DMA_CHKSIZE(3) | MCI_DMAEN); 683 684 if (data->flags & MMC_DATA_READ) 685 direction = DMA_FROM_DEVICE; 686 else 687 direction = DMA_TO_DEVICE; 688 689 sglen = dma_map_sg(chan->device->dev, data->sg, 690 data->sg_len, direction); 691 692 desc = chan->device->device_prep_slave_sg(chan, 693 data->sg, sglen, direction, 694 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 695 if (!desc) 696 goto unmap_exit; 697 698 host->dma.data_desc = desc; 699 desc->callback = atmci_dma_complete; 700 desc->callback_param = host; 701 702 return 0; 703unmap_exit: 704 dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction); 705 return -ENOMEM; 706} 707 708static void atmci_submit_data(struct atmel_mci *host) 709{ 710 struct dma_chan *chan = host->data_chan; 711 struct dma_async_tx_descriptor *desc = host->dma.data_desc; 712 713 if (chan) { 714 dmaengine_submit(desc); 715 dma_async_issue_pending(chan); 716 } 717} 718 719#else /* CONFIG_MMC_ATMELMCI_DMA */ 720 721static int atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data) 722{ 723 return -ENOSYS; 724} 725 726static void atmci_submit_data(struct atmel_mci *host) {} 727 728static void atmci_stop_dma(struct atmel_mci *host) 729{ 730 /* Data transfer was stopped by the interrupt handler */ 731 atmci_set_pending(host, EVENT_XFER_COMPLETE); 732 mci_writel(host, IER, MCI_NOTBUSY); 733} 734 735#endif /* CONFIG_MMC_ATMELMCI_DMA */ 736 737/* 738 * Returns a mask of interrupt flags to be enabled after the whole 739 * request has been prepared. 740 */ 741static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data) 742{ 743 u32 iflags; 744 745 data->error = -EINPROGRESS; 746 747 WARN_ON(host->data); 748 host->sg = NULL; 749 host->data = data; 750 751 iflags = ATMCI_DATA_ERROR_FLAGS; 752 if (atmci_prepare_data_dma(host, data)) { 753 host->data_chan = NULL; 754 755 /* 756 * Errata: MMC data write operation with less than 12 757 * bytes is impossible. 758 * 759 * Errata: MCI Transmit Data Register (TDR) FIFO 760 * corruption when length is not multiple of 4. 761 */ 762 if (data->blocks * data->blksz < 12 763 || (data->blocks * data->blksz) & 3) 764 host->need_reset = true; 765 766 host->sg = data->sg; 767 host->pio_offset = 0; 768 if (data->flags & MMC_DATA_READ) 769 iflags |= MCI_RXRDY; 770 else 771 iflags |= MCI_TXRDY; 772 } 773 774 return iflags; 775} 776 777static void atmci_start_request(struct atmel_mci *host, 778 struct atmel_mci_slot *slot) 779{ 780 struct mmc_request *mrq; 781 struct mmc_command *cmd; 782 struct mmc_data *data; 783 u32 iflags; 784 u32 cmdflags; 785 786 mrq = slot->mrq; 787 host->cur_slot = slot; 788 host->mrq = mrq; 789 790 host->pending_events = 0; 791 host->completed_events = 0; 792 host->data_status = 0; 793 794 if (host->need_reset) { 795 mci_writel(host, CR, MCI_CR_SWRST); 796 mci_writel(host, CR, MCI_CR_MCIEN); 797 mci_writel(host, MR, host->mode_reg); 798 if (atmci_is_mci2()) 799 mci_writel(host, CFG, host->cfg_reg); 800 host->need_reset = false; 801 } 802 mci_writel(host, SDCR, slot->sdc_reg); 803 804 iflags = mci_readl(host, IMR); 805 if (iflags & ~(MCI_SDIOIRQA | MCI_SDIOIRQB)) 806 dev_warn(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n", 807 iflags); 808 809 if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) { 810 /* Send init sequence (74 clock cycles) */ 811 mci_writel(host, CMDR, MCI_CMDR_SPCMD_INIT); 812 while (!(mci_readl(host, SR) & MCI_CMDRDY)) 813 cpu_relax(); 814 } 815 iflags = 0; 816 data = mrq->data; 817 if (data) { 818 atmci_set_timeout(host, slot, data); 819 820 /* Must set block count/size before sending command */ 821 mci_writel(host, BLKR, MCI_BCNT(data->blocks) 822 | MCI_BLKLEN(data->blksz)); 823 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n", 824 MCI_BCNT(data->blocks) | MCI_BLKLEN(data->blksz)); 825 826 iflags |= atmci_prepare_data(host, data); 827 } 828 829 iflags |= MCI_CMDRDY; 830 cmd = mrq->cmd; 831 cmdflags = atmci_prepare_command(slot->mmc, cmd); 832 atmci_start_command(host, cmd, cmdflags); 833 834 if (data) 835 atmci_submit_data(host); 836 837 if (mrq->stop) { 838 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop); 839 host->stop_cmdr |= MCI_CMDR_STOP_XFER; 840 if (!(data->flags & MMC_DATA_WRITE)) 841 host->stop_cmdr |= MCI_CMDR_TRDIR_READ; 842 if (data->flags & MMC_DATA_STREAM) 843 host->stop_cmdr |= MCI_CMDR_STREAM; 844 else 845 host->stop_cmdr |= MCI_CMDR_MULTI_BLOCK; 846 } 847 848 /* 849 * We could have enabled interrupts earlier, but I suspect 850 * that would open up a nice can of interesting race 851 * conditions (e.g. command and data complete, but stop not 852 * prepared yet.) 853 */ 854 mci_writel(host, IER, iflags); 855} 856 857static void atmci_queue_request(struct atmel_mci *host, 858 struct atmel_mci_slot *slot, struct mmc_request *mrq) 859{ 860 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", 861 host->state); 862 863 spin_lock_bh(&host->lock); 864 slot->mrq = mrq; 865 if (host->state == STATE_IDLE) { 866 host->state = STATE_SENDING_CMD; 867 atmci_start_request(host, slot); 868 } else { 869 list_add_tail(&slot->queue_node, &host->queue); 870 } 871 spin_unlock_bh(&host->lock); 872} 873 874static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq) 875{ 876 struct atmel_mci_slot *slot = mmc_priv(mmc); 877 struct atmel_mci *host = slot->host; 878 struct mmc_data *data; 879 880 WARN_ON(slot->mrq); 881 882 /* 883 * We may "know" the card is gone even though there's still an 884 * electrical connection. If so, we really need to communicate 885 * this to the MMC core since there won't be any more 886 * interrupts as the card is completely removed. Otherwise, 887 * the MMC core might believe the card is still there even 888 * though the card was just removed very slowly. 889 */ 890 if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) { 891 mrq->cmd->error = -ENOMEDIUM; 892 mmc_request_done(mmc, mrq); 893 return; 894 } 895 896 /* We don't support multiple blocks of weird lengths. */ 897 data = mrq->data; 898 if (data && data->blocks > 1 && data->blksz & 3) { 899 mrq->cmd->error = -EINVAL; 900 mmc_request_done(mmc, mrq); 901 } 902 903 atmci_queue_request(host, slot, mrq); 904} 905 906static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 907{ 908 struct atmel_mci_slot *slot = mmc_priv(mmc); 909 struct atmel_mci *host = slot->host; 910 unsigned int i; 911 912 slot->sdc_reg &= ~MCI_SDCBUS_MASK; 913 switch (ios->bus_width) { 914 case MMC_BUS_WIDTH_1: 915 slot->sdc_reg |= MCI_SDCBUS_1BIT; 916 break; 917 case MMC_BUS_WIDTH_4: 918 slot->sdc_reg |= MCI_SDCBUS_4BIT; 919 break; 920 } 921 922 if (ios->clock) { 923 unsigned int clock_min = ~0U; 924 u32 clkdiv; 925 926 spin_lock_bh(&host->lock); 927 if (!host->mode_reg) { 928 clk_enable(host->mck); 929 mci_writel(host, CR, MCI_CR_SWRST); 930 mci_writel(host, CR, MCI_CR_MCIEN); 931 if (atmci_is_mci2()) 932 mci_writel(host, CFG, host->cfg_reg); 933 } 934 935 /* 936 * Use mirror of ios->clock to prevent race with mmc 937 * core ios update when finding the minimum. 938 */ 939 slot->clock = ios->clock; 940 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 941 if (host->slot[i] && host->slot[i]->clock 942 && host->slot[i]->clock < clock_min) 943 clock_min = host->slot[i]->clock; 944 } 945 946 /* Calculate clock divider */ 947 clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1; 948 if (clkdiv > 255) { 949 dev_warn(&mmc->class_dev, 950 "clock %u too slow; using %lu\n", 951 clock_min, host->bus_hz / (2 * 256)); 952 clkdiv = 255; 953 } 954 955 host->mode_reg = MCI_MR_CLKDIV(clkdiv); 956 957 /* 958 * WRPROOF and RDPROOF prevent overruns/underruns by 959 * stopping the clock when the FIFO is full/empty. 960 * This state is not expected to last for long. 961 */ 962 if (mci_has_rwproof()) 963 host->mode_reg |= (MCI_MR_WRPROOF | MCI_MR_RDPROOF); 964 965 if (atmci_is_mci2()) { 966 /* setup High Speed mode in relation with card capacity */ 967 if (ios->timing == MMC_TIMING_SD_HS) 968 host->cfg_reg |= MCI_CFG_HSMODE; 969 else 970 host->cfg_reg &= ~MCI_CFG_HSMODE; 971 } 972 973 if (list_empty(&host->queue)) { 974 mci_writel(host, MR, host->mode_reg); 975 if (atmci_is_mci2()) 976 mci_writel(host, CFG, host->cfg_reg); 977 } else { 978 host->need_clock_update = true; 979 } 980 981 spin_unlock_bh(&host->lock); 982 } else { 983 bool any_slot_active = false; 984 985 spin_lock_bh(&host->lock); 986 slot->clock = 0; 987 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 988 if (host->slot[i] && host->slot[i]->clock) { 989 any_slot_active = true; 990 break; 991 } 992 } 993 if (!any_slot_active) { 994 mci_writel(host, CR, MCI_CR_MCIDIS); 995 if (host->mode_reg) { 996 mci_readl(host, MR); 997 clk_disable(host->mck); 998 } 999 host->mode_reg = 0; 1000 } 1001 spin_unlock_bh(&host->lock); 1002 } 1003 1004 switch (ios->power_mode) { 1005 case MMC_POWER_UP: 1006 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags); 1007 break; 1008 default: 1009 /* 1010 * TODO: None of the currently available AVR32-based 1011 * boards allow MMC power to be turned off. Implement 1012 * power control when this can be tested properly. 1013 * 1014 * We also need to hook this into the clock management 1015 * somehow so that newly inserted cards aren't 1016 * subjected to a fast clock before we have a chance 1017 * to figure out what the maximum rate is. Currently, 1018 * there's no way to avoid this, and there never will 1019 * be for boards that don't support power control. 1020 */ 1021 break; 1022 } 1023} 1024 1025static int atmci_get_ro(struct mmc_host *mmc) 1026{ 1027 int read_only = -ENOSYS; 1028 struct atmel_mci_slot *slot = mmc_priv(mmc); 1029 1030 if (gpio_is_valid(slot->wp_pin)) { 1031 read_only = gpio_get_value(slot->wp_pin); 1032 dev_dbg(&mmc->class_dev, "card is %s\n", 1033 read_only ? "read-only" : "read-write"); 1034 } 1035 1036 return read_only; 1037} 1038 1039static int atmci_get_cd(struct mmc_host *mmc) 1040{ 1041 int present = -ENOSYS; 1042 struct atmel_mci_slot *slot = mmc_priv(mmc); 1043 1044 if (gpio_is_valid(slot->detect_pin)) { 1045 present = !(gpio_get_value(slot->detect_pin) ^ 1046 slot->detect_is_active_high); 1047 dev_dbg(&mmc->class_dev, "card is %spresent\n", 1048 present ? "" : "not "); 1049 } 1050 1051 return present; 1052} 1053 1054static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 1055{ 1056 struct atmel_mci_slot *slot = mmc_priv(mmc); 1057 struct atmel_mci *host = slot->host; 1058 1059 if (enable) 1060 mci_writel(host, IER, slot->sdio_irq); 1061 else 1062 mci_writel(host, IDR, slot->sdio_irq); 1063} 1064 1065static const struct mmc_host_ops atmci_ops = { 1066 .request = atmci_request, 1067 .set_ios = atmci_set_ios, 1068 .get_ro = atmci_get_ro, 1069 .get_cd = atmci_get_cd, 1070 .enable_sdio_irq = atmci_enable_sdio_irq, 1071}; 1072 1073/* Called with host->lock held */ 1074static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq) 1075 __releases(&host->lock) 1076 __acquires(&host->lock) 1077{ 1078 struct atmel_mci_slot *slot = NULL; 1079 struct mmc_host *prev_mmc = host->cur_slot->mmc; 1080 1081 WARN_ON(host->cmd || host->data); 1082 1083 /* 1084 * Update the MMC clock rate if necessary. This may be 1085 * necessary if set_ios() is called when a different slot is 1086 * busy transferring data. 1087 */ 1088 if (host->need_clock_update) { 1089 mci_writel(host, MR, host->mode_reg); 1090 if (atmci_is_mci2()) 1091 mci_writel(host, CFG, host->cfg_reg); 1092 } 1093 1094 host->cur_slot->mrq = NULL; 1095 host->mrq = NULL; 1096 if (!list_empty(&host->queue)) { 1097 slot = list_entry(host->queue.next, 1098 struct atmel_mci_slot, queue_node); 1099 list_del(&slot->queue_node); 1100 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n", 1101 mmc_hostname(slot->mmc)); 1102 host->state = STATE_SENDING_CMD; 1103 atmci_start_request(host, slot); 1104 } else { 1105 dev_vdbg(&host->pdev->dev, "list empty\n"); 1106 host->state = STATE_IDLE; 1107 } 1108 1109 spin_unlock(&host->lock); 1110 mmc_request_done(prev_mmc, mrq); 1111 spin_lock(&host->lock); 1112} 1113 1114static void atmci_command_complete(struct atmel_mci *host, 1115 struct mmc_command *cmd) 1116{ 1117 u32 status = host->cmd_status; 1118 1119 /* Read the response from the card (up to 16 bytes) */ 1120 cmd->resp[0] = mci_readl(host, RSPR); 1121 cmd->resp[1] = mci_readl(host, RSPR); 1122 cmd->resp[2] = mci_readl(host, RSPR); 1123 cmd->resp[3] = mci_readl(host, RSPR); 1124 1125 if (status & MCI_RTOE) 1126 cmd->error = -ETIMEDOUT; 1127 else if ((cmd->flags & MMC_RSP_CRC) && (status & MCI_RCRCE)) 1128 cmd->error = -EILSEQ; 1129 else if (status & (MCI_RINDE | MCI_RDIRE | MCI_RENDE)) 1130 cmd->error = -EIO; 1131 else 1132 cmd->error = 0; 1133 1134 if (cmd->error) { 1135 dev_dbg(&host->pdev->dev, 1136 "command error: status=0x%08x\n", status); 1137 1138 if (cmd->data) { 1139 atmci_stop_dma(host); 1140 host->data = NULL; 1141 mci_writel(host, IDR, MCI_NOTBUSY 1142 | MCI_TXRDY | MCI_RXRDY 1143 | ATMCI_DATA_ERROR_FLAGS); 1144 } 1145 } 1146} 1147 1148static void atmci_detect_change(unsigned long data) 1149{ 1150 struct atmel_mci_slot *slot = (struct atmel_mci_slot *)data; 1151 bool present; 1152 bool present_old; 1153 1154 /* 1155 * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before 1156 * freeing the interrupt. We must not re-enable the interrupt 1157 * if it has been freed, and if we're shutting down, it 1158 * doesn't really matter whether the card is present or not. 1159 */ 1160 smp_rmb(); 1161 if (test_bit(ATMCI_SHUTDOWN, &slot->flags)) 1162 return; 1163 1164 enable_irq(gpio_to_irq(slot->detect_pin)); 1165 present = !(gpio_get_value(slot->detect_pin) ^ 1166 slot->detect_is_active_high); 1167 present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags); 1168 1169 dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n", 1170 present, present_old); 1171 1172 if (present != present_old) { 1173 struct atmel_mci *host = slot->host; 1174 struct mmc_request *mrq; 1175 1176 dev_dbg(&slot->mmc->class_dev, "card %s\n", 1177 present ? "inserted" : "removed"); 1178 1179 spin_lock(&host->lock); 1180 1181 if (!present) 1182 clear_bit(ATMCI_CARD_PRESENT, &slot->flags); 1183 else 1184 set_bit(ATMCI_CARD_PRESENT, &slot->flags); 1185 1186 /* Clean up queue if present */ 1187 mrq = slot->mrq; 1188 if (mrq) { 1189 if (mrq == host->mrq) { 1190 /* 1191 * Reset controller to terminate any ongoing 1192 * commands or data transfers. 1193 */ 1194 mci_writel(host, CR, MCI_CR_SWRST); 1195 mci_writel(host, CR, MCI_CR_MCIEN); 1196 mci_writel(host, MR, host->mode_reg); 1197 if (atmci_is_mci2()) 1198 mci_writel(host, CFG, host->cfg_reg); 1199 1200 host->data = NULL; 1201 host->cmd = NULL; 1202 1203 switch (host->state) { 1204 case STATE_IDLE: 1205 break; 1206 case STATE_SENDING_CMD: 1207 mrq->cmd->error = -ENOMEDIUM; 1208 if (!mrq->data) 1209 break; 1210 /* fall through */ 1211 case STATE_SENDING_DATA: 1212 mrq->data->error = -ENOMEDIUM; 1213 atmci_stop_dma(host); 1214 break; 1215 case STATE_DATA_BUSY: 1216 case STATE_DATA_ERROR: 1217 if (mrq->data->error == -EINPROGRESS) 1218 mrq->data->error = -ENOMEDIUM; 1219 if (!mrq->stop) 1220 break; 1221 /* fall through */ 1222 case STATE_SENDING_STOP: 1223 mrq->stop->error = -ENOMEDIUM; 1224 break; 1225 } 1226 1227 atmci_request_end(host, mrq); 1228 } else { 1229 list_del(&slot->queue_node); 1230 mrq->cmd->error = -ENOMEDIUM; 1231 if (mrq->data) 1232 mrq->data->error = -ENOMEDIUM; 1233 if (mrq->stop) 1234 mrq->stop->error = -ENOMEDIUM; 1235 1236 spin_unlock(&host->lock); 1237 mmc_request_done(slot->mmc, mrq); 1238 spin_lock(&host->lock); 1239 } 1240 } 1241 spin_unlock(&host->lock); 1242 1243 mmc_detect_change(slot->mmc, 0); 1244 } 1245} 1246 1247static void atmci_tasklet_func(unsigned long priv) 1248{ 1249 struct atmel_mci *host = (struct atmel_mci *)priv; 1250 struct mmc_request *mrq = host->mrq; 1251 struct mmc_data *data = host->data; 1252 struct mmc_command *cmd = host->cmd; 1253 enum atmel_mci_state state = host->state; 1254 enum atmel_mci_state prev_state; 1255 u32 status; 1256 1257 spin_lock(&host->lock); 1258 1259 state = host->state; 1260 1261 dev_vdbg(&host->pdev->dev, 1262 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n", 1263 state, host->pending_events, host->completed_events, 1264 mci_readl(host, IMR)); 1265 1266 do { 1267 prev_state = state; 1268 1269 switch (state) { 1270 case STATE_IDLE: 1271 break; 1272 1273 case STATE_SENDING_CMD: 1274 if (!atmci_test_and_clear_pending(host, 1275 EVENT_CMD_COMPLETE)) 1276 break; 1277 1278 host->cmd = NULL; 1279 atmci_set_completed(host, EVENT_CMD_COMPLETE); 1280 atmci_command_complete(host, mrq->cmd); 1281 if (!mrq->data || cmd->error) { 1282 atmci_request_end(host, host->mrq); 1283 goto unlock; 1284 } 1285 1286 prev_state = state = STATE_SENDING_DATA; 1287 /* fall through */ 1288 1289 case STATE_SENDING_DATA: 1290 if (atmci_test_and_clear_pending(host, 1291 EVENT_DATA_ERROR)) { 1292 atmci_stop_dma(host); 1293 if (data->stop) 1294 send_stop_cmd(host, data); 1295 state = STATE_DATA_ERROR; 1296 break; 1297 } 1298 1299 if (!atmci_test_and_clear_pending(host, 1300 EVENT_XFER_COMPLETE)) 1301 break; 1302 1303 atmci_set_completed(host, EVENT_XFER_COMPLETE); 1304 prev_state = state = STATE_DATA_BUSY; 1305 /* fall through */ 1306 1307 case STATE_DATA_BUSY: 1308 if (!atmci_test_and_clear_pending(host, 1309 EVENT_DATA_COMPLETE)) 1310 break; 1311 1312 host->data = NULL; 1313 atmci_set_completed(host, EVENT_DATA_COMPLETE); 1314 status = host->data_status; 1315 if (unlikely(status & ATMCI_DATA_ERROR_FLAGS)) { 1316 if (status & MCI_DTOE) { 1317 dev_dbg(&host->pdev->dev, 1318 "data timeout error\n"); 1319 data->error = -ETIMEDOUT; 1320 } else if (status & MCI_DCRCE) { 1321 dev_dbg(&host->pdev->dev, 1322 "data CRC error\n"); 1323 data->error = -EILSEQ; 1324 } else { 1325 dev_dbg(&host->pdev->dev, 1326 "data FIFO error (status=%08x)\n", 1327 status); 1328 data->error = -EIO; 1329 } 1330 } else { 1331 data->bytes_xfered = data->blocks * data->blksz; 1332 data->error = 0; 1333 mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS); 1334 } 1335 1336 if (!data->stop) { 1337 atmci_request_end(host, host->mrq); 1338 goto unlock; 1339 } 1340 1341 prev_state = state = STATE_SENDING_STOP; 1342 if (!data->error) 1343 send_stop_cmd(host, data); 1344 /* fall through */ 1345 1346 case STATE_SENDING_STOP: 1347 if (!atmci_test_and_clear_pending(host, 1348 EVENT_CMD_COMPLETE)) 1349 break; 1350 1351 host->cmd = NULL; 1352 atmci_command_complete(host, mrq->stop); 1353 atmci_request_end(host, host->mrq); 1354 goto unlock; 1355 1356 case STATE_DATA_ERROR: 1357 if (!atmci_test_and_clear_pending(host, 1358 EVENT_XFER_COMPLETE)) 1359 break; 1360 1361 state = STATE_DATA_BUSY; 1362 break; 1363 } 1364 } while (state != prev_state); 1365 1366 host->state = state; 1367 1368unlock: 1369 spin_unlock(&host->lock); 1370} 1371 1372static void atmci_read_data_pio(struct atmel_mci *host) 1373{ 1374 struct scatterlist *sg = host->sg; 1375 void *buf = sg_virt(sg); 1376 unsigned int offset = host->pio_offset; 1377 struct mmc_data *data = host->data; 1378 u32 value; 1379 u32 status; 1380 unsigned int nbytes = 0; 1381 1382 do { 1383 value = mci_readl(host, RDR); 1384 if (likely(offset + 4 <= sg->length)) { 1385 put_unaligned(value, (u32 *)(buf + offset)); 1386 1387 offset += 4; 1388 nbytes += 4; 1389 1390 if (offset == sg->length) { 1391 flush_dcache_page(sg_page(sg)); 1392 host->sg = sg = sg_next(sg); 1393 if (!sg) 1394 goto done; 1395 1396 offset = 0; 1397 buf = sg_virt(sg); 1398 } 1399 } else { 1400 unsigned int remaining = sg->length - offset; 1401 memcpy(buf + offset, &value, remaining); 1402 nbytes += remaining; 1403 1404 flush_dcache_page(sg_page(sg)); 1405 host->sg = sg = sg_next(sg); 1406 if (!sg) 1407 goto done; 1408 1409 offset = 4 - remaining; 1410 buf = sg_virt(sg); 1411 memcpy(buf, (u8 *)&value + remaining, offset); 1412 nbytes += offset; 1413 } 1414 1415 status = mci_readl(host, SR); 1416 if (status & ATMCI_DATA_ERROR_FLAGS) { 1417 mci_writel(host, IDR, (MCI_NOTBUSY | MCI_RXRDY 1418 | ATMCI_DATA_ERROR_FLAGS)); 1419 host->data_status = status; 1420 data->bytes_xfered += nbytes; 1421 smp_wmb(); 1422 atmci_set_pending(host, EVENT_DATA_ERROR); 1423 tasklet_schedule(&host->tasklet); 1424 return; 1425 } 1426 } while (status & MCI_RXRDY); 1427 1428 host->pio_offset = offset; 1429 data->bytes_xfered += nbytes; 1430 1431 return; 1432 1433done: 1434 mci_writel(host, IDR, MCI_RXRDY); 1435 mci_writel(host, IER, MCI_NOTBUSY); 1436 data->bytes_xfered += nbytes; 1437 smp_wmb(); 1438 atmci_set_pending(host, EVENT_XFER_COMPLETE); 1439} 1440 1441static void atmci_write_data_pio(struct atmel_mci *host) 1442{ 1443 struct scatterlist *sg = host->sg; 1444 void *buf = sg_virt(sg); 1445 unsigned int offset = host->pio_offset; 1446 struct mmc_data *data = host->data; 1447 u32 value; 1448 u32 status; 1449 unsigned int nbytes = 0; 1450 1451 do { 1452 if (likely(offset + 4 <= sg->length)) { 1453 value = get_unaligned((u32 *)(buf + offset)); 1454 mci_writel(host, TDR, value); 1455 1456 offset += 4; 1457 nbytes += 4; 1458 if (offset == sg->length) { 1459 host->sg = sg = sg_next(sg); 1460 if (!sg) 1461 goto done; 1462 1463 offset = 0; 1464 buf = sg_virt(sg); 1465 } 1466 } else { 1467 unsigned int remaining = sg->length - offset; 1468 1469 value = 0; 1470 memcpy(&value, buf + offset, remaining); 1471 nbytes += remaining; 1472 1473 host->sg = sg = sg_next(sg); 1474 if (!sg) { 1475 mci_writel(host, TDR, value); 1476 goto done; 1477 } 1478 1479 offset = 4 - remaining; 1480 buf = sg_virt(sg); 1481 memcpy((u8 *)&value + remaining, buf, offset); 1482 mci_writel(host, TDR, value); 1483 nbytes += offset; 1484 } 1485 1486 status = mci_readl(host, SR); 1487 if (status & ATMCI_DATA_ERROR_FLAGS) { 1488 mci_writel(host, IDR, (MCI_NOTBUSY | MCI_TXRDY 1489 | ATMCI_DATA_ERROR_FLAGS)); 1490 host->data_status = status; 1491 data->bytes_xfered += nbytes; 1492 smp_wmb(); 1493 atmci_set_pending(host, EVENT_DATA_ERROR); 1494 tasklet_schedule(&host->tasklet); 1495 return; 1496 } 1497 } while (status & MCI_TXRDY); 1498 1499 host->pio_offset = offset; 1500 data->bytes_xfered += nbytes; 1501 1502 return; 1503 1504done: 1505 mci_writel(host, IDR, MCI_TXRDY); 1506 mci_writel(host, IER, MCI_NOTBUSY); 1507 data->bytes_xfered += nbytes; 1508 smp_wmb(); 1509 atmci_set_pending(host, EVENT_XFER_COMPLETE); 1510} 1511 1512static void atmci_cmd_interrupt(struct atmel_mci *host, u32 status) 1513{ 1514 mci_writel(host, IDR, MCI_CMDRDY); 1515 1516 host->cmd_status = status; 1517 smp_wmb(); 1518 atmci_set_pending(host, EVENT_CMD_COMPLETE); 1519 tasklet_schedule(&host->tasklet); 1520} 1521 1522static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status) 1523{ 1524 int i; 1525 1526 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 1527 struct atmel_mci_slot *slot = host->slot[i]; 1528 if (slot && (status & slot->sdio_irq)) { 1529 mmc_signal_sdio_irq(slot->mmc); 1530 } 1531 } 1532} 1533 1534 1535static irqreturn_t atmci_interrupt(int irq, void *dev_id) 1536{ 1537 struct atmel_mci *host = dev_id; 1538 u32 status, mask, pending; 1539 unsigned int pass_count = 0; 1540 1541 do { 1542 status = mci_readl(host, SR); 1543 mask = mci_readl(host, IMR); 1544 pending = status & mask; 1545 if (!pending) 1546 break; 1547 1548 if (pending & ATMCI_DATA_ERROR_FLAGS) { 1549 mci_writel(host, IDR, ATMCI_DATA_ERROR_FLAGS 1550 | MCI_RXRDY | MCI_TXRDY); 1551 pending &= mci_readl(host, IMR); 1552 1553 host->data_status = status; 1554 smp_wmb(); 1555 atmci_set_pending(host, EVENT_DATA_ERROR); 1556 tasklet_schedule(&host->tasklet); 1557 } 1558 if (pending & MCI_NOTBUSY) { 1559 mci_writel(host, IDR, 1560 ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY); 1561 if (!host->data_status) 1562 host->data_status = status; 1563 smp_wmb(); 1564 atmci_set_pending(host, EVENT_DATA_COMPLETE); 1565 tasklet_schedule(&host->tasklet); 1566 } 1567 if (pending & MCI_RXRDY) 1568 atmci_read_data_pio(host); 1569 if (pending & MCI_TXRDY) 1570 atmci_write_data_pio(host); 1571 1572 if (pending & MCI_CMDRDY) 1573 atmci_cmd_interrupt(host, status); 1574 1575 if (pending & (MCI_SDIOIRQA | MCI_SDIOIRQB)) 1576 atmci_sdio_interrupt(host, status); 1577 1578 } while (pass_count++ < 5); 1579 1580 return pass_count ? IRQ_HANDLED : IRQ_NONE; 1581} 1582 1583static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id) 1584{ 1585 struct atmel_mci_slot *slot = dev_id; 1586 1587 /* 1588 * Disable interrupts until the pin has stabilized and check 1589 * the state then. Use mod_timer() since we may be in the 1590 * middle of the timer routine when this interrupt triggers. 1591 */ 1592 disable_irq_nosync(irq); 1593 mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20)); 1594 1595 return IRQ_HANDLED; 1596} 1597 1598static int __init atmci_init_slot(struct atmel_mci *host, 1599 struct mci_slot_pdata *slot_data, unsigned int id, 1600 u32 sdc_reg, u32 sdio_irq) 1601{ 1602 struct mmc_host *mmc; 1603 struct atmel_mci_slot *slot; 1604 1605 mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev); 1606 if (!mmc) 1607 return -ENOMEM; 1608 1609 slot = mmc_priv(mmc); 1610 slot->mmc = mmc; 1611 slot->host = host; 1612 slot->detect_pin = slot_data->detect_pin; 1613 slot->wp_pin = slot_data->wp_pin; 1614 slot->detect_is_active_high = slot_data->detect_is_active_high; 1615 slot->sdc_reg = sdc_reg; 1616 slot->sdio_irq = sdio_irq; 1617 1618 mmc->ops = &atmci_ops; 1619 mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512); 1620 mmc->f_max = host->bus_hz / 2; 1621 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 1622 if (sdio_irq) 1623 mmc->caps |= MMC_CAP_SDIO_IRQ; 1624 if (atmci_is_mci2()) 1625 mmc->caps |= MMC_CAP_SD_HIGHSPEED; 1626 if (slot_data->bus_width >= 4) 1627 mmc->caps |= MMC_CAP_4_BIT_DATA; 1628 1629 mmc->max_segs = 64; 1630 mmc->max_req_size = 32768 * 512; 1631 mmc->max_blk_size = 32768; 1632 mmc->max_blk_count = 512; 1633 1634 /* Assume card is present initially */ 1635 set_bit(ATMCI_CARD_PRESENT, &slot->flags); 1636 if (gpio_is_valid(slot->detect_pin)) { 1637 if (gpio_request(slot->detect_pin, "mmc_detect")) { 1638 dev_dbg(&mmc->class_dev, "no detect pin available\n"); 1639 slot->detect_pin = -EBUSY; 1640 } else if (gpio_get_value(slot->detect_pin) ^ 1641 slot->detect_is_active_high) { 1642 clear_bit(ATMCI_CARD_PRESENT, &slot->flags); 1643 } 1644 } 1645 1646 if (!gpio_is_valid(slot->detect_pin)) 1647 mmc->caps |= MMC_CAP_NEEDS_POLL; 1648 1649 if (gpio_is_valid(slot->wp_pin)) { 1650 if (gpio_request(slot->wp_pin, "mmc_wp")) { 1651 dev_dbg(&mmc->class_dev, "no WP pin available\n"); 1652 slot->wp_pin = -EBUSY; 1653 } 1654 } 1655 1656 host->slot[id] = slot; 1657 mmc_add_host(mmc); 1658 1659 if (gpio_is_valid(slot->detect_pin)) { 1660 int ret; 1661 1662 setup_timer(&slot->detect_timer, atmci_detect_change, 1663 (unsigned long)slot); 1664 1665 ret = request_irq(gpio_to_irq(slot->detect_pin), 1666 atmci_detect_interrupt, 1667 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, 1668 "mmc-detect", slot); 1669 if (ret) { 1670 dev_dbg(&mmc->class_dev, 1671 "could not request IRQ %d for detect pin\n", 1672 gpio_to_irq(slot->detect_pin)); 1673 gpio_free(slot->detect_pin); 1674 slot->detect_pin = -EBUSY; 1675 } 1676 } 1677 1678 atmci_init_debugfs(slot); 1679 1680 return 0; 1681} 1682 1683static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot, 1684 unsigned int id) 1685{ 1686 /* Debugfs stuff is cleaned up by mmc core */ 1687 1688 set_bit(ATMCI_SHUTDOWN, &slot->flags); 1689 smp_wmb(); 1690 1691 mmc_remove_host(slot->mmc); 1692 1693 if (gpio_is_valid(slot->detect_pin)) { 1694 int pin = slot->detect_pin; 1695 1696 free_irq(gpio_to_irq(pin), slot); 1697 del_timer_sync(&slot->detect_timer); 1698 gpio_free(pin); 1699 } 1700 if (gpio_is_valid(slot->wp_pin)) 1701 gpio_free(slot->wp_pin); 1702 1703 slot->host->slot[id] = NULL; 1704 mmc_free_host(slot->mmc); 1705} 1706 1707#ifdef CONFIG_MMC_ATMELMCI_DMA 1708static bool filter(struct dma_chan *chan, void *slave) 1709{ 1710 struct mci_dma_data *sl = slave; 1711 1712 if (sl && find_slave_dev(sl) == chan->device->dev) { 1713 chan->private = slave_data_ptr(sl); 1714 return true; 1715 } else { 1716 return false; 1717 } 1718} 1719 1720static void atmci_configure_dma(struct atmel_mci *host) 1721{ 1722 struct mci_platform_data *pdata; 1723 1724 if (host == NULL) 1725 return; 1726 1727 pdata = host->pdev->dev.platform_data; 1728 1729 if (pdata && find_slave_dev(pdata->dma_slave)) { 1730 dma_cap_mask_t mask; 1731 1732 setup_dma_addr(pdata->dma_slave, 1733 host->mapbase + MCI_TDR, 1734 host->mapbase + MCI_RDR); 1735 1736 /* Try to grab a DMA channel */ 1737 dma_cap_zero(mask); 1738 dma_cap_set(DMA_SLAVE, mask); 1739 host->dma.chan = 1740 dma_request_channel(mask, filter, pdata->dma_slave); 1741 } 1742 if (!host->dma.chan) 1743 dev_notice(&host->pdev->dev, "DMA not available, using PIO\n"); 1744 else 1745 dev_info(&host->pdev->dev, 1746 "Using %s for DMA transfers\n", 1747 dma_chan_name(host->dma.chan)); 1748} 1749#else 1750static void atmci_configure_dma(struct atmel_mci *host) {} 1751#endif 1752 1753static int __init atmci_probe(struct platform_device *pdev) 1754{ 1755 struct mci_platform_data *pdata; 1756 struct atmel_mci *host; 1757 struct resource *regs; 1758 unsigned int nr_slots; 1759 int irq; 1760 int ret; 1761 1762 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1763 if (!regs) 1764 return -ENXIO; 1765 pdata = pdev->dev.platform_data; 1766 if (!pdata) 1767 return -ENXIO; 1768 irq = platform_get_irq(pdev, 0); 1769 if (irq < 0) 1770 return irq; 1771 1772 host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL); 1773 if (!host) 1774 return -ENOMEM; 1775 1776 host->pdev = pdev; 1777 spin_lock_init(&host->lock); 1778 INIT_LIST_HEAD(&host->queue); 1779 1780 host->mck = clk_get(&pdev->dev, "mci_clk"); 1781 if (IS_ERR(host->mck)) { 1782 ret = PTR_ERR(host->mck); 1783 goto err_clk_get; 1784 } 1785 1786 ret = -ENOMEM; 1787 host->regs = ioremap(regs->start, resource_size(regs)); 1788 if (!host->regs) 1789 goto err_ioremap; 1790 1791 clk_enable(host->mck); 1792 mci_writel(host, CR, MCI_CR_SWRST); 1793 host->bus_hz = clk_get_rate(host->mck); 1794 clk_disable(host->mck); 1795 1796 host->mapbase = regs->start; 1797 1798 tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host); 1799 1800 ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host); 1801 if (ret) 1802 goto err_request_irq; 1803 1804 atmci_configure_dma(host); 1805 1806 platform_set_drvdata(pdev, host); 1807 1808 /* We need at least one slot to succeed */ 1809 nr_slots = 0; 1810 ret = -ENODEV; 1811 if (pdata->slot[0].bus_width) { 1812 ret = atmci_init_slot(host, &pdata->slot[0], 1813 0, MCI_SDCSEL_SLOT_A, MCI_SDIOIRQA); 1814 if (!ret) 1815 nr_slots++; 1816 } 1817 if (pdata->slot[1].bus_width) { 1818 ret = atmci_init_slot(host, &pdata->slot[1], 1819 1, MCI_SDCSEL_SLOT_B, MCI_SDIOIRQB); 1820 if (!ret) 1821 nr_slots++; 1822 } 1823 1824 if (!nr_slots) { 1825 dev_err(&pdev->dev, "init failed: no slot defined\n"); 1826 goto err_init_slot; 1827 } 1828 1829 dev_info(&pdev->dev, 1830 "Atmel MCI controller at 0x%08lx irq %d, %u slots\n", 1831 host->mapbase, irq, nr_slots); 1832 1833 return 0; 1834 1835err_init_slot: 1836#ifdef CONFIG_MMC_ATMELMCI_DMA 1837 if (host->dma.chan) 1838 dma_release_channel(host->dma.chan); 1839#endif 1840 free_irq(irq, host); 1841err_request_irq: 1842 iounmap(host->regs); 1843err_ioremap: 1844 clk_put(host->mck); 1845err_clk_get: 1846 kfree(host); 1847 return ret; 1848} 1849 1850static int __exit atmci_remove(struct platform_device *pdev) 1851{ 1852 struct atmel_mci *host = platform_get_drvdata(pdev); 1853 unsigned int i; 1854 1855 platform_set_drvdata(pdev, NULL); 1856 1857 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 1858 if (host->slot[i]) 1859 atmci_cleanup_slot(host->slot[i], i); 1860 } 1861 1862 clk_enable(host->mck); 1863 mci_writel(host, IDR, ~0UL); 1864 mci_writel(host, CR, MCI_CR_MCIDIS); 1865 mci_readl(host, SR); 1866 clk_disable(host->mck); 1867 1868#ifdef CONFIG_MMC_ATMELMCI_DMA 1869 if (host->dma.chan) 1870 dma_release_channel(host->dma.chan); 1871#endif 1872 1873 free_irq(platform_get_irq(pdev, 0), host); 1874 iounmap(host->regs); 1875 1876 clk_put(host->mck); 1877 kfree(host); 1878 1879 return 0; 1880} 1881 1882#ifdef CONFIG_PM 1883static int atmci_suspend(struct device *dev) 1884{ 1885 struct atmel_mci *host = dev_get_drvdata(dev); 1886 int i; 1887 1888 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 1889 struct atmel_mci_slot *slot = host->slot[i]; 1890 int ret; 1891 1892 if (!slot) 1893 continue; 1894 ret = mmc_suspend_host(slot->mmc); 1895 if (ret < 0) { 1896 while (--i >= 0) { 1897 slot = host->slot[i]; 1898 if (slot 1899 && test_bit(ATMCI_SUSPENDED, &slot->flags)) { 1900 mmc_resume_host(host->slot[i]->mmc); 1901 clear_bit(ATMCI_SUSPENDED, &slot->flags); 1902 } 1903 } 1904 return ret; 1905 } else { 1906 set_bit(ATMCI_SUSPENDED, &slot->flags); 1907 } 1908 } 1909 1910 return 0; 1911} 1912 1913static int atmci_resume(struct device *dev) 1914{ 1915 struct atmel_mci *host = dev_get_drvdata(dev); 1916 int i; 1917 int ret = 0; 1918 1919 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) { 1920 struct atmel_mci_slot *slot = host->slot[i]; 1921 int err; 1922 1923 slot = host->slot[i]; 1924 if (!slot) 1925 continue; 1926 if (!test_bit(ATMCI_SUSPENDED, &slot->flags)) 1927 continue; 1928 err = mmc_resume_host(slot->mmc); 1929 if (err < 0) 1930 ret = err; 1931 else 1932 clear_bit(ATMCI_SUSPENDED, &slot->flags); 1933 } 1934 1935 return ret; 1936} 1937static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume); 1938#define ATMCI_PM_OPS (&atmci_pm) 1939#else 1940#define ATMCI_PM_OPS NULL 1941#endif 1942 1943static struct platform_driver atmci_driver = { 1944 .remove = __exit_p(atmci_remove), 1945 .driver = { 1946 .name = "atmel_mci", 1947 .pm = ATMCI_PM_OPS, 1948 }, 1949}; 1950 1951static int __init atmci_init(void) 1952{ 1953 return platform_driver_probe(&atmci_driver, atmci_probe); 1954} 1955 1956static void __exit atmci_exit(void) 1957{ 1958 platform_driver_unregister(&atmci_driver); 1959} 1960 1961late_initcall(atmci_init); /* try to load after dma driver when built-in */ 1962module_exit(atmci_exit); 1963 1964MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver"); 1965MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); 1966MODULE_LICENSE("GPL v2"); 1967