1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/host/au1xmmc.c - AU1XX0 MMC driver 4 * 5 * Copyright (c) 2005, Advanced Micro Devices, Inc. 6 * 7 * Developed with help from the 2.4.30 MMC AU1XXX controller including 8 * the following copyright notices: 9 * Copyright (c) 2003-2004 Embedded Edge, LLC. 10 * Portions Copyright (C) 2002 Embedix, Inc 11 * Copyright 2002 Hewlett-Packard Company 12 13 * 2.6 version of this driver inspired by: 14 * (drivers/mmc/wbsd.c) Copyright (C) 2004-2005 Pierre Ossman, 15 * All Rights Reserved. 16 * (drivers/mmc/pxa.c) Copyright (C) 2003 Russell King, 17 * All Rights Reserved. 18 * 19 20 */ 21 22 /* Why don't we use the SD controllers' carddetect feature? 23 * 24 * From the AU1100 MMC application guide: 25 * If the Au1100-based design is intended to support both MultiMediaCards 26 * and 1- or 4-data bit SecureDigital cards, then the solution is to 27 * connect a weak (560KOhm) pull-up resistor to connector pin 1. 28 * In doing so, a MMC card never enters SPI-mode communications, 29 * but now the SecureDigital card-detect feature of CD/DAT3 is ineffective 30 * (the low to high transition will not occur). 31 */ 32 33 #include <linux/clk.h> 34 #include <linux/module.h> 35 #include <linux/init.h> 36 #include <linux/platform_device.h> 37 #include <linux/mm.h> 38 #include <linux/interrupt.h> 39 #include <linux/dma-mapping.h> 40 #include <linux/scatterlist.h> 41 #include <linux/highmem.h> 42 #include <linux/leds.h> 43 #include <linux/mmc/host.h> 44 #include <linux/slab.h> 45 46 #include <asm/io.h> 47 #include <asm/mach-au1x00/au1000.h> 48 #include <asm/mach-au1x00/au1xxx_dbdma.h> 49 #include <asm/mach-au1x00/au1100_mmc.h> 50 51 #define DRIVER_NAME "au1xxx-mmc" 52 53 /* Set this to enable special debugging macros */ 54 /* #define DEBUG */ 55 56 #ifdef DEBUG 57 #define DBG(fmt, idx, args...) \ 58 pr_debug("au1xmmc(%d): DEBUG: " fmt, idx, ##args) 59 #else 60 #define DBG(fmt, idx, args...) do {} while (0) 61 #endif 62 63 /* Hardware definitions */ 64 #define AU1XMMC_DESCRIPTOR_COUNT 1 65 66 /* max DMA seg size: 64KB on Au1100, 4MB on Au1200 */ 67 #define AU1100_MMC_DESCRIPTOR_SIZE 0x0000ffff 68 #define AU1200_MMC_DESCRIPTOR_SIZE 0x003fffff 69 70 #define AU1XMMC_OCR (MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 | \ 71 MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 | \ 72 MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36) 73 74 /* This gives us a hard value for the stop command that we can write directly 75 * to the command register. 76 */ 77 #define STOP_CMD \ 78 (SD_CMD_RT_1B | SD_CMD_CT_7 | (0xC << SD_CMD_CI_SHIFT) | SD_CMD_GO) 79 80 /* This is the set of interrupts that we configure by default. */ 81 #define AU1XMMC_INTERRUPTS \ 82 (SD_CONFIG_SC | SD_CONFIG_DT | SD_CONFIG_RAT | \ 83 SD_CONFIG_CR | SD_CONFIG_I) 84 85 /* The poll event (looking for insert/remove events runs twice a second. */ 86 #define AU1XMMC_DETECT_TIMEOUT (HZ/2) 87 88 struct au1xmmc_host { 89 struct mmc_host *mmc; 90 struct mmc_request *mrq; 91 92 u32 flags; 93 void __iomem *iobase; 94 u32 clock; 95 u32 bus_width; 96 u32 power_mode; 97 98 int status; 99 100 struct { 101 int len; 102 int dir; 103 } dma; 104 105 struct { 106 int index; 107 int offset; 108 int len; 109 } pio; 110 111 u32 tx_chan; 112 u32 rx_chan; 113 114 int irq; 115 116 struct tasklet_struct finish_task; 117 struct tasklet_struct data_task; 118 struct au1xmmc_platform_data *platdata; 119 struct platform_device *pdev; 120 struct resource *ioarea; 121 struct clk *clk; 122 }; 123 124 /* Status flags used by the host structure */ 125 #define HOST_F_XMIT 0x0001 126 #define HOST_F_RECV 0x0002 127 #define HOST_F_DMA 0x0010 128 #define HOST_F_DBDMA 0x0020 129 #define HOST_F_ACTIVE 0x0100 130 #define HOST_F_STOP 0x1000 131 132 #define HOST_S_IDLE 0x0001 133 #define HOST_S_CMD 0x0002 134 #define HOST_S_DATA 0x0003 135 #define HOST_S_STOP 0x0004 136 137 /* Easy access macros */ 138 #define HOST_STATUS(h) ((h)->iobase + SD_STATUS) 139 #define HOST_CONFIG(h) ((h)->iobase + SD_CONFIG) 140 #define HOST_ENABLE(h) ((h)->iobase + SD_ENABLE) 141 #define HOST_TXPORT(h) ((h)->iobase + SD_TXPORT) 142 #define HOST_RXPORT(h) ((h)->iobase + SD_RXPORT) 143 #define HOST_CMDARG(h) ((h)->iobase + SD_CMDARG) 144 #define HOST_BLKSIZE(h) ((h)->iobase + SD_BLKSIZE) 145 #define HOST_CMD(h) ((h)->iobase + SD_CMD) 146 #define HOST_CONFIG2(h) ((h)->iobase + SD_CONFIG2) 147 #define HOST_TIMEOUT(h) ((h)->iobase + SD_TIMEOUT) 148 #define HOST_DEBUG(h) ((h)->iobase + SD_DEBUG) 149 150 #define DMA_CHANNEL(h) \ 151 (((h)->flags & HOST_F_XMIT) ? (h)->tx_chan : (h)->rx_chan) 152 153 static inline int has_dbdma(void) 154 { 155 switch (alchemy_get_cputype()) { 156 case ALCHEMY_CPU_AU1200: 157 case ALCHEMY_CPU_AU1300: 158 return 1; 159 default: 160 return 0; 161 } 162 } 163 164 static inline void IRQ_ON(struct au1xmmc_host *host, u32 mask) 165 { 166 u32 val = __raw_readl(HOST_CONFIG(host)); 167 val |= mask; 168 __raw_writel(val, HOST_CONFIG(host)); 169 wmb(); /* drain writebuffer */ 170 } 171 172 static inline void FLUSH_FIFO(struct au1xmmc_host *host) 173 { 174 u32 val = __raw_readl(HOST_CONFIG2(host)); 175 176 __raw_writel(val | SD_CONFIG2_FF, HOST_CONFIG2(host)); 177 wmb(); /* drain writebuffer */ 178 mdelay(1); 179 180 /* SEND_STOP will turn off clock control - this re-enables it */ 181 val &= ~SD_CONFIG2_DF; 182 183 __raw_writel(val, HOST_CONFIG2(host)); 184 wmb(); /* drain writebuffer */ 185 } 186 187 static inline void IRQ_OFF(struct au1xmmc_host *host, u32 mask) 188 { 189 u32 val = __raw_readl(HOST_CONFIG(host)); 190 val &= ~mask; 191 __raw_writel(val, HOST_CONFIG(host)); 192 wmb(); /* drain writebuffer */ 193 } 194 195 static inline void SEND_STOP(struct au1xmmc_host *host) 196 { 197 u32 config2; 198 199 WARN_ON(host->status != HOST_S_DATA); 200 host->status = HOST_S_STOP; 201 202 config2 = __raw_readl(HOST_CONFIG2(host)); 203 __raw_writel(config2 | SD_CONFIG2_DF, HOST_CONFIG2(host)); 204 wmb(); /* drain writebuffer */ 205 206 /* Send the stop command */ 207 __raw_writel(STOP_CMD, HOST_CMD(host)); 208 wmb(); /* drain writebuffer */ 209 } 210 211 static void au1xmmc_set_power(struct au1xmmc_host *host, int state) 212 { 213 if (host->platdata && host->platdata->set_power) 214 host->platdata->set_power(host->mmc, state); 215 } 216 217 static int au1xmmc_card_inserted(struct mmc_host *mmc) 218 { 219 struct au1xmmc_host *host = mmc_priv(mmc); 220 221 if (host->platdata && host->platdata->card_inserted) 222 return !!host->platdata->card_inserted(host->mmc); 223 224 return -ENOSYS; 225 } 226 227 static int au1xmmc_card_readonly(struct mmc_host *mmc) 228 { 229 struct au1xmmc_host *host = mmc_priv(mmc); 230 231 if (host->platdata && host->platdata->card_readonly) 232 return !!host->platdata->card_readonly(mmc); 233 234 return -ENOSYS; 235 } 236 237 static void au1xmmc_finish_request(struct au1xmmc_host *host) 238 { 239 struct mmc_request *mrq = host->mrq; 240 241 host->mrq = NULL; 242 host->flags &= HOST_F_ACTIVE | HOST_F_DMA; 243 244 host->dma.len = 0; 245 host->dma.dir = 0; 246 247 host->pio.index = 0; 248 host->pio.offset = 0; 249 host->pio.len = 0; 250 251 host->status = HOST_S_IDLE; 252 253 mmc_request_done(host->mmc, mrq); 254 } 255 256 static void au1xmmc_tasklet_finish(struct tasklet_struct *t) 257 { 258 struct au1xmmc_host *host = from_tasklet(host, t, finish_task); 259 au1xmmc_finish_request(host); 260 } 261 262 static int au1xmmc_send_command(struct au1xmmc_host *host, 263 struct mmc_command *cmd, struct mmc_data *data) 264 { 265 u32 mmccmd = (cmd->opcode << SD_CMD_CI_SHIFT); 266 267 switch (mmc_resp_type(cmd)) { 268 case MMC_RSP_NONE: 269 break; 270 case MMC_RSP_R1: 271 mmccmd |= SD_CMD_RT_1; 272 break; 273 case MMC_RSP_R1B: 274 mmccmd |= SD_CMD_RT_1B; 275 break; 276 case MMC_RSP_R2: 277 mmccmd |= SD_CMD_RT_2; 278 break; 279 case MMC_RSP_R3: 280 mmccmd |= SD_CMD_RT_3; 281 break; 282 default: 283 pr_info("au1xmmc: unhandled response type %02x\n", 284 mmc_resp_type(cmd)); 285 return -EINVAL; 286 } 287 288 if (data) { 289 if (data->flags & MMC_DATA_READ) { 290 if (data->blocks > 1) 291 mmccmd |= SD_CMD_CT_4; 292 else 293 mmccmd |= SD_CMD_CT_2; 294 } else if (data->flags & MMC_DATA_WRITE) { 295 if (data->blocks > 1) 296 mmccmd |= SD_CMD_CT_3; 297 else 298 mmccmd |= SD_CMD_CT_1; 299 } 300 } 301 302 __raw_writel(cmd->arg, HOST_CMDARG(host)); 303 wmb(); /* drain writebuffer */ 304 305 __raw_writel((mmccmd | SD_CMD_GO), HOST_CMD(host)); 306 wmb(); /* drain writebuffer */ 307 308 /* Wait for the command to go on the line */ 309 while (__raw_readl(HOST_CMD(host)) & SD_CMD_GO) 310 /* nop */; 311 312 return 0; 313 } 314 315 static void au1xmmc_data_complete(struct au1xmmc_host *host, u32 status) 316 { 317 struct mmc_request *mrq = host->mrq; 318 struct mmc_data *data; 319 u32 crc; 320 321 WARN_ON((host->status != HOST_S_DATA) && (host->status != HOST_S_STOP)); 322 323 if (host->mrq == NULL) 324 return; 325 326 data = mrq->cmd->data; 327 328 if (status == 0) 329 status = __raw_readl(HOST_STATUS(host)); 330 331 /* The transaction is really over when the SD_STATUS_DB bit is clear */ 332 while ((host->flags & HOST_F_XMIT) && (status & SD_STATUS_DB)) 333 status = __raw_readl(HOST_STATUS(host)); 334 335 data->error = 0; 336 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma.dir); 337 338 /* Process any errors */ 339 crc = (status & (SD_STATUS_WC | SD_STATUS_RC)); 340 if (host->flags & HOST_F_XMIT) 341 crc |= ((status & 0x07) == 0x02) ? 0 : 1; 342 343 if (crc) 344 data->error = -EILSEQ; 345 346 /* Clear the CRC bits */ 347 __raw_writel(SD_STATUS_WC | SD_STATUS_RC, HOST_STATUS(host)); 348 349 data->bytes_xfered = 0; 350 351 if (!data->error) { 352 if (host->flags & (HOST_F_DMA | HOST_F_DBDMA)) { 353 u32 chan = DMA_CHANNEL(host); 354 355 chan_tab_t *c = *((chan_tab_t **)chan); 356 au1x_dma_chan_t *cp = c->chan_ptr; 357 data->bytes_xfered = cp->ddma_bytecnt; 358 } else 359 data->bytes_xfered = 360 (data->blocks * data->blksz) - host->pio.len; 361 } 362 363 au1xmmc_finish_request(host); 364 } 365 366 static void au1xmmc_tasklet_data(struct tasklet_struct *t) 367 { 368 struct au1xmmc_host *host = from_tasklet(host, t, data_task); 369 370 u32 status = __raw_readl(HOST_STATUS(host)); 371 au1xmmc_data_complete(host, status); 372 } 373 374 #define AU1XMMC_MAX_TRANSFER 8 375 376 static void au1xmmc_send_pio(struct au1xmmc_host *host) 377 { 378 struct mmc_data *data; 379 int sg_len, max, count; 380 unsigned char *sg_ptr, val; 381 u32 status; 382 struct scatterlist *sg; 383 384 data = host->mrq->data; 385 386 if (!(host->flags & HOST_F_XMIT)) 387 return; 388 389 /* This is the pointer to the data buffer */ 390 sg = &data->sg[host->pio.index]; 391 sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset; 392 393 /* This is the space left inside the buffer */ 394 sg_len = data->sg[host->pio.index].length - host->pio.offset; 395 396 /* Check if we need less than the size of the sg_buffer */ 397 max = (sg_len > host->pio.len) ? host->pio.len : sg_len; 398 if (max > AU1XMMC_MAX_TRANSFER) 399 max = AU1XMMC_MAX_TRANSFER; 400 401 for (count = 0; count < max; count++) { 402 status = __raw_readl(HOST_STATUS(host)); 403 404 if (!(status & SD_STATUS_TH)) 405 break; 406 407 val = sg_ptr[count]; 408 409 __raw_writel((unsigned long)val, HOST_TXPORT(host)); 410 wmb(); /* drain writebuffer */ 411 } 412 kunmap_atomic(sg_ptr); 413 414 host->pio.len -= count; 415 host->pio.offset += count; 416 417 if (count == sg_len) { 418 host->pio.index++; 419 host->pio.offset = 0; 420 } 421 422 if (host->pio.len == 0) { 423 IRQ_OFF(host, SD_CONFIG_TH); 424 425 if (host->flags & HOST_F_STOP) 426 SEND_STOP(host); 427 428 tasklet_schedule(&host->data_task); 429 } 430 } 431 432 static void au1xmmc_receive_pio(struct au1xmmc_host *host) 433 { 434 struct mmc_data *data; 435 int max, count, sg_len = 0; 436 unsigned char *sg_ptr = NULL; 437 u32 status, val; 438 struct scatterlist *sg; 439 440 data = host->mrq->data; 441 442 if (!(host->flags & HOST_F_RECV)) 443 return; 444 445 max = host->pio.len; 446 447 if (host->pio.index < host->dma.len) { 448 sg = &data->sg[host->pio.index]; 449 sg_ptr = kmap_atomic(sg_page(sg)) + sg->offset + host->pio.offset; 450 451 /* This is the space left inside the buffer */ 452 sg_len = sg_dma_len(&data->sg[host->pio.index]) - host->pio.offset; 453 454 /* Check if we need less than the size of the sg_buffer */ 455 if (sg_len < max) 456 max = sg_len; 457 } 458 459 if (max > AU1XMMC_MAX_TRANSFER) 460 max = AU1XMMC_MAX_TRANSFER; 461 462 for (count = 0; count < max; count++) { 463 status = __raw_readl(HOST_STATUS(host)); 464 465 if (!(status & SD_STATUS_NE)) 466 break; 467 468 if (status & SD_STATUS_RC) { 469 DBG("RX CRC Error [%d + %d].\n", host->pdev->id, 470 host->pio.len, count); 471 break; 472 } 473 474 if (status & SD_STATUS_RO) { 475 DBG("RX Overrun [%d + %d]\n", host->pdev->id, 476 host->pio.len, count); 477 break; 478 } 479 else if (status & SD_STATUS_RU) { 480 DBG("RX Underrun [%d + %d]\n", host->pdev->id, 481 host->pio.len, count); 482 break; 483 } 484 485 val = __raw_readl(HOST_RXPORT(host)); 486 487 if (sg_ptr) 488 sg_ptr[count] = (unsigned char)(val & 0xFF); 489 } 490 if (sg_ptr) 491 kunmap_atomic(sg_ptr); 492 493 host->pio.len -= count; 494 host->pio.offset += count; 495 496 if (sg_len && count == sg_len) { 497 host->pio.index++; 498 host->pio.offset = 0; 499 } 500 501 if (host->pio.len == 0) { 502 /* IRQ_OFF(host, SD_CONFIG_RA | SD_CONFIG_RF); */ 503 IRQ_OFF(host, SD_CONFIG_NE); 504 505 if (host->flags & HOST_F_STOP) 506 SEND_STOP(host); 507 508 tasklet_schedule(&host->data_task); 509 } 510 } 511 512 /* This is called when a command has been completed - grab the response 513 * and check for errors. Then start the data transfer if it is indicated. 514 */ 515 static void au1xmmc_cmd_complete(struct au1xmmc_host *host, u32 status) 516 { 517 struct mmc_request *mrq = host->mrq; 518 struct mmc_command *cmd; 519 u32 r[4]; 520 int i, trans; 521 522 if (!host->mrq) 523 return; 524 525 cmd = mrq->cmd; 526 cmd->error = 0; 527 528 if (cmd->flags & MMC_RSP_PRESENT) { 529 if (cmd->flags & MMC_RSP_136) { 530 r[0] = __raw_readl(host->iobase + SD_RESP3); 531 r[1] = __raw_readl(host->iobase + SD_RESP2); 532 r[2] = __raw_readl(host->iobase + SD_RESP1); 533 r[3] = __raw_readl(host->iobase + SD_RESP0); 534 535 /* The CRC is omitted from the response, so really 536 * we only got 120 bytes, but the engine expects 537 * 128 bits, so we have to shift things up. 538 */ 539 for (i = 0; i < 4; i++) { 540 cmd->resp[i] = (r[i] & 0x00FFFFFF) << 8; 541 if (i != 3) 542 cmd->resp[i] |= (r[i + 1] & 0xFF000000) >> 24; 543 } 544 } else { 545 /* Techincally, we should be getting all 48 bits of 546 * the response (SD_RESP1 + SD_RESP2), but because 547 * our response omits the CRC, our data ends up 548 * being shifted 8 bits to the right. In this case, 549 * that means that the OSR data starts at bit 31, 550 * so we can just read RESP0 and return that. 551 */ 552 cmd->resp[0] = __raw_readl(host->iobase + SD_RESP0); 553 } 554 } 555 556 /* Figure out errors */ 557 if (status & (SD_STATUS_SC | SD_STATUS_WC | SD_STATUS_RC)) 558 cmd->error = -EILSEQ; 559 560 trans = host->flags & (HOST_F_XMIT | HOST_F_RECV); 561 562 if (!trans || cmd->error) { 563 IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF); 564 tasklet_schedule(&host->finish_task); 565 return; 566 } 567 568 host->status = HOST_S_DATA; 569 570 if ((host->flags & (HOST_F_DMA | HOST_F_DBDMA))) { 571 u32 channel = DMA_CHANNEL(host); 572 573 /* Start the DBDMA as soon as the buffer gets something in it */ 574 575 if (host->flags & HOST_F_RECV) { 576 u32 mask = SD_STATUS_DB | SD_STATUS_NE; 577 578 while((status & mask) != mask) 579 status = __raw_readl(HOST_STATUS(host)); 580 } 581 582 au1xxx_dbdma_start(channel); 583 } 584 } 585 586 static void au1xmmc_set_clock(struct au1xmmc_host *host, int rate) 587 { 588 unsigned int pbus = clk_get_rate(host->clk); 589 unsigned int divisor = ((pbus / rate) / 2) - 1; 590 u32 config; 591 592 config = __raw_readl(HOST_CONFIG(host)); 593 594 config &= ~(SD_CONFIG_DIV); 595 config |= (divisor & SD_CONFIG_DIV) | SD_CONFIG_DE; 596 597 __raw_writel(config, HOST_CONFIG(host)); 598 wmb(); /* drain writebuffer */ 599 } 600 601 static int au1xmmc_prepare_data(struct au1xmmc_host *host, 602 struct mmc_data *data) 603 { 604 int datalen = data->blocks * data->blksz; 605 606 if (data->flags & MMC_DATA_READ) 607 host->flags |= HOST_F_RECV; 608 else 609 host->flags |= HOST_F_XMIT; 610 611 if (host->mrq->stop) 612 host->flags |= HOST_F_STOP; 613 614 host->dma.dir = DMA_BIDIRECTIONAL; 615 616 host->dma.len = dma_map_sg(mmc_dev(host->mmc), data->sg, 617 data->sg_len, host->dma.dir); 618 619 if (host->dma.len == 0) 620 return -ETIMEDOUT; 621 622 __raw_writel(data->blksz - 1, HOST_BLKSIZE(host)); 623 624 if (host->flags & (HOST_F_DMA | HOST_F_DBDMA)) { 625 int i; 626 u32 channel = DMA_CHANNEL(host); 627 628 au1xxx_dbdma_stop(channel); 629 630 for (i = 0; i < host->dma.len; i++) { 631 u32 ret = 0, flags = DDMA_FLAGS_NOIE; 632 struct scatterlist *sg = &data->sg[i]; 633 int sg_len = sg->length; 634 635 int len = (datalen > sg_len) ? sg_len : datalen; 636 637 if (i == host->dma.len - 1) 638 flags = DDMA_FLAGS_IE; 639 640 if (host->flags & HOST_F_XMIT) { 641 ret = au1xxx_dbdma_put_source(channel, 642 sg_phys(sg), len, flags); 643 } else { 644 ret = au1xxx_dbdma_put_dest(channel, 645 sg_phys(sg), len, flags); 646 } 647 648 if (!ret) 649 goto dataerr; 650 651 datalen -= len; 652 } 653 } else { 654 host->pio.index = 0; 655 host->pio.offset = 0; 656 host->pio.len = datalen; 657 658 if (host->flags & HOST_F_XMIT) 659 IRQ_ON(host, SD_CONFIG_TH); 660 else 661 IRQ_ON(host, SD_CONFIG_NE); 662 /* IRQ_ON(host, SD_CONFIG_RA | SD_CONFIG_RF); */ 663 } 664 665 return 0; 666 667 dataerr: 668 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, 669 host->dma.dir); 670 return -ETIMEDOUT; 671 } 672 673 /* This actually starts a command or data transaction */ 674 static void au1xmmc_request(struct mmc_host* mmc, struct mmc_request* mrq) 675 { 676 struct au1xmmc_host *host = mmc_priv(mmc); 677 int ret = 0; 678 679 WARN_ON(irqs_disabled()); 680 WARN_ON(host->status != HOST_S_IDLE); 681 682 host->mrq = mrq; 683 host->status = HOST_S_CMD; 684 685 /* fail request immediately if no card is present */ 686 if (0 == au1xmmc_card_inserted(mmc)) { 687 mrq->cmd->error = -ENOMEDIUM; 688 au1xmmc_finish_request(host); 689 return; 690 } 691 692 if (mrq->data) { 693 FLUSH_FIFO(host); 694 ret = au1xmmc_prepare_data(host, mrq->data); 695 } 696 697 if (!ret) 698 ret = au1xmmc_send_command(host, mrq->cmd, mrq->data); 699 700 if (ret) { 701 mrq->cmd->error = ret; 702 au1xmmc_finish_request(host); 703 } 704 } 705 706 static void au1xmmc_reset_controller(struct au1xmmc_host *host) 707 { 708 /* Apply the clock */ 709 __raw_writel(SD_ENABLE_CE, HOST_ENABLE(host)); 710 wmb(); /* drain writebuffer */ 711 mdelay(1); 712 713 __raw_writel(SD_ENABLE_R | SD_ENABLE_CE, HOST_ENABLE(host)); 714 wmb(); /* drain writebuffer */ 715 mdelay(5); 716 717 __raw_writel(~0, HOST_STATUS(host)); 718 wmb(); /* drain writebuffer */ 719 720 __raw_writel(0, HOST_BLKSIZE(host)); 721 __raw_writel(0x001fffff, HOST_TIMEOUT(host)); 722 wmb(); /* drain writebuffer */ 723 724 __raw_writel(SD_CONFIG2_EN, HOST_CONFIG2(host)); 725 wmb(); /* drain writebuffer */ 726 727 __raw_writel(SD_CONFIG2_EN | SD_CONFIG2_FF, HOST_CONFIG2(host)); 728 wmb(); /* drain writebuffer */ 729 mdelay(1); 730 731 __raw_writel(SD_CONFIG2_EN, HOST_CONFIG2(host)); 732 wmb(); /* drain writebuffer */ 733 734 /* Configure interrupts */ 735 __raw_writel(AU1XMMC_INTERRUPTS, HOST_CONFIG(host)); 736 wmb(); /* drain writebuffer */ 737 } 738 739 740 static void au1xmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 741 { 742 struct au1xmmc_host *host = mmc_priv(mmc); 743 u32 config2; 744 745 if (ios->power_mode == MMC_POWER_OFF) 746 au1xmmc_set_power(host, 0); 747 else if (ios->power_mode == MMC_POWER_ON) { 748 au1xmmc_set_power(host, 1); 749 } 750 751 if (ios->clock && ios->clock != host->clock) { 752 au1xmmc_set_clock(host, ios->clock); 753 host->clock = ios->clock; 754 } 755 756 config2 = __raw_readl(HOST_CONFIG2(host)); 757 switch (ios->bus_width) { 758 case MMC_BUS_WIDTH_8: 759 config2 |= SD_CONFIG2_BB; 760 break; 761 case MMC_BUS_WIDTH_4: 762 config2 &= ~SD_CONFIG2_BB; 763 config2 |= SD_CONFIG2_WB; 764 break; 765 case MMC_BUS_WIDTH_1: 766 config2 &= ~(SD_CONFIG2_WB | SD_CONFIG2_BB); 767 break; 768 } 769 __raw_writel(config2, HOST_CONFIG2(host)); 770 wmb(); /* drain writebuffer */ 771 } 772 773 #define STATUS_TIMEOUT (SD_STATUS_RAT | SD_STATUS_DT) 774 #define STATUS_DATA_IN (SD_STATUS_NE) 775 #define STATUS_DATA_OUT (SD_STATUS_TH) 776 777 static irqreturn_t au1xmmc_irq(int irq, void *dev_id) 778 { 779 struct au1xmmc_host *host = dev_id; 780 u32 status; 781 782 status = __raw_readl(HOST_STATUS(host)); 783 784 if (!(status & SD_STATUS_I)) 785 return IRQ_NONE; /* not ours */ 786 787 if (status & SD_STATUS_SI) /* SDIO */ 788 mmc_signal_sdio_irq(host->mmc); 789 790 if (host->mrq && (status & STATUS_TIMEOUT)) { 791 if (status & SD_STATUS_RAT) 792 host->mrq->cmd->error = -ETIMEDOUT; 793 else if (status & SD_STATUS_DT) 794 host->mrq->data->error = -ETIMEDOUT; 795 796 /* In PIO mode, interrupts might still be enabled */ 797 IRQ_OFF(host, SD_CONFIG_NE | SD_CONFIG_TH); 798 799 /* IRQ_OFF(host, SD_CONFIG_TH | SD_CONFIG_RA | SD_CONFIG_RF); */ 800 tasklet_schedule(&host->finish_task); 801 } 802 #if 0 803 else if (status & SD_STATUS_DD) { 804 /* Sometimes we get a DD before a NE in PIO mode */ 805 if (!(host->flags & HOST_F_DMA) && (status & SD_STATUS_NE)) 806 au1xmmc_receive_pio(host); 807 else { 808 au1xmmc_data_complete(host, status); 809 /* tasklet_schedule(&host->data_task); */ 810 } 811 } 812 #endif 813 else if (status & SD_STATUS_CR) { 814 if (host->status == HOST_S_CMD) 815 au1xmmc_cmd_complete(host, status); 816 817 } else if (!(host->flags & HOST_F_DMA)) { 818 if ((host->flags & HOST_F_XMIT) && (status & STATUS_DATA_OUT)) 819 au1xmmc_send_pio(host); 820 else if ((host->flags & HOST_F_RECV) && (status & STATUS_DATA_IN)) 821 au1xmmc_receive_pio(host); 822 823 } else if (status & 0x203F3C70) { 824 DBG("Unhandled status %8.8x\n", host->pdev->id, 825 status); 826 } 827 828 __raw_writel(status, HOST_STATUS(host)); 829 wmb(); /* drain writebuffer */ 830 831 return IRQ_HANDLED; 832 } 833 834 /* 8bit memory DMA device */ 835 static dbdev_tab_t au1xmmc_mem_dbdev = { 836 .dev_id = DSCR_CMD0_ALWAYS, 837 .dev_flags = DEV_FLAGS_ANYUSE, 838 .dev_tsize = 0, 839 .dev_devwidth = 8, 840 .dev_physaddr = 0x00000000, 841 .dev_intlevel = 0, 842 .dev_intpolarity = 0, 843 }; 844 static int memid; 845 846 static void au1xmmc_dbdma_callback(int irq, void *dev_id) 847 { 848 struct au1xmmc_host *host = (struct au1xmmc_host *)dev_id; 849 850 /* Avoid spurious interrupts */ 851 if (!host->mrq) 852 return; 853 854 if (host->flags & HOST_F_STOP) 855 SEND_STOP(host); 856 857 tasklet_schedule(&host->data_task); 858 } 859 860 static int au1xmmc_dbdma_init(struct au1xmmc_host *host) 861 { 862 struct resource *res; 863 int txid, rxid; 864 865 res = platform_get_resource(host->pdev, IORESOURCE_DMA, 0); 866 if (!res) 867 return -ENODEV; 868 txid = res->start; 869 870 res = platform_get_resource(host->pdev, IORESOURCE_DMA, 1); 871 if (!res) 872 return -ENODEV; 873 rxid = res->start; 874 875 if (!memid) 876 return -ENODEV; 877 878 host->tx_chan = au1xxx_dbdma_chan_alloc(memid, txid, 879 au1xmmc_dbdma_callback, (void *)host); 880 if (!host->tx_chan) { 881 dev_err(&host->pdev->dev, "cannot allocate TX DMA\n"); 882 return -ENODEV; 883 } 884 885 host->rx_chan = au1xxx_dbdma_chan_alloc(rxid, memid, 886 au1xmmc_dbdma_callback, (void *)host); 887 if (!host->rx_chan) { 888 dev_err(&host->pdev->dev, "cannot allocate RX DMA\n"); 889 au1xxx_dbdma_chan_free(host->tx_chan); 890 return -ENODEV; 891 } 892 893 au1xxx_dbdma_set_devwidth(host->tx_chan, 8); 894 au1xxx_dbdma_set_devwidth(host->rx_chan, 8); 895 896 au1xxx_dbdma_ring_alloc(host->tx_chan, AU1XMMC_DESCRIPTOR_COUNT); 897 au1xxx_dbdma_ring_alloc(host->rx_chan, AU1XMMC_DESCRIPTOR_COUNT); 898 899 /* DBDMA is good to go */ 900 host->flags |= HOST_F_DMA | HOST_F_DBDMA; 901 902 return 0; 903 } 904 905 static void au1xmmc_dbdma_shutdown(struct au1xmmc_host *host) 906 { 907 if (host->flags & HOST_F_DMA) { 908 host->flags &= ~HOST_F_DMA; 909 au1xxx_dbdma_chan_free(host->tx_chan); 910 au1xxx_dbdma_chan_free(host->rx_chan); 911 } 912 } 913 914 static void au1xmmc_enable_sdio_irq(struct mmc_host *mmc, int en) 915 { 916 struct au1xmmc_host *host = mmc_priv(mmc); 917 918 if (en) 919 IRQ_ON(host, SD_CONFIG_SI); 920 else 921 IRQ_OFF(host, SD_CONFIG_SI); 922 } 923 924 static const struct mmc_host_ops au1xmmc_ops = { 925 .request = au1xmmc_request, 926 .set_ios = au1xmmc_set_ios, 927 .get_ro = au1xmmc_card_readonly, 928 .get_cd = au1xmmc_card_inserted, 929 .enable_sdio_irq = au1xmmc_enable_sdio_irq, 930 }; 931 932 static int au1xmmc_probe(struct platform_device *pdev) 933 { 934 struct mmc_host *mmc; 935 struct au1xmmc_host *host; 936 struct resource *r; 937 int ret, iflag; 938 939 mmc = mmc_alloc_host(sizeof(struct au1xmmc_host), &pdev->dev); 940 if (!mmc) { 941 dev_err(&pdev->dev, "no memory for mmc_host\n"); 942 ret = -ENOMEM; 943 goto out0; 944 } 945 946 host = mmc_priv(mmc); 947 host->mmc = mmc; 948 host->platdata = pdev->dev.platform_data; 949 host->pdev = pdev; 950 951 ret = -ENODEV; 952 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 953 if (!r) { 954 dev_err(&pdev->dev, "no mmio defined\n"); 955 goto out1; 956 } 957 958 host->ioarea = request_mem_region(r->start, resource_size(r), 959 pdev->name); 960 if (!host->ioarea) { 961 dev_err(&pdev->dev, "mmio already in use\n"); 962 goto out1; 963 } 964 965 host->iobase = ioremap(r->start, 0x3c); 966 if (!host->iobase) { 967 dev_err(&pdev->dev, "cannot remap mmio\n"); 968 goto out2; 969 } 970 971 host->irq = platform_get_irq(pdev, 0); 972 if (host->irq < 0) 973 goto out3; 974 975 mmc->ops = &au1xmmc_ops; 976 977 mmc->f_min = 450000; 978 mmc->f_max = 24000000; 979 980 mmc->max_blk_size = 2048; 981 mmc->max_blk_count = 512; 982 983 mmc->ocr_avail = AU1XMMC_OCR; 984 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 985 mmc->max_segs = AU1XMMC_DESCRIPTOR_COUNT; 986 987 iflag = IRQF_SHARED; /* Au1100/Au1200: one int for both ctrls */ 988 989 switch (alchemy_get_cputype()) { 990 case ALCHEMY_CPU_AU1100: 991 mmc->max_seg_size = AU1100_MMC_DESCRIPTOR_SIZE; 992 break; 993 case ALCHEMY_CPU_AU1200: 994 mmc->max_seg_size = AU1200_MMC_DESCRIPTOR_SIZE; 995 break; 996 case ALCHEMY_CPU_AU1300: 997 iflag = 0; /* nothing is shared */ 998 mmc->max_seg_size = AU1200_MMC_DESCRIPTOR_SIZE; 999 mmc->f_max = 52000000; 1000 if (host->ioarea->start == AU1100_SD0_PHYS_ADDR) 1001 mmc->caps |= MMC_CAP_8_BIT_DATA; 1002 break; 1003 } 1004 1005 ret = request_irq(host->irq, au1xmmc_irq, iflag, DRIVER_NAME, host); 1006 if (ret) { 1007 dev_err(&pdev->dev, "cannot grab IRQ\n"); 1008 goto out3; 1009 } 1010 1011 host->clk = clk_get(&pdev->dev, ALCHEMY_PERIPH_CLK); 1012 if (IS_ERR(host->clk)) { 1013 dev_err(&pdev->dev, "cannot find clock\n"); 1014 ret = PTR_ERR(host->clk); 1015 goto out_irq; 1016 } 1017 1018 ret = clk_prepare_enable(host->clk); 1019 if (ret) { 1020 dev_err(&pdev->dev, "cannot enable clock\n"); 1021 goto out_clk; 1022 } 1023 1024 host->status = HOST_S_IDLE; 1025 1026 /* board-specific carddetect setup, if any */ 1027 if (host->platdata && host->platdata->cd_setup) { 1028 ret = host->platdata->cd_setup(mmc, 1); 1029 if (ret) { 1030 dev_warn(&pdev->dev, "board CD setup failed\n"); 1031 mmc->caps |= MMC_CAP_NEEDS_POLL; 1032 } 1033 } else 1034 mmc->caps |= MMC_CAP_NEEDS_POLL; 1035 1036 /* platform may not be able to use all advertised caps */ 1037 if (host->platdata) 1038 mmc->caps &= ~(host->platdata->mask_host_caps); 1039 1040 tasklet_setup(&host->data_task, au1xmmc_tasklet_data); 1041 1042 tasklet_setup(&host->finish_task, au1xmmc_tasklet_finish); 1043 1044 if (has_dbdma()) { 1045 ret = au1xmmc_dbdma_init(host); 1046 if (ret) 1047 pr_info(DRIVER_NAME ": DBDMA init failed; using PIO\n"); 1048 } 1049 1050 #ifdef CONFIG_LEDS_CLASS 1051 if (host->platdata && host->platdata->led) { 1052 struct led_classdev *led = host->platdata->led; 1053 led->name = mmc_hostname(mmc); 1054 led->brightness = LED_OFF; 1055 led->default_trigger = mmc_hostname(mmc); 1056 ret = led_classdev_register(mmc_dev(mmc), led); 1057 if (ret) 1058 goto out5; 1059 } 1060 #endif 1061 1062 au1xmmc_reset_controller(host); 1063 1064 ret = mmc_add_host(mmc); 1065 if (ret) { 1066 dev_err(&pdev->dev, "cannot add mmc host\n"); 1067 goto out6; 1068 } 1069 1070 platform_set_drvdata(pdev, host); 1071 1072 pr_info(DRIVER_NAME ": MMC Controller %d set up at %p" 1073 " (mode=%s)\n", pdev->id, host->iobase, 1074 host->flags & HOST_F_DMA ? "dma" : "pio"); 1075 1076 return 0; /* all ok */ 1077 1078 out6: 1079 #ifdef CONFIG_LEDS_CLASS 1080 if (host->platdata && host->platdata->led) 1081 led_classdev_unregister(host->platdata->led); 1082 out5: 1083 #endif 1084 __raw_writel(0, HOST_ENABLE(host)); 1085 __raw_writel(0, HOST_CONFIG(host)); 1086 __raw_writel(0, HOST_CONFIG2(host)); 1087 wmb(); /* drain writebuffer */ 1088 1089 if (host->flags & HOST_F_DBDMA) 1090 au1xmmc_dbdma_shutdown(host); 1091 1092 tasklet_kill(&host->data_task); 1093 tasklet_kill(&host->finish_task); 1094 1095 if (host->platdata && host->platdata->cd_setup && 1096 !(mmc->caps & MMC_CAP_NEEDS_POLL)) 1097 host->platdata->cd_setup(mmc, 0); 1098 out_clk: 1099 clk_disable_unprepare(host->clk); 1100 clk_put(host->clk); 1101 out_irq: 1102 free_irq(host->irq, host); 1103 out3: 1104 iounmap((void *)host->iobase); 1105 out2: 1106 release_resource(host->ioarea); 1107 kfree(host->ioarea); 1108 out1: 1109 mmc_free_host(mmc); 1110 out0: 1111 return ret; 1112 } 1113 1114 static int au1xmmc_remove(struct platform_device *pdev) 1115 { 1116 struct au1xmmc_host *host = platform_get_drvdata(pdev); 1117 1118 if (host) { 1119 mmc_remove_host(host->mmc); 1120 1121 #ifdef CONFIG_LEDS_CLASS 1122 if (host->platdata && host->platdata->led) 1123 led_classdev_unregister(host->platdata->led); 1124 #endif 1125 1126 if (host->platdata && host->platdata->cd_setup && 1127 !(host->mmc->caps & MMC_CAP_NEEDS_POLL)) 1128 host->platdata->cd_setup(host->mmc, 0); 1129 1130 __raw_writel(0, HOST_ENABLE(host)); 1131 __raw_writel(0, HOST_CONFIG(host)); 1132 __raw_writel(0, HOST_CONFIG2(host)); 1133 wmb(); /* drain writebuffer */ 1134 1135 tasklet_kill(&host->data_task); 1136 tasklet_kill(&host->finish_task); 1137 1138 if (host->flags & HOST_F_DBDMA) 1139 au1xmmc_dbdma_shutdown(host); 1140 1141 au1xmmc_set_power(host, 0); 1142 1143 clk_disable_unprepare(host->clk); 1144 clk_put(host->clk); 1145 1146 free_irq(host->irq, host); 1147 iounmap((void *)host->iobase); 1148 release_resource(host->ioarea); 1149 kfree(host->ioarea); 1150 1151 mmc_free_host(host->mmc); 1152 } 1153 return 0; 1154 } 1155 1156 #ifdef CONFIG_PM 1157 static int au1xmmc_suspend(struct platform_device *pdev, pm_message_t state) 1158 { 1159 struct au1xmmc_host *host = platform_get_drvdata(pdev); 1160 1161 __raw_writel(0, HOST_CONFIG2(host)); 1162 __raw_writel(0, HOST_CONFIG(host)); 1163 __raw_writel(0xffffffff, HOST_STATUS(host)); 1164 __raw_writel(0, HOST_ENABLE(host)); 1165 wmb(); /* drain writebuffer */ 1166 1167 return 0; 1168 } 1169 1170 static int au1xmmc_resume(struct platform_device *pdev) 1171 { 1172 struct au1xmmc_host *host = platform_get_drvdata(pdev); 1173 1174 au1xmmc_reset_controller(host); 1175 1176 return 0; 1177 } 1178 #else 1179 #define au1xmmc_suspend NULL 1180 #define au1xmmc_resume NULL 1181 #endif 1182 1183 static struct platform_driver au1xmmc_driver = { 1184 .probe = au1xmmc_probe, 1185 .remove = au1xmmc_remove, 1186 .suspend = au1xmmc_suspend, 1187 .resume = au1xmmc_resume, 1188 .driver = { 1189 .name = DRIVER_NAME, 1190 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1191 }, 1192 }; 1193 1194 static int __init au1xmmc_init(void) 1195 { 1196 if (has_dbdma()) { 1197 /* DSCR_CMD0_ALWAYS has a stride of 32 bits, we need a stride 1198 * of 8 bits. And since devices are shared, we need to create 1199 * our own to avoid freaking out other devices. 1200 */ 1201 memid = au1xxx_ddma_add_device(&au1xmmc_mem_dbdev); 1202 if (!memid) 1203 pr_err("au1xmmc: cannot add memory dbdma\n"); 1204 } 1205 return platform_driver_register(&au1xmmc_driver); 1206 } 1207 1208 static void __exit au1xmmc_exit(void) 1209 { 1210 if (has_dbdma() && memid) 1211 au1xxx_ddma_del_device(memid); 1212 1213 platform_driver_unregister(&au1xmmc_driver); 1214 } 1215 1216 module_init(au1xmmc_init); 1217 module_exit(au1xmmc_exit); 1218 1219 MODULE_AUTHOR("Advanced Micro Devices, Inc"); 1220 MODULE_DESCRIPTION("MMC/SD driver for the Alchemy Au1XXX"); 1221 MODULE_LICENSE("GPL"); 1222 MODULE_ALIAS("platform:au1xxx-mmc"); 1223