1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018 Oleksij Rempel <linux@rempel-privat.de> 4 * 5 * Driver for Alcor Micro AU6601 and AU6621 controllers 6 */ 7 8 /* Note: this driver was created without any documentation. Based 9 * on sniffing, testing and in some cases mimic of original driver. 10 * As soon as some one with documentation or more experience in SD/MMC, or 11 * reverse engineering then me, please review this driver and question every 12 * thing what I did. 2018 Oleksij Rempel <linux@rempel-privat.de> 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/pci.h> 17 #include <linux/module.h> 18 #include <linux/io.h> 19 #include <linux/pm.h> 20 #include <linux/irq.h> 21 #include <linux/interrupt.h> 22 #include <linux/platform_device.h> 23 24 #include <linux/mmc/host.h> 25 #include <linux/mmc/mmc.h> 26 27 #include <linux/alcor_pci.h> 28 29 enum alcor_cookie { 30 COOKIE_UNMAPPED, 31 COOKIE_PRE_MAPPED, 32 COOKIE_MAPPED, 33 }; 34 35 struct alcor_pll_conf { 36 unsigned int clk_src_freq; 37 unsigned int clk_src_reg; 38 unsigned int min_div; 39 unsigned int max_div; 40 }; 41 42 struct alcor_sdmmc_host { 43 struct device *dev; 44 struct alcor_pci_priv *alcor_pci; 45 46 struct mmc_request *mrq; 47 struct mmc_command *cmd; 48 struct mmc_data *data; 49 unsigned int dma_on:1; 50 51 struct mutex cmd_mutex; 52 53 struct delayed_work timeout_work; 54 55 struct sg_mapping_iter sg_miter; /* SG state for PIO */ 56 struct scatterlist *sg; 57 unsigned int blocks; /* remaining PIO blocks */ 58 int sg_count; 59 60 u32 irq_status_sd; 61 unsigned char cur_power_mode; 62 }; 63 64 static const struct alcor_pll_conf alcor_pll_cfg[] = { 65 /* MHZ, CLK src, max div, min div */ 66 { 31250000, AU6601_CLK_31_25_MHZ, 1, 511}, 67 { 48000000, AU6601_CLK_48_MHZ, 1, 511}, 68 {125000000, AU6601_CLK_125_MHZ, 1, 511}, 69 {384000000, AU6601_CLK_384_MHZ, 1, 511}, 70 }; 71 72 static inline void alcor_rmw8(struct alcor_sdmmc_host *host, unsigned int addr, 73 u8 clear, u8 set) 74 { 75 struct alcor_pci_priv *priv = host->alcor_pci; 76 u32 var; 77 78 var = alcor_read8(priv, addr); 79 var &= ~clear; 80 var |= set; 81 alcor_write8(priv, var, addr); 82 } 83 84 /* As soon as irqs are masked, some status updates may be missed. 85 * Use this with care. 86 */ 87 static inline void alcor_mask_sd_irqs(struct alcor_sdmmc_host *host) 88 { 89 struct alcor_pci_priv *priv = host->alcor_pci; 90 91 alcor_write32(priv, 0, AU6601_REG_INT_ENABLE); 92 } 93 94 static inline void alcor_unmask_sd_irqs(struct alcor_sdmmc_host *host) 95 { 96 struct alcor_pci_priv *priv = host->alcor_pci; 97 98 alcor_write32(priv, AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK | 99 AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE | 100 AU6601_INT_OVER_CURRENT_ERR, 101 AU6601_REG_INT_ENABLE); 102 } 103 104 static void alcor_reset(struct alcor_sdmmc_host *host, u8 val) 105 { 106 struct alcor_pci_priv *priv = host->alcor_pci; 107 int i; 108 109 alcor_write8(priv, val | AU6601_BUF_CTRL_RESET, 110 AU6601_REG_SW_RESET); 111 for (i = 0; i < 100; i++) { 112 if (!(alcor_read8(priv, AU6601_REG_SW_RESET) & val)) 113 return; 114 udelay(50); 115 } 116 dev_err(host->dev, "%s: timeout\n", __func__); 117 } 118 119 /* 120 * Perform DMA I/O of a single page. 121 */ 122 static void alcor_data_set_dma(struct alcor_sdmmc_host *host) 123 { 124 struct alcor_pci_priv *priv = host->alcor_pci; 125 u32 addr; 126 127 if (!host->sg_count) 128 return; 129 130 if (!host->sg) { 131 dev_err(host->dev, "have blocks, but no SG\n"); 132 return; 133 } 134 135 if (!sg_dma_len(host->sg)) { 136 dev_err(host->dev, "DMA SG len == 0\n"); 137 return; 138 } 139 140 141 addr = (u32)sg_dma_address(host->sg); 142 143 alcor_write32(priv, addr, AU6601_REG_SDMA_ADDR); 144 host->sg = sg_next(host->sg); 145 host->sg_count--; 146 } 147 148 static void alcor_trigger_data_transfer(struct alcor_sdmmc_host *host) 149 { 150 struct alcor_pci_priv *priv = host->alcor_pci; 151 struct mmc_data *data = host->data; 152 u8 ctrl = 0; 153 154 if (data->flags & MMC_DATA_WRITE) 155 ctrl |= AU6601_DATA_WRITE; 156 157 if (data->host_cookie == COOKIE_MAPPED) { 158 /* 159 * For DMA transfers, this function is called just once, 160 * at the start of the operation. The hardware can only 161 * perform DMA I/O on a single page at a time, so here 162 * we kick off the transfer with the first page, and expect 163 * subsequent pages to be transferred upon IRQ events 164 * indicating that the single-page DMA was completed. 165 */ 166 alcor_data_set_dma(host); 167 ctrl |= AU6601_DATA_DMA_MODE; 168 host->dma_on = 1; 169 alcor_write32(priv, data->sg_count * 0x1000, 170 AU6601_REG_BLOCK_SIZE); 171 } else { 172 /* 173 * For PIO transfers, we break down each operation 174 * into several sector-sized transfers. When one sector has 175 * complete, the IRQ handler will call this function again 176 * to kick off the transfer of the next sector. 177 */ 178 alcor_write32(priv, data->blksz, AU6601_REG_BLOCK_SIZE); 179 } 180 181 alcor_write8(priv, ctrl | AU6601_DATA_START_XFER, 182 AU6601_DATA_XFER_CTRL); 183 } 184 185 static void alcor_trf_block_pio(struct alcor_sdmmc_host *host, bool read) 186 { 187 struct alcor_pci_priv *priv = host->alcor_pci; 188 size_t blksize, len; 189 u8 *buf; 190 191 if (!host->blocks) 192 return; 193 194 if (host->dma_on) { 195 dev_err(host->dev, "configured DMA but got PIO request.\n"); 196 return; 197 } 198 199 if (!!(host->data->flags & MMC_DATA_READ) != read) { 200 dev_err(host->dev, "got unexpected direction %i != %i\n", 201 !!(host->data->flags & MMC_DATA_READ), read); 202 } 203 204 if (!sg_miter_next(&host->sg_miter)) 205 return; 206 207 blksize = host->data->blksz; 208 len = min(host->sg_miter.length, blksize); 209 210 dev_dbg(host->dev, "PIO, %s block size: 0x%zx\n", 211 read ? "read" : "write", blksize); 212 213 host->sg_miter.consumed = len; 214 host->blocks--; 215 216 buf = host->sg_miter.addr; 217 218 if (read) 219 ioread32_rep(priv->iobase + AU6601_REG_BUFFER, buf, len >> 2); 220 else 221 iowrite32_rep(priv->iobase + AU6601_REG_BUFFER, buf, len >> 2); 222 223 sg_miter_stop(&host->sg_miter); 224 } 225 226 static void alcor_prepare_sg_miter(struct alcor_sdmmc_host *host) 227 { 228 unsigned int flags = SG_MITER_ATOMIC; 229 struct mmc_data *data = host->data; 230 231 if (data->flags & MMC_DATA_READ) 232 flags |= SG_MITER_TO_SG; 233 else 234 flags |= SG_MITER_FROM_SG; 235 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 236 } 237 238 static void alcor_prepare_data(struct alcor_sdmmc_host *host, 239 struct mmc_command *cmd) 240 { 241 struct alcor_pci_priv *priv = host->alcor_pci; 242 struct mmc_data *data = cmd->data; 243 244 if (!data) 245 return; 246 247 248 host->data = data; 249 host->data->bytes_xfered = 0; 250 host->blocks = data->blocks; 251 host->sg = data->sg; 252 host->sg_count = data->sg_count; 253 dev_dbg(host->dev, "prepare DATA: sg %i, blocks: %i\n", 254 host->sg_count, host->blocks); 255 256 if (data->host_cookie != COOKIE_MAPPED) 257 alcor_prepare_sg_miter(host); 258 259 alcor_write8(priv, 0, AU6601_DATA_XFER_CTRL); 260 } 261 262 static void alcor_send_cmd(struct alcor_sdmmc_host *host, 263 struct mmc_command *cmd, bool set_timeout) 264 { 265 struct alcor_pci_priv *priv = host->alcor_pci; 266 unsigned long timeout = 0; 267 u8 ctrl = 0; 268 269 host->cmd = cmd; 270 alcor_prepare_data(host, cmd); 271 272 dev_dbg(host->dev, "send CMD. opcode: 0x%02x, arg; 0x%08x\n", 273 cmd->opcode, cmd->arg); 274 alcor_write8(priv, cmd->opcode | 0x40, AU6601_REG_CMD_OPCODE); 275 alcor_write32be(priv, cmd->arg, AU6601_REG_CMD_ARG); 276 277 switch (mmc_resp_type(cmd)) { 278 case MMC_RSP_NONE: 279 ctrl = AU6601_CMD_NO_RESP; 280 break; 281 case MMC_RSP_R1: 282 ctrl = AU6601_CMD_6_BYTE_CRC; 283 break; 284 case MMC_RSP_R1B: 285 ctrl = AU6601_CMD_6_BYTE_CRC | AU6601_CMD_STOP_WAIT_RDY; 286 break; 287 case MMC_RSP_R2: 288 ctrl = AU6601_CMD_17_BYTE_CRC; 289 break; 290 case MMC_RSP_R3: 291 ctrl = AU6601_CMD_6_BYTE_WO_CRC; 292 break; 293 default: 294 dev_err(host->dev, "%s: cmd->flag (0x%02x) is not valid\n", 295 mmc_hostname(mmc_from_priv(host)), mmc_resp_type(cmd)); 296 break; 297 } 298 299 if (set_timeout) { 300 if (!cmd->data && cmd->busy_timeout) 301 timeout = cmd->busy_timeout; 302 else 303 timeout = 10000; 304 305 schedule_delayed_work(&host->timeout_work, 306 msecs_to_jiffies(timeout)); 307 } 308 309 dev_dbg(host->dev, "xfer ctrl: 0x%02x; timeout: %lu\n", ctrl, timeout); 310 alcor_write8(priv, ctrl | AU6601_CMD_START_XFER, 311 AU6601_CMD_XFER_CTRL); 312 } 313 314 static void alcor_request_complete(struct alcor_sdmmc_host *host, 315 bool cancel_timeout) 316 { 317 struct mmc_request *mrq; 318 319 /* 320 * If this work gets rescheduled while running, it will 321 * be run again afterwards but without any active request. 322 */ 323 if (!host->mrq) 324 return; 325 326 if (cancel_timeout) 327 cancel_delayed_work(&host->timeout_work); 328 329 mrq = host->mrq; 330 331 host->mrq = NULL; 332 host->cmd = NULL; 333 host->data = NULL; 334 host->dma_on = 0; 335 336 mmc_request_done(mmc_from_priv(host), mrq); 337 } 338 339 static void alcor_finish_data(struct alcor_sdmmc_host *host) 340 { 341 struct mmc_data *data; 342 343 data = host->data; 344 host->data = NULL; 345 host->dma_on = 0; 346 347 /* 348 * The specification states that the block count register must 349 * be updated, but it does not specify at what point in the 350 * data flow. That makes the register entirely useless to read 351 * back so we have to assume that nothing made it to the card 352 * in the event of an error. 353 */ 354 if (data->error) 355 data->bytes_xfered = 0; 356 else 357 data->bytes_xfered = data->blksz * data->blocks; 358 359 /* 360 * Need to send CMD12 if - 361 * a) open-ended multiblock transfer (no CMD23) 362 * b) error in multiblock transfer 363 */ 364 if (data->stop && 365 (data->error || 366 !host->mrq->sbc)) { 367 368 /* 369 * The controller needs a reset of internal state machines 370 * upon error conditions. 371 */ 372 if (data->error) 373 alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA); 374 375 alcor_unmask_sd_irqs(host); 376 alcor_send_cmd(host, data->stop, false); 377 return; 378 } 379 380 alcor_request_complete(host, 1); 381 } 382 383 static void alcor_err_irq(struct alcor_sdmmc_host *host, u32 intmask) 384 { 385 dev_dbg(host->dev, "ERR IRQ %x\n", intmask); 386 387 if (host->cmd) { 388 if (intmask & AU6601_INT_CMD_TIMEOUT_ERR) 389 host->cmd->error = -ETIMEDOUT; 390 else 391 host->cmd->error = -EILSEQ; 392 } 393 394 if (host->data) { 395 if (intmask & AU6601_INT_DATA_TIMEOUT_ERR) 396 host->data->error = -ETIMEDOUT; 397 else 398 host->data->error = -EILSEQ; 399 400 host->data->bytes_xfered = 0; 401 } 402 403 alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA); 404 alcor_request_complete(host, 1); 405 } 406 407 static int alcor_cmd_irq_done(struct alcor_sdmmc_host *host, u32 intmask) 408 { 409 struct alcor_pci_priv *priv = host->alcor_pci; 410 411 intmask &= AU6601_INT_CMD_END; 412 413 if (!intmask) 414 return true; 415 416 /* got CMD_END but no CMD is in progress, wake thread an process the 417 * error 418 */ 419 if (!host->cmd) 420 return false; 421 422 if (host->cmd->flags & MMC_RSP_PRESENT) { 423 struct mmc_command *cmd = host->cmd; 424 425 cmd->resp[0] = alcor_read32be(priv, AU6601_REG_CMD_RSP0); 426 dev_dbg(host->dev, "RSP0: 0x%04x\n", cmd->resp[0]); 427 if (host->cmd->flags & MMC_RSP_136) { 428 cmd->resp[1] = 429 alcor_read32be(priv, AU6601_REG_CMD_RSP1); 430 cmd->resp[2] = 431 alcor_read32be(priv, AU6601_REG_CMD_RSP2); 432 cmd->resp[3] = 433 alcor_read32be(priv, AU6601_REG_CMD_RSP3); 434 dev_dbg(host->dev, "RSP1,2,3: 0x%04x 0x%04x 0x%04x\n", 435 cmd->resp[1], cmd->resp[2], cmd->resp[3]); 436 } 437 438 } 439 440 host->cmd->error = 0; 441 442 /* Processed actual command. */ 443 if (!host->data) 444 return false; 445 446 alcor_trigger_data_transfer(host); 447 host->cmd = NULL; 448 return true; 449 } 450 451 static void alcor_cmd_irq_thread(struct alcor_sdmmc_host *host, u32 intmask) 452 { 453 intmask &= AU6601_INT_CMD_END; 454 455 if (!intmask) 456 return; 457 458 if (!host->cmd && intmask & AU6601_INT_CMD_END) { 459 dev_dbg(host->dev, "Got command interrupt 0x%08x even though no command operation was in progress.\n", 460 intmask); 461 } 462 463 /* Processed actual command. */ 464 if (!host->data) 465 alcor_request_complete(host, 1); 466 else 467 alcor_trigger_data_transfer(host); 468 host->cmd = NULL; 469 } 470 471 static int alcor_data_irq_done(struct alcor_sdmmc_host *host, u32 intmask) 472 { 473 u32 tmp; 474 475 intmask &= AU6601_INT_DATA_MASK; 476 477 /* nothing here to do */ 478 if (!intmask) 479 return 1; 480 481 /* we was too fast and got DATA_END after it was processed? 482 * lets ignore it for now. 483 */ 484 if (!host->data && intmask == AU6601_INT_DATA_END) 485 return 1; 486 487 /* looks like an error, so lets handle it. */ 488 if (!host->data) 489 return 0; 490 491 tmp = intmask & (AU6601_INT_READ_BUF_RDY | AU6601_INT_WRITE_BUF_RDY 492 | AU6601_INT_DMA_END); 493 switch (tmp) { 494 case 0: 495 break; 496 case AU6601_INT_READ_BUF_RDY: 497 alcor_trf_block_pio(host, true); 498 return 1; 499 case AU6601_INT_WRITE_BUF_RDY: 500 alcor_trf_block_pio(host, false); 501 return 1; 502 case AU6601_INT_DMA_END: 503 if (!host->sg_count) 504 break; 505 506 alcor_data_set_dma(host); 507 break; 508 default: 509 dev_err(host->dev, "Got READ_BUF_RDY and WRITE_BUF_RDY at same time\n"); 510 break; 511 } 512 513 if (intmask & AU6601_INT_DATA_END) { 514 if (!host->dma_on && host->blocks) { 515 alcor_trigger_data_transfer(host); 516 return 1; 517 } else { 518 return 0; 519 } 520 } 521 522 return 1; 523 } 524 525 static void alcor_data_irq_thread(struct alcor_sdmmc_host *host, u32 intmask) 526 { 527 intmask &= AU6601_INT_DATA_MASK; 528 529 if (!intmask) 530 return; 531 532 if (!host->data) { 533 dev_dbg(host->dev, "Got data interrupt 0x%08x even though no data operation was in progress.\n", 534 intmask); 535 alcor_reset(host, AU6601_RESET_DATA); 536 return; 537 } 538 539 if (alcor_data_irq_done(host, intmask)) 540 return; 541 542 if ((intmask & AU6601_INT_DATA_END) || !host->blocks || 543 (host->dma_on && !host->sg_count)) 544 alcor_finish_data(host); 545 } 546 547 static void alcor_cd_irq(struct alcor_sdmmc_host *host, u32 intmask) 548 { 549 dev_dbg(host->dev, "card %s\n", 550 intmask & AU6601_INT_CARD_REMOVE ? "removed" : "inserted"); 551 552 if (host->mrq) { 553 dev_dbg(host->dev, "cancel all pending tasks.\n"); 554 555 if (host->data) 556 host->data->error = -ENOMEDIUM; 557 558 if (host->cmd) 559 host->cmd->error = -ENOMEDIUM; 560 else 561 host->mrq->cmd->error = -ENOMEDIUM; 562 563 alcor_request_complete(host, 1); 564 } 565 566 mmc_detect_change(mmc_from_priv(host), msecs_to_jiffies(1)); 567 } 568 569 static irqreturn_t alcor_irq_thread(int irq, void *d) 570 { 571 struct alcor_sdmmc_host *host = d; 572 irqreturn_t ret = IRQ_HANDLED; 573 u32 intmask, tmp; 574 575 mutex_lock(&host->cmd_mutex); 576 577 intmask = host->irq_status_sd; 578 579 /* some thing bad */ 580 if (unlikely(!intmask || AU6601_INT_ALL_MASK == intmask)) { 581 dev_dbg(host->dev, "unexpected IRQ: 0x%04x\n", intmask); 582 ret = IRQ_NONE; 583 goto exit; 584 } 585 586 tmp = intmask & (AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK); 587 if (tmp) { 588 if (tmp & AU6601_INT_ERROR_MASK) 589 alcor_err_irq(host, tmp); 590 else { 591 alcor_cmd_irq_thread(host, tmp); 592 alcor_data_irq_thread(host, tmp); 593 } 594 intmask &= ~(AU6601_INT_CMD_MASK | AU6601_INT_DATA_MASK); 595 } 596 597 if (intmask & (AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE)) { 598 alcor_cd_irq(host, intmask); 599 intmask &= ~(AU6601_INT_CARD_INSERT | AU6601_INT_CARD_REMOVE); 600 } 601 602 if (intmask & AU6601_INT_OVER_CURRENT_ERR) { 603 dev_warn(host->dev, 604 "warning: over current detected!\n"); 605 intmask &= ~AU6601_INT_OVER_CURRENT_ERR; 606 } 607 608 if (intmask) 609 dev_dbg(host->dev, "got not handled IRQ: 0x%04x\n", intmask); 610 611 exit: 612 mutex_unlock(&host->cmd_mutex); 613 alcor_unmask_sd_irqs(host); 614 return ret; 615 } 616 617 618 static irqreturn_t alcor_irq(int irq, void *d) 619 { 620 struct alcor_sdmmc_host *host = d; 621 struct alcor_pci_priv *priv = host->alcor_pci; 622 u32 status, tmp; 623 irqreturn_t ret; 624 int cmd_done, data_done; 625 626 status = alcor_read32(priv, AU6601_REG_INT_STATUS); 627 if (!status) 628 return IRQ_NONE; 629 630 alcor_write32(priv, status, AU6601_REG_INT_STATUS); 631 632 tmp = status & (AU6601_INT_READ_BUF_RDY | AU6601_INT_WRITE_BUF_RDY 633 | AU6601_INT_DATA_END | AU6601_INT_DMA_END 634 | AU6601_INT_CMD_END); 635 if (tmp == status) { 636 cmd_done = alcor_cmd_irq_done(host, tmp); 637 data_done = alcor_data_irq_done(host, tmp); 638 /* use fast path for simple tasks */ 639 if (cmd_done && data_done) { 640 ret = IRQ_HANDLED; 641 goto alcor_irq_done; 642 } 643 } 644 645 host->irq_status_sd = status; 646 ret = IRQ_WAKE_THREAD; 647 alcor_mask_sd_irqs(host); 648 alcor_irq_done: 649 return ret; 650 } 651 652 static void alcor_set_clock(struct alcor_sdmmc_host *host, unsigned int clock) 653 { 654 struct alcor_pci_priv *priv = host->alcor_pci; 655 int i, diff = 0x7fffffff, tmp_clock = 0; 656 u16 clk_src = 0; 657 u8 clk_div = 0; 658 659 if (clock == 0) { 660 alcor_write16(priv, 0, AU6601_CLK_SELECT); 661 return; 662 } 663 664 for (i = 0; i < ARRAY_SIZE(alcor_pll_cfg); i++) { 665 unsigned int tmp_div, tmp_diff; 666 const struct alcor_pll_conf *cfg = &alcor_pll_cfg[i]; 667 668 tmp_div = DIV_ROUND_UP(cfg->clk_src_freq, clock); 669 if (cfg->min_div > tmp_div || tmp_div > cfg->max_div) 670 continue; 671 672 tmp_clock = DIV_ROUND_UP(cfg->clk_src_freq, tmp_div); 673 tmp_diff = abs(clock - tmp_clock); 674 675 if (tmp_diff < diff) { 676 diff = tmp_diff; 677 clk_src = cfg->clk_src_reg; 678 clk_div = tmp_div; 679 } 680 } 681 682 clk_src |= ((clk_div - 1) << 8); 683 clk_src |= AU6601_CLK_ENABLE; 684 685 dev_dbg(host->dev, "set freq %d cal freq %d, use div %d, mod %x\n", 686 clock, tmp_clock, clk_div, clk_src); 687 688 alcor_write16(priv, clk_src, AU6601_CLK_SELECT); 689 690 } 691 692 static void alcor_set_timing(struct mmc_host *mmc, struct mmc_ios *ios) 693 { 694 struct alcor_sdmmc_host *host = mmc_priv(mmc); 695 696 if (ios->timing == MMC_TIMING_LEGACY) { 697 alcor_rmw8(host, AU6601_CLK_DELAY, 698 AU6601_CLK_POSITIVE_EDGE_ALL, 0); 699 } else { 700 alcor_rmw8(host, AU6601_CLK_DELAY, 701 0, AU6601_CLK_POSITIVE_EDGE_ALL); 702 } 703 } 704 705 static void alcor_set_bus_width(struct mmc_host *mmc, struct mmc_ios *ios) 706 { 707 struct alcor_sdmmc_host *host = mmc_priv(mmc); 708 struct alcor_pci_priv *priv = host->alcor_pci; 709 710 if (ios->bus_width == MMC_BUS_WIDTH_1) { 711 alcor_write8(priv, 0, AU6601_REG_BUS_CTRL); 712 } else if (ios->bus_width == MMC_BUS_WIDTH_4) { 713 alcor_write8(priv, AU6601_BUS_WIDTH_4BIT, 714 AU6601_REG_BUS_CTRL); 715 } else 716 dev_err(host->dev, "Unknown BUS mode\n"); 717 718 } 719 720 static int alcor_card_busy(struct mmc_host *mmc) 721 { 722 struct alcor_sdmmc_host *host = mmc_priv(mmc); 723 struct alcor_pci_priv *priv = host->alcor_pci; 724 u8 status; 725 726 /* Check whether dat[0:3] low */ 727 status = alcor_read8(priv, AU6601_DATA_PIN_STATE); 728 729 return !(status & AU6601_BUS_STAT_DAT_MASK); 730 } 731 732 static int alcor_get_cd(struct mmc_host *mmc) 733 { 734 struct alcor_sdmmc_host *host = mmc_priv(mmc); 735 struct alcor_pci_priv *priv = host->alcor_pci; 736 u8 detect; 737 738 detect = alcor_read8(priv, AU6601_DETECT_STATUS) 739 & AU6601_DETECT_STATUS_M; 740 /* check if card is present then send command and data */ 741 return (detect == AU6601_SD_DETECTED); 742 } 743 744 static int alcor_get_ro(struct mmc_host *mmc) 745 { 746 struct alcor_sdmmc_host *host = mmc_priv(mmc); 747 struct alcor_pci_priv *priv = host->alcor_pci; 748 u8 status; 749 750 /* get write protect pin status */ 751 status = alcor_read8(priv, AU6601_INTERFACE_MODE_CTRL); 752 753 return !!(status & AU6601_SD_CARD_WP); 754 } 755 756 static void alcor_request(struct mmc_host *mmc, struct mmc_request *mrq) 757 { 758 struct alcor_sdmmc_host *host = mmc_priv(mmc); 759 760 mutex_lock(&host->cmd_mutex); 761 762 host->mrq = mrq; 763 764 /* check if card is present then send command and data */ 765 if (alcor_get_cd(mmc)) 766 alcor_send_cmd(host, mrq->cmd, true); 767 else { 768 mrq->cmd->error = -ENOMEDIUM; 769 alcor_request_complete(host, 1); 770 } 771 772 mutex_unlock(&host->cmd_mutex); 773 } 774 775 static void alcor_pre_req(struct mmc_host *mmc, 776 struct mmc_request *mrq) 777 { 778 struct alcor_sdmmc_host *host = mmc_priv(mmc); 779 struct mmc_data *data = mrq->data; 780 struct mmc_command *cmd = mrq->cmd; 781 struct scatterlist *sg; 782 unsigned int i, sg_len; 783 784 if (!data || !cmd) 785 return; 786 787 data->host_cookie = COOKIE_UNMAPPED; 788 789 /* FIXME: looks like the DMA engine works only with CMD18 */ 790 if (cmd->opcode != MMC_READ_MULTIPLE_BLOCK 791 && cmd->opcode != MMC_WRITE_MULTIPLE_BLOCK) 792 return; 793 /* 794 * We don't do DMA on "complex" transfers, i.e. with 795 * non-word-aligned buffers or lengths. A future improvement 796 * could be made to use temporary DMA bounce-buffers when these 797 * requirements are not met. 798 * 799 * Also, we don't bother with all the DMA setup overhead for 800 * short transfers. 801 */ 802 if (data->blocks * data->blksz < AU6601_MAX_DMA_BLOCK_SIZE) 803 return; 804 805 if (data->blksz & 3) 806 return; 807 808 for_each_sg(data->sg, sg, data->sg_len, i) { 809 if (sg->length != AU6601_MAX_DMA_BLOCK_SIZE) 810 return; 811 if (sg->offset != 0) 812 return; 813 } 814 815 /* This data might be unmapped at this time */ 816 817 sg_len = dma_map_sg(host->dev, data->sg, data->sg_len, 818 mmc_get_dma_dir(data)); 819 if (sg_len) 820 data->host_cookie = COOKIE_MAPPED; 821 822 data->sg_count = sg_len; 823 } 824 825 static void alcor_post_req(struct mmc_host *mmc, 826 struct mmc_request *mrq, 827 int err) 828 { 829 struct alcor_sdmmc_host *host = mmc_priv(mmc); 830 struct mmc_data *data = mrq->data; 831 832 if (!data) 833 return; 834 835 if (data->host_cookie == COOKIE_MAPPED) { 836 dma_unmap_sg(host->dev, 837 data->sg, 838 data->sg_len, 839 mmc_get_dma_dir(data)); 840 } 841 842 data->host_cookie = COOKIE_UNMAPPED; 843 } 844 845 static void alcor_set_power_mode(struct mmc_host *mmc, struct mmc_ios *ios) 846 { 847 struct alcor_sdmmc_host *host = mmc_priv(mmc); 848 struct alcor_pci_priv *priv = host->alcor_pci; 849 850 switch (ios->power_mode) { 851 case MMC_POWER_OFF: 852 alcor_set_clock(host, ios->clock); 853 /* set all pins to input */ 854 alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE); 855 /* turn of VDD */ 856 alcor_write8(priv, 0, AU6601_POWER_CONTROL); 857 break; 858 case MMC_POWER_UP: 859 break; 860 case MMC_POWER_ON: 861 /* This is most trickiest part. The order and timings of 862 * instructions seems to play important role. Any changes may 863 * confuse internal state engine if this HW. 864 * FIXME: If we will ever get access to documentation, then this 865 * part should be reviewed again. 866 */ 867 868 /* enable SD card mode */ 869 alcor_write8(priv, AU6601_SD_CARD, 870 AU6601_ACTIVE_CTRL); 871 /* set signal voltage to 3.3V */ 872 alcor_write8(priv, 0, AU6601_OPT); 873 /* no documentation about clk delay, for now just try to mimic 874 * original driver. 875 */ 876 alcor_write8(priv, 0x20, AU6601_CLK_DELAY); 877 /* set BUS width to 1 bit */ 878 alcor_write8(priv, 0, AU6601_REG_BUS_CTRL); 879 /* set CLK first time */ 880 alcor_set_clock(host, ios->clock); 881 /* power on VDD */ 882 alcor_write8(priv, AU6601_SD_CARD, 883 AU6601_POWER_CONTROL); 884 /* wait until the CLK will get stable */ 885 mdelay(20); 886 /* set CLK again, mimic original driver. */ 887 alcor_set_clock(host, ios->clock); 888 889 /* enable output */ 890 alcor_write8(priv, AU6601_SD_CARD, 891 AU6601_OUTPUT_ENABLE); 892 /* The clk will not work on au6621. We need to trigger data 893 * transfer. 894 */ 895 alcor_write8(priv, AU6601_DATA_WRITE, 896 AU6601_DATA_XFER_CTRL); 897 /* configure timeout. Not clear what exactly it means. */ 898 alcor_write8(priv, 0x7d, AU6601_TIME_OUT_CTRL); 899 mdelay(100); 900 break; 901 default: 902 dev_err(host->dev, "Unknown power parameter\n"); 903 } 904 } 905 906 static void alcor_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 907 { 908 struct alcor_sdmmc_host *host = mmc_priv(mmc); 909 910 mutex_lock(&host->cmd_mutex); 911 912 dev_dbg(host->dev, "set ios. bus width: %x, power mode: %x\n", 913 ios->bus_width, ios->power_mode); 914 915 if (ios->power_mode != host->cur_power_mode) { 916 alcor_set_power_mode(mmc, ios); 917 host->cur_power_mode = ios->power_mode; 918 } else { 919 alcor_set_timing(mmc, ios); 920 alcor_set_bus_width(mmc, ios); 921 alcor_set_clock(host, ios->clock); 922 } 923 924 mutex_unlock(&host->cmd_mutex); 925 } 926 927 static int alcor_signal_voltage_switch(struct mmc_host *mmc, 928 struct mmc_ios *ios) 929 { 930 struct alcor_sdmmc_host *host = mmc_priv(mmc); 931 932 mutex_lock(&host->cmd_mutex); 933 934 switch (ios->signal_voltage) { 935 case MMC_SIGNAL_VOLTAGE_330: 936 alcor_rmw8(host, AU6601_OPT, AU6601_OPT_SD_18V, 0); 937 break; 938 case MMC_SIGNAL_VOLTAGE_180: 939 alcor_rmw8(host, AU6601_OPT, 0, AU6601_OPT_SD_18V); 940 break; 941 default: 942 /* No signal voltage switch required */ 943 break; 944 } 945 946 mutex_unlock(&host->cmd_mutex); 947 return 0; 948 } 949 950 static const struct mmc_host_ops alcor_sdc_ops = { 951 .card_busy = alcor_card_busy, 952 .get_cd = alcor_get_cd, 953 .get_ro = alcor_get_ro, 954 .post_req = alcor_post_req, 955 .pre_req = alcor_pre_req, 956 .request = alcor_request, 957 .set_ios = alcor_set_ios, 958 .start_signal_voltage_switch = alcor_signal_voltage_switch, 959 }; 960 961 static void alcor_timeout_timer(struct work_struct *work) 962 { 963 struct delayed_work *d = to_delayed_work(work); 964 struct alcor_sdmmc_host *host = container_of(d, struct alcor_sdmmc_host, 965 timeout_work); 966 mutex_lock(&host->cmd_mutex); 967 968 dev_dbg(host->dev, "triggered timeout\n"); 969 if (host->mrq) { 970 dev_err(host->dev, "Timeout waiting for hardware interrupt.\n"); 971 972 if (host->data) { 973 host->data->error = -ETIMEDOUT; 974 } else { 975 if (host->cmd) 976 host->cmd->error = -ETIMEDOUT; 977 else 978 host->mrq->cmd->error = -ETIMEDOUT; 979 } 980 981 alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA); 982 alcor_request_complete(host, 0); 983 } 984 985 mutex_unlock(&host->cmd_mutex); 986 } 987 988 static void alcor_hw_init(struct alcor_sdmmc_host *host) 989 { 990 struct alcor_pci_priv *priv = host->alcor_pci; 991 struct alcor_dev_cfg *cfg = priv->cfg; 992 993 /* FIXME: This part is a mimics HW init of original driver. 994 * If we will ever get access to documentation, then this part 995 * should be reviewed again. 996 */ 997 998 /* reset command state engine */ 999 alcor_reset(host, AU6601_RESET_CMD); 1000 1001 alcor_write8(priv, 0, AU6601_DMA_BOUNDARY); 1002 /* enable sd card mode */ 1003 alcor_write8(priv, AU6601_SD_CARD, AU6601_ACTIVE_CTRL); 1004 1005 /* set BUS width to 1 bit */ 1006 alcor_write8(priv, 0, AU6601_REG_BUS_CTRL); 1007 1008 /* reset data state engine */ 1009 alcor_reset(host, AU6601_RESET_DATA); 1010 /* Not sure if a voodoo with AU6601_DMA_BOUNDARY is really needed */ 1011 alcor_write8(priv, 0, AU6601_DMA_BOUNDARY); 1012 1013 alcor_write8(priv, 0, AU6601_INTERFACE_MODE_CTRL); 1014 /* not clear what we are doing here. */ 1015 alcor_write8(priv, 0x44, AU6601_PAD_DRIVE0); 1016 alcor_write8(priv, 0x44, AU6601_PAD_DRIVE1); 1017 alcor_write8(priv, 0x00, AU6601_PAD_DRIVE2); 1018 1019 /* for 6601 - dma_boundary; for 6621 - dma_page_cnt 1020 * exact meaning of this register is not clear. 1021 */ 1022 alcor_write8(priv, cfg->dma, AU6601_DMA_BOUNDARY); 1023 1024 /* make sure all pins are set to input and VDD is off */ 1025 alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE); 1026 alcor_write8(priv, 0, AU6601_POWER_CONTROL); 1027 1028 alcor_write8(priv, AU6601_DETECT_EN, AU6601_DETECT_STATUS); 1029 /* now we should be safe to enable IRQs */ 1030 alcor_unmask_sd_irqs(host); 1031 } 1032 1033 static void alcor_hw_uninit(struct alcor_sdmmc_host *host) 1034 { 1035 struct alcor_pci_priv *priv = host->alcor_pci; 1036 1037 alcor_mask_sd_irqs(host); 1038 alcor_reset(host, AU6601_RESET_CMD | AU6601_RESET_DATA); 1039 1040 alcor_write8(priv, 0, AU6601_DETECT_STATUS); 1041 1042 alcor_write8(priv, 0, AU6601_OUTPUT_ENABLE); 1043 alcor_write8(priv, 0, AU6601_POWER_CONTROL); 1044 1045 alcor_write8(priv, 0, AU6601_OPT); 1046 } 1047 1048 static void alcor_init_mmc(struct alcor_sdmmc_host *host) 1049 { 1050 struct mmc_host *mmc = mmc_from_priv(host); 1051 1052 mmc->f_min = AU6601_MIN_CLOCK; 1053 mmc->f_max = AU6601_MAX_CLOCK; 1054 mmc->ocr_avail = MMC_VDD_33_34; 1055 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED 1056 | MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 1057 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50; 1058 mmc->caps2 = MMC_CAP2_NO_SDIO; 1059 mmc->ops = &alcor_sdc_ops; 1060 1061 /* The hardware does DMA data transfer of 4096 bytes to/from a single 1062 * buffer address. Scatterlists are not supported at the hardware 1063 * level, however we can work with them at the driver level, 1064 * provided that each segment is exactly 4096 bytes in size. 1065 * Upon DMA completion of a single segment (signalled via IRQ), we 1066 * immediately proceed to transfer the next segment from the 1067 * scatterlist. 1068 * 1069 * The overall request is limited to 240 sectors, matching the 1070 * original vendor driver. 1071 */ 1072 mmc->max_segs = AU6601_MAX_DMA_SEGMENTS; 1073 mmc->max_seg_size = AU6601_MAX_DMA_BLOCK_SIZE; 1074 mmc->max_blk_count = 240; 1075 mmc->max_req_size = mmc->max_blk_count * mmc->max_blk_size; 1076 dma_set_max_seg_size(host->dev, mmc->max_seg_size); 1077 } 1078 1079 static int alcor_pci_sdmmc_drv_probe(struct platform_device *pdev) 1080 { 1081 struct alcor_pci_priv *priv = pdev->dev.platform_data; 1082 struct mmc_host *mmc; 1083 struct alcor_sdmmc_host *host; 1084 int ret; 1085 1086 mmc = mmc_alloc_host(sizeof(*host), &pdev->dev); 1087 if (!mmc) { 1088 dev_err(&pdev->dev, "Can't allocate MMC\n"); 1089 return -ENOMEM; 1090 } 1091 1092 host = mmc_priv(mmc); 1093 host->dev = &pdev->dev; 1094 host->cur_power_mode = MMC_POWER_UNDEFINED; 1095 host->alcor_pci = priv; 1096 1097 /* make sure irqs are disabled */ 1098 alcor_write32(priv, 0, AU6601_REG_INT_ENABLE); 1099 alcor_write32(priv, 0, AU6601_MS_INT_ENABLE); 1100 1101 ret = devm_request_threaded_irq(&pdev->dev, priv->irq, 1102 alcor_irq, alcor_irq_thread, IRQF_SHARED, 1103 DRV_NAME_ALCOR_PCI_SDMMC, host); 1104 1105 if (ret) { 1106 dev_err(&pdev->dev, "Failed to get irq for data line\n"); 1107 goto free_host; 1108 } 1109 1110 mutex_init(&host->cmd_mutex); 1111 INIT_DELAYED_WORK(&host->timeout_work, alcor_timeout_timer); 1112 1113 alcor_init_mmc(host); 1114 alcor_hw_init(host); 1115 1116 dev_set_drvdata(&pdev->dev, host); 1117 ret = mmc_add_host(mmc); 1118 if (ret) 1119 goto free_host; 1120 1121 return 0; 1122 1123 free_host: 1124 mmc_free_host(mmc); 1125 return ret; 1126 } 1127 1128 static int alcor_pci_sdmmc_drv_remove(struct platform_device *pdev) 1129 { 1130 struct alcor_sdmmc_host *host = dev_get_drvdata(&pdev->dev); 1131 struct mmc_host *mmc = mmc_from_priv(host); 1132 1133 if (cancel_delayed_work_sync(&host->timeout_work)) 1134 alcor_request_complete(host, 0); 1135 1136 alcor_hw_uninit(host); 1137 mmc_remove_host(mmc); 1138 mmc_free_host(mmc); 1139 1140 return 0; 1141 } 1142 1143 #ifdef CONFIG_PM_SLEEP 1144 static int alcor_pci_sdmmc_suspend(struct device *dev) 1145 { 1146 struct alcor_sdmmc_host *host = dev_get_drvdata(dev); 1147 1148 if (cancel_delayed_work_sync(&host->timeout_work)) 1149 alcor_request_complete(host, 0); 1150 1151 alcor_hw_uninit(host); 1152 1153 return 0; 1154 } 1155 1156 static int alcor_pci_sdmmc_resume(struct device *dev) 1157 { 1158 struct alcor_sdmmc_host *host = dev_get_drvdata(dev); 1159 1160 alcor_hw_init(host); 1161 1162 return 0; 1163 } 1164 #endif /* CONFIG_PM_SLEEP */ 1165 1166 static SIMPLE_DEV_PM_OPS(alcor_mmc_pm_ops, alcor_pci_sdmmc_suspend, 1167 alcor_pci_sdmmc_resume); 1168 1169 static const struct platform_device_id alcor_pci_sdmmc_ids[] = { 1170 { 1171 .name = DRV_NAME_ALCOR_PCI_SDMMC, 1172 }, { 1173 /* sentinel */ 1174 } 1175 }; 1176 MODULE_DEVICE_TABLE(platform, alcor_pci_sdmmc_ids); 1177 1178 static struct platform_driver alcor_pci_sdmmc_driver = { 1179 .probe = alcor_pci_sdmmc_drv_probe, 1180 .remove = alcor_pci_sdmmc_drv_remove, 1181 .id_table = alcor_pci_sdmmc_ids, 1182 .driver = { 1183 .name = DRV_NAME_ALCOR_PCI_SDMMC, 1184 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1185 .pm = &alcor_mmc_pm_ops 1186 }, 1187 }; 1188 module_platform_driver(alcor_pci_sdmmc_driver); 1189 1190 MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>"); 1191 MODULE_DESCRIPTION("PCI driver for Alcor Micro AU6601 Secure Digital Host Controller Interface"); 1192 MODULE_LICENSE("GPL"); 1193