1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Synopsys DesignWare Multimedia Card Interface driver 4 * (Based on NXP driver for lpc 31xx) 5 * 6 * Copyright (C) 2009 NXP Semiconductors 7 * Copyright (C) 2009, 2010 Imagination Technologies Ltd. 8 */ 9 10 #include <linux/blkdev.h> 11 #include <linux/clk.h> 12 #include <linux/debugfs.h> 13 #include <linux/device.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/err.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/iopoll.h> 19 #include <linux/ioport.h> 20 #include <linux/ktime.h> 21 #include <linux/module.h> 22 #include <linux/platform_device.h> 23 #include <linux/pm_runtime.h> 24 #include <linux/prandom.h> 25 #include <linux/seq_file.h> 26 #include <linux/slab.h> 27 #include <linux/stat.h> 28 #include <linux/delay.h> 29 #include <linux/irq.h> 30 #include <linux/mmc/card.h> 31 #include <linux/mmc/host.h> 32 #include <linux/mmc/mmc.h> 33 #include <linux/mmc/sd.h> 34 #include <linux/mmc/sdio.h> 35 #include <linux/bitops.h> 36 #include <linux/regulator/consumer.h> 37 #include <linux/of.h> 38 #include <linux/of_gpio.h> 39 #include <linux/mmc/slot-gpio.h> 40 41 #include "dw_mmc.h" 42 43 /* Common flag combinations */ 44 #define DW_MCI_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | \ 45 SDMMC_INT_HTO | SDMMC_INT_SBE | \ 46 SDMMC_INT_EBE | SDMMC_INT_HLE) 47 #define DW_MCI_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | \ 48 SDMMC_INT_RESP_ERR | SDMMC_INT_HLE) 49 #define DW_MCI_ERROR_FLAGS (DW_MCI_DATA_ERROR_FLAGS | \ 50 DW_MCI_CMD_ERROR_FLAGS) 51 #define DW_MCI_SEND_STATUS 1 52 #define DW_MCI_RECV_STATUS 2 53 #define DW_MCI_DMA_THRESHOLD 16 54 55 #define DW_MCI_FREQ_MAX 200000000 /* unit: HZ */ 56 #define DW_MCI_FREQ_MIN 100000 /* unit: HZ */ 57 58 #define IDMAC_INT_CLR (SDMMC_IDMAC_INT_AI | SDMMC_IDMAC_INT_NI | \ 59 SDMMC_IDMAC_INT_CES | SDMMC_IDMAC_INT_DU | \ 60 SDMMC_IDMAC_INT_FBE | SDMMC_IDMAC_INT_RI | \ 61 SDMMC_IDMAC_INT_TI) 62 63 #define DESC_RING_BUF_SZ PAGE_SIZE 64 65 struct idmac_desc_64addr { 66 u32 des0; /* Control Descriptor */ 67 #define IDMAC_OWN_CLR64(x) \ 68 !((x) & cpu_to_le32(IDMAC_DES0_OWN)) 69 70 u32 des1; /* Reserved */ 71 72 u32 des2; /*Buffer sizes */ 73 #define IDMAC_64ADDR_SET_BUFFER1_SIZE(d, s) \ 74 ((d)->des2 = ((d)->des2 & cpu_to_le32(0x03ffe000)) | \ 75 ((cpu_to_le32(s)) & cpu_to_le32(0x1fff))) 76 77 u32 des3; /* Reserved */ 78 79 u32 des4; /* Lower 32-bits of Buffer Address Pointer 1*/ 80 u32 des5; /* Upper 32-bits of Buffer Address Pointer 1*/ 81 82 u32 des6; /* Lower 32-bits of Next Descriptor Address */ 83 u32 des7; /* Upper 32-bits of Next Descriptor Address */ 84 }; 85 86 struct idmac_desc { 87 __le32 des0; /* Control Descriptor */ 88 #define IDMAC_DES0_DIC BIT(1) 89 #define IDMAC_DES0_LD BIT(2) 90 #define IDMAC_DES0_FD BIT(3) 91 #define IDMAC_DES0_CH BIT(4) 92 #define IDMAC_DES0_ER BIT(5) 93 #define IDMAC_DES0_CES BIT(30) 94 #define IDMAC_DES0_OWN BIT(31) 95 96 __le32 des1; /* Buffer sizes */ 97 #define IDMAC_SET_BUFFER1_SIZE(d, s) \ 98 ((d)->des1 = ((d)->des1 & cpu_to_le32(0x03ffe000)) | (cpu_to_le32((s) & 0x1fff))) 99 100 __le32 des2; /* buffer 1 physical address */ 101 102 __le32 des3; /* buffer 2 physical address */ 103 }; 104 105 /* Each descriptor can transfer up to 4KB of data in chained mode */ 106 #define DW_MCI_DESC_DATA_LENGTH 0x1000 107 108 #if defined(CONFIG_DEBUG_FS) 109 static int dw_mci_req_show(struct seq_file *s, void *v) 110 { 111 struct dw_mci_slot *slot = s->private; 112 struct mmc_request *mrq; 113 struct mmc_command *cmd; 114 struct mmc_command *stop; 115 struct mmc_data *data; 116 117 /* Make sure we get a consistent snapshot */ 118 spin_lock_bh(&slot->host->lock); 119 mrq = slot->mrq; 120 121 if (mrq) { 122 cmd = mrq->cmd; 123 data = mrq->data; 124 stop = mrq->stop; 125 126 if (cmd) 127 seq_printf(s, 128 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", 129 cmd->opcode, cmd->arg, cmd->flags, 130 cmd->resp[0], cmd->resp[1], cmd->resp[2], 131 cmd->resp[2], cmd->error); 132 if (data) 133 seq_printf(s, "DATA %u / %u * %u flg %x err %d\n", 134 data->bytes_xfered, data->blocks, 135 data->blksz, data->flags, data->error); 136 if (stop) 137 seq_printf(s, 138 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n", 139 stop->opcode, stop->arg, stop->flags, 140 stop->resp[0], stop->resp[1], stop->resp[2], 141 stop->resp[2], stop->error); 142 } 143 144 spin_unlock_bh(&slot->host->lock); 145 146 return 0; 147 } 148 DEFINE_SHOW_ATTRIBUTE(dw_mci_req); 149 150 static int dw_mci_regs_show(struct seq_file *s, void *v) 151 { 152 struct dw_mci *host = s->private; 153 154 pm_runtime_get_sync(host->dev); 155 156 seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS)); 157 seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS)); 158 seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD)); 159 seq_printf(s, "CTRL:\t0x%08x\n", mci_readl(host, CTRL)); 160 seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK)); 161 seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA)); 162 163 pm_runtime_put_autosuspend(host->dev); 164 165 return 0; 166 } 167 DEFINE_SHOW_ATTRIBUTE(dw_mci_regs); 168 169 static void dw_mci_init_debugfs(struct dw_mci_slot *slot) 170 { 171 struct mmc_host *mmc = slot->mmc; 172 struct dw_mci *host = slot->host; 173 struct dentry *root; 174 175 root = mmc->debugfs_root; 176 if (!root) 177 return; 178 179 debugfs_create_file("regs", S_IRUSR, root, host, &dw_mci_regs_fops); 180 debugfs_create_file("req", S_IRUSR, root, slot, &dw_mci_req_fops); 181 debugfs_create_u32("state", S_IRUSR, root, &host->state); 182 debugfs_create_xul("pending_events", S_IRUSR, root, 183 &host->pending_events); 184 debugfs_create_xul("completed_events", S_IRUSR, root, 185 &host->completed_events); 186 #ifdef CONFIG_FAULT_INJECTION 187 fault_create_debugfs_attr("fail_data_crc", root, &host->fail_data_crc); 188 #endif 189 } 190 #endif /* defined(CONFIG_DEBUG_FS) */ 191 192 static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) 193 { 194 u32 ctrl; 195 196 ctrl = mci_readl(host, CTRL); 197 ctrl |= reset; 198 mci_writel(host, CTRL, ctrl); 199 200 /* wait till resets clear */ 201 if (readl_poll_timeout_atomic(host->regs + SDMMC_CTRL, ctrl, 202 !(ctrl & reset), 203 1, 500 * USEC_PER_MSEC)) { 204 dev_err(host->dev, 205 "Timeout resetting block (ctrl reset %#x)\n", 206 ctrl & reset); 207 return false; 208 } 209 210 return true; 211 } 212 213 static void dw_mci_wait_while_busy(struct dw_mci *host, u32 cmd_flags) 214 { 215 u32 status; 216 217 /* 218 * Databook says that before issuing a new data transfer command 219 * we need to check to see if the card is busy. Data transfer commands 220 * all have SDMMC_CMD_PRV_DAT_WAIT set, so we'll key off that. 221 * 222 * ...also allow sending for SDMMC_CMD_VOLT_SWITCH where busy is 223 * expected. 224 */ 225 if ((cmd_flags & SDMMC_CMD_PRV_DAT_WAIT) && 226 !(cmd_flags & SDMMC_CMD_VOLT_SWITCH)) { 227 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS, 228 status, 229 !(status & SDMMC_STATUS_BUSY), 230 10, 500 * USEC_PER_MSEC)) 231 dev_err(host->dev, "Busy; trying anyway\n"); 232 } 233 } 234 235 static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg) 236 { 237 struct dw_mci *host = slot->host; 238 unsigned int cmd_status = 0; 239 240 mci_writel(host, CMDARG, arg); 241 wmb(); /* drain writebuffer */ 242 dw_mci_wait_while_busy(host, cmd); 243 mci_writel(host, CMD, SDMMC_CMD_START | cmd); 244 245 if (readl_poll_timeout_atomic(host->regs + SDMMC_CMD, cmd_status, 246 !(cmd_status & SDMMC_CMD_START), 247 1, 500 * USEC_PER_MSEC)) 248 dev_err(&slot->mmc->class_dev, 249 "Timeout sending command (cmd %#x arg %#x status %#x)\n", 250 cmd, arg, cmd_status); 251 } 252 253 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd) 254 { 255 struct dw_mci_slot *slot = mmc_priv(mmc); 256 struct dw_mci *host = slot->host; 257 u32 cmdr; 258 259 cmd->error = -EINPROGRESS; 260 cmdr = cmd->opcode; 261 262 if (cmd->opcode == MMC_STOP_TRANSMISSION || 263 cmd->opcode == MMC_GO_IDLE_STATE || 264 cmd->opcode == MMC_GO_INACTIVE_STATE || 265 (cmd->opcode == SD_IO_RW_DIRECT && 266 ((cmd->arg >> 9) & 0x1FFFF) == SDIO_CCCR_ABORT)) 267 cmdr |= SDMMC_CMD_STOP; 268 else if (cmd->opcode != MMC_SEND_STATUS && cmd->data) 269 cmdr |= SDMMC_CMD_PRV_DAT_WAIT; 270 271 if (cmd->opcode == SD_SWITCH_VOLTAGE) { 272 u32 clk_en_a; 273 274 /* Special bit makes CMD11 not die */ 275 cmdr |= SDMMC_CMD_VOLT_SWITCH; 276 277 /* Change state to continue to handle CMD11 weirdness */ 278 WARN_ON(slot->host->state != STATE_SENDING_CMD); 279 slot->host->state = STATE_SENDING_CMD11; 280 281 /* 282 * We need to disable low power mode (automatic clock stop) 283 * while doing voltage switch so we don't confuse the card, 284 * since stopping the clock is a specific part of the UHS 285 * voltage change dance. 286 * 287 * Note that low power mode (SDMMC_CLKEN_LOW_PWR) will be 288 * unconditionally turned back on in dw_mci_setup_bus() if it's 289 * ever called with a non-zero clock. That shouldn't happen 290 * until the voltage change is all done. 291 */ 292 clk_en_a = mci_readl(host, CLKENA); 293 clk_en_a &= ~(SDMMC_CLKEN_LOW_PWR << slot->id); 294 mci_writel(host, CLKENA, clk_en_a); 295 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK | 296 SDMMC_CMD_PRV_DAT_WAIT, 0); 297 } 298 299 if (cmd->flags & MMC_RSP_PRESENT) { 300 /* We expect a response, so set this bit */ 301 cmdr |= SDMMC_CMD_RESP_EXP; 302 if (cmd->flags & MMC_RSP_136) 303 cmdr |= SDMMC_CMD_RESP_LONG; 304 } 305 306 if (cmd->flags & MMC_RSP_CRC) 307 cmdr |= SDMMC_CMD_RESP_CRC; 308 309 if (cmd->data) { 310 cmdr |= SDMMC_CMD_DAT_EXP; 311 if (cmd->data->flags & MMC_DATA_WRITE) 312 cmdr |= SDMMC_CMD_DAT_WR; 313 } 314 315 if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags)) 316 cmdr |= SDMMC_CMD_USE_HOLD_REG; 317 318 return cmdr; 319 } 320 321 static u32 dw_mci_prep_stop_abort(struct dw_mci *host, struct mmc_command *cmd) 322 { 323 struct mmc_command *stop; 324 u32 cmdr; 325 326 if (!cmd->data) 327 return 0; 328 329 stop = &host->stop_abort; 330 cmdr = cmd->opcode; 331 memset(stop, 0, sizeof(struct mmc_command)); 332 333 if (cmdr == MMC_READ_SINGLE_BLOCK || 334 cmdr == MMC_READ_MULTIPLE_BLOCK || 335 cmdr == MMC_WRITE_BLOCK || 336 cmdr == MMC_WRITE_MULTIPLE_BLOCK || 337 cmdr == MMC_SEND_TUNING_BLOCK || 338 cmdr == MMC_SEND_TUNING_BLOCK_HS200 || 339 cmdr == MMC_GEN_CMD) { 340 stop->opcode = MMC_STOP_TRANSMISSION; 341 stop->arg = 0; 342 stop->flags = MMC_RSP_R1B | MMC_CMD_AC; 343 } else if (cmdr == SD_IO_RW_EXTENDED) { 344 stop->opcode = SD_IO_RW_DIRECT; 345 stop->arg |= (1 << 31) | (0 << 28) | (SDIO_CCCR_ABORT << 9) | 346 ((cmd->arg >> 28) & 0x7); 347 stop->flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC; 348 } else { 349 return 0; 350 } 351 352 cmdr = stop->opcode | SDMMC_CMD_STOP | 353 SDMMC_CMD_RESP_CRC | SDMMC_CMD_RESP_EXP; 354 355 if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags)) 356 cmdr |= SDMMC_CMD_USE_HOLD_REG; 357 358 return cmdr; 359 } 360 361 static inline void dw_mci_set_cto(struct dw_mci *host) 362 { 363 unsigned int cto_clks; 364 unsigned int cto_div; 365 unsigned int cto_ms; 366 unsigned long irqflags; 367 368 cto_clks = mci_readl(host, TMOUT) & 0xff; 369 cto_div = (mci_readl(host, CLKDIV) & 0xff) * 2; 370 if (cto_div == 0) 371 cto_div = 1; 372 373 cto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * cto_clks * cto_div, 374 host->bus_hz); 375 376 /* add a bit spare time */ 377 cto_ms += 10; 378 379 /* 380 * The durations we're working with are fairly short so we have to be 381 * extra careful about synchronization here. Specifically in hardware a 382 * command timeout is _at most_ 5.1 ms, so that means we expect an 383 * interrupt (either command done or timeout) to come rather quickly 384 * after the mci_writel. ...but just in case we have a long interrupt 385 * latency let's add a bit of paranoia. 386 * 387 * In general we'll assume that at least an interrupt will be asserted 388 * in hardware by the time the cto_timer runs. ...and if it hasn't 389 * been asserted in hardware by that time then we'll assume it'll never 390 * come. 391 */ 392 spin_lock_irqsave(&host->irq_lock, irqflags); 393 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) 394 mod_timer(&host->cto_timer, 395 jiffies + msecs_to_jiffies(cto_ms) + 1); 396 spin_unlock_irqrestore(&host->irq_lock, irqflags); 397 } 398 399 static void dw_mci_start_command(struct dw_mci *host, 400 struct mmc_command *cmd, u32 cmd_flags) 401 { 402 host->cmd = cmd; 403 dev_vdbg(host->dev, 404 "start command: ARGR=0x%08x CMDR=0x%08x\n", 405 cmd->arg, cmd_flags); 406 407 mci_writel(host, CMDARG, cmd->arg); 408 wmb(); /* drain writebuffer */ 409 dw_mci_wait_while_busy(host, cmd_flags); 410 411 mci_writel(host, CMD, cmd_flags | SDMMC_CMD_START); 412 413 /* response expected command only */ 414 if (cmd_flags & SDMMC_CMD_RESP_EXP) 415 dw_mci_set_cto(host); 416 } 417 418 static inline void send_stop_abort(struct dw_mci *host, struct mmc_data *data) 419 { 420 struct mmc_command *stop = &host->stop_abort; 421 422 dw_mci_start_command(host, stop, host->stop_cmdr); 423 } 424 425 /* DMA interface functions */ 426 static void dw_mci_stop_dma(struct dw_mci *host) 427 { 428 if (host->using_dma) { 429 host->dma_ops->stop(host); 430 host->dma_ops->cleanup(host); 431 } 432 433 /* Data transfer was stopped by the interrupt handler */ 434 set_bit(EVENT_XFER_COMPLETE, &host->pending_events); 435 } 436 437 static void dw_mci_dma_cleanup(struct dw_mci *host) 438 { 439 struct mmc_data *data = host->data; 440 441 if (data && data->host_cookie == COOKIE_MAPPED) { 442 dma_unmap_sg(host->dev, 443 data->sg, 444 data->sg_len, 445 mmc_get_dma_dir(data)); 446 data->host_cookie = COOKIE_UNMAPPED; 447 } 448 } 449 450 static void dw_mci_idmac_reset(struct dw_mci *host) 451 { 452 u32 bmod = mci_readl(host, BMOD); 453 /* Software reset of DMA */ 454 bmod |= SDMMC_IDMAC_SWRESET; 455 mci_writel(host, BMOD, bmod); 456 } 457 458 static void dw_mci_idmac_stop_dma(struct dw_mci *host) 459 { 460 u32 temp; 461 462 /* Disable and reset the IDMAC interface */ 463 temp = mci_readl(host, CTRL); 464 temp &= ~SDMMC_CTRL_USE_IDMAC; 465 temp |= SDMMC_CTRL_DMA_RESET; 466 mci_writel(host, CTRL, temp); 467 468 /* Stop the IDMAC running */ 469 temp = mci_readl(host, BMOD); 470 temp &= ~(SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB); 471 temp |= SDMMC_IDMAC_SWRESET; 472 mci_writel(host, BMOD, temp); 473 } 474 475 static void dw_mci_dmac_complete_dma(void *arg) 476 { 477 struct dw_mci *host = arg; 478 struct mmc_data *data = host->data; 479 480 dev_vdbg(host->dev, "DMA complete\n"); 481 482 if ((host->use_dma == TRANS_MODE_EDMAC) && 483 data && (data->flags & MMC_DATA_READ)) 484 /* Invalidate cache after read */ 485 dma_sync_sg_for_cpu(mmc_dev(host->slot->mmc), 486 data->sg, 487 data->sg_len, 488 DMA_FROM_DEVICE); 489 490 host->dma_ops->cleanup(host); 491 492 /* 493 * If the card was removed, data will be NULL. No point in trying to 494 * send the stop command or waiting for NBUSY in this case. 495 */ 496 if (data) { 497 set_bit(EVENT_XFER_COMPLETE, &host->pending_events); 498 tasklet_schedule(&host->tasklet); 499 } 500 } 501 502 static int dw_mci_idmac_init(struct dw_mci *host) 503 { 504 int i; 505 506 if (host->dma_64bit_address == 1) { 507 struct idmac_desc_64addr *p; 508 /* Number of descriptors in the ring buffer */ 509 host->ring_size = 510 DESC_RING_BUF_SZ / sizeof(struct idmac_desc_64addr); 511 512 /* Forward link the descriptor list */ 513 for (i = 0, p = host->sg_cpu; i < host->ring_size - 1; 514 i++, p++) { 515 p->des6 = (host->sg_dma + 516 (sizeof(struct idmac_desc_64addr) * 517 (i + 1))) & 0xffffffff; 518 519 p->des7 = (u64)(host->sg_dma + 520 (sizeof(struct idmac_desc_64addr) * 521 (i + 1))) >> 32; 522 /* Initialize reserved and buffer size fields to "0" */ 523 p->des0 = 0; 524 p->des1 = 0; 525 p->des2 = 0; 526 p->des3 = 0; 527 } 528 529 /* Set the last descriptor as the end-of-ring descriptor */ 530 p->des6 = host->sg_dma & 0xffffffff; 531 p->des7 = (u64)host->sg_dma >> 32; 532 p->des0 = IDMAC_DES0_ER; 533 534 } else { 535 struct idmac_desc *p; 536 /* Number of descriptors in the ring buffer */ 537 host->ring_size = 538 DESC_RING_BUF_SZ / sizeof(struct idmac_desc); 539 540 /* Forward link the descriptor list */ 541 for (i = 0, p = host->sg_cpu; 542 i < host->ring_size - 1; 543 i++, p++) { 544 p->des3 = cpu_to_le32(host->sg_dma + 545 (sizeof(struct idmac_desc) * (i + 1))); 546 p->des0 = 0; 547 p->des1 = 0; 548 } 549 550 /* Set the last descriptor as the end-of-ring descriptor */ 551 p->des3 = cpu_to_le32(host->sg_dma); 552 p->des0 = cpu_to_le32(IDMAC_DES0_ER); 553 } 554 555 dw_mci_idmac_reset(host); 556 557 if (host->dma_64bit_address == 1) { 558 /* Mask out interrupts - get Tx & Rx complete only */ 559 mci_writel(host, IDSTS64, IDMAC_INT_CLR); 560 mci_writel(host, IDINTEN64, SDMMC_IDMAC_INT_NI | 561 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI); 562 563 /* Set the descriptor base address */ 564 mci_writel(host, DBADDRL, host->sg_dma & 0xffffffff); 565 mci_writel(host, DBADDRU, (u64)host->sg_dma >> 32); 566 567 } else { 568 /* Mask out interrupts - get Tx & Rx complete only */ 569 mci_writel(host, IDSTS, IDMAC_INT_CLR); 570 mci_writel(host, IDINTEN, SDMMC_IDMAC_INT_NI | 571 SDMMC_IDMAC_INT_RI | SDMMC_IDMAC_INT_TI); 572 573 /* Set the descriptor base address */ 574 mci_writel(host, DBADDR, host->sg_dma); 575 } 576 577 return 0; 578 } 579 580 static inline int dw_mci_prepare_desc64(struct dw_mci *host, 581 struct mmc_data *data, 582 unsigned int sg_len) 583 { 584 unsigned int desc_len; 585 struct idmac_desc_64addr *desc_first, *desc_last, *desc; 586 u32 val; 587 int i; 588 589 desc_first = desc_last = desc = host->sg_cpu; 590 591 for (i = 0; i < sg_len; i++) { 592 unsigned int length = sg_dma_len(&data->sg[i]); 593 594 u64 mem_addr = sg_dma_address(&data->sg[i]); 595 596 for ( ; length ; desc++) { 597 desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ? 598 length : DW_MCI_DESC_DATA_LENGTH; 599 600 length -= desc_len; 601 602 /* 603 * Wait for the former clear OWN bit operation 604 * of IDMAC to make sure that this descriptor 605 * isn't still owned by IDMAC as IDMAC's write 606 * ops and CPU's read ops are asynchronous. 607 */ 608 if (readl_poll_timeout_atomic(&desc->des0, val, 609 !(val & IDMAC_DES0_OWN), 610 10, 100 * USEC_PER_MSEC)) 611 goto err_own_bit; 612 613 /* 614 * Set the OWN bit and disable interrupts 615 * for this descriptor 616 */ 617 desc->des0 = IDMAC_DES0_OWN | IDMAC_DES0_DIC | 618 IDMAC_DES0_CH; 619 620 /* Buffer length */ 621 IDMAC_64ADDR_SET_BUFFER1_SIZE(desc, desc_len); 622 623 /* Physical address to DMA to/from */ 624 desc->des4 = mem_addr & 0xffffffff; 625 desc->des5 = mem_addr >> 32; 626 627 /* Update physical address for the next desc */ 628 mem_addr += desc_len; 629 630 /* Save pointer to the last descriptor */ 631 desc_last = desc; 632 } 633 } 634 635 /* Set first descriptor */ 636 desc_first->des0 |= IDMAC_DES0_FD; 637 638 /* Set last descriptor */ 639 desc_last->des0 &= ~(IDMAC_DES0_CH | IDMAC_DES0_DIC); 640 desc_last->des0 |= IDMAC_DES0_LD; 641 642 return 0; 643 err_own_bit: 644 /* restore the descriptor chain as it's polluted */ 645 dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n"); 646 memset(host->sg_cpu, 0, DESC_RING_BUF_SZ); 647 dw_mci_idmac_init(host); 648 return -EINVAL; 649 } 650 651 652 static inline int dw_mci_prepare_desc32(struct dw_mci *host, 653 struct mmc_data *data, 654 unsigned int sg_len) 655 { 656 unsigned int desc_len; 657 struct idmac_desc *desc_first, *desc_last, *desc; 658 u32 val; 659 int i; 660 661 desc_first = desc_last = desc = host->sg_cpu; 662 663 for (i = 0; i < sg_len; i++) { 664 unsigned int length = sg_dma_len(&data->sg[i]); 665 666 u32 mem_addr = sg_dma_address(&data->sg[i]); 667 668 for ( ; length ; desc++) { 669 desc_len = (length <= DW_MCI_DESC_DATA_LENGTH) ? 670 length : DW_MCI_DESC_DATA_LENGTH; 671 672 length -= desc_len; 673 674 /* 675 * Wait for the former clear OWN bit operation 676 * of IDMAC to make sure that this descriptor 677 * isn't still owned by IDMAC as IDMAC's write 678 * ops and CPU's read ops are asynchronous. 679 */ 680 if (readl_poll_timeout_atomic(&desc->des0, val, 681 IDMAC_OWN_CLR64(val), 682 10, 683 100 * USEC_PER_MSEC)) 684 goto err_own_bit; 685 686 /* 687 * Set the OWN bit and disable interrupts 688 * for this descriptor 689 */ 690 desc->des0 = cpu_to_le32(IDMAC_DES0_OWN | 691 IDMAC_DES0_DIC | 692 IDMAC_DES0_CH); 693 694 /* Buffer length */ 695 IDMAC_SET_BUFFER1_SIZE(desc, desc_len); 696 697 /* Physical address to DMA to/from */ 698 desc->des2 = cpu_to_le32(mem_addr); 699 700 /* Update physical address for the next desc */ 701 mem_addr += desc_len; 702 703 /* Save pointer to the last descriptor */ 704 desc_last = desc; 705 } 706 } 707 708 /* Set first descriptor */ 709 desc_first->des0 |= cpu_to_le32(IDMAC_DES0_FD); 710 711 /* Set last descriptor */ 712 desc_last->des0 &= cpu_to_le32(~(IDMAC_DES0_CH | 713 IDMAC_DES0_DIC)); 714 desc_last->des0 |= cpu_to_le32(IDMAC_DES0_LD); 715 716 return 0; 717 err_own_bit: 718 /* restore the descriptor chain as it's polluted */ 719 dev_dbg(host->dev, "descriptor is still owned by IDMAC.\n"); 720 memset(host->sg_cpu, 0, DESC_RING_BUF_SZ); 721 dw_mci_idmac_init(host); 722 return -EINVAL; 723 } 724 725 static int dw_mci_idmac_start_dma(struct dw_mci *host, unsigned int sg_len) 726 { 727 u32 temp; 728 int ret; 729 730 if (host->dma_64bit_address == 1) 731 ret = dw_mci_prepare_desc64(host, host->data, sg_len); 732 else 733 ret = dw_mci_prepare_desc32(host, host->data, sg_len); 734 735 if (ret) 736 goto out; 737 738 /* drain writebuffer */ 739 wmb(); 740 741 /* Make sure to reset DMA in case we did PIO before this */ 742 dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET); 743 dw_mci_idmac_reset(host); 744 745 /* Select IDMAC interface */ 746 temp = mci_readl(host, CTRL); 747 temp |= SDMMC_CTRL_USE_IDMAC; 748 mci_writel(host, CTRL, temp); 749 750 /* drain writebuffer */ 751 wmb(); 752 753 /* Enable the IDMAC */ 754 temp = mci_readl(host, BMOD); 755 temp |= SDMMC_IDMAC_ENABLE | SDMMC_IDMAC_FB; 756 mci_writel(host, BMOD, temp); 757 758 /* Start it running */ 759 mci_writel(host, PLDMND, 1); 760 761 out: 762 return ret; 763 } 764 765 static const struct dw_mci_dma_ops dw_mci_idmac_ops = { 766 .init = dw_mci_idmac_init, 767 .start = dw_mci_idmac_start_dma, 768 .stop = dw_mci_idmac_stop_dma, 769 .complete = dw_mci_dmac_complete_dma, 770 .cleanup = dw_mci_dma_cleanup, 771 }; 772 773 static void dw_mci_edmac_stop_dma(struct dw_mci *host) 774 { 775 dmaengine_terminate_async(host->dms->ch); 776 } 777 778 static int dw_mci_edmac_start_dma(struct dw_mci *host, 779 unsigned int sg_len) 780 { 781 struct dma_slave_config cfg; 782 struct dma_async_tx_descriptor *desc = NULL; 783 struct scatterlist *sgl = host->data->sg; 784 static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256}; 785 u32 sg_elems = host->data->sg_len; 786 u32 fifoth_val; 787 u32 fifo_offset = host->fifo_reg - host->regs; 788 int ret = 0; 789 790 /* Set external dma config: burst size, burst width */ 791 memset(&cfg, 0, sizeof(cfg)); 792 cfg.dst_addr = host->phy_regs + fifo_offset; 793 cfg.src_addr = cfg.dst_addr; 794 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 795 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; 796 797 /* Match burst msize with external dma config */ 798 fifoth_val = mci_readl(host, FIFOTH); 799 cfg.dst_maxburst = mszs[(fifoth_val >> 28) & 0x7]; 800 cfg.src_maxburst = cfg.dst_maxburst; 801 802 if (host->data->flags & MMC_DATA_WRITE) 803 cfg.direction = DMA_MEM_TO_DEV; 804 else 805 cfg.direction = DMA_DEV_TO_MEM; 806 807 ret = dmaengine_slave_config(host->dms->ch, &cfg); 808 if (ret) { 809 dev_err(host->dev, "Failed to config edmac.\n"); 810 return -EBUSY; 811 } 812 813 desc = dmaengine_prep_slave_sg(host->dms->ch, sgl, 814 sg_len, cfg.direction, 815 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 816 if (!desc) { 817 dev_err(host->dev, "Can't prepare slave sg.\n"); 818 return -EBUSY; 819 } 820 821 /* Set dw_mci_dmac_complete_dma as callback */ 822 desc->callback = dw_mci_dmac_complete_dma; 823 desc->callback_param = (void *)host; 824 dmaengine_submit(desc); 825 826 /* Flush cache before write */ 827 if (host->data->flags & MMC_DATA_WRITE) 828 dma_sync_sg_for_device(mmc_dev(host->slot->mmc), sgl, 829 sg_elems, DMA_TO_DEVICE); 830 831 dma_async_issue_pending(host->dms->ch); 832 833 return 0; 834 } 835 836 static int dw_mci_edmac_init(struct dw_mci *host) 837 { 838 /* Request external dma channel */ 839 host->dms = kzalloc(sizeof(struct dw_mci_dma_slave), GFP_KERNEL); 840 if (!host->dms) 841 return -ENOMEM; 842 843 host->dms->ch = dma_request_chan(host->dev, "rx-tx"); 844 if (IS_ERR(host->dms->ch)) { 845 int ret = PTR_ERR(host->dms->ch); 846 847 dev_err(host->dev, "Failed to get external DMA channel.\n"); 848 kfree(host->dms); 849 host->dms = NULL; 850 return ret; 851 } 852 853 return 0; 854 } 855 856 static void dw_mci_edmac_exit(struct dw_mci *host) 857 { 858 if (host->dms) { 859 if (host->dms->ch) { 860 dma_release_channel(host->dms->ch); 861 host->dms->ch = NULL; 862 } 863 kfree(host->dms); 864 host->dms = NULL; 865 } 866 } 867 868 static const struct dw_mci_dma_ops dw_mci_edmac_ops = { 869 .init = dw_mci_edmac_init, 870 .exit = dw_mci_edmac_exit, 871 .start = dw_mci_edmac_start_dma, 872 .stop = dw_mci_edmac_stop_dma, 873 .complete = dw_mci_dmac_complete_dma, 874 .cleanup = dw_mci_dma_cleanup, 875 }; 876 877 static int dw_mci_pre_dma_transfer(struct dw_mci *host, 878 struct mmc_data *data, 879 int cookie) 880 { 881 struct scatterlist *sg; 882 unsigned int i, sg_len; 883 884 if (data->host_cookie == COOKIE_PRE_MAPPED) 885 return data->sg_len; 886 887 /* 888 * We don't do DMA on "complex" transfers, i.e. with 889 * non-word-aligned buffers or lengths. Also, we don't bother 890 * with all the DMA setup overhead for short transfers. 891 */ 892 if (data->blocks * data->blksz < DW_MCI_DMA_THRESHOLD) 893 return -EINVAL; 894 895 if (data->blksz & 3) 896 return -EINVAL; 897 898 for_each_sg(data->sg, sg, data->sg_len, i) { 899 if (sg->offset & 3 || sg->length & 3) 900 return -EINVAL; 901 } 902 903 sg_len = dma_map_sg(host->dev, 904 data->sg, 905 data->sg_len, 906 mmc_get_dma_dir(data)); 907 if (sg_len == 0) 908 return -EINVAL; 909 910 data->host_cookie = cookie; 911 912 return sg_len; 913 } 914 915 static void dw_mci_pre_req(struct mmc_host *mmc, 916 struct mmc_request *mrq) 917 { 918 struct dw_mci_slot *slot = mmc_priv(mmc); 919 struct mmc_data *data = mrq->data; 920 921 if (!slot->host->use_dma || !data) 922 return; 923 924 /* This data might be unmapped at this time */ 925 data->host_cookie = COOKIE_UNMAPPED; 926 927 if (dw_mci_pre_dma_transfer(slot->host, mrq->data, 928 COOKIE_PRE_MAPPED) < 0) 929 data->host_cookie = COOKIE_UNMAPPED; 930 } 931 932 static void dw_mci_post_req(struct mmc_host *mmc, 933 struct mmc_request *mrq, 934 int err) 935 { 936 struct dw_mci_slot *slot = mmc_priv(mmc); 937 struct mmc_data *data = mrq->data; 938 939 if (!slot->host->use_dma || !data) 940 return; 941 942 if (data->host_cookie != COOKIE_UNMAPPED) 943 dma_unmap_sg(slot->host->dev, 944 data->sg, 945 data->sg_len, 946 mmc_get_dma_dir(data)); 947 data->host_cookie = COOKIE_UNMAPPED; 948 } 949 950 static int dw_mci_get_cd(struct mmc_host *mmc) 951 { 952 int present; 953 struct dw_mci_slot *slot = mmc_priv(mmc); 954 struct dw_mci *host = slot->host; 955 int gpio_cd = mmc_gpio_get_cd(mmc); 956 957 /* Use platform get_cd function, else try onboard card detect */ 958 if (((mmc->caps & MMC_CAP_NEEDS_POLL) 959 || !mmc_card_is_removable(mmc))) { 960 present = 1; 961 962 if (!test_bit(DW_MMC_CARD_PRESENT, &slot->flags)) { 963 if (mmc->caps & MMC_CAP_NEEDS_POLL) { 964 dev_info(&mmc->class_dev, 965 "card is polling.\n"); 966 } else { 967 dev_info(&mmc->class_dev, 968 "card is non-removable.\n"); 969 } 970 set_bit(DW_MMC_CARD_PRESENT, &slot->flags); 971 } 972 973 return present; 974 } else if (gpio_cd >= 0) 975 present = gpio_cd; 976 else 977 present = (mci_readl(slot->host, CDETECT) & (1 << slot->id)) 978 == 0 ? 1 : 0; 979 980 spin_lock_bh(&host->lock); 981 if (present && !test_and_set_bit(DW_MMC_CARD_PRESENT, &slot->flags)) 982 dev_dbg(&mmc->class_dev, "card is present\n"); 983 else if (!present && 984 !test_and_clear_bit(DW_MMC_CARD_PRESENT, &slot->flags)) 985 dev_dbg(&mmc->class_dev, "card is not present\n"); 986 spin_unlock_bh(&host->lock); 987 988 return present; 989 } 990 991 static void dw_mci_adjust_fifoth(struct dw_mci *host, struct mmc_data *data) 992 { 993 unsigned int blksz = data->blksz; 994 static const u32 mszs[] = {1, 4, 8, 16, 32, 64, 128, 256}; 995 u32 fifo_width = 1 << host->data_shift; 996 u32 blksz_depth = blksz / fifo_width, fifoth_val; 997 u32 msize = 0, rx_wmark = 1, tx_wmark, tx_wmark_invers; 998 int idx = ARRAY_SIZE(mszs) - 1; 999 1000 /* pio should ship this scenario */ 1001 if (!host->use_dma) 1002 return; 1003 1004 tx_wmark = (host->fifo_depth) / 2; 1005 tx_wmark_invers = host->fifo_depth - tx_wmark; 1006 1007 /* 1008 * MSIZE is '1', 1009 * if blksz is not a multiple of the FIFO width 1010 */ 1011 if (blksz % fifo_width) 1012 goto done; 1013 1014 do { 1015 if (!((blksz_depth % mszs[idx]) || 1016 (tx_wmark_invers % mszs[idx]))) { 1017 msize = idx; 1018 rx_wmark = mszs[idx] - 1; 1019 break; 1020 } 1021 } while (--idx > 0); 1022 /* 1023 * If idx is '0', it won't be tried 1024 * Thus, initial values are uesed 1025 */ 1026 done: 1027 fifoth_val = SDMMC_SET_FIFOTH(msize, rx_wmark, tx_wmark); 1028 mci_writel(host, FIFOTH, fifoth_val); 1029 } 1030 1031 static void dw_mci_ctrl_thld(struct dw_mci *host, struct mmc_data *data) 1032 { 1033 unsigned int blksz = data->blksz; 1034 u32 blksz_depth, fifo_depth; 1035 u16 thld_size; 1036 u8 enable; 1037 1038 /* 1039 * CDTHRCTL doesn't exist prior to 240A (in fact that register offset is 1040 * in the FIFO region, so we really shouldn't access it). 1041 */ 1042 if (host->verid < DW_MMC_240A || 1043 (host->verid < DW_MMC_280A && data->flags & MMC_DATA_WRITE)) 1044 return; 1045 1046 /* 1047 * Card write Threshold is introduced since 2.80a 1048 * It's used when HS400 mode is enabled. 1049 */ 1050 if (data->flags & MMC_DATA_WRITE && 1051 host->timing != MMC_TIMING_MMC_HS400) 1052 goto disable; 1053 1054 if (data->flags & MMC_DATA_WRITE) 1055 enable = SDMMC_CARD_WR_THR_EN; 1056 else 1057 enable = SDMMC_CARD_RD_THR_EN; 1058 1059 if (host->timing != MMC_TIMING_MMC_HS200 && 1060 host->timing != MMC_TIMING_UHS_SDR104 && 1061 host->timing != MMC_TIMING_MMC_HS400) 1062 goto disable; 1063 1064 blksz_depth = blksz / (1 << host->data_shift); 1065 fifo_depth = host->fifo_depth; 1066 1067 if (blksz_depth > fifo_depth) 1068 goto disable; 1069 1070 /* 1071 * If (blksz_depth) >= (fifo_depth >> 1), should be 'thld_size <= blksz' 1072 * If (blksz_depth) < (fifo_depth >> 1), should be thld_size = blksz 1073 * Currently just choose blksz. 1074 */ 1075 thld_size = blksz; 1076 mci_writel(host, CDTHRCTL, SDMMC_SET_THLD(thld_size, enable)); 1077 return; 1078 1079 disable: 1080 mci_writel(host, CDTHRCTL, 0); 1081 } 1082 1083 static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data) 1084 { 1085 unsigned long irqflags; 1086 int sg_len; 1087 u32 temp; 1088 1089 host->using_dma = 0; 1090 1091 /* If we don't have a channel, we can't do DMA */ 1092 if (!host->use_dma) 1093 return -ENODEV; 1094 1095 sg_len = dw_mci_pre_dma_transfer(host, data, COOKIE_MAPPED); 1096 if (sg_len < 0) { 1097 host->dma_ops->stop(host); 1098 return sg_len; 1099 } 1100 1101 host->using_dma = 1; 1102 1103 if (host->use_dma == TRANS_MODE_IDMAC) 1104 dev_vdbg(host->dev, 1105 "sd sg_cpu: %#lx sg_dma: %#lx sg_len: %d\n", 1106 (unsigned long)host->sg_cpu, 1107 (unsigned long)host->sg_dma, 1108 sg_len); 1109 1110 /* 1111 * Decide the MSIZE and RX/TX Watermark. 1112 * If current block size is same with previous size, 1113 * no need to update fifoth. 1114 */ 1115 if (host->prev_blksz != data->blksz) 1116 dw_mci_adjust_fifoth(host, data); 1117 1118 /* Enable the DMA interface */ 1119 temp = mci_readl(host, CTRL); 1120 temp |= SDMMC_CTRL_DMA_ENABLE; 1121 mci_writel(host, CTRL, temp); 1122 1123 /* Disable RX/TX IRQs, let DMA handle it */ 1124 spin_lock_irqsave(&host->irq_lock, irqflags); 1125 temp = mci_readl(host, INTMASK); 1126 temp &= ~(SDMMC_INT_RXDR | SDMMC_INT_TXDR); 1127 mci_writel(host, INTMASK, temp); 1128 spin_unlock_irqrestore(&host->irq_lock, irqflags); 1129 1130 if (host->dma_ops->start(host, sg_len)) { 1131 host->dma_ops->stop(host); 1132 /* We can't do DMA, try PIO for this one */ 1133 dev_dbg(host->dev, 1134 "%s: fall back to PIO mode for current transfer\n", 1135 __func__); 1136 return -ENODEV; 1137 } 1138 1139 return 0; 1140 } 1141 1142 static void dw_mci_submit_data(struct dw_mci *host, struct mmc_data *data) 1143 { 1144 unsigned long irqflags; 1145 int flags = SG_MITER_ATOMIC; 1146 u32 temp; 1147 1148 data->error = -EINPROGRESS; 1149 1150 WARN_ON(host->data); 1151 host->sg = NULL; 1152 host->data = data; 1153 1154 if (data->flags & MMC_DATA_READ) 1155 host->dir_status = DW_MCI_RECV_STATUS; 1156 else 1157 host->dir_status = DW_MCI_SEND_STATUS; 1158 1159 dw_mci_ctrl_thld(host, data); 1160 1161 if (dw_mci_submit_data_dma(host, data)) { 1162 if (host->data->flags & MMC_DATA_READ) 1163 flags |= SG_MITER_TO_SG; 1164 else 1165 flags |= SG_MITER_FROM_SG; 1166 1167 sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags); 1168 host->sg = data->sg; 1169 host->part_buf_start = 0; 1170 host->part_buf_count = 0; 1171 1172 mci_writel(host, RINTSTS, SDMMC_INT_TXDR | SDMMC_INT_RXDR); 1173 1174 spin_lock_irqsave(&host->irq_lock, irqflags); 1175 temp = mci_readl(host, INTMASK); 1176 temp |= SDMMC_INT_TXDR | SDMMC_INT_RXDR; 1177 mci_writel(host, INTMASK, temp); 1178 spin_unlock_irqrestore(&host->irq_lock, irqflags); 1179 1180 temp = mci_readl(host, CTRL); 1181 temp &= ~SDMMC_CTRL_DMA_ENABLE; 1182 mci_writel(host, CTRL, temp); 1183 1184 /* 1185 * Use the initial fifoth_val for PIO mode. If wm_algined 1186 * is set, we set watermark same as data size. 1187 * If next issued data may be transfered by DMA mode, 1188 * prev_blksz should be invalidated. 1189 */ 1190 if (host->wm_aligned) 1191 dw_mci_adjust_fifoth(host, data); 1192 else 1193 mci_writel(host, FIFOTH, host->fifoth_val); 1194 host->prev_blksz = 0; 1195 } else { 1196 /* 1197 * Keep the current block size. 1198 * It will be used to decide whether to update 1199 * fifoth register next time. 1200 */ 1201 host->prev_blksz = data->blksz; 1202 } 1203 } 1204 1205 static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit) 1206 { 1207 struct dw_mci *host = slot->host; 1208 unsigned int clock = slot->clock; 1209 u32 div; 1210 u32 clk_en_a; 1211 u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT; 1212 1213 /* We must continue to set bit 28 in CMD until the change is complete */ 1214 if (host->state == STATE_WAITING_CMD11_DONE) 1215 sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH; 1216 1217 slot->mmc->actual_clock = 0; 1218 1219 if (!clock) { 1220 mci_writel(host, CLKENA, 0); 1221 mci_send_cmd(slot, sdmmc_cmd_bits, 0); 1222 } else if (clock != host->current_speed || force_clkinit) { 1223 div = host->bus_hz / clock; 1224 if (host->bus_hz % clock && host->bus_hz > clock) 1225 /* 1226 * move the + 1 after the divide to prevent 1227 * over-clocking the card. 1228 */ 1229 div += 1; 1230 1231 div = (host->bus_hz != clock) ? DIV_ROUND_UP(div, 2) : 0; 1232 1233 if ((clock != slot->__clk_old && 1234 !test_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags)) || 1235 force_clkinit) { 1236 /* Silent the verbose log if calling from PM context */ 1237 if (!force_clkinit) 1238 dev_info(&slot->mmc->class_dev, 1239 "Bus speed (slot %d) = %dHz (slot req %dHz, actual %dHZ div = %d)\n", 1240 slot->id, host->bus_hz, clock, 1241 div ? ((host->bus_hz / div) >> 1) : 1242 host->bus_hz, div); 1243 1244 /* 1245 * If card is polling, display the message only 1246 * one time at boot time. 1247 */ 1248 if (slot->mmc->caps & MMC_CAP_NEEDS_POLL && 1249 slot->mmc->f_min == clock) 1250 set_bit(DW_MMC_CARD_NEEDS_POLL, &slot->flags); 1251 } 1252 1253 /* disable clock */ 1254 mci_writel(host, CLKENA, 0); 1255 mci_writel(host, CLKSRC, 0); 1256 1257 /* inform CIU */ 1258 mci_send_cmd(slot, sdmmc_cmd_bits, 0); 1259 1260 /* set clock to desired speed */ 1261 mci_writel(host, CLKDIV, div); 1262 1263 /* inform CIU */ 1264 mci_send_cmd(slot, sdmmc_cmd_bits, 0); 1265 1266 /* enable clock; only low power if no SDIO */ 1267 clk_en_a = SDMMC_CLKEN_ENABLE << slot->id; 1268 if (!test_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags)) 1269 clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id; 1270 mci_writel(host, CLKENA, clk_en_a); 1271 1272 /* inform CIU */ 1273 mci_send_cmd(slot, sdmmc_cmd_bits, 0); 1274 1275 /* keep the last clock value that was requested from core */ 1276 slot->__clk_old = clock; 1277 slot->mmc->actual_clock = div ? ((host->bus_hz / div) >> 1) : 1278 host->bus_hz; 1279 } 1280 1281 host->current_speed = clock; 1282 1283 /* Set the current slot bus width */ 1284 mci_writel(host, CTYPE, (slot->ctype << slot->id)); 1285 } 1286 1287 static void dw_mci_set_data_timeout(struct dw_mci *host, 1288 unsigned int timeout_ns) 1289 { 1290 const struct dw_mci_drv_data *drv_data = host->drv_data; 1291 u32 clk_div, tmout; 1292 u64 tmp; 1293 1294 if (drv_data && drv_data->set_data_timeout) 1295 return drv_data->set_data_timeout(host, timeout_ns); 1296 1297 clk_div = (mci_readl(host, CLKDIV) & 0xFF) * 2; 1298 if (clk_div == 0) 1299 clk_div = 1; 1300 1301 tmp = DIV_ROUND_UP_ULL((u64)timeout_ns * host->bus_hz, NSEC_PER_SEC); 1302 tmp = DIV_ROUND_UP_ULL(tmp, clk_div); 1303 1304 /* TMOUT[7:0] (RESPONSE_TIMEOUT) */ 1305 tmout = 0xFF; /* Set maximum */ 1306 1307 /* TMOUT[31:8] (DATA_TIMEOUT) */ 1308 if (!tmp || tmp > 0xFFFFFF) 1309 tmout |= (0xFFFFFF << 8); 1310 else 1311 tmout |= (tmp & 0xFFFFFF) << 8; 1312 1313 mci_writel(host, TMOUT, tmout); 1314 dev_dbg(host->dev, "timeout_ns: %u => TMOUT[31:8]: %#08x", 1315 timeout_ns, tmout >> 8); 1316 } 1317 1318 static void __dw_mci_start_request(struct dw_mci *host, 1319 struct dw_mci_slot *slot, 1320 struct mmc_command *cmd) 1321 { 1322 struct mmc_request *mrq; 1323 struct mmc_data *data; 1324 u32 cmdflags; 1325 1326 mrq = slot->mrq; 1327 1328 host->mrq = mrq; 1329 1330 host->pending_events = 0; 1331 host->completed_events = 0; 1332 host->cmd_status = 0; 1333 host->data_status = 0; 1334 host->dir_status = 0; 1335 1336 data = cmd->data; 1337 if (data) { 1338 dw_mci_set_data_timeout(host, data->timeout_ns); 1339 mci_writel(host, BYTCNT, data->blksz*data->blocks); 1340 mci_writel(host, BLKSIZ, data->blksz); 1341 } 1342 1343 cmdflags = dw_mci_prepare_command(slot->mmc, cmd); 1344 1345 /* this is the first command, send the initialization clock */ 1346 if (test_and_clear_bit(DW_MMC_CARD_NEED_INIT, &slot->flags)) 1347 cmdflags |= SDMMC_CMD_INIT; 1348 1349 if (data) { 1350 dw_mci_submit_data(host, data); 1351 wmb(); /* drain writebuffer */ 1352 } 1353 1354 dw_mci_start_command(host, cmd, cmdflags); 1355 1356 if (cmd->opcode == SD_SWITCH_VOLTAGE) { 1357 unsigned long irqflags; 1358 1359 /* 1360 * Databook says to fail after 2ms w/ no response, but evidence 1361 * shows that sometimes the cmd11 interrupt takes over 130ms. 1362 * We'll set to 500ms, plus an extra jiffy just in case jiffies 1363 * is just about to roll over. 1364 * 1365 * We do this whole thing under spinlock and only if the 1366 * command hasn't already completed (indicating the the irq 1367 * already ran so we don't want the timeout). 1368 */ 1369 spin_lock_irqsave(&host->irq_lock, irqflags); 1370 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) 1371 mod_timer(&host->cmd11_timer, 1372 jiffies + msecs_to_jiffies(500) + 1); 1373 spin_unlock_irqrestore(&host->irq_lock, irqflags); 1374 } 1375 1376 host->stop_cmdr = dw_mci_prep_stop_abort(host, cmd); 1377 } 1378 1379 static void dw_mci_start_request(struct dw_mci *host, 1380 struct dw_mci_slot *slot) 1381 { 1382 struct mmc_request *mrq = slot->mrq; 1383 struct mmc_command *cmd; 1384 1385 cmd = mrq->sbc ? mrq->sbc : mrq->cmd; 1386 __dw_mci_start_request(host, slot, cmd); 1387 } 1388 1389 /* must be called with host->lock held */ 1390 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot, 1391 struct mmc_request *mrq) 1392 { 1393 dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n", 1394 host->state); 1395 1396 slot->mrq = mrq; 1397 1398 if (host->state == STATE_WAITING_CMD11_DONE) { 1399 dev_warn(&slot->mmc->class_dev, 1400 "Voltage change didn't complete\n"); 1401 /* 1402 * this case isn't expected to happen, so we can 1403 * either crash here or just try to continue on 1404 * in the closest possible state 1405 */ 1406 host->state = STATE_IDLE; 1407 } 1408 1409 if (host->state == STATE_IDLE) { 1410 host->state = STATE_SENDING_CMD; 1411 dw_mci_start_request(host, slot); 1412 } else { 1413 list_add_tail(&slot->queue_node, &host->queue); 1414 } 1415 } 1416 1417 static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) 1418 { 1419 struct dw_mci_slot *slot = mmc_priv(mmc); 1420 struct dw_mci *host = slot->host; 1421 1422 WARN_ON(slot->mrq); 1423 1424 /* 1425 * The check for card presence and queueing of the request must be 1426 * atomic, otherwise the card could be removed in between and the 1427 * request wouldn't fail until another card was inserted. 1428 */ 1429 1430 if (!dw_mci_get_cd(mmc)) { 1431 mrq->cmd->error = -ENOMEDIUM; 1432 mmc_request_done(mmc, mrq); 1433 return; 1434 } 1435 1436 spin_lock_bh(&host->lock); 1437 1438 dw_mci_queue_request(host, slot, mrq); 1439 1440 spin_unlock_bh(&host->lock); 1441 } 1442 1443 static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 1444 { 1445 struct dw_mci_slot *slot = mmc_priv(mmc); 1446 const struct dw_mci_drv_data *drv_data = slot->host->drv_data; 1447 u32 regs; 1448 int ret; 1449 1450 switch (ios->bus_width) { 1451 case MMC_BUS_WIDTH_4: 1452 slot->ctype = SDMMC_CTYPE_4BIT; 1453 break; 1454 case MMC_BUS_WIDTH_8: 1455 slot->ctype = SDMMC_CTYPE_8BIT; 1456 break; 1457 default: 1458 /* set default 1 bit mode */ 1459 slot->ctype = SDMMC_CTYPE_1BIT; 1460 } 1461 1462 regs = mci_readl(slot->host, UHS_REG); 1463 1464 /* DDR mode set */ 1465 if (ios->timing == MMC_TIMING_MMC_DDR52 || 1466 ios->timing == MMC_TIMING_UHS_DDR50 || 1467 ios->timing == MMC_TIMING_MMC_HS400) 1468 regs |= ((0x1 << slot->id) << 16); 1469 else 1470 regs &= ~((0x1 << slot->id) << 16); 1471 1472 mci_writel(slot->host, UHS_REG, regs); 1473 slot->host->timing = ios->timing; 1474 1475 /* 1476 * Use mirror of ios->clock to prevent race with mmc 1477 * core ios update when finding the minimum. 1478 */ 1479 slot->clock = ios->clock; 1480 1481 if (drv_data && drv_data->set_ios) 1482 drv_data->set_ios(slot->host, ios); 1483 1484 switch (ios->power_mode) { 1485 case MMC_POWER_UP: 1486 if (!IS_ERR(mmc->supply.vmmc)) { 1487 ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 1488 ios->vdd); 1489 if (ret) { 1490 dev_err(slot->host->dev, 1491 "failed to enable vmmc regulator\n"); 1492 /*return, if failed turn on vmmc*/ 1493 return; 1494 } 1495 } 1496 set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags); 1497 regs = mci_readl(slot->host, PWREN); 1498 regs |= (1 << slot->id); 1499 mci_writel(slot->host, PWREN, regs); 1500 break; 1501 case MMC_POWER_ON: 1502 if (!slot->host->vqmmc_enabled) { 1503 if (!IS_ERR(mmc->supply.vqmmc)) { 1504 ret = regulator_enable(mmc->supply.vqmmc); 1505 if (ret < 0) 1506 dev_err(slot->host->dev, 1507 "failed to enable vqmmc\n"); 1508 else 1509 slot->host->vqmmc_enabled = true; 1510 1511 } else { 1512 /* Keep track so we don't reset again */ 1513 slot->host->vqmmc_enabled = true; 1514 } 1515 1516 /* Reset our state machine after powering on */ 1517 dw_mci_ctrl_reset(slot->host, 1518 SDMMC_CTRL_ALL_RESET_FLAGS); 1519 } 1520 1521 /* Adjust clock / bus width after power is up */ 1522 dw_mci_setup_bus(slot, false); 1523 1524 break; 1525 case MMC_POWER_OFF: 1526 /* Turn clock off before power goes down */ 1527 dw_mci_setup_bus(slot, false); 1528 1529 if (!IS_ERR(mmc->supply.vmmc)) 1530 mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); 1531 1532 if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) 1533 regulator_disable(mmc->supply.vqmmc); 1534 slot->host->vqmmc_enabled = false; 1535 1536 regs = mci_readl(slot->host, PWREN); 1537 regs &= ~(1 << slot->id); 1538 mci_writel(slot->host, PWREN, regs); 1539 break; 1540 default: 1541 break; 1542 } 1543 1544 if (slot->host->state == STATE_WAITING_CMD11_DONE && ios->clock != 0) 1545 slot->host->state = STATE_IDLE; 1546 } 1547 1548 static int dw_mci_card_busy(struct mmc_host *mmc) 1549 { 1550 struct dw_mci_slot *slot = mmc_priv(mmc); 1551 u32 status; 1552 1553 /* 1554 * Check the busy bit which is low when DAT[3:0] 1555 * (the data lines) are 0000 1556 */ 1557 status = mci_readl(slot->host, STATUS); 1558 1559 return !!(status & SDMMC_STATUS_BUSY); 1560 } 1561 1562 static int dw_mci_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios) 1563 { 1564 struct dw_mci_slot *slot = mmc_priv(mmc); 1565 struct dw_mci *host = slot->host; 1566 const struct dw_mci_drv_data *drv_data = host->drv_data; 1567 u32 uhs; 1568 u32 v18 = SDMMC_UHS_18V << slot->id; 1569 int ret; 1570 1571 if (drv_data && drv_data->switch_voltage) 1572 return drv_data->switch_voltage(mmc, ios); 1573 1574 /* 1575 * Program the voltage. Note that some instances of dw_mmc may use 1576 * the UHS_REG for this. For other instances (like exynos) the UHS_REG 1577 * does no harm but you need to set the regulator directly. Try both. 1578 */ 1579 uhs = mci_readl(host, UHS_REG); 1580 if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) 1581 uhs &= ~v18; 1582 else 1583 uhs |= v18; 1584 1585 if (!IS_ERR(mmc->supply.vqmmc)) { 1586 ret = mmc_regulator_set_vqmmc(mmc, ios); 1587 if (ret < 0) { 1588 dev_dbg(&mmc->class_dev, 1589 "Regulator set error %d - %s V\n", 1590 ret, uhs & v18 ? "1.8" : "3.3"); 1591 return ret; 1592 } 1593 } 1594 mci_writel(host, UHS_REG, uhs); 1595 1596 return 0; 1597 } 1598 1599 static int dw_mci_get_ro(struct mmc_host *mmc) 1600 { 1601 int read_only; 1602 struct dw_mci_slot *slot = mmc_priv(mmc); 1603 int gpio_ro = mmc_gpio_get_ro(mmc); 1604 1605 /* Use platform get_ro function, else try on board write protect */ 1606 if (gpio_ro >= 0) 1607 read_only = gpio_ro; 1608 else 1609 read_only = 1610 mci_readl(slot->host, WRTPRT) & (1 << slot->id) ? 1 : 0; 1611 1612 dev_dbg(&mmc->class_dev, "card is %s\n", 1613 read_only ? "read-only" : "read-write"); 1614 1615 return read_only; 1616 } 1617 1618 static void dw_mci_hw_reset(struct mmc_host *mmc) 1619 { 1620 struct dw_mci_slot *slot = mmc_priv(mmc); 1621 struct dw_mci *host = slot->host; 1622 int reset; 1623 1624 if (host->use_dma == TRANS_MODE_IDMAC) 1625 dw_mci_idmac_reset(host); 1626 1627 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_DMA_RESET | 1628 SDMMC_CTRL_FIFO_RESET)) 1629 return; 1630 1631 /* 1632 * According to eMMC spec, card reset procedure: 1633 * tRstW >= 1us: RST_n pulse width 1634 * tRSCA >= 200us: RST_n to Command time 1635 * tRSTH >= 1us: RST_n high period 1636 */ 1637 reset = mci_readl(host, RST_N); 1638 reset &= ~(SDMMC_RST_HWACTIVE << slot->id); 1639 mci_writel(host, RST_N, reset); 1640 usleep_range(1, 2); 1641 reset |= SDMMC_RST_HWACTIVE << slot->id; 1642 mci_writel(host, RST_N, reset); 1643 usleep_range(200, 300); 1644 } 1645 1646 static void dw_mci_prepare_sdio_irq(struct dw_mci_slot *slot, bool prepare) 1647 { 1648 struct dw_mci *host = slot->host; 1649 const u32 clken_low_pwr = SDMMC_CLKEN_LOW_PWR << slot->id; 1650 u32 clk_en_a_old; 1651 u32 clk_en_a; 1652 1653 /* 1654 * Low power mode will stop the card clock when idle. According to the 1655 * description of the CLKENA register we should disable low power mode 1656 * for SDIO cards if we need SDIO interrupts to work. 1657 */ 1658 1659 clk_en_a_old = mci_readl(host, CLKENA); 1660 if (prepare) { 1661 set_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags); 1662 clk_en_a = clk_en_a_old & ~clken_low_pwr; 1663 } else { 1664 clear_bit(DW_MMC_CARD_NO_LOW_PWR, &slot->flags); 1665 clk_en_a = clk_en_a_old | clken_low_pwr; 1666 } 1667 1668 if (clk_en_a != clk_en_a_old) { 1669 mci_writel(host, CLKENA, clk_en_a); 1670 mci_send_cmd(slot, SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 1671 0); 1672 } 1673 } 1674 1675 static void __dw_mci_enable_sdio_irq(struct dw_mci_slot *slot, int enb) 1676 { 1677 struct dw_mci *host = slot->host; 1678 unsigned long irqflags; 1679 u32 int_mask; 1680 1681 spin_lock_irqsave(&host->irq_lock, irqflags); 1682 1683 /* Enable/disable Slot Specific SDIO interrupt */ 1684 int_mask = mci_readl(host, INTMASK); 1685 if (enb) 1686 int_mask |= SDMMC_INT_SDIO(slot->sdio_id); 1687 else 1688 int_mask &= ~SDMMC_INT_SDIO(slot->sdio_id); 1689 mci_writel(host, INTMASK, int_mask); 1690 1691 spin_unlock_irqrestore(&host->irq_lock, irqflags); 1692 } 1693 1694 static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb) 1695 { 1696 struct dw_mci_slot *slot = mmc_priv(mmc); 1697 struct dw_mci *host = slot->host; 1698 1699 dw_mci_prepare_sdio_irq(slot, enb); 1700 __dw_mci_enable_sdio_irq(slot, enb); 1701 1702 /* Avoid runtime suspending the device when SDIO IRQ is enabled */ 1703 if (enb) 1704 pm_runtime_get_noresume(host->dev); 1705 else 1706 pm_runtime_put_noidle(host->dev); 1707 } 1708 1709 static void dw_mci_ack_sdio_irq(struct mmc_host *mmc) 1710 { 1711 struct dw_mci_slot *slot = mmc_priv(mmc); 1712 1713 __dw_mci_enable_sdio_irq(slot, 1); 1714 } 1715 1716 static int dw_mci_execute_tuning(struct mmc_host *mmc, u32 opcode) 1717 { 1718 struct dw_mci_slot *slot = mmc_priv(mmc); 1719 struct dw_mci *host = slot->host; 1720 const struct dw_mci_drv_data *drv_data = host->drv_data; 1721 int err = -EINVAL; 1722 1723 if (drv_data && drv_data->execute_tuning) 1724 err = drv_data->execute_tuning(slot, opcode); 1725 return err; 1726 } 1727 1728 static int dw_mci_prepare_hs400_tuning(struct mmc_host *mmc, 1729 struct mmc_ios *ios) 1730 { 1731 struct dw_mci_slot *slot = mmc_priv(mmc); 1732 struct dw_mci *host = slot->host; 1733 const struct dw_mci_drv_data *drv_data = host->drv_data; 1734 1735 if (drv_data && drv_data->prepare_hs400_tuning) 1736 return drv_data->prepare_hs400_tuning(host, ios); 1737 1738 return 0; 1739 } 1740 1741 static bool dw_mci_reset(struct dw_mci *host) 1742 { 1743 u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; 1744 bool ret = false; 1745 u32 status = 0; 1746 1747 /* 1748 * Resetting generates a block interrupt, hence setting 1749 * the scatter-gather pointer to NULL. 1750 */ 1751 if (host->sg) { 1752 sg_miter_stop(&host->sg_miter); 1753 host->sg = NULL; 1754 } 1755 1756 if (host->use_dma) 1757 flags |= SDMMC_CTRL_DMA_RESET; 1758 1759 if (dw_mci_ctrl_reset(host, flags)) { 1760 /* 1761 * In all cases we clear the RAWINTS 1762 * register to clear any interrupts. 1763 */ 1764 mci_writel(host, RINTSTS, 0xFFFFFFFF); 1765 1766 if (!host->use_dma) { 1767 ret = true; 1768 goto ciu_out; 1769 } 1770 1771 /* Wait for dma_req to be cleared */ 1772 if (readl_poll_timeout_atomic(host->regs + SDMMC_STATUS, 1773 status, 1774 !(status & SDMMC_STATUS_DMA_REQ), 1775 1, 500 * USEC_PER_MSEC)) { 1776 dev_err(host->dev, 1777 "%s: Timeout waiting for dma_req to be cleared\n", 1778 __func__); 1779 goto ciu_out; 1780 } 1781 1782 /* when using DMA next we reset the fifo again */ 1783 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) 1784 goto ciu_out; 1785 } else { 1786 /* if the controller reset bit did clear, then set clock regs */ 1787 if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) { 1788 dev_err(host->dev, 1789 "%s: fifo/dma reset bits didn't clear but ciu was reset, doing clock update\n", 1790 __func__); 1791 goto ciu_out; 1792 } 1793 } 1794 1795 if (host->use_dma == TRANS_MODE_IDMAC) 1796 /* It is also required that we reinit idmac */ 1797 dw_mci_idmac_init(host); 1798 1799 ret = true; 1800 1801 ciu_out: 1802 /* After a CTRL reset we need to have CIU set clock registers */ 1803 mci_send_cmd(host->slot, SDMMC_CMD_UPD_CLK, 0); 1804 1805 return ret; 1806 } 1807 1808 static const struct mmc_host_ops dw_mci_ops = { 1809 .request = dw_mci_request, 1810 .pre_req = dw_mci_pre_req, 1811 .post_req = dw_mci_post_req, 1812 .set_ios = dw_mci_set_ios, 1813 .get_ro = dw_mci_get_ro, 1814 .get_cd = dw_mci_get_cd, 1815 .card_hw_reset = dw_mci_hw_reset, 1816 .enable_sdio_irq = dw_mci_enable_sdio_irq, 1817 .ack_sdio_irq = dw_mci_ack_sdio_irq, 1818 .execute_tuning = dw_mci_execute_tuning, 1819 .card_busy = dw_mci_card_busy, 1820 .start_signal_voltage_switch = dw_mci_switch_voltage, 1821 .prepare_hs400_tuning = dw_mci_prepare_hs400_tuning, 1822 }; 1823 1824 #ifdef CONFIG_FAULT_INJECTION 1825 static enum hrtimer_restart dw_mci_fault_timer(struct hrtimer *t) 1826 { 1827 struct dw_mci *host = container_of(t, struct dw_mci, fault_timer); 1828 unsigned long flags; 1829 1830 spin_lock_irqsave(&host->irq_lock, flags); 1831 1832 /* 1833 * Only inject an error if we haven't already got an error or data over 1834 * interrupt. 1835 */ 1836 if (!host->data_status) { 1837 host->data_status = SDMMC_INT_DCRC; 1838 set_bit(EVENT_DATA_ERROR, &host->pending_events); 1839 tasklet_schedule(&host->tasklet); 1840 } 1841 1842 spin_unlock_irqrestore(&host->irq_lock, flags); 1843 1844 return HRTIMER_NORESTART; 1845 } 1846 1847 static void dw_mci_start_fault_timer(struct dw_mci *host) 1848 { 1849 struct mmc_data *data = host->data; 1850 1851 if (!data || data->blocks <= 1) 1852 return; 1853 1854 if (!should_fail(&host->fail_data_crc, 1)) 1855 return; 1856 1857 /* 1858 * Try to inject the error at random points during the data transfer. 1859 */ 1860 hrtimer_start(&host->fault_timer, 1861 ms_to_ktime(prandom_u32() % 25), 1862 HRTIMER_MODE_REL); 1863 } 1864 1865 static void dw_mci_stop_fault_timer(struct dw_mci *host) 1866 { 1867 hrtimer_cancel(&host->fault_timer); 1868 } 1869 1870 static void dw_mci_init_fault(struct dw_mci *host) 1871 { 1872 host->fail_data_crc = (struct fault_attr) FAULT_ATTR_INITIALIZER; 1873 1874 hrtimer_init(&host->fault_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 1875 host->fault_timer.function = dw_mci_fault_timer; 1876 } 1877 #else 1878 static void dw_mci_init_fault(struct dw_mci *host) 1879 { 1880 } 1881 1882 static void dw_mci_start_fault_timer(struct dw_mci *host) 1883 { 1884 } 1885 1886 static void dw_mci_stop_fault_timer(struct dw_mci *host) 1887 { 1888 } 1889 #endif 1890 1891 static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq) 1892 __releases(&host->lock) 1893 __acquires(&host->lock) 1894 { 1895 struct dw_mci_slot *slot; 1896 struct mmc_host *prev_mmc = host->slot->mmc; 1897 1898 WARN_ON(host->cmd || host->data); 1899 1900 host->slot->mrq = NULL; 1901 host->mrq = NULL; 1902 if (!list_empty(&host->queue)) { 1903 slot = list_entry(host->queue.next, 1904 struct dw_mci_slot, queue_node); 1905 list_del(&slot->queue_node); 1906 dev_vdbg(host->dev, "list not empty: %s is next\n", 1907 mmc_hostname(slot->mmc)); 1908 host->state = STATE_SENDING_CMD; 1909 dw_mci_start_request(host, slot); 1910 } else { 1911 dev_vdbg(host->dev, "list empty\n"); 1912 1913 if (host->state == STATE_SENDING_CMD11) 1914 host->state = STATE_WAITING_CMD11_DONE; 1915 else 1916 host->state = STATE_IDLE; 1917 } 1918 1919 spin_unlock(&host->lock); 1920 mmc_request_done(prev_mmc, mrq); 1921 spin_lock(&host->lock); 1922 } 1923 1924 static int dw_mci_command_complete(struct dw_mci *host, struct mmc_command *cmd) 1925 { 1926 u32 status = host->cmd_status; 1927 1928 host->cmd_status = 0; 1929 1930 /* Read the response from the card (up to 16 bytes) */ 1931 if (cmd->flags & MMC_RSP_PRESENT) { 1932 if (cmd->flags & MMC_RSP_136) { 1933 cmd->resp[3] = mci_readl(host, RESP0); 1934 cmd->resp[2] = mci_readl(host, RESP1); 1935 cmd->resp[1] = mci_readl(host, RESP2); 1936 cmd->resp[0] = mci_readl(host, RESP3); 1937 } else { 1938 cmd->resp[0] = mci_readl(host, RESP0); 1939 cmd->resp[1] = 0; 1940 cmd->resp[2] = 0; 1941 cmd->resp[3] = 0; 1942 } 1943 } 1944 1945 if (status & SDMMC_INT_RTO) 1946 cmd->error = -ETIMEDOUT; 1947 else if ((cmd->flags & MMC_RSP_CRC) && (status & SDMMC_INT_RCRC)) 1948 cmd->error = -EILSEQ; 1949 else if (status & SDMMC_INT_RESP_ERR) 1950 cmd->error = -EIO; 1951 else 1952 cmd->error = 0; 1953 1954 return cmd->error; 1955 } 1956 1957 static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) 1958 { 1959 u32 status = host->data_status; 1960 1961 if (status & DW_MCI_DATA_ERROR_FLAGS) { 1962 if (status & SDMMC_INT_DRTO) { 1963 data->error = -ETIMEDOUT; 1964 } else if (status & SDMMC_INT_DCRC) { 1965 data->error = -EILSEQ; 1966 } else if (status & SDMMC_INT_EBE) { 1967 if (host->dir_status == 1968 DW_MCI_SEND_STATUS) { 1969 /* 1970 * No data CRC status was returned. 1971 * The number of bytes transferred 1972 * will be exaggerated in PIO mode. 1973 */ 1974 data->bytes_xfered = 0; 1975 data->error = -ETIMEDOUT; 1976 } else if (host->dir_status == 1977 DW_MCI_RECV_STATUS) { 1978 data->error = -EILSEQ; 1979 } 1980 } else { 1981 /* SDMMC_INT_SBE is included */ 1982 data->error = -EILSEQ; 1983 } 1984 1985 dev_dbg(host->dev, "data error, status 0x%08x\n", status); 1986 1987 /* 1988 * After an error, there may be data lingering 1989 * in the FIFO 1990 */ 1991 dw_mci_reset(host); 1992 } else { 1993 data->bytes_xfered = data->blocks * data->blksz; 1994 data->error = 0; 1995 } 1996 1997 return data->error; 1998 } 1999 2000 static void dw_mci_set_drto(struct dw_mci *host) 2001 { 2002 const struct dw_mci_drv_data *drv_data = host->drv_data; 2003 unsigned int drto_clks; 2004 unsigned int drto_div; 2005 unsigned int drto_ms; 2006 unsigned long irqflags; 2007 2008 if (drv_data && drv_data->get_drto_clks) 2009 drto_clks = drv_data->get_drto_clks(host); 2010 else 2011 drto_clks = mci_readl(host, TMOUT) >> 8; 2012 drto_div = (mci_readl(host, CLKDIV) & 0xff) * 2; 2013 if (drto_div == 0) 2014 drto_div = 1; 2015 2016 drto_ms = DIV_ROUND_UP_ULL((u64)MSEC_PER_SEC * drto_clks * drto_div, 2017 host->bus_hz); 2018 2019 dev_dbg(host->dev, "drto_ms: %u\n", drto_ms); 2020 2021 /* add a bit spare time */ 2022 drto_ms += 10; 2023 2024 spin_lock_irqsave(&host->irq_lock, irqflags); 2025 if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) 2026 mod_timer(&host->dto_timer, 2027 jiffies + msecs_to_jiffies(drto_ms)); 2028 spin_unlock_irqrestore(&host->irq_lock, irqflags); 2029 } 2030 2031 static bool dw_mci_clear_pending_cmd_complete(struct dw_mci *host) 2032 { 2033 if (!test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) 2034 return false; 2035 2036 /* 2037 * Really be certain that the timer has stopped. This is a bit of 2038 * paranoia and could only really happen if we had really bad 2039 * interrupt latency and the interrupt routine and timeout were 2040 * running concurrently so that the del_timer() in the interrupt 2041 * handler couldn't run. 2042 */ 2043 WARN_ON(del_timer_sync(&host->cto_timer)); 2044 clear_bit(EVENT_CMD_COMPLETE, &host->pending_events); 2045 2046 return true; 2047 } 2048 2049 static bool dw_mci_clear_pending_data_complete(struct dw_mci *host) 2050 { 2051 if (!test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) 2052 return false; 2053 2054 /* Extra paranoia just like dw_mci_clear_pending_cmd_complete() */ 2055 WARN_ON(del_timer_sync(&host->dto_timer)); 2056 clear_bit(EVENT_DATA_COMPLETE, &host->pending_events); 2057 2058 return true; 2059 } 2060 2061 static void dw_mci_tasklet_func(struct tasklet_struct *t) 2062 { 2063 struct dw_mci *host = from_tasklet(host, t, tasklet); 2064 struct mmc_data *data; 2065 struct mmc_command *cmd; 2066 struct mmc_request *mrq; 2067 enum dw_mci_state state; 2068 enum dw_mci_state prev_state; 2069 unsigned int err; 2070 2071 spin_lock(&host->lock); 2072 2073 state = host->state; 2074 data = host->data; 2075 mrq = host->mrq; 2076 2077 do { 2078 prev_state = state; 2079 2080 switch (state) { 2081 case STATE_IDLE: 2082 case STATE_WAITING_CMD11_DONE: 2083 break; 2084 2085 case STATE_SENDING_CMD11: 2086 case STATE_SENDING_CMD: 2087 if (!dw_mci_clear_pending_cmd_complete(host)) 2088 break; 2089 2090 cmd = host->cmd; 2091 host->cmd = NULL; 2092 set_bit(EVENT_CMD_COMPLETE, &host->completed_events); 2093 err = dw_mci_command_complete(host, cmd); 2094 if (cmd == mrq->sbc && !err) { 2095 __dw_mci_start_request(host, host->slot, 2096 mrq->cmd); 2097 goto unlock; 2098 } 2099 2100 if (cmd->data && err) { 2101 /* 2102 * During UHS tuning sequence, sending the stop 2103 * command after the response CRC error would 2104 * throw the system into a confused state 2105 * causing all future tuning phases to report 2106 * failure. 2107 * 2108 * In such case controller will move into a data 2109 * transfer state after a response error or 2110 * response CRC error. Let's let that finish 2111 * before trying to send a stop, so we'll go to 2112 * STATE_SENDING_DATA. 2113 * 2114 * Although letting the data transfer take place 2115 * will waste a bit of time (we already know 2116 * the command was bad), it can't cause any 2117 * errors since it's possible it would have 2118 * taken place anyway if this tasklet got 2119 * delayed. Allowing the transfer to take place 2120 * avoids races and keeps things simple. 2121 */ 2122 if (err != -ETIMEDOUT && 2123 host->dir_status == DW_MCI_RECV_STATUS) { 2124 state = STATE_SENDING_DATA; 2125 continue; 2126 } 2127 2128 send_stop_abort(host, data); 2129 dw_mci_stop_dma(host); 2130 state = STATE_SENDING_STOP; 2131 break; 2132 } 2133 2134 if (!cmd->data || err) { 2135 dw_mci_request_end(host, mrq); 2136 goto unlock; 2137 } 2138 2139 prev_state = state = STATE_SENDING_DATA; 2140 fallthrough; 2141 2142 case STATE_SENDING_DATA: 2143 /* 2144 * We could get a data error and never a transfer 2145 * complete so we'd better check for it here. 2146 * 2147 * Note that we don't really care if we also got a 2148 * transfer complete; stopping the DMA and sending an 2149 * abort won't hurt. 2150 */ 2151 if (test_and_clear_bit(EVENT_DATA_ERROR, 2152 &host->pending_events)) { 2153 if (!(host->data_status & (SDMMC_INT_DRTO | 2154 SDMMC_INT_EBE))) 2155 send_stop_abort(host, data); 2156 dw_mci_stop_dma(host); 2157 state = STATE_DATA_ERROR; 2158 break; 2159 } 2160 2161 if (!test_and_clear_bit(EVENT_XFER_COMPLETE, 2162 &host->pending_events)) { 2163 /* 2164 * If all data-related interrupts don't come 2165 * within the given time in reading data state. 2166 */ 2167 if (host->dir_status == DW_MCI_RECV_STATUS) 2168 dw_mci_set_drto(host); 2169 break; 2170 } 2171 2172 set_bit(EVENT_XFER_COMPLETE, &host->completed_events); 2173 2174 /* 2175 * Handle an EVENT_DATA_ERROR that might have shown up 2176 * before the transfer completed. This might not have 2177 * been caught by the check above because the interrupt 2178 * could have gone off between the previous check and 2179 * the check for transfer complete. 2180 * 2181 * Technically this ought not be needed assuming we 2182 * get a DATA_COMPLETE eventually (we'll notice the 2183 * error and end the request), but it shouldn't hurt. 2184 * 2185 * This has the advantage of sending the stop command. 2186 */ 2187 if (test_and_clear_bit(EVENT_DATA_ERROR, 2188 &host->pending_events)) { 2189 if (!(host->data_status & (SDMMC_INT_DRTO | 2190 SDMMC_INT_EBE))) 2191 send_stop_abort(host, data); 2192 dw_mci_stop_dma(host); 2193 state = STATE_DATA_ERROR; 2194 break; 2195 } 2196 prev_state = state = STATE_DATA_BUSY; 2197 2198 fallthrough; 2199 2200 case STATE_DATA_BUSY: 2201 if (!dw_mci_clear_pending_data_complete(host)) { 2202 /* 2203 * If data error interrupt comes but data over 2204 * interrupt doesn't come within the given time. 2205 * in reading data state. 2206 */ 2207 if (host->dir_status == DW_MCI_RECV_STATUS) 2208 dw_mci_set_drto(host); 2209 break; 2210 } 2211 2212 dw_mci_stop_fault_timer(host); 2213 host->data = NULL; 2214 set_bit(EVENT_DATA_COMPLETE, &host->completed_events); 2215 err = dw_mci_data_complete(host, data); 2216 2217 if (!err) { 2218 if (!data->stop || mrq->sbc) { 2219 if (mrq->sbc && data->stop) 2220 data->stop->error = 0; 2221 dw_mci_request_end(host, mrq); 2222 goto unlock; 2223 } 2224 2225 /* stop command for open-ended transfer*/ 2226 if (data->stop) 2227 send_stop_abort(host, data); 2228 } else { 2229 /* 2230 * If we don't have a command complete now we'll 2231 * never get one since we just reset everything; 2232 * better end the request. 2233 * 2234 * If we do have a command complete we'll fall 2235 * through to the SENDING_STOP command and 2236 * everything will be peachy keen. 2237 */ 2238 if (!test_bit(EVENT_CMD_COMPLETE, 2239 &host->pending_events)) { 2240 host->cmd = NULL; 2241 dw_mci_request_end(host, mrq); 2242 goto unlock; 2243 } 2244 } 2245 2246 /* 2247 * If err has non-zero, 2248 * stop-abort command has been already issued. 2249 */ 2250 prev_state = state = STATE_SENDING_STOP; 2251 2252 fallthrough; 2253 2254 case STATE_SENDING_STOP: 2255 if (!dw_mci_clear_pending_cmd_complete(host)) 2256 break; 2257 2258 /* CMD error in data command */ 2259 if (mrq->cmd->error && mrq->data) 2260 dw_mci_reset(host); 2261 2262 dw_mci_stop_fault_timer(host); 2263 host->cmd = NULL; 2264 host->data = NULL; 2265 2266 if (!mrq->sbc && mrq->stop) 2267 dw_mci_command_complete(host, mrq->stop); 2268 else 2269 host->cmd_status = 0; 2270 2271 dw_mci_request_end(host, mrq); 2272 goto unlock; 2273 2274 case STATE_DATA_ERROR: 2275 if (!test_and_clear_bit(EVENT_XFER_COMPLETE, 2276 &host->pending_events)) 2277 break; 2278 2279 state = STATE_DATA_BUSY; 2280 break; 2281 } 2282 } while (state != prev_state); 2283 2284 host->state = state; 2285 unlock: 2286 spin_unlock(&host->lock); 2287 2288 } 2289 2290 /* push final bytes to part_buf, only use during push */ 2291 static void dw_mci_set_part_bytes(struct dw_mci *host, void *buf, int cnt) 2292 { 2293 memcpy((void *)&host->part_buf, buf, cnt); 2294 host->part_buf_count = cnt; 2295 } 2296 2297 /* append bytes to part_buf, only use during push */ 2298 static int dw_mci_push_part_bytes(struct dw_mci *host, void *buf, int cnt) 2299 { 2300 cnt = min(cnt, (1 << host->data_shift) - host->part_buf_count); 2301 memcpy((void *)&host->part_buf + host->part_buf_count, buf, cnt); 2302 host->part_buf_count += cnt; 2303 return cnt; 2304 } 2305 2306 /* pull first bytes from part_buf, only use during pull */ 2307 static int dw_mci_pull_part_bytes(struct dw_mci *host, void *buf, int cnt) 2308 { 2309 cnt = min_t(int, cnt, host->part_buf_count); 2310 if (cnt) { 2311 memcpy(buf, (void *)&host->part_buf + host->part_buf_start, 2312 cnt); 2313 host->part_buf_count -= cnt; 2314 host->part_buf_start += cnt; 2315 } 2316 return cnt; 2317 } 2318 2319 /* pull final bytes from the part_buf, assuming it's just been filled */ 2320 static void dw_mci_pull_final_bytes(struct dw_mci *host, void *buf, int cnt) 2321 { 2322 memcpy(buf, &host->part_buf, cnt); 2323 host->part_buf_start = cnt; 2324 host->part_buf_count = (1 << host->data_shift) - cnt; 2325 } 2326 2327 static void dw_mci_push_data16(struct dw_mci *host, void *buf, int cnt) 2328 { 2329 struct mmc_data *data = host->data; 2330 int init_cnt = cnt; 2331 2332 /* try and push anything in the part_buf */ 2333 if (unlikely(host->part_buf_count)) { 2334 int len = dw_mci_push_part_bytes(host, buf, cnt); 2335 2336 buf += len; 2337 cnt -= len; 2338 if (host->part_buf_count == 2) { 2339 mci_fifo_writew(host->fifo_reg, host->part_buf16); 2340 host->part_buf_count = 0; 2341 } 2342 } 2343 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2344 if (unlikely((unsigned long)buf & 0x1)) { 2345 while (cnt >= 2) { 2346 u16 aligned_buf[64]; 2347 int len = min(cnt & -2, (int)sizeof(aligned_buf)); 2348 int items = len >> 1; 2349 int i; 2350 /* memcpy from input buffer into aligned buffer */ 2351 memcpy(aligned_buf, buf, len); 2352 buf += len; 2353 cnt -= len; 2354 /* push data from aligned buffer into fifo */ 2355 for (i = 0; i < items; ++i) 2356 mci_fifo_writew(host->fifo_reg, aligned_buf[i]); 2357 } 2358 } else 2359 #endif 2360 { 2361 u16 *pdata = buf; 2362 2363 for (; cnt >= 2; cnt -= 2) 2364 mci_fifo_writew(host->fifo_reg, *pdata++); 2365 buf = pdata; 2366 } 2367 /* put anything remaining in the part_buf */ 2368 if (cnt) { 2369 dw_mci_set_part_bytes(host, buf, cnt); 2370 /* Push data if we have reached the expected data length */ 2371 if ((data->bytes_xfered + init_cnt) == 2372 (data->blksz * data->blocks)) 2373 mci_fifo_writew(host->fifo_reg, host->part_buf16); 2374 } 2375 } 2376 2377 static void dw_mci_pull_data16(struct dw_mci *host, void *buf, int cnt) 2378 { 2379 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2380 if (unlikely((unsigned long)buf & 0x1)) { 2381 while (cnt >= 2) { 2382 /* pull data from fifo into aligned buffer */ 2383 u16 aligned_buf[64]; 2384 int len = min(cnt & -2, (int)sizeof(aligned_buf)); 2385 int items = len >> 1; 2386 int i; 2387 2388 for (i = 0; i < items; ++i) 2389 aligned_buf[i] = mci_fifo_readw(host->fifo_reg); 2390 /* memcpy from aligned buffer into output buffer */ 2391 memcpy(buf, aligned_buf, len); 2392 buf += len; 2393 cnt -= len; 2394 } 2395 } else 2396 #endif 2397 { 2398 u16 *pdata = buf; 2399 2400 for (; cnt >= 2; cnt -= 2) 2401 *pdata++ = mci_fifo_readw(host->fifo_reg); 2402 buf = pdata; 2403 } 2404 if (cnt) { 2405 host->part_buf16 = mci_fifo_readw(host->fifo_reg); 2406 dw_mci_pull_final_bytes(host, buf, cnt); 2407 } 2408 } 2409 2410 static void dw_mci_push_data32(struct dw_mci *host, void *buf, int cnt) 2411 { 2412 struct mmc_data *data = host->data; 2413 int init_cnt = cnt; 2414 2415 /* try and push anything in the part_buf */ 2416 if (unlikely(host->part_buf_count)) { 2417 int len = dw_mci_push_part_bytes(host, buf, cnt); 2418 2419 buf += len; 2420 cnt -= len; 2421 if (host->part_buf_count == 4) { 2422 mci_fifo_writel(host->fifo_reg, host->part_buf32); 2423 host->part_buf_count = 0; 2424 } 2425 } 2426 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2427 if (unlikely((unsigned long)buf & 0x3)) { 2428 while (cnt >= 4) { 2429 u32 aligned_buf[32]; 2430 int len = min(cnt & -4, (int)sizeof(aligned_buf)); 2431 int items = len >> 2; 2432 int i; 2433 /* memcpy from input buffer into aligned buffer */ 2434 memcpy(aligned_buf, buf, len); 2435 buf += len; 2436 cnt -= len; 2437 /* push data from aligned buffer into fifo */ 2438 for (i = 0; i < items; ++i) 2439 mci_fifo_writel(host->fifo_reg, aligned_buf[i]); 2440 } 2441 } else 2442 #endif 2443 { 2444 u32 *pdata = buf; 2445 2446 for (; cnt >= 4; cnt -= 4) 2447 mci_fifo_writel(host->fifo_reg, *pdata++); 2448 buf = pdata; 2449 } 2450 /* put anything remaining in the part_buf */ 2451 if (cnt) { 2452 dw_mci_set_part_bytes(host, buf, cnt); 2453 /* Push data if we have reached the expected data length */ 2454 if ((data->bytes_xfered + init_cnt) == 2455 (data->blksz * data->blocks)) 2456 mci_fifo_writel(host->fifo_reg, host->part_buf32); 2457 } 2458 } 2459 2460 static void dw_mci_pull_data32(struct dw_mci *host, void *buf, int cnt) 2461 { 2462 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2463 if (unlikely((unsigned long)buf & 0x3)) { 2464 while (cnt >= 4) { 2465 /* pull data from fifo into aligned buffer */ 2466 u32 aligned_buf[32]; 2467 int len = min(cnt & -4, (int)sizeof(aligned_buf)); 2468 int items = len >> 2; 2469 int i; 2470 2471 for (i = 0; i < items; ++i) 2472 aligned_buf[i] = mci_fifo_readl(host->fifo_reg); 2473 /* memcpy from aligned buffer into output buffer */ 2474 memcpy(buf, aligned_buf, len); 2475 buf += len; 2476 cnt -= len; 2477 } 2478 } else 2479 #endif 2480 { 2481 u32 *pdata = buf; 2482 2483 for (; cnt >= 4; cnt -= 4) 2484 *pdata++ = mci_fifo_readl(host->fifo_reg); 2485 buf = pdata; 2486 } 2487 if (cnt) { 2488 host->part_buf32 = mci_fifo_readl(host->fifo_reg); 2489 dw_mci_pull_final_bytes(host, buf, cnt); 2490 } 2491 } 2492 2493 static void dw_mci_push_data64(struct dw_mci *host, void *buf, int cnt) 2494 { 2495 struct mmc_data *data = host->data; 2496 int init_cnt = cnt; 2497 2498 /* try and push anything in the part_buf */ 2499 if (unlikely(host->part_buf_count)) { 2500 int len = dw_mci_push_part_bytes(host, buf, cnt); 2501 2502 buf += len; 2503 cnt -= len; 2504 2505 if (host->part_buf_count == 8) { 2506 mci_fifo_writeq(host->fifo_reg, host->part_buf); 2507 host->part_buf_count = 0; 2508 } 2509 } 2510 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2511 if (unlikely((unsigned long)buf & 0x7)) { 2512 while (cnt >= 8) { 2513 u64 aligned_buf[16]; 2514 int len = min(cnt & -8, (int)sizeof(aligned_buf)); 2515 int items = len >> 3; 2516 int i; 2517 /* memcpy from input buffer into aligned buffer */ 2518 memcpy(aligned_buf, buf, len); 2519 buf += len; 2520 cnt -= len; 2521 /* push data from aligned buffer into fifo */ 2522 for (i = 0; i < items; ++i) 2523 mci_fifo_writeq(host->fifo_reg, aligned_buf[i]); 2524 } 2525 } else 2526 #endif 2527 { 2528 u64 *pdata = buf; 2529 2530 for (; cnt >= 8; cnt -= 8) 2531 mci_fifo_writeq(host->fifo_reg, *pdata++); 2532 buf = pdata; 2533 } 2534 /* put anything remaining in the part_buf */ 2535 if (cnt) { 2536 dw_mci_set_part_bytes(host, buf, cnt); 2537 /* Push data if we have reached the expected data length */ 2538 if ((data->bytes_xfered + init_cnt) == 2539 (data->blksz * data->blocks)) 2540 mci_fifo_writeq(host->fifo_reg, host->part_buf); 2541 } 2542 } 2543 2544 static void dw_mci_pull_data64(struct dw_mci *host, void *buf, int cnt) 2545 { 2546 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS 2547 if (unlikely((unsigned long)buf & 0x7)) { 2548 while (cnt >= 8) { 2549 /* pull data from fifo into aligned buffer */ 2550 u64 aligned_buf[16]; 2551 int len = min(cnt & -8, (int)sizeof(aligned_buf)); 2552 int items = len >> 3; 2553 int i; 2554 2555 for (i = 0; i < items; ++i) 2556 aligned_buf[i] = mci_fifo_readq(host->fifo_reg); 2557 2558 /* memcpy from aligned buffer into output buffer */ 2559 memcpy(buf, aligned_buf, len); 2560 buf += len; 2561 cnt -= len; 2562 } 2563 } else 2564 #endif 2565 { 2566 u64 *pdata = buf; 2567 2568 for (; cnt >= 8; cnt -= 8) 2569 *pdata++ = mci_fifo_readq(host->fifo_reg); 2570 buf = pdata; 2571 } 2572 if (cnt) { 2573 host->part_buf = mci_fifo_readq(host->fifo_reg); 2574 dw_mci_pull_final_bytes(host, buf, cnt); 2575 } 2576 } 2577 2578 static void dw_mci_pull_data(struct dw_mci *host, void *buf, int cnt) 2579 { 2580 int len; 2581 2582 /* get remaining partial bytes */ 2583 len = dw_mci_pull_part_bytes(host, buf, cnt); 2584 if (unlikely(len == cnt)) 2585 return; 2586 buf += len; 2587 cnt -= len; 2588 2589 /* get the rest of the data */ 2590 host->pull_data(host, buf, cnt); 2591 } 2592 2593 static void dw_mci_read_data_pio(struct dw_mci *host, bool dto) 2594 { 2595 struct sg_mapping_iter *sg_miter = &host->sg_miter; 2596 void *buf; 2597 unsigned int offset; 2598 struct mmc_data *data = host->data; 2599 int shift = host->data_shift; 2600 u32 status; 2601 unsigned int len; 2602 unsigned int remain, fcnt; 2603 2604 do { 2605 if (!sg_miter_next(sg_miter)) 2606 goto done; 2607 2608 host->sg = sg_miter->piter.sg; 2609 buf = sg_miter->addr; 2610 remain = sg_miter->length; 2611 offset = 0; 2612 2613 do { 2614 fcnt = (SDMMC_GET_FCNT(mci_readl(host, STATUS)) 2615 << shift) + host->part_buf_count; 2616 len = min(remain, fcnt); 2617 if (!len) 2618 break; 2619 dw_mci_pull_data(host, (void *)(buf + offset), len); 2620 data->bytes_xfered += len; 2621 offset += len; 2622 remain -= len; 2623 } while (remain); 2624 2625 sg_miter->consumed = offset; 2626 status = mci_readl(host, MINTSTS); 2627 mci_writel(host, RINTSTS, SDMMC_INT_RXDR); 2628 /* if the RXDR is ready read again */ 2629 } while ((status & SDMMC_INT_RXDR) || 2630 (dto && SDMMC_GET_FCNT(mci_readl(host, STATUS)))); 2631 2632 if (!remain) { 2633 if (!sg_miter_next(sg_miter)) 2634 goto done; 2635 sg_miter->consumed = 0; 2636 } 2637 sg_miter_stop(sg_miter); 2638 return; 2639 2640 done: 2641 sg_miter_stop(sg_miter); 2642 host->sg = NULL; 2643 smp_wmb(); /* drain writebuffer */ 2644 set_bit(EVENT_XFER_COMPLETE, &host->pending_events); 2645 } 2646 2647 static void dw_mci_write_data_pio(struct dw_mci *host) 2648 { 2649 struct sg_mapping_iter *sg_miter = &host->sg_miter; 2650 void *buf; 2651 unsigned int offset; 2652 struct mmc_data *data = host->data; 2653 int shift = host->data_shift; 2654 u32 status; 2655 unsigned int len; 2656 unsigned int fifo_depth = host->fifo_depth; 2657 unsigned int remain, fcnt; 2658 2659 do { 2660 if (!sg_miter_next(sg_miter)) 2661 goto done; 2662 2663 host->sg = sg_miter->piter.sg; 2664 buf = sg_miter->addr; 2665 remain = sg_miter->length; 2666 offset = 0; 2667 2668 do { 2669 fcnt = ((fifo_depth - 2670 SDMMC_GET_FCNT(mci_readl(host, STATUS))) 2671 << shift) - host->part_buf_count; 2672 len = min(remain, fcnt); 2673 if (!len) 2674 break; 2675 host->push_data(host, (void *)(buf + offset), len); 2676 data->bytes_xfered += len; 2677 offset += len; 2678 remain -= len; 2679 } while (remain); 2680 2681 sg_miter->consumed = offset; 2682 status = mci_readl(host, MINTSTS); 2683 mci_writel(host, RINTSTS, SDMMC_INT_TXDR); 2684 } while (status & SDMMC_INT_TXDR); /* if TXDR write again */ 2685 2686 if (!remain) { 2687 if (!sg_miter_next(sg_miter)) 2688 goto done; 2689 sg_miter->consumed = 0; 2690 } 2691 sg_miter_stop(sg_miter); 2692 return; 2693 2694 done: 2695 sg_miter_stop(sg_miter); 2696 host->sg = NULL; 2697 smp_wmb(); /* drain writebuffer */ 2698 set_bit(EVENT_XFER_COMPLETE, &host->pending_events); 2699 } 2700 2701 static void dw_mci_cmd_interrupt(struct dw_mci *host, u32 status) 2702 { 2703 del_timer(&host->cto_timer); 2704 2705 if (!host->cmd_status) 2706 host->cmd_status = status; 2707 2708 smp_wmb(); /* drain writebuffer */ 2709 2710 set_bit(EVENT_CMD_COMPLETE, &host->pending_events); 2711 tasklet_schedule(&host->tasklet); 2712 2713 dw_mci_start_fault_timer(host); 2714 } 2715 2716 static void dw_mci_handle_cd(struct dw_mci *host) 2717 { 2718 struct dw_mci_slot *slot = host->slot; 2719 2720 mmc_detect_change(slot->mmc, 2721 msecs_to_jiffies(host->pdata->detect_delay_ms)); 2722 } 2723 2724 static irqreturn_t dw_mci_interrupt(int irq, void *dev_id) 2725 { 2726 struct dw_mci *host = dev_id; 2727 u32 pending; 2728 struct dw_mci_slot *slot = host->slot; 2729 2730 pending = mci_readl(host, MINTSTS); /* read-only mask reg */ 2731 2732 if (pending) { 2733 /* Check volt switch first, since it can look like an error */ 2734 if ((host->state == STATE_SENDING_CMD11) && 2735 (pending & SDMMC_INT_VOLT_SWITCH)) { 2736 mci_writel(host, RINTSTS, SDMMC_INT_VOLT_SWITCH); 2737 pending &= ~SDMMC_INT_VOLT_SWITCH; 2738 2739 /* 2740 * Hold the lock; we know cmd11_timer can't be kicked 2741 * off after the lock is released, so safe to delete. 2742 */ 2743 spin_lock(&host->irq_lock); 2744 dw_mci_cmd_interrupt(host, pending); 2745 spin_unlock(&host->irq_lock); 2746 2747 del_timer(&host->cmd11_timer); 2748 } 2749 2750 if (pending & DW_MCI_CMD_ERROR_FLAGS) { 2751 spin_lock(&host->irq_lock); 2752 2753 del_timer(&host->cto_timer); 2754 mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS); 2755 host->cmd_status = pending; 2756 smp_wmb(); /* drain writebuffer */ 2757 set_bit(EVENT_CMD_COMPLETE, &host->pending_events); 2758 2759 spin_unlock(&host->irq_lock); 2760 } 2761 2762 if (pending & DW_MCI_DATA_ERROR_FLAGS) { 2763 spin_lock(&host->irq_lock); 2764 2765 if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) 2766 del_timer(&host->dto_timer); 2767 2768 /* if there is an error report DATA_ERROR */ 2769 mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS); 2770 host->data_status = pending; 2771 smp_wmb(); /* drain writebuffer */ 2772 set_bit(EVENT_DATA_ERROR, &host->pending_events); 2773 2774 if (host->quirks & DW_MMC_QUIRK_EXTENDED_TMOUT) 2775 /* In case of error, we cannot expect a DTO */ 2776 set_bit(EVENT_DATA_COMPLETE, 2777 &host->pending_events); 2778 2779 tasklet_schedule(&host->tasklet); 2780 2781 spin_unlock(&host->irq_lock); 2782 } 2783 2784 if (pending & SDMMC_INT_DATA_OVER) { 2785 spin_lock(&host->irq_lock); 2786 2787 del_timer(&host->dto_timer); 2788 2789 mci_writel(host, RINTSTS, SDMMC_INT_DATA_OVER); 2790 if (!host->data_status) 2791 host->data_status = pending; 2792 smp_wmb(); /* drain writebuffer */ 2793 if (host->dir_status == DW_MCI_RECV_STATUS) { 2794 if (host->sg != NULL) 2795 dw_mci_read_data_pio(host, true); 2796 } 2797 set_bit(EVENT_DATA_COMPLETE, &host->pending_events); 2798 tasklet_schedule(&host->tasklet); 2799 2800 spin_unlock(&host->irq_lock); 2801 } 2802 2803 if (pending & SDMMC_INT_RXDR) { 2804 mci_writel(host, RINTSTS, SDMMC_INT_RXDR); 2805 if (host->dir_status == DW_MCI_RECV_STATUS && host->sg) 2806 dw_mci_read_data_pio(host, false); 2807 } 2808 2809 if (pending & SDMMC_INT_TXDR) { 2810 mci_writel(host, RINTSTS, SDMMC_INT_TXDR); 2811 if (host->dir_status == DW_MCI_SEND_STATUS && host->sg) 2812 dw_mci_write_data_pio(host); 2813 } 2814 2815 if (pending & SDMMC_INT_CMD_DONE) { 2816 spin_lock(&host->irq_lock); 2817 2818 mci_writel(host, RINTSTS, SDMMC_INT_CMD_DONE); 2819 dw_mci_cmd_interrupt(host, pending); 2820 2821 spin_unlock(&host->irq_lock); 2822 } 2823 2824 if (pending & SDMMC_INT_CD) { 2825 mci_writel(host, RINTSTS, SDMMC_INT_CD); 2826 dw_mci_handle_cd(host); 2827 } 2828 2829 if (pending & SDMMC_INT_SDIO(slot->sdio_id)) { 2830 mci_writel(host, RINTSTS, 2831 SDMMC_INT_SDIO(slot->sdio_id)); 2832 __dw_mci_enable_sdio_irq(slot, 0); 2833 sdio_signal_irq(slot->mmc); 2834 } 2835 2836 } 2837 2838 if (host->use_dma != TRANS_MODE_IDMAC) 2839 return IRQ_HANDLED; 2840 2841 /* Handle IDMA interrupts */ 2842 if (host->dma_64bit_address == 1) { 2843 pending = mci_readl(host, IDSTS64); 2844 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) { 2845 mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_TI | 2846 SDMMC_IDMAC_INT_RI); 2847 mci_writel(host, IDSTS64, SDMMC_IDMAC_INT_NI); 2848 if (!test_bit(EVENT_DATA_ERROR, &host->pending_events)) 2849 host->dma_ops->complete((void *)host); 2850 } 2851 } else { 2852 pending = mci_readl(host, IDSTS); 2853 if (pending & (SDMMC_IDMAC_INT_TI | SDMMC_IDMAC_INT_RI)) { 2854 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_TI | 2855 SDMMC_IDMAC_INT_RI); 2856 mci_writel(host, IDSTS, SDMMC_IDMAC_INT_NI); 2857 if (!test_bit(EVENT_DATA_ERROR, &host->pending_events)) 2858 host->dma_ops->complete((void *)host); 2859 } 2860 } 2861 2862 return IRQ_HANDLED; 2863 } 2864 2865 static int dw_mci_init_slot_caps(struct dw_mci_slot *slot) 2866 { 2867 struct dw_mci *host = slot->host; 2868 const struct dw_mci_drv_data *drv_data = host->drv_data; 2869 struct mmc_host *mmc = slot->mmc; 2870 int ctrl_id; 2871 2872 if (host->pdata->caps) 2873 mmc->caps = host->pdata->caps; 2874 2875 if (host->pdata->pm_caps) 2876 mmc->pm_caps = host->pdata->pm_caps; 2877 2878 if (drv_data) 2879 mmc->caps |= drv_data->common_caps; 2880 2881 if (host->dev->of_node) { 2882 ctrl_id = of_alias_get_id(host->dev->of_node, "mshc"); 2883 if (ctrl_id < 0) 2884 ctrl_id = 0; 2885 } else { 2886 ctrl_id = to_platform_device(host->dev)->id; 2887 } 2888 2889 if (drv_data && drv_data->caps) { 2890 if (ctrl_id >= drv_data->num_caps) { 2891 dev_err(host->dev, "invalid controller id %d\n", 2892 ctrl_id); 2893 return -EINVAL; 2894 } 2895 mmc->caps |= drv_data->caps[ctrl_id]; 2896 } 2897 2898 if (host->pdata->caps2) 2899 mmc->caps2 = host->pdata->caps2; 2900 2901 /* if host has set a minimum_freq, we should respect it */ 2902 if (host->minimum_speed) 2903 mmc->f_min = host->minimum_speed; 2904 else 2905 mmc->f_min = DW_MCI_FREQ_MIN; 2906 2907 if (!mmc->f_max) 2908 mmc->f_max = DW_MCI_FREQ_MAX; 2909 2910 /* Process SDIO IRQs through the sdio_irq_work. */ 2911 if (mmc->caps & MMC_CAP_SDIO_IRQ) 2912 mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD; 2913 2914 return 0; 2915 } 2916 2917 static int dw_mci_init_slot(struct dw_mci *host) 2918 { 2919 struct mmc_host *mmc; 2920 struct dw_mci_slot *slot; 2921 int ret; 2922 2923 mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev); 2924 if (!mmc) 2925 return -ENOMEM; 2926 2927 slot = mmc_priv(mmc); 2928 slot->id = 0; 2929 slot->sdio_id = host->sdio_id0 + slot->id; 2930 slot->mmc = mmc; 2931 slot->host = host; 2932 host->slot = slot; 2933 2934 mmc->ops = &dw_mci_ops; 2935 2936 /*if there are external regulators, get them*/ 2937 ret = mmc_regulator_get_supply(mmc); 2938 if (ret) 2939 goto err_host_allocated; 2940 2941 if (!mmc->ocr_avail) 2942 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 2943 2944 ret = mmc_of_parse(mmc); 2945 if (ret) 2946 goto err_host_allocated; 2947 2948 ret = dw_mci_init_slot_caps(slot); 2949 if (ret) 2950 goto err_host_allocated; 2951 2952 /* Useful defaults if platform data is unset. */ 2953 if (host->use_dma == TRANS_MODE_IDMAC) { 2954 mmc->max_segs = host->ring_size; 2955 mmc->max_blk_size = 65535; 2956 mmc->max_seg_size = 0x1000; 2957 mmc->max_req_size = mmc->max_seg_size * host->ring_size; 2958 mmc->max_blk_count = mmc->max_req_size / 512; 2959 } else if (host->use_dma == TRANS_MODE_EDMAC) { 2960 mmc->max_segs = 64; 2961 mmc->max_blk_size = 65535; 2962 mmc->max_blk_count = 65535; 2963 mmc->max_req_size = 2964 mmc->max_blk_size * mmc->max_blk_count; 2965 mmc->max_seg_size = mmc->max_req_size; 2966 } else { 2967 /* TRANS_MODE_PIO */ 2968 mmc->max_segs = 64; 2969 mmc->max_blk_size = 65535; /* BLKSIZ is 16 bits */ 2970 mmc->max_blk_count = 512; 2971 mmc->max_req_size = mmc->max_blk_size * 2972 mmc->max_blk_count; 2973 mmc->max_seg_size = mmc->max_req_size; 2974 } 2975 2976 dw_mci_get_cd(mmc); 2977 2978 ret = mmc_add_host(mmc); 2979 if (ret) 2980 goto err_host_allocated; 2981 2982 #if defined(CONFIG_DEBUG_FS) 2983 dw_mci_init_debugfs(slot); 2984 #endif 2985 2986 return 0; 2987 2988 err_host_allocated: 2989 mmc_free_host(mmc); 2990 return ret; 2991 } 2992 2993 static void dw_mci_cleanup_slot(struct dw_mci_slot *slot) 2994 { 2995 /* Debugfs stuff is cleaned up by mmc core */ 2996 mmc_remove_host(slot->mmc); 2997 slot->host->slot = NULL; 2998 mmc_free_host(slot->mmc); 2999 } 3000 3001 static void dw_mci_init_dma(struct dw_mci *host) 3002 { 3003 int addr_config; 3004 struct device *dev = host->dev; 3005 3006 /* 3007 * Check tansfer mode from HCON[17:16] 3008 * Clear the ambiguous description of dw_mmc databook: 3009 * 2b'00: No DMA Interface -> Actually means using Internal DMA block 3010 * 2b'01: DesignWare DMA Interface -> Synopsys DW-DMA block 3011 * 2b'10: Generic DMA Interface -> non-Synopsys generic DMA block 3012 * 2b'11: Non DW DMA Interface -> pio only 3013 * Compared to DesignWare DMA Interface, Generic DMA Interface has a 3014 * simpler request/acknowledge handshake mechanism and both of them 3015 * are regarded as external dma master for dw_mmc. 3016 */ 3017 host->use_dma = SDMMC_GET_TRANS_MODE(mci_readl(host, HCON)); 3018 if (host->use_dma == DMA_INTERFACE_IDMA) { 3019 host->use_dma = TRANS_MODE_IDMAC; 3020 } else if (host->use_dma == DMA_INTERFACE_DWDMA || 3021 host->use_dma == DMA_INTERFACE_GDMA) { 3022 host->use_dma = TRANS_MODE_EDMAC; 3023 } else { 3024 goto no_dma; 3025 } 3026 3027 /* Determine which DMA interface to use */ 3028 if (host->use_dma == TRANS_MODE_IDMAC) { 3029 /* 3030 * Check ADDR_CONFIG bit in HCON to find 3031 * IDMAC address bus width 3032 */ 3033 addr_config = SDMMC_GET_ADDR_CONFIG(mci_readl(host, HCON)); 3034 3035 if (addr_config == 1) { 3036 /* host supports IDMAC in 64-bit address mode */ 3037 host->dma_64bit_address = 1; 3038 dev_info(host->dev, 3039 "IDMAC supports 64-bit address mode.\n"); 3040 if (!dma_set_mask(host->dev, DMA_BIT_MASK(64))) 3041 dma_set_coherent_mask(host->dev, 3042 DMA_BIT_MASK(64)); 3043 } else { 3044 /* host supports IDMAC in 32-bit address mode */ 3045 host->dma_64bit_address = 0; 3046 dev_info(host->dev, 3047 "IDMAC supports 32-bit address mode.\n"); 3048 } 3049 3050 /* Alloc memory for sg translation */ 3051 host->sg_cpu = dmam_alloc_coherent(host->dev, 3052 DESC_RING_BUF_SZ, 3053 &host->sg_dma, GFP_KERNEL); 3054 if (!host->sg_cpu) { 3055 dev_err(host->dev, 3056 "%s: could not alloc DMA memory\n", 3057 __func__); 3058 goto no_dma; 3059 } 3060 3061 host->dma_ops = &dw_mci_idmac_ops; 3062 dev_info(host->dev, "Using internal DMA controller.\n"); 3063 } else { 3064 /* TRANS_MODE_EDMAC: check dma bindings again */ 3065 if ((device_property_string_array_count(dev, "dma-names") < 0) || 3066 !device_property_present(dev, "dmas")) { 3067 goto no_dma; 3068 } 3069 host->dma_ops = &dw_mci_edmac_ops; 3070 dev_info(host->dev, "Using external DMA controller.\n"); 3071 } 3072 3073 if (host->dma_ops->init && host->dma_ops->start && 3074 host->dma_ops->stop && host->dma_ops->cleanup) { 3075 if (host->dma_ops->init(host)) { 3076 dev_err(host->dev, "%s: Unable to initialize DMA Controller.\n", 3077 __func__); 3078 goto no_dma; 3079 } 3080 } else { 3081 dev_err(host->dev, "DMA initialization not found.\n"); 3082 goto no_dma; 3083 } 3084 3085 return; 3086 3087 no_dma: 3088 dev_info(host->dev, "Using PIO mode.\n"); 3089 host->use_dma = TRANS_MODE_PIO; 3090 } 3091 3092 static void dw_mci_cmd11_timer(struct timer_list *t) 3093 { 3094 struct dw_mci *host = from_timer(host, t, cmd11_timer); 3095 3096 if (host->state != STATE_SENDING_CMD11) { 3097 dev_warn(host->dev, "Unexpected CMD11 timeout\n"); 3098 return; 3099 } 3100 3101 host->cmd_status = SDMMC_INT_RTO; 3102 set_bit(EVENT_CMD_COMPLETE, &host->pending_events); 3103 tasklet_schedule(&host->tasklet); 3104 } 3105 3106 static void dw_mci_cto_timer(struct timer_list *t) 3107 { 3108 struct dw_mci *host = from_timer(host, t, cto_timer); 3109 unsigned long irqflags; 3110 u32 pending; 3111 3112 spin_lock_irqsave(&host->irq_lock, irqflags); 3113 3114 /* 3115 * If somehow we have very bad interrupt latency it's remotely possible 3116 * that the timer could fire while the interrupt is still pending or 3117 * while the interrupt is midway through running. Let's be paranoid 3118 * and detect those two cases. Note that this is paranoia is somewhat 3119 * justified because in this function we don't actually cancel the 3120 * pending command in the controller--we just assume it will never come. 3121 */ 3122 pending = mci_readl(host, MINTSTS); /* read-only mask reg */ 3123 if (pending & (DW_MCI_CMD_ERROR_FLAGS | SDMMC_INT_CMD_DONE)) { 3124 /* The interrupt should fire; no need to act but we can warn */ 3125 dev_warn(host->dev, "Unexpected interrupt latency\n"); 3126 goto exit; 3127 } 3128 if (test_bit(EVENT_CMD_COMPLETE, &host->pending_events)) { 3129 /* Presumably interrupt handler couldn't delete the timer */ 3130 dev_warn(host->dev, "CTO timeout when already completed\n"); 3131 goto exit; 3132 } 3133 3134 /* 3135 * Continued paranoia to make sure we're in the state we expect. 3136 * This paranoia isn't really justified but it seems good to be safe. 3137 */ 3138 switch (host->state) { 3139 case STATE_SENDING_CMD11: 3140 case STATE_SENDING_CMD: 3141 case STATE_SENDING_STOP: 3142 /* 3143 * If CMD_DONE interrupt does NOT come in sending command 3144 * state, we should notify the driver to terminate current 3145 * transfer and report a command timeout to the core. 3146 */ 3147 host->cmd_status = SDMMC_INT_RTO; 3148 set_bit(EVENT_CMD_COMPLETE, &host->pending_events); 3149 tasklet_schedule(&host->tasklet); 3150 break; 3151 default: 3152 dev_warn(host->dev, "Unexpected command timeout, state %d\n", 3153 host->state); 3154 break; 3155 } 3156 3157 exit: 3158 spin_unlock_irqrestore(&host->irq_lock, irqflags); 3159 } 3160 3161 static void dw_mci_dto_timer(struct timer_list *t) 3162 { 3163 struct dw_mci *host = from_timer(host, t, dto_timer); 3164 unsigned long irqflags; 3165 u32 pending; 3166 3167 spin_lock_irqsave(&host->irq_lock, irqflags); 3168 3169 /* 3170 * The DTO timer is much longer than the CTO timer, so it's even less 3171 * likely that we'll these cases, but it pays to be paranoid. 3172 */ 3173 pending = mci_readl(host, MINTSTS); /* read-only mask reg */ 3174 if (pending & SDMMC_INT_DATA_OVER) { 3175 /* The interrupt should fire; no need to act but we can warn */ 3176 dev_warn(host->dev, "Unexpected data interrupt latency\n"); 3177 goto exit; 3178 } 3179 if (test_bit(EVENT_DATA_COMPLETE, &host->pending_events)) { 3180 /* Presumably interrupt handler couldn't delete the timer */ 3181 dev_warn(host->dev, "DTO timeout when already completed\n"); 3182 goto exit; 3183 } 3184 3185 /* 3186 * Continued paranoia to make sure we're in the state we expect. 3187 * This paranoia isn't really justified but it seems good to be safe. 3188 */ 3189 switch (host->state) { 3190 case STATE_SENDING_DATA: 3191 case STATE_DATA_BUSY: 3192 /* 3193 * If DTO interrupt does NOT come in sending data state, 3194 * we should notify the driver to terminate current transfer 3195 * and report a data timeout to the core. 3196 */ 3197 host->data_status = SDMMC_INT_DRTO; 3198 set_bit(EVENT_DATA_ERROR, &host->pending_events); 3199 set_bit(EVENT_DATA_COMPLETE, &host->pending_events); 3200 tasklet_schedule(&host->tasklet); 3201 break; 3202 default: 3203 dev_warn(host->dev, "Unexpected data timeout, state %d\n", 3204 host->state); 3205 break; 3206 } 3207 3208 exit: 3209 spin_unlock_irqrestore(&host->irq_lock, irqflags); 3210 } 3211 3212 #ifdef CONFIG_OF 3213 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) 3214 { 3215 struct dw_mci_board *pdata; 3216 struct device *dev = host->dev; 3217 const struct dw_mci_drv_data *drv_data = host->drv_data; 3218 int ret; 3219 u32 clock_frequency; 3220 3221 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 3222 if (!pdata) 3223 return ERR_PTR(-ENOMEM); 3224 3225 /* find reset controller when exist */ 3226 pdata->rstc = devm_reset_control_get_optional_exclusive(dev, "reset"); 3227 if (IS_ERR(pdata->rstc)) 3228 return ERR_CAST(pdata->rstc); 3229 3230 if (device_property_read_u32(dev, "fifo-depth", &pdata->fifo_depth)) 3231 dev_info(dev, 3232 "fifo-depth property not found, using value of FIFOTH register as default\n"); 3233 3234 device_property_read_u32(dev, "card-detect-delay", 3235 &pdata->detect_delay_ms); 3236 3237 device_property_read_u32(dev, "data-addr", &host->data_addr_override); 3238 3239 if (device_property_present(dev, "fifo-watermark-aligned")) 3240 host->wm_aligned = true; 3241 3242 if (!device_property_read_u32(dev, "clock-frequency", &clock_frequency)) 3243 pdata->bus_hz = clock_frequency; 3244 3245 if (drv_data && drv_data->parse_dt) { 3246 ret = drv_data->parse_dt(host); 3247 if (ret) 3248 return ERR_PTR(ret); 3249 } 3250 3251 return pdata; 3252 } 3253 3254 #else /* CONFIG_OF */ 3255 static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) 3256 { 3257 return ERR_PTR(-EINVAL); 3258 } 3259 #endif /* CONFIG_OF */ 3260 3261 static void dw_mci_enable_cd(struct dw_mci *host) 3262 { 3263 unsigned long irqflags; 3264 u32 temp; 3265 3266 /* 3267 * No need for CD if all slots have a non-error GPIO 3268 * as well as broken card detection is found. 3269 */ 3270 if (host->slot->mmc->caps & MMC_CAP_NEEDS_POLL) 3271 return; 3272 3273 if (mmc_gpio_get_cd(host->slot->mmc) < 0) { 3274 spin_lock_irqsave(&host->irq_lock, irqflags); 3275 temp = mci_readl(host, INTMASK); 3276 temp |= SDMMC_INT_CD; 3277 mci_writel(host, INTMASK, temp); 3278 spin_unlock_irqrestore(&host->irq_lock, irqflags); 3279 } 3280 } 3281 3282 int dw_mci_probe(struct dw_mci *host) 3283 { 3284 const struct dw_mci_drv_data *drv_data = host->drv_data; 3285 int width, i, ret = 0; 3286 u32 fifo_size; 3287 3288 if (!host->pdata) { 3289 host->pdata = dw_mci_parse_dt(host); 3290 if (IS_ERR(host->pdata)) 3291 return dev_err_probe(host->dev, PTR_ERR(host->pdata), 3292 "platform data not available\n"); 3293 } 3294 3295 host->biu_clk = devm_clk_get(host->dev, "biu"); 3296 if (IS_ERR(host->biu_clk)) { 3297 dev_dbg(host->dev, "biu clock not available\n"); 3298 } else { 3299 ret = clk_prepare_enable(host->biu_clk); 3300 if (ret) { 3301 dev_err(host->dev, "failed to enable biu clock\n"); 3302 return ret; 3303 } 3304 } 3305 3306 host->ciu_clk = devm_clk_get(host->dev, "ciu"); 3307 if (IS_ERR(host->ciu_clk)) { 3308 dev_dbg(host->dev, "ciu clock not available\n"); 3309 host->bus_hz = host->pdata->bus_hz; 3310 } else { 3311 ret = clk_prepare_enable(host->ciu_clk); 3312 if (ret) { 3313 dev_err(host->dev, "failed to enable ciu clock\n"); 3314 goto err_clk_biu; 3315 } 3316 3317 if (host->pdata->bus_hz) { 3318 ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz); 3319 if (ret) 3320 dev_warn(host->dev, 3321 "Unable to set bus rate to %uHz\n", 3322 host->pdata->bus_hz); 3323 } 3324 host->bus_hz = clk_get_rate(host->ciu_clk); 3325 } 3326 3327 if (!host->bus_hz) { 3328 dev_err(host->dev, 3329 "Platform data must supply bus speed\n"); 3330 ret = -ENODEV; 3331 goto err_clk_ciu; 3332 } 3333 3334 if (host->pdata->rstc) { 3335 reset_control_assert(host->pdata->rstc); 3336 usleep_range(10, 50); 3337 reset_control_deassert(host->pdata->rstc); 3338 } 3339 3340 if (drv_data && drv_data->init) { 3341 ret = drv_data->init(host); 3342 if (ret) { 3343 dev_err(host->dev, 3344 "implementation specific init failed\n"); 3345 goto err_clk_ciu; 3346 } 3347 } 3348 3349 timer_setup(&host->cmd11_timer, dw_mci_cmd11_timer, 0); 3350 timer_setup(&host->cto_timer, dw_mci_cto_timer, 0); 3351 timer_setup(&host->dto_timer, dw_mci_dto_timer, 0); 3352 3353 spin_lock_init(&host->lock); 3354 spin_lock_init(&host->irq_lock); 3355 INIT_LIST_HEAD(&host->queue); 3356 3357 dw_mci_init_fault(host); 3358 3359 /* 3360 * Get the host data width - this assumes that HCON has been set with 3361 * the correct values. 3362 */ 3363 i = SDMMC_GET_HDATA_WIDTH(mci_readl(host, HCON)); 3364 if (!i) { 3365 host->push_data = dw_mci_push_data16; 3366 host->pull_data = dw_mci_pull_data16; 3367 width = 16; 3368 host->data_shift = 1; 3369 } else if (i == 2) { 3370 host->push_data = dw_mci_push_data64; 3371 host->pull_data = dw_mci_pull_data64; 3372 width = 64; 3373 host->data_shift = 3; 3374 } else { 3375 /* Check for a reserved value, and warn if it is */ 3376 WARN((i != 1), 3377 "HCON reports a reserved host data width!\n" 3378 "Defaulting to 32-bit access.\n"); 3379 host->push_data = dw_mci_push_data32; 3380 host->pull_data = dw_mci_pull_data32; 3381 width = 32; 3382 host->data_shift = 2; 3383 } 3384 3385 /* Reset all blocks */ 3386 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { 3387 ret = -ENODEV; 3388 goto err_clk_ciu; 3389 } 3390 3391 host->dma_ops = host->pdata->dma_ops; 3392 dw_mci_init_dma(host); 3393 3394 /* Clear the interrupts for the host controller */ 3395 mci_writel(host, RINTSTS, 0xFFFFFFFF); 3396 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ 3397 3398 /* Put in max timeout */ 3399 mci_writel(host, TMOUT, 0xFFFFFFFF); 3400 3401 /* 3402 * FIFO threshold settings RxMark = fifo_size / 2 - 1, 3403 * Tx Mark = fifo_size / 2 DMA Size = 8 3404 */ 3405 if (!host->pdata->fifo_depth) { 3406 /* 3407 * Power-on value of RX_WMark is FIFO_DEPTH-1, but this may 3408 * have been overwritten by the bootloader, just like we're 3409 * about to do, so if you know the value for your hardware, you 3410 * should put it in the platform data. 3411 */ 3412 fifo_size = mci_readl(host, FIFOTH); 3413 fifo_size = 1 + ((fifo_size >> 16) & 0xfff); 3414 } else { 3415 fifo_size = host->pdata->fifo_depth; 3416 } 3417 host->fifo_depth = fifo_size; 3418 host->fifoth_val = 3419 SDMMC_SET_FIFOTH(0x2, fifo_size / 2 - 1, fifo_size / 2); 3420 mci_writel(host, FIFOTH, host->fifoth_val); 3421 3422 /* disable clock to CIU */ 3423 mci_writel(host, CLKENA, 0); 3424 mci_writel(host, CLKSRC, 0); 3425 3426 /* 3427 * In 2.40a spec, Data offset is changed. 3428 * Need to check the version-id and set data-offset for DATA register. 3429 */ 3430 host->verid = SDMMC_GET_VERID(mci_readl(host, VERID)); 3431 dev_info(host->dev, "Version ID is %04x\n", host->verid); 3432 3433 if (host->data_addr_override) 3434 host->fifo_reg = host->regs + host->data_addr_override; 3435 else if (host->verid < DW_MMC_240A) 3436 host->fifo_reg = host->regs + DATA_OFFSET; 3437 else 3438 host->fifo_reg = host->regs + DATA_240A_OFFSET; 3439 3440 tasklet_setup(&host->tasklet, dw_mci_tasklet_func); 3441 ret = devm_request_irq(host->dev, host->irq, dw_mci_interrupt, 3442 host->irq_flags, "dw-mci", host); 3443 if (ret) 3444 goto err_dmaunmap; 3445 3446 /* 3447 * Enable interrupts for command done, data over, data empty, 3448 * receive ready and error such as transmit, receive timeout, crc error 3449 */ 3450 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | 3451 SDMMC_INT_TXDR | SDMMC_INT_RXDR | 3452 DW_MCI_ERROR_FLAGS); 3453 /* Enable mci interrupt */ 3454 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); 3455 3456 dev_info(host->dev, 3457 "DW MMC controller at irq %d,%d bit host data width,%u deep fifo\n", 3458 host->irq, width, fifo_size); 3459 3460 /* We need at least one slot to succeed */ 3461 ret = dw_mci_init_slot(host); 3462 if (ret) { 3463 dev_dbg(host->dev, "slot %d init failed\n", i); 3464 goto err_dmaunmap; 3465 } 3466 3467 /* Now that slots are all setup, we can enable card detect */ 3468 dw_mci_enable_cd(host); 3469 3470 return 0; 3471 3472 err_dmaunmap: 3473 if (host->use_dma && host->dma_ops->exit) 3474 host->dma_ops->exit(host); 3475 3476 reset_control_assert(host->pdata->rstc); 3477 3478 err_clk_ciu: 3479 clk_disable_unprepare(host->ciu_clk); 3480 3481 err_clk_biu: 3482 clk_disable_unprepare(host->biu_clk); 3483 3484 return ret; 3485 } 3486 EXPORT_SYMBOL(dw_mci_probe); 3487 3488 void dw_mci_remove(struct dw_mci *host) 3489 { 3490 dev_dbg(host->dev, "remove slot\n"); 3491 if (host->slot) 3492 dw_mci_cleanup_slot(host->slot); 3493 3494 mci_writel(host, RINTSTS, 0xFFFFFFFF); 3495 mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */ 3496 3497 /* disable clock to CIU */ 3498 mci_writel(host, CLKENA, 0); 3499 mci_writel(host, CLKSRC, 0); 3500 3501 if (host->use_dma && host->dma_ops->exit) 3502 host->dma_ops->exit(host); 3503 3504 reset_control_assert(host->pdata->rstc); 3505 3506 clk_disable_unprepare(host->ciu_clk); 3507 clk_disable_unprepare(host->biu_clk); 3508 } 3509 EXPORT_SYMBOL(dw_mci_remove); 3510 3511 3512 3513 #ifdef CONFIG_PM 3514 int dw_mci_runtime_suspend(struct device *dev) 3515 { 3516 struct dw_mci *host = dev_get_drvdata(dev); 3517 3518 if (host->use_dma && host->dma_ops->exit) 3519 host->dma_ops->exit(host); 3520 3521 clk_disable_unprepare(host->ciu_clk); 3522 3523 if (host->slot && 3524 (mmc_can_gpio_cd(host->slot->mmc) || 3525 !mmc_card_is_removable(host->slot->mmc))) 3526 clk_disable_unprepare(host->biu_clk); 3527 3528 return 0; 3529 } 3530 EXPORT_SYMBOL(dw_mci_runtime_suspend); 3531 3532 int dw_mci_runtime_resume(struct device *dev) 3533 { 3534 int ret = 0; 3535 struct dw_mci *host = dev_get_drvdata(dev); 3536 3537 if (host->slot && 3538 (mmc_can_gpio_cd(host->slot->mmc) || 3539 !mmc_card_is_removable(host->slot->mmc))) { 3540 ret = clk_prepare_enable(host->biu_clk); 3541 if (ret) 3542 return ret; 3543 } 3544 3545 ret = clk_prepare_enable(host->ciu_clk); 3546 if (ret) 3547 goto err; 3548 3549 if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) { 3550 clk_disable_unprepare(host->ciu_clk); 3551 ret = -ENODEV; 3552 goto err; 3553 } 3554 3555 if (host->use_dma && host->dma_ops->init) 3556 host->dma_ops->init(host); 3557 3558 /* 3559 * Restore the initial value at FIFOTH register 3560 * And Invalidate the prev_blksz with zero 3561 */ 3562 mci_writel(host, FIFOTH, host->fifoth_val); 3563 host->prev_blksz = 0; 3564 3565 /* Put in max timeout */ 3566 mci_writel(host, TMOUT, 0xFFFFFFFF); 3567 3568 mci_writel(host, RINTSTS, 0xFFFFFFFF); 3569 mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER | 3570 SDMMC_INT_TXDR | SDMMC_INT_RXDR | 3571 DW_MCI_ERROR_FLAGS); 3572 mci_writel(host, CTRL, SDMMC_CTRL_INT_ENABLE); 3573 3574 3575 if (host->slot && host->slot->mmc->pm_flags & MMC_PM_KEEP_POWER) 3576 dw_mci_set_ios(host->slot->mmc, &host->slot->mmc->ios); 3577 3578 /* Force setup bus to guarantee available clock output */ 3579 dw_mci_setup_bus(host->slot, true); 3580 3581 /* Re-enable SDIO interrupts. */ 3582 if (sdio_irq_claimed(host->slot->mmc)) 3583 __dw_mci_enable_sdio_irq(host->slot, 1); 3584 3585 /* Now that slots are all setup, we can enable card detect */ 3586 dw_mci_enable_cd(host); 3587 3588 return 0; 3589 3590 err: 3591 if (host->slot && 3592 (mmc_can_gpio_cd(host->slot->mmc) || 3593 !mmc_card_is_removable(host->slot->mmc))) 3594 clk_disable_unprepare(host->biu_clk); 3595 3596 return ret; 3597 } 3598 EXPORT_SYMBOL(dw_mci_runtime_resume); 3599 #endif /* CONFIG_PM */ 3600 3601 static int __init dw_mci_init(void) 3602 { 3603 pr_info("Synopsys Designware Multimedia Card Interface Driver\n"); 3604 return 0; 3605 } 3606 3607 static void __exit dw_mci_exit(void) 3608 { 3609 } 3610 3611 module_init(dw_mci_init); 3612 module_exit(dw_mci_exit); 3613 3614 MODULE_DESCRIPTION("DW Multimedia Card Interface driver"); 3615 MODULE_AUTHOR("NXP Semiconductor VietNam"); 3616 MODULE_AUTHOR("Imagination Technologies Ltd"); 3617 MODULE_LICENSE("GPL v2"); 3618