1 /* 2 * linux/drivers/mmc/host/mxcmmc.c - Freescale i.MX MMCI driver 3 * 4 * This is a driver for the SDHC controller found in Freescale MX2/MX3 5 * SoCs. It is basically the same hardware as found on MX1 (imxmmc.c). 6 * Unlike the hardware found on MX1, this hardware just works and does 7 * not need all the quirks found in imxmmc.c, hence the separate driver. 8 * 9 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> 10 * Copyright (C) 2006 Pavel Pisa, PiKRON <ppisa@pikron.com> 11 * 12 * derived from pxamci.c by Russell King 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License version 2 as 16 * published by the Free Software Foundation. 17 * 18 */ 19 20 #include <linux/module.h> 21 #include <linux/init.h> 22 #include <linux/ioport.h> 23 #include <linux/platform_device.h> 24 #include <linux/interrupt.h> 25 #include <linux/irq.h> 26 #include <linux/blkdev.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/mmc/host.h> 29 #include <linux/mmc/card.h> 30 #include <linux/delay.h> 31 #include <linux/clk.h> 32 #include <linux/io.h> 33 #include <linux/gpio.h> 34 #include <linux/regulator/consumer.h> 35 #include <linux/dmaengine.h> 36 #include <linux/types.h> 37 #include <linux/of.h> 38 #include <linux/of_device.h> 39 #include <linux/of_dma.h> 40 #include <linux/of_gpio.h> 41 #include <linux/mmc/slot-gpio.h> 42 43 #include <asm/dma.h> 44 #include <asm/irq.h> 45 #include <linux/platform_data/mmc-mxcmmc.h> 46 47 #include <linux/platform_data/dma-imx.h> 48 49 #define DRIVER_NAME "mxc-mmc" 50 #define MXCMCI_TIMEOUT_MS 10000 51 52 #define MMC_REG_STR_STP_CLK 0x00 53 #define MMC_REG_STATUS 0x04 54 #define MMC_REG_CLK_RATE 0x08 55 #define MMC_REG_CMD_DAT_CONT 0x0C 56 #define MMC_REG_RES_TO 0x10 57 #define MMC_REG_READ_TO 0x14 58 #define MMC_REG_BLK_LEN 0x18 59 #define MMC_REG_NOB 0x1C 60 #define MMC_REG_REV_NO 0x20 61 #define MMC_REG_INT_CNTR 0x24 62 #define MMC_REG_CMD 0x28 63 #define MMC_REG_ARG 0x2C 64 #define MMC_REG_RES_FIFO 0x34 65 #define MMC_REG_BUFFER_ACCESS 0x38 66 67 #define STR_STP_CLK_RESET (1 << 3) 68 #define STR_STP_CLK_START_CLK (1 << 1) 69 #define STR_STP_CLK_STOP_CLK (1 << 0) 70 71 #define STATUS_CARD_INSERTION (1 << 31) 72 #define STATUS_CARD_REMOVAL (1 << 30) 73 #define STATUS_YBUF_EMPTY (1 << 29) 74 #define STATUS_XBUF_EMPTY (1 << 28) 75 #define STATUS_YBUF_FULL (1 << 27) 76 #define STATUS_XBUF_FULL (1 << 26) 77 #define STATUS_BUF_UND_RUN (1 << 25) 78 #define STATUS_BUF_OVFL (1 << 24) 79 #define STATUS_SDIO_INT_ACTIVE (1 << 14) 80 #define STATUS_END_CMD_RESP (1 << 13) 81 #define STATUS_WRITE_OP_DONE (1 << 12) 82 #define STATUS_DATA_TRANS_DONE (1 << 11) 83 #define STATUS_READ_OP_DONE (1 << 11) 84 #define STATUS_WR_CRC_ERROR_CODE_MASK (3 << 10) 85 #define STATUS_CARD_BUS_CLK_RUN (1 << 8) 86 #define STATUS_BUF_READ_RDY (1 << 7) 87 #define STATUS_BUF_WRITE_RDY (1 << 6) 88 #define STATUS_RESP_CRC_ERR (1 << 5) 89 #define STATUS_CRC_READ_ERR (1 << 3) 90 #define STATUS_CRC_WRITE_ERR (1 << 2) 91 #define STATUS_TIME_OUT_RESP (1 << 1) 92 #define STATUS_TIME_OUT_READ (1 << 0) 93 #define STATUS_ERR_MASK 0x2f 94 95 #define CMD_DAT_CONT_CMD_RESP_LONG_OFF (1 << 12) 96 #define CMD_DAT_CONT_STOP_READWAIT (1 << 11) 97 #define CMD_DAT_CONT_START_READWAIT (1 << 10) 98 #define CMD_DAT_CONT_BUS_WIDTH_4 (2 << 8) 99 #define CMD_DAT_CONT_INIT (1 << 7) 100 #define CMD_DAT_CONT_WRITE (1 << 4) 101 #define CMD_DAT_CONT_DATA_ENABLE (1 << 3) 102 #define CMD_DAT_CONT_RESPONSE_48BIT_CRC (1 << 0) 103 #define CMD_DAT_CONT_RESPONSE_136BIT (2 << 0) 104 #define CMD_DAT_CONT_RESPONSE_48BIT (3 << 0) 105 106 #define INT_SDIO_INT_WKP_EN (1 << 18) 107 #define INT_CARD_INSERTION_WKP_EN (1 << 17) 108 #define INT_CARD_REMOVAL_WKP_EN (1 << 16) 109 #define INT_CARD_INSERTION_EN (1 << 15) 110 #define INT_CARD_REMOVAL_EN (1 << 14) 111 #define INT_SDIO_IRQ_EN (1 << 13) 112 #define INT_DAT0_EN (1 << 12) 113 #define INT_BUF_READ_EN (1 << 4) 114 #define INT_BUF_WRITE_EN (1 << 3) 115 #define INT_END_CMD_RES_EN (1 << 2) 116 #define INT_WRITE_OP_DONE_EN (1 << 1) 117 #define INT_READ_OP_EN (1 << 0) 118 119 enum mxcmci_type { 120 IMX21_MMC, 121 IMX31_MMC, 122 MPC512X_MMC, 123 }; 124 125 struct mxcmci_host { 126 struct mmc_host *mmc; 127 void __iomem *base; 128 dma_addr_t phys_base; 129 int detect_irq; 130 struct dma_chan *dma; 131 struct dma_async_tx_descriptor *desc; 132 int do_dma; 133 int default_irq_mask; 134 int use_sdio; 135 unsigned int power_mode; 136 struct imxmmc_platform_data *pdata; 137 138 struct mmc_request *req; 139 struct mmc_command *cmd; 140 struct mmc_data *data; 141 142 unsigned int datasize; 143 unsigned int dma_dir; 144 145 u16 rev_no; 146 unsigned int cmdat; 147 148 struct clk *clk_ipg; 149 struct clk *clk_per; 150 151 int clock; 152 153 struct work_struct datawork; 154 spinlock_t lock; 155 156 int burstlen; 157 int dmareq; 158 struct dma_slave_config dma_slave_config; 159 struct imx_dma_data dma_data; 160 161 struct timer_list watchdog; 162 enum mxcmci_type devtype; 163 }; 164 165 static const struct platform_device_id mxcmci_devtype[] = { 166 { 167 .name = "imx21-mmc", 168 .driver_data = IMX21_MMC, 169 }, { 170 .name = "imx31-mmc", 171 .driver_data = IMX31_MMC, 172 }, { 173 .name = "mpc512x-sdhc", 174 .driver_data = MPC512X_MMC, 175 }, { 176 /* sentinel */ 177 } 178 }; 179 MODULE_DEVICE_TABLE(platform, mxcmci_devtype); 180 181 static const struct of_device_id mxcmci_of_match[] = { 182 { 183 .compatible = "fsl,imx21-mmc", 184 .data = &mxcmci_devtype[IMX21_MMC], 185 }, { 186 .compatible = "fsl,imx31-mmc", 187 .data = &mxcmci_devtype[IMX31_MMC], 188 }, { 189 .compatible = "fsl,mpc5121-sdhc", 190 .data = &mxcmci_devtype[MPC512X_MMC], 191 }, { 192 /* sentinel */ 193 } 194 }; 195 MODULE_DEVICE_TABLE(of, mxcmci_of_match); 196 197 static inline int is_imx31_mmc(struct mxcmci_host *host) 198 { 199 return host->devtype == IMX31_MMC; 200 } 201 202 static inline int is_mpc512x_mmc(struct mxcmci_host *host) 203 { 204 return host->devtype == MPC512X_MMC; 205 } 206 207 static inline u32 mxcmci_readl(struct mxcmci_host *host, int reg) 208 { 209 if (IS_ENABLED(CONFIG_PPC_MPC512x)) 210 return ioread32be(host->base + reg); 211 else 212 return readl(host->base + reg); 213 } 214 215 static inline void mxcmci_writel(struct mxcmci_host *host, u32 val, int reg) 216 { 217 if (IS_ENABLED(CONFIG_PPC_MPC512x)) 218 iowrite32be(val, host->base + reg); 219 else 220 writel(val, host->base + reg); 221 } 222 223 static inline u16 mxcmci_readw(struct mxcmci_host *host, int reg) 224 { 225 if (IS_ENABLED(CONFIG_PPC_MPC512x)) 226 return ioread32be(host->base + reg); 227 else 228 return readw(host->base + reg); 229 } 230 231 static inline void mxcmci_writew(struct mxcmci_host *host, u16 val, int reg) 232 { 233 if (IS_ENABLED(CONFIG_PPC_MPC512x)) 234 iowrite32be(val, host->base + reg); 235 else 236 writew(val, host->base + reg); 237 } 238 239 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios); 240 241 static void mxcmci_set_power(struct mxcmci_host *host, unsigned int vdd) 242 { 243 if (!IS_ERR(host->mmc->supply.vmmc)) { 244 if (host->power_mode == MMC_POWER_UP) 245 mmc_regulator_set_ocr(host->mmc, 246 host->mmc->supply.vmmc, vdd); 247 else if (host->power_mode == MMC_POWER_OFF) 248 mmc_regulator_set_ocr(host->mmc, 249 host->mmc->supply.vmmc, 0); 250 } 251 252 if (host->pdata && host->pdata->setpower) 253 host->pdata->setpower(mmc_dev(host->mmc), vdd); 254 } 255 256 static inline int mxcmci_use_dma(struct mxcmci_host *host) 257 { 258 return host->do_dma; 259 } 260 261 static void mxcmci_softreset(struct mxcmci_host *host) 262 { 263 int i; 264 265 dev_dbg(mmc_dev(host->mmc), "mxcmci_softreset\n"); 266 267 /* reset sequence */ 268 mxcmci_writew(host, STR_STP_CLK_RESET, MMC_REG_STR_STP_CLK); 269 mxcmci_writew(host, STR_STP_CLK_RESET | STR_STP_CLK_START_CLK, 270 MMC_REG_STR_STP_CLK); 271 272 for (i = 0; i < 8; i++) 273 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK); 274 275 mxcmci_writew(host, 0xff, MMC_REG_RES_TO); 276 } 277 278 #if IS_ENABLED(CONFIG_PPC_MPC512x) 279 static inline void buffer_swap32(u32 *buf, int len) 280 { 281 int i; 282 283 for (i = 0; i < ((len + 3) / 4); i++) { 284 st_le32(buf, *buf); 285 buf++; 286 } 287 } 288 289 static void mxcmci_swap_buffers(struct mmc_data *data) 290 { 291 struct scatterlist *sg; 292 int i; 293 294 for_each_sg(data->sg, sg, data->sg_len, i) 295 buffer_swap32(sg_virt(sg), sg->length); 296 } 297 #else 298 static inline void mxcmci_swap_buffers(struct mmc_data *data) {} 299 #endif 300 301 static int mxcmci_setup_data(struct mxcmci_host *host, struct mmc_data *data) 302 { 303 unsigned int nob = data->blocks; 304 unsigned int blksz = data->blksz; 305 unsigned int datasize = nob * blksz; 306 struct scatterlist *sg; 307 enum dma_transfer_direction slave_dirn; 308 int i, nents; 309 310 if (data->flags & MMC_DATA_STREAM) 311 nob = 0xffff; 312 313 host->data = data; 314 data->bytes_xfered = 0; 315 316 mxcmci_writew(host, nob, MMC_REG_NOB); 317 mxcmci_writew(host, blksz, MMC_REG_BLK_LEN); 318 host->datasize = datasize; 319 320 if (!mxcmci_use_dma(host)) 321 return 0; 322 323 for_each_sg(data->sg, sg, data->sg_len, i) { 324 if (sg->offset & 3 || sg->length & 3 || sg->length < 512) { 325 host->do_dma = 0; 326 return 0; 327 } 328 } 329 330 if (data->flags & MMC_DATA_READ) { 331 host->dma_dir = DMA_FROM_DEVICE; 332 slave_dirn = DMA_DEV_TO_MEM; 333 } else { 334 host->dma_dir = DMA_TO_DEVICE; 335 slave_dirn = DMA_MEM_TO_DEV; 336 337 mxcmci_swap_buffers(data); 338 } 339 340 nents = dma_map_sg(host->dma->device->dev, data->sg, 341 data->sg_len, host->dma_dir); 342 if (nents != data->sg_len) 343 return -EINVAL; 344 345 host->desc = dmaengine_prep_slave_sg(host->dma, 346 data->sg, data->sg_len, slave_dirn, 347 DMA_PREP_INTERRUPT | DMA_CTRL_ACK); 348 349 if (!host->desc) { 350 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 351 host->dma_dir); 352 host->do_dma = 0; 353 return 0; /* Fall back to PIO */ 354 } 355 wmb(); 356 357 dmaengine_submit(host->desc); 358 dma_async_issue_pending(host->dma); 359 360 mod_timer(&host->watchdog, jiffies + msecs_to_jiffies(MXCMCI_TIMEOUT_MS)); 361 362 return 0; 363 } 364 365 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat); 366 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat); 367 368 static void mxcmci_dma_callback(void *data) 369 { 370 struct mxcmci_host *host = data; 371 u32 stat; 372 373 del_timer(&host->watchdog); 374 375 stat = mxcmci_readl(host, MMC_REG_STATUS); 376 mxcmci_writel(host, stat & ~STATUS_DATA_TRANS_DONE, MMC_REG_STATUS); 377 378 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 379 380 if (stat & STATUS_READ_OP_DONE) 381 mxcmci_writel(host, STATUS_READ_OP_DONE, MMC_REG_STATUS); 382 383 mxcmci_data_done(host, stat); 384 } 385 386 static int mxcmci_start_cmd(struct mxcmci_host *host, struct mmc_command *cmd, 387 unsigned int cmdat) 388 { 389 u32 int_cntr = host->default_irq_mask; 390 unsigned long flags; 391 392 WARN_ON(host->cmd != NULL); 393 host->cmd = cmd; 394 395 switch (mmc_resp_type(cmd)) { 396 case MMC_RSP_R1: /* short CRC, OPCODE */ 397 case MMC_RSP_R1B:/* short CRC, OPCODE, BUSY */ 398 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT_CRC; 399 break; 400 case MMC_RSP_R2: /* long 136 bit + CRC */ 401 cmdat |= CMD_DAT_CONT_RESPONSE_136BIT; 402 break; 403 case MMC_RSP_R3: /* short */ 404 cmdat |= CMD_DAT_CONT_RESPONSE_48BIT; 405 break; 406 case MMC_RSP_NONE: 407 break; 408 default: 409 dev_err(mmc_dev(host->mmc), "unhandled response type 0x%x\n", 410 mmc_resp_type(cmd)); 411 cmd->error = -EINVAL; 412 return -EINVAL; 413 } 414 415 int_cntr = INT_END_CMD_RES_EN; 416 417 if (mxcmci_use_dma(host)) { 418 if (host->dma_dir == DMA_FROM_DEVICE) { 419 host->desc->callback = mxcmci_dma_callback; 420 host->desc->callback_param = host; 421 } else { 422 int_cntr |= INT_WRITE_OP_DONE_EN; 423 } 424 } 425 426 spin_lock_irqsave(&host->lock, flags); 427 if (host->use_sdio) 428 int_cntr |= INT_SDIO_IRQ_EN; 429 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR); 430 spin_unlock_irqrestore(&host->lock, flags); 431 432 mxcmci_writew(host, cmd->opcode, MMC_REG_CMD); 433 mxcmci_writel(host, cmd->arg, MMC_REG_ARG); 434 mxcmci_writew(host, cmdat, MMC_REG_CMD_DAT_CONT); 435 436 return 0; 437 } 438 439 static void mxcmci_finish_request(struct mxcmci_host *host, 440 struct mmc_request *req) 441 { 442 u32 int_cntr = host->default_irq_mask; 443 unsigned long flags; 444 445 spin_lock_irqsave(&host->lock, flags); 446 if (host->use_sdio) 447 int_cntr |= INT_SDIO_IRQ_EN; 448 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR); 449 spin_unlock_irqrestore(&host->lock, flags); 450 451 host->req = NULL; 452 host->cmd = NULL; 453 host->data = NULL; 454 455 mmc_request_done(host->mmc, req); 456 } 457 458 static int mxcmci_finish_data(struct mxcmci_host *host, unsigned int stat) 459 { 460 struct mmc_data *data = host->data; 461 int data_error; 462 463 if (mxcmci_use_dma(host)) { 464 dma_unmap_sg(host->dma->device->dev, data->sg, data->sg_len, 465 host->dma_dir); 466 mxcmci_swap_buffers(data); 467 } 468 469 if (stat & STATUS_ERR_MASK) { 470 dev_dbg(mmc_dev(host->mmc), "request failed. status: 0x%08x\n", 471 stat); 472 if (stat & STATUS_CRC_READ_ERR) { 473 dev_err(mmc_dev(host->mmc), "%s: -EILSEQ\n", __func__); 474 data->error = -EILSEQ; 475 } else if (stat & STATUS_CRC_WRITE_ERR) { 476 u32 err_code = (stat >> 9) & 0x3; 477 if (err_code == 2) { /* No CRC response */ 478 dev_err(mmc_dev(host->mmc), 479 "%s: No CRC -ETIMEDOUT\n", __func__); 480 data->error = -ETIMEDOUT; 481 } else { 482 dev_err(mmc_dev(host->mmc), 483 "%s: -EILSEQ\n", __func__); 484 data->error = -EILSEQ; 485 } 486 } else if (stat & STATUS_TIME_OUT_READ) { 487 dev_err(mmc_dev(host->mmc), 488 "%s: read -ETIMEDOUT\n", __func__); 489 data->error = -ETIMEDOUT; 490 } else { 491 dev_err(mmc_dev(host->mmc), "%s: -EIO\n", __func__); 492 data->error = -EIO; 493 } 494 } else { 495 data->bytes_xfered = host->datasize; 496 } 497 498 data_error = data->error; 499 500 host->data = NULL; 501 502 return data_error; 503 } 504 505 static void mxcmci_read_response(struct mxcmci_host *host, unsigned int stat) 506 { 507 struct mmc_command *cmd = host->cmd; 508 int i; 509 u32 a, b, c; 510 511 if (!cmd) 512 return; 513 514 if (stat & STATUS_TIME_OUT_RESP) { 515 dev_dbg(mmc_dev(host->mmc), "CMD TIMEOUT\n"); 516 cmd->error = -ETIMEDOUT; 517 } else if (stat & STATUS_RESP_CRC_ERR && cmd->flags & MMC_RSP_CRC) { 518 dev_dbg(mmc_dev(host->mmc), "cmd crc error\n"); 519 cmd->error = -EILSEQ; 520 } 521 522 if (cmd->flags & MMC_RSP_PRESENT) { 523 if (cmd->flags & MMC_RSP_136) { 524 for (i = 0; i < 4; i++) { 525 a = mxcmci_readw(host, MMC_REG_RES_FIFO); 526 b = mxcmci_readw(host, MMC_REG_RES_FIFO); 527 cmd->resp[i] = a << 16 | b; 528 } 529 } else { 530 a = mxcmci_readw(host, MMC_REG_RES_FIFO); 531 b = mxcmci_readw(host, MMC_REG_RES_FIFO); 532 c = mxcmci_readw(host, MMC_REG_RES_FIFO); 533 cmd->resp[0] = a << 24 | b << 8 | c >> 8; 534 } 535 } 536 } 537 538 static int mxcmci_poll_status(struct mxcmci_host *host, u32 mask) 539 { 540 u32 stat; 541 unsigned long timeout = jiffies + HZ; 542 543 do { 544 stat = mxcmci_readl(host, MMC_REG_STATUS); 545 if (stat & STATUS_ERR_MASK) 546 return stat; 547 if (time_after(jiffies, timeout)) { 548 mxcmci_softreset(host); 549 mxcmci_set_clk_rate(host, host->clock); 550 return STATUS_TIME_OUT_READ; 551 } 552 if (stat & mask) 553 return 0; 554 cpu_relax(); 555 } while (1); 556 } 557 558 static int mxcmci_pull(struct mxcmci_host *host, void *_buf, int bytes) 559 { 560 unsigned int stat; 561 u32 *buf = _buf; 562 563 while (bytes > 3) { 564 stat = mxcmci_poll_status(host, 565 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 566 if (stat) 567 return stat; 568 *buf++ = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS)); 569 bytes -= 4; 570 } 571 572 if (bytes) { 573 u8 *b = (u8 *)buf; 574 u32 tmp; 575 576 stat = mxcmci_poll_status(host, 577 STATUS_BUF_READ_RDY | STATUS_READ_OP_DONE); 578 if (stat) 579 return stat; 580 tmp = cpu_to_le32(mxcmci_readl(host, MMC_REG_BUFFER_ACCESS)); 581 memcpy(b, &tmp, bytes); 582 } 583 584 return 0; 585 } 586 587 static int mxcmci_push(struct mxcmci_host *host, void *_buf, int bytes) 588 { 589 unsigned int stat; 590 u32 *buf = _buf; 591 592 while (bytes > 3) { 593 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 594 if (stat) 595 return stat; 596 mxcmci_writel(host, cpu_to_le32(*buf++), MMC_REG_BUFFER_ACCESS); 597 bytes -= 4; 598 } 599 600 if (bytes) { 601 u8 *b = (u8 *)buf; 602 u32 tmp; 603 604 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 605 if (stat) 606 return stat; 607 608 memcpy(&tmp, b, bytes); 609 mxcmci_writel(host, cpu_to_le32(tmp), MMC_REG_BUFFER_ACCESS); 610 } 611 612 stat = mxcmci_poll_status(host, STATUS_BUF_WRITE_RDY); 613 if (stat) 614 return stat; 615 616 return 0; 617 } 618 619 static int mxcmci_transfer_data(struct mxcmci_host *host) 620 { 621 struct mmc_data *data = host->req->data; 622 struct scatterlist *sg; 623 int stat, i; 624 625 host->data = data; 626 host->datasize = 0; 627 628 if (data->flags & MMC_DATA_READ) { 629 for_each_sg(data->sg, sg, data->sg_len, i) { 630 stat = mxcmci_pull(host, sg_virt(sg), sg->length); 631 if (stat) 632 return stat; 633 host->datasize += sg->length; 634 } 635 } else { 636 for_each_sg(data->sg, sg, data->sg_len, i) { 637 stat = mxcmci_push(host, sg_virt(sg), sg->length); 638 if (stat) 639 return stat; 640 host->datasize += sg->length; 641 } 642 stat = mxcmci_poll_status(host, STATUS_WRITE_OP_DONE); 643 if (stat) 644 return stat; 645 } 646 return 0; 647 } 648 649 static void mxcmci_datawork(struct work_struct *work) 650 { 651 struct mxcmci_host *host = container_of(work, struct mxcmci_host, 652 datawork); 653 int datastat = mxcmci_transfer_data(host); 654 655 mxcmci_writel(host, STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 656 MMC_REG_STATUS); 657 mxcmci_finish_data(host, datastat); 658 659 if (host->req->stop) { 660 if (mxcmci_start_cmd(host, host->req->stop, 0)) { 661 mxcmci_finish_request(host, host->req); 662 return; 663 } 664 } else { 665 mxcmci_finish_request(host, host->req); 666 } 667 } 668 669 static void mxcmci_data_done(struct mxcmci_host *host, unsigned int stat) 670 { 671 struct mmc_request *req; 672 int data_error; 673 unsigned long flags; 674 675 spin_lock_irqsave(&host->lock, flags); 676 677 if (!host->data) { 678 spin_unlock_irqrestore(&host->lock, flags); 679 return; 680 } 681 682 if (!host->req) { 683 spin_unlock_irqrestore(&host->lock, flags); 684 return; 685 } 686 687 req = host->req; 688 if (!req->stop) 689 host->req = NULL; /* we will handle finish req below */ 690 691 data_error = mxcmci_finish_data(host, stat); 692 693 spin_unlock_irqrestore(&host->lock, flags); 694 695 mxcmci_read_response(host, stat); 696 host->cmd = NULL; 697 698 if (req->stop) { 699 if (mxcmci_start_cmd(host, req->stop, 0)) { 700 mxcmci_finish_request(host, req); 701 return; 702 } 703 } else { 704 mxcmci_finish_request(host, req); 705 } 706 } 707 708 static void mxcmci_cmd_done(struct mxcmci_host *host, unsigned int stat) 709 { 710 mxcmci_read_response(host, stat); 711 host->cmd = NULL; 712 713 if (!host->data && host->req) { 714 mxcmci_finish_request(host, host->req); 715 return; 716 } 717 718 /* For the DMA case the DMA engine handles the data transfer 719 * automatically. For non DMA we have to do it ourselves. 720 * Don't do it in interrupt context though. 721 */ 722 if (!mxcmci_use_dma(host) && host->data) 723 schedule_work(&host->datawork); 724 725 } 726 727 static irqreturn_t mxcmci_irq(int irq, void *devid) 728 { 729 struct mxcmci_host *host = devid; 730 unsigned long flags; 731 bool sdio_irq; 732 u32 stat; 733 734 stat = mxcmci_readl(host, MMC_REG_STATUS); 735 mxcmci_writel(host, 736 stat & ~(STATUS_SDIO_INT_ACTIVE | STATUS_DATA_TRANS_DONE | 737 STATUS_WRITE_OP_DONE), 738 MMC_REG_STATUS); 739 740 dev_dbg(mmc_dev(host->mmc), "%s: 0x%08x\n", __func__, stat); 741 742 spin_lock_irqsave(&host->lock, flags); 743 sdio_irq = (stat & STATUS_SDIO_INT_ACTIVE) && host->use_sdio; 744 spin_unlock_irqrestore(&host->lock, flags); 745 746 if (mxcmci_use_dma(host) && 747 (stat & (STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE))) 748 mxcmci_writel(host, STATUS_READ_OP_DONE | STATUS_WRITE_OP_DONE, 749 MMC_REG_STATUS); 750 751 if (sdio_irq) { 752 mxcmci_writel(host, STATUS_SDIO_INT_ACTIVE, MMC_REG_STATUS); 753 mmc_signal_sdio_irq(host->mmc); 754 } 755 756 if (stat & STATUS_END_CMD_RESP) 757 mxcmci_cmd_done(host, stat); 758 759 if (mxcmci_use_dma(host) && 760 (stat & (STATUS_DATA_TRANS_DONE | STATUS_WRITE_OP_DONE))) { 761 del_timer(&host->watchdog); 762 mxcmci_data_done(host, stat); 763 } 764 765 if (host->default_irq_mask && 766 (stat & (STATUS_CARD_INSERTION | STATUS_CARD_REMOVAL))) 767 mmc_detect_change(host->mmc, msecs_to_jiffies(200)); 768 769 return IRQ_HANDLED; 770 } 771 772 static void mxcmci_request(struct mmc_host *mmc, struct mmc_request *req) 773 { 774 struct mxcmci_host *host = mmc_priv(mmc); 775 unsigned int cmdat = host->cmdat; 776 int error; 777 778 WARN_ON(host->req != NULL); 779 780 host->req = req; 781 host->cmdat &= ~CMD_DAT_CONT_INIT; 782 783 if (host->dma) 784 host->do_dma = 1; 785 786 if (req->data) { 787 error = mxcmci_setup_data(host, req->data); 788 if (error) { 789 req->cmd->error = error; 790 goto out; 791 } 792 793 794 cmdat |= CMD_DAT_CONT_DATA_ENABLE; 795 796 if (req->data->flags & MMC_DATA_WRITE) 797 cmdat |= CMD_DAT_CONT_WRITE; 798 } 799 800 error = mxcmci_start_cmd(host, req->cmd, cmdat); 801 802 out: 803 if (error) 804 mxcmci_finish_request(host, req); 805 } 806 807 static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios) 808 { 809 unsigned int divider; 810 int prescaler = 0; 811 unsigned int clk_in = clk_get_rate(host->clk_per); 812 813 while (prescaler <= 0x800) { 814 for (divider = 1; divider <= 0xF; divider++) { 815 int x; 816 817 x = (clk_in / (divider + 1)); 818 819 if (prescaler) 820 x /= (prescaler * 2); 821 822 if (x <= clk_ios) 823 break; 824 } 825 if (divider < 0x10) 826 break; 827 828 if (prescaler == 0) 829 prescaler = 1; 830 else 831 prescaler <<= 1; 832 } 833 834 mxcmci_writew(host, (prescaler << 4) | divider, MMC_REG_CLK_RATE); 835 836 dev_dbg(mmc_dev(host->mmc), "scaler: %d divider: %d in: %d out: %d\n", 837 prescaler, divider, clk_in, clk_ios); 838 } 839 840 static int mxcmci_setup_dma(struct mmc_host *mmc) 841 { 842 struct mxcmci_host *host = mmc_priv(mmc); 843 struct dma_slave_config *config = &host->dma_slave_config; 844 845 config->dst_addr = host->phys_base + MMC_REG_BUFFER_ACCESS; 846 config->src_addr = host->phys_base + MMC_REG_BUFFER_ACCESS; 847 config->dst_addr_width = 4; 848 config->src_addr_width = 4; 849 config->dst_maxburst = host->burstlen; 850 config->src_maxburst = host->burstlen; 851 config->device_fc = false; 852 853 return dmaengine_slave_config(host->dma, config); 854 } 855 856 static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 857 { 858 struct mxcmci_host *host = mmc_priv(mmc); 859 int burstlen, ret; 860 861 /* 862 * use burstlen of 64 (16 words) in 4 bit mode (--> reg value 0) 863 * use burstlen of 16 (4 words) in 1 bit mode (--> reg value 16) 864 */ 865 if (ios->bus_width == MMC_BUS_WIDTH_4) 866 burstlen = 16; 867 else 868 burstlen = 4; 869 870 if (mxcmci_use_dma(host) && burstlen != host->burstlen) { 871 host->burstlen = burstlen; 872 ret = mxcmci_setup_dma(mmc); 873 if (ret) { 874 dev_err(mmc_dev(host->mmc), 875 "failed to config DMA channel. Falling back to PIO\n"); 876 dma_release_channel(host->dma); 877 host->do_dma = 0; 878 host->dma = NULL; 879 } 880 } 881 882 if (ios->bus_width == MMC_BUS_WIDTH_4) 883 host->cmdat |= CMD_DAT_CONT_BUS_WIDTH_4; 884 else 885 host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4; 886 887 if (host->power_mode != ios->power_mode) { 888 host->power_mode = ios->power_mode; 889 mxcmci_set_power(host, ios->vdd); 890 891 if (ios->power_mode == MMC_POWER_ON) 892 host->cmdat |= CMD_DAT_CONT_INIT; 893 } 894 895 if (ios->clock) { 896 mxcmci_set_clk_rate(host, ios->clock); 897 mxcmci_writew(host, STR_STP_CLK_START_CLK, MMC_REG_STR_STP_CLK); 898 } else { 899 mxcmci_writew(host, STR_STP_CLK_STOP_CLK, MMC_REG_STR_STP_CLK); 900 } 901 902 host->clock = ios->clock; 903 } 904 905 static irqreturn_t mxcmci_detect_irq(int irq, void *data) 906 { 907 struct mmc_host *mmc = data; 908 909 dev_dbg(mmc_dev(mmc), "%s\n", __func__); 910 911 mmc_detect_change(mmc, msecs_to_jiffies(250)); 912 return IRQ_HANDLED; 913 } 914 915 static int mxcmci_get_ro(struct mmc_host *mmc) 916 { 917 struct mxcmci_host *host = mmc_priv(mmc); 918 919 if (host->pdata && host->pdata->get_ro) 920 return !!host->pdata->get_ro(mmc_dev(mmc)); 921 /* 922 * If board doesn't support read only detection (no mmc_gpio 923 * context or gpio is invalid), then let the mmc core decide 924 * what to do. 925 */ 926 return mmc_gpio_get_ro(mmc); 927 } 928 929 static void mxcmci_enable_sdio_irq(struct mmc_host *mmc, int enable) 930 { 931 struct mxcmci_host *host = mmc_priv(mmc); 932 unsigned long flags; 933 u32 int_cntr; 934 935 spin_lock_irqsave(&host->lock, flags); 936 host->use_sdio = enable; 937 int_cntr = mxcmci_readl(host, MMC_REG_INT_CNTR); 938 939 if (enable) 940 int_cntr |= INT_SDIO_IRQ_EN; 941 else 942 int_cntr &= ~INT_SDIO_IRQ_EN; 943 944 mxcmci_writel(host, int_cntr, MMC_REG_INT_CNTR); 945 spin_unlock_irqrestore(&host->lock, flags); 946 } 947 948 static void mxcmci_init_card(struct mmc_host *host, struct mmc_card *card) 949 { 950 struct mxcmci_host *mxcmci = mmc_priv(host); 951 952 /* 953 * MX3 SoCs have a silicon bug which corrupts CRC calculation of 954 * multi-block transfers when connected SDIO peripheral doesn't 955 * drive the BUSY line as required by the specs. 956 * One way to prevent this is to only allow 1-bit transfers. 957 */ 958 959 if (is_imx31_mmc(mxcmci) && card->type == MMC_TYPE_SDIO) 960 host->caps &= ~MMC_CAP_4_BIT_DATA; 961 else 962 host->caps |= MMC_CAP_4_BIT_DATA; 963 } 964 965 static bool filter(struct dma_chan *chan, void *param) 966 { 967 struct mxcmci_host *host = param; 968 969 if (!imx_dma_is_general_purpose(chan)) 970 return false; 971 972 chan->private = &host->dma_data; 973 974 return true; 975 } 976 977 static void mxcmci_watchdog(unsigned long data) 978 { 979 struct mmc_host *mmc = (struct mmc_host *)data; 980 struct mxcmci_host *host = mmc_priv(mmc); 981 struct mmc_request *req = host->req; 982 unsigned int stat = mxcmci_readl(host, MMC_REG_STATUS); 983 984 if (host->dma_dir == DMA_FROM_DEVICE) { 985 dmaengine_terminate_all(host->dma); 986 dev_err(mmc_dev(host->mmc), 987 "%s: read time out (status = 0x%08x)\n", 988 __func__, stat); 989 } else { 990 dev_err(mmc_dev(host->mmc), 991 "%s: write time out (status = 0x%08x)\n", 992 __func__, stat); 993 mxcmci_softreset(host); 994 } 995 996 /* Mark transfer as erroneus and inform the upper layers */ 997 998 if (host->data) 999 host->data->error = -ETIMEDOUT; 1000 host->req = NULL; 1001 host->cmd = NULL; 1002 host->data = NULL; 1003 mmc_request_done(host->mmc, req); 1004 } 1005 1006 static const struct mmc_host_ops mxcmci_ops = { 1007 .request = mxcmci_request, 1008 .set_ios = mxcmci_set_ios, 1009 .get_ro = mxcmci_get_ro, 1010 .enable_sdio_irq = mxcmci_enable_sdio_irq, 1011 .init_card = mxcmci_init_card, 1012 }; 1013 1014 static int mxcmci_probe(struct platform_device *pdev) 1015 { 1016 struct mmc_host *mmc; 1017 struct mxcmci_host *host; 1018 struct resource *res; 1019 int ret = 0, irq; 1020 bool dat3_card_detect = false; 1021 dma_cap_mask_t mask; 1022 const struct of_device_id *of_id; 1023 struct imxmmc_platform_data *pdata = pdev->dev.platform_data; 1024 1025 pr_info("i.MX/MPC512x SDHC driver\n"); 1026 1027 of_id = of_match_device(mxcmci_of_match, &pdev->dev); 1028 1029 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1030 irq = platform_get_irq(pdev, 0); 1031 if (irq < 0) 1032 return -EINVAL; 1033 1034 mmc = mmc_alloc_host(sizeof(*host), &pdev->dev); 1035 if (!mmc) 1036 return -ENOMEM; 1037 1038 host = mmc_priv(mmc); 1039 1040 host->base = devm_ioremap_resource(&pdev->dev, res); 1041 if (IS_ERR(host->base)) { 1042 ret = PTR_ERR(host->base); 1043 goto out_free; 1044 } 1045 1046 host->phys_base = res->start; 1047 1048 ret = mmc_of_parse(mmc); 1049 if (ret) 1050 goto out_free; 1051 mmc->ops = &mxcmci_ops; 1052 1053 /* For devicetree parsing, the bus width is read from devicetree */ 1054 if (pdata) 1055 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ; 1056 else 1057 mmc->caps |= MMC_CAP_SDIO_IRQ; 1058 1059 /* MMC core transfer sizes tunable parameters */ 1060 mmc->max_blk_size = 2048; 1061 mmc->max_blk_count = 65535; 1062 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count; 1063 mmc->max_seg_size = mmc->max_req_size; 1064 1065 if (of_id) { 1066 const struct platform_device_id *id_entry = of_id->data; 1067 host->devtype = id_entry->driver_data; 1068 } else { 1069 host->devtype = pdev->id_entry->driver_data; 1070 } 1071 1072 /* adjust max_segs after devtype detection */ 1073 if (!is_mpc512x_mmc(host)) 1074 mmc->max_segs = 64; 1075 1076 host->mmc = mmc; 1077 host->pdata = pdata; 1078 spin_lock_init(&host->lock); 1079 1080 if (pdata) 1081 dat3_card_detect = pdata->dat3_card_detect; 1082 else if (!(mmc->caps & MMC_CAP_NONREMOVABLE) 1083 && !of_property_read_bool(pdev->dev.of_node, "cd-gpios")) 1084 dat3_card_detect = true; 1085 1086 ret = mmc_regulator_get_supply(mmc); 1087 if (ret) { 1088 if (pdata && ret != -EPROBE_DEFER) 1089 mmc->ocr_avail = pdata->ocr_avail ? : 1090 MMC_VDD_32_33 | MMC_VDD_33_34; 1091 else 1092 goto out_free; 1093 } 1094 1095 if (dat3_card_detect) 1096 host->default_irq_mask = 1097 INT_CARD_INSERTION_EN | INT_CARD_REMOVAL_EN; 1098 else 1099 host->default_irq_mask = 0; 1100 1101 host->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 1102 if (IS_ERR(host->clk_ipg)) { 1103 ret = PTR_ERR(host->clk_ipg); 1104 goto out_free; 1105 } 1106 1107 host->clk_per = devm_clk_get(&pdev->dev, "per"); 1108 if (IS_ERR(host->clk_per)) { 1109 ret = PTR_ERR(host->clk_per); 1110 goto out_free; 1111 } 1112 1113 clk_prepare_enable(host->clk_per); 1114 clk_prepare_enable(host->clk_ipg); 1115 1116 mxcmci_softreset(host); 1117 1118 host->rev_no = mxcmci_readw(host, MMC_REG_REV_NO); 1119 if (host->rev_no != 0x400) { 1120 ret = -ENODEV; 1121 dev_err(mmc_dev(host->mmc), "wrong rev.no. 0x%08x. aborting.\n", 1122 host->rev_no); 1123 goto out_clk_put; 1124 } 1125 1126 mmc->f_min = clk_get_rate(host->clk_per) >> 16; 1127 mmc->f_max = clk_get_rate(host->clk_per) >> 1; 1128 1129 /* recommended in data sheet */ 1130 mxcmci_writew(host, 0x2db4, MMC_REG_READ_TO); 1131 1132 mxcmci_writel(host, host->default_irq_mask, MMC_REG_INT_CNTR); 1133 1134 if (!host->pdata) { 1135 host->dma = dma_request_slave_channel(&pdev->dev, "rx-tx"); 1136 } else { 1137 res = platform_get_resource(pdev, IORESOURCE_DMA, 0); 1138 if (res) { 1139 host->dmareq = res->start; 1140 host->dma_data.peripheral_type = IMX_DMATYPE_SDHC; 1141 host->dma_data.priority = DMA_PRIO_LOW; 1142 host->dma_data.dma_request = host->dmareq; 1143 dma_cap_zero(mask); 1144 dma_cap_set(DMA_SLAVE, mask); 1145 host->dma = dma_request_channel(mask, filter, host); 1146 } 1147 } 1148 if (host->dma) 1149 mmc->max_seg_size = dma_get_max_seg_size( 1150 host->dma->device->dev); 1151 else 1152 dev_info(mmc_dev(host->mmc), "dma not available. Using PIO\n"); 1153 1154 INIT_WORK(&host->datawork, mxcmci_datawork); 1155 1156 ret = devm_request_irq(&pdev->dev, irq, mxcmci_irq, 0, 1157 dev_name(&pdev->dev), host); 1158 if (ret) 1159 goto out_free_dma; 1160 1161 platform_set_drvdata(pdev, mmc); 1162 1163 if (host->pdata && host->pdata->init) { 1164 ret = host->pdata->init(&pdev->dev, mxcmci_detect_irq, 1165 host->mmc); 1166 if (ret) 1167 goto out_free_dma; 1168 } 1169 1170 init_timer(&host->watchdog); 1171 host->watchdog.function = &mxcmci_watchdog; 1172 host->watchdog.data = (unsigned long)mmc; 1173 1174 mmc_add_host(mmc); 1175 1176 return 0; 1177 1178 out_free_dma: 1179 if (host->dma) 1180 dma_release_channel(host->dma); 1181 1182 out_clk_put: 1183 clk_disable_unprepare(host->clk_per); 1184 clk_disable_unprepare(host->clk_ipg); 1185 1186 out_free: 1187 mmc_free_host(mmc); 1188 1189 return ret; 1190 } 1191 1192 static int mxcmci_remove(struct platform_device *pdev) 1193 { 1194 struct mmc_host *mmc = platform_get_drvdata(pdev); 1195 struct mxcmci_host *host = mmc_priv(mmc); 1196 1197 mmc_remove_host(mmc); 1198 1199 if (host->pdata && host->pdata->exit) 1200 host->pdata->exit(&pdev->dev, mmc); 1201 1202 if (host->dma) 1203 dma_release_channel(host->dma); 1204 1205 clk_disable_unprepare(host->clk_per); 1206 clk_disable_unprepare(host->clk_ipg); 1207 1208 mmc_free_host(mmc); 1209 1210 return 0; 1211 } 1212 1213 static int __maybe_unused mxcmci_suspend(struct device *dev) 1214 { 1215 struct mmc_host *mmc = dev_get_drvdata(dev); 1216 struct mxcmci_host *host = mmc_priv(mmc); 1217 1218 clk_disable_unprepare(host->clk_per); 1219 clk_disable_unprepare(host->clk_ipg); 1220 return 0; 1221 } 1222 1223 static int __maybe_unused mxcmci_resume(struct device *dev) 1224 { 1225 struct mmc_host *mmc = dev_get_drvdata(dev); 1226 struct mxcmci_host *host = mmc_priv(mmc); 1227 1228 clk_prepare_enable(host->clk_per); 1229 clk_prepare_enable(host->clk_ipg); 1230 return 0; 1231 } 1232 1233 static SIMPLE_DEV_PM_OPS(mxcmci_pm_ops, mxcmci_suspend, mxcmci_resume); 1234 1235 static struct platform_driver mxcmci_driver = { 1236 .probe = mxcmci_probe, 1237 .remove = mxcmci_remove, 1238 .id_table = mxcmci_devtype, 1239 .driver = { 1240 .name = DRIVER_NAME, 1241 .owner = THIS_MODULE, 1242 .pm = &mxcmci_pm_ops, 1243 .of_match_table = mxcmci_of_match, 1244 } 1245 }; 1246 1247 module_platform_driver(mxcmci_driver); 1248 1249 MODULE_DESCRIPTION("i.MX Multimedia Card Interface Driver"); 1250 MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1251 MODULE_LICENSE("GPL"); 1252 MODULE_ALIAS("platform:mxc-mmc"); 1253