1 /* 2 * WM8505/WM8650 SD/MMC Host Controller 3 * 4 * Copyright (C) 2010 Tony Prisk 5 * Copyright (C) 2008 WonderMedia Technologies, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation 10 */ 11 12 #include <linux/init.h> 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/ioport.h> 16 #include <linux/errno.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/delay.h> 19 #include <linux/io.h> 20 #include <linux/irq.h> 21 #include <linux/clk.h> 22 #include <linux/gpio.h> 23 24 #include <linux/of.h> 25 #include <linux/of_address.h> 26 #include <linux/of_irq.h> 27 #include <linux/of_device.h> 28 29 #include <linux/mmc/host.h> 30 #include <linux/mmc/mmc.h> 31 #include <linux/mmc/sd.h> 32 33 #include <asm/byteorder.h> 34 35 36 #define DRIVER_NAME "wmt-sdhc" 37 38 39 /* MMC/SD controller registers */ 40 #define SDMMC_CTLR 0x00 41 #define SDMMC_CMD 0x01 42 #define SDMMC_RSPTYPE 0x02 43 #define SDMMC_ARG 0x04 44 #define SDMMC_BUSMODE 0x08 45 #define SDMMC_BLKLEN 0x0C 46 #define SDMMC_BLKCNT 0x0E 47 #define SDMMC_RSP 0x10 48 #define SDMMC_CBCR 0x20 49 #define SDMMC_INTMASK0 0x24 50 #define SDMMC_INTMASK1 0x25 51 #define SDMMC_STS0 0x28 52 #define SDMMC_STS1 0x29 53 #define SDMMC_STS2 0x2A 54 #define SDMMC_STS3 0x2B 55 #define SDMMC_RSPTIMEOUT 0x2C 56 #define SDMMC_CLK 0x30 /* VT8500 only */ 57 #define SDMMC_EXTCTRL 0x34 58 #define SDMMC_SBLKLEN 0x38 59 #define SDMMC_DMATIMEOUT 0x3C 60 61 62 /* SDMMC_CTLR bit fields */ 63 #define CTLR_CMD_START 0x01 64 #define CTLR_CMD_WRITE 0x04 65 #define CTLR_FIFO_RESET 0x08 66 67 /* SDMMC_BUSMODE bit fields */ 68 #define BM_SPI_MODE 0x01 69 #define BM_FOURBIT_MODE 0x02 70 #define BM_EIGHTBIT_MODE 0x04 71 #define BM_SD_OFF 0x10 72 #define BM_SPI_CS 0x20 73 #define BM_SD_POWER 0x40 74 #define BM_SOFT_RESET 0x80 75 76 /* SDMMC_BLKLEN bit fields */ 77 #define BLKL_CRCERR_ABORT 0x0800 78 #define BLKL_CD_POL_HIGH 0x1000 79 #define BLKL_GPI_CD 0x2000 80 #define BLKL_DATA3_CD 0x4000 81 #define BLKL_INT_ENABLE 0x8000 82 83 /* SDMMC_INTMASK0 bit fields */ 84 #define INT0_MBLK_TRAN_DONE_INT_EN 0x10 85 #define INT0_BLK_TRAN_DONE_INT_EN 0x20 86 #define INT0_CD_INT_EN 0x40 87 #define INT0_DI_INT_EN 0x80 88 89 /* SDMMC_INTMASK1 bit fields */ 90 #define INT1_CMD_RES_TRAN_DONE_INT_EN 0x02 91 #define INT1_CMD_RES_TOUT_INT_EN 0x04 92 #define INT1_MBLK_AUTO_STOP_INT_EN 0x08 93 #define INT1_DATA_TOUT_INT_EN 0x10 94 #define INT1_RESCRC_ERR_INT_EN 0x20 95 #define INT1_RCRC_ERR_INT_EN 0x40 96 #define INT1_WCRC_ERR_INT_EN 0x80 97 98 /* SDMMC_STS0 bit fields */ 99 #define STS0_WRITE_PROTECT 0x02 100 #define STS0_CD_DATA3 0x04 101 #define STS0_CD_GPI 0x08 102 #define STS0_MBLK_DONE 0x10 103 #define STS0_BLK_DONE 0x20 104 #define STS0_CARD_DETECT 0x40 105 #define STS0_DEVICE_INS 0x80 106 107 /* SDMMC_STS1 bit fields */ 108 #define STS1_SDIO_INT 0x01 109 #define STS1_CMDRSP_DONE 0x02 110 #define STS1_RSP_TIMEOUT 0x04 111 #define STS1_AUTOSTOP_DONE 0x08 112 #define STS1_DATA_TIMEOUT 0x10 113 #define STS1_RSP_CRC_ERR 0x20 114 #define STS1_RCRC_ERR 0x40 115 #define STS1_WCRC_ERR 0x80 116 117 /* SDMMC_STS2 bit fields */ 118 #define STS2_CMD_RES_BUSY 0x10 119 #define STS2_DATARSP_BUSY 0x20 120 #define STS2_DIS_FORCECLK 0x80 121 122 /* SDMMC_EXTCTRL bit fields */ 123 #define EXT_EIGHTBIT 0x04 124 125 /* MMC/SD DMA Controller Registers */ 126 #define SDDMA_GCR 0x100 127 #define SDDMA_IER 0x104 128 #define SDDMA_ISR 0x108 129 #define SDDMA_DESPR 0x10C 130 #define SDDMA_RBR 0x110 131 #define SDDMA_DAR 0x114 132 #define SDDMA_BAR 0x118 133 #define SDDMA_CPR 0x11C 134 #define SDDMA_CCR 0x120 135 136 137 /* SDDMA_GCR bit fields */ 138 #define DMA_GCR_DMA_EN 0x00000001 139 #define DMA_GCR_SOFT_RESET 0x00000100 140 141 /* SDDMA_IER bit fields */ 142 #define DMA_IER_INT_EN 0x00000001 143 144 /* SDDMA_ISR bit fields */ 145 #define DMA_ISR_INT_STS 0x00000001 146 147 /* SDDMA_RBR bit fields */ 148 #define DMA_RBR_FORMAT 0x40000000 149 #define DMA_RBR_END 0x80000000 150 151 /* SDDMA_CCR bit fields */ 152 #define DMA_CCR_RUN 0x00000080 153 #define DMA_CCR_IF_TO_PERIPHERAL 0x00000000 154 #define DMA_CCR_PERIPHERAL_TO_IF 0x00400000 155 156 /* SDDMA_CCR event status */ 157 #define DMA_CCR_EVT_NO_STATUS 0x00000000 158 #define DMA_CCR_EVT_UNDERRUN 0x00000001 159 #define DMA_CCR_EVT_OVERRUN 0x00000002 160 #define DMA_CCR_EVT_DESP_READ 0x00000003 161 #define DMA_CCR_EVT_DATA_RW 0x00000004 162 #define DMA_CCR_EVT_EARLY_END 0x00000005 163 #define DMA_CCR_EVT_SUCCESS 0x0000000F 164 165 #define PDMA_READ 0x00 166 #define PDMA_WRITE 0x01 167 168 #define WMT_SD_POWER_OFF 0 169 #define WMT_SD_POWER_ON 1 170 171 struct wmt_dma_descriptor { 172 u32 flags; 173 u32 data_buffer_addr; 174 u32 branch_addr; 175 u32 reserved1; 176 }; 177 178 struct wmt_mci_caps { 179 unsigned int f_min; 180 unsigned int f_max; 181 u32 ocr_avail; 182 u32 caps; 183 u32 max_seg_size; 184 u32 max_segs; 185 u32 max_blk_size; 186 }; 187 188 struct wmt_mci_priv { 189 struct mmc_host *mmc; 190 void __iomem *sdmmc_base; 191 192 int irq_regular; 193 int irq_dma; 194 195 void *dma_desc_buffer; 196 dma_addr_t dma_desc_device_addr; 197 198 struct completion cmdcomp; 199 struct completion datacomp; 200 201 struct completion *comp_cmd; 202 struct completion *comp_dma; 203 204 struct mmc_request *req; 205 struct mmc_command *cmd; 206 207 struct clk *clk_sdmmc; 208 struct device *dev; 209 210 u8 power_inverted; 211 u8 cd_inverted; 212 }; 213 214 static void wmt_set_sd_power(struct wmt_mci_priv *priv, int enable) 215 { 216 u32 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); 217 218 if (enable ^ priv->power_inverted) 219 reg_tmp &= ~BM_SD_OFF; 220 else 221 reg_tmp |= BM_SD_OFF; 222 223 writeb(reg_tmp, priv->sdmmc_base + SDMMC_BUSMODE); 224 } 225 226 static void wmt_mci_read_response(struct mmc_host *mmc) 227 { 228 struct wmt_mci_priv *priv; 229 int idx1, idx2; 230 u8 tmp_resp; 231 u32 response; 232 233 priv = mmc_priv(mmc); 234 235 for (idx1 = 0; idx1 < 4; idx1++) { 236 response = 0; 237 for (idx2 = 0; idx2 < 4; idx2++) { 238 if ((idx1 == 3) && (idx2 == 3)) 239 tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP); 240 else 241 tmp_resp = readb(priv->sdmmc_base + SDMMC_RSP + 242 (idx1*4) + idx2 + 1); 243 response |= (tmp_resp << (idx2 * 8)); 244 } 245 priv->cmd->resp[idx1] = cpu_to_be32(response); 246 } 247 } 248 249 static void wmt_mci_start_command(struct wmt_mci_priv *priv) 250 { 251 u32 reg_tmp; 252 253 reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); 254 writeb(reg_tmp | CTLR_CMD_START, priv->sdmmc_base + SDMMC_CTLR); 255 } 256 257 static int wmt_mci_send_command(struct mmc_host *mmc, u8 command, u8 cmdtype, 258 u32 arg, u8 rsptype) 259 { 260 struct wmt_mci_priv *priv; 261 u32 reg_tmp; 262 263 priv = mmc_priv(mmc); 264 265 /* write command, arg, resptype registers */ 266 writeb(command, priv->sdmmc_base + SDMMC_CMD); 267 writel(arg, priv->sdmmc_base + SDMMC_ARG); 268 writeb(rsptype, priv->sdmmc_base + SDMMC_RSPTYPE); 269 270 /* reset response FIFO */ 271 reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); 272 writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR); 273 274 /* ensure clock enabled - VT3465 */ 275 wmt_set_sd_power(priv, WMT_SD_POWER_ON); 276 277 /* clear status bits */ 278 writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); 279 writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); 280 writeb(0xFF, priv->sdmmc_base + SDMMC_STS2); 281 writeb(0xFF, priv->sdmmc_base + SDMMC_STS3); 282 283 /* set command type */ 284 reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); 285 writeb((reg_tmp & 0x0F) | (cmdtype << 4), 286 priv->sdmmc_base + SDMMC_CTLR); 287 288 return 0; 289 } 290 291 static void wmt_mci_disable_dma(struct wmt_mci_priv *priv) 292 { 293 writel(DMA_ISR_INT_STS, priv->sdmmc_base + SDDMA_ISR); 294 writel(0, priv->sdmmc_base + SDDMA_IER); 295 } 296 297 static void wmt_complete_data_request(struct wmt_mci_priv *priv) 298 { 299 struct mmc_request *req; 300 req = priv->req; 301 302 req->data->bytes_xfered = req->data->blksz * req->data->blocks; 303 304 /* unmap the DMA pages used for write data */ 305 if (req->data->flags & MMC_DATA_WRITE) 306 dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg, 307 req->data->sg_len, DMA_TO_DEVICE); 308 else 309 dma_unmap_sg(mmc_dev(priv->mmc), req->data->sg, 310 req->data->sg_len, DMA_FROM_DEVICE); 311 312 /* Check if the DMA ISR returned a data error */ 313 if ((req->cmd->error) || (req->data->error)) 314 mmc_request_done(priv->mmc, req); 315 else { 316 wmt_mci_read_response(priv->mmc); 317 if (!req->data->stop) { 318 /* single-block read/write requests end here */ 319 mmc_request_done(priv->mmc, req); 320 } else { 321 /* 322 * we change the priv->cmd variable so the response is 323 * stored in the stop struct rather than the original 324 * calling command struct 325 */ 326 priv->comp_cmd = &priv->cmdcomp; 327 init_completion(priv->comp_cmd); 328 priv->cmd = req->data->stop; 329 wmt_mci_send_command(priv->mmc, req->data->stop->opcode, 330 7, req->data->stop->arg, 9); 331 wmt_mci_start_command(priv); 332 } 333 } 334 } 335 336 static irqreturn_t wmt_mci_dma_isr(int irq_num, void *data) 337 { 338 struct wmt_mci_priv *priv; 339 340 int status; 341 342 priv = (struct wmt_mci_priv *)data; 343 344 status = readl(priv->sdmmc_base + SDDMA_CCR) & 0x0F; 345 346 if (status != DMA_CCR_EVT_SUCCESS) { 347 dev_err(priv->dev, "DMA Error: Status = %d\n", status); 348 priv->req->data->error = -ETIMEDOUT; 349 complete(priv->comp_dma); 350 return IRQ_HANDLED; 351 } 352 353 priv->req->data->error = 0; 354 355 wmt_mci_disable_dma(priv); 356 357 complete(priv->comp_dma); 358 359 if (priv->comp_cmd) { 360 if (completion_done(priv->comp_cmd)) { 361 /* 362 * if the command (regular) interrupt has already 363 * completed, finish off the request otherwise we wait 364 * for the command interrupt and finish from there. 365 */ 366 wmt_complete_data_request(priv); 367 } 368 } 369 370 return IRQ_HANDLED; 371 } 372 373 static irqreturn_t wmt_mci_regular_isr(int irq_num, void *data) 374 { 375 struct wmt_mci_priv *priv; 376 u32 status0; 377 u32 status1; 378 u32 status2; 379 u32 reg_tmp; 380 int cmd_done; 381 382 priv = (struct wmt_mci_priv *)data; 383 cmd_done = 0; 384 status0 = readb(priv->sdmmc_base + SDMMC_STS0); 385 status1 = readb(priv->sdmmc_base + SDMMC_STS1); 386 status2 = readb(priv->sdmmc_base + SDMMC_STS2); 387 388 /* Check for card insertion */ 389 reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0); 390 if ((reg_tmp & INT0_DI_INT_EN) && (status0 & STS0_DEVICE_INS)) { 391 mmc_detect_change(priv->mmc, 0); 392 if (priv->cmd) 393 priv->cmd->error = -ETIMEDOUT; 394 if (priv->comp_cmd) 395 complete(priv->comp_cmd); 396 if (priv->comp_dma) { 397 wmt_mci_disable_dma(priv); 398 complete(priv->comp_dma); 399 } 400 writeb(STS0_DEVICE_INS, priv->sdmmc_base + SDMMC_STS0); 401 return IRQ_HANDLED; 402 } 403 404 if ((!priv->req->data) || 405 ((priv->req->data->stop) && (priv->cmd == priv->req->data->stop))) { 406 /* handle non-data & stop_transmission requests */ 407 if (status1 & STS1_CMDRSP_DONE) { 408 priv->cmd->error = 0; 409 cmd_done = 1; 410 } else if ((status1 & STS1_RSP_TIMEOUT) || 411 (status1 & STS1_DATA_TIMEOUT)) { 412 priv->cmd->error = -ETIMEDOUT; 413 cmd_done = 1; 414 } 415 416 if (cmd_done) { 417 priv->comp_cmd = NULL; 418 419 if (!priv->cmd->error) 420 wmt_mci_read_response(priv->mmc); 421 422 priv->cmd = NULL; 423 424 mmc_request_done(priv->mmc, priv->req); 425 } 426 } else { 427 /* handle data requests */ 428 if (status1 & STS1_CMDRSP_DONE) { 429 if (priv->cmd) 430 priv->cmd->error = 0; 431 if (priv->comp_cmd) 432 complete(priv->comp_cmd); 433 } 434 435 if ((status1 & STS1_RSP_TIMEOUT) || 436 (status1 & STS1_DATA_TIMEOUT)) { 437 if (priv->cmd) 438 priv->cmd->error = -ETIMEDOUT; 439 if (priv->comp_cmd) 440 complete(priv->comp_cmd); 441 if (priv->comp_dma) { 442 wmt_mci_disable_dma(priv); 443 complete(priv->comp_dma); 444 } 445 } 446 447 if (priv->comp_dma) { 448 /* 449 * If the dma interrupt has already completed, finish 450 * off the request; otherwise we wait for the DMA 451 * interrupt and finish from there. 452 */ 453 if (completion_done(priv->comp_dma)) 454 wmt_complete_data_request(priv); 455 } 456 } 457 458 writeb(status0, priv->sdmmc_base + SDMMC_STS0); 459 writeb(status1, priv->sdmmc_base + SDMMC_STS1); 460 writeb(status2, priv->sdmmc_base + SDMMC_STS2); 461 462 return IRQ_HANDLED; 463 } 464 465 static void wmt_reset_hardware(struct mmc_host *mmc) 466 { 467 struct wmt_mci_priv *priv; 468 u32 reg_tmp; 469 470 priv = mmc_priv(mmc); 471 472 /* reset controller */ 473 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); 474 writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE); 475 476 /* reset response FIFO */ 477 reg_tmp = readb(priv->sdmmc_base + SDMMC_CTLR); 478 writeb(reg_tmp | CTLR_FIFO_RESET, priv->sdmmc_base + SDMMC_CTLR); 479 480 /* enable GPI pin to detect card */ 481 writew(BLKL_INT_ENABLE | BLKL_GPI_CD, priv->sdmmc_base + SDMMC_BLKLEN); 482 483 /* clear interrupt status */ 484 writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); 485 writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); 486 487 /* setup interrupts */ 488 writeb(INT0_CD_INT_EN | INT0_DI_INT_EN, priv->sdmmc_base + 489 SDMMC_INTMASK0); 490 writeb(INT1_DATA_TOUT_INT_EN | INT1_CMD_RES_TRAN_DONE_INT_EN | 491 INT1_CMD_RES_TOUT_INT_EN, priv->sdmmc_base + SDMMC_INTMASK1); 492 493 /* set the DMA timeout */ 494 writew(8191, priv->sdmmc_base + SDMMC_DMATIMEOUT); 495 496 /* auto clock freezing enable */ 497 reg_tmp = readb(priv->sdmmc_base + SDMMC_STS2); 498 writeb(reg_tmp | STS2_DIS_FORCECLK, priv->sdmmc_base + SDMMC_STS2); 499 500 /* set a default clock speed of 400Khz */ 501 clk_set_rate(priv->clk_sdmmc, 400000); 502 } 503 504 static int wmt_dma_init(struct mmc_host *mmc) 505 { 506 struct wmt_mci_priv *priv; 507 508 priv = mmc_priv(mmc); 509 510 writel(DMA_GCR_SOFT_RESET, priv->sdmmc_base + SDDMA_GCR); 511 writel(DMA_GCR_DMA_EN, priv->sdmmc_base + SDDMA_GCR); 512 if ((readl(priv->sdmmc_base + SDDMA_GCR) & DMA_GCR_DMA_EN) != 0) 513 return 0; 514 else 515 return 1; 516 } 517 518 static void wmt_dma_init_descriptor(struct wmt_dma_descriptor *desc, 519 u16 req_count, u32 buffer_addr, u32 branch_addr, int end) 520 { 521 desc->flags = 0x40000000 | req_count; 522 if (end) 523 desc->flags |= 0x80000000; 524 desc->data_buffer_addr = buffer_addr; 525 desc->branch_addr = branch_addr; 526 } 527 528 static void wmt_dma_config(struct mmc_host *mmc, u32 descaddr, u8 dir) 529 { 530 struct wmt_mci_priv *priv; 531 u32 reg_tmp; 532 533 priv = mmc_priv(mmc); 534 535 /* Enable DMA Interrupts */ 536 writel(DMA_IER_INT_EN, priv->sdmmc_base + SDDMA_IER); 537 538 /* Write DMA Descriptor Pointer Register */ 539 writel(descaddr, priv->sdmmc_base + SDDMA_DESPR); 540 541 writel(0x00, priv->sdmmc_base + SDDMA_CCR); 542 543 if (dir == PDMA_WRITE) { 544 reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); 545 writel(reg_tmp & DMA_CCR_IF_TO_PERIPHERAL, priv->sdmmc_base + 546 SDDMA_CCR); 547 } else { 548 reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); 549 writel(reg_tmp | DMA_CCR_PERIPHERAL_TO_IF, priv->sdmmc_base + 550 SDDMA_CCR); 551 } 552 } 553 554 static void wmt_dma_start(struct wmt_mci_priv *priv) 555 { 556 u32 reg_tmp; 557 558 reg_tmp = readl(priv->sdmmc_base + SDDMA_CCR); 559 writel(reg_tmp | DMA_CCR_RUN, priv->sdmmc_base + SDDMA_CCR); 560 } 561 562 static void wmt_mci_request(struct mmc_host *mmc, struct mmc_request *req) 563 { 564 struct wmt_mci_priv *priv; 565 struct wmt_dma_descriptor *desc; 566 u8 command; 567 u8 cmdtype; 568 u32 arg; 569 u8 rsptype; 570 u32 reg_tmp; 571 572 struct scatterlist *sg; 573 int i; 574 int sg_cnt; 575 int offset; 576 u32 dma_address; 577 int desc_cnt; 578 579 priv = mmc_priv(mmc); 580 priv->req = req; 581 582 /* 583 * Use the cmd variable to pass a pointer to the resp[] structure 584 * This is required on multi-block requests to pass the pointer to the 585 * stop command 586 */ 587 priv->cmd = req->cmd; 588 589 command = req->cmd->opcode; 590 arg = req->cmd->arg; 591 rsptype = mmc_resp_type(req->cmd); 592 cmdtype = 0; 593 594 /* rsptype=7 only valid for SPI commands - should be =2 for SD */ 595 if (rsptype == 7) 596 rsptype = 2; 597 /* rsptype=21 is R1B, convert for controller */ 598 if (rsptype == 21) 599 rsptype = 9; 600 601 if (!req->data) { 602 wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype); 603 wmt_mci_start_command(priv); 604 /* completion is now handled in the regular_isr() */ 605 } 606 if (req->data) { 607 priv->comp_cmd = &priv->cmdcomp; 608 init_completion(priv->comp_cmd); 609 610 wmt_dma_init(mmc); 611 612 /* set controller data length */ 613 reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); 614 writew((reg_tmp & 0xF800) | (req->data->blksz - 1), 615 priv->sdmmc_base + SDMMC_BLKLEN); 616 617 /* set controller block count */ 618 writew(req->data->blocks, priv->sdmmc_base + SDMMC_BLKCNT); 619 620 desc = (struct wmt_dma_descriptor *)priv->dma_desc_buffer; 621 622 if (req->data->flags & MMC_DATA_WRITE) { 623 sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg, 624 req->data->sg_len, DMA_TO_DEVICE); 625 cmdtype = 1; 626 if (req->data->blocks > 1) 627 cmdtype = 3; 628 } else { 629 sg_cnt = dma_map_sg(mmc_dev(mmc), req->data->sg, 630 req->data->sg_len, DMA_FROM_DEVICE); 631 cmdtype = 2; 632 if (req->data->blocks > 1) 633 cmdtype = 4; 634 } 635 636 dma_address = priv->dma_desc_device_addr + 16; 637 desc_cnt = 0; 638 639 for_each_sg(req->data->sg, sg, sg_cnt, i) { 640 offset = 0; 641 while (offset < sg_dma_len(sg)) { 642 wmt_dma_init_descriptor(desc, req->data->blksz, 643 sg_dma_address(sg)+offset, 644 dma_address, 0); 645 desc++; 646 desc_cnt++; 647 offset += req->data->blksz; 648 dma_address += 16; 649 if (desc_cnt == req->data->blocks) 650 break; 651 } 652 } 653 desc--; 654 desc->flags |= 0x80000000; 655 656 if (req->data->flags & MMC_DATA_WRITE) 657 wmt_dma_config(mmc, priv->dma_desc_device_addr, 658 PDMA_WRITE); 659 else 660 wmt_dma_config(mmc, priv->dma_desc_device_addr, 661 PDMA_READ); 662 663 wmt_mci_send_command(mmc, command, cmdtype, arg, rsptype); 664 665 priv->comp_dma = &priv->datacomp; 666 init_completion(priv->comp_dma); 667 668 wmt_dma_start(priv); 669 wmt_mci_start_command(priv); 670 } 671 } 672 673 static void wmt_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 674 { 675 struct wmt_mci_priv *priv; 676 u32 busmode, extctrl; 677 678 priv = mmc_priv(mmc); 679 680 if (ios->power_mode == MMC_POWER_UP) { 681 wmt_reset_hardware(mmc); 682 683 wmt_set_sd_power(priv, WMT_SD_POWER_ON); 684 } 685 if (ios->power_mode == MMC_POWER_OFF) 686 wmt_set_sd_power(priv, WMT_SD_POWER_OFF); 687 688 if (ios->clock != 0) 689 clk_set_rate(priv->clk_sdmmc, ios->clock); 690 691 busmode = readb(priv->sdmmc_base + SDMMC_BUSMODE); 692 extctrl = readb(priv->sdmmc_base + SDMMC_EXTCTRL); 693 694 busmode &= ~(BM_EIGHTBIT_MODE | BM_FOURBIT_MODE); 695 extctrl &= ~EXT_EIGHTBIT; 696 697 switch (ios->bus_width) { 698 case MMC_BUS_WIDTH_8: 699 busmode |= BM_EIGHTBIT_MODE; 700 extctrl |= EXT_EIGHTBIT; 701 break; 702 case MMC_BUS_WIDTH_4: 703 busmode |= BM_FOURBIT_MODE; 704 break; 705 case MMC_BUS_WIDTH_1: 706 break; 707 } 708 709 writeb(busmode, priv->sdmmc_base + SDMMC_BUSMODE); 710 writeb(extctrl, priv->sdmmc_base + SDMMC_EXTCTRL); 711 } 712 713 static int wmt_mci_get_ro(struct mmc_host *mmc) 714 { 715 struct wmt_mci_priv *priv = mmc_priv(mmc); 716 717 return !(readb(priv->sdmmc_base + SDMMC_STS0) & STS0_WRITE_PROTECT); 718 } 719 720 static int wmt_mci_get_cd(struct mmc_host *mmc) 721 { 722 struct wmt_mci_priv *priv = mmc_priv(mmc); 723 u32 cd = (readb(priv->sdmmc_base + SDMMC_STS0) & STS0_CD_GPI) >> 3; 724 725 return !(cd ^ priv->cd_inverted); 726 } 727 728 static struct mmc_host_ops wmt_mci_ops = { 729 .request = wmt_mci_request, 730 .set_ios = wmt_mci_set_ios, 731 .get_ro = wmt_mci_get_ro, 732 .get_cd = wmt_mci_get_cd, 733 }; 734 735 /* Controller capabilities */ 736 static struct wmt_mci_caps wm8505_caps = { 737 .f_min = 390425, 738 .f_max = 50000000, 739 .ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34, 740 .caps = MMC_CAP_4_BIT_DATA | MMC_CAP_MMC_HIGHSPEED | 741 MMC_CAP_SD_HIGHSPEED, 742 .max_seg_size = 65024, 743 .max_segs = 128, 744 .max_blk_size = 2048, 745 }; 746 747 static const struct of_device_id wmt_mci_dt_ids[] = { 748 { .compatible = "wm,wm8505-sdhc", .data = &wm8505_caps }, 749 { /* Sentinel */ }, 750 }; 751 752 static int wmt_mci_probe(struct platform_device *pdev) 753 { 754 struct mmc_host *mmc; 755 struct wmt_mci_priv *priv; 756 struct device_node *np = pdev->dev.of_node; 757 const struct of_device_id *of_id = 758 of_match_device(wmt_mci_dt_ids, &pdev->dev); 759 const struct wmt_mci_caps *wmt_caps; 760 int ret; 761 int regular_irq, dma_irq; 762 763 if (!of_id || !of_id->data) { 764 dev_err(&pdev->dev, "Controller capabilities data missing\n"); 765 return -EFAULT; 766 } 767 768 wmt_caps = of_id->data; 769 770 if (!np) { 771 dev_err(&pdev->dev, "Missing SDMMC description in devicetree\n"); 772 return -EFAULT; 773 } 774 775 regular_irq = irq_of_parse_and_map(np, 0); 776 dma_irq = irq_of_parse_and_map(np, 1); 777 778 if (!regular_irq || !dma_irq) { 779 dev_err(&pdev->dev, "Getting IRQs failed!\n"); 780 ret = -ENXIO; 781 goto fail1; 782 } 783 784 mmc = mmc_alloc_host(sizeof(struct wmt_mci_priv), &pdev->dev); 785 if (!mmc) { 786 dev_err(&pdev->dev, "Failed to allocate mmc_host\n"); 787 ret = -ENOMEM; 788 goto fail1; 789 } 790 791 mmc->ops = &wmt_mci_ops; 792 mmc->f_min = wmt_caps->f_min; 793 mmc->f_max = wmt_caps->f_max; 794 mmc->ocr_avail = wmt_caps->ocr_avail; 795 mmc->caps = wmt_caps->caps; 796 797 mmc->max_seg_size = wmt_caps->max_seg_size; 798 mmc->max_segs = wmt_caps->max_segs; 799 mmc->max_blk_size = wmt_caps->max_blk_size; 800 801 mmc->max_req_size = (16*512*mmc->max_segs); 802 mmc->max_blk_count = mmc->max_req_size / 512; 803 804 priv = mmc_priv(mmc); 805 priv->mmc = mmc; 806 priv->dev = &pdev->dev; 807 808 priv->power_inverted = 0; 809 priv->cd_inverted = 0; 810 811 if (of_get_property(np, "sdon-inverted", NULL)) 812 priv->power_inverted = 1; 813 if (of_get_property(np, "cd-inverted", NULL)) 814 priv->cd_inverted = 1; 815 816 priv->sdmmc_base = of_iomap(np, 0); 817 if (!priv->sdmmc_base) { 818 dev_err(&pdev->dev, "Failed to map IO space\n"); 819 ret = -ENOMEM; 820 goto fail2; 821 } 822 823 priv->irq_regular = regular_irq; 824 priv->irq_dma = dma_irq; 825 826 ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv); 827 if (ret) { 828 dev_err(&pdev->dev, "Register regular IRQ fail\n"); 829 goto fail3; 830 } 831 832 ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv); 833 if (ret) { 834 dev_err(&pdev->dev, "Register DMA IRQ fail\n"); 835 goto fail4; 836 } 837 838 /* alloc some DMA buffers for descriptors/transfers */ 839 priv->dma_desc_buffer = dma_alloc_coherent(&pdev->dev, 840 mmc->max_blk_count * 16, 841 &priv->dma_desc_device_addr, 842 GFP_KERNEL); 843 if (!priv->dma_desc_buffer) { 844 dev_err(&pdev->dev, "DMA alloc fail\n"); 845 ret = -EPERM; 846 goto fail5; 847 } 848 849 platform_set_drvdata(pdev, mmc); 850 851 priv->clk_sdmmc = of_clk_get(np, 0); 852 if (IS_ERR(priv->clk_sdmmc)) { 853 dev_err(&pdev->dev, "Error getting clock\n"); 854 ret = PTR_ERR(priv->clk_sdmmc); 855 goto fail5; 856 } 857 858 clk_prepare_enable(priv->clk_sdmmc); 859 860 /* configure the controller to a known 'ready' state */ 861 wmt_reset_hardware(mmc); 862 863 mmc_add_host(mmc); 864 865 dev_info(&pdev->dev, "WMT SDHC Controller initialized\n"); 866 867 return 0; 868 fail5: 869 free_irq(dma_irq, priv); 870 fail4: 871 free_irq(regular_irq, priv); 872 fail3: 873 iounmap(priv->sdmmc_base); 874 fail2: 875 mmc_free_host(mmc); 876 fail1: 877 return ret; 878 } 879 880 static int wmt_mci_remove(struct platform_device *pdev) 881 { 882 struct mmc_host *mmc; 883 struct wmt_mci_priv *priv; 884 struct resource *res; 885 u32 reg_tmp; 886 887 mmc = platform_get_drvdata(pdev); 888 priv = mmc_priv(mmc); 889 890 /* reset SD controller */ 891 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); 892 writel(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + SDMMC_BUSMODE); 893 reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); 894 writew(reg_tmp & ~(0xA000), priv->sdmmc_base + SDMMC_BLKLEN); 895 writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); 896 writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); 897 898 /* release the dma buffers */ 899 dma_free_coherent(&pdev->dev, priv->mmc->max_blk_count * 16, 900 priv->dma_desc_buffer, priv->dma_desc_device_addr); 901 902 mmc_remove_host(mmc); 903 904 free_irq(priv->irq_regular, priv); 905 free_irq(priv->irq_dma, priv); 906 907 iounmap(priv->sdmmc_base); 908 909 clk_disable_unprepare(priv->clk_sdmmc); 910 clk_put(priv->clk_sdmmc); 911 912 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 913 release_mem_region(res->start, resource_size(res)); 914 915 mmc_free_host(mmc); 916 917 dev_info(&pdev->dev, "WMT MCI device removed\n"); 918 919 return 0; 920 } 921 922 #ifdef CONFIG_PM 923 static int wmt_mci_suspend(struct device *dev) 924 { 925 u32 reg_tmp; 926 struct platform_device *pdev = to_platform_device(dev); 927 struct mmc_host *mmc = platform_get_drvdata(pdev); 928 struct wmt_mci_priv *priv; 929 930 if (!mmc) 931 return 0; 932 933 priv = mmc_priv(mmc); 934 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); 935 writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + 936 SDMMC_BUSMODE); 937 938 reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); 939 writew(reg_tmp & 0x5FFF, priv->sdmmc_base + SDMMC_BLKLEN); 940 941 writeb(0xFF, priv->sdmmc_base + SDMMC_STS0); 942 writeb(0xFF, priv->sdmmc_base + SDMMC_STS1); 943 944 clk_disable(priv->clk_sdmmc); 945 return 0; 946 } 947 948 static int wmt_mci_resume(struct device *dev) 949 { 950 u32 reg_tmp; 951 struct platform_device *pdev = to_platform_device(dev); 952 struct mmc_host *mmc = platform_get_drvdata(pdev); 953 struct wmt_mci_priv *priv; 954 955 if (mmc) { 956 priv = mmc_priv(mmc); 957 clk_enable(priv->clk_sdmmc); 958 959 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE); 960 writeb(reg_tmp | BM_SOFT_RESET, priv->sdmmc_base + 961 SDMMC_BUSMODE); 962 963 reg_tmp = readw(priv->sdmmc_base + SDMMC_BLKLEN); 964 writew(reg_tmp | (BLKL_GPI_CD | BLKL_INT_ENABLE), 965 priv->sdmmc_base + SDMMC_BLKLEN); 966 967 reg_tmp = readb(priv->sdmmc_base + SDMMC_INTMASK0); 968 writeb(reg_tmp | INT0_DI_INT_EN, priv->sdmmc_base + 969 SDMMC_INTMASK0); 970 971 } 972 973 return 0; 974 } 975 976 static const struct dev_pm_ops wmt_mci_pm = { 977 .suspend = wmt_mci_suspend, 978 .resume = wmt_mci_resume, 979 }; 980 981 #define wmt_mci_pm_ops (&wmt_mci_pm) 982 983 #else /* !CONFIG_PM */ 984 985 #define wmt_mci_pm_ops NULL 986 987 #endif 988 989 static struct platform_driver wmt_mci_driver = { 990 .probe = wmt_mci_probe, 991 .remove = wmt_mci_remove, 992 .driver = { 993 .name = DRIVER_NAME, 994 .pm = wmt_mci_pm_ops, 995 .of_match_table = wmt_mci_dt_ids, 996 }, 997 }; 998 999 module_platform_driver(wmt_mci_driver); 1000 1001 MODULE_DESCRIPTION("Wondermedia MMC/SD Driver"); 1002 MODULE_AUTHOR("Tony Prisk"); 1003 MODULE_LICENSE("GPL v2"); 1004 MODULE_DEVICE_TABLE(of, wmt_mci_dt_ids); 1005