1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tifm_sd.c - TI FlashMedia driver 4 * 5 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com> 6 * 7 * Special thanks to Brad Campbell for extensive testing of this driver. 8 */ 9 10 11 #include <linux/tifm.h> 12 #include <linux/mmc/host.h> 13 #include <linux/highmem.h> 14 #include <linux/scatterlist.h> 15 #include <linux/module.h> 16 #include <asm/io.h> 17 18 #define DRIVER_NAME "tifm_sd" 19 #define DRIVER_VERSION "0.8" 20 21 static bool no_dma = 0; 22 static bool fixed_timeout = 0; 23 module_param(no_dma, bool, 0644); 24 module_param(fixed_timeout, bool, 0644); 25 26 /* Constants here are mostly from OMAP5912 datasheet */ 27 #define TIFM_MMCSD_RESET 0x0002 28 #define TIFM_MMCSD_CLKMASK 0x03ff 29 #define TIFM_MMCSD_POWER 0x0800 30 #define TIFM_MMCSD_4BBUS 0x8000 31 #define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */ 32 #define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */ 33 #define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */ 34 #define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */ 35 #define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */ 36 #define TIFM_MMCSD_READ 0x8000 37 38 #define TIFM_MMCSD_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */ 39 #define TIFM_MMCSD_EOC 0x0001 /* end of command phase */ 40 #define TIFM_MMCSD_CD 0x0002 /* card detect */ 41 #define TIFM_MMCSD_CB 0x0004 /* card enter busy state */ 42 #define TIFM_MMCSD_BRS 0x0008 /* block received/sent */ 43 #define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */ 44 #define TIFM_MMCSD_DTO 0x0020 /* data time-out */ 45 #define TIFM_MMCSD_DCRC 0x0040 /* data crc error */ 46 #define TIFM_MMCSD_CTO 0x0080 /* command time-out */ 47 #define TIFM_MMCSD_CCRC 0x0100 /* command crc error */ 48 #define TIFM_MMCSD_AF 0x0400 /* fifo almost full */ 49 #define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */ 50 #define TIFM_MMCSD_OCRB 0x1000 /* OCR busy */ 51 #define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */ 52 #define TIFM_MMCSD_CERR 0x4000 /* card status error */ 53 54 #define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */ 55 #define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */ 56 57 #define TIFM_MMCSD_FIFO_SIZE 0x0020 58 59 #define TIFM_MMCSD_RSP_R0 0x0000 60 #define TIFM_MMCSD_RSP_R1 0x0100 61 #define TIFM_MMCSD_RSP_R2 0x0200 62 #define TIFM_MMCSD_RSP_R3 0x0300 63 #define TIFM_MMCSD_RSP_R4 0x0400 64 #define TIFM_MMCSD_RSP_R5 0x0500 65 #define TIFM_MMCSD_RSP_R6 0x0600 66 67 #define TIFM_MMCSD_RSP_BUSY 0x0800 68 69 #define TIFM_MMCSD_CMD_BC 0x0000 70 #define TIFM_MMCSD_CMD_BCR 0x1000 71 #define TIFM_MMCSD_CMD_AC 0x2000 72 #define TIFM_MMCSD_CMD_ADTC 0x3000 73 74 #define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL 75 76 #define TIFM_MMCSD_REQ_TIMEOUT_MS 1000 77 78 enum { 79 CMD_READY = 0x0001, 80 FIFO_READY = 0x0002, 81 BRS_READY = 0x0004, 82 SCMD_ACTIVE = 0x0008, 83 SCMD_READY = 0x0010, 84 CARD_BUSY = 0x0020, 85 DATA_CARRY = 0x0040 86 }; 87 88 struct tifm_sd { 89 struct tifm_dev *dev; 90 91 unsigned short eject:1, 92 open_drain:1, 93 no_dma:1; 94 unsigned short cmd_flags; 95 96 unsigned int clk_freq; 97 unsigned int clk_div; 98 unsigned long timeout_jiffies; 99 100 struct tasklet_struct finish_tasklet; 101 struct timer_list timer; 102 struct mmc_request *req; 103 104 int sg_len; 105 int sg_pos; 106 unsigned int block_pos; 107 struct scatterlist bounce_buf; 108 unsigned char bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE]; 109 }; 110 111 /* for some reason, host won't respond correctly to readw/writew */ 112 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg, 113 unsigned int off, unsigned int cnt) 114 { 115 struct tifm_dev *sock = host->dev; 116 unsigned char *buf; 117 unsigned int pos = 0, val; 118 119 buf = kmap_local_page(pg) + off; 120 if (host->cmd_flags & DATA_CARRY) { 121 buf[pos++] = host->bounce_buf_data[0]; 122 host->cmd_flags &= ~DATA_CARRY; 123 } 124 125 while (pos < cnt) { 126 val = readl(sock->addr + SOCK_MMCSD_DATA); 127 buf[pos++] = val & 0xff; 128 if (pos == cnt) { 129 host->bounce_buf_data[0] = (val >> 8) & 0xff; 130 host->cmd_flags |= DATA_CARRY; 131 break; 132 } 133 buf[pos++] = (val >> 8) & 0xff; 134 } 135 kunmap_local(buf - off); 136 } 137 138 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg, 139 unsigned int off, unsigned int cnt) 140 { 141 struct tifm_dev *sock = host->dev; 142 unsigned char *buf; 143 unsigned int pos = 0, val; 144 145 buf = kmap_local_page(pg) + off; 146 if (host->cmd_flags & DATA_CARRY) { 147 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00); 148 writel(val, sock->addr + SOCK_MMCSD_DATA); 149 host->cmd_flags &= ~DATA_CARRY; 150 } 151 152 while (pos < cnt) { 153 val = buf[pos++]; 154 if (pos == cnt) { 155 host->bounce_buf_data[0] = val & 0xff; 156 host->cmd_flags |= DATA_CARRY; 157 break; 158 } 159 val |= (buf[pos++] << 8) & 0xff00; 160 writel(val, sock->addr + SOCK_MMCSD_DATA); 161 } 162 kunmap_local(buf - off); 163 } 164 165 static void tifm_sd_transfer_data(struct tifm_sd *host) 166 { 167 struct mmc_data *r_data = host->req->cmd->data; 168 struct scatterlist *sg = r_data->sg; 169 unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2; 170 unsigned int p_off, p_cnt; 171 struct page *pg; 172 173 if (host->sg_pos == host->sg_len) 174 return; 175 while (t_size) { 176 cnt = sg[host->sg_pos].length - host->block_pos; 177 if (!cnt) { 178 host->block_pos = 0; 179 host->sg_pos++; 180 if (host->sg_pos == host->sg_len) { 181 if ((r_data->flags & MMC_DATA_WRITE) 182 && (host->cmd_flags & DATA_CARRY)) 183 writel(host->bounce_buf_data[0], 184 host->dev->addr 185 + SOCK_MMCSD_DATA); 186 187 return; 188 } 189 cnt = sg[host->sg_pos].length; 190 } 191 off = sg[host->sg_pos].offset + host->block_pos; 192 193 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT); 194 p_off = offset_in_page(off); 195 p_cnt = PAGE_SIZE - p_off; 196 p_cnt = min(p_cnt, cnt); 197 p_cnt = min(p_cnt, t_size); 198 199 if (r_data->flags & MMC_DATA_READ) 200 tifm_sd_read_fifo(host, pg, p_off, p_cnt); 201 else if (r_data->flags & MMC_DATA_WRITE) 202 tifm_sd_write_fifo(host, pg, p_off, p_cnt); 203 204 t_size -= p_cnt; 205 host->block_pos += p_cnt; 206 } 207 } 208 209 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off, 210 struct page *src, unsigned int src_off, 211 unsigned int count) 212 { 213 unsigned char *src_buf = kmap_local_page(src) + src_off; 214 unsigned char *dst_buf = kmap_local_page(dst) + dst_off; 215 216 memcpy(dst_buf, src_buf, count); 217 218 kunmap_local(dst_buf - dst_off); 219 kunmap_local(src_buf - src_off); 220 } 221 222 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data) 223 { 224 struct scatterlist *sg = r_data->sg; 225 unsigned int t_size = r_data->blksz; 226 unsigned int off, cnt; 227 unsigned int p_off, p_cnt; 228 struct page *pg; 229 230 dev_dbg(&host->dev->dev, "bouncing block\n"); 231 while (t_size) { 232 cnt = sg[host->sg_pos].length - host->block_pos; 233 if (!cnt) { 234 host->block_pos = 0; 235 host->sg_pos++; 236 if (host->sg_pos == host->sg_len) 237 return; 238 cnt = sg[host->sg_pos].length; 239 } 240 off = sg[host->sg_pos].offset + host->block_pos; 241 242 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT); 243 p_off = offset_in_page(off); 244 p_cnt = PAGE_SIZE - p_off; 245 p_cnt = min(p_cnt, cnt); 246 p_cnt = min(p_cnt, t_size); 247 248 if (r_data->flags & MMC_DATA_WRITE) 249 tifm_sd_copy_page(sg_page(&host->bounce_buf), 250 r_data->blksz - t_size, 251 pg, p_off, p_cnt); 252 else if (r_data->flags & MMC_DATA_READ) 253 tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf), 254 r_data->blksz - t_size, p_cnt); 255 256 t_size -= p_cnt; 257 host->block_pos += p_cnt; 258 } 259 } 260 261 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data) 262 { 263 struct tifm_dev *sock = host->dev; 264 unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz; 265 unsigned int dma_len, dma_blk_cnt, dma_off; 266 struct scatterlist *sg = NULL; 267 268 if (host->sg_pos == host->sg_len) 269 return 1; 270 271 if (host->cmd_flags & DATA_CARRY) { 272 host->cmd_flags &= ~DATA_CARRY; 273 tifm_sd_bounce_block(host, r_data); 274 if (host->sg_pos == host->sg_len) 275 return 1; 276 } 277 278 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos; 279 if (!dma_len) { 280 host->block_pos = 0; 281 host->sg_pos++; 282 if (host->sg_pos == host->sg_len) 283 return 1; 284 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]); 285 } 286 287 if (dma_len < t_size) { 288 dma_blk_cnt = dma_len / r_data->blksz; 289 dma_off = host->block_pos; 290 host->block_pos += dma_blk_cnt * r_data->blksz; 291 } else { 292 dma_blk_cnt = TIFM_DMA_TSIZE; 293 dma_off = host->block_pos; 294 host->block_pos += t_size; 295 } 296 297 if (dma_blk_cnt) 298 sg = &r_data->sg[host->sg_pos]; 299 else if (dma_len) { 300 if (r_data->flags & MMC_DATA_WRITE) 301 tifm_sd_bounce_block(host, r_data); 302 else 303 host->cmd_flags |= DATA_CARRY; 304 305 sg = &host->bounce_buf; 306 dma_off = 0; 307 dma_blk_cnt = 1; 308 } else 309 return 1; 310 311 dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt); 312 writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS); 313 if (r_data->flags & MMC_DATA_WRITE) 314 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN, 315 sock->addr + SOCK_DMA_CONTROL); 316 else 317 writel((dma_blk_cnt << 8) | TIFM_DMA_EN, 318 sock->addr + SOCK_DMA_CONTROL); 319 320 return 0; 321 } 322 323 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd) 324 { 325 unsigned int rc = 0; 326 327 switch (mmc_resp_type(cmd)) { 328 case MMC_RSP_NONE: 329 rc |= TIFM_MMCSD_RSP_R0; 330 break; 331 case MMC_RSP_R1B: 332 rc |= TIFM_MMCSD_RSP_BUSY; 333 fallthrough; 334 case MMC_RSP_R1: 335 rc |= TIFM_MMCSD_RSP_R1; 336 break; 337 case MMC_RSP_R2: 338 rc |= TIFM_MMCSD_RSP_R2; 339 break; 340 case MMC_RSP_R3: 341 rc |= TIFM_MMCSD_RSP_R3; 342 break; 343 default: 344 BUG(); 345 } 346 347 switch (mmc_cmd_type(cmd)) { 348 case MMC_CMD_BC: 349 rc |= TIFM_MMCSD_CMD_BC; 350 break; 351 case MMC_CMD_BCR: 352 rc |= TIFM_MMCSD_CMD_BCR; 353 break; 354 case MMC_CMD_AC: 355 rc |= TIFM_MMCSD_CMD_AC; 356 break; 357 case MMC_CMD_ADTC: 358 rc |= TIFM_MMCSD_CMD_ADTC; 359 break; 360 default: 361 BUG(); 362 } 363 return rc; 364 } 365 366 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd) 367 { 368 struct tifm_dev *sock = host->dev; 369 unsigned int cmd_mask = tifm_sd_op_flags(cmd); 370 371 if (host->open_drain) 372 cmd_mask |= TIFM_MMCSD_ODTO; 373 374 if (cmd->data && (cmd->data->flags & MMC_DATA_READ)) 375 cmd_mask |= TIFM_MMCSD_READ; 376 377 dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n", 378 cmd->opcode, cmd->arg, cmd_mask); 379 380 writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH); 381 writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW); 382 writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND); 383 } 384 385 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock) 386 { 387 cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16) 388 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18); 389 cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16) 390 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10); 391 cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16) 392 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08); 393 cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16) 394 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00); 395 } 396 397 static void tifm_sd_check_status(struct tifm_sd *host) 398 { 399 struct tifm_dev *sock = host->dev; 400 struct mmc_command *cmd = host->req->cmd; 401 402 if (cmd->error) 403 goto finish_request; 404 405 if (!(host->cmd_flags & CMD_READY)) 406 return; 407 408 if (cmd->data) { 409 if (cmd->data->error) { 410 if ((host->cmd_flags & SCMD_ACTIVE) 411 && !(host->cmd_flags & SCMD_READY)) 412 return; 413 414 goto finish_request; 415 } 416 417 if (!(host->cmd_flags & BRS_READY)) 418 return; 419 420 if (!(host->no_dma || (host->cmd_flags & FIFO_READY))) 421 return; 422 423 if (cmd->data->flags & MMC_DATA_WRITE) { 424 if (host->req->stop) { 425 if (!(host->cmd_flags & SCMD_ACTIVE)) { 426 host->cmd_flags |= SCMD_ACTIVE; 427 writel(TIFM_MMCSD_EOFB 428 | readl(sock->addr 429 + SOCK_MMCSD_INT_ENABLE), 430 sock->addr 431 + SOCK_MMCSD_INT_ENABLE); 432 tifm_sd_exec(host, host->req->stop); 433 return; 434 } else { 435 if (!(host->cmd_flags & SCMD_READY) 436 || (host->cmd_flags & CARD_BUSY)) 437 return; 438 writel((~TIFM_MMCSD_EOFB) 439 & readl(sock->addr 440 + SOCK_MMCSD_INT_ENABLE), 441 sock->addr 442 + SOCK_MMCSD_INT_ENABLE); 443 } 444 } else { 445 if (host->cmd_flags & CARD_BUSY) 446 return; 447 writel((~TIFM_MMCSD_EOFB) 448 & readl(sock->addr 449 + SOCK_MMCSD_INT_ENABLE), 450 sock->addr + SOCK_MMCSD_INT_ENABLE); 451 } 452 } else { 453 if (host->req->stop) { 454 if (!(host->cmd_flags & SCMD_ACTIVE)) { 455 host->cmd_flags |= SCMD_ACTIVE; 456 tifm_sd_exec(host, host->req->stop); 457 return; 458 } else { 459 if (!(host->cmd_flags & SCMD_READY)) 460 return; 461 } 462 } 463 } 464 } 465 finish_request: 466 tasklet_schedule(&host->finish_tasklet); 467 } 468 469 /* Called from interrupt handler */ 470 static void tifm_sd_data_event(struct tifm_dev *sock) 471 { 472 struct tifm_sd *host; 473 unsigned int fifo_status = 0; 474 struct mmc_data *r_data = NULL; 475 476 spin_lock(&sock->lock); 477 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock)); 478 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS); 479 dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n", 480 fifo_status, host->cmd_flags); 481 482 if (host->req) { 483 r_data = host->req->cmd->data; 484 485 if (r_data && (fifo_status & TIFM_FIFO_READY)) { 486 if (tifm_sd_set_dma_data(host, r_data)) { 487 host->cmd_flags |= FIFO_READY; 488 tifm_sd_check_status(host); 489 } 490 } 491 } 492 493 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS); 494 spin_unlock(&sock->lock); 495 } 496 497 /* Called from interrupt handler */ 498 static void tifm_sd_card_event(struct tifm_dev *sock) 499 { 500 struct tifm_sd *host; 501 unsigned int host_status = 0; 502 int cmd_error = 0; 503 struct mmc_command *cmd = NULL; 504 505 spin_lock(&sock->lock); 506 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock)); 507 host_status = readl(sock->addr + SOCK_MMCSD_STATUS); 508 dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n", 509 host_status, host->cmd_flags); 510 511 if (host->req) { 512 cmd = host->req->cmd; 513 514 if (host_status & TIFM_MMCSD_ERRMASK) { 515 writel(host_status & TIFM_MMCSD_ERRMASK, 516 sock->addr + SOCK_MMCSD_STATUS); 517 if (host_status & TIFM_MMCSD_CTO) 518 cmd_error = -ETIMEDOUT; 519 else if (host_status & TIFM_MMCSD_CCRC) 520 cmd_error = -EILSEQ; 521 522 if (cmd->data) { 523 if (host_status & TIFM_MMCSD_DTO) 524 cmd->data->error = -ETIMEDOUT; 525 else if (host_status & TIFM_MMCSD_DCRC) 526 cmd->data->error = -EILSEQ; 527 } 528 529 writel(TIFM_FIFO_INT_SETALL, 530 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 531 writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL); 532 533 if (host->req->stop) { 534 if (host->cmd_flags & SCMD_ACTIVE) { 535 host->req->stop->error = cmd_error; 536 host->cmd_flags |= SCMD_READY; 537 } else { 538 cmd->error = cmd_error; 539 host->cmd_flags |= SCMD_ACTIVE; 540 tifm_sd_exec(host, host->req->stop); 541 goto done; 542 } 543 } else 544 cmd->error = cmd_error; 545 } else { 546 if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) { 547 if (!(host->cmd_flags & CMD_READY)) { 548 host->cmd_flags |= CMD_READY; 549 tifm_sd_fetch_resp(cmd, sock); 550 } else if (host->cmd_flags & SCMD_ACTIVE) { 551 host->cmd_flags |= SCMD_READY; 552 tifm_sd_fetch_resp(host->req->stop, 553 sock); 554 } 555 } 556 if (host_status & TIFM_MMCSD_BRS) 557 host->cmd_flags |= BRS_READY; 558 } 559 560 if (host->no_dma && cmd->data) { 561 if (host_status & TIFM_MMCSD_AE) 562 writel(host_status & TIFM_MMCSD_AE, 563 sock->addr + SOCK_MMCSD_STATUS); 564 565 if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF 566 | TIFM_MMCSD_BRS)) { 567 tifm_sd_transfer_data(host); 568 host_status &= ~TIFM_MMCSD_AE; 569 } 570 } 571 572 if (host_status & TIFM_MMCSD_EOFB) 573 host->cmd_flags &= ~CARD_BUSY; 574 else if (host_status & TIFM_MMCSD_CB) 575 host->cmd_flags |= CARD_BUSY; 576 577 tifm_sd_check_status(host); 578 } 579 done: 580 writel(host_status, sock->addr + SOCK_MMCSD_STATUS); 581 spin_unlock(&sock->lock); 582 } 583 584 static void tifm_sd_set_data_timeout(struct tifm_sd *host, 585 struct mmc_data *data) 586 { 587 struct tifm_dev *sock = host->dev; 588 unsigned int data_timeout = data->timeout_clks; 589 590 if (fixed_timeout) 591 return; 592 593 data_timeout += data->timeout_ns / 594 ((1000000000UL / host->clk_freq) * host->clk_div); 595 596 if (data_timeout < 0xffff) { 597 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO); 598 writel((~TIFM_MMCSD_DPE) 599 & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG), 600 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG); 601 } else { 602 data_timeout = (data_timeout >> 10) + 1; 603 if (data_timeout > 0xffff) 604 data_timeout = 0; /* set to unlimited */ 605 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO); 606 writel(TIFM_MMCSD_DPE 607 | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG), 608 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG); 609 } 610 } 611 612 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq) 613 { 614 struct tifm_sd *host = mmc_priv(mmc); 615 struct tifm_dev *sock = host->dev; 616 unsigned long flags; 617 struct mmc_data *r_data = mrq->cmd->data; 618 619 spin_lock_irqsave(&sock->lock, flags); 620 if (host->eject) { 621 mrq->cmd->error = -ENOMEDIUM; 622 goto err_out; 623 } 624 625 if (host->req) { 626 pr_err("%s : unfinished request detected\n", 627 dev_name(&sock->dev)); 628 mrq->cmd->error = -ETIMEDOUT; 629 goto err_out; 630 } 631 632 host->cmd_flags = 0; 633 host->block_pos = 0; 634 host->sg_pos = 0; 635 636 if (mrq->data && !is_power_of_2(mrq->data->blksz)) 637 host->no_dma = 1; 638 else 639 host->no_dma = no_dma ? 1 : 0; 640 641 if (r_data) { 642 tifm_sd_set_data_timeout(host, r_data); 643 644 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop) 645 writel(TIFM_MMCSD_EOFB 646 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 647 sock->addr + SOCK_MMCSD_INT_ENABLE); 648 649 if (host->no_dma) { 650 writel(TIFM_MMCSD_BUFINT 651 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 652 sock->addr + SOCK_MMCSD_INT_ENABLE); 653 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) 654 | (TIFM_MMCSD_FIFO_SIZE - 1), 655 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 656 657 host->sg_len = r_data->sg_len; 658 } else { 659 sg_init_one(&host->bounce_buf, host->bounce_buf_data, 660 r_data->blksz); 661 662 if(1 != tifm_map_sg(sock, &host->bounce_buf, 1, 663 r_data->flags & MMC_DATA_WRITE 664 ? DMA_TO_DEVICE 665 : DMA_FROM_DEVICE)) { 666 pr_err("%s : scatterlist map failed\n", 667 dev_name(&sock->dev)); 668 mrq->cmd->error = -ENOMEM; 669 goto err_out; 670 } 671 host->sg_len = tifm_map_sg(sock, r_data->sg, 672 r_data->sg_len, 673 r_data->flags 674 & MMC_DATA_WRITE 675 ? DMA_TO_DEVICE 676 : DMA_FROM_DEVICE); 677 if (host->sg_len < 1) { 678 pr_err("%s : scatterlist map failed\n", 679 dev_name(&sock->dev)); 680 tifm_unmap_sg(sock, &host->bounce_buf, 1, 681 r_data->flags & MMC_DATA_WRITE 682 ? DMA_TO_DEVICE 683 : DMA_FROM_DEVICE); 684 mrq->cmd->error = -ENOMEM; 685 goto err_out; 686 } 687 688 writel(TIFM_FIFO_INT_SETALL, 689 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 690 writel(ilog2(r_data->blksz) - 2, 691 sock->addr + SOCK_FIFO_PAGE_SIZE); 692 writel(TIFM_FIFO_ENABLE, 693 sock->addr + SOCK_FIFO_CONTROL); 694 writel(TIFM_FIFO_INTMASK, 695 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET); 696 697 if (r_data->flags & MMC_DATA_WRITE) 698 writel(TIFM_MMCSD_TXDE, 699 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 700 else 701 writel(TIFM_MMCSD_RXDE, 702 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 703 704 tifm_sd_set_dma_data(host, r_data); 705 } 706 707 writel(r_data->blocks - 1, 708 sock->addr + SOCK_MMCSD_NUM_BLOCKS); 709 writel(r_data->blksz - 1, 710 sock->addr + SOCK_MMCSD_BLOCK_LEN); 711 } 712 713 host->req = mrq; 714 mod_timer(&host->timer, jiffies + host->timeout_jiffies); 715 writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL), 716 sock->addr + SOCK_CONTROL); 717 tifm_sd_exec(host, mrq->cmd); 718 spin_unlock_irqrestore(&sock->lock, flags); 719 return; 720 721 err_out: 722 spin_unlock_irqrestore(&sock->lock, flags); 723 mmc_request_done(mmc, mrq); 724 } 725 726 static void tifm_sd_end_cmd(struct tasklet_struct *t) 727 { 728 struct tifm_sd *host = from_tasklet(host, t, finish_tasklet); 729 struct tifm_dev *sock = host->dev; 730 struct mmc_host *mmc = tifm_get_drvdata(sock); 731 struct mmc_request *mrq; 732 struct mmc_data *r_data = NULL; 733 unsigned long flags; 734 735 spin_lock_irqsave(&sock->lock, flags); 736 737 del_timer(&host->timer); 738 mrq = host->req; 739 host->req = NULL; 740 741 if (!mrq) { 742 pr_err(" %s : no request to complete?\n", 743 dev_name(&sock->dev)); 744 spin_unlock_irqrestore(&sock->lock, flags); 745 return; 746 } 747 748 r_data = mrq->cmd->data; 749 if (r_data) { 750 if (host->no_dma) { 751 writel((~TIFM_MMCSD_BUFINT) 752 & readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 753 sock->addr + SOCK_MMCSD_INT_ENABLE); 754 } else { 755 tifm_unmap_sg(sock, &host->bounce_buf, 1, 756 (r_data->flags & MMC_DATA_WRITE) 757 ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 758 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len, 759 (r_data->flags & MMC_DATA_WRITE) 760 ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 761 } 762 763 r_data->bytes_xfered = r_data->blocks 764 - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1; 765 r_data->bytes_xfered *= r_data->blksz; 766 r_data->bytes_xfered += r_data->blksz 767 - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1; 768 } 769 770 writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL), 771 sock->addr + SOCK_CONTROL); 772 773 spin_unlock_irqrestore(&sock->lock, flags); 774 mmc_request_done(mmc, mrq); 775 } 776 777 static void tifm_sd_abort(struct timer_list *t) 778 { 779 struct tifm_sd *host = from_timer(host, t, timer); 780 781 pr_err("%s : card failed to respond for a long period of time " 782 "(%x, %x)\n", 783 dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags); 784 785 tifm_eject(host->dev); 786 } 787 788 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios) 789 { 790 struct tifm_sd *host = mmc_priv(mmc); 791 struct tifm_dev *sock = host->dev; 792 unsigned int clk_div1, clk_div2; 793 unsigned long flags; 794 795 spin_lock_irqsave(&sock->lock, flags); 796 797 dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, " 798 "chip_select = %x, power_mode = %x, bus_width = %x\n", 799 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select, 800 ios->power_mode, ios->bus_width); 801 802 if (ios->bus_width == MMC_BUS_WIDTH_4) { 803 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG), 804 sock->addr + SOCK_MMCSD_CONFIG); 805 } else { 806 writel((~TIFM_MMCSD_4BBUS) 807 & readl(sock->addr + SOCK_MMCSD_CONFIG), 808 sock->addr + SOCK_MMCSD_CONFIG); 809 } 810 811 if (ios->clock) { 812 clk_div1 = 20000000 / ios->clock; 813 if (!clk_div1) 814 clk_div1 = 1; 815 816 clk_div2 = 24000000 / ios->clock; 817 if (!clk_div2) 818 clk_div2 = 1; 819 820 if ((20000000 / clk_div1) > ios->clock) 821 clk_div1++; 822 if ((24000000 / clk_div2) > ios->clock) 823 clk_div2++; 824 if ((20000000 / clk_div1) > (24000000 / clk_div2)) { 825 host->clk_freq = 20000000; 826 host->clk_div = clk_div1; 827 writel((~TIFM_CTRL_FAST_CLK) 828 & readl(sock->addr + SOCK_CONTROL), 829 sock->addr + SOCK_CONTROL); 830 } else { 831 host->clk_freq = 24000000; 832 host->clk_div = clk_div2; 833 writel(TIFM_CTRL_FAST_CLK 834 | readl(sock->addr + SOCK_CONTROL), 835 sock->addr + SOCK_CONTROL); 836 } 837 } else { 838 host->clk_div = 0; 839 } 840 host->clk_div &= TIFM_MMCSD_CLKMASK; 841 writel(host->clk_div 842 | ((~TIFM_MMCSD_CLKMASK) 843 & readl(sock->addr + SOCK_MMCSD_CONFIG)), 844 sock->addr + SOCK_MMCSD_CONFIG); 845 846 host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN); 847 848 /* chip_select : maybe later */ 849 //vdd 850 //power is set before probe / after remove 851 852 spin_unlock_irqrestore(&sock->lock, flags); 853 } 854 855 static int tifm_sd_ro(struct mmc_host *mmc) 856 { 857 int rc = 0; 858 struct tifm_sd *host = mmc_priv(mmc); 859 struct tifm_dev *sock = host->dev; 860 unsigned long flags; 861 862 spin_lock_irqsave(&sock->lock, flags); 863 if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE)) 864 rc = 1; 865 spin_unlock_irqrestore(&sock->lock, flags); 866 return rc; 867 } 868 869 static const struct mmc_host_ops tifm_sd_ops = { 870 .request = tifm_sd_request, 871 .set_ios = tifm_sd_ios, 872 .get_ro = tifm_sd_ro 873 }; 874 875 static int tifm_sd_initialize_host(struct tifm_sd *host) 876 { 877 int rc; 878 unsigned int host_status = 0; 879 struct tifm_dev *sock = host->dev; 880 881 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE); 882 host->clk_div = 61; 883 host->clk_freq = 20000000; 884 writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL); 885 writel(host->clk_div | TIFM_MMCSD_POWER, 886 sock->addr + SOCK_MMCSD_CONFIG); 887 888 /* wait up to 0.51 sec for reset */ 889 for (rc = 32; rc <= 256; rc <<= 1) { 890 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) { 891 rc = 0; 892 break; 893 } 894 msleep(rc); 895 } 896 897 if (rc) { 898 pr_err("%s : controller failed to reset\n", 899 dev_name(&sock->dev)); 900 return -ENODEV; 901 } 902 903 writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS); 904 writel(host->clk_div | TIFM_MMCSD_POWER, 905 sock->addr + SOCK_MMCSD_CONFIG); 906 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 907 908 // command timeout fixed to 64 clocks for now 909 writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); 910 writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND); 911 912 for (rc = 16; rc <= 64; rc <<= 1) { 913 host_status = readl(sock->addr + SOCK_MMCSD_STATUS); 914 writel(host_status, sock->addr + SOCK_MMCSD_STATUS); 915 if (!(host_status & TIFM_MMCSD_ERRMASK) 916 && (host_status & TIFM_MMCSD_EOC)) { 917 rc = 0; 918 break; 919 } 920 msleep(rc); 921 } 922 923 if (rc) { 924 pr_err("%s : card not ready - probe failed on initialization\n", 925 dev_name(&sock->dev)); 926 return -ENODEV; 927 } 928 929 writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC 930 | TIFM_MMCSD_ERRMASK, 931 sock->addr + SOCK_MMCSD_INT_ENABLE); 932 933 return 0; 934 } 935 936 static int tifm_sd_probe(struct tifm_dev *sock) 937 { 938 struct mmc_host *mmc; 939 struct tifm_sd *host; 940 int rc = -EIO; 941 942 if (!(TIFM_SOCK_STATE_OCCUPIED 943 & readl(sock->addr + SOCK_PRESENT_STATE))) { 944 pr_warn("%s : card gone, unexpectedly\n", 945 dev_name(&sock->dev)); 946 return rc; 947 } 948 949 mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev); 950 if (!mmc) 951 return -ENOMEM; 952 953 host = mmc_priv(mmc); 954 tifm_set_drvdata(sock, mmc); 955 host->dev = sock; 956 host->timeout_jiffies = msecs_to_jiffies(TIFM_MMCSD_REQ_TIMEOUT_MS); 957 /* 958 * We use a fixed request timeout of 1s, hence inform the core about it. 959 * A future improvement should instead respect the cmd->busy_timeout. 960 */ 961 mmc->max_busy_timeout = TIFM_MMCSD_REQ_TIMEOUT_MS; 962 963 tasklet_setup(&host->finish_tasklet, tifm_sd_end_cmd); 964 timer_setup(&host->timer, tifm_sd_abort, 0); 965 966 mmc->ops = &tifm_sd_ops; 967 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 968 mmc->caps = MMC_CAP_4_BIT_DATA; 969 mmc->f_min = 20000000 / 60; 970 mmc->f_max = 24000000; 971 972 mmc->max_blk_count = 2048; 973 mmc->max_segs = mmc->max_blk_count; 974 mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE); 975 mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size; 976 mmc->max_req_size = mmc->max_seg_size; 977 978 sock->card_event = tifm_sd_card_event; 979 sock->data_event = tifm_sd_data_event; 980 rc = tifm_sd_initialize_host(host); 981 982 if (!rc) 983 rc = mmc_add_host(mmc); 984 if (!rc) 985 return 0; 986 987 mmc_free_host(mmc); 988 return rc; 989 } 990 991 static void tifm_sd_remove(struct tifm_dev *sock) 992 { 993 struct mmc_host *mmc = tifm_get_drvdata(sock); 994 struct tifm_sd *host = mmc_priv(mmc); 995 unsigned long flags; 996 997 spin_lock_irqsave(&sock->lock, flags); 998 host->eject = 1; 999 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE); 1000 spin_unlock_irqrestore(&sock->lock, flags); 1001 1002 tasklet_kill(&host->finish_tasklet); 1003 1004 spin_lock_irqsave(&sock->lock, flags); 1005 if (host->req) { 1006 writel(TIFM_FIFO_INT_SETALL, 1007 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 1008 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET); 1009 host->req->cmd->error = -ENOMEDIUM; 1010 if (host->req->stop) 1011 host->req->stop->error = -ENOMEDIUM; 1012 tasklet_schedule(&host->finish_tasklet); 1013 } 1014 spin_unlock_irqrestore(&sock->lock, flags); 1015 mmc_remove_host(mmc); 1016 dev_dbg(&sock->dev, "after remove\n"); 1017 1018 mmc_free_host(mmc); 1019 } 1020 1021 #ifdef CONFIG_PM 1022 1023 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state) 1024 { 1025 return 0; 1026 } 1027 1028 static int tifm_sd_resume(struct tifm_dev *sock) 1029 { 1030 struct mmc_host *mmc = tifm_get_drvdata(sock); 1031 struct tifm_sd *host = mmc_priv(mmc); 1032 int rc; 1033 1034 rc = tifm_sd_initialize_host(host); 1035 dev_dbg(&sock->dev, "resume initialize %d\n", rc); 1036 1037 if (rc) 1038 host->eject = 1; 1039 1040 return rc; 1041 } 1042 1043 #else 1044 1045 #define tifm_sd_suspend NULL 1046 #define tifm_sd_resume NULL 1047 1048 #endif /* CONFIG_PM */ 1049 1050 static struct tifm_device_id tifm_sd_id_tbl[] = { 1051 { TIFM_TYPE_SD }, { } 1052 }; 1053 1054 static struct tifm_driver tifm_sd_driver = { 1055 .driver = { 1056 .name = DRIVER_NAME, 1057 .owner = THIS_MODULE 1058 }, 1059 .id_table = tifm_sd_id_tbl, 1060 .probe = tifm_sd_probe, 1061 .remove = tifm_sd_remove, 1062 .suspend = tifm_sd_suspend, 1063 .resume = tifm_sd_resume 1064 }; 1065 1066 static int __init tifm_sd_init(void) 1067 { 1068 return tifm_register_driver(&tifm_sd_driver); 1069 } 1070 1071 static void __exit tifm_sd_exit(void) 1072 { 1073 tifm_unregister_driver(&tifm_sd_driver); 1074 } 1075 1076 MODULE_AUTHOR("Alex Dubov"); 1077 MODULE_DESCRIPTION("TI FlashMedia SD driver"); 1078 MODULE_LICENSE("GPL"); 1079 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl); 1080 MODULE_VERSION(DRIVER_VERSION); 1081 1082 module_init(tifm_sd_init); 1083 module_exit(tifm_sd_exit); 1084