1 /* 2 * tifm_sd.c - TI FlashMedia driver 3 * 4 * Copyright (C) 2006 Alex Dubov <oakad@yahoo.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Special thanks to Brad Campbell for extensive testing of this driver. 11 * 12 */ 13 14 15 #include <linux/tifm.h> 16 #include <linux/mmc/host.h> 17 #include <linux/highmem.h> 18 #include <linux/scatterlist.h> 19 #include <linux/module.h> 20 #include <asm/io.h> 21 22 #define DRIVER_NAME "tifm_sd" 23 #define DRIVER_VERSION "0.8" 24 25 static bool no_dma = 0; 26 static bool fixed_timeout = 0; 27 module_param(no_dma, bool, 0644); 28 module_param(fixed_timeout, bool, 0644); 29 30 /* Constants here are mostly from OMAP5912 datasheet */ 31 #define TIFM_MMCSD_RESET 0x0002 32 #define TIFM_MMCSD_CLKMASK 0x03ff 33 #define TIFM_MMCSD_POWER 0x0800 34 #define TIFM_MMCSD_4BBUS 0x8000 35 #define TIFM_MMCSD_RXDE 0x8000 /* rx dma enable */ 36 #define TIFM_MMCSD_TXDE 0x0080 /* tx dma enable */ 37 #define TIFM_MMCSD_BUFINT 0x0c00 /* set bits: AE, AF */ 38 #define TIFM_MMCSD_DPE 0x0020 /* data timeout counted in kilocycles */ 39 #define TIFM_MMCSD_INAB 0x0080 /* abort / initialize command */ 40 #define TIFM_MMCSD_READ 0x8000 41 42 #define TIFM_MMCSD_ERRMASK 0x01e0 /* set bits: CCRC, CTO, DCRC, DTO */ 43 #define TIFM_MMCSD_EOC 0x0001 /* end of command phase */ 44 #define TIFM_MMCSD_CD 0x0002 /* card detect */ 45 #define TIFM_MMCSD_CB 0x0004 /* card enter busy state */ 46 #define TIFM_MMCSD_BRS 0x0008 /* block received/sent */ 47 #define TIFM_MMCSD_EOFB 0x0010 /* card exit busy state */ 48 #define TIFM_MMCSD_DTO 0x0020 /* data time-out */ 49 #define TIFM_MMCSD_DCRC 0x0040 /* data crc error */ 50 #define TIFM_MMCSD_CTO 0x0080 /* command time-out */ 51 #define TIFM_MMCSD_CCRC 0x0100 /* command crc error */ 52 #define TIFM_MMCSD_AF 0x0400 /* fifo almost full */ 53 #define TIFM_MMCSD_AE 0x0800 /* fifo almost empty */ 54 #define TIFM_MMCSD_OCRB 0x1000 /* OCR busy */ 55 #define TIFM_MMCSD_CIRQ 0x2000 /* card irq (cmd40/sdio) */ 56 #define TIFM_MMCSD_CERR 0x4000 /* card status error */ 57 58 #define TIFM_MMCSD_ODTO 0x0040 /* open drain / extended timeout */ 59 #define TIFM_MMCSD_CARD_RO 0x0200 /* card is read-only */ 60 61 #define TIFM_MMCSD_FIFO_SIZE 0x0020 62 63 #define TIFM_MMCSD_RSP_R0 0x0000 64 #define TIFM_MMCSD_RSP_R1 0x0100 65 #define TIFM_MMCSD_RSP_R2 0x0200 66 #define TIFM_MMCSD_RSP_R3 0x0300 67 #define TIFM_MMCSD_RSP_R4 0x0400 68 #define TIFM_MMCSD_RSP_R5 0x0500 69 #define TIFM_MMCSD_RSP_R6 0x0600 70 71 #define TIFM_MMCSD_RSP_BUSY 0x0800 72 73 #define TIFM_MMCSD_CMD_BC 0x0000 74 #define TIFM_MMCSD_CMD_BCR 0x1000 75 #define TIFM_MMCSD_CMD_AC 0x2000 76 #define TIFM_MMCSD_CMD_ADTC 0x3000 77 78 #define TIFM_MMCSD_MAX_BLOCK_SIZE 0x0800UL 79 80 enum { 81 CMD_READY = 0x0001, 82 FIFO_READY = 0x0002, 83 BRS_READY = 0x0004, 84 SCMD_ACTIVE = 0x0008, 85 SCMD_READY = 0x0010, 86 CARD_BUSY = 0x0020, 87 DATA_CARRY = 0x0040 88 }; 89 90 struct tifm_sd { 91 struct tifm_dev *dev; 92 93 unsigned short eject:1, 94 open_drain:1, 95 no_dma:1; 96 unsigned short cmd_flags; 97 98 unsigned int clk_freq; 99 unsigned int clk_div; 100 unsigned long timeout_jiffies; 101 102 struct tasklet_struct finish_tasklet; 103 struct timer_list timer; 104 struct mmc_request *req; 105 106 int sg_len; 107 int sg_pos; 108 unsigned int block_pos; 109 struct scatterlist bounce_buf; 110 unsigned char bounce_buf_data[TIFM_MMCSD_MAX_BLOCK_SIZE]; 111 }; 112 113 /* for some reason, host won't respond correctly to readw/writew */ 114 static void tifm_sd_read_fifo(struct tifm_sd *host, struct page *pg, 115 unsigned int off, unsigned int cnt) 116 { 117 struct tifm_dev *sock = host->dev; 118 unsigned char *buf; 119 unsigned int pos = 0, val; 120 121 buf = kmap_atomic(pg) + off; 122 if (host->cmd_flags & DATA_CARRY) { 123 buf[pos++] = host->bounce_buf_data[0]; 124 host->cmd_flags &= ~DATA_CARRY; 125 } 126 127 while (pos < cnt) { 128 val = readl(sock->addr + SOCK_MMCSD_DATA); 129 buf[pos++] = val & 0xff; 130 if (pos == cnt) { 131 host->bounce_buf_data[0] = (val >> 8) & 0xff; 132 host->cmd_flags |= DATA_CARRY; 133 break; 134 } 135 buf[pos++] = (val >> 8) & 0xff; 136 } 137 kunmap_atomic(buf - off); 138 } 139 140 static void tifm_sd_write_fifo(struct tifm_sd *host, struct page *pg, 141 unsigned int off, unsigned int cnt) 142 { 143 struct tifm_dev *sock = host->dev; 144 unsigned char *buf; 145 unsigned int pos = 0, val; 146 147 buf = kmap_atomic(pg) + off; 148 if (host->cmd_flags & DATA_CARRY) { 149 val = host->bounce_buf_data[0] | ((buf[pos++] << 8) & 0xff00); 150 writel(val, sock->addr + SOCK_MMCSD_DATA); 151 host->cmd_flags &= ~DATA_CARRY; 152 } 153 154 while (pos < cnt) { 155 val = buf[pos++]; 156 if (pos == cnt) { 157 host->bounce_buf_data[0] = val & 0xff; 158 host->cmd_flags |= DATA_CARRY; 159 break; 160 } 161 val |= (buf[pos++] << 8) & 0xff00; 162 writel(val, sock->addr + SOCK_MMCSD_DATA); 163 } 164 kunmap_atomic(buf - off); 165 } 166 167 static void tifm_sd_transfer_data(struct tifm_sd *host) 168 { 169 struct mmc_data *r_data = host->req->cmd->data; 170 struct scatterlist *sg = r_data->sg; 171 unsigned int off, cnt, t_size = TIFM_MMCSD_FIFO_SIZE * 2; 172 unsigned int p_off, p_cnt; 173 struct page *pg; 174 175 if (host->sg_pos == host->sg_len) 176 return; 177 while (t_size) { 178 cnt = sg[host->sg_pos].length - host->block_pos; 179 if (!cnt) { 180 host->block_pos = 0; 181 host->sg_pos++; 182 if (host->sg_pos == host->sg_len) { 183 if ((r_data->flags & MMC_DATA_WRITE) 184 && (host->cmd_flags & DATA_CARRY)) 185 writel(host->bounce_buf_data[0], 186 host->dev->addr 187 + SOCK_MMCSD_DATA); 188 189 return; 190 } 191 cnt = sg[host->sg_pos].length; 192 } 193 off = sg[host->sg_pos].offset + host->block_pos; 194 195 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT); 196 p_off = offset_in_page(off); 197 p_cnt = PAGE_SIZE - p_off; 198 p_cnt = min(p_cnt, cnt); 199 p_cnt = min(p_cnt, t_size); 200 201 if (r_data->flags & MMC_DATA_READ) 202 tifm_sd_read_fifo(host, pg, p_off, p_cnt); 203 else if (r_data->flags & MMC_DATA_WRITE) 204 tifm_sd_write_fifo(host, pg, p_off, p_cnt); 205 206 t_size -= p_cnt; 207 host->block_pos += p_cnt; 208 } 209 } 210 211 static void tifm_sd_copy_page(struct page *dst, unsigned int dst_off, 212 struct page *src, unsigned int src_off, 213 unsigned int count) 214 { 215 unsigned char *src_buf = kmap_atomic(src) + src_off; 216 unsigned char *dst_buf = kmap_atomic(dst) + dst_off; 217 218 memcpy(dst_buf, src_buf, count); 219 220 kunmap_atomic(dst_buf - dst_off); 221 kunmap_atomic(src_buf - src_off); 222 } 223 224 static void tifm_sd_bounce_block(struct tifm_sd *host, struct mmc_data *r_data) 225 { 226 struct scatterlist *sg = r_data->sg; 227 unsigned int t_size = r_data->blksz; 228 unsigned int off, cnt; 229 unsigned int p_off, p_cnt; 230 struct page *pg; 231 232 dev_dbg(&host->dev->dev, "bouncing block\n"); 233 while (t_size) { 234 cnt = sg[host->sg_pos].length - host->block_pos; 235 if (!cnt) { 236 host->block_pos = 0; 237 host->sg_pos++; 238 if (host->sg_pos == host->sg_len) 239 return; 240 cnt = sg[host->sg_pos].length; 241 } 242 off = sg[host->sg_pos].offset + host->block_pos; 243 244 pg = nth_page(sg_page(&sg[host->sg_pos]), off >> PAGE_SHIFT); 245 p_off = offset_in_page(off); 246 p_cnt = PAGE_SIZE - p_off; 247 p_cnt = min(p_cnt, cnt); 248 p_cnt = min(p_cnt, t_size); 249 250 if (r_data->flags & MMC_DATA_WRITE) 251 tifm_sd_copy_page(sg_page(&host->bounce_buf), 252 r_data->blksz - t_size, 253 pg, p_off, p_cnt); 254 else if (r_data->flags & MMC_DATA_READ) 255 tifm_sd_copy_page(pg, p_off, sg_page(&host->bounce_buf), 256 r_data->blksz - t_size, p_cnt); 257 258 t_size -= p_cnt; 259 host->block_pos += p_cnt; 260 } 261 } 262 263 static int tifm_sd_set_dma_data(struct tifm_sd *host, struct mmc_data *r_data) 264 { 265 struct tifm_dev *sock = host->dev; 266 unsigned int t_size = TIFM_DMA_TSIZE * r_data->blksz; 267 unsigned int dma_len, dma_blk_cnt, dma_off; 268 struct scatterlist *sg = NULL; 269 unsigned long flags; 270 271 if (host->sg_pos == host->sg_len) 272 return 1; 273 274 if (host->cmd_flags & DATA_CARRY) { 275 host->cmd_flags &= ~DATA_CARRY; 276 local_irq_save(flags); 277 tifm_sd_bounce_block(host, r_data); 278 local_irq_restore(flags); 279 if (host->sg_pos == host->sg_len) 280 return 1; 281 } 282 283 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]) - host->block_pos; 284 if (!dma_len) { 285 host->block_pos = 0; 286 host->sg_pos++; 287 if (host->sg_pos == host->sg_len) 288 return 1; 289 dma_len = sg_dma_len(&r_data->sg[host->sg_pos]); 290 } 291 292 if (dma_len < t_size) { 293 dma_blk_cnt = dma_len / r_data->blksz; 294 dma_off = host->block_pos; 295 host->block_pos += dma_blk_cnt * r_data->blksz; 296 } else { 297 dma_blk_cnt = TIFM_DMA_TSIZE; 298 dma_off = host->block_pos; 299 host->block_pos += t_size; 300 } 301 302 if (dma_blk_cnt) 303 sg = &r_data->sg[host->sg_pos]; 304 else if (dma_len) { 305 if (r_data->flags & MMC_DATA_WRITE) { 306 local_irq_save(flags); 307 tifm_sd_bounce_block(host, r_data); 308 local_irq_restore(flags); 309 } else 310 host->cmd_flags |= DATA_CARRY; 311 312 sg = &host->bounce_buf; 313 dma_off = 0; 314 dma_blk_cnt = 1; 315 } else 316 return 1; 317 318 dev_dbg(&sock->dev, "setting dma for %d blocks\n", dma_blk_cnt); 319 writel(sg_dma_address(sg) + dma_off, sock->addr + SOCK_DMA_ADDRESS); 320 if (r_data->flags & MMC_DATA_WRITE) 321 writel((dma_blk_cnt << 8) | TIFM_DMA_TX | TIFM_DMA_EN, 322 sock->addr + SOCK_DMA_CONTROL); 323 else 324 writel((dma_blk_cnt << 8) | TIFM_DMA_EN, 325 sock->addr + SOCK_DMA_CONTROL); 326 327 return 0; 328 } 329 330 static unsigned int tifm_sd_op_flags(struct mmc_command *cmd) 331 { 332 unsigned int rc = 0; 333 334 switch (mmc_resp_type(cmd)) { 335 case MMC_RSP_NONE: 336 rc |= TIFM_MMCSD_RSP_R0; 337 break; 338 case MMC_RSP_R1B: 339 rc |= TIFM_MMCSD_RSP_BUSY; 340 /* fall-through */ 341 case MMC_RSP_R1: 342 rc |= TIFM_MMCSD_RSP_R1; 343 break; 344 case MMC_RSP_R2: 345 rc |= TIFM_MMCSD_RSP_R2; 346 break; 347 case MMC_RSP_R3: 348 rc |= TIFM_MMCSD_RSP_R3; 349 break; 350 default: 351 BUG(); 352 } 353 354 switch (mmc_cmd_type(cmd)) { 355 case MMC_CMD_BC: 356 rc |= TIFM_MMCSD_CMD_BC; 357 break; 358 case MMC_CMD_BCR: 359 rc |= TIFM_MMCSD_CMD_BCR; 360 break; 361 case MMC_CMD_AC: 362 rc |= TIFM_MMCSD_CMD_AC; 363 break; 364 case MMC_CMD_ADTC: 365 rc |= TIFM_MMCSD_CMD_ADTC; 366 break; 367 default: 368 BUG(); 369 } 370 return rc; 371 } 372 373 static void tifm_sd_exec(struct tifm_sd *host, struct mmc_command *cmd) 374 { 375 struct tifm_dev *sock = host->dev; 376 unsigned int cmd_mask = tifm_sd_op_flags(cmd); 377 378 if (host->open_drain) 379 cmd_mask |= TIFM_MMCSD_ODTO; 380 381 if (cmd->data && (cmd->data->flags & MMC_DATA_READ)) 382 cmd_mask |= TIFM_MMCSD_READ; 383 384 dev_dbg(&sock->dev, "executing opcode 0x%x, arg: 0x%x, mask: 0x%x\n", 385 cmd->opcode, cmd->arg, cmd_mask); 386 387 writel((cmd->arg >> 16) & 0xffff, sock->addr + SOCK_MMCSD_ARG_HIGH); 388 writel(cmd->arg & 0xffff, sock->addr + SOCK_MMCSD_ARG_LOW); 389 writel(cmd->opcode | cmd_mask, sock->addr + SOCK_MMCSD_COMMAND); 390 } 391 392 static void tifm_sd_fetch_resp(struct mmc_command *cmd, struct tifm_dev *sock) 393 { 394 cmd->resp[0] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x1c) << 16) 395 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x18); 396 cmd->resp[1] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x14) << 16) 397 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x10); 398 cmd->resp[2] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x0c) << 16) 399 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x08); 400 cmd->resp[3] = (readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x04) << 16) 401 | readl(sock->addr + SOCK_MMCSD_RESPONSE + 0x00); 402 } 403 404 static void tifm_sd_check_status(struct tifm_sd *host) 405 { 406 struct tifm_dev *sock = host->dev; 407 struct mmc_command *cmd = host->req->cmd; 408 409 if (cmd->error) 410 goto finish_request; 411 412 if (!(host->cmd_flags & CMD_READY)) 413 return; 414 415 if (cmd->data) { 416 if (cmd->data->error) { 417 if ((host->cmd_flags & SCMD_ACTIVE) 418 && !(host->cmd_flags & SCMD_READY)) 419 return; 420 421 goto finish_request; 422 } 423 424 if (!(host->cmd_flags & BRS_READY)) 425 return; 426 427 if (!(host->no_dma || (host->cmd_flags & FIFO_READY))) 428 return; 429 430 if (cmd->data->flags & MMC_DATA_WRITE) { 431 if (host->req->stop) { 432 if (!(host->cmd_flags & SCMD_ACTIVE)) { 433 host->cmd_flags |= SCMD_ACTIVE; 434 writel(TIFM_MMCSD_EOFB 435 | readl(sock->addr 436 + SOCK_MMCSD_INT_ENABLE), 437 sock->addr 438 + SOCK_MMCSD_INT_ENABLE); 439 tifm_sd_exec(host, host->req->stop); 440 return; 441 } else { 442 if (!(host->cmd_flags & SCMD_READY) 443 || (host->cmd_flags & CARD_BUSY)) 444 return; 445 writel((~TIFM_MMCSD_EOFB) 446 & readl(sock->addr 447 + SOCK_MMCSD_INT_ENABLE), 448 sock->addr 449 + SOCK_MMCSD_INT_ENABLE); 450 } 451 } else { 452 if (host->cmd_flags & CARD_BUSY) 453 return; 454 writel((~TIFM_MMCSD_EOFB) 455 & readl(sock->addr 456 + SOCK_MMCSD_INT_ENABLE), 457 sock->addr + SOCK_MMCSD_INT_ENABLE); 458 } 459 } else { 460 if (host->req->stop) { 461 if (!(host->cmd_flags & SCMD_ACTIVE)) { 462 host->cmd_flags |= SCMD_ACTIVE; 463 tifm_sd_exec(host, host->req->stop); 464 return; 465 } else { 466 if (!(host->cmd_flags & SCMD_READY)) 467 return; 468 } 469 } 470 } 471 } 472 finish_request: 473 tasklet_schedule(&host->finish_tasklet); 474 } 475 476 /* Called from interrupt handler */ 477 static void tifm_sd_data_event(struct tifm_dev *sock) 478 { 479 struct tifm_sd *host; 480 unsigned int fifo_status = 0; 481 struct mmc_data *r_data = NULL; 482 483 spin_lock(&sock->lock); 484 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock)); 485 fifo_status = readl(sock->addr + SOCK_DMA_FIFO_STATUS); 486 dev_dbg(&sock->dev, "data event: fifo_status %x, flags %x\n", 487 fifo_status, host->cmd_flags); 488 489 if (host->req) { 490 r_data = host->req->cmd->data; 491 492 if (r_data && (fifo_status & TIFM_FIFO_READY)) { 493 if (tifm_sd_set_dma_data(host, r_data)) { 494 host->cmd_flags |= FIFO_READY; 495 tifm_sd_check_status(host); 496 } 497 } 498 } 499 500 writel(fifo_status, sock->addr + SOCK_DMA_FIFO_STATUS); 501 spin_unlock(&sock->lock); 502 } 503 504 /* Called from interrupt handler */ 505 static void tifm_sd_card_event(struct tifm_dev *sock) 506 { 507 struct tifm_sd *host; 508 unsigned int host_status = 0; 509 int cmd_error = 0; 510 struct mmc_command *cmd = NULL; 511 unsigned long flags; 512 513 spin_lock(&sock->lock); 514 host = mmc_priv((struct mmc_host*)tifm_get_drvdata(sock)); 515 host_status = readl(sock->addr + SOCK_MMCSD_STATUS); 516 dev_dbg(&sock->dev, "host event: host_status %x, flags %x\n", 517 host_status, host->cmd_flags); 518 519 if (host->req) { 520 cmd = host->req->cmd; 521 522 if (host_status & TIFM_MMCSD_ERRMASK) { 523 writel(host_status & TIFM_MMCSD_ERRMASK, 524 sock->addr + SOCK_MMCSD_STATUS); 525 if (host_status & TIFM_MMCSD_CTO) 526 cmd_error = -ETIMEDOUT; 527 else if (host_status & TIFM_MMCSD_CCRC) 528 cmd_error = -EILSEQ; 529 530 if (cmd->data) { 531 if (host_status & TIFM_MMCSD_DTO) 532 cmd->data->error = -ETIMEDOUT; 533 else if (host_status & TIFM_MMCSD_DCRC) 534 cmd->data->error = -EILSEQ; 535 } 536 537 writel(TIFM_FIFO_INT_SETALL, 538 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 539 writel(TIFM_DMA_RESET, sock->addr + SOCK_DMA_CONTROL); 540 541 if (host->req->stop) { 542 if (host->cmd_flags & SCMD_ACTIVE) { 543 host->req->stop->error = cmd_error; 544 host->cmd_flags |= SCMD_READY; 545 } else { 546 cmd->error = cmd_error; 547 host->cmd_flags |= SCMD_ACTIVE; 548 tifm_sd_exec(host, host->req->stop); 549 goto done; 550 } 551 } else 552 cmd->error = cmd_error; 553 } else { 554 if (host_status & (TIFM_MMCSD_EOC | TIFM_MMCSD_CERR)) { 555 if (!(host->cmd_flags & CMD_READY)) { 556 host->cmd_flags |= CMD_READY; 557 tifm_sd_fetch_resp(cmd, sock); 558 } else if (host->cmd_flags & SCMD_ACTIVE) { 559 host->cmd_flags |= SCMD_READY; 560 tifm_sd_fetch_resp(host->req->stop, 561 sock); 562 } 563 } 564 if (host_status & TIFM_MMCSD_BRS) 565 host->cmd_flags |= BRS_READY; 566 } 567 568 if (host->no_dma && cmd->data) { 569 if (host_status & TIFM_MMCSD_AE) 570 writel(host_status & TIFM_MMCSD_AE, 571 sock->addr + SOCK_MMCSD_STATUS); 572 573 if (host_status & (TIFM_MMCSD_AE | TIFM_MMCSD_AF 574 | TIFM_MMCSD_BRS)) { 575 local_irq_save(flags); 576 tifm_sd_transfer_data(host); 577 local_irq_restore(flags); 578 host_status &= ~TIFM_MMCSD_AE; 579 } 580 } 581 582 if (host_status & TIFM_MMCSD_EOFB) 583 host->cmd_flags &= ~CARD_BUSY; 584 else if (host_status & TIFM_MMCSD_CB) 585 host->cmd_flags |= CARD_BUSY; 586 587 tifm_sd_check_status(host); 588 } 589 done: 590 writel(host_status, sock->addr + SOCK_MMCSD_STATUS); 591 spin_unlock(&sock->lock); 592 } 593 594 static void tifm_sd_set_data_timeout(struct tifm_sd *host, 595 struct mmc_data *data) 596 { 597 struct tifm_dev *sock = host->dev; 598 unsigned int data_timeout = data->timeout_clks; 599 600 if (fixed_timeout) 601 return; 602 603 data_timeout += data->timeout_ns / 604 ((1000000000UL / host->clk_freq) * host->clk_div); 605 606 if (data_timeout < 0xffff) { 607 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO); 608 writel((~TIFM_MMCSD_DPE) 609 & readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG), 610 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG); 611 } else { 612 data_timeout = (data_timeout >> 10) + 1; 613 if (data_timeout > 0xffff) 614 data_timeout = 0; /* set to unlimited */ 615 writel(data_timeout, sock->addr + SOCK_MMCSD_DATA_TO); 616 writel(TIFM_MMCSD_DPE 617 | readl(sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG), 618 sock->addr + SOCK_MMCSD_SDIO_MODE_CONFIG); 619 } 620 } 621 622 static void tifm_sd_request(struct mmc_host *mmc, struct mmc_request *mrq) 623 { 624 struct tifm_sd *host = mmc_priv(mmc); 625 struct tifm_dev *sock = host->dev; 626 unsigned long flags; 627 struct mmc_data *r_data = mrq->cmd->data; 628 629 spin_lock_irqsave(&sock->lock, flags); 630 if (host->eject) { 631 mrq->cmd->error = -ENOMEDIUM; 632 goto err_out; 633 } 634 635 if (host->req) { 636 pr_err("%s : unfinished request detected\n", 637 dev_name(&sock->dev)); 638 mrq->cmd->error = -ETIMEDOUT; 639 goto err_out; 640 } 641 642 host->cmd_flags = 0; 643 host->block_pos = 0; 644 host->sg_pos = 0; 645 646 if (mrq->data && !is_power_of_2(mrq->data->blksz)) 647 host->no_dma = 1; 648 else 649 host->no_dma = no_dma ? 1 : 0; 650 651 if (r_data) { 652 tifm_sd_set_data_timeout(host, r_data); 653 654 if ((r_data->flags & MMC_DATA_WRITE) && !mrq->stop) 655 writel(TIFM_MMCSD_EOFB 656 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 657 sock->addr + SOCK_MMCSD_INT_ENABLE); 658 659 if (host->no_dma) { 660 writel(TIFM_MMCSD_BUFINT 661 | readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 662 sock->addr + SOCK_MMCSD_INT_ENABLE); 663 writel(((TIFM_MMCSD_FIFO_SIZE - 1) << 8) 664 | (TIFM_MMCSD_FIFO_SIZE - 1), 665 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 666 667 host->sg_len = r_data->sg_len; 668 } else { 669 sg_init_one(&host->bounce_buf, host->bounce_buf_data, 670 r_data->blksz); 671 672 if(1 != tifm_map_sg(sock, &host->bounce_buf, 1, 673 r_data->flags & MMC_DATA_WRITE 674 ? PCI_DMA_TODEVICE 675 : PCI_DMA_FROMDEVICE)) { 676 pr_err("%s : scatterlist map failed\n", 677 dev_name(&sock->dev)); 678 mrq->cmd->error = -ENOMEM; 679 goto err_out; 680 } 681 host->sg_len = tifm_map_sg(sock, r_data->sg, 682 r_data->sg_len, 683 r_data->flags 684 & MMC_DATA_WRITE 685 ? PCI_DMA_TODEVICE 686 : PCI_DMA_FROMDEVICE); 687 if (host->sg_len < 1) { 688 pr_err("%s : scatterlist map failed\n", 689 dev_name(&sock->dev)); 690 tifm_unmap_sg(sock, &host->bounce_buf, 1, 691 r_data->flags & MMC_DATA_WRITE 692 ? PCI_DMA_TODEVICE 693 : PCI_DMA_FROMDEVICE); 694 mrq->cmd->error = -ENOMEM; 695 goto err_out; 696 } 697 698 writel(TIFM_FIFO_INT_SETALL, 699 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 700 writel(ilog2(r_data->blksz) - 2, 701 sock->addr + SOCK_FIFO_PAGE_SIZE); 702 writel(TIFM_FIFO_ENABLE, 703 sock->addr + SOCK_FIFO_CONTROL); 704 writel(TIFM_FIFO_INTMASK, 705 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET); 706 707 if (r_data->flags & MMC_DATA_WRITE) 708 writel(TIFM_MMCSD_TXDE, 709 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 710 else 711 writel(TIFM_MMCSD_RXDE, 712 sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 713 714 tifm_sd_set_dma_data(host, r_data); 715 } 716 717 writel(r_data->blocks - 1, 718 sock->addr + SOCK_MMCSD_NUM_BLOCKS); 719 writel(r_data->blksz - 1, 720 sock->addr + SOCK_MMCSD_BLOCK_LEN); 721 } 722 723 host->req = mrq; 724 mod_timer(&host->timer, jiffies + host->timeout_jiffies); 725 writel(TIFM_CTRL_LED | readl(sock->addr + SOCK_CONTROL), 726 sock->addr + SOCK_CONTROL); 727 tifm_sd_exec(host, mrq->cmd); 728 spin_unlock_irqrestore(&sock->lock, flags); 729 return; 730 731 err_out: 732 spin_unlock_irqrestore(&sock->lock, flags); 733 mmc_request_done(mmc, mrq); 734 } 735 736 static void tifm_sd_end_cmd(unsigned long data) 737 { 738 struct tifm_sd *host = (struct tifm_sd*)data; 739 struct tifm_dev *sock = host->dev; 740 struct mmc_host *mmc = tifm_get_drvdata(sock); 741 struct mmc_request *mrq; 742 struct mmc_data *r_data = NULL; 743 unsigned long flags; 744 745 spin_lock_irqsave(&sock->lock, flags); 746 747 del_timer(&host->timer); 748 mrq = host->req; 749 host->req = NULL; 750 751 if (!mrq) { 752 pr_err(" %s : no request to complete?\n", 753 dev_name(&sock->dev)); 754 spin_unlock_irqrestore(&sock->lock, flags); 755 return; 756 } 757 758 r_data = mrq->cmd->data; 759 if (r_data) { 760 if (host->no_dma) { 761 writel((~TIFM_MMCSD_BUFINT) 762 & readl(sock->addr + SOCK_MMCSD_INT_ENABLE), 763 sock->addr + SOCK_MMCSD_INT_ENABLE); 764 } else { 765 tifm_unmap_sg(sock, &host->bounce_buf, 1, 766 (r_data->flags & MMC_DATA_WRITE) 767 ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); 768 tifm_unmap_sg(sock, r_data->sg, r_data->sg_len, 769 (r_data->flags & MMC_DATA_WRITE) 770 ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); 771 } 772 773 r_data->bytes_xfered = r_data->blocks 774 - readl(sock->addr + SOCK_MMCSD_NUM_BLOCKS) - 1; 775 r_data->bytes_xfered *= r_data->blksz; 776 r_data->bytes_xfered += r_data->blksz 777 - readl(sock->addr + SOCK_MMCSD_BLOCK_LEN) + 1; 778 } 779 780 writel((~TIFM_CTRL_LED) & readl(sock->addr + SOCK_CONTROL), 781 sock->addr + SOCK_CONTROL); 782 783 spin_unlock_irqrestore(&sock->lock, flags); 784 mmc_request_done(mmc, mrq); 785 } 786 787 static void tifm_sd_abort(struct timer_list *t) 788 { 789 struct tifm_sd *host = from_timer(host, t, timer); 790 791 pr_err("%s : card failed to respond for a long period of time " 792 "(%x, %x)\n", 793 dev_name(&host->dev->dev), host->req->cmd->opcode, host->cmd_flags); 794 795 tifm_eject(host->dev); 796 } 797 798 static void tifm_sd_ios(struct mmc_host *mmc, struct mmc_ios *ios) 799 { 800 struct tifm_sd *host = mmc_priv(mmc); 801 struct tifm_dev *sock = host->dev; 802 unsigned int clk_div1, clk_div2; 803 unsigned long flags; 804 805 spin_lock_irqsave(&sock->lock, flags); 806 807 dev_dbg(&sock->dev, "ios: clock = %u, vdd = %x, bus_mode = %x, " 808 "chip_select = %x, power_mode = %x, bus_width = %x\n", 809 ios->clock, ios->vdd, ios->bus_mode, ios->chip_select, 810 ios->power_mode, ios->bus_width); 811 812 if (ios->bus_width == MMC_BUS_WIDTH_4) { 813 writel(TIFM_MMCSD_4BBUS | readl(sock->addr + SOCK_MMCSD_CONFIG), 814 sock->addr + SOCK_MMCSD_CONFIG); 815 } else { 816 writel((~TIFM_MMCSD_4BBUS) 817 & readl(sock->addr + SOCK_MMCSD_CONFIG), 818 sock->addr + SOCK_MMCSD_CONFIG); 819 } 820 821 if (ios->clock) { 822 clk_div1 = 20000000 / ios->clock; 823 if (!clk_div1) 824 clk_div1 = 1; 825 826 clk_div2 = 24000000 / ios->clock; 827 if (!clk_div2) 828 clk_div2 = 1; 829 830 if ((20000000 / clk_div1) > ios->clock) 831 clk_div1++; 832 if ((24000000 / clk_div2) > ios->clock) 833 clk_div2++; 834 if ((20000000 / clk_div1) > (24000000 / clk_div2)) { 835 host->clk_freq = 20000000; 836 host->clk_div = clk_div1; 837 writel((~TIFM_CTRL_FAST_CLK) 838 & readl(sock->addr + SOCK_CONTROL), 839 sock->addr + SOCK_CONTROL); 840 } else { 841 host->clk_freq = 24000000; 842 host->clk_div = clk_div2; 843 writel(TIFM_CTRL_FAST_CLK 844 | readl(sock->addr + SOCK_CONTROL), 845 sock->addr + SOCK_CONTROL); 846 } 847 } else { 848 host->clk_div = 0; 849 } 850 host->clk_div &= TIFM_MMCSD_CLKMASK; 851 writel(host->clk_div 852 | ((~TIFM_MMCSD_CLKMASK) 853 & readl(sock->addr + SOCK_MMCSD_CONFIG)), 854 sock->addr + SOCK_MMCSD_CONFIG); 855 856 host->open_drain = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN); 857 858 /* chip_select : maybe later */ 859 //vdd 860 //power is set before probe / after remove 861 862 spin_unlock_irqrestore(&sock->lock, flags); 863 } 864 865 static int tifm_sd_ro(struct mmc_host *mmc) 866 { 867 int rc = 0; 868 struct tifm_sd *host = mmc_priv(mmc); 869 struct tifm_dev *sock = host->dev; 870 unsigned long flags; 871 872 spin_lock_irqsave(&sock->lock, flags); 873 if (TIFM_MMCSD_CARD_RO & readl(sock->addr + SOCK_PRESENT_STATE)) 874 rc = 1; 875 spin_unlock_irqrestore(&sock->lock, flags); 876 return rc; 877 } 878 879 static const struct mmc_host_ops tifm_sd_ops = { 880 .request = tifm_sd_request, 881 .set_ios = tifm_sd_ios, 882 .get_ro = tifm_sd_ro 883 }; 884 885 static int tifm_sd_initialize_host(struct tifm_sd *host) 886 { 887 int rc; 888 unsigned int host_status = 0; 889 struct tifm_dev *sock = host->dev; 890 891 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE); 892 host->clk_div = 61; 893 host->clk_freq = 20000000; 894 writel(TIFM_MMCSD_RESET, sock->addr + SOCK_MMCSD_SYSTEM_CONTROL); 895 writel(host->clk_div | TIFM_MMCSD_POWER, 896 sock->addr + SOCK_MMCSD_CONFIG); 897 898 /* wait up to 0.51 sec for reset */ 899 for (rc = 32; rc <= 256; rc <<= 1) { 900 if (1 & readl(sock->addr + SOCK_MMCSD_SYSTEM_STATUS)) { 901 rc = 0; 902 break; 903 } 904 msleep(rc); 905 } 906 907 if (rc) { 908 pr_err("%s : controller failed to reset\n", 909 dev_name(&sock->dev)); 910 return -ENODEV; 911 } 912 913 writel(0, sock->addr + SOCK_MMCSD_NUM_BLOCKS); 914 writel(host->clk_div | TIFM_MMCSD_POWER, 915 sock->addr + SOCK_MMCSD_CONFIG); 916 writel(TIFM_MMCSD_RXDE, sock->addr + SOCK_MMCSD_BUFFER_CONFIG); 917 918 // command timeout fixed to 64 clocks for now 919 writel(64, sock->addr + SOCK_MMCSD_COMMAND_TO); 920 writel(TIFM_MMCSD_INAB, sock->addr + SOCK_MMCSD_COMMAND); 921 922 for (rc = 16; rc <= 64; rc <<= 1) { 923 host_status = readl(sock->addr + SOCK_MMCSD_STATUS); 924 writel(host_status, sock->addr + SOCK_MMCSD_STATUS); 925 if (!(host_status & TIFM_MMCSD_ERRMASK) 926 && (host_status & TIFM_MMCSD_EOC)) { 927 rc = 0; 928 break; 929 } 930 msleep(rc); 931 } 932 933 if (rc) { 934 pr_err("%s : card not ready - probe failed on initialization\n", 935 dev_name(&sock->dev)); 936 return -ENODEV; 937 } 938 939 writel(TIFM_MMCSD_CERR | TIFM_MMCSD_BRS | TIFM_MMCSD_EOC 940 | TIFM_MMCSD_ERRMASK, 941 sock->addr + SOCK_MMCSD_INT_ENABLE); 942 943 return 0; 944 } 945 946 static int tifm_sd_probe(struct tifm_dev *sock) 947 { 948 struct mmc_host *mmc; 949 struct tifm_sd *host; 950 int rc = -EIO; 951 952 if (!(TIFM_SOCK_STATE_OCCUPIED 953 & readl(sock->addr + SOCK_PRESENT_STATE))) { 954 pr_warn("%s : card gone, unexpectedly\n", 955 dev_name(&sock->dev)); 956 return rc; 957 } 958 959 mmc = mmc_alloc_host(sizeof(struct tifm_sd), &sock->dev); 960 if (!mmc) 961 return -ENOMEM; 962 963 host = mmc_priv(mmc); 964 tifm_set_drvdata(sock, mmc); 965 host->dev = sock; 966 host->timeout_jiffies = msecs_to_jiffies(1000); 967 968 tasklet_init(&host->finish_tasklet, tifm_sd_end_cmd, 969 (unsigned long)host); 970 timer_setup(&host->timer, tifm_sd_abort, 0); 971 972 mmc->ops = &tifm_sd_ops; 973 mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; 974 mmc->caps = MMC_CAP_4_BIT_DATA; 975 mmc->f_min = 20000000 / 60; 976 mmc->f_max = 24000000; 977 978 mmc->max_blk_count = 2048; 979 mmc->max_segs = mmc->max_blk_count; 980 mmc->max_blk_size = min(TIFM_MMCSD_MAX_BLOCK_SIZE, PAGE_SIZE); 981 mmc->max_seg_size = mmc->max_blk_count * mmc->max_blk_size; 982 mmc->max_req_size = mmc->max_seg_size; 983 984 sock->card_event = tifm_sd_card_event; 985 sock->data_event = tifm_sd_data_event; 986 rc = tifm_sd_initialize_host(host); 987 988 if (!rc) 989 rc = mmc_add_host(mmc); 990 if (!rc) 991 return 0; 992 993 mmc_free_host(mmc); 994 return rc; 995 } 996 997 static void tifm_sd_remove(struct tifm_dev *sock) 998 { 999 struct mmc_host *mmc = tifm_get_drvdata(sock); 1000 struct tifm_sd *host = mmc_priv(mmc); 1001 unsigned long flags; 1002 1003 spin_lock_irqsave(&sock->lock, flags); 1004 host->eject = 1; 1005 writel(0, sock->addr + SOCK_MMCSD_INT_ENABLE); 1006 spin_unlock_irqrestore(&sock->lock, flags); 1007 1008 tasklet_kill(&host->finish_tasklet); 1009 1010 spin_lock_irqsave(&sock->lock, flags); 1011 if (host->req) { 1012 writel(TIFM_FIFO_INT_SETALL, 1013 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR); 1014 writel(0, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET); 1015 host->req->cmd->error = -ENOMEDIUM; 1016 if (host->req->stop) 1017 host->req->stop->error = -ENOMEDIUM; 1018 tasklet_schedule(&host->finish_tasklet); 1019 } 1020 spin_unlock_irqrestore(&sock->lock, flags); 1021 mmc_remove_host(mmc); 1022 dev_dbg(&sock->dev, "after remove\n"); 1023 1024 mmc_free_host(mmc); 1025 } 1026 1027 #ifdef CONFIG_PM 1028 1029 static int tifm_sd_suspend(struct tifm_dev *sock, pm_message_t state) 1030 { 1031 return 0; 1032 } 1033 1034 static int tifm_sd_resume(struct tifm_dev *sock) 1035 { 1036 struct mmc_host *mmc = tifm_get_drvdata(sock); 1037 struct tifm_sd *host = mmc_priv(mmc); 1038 int rc; 1039 1040 rc = tifm_sd_initialize_host(host); 1041 dev_dbg(&sock->dev, "resume initialize %d\n", rc); 1042 1043 if (rc) 1044 host->eject = 1; 1045 1046 return rc; 1047 } 1048 1049 #else 1050 1051 #define tifm_sd_suspend NULL 1052 #define tifm_sd_resume NULL 1053 1054 #endif /* CONFIG_PM */ 1055 1056 static struct tifm_device_id tifm_sd_id_tbl[] = { 1057 { TIFM_TYPE_SD }, { } 1058 }; 1059 1060 static struct tifm_driver tifm_sd_driver = { 1061 .driver = { 1062 .name = DRIVER_NAME, 1063 .owner = THIS_MODULE 1064 }, 1065 .id_table = tifm_sd_id_tbl, 1066 .probe = tifm_sd_probe, 1067 .remove = tifm_sd_remove, 1068 .suspend = tifm_sd_suspend, 1069 .resume = tifm_sd_resume 1070 }; 1071 1072 static int __init tifm_sd_init(void) 1073 { 1074 return tifm_register_driver(&tifm_sd_driver); 1075 } 1076 1077 static void __exit tifm_sd_exit(void) 1078 { 1079 tifm_unregister_driver(&tifm_sd_driver); 1080 } 1081 1082 MODULE_AUTHOR("Alex Dubov"); 1083 MODULE_DESCRIPTION("TI FlashMedia SD driver"); 1084 MODULE_LICENSE("GPL"); 1085 MODULE_DEVICE_TABLE(tifm, tifm_sd_id_tbl); 1086 MODULE_VERSION(DRIVER_VERSION); 1087 1088 module_init(tifm_sd_init); 1089 module_exit(tifm_sd_exit); 1090