1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2010 - Maxim Levitsky 4 * driver for Ricoh memstick readers 5 */ 6 7#include <linux/kernel.h> 8#include <linux/module.h> 9#include <linux/freezer.h> 10#include <linux/jiffies.h> 11#include <linux/interrupt.h> 12#include <linux/pci.h> 13#include <linux/pci_ids.h> 14#include <linux/delay.h> 15#include <linux/slab.h> 16#include <linux/kthread.h> 17#include <linux/sched.h> 18#include <linux/highmem.h> 19#include <asm/byteorder.h> 20#include <linux/swab.h> 21#include "r592.h" 22 23static bool r592_enable_dma = 1; 24static int debug; 25 26static const char *tpc_names[] = { 27 "MS_TPC_READ_MG_STATUS", 28 "MS_TPC_READ_LONG_DATA", 29 "MS_TPC_READ_SHORT_DATA", 30 "MS_TPC_READ_REG", 31 "MS_TPC_READ_QUAD_DATA", 32 "INVALID", 33 "MS_TPC_GET_INT", 34 "MS_TPC_SET_RW_REG_ADRS", 35 "MS_TPC_EX_SET_CMD", 36 "MS_TPC_WRITE_QUAD_DATA", 37 "MS_TPC_WRITE_REG", 38 "MS_TPC_WRITE_SHORT_DATA", 39 "MS_TPC_WRITE_LONG_DATA", 40 "MS_TPC_SET_CMD", 41}; 42 43/** 44 * memstick_debug_get_tpc_name - debug helper that returns string for 45 * a TPC number 46 */ 47static __maybe_unused const char *memstick_debug_get_tpc_name(int tpc) 48{ 49 return tpc_names[tpc-1]; 50} 51 52/* Read a register*/ 53static inline u32 r592_read_reg(struct r592_device *dev, int address) 54{ 55 u32 value = readl(dev->mmio + address); 56 dbg_reg("reg #%02d == 0x%08x", address, value); 57 return value; 58} 59 60/* Write a register */ 61static inline void r592_write_reg(struct r592_device *dev, 62 int address, u32 value) 63{ 64 dbg_reg("reg #%02d <- 0x%08x", address, value); 65 writel(value, dev->mmio + address); 66} 67 68/* Reads a big endian DWORD register */ 69static inline u32 r592_read_reg_raw_be(struct r592_device *dev, int address) 70{ 71 u32 value = __raw_readl(dev->mmio + address); 72 dbg_reg("reg #%02d == 0x%08x", address, value); 73 return be32_to_cpu(value); 74} 75 76/* Writes a big endian DWORD register */ 77static inline void r592_write_reg_raw_be(struct r592_device *dev, 78 int address, u32 value) 79{ 80 dbg_reg("reg #%02d <- 0x%08x", address, value); 81 __raw_writel(cpu_to_be32(value), dev->mmio + address); 82} 83 84/* Set specific bits in a register (little endian) */ 85static inline void r592_set_reg_mask(struct r592_device *dev, 86 int address, u32 mask) 87{ 88 u32 reg = readl(dev->mmio + address); 89 dbg_reg("reg #%02d |= 0x%08x (old =0x%08x)", address, mask, reg); 90 writel(reg | mask , dev->mmio + address); 91} 92 93/* Clear specific bits in a register (little endian) */ 94static inline void r592_clear_reg_mask(struct r592_device *dev, 95 int address, u32 mask) 96{ 97 u32 reg = readl(dev->mmio + address); 98 dbg_reg("reg #%02d &= 0x%08x (old = 0x%08x, mask = 0x%08x)", 99 address, ~mask, reg, mask); 100 writel(reg & ~mask, dev->mmio + address); 101} 102 103 104/* Wait for status bits while checking for errors */ 105static int r592_wait_status(struct r592_device *dev, u32 mask, u32 wanted_mask) 106{ 107 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 108 u32 reg = r592_read_reg(dev, R592_STATUS); 109 110 if ((reg & mask) == wanted_mask) 111 return 0; 112 113 while (time_before(jiffies, timeout)) { 114 115 reg = r592_read_reg(dev, R592_STATUS); 116 117 if ((reg & mask) == wanted_mask) 118 return 0; 119 120 if (reg & (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR)) 121 return -EIO; 122 123 cpu_relax(); 124 } 125 return -ETIME; 126} 127 128 129/* Enable/disable device */ 130static int r592_enable_device(struct r592_device *dev, bool enable) 131{ 132 dbg("%sabling the device", enable ? "en" : "dis"); 133 134 if (enable) { 135 136 /* Power up the card */ 137 r592_write_reg(dev, R592_POWER, R592_POWER_0 | R592_POWER_1); 138 139 /* Perform a reset */ 140 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET); 141 142 msleep(100); 143 } else 144 /* Power down the card */ 145 r592_write_reg(dev, R592_POWER, 0); 146 147 return 0; 148} 149 150/* Set serial/parallel mode */ 151static int r592_set_mode(struct r592_device *dev, bool parallel_mode) 152{ 153 if (!parallel_mode) { 154 dbg("switching to serial mode"); 155 156 /* Set serial mode */ 157 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_SERIAL); 158 159 r592_clear_reg_mask(dev, R592_POWER, R592_POWER_20); 160 161 } else { 162 dbg("switching to parallel mode"); 163 164 /* This setting should be set _before_ switch TPC */ 165 r592_set_reg_mask(dev, R592_POWER, R592_POWER_20); 166 167 r592_clear_reg_mask(dev, R592_IO, 168 R592_IO_SERIAL1 | R592_IO_SERIAL2); 169 170 /* Set the parallel mode now */ 171 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_PARALLEL); 172 } 173 174 dev->parallel_mode = parallel_mode; 175 return 0; 176} 177 178/* Perform a controller reset without powering down the card */ 179static void r592_host_reset(struct r592_device *dev) 180{ 181 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET); 182 msleep(100); 183 r592_set_mode(dev, dev->parallel_mode); 184} 185 186#ifdef CONFIG_PM_SLEEP 187/* Disable all hardware interrupts */ 188static void r592_clear_interrupts(struct r592_device *dev) 189{ 190 /* Disable & ACK all interrupts */ 191 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_ACK_MASK); 192 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_EN_MASK); 193} 194#endif 195 196/* Tests if there is an CRC error */ 197static int r592_test_io_error(struct r592_device *dev) 198{ 199 if (!(r592_read_reg(dev, R592_STATUS) & 200 (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR))) 201 return 0; 202 203 return -EIO; 204} 205 206/* Ensure that FIFO is ready for use */ 207static int r592_test_fifo_empty(struct r592_device *dev) 208{ 209 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY) 210 return 0; 211 212 dbg("FIFO not ready, trying to reset the device"); 213 r592_host_reset(dev); 214 215 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY) 216 return 0; 217 218 message("FIFO still not ready, giving up"); 219 return -EIO; 220} 221 222/* Activates the DMA transfer from to FIFO */ 223static void r592_start_dma(struct r592_device *dev, bool is_write) 224{ 225 unsigned long flags; 226 u32 reg; 227 spin_lock_irqsave(&dev->irq_lock, flags); 228 229 /* Ack interrupts (just in case) + enable them */ 230 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK); 231 r592_set_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK); 232 233 /* Set DMA address */ 234 r592_write_reg(dev, R592_FIFO_DMA, sg_dma_address(&dev->req->sg)); 235 236 /* Enable the DMA */ 237 reg = r592_read_reg(dev, R592_FIFO_DMA_SETTINGS); 238 reg |= R592_FIFO_DMA_SETTINGS_EN; 239 240 if (!is_write) 241 reg |= R592_FIFO_DMA_SETTINGS_DIR; 242 else 243 reg &= ~R592_FIFO_DMA_SETTINGS_DIR; 244 r592_write_reg(dev, R592_FIFO_DMA_SETTINGS, reg); 245 246 spin_unlock_irqrestore(&dev->irq_lock, flags); 247} 248 249/* Cleanups DMA related settings */ 250static void r592_stop_dma(struct r592_device *dev, int error) 251{ 252 r592_clear_reg_mask(dev, R592_FIFO_DMA_SETTINGS, 253 R592_FIFO_DMA_SETTINGS_EN); 254 255 /* This is only a precation */ 256 r592_write_reg(dev, R592_FIFO_DMA, 257 dev->dummy_dma_page_physical_address); 258 259 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK); 260 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK); 261 dev->dma_error = error; 262} 263 264/* Test if hardware supports DMA */ 265static void r592_check_dma(struct r592_device *dev) 266{ 267 dev->dma_capable = r592_enable_dma && 268 (r592_read_reg(dev, R592_FIFO_DMA_SETTINGS) & 269 R592_FIFO_DMA_SETTINGS_CAP); 270} 271 272/* Transfers fifo contents in/out using DMA */ 273static int r592_transfer_fifo_dma(struct r592_device *dev) 274{ 275 int len, sg_count; 276 bool is_write; 277 278 if (!dev->dma_capable || !dev->req->long_data) 279 return -EINVAL; 280 281 len = dev->req->sg.length; 282 is_write = dev->req->data_dir == WRITE; 283 284 if (len != R592_LFIFO_SIZE) 285 return -EINVAL; 286 287 dbg_verbose("doing dma transfer"); 288 289 dev->dma_error = 0; 290 reinit_completion(&dev->dma_done); 291 292 /* TODO: hidden assumption about nenth beeing always 1 */ 293 sg_count = dma_map_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ? 294 DMA_TO_DEVICE : DMA_FROM_DEVICE); 295 296 if (sg_count != 1 || sg_dma_len(&dev->req->sg) < R592_LFIFO_SIZE) { 297 message("problem in dma_map_sg"); 298 return -EIO; 299 } 300 301 r592_start_dma(dev, is_write); 302 303 /* Wait for DMA completion */ 304 if (!wait_for_completion_timeout( 305 &dev->dma_done, msecs_to_jiffies(1000))) { 306 message("DMA timeout"); 307 r592_stop_dma(dev, -ETIMEDOUT); 308 } 309 310 dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ? 311 DMA_TO_DEVICE : DMA_FROM_DEVICE); 312 313 return dev->dma_error; 314} 315 316/* 317 * Writes the FIFO in 4 byte chunks. 318 * If length isn't 4 byte aligned, rest of the data if put to a fifo 319 * to be written later 320 * Use r592_flush_fifo_write to flush that fifo when writing for the 321 * last time 322 */ 323static void r592_write_fifo_pio(struct r592_device *dev, 324 unsigned char *buffer, int len) 325{ 326 /* flush spill from former write */ 327 if (!kfifo_is_empty(&dev->pio_fifo)) { 328 329 u8 tmp[4] = {0}; 330 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len); 331 332 if (!kfifo_is_full(&dev->pio_fifo)) 333 return; 334 len -= copy_len; 335 buffer += copy_len; 336 337 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4); 338 WARN_ON(copy_len != 4); 339 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp); 340 } 341 342 WARN_ON(!kfifo_is_empty(&dev->pio_fifo)); 343 344 /* write full dwords */ 345 while (len >= 4) { 346 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer); 347 buffer += 4; 348 len -= 4; 349 } 350 351 /* put remaining bytes to the spill */ 352 if (len) 353 kfifo_in(&dev->pio_fifo, buffer, len); 354} 355 356/* Flushes the temporary FIFO used to make aligned DWORD writes */ 357static void r592_flush_fifo_write(struct r592_device *dev) 358{ 359 int ret; 360 u8 buffer[4] = { 0 }; 361 362 if (kfifo_is_empty(&dev->pio_fifo)) 363 return; 364 365 ret = kfifo_out(&dev->pio_fifo, buffer, 4); 366 /* intentionally ignore __must_check return code */ 367 (void)ret; 368 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer); 369} 370 371/* 372 * Read a fifo in 4 bytes chunks. 373 * If input doesn't fit the buffer, it places bytes of last dword in spill 374 * buffer, so that they don't get lost on last read, just throw these away. 375 */ 376static void r592_read_fifo_pio(struct r592_device *dev, 377 unsigned char *buffer, int len) 378{ 379 u8 tmp[4]; 380 381 /* Read from last spill */ 382 if (!kfifo_is_empty(&dev->pio_fifo)) { 383 int bytes_copied = 384 kfifo_out(&dev->pio_fifo, buffer, min(4, len)); 385 buffer += bytes_copied; 386 len -= bytes_copied; 387 388 if (!kfifo_is_empty(&dev->pio_fifo)) 389 return; 390 } 391 392 /* Reads dwords from FIFO */ 393 while (len >= 4) { 394 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO); 395 buffer += 4; 396 len -= 4; 397 } 398 399 if (len) { 400 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO); 401 kfifo_in(&dev->pio_fifo, tmp, 4); 402 len -= kfifo_out(&dev->pio_fifo, buffer, len); 403 } 404 405 WARN_ON(len); 406 return; 407} 408 409/* Transfers actual data using PIO. */ 410static int r592_transfer_fifo_pio(struct r592_device *dev) 411{ 412 unsigned long flags; 413 414 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS; 415 struct sg_mapping_iter miter; 416 417 kfifo_reset(&dev->pio_fifo); 418 419 if (!dev->req->long_data) { 420 if (is_write) { 421 r592_write_fifo_pio(dev, dev->req->data, 422 dev->req->data_len); 423 r592_flush_fifo_write(dev); 424 } else 425 r592_read_fifo_pio(dev, dev->req->data, 426 dev->req->data_len); 427 return 0; 428 } 429 430 local_irq_save(flags); 431 sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC | 432 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG)); 433 434 /* Do the transfer fifo<->memory*/ 435 while (sg_miter_next(&miter)) 436 if (is_write) 437 r592_write_fifo_pio(dev, miter.addr, miter.length); 438 else 439 r592_read_fifo_pio(dev, miter.addr, miter.length); 440 441 442 /* Write last few non aligned bytes*/ 443 if (is_write) 444 r592_flush_fifo_write(dev); 445 446 sg_miter_stop(&miter); 447 local_irq_restore(flags); 448 return 0; 449} 450 451/* Executes one TPC (data is read/written from small or large fifo) */ 452static void r592_execute_tpc(struct r592_device *dev) 453{ 454 bool is_write; 455 int len, error; 456 u32 status, reg; 457 458 if (!dev->req) { 459 message("BUG: tpc execution without request!"); 460 return; 461 } 462 463 is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS; 464 len = dev->req->long_data ? 465 dev->req->sg.length : dev->req->data_len; 466 467 /* Ensure that FIFO can hold the input data */ 468 if (len > R592_LFIFO_SIZE) { 469 message("IO: hardware doesn't support TPCs longer that 512"); 470 error = -ENOSYS; 471 goto out; 472 } 473 474 if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) { 475 dbg("IO: refusing to send TPC because card is absent"); 476 error = -ENODEV; 477 goto out; 478 } 479 480 dbg("IO: executing %s LEN=%d", 481 memstick_debug_get_tpc_name(dev->req->tpc), len); 482 483 /* Set IO direction */ 484 if (is_write) 485 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION); 486 else 487 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION); 488 489 490 error = r592_test_fifo_empty(dev); 491 if (error) 492 goto out; 493 494 /* Transfer write data */ 495 if (is_write) { 496 error = r592_transfer_fifo_dma(dev); 497 if (error == -EINVAL) 498 error = r592_transfer_fifo_pio(dev); 499 } 500 501 if (error) 502 goto out; 503 504 /* Trigger the TPC */ 505 reg = (len << R592_TPC_EXEC_LEN_SHIFT) | 506 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) | 507 R592_TPC_EXEC_BIG_FIFO; 508 509 r592_write_reg(dev, R592_TPC_EXEC, reg); 510 511 /* Wait for TPC completion */ 512 status = R592_STATUS_RDY; 513 if (dev->req->need_card_int) 514 status |= R592_STATUS_CED; 515 516 error = r592_wait_status(dev, status, status); 517 if (error) { 518 message("card didn't respond"); 519 goto out; 520 } 521 522 /* Test IO errors */ 523 error = r592_test_io_error(dev); 524 if (error) { 525 dbg("IO error"); 526 goto out; 527 } 528 529 /* Read data from FIFO */ 530 if (!is_write) { 531 error = r592_transfer_fifo_dma(dev); 532 if (error == -EINVAL) 533 error = r592_transfer_fifo_pio(dev); 534 } 535 536 /* read INT reg. This can be shortened with shifts, but that way 537 its more readable */ 538 if (dev->parallel_mode && dev->req->need_card_int) { 539 540 dev->req->int_reg = 0; 541 status = r592_read_reg(dev, R592_STATUS); 542 543 if (status & R592_STATUS_P_CMDNACK) 544 dev->req->int_reg |= MEMSTICK_INT_CMDNAK; 545 if (status & R592_STATUS_P_BREQ) 546 dev->req->int_reg |= MEMSTICK_INT_BREQ; 547 if (status & R592_STATUS_P_INTERR) 548 dev->req->int_reg |= MEMSTICK_INT_ERR; 549 if (status & R592_STATUS_P_CED) 550 dev->req->int_reg |= MEMSTICK_INT_CED; 551 } 552 553 if (error) 554 dbg("FIFO read error"); 555out: 556 dev->req->error = error; 557 r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED); 558 return; 559} 560 561/* Main request processing thread */ 562static int r592_process_thread(void *data) 563{ 564 int error; 565 struct r592_device *dev = (struct r592_device *)data; 566 unsigned long flags; 567 568 while (!kthread_should_stop()) { 569 spin_lock_irqsave(&dev->io_thread_lock, flags); 570 set_current_state(TASK_INTERRUPTIBLE); 571 error = memstick_next_req(dev->host, &dev->req); 572 spin_unlock_irqrestore(&dev->io_thread_lock, flags); 573 574 if (error) { 575 if (error == -ENXIO || error == -EAGAIN) { 576 dbg_verbose("IO: done IO, sleeping"); 577 } else { 578 dbg("IO: unknown error from " 579 "memstick_next_req %d", error); 580 } 581 582 if (kthread_should_stop()) 583 set_current_state(TASK_RUNNING); 584 585 schedule(); 586 } else { 587 set_current_state(TASK_RUNNING); 588 r592_execute_tpc(dev); 589 } 590 } 591 return 0; 592} 593 594/* Reprogram chip to detect change in card state */ 595/* eg, if card is detected, arm it to detect removal, and vice versa */ 596static void r592_update_card_detect(struct r592_device *dev) 597{ 598 u32 reg = r592_read_reg(dev, R592_REG_MSC); 599 bool card_detected = reg & R592_REG_MSC_PRSNT; 600 601 dbg("update card detect. card state: %s", card_detected ? 602 "present" : "absent"); 603 604 reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16); 605 606 if (card_detected) 607 reg |= (R592_REG_MSC_IRQ_REMOVE << 16); 608 else 609 reg |= (R592_REG_MSC_IRQ_INSERT << 16); 610 611 r592_write_reg(dev, R592_REG_MSC, reg); 612} 613 614/* Timer routine that fires 1 second after last card detection event, */ 615static void r592_detect_timer(struct timer_list *t) 616{ 617 struct r592_device *dev = from_timer(dev, t, detect_timer); 618 r592_update_card_detect(dev); 619 memstick_detect_change(dev->host); 620} 621 622/* Interrupt handler */ 623static irqreturn_t r592_irq(int irq, void *data) 624{ 625 struct r592_device *dev = (struct r592_device *)data; 626 irqreturn_t ret = IRQ_NONE; 627 u32 reg; 628 u16 irq_enable, irq_status; 629 unsigned long flags; 630 int error; 631 632 spin_lock_irqsave(&dev->irq_lock, flags); 633 634 reg = r592_read_reg(dev, R592_REG_MSC); 635 irq_enable = reg >> 16; 636 irq_status = reg & 0xFFFF; 637 638 /* Ack the interrupts */ 639 reg &= ~irq_status; 640 r592_write_reg(dev, R592_REG_MSC, reg); 641 642 /* Get the IRQ status minus bits that aren't enabled */ 643 irq_status &= (irq_enable); 644 645 /* Due to limitation of memstick core, we don't look at bits that 646 indicate that card was removed/inserted and/or present */ 647 if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) { 648 649 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT; 650 ret = IRQ_HANDLED; 651 652 message("IRQ: card %s", card_was_added ? "added" : "removed"); 653 654 mod_timer(&dev->detect_timer, 655 jiffies + msecs_to_jiffies(card_was_added ? 500 : 50)); 656 } 657 658 if (irq_status & 659 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) { 660 ret = IRQ_HANDLED; 661 662 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) { 663 message("IRQ: DMA error"); 664 error = -EIO; 665 } else { 666 dbg_verbose("IRQ: dma done"); 667 error = 0; 668 } 669 670 r592_stop_dma(dev, error); 671 complete(&dev->dma_done); 672 } 673 674 spin_unlock_irqrestore(&dev->irq_lock, flags); 675 return ret; 676} 677 678/* External inteface: set settings */ 679static int r592_set_param(struct memstick_host *host, 680 enum memstick_param param, int value) 681{ 682 struct r592_device *dev = memstick_priv(host); 683 684 switch (param) { 685 case MEMSTICK_POWER: 686 switch (value) { 687 case MEMSTICK_POWER_ON: 688 return r592_enable_device(dev, true); 689 case MEMSTICK_POWER_OFF: 690 return r592_enable_device(dev, false); 691 default: 692 return -EINVAL; 693 } 694 case MEMSTICK_INTERFACE: 695 switch (value) { 696 case MEMSTICK_SERIAL: 697 return r592_set_mode(dev, 0); 698 case MEMSTICK_PAR4: 699 return r592_set_mode(dev, 1); 700 default: 701 return -EINVAL; 702 } 703 default: 704 return -EINVAL; 705 } 706} 707 708/* External interface: submit requests */ 709static void r592_submit_req(struct memstick_host *host) 710{ 711 struct r592_device *dev = memstick_priv(host); 712 unsigned long flags; 713 714 if (dev->req) 715 return; 716 717 spin_lock_irqsave(&dev->io_thread_lock, flags); 718 if (wake_up_process(dev->io_thread)) 719 dbg_verbose("IO thread woken to process requests"); 720 spin_unlock_irqrestore(&dev->io_thread_lock, flags); 721} 722 723static const struct pci_device_id r592_pci_id_tbl[] = { 724 725 { PCI_VDEVICE(RICOH, 0x0592), }, 726 { }, 727}; 728 729/* Main entry */ 730static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id) 731{ 732 int error = -ENOMEM; 733 struct memstick_host *host; 734 struct r592_device *dev; 735 736 /* Allocate memory */ 737 host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev); 738 if (!host) 739 goto error1; 740 741 dev = memstick_priv(host); 742 dev->host = host; 743 dev->pci_dev = pdev; 744 pci_set_drvdata(pdev, dev); 745 746 /* pci initialization */ 747 error = pci_enable_device(pdev); 748 if (error) 749 goto error2; 750 751 pci_set_master(pdev); 752 error = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 753 if (error) 754 goto error3; 755 756 error = pci_request_regions(pdev, DRV_NAME); 757 if (error) 758 goto error3; 759 760 dev->mmio = pci_ioremap_bar(pdev, 0); 761 if (!dev->mmio) { 762 error = -ENOMEM; 763 goto error4; 764 } 765 766 dev->irq = pdev->irq; 767 spin_lock_init(&dev->irq_lock); 768 spin_lock_init(&dev->io_thread_lock); 769 init_completion(&dev->dma_done); 770 INIT_KFIFO(dev->pio_fifo); 771 timer_setup(&dev->detect_timer, r592_detect_timer, 0); 772 773 /* Host initialization */ 774 host->caps = MEMSTICK_CAP_PAR4; 775 host->request = r592_submit_req; 776 host->set_param = r592_set_param; 777 r592_check_dma(dev); 778 779 dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io"); 780 if (IS_ERR(dev->io_thread)) { 781 error = PTR_ERR(dev->io_thread); 782 goto error5; 783 } 784 785 /* This is just a precation, so don't fail */ 786 dev->dummy_dma_page = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, 787 &dev->dummy_dma_page_physical_address, GFP_KERNEL); 788 r592_stop_dma(dev , 0); 789 790 error = request_irq(dev->irq, &r592_irq, IRQF_SHARED, 791 DRV_NAME, dev); 792 if (error) 793 goto error6; 794 795 r592_update_card_detect(dev); 796 error = memstick_add_host(host); 797 if (error) 798 goto error7; 799 800 message("driver successfully loaded"); 801 return 0; 802error7: 803 free_irq(dev->irq, dev); 804error6: 805 if (dev->dummy_dma_page) 806 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page, 807 dev->dummy_dma_page_physical_address); 808 809 kthread_stop(dev->io_thread); 810error5: 811 iounmap(dev->mmio); 812error4: 813 pci_release_regions(pdev); 814error3: 815 pci_disable_device(pdev); 816error2: 817 memstick_free_host(host); 818error1: 819 return error; 820} 821 822static void r592_remove(struct pci_dev *pdev) 823{ 824 int error = 0; 825 struct r592_device *dev = pci_get_drvdata(pdev); 826 827 /* Stop the processing thread. 828 That ensures that we won't take any more requests */ 829 kthread_stop(dev->io_thread); 830 del_timer_sync(&dev->detect_timer); 831 r592_enable_device(dev, false); 832 833 while (!error && dev->req) { 834 dev->req->error = -ETIME; 835 error = memstick_next_req(dev->host, &dev->req); 836 } 837 memstick_remove_host(dev->host); 838 839 if (dev->dummy_dma_page) 840 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page, 841 dev->dummy_dma_page_physical_address); 842 843 free_irq(dev->irq, dev); 844 iounmap(dev->mmio); 845 pci_release_regions(pdev); 846 pci_disable_device(pdev); 847 memstick_free_host(dev->host); 848} 849 850#ifdef CONFIG_PM_SLEEP 851static int r592_suspend(struct device *core_dev) 852{ 853 struct r592_device *dev = dev_get_drvdata(core_dev); 854 855 r592_clear_interrupts(dev); 856 memstick_suspend_host(dev->host); 857 del_timer_sync(&dev->detect_timer); 858 return 0; 859} 860 861static int r592_resume(struct device *core_dev) 862{ 863 struct r592_device *dev = dev_get_drvdata(core_dev); 864 865 r592_clear_interrupts(dev); 866 r592_enable_device(dev, false); 867 memstick_resume_host(dev->host); 868 r592_update_card_detect(dev); 869 return 0; 870} 871#endif 872 873static SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume); 874 875MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl); 876 877static struct pci_driver r592_pci_driver = { 878 .name = DRV_NAME, 879 .id_table = r592_pci_id_tbl, 880 .probe = r592_probe, 881 .remove = r592_remove, 882 .driver.pm = &r592_pm_ops, 883}; 884 885module_pci_driver(r592_pci_driver); 886 887module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO); 888MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)"); 889module_param(debug, int, S_IRUGO | S_IWUSR); 890MODULE_PARM_DESC(debug, "Debug level (0-3)"); 891 892MODULE_LICENSE("GPL"); 893MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); 894MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver"); 895