1/* 2 * Copyright (C) 2010 - Maxim Levitsky 3 * driver for Ricoh memstick readers 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/freezer.h> 13#include <linux/jiffies.h> 14#include <linux/interrupt.h> 15#include <linux/pci.h> 16#include <linux/pci_ids.h> 17#include <linux/delay.h> 18#include <linux/slab.h> 19#include <linux/kthread.h> 20#include <linux/sched.h> 21#include <linux/highmem.h> 22#include <asm/byteorder.h> 23#include <linux/swab.h> 24#include "r592.h" 25 26static bool r592_enable_dma = 1; 27static int debug; 28 29static const char *tpc_names[] = { 30 "MS_TPC_READ_MG_STATUS", 31 "MS_TPC_READ_LONG_DATA", 32 "MS_TPC_READ_SHORT_DATA", 33 "MS_TPC_READ_REG", 34 "MS_TPC_READ_QUAD_DATA", 35 "INVALID", 36 "MS_TPC_GET_INT", 37 "MS_TPC_SET_RW_REG_ADRS", 38 "MS_TPC_EX_SET_CMD", 39 "MS_TPC_WRITE_QUAD_DATA", 40 "MS_TPC_WRITE_REG", 41 "MS_TPC_WRITE_SHORT_DATA", 42 "MS_TPC_WRITE_LONG_DATA", 43 "MS_TPC_SET_CMD", 44}; 45 46/** 47 * memstick_debug_get_tpc_name - debug helper that returns string for 48 * a TPC number 49 */ 50const char *memstick_debug_get_tpc_name(int tpc) 51{ 52 return tpc_names[tpc-1]; 53} 54EXPORT_SYMBOL(memstick_debug_get_tpc_name); 55 56 57/* Read a register*/ 58static inline u32 r592_read_reg(struct r592_device *dev, int address) 59{ 60 u32 value = readl(dev->mmio + address); 61 dbg_reg("reg #%02d == 0x%08x", address, value); 62 return value; 63} 64 65/* Write a register */ 66static inline void r592_write_reg(struct r592_device *dev, 67 int address, u32 value) 68{ 69 dbg_reg("reg #%02d <- 0x%08x", address, value); 70 writel(value, dev->mmio + address); 71} 72 73/* Reads a big endian DWORD register */ 74static inline u32 r592_read_reg_raw_be(struct r592_device *dev, int address) 75{ 76 u32 value = __raw_readl(dev->mmio + address); 77 dbg_reg("reg #%02d == 0x%08x", address, value); 78 return be32_to_cpu(value); 79} 80 81/* Writes a big endian DWORD register */ 82static inline void r592_write_reg_raw_be(struct r592_device *dev, 83 int address, u32 value) 84{ 85 dbg_reg("reg #%02d <- 0x%08x", address, value); 86 __raw_writel(cpu_to_be32(value), dev->mmio + address); 87} 88 89/* Set specific bits in a register (little endian) */ 90static inline void r592_set_reg_mask(struct r592_device *dev, 91 int address, u32 mask) 92{ 93 u32 reg = readl(dev->mmio + address); 94 dbg_reg("reg #%02d |= 0x%08x (old =0x%08x)", address, mask, reg); 95 writel(reg | mask , dev->mmio + address); 96} 97 98/* Clear specific bits in a register (little endian) */ 99static inline void r592_clear_reg_mask(struct r592_device *dev, 100 int address, u32 mask) 101{ 102 u32 reg = readl(dev->mmio + address); 103 dbg_reg("reg #%02d &= 0x%08x (old = 0x%08x, mask = 0x%08x)", 104 address, ~mask, reg, mask); 105 writel(reg & ~mask, dev->mmio + address); 106} 107 108 109/* Wait for status bits while checking for errors */ 110static int r592_wait_status(struct r592_device *dev, u32 mask, u32 wanted_mask) 111{ 112 unsigned long timeout = jiffies + msecs_to_jiffies(1000); 113 u32 reg = r592_read_reg(dev, R592_STATUS); 114 115 if ((reg & mask) == wanted_mask) 116 return 0; 117 118 while (time_before(jiffies, timeout)) { 119 120 reg = r592_read_reg(dev, R592_STATUS); 121 122 if ((reg & mask) == wanted_mask) 123 return 0; 124 125 if (reg & (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR)) 126 return -EIO; 127 128 cpu_relax(); 129 } 130 return -ETIME; 131} 132 133 134/* Enable/disable device */ 135static int r592_enable_device(struct r592_device *dev, bool enable) 136{ 137 dbg("%sabling the device", enable ? "en" : "dis"); 138 139 if (enable) { 140 141 /* Power up the card */ 142 r592_write_reg(dev, R592_POWER, R592_POWER_0 | R592_POWER_1); 143 144 /* Perform a reset */ 145 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET); 146 147 msleep(100); 148 } else 149 /* Power down the card */ 150 r592_write_reg(dev, R592_POWER, 0); 151 152 return 0; 153} 154 155/* Set serial/parallel mode */ 156static int r592_set_mode(struct r592_device *dev, bool parallel_mode) 157{ 158 if (!parallel_mode) { 159 dbg("switching to serial mode"); 160 161 /* Set serial mode */ 162 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_SERIAL); 163 164 r592_clear_reg_mask(dev, R592_POWER, R592_POWER_20); 165 166 } else { 167 dbg("switching to parallel mode"); 168 169 /* This setting should be set _before_ switch TPC */ 170 r592_set_reg_mask(dev, R592_POWER, R592_POWER_20); 171 172 r592_clear_reg_mask(dev, R592_IO, 173 R592_IO_SERIAL1 | R592_IO_SERIAL2); 174 175 /* Set the parallel mode now */ 176 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_PARALLEL); 177 } 178 179 dev->parallel_mode = parallel_mode; 180 return 0; 181} 182 183/* Perform a controller reset without powering down the card */ 184static void r592_host_reset(struct r592_device *dev) 185{ 186 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET); 187 msleep(100); 188 r592_set_mode(dev, dev->parallel_mode); 189} 190 191/* Disable all hardware interrupts */ 192static void r592_clear_interrupts(struct r592_device *dev) 193{ 194 /* Disable & ACK all interrupts */ 195 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_ACK_MASK); 196 r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_EN_MASK); 197} 198 199/* Tests if there is an CRC error */ 200static int r592_test_io_error(struct r592_device *dev) 201{ 202 if (!(r592_read_reg(dev, R592_STATUS) & 203 (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR))) 204 return 0; 205 206 return -EIO; 207} 208 209/* Ensure that FIFO is ready for use */ 210static int r592_test_fifo_empty(struct r592_device *dev) 211{ 212 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY) 213 return 0; 214 215 dbg("FIFO not ready, trying to reset the device"); 216 r592_host_reset(dev); 217 218 if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY) 219 return 0; 220 221 message("FIFO still not ready, giving up"); 222 return -EIO; 223} 224 225/* Activates the DMA transfer from to FIFO */ 226static void r592_start_dma(struct r592_device *dev, bool is_write) 227{ 228 unsigned long flags; 229 u32 reg; 230 spin_lock_irqsave(&dev->irq_lock, flags); 231 232 /* Ack interrupts (just in case) + enable them */ 233 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK); 234 r592_set_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK); 235 236 /* Set DMA address */ 237 r592_write_reg(dev, R592_FIFO_DMA, sg_dma_address(&dev->req->sg)); 238 239 /* Enable the DMA */ 240 reg = r592_read_reg(dev, R592_FIFO_DMA_SETTINGS); 241 reg |= R592_FIFO_DMA_SETTINGS_EN; 242 243 if (!is_write) 244 reg |= R592_FIFO_DMA_SETTINGS_DIR; 245 else 246 reg &= ~R592_FIFO_DMA_SETTINGS_DIR; 247 r592_write_reg(dev, R592_FIFO_DMA_SETTINGS, reg); 248 249 spin_unlock_irqrestore(&dev->irq_lock, flags); 250} 251 252/* Cleanups DMA related settings */ 253static void r592_stop_dma(struct r592_device *dev, int error) 254{ 255 r592_clear_reg_mask(dev, R592_FIFO_DMA_SETTINGS, 256 R592_FIFO_DMA_SETTINGS_EN); 257 258 /* This is only a precation */ 259 r592_write_reg(dev, R592_FIFO_DMA, 260 dev->dummy_dma_page_physical_address); 261 262 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK); 263 r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK); 264 dev->dma_error = error; 265} 266 267/* Test if hardware supports DMA */ 268static void r592_check_dma(struct r592_device *dev) 269{ 270 dev->dma_capable = r592_enable_dma && 271 (r592_read_reg(dev, R592_FIFO_DMA_SETTINGS) & 272 R592_FIFO_DMA_SETTINGS_CAP); 273} 274 275/* Transfers fifo contents in/out using DMA */ 276static int r592_transfer_fifo_dma(struct r592_device *dev) 277{ 278 int len, sg_count; 279 bool is_write; 280 281 if (!dev->dma_capable || !dev->req->long_data) 282 return -EINVAL; 283 284 len = dev->req->sg.length; 285 is_write = dev->req->data_dir == WRITE; 286 287 if (len != R592_LFIFO_SIZE) 288 return -EINVAL; 289 290 dbg_verbose("doing dma transfer"); 291 292 dev->dma_error = 0; 293 INIT_COMPLETION(dev->dma_done); 294 295 /* TODO: hidden assumption about nenth beeing always 1 */ 296 sg_count = dma_map_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ? 297 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); 298 299 if (sg_count != 1 || 300 (sg_dma_len(&dev->req->sg) < dev->req->sg.length)) { 301 message("problem in dma_map_sg"); 302 return -EIO; 303 } 304 305 r592_start_dma(dev, is_write); 306 307 /* Wait for DMA completion */ 308 if (!wait_for_completion_timeout( 309 &dev->dma_done, msecs_to_jiffies(1000))) { 310 message("DMA timeout"); 311 r592_stop_dma(dev, -ETIMEDOUT); 312 } 313 314 dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ? 315 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE); 316 317 318 return dev->dma_error; 319} 320 321/* 322 * Writes the FIFO in 4 byte chunks. 323 * If length isn't 4 byte aligned, rest of the data if put to a fifo 324 * to be written later 325 * Use r592_flush_fifo_write to flush that fifo when writing for the 326 * last time 327 */ 328static void r592_write_fifo_pio(struct r592_device *dev, 329 unsigned char *buffer, int len) 330{ 331 /* flush spill from former write */ 332 if (!kfifo_is_empty(&dev->pio_fifo)) { 333 334 u8 tmp[4] = {0}; 335 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len); 336 337 if (!kfifo_is_full(&dev->pio_fifo)) 338 return; 339 len -= copy_len; 340 buffer += copy_len; 341 342 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4); 343 WARN_ON(copy_len != 4); 344 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp); 345 } 346 347 WARN_ON(!kfifo_is_empty(&dev->pio_fifo)); 348 349 /* write full dwords */ 350 while (len >= 4) { 351 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer); 352 buffer += 4; 353 len -= 4; 354 } 355 356 /* put remaining bytes to the spill */ 357 if (len) 358 kfifo_in(&dev->pio_fifo, buffer, len); 359} 360 361/* Flushes the temporary FIFO used to make aligned DWORD writes */ 362static void r592_flush_fifo_write(struct r592_device *dev) 363{ 364 u8 buffer[4] = { 0 }; 365 int len; 366 367 if (kfifo_is_empty(&dev->pio_fifo)) 368 return; 369 370 len = kfifo_out(&dev->pio_fifo, buffer, 4); 371 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer); 372} 373 374/* 375 * Read a fifo in 4 bytes chunks. 376 * If input doesn't fit the buffer, it places bytes of last dword in spill 377 * buffer, so that they don't get lost on last read, just throw these away. 378 */ 379static void r592_read_fifo_pio(struct r592_device *dev, 380 unsigned char *buffer, int len) 381{ 382 u8 tmp[4]; 383 384 /* Read from last spill */ 385 if (!kfifo_is_empty(&dev->pio_fifo)) { 386 int bytes_copied = 387 kfifo_out(&dev->pio_fifo, buffer, min(4, len)); 388 buffer += bytes_copied; 389 len -= bytes_copied; 390 391 if (!kfifo_is_empty(&dev->pio_fifo)) 392 return; 393 } 394 395 /* Reads dwords from FIFO */ 396 while (len >= 4) { 397 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO); 398 buffer += 4; 399 len -= 4; 400 } 401 402 if (len) { 403 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO); 404 kfifo_in(&dev->pio_fifo, tmp, 4); 405 len -= kfifo_out(&dev->pio_fifo, buffer, len); 406 } 407 408 WARN_ON(len); 409 return; 410} 411 412/* Transfers actual data using PIO. */ 413static int r592_transfer_fifo_pio(struct r592_device *dev) 414{ 415 unsigned long flags; 416 417 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS; 418 struct sg_mapping_iter miter; 419 420 kfifo_reset(&dev->pio_fifo); 421 422 if (!dev->req->long_data) { 423 if (is_write) { 424 r592_write_fifo_pio(dev, dev->req->data, 425 dev->req->data_len); 426 r592_flush_fifo_write(dev); 427 } else 428 r592_read_fifo_pio(dev, dev->req->data, 429 dev->req->data_len); 430 return 0; 431 } 432 433 local_irq_save(flags); 434 sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC | 435 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG)); 436 437 /* Do the transfer fifo<->memory*/ 438 while (sg_miter_next(&miter)) 439 if (is_write) 440 r592_write_fifo_pio(dev, miter.addr, miter.length); 441 else 442 r592_read_fifo_pio(dev, miter.addr, miter.length); 443 444 445 /* Write last few non aligned bytes*/ 446 if (is_write) 447 r592_flush_fifo_write(dev); 448 449 sg_miter_stop(&miter); 450 local_irq_restore(flags); 451 return 0; 452} 453 454/* Executes one TPC (data is read/written from small or large fifo) */ 455static void r592_execute_tpc(struct r592_device *dev) 456{ 457 bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS; 458 int len, error; 459 u32 status, reg; 460 461 if (!dev->req) { 462 message("BUG: tpc execution without request!"); 463 return; 464 } 465 466 len = dev->req->long_data ? 467 dev->req->sg.length : dev->req->data_len; 468 469 /* Ensure that FIFO can hold the input data */ 470 if (len > R592_LFIFO_SIZE) { 471 message("IO: hardware doesn't support TPCs longer that 512"); 472 error = -ENOSYS; 473 goto out; 474 } 475 476 if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) { 477 dbg("IO: refusing to send TPC because card is absent"); 478 error = -ENODEV; 479 goto out; 480 } 481 482 dbg("IO: executing %s LEN=%d", 483 memstick_debug_get_tpc_name(dev->req->tpc), len); 484 485 /* Set IO direction */ 486 if (is_write) 487 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION); 488 else 489 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION); 490 491 492 error = r592_test_fifo_empty(dev); 493 if (error) 494 goto out; 495 496 /* Transfer write data */ 497 if (is_write) { 498 error = r592_transfer_fifo_dma(dev); 499 if (error == -EINVAL) 500 error = r592_transfer_fifo_pio(dev); 501 } 502 503 if (error) 504 goto out; 505 506 /* Trigger the TPC */ 507 reg = (len << R592_TPC_EXEC_LEN_SHIFT) | 508 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) | 509 R592_TPC_EXEC_BIG_FIFO; 510 511 r592_write_reg(dev, R592_TPC_EXEC, reg); 512 513 /* Wait for TPC completion */ 514 status = R592_STATUS_RDY; 515 if (dev->req->need_card_int) 516 status |= R592_STATUS_CED; 517 518 error = r592_wait_status(dev, status, status); 519 if (error) { 520 message("card didn't respond"); 521 goto out; 522 } 523 524 /* Test IO errors */ 525 error = r592_test_io_error(dev); 526 if (error) { 527 dbg("IO error"); 528 goto out; 529 } 530 531 /* Read data from FIFO */ 532 if (!is_write) { 533 error = r592_transfer_fifo_dma(dev); 534 if (error == -EINVAL) 535 error = r592_transfer_fifo_pio(dev); 536 } 537 538 /* read INT reg. This can be shortened with shifts, but that way 539 its more readable */ 540 if (dev->parallel_mode && dev->req->need_card_int) { 541 542 dev->req->int_reg = 0; 543 status = r592_read_reg(dev, R592_STATUS); 544 545 if (status & R592_STATUS_P_CMDNACK) 546 dev->req->int_reg |= MEMSTICK_INT_CMDNAK; 547 if (status & R592_STATUS_P_BREQ) 548 dev->req->int_reg |= MEMSTICK_INT_BREQ; 549 if (status & R592_STATUS_P_INTERR) 550 dev->req->int_reg |= MEMSTICK_INT_ERR; 551 if (status & R592_STATUS_P_CED) 552 dev->req->int_reg |= MEMSTICK_INT_CED; 553 } 554 555 if (error) 556 dbg("FIFO read error"); 557out: 558 dev->req->error = error; 559 r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED); 560 return; 561} 562 563/* Main request processing thread */ 564static int r592_process_thread(void *data) 565{ 566 int error; 567 struct r592_device *dev = (struct r592_device *)data; 568 unsigned long flags; 569 570 while (!kthread_should_stop()) { 571 spin_lock_irqsave(&dev->io_thread_lock, flags); 572 set_current_state(TASK_INTERRUPTIBLE); 573 error = memstick_next_req(dev->host, &dev->req); 574 spin_unlock_irqrestore(&dev->io_thread_lock, flags); 575 576 if (error) { 577 if (error == -ENXIO || error == -EAGAIN) { 578 dbg_verbose("IO: done IO, sleeping"); 579 } else { 580 dbg("IO: unknown error from " 581 "memstick_next_req %d", error); 582 } 583 584 if (kthread_should_stop()) 585 set_current_state(TASK_RUNNING); 586 587 schedule(); 588 } else { 589 set_current_state(TASK_RUNNING); 590 r592_execute_tpc(dev); 591 } 592 } 593 return 0; 594} 595 596/* Reprogram chip to detect change in card state */ 597/* eg, if card is detected, arm it to detect removal, and vice versa */ 598static void r592_update_card_detect(struct r592_device *dev) 599{ 600 u32 reg = r592_read_reg(dev, R592_REG_MSC); 601 bool card_detected = reg & R592_REG_MSC_PRSNT; 602 603 dbg("update card detect. card state: %s", card_detected ? 604 "present" : "absent"); 605 606 reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16); 607 608 if (card_detected) 609 reg |= (R592_REG_MSC_IRQ_REMOVE << 16); 610 else 611 reg |= (R592_REG_MSC_IRQ_INSERT << 16); 612 613 r592_write_reg(dev, R592_REG_MSC, reg); 614} 615 616/* Timer routine that fires 1 second after last card detection event, */ 617static void r592_detect_timer(long unsigned int data) 618{ 619 struct r592_device *dev = (struct r592_device *)data; 620 r592_update_card_detect(dev); 621 memstick_detect_change(dev->host); 622} 623 624/* Interrupt handler */ 625static irqreturn_t r592_irq(int irq, void *data) 626{ 627 struct r592_device *dev = (struct r592_device *)data; 628 irqreturn_t ret = IRQ_NONE; 629 u32 reg; 630 u16 irq_enable, irq_status; 631 unsigned long flags; 632 int error; 633 634 spin_lock_irqsave(&dev->irq_lock, flags); 635 636 reg = r592_read_reg(dev, R592_REG_MSC); 637 irq_enable = reg >> 16; 638 irq_status = reg & 0xFFFF; 639 640 /* Ack the interrupts */ 641 reg &= ~irq_status; 642 r592_write_reg(dev, R592_REG_MSC, reg); 643 644 /* Get the IRQ status minus bits that aren't enabled */ 645 irq_status &= (irq_enable); 646 647 /* Due to limitation of memstick core, we don't look at bits that 648 indicate that card was removed/inserted and/or present */ 649 if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) { 650 651 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT; 652 ret = IRQ_HANDLED; 653 654 message("IRQ: card %s", card_was_added ? "added" : "removed"); 655 656 mod_timer(&dev->detect_timer, 657 jiffies + msecs_to_jiffies(card_was_added ? 500 : 50)); 658 } 659 660 if (irq_status & 661 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) { 662 ret = IRQ_HANDLED; 663 664 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) { 665 message("IRQ: DMA error"); 666 error = -EIO; 667 } else { 668 dbg_verbose("IRQ: dma done"); 669 error = 0; 670 } 671 672 r592_stop_dma(dev, error); 673 complete(&dev->dma_done); 674 } 675 676 spin_unlock_irqrestore(&dev->irq_lock, flags); 677 return ret; 678} 679 680/* External inteface: set settings */ 681static int r592_set_param(struct memstick_host *host, 682 enum memstick_param param, int value) 683{ 684 struct r592_device *dev = memstick_priv(host); 685 686 switch (param) { 687 case MEMSTICK_POWER: 688 switch (value) { 689 case MEMSTICK_POWER_ON: 690 return r592_enable_device(dev, true); 691 case MEMSTICK_POWER_OFF: 692 return r592_enable_device(dev, false); 693 default: 694 return -EINVAL; 695 } 696 case MEMSTICK_INTERFACE: 697 switch (value) { 698 case MEMSTICK_SERIAL: 699 return r592_set_mode(dev, 0); 700 case MEMSTICK_PAR4: 701 return r592_set_mode(dev, 1); 702 default: 703 return -EINVAL; 704 } 705 default: 706 return -EINVAL; 707 } 708} 709 710/* External interface: submit requests */ 711static void r592_submit_req(struct memstick_host *host) 712{ 713 struct r592_device *dev = memstick_priv(host); 714 unsigned long flags; 715 716 if (dev->req) 717 return; 718 719 spin_lock_irqsave(&dev->io_thread_lock, flags); 720 if (wake_up_process(dev->io_thread)) 721 dbg_verbose("IO thread woken to process requests"); 722 spin_unlock_irqrestore(&dev->io_thread_lock, flags); 723} 724 725static const struct pci_device_id r592_pci_id_tbl[] = { 726 727 { PCI_VDEVICE(RICOH, 0x0592), }, 728 { }, 729}; 730 731/* Main entry */ 732static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id) 733{ 734 int error = -ENOMEM; 735 struct memstick_host *host; 736 struct r592_device *dev; 737 738 /* Allocate memory */ 739 host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev); 740 if (!host) 741 goto error1; 742 743 dev = memstick_priv(host); 744 dev->host = host; 745 dev->pci_dev = pdev; 746 pci_set_drvdata(pdev, dev); 747 748 /* pci initialization */ 749 error = pci_enable_device(pdev); 750 if (error) 751 goto error2; 752 753 pci_set_master(pdev); 754 error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); 755 if (error) 756 goto error3; 757 758 error = pci_request_regions(pdev, DRV_NAME); 759 if (error) 760 goto error3; 761 762 dev->mmio = pci_ioremap_bar(pdev, 0); 763 if (!dev->mmio) 764 goto error4; 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 setup_timer(&dev->detect_timer, 772 r592_detect_timer, (long unsigned int)dev); 773 774 /* Host initialization */ 775 host->caps = MEMSTICK_CAP_PAR4; 776 host->request = r592_submit_req; 777 host->set_param = r592_set_param; 778 r592_check_dma(dev); 779 780 dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io"); 781 if (IS_ERR(dev->io_thread)) { 782 error = PTR_ERR(dev->io_thread); 783 goto error5; 784 } 785 786 /* This is just a precation, so don't fail */ 787 dev->dummy_dma_page = pci_alloc_consistent(pdev, PAGE_SIZE, 788 &dev->dummy_dma_page_physical_address); 789 r592_stop_dma(dev , 0); 790 791 if (request_irq(dev->irq, &r592_irq, IRQF_SHARED, 792 DRV_NAME, dev)) 793 goto error6; 794 795 r592_update_card_detect(dev); 796 if (memstick_add_host(host)) 797 goto error7; 798 799 message("driver successfully loaded"); 800 return 0; 801error7: 802 free_irq(dev->irq, dev); 803error6: 804 if (dev->dummy_dma_page) 805 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page, 806 dev->dummy_dma_page_physical_address); 807 808 kthread_stop(dev->io_thread); 809error5: 810 iounmap(dev->mmio); 811error4: 812 pci_release_regions(pdev); 813error3: 814 pci_disable_device(pdev); 815error2: 816 memstick_free_host(host); 817error1: 818 return error; 819} 820 821static void r592_remove(struct pci_dev *pdev) 822{ 823 int error = 0; 824 struct r592_device *dev = pci_get_drvdata(pdev); 825 826 /* Stop the processing thread. 827 That ensures that we won't take any more requests */ 828 kthread_stop(dev->io_thread); 829 830 r592_enable_device(dev, false); 831 832 while (!error && dev->req) { 833 dev->req->error = -ETIME; 834 error = memstick_next_req(dev->host, &dev->req); 835 } 836 memstick_remove_host(dev->host); 837 838 free_irq(dev->irq, dev); 839 iounmap(dev->mmio); 840 pci_release_regions(pdev); 841 pci_disable_device(pdev); 842 memstick_free_host(dev->host); 843 844 if (dev->dummy_dma_page) 845 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page, 846 dev->dummy_dma_page_physical_address); 847} 848 849#ifdef CONFIG_PM 850static int r592_suspend(struct device *core_dev) 851{ 852 struct pci_dev *pdev = to_pci_dev(core_dev); 853 struct r592_device *dev = pci_get_drvdata(pdev); 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 pci_dev *pdev = to_pci_dev(core_dev); 864 struct r592_device *dev = pci_get_drvdata(pdev); 865 866 r592_clear_interrupts(dev); 867 r592_enable_device(dev, false); 868 memstick_resume_host(dev->host); 869 r592_update_card_detect(dev); 870 return 0; 871} 872 873SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume); 874#endif 875 876MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl); 877 878static struct pci_driver r852_pci_driver = { 879 .name = DRV_NAME, 880 .id_table = r592_pci_id_tbl, 881 .probe = r592_probe, 882 .remove = r592_remove, 883#ifdef CONFIG_PM 884 .driver.pm = &r592_pm_ops, 885#endif 886}; 887 888static __init int r592_module_init(void) 889{ 890 return pci_register_driver(&r852_pci_driver); 891} 892 893static void __exit r592_module_exit(void) 894{ 895 pci_unregister_driver(&r852_pci_driver); 896} 897 898module_init(r592_module_init); 899module_exit(r592_module_exit); 900 901module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO); 902MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)"); 903module_param(debug, int, S_IRUGO | S_IWUSR); 904MODULE_PARM_DESC(debug, "Debug level (0-3)"); 905 906MODULE_LICENSE("GPL"); 907MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); 908MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver"); 909