drivers/memstick/host/r592.c

   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
  26 static bool r592_enable_dma = 1;
  27 static int debug;
  28
  29 static 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  */
  50 const char *memstick_debug_get_tpc_name(int tpc)
  51 {
  52         return tpc_names[tpc-1];
  53 }
  54 EXPORT_SYMBOL(memstick_debug_get_tpc_name);
  55
  56
  57 /* Read a register*/
  58 static 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 */
  66 static 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 */
  74 static 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 */
  82 static 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) */
  90 static 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) */
  99 static 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 */
 110 static 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 */
 135 static 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 */
 156 static 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 */
 184 static 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 */
 192 static 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 */
 200 static 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 */
 210 static 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 */
 226 static 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 */
 253 static 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 */
 268 static 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 */
 276 static 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  */
 328 static 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 */
 362 static 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  */
 379 static 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. */
 413 static 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) */
 455 static void r592_execute_tpc(struct r592_device *dev)
 456 {
 457         bool is_write;
 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         is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
 467         len = dev->req->long_data ?
 468                 dev->req->sg.length : dev->req->data_len;
 469
 470         /* Ensure that FIFO can hold the input data */
 471         if (len > R592_LFIFO_SIZE) {
 472                 message("IO: hardware doesn't support TPCs longer that 512");
 473                 error = -ENOSYS;
 474                 goto out;
 475         }
 476
 477         if (!(r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_PRSNT)) {
 478                 dbg("IO: refusing to send TPC because card is absent");
 479                 error = -ENODEV;
 480                 goto out;
 481         }
 482
 483         dbg("IO: executing %s LEN=%d",
 484                         memstick_debug_get_tpc_name(dev->req->tpc), len);
 485
 486         /* Set IO direction */
 487         if (is_write)
 488                 r592_set_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
 489         else
 490                 r592_clear_reg_mask(dev, R592_IO, R592_IO_DIRECTION);
 491
 492
 493         error = r592_test_fifo_empty(dev);
 494         if (error)
 495                 goto out;
 496
 497         /* Transfer write data */
 498         if (is_write) {
 499                 error = r592_transfer_fifo_dma(dev);
 500                 if (error == -EINVAL)
 501                         error = r592_transfer_fifo_pio(dev);
 502         }
 503
 504         if (error)
 505                 goto out;
 506
 507         /* Trigger the TPC */
 508         reg = (len << R592_TPC_EXEC_LEN_SHIFT) |
 509                 (dev->req->tpc << R592_TPC_EXEC_TPC_SHIFT) |
 510                         R592_TPC_EXEC_BIG_FIFO;
 511
 512         r592_write_reg(dev, R592_TPC_EXEC, reg);
 513
 514         /* Wait for TPC completion */
 515         status = R592_STATUS_RDY;
 516         if (dev->req->need_card_int)
 517                 status |= R592_STATUS_CED;
 518
 519         error = r592_wait_status(dev, status, status);
 520         if (error) {
 521                 message("card didn't respond");
 522                 goto out;
 523         }
 524
 525         /* Test IO errors */
 526         error = r592_test_io_error(dev);
 527         if (error) {
 528                 dbg("IO error");
 529                 goto out;
 530         }
 531
 532         /* Read data from FIFO */
 533         if (!is_write) {
 534                 error = r592_transfer_fifo_dma(dev);
 535                 if (error == -EINVAL)
 536                         error = r592_transfer_fifo_pio(dev);
 537         }
 538
 539         /* read INT reg. This can be shortened with shifts, but that way
 540                 its more readable */
 541         if (dev->parallel_mode && dev->req->need_card_int) {
 542
 543                 dev->req->int_reg = 0;
 544                 status = r592_read_reg(dev, R592_STATUS);
 545
 546                 if (status & R592_STATUS_P_CMDNACK)
 547                         dev->req->int_reg |= MEMSTICK_INT_CMDNAK;
 548                 if (status & R592_STATUS_P_BREQ)
 549                         dev->req->int_reg |= MEMSTICK_INT_BREQ;
 550                 if (status & R592_STATUS_P_INTERR)
 551                         dev->req->int_reg |= MEMSTICK_INT_ERR;
 552                 if (status & R592_STATUS_P_CED)
 553                         dev->req->int_reg |= MEMSTICK_INT_CED;
 554         }
 555
 556         if (error)
 557                 dbg("FIFO read error");
 558 out:
 559         dev->req->error = error;
 560         r592_clear_reg_mask(dev, R592_REG_MSC, R592_REG_MSC_LED);
 561         return;
 562 }
 563
 564 /* Main request processing thread */
 565 static int r592_process_thread(void *data)
 566 {
 567         int error;
 568         struct r592_device *dev = (struct r592_device *)data;
 569         unsigned long flags;
 570
 571         while (!kthread_should_stop()) {
 572                 spin_lock_irqsave(&dev->io_thread_lock, flags);
 573                 set_current_state(TASK_INTERRUPTIBLE);
 574                 error = memstick_next_req(dev->host, &dev->req);
 575                 spin_unlock_irqrestore(&dev->io_thread_lock, flags);
 576
 577                 if (error) {
 578                         if (error == -ENXIO || error == -EAGAIN) {
 579                                 dbg_verbose("IO: done IO, sleeping");
 580                         } else {
 581                                 dbg("IO: unknown error from "
 582                                         "memstick_next_req %d", error);
 583                         }
 584
 585                         if (kthread_should_stop())
 586                                 set_current_state(TASK_RUNNING);
 587
 588                         schedule();
 589                 } else {
 590                         set_current_state(TASK_RUNNING);
 591                         r592_execute_tpc(dev);
 592                 }
 593         }
 594         return 0;
 595 }
 596
 597 /* Reprogram chip to detect change in card state */
 598 /* eg, if card is detected, arm it to detect removal, and vice versa */
 599 static void r592_update_card_detect(struct r592_device *dev)
 600 {
 601         u32 reg = r592_read_reg(dev, R592_REG_MSC);
 602         bool card_detected = reg & R592_REG_MSC_PRSNT;
 603
 604         dbg("update card detect. card state: %s", card_detected ?
 605                 "present" : "absent");
 606
 607         reg &= ~((R592_REG_MSC_IRQ_REMOVE | R592_REG_MSC_IRQ_INSERT) << 16);
 608
 609         if (card_detected)
 610                 reg |= (R592_REG_MSC_IRQ_REMOVE << 16);
 611         else
 612                 reg |= (R592_REG_MSC_IRQ_INSERT << 16);
 613
 614         r592_write_reg(dev, R592_REG_MSC, reg);
 615 }
 616
 617 /* Timer routine that fires 1 second after last card detection event, */
 618 static void r592_detect_timer(long unsigned int data)
 619 {
 620         struct r592_device *dev = (struct r592_device *)data;
 621         r592_update_card_detect(dev);
 622         memstick_detect_change(dev->host);
 623 }
 624
 625 /* Interrupt handler */
 626 static irqreturn_t r592_irq(int irq, void *data)
 627 {
 628         struct r592_device *dev = (struct r592_device *)data;
 629         irqreturn_t ret = IRQ_NONE;
 630         u32 reg;
 631         u16 irq_enable, irq_status;
 632         unsigned long flags;
 633         int error;
 634
 635         spin_lock_irqsave(&dev->irq_lock, flags);
 636
 637         reg = r592_read_reg(dev, R592_REG_MSC);
 638         irq_enable = reg >> 16;
 639         irq_status = reg & 0xFFFF;
 640
 641         /* Ack the interrupts */
 642         reg &= ~irq_status;
 643         r592_write_reg(dev, R592_REG_MSC, reg);
 644
 645         /* Get the IRQ status minus bits that aren't enabled */
 646         irq_status &= (irq_enable);
 647
 648         /* Due to limitation of memstick core, we don't look at bits that
 649                 indicate that card was removed/inserted and/or present */
 650         if (irq_status & (R592_REG_MSC_IRQ_INSERT | R592_REG_MSC_IRQ_REMOVE)) {
 651
 652                 bool card_was_added = irq_status & R592_REG_MSC_IRQ_INSERT;
 653                 ret = IRQ_HANDLED;
 654
 655                 message("IRQ: card %s", card_was_added ? "added" : "removed");
 656
 657                 mod_timer(&dev->detect_timer,
 658                         jiffies + msecs_to_jiffies(card_was_added ? 500 : 50));
 659         }
 660
 661         if (irq_status &
 662                 (R592_REG_MSC_FIFO_DMA_DONE | R592_REG_MSC_FIFO_DMA_ERR)) {
 663                 ret = IRQ_HANDLED;
 664
 665                 if (irq_status & R592_REG_MSC_FIFO_DMA_ERR) {
 666                         message("IRQ: DMA error");
 667                         error = -EIO;
 668                 } else {
 669                         dbg_verbose("IRQ: dma done");
 670                         error = 0;
 671                 }
 672
 673                 r592_stop_dma(dev, error);
 674                 complete(&dev->dma_done);
 675         }
 676
 677         spin_unlock_irqrestore(&dev->irq_lock, flags);
 678         return ret;
 679 }
 680
 681 /* External inteface: set settings */
 682 static int r592_set_param(struct memstick_host *host,
 683                         enum memstick_param param, int value)
 684 {
 685         struct r592_device *dev = memstick_priv(host);
 686
 687         switch (param) {
 688         case MEMSTICK_POWER:
 689                 switch (value) {
 690                 case MEMSTICK_POWER_ON:
 691                         return r592_enable_device(dev, true);
 692                 case MEMSTICK_POWER_OFF:
 693                         return r592_enable_device(dev, false);
 694                 default:
 695                         return -EINVAL;
 696                 }
 697         case MEMSTICK_INTERFACE:
 698                 switch (value) {
 699                 case MEMSTICK_SERIAL:
 700                         return r592_set_mode(dev, 0);
 701                 case MEMSTICK_PAR4:
 702                         return r592_set_mode(dev, 1);
 703                 default:
 704                         return -EINVAL;
 705                 }
 706         default:
 707                 return -EINVAL;
 708         }
 709 }
 710
 711 /* External interface: submit requests */
 712 static void r592_submit_req(struct memstick_host *host)
 713 {
 714         struct r592_device *dev = memstick_priv(host);
 715         unsigned long flags;
 716
 717         if (dev->req)
 718                 return;
 719
 720         spin_lock_irqsave(&dev->io_thread_lock, flags);
 721         if (wake_up_process(dev->io_thread))
 722                 dbg_verbose("IO thread woken to process requests");
 723         spin_unlock_irqrestore(&dev->io_thread_lock, flags);
 724 }
 725
 726 static const struct pci_device_id r592_pci_id_tbl[] = {
 727
 728         { PCI_VDEVICE(RICOH, 0x0592), },
 729         { },
 730 };
 731
 732 /* Main entry */
 733 static int r592_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 734 {
 735         int error = -ENOMEM;
 736         struct memstick_host *host;
 737         struct r592_device *dev;
 738
 739         /* Allocate memory */
 740         host = memstick_alloc_host(sizeof(struct r592_device), &pdev->dev);
 741         if (!host)
 742                 goto error1;
 743
 744         dev = memstick_priv(host);
 745         dev->host = host;
 746         dev->pci_dev = pdev;
 747         pci_set_drvdata(pdev, dev);
 748
 749         /* pci initialization */
 750         error = pci_enable_device(pdev);
 751         if (error)
 752                 goto error2;
 753
 754         pci_set_master(pdev);
 755         error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 756         if (error)
 757                 goto error3;
 758
 759         error = pci_request_regions(pdev, DRV_NAME);
 760         if (error)
 761                 goto error3;
 762
 763         dev->mmio = pci_ioremap_bar(pdev, 0);
 764         if (!dev->mmio)
 765                 goto error4;
 766
 767         dev->irq = pdev->irq;
 768         spin_lock_init(&dev->irq_lock);
 769         spin_lock_init(&dev->io_thread_lock);
 770         init_completion(&dev->dma_done);
 771         INIT_KFIFO(dev->pio_fifo);
 772         setup_timer(&dev->detect_timer,
 773                 r592_detect_timer, (long unsigned int)dev);
 774
 775         /* Host initialization */
 776         host->caps = MEMSTICK_CAP_PAR4;
 777         host->request = r592_submit_req;
 778         host->set_param = r592_set_param;
 779         r592_check_dma(dev);
 780
 781         dev->io_thread = kthread_run(r592_process_thread, dev, "r592_io");
 782         if (IS_ERR(dev->io_thread)) {
 783                 error = PTR_ERR(dev->io_thread);
 784                 goto error5;
 785         }
 786
 787         /* This is just a precation, so don't fail */
 788         dev->dummy_dma_page = pci_alloc_consistent(pdev, PAGE_SIZE,
 789                 &dev->dummy_dma_page_physical_address);
 790         r592_stop_dma(dev , 0);
 791
 792         if (request_irq(dev->irq, &r592_irq, IRQF_SHARED,
 793                           DRV_NAME, dev))
 794                 goto error6;
 795
 796         r592_update_card_detect(dev);
 797         if (memstick_add_host(host))
 798                 goto error7;
 799
 800         message("driver successfully loaded");
 801         return 0;
 802 error7:
 803         free_irq(dev->irq, dev);
 804 error6:
 805         if (dev->dummy_dma_page)
 806                 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
 807                         dev->dummy_dma_page_physical_address);
 808
 809         kthread_stop(dev->io_thread);
 810 error5:
 811         iounmap(dev->mmio);
 812 error4:
 813         pci_release_regions(pdev);
 814 error3:
 815         pci_disable_device(pdev);
 816 error2:
 817         memstick_free_host(host);
 818 error1:
 819         return error;
 820 }
 821
 822 static 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
 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         free_irq(dev->irq, dev);
 840         iounmap(dev->mmio);
 841         pci_release_regions(pdev);
 842         pci_disable_device(pdev);
 843         memstick_free_host(dev->host);
 844
 845         if (dev->dummy_dma_page)
 846                 pci_free_consistent(pdev, PAGE_SIZE, dev->dummy_dma_page,
 847                         dev->dummy_dma_page_physical_address);
 848 }
 849
 850 #ifdef CONFIG_PM_SLEEP
 851 static int r592_suspend(struct device *core_dev)
 852 {
 853         struct pci_dev *pdev = to_pci_dev(core_dev);
 854         struct r592_device *dev = pci_get_drvdata(pdev);
 855
 856         r592_clear_interrupts(dev);
 857         memstick_suspend_host(dev->host);
 858         del_timer_sync(&dev->detect_timer);
 859         return 0;
 860 }
 861
 862 static int r592_resume(struct device *core_dev)
 863 {
 864         struct pci_dev *pdev = to_pci_dev(core_dev);
 865         struct r592_device *dev = pci_get_drvdata(pdev);
 866
 867         r592_clear_interrupts(dev);
 868         r592_enable_device(dev, false);
 869         memstick_resume_host(dev->host);
 870         r592_update_card_detect(dev);
 871         return 0;
 872 }
 873 #endif
 874
 875 static SIMPLE_DEV_PM_OPS(r592_pm_ops, r592_suspend, r592_resume);
 876
 877 MODULE_DEVICE_TABLE(pci, r592_pci_id_tbl);
 878
 879 static struct pci_driver r852_pci_driver = {
 880         .name           = DRV_NAME,
 881         .id_table       = r592_pci_id_tbl,
 882         .probe          = r592_probe,
 883         .remove         = r592_remove,
 884         .driver.pm      = &r592_pm_ops,
 885 };
 886
 887 module_pci_driver(r852_pci_driver);
 888
 889 module_param_named(enable_dma, r592_enable_dma, bool, S_IRUGO);
 890 MODULE_PARM_DESC(enable_dma, "Enable usage of the DMA (default)");
 891 module_param(debug, int, S_IRUGO | S_IWUSR);
 892 MODULE_PARM_DESC(debug, "Debug level (0-3)");
 893
 894 MODULE_LICENSE("GPL");
 895 MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>");
 896 MODULE_DESCRIPTION("Ricoh R5C592 Memstick/Memstick PRO card reader driver");