drivers/memstick/host/r592.c

   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
  23 static bool r592_enable_dma = 1;
  24 static int debug;
  25
  26 static 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  */
  47 const char *memstick_debug_get_tpc_name(int tpc)
  48 {
  49         return tpc_names[tpc-1];
  50 }
  51 EXPORT_SYMBOL(memstick_debug_get_tpc_name);
  52
  53
  54 /* Read a register*/
  55 static inline u32 r592_read_reg(struct r592_device *dev, int address)
  56 {
  57         u32 value = readl(dev->mmio + address);
  58         dbg_reg("reg #%02d == 0x%08x", address, value);
  59         return value;
  60 }
  61
  62 /* Write a register */
  63 static inline void r592_write_reg(struct r592_device *dev,
  64                                                         int address, u32 value)
  65 {
  66         dbg_reg("reg #%02d <- 0x%08x", address, value);
  67         writel(value, dev->mmio + address);
  68 }
  69
  70 /* Reads a big endian DWORD register */
  71 static inline u32 r592_read_reg_raw_be(struct r592_device *dev, int address)
  72 {
  73         u32 value = __raw_readl(dev->mmio + address);
  74         dbg_reg("reg #%02d == 0x%08x", address, value);
  75         return be32_to_cpu(value);
  76 }
  77
  78 /* Writes a big endian DWORD register */
  79 static inline void r592_write_reg_raw_be(struct r592_device *dev,
  80                                                         int address, u32 value)
  81 {
  82         dbg_reg("reg #%02d <- 0x%08x", address, value);
  83         __raw_writel(cpu_to_be32(value), dev->mmio + address);
  84 }
  85
  86 /* Set specific bits in a register (little endian) */
  87 static inline void r592_set_reg_mask(struct r592_device *dev,
  88                                                         int address, u32 mask)
  89 {
  90         u32 reg = readl(dev->mmio + address);
  91         dbg_reg("reg #%02d |= 0x%08x (old =0x%08x)", address, mask, reg);
  92         writel(reg | mask , dev->mmio + address);
  93 }
  94
  95 /* Clear specific bits in a register (little endian) */
  96 static inline void r592_clear_reg_mask(struct r592_device *dev,
  97                                                 int address, u32 mask)
  98 {
  99         u32 reg = readl(dev->mmio + address);
 100         dbg_reg("reg #%02d &= 0x%08x (old = 0x%08x, mask = 0x%08x)",
 101                                                 address, ~mask, reg, mask);
 102         writel(reg & ~mask, dev->mmio + address);
 103 }
 104
 105
 106 /* Wait for status bits while checking for errors */
 107 static int r592_wait_status(struct r592_device *dev, u32 mask, u32 wanted_mask)
 108 {
 109         unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 110         u32 reg = r592_read_reg(dev, R592_STATUS);
 111
 112         if ((reg & mask) == wanted_mask)
 113                 return 0;
 114
 115         while (time_before(jiffies, timeout)) {
 116
 117                 reg = r592_read_reg(dev, R592_STATUS);
 118
 119                 if ((reg & mask) == wanted_mask)
 120                         return 0;
 121
 122                 if (reg & (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR))
 123                         return -EIO;
 124
 125                 cpu_relax();
 126         }
 127         return -ETIME;
 128 }
 129
 130
 131 /* Enable/disable device */
 132 static int r592_enable_device(struct r592_device *dev, bool enable)
 133 {
 134         dbg("%sabling the device", enable ? "en" : "dis");
 135
 136         if (enable) {
 137
 138                 /* Power up the card */
 139                 r592_write_reg(dev, R592_POWER, R592_POWER_0 | R592_POWER_1);
 140
 141                 /* Perform a reset */
 142                 r592_set_reg_mask(dev, R592_IO, R592_IO_RESET);
 143
 144                 msleep(100);
 145         } else
 146                 /* Power down the card */
 147                 r592_write_reg(dev, R592_POWER, 0);
 148
 149         return 0;
 150 }
 151
 152 /* Set serial/parallel mode */
 153 static int r592_set_mode(struct r592_device *dev, bool parallel_mode)
 154 {
 155         if (!parallel_mode) {
 156                 dbg("switching to serial mode");
 157
 158                 /* Set serial mode */
 159                 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_SERIAL);
 160
 161                 r592_clear_reg_mask(dev, R592_POWER, R592_POWER_20);
 162
 163         } else {
 164                 dbg("switching to parallel mode");
 165
 166                 /* This setting should be set _before_ switch TPC */
 167                 r592_set_reg_mask(dev, R592_POWER, R592_POWER_20);
 168
 169                 r592_clear_reg_mask(dev, R592_IO,
 170                         R592_IO_SERIAL1 | R592_IO_SERIAL2);
 171
 172                 /* Set the parallel mode now */
 173                 r592_write_reg(dev, R592_IO_MODE, R592_IO_MODE_PARALLEL);
 174         }
 175
 176         dev->parallel_mode = parallel_mode;
 177         return 0;
 178 }
 179
 180 /* Perform a controller reset without powering down the card */
 181 static void r592_host_reset(struct r592_device *dev)
 182 {
 183         r592_set_reg_mask(dev, R592_IO, R592_IO_RESET);
 184         msleep(100);
 185         r592_set_mode(dev, dev->parallel_mode);
 186 }
 187
 188 #ifdef CONFIG_PM_SLEEP
 189 /* Disable all hardware interrupts */
 190 static void r592_clear_interrupts(struct r592_device *dev)
 191 {
 192         /* Disable & ACK all interrupts */
 193         r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_ACK_MASK);
 194         r592_clear_reg_mask(dev, R592_REG_MSC, IRQ_ALL_EN_MASK);
 195 }
 196 #endif
 197
 198 /* Tests if there is an CRC error */
 199 static int r592_test_io_error(struct r592_device *dev)
 200 {
 201         if (!(r592_read_reg(dev, R592_STATUS) &
 202                 (R592_STATUS_SEND_ERR | R592_STATUS_RECV_ERR)))
 203                 return 0;
 204
 205         return -EIO;
 206 }
 207
 208 /* Ensure that FIFO is ready for use */
 209 static int r592_test_fifo_empty(struct r592_device *dev)
 210 {
 211         if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
 212                 return 0;
 213
 214         dbg("FIFO not ready, trying to reset the device");
 215         r592_host_reset(dev);
 216
 217         if (r592_read_reg(dev, R592_REG_MSC) & R592_REG_MSC_FIFO_EMPTY)
 218                 return 0;
 219
 220         message("FIFO still not ready, giving up");
 221         return -EIO;
 222 }
 223
 224 /* Activates the DMA transfer from to FIFO */
 225 static void r592_start_dma(struct r592_device *dev, bool is_write)
 226 {
 227         unsigned long flags;
 228         u32 reg;
 229         spin_lock_irqsave(&dev->irq_lock, flags);
 230
 231         /* Ack interrupts (just in case) + enable them */
 232         r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
 233         r592_set_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
 234
 235         /* Set DMA address */
 236         r592_write_reg(dev, R592_FIFO_DMA, sg_dma_address(&dev->req->sg));
 237
 238         /* Enable the DMA */
 239         reg = r592_read_reg(dev, R592_FIFO_DMA_SETTINGS);
 240         reg |= R592_FIFO_DMA_SETTINGS_EN;
 241
 242         if (!is_write)
 243                 reg |= R592_FIFO_DMA_SETTINGS_DIR;
 244         else
 245                 reg &= ~R592_FIFO_DMA_SETTINGS_DIR;
 246         r592_write_reg(dev, R592_FIFO_DMA_SETTINGS, reg);
 247
 248         spin_unlock_irqrestore(&dev->irq_lock, flags);
 249 }
 250
 251 /* Cleanups DMA related settings */
 252 static void r592_stop_dma(struct r592_device *dev, int error)
 253 {
 254         r592_clear_reg_mask(dev, R592_FIFO_DMA_SETTINGS,
 255                 R592_FIFO_DMA_SETTINGS_EN);
 256
 257         /* This is only a precation */
 258         r592_write_reg(dev, R592_FIFO_DMA,
 259                         dev->dummy_dma_page_physical_address);
 260
 261         r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_EN_MASK);
 262         r592_clear_reg_mask(dev, R592_REG_MSC, DMA_IRQ_ACK_MASK);
 263         dev->dma_error = error;
 264 }
 265
 266 /* Test if hardware supports DMA */
 267 static void r592_check_dma(struct r592_device *dev)
 268 {
 269         dev->dma_capable = r592_enable_dma &&
 270                 (r592_read_reg(dev, R592_FIFO_DMA_SETTINGS) &
 271                         R592_FIFO_DMA_SETTINGS_CAP);
 272 }
 273
 274 /* Transfers fifo contents in/out using DMA */
 275 static int r592_transfer_fifo_dma(struct r592_device *dev)
 276 {
 277         int len, sg_count;
 278         bool is_write;
 279
 280         if (!dev->dma_capable || !dev->req->long_data)
 281                 return -EINVAL;
 282
 283         len = dev->req->sg.length;
 284         is_write = dev->req->data_dir == WRITE;
 285
 286         if (len != R592_LFIFO_SIZE)
 287                 return -EINVAL;
 288
 289         dbg_verbose("doing dma transfer");
 290
 291         dev->dma_error = 0;
 292         reinit_completion(&dev->dma_done);
 293
 294         /* TODO: hidden assumption about nenth beeing always 1 */
 295         sg_count = dma_map_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
 296                               DMA_TO_DEVICE : DMA_FROM_DEVICE);
 297
 298         if (sg_count != 1 || sg_dma_len(&dev->req->sg) < R592_LFIFO_SIZE) {
 299                 message("problem in dma_map_sg");
 300                 return -EIO;
 301         }
 302
 303         r592_start_dma(dev, is_write);
 304
 305         /* Wait for DMA completion */
 306         if (!wait_for_completion_timeout(
 307                         &dev->dma_done, msecs_to_jiffies(1000))) {
 308                 message("DMA timeout");
 309                 r592_stop_dma(dev, -ETIMEDOUT);
 310         }
 311
 312         dma_unmap_sg(&dev->pci_dev->dev, &dev->req->sg, 1, is_write ?
 313                      DMA_TO_DEVICE : DMA_FROM_DEVICE);
 314
 315         return dev->dma_error;
 316 }
 317
 318 /*
 319  * Writes the FIFO in 4 byte chunks.
 320  * If length isn't 4 byte aligned, rest of the data if put to a fifo
 321  * to be written later
 322  * Use r592_flush_fifo_write to flush that fifo when writing for the
 323  * last time
 324  */
 325 static void r592_write_fifo_pio(struct r592_device *dev,
 326                                         unsigned char *buffer, int len)
 327 {
 328         /* flush spill from former write */
 329         if (!kfifo_is_empty(&dev->pio_fifo)) {
 330
 331                 u8 tmp[4] = {0};
 332                 int copy_len = kfifo_in(&dev->pio_fifo, buffer, len);
 333
 334                 if (!kfifo_is_full(&dev->pio_fifo))
 335                         return;
 336                 len -= copy_len;
 337                 buffer += copy_len;
 338
 339                 copy_len = kfifo_out(&dev->pio_fifo, tmp, 4);
 340                 WARN_ON(copy_len != 4);
 341                 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)tmp);
 342         }
 343
 344         WARN_ON(!kfifo_is_empty(&dev->pio_fifo));
 345
 346         /* write full dwords */
 347         while (len >= 4) {
 348                 r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
 349                 buffer += 4;
 350                 len -= 4;
 351         }
 352
 353         /* put remaining bytes to the spill */
 354         if (len)
 355                 kfifo_in(&dev->pio_fifo, buffer, len);
 356 }
 357
 358 /* Flushes the temporary FIFO used to make aligned DWORD writes */
 359 static void r592_flush_fifo_write(struct r592_device *dev)
 360 {
 361         int ret;
 362         u8 buffer[4] = { 0 };
 363
 364         if (kfifo_is_empty(&dev->pio_fifo))
 365                 return;
 366
 367         ret = kfifo_out(&dev->pio_fifo, buffer, 4);
 368         /* intentionally ignore __must_check return code */
 369         (void)ret;
 370         r592_write_reg_raw_be(dev, R592_FIFO_PIO, *(u32 *)buffer);
 371 }
 372
 373 /*
 374  * Read a fifo in 4 bytes chunks.
 375  * If input doesn't fit the buffer, it places bytes of last dword in spill
 376  * buffer, so that they don't get lost on last read, just throw these away.
 377  */
 378 static void r592_read_fifo_pio(struct r592_device *dev,
 379                                                 unsigned char *buffer, int len)
 380 {
 381         u8 tmp[4];
 382
 383         /* Read from last spill */
 384         if (!kfifo_is_empty(&dev->pio_fifo)) {
 385                 int bytes_copied =
 386                         kfifo_out(&dev->pio_fifo, buffer, min(4, len));
 387                 buffer += bytes_copied;
 388                 len -= bytes_copied;
 389
 390                 if (!kfifo_is_empty(&dev->pio_fifo))
 391                         return;
 392         }
 393
 394         /* Reads dwords from FIFO */
 395         while (len >= 4) {
 396                 *(u32 *)buffer = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
 397                 buffer += 4;
 398                 len -= 4;
 399         }
 400
 401         if (len) {
 402                 *(u32 *)tmp = r592_read_reg_raw_be(dev, R592_FIFO_PIO);
 403                 kfifo_in(&dev->pio_fifo, tmp, 4);
 404                 len -= kfifo_out(&dev->pio_fifo, buffer, len);
 405         }
 406
 407         WARN_ON(len);
 408         return;
 409 }
 410
 411 /* Transfers actual data using PIO. */
 412 static int r592_transfer_fifo_pio(struct r592_device *dev)
 413 {
 414         unsigned long flags;
 415
 416         bool is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
 417         struct sg_mapping_iter miter;
 418
 419         kfifo_reset(&dev->pio_fifo);
 420
 421         if (!dev->req->long_data) {
 422                 if (is_write) {
 423                         r592_write_fifo_pio(dev, dev->req->data,
 424                                                         dev->req->data_len);
 425                         r592_flush_fifo_write(dev);
 426                 } else
 427                         r592_read_fifo_pio(dev, dev->req->data,
 428                                                         dev->req->data_len);
 429                 return 0;
 430         }
 431
 432         local_irq_save(flags);
 433         sg_miter_start(&miter, &dev->req->sg, 1, SG_MITER_ATOMIC |
 434                 (is_write ? SG_MITER_FROM_SG : SG_MITER_TO_SG));
 435
 436         /* Do the transfer fifo<->memory*/
 437         while (sg_miter_next(&miter))
 438                 if (is_write)
 439                         r592_write_fifo_pio(dev, miter.addr, miter.length);
 440                 else
 441                         r592_read_fifo_pio(dev, miter.addr, miter.length);
 442
 443
 444         /* Write last few non aligned bytes*/
 445         if (is_write)
 446                 r592_flush_fifo_write(dev);
 447
 448         sg_miter_stop(&miter);
 449         local_irq_restore(flags);
 450         return 0;
 451 }
 452
 453 /* Executes one TPC (data is read/written from small or large fifo) */
 454 static void r592_execute_tpc(struct r592_device *dev)
 455 {
 456         bool is_write;
 457         int len, error;
 458         u32 status, reg;
 459
 460         if (!dev->req) {
 461                 message("BUG: tpc execution without request!");
 462                 return;
 463         }
 464
 465         is_write = dev->req->tpc >= MS_TPC_SET_RW_REG_ADRS;
 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");
 557 out:
 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 */
 564 static 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 */
 598 static 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, */
 617 static void r592_detect_timer(struct timer_list *t)
 618 {
 619         struct r592_device *dev = from_timer(dev, t, detect_timer);
 620         r592_update_card_detect(dev);
 621         memstick_detect_change(dev->host);
 622 }
 623
 624 /* Interrupt handler */
 625 static 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 */
 681 static 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 */
 711 static 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
 725 static const struct pci_device_id r592_pci_id_tbl[] = {
 726
 727         { PCI_VDEVICE(RICOH, 0x0592), },
 728         { },
 729 };
 730
 731 /* Main entry */
 732 static 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 = dma_set_mask(&pdev->dev, 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                 error = -ENOMEM;
 765                 goto error4;
 766         }
 767
 768         dev->irq = pdev->irq;
 769         spin_lock_init(&dev->irq_lock);
 770         spin_lock_init(&dev->io_thread_lock);
 771         init_completion(&dev->dma_done);
 772         INIT_KFIFO(dev->pio_fifo);
 773         timer_setup(&dev->detect_timer, r592_detect_timer, 0);
 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 = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
 789                 &dev->dummy_dma_page_physical_address, GFP_KERNEL);
 790         r592_stop_dma(dev , 0);
 791
 792         error = request_irq(dev->irq, &r592_irq, IRQF_SHARED,
 793                           DRV_NAME, dev);
 794         if (error)
 795                 goto error6;
 796
 797         r592_update_card_detect(dev);
 798         error = memstick_add_host(host);
 799         if (error)
 800                 goto error7;
 801
 802         message("driver successfully loaded");
 803         return 0;
 804 error7:
 805         free_irq(dev->irq, dev);
 806 error6:
 807         if (dev->dummy_dma_page)
 808                 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page,
 809                         dev->dummy_dma_page_physical_address);
 810
 811         kthread_stop(dev->io_thread);
 812 error5:
 813         iounmap(dev->mmio);
 814 error4:
 815         pci_release_regions(pdev);
 816 error3:
 817         pci_disable_device(pdev);
 818 error2:
 819         memstick_free_host(host);
 820 error1:
 821         return error;
 822 }
 823
 824 static void r592_remove(struct pci_dev *pdev)
 825 {
 826         int error = 0;
 827         struct r592_device *dev = pci_get_drvdata(pdev);
 828
 829         /* Stop the processing thread.
 830         That ensures that we won't take any more requests */
 831         kthread_stop(dev->io_thread);
 832
 833         r592_enable_device(dev, false);
 834
 835         while (!error && dev->req) {
 836                 dev->req->error = -ETIME;
 837                 error = memstick_next_req(dev->host, &dev->req);
 838         }
 839         memstick_remove_host(dev->host);
 840
 841         if (dev->dummy_dma_page)
 842                 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->dummy_dma_page,
 843                         dev->dummy_dma_page_physical_address);
 844
 845         free_irq(dev->irq, dev);
 846         iounmap(dev->mmio);
 847         pci_release_regions(pdev);
 848         pci_disable_device(pdev);
 849         memstick_free_host(dev->host);
 850 }
 851
 852 #ifdef CONFIG_PM_SLEEP
 853 static int r592_suspend(struct device *core_dev)
 854 {
 855         struct r592_device *dev = dev_get_drvdata(core_dev);
 856
 857         r592_clear_interrupts(dev);
 858         memstick_suspend_host(dev->host);
 859         del_timer_sync(&dev->detect_timer);
 860         return 0;
 861 }
 862
 863 static int r592_resume(struct device *core_dev)
 864 {
 865         struct r592_device *dev = dev_get_drvdata(core_dev);
 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 r592_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(r592_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");