kernel/drivers/staging/rts5208/rtsx.c

   1 /* Driver for Realtek PCI-Express card reader
   2  *
   3  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2, or (at your option) any
   8  * later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author:
  19  *   Wei WANG (wei_wang@realsil.com.cn)
  20  *   Micky Ching (micky_ching@realsil.com.cn)
  21  */
  22
  23 #include <linux/blkdev.h>
  24 #include <linux/kthread.h>
  25 #include <linux/sched.h>
  26 #include <linux/workqueue.h>
  27
  28 #include "rtsx.h"
  29 #include "ms.h"
  30 #include "sd.h"
  31 #include "xd.h"
  32
  33 MODULE_DESCRIPTION("Realtek PCI-Express card reader rts5208/rts5288 driver");
  34 MODULE_LICENSE("GPL");
  35
  36 static unsigned int delay_use = 1;
  37 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
  38 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
  39
  40 static int ss_en;
  41 module_param(ss_en, int, S_IRUGO | S_IWUSR);
  42 MODULE_PARM_DESC(ss_en, "enable selective suspend");
  43
  44 static int ss_interval = 50;
  45 module_param(ss_interval, int, S_IRUGO | S_IWUSR);
  46 MODULE_PARM_DESC(ss_interval, "Interval to enter ss state in seconds");
  47
  48 static int auto_delink_en;
  49 module_param(auto_delink_en, int, S_IRUGO | S_IWUSR);
  50 MODULE_PARM_DESC(auto_delink_en, "enable auto delink");
  51
  52 static unsigned char aspm_l0s_l1_en;
  53 module_param(aspm_l0s_l1_en, byte, S_IRUGO | S_IWUSR);
  54 MODULE_PARM_DESC(aspm_l0s_l1_en, "enable device aspm");
  55
  56 static int msi_en;
  57 module_param(msi_en, int, S_IRUGO | S_IWUSR);
  58 MODULE_PARM_DESC(msi_en, "enable msi");
  59
  60 static irqreturn_t rtsx_interrupt(int irq, void *dev_id);
  61
  62 /***********************************************************************
  63  * Host functions
  64  ***********************************************************************/
  65
  66 static const char *host_info(struct Scsi_Host *host)
  67 {
  68         return "SCSI emulation for PCI-Express Mass Storage devices";
  69 }
  70
  71 static int slave_alloc(struct scsi_device *sdev)
  72 {
  73         /*
  74          * Set the INQUIRY transfer length to 36.  We don't use any of
  75          * the extra data and many devices choke if asked for more or
  76          * less than 36 bytes.
  77          */
  78         sdev->inquiry_len = 36;
  79         return 0;
  80 }
  81
  82 static int slave_configure(struct scsi_device *sdev)
  83 {
  84         /* Scatter-gather buffers (all but the last) must have a length
  85          * divisible by the bulk maxpacket size.  Otherwise a data packet
  86          * would end up being short, causing a premature end to the data
  87          * transfer.  Since high-speed bulk pipes have a maxpacket size
  88          * of 512, we'll use that as the scsi device queue's DMA alignment
  89          * mask.  Guaranteeing proper alignment of the first buffer will
  90          * have the desired effect because, except at the beginning and
  91          * the end, scatter-gather buffers follow page boundaries. */
  92         blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
  93
  94         /* Set the SCSI level to at least 2.  We'll leave it at 3 if that's
  95          * what is originally reported.  We need this to avoid confusing
  96          * the SCSI layer with devices that report 0 or 1, but need 10-byte
  97          * commands (ala ATAPI devices behind certain bridges, or devices
  98          * which simply have broken INQUIRY data).
  99          *
 100          * NOTE: This means /dev/sg programs (ala cdrecord) will get the
 101          * actual information.  This seems to be the preference for
 102          * programs like that.
 103          *
 104          * NOTE: This also means that /proc/scsi/scsi and sysfs may report
 105          * the actual value or the modified one, depending on where the
 106          * data comes from.
 107          */
 108         if (sdev->scsi_level < SCSI_2)
 109                 sdev->scsi_level = sdev->sdev_target->scsi_level = SCSI_2;
 110
 111         return 0;
 112 }
 113
 114
 115 /***********************************************************************
 116  * /proc/scsi/ functions
 117  ***********************************************************************/
 118
 119 /* we use this macro to help us write into the buffer */
 120 #undef SPRINTF
 121 #define SPRINTF(args...) \
 122         do { if (pos < buffer+length) pos += sprintf(pos, ## args); } while (0)
 123
 124 /* queue a command */
 125 /* This is always called with scsi_lock(host) held */
 126 static int queuecommand_lck(struct scsi_cmnd *srb,
 127                         void (*done)(struct scsi_cmnd *))
 128 {
 129         struct rtsx_dev *dev = host_to_rtsx(srb->device->host);
 130         struct rtsx_chip *chip = dev->chip;
 131
 132         /* check for state-transition errors */
 133         if (chip->srb != NULL) {
 134                 dev_err(&dev->pci->dev, "Error: chip->srb = %p\n",
 135                         chip->srb);
 136                 return SCSI_MLQUEUE_HOST_BUSY;
 137         }
 138
 139         /* fail the command if we are disconnecting */
 140         if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
 141                 dev_info(&dev->pci->dev, "Fail command during disconnect\n");
 142                 srb->result = DID_NO_CONNECT << 16;
 143                 done(srb);
 144                 return 0;
 145         }
 146
 147         /* enqueue the command and wake up the control thread */
 148         srb->scsi_done = done;
 149         chip->srb = srb;
 150         complete(&dev->cmnd_ready);
 151
 152         return 0;
 153 }
 154
 155 static DEF_SCSI_QCMD(queuecommand)
 156
 157 /***********************************************************************
 158  * Error handling functions
 159  ***********************************************************************/
 160
 161 /* Command timeout and abort */
 162 static int command_abort(struct scsi_cmnd *srb)
 163 {
 164         struct Scsi_Host *host = srb->device->host;
 165         struct rtsx_dev *dev = host_to_rtsx(host);
 166         struct rtsx_chip *chip = dev->chip;
 167
 168         dev_info(&dev->pci->dev, "%s called\n", __func__);
 169
 170         scsi_lock(host);
 171
 172         /* Is this command still active? */
 173         if (chip->srb != srb) {
 174                 scsi_unlock(host);
 175                 dev_info(&dev->pci->dev, "-- nothing to abort\n");
 176                 return FAILED;
 177         }
 178
 179         rtsx_set_stat(chip, RTSX_STAT_ABORT);
 180
 181         scsi_unlock(host);
 182
 183         /* Wait for the aborted command to finish */
 184         wait_for_completion(&dev->notify);
 185
 186         return SUCCESS;
 187 }
 188
 189 /* This invokes the transport reset mechanism to reset the state of the
 190  * device */
 191 static int device_reset(struct scsi_cmnd *srb)
 192 {
 193         int result = 0;
 194         struct rtsx_dev *dev = host_to_rtsx(srb->device->host);
 195
 196         dev_info(&dev->pci->dev, "%s called\n", __func__);
 197
 198         return result < 0 ? FAILED : SUCCESS;
 199 }
 200
 201 /* Simulate a SCSI bus reset by resetting the device's USB port. */
 202 static int bus_reset(struct scsi_cmnd *srb)
 203 {
 204         int result = 0;
 205         struct rtsx_dev *dev = host_to_rtsx(srb->device->host);
 206
 207         dev_info(&dev->pci->dev, "%s called\n", __func__);
 208
 209         return result < 0 ? FAILED : SUCCESS;
 210 }
 211
 212
 213 /*
 214  * this defines our host template, with which we'll allocate hosts
 215  */
 216
 217 static struct scsi_host_template rtsx_host_template = {
 218         /* basic userland interface stuff */
 219         .name =                         CR_DRIVER_NAME,
 220         .proc_name =                    CR_DRIVER_NAME,
 221         .info =                         host_info,
 222
 223         /* command interface -- queued only */
 224         .queuecommand =                 queuecommand,
 225
 226         /* error and abort handlers */
 227         .eh_abort_handler =             command_abort,
 228         .eh_device_reset_handler =      device_reset,
 229         .eh_bus_reset_handler =         bus_reset,
 230
 231         /* queue commands only, only one command per LUN */
 232         .can_queue =                    1,
 233
 234         /* unknown initiator id */
 235         .this_id =                      -1,
 236
 237         .slave_alloc =                  slave_alloc,
 238         .slave_configure =              slave_configure,
 239
 240         /* lots of sg segments can be handled */
 241         .sg_tablesize =                 SG_ALL,
 242
 243         /* limit the total size of a transfer to 120 KB */
 244         .max_sectors =                  240,
 245
 246         /* merge commands... this seems to help performance, but
 247          * periodically someone should test to see which setting is more
 248          * optimal.
 249          */
 250         .use_clustering =               1,
 251
 252         /* emulated HBA */
 253         .emulated =                     1,
 254
 255         /* we do our own delay after a device or bus reset */
 256         .skip_settle_delay =            1,
 257
 258         /* module management */
 259         .module =                       THIS_MODULE
 260 };
 261
 262
 263 static int rtsx_acquire_irq(struct rtsx_dev *dev)
 264 {
 265         struct rtsx_chip *chip = dev->chip;
 266
 267         dev_info(&dev->pci->dev, "%s: chip->msi_en = %d, pci->irq = %d\n",
 268                  __func__, chip->msi_en, dev->pci->irq);
 269
 270         if (request_irq(dev->pci->irq, rtsx_interrupt,
 271                         chip->msi_en ? 0 : IRQF_SHARED,
 272                         CR_DRIVER_NAME, dev)) {
 273                 dev_err(&dev->pci->dev,
 274                         "rtsx: unable to grab IRQ %d, disabling device\n",
 275                         dev->pci->irq);
 276                 return -1;
 277         }
 278
 279         dev->irq = dev->pci->irq;
 280         pci_intx(dev->pci, !chip->msi_en);
 281
 282         return 0;
 283 }
 284
 285
 286 int rtsx_read_pci_cfg_byte(u8 bus, u8 dev, u8 func, u8 offset, u8 *val)
 287 {
 288         struct pci_dev *pdev;
 289         u8 data;
 290         u8 devfn = (dev << 3) | func;
 291
 292         pdev = pci_get_bus_and_slot(bus, devfn);
 293         if (!pdev)
 294                 return -1;
 295
 296         pci_read_config_byte(pdev, offset, &data);
 297         if (val)
 298                 *val = data;
 299
 300         return 0;
 301 }
 302
 303 #ifdef CONFIG_PM
 304 /*
 305  * power management
 306  */
 307 static int rtsx_suspend(struct pci_dev *pci, pm_message_t state)
 308 {
 309         struct rtsx_dev *dev = pci_get_drvdata(pci);
 310         struct rtsx_chip *chip;
 311
 312         if (!dev)
 313                 return 0;
 314
 315         /* lock the device pointers */
 316         mutex_lock(&(dev->dev_mutex));
 317
 318         chip = dev->chip;
 319
 320         rtsx_do_before_power_down(chip, PM_S3);
 321
 322         if (dev->irq >= 0) {
 323                 synchronize_irq(dev->irq);
 324                 free_irq(dev->irq, (void *)dev);
 325                 dev->irq = -1;
 326         }
 327
 328         if (chip->msi_en)
 329                 pci_disable_msi(pci);
 330
 331         pci_save_state(pci);
 332         pci_enable_wake(pci, pci_choose_state(pci, state), 1);
 333         pci_disable_device(pci);
 334         pci_set_power_state(pci, pci_choose_state(pci, state));
 335
 336         /* unlock the device pointers */
 337         mutex_unlock(&dev->dev_mutex);
 338
 339         return 0;
 340 }
 341
 342 static int rtsx_resume(struct pci_dev *pci)
 343 {
 344         struct rtsx_dev *dev = pci_get_drvdata(pci);
 345         struct rtsx_chip *chip;
 346
 347         if (!dev)
 348                 return 0;
 349
 350         chip = dev->chip;
 351
 352         /* lock the device pointers */
 353         mutex_lock(&(dev->dev_mutex));
 354
 355         pci_set_power_state(pci, PCI_D0);
 356         pci_restore_state(pci);
 357         if (pci_enable_device(pci) < 0) {
 358                 dev_err(&dev->pci->dev,
 359                         "%s: pci_enable_device failed, disabling device\n",
 360                         CR_DRIVER_NAME);
 361                 /* unlock the device pointers */
 362                 mutex_unlock(&dev->dev_mutex);
 363                 return -EIO;
 364         }
 365         pci_set_master(pci);
 366
 367         if (chip->msi_en) {
 368                 if (pci_enable_msi(pci) < 0)
 369                         chip->msi_en = 0;
 370         }
 371
 372         if (rtsx_acquire_irq(dev) < 0) {
 373                 /* unlock the device pointers */
 374                 mutex_unlock(&dev->dev_mutex);
 375                 return -EIO;
 376         }
 377
 378         rtsx_write_register(chip, HOST_SLEEP_STATE, 0x03, 0x00);
 379         rtsx_init_chip(chip);
 380
 381         /* unlock the device pointers */
 382         mutex_unlock(&dev->dev_mutex);
 383
 384         return 0;
 385 }
 386 #endif /* CONFIG_PM */
 387
 388 static void rtsx_shutdown(struct pci_dev *pci)
 389 {
 390         struct rtsx_dev *dev = pci_get_drvdata(pci);
 391         struct rtsx_chip *chip;
 392
 393         if (!dev)
 394                 return;
 395
 396         chip = dev->chip;
 397
 398         rtsx_do_before_power_down(chip, PM_S1);
 399
 400         if (dev->irq >= 0) {
 401                 synchronize_irq(dev->irq);
 402                 free_irq(dev->irq, (void *)dev);
 403                 dev->irq = -1;
 404         }
 405
 406         if (chip->msi_en)
 407                 pci_disable_msi(pci);
 408
 409         pci_disable_device(pci);
 410 }
 411
 412 static int rtsx_control_thread(void *__dev)
 413 {
 414         struct rtsx_dev *dev = __dev;
 415         struct rtsx_chip *chip = dev->chip;
 416         struct Scsi_Host *host = rtsx_to_host(dev);
 417
 418         for (;;) {
 419                 if (wait_for_completion_interruptible(&dev->cmnd_ready))
 420                         break;
 421
 422                 /* lock the device pointers */
 423                 mutex_lock(&(dev->dev_mutex));
 424
 425                 /* if the device has disconnected, we are free to exit */
 426                 if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
 427                         dev_info(&dev->pci->dev, "-- rtsx-control exiting\n");
 428                         mutex_unlock(&dev->dev_mutex);
 429                         break;
 430                 }
 431
 432                 /* lock access to the state */
 433                 scsi_lock(host);
 434
 435                 /* has the command aborted ? */
 436                 if (rtsx_chk_stat(chip, RTSX_STAT_ABORT)) {
 437                         chip->srb->result = DID_ABORT << 16;
 438                         goto SkipForAbort;
 439                 }
 440
 441                 scsi_unlock(host);
 442
 443                 /* reject the command if the direction indicator
 444                  * is UNKNOWN
 445                  */
 446                 if (chip->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 447                         dev_err(&dev->pci->dev, "UNKNOWN data direction\n");
 448                         chip->srb->result = DID_ERROR << 16;
 449                 }
 450
 451                 /* reject if target != 0 or if LUN is higher than
 452                  * the maximum known LUN
 453                  */
 454                 else if (chip->srb->device->id) {
 455                         dev_err(&dev->pci->dev, "Bad target number (%d:%d)\n",
 456                                 chip->srb->device->id,
 457                                 (u8)chip->srb->device->lun);
 458                         chip->srb->result = DID_BAD_TARGET << 16;
 459                 }
 460
 461                 else if (chip->srb->device->lun > chip->max_lun) {
 462                         dev_err(&dev->pci->dev, "Bad LUN (%d:%d)\n",
 463                                 chip->srb->device->id,
 464                                 (u8)chip->srb->device->lun);
 465                         chip->srb->result = DID_BAD_TARGET << 16;
 466                 }
 467
 468                 /* we've got a command, let's do it! */
 469                 else {
 470                         scsi_show_command(chip);
 471                         rtsx_invoke_transport(chip->srb, chip);
 472                 }
 473
 474                 /* lock access to the state */
 475                 scsi_lock(host);
 476
 477                 /* did the command already complete because of a disconnect? */
 478                 if (!chip->srb)
 479                         ;               /* nothing to do */
 480
 481                 /* indicate that the command is done */
 482                 else if (chip->srb->result != DID_ABORT << 16) {
 483                         chip->srb->scsi_done(chip->srb);
 484                 } else {
 485 SkipForAbort:
 486                         dev_err(&dev->pci->dev, "scsi command aborted\n");
 487                 }
 488
 489                 if (rtsx_chk_stat(chip, RTSX_STAT_ABORT)) {
 490                         complete(&(dev->notify));
 491
 492                         rtsx_set_stat(chip, RTSX_STAT_IDLE);
 493                 }
 494
 495                 /* finished working on this command */
 496                 chip->srb = NULL;
 497                 scsi_unlock(host);
 498
 499                 /* unlock the device pointers */
 500                 mutex_unlock(&dev->dev_mutex);
 501         } /* for (;;) */
 502
 503         /* notify the exit routine that we're actually exiting now
 504          *
 505          * complete()/wait_for_completion() is similar to up()/down(),
 506          * except that complete() is safe in the case where the structure
 507          * is getting deleted in a parallel mode of execution (i.e. just
 508          * after the down() -- that's necessary for the thread-shutdown
 509          * case.
 510          *
 511          * complete_and_exit() goes even further than this -- it is safe in
 512          * the case that the thread of the caller is going away (not just
 513          * the structure) -- this is necessary for the module-remove case.
 514          * This is important in preemption kernels, which transfer the flow
 515          * of execution immediately upon a complete().
 516          */
 517         complete_and_exit(&dev->control_exit, 0);
 518 }
 519
 520
 521 static int rtsx_polling_thread(void *__dev)
 522 {
 523         struct rtsx_dev *dev = __dev;
 524         struct rtsx_chip *chip = dev->chip;
 525         struct sd_info *sd_card = &(chip->sd_card);
 526         struct xd_info *xd_card = &(chip->xd_card);
 527         struct ms_info *ms_card = &(chip->ms_card);
 528
 529         sd_card->cleanup_counter = 0;
 530         xd_card->cleanup_counter = 0;
 531         ms_card->cleanup_counter = 0;
 532
 533         /* Wait until SCSI scan finished */
 534         wait_timeout((delay_use + 5) * 1000);
 535
 536         for (;;) {
 537
 538                 set_current_state(TASK_INTERRUPTIBLE);
 539                 schedule_timeout(msecs_to_jiffies(POLLING_INTERVAL));
 540
 541                 /* lock the device pointers */
 542                 mutex_lock(&(dev->dev_mutex));
 543
 544                 /* if the device has disconnected, we are free to exit */
 545                 if (rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
 546                         dev_info(&dev->pci->dev, "-- rtsx-polling exiting\n");
 547                         mutex_unlock(&dev->dev_mutex);
 548                         break;
 549                 }
 550
 551                 mutex_unlock(&dev->dev_mutex);
 552
 553                 mspro_polling_format_status(chip);
 554
 555                 /* lock the device pointers */
 556                 mutex_lock(&(dev->dev_mutex));
 557
 558                 rtsx_polling_func(chip);
 559
 560                 /* unlock the device pointers */
 561                 mutex_unlock(&dev->dev_mutex);
 562         }
 563
 564         complete_and_exit(&dev->polling_exit, 0);
 565 }
 566
 567 /*
 568  * interrupt handler
 569  */
 570 static irqreturn_t rtsx_interrupt(int irq, void *dev_id)
 571 {
 572         struct rtsx_dev *dev = dev_id;
 573         struct rtsx_chip *chip;
 574         int retval;
 575         u32 status;
 576
 577         if (dev)
 578                 chip = dev->chip;
 579         else
 580                 return IRQ_NONE;
 581
 582         if (!chip)
 583                 return IRQ_NONE;
 584
 585         spin_lock(&dev->reg_lock);
 586
 587         retval = rtsx_pre_handle_interrupt(chip);
 588         if (retval == STATUS_FAIL) {
 589                 spin_unlock(&dev->reg_lock);
 590                 if (chip->int_reg == 0xFFFFFFFF)
 591                         return IRQ_HANDLED;
 592                 return IRQ_NONE;
 593         }
 594
 595         status = chip->int_reg;
 596
 597         if (dev->check_card_cd) {
 598                 if (!(dev->check_card_cd & status)) {
 599                         /* card not exist, return TRANS_RESULT_FAIL */
 600                         dev->trans_result = TRANS_RESULT_FAIL;
 601                         if (dev->done)
 602                                 complete(dev->done);
 603                         goto Exit;
 604                 }
 605         }
 606
 607         if (status & (NEED_COMPLETE_INT | DELINK_INT)) {
 608                 if (status & (TRANS_FAIL_INT | DELINK_INT)) {
 609                         if (status & DELINK_INT)
 610                                 RTSX_SET_DELINK(chip);
 611                         dev->trans_result = TRANS_RESULT_FAIL;
 612                         if (dev->done)
 613                                 complete(dev->done);
 614                 } else if (status & TRANS_OK_INT) {
 615                         dev->trans_result = TRANS_RESULT_OK;
 616                         if (dev->done)
 617                                 complete(dev->done);
 618                 } else if (status & DATA_DONE_INT) {
 619                         dev->trans_result = TRANS_NOT_READY;
 620                         if (dev->done && (dev->trans_state == STATE_TRANS_SG))
 621                                 complete(dev->done);
 622                 }
 623         }
 624
 625 Exit:
 626         spin_unlock(&dev->reg_lock);
 627         return IRQ_HANDLED;
 628 }
 629
 630
 631 /* Release all our dynamic resources */
 632 static void rtsx_release_resources(struct rtsx_dev *dev)
 633 {
 634         dev_info(&dev->pci->dev, "-- %s\n", __func__);
 635
 636         /* Tell the control thread to exit.  The SCSI host must
 637          * already have been removed so it won't try to queue
 638          * any more commands.
 639          */
 640         dev_info(&dev->pci->dev, "-- sending exit command to thread\n");
 641         complete(&dev->cmnd_ready);
 642         if (dev->ctl_thread)
 643                 wait_for_completion(&dev->control_exit);
 644         if (dev->polling_thread)
 645                 wait_for_completion(&dev->polling_exit);
 646
 647         wait_timeout(200);
 648
 649         if (dev->rtsx_resv_buf) {
 650                 dev->chip->host_cmds_ptr = NULL;
 651                 dev->chip->host_sg_tbl_ptr = NULL;
 652         }
 653
 654         if (dev->irq > 0)
 655                 free_irq(dev->irq, (void *)dev);
 656         if (dev->chip->msi_en)
 657                 pci_disable_msi(dev->pci);
 658         if (dev->remap_addr)
 659                 iounmap(dev->remap_addr);
 660
 661         pci_disable_device(dev->pci);
 662         pci_release_regions(dev->pci);
 663
 664         rtsx_release_chip(dev->chip);
 665         kfree(dev->chip);
 666 }
 667
 668 /* First stage of disconnect processing: stop all commands and remove
 669  * the host */
 670 static void quiesce_and_remove_host(struct rtsx_dev *dev)
 671 {
 672         struct Scsi_Host *host = rtsx_to_host(dev);
 673         struct rtsx_chip *chip = dev->chip;
 674
 675         /* Prevent new transfers, stop the current command, and
 676          * interrupt a SCSI-scan or device-reset delay */
 677         mutex_lock(&dev->dev_mutex);
 678         scsi_lock(host);
 679         rtsx_set_stat(chip, RTSX_STAT_DISCONNECT);
 680         scsi_unlock(host);
 681         mutex_unlock(&dev->dev_mutex);
 682         wake_up(&dev->delay_wait);
 683         wait_for_completion(&dev->scanning_done);
 684
 685         /* Wait some time to let other threads exist */
 686         wait_timeout(100);
 687
 688         /* queuecommand won't accept any new commands and the control
 689          * thread won't execute a previously-queued command.  If there
 690          * is such a command pending, complete it with an error. */
 691         mutex_lock(&dev->dev_mutex);
 692         if (chip->srb) {
 693                 chip->srb->result = DID_NO_CONNECT << 16;
 694                 scsi_lock(host);
 695                 chip->srb->scsi_done(dev->chip->srb);
 696                 chip->srb = NULL;
 697                 scsi_unlock(host);
 698         }
 699         mutex_unlock(&dev->dev_mutex);
 700
 701         /* Now we own no commands so it's safe to remove the SCSI host */
 702         scsi_remove_host(host);
 703 }
 704
 705 /* Second stage of disconnect processing: deallocate all resources */
 706 static void release_everything(struct rtsx_dev *dev)
 707 {
 708         rtsx_release_resources(dev);
 709
 710         /* Drop our reference to the host; the SCSI core will free it
 711          * when the refcount becomes 0. */
 712         scsi_host_put(rtsx_to_host(dev));
 713 }
 714
 715 /* Thread to carry out delayed SCSI-device scanning */
 716 static int rtsx_scan_thread(void *__dev)
 717 {
 718         struct rtsx_dev *dev = (struct rtsx_dev *)__dev;
 719         struct rtsx_chip *chip = dev->chip;
 720
 721         /* Wait for the timeout to expire or for a disconnect */
 722         if (delay_use > 0) {
 723                 dev_info(&dev->pci->dev,
 724                          "%s: waiting for device to settle before scanning\n",
 725                          CR_DRIVER_NAME);
 726                 wait_event_interruptible_timeout(dev->delay_wait,
 727                                 rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT),
 728                                 delay_use * HZ);
 729         }
 730
 731         /* If the device is still connected, perform the scanning */
 732         if (!rtsx_chk_stat(chip, RTSX_STAT_DISCONNECT)) {
 733                 scsi_scan_host(rtsx_to_host(dev));
 734                 dev_info(&dev->pci->dev, "%s: device scan complete\n",
 735                          CR_DRIVER_NAME);
 736
 737                 /* Should we unbind if no devices were detected? */
 738         }
 739
 740         complete_and_exit(&dev->scanning_done, 0);
 741 }
 742
 743 static void rtsx_init_options(struct rtsx_chip *chip)
 744 {
 745         chip->vendor_id = chip->rtsx->pci->vendor;
 746         chip->product_id = chip->rtsx->pci->device;
 747         chip->adma_mode = 1;
 748         chip->lun_mc = 0;
 749         chip->driver_first_load = 1;
 750 #ifdef HW_AUTO_SWITCH_SD_BUS
 751         chip->sdio_in_charge = 0;
 752 #endif
 753
 754         chip->mspro_formatter_enable = 1;
 755         chip->ignore_sd = 0;
 756         chip->use_hw_setting = 0;
 757         chip->lun_mode = DEFAULT_SINGLE;
 758         chip->auto_delink_en = auto_delink_en;
 759         chip->ss_en = ss_en;
 760         chip->ss_idle_period = ss_interval * 1000;
 761         chip->remote_wakeup_en = 0;
 762         chip->aspm_l0s_l1_en = aspm_l0s_l1_en;
 763         chip->dynamic_aspm = 1;
 764         chip->fpga_sd_sdr104_clk = CLK_200;
 765         chip->fpga_sd_ddr50_clk = CLK_100;
 766         chip->fpga_sd_sdr50_clk = CLK_100;
 767         chip->fpga_sd_hs_clk = CLK_100;
 768         chip->fpga_mmc_52m_clk = CLK_80;
 769         chip->fpga_ms_hg_clk = CLK_80;
 770         chip->fpga_ms_4bit_clk = CLK_80;
 771         chip->fpga_ms_1bit_clk = CLK_40;
 772         chip->asic_sd_sdr104_clk = 203;
 773         chip->asic_sd_sdr50_clk = 98;
 774         chip->asic_sd_ddr50_clk = 98;
 775         chip->asic_sd_hs_clk = 98;
 776         chip->asic_mmc_52m_clk = 98;
 777         chip->asic_ms_hg_clk = 117;
 778         chip->asic_ms_4bit_clk = 78;
 779         chip->asic_ms_1bit_clk = 39;
 780         chip->ssc_depth_sd_sdr104 = SSC_DEPTH_2M;
 781         chip->ssc_depth_sd_sdr50 = SSC_DEPTH_2M;
 782         chip->ssc_depth_sd_ddr50 = SSC_DEPTH_1M;
 783         chip->ssc_depth_sd_hs = SSC_DEPTH_1M;
 784         chip->ssc_depth_mmc_52m = SSC_DEPTH_1M;
 785         chip->ssc_depth_ms_hg = SSC_DEPTH_1M;
 786         chip->ssc_depth_ms_4bit = SSC_DEPTH_512K;
 787         chip->ssc_depth_low_speed = SSC_DEPTH_512K;
 788         chip->ssc_en = 1;
 789         chip->sd_speed_prior = 0x01040203;
 790         chip->sd_current_prior = 0x00010203;
 791         chip->sd_ctl = SD_PUSH_POINT_AUTO |
 792                        SD_SAMPLE_POINT_AUTO |
 793                        SUPPORT_MMC_DDR_MODE;
 794         chip->sd_ddr_tx_phase = 0;
 795         chip->mmc_ddr_tx_phase = 1;
 796         chip->sd_default_tx_phase = 15;
 797         chip->sd_default_rx_phase = 15;
 798         chip->pmos_pwr_on_interval = 200;
 799         chip->sd_voltage_switch_delay = 1000;
 800         chip->ms_power_class_en = 3;
 801
 802         chip->sd_400mA_ocp_thd = 1;
 803         chip->sd_800mA_ocp_thd = 5;
 804         chip->ms_ocp_thd = 2;
 805
 806         chip->card_drive_sel = 0x55;
 807         chip->sd30_drive_sel_1v8 = 0x03;
 808         chip->sd30_drive_sel_3v3 = 0x01;
 809
 810         chip->do_delink_before_power_down = 1;
 811         chip->auto_power_down = 1;
 812         chip->polling_config = 0;
 813
 814         chip->force_clkreq_0 = 1;
 815         chip->ft2_fast_mode = 0;
 816
 817         chip->sdio_retry_cnt = 1;
 818
 819         chip->xd_timeout = 2000;
 820         chip->sd_timeout = 10000;
 821         chip->ms_timeout = 2000;
 822         chip->mspro_timeout = 15000;
 823
 824         chip->power_down_in_ss = 1;
 825
 826         chip->sdr104_en = 1;
 827         chip->sdr50_en = 1;
 828         chip->ddr50_en = 1;
 829
 830         chip->delink_stage1_step = 100;
 831         chip->delink_stage2_step = 40;
 832         chip->delink_stage3_step = 20;
 833
 834         chip->auto_delink_in_L1 = 1;
 835         chip->blink_led = 1;
 836         chip->msi_en = msi_en;
 837         chip->hp_watch_bios_hotplug = 0;
 838         chip->max_payload = 0;
 839         chip->phy_voltage = 0;
 840
 841         chip->support_ms_8bit = 1;
 842         chip->s3_pwr_off_delay = 1000;
 843 }
 844
 845 static int rtsx_probe(struct pci_dev *pci,
 846                                 const struct pci_device_id *pci_id)
 847 {
 848         struct Scsi_Host *host;
 849         struct rtsx_dev *dev;
 850         int err = 0;
 851         struct task_struct *th;
 852
 853         dev_dbg(&pci->dev, "Realtek PCI-E card reader detected\n");
 854
 855         err = pci_enable_device(pci);
 856         if (err < 0) {
 857                 dev_err(&pci->dev, "PCI enable device failed!\n");
 858                 return err;
 859         }
 860
 861         err = pci_request_regions(pci, CR_DRIVER_NAME);
 862         if (err < 0) {
 863                 dev_err(&pci->dev, "PCI request regions for %s failed!\n",
 864                         CR_DRIVER_NAME);
 865                 pci_disable_device(pci);
 866                 return err;
 867         }
 868
 869         /*
 870          * Ask the SCSI layer to allocate a host structure, with extra
 871          * space at the end for our private rtsx_dev structure.
 872          */
 873         host = scsi_host_alloc(&rtsx_host_template, sizeof(*dev));
 874         if (!host) {
 875                 dev_err(&pci->dev, "Unable to allocate the scsi host\n");
 876                 pci_release_regions(pci);
 877                 pci_disable_device(pci);
 878                 return -ENOMEM;
 879         }
 880
 881         dev = host_to_rtsx(host);
 882         memset(dev, 0, sizeof(struct rtsx_dev));
 883
 884         dev->chip = kzalloc(sizeof(struct rtsx_chip), GFP_KERNEL);
 885         if (dev->chip == NULL) {
 886                 err = -ENOMEM;
 887                 goto errout;
 888         }
 889
 890         spin_lock_init(&dev->reg_lock);
 891         mutex_init(&(dev->dev_mutex));
 892         init_completion(&dev->cmnd_ready);
 893         init_completion(&dev->control_exit);
 894         init_completion(&dev->polling_exit);
 895         init_completion(&(dev->notify));
 896         init_completion(&dev->scanning_done);
 897         init_waitqueue_head(&dev->delay_wait);
 898
 899         dev->pci = pci;
 900         dev->irq = -1;
 901
 902         dev_info(&pci->dev, "Resource length: 0x%x\n",
 903                  (unsigned int)pci_resource_len(pci, 0));
 904         dev->addr = pci_resource_start(pci, 0);
 905         dev->remap_addr = ioremap_nocache(dev->addr, pci_resource_len(pci, 0));
 906         if (dev->remap_addr == NULL) {
 907                 dev_err(&pci->dev, "ioremap error\n");
 908                 err = -ENXIO;
 909                 goto errout;
 910         }
 911
 912         /*
 913          * Using "unsigned long" cast here to eliminate gcc warning in
 914          * 64-bit system
 915          */
 916         dev_info(&pci->dev, "Original address: 0x%lx, remapped address: 0x%lx\n",
 917                  (unsigned long)(dev->addr), (unsigned long)(dev->remap_addr));
 918
 919         dev->rtsx_resv_buf = dmam_alloc_coherent(&pci->dev, RTSX_RESV_BUF_LEN,
 920                         &dev->rtsx_resv_buf_addr, GFP_KERNEL);
 921         if (dev->rtsx_resv_buf == NULL) {
 922                 dev_err(&pci->dev, "alloc dma buffer fail\n");
 923                 err = -ENXIO;
 924                 goto errout;
 925         }
 926         dev->chip->host_cmds_ptr = dev->rtsx_resv_buf;
 927         dev->chip->host_cmds_addr = dev->rtsx_resv_buf_addr;
 928         dev->chip->host_sg_tbl_ptr = dev->rtsx_resv_buf + HOST_CMDS_BUF_LEN;
 929         dev->chip->host_sg_tbl_addr = dev->rtsx_resv_buf_addr +
 930                                       HOST_CMDS_BUF_LEN;
 931
 932         dev->chip->rtsx = dev;
 933
 934         rtsx_init_options(dev->chip);
 935
 936         dev_info(&pci->dev, "pci->irq = %d\n", pci->irq);
 937
 938         if (dev->chip->msi_en) {
 939                 if (pci_enable_msi(pci) < 0)
 940                         dev->chip->msi_en = 0;
 941         }
 942
 943         if (rtsx_acquire_irq(dev) < 0) {
 944                 err = -EBUSY;
 945                 goto errout;
 946         }
 947
 948         pci_set_master(pci);
 949         synchronize_irq(dev->irq);
 950
 951         rtsx_init_chip(dev->chip);
 952
 953         /* set the supported max_lun and max_id for the scsi host
 954          * NOTE: the minimal value of max_id is 1 */
 955         host->max_id = 1;
 956         host->max_lun = dev->chip->max_lun;
 957
 958         /* Start up our control thread */
 959         th = kthread_run(rtsx_control_thread, dev, CR_DRIVER_NAME);
 960         if (IS_ERR(th)) {
 961                 dev_err(&pci->dev, "Unable to start control thread\n");
 962                 err = PTR_ERR(th);
 963                 goto errout;
 964         }
 965         dev->ctl_thread = th;
 966
 967         err = scsi_add_host(host, &pci->dev);
 968         if (err) {
 969                 dev_err(&pci->dev, "Unable to add the scsi host\n");
 970                 goto errout;
 971         }
 972
 973         /* Start up the thread for delayed SCSI-device scanning */
 974         th = kthread_run(rtsx_scan_thread, dev, "rtsx-scan");
 975         if (IS_ERR(th)) {
 976                 dev_err(&pci->dev, "Unable to start the device-scanning thread\n");
 977                 complete(&dev->scanning_done);
 978                 quiesce_and_remove_host(dev);
 979                 err = PTR_ERR(th);
 980                 goto errout;
 981         }
 982
 983         /* Start up the thread for polling thread */
 984         th = kthread_run(rtsx_polling_thread, dev, "rtsx-polling");
 985         if (IS_ERR(th)) {
 986                 dev_err(&pci->dev, "Unable to start the device-polling thread\n");
 987                 quiesce_and_remove_host(dev);
 988                 err = PTR_ERR(th);
 989                 goto errout;
 990         }
 991         dev->polling_thread = th;
 992
 993         pci_set_drvdata(pci, dev);
 994
 995         return 0;
 996
 997         /* We come here if there are any problems */
 998 errout:
 999         dev_err(&pci->dev, "rtsx_probe() failed\n");
1000         release_everything(dev);
1001
1002         return err;
1003 }
1004
1005
1006 static void rtsx_remove(struct pci_dev *pci)
1007 {
1008         struct rtsx_dev *dev = pci_get_drvdata(pci);
1009
1010         dev_info(&pci->dev, "rtsx_remove() called\n");
1011
1012         quiesce_and_remove_host(dev);
1013         release_everything(dev);
1014
1015         pci_set_drvdata(pci, NULL);
1016 }
1017
1018 /* PCI IDs */
1019 static const struct pci_device_id rtsx_ids[] = {
1020         { PCI_DEVICE(PCI_VENDOR_ID_REALTEK, 0x5208),
1021                 PCI_CLASS_OTHERS << 16, 0xFF0000 },
1022         { PCI_DEVICE(PCI_VENDOR_ID_REALTEK, 0x5288),
1023                 PCI_CLASS_OTHERS << 16, 0xFF0000 },
1024         { 0, },
1025 };
1026
1027 MODULE_DEVICE_TABLE(pci, rtsx_ids);
1028
1029 /* pci_driver definition */
1030 static struct pci_driver rtsx_driver = {
1031         .name = CR_DRIVER_NAME,
1032         .id_table = rtsx_ids,
1033         .probe = rtsx_probe,
1034         .remove = rtsx_remove,
1035 #ifdef CONFIG_PM
1036         .suspend = rtsx_suspend,
1037         .resume = rtsx_resume,
1038 #endif
1039         .shutdown = rtsx_shutdown,
1040 };
1041
1042 module_pci_driver(rtsx_driver);