git.oblomov.eu Git - linux-2.6/blob - drivers/usb/storage/shuttle_usbat.c

   1 /* Driver for SCM Microsystems (a.k.a. Shuttle) USB-ATAPI cable
   2  *
   3  * $Id: shuttle_usbat.c,v 1.17 2002/04/22 03:39:43 mdharm Exp $
   4  *
   5  * Current development and maintenance by:
   6  *   (c) 2000, 2001 Robert Baruch (autophile@starband.net)
   7  *   (c) 2004, 2005 Daniel Drake <dsd@gentoo.org>
   8  *
   9  * Developed with the assistance of:
  10  *   (c) 2002 Alan Stern <stern@rowland.org>
  11  *
  12  * Flash support based on earlier work by:
  13  *   (c) 2002 Thomas Kreiling <usbdev@sm04.de>
  14  *
  15  * Many originally ATAPI devices were slightly modified to meet the USB
  16  * market by using some kind of translation from ATAPI to USB on the host,
  17  * and the peripheral would translate from USB back to ATAPI.
  18  *
  19  * SCM Microsystems (www.scmmicro.com) makes a device, sold to OEM's only,
  20  * which does the USB-to-ATAPI conversion.  By obtaining the data sheet on
  21  * their device under nondisclosure agreement, I have been able to write
  22  * this driver for Linux.
  23  *
  24  * The chip used in the device can also be used for EPP and ISA translation
  25  * as well. This driver is only guaranteed to work with the ATAPI
  26  * translation.
  27  *
  28  * See the Kconfig help text for a list of devices known to be supported by
  29  * this driver.
  30  *
  31  * This program is free software; you can redistribute it and/or modify it
  32  * under the terms of the GNU General Public License as published by the
  33  * Free Software Foundation; either version 2, or (at your option) any
  34  * later version.
  35  *
  36  * This program is distributed in the hope that it will be useful, but
  37  * WITHOUT ANY WARRANTY; without even the implied warranty of
  38  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  39  * General Public License for more details.
  40  *
  41  * You should have received a copy of the GNU General Public License along
  42  * with this program; if not, write to the Free Software Foundation, Inc.,
  43  * 675 Mass Ave, Cambridge, MA 02139, USA.
  44  */
  45
  46 #include <linux/sched.h>
  47 #include <linux/errno.h>
  48 #include <linux/slab.h>
  49 #include <linux/cdrom.h>
  50
  51 #include <scsi/scsi.h>
  52 #include <scsi/scsi_cmnd.h>
  53
  54 #include "usb.h"
  55 #include "transport.h"
  56 #include "protocol.h"
  57 #include "debug.h"
  58 #include "shuttle_usbat.h"
  59
  60 #define short_pack(LSB,MSB) ( ((u16)(LSB)) | ( ((u16)(MSB))<<8 ) )
  61 #define LSB_of(s) ((s)&0xFF)
  62 #define MSB_of(s) ((s)>>8)
  63
  64 static int transferred = 0;
  65
  66 static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us);
  67 static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us);
  68
  69 /*
  70  * Convenience function to produce an ATA read/write sectors command
  71  * Use cmd=0x20 for read, cmd=0x30 for write
  72  */
  73 static void usbat_pack_ata_sector_cmd(unsigned char *buf,
  74                                         unsigned char thistime,
  75                                         u32 sector, unsigned char cmd)
  76 {
  77         buf[0] = 0;
  78         buf[1] = thistime;
  79         buf[2] = sector & 0xFF;
  80         buf[3] = (sector >>  8) & 0xFF;
  81         buf[4] = (sector >> 16) & 0xFF;
  82         buf[5] = 0xE0 | ((sector >> 24) & 0x0F);
  83         buf[6] = cmd;
  84 }
  85
  86 /*
  87  * Convenience function to get the device type (flash or hp8200)
  88  */
  89 static int usbat_get_device_type(struct us_data *us)
  90 {
  91         return ((struct usbat_info*)us->extra)->devicetype;
  92 }
  93
  94 /*
  95  * Read a register from the device
  96  */
  97 static int usbat_read(struct us_data *us,
  98                       unsigned char access,
  99                       unsigned char reg,
 100                       unsigned char *content)
 101 {
 102         return usb_stor_ctrl_transfer(us,
 103                 us->recv_ctrl_pipe,
 104                 access | USBAT_CMD_READ_REG,
 105                 0xC0,
 106                 (u16)reg,
 107                 0,
 108                 content,
 109                 1);
 110 }
 111
 112 /*
 113  * Write to a register on the device
 114  */
 115 static int usbat_write(struct us_data *us,
 116                        unsigned char access,
 117                        unsigned char reg,
 118                        unsigned char content)
 119 {
 120         return usb_stor_ctrl_transfer(us,
 121                 us->send_ctrl_pipe,
 122                 access | USBAT_CMD_WRITE_REG,
 123                 0x40,
 124                 short_pack(reg, content),
 125                 0,
 126                 NULL,
 127                 0);
 128 }
 129
 130 /*
 131  * Convenience function to perform a bulk read
 132  */
 133 static int usbat_bulk_read(struct us_data *us,
 134                            unsigned char *data,
 135                            unsigned int len,
 136                            int use_sg)
 137 {
 138         if (len == 0)
 139                 return USB_STOR_XFER_GOOD;
 140
 141         US_DEBUGP("usbat_bulk_read: len = %d\n", len);
 142         return usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe, data, len, use_sg, NULL);
 143 }
 144
 145 /*
 146  * Convenience function to perform a bulk write
 147  */
 148 static int usbat_bulk_write(struct us_data *us,
 149                             unsigned char *data,
 150                             unsigned int len,
 151                             int use_sg)
 152 {
 153         if (len == 0)
 154                 return USB_STOR_XFER_GOOD;
 155
 156         US_DEBUGP("usbat_bulk_write:  len = %d\n", len);
 157         return usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe, data, len, use_sg, NULL);
 158 }
 159
 160 /*
 161  * Some USBAT-specific commands can only be executed over a command transport
 162  * This transport allows one (len=8) or two (len=16) vendor-specific commands
 163  * to be executed.
 164  */
 165 static int usbat_execute_command(struct us_data *us,
 166                                                                  unsigned char *commands,
 167                                                                  unsigned int len)
 168 {
 169         return usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
 170                                                                   USBAT_CMD_EXEC_CMD, 0x40, 0, 0,
 171                                                                   commands, len);
 172 }
 173
 174 /*
 175  * Read the status register
 176  */
 177 static int usbat_get_status(struct us_data *us, unsigned char *status)
 178 {
 179         int rc;
 180         rc = usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status);
 181
 182         US_DEBUGP("usbat_get_status: 0x%02X\n", (unsigned short) (*status));
 183         return rc;
 184 }
 185
 186 /*
 187  * Check the device status
 188  */
 189 static int usbat_check_status(struct us_data *us)
 190 {
 191         unsigned char *reply = us->iobuf;
 192         int rc;
 193
 194         if (!us)
 195                 return USB_STOR_TRANSPORT_ERROR;
 196
 197         rc = usbat_get_status(us, reply);
 198         if (rc != USB_STOR_XFER_GOOD)
 199                 return USB_STOR_TRANSPORT_FAILED;
 200
 201         /* error/check condition (0x51 is ok) */
 202         if (*reply & 0x01 && *reply != 0x51)
 203                 return USB_STOR_TRANSPORT_FAILED;
 204
 205         /* device fault */
 206         if (*reply & 0x20)
 207                 return USB_STOR_TRANSPORT_FAILED;
 208
 209         return USB_STOR_TRANSPORT_GOOD;
 210 }
 211
 212 /*
 213  * Stores critical information in internal registers in prepartion for the execution
 214  * of a conditional usbat_read_blocks or usbat_write_blocks call.
 215  */
 216 static int usbat_set_shuttle_features(struct us_data *us,
 217                                       unsigned char external_trigger,
 218                                       unsigned char epp_control,
 219                                       unsigned char mask_byte,
 220                                       unsigned char test_pattern,
 221                                       unsigned char subcountH,
 222                                       unsigned char subcountL)
 223 {
 224         unsigned char *command = us->iobuf;
 225
 226         command[0] = 0x40;
 227         command[1] = USBAT_CMD_SET_FEAT;
 228
 229         /*
 230          * The only bit relevant to ATA access is bit 6
 231          * which defines 8 bit data access (set) or 16 bit (unset)
 232          */
 233         command[2] = epp_control;
 234
 235         /*
 236          * If FCQ is set in the qualifier (defined in R/W cmd), then bits U0, U1,
 237          * ET1 and ET2 define an external event to be checked for on event of a
 238          * _read_blocks or _write_blocks operation. The read/write will not take
 239          * place unless the defined trigger signal is active.
 240          */
 241         command[3] = external_trigger;
 242
 243         /*
 244          * The resultant byte of the mask operation (see mask_byte) is compared for
 245          * equivalence with this test pattern. If equal, the read/write will take
 246          * place.
 247          */
 248         command[4] = test_pattern;
 249
 250         /*
 251          * This value is logically ANDed with the status register field specified
 252          * in the read/write command.
 253          */
 254         command[5] = mask_byte;
 255
 256         /*
 257          * If ALQ is set in the qualifier, this field contains the address of the
 258          * registers where the byte count should be read for transferring the data.
 259          * If ALQ is not set, then this field contains the number of bytes to be
 260          * transferred.
 261          */
 262         command[6] = subcountL;
 263         command[7] = subcountH;
 264
 265         return usbat_execute_command(us, command, 8);
 266 }
 267
 268 /*
 269  * Block, waiting for an ATA device to become not busy or to report
 270  * an error condition.
 271  */
 272 static int usbat_wait_not_busy(struct us_data *us, int minutes)
 273 {
 274         int i;
 275         int result;
 276         unsigned char *status = us->iobuf;
 277
 278         /* Synchronizing cache on a CDR could take a heck of a long time,
 279          * but probably not more than 10 minutes or so. On the other hand,
 280          * doing a full blank on a CDRW at speed 1 will take about 75
 281          * minutes!
 282          */
 283
 284         for (i=0; i<1200+minutes*60; i++) {
 285
 286                 result = usbat_get_status(us, status);
 287
 288                 if (result!=USB_STOR_XFER_GOOD)
 289                         return USB_STOR_TRANSPORT_ERROR;
 290                 if (*status & 0x01) { /* check condition */
 291                         result = usbat_read(us, USBAT_ATA, 0x10, status);
 292                         return USB_STOR_TRANSPORT_FAILED;
 293                 }
 294                 if (*status & 0x20) /* device fault */
 295                         return USB_STOR_TRANSPORT_FAILED;
 296
 297                 if ((*status & 0x80)==0x00) { /* not busy */
 298                         US_DEBUGP("Waited not busy for %d steps\n", i);
 299                         return USB_STOR_TRANSPORT_GOOD;
 300                 }
 301
 302                 if (i<500)
 303                         msleep(10); /* 5 seconds */
 304                 else if (i<700)
 305                         msleep(50); /* 10 seconds */
 306                 else if (i<1200)
 307                         msleep(100); /* 50 seconds */
 308                 else
 309                         msleep(1000); /* X minutes */
 310         }
 311
 312         US_DEBUGP("Waited not busy for %d minutes, timing out.\n",
 313                 minutes);
 314         return USB_STOR_TRANSPORT_FAILED;
 315 }
 316
 317 /*
 318  * Read block data from the data register
 319  */
 320 static int usbat_read_block(struct us_data *us,
 321                             unsigned char *content,
 322                             unsigned short len,
 323                             int use_sg)
 324 {
 325         int result;
 326         unsigned char *command = us->iobuf;
 327
 328         if (!len)
 329                 return USB_STOR_TRANSPORT_GOOD;
 330
 331         command[0] = 0xC0;
 332         command[1] = USBAT_ATA | USBAT_CMD_READ_BLOCK;
 333         command[2] = USBAT_ATA_DATA;
 334         command[3] = 0;
 335         command[4] = 0;
 336         command[5] = 0;
 337         command[6] = LSB_of(len);
 338         command[7] = MSB_of(len);
 339
 340         result = usbat_execute_command(us, command, 8);
 341         if (result != USB_STOR_XFER_GOOD)
 342                 return USB_STOR_TRANSPORT_ERROR;
 343
 344         result = usbat_bulk_read(us, content, len, use_sg);
 345         return (result == USB_STOR_XFER_GOOD ?
 346                         USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
 347 }
 348
 349 /*
 350  * Write block data via the data register
 351  */
 352 static int usbat_write_block(struct us_data *us,
 353                              unsigned char access,
 354                              unsigned char *content,
 355                              unsigned short len,
 356                              int minutes,
 357                              int use_sg)
 358 {
 359         int result;
 360         unsigned char *command = us->iobuf;
 361
 362         if (!len)
 363                 return USB_STOR_TRANSPORT_GOOD;
 364
 365         command[0] = 0x40;
 366         command[1] = access | USBAT_CMD_WRITE_BLOCK;
 367         command[2] = USBAT_ATA_DATA;
 368         command[3] = 0;
 369         command[4] = 0;
 370         command[5] = 0;
 371         command[6] = LSB_of(len);
 372         command[7] = MSB_of(len);
 373
 374         result = usbat_execute_command(us, command, 8);
 375
 376         if (result != USB_STOR_XFER_GOOD)
 377                 return USB_STOR_TRANSPORT_ERROR;
 378
 379         result = usbat_bulk_write(us, content, len, use_sg);
 380         if (result != USB_STOR_XFER_GOOD)
 381                 return USB_STOR_TRANSPORT_ERROR;
 382
 383         return usbat_wait_not_busy(us, minutes);
 384 }
 385
 386 /*
 387  * Process read and write requests
 388  */
 389 static int usbat_hp8200e_rw_block_test(struct us_data *us,
 390                                        unsigned char access,
 391                                        unsigned char *registers,
 392                                        unsigned char *data_out,
 393                                        unsigned short num_registers,
 394                                        unsigned char data_reg,
 395                                        unsigned char status_reg,
 396                                        unsigned char timeout,
 397                                        unsigned char qualifier,
 398                                        int direction,
 399                                        unsigned char *content,
 400                                        unsigned short len,
 401                                        int use_sg,
 402                                        int minutes)
 403 {
 404         int result;
 405         unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
 406                         us->recv_bulk_pipe : us->send_bulk_pipe;
 407
 408         unsigned char *command = us->iobuf;
 409         int i, j;
 410         int cmdlen;
 411         unsigned char *data = us->iobuf;
 412         unsigned char *status = us->iobuf;
 413
 414         BUG_ON(num_registers > US_IOBUF_SIZE/2);
 415
 416         for (i=0; i<20; i++) {
 417
 418                 /*
 419                  * The first time we send the full command, which consists
 420                  * of downloading the SCSI command followed by downloading
 421                  * the data via a write-and-test.  Any other time we only
 422                  * send the command to download the data -- the SCSI command
 423                  * is still 'active' in some sense in the device.
 424                  *
 425                  * We're only going to try sending the data 10 times. After
 426                  * that, we just return a failure.
 427                  */
 428
 429                 if (i==0) {
 430                         cmdlen = 16;
 431                         /*
 432                          * Write to multiple registers
 433                          * Not really sure the 0x07, 0x17, 0xfc, 0xe7 is
 434                          * necessary here, but that's what came out of the
 435                          * trace every single time.
 436                          */
 437                         command[0] = 0x40;
 438                         command[1] = access | USBAT_CMD_WRITE_REGS;
 439                         command[2] = 0x07;
 440                         command[3] = 0x17;
 441                         command[4] = 0xFC;
 442                         command[5] = 0xE7;
 443                         command[6] = LSB_of(num_registers*2);
 444                         command[7] = MSB_of(num_registers*2);
 445                 } else
 446                         cmdlen = 8;
 447
 448                 /* Conditionally read or write blocks */
 449                 command[cmdlen-8] = (direction==DMA_TO_DEVICE ? 0x40 : 0xC0);
 450                 command[cmdlen-7] = access |
 451                                 (direction==DMA_TO_DEVICE ?
 452                                  USBAT_CMD_COND_WRITE_BLOCK : USBAT_CMD_COND_READ_BLOCK);
 453                 command[cmdlen-6] = data_reg;
 454                 command[cmdlen-5] = status_reg;
 455                 command[cmdlen-4] = timeout;
 456                 command[cmdlen-3] = qualifier;
 457                 command[cmdlen-2] = LSB_of(len);
 458                 command[cmdlen-1] = MSB_of(len);
 459
 460                 result = usbat_execute_command(us, command, cmdlen);
 461
 462                 if (result != USB_STOR_XFER_GOOD)
 463                         return USB_STOR_TRANSPORT_ERROR;
 464
 465                 if (i==0) {
 466
 467                         for (j=0; j<num_registers; j++) {
 468                                 data[j<<1] = registers[j];
 469                                 data[1+(j<<1)] = data_out[j];
 470                         }
 471
 472                         result = usbat_bulk_write(us, data, num_registers*2, 0);
 473                         if (result != USB_STOR_XFER_GOOD)
 474                                 return USB_STOR_TRANSPORT_ERROR;
 475
 476                 }
 477
 478                 result = usb_stor_bulk_transfer_sg(us,
 479                         pipe, content, len, use_sg, NULL);
 480
 481                 /*
 482                  * If we get a stall on the bulk download, we'll retry
 483                  * the bulk download -- but not the SCSI command because
 484                  * in some sense the SCSI command is still 'active' and
 485                  * waiting for the data. Don't ask me why this should be;
 486                  * I'm only following what the Windoze driver did.
 487                  *
 488                  * Note that a stall for the test-and-read/write command means
 489                  * that the test failed. In this case we're testing to make
 490                  * sure that the device is error-free
 491                  * (i.e. bit 0 -- CHK -- of status is 0). The most likely
 492                  * hypothesis is that the USBAT chip somehow knows what
 493                  * the device will accept, but doesn't give the device any
 494                  * data until all data is received. Thus, the device would
 495                  * still be waiting for the first byte of data if a stall
 496                  * occurs, even if the stall implies that some data was
 497                  * transferred.
 498                  */
 499
 500                 if (result == USB_STOR_XFER_SHORT ||
 501                                 result == USB_STOR_XFER_STALLED) {
 502
 503                         /*
 504                          * If we're reading and we stalled, then clear
 505                          * the bulk output pipe only the first time.
 506                          */
 507
 508                         if (direction==DMA_FROM_DEVICE && i==0) {
 509                                 if (usb_stor_clear_halt(us,
 510                                                 us->send_bulk_pipe) < 0)
 511                                         return USB_STOR_TRANSPORT_ERROR;
 512                         }
 513
 514                         /*
 515                          * Read status: is the device angry, or just busy?
 516                          */
 517
 518                         result = usbat_read(us, USBAT_ATA,
 519                                 direction==DMA_TO_DEVICE ?
 520                                         USBAT_ATA_STATUS : USBAT_ATA_ALTSTATUS,
 521                                 status);
 522
 523                         if (result!=USB_STOR_XFER_GOOD)
 524                                 return USB_STOR_TRANSPORT_ERROR;
 525                         if (*status & 0x01) /* check condition */
 526                                 return USB_STOR_TRANSPORT_FAILED;
 527                         if (*status & 0x20) /* device fault */
 528                                 return USB_STOR_TRANSPORT_FAILED;
 529
 530                         US_DEBUGP("Redoing %s\n",
 531                           direction==DMA_TO_DEVICE ? "write" : "read");
 532
 533                 } else if (result != USB_STOR_XFER_GOOD)
 534                         return USB_STOR_TRANSPORT_ERROR;
 535                 else
 536                         return usbat_wait_not_busy(us, minutes);
 537
 538         }
 539
 540         US_DEBUGP("Bummer! %s bulk data 20 times failed.\n",
 541                 direction==DMA_TO_DEVICE ? "Writing" : "Reading");
 542
 543         return USB_STOR_TRANSPORT_FAILED;
 544 }
 545
 546 /*
 547  * Write to multiple registers:
 548  * Allows us to write specific data to any registers. The data to be written
 549  * gets packed in this sequence: reg0, data0, reg1, data1, ..., regN, dataN
 550  * which gets sent through bulk out.
 551  * Not designed for large transfers of data!
 552  */
 553 static int usbat_multiple_write(struct us_data *us,
 554                                 unsigned char *registers,
 555                                 unsigned char *data_out,
 556                                 unsigned short num_registers)
 557 {
 558         int i, result;
 559         unsigned char *data = us->iobuf;
 560         unsigned char *command = us->iobuf;
 561
 562         BUG_ON(num_registers > US_IOBUF_SIZE/2);
 563
 564         /* Write to multiple registers, ATA access */
 565         command[0] = 0x40;
 566         command[1] = USBAT_ATA | USBAT_CMD_WRITE_REGS;
 567
 568         /* No relevance */
 569         command[2] = 0;
 570         command[3] = 0;
 571         command[4] = 0;
 572         command[5] = 0;
 573
 574         /* Number of bytes to be transferred (incl. addresses and data) */
 575         command[6] = LSB_of(num_registers*2);
 576         command[7] = MSB_of(num_registers*2);
 577
 578         /* The setup command */
 579         result = usbat_execute_command(us, command, 8);
 580         if (result != USB_STOR_XFER_GOOD)
 581                 return USB_STOR_TRANSPORT_ERROR;
 582
 583         /* Create the reg/data, reg/data sequence */
 584         for (i=0; i<num_registers; i++) {
 585                 data[i<<1] = registers[i];
 586                 data[1+(i<<1)] = data_out[i];
 587         }
 588
 589         /* Send the data */
 590         result = usbat_bulk_write(us, data, num_registers*2, 0);
 591         if (result != USB_STOR_XFER_GOOD)
 592                 return USB_STOR_TRANSPORT_ERROR;
 593
 594         if (usbat_get_device_type(us) == USBAT_DEV_HP8200)
 595                 return usbat_wait_not_busy(us, 0);
 596         else
 597                 return USB_STOR_TRANSPORT_GOOD;
 598 }
 599
 600 /*
 601  * Conditionally read blocks from device:
 602  * Allows us to read blocks from a specific data register, based upon the
 603  * condition that a status register can be successfully masked with a status
 604  * qualifier. If this condition is not initially met, the read will wait
 605  * up until a maximum amount of time has elapsed, as specified by timeout.
 606  * The read will start when the condition is met, otherwise the command aborts.
 607  *
 608  * The qualifier defined here is not the value that is masked, it defines
 609  * conditions for the write to take place. The actual masked qualifier (and
 610  * other related details) are defined beforehand with _set_shuttle_features().
 611  */
 612 static int usbat_read_blocks(struct us_data *us,
 613                              unsigned char *buffer,
 614                              int len,
 615                              int use_sg)
 616 {
 617         int result;
 618         unsigned char *command = us->iobuf;
 619
 620         command[0] = 0xC0;
 621         command[1] = USBAT_ATA | USBAT_CMD_COND_READ_BLOCK;
 622         command[2] = USBAT_ATA_DATA;
 623         command[3] = USBAT_ATA_STATUS;
 624         command[4] = 0xFD; /* Timeout (ms); */
 625         command[5] = USBAT_QUAL_FCQ;
 626         command[6] = LSB_of(len);
 627         command[7] = MSB_of(len);
 628
 629         /* Multiple block read setup command */
 630         result = usbat_execute_command(us, command, 8);
 631         if (result != USB_STOR_XFER_GOOD)
 632                 return USB_STOR_TRANSPORT_FAILED;
 633
 634         /* Read the blocks we just asked for */
 635         result = usbat_bulk_read(us, buffer, len, use_sg);
 636         if (result != USB_STOR_XFER_GOOD)
 637                 return USB_STOR_TRANSPORT_FAILED;
 638
 639         return USB_STOR_TRANSPORT_GOOD;
 640 }
 641
 642 /*
 643  * Conditionally write blocks to device:
 644  * Allows us to write blocks to a specific data register, based upon the
 645  * condition that a status register can be successfully masked with a status
 646  * qualifier. If this condition is not initially met, the write will wait
 647  * up until a maximum amount of time has elapsed, as specified by timeout.
 648  * The read will start when the condition is met, otherwise the command aborts.
 649  *
 650  * The qualifier defined here is not the value that is masked, it defines
 651  * conditions for the write to take place. The actual masked qualifier (and
 652  * other related details) are defined beforehand with _set_shuttle_features().
 653  */
 654 static int usbat_write_blocks(struct us_data *us,
 655                                                           unsigned char *buffer,
 656                               int len,
 657                               int use_sg)
 658 {
 659         int result;
 660         unsigned char *command = us->iobuf;
 661
 662         command[0] = 0x40;
 663         command[1] = USBAT_ATA | USBAT_CMD_COND_WRITE_BLOCK;
 664         command[2] = USBAT_ATA_DATA;
 665         command[3] = USBAT_ATA_STATUS;
 666         command[4] = 0xFD; /* Timeout (ms) */
 667         command[5] = USBAT_QUAL_FCQ;
 668         command[6] = LSB_of(len);
 669         command[7] = MSB_of(len);
 670
 671         /* Multiple block write setup command */
 672         result = usbat_execute_command(us, command, 8);
 673         if (result != USB_STOR_XFER_GOOD)
 674                 return USB_STOR_TRANSPORT_FAILED;
 675
 676         /* Write the data */
 677         result = usbat_bulk_write(us, buffer, len, use_sg);
 678         if (result != USB_STOR_XFER_GOOD)
 679                 return USB_STOR_TRANSPORT_FAILED;
 680
 681         return USB_STOR_TRANSPORT_GOOD;
 682 }
 683
 684 /*
 685  * Read the User IO register
 686  */
 687 static int usbat_read_user_io(struct us_data *us, unsigned char *data_flags)
 688 {
 689         int result;
 690
 691         result = usb_stor_ctrl_transfer(us,
 692                 us->recv_ctrl_pipe,
 693                 USBAT_CMD_UIO,
 694                 0xC0,
 695                 0,
 696                 0,
 697                 data_flags,
 698                 USBAT_UIO_READ);
 699
 700         US_DEBUGP("usbat_read_user_io: UIO register reads %02X\n", (unsigned short) (*data_flags));
 701
 702         return result;
 703 }
 704
 705 /*
 706  * Write to the User IO register
 707  */
 708 static int usbat_write_user_io(struct us_data *us,
 709                                unsigned char enable_flags,
 710                                unsigned char data_flags)
 711 {
 712         return usb_stor_ctrl_transfer(us,
 713                 us->send_ctrl_pipe,
 714                 USBAT_CMD_UIO,
 715                 0x40,
 716                 short_pack(enable_flags, data_flags),
 717                 0,
 718                 NULL,
 719                 USBAT_UIO_WRITE);
 720 }
 721
 722 /*
 723  * Reset the device
 724  * Often needed on media change.
 725  */
 726 static int usbat_device_reset(struct us_data *us)
 727 {
 728         int rc;
 729
 730         /*
 731          * Reset peripheral, enable peripheral control signals
 732          * (bring reset signal up)
 733          */
 734         rc = usbat_write_user_io(us,
 735                                                          USBAT_UIO_DRVRST | USBAT_UIO_OE1 | USBAT_UIO_OE0,
 736                                                          USBAT_UIO_EPAD | USBAT_UIO_1);
 737         if (rc != USB_STOR_XFER_GOOD)
 738                 return USB_STOR_TRANSPORT_ERROR;
 739
 740         /*
 741          * Enable peripheral control signals
 742          * (bring reset signal down)
 743          */
 744         rc = usbat_write_user_io(us,
 745                                                          USBAT_UIO_OE1  | USBAT_UIO_OE0,
 746                                                          USBAT_UIO_EPAD | USBAT_UIO_1);
 747         if (rc != USB_STOR_XFER_GOOD)
 748                 return USB_STOR_TRANSPORT_ERROR;
 749
 750         return USB_STOR_TRANSPORT_GOOD;
 751 }
 752
 753 /*
 754  * Enable card detect
 755  */
 756 static int usbat_device_enable_cdt(struct us_data *us)
 757 {
 758         int rc;
 759
 760         /* Enable peripheral control signals and card detect */
 761         rc = usbat_write_user_io(us,
 762                                                          USBAT_UIO_ACKD | USBAT_UIO_OE1  | USBAT_UIO_OE0,
 763                                                          USBAT_UIO_EPAD | USBAT_UIO_1);
 764         if (rc != USB_STOR_XFER_GOOD)
 765                 return USB_STOR_TRANSPORT_ERROR;
 766
 767         return USB_STOR_TRANSPORT_GOOD;
 768 }
 769
 770 /*
 771  * Determine if media is present.
 772  */
 773 static int usbat_flash_check_media_present(unsigned char *uio)
 774 {
 775         if (*uio & USBAT_UIO_UI0) {
 776                 US_DEBUGP("usbat_flash_check_media_present: no media detected\n");
 777                 return USBAT_FLASH_MEDIA_NONE;
 778         }
 779
 780         return USBAT_FLASH_MEDIA_CF;
 781 }
 782
 783 /*
 784  * Determine if media has changed since last operation
 785  */
 786 static int usbat_flash_check_media_changed(unsigned char *uio)
 787 {
 788         if (*uio & USBAT_UIO_0) {
 789                 US_DEBUGP("usbat_flash_check_media_changed: media change detected\n");
 790                 return USBAT_FLASH_MEDIA_CHANGED;
 791         }
 792
 793         return USBAT_FLASH_MEDIA_SAME;
 794 }
 795
 796 /*
 797  * Check for media change / no media and handle the situation appropriately
 798  */
 799 static int usbat_flash_check_media(struct us_data *us,
 800                                    struct usbat_info *info)
 801 {
 802         int rc;
 803         unsigned char *uio = us->iobuf;
 804
 805         rc = usbat_read_user_io(us, uio);
 806         if (rc != USB_STOR_XFER_GOOD)
 807                 return USB_STOR_TRANSPORT_ERROR;
 808
 809         /* Check for media existence */
 810         rc = usbat_flash_check_media_present(uio);
 811         if (rc == USBAT_FLASH_MEDIA_NONE) {
 812                 info->sense_key = 0x02;
 813                 info->sense_asc = 0x3A;
 814                 info->sense_ascq = 0x00;
 815                 return USB_STOR_TRANSPORT_FAILED;
 816         }
 817
 818         /* Check for media change */
 819         rc = usbat_flash_check_media_changed(uio);
 820         if (rc == USBAT_FLASH_MEDIA_CHANGED) {
 821
 822                 /* Reset and re-enable card detect */
 823                 rc = usbat_device_reset(us);
 824                 if (rc != USB_STOR_TRANSPORT_GOOD)
 825                         return rc;
 826                 rc = usbat_device_enable_cdt(us);
 827                 if (rc != USB_STOR_TRANSPORT_GOOD)
 828                         return rc;
 829
 830                 msleep(50);
 831
 832                 rc = usbat_read_user_io(us, uio);
 833                 if (rc != USB_STOR_XFER_GOOD)
 834                         return USB_STOR_TRANSPORT_ERROR;
 835
 836                 info->sense_key = UNIT_ATTENTION;
 837                 info->sense_asc = 0x28;
 838                 info->sense_ascq = 0x00;
 839                 return USB_STOR_TRANSPORT_FAILED;
 840         }
 841
 842         return USB_STOR_TRANSPORT_GOOD;
 843 }
 844
 845 /*
 846  * Determine whether we are controlling a flash-based reader/writer,
 847  * or a HP8200-based CD drive.
 848  * Sets transport functions as appropriate.
 849  */
 850 static int usbat_identify_device(struct us_data *us,
 851                                  struct usbat_info *info)
 852 {
 853         int rc;
 854         unsigned char status;
 855
 856         if (!us || !info)
 857                 return USB_STOR_TRANSPORT_ERROR;
 858
 859         rc = usbat_device_reset(us);
 860         if (rc != USB_STOR_TRANSPORT_GOOD)
 861                 return rc;
 862         msleep(500);
 863
 864         /*
 865          * In attempt to distinguish between HP CDRW's and Flash readers, we now
 866          * execute the IDENTIFY PACKET DEVICE command. On ATA devices (i.e. flash
 867          * readers), this command should fail with error. On ATAPI devices (i.e.
 868          * CDROM drives), it should succeed.
 869          */
 870         rc = usbat_write(us, USBAT_ATA, USBAT_ATA_CMD, 0xA1);
 871         if (rc != USB_STOR_XFER_GOOD)
 872                 return USB_STOR_TRANSPORT_ERROR;
 873
 874         rc = usbat_get_status(us, &status);
 875         if (rc != USB_STOR_XFER_GOOD)
 876                 return USB_STOR_TRANSPORT_ERROR;
 877
 878         /* Check for error bit, or if the command 'fell through' */
 879         if (status == 0xA1 || !(status & 0x01)) {
 880                 /* Device is HP 8200 */
 881                 US_DEBUGP("usbat_identify_device: Detected HP8200 CDRW\n");
 882                 info->devicetype = USBAT_DEV_HP8200;
 883         } else {
 884                 /* Device is a CompactFlash reader/writer */
 885                 US_DEBUGP("usbat_identify_device: Detected Flash reader/writer\n");
 886                 info->devicetype = USBAT_DEV_FLASH;
 887         }
 888
 889         return USB_STOR_TRANSPORT_GOOD;
 890 }
 891
 892 /*
 893  * Set the transport function based on the device type
 894  */
 895 static int usbat_set_transport(struct us_data *us,
 896                                struct usbat_info *info,
 897                                int devicetype)
 898 {
 899
 900         if (!info->devicetype)
 901                 info->devicetype = devicetype;
 902
 903         if (!info->devicetype)
 904                 usbat_identify_device(us, info);
 905
 906         switch (info->devicetype) {
 907         default:
 908                 return USB_STOR_TRANSPORT_ERROR;
 909
 910         case  USBAT_DEV_HP8200:
 911                 us->transport = usbat_hp8200e_transport;
 912                 break;
 913
 914         case USBAT_DEV_FLASH:
 915                 us->transport = usbat_flash_transport;
 916                 break;
 917         }
 918
 919         return 0;
 920 }
 921
 922 /*
 923  * Read the media capacity
 924  */
 925 static int usbat_flash_get_sector_count(struct us_data *us,
 926                                         struct usbat_info *info)
 927 {
 928         unsigned char registers[3] = {
 929                 USBAT_ATA_SECCNT,
 930                 USBAT_ATA_DEVICE,
 931                 USBAT_ATA_CMD,
 932         };
 933         unsigned char  command[3] = { 0x01, 0xA0, 0xEC };
 934         unsigned char *reply;
 935         unsigned char status;
 936         int rc;
 937
 938         if (!us || !info)
 939                 return USB_STOR_TRANSPORT_ERROR;
 940
 941         reply = kmalloc(512, GFP_NOIO);
 942         if (!reply)
 943                 return USB_STOR_TRANSPORT_ERROR;
 944
 945         /* ATA command : IDENTIFY DEVICE */
 946         rc = usbat_multiple_write(us, registers, command, 3);
 947         if (rc != USB_STOR_XFER_GOOD) {
 948                 US_DEBUGP("usbat_flash_get_sector_count: Gah! identify_device failed\n");
 949                 rc = USB_STOR_TRANSPORT_ERROR;
 950                 goto leave;
 951         }
 952
 953         /* Read device status */
 954         if (usbat_get_status(us, &status) != USB_STOR_XFER_GOOD) {
 955                 rc = USB_STOR_TRANSPORT_ERROR;
 956                 goto leave;
 957         }
 958
 959         msleep(100);
 960
 961         /* Read the device identification data */
 962         rc = usbat_read_block(us, reply, 512, 0);
 963         if (rc != USB_STOR_TRANSPORT_GOOD)
 964                 goto leave;
 965
 966         info->sectors = ((u32)(reply[117]) << 24) |
 967                 ((u32)(reply[116]) << 16) |
 968                 ((u32)(reply[115]) <<  8) |
 969                 ((u32)(reply[114])      );
 970
 971         rc = USB_STOR_TRANSPORT_GOOD;
 972
 973  leave:
 974         kfree(reply);
 975         return rc;
 976 }
 977
 978 /*
 979  * Read data from device
 980  */
 981 static int usbat_flash_read_data(struct us_data *us,
 982                                                                  struct usbat_info *info,
 983                                                                  u32 sector,
 984                                                                  u32 sectors)
 985 {
 986         unsigned char registers[7] = {
 987                 USBAT_ATA_FEATURES,
 988                 USBAT_ATA_SECCNT,
 989                 USBAT_ATA_SECNUM,
 990                 USBAT_ATA_LBA_ME,
 991                 USBAT_ATA_LBA_HI,
 992                 USBAT_ATA_DEVICE,
 993                 USBAT_ATA_STATUS,
 994         };
 995         unsigned char command[7];
 996         unsigned char *buffer;
 997         unsigned char  thistime;
 998         unsigned int totallen, alloclen;
 999         int len, result;
1000         unsigned int sg_idx = 0, sg_offset = 0;
1001
1002         result = usbat_flash_check_media(us, info);
1003         if (result != USB_STOR_TRANSPORT_GOOD)
1004                 return result;
1005
1006         /*
1007          * we're working in LBA mode.  according to the ATA spec,
1008          * we can support up to 28-bit addressing.  I don't know if Jumpshot
1009          * supports beyond 24-bit addressing.  It's kind of hard to test
1010          * since it requires > 8GB CF card.
1011          */
1012
1013         if (sector > 0x0FFFFFFF)
1014                 return USB_STOR_TRANSPORT_ERROR;
1015
1016         totallen = sectors * info->ssize;
1017
1018         /*
1019          * Since we don't read more than 64 KB at a time, we have to create
1020          * a bounce buffer and move the data a piece at a time between the
1021          * bounce buffer and the actual transfer buffer.
1022          */
1023
1024         alloclen = min(totallen, 65536u);
1025         buffer = kmalloc(alloclen, GFP_NOIO);
1026         if (buffer == NULL)
1027                 return USB_STOR_TRANSPORT_ERROR;
1028
1029         do {
1030                 /*
1031                  * loop, never allocate or transfer more than 64k at once
1032                  * (min(128k, 255*info->ssize) is the real limit)
1033                  */
1034                 len = min(totallen, alloclen);
1035                 thistime = (len / info->ssize) & 0xff;
1036
1037                 /* ATA command 0x20 (READ SECTORS) */
1038                 usbat_pack_ata_sector_cmd(command, thistime, sector, 0x20);
1039
1040                 /* Write/execute ATA read command */
1041                 result = usbat_multiple_write(us, registers, command, 7);
1042                 if (result != USB_STOR_TRANSPORT_GOOD)
1043                         goto leave;
1044
1045                 /* Read the data we just requested */
1046                 result = usbat_read_blocks(us, buffer, len, 0);
1047                 if (result != USB_STOR_TRANSPORT_GOOD)
1048                         goto leave;
1049
1050                 US_DEBUGP("usbat_flash_read_data:  %d bytes\n", len);
1051
1052                 /* Store the data in the transfer buffer */
1053                 usb_stor_access_xfer_buf(buffer, len, us->srb,
1054                                          &sg_idx, &sg_offset, TO_XFER_BUF);
1055
1056                 sector += thistime;
1057                 totallen -= len;
1058         } while (totallen > 0);
1059
1060         kfree(buffer);
1061         return USB_STOR_TRANSPORT_GOOD;
1062
1063 leave:
1064         kfree(buffer);
1065         return USB_STOR_TRANSPORT_ERROR;
1066 }
1067
1068 /*
1069  * Write data to device
1070  */
1071 static int usbat_flash_write_data(struct us_data *us,
1072                                                                   struct usbat_info *info,
1073                                                                   u32 sector,
1074                                                                   u32 sectors)
1075 {
1076         unsigned char registers[7] = {
1077                 USBAT_ATA_FEATURES,
1078                 USBAT_ATA_SECCNT,
1079                 USBAT_ATA_SECNUM,
1080                 USBAT_ATA_LBA_ME,
1081                 USBAT_ATA_LBA_HI,
1082                 USBAT_ATA_DEVICE,
1083                 USBAT_ATA_STATUS,
1084         };
1085         unsigned char command[7];
1086         unsigned char *buffer;
1087         unsigned char  thistime;
1088         unsigned int totallen, alloclen;
1089         int len, result;
1090         unsigned int sg_idx = 0, sg_offset = 0;
1091
1092         result = usbat_flash_check_media(us, info);
1093         if (result != USB_STOR_TRANSPORT_GOOD)
1094                 return result;
1095
1096         /*
1097          * we're working in LBA mode.  according to the ATA spec,
1098          * we can support up to 28-bit addressing.  I don't know if the device
1099          * supports beyond 24-bit addressing.  It's kind of hard to test
1100          * since it requires > 8GB media.
1101          */
1102
1103         if (sector > 0x0FFFFFFF)
1104                 return USB_STOR_TRANSPORT_ERROR;
1105
1106         totallen = sectors * info->ssize;
1107
1108         /*
1109          * Since we don't write more than 64 KB at a time, we have to create
1110          * a bounce buffer and move the data a piece at a time between the
1111          * bounce buffer and the actual transfer buffer.
1112          */
1113
1114         alloclen = min(totallen, 65536u);
1115         buffer = kmalloc(alloclen, GFP_NOIO);
1116         if (buffer == NULL)
1117                 return USB_STOR_TRANSPORT_ERROR;
1118
1119         do {
1120                 /*
1121                  * loop, never allocate or transfer more than 64k at once
1122                  * (min(128k, 255*info->ssize) is the real limit)
1123                  */
1124                 len = min(totallen, alloclen);
1125                 thistime = (len / info->ssize) & 0xff;
1126
1127                 /* Get the data from the transfer buffer */
1128                 usb_stor_access_xfer_buf(buffer, len, us->srb,
1129                                          &sg_idx, &sg_offset, FROM_XFER_BUF);
1130
1131                 /* ATA command 0x30 (WRITE SECTORS) */
1132                 usbat_pack_ata_sector_cmd(command, thistime, sector, 0x30);
1133
1134                 /* Write/execute ATA write command */
1135                 result = usbat_multiple_write(us, registers, command, 7);
1136                 if (result != USB_STOR_TRANSPORT_GOOD)
1137                         goto leave;
1138
1139                 /* Write the data */
1140                 result = usbat_write_blocks(us, buffer, len, 0);
1141                 if (result != USB_STOR_TRANSPORT_GOOD)
1142                         goto leave;
1143
1144                 sector += thistime;
1145                 totallen -= len;
1146         } while (totallen > 0);
1147
1148         kfree(buffer);
1149         return result;
1150
1151 leave:
1152         kfree(buffer);
1153         return USB_STOR_TRANSPORT_ERROR;
1154 }
1155
1156 /*
1157  * Squeeze a potentially huge (> 65535 byte) read10 command into
1158  * a little ( <= 65535 byte) ATAPI pipe
1159  */
1160 static int usbat_hp8200e_handle_read10(struct us_data *us,
1161                                        unsigned char *registers,
1162                                        unsigned char *data,
1163                                        struct scsi_cmnd *srb)
1164 {
1165         int result = USB_STOR_TRANSPORT_GOOD;
1166         unsigned char *buffer;
1167         unsigned int len;
1168         unsigned int sector;
1169         unsigned int sg_segment = 0;
1170         unsigned int sg_offset = 0;
1171
1172         US_DEBUGP("handle_read10: transfersize %d\n",
1173                 srb->transfersize);
1174
1175         if (srb->request_bufflen < 0x10000) {
1176
1177                 result = usbat_hp8200e_rw_block_test(us, USBAT_ATA,
1178                         registers, data, 19,
1179                         USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
1180                         (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
1181                         DMA_FROM_DEVICE,
1182                         srb->request_buffer,
1183                         srb->request_bufflen, srb->use_sg, 1);
1184
1185                 return result;
1186         }
1187
1188         /*
1189          * Since we're requesting more data than we can handle in
1190          * a single read command (max is 64k-1), we will perform
1191          * multiple reads, but each read must be in multiples of
1192          * a sector.  Luckily the sector size is in srb->transfersize
1193          * (see linux/drivers/scsi/sr.c).
1194          */
1195
1196         if (data[7+0] == GPCMD_READ_CD) {
1197                 len = short_pack(data[7+9], data[7+8]);
1198                 len <<= 16;
1199                 len |= data[7+7];
1200                 US_DEBUGP("handle_read10: GPCMD_READ_CD: len %d\n", len);
1201                 srb->transfersize = srb->request_bufflen/len;
1202         }
1203
1204         if (!srb->transfersize)  {
1205                 srb->transfersize = 2048; /* A guess */
1206                 US_DEBUGP("handle_read10: transfersize 0, forcing %d\n",
1207                         srb->transfersize);
1208         }
1209
1210         /*
1211          * Since we only read in one block at a time, we have to create
1212          * a bounce buffer and move the data a piece at a time between the
1213          * bounce buffer and the actual transfer buffer.
1214          */
1215
1216         len = (65535/srb->transfersize) * srb->transfersize;
1217         US_DEBUGP("Max read is %d bytes\n", len);
1218         len = min(len, srb->request_bufflen);
1219         buffer = kmalloc(len, GFP_NOIO);
1220         if (buffer == NULL) /* bloody hell! */
1221                 return USB_STOR_TRANSPORT_FAILED;
1222         sector = short_pack(data[7+3], data[7+2]);
1223         sector <<= 16;
1224         sector |= short_pack(data[7+5], data[7+4]);
1225         transferred = 0;
1226
1227         sg_segment = 0; /* for keeping track of where we are in */
1228         sg_offset = 0;  /* the scatter/gather list */
1229
1230         while (transferred != srb->request_bufflen) {
1231
1232                 if (len > srb->request_bufflen - transferred)
1233                         len = srb->request_bufflen - transferred;
1234
1235                 data[3] = len&0xFF;       /* (cylL) = expected length (L) */
1236                 data[4] = (len>>8)&0xFF;  /* (cylH) = expected length (H) */
1237
1238                 /* Fix up the SCSI command sector and num sectors */
1239
1240                 data[7+2] = MSB_of(sector>>16); /* SCSI command sector */
1241                 data[7+3] = LSB_of(sector>>16);
1242                 data[7+4] = MSB_of(sector&0xFFFF);
1243                 data[7+5] = LSB_of(sector&0xFFFF);
1244                 if (data[7+0] == GPCMD_READ_CD)
1245                         data[7+6] = 0;
1246                 data[7+7] = MSB_of(len / srb->transfersize); /* SCSI command */
1247                 data[7+8] = LSB_of(len / srb->transfersize); /* num sectors */
1248
1249                 result = usbat_hp8200e_rw_block_test(us, USBAT_ATA,
1250                         registers, data, 19,
1251                         USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
1252                         (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
1253                         DMA_FROM_DEVICE,
1254                         buffer,
1255                         len, 0, 1);
1256
1257                 if (result != USB_STOR_TRANSPORT_GOOD)
1258                         break;
1259
1260                 /* Store the data in the transfer buffer */
1261                 usb_stor_access_xfer_buf(buffer, len, srb,
1262                                  &sg_segment, &sg_offset, TO_XFER_BUF);
1263
1264                 /* Update the amount transferred and the sector number */
1265
1266                 transferred += len;
1267                 sector += len / srb->transfersize;
1268
1269         } /* while transferred != srb->request_bufflen */
1270
1271         kfree(buffer);
1272         return result;
1273 }
1274
1275 static int usbat_select_and_test_registers(struct us_data *us)
1276 {
1277         int selector;
1278         unsigned char *status = us->iobuf;
1279
1280         /* try device = master, then device = slave. */
1281         for (selector = 0xA0; selector <= 0xB0; selector += 0x10) {
1282                 if (usbat_write(us, USBAT_ATA, USBAT_ATA_DEVICE, selector) !=
1283                                 USB_STOR_XFER_GOOD)
1284                         return USB_STOR_TRANSPORT_ERROR;
1285
1286                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_STATUS, status) !=
1287                                 USB_STOR_XFER_GOOD)
1288                         return USB_STOR_TRANSPORT_ERROR;
1289
1290                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_DEVICE, status) !=
1291                                 USB_STOR_XFER_GOOD)
1292                         return USB_STOR_TRANSPORT_ERROR;
1293
1294                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) !=
1295                                 USB_STOR_XFER_GOOD)
1296                         return USB_STOR_TRANSPORT_ERROR;
1297
1298                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) !=
1299                                 USB_STOR_XFER_GOOD)
1300                         return USB_STOR_TRANSPORT_ERROR;
1301
1302                 if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_ME, 0x55) !=
1303                                 USB_STOR_XFER_GOOD)
1304                         return USB_STOR_TRANSPORT_ERROR;
1305
1306                 if (usbat_write(us, USBAT_ATA, USBAT_ATA_LBA_HI, 0xAA) !=
1307                                 USB_STOR_XFER_GOOD)
1308                         return USB_STOR_TRANSPORT_ERROR;
1309
1310                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) !=
1311                                 USB_STOR_XFER_GOOD)
1312                         return USB_STOR_TRANSPORT_ERROR;
1313
1314                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) !=
1315                                 USB_STOR_XFER_GOOD)
1316                         return USB_STOR_TRANSPORT_ERROR;
1317         }
1318
1319         return USB_STOR_TRANSPORT_GOOD;
1320 }
1321
1322 /*
1323  * Initialize the USBAT processor and the storage device
1324  */
1325 static int init_usbat(struct us_data *us, int devicetype)
1326 {
1327         int rc;
1328         struct usbat_info *info;
1329         unsigned char subcountH = USBAT_ATA_LBA_HI;
1330         unsigned char subcountL = USBAT_ATA_LBA_ME;
1331         unsigned char *status = us->iobuf;
1332
1333         us->extra = kzalloc(sizeof(struct usbat_info), GFP_NOIO);
1334         if (!us->extra) {
1335                 US_DEBUGP("init_usbat: Gah! Can't allocate storage for usbat info struct!\n");
1336                 return 1;
1337         }
1338         info = (struct usbat_info *) (us->extra);
1339
1340         /* Enable peripheral control signals */
1341         rc = usbat_write_user_io(us,
1342                                  USBAT_UIO_OE1 | USBAT_UIO_OE0,
1343                                  USBAT_UIO_EPAD | USBAT_UIO_1);
1344         if (rc != USB_STOR_XFER_GOOD)
1345                 return USB_STOR_TRANSPORT_ERROR;
1346
1347         US_DEBUGP("INIT 1\n");
1348
1349         msleep(2000);
1350
1351         rc = usbat_read_user_io(us, status);
1352         if (rc != USB_STOR_TRANSPORT_GOOD)
1353                 return rc;
1354
1355         US_DEBUGP("INIT 2\n");
1356
1357         rc = usbat_read_user_io(us, status);
1358         if (rc != USB_STOR_XFER_GOOD)
1359                 return USB_STOR_TRANSPORT_ERROR;
1360
1361         rc = usbat_read_user_io(us, status);
1362         if (rc != USB_STOR_XFER_GOOD)
1363                 return USB_STOR_TRANSPORT_ERROR;
1364
1365         US_DEBUGP("INIT 3\n");
1366
1367         rc = usbat_select_and_test_registers(us);
1368         if (rc != USB_STOR_TRANSPORT_GOOD)
1369                 return rc;
1370
1371         US_DEBUGP("INIT 4\n");
1372
1373         rc = usbat_read_user_io(us, status);
1374         if (rc != USB_STOR_XFER_GOOD)
1375                 return USB_STOR_TRANSPORT_ERROR;
1376
1377         US_DEBUGP("INIT 5\n");
1378
1379         /* Enable peripheral control signals and card detect */
1380         rc = usbat_device_enable_cdt(us);
1381         if (rc != USB_STOR_TRANSPORT_GOOD)
1382                 return rc;
1383
1384         US_DEBUGP("INIT 6\n");
1385
1386         rc = usbat_read_user_io(us, status);
1387         if (rc != USB_STOR_XFER_GOOD)
1388                 return USB_STOR_TRANSPORT_ERROR;
1389
1390         US_DEBUGP("INIT 7\n");
1391
1392         msleep(1400);
1393
1394         rc = usbat_read_user_io(us, status);
1395         if (rc != USB_STOR_XFER_GOOD)
1396                 return USB_STOR_TRANSPORT_ERROR;
1397
1398         US_DEBUGP("INIT 8\n");
1399
1400         rc = usbat_select_and_test_registers(us);
1401         if (rc != USB_STOR_TRANSPORT_GOOD)
1402                 return rc;
1403
1404         US_DEBUGP("INIT 9\n");
1405
1406         /* At this point, we need to detect which device we are using */
1407         if (usbat_set_transport(us, info, devicetype))
1408                 return USB_STOR_TRANSPORT_ERROR;
1409
1410         US_DEBUGP("INIT 10\n");
1411
1412         if (usbat_get_device_type(us) == USBAT_DEV_FLASH) {
1413                 subcountH = 0x02;
1414                 subcountL = 0x00;
1415         }
1416         rc = usbat_set_shuttle_features(us, (USBAT_FEAT_ETEN | USBAT_FEAT_ET2 | USBAT_FEAT_ET1),
1417                                                                         0x00, 0x88, 0x08, subcountH, subcountL);
1418         if (rc != USB_STOR_XFER_GOOD)
1419                 return USB_STOR_TRANSPORT_ERROR;
1420
1421         US_DEBUGP("INIT 11\n");
1422
1423         return USB_STOR_TRANSPORT_GOOD;
1424 }
1425
1426 /*
1427  * Transport for the HP 8200e
1428  */
1429 static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
1430 {
1431         int result;
1432         unsigned char *status = us->iobuf;
1433         unsigned char registers[32];
1434         unsigned char data[32];
1435         unsigned int len;
1436         int i;
1437         char string[64];
1438
1439         len = srb->request_bufflen;
1440
1441         /* Send A0 (ATA PACKET COMMAND).
1442            Note: I guess we're never going to get any of the ATA
1443            commands... just ATA Packet Commands.
1444          */
1445
1446         registers[0] = USBAT_ATA_FEATURES;
1447         registers[1] = USBAT_ATA_SECCNT;
1448         registers[2] = USBAT_ATA_SECNUM;
1449         registers[3] = USBAT_ATA_LBA_ME;
1450         registers[4] = USBAT_ATA_LBA_HI;
1451         registers[5] = USBAT_ATA_DEVICE;
1452         registers[6] = USBAT_ATA_CMD;
1453         data[0] = 0x00;
1454         data[1] = 0x00;
1455         data[2] = 0x00;
1456         data[3] = len&0xFF;             /* (cylL) = expected length (L) */
1457         data[4] = (len>>8)&0xFF;        /* (cylH) = expected length (H) */
1458         data[5] = 0xB0;                 /* (device sel) = slave */
1459         data[6] = 0xA0;                 /* (command) = ATA PACKET COMMAND */
1460
1461         for (i=7; i<19; i++) {
1462                 registers[i] = 0x10;
1463                 data[i] = (i-7 >= srb->cmd_len) ? 0 : srb->cmnd[i-7];
1464         }
1465
1466         result = usbat_get_status(us, status);
1467         US_DEBUGP("Status = %02X\n", *status);
1468         if (result != USB_STOR_XFER_GOOD)
1469                 return USB_STOR_TRANSPORT_ERROR;
1470         if (srb->cmnd[0] == TEST_UNIT_READY)
1471                 transferred = 0;
1472
1473         if (srb->sc_data_direction == DMA_TO_DEVICE) {
1474
1475                 result = usbat_hp8200e_rw_block_test(us, USBAT_ATA,
1476                         registers, data, 19,
1477                         USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
1478                         (USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
1479                         DMA_TO_DEVICE,
1480                         srb->request_buffer,
1481                         len, srb->use_sg, 10);
1482
1483                 if (result == USB_STOR_TRANSPORT_GOOD) {
1484                         transferred += len;
1485                         US_DEBUGP("Wrote %08X bytes\n", transferred);
1486                 }
1487
1488                 return result;
1489
1490         } else if (srb->cmnd[0] == READ_10 ||
1491                    srb->cmnd[0] == GPCMD_READ_CD) {
1492
1493                 return usbat_hp8200e_handle_read10(us, registers, data, srb);
1494
1495         }
1496
1497         if (len > 0xFFFF) {
1498                 US_DEBUGP("Error: len = %08X... what do I do now?\n",
1499                         len);
1500                 return USB_STOR_TRANSPORT_ERROR;
1501         }
1502
1503         if ( (result = usbat_multiple_write(us,
1504                         registers, data, 7)) != USB_STOR_TRANSPORT_GOOD) {
1505                 return result;
1506         }
1507
1508         /*
1509          * Write the 12-byte command header.
1510          *
1511          * If the command is BLANK then set the timer for 75 minutes.
1512          * Otherwise set it for 10 minutes.
1513          *
1514          * NOTE: THE 8200 DOCUMENTATION STATES THAT BLANKING A CDRW
1515          * AT SPEED 4 IS UNRELIABLE!!!
1516          */
1517
1518         if ((result = usbat_write_block(us,
1519                         USBAT_ATA, srb->cmnd, 12,
1520                                 (srb->cmnd[0]==GPCMD_BLANK ? 75 : 10), 0) !=
1521                              USB_STOR_TRANSPORT_GOOD)) {
1522                 return result;
1523         }
1524
1525         /* If there is response data to be read in then do it here. */
1526
1527         if (len != 0 && (srb->sc_data_direction == DMA_FROM_DEVICE)) {
1528
1529                 /* How many bytes to read in? Check cylL register */
1530
1531                 if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_ME, status) !=
1532                         USB_STOR_XFER_GOOD) {
1533                         return USB_STOR_TRANSPORT_ERROR;
1534                 }
1535
1536                 if (len > 0xFF) { /* need to read cylH also */
1537                         len = *status;
1538                         if (usbat_read(us, USBAT_ATA, USBAT_ATA_LBA_HI, status) !=
1539                                     USB_STOR_XFER_GOOD) {
1540                                 return USB_STOR_TRANSPORT_ERROR;
1541                         }
1542                         len += ((unsigned int) *status)<<8;
1543                 }
1544                 else
1545                         len = *status;
1546
1547
1548                 result = usbat_read_block(us, srb->request_buffer, len, srb->use_sg);
1549
1550                 /* Debug-print the first 32 bytes of the transfer */
1551
1552                 if (!srb->use_sg) {
1553                         string[0] = 0;
1554                         for (i=0; i<len && i<32; i++) {
1555                                 sprintf(string+strlen(string), "%02X ",
1556                                   ((unsigned char *)srb->request_buffer)[i]);
1557                                 if ((i%16)==15) {
1558                                         US_DEBUGP("%s\n", string);
1559                                         string[0] = 0;
1560                                 }
1561                         }
1562                         if (string[0]!=0)
1563                                 US_DEBUGP("%s\n", string);
1564                 }
1565         }
1566
1567         return result;
1568 }
1569
1570 /*
1571  * Transport for USBAT02-based CompactFlash and similar storage devices
1572  */
1573 static int usbat_flash_transport(struct scsi_cmnd * srb, struct us_data *us)
1574 {
1575         int rc;
1576         struct usbat_info *info = (struct usbat_info *) (us->extra);
1577         unsigned long block, blocks;
1578         unsigned char *ptr = us->iobuf;
1579         static unsigned char inquiry_response[36] = {
1580                 0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
1581         };
1582
1583         if (srb->cmnd[0] == INQUIRY) {
1584                 US_DEBUGP("usbat_flash_transport: INQUIRY. Returning bogus response.\n");
1585                 memcpy(ptr, inquiry_response, sizeof(inquiry_response));
1586                 fill_inquiry_response(us, ptr, 36);
1587                 return USB_STOR_TRANSPORT_GOOD;
1588         }
1589
1590         if (srb->cmnd[0] == READ_CAPACITY) {
1591                 rc = usbat_flash_check_media(us, info);
1592                 if (rc != USB_STOR_TRANSPORT_GOOD)
1593                         return rc;
1594
1595                 rc = usbat_flash_get_sector_count(us, info);
1596                 if (rc != USB_STOR_TRANSPORT_GOOD)
1597                         return rc;
1598
1599                 /* hard coded 512 byte sectors as per ATA spec */
1600                 info->ssize = 0x200;
1601                 US_DEBUGP("usbat_flash_transport: READ_CAPACITY: %ld sectors, %ld bytes per sector\n",
1602                           info->sectors, info->ssize);
1603
1604                 /*
1605                  * build the reply
1606                  * note: must return the sector number of the last sector,
1607                  * *not* the total number of sectors
1608                  */
1609                 ((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
1610                 ((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
1611                 usb_stor_set_xfer_buf(ptr, 8, srb);
1612
1613                 return USB_STOR_TRANSPORT_GOOD;
1614         }
1615
1616         if (srb->cmnd[0] == MODE_SELECT_10) {
1617                 US_DEBUGP("usbat_flash_transport:  Gah! MODE_SELECT_10.\n");
1618                 return USB_STOR_TRANSPORT_ERROR;
1619         }
1620
1621         if (srb->cmnd[0] == READ_10) {
1622                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
1623                                 ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
1624
1625                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
1626
1627                 US_DEBUGP("usbat_flash_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
1628                 return usbat_flash_read_data(us, info, block, blocks);
1629         }
1630
1631         if (srb->cmnd[0] == READ_12) {
1632                 /*
1633                  * I don't think we'll ever see a READ_12 but support it anyway
1634                  */
1635                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
1636                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
1637
1638                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
1639                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
1640
1641                 US_DEBUGP("usbat_flash_transport: READ_12: read block 0x%04lx  count %ld\n", block, blocks);
1642                 return usbat_flash_read_data(us, info, block, blocks);
1643         }
1644
1645         if (srb->cmnd[0] == WRITE_10) {
1646                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
1647                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
1648
1649                 blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));
1650
1651                 US_DEBUGP("usbat_flash_transport: WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
1652                 return usbat_flash_write_data(us, info, block, blocks);
1653         }
1654
1655         if (srb->cmnd[0] == WRITE_12) {
1656                 /*
1657                  * I don't think we'll ever see a WRITE_12 but support it anyway
1658                  */
1659                 block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
1660                         ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));
1661
1662                 blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
1663                          ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));
1664
1665                 US_DEBUGP("usbat_flash_transport: WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
1666                 return usbat_flash_write_data(us, info, block, blocks);
1667         }
1668
1669
1670         if (srb->cmnd[0] == TEST_UNIT_READY) {
1671                 US_DEBUGP("usbat_flash_transport: TEST_UNIT_READY.\n");
1672
1673                 rc = usbat_flash_check_media(us, info);
1674                 if (rc != USB_STOR_TRANSPORT_GOOD)
1675                         return rc;
1676
1677                 return usbat_check_status(us);
1678         }
1679
1680         if (srb->cmnd[0] == REQUEST_SENSE) {
1681                 US_DEBUGP("usbat_flash_transport: REQUEST_SENSE.\n");
1682
1683                 memset(ptr, 0, 18);
1684                 ptr[0] = 0xF0;
1685                 ptr[2] = info->sense_key;
1686                 ptr[7] = 11;
1687                 ptr[12] = info->sense_asc;
1688                 ptr[13] = info->sense_ascq;
1689                 usb_stor_set_xfer_buf(ptr, 18, srb);
1690
1691                 return USB_STOR_TRANSPORT_GOOD;
1692         }
1693
1694         if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
1695                 /*
1696                  * sure.  whatever.  not like we can stop the user from popping
1697                  * the media out of the device (no locking doors, etc)
1698                  */
1699                 return USB_STOR_TRANSPORT_GOOD;
1700         }
1701
1702         US_DEBUGP("usbat_flash_transport: Gah! Unknown command: %d (0x%x)\n",
1703                           srb->cmnd[0], srb->cmnd[0]);
1704         info->sense_key = 0x05;
1705         info->sense_asc = 0x20;
1706         info->sense_ascq = 0x00;
1707         return USB_STOR_TRANSPORT_FAILED;
1708 }
1709
1710 int init_usbat_cd(struct us_data *us)
1711 {
1712         return init_usbat(us, USBAT_DEV_HP8200);
1713 }
1714
1715
1716 int init_usbat_flash(struct us_data *us)
1717 {
1718         return init_usbat(us, USBAT_DEV_FLASH);
1719 }
1720
1721 int init_usbat_probe(struct us_data *us)
1722 {
1723         return init_usbat(us, 0);
1724 }
1725
1726 /*
1727  * Default transport function. Attempts to detect which transport function
1728  * should be called, makes it the new default, and calls it.
1729  *
1730  * This function should never be called. Our usbat_init() function detects the
1731  * device type and changes the us->transport ptr to the transport function
1732  * relevant to the device.
1733  * However, we'll support this impossible(?) case anyway.
1734  */
1735 int usbat_transport(struct scsi_cmnd *srb, struct us_data *us)
1736 {
1737         struct usbat_info *info = (struct usbat_info*) (us->extra);
1738
1739         if (usbat_set_transport(us, info, 0))
1740                 return USB_STOR_TRANSPORT_ERROR;
1741
1742         return us->transport(srb, us);
1743 }