drivers/usb/storage/freecom.c

   1 /* Driver for Freecom USB/IDE adaptor
   2  *
   3  * Freecom v0.1:
   4  *
   5  * First release
   6  *
   7  * Current development and maintenance by:
   8  *   (C) 2000 David Brown <usb-storage@davidb.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2, or (at your option) any
  13  * later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * This driver was developed with information provided in FREECOM's USB
  25  * Programmers Reference Guide.  For further information contact Freecom
  26  * (http://www.freecom.de/)
  27  */
  28
  29 #include <linux/module.h>
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_cmnd.h>
  32
  33 #include "usb.h"
  34 #include "transport.h"
  35 #include "protocol.h"
  36 #include "debug.h"
  37
  38 MODULE_DESCRIPTION("Driver for Freecom USB/IDE adaptor");
  39 MODULE_AUTHOR("David Brown <usb-storage@davidb.org>");
  40 MODULE_LICENSE("GPL");
  41
  42 #ifdef CONFIG_USB_STORAGE_DEBUG
  43 static void pdump(struct us_data *us, void *ibuffer, int length);
  44 #endif
  45
  46 /* Bits of HD_STATUS */
  47 #define ERR_STAT                0x01
  48 #define DRQ_STAT                0x08
  49
  50 /* All of the outgoing packets are 64 bytes long. */
  51 struct freecom_cb_wrap {
  52         u8    Type;             /* Command type. */
  53         u8    Timeout;          /* Timeout in seconds. */
  54         u8    Atapi[12];        /* An ATAPI packet. */
  55         u8    Filler[50];       /* Padding Data. */
  56 };
  57
  58 struct freecom_xfer_wrap {
  59         u8    Type;             /* Command type. */
  60         u8    Timeout;          /* Timeout in seconds. */
  61         __le32   Count;         /* Number of bytes to transfer. */
  62         u8    Pad[58];
  63 } __attribute__ ((packed));
  64
  65 struct freecom_ide_out {
  66         u8    Type;             /* Type + IDE register. */
  67         u8    Pad;
  68         __le16   Value;         /* Value to write. */
  69         u8    Pad2[60];
  70 };
  71
  72 struct freecom_ide_in {
  73         u8    Type;             /* Type | IDE register. */
  74         u8    Pad[63];
  75 };
  76
  77 struct freecom_status {
  78         u8    Status;
  79         u8    Reason;
  80         __le16   Count;
  81         u8    Pad[60];
  82 };
  83
  84 /* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
  85  * register. */
  86 #define FCM_INT_STATUS          0x02 /* INDEX_STAT */
  87 #define FCM_STATUS_BUSY         0x80
  88
  89 /* These are the packet types.  The low bit indicates that this command
  90  * should wait for an interrupt. */
  91 #define FCM_PACKET_ATAPI        0x21
  92 #define FCM_PACKET_STATUS       0x20
  93
  94 /* Receive data from the IDE interface.  The ATAPI packet has already
  95  * waited, so the data should be immediately available. */
  96 #define FCM_PACKET_INPUT        0x81
  97
  98 /* Send data to the IDE interface. */
  99 #define FCM_PACKET_OUTPUT       0x01
 100
 101 /* Write a value to an ide register.  Or the ide register to write after
 102  * munging the address a bit. */
 103 #define FCM_PACKET_IDE_WRITE    0x40
 104 #define FCM_PACKET_IDE_READ     0xC0
 105
 106 /* All packets (except for status) are 64 bytes long. */
 107 #define FCM_PACKET_LENGTH               64
 108 #define FCM_STATUS_PACKET_LENGTH        4
 109
 110 static int init_freecom(struct us_data *us);
 111
 112
 113 /*
 114  * The table of devices
 115  */
 116 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 117                     vendorName, productName, useProtocol, useTransport, \
 118                     initFunction, flags) \
 119 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 120   .driver_info = (flags) }
 121
 122 static struct usb_device_id freecom_usb_ids[] = {
 123 #       include "unusual_freecom.h"
 124         { }             /* Terminating entry */
 125 };
 126 MODULE_DEVICE_TABLE(usb, freecom_usb_ids);
 127
 128 #undef UNUSUAL_DEV
 129
 130 /*
 131  * The flags table
 132  */
 133 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 134                     vendor_name, product_name, use_protocol, use_transport, \
 135                     init_function, Flags) \
 136 { \
 137         .vendorName = vendor_name,      \
 138         .productName = product_name,    \
 139         .useProtocol = use_protocol,    \
 140         .useTransport = use_transport,  \
 141         .initFunction = init_function,  \
 142 }
 143
 144 static struct us_unusual_dev freecom_unusual_dev_list[] = {
 145 #       include "unusual_freecom.h"
 146         { }             /* Terminating entry */
 147 };
 148
 149 #undef UNUSUAL_DEV
 150
 151 static int
 152 freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
 153                 unsigned int ipipe, unsigned int opipe, int count)
 154 {
 155         struct freecom_xfer_wrap *fxfr =
 156                 (struct freecom_xfer_wrap *) us->iobuf;
 157         int result;
 158
 159         fxfr->Type = FCM_PACKET_INPUT | 0x00;
 160         fxfr->Timeout = 0;    /* Short timeout for debugging. */
 161         fxfr->Count = cpu_to_le32 (count);
 162         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
 163
 164         usb_stor_dbg(us, "Read data Freecom! (c=%d)\n", count);
 165
 166         /* Issue the transfer command. */
 167         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 168                         FCM_PACKET_LENGTH, NULL);
 169         if (result != USB_STOR_XFER_GOOD) {
 170                 usb_stor_dbg(us, "Freecom readdata transport error\n");
 171                 return USB_STOR_TRANSPORT_ERROR;
 172         }
 173
 174         /* Now transfer all of our blocks. */
 175         usb_stor_dbg(us, "Start of read\n");
 176         result = usb_stor_bulk_srb(us, ipipe, srb);
 177         usb_stor_dbg(us, "freecom_readdata done!\n");
 178
 179         if (result > USB_STOR_XFER_SHORT)
 180                 return USB_STOR_TRANSPORT_ERROR;
 181         return USB_STOR_TRANSPORT_GOOD;
 182 }
 183
 184 static int
 185 freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
 186                 int unsigned ipipe, unsigned int opipe, int count)
 187 {
 188         struct freecom_xfer_wrap *fxfr =
 189                 (struct freecom_xfer_wrap *) us->iobuf;
 190         int result;
 191
 192         fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
 193         fxfr->Timeout = 0;    /* Short timeout for debugging. */
 194         fxfr->Count = cpu_to_le32 (count);
 195         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
 196
 197         usb_stor_dbg(us, "Write data Freecom! (c=%d)\n", count);
 198
 199         /* Issue the transfer command. */
 200         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 201                         FCM_PACKET_LENGTH, NULL);
 202         if (result != USB_STOR_XFER_GOOD) {
 203                 usb_stor_dbg(us, "Freecom writedata transport error\n");
 204                 return USB_STOR_TRANSPORT_ERROR;
 205         }
 206
 207         /* Now transfer all of our blocks. */
 208         usb_stor_dbg(us, "Start of write\n");
 209         result = usb_stor_bulk_srb(us, opipe, srb);
 210
 211         usb_stor_dbg(us, "freecom_writedata done!\n");
 212         if (result > USB_STOR_XFER_SHORT)
 213                 return USB_STOR_TRANSPORT_ERROR;
 214         return USB_STOR_TRANSPORT_GOOD;
 215 }
 216
 217 /*
 218  * Transport for the Freecom USB/IDE adaptor.
 219  *
 220  */
 221 static int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
 222 {
 223         struct freecom_cb_wrap *fcb;
 224         struct freecom_status  *fst;
 225         unsigned int ipipe, opipe;              /* We need both pipes. */
 226         int result;
 227         unsigned int partial;
 228         int length;
 229
 230         fcb = (struct freecom_cb_wrap *) us->iobuf;
 231         fst = (struct freecom_status *) us->iobuf;
 232
 233         usb_stor_dbg(us, "Freecom TRANSPORT STARTED\n");
 234
 235         /* Get handles for both transports. */
 236         opipe = us->send_bulk_pipe;
 237         ipipe = us->recv_bulk_pipe;
 238
 239         /* The ATAPI Command always goes out first. */
 240         fcb->Type = FCM_PACKET_ATAPI | 0x00;
 241         fcb->Timeout = 0;
 242         memcpy (fcb->Atapi, srb->cmnd, 12);
 243         memset (fcb->Filler, 0, sizeof (fcb->Filler));
 244
 245         US_DEBUG(pdump(us, srb->cmnd, 12));
 246
 247         /* Send it out. */
 248         result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 249                         FCM_PACKET_LENGTH, NULL);
 250
 251         /* The Freecom device will only fail if there is something wrong in
 252          * USB land.  It returns the status in its own registers, which
 253          * come back in the bulk pipe. */
 254         if (result != USB_STOR_XFER_GOOD) {
 255                 usb_stor_dbg(us, "freecom transport error\n");
 256                 return USB_STOR_TRANSPORT_ERROR;
 257         }
 258
 259         /* There are times we can optimize out this status read, but it
 260          * doesn't hurt us to always do it now. */
 261         result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 262                         FCM_STATUS_PACKET_LENGTH, &partial);
 263         usb_stor_dbg(us, "foo Status result %d %u\n", result, partial);
 264         if (result != USB_STOR_XFER_GOOD)
 265                 return USB_STOR_TRANSPORT_ERROR;
 266
 267         US_DEBUG(pdump(us, (void *)fst, partial));
 268
 269         /* The firmware will time-out commands after 20 seconds. Some commands
 270          * can legitimately take longer than this, so we use a different
 271          * command that only waits for the interrupt and then sends status,
 272          * without having to send a new ATAPI command to the device.
 273          *
 274          * NOTE: There is some indication that a data transfer after a timeout
 275          * may not work, but that is a condition that should never happen.
 276          */
 277         while (fst->Status & FCM_STATUS_BUSY) {
 278                 usb_stor_dbg(us, "20 second USB/ATAPI bridge TIMEOUT occurred!\n");
 279                 usb_stor_dbg(us, "fst->Status is %x\n", fst->Status);
 280
 281                 /* Get the status again */
 282                 fcb->Type = FCM_PACKET_STATUS;
 283                 fcb->Timeout = 0;
 284                 memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
 285                 memset (fcb->Filler, 0, sizeof (fcb->Filler));
 286
 287                 /* Send it out. */
 288                 result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 289                                 FCM_PACKET_LENGTH, NULL);
 290
 291                 /* The Freecom device will only fail if there is something
 292                  * wrong in USB land.  It returns the status in its own
 293                  * registers, which come back in the bulk pipe.
 294                  */
 295                 if (result != USB_STOR_XFER_GOOD) {
 296                         usb_stor_dbg(us, "freecom transport error\n");
 297                         return USB_STOR_TRANSPORT_ERROR;
 298                 }
 299
 300                 /* get the data */
 301                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 302                                 FCM_STATUS_PACKET_LENGTH, &partial);
 303
 304                 usb_stor_dbg(us, "bar Status result %d %u\n", result, partial);
 305                 if (result != USB_STOR_XFER_GOOD)
 306                         return USB_STOR_TRANSPORT_ERROR;
 307
 308                 US_DEBUG(pdump(us, (void *)fst, partial));
 309         }
 310
 311         if (partial != 4)
 312                 return USB_STOR_TRANSPORT_ERROR;
 313         if ((fst->Status & 1) != 0) {
 314                 usb_stor_dbg(us, "operation failed\n");
 315                 return USB_STOR_TRANSPORT_FAILED;
 316         }
 317
 318         /* The device might not have as much data available as we
 319          * requested.  If you ask for more than the device has, this reads
 320          * and such will hang. */
 321         usb_stor_dbg(us, "Device indicates that it has %d bytes available\n",
 322                      le16_to_cpu(fst->Count));
 323         usb_stor_dbg(us, "SCSI requested %d\n", scsi_bufflen(srb));
 324
 325         /* Find the length we desire to read. */
 326         switch (srb->cmnd[0]) {
 327         case INQUIRY:
 328         case REQUEST_SENSE:     /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
 329         case MODE_SENSE:
 330         case MODE_SENSE_10:
 331                 length = le16_to_cpu(fst->Count);
 332                 break;
 333         default:
 334                 length = scsi_bufflen(srb);
 335         }
 336
 337         /* verify that this amount is legal */
 338         if (length > scsi_bufflen(srb)) {
 339                 length = scsi_bufflen(srb);
 340                 usb_stor_dbg(us, "Truncating request to match buffer length: %d\n",
 341                              length);
 342         }
 343
 344         /* What we do now depends on what direction the data is supposed to
 345          * move in. */
 346
 347         switch (us->srb->sc_data_direction) {
 348         case DMA_FROM_DEVICE:
 349                 /* catch bogus "read 0 length" case */
 350                 if (!length)
 351                         break;
 352                 /* Make sure that the status indicates that the device
 353                  * wants data as well. */
 354                 if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
 355                         usb_stor_dbg(us, "SCSI wants data, drive doesn't have any\n");
 356                         return USB_STOR_TRANSPORT_FAILED;
 357                 }
 358                 result = freecom_readdata (srb, us, ipipe, opipe, length);
 359                 if (result != USB_STOR_TRANSPORT_GOOD)
 360                         return result;
 361
 362                 usb_stor_dbg(us, "Waiting for status\n");
 363                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 364                                 FCM_PACKET_LENGTH, &partial);
 365                 US_DEBUG(pdump(us, (void *)fst, partial));
 366
 367                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
 368                         return USB_STOR_TRANSPORT_ERROR;
 369                 if ((fst->Status & ERR_STAT) != 0) {
 370                         usb_stor_dbg(us, "operation failed\n");
 371                         return USB_STOR_TRANSPORT_FAILED;
 372                 }
 373                 if ((fst->Reason & 3) != 3) {
 374                         usb_stor_dbg(us, "Drive seems still hungry\n");
 375                         return USB_STOR_TRANSPORT_FAILED;
 376                 }
 377                 usb_stor_dbg(us, "Transfer happy\n");
 378                 break;
 379
 380         case DMA_TO_DEVICE:
 381                 /* catch bogus "write 0 length" case */
 382                 if (!length)
 383                         break;
 384                 /* Make sure the status indicates that the device wants to
 385                  * send us data. */
 386                 /* !!IMPLEMENT!! */
 387                 result = freecom_writedata (srb, us, ipipe, opipe, length);
 388                 if (result != USB_STOR_TRANSPORT_GOOD)
 389                         return result;
 390
 391                 usb_stor_dbg(us, "Waiting for status\n");
 392                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 393                                 FCM_PACKET_LENGTH, &partial);
 394
 395                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
 396                         return USB_STOR_TRANSPORT_ERROR;
 397                 if ((fst->Status & ERR_STAT) != 0) {
 398                         usb_stor_dbg(us, "operation failed\n");
 399                         return USB_STOR_TRANSPORT_FAILED;
 400                 }
 401                 if ((fst->Reason & 3) != 3) {
 402                         usb_stor_dbg(us, "Drive seems still hungry\n");
 403                         return USB_STOR_TRANSPORT_FAILED;
 404                 }
 405
 406                 usb_stor_dbg(us, "Transfer happy\n");
 407                 break;
 408
 409
 410         case DMA_NONE:
 411                 /* Easy, do nothing. */
 412                 break;
 413
 414         default:
 415                 /* should never hit here -- filtered in usb.c */
 416                 usb_stor_dbg(us, "freecom unimplemented direction: %d\n",
 417                              us->srb->sc_data_direction);
 418                 /* Return fail, SCSI seems to handle this better. */
 419                 return USB_STOR_TRANSPORT_FAILED;
 420                 break;
 421         }
 422
 423         return USB_STOR_TRANSPORT_GOOD;
 424 }
 425
 426 static int init_freecom(struct us_data *us)
 427 {
 428         int result;
 429         char *buffer = us->iobuf;
 430
 431         /* The DMA-mapped I/O buffer is 64 bytes long, just right for
 432          * all our packets.  No need to allocate any extra buffer space.
 433          */
 434
 435         result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
 436                         0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
 437         buffer[32] = '\0';
 438         usb_stor_dbg(us, "String returned from FC init is: %s\n", buffer);
 439
 440         /* Special thanks to the people at Freecom for providing me with
 441          * this "magic sequence", which they use in their Windows and MacOS
 442          * drivers to make sure that all the attached perhiperals are
 443          * properly reset.
 444          */
 445
 446         /* send reset */
 447         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 448                         0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
 449         usb_stor_dbg(us, "result from activate reset is %d\n", result);
 450
 451         /* wait 250ms */
 452         mdelay(250);
 453
 454         /* clear reset */
 455         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 456                         0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
 457         usb_stor_dbg(us, "result from clear reset is %d\n", result);
 458
 459         /* wait 3 seconds */
 460         mdelay(3 * 1000);
 461
 462         return USB_STOR_TRANSPORT_GOOD;
 463 }
 464
 465 static int usb_stor_freecom_reset(struct us_data *us)
 466 {
 467         printk (KERN_CRIT "freecom reset called\n");
 468
 469         /* We don't really have this feature. */
 470         return FAILED;
 471 }
 472
 473 #ifdef CONFIG_USB_STORAGE_DEBUG
 474 static void pdump(struct us_data *us, void *ibuffer, int length)
 475 {
 476         static char line[80];
 477         int offset = 0;
 478         unsigned char *buffer = (unsigned char *) ibuffer;
 479         int i, j;
 480         int from, base;
 481
 482         offset = 0;
 483         for (i = 0; i < length; i++) {
 484                 if ((i & 15) == 0) {
 485                         if (i > 0) {
 486                                 offset += sprintf (line+offset, " - ");
 487                                 for (j = i - 16; j < i; j++) {
 488                                         if (buffer[j] >= 32 && buffer[j] <= 126)
 489                                                 line[offset++] = buffer[j];
 490                                         else
 491                                                 line[offset++] = '.';
 492                                 }
 493                                 line[offset] = 0;
 494                                 usb_stor_dbg(us, "%s\n", line);
 495                                 offset = 0;
 496                         }
 497                         offset += sprintf (line+offset, "%08x:", i);
 498                 } else if ((i & 7) == 0) {
 499                         offset += sprintf (line+offset, " -");
 500                 }
 501                 offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
 502         }
 503
 504         /* Add the last "chunk" of data. */
 505         from = (length - 1) % 16;
 506         base = ((length - 1) / 16) * 16;
 507
 508         for (i = from + 1; i < 16; i++)
 509                 offset += sprintf (line+offset, "   ");
 510         if (from < 8)
 511                 offset += sprintf (line+offset, "  ");
 512         offset += sprintf (line+offset, " - ");
 513
 514         for (i = 0; i <= from; i++) {
 515                 if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
 516                         line[offset++] = buffer[base+i];
 517                 else
 518                         line[offset++] = '.';
 519         }
 520         line[offset] = 0;
 521         usb_stor_dbg(us, "%s\n", line);
 522         offset = 0;
 523 }
 524 #endif
 525
 526 static int freecom_probe(struct usb_interface *intf,
 527                          const struct usb_device_id *id)
 528 {
 529         struct us_data *us;
 530         int result;
 531
 532         result = usb_stor_probe1(&us, intf, id,
 533                         (id - freecom_usb_ids) + freecom_unusual_dev_list);
 534         if (result)
 535                 return result;
 536
 537         us->transport_name = "Freecom";
 538         us->transport = freecom_transport;
 539         us->transport_reset = usb_stor_freecom_reset;
 540         us->max_lun = 0;
 541
 542         result = usb_stor_probe2(us);
 543         return result;
 544 }
 545
 546 static struct usb_driver freecom_driver = {
 547         .name =         "ums-freecom",
 548         .probe =        freecom_probe,
 549         .disconnect =   usb_stor_disconnect,
 550         .suspend =      usb_stor_suspend,
 551         .resume =       usb_stor_resume,
 552         .reset_resume = usb_stor_reset_resume,
 553         .pre_reset =    usb_stor_pre_reset,
 554         .post_reset =   usb_stor_post_reset,
 555         .id_table =     freecom_usb_ids,
 556         .soft_unbind =  1,
 557         .no_dynamic_id = 1,
 558 };
 559
 560 module_usb_driver(freecom_driver);