drivers/usb/storage/freecom.c

   1 /* Driver for Freecom USB/IDE adaptor
   2  *
   3  * $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $
   4  *
   5  * Freecom v0.1:
   6  *
   7  * First release
   8  *
   9  * Current development and maintenance by:
  10  *   (C) 2000 David Brown <usb-storage@davidb.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2, or (at your option) any
  15  * later version.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License along
  23  * with this program; if not, write to the Free Software Foundation, Inc.,
  24  * 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * This driver was developed with information provided in FREECOM's USB
  27  * Programmers Reference Guide.  For further information contact Freecom
  28  * (http://www.freecom.de/)
  29  */
  30
  31 #include <linux/hdreg.h>
  32
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_cmnd.h>
  35
  36 #include "usb.h"
  37 #include "transport.h"
  38 #include "protocol.h"
  39 #include "debug.h"
  40 #include "freecom.h"
  41
  42 #ifdef CONFIG_USB_STORAGE_DEBUG
  43 static void pdump (void *, int);
  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
 111 freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
 112                 unsigned int ipipe, unsigned int opipe, int count)
 113 {
 114         struct freecom_xfer_wrap *fxfr =
 115                 (struct freecom_xfer_wrap *) us->iobuf;
 116         int result;
 117
 118         fxfr->Type = FCM_PACKET_INPUT | 0x00;
 119         fxfr->Timeout = 0;    /* Short timeout for debugging. */
 120         fxfr->Count = cpu_to_le32 (count);
 121         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
 122
 123         US_DEBUGP("Read data Freecom! (c=%d)\n", count);
 124
 125         /* Issue the transfer command. */
 126         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 127                         FCM_PACKET_LENGTH, NULL);
 128         if (result != USB_STOR_XFER_GOOD) {
 129                 US_DEBUGP ("Freecom readdata transport error\n");
 130                 return USB_STOR_TRANSPORT_ERROR;
 131         }
 132
 133         /* Now transfer all of our blocks. */
 134         US_DEBUGP("Start of read\n");
 135         result = usb_stor_bulk_srb(us, ipipe, srb);
 136         US_DEBUGP("freecom_readdata done!\n");
 137
 138         if (result > USB_STOR_XFER_SHORT)
 139                 return USB_STOR_TRANSPORT_ERROR;
 140         return USB_STOR_TRANSPORT_GOOD;
 141 }
 142
 143 static int
 144 freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
 145                 int unsigned ipipe, unsigned int opipe, int count)
 146 {
 147         struct freecom_xfer_wrap *fxfr =
 148                 (struct freecom_xfer_wrap *) us->iobuf;
 149         int result;
 150
 151         fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
 152         fxfr->Timeout = 0;    /* Short timeout for debugging. */
 153         fxfr->Count = cpu_to_le32 (count);
 154         memset (fxfr->Pad, 0, sizeof (fxfr->Pad));
 155
 156         US_DEBUGP("Write data Freecom! (c=%d)\n", count);
 157
 158         /* Issue the transfer command. */
 159         result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 160                         FCM_PACKET_LENGTH, NULL);
 161         if (result != USB_STOR_XFER_GOOD) {
 162                 US_DEBUGP ("Freecom writedata transport error\n");
 163                 return USB_STOR_TRANSPORT_ERROR;
 164         }
 165
 166         /* Now transfer all of our blocks. */
 167         US_DEBUGP("Start of write\n");
 168         result = usb_stor_bulk_srb(us, opipe, srb);
 169
 170         US_DEBUGP("freecom_writedata done!\n");
 171         if (result > USB_STOR_XFER_SHORT)
 172                 return USB_STOR_TRANSPORT_ERROR;
 173         return USB_STOR_TRANSPORT_GOOD;
 174 }
 175
 176 /*
 177  * Transport for the Freecom USB/IDE adaptor.
 178  *
 179  */
 180 int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
 181 {
 182         struct freecom_cb_wrap *fcb;
 183         struct freecom_status  *fst;
 184         unsigned int ipipe, opipe;              /* We need both pipes. */
 185         int result;
 186         unsigned int partial;
 187         int length;
 188
 189         fcb = (struct freecom_cb_wrap *) us->iobuf;
 190         fst = (struct freecom_status *) us->iobuf;
 191
 192         US_DEBUGP("Freecom TRANSPORT STARTED\n");
 193
 194         /* Get handles for both transports. */
 195         opipe = us->send_bulk_pipe;
 196         ipipe = us->recv_bulk_pipe;
 197
 198         /* The ATAPI Command always goes out first. */
 199         fcb->Type = FCM_PACKET_ATAPI | 0x00;
 200         fcb->Timeout = 0;
 201         memcpy (fcb->Atapi, srb->cmnd, 12);
 202         memset (fcb->Filler, 0, sizeof (fcb->Filler));
 203
 204         US_DEBUG(pdump (srb->cmnd, 12));
 205
 206         /* Send it out. */
 207         result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 208                         FCM_PACKET_LENGTH, NULL);
 209
 210         /* The Freecom device will only fail if there is something wrong in
 211          * USB land.  It returns the status in its own registers, which
 212          * come back in the bulk pipe. */
 213         if (result != USB_STOR_XFER_GOOD) {
 214                 US_DEBUGP ("freecom transport error\n");
 215                 return USB_STOR_TRANSPORT_ERROR;
 216         }
 217
 218         /* There are times we can optimize out this status read, but it
 219          * doesn't hurt us to always do it now. */
 220         result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 221                         FCM_STATUS_PACKET_LENGTH, &partial);
 222         US_DEBUGP("foo Status result %d %u\n", result, partial);
 223         if (result != USB_STOR_XFER_GOOD)
 224                 return USB_STOR_TRANSPORT_ERROR;
 225
 226         US_DEBUG(pdump ((void *) fst, partial));
 227
 228         /* The firmware will time-out commands after 20 seconds. Some commands
 229          * can legitimately take longer than this, so we use a different
 230          * command that only waits for the interrupt and then sends status,
 231          * without having to send a new ATAPI command to the device.
 232          *
 233          * NOTE: There is some indication that a data transfer after a timeout
 234          * may not work, but that is a condition that should never happen.
 235          */
 236         while (fst->Status & FCM_STATUS_BUSY) {
 237                 US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
 238                 US_DEBUGP("fst->Status is %x\n", fst->Status);
 239
 240                 /* Get the status again */
 241                 fcb->Type = FCM_PACKET_STATUS;
 242                 fcb->Timeout = 0;
 243                 memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
 244                 memset (fcb->Filler, 0, sizeof (fcb->Filler));
 245
 246                 /* Send it out. */
 247                 result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 248                                 FCM_PACKET_LENGTH, NULL);
 249
 250                 /* The Freecom device will only fail if there is something
 251                  * wrong in USB land.  It returns the status in its own
 252                  * registers, which come back in the bulk pipe.
 253                  */
 254                 if (result != USB_STOR_XFER_GOOD) {
 255                         US_DEBUGP ("freecom transport error\n");
 256                         return USB_STOR_TRANSPORT_ERROR;
 257                 }
 258
 259                 /* get the data */
 260                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 261                                 FCM_STATUS_PACKET_LENGTH, &partial);
 262
 263                 US_DEBUGP("bar 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 ((void *) fst, partial));
 268         }
 269
 270         if (partial != 4)
 271                 return USB_STOR_TRANSPORT_ERROR;
 272         if ((fst->Status & 1) != 0) {
 273                 US_DEBUGP("operation failed\n");
 274                 return USB_STOR_TRANSPORT_FAILED;
 275         }
 276
 277         /* The device might not have as much data available as we
 278          * requested.  If you ask for more than the device has, this reads
 279          * and such will hang. */
 280         US_DEBUGP("Device indicates that it has %d bytes available\n",
 281                         le16_to_cpu (fst->Count));
 282         US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));
 283
 284         /* Find the length we desire to read. */
 285         switch (srb->cmnd[0]) {
 286                 case INQUIRY:
 287                 case REQUEST_SENSE:             /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
 288                 case MODE_SENSE:
 289                 case MODE_SENSE_10:
 290                         length = le16_to_cpu(fst->Count);
 291                         break;
 292                 default:
 293                         length = scsi_bufflen(srb);
 294         }
 295
 296         /* verify that this amount is legal */
 297         if (length > scsi_bufflen(srb)) {
 298                 length = scsi_bufflen(srb);
 299                 US_DEBUGP("Truncating request to match buffer length: %d\n", length);
 300         }
 301
 302         /* What we do now depends on what direction the data is supposed to
 303          * move in. */
 304
 305         switch (us->srb->sc_data_direction) {
 306         case DMA_FROM_DEVICE:
 307                 /* catch bogus "read 0 length" case */
 308                 if (!length)
 309                         break;
 310                 /* Make sure that the status indicates that the device
 311                  * wants data as well. */
 312                 if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
 313                         US_DEBUGP("SCSI wants data, drive doesn't have any\n");
 314                         return USB_STOR_TRANSPORT_FAILED;
 315                 }
 316                 result = freecom_readdata (srb, us, ipipe, opipe, length);
 317                 if (result != USB_STOR_TRANSPORT_GOOD)
 318                         return result;
 319
 320                 US_DEBUGP("FCM: Waiting for status\n");
 321                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 322                                 FCM_PACKET_LENGTH, &partial);
 323                 US_DEBUG(pdump ((void *) fst, partial));
 324
 325                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
 326                         return USB_STOR_TRANSPORT_ERROR;
 327                 if ((fst->Status & ERR_STAT) != 0) {
 328                         US_DEBUGP("operation failed\n");
 329                         return USB_STOR_TRANSPORT_FAILED;
 330                 }
 331                 if ((fst->Reason & 3) != 3) {
 332                         US_DEBUGP("Drive seems still hungry\n");
 333                         return USB_STOR_TRANSPORT_FAILED;
 334                 }
 335                 US_DEBUGP("Transfer happy\n");
 336                 break;
 337
 338         case DMA_TO_DEVICE:
 339                 /* catch bogus "write 0 length" case */
 340                 if (!length)
 341                         break;
 342                 /* Make sure the status indicates that the device wants to
 343                  * send us data. */
 344                 /* !!IMPLEMENT!! */
 345                 result = freecom_writedata (srb, us, ipipe, opipe, length);
 346                 if (result != USB_STOR_TRANSPORT_GOOD)
 347                         return result;
 348
 349                 US_DEBUGP("FCM: Waiting for status\n");
 350                 result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 351                                 FCM_PACKET_LENGTH, &partial);
 352
 353                 if (partial != 4 || result > USB_STOR_XFER_SHORT)
 354                         return USB_STOR_TRANSPORT_ERROR;
 355                 if ((fst->Status & ERR_STAT) != 0) {
 356                         US_DEBUGP("operation failed\n");
 357                         return USB_STOR_TRANSPORT_FAILED;
 358                 }
 359                 if ((fst->Reason & 3) != 3) {
 360                         US_DEBUGP("Drive seems still hungry\n");
 361                         return USB_STOR_TRANSPORT_FAILED;
 362                 }
 363
 364                 US_DEBUGP("Transfer happy\n");
 365                 break;
 366
 367
 368         case DMA_NONE:
 369                 /* Easy, do nothing. */
 370                 break;
 371
 372         default:
 373                 /* should never hit here -- filtered in usb.c */
 374                 US_DEBUGP ("freecom unimplemented direction: %d\n",
 375                                 us->srb->sc_data_direction);
 376                 // Return fail, SCSI seems to handle this better.
 377                 return USB_STOR_TRANSPORT_FAILED;
 378                 break;
 379         }
 380
 381         return USB_STOR_TRANSPORT_GOOD;
 382 }
 383
 384 int
 385 freecom_init (struct us_data *us)
 386 {
 387         int result;
 388         char *buffer = us->iobuf;
 389
 390         /* The DMA-mapped I/O buffer is 64 bytes long, just right for
 391          * all our packets.  No need to allocate any extra buffer space.
 392          */
 393
 394         result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
 395                         0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
 396         buffer[32] = '\0';
 397         US_DEBUGP("String returned from FC init is: %s\n", buffer);
 398
 399         /* Special thanks to the people at Freecom for providing me with
 400          * this "magic sequence", which they use in their Windows and MacOS
 401          * drivers to make sure that all the attached perhiperals are
 402          * properly reset.
 403          */
 404
 405         /* send reset */
 406         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 407                         0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
 408         US_DEBUGP("result from activate reset is %d\n", result);
 409
 410         /* wait 250ms */
 411         mdelay(250);
 412
 413         /* clear reset */
 414         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 415                         0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
 416         US_DEBUGP("result from clear reset is %d\n", result);
 417
 418         /* wait 3 seconds */
 419         mdelay(3 * 1000);
 420
 421         return USB_STOR_TRANSPORT_GOOD;
 422 }
 423
 424 int usb_stor_freecom_reset(struct us_data *us)
 425 {
 426         printk (KERN_CRIT "freecom reset called\n");
 427
 428         /* We don't really have this feature. */
 429         return FAILED;
 430 }
 431
 432 #ifdef CONFIG_USB_STORAGE_DEBUG
 433 static void pdump (void *ibuffer, int length)
 434 {
 435         static char line[80];
 436         int offset = 0;
 437         unsigned char *buffer = (unsigned char *) ibuffer;
 438         int i, j;
 439         int from, base;
 440
 441         offset = 0;
 442         for (i = 0; i < length; i++) {
 443                 if ((i & 15) == 0) {
 444                         if (i > 0) {
 445                                 offset += sprintf (line+offset, " - ");
 446                                 for (j = i - 16; j < i; j++) {
 447                                         if (buffer[j] >= 32 && buffer[j] <= 126)
 448                                                 line[offset++] = buffer[j];
 449                                         else
 450                                                 line[offset++] = '.';
 451                                 }
 452                                 line[offset] = 0;
 453                                 US_DEBUGP("%s\n", line);
 454                                 offset = 0;
 455                         }
 456                         offset += sprintf (line+offset, "%08x:", i);
 457                 }
 458                 else if ((i & 7) == 0) {
 459                         offset += sprintf (line+offset, " -");
 460                 }
 461                 offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
 462         }
 463
 464         /* Add the last "chunk" of data. */
 465         from = (length - 1) % 16;
 466         base = ((length - 1) / 16) * 16;
 467
 468         for (i = from + 1; i < 16; i++)
 469                 offset += sprintf (line+offset, "   ");
 470         if (from < 8)
 471                 offset += sprintf (line+offset, "  ");
 472         offset += sprintf (line+offset, " - ");
 473
 474         for (i = 0; i <= from; i++) {
 475                 if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
 476                         line[offset++] = buffer[base+i];
 477                 else
 478                         line[offset++] = '.';
 479         }
 480         line[offset] = 0;
 481         US_DEBUGP("%s\n", line);
 482         offset = 0;
 483 }
 484 #endif
 485