drivers/usb/storage/cypress_atacb.c

   1 /*
   2  * Support for emulating SAT (ata pass through) on devices based
   3  *       on the Cypress USB/ATA bridge supporting ATACB.
   4  *
   5  * Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <scsi/scsi.h>
  24 #include <scsi/scsi_cmnd.h>
  25 #include <scsi/scsi_eh.h>
  26 #include <linux/ata.h>
  27
  28 #include "usb.h"
  29 #include "protocol.h"
  30 #include "scsiglue.h"
  31 #include "debug.h"
  32
  33 #define DRV_NAME "ums-cypress"
  34
  35 MODULE_DESCRIPTION("SAT support for Cypress USB/ATA bridges with ATACB");
  36 MODULE_AUTHOR("Matthieu Castet <castet.matthieu@free.fr>");
  37 MODULE_LICENSE("GPL");
  38
  39 /*
  40  * The table of devices
  41  */
  42 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
  43                     vendorName, productName, useProtocol, useTransport, \
  44                     initFunction, flags) \
  45 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  46   .driver_info = (flags) }
  47
  48 static struct usb_device_id cypress_usb_ids[] = {
  49 #       include "unusual_cypress.h"
  50         { }             /* Terminating entry */
  51 };
  52 MODULE_DEVICE_TABLE(usb, cypress_usb_ids);
  53
  54 #undef UNUSUAL_DEV
  55
  56 /*
  57  * The flags table
  58  */
  59 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
  60                     vendor_name, product_name, use_protocol, use_transport, \
  61                     init_function, Flags) \
  62 { \
  63         .vendorName = vendor_name,      \
  64         .productName = product_name,    \
  65         .useProtocol = use_protocol,    \
  66         .useTransport = use_transport,  \
  67         .initFunction = init_function,  \
  68 }
  69
  70 static struct us_unusual_dev cypress_unusual_dev_list[] = {
  71 #       include "unusual_cypress.h"
  72         { }             /* Terminating entry */
  73 };
  74
  75 #undef UNUSUAL_DEV
  76
  77
  78 /*
  79  * ATACB is a protocol used on cypress usb<->ata bridge to
  80  * send raw ATA command over mass storage
  81  * There is a ATACB2 protocol that support LBA48 on newer chip.
  82  * More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
  83  * datasheet from cypress.com.
  84  */
  85 static void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
  86 {
  87         unsigned char save_cmnd[MAX_COMMAND_SIZE];
  88
  89         if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
  90                 usb_stor_transparent_scsi_command(srb, us);
  91                 return;
  92         }
  93
  94         memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
  95         memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
  96
  97         /* check if we support the command */
  98         if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
  99                 goto invalid_fld;
 100         /* check protocol */
 101         switch ((save_cmnd[1] >> 1) & 0xf) {
 102         case 3: /*no DATA */
 103         case 4: /* PIO in */
 104         case 5: /* PIO out */
 105                 break;
 106         default:
 107                 goto invalid_fld;
 108         }
 109
 110         /* first build the ATACB command */
 111         srb->cmd_len = 16;
 112
 113         srb->cmnd[0] = 0x24; /*
 114                               * bVSCBSignature : vendor-specific command
 115                               * this value can change, but most(all ?) manufacturers
 116                               * keep the cypress default : 0x24
 117                               */
 118         srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
 119
 120         srb->cmnd[3] = 0xff - 1; /*
 121                                   * features, sector count, lba low, lba med
 122                                   * lba high, device, command are valid
 123                                   */
 124         srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
 125
 126         if (save_cmnd[0] == ATA_16) {
 127                 srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
 128                 srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
 129                 srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
 130                 srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
 131                 srb->cmnd[10] = save_cmnd[12]; /* lba high */
 132                 srb->cmnd[11] = save_cmnd[13]; /* device */
 133                 srb->cmnd[12] = save_cmnd[14]; /* command */
 134
 135                 if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
 136                         /* this could be supported by atacb2 */
 137                         if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
 138                                         || save_cmnd[11])
 139                                 goto invalid_fld;
 140                 }
 141         } else { /* ATA12 */
 142                 srb->cmnd[ 6] = save_cmnd[3]; /* features */
 143                 srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
 144                 srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
 145                 srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
 146                 srb->cmnd[10] = save_cmnd[7]; /* lba high */
 147                 srb->cmnd[11] = save_cmnd[8]; /* device */
 148                 srb->cmnd[12] = save_cmnd[9]; /* command */
 149
 150         }
 151         /* Filter SET_FEATURES - XFER MODE command */
 152         if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
 153                         && (srb->cmnd[6] == SETFEATURES_XFER))
 154                 goto invalid_fld;
 155
 156         if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
 157                 srb->cmnd[2] |= (1<<7); /* set  IdentifyPacketDevice for these cmds */
 158
 159
 160         usb_stor_transparent_scsi_command(srb, us);
 161
 162         /* if the device doesn't support ATACB */
 163         if (srb->result == SAM_STAT_CHECK_CONDITION &&
 164                         memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
 165                                 sizeof(usb_stor_sense_invalidCDB)) == 0) {
 166                 usb_stor_dbg(us, "cypress atacb not supported ???\n");
 167                 goto end;
 168         }
 169
 170         /*
 171          * if ck_cond flags is set, and there wasn't critical error,
 172          * build the special sense
 173          */
 174         if ((srb->result != (DID_ERROR << 16) &&
 175                                 srb->result != (DID_ABORT << 16)) &&
 176                         save_cmnd[2] & 0x20) {
 177                 struct scsi_eh_save ses;
 178                 unsigned char regs[8];
 179                 unsigned char *sb = srb->sense_buffer;
 180                 unsigned char *desc = sb + 8;
 181                 int tmp_result;
 182
 183                 /* build the command for reading the ATA registers */
 184                 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sizeof(regs));
 185
 186                 /*
 187                  * we use the same command as before, but we set
 188                  * the read taskfile bit, for not executing atacb command,
 189                  * but reading register selected in srb->cmnd[4]
 190                  */
 191                 srb->cmd_len = 16;
 192                 srb->cmnd = ses.cmnd;
 193                 srb->cmnd[2] = 1;
 194
 195                 usb_stor_transparent_scsi_command(srb, us);
 196                 memcpy(regs, srb->sense_buffer, sizeof(regs));
 197                 tmp_result = srb->result;
 198                 scsi_eh_restore_cmnd(srb, &ses);
 199                 /* we fail to get registers, report invalid command */
 200                 if (tmp_result != SAM_STAT_GOOD)
 201                         goto invalid_fld;
 202
 203                 /* build the sense */
 204                 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 205
 206                 /* set sk, asc for a good command */
 207                 sb[1] = RECOVERED_ERROR;
 208                 sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
 209                 sb[3] = 0x1D;
 210
 211                 /*
 212                  * XXX we should generate sk, asc, ascq from status and error
 213                  * regs
 214                  * (see 11.1 Error translation ATA device error to SCSI error
 215                  * map, and ata_to_sense_error from libata.)
 216                  */
 217
 218                 /* Sense data is current and format is descriptor. */
 219                 sb[0] = 0x72;
 220                 desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
 221
 222                 /* set length of additional sense data */
 223                 sb[7] = 14;
 224                 desc[1] = 12;
 225
 226                 /* Copy registers into sense buffer. */
 227                 desc[ 2] = 0x00;
 228                 desc[ 3] = regs[1];  /* features */
 229                 desc[ 5] = regs[2];  /* sector count */
 230                 desc[ 7] = regs[3];  /* lba low */
 231                 desc[ 9] = regs[4];  /* lba med */
 232                 desc[11] = regs[5];  /* lba high */
 233                 desc[12] = regs[6];  /* device */
 234                 desc[13] = regs[7];  /* command */
 235
 236                 srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 237         }
 238         goto end;
 239 invalid_fld:
 240         srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
 241
 242         memcpy(srb->sense_buffer,
 243                         usb_stor_sense_invalidCDB,
 244                         sizeof(usb_stor_sense_invalidCDB));
 245 end:
 246         memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
 247         if (srb->cmnd[0] == ATA_12)
 248                 srb->cmd_len = 12;
 249 }
 250
 251 static struct scsi_host_template cypress_host_template;
 252
 253 static int cypress_probe(struct usb_interface *intf,
 254                          const struct usb_device_id *id)
 255 {
 256         struct us_data *us;
 257         int result;
 258         struct usb_device *device;
 259
 260         result = usb_stor_probe1(&us, intf, id,
 261                         (id - cypress_usb_ids) + cypress_unusual_dev_list,
 262                         &cypress_host_template);
 263         if (result)
 264                 return result;
 265
 266         /*
 267          * Among CY7C68300 chips, the A revision does not support Cypress ATACB
 268          * Filter out this revision from EEPROM default descriptor values
 269          */
 270         device = interface_to_usbdev(intf);
 271         if (device->descriptor.iManufacturer != 0x38 ||
 272             device->descriptor.iProduct != 0x4e ||
 273             device->descriptor.iSerialNumber != 0x64) {
 274                 us->protocol_name = "Transparent SCSI with Cypress ATACB";
 275                 us->proto_handler = cypress_atacb_passthrough;
 276         } else {
 277                 us->protocol_name = "Transparent SCSI";
 278                 us->proto_handler = usb_stor_transparent_scsi_command;
 279         }
 280
 281         result = usb_stor_probe2(us);
 282         return result;
 283 }
 284
 285 static struct usb_driver cypress_driver = {
 286         .name =         DRV_NAME,
 287         .probe =        cypress_probe,
 288         .disconnect =   usb_stor_disconnect,
 289         .suspend =      usb_stor_suspend,
 290         .resume =       usb_stor_resume,
 291         .reset_resume = usb_stor_reset_resume,
 292         .pre_reset =    usb_stor_pre_reset,
 293         .post_reset =   usb_stor_post_reset,
 294         .id_table =     cypress_usb_ids,
 295         .soft_unbind =  1,
 296         .no_dynamic_id = 1,
 297 };
 298
 299 module_usb_stor_driver(cypress_driver, cypress_host_template, DRV_NAME);