linux/drivers/usb/storage/cypress_atacb.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Support for emulating SAT (ata pass through) on devices based
   4 *       on the Cypress USB/ATA bridge supporting ATACB.
   5 *
   6 * Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
   7 */
   8
   9#include <linux/module.h>
  10#include <scsi/scsi.h>
  11#include <scsi/scsi_cmnd.h>
  12#include <scsi/scsi_eh.h>
  13#include <linux/ata.h>
  14
  15#include "usb.h"
  16#include "protocol.h"
  17#include "scsiglue.h"
  18#include "debug.h"
  19
  20#define DRV_NAME "ums-cypress"
  21
  22MODULE_DESCRIPTION("SAT support for Cypress USB/ATA bridges with ATACB");
  23MODULE_AUTHOR("Matthieu Castet <castet.matthieu@free.fr>");
  24MODULE_LICENSE("GPL");
  25MODULE_IMPORT_NS(USB_STORAGE);
  26
  27/*
  28 * The table of devices
  29 */
  30#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
  31                    vendorName, productName, useProtocol, useTransport, \
  32                    initFunction, flags) \
  33{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  34  .driver_info = (flags) }
  35
  36static struct usb_device_id cypress_usb_ids[] = {
  37#       include "unusual_cypress.h"
  38        { }             /* Terminating entry */
  39};
  40MODULE_DEVICE_TABLE(usb, cypress_usb_ids);
  41
  42#undef UNUSUAL_DEV
  43
  44/*
  45 * The flags table
  46 */
  47#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
  48                    vendor_name, product_name, use_protocol, use_transport, \
  49                    init_function, Flags) \
  50{ \
  51        .vendorName = vendor_name,      \
  52        .productName = product_name,    \
  53        .useProtocol = use_protocol,    \
  54        .useTransport = use_transport,  \
  55        .initFunction = init_function,  \
  56}
  57
  58static struct us_unusual_dev cypress_unusual_dev_list[] = {
  59#       include "unusual_cypress.h"
  60        { }             /* Terminating entry */
  61};
  62
  63#undef UNUSUAL_DEV
  64
  65
  66/*
  67 * ATACB is a protocol used on cypress usb<->ata bridge to
  68 * send raw ATA command over mass storage
  69 * There is a ATACB2 protocol that support LBA48 on newer chip.
  70 * More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
  71 * datasheet from cypress.com.
  72 */
  73static void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
  74{
  75        unsigned char save_cmnd[MAX_COMMAND_SIZE];
  76
  77        if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
  78                usb_stor_transparent_scsi_command(srb, us);
  79                return;
  80        }
  81
  82        memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
  83        memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
  84
  85        /* check if we support the command */
  86        if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
  87                goto invalid_fld;
  88        /* check protocol */
  89        switch ((save_cmnd[1] >> 1) & 0xf) {
  90        case 3: /*no DATA */
  91        case 4: /* PIO in */
  92        case 5: /* PIO out */
  93                break;
  94        default:
  95                goto invalid_fld;
  96        }
  97
  98        /* first build the ATACB command */
  99        srb->cmd_len = 16;
 100
 101        srb->cmnd[0] = 0x24; /*
 102                              * bVSCBSignature : vendor-specific command
 103                              * this value can change, but most(all ?) manufacturers
 104                              * keep the cypress default : 0x24
 105                              */
 106        srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
 107
 108        srb->cmnd[3] = 0xff - 1; /*
 109                                  * features, sector count, lba low, lba med
 110                                  * lba high, device, command are valid
 111                                  */
 112        srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
 113
 114        if (save_cmnd[0] == ATA_16) {
 115                srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
 116                srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
 117                srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
 118                srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
 119                srb->cmnd[10] = save_cmnd[12]; /* lba high */
 120                srb->cmnd[11] = save_cmnd[13]; /* device */
 121                srb->cmnd[12] = save_cmnd[14]; /* command */
 122
 123                if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
 124                        /* this could be supported by atacb2 */
 125                        if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
 126                                        || save_cmnd[11])
 127                                goto invalid_fld;
 128                }
 129        } else { /* ATA12 */
 130                srb->cmnd[ 6] = save_cmnd[3]; /* features */
 131                srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
 132                srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
 133                srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
 134                srb->cmnd[10] = save_cmnd[7]; /* lba high */
 135                srb->cmnd[11] = save_cmnd[8]; /* device */
 136                srb->cmnd[12] = save_cmnd[9]; /* command */
 137
 138        }
 139        /* Filter SET_FEATURES - XFER MODE command */
 140        if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
 141                        && (srb->cmnd[6] == SETFEATURES_XFER))
 142                goto invalid_fld;
 143
 144        if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
 145                srb->cmnd[2] |= (1<<7); /* set  IdentifyPacketDevice for these cmds */
 146
 147
 148        usb_stor_transparent_scsi_command(srb, us);
 149
 150        /* if the device doesn't support ATACB */
 151        if (srb->result == SAM_STAT_CHECK_CONDITION &&
 152                        memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
 153                                sizeof(usb_stor_sense_invalidCDB)) == 0) {
 154                usb_stor_dbg(us, "cypress atacb not supported ???\n");
 155                goto end;
 156        }
 157
 158        /*
 159         * if ck_cond flags is set, and there wasn't critical error,
 160         * build the special sense
 161         */
 162        if ((srb->result != (DID_ERROR << 16) &&
 163                                srb->result != (DID_ABORT << 16)) &&
 164                        save_cmnd[2] & 0x20) {
 165                struct scsi_eh_save ses;
 166                unsigned char regs[8];
 167                unsigned char *sb = srb->sense_buffer;
 168                unsigned char *desc = sb + 8;
 169                int tmp_result;
 170
 171                /* build the command for reading the ATA registers */
 172                scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sizeof(regs));
 173
 174                /*
 175                 * we use the same command as before, but we set
 176                 * the read taskfile bit, for not executing atacb command,
 177                 * but reading register selected in srb->cmnd[4]
 178                 */
 179                srb->cmd_len = 16;
 180                srb->cmnd = ses.cmnd;
 181                srb->cmnd[2] = 1;
 182
 183                usb_stor_transparent_scsi_command(srb, us);
 184                memcpy(regs, srb->sense_buffer, sizeof(regs));
 185                tmp_result = srb->result;
 186                scsi_eh_restore_cmnd(srb, &ses);
 187                /* we fail to get registers, report invalid command */
 188                if (tmp_result != SAM_STAT_GOOD)
 189                        goto invalid_fld;
 190
 191                /* build the sense */
 192                memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
 193
 194                /* set sk, asc for a good command */
 195                sb[1] = RECOVERED_ERROR;
 196                sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
 197                sb[3] = 0x1D;
 198
 199                /*
 200                 * XXX we should generate sk, asc, ascq from status and error
 201                 * regs
 202                 * (see 11.1 Error translation ATA device error to SCSI error
 203                 * map, and ata_to_sense_error from libata.)
 204                 */
 205
 206                /* Sense data is current and format is descriptor. */
 207                sb[0] = 0x72;
 208                desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
 209
 210                /* set length of additional sense data */
 211                sb[7] = 14;
 212                desc[1] = 12;
 213
 214                /* Copy registers into sense buffer. */
 215                desc[ 2] = 0x00;
 216                desc[ 3] = regs[1];  /* features */
 217                desc[ 5] = regs[2];  /* sector count */
 218                desc[ 7] = regs[3];  /* lba low */
 219                desc[ 9] = regs[4];  /* lba med */
 220                desc[11] = regs[5];  /* lba high */
 221                desc[12] = regs[6];  /* device */
 222                desc[13] = regs[7];  /* command */
 223
 224                srb->result = SAM_STAT_CHECK_CONDITION;
 225        }
 226        goto end;
 227invalid_fld:
 228        srb->result = SAM_STAT_CHECK_CONDITION;
 229
 230        memcpy(srb->sense_buffer,
 231                        usb_stor_sense_invalidCDB,
 232                        sizeof(usb_stor_sense_invalidCDB));
 233end:
 234        memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
 235        if (srb->cmnd[0] == ATA_12)
 236                srb->cmd_len = 12;
 237}
 238
 239static struct scsi_host_template cypress_host_template;
 240
 241static int cypress_probe(struct usb_interface *intf,
 242                         const struct usb_device_id *id)
 243{
 244        struct us_data *us;
 245        int result;
 246        struct usb_device *device;
 247
 248        result = usb_stor_probe1(&us, intf, id,
 249                        (id - cypress_usb_ids) + cypress_unusual_dev_list,
 250                        &cypress_host_template);
 251        if (result)
 252                return result;
 253
 254        /*
 255         * Among CY7C68300 chips, the A revision does not support Cypress ATACB
 256         * Filter out this revision from EEPROM default descriptor values
 257         */
 258        device = interface_to_usbdev(intf);
 259        if (device->descriptor.iManufacturer != 0x38 ||
 260            device->descriptor.iProduct != 0x4e ||
 261            device->descriptor.iSerialNumber != 0x64) {
 262                us->protocol_name = "Transparent SCSI with Cypress ATACB";
 263                us->proto_handler = cypress_atacb_passthrough;
 264        } else {
 265                us->protocol_name = "Transparent SCSI";
 266                us->proto_handler = usb_stor_transparent_scsi_command;
 267        }
 268
 269        result = usb_stor_probe2(us);
 270        return result;
 271}
 272
 273static struct usb_driver cypress_driver = {
 274        .name =         DRV_NAME,
 275        .probe =        cypress_probe,
 276        .disconnect =   usb_stor_disconnect,
 277        .suspend =      usb_stor_suspend,
 278        .resume =       usb_stor_resume,
 279        .reset_resume = usb_stor_reset_resume,
 280        .pre_reset =    usb_stor_pre_reset,
 281        .post_reset =   usb_stor_post_reset,
 282        .id_table =     cypress_usb_ids,
 283        .soft_unbind =  1,
 284        .no_dynamic_id = 1,
 285};
 286
 287module_usb_stor_driver(cypress_driver, cypress_host_template, DRV_NAME);
 288