286 lines
8.0 KiB
C
286 lines
8.0 KiB
C
/*
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* Support for emulating SAT (ata pass through) on devices based
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* on the Cypress USB/ATA bridge supporting ATACB.
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*
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* Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_eh.h>
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#include <linux/ata.h>
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#include "usb.h"
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#include "protocol.h"
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#include "scsiglue.h"
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#include "debug.h"
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/*
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* The table of devices
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*/
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#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
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vendorName, productName, useProtocol, useTransport, \
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initFunction, flags) \
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{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
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.driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
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struct usb_device_id cypress_usb_ids[] = {
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# include "unusual_cypress.h"
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, cypress_usb_ids);
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#undef UNUSUAL_DEV
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/*
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* The flags table
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*/
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#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
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vendor_name, product_name, use_protocol, use_transport, \
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init_function, Flags) \
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{ \
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.vendorName = vendor_name, \
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.productName = product_name, \
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.useProtocol = use_protocol, \
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.useTransport = use_transport, \
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.initFunction = init_function, \
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}
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static struct us_unusual_dev cypress_unusual_dev_list[] = {
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# include "unusual_cypress.h"
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{ } /* Terminating entry */
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};
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#undef UNUSUAL_DEV
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/*
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* ATACB is a protocol used on cypress usb<->ata bridge to
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* send raw ATA command over mass storage
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* There is a ATACB2 protocol that support LBA48 on newer chip.
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* More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
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* datasheet from cypress.com.
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*/
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static void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
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{
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unsigned char save_cmnd[MAX_COMMAND_SIZE];
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if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
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usb_stor_transparent_scsi_command(srb, us);
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return;
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}
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memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
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memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
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/* check if we support the command */
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if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
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goto invalid_fld;
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/* check protocol */
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switch((save_cmnd[1] >> 1) & 0xf) {
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case 3: /*no DATA */
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case 4: /* PIO in */
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case 5: /* PIO out */
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break;
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default:
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goto invalid_fld;
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}
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/* first build the ATACB command */
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srb->cmd_len = 16;
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srb->cmnd[0] = 0x24; /* bVSCBSignature : vendor-specific command
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this value can change, but most(all ?) manufacturers
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keep the cypress default : 0x24 */
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srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
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srb->cmnd[3] = 0xff - 1; /* features, sector count, lba low, lba med
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lba high, device, command are valid */
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srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
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if (save_cmnd[0] == ATA_16) {
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srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
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srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
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srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
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srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
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srb->cmnd[10] = save_cmnd[12]; /* lba high */
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srb->cmnd[11] = save_cmnd[13]; /* device */
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srb->cmnd[12] = save_cmnd[14]; /* command */
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if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
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/* this could be supported by atacb2 */
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if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
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|| save_cmnd[11])
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goto invalid_fld;
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}
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}
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else { /* ATA12 */
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srb->cmnd[ 6] = save_cmnd[3]; /* features */
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srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
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srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
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srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
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srb->cmnd[10] = save_cmnd[7]; /* lba high */
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srb->cmnd[11] = save_cmnd[8]; /* device */
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srb->cmnd[12] = save_cmnd[9]; /* command */
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}
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/* Filter SET_FEATURES - XFER MODE command */
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if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
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&& (srb->cmnd[6] == SETFEATURES_XFER))
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goto invalid_fld;
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if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
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srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */
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usb_stor_transparent_scsi_command(srb, us);
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/* if the device doesn't support ATACB
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*/
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if (srb->result == SAM_STAT_CHECK_CONDITION &&
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memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
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sizeof(usb_stor_sense_invalidCDB)) == 0) {
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US_DEBUGP("cypress atacb not supported ???\n");
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goto end;
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}
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/* if ck_cond flags is set, and there wasn't critical error,
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* build the special sense
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*/
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if ((srb->result != (DID_ERROR << 16) &&
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srb->result != (DID_ABORT << 16)) &&
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save_cmnd[2] & 0x20) {
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struct scsi_eh_save ses;
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unsigned char regs[8];
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unsigned char *sb = srb->sense_buffer;
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unsigned char *desc = sb + 8;
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int tmp_result;
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/* build the command for
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* reading the ATA registers */
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scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sizeof(regs));
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/* we use the same command as before, but we set
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* the read taskfile bit, for not executing atacb command,
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* but reading register selected in srb->cmnd[4]
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*/
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srb->cmd_len = 16;
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srb->cmnd = ses.cmnd;
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srb->cmnd[2] = 1;
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usb_stor_transparent_scsi_command(srb, us);
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memcpy(regs, srb->sense_buffer, sizeof(regs));
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tmp_result = srb->result;
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scsi_eh_restore_cmnd(srb, &ses);
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/* we fail to get registers, report invalid command */
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if (tmp_result != SAM_STAT_GOOD)
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goto invalid_fld;
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/* build the sense */
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memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
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/* set sk, asc for a good command */
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sb[1] = RECOVERED_ERROR;
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sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
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sb[3] = 0x1D;
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/* XXX we should generate sk, asc, ascq from status and error
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* regs
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* (see 11.1 Error translation ATA device error to SCSI error
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* map, and ata_to_sense_error from libata.)
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*/
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/* Sense data is current and format is descriptor. */
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sb[0] = 0x72;
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desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
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/* set length of additional sense data */
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sb[7] = 14;
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desc[1] = 12;
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/* Copy registers into sense buffer. */
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desc[ 2] = 0x00;
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desc[ 3] = regs[1]; /* features */
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desc[ 5] = regs[2]; /* sector count */
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desc[ 7] = regs[3]; /* lba low */
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desc[ 9] = regs[4]; /* lba med */
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desc[11] = regs[5]; /* lba high */
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desc[12] = regs[6]; /* device */
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desc[13] = regs[7]; /* command */
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srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
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}
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goto end;
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invalid_fld:
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srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
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memcpy(srb->sense_buffer,
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usb_stor_sense_invalidCDB,
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sizeof(usb_stor_sense_invalidCDB));
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end:
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memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
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if (srb->cmnd[0] == ATA_12)
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srb->cmd_len = 12;
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}
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static int cypress_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct us_data *us;
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int result;
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result = usb_stor_probe1(&us, intf, id,
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(id - cypress_usb_ids) + cypress_unusual_dev_list);
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if (result)
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return result;
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us->protocol_name = "Transparent SCSI with Cypress ATACB";
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us->proto_handler = cypress_atacb_passthrough;
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result = usb_stor_probe2(us);
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return result;
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}
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static struct usb_driver cypress_driver = {
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.name = "ums-cypress",
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.probe = cypress_probe,
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.disconnect = usb_stor_disconnect,
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.suspend = usb_stor_suspend,
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.resume = usb_stor_resume,
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.reset_resume = usb_stor_reset_resume,
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.pre_reset = usb_stor_pre_reset,
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.post_reset = usb_stor_post_reset,
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.id_table = cypress_usb_ids,
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.soft_unbind = 1,
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};
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static int __init cypress_init(void)
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{
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return usb_register(&cypress_driver);
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}
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static void __exit cypress_exit(void)
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{
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usb_deregister(&cypress_driver);
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}
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module_init(cypress_init);
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module_exit(cypress_exit);
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