201 lines
6.2 KiB
C
201 lines
6.2 KiB
C
/*
|
||
* Support for emulating SAT (ata pass through) on devices based
|
||
* on the Cypress USB/ATA bridge supporting ATACB.
|
||
*
|
||
* Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
|
||
*
|
||
* This program is free software; you can redistribute it and/or modify it
|
||
* under the terms of the GNU General Public License as published by the
|
||
* Free Software Foundation; either version 2, or (at your option) any
|
||
* later version.
|
||
*
|
||
* This program is distributed in the hope that it will be useful, but
|
||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
* General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License along
|
||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
*/
|
||
|
||
#include <scsi/scsi.h>
|
||
#include <scsi/scsi_cmnd.h>
|
||
#include <scsi/scsi_eh.h>
|
||
#include <linux/ata.h>
|
||
|
||
#include "usb.h"
|
||
#include "protocol.h"
|
||
#include "scsiglue.h"
|
||
#include "debug.h"
|
||
|
||
/*
|
||
* ATACB is a protocol used on cypress usb<->ata bridge to
|
||
* send raw ATA command over mass storage
|
||
* There is a ATACB2 protocol that support LBA48 on newer chip.
|
||
* More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
|
||
* datasheet from cypress.com.
|
||
*/
|
||
void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
|
||
{
|
||
unsigned char save_cmnd[MAX_COMMAND_SIZE];
|
||
|
||
if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
|
||
usb_stor_transparent_scsi_command(srb, us);
|
||
return;
|
||
}
|
||
|
||
memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
|
||
memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
|
||
|
||
/* check if we support the command */
|
||
if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
|
||
goto invalid_fld;
|
||
/* check protocol */
|
||
switch((save_cmnd[1] >> 1) & 0xf) {
|
||
case 3: /*no DATA */
|
||
case 4: /* PIO in */
|
||
case 5: /* PIO out */
|
||
break;
|
||
default:
|
||
goto invalid_fld;
|
||
}
|
||
|
||
/* first build the ATACB command */
|
||
srb->cmd_len = 16;
|
||
|
||
srb->cmnd[0] = 0x24; /* bVSCBSignature : vendor-specific command
|
||
this value can change, but most(all ?) manufacturers
|
||
keep the cypress default : 0x24 */
|
||
srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
|
||
|
||
srb->cmnd[3] = 0xff - 1; /* features, sector count, lba low, lba med
|
||
lba high, device, command are valid */
|
||
srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
|
||
|
||
if (save_cmnd[0] == ATA_16) {
|
||
srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
|
||
srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
|
||
srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
|
||
srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
|
||
srb->cmnd[10] = save_cmnd[12]; /* lba high */
|
||
srb->cmnd[11] = save_cmnd[13]; /* device */
|
||
srb->cmnd[12] = save_cmnd[14]; /* command */
|
||
|
||
if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
|
||
/* this could be supported by atacb2 */
|
||
if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
|
||
|| save_cmnd[11])
|
||
goto invalid_fld;
|
||
}
|
||
}
|
||
else { /* ATA12 */
|
||
srb->cmnd[ 6] = save_cmnd[3]; /* features */
|
||
srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
|
||
srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
|
||
srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
|
||
srb->cmnd[10] = save_cmnd[7]; /* lba high */
|
||
srb->cmnd[11] = save_cmnd[8]; /* device */
|
||
srb->cmnd[12] = save_cmnd[9]; /* command */
|
||
|
||
}
|
||
/* Filter SET_FEATURES - XFER MODE command */
|
||
if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
|
||
&& (srb->cmnd[6] == SETFEATURES_XFER))
|
||
goto invalid_fld;
|
||
|
||
if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
|
||
srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */
|
||
|
||
|
||
usb_stor_transparent_scsi_command(srb, us);
|
||
|
||
/* if the device doesn't support ATACB
|
||
*/
|
||
if (srb->result == SAM_STAT_CHECK_CONDITION &&
|
||
memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
|
||
sizeof(usb_stor_sense_invalidCDB)) == 0) {
|
||
US_DEBUGP("cypress atacb not supported ???\n");
|
||
goto end;
|
||
}
|
||
|
||
/* if ck_cond flags is set, and there wasn't critical error,
|
||
* build the special sense
|
||
*/
|
||
if ((srb->result != (DID_ERROR << 16) &&
|
||
srb->result != (DID_ABORT << 16)) &&
|
||
save_cmnd[2] & 0x20) {
|
||
struct scsi_eh_save ses;
|
||
unsigned char regs[8];
|
||
unsigned char *sb = srb->sense_buffer;
|
||
unsigned char *desc = sb + 8;
|
||
int tmp_result;
|
||
|
||
/* build the command for
|
||
* reading the ATA registers */
|
||
scsi_eh_prep_cmnd(srb, &ses, NULL, 0, 0);
|
||
srb->sdb.length = sizeof(regs);
|
||
sg_init_one(&ses.sense_sgl, regs, srb->sdb.length);
|
||
srb->sdb.table.sgl = &ses.sense_sgl;
|
||
srb->sc_data_direction = DMA_FROM_DEVICE;
|
||
srb->sdb.table.nents = 1;
|
||
/* we use the same command as before, but we set
|
||
* the read taskfile bit, for not executing atacb command,
|
||
* but reading register selected in srb->cmnd[4]
|
||
*/
|
||
srb->cmnd[2] = 1;
|
||
|
||
usb_stor_transparent_scsi_command(srb, us);
|
||
tmp_result = srb->result;
|
||
scsi_eh_restore_cmnd(srb, &ses);
|
||
/* we fail to get registers, report invalid command */
|
||
if (tmp_result != SAM_STAT_GOOD)
|
||
goto invalid_fld;
|
||
|
||
/* build the sense */
|
||
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
|
||
|
||
/* set sk, asc for a good command */
|
||
sb[1] = RECOVERED_ERROR;
|
||
sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
|
||
sb[3] = 0x1D;
|
||
|
||
/* XXX we should generate sk, asc, ascq from status and error
|
||
* regs
|
||
* (see 11.1 Error translation <20> ATA device error to SCSI error map)
|
||
* and ata_to_sense_error from libata.
|
||
*/
|
||
|
||
/* Sense data is current and format is descriptor. */
|
||
sb[0] = 0x72;
|
||
desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
|
||
|
||
/* set length of additional sense data */
|
||
sb[7] = 14;
|
||
desc[1] = 12;
|
||
|
||
/* Copy registers into sense buffer. */
|
||
desc[ 2] = 0x00;
|
||
desc[ 3] = regs[1]; /* features */
|
||
desc[ 5] = regs[2]; /* sector count */
|
||
desc[ 7] = regs[3]; /* lba low */
|
||
desc[ 9] = regs[4]; /* lba med */
|
||
desc[11] = regs[5]; /* lba high */
|
||
desc[12] = regs[6]; /* device */
|
||
desc[13] = regs[7]; /* command */
|
||
|
||
srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
|
||
}
|
||
goto end;
|
||
invalid_fld:
|
||
srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
|
||
|
||
memcpy(srb->sense_buffer,
|
||
usb_stor_sense_invalidCDB,
|
||
sizeof(usb_stor_sense_invalidCDB));
|
||
end:
|
||
memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
|
||
if (srb->cmnd[0] == ATA_12)
|
||
srb->cmd_len = 12;
|
||
}
|