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+/*
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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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+
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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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+
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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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+/*
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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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+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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+
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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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+
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+ memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
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+ memset(srb->cmnd, 0, sizeof(srb->cmnd));
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+
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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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+
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+ /* first build the ATACB command */
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+ srb->cmd_len = 16;
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+
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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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+
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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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+
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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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+
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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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+ }
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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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+
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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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+
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+
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+ usb_stor_transparent_scsi_command(srb, us);
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+
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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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+
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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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+
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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, 0);
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+ srb->sdb.length = sizeof(regs);
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+ sg_init_one(&ses.sense_sgl, regs, srb->sdb.length);
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+ srb->sdb.table.sgl = &ses.sense_sgl;
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+ srb->sc_data_direction = DMA_FROM_DEVICE;
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+ srb->sdb.table.nents = 1;
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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->cmnd[2] = 1;
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+
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+ usb_stor_transparent_scsi_command(srb, us);
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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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+
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+ /* build the sense */
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+ memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
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+
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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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+
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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 map)
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+ * and ata_to_sense_error from libata.
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+ */
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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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+
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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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+
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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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+
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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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+
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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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matthieu castet