diff options
Diffstat (limited to 'drivers/usb/storage/cypress_atacb.c')
| -rw-r--r-- | drivers/usb/storage/cypress_atacb.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/usb/storage/cypress_atacb.c b/drivers/usb/storage/cypress_atacb.c new file mode 100644 index 00000000000..d88824b3511 --- /dev/null +++ b/drivers/usb/storage/cypress_atacb.c @@ -0,0 +1,200 @@ +/* + * 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, sizeof(srb->cmnd)); + + /* 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 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; +} |