I have got a cypress usb-ide bridge and I would like to tune or monitor my disk with tools like hdparm, hddtemp or smartctl. My controller support a way to send raw ATA command to the disk with something call atacb (see http://download.cypress.com.edgesuite.net/design_resources/datasheets/contents/cy7c68300c_8.pdf). Atacb support can be added for each application, but there is some disadvantages : - all application need to be patched - A race is possible if there other accesses, because the emulation can be split in 2 atacb scsi transactions. One for sending the command, one for reading the register (if ck_cond is set). I have implemented the emulation in usb-storage with a special proto_handler, and an unsual entry. Signed-off-by: Matthieu CASTET Index: linux-2.6/drivers/usb/storage/unusual_devs.h =================================================================== --- linux-2.6.orig/drivers/usb/storage/unusual_devs.h 2008-02-28 11:21:20.000000000 +0100 +++ linux-2.6/drivers/usb/storage/unusual_devs.h 2008-03-13 21:19:21.000000000 +0100 @@ -1620,6 +1620,14 @@ US_SC_DEVICE, US_PR_DEVICE, NULL, US_FL_CAPACITY_HEURISTICS), +#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB +UNUSUAL_DEV( 0x04b4, 0x6830, 0x0000, 0x9999, + "Cypress", + "Cypress AT2LP", + US_SC_CYP_ATACB, US_PR_BULK, NULL, + 0), +#endif + /* Control/Bulk transport for all SubClass values */ USUAL_DEV(US_SC_RBC, US_PR_CB, USB_US_TYPE_STOR), USUAL_DEV(US_SC_8020, US_PR_CB, USB_US_TYPE_STOR), Index: linux-2.6/drivers/usb/storage/cypress_atacb.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6/drivers/usb/storage/cypress_atacb.c 2008-03-19 19:34:11.000000000 +0100 @@ -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 +#include +#include +#include + +#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; +} Index: linux-2.6/drivers/usb/storage/cypress_atacb.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6/drivers/usb/storage/cypress_atacb.h 2008-03-13 21:19:21.000000000 +0100 @@ -0,0 +1,25 @@ +/* + * 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. + */ + +#ifndef _CYPRESS_ATACB_H_ +#define _CYPRESS_ATACB_H_ +extern void cypress_atacb_passthrough(struct scsi_cmnd*, struct us_data*); +#endif Index: linux-2.6/drivers/usb/storage/Kconfig =================================================================== --- linux-2.6.orig/drivers/usb/storage/Kconfig 2007-11-29 11:03:48.000000000 +0100 +++ linux-2.6/drivers/usb/storage/Kconfig 2008-03-13 21:19:21.000000000 +0100 @@ -145,6 +145,17 @@ on the resulting scsi device node returns the Karma to normal operation. +config USB_STORAGE_CYPRESS_ATACB + bool "SAT emulation on Cypress USB/ATA Bridge with ATACB" + depends on USB_STORAGE + ---help--- + Say Y here if you want to use SAT (ata pass through) on devices based + on the Cypress USB/ATA bridge supporting ATACB. This will allow you + to use tools to tune and monitor your drive (like hdparm or smartctl). + + If you say no here your device will still work with the standard usb + mass storage class. + config USB_LIBUSUAL bool "The shared table of common (or usual) storage devices" depends on USB Index: linux-2.6/drivers/usb/storage/Makefile =================================================================== --- linux-2.6.orig/drivers/usb/storage/Makefile 2007-06-08 14:22:39.000000000 +0200 +++ linux-2.6/drivers/usb/storage/Makefile 2008-03-13 21:19:21.000000000 +0100 @@ -21,6 +21,7 @@ usb-storage-obj-$(CONFIG_USB_STORAGE_ALAUDA) += alauda.o usb-storage-obj-$(CONFIG_USB_STORAGE_ONETOUCH) += onetouch.o usb-storage-obj-$(CONFIG_USB_STORAGE_KARMA) += karma.o +usb-storage-obj-$(CONFIG_USB_STORAGE_CYPRESS_ATACB) += cypress_atacb.o usb-storage-objs := scsiglue.o protocol.o transport.o usb.o \ initializers.o $(usb-storage-obj-y) Index: linux-2.6/drivers/usb/storage/scsiglue.c =================================================================== --- linux-2.6.orig/drivers/usb/storage/scsiglue.c 2008-02-05 09:42:21.000000000 +0100 +++ linux-2.6/drivers/usb/storage/scsiglue.c 2008-03-13 21:19:21.000000000 +0100 @@ -132,7 +132,7 @@ /* Disk-type devices use MODE SENSE(6) if the protocol * (SubClass) is Transparent SCSI, otherwise they use * MODE SENSE(10). */ - if (us->subclass != US_SC_SCSI) + if (us->subclass != US_SC_SCSI && us->subclass != US_SC_CYP_ATACB) sdev->use_10_for_ms = 1; /* Many disks only accept MODE SENSE transfer lengths of Index: linux-2.6/drivers/usb/storage/transport.c =================================================================== --- linux-2.6.orig/drivers/usb/storage/transport.c 2008-02-28 11:21:20.000000000 +0100 +++ linux-2.6/drivers/usb/storage/transport.c 2008-03-13 21:19:21.000000000 +0100 @@ -603,7 +603,8 @@ scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE); /* FIXME: we must do the protocol translation here */ - if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI) + if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI || + us->subclass == US_SC_CYP_ATACB) srb->cmd_len = 6; else srb->cmd_len = 12; Index: linux-2.6/drivers/usb/storage/usb.c =================================================================== --- linux-2.6.orig/drivers/usb/storage/usb.c 2007-11-29 11:03:48.000000000 +0100 +++ linux-2.6/drivers/usb/storage/usb.c 2008-03-13 21:19:21.000000000 +0100 @@ -101,6 +101,9 @@ #ifdef CONFIG_USB_STORAGE_KARMA #include "karma.h" #endif +#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB +#include "cypress_atacb.h" +#endif /* Some informational data */ MODULE_AUTHOR("Matthew Dharm "); @@ -708,6 +711,13 @@ break; #endif +#ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB + case US_SC_CYP_ATACB: + us->protocol_name = "Transparent SCSI with Cypress ATACB"; + us->proto_handler = cypress_atacb_passthrough; + break; +#endif + default: return -EIO; } Index: linux-2.6/include/linux/usb_usual.h =================================================================== --- linux-2.6.orig/include/linux/usb_usual.h 2008-02-05 09:42:23.000000000 +0100 +++ linux-2.6/include/linux/usb_usual.h 2008-03-13 21:20:33.000000000 +0100 @@ -83,6 +83,7 @@ #define US_SC_LOCKABLE 0x07 /* Password-protected */ #define US_SC_ISD200 0xf0 /* ISD200 ATA */ +#define US_SC_CYP_ATACB 0xf1 /* Cypress ATACB */ #define US_SC_DEVICE 0xff /* Use device's value */ /* Protocols */