linux/drivers/usb/storage/cypress_atacb.c

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/*
* 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 <linux/module.h>
#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"
MODULE_DESCRIPTION("SAT support for Cypress USB/ATA bridges with ATACB");
MODULE_AUTHOR("Matthieu Castet <castet.matthieu@free.fr>");
MODULE_LICENSE("GPL");
/*
* The table of devices
*/
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
vendorName, productName, useProtocol, useTransport, \
initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
.driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
static struct usb_device_id cypress_usb_ids[] = {
# include "unusual_cypress.h"
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, cypress_usb_ids);
#undef UNUSUAL_DEV
/*
* The flags table
*/
#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
vendor_name, product_name, use_protocol, use_transport, \
init_function, Flags) \
{ \
.vendorName = vendor_name, \
.productName = product_name, \
.useProtocol = use_protocol, \
.useTransport = use_transport, \
.initFunction = init_function, \
}
static struct us_unusual_dev cypress_unusual_dev_list[] = {
# include "unusual_cypress.h"
{ } /* Terminating entry */
};
#undef UNUSUAL_DEV
/*
* 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.
*/
static 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));
[SCSI] Let scsi_cmnd->cmnd use request->cmd buffer - struct scsi_cmnd had a 16 bytes command buffer of its own. This is an unnecessary duplication and copy of request's cmd. It is probably left overs from the time that scsi_cmnd could function without a request attached. So clean that up. - Once above is done, few places, apart from scsi-ml, needed adjustments due to changing the data type of scsi_cmnd->cmnd. - Lots of drivers still use MAX_COMMAND_SIZE. So I have left that #define but equate it to BLK_MAX_CDB. The way I see it and is reflected in the patch below is. MAX_COMMAND_SIZE - means: The longest fixed-length (*) SCSI CDB as per the SCSI standard and is not related to the implementation. BLK_MAX_CDB. - The allocated space at the request level - I have audit all ISA drivers and made sure none use ->cmnd in a DMA Operation. Same audit was done by Andi Kleen. (*)fixed-length here means commands that their size can be determined by their opcode and the CDB does not carry a length specifier, (unlike the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly true and the SCSI standard also defines extended commands and vendor specific commands that can be bigger than 16 bytes. The kernel will support these using the same infrastructure used for VARLEN CDB's. So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml supports without specifying a cmd_len by ULD's Signed-off-by: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-04-30 08:19:47 +00:00
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, sizeof(regs));
/* 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->cmd_len = 16;
srb->cmnd = ses.cmnd;
srb->cmnd[2] = 1;
usb_stor_transparent_scsi_command(srb, us);
memcpy(regs, srb->sense_buffer, sizeof(regs));
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;
}
static int cypress_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct us_data *us;
int result;
result = usb_stor_probe1(&us, intf, id,
(id - cypress_usb_ids) + cypress_unusual_dev_list);
if (result)
return result;
us->protocol_name = "Transparent SCSI with Cypress ATACB";
us->proto_handler = cypress_atacb_passthrough;
result = usb_stor_probe2(us);
return result;
}
static struct usb_driver cypress_driver = {
.name = "ums-cypress",
.probe = cypress_probe,
.disconnect = usb_stor_disconnect,
.suspend = usb_stor_suspend,
.resume = usb_stor_resume,
.reset_resume = usb_stor_reset_resume,
.pre_reset = usb_stor_pre_reset,
.post_reset = usb_stor_post_reset,
.id_table = cypress_usb_ids,
.soft_unbind = 1,
.no_dynamic_id = 1,
};
module_usb_driver(cypress_driver);