287 lines
8.0 KiB
C
287 lines
8.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* 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)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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"
|
||
|
|
|
||
|
|
#define DRV_NAME "ums-cypress"
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("SAT support for Cypress USB/ATA bridges with ATACB");
|
||
|
|
MODULE_AUTHOR("Matthieu Castet <castet.matthieu@free.fr>");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_IMPORT_NS(USB_STORAGE);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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) }
|
||
|
|
|
||
|
|
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));
|
||
|
|
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) {
|
||
|
|
usb_stor_dbg(us, "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[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 = SAM_STAT_CHECK_CONDITION;
|
||
|
|
}
|
||
|
|
goto end;
|
||
|
|
invalid_fld:
|
||
|
|
srb->result = 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 struct scsi_host_template cypress_host_template;
|
||
|
|
|
||
|
|
static int cypress_probe(struct usb_interface *intf,
|
||
|
|
const struct usb_device_id *id)
|
||
|
|
{
|
||
|
|
struct us_data *us;
|
||
|
|
int result;
|
||
|
|
struct usb_device *device;
|
||
|
|
|
||
|
|
result = usb_stor_probe1(&us, intf, id,
|
||
|
|
(id - cypress_usb_ids) + cypress_unusual_dev_list,
|
||
|
|
&cypress_host_template);
|
||
|
|
if (result)
|
||
|
|
return result;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Among CY7C68300 chips, the A revision does not support Cypress ATACB
|
||
|
|
* Filter out this revision from EEPROM default descriptor values
|
||
|
|
*/
|
||
|
|
device = interface_to_usbdev(intf);
|
||
|
|
if (device->descriptor.iManufacturer != 0x38 ||
|
||
|
|
device->descriptor.iProduct != 0x4e ||
|
||
|
|
device->descriptor.iSerialNumber != 0x64) {
|
||
|
|
us->protocol_name = "Transparent SCSI with Cypress ATACB";
|
||
|
|
us->proto_handler = cypress_atacb_passthrough;
|
||
|
|
} else {
|
||
|
|
us->protocol_name = "Transparent SCSI";
|
||
|
|
us->proto_handler = usb_stor_transparent_scsi_command;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = usb_stor_probe2(us);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct usb_driver cypress_driver = {
|
||
|
|
.name = DRV_NAME,
|
||
|
|
.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_stor_driver(cypress_driver, cypress_host_template, DRV_NAME);
|