/* * 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" #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"); /* * 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 = 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 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);