1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Support for emulating SAT (ata pass through) on devices based 4 * on the Cypress USB/ATA bridge supporting ATACB. 5 * 6 * Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr) 7 */ 8 9 #include <linux/module.h> 10 #include <scsi/scsi.h> 11 #include <scsi/scsi_cmnd.h> 12 #include <scsi/scsi_eh.h> 13 #include <linux/ata.h> 14 15 #include "usb.h" 16 #include "protocol.h" 17 #include "scsiglue.h" 18 #include "debug.h" 19 20 #define DRV_NAME "ums-cypress" 21 22 MODULE_DESCRIPTION("SAT support for Cypress USB/ATA bridges with ATACB"); 23 MODULE_AUTHOR("Matthieu Castet <castet.matthieu@free.fr>"); 24 MODULE_LICENSE("GPL"); 25 26 /* 27 * The table of devices 28 */ 29 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 30 vendorName, productName, useProtocol, useTransport, \ 31 initFunction, flags) \ 32 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 33 .driver_info = (flags) } 34 35 static struct usb_device_id cypress_usb_ids[] = { 36 # include "unusual_cypress.h" 37 { } /* Terminating entry */ 38 }; 39 MODULE_DEVICE_TABLE(usb, cypress_usb_ids); 40 41 #undef UNUSUAL_DEV 42 43 /* 44 * The flags table 45 */ 46 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ 47 vendor_name, product_name, use_protocol, use_transport, \ 48 init_function, Flags) \ 49 { \ 50 .vendorName = vendor_name, \ 51 .productName = product_name, \ 52 .useProtocol = use_protocol, \ 53 .useTransport = use_transport, \ 54 .initFunction = init_function, \ 55 } 56 57 static struct us_unusual_dev cypress_unusual_dev_list[] = { 58 # include "unusual_cypress.h" 59 { } /* Terminating entry */ 60 }; 61 62 #undef UNUSUAL_DEV 63 64 65 /* 66 * ATACB is a protocol used on cypress usb<->ata bridge to 67 * send raw ATA command over mass storage 68 * There is a ATACB2 protocol that support LBA48 on newer chip. 69 * More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf 70 * datasheet from cypress.com. 71 */ 72 static void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us) 73 { 74 unsigned char save_cmnd[MAX_COMMAND_SIZE]; 75 76 if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) { 77 usb_stor_transparent_scsi_command(srb, us); 78 return; 79 } 80 81 memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd)); 82 memset(srb->cmnd, 0, MAX_COMMAND_SIZE); 83 84 /* check if we support the command */ 85 if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */ 86 goto invalid_fld; 87 /* check protocol */ 88 switch ((save_cmnd[1] >> 1) & 0xf) { 89 case 3: /*no DATA */ 90 case 4: /* PIO in */ 91 case 5: /* PIO out */ 92 break; 93 default: 94 goto invalid_fld; 95 } 96 97 /* first build the ATACB command */ 98 srb->cmd_len = 16; 99 100 srb->cmnd[0] = 0x24; /* 101 * bVSCBSignature : vendor-specific command 102 * this value can change, but most(all ?) manufacturers 103 * keep the cypress default : 0x24 104 */ 105 srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */ 106 107 srb->cmnd[3] = 0xff - 1; /* 108 * features, sector count, lba low, lba med 109 * lba high, device, command are valid 110 */ 111 srb->cmnd[4] = 1; /* TransferBlockCount : 512 */ 112 113 if (save_cmnd[0] == ATA_16) { 114 srb->cmnd[ 6] = save_cmnd[ 4]; /* features */ 115 srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */ 116 srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */ 117 srb->cmnd[ 9] = save_cmnd[10]; /* lba med */ 118 srb->cmnd[10] = save_cmnd[12]; /* lba high */ 119 srb->cmnd[11] = save_cmnd[13]; /* device */ 120 srb->cmnd[12] = save_cmnd[14]; /* command */ 121 122 if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */ 123 /* this could be supported by atacb2 */ 124 if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9] 125 || save_cmnd[11]) 126 goto invalid_fld; 127 } 128 } else { /* ATA12 */ 129 srb->cmnd[ 6] = save_cmnd[3]; /* features */ 130 srb->cmnd[ 7] = save_cmnd[4]; /* sector count */ 131 srb->cmnd[ 8] = save_cmnd[5]; /* lba low */ 132 srb->cmnd[ 9] = save_cmnd[6]; /* lba med */ 133 srb->cmnd[10] = save_cmnd[7]; /* lba high */ 134 srb->cmnd[11] = save_cmnd[8]; /* device */ 135 srb->cmnd[12] = save_cmnd[9]; /* command */ 136 137 } 138 /* Filter SET_FEATURES - XFER MODE command */ 139 if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES) 140 && (srb->cmnd[6] == SETFEATURES_XFER)) 141 goto invalid_fld; 142 143 if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI) 144 srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */ 145 146 147 usb_stor_transparent_scsi_command(srb, us); 148 149 /* if the device doesn't support ATACB */ 150 if (srb->result == SAM_STAT_CHECK_CONDITION && 151 memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB, 152 sizeof(usb_stor_sense_invalidCDB)) == 0) { 153 usb_stor_dbg(us, "cypress atacb not supported ???\n"); 154 goto end; 155 } 156 157 /* 158 * if ck_cond flags is set, and there wasn't critical error, 159 * build the special sense 160 */ 161 if ((srb->result != (DID_ERROR << 16) && 162 srb->result != (DID_ABORT << 16)) && 163 save_cmnd[2] & 0x20) { 164 struct scsi_eh_save ses; 165 unsigned char regs[8]; 166 unsigned char *sb = srb->sense_buffer; 167 unsigned char *desc = sb + 8; 168 int tmp_result; 169 170 /* build the command for reading the ATA registers */ 171 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sizeof(regs)); 172 173 /* 174 * we use the same command as before, but we set 175 * the read taskfile bit, for not executing atacb command, 176 * but reading register selected in srb->cmnd[4] 177 */ 178 srb->cmd_len = 16; 179 srb->cmnd = ses.cmnd; 180 srb->cmnd[2] = 1; 181 182 usb_stor_transparent_scsi_command(srb, us); 183 memcpy(regs, srb->sense_buffer, sizeof(regs)); 184 tmp_result = srb->result; 185 scsi_eh_restore_cmnd(srb, &ses); 186 /* we fail to get registers, report invalid command */ 187 if (tmp_result != SAM_STAT_GOOD) 188 goto invalid_fld; 189 190 /* build the sense */ 191 memset(sb, 0, SCSI_SENSE_BUFFERSIZE); 192 193 /* set sk, asc for a good command */ 194 sb[1] = RECOVERED_ERROR; 195 sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */ 196 sb[3] = 0x1D; 197 198 /* 199 * XXX we should generate sk, asc, ascq from status and error 200 * regs 201 * (see 11.1 Error translation ATA device error to SCSI error 202 * map, and ata_to_sense_error from libata.) 203 */ 204 205 /* Sense data is current and format is descriptor. */ 206 sb[0] = 0x72; 207 desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */ 208 209 /* set length of additional sense data */ 210 sb[7] = 14; 211 desc[1] = 12; 212 213 /* Copy registers into sense buffer. */ 214 desc[ 2] = 0x00; 215 desc[ 3] = regs[1]; /* features */ 216 desc[ 5] = regs[2]; /* sector count */ 217 desc[ 7] = regs[3]; /* lba low */ 218 desc[ 9] = regs[4]; /* lba med */ 219 desc[11] = regs[5]; /* lba high */ 220 desc[12] = regs[6]; /* device */ 221 desc[13] = regs[7]; /* command */ 222 223 srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 224 } 225 goto end; 226 invalid_fld: 227 srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; 228 229 memcpy(srb->sense_buffer, 230 usb_stor_sense_invalidCDB, 231 sizeof(usb_stor_sense_invalidCDB)); 232 end: 233 memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd)); 234 if (srb->cmnd[0] == ATA_12) 235 srb->cmd_len = 12; 236 } 237 238 static struct scsi_host_template cypress_host_template; 239 240 static int cypress_probe(struct usb_interface *intf, 241 const struct usb_device_id *id) 242 { 243 struct us_data *us; 244 int result; 245 struct usb_device *device; 246 247 result = usb_stor_probe1(&us, intf, id, 248 (id - cypress_usb_ids) + cypress_unusual_dev_list, 249 &cypress_host_template); 250 if (result) 251 return result; 252 253 /* 254 * Among CY7C68300 chips, the A revision does not support Cypress ATACB 255 * Filter out this revision from EEPROM default descriptor values 256 */ 257 device = interface_to_usbdev(intf); 258 if (device->descriptor.iManufacturer != 0x38 || 259 device->descriptor.iProduct != 0x4e || 260 device->descriptor.iSerialNumber != 0x64) { 261 us->protocol_name = "Transparent SCSI with Cypress ATACB"; 262 us->proto_handler = cypress_atacb_passthrough; 263 } else { 264 us->protocol_name = "Transparent SCSI"; 265 us->proto_handler = usb_stor_transparent_scsi_command; 266 } 267 268 result = usb_stor_probe2(us); 269 return result; 270 } 271 272 static struct usb_driver cypress_driver = { 273 .name = DRV_NAME, 274 .probe = cypress_probe, 275 .disconnect = usb_stor_disconnect, 276 .suspend = usb_stor_suspend, 277 .resume = usb_stor_resume, 278 .reset_resume = usb_stor_reset_resume, 279 .pre_reset = usb_stor_pre_reset, 280 .post_reset = usb_stor_post_reset, 281 .id_table = cypress_usb_ids, 282 .soft_unbind = 1, 283 .no_dynamic_id = 1, 284 }; 285 286 module_usb_stor_driver(cypress_driver, cypress_host_template, DRV_NAME); 287