1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for Alauda-based card readers 4 * 5 * Current development and maintenance by: 6 * (c) 2005 Daniel Drake <dsd@gentoo.org> 7 * 8 * The 'Alauda' is a chip manufacturered by RATOC for OEM use. 9 * 10 * Alauda implements a vendor-specific command set to access two media reader 11 * ports (XD, SmartMedia). This driver converts SCSI commands to the commands 12 * which are accepted by these devices. 13 * 14 * The driver was developed through reverse-engineering, with the help of the 15 * sddr09 driver which has many similarities, and with some help from the 16 * (very old) vendor-supplied GPL sma03 driver. 17 * 18 * For protocol info, see http://alauda.sourceforge.net 19 */ 20 21 #include <linux/module.h> 22 #include <linux/slab.h> 23 24 #include <scsi/scsi.h> 25 #include <scsi/scsi_cmnd.h> 26 #include <scsi/scsi_device.h> 27 28 #include "usb.h" 29 #include "transport.h" 30 #include "protocol.h" 31 #include "debug.h" 32 #include "scsiglue.h" 33 34 #define DRV_NAME "ums-alauda" 35 36 MODULE_DESCRIPTION("Driver for Alauda-based card readers"); 37 MODULE_AUTHOR("Daniel Drake <dsd@gentoo.org>"); 38 MODULE_LICENSE("GPL"); 39 MODULE_IMPORT_NS(USB_STORAGE); 40 41 /* 42 * Status bytes 43 */ 44 #define ALAUDA_STATUS_ERROR 0x01 45 #define ALAUDA_STATUS_READY 0x40 46 47 /* 48 * Control opcodes (for request field) 49 */ 50 #define ALAUDA_GET_XD_MEDIA_STATUS 0x08 51 #define ALAUDA_GET_SM_MEDIA_STATUS 0x98 52 #define ALAUDA_ACK_XD_MEDIA_CHANGE 0x0a 53 #define ALAUDA_ACK_SM_MEDIA_CHANGE 0x9a 54 #define ALAUDA_GET_XD_MEDIA_SIG 0x86 55 #define ALAUDA_GET_SM_MEDIA_SIG 0x96 56 57 /* 58 * Bulk command identity (byte 0) 59 */ 60 #define ALAUDA_BULK_CMD 0x40 61 62 /* 63 * Bulk opcodes (byte 1) 64 */ 65 #define ALAUDA_BULK_GET_REDU_DATA 0x85 66 #define ALAUDA_BULK_READ_BLOCK 0x94 67 #define ALAUDA_BULK_ERASE_BLOCK 0xa3 68 #define ALAUDA_BULK_WRITE_BLOCK 0xb4 69 #define ALAUDA_BULK_GET_STATUS2 0xb7 70 #define ALAUDA_BULK_RESET_MEDIA 0xe0 71 72 /* 73 * Port to operate on (byte 8) 74 */ 75 #define ALAUDA_PORT_XD 0x00 76 #define ALAUDA_PORT_SM 0x01 77 78 /* 79 * LBA and PBA are unsigned ints. Special values. 80 */ 81 #define UNDEF 0xffff 82 #define SPARE 0xfffe 83 #define UNUSABLE 0xfffd 84 85 struct alauda_media_info { 86 unsigned long capacity; /* total media size in bytes */ 87 unsigned int pagesize; /* page size in bytes */ 88 unsigned int blocksize; /* number of pages per block */ 89 unsigned int uzonesize; /* number of usable blocks per zone */ 90 unsigned int zonesize; /* number of blocks per zone */ 91 unsigned int blockmask; /* mask to get page from address */ 92 93 unsigned char pageshift; 94 unsigned char blockshift; 95 unsigned char zoneshift; 96 97 u16 **lba_to_pba; /* logical to physical block map */ 98 u16 **pba_to_lba; /* physical to logical block map */ 99 }; 100 101 struct alauda_info { 102 struct alauda_media_info port[2]; 103 int wr_ep; /* endpoint to write data out of */ 104 105 unsigned char sense_key; 106 unsigned long sense_asc; /* additional sense code */ 107 unsigned long sense_ascq; /* additional sense code qualifier */ 108 }; 109 110 #define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) ) 111 #define LSB_of(s) ((s)&0xFF) 112 #define MSB_of(s) ((s)>>8) 113 114 #define MEDIA_PORT(us) us->srb->device->lun 115 #define MEDIA_INFO(us) ((struct alauda_info *)us->extra)->port[MEDIA_PORT(us)] 116 117 #define PBA_LO(pba) ((pba & 0xF) << 5) 118 #define PBA_HI(pba) (pba >> 3) 119 #define PBA_ZONE(pba) (pba >> 11) 120 121 static int init_alauda(struct us_data *us); 122 123 124 /* 125 * The table of devices 126 */ 127 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 128 vendorName, productName, useProtocol, useTransport, \ 129 initFunction, flags) \ 130 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 131 .driver_info = (flags) } 132 133 static struct usb_device_id alauda_usb_ids[] = { 134 # include "unusual_alauda.h" 135 { } /* Terminating entry */ 136 }; 137 MODULE_DEVICE_TABLE(usb, alauda_usb_ids); 138 139 #undef UNUSUAL_DEV 140 141 /* 142 * The flags table 143 */ 144 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \ 145 vendor_name, product_name, use_protocol, use_transport, \ 146 init_function, Flags) \ 147 { \ 148 .vendorName = vendor_name, \ 149 .productName = product_name, \ 150 .useProtocol = use_protocol, \ 151 .useTransport = use_transport, \ 152 .initFunction = init_function, \ 153 } 154 155 static struct us_unusual_dev alauda_unusual_dev_list[] = { 156 # include "unusual_alauda.h" 157 { } /* Terminating entry */ 158 }; 159 160 #undef UNUSUAL_DEV 161 162 163 /* 164 * Media handling 165 */ 166 167 struct alauda_card_info { 168 unsigned char id; /* id byte */ 169 unsigned char chipshift; /* 1<<cs bytes total capacity */ 170 unsigned char pageshift; /* 1<<ps bytes in a page */ 171 unsigned char blockshift; /* 1<<bs pages per block */ 172 unsigned char zoneshift; /* 1<<zs blocks per zone */ 173 }; 174 175 static struct alauda_card_info alauda_card_ids[] = { 176 /* NAND flash */ 177 { 0x6e, 20, 8, 4, 8}, /* 1 MB */ 178 { 0xe8, 20, 8, 4, 8}, /* 1 MB */ 179 { 0xec, 20, 8, 4, 8}, /* 1 MB */ 180 { 0x64, 21, 8, 4, 9}, /* 2 MB */ 181 { 0xea, 21, 8, 4, 9}, /* 2 MB */ 182 { 0x6b, 22, 9, 4, 9}, /* 4 MB */ 183 { 0xe3, 22, 9, 4, 9}, /* 4 MB */ 184 { 0xe5, 22, 9, 4, 9}, /* 4 MB */ 185 { 0xe6, 23, 9, 4, 10}, /* 8 MB */ 186 { 0x73, 24, 9, 5, 10}, /* 16 MB */ 187 { 0x75, 25, 9, 5, 10}, /* 32 MB */ 188 { 0x76, 26, 9, 5, 10}, /* 64 MB */ 189 { 0x79, 27, 9, 5, 10}, /* 128 MB */ 190 { 0x71, 28, 9, 5, 10}, /* 256 MB */ 191 192 /* MASK ROM */ 193 { 0x5d, 21, 9, 4, 8}, /* 2 MB */ 194 { 0xd5, 22, 9, 4, 9}, /* 4 MB */ 195 { 0xd6, 23, 9, 4, 10}, /* 8 MB */ 196 { 0x57, 24, 9, 4, 11}, /* 16 MB */ 197 { 0x58, 25, 9, 4, 12}, /* 32 MB */ 198 { 0,} 199 }; 200 201 static struct alauda_card_info *alauda_card_find_id(unsigned char id) 202 { 203 int i; 204 205 for (i = 0; alauda_card_ids[i].id != 0; i++) 206 if (alauda_card_ids[i].id == id) 207 return &(alauda_card_ids[i]); 208 return NULL; 209 } 210 211 /* 212 * ECC computation. 213 */ 214 215 static unsigned char parity[256]; 216 static unsigned char ecc2[256]; 217 218 static void nand_init_ecc(void) 219 { 220 int i, j, a; 221 222 parity[0] = 0; 223 for (i = 1; i < 256; i++) 224 parity[i] = (parity[i&(i-1)] ^ 1); 225 226 for (i = 0; i < 256; i++) { 227 a = 0; 228 for (j = 0; j < 8; j++) { 229 if (i & (1<<j)) { 230 if ((j & 1) == 0) 231 a ^= 0x04; 232 if ((j & 2) == 0) 233 a ^= 0x10; 234 if ((j & 4) == 0) 235 a ^= 0x40; 236 } 237 } 238 ecc2[i] = ~(a ^ (a<<1) ^ (parity[i] ? 0xa8 : 0)); 239 } 240 } 241 242 /* compute 3-byte ecc on 256 bytes */ 243 static void nand_compute_ecc(unsigned char *data, unsigned char *ecc) 244 { 245 int i, j, a; 246 unsigned char par = 0, bit, bits[8] = {0}; 247 248 /* collect 16 checksum bits */ 249 for (i = 0; i < 256; i++) { 250 par ^= data[i]; 251 bit = parity[data[i]]; 252 for (j = 0; j < 8; j++) 253 if ((i & (1<<j)) == 0) 254 bits[j] ^= bit; 255 } 256 257 /* put 4+4+4 = 12 bits in the ecc */ 258 a = (bits[3] << 6) + (bits[2] << 4) + (bits[1] << 2) + bits[0]; 259 ecc[0] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0)); 260 261 a = (bits[7] << 6) + (bits[6] << 4) + (bits[5] << 2) + bits[4]; 262 ecc[1] = ~(a ^ (a<<1) ^ (parity[par] ? 0xaa : 0)); 263 264 ecc[2] = ecc2[par]; 265 } 266 267 static int nand_compare_ecc(unsigned char *data, unsigned char *ecc) 268 { 269 return (data[0] == ecc[0] && data[1] == ecc[1] && data[2] == ecc[2]); 270 } 271 272 static void nand_store_ecc(unsigned char *data, unsigned char *ecc) 273 { 274 memcpy(data, ecc, 3); 275 } 276 277 /* 278 * Alauda driver 279 */ 280 281 /* 282 * Forget our PBA <---> LBA mappings for a particular port 283 */ 284 static void alauda_free_maps (struct alauda_media_info *media_info) 285 { 286 unsigned int shift = media_info->zoneshift 287 + media_info->blockshift + media_info->pageshift; 288 unsigned int num_zones = media_info->capacity >> shift; 289 unsigned int i; 290 291 if (media_info->lba_to_pba != NULL) 292 for (i = 0; i < num_zones; i++) { 293 kfree(media_info->lba_to_pba[i]); 294 media_info->lba_to_pba[i] = NULL; 295 } 296 297 if (media_info->pba_to_lba != NULL) 298 for (i = 0; i < num_zones; i++) { 299 kfree(media_info->pba_to_lba[i]); 300 media_info->pba_to_lba[i] = NULL; 301 } 302 } 303 304 /* 305 * Returns 2 bytes of status data 306 * The first byte describes media status, and second byte describes door status 307 */ 308 static int alauda_get_media_status(struct us_data *us, unsigned char *data) 309 { 310 int rc; 311 unsigned char command; 312 313 if (MEDIA_PORT(us) == ALAUDA_PORT_XD) 314 command = ALAUDA_GET_XD_MEDIA_STATUS; 315 else 316 command = ALAUDA_GET_SM_MEDIA_STATUS; 317 318 rc = usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe, 319 command, 0xc0, 0, 1, data, 2); 320 321 usb_stor_dbg(us, "Media status %02X %02X\n", data[0], data[1]); 322 323 return rc; 324 } 325 326 /* 327 * Clears the "media was changed" bit so that we know when it changes again 328 * in the future. 329 */ 330 static int alauda_ack_media(struct us_data *us) 331 { 332 unsigned char command; 333 334 if (MEDIA_PORT(us) == ALAUDA_PORT_XD) 335 command = ALAUDA_ACK_XD_MEDIA_CHANGE; 336 else 337 command = ALAUDA_ACK_SM_MEDIA_CHANGE; 338 339 return usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, 340 command, 0x40, 0, 1, NULL, 0); 341 } 342 343 /* 344 * Retrieves a 4-byte media signature, which indicates manufacturer, capacity, 345 * and some other details. 346 */ 347 static int alauda_get_media_signature(struct us_data *us, unsigned char *data) 348 { 349 unsigned char command; 350 351 if (MEDIA_PORT(us) == ALAUDA_PORT_XD) 352 command = ALAUDA_GET_XD_MEDIA_SIG; 353 else 354 command = ALAUDA_GET_SM_MEDIA_SIG; 355 356 return usb_stor_ctrl_transfer(us, us->recv_ctrl_pipe, 357 command, 0xc0, 0, 0, data, 4); 358 } 359 360 /* 361 * Resets the media status (but not the whole device?) 362 */ 363 static int alauda_reset_media(struct us_data *us) 364 { 365 unsigned char *command = us->iobuf; 366 367 memset(command, 0, 9); 368 command[0] = ALAUDA_BULK_CMD; 369 command[1] = ALAUDA_BULK_RESET_MEDIA; 370 command[8] = MEDIA_PORT(us); 371 372 return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 373 command, 9, NULL); 374 } 375 376 /* 377 * Examines the media and deduces capacity, etc. 378 */ 379 static int alauda_init_media(struct us_data *us) 380 { 381 unsigned char *data = us->iobuf; 382 int ready = 0; 383 struct alauda_card_info *media_info; 384 unsigned int num_zones; 385 386 while (ready == 0) { 387 msleep(20); 388 389 if (alauda_get_media_status(us, data) != USB_STOR_XFER_GOOD) 390 return USB_STOR_TRANSPORT_ERROR; 391 392 if (data[0] & 0x10) 393 ready = 1; 394 } 395 396 usb_stor_dbg(us, "We are ready for action!\n"); 397 398 if (alauda_ack_media(us) != USB_STOR_XFER_GOOD) 399 return USB_STOR_TRANSPORT_ERROR; 400 401 msleep(10); 402 403 if (alauda_get_media_status(us, data) != USB_STOR_XFER_GOOD) 404 return USB_STOR_TRANSPORT_ERROR; 405 406 if (data[0] != 0x14) { 407 usb_stor_dbg(us, "Media not ready after ack\n"); 408 return USB_STOR_TRANSPORT_ERROR; 409 } 410 411 if (alauda_get_media_signature(us, data) != USB_STOR_XFER_GOOD) 412 return USB_STOR_TRANSPORT_ERROR; 413 414 usb_stor_dbg(us, "Media signature: %4ph\n", data); 415 media_info = alauda_card_find_id(data[1]); 416 if (media_info == NULL) { 417 pr_warn("alauda_init_media: Unrecognised media signature: %4ph\n", 418 data); 419 return USB_STOR_TRANSPORT_ERROR; 420 } 421 422 MEDIA_INFO(us).capacity = 1 << media_info->chipshift; 423 usb_stor_dbg(us, "Found media with capacity: %ldMB\n", 424 MEDIA_INFO(us).capacity >> 20); 425 426 MEDIA_INFO(us).pageshift = media_info->pageshift; 427 MEDIA_INFO(us).blockshift = media_info->blockshift; 428 MEDIA_INFO(us).zoneshift = media_info->zoneshift; 429 430 MEDIA_INFO(us).pagesize = 1 << media_info->pageshift; 431 MEDIA_INFO(us).blocksize = 1 << media_info->blockshift; 432 MEDIA_INFO(us).zonesize = 1 << media_info->zoneshift; 433 434 MEDIA_INFO(us).uzonesize = ((1 << media_info->zoneshift) / 128) * 125; 435 MEDIA_INFO(us).blockmask = MEDIA_INFO(us).blocksize - 1; 436 437 num_zones = MEDIA_INFO(us).capacity >> (MEDIA_INFO(us).zoneshift 438 + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift); 439 MEDIA_INFO(us).pba_to_lba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO); 440 MEDIA_INFO(us).lba_to_pba = kcalloc(num_zones, sizeof(u16*), GFP_NOIO); 441 442 if (alauda_reset_media(us) != USB_STOR_XFER_GOOD) 443 return USB_STOR_TRANSPORT_ERROR; 444 445 return USB_STOR_TRANSPORT_GOOD; 446 } 447 448 /* 449 * Examines the media status and does the right thing when the media has gone, 450 * appeared, or changed. 451 */ 452 static int alauda_check_media(struct us_data *us) 453 { 454 struct alauda_info *info = (struct alauda_info *) us->extra; 455 unsigned char status[2]; 456 int rc; 457 458 rc = alauda_get_media_status(us, status); 459 460 /* Check for no media or door open */ 461 if ((status[0] & 0x80) || ((status[0] & 0x1F) == 0x10) 462 || ((status[1] & 0x01) == 0)) { 463 usb_stor_dbg(us, "No media, or door open\n"); 464 alauda_free_maps(&MEDIA_INFO(us)); 465 info->sense_key = 0x02; 466 info->sense_asc = 0x3A; 467 info->sense_ascq = 0x00; 468 return USB_STOR_TRANSPORT_FAILED; 469 } 470 471 /* Check for media change */ 472 if (status[0] & 0x08) { 473 usb_stor_dbg(us, "Media change detected\n"); 474 alauda_free_maps(&MEDIA_INFO(us)); 475 alauda_init_media(us); 476 477 info->sense_key = UNIT_ATTENTION; 478 info->sense_asc = 0x28; 479 info->sense_ascq = 0x00; 480 return USB_STOR_TRANSPORT_FAILED; 481 } 482 483 return USB_STOR_TRANSPORT_GOOD; 484 } 485 486 /* 487 * Checks the status from the 2nd status register 488 * Returns 3 bytes of status data, only the first is known 489 */ 490 static int alauda_check_status2(struct us_data *us) 491 { 492 int rc; 493 unsigned char command[] = { 494 ALAUDA_BULK_CMD, ALAUDA_BULK_GET_STATUS2, 495 0, 0, 0, 0, 3, 0, MEDIA_PORT(us) 496 }; 497 unsigned char data[3]; 498 499 rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 500 command, 9, NULL); 501 if (rc != USB_STOR_XFER_GOOD) 502 return rc; 503 504 rc = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 505 data, 3, NULL); 506 if (rc != USB_STOR_XFER_GOOD) 507 return rc; 508 509 usb_stor_dbg(us, "%3ph\n", data); 510 if (data[0] & ALAUDA_STATUS_ERROR) 511 return USB_STOR_XFER_ERROR; 512 513 return USB_STOR_XFER_GOOD; 514 } 515 516 /* 517 * Gets the redundancy data for the first page of a PBA 518 * Returns 16 bytes. 519 */ 520 static int alauda_get_redu_data(struct us_data *us, u16 pba, unsigned char *data) 521 { 522 int rc; 523 unsigned char command[] = { 524 ALAUDA_BULK_CMD, ALAUDA_BULK_GET_REDU_DATA, 525 PBA_HI(pba), PBA_ZONE(pba), 0, PBA_LO(pba), 0, 0, MEDIA_PORT(us) 526 }; 527 528 rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 529 command, 9, NULL); 530 if (rc != USB_STOR_XFER_GOOD) 531 return rc; 532 533 return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 534 data, 16, NULL); 535 } 536 537 /* 538 * Finds the first unused PBA in a zone 539 * Returns the absolute PBA of an unused PBA, or 0 if none found. 540 */ 541 static u16 alauda_find_unused_pba(struct alauda_media_info *info, 542 unsigned int zone) 543 { 544 u16 *pba_to_lba = info->pba_to_lba[zone]; 545 unsigned int i; 546 547 for (i = 0; i < info->zonesize; i++) 548 if (pba_to_lba[i] == UNDEF) 549 return (zone << info->zoneshift) + i; 550 551 return 0; 552 } 553 554 /* 555 * Reads the redundancy data for all PBA's in a zone 556 * Produces lba <--> pba mappings 557 */ 558 static int alauda_read_map(struct us_data *us, unsigned int zone) 559 { 560 unsigned char *data = us->iobuf; 561 int result; 562 int i, j; 563 unsigned int zonesize = MEDIA_INFO(us).zonesize; 564 unsigned int uzonesize = MEDIA_INFO(us).uzonesize; 565 unsigned int lba_offset, lba_real, blocknum; 566 unsigned int zone_base_lba = zone * uzonesize; 567 unsigned int zone_base_pba = zone * zonesize; 568 u16 *lba_to_pba = kcalloc(zonesize, sizeof(u16), GFP_NOIO); 569 u16 *pba_to_lba = kcalloc(zonesize, sizeof(u16), GFP_NOIO); 570 if (lba_to_pba == NULL || pba_to_lba == NULL) { 571 result = USB_STOR_TRANSPORT_ERROR; 572 goto error; 573 } 574 575 usb_stor_dbg(us, "Mapping blocks for zone %d\n", zone); 576 577 /* 1024 PBA's per zone */ 578 for (i = 0; i < zonesize; i++) 579 lba_to_pba[i] = pba_to_lba[i] = UNDEF; 580 581 for (i = 0; i < zonesize; i++) { 582 blocknum = zone_base_pba + i; 583 584 result = alauda_get_redu_data(us, blocknum, data); 585 if (result != USB_STOR_XFER_GOOD) { 586 result = USB_STOR_TRANSPORT_ERROR; 587 goto error; 588 } 589 590 /* special PBAs have control field 0^16 */ 591 for (j = 0; j < 16; j++) 592 if (data[j] != 0) 593 goto nonz; 594 pba_to_lba[i] = UNUSABLE; 595 usb_stor_dbg(us, "PBA %d has no logical mapping\n", blocknum); 596 continue; 597 598 nonz: 599 /* unwritten PBAs have control field FF^16 */ 600 for (j = 0; j < 16; j++) 601 if (data[j] != 0xff) 602 goto nonff; 603 continue; 604 605 nonff: 606 /* normal PBAs start with six FFs */ 607 if (j < 6) { 608 usb_stor_dbg(us, "PBA %d has no logical mapping: reserved area = %02X%02X%02X%02X data status %02X block status %02X\n", 609 blocknum, 610 data[0], data[1], data[2], data[3], 611 data[4], data[5]); 612 pba_to_lba[i] = UNUSABLE; 613 continue; 614 } 615 616 if ((data[6] >> 4) != 0x01) { 617 usb_stor_dbg(us, "PBA %d has invalid address field %02X%02X/%02X%02X\n", 618 blocknum, data[6], data[7], 619 data[11], data[12]); 620 pba_to_lba[i] = UNUSABLE; 621 continue; 622 } 623 624 /* check even parity */ 625 if (parity[data[6] ^ data[7]]) { 626 printk(KERN_WARNING 627 "alauda_read_map: Bad parity in LBA for block %d" 628 " (%02X %02X)\n", i, data[6], data[7]); 629 pba_to_lba[i] = UNUSABLE; 630 continue; 631 } 632 633 lba_offset = short_pack(data[7], data[6]); 634 lba_offset = (lba_offset & 0x07FF) >> 1; 635 lba_real = lba_offset + zone_base_lba; 636 637 /* 638 * Every 1024 physical blocks ("zone"), the LBA numbers 639 * go back to zero, but are within a higher block of LBA's. 640 * Also, there is a maximum of 1000 LBA's per zone. 641 * In other words, in PBA 1024-2047 you will find LBA 0-999 642 * which are really LBA 1000-1999. This allows for 24 bad 643 * or special physical blocks per zone. 644 */ 645 646 if (lba_offset >= uzonesize) { 647 printk(KERN_WARNING 648 "alauda_read_map: Bad low LBA %d for block %d\n", 649 lba_real, blocknum); 650 continue; 651 } 652 653 if (lba_to_pba[lba_offset] != UNDEF) { 654 printk(KERN_WARNING 655 "alauda_read_map: " 656 "LBA %d seen for PBA %d and %d\n", 657 lba_real, lba_to_pba[lba_offset], blocknum); 658 continue; 659 } 660 661 pba_to_lba[i] = lba_real; 662 lba_to_pba[lba_offset] = blocknum; 663 continue; 664 } 665 666 MEDIA_INFO(us).lba_to_pba[zone] = lba_to_pba; 667 MEDIA_INFO(us).pba_to_lba[zone] = pba_to_lba; 668 result = 0; 669 goto out; 670 671 error: 672 kfree(lba_to_pba); 673 kfree(pba_to_lba); 674 out: 675 return result; 676 } 677 678 /* 679 * Checks to see whether we have already mapped a certain zone 680 * If we haven't, the map is generated 681 */ 682 static void alauda_ensure_map_for_zone(struct us_data *us, unsigned int zone) 683 { 684 if (MEDIA_INFO(us).lba_to_pba[zone] == NULL 685 || MEDIA_INFO(us).pba_to_lba[zone] == NULL) 686 alauda_read_map(us, zone); 687 } 688 689 /* 690 * Erases an entire block 691 */ 692 static int alauda_erase_block(struct us_data *us, u16 pba) 693 { 694 int rc; 695 unsigned char command[] = { 696 ALAUDA_BULK_CMD, ALAUDA_BULK_ERASE_BLOCK, PBA_HI(pba), 697 PBA_ZONE(pba), 0, PBA_LO(pba), 0x02, 0, MEDIA_PORT(us) 698 }; 699 unsigned char buf[2]; 700 701 usb_stor_dbg(us, "Erasing PBA %d\n", pba); 702 703 rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 704 command, 9, NULL); 705 if (rc != USB_STOR_XFER_GOOD) 706 return rc; 707 708 rc = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 709 buf, 2, NULL); 710 if (rc != USB_STOR_XFER_GOOD) 711 return rc; 712 713 usb_stor_dbg(us, "Erase result: %02X %02X\n", buf[0], buf[1]); 714 return rc; 715 } 716 717 /* 718 * Reads data from a certain offset page inside a PBA, including interleaved 719 * redundancy data. Returns (pagesize+64)*pages bytes in data. 720 */ 721 static int alauda_read_block_raw(struct us_data *us, u16 pba, 722 unsigned int page, unsigned int pages, unsigned char *data) 723 { 724 int rc; 725 unsigned char command[] = { 726 ALAUDA_BULK_CMD, ALAUDA_BULK_READ_BLOCK, PBA_HI(pba), 727 PBA_ZONE(pba), 0, PBA_LO(pba) + page, pages, 0, MEDIA_PORT(us) 728 }; 729 730 usb_stor_dbg(us, "pba %d page %d count %d\n", pba, page, pages); 731 732 rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 733 command, 9, NULL); 734 if (rc != USB_STOR_XFER_GOOD) 735 return rc; 736 737 return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 738 data, (MEDIA_INFO(us).pagesize + 64) * pages, NULL); 739 } 740 741 /* 742 * Reads data from a certain offset page inside a PBA, excluding redundancy 743 * data. Returns pagesize*pages bytes in data. Note that data must be big enough 744 * to hold (pagesize+64)*pages bytes of data, but you can ignore those 'extra' 745 * trailing bytes outside this function. 746 */ 747 static int alauda_read_block(struct us_data *us, u16 pba, 748 unsigned int page, unsigned int pages, unsigned char *data) 749 { 750 int i, rc; 751 unsigned int pagesize = MEDIA_INFO(us).pagesize; 752 753 rc = alauda_read_block_raw(us, pba, page, pages, data); 754 if (rc != USB_STOR_XFER_GOOD) 755 return rc; 756 757 /* Cut out the redundancy data */ 758 for (i = 0; i < pages; i++) { 759 int dest_offset = i * pagesize; 760 int src_offset = i * (pagesize + 64); 761 memmove(data + dest_offset, data + src_offset, pagesize); 762 } 763 764 return rc; 765 } 766 767 /* 768 * Writes an entire block of data and checks status after write. 769 * Redundancy data must be already included in data. Data should be 770 * (pagesize+64)*blocksize bytes in length. 771 */ 772 static int alauda_write_block(struct us_data *us, u16 pba, unsigned char *data) 773 { 774 int rc; 775 struct alauda_info *info = (struct alauda_info *) us->extra; 776 unsigned char command[] = { 777 ALAUDA_BULK_CMD, ALAUDA_BULK_WRITE_BLOCK, PBA_HI(pba), 778 PBA_ZONE(pba), 0, PBA_LO(pba), 32, 0, MEDIA_PORT(us) 779 }; 780 781 usb_stor_dbg(us, "pba %d\n", pba); 782 783 rc = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 784 command, 9, NULL); 785 if (rc != USB_STOR_XFER_GOOD) 786 return rc; 787 788 rc = usb_stor_bulk_transfer_buf(us, info->wr_ep, data, 789 (MEDIA_INFO(us).pagesize + 64) * MEDIA_INFO(us).blocksize, 790 NULL); 791 if (rc != USB_STOR_XFER_GOOD) 792 return rc; 793 794 return alauda_check_status2(us); 795 } 796 797 /* 798 * Write some data to a specific LBA. 799 */ 800 static int alauda_write_lba(struct us_data *us, u16 lba, 801 unsigned int page, unsigned int pages, 802 unsigned char *ptr, unsigned char *blockbuffer) 803 { 804 u16 pba, lbap, new_pba; 805 unsigned char *bptr, *cptr, *xptr; 806 unsigned char ecc[3]; 807 int i, result; 808 unsigned int uzonesize = MEDIA_INFO(us).uzonesize; 809 unsigned int zonesize = MEDIA_INFO(us).zonesize; 810 unsigned int pagesize = MEDIA_INFO(us).pagesize; 811 unsigned int blocksize = MEDIA_INFO(us).blocksize; 812 unsigned int lba_offset = lba % uzonesize; 813 unsigned int new_pba_offset; 814 unsigned int zone = lba / uzonesize; 815 816 alauda_ensure_map_for_zone(us, zone); 817 818 pba = MEDIA_INFO(us).lba_to_pba[zone][lba_offset]; 819 if (pba == 1) { 820 /* 821 * Maybe it is impossible to write to PBA 1. 822 * Fake success, but don't do anything. 823 */ 824 printk(KERN_WARNING 825 "alauda_write_lba: avoid writing to pba 1\n"); 826 return USB_STOR_TRANSPORT_GOOD; 827 } 828 829 new_pba = alauda_find_unused_pba(&MEDIA_INFO(us), zone); 830 if (!new_pba) { 831 printk(KERN_WARNING 832 "alauda_write_lba: Out of unused blocks\n"); 833 return USB_STOR_TRANSPORT_ERROR; 834 } 835 836 /* read old contents */ 837 if (pba != UNDEF) { 838 result = alauda_read_block_raw(us, pba, 0, 839 blocksize, blockbuffer); 840 if (result != USB_STOR_XFER_GOOD) 841 return result; 842 } else { 843 memset(blockbuffer, 0, blocksize * (pagesize + 64)); 844 } 845 846 lbap = (lba_offset << 1) | 0x1000; 847 if (parity[MSB_of(lbap) ^ LSB_of(lbap)]) 848 lbap ^= 1; 849 850 /* check old contents and fill lba */ 851 for (i = 0; i < blocksize; i++) { 852 bptr = blockbuffer + (i * (pagesize + 64)); 853 cptr = bptr + pagesize; 854 nand_compute_ecc(bptr, ecc); 855 if (!nand_compare_ecc(cptr+13, ecc)) { 856 usb_stor_dbg(us, "Warning: bad ecc in page %d- of pba %d\n", 857 i, pba); 858 nand_store_ecc(cptr+13, ecc); 859 } 860 nand_compute_ecc(bptr + (pagesize / 2), ecc); 861 if (!nand_compare_ecc(cptr+8, ecc)) { 862 usb_stor_dbg(us, "Warning: bad ecc in page %d+ of pba %d\n", 863 i, pba); 864 nand_store_ecc(cptr+8, ecc); 865 } 866 cptr[6] = cptr[11] = MSB_of(lbap); 867 cptr[7] = cptr[12] = LSB_of(lbap); 868 } 869 870 /* copy in new stuff and compute ECC */ 871 xptr = ptr; 872 for (i = page; i < page+pages; i++) { 873 bptr = blockbuffer + (i * (pagesize + 64)); 874 cptr = bptr + pagesize; 875 memcpy(bptr, xptr, pagesize); 876 xptr += pagesize; 877 nand_compute_ecc(bptr, ecc); 878 nand_store_ecc(cptr+13, ecc); 879 nand_compute_ecc(bptr + (pagesize / 2), ecc); 880 nand_store_ecc(cptr+8, ecc); 881 } 882 883 result = alauda_write_block(us, new_pba, blockbuffer); 884 if (result != USB_STOR_XFER_GOOD) 885 return result; 886 887 new_pba_offset = new_pba - (zone * zonesize); 888 MEDIA_INFO(us).pba_to_lba[zone][new_pba_offset] = lba; 889 MEDIA_INFO(us).lba_to_pba[zone][lba_offset] = new_pba; 890 usb_stor_dbg(us, "Remapped LBA %d to PBA %d\n", lba, new_pba); 891 892 if (pba != UNDEF) { 893 unsigned int pba_offset = pba - (zone * zonesize); 894 result = alauda_erase_block(us, pba); 895 if (result != USB_STOR_XFER_GOOD) 896 return result; 897 MEDIA_INFO(us).pba_to_lba[zone][pba_offset] = UNDEF; 898 } 899 900 return USB_STOR_TRANSPORT_GOOD; 901 } 902 903 /* 904 * Read data from a specific sector address 905 */ 906 static int alauda_read_data(struct us_data *us, unsigned long address, 907 unsigned int sectors) 908 { 909 unsigned char *buffer; 910 u16 lba, max_lba; 911 unsigned int page, len, offset; 912 unsigned int blockshift = MEDIA_INFO(us).blockshift; 913 unsigned int pageshift = MEDIA_INFO(us).pageshift; 914 unsigned int blocksize = MEDIA_INFO(us).blocksize; 915 unsigned int pagesize = MEDIA_INFO(us).pagesize; 916 unsigned int uzonesize = MEDIA_INFO(us).uzonesize; 917 struct scatterlist *sg; 918 int result; 919 920 /* 921 * Since we only read in one block at a time, we have to create 922 * a bounce buffer and move the data a piece at a time between the 923 * bounce buffer and the actual transfer buffer. 924 * We make this buffer big enough to hold temporary redundancy data, 925 * which we use when reading the data blocks. 926 */ 927 928 len = min(sectors, blocksize) * (pagesize + 64); 929 buffer = kmalloc(len, GFP_NOIO); 930 if (!buffer) 931 return USB_STOR_TRANSPORT_ERROR; 932 933 /* Figure out the initial LBA and page */ 934 lba = address >> blockshift; 935 page = (address & MEDIA_INFO(us).blockmask); 936 max_lba = MEDIA_INFO(us).capacity >> (blockshift + pageshift); 937 938 result = USB_STOR_TRANSPORT_GOOD; 939 offset = 0; 940 sg = NULL; 941 942 while (sectors > 0) { 943 unsigned int zone = lba / uzonesize; /* integer division */ 944 unsigned int lba_offset = lba - (zone * uzonesize); 945 unsigned int pages; 946 u16 pba; 947 alauda_ensure_map_for_zone(us, zone); 948 949 /* Not overflowing capacity? */ 950 if (lba >= max_lba) { 951 usb_stor_dbg(us, "Error: Requested lba %u exceeds maximum %u\n", 952 lba, max_lba); 953 result = USB_STOR_TRANSPORT_ERROR; 954 break; 955 } 956 957 /* Find number of pages we can read in this block */ 958 pages = min(sectors, blocksize - page); 959 len = pages << pageshift; 960 961 /* Find where this lba lives on disk */ 962 pba = MEDIA_INFO(us).lba_to_pba[zone][lba_offset]; 963 964 if (pba == UNDEF) { /* this lba was never written */ 965 usb_stor_dbg(us, "Read %d zero pages (LBA %d) page %d\n", 966 pages, lba, page); 967 968 /* 969 * This is not really an error. It just means 970 * that the block has never been written. 971 * Instead of returning USB_STOR_TRANSPORT_ERROR 972 * it is better to return all zero data. 973 */ 974 975 memset(buffer, 0, len); 976 } else { 977 usb_stor_dbg(us, "Read %d pages, from PBA %d (LBA %d) page %d\n", 978 pages, pba, lba, page); 979 980 result = alauda_read_block(us, pba, page, pages, buffer); 981 if (result != USB_STOR_TRANSPORT_GOOD) 982 break; 983 } 984 985 /* Store the data in the transfer buffer */ 986 usb_stor_access_xfer_buf(buffer, len, us->srb, 987 &sg, &offset, TO_XFER_BUF); 988 989 page = 0; 990 lba++; 991 sectors -= pages; 992 } 993 994 kfree(buffer); 995 return result; 996 } 997 998 /* 999 * Write data to a specific sector address 1000 */ 1001 static int alauda_write_data(struct us_data *us, unsigned long address, 1002 unsigned int sectors) 1003 { 1004 unsigned char *buffer, *blockbuffer; 1005 unsigned int page, len, offset; 1006 unsigned int blockshift = MEDIA_INFO(us).blockshift; 1007 unsigned int pageshift = MEDIA_INFO(us).pageshift; 1008 unsigned int blocksize = MEDIA_INFO(us).blocksize; 1009 unsigned int pagesize = MEDIA_INFO(us).pagesize; 1010 struct scatterlist *sg; 1011 u16 lba, max_lba; 1012 int result; 1013 1014 /* 1015 * Since we don't write the user data directly to the device, 1016 * we have to create a bounce buffer and move the data a piece 1017 * at a time between the bounce buffer and the actual transfer buffer. 1018 */ 1019 1020 len = min(sectors, blocksize) * pagesize; 1021 buffer = kmalloc(len, GFP_NOIO); 1022 if (!buffer) 1023 return USB_STOR_TRANSPORT_ERROR; 1024 1025 /* 1026 * We also need a temporary block buffer, where we read in the old data, 1027 * overwrite parts with the new data, and manipulate the redundancy data 1028 */ 1029 blockbuffer = kmalloc_array(pagesize + 64, blocksize, GFP_NOIO); 1030 if (!blockbuffer) { 1031 kfree(buffer); 1032 return USB_STOR_TRANSPORT_ERROR; 1033 } 1034 1035 /* Figure out the initial LBA and page */ 1036 lba = address >> blockshift; 1037 page = (address & MEDIA_INFO(us).blockmask); 1038 max_lba = MEDIA_INFO(us).capacity >> (pageshift + blockshift); 1039 1040 result = USB_STOR_TRANSPORT_GOOD; 1041 offset = 0; 1042 sg = NULL; 1043 1044 while (sectors > 0) { 1045 /* Write as many sectors as possible in this block */ 1046 unsigned int pages = min(sectors, blocksize - page); 1047 len = pages << pageshift; 1048 1049 /* Not overflowing capacity? */ 1050 if (lba >= max_lba) { 1051 usb_stor_dbg(us, "Requested lba %u exceeds maximum %u\n", 1052 lba, max_lba); 1053 result = USB_STOR_TRANSPORT_ERROR; 1054 break; 1055 } 1056 1057 /* Get the data from the transfer buffer */ 1058 usb_stor_access_xfer_buf(buffer, len, us->srb, 1059 &sg, &offset, FROM_XFER_BUF); 1060 1061 result = alauda_write_lba(us, lba, page, pages, buffer, 1062 blockbuffer); 1063 if (result != USB_STOR_TRANSPORT_GOOD) 1064 break; 1065 1066 page = 0; 1067 lba++; 1068 sectors -= pages; 1069 } 1070 1071 kfree(buffer); 1072 kfree(blockbuffer); 1073 return result; 1074 } 1075 1076 /* 1077 * Our interface with the rest of the world 1078 */ 1079 1080 static void alauda_info_destructor(void *extra) 1081 { 1082 struct alauda_info *info = (struct alauda_info *) extra; 1083 int port; 1084 1085 if (!info) 1086 return; 1087 1088 for (port = 0; port < 2; port++) { 1089 struct alauda_media_info *media_info = &info->port[port]; 1090 1091 alauda_free_maps(media_info); 1092 kfree(media_info->lba_to_pba); 1093 kfree(media_info->pba_to_lba); 1094 } 1095 } 1096 1097 /* 1098 * Initialize alauda_info struct and find the data-write endpoint 1099 */ 1100 static int init_alauda(struct us_data *us) 1101 { 1102 struct alauda_info *info; 1103 struct usb_host_interface *altsetting = us->pusb_intf->cur_altsetting; 1104 nand_init_ecc(); 1105 1106 us->extra = kzalloc(sizeof(struct alauda_info), GFP_NOIO); 1107 if (!us->extra) 1108 return USB_STOR_TRANSPORT_ERROR; 1109 1110 info = (struct alauda_info *) us->extra; 1111 us->extra_destructor = alauda_info_destructor; 1112 1113 info->wr_ep = usb_sndbulkpipe(us->pusb_dev, 1114 altsetting->endpoint[0].desc.bEndpointAddress 1115 & USB_ENDPOINT_NUMBER_MASK); 1116 1117 return USB_STOR_TRANSPORT_GOOD; 1118 } 1119 1120 static int alauda_transport(struct scsi_cmnd *srb, struct us_data *us) 1121 { 1122 int rc; 1123 struct alauda_info *info = (struct alauda_info *) us->extra; 1124 unsigned char *ptr = us->iobuf; 1125 static unsigned char inquiry_response[36] = { 1126 0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00 1127 }; 1128 1129 if (srb->cmnd[0] == INQUIRY) { 1130 usb_stor_dbg(us, "INQUIRY - Returning bogus response\n"); 1131 memcpy(ptr, inquiry_response, sizeof(inquiry_response)); 1132 fill_inquiry_response(us, ptr, 36); 1133 return USB_STOR_TRANSPORT_GOOD; 1134 } 1135 1136 if (srb->cmnd[0] == TEST_UNIT_READY) { 1137 usb_stor_dbg(us, "TEST_UNIT_READY\n"); 1138 return alauda_check_media(us); 1139 } 1140 1141 if (srb->cmnd[0] == READ_CAPACITY) { 1142 unsigned int num_zones; 1143 unsigned long capacity; 1144 1145 rc = alauda_check_media(us); 1146 if (rc != USB_STOR_TRANSPORT_GOOD) 1147 return rc; 1148 1149 num_zones = MEDIA_INFO(us).capacity >> (MEDIA_INFO(us).zoneshift 1150 + MEDIA_INFO(us).blockshift + MEDIA_INFO(us).pageshift); 1151 1152 capacity = num_zones * MEDIA_INFO(us).uzonesize 1153 * MEDIA_INFO(us).blocksize; 1154 1155 /* Report capacity and page size */ 1156 ((__be32 *) ptr)[0] = cpu_to_be32(capacity - 1); 1157 ((__be32 *) ptr)[1] = cpu_to_be32(512); 1158 1159 usb_stor_set_xfer_buf(ptr, 8, srb); 1160 return USB_STOR_TRANSPORT_GOOD; 1161 } 1162 1163 if (srb->cmnd[0] == READ_10) { 1164 unsigned int page, pages; 1165 1166 rc = alauda_check_media(us); 1167 if (rc != USB_STOR_TRANSPORT_GOOD) 1168 return rc; 1169 1170 page = short_pack(srb->cmnd[3], srb->cmnd[2]); 1171 page <<= 16; 1172 page |= short_pack(srb->cmnd[5], srb->cmnd[4]); 1173 pages = short_pack(srb->cmnd[8], srb->cmnd[7]); 1174 1175 usb_stor_dbg(us, "READ_10: page %d pagect %d\n", page, pages); 1176 1177 return alauda_read_data(us, page, pages); 1178 } 1179 1180 if (srb->cmnd[0] == WRITE_10) { 1181 unsigned int page, pages; 1182 1183 rc = alauda_check_media(us); 1184 if (rc != USB_STOR_TRANSPORT_GOOD) 1185 return rc; 1186 1187 page = short_pack(srb->cmnd[3], srb->cmnd[2]); 1188 page <<= 16; 1189 page |= short_pack(srb->cmnd[5], srb->cmnd[4]); 1190 pages = short_pack(srb->cmnd[8], srb->cmnd[7]); 1191 1192 usb_stor_dbg(us, "WRITE_10: page %d pagect %d\n", page, pages); 1193 1194 return alauda_write_data(us, page, pages); 1195 } 1196 1197 if (srb->cmnd[0] == REQUEST_SENSE) { 1198 usb_stor_dbg(us, "REQUEST_SENSE\n"); 1199 1200 memset(ptr, 0, 18); 1201 ptr[0] = 0xF0; 1202 ptr[2] = info->sense_key; 1203 ptr[7] = 11; 1204 ptr[12] = info->sense_asc; 1205 ptr[13] = info->sense_ascq; 1206 usb_stor_set_xfer_buf(ptr, 18, srb); 1207 1208 return USB_STOR_TRANSPORT_GOOD; 1209 } 1210 1211 if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) { 1212 /* 1213 * sure. whatever. not like we can stop the user from popping 1214 * the media out of the device (no locking doors, etc) 1215 */ 1216 return USB_STOR_TRANSPORT_GOOD; 1217 } 1218 1219 usb_stor_dbg(us, "Gah! Unknown command: %d (0x%x)\n", 1220 srb->cmnd[0], srb->cmnd[0]); 1221 info->sense_key = 0x05; 1222 info->sense_asc = 0x20; 1223 info->sense_ascq = 0x00; 1224 return USB_STOR_TRANSPORT_FAILED; 1225 } 1226 1227 static struct scsi_host_template alauda_host_template; 1228 1229 static int alauda_probe(struct usb_interface *intf, 1230 const struct usb_device_id *id) 1231 { 1232 struct us_data *us; 1233 int result; 1234 1235 result = usb_stor_probe1(&us, intf, id, 1236 (id - alauda_usb_ids) + alauda_unusual_dev_list, 1237 &alauda_host_template); 1238 if (result) 1239 return result; 1240 1241 us->transport_name = "Alauda Control/Bulk"; 1242 us->transport = alauda_transport; 1243 us->transport_reset = usb_stor_Bulk_reset; 1244 us->max_lun = 1; 1245 1246 result = usb_stor_probe2(us); 1247 return result; 1248 } 1249 1250 static struct usb_driver alauda_driver = { 1251 .name = DRV_NAME, 1252 .probe = alauda_probe, 1253 .disconnect = usb_stor_disconnect, 1254 .suspend = usb_stor_suspend, 1255 .resume = usb_stor_resume, 1256 .reset_resume = usb_stor_reset_resume, 1257 .pre_reset = usb_stor_pre_reset, 1258 .post_reset = usb_stor_post_reset, 1259 .id_table = alauda_usb_ids, 1260 .soft_unbind = 1, 1261 .no_dynamic_id = 1, 1262 }; 1263 1264 module_usb_stor_driver(alauda_driver, alauda_host_template, DRV_NAME); 1265