1 /* imm.c -- low level driver for the IOMEGA MatchMaker 2 * parallel port SCSI host adapter. 3 * 4 * (The IMM is the embedded controller in the ZIP Plus drive.) 5 * 6 * My unoffical company acronym list is 21 pages long: 7 * FLA: Four letter acronym with built in facility for 8 * future expansion to five letters. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/blkdev.h> 15 #include <linux/parport.h> 16 #include <linux/workqueue.h> 17 #include <linux/delay.h> 18 #include <asm/io.h> 19 20 #include <scsi/scsi.h> 21 #include <scsi/scsi_cmnd.h> 22 #include <scsi/scsi_device.h> 23 #include <scsi/scsi_host.h> 24 25 /* The following #define is to avoid a clash with hosts.c */ 26 #define IMM_PROBE_SPP 0x0001 27 #define IMM_PROBE_PS2 0x0002 28 #define IMM_PROBE_ECR 0x0010 29 #define IMM_PROBE_EPP17 0x0100 30 #define IMM_PROBE_EPP19 0x0200 31 32 33 typedef struct { 34 struct pardevice *dev; /* Parport device entry */ 35 int base; /* Actual port address */ 36 int base_hi; /* Hi Base address for ECP-ISA chipset */ 37 int mode; /* Transfer mode */ 38 struct scsi_cmnd *cur_cmd; /* Current queued command */ 39 struct delayed_work imm_tq; /* Polling interrupt stuff */ 40 unsigned long jstart; /* Jiffies at start */ 41 unsigned failed:1; /* Failure flag */ 42 unsigned dp:1; /* Data phase present */ 43 unsigned rd:1; /* Read data in data phase */ 44 unsigned wanted:1; /* Parport sharing busy flag */ 45 wait_queue_head_t *waiting; 46 struct Scsi_Host *host; 47 struct list_head list; 48 } imm_struct; 49 50 static void imm_reset_pulse(unsigned int base); 51 static int device_check(imm_struct *dev); 52 53 #include "imm.h" 54 55 static inline imm_struct *imm_dev(struct Scsi_Host *host) 56 { 57 return *(imm_struct **)&host->hostdata; 58 } 59 60 static DEFINE_SPINLOCK(arbitration_lock); 61 62 static void got_it(imm_struct *dev) 63 { 64 dev->base = dev->dev->port->base; 65 if (dev->cur_cmd) 66 dev->cur_cmd->SCp.phase = 1; 67 else 68 wake_up(dev->waiting); 69 } 70 71 static void imm_wakeup(void *ref) 72 { 73 imm_struct *dev = (imm_struct *) ref; 74 unsigned long flags; 75 76 spin_lock_irqsave(&arbitration_lock, flags); 77 if (dev->wanted) { 78 parport_claim(dev->dev); 79 got_it(dev); 80 dev->wanted = 0; 81 } 82 spin_unlock_irqrestore(&arbitration_lock, flags); 83 } 84 85 static int imm_pb_claim(imm_struct *dev) 86 { 87 unsigned long flags; 88 int res = 1; 89 spin_lock_irqsave(&arbitration_lock, flags); 90 if (parport_claim(dev->dev) == 0) { 91 got_it(dev); 92 res = 0; 93 } 94 dev->wanted = res; 95 spin_unlock_irqrestore(&arbitration_lock, flags); 96 return res; 97 } 98 99 static void imm_pb_dismiss(imm_struct *dev) 100 { 101 unsigned long flags; 102 int wanted; 103 spin_lock_irqsave(&arbitration_lock, flags); 104 wanted = dev->wanted; 105 dev->wanted = 0; 106 spin_unlock_irqrestore(&arbitration_lock, flags); 107 if (!wanted) 108 parport_release(dev->dev); 109 } 110 111 static inline void imm_pb_release(imm_struct *dev) 112 { 113 parport_release(dev->dev); 114 } 115 116 /* This is to give the imm driver a way to modify the timings (and other 117 * parameters) by writing to the /proc/scsi/imm/0 file. 118 * Very simple method really... (Too simple, no error checking :( ) 119 * Reason: Kernel hackers HATE having to unload and reload modules for 120 * testing... 121 * Also gives a method to use a script to obtain optimum timings (TODO) 122 */ 123 static inline int imm_proc_write(imm_struct *dev, char *buffer, int length) 124 { 125 unsigned long x; 126 127 if ((length > 5) && (strncmp(buffer, "mode=", 5) == 0)) { 128 x = simple_strtoul(buffer + 5, NULL, 0); 129 dev->mode = x; 130 return length; 131 } 132 printk("imm /proc: invalid variable\n"); 133 return (-EINVAL); 134 } 135 136 static int imm_proc_info(struct Scsi_Host *host, char *buffer, char **start, 137 off_t offset, int length, int inout) 138 { 139 imm_struct *dev = imm_dev(host); 140 int len = 0; 141 142 if (inout) 143 return imm_proc_write(dev, buffer, length); 144 145 len += sprintf(buffer + len, "Version : %s\n", IMM_VERSION); 146 len += 147 sprintf(buffer + len, "Parport : %s\n", 148 dev->dev->port->name); 149 len += 150 sprintf(buffer + len, "Mode : %s\n", 151 IMM_MODE_STRING[dev->mode]); 152 153 /* Request for beyond end of buffer */ 154 if (offset > len) 155 return 0; 156 157 *start = buffer + offset; 158 len -= offset; 159 if (len > length) 160 len = length; 161 return len; 162 } 163 164 #if IMM_DEBUG > 0 165 #define imm_fail(x,y) printk("imm: imm_fail(%i) from %s at line %d\n",\ 166 y, __FUNCTION__, __LINE__); imm_fail_func(x,y); 167 static inline void 168 imm_fail_func(imm_struct *dev, int error_code) 169 #else 170 static inline void 171 imm_fail(imm_struct *dev, int error_code) 172 #endif 173 { 174 /* If we fail a device then we trash status / message bytes */ 175 if (dev->cur_cmd) { 176 dev->cur_cmd->result = error_code << 16; 177 dev->failed = 1; 178 } 179 } 180 181 /* 182 * Wait for the high bit to be set. 183 * 184 * In principle, this could be tied to an interrupt, but the adapter 185 * doesn't appear to be designed to support interrupts. We spin on 186 * the 0x80 ready bit. 187 */ 188 static unsigned char imm_wait(imm_struct *dev) 189 { 190 int k; 191 unsigned short ppb = dev->base; 192 unsigned char r; 193 194 w_ctr(ppb, 0x0c); 195 196 k = IMM_SPIN_TMO; 197 do { 198 r = r_str(ppb); 199 k--; 200 udelay(1); 201 } 202 while (!(r & 0x80) && (k)); 203 204 /* 205 * STR register (LPT base+1) to SCSI mapping: 206 * 207 * STR imm imm 208 * =================================== 209 * 0x80 S_REQ S_REQ 210 * 0x40 !S_BSY (????) 211 * 0x20 !S_CD !S_CD 212 * 0x10 !S_IO !S_IO 213 * 0x08 (????) !S_BSY 214 * 215 * imm imm meaning 216 * ================================== 217 * 0xf0 0xb8 Bit mask 218 * 0xc0 0x88 ZIP wants more data 219 * 0xd0 0x98 ZIP wants to send more data 220 * 0xe0 0xa8 ZIP is expecting SCSI command data 221 * 0xf0 0xb8 end of transfer, ZIP is sending status 222 */ 223 w_ctr(ppb, 0x04); 224 if (k) 225 return (r & 0xb8); 226 227 /* Counter expired - Time out occurred */ 228 imm_fail(dev, DID_TIME_OUT); 229 printk("imm timeout in imm_wait\n"); 230 return 0; /* command timed out */ 231 } 232 233 static int imm_negotiate(imm_struct * tmp) 234 { 235 /* 236 * The following is supposedly the IEEE 1284-1994 negotiate 237 * sequence. I have yet to obtain a copy of the above standard 238 * so this is a bit of a guess... 239 * 240 * A fair chunk of this is based on the Linux parport implementation 241 * of IEEE 1284. 242 * 243 * Return 0 if data available 244 * 1 if no data available 245 */ 246 247 unsigned short base = tmp->base; 248 unsigned char a, mode; 249 250 switch (tmp->mode) { 251 case IMM_NIBBLE: 252 mode = 0x00; 253 break; 254 case IMM_PS2: 255 mode = 0x01; 256 break; 257 default: 258 return 0; 259 } 260 261 w_ctr(base, 0x04); 262 udelay(5); 263 w_dtr(base, mode); 264 udelay(100); 265 w_ctr(base, 0x06); 266 udelay(5); 267 a = (r_str(base) & 0x20) ? 0 : 1; 268 udelay(5); 269 w_ctr(base, 0x07); 270 udelay(5); 271 w_ctr(base, 0x06); 272 273 if (a) { 274 printk 275 ("IMM: IEEE1284 negotiate indicates no data available.\n"); 276 imm_fail(tmp, DID_ERROR); 277 } 278 return a; 279 } 280 281 /* 282 * Clear EPP timeout bit. 283 */ 284 static inline void epp_reset(unsigned short ppb) 285 { 286 int i; 287 288 i = r_str(ppb); 289 w_str(ppb, i); 290 w_str(ppb, i & 0xfe); 291 } 292 293 /* 294 * Wait for empty ECP fifo (if we are in ECP fifo mode only) 295 */ 296 static inline void ecp_sync(imm_struct *dev) 297 { 298 int i, ppb_hi = dev->base_hi; 299 300 if (ppb_hi == 0) 301 return; 302 303 if ((r_ecr(ppb_hi) & 0xe0) == 0x60) { /* mode 011 == ECP fifo mode */ 304 for (i = 0; i < 100; i++) { 305 if (r_ecr(ppb_hi) & 0x01) 306 return; 307 udelay(5); 308 } 309 printk("imm: ECP sync failed as data still present in FIFO.\n"); 310 } 311 } 312 313 static int imm_byte_out(unsigned short base, const char *buffer, int len) 314 { 315 int i; 316 317 w_ctr(base, 0x4); /* apparently a sane mode */ 318 for (i = len >> 1; i; i--) { 319 w_dtr(base, *buffer++); 320 w_ctr(base, 0x5); /* Drop STROBE low */ 321 w_dtr(base, *buffer++); 322 w_ctr(base, 0x0); /* STROBE high + INIT low */ 323 } 324 w_ctr(base, 0x4); /* apparently a sane mode */ 325 return 1; /* All went well - we hope! */ 326 } 327 328 static int imm_nibble_in(unsigned short base, char *buffer, int len) 329 { 330 unsigned char l; 331 int i; 332 333 /* 334 * The following is based on documented timing signals 335 */ 336 w_ctr(base, 0x4); 337 for (i = len; i; i--) { 338 w_ctr(base, 0x6); 339 l = (r_str(base) & 0xf0) >> 4; 340 w_ctr(base, 0x5); 341 *buffer++ = (r_str(base) & 0xf0) | l; 342 w_ctr(base, 0x4); 343 } 344 return 1; /* All went well - we hope! */ 345 } 346 347 static int imm_byte_in(unsigned short base, char *buffer, int len) 348 { 349 int i; 350 351 /* 352 * The following is based on documented timing signals 353 */ 354 w_ctr(base, 0x4); 355 for (i = len; i; i--) { 356 w_ctr(base, 0x26); 357 *buffer++ = r_dtr(base); 358 w_ctr(base, 0x25); 359 } 360 return 1; /* All went well - we hope! */ 361 } 362 363 static int imm_out(imm_struct *dev, char *buffer, int len) 364 { 365 unsigned short ppb = dev->base; 366 int r = imm_wait(dev); 367 368 /* 369 * Make sure that: 370 * a) the SCSI bus is BUSY (device still listening) 371 * b) the device is listening 372 */ 373 if ((r & 0x18) != 0x08) { 374 imm_fail(dev, DID_ERROR); 375 printk("IMM: returned SCSI status %2x\n", r); 376 return 0; 377 } 378 switch (dev->mode) { 379 case IMM_EPP_32: 380 case IMM_EPP_16: 381 case IMM_EPP_8: 382 epp_reset(ppb); 383 w_ctr(ppb, 0x4); 384 #ifdef CONFIG_SCSI_IZIP_EPP16 385 if (!(((long) buffer | len) & 0x01)) 386 outsw(ppb + 4, buffer, len >> 1); 387 #else 388 if (!(((long) buffer | len) & 0x03)) 389 outsl(ppb + 4, buffer, len >> 2); 390 #endif 391 else 392 outsb(ppb + 4, buffer, len); 393 w_ctr(ppb, 0xc); 394 r = !(r_str(ppb) & 0x01); 395 w_ctr(ppb, 0xc); 396 ecp_sync(dev); 397 break; 398 399 case IMM_NIBBLE: 400 case IMM_PS2: 401 /* 8 bit output, with a loop */ 402 r = imm_byte_out(ppb, buffer, len); 403 break; 404 405 default: 406 printk("IMM: bug in imm_out()\n"); 407 r = 0; 408 } 409 return r; 410 } 411 412 static int imm_in(imm_struct *dev, char *buffer, int len) 413 { 414 unsigned short ppb = dev->base; 415 int r = imm_wait(dev); 416 417 /* 418 * Make sure that: 419 * a) the SCSI bus is BUSY (device still listening) 420 * b) the device is sending data 421 */ 422 if ((r & 0x18) != 0x18) { 423 imm_fail(dev, DID_ERROR); 424 return 0; 425 } 426 switch (dev->mode) { 427 case IMM_NIBBLE: 428 /* 4 bit input, with a loop */ 429 r = imm_nibble_in(ppb, buffer, len); 430 w_ctr(ppb, 0xc); 431 break; 432 433 case IMM_PS2: 434 /* 8 bit input, with a loop */ 435 r = imm_byte_in(ppb, buffer, len); 436 w_ctr(ppb, 0xc); 437 break; 438 439 case IMM_EPP_32: 440 case IMM_EPP_16: 441 case IMM_EPP_8: 442 epp_reset(ppb); 443 w_ctr(ppb, 0x24); 444 #ifdef CONFIG_SCSI_IZIP_EPP16 445 if (!(((long) buffer | len) & 0x01)) 446 insw(ppb + 4, buffer, len >> 1); 447 #else 448 if (!(((long) buffer | len) & 0x03)) 449 insl(ppb + 4, buffer, len >> 2); 450 #endif 451 else 452 insb(ppb + 4, buffer, len); 453 w_ctr(ppb, 0x2c); 454 r = !(r_str(ppb) & 0x01); 455 w_ctr(ppb, 0x2c); 456 ecp_sync(dev); 457 break; 458 459 default: 460 printk("IMM: bug in imm_ins()\n"); 461 r = 0; 462 break; 463 } 464 return r; 465 } 466 467 static int imm_cpp(unsigned short ppb, unsigned char b) 468 { 469 /* 470 * Comments on udelay values refer to the 471 * Command Packet Protocol (CPP) timing diagram. 472 */ 473 474 unsigned char s1, s2, s3; 475 w_ctr(ppb, 0x0c); 476 udelay(2); /* 1 usec - infinite */ 477 w_dtr(ppb, 0xaa); 478 udelay(10); /* 7 usec - infinite */ 479 w_dtr(ppb, 0x55); 480 udelay(10); /* 7 usec - infinite */ 481 w_dtr(ppb, 0x00); 482 udelay(10); /* 7 usec - infinite */ 483 w_dtr(ppb, 0xff); 484 udelay(10); /* 7 usec - infinite */ 485 s1 = r_str(ppb) & 0xb8; 486 w_dtr(ppb, 0x87); 487 udelay(10); /* 7 usec - infinite */ 488 s2 = r_str(ppb) & 0xb8; 489 w_dtr(ppb, 0x78); 490 udelay(10); /* 7 usec - infinite */ 491 s3 = r_str(ppb) & 0x38; 492 /* 493 * Values for b are: 494 * 0000 00aa Assign address aa to current device 495 * 0010 00aa Select device aa in EPP Winbond mode 496 * 0010 10aa Select device aa in EPP mode 497 * 0011 xxxx Deselect all devices 498 * 0110 00aa Test device aa 499 * 1101 00aa Select device aa in ECP mode 500 * 1110 00aa Select device aa in Compatible mode 501 */ 502 w_dtr(ppb, b); 503 udelay(2); /* 1 usec - infinite */ 504 w_ctr(ppb, 0x0c); 505 udelay(10); /* 7 usec - infinite */ 506 w_ctr(ppb, 0x0d); 507 udelay(2); /* 1 usec - infinite */ 508 w_ctr(ppb, 0x0c); 509 udelay(10); /* 7 usec - infinite */ 510 w_dtr(ppb, 0xff); 511 udelay(10); /* 7 usec - infinite */ 512 513 /* 514 * The following table is electrical pin values. 515 * (BSY is inverted at the CTR register) 516 * 517 * BSY ACK POut SEL Fault 518 * S1 0 X 1 1 1 519 * S2 1 X 0 1 1 520 * S3 L X 1 1 S 521 * 522 * L => Last device in chain 523 * S => Selected 524 * 525 * Observered values for S1,S2,S3 are: 526 * Disconnect => f8/58/78 527 * Connect => f8/58/70 528 */ 529 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x30)) 530 return 1; /* Connected */ 531 if ((s1 == 0xb8) && (s2 == 0x18) && (s3 == 0x38)) 532 return 0; /* Disconnected */ 533 534 return -1; /* No device present */ 535 } 536 537 static inline int imm_connect(imm_struct *dev, int flag) 538 { 539 unsigned short ppb = dev->base; 540 541 imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ 542 imm_cpp(ppb, 0x30); /* Disconnect all devices */ 543 544 if ((dev->mode == IMM_EPP_8) || 545 (dev->mode == IMM_EPP_16) || 546 (dev->mode == IMM_EPP_32)) 547 return imm_cpp(ppb, 0x28); /* Select device 0 in EPP mode */ 548 return imm_cpp(ppb, 0xe0); /* Select device 0 in compatible mode */ 549 } 550 551 static void imm_disconnect(imm_struct *dev) 552 { 553 imm_cpp(dev->base, 0x30); /* Disconnect all devices */ 554 } 555 556 static int imm_select(imm_struct *dev, int target) 557 { 558 int k; 559 unsigned short ppb = dev->base; 560 561 /* 562 * Firstly we want to make sure there is nothing 563 * holding onto the SCSI bus. 564 */ 565 w_ctr(ppb, 0xc); 566 567 k = IMM_SELECT_TMO; 568 do { 569 k--; 570 } while ((r_str(ppb) & 0x08) && (k)); 571 572 if (!k) 573 return 0; 574 575 /* 576 * Now assert the SCSI ID (HOST and TARGET) on the data bus 577 */ 578 w_ctr(ppb, 0x4); 579 w_dtr(ppb, 0x80 | (1 << target)); 580 udelay(1); 581 582 /* 583 * Deassert SELIN first followed by STROBE 584 */ 585 w_ctr(ppb, 0xc); 586 w_ctr(ppb, 0xd); 587 588 /* 589 * ACK should drop low while SELIN is deasserted. 590 * FAULT should drop low when the SCSI device latches the bus. 591 */ 592 k = IMM_SELECT_TMO; 593 do { 594 k--; 595 } 596 while (!(r_str(ppb) & 0x08) && (k)); 597 598 /* 599 * Place the interface back into a sane state (status mode) 600 */ 601 w_ctr(ppb, 0xc); 602 return (k) ? 1 : 0; 603 } 604 605 static int imm_init(imm_struct *dev) 606 { 607 if (imm_connect(dev, 0) != 1) 608 return -EIO; 609 imm_reset_pulse(dev->base); 610 mdelay(1); /* Delay to allow devices to settle */ 611 imm_disconnect(dev); 612 mdelay(1); /* Another delay to allow devices to settle */ 613 return device_check(dev); 614 } 615 616 static inline int imm_send_command(struct scsi_cmnd *cmd) 617 { 618 imm_struct *dev = imm_dev(cmd->device->host); 619 int k; 620 621 /* NOTE: IMM uses byte pairs */ 622 for (k = 0; k < cmd->cmd_len; k += 2) 623 if (!imm_out(dev, &cmd->cmnd[k], 2)) 624 return 0; 625 return 1; 626 } 627 628 /* 629 * The bulk flag enables some optimisations in the data transfer loops, 630 * it should be true for any command that transfers data in integral 631 * numbers of sectors. 632 * 633 * The driver appears to remain stable if we speed up the parallel port 634 * i/o in this function, but not elsewhere. 635 */ 636 static int imm_completion(struct scsi_cmnd *cmd) 637 { 638 /* Return codes: 639 * -1 Error 640 * 0 Told to schedule 641 * 1 Finished data transfer 642 */ 643 imm_struct *dev = imm_dev(cmd->device->host); 644 unsigned short ppb = dev->base; 645 unsigned long start_jiffies = jiffies; 646 647 unsigned char r, v; 648 int fast, bulk, status; 649 650 v = cmd->cmnd[0]; 651 bulk = ((v == READ_6) || 652 (v == READ_10) || (v == WRITE_6) || (v == WRITE_10)); 653 654 /* 655 * We only get here if the drive is ready to comunicate, 656 * hence no need for a full imm_wait. 657 */ 658 w_ctr(ppb, 0x0c); 659 r = (r_str(ppb) & 0xb8); 660 661 /* 662 * while (device is not ready to send status byte) 663 * loop; 664 */ 665 while (r != (unsigned char) 0xb8) { 666 /* 667 * If we have been running for more than a full timer tick 668 * then take a rest. 669 */ 670 if (time_after(jiffies, start_jiffies + 1)) 671 return 0; 672 673 /* 674 * FAIL if: 675 * a) Drive status is screwy (!ready && !present) 676 * b) Drive is requesting/sending more data than expected 677 */ 678 if (((r & 0x88) != 0x88) || (cmd->SCp.this_residual <= 0)) { 679 imm_fail(dev, DID_ERROR); 680 return -1; /* ERROR_RETURN */ 681 } 682 /* determine if we should use burst I/O */ 683 if (dev->rd == 0) { 684 fast = (bulk 685 && (cmd->SCp.this_residual >= 686 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 2; 687 status = imm_out(dev, cmd->SCp.ptr, fast); 688 } else { 689 fast = (bulk 690 && (cmd->SCp.this_residual >= 691 IMM_BURST_SIZE)) ? IMM_BURST_SIZE : 1; 692 status = imm_in(dev, cmd->SCp.ptr, fast); 693 } 694 695 cmd->SCp.ptr += fast; 696 cmd->SCp.this_residual -= fast; 697 698 if (!status) { 699 imm_fail(dev, DID_BUS_BUSY); 700 return -1; /* ERROR_RETURN */ 701 } 702 if (cmd->SCp.buffer && !cmd->SCp.this_residual) { 703 /* if scatter/gather, advance to the next segment */ 704 if (cmd->SCp.buffers_residual--) { 705 cmd->SCp.buffer++; 706 cmd->SCp.this_residual = 707 cmd->SCp.buffer->length; 708 cmd->SCp.ptr = 709 page_address(cmd->SCp.buffer->page) + 710 cmd->SCp.buffer->offset; 711 712 /* 713 * Make sure that we transfer even number of bytes 714 * otherwise it makes imm_byte_out() messy. 715 */ 716 if (cmd->SCp.this_residual & 0x01) 717 cmd->SCp.this_residual++; 718 } 719 } 720 /* Now check to see if the drive is ready to comunicate */ 721 w_ctr(ppb, 0x0c); 722 r = (r_str(ppb) & 0xb8); 723 724 /* If not, drop back down to the scheduler and wait a timer tick */ 725 if (!(r & 0x80)) 726 return 0; 727 } 728 return 1; /* FINISH_RETURN */ 729 } 730 731 /* 732 * Since the IMM itself doesn't generate interrupts, we use 733 * the scheduler's task queue to generate a stream of call-backs and 734 * complete the request when the drive is ready. 735 */ 736 static void imm_interrupt(struct work_struct *work) 737 { 738 imm_struct *dev = container_of(work, imm_struct, imm_tq.work); 739 struct scsi_cmnd *cmd = dev->cur_cmd; 740 struct Scsi_Host *host = cmd->device->host; 741 unsigned long flags; 742 743 if (imm_engine(dev, cmd)) { 744 schedule_delayed_work(&dev->imm_tq, 1); 745 return; 746 } 747 /* Command must of completed hence it is safe to let go... */ 748 #if IMM_DEBUG > 0 749 switch ((cmd->result >> 16) & 0xff) { 750 case DID_OK: 751 break; 752 case DID_NO_CONNECT: 753 printk("imm: no device at SCSI ID %i\n", cmd->device->id); 754 break; 755 case DID_BUS_BUSY: 756 printk("imm: BUS BUSY - EPP timeout detected\n"); 757 break; 758 case DID_TIME_OUT: 759 printk("imm: unknown timeout\n"); 760 break; 761 case DID_ABORT: 762 printk("imm: told to abort\n"); 763 break; 764 case DID_PARITY: 765 printk("imm: parity error (???)\n"); 766 break; 767 case DID_ERROR: 768 printk("imm: internal driver error\n"); 769 break; 770 case DID_RESET: 771 printk("imm: told to reset device\n"); 772 break; 773 case DID_BAD_INTR: 774 printk("imm: bad interrupt (???)\n"); 775 break; 776 default: 777 printk("imm: bad return code (%02x)\n", 778 (cmd->result >> 16) & 0xff); 779 } 780 #endif 781 782 if (cmd->SCp.phase > 1) 783 imm_disconnect(dev); 784 785 imm_pb_dismiss(dev); 786 787 spin_lock_irqsave(host->host_lock, flags); 788 dev->cur_cmd = NULL; 789 cmd->scsi_done(cmd); 790 spin_unlock_irqrestore(host->host_lock, flags); 791 return; 792 } 793 794 static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) 795 { 796 unsigned short ppb = dev->base; 797 unsigned char l = 0, h = 0; 798 int retv, x; 799 800 /* First check for any errors that may have occurred 801 * Here we check for internal errors 802 */ 803 if (dev->failed) 804 return 0; 805 806 switch (cmd->SCp.phase) { 807 case 0: /* Phase 0 - Waiting for parport */ 808 if (time_after(jiffies, dev->jstart + HZ)) { 809 /* 810 * We waited more than a second 811 * for parport to call us 812 */ 813 imm_fail(dev, DID_BUS_BUSY); 814 return 0; 815 } 816 return 1; /* wait until imm_wakeup claims parport */ 817 /* Phase 1 - Connected */ 818 case 1: 819 imm_connect(dev, CONNECT_EPP_MAYBE); 820 cmd->SCp.phase++; 821 822 /* Phase 2 - We are now talking to the scsi bus */ 823 case 2: 824 if (!imm_select(dev, scmd_id(cmd))) { 825 imm_fail(dev, DID_NO_CONNECT); 826 return 0; 827 } 828 cmd->SCp.phase++; 829 830 /* Phase 3 - Ready to accept a command */ 831 case 3: 832 w_ctr(ppb, 0x0c); 833 if (!(r_str(ppb) & 0x80)) 834 return 1; 835 836 if (!imm_send_command(cmd)) 837 return 0; 838 cmd->SCp.phase++; 839 840 /* Phase 4 - Setup scatter/gather buffers */ 841 case 4: 842 if (cmd->use_sg) { 843 /* if many buffers are available, start filling the first */ 844 cmd->SCp.buffer = 845 (struct scatterlist *) cmd->request_buffer; 846 cmd->SCp.this_residual = cmd->SCp.buffer->length; 847 cmd->SCp.ptr = 848 page_address(cmd->SCp.buffer->page) + 849 cmd->SCp.buffer->offset; 850 } else { 851 /* else fill the only available buffer */ 852 cmd->SCp.buffer = NULL; 853 cmd->SCp.this_residual = cmd->request_bufflen; 854 cmd->SCp.ptr = cmd->request_buffer; 855 } 856 cmd->SCp.buffers_residual = cmd->use_sg - 1; 857 cmd->SCp.phase++; 858 if (cmd->SCp.this_residual & 0x01) 859 cmd->SCp.this_residual++; 860 /* Phase 5 - Pre-Data transfer stage */ 861 case 5: 862 /* Spin lock for BUSY */ 863 w_ctr(ppb, 0x0c); 864 if (!(r_str(ppb) & 0x80)) 865 return 1; 866 867 /* Require negotiation for read requests */ 868 x = (r_str(ppb) & 0xb8); 869 dev->rd = (x & 0x10) ? 1 : 0; 870 dev->dp = (x & 0x20) ? 0 : 1; 871 872 if ((dev->dp) && (dev->rd)) 873 if (imm_negotiate(dev)) 874 return 0; 875 cmd->SCp.phase++; 876 877 /* Phase 6 - Data transfer stage */ 878 case 6: 879 /* Spin lock for BUSY */ 880 w_ctr(ppb, 0x0c); 881 if (!(r_str(ppb) & 0x80)) 882 return 1; 883 884 if (dev->dp) { 885 retv = imm_completion(cmd); 886 if (retv == -1) 887 return 0; 888 if (retv == 0) 889 return 1; 890 } 891 cmd->SCp.phase++; 892 893 /* Phase 7 - Post data transfer stage */ 894 case 7: 895 if ((dev->dp) && (dev->rd)) { 896 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { 897 w_ctr(ppb, 0x4); 898 w_ctr(ppb, 0xc); 899 w_ctr(ppb, 0xe); 900 w_ctr(ppb, 0x4); 901 } 902 } 903 cmd->SCp.phase++; 904 905 /* Phase 8 - Read status/message */ 906 case 8: 907 /* Check for data overrun */ 908 if (imm_wait(dev) != (unsigned char) 0xb8) { 909 imm_fail(dev, DID_ERROR); 910 return 0; 911 } 912 if (imm_negotiate(dev)) 913 return 0; 914 if (imm_in(dev, &l, 1)) { /* read status byte */ 915 /* Check for optional message byte */ 916 if (imm_wait(dev) == (unsigned char) 0xb8) 917 imm_in(dev, &h, 1); 918 cmd->result = (DID_OK << 16) + (l & STATUS_MASK); 919 } 920 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { 921 w_ctr(ppb, 0x4); 922 w_ctr(ppb, 0xc); 923 w_ctr(ppb, 0xe); 924 w_ctr(ppb, 0x4); 925 } 926 return 0; /* Finished */ 927 break; 928 929 default: 930 printk("imm: Invalid scsi phase\n"); 931 } 932 return 0; 933 } 934 935 static int imm_queuecommand(struct scsi_cmnd *cmd, 936 void (*done)(struct scsi_cmnd *)) 937 { 938 imm_struct *dev = imm_dev(cmd->device->host); 939 940 if (dev->cur_cmd) { 941 printk("IMM: bug in imm_queuecommand\n"); 942 return 0; 943 } 944 dev->failed = 0; 945 dev->jstart = jiffies; 946 dev->cur_cmd = cmd; 947 cmd->scsi_done = done; 948 cmd->result = DID_ERROR << 16; /* default return code */ 949 cmd->SCp.phase = 0; /* bus free */ 950 951 schedule_delayed_work(&dev->imm_tq, 0); 952 953 imm_pb_claim(dev); 954 955 return 0; 956 } 957 958 /* 959 * Apparently the disk->capacity attribute is off by 1 sector 960 * for all disk drives. We add the one here, but it should really 961 * be done in sd.c. Even if it gets fixed there, this will still 962 * work. 963 */ 964 static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev, 965 sector_t capacity, int ip[]) 966 { 967 ip[0] = 0x40; 968 ip[1] = 0x20; 969 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); 970 if (ip[2] > 1024) { 971 ip[0] = 0xff; 972 ip[1] = 0x3f; 973 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); 974 } 975 return 0; 976 } 977 978 static int imm_abort(struct scsi_cmnd *cmd) 979 { 980 imm_struct *dev = imm_dev(cmd->device->host); 981 /* 982 * There is no method for aborting commands since Iomega 983 * have tied the SCSI_MESSAGE line high in the interface 984 */ 985 986 switch (cmd->SCp.phase) { 987 case 0: /* Do not have access to parport */ 988 case 1: /* Have not connected to interface */ 989 dev->cur_cmd = NULL; /* Forget the problem */ 990 return SUCCESS; 991 break; 992 default: /* SCSI command sent, can not abort */ 993 return FAILED; 994 break; 995 } 996 } 997 998 static void imm_reset_pulse(unsigned int base) 999 { 1000 w_ctr(base, 0x04); 1001 w_dtr(base, 0x40); 1002 udelay(1); 1003 w_ctr(base, 0x0c); 1004 w_ctr(base, 0x0d); 1005 udelay(50); 1006 w_ctr(base, 0x0c); 1007 w_ctr(base, 0x04); 1008 } 1009 1010 static int imm_reset(struct scsi_cmnd *cmd) 1011 { 1012 imm_struct *dev = imm_dev(cmd->device->host); 1013 1014 if (cmd->SCp.phase) 1015 imm_disconnect(dev); 1016 dev->cur_cmd = NULL; /* Forget the problem */ 1017 1018 imm_connect(dev, CONNECT_NORMAL); 1019 imm_reset_pulse(dev->base); 1020 mdelay(1); /* device settle delay */ 1021 imm_disconnect(dev); 1022 mdelay(1); /* device settle delay */ 1023 return SUCCESS; 1024 } 1025 1026 static int device_check(imm_struct *dev) 1027 { 1028 /* This routine looks for a device and then attempts to use EPP 1029 to send a command. If all goes as planned then EPP is available. */ 1030 1031 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 1032 int loop, old_mode, status, k, ppb = dev->base; 1033 unsigned char l; 1034 1035 old_mode = dev->mode; 1036 for (loop = 0; loop < 8; loop++) { 1037 /* Attempt to use EPP for Test Unit Ready */ 1038 if ((ppb & 0x0007) == 0x0000) 1039 dev->mode = IMM_EPP_32; 1040 1041 second_pass: 1042 imm_connect(dev, CONNECT_EPP_MAYBE); 1043 /* Select SCSI device */ 1044 if (!imm_select(dev, loop)) { 1045 imm_disconnect(dev); 1046 continue; 1047 } 1048 printk("imm: Found device at ID %i, Attempting to use %s\n", 1049 loop, IMM_MODE_STRING[dev->mode]); 1050 1051 /* Send SCSI command */ 1052 status = 1; 1053 w_ctr(ppb, 0x0c); 1054 for (l = 0; (l < 3) && (status); l++) 1055 status = imm_out(dev, &cmd[l << 1], 2); 1056 1057 if (!status) { 1058 imm_disconnect(dev); 1059 imm_connect(dev, CONNECT_EPP_MAYBE); 1060 imm_reset_pulse(dev->base); 1061 udelay(1000); 1062 imm_disconnect(dev); 1063 udelay(1000); 1064 if (dev->mode == IMM_EPP_32) { 1065 dev->mode = old_mode; 1066 goto second_pass; 1067 } 1068 printk("imm: Unable to establish communication\n"); 1069 return -EIO; 1070 } 1071 w_ctr(ppb, 0x0c); 1072 1073 k = 1000000; /* 1 Second */ 1074 do { 1075 l = r_str(ppb); 1076 k--; 1077 udelay(1); 1078 } while (!(l & 0x80) && (k)); 1079 1080 l &= 0xb8; 1081 1082 if (l != 0xb8) { 1083 imm_disconnect(dev); 1084 imm_connect(dev, CONNECT_EPP_MAYBE); 1085 imm_reset_pulse(dev->base); 1086 udelay(1000); 1087 imm_disconnect(dev); 1088 udelay(1000); 1089 if (dev->mode == IMM_EPP_32) { 1090 dev->mode = old_mode; 1091 goto second_pass; 1092 } 1093 printk 1094 ("imm: Unable to establish communication\n"); 1095 return -EIO; 1096 } 1097 imm_disconnect(dev); 1098 printk 1099 ("imm: Communication established at 0x%x with ID %i using %s\n", 1100 ppb, loop, IMM_MODE_STRING[dev->mode]); 1101 imm_connect(dev, CONNECT_EPP_MAYBE); 1102 imm_reset_pulse(dev->base); 1103 udelay(1000); 1104 imm_disconnect(dev); 1105 udelay(1000); 1106 return 0; 1107 } 1108 printk("imm: No devices found\n"); 1109 return -ENODEV; 1110 } 1111 1112 /* 1113 * imm cannot deal with highmem, so this causes all IO pages for this host 1114 * to reside in low memory (hence mapped) 1115 */ 1116 static int imm_adjust_queue(struct scsi_device *device) 1117 { 1118 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); 1119 return 0; 1120 } 1121 1122 static struct scsi_host_template imm_template = { 1123 .module = THIS_MODULE, 1124 .proc_name = "imm", 1125 .proc_info = imm_proc_info, 1126 .name = "Iomega VPI2 (imm) interface", 1127 .queuecommand = imm_queuecommand, 1128 .eh_abort_handler = imm_abort, 1129 .eh_bus_reset_handler = imm_reset, 1130 .eh_host_reset_handler = imm_reset, 1131 .bios_param = imm_biosparam, 1132 .this_id = 7, 1133 .sg_tablesize = SG_ALL, 1134 .cmd_per_lun = 1, 1135 .use_clustering = ENABLE_CLUSTERING, 1136 .can_queue = 1, 1137 .slave_alloc = imm_adjust_queue, 1138 }; 1139 1140 /*************************************************************************** 1141 * Parallel port probing routines * 1142 ***************************************************************************/ 1143 1144 static LIST_HEAD(imm_hosts); 1145 1146 static int __imm_attach(struct parport *pb) 1147 { 1148 struct Scsi_Host *host; 1149 imm_struct *dev; 1150 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); 1151 DEFINE_WAIT(wait); 1152 int ports; 1153 int modes, ppb; 1154 int err = -ENOMEM; 1155 1156 init_waitqueue_head(&waiting); 1157 1158 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); 1159 if (!dev) 1160 return -ENOMEM; 1161 1162 1163 dev->base = -1; 1164 dev->mode = IMM_AUTODETECT; 1165 INIT_LIST_HEAD(&dev->list); 1166 1167 dev->dev = parport_register_device(pb, "imm", NULL, imm_wakeup, 1168 NULL, 0, dev); 1169 1170 if (!dev->dev) 1171 goto out; 1172 1173 1174 /* Claim the bus so it remembers what we do to the control 1175 * registers. [ CTR and ECP ] 1176 */ 1177 err = -EBUSY; 1178 dev->waiting = &waiting; 1179 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); 1180 if (imm_pb_claim(dev)) 1181 schedule_timeout(3 * HZ); 1182 if (dev->wanted) { 1183 printk(KERN_ERR "imm%d: failed to claim parport because " 1184 "a pardevice is owning the port for too long " 1185 "time!\n", pb->number); 1186 imm_pb_dismiss(dev); 1187 dev->waiting = NULL; 1188 finish_wait(&waiting, &wait); 1189 goto out1; 1190 } 1191 dev->waiting = NULL; 1192 finish_wait(&waiting, &wait); 1193 ppb = dev->base = dev->dev->port->base; 1194 dev->base_hi = dev->dev->port->base_hi; 1195 w_ctr(ppb, 0x0c); 1196 modes = dev->dev->port->modes; 1197 1198 /* Mode detection works up the chain of speed 1199 * This avoids a nasty if-then-else-if-... tree 1200 */ 1201 dev->mode = IMM_NIBBLE; 1202 1203 if (modes & PARPORT_MODE_TRISTATE) 1204 dev->mode = IMM_PS2; 1205 1206 /* Done configuration */ 1207 1208 err = imm_init(dev); 1209 1210 imm_pb_release(dev); 1211 1212 if (err) 1213 goto out1; 1214 1215 /* now the glue ... */ 1216 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) 1217 ports = 3; 1218 else 1219 ports = 8; 1220 1221 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); 1222 1223 err = -ENOMEM; 1224 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); 1225 if (!host) 1226 goto out1; 1227 host->io_port = pb->base; 1228 host->n_io_port = ports; 1229 host->dma_channel = -1; 1230 host->unique_id = pb->number; 1231 *(imm_struct **)&host->hostdata = dev; 1232 dev->host = host; 1233 list_add_tail(&dev->list, &imm_hosts); 1234 err = scsi_add_host(host, NULL); 1235 if (err) 1236 goto out2; 1237 scsi_scan_host(host); 1238 return 0; 1239 1240 out2: 1241 list_del_init(&dev->list); 1242 scsi_host_put(host); 1243 out1: 1244 parport_unregister_device(dev->dev); 1245 out: 1246 kfree(dev); 1247 return err; 1248 } 1249 1250 static void imm_attach(struct parport *pb) 1251 { 1252 __imm_attach(pb); 1253 } 1254 1255 static void imm_detach(struct parport *pb) 1256 { 1257 imm_struct *dev; 1258 list_for_each_entry(dev, &imm_hosts, list) { 1259 if (dev->dev->port == pb) { 1260 list_del_init(&dev->list); 1261 scsi_remove_host(dev->host); 1262 scsi_host_put(dev->host); 1263 parport_unregister_device(dev->dev); 1264 kfree(dev); 1265 break; 1266 } 1267 } 1268 } 1269 1270 static struct parport_driver imm_driver = { 1271 .name = "imm", 1272 .attach = imm_attach, 1273 .detach = imm_detach, 1274 }; 1275 1276 static int __init imm_driver_init(void) 1277 { 1278 printk("imm: Version %s\n", IMM_VERSION); 1279 return parport_register_driver(&imm_driver); 1280 } 1281 1282 static void __exit imm_driver_exit(void) 1283 { 1284 parport_unregister_driver(&imm_driver); 1285 } 1286 1287 module_init(imm_driver_init); 1288 module_exit(imm_driver_exit); 1289 1290 MODULE_LICENSE("GPL"); 1291