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 = sg_virt(cmd->SCp.buffer); 709 710 /* 711 * Make sure that we transfer even number of bytes 712 * otherwise it makes imm_byte_out() messy. 713 */ 714 if (cmd->SCp.this_residual & 0x01) 715 cmd->SCp.this_residual++; 716 } 717 } 718 /* Now check to see if the drive is ready to comunicate */ 719 w_ctr(ppb, 0x0c); 720 r = (r_str(ppb) & 0xb8); 721 722 /* If not, drop back down to the scheduler and wait a timer tick */ 723 if (!(r & 0x80)) 724 return 0; 725 } 726 return 1; /* FINISH_RETURN */ 727 } 728 729 /* 730 * Since the IMM itself doesn't generate interrupts, we use 731 * the scheduler's task queue to generate a stream of call-backs and 732 * complete the request when the drive is ready. 733 */ 734 static void imm_interrupt(struct work_struct *work) 735 { 736 imm_struct *dev = container_of(work, imm_struct, imm_tq.work); 737 struct scsi_cmnd *cmd = dev->cur_cmd; 738 struct Scsi_Host *host = cmd->device->host; 739 unsigned long flags; 740 741 if (imm_engine(dev, cmd)) { 742 schedule_delayed_work(&dev->imm_tq, 1); 743 return; 744 } 745 /* Command must of completed hence it is safe to let go... */ 746 #if IMM_DEBUG > 0 747 switch ((cmd->result >> 16) & 0xff) { 748 case DID_OK: 749 break; 750 case DID_NO_CONNECT: 751 printk("imm: no device at SCSI ID %i\n", cmd->device->id); 752 break; 753 case DID_BUS_BUSY: 754 printk("imm: BUS BUSY - EPP timeout detected\n"); 755 break; 756 case DID_TIME_OUT: 757 printk("imm: unknown timeout\n"); 758 break; 759 case DID_ABORT: 760 printk("imm: told to abort\n"); 761 break; 762 case DID_PARITY: 763 printk("imm: parity error (???)\n"); 764 break; 765 case DID_ERROR: 766 printk("imm: internal driver error\n"); 767 break; 768 case DID_RESET: 769 printk("imm: told to reset device\n"); 770 break; 771 case DID_BAD_INTR: 772 printk("imm: bad interrupt (???)\n"); 773 break; 774 default: 775 printk("imm: bad return code (%02x)\n", 776 (cmd->result >> 16) & 0xff); 777 } 778 #endif 779 780 if (cmd->SCp.phase > 1) 781 imm_disconnect(dev); 782 783 imm_pb_dismiss(dev); 784 785 spin_lock_irqsave(host->host_lock, flags); 786 dev->cur_cmd = NULL; 787 cmd->scsi_done(cmd); 788 spin_unlock_irqrestore(host->host_lock, flags); 789 return; 790 } 791 792 static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd) 793 { 794 unsigned short ppb = dev->base; 795 unsigned char l = 0, h = 0; 796 int retv, x; 797 798 /* First check for any errors that may have occurred 799 * Here we check for internal errors 800 */ 801 if (dev->failed) 802 return 0; 803 804 switch (cmd->SCp.phase) { 805 case 0: /* Phase 0 - Waiting for parport */ 806 if (time_after(jiffies, dev->jstart + HZ)) { 807 /* 808 * We waited more than a second 809 * for parport to call us 810 */ 811 imm_fail(dev, DID_BUS_BUSY); 812 return 0; 813 } 814 return 1; /* wait until imm_wakeup claims parport */ 815 /* Phase 1 - Connected */ 816 case 1: 817 imm_connect(dev, CONNECT_EPP_MAYBE); 818 cmd->SCp.phase++; 819 820 /* Phase 2 - We are now talking to the scsi bus */ 821 case 2: 822 if (!imm_select(dev, scmd_id(cmd))) { 823 imm_fail(dev, DID_NO_CONNECT); 824 return 0; 825 } 826 cmd->SCp.phase++; 827 828 /* Phase 3 - Ready to accept a command */ 829 case 3: 830 w_ctr(ppb, 0x0c); 831 if (!(r_str(ppb) & 0x80)) 832 return 1; 833 834 if (!imm_send_command(cmd)) 835 return 0; 836 cmd->SCp.phase++; 837 838 /* Phase 4 - Setup scatter/gather buffers */ 839 case 4: 840 if (cmd->use_sg) { 841 /* if many buffers are available, start filling the first */ 842 cmd->SCp.buffer = 843 (struct scatterlist *) cmd->request_buffer; 844 cmd->SCp.this_residual = cmd->SCp.buffer->length; 845 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 846 } else { 847 /* else fill the only available buffer */ 848 cmd->SCp.buffer = NULL; 849 cmd->SCp.this_residual = cmd->request_bufflen; 850 cmd->SCp.ptr = cmd->request_buffer; 851 } 852 cmd->SCp.buffers_residual = cmd->use_sg - 1; 853 cmd->SCp.phase++; 854 if (cmd->SCp.this_residual & 0x01) 855 cmd->SCp.this_residual++; 856 /* Phase 5 - Pre-Data transfer stage */ 857 case 5: 858 /* Spin lock for BUSY */ 859 w_ctr(ppb, 0x0c); 860 if (!(r_str(ppb) & 0x80)) 861 return 1; 862 863 /* Require negotiation for read requests */ 864 x = (r_str(ppb) & 0xb8); 865 dev->rd = (x & 0x10) ? 1 : 0; 866 dev->dp = (x & 0x20) ? 0 : 1; 867 868 if ((dev->dp) && (dev->rd)) 869 if (imm_negotiate(dev)) 870 return 0; 871 cmd->SCp.phase++; 872 873 /* Phase 6 - Data transfer stage */ 874 case 6: 875 /* Spin lock for BUSY */ 876 w_ctr(ppb, 0x0c); 877 if (!(r_str(ppb) & 0x80)) 878 return 1; 879 880 if (dev->dp) { 881 retv = imm_completion(cmd); 882 if (retv == -1) 883 return 0; 884 if (retv == 0) 885 return 1; 886 } 887 cmd->SCp.phase++; 888 889 /* Phase 7 - Post data transfer stage */ 890 case 7: 891 if ((dev->dp) && (dev->rd)) { 892 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { 893 w_ctr(ppb, 0x4); 894 w_ctr(ppb, 0xc); 895 w_ctr(ppb, 0xe); 896 w_ctr(ppb, 0x4); 897 } 898 } 899 cmd->SCp.phase++; 900 901 /* Phase 8 - Read status/message */ 902 case 8: 903 /* Check for data overrun */ 904 if (imm_wait(dev) != (unsigned char) 0xb8) { 905 imm_fail(dev, DID_ERROR); 906 return 0; 907 } 908 if (imm_negotiate(dev)) 909 return 0; 910 if (imm_in(dev, &l, 1)) { /* read status byte */ 911 /* Check for optional message byte */ 912 if (imm_wait(dev) == (unsigned char) 0xb8) 913 imm_in(dev, &h, 1); 914 cmd->result = (DID_OK << 16) + (l & STATUS_MASK); 915 } 916 if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) { 917 w_ctr(ppb, 0x4); 918 w_ctr(ppb, 0xc); 919 w_ctr(ppb, 0xe); 920 w_ctr(ppb, 0x4); 921 } 922 return 0; /* Finished */ 923 break; 924 925 default: 926 printk("imm: Invalid scsi phase\n"); 927 } 928 return 0; 929 } 930 931 static int imm_queuecommand(struct scsi_cmnd *cmd, 932 void (*done)(struct scsi_cmnd *)) 933 { 934 imm_struct *dev = imm_dev(cmd->device->host); 935 936 if (dev->cur_cmd) { 937 printk("IMM: bug in imm_queuecommand\n"); 938 return 0; 939 } 940 dev->failed = 0; 941 dev->jstart = jiffies; 942 dev->cur_cmd = cmd; 943 cmd->scsi_done = done; 944 cmd->result = DID_ERROR << 16; /* default return code */ 945 cmd->SCp.phase = 0; /* bus free */ 946 947 schedule_delayed_work(&dev->imm_tq, 0); 948 949 imm_pb_claim(dev); 950 951 return 0; 952 } 953 954 /* 955 * Apparently the disk->capacity attribute is off by 1 sector 956 * for all disk drives. We add the one here, but it should really 957 * be done in sd.c. Even if it gets fixed there, this will still 958 * work. 959 */ 960 static int imm_biosparam(struct scsi_device *sdev, struct block_device *dev, 961 sector_t capacity, int ip[]) 962 { 963 ip[0] = 0x40; 964 ip[1] = 0x20; 965 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); 966 if (ip[2] > 1024) { 967 ip[0] = 0xff; 968 ip[1] = 0x3f; 969 ip[2] = ((unsigned long) capacity + 1) / (ip[0] * ip[1]); 970 } 971 return 0; 972 } 973 974 static int imm_abort(struct scsi_cmnd *cmd) 975 { 976 imm_struct *dev = imm_dev(cmd->device->host); 977 /* 978 * There is no method for aborting commands since Iomega 979 * have tied the SCSI_MESSAGE line high in the interface 980 */ 981 982 switch (cmd->SCp.phase) { 983 case 0: /* Do not have access to parport */ 984 case 1: /* Have not connected to interface */ 985 dev->cur_cmd = NULL; /* Forget the problem */ 986 return SUCCESS; 987 break; 988 default: /* SCSI command sent, can not abort */ 989 return FAILED; 990 break; 991 } 992 } 993 994 static void imm_reset_pulse(unsigned int base) 995 { 996 w_ctr(base, 0x04); 997 w_dtr(base, 0x40); 998 udelay(1); 999 w_ctr(base, 0x0c); 1000 w_ctr(base, 0x0d); 1001 udelay(50); 1002 w_ctr(base, 0x0c); 1003 w_ctr(base, 0x04); 1004 } 1005 1006 static int imm_reset(struct scsi_cmnd *cmd) 1007 { 1008 imm_struct *dev = imm_dev(cmd->device->host); 1009 1010 if (cmd->SCp.phase) 1011 imm_disconnect(dev); 1012 dev->cur_cmd = NULL; /* Forget the problem */ 1013 1014 imm_connect(dev, CONNECT_NORMAL); 1015 imm_reset_pulse(dev->base); 1016 mdelay(1); /* device settle delay */ 1017 imm_disconnect(dev); 1018 mdelay(1); /* device settle delay */ 1019 return SUCCESS; 1020 } 1021 1022 static int device_check(imm_struct *dev) 1023 { 1024 /* This routine looks for a device and then attempts to use EPP 1025 to send a command. If all goes as planned then EPP is available. */ 1026 1027 static char cmd[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 1028 int loop, old_mode, status, k, ppb = dev->base; 1029 unsigned char l; 1030 1031 old_mode = dev->mode; 1032 for (loop = 0; loop < 8; loop++) { 1033 /* Attempt to use EPP for Test Unit Ready */ 1034 if ((ppb & 0x0007) == 0x0000) 1035 dev->mode = IMM_EPP_32; 1036 1037 second_pass: 1038 imm_connect(dev, CONNECT_EPP_MAYBE); 1039 /* Select SCSI device */ 1040 if (!imm_select(dev, loop)) { 1041 imm_disconnect(dev); 1042 continue; 1043 } 1044 printk("imm: Found device at ID %i, Attempting to use %s\n", 1045 loop, IMM_MODE_STRING[dev->mode]); 1046 1047 /* Send SCSI command */ 1048 status = 1; 1049 w_ctr(ppb, 0x0c); 1050 for (l = 0; (l < 3) && (status); l++) 1051 status = imm_out(dev, &cmd[l << 1], 2); 1052 1053 if (!status) { 1054 imm_disconnect(dev); 1055 imm_connect(dev, CONNECT_EPP_MAYBE); 1056 imm_reset_pulse(dev->base); 1057 udelay(1000); 1058 imm_disconnect(dev); 1059 udelay(1000); 1060 if (dev->mode == IMM_EPP_32) { 1061 dev->mode = old_mode; 1062 goto second_pass; 1063 } 1064 printk("imm: Unable to establish communication\n"); 1065 return -EIO; 1066 } 1067 w_ctr(ppb, 0x0c); 1068 1069 k = 1000000; /* 1 Second */ 1070 do { 1071 l = r_str(ppb); 1072 k--; 1073 udelay(1); 1074 } while (!(l & 0x80) && (k)); 1075 1076 l &= 0xb8; 1077 1078 if (l != 0xb8) { 1079 imm_disconnect(dev); 1080 imm_connect(dev, CONNECT_EPP_MAYBE); 1081 imm_reset_pulse(dev->base); 1082 udelay(1000); 1083 imm_disconnect(dev); 1084 udelay(1000); 1085 if (dev->mode == IMM_EPP_32) { 1086 dev->mode = old_mode; 1087 goto second_pass; 1088 } 1089 printk 1090 ("imm: Unable to establish communication\n"); 1091 return -EIO; 1092 } 1093 imm_disconnect(dev); 1094 printk 1095 ("imm: Communication established at 0x%x with ID %i using %s\n", 1096 ppb, loop, IMM_MODE_STRING[dev->mode]); 1097 imm_connect(dev, CONNECT_EPP_MAYBE); 1098 imm_reset_pulse(dev->base); 1099 udelay(1000); 1100 imm_disconnect(dev); 1101 udelay(1000); 1102 return 0; 1103 } 1104 printk("imm: No devices found\n"); 1105 return -ENODEV; 1106 } 1107 1108 /* 1109 * imm cannot deal with highmem, so this causes all IO pages for this host 1110 * to reside in low memory (hence mapped) 1111 */ 1112 static int imm_adjust_queue(struct scsi_device *device) 1113 { 1114 blk_queue_bounce_limit(device->request_queue, BLK_BOUNCE_HIGH); 1115 return 0; 1116 } 1117 1118 static struct scsi_host_template imm_template = { 1119 .module = THIS_MODULE, 1120 .proc_name = "imm", 1121 .proc_info = imm_proc_info, 1122 .name = "Iomega VPI2 (imm) interface", 1123 .queuecommand = imm_queuecommand, 1124 .eh_abort_handler = imm_abort, 1125 .eh_bus_reset_handler = imm_reset, 1126 .eh_host_reset_handler = imm_reset, 1127 .bios_param = imm_biosparam, 1128 .this_id = 7, 1129 .sg_tablesize = SG_ALL, 1130 .cmd_per_lun = 1, 1131 .use_clustering = ENABLE_CLUSTERING, 1132 .can_queue = 1, 1133 .slave_alloc = imm_adjust_queue, 1134 }; 1135 1136 /*************************************************************************** 1137 * Parallel port probing routines * 1138 ***************************************************************************/ 1139 1140 static LIST_HEAD(imm_hosts); 1141 1142 static int __imm_attach(struct parport *pb) 1143 { 1144 struct Scsi_Host *host; 1145 imm_struct *dev; 1146 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waiting); 1147 DEFINE_WAIT(wait); 1148 int ports; 1149 int modes, ppb; 1150 int err = -ENOMEM; 1151 1152 init_waitqueue_head(&waiting); 1153 1154 dev = kzalloc(sizeof(imm_struct), GFP_KERNEL); 1155 if (!dev) 1156 return -ENOMEM; 1157 1158 1159 dev->base = -1; 1160 dev->mode = IMM_AUTODETECT; 1161 INIT_LIST_HEAD(&dev->list); 1162 1163 dev->dev = parport_register_device(pb, "imm", NULL, imm_wakeup, 1164 NULL, 0, dev); 1165 1166 if (!dev->dev) 1167 goto out; 1168 1169 1170 /* Claim the bus so it remembers what we do to the control 1171 * registers. [ CTR and ECP ] 1172 */ 1173 err = -EBUSY; 1174 dev->waiting = &waiting; 1175 prepare_to_wait(&waiting, &wait, TASK_UNINTERRUPTIBLE); 1176 if (imm_pb_claim(dev)) 1177 schedule_timeout(3 * HZ); 1178 if (dev->wanted) { 1179 printk(KERN_ERR "imm%d: failed to claim parport because " 1180 "a pardevice is owning the port for too long " 1181 "time!\n", pb->number); 1182 imm_pb_dismiss(dev); 1183 dev->waiting = NULL; 1184 finish_wait(&waiting, &wait); 1185 goto out1; 1186 } 1187 dev->waiting = NULL; 1188 finish_wait(&waiting, &wait); 1189 ppb = dev->base = dev->dev->port->base; 1190 dev->base_hi = dev->dev->port->base_hi; 1191 w_ctr(ppb, 0x0c); 1192 modes = dev->dev->port->modes; 1193 1194 /* Mode detection works up the chain of speed 1195 * This avoids a nasty if-then-else-if-... tree 1196 */ 1197 dev->mode = IMM_NIBBLE; 1198 1199 if (modes & PARPORT_MODE_TRISTATE) 1200 dev->mode = IMM_PS2; 1201 1202 /* Done configuration */ 1203 1204 err = imm_init(dev); 1205 1206 imm_pb_release(dev); 1207 1208 if (err) 1209 goto out1; 1210 1211 /* now the glue ... */ 1212 if (dev->mode == IMM_NIBBLE || dev->mode == IMM_PS2) 1213 ports = 3; 1214 else 1215 ports = 8; 1216 1217 INIT_DELAYED_WORK(&dev->imm_tq, imm_interrupt); 1218 1219 err = -ENOMEM; 1220 host = scsi_host_alloc(&imm_template, sizeof(imm_struct *)); 1221 if (!host) 1222 goto out1; 1223 host->io_port = pb->base; 1224 host->n_io_port = ports; 1225 host->dma_channel = -1; 1226 host->unique_id = pb->number; 1227 *(imm_struct **)&host->hostdata = dev; 1228 dev->host = host; 1229 list_add_tail(&dev->list, &imm_hosts); 1230 err = scsi_add_host(host, NULL); 1231 if (err) 1232 goto out2; 1233 scsi_scan_host(host); 1234 return 0; 1235 1236 out2: 1237 list_del_init(&dev->list); 1238 scsi_host_put(host); 1239 out1: 1240 parport_unregister_device(dev->dev); 1241 out: 1242 kfree(dev); 1243 return err; 1244 } 1245 1246 static void imm_attach(struct parport *pb) 1247 { 1248 __imm_attach(pb); 1249 } 1250 1251 static void imm_detach(struct parport *pb) 1252 { 1253 imm_struct *dev; 1254 list_for_each_entry(dev, &imm_hosts, list) { 1255 if (dev->dev->port == pb) { 1256 list_del_init(&dev->list); 1257 scsi_remove_host(dev->host); 1258 scsi_host_put(dev->host); 1259 parport_unregister_device(dev->dev); 1260 kfree(dev); 1261 break; 1262 } 1263 } 1264 } 1265 1266 static struct parport_driver imm_driver = { 1267 .name = "imm", 1268 .attach = imm_attach, 1269 .detach = imm_detach, 1270 }; 1271 1272 static int __init imm_driver_init(void) 1273 { 1274 printk("imm: Version %s\n", IMM_VERSION); 1275 return parport_register_driver(&imm_driver); 1276 } 1277 1278 static void __exit imm_driver_exit(void) 1279 { 1280 parport_unregister_driver(&imm_driver); 1281 } 1282 1283 module_init(imm_driver_init); 1284 module_exit(imm_driver_exit); 1285 1286 MODULE_LICENSE("GPL"); 1287