1/* 2 * linux/drivers/ide/cmd640.c Version 1.02 Sep 01, 1996 3 * 4 * Copyright (C) 1995-1996 Linus Torvalds & authors (see below) 5 */ 6 7/* 8 * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov) 9 * mlord@pobox.com (Mark Lord) 10 * 11 * See linux/MAINTAINERS for address of current maintainer. 12 * 13 * This file provides support for the advanced features and bugs 14 * of IDE interfaces using the CMD Technologies 0640 IDE interface chip. 15 * 16 * These chips are basically fucked by design, and getting this driver 17 * to work on every motherboard design that uses this screwed chip seems 18 * bloody well impossible. However, we're still trying. 19 * 20 * Version 0.97 worked for everybody. 21 * 22 * User feedback is essential. Many thanks to the beta test team: 23 * 24 * A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com, 25 * bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz, 26 * chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de, 27 * derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de, 28 * flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net, 29 * j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net, 30 * kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu, 31 * peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com, 32 * s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net, 33 * steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com 34 * liug@mama.indstate.edu, and others. 35 * 36 * Version 0.01 Initial version, hacked out of ide.c, 37 * and #include'd rather than compiled separately. 38 * This will get cleaned up in a subsequent release. 39 * 40 * Version 0.02 Fixes for vlb initialization code, enable prefetch 41 * for versions 'B' and 'C' of chip by default, 42 * some code cleanup. 43 * 44 * Version 0.03 Added reset of secondary interface, 45 * and black list for devices which are not compatible 46 * with prefetch mode. Separate function for setting 47 * prefetch is added, possibly it will be called some 48 * day from ioctl processing code. 49 * 50 * Version 0.04 Now configs/compiles separate from ide.c 51 * 52 * Version 0.05 Major rewrite of interface timing code. 53 * Added new function cmd640_set_mode to set PIO mode 54 * from ioctl call. New drives added to black list. 55 * 56 * Version 0.06 More code cleanup. Prefetch is enabled only for 57 * detected hard drives, not included in prefetch 58 * black list. 59 * 60 * Version 0.07 Changed to more conservative drive tuning policy. 61 * Unknown drives, which report PIO < 4 are set to 62 * (reported_PIO - 1) if it is supported, or to PIO0. 63 * List of known drives extended by info provided by 64 * CMD at their ftp site. 65 * 66 * Version 0.08 Added autotune/noautotune support. 67 * 68 * Version 0.09 Try to be smarter about 2nd port enabling. 69 * Version 0.10 Be nice and don't reset 2nd port. 70 * Version 0.11 Try to handle more weird situations. 71 * 72 * Version 0.12 Lots of bug fixes from Laszlo Peter 73 * irq unmasking disabled for reliability. 74 * try to be even smarter about the second port. 75 * tidy up source code formatting. 76 * Version 0.13 permit irq unmasking again. 77 * Version 0.90 massive code cleanup, some bugs fixed. 78 * defaults all drives to PIO mode0, prefetch off. 79 * autotune is OFF by default, with compile time flag. 80 * prefetch can be turned OFF/ON using "hdparm -p8/-p9" 81 * (requires hdparm-3.1 or newer) 82 * Version 0.91 first release to linux-kernel list. 83 * Version 0.92 move initial reg dump to separate callable function 84 * change "readahead" to "prefetch" to avoid confusion 85 * Version 0.95 respect original BIOS timings unless autotuning. 86 * tons of code cleanup and rearrangement. 87 * added CONFIG_BLK_DEV_CMD640_ENHANCED option 88 * prevent use of unmask when prefetch is on 89 * Version 0.96 prevent use of io_32bit when prefetch is off 90 * Version 0.97 fix VLB secondary interface for sjd@slip.net 91 * other minor tune-ups: 0.96 was very good. 92 * Version 0.98 ignore PCI version when disabled by BIOS 93 * Version 0.99 display setup/active/recovery clocks with PIO mode 94 * Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems 95 * Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7" 96 * ("fast" is necessary for 32bit I/O in some systems) 97 * Version 1.02 fix bug that resulted in slow "setup times" 98 * (patch courtesy of Zoltan Hidvegi) 99 */ 100 101#undef REALLY_SLOW_IO /* most systems can safely undef this */ 102#define CMD640_PREFETCH_MASKS 1 103 104#include <linux/config.h> 105#include <linux/types.h> 106#include <linux/kernel.h> 107#include <linux/delay.h> 108#include <linux/timer.h> 109#include <linux/mm.h> 110#include <linux/ioport.h> 111#include <linux/blkdev.h> 112#include <linux/hdreg.h> 113#include <linux/ide.h> 114#include <linux/init.h> 115 116#include <asm/io.h> 117 118#include "ide_modes.h" 119 120/* 121 * This flag is set in ide.c by the parameter: ide0=cmd640_vlb 122 */ 123int cmd640_vlb = 0; 124 125/* 126 * CMD640 specific registers definition. 127 */ 128 129#define VID 0x00 130#define DID 0x02 131#define PCMD 0x04 132#define PCMD_ENA 0x01 133#define PSTTS 0x06 134#define REVID 0x08 135#define PROGIF 0x09 136#define SUBCL 0x0a 137#define BASCL 0x0b 138#define BaseA0 0x10 139#define BaseA1 0x14 140#define BaseA2 0x18 141#define BaseA3 0x1c 142#define INTLINE 0x3c 143#define INPINE 0x3d 144 145#define CFR 0x50 146#define CFR_DEVREV 0x03 147#define CFR_IDE01INTR 0x04 148#define CFR_DEVID 0x18 149#define CFR_AT_VESA_078h 0x20 150#define CFR_DSA1 0x40 151#define CFR_DSA0 0x80 152 153#define CNTRL 0x51 154#define CNTRL_DIS_RA0 0x40 155#define CNTRL_DIS_RA1 0x80 156#define CNTRL_ENA_2ND 0x08 157 158#define CMDTIM 0x52 159#define ARTTIM0 0x53 160#define DRWTIM0 0x54 161#define ARTTIM1 0x55 162#define DRWTIM1 0x56 163#define ARTTIM23 0x57 164#define ARTTIM23_DIS_RA2 0x04 165#define ARTTIM23_DIS_RA3 0x08 166#define DRWTIM23 0x58 167#define BRST 0x59 168 169/* 170 * Registers and masks for easy access by drive index: 171 */ 172static byte prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23}; 173static byte prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3}; 174 175#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 176 177static byte arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23}; 178static byte drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23}; 179 180/* 181 * Current cmd640 timing values for each drive. 182 * The defaults for each are the slowest possible timings. 183 */ 184static byte setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */ 185static byte active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */ 186static byte recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */ 187 188#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 189 190/* 191 * These are initialized to point at the devices we control 192 */ 193static ide_hwif_t *cmd_hwif0, *cmd_hwif1; 194static ide_drive_t *cmd_drives[4]; 195 196/* 197 * Interface to access cmd640x registers 198 */ 199static unsigned int cmd640_key; 200static void (*put_cmd640_reg)(unsigned short reg, byte val); 201static byte (*get_cmd640_reg)(unsigned short reg); 202 203/* 204 * This is read from the CFR reg, and is used in several places. 205 */ 206static unsigned int cmd640_chip_version; 207 208/* 209 * The CMD640x chip does not support DWORD config write cycles, but some 210 * of the BIOSes use them to implement the config services. 211 * Therefore, we must use direct IO instead. 212 */ 213 214/* PCI method 1 access */ 215 216static void put_cmd640_reg_pci1 (unsigned short reg, byte val) 217{ 218 unsigned long flags; 219 220 save_flags(flags); 221 cli(); 222 outl_p((reg & 0xfc) | cmd640_key, 0xcf8); 223 outb_p(val, (reg & 3) | 0xcfc); 224 restore_flags(flags); 225} 226 227static byte get_cmd640_reg_pci1 (unsigned short reg) 228{ 229 byte b; 230 unsigned long flags; 231 232 save_flags(flags); 233 cli(); 234 outl_p((reg & 0xfc) | cmd640_key, 0xcf8); 235 b = inb_p((reg & 3) | 0xcfc); 236 restore_flags(flags); 237 return b; 238} 239 240/* PCI method 2 access (from CMD datasheet) */ 241 242static void put_cmd640_reg_pci2 (unsigned short reg, byte val) 243{ 244 unsigned long flags; 245 246 save_flags(flags); 247 cli(); 248 outb_p(0x10, 0xcf8); 249 outb_p(val, cmd640_key + reg); 250 outb_p(0, 0xcf8); 251 restore_flags(flags); 252} 253 254static byte get_cmd640_reg_pci2 (unsigned short reg) 255{ 256 byte b; 257 unsigned long flags; 258 259 save_flags(flags); 260 cli(); 261 outb_p(0x10, 0xcf8); 262 b = inb_p(cmd640_key + reg); 263 outb_p(0, 0xcf8); 264 restore_flags(flags); 265 return b; 266} 267 268/* VLB access */ 269 270static void put_cmd640_reg_vlb (unsigned short reg, byte val) 271{ 272 unsigned long flags; 273 274 save_flags(flags); 275 cli(); 276 outb_p(reg, cmd640_key); 277 outb_p(val, cmd640_key + 4); 278 restore_flags(flags); 279} 280 281static byte get_cmd640_reg_vlb (unsigned short reg) 282{ 283 byte b; 284 unsigned long flags; 285 286 save_flags(flags); 287 cli(); 288 outb_p(reg, cmd640_key); 289 b = inb_p(cmd640_key + 4); 290 restore_flags(flags); 291 return b; 292} 293 294static int __init match_pci_cmd640_device (void) 295{ 296 const byte ven_dev[4] = {0x95, 0x10, 0x40, 0x06}; 297 unsigned int i; 298 for (i = 0; i < 4; i++) { 299 if (get_cmd640_reg(i) != ven_dev[i]) 300 return 0; 301 } 302#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT 303 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) { 304 printk("ide: cmd640 on PCI disabled by BIOS\n"); 305 return 0; 306 } 307#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */ 308 return 1; /* success */ 309} 310 311/* 312 * Probe for CMD640x -- pci method 1 313 */ 314static int __init probe_for_cmd640_pci1 (void) 315{ 316 get_cmd640_reg = get_cmd640_reg_pci1; 317 put_cmd640_reg = put_cmd640_reg_pci1; 318 for (cmd640_key = 0x80000000; cmd640_key <= 0x8000f800; cmd640_key += 0x800) { 319 if (match_pci_cmd640_device()) 320 return 1; /* success */ 321 } 322 return 0; 323} 324 325/* 326 * Probe for CMD640x -- pci method 2 327 */ 328static int __init probe_for_cmd640_pci2 (void) 329{ 330 get_cmd640_reg = get_cmd640_reg_pci2; 331 put_cmd640_reg = put_cmd640_reg_pci2; 332 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) { 333 if (match_pci_cmd640_device()) 334 return 1; /* success */ 335 } 336 return 0; 337} 338 339/* 340 * Probe for CMD640x -- vlb 341 */ 342static int __init probe_for_cmd640_vlb (void) 343{ 344 byte b; 345 346 get_cmd640_reg = get_cmd640_reg_vlb; 347 put_cmd640_reg = put_cmd640_reg_vlb; 348 cmd640_key = 0x178; 349 b = get_cmd640_reg(CFR); 350 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) { 351 cmd640_key = 0x78; 352 b = get_cmd640_reg(CFR); 353 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h)) 354 return 0; 355 } 356 return 1; /* success */ 357} 358 359/* 360 * Returns 1 if an IDE interface/drive exists at 0x170, 361 * Returns 0 otherwise. 362 */ 363static int __init secondary_port_responding (void) 364{ 365 unsigned long flags; 366 367 save_flags(flags); 368 cli(); 369 370 outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */ 371 udelay(100); 372 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) { 373 outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */ 374 udelay(100); 375 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) { 376 restore_flags(flags); 377 return 0; /* nothing responded */ 378 } 379 } 380 restore_flags(flags); 381 return 1; /* success */ 382} 383 384#ifdef CMD640_DUMP_REGS 385/* 386 * Dump out all cmd640 registers. May be called from ide.c 387 */ 388void cmd640_dump_regs (void) 389{ 390 unsigned int reg = cmd640_vlb ? 0x50 : 0x00; 391 392 /* Dump current state of chip registers */ 393 printk("ide: cmd640 internal register dump:"); 394 for (; reg <= 0x59; reg++) { 395 if (!(reg & 0x0f)) 396 printk("\n%04x:", reg); 397 printk(" %02x", get_cmd640_reg(reg)); 398 } 399 printk("\n"); 400} 401#endif 402 403/* 404 * Check whether prefetch is on for a drive, 405 * and initialize the unmask flags for safe operation. 406 */ 407static void __init check_prefetch (unsigned int index) 408{ 409 ide_drive_t *drive = cmd_drives[index]; 410 byte b = get_cmd640_reg(prefetch_regs[index]); 411 412 if (b & prefetch_masks[index]) { /* is prefetch off? */ 413 drive->no_unmask = 0; 414 drive->no_io_32bit = 1; 415 drive->io_32bit = 0; 416 } else { 417#if CMD640_PREFETCH_MASKS 418 drive->no_unmask = 1; 419 drive->unmask = 0; 420#endif 421 drive->no_io_32bit = 0; 422 } 423} 424 425/* 426 * Figure out which devices we control 427 */ 428static void __init setup_device_ptrs (void) 429{ 430 unsigned int i; 431 432 cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */ 433 cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */ 434 for (i = 0; i < MAX_HWIFS; i++) { 435 ide_hwif_t *hwif = &ide_hwifs[i]; 436 if (hwif->chipset == ide_unknown || hwif->chipset == ide_generic) { 437 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0) 438 cmd_hwif0 = hwif; 439 else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170) 440 cmd_hwif1 = hwif; 441 } 442 } 443 cmd_drives[0] = &cmd_hwif0->drives[0]; 444 cmd_drives[1] = &cmd_hwif0->drives[1]; 445 cmd_drives[2] = &cmd_hwif1->drives[0]; 446 cmd_drives[3] = &cmd_hwif1->drives[1]; 447} 448 449#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 450 451/* 452 * Sets prefetch mode for a drive. 453 */ 454static void set_prefetch_mode (unsigned int index, int mode) 455{ 456 ide_drive_t *drive = cmd_drives[index]; 457 int reg = prefetch_regs[index]; 458 byte b; 459 unsigned long flags; 460 461 save_flags(flags); 462 cli(); 463 b = get_cmd640_reg(reg); 464 if (mode) { /* want prefetch on? */ 465#if CMD640_PREFETCH_MASKS 466 drive->no_unmask = 1; 467 drive->unmask = 0; 468#endif 469 drive->no_io_32bit = 0; 470 b &= ~prefetch_masks[index]; /* enable prefetch */ 471 } else { 472 drive->no_unmask = 0; 473 drive->no_io_32bit = 1; 474 drive->io_32bit = 0; 475 b |= prefetch_masks[index]; /* disable prefetch */ 476 } 477 put_cmd640_reg(reg, b); 478 restore_flags(flags); 479} 480 481/* 482 * Dump out current drive clocks settings 483 */ 484static void display_clocks (unsigned int index) 485{ 486 byte active_count, recovery_count; 487 488 active_count = active_counts[index]; 489 if (active_count == 1) 490 ++active_count; 491 recovery_count = recovery_counts[index]; 492 if (active_count > 3 && recovery_count == 1) 493 ++recovery_count; 494 if (cmd640_chip_version > 1) 495 recovery_count += 1; /* cmd640b uses (count + 1)*/ 496 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count); 497} 498 499/* 500 * Pack active and recovery counts into single byte representation 501 * used by controller 502 */ 503inline static byte pack_nibbles (byte upper, byte lower) 504{ 505 return ((upper & 0x0f) << 4) | (lower & 0x0f); 506} 507 508/* 509 * This routine retrieves the initial drive timings from the chipset. 510 */ 511static void __init retrieve_drive_counts (unsigned int index) 512{ 513 byte b; 514 515 /* 516 * Get the internal setup timing, and convert to clock count 517 */ 518 b = get_cmd640_reg(arttim_regs[index]) & ~0x3f; 519 switch (b) { 520 case 0x00: b = 4; break; 521 case 0x80: b = 3; break; 522 case 0x40: b = 2; break; 523 default: b = 5; break; 524 } 525 setup_counts[index] = b; 526 527 /* 528 * Get the active/recovery counts 529 */ 530 b = get_cmd640_reg(drwtim_regs[index]); 531 active_counts[index] = (b >> 4) ? (b >> 4) : 0x10; 532 recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10; 533} 534 535 536/* 537 * This routine writes the prepared setup/active/recovery counts 538 * for a drive into the cmd640 chipset registers to active them. 539 */ 540static void program_drive_counts (unsigned int index) 541{ 542 unsigned long flags; 543 byte setup_count = setup_counts[index]; 544 byte active_count = active_counts[index]; 545 byte recovery_count = recovery_counts[index]; 546 547 /* 548 * Set up address setup count and drive read/write timing registers. 549 * Primary interface has individual count/timing registers for 550 * each drive. Secondary interface has one common set of registers, 551 * so we merge the timings, using the slowest value for each timing. 552 */ 553 if (index > 1) { 554 unsigned int mate; 555 if (cmd_drives[mate = index ^ 1]->present) { 556 if (setup_count < setup_counts[mate]) 557 setup_count = setup_counts[mate]; 558 if (active_count < active_counts[mate]) 559 active_count = active_counts[mate]; 560 if (recovery_count < recovery_counts[mate]) 561 recovery_count = recovery_counts[mate]; 562 } 563 } 564 565 /* 566 * Convert setup_count to internal chipset representation 567 */ 568 switch (setup_count) { 569 case 4: setup_count = 0x00; break; 570 case 3: setup_count = 0x80; break; 571 case 1: 572 case 2: setup_count = 0x40; break; 573 default: setup_count = 0xc0; /* case 5 */ 574 } 575 576 /* 577 * Now that everything is ready, program the new timings 578 */ 579 save_flags (flags); 580 cli(); 581 /* 582 * Program the address_setup clocks into ARTTIM reg, 583 * and then the active/recovery counts into the DRWTIM reg 584 * (this converts counts of 16 into counts of zero -- okay). 585 */ 586 setup_count |= get_cmd640_reg(arttim_regs[index]) & 0x3f; 587 put_cmd640_reg(arttim_regs[index], setup_count); 588 put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count)); 589 restore_flags(flags); 590} 591 592/* 593 * Set a specific pio_mode for a drive 594 */ 595static void cmd640_set_mode (unsigned int index, byte pio_mode, unsigned int cycle_time) 596{ 597 int setup_time, active_time, recovery_time, clock_time; 598 byte setup_count, active_count, recovery_count, recovery_count2, cycle_count; 599 int bus_speed = system_bus_clock(); 600 601 if (pio_mode > 5) 602 pio_mode = 5; 603 setup_time = ide_pio_timings[pio_mode].setup_time; 604 active_time = ide_pio_timings[pio_mode].active_time; 605 recovery_time = cycle_time - (setup_time + active_time); 606 clock_time = 1000 / bus_speed; 607 cycle_count = (cycle_time + clock_time - 1) / clock_time; 608 609 setup_count = (setup_time + clock_time - 1) / clock_time; 610 611 active_count = (active_time + clock_time - 1) / clock_time; 612 if (active_count < 2) 613 active_count = 2; /* minimum allowed by cmd640 */ 614 615 recovery_count = (recovery_time + clock_time - 1) / clock_time; 616 recovery_count2 = cycle_count - (setup_count + active_count); 617 if (recovery_count2 > recovery_count) 618 recovery_count = recovery_count2; 619 if (recovery_count < 2) 620 recovery_count = 2; /* minimum allowed by cmd640 */ 621 if (recovery_count > 17) { 622 active_count += recovery_count - 17; 623 recovery_count = 17; 624 } 625 if (active_count > 16) 626 active_count = 16; /* maximum allowed by cmd640 */ 627 if (cmd640_chip_version > 1) 628 recovery_count -= 1; /* cmd640b uses (count + 1)*/ 629 if (recovery_count > 16) 630 recovery_count = 16; /* maximum allowed by cmd640 */ 631 632 setup_counts[index] = setup_count; 633 active_counts[index] = active_count; 634 recovery_counts[index] = recovery_count; 635 636 /* 637 * In a perfect world, we might set the drive pio mode here 638 * (using WIN_SETFEATURE) before continuing. 639 * 640 * But we do not, because: 641 * 1) this is the wrong place to do it (proper is do_special() in ide.c) 642 * 2) in practice this is rarely, if ever, necessary 643 */ 644 program_drive_counts (index); 645} 646 647/* 648 * Drive PIO mode selection: 649 */ 650static void cmd640_tune_drive (ide_drive_t *drive, byte mode_wanted) 651{ 652 byte b; 653 ide_pio_data_t d; 654 unsigned int index = 0; 655 656 while (drive != cmd_drives[index]) { 657 if (++index > 3) { 658 printk("%s: bad news in cmd640_tune_drive\n", drive->name); 659 return; 660 } 661 } 662 switch (mode_wanted) { 663 case 6: /* set fast-devsel off */ 664 case 7: /* set fast-devsel on */ 665 mode_wanted &= 1; 666 b = get_cmd640_reg(CNTRL) & ~0x27; 667 if (mode_wanted) 668 b |= 0x27; 669 put_cmd640_reg(CNTRL, b); 670 printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis"); 671 return; 672 673 case 8: /* set prefetch off */ 674 case 9: /* set prefetch on */ 675 mode_wanted &= 1; 676 set_prefetch_mode(index, mode_wanted); 677 printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis"); 678 return; 679 } 680 681 (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d); 682 cmd640_set_mode (index, d.pio_mode, d.cycle_time); 683 684 printk ("%s: selected cmd640 PIO mode%d (%dns)%s", 685 drive->name, 686 d.pio_mode, 687 d.cycle_time, 688 d.overridden ? " (overriding vendor mode)" : ""); 689 display_clocks(index); 690 return; 691} 692 693#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 694 695/* 696 * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c 697 */ 698int __init ide_probe_for_cmd640x (void) 699{ 700#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 701 int second_port_toggled = 0; 702#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 703 int second_port_cmd640 = 0; 704 const char *bus_type, *port2; 705 unsigned int index; 706 byte b, cfr; 707 708 if (cmd640_vlb && probe_for_cmd640_vlb()) { 709 bus_type = "VLB"; 710 } else { 711 cmd640_vlb = 0; 712 if (probe_for_cmd640_pci1()) 713 bus_type = "PCI (type1)"; 714 else if (probe_for_cmd640_pci2()) 715 bus_type = "PCI (type2)"; 716 else 717 return 0; 718 } 719 /* 720 * Undocumented magic (there is no 0x5b reg in specs) 721 */ 722 put_cmd640_reg(0x5b, 0xbd); 723 if (get_cmd640_reg(0x5b) != 0xbd) { 724 printk("ide: cmd640 init failed: wrong value in reg 0x5b\n"); 725 return 0; 726 } 727 put_cmd640_reg(0x5b, 0); 728 729#ifdef CMD640_DUMP_REGS 730 CMD640_DUMP_REGS; 731#endif 732 733 /* 734 * Documented magic begins here 735 */ 736 cfr = get_cmd640_reg(CFR); 737 cmd640_chip_version = cfr & CFR_DEVREV; 738 if (cmd640_chip_version == 0) { 739 printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version); 740 return 0; 741 } 742 743 /* 744 * Initialize data for primary port 745 */ 746 setup_device_ptrs (); 747 printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n", 748 cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr); 749 cmd_hwif0->chipset = ide_cmd640; 750#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 751 cmd_hwif0->tuneproc = &cmd640_tune_drive; 752#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 753 754 /* 755 * Ensure compatibility by always using the slowest timings 756 * for access to the drive's command register block, 757 * and reset the prefetch burstsize to default (512 bytes). 758 * 759 * Maybe we need a way to NOT do these on *some* systems? 760 */ 761 put_cmd640_reg(CMDTIM, 0); 762 put_cmd640_reg(BRST, 0x40); 763 764 /* 765 * Try to enable the secondary interface, if not already enabled 766 */ 767 if (cmd_hwif1->noprobe) { 768 port2 = "not probed"; 769 } else { 770 b = get_cmd640_reg(CNTRL); 771 if (secondary_port_responding()) { 772 if ((b & CNTRL_ENA_2ND)) { 773 second_port_cmd640 = 1; 774 port2 = "okay"; 775 } else if (cmd640_vlb) { 776 second_port_cmd640 = 1; 777 port2 = "alive"; 778 } else 779 port2 = "not cmd640"; 780 } else { 781 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */ 782 if (secondary_port_responding()) { 783 second_port_cmd640 = 1; 784#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 785 second_port_toggled = 1; 786#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 787 port2 = "enabled"; 788 } else { 789 put_cmd640_reg(CNTRL, b); /* restore original setting */ 790 port2 = "not responding"; 791 } 792 } 793 } 794 795 /* 796 * Initialize data for secondary cmd640 port, if enabled 797 */ 798 if (second_port_cmd640) { 799 cmd_hwif0->serialized = 1; 800 cmd_hwif1->serialized = 1; 801 cmd_hwif1->chipset = ide_cmd640; 802 cmd_hwif0->mate = cmd_hwif1; 803 cmd_hwif1->mate = cmd_hwif0; 804 cmd_hwif1->channel = 1; 805#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 806 cmd_hwif1->tuneproc = &cmd640_tune_drive; 807#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 808 } 809 printk("%s: %sserialized, secondary interface %s\n", cmd_hwif1->name, 810 cmd_hwif0->serialized ? "" : "not ", port2); 811 812 /* 813 * Establish initial timings/prefetch for all drives. 814 * Do not unnecessarily disturb any prior BIOS setup of these. 815 */ 816 for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) { 817 ide_drive_t *drive = cmd_drives[index]; 818#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 819 if (drive->autotune || ((index > 1) && second_port_toggled)) { 820 /* 821 * Reset timing to the slowest speed and turn off prefetch. 822 * This way, the drive identify code has a better chance. 823 */ 824 setup_counts [index] = 4; /* max possible */ 825 active_counts [index] = 16; /* max possible */ 826 recovery_counts [index] = 16; /* max possible */ 827 program_drive_counts (index); 828 set_prefetch_mode (index, 0); 829 printk("cmd640: drive%d timings/prefetch cleared\n", index); 830 } else { 831 /* 832 * Record timings/prefetch without changing them. 833 * This preserves any prior BIOS setup. 834 */ 835 retrieve_drive_counts (index); 836 check_prefetch (index); 837 printk("cmd640: drive%d timings/prefetch(%s) preserved", 838 index, drive->no_io_32bit ? "off" : "on"); 839 display_clocks(index); 840 } 841#else 842 /* 843 * Set the drive unmask flags to match the prefetch setting 844 */ 845 check_prefetch (index); 846 printk("cmd640: drive%d timings/prefetch(%s) preserved\n", 847 index, drive->no_io_32bit ? "off" : "on"); 848#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 849 } 850 851#ifdef CMD640_DUMP_REGS 852 CMD640_DUMP_REGS; 853#endif 854 return 1; 855} 856 857