1/* 2 * linux/drivers/ide/pci/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#define CMD640_PREFETCH_MASKS 1 102 103//#define CMD640_DUMP_REGS 104 105#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/* 119 * This flag is set in ide.c by the parameter: ide0=cmd640_vlb 120 */ 121int cmd640_vlb = 0; 122 123/* 124 * CMD640 specific registers definition. 125 */ 126 127#define VID 0x00 128#define DID 0x02 129#define PCMD 0x04 130#define PCMD_ENA 0x01 131#define PSTTS 0x06 132#define REVID 0x08 133#define PROGIF 0x09 134#define SUBCL 0x0a 135#define BASCL 0x0b 136#define BaseA0 0x10 137#define BaseA1 0x14 138#define BaseA2 0x18 139#define BaseA3 0x1c 140#define INTLINE 0x3c 141#define INPINE 0x3d 142 143#define CFR 0x50 144#define CFR_DEVREV 0x03 145#define CFR_IDE01INTR 0x04 146#define CFR_DEVID 0x18 147#define CFR_AT_VESA_078h 0x20 148#define CFR_DSA1 0x40 149#define CFR_DSA0 0x80 150 151#define CNTRL 0x51 152#define CNTRL_DIS_RA0 0x40 153#define CNTRL_DIS_RA1 0x80 154#define CNTRL_ENA_2ND 0x08 155 156#define CMDTIM 0x52 157#define ARTTIM0 0x53 158#define DRWTIM0 0x54 159#define ARTTIM1 0x55 160#define DRWTIM1 0x56 161#define ARTTIM23 0x57 162#define ARTTIM23_DIS_RA2 0x04 163#define ARTTIM23_DIS_RA3 0x08 164#define DRWTIM23 0x58 165#define BRST 0x59 166 167/* 168 * Registers and masks for easy access by drive index: 169 */ 170static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23}; 171static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3}; 172 173#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 174 175static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23}; 176static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23}; 177 178/* 179 * Current cmd640 timing values for each drive. 180 * The defaults for each are the slowest possible timings. 181 */ 182static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */ 183static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */ 184static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */ 185 186#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 187 188/* 189 * These are initialized to point at the devices we control 190 */ 191static ide_hwif_t *cmd_hwif0, *cmd_hwif1; 192static ide_drive_t *cmd_drives[4]; 193 194/* 195 * Interface to access cmd640x registers 196 */ 197static unsigned int cmd640_key; 198static void (*__put_cmd640_reg)(u16 reg, u8 val); 199static u8 (*__get_cmd640_reg)(u16 reg); 200 201/* 202 * This is read from the CFR reg, and is used in several places. 203 */ 204static unsigned int cmd640_chip_version; 205 206/* 207 * The CMD640x chip does not support DWORD config write cycles, but some 208 * of the BIOSes use them to implement the config services. 209 * Therefore, we must use direct IO instead. 210 */ 211 212/* PCI method 1 access */ 213 214static void put_cmd640_reg_pci1 (u16 reg, u8 val) 215{ 216 outl_p((reg & 0xfc) | cmd640_key, 0xcf8); 217 outb_p(val, (reg & 3) | 0xcfc); 218} 219 220static u8 get_cmd640_reg_pci1 (u16 reg) 221{ 222 outl_p((reg & 0xfc) | cmd640_key, 0xcf8); 223 return inb_p((reg & 3) | 0xcfc); 224} 225 226/* PCI method 2 access (from CMD datasheet) */ 227 228static void put_cmd640_reg_pci2 (u16 reg, u8 val) 229{ 230 outb_p(0x10, 0xcf8); 231 outb_p(val, cmd640_key + reg); 232 outb_p(0, 0xcf8); 233} 234 235static u8 get_cmd640_reg_pci2 (u16 reg) 236{ 237 u8 b; 238 239 outb_p(0x10, 0xcf8); 240 b = inb_p(cmd640_key + reg); 241 outb_p(0, 0xcf8); 242 return b; 243} 244 245/* VLB access */ 246 247static void put_cmd640_reg_vlb (u16 reg, u8 val) 248{ 249 outb_p(reg, cmd640_key); 250 outb_p(val, cmd640_key + 4); 251} 252 253static u8 get_cmd640_reg_vlb (u16 reg) 254{ 255 outb_p(reg, cmd640_key); 256 return inb_p(cmd640_key + 4); 257} 258 259static u8 get_cmd640_reg(u16 reg) 260{ 261 u8 b; 262 unsigned long flags; 263 264 spin_lock_irqsave(&ide_lock, flags); 265 b = __get_cmd640_reg(reg); 266 spin_unlock_irqrestore(&ide_lock, flags); 267 return b; 268} 269 270static void put_cmd640_reg(u16 reg, u8 val) 271{ 272 unsigned long flags; 273 274 spin_lock_irqsave(&ide_lock, flags); 275 __put_cmd640_reg(reg,val); 276 spin_unlock_irqrestore(&ide_lock, flags); 277} 278 279static int __init match_pci_cmd640_device (void) 280{ 281 const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06}; 282 unsigned int i; 283 for (i = 0; i < 4; i++) { 284 if (get_cmd640_reg(i) != ven_dev[i]) 285 return 0; 286 } 287#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT 288 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) { 289 printk("ide: cmd640 on PCI disabled by BIOS\n"); 290 return 0; 291 } 292#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */ 293 return 1; /* success */ 294} 295 296/* 297 * Probe for CMD640x -- pci method 1 298 */ 299static int __init probe_for_cmd640_pci1 (void) 300{ 301 __get_cmd640_reg = get_cmd640_reg_pci1; 302 __put_cmd640_reg = put_cmd640_reg_pci1; 303 for (cmd640_key = 0x80000000; 304 cmd640_key <= 0x8000f800; 305 cmd640_key += 0x800) { 306 if (match_pci_cmd640_device()) 307 return 1; /* success */ 308 } 309 return 0; 310} 311 312/* 313 * Probe for CMD640x -- pci method 2 314 */ 315static int __init probe_for_cmd640_pci2 (void) 316{ 317 __get_cmd640_reg = get_cmd640_reg_pci2; 318 __put_cmd640_reg = put_cmd640_reg_pci2; 319 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) { 320 if (match_pci_cmd640_device()) 321 return 1; /* success */ 322 } 323 return 0; 324} 325 326/* 327 * Probe for CMD640x -- vlb 328 */ 329static int __init probe_for_cmd640_vlb (void) 330{ 331 u8 b; 332 333 __get_cmd640_reg = get_cmd640_reg_vlb; 334 __put_cmd640_reg = put_cmd640_reg_vlb; 335 cmd640_key = 0x178; 336 b = get_cmd640_reg(CFR); 337 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) { 338 cmd640_key = 0x78; 339 b = get_cmd640_reg(CFR); 340 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h)) 341 return 0; 342 } 343 return 1; /* success */ 344} 345 346/* 347 * Returns 1 if an IDE interface/drive exists at 0x170, 348 * Returns 0 otherwise. 349 */ 350static int __init secondary_port_responding (void) 351{ 352 unsigned long flags; 353 354 spin_lock_irqsave(&ide_lock, flags); 355 356 outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */ 357 udelay(100); 358 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) { 359 outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */ 360 udelay(100); 361 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) { 362 spin_unlock_irqrestore(&ide_lock, flags); 363 return 0; /* nothing responded */ 364 } 365 } 366 spin_unlock_irqrestore(&ide_lock, flags); 367 return 1; /* success */ 368} 369 370#ifdef CMD640_DUMP_REGS 371/* 372 * Dump out all cmd640 registers. May be called from ide.c 373 */ 374static void cmd640_dump_regs (void) 375{ 376 unsigned int reg = cmd640_vlb ? 0x50 : 0x00; 377 378 /* Dump current state of chip registers */ 379 printk("ide: cmd640 internal register dump:"); 380 for (; reg <= 0x59; reg++) { 381 if (!(reg & 0x0f)) 382 printk("\n%04x:", reg); 383 printk(" %02x", get_cmd640_reg(reg)); 384 } 385 printk("\n"); 386} 387#endif 388 389/* 390 * Check whether prefetch is on for a drive, 391 * and initialize the unmask flags for safe operation. 392 */ 393static void __init check_prefetch (unsigned int index) 394{ 395 ide_drive_t *drive = cmd_drives[index]; 396 u8 b = get_cmd640_reg(prefetch_regs[index]); 397 398 if (b & prefetch_masks[index]) { /* is prefetch off? */ 399 drive->no_unmask = 0; 400 drive->no_io_32bit = 1; 401 drive->io_32bit = 0; 402 } else { 403#if CMD640_PREFETCH_MASKS 404 drive->no_unmask = 1; 405 drive->unmask = 0; 406#endif 407 drive->no_io_32bit = 0; 408 } 409} 410 411/* 412 * Figure out which devices we control 413 */ 414static void __init setup_device_ptrs (void) 415{ 416 unsigned int i; 417 418 cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */ 419 cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */ 420 for (i = 0; i < MAX_HWIFS; i++) { 421 ide_hwif_t *hwif = &ide_hwifs[i]; 422 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) { 423 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0) 424 cmd_hwif0 = hwif; 425 else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170) 426 cmd_hwif1 = hwif; 427 } 428 } 429 cmd_drives[0] = &cmd_hwif0->drives[0]; 430 cmd_drives[1] = &cmd_hwif0->drives[1]; 431 cmd_drives[2] = &cmd_hwif1->drives[0]; 432 cmd_drives[3] = &cmd_hwif1->drives[1]; 433} 434 435#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 436 437/* 438 * Sets prefetch mode for a drive. 439 */ 440static void set_prefetch_mode (unsigned int index, int mode) 441{ 442 ide_drive_t *drive = cmd_drives[index]; 443 int reg = prefetch_regs[index]; 444 u8 b; 445 unsigned long flags; 446 447 spin_lock_irqsave(&ide_lock, flags); 448 b = __get_cmd640_reg(reg); 449 if (mode) { /* want prefetch on? */ 450#if CMD640_PREFETCH_MASKS 451 drive->no_unmask = 1; 452 drive->unmask = 0; 453#endif 454 drive->no_io_32bit = 0; 455 b &= ~prefetch_masks[index]; /* enable prefetch */ 456 } else { 457 drive->no_unmask = 0; 458 drive->no_io_32bit = 1; 459 drive->io_32bit = 0; 460 b |= prefetch_masks[index]; /* disable prefetch */ 461 } 462 __put_cmd640_reg(reg, b); 463 spin_unlock_irqrestore(&ide_lock, flags); 464} 465 466/* 467 * Dump out current drive clocks settings 468 */ 469static void display_clocks (unsigned int index) 470{ 471 u8 active_count, recovery_count; 472 473 active_count = active_counts[index]; 474 if (active_count == 1) 475 ++active_count; 476 recovery_count = recovery_counts[index]; 477 if (active_count > 3 && recovery_count == 1) 478 ++recovery_count; 479 if (cmd640_chip_version > 1) 480 recovery_count += 1; /* cmd640b uses (count + 1)*/ 481 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count); 482} 483 484/* 485 * Pack active and recovery counts into single byte representation 486 * used by controller 487 */ 488static inline u8 pack_nibbles (u8 upper, u8 lower) 489{ 490 return ((upper & 0x0f) << 4) | (lower & 0x0f); 491} 492 493/* 494 * This routine retrieves the initial drive timings from the chipset. 495 */ 496static void __init retrieve_drive_counts (unsigned int index) 497{ 498 u8 b; 499 500 /* 501 * Get the internal setup timing, and convert to clock count 502 */ 503 b = get_cmd640_reg(arttim_regs[index]) & ~0x3f; 504 switch (b) { 505 case 0x00: b = 4; break; 506 case 0x80: b = 3; break; 507 case 0x40: b = 2; break; 508 default: b = 5; break; 509 } 510 setup_counts[index] = b; 511 512 /* 513 * Get the active/recovery counts 514 */ 515 b = get_cmd640_reg(drwtim_regs[index]); 516 active_counts[index] = (b >> 4) ? (b >> 4) : 0x10; 517 recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10; 518} 519 520 521/* 522 * This routine writes the prepared setup/active/recovery counts 523 * for a drive into the cmd640 chipset registers to active them. 524 */ 525static void program_drive_counts (unsigned int index) 526{ 527 unsigned long flags; 528 u8 setup_count = setup_counts[index]; 529 u8 active_count = active_counts[index]; 530 u8 recovery_count = recovery_counts[index]; 531 532 /* 533 * Set up address setup count and drive read/write timing registers. 534 * Primary interface has individual count/timing registers for 535 * each drive. Secondary interface has one common set of registers, 536 * so we merge the timings, using the slowest value for each timing. 537 */ 538 if (index > 1) { 539 unsigned int mate; 540 if (cmd_drives[mate = index ^ 1]->present) { 541 if (setup_count < setup_counts[mate]) 542 setup_count = setup_counts[mate]; 543 if (active_count < active_counts[mate]) 544 active_count = active_counts[mate]; 545 if (recovery_count < recovery_counts[mate]) 546 recovery_count = recovery_counts[mate]; 547 } 548 } 549 550 /* 551 * Convert setup_count to internal chipset representation 552 */ 553 switch (setup_count) { 554 case 4: setup_count = 0x00; break; 555 case 3: setup_count = 0x80; break; 556 case 1: 557 case 2: setup_count = 0x40; break; 558 default: setup_count = 0xc0; /* case 5 */ 559 } 560 561 /* 562 * Now that everything is ready, program the new timings 563 */ 564 spin_lock_irqsave(&ide_lock, flags); 565 /* 566 * Program the address_setup clocks into ARTTIM reg, 567 * and then the active/recovery counts into the DRWTIM reg 568 * (this converts counts of 16 into counts of zero -- okay). 569 */ 570 setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f; 571 __put_cmd640_reg(arttim_regs[index], setup_count); 572 __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count)); 573 spin_unlock_irqrestore(&ide_lock, flags); 574} 575 576/* 577 * Set a specific pio_mode for a drive 578 */ 579static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time) 580{ 581 int setup_time, active_time, recovery_time, clock_time; 582 u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count; 583 int bus_speed = system_bus_clock(); 584 585 if (pio_mode > 5) 586 pio_mode = 5; 587 setup_time = ide_pio_timings[pio_mode].setup_time; 588 active_time = ide_pio_timings[pio_mode].active_time; 589 recovery_time = cycle_time - (setup_time + active_time); 590 clock_time = 1000 / bus_speed; 591 cycle_count = (cycle_time + clock_time - 1) / clock_time; 592 593 setup_count = (setup_time + clock_time - 1) / clock_time; 594 595 active_count = (active_time + clock_time - 1) / clock_time; 596 if (active_count < 2) 597 active_count = 2; /* minimum allowed by cmd640 */ 598 599 recovery_count = (recovery_time + clock_time - 1) / clock_time; 600 recovery_count2 = cycle_count - (setup_count + active_count); 601 if (recovery_count2 > recovery_count) 602 recovery_count = recovery_count2; 603 if (recovery_count < 2) 604 recovery_count = 2; /* minimum allowed by cmd640 */ 605 if (recovery_count > 17) { 606 active_count += recovery_count - 17; 607 recovery_count = 17; 608 } 609 if (active_count > 16) 610 active_count = 16; /* maximum allowed by cmd640 */ 611 if (cmd640_chip_version > 1) 612 recovery_count -= 1; /* cmd640b uses (count + 1)*/ 613 if (recovery_count > 16) 614 recovery_count = 16; /* maximum allowed by cmd640 */ 615 616 setup_counts[index] = setup_count; 617 active_counts[index] = active_count; 618 recovery_counts[index] = recovery_count; 619 620 /* 621 * In a perfect world, we might set the drive pio mode here 622 * (using WIN_SETFEATURE) before continuing. 623 * 624 * But we do not, because: 625 * 1) this is the wrong place to do it (proper is do_special() in ide.c) 626 * 2) in practice this is rarely, if ever, necessary 627 */ 628 program_drive_counts (index); 629} 630 631/* 632 * Drive PIO mode selection: 633 */ 634static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted) 635{ 636 u8 b; 637 ide_pio_data_t d; 638 unsigned int index = 0; 639 640 while (drive != cmd_drives[index]) { 641 if (++index > 3) { 642 printk("%s: bad news in cmd640_tune_drive\n", drive->name); 643 return; 644 } 645 } 646 switch (mode_wanted) { 647 case 6: /* set fast-devsel off */ 648 case 7: /* set fast-devsel on */ 649 mode_wanted &= 1; 650 b = get_cmd640_reg(CNTRL) & ~0x27; 651 if (mode_wanted) 652 b |= 0x27; 653 put_cmd640_reg(CNTRL, b); 654 printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis"); 655 return; 656 657 case 8: /* set prefetch off */ 658 case 9: /* set prefetch on */ 659 mode_wanted &= 1; 660 set_prefetch_mode(index, mode_wanted); 661 printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis"); 662 return; 663 } 664 665 (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d); 666 cmd640_set_mode (index, d.pio_mode, d.cycle_time); 667 668 printk ("%s: selected cmd640 PIO mode%d (%dns)%s", 669 drive->name, 670 d.pio_mode, 671 d.cycle_time, 672 d.overridden ? " (overriding vendor mode)" : ""); 673 display_clocks(index); 674 return; 675} 676 677#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 678 679static int pci_conf1(void) 680{ 681 u32 tmp; 682 unsigned long flags; 683 684 spin_lock_irqsave(&ide_lock, flags); 685 outb(0x01, 0xCFB); 686 tmp = inl(0xCF8); 687 outl(0x80000000, 0xCF8); 688 if (inl(0xCF8) == 0x80000000) { 689 outl(tmp, 0xCF8); 690 spin_unlock_irqrestore(&ide_lock, flags); 691 return 1; 692 } 693 outl(tmp, 0xCF8); 694 spin_unlock_irqrestore(&ide_lock, flags); 695 return 0; 696} 697 698static int pci_conf2(void) 699{ 700 unsigned long flags; 701 702 spin_lock_irqsave(&ide_lock, flags); 703 outb(0x00, 0xCFB); 704 outb(0x00, 0xCF8); 705 outb(0x00, 0xCFA); 706 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) { 707 spin_unlock_irqrestore(&ide_lock, flags); 708 return 1; 709 } 710 spin_unlock_irqrestore(&ide_lock, flags); 711 return 0; 712} 713 714/* 715 * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c 716 */ 717int __init ide_probe_for_cmd640x (void) 718{ 719#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 720 int second_port_toggled = 0; 721#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 722 int second_port_cmd640 = 0; 723 const char *bus_type, *port2; 724 unsigned int index; 725 u8 b, cfr; 726 727 if (cmd640_vlb && probe_for_cmd640_vlb()) { 728 bus_type = "VLB"; 729 } else { 730 cmd640_vlb = 0; 731 /* Find out what kind of PCI probing is supported otherwise 732 Justin Gibbs will sulk.. */ 733 if (pci_conf1() && probe_for_cmd640_pci1()) 734 bus_type = "PCI (type1)"; 735 else if (pci_conf2() && probe_for_cmd640_pci2()) 736 bus_type = "PCI (type2)"; 737 else 738 return 0; 739 } 740 /* 741 * Undocumented magic (there is no 0x5b reg in specs) 742 */ 743 put_cmd640_reg(0x5b, 0xbd); 744 if (get_cmd640_reg(0x5b) != 0xbd) { 745 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n"); 746 return 0; 747 } 748 put_cmd640_reg(0x5b, 0); 749 750#ifdef CMD640_DUMP_REGS 751 cmd640_dump_regs(); 752#endif 753 754 /* 755 * Documented magic begins here 756 */ 757 cfr = get_cmd640_reg(CFR); 758 cmd640_chip_version = cfr & CFR_DEVREV; 759 if (cmd640_chip_version == 0) { 760 printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version); 761 return 0; 762 } 763 764 /* 765 * Initialize data for primary port 766 */ 767 setup_device_ptrs (); 768 printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n", 769 cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr); 770 cmd_hwif0->chipset = ide_cmd640; 771#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 772 cmd_hwif0->tuneproc = &cmd640_tune_drive; 773#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 774 775 /* 776 * Ensure compatibility by always using the slowest timings 777 * for access to the drive's command register block, 778 * and reset the prefetch burstsize to default (512 bytes). 779 * 780 * Maybe we need a way to NOT do these on *some* systems? 781 */ 782 put_cmd640_reg(CMDTIM, 0); 783 put_cmd640_reg(BRST, 0x40); 784 785 /* 786 * Try to enable the secondary interface, if not already enabled 787 */ 788 if (cmd_hwif1->noprobe) { 789 port2 = "not probed"; 790 } else { 791 b = get_cmd640_reg(CNTRL); 792 if (secondary_port_responding()) { 793 if ((b & CNTRL_ENA_2ND)) { 794 second_port_cmd640 = 1; 795 port2 = "okay"; 796 } else if (cmd640_vlb) { 797 second_port_cmd640 = 1; 798 port2 = "alive"; 799 } else 800 port2 = "not cmd640"; 801 } else { 802 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */ 803 if (secondary_port_responding()) { 804 second_port_cmd640 = 1; 805#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 806 second_port_toggled = 1; 807#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 808 port2 = "enabled"; 809 } else { 810 put_cmd640_reg(CNTRL, b); /* restore original setting */ 811 port2 = "not responding"; 812 } 813 } 814 } 815 816 /* 817 * Initialize data for secondary cmd640 port, if enabled 818 */ 819 if (second_port_cmd640) { 820 cmd_hwif0->serialized = 1; 821 cmd_hwif1->serialized = 1; 822 cmd_hwif1->chipset = ide_cmd640; 823 cmd_hwif0->mate = cmd_hwif1; 824 cmd_hwif1->mate = cmd_hwif0; 825 cmd_hwif1->channel = 1; 826#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 827 cmd_hwif1->tuneproc = &cmd640_tune_drive; 828#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 829 } 830 printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name, 831 cmd_hwif0->serialized ? "" : "not ", port2); 832 833 /* 834 * Establish initial timings/prefetch for all drives. 835 * Do not unnecessarily disturb any prior BIOS setup of these. 836 */ 837 for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) { 838 ide_drive_t *drive = cmd_drives[index]; 839#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED 840 if (drive->autotune || ((index > 1) && second_port_toggled)) { 841 /* 842 * Reset timing to the slowest speed and turn off prefetch. 843 * This way, the drive identify code has a better chance. 844 */ 845 setup_counts [index] = 4; /* max possible */ 846 active_counts [index] = 16; /* max possible */ 847 recovery_counts [index] = 16; /* max possible */ 848 program_drive_counts (index); 849 set_prefetch_mode (index, 0); 850 printk("cmd640: drive%d timings/prefetch cleared\n", index); 851 } else { 852 /* 853 * Record timings/prefetch without changing them. 854 * This preserves any prior BIOS setup. 855 */ 856 retrieve_drive_counts (index); 857 check_prefetch (index); 858 printk("cmd640: drive%d timings/prefetch(%s) preserved", 859 index, drive->no_io_32bit ? "off" : "on"); 860 display_clocks(index); 861 } 862#else 863 /* 864 * Set the drive unmask flags to match the prefetch setting 865 */ 866 check_prefetch (index); 867 printk("cmd640: drive%d timings/prefetch(%s) preserved\n", 868 index, drive->no_io_32bit ? "off" : "on"); 869#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ 870 } 871 872#ifdef CMD640_DUMP_REGS 873 cmd640_dump_regs(); 874#endif 875 return 1; 876} 877