cmd640.c 24 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
/*
 *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)
 */

/*
 *  Original authors:	abramov@cecmow.enet.dec.com (Igor Abramov)
 *  			mlord@pobox.com (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for the advanced features and bugs
 *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
 *
 *  These chips are basically fucked by design, and getting this driver
 *  to work on every motherboard design that uses this screwed chip seems
 *  bloody well impossible.  However, we're still trying.
 *
 *  Version 0.97 worked for everybody.
 *
 *  User feedback is essential.  Many thanks to the beta test team:
 *
 *  A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
 *  bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
 *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
 *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
 *  flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
 *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
 *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
 *  peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
 *  s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
 *  steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
 *  liug@mama.indstate.edu, and others.
 *
 *  Version 0.01	Initial version, hacked out of ide.c,
 *			and #include'd rather than compiled separately.
 *			This will get cleaned up in a subsequent release.
 *
 *  Version 0.02	Fixes for vlb initialization code, enable prefetch
 *			for versions 'B' and 'C' of chip by default,
 *			some code cleanup.
 *
 *  Version 0.03	Added reset of secondary interface,
 *			and black list for devices which are not compatible
 *			with prefetch mode. Separate function for setting
 *			prefetch is added, possibly it will be called some
 *			day from ioctl processing code.
 *
 *  Version 0.04	Now configs/compiles separate from ide.c
 *
 *  Version 0.05	Major rewrite of interface timing code.
 *			Added new function cmd640_set_mode to set PIO mode
 *			from ioctl call. New drives added to black list.
 *
 *  Version 0.06	More code cleanup. Prefetch is enabled only for
 *			detected hard drives, not included in prefetch
 *			black list.
 *
 *  Version 0.07	Changed to more conservative drive tuning policy.
 *			Unknown drives, which report PIO < 4 are set to
 *			(reported_PIO - 1) if it is supported, or to PIO0.
 *			List of known drives extended by info provided by
 *			CMD at their ftp site.
 *
 *  Version 0.08	Added autotune/noautotune support.
 *
 *  Version 0.09	Try to be smarter about 2nd port enabling.
 *  Version 0.10	Be nice and don't reset 2nd port.
 *  Version 0.11	Try to handle more weird situations.
 *
 *  Version 0.12	Lots of bug fixes from Laszlo Peter
 *			irq unmasking disabled for reliability.
 *			try to be even smarter about the second port.
 *			tidy up source code formatting.
 *  Version 0.13	permit irq unmasking again.
 *  Version 0.90	massive code cleanup, some bugs fixed.
 *			defaults all drives to PIO mode0, prefetch off.
 *			autotune is OFF by default, with compile time flag.
 *			prefetch can be turned OFF/ON using "hdparm -p8/-p9"
 *			 (requires hdparm-3.1 or newer)
 *  Version 0.91	first release to linux-kernel list.
 *  Version 0.92	move initial reg dump to separate callable function
 *			change "readahead" to "prefetch" to avoid confusion
 *  Version 0.95	respect original BIOS timings unless autotuning.
 *			tons of code cleanup and rearrangement.
 *			added CONFIG_BLK_DEV_CMD640_ENHANCED option
 *			prevent use of unmask when prefetch is on
 *  Version 0.96	prevent use of io_32bit when prefetch is off
 *  Version 0.97	fix VLB secondary interface for sjd@slip.net
 *			other minor tune-ups:  0.96 was very good.
 *  Version 0.98	ignore PCI version when disabled by BIOS
 *  Version 0.99	display setup/active/recovery clocks with PIO mode
 *  Version 1.00	Mmm.. cannot depend on PCMD_ENA in all systems
 *  Version 1.01	slow/fast devsel can be selected with "hdparm -p6/-p7"
 *			 ("fast" is necessary for 32bit I/O in some systems)
 *  Version 1.02	fix bug that resulted in slow "setup times"
 *			 (patch courtesy of Zoltan Hidvegi)
 */

#define CMD640_PREFETCH_MASKS 1

//#define CMD640_DUMP_REGS

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/*
 * This flag is set in ide.c by the parameter:  ide0=cmd640_vlb
 */
int cmd640_vlb = 0;

/*
 * CMD640 specific registers definition.
 */

#define VID		0x00
#define DID		0x02
#define PCMD		0x04
#define   PCMD_ENA	0x01
#define PSTTS		0x06
#define REVID		0x08
#define PROGIF		0x09
#define SUBCL		0x0a
#define BASCL		0x0b
#define BaseA0		0x10
#define BaseA1		0x14
#define BaseA2		0x18
#define BaseA3		0x1c
#define INTLINE		0x3c
#define INPINE		0x3d

#define	CFR		0x50
#define   CFR_DEVREV		0x03
#define   CFR_IDE01INTR		0x04
#define	  CFR_DEVID		0x18
#define	  CFR_AT_VESA_078h	0x20
#define	  CFR_DSA1		0x40
#define	  CFR_DSA0		0x80

#define CNTRL		0x51
#define	  CNTRL_DIS_RA0		0x40
#define   CNTRL_DIS_RA1		0x80
#define	  CNTRL_ENA_2ND		0x08

#define	CMDTIM		0x52
#define	ARTTIM0		0x53
#define	DRWTIM0		0x54
#define ARTTIM1 	0x55
#define DRWTIM1		0x56
#define ARTTIM23	0x57
#define   ARTTIM23_DIS_RA2	0x04
#define   ARTTIM23_DIS_RA3	0x08
#define DRWTIM23	0x58
#define BRST		0x59

/*
 * Registers and masks for easy access by drive index:
 */
static u8 prefetch_regs[4]  = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};

#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED

static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};

/*
 * Current cmd640 timing values for each drive.
 * The defaults for each are the slowest possible timings.
 */
static u8 setup_counts[4]    = {4, 4, 4, 4};     /* Address setup count (in clocks) */
static u8 active_counts[4]   = {16, 16, 16, 16}; /* Active count   (encoded) */
static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

186 187
static DEFINE_SPINLOCK(cmd640_lock);

Linus Torvalds's avatar
Linus Torvalds committed
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261
/*
 * These are initialized to point at the devices we control
 */
static ide_hwif_t  *cmd_hwif0, *cmd_hwif1;
static ide_drive_t *cmd_drives[4];

/*
 * Interface to access cmd640x registers
 */
static unsigned int cmd640_key;
static void (*__put_cmd640_reg)(u16 reg, u8 val);
static u8 (*__get_cmd640_reg)(u16 reg);

/*
 * This is read from the CFR reg, and is used in several places.
 */
static unsigned int cmd640_chip_version;

/*
 * The CMD640x chip does not support DWORD config write cycles, but some
 * of the BIOSes use them to implement the config services.
 * Therefore, we must use direct IO instead.
 */

/* PCI method 1 access */

static void put_cmd640_reg_pci1 (u16 reg, u8 val)
{
	outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
	outb_p(val, (reg & 3) | 0xcfc);
}

static u8 get_cmd640_reg_pci1 (u16 reg)
{
	outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
	return inb_p((reg & 3) | 0xcfc);
}

/* PCI method 2 access (from CMD datasheet) */

static void put_cmd640_reg_pci2 (u16 reg, u8 val)
{
	outb_p(0x10, 0xcf8);
	outb_p(val, cmd640_key + reg);
	outb_p(0, 0xcf8);
}

static u8 get_cmd640_reg_pci2 (u16 reg)
{
	u8 b;

	outb_p(0x10, 0xcf8);
	b = inb_p(cmd640_key + reg);
	outb_p(0, 0xcf8);
	return b;
}

/* VLB access */

static void put_cmd640_reg_vlb (u16 reg, u8 val)
{
	outb_p(reg, cmd640_key);
	outb_p(val, cmd640_key + 4);
}

static u8 get_cmd640_reg_vlb (u16 reg)
{
	outb_p(reg, cmd640_key);
	return inb_p(cmd640_key + 4);
}

static u8 get_cmd640_reg(u16 reg)
{
	unsigned long flags;
262
	u8 b;
Linus Torvalds's avatar
Linus Torvalds committed
263

264
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
265
	b = __get_cmd640_reg(reg);
266
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
267 268 269 270 271 272 273
	return b;
}

static void put_cmd640_reg(u16 reg, u8 val)
{
	unsigned long flags;

274
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
275
	__put_cmd640_reg(reg,val);
276
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353
}

static int __init match_pci_cmd640_device (void)
{
	const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
	unsigned int i;
	for (i = 0; i < 4; i++) {
		if (get_cmd640_reg(i) != ven_dev[i])
			return 0;
	}
#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
	if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
		printk("ide: cmd640 on PCI disabled by BIOS\n");
		return 0;
	}
#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
	return 1; /* success */
}

/*
 * Probe for CMD640x -- pci method 1
 */
static int __init probe_for_cmd640_pci1 (void)
{
	__get_cmd640_reg = get_cmd640_reg_pci1;
	__put_cmd640_reg = put_cmd640_reg_pci1;
	for (cmd640_key = 0x80000000;
	     cmd640_key <= 0x8000f800;
	     cmd640_key += 0x800) {
		if (match_pci_cmd640_device())
			return 1; /* success */
	}
	return 0;
}

/*
 * Probe for CMD640x -- pci method 2
 */
static int __init probe_for_cmd640_pci2 (void)
{
	__get_cmd640_reg = get_cmd640_reg_pci2;
	__put_cmd640_reg = put_cmd640_reg_pci2;
	for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
		if (match_pci_cmd640_device())
			return 1; /* success */
	}
	return 0;
}

/*
 * Probe for CMD640x -- vlb
 */
static int __init probe_for_cmd640_vlb (void)
{
	u8 b;

	__get_cmd640_reg = get_cmd640_reg_vlb;
	__put_cmd640_reg = put_cmd640_reg_vlb;
	cmd640_key = 0x178;
	b = get_cmd640_reg(CFR);
	if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
		cmd640_key = 0x78;
		b = get_cmd640_reg(CFR);
		if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
			return 0;
	}
	return 1; /* success */
}

/*
 *  Returns 1 if an IDE interface/drive exists at 0x170,
 *  Returns 0 otherwise.
 */
static int __init secondary_port_responding (void)
{
	unsigned long flags;

354
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
355 356 357 358 359 360 361

	outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET);	/* select drive0 */
	udelay(100);
	if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
		outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
		udelay(100);
		if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
362
			spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
363 364 365
			return 0; /* nothing responded */
		}
	}
366
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442
	return 1; /* success */
}

#ifdef CMD640_DUMP_REGS
/*
 * Dump out all cmd640 registers.  May be called from ide.c
 */
static void cmd640_dump_regs (void)
{
	unsigned int reg = cmd640_vlb ? 0x50 : 0x00;

	/* Dump current state of chip registers */
	printk("ide: cmd640 internal register dump:");
	for (; reg <= 0x59; reg++) {
		if (!(reg & 0x0f))
			printk("\n%04x:", reg);
		printk(" %02x", get_cmd640_reg(reg));
	}
	printk("\n");
}
#endif

/*
 * Check whether prefetch is on for a drive,
 * and initialize the unmask flags for safe operation.
 */
static void __init check_prefetch (unsigned int index)
{
	ide_drive_t *drive = cmd_drives[index];
	u8 b = get_cmd640_reg(prefetch_regs[index]);

	if (b & prefetch_masks[index]) {	/* is prefetch off? */
		drive->no_unmask = 0;
		drive->no_io_32bit = 1;
		drive->io_32bit = 0;
	} else {
#if CMD640_PREFETCH_MASKS
		drive->no_unmask = 1;
		drive->unmask = 0;
#endif
		drive->no_io_32bit = 0;
	}
}

/*
 * Figure out which devices we control
 */
static void __init setup_device_ptrs (void)
{
	unsigned int i;

	cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
	cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
	for (i = 0; i < MAX_HWIFS; i++) {
		ide_hwif_t *hwif = &ide_hwifs[i];
		if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) {
			if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0)
				cmd_hwif0 = hwif;
			else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
				cmd_hwif1 = hwif;
		}
	}
	cmd_drives[0] = &cmd_hwif0->drives[0];
	cmd_drives[1] = &cmd_hwif0->drives[1];
	cmd_drives[2] = &cmd_hwif1->drives[0];
	cmd_drives[3] = &cmd_hwif1->drives[1];
}

#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED

/*
 * Sets prefetch mode for a drive.
 */
static void set_prefetch_mode (unsigned int index, int mode)
{
	ide_drive_t *drive = cmd_drives[index];
443
	unsigned long flags;
Linus Torvalds's avatar
Linus Torvalds committed
444 445 446
	int reg = prefetch_regs[index];
	u8 b;

447
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462
	b = __get_cmd640_reg(reg);
	if (mode) {	/* want prefetch on? */
#if CMD640_PREFETCH_MASKS
		drive->no_unmask = 1;
		drive->unmask = 0;
#endif
		drive->no_io_32bit = 0;
		b &= ~prefetch_masks[index];	/* enable prefetch */
	} else {
		drive->no_unmask = 0;
		drive->no_io_32bit = 1;
		drive->io_32bit = 0;
		b |= prefetch_masks[index];	/* disable prefetch */
	}
	__put_cmd640_reg(reg, b);
463
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487
}

/*
 * Dump out current drive clocks settings
 */
static void display_clocks (unsigned int index)
{
	u8 active_count, recovery_count;

	active_count = active_counts[index];
	if (active_count == 1)
		++active_count;
	recovery_count = recovery_counts[index];
	if (active_count > 3 && recovery_count == 1)
		++recovery_count;
	if (cmd640_chip_version > 1)
		recovery_count += 1;  /* cmd640b uses (count + 1)*/
	printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
}

/*
 * Pack active and recovery counts into single byte representation
 * used by controller
 */
488
static inline u8 pack_nibbles (u8 upper, u8 lower)
Linus Torvalds's avatar
Linus Torvalds committed
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
{
	return ((upper & 0x0f) << 4) | (lower & 0x0f);
}

/*
 * This routine retrieves the initial drive timings from the chipset.
 */
static void __init retrieve_drive_counts (unsigned int index)
{
	u8 b;

	/*
	 * Get the internal setup timing, and convert to clock count
	 */
	b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
	switch (b) {
		case 0x00: b = 4; break;
		case 0x80: b = 3; break;
		case 0x40: b = 2; break;
		default:   b = 5; break;
	}
	setup_counts[index] = b;

	/*
	 * Get the active/recovery counts
	 */
	b = get_cmd640_reg(drwtim_regs[index]);
	active_counts[index]   = (b >> 4)   ? (b >> 4)   : 0x10;
	recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
}


/*
 * This routine writes the prepared setup/active/recovery counts
 * for a drive into the cmd640 chipset registers to active them.
 */
static void program_drive_counts (unsigned int index)
{
	unsigned long flags;
	u8 setup_count    = setup_counts[index];
	u8 active_count   = active_counts[index];
	u8 recovery_count = recovery_counts[index];

	/*
	 * Set up address setup count and drive read/write timing registers.
	 * Primary interface has individual count/timing registers for
	 * each drive.  Secondary interface has one common set of registers,
	 * so we merge the timings, using the slowest value for each timing.
	 */
	if (index > 1) {
		unsigned int mate;
		if (cmd_drives[mate = index ^ 1]->present) {
			if (setup_count < setup_counts[mate])
				setup_count = setup_counts[mate];
			if (active_count < active_counts[mate])
				active_count = active_counts[mate];
			if (recovery_count < recovery_counts[mate])
				recovery_count = recovery_counts[mate];
		}
	}

	/*
	 * Convert setup_count to internal chipset representation
	 */
	switch (setup_count) {
		case 4:	 setup_count = 0x00; break;
		case 3:	 setup_count = 0x80; break;
		case 1:
		case 2:	 setup_count = 0x40; break;
		default: setup_count = 0xc0; /* case 5 */
	}

	/*
	 * Now that everything is ready, program the new timings
	 */
564
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
565 566 567 568 569 570 571 572
	/*
	 * Program the address_setup clocks into ARTTIM reg,
	 * and then the active/recovery counts into the DRWTIM reg
	 * (this converts counts of 16 into counts of zero -- okay).
	 */
	setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
	__put_cmd640_reg(arttim_regs[index], setup_count);
	__put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
573
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
}

/*
 * Set a specific pio_mode for a drive
 */
static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time)
{
	int setup_time, active_time, recovery_time, clock_time;
	u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
	int bus_speed = system_bus_clock();

	if (pio_mode > 5)
		pio_mode = 5;
	setup_time  = ide_pio_timings[pio_mode].setup_time;
	active_time = ide_pio_timings[pio_mode].active_time;
	recovery_time = cycle_time - (setup_time + active_time);
	clock_time = 1000 / bus_speed;
	cycle_count = (cycle_time + clock_time - 1) / clock_time;

	setup_count = (setup_time + clock_time - 1) / clock_time;

	active_count = (active_time + clock_time - 1) / clock_time;
	if (active_count < 2)
		active_count = 2; /* minimum allowed by cmd640 */

	recovery_count = (recovery_time + clock_time - 1) / clock_time;
	recovery_count2 = cycle_count - (setup_count + active_count);
	if (recovery_count2 > recovery_count)
		recovery_count = recovery_count2;
	if (recovery_count < 2)
		recovery_count = 2; /* minimum allowed by cmd640 */
	if (recovery_count > 17) {
		active_count += recovery_count - 17;
		recovery_count = 17;
	}
	if (active_count > 16)
		active_count = 16; /* maximum allowed by cmd640 */
	if (cmd640_chip_version > 1)
		recovery_count -= 1;  /* cmd640b uses (count + 1)*/
	if (recovery_count > 16)
		recovery_count = 16; /* maximum allowed by cmd640 */

	setup_counts[index]    = setup_count;
	active_counts[index]   = active_count;
	recovery_counts[index] = recovery_count;

	/*
	 * In a perfect world, we might set the drive pio mode here
	 * (using WIN_SETFEATURE) before continuing.
	 *
	 * But we do not, because:
	 *	1) this is the wrong place to do it (proper is do_special() in ide.c)
	 * 	2) in practice this is rarely, if ever, necessary
	 */
	program_drive_counts (index);
}

631
static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
Linus Torvalds's avatar
Linus Torvalds committed
632
{
633
	unsigned int index = 0, cycle_time;
Linus Torvalds's avatar
Linus Torvalds committed
634 635 636 637
	u8 b;

	while (drive != cmd_drives[index]) {
		if (++index > 3) {
638 639
			printk(KERN_ERR "%s: bad news in %s\n",
					drive->name, __FUNCTION__);
Linus Torvalds's avatar
Linus Torvalds committed
640 641 642
			return;
		}
	}
643
	switch (pio) {
Linus Torvalds's avatar
Linus Torvalds committed
644 645 646
		case 6: /* set fast-devsel off */
		case 7: /* set fast-devsel on */
			b = get_cmd640_reg(CNTRL) & ~0x27;
647
			if (pio & 1)
Linus Torvalds's avatar
Linus Torvalds committed
648 649
				b |= 0x27;
			put_cmd640_reg(CNTRL, b);
650
			printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, (pio & 1) ? "en" : "dis");
Linus Torvalds's avatar
Linus Torvalds committed
651 652 653 654
			return;

		case 8: /* set prefetch off */
		case 9: /* set prefetch on */
655 656
			set_prefetch_mode(index, pio & 1);
			printk("%s: %sabled cmd640 prefetch\n", drive->name, (pio & 1) ? "en" : "dis");
Linus Torvalds's avatar
Linus Torvalds committed
657 658 659
			return;
	}

660 661
	cycle_time = ide_pio_cycle_time(drive, pio);
	cmd640_set_mode(index, pio, cycle_time);
Linus Torvalds's avatar
Linus Torvalds committed
662

663
	printk("%s: selected cmd640 PIO mode%d (%dns)",
664
		drive->name, pio, cycle_time);
665

Linus Torvalds's avatar
Linus Torvalds committed
666 667 668 669 670 671 672 673
	display_clocks(index);
}

#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

static int pci_conf1(void)
{
	unsigned long flags;
674
	u32 tmp;
Linus Torvalds's avatar
Linus Torvalds committed
675

676
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
677 678 679 680 681
	outb(0x01, 0xCFB);
	tmp = inl(0xCF8);
	outl(0x80000000, 0xCF8);
	if (inl(0xCF8) == 0x80000000) {
		outl(tmp, 0xCF8);
682
		spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
683 684 685
		return 1;
	}
	outl(tmp, 0xCF8);
686
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
687 688 689 690 691 692 693
	return 0;
}

static int pci_conf2(void)
{
	unsigned long flags;

694
	spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
695 696 697 698
	outb(0x00, 0xCFB);
	outb(0x00, 0xCF8);
	outb(0x00, 0xCFA);
	if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
699
		spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
700 701
		return 1;
	}
702
	spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
703 704 705 706
	return 0;
}

/*
707
 * Probe for a cmd640 chipset, and initialize it if found.
Linus Torvalds's avatar
Linus Torvalds committed
708
 */
709
static int __init cmd640x_init(void)
Linus Torvalds's avatar
Linus Torvalds committed
710 711 712 713 714 715 716 717
{
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
	int second_port_toggled = 0;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
	int second_port_cmd640 = 0;
	const char *bus_type, *port2;
	unsigned int index;
	u8 b, cfr;
718
	u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
Linus Torvalds's avatar
Linus Torvalds committed
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764

	if (cmd640_vlb && probe_for_cmd640_vlb()) {
		bus_type = "VLB";
	} else {
		cmd640_vlb = 0;
		/* Find out what kind of PCI probing is supported otherwise
		   Justin Gibbs will sulk.. */
		if (pci_conf1() && probe_for_cmd640_pci1())
			bus_type = "PCI (type1)";
		else if (pci_conf2() && probe_for_cmd640_pci2())
			bus_type = "PCI (type2)";
		else
			return 0;
	}
	/*
	 * Undocumented magic (there is no 0x5b reg in specs)
	 */
	put_cmd640_reg(0x5b, 0xbd);
	if (get_cmd640_reg(0x5b) != 0xbd) {
		printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
		return 0;
	}
	put_cmd640_reg(0x5b, 0);

#ifdef CMD640_DUMP_REGS
	cmd640_dump_regs();
#endif

	/*
	 * Documented magic begins here
	 */
	cfr = get_cmd640_reg(CFR);
	cmd640_chip_version = cfr & CFR_DEVREV;
	if (cmd640_chip_version == 0) {
		printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
		return 0;
	}

	/*
	 * Initialize data for primary port
	 */
	setup_device_ptrs ();
	printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
	       cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
	cmd_hwif0->chipset = ide_cmd640;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
765 766
	cmd_hwif0->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
				IDE_HFLAG_ABUSE_FAST_DEVSEL;
Bartlomiej Zolnierkiewicz's avatar
Bartlomiej Zolnierkiewicz committed
767
	cmd_hwif0->pio_mask = ATA_PIO5;
768
	cmd_hwif0->set_pio_mode = &cmd640_set_pio_mode;
Linus Torvalds's avatar
Linus Torvalds committed
769 770
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */

771 772
	idx[0] = cmd_hwif0->index;

Linus Torvalds's avatar
Linus Torvalds committed
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
	/*
	 * Ensure compatibility by always using the slowest timings
	 * for access to the drive's command register block,
	 * and reset the prefetch burstsize to default (512 bytes).
	 *
	 * Maybe we need a way to NOT do these on *some* systems?
	 */
	put_cmd640_reg(CMDTIM, 0);
	put_cmd640_reg(BRST, 0x40);

	/*
	 * Try to enable the secondary interface, if not already enabled
	 */
	if (cmd_hwif1->noprobe) {
		port2 = "not probed";
	} else {
		b = get_cmd640_reg(CNTRL);
		if (secondary_port_responding()) {
			if ((b & CNTRL_ENA_2ND)) {
				second_port_cmd640 = 1;
				port2 = "okay";
			} else if (cmd640_vlb) {
				second_port_cmd640 = 1;
				port2 = "alive";
			} else
				port2 = "not cmd640";
		} else {
			put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
			if (secondary_port_responding()) {
				second_port_cmd640 = 1;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
				second_port_toggled = 1;
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
				port2 = "enabled";
			} else {
				put_cmd640_reg(CNTRL, b); /* restore original setting */
				port2 = "not responding";
			}
		}
	}

	/*
	 * Initialize data for secondary cmd640 port, if enabled
	 */
	if (second_port_cmd640) {
		cmd_hwif0->serialized = 1;
		cmd_hwif1->serialized = 1;
		cmd_hwif1->chipset = ide_cmd640;
		cmd_hwif0->mate = cmd_hwif1;
		cmd_hwif1->mate = cmd_hwif0;
		cmd_hwif1->channel = 1;
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
825 826
		cmd_hwif1->host_flags = IDE_HFLAG_ABUSE_PREFETCH |
					IDE_HFLAG_ABUSE_FAST_DEVSEL;
Bartlomiej Zolnierkiewicz's avatar
Bartlomiej Zolnierkiewicz committed
827
		cmd_hwif1->pio_mask = ATA_PIO5;
828
		cmd_hwif1->set_pio_mode = &cmd640_set_pio_mode;
Linus Torvalds's avatar
Linus Torvalds committed
829
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
830 831

		idx[1] = cmd_hwif1->index;
Linus Torvalds's avatar
Linus Torvalds committed
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
	}
	printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
		cmd_hwif0->serialized ? "" : "not ", port2);

	/*
	 * Establish initial timings/prefetch for all drives.
	 * Do not unnecessarily disturb any prior BIOS setup of these.
	 */
	for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
		ide_drive_t *drive = cmd_drives[index];
#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
		if (drive->autotune || ((index > 1) && second_port_toggled)) {
	 		/*
	 		 * Reset timing to the slowest speed and turn off prefetch.
			 * This way, the drive identify code has a better chance.
			 */
			setup_counts    [index] = 4;	/* max possible */
			active_counts   [index] = 16;	/* max possible */
			recovery_counts [index] = 16;	/* max possible */
			program_drive_counts (index);
			set_prefetch_mode (index, 0);
			printk("cmd640: drive%d timings/prefetch cleared\n", index);
		} else {
			/*
			 * Record timings/prefetch without changing them.
			 * This preserves any prior BIOS setup.
			 */
			retrieve_drive_counts (index);
			check_prefetch (index);
			printk("cmd640: drive%d timings/prefetch(%s) preserved",
				index, drive->no_io_32bit ? "off" : "on");
			display_clocks(index);
		}
#else
		/*
		 * Set the drive unmask flags to match the prefetch setting
		 */
		check_prefetch (index);
		printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
			index, drive->no_io_32bit ? "off" : "on");
#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
	}

#ifdef CMD640_DUMP_REGS
	cmd640_dump_regs();
#endif
878 879 880

	ide_device_add(idx);

Linus Torvalds's avatar
Linus Torvalds committed
881 882 883
	return 1;
}

884 885 886 887
module_param_named(probe_vlb, cmd640_vlb, bool, 0);
MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");

module_init(cmd640x_init);