2 * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
4 * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
8 * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
9 * mlord@pobox.com (Mark Lord)
11 * See linux/MAINTAINERS for address of current maintainer.
13 * This file provides support for the advanced features and bugs
14 * of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
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.
20 * Version 0.97 worked for everybody.
22 * User feedback is essential. Many thanks to the beta test team:
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.
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.
40 * Version 0.02 Fixes for vlb initialization code, enable prefetch
41 * for versions 'B' and 'C' of chip by default,
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.
50 * Version 0.04 Now configs/compiles separate from ide.c
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.
56 * Version 0.06 More code cleanup. Prefetch is enabled only for
57 * detected hard drives, not included in prefetch
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.
66 * Version 0.08 Added autotune/noautotune support.
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.
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)
101 #undef REALLY_SLOW_IO /* most systems can safely undef this */
102 #define CMD640_PREFETCH_MASKS 1
104 #include <linux/config.h>
105 #include <linux/module.h>
106 #include <linux/types.h>
107 #include <linux/kernel.h>
108 #include <linux/delay.h>
109 #include <linux/timer.h>
110 #include <linux/mm.h>
111 #include <linux/ioport.h>
112 #include <linux/blkdev.h>
113 #include <linux/hdreg.h>
114 #include <linux/ide.h>
115 #include <linux/init.h>
119 #include "ide_modes.h"
122 * This flag is set in ide.c by the parameter: ide0=cmd640_vlb
125 static int cmd640_vlb = 0;
128 * CMD640 specific registers definition.
134 #define PCMD_ENA 0x01
148 #define CFR_DEVREV 0x03
149 #define CFR_IDE01INTR 0x04
150 #define CFR_DEVID 0x18
151 #define CFR_AT_VESA_078h 0x20
152 #define CFR_DSA1 0x40
153 #define CFR_DSA0 0x80
156 #define CNTRL_DIS_RA0 0x40
157 #define CNTRL_DIS_RA1 0x80
158 #define CNTRL_ENA_2ND 0x08
165 #define ARTTIM23 0x57
166 #define ARTTIM23_DIS_RA2 0x04
167 #define ARTTIM23_DIS_RA3 0x08
168 #define DRWTIM23 0x58
172 * Registers and masks for easy access by drive index:
174 static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
175 static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
177 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
179 static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
180 static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
183 * Current cmd640 timing values for each drive.
184 * The defaults for each are the slowest possible timings.
186 static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
187 static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
188 static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
190 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
193 * These are initialized to point at the devices we control
195 static ide_hwif_t *cmd_hwif0, *cmd_hwif1;
196 static ide_drive_t *cmd_drives[4];
199 * Interface to access cmd640x registers
201 static unsigned int cmd640_key;
202 static void (*__put_cmd640_reg)(u16 reg, u8 val);
203 static u8 (*__get_cmd640_reg)(u16 reg);
206 * This is read from the CFR reg, and is used in several places.
208 static unsigned int cmd640_chip_version;
211 * The CMD640x chip does not support DWORD config write cycles, but some
212 * of the BIOSes use them to implement the config services.
213 * Therefore, we must use direct IO instead.
216 /* PCI method 1 access */
218 static void put_cmd640_reg_pci1 (u16 reg, u8 val)
220 outb_p((reg & 0xfc) | cmd640_key, 0xcf8);
221 outb_p(val, (reg & 3) | 0xcfc);
224 static u8 get_cmd640_reg_pci1 (u16 reg)
226 outb_p((reg & 0xfc) | cmd640_key, 0xcf8);
227 return inb_p((reg & 3) | 0xcfc);
230 /* PCI method 2 access (from CMD datasheet) */
232 static void put_cmd640_reg_pci2 (u16 reg, u8 val)
235 outb_p(val, cmd640_key + reg);
239 static u8 get_cmd640_reg_pci2 (u16 reg)
244 b = inb_p(cmd640_key + reg);
251 static void put_cmd640_reg_vlb (u16 reg, u8 val)
253 outb_p(reg, cmd640_key);
254 outb_p(val, cmd640_key + 4);
257 static u8 get_cmd640_reg_vlb (u16 reg)
259 outb_p(reg, cmd640_key);
260 return inb_p(cmd640_key + 4);
263 static u8 get_cmd640_reg(u16 reg)
268 spin_lock_irqsave(&ide_lock, flags);
269 b = __get_cmd640_reg(reg);
270 spin_unlock_irqrestore(&ide_lock, flags);
274 static void put_cmd640_reg(u16 reg, u8 val)
278 spin_lock_irqsave(&ide_lock, flags);
279 __put_cmd640_reg(reg,val);
280 spin_unlock_irqrestore(&ide_lock, flags);
283 static int __init match_pci_cmd640_device (void)
285 const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
287 for (i = 0; i < 4; i++) {
288 if (get_cmd640_reg(i) != ven_dev[i])
291 #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
292 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
293 printk("ide: cmd640 on PCI disabled by BIOS\n");
296 #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
297 return 1; /* success */
301 * Probe for CMD640x -- pci method 1
303 static int __init probe_for_cmd640_pci1 (void)
305 __get_cmd640_reg = get_cmd640_reg_pci1;
306 __put_cmd640_reg = put_cmd640_reg_pci1;
307 for (cmd640_key = 0x80000000;
308 cmd640_key <= 0x8000f800;
309 cmd640_key += 0x800) {
310 if (match_pci_cmd640_device())
311 return 1; /* success */
317 * Probe for CMD640x -- pci method 2
319 static int __init probe_for_cmd640_pci2 (void)
321 __get_cmd640_reg = get_cmd640_reg_pci2;
322 __put_cmd640_reg = put_cmd640_reg_pci2;
323 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
324 if (match_pci_cmd640_device())
325 return 1; /* success */
331 * Probe for CMD640x -- vlb
333 static int __init probe_for_cmd640_vlb (void)
337 __get_cmd640_reg = get_cmd640_reg_vlb;
338 __put_cmd640_reg = put_cmd640_reg_vlb;
340 b = get_cmd640_reg(CFR);
341 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
343 b = get_cmd640_reg(CFR);
344 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
347 return 1; /* success */
351 * Returns 1 if an IDE interface/drive exists at 0x170,
352 * Returns 0 otherwise.
354 static int __init secondary_port_responding (void)
358 spin_lock_irqsave(&ide_lock, flags);
360 outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */
362 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
363 outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
365 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
366 spin_unlock_irqrestore(&ide_lock, flags);
367 return 0; /* nothing responded */
370 spin_unlock_irqrestore(&ide_lock, flags);
371 return 1; /* success */
374 #ifdef CMD640_DUMP_REGS
376 * Dump out all cmd640 registers. May be called from ide.c
378 static void cmd640_dump_regs (void)
380 unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
382 /* Dump current state of chip registers */
383 printk("ide: cmd640 internal register dump:");
384 for (; reg <= 0x59; reg++) {
386 printk("\n%04x:", reg);
387 printk(" %02x", get_cmd640_reg(reg));
394 * Check whether prefetch is on for a drive,
395 * and initialize the unmask flags for safe operation.
397 static void __init check_prefetch (unsigned int index)
399 ide_drive_t *drive = cmd_drives[index];
400 u8 b = get_cmd640_reg(prefetch_regs[index]);
402 if (b & prefetch_masks[index]) { /* is prefetch off? */
403 drive->no_unmask = 0;
404 drive->no_io_32bit = 1;
407 #if CMD640_PREFETCH_MASKS
408 drive->no_unmask = 1;
411 drive->no_io_32bit = 0;
416 * Figure out which devices we control
418 static void __init setup_device_ptrs (void)
422 cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
423 cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
424 for (i = 0; i < MAX_HWIFS; i++) {
425 ide_hwif_t *hwif = &ide_hwifs[i];
426 if (hwif->chipset == ide_unknown || hwif->chipset == ide_generic) {
427 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0)
429 else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
433 cmd_drives[0] = &cmd_hwif0->drives[0];
434 cmd_drives[1] = &cmd_hwif0->drives[1];
435 cmd_drives[2] = &cmd_hwif1->drives[0];
436 cmd_drives[3] = &cmd_hwif1->drives[1];
439 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
442 * Sets prefetch mode for a drive.
444 static void set_prefetch_mode (unsigned int index, int mode)
446 ide_drive_t *drive = cmd_drives[index];
447 int reg = prefetch_regs[index];
451 spin_lock_irqsave(&ide_lock, flags);
452 b = __get_cmd640_reg(reg);
453 if (mode) { /* want prefetch on? */
454 #if CMD640_PREFETCH_MASKS
455 drive->no_unmask = 1;
458 drive->no_io_32bit = 0;
459 b &= ~prefetch_masks[index]; /* enable prefetch */
461 drive->no_unmask = 0;
462 drive->no_io_32bit = 1;
464 b |= prefetch_masks[index]; /* disable prefetch */
466 __put_cmd640_reg(reg, b);
467 spin_unlock_irqrestore(&ide_lock, flags);
471 * Dump out current drive clocks settings
473 static void display_clocks (unsigned int index)
475 u8 active_count, recovery_count;
477 active_count = active_counts[index];
478 if (active_count == 1)
480 recovery_count = recovery_counts[index];
481 if (active_count > 3 && recovery_count == 1)
483 if (cmd640_chip_version > 1)
484 recovery_count += 1; /* cmd640b uses (count + 1)*/
485 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
489 * Pack active and recovery counts into single byte representation
492 inline static u8 pack_nibbles (u8 upper, u8 lower)
494 return ((upper & 0x0f) << 4) | (lower & 0x0f);
498 * This routine retrieves the initial drive timings from the chipset.
500 static void __init retrieve_drive_counts (unsigned int index)
505 * Get the internal setup timing, and convert to clock count
507 b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
509 case 0x00: b = 4; break;
510 case 0x80: b = 3; break;
511 case 0x40: b = 2; break;
512 default: b = 5; break;
514 setup_counts[index] = b;
517 * Get the active/recovery counts
519 b = get_cmd640_reg(drwtim_regs[index]);
520 active_counts[index] = (b >> 4) ? (b >> 4) : 0x10;
521 recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
526 * This routine writes the prepared setup/active/recovery counts
527 * for a drive into the cmd640 chipset registers to active them.
529 static void program_drive_counts (unsigned int index)
532 u8 setup_count = setup_counts[index];
533 u8 active_count = active_counts[index];
534 u8 recovery_count = recovery_counts[index];
537 * Set up address setup count and drive read/write timing registers.
538 * Primary interface has individual count/timing registers for
539 * each drive. Secondary interface has one common set of registers,
540 * so we merge the timings, using the slowest value for each timing.
544 if (cmd_drives[mate = index ^ 1]->present) {
545 if (setup_count < setup_counts[mate])
546 setup_count = setup_counts[mate];
547 if (active_count < active_counts[mate])
548 active_count = active_counts[mate];
549 if (recovery_count < recovery_counts[mate])
550 recovery_count = recovery_counts[mate];
555 * Convert setup_count to internal chipset representation
557 switch (setup_count) {
558 case 4: setup_count = 0x00; break;
559 case 3: setup_count = 0x80; break;
561 case 2: setup_count = 0x40; break;
562 default: setup_count = 0xc0; /* case 5 */
566 * Now that everything is ready, program the new timings
568 spin_lock_irqsave(&ide_lock, flags);
570 * Program the address_setup clocks into ARTTIM reg,
571 * and then the active/recovery counts into the DRWTIM reg
572 * (this converts counts of 16 into counts of zero -- okay).
574 setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
575 __put_cmd640_reg(arttim_regs[index], setup_count);
576 __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
577 spin_unlock_irqrestore(&ide_lock, flags);
581 * Set a specific pio_mode for a drive
583 static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time)
585 int setup_time, active_time, recovery_time, clock_time;
586 u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
587 int bus_speed = system_bus_clock();
591 setup_time = ide_pio_timings[pio_mode].setup_time;
592 active_time = ide_pio_timings[pio_mode].active_time;
593 recovery_time = cycle_time - (setup_time + active_time);
594 clock_time = 1000 / bus_speed;
595 cycle_count = (cycle_time + clock_time - 1) / clock_time;
597 setup_count = (setup_time + clock_time - 1) / clock_time;
599 active_count = (active_time + clock_time - 1) / clock_time;
600 if (active_count < 2)
601 active_count = 2; /* minimum allowed by cmd640 */
603 recovery_count = (recovery_time + clock_time - 1) / clock_time;
604 recovery_count2 = cycle_count - (setup_count + active_count);
605 if (recovery_count2 > recovery_count)
606 recovery_count = recovery_count2;
607 if (recovery_count < 2)
608 recovery_count = 2; /* minimum allowed by cmd640 */
609 if (recovery_count > 17) {
610 active_count += recovery_count - 17;
613 if (active_count > 16)
614 active_count = 16; /* maximum allowed by cmd640 */
615 if (cmd640_chip_version > 1)
616 recovery_count -= 1; /* cmd640b uses (count + 1)*/
617 if (recovery_count > 16)
618 recovery_count = 16; /* maximum allowed by cmd640 */
620 setup_counts[index] = setup_count;
621 active_counts[index] = active_count;
622 recovery_counts[index] = recovery_count;
625 * In a perfect world, we might set the drive pio mode here
626 * (using WIN_SETFEATURE) before continuing.
628 * But we do not, because:
629 * 1) this is the wrong place to do it (proper is do_special() in ide.c)
630 * 2) in practice this is rarely, if ever, necessary
632 program_drive_counts (index);
636 * Drive PIO mode selection:
638 static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted)
642 unsigned int index = 0;
644 while (drive != cmd_drives[index]) {
646 printk("%s: bad news in cmd640_tune_drive\n", drive->name);
650 switch (mode_wanted) {
651 case 6: /* set fast-devsel off */
652 case 7: /* set fast-devsel on */
654 b = get_cmd640_reg(CNTRL) & ~0x27;
657 put_cmd640_reg(CNTRL, b);
658 printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");
661 case 8: /* set prefetch off */
662 case 9: /* set prefetch on */
664 set_prefetch_mode(index, mode_wanted);
665 printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");
669 (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d);
670 cmd640_set_mode (index, d.pio_mode, d.cycle_time);
672 printk ("%s: selected cmd640 PIO mode%d (%dns)%s",
676 d.overridden ? " (overriding vendor mode)" : "");
677 display_clocks(index);
681 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
683 static int pci_conf1(void)
688 spin_lock_irqsave(&ide_lock, flags);
691 outl(0x80000000, 0xCF8);
692 if (inl(0xCF8) == 0x80000000) {
694 spin_unlock_irqrestore(&ide_lock, flags);
698 spin_unlock_irqrestore(&ide_lock, flags);
702 static int pci_conf2(void)
706 spin_lock_irqsave(&ide_lock, flags);
710 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
711 spin_unlock_irqrestore(&ide_lock, flags);
714 spin_unlock_irqrestore(&ide_lock, flags);
719 * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c
721 static void __init ide_probe_for_cmd640x (void)
723 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
724 int second_port_toggled = 0;
725 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
726 int second_port_cmd640 = 0;
727 const char *bus_type, *port2;
731 if (cmd640_vlb && probe_for_cmd640_vlb()) {
735 /* Find out what kind of PCI probing is supported otherwise
736 we break some Adaptec cards... */
737 if (pci_conf1() && probe_for_cmd640_pci1())
738 bus_type = "PCI (type1)";
739 else if (pci_conf2() && probe_for_cmd640_pci2())
740 bus_type = "PCI (type2)";
745 * Undocumented magic (there is no 0x5b reg in specs)
747 put_cmd640_reg(0x5b, 0xbd);
748 if (get_cmd640_reg(0x5b) != 0xbd) {
749 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
752 put_cmd640_reg(0x5b, 0);
754 #ifdef CMD640_DUMP_REGS
759 * Documented magic begins here
761 cfr = get_cmd640_reg(CFR);
762 cmd640_chip_version = cfr & CFR_DEVREV;
763 if (cmd640_chip_version == 0) {
764 printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
769 * Initialize data for primary port
771 setup_device_ptrs ();
772 printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
773 cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
774 cmd_hwif0->chipset = ide_cmd640;
775 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
776 cmd_hwif0->tuneproc = &cmd640_tune_drive;
777 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
780 * Ensure compatibility by always using the slowest timings
781 * for access to the drive's command register block,
782 * and reset the prefetch burstsize to default (512 bytes).
784 * Maybe we need a way to NOT do these on *some* systems?
786 put_cmd640_reg(CMDTIM, 0);
787 put_cmd640_reg(BRST, 0x40);
790 * Try to enable the secondary interface, if not already enabled
792 if (cmd_hwif1->noprobe) {
793 port2 = "not probed";
795 b = get_cmd640_reg(CNTRL);
796 if (secondary_port_responding()) {
797 if ((b & CNTRL_ENA_2ND)) {
798 second_port_cmd640 = 1;
800 } else if (cmd640_vlb) {
801 second_port_cmd640 = 1;
804 port2 = "not cmd640";
806 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
807 if (secondary_port_responding()) {
808 second_port_cmd640 = 1;
809 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
810 second_port_toggled = 1;
811 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
814 put_cmd640_reg(CNTRL, b); /* restore original setting */
815 port2 = "not responding";
821 * Initialize data for secondary cmd640 port, if enabled
823 if (second_port_cmd640) {
824 cmd_hwif0->serialized = 1;
825 cmd_hwif1->serialized = 1;
826 cmd_hwif1->chipset = ide_cmd640;
827 cmd_hwif0->mate = cmd_hwif1;
828 cmd_hwif1->mate = cmd_hwif0;
829 cmd_hwif1->channel = 1;
830 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
831 cmd_hwif1->tuneproc = &cmd640_tune_drive;
832 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
834 printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
835 cmd_hwif0->serialized ? "" : "not ", port2);
838 * Establish initial timings/prefetch for all drives.
839 * Do not unnecessarily disturb any prior BIOS setup of these.
841 for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
842 ide_drive_t *drive = cmd_drives[index];
843 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
844 if (drive->autotune || ((index > 1) && second_port_toggled)) {
846 * Reset timing to the slowest speed and turn off prefetch.
847 * This way, the drive identify code has a better chance.
849 setup_counts [index] = 4; /* max possible */
850 active_counts [index] = 16; /* max possible */
851 recovery_counts [index] = 16; /* max possible */
852 program_drive_counts (index);
853 set_prefetch_mode (index, 0);
854 printk("cmd640: drive%d timings/prefetch cleared\n", index);
857 * Record timings/prefetch without changing them.
858 * This preserves any prior BIOS setup.
860 retrieve_drive_counts (index);
861 check_prefetch (index);
862 printk("cmd640: drive%d timings/prefetch(%s) preserved",
863 index, drive->no_io_32bit ? "off" : "on");
864 display_clocks(index);
868 * Set the drive unmask flags to match the prefetch setting
870 check_prefetch (index);
871 printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
872 index, drive->no_io_32bit ? "off" : "on");
873 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
876 #ifdef CMD640_DUMP_REGS
882 static int __init cmd640_init(void)
884 ide_register_driver(ide_probe_for_cmd640x);
889 * Called by the IDE core when compiled in and cmd640=vlb is
892 void init_cmd640_vlb(void)
897 module_init(cmd640_init);
899 MODULE_AUTHOR("See Source");
900 MODULE_DESCRIPTION("IDE support for CMD640 controller");
901 MODULE_PARM(cmd640_vlb, "i");
902 MODULE_PARM_DESC(cmd640_vlb, "Set to enable scanning for VLB controllers");
903 MODULE_LICENSE("GPL");