1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
7 * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
8 * mlord@pobox.com (Mark Lord)
10 * See linux/MAINTAINERS for address of current maintainer.
12 * This file provides support for the advanced features and bugs
13 * of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
15 * These chips are basically fucked by design, and getting this driver
16 * to work on every motherboard design that uses this screwed chip seems
17 * bloody well impossible. However, we're still trying.
19 * Version 0.97 worked for everybody.
21 * User feedback is essential. Many thanks to the beta test team:
23 * A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
24 * bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
25 * chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
26 * derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
27 * flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
28 * j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
29 * kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
30 * peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
31 * s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
32 * steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
33 * liug@mama.indstate.edu, and others.
35 * Version 0.01 Initial version, hacked out of ide.c,
36 * and #include'd rather than compiled separately.
37 * This will get cleaned up in a subsequent release.
39 * Version 0.02 Fixes for vlb initialization code, enable prefetch
40 * for versions 'B' and 'C' of chip by default,
43 * Version 0.03 Added reset of secondary interface,
44 * and black list for devices which are not compatible
45 * with prefetch mode. Separate function for setting
46 * prefetch is added, possibly it will be called some
47 * day from ioctl processing code.
49 * Version 0.04 Now configs/compiles separate from ide.c
51 * Version 0.05 Major rewrite of interface timing code.
52 * Added new function cmd640_set_mode to set PIO mode
53 * from ioctl call. New drives added to black list.
55 * Version 0.06 More code cleanup. Prefetch is enabled only for
56 * detected hard drives, not included in prefetch
59 * Version 0.07 Changed to more conservative drive tuning policy.
60 * Unknown drives, which report PIO < 4 are set to
61 * (reported_PIO - 1) if it is supported, or to PIO0.
62 * List of known drives extended by info provided by
63 * CMD at their ftp site.
65 * Version 0.08 Added autotune/noautotune support.
67 * Version 0.09 Try to be smarter about 2nd port enabling.
68 * Version 0.10 Be nice and don't reset 2nd port.
69 * Version 0.11 Try to handle more weird situations.
71 * Version 0.12 Lots of bug fixes from Laszlo Peter
72 * irq unmasking disabled for reliability.
73 * try to be even smarter about the second port.
74 * tidy up source code formatting.
75 * Version 0.13 permit irq unmasking again.
76 * Version 0.90 massive code cleanup, some bugs fixed.
77 * defaults all drives to PIO mode0, prefetch off.
78 * autotune is OFF by default, with compile time flag.
79 * prefetch can be turned OFF/ON using "hdparm -p8/-p9"
80 * (requires hdparm-3.1 or newer)
81 * Version 0.91 first release to linux-kernel list.
82 * Version 0.92 move initial reg dump to separate callable function
83 * change "readahead" to "prefetch" to avoid confusion
84 * Version 0.95 respect original BIOS timings unless autotuning.
85 * tons of code cleanup and rearrangement.
86 * added CONFIG_BLK_DEV_CMD640_ENHANCED option
87 * prevent use of unmask when prefetch is on
88 * Version 0.96 prevent use of io_32bit when prefetch is off
89 * Version 0.97 fix VLB secondary interface for sjd@slip.net
90 * other minor tune-ups: 0.96 was very good.
91 * Version 0.98 ignore PCI version when disabled by BIOS
92 * Version 0.99 display setup/active/recovery clocks with PIO mode
93 * Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems
94 * Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7"
95 * ("fast" is necessary for 32bit I/O in some systems)
96 * Version 1.02 fix bug that resulted in slow "setup times"
97 * (patch courtesy of Zoltan Hidvegi)
100 #define CMD640_PREFETCH_MASKS 1
102 /*#define CMD640_DUMP_REGS */
104 #include <linux/types.h>
105 #include <linux/kernel.h>
106 #include <linux/delay.h>
107 #include <linux/ide.h>
108 #include <linux/init.h>
109 #include <linux/module.h>
113 #define DRV_NAME "cmd640"
115 static bool cmd640_vlb;
118 * CMD640 specific registers definition.
124 #define PCMD_ENA 0x01
138 #define CFR_DEVREV 0x03
139 #define CFR_IDE01INTR 0x04
140 #define CFR_DEVID 0x18
141 #define CFR_AT_VESA_078h 0x20
142 #define CFR_DSA1 0x40
143 #define CFR_DSA0 0x80
146 #define CNTRL_DIS_RA0 0x40
147 #define CNTRL_DIS_RA1 0x80
148 #define CNTRL_ENA_2ND 0x08
155 #define ARTTIM23 0x57
156 #define ARTTIM23_DIS_RA2 0x04
157 #define ARTTIM23_DIS_RA3 0x08
158 #define ARTTIM23_IDE23INTR 0x10
159 #define DRWTIM23 0x58
163 * Registers and masks for easy access by drive index:
165 static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
166 static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
168 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
170 static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
171 static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
174 * Current cmd640 timing values for each drive.
175 * The defaults for each are the slowest possible timings.
177 static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
178 static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
179 static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
181 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
183 static DEFINE_SPINLOCK(cmd640_lock);
186 * Interface to access cmd640x registers
188 static unsigned int cmd640_key;
189 static void (*__put_cmd640_reg)(u16 reg, u8 val);
190 static u8 (*__get_cmd640_reg)(u16 reg);
193 * This is read from the CFR reg, and is used in several places.
195 static unsigned int cmd640_chip_version;
198 * The CMD640x chip does not support DWORD config write cycles, but some
199 * of the BIOSes use them to implement the config services.
200 * Therefore, we must use direct IO instead.
203 /* PCI method 1 access */
205 static void put_cmd640_reg_pci1(u16 reg, u8 val)
207 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
208 outb_p(val, (reg & 3) | 0xcfc);
211 static u8 get_cmd640_reg_pci1(u16 reg)
213 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
214 return inb_p((reg & 3) | 0xcfc);
217 /* PCI method 2 access (from CMD datasheet) */
219 static void put_cmd640_reg_pci2(u16 reg, u8 val)
222 outb_p(val, cmd640_key + reg);
226 static u8 get_cmd640_reg_pci2(u16 reg)
231 b = inb_p(cmd640_key + reg);
238 static void put_cmd640_reg_vlb(u16 reg, u8 val)
240 outb_p(reg, cmd640_key);
241 outb_p(val, cmd640_key + 4);
244 static u8 get_cmd640_reg_vlb(u16 reg)
246 outb_p(reg, cmd640_key);
247 return inb_p(cmd640_key + 4);
250 static u8 get_cmd640_reg(u16 reg)
255 spin_lock_irqsave(&cmd640_lock, flags);
256 b = __get_cmd640_reg(reg);
257 spin_unlock_irqrestore(&cmd640_lock, flags);
261 static void put_cmd640_reg(u16 reg, u8 val)
265 spin_lock_irqsave(&cmd640_lock, flags);
266 __put_cmd640_reg(reg, val);
267 spin_unlock_irqrestore(&cmd640_lock, flags);
270 static int __init match_pci_cmd640_device(void)
272 const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
274 for (i = 0; i < 4; i++) {
275 if (get_cmd640_reg(i) != ven_dev[i])
278 #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
279 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
280 printk("ide: cmd640 on PCI disabled by BIOS\n");
283 #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
284 return 1; /* success */
288 * Probe for CMD640x -- pci method 1
290 static int __init probe_for_cmd640_pci1(void)
292 __get_cmd640_reg = get_cmd640_reg_pci1;
293 __put_cmd640_reg = put_cmd640_reg_pci1;
294 for (cmd640_key = 0x80000000;
295 cmd640_key <= 0x8000f800;
296 cmd640_key += 0x800) {
297 if (match_pci_cmd640_device())
298 return 1; /* success */
304 * Probe for CMD640x -- pci method 2
306 static int __init probe_for_cmd640_pci2(void)
308 __get_cmd640_reg = get_cmd640_reg_pci2;
309 __put_cmd640_reg = put_cmd640_reg_pci2;
310 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
311 if (match_pci_cmd640_device())
312 return 1; /* success */
318 * Probe for CMD640x -- vlb
320 static int __init probe_for_cmd640_vlb(void)
324 __get_cmd640_reg = get_cmd640_reg_vlb;
325 __put_cmd640_reg = put_cmd640_reg_vlb;
327 b = get_cmd640_reg(CFR);
328 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
330 b = get_cmd640_reg(CFR);
331 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
334 return 1; /* success */
338 * Returns 1 if an IDE interface/drive exists at 0x170,
339 * Returns 0 otherwise.
341 static int __init secondary_port_responding(void)
345 spin_lock_irqsave(&cmd640_lock, flags);
347 outb_p(0x0a, 0x176); /* select drive0 */
349 if ((inb_p(0x176) & 0x1f) != 0x0a) {
350 outb_p(0x1a, 0x176); /* select drive1 */
352 if ((inb_p(0x176) & 0x1f) != 0x1a) {
353 spin_unlock_irqrestore(&cmd640_lock, flags);
354 return 0; /* nothing responded */
357 spin_unlock_irqrestore(&cmd640_lock, flags);
358 return 1; /* success */
361 #ifdef CMD640_DUMP_REGS
363 * Dump out all cmd640 registers. May be called from ide.c
365 static void cmd640_dump_regs(void)
367 unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
369 /* Dump current state of chip registers */
370 printk("ide: cmd640 internal register dump:");
371 for (; reg <= 0x59; reg++) {
373 printk("\n%04x:", reg);
374 printk(" %02x", get_cmd640_reg(reg));
380 static void __set_prefetch_mode(ide_drive_t *drive, int mode)
382 if (mode) { /* want prefetch on? */
383 #if CMD640_PREFETCH_MASKS
384 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
385 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
387 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
389 drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
390 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
395 #ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
397 * Check whether prefetch is on for a drive,
398 * and initialize the unmask flags for safe operation.
400 static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
402 u8 b = get_cmd640_reg(prefetch_regs[index]);
404 __set_prefetch_mode(drive, (b & prefetch_masks[index]) ? 0 : 1);
409 * Sets prefetch mode for a drive.
411 static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
414 int reg = prefetch_regs[index];
417 spin_lock_irqsave(&cmd640_lock, flags);
418 b = __get_cmd640_reg(reg);
419 __set_prefetch_mode(drive, mode);
421 b &= ~prefetch_masks[index]; /* enable prefetch */
423 b |= prefetch_masks[index]; /* disable prefetch */
424 __put_cmd640_reg(reg, b);
425 spin_unlock_irqrestore(&cmd640_lock, flags);
429 * Dump out current drive clocks settings
431 static void display_clocks(unsigned int index)
433 u8 active_count, recovery_count;
435 active_count = active_counts[index];
436 if (active_count == 1)
438 recovery_count = recovery_counts[index];
439 if (active_count > 3 && recovery_count == 1)
441 if (cmd640_chip_version > 1)
442 recovery_count += 1; /* cmd640b uses (count + 1)*/
443 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
447 * Pack active and recovery counts into single byte representation
450 static inline u8 pack_nibbles(u8 upper, u8 lower)
452 return ((upper & 0x0f) << 4) | (lower & 0x0f);
456 * This routine writes the prepared setup/active/recovery counts
457 * for a drive into the cmd640 chipset registers to active them.
459 static void program_drive_counts(ide_drive_t *drive, unsigned int index)
462 u8 setup_count = setup_counts[index];
463 u8 active_count = active_counts[index];
464 u8 recovery_count = recovery_counts[index];
467 * Set up address setup count and drive read/write timing registers.
468 * Primary interface has individual count/timing registers for
469 * each drive. Secondary interface has one common set of registers,
470 * so we merge the timings, using the slowest value for each timing.
473 ide_drive_t *peer = ide_get_pair_dev(drive);
474 unsigned int mate = index ^ 1;
477 if (setup_count < setup_counts[mate])
478 setup_count = setup_counts[mate];
479 if (active_count < active_counts[mate])
480 active_count = active_counts[mate];
481 if (recovery_count < recovery_counts[mate])
482 recovery_count = recovery_counts[mate];
487 * Convert setup_count to internal chipset representation
489 switch (setup_count) {
490 case 4: setup_count = 0x00; break;
491 case 3: setup_count = 0x80; break;
493 case 2: setup_count = 0x40; break;
494 default: setup_count = 0xc0; /* case 5 */
498 * Now that everything is ready, program the new timings
500 spin_lock_irqsave(&cmd640_lock, flags);
502 * Program the address_setup clocks into ARTTIM reg,
503 * and then the active/recovery counts into the DRWTIM reg
504 * (this converts counts of 16 into counts of zero -- okay).
506 setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
507 __put_cmd640_reg(arttim_regs[index], setup_count);
508 __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
509 spin_unlock_irqrestore(&cmd640_lock, flags);
513 * Set a specific pio_mode for a drive
515 static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
516 u8 pio_mode, unsigned int cycle_time)
518 struct ide_timing *t;
519 int setup_time, active_time, recovery_time, clock_time;
520 u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
524 bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
526 bus_speed = ide_pci_clk ? ide_pci_clk : 33;
531 t = ide_timing_find_mode(XFER_PIO_0 + pio_mode);
532 setup_time = t->setup;
533 active_time = t->active;
535 recovery_time = cycle_time - (setup_time + active_time);
536 clock_time = 1000 / bus_speed;
537 cycle_count = DIV_ROUND_UP(cycle_time, clock_time);
539 setup_count = DIV_ROUND_UP(setup_time, clock_time);
541 active_count = DIV_ROUND_UP(active_time, clock_time);
542 if (active_count < 2)
543 active_count = 2; /* minimum allowed by cmd640 */
545 recovery_count = DIV_ROUND_UP(recovery_time, clock_time);
546 recovery_count2 = cycle_count - (setup_count + active_count);
547 if (recovery_count2 > recovery_count)
548 recovery_count = recovery_count2;
549 if (recovery_count < 2)
550 recovery_count = 2; /* minimum allowed by cmd640 */
551 if (recovery_count > 17) {
552 active_count += recovery_count - 17;
555 if (active_count > 16)
556 active_count = 16; /* maximum allowed by cmd640 */
557 if (cmd640_chip_version > 1)
558 recovery_count -= 1; /* cmd640b uses (count + 1)*/
559 if (recovery_count > 16)
560 recovery_count = 16; /* maximum allowed by cmd640 */
562 setup_counts[index] = setup_count;
563 active_counts[index] = active_count;
564 recovery_counts[index] = recovery_count;
567 * In a perfect world, we might set the drive pio mode here
568 * (using WIN_SETFEATURE) before continuing.
570 * But we do not, because:
571 * 1) this is the wrong place to do it (proper is do_special() in ide.c)
572 * 2) in practice this is rarely, if ever, necessary
574 program_drive_counts(drive, index);
577 static void cmd640_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
579 unsigned int index = 0, cycle_time;
580 const u8 pio = drive->pio_mode - XFER_PIO_0;
584 case 6: /* set fast-devsel off */
585 case 7: /* set fast-devsel on */
586 b = get_cmd640_reg(CNTRL) & ~0x27;
589 put_cmd640_reg(CNTRL, b);
590 printk("%s: %sabled cmd640 fast host timing (devsel)\n",
591 drive->name, (pio & 1) ? "en" : "dis");
593 case 8: /* set prefetch off */
594 case 9: /* set prefetch on */
595 set_prefetch_mode(drive, index, pio & 1);
596 printk("%s: %sabled cmd640 prefetch\n",
597 drive->name, (pio & 1) ? "en" : "dis");
601 cycle_time = ide_pio_cycle_time(drive, pio);
602 cmd640_set_mode(drive, index, pio, cycle_time);
604 printk("%s: selected cmd640 PIO mode%d (%dns)",
605 drive->name, pio, cycle_time);
607 display_clocks(index);
609 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
611 static void __init cmd640_init_dev(ide_drive_t *drive)
613 unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);
615 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
617 * Reset timing to the slowest speed and turn off prefetch.
618 * This way, the drive identify code has a better chance.
620 setup_counts[i] = 4; /* max possible */
621 active_counts[i] = 16; /* max possible */
622 recovery_counts[i] = 16; /* max possible */
623 program_drive_counts(drive, i);
624 set_prefetch_mode(drive, i, 0);
625 printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch cleared\n", i);
628 * Set the drive unmask flags to match the prefetch setting.
630 check_prefetch(drive, i);
631 printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch(%s) preserved\n",
632 i, (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) ? "off" : "on");
633 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
636 static int cmd640_test_irq(ide_hwif_t *hwif)
638 int irq_reg = hwif->channel ? ARTTIM23 : CFR;
639 u8 irq_mask = hwif->channel ? ARTTIM23_IDE23INTR :
641 u8 irq_stat = get_cmd640_reg(irq_reg);
643 return (irq_stat & irq_mask) ? 1 : 0;
646 static const struct ide_port_ops cmd640_port_ops = {
647 .init_dev = cmd640_init_dev,
648 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
649 .set_pio_mode = cmd640_set_pio_mode,
651 .test_irq = cmd640_test_irq,
654 static int pci_conf1(void)
659 spin_lock_irqsave(&cmd640_lock, flags);
662 outl(0x80000000, 0xCF8);
663 if (inl(0xCF8) == 0x80000000) {
665 spin_unlock_irqrestore(&cmd640_lock, flags);
669 spin_unlock_irqrestore(&cmd640_lock, flags);
673 static int pci_conf2(void)
677 spin_lock_irqsave(&cmd640_lock, flags);
681 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
682 spin_unlock_irqrestore(&cmd640_lock, flags);
685 spin_unlock_irqrestore(&cmd640_lock, flags);
689 static const struct ide_port_info cmd640_port_info __initconst = {
690 .chipset = ide_cmd640,
691 .host_flags = IDE_HFLAG_SERIALIZE |
693 IDE_HFLAG_ABUSE_PREFETCH |
694 IDE_HFLAG_ABUSE_FAST_DEVSEL,
695 .port_ops = &cmd640_port_ops,
696 .pio_mask = ATA_PIO5,
699 static int __init cmd640x_init_one(unsigned long base, unsigned long ctl)
701 if (!request_region(base, 8, DRV_NAME)) {
702 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
703 DRV_NAME, base, base + 7);
707 if (!request_region(ctl, 1, DRV_NAME)) {
708 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
710 release_region(base, 8);
718 * Probe for a cmd640 chipset, and initialize it if found.
720 static int __init cmd640x_init(void)
722 int second_port_cmd640 = 0, rc;
723 const char *bus_type, *port2;
725 struct ide_hw hw[2], *hws[2];
727 if (cmd640_vlb && probe_for_cmd640_vlb()) {
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)";
741 * Undocumented magic (there is no 0x5b reg in specs)
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");
748 put_cmd640_reg(0x5b, 0);
750 #ifdef CMD640_DUMP_REGS
755 * Documented magic begins here
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);
764 rc = cmd640x_init_one(0x1f0, 0x3f6);
768 rc = cmd640x_init_one(0x170, 0x376);
770 release_region(0x3f6, 1);
771 release_region(0x1f0, 8);
775 memset(&hw, 0, sizeof(hw));
777 ide_std_init_ports(&hw[0], 0x1f0, 0x3f6);
780 ide_std_init_ports(&hw[1], 0x170, 0x376);
783 printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
784 "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
787 * Initialize data for primary port
792 * Ensure compatibility by always using the slowest timings
793 * for access to the drive's command register block,
794 * and reset the prefetch burstsize to default (512 bytes).
796 * Maybe we need a way to NOT do these on *some* systems?
798 put_cmd640_reg(CMDTIM, 0);
799 put_cmd640_reg(BRST, 0x40);
801 b = get_cmd640_reg(CNTRL);
804 * Try to enable the secondary interface, if not already enabled
806 if (secondary_port_responding()) {
807 if ((b & CNTRL_ENA_2ND)) {
808 second_port_cmd640 = 1;
810 } else if (cmd640_vlb) {
811 second_port_cmd640 = 1;
814 port2 = "not cmd640";
816 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
817 if (secondary_port_responding()) {
818 second_port_cmd640 = 1;
821 put_cmd640_reg(CNTRL, b); /* restore original setting */
822 port2 = "not responding";
827 * Initialize data for secondary cmd640 port, if enabled
829 if (second_port_cmd640)
832 printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
833 second_port_cmd640 ? "" : "not ", port2);
835 #ifdef CMD640_DUMP_REGS
839 return ide_host_add(&cmd640_port_info, hws, second_port_cmd640 ? 2 : 1,
843 module_param_named(probe_vlb, cmd640_vlb, bool, 0);
844 MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");
846 module_init(cmd640x_init);
848 MODULE_LICENSE("GPL");