]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/ide/pci/cmd640.c
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 //#define CMD640_DUMP_REGS
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>
120 * This flag is set in ide.c by the parameter: ide0=cmd640_vlb
125 * CMD640 specific registers definition.
131 #define PCMD_ENA 0x01
145 #define CFR_DEVREV 0x03
146 #define CFR_IDE01INTR 0x04
147 #define CFR_DEVID 0x18
148 #define CFR_AT_VESA_078h 0x20
149 #define CFR_DSA1 0x40
150 #define CFR_DSA0 0x80
153 #define CNTRL_DIS_RA0 0x40
154 #define CNTRL_DIS_RA1 0x80
155 #define CNTRL_ENA_2ND 0x08
162 #define ARTTIM23 0x57
163 #define ARTTIM23_DIS_RA2 0x04
164 #define ARTTIM23_DIS_RA3 0x08
165 #define DRWTIM23 0x58
169 * Registers and masks for easy access by drive index:
171 static u8 prefetch_regs
[4] = {CNTRL
, CNTRL
, ARTTIM23
, ARTTIM23
};
172 static u8 prefetch_masks
[4] = {CNTRL_DIS_RA0
, CNTRL_DIS_RA1
, ARTTIM23_DIS_RA2
, ARTTIM23_DIS_RA3
};
174 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
176 static u8 arttim_regs
[4] = {ARTTIM0
, ARTTIM1
, ARTTIM23
, ARTTIM23
};
177 static u8 drwtim_regs
[4] = {DRWTIM0
, DRWTIM1
, DRWTIM23
, DRWTIM23
};
180 * Current cmd640 timing values for each drive.
181 * The defaults for each are the slowest possible timings.
183 static u8 setup_counts
[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
184 static u8 active_counts
[4] = {16, 16, 16, 16}; /* Active count (encoded) */
185 static u8 recovery_counts
[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
187 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
190 * These are initialized to point at the devices we control
192 static ide_hwif_t
*cmd_hwif0
, *cmd_hwif1
;
193 static ide_drive_t
*cmd_drives
[4];
196 * Interface to access cmd640x registers
198 static unsigned int cmd640_key
;
199 static void (*__put_cmd640_reg
)(u16 reg
, u8 val
);
200 static u8 (*__get_cmd640_reg
)(u16 reg
);
203 * This is read from the CFR reg, and is used in several places.
205 static unsigned int cmd640_chip_version
;
208 * The CMD640x chip does not support DWORD config write cycles, but some
209 * of the BIOSes use them to implement the config services.
210 * Therefore, we must use direct IO instead.
213 /* PCI method 1 access */
215 static void put_cmd640_reg_pci1 (u16 reg
, u8 val
)
217 outl_p((reg
& 0xfc) | cmd640_key
, 0xcf8);
218 outb_p(val
, (reg
& 3) | 0xcfc);
221 static u8
get_cmd640_reg_pci1 (u16 reg
)
223 outl_p((reg
& 0xfc) | cmd640_key
, 0xcf8);
224 return inb_p((reg
& 3) | 0xcfc);
227 /* PCI method 2 access (from CMD datasheet) */
229 static void put_cmd640_reg_pci2 (u16 reg
, u8 val
)
232 outb_p(val
, cmd640_key
+ reg
);
236 static u8
get_cmd640_reg_pci2 (u16 reg
)
241 b
= inb_p(cmd640_key
+ reg
);
248 static void put_cmd640_reg_vlb (u16 reg
, u8 val
)
250 outb_p(reg
, cmd640_key
);
251 outb_p(val
, cmd640_key
+ 4);
254 static u8
get_cmd640_reg_vlb (u16 reg
)
256 outb_p(reg
, cmd640_key
);
257 return inb_p(cmd640_key
+ 4);
260 static u8
get_cmd640_reg(u16 reg
)
265 spin_lock_irqsave(&ide_lock
, flags
);
266 b
= __get_cmd640_reg(reg
);
267 spin_unlock_irqrestore(&ide_lock
, flags
);
271 static void put_cmd640_reg(u16 reg
, u8 val
)
275 spin_lock_irqsave(&ide_lock
, flags
);
276 __put_cmd640_reg(reg
,val
);
277 spin_unlock_irqrestore(&ide_lock
, flags
);
280 static int __init
match_pci_cmd640_device (void)
282 const u8 ven_dev
[4] = {0x95, 0x10, 0x40, 0x06};
284 for (i
= 0; i
< 4; i
++) {
285 if (get_cmd640_reg(i
) != ven_dev
[i
])
288 #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
289 if ((get_cmd640_reg(PCMD
) & PCMD_ENA
) == 0) {
290 printk("ide: cmd640 on PCI disabled by BIOS\n");
293 #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
294 return 1; /* success */
298 * Probe for CMD640x -- pci method 1
300 static int __init
probe_for_cmd640_pci1 (void)
302 __get_cmd640_reg
= get_cmd640_reg_pci1
;
303 __put_cmd640_reg
= put_cmd640_reg_pci1
;
304 for (cmd640_key
= 0x80000000;
305 cmd640_key
<= 0x8000f800;
306 cmd640_key
+= 0x800) {
307 if (match_pci_cmd640_device())
308 return 1; /* success */
314 * Probe for CMD640x -- pci method 2
316 static int __init
probe_for_cmd640_pci2 (void)
318 __get_cmd640_reg
= get_cmd640_reg_pci2
;
319 __put_cmd640_reg
= put_cmd640_reg_pci2
;
320 for (cmd640_key
= 0xc000; cmd640_key
<= 0xcf00; cmd640_key
+= 0x100) {
321 if (match_pci_cmd640_device())
322 return 1; /* success */
328 * Probe for CMD640x -- vlb
330 static int __init
probe_for_cmd640_vlb (void)
334 __get_cmd640_reg
= get_cmd640_reg_vlb
;
335 __put_cmd640_reg
= put_cmd640_reg_vlb
;
337 b
= get_cmd640_reg(CFR
);
338 if (b
== 0xff || b
== 0x00 || (b
& CFR_AT_VESA_078h
)) {
340 b
= get_cmd640_reg(CFR
);
341 if (b
== 0xff || b
== 0x00 || !(b
& CFR_AT_VESA_078h
))
344 return 1; /* success */
348 * Returns 1 if an IDE interface/drive exists at 0x170,
349 * Returns 0 otherwise.
351 static int __init
secondary_port_responding (void)
355 spin_lock_irqsave(&ide_lock
, flags
);
357 outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET
); /* select drive0 */
359 if ((inb_p(0x170 + IDE_SELECT_OFFSET
) & 0x1f) != 0x0a) {
360 outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET
); /* select drive1 */
362 if ((inb_p(0x170 + IDE_SELECT_OFFSET
) & 0x1f) != 0x1a) {
363 spin_unlock_irqrestore(&ide_lock
, flags
);
364 return 0; /* nothing responded */
367 spin_unlock_irqrestore(&ide_lock
, flags
);
368 return 1; /* success */
371 #ifdef CMD640_DUMP_REGS
373 * Dump out all cmd640 registers. May be called from ide.c
375 static void cmd640_dump_regs (void)
377 unsigned int reg
= cmd640_vlb
? 0x50 : 0x00;
379 /* Dump current state of chip registers */
380 printk("ide: cmd640 internal register dump:");
381 for (; reg
<= 0x59; reg
++) {
383 printk("\n%04x:", reg
);
384 printk(" %02x", get_cmd640_reg(reg
));
391 * Check whether prefetch is on for a drive,
392 * and initialize the unmask flags for safe operation.
394 static void __init
check_prefetch (unsigned int index
)
396 ide_drive_t
*drive
= cmd_drives
[index
];
397 u8 b
= get_cmd640_reg(prefetch_regs
[index
]);
399 if (b
& prefetch_masks
[index
]) { /* is prefetch off? */
400 drive
->no_unmask
= 0;
401 drive
->no_io_32bit
= 1;
404 #if CMD640_PREFETCH_MASKS
405 drive
->no_unmask
= 1;
408 drive
->no_io_32bit
= 0;
413 * Figure out which devices we control
415 static void __init
setup_device_ptrs (void)
419 cmd_hwif0
= &ide_hwifs
[0]; /* default, if not found below */
420 cmd_hwif1
= &ide_hwifs
[1]; /* default, if not found below */
421 for (i
= 0; i
< MAX_HWIFS
; i
++) {
422 ide_hwif_t
*hwif
= &ide_hwifs
[i
];
423 if (hwif
->chipset
== ide_unknown
|| hwif
->chipset
== ide_forced
) {
424 if (hwif
->io_ports
[IDE_DATA_OFFSET
] == 0x1f0)
426 else if (hwif
->io_ports
[IDE_DATA_OFFSET
] == 0x170)
430 cmd_drives
[0] = &cmd_hwif0
->drives
[0];
431 cmd_drives
[1] = &cmd_hwif0
->drives
[1];
432 cmd_drives
[2] = &cmd_hwif1
->drives
[0];
433 cmd_drives
[3] = &cmd_hwif1
->drives
[1];
436 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
439 * Sets prefetch mode for a drive.
441 static void set_prefetch_mode (unsigned int index
, int mode
)
443 ide_drive_t
*drive
= cmd_drives
[index
];
444 int reg
= prefetch_regs
[index
];
448 spin_lock_irqsave(&ide_lock
, flags
);
449 b
= __get_cmd640_reg(reg
);
450 if (mode
) { /* want prefetch on? */
451 #if CMD640_PREFETCH_MASKS
452 drive
->no_unmask
= 1;
455 drive
->no_io_32bit
= 0;
456 b
&= ~prefetch_masks
[index
]; /* enable prefetch */
458 drive
->no_unmask
= 0;
459 drive
->no_io_32bit
= 1;
461 b
|= prefetch_masks
[index
]; /* disable prefetch */
463 __put_cmd640_reg(reg
, b
);
464 spin_unlock_irqrestore(&ide_lock
, flags
);
468 * Dump out current drive clocks settings
470 static void display_clocks (unsigned int index
)
472 u8 active_count
, recovery_count
;
474 active_count
= active_counts
[index
];
475 if (active_count
== 1)
477 recovery_count
= recovery_counts
[index
];
478 if (active_count
> 3 && recovery_count
== 1)
480 if (cmd640_chip_version
> 1)
481 recovery_count
+= 1; /* cmd640b uses (count + 1)*/
482 printk(", clocks=%d/%d/%d\n", setup_counts
[index
], active_count
, recovery_count
);
486 * Pack active and recovery counts into single byte representation
489 static inline u8
pack_nibbles (u8 upper
, u8 lower
)
491 return ((upper
& 0x0f) << 4) | (lower
& 0x0f);
495 * This routine retrieves the initial drive timings from the chipset.
497 static void __init
retrieve_drive_counts (unsigned int index
)
502 * Get the internal setup timing, and convert to clock count
504 b
= get_cmd640_reg(arttim_regs
[index
]) & ~0x3f;
506 case 0x00: b
= 4; break;
507 case 0x80: b
= 3; break;
508 case 0x40: b
= 2; break;
509 default: b
= 5; break;
511 setup_counts
[index
] = b
;
514 * Get the active/recovery counts
516 b
= get_cmd640_reg(drwtim_regs
[index
]);
517 active_counts
[index
] = (b
>> 4) ? (b
>> 4) : 0x10;
518 recovery_counts
[index
] = (b
& 0x0f) ? (b
& 0x0f) : 0x10;
523 * This routine writes the prepared setup/active/recovery counts
524 * for a drive into the cmd640 chipset registers to active them.
526 static void program_drive_counts (unsigned int index
)
529 u8 setup_count
= setup_counts
[index
];
530 u8 active_count
= active_counts
[index
];
531 u8 recovery_count
= recovery_counts
[index
];
534 * Set up address setup count and drive read/write timing registers.
535 * Primary interface has individual count/timing registers for
536 * each drive. Secondary interface has one common set of registers,
537 * so we merge the timings, using the slowest value for each timing.
541 if (cmd_drives
[mate
= index
^ 1]->present
) {
542 if (setup_count
< setup_counts
[mate
])
543 setup_count
= setup_counts
[mate
];
544 if (active_count
< active_counts
[mate
])
545 active_count
= active_counts
[mate
];
546 if (recovery_count
< recovery_counts
[mate
])
547 recovery_count
= recovery_counts
[mate
];
552 * Convert setup_count to internal chipset representation
554 switch (setup_count
) {
555 case 4: setup_count
= 0x00; break;
556 case 3: setup_count
= 0x80; break;
558 case 2: setup_count
= 0x40; break;
559 default: setup_count
= 0xc0; /* case 5 */
563 * Now that everything is ready, program the new timings
565 spin_lock_irqsave(&ide_lock
, flags
);
567 * Program the address_setup clocks into ARTTIM reg,
568 * and then the active/recovery counts into the DRWTIM reg
569 * (this converts counts of 16 into counts of zero -- okay).
571 setup_count
|= __get_cmd640_reg(arttim_regs
[index
]) & 0x3f;
572 __put_cmd640_reg(arttim_regs
[index
], setup_count
);
573 __put_cmd640_reg(drwtim_regs
[index
], pack_nibbles(active_count
, recovery_count
));
574 spin_unlock_irqrestore(&ide_lock
, flags
);
578 * Set a specific pio_mode for a drive
580 static void cmd640_set_mode (unsigned int index
, u8 pio_mode
, unsigned int cycle_time
)
582 int setup_time
, active_time
, recovery_time
, clock_time
;
583 u8 setup_count
, active_count
, recovery_count
, recovery_count2
, cycle_count
;
584 int bus_speed
= system_bus_clock();
588 setup_time
= ide_pio_timings
[pio_mode
].setup_time
;
589 active_time
= ide_pio_timings
[pio_mode
].active_time
;
590 recovery_time
= cycle_time
- (setup_time
+ active_time
);
591 clock_time
= 1000 / bus_speed
;
592 cycle_count
= (cycle_time
+ clock_time
- 1) / clock_time
;
594 setup_count
= (setup_time
+ clock_time
- 1) / clock_time
;
596 active_count
= (active_time
+ clock_time
- 1) / clock_time
;
597 if (active_count
< 2)
598 active_count
= 2; /* minimum allowed by cmd640 */
600 recovery_count
= (recovery_time
+ clock_time
- 1) / clock_time
;
601 recovery_count2
= cycle_count
- (setup_count
+ active_count
);
602 if (recovery_count2
> recovery_count
)
603 recovery_count
= recovery_count2
;
604 if (recovery_count
< 2)
605 recovery_count
= 2; /* minimum allowed by cmd640 */
606 if (recovery_count
> 17) {
607 active_count
+= recovery_count
- 17;
610 if (active_count
> 16)
611 active_count
= 16; /* maximum allowed by cmd640 */
612 if (cmd640_chip_version
> 1)
613 recovery_count
-= 1; /* cmd640b uses (count + 1)*/
614 if (recovery_count
> 16)
615 recovery_count
= 16; /* maximum allowed by cmd640 */
617 setup_counts
[index
] = setup_count
;
618 active_counts
[index
] = active_count
;
619 recovery_counts
[index
] = recovery_count
;
622 * In a perfect world, we might set the drive pio mode here
623 * (using WIN_SETFEATURE) before continuing.
625 * But we do not, because:
626 * 1) this is the wrong place to do it (proper is do_special() in ide.c)
627 * 2) in practice this is rarely, if ever, necessary
629 program_drive_counts (index
);
633 * Drive PIO mode selection:
635 static void cmd640_tune_drive (ide_drive_t
*drive
, u8 mode_wanted
)
639 unsigned int index
= 0;
641 while (drive
!= cmd_drives
[index
]) {
643 printk("%s: bad news in cmd640_tune_drive\n", drive
->name
);
647 switch (mode_wanted
) {
648 case 6: /* set fast-devsel off */
649 case 7: /* set fast-devsel on */
651 b
= get_cmd640_reg(CNTRL
) & ~0x27;
654 put_cmd640_reg(CNTRL
, b
);
655 printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive
->name
, mode_wanted
? "en" : "dis");
658 case 8: /* set prefetch off */
659 case 9: /* set prefetch on */
661 set_prefetch_mode(index
, mode_wanted
);
662 printk("%s: %sabled cmd640 prefetch\n", drive
->name
, mode_wanted
? "en" : "dis");
666 (void) ide_get_best_pio_mode (drive
, mode_wanted
, 5, &d
);
667 cmd640_set_mode (index
, d
.pio_mode
, d
.cycle_time
);
669 printk ("%s: selected cmd640 PIO mode%d (%dns)%s",
673 d
.overridden
? " (overriding vendor mode)" : "");
674 display_clocks(index
);
678 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
680 static int pci_conf1(void)
685 spin_lock_irqsave(&ide_lock
, flags
);
688 outl(0x80000000, 0xCF8);
689 if (inl(0xCF8) == 0x80000000) {
691 spin_unlock_irqrestore(&ide_lock
, flags
);
695 spin_unlock_irqrestore(&ide_lock
, flags
);
699 static int pci_conf2(void)
703 spin_lock_irqsave(&ide_lock
, flags
);
707 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
708 spin_unlock_irqrestore(&ide_lock
, flags
);
711 spin_unlock_irqrestore(&ide_lock
, flags
);
716 * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c
718 int __init
ide_probe_for_cmd640x (void)
720 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
721 int second_port_toggled
= 0;
722 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
723 int second_port_cmd640
= 0;
724 const char *bus_type
, *port2
;
728 if (cmd640_vlb
&& probe_for_cmd640_vlb()) {
732 /* Find out what kind of PCI probing is supported otherwise
733 Justin Gibbs will sulk.. */
734 if (pci_conf1() && probe_for_cmd640_pci1())
735 bus_type
= "PCI (type1)";
736 else if (pci_conf2() && probe_for_cmd640_pci2())
737 bus_type
= "PCI (type2)";
742 * Undocumented magic (there is no 0x5b reg in specs)
744 put_cmd640_reg(0x5b, 0xbd);
745 if (get_cmd640_reg(0x5b) != 0xbd) {
746 printk(KERN_ERR
"ide: cmd640 init failed: wrong value in reg 0x5b\n");
749 put_cmd640_reg(0x5b, 0);
751 #ifdef CMD640_DUMP_REGS
756 * Documented magic begins here
758 cfr
= get_cmd640_reg(CFR
);
759 cmd640_chip_version
= cfr
& CFR_DEVREV
;
760 if (cmd640_chip_version
== 0) {
761 printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version
);
766 * Initialize data for primary port
768 setup_device_ptrs ();
769 printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
770 cmd_hwif0
->name
, 'a' + cmd640_chip_version
- 1, bus_type
, cfr
);
771 cmd_hwif0
->chipset
= ide_cmd640
;
772 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
773 cmd_hwif0
->tuneproc
= &cmd640_tune_drive
;
774 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
777 * Ensure compatibility by always using the slowest timings
778 * for access to the drive's command register block,
779 * and reset the prefetch burstsize to default (512 bytes).
781 * Maybe we need a way to NOT do these on *some* systems?
783 put_cmd640_reg(CMDTIM
, 0);
784 put_cmd640_reg(BRST
, 0x40);
787 * Try to enable the secondary interface, if not already enabled
789 if (cmd_hwif1
->noprobe
) {
790 port2
= "not probed";
792 b
= get_cmd640_reg(CNTRL
);
793 if (secondary_port_responding()) {
794 if ((b
& CNTRL_ENA_2ND
)) {
795 second_port_cmd640
= 1;
797 } else if (cmd640_vlb
) {
798 second_port_cmd640
= 1;
801 port2
= "not cmd640";
803 put_cmd640_reg(CNTRL
, b
^ CNTRL_ENA_2ND
); /* toggle the bit */
804 if (secondary_port_responding()) {
805 second_port_cmd640
= 1;
806 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
807 second_port_toggled
= 1;
808 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
811 put_cmd640_reg(CNTRL
, b
); /* restore original setting */
812 port2
= "not responding";
818 * Initialize data for secondary cmd640 port, if enabled
820 if (second_port_cmd640
) {
821 cmd_hwif0
->serialized
= 1;
822 cmd_hwif1
->serialized
= 1;
823 cmd_hwif1
->chipset
= ide_cmd640
;
824 cmd_hwif0
->mate
= cmd_hwif1
;
825 cmd_hwif1
->mate
= cmd_hwif0
;
826 cmd_hwif1
->channel
= 1;
827 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
828 cmd_hwif1
->tuneproc
= &cmd640_tune_drive
;
829 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
831 printk(KERN_INFO
"%s: %sserialized, secondary interface %s\n", cmd_hwif1
->name
,
832 cmd_hwif0
->serialized
? "" : "not ", port2
);
835 * Establish initial timings/prefetch for all drives.
836 * Do not unnecessarily disturb any prior BIOS setup of these.
838 for (index
= 0; index
< (2 + (second_port_cmd640
<< 1)); index
++) {
839 ide_drive_t
*drive
= cmd_drives
[index
];
840 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
841 if (drive
->autotune
|| ((index
> 1) && second_port_toggled
)) {
843 * Reset timing to the slowest speed and turn off prefetch.
844 * This way, the drive identify code has a better chance.
846 setup_counts
[index
] = 4; /* max possible */
847 active_counts
[index
] = 16; /* max possible */
848 recovery_counts
[index
] = 16; /* max possible */
849 program_drive_counts (index
);
850 set_prefetch_mode (index
, 0);
851 printk("cmd640: drive%d timings/prefetch cleared\n", index
);
854 * Record timings/prefetch without changing them.
855 * This preserves any prior BIOS setup.
857 retrieve_drive_counts (index
);
858 check_prefetch (index
);
859 printk("cmd640: drive%d timings/prefetch(%s) preserved",
860 index
, drive
->no_io_32bit
? "off" : "on");
861 display_clocks(index
);
865 * Set the drive unmask flags to match the prefetch setting
867 check_prefetch (index
);
868 printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
869 index
, drive
->no_io_32bit
? "off" : "on");
870 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
873 #ifdef CMD640_DUMP_REGS