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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
3 */
4
5/*
6 * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +02007 * mlord@pobox.com (Mark Lord)
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * See linux/MAINTAINERS for address of current maintainer.
10 *
11 * This file provides support for the advanced features and bugs
12 * of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
13 *
14 * These chips are basically fucked by design, and getting this driver
15 * to work on every motherboard design that uses this screwed chip seems
16 * bloody well impossible. However, we're still trying.
17 *
18 * Version 0.97 worked for everybody.
19 *
20 * User feedback is essential. Many thanks to the beta test team:
21 *
22 * A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
23 * bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
24 * chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
25 * derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
26 * flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
27 * j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
28 * kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
29 * peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
30 * s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
31 * steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
32 * liug@mama.indstate.edu, and others.
33 *
34 * Version 0.01 Initial version, hacked out of ide.c,
35 * and #include'd rather than compiled separately.
36 * This will get cleaned up in a subsequent release.
37 *
38 * Version 0.02 Fixes for vlb initialization code, enable prefetch
39 * for versions 'B' and 'C' of chip by default,
40 * some code cleanup.
41 *
42 * Version 0.03 Added reset of secondary interface,
43 * and black list for devices which are not compatible
44 * with prefetch mode. Separate function for setting
45 * prefetch is added, possibly it will be called some
46 * day from ioctl processing code.
47 *
48 * Version 0.04 Now configs/compiles separate from ide.c
49 *
50 * Version 0.05 Major rewrite of interface timing code.
51 * Added new function cmd640_set_mode to set PIO mode
52 * from ioctl call. New drives added to black list.
53 *
54 * Version 0.06 More code cleanup. Prefetch is enabled only for
55 * detected hard drives, not included in prefetch
56 * black list.
57 *
58 * Version 0.07 Changed to more conservative drive tuning policy.
59 * Unknown drives, which report PIO < 4 are set to
60 * (reported_PIO - 1) if it is supported, or to PIO0.
61 * List of known drives extended by info provided by
62 * CMD at their ftp site.
63 *
64 * Version 0.08 Added autotune/noautotune support.
65 *
66 * Version 0.09 Try to be smarter about 2nd port enabling.
67 * Version 0.10 Be nice and don't reset 2nd port.
68 * Version 0.11 Try to handle more weird situations.
69 *
70 * Version 0.12 Lots of bug fixes from Laszlo Peter
71 * irq unmasking disabled for reliability.
72 * try to be even smarter about the second port.
73 * tidy up source code formatting.
74 * Version 0.13 permit irq unmasking again.
75 * Version 0.90 massive code cleanup, some bugs fixed.
76 * defaults all drives to PIO mode0, prefetch off.
77 * autotune is OFF by default, with compile time flag.
78 * prefetch can be turned OFF/ON using "hdparm -p8/-p9"
79 * (requires hdparm-3.1 or newer)
80 * Version 0.91 first release to linux-kernel list.
81 * Version 0.92 move initial reg dump to separate callable function
82 * change "readahead" to "prefetch" to avoid confusion
83 * Version 0.95 respect original BIOS timings unless autotuning.
84 * tons of code cleanup and rearrangement.
85 * added CONFIG_BLK_DEV_CMD640_ENHANCED option
86 * prevent use of unmask when prefetch is on
87 * Version 0.96 prevent use of io_32bit when prefetch is off
88 * Version 0.97 fix VLB secondary interface for sjd@slip.net
89 * other minor tune-ups: 0.96 was very good.
90 * Version 0.98 ignore PCI version when disabled by BIOS
91 * Version 0.99 display setup/active/recovery clocks with PIO mode
92 * Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems
93 * Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7"
94 * ("fast" is necessary for 32bit I/O in some systems)
95 * Version 1.02 fix bug that resulted in slow "setup times"
96 * (patch courtesy of Zoltan Hidvegi)
97 */
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#define CMD640_PREFETCH_MASKS 1
100
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200101/*#define CMD640_DUMP_REGS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103#include <linux/types.h>
104#include <linux/kernel.h>
105#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#include <linux/ide.h>
107#include <linux/init.h>
108
109#include <asm/io.h>
110
Bartlomiej Zolnierkiewicz7ebe5932008-04-26 22:25:19 +0200111#define DRV_NAME "cmd640"
112
Bartlomiej Zolnierkiewiczef87f8d2008-04-27 15:38:24 +0200113static int cmd640_vlb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115/*
116 * CMD640 specific registers definition.
117 */
118
119#define VID 0x00
120#define DID 0x02
121#define PCMD 0x04
122#define PCMD_ENA 0x01
123#define PSTTS 0x06
124#define REVID 0x08
125#define PROGIF 0x09
126#define SUBCL 0x0a
127#define BASCL 0x0b
128#define BaseA0 0x10
129#define BaseA1 0x14
130#define BaseA2 0x18
131#define BaseA3 0x1c
132#define INTLINE 0x3c
133#define INPINE 0x3d
134
135#define CFR 0x50
136#define CFR_DEVREV 0x03
137#define CFR_IDE01INTR 0x04
138#define CFR_DEVID 0x18
139#define CFR_AT_VESA_078h 0x20
140#define CFR_DSA1 0x40
141#define CFR_DSA0 0x80
142
143#define CNTRL 0x51
144#define CNTRL_DIS_RA0 0x40
145#define CNTRL_DIS_RA1 0x80
146#define CNTRL_ENA_2ND 0x08
147
148#define CMDTIM 0x52
149#define ARTTIM0 0x53
150#define DRWTIM0 0x54
151#define ARTTIM1 0x55
152#define DRWTIM1 0x56
153#define ARTTIM23 0x57
154#define ARTTIM23_DIS_RA2 0x04
155#define ARTTIM23_DIS_RA3 0x08
156#define DRWTIM23 0x58
157#define BRST 0x59
158
159/*
160 * Registers and masks for easy access by drive index:
161 */
162static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
163static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
164
165#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
166
167static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
168static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
169
170/*
171 * Current cmd640 timing values for each drive.
172 * The defaults for each are the slowest possible timings.
173 */
174static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
175static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
176static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
177
178#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
179
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200180static DEFINE_SPINLOCK(cmd640_lock);
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 * Interface to access cmd640x registers
184 */
185static unsigned int cmd640_key;
186static void (*__put_cmd640_reg)(u16 reg, u8 val);
187static u8 (*__get_cmd640_reg)(u16 reg);
188
189/*
190 * This is read from the CFR reg, and is used in several places.
191 */
192static unsigned int cmd640_chip_version;
193
194/*
195 * The CMD640x chip does not support DWORD config write cycles, but some
196 * of the BIOSes use them to implement the config services.
197 * Therefore, we must use direct IO instead.
198 */
199
200/* PCI method 1 access */
201
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200202static void put_cmd640_reg_pci1(u16 reg, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
204 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
205 outb_p(val, (reg & 3) | 0xcfc);
206}
207
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200208static u8 get_cmd640_reg_pci1(u16 reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
210 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
211 return inb_p((reg & 3) | 0xcfc);
212}
213
214/* PCI method 2 access (from CMD datasheet) */
215
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200216static void put_cmd640_reg_pci2(u16 reg, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 outb_p(0x10, 0xcf8);
219 outb_p(val, cmd640_key + reg);
220 outb_p(0, 0xcf8);
221}
222
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200223static u8 get_cmd640_reg_pci2(u16 reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 u8 b;
226
227 outb_p(0x10, 0xcf8);
228 b = inb_p(cmd640_key + reg);
229 outb_p(0, 0xcf8);
230 return b;
231}
232
233/* VLB access */
234
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200235static void put_cmd640_reg_vlb(u16 reg, u8 val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 outb_p(reg, cmd640_key);
238 outb_p(val, cmd640_key + 4);
239}
240
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200241static u8 get_cmd640_reg_vlb(u16 reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
243 outb_p(reg, cmd640_key);
244 return inb_p(cmd640_key + 4);
245}
246
247static u8 get_cmd640_reg(u16 reg)
248{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 unsigned long flags;
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200250 u8 b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200252 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 b = __get_cmd640_reg(reg);
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200254 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return b;
256}
257
258static void put_cmd640_reg(u16 reg, u8 val)
259{
260 unsigned long flags;
261
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200262 spin_lock_irqsave(&cmd640_lock, flags);
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200263 __put_cmd640_reg(reg, val);
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200264 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200267static int __init match_pci_cmd640_device(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
269 const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
270 unsigned int i;
271 for (i = 0; i < 4; i++) {
272 if (get_cmd640_reg(i) != ven_dev[i])
273 return 0;
274 }
275#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
276 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
277 printk("ide: cmd640 on PCI disabled by BIOS\n");
278 return 0;
279 }
280#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
281 return 1; /* success */
282}
283
284/*
285 * Probe for CMD640x -- pci method 1
286 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200287static int __init probe_for_cmd640_pci1(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 __get_cmd640_reg = get_cmd640_reg_pci1;
290 __put_cmd640_reg = put_cmd640_reg_pci1;
291 for (cmd640_key = 0x80000000;
292 cmd640_key <= 0x8000f800;
293 cmd640_key += 0x800) {
294 if (match_pci_cmd640_device())
295 return 1; /* success */
296 }
297 return 0;
298}
299
300/*
301 * Probe for CMD640x -- pci method 2
302 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200303static int __init probe_for_cmd640_pci2(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
305 __get_cmd640_reg = get_cmd640_reg_pci2;
306 __put_cmd640_reg = put_cmd640_reg_pci2;
307 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
308 if (match_pci_cmd640_device())
309 return 1; /* success */
310 }
311 return 0;
312}
313
314/*
315 * Probe for CMD640x -- vlb
316 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200317static int __init probe_for_cmd640_vlb(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 u8 b;
320
321 __get_cmd640_reg = get_cmd640_reg_vlb;
322 __put_cmd640_reg = put_cmd640_reg_vlb;
323 cmd640_key = 0x178;
324 b = get_cmd640_reg(CFR);
325 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
326 cmd640_key = 0x78;
327 b = get_cmd640_reg(CFR);
328 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
329 return 0;
330 }
331 return 1; /* success */
332}
333
334/*
335 * Returns 1 if an IDE interface/drive exists at 0x170,
336 * Returns 0 otherwise.
337 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200338static int __init secondary_port_responding(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339{
340 unsigned long flags;
341
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200342 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200344 outb_p(0x0a, 0x176); /* select drive0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 udelay(100);
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200346 if ((inb_p(0x176) & 0x1f) != 0x0a) {
347 outb_p(0x1a, 0x176); /* select drive1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 udelay(100);
Bartlomiej Zolnierkiewicz4c3032d2008-04-27 15:38:32 +0200349 if ((inb_p(0x176) & 0x1f) != 0x1a) {
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200350 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return 0; /* nothing responded */
352 }
353 }
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200354 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return 1; /* success */
356}
357
358#ifdef CMD640_DUMP_REGS
359/*
360 * Dump out all cmd640 registers. May be called from ide.c
361 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200362static void cmd640_dump_regs(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
364 unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
365
366 /* Dump current state of chip registers */
367 printk("ide: cmd640 internal register dump:");
368 for (; reg <= 0x59; reg++) {
369 if (!(reg & 0x0f))
370 printk("\n%04x:", reg);
371 printk(" %02x", get_cmd640_reg(reg));
372 }
373 printk("\n");
374}
375#endif
376
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200377static void __set_prefetch_mode(ide_drive_t *drive, int mode)
378{
379 if (mode) { /* want prefetch on? */
380#if CMD640_PREFETCH_MASKS
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200381 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
382 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200383#endif
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200384 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200385 } else {
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200386 drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
387 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200388 drive->io_32bit = 0;
389 }
390}
391
Bartlomiej Zolnierkiewiczbdffe5d2008-04-27 15:38:29 +0200392#ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393/*
394 * Check whether prefetch is on for a drive,
395 * and initialize the unmask flags for safe operation.
396 */
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200397static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 u8 b = get_cmd640_reg(prefetch_regs[index]);
400
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200401 __set_prefetch_mode(drive, (b & prefetch_masks[index]) ? 0 : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
Bartlomiej Zolnierkiewiczbdffe5d2008-04-27 15:38:29 +0200403#else
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405/*
406 * Sets prefetch mode for a drive.
407 */
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200408static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409{
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200410 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 int reg = prefetch_regs[index];
412 u8 b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200414 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 b = __get_cmd640_reg(reg);
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200416 __set_prefetch_mode(drive, mode);
417 if (mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 b &= ~prefetch_masks[index]; /* enable prefetch */
Bartlomiej Zolnierkiewiczaf5dfe82008-10-10 22:39:28 +0200419 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 b |= prefetch_masks[index]; /* disable prefetch */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 __put_cmd640_reg(reg, b);
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200422 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
425/*
426 * Dump out current drive clocks settings
427 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200428static void display_clocks(unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 u8 active_count, recovery_count;
431
432 active_count = active_counts[index];
433 if (active_count == 1)
434 ++active_count;
435 recovery_count = recovery_counts[index];
436 if (active_count > 3 && recovery_count == 1)
437 ++recovery_count;
438 if (cmd640_chip_version > 1)
439 recovery_count += 1; /* cmd640b uses (count + 1)*/
440 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
441}
442
443/*
444 * Pack active and recovery counts into single byte representation
445 * used by controller
446 */
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200447static inline u8 pack_nibbles(u8 upper, u8 lower)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448{
449 return ((upper & 0x0f) << 4) | (lower & 0x0f);
450}
451
452/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 * This routine writes the prepared setup/active/recovery counts
454 * for a drive into the cmd640 chipset registers to active them.
455 */
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200456static void program_drive_counts(ide_drive_t *drive, unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457{
458 unsigned long flags;
459 u8 setup_count = setup_counts[index];
460 u8 active_count = active_counts[index];
461 u8 recovery_count = recovery_counts[index];
462
463 /*
464 * Set up address setup count and drive read/write timing registers.
465 * Primary interface has individual count/timing registers for
466 * each drive. Secondary interface has one common set of registers,
467 * so we merge the timings, using the slowest value for each timing.
468 */
469 if (index > 1) {
Bartlomiej Zolnierkiewicz2b78ff52009-01-06 17:20:55 +0100470 ide_drive_t *peer = ide_get_pair_dev(drive);
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200471 unsigned int mate = index ^ 1;
472
Bartlomiej Zolnierkiewicz2b78ff52009-01-06 17:20:55 +0100473 if (peer) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 if (setup_count < setup_counts[mate])
475 setup_count = setup_counts[mate];
476 if (active_count < active_counts[mate])
477 active_count = active_counts[mate];
478 if (recovery_count < recovery_counts[mate])
479 recovery_count = recovery_counts[mate];
480 }
481 }
482
483 /*
484 * Convert setup_count to internal chipset representation
485 */
486 switch (setup_count) {
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200487 case 4: setup_count = 0x00; break;
488 case 3: setup_count = 0x80; break;
489 case 1:
490 case 2: setup_count = 0x40; break;
491 default: setup_count = 0xc0; /* case 5 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 }
493
494 /*
495 * Now that everything is ready, program the new timings
496 */
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200497 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 /*
499 * Program the address_setup clocks into ARTTIM reg,
500 * and then the active/recovery counts into the DRWTIM reg
501 * (this converts counts of 16 into counts of zero -- okay).
502 */
503 setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
504 __put_cmd640_reg(arttim_regs[index], setup_count);
505 __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200506 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
509/*
510 * Set a specific pio_mode for a drive
511 */
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200512static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
513 u8 pio_mode, unsigned int cycle_time)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
Bartlomiej Zolnierkiewicz17b500d2008-07-16 20:33:38 +0200515 struct ide_timing *t;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 int setup_time, active_time, recovery_time, clock_time;
517 u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
Bartlomiej Zolnierkiewiczebae41a2008-04-27 15:38:29 +0200518 int bus_speed;
519
Bartlomiej Zolnierkiewicz30e5ee42008-07-15 21:21:46 +0200520 if (cmd640_vlb)
521 bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
Bartlomiej Zolnierkiewiczebae41a2008-04-27 15:38:29 +0200522 else
Bartlomiej Zolnierkiewicz30e5ee42008-07-15 21:21:46 +0200523 bus_speed = ide_pci_clk ? ide_pci_clk : 33;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
525 if (pio_mode > 5)
526 pio_mode = 5;
Bartlomiej Zolnierkiewicz17b500d2008-07-16 20:33:38 +0200527
528 t = ide_timing_find_mode(XFER_PIO_0 + pio_mode);
529 setup_time = t->setup;
530 active_time = t->active;
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 recovery_time = cycle_time - (setup_time + active_time);
533 clock_time = 1000 / bus_speed;
Julia Lawall00fe8b72008-04-26 17:36:35 +0200534 cycle_count = DIV_ROUND_UP(cycle_time, clock_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Julia Lawall00fe8b72008-04-26 17:36:35 +0200536 setup_count = DIV_ROUND_UP(setup_time, clock_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Julia Lawall00fe8b72008-04-26 17:36:35 +0200538 active_count = DIV_ROUND_UP(active_time, clock_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (active_count < 2)
540 active_count = 2; /* minimum allowed by cmd640 */
541
Julia Lawall00fe8b72008-04-26 17:36:35 +0200542 recovery_count = DIV_ROUND_UP(recovery_time, clock_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 recovery_count2 = cycle_count - (setup_count + active_count);
544 if (recovery_count2 > recovery_count)
545 recovery_count = recovery_count2;
546 if (recovery_count < 2)
547 recovery_count = 2; /* minimum allowed by cmd640 */
548 if (recovery_count > 17) {
549 active_count += recovery_count - 17;
550 recovery_count = 17;
551 }
552 if (active_count > 16)
553 active_count = 16; /* maximum allowed by cmd640 */
554 if (cmd640_chip_version > 1)
555 recovery_count -= 1; /* cmd640b uses (count + 1)*/
556 if (recovery_count > 16)
557 recovery_count = 16; /* maximum allowed by cmd640 */
558
559 setup_counts[index] = setup_count;
560 active_counts[index] = active_count;
561 recovery_counts[index] = recovery_count;
562
563 /*
564 * In a perfect world, we might set the drive pio mode here
565 * (using WIN_SETFEATURE) before continuing.
566 *
567 * But we do not, because:
568 * 1) this is the wrong place to do it (proper is do_special() in ide.c)
569 * 2) in practice this is rarely, if ever, necessary
570 */
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200571 program_drive_counts(drive, index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572}
573
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200574static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575{
Bartlomiej Zolnierkiewicz7dd00082007-07-20 01:11:56 +0200576 unsigned int index = 0, cycle_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 u8 b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200579 switch (pio) {
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200580 case 6: /* set fast-devsel off */
581 case 7: /* set fast-devsel on */
582 b = get_cmd640_reg(CNTRL) & ~0x27;
583 if (pio & 1)
584 b |= 0x27;
585 put_cmd640_reg(CNTRL, b);
586 printk("%s: %sabled cmd640 fast host timing (devsel)\n",
587 drive->name, (pio & 1) ? "en" : "dis");
588 return;
589 case 8: /* set prefetch off */
590 case 9: /* set prefetch on */
591 set_prefetch_mode(drive, index, pio & 1);
592 printk("%s: %sabled cmd640 prefetch\n",
593 drive->name, (pio & 1) ? "en" : "dis");
594 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
596
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200597 cycle_time = ide_pio_cycle_time(drive, pio);
Bartlomiej Zolnierkiewicz95230762008-04-26 17:36:33 +0200598 cmd640_set_mode(drive, index, pio, cycle_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Bartlomiej Zolnierkiewicz342cdb62007-07-20 01:11:55 +0200600 printk("%s: selected cmd640 PIO mode%d (%dns)",
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200601 drive->name, pio, cycle_time);
Bartlomiej Zolnierkiewicz342cdb62007-07-20 01:11:55 +0200602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 display_clocks(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
Bartlomiej Zolnierkiewiczb48c89a2008-07-16 20:33:42 +0200605#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
606
607static void cmd640_init_dev(ide_drive_t *drive)
608{
Bartlomiej Zolnierkiewicz123995b2008-10-13 21:39:40 +0200609 unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);
Bartlomiej Zolnierkiewiczb48c89a2008-07-16 20:33:42 +0200610
611#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
612 /*
613 * Reset timing to the slowest speed and turn off prefetch.
614 * This way, the drive identify code has a better chance.
615 */
616 setup_counts[i] = 4; /* max possible */
617 active_counts[i] = 16; /* max possible */
618 recovery_counts[i] = 16; /* max possible */
619 program_drive_counts(drive, i);
620 set_prefetch_mode(drive, i, 0);
621 printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch cleared\n", i);
622#else
623 /*
624 * Set the drive unmask flags to match the prefetch setting.
625 */
626 check_prefetch(drive, i);
627 printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch(%s) preserved\n",
Bartlomiej Zolnierkiewicz97100fc2008-10-13 21:39:36 +0200628 i, (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) ? "off" : "on");
Bartlomiej Zolnierkiewiczb48c89a2008-07-16 20:33:42 +0200629#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
630}
631
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200633static const struct ide_port_ops cmd640_port_ops = {
Bartlomiej Zolnierkiewiczb48c89a2008-07-16 20:33:42 +0200634 .init_dev = cmd640_init_dev,
635#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200636 .set_pio_mode = cmd640_set_pio_mode,
Bartlomiej Zolnierkiewiczb48c89a2008-07-16 20:33:42 +0200637#endif
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200638};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640static int pci_conf1(void)
641{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 unsigned long flags;
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200643 u32 tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200645 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 outb(0x01, 0xCFB);
647 tmp = inl(0xCF8);
648 outl(0x80000000, 0xCF8);
649 if (inl(0xCF8) == 0x80000000) {
650 outl(tmp, 0xCF8);
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200651 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return 1;
653 }
654 outl(tmp, 0xCF8);
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200655 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 return 0;
657}
658
659static int pci_conf2(void)
660{
661 unsigned long flags;
662
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200663 spin_lock_irqsave(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 outb(0x00, 0xCFB);
665 outb(0x00, 0xCF8);
666 outb(0x00, 0xCFA);
667 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200668 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 return 1;
670 }
Bartlomiej Zolnierkiewicz5bbcf922007-10-20 00:32:35 +0200671 spin_unlock_irqrestore(&cmd640_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 return 0;
673}
674
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100675static const struct ide_port_info cmd640_port_info __initdata = {
676 .chipset = ide_cmd640,
677 .host_flags = IDE_HFLAG_SERIALIZE |
678 IDE_HFLAG_NO_DMA |
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100679 IDE_HFLAG_ABUSE_PREFETCH |
680 IDE_HFLAG_ABUSE_FAST_DEVSEL,
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +0200681 .port_ops = &cmd640_port_ops,
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100682 .pio_mask = ATA_PIO5,
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100683};
684
Bartlomiej Zolnierkiewicz7ebe5932008-04-26 22:25:19 +0200685static int cmd640x_init_one(unsigned long base, unsigned long ctl)
686{
687 if (!request_region(base, 8, DRV_NAME)) {
688 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
689 DRV_NAME, base, base + 7);
690 return -EBUSY;
691 }
692
693 if (!request_region(ctl, 1, DRV_NAME)) {
694 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
695 DRV_NAME, ctl);
696 release_region(base, 8);
697 return -EBUSY;
698 }
699
700 return 0;
701}
702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703/*
Bartlomiej Zolnierkiewiczade2daf2008-01-26 20:13:07 +0100704 * Probe for a cmd640 chipset, and initialize it if found.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 */
Bartlomiej Zolnierkiewiczade2daf2008-01-26 20:13:07 +0100706static int __init cmd640x_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
Bartlomiej Zolnierkiewicz7ebe5932008-04-26 22:25:19 +0200708 int second_port_cmd640 = 0, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 const char *bus_type, *port2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 u8 b, cfr;
Bartlomiej Zolnierkiewicz9f36d312009-05-17 19:12:25 +0200711 struct ide_hw hw[2], *hws[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (cmd640_vlb && probe_for_cmd640_vlb()) {
714 bus_type = "VLB";
715 } else {
716 cmd640_vlb = 0;
717 /* Find out what kind of PCI probing is supported otherwise
718 Justin Gibbs will sulk.. */
719 if (pci_conf1() && probe_for_cmd640_pci1())
720 bus_type = "PCI (type1)";
721 else if (pci_conf2() && probe_for_cmd640_pci2())
722 bus_type = "PCI (type2)";
723 else
724 return 0;
725 }
726 /*
727 * Undocumented magic (there is no 0x5b reg in specs)
728 */
729 put_cmd640_reg(0x5b, 0xbd);
730 if (get_cmd640_reg(0x5b) != 0xbd) {
731 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
732 return 0;
733 }
734 put_cmd640_reg(0x5b, 0);
735
736#ifdef CMD640_DUMP_REGS
737 cmd640_dump_regs();
738#endif
739
740 /*
741 * Documented magic begins here
742 */
743 cfr = get_cmd640_reg(CFR);
744 cmd640_chip_version = cfr & CFR_DEVREV;
745 if (cmd640_chip_version == 0) {
Paolo Ciarrocchi4752b5e2008-04-26 17:36:41 +0200746 printk("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return 0;
748 }
749
Bartlomiej Zolnierkiewicz7ebe5932008-04-26 22:25:19 +0200750 rc = cmd640x_init_one(0x1f0, 0x3f6);
751 if (rc)
752 return rc;
753
754 rc = cmd640x_init_one(0x170, 0x376);
755 if (rc) {
756 release_region(0x3f6, 1);
757 release_region(0x1f0, 8);
758 return rc;
759 }
760
Bartlomiej Zolnierkiewicz6d3803b2008-04-18 00:46:34 +0200761 memset(&hw, 0, sizeof(hw));
762
763 ide_std_init_ports(&hw[0], 0x1f0, 0x3f6);
764 hw[0].irq = 14;
765
766 ide_std_init_ports(&hw[1], 0x170, 0x376);
767 hw[1].irq = 15;
768
769 printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
770 "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
771
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 /*
773 * Initialize data for primary port
774 */
Bartlomiej Zolnierkiewicz48c3c102008-07-23 19:55:57 +0200775 hws[0] = &hw[0];
Bartlomiej Zolnierkiewicz8ac4ce72008-01-26 20:13:06 +0100776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 /*
778 * Ensure compatibility by always using the slowest timings
779 * for access to the drive's command register block,
780 * and reset the prefetch burstsize to default (512 bytes).
781 *
782 * Maybe we need a way to NOT do these on *some* systems?
783 */
784 put_cmd640_reg(CMDTIM, 0);
785 put_cmd640_reg(BRST, 0x40);
786
Bartlomiej Zolnierkiewicza6984002008-07-16 20:33:41 +0200787 b = get_cmd640_reg(CNTRL);
Bartlomiej Zolnierkiewicz84f05df2008-04-26 17:36:33 +0200788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 /*
790 * Try to enable the secondary interface, if not already enabled
791 */
Bartlomiej Zolnierkiewicza6984002008-07-16 20:33:41 +0200792 if (secondary_port_responding()) {
793 if ((b & CNTRL_ENA_2ND)) {
794 second_port_cmd640 = 1;
795 port2 = "okay";
796 } else if (cmd640_vlb) {
797 second_port_cmd640 = 1;
798 port2 = "alive";
799 } else
800 port2 = "not cmd640";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 } else {
Bartlomiej Zolnierkiewicza6984002008-07-16 20:33:41 +0200802 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 if (secondary_port_responding()) {
Bartlomiej Zolnierkiewicza6984002008-07-16 20:33:41 +0200804 second_port_cmd640 = 1;
805 port2 = "enabled";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 } else {
Bartlomiej Zolnierkiewicza6984002008-07-16 20:33:41 +0200807 put_cmd640_reg(CNTRL, b); /* restore original setting */
808 port2 = "not responding";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 }
810 }
811
812 /*
813 * Initialize data for secondary cmd640 port, if enabled
814 */
Bartlomiej Zolnierkiewicz48c3c102008-07-23 19:55:57 +0200815 if (second_port_cmd640)
816 hws[1] = &hw[1];
817
Bartlomiej Zolnierkiewicz84f05df2008-04-26 17:36:33 +0200818 printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100819 second_port_cmd640 ? "" : "not ", port2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821#ifdef CMD640_DUMP_REGS
822 cmd640_dump_regs();
823#endif
Bartlomiej Zolnierkiewicz8ac4ce72008-01-26 20:13:06 +0100824
Bartlomiej Zolnierkiewiczdca39832009-05-17 19:12:24 +0200825 return ide_host_add(&cmd640_port_info, hws, second_port_cmd640 ? 2 : 1,
826 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
828
Bartlomiej Zolnierkiewiczade2daf2008-01-26 20:13:07 +0100829module_param_named(probe_vlb, cmd640_vlb, bool, 0);
830MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");
831
832module_init(cmd640x_init);
Adrian Bunk776c0bc2008-04-02 21:22:02 +0200833
834MODULE_LICENSE("GPL");