File: /usr/src/linux/drivers/ide/dtc2278.c
1 /*
2 * linux/drivers/ide/dtc2278.c Version 0.02 Feb 10, 1996
3 *
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
5 */
6
7 #undef REALLY_SLOW_IO /* most systems can safely undef this */
8
9 #include <linux/types.h>
10 #include <linux/kernel.h>
11 #include <linux/delay.h>
12 #include <linux/timer.h>
13 #include <linux/mm.h>
14 #include <linux/ioport.h>
15 #include <linux/blkdev.h>
16 #include <linux/hdreg.h>
17 #include <linux/ide.h>
18 #include <linux/init.h>
19
20 #include <asm/io.h>
21
22 #include "ide_modes.h"
23
24 /*
25 * Changing this #undef to #define may solve start up problems in some systems.
26 */
27 #undef ALWAYS_SET_DTC2278_PIO_MODE
28
29 /*
30 * From: andy@cercle.cts.com (Dyan Wile)
31 *
32 * Below is a patch for DTC-2278 - alike software-programmable controllers
33 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
34 * the primary (EIDE). You may probably have to enable the 32-bit support to
35 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
36 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
37 * filesystem corrupted with -u1, but under heavy disk load only :-)
38 *
39 * This card is now forced to use the "serialize" feature,
40 * and irq-unmasking is disallowed. If io_32bit is enabled,
41 * it must be done for BOTH drives on each interface.
42 *
43 * This code was written for the DTC2278E, but might work with any of these:
44 *
45 * DTC2278S has only a single IDE interface.
46 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
47 * DTC2278E also has serial ports and a printer port
48 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
49 *
50 * There may be a fourth controller type. The S and D versions use the
51 * Winbond chip, and I think the E version does also.
52 *
53 */
54
55 static void sub22 (char b, char c)
56 {
57 int i;
58
59 for(i = 0; i < 3; ++i) {
60 inb(0x3f6);
61 outb_p(b,0xb0);
62 inb(0x3f6);
63 outb_p(c,0xb4);
64 inb(0x3f6);
65 if(inb(0xb4) == c) {
66 outb_p(7,0xb0);
67 inb(0x3f6);
68 return; /* success */
69 }
70 }
71 }
72
73 static void tune_dtc2278 (ide_drive_t *drive, byte pio)
74 {
75 unsigned long flags;
76
77 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
78
79 if (pio >= 3) {
80 save_flags(flags); /* all CPUs */
81 cli(); /* all CPUs */
82 /*
83 * This enables PIO mode4 (3?) on the first interface
84 */
85 sub22(1,0xc3);
86 sub22(0,0xa0);
87 restore_flags(flags); /* all CPUs */
88 } else {
89 /* we don't know how to set it back again.. */
90 }
91
92 /*
93 * 32bit I/O has to be enabled for *both* drives at the same time.
94 */
95 drive->io_32bit = 1;
96 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
97 }
98
99 void __init init_dtc2278 (void)
100 {
101 unsigned long flags;
102
103 __save_flags(flags); /* local CPU only */
104 __cli(); /* local CPU only */
105 /*
106 * This enables the second interface
107 */
108 outb_p(4,0xb0);
109 inb(0x3f6);
110 outb_p(0x20,0xb4);
111 inb(0x3f6);
112 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
113 /*
114 * This enables PIO mode4 (3?) on the first interface
115 * and may solve start-up problems for some people.
116 */
117 sub22(1,0xc3);
118 sub22(0,0xa0);
119 #endif
120 __restore_flags(flags); /* local CPU only */
121
122 ide_hwifs[0].serialized = 1;
123 ide_hwifs[1].serialized = 1;
124 ide_hwifs[0].chipset = ide_dtc2278;
125 ide_hwifs[1].chipset = ide_dtc2278;
126 ide_hwifs[0].tuneproc = &tune_dtc2278;
127 ide_hwifs[0].drives[0].no_unmask = 1;
128 ide_hwifs[0].drives[1].no_unmask = 1;
129 ide_hwifs[1].drives[0].no_unmask = 1;
130 ide_hwifs[1].drives[1].no_unmask = 1;
131 ide_hwifs[0].mate = &ide_hwifs[1];
132 ide_hwifs[1].mate = &ide_hwifs[0];
133 ide_hwifs[1].channel = 1;
134 }
135