aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/legacy/dtc2278.c
blob: 6c01d951d074cacb7ef9c4e4b6fc68f424ec8adc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 *  linux/drivers/ide/legacy/dtc2278.c		Version 0.02	Feb 10, 1996
 *
 *  Copyright (C) 1996  Linus Torvalds & author (see below)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/io.h>

/*
 * Changing this #undef to #define may solve start up problems in some systems.
 */
#undef ALWAYS_SET_DTC2278_PIO_MODE

/*
 * From: andy@cercle.cts.com (Dyan Wile)
 *
 * Below is a patch for DTC-2278 - alike software-programmable controllers
 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
 * the primary (EIDE). You may probably have to enable the 32-bit support to
 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
 * filesystem  corrupted with -u1, but under heavy disk load only :-)
 *
 * This card is now forced to use the "serialize" feature,
 * and irq-unmasking is disallowed.  If io_32bit is enabled,
 * it must be done for BOTH drives on each interface.
 *
 * This code was written for the DTC2278E, but might work with any of these:
 *
 * DTC2278S has only a single IDE interface.
 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
 * DTC2278E also has serial ports and a printer port
 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
 *
 * There may be a fourth controller type. The S and D versions use the
 * Winbond chip, and I think the E version does also.
 *
 */

static void sub22 (char b, char c)
{
	int i;

	for(i = 0; i < 3; ++i) {
		inb(0x3f6);
		outb_p(b,0xb0);
		inb(0x3f6);
		outb_p(c,0xb4);
		inb(0x3f6);
		if(inb(0xb4) == c) {
			outb_p(7,0xb0);
			inb(0x3f6);
			return;	/* success */
		}
	}
}

static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
{
	unsigned long flags;

	pio = ide_get_best_pio_mode(drive, pio, 4);

	if (pio >= 3) {
		spin_lock_irqsave(&ide_lock, flags);
		/*
		 * This enables PIO mode4 (3?) on the first interface
		 */
		sub22(1,0xc3);
		sub22(0,0xa0);
		spin_unlock_irqrestore(&ide_lock, flags);
	} else {
		/* we don't know how to set it back again.. */
	}

	/*
	 * 32bit I/O has to be enabled for *both* drives at the same time.
	 */
	drive->io_32bit = 1;
	HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
}

static int __init dtc2278_probe(void)
{
	unsigned long flags;
	ide_hwif_t *hwif, *mate;

	hwif = &ide_hwifs[0];
	mate = &ide_hwifs[1];

	if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
		return 1;

	local_irq_save(flags);
	/*
	 * This enables the second interface
	 */
	outb_p(4,0xb0);
	inb(0x3f6);
	outb_p(0x20,0xb4);
	inb(0x3f6);
#ifdef ALWAYS_SET_DTC2278_PIO_MODE
	/*
	 * This enables PIO mode4 (3?) on the first interface
	 * and may solve start-up problems for some people.
	 */
	sub22(1,0xc3);
	sub22(0,0xa0);
#endif
	local_irq_restore(flags);

	hwif->serialized = 1;
	hwif->chipset = ide_dtc2278;
	hwif->pio_mask = ATA_PIO4;
	hwif->tuneproc = &tune_dtc2278;
	hwif->drives[0].no_unmask = 1;
	hwif->drives[1].no_unmask = 1;
	hwif->mate = mate;

	mate->serialized = 1;
	mate->chipset = ide_dtc2278;
	mate->drives[0].no_unmask = 1;
	mate->drives[1].no_unmask = 1;
	mate->mate = hwif;
	mate->channel = 1;

	probe_hwif_init(hwif);
	probe_hwif_init(mate);

	ide_proc_register_port(hwif);
	ide_proc_register_port(mate);

	return 0;
}

int probe_dtc2278 = 0;

module_param_named(probe, probe_dtc2278, bool, 0);
MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");

/* Can be called directly from ide.c. */
int __init dtc2278_init(void)
{
	if (probe_dtc2278 == 0)
		return -ENODEV;

	if (dtc2278_probe()) {
		printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
		return -EBUSY;
	}
	return 0;
}

#ifdef MODULE
module_init(dtc2278_init);
#endif

MODULE_AUTHOR("See Local File");
MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
MODULE_LICENSE("GPL");