1 /*
2 * linux/drivers/ide/legacy/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/module.h>
10 #include <linux/config.h>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/timer.h>
15 #include <linux/mm.h>
16 #include <linux/ioport.h>
17 #include <linux/blkdev.h>
18 #include <linux/hdreg.h>
19 #include <linux/ide.h>
20 #include <linux/init.h>
21
22 #include <asm/io.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, u8 pio)
74 {
75 unsigned long flags;
76
77 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
78
79 if (pio >= 3) {
80 spin_lock_irqsave(&ide_lock, flags);
81 /*
82 * This enables PIO mode4 (3?) on the first interface
83 */
84 sub22(1,0xc3);
85 sub22(0,0xa0);
86 spin_unlock_irqrestore(&ide_lock, flags);
87 } else {
88 /* we don't know how to set it back again.. */
89 }
90
91 /*
92 * 32bit I/O has to be enabled for *both* drives at the same time.
93 */
94 drive->io_32bit = 1;
95 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
96 }
97
98 static int __init probe_dtc2278(void)
99 {
100 unsigned long flags;
101 ide_hwif_t *hwif, *mate;
102
103 hwif = &ide_hwifs[0];
104 mate = &ide_hwifs[1];
105
106 if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
107 return 1;
108
109 local_irq_save(flags);
110 /*
111 * This enables the second interface
112 */
113 outb_p(4,0xb0);
114 inb(0x3f6);
115 outb_p(0x20,0xb4);
116 inb(0x3f6);
117 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
118 /*
119 * This enables PIO mode4 (3?) on the first interface
120 * and may solve start-up problems for some people.
121 */
122 sub22(1,0xc3);
123 sub22(0,0xa0);
124 #endif
125 local_irq_restore(flags);
126
127 hwif->serialized = 1;
128 hwif->chipset = ide_dtc2278;
129 hwif->tuneproc = &tune_dtc2278;
130 hwif->drives[0].no_unmask = 1;
131 hwif->drives[1].no_unmask = 1;
132 hwif->mate = mate;
133
134 mate->serialized = 1;
135 mate->chipset = ide_dtc2278;
136 mate->drives[0].no_unmask = 1;
137 mate->drives[1].no_unmask = 1;
138 mate->mate = hwif;
139 mate->channel = 1;
140
141 probe_hwif_init(hwif);
142 probe_hwif_init(mate);
143
144 create_proc_ide_interfaces();
145
146 return 0;
147 }
148
149 /* Can be called directly from ide.c. */
150 int __init dtc2278_init(void)
151 {
152 if (probe_dtc2278()) {
153 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
154 return -EBUSY;
155 }
156 return 0;
157 }
158
159 #ifdef MODULE
160 module_init(dtc2278_init);
161 #endif
162
163 MODULE_AUTHOR("See Local File");
164 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
165 MODULE_LICENSE("GPL");
166
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