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1da177e4 LT |
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"); |