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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 | ||
1da177e4 | 7 | #include <linux/module.h> |
1da177e4 LT |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/timer.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/ioport.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/hdreg.h> | |
16 | #include <linux/ide.h> | |
17 | #include <linux/init.h> | |
18 | ||
19 | #include <asm/io.h> | |
20 | ||
21 | /* | |
22 | * Changing this #undef to #define may solve start up problems in some systems. | |
23 | */ | |
24 | #undef ALWAYS_SET_DTC2278_PIO_MODE | |
25 | ||
26 | /* | |
27 | * From: andy@cercle.cts.com (Dyan Wile) | |
28 | * | |
29 | * Below is a patch for DTC-2278 - alike software-programmable controllers | |
30 | * The code enables the secondary IDE controller and the PIO4 (3?) timings on | |
31 | * the primary (EIDE). You may probably have to enable the 32-bit support to | |
32 | * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 | |
33 | * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my | |
34 | * filesystem corrupted with -u1, but under heavy disk load only :-) | |
35 | * | |
36 | * This card is now forced to use the "serialize" feature, | |
37 | * and irq-unmasking is disallowed. If io_32bit is enabled, | |
38 | * it must be done for BOTH drives on each interface. | |
39 | * | |
40 | * This code was written for the DTC2278E, but might work with any of these: | |
41 | * | |
42 | * DTC2278S has only a single IDE interface. | |
43 | * DTC2278D has two IDE interfaces and is otherwise identical to the S version. | |
44 | * DTC2278E also has serial ports and a printer port | |
45 | * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> | |
46 | * | |
47 | * There may be a fourth controller type. The S and D versions use the | |
48 | * Winbond chip, and I think the E version does also. | |
49 | * | |
50 | */ | |
51 | ||
52 | static void sub22 (char b, char c) | |
53 | { | |
54 | int i; | |
55 | ||
56 | for(i = 0; i < 3; ++i) { | |
57 | inb(0x3f6); | |
58 | outb_p(b,0xb0); | |
59 | inb(0x3f6); | |
60 | outb_p(c,0xb4); | |
61 | inb(0x3f6); | |
62 | if(inb(0xb4) == c) { | |
63 | outb_p(7,0xb0); | |
64 | inb(0x3f6); | |
65 | return; /* success */ | |
66 | } | |
67 | } | |
68 | } | |
69 | ||
a34a8751 BZ |
70 | static DEFINE_SPINLOCK(dtc2278_lock); |
71 | ||
26bcb879 | 72 | static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio) |
1da177e4 LT |
73 | { |
74 | unsigned long flags; | |
75 | ||
1da177e4 | 76 | if (pio >= 3) { |
a34a8751 | 77 | spin_lock_irqsave(&dtc2278_lock, flags); |
1da177e4 LT |
78 | /* |
79 | * This enables PIO mode4 (3?) on the first interface | |
80 | */ | |
81 | sub22(1,0xc3); | |
82 | sub22(0,0xa0); | |
a34a8751 | 83 | spin_unlock_irqrestore(&dtc2278_lock, flags); |
1da177e4 LT |
84 | } else { |
85 | /* we don't know how to set it back again.. */ | |
86 | } | |
87 | ||
88 | /* | |
89 | * 32bit I/O has to be enabled for *both* drives at the same time. | |
90 | */ | |
91 | drive->io_32bit = 1; | |
92 | HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1; | |
93 | } | |
94 | ||
84913882 | 95 | static int __init dtc2278_probe(void) |
1da177e4 LT |
96 | { |
97 | unsigned long flags; | |
98 | ide_hwif_t *hwif, *mate; | |
8447d9d5 | 99 | static u8 idx[4] = { 0, 1, 0xff, 0xff }; |
1da177e4 LT |
100 | |
101 | hwif = &ide_hwifs[0]; | |
102 | mate = &ide_hwifs[1]; | |
103 | ||
104 | if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown) | |
105 | return 1; | |
106 | ||
107 | local_irq_save(flags); | |
108 | /* | |
109 | * This enables the second interface | |
110 | */ | |
111 | outb_p(4,0xb0); | |
112 | inb(0x3f6); | |
113 | outb_p(0x20,0xb4); | |
114 | inb(0x3f6); | |
115 | #ifdef ALWAYS_SET_DTC2278_PIO_MODE | |
116 | /* | |
117 | * This enables PIO mode4 (3?) on the first interface | |
118 | * and may solve start-up problems for some people. | |
119 | */ | |
120 | sub22(1,0xc3); | |
121 | sub22(0,0xa0); | |
122 | #endif | |
123 | local_irq_restore(flags); | |
124 | ||
125 | hwif->serialized = 1; | |
126 | hwif->chipset = ide_dtc2278; | |
4099d143 | 127 | hwif->pio_mask = ATA_PIO4; |
26bcb879 | 128 | hwif->set_pio_mode = &dtc2278_set_pio_mode; |
1da177e4 LT |
129 | hwif->drives[0].no_unmask = 1; |
130 | hwif->drives[1].no_unmask = 1; | |
131 | hwif->mate = mate; | |
132 | ||
133 | mate->serialized = 1; | |
134 | mate->chipset = ide_dtc2278; | |
691da768 | 135 | mate->pio_mask = ATA_PIO4; |
1da177e4 LT |
136 | mate->drives[0].no_unmask = 1; |
137 | mate->drives[1].no_unmask = 1; | |
138 | mate->mate = hwif; | |
139 | mate->channel = 1; | |
140 | ||
8447d9d5 | 141 | ide_device_add(idx); |
1da177e4 LT |
142 | |
143 | return 0; | |
144 | } | |
145 | ||
84913882 BZ |
146 | int probe_dtc2278 = 0; |
147 | ||
148 | module_param_named(probe, probe_dtc2278, bool, 0); | |
149 | MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets"); | |
150 | ||
1da177e4 LT |
151 | /* Can be called directly from ide.c. */ |
152 | int __init dtc2278_init(void) | |
153 | { | |
84913882 BZ |
154 | if (probe_dtc2278 == 0) |
155 | return -ENODEV; | |
156 | ||
157 | if (dtc2278_probe()) { | |
1da177e4 LT |
158 | printk(KERN_ERR "dtc2278: ide interfaces already in use!\n"); |
159 | return -EBUSY; | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | #ifdef MODULE | |
165 | module_init(dtc2278_init); | |
166 | #endif | |
167 | ||
168 | MODULE_AUTHOR("See Local File"); | |
169 | MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); | |
170 | MODULE_LICENSE("GPL"); |