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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1996 Linus Torvalds & author (see below) |
3 | */ | |
4 | ||
1da177e4 | 5 | #include <linux/module.h> |
1da177e4 LT |
6 | #include <linux/types.h> |
7 | #include <linux/kernel.h> | |
8 | #include <linux/delay.h> | |
9 | #include <linux/timer.h> | |
10 | #include <linux/mm.h> | |
11 | #include <linux/ioport.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/hdreg.h> | |
14 | #include <linux/ide.h> | |
15 | #include <linux/init.h> | |
16 | ||
17 | #include <asm/io.h> | |
18 | ||
19 | /* | |
20 | * Changing this #undef to #define may solve start up problems in some systems. | |
21 | */ | |
22 | #undef ALWAYS_SET_DTC2278_PIO_MODE | |
23 | ||
24 | /* | |
25 | * From: andy@cercle.cts.com (Dyan Wile) | |
26 | * | |
27 | * Below is a patch for DTC-2278 - alike software-programmable controllers | |
28 | * The code enables the secondary IDE controller and the PIO4 (3?) timings on | |
29 | * the primary (EIDE). You may probably have to enable the 32-bit support to | |
30 | * get the full speed. You better get the disk interrupts disabled ( hdparm -u0 | |
31 | * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my | |
32 | * filesystem corrupted with -u1, but under heavy disk load only :-) | |
33 | * | |
34 | * This card is now forced to use the "serialize" feature, | |
35 | * and irq-unmasking is disallowed. If io_32bit is enabled, | |
36 | * it must be done for BOTH drives on each interface. | |
37 | * | |
38 | * This code was written for the DTC2278E, but might work with any of these: | |
39 | * | |
40 | * DTC2278S has only a single IDE interface. | |
41 | * DTC2278D has two IDE interfaces and is otherwise identical to the S version. | |
42 | * DTC2278E also has serial ports and a printer port | |
43 | * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu> | |
44 | * | |
45 | * There may be a fourth controller type. The S and D versions use the | |
46 | * Winbond chip, and I think the E version does also. | |
47 | * | |
48 | */ | |
49 | ||
50 | static void sub22 (char b, char c) | |
51 | { | |
52 | int i; | |
53 | ||
54 | for(i = 0; i < 3; ++i) { | |
55 | inb(0x3f6); | |
56 | outb_p(b,0xb0); | |
57 | inb(0x3f6); | |
58 | outb_p(c,0xb4); | |
59 | inb(0x3f6); | |
60 | if(inb(0xb4) == c) { | |
61 | outb_p(7,0xb0); | |
62 | inb(0x3f6); | |
63 | return; /* success */ | |
64 | } | |
65 | } | |
66 | } | |
67 | ||
a34a8751 BZ |
68 | static DEFINE_SPINLOCK(dtc2278_lock); |
69 | ||
26bcb879 | 70 | static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio) |
1da177e4 LT |
71 | { |
72 | unsigned long flags; | |
73 | ||
1da177e4 | 74 | if (pio >= 3) { |
a34a8751 | 75 | spin_lock_irqsave(&dtc2278_lock, flags); |
1da177e4 LT |
76 | /* |
77 | * This enables PIO mode4 (3?) on the first interface | |
78 | */ | |
79 | sub22(1,0xc3); | |
80 | sub22(0,0xa0); | |
a34a8751 | 81 | spin_unlock_irqrestore(&dtc2278_lock, flags); |
1da177e4 LT |
82 | } else { |
83 | /* we don't know how to set it back again.. */ | |
d3bad45f AC |
84 | /* Actually we do - there is a data sheet available for the |
85 | Winbond but does anyone actually care */ | |
1da177e4 | 86 | } |
1da177e4 LT |
87 | } |
88 | ||
ac95beed BZ |
89 | static const struct ide_port_ops dtc2278_port_ops = { |
90 | .set_pio_mode = dtc2278_set_pio_mode, | |
91 | }; | |
92 | ||
c413b9b9 BZ |
93 | static const struct ide_port_info dtc2278_port_info __initdata = { |
94 | .chipset = ide_dtc2278, | |
ac95beed | 95 | .port_ops = &dtc2278_port_ops, |
c413b9b9 | 96 | .host_flags = IDE_HFLAG_SERIALIZE | |
807b90d0 | 97 | IDE_HFLAG_NO_UNMASK_IRQS | |
c413b9b9 | 98 | IDE_HFLAG_IO_32BIT | |
807b90d0 BZ |
99 | /* disallow ->io_32bit changes */ |
100 | IDE_HFLAG_NO_IO_32BIT | | |
c413b9b9 BZ |
101 | IDE_HFLAG_NO_DMA | |
102 | IDE_HFLAG_NO_AUTOTUNE, | |
103 | .pio_mask = ATA_PIO4, | |
104 | }; | |
105 | ||
84913882 | 106 | static int __init dtc2278_probe(void) |
1da177e4 LT |
107 | { |
108 | unsigned long flags; | |
1da177e4 | 109 | |
1da177e4 LT |
110 | local_irq_save(flags); |
111 | /* | |
112 | * This enables the second interface | |
113 | */ | |
114 | outb_p(4,0xb0); | |
115 | inb(0x3f6); | |
116 | outb_p(0x20,0xb4); | |
117 | inb(0x3f6); | |
118 | #ifdef ALWAYS_SET_DTC2278_PIO_MODE | |
119 | /* | |
120 | * This enables PIO mode4 (3?) on the first interface | |
121 | * and may solve start-up problems for some people. | |
122 | */ | |
123 | sub22(1,0xc3); | |
124 | sub22(0,0xa0); | |
125 | #endif | |
126 | local_irq_restore(flags); | |
127 | ||
0bfeee7d | 128 | return ide_legacy_device_add(&dtc2278_port_info, 0); |
1da177e4 LT |
129 | } |
130 | ||
84913882 BZ |
131 | int probe_dtc2278 = 0; |
132 | ||
133 | module_param_named(probe, probe_dtc2278, bool, 0); | |
134 | MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets"); | |
135 | ||
ade2daf9 | 136 | static int __init dtc2278_init(void) |
1da177e4 | 137 | { |
84913882 BZ |
138 | if (probe_dtc2278 == 0) |
139 | return -ENODEV; | |
140 | ||
141 | if (dtc2278_probe()) { | |
1da177e4 LT |
142 | printk(KERN_ERR "dtc2278: ide interfaces already in use!\n"); |
143 | return -EBUSY; | |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
1da177e4 | 148 | module_init(dtc2278_init); |
1da177e4 LT |
149 | |
150 | MODULE_AUTHOR("See Local File"); | |
151 | MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets"); | |
152 | MODULE_LICENSE("GPL"); |