pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / ide / legacy / dtc2278.c
blobf165212548673729f412bbfb031aea67ba20c49c
1 /*
2 * linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
5 */
7 #include <linux/module.h>
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>
19 #include <asm/io.h>
22 * Changing this #undef to #define may solve start up problems in some systems.
24 #undef ALWAYS_SET_DTC2278_PIO_MODE
27 * From: andy@cercle.cts.com (Dyan Wile)
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 :-)
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.
40 * This code was written for the DTC2278E, but might work with any of these:
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>
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.
52 static void sub22 (char b, char c)
54 int i;
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 */
70 static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
72 unsigned long flags;
74 if (pio >= 3) {
75 spin_lock_irqsave(&ide_lock, flags);
77 * This enables PIO mode4 (3?) on the first interface
79 sub22(1,0xc3);
80 sub22(0,0xa0);
81 spin_unlock_irqrestore(&ide_lock, flags);
82 } else {
83 /* we don't know how to set it back again.. */
87 * 32bit I/O has to be enabled for *both* drives at the same time.
89 drive->io_32bit = 1;
90 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
93 static int __init dtc2278_probe(void)
95 unsigned long flags;
96 ide_hwif_t *hwif, *mate;
98 hwif = &ide_hwifs[0];
99 mate = &ide_hwifs[1];
101 if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
102 return 1;
104 local_irq_save(flags);
106 * This enables the second interface
108 outb_p(4,0xb0);
109 inb(0x3f6);
110 outb_p(0x20,0xb4);
111 inb(0x3f6);
112 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
114 * This enables PIO mode4 (3?) on the first interface
115 * and may solve start-up problems for some people.
117 sub22(1,0xc3);
118 sub22(0,0xa0);
119 #endif
120 local_irq_restore(flags);
122 hwif->serialized = 1;
123 hwif->chipset = ide_dtc2278;
124 hwif->pio_mask = ATA_PIO4;
125 hwif->set_pio_mode = &dtc2278_set_pio_mode;
126 hwif->drives[0].no_unmask = 1;
127 hwif->drives[1].no_unmask = 1;
128 hwif->mate = mate;
130 mate->serialized = 1;
131 mate->chipset = ide_dtc2278;
132 mate->drives[0].no_unmask = 1;
133 mate->drives[1].no_unmask = 1;
134 mate->mate = hwif;
135 mate->channel = 1;
137 probe_hwif_init(hwif);
138 probe_hwif_init(mate);
140 ide_proc_register_port(hwif);
141 ide_proc_register_port(mate);
143 return 0;
146 int probe_dtc2278 = 0;
148 module_param_named(probe, probe_dtc2278, bool, 0);
149 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
151 /* Can be called directly from ide.c. */
152 int __init dtc2278_init(void)
154 if (probe_dtc2278 == 0)
155 return -ENODEV;
157 if (dtc2278_probe()) {
158 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
159 return -EBUSY;
161 return 0;
164 #ifdef MODULE
165 module_init(dtc2278_init);
166 #endif
168 MODULE_AUTHOR("See Local File");
169 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
170 MODULE_LICENSE("GPL");