2 * linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
7 #undef REALLY_SLOW_IO /* most systems can safely undef this */
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/timer.h>
15 #include <linux/ioport.h>
16 #include <linux/blkdev.h>
17 #include <linux/hdreg.h>
18 #include <linux/ide.h>
19 #include <linux/init.h>
24 * Changing this #undef to #define may solve start up problems in some systems.
26 #undef ALWAYS_SET_DTC2278_PIO_MODE
29 * From: andy@cercle.cts.com (Dyan Wile)
31 * Below is a patch for DTC-2278 - alike software-programmable controllers
32 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
33 * the primary (EIDE). You may probably have to enable the 32-bit support to
34 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
35 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
36 * filesystem corrupted with -u1, but under heavy disk load only :-)
38 * This card is now forced to use the "serialize" feature,
39 * and irq-unmasking is disallowed. If io_32bit is enabled,
40 * it must be done for BOTH drives on each interface.
42 * This code was written for the DTC2278E, but might work with any of these:
44 * DTC2278S has only a single IDE interface.
45 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
46 * DTC2278E also has serial ports and a printer port
47 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
49 * There may be a fourth controller type. The S and D versions use the
50 * Winbond chip, and I think the E version does also.
54 static void sub22 (char b, char c)
58 for(i = 0; i < 3; ++i) {
72 static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
76 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
79 spin_lock_irqsave(&ide_lock, flags);
81 * This enables PIO mode4 (3?) on the first interface
85 spin_unlock_irqrestore(&ide_lock, flags);
87 /* we don't know how to set it back again.. */
91 * 32bit I/O has to be enabled for *both* drives at the same time.
94 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
97 static int __init probe_dtc2278(void)
100 ide_hwif_t *hwif, *mate;
102 hwif = &ide_hwifs[0];
103 mate = &ide_hwifs[1];
105 if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
108 local_irq_save(flags);
110 * This enables the second interface
116 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
118 * This enables PIO mode4 (3?) on the first interface
119 * and may solve start-up problems for some people.
124 local_irq_restore(flags);
126 hwif->serialized = 1;
127 hwif->chipset = ide_dtc2278;
128 hwif->tuneproc = &tune_dtc2278;
129 hwif->drives[0].no_unmask = 1;
130 hwif->drives[1].no_unmask = 1;
133 mate->serialized = 1;
134 mate->chipset = ide_dtc2278;
135 mate->drives[0].no_unmask = 1;
136 mate->drives[1].no_unmask = 1;
140 probe_hwif_init(hwif);
141 probe_hwif_init(mate);
143 create_proc_ide_interfaces();
148 /* Can be called directly from ide.c. */
149 int __init dtc2278_init(void)
151 if (probe_dtc2278()) {
152 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
159 module_init(dtc2278_init);
162 MODULE_AUTHOR("See Local File");
163 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
164 MODULE_LICENSE("GPL");