2 * linux/drivers/ide/legacy/dtc2278.c Version 0.02 Feb 10, 1996
4 * Copyright (C) 1996 Linus Torvalds & author (see below)
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>
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>
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)
56 for(i = 0; i < 3; ++i) {
70 static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
74 pio = ide_get_best_pio_mode(drive, pio, 4);
77 spin_lock_irqsave(&ide_lock, flags);
79 * This enables PIO mode4 (3?) on the first interface
83 spin_unlock_irqrestore(&ide_lock, flags);
85 /* we don't know how to set it back again.. */
89 * 32bit I/O has to be enabled for *both* drives at the same time.
92 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
95 static int __init dtc2278_probe(void)
98 ide_hwif_t *hwif, *mate;
100 hwif = &ide_hwifs[0];
101 mate = &ide_hwifs[1];
103 if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
106 local_irq_save(flags);
108 * This enables the second interface
114 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
116 * This enables PIO mode4 (3?) on the first interface
117 * and may solve start-up problems for some people.
122 local_irq_restore(flags);
124 hwif->serialized = 1;
125 hwif->chipset = ide_dtc2278;
126 hwif->tuneproc = &tune_dtc2278;
127 hwif->drives[0].no_unmask = 1;
128 hwif->drives[1].no_unmask = 1;
131 mate->serialized = 1;
132 mate->chipset = ide_dtc2278;
133 mate->drives[0].no_unmask = 1;
134 mate->drives[1].no_unmask = 1;
138 probe_hwif_init(hwif);
139 probe_hwif_init(mate);
141 ide_proc_register_port(hwif);
142 ide_proc_register_port(mate);
147 int probe_dtc2278 = 0;
149 module_param_named(probe, probe_dtc2278, bool, 0);
150 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
152 /* Can be called directly from ide.c. */
153 int __init dtc2278_init(void)
155 if (probe_dtc2278 == 0)
158 if (dtc2278_probe()) {
159 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
166 module_init(dtc2278_init);
169 MODULE_AUTHOR("See Local File");
170 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
171 MODULE_LICENSE("GPL");