2 * Copyright (C) 1996 Linus Torvalds & author (see below)
5 #include <linux/module.h>
6 #include <linux/types.h>
7 #include <linux/kernel.h>
8 #include <linux/delay.h>
9 #include <linux/timer.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>
20 * Changing this #undef to #define may solve start up problems in some systems.
22 #undef ALWAYS_SET_DTC2278_PIO_MODE
25 * From: andy@cercle.cts.com (Dyan Wile)
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 :-)
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.
38 * This code was written for the DTC2278E, but might work with any of these:
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>
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.
50 static void sub22 (char b, char c)
54 for(i = 0; i < 3; ++i) {
68 static DEFINE_SPINLOCK(dtc2278_lock);
70 static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
75 spin_lock_irqsave(&dtc2278_lock, flags);
77 * This enables PIO mode4 (3?) on the first interface
81 spin_unlock_irqrestore(&dtc2278_lock, flags);
83 /* we don't know how to set it back again.. */
84 /* Actually we do - there is a data sheet available for the
85 Winbond but does anyone actually care */
89 static const struct ide_port_ops dtc2278_port_ops = {
90 .set_pio_mode = dtc2278_set_pio_mode,
93 static const struct ide_port_info dtc2278_port_info __initdata = {
94 .chipset = ide_dtc2278,
95 .port_ops = &dtc2278_port_ops,
96 .host_flags = IDE_HFLAG_SERIALIZE |
97 IDE_HFLAG_NO_UNMASK_IRQS |
99 /* disallow ->io_32bit changes */
100 IDE_HFLAG_NO_IO_32BIT |
102 IDE_HFLAG_NO_AUTOTUNE,
103 .pio_mask = ATA_PIO4,
106 static int __init dtc2278_probe(void)
110 local_irq_save(flags);
112 * This enables the second interface
118 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
120 * This enables PIO mode4 (3?) on the first interface
121 * and may solve start-up problems for some people.
126 local_irq_restore(flags);
128 return ide_legacy_device_add(&dtc2278_port_info, 0);
131 int probe_dtc2278 = 0;
133 module_param_named(probe, probe_dtc2278, bool, 0);
134 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
136 static int __init dtc2278_init(void)
138 if (probe_dtc2278 == 0)
141 if (dtc2278_probe()) {
142 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
148 module_init(dtc2278_init);
150 MODULE_AUTHOR("See Local File");
151 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
152 MODULE_LICENSE("GPL");