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 DEFINE_SPINLOCK(dtc2278_lock);
72 static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
77 spin_lock_irqsave(&dtc2278_lock, flags);
79 * This enables PIO mode4 (3?) on the first interface
83 spin_unlock_irqrestore(&dtc2278_lock, flags);
85 /* we don't know how to set it back again.. */
86 /* Actually we do - there is a data sheet available for the
87 Winbond but does anyone actually care */
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 dtc2278_probe(void)
100 ide_hwif_t *hwif, *mate;
101 static u8 idx[4] = { 0, 1, 0xff, 0xff };
103 hwif = &ide_hwifs[0];
104 mate = &ide_hwifs[1];
106 if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
109 local_irq_save(flags);
111 * This enables the second interface
117 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
119 * This enables PIO mode4 (3?) on the first interface
120 * and may solve start-up problems for some people.
125 local_irq_restore(flags);
127 hwif->serialized = 1;
128 hwif->chipset = ide_dtc2278;
129 hwif->pio_mask = ATA_PIO4;
130 hwif->set_pio_mode = &dtc2278_set_pio_mode;
131 hwif->drives[0].no_unmask = 1;
132 hwif->drives[1].no_unmask = 1;
135 mate->serialized = 1;
136 mate->chipset = ide_dtc2278;
137 mate->pio_mask = ATA_PIO4;
138 mate->drives[0].no_unmask = 1;
139 mate->drives[1].no_unmask = 1;
148 int probe_dtc2278 = 0;
150 module_param_named(probe, probe_dtc2278, bool, 0);
151 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
153 static 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");
165 module_init(dtc2278_init);
167 MODULE_AUTHOR("See Local File");
168 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
169 MODULE_LICENSE("GPL");