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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 1996 Linus Torvalds & author (see below)
3 */
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/types.h>
7#include <linux/kernel.h>
8#include <linux/delay.h>
9#include <linux/timer.h>
10#include <linux/mm.h>
11#include <linux/ioport.h>
12#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/ide.h>
14#include <linux/init.h>
15
16#include <asm/io.h>
17
Bartlomiej Zolnierkiewiczd92f1a22008-04-26 22:25:18 +020018#define DRV_NAME "dtc2278"
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020/*
21 * Changing this #undef to #define may solve start up problems in some systems.
22 */
23#undef ALWAYS_SET_DTC2278_PIO_MODE
24
25/*
26 * From: andy@cercle.cts.com (Dyan Wile)
27 *
28 * Below is a patch for DTC-2278 - alike software-programmable controllers
29 * The code enables the secondary IDE controller and the PIO4 (3?) timings on
30 * the primary (EIDE). You may probably have to enable the 32-bit support to
31 * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
32 * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
33 * filesystem corrupted with -u1, but under heavy disk load only :-)
34 *
35 * This card is now forced to use the "serialize" feature,
36 * and irq-unmasking is disallowed. If io_32bit is enabled,
37 * it must be done for BOTH drives on each interface.
38 *
39 * This code was written for the DTC2278E, but might work with any of these:
40 *
41 * DTC2278S has only a single IDE interface.
42 * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
43 * DTC2278E also has serial ports and a printer port
44 * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
45 *
46 * There may be a fourth controller type. The S and D versions use the
47 * Winbond chip, and I think the E version does also.
48 *
49 */
50
51static void sub22 (char b, char c)
52{
53 int i;
54
55 for(i = 0; i < 3; ++i) {
56 inb(0x3f6);
57 outb_p(b,0xb0);
58 inb(0x3f6);
59 outb_p(c,0xb4);
60 inb(0x3f6);
61 if(inb(0xb4) == c) {
62 outb_p(7,0xb0);
63 inb(0x3f6);
64 return; /* success */
65 }
66 }
67}
68
Bartlomiej Zolnierkiewicza34a8752007-10-20 00:32:35 +020069static DEFINE_SPINLOCK(dtc2278_lock);
70
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +020071static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
73 unsigned long flags;
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 if (pio >= 3) {
Bartlomiej Zolnierkiewicza34a8752007-10-20 00:32:35 +020076 spin_lock_irqsave(&dtc2278_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 /*
78 * This enables PIO mode4 (3?) on the first interface
79 */
80 sub22(1,0xc3);
81 sub22(0,0xa0);
Bartlomiej Zolnierkiewicza34a8752007-10-20 00:32:35 +020082 spin_unlock_irqrestore(&dtc2278_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 } else {
84 /* we don't know how to set it back again.. */
Alan Coxd3bad452007-10-20 00:32:37 +020085 /* Actually we do - there is a data sheet available for the
86 Winbond but does anyone actually care */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +020090static const struct ide_port_ops dtc2278_port_ops = {
91 .set_pio_mode = dtc2278_set_pio_mode,
92};
93
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +010094static const struct ide_port_info dtc2278_port_info __initdata = {
Bartlomiej Zolnierkiewiczd92f1a22008-04-26 22:25:18 +020095 .name = DRV_NAME,
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +010096 .chipset = ide_dtc2278,
Bartlomiej Zolnierkiewiczac95bee2008-04-26 22:25:14 +020097 .port_ops = &dtc2278_port_ops,
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +010098 .host_flags = IDE_HFLAG_SERIALIZE |
Bartlomiej Zolnierkiewicz807b90d2008-02-02 19:56:40 +010099 IDE_HFLAG_NO_UNMASK_IRQS |
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100100 IDE_HFLAG_IO_32BIT |
Bartlomiej Zolnierkiewicz807b90d2008-02-02 19:56:40 +0100101 /* disallow ->io_32bit changes */
102 IDE_HFLAG_NO_IO_32BIT |
Bartlomiej Zolnierkiewicz2787cb82009-03-27 12:46:28 +0100103 IDE_HFLAG_NO_DMA |
104 IDE_HFLAG_DTC2278,
Bartlomiej Zolnierkiewiczc413b9b2008-02-02 19:56:31 +0100105 .pio_mask = ATA_PIO4,
106};
107
Bartlomiej Zolnierkiewicz84913882007-03-03 17:48:55 +0100108static int __init dtc2278_probe(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
110 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 local_irq_save(flags);
113 /*
114 * This enables the second interface
115 */
116 outb_p(4,0xb0);
117 inb(0x3f6);
118 outb_p(0x20,0xb4);
119 inb(0x3f6);
120#ifdef ALWAYS_SET_DTC2278_PIO_MODE
121 /*
122 * This enables PIO mode4 (3?) on the first interface
123 * and may solve start-up problems for some people.
124 */
125 sub22(1,0xc3);
126 sub22(0,0xa0);
127#endif
128 local_irq_restore(flags);
129
Bartlomiej Zolnierkiewicz0bfeee72008-04-26 22:25:16 +0200130 return ide_legacy_device_add(&dtc2278_port_info, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
Bartlomiej Zolnierkiewiczef87f8d2008-04-27 15:38:24 +0200133static int probe_dtc2278;
Bartlomiej Zolnierkiewicz84913882007-03-03 17:48:55 +0100134
135module_param_named(probe, probe_dtc2278, bool, 0);
136MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
137
Bartlomiej Zolnierkiewiczade2daf2008-01-26 20:13:07 +0100138static int __init dtc2278_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Bartlomiej Zolnierkiewicz84913882007-03-03 17:48:55 +0100140 if (probe_dtc2278 == 0)
141 return -ENODEV;
142
143 if (dtc2278_probe()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
145 return -EBUSY;
146 }
147 return 0;
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150module_init(dtc2278_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152MODULE_AUTHOR("See Local File");
153MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
154MODULE_LICENSE("GPL");