1 /*
2 * Copyright (C) 1996 Linus Torvalds & author (see below)
3 */
4
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>
10 #include <linux/mm.h>
11 #include <linux/ioport.h>
12 #include <linux/blkdev.h>
13 #include <linux/ide.h>
14 #include <linux/init.h>
15
16 #include <asm/io.h>
17
18 #define DRV_NAME "dtc2278"
19
20 /*
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
sub22(char b,char c)51 static 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
69 static DEFINE_SPINLOCK(dtc2278_lock);
70
dtc2278_set_pio_mode(ide_hwif_t * hwif,ide_drive_t * drive)71 static void dtc2278_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
72 {
73 unsigned long flags;
74
75 if (drive->pio_mode >= XFER_PIO_3) {
76 spin_lock_irqsave(&dtc2278_lock, flags);
77 /*
78 * This enables PIO mode4 (3?) on the first interface
79 */
80 sub22(1,0xc3);
81 sub22(0,0xa0);
82 spin_unlock_irqrestore(&dtc2278_lock, flags);
83 } else {
84 /* we don't know how to set it back again.. */
85 /* Actually we do - there is a data sheet available for the
86 Winbond but does anyone actually care */
87 }
88 }
89
90 static const struct ide_port_ops dtc2278_port_ops = {
91 .set_pio_mode = dtc2278_set_pio_mode,
92 };
93
94 static const struct ide_port_info dtc2278_port_info __initconst = {
95 .name = DRV_NAME,
96 .chipset = ide_dtc2278,
97 .port_ops = &dtc2278_port_ops,
98 .host_flags = IDE_HFLAG_SERIALIZE |
99 IDE_HFLAG_NO_UNMASK_IRQS |
100 IDE_HFLAG_IO_32BIT |
101 /* disallow ->io_32bit changes */
102 IDE_HFLAG_NO_IO_32BIT |
103 IDE_HFLAG_NO_DMA |
104 IDE_HFLAG_DTC2278,
105 .pio_mask = ATA_PIO4,
106 };
107
dtc2278_probe(void)108 static int __init dtc2278_probe(void)
109 {
110 unsigned long flags;
111
112 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
130 return ide_legacy_device_add(&dtc2278_port_info, 0);
131 }
132
133 static bool probe_dtc2278;
134
135 module_param_named(probe, probe_dtc2278, bool, 0);
136 MODULE_PARM_DESC(probe, "probe for DTC2278xx chipsets");
137
dtc2278_init(void)138 static int __init dtc2278_init(void)
139 {
140 if (probe_dtc2278 == 0)
141 return -ENODEV;
142
143 if (dtc2278_probe()) {
144 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
145 return -EBUSY;
146 }
147 return 0;
148 }
149
150 module_init(dtc2278_init);
151
152 MODULE_AUTHOR("See Local File");
153 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
154 MODULE_LICENSE("GPL");
155