tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/drivers/ide/legacy/umc8672.c Version 0.05 Jul 31, 1996
3 *
4 * Copyright (C) 1995-1996 Linus Torvalds & author (see below)
5 */
6
7/*
8 * Principal Author/Maintainer: PODIEN@hml2.atlas.de (Wolfram Podien)
9 *
10 * This file provides support for the advanced features
11 * of the UMC 8672 IDE interface.
12 *
13 * Version 0.01 Initial version, hacked out of ide.c,
14 * and #include'd rather than compiled separately.
15 * This will get cleaned up in a subsequent release.
16 *
17 * Version 0.02 now configs/compiles separate from ide.c -ml
18 * Version 0.03 enhanced auto-tune, fix display bug
19 * Version 0.05 replace sti() with restore_flags() -ml
20 * add detection of possible race condition -ml
21 */
22
23/*
24 * VLB Controller Support from
25 * Wolfram Podien
26 * Rohoefe 3
27 * D28832 Achim
28 * Germany
29 *
30 * To enable UMC8672 support there must a lilo line like
31 * append="ide0=umc8672"...
32 * To set the speed according to the abilities of the hardware there must be a
33 * line like
34 * #define UMC_DRIVE0 11
35 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
36 * are some lines present). 0 - 11 are allowed speed values. These values are
37 * the results from the DOS speed test program supplied from UMC. 11 is the
38 * highest speed (about PIO mode 3)
39 */
40#define REALLY_SLOW_IO /* some systems can safely undef this */
41
42#include <linux/module.h>
43#include <linux/config.h>
44#include <linux/types.h>
45#include <linux/kernel.h>
46#include <linux/delay.h>
47#include <linux/timer.h>
48#include <linux/mm.h>
49#include <linux/ioport.h>
50#include <linux/blkdev.h>
51#include <linux/hdreg.h>
52#include <linux/ide.h>
53#include <linux/init.h>
54
55#include <asm/io.h>
56
57/*
58 * Default speeds. These can be changed with "auto-tune" and/or hdparm.
59 */
60#define UMC_DRIVE0 1 /* DOS measured drive speeds */
61#define UMC_DRIVE1 1 /* 0 to 11 allowed */
62#define UMC_DRIVE2 1 /* 11 = Fastest Speed */
63#define UMC_DRIVE3 1 /* In case of crash reduce speed */
64
65static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
66static const u8 pio_to_umc [5] = {0,3,7,10,11}; /* rough guesses */
67
68/* 0 1 2 3 4 5 6 7 8 9 10 11 */
69static const u8 speedtab [3][12] = {
70 {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
71 {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
72 {0xff,0xcb,0xc0,0x58,0x36,0x33,0x23,0x22,0x21,0x11,0x10,0x0}};
73
74static void out_umc (char port,char wert)
75{
76 outb_p(port,0x108);
77 outb_p(wert,0x109);
78}
79
80static inline u8 in_umc (char port)
81{
82 outb_p(port,0x108);
83 return inb_p(0x109);
84}
85
86static void umc_set_speeds (u8 speeds[])
87{
88 int i, tmp;
89
90 outb_p(0x5A,0x108); /* enable umc */
91
92 out_umc (0xd7,(speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
93 out_umc (0xd6,(speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
94 tmp = 0;
95 for (i = 3; i >= 0; i--) {
96 tmp = (tmp << 2) | speedtab[1][speeds[i]];
97 }
98 out_umc (0xdc,tmp);
99 for (i = 0;i < 4; i++) {
100 out_umc (0xd0+i,speedtab[2][speeds[i]]);
101 out_umc (0xd8+i,speedtab[2][speeds[i]]);
102 }
103 outb_p(0xa5,0x108); /* disable umc */
104
105 printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
106 speeds[0], speeds[1], speeds[2], speeds[3]);
107}
108
109static void tune_umc (ide_drive_t *drive, u8 pio)
110{
111 unsigned long flags;
112 ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
113
114 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
115 printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
116 drive->name, pio, pio_to_umc[pio]);
117 spin_lock_irqsave(&ide_lock, flags);
118 if (hwgroup && hwgroup->handler != NULL) {
119 printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
120 } else {
121 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
122 umc_set_speeds (current_speeds);
123 }
124 spin_unlock_irqrestore(&ide_lock, flags);
125}
126
127static int __init umc8672_probe(void)
128{
129 unsigned long flags;
130 ide_hwif_t *hwif, *mate;
131
132 if (!request_region(0x108, 2, "umc8672")) {
133 printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
134 return 1;
135 }
136 local_irq_save(flags);
137 outb_p(0x5A,0x108); /* enable umc */
138 if (in_umc (0xd5) != 0xa0) {
139 local_irq_restore(flags);
140 printk(KERN_ERR "umc8672: not found\n");
141 release_region(0x108, 2);
142 return 1;
143 }
144 outb_p(0xa5,0x108); /* disable umc */
145
146 umc_set_speeds (current_speeds);
147 local_irq_restore(flags);
148
149 hwif = &ide_hwifs[0];
150 mate = &ide_hwifs[1];
151
152 hwif->chipset = ide_umc8672;
153 hwif->tuneproc = &tune_umc;
154 hwif->mate = mate;
155
156 mate->chipset = ide_umc8672;
157 mate->tuneproc = &tune_umc;
158 mate->mate = hwif;
159 mate->channel = 1;
160
161 probe_hwif_init(hwif);
162 probe_hwif_init(mate);
163
164 create_proc_ide_interfaces();
165
166 return 0;
167}
168
169/* Can be called directly from ide.c. */
170int __init umc8672_init(void)
171{
172 if (umc8672_probe())
173 return -ENODEV;
174 return 0;
175}
176
177#ifdef MODULE
178module_init(umc8672_init);
179#endif
180
181MODULE_AUTHOR("Wolfram Podien");
182MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
183MODULE_LICENSE("GPL");