1 /*
2 * linux/drivers/ide/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/types.h>
43 #include <linux/kernel.h>
44 #include <linux/delay.h>
45 #include <linux/timer.h>
46 #include <linux/mm.h>
47 #include <linux/ioport.h>
48 #include <linux/blkdev.h>
49 #include <linux/hdreg.h>
50 #include <linux/ide.h>
51 #include <linux/init.h>
52
53 #include <asm/io.h>
54
55 #include "ide_modes.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
65 static byte current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
66 static const byte 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 */
69 static const byte 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
74 static void out_umc (char port,char wert)
75 {
76 outb_p (port,0x108);
77 outb_p (wert,0x109);
78 }
79
80 static inline byte in_umc (char port)
81 {
82 outb_p (port,0x108);
83 return inb_p (0x109);
84 }
85
86 static void umc_set_speeds (byte 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 {
97 tmp = (tmp << 2) | speedtab[1][speeds[i]];
98 }
99 out_umc (0xdc,tmp);
100 for (i = 0;i < 4; i++)
101 {
102 out_umc (0xd0+i,speedtab[2][speeds[i]]);
103 out_umc (0xd8+i,speedtab[2][speeds[i]]);
104 }
105 outb_p (0xa5,0x108); /* disable umc */
106
107 printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
108 speeds[0], speeds[1], speeds[2], speeds[3]);
109 }
110
111 static void tune_umc (ide_drive_t *drive, byte pio)
112 {
113 unsigned long flags;
114 ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
115
116 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
117 printk("%s: setting umc8672 to PIO mode%d (speed %d)\n", drive->name, pio, pio_to_umc[pio]);
118 save_flags(flags); /* all CPUs */
119 cli(); /* all CPUs */
120 if (hwgroup && hwgroup->handler != NULL) {
121 printk("umc8672: other interface is busy: exiting tune_umc()\n");
122 } else {
123 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
124 umc_set_speeds (current_speeds);
125 }
126 restore_flags(flags); /* all CPUs */
127 }
128
129 void __init init_umc8672 (void) /* called from ide.c */
130 {
131 unsigned long flags;
132
133 __save_flags(flags); /* local CPU only */
134 __cli(); /* local CPU only */
135 if (check_region(0x108, 2)) {
136 __restore_flags(flags);
137 printk("\numc8672: PORTS 0x108-0x109 ALREADY IN USE\n");
138 return;
139 }
140 outb_p (0x5A,0x108); /* enable umc */
141 if (in_umc (0xd5) != 0xa0)
142 {
143 __restore_flags(flags); /* local CPU only */
144 printk ("umc8672: not found\n");
145 return;
146 }
147 outb_p (0xa5,0x108); /* disable umc */
148
149 umc_set_speeds (current_speeds);
150 __restore_flags(flags); /* local CPU only */
151
152 request_region(0x108, 2, "umc8672");
153 ide_hwifs[0].chipset = ide_umc8672;
154 ide_hwifs[1].chipset = ide_umc8672;
155 ide_hwifs[0].tuneproc = &tune_umc;
156 ide_hwifs[1].tuneproc = &tune_umc;
157 ide_hwifs[0].mate = &ide_hwifs[1];
158 ide_hwifs[1].mate = &ide_hwifs[0];
159 ide_hwifs[1].channel = 1;
160 }
161
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