1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/* $XConsortium: ICD2061Aalt.c,v 1.1 94/03/28 21:24:51 dpw Exp $ */
/* $XFree86: xc/programs/Xserver/hw/xfree86/common_hw/I2061Aalt.c,v 3.3 1995/01/20 04:21:16 dawes Exp $ */
/*
* This code is derived from code available from the STB bulletin board
*/
#include "compiler.h"
#define SEQREG 0x03C4
#define MISCREG 0x03C2
#define MISCREAD 0x03CC
double fref = 14.31818 * 2.0;
char ascclk[] = "VIDEO CLOCK ?";
unsigned short clknum;
unsigned short vlbus_flag;
unsigned short card;
unsigned short crtcaddr;
unsigned short clockreg;
static double range[15] = {50.0, 51.0, 53.2, 58.5, 60.7, 64.4, 66.8, 73.5,
75.6, 80.9, 83.2, 91.5, 100.0, 120.0, 120.0000001};
#ifdef __STDC__
#if 0
static void prtbinary(unsigned int size, unsigned int val);
#endif
static void wait_vb();
static void wrt_clk_bit(unsigned int value);
static void init_clock(unsigned long setup, unsigned short crtcport);
#else
#if 0
static void prtbinary();
#endif
static void wait_vb();
static void wrt_clk_bit();
static void init_clock();
#endif
void AltICD2061SetClock(frequency, select)
register long frequency; /* in Hz */
int select;
{
unsigned int m;
int i;
long dwv;
double realval;
double freq, fvco;
double dev, devx;
double delta, deltax;
double f0;
unsigned int p, q;
unsigned int bestp=0, bestq=0, bestm=0, besti=0;
unsigned char tmp;
crtcaddr=(inb(0x3CC) & 0x01) ? 0x3D4 : 0x3B4;
outb(crtcaddr, 0x11); /* Unlock CRTC registers */
tmp = inb(crtcaddr + 1);
outb(crtcaddr + 1, tmp & ~0x80);
outw(crtcaddr, 0x4838); /* Unlock S3 register set */
outw(crtcaddr, 0xA039);
clknum = select;
freq = ((double)frequency)/1000000.0;
if (freq > range[13])
freq = range[13];
else if (freq < 7.0)
freq = 7.0;
/*
* Calculate values to load into ICD 2061A clock chip to set frequency
*/
delta = 999.0;
dev = 999.0;
for (m = 0; m < 8; m++) {
fvco = freq * (1<<m);
if (fvco < 50.0 || fvco > 120.0) continue;
f0 = fvco / fref;
for (q = 14; q <= 71; q++) { /* q={15..71}:Constraint 2 on page 14 */
p = (int)(f0 * q + 0.5);
if (p < 4 || p > 130) /* p={4..130}:Constraint 5 on page 14 */
continue;
deltax = (double)(p) / (double)(q) - f0;
if (deltax < 0) deltax = -deltax;
if (deltax <= delta) {
for (i = 13; i >= 0; i--)
if (fvco >= range[i])
break;
devx = (fvco - (range[i] + range[i+1])/2)/fvco;
if (devx < 0)
devx = -devx;
if (deltax < delta || devx < dev) {
delta = deltax;
dev = devx;
bestp = p;
bestq = q;
bestm = m;
besti = i;
}
}
}
}
fvco = fref / (1<<bestm);
realval = (fvco * bestp) / bestq;
dwv = ((((((long)besti << 7) | (bestp-3)) << 3) | bestm) << 7) | (bestq-2);
/*
* Write ICD 2061A clock chip
*/
init_clock(((unsigned long)dwv) | (((long)clknum) << 21), crtcaddr);
wait_vb();
wait_vb();
wait_vb();
wait_vb();
wait_vb();
wait_vb();
wait_vb(); /* 0.10 second delay... */
}
#if 0
static void prtbinary(size, val)
unsigned int size;
unsigned int val;
{
unsigned int mask;
int k;
mask = 1;
for (k=size; --k > 0 || mask <= val/2;)
mask <<= 1;
while (mask) {
fputc((mask&val)? '1': '0' , stderr);
mask >>= 1;
}
}
#endif
static void wait_vb()
{
while ((inb(crtcaddr+6) & 0x08) == 0)
;
while (inb(crtcaddr+6) & 0x08)
;
}
#ifdef __STDC__
static void init_clock(unsigned long setup, unsigned short crtcport)
#else
static void init_clock(setup, crtcport)
unsigned long setup;
unsigned short crtcport;
#endif
{
unsigned char nclk[2], clk[2];
unsigned short restore42;
unsigned short oldclk;
unsigned short bitval;
int i;
unsigned char c;
(void)xf86DisableInterrupts();
oldclk = inb(0x3CC);
outb(crtcport, 0x42);
restore42 = inb(crtcport+1);
outw(0x3C4, 0x0100);
outb(0x3C4, 1);
c = inb(0x3C5);
outb(0x3C5, 0x20 | c);
outb(crtcport, 0x42);
outb(crtcport+1, 0x03);
outw(0x3C4, 0x0300);
nclk[0] = oldclk & 0xF3;
nclk[1] = nclk[0] | 0x08;
clk[0] = nclk[0] | 0x04;
clk[1] = nclk[0] | 0x0C;
outb(crtcport, 0x42);
i = inw(crtcport);
outw(0x3C4, 0x0100);
wrt_clk_bit(oldclk | 0x08);
wrt_clk_bit(oldclk | 0x0C);
for (i=0; i<5; i++) {
wrt_clk_bit(nclk[1]);
wrt_clk_bit(clk[1]);
}
wrt_clk_bit(nclk[1]);
wrt_clk_bit(nclk[0]);
wrt_clk_bit(clk[0]);
wrt_clk_bit(nclk[0]);
wrt_clk_bit(clk[0]);
for (i=0; i<24; i++) {
bitval = setup & 0x01;
setup >>= 1;
wrt_clk_bit(clk[1-bitval]);
wrt_clk_bit(nclk[1-bitval]);
wrt_clk_bit(nclk[bitval]);
wrt_clk_bit(clk[bitval]);
}
wrt_clk_bit(clk[1]);
wrt_clk_bit(nclk[1]);
wrt_clk_bit(clk[1]);
outb(0x3C4, 1);
c = inb(0x3C5);
outb(0x3C5, 0xDF & c);
outb(crtcport, 0x42);
outb(crtcport+1, restore42);
outb(0x3C2, oldclk);
outw(0x3C4, 0x0300);
xf86EnableInterrupts();
}
static void wrt_clk_bit(value)
unsigned int value;
{
int j;
outb(0x3C2, value);
for (j=2; --j; )
inb(0x200);
}
|
