1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4
5 #include "pci.h"
6 #include "vga.h"
7
8 /*
9 * ATT20C490 and ATT20C49[12] True-Color CMOS RAMDACs.
10 */
11 enum {
12 Cr0 = 0x00, /* Control register 0 */
13 };
14
15 static void
init(Vga * vga,Ctlr * ctlr)16 init(Vga* vga, Ctlr* ctlr)
17 {
18 ulong pclk;
19 char *p;
20
21 /*
22 * Part comes in -100, -80, -65 and -55MHz speed-grades.
23 * Work out the part speed-grade from name. Name can have,
24 * e.g. '-100' on the end for 100MHz part.
25 */
26 pclk = 55000000;
27 if(p = strrchr(ctlr->name, '-'))
28 pclk = strtoul(p+1, 0, 0) * 1000000;
29
30 /*
31 * If we don't already have a desired pclk,
32 * take it from the mode.
33 * Check it's within range.
34 */
35 if(vga->f == 0)
36 vga->f[0] = vga->mode->frequency;
37 if(vga->f[0] > pclk)
38 error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);
39 }
40
41 static void
load(Vga * vga,Ctlr * ctlr)42 load(Vga* vga, Ctlr* ctlr)
43 {
44 uchar mode, x;
45
46 /*
47 * Put the chip to sleep if possible.
48 */
49 if(ctlr->name[8] == '1'){
50 x = attdaci(Cr0);
51 attdaco(Cr0, x|0x04);
52 }
53
54 /*
55 * Set the mode in the RAMDAC, setting 6/8-bit colour
56 * as appropriate and waking the chip back up.
57 */
58 mode = 0x00;
59 if(vga->mode->z == 8 && ctlr->name[8] == '1' && 0)
60 mode |= 0x02;
61 attdaco(Cr0, mode);
62 }
63
64 static void
dump(Vga *,Ctlr * ctlr)65 dump(Vga*, Ctlr* ctlr)
66 {
67 printitem(ctlr->name, "Cr0");
68 printreg(attdaci(Cr0));
69 }
70
71 Ctlr att20c490 = {
72 "att20c490", /* name */
73 0, /* snarf */
74 0, /* options */
75 init, /* init */
76 load, /* load */
77 dump, /* dump */
78 };
79
80 Ctlr att20c491 = {
81 "att20c491", /* name */
82 0, /* snarf */
83 0, /* options */
84 init, /* init */
85 load, /* load */
86 dump, /* dump */
87 };
88
89 Ctlr att20c492 = {
90 "att20c492", /* name */
91 0, /* snarf */
92 0, /* options */
93 init, /* init */
94 load, /* load */
95 dump, /* dump */
96 };
97