1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4
5 #include "pci.h"
6 #include "vga.h"
7
8 /*
9 * S3 86C928 GUI Accelerator.
10 */
11 static void
snarf(Vga * vga,Ctlr * ctlr)12 snarf(Vga* vga, Ctlr* ctlr)
13 {
14 s3generic.snarf(vga, ctlr);
15 }
16
17 static void
options(Vga *,Ctlr * ctlr)18 options(Vga*, Ctlr* ctlr)
19 {
20 ctlr->flag |= Hlinear|Henhanced|Foptions;
21 }
22
23 static void
init(Vga * vga,Ctlr * ctlr)24 init(Vga* vga, Ctlr* ctlr)
25 {
26 Mode *mode;
27 ulong x;
28
29 /*
30 * s3generic.init() will perform the same test.
31 * We need to do it here too so that the Crt registers
32 * will be correct when s3generic.init() calculates
33 * the overflow bits.
34 */
35 if(vga->mode->z > 8)
36 error("depth %d not supported\n", vga->mode->z);
37
38 mode = vga->mode;
39 if((ctlr->flag & Henhanced) && mode->x >= 1024 && mode->z == 8){
40 resyncinit(vga, ctlr, Uenhanced, 0);
41 vga->crt[0x00] = ((mode->ht/4)>>3)-5;
42 vga->crt[0x01] = ((mode->x/4)>>3)-1;
43 vga->crt[0x02] = ((mode->shb/4)>>3)-1;
44
45 x = (mode->ehb/4)>>3;
46 vga->crt[0x03] = 0x80|(x & 0x1F);
47 vga->crt[0x04] = (mode->shs/4)>>3;
48 vga->crt[0x05] = ((mode->ehs/4)>>3) & 0x1F;
49 if(x & 0x20)
50 vga->crt[0x05] |= 0x80;
51
52 vga->crt[0x13] = mode->x/8;
53 if(mode->z == 1)
54 vga->crt[0x13] /= 8;
55 }
56 s3generic.init(vga, ctlr);
57 vga->crt[0x3B] = (vga->crt[0]+vga->crt[4]+1)/2;
58
59 /*
60 * Set up write-posting and read-ahead-cache.
61 */
62 vga->crt[0x54] = 0xA7;
63 if(ctlr->flag & Uenhanced){
64 vga->crt[0x58] |= 0x04;
65 vga->crt[0x40] |= 0x08;
66 }
67 else{
68 vga->crt[0x58] &= ~0x04;
69 vga->crt[0x40] &= ~0x08;
70 }
71
72 /*
73 * Set up parallel VRAM and the external
74 * SID enable on the 86C928
75 */
76 vga->crt[0x53] &= ~0x20; /* parallel VRAM */
77 vga->crt[0x55] &= ~0x48; /* external SID */
78 vga->crt[0x65] &= ~0x60; /* 2 86C928 E-step chip bugs */
79 if(ctlr->flag & Uenhanced){
80 if(vga->ramdac->flag & Hpvram)
81 vga->crt[0x53] |= 0x20;
82 if(vga->ramdac->flag & Hextsid)
83 vga->crt[0x55] |= 0x48;
84 vga->crt[0x65] |= 0x60;
85 }
86 }
87
88 static void
load(Vga * vga,Ctlr * ctlr)89 load(Vga* vga, Ctlr* ctlr)
90 {
91 ushort advfunc;
92
93 (*s3generic.load)(vga, ctlr);
94 vgaxo(Crtx, 0x65, vga->crt[0x65]);
95
96 advfunc = 0x0000;
97 if(ctlr->flag & Uenhanced){
98 if(vga->mode->x == 1024 || vga->mode->x == 800)
99 advfunc = 0x0057;
100 else
101 advfunc = 0x0053;
102 }
103 outportw(0x4AE8, advfunc);
104 }
105
106 static void
dump(Vga * vga,Ctlr * ctlr)107 dump(Vga* vga, Ctlr* ctlr)
108 {
109 (*s3generic.dump)(vga, ctlr);
110 }
111
112 Ctlr s3928 = {
113 "s3928", /* name */
114 snarf, /* snarf */
115 options, /* options */
116 init, /* init */
117 load, /* load */
118 dump, /* dump */
119 };
120