ref: 128ea44a89c7905612ad2fa5a61a9325ddfb5e1e
dir: /sys/src/cmd/aux/vga/sc15025.c/
#include <u.h> #include <libc.h> #include <bio.h> #include "pci.h" #include "vga.h" /* * Sierra SC1502[56] HiCOLOR-24 Palette. */ static void pixmask(void) { inportb(PaddrW); } static void commandrw(void) { int i; pixmask(); for(i = 0; i < 4; i++) inportb(Pixmask); } static uchar commandr(void) { uchar command; commandrw(); command = inportb(Pixmask); pixmask(); return command; } static void commandw(uchar command) { commandrw(); outportb(Pixmask, command); pixmask(); } static void options(Vga*, Ctlr* ctlr) { ctlr->flag |= Foptions; } static void init(Vga* vga, Ctlr* ctlr) { ulong pclk; char *p; /* * Part comes in -125, -110, -80, and -66MHz speed-grades. * Work out the part speed-grade from name. Name can have, * e.g. '-110' on the end for 100MHz part. */ pclk = 66000000; if(p = strrchr(ctlr->name, '-')) pclk = strtoul(p+1, 0, 0) * 1000000; /* * If we don't already have a desired pclk, * take it from the mode. * Check it's within range. */ if(vga->f[0] == 0) vga->f[0] = vga->mode->frequency; if(vga->f[0] > pclk) error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]); } static void load(Vga*, Ctlr*) { uchar aux, command; aux = 0x00; /* if(vga->mode->z == 8) aux = 0x01; */ commandrw(); command = inportb(Pixmask); outportb(Pixmask, command|0x18); outportb(PaddrR, 0x08); outportb(PaddrW, aux); commandw(command); } static void dump(Vga*, Ctlr* ctlr) { int i; uchar command; printitem(ctlr->name, "command"); command = commandr(); printreg(command); printitem(ctlr->name, "index08"); commandw(command|0x10); for(i = 0x08; i < 0x11; i++){ outportb(PaddrR, i); printreg(inportb(PaddrW)); } commandw(command); } Ctlr sc15025 = { "sc15025", /* name */ 0, /* snarf */ options, /* options */ init, /* init */ load, /* load */ dump, /* dump */ };