ref: 88ccea37f65b87312292b2b1a107c39927c6a2c3
dir: /sys/src/cmd/aux/vga/att20c49x.c/
#include <u.h> #include <libc.h> #include <bio.h> #include "pci.h" #include "vga.h" /* * ATT20C490 and ATT20C49[12] True-Color CMOS RAMDACs. */ enum { Cr0 = 0x00, /* Control register 0 */ }; static void init(Vga* vga, Ctlr* ctlr) { ulong pclk; char *p; /* * Part comes in -100, -80, -65 and -55MHz speed-grades. * Work out the part speed-grade from name. Name can have, * e.g. '-100' on the end for 100MHz part. */ pclk = 55000000; 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) 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* vga, Ctlr* ctlr) { uchar mode, x; /* * Put the chip to sleep if possible. */ if(ctlr->name[8] == '1'){ x = attdaci(Cr0); attdaco(Cr0, x|0x04); } /* * Set the mode in the RAMDAC, setting 6/8-bit colour * as appropriate and waking the chip back up. */ mode = 0x00; if(vga->mode->z == 8 && ctlr->name[8] == '1' && 0) mode |= 0x02; attdaco(Cr0, mode); } static void dump(Vga*, Ctlr* ctlr) { printitem(ctlr->name, "Cr0"); printreg(attdaci(Cr0)); } Ctlr att20c490 = { "att20c490", /* name */ 0, /* snarf */ 0, /* options */ init, /* init */ load, /* load */ dump, /* dump */ }; Ctlr att20c491 = { "att20c491", /* name */ 0, /* snarf */ 0, /* options */ init, /* init */ load, /* load */ dump, /* dump */ }; Ctlr att20c492 = { "att20c492", /* name */ 0, /* snarf */ 0, /* options */ init, /* init */ load, /* load */ dump, /* dump */ };