litex/software/videomixer/fb.c

104 lines
2.3 KiB
C

#include <stdio.h>
#include <hw/csr.h>
#include <hw/flags.h>
#include "fb.h"
int fb_hres = 640;
int fb_vres = 480;
static void fb_clkgen_write(int cmd, int data)
{
int word;
word = (data << 2) | cmd;
crg_cmd_data_write(word);
crg_send_cmd_data_write(1);
while(crg_status_read() & CLKGEN_STATUS_BUSY);
}
void fb_set_mode(int mode)
{
int clock_m, clock_d;
switch(mode) {
default:
case FB_MODE_640_480: // Pixel clock: 25MHz
fb_hres = 640;
fb_vres = 480;
clock_m = 2;
clock_d = 4;
fb_fi_hres_write(640);
fb_fi_hsync_start_write(656);
fb_fi_hsync_end_write(752);
fb_fi_hscan_write(800);
fb_fi_vres_write(480);
fb_fi_vsync_start_write(492);
fb_fi_vsync_end_write(494);
fb_fi_vscan_write(525);
break;
case FB_MODE_800_600: // Pixel clock: 50MHz
fb_hres = 800;
fb_vres = 600;
clock_m = 2;
clock_d = 2;
fb_fi_hres_write(800);
fb_fi_hsync_start_write(848);
fb_fi_hsync_end_write(976);
fb_fi_hscan_write(1040);
fb_fi_vres_write(600);
fb_fi_vsync_start_write(636);
fb_fi_vsync_end_write(642);
fb_fi_vscan_write(665);
break;
case FB_MODE_1024_768: // Pixel clock: 65MHz
fb_hres = 1024;
fb_vres = 768;
clock_m = 13;
clock_d = 10;
fb_fi_hres_write(1024);
fb_fi_hsync_start_write(1048);
fb_fi_hsync_end_write(1184);
fb_fi_hscan_write(1344);
fb_fi_vres_write(768);
fb_fi_vsync_start_write(772);
fb_fi_vsync_end_write(778);
fb_fi_vscan_write(807);
break;
case FB_MODE_1920_1080: // Pixel clock: 148MHz
fb_hres = 1920;
fb_vres = 1080;
clock_m = 74;
clock_d = 25;
fb_fi_hres_write(1920);
fb_fi_hsync_start_write(2008);
fb_fi_hsync_end_write(2052);
fb_fi_hscan_write(2200);
fb_fi_vres_write(1080);
fb_fi_vsync_start_write(1084);
fb_fi_vsync_end_write(1089);
fb_fi_vscan_write(1125);
break;
}
fb_dma0_length_write(fb_hres*fb_vres*4);
fb_dma1_length_write(fb_hres*fb_vres*4);
fb_clkgen_write(0x1, clock_d-1);
fb_clkgen_write(0x3, clock_m-1);
crg_send_go_write(1);
printf("waiting for PROGDONE...");
while(!(crg_status_read() & CLKGEN_STATUS_PROGDONE));
printf("ok\n");
printf("waiting for LOCKED...");
while(!(crg_status_read() & CLKGEN_STATUS_LOCKED));
printf("ok\n");
printf("VGA: mode set to %dx%d\n", fb_hres, fb_vres);
}
void fb_enable(int en)
{
fb_enable_write(!!en);
}