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/*
* Copyright 2007-2011 Freescale Semiconductor, Inc.
* Authors: York Sun <yorksun@freescale.com>
* Timur Tabi <timur@freescale.com>
*
* FSL DIU Framebuffer driver
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include <fsl_diu_fb.h>
#include "../common/pixis.h"
#define PX_BRDCFG0_DLINK 0x10
#define PX_BRDCFG0_DVISEL 0x08
void diu_set_pixel_clock(unsigned int pixclock)
{
volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
volatile ccsr_gur_t *gur = &immap->im_gur;
volatile unsigned int *guts_clkdvdr = &gur->clkdvdr;
unsigned long speed_ccb, temp, pixval;
speed_ccb = get_bus_freq(0);
temp = 1000000000/pixclock;
temp *= 1000;
pixval = speed_ccb / temp;
debug("DIU pixval = %lu\n", pixval);
/* Modify PXCLK in GUTS CLKDVDR */
debug("DIU: Current value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
temp = *guts_clkdvdr & 0x2000FFFF;
*guts_clkdvdr = temp; /* turn off clock */
*guts_clkdvdr = temp | 0x80000000 | ((pixval & 0x1F) << 16);
debug("DIU: Modified value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
}
int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
{
const char *name;
int gamma_fix = 0;
u32 pixel_format = 0x88883316;
u8 temp;
temp = in_8(&pixis->brdcfg0);
if (strncmp(port, "dlvds", 5) == 0) {
/* Dual link LVDS */
gamma_fix = 1;
temp &= ~(PX_BRDCFG0_DLINK | PX_BRDCFG0_DVISEL);
name = "Dual-Link LVDS";
} else if (strncmp(port, "lvds", 4) == 0) {
/* Single link LVDS */
temp = (temp & ~PX_BRDCFG0_DVISEL) | PX_BRDCFG0_DLINK;
name = "Single-Link LVDS";
} else {
/* DVI */
if (in_8(&pixis->ver) == 1) /* Board version */
pixel_format = 0x88882317;
temp |= PX_BRDCFG0_DVISEL;
name = "DVI";
}
printf("DIU: Switching to %s monitor @ %ux%u\n", name, xres, yres);
out_8(&pixis->brdcfg0, temp);
return fsl_diu_init(xres, pixel_format, gamma_fix);
}
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