text: /*
   * 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, yres, pixel_format, gamma_fix);
  }
  