LXR uboot/arch/powerpc/cpu/mpc512x/diu.c

   1/*
   2 * Copyright 2008 Freescale Semiconductor, Inc.
   3 * York Sun <yorksun@freescale.com>
   4 *
   5 * FSL DIU Framebuffer driver
   6 *
   7 * See file CREDITS for list of people who contributed to this
   8 * project.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of
  13 * the License, or (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23 * MA 02111-1307 USA
  24 */
  25
  26#include <common.h>
  27#include <command.h>
  28#include <asm/io.h>
  29
  30#include <fsl_diu_fb.h>
  31
  32DECLARE_GLOBAL_DATA_PTR;
  33
  34void diu_set_pixel_clock(unsigned int pixclock)
  35{
  36        volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
  37        volatile clk512x_t *clk = &immap->clk;
  38        volatile unsigned int *clkdvdr = &clk->scfr[0];
  39        unsigned long speed_ccb, temp, pixval;
  40
  41        speed_ccb = get_bus_freq(0) * 4;
  42        temp = 1000000000/pixclock;
  43        temp *= 1000;
  44        pixval = speed_ccb / temp;
  45        debug("DIU pixval = %lu\n", pixval);
  46
  47        /* Modify PXCLK in GUTS CLKDVDR */
  48        debug("DIU: Current value of CLKDVDR = 0x%08x\n", in_be32(clkdvdr));
  49        temp = in_be32(clkdvdr) & 0xFFFFFF00;
  50        out_be32(clkdvdr, temp | (pixval & 0xFF));
  51        debug("DIU: Modified value of CLKDVDR = 0x%08x\n", in_be32(clkdvdr));
  52}
  53
  54int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
  55{
  56        unsigned int pixel_format = 0x88883316;
  57
  58        debug("mpc5121_diu_init\n");
  59        return fsl_diu_init(xres, yres, pixel_format, 0);
  60}
  61