board/freescale/mpc8610hpcd/mpc8610hpcd_diu.c

   1 /*
   2  * Copyright 2007-2011 Freescale Semiconductor, Inc.
   3  * Authors: York Sun <yorksun@freescale.com>
   4  *          Timur Tabi <timur@freescale.com>
   5  *
   6  * FSL DIU Framebuffer driver
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <asm/io.h>
  14 #include <fsl_diu_fb.h>
  15 #include "../common/pixis.h"
  16
  17 #define PX_BRDCFG0_DLINK        0x10
  18 #define PX_BRDCFG0_DVISEL       0x08
  19
  20 void diu_set_pixel_clock(unsigned int pixclock)
  21 {
  22         volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
  23         volatile ccsr_gur_t *gur = &immap->im_gur;
  24         volatile unsigned int *guts_clkdvdr = &gur->clkdvdr;
  25         unsigned long speed_ccb, temp, pixval;
  26
  27         speed_ccb = get_bus_freq(0);
  28         temp = 1000000000/pixclock;
  29         temp *= 1000;
  30         pixval = speed_ccb / temp;
  31         debug("DIU pixval = %lu\n", pixval);
  32
  33         /* Modify PXCLK in GUTS CLKDVDR */
  34         debug("DIU: Current value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
  35         temp = *guts_clkdvdr & 0x2000FFFF;
  36         *guts_clkdvdr = temp;                           /* turn off clock */
  37         *guts_clkdvdr = temp | 0x80000000 | ((pixval & 0x1F) << 16);
  38         debug("DIU: Modified value of CLKDVDR = 0x%08x\n", *guts_clkdvdr);
  39 }
  40
  41 int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
  42 {
  43         const char *name;
  44         int gamma_fix = 0;
  45         u32 pixel_format = 0x88883316;
  46         u8 temp;
  47
  48         temp = in_8(&pixis->brdcfg0);
  49
  50         if (strncmp(port, "dlvds", 5) == 0) {
  51                 /* Dual link LVDS */
  52                 gamma_fix = 1;
  53                 temp &= ~(PX_BRDCFG0_DLINK | PX_BRDCFG0_DVISEL);
  54                 name = "Dual-Link LVDS";
  55         } else if (strncmp(port, "lvds", 4) == 0) {
  56                 /* Single link LVDS */
  57                 temp = (temp & ~PX_BRDCFG0_DVISEL) | PX_BRDCFG0_DLINK;
  58                 name = "Single-Link LVDS";
  59         } else {
  60                 /* DVI */
  61                 if (in_8(&pixis->ver) == 1)     /* Board version */
  62                         pixel_format = 0x88882317;
  63                 temp |= PX_BRDCFG0_DVISEL;
  64                 name = "DVI";
  65         }
  66
  67         printf("DIU:   Switching to %s monitor @ %ux%u\n", name, xres, yres);
  68         out_8(&pixis->brdcfg0, temp);
  69
  70         return fsl_diu_init(xres, yres, pixel_format, gamma_fix);
  71 }