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/*
* Copyright 2010-2011 Freescale Semiconductor, Inc.
* Authors: Timur Tabi <timur@freescale.com>
*
* FSL DIU Framebuffer driver
*
* 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.
*/
#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <asm/io.h>
#include <stdio_dev.h>
#include <video_fb.h>
#include <fsl_diu_fb.h>
#define PMUXCR_ELBCDIU_MASK 0xc0000000
#define PMUXCR_ELBCDIU_NOR16 0x80000000
#define PMUXCR_ELBCDIU_DIU 0x40000000
/*
* DIU Area Descriptor
*
* Note that we need to byte-swap the value before it's written to the AD
* register. So even though the registers don't look like they're in the same
* bit positions as they are on the MPC8610, the same value is written to the
* AD register on the MPC8610 and on the P1022.
*/
#define AD_BYTE_F 0x10000000
#define AD_ALPHA_C_SHIFT 25
#define AD_BLUE_C_SHIFT 23
#define AD_GREEN_C_SHIFT 21
#define AD_RED_C_SHIFT 19
#define AD_PIXEL_S_SHIFT 16
#define AD_COMP_3_SHIFT 12
#define AD_COMP_2_SHIFT 8
#define AD_COMP_1_SHIFT 4
#define AD_COMP_0_SHIFT 0
/*
* Variables used by the DIU/LBC switching code. It's safe to makes these
* global, because the DIU requires DDR, so we'll only run this code after
* relocation.
*/
static u32 pmuxcr;
void diu_set_pixel_clock(unsigned int pixclock)
{
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
unsigned long speed_ccb, temp;
u32 pixval;
speed_ccb = get_bus_freq(0);
temp = 1000000000 / pixclock;
temp *= 1000;
pixval = speed_ccb / temp;
debug("DIU pixval = %u\n", pixval);
/* Modify PXCLK in GUTS CLKDVDR */
temp = in_be32(&gur->clkdvdr) & 0x2000FFFF;
out_be32(&gur->clkdvdr, temp); /* turn off clock */
out_be32(&gur->clkdvdr, temp | 0x80000000 | ((pixval & 0x1F) << 16));
}
int platform_diu_init(unsigned int xres, unsigned int yres, const char *port)
{
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
u32 pixel_format;
pixel_format = cpu_to_le32(AD_BYTE_F | (3 << AD_ALPHA_C_SHIFT) |
(0 << AD_BLUE_C_SHIFT) | (1 << AD_GREEN_C_SHIFT) |
(2 << AD_RED_C_SHIFT) | (8 << AD_COMP_3_SHIFT) |
(8 << AD_COMP_2_SHIFT) | (8 << AD_COMP_1_SHIFT) |
(8 << AD_COMP_0_SHIFT) | (3 << AD_PIXEL_S_SHIFT));
printf("DIU: Switching to %ux%u\n", xres, yres);
/* Set PMUXCR to switch the muxed pins from the LBC to the DIU */
clrsetbits_be32(&gur->pmuxcr, PMUXCR_ELBCDIU_MASK, PMUXCR_ELBCDIU_DIU);
pmuxcr = in_be32(&gur->pmuxcr);
return fsl_diu_init(xres, yres, pixel_format, 0);
}
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