84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright 2010-2011 Freescale Semiconductor, Inc.
|
|
* Authors: Timur Tabi <timur@freescale.com>
|
|
*
|
|
* FSL DIU Framebuffer driver
|
|
*/
|
|
|
|
#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);
|
|
}
|