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/*
* (C) Copyright 2011
* Matthias Weisser <weisserm@arcor.de>
*
* SPDX-License-Identifier: GPL-2.0+
*
* imx25lcdc.c - Graphic interface for i.MX25 lcd controller
*/
#include <common.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <video_fb.h>
#include "videomodes.h"
/*
* 4MB (at the end of system RAM)
*/
#define VIDEO_MEM_SIZE 0x400000
#define FB_SYNC_CLK_INV (1<<16) /* pixel clock inverted */
/*
* Graphic Device
*/
static GraphicDevice imx25fb;
void *video_hw_init(void)
{
struct lcdc_regs *lcdc = (struct lcdc_regs *)IMX_LCDC_BASE;
struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
GraphicDevice *pGD = &imx25fb;
char *s;
u32 *videomem;
memset(pGD, 0, sizeof(GraphicDevice));
pGD->gdfIndex = GDF_16BIT_565RGB;
pGD->gdfBytesPP = 2;
pGD->memSize = VIDEO_MEM_SIZE;
pGD->frameAdrs = PHYS_SDRAM + PHYS_SDRAM_SIZE - VIDEO_MEM_SIZE;
videomem = (u32 *)pGD->frameAdrs;
s = getenv("videomode");
if (s != NULL) {
struct ctfb_res_modes var_mode;
u32 lsr, lpcr, lhcr, lvcr;
unsigned long div;
int bpp;
/* Disable all clocks of the LCDC */
writel(readl(&ccm->cgr0) & ~((1<<7) | (1<<24)), &ccm->cgr0);
writel(readl(&ccm->cgr1) & ~(1<<29), &ccm->cgr1);
bpp = video_get_params(&var_mode, s);
if (bpp == 0) {
var_mode.xres = 320;
var_mode.yres = 240;
var_mode.pixclock = 154000;
var_mode.left_margin = 68;
var_mode.right_margin = 20;
var_mode.upper_margin = 4;
var_mode.lower_margin = 18;
var_mode.hsync_len = 40;
var_mode.vsync_len = 6;
var_mode.sync = 0;
var_mode.vmode = 0;
}
/* Fill memory with white */
memset(videomem, 0xFF, var_mode.xres * var_mode.yres * 2);
imx25fb.winSizeX = var_mode.xres;
imx25fb.winSizeY = var_mode.yres;
/* LCD base clock is 66.6MHZ. We do calculations in kHz */
div = 66000 / (1000000000L / var_mode.pixclock);
if (div > 63)
div = 63;
if (0 == div)
div = 1;
lsr = ((var_mode.xres / 16) << 20) |
var_mode.yres;
lpcr = (1 << 31) |
(1 << 30) |
(5 << 25) |
(1 << 23) |
(1 << 22) |
(1 << 19) |
(1 << 7) |
div;
lhcr = (var_mode.right_margin << 0) |
(var_mode.left_margin << 8) |
(var_mode.hsync_len << 26);
lvcr = (var_mode.lower_margin << 0) |
(var_mode.upper_margin << 8) |
(var_mode.vsync_len << 26);
writel((uint32_t)videomem, &lcdc->lssar);
writel(lsr, &lcdc->lsr);
writel(var_mode.xres * 2 / 4, &lcdc->lvpwr);
writel(lpcr, &lcdc->lpcr);
writel(lhcr, &lcdc->lhcr);
writel(lvcr, &lcdc->lvcr);
writel(0x00040060, &lcdc->ldcr);
writel(0xA90300, &lcdc->lpccr);
/* Ensable all clocks of the LCDC */
writel(readl(&ccm->cgr0) | ((1<<7) | (1<<24)), &ccm->cgr0);
writel(readl(&ccm->cgr1) | (1<<29), &ccm->cgr1);
}
return pGD;
}
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