atmel_lcdfb.c
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/*
* Driver for AT91/AT32 LCD Controller
*
* Copyright (C) 2007 Atmel Corporation
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/gpio.h>
#include <asm/arch/clk.h>
#include <lcd.h>
#include <atmel_lcdc.h>
/* configurable parameters */
#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
#define ATMEL_LCDC_DMA_BURST_LEN 8
#ifndef ATMEL_LCDC_GUARD_TIME
#define ATMEL_LCDC_GUARD_TIME 1
#endif
#if defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91CAP9)
#define ATMEL_LCDC_FIFO_SIZE 2048
#else
#define ATMEL_LCDC_FIFO_SIZE 512
#endif
#define lcdc_readl(mmio, reg) __raw_readl((mmio)+(reg))
#define lcdc_writel(mmio, reg, val) __raw_writel((val), (mmio)+(reg))
void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
{
#if defined(CONFIG_ATMEL_LCD_BGR555)
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
(red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
#else
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
(blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
#endif
}
void lcd_ctrl_init(void *lcdbase)
{
unsigned long value;
/* Turn off the LCD controller and the DMA controller */
lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
/* Wait for the LCDC core to become idle */
while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
udelay(10);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
/* Reset LCDC DMA */
lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
/* ...set frame size and burst length = 8 words (?) */
value = (panel_info.vl_col * panel_info.vl_row *
NBITS(panel_info.vl_bpix)) / 32;
value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
/* Set pixel clock */
value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
value++;
value = (value / 2) - 1;
if (!value) {
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
} else
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
value << ATMEL_LCDC_CLKVAL_OFFSET);
/* Initialize control register 2 */
#ifdef CONFIG_AVR32
value = ATMEL_LCDC_MEMOR_BIG | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
#else
value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
#endif
if (panel_info.vl_tft)
value |= ATMEL_LCDC_DISTYPE_TFT;
value |= panel_info.vl_sync;
value |= (panel_info.vl_bpix << 5);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
/* Vertical timing */
value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
value |= panel_info.vl_lower_margin;
lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
/* Horizontal timing */
value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
value |= (panel_info.vl_left_margin - 1);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
/* Display size */
value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
value |= panel_info.vl_row - 1;
lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
/* FIFO Threshold: Use formula from data sheet */
value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
/* Toggle LCD_MODE every frame */
lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
/* Disable all interrupts */
lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
/* Set contrast */
value = ATMEL_LCDC_PS_DIV8 |
ATMEL_LCDC_ENA_PWMENABLE;
if (!panel_info.vl_cont_pol_low)
value |= ATMEL_LCDC_POL_POSITIVE;
lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
/* Set framebuffer DMA base address and pixel offset */
lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
(ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
}
ulong calc_fbsize(void)
{
return ((panel_info.vl_col * panel_info.vl_row *
NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
}