atmel_hlcdfb.c
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/*
* Driver for AT91/AT32 MULTI LAYER LCD Controller
*
* Copyright (C) 2012 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_hlcdc.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
#define ATMEL_LCDC_FIFO_SIZE 512
#define lcdc_readl(reg) __raw_readl((reg))
#define lcdc_writel(reg, val) __raw_writel((val), (reg))
/*
* the CLUT register map as following
* RCLUT(24 ~ 16), GCLUT(15 ~ 8), BCLUT(7 ~ 0)
*/
void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
{
lcdc_writel(((red << LCDC_BASECLUT_RCLUT_Pos) & LCDC_BASECLUT_RCLUT_Msk)
| ((green << LCDC_BASECLUT_GCLUT_Pos) & LCDC_BASECLUT_GCLUT_Msk)
| ((blue << LCDC_BASECLUT_BCLUT_Pos) & LCDC_BASECLUT_BCLUT_Msk),
panel_info.mmio + ATMEL_LCDC_LUT(regno));
}
void lcd_ctrl_init(void *lcdbase)
{
unsigned long value;
struct lcd_dma_desc *desc;
struct atmel_hlcd_regs *regs;
if (!has_lcdc())
return; /* No lcdc */
regs = (struct atmel_hlcd_regs *)panel_info.mmio;
/* Disable DISP signal */
lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_DISPDIS);
while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
udelay(1);
/* Disable synchronization */
lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_SYNCDIS);
while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
udelay(1);
/* Disable pixel clock */
lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_CLKDIS);
while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
udelay(1);
/* Disable PWM */
lcdc_writel(®s->lcdc_lcddis, LCDC_LCDDIS_PWMDIS);
while ((lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
udelay(1);
/* Set pixel clock */
value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
value++;
if (value < 1) {
/* Using system clock as pixel clock */
lcdc_writel(®s->lcdc_lcdcfg0,
LCDC_LCDCFG0_CLKDIV(0)
| LCDC_LCDCFG0_CGDISHCR
| LCDC_LCDCFG0_CGDISHEO
| LCDC_LCDCFG0_CGDISOVR1
| LCDC_LCDCFG0_CGDISBASE
| panel_info.vl_clk_pol
| LCDC_LCDCFG0_CLKSEL);
} else {
lcdc_writel(®s->lcdc_lcdcfg0,
LCDC_LCDCFG0_CLKDIV(value - 2)
| LCDC_LCDCFG0_CGDISHCR
| LCDC_LCDCFG0_CGDISHEO
| LCDC_LCDCFG0_CGDISOVR1
| LCDC_LCDCFG0_CGDISBASE
| panel_info.vl_clk_pol);
}
/* Initialize control register 5 */
value = 0;
value |= panel_info.vl_sync;
#ifndef LCD_OUTPUT_BPP
/* Output is 24bpp */
value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
#else
switch (LCD_OUTPUT_BPP) {
case 12:
value |= LCDC_LCDCFG5_MODE_OUTPUT_12BPP;
break;
case 16:
value |= LCDC_LCDCFG5_MODE_OUTPUT_16BPP;
break;
case 18:
value |= LCDC_LCDCFG5_MODE_OUTPUT_18BPP;
break;
case 24:
value |= LCDC_LCDCFG5_MODE_OUTPUT_24BPP;
break;
default:
BUG();
break;
}
#endif
value |= LCDC_LCDCFG5_GUARDTIME(ATMEL_LCDC_GUARD_TIME);
value |= (LCDC_LCDCFG5_DISPDLY | LCDC_LCDCFG5_VSPDLYS);
lcdc_writel(®s->lcdc_lcdcfg5, value);
/* Vertical & Horizontal Timing */
value = LCDC_LCDCFG1_VSPW(panel_info.vl_vsync_len - 1);
value |= LCDC_LCDCFG1_HSPW(panel_info.vl_hsync_len - 1);
lcdc_writel(®s->lcdc_lcdcfg1, value);
value = LCDC_LCDCFG2_VBPW(panel_info.vl_lower_margin);
value |= LCDC_LCDCFG2_VFPW(panel_info.vl_upper_margin - 1);
lcdc_writel(®s->lcdc_lcdcfg2, value);
value = LCDC_LCDCFG3_HBPW(panel_info.vl_right_margin - 1);
value |= LCDC_LCDCFG3_HFPW(panel_info.vl_left_margin - 1);
lcdc_writel(®s->lcdc_lcdcfg3, value);
/* Display size */
value = LCDC_LCDCFG4_RPF(panel_info.vl_row - 1);
value |= LCDC_LCDCFG4_PPL(panel_info.vl_col - 1);
lcdc_writel(®s->lcdc_lcdcfg4, value);
lcdc_writel(®s->lcdc_basecfg0,
LCDC_BASECFG0_BLEN_AHB_INCR4 | LCDC_BASECFG0_DLBO);
switch (NBITS(panel_info.vl_bpix)) {
case 16:
lcdc_writel(®s->lcdc_basecfg1,
LCDC_BASECFG1_RGBMODE_16BPP_RGB_565);
break;
default:
BUG();
break;
}
lcdc_writel(®s->lcdc_basecfg2, LCDC_BASECFG2_XSTRIDE(0));
lcdc_writel(®s->lcdc_basecfg3, 0);
lcdc_writel(®s->lcdc_basecfg4, LCDC_BASECFG4_DMA);
/* Disable all interrupts */
lcdc_writel(®s->lcdc_lcdidr, ~0UL);
lcdc_writel(®s->lcdc_baseidr, ~0UL);
/* Setup the DMA descriptor, this descriptor will loop to itself */
desc = (struct lcd_dma_desc *)(lcdbase - 16);
desc->address = (u32)lcdbase;
/* Disable DMA transfer interrupt & descriptor loaded interrupt. */
desc->control = LCDC_BASECTRL_ADDIEN | LCDC_BASECTRL_DSCRIEN
| LCDC_BASECTRL_DMAIEN | LCDC_BASECTRL_DFETCH;
desc->next = (u32)desc;
lcdc_writel(®s->lcdc_baseaddr, desc->address);
lcdc_writel(®s->lcdc_basectrl, desc->control);
lcdc_writel(®s->lcdc_basenext, desc->next);
lcdc_writel(®s->lcdc_basecher, LCDC_BASECHER_CHEN |
LCDC_BASECHER_UPDATEEN);
/* Enable LCD */
value = lcdc_readl(®s->lcdc_lcden);
lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_CLKEN);
while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_CLKSTS))
udelay(1);
value = lcdc_readl(®s->lcdc_lcden);
lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_SYNCEN);
while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_LCDSTS))
udelay(1);
value = lcdc_readl(®s->lcdc_lcden);
lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_DISPEN);
while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_DISPSTS))
udelay(1);
value = lcdc_readl(®s->lcdc_lcden);
lcdc_writel(®s->lcdc_lcden, value | LCDC_LCDEN_PWMEN);
while (!(lcdc_readl(®s->lcdc_lcdsr) & LCDC_LCDSR_PWMSTS))
udelay(1);
}