mirror of
https://github.com/brain-hackers/u-boot-brain
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161 lines
5.1 KiB
C
161 lines
5.1 KiB
C
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/*
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* Driver for AT91/AT32 LCD Controller
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*
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* Copyright (C) 2007 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/clk.h>
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#include <lcd.h>
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#include <atmel_lcdc.h>
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int lcd_line_length;
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int lcd_color_fg;
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int lcd_color_bg;
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void *lcd_base; /* Start of framebuffer memory */
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void *lcd_console_address; /* Start of console buffer */
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short console_col;
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short console_row;
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/* configurable parameters */
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#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
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#define ATMEL_LCDC_DMA_BURST_LEN 8
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#if defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91CAP9)
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#define ATMEL_LCDC_FIFO_SIZE 2048
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#else
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#define ATMEL_LCDC_FIFO_SIZE 512
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#endif
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#define lcdc_readl(mmio, reg) __raw_readl((mmio)+(reg))
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#define lcdc_writel(mmio, reg, val) __raw_writel((val), (mmio)+(reg))
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void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
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{
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#if defined(CONFIG_ATMEL_LCD_BGR555)
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
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(red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
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#else
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
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(blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
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#endif
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}
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void lcd_ctrl_init(void *lcdbase)
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{
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unsigned long value;
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/* Turn off the LCD controller and the DMA controller */
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
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1 << ATMEL_LCDC_GUARDT_OFFSET);
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/* Wait for the LCDC core to become idle */
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while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
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udelay(10);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
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/* Reset LCDC DMA */
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
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/* ...set frame size and burst length = 8 words (?) */
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value = (panel_info.vl_col * panel_info.vl_row *
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NBITS(panel_info.vl_bpix)) / 32;
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value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
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/* Set pixel clock */
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value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
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if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
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value++;
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value = (value / 2) - 1;
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if (!value) {
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
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} else
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
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value << ATMEL_LCDC_CLKVAL_OFFSET);
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/* Initialize control register 2 */
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value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
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if (panel_info.vl_tft)
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value |= ATMEL_LCDC_DISTYPE_TFT;
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if (!(panel_info.vl_sync & ATMEL_LCDC_INVLINE_INVERTED))
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value |= ATMEL_LCDC_INVLINE_INVERTED;
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if (!(panel_info.vl_sync & ATMEL_LCDC_INVFRAME_INVERTED))
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value |= ATMEL_LCDC_INVFRAME_INVERTED;
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value |= (panel_info.vl_bpix << 5);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
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/* Vertical timing */
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value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
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value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
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value |= panel_info.vl_lower_margin;
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
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/* Horizontal timing */
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value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
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value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
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value |= (panel_info.vl_left_margin - 1);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
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/* Display size */
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value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
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value |= panel_info.vl_row - 1;
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
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/* FIFO Threshold: Use formula from data sheet */
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value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
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/* Toggle LCD_MODE every frame */
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
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/* Disable all interrupts */
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
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/* Set contrast */
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value = ATMEL_LCDC_PS_DIV8 |
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ATMEL_LCDC_POL_POSITIVE |
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ATMEL_LCDC_ENA_PWMENABLE;
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
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/* Set framebuffer DMA base address and pixel offset */
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
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lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
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(1 << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
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}
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ulong calc_fbsize(void)
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{
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return ((panel_info.vl_col * panel_info.vl_row *
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NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
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}
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