/* * Driver for AT91/AT32 LCD Controller * * Copyright (C) 2007 Atmel Corporation * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <asm/io.h> #include <asm/arch/gpio.h> #include <asm/arch/clk.h> #include <lcd.h> #include <atmel_lcdc.h> int lcd_line_length; int lcd_color_fg; int lcd_color_bg; void *lcd_base; /* Start of framebuffer memory */ void *lcd_console_address; /* Start of console buffer */ short console_col; short console_row; /* 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; }