drivers/video/atmel_lcdfb.c

   1 /*
   2  * Driver for AT91/AT32 LCD Controller
   3  *
   4  * Copyright (C) 2007 Atmel Corporation
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <asm/io.h>
  27 #include <asm/arch/gpio.h>
  28 #include <asm/arch/clk.h>
  29 #include <lcd.h>
  30 #include <atmel_lcdc.h>
  31
  32 void *lcd_base;                         /* Start of framebuffer memory  */
  33
  34 /* configurable parameters */
  35 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  36 #define ATMEL_LCDC_DMA_BURST_LEN        8
  37 #ifndef ATMEL_LCDC_GUARD_TIME
  38 #define ATMEL_LCDC_GUARD_TIME           1
  39 #endif
  40
  41 #if defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91CAP9)
  42 #define ATMEL_LCDC_FIFO_SIZE            2048
  43 #else
  44 #define ATMEL_LCDC_FIFO_SIZE            512
  45 #endif
  46
  47 #define lcdc_readl(mmio, reg)           __raw_readl((mmio)+(reg))
  48 #define lcdc_writel(mmio, reg, val)     __raw_writel((val), (mmio)+(reg))
  49
  50 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
  51 {
  52 #if defined(CONFIG_ATMEL_LCD_BGR555)
  53         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  54                     (red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
  55 #else
  56         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  57                     (blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
  58 #endif
  59 }
  60
  61 void lcd_ctrl_init(void *lcdbase)
  62 {
  63         unsigned long value;
  64
  65         /* Turn off the LCD controller and the DMA controller */
  66         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
  67                     ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
  68
  69         /* Wait for the LCDC core to become idle */
  70         while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
  71                 udelay(10);
  72
  73         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
  74
  75         /* Reset LCDC DMA */
  76         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
  77
  78         /* ...set frame size and burst length = 8 words (?) */
  79         value = (panel_info.vl_col * panel_info.vl_row *
  80                  NBITS(panel_info.vl_bpix)) / 32;
  81         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
  82         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
  83
  84         /* Set pixel clock */
  85         value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
  86         if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
  87                 value++;
  88         value = (value / 2) - 1;
  89
  90         if (!value) {
  91                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
  92         } else
  93                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
  94                             value << ATMEL_LCDC_CLKVAL_OFFSET);
  95
  96         /* Initialize control register 2 */
  97 #ifdef CONFIG_AVR32
  98         value = ATMEL_LCDC_MEMOR_BIG | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
  99 #else
 100         value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 101 #endif
 102         if (panel_info.vl_tft)
 103                 value |= ATMEL_LCDC_DISTYPE_TFT;
 104
 105         value |= panel_info.vl_sync;
 106         value |= (panel_info.vl_bpix << 5);
 107         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
 108
 109         /* Vertical timing */
 110         value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 111         value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
 112         value |= panel_info.vl_lower_margin;
 113         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
 114
 115         /* Horizontal timing */
 116         value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 117         value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 118         value |= (panel_info.vl_left_margin - 1);
 119         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
 120
 121         /* Display size */
 122         value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 123         value |= panel_info.vl_row - 1;
 124         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
 125
 126         /* FIFO Threshold: Use formula from data sheet */
 127         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 128         lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
 129
 130         /* Toggle LCD_MODE every frame */
 131         lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
 132
 133         /* Disable all interrupts */
 134         lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
 135
 136         /* Set contrast */
 137         value = ATMEL_LCDC_PS_DIV8 |
 138                 ATMEL_LCDC_ENA_PWMENABLE;
 139         if (!panel_info.vl_cont_pol_low)
 140                 value |= ATMEL_LCDC_POL_POSITIVE;
 141         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
 142         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 143
 144         /* Set framebuffer DMA base address and pixel offset */
 145         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
 146
 147         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
 148         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
 149                     (ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 150 }
 151
 152 ulong calc_fbsize(void)
 153 {
 154         return ((panel_info.vl_col * panel_info.vl_row *
 155                 NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
 156 }