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 int lcd_line_length;
  33 int lcd_color_fg;
  34 int lcd_color_bg;
  35
  36 void *lcd_base;                         /* Start of framebuffer memory  */
  37 void *lcd_console_address;              /* Start of console buffer      */
  38
  39 short console_col;
  40 short console_row;
  41
  42 /* configurable parameters */
  43 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  44 #define ATMEL_LCDC_DMA_BURST_LEN        8
  45 #ifndef ATMEL_LCDC_GUARD_TIME
  46 #define ATMEL_LCDC_GUARD_TIME           1
  47 #endif
  48
  49 #if defined(CONFIG_AT91SAM9263) || defined(CONFIG_AT91CAP9)
  50 #define ATMEL_LCDC_FIFO_SIZE            2048
  51 #else
  52 #define ATMEL_LCDC_FIFO_SIZE            512
  53 #endif
  54
  55 #define lcdc_readl(mmio, reg)           __raw_readl((mmio)+(reg))
  56 #define lcdc_writel(mmio, reg, val)     __raw_writel((val), (mmio)+(reg))
  57
  58 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
  59 {
  60 #if defined(CONFIG_ATMEL_LCD_BGR555)
  61         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  62                     (red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
  63 #else
  64         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  65                     (blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
  66 #endif
  67 }
  68
  69 void lcd_ctrl_init(void *lcdbase)
  70 {
  71         unsigned long value;
  72
  73         /* Turn off the LCD controller and the DMA controller */
  74         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
  75                     ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
  76
  77         /* Wait for the LCDC core to become idle */
  78         while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
  79                 udelay(10);
  80
  81         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
  82
  83         /* Reset LCDC DMA */
  84         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
  85
  86         /* ...set frame size and burst length = 8 words (?) */
  87         value = (panel_info.vl_col * panel_info.vl_row *
  88                  NBITS(panel_info.vl_bpix)) / 32;
  89         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
  90         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
  91
  92         /* Set pixel clock */
  93         value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
  94         if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
  95                 value++;
  96         value = (value / 2) - 1;
  97
  98         if (!value) {
  99                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 100         } else
 101                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
 102                             value << ATMEL_LCDC_CLKVAL_OFFSET);
 103
 104         /* Initialize control register 2 */
 105 #ifdef CONFIG_AVR32
 106         value = ATMEL_LCDC_MEMOR_BIG | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 107 #else
 108         value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 109 #endif
 110         if (panel_info.vl_tft)
 111                 value |= ATMEL_LCDC_DISTYPE_TFT;
 112
 113         value |= panel_info.vl_sync;
 114         value |= (panel_info.vl_bpix << 5);
 115         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
 116
 117         /* Vertical timing */
 118         value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 119         value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
 120         value |= panel_info.vl_lower_margin;
 121         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
 122
 123         /* Horizontal timing */
 124         value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 125         value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 126         value |= (panel_info.vl_left_margin - 1);
 127         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
 128
 129         /* Display size */
 130         value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 131         value |= panel_info.vl_row - 1;
 132         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
 133
 134         /* FIFO Threshold: Use formula from data sheet */
 135         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 136         lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
 137
 138         /* Toggle LCD_MODE every frame */
 139         lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
 140
 141         /* Disable all interrupts */
 142         lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
 143
 144         /* Set contrast */
 145         value = ATMEL_LCDC_PS_DIV8 |
 146                 ATMEL_LCDC_ENA_PWMENABLE;
 147         if (!panel_info.vl_cont_pol_low)
 148                 value |= ATMEL_LCDC_POL_POSITIVE;
 149         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
 150         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 151
 152         /* Set framebuffer DMA base address and pixel offset */
 153         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
 154
 155         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
 156         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
 157                     (ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 158 }
 159
 160 ulong calc_fbsize(void)
 161 {
 162         return ((panel_info.vl_col * panel_info.vl_row *
 163                 NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
 164 }