drivers/video/atmel_lcdfb.c

   1 /*
   2  * Driver for AT91/AT32 LCD Controller
   3  *
   4  * Copyright (C) 2007 Atmel Corporation
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/gpio.h>
  12 #include <asm/arch/clk.h>
  13 #include <lcd.h>
  14 #include <bmp_layout.h>
  15 #include <atmel_lcdc.h>
  16
  17 /* configurable parameters */
  18 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  19 #define ATMEL_LCDC_DMA_BURST_LEN        8
  20 #ifndef ATMEL_LCDC_GUARD_TIME
  21 #define ATMEL_LCDC_GUARD_TIME           1
  22 #endif
  23
  24 #if defined(CONFIG_AT91SAM9263)
  25 #define ATMEL_LCDC_FIFO_SIZE            2048
  26 #else
  27 #define ATMEL_LCDC_FIFO_SIZE            512
  28 #endif
  29
  30 #define lcdc_readl(mmio, reg)           __raw_readl((mmio)+(reg))
  31 #define lcdc_writel(mmio, reg, val)     __raw_writel((val), (mmio)+(reg))
  32
  33 ushort *configuration_get_cmap(void)
  34 {
  35         return (ushort *)(panel_info.mmio + ATMEL_LCDC_LUT(0));
  36 }
  37
  38 #if defined(CONFIG_BMP_16BPP) && defined(CONFIG_ATMEL_LCD_BGR555)
  39 void fb_put_word(uchar **fb, uchar **from)
  40 {
  41         *(*fb)++ = (((*from)[0] & 0x1f) << 2) | ((*from)[1] & 0x03);
  42         *(*fb)++ = ((*from)[0] & 0xe0) | (((*from)[1] & 0x7c) >> 2);
  43         *from += 2;
  44 }
  45 #endif
  46
  47 #ifdef CONFIG_LCD_LOGO
  48 #include <bmp_logo.h>
  49 void lcd_logo_set_cmap(void)
  50 {
  51         int i;
  52         uint lut_entry;
  53         ushort colreg;
  54         uint *cmap = (uint *)configuration_get_cmap();
  55
  56         for (i = 0; i < BMP_LOGO_COLORS; ++i) {
  57                 colreg = bmp_logo_palette[i];
  58 #ifdef CONFIG_ATMEL_LCD_BGR555
  59                 lut_entry = ((colreg & 0x000F) << 11) |
  60                                 ((colreg & 0x00F0) <<  2) |
  61                                 ((colreg & 0x0F00) >>  7);
  62 #else
  63                 lut_entry = ((colreg & 0x000F) << 1) |
  64                                 ((colreg & 0x00F0) << 3) |
  65                                 ((colreg & 0x0F00) << 4);
  66 #endif
  67                 *(cmap + BMP_LOGO_OFFSET) = lut_entry;
  68                 cmap++;
  69         }
  70 }
  71 #endif
  72
  73 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
  74 {
  75 #if defined(CONFIG_ATMEL_LCD_BGR555)
  76         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  77                     (red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
  78 #else
  79         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  80                     (blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
  81 #endif
  82 }
  83
  84 void lcd_set_cmap(struct bmp_image *bmp, unsigned colors)
  85 {
  86         int i;
  87
  88         for (i = 0; i < colors; ++i) {
  89                 struct bmp_color_table_entry cte = bmp->color_table[i];
  90                 lcd_setcolreg(i, cte.red, cte.green, cte.blue);
  91         }
  92 }
  93
  94 void lcd_ctrl_init(void *lcdbase)
  95 {
  96         unsigned long value;
  97
  98         /* Turn off the LCD controller and the DMA controller */
  99         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
 100                     ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
 101
 102         /* Wait for the LCDC core to become idle */
 103         while (lcdc_readl(panel_info.mmio, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 104                 udelay(10);
 105
 106         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, 0);
 107
 108         /* Reset LCDC DMA */
 109         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
 110
 111         /* ...set frame size and burst length = 8 words (?) */
 112         value = (panel_info.vl_col * panel_info.vl_row *
 113                  NBITS(panel_info.vl_bpix)) / 32;
 114         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 115         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMAFRMCFG, value);
 116
 117         /* Set pixel clock */
 118         value = get_lcdc_clk_rate(0) / panel_info.vl_clk;
 119         if (get_lcdc_clk_rate(0) % panel_info.vl_clk)
 120                 value++;
 121         value = (value / 2) - 1;
 122
 123         if (!value) {
 124                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 125         } else
 126                 lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON1,
 127                             value << ATMEL_LCDC_CLKVAL_OFFSET);
 128
 129         /* Initialize control register 2 */
 130 #ifdef CONFIG_AVR32
 131         value = ATMEL_LCDC_MEMOR_BIG | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 132 #else
 133         value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 134 #endif
 135         if (panel_info.vl_tft)
 136                 value |= ATMEL_LCDC_DISTYPE_TFT;
 137
 138         value |= panel_info.vl_sync;
 139         value |= (panel_info.vl_bpix << 5);
 140         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDCON2, value);
 141
 142         /* Vertical timing */
 143         value = (panel_info.vl_vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;
 144         value |= panel_info.vl_upper_margin << ATMEL_LCDC_VBP_OFFSET;
 145         value |= panel_info.vl_lower_margin;
 146         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM1, value);
 147
 148         /* Horizontal timing */
 149         value = (panel_info.vl_right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;
 150         value |= (panel_info.vl_hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;
 151         value |= (panel_info.vl_left_margin - 1);
 152         lcdc_writel(panel_info.mmio, ATMEL_LCDC_TIM2, value);
 153
 154         /* Display size */
 155         value = (panel_info.vl_col - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 156         value |= panel_info.vl_row - 1;
 157         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LCDFRMCFG, value);
 158
 159         /* FIFO Threshold: Use formula from data sheet */
 160         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 161         lcdc_writel(panel_info.mmio, ATMEL_LCDC_FIFO, value);
 162
 163         /* Toggle LCD_MODE every frame */
 164         lcdc_writel(panel_info.mmio, ATMEL_LCDC_MVAL, 0);
 165
 166         /* Disable all interrupts */
 167         lcdc_writel(panel_info.mmio, ATMEL_LCDC_IDR, ~0UL);
 168
 169         /* Set contrast */
 170         value = ATMEL_LCDC_PS_DIV8 |
 171                 ATMEL_LCDC_ENA_PWMENABLE;
 172         if (!panel_info.vl_cont_pol_low)
 173                 value |= ATMEL_LCDC_POL_POSITIVE;
 174         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_CTR, value);
 175         lcdc_writel(panel_info.mmio, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 176
 177         /* Set framebuffer DMA base address and pixel offset */
 178         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMABADDR1, (u_long)lcdbase);
 179
 180         lcdc_writel(panel_info.mmio, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
 181         lcdc_writel(panel_info.mmio, ATMEL_LCDC_PWRCON,
 182                     (ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 183 }
 184
 185 ulong calc_fbsize(void)
 186 {
 187         return ((panel_info.vl_col * panel_info.vl_row *
 188                 NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
 189 }