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 <atmel_lcd.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <video.h>
  14 #include <asm/io.h>
  15 #include <asm/arch/gpio.h>
  16 #include <asm/arch/clk.h>
  17 #include <lcd.h>
  18 #include <bmp_layout.h>
  19 #include <atmel_lcdc.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 #ifdef CONFIG_DM_VIDEO
  24 enum {
  25         /* Maximum LCD size we support */
  26         LCD_MAX_WIDTH           = 1366,
  27         LCD_MAX_HEIGHT          = 768,
  28         LCD_MAX_LOG2_BPP        = VIDEO_BPP16,
  29 };
  30 #endif
  31
  32 struct atmel_fb_priv {
  33         struct display_timing timing;
  34 };
  35
  36 /* configurable parameters */
  37 #define ATMEL_LCDC_CVAL_DEFAULT         0xc8
  38 #define ATMEL_LCDC_DMA_BURST_LEN        8
  39 #ifndef ATMEL_LCDC_GUARD_TIME
  40 #define ATMEL_LCDC_GUARD_TIME           1
  41 #endif
  42
  43 #if defined(CONFIG_AT91SAM9263)
  44 #define ATMEL_LCDC_FIFO_SIZE            2048
  45 #else
  46 #define ATMEL_LCDC_FIFO_SIZE            512
  47 #endif
  48
  49 #define lcdc_readl(mmio, reg)           __raw_readl((mmio)+(reg))
  50 #define lcdc_writel(mmio, reg, val)     __raw_writel((val), (mmio)+(reg))
  51
  52 #ifndef CONFIG_DM_VIDEO
  53 ushort *configuration_get_cmap(void)
  54 {
  55         return (ushort *)(panel_info.mmio + ATMEL_LCDC_LUT(0));
  56 }
  57
  58 #if defined(CONFIG_BMP_16BPP) && defined(CONFIG_ATMEL_LCD_BGR555)
  59 void fb_put_word(uchar **fb, uchar **from)
  60 {
  61         *(*fb)++ = (((*from)[0] & 0x1f) << 2) | ((*from)[1] & 0x03);
  62         *(*fb)++ = ((*from)[0] & 0xe0) | (((*from)[1] & 0x7c) >> 2);
  63         *from += 2;
  64 }
  65 #endif
  66
  67 #ifdef CONFIG_LCD_LOGO
  68 #include <bmp_logo.h>
  69 void lcd_logo_set_cmap(void)
  70 {
  71         int i;
  72         uint lut_entry;
  73         ushort colreg;
  74         uint *cmap = (uint *)configuration_get_cmap();
  75
  76         for (i = 0; i < BMP_LOGO_COLORS; ++i) {
  77                 colreg = bmp_logo_palette[i];
  78 #ifdef CONFIG_ATMEL_LCD_BGR555
  79                 lut_entry = ((colreg & 0x000F) << 11) |
  80                                 ((colreg & 0x00F0) <<  2) |
  81                                 ((colreg & 0x0F00) >>  7);
  82 #else
  83                 lut_entry = ((colreg & 0x000F) << 1) |
  84                                 ((colreg & 0x00F0) << 3) |
  85                                 ((colreg & 0x0F00) << 4);
  86 #endif
  87                 *(cmap + BMP_LOGO_OFFSET) = lut_entry;
  88                 cmap++;
  89         }
  90 }
  91 #endif
  92
  93 void lcd_setcolreg(ushort regno, ushort red, ushort green, ushort blue)
  94 {
  95 #if defined(CONFIG_ATMEL_LCD_BGR555)
  96         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
  97                     (red >> 3) | ((green & 0xf8) << 2) | ((blue & 0xf8) << 7));
  98 #else
  99         lcdc_writel(panel_info.mmio, ATMEL_LCDC_LUT(regno),
 100                     (blue >> 3) | ((green & 0xfc) << 3) | ((red & 0xf8) << 8));
 101 #endif
 102 }
 103
 104 void lcd_set_cmap(struct bmp_image *bmp, unsigned colors)
 105 {
 106         int i;
 107
 108         for (i = 0; i < colors; ++i) {
 109                 struct bmp_color_table_entry cte = bmp->color_table[i];
 110                 lcd_setcolreg(i, cte.red, cte.green, cte.blue);
 111         }
 112 }
 113 #endif
 114
 115 static void atmel_fb_init(ulong addr, struct display_timing *timing, int bpix,
 116                           bool tft, bool cont_pol_low, ulong lcdbase)
 117 {
 118         unsigned long value;
 119         void *reg = (void *)addr;
 120
 121         /* Turn off the LCD controller and the DMA controller */
 122         lcdc_writel(reg, ATMEL_LCDC_PWRCON,
 123                     ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET);
 124
 125         /* Wait for the LCDC core to become idle */
 126         while (lcdc_readl(reg, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
 127                 udelay(10);
 128
 129         lcdc_writel(reg, ATMEL_LCDC_DMACON, 0);
 130
 131         /* Reset LCDC DMA */
 132         lcdc_writel(reg, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMARST);
 133
 134         /* ...set frame size and burst length = 8 words (?) */
 135         value = (timing->hactive.typ * timing->vactive.typ *
 136                  (1 << bpix)) / 32;
 137         value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);
 138         lcdc_writel(reg, ATMEL_LCDC_DMAFRMCFG, value);
 139
 140         /* Set pixel clock */
 141         value = get_lcdc_clk_rate(0) / timing->pixelclock.typ;
 142         if (get_lcdc_clk_rate(0) % timing->pixelclock.typ)
 143                 value++;
 144         value = (value / 2) - 1;
 145
 146         if (!value) {
 147                 lcdc_writel(reg, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);
 148         } else
 149                 lcdc_writel(reg, ATMEL_LCDC_LCDCON1,
 150                             value << ATMEL_LCDC_CLKVAL_OFFSET);
 151
 152         /* Initialize control register 2 */
 153         value = ATMEL_LCDC_MEMOR_LITTLE | ATMEL_LCDC_CLKMOD_ALWAYSACTIVE;
 154         if (tft)
 155                 value |= ATMEL_LCDC_DISTYPE_TFT;
 156
 157         if (!(timing->flags & DISPLAY_FLAGS_HSYNC_HIGH))
 158                 value |= ATMEL_LCDC_INVLINE_INVERTED;
 159         if (!(timing->flags & DISPLAY_FLAGS_VSYNC_HIGH))
 160                 value |= ATMEL_LCDC_INVFRAME_INVERTED;
 161         value |= bpix << 5;
 162         lcdc_writel(reg, ATMEL_LCDC_LCDCON2, value);
 163
 164         /* Vertical timing */
 165         value = (timing->vsync_len.typ - 1) << ATMEL_LCDC_VPW_OFFSET;
 166         value |= timing->vback_porch.typ << ATMEL_LCDC_VBP_OFFSET;
 167         value |= timing->vfront_porch.typ;
 168         /* Magic! (Datasheet says "Bit 31 must be written to 1") */
 169         value |= 1U << 31;
 170         lcdc_writel(reg, ATMEL_LCDC_TIM1, value);
 171
 172         /* Horizontal timing */
 173         value = (timing->hfront_porch.typ - 1) << ATMEL_LCDC_HFP_OFFSET;
 174         value |= (timing->hsync_len.typ - 1) << ATMEL_LCDC_HPW_OFFSET;
 175         value |= (timing->hback_porch.typ - 1);
 176         lcdc_writel(reg, ATMEL_LCDC_TIM2, value);
 177
 178         /* Display size */
 179         value = (timing->hactive.typ - 1) << ATMEL_LCDC_HOZVAL_OFFSET;
 180         value |= timing->vactive.typ - 1;
 181         lcdc_writel(reg, ATMEL_LCDC_LCDFRMCFG, value);
 182
 183         /* FIFO Threshold: Use formula from data sheet */
 184         value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);
 185         lcdc_writel(reg, ATMEL_LCDC_FIFO, value);
 186
 187         /* Toggle LCD_MODE every frame */
 188         lcdc_writel(reg, ATMEL_LCDC_MVAL, 0);
 189
 190         /* Disable all interrupts */
 191         lcdc_writel(reg, ATMEL_LCDC_IDR, ~0UL);
 192
 193         /* Set contrast */
 194         value = ATMEL_LCDC_PS_DIV8 |
 195                 ATMEL_LCDC_ENA_PWMENABLE;
 196         if (!cont_pol_low)
 197                 value |= ATMEL_LCDC_POL_POSITIVE;
 198         lcdc_writel(reg, ATMEL_LCDC_CONTRAST_CTR, value);
 199         lcdc_writel(reg, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);
 200
 201         /* Set framebuffer DMA base address and pixel offset */
 202         lcdc_writel(reg, ATMEL_LCDC_DMABADDR1, lcdbase);
 203
 204         lcdc_writel(reg, ATMEL_LCDC_DMACON, ATMEL_LCDC_DMAEN);
 205         lcdc_writel(reg, ATMEL_LCDC_PWRCON,
 206                     (ATMEL_LCDC_GUARD_TIME << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);
 207 }
 208
 209 #ifndef CONFIG_DM_VIDEO
 210 void lcd_ctrl_init(void *lcdbase)
 211 {
 212         struct display_timing timing;
 213
 214         timing.flags = 0;
 215         if (!(panel_info.vl_sync & ATMEL_LCDC_INVLINE_INVERTED))
 216                 timing.flags |= DISPLAY_FLAGS_HSYNC_HIGH;
 217         if (!(panel_info.vl_sync & ATMEL_LCDC_INVFRAME_INVERTED))
 218                 timing.flags |= DISPLAY_FLAGS_VSYNC_LOW;
 219         timing.pixelclock.typ = panel_info.vl_clk;
 220
 221         timing.hactive.typ = panel_info.vl_col;
 222         timing.hfront_porch.typ = panel_info.vl_right_margin;
 223         timing.hback_porch.typ = panel_info.vl_left_margin;
 224         timing.hsync_len.typ = panel_info.vl_hsync_len;
 225
 226         timing.vactive.typ = panel_info.vl_row;
 227         timing.vfront_porch.typ = panel_info.vl_clk;
 228         timing.vback_porch.typ = panel_info.vl_clk;
 229         timing.vsync_len.typ = panel_info.vl_clk;
 230
 231         atmel_fb_init(panel_info.mmio, &timing, panel_info.vl_bpix,
 232                       panel_info.vl_tft, panel_info.vl_cont_pol_low,
 233                       (ulong)lcdbase);
 234 }
 235
 236 ulong calc_fbsize(void)
 237 {
 238         return ((panel_info.vl_col * panel_info.vl_row *
 239                 NBITS(panel_info.vl_bpix)) / 8) + PAGE_SIZE;
 240 }
 241 #endif
 242
 243 #ifdef CONFIG_DM_VIDEO
 244 static int atmel_fb_lcd_probe(struct udevice *dev)
 245 {
 246         struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
 247         struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 248         struct atmel_fb_priv *priv = dev_get_priv(dev);
 249         struct display_timing *timing = &priv->timing;
 250
 251         /*
 252          * For now some values are hard-coded. We could use the device tree
 253          * bindings in simple-framebuffer.txt to specify the format/bpp and
 254          * some Atmel-specific binding for tft and cont_pol_low.
 255          */
 256         atmel_fb_init(ATMEL_BASE_LCDC, timing, VIDEO_BPP16, true, false,
 257                       uc_plat->base);
 258         uc_priv->xsize = timing->hactive.typ;
 259         uc_priv->ysize = timing->vactive.typ;
 260         uc_priv->bpix = VIDEO_BPP16;
 261         video_set_flush_dcache(dev, true);
 262         debug("LCD frame buffer at %lx, size %x, %dx%d pixels\n", uc_plat->base,
 263               uc_plat->size, uc_priv->xsize, uc_priv->ysize);
 264
 265         return 0;
 266 }
 267
 268 static int atmel_fb_ofdata_to_platdata(struct udevice *dev)
 269 {
 270         struct atmel_lcd_platdata *plat = dev_get_platdata(dev);
 271         struct atmel_fb_priv *priv = dev_get_priv(dev);
 272         struct display_timing *timing = &priv->timing;
 273         const void *blob = gd->fdt_blob;
 274
 275         if (fdtdec_decode_display_timing(blob, dev_of_offset(dev),
 276                                          plat->timing_index, timing)) {
 277                 debug("%s: Failed to decode display timing\n", __func__);
 278                 return -EINVAL;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static int atmel_fb_lcd_bind(struct udevice *dev)
 285 {
 286         struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev);
 287
 288         uc_plat->size = LCD_MAX_WIDTH * LCD_MAX_HEIGHT *
 289                         (1 << VIDEO_BPP16) / 8;
 290         debug("%s: Frame buffer size %x\n", __func__, uc_plat->size);
 291
 292         return 0;
 293 }
 294
 295 static const struct udevice_id atmel_fb_lcd_ids[] = {
 296         { .compatible = "atmel,at91sam9g45-lcdc" },
 297         { }
 298 };
 299
 300 U_BOOT_DRIVER(atmel_fb) = {
 301         .name   = "atmel_fb",
 302         .id     = UCLASS_VIDEO,
 303         .of_match = atmel_fb_lcd_ids,
 304         .bind   = atmel_fb_lcd_bind,
 305         .ofdata_to_platdata     = atmel_fb_ofdata_to_platdata,
 306         .probe  = atmel_fb_lcd_probe,
 307         .platdata_auto_alloc_size = sizeof(struct atmel_lcd_platdata),
 308         .priv_auto_alloc_size   = sizeof(struct atmel_fb_priv),
 309 };
 310 #endif