common/fdt_simplefb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Simplefb device tree support
   4  *
   5  * (C) Copyright 2015
   6  * Stephen Warren <swarren@wwwdotorg.org>
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <lcd.h>
  12 #include <fdt_support.h>
  13 #include <asm/global_data.h>
  14 #include <linux/libfdt.h>
  15 #include <video.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 static int fdt_simplefb_configure_node(void *blob, int off)
  20 {
  21         int xsize, ysize;
  22         int bpix; /* log2 of bits per pixel */
  23         const char *name;
  24         ulong fb_base;
  25 #ifdef CONFIG_DM_VIDEO
  26         struct video_uc_plat *plat;
  27         struct video_priv *uc_priv;
  28         struct udevice *dev;
  29         int ret;
  30
  31         ret = uclass_first_device_err(UCLASS_VIDEO, &dev);
  32         if (ret)
  33                 return ret;
  34         uc_priv = dev_get_uclass_priv(dev);
  35         plat = dev_get_uclass_plat(dev);
  36         xsize = uc_priv->xsize;
  37         ysize = uc_priv->ysize;
  38         bpix = uc_priv->bpix;
  39         fb_base = plat->base;
  40 #else
  41         xsize = lcd_get_pixel_width();
  42         ysize = lcd_get_pixel_height();
  43         bpix = LCD_BPP;
  44         fb_base = gd->fb_base;
  45 #endif
  46         switch (bpix) {
  47         case 4: /* VIDEO_BPP16 */
  48                 name = "r5g6b5";
  49                 break;
  50         case 5: /* VIDEO_BPP32 */
  51                 name = "a8r8g8b8";
  52                 break;
  53         default:
  54                 return -EINVAL;
  55         }
  56
  57         return fdt_setup_simplefb_node(blob, off, fb_base, xsize, ysize,
  58                                        xsize * (1 << bpix) / 8, name);
  59 }
  60
  61 int fdt_simplefb_add_node(void *blob)
  62 {
  63         static const char compat[] = "simple-framebuffer";
  64         static const char disabled[] = "disabled";
  65         int off, ret;
  66
  67         off = fdt_add_subnode(blob, 0, "framebuffer");
  68         if (off < 0)
  69                 return -1;
  70
  71         ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
  72         if (ret < 0)
  73                 return -1;
  74
  75         ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
  76         if (ret < 0)
  77                 return -1;
  78
  79         return fdt_simplefb_configure_node(blob, off);
  80 }
  81
  82 int fdt_simplefb_enable_existing_node(void *blob)
  83 {
  84         int off;
  85
  86         off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
  87         if (off < 0)
  88                 return -1;
  89
  90         return fdt_simplefb_configure_node(blob, off);
  91 }
  92
  93 #if CONFIG_IS_ENABLED(DM_VIDEO)
  94 int fdt_simplefb_enable_and_mem_rsv(void *blob)
  95 {
  96         struct fdt_memory mem;
  97         int ret;
  98
  99         /* nothing to do when video is not active */
 100         if (!video_is_active())
 101                 return 0;
 102
 103         ret = fdt_simplefb_enable_existing_node(blob);
 104         if (ret)
 105                 return ret;
 106
 107         /* nothing to do when the frame buffer is not defined */
 108         if (gd->video_bottom == gd->video_top)
 109                 return 0;
 110
 111         /* reserved with no-map tag the video buffer */
 112         mem.start = gd->video_bottom;
 113         mem.end = gd->video_top - 1;
 114
 115         return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
 116                                           FDTDEC_RESERVED_MEMORY_NO_MAP);
 117 }
 118 #endif