LXR uboot/drivers/video/simplefb.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2017 Rob Clark
   4 */
   5
   6#include <common.h>
   7#include <dm.h>
   8#include <fdtdec.h>
   9#include <fdt_support.h>
  10#include <log.h>
  11#include <video.h>
  12#include <asm/global_data.h>
  13
  14static int simple_video_probe(struct udevice *dev)
  15{
  16        struct video_uc_plat *plat = dev_get_uclass_plat(dev);
  17        struct video_priv *uc_priv = dev_get_uclass_priv(dev);
  18        const void *blob = gd->fdt_blob;
  19        const int node = dev_of_offset(dev);
  20        const char *format;
  21        fdt_addr_t base;
  22        fdt_size_t size;
  23
  24        base = fdtdec_get_addr_size_auto_parent(blob, dev_of_offset(dev->parent),
  25                        node, "reg", 0, &size, false);
  26        if (base == FDT_ADDR_T_NONE) {
  27                debug("%s: Failed to decode memory region\n", __func__);
  28                return -EINVAL;
  29        }
  30
  31        debug("%s: base=%llx, size=%llu\n", __func__, base, size);
  32
  33        /*
  34         * TODO is there some way to reserve the framebuffer
  35         * region so it isn't clobbered?
  36         */
  37        plat->base = base;
  38        plat->size = size;
  39
  40        video_set_flush_dcache(dev, true);
  41
  42        debug("%s: Query resolution...\n", __func__);
  43
  44        uc_priv->xsize = fdtdec_get_uint(blob, node, "width", 0);
  45        uc_priv->ysize = fdtdec_get_uint(blob, node, "height", 0);
  46        uc_priv->rot = 0;
  47
  48        format = fdt_getprop(blob, node, "format", NULL);
  49        debug("%s: %dx%d@%s\n", __func__, uc_priv->xsize, uc_priv->ysize, format);
  50
  51        if (strcmp(format, "r5g6b5") == 0) {
  52                uc_priv->bpix = VIDEO_BPP16;
  53        } else if (strcmp(format, "a8b8g8r8") == 0) {
  54                uc_priv->bpix = VIDEO_BPP32;
  55        } else {
  56                printf("%s: invalid format: %s\n", __func__, format);
  57                return -EINVAL;
  58        }
  59
  60        return 0;
  61}
  62
  63static const struct udevice_id simple_video_ids[] = {
  64        { .compatible = "simple-framebuffer" },
  65        { }
  66};
  67
  68U_BOOT_DRIVER(simple_video) = {
  69        .name   = "simple_video",
  70        .id     = UCLASS_VIDEO,
  71        .of_match = simple_video_ids,
  72        .probe  = simple_video_probe,
  73};
  74