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// SPDX-License-Identifier: GPL-2.0+
/*
* Simplefb device tree support
*
* (C) Copyright 2015
* Stephen Warren <swarren@wwwdotorg.org>
*/
#include <common.h>
#include <dm.h>
#include <fdt_support.h>
#include <asm/global_data.h>
#include <linux/libfdt.h>
#include <video.h>
DECLARE_GLOBAL_DATA_PTR;
static int fdt_simplefb_configure_node(void *blob, int off)
{
int xsize, ysize;
int bpix; /* log2 of bits per pixel */
const char *name;
ulong fb_base;
struct video_uc_plat *plat;
struct video_priv *uc_priv;
struct udevice *dev;
int ret;
ret = uclass_first_device_err(UCLASS_VIDEO, &dev);
if (ret)
return ret;
uc_priv = dev_get_uclass_priv(dev);
plat = dev_get_uclass_plat(dev);
xsize = uc_priv->xsize;
ysize = uc_priv->ysize;
bpix = uc_priv->bpix;
fb_base = plat->base;
switch (bpix) {
case 4: /* VIDEO_BPP16 */
name = "r5g6b5";
break;
case 5: /* VIDEO_BPP32 */
name = "a8r8g8b8";
break;
default:
return -EINVAL;
}
return fdt_setup_simplefb_node(blob, off, fb_base, xsize, ysize,
xsize * (1 << bpix) / 8, name);
}
int fdt_simplefb_add_node(void *blob)
{
static const char compat[] = "simple-framebuffer";
static const char disabled[] = "disabled";
int off, ret;
off = fdt_add_subnode(blob, 0, "framebuffer");
if (off < 0)
return -1;
ret = fdt_setprop(blob, off, "status", disabled, sizeof(disabled));
if (ret < 0)
return -1;
ret = fdt_setprop(blob, off, "compatible", compat, sizeof(compat));
if (ret < 0)
return -1;
return fdt_simplefb_configure_node(blob, off);
}
/**
* fdt_simplefb_enable_existing_node() - enable simple-framebuffer DT node
*
* @blob: device-tree
* Return: 0 on success, non-zero otherwise
*/
static int fdt_simplefb_enable_existing_node(void *blob)
{
int off;
off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
if (off < 0)
return -1;
return fdt_simplefb_configure_node(blob, off);
}
#if IS_ENABLED(CONFIG_VIDEO)
int fdt_simplefb_enable_and_mem_rsv(void *blob)
{
struct fdt_memory mem;
int ret;
/* nothing to do when video is not active */
if (!video_is_active())
return 0;
ret = fdt_simplefb_enable_existing_node(blob);
if (ret)
return ret;
/* nothing to do when the frame buffer is not defined */
if (gd->video_bottom == gd->video_top)
return 0;
/* reserved with no-map tag the video buffer */
mem.start = gd->video_bottom;
mem.end = gd->video_top - 1;
return fdtdec_add_reserved_memory(blob, "framebuffer", &mem, NULL, 0, NULL,
FDTDEC_RESERVED_MEMORY_NO_MAP);
}
#endif
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