1 files changed, 116 insertions, 0 deletions
diff --git a/boot/fdt_simplefb.c b/boot/fdt_simplefb.c
new file mode 100644
index 0000000000..069ced75a7
--- /dev/null
+++ b/boot/fdt_simplefb.c
@@ -0,0 +1,116 @@
+// 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