GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/common/lcd_simplefb.c

@@ -0,0 +1,90 @@
+// 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 <lcd.h>
+#include <fdt_support.h>
+#include <linux/libfdt.h>
+#include <video.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int lcd_dt_simplefb_configure_node(void *blob, int off)
+{
+	int xsize, ysize;
+	int bpix; /* log2 of bits per pixel */
+	const char *name;
+	ulong fb_base;
+#ifdef CONFIG_DM_VIDEO
+	struct video_uc_platdata *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_platdata(dev);
+	xsize = uc_priv->xsize;
+	ysize = uc_priv->ysize;
+	bpix = uc_priv->bpix;
+	fb_base = plat->base;
+#else
+	xsize = lcd_get_pixel_width();
+	ysize = lcd_get_pixel_height();
+	bpix = LCD_BPP;
+	fb_base = gd->fb_base;
+#endif
+	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 lcd_dt_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 lcd_dt_simplefb_configure_node(blob, off);
+}
+
+int lcd_dt_simplefb_enable_existing_node(void *blob)
+{
+	int off;
+
+	off = fdt_node_offset_by_compatible(blob, -1, "simple-framebuffer");
+	if (off < 0)
+		return -1;
+
+	return lcd_dt_simplefb_configure_node(blob, off);
+}