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

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2012 Stephen Warren
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <video.h>
+#include <asm/arch/mbox.h>
+#include <asm/arch/msg.h>
+
+static int bcm2835_video_probe(struct udevice *dev)
+{
+	struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
+	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
+	int ret;
+	int w, h, pitch;
+	ulong fb_base, fb_size, fb_start, fb_end;
+
+	debug("bcm2835: Query resolution...\n");
+	ret = bcm2835_get_video_size(&w, &h);
+	if (ret || w == 0 || h == 0)
+		return -EIO;
+
+	debug("bcm2835: Setting up display for %d x %d\n", w, h);
+	ret = bcm2835_set_video_params(&w, &h, 32, BCM2835_MBOX_PIXEL_ORDER_RGB,
+				       BCM2835_MBOX_ALPHA_MODE_IGNORED,
+				       &fb_base, &fb_size, &pitch);
+	if (ret)
+		return -EIO;
+
+	debug("bcm2835: Final resolution is %d x %d\n", w, h);
+
+	/* Enable dcache for the frame buffer */
+	fb_start = fb_base & ~(MMU_SECTION_SIZE - 1);
+	fb_end = fb_base + fb_size;
+	fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
+	mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
+					DCACHE_WRITEBACK);
+	video_set_flush_dcache(dev, true);
+
+	uc_priv->xsize = w;
+	uc_priv->ysize = h;
+	uc_priv->bpix = VIDEO_BPP32;
+	plat->base = fb_base;
+	plat->size = fb_size;
+
+	return 0;
+}
+
+static const struct udevice_id bcm2835_video_ids[] = {
+	{ .compatible = "brcm,bcm2835-hdmi" },
+	{ .compatible = "brcm,bcm2708-fb" },
+	{ }
+};
+
+U_BOOT_DRIVER(bcm2835_video) = {
+	.name	= "bcm2835_video",
+	.id	= UCLASS_VIDEO,
+	.of_match = bcm2835_video_ids,
+	.probe	= bcm2835_video_probe,
+};