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

source/bootloader/u-boot-2020.01/drivers/reset/reset-bcm6345.c

@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/arch/mips/bcm63xx/reset.c:
+ *	Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset-uclass.h>
+#include <asm/io.h>
+
+#define MAX_RESETS	32
+
+struct bcm6345_reset_priv {
+	void __iomem *regs;
+};
+
+static int bcm6345_reset_assert(struct reset_ctl *rst)
+{
+	struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
+
+	clrbits_be32(priv->regs, BIT(rst->id));
+	mdelay(20);
+
+	return 0;
+}
+
+static int bcm6345_reset_deassert(struct reset_ctl *rst)
+{
+	struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
+
+	setbits_be32(priv->regs, BIT(rst->id));
+	mdelay(20);
+
+	return 0;
+}
+
+static int bcm6345_reset_free(struct reset_ctl *rst)
+{
+	return 0;
+}
+
+static int bcm6345_reset_request(struct reset_ctl *rst)
+{
+	if (rst->id >= MAX_RESETS)
+		return -EINVAL;
+
+	return bcm6345_reset_assert(rst);
+}
+
+struct reset_ops bcm6345_reset_reset_ops = {
+	.free = bcm6345_reset_free,
+	.request = bcm6345_reset_request,
+	.rst_assert = bcm6345_reset_assert,
+	.rst_deassert = bcm6345_reset_deassert,
+};
+
+static const struct udevice_id bcm6345_reset_ids[] = {
+	{ .compatible = "brcm,bcm6345-reset" },
+	{ /* sentinel */ }
+};
+
+static int bcm6345_reset_probe(struct udevice *dev)
+{
+	struct bcm6345_reset_priv *priv = dev_get_priv(dev);
+
+	priv->regs = dev_remap_addr(dev);
+	if (!priv->regs)
+		return -EINVAL;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(bcm6345_reset) = {
+	.name = "bcm6345-reset",
+	.id = UCLASS_RESET,
+	.of_match = bcm6345_reset_ids,
+	.ops = &bcm6345_reset_reset_ops,
+	.probe = bcm6345_reset_probe,
+	.priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
+};