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

source/bootloader/u-boot-2020.01/drivers/axi/axi_sandbox.c

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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2018
+ * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
+ */
+
+#include <common.h>
+#include <axi.h>
+#include <dm.h>
+#include <asm/axi.h>
+
+/*
+ * This driver implements a AXI bus for the sandbox architecture for testing
+ * purposes.
+ *
+ * The bus forwards every access to it to a special AXI emulation device (which
+ * it gets via the axi_emul_get_ops function) that implements a simple
+ * read/write storage.
+ *
+ * The emulator device must still be contained in the device tree in the usual
+ * way, since configuration data for the storage is read from the DT.
+ */
+
+static int axi_sandbox_read(struct udevice *bus, ulong address, void *data,
+			    enum axi_size_t size)
+{
+	struct axi_emul_ops *ops;
+	struct udevice *emul;
+	int ret;
+
+	/* Get emulator device */
+	ret = axi_sandbox_get_emul(bus, address, size, &emul);
+	if (ret)
+		return ret == -ENODEV ? 0 : ret;
+	/* Forward all reads to the AXI emulator */
+	ops = axi_emul_get_ops(emul);
+	if (!ops || !ops->read)
+		return -ENOSYS;
+
+	return ops->read(emul, address, data, size);
+}
+
+static int axi_sandbox_write(struct udevice *bus, ulong address, void *data,
+			     enum axi_size_t size)
+{
+	struct axi_emul_ops *ops;
+	struct udevice *emul;
+	int ret;
+
+	/* Get emulator device */
+	ret = axi_sandbox_get_emul(bus, address, size, &emul);
+	if (ret)
+		return ret == -ENODEV ? 0 : ret;
+	/* Forward all writes to the AXI emulator */
+	ops = axi_emul_get_ops(emul);
+	if (!ops || !ops->write)
+		return -ENOSYS;
+
+	return ops->write(emul, address, data, size);
+}
+
+static const struct udevice_id axi_sandbox_ids[] = {
+	{ .compatible = "sandbox,axi" },
+	{ /* sentinel */ }
+};
+
+static const struct axi_ops axi_sandbox_ops = {
+	.read = axi_sandbox_read,
+	.write = axi_sandbox_write,
+};
+
+U_BOOT_DRIVER(axi_sandbox_bus) = {
+	.name           = "axi_sandbox_bus",
+	.id             = UCLASS_AXI,
+	.of_match       = axi_sandbox_ids,
+	.ops		= &axi_sandbox_ops,
+};