1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677 |
- // 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,
- };
|