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https://github.com/AsahiLinux/u-boot
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67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* (C) Copyright 2018
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* Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
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*/
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#ifndef __asm_axi_h
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#define __asm_axi_h
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#define axi_emul_get_ops(dev) ((struct axi_emul_ops *)(dev)->driver->ops)
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/**
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* axi_sandbox_get_emul() - Retrieve a pointer to a AXI emulation device
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* @bus: The AXI bus from which to retrieve a emulation device
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* @address: The address of a transfer that should be handled by a emulation
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* device
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* @length: The data width of a transfer that should be handled by a emulation
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* device
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* @emulp: Pointer to a buffer receiving the emulation device that handles
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* the transfer specified by the address and length parameters
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*
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* To test the AXI uclass, we implement a simple AXI emulation device, which is
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* a virtual device on a AXI bus that exposes a simple storage interface: When
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* reading and writing from the device, the addresses are translated to offsets
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* within the device's storage. For write accesses the data is written to the
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* specified storage offset, and for read accesses the data is read from the
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* specified storage offset.
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*
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* A DTS entry might look like this:
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*
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* axi: axi@0 {
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* compatible = "sandbox,axi";
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* #address-cells = <0x1>;
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* #size-cells = <0x1>;
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* store@0 {
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* compatible = "sandbox,sandbox_store";
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* reg = <0x0 0x400>;
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* };
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* };
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*
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* This function may then be used to retrieve the pointer to the sandbox_store
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* emulation device given the AXI bus device, and the data (address, data
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* width) of a AXI transfer which should be handled by a emulation device.
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*
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* Return: 0 of OK, -ENODEV if no device capable of handling the specified
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* transfer exists or the device could not be retrieved
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*/
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int axi_sandbox_get_emul(struct udevice *bus, ulong address, uint length,
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struct udevice **emulp);
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/**
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* axi_get_store() - Get address of internal storage of a emulated AXI device
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* @dev: Emulated AXI device to get the pointer of the internal storage
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* for.
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* @storep: Pointer to the internal storage of the emulated AXI device.
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*
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* To preset or read back the contents internal storage of the emulated AXI
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* device, this function returns the pointer to the storage. Changes to the
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* contents of the storage are reflected when using the AXI read/write API
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* methods, and vice versa, so by using this method expected read data can be
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* set up in advance, and written data can be checked in unit tests.
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*
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* Return: 0 if OK, -ve on error.
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*/
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int axi_get_store(struct udevice *dev, u8 **storep);
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#endif /* __asm_axi_h */
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