1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * The On Chip Memory (OCMEM) allocator allows various clients to allocate
 4 * memory from OCMEM based on performance, latency and power requirements.
 5 * This is typically used by the GPU, camera/video, and audio components on
 6 * some Snapdragon SoCs.
 7 *
 8 * Copyright (C) 2019 Brian Masney <masneyb@onstation.org>
 9 * Copyright (C) 2015 Red Hat. Author: Rob Clark <robdclark@gmail.com>
10 */
11
12#include <linux/device.h>
13#include <linux/err.h>
14
15#ifndef __OCMEM_H__
16#define __OCMEM_H__
17
18enum ocmem_client {
19	/* GMEM clients */
20	OCMEM_GRAPHICS = 0x0,
21	/*
22	 * TODO add more once ocmem_allocate() is clever enough to
23	 * deal with multiple clients.
24	 */
25	OCMEM_CLIENT_MAX,
26};
27
28struct ocmem;
29
30struct ocmem_buf {
31	unsigned long offset;
32	unsigned long addr;
33	unsigned long len;
34};
35
36#if IS_ENABLED(CONFIG_QCOM_OCMEM)
37
38struct ocmem *of_get_ocmem(struct device *dev);
39struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem, enum ocmem_client client,
40				 unsigned long size);
41void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
42		struct ocmem_buf *buf);
43
44#else /* IS_ENABLED(CONFIG_QCOM_OCMEM) */
45
46static inline struct ocmem *of_get_ocmem(struct device *dev)
47{
48	return ERR_PTR(-ENODEV);
49}
50
51static inline struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem,
52					       enum ocmem_client client,
53					       unsigned long size)
54{
55	return ERR_PTR(-ENODEV);
56}
57
58static inline void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
59			      struct ocmem_buf *buf)
60{
61}
62
63#endif /* IS_ENABLED(CONFIG_QCOM_OCMEM) */
64
65#endif /* __OCMEM_H__ */