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
18 enum 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
28 struct ocmem;
29
30 struct ocmem_buf {
31 unsigned long offset;
32 unsigned long addr;
33 unsigned long len;
34 };
35
36 #if IS_ENABLED(CONFIG_QCOM_OCMEM)
37
38 struct ocmem *of_get_ocmem(struct device *dev);
39 struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem, enum ocmem_client client,
40 unsigned long size);
41 void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
42 struct ocmem_buf *buf);
43
44 #else /* IS_ENABLED(CONFIG_QCOM_OCMEM) */
45
46 static inline struct ocmem *of_get_ocmem(struct device *dev)
47 {
48 return ERR_PTR(-ENODEV);
49 }
50
51 static 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
58 static 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__ */
66
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.