include/soc/qcom/ocmem.h

   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__ */