include/linux/of_reserved_mem.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __OF_RESERVED_MEM_H
   3 #define __OF_RESERVED_MEM_H
   4
   5 #include <linux/device.h>
   6 #include <linux/of.h>
   7
   8 struct of_phandle_args;
   9 struct reserved_mem_ops;
  10
  11 struct reserved_mem {
  12         const char                      *name;
  13         unsigned long                   fdt_node;
  14         const struct reserved_mem_ops   *ops;
  15         phys_addr_t                     base;
  16         phys_addr_t                     size;
  17         void                            *priv;
  18 };
  19
  20 struct reserved_mem_ops {
  21         int     (*device_init)(struct reserved_mem *rmem,
  22                                struct device *dev);
  23         void    (*device_release)(struct reserved_mem *rmem,
  24                                   struct device *dev);
  25 };
  26
  27 typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
  28
  29 #ifdef CONFIG_OF_RESERVED_MEM
  30
  31 #define RESERVEDMEM_OF_DECLARE(name, compat, init)                      \
  32         _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
  33
  34 int of_reserved_mem_device_init_by_idx(struct device *dev,
  35                                        struct device_node *np, int idx);
  36 int of_reserved_mem_device_init_by_name(struct device *dev,
  37                                         struct device_node *np,
  38                                         const char *name);
  39 void of_reserved_mem_device_release(struct device *dev);
  40
  41 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
  42 #else
  43
  44 #define RESERVEDMEM_OF_DECLARE(name, compat, init)                      \
  45         _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
  46
  47 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
  48                                         struct device_node *np, int idx)
  49 {
  50         return -ENOSYS;
  51 }
  52
  53 static inline int of_reserved_mem_device_init_by_name(struct device *dev,
  54                                                       struct device_node *np,
  55                                                       const char *name)
  56 {
  57         return -ENOSYS;
  58 }
  59
  60 static inline void of_reserved_mem_device_release(struct device *pdev) { }
  61
  62 static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
  63 {
  64         return NULL;
  65 }
  66 #endif
  67
  68 /**
  69  * of_reserved_mem_device_init() - assign reserved memory region to given device
  70  * @dev:        Pointer to the device to configure
  71  *
  72  * This function assigns respective DMA-mapping operations based on the first
  73  * reserved memory region specified by 'memory-region' property in device tree
  74  * node of the given device.
  75  *
  76  * Returns error code or zero on success.
  77  */
  78 static inline int of_reserved_mem_device_init(struct device *dev)
  79 {
  80         return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
  81 }
  82
  83 #endif /* __OF_RESERVED_MEM_H */