include/linux/of_reserved_mem.h

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