of_reserved_mem.h 2.4 KB

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