| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef __OF_RESERVED_MEM_H |
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| 3 | #define __OF_RESERVED_MEM_H |
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| 4 | |
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| 5 | #include <linux/device.h> |
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| 6 | #include <linux/of.h> |
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| 7 | |
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| 8 | struct of_phandle_args; |
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| 9 | struct reserved_mem_ops; |
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| 10 | |
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| 11 | struct reserved_mem { |
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| 12 | const char *name; |
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| 13 | unsigned long fdt_node; |
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| 14 | unsigned long phandle; |
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| 15 | const struct reserved_mem_ops *ops; |
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| 16 | phys_addr_t base; |
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| 17 | phys_addr_t size; |
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| 18 | void *priv; |
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| 19 | }; |
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| 20 | |
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| 21 | struct reserved_mem_ops { |
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| 22 | int (*device_init)(struct reserved_mem *rmem, |
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| 23 | struct device *dev); |
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| 24 | void (*device_release)(struct reserved_mem *rmem, |
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| 25 | struct device *dev); |
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| 26 | }; |
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| 27 | |
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| 28 | typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); |
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| 29 | |
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| 30 | #ifdef CONFIG_OF_RESERVED_MEM |
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| 31 | |
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| 32 | #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ |
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| 33 | _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) |
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| 34 | |
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| 35 | int of_reserved_mem_device_init_by_idx(struct device *dev, |
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| 36 | struct device_node *np, int idx); |
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| 37 | int of_reserved_mem_device_init_by_name(struct device *dev, |
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| 38 | struct device_node *np, |
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| 39 | const char *name); |
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| 40 | void of_reserved_mem_device_release(struct device *dev); |
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| 41 | |
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| 42 | struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); |
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| 43 | #else |
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| 44 | |
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| 45 | #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ |
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| 46 | _OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn) |
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| 47 | |
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| 48 | static inline int of_reserved_mem_device_init_by_idx(struct device *dev, |
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| 49 | struct device_node *np, int idx) |
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| 50 | { |
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| 51 | return -ENOSYS; |
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| 52 | } |
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| 53 | |
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| 54 | static inline int of_reserved_mem_device_init_by_name(struct device *dev, |
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| 55 | struct device_node *np, |
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| 56 | const char *name) |
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| 57 | { |
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| 58 | return -ENOSYS; |
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| 59 | } |
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| 60 | |
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| 61 | static inline void of_reserved_mem_device_release(struct device *pdev) { } |
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| 62 | |
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| 63 | static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) |
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| 64 | { |
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| 65 | return NULL; |
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| 66 | } |
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| 67 | #endif |
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| 68 | |
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| 69 | /** |
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| 70 | * of_reserved_mem_device_init() - assign reserved memory region to given device |
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| 71 | * @dev: Pointer to the device to configure |
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| 72 | * |
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| 73 | * This function assigns respective DMA-mapping operations based on the first |
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| 74 | * reserved memory region specified by 'memory-region' property in device tree |
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| 75 | * node of the given device. |
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| 76 | * |
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| 77 | * Returns error code or zero on success. |
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| 78 | */ |
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| 79 | static inline int of_reserved_mem_device_init(struct device *dev) |
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| 80 | { |
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| 81 | return of_reserved_mem_device_init_by_idx(dev, np: dev->of_node, idx: 0); |
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| 82 | } |
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| 83 | |
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| 84 | #endif /* __OF_RESERVED_MEM_H */ |
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| 85 | |
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