Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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> |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 6 | #include <linux/of.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | unsigned long phandle; |
| 15 | const struct reserved_mem_ops *ops; |
| 16 | phys_addr_t base; |
| 17 | phys_addr_t size; |
| 18 | void *priv; |
| 19 | }; |
| 20 | |
| 21 | struct reserved_mem_ops { |
| 22 | int (*device_init)(struct reserved_mem *rmem, |
| 23 | struct device *dev); |
| 24 | void (*device_release)(struct reserved_mem *rmem, |
| 25 | struct device *dev); |
| 26 | }; |
| 27 | |
| 28 | typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem); |
| 29 | |
| 30 | #define RESERVEDMEM_OF_DECLARE(name, compat, init) \ |
| 31 | _OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn) |
| 32 | |
| 33 | #ifdef CONFIG_OF_RESERVED_MEM |
| 34 | |
| 35 | int of_reserved_mem_device_init_by_idx(struct device *dev, |
| 36 | struct device_node *np, int idx); |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 37 | int of_reserved_mem_device_init_by_name(struct device *dev, |
| 38 | struct device_node *np, |
| 39 | const char *name); |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 40 | void of_reserved_mem_device_release(struct device *dev); |
| 41 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 42 | void fdt_init_reserved_mem(void); |
| 43 | void fdt_reserved_mem_save_node(unsigned long node, const char *uname, |
| 44 | phys_addr_t base, phys_addr_t size); |
| 45 | struct reserved_mem *of_reserved_mem_lookup(struct device_node *np); |
| 46 | #else |
| 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 | } |
Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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 | |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 60 | static inline void of_reserved_mem_device_release(struct device *pdev) { } |
| 61 | |
| 62 | static inline void fdt_init_reserved_mem(void) { } |
| 63 | static inline void fdt_reserved_mem_save_node(unsigned long node, |
| 64 | const char *uname, phys_addr_t base, phys_addr_t size) { } |
| 65 | static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np) |
| 66 | { |
| 67 | return NULL; |
| 68 | } |
| 69 | #endif |
| 70 | |
| 71 | /** |
| 72 | * of_reserved_mem_device_init() - assign reserved memory region to given device |
| 73 | * @dev: Pointer to the device to configure |
| 74 | * |
| 75 | * This function assigns respective DMA-mapping operations based on the first |
| 76 | * reserved memory region specified by 'memory-region' property in device tree |
| 77 | * node of the given device. |
| 78 | * |
| 79 | * Returns error code or zero on success. |
| 80 | */ |
| 81 | static inline int of_reserved_mem_device_init(struct device *dev) |
| 82 | { |
| 83 | return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0); |
| 84 | } |
| 85 | |
| 86 | #endif /* __OF_RESERVED_MEM_H */ |