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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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Drivers with "memory-region" properties currently have to do their own parsing of "memory-region" properties. The result is all the drivers have similar patterns of a call to parse "memory-region" and then get the region's address and size. As this is a standard property, it should have common functions for drivers to use. Add new functions to count the number of regions and retrieve the region's address as a resource. Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com> Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com> Link: https://lore.kernel.org/r/20250423-dt-memory-region-v2-v2-1-2fbd6ebd3c88@kernel.org Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __OF_RESERVED_MEM_H
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#define __OF_RESERVED_MEM_H
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#include <linux/device.h>
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#include <linux/of.h>
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struct of_phandle_args;
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struct reserved_mem_ops;
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struct resource;
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struct reserved_mem {
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const char *name;
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unsigned long fdt_node;
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const struct reserved_mem_ops *ops;
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phys_addr_t base;
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phys_addr_t size;
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void *priv;
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};
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struct reserved_mem_ops {
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int (*device_init)(struct reserved_mem *rmem,
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struct device *dev);
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void (*device_release)(struct reserved_mem *rmem,
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struct device *dev);
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};
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typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem);
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#ifdef CONFIG_OF_RESERVED_MEM
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#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
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_OF_DECLARE(reservedmem, name, compat, init, reservedmem_of_init_fn)
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int of_reserved_mem_device_init_by_idx(struct device *dev,
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struct device_node *np, int idx);
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int of_reserved_mem_device_init_by_name(struct device *dev,
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struct device_node *np,
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const char *name);
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void of_reserved_mem_device_release(struct device *dev);
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struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
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int of_reserved_mem_region_to_resource(const struct device_node *np,
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unsigned int idx, struct resource *res);
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int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
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const char *name, struct resource *res);
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int of_reserved_mem_region_count(const struct device_node *np);
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#else
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#define RESERVEDMEM_OF_DECLARE(name, compat, init) \
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_OF_DECLARE_STUB(reservedmem, name, compat, init, reservedmem_of_init_fn)
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static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
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struct device_node *np, int idx)
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{
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return -ENOSYS;
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}
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static inline int of_reserved_mem_device_init_by_name(struct device *dev,
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struct device_node *np,
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const char *name)
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{
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return -ENOSYS;
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}
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static inline void of_reserved_mem_device_release(struct device *pdev) { }
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static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
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{
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return NULL;
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}
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static inline int of_reserved_mem_region_to_resource(const struct device_node *np,
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unsigned int idx,
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struct resource *res)
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{
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return -ENOSYS;
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}
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static inline int of_reserved_mem_region_to_resource_byname(const struct device_node *np,
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const char *name,
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struct resource *res)
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{
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return -ENOSYS;
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}
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static inline int of_reserved_mem_region_count(const struct device_node *np)
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{
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return 0;
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}
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#endif
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/**
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* of_reserved_mem_device_init() - assign reserved memory region to given device
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* @dev: Pointer to the device to configure
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*
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* This function assigns respective DMA-mapping operations based on the first
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* reserved memory region specified by 'memory-region' property in device tree
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* node of the given device.
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*
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* Returns error code or zero on success.
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*/
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static inline int of_reserved_mem_device_init(struct device *dev)
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{
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return of_reserved_mem_device_init_by_idx(dev, dev->of_node, 0);
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}
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#endif /* __OF_RESERVED_MEM_H */
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