6a5e919876
In some cases drivers referencing a reserved-memory region might want to remap the entire region, but when defining the reserved-memory by "size" the client driver has no means to know the associated base address of the reserved memory region. This patch adds an accessor for such drivers to acquire a handle to their associated reserved-memory for this purpose. A complicating factor for the implementation is that the reserved_mem objects are created from the flattened DeviceTree, as such we can't use the device_node address for comparison. Fortunately the name of the node will be used as "name" of the reserved_mem and will be used when building the full_name, so we can compare the "name" with the basename of the full_name to find the match. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#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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struct of_phandle_args;
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struct reserved_mem_ops;
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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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unsigned long phandle;
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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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#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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#ifdef CONFIG_OF_RESERVED_MEM
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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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void of_reserved_mem_device_release(struct device *dev);
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int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
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phys_addr_t align,
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phys_addr_t start,
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phys_addr_t end,
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bool nomap,
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phys_addr_t *res_base);
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void fdt_init_reserved_mem(void);
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void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
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phys_addr_t base, phys_addr_t size);
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struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
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#else
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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 void of_reserved_mem_device_release(struct device *pdev) { }
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static inline void fdt_init_reserved_mem(void) { }
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static inline void fdt_reserved_mem_save_node(unsigned long node,
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const char *uname, phys_addr_t base, phys_addr_t size) { }
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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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#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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