| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Generic I/O functions. |
| * |
| * Copyright (c) 2016 Imagination Technologies Ltd. |
| */ |
| |
| #ifndef __ASM_GENERIC_IO_H__ |
| #define __ASM_GENERIC_IO_H__ |
| |
| /* |
| * This file should be included at the end of each architecture-specific |
| * asm/io.h such that we may provide generic implementations without |
| * conflicting with architecture-specific code. |
| */ |
| |
| #ifndef __ASSEMBLY__ |
| |
| /** |
| * phys_to_virt() - Return a virtual address mapped to a given physical address |
| * @paddr: the physical address |
| * |
| * Returns a virtual address which the CPU can access that maps to the physical |
| * address @paddr. This should only be used where it is known that no dynamic |
| * mapping is required. In general, map_physmem should be used instead. |
| * |
| * Returns: a virtual address which maps to @paddr |
| */ |
| #ifndef phys_to_virt |
| static inline void *phys_to_virt(phys_addr_t paddr) |
| { |
| return (void *)(unsigned long)paddr; |
| } |
| #endif |
| |
| /** |
| * virt_to_phys() - Return the physical address that a virtual address maps to |
| * @vaddr: the virtual address |
| * |
| * Returns the physical address which the CPU-accessible virtual address @vaddr |
| * maps to. |
| * |
| * Returns: the physical address which @vaddr maps to |
| */ |
| #ifndef virt_to_phys |
| static inline phys_addr_t virt_to_phys(void *vaddr) |
| { |
| return (phys_addr_t)((unsigned long)vaddr); |
| } |
| #endif |
| |
| /* |
| * Flags for use with map_physmem() & unmap_physmem(). Architectures need not |
| * support all of these, in which case they will be defined as zero here & |
| * ignored. Callers that may run on multiple architectures should therefore |
| * treat them as hints rather than requirements. |
| */ |
| #ifndef MAP_NOCACHE |
| # define MAP_NOCACHE 0 /* Produce an uncached mapping */ |
| #endif |
| #ifndef MAP_WRCOMBINE |
| # define MAP_WRCOMBINE 0 /* Allow write-combining on the mapping */ |
| #endif |
| #ifndef MAP_WRBACK |
| # define MAP_WRBACK 0 /* Map using write-back caching */ |
| #endif |
| #ifndef MAP_WRTHROUGH |
| # define MAP_WRTHROUGH 0 /* Map using write-through caching */ |
| #endif |
| |
| /** |
| * map_physmem() - Return a virtual address mapped to a given physical address |
| * @paddr: the physical address |
| * @len: the length of the required mapping |
| * @flags: flags affecting the type of mapping |
| * |
| * Return a virtual address through which the CPU may access the memory at |
| * physical address @paddr. The mapping will be valid for at least @len bytes, |
| * and may be affected by flags passed to the @flags argument. This function |
| * may create new mappings, so should generally be paired with a matching call |
| * to unmap_physmem once the caller is finished with the memory in question. |
| * |
| * Returns: a virtual address suitably mapped to @paddr |
| */ |
| #ifndef map_physmem |
| static inline void *map_physmem(phys_addr_t paddr, unsigned long len, |
| unsigned long flags) |
| { |
| return phys_to_virt(paddr); |
| } |
| #endif |
| |
| /** |
| * unmap_physmem() - Remove mappings created by a prior call to map_physmem() |
| * @vaddr: the virtual address which map_physmem() previously returned |
| * @flags: flags matching those originally passed to map_physmem() |
| * |
| * Unmap memory which was previously mapped by a call to map_physmem(). If |
| * map_physmem() dynamically created a mapping for the memory in question then |
| * unmap_physmem() will remove that mapping. |
| */ |
| #ifndef unmap_physmem |
| static inline void unmap_physmem(void *vaddr, unsigned long flags) |
| { |
| } |
| #endif |
| |
| #ifndef ioread32_rep |
| #define ioread32_rep ioread32_rep |
| static inline void ioread32_rep(const volatile void __iomem *addr, |
| void *buffer, unsigned int count) |
| { |
| readsl(addr, buffer, count); |
| } |
| #endif |
| |
| #ifndef iowrite32_rep |
| #define iowrite32_rep iowrite32_rep |
| static inline void iowrite32_rep(volatile void __iomem *addr, |
| const void *buffer, |
| unsigned int count) |
| { |
| writesl(addr, buffer, count); |
| } |
| #endif |
| |
| #endif /* !__ASSEMBLY__ */ |
| #endif /* __ASM_GENERIC_IO_H__ */ |