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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright 2006 PathScale, Inc. All Rights Reserved. */ #ifndef _LINUX_IO_H #define _LINUX_IO_H #include <linux/types.h> #include <linux/init.h> #include <linux/bug.h> #include <linux/err.h> #include <asm/io.h> #include <asm/page.h> struct device; struct resource; __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); void __ioread32_copy(void *to, const void __iomem *from, size_t count); void __iowrite64_copy(void __iomem *to, const void *from, size_t count); #ifdef CONFIG_MMU int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot); #else static inline int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { return 0; } #endif #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP void __init ioremap_huge_init(void); int arch_ioremap_p4d_supported(void); int arch_ioremap_pud_supported(void); int arch_ioremap_pmd_supported(void); #else static inline void ioremap_huge_init(void) { } #endif /* * Managed iomap interface */ #ifdef CONFIG_HAS_IOPORT_MAP void __iomem * devm_ioport_map(struct device *dev, unsigned long port, unsigned int nr); void devm_ioport_unmap(struct device *dev, void __iomem *addr); #else static inline void __iomem *devm_ioport_map(struct device *dev, unsigned long port, unsigned int nr) { return NULL; } static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) { } #endif #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err) void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, resource_size_t size); void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, resource_size_t size); void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, resource_size_t size); void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, resource_size_t size); void devm_iounmap(struct device *dev, void __iomem *addr); int check_signature(const volatile void __iomem *io_addr, const unsigned char *signature, int length); void devm_ioremap_release(struct device *dev, void *res); void *devm_memremap(struct device *dev, resource_size_t offset, size_t size, unsigned long flags); void devm_memunmap(struct device *dev, void *addr); void *__devm_memremap_pages(struct device *dev, struct resource *res); #ifdef CONFIG_PCI /* * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and * Posting") mandate non-posted configuration transactions. There is * no ioremap API in the kernel that can guarantee non-posted write * semantics across arches so provide a default implementation for * mapping PCI config space that defaults to ioremap_nocache(); arches * should override it if they have memory mapping implementations that * guarantee non-posted writes semantics to make the memory mapping * compliant with the PCI specification. */ #ifndef pci_remap_cfgspace #define pci_remap_cfgspace pci_remap_cfgspace static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset, size_t size) { return ioremap_nocache(offset, size); } #endif #endif /* * Some systems do not have legacy ISA devices. * /dev/port is not a valid interface on these systems. * So for those archs, <asm/io.h> should define the following symbol. */ #ifndef arch_has_dev_port #define arch_has_dev_port() (1) #endif /* * Some systems (x86 without PAT) have a somewhat reliable way to mark a * physical address range such that uncached mappings will actually * end up write-combining. This facility should be used in conjunction * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has * no effect if the per-page mechanisms are functional. * (On x86 without PAT, these functions manipulate MTRRs.) * * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed * to have no effect. */ #ifndef arch_phys_wc_add static inline int __must_check arch_phys_wc_add(unsigned long base, unsigned long size) { return 0; /* It worked (i.e. did nothing). */ } static inline void arch_phys_wc_del(int handle) { } #define arch_phys_wc_add arch_phys_wc_add #ifndef arch_phys_wc_index static inline int arch_phys_wc_index(int handle) { return -1; } #define arch_phys_wc_index arch_phys_wc_index #endif #endif enum { /* See memremap() kernel-doc for usage description... */ MEMREMAP_WB = 1 << 0, MEMREMAP_WT = 1 << 1, MEMREMAP_WC = 1 << 2, MEMREMAP_ENC = 1 << 3, MEMREMAP_DEC = 1 << 4, }; void *memremap(resource_size_t offset, size_t size, unsigned long flags); void memunmap(void *addr); /* * On x86 PAT systems we have memory tracking that keeps track of * the allowed mappings on memory ranges. This tracking works for * all the in-kernel mapping APIs (ioremap*), but where the user * wishes to map a range from a physical device into user memory * the tracking won't be updated. This API is to be used by * drivers which remap physical device pages into userspace, * and wants to make sure they are mapped WC and not UC. */ #ifndef arch_io_reserve_memtype_wc static inline int arch_io_reserve_memtype_wc(resource_size_t base, resource_size_t size) { return 0; } static inline void arch_io_free_memtype_wc(resource_size_t base, resource_size_t size) { } #endif #endif /* _LINUX_IO_H */
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