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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
- void ioremap_phys_range_hook(phys_addr_t phys_addr, size_t size, pgprot_t prot);
- void iounmap_phys_range_hook(phys_addr_t phys_addr, size_t size);
- 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
- /*
- * 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_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);
- #ifdef CONFIG_PCI
- /*
- * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
- * Posting") mandate non-posted configuration transactions. This default
- * implementation attempts to use the ioremap_np() API to provide this
- * on arches that support it, and falls back to ioremap() on those that
- * don't. Overriding this function is deprecated; arches that properly
- * support non-posted accesses should implement ioremap_np() instead, which
- * this default implementation can then use to return mappings 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_np(offset, size) ?: ioremap(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
- int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
- 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
- int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
- resource_size_t size);
- #endif /* _LINUX_IO_H */
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