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