| 1 |
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| 2 | |
| 3 | * Copyright 2006 PathScale, Inc. All Rights Reserved.
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| 4 |
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| 5 |
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| 6 | #ifndef _LINUX_IO_H
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| 7 | #define _LINUX_IO_H
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| 8 |
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| 9 | #include <linux/sizes.h>
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| 10 | #include <linux/types.h>
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| 11 | #include <linux/init.h>
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| 12 | #include <asm/io.h>
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| 13 | #include <asm/page.h>
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| 14 |
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| 15 | struct device;
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| 16 |
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| 17 | #ifndef __iowrite32_copy
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| 18 | void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
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| 19 | #endif
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| 20 |
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| 21 | void __ioread32_copy(void *to, const void __iomem *from, size_t count);
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| 22 |
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| 23 | #ifndef __iowrite64_copy
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| 24 | void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
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| 25 | #endif
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| 26 |
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| 27 | #ifdef CONFIG_MMU
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| 28 | int ioremap_page_range(unsigned long addr, unsigned long end,
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| 29 | phys_addr_t phys_addr, pgprot_t prot);
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| 30 | int vmap_page_range(unsigned long addr, unsigned long end,
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| 31 | phys_addr_t phys_addr, pgprot_t prot);
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| 32 | #else
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| 33 | static inline int ioremap_page_range(unsigned long addr, unsigned long end,
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| 34 | phys_addr_t phys_addr, pgprot_t prot)
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| 35 | {
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| 36 | return 0;
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| 37 | }
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| 38 | static inline int vmap_page_range(unsigned long addr, unsigned long end,
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| 39 | phys_addr_t phys_addr, pgprot_t prot)
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| 40 | {
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| 41 | return 0;
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| 42 | }
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| 43 | #endif
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| 44 |
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| 45 | |
| 46 | * Managed iomap interface
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| 47 |
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| 48 | #ifdef CONFIG_HAS_IOPORT_MAP
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| 49 | void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
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| 50 | unsigned int nr);
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| 51 | void devm_ioport_unmap(struct device *dev, void __iomem *addr);
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| 52 | #else
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| 53 | static inline void __iomem *devm_ioport_map(struct device *dev,
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| 54 | unsigned long port,
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| 55 | unsigned int nr)
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| 56 | {
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| 57 | return NULL;
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| 58 | }
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| 59 |
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| 60 | static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
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| 61 | {
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| 62 | }
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| 63 | #endif
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| 64 |
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| 65 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
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| 66 | resource_size_t size);
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| 67 | void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
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| 68 | resource_size_t size);
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| 69 | void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
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| 70 | resource_size_t size);
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| 71 | void devm_iounmap(struct device *dev, void __iomem *addr);
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| 72 | int check_signature(const volatile void __iomem *io_addr,
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| 73 | const unsigned char *signature, int length);
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| 74 | void devm_ioremap_release(struct device *dev, void *res);
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| 75 |
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| 76 | void *devm_memremap(struct device *dev, resource_size_t offset,
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| 77 | size_t size, unsigned long flags);
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| 78 | void devm_memunmap(struct device *dev, void *addr);
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| 79 |
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| 80 |
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| 81 | pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
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| 82 | unsigned long size, pgprot_t prot);
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| 83 |
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| 84 |
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| 85 | #ifdef CONFIG_PCI
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| 86 | |
| 87 | * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
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| 88 | * Posting") mandate non-posted configuration transactions. This default
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| 89 | * implementation attempts to use the ioremap_np() API to provide this
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| 90 | * on arches that support it, and falls back to ioremap() on those that
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| 91 | * don't. Overriding this function is deprecated; arches that properly
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| 92 | * support non-posted accesses should implement ioremap_np() instead, which
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| 93 | * this default implementation can then use to return mappings compliant with
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| 94 | * the PCI specification.
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| 95 |
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| 96 | #ifndef pci_remap_cfgspace
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| 97 | #define pci_remap_cfgspace pci_remap_cfgspace
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| 98 | static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
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| 99 | size_t size)
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| 100 | {
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| 101 | return ioremap_np(offset, size) ?: ioremap(offset, size);
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| 102 | }
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| 103 | #endif
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| 104 | #endif
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| 105 |
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| 106 | |
| 107 | * Some systems do not have legacy ISA devices.
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| 108 | * /dev/port is not a valid interface on these systems.
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| 109 | * So for those archs, <asm/io.h> should define the following symbol.
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| 110 |
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| 111 | #ifndef arch_has_dev_port
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| 112 | #define arch_has_dev_port() (1)
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| 113 | #endif
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| 114 |
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| 115 | |
| 116 | * Some systems (x86 without PAT) have a somewhat reliable way to mark a
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| 117 | * physical address range such that uncached mappings will actually
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| 118 | * end up write-combining. This facility should be used in conjunction
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| 119 | * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
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| 120 | * no effect if the per-page mechanisms are functional.
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| 121 | * (On x86 without PAT, these functions manipulate MTRRs.)
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| 122 | *
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| 123 | * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
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| 124 | * to have no effect.
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| 125 |
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| 126 | #ifndef arch_phys_wc_add
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| 127 | static inline int __must_check arch_phys_wc_add(unsigned long base,
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| 128 | unsigned long size)
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| 129 | {
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| 130 | return 0;
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| 131 | }
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| 132 |
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| 133 | static inline void arch_phys_wc_del(int handle)
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| 134 | {
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| 135 | }
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| 136 |
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| 137 | #define arch_phys_wc_add arch_phys_wc_add
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| 138 | #ifndef arch_phys_wc_index
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| 139 | static inline int arch_phys_wc_index(int handle)
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| 140 | {
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| 141 | return -1;
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| 142 | }
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| 143 | #define arch_phys_wc_index arch_phys_wc_index
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| 144 | #endif
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| 145 | #endif
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| 146 |
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| 147 | int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
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| 148 |
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| 149 | enum {
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| 150 |
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| 151 | MEMREMAP_WB = 1 << 0,
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| 152 | MEMREMAP_WT = 1 << 1,
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| 153 | MEMREMAP_WC = 1 << 2,
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| 154 | MEMREMAP_ENC = 1 << 3,
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| 155 | MEMREMAP_DEC = 1 << 4,
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| 156 | };
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| 157 |
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| 158 | void *memremap(resource_size_t offset, size_t size, unsigned long flags);
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| 159 | void memunmap(void *addr);
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| 160 |
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| 161 | |
| 162 | * On x86 PAT systems we have memory tracking that keeps track of
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| 163 | * the allowed mappings on memory ranges. This tracking works for
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| 164 | * all the in-kernel mapping APIs (ioremap*), but where the user
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| 165 | * wishes to map a range from a physical device into user memory
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| 166 | * the tracking won't be updated. This API is to be used by
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| 167 | * drivers which remap physical device pages into userspace,
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| 168 | * and wants to make sure they are mapped WC and not UC.
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| 169 |
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| 170 | #ifndef arch_io_reserve_memtype_wc
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| 171 | static inline int arch_io_reserve_memtype_wc(resource_size_t base,
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| 172 | resource_size_t size)
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| 173 | {
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| 174 | return 0;
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| 175 | }
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| 176 |
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| 177 | static inline void arch_io_free_memtype_wc(resource_size_t base,
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| 178 | resource_size_t size)
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| 179 | {
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| 180 | }
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| 181 | #endif
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| 182 |
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| 183 | int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
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| 184 | resource_size_t size);
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| 185 |
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| 186 | #ifdef CONFIG_STRICT_DEVMEM
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| 187 | static inline int range_is_allowed(unsigned long pfn, unsigned long size)
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| 188 | {
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| 189 | u64 from = ((u64)pfn) << PAGE_SHIFT;
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| 190 | u64 to = from + size;
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| 191 | u64 cursor = from;
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| 192 |
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| 193 | while (cursor < to) {
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| 194 | if (!devmem_is_allowed(pfn))
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| 195 | return 0;
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| 196 | cursor += PAGE_SIZE;
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| 197 | pfn++;
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| 198 | }
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| 199 | return 1;
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| 200 | }
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| 201 | #else
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| 202 | static inline int range_is_allowed(unsigned long pfn, unsigned long size)
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| 203 | {
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| 204 | return 1;
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| 205 | }
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| 206 | #endif
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| 207 | #endif
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