| 1 | |
| 2 | * Copyright 2006 PathScale, Inc. All Rights Reserved.
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| 3 | *
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| 4 | * This file is free software; you can redistribute it and/or modify
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| 5 | * it under the terms of version 2 of the GNU General Public License
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| 6 | * as published by the Free Software Foundation.
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| 7 | *
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| 8 | * This program is distributed in the hope that it will be useful,
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| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 11 | * GNU General Public License for more details.
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| 12 | *
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| 13 | * You should have received a copy of the GNU General Public License
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| 14 | * along with this program; if not, write to the Free Software Foundation,
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| 15 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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| 16 |
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| 17 |
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| 18 | #ifndef _LINUX_IO_H
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| 19 | #define _LINUX_IO_H
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| 20 |
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| 21 | #include <linux/types.h>
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| 22 | #include <asm/io.h>
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| 23 | #include <asm/page.h>
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| 24 |
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| 25 | struct device;
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| 26 |
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| 27 | __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
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| 28 | void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
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| 29 |
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| 30 | #ifdef CONFIG_MMU
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| 31 | int ioremap_page_range(unsigned long addr, unsigned long end,
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| 32 | phys_addr_t phys_addr, pgprot_t prot);
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| 33 | #else
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| 34 | static inline int ioremap_page_range(unsigned long addr, unsigned long end,
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| 35 | phys_addr_t phys_addr, pgprot_t prot)
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| 36 | {
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| 37 | return 0;
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| 38 | }
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| 39 | #endif
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| 40 |
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| 41 | |
| 42 | * Managed iomap interface
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| 43 |
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| 44 | #ifdef CONFIG_HAS_IOPORT_MAP
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| 45 | void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
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| 46 | unsigned int nr);
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| 47 | void devm_ioport_unmap(struct device *dev, void __iomem *addr);
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| 48 | #else
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| 49 | static inline void __iomem *devm_ioport_map(struct device *dev,
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| 50 | unsigned long port,
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| 51 | unsigned int nr)
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| 52 | {
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| 53 | return NULL;
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| 54 | }
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| 55 |
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| 56 | static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
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| 57 | {
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| 58 | }
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| 59 | #endif
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| 60 |
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| 61 | void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
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| 62 | unsigned long size);
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| 63 | void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
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| 64 | unsigned long size);
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| 65 | void devm_iounmap(struct device *dev, void __iomem *addr);
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| 66 | int check_signature(const volatile void __iomem *io_addr,
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| 67 | const unsigned char *signature, int length);
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| 68 | void devm_ioremap_release(struct device *dev, void *res);
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| 69 |
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| 70 | |
| 71 | * Some systems do not have legacy ISA devices.
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| 72 | * /dev/port is not a valid interface on these systems.
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| 73 | * So for those archs, <asm/io.h> should define the following symbol.
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| 74 |
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| 75 | #ifndef arch_has_dev_port
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| 76 | #define arch_has_dev_port() (1)
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| 77 | #endif
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| 78 |
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| 79 | |
| 80 | * Some systems (x86 without PAT) have a somewhat reliable way to mark a
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| 81 | * physical address range such that uncached mappings will actually
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| 82 | * end up write-combining. This facility should be used in conjunction
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| 83 | * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
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| 84 | * no effect if the per-page mechanisms are functional.
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| 85 | * (On x86 without PAT, these functions manipulate MTRRs.)
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| 86 | *
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| 87 | * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
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| 88 | * to have no effect.
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| 89 |
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| 90 | #ifndef arch_phys_wc_add
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| 91 | static inline int __must_check arch_phys_wc_add(unsigned long base,
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| 92 | unsigned long size)
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| 93 | {
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| 94 | return 0;
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| 95 | }
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| 96 |
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| 97 | static inline void arch_phys_wc_del(int handle)
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| 98 | {
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| 99 | }
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| 100 |
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| 101 | #define arch_phys_wc_add arch_phys_wc_add
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| 102 | #endif
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| 103 |
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| 104 | #endif
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