/* * Copyright 2006 PathScale, Inc. All Rights Reserved. * * This file is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef _LINUX_IO_H #define _LINUX_IO_H #include #include #include #include #include #include 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_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_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_ZONE_DEVICE void *devm_memremap_pages(struct device *dev, struct resource *res); #else static inline void *devm_memremap_pages(struct device *dev, struct resource *res) { /* * Fail attempts to call devm_memremap_pages() without * ZONE_DEVICE support enabled, this requires callers to fall * back to plain devm_memremap() based on config */ WARN_ON_ONCE(1); return ERR_PTR(-ENXIO); } #endif /* * Some systems do not have legacy ISA devices. * /dev/port is not a valid interface on these systems. * So for those archs, 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, }; 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 */