io.h
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/*
* 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 <linux/types.h>
#include <asm/io.h>
#include <asm/page.h>
struct device;
void __iowrite32_copy(void __iomem *to, const void *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
/*
* Managed iomap interface
*/
#ifdef CONFIG_HAS_IOPORT
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
void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
unsigned long size);
void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
unsigned long 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);
/*
* 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
#endif
#endif /* _LINUX_IO_H */