Current File : //usr/src/linux-headers-5.15.0-125-generic/include/linux/io.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2006 PathScale, Inc. All Rights Reserved.
*/
#ifndef _LINUX_IO_H
#define _LINUX_IO_H
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <asm/io.h>
#include <asm/page.h>
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
/*
* 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_uc(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 __iomem *devm_ioremap_np(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);
#ifdef CONFIG_PCI
/*
* The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
* Posting") mandate non-posted configuration transactions. This default
* implementation attempts to use the ioremap_np() API to provide this
* on arches that support it, and falls back to ioremap() on those that
* don't. Overriding this function is deprecated; arches that properly
* support non-posted accesses should implement ioremap_np() instead, which
* this default implementation can then use to return mappings compliant with
* the PCI specification.
*/
#ifndef pci_remap_cfgspace
#define pci_remap_cfgspace pci_remap_cfgspace
static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
size_t size)
{
return ioremap_np(offset, size) ?: ioremap(offset, size);
}
#endif
#endif
/*
* 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
#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,
MEMREMAP_WC = 1 << 2,
MEMREMAP_ENC = 1 << 3,
MEMREMAP_DEC = 1 << 4,
};
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 */
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