mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 8 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081207.443595178@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
190 lines
3.7 KiB
C
190 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright © 2008 Keith Packard <keithp@keithp.com>
|
|
*/
|
|
|
|
#ifndef _LINUX_IO_MAPPING_H
|
|
#define _LINUX_IO_MAPPING_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/io.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* The io_mapping mechanism provides an abstraction for mapping
|
|
* individual pages from an io device to the CPU in an efficient fashion.
|
|
*
|
|
* See Documentation/io-mapping.txt
|
|
*/
|
|
|
|
struct io_mapping {
|
|
resource_size_t base;
|
|
unsigned long size;
|
|
pgprot_t prot;
|
|
void __iomem *iomem;
|
|
};
|
|
|
|
#ifdef CONFIG_HAVE_ATOMIC_IOMAP
|
|
|
|
#include <asm/iomap.h>
|
|
/*
|
|
* For small address space machines, mapping large objects
|
|
* into the kernel virtual space isn't practical. Where
|
|
* available, use fixmap support to dynamically map pages
|
|
* of the object at run time.
|
|
*/
|
|
|
|
static inline struct io_mapping *
|
|
io_mapping_init_wc(struct io_mapping *iomap,
|
|
resource_size_t base,
|
|
unsigned long size)
|
|
{
|
|
pgprot_t prot;
|
|
|
|
if (iomap_create_wc(base, size, &prot))
|
|
return NULL;
|
|
|
|
iomap->base = base;
|
|
iomap->size = size;
|
|
iomap->prot = prot;
|
|
return iomap;
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_fini(struct io_mapping *mapping)
|
|
{
|
|
iomap_free(mapping->base, mapping->size);
|
|
}
|
|
|
|
/* Atomic map/unmap */
|
|
static inline void __iomem *
|
|
io_mapping_map_atomic_wc(struct io_mapping *mapping,
|
|
unsigned long offset)
|
|
{
|
|
resource_size_t phys_addr;
|
|
unsigned long pfn;
|
|
|
|
BUG_ON(offset >= mapping->size);
|
|
phys_addr = mapping->base + offset;
|
|
pfn = (unsigned long) (phys_addr >> PAGE_SHIFT);
|
|
return iomap_atomic_prot_pfn(pfn, mapping->prot);
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_unmap_atomic(void __iomem *vaddr)
|
|
{
|
|
iounmap_atomic(vaddr);
|
|
}
|
|
|
|
static inline void __iomem *
|
|
io_mapping_map_wc(struct io_mapping *mapping,
|
|
unsigned long offset,
|
|
unsigned long size)
|
|
{
|
|
resource_size_t phys_addr;
|
|
|
|
BUG_ON(offset >= mapping->size);
|
|
phys_addr = mapping->base + offset;
|
|
|
|
return ioremap_wc(phys_addr, size);
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_unmap(void __iomem *vaddr)
|
|
{
|
|
iounmap(vaddr);
|
|
}
|
|
|
|
#else
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
/* Create the io_mapping object*/
|
|
static inline struct io_mapping *
|
|
io_mapping_init_wc(struct io_mapping *iomap,
|
|
resource_size_t base,
|
|
unsigned long size)
|
|
{
|
|
iomap->base = base;
|
|
iomap->size = size;
|
|
iomap->iomem = ioremap_wc(base, size);
|
|
#if defined(pgprot_noncached_wc) /* archs can't agree on a name ... */
|
|
iomap->prot = pgprot_noncached_wc(PAGE_KERNEL);
|
|
#elif defined(pgprot_writecombine)
|
|
iomap->prot = pgprot_writecombine(PAGE_KERNEL);
|
|
#else
|
|
iomap->prot = pgprot_noncached(PAGE_KERNEL);
|
|
#endif
|
|
|
|
return iomap;
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_fini(struct io_mapping *mapping)
|
|
{
|
|
iounmap(mapping->iomem);
|
|
}
|
|
|
|
/* Non-atomic map/unmap */
|
|
static inline void __iomem *
|
|
io_mapping_map_wc(struct io_mapping *mapping,
|
|
unsigned long offset,
|
|
unsigned long size)
|
|
{
|
|
return mapping->iomem + offset;
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_unmap(void __iomem *vaddr)
|
|
{
|
|
}
|
|
|
|
/* Atomic map/unmap */
|
|
static inline void __iomem *
|
|
io_mapping_map_atomic_wc(struct io_mapping *mapping,
|
|
unsigned long offset)
|
|
{
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
return io_mapping_map_wc(mapping, offset, PAGE_SIZE);
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_unmap_atomic(void __iomem *vaddr)
|
|
{
|
|
io_mapping_unmap(vaddr);
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|
|
|
|
#endif /* HAVE_ATOMIC_IOMAP */
|
|
|
|
static inline struct io_mapping *
|
|
io_mapping_create_wc(resource_size_t base,
|
|
unsigned long size)
|
|
{
|
|
struct io_mapping *iomap;
|
|
|
|
iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
|
|
if (!iomap)
|
|
return NULL;
|
|
|
|
if (!io_mapping_init_wc(iomap, base, size)) {
|
|
kfree(iomap);
|
|
return NULL;
|
|
}
|
|
|
|
return iomap;
|
|
}
|
|
|
|
static inline void
|
|
io_mapping_free(struct io_mapping *iomap)
|
|
{
|
|
io_mapping_fini(iomap);
|
|
kfree(iomap);
|
|
}
|
|
|
|
#endif /* _LINUX_IO_MAPPING_H */
|