Release 4.7 include/linux/io-mapping.h
/*
* Copyright © 2008 Keith Packard <keithp@keithp.com>
*
* 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_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
*/
#ifdef CONFIG_HAVE_ATOMIC_IOMAP
#include <asm/iomap.h>
struct io_mapping {
resource_size_t base;
unsigned long size;
pgprot_t prot;
};
/*
* 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_create_wc(resource_size_t base, unsigned long size)
{
struct io_mapping *iomap;
pgprot_t prot;
iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
if (!iomap)
goto out_err;
if (iomap_create_wc(base, size, &prot))
goto out_free;
iomap->base = base;
iomap->size = size;
iomap->prot = prot;
return iomap;
out_free:
kfree(iomap);
out_err:
return NULL;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| venkatesh pallipadi | venkatesh pallipadi | 74 | 79.57% | 2 | 66.67% |
| keith packard | keith packard | 19 | 20.43% | 1 | 33.33% |
| Total | 93 | 100.00% | 3 | 100.00% |
static inline void
io_mapping_free(struct io_mapping *mapping)
{
iomap_free(mapping->base, mapping->size);
kfree(mapping);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| venkatesh pallipadi | venkatesh pallipadi | 18 | 64.29% | 2 | 66.67% |
| keith packard | keith packard | 10 | 35.71% | 1 | 33.33% |
| Total | 28 | 100.00% | 3 | 100.00% |
/* 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);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| venkatesh pallipadi | venkatesh pallipadi | 36 | 56.25% | 1 | 25.00% |
| keith packard | keith packard | 27 | 42.19% | 2 | 50.00% |
| francisco jerez | francisco jerez | 1 | 1.56% | 1 | 25.00% |
| Total | 64 | 100.00% | 4 | 100.00% |
static inline void
io_mapping_unmap_atomic(void __iomem *vaddr)
{
iounmap_atomic(vaddr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 16 | 94.12% | 2 | 66.67% |
| francisco jerez | francisco jerez | 1 | 5.88% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
static inline void __iomem *
io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
{
resource_size_t phys_addr;
BUG_ON(offset >= mapping->size);
phys_addr = mapping->base + offset;
return ioremap_wc(phys_addr, PAGE_SIZE);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 27 | 58.70% | 2 | 40.00% |
| venkatesh pallipadi | venkatesh pallipadi | 18 | 39.13% | 2 | 40.00% |
| francisco jerez | francisco jerez | 1 | 2.17% | 1 | 20.00% |
| Total | 46 | 100.00% | 5 | 100.00% |
static inline void
io_mapping_unmap(void __iomem *vaddr)
{
iounmap(vaddr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 16 | 94.12% | 2 | 66.67% |
| francisco jerez | francisco jerez | 1 | 5.88% | 1 | 33.33% |
| Total | 17 | 100.00% | 3 | 100.00% |
#else
#include <linux/uaccess.h>
/* this struct isn't actually defined anywhere */
struct io_mapping;
/* Create the io_mapping object*/
static inline struct io_mapping *
io_mapping_create_wc(resource_size_t base, unsigned long size)
{
return (struct io_mapping __force *) ioremap_wc(base, size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 28 | 93.33% | 2 | 50.00% |
| venkatesh pallipadi | venkatesh pallipadi | 1 | 3.33% | 1 | 25.00% |
| francisco jerez | francisco jerez | 1 | 3.33% | 1 | 25.00% |
| Total | 30 | 100.00% | 4 | 100.00% |
static inline void
io_mapping_free(struct io_mapping *mapping)
{
iounmap((void __force __iomem *) mapping);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 17 | 73.91% | 2 | 66.67% |
| francisco jerez | francisco jerez | 6 | 26.09% | 1 | 33.33% |
| Total | 23 | 100.00% | 3 | 100.00% |
/* Atomic map/unmap */
static inline void __iomem *
io_mapping_map_atomic_wc(struct io_mapping *mapping,
unsigned long offset)
{
preempt_disable();
pagefault_disable();
return ((char __force __iomem *) mapping) + offset;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 28 | 75.68% | 2 | 40.00% |
| david hildenbrand | david hildenbrand | 3 | 8.11% | 1 | 20.00% |
| francisco jerez | francisco jerez | 3 | 8.11% | 1 | 20.00% |
| daniel vetter | daniel vetter | 3 | 8.11% | 1 | 20.00% |
| Total | 37 | 100.00% | 5 | 100.00% |
static inline void
io_mapping_unmap_atomic(void __iomem *vaddr)
{
pagefault_enable();
preempt_enable();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 9 | 50.00% | 1 | 25.00% |
| daniel vetter | daniel vetter | 5 | 27.78% | 1 | 25.00% |
| david hildenbrand | david hildenbrand | 3 | 16.67% | 1 | 25.00% |
| francisco jerez | francisco jerez | 1 | 5.56% | 1 | 25.00% |
| Total | 18 | 100.00% | 4 | 100.00% |
/* Non-atomic map/unmap */
static inline void __iomem *
io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
{
return ((char __force __iomem *) mapping) + offset;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 28 | 90.32% | 2 | 66.67% |
| francisco jerez | francisco jerez | 3 | 9.68% | 1 | 33.33% |
| Total | 31 | 100.00% | 3 | 100.00% |
static inline void
io_mapping_unmap(void __iomem *vaddr)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 10 | 90.91% | 2 | 66.67% |
| francisco jerez | francisco jerez | 1 | 9.09% | 1 | 33.33% |
| Total | 11 | 100.00% | 3 | 100.00% |
#endif /* HAVE_ATOMIC_IOMAP */
#endif /* _LINUX_IO_MAPPING_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| keith packard | keith packard | 266 | 55.53% | 2 | 15.38% |
| venkatesh pallipadi | venkatesh pallipadi | 166 | 34.66% | 3 | 23.08% |
| francisco jerez | francisco jerez | 19 | 3.97% | 1 | 7.69% |
| daniel vetter | daniel vetter | 11 | 2.30% | 1 | 7.69% |
| david hildenbrand | david hildenbrand | 6 | 1.25% | 1 | 7.69% |
| dave airlie | dave airlie | 3 | 0.63% | 1 | 7.69% |
| tejun heo | tejun heo | 3 | 0.63% | 1 | 7.69% |
| paul gortmaker | paul gortmaker | 3 | 0.63% | 1 | 7.69% |
| paul bolle | paul bolle | 1 | 0.21% | 1 | 7.69% |
| dan williams | dan williams | 1 | 0.21% | 1 | 7.69% |
| Total | 479 | 100.00% | 13 | 100.00% |
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