https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 57361846b52bc686112da6ca5368d11210796804 authored by Linus Torvalds on 02 September 2018, 21:37:30 UTC
Linux 4.19-rc2
Linux 4.19-rc2
Tip revision: 5736184
ioremap.c
/*
* ioremap implementation.
*
* Copyright (C) 2015 Cadence Design Systems Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/vmalloc.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/pgtable.h>
static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
pgprot_t prot)
{
unsigned long offset = paddr & ~PAGE_MASK;
unsigned long pfn = __phys_to_pfn(paddr);
struct vm_struct *area;
unsigned long vaddr;
int err;
paddr &= PAGE_MASK;
WARN_ON(pfn_valid(pfn));
size = PAGE_ALIGN(offset + size);
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
vaddr = (unsigned long)area->addr;
area->phys_addr = paddr;
err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
if (err) {
vunmap((void *)vaddr);
return NULL;
}
flush_cache_vmap(vaddr, vaddr + size);
return (void __iomem *)(offset + vaddr);
}
void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
{
return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
}
EXPORT_SYMBOL(xtensa_ioremap_nocache);
void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
{
return xtensa_ioremap(addr, size, PAGE_KERNEL);
}
EXPORT_SYMBOL(xtensa_ioremap_cache);
void xtensa_iounmap(volatile void __iomem *io_addr)
{
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
vunmap(addr);
}
EXPORT_SYMBOL(xtensa_iounmap);