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abc5992b9d
Use more meaningful and sensible naming phys_addr instead addr in ioremap_prot(). Suggested-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Baoquan He <bhe@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220610092255.32445-1-wangkefeng.wang@huawei.com Signed-off-by: Will Deacon <will@kernel.org>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Re-map IO memory to kernel address space so that we can access it.
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* This is needed for high PCI addresses that aren't mapped in the
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* 640k-1MB IO memory area on PC's
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*/
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/io.h>
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#include <linux/export.h>
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void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
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unsigned long prot)
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{
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unsigned long offset, vaddr;
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phys_addr_t last_addr;
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struct vm_struct *area;
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/* Disallow wrap-around or zero size */
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last_addr = phys_addr + size - 1;
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if (!size || last_addr < phys_addr)
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return NULL;
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/* Page-align mappings */
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offset = phys_addr & (~PAGE_MASK);
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phys_addr -= offset;
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size = PAGE_ALIGN(size + offset);
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area = get_vm_area_caller(size, VM_IOREMAP,
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__builtin_return_address(0));
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if (!area)
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return NULL;
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vaddr = (unsigned long)area->addr;
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if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
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__pgprot(prot))) {
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free_vm_area(area);
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return NULL;
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}
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return (void __iomem *)(vaddr + offset);
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}
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EXPORT_SYMBOL(ioremap_prot);
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void iounmap(volatile void __iomem *addr)
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{
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vunmap((void *)((unsigned long)addr & PAGE_MASK));
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}
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EXPORT_SYMBOL(iounmap);
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