63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/vmalloc.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <asm/pgtable.h>
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void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
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static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
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void *caller)
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{
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struct vm_struct *area;
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unsigned long addr, offset, last_addr;
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pgprot_t prot;
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/* Don't allow wraparound 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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/*
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* Mappings have to be page-aligned
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*/
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offset = phys_addr & ~PAGE_MASK;
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phys_addr &= PAGE_MASK;
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size = PAGE_ALIGN(last_addr + 1) - phys_addr;
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/*
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* Ok, go for it..
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*/
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area = get_vm_area_caller(size, VM_IOREMAP, caller);
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if (!area)
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return NULL;
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area->phys_addr = phys_addr;
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addr = (unsigned long)area->addr;
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prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D |
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_PAGE_G | _PAGE_C_DEV);
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if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
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vunmap((void *)addr);
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return NULL;
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}
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return (__force void __iomem *)(offset + (char *)addr);
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}
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void __iomem *ioremap(phys_addr_t phys_addr, size_t size)
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{
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return __ioremap_caller(phys_addr, size,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap);
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void iounmap(volatile void __iomem * addr)
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{
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vunmap((void *)(PAGE_MASK & (unsigned long)addr));
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}
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EXPORT_SYMBOL(iounmap);
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