72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/io.h>
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#include <asm/pgtable.h>
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static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size,
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pgprot_t prot, void *caller)
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{
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phys_addr_t last_addr;
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unsigned long offset, vaddr;
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struct vm_struct *area;
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last_addr = addr + size - 1;
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if (!size || last_addr < addr)
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return NULL;
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offset = addr & (~PAGE_MASK);
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addr &= PAGE_MASK;
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size = PAGE_ALIGN(size + offset);
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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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vaddr = (unsigned long)area->addr;
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if (ioremap_page_range(vaddr, vaddr + size, addr, 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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void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
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{
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return __ioremap_caller(phys_addr, size, prot,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(__ioremap);
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void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
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{
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return __ioremap_caller(phys_addr, size, PAGE_KERNEL,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_cache);
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void iounmap(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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pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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if (!pfn_valid(pfn)) {
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return pgprot_noncached(vma_prot);
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} else if (file->f_flags & O_SYNC) {
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return pgprot_writecombine(vma_prot);
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}
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return vma_prot;
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}
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EXPORT_SYMBOL(phys_mem_access_prot);
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