45 строки
1.0 KiB
C
45 строки
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* I/O remap functions for Hexagon
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*/
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#include <linux/io.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
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{
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unsigned long last_addr, addr;
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unsigned long offset = phys_addr & ~PAGE_MASK;
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struct vm_struct *area;
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pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
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|(__HEXAGON_C_DEV << 6));
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last_addr = phys_addr + size - 1;
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/* Wrapping not allowed */
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if (!size || (last_addr < phys_addr))
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return NULL;
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/* Rounds up to next page size, including whole-page offset */
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size = PAGE_ALIGN(offset + size);
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area = get_vm_area(size, VM_IOREMAP);
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addr = (unsigned long)area->addr;
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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 (void __iomem *) (offset + addr);
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}
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void iounmap(const 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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