forked from mirrors/linux
5bb8def55d
Map physical memory outside KIO region into the vmalloc area. Unmap it with vunmap. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
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* ioremap implementation.
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*
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* Copyright (C) 2015 Cadence Design Systems Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 <asm/cacheflush.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
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pgprot_t prot)
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{
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unsigned long offset = paddr & ~PAGE_MASK;
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unsigned long pfn = __phys_to_pfn(paddr);
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struct vm_struct *area;
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unsigned long vaddr;
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int err;
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paddr &= PAGE_MASK;
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WARN_ON(pfn_valid(pfn));
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size = PAGE_ALIGN(offset + size);
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area = get_vm_area(size, VM_IOREMAP);
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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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area->phys_addr = paddr;
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err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
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if (err) {
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vunmap((void *)vaddr);
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return NULL;
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}
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flush_cache_vmap(vaddr, vaddr + size);
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return (void __iomem *)(offset + vaddr);
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}
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void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
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{
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return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
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}
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EXPORT_SYMBOL(xtensa_ioremap_nocache);
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void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
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{
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return xtensa_ioremap(addr, size, PAGE_KERNEL);
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}
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EXPORT_SYMBOL(xtensa_ioremap_cache);
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void xtensa_iounmap(volatile void __iomem *io_addr)
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{
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void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
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vunmap(addr);
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}
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EXPORT_SYMBOL(xtensa_iounmap);
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