65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*/
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/cache.h>
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static inline bool arc_uncached_addr_space(phys_addr_t paddr)
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{
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if (is_isa_arcompact()) {
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if (paddr >= ARC_UNCACHED_ADDR_SPACE)
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return true;
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} else if (paddr >= perip_base && paddr <= perip_end) {
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return true;
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}
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return false;
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}
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void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
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{
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/*
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* If the region is h/w uncached, MMU mapping can be elided as optim
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* The cast to u32 is fine as this region can only be inside 4GB
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*/
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if (arc_uncached_addr_space(paddr))
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return (void __iomem *)(u32)paddr;
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return ioremap_prot(paddr, size,
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pgprot_val(pgprot_noncached(PAGE_KERNEL)));
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}
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EXPORT_SYMBOL(ioremap);
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/*
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* ioremap with access flags
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* Cache semantics wise it is same as ioremap - "forced" uncached.
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* However unlike vanilla ioremap which bypasses ARC MMU for addresses in
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* ARC hardware uncached region, this one still goes thru the MMU as caller
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* might need finer access control (R/W/X)
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*/
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void __iomem *ioremap_prot(phys_addr_t paddr, size_t size,
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unsigned long flags)
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{
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pgprot_t prot = __pgprot(flags);
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/* force uncached */
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return generic_ioremap_prot(paddr, size, pgprot_noncached(prot));
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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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/* weird double cast to handle phys_addr_t > 32 bits */
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if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
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return;
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generic_iounmap(addr);
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}
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EXPORT_SYMBOL(iounmap);
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