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65 lines
1.4 KiB
65 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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#include <linux/io.h> |
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#include <linux/vmalloc.h> |
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#include <linux/pgtable.h> |
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#include <asm/cacheflush.h> |
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#include <asm/io.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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