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44 lines
1.0 KiB
44 lines
1.0 KiB
// 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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