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100 lines
2.4 KiB
100 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/parisc/mm/ioremap.c |
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* |
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* (C) Copyright 1995 1996 Linus Torvalds |
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* (C) Copyright 2001-2019 Helge Deller <[email protected]> |
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* (C) Copyright 2005 Kyle McMartin <[email protected]> |
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*/ |
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#include <linux/vmalloc.h> |
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#include <linux/errno.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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/* |
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* Generic mapping function (not visible outside): |
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*/ |
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/* |
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* Remap an arbitrary physical address space into the kernel virtual |
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* address space. |
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* |
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* NOTE! We need to allow non-page-aligned mappings too: we will obviously |
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* have to convert them into an offset in a page-aligned mapping, but the |
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* caller shouldn't need to know that small detail. |
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*/ |
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void __iomem *ioremap(unsigned long phys_addr, unsigned long size) |
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{ |
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void __iomem *addr; |
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struct vm_struct *area; |
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unsigned long offset, last_addr; |
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pgprot_t pgprot; |
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#ifdef CONFIG_EISA |
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unsigned long end = phys_addr + size - 1; |
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/* Support EISA addresses */ |
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if ((phys_addr >= 0x00080000 && end < 0x000fffff) || |
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(phys_addr >= 0x00500000 && end < 0x03bfffff)) |
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phys_addr |= F_EXTEND(0xfc000000); |
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#endif |
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/* Don't allow wraparound or zero size */ |
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last_addr = phys_addr + size - 1; |
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if (!size || last_addr < phys_addr) |
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return NULL; |
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/* |
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* Don't allow anybody to remap normal RAM that we're using.. |
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*/ |
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if (phys_addr < virt_to_phys(high_memory)) { |
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char *t_addr, *t_end; |
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struct page *page; |
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t_addr = __va(phys_addr); |
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t_end = t_addr + (size - 1); |
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for (page = virt_to_page(t_addr); |
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page <= virt_to_page(t_end); page++) { |
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if(!PageReserved(page)) |
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return NULL; |
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} |
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} |
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pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | |
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_PAGE_ACCESSED | _PAGE_NO_CACHE); |
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/* |
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* Mappings have to be page-aligned |
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*/ |
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offset = phys_addr & ~PAGE_MASK; |
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phys_addr &= PAGE_MASK; |
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size = PAGE_ALIGN(last_addr + 1) - phys_addr; |
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/* |
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* Ok, go for it.. |
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*/ |
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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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addr = (void __iomem *) area->addr; |
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if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, |
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phys_addr, pgprot)) { |
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vunmap(addr); |
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return NULL; |
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} |
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return (void __iomem *) (offset + (char __iomem *)addr); |
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} |
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EXPORT_SYMBOL(ioremap); |
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void iounmap(const volatile void __iomem *io_addr) |
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{ |
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unsigned long addr = (unsigned long)io_addr & PAGE_MASK; |
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if (is_vmalloc_addr((void *)addr)) |
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vunmap((void *)addr); |
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} |
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EXPORT_SYMBOL(iounmap);
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