137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* arch/sh/mm/ioremap.c
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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* (C) Copyright 2005 - 2010 Paul Mundt
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*
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* Re-map IO memory to kernel address space so that we can access it.
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* This is needed for high PCI addresses that aren't mapped in the
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* 640k-1MB IO memory area on PC's
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*/
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/addrspace.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu.h>
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space. Needed when the kernel wants to access high addresses
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* directly.
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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 * __init_refok
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__ioremap_caller(phys_addr_t phys_addr, unsigned long size,
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pgprot_t pgprot, void *caller)
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{
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struct vm_struct *area;
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unsigned long offset, last_addr, addr, orig_addr;
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void __iomem *mapped;
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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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* If we can't yet use the regular approach, go the fixmap route.
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*/
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if (!mem_init_done)
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return ioremap_fixed(phys_addr, size, pgprot);
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/*
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* First try to remap through the PMB.
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* PMB entries are all pre-faulted.
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*/
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mapped = pmb_remap_caller(phys_addr, size, pgprot, caller);
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if (mapped && !IS_ERR(mapped))
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return mapped;
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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_caller(size, VM_IOREMAP, caller);
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if (!area)
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return NULL;
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area->phys_addr = phys_addr;
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orig_addr = addr = (unsigned long)area->addr;
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if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) {
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vunmap((void *)orig_addr);
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return NULL;
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}
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return (void __iomem *)(offset + (char *)orig_addr);
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}
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EXPORT_SYMBOL(__ioremap_caller);
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/*
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* Simple checks for non-translatable mappings.
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*/
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static inline int iomapping_nontranslatable(unsigned long offset)
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{
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#ifdef CONFIG_29BIT
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/*
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* In 29-bit mode this includes the fixed P1/P2 areas, as well as
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* parts of P3.
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*/
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if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX)
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return 1;
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#endif
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return 0;
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}
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void __iounmap(void __iomem *addr)
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{
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unsigned long vaddr = (unsigned long __force)addr;
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struct vm_struct *p;
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/*
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* Nothing to do if there is no translatable mapping.
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*/
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if (iomapping_nontranslatable(vaddr))
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return;
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/*
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* There's no VMA if it's from an early fixed mapping.
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*/
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if (iounmap_fixed(addr) == 0)
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return;
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/*
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* If the PMB handled it, there's nothing else to do.
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*/
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if (pmb_unmap(addr) == 0)
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return;
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p = remove_vm_area((void *)(vaddr & PAGE_MASK));
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if (!p) {
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printk(KERN_ERR "%s: bad address %p\n", __func__, addr);
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return;
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}
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kfree(p);
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}
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EXPORT_SYMBOL(__iounmap);
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