| 1 | |
| 2 | |
| 3 | * Re-map IO memory to kernel address space so that we can access it.
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| 4 | * This is needed for high PCI addresses that aren't mapped in the
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| 5 | * 640k-1MB IO memory area on PC's
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| 6 | *
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| 7 | * (C) Copyright 1995 1996 Linus Torvalds
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| 8 |
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| 9 | #include <linux/vmalloc.h>
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| 10 | #include <linux/mm.h>
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| 11 | #include <linux/io.h>
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| 12 | #include <linux/export.h>
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| 13 | #include <linux/ioremap.h>
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| 14 |
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| 15 | void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
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| 16 | pgprot_t prot)
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| 17 | {
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| 18 | unsigned long offset, vaddr;
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| 19 | phys_addr_t last_addr;
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| 20 | struct vm_struct *area;
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| 21 |
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| 22 |
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| 23 | if (WARN_ON_ONCE(!slab_is_available()))
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| 24 | return NULL;
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| 25 |
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| 26 |
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| 27 | last_addr = phys_addr + size - 1;
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| 28 | if (!size || last_addr < phys_addr)
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| 29 | return NULL;
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| 30 |
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| 31 |
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| 32 | offset = phys_addr & (~PAGE_MASK);
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| 33 | phys_addr -= offset;
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| 34 | size = PAGE_ALIGN(size + offset);
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| 35 |
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| 36 | area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START,
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| 37 | IOREMAP_END, __builtin_return_address(0));
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| 38 | if (!area)
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| 39 | return NULL;
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| 40 | vaddr = (unsigned long)area->addr;
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| 41 | area->phys_addr = phys_addr;
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| 42 |
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| 43 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
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| 44 | free_vm_area(area);
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| 45 | return NULL;
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| 46 | }
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| 47 |
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| 48 | return (void __iomem *)(vaddr + offset);
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| 49 | }
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| 50 |
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| 51 | #ifndef ioremap_prot
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| 52 | void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
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| 53 | pgprot_t prot)
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| 54 | {
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| 55 | return generic_ioremap_prot(phys_addr, size, prot);
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| 56 | }
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| 57 | EXPORT_SYMBOL(ioremap_prot);
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| 58 | #endif
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| 59 |
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| 60 | void generic_iounmap(volatile void __iomem *addr)
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| 61 | {
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| 62 | void *vaddr = (void *)((unsigned long)addr & PAGE_MASK);
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| 63 |
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| 64 | if (is_ioremap_addr(vaddr))
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| 65 | vunmap(vaddr);
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| 66 | }
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| 67 |
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| 68 | #ifndef iounmap
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| 69 | void iounmap(volatile void __iomem *addr)
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| 70 | {
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| 71 | generic_iounmap(addr);
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| 72 | }
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| 73 | EXPORT_SYMBOL(iounmap);
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| 74 | #endif
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