Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * (C) Copyright 1995 1996 Linus Torvalds * (C) Copyright 2001, 2002 Ralf Baechle */ #include <linux/export.h> #include <asm/addrspace.h> #include <asm/byteorder.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/mm_types.h> #include <linux/io.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> #include <ioremap.h> #define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL)) #define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1) static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages, void *arg) { unsigned long i; for (i = 0; i < nr_pages; i++) { if (pfn_valid(start_pfn + i) && !PageReserved(pfn_to_page(start_pfn + i))) return 1; } return 0; } /* * ioremap_prot - map bus memory into CPU space * @phys_addr: bus address of the memory * @size: size of the resource to map * * ioremap_prot gives the caller control over cache coherency attributes (CCA) */ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size, unsigned long prot_val) { unsigned long flags = prot_val & _CACHE_MASK; unsigned long offset, pfn, last_pfn; struct vm_struct *area; phys_addr_t last_addr; unsigned long vaddr; void __iomem *cpu_addr; cpu_addr = plat_ioremap(phys_addr, size, flags); if (cpu_addr) return cpu_addr; phys_addr = fixup_bigphys_addr(phys_addr, size); /* Don't allow wraparound or zero size */ last_addr = phys_addr + size - 1; if (!size || last_addr < phys_addr) return NULL; /* * Map uncached objects in the low 512mb of address space using KSEG1, * otherwise map using page tables. */ if (IS_LOW512(phys_addr) && IS_LOW512(last_addr) && flags == _CACHE_UNCACHED) return (void __iomem *) CKSEG1ADDR(phys_addr); /* * Don't allow anybody to remap RAM that may be allocated by the page * allocator, since that could lead to races & data clobbering. */ pfn = PFN_DOWN(phys_addr); last_pfn = PFN_DOWN(last_addr); if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL, __ioremap_check_ram) == 1) { WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n", &phys_addr, &last_addr); return NULL; } /* * Mappings have to be page-aligned */ offset = phys_addr & ~PAGE_MASK; phys_addr &= PAGE_MASK; size = PAGE_ALIGN(last_addr + 1) - phys_addr; /* * Ok, go for it.. */ area = get_vm_area(size, VM_IOREMAP); if (!area) return NULL; vaddr = (unsigned long)area->addr; flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE; if (ioremap_page_range(vaddr, vaddr + size, phys_addr, __pgprot(flags))) { free_vm_area(area); return NULL; } return (void __iomem *)(vaddr + offset); } EXPORT_SYMBOL(ioremap_prot); void iounmap(const volatile void __iomem *addr) { if (!plat_iounmap(addr) && !IS_KSEG1(addr)) vunmap((void *)((unsigned long)addr & PAGE_MASK)); } EXPORT_SYMBOL(iounmap); |