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e9b0a071 | 1 | /* |
9b50ffb0 | 2 | * (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P. |
e9b0a071 BH |
3 | * Bjorn Helgaas <bjorn.helgaas@hp.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/compiler.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/efi.h> | |
9b50ffb0 BH |
13 | #include <linux/io.h> |
14 | #include <linux/vmalloc.h> | |
e9b0a071 | 15 | #include <asm/io.h> |
32e62c63 | 16 | #include <asm/meminit.h> |
e9b0a071 BH |
17 | |
18 | static inline void __iomem * | |
9b50ffb0 | 19 | __ioremap (unsigned long phys_addr) |
e9b0a071 | 20 | { |
c4add2e5 | 21 | return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr); |
e9b0a071 BH |
22 | } |
23 | ||
cd7bcf32 TL |
24 | void __iomem * |
25 | early_ioremap (unsigned long phys_addr, unsigned long size) | |
26 | { | |
27 | return __ioremap(phys_addr); | |
28 | } | |
29 | ||
e9b0a071 | 30 | void __iomem * |
c4add2e5 | 31 | ioremap (unsigned long phys_addr, unsigned long size) |
e9b0a071 | 32 | { |
9b50ffb0 BH |
33 | void __iomem *addr; |
34 | struct vm_struct *area; | |
35 | unsigned long offset; | |
36 | pgprot_t prot; | |
32e62c63 BH |
37 | u64 attr; |
38 | unsigned long gran_base, gran_size; | |
9b50ffb0 | 39 | unsigned long page_base; |
e9b0a071 | 40 | |
32e62c63 BH |
41 | /* |
42 | * For things in kern_memmap, we must use the same attribute | |
43 | * as the rest of the kernel. For more details, see | |
44 | * Documentation/ia64/aliasing.txt. | |
45 | */ | |
c4add2e5 | 46 | attr = kern_mem_attribute(phys_addr, size); |
32e62c63 | 47 | if (attr & EFI_MEMORY_WB) |
c4add2e5 | 48 | return (void __iomem *) phys_to_virt(phys_addr); |
32e62c63 | 49 | else if (attr & EFI_MEMORY_UC) |
9b50ffb0 | 50 | return __ioremap(phys_addr); |
c1c57d76 | 51 | |
e9b0a071 | 52 | /* |
32e62c63 BH |
53 | * Some chipsets don't support UC access to memory. If |
54 | * WB is supported for the whole granule, we prefer that. | |
e9b0a071 | 55 | */ |
c4add2e5 BH |
56 | gran_base = GRANULEROUNDDOWN(phys_addr); |
57 | gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base; | |
32e62c63 | 58 | if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB) |
c4add2e5 | 59 | return (void __iomem *) phys_to_virt(phys_addr); |
32e62c63 | 60 | |
9b50ffb0 BH |
61 | /* |
62 | * WB is not supported for the whole granule, so we can't use | |
63 | * the region 7 identity mapping. If we can safely cover the | |
64 | * area with kernel page table mappings, we can use those | |
65 | * instead. | |
66 | */ | |
67 | page_base = phys_addr & PAGE_MASK; | |
68 | size = PAGE_ALIGN(phys_addr + size) - page_base; | |
69 | if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) { | |
70 | prot = PAGE_KERNEL; | |
71 | ||
72 | /* | |
73 | * Mappings have to be page-aligned | |
74 | */ | |
75 | offset = phys_addr & ~PAGE_MASK; | |
76 | phys_addr &= PAGE_MASK; | |
77 | ||
78 | /* | |
79 | * Ok, go for it.. | |
80 | */ | |
81 | area = get_vm_area(size, VM_IOREMAP); | |
82 | if (!area) | |
83 | return NULL; | |
84 | ||
85 | area->phys_addr = phys_addr; | |
86 | addr = (void __iomem *) area->addr; | |
87 | if (ioremap_page_range((unsigned long) addr, | |
88 | (unsigned long) addr + size, phys_addr, prot)) { | |
89 | vunmap((void __force *) addr); | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | return (void __iomem *) (offset + (char __iomem *)addr); | |
94 | } | |
95 | ||
96 | return __ioremap(phys_addr); | |
e9b0a071 BH |
97 | } |
98 | EXPORT_SYMBOL(ioremap); | |
99 | ||
100 | void __iomem * | |
c4add2e5 | 101 | ioremap_nocache (unsigned long phys_addr, unsigned long size) |
e9b0a071 | 102 | { |
c4add2e5 | 103 | if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) |
e037cda5 | 104 | return NULL; |
32e62c63 | 105 | |
9b50ffb0 | 106 | return __ioremap(phys_addr); |
e9b0a071 BH |
107 | } |
108 | EXPORT_SYMBOL(ioremap_nocache); | |
9b50ffb0 | 109 | |
cd7bcf32 TL |
110 | void |
111 | early_iounmap (volatile void __iomem *addr, unsigned long size) | |
112 | { | |
113 | } | |
114 | ||
9b50ffb0 BH |
115 | void |
116 | iounmap (volatile void __iomem *addr) | |
117 | { | |
118 | if (REGION_NUMBER(addr) == RGN_GATE) | |
119 | vunmap((void *) ((unsigned long) addr & PAGE_MASK)); | |
120 | } | |
121 | EXPORT_SYMBOL(iounmap); |