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1 | /* |
2 | * (c) Copyright 2006 Hewlett-Packard Development Company, L.P. | |
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> | |
13 | #include <asm/io.h> | |
32e62c63 | 14 | #include <asm/meminit.h> |
e9b0a071 BH |
15 | |
16 | static inline void __iomem * | |
c4add2e5 | 17 | __ioremap (unsigned long phys_addr, unsigned long size) |
e9b0a071 | 18 | { |
c4add2e5 | 19 | return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr); |
e9b0a071 BH |
20 | } |
21 | ||
22 | void __iomem * | |
c4add2e5 | 23 | ioremap (unsigned long phys_addr, unsigned long size) |
e9b0a071 | 24 | { |
32e62c63 BH |
25 | u64 attr; |
26 | unsigned long gran_base, gran_size; | |
e9b0a071 | 27 | |
32e62c63 BH |
28 | /* |
29 | * For things in kern_memmap, we must use the same attribute | |
30 | * as the rest of the kernel. For more details, see | |
31 | * Documentation/ia64/aliasing.txt. | |
32 | */ | |
c4add2e5 | 33 | attr = kern_mem_attribute(phys_addr, size); |
32e62c63 | 34 | if (attr & EFI_MEMORY_WB) |
c4add2e5 | 35 | return (void __iomem *) phys_to_virt(phys_addr); |
32e62c63 | 36 | else if (attr & EFI_MEMORY_UC) |
c4add2e5 | 37 | return __ioremap(phys_addr, size); |
c1c57d76 | 38 | |
e9b0a071 | 39 | /* |
32e62c63 BH |
40 | * Some chipsets don't support UC access to memory. If |
41 | * WB is supported for the whole granule, we prefer that. | |
e9b0a071 | 42 | */ |
c4add2e5 BH |
43 | gran_base = GRANULEROUNDDOWN(phys_addr); |
44 | gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base; | |
32e62c63 | 45 | if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB) |
c4add2e5 | 46 | return (void __iomem *) phys_to_virt(phys_addr); |
32e62c63 | 47 | |
c4add2e5 | 48 | return __ioremap(phys_addr, size); |
e9b0a071 BH |
49 | } |
50 | EXPORT_SYMBOL(ioremap); | |
51 | ||
52 | void __iomem * | |
c4add2e5 | 53 | ioremap_nocache (unsigned long phys_addr, unsigned long size) |
e9b0a071 | 54 | { |
c4add2e5 | 55 | if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB) |
e037cda5 | 56 | return NULL; |
32e62c63 | 57 | |
c4add2e5 | 58 | return __ioremap(phys_addr, size); |
e9b0a071 BH |
59 | } |
60 | EXPORT_SYMBOL(ioremap_nocache); |