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b7f3785f RK |
1 | /* |
2 | * I/O remap functions for Hexagon | |
3 | * | |
e1858b2a | 4 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
b7f3785f RK |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 and | |
8 | * only version 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/io.h> | |
22 | #include <linux/vmalloc.h> | |
cb84c2b4 | 23 | #include <linux/mm.h> |
b7f3785f RK |
24 | |
25 | void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size) | |
26 | { | |
27 | unsigned long last_addr, addr; | |
28 | unsigned long offset = phys_addr & ~PAGE_MASK; | |
29 | struct vm_struct *area; | |
30 | ||
31 | pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE | |
32 | |(__HEXAGON_C_DEV << 6)); | |
33 | ||
34 | last_addr = phys_addr + size - 1; | |
35 | ||
36 | /* Wrapping not allowed */ | |
37 | if (!size || (last_addr < phys_addr)) | |
38 | return NULL; | |
39 | ||
40 | /* Rounds up to next page size, including whole-page offset */ | |
41 | size = PAGE_ALIGN(offset + size); | |
42 | ||
43 | area = get_vm_area(size, VM_IOREMAP); | |
44 | addr = (unsigned long)area->addr; | |
45 | ||
46 | if (ioremap_page_range(addr, addr+size, phys_addr, prot)) { | |
47 | vunmap((void *)addr); | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | return (void __iomem *) (offset + addr); | |
52 | } | |
53 | ||
54 | void __iounmap(const volatile void __iomem *addr) | |
55 | { | |
56 | vunmap((void *) ((unsigned long) addr & PAGE_MASK)); | |
57 | } |