projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1162b070 VG |
1 | /* |
| 2 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/vmalloc.h> | |
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/io.h> | |
| 13 | #include <linux/mm.h> | |
| 14 | #include <linux/slab.h> | |
| 15 | #include <asm/cache.h> | |
| 16 | ||
| 17 | void __iomem *ioremap(unsigned long paddr, unsigned long size) | |
| 18 | { | |
| 19 | unsigned long vaddr; | |
| 20 | struct vm_struct *area; | |
| 21 | unsigned long off, end; | |
| 22 | const pgprot_t prot = PAGE_KERNEL_NO_CACHE; | |
| 23 | ||
| 24 | /* Don't allow wraparound or zero size */ | |
| 25 | end = paddr + size - 1; | |
| 26 | if (!size || (end < paddr)) | |
| 27 | return NULL; | |
| 28 | ||
| 29 | /* If the region is h/w uncached, nothing special needed */ | |
| 30 | if (paddr >= ARC_UNCACHED_ADDR_SPACE) | |
| 31 | return (void __iomem *)paddr; | |
| 32 | ||
| 33 | /* An early platform driver might end up here */ | |
| 34 | if (!slab_is_available()) | |
| 35 | return NULL; | |
| 36 | ||
| 37 | /* Mappings have to be page-aligned, page-sized */ | |
| 38 | off = paddr & ~PAGE_MASK; | |
| 39 | paddr &= PAGE_MASK; | |
| 40 | size = PAGE_ALIGN(end + 1) - paddr; | |
| 41 | ||
| 42 | /* | |
| 43 | * Ok, go for it.. | |
| 44 | */ | |
| 45 | area = get_vm_area(size, VM_IOREMAP); | |
| 46 | if (!area) | |
| 47 | return NULL; | |
| 48 | ||
| 49 | area->phys_addr = paddr; | |
| 50 | vaddr = (unsigned long)area->addr; | |
| 51 | if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) { | |
| 52 | vfree(area->addr); | |
| 53 | return NULL; | |
| 54 | } | |
| 55 | ||
| 56 | return (void __iomem *)(off + (char __iomem *)vaddr); | |
| 57 | } | |
| 58 | EXPORT_SYMBOL(ioremap); | |
| 59 | ||
| 60 | void iounmap(const void __iomem *addr) | |
| 61 | { | |
| 62 | if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE) | |
| 63 | return; | |
| 64 | ||
| 65 | vfree((void *)(PAGE_MASK & (unsigned long __force)addr)); | |
| 66 | } | |
| 67 | EXPORT_SYMBOL(iounmap); |