Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/cris/mm/ioremap.c |
| 3 | * |
| 4 | * Re-map IO memory to kernel address space so that we can access it. |
| 5 | * Needed for memory-mapped I/O devices mapped outside our normal DRAM |
| 6 | * window (that is, all memory-mapped I/O devices). |
| 7 | * |
| 8 | * (C) Copyright 1995 1996 Linus Torvalds |
| 9 | * CRIS-port by Axis Communications AB |
| 10 | */ |
| 11 | |
| 12 | #include <linux/vmalloc.h> |
Haavard Skinnemoen | e32cbc3 | 2006-09-30 23:29:17 -0700 | [diff] [blame] | 13 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <asm/pgalloc.h> |
Jesper Nilsson | 556dcee | 2008-10-21 17:45:58 +0200 | [diff] [blame] | 15 | #include <arch/memmap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | /* |
| 18 | * Generic mapping function (not visible outside): |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * Remap an arbitrary physical address space into the kernel virtual |
| 23 | * address space. Needed when the kernel wants to access high addresses |
| 24 | * directly. |
| 25 | * |
| 26 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 27 | * have to convert them into an offset in a page-aligned mapping, but the |
| 28 | * caller shouldn't need to know that small detail. |
| 29 | */ |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 30 | void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 32 | void __iomem * addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | struct vm_struct * area; |
| 34 | unsigned long offset, last_addr; |
| 35 | |
| 36 | /* Don't allow wraparound or zero size */ |
| 37 | last_addr = phys_addr + size - 1; |
| 38 | if (!size || last_addr < phys_addr) |
| 39 | return NULL; |
| 40 | |
| 41 | /* |
| 42 | * Mappings have to be page-aligned |
| 43 | */ |
| 44 | offset = phys_addr & ~PAGE_MASK; |
| 45 | phys_addr &= PAGE_MASK; |
| 46 | size = PAGE_ALIGN(last_addr+1) - phys_addr; |
| 47 | |
| 48 | /* |
| 49 | * Ok, go for it.. |
| 50 | */ |
| 51 | area = get_vm_area(size, VM_IOREMAP); |
| 52 | if (!area) |
| 53 | return NULL; |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 54 | addr = (void __iomem *)area->addr; |
Haavard Skinnemoen | e32cbc3 | 2006-09-30 23:29:17 -0700 | [diff] [blame] | 55 | if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, |
| 56 | phys_addr, prot)) { |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 57 | vfree((void __force *)addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | return NULL; |
| 59 | } |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 60 | return (void __iomem *) (offset + (char __iomem *)addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 63 | void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) |
| 64 | { |
| 65 | return __ioremap_prot(phys_addr, size, |
| 66 | __pgprot(_PAGE_PRESENT | __READABLE | |
| 67 | __WRITEABLE | _PAGE_GLOBAL | |
| 68 | _PAGE_KERNEL | flags)); |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * ioremap_nocache - map bus memory into CPU space |
| 73 | * @offset: bus address of the memory |
| 74 | * @size: size of the resource to map |
| 75 | * |
| 76 | * Must be freed with iounmap. |
| 77 | */ |
| 78 | |
Jesper Nilsson | 82e6df1 | 2014-10-01 15:38:38 +0200 | [diff] [blame] | 79 | void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size) |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 80 | { |
| 81 | return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0); |
| 82 | } |
Jesper Nilsson | 82e6df1 | 2014-10-01 15:38:38 +0200 | [diff] [blame] | 83 | EXPORT_SYMBOL(ioremap_nocache); |
Mikael Starvik | 4f18cfb | 2005-07-27 11:44:39 -0700 | [diff] [blame] | 84 | |
| 85 | void iounmap(volatile void __iomem *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
| 87 | if (addr > high_memory) |
| 88 | return vfree((void *) (PAGE_MASK & (unsigned long) addr)); |
| 89 | } |