Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/mm/ioremap.c |
| 3 | * |
Paul Mundt | d9b9487 | 2010-01-18 21:08:32 +0900 | [diff] [blame] | 4 | * (C) Copyright 1995 1996 Linus Torvalds |
| 5 | * (C) Copyright 2005 - 2010 Paul Mundt |
| 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Re-map IO memory to kernel address space so that we can access it. |
| 8 | * This is needed for high PCI addresses that aren't mapped in the |
| 9 | * 640k-1MB IO memory area on PC's |
| 10 | * |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 11 | * This file is subject to the terms and conditions of the GNU General |
| 12 | * Public License. See the file "COPYING" in the main directory of this |
| 13 | * archive for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/vmalloc.h> |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 16 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 17 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/mm.h> |
Paul Mundt | a3e61d5 | 2006-09-27 16:45:22 +0900 | [diff] [blame] | 19 | #include <linux/pci.h> |
Haavard Skinnemoen | 5b3e1a8 | 2006-12-08 02:38:07 -0800 | [diff] [blame] | 20 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/page.h> |
| 22 | #include <asm/pgalloc.h> |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 23 | #include <asm/addrspace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/cacheflush.h> |
| 25 | #include <asm/tlbflush.h> |
Paul Mundt | 0fd1475 | 2007-06-04 10:58:23 +0900 | [diff] [blame] | 26 | #include <asm/mmu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | * Remap an arbitrary physical address space into the kernel virtual |
| 30 | * address space. Needed when the kernel wants to access high addresses |
| 31 | * directly. |
| 32 | * |
| 33 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 34 | * have to convert them into an offset in a page-aligned mapping, but the |
| 35 | * caller shouldn't need to know that small detail. |
| 36 | */ |
Paul Mundt | af14153 | 2010-01-18 21:45:00 +0900 | [diff] [blame] | 37 | void __iomem * __init_refok |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 38 | __ioremap_caller(phys_addr_t phys_addr, unsigned long size, |
Paul Mundt | d57d640 | 2010-01-19 13:34:38 +0900 | [diff] [blame] | 39 | pgprot_t pgprot, void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
Paul Mundt | bf3cded | 2009-12-14 14:23:41 +0900 | [diff] [blame] | 41 | struct vm_struct *area; |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 42 | unsigned long offset, last_addr, addr, orig_addr; |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 43 | void __iomem *mapped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* Don't allow wraparound or zero size */ |
| 46 | last_addr = phys_addr + size - 1; |
| 47 | if (!size || last_addr < phys_addr) |
| 48 | return NULL; |
| 49 | |
| 50 | /* |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 51 | * If we can't yet use the regular approach, go the fixmap route. |
| 52 | */ |
| 53 | if (!mem_init_done) |
| 54 | return ioremap_fixed(phys_addr, size, pgprot); |
| 55 | |
| 56 | /* |
| 57 | * First try to remap through the PMB. |
| 58 | * PMB entries are all pre-faulted. |
| 59 | */ |
| 60 | mapped = pmb_remap_caller(phys_addr, size, pgprot, caller); |
| 61 | if (mapped && !IS_ERR(mapped)) |
| 62 | return mapped; |
| 63 | |
| 64 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * Mappings have to be page-aligned |
| 66 | */ |
| 67 | offset = phys_addr & ~PAGE_MASK; |
| 68 | phys_addr &= PAGE_MASK; |
| 69 | size = PAGE_ALIGN(last_addr+1) - phys_addr; |
| 70 | |
| 71 | /* |
| 72 | * Ok, go for it.. |
| 73 | */ |
Paul Mundt | bf3cded | 2009-12-14 14:23:41 +0900 | [diff] [blame] | 74 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | if (!area) |
| 76 | return NULL; |
| 77 | area->phys_addr = phys_addr; |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 78 | orig_addr = addr = (unsigned long)area->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 80 | if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) { |
| 81 | vunmap((void *)orig_addr); |
| 82 | return NULL; |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 83 | } |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 84 | |
| 85 | return (void __iomem *)(offset + (char *)orig_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
Paul Mundt | bf3cded | 2009-12-14 14:23:41 +0900 | [diff] [blame] | 87 | EXPORT_SYMBOL(__ioremap_caller); |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 88 | |
Paul Mundt | 78bf04f | 2010-01-17 01:45:26 +0900 | [diff] [blame] | 89 | /* |
| 90 | * Simple checks for non-translatable mappings. |
| 91 | */ |
| 92 | static inline int iomapping_nontranslatable(unsigned long offset) |
| 93 | { |
| 94 | #ifdef CONFIG_29BIT |
| 95 | /* |
| 96 | * In 29-bit mode this includes the fixed P1/P2 areas, as well as |
| 97 | * parts of P3. |
| 98 | */ |
| 99 | if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX) |
| 100 | return 1; |
| 101 | #endif |
| 102 | |
Paul Mundt | 78bf04f | 2010-01-17 01:45:26 +0900 | [diff] [blame] | 103 | return 0; |
| 104 | } |
| 105 | |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 106 | void __iounmap(void __iomem *addr) |
| 107 | { |
| 108 | unsigned long vaddr = (unsigned long __force)addr; |
| 109 | struct vm_struct *p; |
| 110 | |
Paul Mundt | 78bf04f | 2010-01-17 01:45:26 +0900 | [diff] [blame] | 111 | /* |
| 112 | * Nothing to do if there is no translatable mapping. |
| 113 | */ |
| 114 | if (iomapping_nontranslatable(vaddr)) |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 115 | return; |
| 116 | |
Paul Mundt | 12b6b01 | 2010-01-18 21:33:08 +0900 | [diff] [blame] | 117 | /* |
| 118 | * There's no VMA if it's from an early fixed mapping. |
| 119 | */ |
| 120 | if (iounmap_fixed(addr) == 0) |
| 121 | return; |
| 122 | |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 123 | /* |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 124 | * If the PMB handled it, there's nothing else to do. |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 125 | */ |
Paul Mundt | 90e7d64 | 2010-02-23 16:20:53 +0900 | [diff] [blame] | 126 | if (pmb_unmap(addr) == 0) |
| 127 | return; |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 128 | |
| 129 | p = remove_vm_area((void *)(vaddr & PAGE_MASK)); |
| 130 | if (!p) { |
Harvey Harrison | 866e6b9 | 2008-03-04 15:23:47 -0800 | [diff] [blame] | 131 | printk(KERN_ERR "%s: bad address %p\n", __func__, addr); |
Paul Mundt | b66c1a3 | 2006-01-16 22:14:15 -0800 | [diff] [blame] | 132 | return; |
| 133 | } |
| 134 | |
| 135 | kfree(p); |
| 136 | } |
| 137 | EXPORT_SYMBOL(__iounmap); |