Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/ioremap.c |
| 3 | * |
| 4 | * Re-map IO memory to kernel address space so that we can access it. |
| 5 | * |
| 6 | * (C) Copyright 1995 1996 Linus Torvalds |
| 7 | * |
| 8 | * Hacked for ARM by Phil Blundell <philb@gnu.org> |
| 9 | * Hacked to allow all architectures to build, and various cleanups |
| 10 | * by Russell King |
| 11 | * |
| 12 | * This allows a driver to remap an arbitrary region of bus memory into |
| 13 | * virtual space. One should *only* use readl, writel, memcpy_toio and |
| 14 | * so on with such remapped areas. |
| 15 | * |
| 16 | * Because the ARM only has a 32-bit address space we can't address the |
| 17 | * whole of the (physical) PCI space at once. PCI huge-mode addressing |
| 18 | * allows us to circumvent this restriction by splitting PCI space into |
| 19 | * two 2GB chunks and mapping only one at a time into processor memory. |
| 20 | * We use MMU protection domains to trap any attempt to access the bank |
| 21 | * that is not currently mapped. (This isn't fully implemented yet.) |
| 22 | */ |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/vmalloc.h> |
| 27 | |
| 28 | #include <asm/cacheflush.h> |
| 29 | #include <asm/io.h> |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 30 | #include <asm/mmu_context.h> |
| 31 | #include <asm/pgalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/tlbflush.h> |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 33 | #include <asm/sizes.h> |
| 34 | |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 35 | #include <asm/mach/map.h> |
| 36 | #include "mm.h" |
| 37 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 38 | /* |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 39 | * Used by ioremap() and iounmap() code to mark (super)section-mapped |
| 40 | * I/O regions in vm_struct->flags field. |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 41 | */ |
| 42 | #define VM_ARM_SECTION_MAPPING 0x80000000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 44 | static int remap_area_pte(pmd_t *pmd, unsigned long addr, unsigned long end, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 45 | unsigned long phys_addr, const struct mem_type *type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 47 | pgprot_t prot = __pgprot(type->prot_pte); |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 48 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 50 | pte = pte_alloc_kernel(pmd, addr); |
| 51 | if (!pte) |
| 52 | return -ENOMEM; |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | do { |
| 55 | if (!pte_none(*pte)) |
| 56 | goto bad; |
| 57 | |
Russell King | c172cc9 | 2007-04-21 10:52:32 +0100 | [diff] [blame] | 58 | set_pte_ext(pte, pfn_pte(phys_addr >> PAGE_SHIFT, prot), |
| 59 | type->prot_pte_ext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | phys_addr += PAGE_SIZE; |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 61 | } while (pte++, addr += PAGE_SIZE, addr != end); |
| 62 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | bad: |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 65 | printk(KERN_CRIT "remap_area_pte: page already exists\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | BUG(); |
| 67 | } |
| 68 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 69 | static inline int remap_area_pmd(pgd_t *pgd, unsigned long addr, |
| 70 | unsigned long end, unsigned long phys_addr, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 71 | const struct mem_type *type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 73 | unsigned long next; |
| 74 | pmd_t *pmd; |
| 75 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 77 | pmd = pmd_alloc(&init_mm, pgd, addr); |
| 78 | if (!pmd) |
| 79 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | do { |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 82 | next = pmd_addr_end(addr, end); |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 83 | ret = remap_area_pte(pmd, addr, next, phys_addr, type); |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 84 | if (ret) |
| 85 | return ret; |
| 86 | phys_addr += next - addr; |
| 87 | } while (pmd++, addr = next, addr != end); |
| 88 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 91 | static int remap_area_pages(unsigned long start, unsigned long pfn, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 92 | size_t size, const struct mem_type *type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 94 | unsigned long addr = start; |
| 95 | unsigned long next, end = start + size; |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 96 | unsigned long phys_addr = __pfn_to_phys(pfn); |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 97 | pgd_t *pgd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 100 | BUG_ON(addr >= end); |
| 101 | pgd = pgd_offset_k(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | do { |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 103 | next = pgd_addr_end(addr, end); |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 104 | err = remap_area_pmd(pgd, addr, next, phys_addr, type); |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 105 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | break; |
Russell King | da2c12a | 2006-12-13 14:35:58 +0000 | [diff] [blame] | 107 | phys_addr += next - addr; |
| 108 | } while (pgd++, addr = next, addr != end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return err; |
| 111 | } |
| 112 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 113 | |
| 114 | void __check_kvm_seq(struct mm_struct *mm) |
| 115 | { |
| 116 | unsigned int seq; |
| 117 | |
| 118 | do { |
| 119 | seq = init_mm.context.kvm_seq; |
| 120 | memcpy(pgd_offset(mm, VMALLOC_START), |
| 121 | pgd_offset_k(VMALLOC_START), |
| 122 | sizeof(pgd_t) * (pgd_index(VMALLOC_END) - |
| 123 | pgd_index(VMALLOC_START))); |
| 124 | mm->context.kvm_seq = seq; |
| 125 | } while (seq != init_mm.context.kvm_seq); |
| 126 | } |
| 127 | |
| 128 | #ifndef CONFIG_SMP |
| 129 | /* |
| 130 | * Section support is unsafe on SMP - If you iounmap and ioremap a region, |
| 131 | * the other CPUs will not see this change until their next context switch. |
| 132 | * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs |
| 133 | * which requires the new ioremap'd region to be referenced, the CPU will |
| 134 | * reference the _old_ region. |
| 135 | * |
| 136 | * Note that get_vm_area() allocates a guard 4K page, so we need to mask |
| 137 | * the size back to 1MB aligned or we will overflow in the loop below. |
| 138 | */ |
| 139 | static void unmap_area_sections(unsigned long virt, unsigned long size) |
| 140 | { |
| 141 | unsigned long addr = virt, end = virt + (size & ~SZ_1M); |
| 142 | pgd_t *pgd; |
| 143 | |
| 144 | flush_cache_vunmap(addr, end); |
| 145 | pgd = pgd_offset_k(addr); |
| 146 | do { |
| 147 | pmd_t pmd, *pmdp = pmd_offset(pgd, addr); |
| 148 | |
| 149 | pmd = *pmdp; |
| 150 | if (!pmd_none(pmd)) { |
| 151 | /* |
| 152 | * Clear the PMD from the page table, and |
| 153 | * increment the kvm sequence so others |
| 154 | * notice this change. |
| 155 | * |
| 156 | * Note: this is still racy on SMP machines. |
| 157 | */ |
| 158 | pmd_clear(pmdp); |
| 159 | init_mm.context.kvm_seq++; |
| 160 | |
| 161 | /* |
| 162 | * Free the page table, if there was one. |
| 163 | */ |
| 164 | if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE) |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 165 | pte_free_kernel(pmd_page_vaddr(pmd)); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | addr += PGDIR_SIZE; |
| 169 | pgd++; |
| 170 | } while (addr < end); |
| 171 | |
| 172 | /* |
| 173 | * Ensure that the active_mm is up to date - we want to |
| 174 | * catch any use-after-iounmap cases. |
| 175 | */ |
| 176 | if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq) |
| 177 | __check_kvm_seq(current->active_mm); |
| 178 | |
| 179 | flush_tlb_kernel_range(virt, end); |
| 180 | } |
| 181 | |
| 182 | static int |
| 183 | remap_area_sections(unsigned long virt, unsigned long pfn, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 184 | size_t size, const struct mem_type *type) |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 185 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 186 | unsigned long addr = virt, end = virt + size; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 187 | pgd_t *pgd; |
| 188 | |
| 189 | /* |
| 190 | * Remove and free any PTE-based mapping, and |
| 191 | * sync the current kernel mapping. |
| 192 | */ |
| 193 | unmap_area_sections(virt, size); |
| 194 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 195 | pgd = pgd_offset_k(addr); |
| 196 | do { |
| 197 | pmd_t *pmd = pmd_offset(pgd, addr); |
| 198 | |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 199 | pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 200 | pfn += SZ_1M >> PAGE_SHIFT; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 201 | pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 202 | pfn += SZ_1M >> PAGE_SHIFT; |
| 203 | flush_pmd_entry(pmd); |
| 204 | |
| 205 | addr += PGDIR_SIZE; |
| 206 | pgd++; |
| 207 | } while (addr < end); |
| 208 | |
| 209 | return 0; |
| 210 | } |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 211 | |
| 212 | static int |
| 213 | remap_area_supersections(unsigned long virt, unsigned long pfn, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 214 | size_t size, const struct mem_type *type) |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 215 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 216 | unsigned long addr = virt, end = virt + size; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 217 | pgd_t *pgd; |
| 218 | |
| 219 | /* |
| 220 | * Remove and free any PTE-based mapping, and |
| 221 | * sync the current kernel mapping. |
| 222 | */ |
| 223 | unmap_area_sections(virt, size); |
| 224 | |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 225 | pgd = pgd_offset_k(virt); |
| 226 | do { |
| 227 | unsigned long super_pmd_val, i; |
| 228 | |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 229 | super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect | |
| 230 | PMD_SECT_SUPER; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 231 | super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20; |
| 232 | |
| 233 | for (i = 0; i < 8; i++) { |
| 234 | pmd_t *pmd = pmd_offset(pgd, addr); |
| 235 | |
| 236 | pmd[0] = __pmd(super_pmd_val); |
| 237 | pmd[1] = __pmd(super_pmd_val); |
| 238 | flush_pmd_entry(pmd); |
| 239 | |
| 240 | addr += PGDIR_SIZE; |
| 241 | pgd++; |
| 242 | } |
| 243 | |
| 244 | pfn += SUPERSECTION_SIZE >> PAGE_SHIFT; |
| 245 | } while (addr < end); |
| 246 | |
| 247 | return 0; |
| 248 | } |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 249 | #endif |
| 250 | |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | /* |
| 253 | * Remap an arbitrary physical address space into the kernel virtual |
| 254 | * address space. Needed when the kernel wants to access high addresses |
| 255 | * directly. |
| 256 | * |
| 257 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 258 | * have to convert them into an offset in a page-aligned mapping, but the |
| 259 | * caller shouldn't need to know that small detail. |
| 260 | * |
| 261 | * 'flags' are the extra L_PTE_ flags that you want to specify for this |
| 262 | * mapping. See include/asm-arm/proc-armv/pgtable.h for more information. |
| 263 | */ |
| 264 | void __iomem * |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 265 | __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size, |
| 266 | unsigned int mtype) |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 267 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 268 | const struct mem_type *type; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 269 | int err; |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 270 | unsigned long addr; |
| 271 | struct vm_struct * area; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 272 | |
| 273 | /* |
| 274 | * High mappings must be supersection aligned |
| 275 | */ |
| 276 | if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK)) |
| 277 | return NULL; |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 278 | |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 279 | type = get_mem_type(mtype); |
| 280 | if (!type) |
| 281 | return NULL; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 282 | |
Russell King | 6d78b5f | 2007-06-03 19:26:04 +0100 | [diff] [blame] | 283 | /* |
| 284 | * Page align the mapping size, taking account of any offset. |
| 285 | */ |
| 286 | size = PAGE_ALIGN(offset + size); |
Russell King | c924aff | 2006-12-17 23:29:57 +0000 | [diff] [blame] | 287 | |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 288 | area = get_vm_area(size, VM_IOREMAP); |
| 289 | if (!area) |
| 290 | return NULL; |
| 291 | addr = (unsigned long)area->addr; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 292 | |
| 293 | #ifndef CONFIG_SMP |
Catalin Marinas | 412489a | 2007-01-25 14:16:47 +0100 | [diff] [blame] | 294 | if (DOMAIN_IO == 0 && |
| 295 | (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) || |
Russell King | 4a56c1e | 2007-04-21 10:16:48 +0100 | [diff] [blame] | 296 | cpu_is_xsc3()) && pfn >= 0x100000 && |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 297 | !((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) { |
| 298 | area->flags |= VM_ARM_SECTION_MAPPING; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 299 | err = remap_area_supersections(addr, pfn, size, type); |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 300 | } else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) { |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 301 | area->flags |= VM_ARM_SECTION_MAPPING; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 302 | err = remap_area_sections(addr, pfn, size, type); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 303 | } else |
| 304 | #endif |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 305 | err = remap_area_pages(addr, pfn, size, type); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 306 | |
| 307 | if (err) { |
Catalin Marinas | 478922c | 2006-05-16 11:30:26 +0100 | [diff] [blame] | 308 | vunmap((void *)addr); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 309 | return NULL; |
| 310 | } |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 311 | |
| 312 | flush_cache_vmap(addr, addr + size); |
| 313 | return (void __iomem *) (offset + addr); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 314 | } |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 315 | EXPORT_SYMBOL(__arm_ioremap_pfn); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 316 | |
| 317 | void __iomem * |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 318 | __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 320 | unsigned long last_addr; |
| 321 | unsigned long offset = phys_addr & ~PAGE_MASK; |
| 322 | unsigned long pfn = __phys_to_pfn(phys_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 324 | /* |
| 325 | * Don't allow wraparound or zero size |
| 326 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | last_addr = phys_addr + size - 1; |
| 328 | if (!size || last_addr < phys_addr) |
| 329 | return NULL; |
| 330 | |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 331 | return __arm_ioremap_pfn(pfn, offset, size, mtype); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | } |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 333 | EXPORT_SYMBOL(__arm_ioremap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Al Viro | 1622605 | 2006-10-09 02:09:49 +0100 | [diff] [blame] | 335 | void __iounmap(volatile void __iomem *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
Catalin Marinas | ceaccbd | 2006-07-29 08:29:30 +0100 | [diff] [blame] | 337 | #ifndef CONFIG_SMP |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 338 | struct vm_struct **p, *tmp; |
Catalin Marinas | ceaccbd | 2006-07-29 08:29:30 +0100 | [diff] [blame] | 339 | #endif |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 340 | unsigned int section_mapping = 0; |
| 341 | |
Al Viro | 1622605 | 2006-10-09 02:09:49 +0100 | [diff] [blame] | 342 | addr = (volatile void __iomem *)(PAGE_MASK & (unsigned long)addr); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 343 | |
Lennert Buytenhek | 7cddc39 | 2006-07-03 12:26:02 +0100 | [diff] [blame] | 344 | #ifndef CONFIG_SMP |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 345 | /* |
| 346 | * If this is a section based mapping we need to handle it |
Simon Arlott | 6cbdc8c | 2007-05-11 20:40:30 +0100 | [diff] [blame] | 347 | * specially as the VM subsystem does not know how to handle |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 348 | * such a beast. We need the lock here b/c we need to clear |
| 349 | * all the mappings before the area can be reclaimed |
| 350 | * by someone else. |
| 351 | */ |
| 352 | write_lock(&vmlist_lock); |
| 353 | for (p = &vmlist ; (tmp = *p) ; p = &tmp->next) { |
| 354 | if((tmp->flags & VM_IOREMAP) && (tmp->addr == addr)) { |
| 355 | if (tmp->flags & VM_ARM_SECTION_MAPPING) { |
| 356 | *p = tmp->next; |
| 357 | unmap_area_sections((unsigned long)tmp->addr, |
| 358 | tmp->size); |
| 359 | kfree(tmp); |
| 360 | section_mapping = 1; |
| 361 | } |
| 362 | break; |
| 363 | } |
| 364 | } |
| 365 | write_unlock(&vmlist_lock); |
Lennert Buytenhek | 7cddc39 | 2006-07-03 12:26:02 +0100 | [diff] [blame] | 366 | #endif |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 367 | |
| 368 | if (!section_mapping) |
Al Viro | 1622605 | 2006-10-09 02:09:49 +0100 | [diff] [blame] | 369 | vunmap((void __force *)addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | EXPORT_SYMBOL(__iounmap); |