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> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 27 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Russell King | 15d07dc | 2012-03-28 18:30:01 +0100 | [diff] [blame] | 29 | #include <asm/cp15.h> |
Russell King | 0ba8b9b | 2008-08-10 18:08:10 +0100 | [diff] [blame] | 30 | #include <asm/cputype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <asm/cacheflush.h> |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 32 | #include <asm/mmu_context.h> |
| 33 | #include <asm/pgalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/tlbflush.h> |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 35 | #include <asm/sizes.h> |
David Howells | 9f97da7 | 2012-03-28 18:30:01 +0100 | [diff] [blame^] | 36 | #include <asm/system_info.h> |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 37 | |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 38 | #include <asm/mach/map.h> |
| 39 | #include "mm.h" |
| 40 | |
Hiroshi DOYU | 69d3a84 | 2009-01-28 21:32:08 +0200 | [diff] [blame] | 41 | int ioremap_page(unsigned long virt, unsigned long phys, |
| 42 | const struct mem_type *mtype) |
| 43 | { |
Russell King | d746196 | 2010-07-26 10:29:13 +0100 | [diff] [blame] | 44 | return ioremap_page_range(virt, virt + PAGE_SIZE, phys, |
| 45 | __pgprot(mtype->prot_pte)); |
Hiroshi DOYU | 69d3a84 | 2009-01-28 21:32:08 +0200 | [diff] [blame] | 46 | } |
| 47 | EXPORT_SYMBOL(ioremap_page); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 48 | |
| 49 | void __check_kvm_seq(struct mm_struct *mm) |
| 50 | { |
| 51 | unsigned int seq; |
| 52 | |
| 53 | do { |
| 54 | seq = init_mm.context.kvm_seq; |
| 55 | memcpy(pgd_offset(mm, VMALLOC_START), |
| 56 | pgd_offset_k(VMALLOC_START), |
| 57 | sizeof(pgd_t) * (pgd_index(VMALLOC_END) - |
| 58 | pgd_index(VMALLOC_START))); |
| 59 | mm->context.kvm_seq = seq; |
| 60 | } while (seq != init_mm.context.kvm_seq); |
| 61 | } |
| 62 | |
Catalin Marinas | da02877 | 2011-11-22 17:30:29 +0000 | [diff] [blame] | 63 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 64 | /* |
| 65 | * Section support is unsafe on SMP - If you iounmap and ioremap a region, |
| 66 | * the other CPUs will not see this change until their next context switch. |
| 67 | * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs |
| 68 | * which requires the new ioremap'd region to be referenced, the CPU will |
| 69 | * reference the _old_ region. |
| 70 | * |
Russell King | 31aa8fd | 2009-12-18 11:10:03 +0000 | [diff] [blame] | 71 | * Note that get_vm_area_caller() allocates a guard 4K page, so we need to |
| 72 | * mask the size back to 1MB aligned or we will overflow in the loop below. |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 73 | */ |
| 74 | static void unmap_area_sections(unsigned long virt, unsigned long size) |
| 75 | { |
Russell King | 24f11ec | 2009-01-25 17:36:34 +0000 | [diff] [blame] | 76 | unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1)); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 77 | pgd_t *pgd; |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 78 | pud_t *pud; |
| 79 | pmd_t *pmdp; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 80 | |
| 81 | flush_cache_vunmap(addr, end); |
| 82 | pgd = pgd_offset_k(addr); |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 83 | pud = pud_offset(pgd, addr); |
| 84 | pmdp = pmd_offset(pud, addr); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 85 | do { |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 86 | pmd_t pmd = *pmdp; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 87 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 88 | if (!pmd_none(pmd)) { |
| 89 | /* |
| 90 | * Clear the PMD from the page table, and |
| 91 | * increment the kvm sequence so others |
| 92 | * notice this change. |
| 93 | * |
| 94 | * Note: this is still racy on SMP machines. |
| 95 | */ |
| 96 | pmd_clear(pmdp); |
| 97 | init_mm.context.kvm_seq++; |
| 98 | |
| 99 | /* |
| 100 | * Free the page table, if there was one. |
| 101 | */ |
| 102 | if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE) |
Benjamin Herrenschmidt | 5e54197 | 2008-02-04 22:29:14 -0800 | [diff] [blame] | 103 | pte_free_kernel(&init_mm, pmd_page_vaddr(pmd)); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 104 | } |
| 105 | |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 106 | addr += PMD_SIZE; |
| 107 | pmdp += 2; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 108 | } while (addr < end); |
| 109 | |
| 110 | /* |
| 111 | * Ensure that the active_mm is up to date - we want to |
| 112 | * catch any use-after-iounmap cases. |
| 113 | */ |
| 114 | if (current->active_mm->context.kvm_seq != init_mm.context.kvm_seq) |
| 115 | __check_kvm_seq(current->active_mm); |
| 116 | |
| 117 | flush_tlb_kernel_range(virt, end); |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | remap_area_sections(unsigned long virt, unsigned long pfn, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 122 | size_t size, const struct mem_type *type) |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 123 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 124 | unsigned long addr = virt, end = virt + size; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 125 | pgd_t *pgd; |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 126 | pud_t *pud; |
| 127 | pmd_t *pmd; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * Remove and free any PTE-based mapping, and |
| 131 | * sync the current kernel mapping. |
| 132 | */ |
| 133 | unmap_area_sections(virt, size); |
| 134 | |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 135 | pgd = pgd_offset_k(addr); |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 136 | pud = pud_offset(pgd, addr); |
| 137 | pmd = pmd_offset(pud, addr); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 138 | do { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 139 | pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 140 | pfn += SZ_1M >> PAGE_SHIFT; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 141 | pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 142 | pfn += SZ_1M >> PAGE_SHIFT; |
| 143 | flush_pmd_entry(pmd); |
| 144 | |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 145 | addr += PMD_SIZE; |
| 146 | pmd += 2; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 147 | } while (addr < end); |
| 148 | |
| 149 | return 0; |
| 150 | } |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 151 | |
| 152 | static int |
| 153 | remap_area_supersections(unsigned long virt, unsigned long pfn, |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 154 | size_t size, const struct mem_type *type) |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 155 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 156 | unsigned long addr = virt, end = virt + size; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 157 | pgd_t *pgd; |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 158 | pud_t *pud; |
| 159 | pmd_t *pmd; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 160 | |
| 161 | /* |
| 162 | * Remove and free any PTE-based mapping, and |
| 163 | * sync the current kernel mapping. |
| 164 | */ |
| 165 | unmap_area_sections(virt, size); |
| 166 | |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 167 | pgd = pgd_offset_k(virt); |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 168 | pud = pud_offset(pgd, addr); |
| 169 | pmd = pmd_offset(pud, addr); |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 170 | do { |
| 171 | unsigned long super_pmd_val, i; |
| 172 | |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 173 | super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect | |
| 174 | PMD_SECT_SUPER; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 175 | super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20; |
| 176 | |
| 177 | for (i = 0; i < 8; i++) { |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 178 | pmd[0] = __pmd(super_pmd_val); |
| 179 | pmd[1] = __pmd(super_pmd_val); |
| 180 | flush_pmd_entry(pmd); |
| 181 | |
Catalin Marinas | 03a6b82 | 2011-11-22 17:30:27 +0000 | [diff] [blame] | 182 | addr += PMD_SIZE; |
| 183 | pmd += 2; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | pfn += SUPERSECTION_SIZE >> PAGE_SHIFT; |
| 187 | } while (addr < end); |
| 188 | |
| 189 | return 0; |
| 190 | } |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 191 | #endif |
| 192 | |
Russell King | 31aa8fd | 2009-12-18 11:10:03 +0000 | [diff] [blame] | 193 | void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn, |
| 194 | unsigned long offset, size_t size, unsigned int mtype, void *caller) |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 195 | { |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 196 | const struct mem_type *type; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 197 | int err; |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 198 | unsigned long addr; |
| 199 | struct vm_struct * area; |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 200 | |
Catalin Marinas | da02877 | 2011-11-22 17:30:29 +0000 | [diff] [blame] | 201 | #ifndef CONFIG_ARM_LPAE |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 202 | /* |
| 203 | * High mappings must be supersection aligned |
| 204 | */ |
| 205 | if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK)) |
| 206 | return NULL; |
Catalin Marinas | da02877 | 2011-11-22 17:30:29 +0000 | [diff] [blame] | 207 | #endif |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 208 | |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 209 | type = get_mem_type(mtype); |
| 210 | if (!type) |
| 211 | return NULL; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 212 | |
Russell King | 6d78b5f | 2007-06-03 19:26:04 +0100 | [diff] [blame] | 213 | /* |
| 214 | * Page align the mapping size, taking account of any offset. |
| 215 | */ |
| 216 | size = PAGE_ALIGN(offset + size); |
Russell King | c924aff | 2006-12-17 23:29:57 +0000 | [diff] [blame] | 217 | |
Nicolas Pitre | 576d2f2 | 2011-09-16 01:14:23 -0400 | [diff] [blame] | 218 | /* |
| 219 | * Try to reuse one of the static mapping whenever possible. |
| 220 | */ |
| 221 | read_lock(&vmlist_lock); |
| 222 | for (area = vmlist; area; area = area->next) { |
| 223 | if (!size || (sizeof(phys_addr_t) == 4 && pfn >= 0x100000)) |
| 224 | break; |
| 225 | if (!(area->flags & VM_ARM_STATIC_MAPPING)) |
| 226 | continue; |
| 227 | if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype)) |
| 228 | continue; |
| 229 | if (__phys_to_pfn(area->phys_addr) > pfn || |
Russell King | 97f1040 | 2012-01-29 14:55:21 +0000 | [diff] [blame] | 230 | __pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1) |
Nicolas Pitre | 576d2f2 | 2011-09-16 01:14:23 -0400 | [diff] [blame] | 231 | continue; |
| 232 | /* we can drop the lock here as we know *area is static */ |
| 233 | read_unlock(&vmlist_lock); |
| 234 | addr = (unsigned long)area->addr; |
| 235 | addr += __pfn_to_phys(pfn) - area->phys_addr; |
| 236 | return (void __iomem *) (offset + addr); |
| 237 | } |
| 238 | read_unlock(&vmlist_lock); |
| 239 | |
| 240 | /* |
| 241 | * Don't allow RAM to be mapped - this causes problems with ARMv6+ |
| 242 | */ |
| 243 | if (WARN_ON(pfn_valid(pfn))) |
| 244 | return NULL; |
| 245 | |
Russell King | 31aa8fd | 2009-12-18 11:10:03 +0000 | [diff] [blame] | 246 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 247 | if (!area) |
| 248 | return NULL; |
| 249 | addr = (unsigned long)area->addr; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 250 | |
Catalin Marinas | da02877 | 2011-11-22 17:30:29 +0000 | [diff] [blame] | 251 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
Catalin Marinas | 412489a | 2007-01-25 14:16:47 +0100 | [diff] [blame] | 252 | if (DOMAIN_IO == 0 && |
| 253 | (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) || |
Russell King | 4a56c1e | 2007-04-21 10:16:48 +0100 | [diff] [blame] | 254 | cpu_is_xsc3()) && pfn >= 0x100000 && |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 255 | !((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) { |
| 256 | area->flags |= VM_ARM_SECTION_MAPPING; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 257 | err = remap_area_supersections(addr, pfn, size, type); |
Lennert Buytenhek | a069c89 | 2006-07-01 19:58:20 +0100 | [diff] [blame] | 258 | } else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) { |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 259 | area->flags |= VM_ARM_SECTION_MAPPING; |
Russell King | b29e9f5 | 2007-04-21 10:47:29 +0100 | [diff] [blame] | 260 | err = remap_area_sections(addr, pfn, size, type); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 261 | } else |
| 262 | #endif |
Russell King | d746196 | 2010-07-26 10:29:13 +0100 | [diff] [blame] | 263 | err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn), |
| 264 | __pgprot(type->prot_pte)); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 265 | |
| 266 | if (err) { |
Catalin Marinas | 478922c | 2006-05-16 11:30:26 +0100 | [diff] [blame] | 267 | vunmap((void *)addr); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 268 | return NULL; |
| 269 | } |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 270 | |
| 271 | flush_cache_vmap(addr, addr + size); |
| 272 | return (void __iomem *) (offset + addr); |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 273 | } |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 274 | |
Russell King | 31aa8fd | 2009-12-18 11:10:03 +0000 | [diff] [blame] | 275 | void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size, |
| 276 | unsigned int mtype, void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | { |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 278 | unsigned long last_addr; |
| 279 | unsigned long offset = phys_addr & ~PAGE_MASK; |
| 280 | unsigned long pfn = __phys_to_pfn(phys_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Deepak Saxena | 9d4ae72 | 2006-01-09 19:23:11 +0000 | [diff] [blame] | 282 | /* |
| 283 | * Don't allow wraparound or zero size |
| 284 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | last_addr = phys_addr + size - 1; |
| 286 | if (!size || last_addr < phys_addr) |
| 287 | return NULL; |
| 288 | |
Russell King | 31aa8fd | 2009-12-18 11:10:03 +0000 | [diff] [blame] | 289 | return __arm_ioremap_pfn_caller(pfn, offset, size, mtype, |
| 290 | caller); |
| 291 | } |
| 292 | |
| 293 | /* |
| 294 | * Remap an arbitrary physical address space into the kernel virtual |
| 295 | * address space. Needed when the kernel wants to access high addresses |
| 296 | * directly. |
| 297 | * |
| 298 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 299 | * have to convert them into an offset in a page-aligned mapping, but the |
| 300 | * caller shouldn't need to know that small detail. |
| 301 | */ |
| 302 | void __iomem * |
| 303 | __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size, |
| 304 | unsigned int mtype) |
| 305 | { |
| 306 | return __arm_ioremap_pfn_caller(pfn, offset, size, mtype, |
| 307 | __builtin_return_address(0)); |
| 308 | } |
| 309 | EXPORT_SYMBOL(__arm_ioremap_pfn); |
| 310 | |
| 311 | void __iomem * |
| 312 | __arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype) |
| 313 | { |
| 314 | return __arm_ioremap_caller(phys_addr, size, mtype, |
| 315 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
Russell King | 3603ab2 | 2007-05-05 20:59:27 +0100 | [diff] [blame] | 317 | EXPORT_SYMBOL(__arm_ioremap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Tony Lindgren | 6c5482d | 2011-10-12 01:02:50 +0100 | [diff] [blame] | 319 | /* |
| 320 | * Remap an arbitrary physical address space into the kernel virtual |
| 321 | * address space as memory. Needed when the kernel wants to execute |
| 322 | * code in external memory. This is needed for reprogramming source |
| 323 | * clocks that would affect normal memory for example. Please see |
| 324 | * CONFIG_GENERIC_ALLOCATOR for allocating external memory. |
| 325 | */ |
| 326 | void __iomem * |
| 327 | __arm_ioremap_exec(unsigned long phys_addr, size_t size, bool cached) |
| 328 | { |
| 329 | unsigned int mtype; |
| 330 | |
| 331 | if (cached) |
| 332 | mtype = MT_MEMORY; |
| 333 | else |
| 334 | mtype = MT_MEMORY_NONCACHED; |
| 335 | |
| 336 | return __arm_ioremap_caller(phys_addr, size, mtype, |
| 337 | __builtin_return_address(0)); |
| 338 | } |
| 339 | |
Russell King | 09d9bae | 2008-09-05 14:08:44 +0100 | [diff] [blame] | 340 | void __iounmap(volatile void __iomem *io_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | { |
Russell King | 09d9bae | 2008-09-05 14:08:44 +0100 | [diff] [blame] | 342 | void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); |
Nicolas Pitre | 6ee723a | 2011-09-15 22:12:19 -0400 | [diff] [blame] | 343 | struct vm_struct *vm; |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 344 | |
Nicolas Pitre | 6ee723a | 2011-09-15 22:12:19 -0400 | [diff] [blame] | 345 | read_lock(&vmlist_lock); |
| 346 | for (vm = vmlist; vm; vm = vm->next) { |
Nicolas Pitre | 576d2f2 | 2011-09-16 01:14:23 -0400 | [diff] [blame] | 347 | if (vm->addr > addr) |
| 348 | break; |
| 349 | if (!(vm->flags & VM_IOREMAP)) |
| 350 | continue; |
| 351 | /* If this is a static mapping we must leave it alone */ |
| 352 | if ((vm->flags & VM_ARM_STATIC_MAPPING) && |
| 353 | (vm->addr <= addr) && (vm->addr + vm->size > addr)) { |
| 354 | read_unlock(&vmlist_lock); |
| 355 | return; |
| 356 | } |
Russell King | 6ae25a5 | 2011-12-08 18:02:04 +0000 | [diff] [blame] | 357 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
Nicolas Pitre | 576d2f2 | 2011-09-16 01:14:23 -0400 | [diff] [blame] | 358 | /* |
| 359 | * If this is a section based mapping we need to handle it |
| 360 | * specially as the VM subsystem does not know how to handle |
| 361 | * such a beast. |
| 362 | */ |
| 363 | if ((vm->addr == addr) && |
| 364 | (vm->flags & VM_ARM_SECTION_MAPPING)) { |
| 365 | unmap_area_sections((unsigned long)vm->addr, vm->size); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 366 | break; |
| 367 | } |
Nicolas Pitre | 576d2f2 | 2011-09-16 01:14:23 -0400 | [diff] [blame] | 368 | #endif |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 369 | } |
Nicolas Pitre | 6ee723a | 2011-09-15 22:12:19 -0400 | [diff] [blame] | 370 | read_unlock(&vmlist_lock); |
Russell King | ff0daca | 2006-06-29 20:17:15 +0100 | [diff] [blame] | 371 | |
Russell King | 24f11ec | 2009-01-25 17:36:34 +0000 | [diff] [blame] | 372 | vunmap(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | EXPORT_SYMBOL(__iounmap); |