Commit | Line | Data |
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1da177e4 LT |
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> | |
fced80c7 | 27 | #include <linux/io.h> |
158e8bfe | 28 | #include <linux/sizes.h> |
1da177e4 | 29 | |
15d07dc9 | 30 | #include <asm/cp15.h> |
0ba8b9b2 | 31 | #include <asm/cputype.h> |
1da177e4 | 32 | #include <asm/cacheflush.h> |
2937367b | 33 | #include <asm/early_ioremap.h> |
ff0daca5 RK |
34 | #include <asm/mmu_context.h> |
35 | #include <asm/pgalloc.h> | |
1da177e4 | 36 | #include <asm/tlbflush.h> |
9f97da78 | 37 | #include <asm/system_info.h> |
ff0daca5 | 38 | |
b29e9f5e | 39 | #include <asm/mach/map.h> |
c2794437 | 40 | #include <asm/mach/pci.h> |
b29e9f5e RK |
41 | #include "mm.h" |
42 | ||
ed8fd218 JK |
43 | |
44 | LIST_HEAD(static_vmlist); | |
45 | ||
46 | static struct static_vm *find_static_vm_paddr(phys_addr_t paddr, | |
47 | size_t size, unsigned int mtype) | |
48 | { | |
49 | struct static_vm *svm; | |
50 | struct vm_struct *vm; | |
51 | ||
52 | list_for_each_entry(svm, &static_vmlist, list) { | |
53 | vm = &svm->vm; | |
54 | if (!(vm->flags & VM_ARM_STATIC_MAPPING)) | |
55 | continue; | |
56 | if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype)) | |
57 | continue; | |
58 | ||
59 | if (vm->phys_addr > paddr || | |
60 | paddr + size - 1 > vm->phys_addr + vm->size - 1) | |
61 | continue; | |
62 | ||
63 | return svm; | |
64 | } | |
65 | ||
66 | return NULL; | |
67 | } | |
68 | ||
69 | struct static_vm *find_static_vm_vaddr(void *vaddr) | |
70 | { | |
71 | struct static_vm *svm; | |
72 | struct vm_struct *vm; | |
73 | ||
74 | list_for_each_entry(svm, &static_vmlist, list) { | |
75 | vm = &svm->vm; | |
76 | ||
77 | /* static_vmlist is ascending order */ | |
78 | if (vm->addr > vaddr) | |
79 | break; | |
80 | ||
81 | if (vm->addr <= vaddr && vm->addr + vm->size > vaddr) | |
82 | return svm; | |
83 | } | |
84 | ||
85 | return NULL; | |
86 | } | |
87 | ||
88 | void __init add_static_vm_early(struct static_vm *svm) | |
89 | { | |
90 | struct static_vm *curr_svm; | |
91 | struct vm_struct *vm; | |
92 | void *vaddr; | |
93 | ||
94 | vm = &svm->vm; | |
95 | vm_area_add_early(vm); | |
96 | vaddr = vm->addr; | |
97 | ||
98 | list_for_each_entry(curr_svm, &static_vmlist, list) { | |
99 | vm = &curr_svm->vm; | |
100 | ||
101 | if (vm->addr > vaddr) | |
102 | break; | |
103 | } | |
104 | list_add_tail(&svm->list, &curr_svm->list); | |
105 | } | |
106 | ||
69d3a84a HD |
107 | int ioremap_page(unsigned long virt, unsigned long phys, |
108 | const struct mem_type *mtype) | |
109 | { | |
d7461963 RK |
110 | return ioremap_page_range(virt, virt + PAGE_SIZE, phys, |
111 | __pgprot(mtype->prot_pte)); | |
69d3a84a HD |
112 | } |
113 | EXPORT_SYMBOL(ioremap_page); | |
ff0daca5 | 114 | |
3e99675a | 115 | void __check_vmalloc_seq(struct mm_struct *mm) |
ff0daca5 RK |
116 | { |
117 | unsigned int seq; | |
118 | ||
119 | do { | |
3e99675a | 120 | seq = init_mm.context.vmalloc_seq; |
ff0daca5 RK |
121 | memcpy(pgd_offset(mm, VMALLOC_START), |
122 | pgd_offset_k(VMALLOC_START), | |
123 | sizeof(pgd_t) * (pgd_index(VMALLOC_END) - | |
124 | pgd_index(VMALLOC_START))); | |
3e99675a NP |
125 | mm->context.vmalloc_seq = seq; |
126 | } while (seq != init_mm.context.vmalloc_seq); | |
ff0daca5 RK |
127 | } |
128 | ||
da028779 | 129 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
ff0daca5 RK |
130 | /* |
131 | * Section support is unsafe on SMP - If you iounmap and ioremap a region, | |
132 | * the other CPUs will not see this change until their next context switch. | |
133 | * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs | |
134 | * which requires the new ioremap'd region to be referenced, the CPU will | |
135 | * reference the _old_ region. | |
136 | * | |
31aa8fd6 RK |
137 | * Note that get_vm_area_caller() allocates a guard 4K page, so we need to |
138 | * mask the size back to 1MB aligned or we will overflow in the loop below. | |
ff0daca5 RK |
139 | */ |
140 | static void unmap_area_sections(unsigned long virt, unsigned long size) | |
141 | { | |
24f11ec0 | 142 | unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1)); |
ff0daca5 | 143 | pgd_t *pgd; |
03a6b827 CM |
144 | pud_t *pud; |
145 | pmd_t *pmdp; | |
ff0daca5 RK |
146 | |
147 | flush_cache_vunmap(addr, end); | |
148 | pgd = pgd_offset_k(addr); | |
03a6b827 CM |
149 | pud = pud_offset(pgd, addr); |
150 | pmdp = pmd_offset(pud, addr); | |
ff0daca5 | 151 | do { |
03a6b827 | 152 | pmd_t pmd = *pmdp; |
ff0daca5 | 153 | |
ff0daca5 RK |
154 | if (!pmd_none(pmd)) { |
155 | /* | |
156 | * Clear the PMD from the page table, and | |
3e99675a | 157 | * increment the vmalloc sequence so others |
ff0daca5 RK |
158 | * notice this change. |
159 | * | |
160 | * Note: this is still racy on SMP machines. | |
161 | */ | |
162 | pmd_clear(pmdp); | |
3e99675a | 163 | init_mm.context.vmalloc_seq++; |
ff0daca5 RK |
164 | |
165 | /* | |
166 | * Free the page table, if there was one. | |
167 | */ | |
168 | if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE) | |
5e541973 | 169 | pte_free_kernel(&init_mm, pmd_page_vaddr(pmd)); |
ff0daca5 RK |
170 | } |
171 | ||
03a6b827 CM |
172 | addr += PMD_SIZE; |
173 | pmdp += 2; | |
ff0daca5 RK |
174 | } while (addr < end); |
175 | ||
176 | /* | |
177 | * Ensure that the active_mm is up to date - we want to | |
178 | * catch any use-after-iounmap cases. | |
179 | */ | |
3e99675a NP |
180 | if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq) |
181 | __check_vmalloc_seq(current->active_mm); | |
ff0daca5 RK |
182 | |
183 | flush_tlb_kernel_range(virt, end); | |
184 | } | |
185 | ||
186 | static int | |
187 | remap_area_sections(unsigned long virt, unsigned long pfn, | |
b29e9f5e | 188 | size_t size, const struct mem_type *type) |
ff0daca5 | 189 | { |
b29e9f5e | 190 | unsigned long addr = virt, end = virt + size; |
ff0daca5 | 191 | pgd_t *pgd; |
03a6b827 CM |
192 | pud_t *pud; |
193 | pmd_t *pmd; | |
ff0daca5 RK |
194 | |
195 | /* | |
196 | * Remove and free any PTE-based mapping, and | |
197 | * sync the current kernel mapping. | |
198 | */ | |
199 | unmap_area_sections(virt, size); | |
200 | ||
ff0daca5 | 201 | pgd = pgd_offset_k(addr); |
03a6b827 CM |
202 | pud = pud_offset(pgd, addr); |
203 | pmd = pmd_offset(pud, addr); | |
ff0daca5 | 204 | do { |
b29e9f5e | 205 | pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
ff0daca5 | 206 | pfn += SZ_1M >> PAGE_SHIFT; |
b29e9f5e | 207 | pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect); |
ff0daca5 RK |
208 | pfn += SZ_1M >> PAGE_SHIFT; |
209 | flush_pmd_entry(pmd); | |
210 | ||
03a6b827 CM |
211 | addr += PMD_SIZE; |
212 | pmd += 2; | |
ff0daca5 RK |
213 | } while (addr < end); |
214 | ||
215 | return 0; | |
216 | } | |
a069c896 LB |
217 | |
218 | static int | |
219 | remap_area_supersections(unsigned long virt, unsigned long pfn, | |
b29e9f5e | 220 | size_t size, const struct mem_type *type) |
a069c896 | 221 | { |
b29e9f5e | 222 | unsigned long addr = virt, end = virt + size; |
a069c896 | 223 | pgd_t *pgd; |
03a6b827 CM |
224 | pud_t *pud; |
225 | pmd_t *pmd; | |
a069c896 LB |
226 | |
227 | /* | |
228 | * Remove and free any PTE-based mapping, and | |
229 | * sync the current kernel mapping. | |
230 | */ | |
231 | unmap_area_sections(virt, size); | |
232 | ||
a069c896 | 233 | pgd = pgd_offset_k(virt); |
03a6b827 CM |
234 | pud = pud_offset(pgd, addr); |
235 | pmd = pmd_offset(pud, addr); | |
a069c896 LB |
236 | do { |
237 | unsigned long super_pmd_val, i; | |
238 | ||
b29e9f5e RK |
239 | super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect | |
240 | PMD_SECT_SUPER; | |
a069c896 LB |
241 | super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20; |
242 | ||
243 | for (i = 0; i < 8; i++) { | |
a069c896 LB |
244 | pmd[0] = __pmd(super_pmd_val); |
245 | pmd[1] = __pmd(super_pmd_val); | |
246 | flush_pmd_entry(pmd); | |
247 | ||
03a6b827 CM |
248 | addr += PMD_SIZE; |
249 | pmd += 2; | |
a069c896 LB |
250 | } |
251 | ||
252 | pfn += SUPERSECTION_SIZE >> PAGE_SHIFT; | |
253 | } while (addr < end); | |
254 | ||
255 | return 0; | |
256 | } | |
ff0daca5 RK |
257 | #endif |
258 | ||
20a1080d | 259 | static void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn, |
31aa8fd6 | 260 | unsigned long offset, size_t size, unsigned int mtype, void *caller) |
9d4ae727 | 261 | { |
b29e9f5e | 262 | const struct mem_type *type; |
ff0daca5 | 263 | int err; |
9d4ae727 | 264 | unsigned long addr; |
101eeda3 JK |
265 | struct vm_struct *area; |
266 | phys_addr_t paddr = __pfn_to_phys(pfn); | |
a069c896 | 267 | |
da028779 | 268 | #ifndef CONFIG_ARM_LPAE |
a069c896 LB |
269 | /* |
270 | * High mappings must be supersection aligned | |
271 | */ | |
101eeda3 | 272 | if (pfn >= 0x100000 && (paddr & ~SUPERSECTION_MASK)) |
a069c896 | 273 | return NULL; |
da028779 | 274 | #endif |
9d4ae727 | 275 | |
3603ab2b RK |
276 | type = get_mem_type(mtype); |
277 | if (!type) | |
278 | return NULL; | |
b29e9f5e | 279 | |
6d78b5f9 RK |
280 | /* |
281 | * Page align the mapping size, taking account of any offset. | |
282 | */ | |
283 | size = PAGE_ALIGN(offset + size); | |
c924aff8 | 284 | |
576d2f25 NP |
285 | /* |
286 | * Try to reuse one of the static mapping whenever possible. | |
287 | */ | |
101eeda3 JK |
288 | if (size && !(sizeof(phys_addr_t) == 4 && pfn >= 0x100000)) { |
289 | struct static_vm *svm; | |
290 | ||
291 | svm = find_static_vm_paddr(paddr, size, mtype); | |
292 | if (svm) { | |
293 | addr = (unsigned long)svm->vm.addr; | |
294 | addr += paddr - svm->vm.phys_addr; | |
295 | return (void __iomem *) (offset + addr); | |
296 | } | |
576d2f25 | 297 | } |
576d2f25 NP |
298 | |
299 | /* | |
9ab9e4fc AB |
300 | * Don't allow RAM to be mapped with mismatched attributes - this |
301 | * causes problems with ARMv6+ | |
576d2f25 | 302 | */ |
9ab9e4fc | 303 | if (WARN_ON(pfn_valid(pfn) && mtype != MT_MEMORY_RW)) |
576d2f25 NP |
304 | return NULL; |
305 | ||
31aa8fd6 | 306 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
9d4ae727 DS |
307 | if (!area) |
308 | return NULL; | |
309 | addr = (unsigned long)area->addr; | |
101eeda3 | 310 | area->phys_addr = paddr; |
ff0daca5 | 311 | |
da028779 | 312 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
412489af CM |
313 | if (DOMAIN_IO == 0 && |
314 | (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) || | |
4a56c1e4 | 315 | cpu_is_xsc3()) && pfn >= 0x100000 && |
101eeda3 | 316 | !((paddr | size | addr) & ~SUPERSECTION_MASK)) { |
a069c896 | 317 | area->flags |= VM_ARM_SECTION_MAPPING; |
b29e9f5e | 318 | err = remap_area_supersections(addr, pfn, size, type); |
101eeda3 | 319 | } else if (!((paddr | size | addr) & ~PMD_MASK)) { |
ff0daca5 | 320 | area->flags |= VM_ARM_SECTION_MAPPING; |
b29e9f5e | 321 | err = remap_area_sections(addr, pfn, size, type); |
ff0daca5 RK |
322 | } else |
323 | #endif | |
101eeda3 | 324 | err = ioremap_page_range(addr, addr + size, paddr, |
d7461963 | 325 | __pgprot(type->prot_pte)); |
ff0daca5 RK |
326 | |
327 | if (err) { | |
478922c2 | 328 | vunmap((void *)addr); |
9d4ae727 DS |
329 | return NULL; |
330 | } | |
ff0daca5 RK |
331 | |
332 | flush_cache_vmap(addr, addr + size); | |
333 | return (void __iomem *) (offset + addr); | |
9d4ae727 | 334 | } |
9d4ae727 | 335 | |
9b97173e | 336 | void __iomem *__arm_ioremap_caller(phys_addr_t phys_addr, size_t size, |
31aa8fd6 | 337 | unsigned int mtype, void *caller) |
1da177e4 | 338 | { |
9b97173e | 339 | phys_addr_t last_addr; |
9d4ae727 DS |
340 | unsigned long offset = phys_addr & ~PAGE_MASK; |
341 | unsigned long pfn = __phys_to_pfn(phys_addr); | |
1da177e4 | 342 | |
9d4ae727 DS |
343 | /* |
344 | * Don't allow wraparound or zero size | |
345 | */ | |
1da177e4 LT |
346 | last_addr = phys_addr + size - 1; |
347 | if (!size || last_addr < phys_addr) | |
348 | return NULL; | |
349 | ||
31aa8fd6 RK |
350 | return __arm_ioremap_pfn_caller(pfn, offset, size, mtype, |
351 | caller); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Remap an arbitrary physical address space into the kernel virtual | |
356 | * address space. Needed when the kernel wants to access high addresses | |
357 | * directly. | |
358 | * | |
359 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
360 | * have to convert them into an offset in a page-aligned mapping, but the | |
361 | * caller shouldn't need to know that small detail. | |
362 | */ | |
363 | void __iomem * | |
364 | __arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size, | |
365 | unsigned int mtype) | |
366 | { | |
367 | return __arm_ioremap_pfn_caller(pfn, offset, size, mtype, | |
20a1080d | 368 | __builtin_return_address(0)); |
31aa8fd6 RK |
369 | } |
370 | EXPORT_SYMBOL(__arm_ioremap_pfn); | |
371 | ||
9b97173e | 372 | void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t, |
4fe7ef3a RH |
373 | unsigned int, void *) = |
374 | __arm_ioremap_caller; | |
375 | ||
20a1080d RK |
376 | void __iomem *ioremap(resource_size_t res_cookie, size_t size) |
377 | { | |
378 | return arch_ioremap_caller(res_cookie, size, MT_DEVICE, | |
379 | __builtin_return_address(0)); | |
380 | } | |
381 | EXPORT_SYMBOL(ioremap); | |
382 | ||
383 | void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size) | |
20c5ea4f AB |
384 | __alias(ioremap_cached); |
385 | ||
386 | void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size) | |
20a1080d RK |
387 | { |
388 | return arch_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED, | |
389 | __builtin_return_address(0)); | |
390 | } | |
391 | EXPORT_SYMBOL(ioremap_cache); | |
20c5ea4f | 392 | EXPORT_SYMBOL(ioremap_cached); |
20a1080d RK |
393 | |
394 | void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size) | |
31aa8fd6 | 395 | { |
20a1080d RK |
396 | return arch_ioremap_caller(res_cookie, size, MT_DEVICE_WC, |
397 | __builtin_return_address(0)); | |
1da177e4 | 398 | } |
20a1080d | 399 | EXPORT_SYMBOL(ioremap_wc); |
1da177e4 | 400 | |
6c5482d5 TL |
401 | /* |
402 | * Remap an arbitrary physical address space into the kernel virtual | |
403 | * address space as memory. Needed when the kernel wants to execute | |
404 | * code in external memory. This is needed for reprogramming source | |
405 | * clocks that would affect normal memory for example. Please see | |
406 | * CONFIG_GENERIC_ALLOCATOR for allocating external memory. | |
407 | */ | |
408 | void __iomem * | |
9b97173e | 409 | __arm_ioremap_exec(phys_addr_t phys_addr, size_t size, bool cached) |
6c5482d5 TL |
410 | { |
411 | unsigned int mtype; | |
412 | ||
413 | if (cached) | |
2e2c9de2 | 414 | mtype = MT_MEMORY_RWX; |
6c5482d5 | 415 | else |
2e2c9de2 | 416 | mtype = MT_MEMORY_RWX_NONCACHED; |
6c5482d5 TL |
417 | |
418 | return __arm_ioremap_caller(phys_addr, size, mtype, | |
419 | __builtin_return_address(0)); | |
420 | } | |
421 | ||
9ab9e4fc AB |
422 | void *arch_memremap_wb(phys_addr_t phys_addr, size_t size) |
423 | { | |
424 | return (__force void *)arch_ioremap_caller(phys_addr, size, | |
425 | MT_MEMORY_RW, | |
426 | __builtin_return_address(0)); | |
427 | } | |
428 | ||
09d9bae0 | 429 | void __iounmap(volatile void __iomem *io_addr) |
1da177e4 | 430 | { |
09d9bae0 | 431 | void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr); |
101eeda3 JK |
432 | struct static_vm *svm; |
433 | ||
434 | /* If this is a static mapping, we must leave it alone */ | |
435 | svm = find_static_vm_vaddr(addr); | |
436 | if (svm) | |
437 | return; | |
ff0daca5 | 438 | |
6ae25a5b | 439 | #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE) |
101eeda3 JK |
440 | { |
441 | struct vm_struct *vm; | |
442 | ||
443 | vm = find_vm_area(addr); | |
444 | ||
576d2f25 NP |
445 | /* |
446 | * If this is a section based mapping we need to handle it | |
447 | * specially as the VM subsystem does not know how to handle | |
448 | * such a beast. | |
449 | */ | |
101eeda3 | 450 | if (vm && (vm->flags & VM_ARM_SECTION_MAPPING)) |
576d2f25 | 451 | unmap_area_sections((unsigned long)vm->addr, vm->size); |
ff0daca5 | 452 | } |
101eeda3 | 453 | #endif |
ff0daca5 | 454 | |
24f11ec0 | 455 | vunmap(addr); |
1da177e4 | 456 | } |
4fe7ef3a RH |
457 | |
458 | void (*arch_iounmap)(volatile void __iomem *) = __iounmap; | |
459 | ||
20a1080d | 460 | void iounmap(volatile void __iomem *cookie) |
4fe7ef3a | 461 | { |
20a1080d | 462 | arch_iounmap(cookie); |
4fe7ef3a | 463 | } |
20a1080d | 464 | EXPORT_SYMBOL(iounmap); |
c2794437 RH |
465 | |
466 | #ifdef CONFIG_PCI | |
1c8c3cf0 TP |
467 | static int pci_ioremap_mem_type = MT_DEVICE; |
468 | ||
469 | void pci_ioremap_set_mem_type(int mem_type) | |
470 | { | |
471 | pci_ioremap_mem_type = mem_type; | |
472 | } | |
473 | ||
c2794437 RH |
474 | int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr) |
475 | { | |
476 | BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT); | |
477 | ||
478 | return ioremap_page_range(PCI_IO_VIRT_BASE + offset, | |
479 | PCI_IO_VIRT_BASE + offset + SZ_64K, | |
480 | phys_addr, | |
1c8c3cf0 | 481 | __pgprot(get_mem_type(pci_ioremap_mem_type)->prot_pte)); |
c2794437 RH |
482 | } |
483 | EXPORT_SYMBOL_GPL(pci_ioremap_io); | |
484 | #endif | |
2937367b AB |
485 | |
486 | /* | |
487 | * Must be called after early_fixmap_init | |
488 | */ | |
489 | void __init early_ioremap_init(void) | |
490 | { | |
491 | early_ioremap_setup(); | |
492 | } |