Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mm/ioremap.c
4 *
5 * Re-map IO memory to kernel address space so that we can access it.
6 *
7 * (C) Copyright 1995 1996 Linus Torvalds
8 *
9 * Hacked for ARM by Phil Blundell <philb@gnu.org>
10 * Hacked to allow all architectures to build, and various cleanups
11 * by Russell King
12 *
13 * This allows a driver to remap an arbitrary region of bus memory into
14 * virtual space. One should *only* use readl, writel, memcpy_toio and
15 * so on with such remapped areas.
16 *
17 * Because the ARM only has a 32-bit address space we can't address the
18 * whole of the (physical) PCI space at once. PCI huge-mode addressing
19 * allows us to circumvent this restriction by splitting PCI space into
20 * two 2GB chunks and mapping only one at a time into processor memory.
21 * We use MMU protection domains to trap any attempt to access the bank
22 * that is not currently mapped. (This isn't fully implemented yet.)
23 */
24#include <linux/module.h>
25#include <linux/errno.h>
26#include <linux/kasan.h>
27#include <linux/mm.h>
28#include <linux/vmalloc.h>
29#include <linux/io.h>
30#include <linux/sizes.h>
31#include <linux/memblock.h>
32
33#include <asm/cp15.h>
34#include <asm/cputype.h>
35#include <asm/cacheflush.h>
36#include <asm/early_ioremap.h>
37#include <asm/mmu_context.h>
38#include <asm/pgalloc.h>
39#include <asm/tlbflush.h>
40#include <asm/set_memory.h>
41#include <asm/system_info.h>
42
43#include <asm/mach/map.h>
44#include <asm/mach/pci.h>
45#include "mm.h"
46
47
48LIST_HEAD(static_vmlist);
49
50static struct static_vm *find_static_vm_paddr(phys_addr_t paddr,
51 size_t size, unsigned int mtype)
52{
53 struct static_vm *svm;
54 struct vm_struct *vm;
55
56 list_for_each_entry(svm, &static_vmlist, list) {
57 vm = &svm->vm;
58 if (!(vm->flags & VM_ARM_STATIC_MAPPING))
59 continue;
60 if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
61 continue;
62
63 if (vm->phys_addr > paddr ||
64 paddr + size - 1 > vm->phys_addr + vm->size - 1)
65 continue;
66
67 return svm;
68 }
69
70 return NULL;
71}
72
73struct static_vm *find_static_vm_vaddr(void *vaddr)
74{
75 struct static_vm *svm;
76 struct vm_struct *vm;
77
78 list_for_each_entry(svm, &static_vmlist, list) {
79 vm = &svm->vm;
80
81 /* static_vmlist is ascending order */
82 if (vm->addr > vaddr)
83 break;
84
85 if (vm->addr <= vaddr && vm->addr + vm->size > vaddr)
86 return svm;
87 }
88
89 return NULL;
90}
91
92void __init add_static_vm_early(struct static_vm *svm)
93{
94 struct static_vm *curr_svm;
95 struct vm_struct *vm;
96 void *vaddr;
97
98 vm = &svm->vm;
99 vm_area_add_early(vm);
100 vaddr = vm->addr;
101
102 list_for_each_entry(curr_svm, &static_vmlist, list) {
103 vm = &curr_svm->vm;
104
105 if (vm->addr > vaddr)
106 break;
107 }
108 list_add_tail(&svm->list, &curr_svm->list);
109}
110
111int ioremap_page(unsigned long virt, unsigned long phys,
112 const struct mem_type *mtype)
113{
114 return vmap_page_range(virt, virt + PAGE_SIZE, phys,
115 __pgprot(mtype->prot_pte));
116}
117EXPORT_SYMBOL(ioremap_page);
118
119#ifdef CONFIG_KASAN
120static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
121{
122 return (unsigned long)kasan_mem_to_shadow((void *)addr);
123}
124#else
125static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
126{
127 return 0;
128}
129#endif
130
131static void memcpy_pgd(struct mm_struct *mm, unsigned long start,
132 unsigned long end)
133{
134 end = ALIGN(end, PGDIR_SIZE);
135 memcpy(pgd_offset(mm, start), pgd_offset_k(start),
136 sizeof(pgd_t) * (pgd_index(end) - pgd_index(start)));
137}
138
139void __check_vmalloc_seq(struct mm_struct *mm)
140{
141 int seq;
142
143 do {
144 seq = atomic_read_acquire(&init_mm.context.vmalloc_seq);
145 memcpy_pgd(mm, VMALLOC_START, VMALLOC_END);
146 if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
147 unsigned long start =
148 arm_kasan_mem_to_shadow(VMALLOC_START);
149 unsigned long end =
150 arm_kasan_mem_to_shadow(VMALLOC_END);
151 memcpy_pgd(mm, start, end);
152 }
153 /*
154 * Use a store-release so that other CPUs that observe the
155 * counter's new value are guaranteed to see the results of the
156 * memcpy as well.
157 */
158 atomic_set_release(&mm->context.vmalloc_seq, seq);
159 } while (seq != atomic_read(&init_mm.context.vmalloc_seq));
160}
161
162#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
163/*
164 * Section support is unsafe on SMP - If you iounmap and ioremap a region,
165 * the other CPUs will not see this change until their next context switch.
166 * Meanwhile, (eg) if an interrupt comes in on one of those other CPUs
167 * which requires the new ioremap'd region to be referenced, the CPU will
168 * reference the _old_ region.
169 *
170 * Note that get_vm_area_caller() allocates a guard 4K page, so we need to
171 * mask the size back to 1MB aligned or we will overflow in the loop below.
172 */
173static void unmap_area_sections(unsigned long virt, unsigned long size)
174{
175 unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
176 pmd_t *pmdp = pmd_off_k(addr);
177
178 do {
179 pmd_t pmd = *pmdp;
180
181 if (!pmd_none(pmd)) {
182 /*
183 * Clear the PMD from the page table, and
184 * increment the vmalloc sequence so others
185 * notice this change.
186 *
187 * Note: this is still racy on SMP machines.
188 */
189 pmd_clear(pmdp);
190 atomic_inc_return_release(&init_mm.context.vmalloc_seq);
191
192 /*
193 * Free the page table, if there was one.
194 */
195 if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
196 pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
197 }
198
199 addr += PMD_SIZE;
200 pmdp += 2;
201 } while (addr < end);
202
203 /*
204 * Ensure that the active_mm is up to date - we want to
205 * catch any use-after-iounmap cases.
206 */
207 check_vmalloc_seq(current->active_mm);
208
209 flush_tlb_kernel_range(virt, end);
210}
211
212static int
213remap_area_sections(unsigned long virt, unsigned long pfn,
214 size_t size, const struct mem_type *type)
215{
216 unsigned long addr = virt, end = virt + size;
217 pmd_t *pmd = pmd_off_k(addr);
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
225 do {
226 pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
227 pfn += SZ_1M >> PAGE_SHIFT;
228 pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
229 pfn += SZ_1M >> PAGE_SHIFT;
230 flush_pmd_entry(pmd);
231
232 addr += PMD_SIZE;
233 pmd += 2;
234 } while (addr < end);
235
236 return 0;
237}
238
239static int
240remap_area_supersections(unsigned long virt, unsigned long pfn,
241 size_t size, const struct mem_type *type)
242{
243 unsigned long addr = virt, end = virt + size;
244 pmd_t *pmd = pmd_off_k(addr);
245
246 /*
247 * Remove and free any PTE-based mapping, and
248 * sync the current kernel mapping.
249 */
250 unmap_area_sections(virt, size);
251 do {
252 unsigned long super_pmd_val, i;
253
254 super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
255 PMD_SECT_SUPER;
256 super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
257
258 for (i = 0; i < 8; i++) {
259 pmd[0] = __pmd(super_pmd_val);
260 pmd[1] = __pmd(super_pmd_val);
261 flush_pmd_entry(pmd);
262
263 addr += PMD_SIZE;
264 pmd += 2;
265 }
266
267 pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
268 } while (addr < end);
269
270 return 0;
271}
272#endif
273
274static void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
275 unsigned long offset, size_t size, unsigned int mtype, void *caller)
276{
277 const struct mem_type *type;
278 int err;
279 unsigned long addr;
280 struct vm_struct *area;
281 phys_addr_t paddr = __pfn_to_phys(pfn);
282
283#ifndef CONFIG_ARM_LPAE
284 /*
285 * High mappings must be supersection aligned
286 */
287 if (pfn >= 0x100000 && (paddr & ~SUPERSECTION_MASK))
288 return NULL;
289#endif
290
291 type = get_mem_type(mtype);
292 if (!type)
293 return NULL;
294
295 /*
296 * Page align the mapping size, taking account of any offset.
297 */
298 size = PAGE_ALIGN(offset + size);
299
300 /*
301 * Try to reuse one of the static mapping whenever possible.
302 */
303 if (size && !(sizeof(phys_addr_t) == 4 && pfn >= 0x100000)) {
304 struct static_vm *svm;
305
306 svm = find_static_vm_paddr(paddr, size, mtype);
307 if (svm) {
308 addr = (unsigned long)svm->vm.addr;
309 addr += paddr - svm->vm.phys_addr;
310 return (void __iomem *) (offset + addr);
311 }
312 }
313
314 /*
315 * Don't allow RAM to be mapped with mismatched attributes - this
316 * causes problems with ARMv6+
317 */
318 if (WARN_ON(memblock_is_map_memory(PFN_PHYS(pfn)) &&
319 mtype != MT_MEMORY_RW))
320 return NULL;
321
322 area = get_vm_area_caller(size, VM_IOREMAP, caller);
323 if (!area)
324 return NULL;
325 addr = (unsigned long)area->addr;
326 area->phys_addr = paddr;
327
328#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
329 if (DOMAIN_IO == 0 &&
330 (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
331 cpu_is_xsc3()) && pfn >= 0x100000 &&
332 !((paddr | size | addr) & ~SUPERSECTION_MASK)) {
333 area->flags |= VM_ARM_SECTION_MAPPING;
334 err = remap_area_supersections(addr, pfn, size, type);
335 } else if (!((paddr | size | addr) & ~PMD_MASK)) {
336 area->flags |= VM_ARM_SECTION_MAPPING;
337 err = remap_area_sections(addr, pfn, size, type);
338 } else
339#endif
340 err = ioremap_page_range(addr, addr + size, paddr,
341 __pgprot(type->prot_pte));
342
343 if (err) {
344 vunmap((void *)addr);
345 return NULL;
346 }
347
348 flush_cache_vmap(addr, addr + size);
349 return (void __iomem *) (offset + addr);
350}
351
352void __iomem *__arm_ioremap_caller(phys_addr_t phys_addr, size_t size,
353 unsigned int mtype, void *caller)
354{
355 phys_addr_t last_addr;
356 unsigned long offset = phys_addr & ~PAGE_MASK;
357 unsigned long pfn = __phys_to_pfn(phys_addr);
358
359 /*
360 * Don't allow wraparound or zero size
361 */
362 last_addr = phys_addr + size - 1;
363 if (!size || last_addr < phys_addr)
364 return NULL;
365
366 return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
367 caller);
368}
369
370/*
371 * Remap an arbitrary physical address space into the kernel virtual
372 * address space. Needed when the kernel wants to access high addresses
373 * directly.
374 *
375 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
376 * have to convert them into an offset in a page-aligned mapping, but the
377 * caller shouldn't need to know that small detail.
378 */
379void __iomem *
380__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
381 unsigned int mtype)
382{
383 return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
384 __builtin_return_address(0));
385}
386EXPORT_SYMBOL(__arm_ioremap_pfn);
387
388void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t,
389 unsigned int, void *) =
390 __arm_ioremap_caller;
391
392void __iomem *ioremap(resource_size_t res_cookie, size_t size)
393{
394 return arch_ioremap_caller(res_cookie, size, MT_DEVICE,
395 __builtin_return_address(0));
396}
397EXPORT_SYMBOL(ioremap);
398
399void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
400{
401 return arch_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
402 __builtin_return_address(0));
403}
404EXPORT_SYMBOL(ioremap_cache);
405
406void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
407{
408 return arch_ioremap_caller(res_cookie, size, MT_DEVICE_WC,
409 __builtin_return_address(0));
410}
411EXPORT_SYMBOL(ioremap_wc);
412
413/*
414 * Remap an arbitrary physical address space into the kernel virtual
415 * address space as memory. Needed when the kernel wants to execute
416 * code in external memory. This is needed for reprogramming source
417 * clocks that would affect normal memory for example. Please see
418 * CONFIG_GENERIC_ALLOCATOR for allocating external memory.
419 */
420void __iomem *
421__arm_ioremap_exec(phys_addr_t phys_addr, size_t size, bool cached)
422{
423 unsigned int mtype;
424
425 if (cached)
426 mtype = MT_MEMORY_RWX;
427 else
428 mtype = MT_MEMORY_RWX_NONCACHED;
429
430 return __arm_ioremap_caller(phys_addr, size, mtype,
431 __builtin_return_address(0));
432}
433
434void __arm_iomem_set_ro(void __iomem *ptr, size_t size)
435{
436 set_memory_ro((unsigned long)ptr, PAGE_ALIGN(size) / PAGE_SIZE);
437}
438
439void *arch_memremap_wb(phys_addr_t phys_addr, size_t size)
440{
441 return (__force void *)arch_ioremap_caller(phys_addr, size,
442 MT_MEMORY_RW,
443 __builtin_return_address(0));
444}
445
446void iounmap(volatile void __iomem *io_addr)
447{
448 void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
449 struct static_vm *svm;
450
451 /* If this is a static mapping, we must leave it alone */
452 svm = find_static_vm_vaddr(addr);
453 if (svm)
454 return;
455
456#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
457 {
458 struct vm_struct *vm;
459
460 vm = find_vm_area(addr);
461
462 /*
463 * If this is a section based mapping we need to handle it
464 * specially as the VM subsystem does not know how to handle
465 * such a beast.
466 */
467 if (vm && (vm->flags & VM_ARM_SECTION_MAPPING))
468 unmap_area_sections((unsigned long)vm->addr, vm->size);
469 }
470#endif
471
472 vunmap(addr);
473}
474EXPORT_SYMBOL(iounmap);
475
476#if defined(CONFIG_PCI) || IS_ENABLED(CONFIG_PCMCIA)
477static int pci_ioremap_mem_type = MT_DEVICE;
478
479void pci_ioremap_set_mem_type(int mem_type)
480{
481 pci_ioremap_mem_type = mem_type;
482}
483
484int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
485{
486 unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
487
488 if (!(res->flags & IORESOURCE_IO))
489 return -EINVAL;
490
491 if (res->end > IO_SPACE_LIMIT)
492 return -EINVAL;
493
494 return vmap_page_range(vaddr, vaddr + resource_size(res), phys_addr,
495 __pgprot(get_mem_type(pci_ioremap_mem_type)->prot_pte));
496}
497EXPORT_SYMBOL(pci_remap_iospace);
498
499void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size)
500{
501 return arch_ioremap_caller(res_cookie, size, MT_UNCACHED,
502 __builtin_return_address(0));
503}
504EXPORT_SYMBOL_GPL(pci_remap_cfgspace);
505#endif
506
507/*
508 * Must be called after early_fixmap_init
509 */
510void __init early_ioremap_init(void)
511{
512 early_ioremap_setup();
513}
514
515bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
516 unsigned long flags)
517{
518 unsigned long pfn = PHYS_PFN(offset);
519
520 return memblock_is_map_memory(pfn);
521}
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#include <linux/io.h>
28#include <linux/sizes.h>
29
30#include <asm/cp15.h>
31#include <asm/cputype.h>
32#include <asm/cacheflush.h>
33#include <asm/mmu_context.h>
34#include <asm/pgalloc.h>
35#include <asm/tlbflush.h>
36#include <asm/system_info.h>
37
38#include <asm/mach/map.h>
39#include <asm/mach/pci.h>
40#include "mm.h"
41
42
43LIST_HEAD(static_vmlist);
44
45static struct static_vm *find_static_vm_paddr(phys_addr_t paddr,
46 size_t size, unsigned int mtype)
47{
48 struct static_vm *svm;
49 struct vm_struct *vm;
50
51 list_for_each_entry(svm, &static_vmlist, list) {
52 vm = &svm->vm;
53 if (!(vm->flags & VM_ARM_STATIC_MAPPING))
54 continue;
55 if ((vm->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
56 continue;
57
58 if (vm->phys_addr > paddr ||
59 paddr + size - 1 > vm->phys_addr + vm->size - 1)
60 continue;
61
62 return svm;
63 }
64
65 return NULL;
66}
67
68struct static_vm *find_static_vm_vaddr(void *vaddr)
69{
70 struct static_vm *svm;
71 struct vm_struct *vm;
72
73 list_for_each_entry(svm, &static_vmlist, list) {
74 vm = &svm->vm;
75
76 /* static_vmlist is ascending order */
77 if (vm->addr > vaddr)
78 break;
79
80 if (vm->addr <= vaddr && vm->addr + vm->size > vaddr)
81 return svm;
82 }
83
84 return NULL;
85}
86
87void __init add_static_vm_early(struct static_vm *svm)
88{
89 struct static_vm *curr_svm;
90 struct vm_struct *vm;
91 void *vaddr;
92
93 vm = &svm->vm;
94 vm_area_add_early(vm);
95 vaddr = vm->addr;
96
97 list_for_each_entry(curr_svm, &static_vmlist, list) {
98 vm = &curr_svm->vm;
99
100 if (vm->addr > vaddr)
101 break;
102 }
103 list_add_tail(&svm->list, &curr_svm->list);
104}
105
106int ioremap_page(unsigned long virt, unsigned long phys,
107 const struct mem_type *mtype)
108{
109 return ioremap_page_range(virt, virt + PAGE_SIZE, phys,
110 __pgprot(mtype->prot_pte));
111}
112EXPORT_SYMBOL(ioremap_page);
113
114void __check_vmalloc_seq(struct mm_struct *mm)
115{
116 unsigned int seq;
117
118 do {
119 seq = init_mm.context.vmalloc_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.vmalloc_seq = seq;
125 } while (seq != init_mm.context.vmalloc_seq);
126}
127
128#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
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_caller() allocates a guard 4K page, so we need to
137 * mask the size back to 1MB aligned or we will overflow in the loop below.
138 */
139static void unmap_area_sections(unsigned long virt, unsigned long size)
140{
141 unsigned long addr = virt, end = virt + (size & ~(SZ_1M - 1));
142 pgd_t *pgd;
143 pud_t *pud;
144 pmd_t *pmdp;
145
146 flush_cache_vunmap(addr, end);
147 pgd = pgd_offset_k(addr);
148 pud = pud_offset(pgd, addr);
149 pmdp = pmd_offset(pud, addr);
150 do {
151 pmd_t pmd = *pmdp;
152
153 if (!pmd_none(pmd)) {
154 /*
155 * Clear the PMD from the page table, and
156 * increment the vmalloc sequence so others
157 * notice this change.
158 *
159 * Note: this is still racy on SMP machines.
160 */
161 pmd_clear(pmdp);
162 init_mm.context.vmalloc_seq++;
163
164 /*
165 * Free the page table, if there was one.
166 */
167 if ((pmd_val(pmd) & PMD_TYPE_MASK) == PMD_TYPE_TABLE)
168 pte_free_kernel(&init_mm, pmd_page_vaddr(pmd));
169 }
170
171 addr += PMD_SIZE;
172 pmdp += 2;
173 } while (addr < end);
174
175 /*
176 * Ensure that the active_mm is up to date - we want to
177 * catch any use-after-iounmap cases.
178 */
179 if (current->active_mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)
180 __check_vmalloc_seq(current->active_mm);
181
182 flush_tlb_kernel_range(virt, end);
183}
184
185static int
186remap_area_sections(unsigned long virt, unsigned long pfn,
187 size_t size, const struct mem_type *type)
188{
189 unsigned long addr = virt, end = virt + size;
190 pgd_t *pgd;
191 pud_t *pud;
192 pmd_t *pmd;
193
194 /*
195 * Remove and free any PTE-based mapping, and
196 * sync the current kernel mapping.
197 */
198 unmap_area_sections(virt, size);
199
200 pgd = pgd_offset_k(addr);
201 pud = pud_offset(pgd, addr);
202 pmd = pmd_offset(pud, addr);
203 do {
204 pmd[0] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
205 pfn += SZ_1M >> PAGE_SHIFT;
206 pmd[1] = __pmd(__pfn_to_phys(pfn) | type->prot_sect);
207 pfn += SZ_1M >> PAGE_SHIFT;
208 flush_pmd_entry(pmd);
209
210 addr += PMD_SIZE;
211 pmd += 2;
212 } while (addr < end);
213
214 return 0;
215}
216
217static int
218remap_area_supersections(unsigned long virt, unsigned long pfn,
219 size_t size, const struct mem_type *type)
220{
221 unsigned long addr = virt, end = virt + size;
222 pgd_t *pgd;
223 pud_t *pud;
224 pmd_t *pmd;
225
226 /*
227 * Remove and free any PTE-based mapping, and
228 * sync the current kernel mapping.
229 */
230 unmap_area_sections(virt, size);
231
232 pgd = pgd_offset_k(virt);
233 pud = pud_offset(pgd, addr);
234 pmd = pmd_offset(pud, addr);
235 do {
236 unsigned long super_pmd_val, i;
237
238 super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
239 PMD_SECT_SUPER;
240 super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
241
242 for (i = 0; i < 8; i++) {
243 pmd[0] = __pmd(super_pmd_val);
244 pmd[1] = __pmd(super_pmd_val);
245 flush_pmd_entry(pmd);
246
247 addr += PMD_SIZE;
248 pmd += 2;
249 }
250
251 pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
252 } while (addr < end);
253
254 return 0;
255}
256#endif
257
258void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
259 unsigned long offset, size_t size, unsigned int mtype, void *caller)
260{
261 const struct mem_type *type;
262 int err;
263 unsigned long addr;
264 struct vm_struct *area;
265 phys_addr_t paddr = __pfn_to_phys(pfn);
266
267#ifndef CONFIG_ARM_LPAE
268 /*
269 * High mappings must be supersection aligned
270 */
271 if (pfn >= 0x100000 && (paddr & ~SUPERSECTION_MASK))
272 return NULL;
273#endif
274
275 type = get_mem_type(mtype);
276 if (!type)
277 return NULL;
278
279 /*
280 * Page align the mapping size, taking account of any offset.
281 */
282 size = PAGE_ALIGN(offset + size);
283
284 /*
285 * Try to reuse one of the static mapping whenever possible.
286 */
287 if (size && !(sizeof(phys_addr_t) == 4 && pfn >= 0x100000)) {
288 struct static_vm *svm;
289
290 svm = find_static_vm_paddr(paddr, size, mtype);
291 if (svm) {
292 addr = (unsigned long)svm->vm.addr;
293 addr += paddr - svm->vm.phys_addr;
294 return (void __iomem *) (offset + addr);
295 }
296 }
297
298 /*
299 * Don't allow RAM to be mapped - this causes problems with ARMv6+
300 */
301 if (WARN_ON(pfn_valid(pfn)))
302 return NULL;
303
304 area = get_vm_area_caller(size, VM_IOREMAP, caller);
305 if (!area)
306 return NULL;
307 addr = (unsigned long)area->addr;
308 area->phys_addr = paddr;
309
310#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
311 if (DOMAIN_IO == 0 &&
312 (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
313 cpu_is_xsc3()) && pfn >= 0x100000 &&
314 !((paddr | size | addr) & ~SUPERSECTION_MASK)) {
315 area->flags |= VM_ARM_SECTION_MAPPING;
316 err = remap_area_supersections(addr, pfn, size, type);
317 } else if (!((paddr | size | addr) & ~PMD_MASK)) {
318 area->flags |= VM_ARM_SECTION_MAPPING;
319 err = remap_area_sections(addr, pfn, size, type);
320 } else
321#endif
322 err = ioremap_page_range(addr, addr + size, paddr,
323 __pgprot(type->prot_pte));
324
325 if (err) {
326 vunmap((void *)addr);
327 return NULL;
328 }
329
330 flush_cache_vmap(addr, addr + size);
331 return (void __iomem *) (offset + addr);
332}
333
334void __iomem *__arm_ioremap_caller(phys_addr_t phys_addr, size_t size,
335 unsigned int mtype, void *caller)
336{
337 phys_addr_t last_addr;
338 unsigned long offset = phys_addr & ~PAGE_MASK;
339 unsigned long pfn = __phys_to_pfn(phys_addr);
340
341 /*
342 * Don't allow wraparound or zero size
343 */
344 last_addr = phys_addr + size - 1;
345 if (!size || last_addr < phys_addr)
346 return NULL;
347
348 return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
349 caller);
350}
351
352/*
353 * Remap an arbitrary physical address space into the kernel virtual
354 * address space. Needed when the kernel wants to access high addresses
355 * directly.
356 *
357 * NOTE! We need to allow non-page-aligned mappings too: we will obviously
358 * have to convert them into an offset in a page-aligned mapping, but the
359 * caller shouldn't need to know that small detail.
360 */
361void __iomem *
362__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
363 unsigned int mtype)
364{
365 return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
366 __builtin_return_address(0));
367}
368EXPORT_SYMBOL(__arm_ioremap_pfn);
369
370void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t,
371 unsigned int, void *) =
372 __arm_ioremap_caller;
373
374void __iomem *
375__arm_ioremap(phys_addr_t phys_addr, size_t size, unsigned int mtype)
376{
377 return arch_ioremap_caller(phys_addr, size, mtype,
378 __builtin_return_address(0));
379}
380EXPORT_SYMBOL(__arm_ioremap);
381
382/*
383 * Remap an arbitrary physical address space into the kernel virtual
384 * address space as memory. Needed when the kernel wants to execute
385 * code in external memory. This is needed for reprogramming source
386 * clocks that would affect normal memory for example. Please see
387 * CONFIG_GENERIC_ALLOCATOR for allocating external memory.
388 */
389void __iomem *
390__arm_ioremap_exec(phys_addr_t phys_addr, size_t size, bool cached)
391{
392 unsigned int mtype;
393
394 if (cached)
395 mtype = MT_MEMORY_RWX;
396 else
397 mtype = MT_MEMORY_RWX_NONCACHED;
398
399 return __arm_ioremap_caller(phys_addr, size, mtype,
400 __builtin_return_address(0));
401}
402
403void __iounmap(volatile void __iomem *io_addr)
404{
405 void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
406 struct static_vm *svm;
407
408 /* If this is a static mapping, we must leave it alone */
409 svm = find_static_vm_vaddr(addr);
410 if (svm)
411 return;
412
413#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
414 {
415 struct vm_struct *vm;
416
417 vm = find_vm_area(addr);
418
419 /*
420 * If this is a section based mapping we need to handle it
421 * specially as the VM subsystem does not know how to handle
422 * such a beast.
423 */
424 if (vm && (vm->flags & VM_ARM_SECTION_MAPPING))
425 unmap_area_sections((unsigned long)vm->addr, vm->size);
426 }
427#endif
428
429 vunmap(addr);
430}
431
432void (*arch_iounmap)(volatile void __iomem *) = __iounmap;
433
434void __arm_iounmap(volatile void __iomem *io_addr)
435{
436 arch_iounmap(io_addr);
437}
438EXPORT_SYMBOL(__arm_iounmap);
439
440#ifdef CONFIG_PCI
441int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
442{
443 BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
444
445 return ioremap_page_range(PCI_IO_VIRT_BASE + offset,
446 PCI_IO_VIRT_BASE + offset + SZ_64K,
447 phys_addr,
448 __pgprot(get_mem_type(MT_DEVICE)->prot_pte));
449}
450EXPORT_SYMBOL_GPL(pci_ioremap_io);
451#endif