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