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14cf11af PM |
1 | /* |
2 | * This file contains ioremap and related functions for 64-bit machines. | |
3 | * | |
4 | * Derived from arch/ppc64/mm/init.c | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
6 | * | |
7 | * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org) | |
8 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
9 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
10 | * |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * Dave Engebretsen <engebret@us.ibm.com> | |
15 | * Rework for PPC64 port. | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | * | |
22 | */ | |
23 | ||
14cf11af PM |
24 | #include <linux/signal.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/mman.h> | |
31 | #include <linux/mm.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/stddef.h> | |
34 | #include <linux/vmalloc.h> | |
35 | #include <linux/init.h> | |
a245067e BH |
36 | #include <linux/bootmem.h> |
37 | #include <linux/lmb.h> | |
14cf11af PM |
38 | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/page.h> | |
41 | #include <asm/prom.h> | |
14cf11af PM |
42 | #include <asm/io.h> |
43 | #include <asm/mmu_context.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/mmu.h> | |
14cf11af PM |
46 | #include <asm/smp.h> |
47 | #include <asm/machdep.h> | |
48 | #include <asm/tlb.h> | |
14cf11af | 49 | #include <asm/processor.h> |
14cf11af | 50 | #include <asm/cputable.h> |
14cf11af PM |
51 | #include <asm/sections.h> |
52 | #include <asm/system.h> | |
14cf11af | 53 | #include <asm/abs_addr.h> |
5e203d68 | 54 | #include <asm/firmware.h> |
800fc3ee DG |
55 | |
56 | #include "mmu_decl.h" | |
14cf11af | 57 | |
3d5134ee | 58 | unsigned long ioremap_bot = IOREMAP_BASE; |
14cf11af | 59 | |
a245067e BH |
60 | |
61 | #ifdef CONFIG_PPC_MMU_NOHASH | |
62 | static void *early_alloc_pgtable(unsigned long size) | |
63 | { | |
64 | void *pt; | |
65 | ||
66 | if (init_bootmem_done) | |
67 | pt = __alloc_bootmem(size, size, __pa(MAX_DMA_ADDRESS)); | |
68 | else | |
69 | pt = __va(lmb_alloc_base(size, size, | |
70 | __pa(MAX_DMA_ADDRESS))); | |
71 | memset(pt, 0, size); | |
72 | ||
73 | return pt; | |
74 | } | |
75 | #endif /* CONFIG_PPC_MMU_NOHASH */ | |
76 | ||
14cf11af | 77 | /* |
a245067e BH |
78 | * map_kernel_page currently only called by __ioremap |
79 | * map_kernel_page adds an entry to the ioremap page table | |
14cf11af PM |
80 | * and adds an entry to the HPT, possibly bolting it |
81 | */ | |
32a74949 | 82 | int map_kernel_page(unsigned long ea, unsigned long pa, int flags) |
14cf11af PM |
83 | { |
84 | pgd_t *pgdp; | |
85 | pud_t *pudp; | |
86 | pmd_t *pmdp; | |
87 | pte_t *ptep; | |
14cf11af | 88 | |
a245067e | 89 | if (slab_is_available()) { |
14cf11af PM |
90 | pgdp = pgd_offset_k(ea); |
91 | pudp = pud_alloc(&init_mm, pgdp, ea); | |
92 | if (!pudp) | |
93 | return -ENOMEM; | |
94 | pmdp = pmd_alloc(&init_mm, pudp, ea); | |
95 | if (!pmdp) | |
96 | return -ENOMEM; | |
23fd0775 | 97 | ptep = pte_alloc_kernel(pmdp, ea); |
14cf11af PM |
98 | if (!ptep) |
99 | return -ENOMEM; | |
100 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
101 | __pgprot(flags))); | |
14cf11af | 102 | } else { |
a245067e BH |
103 | #ifdef CONFIG_PPC_MMU_NOHASH |
104 | /* Warning ! This will blow up if bootmem is not initialized | |
105 | * which our ppc64 code is keen to do that, we'll need to | |
106 | * fix it and/or be more careful | |
107 | */ | |
108 | pgdp = pgd_offset_k(ea); | |
109 | #ifdef PUD_TABLE_SIZE | |
110 | if (pgd_none(*pgdp)) { | |
111 | pudp = early_alloc_pgtable(PUD_TABLE_SIZE); | |
112 | BUG_ON(pudp == NULL); | |
113 | pgd_populate(&init_mm, pgdp, pudp); | |
114 | } | |
115 | #endif /* PUD_TABLE_SIZE */ | |
116 | pudp = pud_offset(pgdp, ea); | |
117 | if (pud_none(*pudp)) { | |
118 | pmdp = early_alloc_pgtable(PMD_TABLE_SIZE); | |
119 | BUG_ON(pmdp == NULL); | |
120 | pud_populate(&init_mm, pudp, pmdp); | |
121 | } | |
122 | pmdp = pmd_offset(pudp, ea); | |
123 | if (!pmd_present(*pmdp)) { | |
124 | ptep = early_alloc_pgtable(PAGE_SIZE); | |
125 | BUG_ON(ptep == NULL); | |
126 | pmd_populate_kernel(&init_mm, pmdp, ptep); | |
127 | } | |
128 | ptep = pte_offset_kernel(pmdp, ea); | |
129 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
130 | __pgprot(flags))); | |
131 | #else /* CONFIG_PPC_MMU_NOHASH */ | |
14cf11af PM |
132 | /* |
133 | * If the mm subsystem is not fully up, we cannot create a | |
134 | * linux page table entry for this mapping. Simply bolt an | |
135 | * entry in the hardware page table. | |
3c726f8d | 136 | * |
14cf11af | 137 | */ |
1189be65 PM |
138 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
139 | mmu_io_psize, mmu_kernel_ssize)) { | |
77ac166f BH |
140 | printk(KERN_ERR "Failed to do bolted mapping IO " |
141 | "memory at %016lx !\n", pa); | |
142 | return -ENOMEM; | |
143 | } | |
a245067e | 144 | #endif /* !CONFIG_PPC_MMU_NOHASH */ |
14cf11af PM |
145 | } |
146 | return 0; | |
147 | } | |
148 | ||
149 | ||
3d5134ee BH |
150 | /** |
151 | * __ioremap_at - Low level function to establish the page tables | |
152 | * for an IO mapping | |
153 | */ | |
154 | void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, | |
14cf11af PM |
155 | unsigned long flags) |
156 | { | |
157 | unsigned long i; | |
158 | ||
a1f242ff | 159 | /* Make sure we have the base flags */ |
14cf11af PM |
160 | if ((flags & _PAGE_PRESENT) == 0) |
161 | flags |= pgprot_val(PAGE_KERNEL); | |
162 | ||
a1f242ff BH |
163 | /* Non-cacheable page cannot be coherent */ |
164 | if (flags & _PAGE_NO_CACHE) | |
165 | flags &= ~_PAGE_COHERENT; | |
166 | ||
167 | /* We don't support the 4K PFN hack with ioremap */ | |
168 | if (flags & _PAGE_4K_PFN) | |
169 | return NULL; | |
170 | ||
3d5134ee BH |
171 | WARN_ON(pa & ~PAGE_MASK); |
172 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
173 | WARN_ON(size & ~PAGE_MASK); | |
174 | ||
14cf11af | 175 | for (i = 0; i < size; i += PAGE_SIZE) |
a245067e | 176 | if (map_kernel_page((unsigned long)ea+i, pa+i, flags)) |
14cf11af PM |
177 | return NULL; |
178 | ||
3d5134ee BH |
179 | return (void __iomem *)ea; |
180 | } | |
181 | ||
182 | /** | |
183 | * __iounmap_from - Low level function to tear down the page tables | |
184 | * for an IO mapping. This is used for mappings that | |
185 | * are manipulated manually, like partial unmapping of | |
186 | * PCI IOs or ISA space. | |
187 | */ | |
188 | void __iounmap_at(void *ea, unsigned long size) | |
189 | { | |
190 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
191 | WARN_ON(size & ~PAGE_MASK); | |
192 | ||
193 | unmap_kernel_range((unsigned long)ea, size); | |
14cf11af PM |
194 | } |
195 | ||
1cdab55d BH |
196 | void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, |
197 | unsigned long flags, void *caller) | |
14cf11af | 198 | { |
3d5134ee | 199 | phys_addr_t paligned; |
14cf11af PM |
200 | void __iomem *ret; |
201 | ||
202 | /* | |
203 | * Choose an address to map it to. | |
204 | * Once the imalloc system is running, we use it. | |
205 | * Before that, we map using addresses going | |
206 | * up from ioremap_bot. imalloc will use | |
207 | * the addresses from ioremap_bot through | |
208 | * IMALLOC_END | |
209 | * | |
210 | */ | |
3d5134ee BH |
211 | paligned = addr & PAGE_MASK; |
212 | size = PAGE_ALIGN(addr + size) - paligned; | |
14cf11af | 213 | |
3d5134ee | 214 | if ((size == 0) || (paligned == 0)) |
14cf11af PM |
215 | return NULL; |
216 | ||
217 | if (mem_init_done) { | |
218 | struct vm_struct *area; | |
3d5134ee | 219 | |
1cdab55d BH |
220 | area = __get_vm_area_caller(size, VM_IOREMAP, |
221 | ioremap_bot, IOREMAP_END, | |
222 | caller); | |
14cf11af PM |
223 | if (area == NULL) |
224 | return NULL; | |
3d5134ee | 225 | ret = __ioremap_at(paligned, area->addr, size, flags); |
14cf11af | 226 | if (!ret) |
3d5134ee | 227 | vunmap(area->addr); |
14cf11af | 228 | } else { |
3d5134ee | 229 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
14cf11af PM |
230 | if (ret) |
231 | ioremap_bot += size; | |
232 | } | |
3d5134ee BH |
233 | |
234 | if (ret) | |
235 | ret += addr & ~PAGE_MASK; | |
14cf11af PM |
236 | return ret; |
237 | } | |
238 | ||
1cdab55d BH |
239 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
240 | unsigned long flags) | |
241 | { | |
242 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
243 | } | |
4cb3cee0 | 244 | |
68a64357 | 245 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
4cb3cee0 BH |
246 | { |
247 | unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED; | |
1cdab55d | 248 | void *caller = __builtin_return_address(0); |
4cb3cee0 BH |
249 | |
250 | if (ppc_md.ioremap) | |
1cdab55d BH |
251 | return ppc_md.ioremap(addr, size, flags, caller); |
252 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
253 | } |
254 | ||
68a64357 | 255 | void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, |
4cb3cee0 BH |
256 | unsigned long flags) |
257 | { | |
1cdab55d BH |
258 | void *caller = __builtin_return_address(0); |
259 | ||
a1f242ff BH |
260 | /* writeable implies dirty for kernel addresses */ |
261 | if (flags & _PAGE_RW) | |
262 | flags |= _PAGE_DIRTY; | |
263 | ||
264 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
265 | flags &= ~(_PAGE_USER | _PAGE_EXEC); | |
266 | ||
4cb3cee0 | 267 | if (ppc_md.ioremap) |
1cdab55d BH |
268 | return ppc_md.ioremap(addr, size, flags, caller); |
269 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
270 | } |
271 | ||
272 | ||
14cf11af PM |
273 | /* |
274 | * Unmap an IO region and remove it from imalloc'd list. | |
275 | * Access to IO memory should be serialized by driver. | |
14cf11af | 276 | */ |
68a64357 | 277 | void __iounmap(volatile void __iomem *token) |
14cf11af PM |
278 | { |
279 | void *addr; | |
280 | ||
281 | if (!mem_init_done) | |
282 | return; | |
283 | ||
3d5134ee BH |
284 | addr = (void *) ((unsigned long __force) |
285 | PCI_FIX_ADDR(token) & PAGE_MASK); | |
286 | if ((unsigned long)addr < ioremap_bot) { | |
287 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" | |
288 | " at 0x%p\n", addr); | |
289 | return; | |
290 | } | |
291 | vunmap(addr); | |
14cf11af PM |
292 | } |
293 | ||
68a64357 | 294 | void iounmap(volatile void __iomem *token) |
4cb3cee0 BH |
295 | { |
296 | if (ppc_md.iounmap) | |
297 | ppc_md.iounmap(token); | |
298 | else | |
299 | __iounmap(token); | |
300 | } | |
301 | ||
14cf11af | 302 | EXPORT_SYMBOL(ioremap); |
4cb3cee0 | 303 | EXPORT_SYMBOL(ioremap_flags); |
14cf11af | 304 | EXPORT_SYMBOL(__ioremap); |
a302cb9d | 305 | EXPORT_SYMBOL(__ioremap_at); |
14cf11af | 306 | EXPORT_SYMBOL(iounmap); |
4cb3cee0 | 307 | EXPORT_SYMBOL(__iounmap); |
a302cb9d | 308 | EXPORT_SYMBOL(__iounmap_at); |