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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 | |
10 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
11 | * | |
12 | * Derived from "arch/i386/mm/init.c" | |
13 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
14 | * | |
15 | * Dave Engebretsen <engebret@us.ibm.com> | |
16 | * Rework for PPC64 port. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | * | |
23 | */ | |
24 | ||
14cf11af PM |
25 | #include <linux/signal.h> |
26 | #include <linux/sched.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/string.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/mman.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/swap.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/vmalloc.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/delay.h> | |
38 | #include <linux/bootmem.h> | |
39 | #include <linux/highmem.h> | |
40 | #include <linux/idr.h> | |
41 | #include <linux/nodemask.h> | |
42 | #include <linux/module.h> | |
43 | ||
44 | #include <asm/pgalloc.h> | |
45 | #include <asm/page.h> | |
46 | #include <asm/prom.h> | |
47 | #include <asm/lmb.h> | |
48 | #include <asm/rtas.h> | |
49 | #include <asm/io.h> | |
50 | #include <asm/mmu_context.h> | |
51 | #include <asm/pgtable.h> | |
52 | #include <asm/mmu.h> | |
53 | #include <asm/uaccess.h> | |
54 | #include <asm/smp.h> | |
55 | #include <asm/machdep.h> | |
56 | #include <asm/tlb.h> | |
57 | #include <asm/eeh.h> | |
58 | #include <asm/processor.h> | |
59 | #include <asm/mmzone.h> | |
60 | #include <asm/cputable.h> | |
14cf11af PM |
61 | #include <asm/sections.h> |
62 | #include <asm/system.h> | |
63 | #include <asm/iommu.h> | |
64 | #include <asm/abs_addr.h> | |
65 | #include <asm/vdso.h> | |
800fc3ee DG |
66 | |
67 | #include "mmu_decl.h" | |
14cf11af | 68 | |
14cf11af PM |
69 | unsigned long ioremap_bot = IMALLOC_BASE; |
70 | static unsigned long phbs_io_bot = PHBS_IO_BASE; | |
71 | ||
14cf11af PM |
72 | #ifdef CONFIG_PPC_ISERIES |
73 | ||
74 | void __iomem *ioremap(unsigned long addr, unsigned long size) | |
75 | { | |
76 | return (void __iomem *)addr; | |
77 | } | |
78 | ||
79 | extern void __iomem *__ioremap(unsigned long addr, unsigned long size, | |
80 | unsigned long flags) | |
81 | { | |
82 | return (void __iomem *)addr; | |
83 | } | |
84 | ||
85 | void iounmap(volatile void __iomem *addr) | |
86 | { | |
87 | return; | |
88 | } | |
89 | ||
90 | #else | |
91 | ||
92 | /* | |
93 | * map_io_page currently only called by __ioremap | |
94 | * map_io_page adds an entry to the ioremap page table | |
95 | * and adds an entry to the HPT, possibly bolting it | |
96 | */ | |
97 | static int map_io_page(unsigned long ea, unsigned long pa, int flags) | |
98 | { | |
99 | pgd_t *pgdp; | |
100 | pud_t *pudp; | |
101 | pmd_t *pmdp; | |
102 | pte_t *ptep; | |
14cf11af PM |
103 | |
104 | if (mem_init_done) { | |
14cf11af PM |
105 | pgdp = pgd_offset_k(ea); |
106 | pudp = pud_alloc(&init_mm, pgdp, ea); | |
107 | if (!pudp) | |
108 | return -ENOMEM; | |
109 | pmdp = pmd_alloc(&init_mm, pudp, ea); | |
110 | if (!pmdp) | |
111 | return -ENOMEM; | |
23fd0775 | 112 | ptep = pte_alloc_kernel(pmdp, ea); |
14cf11af PM |
113 | if (!ptep) |
114 | return -ENOMEM; | |
115 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
116 | __pgprot(flags))); | |
14cf11af | 117 | } else { |
14cf11af PM |
118 | /* |
119 | * If the mm subsystem is not fully up, we cannot create a | |
120 | * linux page table entry for this mapping. Simply bolt an | |
121 | * entry in the hardware page table. | |
3c726f8d | 122 | * |
14cf11af | 123 | */ |
3c726f8d | 124 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
77ac166f BH |
125 | mmu_virtual_psize)) { |
126 | printk(KERN_ERR "Failed to do bolted mapping IO " | |
127 | "memory at %016lx !\n", pa); | |
128 | return -ENOMEM; | |
129 | } | |
14cf11af PM |
130 | } |
131 | return 0; | |
132 | } | |
133 | ||
134 | ||
135 | static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa, | |
136 | unsigned long ea, unsigned long size, | |
137 | unsigned long flags) | |
138 | { | |
139 | unsigned long i; | |
140 | ||
141 | if ((flags & _PAGE_PRESENT) == 0) | |
142 | flags |= pgprot_val(PAGE_KERNEL); | |
143 | ||
144 | for (i = 0; i < size; i += PAGE_SIZE) | |
145 | if (map_io_page(ea+i, pa+i, flags)) | |
146 | return NULL; | |
147 | ||
148 | return (void __iomem *) (ea + (addr & ~PAGE_MASK)); | |
149 | } | |
150 | ||
151 | ||
152 | void __iomem * | |
153 | ioremap(unsigned long addr, unsigned long size) | |
154 | { | |
155 | return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED); | |
156 | } | |
157 | ||
158 | void __iomem * __ioremap(unsigned long addr, unsigned long size, | |
159 | unsigned long flags) | |
160 | { | |
161 | unsigned long pa, ea; | |
162 | void __iomem *ret; | |
163 | ||
164 | /* | |
165 | * Choose an address to map it to. | |
166 | * Once the imalloc system is running, we use it. | |
167 | * Before that, we map using addresses going | |
168 | * up from ioremap_bot. imalloc will use | |
169 | * the addresses from ioremap_bot through | |
170 | * IMALLOC_END | |
171 | * | |
172 | */ | |
173 | pa = addr & PAGE_MASK; | |
174 | size = PAGE_ALIGN(addr + size) - pa; | |
175 | ||
d177c207 | 176 | if ((size == 0) || (pa == 0)) |
14cf11af PM |
177 | return NULL; |
178 | ||
179 | if (mem_init_done) { | |
180 | struct vm_struct *area; | |
181 | area = im_get_free_area(size); | |
182 | if (area == NULL) | |
183 | return NULL; | |
184 | ea = (unsigned long)(area->addr); | |
185 | ret = __ioremap_com(addr, pa, ea, size, flags); | |
186 | if (!ret) | |
187 | im_free(area->addr); | |
188 | } else { | |
189 | ea = ioremap_bot; | |
190 | ret = __ioremap_com(addr, pa, ea, size, flags); | |
191 | if (ret) | |
192 | ioremap_bot += size; | |
193 | } | |
194 | return ret; | |
195 | } | |
196 | ||
197 | #define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK)) | |
198 | ||
199 | int __ioremap_explicit(unsigned long pa, unsigned long ea, | |
200 | unsigned long size, unsigned long flags) | |
201 | { | |
202 | struct vm_struct *area; | |
203 | void __iomem *ret; | |
204 | ||
205 | /* For now, require page-aligned values for pa, ea, and size */ | |
206 | if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) || | |
207 | !IS_PAGE_ALIGNED(size)) { | |
208 | printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__); | |
209 | return 1; | |
210 | } | |
211 | ||
212 | if (!mem_init_done) { | |
213 | /* Two things to consider in this case: | |
214 | * 1) No records will be kept (imalloc, etc) that the region | |
215 | * has been remapped | |
216 | * 2) It won't be easy to iounmap() the region later (because | |
217 | * of 1) | |
218 | */ | |
219 | ; | |
220 | } else { | |
221 | area = im_get_area(ea, size, | |
222 | IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS); | |
223 | if (area == NULL) { | |
224 | /* Expected when PHB-dlpar is in play */ | |
225 | return 1; | |
226 | } | |
227 | if (ea != (unsigned long) area->addr) { | |
228 | printk(KERN_ERR "unexpected addr return from " | |
229 | "im_get_area\n"); | |
230 | return 1; | |
231 | } | |
232 | } | |
233 | ||
234 | ret = __ioremap_com(pa, pa, ea, size, flags); | |
235 | if (ret == NULL) { | |
236 | printk(KERN_ERR "ioremap_explicit() allocation failure !\n"); | |
237 | return 1; | |
238 | } | |
239 | if (ret != (void *) ea) { | |
240 | printk(KERN_ERR "__ioremap_com() returned unexpected addr\n"); | |
241 | return 1; | |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Unmap an IO region and remove it from imalloc'd list. | |
249 | * Access to IO memory should be serialized by driver. | |
250 | * This code is modeled after vmalloc code - unmap_vm_area() | |
251 | * | |
252 | * XXX what about calls before mem_init_done (ie python_countermeasures()) | |
253 | */ | |
254 | void iounmap(volatile void __iomem *token) | |
255 | { | |
256 | void *addr; | |
257 | ||
258 | if (!mem_init_done) | |
259 | return; | |
260 | ||
261 | addr = (void *) ((unsigned long __force) token & PAGE_MASK); | |
262 | ||
263 | im_free(addr); | |
264 | } | |
265 | ||
266 | static int iounmap_subset_regions(unsigned long addr, unsigned long size) | |
267 | { | |
268 | struct vm_struct *area; | |
269 | ||
270 | /* Check whether subsets of this region exist */ | |
271 | area = im_get_area(addr, size, IM_REGION_SUPERSET); | |
272 | if (area == NULL) | |
273 | return 1; | |
274 | ||
275 | while (area) { | |
276 | iounmap((void __iomem *) area->addr); | |
277 | area = im_get_area(addr, size, | |
278 | IM_REGION_SUPERSET); | |
279 | } | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | int iounmap_explicit(volatile void __iomem *start, unsigned long size) | |
285 | { | |
286 | struct vm_struct *area; | |
287 | unsigned long addr; | |
288 | int rc; | |
289 | ||
290 | addr = (unsigned long __force) start & PAGE_MASK; | |
291 | ||
292 | /* Verify that the region either exists or is a subset of an existing | |
293 | * region. In the latter case, split the parent region to create | |
294 | * the exact region | |
295 | */ | |
296 | area = im_get_area(addr, size, | |
297 | IM_REGION_EXISTS | IM_REGION_SUBSET); | |
298 | if (area == NULL) { | |
299 | /* Determine whether subset regions exist. If so, unmap */ | |
300 | rc = iounmap_subset_regions(addr, size); | |
301 | if (rc) { | |
302 | printk(KERN_ERR | |
303 | "%s() cannot unmap nonexistent range 0x%lx\n", | |
304 | __FUNCTION__, addr); | |
305 | return 1; | |
306 | } | |
307 | } else { | |
308 | iounmap((void __iomem *) area->addr); | |
309 | } | |
310 | /* | |
311 | * FIXME! This can't be right: | |
312 | iounmap(area->addr); | |
313 | * Maybe it should be "iounmap(area);" | |
314 | */ | |
315 | return 0; | |
316 | } | |
317 | ||
318 | #endif | |
319 | ||
320 | EXPORT_SYMBOL(ioremap); | |
321 | EXPORT_SYMBOL(__ioremap); | |
322 | EXPORT_SYMBOL(iounmap); | |
ab1f9dac PM |
323 | |
324 | void __iomem * reserve_phb_iospace(unsigned long size) | |
325 | { | |
326 | void __iomem *virt_addr; | |
327 | ||
328 | if (phbs_io_bot >= IMALLOC_BASE) | |
329 | panic("reserve_phb_iospace(): phb io space overflow\n"); | |
330 | ||
331 | virt_addr = (void __iomem *) phbs_io_bot; | |
332 | phbs_io_bot += size; | |
333 | ||
334 | return virt_addr; | |
335 | } |