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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> | |
14cf11af PM |
36 | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/prom.h> | |
14cf11af PM |
40 | #include <asm/io.h> |
41 | #include <asm/mmu_context.h> | |
42 | #include <asm/pgtable.h> | |
43 | #include <asm/mmu.h> | |
14cf11af PM |
44 | #include <asm/smp.h> |
45 | #include <asm/machdep.h> | |
46 | #include <asm/tlb.h> | |
14cf11af | 47 | #include <asm/processor.h> |
14cf11af | 48 | #include <asm/cputable.h> |
14cf11af PM |
49 | #include <asm/sections.h> |
50 | #include <asm/system.h> | |
14cf11af | 51 | #include <asm/abs_addr.h> |
5e203d68 | 52 | #include <asm/firmware.h> |
800fc3ee DG |
53 | |
54 | #include "mmu_decl.h" | |
14cf11af | 55 | |
3d5134ee | 56 | unsigned long ioremap_bot = IOREMAP_BASE; |
14cf11af | 57 | |
14cf11af PM |
58 | /* |
59 | * map_io_page currently only called by __ioremap | |
60 | * map_io_page adds an entry to the ioremap page table | |
61 | * and adds an entry to the HPT, possibly bolting it | |
62 | */ | |
63 | static int map_io_page(unsigned long ea, unsigned long pa, int flags) | |
64 | { | |
65 | pgd_t *pgdp; | |
66 | pud_t *pudp; | |
67 | pmd_t *pmdp; | |
68 | pte_t *ptep; | |
14cf11af PM |
69 | |
70 | if (mem_init_done) { | |
14cf11af PM |
71 | pgdp = pgd_offset_k(ea); |
72 | pudp = pud_alloc(&init_mm, pgdp, ea); | |
73 | if (!pudp) | |
74 | return -ENOMEM; | |
75 | pmdp = pmd_alloc(&init_mm, pudp, ea); | |
76 | if (!pmdp) | |
77 | return -ENOMEM; | |
23fd0775 | 78 | ptep = pte_alloc_kernel(pmdp, ea); |
14cf11af PM |
79 | if (!ptep) |
80 | return -ENOMEM; | |
81 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
82 | __pgprot(flags))); | |
14cf11af | 83 | } else { |
14cf11af PM |
84 | /* |
85 | * If the mm subsystem is not fully up, we cannot create a | |
86 | * linux page table entry for this mapping. Simply bolt an | |
87 | * entry in the hardware page table. | |
3c726f8d | 88 | * |
14cf11af | 89 | */ |
1189be65 PM |
90 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
91 | mmu_io_psize, mmu_kernel_ssize)) { | |
77ac166f BH |
92 | printk(KERN_ERR "Failed to do bolted mapping IO " |
93 | "memory at %016lx !\n", pa); | |
94 | return -ENOMEM; | |
95 | } | |
14cf11af PM |
96 | } |
97 | return 0; | |
98 | } | |
99 | ||
100 | ||
3d5134ee BH |
101 | /** |
102 | * __ioremap_at - Low level function to establish the page tables | |
103 | * for an IO mapping | |
104 | */ | |
105 | void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, | |
14cf11af PM |
106 | unsigned long flags) |
107 | { | |
108 | unsigned long i; | |
109 | ||
110 | if ((flags & _PAGE_PRESENT) == 0) | |
111 | flags |= pgprot_val(PAGE_KERNEL); | |
112 | ||
3d5134ee BH |
113 | WARN_ON(pa & ~PAGE_MASK); |
114 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
115 | WARN_ON(size & ~PAGE_MASK); | |
116 | ||
14cf11af | 117 | for (i = 0; i < size; i += PAGE_SIZE) |
3d5134ee | 118 | if (map_io_page((unsigned long)ea+i, pa+i, flags)) |
14cf11af PM |
119 | return NULL; |
120 | ||
3d5134ee BH |
121 | return (void __iomem *)ea; |
122 | } | |
123 | ||
124 | /** | |
125 | * __iounmap_from - Low level function to tear down the page tables | |
126 | * for an IO mapping. This is used for mappings that | |
127 | * are manipulated manually, like partial unmapping of | |
128 | * PCI IOs or ISA space. | |
129 | */ | |
130 | void __iounmap_at(void *ea, unsigned long size) | |
131 | { | |
132 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
133 | WARN_ON(size & ~PAGE_MASK); | |
134 | ||
135 | unmap_kernel_range((unsigned long)ea, size); | |
14cf11af PM |
136 | } |
137 | ||
68a64357 | 138 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
14cf11af PM |
139 | unsigned long flags) |
140 | { | |
3d5134ee | 141 | phys_addr_t paligned; |
14cf11af PM |
142 | void __iomem *ret; |
143 | ||
144 | /* | |
145 | * Choose an address to map it to. | |
146 | * Once the imalloc system is running, we use it. | |
147 | * Before that, we map using addresses going | |
148 | * up from ioremap_bot. imalloc will use | |
149 | * the addresses from ioremap_bot through | |
150 | * IMALLOC_END | |
151 | * | |
152 | */ | |
3d5134ee BH |
153 | paligned = addr & PAGE_MASK; |
154 | size = PAGE_ALIGN(addr + size) - paligned; | |
14cf11af | 155 | |
3d5134ee | 156 | if ((size == 0) || (paligned == 0)) |
14cf11af PM |
157 | return NULL; |
158 | ||
159 | if (mem_init_done) { | |
160 | struct vm_struct *area; | |
3d5134ee BH |
161 | |
162 | area = __get_vm_area(size, VM_IOREMAP, | |
163 | ioremap_bot, IOREMAP_END); | |
14cf11af PM |
164 | if (area == NULL) |
165 | return NULL; | |
3d5134ee | 166 | ret = __ioremap_at(paligned, area->addr, size, flags); |
14cf11af | 167 | if (!ret) |
3d5134ee | 168 | vunmap(area->addr); |
14cf11af | 169 | } else { |
3d5134ee | 170 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
14cf11af PM |
171 | if (ret) |
172 | ioremap_bot += size; | |
173 | } | |
3d5134ee BH |
174 | |
175 | if (ret) | |
176 | ret += addr & ~PAGE_MASK; | |
14cf11af PM |
177 | return ret; |
178 | } | |
179 | ||
4cb3cee0 | 180 | |
68a64357 | 181 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
4cb3cee0 BH |
182 | { |
183 | unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED; | |
184 | ||
185 | if (ppc_md.ioremap) | |
186 | return ppc_md.ioremap(addr, size, flags); | |
187 | return __ioremap(addr, size, flags); | |
188 | } | |
189 | ||
68a64357 | 190 | void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, |
4cb3cee0 BH |
191 | unsigned long flags) |
192 | { | |
193 | if (ppc_md.ioremap) | |
194 | return ppc_md.ioremap(addr, size, flags); | |
195 | return __ioremap(addr, size, flags); | |
196 | } | |
197 | ||
198 | ||
14cf11af PM |
199 | /* |
200 | * Unmap an IO region and remove it from imalloc'd list. | |
201 | * Access to IO memory should be serialized by driver. | |
14cf11af | 202 | */ |
68a64357 | 203 | void __iounmap(volatile void __iomem *token) |
14cf11af PM |
204 | { |
205 | void *addr; | |
206 | ||
207 | if (!mem_init_done) | |
208 | return; | |
209 | ||
3d5134ee BH |
210 | addr = (void *) ((unsigned long __force) |
211 | PCI_FIX_ADDR(token) & PAGE_MASK); | |
212 | if ((unsigned long)addr < ioremap_bot) { | |
213 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" | |
214 | " at 0x%p\n", addr); | |
215 | return; | |
216 | } | |
217 | vunmap(addr); | |
14cf11af PM |
218 | } |
219 | ||
68a64357 | 220 | void iounmap(volatile void __iomem *token) |
4cb3cee0 BH |
221 | { |
222 | if (ppc_md.iounmap) | |
223 | ppc_md.iounmap(token); | |
224 | else | |
225 | __iounmap(token); | |
226 | } | |
227 | ||
14cf11af | 228 | EXPORT_SYMBOL(ioremap); |
4cb3cee0 | 229 | EXPORT_SYMBOL(ioremap_flags); |
14cf11af | 230 | EXPORT_SYMBOL(__ioremap); |
a302cb9d | 231 | EXPORT_SYMBOL(__ioremap_at); |
14cf11af | 232 | EXPORT_SYMBOL(iounmap); |
4cb3cee0 | 233 | EXPORT_SYMBOL(__iounmap); |
a302cb9d | 234 | EXPORT_SYMBOL(__iounmap_at); |