Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 37 | |
| 38 | #include <asm/pgalloc.h> |
| 39 | #include <asm/page.h> |
| 40 | #include <asm/prom.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 41 | #include <asm/io.h> |
| 42 | #include <asm/mmu_context.h> |
| 43 | #include <asm/pgtable.h> |
| 44 | #include <asm/mmu.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 45 | #include <asm/smp.h> |
| 46 | #include <asm/machdep.h> |
| 47 | #include <asm/tlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 48 | #include <asm/processor.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 49 | #include <asm/cputable.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | #include <asm/sections.h> |
| 51 | #include <asm/system.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 52 | #include <asm/abs_addr.h> |
Stephen Rothwell | 5e203d6 | 2006-09-25 13:36:31 +1000 | [diff] [blame] | 53 | #include <asm/firmware.h> |
David Gibson | 800fc3e | 2005-11-16 15:43:48 +1100 | [diff] [blame] | 54 | |
| 55 | #include "mmu_decl.h" |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 56 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 57 | unsigned long ioremap_bot = IOREMAP_BASE; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 58 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 59 | /* |
| 60 | * map_io_page currently only called by __ioremap |
| 61 | * map_io_page adds an entry to the ioremap page table |
| 62 | * and adds an entry to the HPT, possibly bolting it |
| 63 | */ |
| 64 | static int map_io_page(unsigned long ea, unsigned long pa, int flags) |
| 65 | { |
| 66 | pgd_t *pgdp; |
| 67 | pud_t *pudp; |
| 68 | pmd_t *pmdp; |
| 69 | pte_t *ptep; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 70 | |
| 71 | if (mem_init_done) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 72 | pgdp = pgd_offset_k(ea); |
| 73 | pudp = pud_alloc(&init_mm, pgdp, ea); |
| 74 | if (!pudp) |
| 75 | return -ENOMEM; |
| 76 | pmdp = pmd_alloc(&init_mm, pudp, ea); |
| 77 | if (!pmdp) |
| 78 | return -ENOMEM; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 79 | ptep = pte_alloc_kernel(pmdp, ea); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 80 | if (!ptep) |
| 81 | return -ENOMEM; |
| 82 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, |
| 83 | __pgprot(flags))); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 84 | } else { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 85 | /* |
| 86 | * If the mm subsystem is not fully up, we cannot create a |
| 87 | * linux page table entry for this mapping. Simply bolt an |
| 88 | * entry in the hardware page table. |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 89 | * |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 90 | */ |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 91 | if (htab_bolt_mapping(ea, (unsigned long)ea + PAGE_SIZE, |
| 92 | pa, flags, mmu_io_psize)) { |
Benjamin Herrenschmidt | 77ac166 | 2005-11-10 11:12:11 +1100 | [diff] [blame] | 93 | printk(KERN_ERR "Failed to do bolted mapping IO " |
| 94 | "memory at %016lx !\n", pa); |
| 95 | return -ENOMEM; |
| 96 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 97 | } |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 102 | /** |
| 103 | * __ioremap_at - Low level function to establish the page tables |
| 104 | * for an IO mapping |
| 105 | */ |
| 106 | void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 107 | unsigned long flags) |
| 108 | { |
| 109 | unsigned long i; |
| 110 | |
| 111 | if ((flags & _PAGE_PRESENT) == 0) |
| 112 | flags |= pgprot_val(PAGE_KERNEL); |
| 113 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 114 | WARN_ON(pa & ~PAGE_MASK); |
| 115 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); |
| 116 | WARN_ON(size & ~PAGE_MASK); |
| 117 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 118 | for (i = 0; i < size; i += PAGE_SIZE) |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 119 | if (map_io_page((unsigned long)ea+i, pa+i, flags)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 120 | return NULL; |
| 121 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 122 | return (void __iomem *)ea; |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * __iounmap_from - Low level function to tear down the page tables |
| 127 | * for an IO mapping. This is used for mappings that |
| 128 | * are manipulated manually, like partial unmapping of |
| 129 | * PCI IOs or ISA space. |
| 130 | */ |
| 131 | void __iounmap_at(void *ea, unsigned long size) |
| 132 | { |
| 133 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); |
| 134 | WARN_ON(size & ~PAGE_MASK); |
| 135 | |
| 136 | unmap_kernel_range((unsigned long)ea, size); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 137 | } |
| 138 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 139 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 140 | unsigned long flags) |
| 141 | { |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 142 | phys_addr_t paligned; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 143 | void __iomem *ret; |
| 144 | |
| 145 | /* |
| 146 | * Choose an address to map it to. |
| 147 | * Once the imalloc system is running, we use it. |
| 148 | * Before that, we map using addresses going |
| 149 | * up from ioremap_bot. imalloc will use |
| 150 | * the addresses from ioremap_bot through |
| 151 | * IMALLOC_END |
| 152 | * |
| 153 | */ |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 154 | paligned = addr & PAGE_MASK; |
| 155 | size = PAGE_ALIGN(addr + size) - paligned; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 156 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 157 | if ((size == 0) || (paligned == 0)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 158 | return NULL; |
| 159 | |
| 160 | if (mem_init_done) { |
| 161 | struct vm_struct *area; |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 162 | |
| 163 | area = __get_vm_area(size, VM_IOREMAP, |
| 164 | ioremap_bot, IOREMAP_END); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 165 | if (area == NULL) |
| 166 | return NULL; |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 167 | ret = __ioremap_at(paligned, area->addr, size, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 168 | if (!ret) |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 169 | vunmap(area->addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 170 | } else { |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 171 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 172 | if (ret) |
| 173 | ioremap_bot += size; |
| 174 | } |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 175 | |
| 176 | if (ret) |
| 177 | ret += addr & ~PAGE_MASK; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 178 | return ret; |
| 179 | } |
| 180 | |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 181 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 182 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 183 | { |
| 184 | unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED; |
| 185 | |
| 186 | if (ppc_md.ioremap) |
| 187 | return ppc_md.ioremap(addr, size, flags); |
| 188 | return __ioremap(addr, size, flags); |
| 189 | } |
| 190 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 191 | void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 192 | unsigned long flags) |
| 193 | { |
| 194 | if (ppc_md.ioremap) |
| 195 | return ppc_md.ioremap(addr, size, flags); |
| 196 | return __ioremap(addr, size, flags); |
| 197 | } |
| 198 | |
| 199 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 200 | /* |
| 201 | * Unmap an IO region and remove it from imalloc'd list. |
| 202 | * Access to IO memory should be serialized by driver. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 203 | */ |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 204 | void __iounmap(volatile void __iomem *token) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 205 | { |
| 206 | void *addr; |
| 207 | |
| 208 | if (!mem_init_done) |
| 209 | return; |
| 210 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame^] | 211 | addr = (void *) ((unsigned long __force) |
| 212 | PCI_FIX_ADDR(token) & PAGE_MASK); |
| 213 | if ((unsigned long)addr < ioremap_bot) { |
| 214 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" |
| 215 | " at 0x%p\n", addr); |
| 216 | return; |
| 217 | } |
| 218 | vunmap(addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 219 | } |
| 220 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 221 | void iounmap(volatile void __iomem *token) |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 222 | { |
| 223 | if (ppc_md.iounmap) |
| 224 | ppc_md.iounmap(token); |
| 225 | else |
| 226 | __iounmap(token); |
| 227 | } |
| 228 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 229 | EXPORT_SYMBOL(ioremap); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 230 | EXPORT_SYMBOL(ioremap_flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 231 | EXPORT_SYMBOL(__ioremap); |
| 232 | EXPORT_SYMBOL(iounmap); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 233 | EXPORT_SYMBOL(__iounmap); |