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 | |
| 25 | #include <linux/config.h> |
| 26 | #include <linux/signal.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/string.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/mman.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/swap.h> |
| 35 | #include <linux/stddef.h> |
| 36 | #include <linux/vmalloc.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/delay.h> |
| 39 | #include <linux/bootmem.h> |
| 40 | #include <linux/highmem.h> |
| 41 | #include <linux/idr.h> |
| 42 | #include <linux/nodemask.h> |
| 43 | #include <linux/module.h> |
| 44 | |
| 45 | #include <asm/pgalloc.h> |
| 46 | #include <asm/page.h> |
| 47 | #include <asm/prom.h> |
| 48 | #include <asm/lmb.h> |
| 49 | #include <asm/rtas.h> |
| 50 | #include <asm/io.h> |
| 51 | #include <asm/mmu_context.h> |
| 52 | #include <asm/pgtable.h> |
| 53 | #include <asm/mmu.h> |
| 54 | #include <asm/uaccess.h> |
| 55 | #include <asm/smp.h> |
| 56 | #include <asm/machdep.h> |
| 57 | #include <asm/tlb.h> |
| 58 | #include <asm/eeh.h> |
| 59 | #include <asm/processor.h> |
| 60 | #include <asm/mmzone.h> |
| 61 | #include <asm/cputable.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 62 | #include <asm/sections.h> |
| 63 | #include <asm/system.h> |
| 64 | #include <asm/iommu.h> |
| 65 | #include <asm/abs_addr.h> |
| 66 | #include <asm/vdso.h> |
| 67 | #include <asm/imalloc.h> |
| 68 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 69 | unsigned long ioremap_bot = IMALLOC_BASE; |
| 70 | static unsigned long phbs_io_bot = PHBS_IO_BASE; |
| 71 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 103 | |
| 104 | if (mem_init_done) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 112 | ptep = pte_alloc_kernel(pmdp, ea); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 113 | if (!ptep) |
| 114 | return -ENOMEM; |
| 115 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, |
| 116 | __pgprot(flags))); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 117 | } else { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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. |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 122 | * |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 123 | */ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 124 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
Benjamin Herrenschmidt | 77ac166 | 2005-11-10 11:12:11 +1100 | [diff] [blame^] | 125 | mmu_virtual_psize)) { |
| 126 | printk(KERN_ERR "Failed to do bolted mapping IO " |
| 127 | "memory at %016lx !\n", pa); |
| 128 | return -ENOMEM; |
| 129 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
| 176 | if (size == 0) |
| 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); |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 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 | } |