Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 2 | * arch/sh/mm/ioremap_64.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000, 2001 Paolo Alberelli |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 5 | * Copyright (C) 2003 - 2007 Paul Mundt |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * Mostly derived from arch/sh/mm/ioremap.c which, in turn is mostly |
| 8 | * derived from arch/i386/mm/ioremap.c . |
| 9 | * |
| 10 | * (C) Copyright 1995 1996 Linus Torvalds |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 11 | * |
| 12 | * This file is subject to the terms and conditions of the GNU General Public |
| 13 | * License. See the file "COPYING" in the main directory of this archive |
| 14 | * for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/ioport.h> |
Paul Mundt | 749c849 | 2007-10-01 17:36:47 +0900 | [diff] [blame] | 18 | #include <linux/module.h> |
Paul Mundt | ad81eb9 | 2007-11-11 18:43:33 +0900 | [diff] [blame] | 19 | #include <linux/mm.h> |
| 20 | #include <linux/io.h> |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 21 | #include <linux/bootmem.h> |
Paul Mundt | 2b6a8d4 | 2007-11-19 14:26:09 +0900 | [diff] [blame] | 22 | #include <linux/proc_fs.h> |
Paul Mundt | ad81eb9 | 2007-11-11 18:43:33 +0900 | [diff] [blame] | 23 | #include <asm/page.h> |
Paul Mundt | 749c849 | 2007-10-01 17:36:47 +0900 | [diff] [blame] | 24 | #include <asm/pgalloc.h> |
Paul Mundt | ad81eb9 | 2007-11-11 18:43:33 +0900 | [diff] [blame] | 25 | #include <asm/addrspace.h> |
| 26 | #include <asm/cacheflush.h> |
Paul Mundt | 749c849 | 2007-10-01 17:36:47 +0900 | [diff] [blame] | 27 | #include <asm/tlbflush.h> |
Paul Mundt | ad81eb9 | 2007-11-11 18:43:33 +0900 | [diff] [blame] | 28 | #include <asm/mmu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | static void shmedia_mapioaddr(unsigned long, unsigned long); |
| 31 | static unsigned long shmedia_ioremap(struct resource *, u32, int); |
| 32 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | /* |
| 34 | * Generic mapping function (not visible outside): |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * Remap an arbitrary physical address space into the kernel virtual |
| 39 | * address space. Needed when the kernel wants to access high addresses |
| 40 | * directly. |
| 41 | * |
| 42 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 43 | * have to convert them into an offset in a page-aligned mapping, but the |
| 44 | * caller shouldn't need to know that small detail. |
| 45 | */ |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 46 | void *__ioremap(unsigned long phys_addr, unsigned long size, |
| 47 | unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | void * addr; |
| 50 | struct vm_struct * area; |
| 51 | unsigned long offset, last_addr; |
Haavard Skinnemoen | 10731b8 | 2006-12-08 02:38:08 -0800 | [diff] [blame] | 52 | pgprot_t pgprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* Don't allow wraparound or zero size */ |
| 55 | last_addr = phys_addr + size - 1; |
| 56 | if (!size || last_addr < phys_addr) |
| 57 | return NULL; |
| 58 | |
Haavard Skinnemoen | 10731b8 | 2006-12-08 02:38:08 -0800 | [diff] [blame] | 59 | pgprot = __pgprot(_PAGE_PRESENT | _PAGE_READ | |
| 60 | _PAGE_WRITE | _PAGE_DIRTY | |
| 61 | _PAGE_ACCESSED | _PAGE_SHARED | flags); |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | /* |
| 64 | * Mappings have to be page-aligned |
| 65 | */ |
| 66 | offset = phys_addr & ~PAGE_MASK; |
| 67 | phys_addr &= PAGE_MASK; |
| 68 | size = PAGE_ALIGN(last_addr + 1) - phys_addr; |
| 69 | |
| 70 | /* |
| 71 | * Ok, go for it.. |
| 72 | */ |
| 73 | area = get_vm_area(size, VM_IOREMAP); |
| 74 | pr_debug("Get vm_area returns %p addr %p\n",area,area->addr); |
| 75 | if (!area) |
| 76 | return NULL; |
| 77 | area->phys_addr = phys_addr; |
| 78 | addr = area->addr; |
Haavard Skinnemoen | 10731b8 | 2006-12-08 02:38:08 -0800 | [diff] [blame] | 79 | if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, |
| 80 | phys_addr, pgprot)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | vunmap(addr); |
| 82 | return NULL; |
| 83 | } |
| 84 | return (void *) (offset + (char *)addr); |
| 85 | } |
Paul Mundt | 749c849 | 2007-10-01 17:36:47 +0900 | [diff] [blame] | 86 | EXPORT_SYMBOL(__ioremap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 88 | void __iounmap(void *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | struct vm_struct *area; |
| 91 | |
| 92 | vfree((void *) (PAGE_MASK & (unsigned long) addr)); |
| 93 | area = remove_vm_area((void *) (PAGE_MASK & (unsigned long) addr)); |
| 94 | if (!area) { |
| 95 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | kfree(area); |
| 100 | } |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 101 | EXPORT_SYMBOL(__iounmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static struct resource shmedia_iomap = { |
| 104 | .name = "shmedia_iomap", |
| 105 | .start = IOBASE_VADDR + PAGE_SIZE, |
| 106 | .end = IOBASE_END - 1, |
| 107 | }; |
| 108 | |
| 109 | static void shmedia_mapioaddr(unsigned long pa, unsigned long va); |
| 110 | static void shmedia_unmapioaddr(unsigned long vaddr); |
| 111 | static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz); |
| 112 | |
| 113 | /* |
| 114 | * We have the same problem as the SPARC, so lets have the same comment: |
| 115 | * Our mini-allocator... |
| 116 | * Boy this is gross! We need it because we must map I/O for |
| 117 | * timers and interrupt controller before the kmalloc is available. |
| 118 | */ |
| 119 | |
| 120 | #define XNMLN 15 |
| 121 | #define XNRES 10 |
| 122 | |
| 123 | struct xresource { |
| 124 | struct resource xres; /* Must be first */ |
| 125 | int xflag; /* 1 == used */ |
| 126 | char xname[XNMLN+1]; |
| 127 | }; |
| 128 | |
| 129 | static struct xresource xresv[XNRES]; |
| 130 | |
| 131 | static struct xresource *xres_alloc(void) |
| 132 | { |
| 133 | struct xresource *xrp; |
| 134 | int n; |
| 135 | |
| 136 | xrp = xresv; |
| 137 | for (n = 0; n < XNRES; n++) { |
| 138 | if (xrp->xflag == 0) { |
| 139 | xrp->xflag = 1; |
| 140 | return xrp; |
| 141 | } |
| 142 | xrp++; |
| 143 | } |
| 144 | return NULL; |
| 145 | } |
| 146 | |
| 147 | static void xres_free(struct xresource *xrp) |
| 148 | { |
| 149 | xrp->xflag = 0; |
| 150 | } |
| 151 | |
| 152 | static struct resource *shmedia_find_resource(struct resource *root, |
| 153 | unsigned long vaddr) |
| 154 | { |
| 155 | struct resource *res; |
| 156 | |
| 157 | for (res = root->child; res; res = res->sibling) |
| 158 | if (res->start <= vaddr && res->end >= vaddr) |
| 159 | return res; |
| 160 | |
| 161 | return NULL; |
| 162 | } |
| 163 | |
| 164 | static unsigned long shmedia_alloc_io(unsigned long phys, unsigned long size, |
| 165 | const char *name) |
| 166 | { |
| 167 | static int printed_full = 0; |
| 168 | struct xresource *xres; |
| 169 | struct resource *res; |
| 170 | char *tack; |
| 171 | int tlen; |
| 172 | |
| 173 | if (name == NULL) name = "???"; |
| 174 | |
| 175 | if ((xres = xres_alloc()) != 0) { |
| 176 | tack = xres->xname; |
| 177 | res = &xres->xres; |
| 178 | } else { |
| 179 | if (!printed_full) { |
| 180 | printk("%s: done with statics, switching to kmalloc\n", |
Harvey Harrison | 866e6b9 | 2008-03-04 15:23:47 -0800 | [diff] [blame] | 181 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | printed_full = 1; |
| 183 | } |
| 184 | tlen = strlen(name); |
| 185 | tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL); |
| 186 | if (!tack) |
| 187 | return -ENOMEM; |
| 188 | memset(tack, 0, sizeof(struct resource)); |
| 189 | res = (struct resource *) tack; |
| 190 | tack += sizeof (struct resource); |
| 191 | } |
| 192 | |
| 193 | strncpy(tack, name, XNMLN); |
| 194 | tack[XNMLN] = 0; |
| 195 | res->name = tack; |
| 196 | |
| 197 | return shmedia_ioremap(res, phys, size); |
| 198 | } |
| 199 | |
| 200 | static unsigned long shmedia_ioremap(struct resource *res, u32 pa, int sz) |
| 201 | { |
| 202 | unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK); |
| 203 | unsigned long round_sz = (offset + sz + PAGE_SIZE-1) & PAGE_MASK; |
| 204 | unsigned long va; |
| 205 | unsigned int psz; |
| 206 | |
| 207 | if (allocate_resource(&shmedia_iomap, res, round_sz, |
| 208 | shmedia_iomap.start, shmedia_iomap.end, |
| 209 | PAGE_SIZE, NULL, NULL) != 0) { |
| 210 | panic("alloc_io_res(%s): cannot occupy\n", |
| 211 | (res->name != NULL)? res->name: "???"); |
| 212 | } |
| 213 | |
| 214 | va = res->start; |
| 215 | pa &= PAGE_MASK; |
| 216 | |
| 217 | psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE; |
| 218 | |
| 219 | /* log at boot time ... */ |
| 220 | printk("mapioaddr: %6s [%2d page%s] va 0x%08lx pa 0x%08x\n", |
| 221 | ((res->name != NULL) ? res->name : "???"), |
| 222 | psz, psz == 1 ? " " : "s", va, pa); |
| 223 | |
| 224 | for (psz = res->end - res->start + 1; psz != 0; psz -= PAGE_SIZE) { |
| 225 | shmedia_mapioaddr(pa, va); |
| 226 | va += PAGE_SIZE; |
| 227 | pa += PAGE_SIZE; |
| 228 | } |
| 229 | |
| 230 | res->start += offset; |
| 231 | res->end = res->start + sz - 1; /* not strictly necessary.. */ |
| 232 | |
| 233 | return res->start; |
| 234 | } |
| 235 | |
| 236 | static void shmedia_free_io(struct resource *res) |
| 237 | { |
| 238 | unsigned long len = res->end - res->start + 1; |
| 239 | |
| 240 | BUG_ON((len & (PAGE_SIZE - 1)) != 0); |
| 241 | |
| 242 | while (len) { |
| 243 | len -= PAGE_SIZE; |
| 244 | shmedia_unmapioaddr(res->start + len); |
| 245 | } |
| 246 | |
| 247 | release_resource(res); |
| 248 | } |
| 249 | |
Paul Mundt | fad9e7d | 2007-07-20 17:46:42 +0900 | [diff] [blame] | 250 | static __init_refok void *sh64_get_page(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
| 252 | extern int after_bootmem; |
| 253 | void *page; |
| 254 | |
| 255 | if (after_bootmem) { |
| 256 | page = (void *)get_zeroed_page(GFP_ATOMIC); |
| 257 | } else { |
| 258 | page = alloc_bootmem_pages(PAGE_SIZE); |
| 259 | } |
| 260 | |
| 261 | if (!page || ((unsigned long)page & ~PAGE_MASK)) |
| 262 | panic("sh64_get_page: Out of memory already?\n"); |
| 263 | |
| 264 | return page; |
| 265 | } |
| 266 | |
| 267 | static void shmedia_mapioaddr(unsigned long pa, unsigned long va) |
| 268 | { |
| 269 | pgd_t *pgdp; |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 270 | pud_t *pudp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | pmd_t *pmdp; |
| 272 | pte_t *ptep, pte; |
| 273 | pgprot_t prot; |
| 274 | unsigned long flags = 1; /* 1 = CB0-1 device */ |
| 275 | |
| 276 | pr_debug("shmedia_mapiopage pa %08lx va %08lx\n", pa, va); |
| 277 | |
| 278 | pgdp = pgd_offset_k(va); |
| 279 | if (pgd_none(*pgdp) || !pgd_present(*pgdp)) { |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 280 | pudp = (pud_t *)sh64_get_page(); |
| 281 | set_pgd(pgdp, __pgd((unsigned long)pudp | _KERNPG_TABLE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 284 | pudp = pud_offset(pgdp, va); |
| 285 | if (pud_none(*pudp) || !pud_present(*pudp)) { |
| 286 | pmdp = (pmd_t *)sh64_get_page(); |
| 287 | set_pud(pudp, __pud((unsigned long)pmdp | _KERNPG_TABLE)); |
| 288 | } |
| 289 | |
| 290 | pmdp = pmd_offset(pudp, va); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | if (pmd_none(*pmdp) || !pmd_present(*pmdp) ) { |
| 292 | ptep = (pte_t *)sh64_get_page(); |
| 293 | set_pmd(pmdp, __pmd((unsigned long)ptep + _PAGE_TABLE)); |
| 294 | } |
| 295 | |
| 296 | prot = __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | |
| 297 | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SHARED | flags); |
| 298 | |
| 299 | pte = pfn_pte(pa >> PAGE_SHIFT, prot); |
| 300 | ptep = pte_offset_kernel(pmdp, va); |
| 301 | |
| 302 | if (!pte_none(*ptep) && |
| 303 | pte_val(*ptep) != pte_val(pte)) |
| 304 | pte_ERROR(*ptep); |
| 305 | |
| 306 | set_pte(ptep, pte); |
| 307 | |
| 308 | flush_tlb_kernel_range(va, PAGE_SIZE); |
| 309 | } |
| 310 | |
| 311 | static void shmedia_unmapioaddr(unsigned long vaddr) |
| 312 | { |
| 313 | pgd_t *pgdp; |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 314 | pud_t *pudp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | pmd_t *pmdp; |
| 316 | pte_t *ptep; |
| 317 | |
| 318 | pgdp = pgd_offset_k(vaddr); |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 319 | if (pgd_none(*pgdp) || pgd_bad(*pgdp)) |
| 320 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Paul Mundt | 249cfea | 2007-11-19 18:26:19 +0900 | [diff] [blame] | 322 | pudp = pud_offset(pgdp, vaddr); |
| 323 | if (pud_none(*pudp) || pud_bad(*pudp)) |
| 324 | return; |
| 325 | |
| 326 | pmdp = pmd_offset(pudp, vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | if (pmd_none(*pmdp) || pmd_bad(*pmdp)) |
| 328 | return; |
| 329 | |
| 330 | ptep = pte_offset_kernel(pmdp, vaddr); |
| 331 | |
| 332 | if (pte_none(*ptep) || !pte_present(*ptep)) |
| 333 | return; |
| 334 | |
| 335 | clear_page((void *)ptep); |
| 336 | pte_clear(&init_mm, vaddr, ptep); |
| 337 | } |
| 338 | |
| 339 | unsigned long onchip_remap(unsigned long phys, unsigned long size, const char *name) |
| 340 | { |
| 341 | if (size < PAGE_SIZE) |
| 342 | size = PAGE_SIZE; |
| 343 | |
| 344 | return shmedia_alloc_io(phys, size, name); |
| 345 | } |
| 346 | |
| 347 | void onchip_unmap(unsigned long vaddr) |
| 348 | { |
| 349 | struct resource *res; |
| 350 | unsigned int psz; |
| 351 | |
| 352 | res = shmedia_find_resource(&shmedia_iomap, vaddr); |
| 353 | if (!res) { |
| 354 | printk(KERN_ERR "%s: Failed to free 0x%08lx\n", |
Harvey Harrison | 866e6b9 | 2008-03-04 15:23:47 -0800 | [diff] [blame] | 355 | __func__, vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | return; |
| 357 | } |
| 358 | |
| 359 | psz = (res->end - res->start + (PAGE_SIZE - 1)) / PAGE_SIZE; |
| 360 | |
| 361 | printk(KERN_DEBUG "unmapioaddr: %6s [%2d page%s] freed\n", |
| 362 | res->name, psz, psz == 1 ? " " : "s"); |
| 363 | |
| 364 | shmedia_free_io(res); |
| 365 | |
| 366 | if ((char *)res >= (char *)xresv && |
| 367 | (char *)res < (char *)&xresv[XNRES]) { |
| 368 | xres_free((struct xresource *)res); |
| 369 | } else { |
| 370 | kfree(res); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | #ifdef CONFIG_PROC_FS |
| 375 | static int |
| 376 | ioremap_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, |
| 377 | void *data) |
| 378 | { |
| 379 | char *p = buf, *e = buf + length; |
| 380 | struct resource *r; |
| 381 | const char *nm; |
| 382 | |
| 383 | for (r = ((struct resource *)data)->child; r != NULL; r = r->sibling) { |
| 384 | if (p + 32 >= e) /* Better than nothing */ |
| 385 | break; |
| 386 | if ((nm = r->name) == 0) nm = "???"; |
Paul Mundt | 2126413 | 2006-09-12 14:36:46 +0900 | [diff] [blame] | 387 | p += sprintf(p, "%08lx-%08lx: %s\n", |
| 388 | (unsigned long)r->start, |
| 389 | (unsigned long)r->end, nm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | return p-buf; |
| 393 | } |
| 394 | #endif /* CONFIG_PROC_FS */ |
| 395 | |
| 396 | static int __init register_proc_onchip(void) |
| 397 | { |
| 398 | #ifdef CONFIG_PROC_FS |
| 399 | create_proc_read_entry("io_map",0,0, ioremap_proc_info, &shmedia_iomap); |
| 400 | #endif |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | __initcall(register_proc_onchip); |