| 1 | /* |
| 2 | * Procedures for creating, accessing and interpreting the device tree. |
| 3 | * |
| 4 | * Paul Mackerras August 1996. |
| 5 | * Copyright (C) 1996-2005 Paul Mackerras. |
| 6 | * |
| 7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
| 8 | * {engebret|bergner}@us.ibm.com |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #undef DEBUG |
| 17 | |
| 18 | #include <stdarg.h> |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/threads.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/pci.h> |
| 27 | #include <linux/stringify.h> |
| 28 | #include <linux/delay.h> |
| 29 | #include <linux/initrd.h> |
| 30 | #include <linux/bitops.h> |
| 31 | #include <linux/module.h> |
| 32 | |
| 33 | #include <asm/prom.h> |
| 34 | #include <asm/rtas.h> |
| 35 | #include <asm/lmb.h> |
| 36 | #include <asm/page.h> |
| 37 | #include <asm/processor.h> |
| 38 | #include <asm/irq.h> |
| 39 | #include <asm/io.h> |
| 40 | #include <asm/smp.h> |
| 41 | #include <asm/system.h> |
| 42 | #include <asm/mmu.h> |
| 43 | #include <asm/pgtable.h> |
| 44 | #include <asm/pci.h> |
| 45 | #include <asm/iommu.h> |
| 46 | #include <asm/btext.h> |
| 47 | #include <asm/sections.h> |
| 48 | #include <asm/machdep.h> |
| 49 | #include <asm/pSeries_reconfig.h> |
| 50 | #include <asm/pci-bridge.h> |
| 51 | #ifdef CONFIG_PPC64 |
| 52 | #include <asm/systemcfg.h> |
| 53 | #endif |
| 54 | |
| 55 | #ifdef DEBUG |
| 56 | #define DBG(fmt...) printk(KERN_ERR fmt) |
| 57 | #else |
| 58 | #define DBG(fmt...) |
| 59 | #endif |
| 60 | |
| 61 | struct pci_reg_property { |
| 62 | struct pci_address addr; |
| 63 | u32 size_hi; |
| 64 | u32 size_lo; |
| 65 | }; |
| 66 | |
| 67 | struct isa_reg_property { |
| 68 | u32 space; |
| 69 | u32 address; |
| 70 | u32 size; |
| 71 | }; |
| 72 | |
| 73 | |
| 74 | typedef int interpret_func(struct device_node *, unsigned long *, |
| 75 | int, int, int); |
| 76 | |
| 77 | extern struct rtas_t rtas; |
| 78 | extern struct lmb lmb; |
| 79 | extern unsigned long klimit; |
| 80 | |
| 81 | static int __initdata dt_root_addr_cells; |
| 82 | static int __initdata dt_root_size_cells; |
| 83 | |
| 84 | #ifdef CONFIG_PPC64 |
| 85 | static int __initdata iommu_is_off; |
| 86 | int __initdata iommu_force_on; |
| 87 | unsigned long tce_alloc_start, tce_alloc_end; |
| 88 | #endif |
| 89 | |
| 90 | typedef u32 cell_t; |
| 91 | |
| 92 | #if 0 |
| 93 | static struct boot_param_header *initial_boot_params __initdata; |
| 94 | #else |
| 95 | struct boot_param_header *initial_boot_params; |
| 96 | #endif |
| 97 | |
| 98 | static struct device_node *allnodes = NULL; |
| 99 | |
| 100 | /* use when traversing tree through the allnext, child, sibling, |
| 101 | * or parent members of struct device_node. |
| 102 | */ |
| 103 | static DEFINE_RWLOCK(devtree_lock); |
| 104 | |
| 105 | /* export that to outside world */ |
| 106 | struct device_node *of_chosen; |
| 107 | |
| 108 | struct device_node *dflt_interrupt_controller; |
| 109 | int num_interrupt_controllers; |
| 110 | |
| 111 | /* |
| 112 | * Wrapper for allocating memory for various data that needs to be |
| 113 | * attached to device nodes as they are processed at boot or when |
| 114 | * added to the device tree later (e.g. DLPAR). At boot there is |
| 115 | * already a region reserved so we just increment *mem_start by size; |
| 116 | * otherwise we call kmalloc. |
| 117 | */ |
| 118 | static void * prom_alloc(unsigned long size, unsigned long *mem_start) |
| 119 | { |
| 120 | unsigned long tmp; |
| 121 | |
| 122 | if (!mem_start) |
| 123 | return kmalloc(size, GFP_KERNEL); |
| 124 | |
| 125 | tmp = *mem_start; |
| 126 | *mem_start += size; |
| 127 | return (void *)tmp; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Find the device_node with a given phandle. |
| 132 | */ |
| 133 | static struct device_node * find_phandle(phandle ph) |
| 134 | { |
| 135 | struct device_node *np; |
| 136 | |
| 137 | for (np = allnodes; np != 0; np = np->allnext) |
| 138 | if (np->linux_phandle == ph) |
| 139 | return np; |
| 140 | return NULL; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Find the interrupt parent of a node. |
| 145 | */ |
| 146 | static struct device_node * __devinit intr_parent(struct device_node *p) |
| 147 | { |
| 148 | phandle *parp; |
| 149 | |
| 150 | parp = (phandle *) get_property(p, "interrupt-parent", NULL); |
| 151 | if (parp == NULL) |
| 152 | return p->parent; |
| 153 | p = find_phandle(*parp); |
| 154 | if (p != NULL) |
| 155 | return p; |
| 156 | /* |
| 157 | * On a powermac booted with BootX, we don't get to know the |
| 158 | * phandles for any nodes, so find_phandle will return NULL. |
| 159 | * Fortunately these machines only have one interrupt controller |
| 160 | * so there isn't in fact any ambiguity. -- paulus |
| 161 | */ |
| 162 | if (num_interrupt_controllers == 1) |
| 163 | p = dflt_interrupt_controller; |
| 164 | return p; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Find out the size of each entry of the interrupts property |
| 169 | * for a node. |
| 170 | */ |
| 171 | int __devinit prom_n_intr_cells(struct device_node *np) |
| 172 | { |
| 173 | struct device_node *p; |
| 174 | unsigned int *icp; |
| 175 | |
| 176 | for (p = np; (p = intr_parent(p)) != NULL; ) { |
| 177 | icp = (unsigned int *) |
| 178 | get_property(p, "#interrupt-cells", NULL); |
| 179 | if (icp != NULL) |
| 180 | return *icp; |
| 181 | if (get_property(p, "interrupt-controller", NULL) != NULL |
| 182 | || get_property(p, "interrupt-map", NULL) != NULL) { |
| 183 | printk("oops, node %s doesn't have #interrupt-cells\n", |
| 184 | p->full_name); |
| 185 | return 1; |
| 186 | } |
| 187 | } |
| 188 | #ifdef DEBUG_IRQ |
| 189 | printk("prom_n_intr_cells failed for %s\n", np->full_name); |
| 190 | #endif |
| 191 | return 1; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Map an interrupt from a device up to the platform interrupt |
| 196 | * descriptor. |
| 197 | */ |
| 198 | static int __devinit map_interrupt(unsigned int **irq, struct device_node **ictrler, |
| 199 | struct device_node *np, unsigned int *ints, |
| 200 | int nintrc) |
| 201 | { |
| 202 | struct device_node *p, *ipar; |
| 203 | unsigned int *imap, *imask, *ip; |
| 204 | int i, imaplen, match; |
| 205 | int newintrc = 0, newaddrc = 0; |
| 206 | unsigned int *reg; |
| 207 | int naddrc; |
| 208 | |
| 209 | reg = (unsigned int *) get_property(np, "reg", NULL); |
| 210 | naddrc = prom_n_addr_cells(np); |
| 211 | p = intr_parent(np); |
| 212 | while (p != NULL) { |
| 213 | if (get_property(p, "interrupt-controller", NULL) != NULL) |
| 214 | /* this node is an interrupt controller, stop here */ |
| 215 | break; |
| 216 | imap = (unsigned int *) |
| 217 | get_property(p, "interrupt-map", &imaplen); |
| 218 | if (imap == NULL) { |
| 219 | p = intr_parent(p); |
| 220 | continue; |
| 221 | } |
| 222 | imask = (unsigned int *) |
| 223 | get_property(p, "interrupt-map-mask", NULL); |
| 224 | if (imask == NULL) { |
| 225 | printk("oops, %s has interrupt-map but no mask\n", |
| 226 | p->full_name); |
| 227 | return 0; |
| 228 | } |
| 229 | imaplen /= sizeof(unsigned int); |
| 230 | match = 0; |
| 231 | ipar = NULL; |
| 232 | while (imaplen > 0 && !match) { |
| 233 | /* check the child-interrupt field */ |
| 234 | match = 1; |
| 235 | for (i = 0; i < naddrc && match; ++i) |
| 236 | match = ((reg[i] ^ imap[i]) & imask[i]) == 0; |
| 237 | for (; i < naddrc + nintrc && match; ++i) |
| 238 | match = ((ints[i-naddrc] ^ imap[i]) & imask[i]) == 0; |
| 239 | imap += naddrc + nintrc; |
| 240 | imaplen -= naddrc + nintrc; |
| 241 | /* grab the interrupt parent */ |
| 242 | ipar = find_phandle((phandle) *imap++); |
| 243 | --imaplen; |
| 244 | if (ipar == NULL && num_interrupt_controllers == 1) |
| 245 | /* cope with BootX not giving us phandles */ |
| 246 | ipar = dflt_interrupt_controller; |
| 247 | if (ipar == NULL) { |
| 248 | printk("oops, no int parent %x in map of %s\n", |
| 249 | imap[-1], p->full_name); |
| 250 | return 0; |
| 251 | } |
| 252 | /* find the parent's # addr and intr cells */ |
| 253 | ip = (unsigned int *) |
| 254 | get_property(ipar, "#interrupt-cells", NULL); |
| 255 | if (ip == NULL) { |
| 256 | printk("oops, no #interrupt-cells on %s\n", |
| 257 | ipar->full_name); |
| 258 | return 0; |
| 259 | } |
| 260 | newintrc = *ip; |
| 261 | ip = (unsigned int *) |
| 262 | get_property(ipar, "#address-cells", NULL); |
| 263 | newaddrc = (ip == NULL)? 0: *ip; |
| 264 | imap += newaddrc + newintrc; |
| 265 | imaplen -= newaddrc + newintrc; |
| 266 | } |
| 267 | if (imaplen < 0) { |
| 268 | printk("oops, error decoding int-map on %s, len=%d\n", |
| 269 | p->full_name, imaplen); |
| 270 | return 0; |
| 271 | } |
| 272 | if (!match) { |
| 273 | #ifdef DEBUG_IRQ |
| 274 | printk("oops, no match in %s int-map for %s\n", |
| 275 | p->full_name, np->full_name); |
| 276 | #endif |
| 277 | return 0; |
| 278 | } |
| 279 | p = ipar; |
| 280 | naddrc = newaddrc; |
| 281 | nintrc = newintrc; |
| 282 | ints = imap - nintrc; |
| 283 | reg = ints - naddrc; |
| 284 | } |
| 285 | if (p == NULL) { |
| 286 | #ifdef DEBUG_IRQ |
| 287 | printk("hmmm, int tree for %s doesn't have ctrler\n", |
| 288 | np->full_name); |
| 289 | #endif |
| 290 | return 0; |
| 291 | } |
| 292 | *irq = ints; |
| 293 | *ictrler = p; |
| 294 | return nintrc; |
| 295 | } |
| 296 | |
| 297 | static unsigned char map_isa_senses[4] = { |
| 298 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, |
| 299 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, |
| 300 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, |
| 301 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE |
| 302 | }; |
| 303 | |
| 304 | static unsigned char map_mpic_senses[4] = { |
| 305 | IRQ_SENSE_EDGE | IRQ_POLARITY_POSITIVE, |
| 306 | IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, |
| 307 | /* 2 seems to be used for the 8259 cascade... */ |
| 308 | IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, |
| 309 | IRQ_SENSE_EDGE | IRQ_POLARITY_NEGATIVE, |
| 310 | }; |
| 311 | |
| 312 | static int __devinit finish_node_interrupts(struct device_node *np, |
| 313 | unsigned long *mem_start, |
| 314 | int measure_only) |
| 315 | { |
| 316 | unsigned int *ints; |
| 317 | int intlen, intrcells, intrcount; |
| 318 | int i, j, n, sense; |
| 319 | unsigned int *irq, virq; |
| 320 | struct device_node *ic; |
| 321 | |
| 322 | if (num_interrupt_controllers == 0) { |
| 323 | /* |
| 324 | * Old machines just have a list of interrupt numbers |
| 325 | * and no interrupt-controller nodes. |
| 326 | */ |
| 327 | ints = (unsigned int *) get_property(np, "AAPL,interrupts", |
| 328 | &intlen); |
| 329 | /* XXX old interpret_pci_props looked in parent too */ |
| 330 | /* XXX old interpret_macio_props looked for interrupts |
| 331 | before AAPL,interrupts */ |
| 332 | if (ints == NULL) |
| 333 | ints = (unsigned int *) get_property(np, "interrupts", |
| 334 | &intlen); |
| 335 | if (ints == NULL) |
| 336 | return 0; |
| 337 | |
| 338 | np->n_intrs = intlen / sizeof(unsigned int); |
| 339 | np->intrs = prom_alloc(np->n_intrs * sizeof(np->intrs[0]), |
| 340 | mem_start); |
| 341 | if (!np->intrs) |
| 342 | return -ENOMEM; |
| 343 | if (measure_only) |
| 344 | return 0; |
| 345 | |
| 346 | for (i = 0; i < np->n_intrs; ++i) { |
| 347 | np->intrs[i].line = *ints++; |
| 348 | np->intrs[i].sense = IRQ_SENSE_LEVEL |
| 349 | | IRQ_POLARITY_NEGATIVE; |
| 350 | } |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | ints = (unsigned int *) get_property(np, "interrupts", &intlen); |
| 355 | if (ints == NULL) |
| 356 | return 0; |
| 357 | intrcells = prom_n_intr_cells(np); |
| 358 | intlen /= intrcells * sizeof(unsigned int); |
| 359 | |
| 360 | np->intrs = prom_alloc(intlen * sizeof(*(np->intrs)), mem_start); |
| 361 | if (!np->intrs) |
| 362 | return -ENOMEM; |
| 363 | |
| 364 | if (measure_only) |
| 365 | return 0; |
| 366 | |
| 367 | intrcount = 0; |
| 368 | for (i = 0; i < intlen; ++i, ints += intrcells) { |
| 369 | n = map_interrupt(&irq, &ic, np, ints, intrcells); |
| 370 | if (n <= 0) |
| 371 | continue; |
| 372 | |
| 373 | /* don't map IRQ numbers under a cascaded 8259 controller */ |
| 374 | if (ic && device_is_compatible(ic, "chrp,iic")) { |
| 375 | np->intrs[intrcount].line = irq[0]; |
| 376 | sense = (n > 1)? (irq[1] & 3): 3; |
| 377 | np->intrs[intrcount].sense = map_isa_senses[sense]; |
| 378 | } else { |
| 379 | virq = virt_irq_create_mapping(irq[0]); |
| 380 | #ifdef CONFIG_PPC64 |
| 381 | if (virq == NO_IRQ) { |
| 382 | printk(KERN_CRIT "Could not allocate interrupt" |
| 383 | " number for %s\n", np->full_name); |
| 384 | continue; |
| 385 | } |
| 386 | #endif |
| 387 | np->intrs[intrcount].line = irq_offset_up(virq); |
| 388 | sense = (n > 1)? (irq[1] & 3): 1; |
| 389 | np->intrs[intrcount].sense = map_mpic_senses[sense]; |
| 390 | } |
| 391 | |
| 392 | #ifdef CONFIG_PPC64 |
| 393 | /* We offset irq numbers for the u3 MPIC by 128 in PowerMac */ |
| 394 | if (systemcfg->platform == PLATFORM_POWERMAC && ic && ic->parent) { |
| 395 | char *name = get_property(ic->parent, "name", NULL); |
| 396 | if (name && !strcmp(name, "u3")) |
| 397 | np->intrs[intrcount].line += 128; |
| 398 | else if (!(name && !strcmp(name, "mac-io"))) |
| 399 | /* ignore other cascaded controllers, such as |
| 400 | the k2-sata-root */ |
| 401 | break; |
| 402 | } |
| 403 | #endif |
| 404 | if (n > 2) { |
| 405 | printk("hmmm, got %d intr cells for %s:", n, |
| 406 | np->full_name); |
| 407 | for (j = 0; j < n; ++j) |
| 408 | printk(" %d", irq[j]); |
| 409 | printk("\n"); |
| 410 | } |
| 411 | ++intrcount; |
| 412 | } |
| 413 | np->n_intrs = intrcount; |
| 414 | |
| 415 | return 0; |
| 416 | } |
| 417 | |
| 418 | static int __devinit interpret_pci_props(struct device_node *np, |
| 419 | unsigned long *mem_start, |
| 420 | int naddrc, int nsizec, |
| 421 | int measure_only) |
| 422 | { |
| 423 | struct address_range *adr; |
| 424 | struct pci_reg_property *pci_addrs; |
| 425 | int i, l, n_addrs; |
| 426 | |
| 427 | pci_addrs = (struct pci_reg_property *) |
| 428 | get_property(np, "assigned-addresses", &l); |
| 429 | if (!pci_addrs) |
| 430 | return 0; |
| 431 | |
| 432 | n_addrs = l / sizeof(*pci_addrs); |
| 433 | |
| 434 | adr = prom_alloc(n_addrs * sizeof(*adr), mem_start); |
| 435 | if (!adr) |
| 436 | return -ENOMEM; |
| 437 | |
| 438 | if (measure_only) |
| 439 | return 0; |
| 440 | |
| 441 | np->addrs = adr; |
| 442 | np->n_addrs = n_addrs; |
| 443 | |
| 444 | for (i = 0; i < n_addrs; i++) { |
| 445 | adr[i].space = pci_addrs[i].addr.a_hi; |
| 446 | adr[i].address = pci_addrs[i].addr.a_lo | |
| 447 | ((u64)pci_addrs[i].addr.a_mid << 32); |
| 448 | adr[i].size = pci_addrs[i].size_lo; |
| 449 | } |
| 450 | |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static int __init interpret_dbdma_props(struct device_node *np, |
| 455 | unsigned long *mem_start, |
| 456 | int naddrc, int nsizec, |
| 457 | int measure_only) |
| 458 | { |
| 459 | struct reg_property32 *rp; |
| 460 | struct address_range *adr; |
| 461 | unsigned long base_address; |
| 462 | int i, l; |
| 463 | struct device_node *db; |
| 464 | |
| 465 | base_address = 0; |
| 466 | if (!measure_only) { |
| 467 | for (db = np->parent; db != NULL; db = db->parent) { |
| 468 | if (!strcmp(db->type, "dbdma") && db->n_addrs != 0) { |
| 469 | base_address = db->addrs[0].address; |
| 470 | break; |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | rp = (struct reg_property32 *) get_property(np, "reg", &l); |
| 476 | if (rp != 0 && l >= sizeof(struct reg_property32)) { |
| 477 | i = 0; |
| 478 | adr = (struct address_range *) (*mem_start); |
| 479 | while ((l -= sizeof(struct reg_property32)) >= 0) { |
| 480 | if (!measure_only) { |
| 481 | adr[i].space = 2; |
| 482 | adr[i].address = rp[i].address + base_address; |
| 483 | adr[i].size = rp[i].size; |
| 484 | } |
| 485 | ++i; |
| 486 | } |
| 487 | np->addrs = adr; |
| 488 | np->n_addrs = i; |
| 489 | (*mem_start) += i * sizeof(struct address_range); |
| 490 | } |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | static int __init interpret_macio_props(struct device_node *np, |
| 496 | unsigned long *mem_start, |
| 497 | int naddrc, int nsizec, |
| 498 | int measure_only) |
| 499 | { |
| 500 | struct reg_property32 *rp; |
| 501 | struct address_range *adr; |
| 502 | unsigned long base_address; |
| 503 | int i, l; |
| 504 | struct device_node *db; |
| 505 | |
| 506 | base_address = 0; |
| 507 | if (!measure_only) { |
| 508 | for (db = np->parent; db != NULL; db = db->parent) { |
| 509 | if (!strcmp(db->type, "mac-io") && db->n_addrs != 0) { |
| 510 | base_address = db->addrs[0].address; |
| 511 | break; |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | rp = (struct reg_property32 *) get_property(np, "reg", &l); |
| 517 | if (rp != 0 && l >= sizeof(struct reg_property32)) { |
| 518 | i = 0; |
| 519 | adr = (struct address_range *) (*mem_start); |
| 520 | while ((l -= sizeof(struct reg_property32)) >= 0) { |
| 521 | if (!measure_only) { |
| 522 | adr[i].space = 2; |
| 523 | adr[i].address = rp[i].address + base_address; |
| 524 | adr[i].size = rp[i].size; |
| 525 | } |
| 526 | ++i; |
| 527 | } |
| 528 | np->addrs = adr; |
| 529 | np->n_addrs = i; |
| 530 | (*mem_start) += i * sizeof(struct address_range); |
| 531 | } |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static int __init interpret_isa_props(struct device_node *np, |
| 537 | unsigned long *mem_start, |
| 538 | int naddrc, int nsizec, |
| 539 | int measure_only) |
| 540 | { |
| 541 | struct isa_reg_property *rp; |
| 542 | struct address_range *adr; |
| 543 | int i, l; |
| 544 | |
| 545 | rp = (struct isa_reg_property *) get_property(np, "reg", &l); |
| 546 | if (rp != 0 && l >= sizeof(struct isa_reg_property)) { |
| 547 | i = 0; |
| 548 | adr = (struct address_range *) (*mem_start); |
| 549 | while ((l -= sizeof(struct isa_reg_property)) >= 0) { |
| 550 | if (!measure_only) { |
| 551 | adr[i].space = rp[i].space; |
| 552 | adr[i].address = rp[i].address; |
| 553 | adr[i].size = rp[i].size; |
| 554 | } |
| 555 | ++i; |
| 556 | } |
| 557 | np->addrs = adr; |
| 558 | np->n_addrs = i; |
| 559 | (*mem_start) += i * sizeof(struct address_range); |
| 560 | } |
| 561 | |
| 562 | return 0; |
| 563 | } |
| 564 | |
| 565 | static int __init interpret_root_props(struct device_node *np, |
| 566 | unsigned long *mem_start, |
| 567 | int naddrc, int nsizec, |
| 568 | int measure_only) |
| 569 | { |
| 570 | struct address_range *adr; |
| 571 | int i, l; |
| 572 | unsigned int *rp; |
| 573 | int rpsize = (naddrc + nsizec) * sizeof(unsigned int); |
| 574 | |
| 575 | rp = (unsigned int *) get_property(np, "reg", &l); |
| 576 | if (rp != 0 && l >= rpsize) { |
| 577 | i = 0; |
| 578 | adr = (struct address_range *) (*mem_start); |
| 579 | while ((l -= rpsize) >= 0) { |
| 580 | if (!measure_only) { |
| 581 | adr[i].space = 0; |
| 582 | adr[i].address = rp[naddrc - 1]; |
| 583 | adr[i].size = rp[naddrc + nsizec - 1]; |
| 584 | } |
| 585 | ++i; |
| 586 | rp += naddrc + nsizec; |
| 587 | } |
| 588 | np->addrs = adr; |
| 589 | np->n_addrs = i; |
| 590 | (*mem_start) += i * sizeof(struct address_range); |
| 591 | } |
| 592 | |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static int __devinit finish_node(struct device_node *np, |
| 597 | unsigned long *mem_start, |
| 598 | interpret_func *ifunc, |
| 599 | int naddrc, int nsizec, |
| 600 | int measure_only) |
| 601 | { |
| 602 | struct device_node *child; |
| 603 | int *ip, rc = 0; |
| 604 | |
| 605 | /* get the device addresses and interrupts */ |
| 606 | if (ifunc != NULL) |
| 607 | rc = ifunc(np, mem_start, naddrc, nsizec, measure_only); |
| 608 | if (rc) |
| 609 | goto out; |
| 610 | |
| 611 | rc = finish_node_interrupts(np, mem_start, measure_only); |
| 612 | if (rc) |
| 613 | goto out; |
| 614 | |
| 615 | /* Look for #address-cells and #size-cells properties. */ |
| 616 | ip = (int *) get_property(np, "#address-cells", NULL); |
| 617 | if (ip != NULL) |
| 618 | naddrc = *ip; |
| 619 | ip = (int *) get_property(np, "#size-cells", NULL); |
| 620 | if (ip != NULL) |
| 621 | nsizec = *ip; |
| 622 | |
| 623 | if (!strcmp(np->name, "device-tree") || np->parent == NULL) |
| 624 | ifunc = interpret_root_props; |
| 625 | else if (np->type == 0) |
| 626 | ifunc = NULL; |
| 627 | else if (!strcmp(np->type, "pci") || !strcmp(np->type, "vci")) |
| 628 | ifunc = interpret_pci_props; |
| 629 | else if (!strcmp(np->type, "dbdma")) |
| 630 | ifunc = interpret_dbdma_props; |
| 631 | else if (!strcmp(np->type, "mac-io") || ifunc == interpret_macio_props) |
| 632 | ifunc = interpret_macio_props; |
| 633 | else if (!strcmp(np->type, "isa")) |
| 634 | ifunc = interpret_isa_props; |
| 635 | else if (!strcmp(np->name, "uni-n") || !strcmp(np->name, "u3")) |
| 636 | ifunc = interpret_root_props; |
| 637 | else if (!((ifunc == interpret_dbdma_props |
| 638 | || ifunc == interpret_macio_props) |
| 639 | && (!strcmp(np->type, "escc") |
| 640 | || !strcmp(np->type, "media-bay")))) |
| 641 | ifunc = NULL; |
| 642 | |
| 643 | for (child = np->child; child != NULL; child = child->sibling) { |
| 644 | rc = finish_node(child, mem_start, ifunc, |
| 645 | naddrc, nsizec, measure_only); |
| 646 | if (rc) |
| 647 | goto out; |
| 648 | } |
| 649 | out: |
| 650 | return rc; |
| 651 | } |
| 652 | |
| 653 | static void __init scan_interrupt_controllers(void) |
| 654 | { |
| 655 | struct device_node *np; |
| 656 | int n = 0; |
| 657 | char *name, *ic; |
| 658 | int iclen; |
| 659 | |
| 660 | for (np = allnodes; np != NULL; np = np->allnext) { |
| 661 | ic = get_property(np, "interrupt-controller", &iclen); |
| 662 | name = get_property(np, "name", NULL); |
| 663 | /* checking iclen makes sure we don't get a false |
| 664 | match on /chosen.interrupt_controller */ |
| 665 | if ((name != NULL |
| 666 | && strcmp(name, "interrupt-controller") == 0) |
| 667 | || (ic != NULL && iclen == 0 |
| 668 | && strcmp(name, "AppleKiwi"))) { |
| 669 | if (n == 0) |
| 670 | dflt_interrupt_controller = np; |
| 671 | ++n; |
| 672 | } |
| 673 | } |
| 674 | num_interrupt_controllers = n; |
| 675 | } |
| 676 | |
| 677 | /** |
| 678 | * finish_device_tree is called once things are running normally |
| 679 | * (i.e. with text and data mapped to the address they were linked at). |
| 680 | * It traverses the device tree and fills in some of the additional, |
| 681 | * fields in each node like {n_}addrs and {n_}intrs, the virt interrupt |
| 682 | * mapping is also initialized at this point. |
| 683 | */ |
| 684 | void __init finish_device_tree(void) |
| 685 | { |
| 686 | unsigned long start, end, size = 0; |
| 687 | |
| 688 | DBG(" -> finish_device_tree\n"); |
| 689 | |
| 690 | #ifdef CONFIG_PPC64 |
| 691 | /* Initialize virtual IRQ map */ |
| 692 | virt_irq_init(); |
| 693 | #endif |
| 694 | scan_interrupt_controllers(); |
| 695 | |
| 696 | /* |
| 697 | * Finish device-tree (pre-parsing some properties etc...) |
| 698 | * We do this in 2 passes. One with "measure_only" set, which |
| 699 | * will only measure the amount of memory needed, then we can |
| 700 | * allocate that memory, and call finish_node again. However, |
| 701 | * we must be careful as most routines will fail nowadays when |
| 702 | * prom_alloc() returns 0, so we must make sure our first pass |
| 703 | * doesn't start at 0. We pre-initialize size to 16 for that |
| 704 | * reason and then remove those additional 16 bytes |
| 705 | */ |
| 706 | size = 16; |
| 707 | finish_node(allnodes, &size, NULL, 0, 0, 1); |
| 708 | size -= 16; |
| 709 | end = start = (unsigned long) __va(lmb_alloc(size, 128)); |
| 710 | finish_node(allnodes, &end, NULL, 0, 0, 0); |
| 711 | BUG_ON(end != start + size); |
| 712 | |
| 713 | DBG(" <- finish_device_tree\n"); |
| 714 | } |
| 715 | |
| 716 | static inline char *find_flat_dt_string(u32 offset) |
| 717 | { |
| 718 | return ((char *)initial_boot_params) + |
| 719 | initial_boot_params->off_dt_strings + offset; |
| 720 | } |
| 721 | |
| 722 | /** |
| 723 | * This function is used to scan the flattened device-tree, it is |
| 724 | * used to extract the memory informations at boot before we can |
| 725 | * unflatten the tree |
| 726 | */ |
| 727 | int __init of_scan_flat_dt(int (*it)(unsigned long node, |
| 728 | const char *uname, int depth, |
| 729 | void *data), |
| 730 | void *data) |
| 731 | { |
| 732 | unsigned long p = ((unsigned long)initial_boot_params) + |
| 733 | initial_boot_params->off_dt_struct; |
| 734 | int rc = 0; |
| 735 | int depth = -1; |
| 736 | |
| 737 | do { |
| 738 | u32 tag = *((u32 *)p); |
| 739 | char *pathp; |
| 740 | |
| 741 | p += 4; |
| 742 | if (tag == OF_DT_END_NODE) { |
| 743 | depth --; |
| 744 | continue; |
| 745 | } |
| 746 | if (tag == OF_DT_NOP) |
| 747 | continue; |
| 748 | if (tag == OF_DT_END) |
| 749 | break; |
| 750 | if (tag == OF_DT_PROP) { |
| 751 | u32 sz = *((u32 *)p); |
| 752 | p += 8; |
| 753 | if (initial_boot_params->version < 0x10) |
| 754 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
| 755 | p += sz; |
| 756 | p = _ALIGN(p, 4); |
| 757 | continue; |
| 758 | } |
| 759 | if (tag != OF_DT_BEGIN_NODE) { |
| 760 | printk(KERN_WARNING "Invalid tag %x scanning flattened" |
| 761 | " device tree !\n", tag); |
| 762 | return -EINVAL; |
| 763 | } |
| 764 | depth++; |
| 765 | pathp = (char *)p; |
| 766 | p = _ALIGN(p + strlen(pathp) + 1, 4); |
| 767 | if ((*pathp) == '/') { |
| 768 | char *lp, *np; |
| 769 | for (lp = NULL, np = pathp; *np; np++) |
| 770 | if ((*np) == '/') |
| 771 | lp = np+1; |
| 772 | if (lp != NULL) |
| 773 | pathp = lp; |
| 774 | } |
| 775 | rc = it(p, pathp, depth, data); |
| 776 | if (rc != 0) |
| 777 | break; |
| 778 | } while(1); |
| 779 | |
| 780 | return rc; |
| 781 | } |
| 782 | |
| 783 | /** |
| 784 | * This function can be used within scan_flattened_dt callback to get |
| 785 | * access to properties |
| 786 | */ |
| 787 | void* __init of_get_flat_dt_prop(unsigned long node, const char *name, |
| 788 | unsigned long *size) |
| 789 | { |
| 790 | unsigned long p = node; |
| 791 | |
| 792 | do { |
| 793 | u32 tag = *((u32 *)p); |
| 794 | u32 sz, noff; |
| 795 | const char *nstr; |
| 796 | |
| 797 | p += 4; |
| 798 | if (tag == OF_DT_NOP) |
| 799 | continue; |
| 800 | if (tag != OF_DT_PROP) |
| 801 | return NULL; |
| 802 | |
| 803 | sz = *((u32 *)p); |
| 804 | noff = *((u32 *)(p + 4)); |
| 805 | p += 8; |
| 806 | if (initial_boot_params->version < 0x10) |
| 807 | p = _ALIGN(p, sz >= 8 ? 8 : 4); |
| 808 | |
| 809 | nstr = find_flat_dt_string(noff); |
| 810 | if (nstr == NULL) { |
| 811 | printk(KERN_WARNING "Can't find property index" |
| 812 | " name !\n"); |
| 813 | return NULL; |
| 814 | } |
| 815 | if (strcmp(name, nstr) == 0) { |
| 816 | if (size) |
| 817 | *size = sz; |
| 818 | return (void *)p; |
| 819 | } |
| 820 | p += sz; |
| 821 | p = _ALIGN(p, 4); |
| 822 | } while(1); |
| 823 | } |
| 824 | |
| 825 | static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
| 826 | unsigned long align) |
| 827 | { |
| 828 | void *res; |
| 829 | |
| 830 | *mem = _ALIGN(*mem, align); |
| 831 | res = (void *)*mem; |
| 832 | *mem += size; |
| 833 | |
| 834 | return res; |
| 835 | } |
| 836 | |
| 837 | static unsigned long __init unflatten_dt_node(unsigned long mem, |
| 838 | unsigned long *p, |
| 839 | struct device_node *dad, |
| 840 | struct device_node ***allnextpp, |
| 841 | unsigned long fpsize) |
| 842 | { |
| 843 | struct device_node *np; |
| 844 | struct property *pp, **prev_pp = NULL; |
| 845 | char *pathp; |
| 846 | u32 tag; |
| 847 | unsigned int l, allocl; |
| 848 | int has_name = 0; |
| 849 | int new_format = 0; |
| 850 | |
| 851 | tag = *((u32 *)(*p)); |
| 852 | if (tag != OF_DT_BEGIN_NODE) { |
| 853 | printk("Weird tag at start of node: %x\n", tag); |
| 854 | return mem; |
| 855 | } |
| 856 | *p += 4; |
| 857 | pathp = (char *)*p; |
| 858 | l = allocl = strlen(pathp) + 1; |
| 859 | *p = _ALIGN(*p + l, 4); |
| 860 | |
| 861 | /* version 0x10 has a more compact unit name here instead of the full |
| 862 | * path. we accumulate the full path size using "fpsize", we'll rebuild |
| 863 | * it later. We detect this because the first character of the name is |
| 864 | * not '/'. |
| 865 | */ |
| 866 | if ((*pathp) != '/') { |
| 867 | new_format = 1; |
| 868 | if (fpsize == 0) { |
| 869 | /* root node: special case. fpsize accounts for path |
| 870 | * plus terminating zero. root node only has '/', so |
| 871 | * fpsize should be 2, but we want to avoid the first |
| 872 | * level nodes to have two '/' so we use fpsize 1 here |
| 873 | */ |
| 874 | fpsize = 1; |
| 875 | allocl = 2; |
| 876 | } else { |
| 877 | /* account for '/' and path size minus terminal 0 |
| 878 | * already in 'l' |
| 879 | */ |
| 880 | fpsize += l; |
| 881 | allocl = fpsize; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | |
| 886 | np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, |
| 887 | __alignof__(struct device_node)); |
| 888 | if (allnextpp) { |
| 889 | memset(np, 0, sizeof(*np)); |
| 890 | np->full_name = ((char*)np) + sizeof(struct device_node); |
| 891 | if (new_format) { |
| 892 | char *p = np->full_name; |
| 893 | /* rebuild full path for new format */ |
| 894 | if (dad && dad->parent) { |
| 895 | strcpy(p, dad->full_name); |
| 896 | #ifdef DEBUG |
| 897 | if ((strlen(p) + l + 1) != allocl) { |
| 898 | DBG("%s: p: %d, l: %d, a: %d\n", |
| 899 | pathp, strlen(p), l, allocl); |
| 900 | } |
| 901 | #endif |
| 902 | p += strlen(p); |
| 903 | } |
| 904 | *(p++) = '/'; |
| 905 | memcpy(p, pathp, l); |
| 906 | } else |
| 907 | memcpy(np->full_name, pathp, l); |
| 908 | prev_pp = &np->properties; |
| 909 | **allnextpp = np; |
| 910 | *allnextpp = &np->allnext; |
| 911 | if (dad != NULL) { |
| 912 | np->parent = dad; |
| 913 | /* we temporarily use the next field as `last_child'*/ |
| 914 | if (dad->next == 0) |
| 915 | dad->child = np; |
| 916 | else |
| 917 | dad->next->sibling = np; |
| 918 | dad->next = np; |
| 919 | } |
| 920 | kref_init(&np->kref); |
| 921 | } |
| 922 | while(1) { |
| 923 | u32 sz, noff; |
| 924 | char *pname; |
| 925 | |
| 926 | tag = *((u32 *)(*p)); |
| 927 | if (tag == OF_DT_NOP) { |
| 928 | *p += 4; |
| 929 | continue; |
| 930 | } |
| 931 | if (tag != OF_DT_PROP) |
| 932 | break; |
| 933 | *p += 4; |
| 934 | sz = *((u32 *)(*p)); |
| 935 | noff = *((u32 *)((*p) + 4)); |
| 936 | *p += 8; |
| 937 | if (initial_boot_params->version < 0x10) |
| 938 | *p = _ALIGN(*p, sz >= 8 ? 8 : 4); |
| 939 | |
| 940 | pname = find_flat_dt_string(noff); |
| 941 | if (pname == NULL) { |
| 942 | printk("Can't find property name in list !\n"); |
| 943 | break; |
| 944 | } |
| 945 | if (strcmp(pname, "name") == 0) |
| 946 | has_name = 1; |
| 947 | l = strlen(pname) + 1; |
| 948 | pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
| 949 | __alignof__(struct property)); |
| 950 | if (allnextpp) { |
| 951 | if (strcmp(pname, "linux,phandle") == 0) { |
| 952 | np->node = *((u32 *)*p); |
| 953 | if (np->linux_phandle == 0) |
| 954 | np->linux_phandle = np->node; |
| 955 | } |
| 956 | if (strcmp(pname, "ibm,phandle") == 0) |
| 957 | np->linux_phandle = *((u32 *)*p); |
| 958 | pp->name = pname; |
| 959 | pp->length = sz; |
| 960 | pp->value = (void *)*p; |
| 961 | *prev_pp = pp; |
| 962 | prev_pp = &pp->next; |
| 963 | } |
| 964 | *p = _ALIGN((*p) + sz, 4); |
| 965 | } |
| 966 | /* with version 0x10 we may not have the name property, recreate |
| 967 | * it here from the unit name if absent |
| 968 | */ |
| 969 | if (!has_name) { |
| 970 | char *p = pathp, *ps = pathp, *pa = NULL; |
| 971 | int sz; |
| 972 | |
| 973 | while (*p) { |
| 974 | if ((*p) == '@') |
| 975 | pa = p; |
| 976 | if ((*p) == '/') |
| 977 | ps = p + 1; |
| 978 | p++; |
| 979 | } |
| 980 | if (pa < ps) |
| 981 | pa = p; |
| 982 | sz = (pa - ps) + 1; |
| 983 | pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, |
| 984 | __alignof__(struct property)); |
| 985 | if (allnextpp) { |
| 986 | pp->name = "name"; |
| 987 | pp->length = sz; |
| 988 | pp->value = (unsigned char *)(pp + 1); |
| 989 | *prev_pp = pp; |
| 990 | prev_pp = &pp->next; |
| 991 | memcpy(pp->value, ps, sz - 1); |
| 992 | ((char *)pp->value)[sz - 1] = 0; |
| 993 | DBG("fixed up name for %s -> %s\n", pathp, pp->value); |
| 994 | } |
| 995 | } |
| 996 | if (allnextpp) { |
| 997 | *prev_pp = NULL; |
| 998 | np->name = get_property(np, "name", NULL); |
| 999 | np->type = get_property(np, "device_type", NULL); |
| 1000 | |
| 1001 | if (!np->name) |
| 1002 | np->name = "<NULL>"; |
| 1003 | if (!np->type) |
| 1004 | np->type = "<NULL>"; |
| 1005 | } |
| 1006 | while (tag == OF_DT_BEGIN_NODE) { |
| 1007 | mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize); |
| 1008 | tag = *((u32 *)(*p)); |
| 1009 | } |
| 1010 | if (tag != OF_DT_END_NODE) { |
| 1011 | printk("Weird tag at end of node: %x\n", tag); |
| 1012 | return mem; |
| 1013 | } |
| 1014 | *p += 4; |
| 1015 | return mem; |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | /** |
| 1020 | * unflattens the device-tree passed by the firmware, creating the |
| 1021 | * tree of struct device_node. It also fills the "name" and "type" |
| 1022 | * pointers of the nodes so the normal device-tree walking functions |
| 1023 | * can be used (this used to be done by finish_device_tree) |
| 1024 | */ |
| 1025 | void __init unflatten_device_tree(void) |
| 1026 | { |
| 1027 | unsigned long start, mem, size; |
| 1028 | struct device_node **allnextp = &allnodes; |
| 1029 | char *p = NULL; |
| 1030 | int l = 0; |
| 1031 | |
| 1032 | DBG(" -> unflatten_device_tree()\n"); |
| 1033 | |
| 1034 | /* First pass, scan for size */ |
| 1035 | start = ((unsigned long)initial_boot_params) + |
| 1036 | initial_boot_params->off_dt_struct; |
| 1037 | size = unflatten_dt_node(0, &start, NULL, NULL, 0); |
| 1038 | size = (size | 3) + 1; |
| 1039 | |
| 1040 | DBG(" size is %lx, allocating...\n", size); |
| 1041 | |
| 1042 | /* Allocate memory for the expanded device tree */ |
| 1043 | mem = lmb_alloc(size + 4, __alignof__(struct device_node)); |
| 1044 | if (!mem) { |
| 1045 | DBG("Couldn't allocate memory with lmb_alloc()!\n"); |
| 1046 | panic("Couldn't allocate memory with lmb_alloc()!\n"); |
| 1047 | } |
| 1048 | mem = (unsigned long) __va(mem); |
| 1049 | |
| 1050 | ((u32 *)mem)[size / 4] = 0xdeadbeef; |
| 1051 | |
| 1052 | DBG(" unflattening %lx...\n", mem); |
| 1053 | |
| 1054 | /* Second pass, do actual unflattening */ |
| 1055 | start = ((unsigned long)initial_boot_params) + |
| 1056 | initial_boot_params->off_dt_struct; |
| 1057 | unflatten_dt_node(mem, &start, NULL, &allnextp, 0); |
| 1058 | if (*((u32 *)start) != OF_DT_END) |
| 1059 | printk(KERN_WARNING "Weird tag at end of tree: %08x\n", *((u32 *)start)); |
| 1060 | if (((u32 *)mem)[size / 4] != 0xdeadbeef) |
| 1061 | printk(KERN_WARNING "End of tree marker overwritten: %08x\n", |
| 1062 | ((u32 *)mem)[size / 4] ); |
| 1063 | *allnextp = NULL; |
| 1064 | |
| 1065 | /* Get pointer to OF "/chosen" node for use everywhere */ |
| 1066 | of_chosen = of_find_node_by_path("/chosen"); |
| 1067 | if (of_chosen == NULL) |
| 1068 | of_chosen = of_find_node_by_path("/chosen@0"); |
| 1069 | |
| 1070 | /* Retreive command line */ |
| 1071 | if (of_chosen != NULL) { |
| 1072 | p = (char *)get_property(of_chosen, "bootargs", &l); |
| 1073 | if (p != NULL && l > 0) |
| 1074 | strlcpy(cmd_line, p, min(l, COMMAND_LINE_SIZE)); |
| 1075 | } |
| 1076 | #ifdef CONFIG_CMDLINE |
| 1077 | if (l == 0 || (l == 1 && (*p) == 0)) |
| 1078 | strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE); |
| 1079 | #endif /* CONFIG_CMDLINE */ |
| 1080 | |
| 1081 | DBG("Command line is: %s\n", cmd_line); |
| 1082 | |
| 1083 | DBG(" <- unflatten_device_tree()\n"); |
| 1084 | } |
| 1085 | |
| 1086 | |
| 1087 | static int __init early_init_dt_scan_cpus(unsigned long node, |
| 1088 | const char *uname, int depth, void *data) |
| 1089 | { |
| 1090 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
| 1091 | u32 *prop; |
| 1092 | unsigned long size = 0; |
| 1093 | |
| 1094 | /* We are scanning "cpu" nodes only */ |
| 1095 | if (type == NULL || strcmp(type, "cpu") != 0) |
| 1096 | return 0; |
| 1097 | |
| 1098 | boot_cpuid = 0; |
| 1099 | boot_cpuid_phys = 0; |
| 1100 | if (initial_boot_params && initial_boot_params->version >= 2) { |
| 1101 | /* version 2 of the kexec param format adds the phys cpuid |
| 1102 | * of booted proc. |
| 1103 | */ |
| 1104 | boot_cpuid_phys = initial_boot_params->boot_cpuid_phys; |
| 1105 | } else { |
| 1106 | /* Check if it's the boot-cpu, set it's hw index now */ |
| 1107 | if (of_get_flat_dt_prop(node, |
| 1108 | "linux,boot-cpu", NULL) != NULL) { |
| 1109 | prop = of_get_flat_dt_prop(node, "reg", NULL); |
| 1110 | if (prop != NULL) |
| 1111 | boot_cpuid_phys = *prop; |
| 1112 | } |
| 1113 | } |
| 1114 | set_hard_smp_processor_id(0, boot_cpuid_phys); |
| 1115 | |
| 1116 | #ifdef CONFIG_ALTIVEC |
| 1117 | /* Check if we have a VMX and eventually update CPU features */ |
| 1118 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,vmx", &size); |
| 1119 | if (prop && (*prop) > 0) { |
| 1120 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; |
| 1121 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; |
| 1122 | } |
| 1123 | |
| 1124 | /* Same goes for Apple's "altivec" property */ |
| 1125 | prop = (u32 *)of_get_flat_dt_prop(node, "altivec", NULL); |
| 1126 | if (prop) { |
| 1127 | cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC; |
| 1128 | cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC; |
| 1129 | } |
| 1130 | #endif /* CONFIG_ALTIVEC */ |
| 1131 | |
| 1132 | #ifdef CONFIG_PPC_PSERIES |
| 1133 | /* |
| 1134 | * Check for an SMT capable CPU and set the CPU feature. We do |
| 1135 | * this by looking at the size of the ibm,ppc-interrupt-server#s |
| 1136 | * property |
| 1137 | */ |
| 1138 | prop = (u32 *)of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", |
| 1139 | &size); |
| 1140 | cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT; |
| 1141 | if (prop && ((size / sizeof(u32)) > 1)) |
| 1142 | cur_cpu_spec->cpu_features |= CPU_FTR_SMT; |
| 1143 | #endif |
| 1144 | |
| 1145 | return 0; |
| 1146 | } |
| 1147 | |
| 1148 | static int __init early_init_dt_scan_chosen(unsigned long node, |
| 1149 | const char *uname, int depth, void *data) |
| 1150 | { |
| 1151 | u32 *prop; |
| 1152 | unsigned long *lprop; |
| 1153 | |
| 1154 | DBG("search \"chosen\", depth: %d, uname: %s\n", depth, uname); |
| 1155 | |
| 1156 | if (depth != 1 || |
| 1157 | (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
| 1158 | return 0; |
| 1159 | |
| 1160 | /* get platform type */ |
| 1161 | prop = (u32 *)of_get_flat_dt_prop(node, "linux,platform", NULL); |
| 1162 | if (prop == NULL) |
| 1163 | return 0; |
| 1164 | #ifdef CONFIG_PPC64 |
| 1165 | systemcfg->platform = *prop; |
| 1166 | #else |
| 1167 | #ifdef CONFIG_PPC_MULTIPLATFORM |
| 1168 | _machine = *prop; |
| 1169 | #endif |
| 1170 | #endif |
| 1171 | |
| 1172 | #ifdef CONFIG_PPC64 |
| 1173 | /* check if iommu is forced on or off */ |
| 1174 | if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL) |
| 1175 | iommu_is_off = 1; |
| 1176 | if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL) |
| 1177 | iommu_force_on = 1; |
| 1178 | #endif |
| 1179 | |
| 1180 | lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL); |
| 1181 | if (lprop) |
| 1182 | memory_limit = *lprop; |
| 1183 | |
| 1184 | #ifdef CONFIG_PPC64 |
| 1185 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL); |
| 1186 | if (lprop) |
| 1187 | tce_alloc_start = *lprop; |
| 1188 | lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL); |
| 1189 | if (lprop) |
| 1190 | tce_alloc_end = *lprop; |
| 1191 | #endif |
| 1192 | |
| 1193 | #ifdef CONFIG_PPC_RTAS |
| 1194 | /* To help early debugging via the front panel, we retreive a minimal |
| 1195 | * set of RTAS infos now if available |
| 1196 | */ |
| 1197 | { |
| 1198 | u64 *basep, *entryp; |
| 1199 | |
| 1200 | basep = of_get_flat_dt_prop(node, "linux,rtas-base", NULL); |
| 1201 | entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL); |
| 1202 | prop = of_get_flat_dt_prop(node, "linux,rtas-size", NULL); |
| 1203 | if (basep && entryp && prop) { |
| 1204 | rtas.base = *basep; |
| 1205 | rtas.entry = *entryp; |
| 1206 | rtas.size = *prop; |
| 1207 | } |
| 1208 | } |
| 1209 | #endif /* CONFIG_PPC_RTAS */ |
| 1210 | |
| 1211 | /* break now */ |
| 1212 | return 1; |
| 1213 | } |
| 1214 | |
| 1215 | static int __init early_init_dt_scan_root(unsigned long node, |
| 1216 | const char *uname, int depth, void *data) |
| 1217 | { |
| 1218 | u32 *prop; |
| 1219 | |
| 1220 | if (depth != 0) |
| 1221 | return 0; |
| 1222 | |
| 1223 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
| 1224 | dt_root_size_cells = (prop == NULL) ? 1 : *prop; |
| 1225 | DBG("dt_root_size_cells = %x\n", dt_root_size_cells); |
| 1226 | |
| 1227 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); |
| 1228 | dt_root_addr_cells = (prop == NULL) ? 2 : *prop; |
| 1229 | DBG("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
| 1230 | |
| 1231 | /* break now */ |
| 1232 | return 1; |
| 1233 | } |
| 1234 | |
| 1235 | static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp) |
| 1236 | { |
| 1237 | cell_t *p = *cellp; |
| 1238 | unsigned long r; |
| 1239 | |
| 1240 | /* Ignore more than 2 cells */ |
| 1241 | while (s > sizeof(unsigned long) / 4) { |
| 1242 | p++; |
| 1243 | s--; |
| 1244 | } |
| 1245 | r = *p++; |
| 1246 | #ifdef CONFIG_PPC64 |
| 1247 | if (s > 1) { |
| 1248 | r <<= 32; |
| 1249 | r |= *(p++); |
| 1250 | s--; |
| 1251 | } |
| 1252 | #endif |
| 1253 | |
| 1254 | *cellp = p; |
| 1255 | return r; |
| 1256 | } |
| 1257 | |
| 1258 | |
| 1259 | static int __init early_init_dt_scan_memory(unsigned long node, |
| 1260 | const char *uname, int depth, void *data) |
| 1261 | { |
| 1262 | char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
| 1263 | cell_t *reg, *endp; |
| 1264 | unsigned long l; |
| 1265 | |
| 1266 | /* We are scanning "memory" nodes only */ |
| 1267 | if (type == NULL || strcmp(type, "memory") != 0) |
| 1268 | return 0; |
| 1269 | |
| 1270 | reg = (cell_t *)of_get_flat_dt_prop(node, "reg", &l); |
| 1271 | if (reg == NULL) |
| 1272 | return 0; |
| 1273 | |
| 1274 | endp = reg + (l / sizeof(cell_t)); |
| 1275 | |
| 1276 | DBG("memory scan node %s, reg size %ld, data: %x %x %x %x,\n", |
| 1277 | uname, l, reg[0], reg[1], reg[2], reg[3]); |
| 1278 | |
| 1279 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { |
| 1280 | unsigned long base, size; |
| 1281 | |
| 1282 | base = dt_mem_next_cell(dt_root_addr_cells, ®); |
| 1283 | size = dt_mem_next_cell(dt_root_size_cells, ®); |
| 1284 | |
| 1285 | if (size == 0) |
| 1286 | continue; |
| 1287 | DBG(" - %lx , %lx\n", base, size); |
| 1288 | #ifdef CONFIG_PPC64 |
| 1289 | if (iommu_is_off) { |
| 1290 | if (base >= 0x80000000ul) |
| 1291 | continue; |
| 1292 | if ((base + size) > 0x80000000ul) |
| 1293 | size = 0x80000000ul - base; |
| 1294 | } |
| 1295 | #endif |
| 1296 | lmb_add(base, size); |
| 1297 | } |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | static void __init early_reserve_mem(void) |
| 1302 | { |
| 1303 | unsigned long base, size; |
| 1304 | unsigned long *reserve_map; |
| 1305 | |
| 1306 | reserve_map = (unsigned long *)(((unsigned long)initial_boot_params) + |
| 1307 | initial_boot_params->off_mem_rsvmap); |
| 1308 | while (1) { |
| 1309 | base = *(reserve_map++); |
| 1310 | size = *(reserve_map++); |
| 1311 | if (size == 0) |
| 1312 | break; |
| 1313 | DBG("reserving: %lx -> %lx\n", base, size); |
| 1314 | lmb_reserve(base, size); |
| 1315 | } |
| 1316 | |
| 1317 | #if 0 |
| 1318 | DBG("memory reserved, lmbs :\n"); |
| 1319 | lmb_dump_all(); |
| 1320 | #endif |
| 1321 | } |
| 1322 | |
| 1323 | void __init early_init_devtree(void *params) |
| 1324 | { |
| 1325 | DBG(" -> early_init_devtree()\n"); |
| 1326 | |
| 1327 | /* Setup flat device-tree pointer */ |
| 1328 | initial_boot_params = params; |
| 1329 | |
| 1330 | /* Retrieve various informations from the /chosen node of the |
| 1331 | * device-tree, including the platform type, initrd location and |
| 1332 | * size, TCE reserve, and more ... |
| 1333 | */ |
| 1334 | of_scan_flat_dt(early_init_dt_scan_chosen, NULL); |
| 1335 | |
| 1336 | /* Scan memory nodes and rebuild LMBs */ |
| 1337 | lmb_init(); |
| 1338 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
| 1339 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); |
| 1340 | lmb_enforce_memory_limit(memory_limit); |
| 1341 | lmb_analyze(); |
| 1342 | #ifdef CONFIG_PPC64 |
| 1343 | systemcfg->physicalMemorySize = lmb_phys_mem_size(); |
| 1344 | #endif |
| 1345 | lmb_reserve(0, __pa(klimit)); |
| 1346 | |
| 1347 | DBG("Phys. mem: %lx\n", lmb_phys_mem_size()); |
| 1348 | |
| 1349 | /* Reserve LMB regions used by kernel, initrd, dt, etc... */ |
| 1350 | early_reserve_mem(); |
| 1351 | |
| 1352 | DBG("Scanning CPUs ...\n"); |
| 1353 | |
| 1354 | /* Retreive CPU related informations from the flat tree |
| 1355 | * (altivec support, boot CPU ID, ...) |
| 1356 | */ |
| 1357 | of_scan_flat_dt(early_init_dt_scan_cpus, NULL); |
| 1358 | |
| 1359 | DBG(" <- early_init_devtree()\n"); |
| 1360 | } |
| 1361 | |
| 1362 | #undef printk |
| 1363 | |
| 1364 | int |
| 1365 | prom_n_addr_cells(struct device_node* np) |
| 1366 | { |
| 1367 | int* ip; |
| 1368 | do { |
| 1369 | if (np->parent) |
| 1370 | np = np->parent; |
| 1371 | ip = (int *) get_property(np, "#address-cells", NULL); |
| 1372 | if (ip != NULL) |
| 1373 | return *ip; |
| 1374 | } while (np->parent); |
| 1375 | /* No #address-cells property for the root node, default to 1 */ |
| 1376 | return 1; |
| 1377 | } |
| 1378 | |
| 1379 | int |
| 1380 | prom_n_size_cells(struct device_node* np) |
| 1381 | { |
| 1382 | int* ip; |
| 1383 | do { |
| 1384 | if (np->parent) |
| 1385 | np = np->parent; |
| 1386 | ip = (int *) get_property(np, "#size-cells", NULL); |
| 1387 | if (ip != NULL) |
| 1388 | return *ip; |
| 1389 | } while (np->parent); |
| 1390 | /* No #size-cells property for the root node, default to 1 */ |
| 1391 | return 1; |
| 1392 | } |
| 1393 | |
| 1394 | /** |
| 1395 | * Work out the sense (active-low level / active-high edge) |
| 1396 | * of each interrupt from the device tree. |
| 1397 | */ |
| 1398 | void __init prom_get_irq_senses(unsigned char *senses, int off, int max) |
| 1399 | { |
| 1400 | struct device_node *np; |
| 1401 | int i, j; |
| 1402 | |
| 1403 | /* default to level-triggered */ |
| 1404 | memset(senses, IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, max - off); |
| 1405 | |
| 1406 | for (np = allnodes; np != 0; np = np->allnext) { |
| 1407 | for (j = 0; j < np->n_intrs; j++) { |
| 1408 | i = np->intrs[j].line; |
| 1409 | if (i >= off && i < max) |
| 1410 | senses[i-off] = np->intrs[j].sense; |
| 1411 | } |
| 1412 | } |
| 1413 | } |
| 1414 | |
| 1415 | /** |
| 1416 | * Construct and return a list of the device_nodes with a given name. |
| 1417 | */ |
| 1418 | struct device_node *find_devices(const char *name) |
| 1419 | { |
| 1420 | struct device_node *head, **prevp, *np; |
| 1421 | |
| 1422 | prevp = &head; |
| 1423 | for (np = allnodes; np != 0; np = np->allnext) { |
| 1424 | if (np->name != 0 && strcasecmp(np->name, name) == 0) { |
| 1425 | *prevp = np; |
| 1426 | prevp = &np->next; |
| 1427 | } |
| 1428 | } |
| 1429 | *prevp = NULL; |
| 1430 | return head; |
| 1431 | } |
| 1432 | EXPORT_SYMBOL(find_devices); |
| 1433 | |
| 1434 | /** |
| 1435 | * Construct and return a list of the device_nodes with a given type. |
| 1436 | */ |
| 1437 | struct device_node *find_type_devices(const char *type) |
| 1438 | { |
| 1439 | struct device_node *head, **prevp, *np; |
| 1440 | |
| 1441 | prevp = &head; |
| 1442 | for (np = allnodes; np != 0; np = np->allnext) { |
| 1443 | if (np->type != 0 && strcasecmp(np->type, type) == 0) { |
| 1444 | *prevp = np; |
| 1445 | prevp = &np->next; |
| 1446 | } |
| 1447 | } |
| 1448 | *prevp = NULL; |
| 1449 | return head; |
| 1450 | } |
| 1451 | EXPORT_SYMBOL(find_type_devices); |
| 1452 | |
| 1453 | /** |
| 1454 | * Returns all nodes linked together |
| 1455 | */ |
| 1456 | struct device_node *find_all_nodes(void) |
| 1457 | { |
| 1458 | struct device_node *head, **prevp, *np; |
| 1459 | |
| 1460 | prevp = &head; |
| 1461 | for (np = allnodes; np != 0; np = np->allnext) { |
| 1462 | *prevp = np; |
| 1463 | prevp = &np->next; |
| 1464 | } |
| 1465 | *prevp = NULL; |
| 1466 | return head; |
| 1467 | } |
| 1468 | EXPORT_SYMBOL(find_all_nodes); |
| 1469 | |
| 1470 | /** Checks if the given "compat" string matches one of the strings in |
| 1471 | * the device's "compatible" property |
| 1472 | */ |
| 1473 | int device_is_compatible(struct device_node *device, const char *compat) |
| 1474 | { |
| 1475 | const char* cp; |
| 1476 | int cplen, l; |
| 1477 | |
| 1478 | cp = (char *) get_property(device, "compatible", &cplen); |
| 1479 | if (cp == NULL) |
| 1480 | return 0; |
| 1481 | while (cplen > 0) { |
| 1482 | if (strncasecmp(cp, compat, strlen(compat)) == 0) |
| 1483 | return 1; |
| 1484 | l = strlen(cp) + 1; |
| 1485 | cp += l; |
| 1486 | cplen -= l; |
| 1487 | } |
| 1488 | |
| 1489 | return 0; |
| 1490 | } |
| 1491 | EXPORT_SYMBOL(device_is_compatible); |
| 1492 | |
| 1493 | |
| 1494 | /** |
| 1495 | * Indicates whether the root node has a given value in its |
| 1496 | * compatible property. |
| 1497 | */ |
| 1498 | int machine_is_compatible(const char *compat) |
| 1499 | { |
| 1500 | struct device_node *root; |
| 1501 | int rc = 0; |
| 1502 | |
| 1503 | root = of_find_node_by_path("/"); |
| 1504 | if (root) { |
| 1505 | rc = device_is_compatible(root, compat); |
| 1506 | of_node_put(root); |
| 1507 | } |
| 1508 | return rc; |
| 1509 | } |
| 1510 | EXPORT_SYMBOL(machine_is_compatible); |
| 1511 | |
| 1512 | /** |
| 1513 | * Construct and return a list of the device_nodes with a given type |
| 1514 | * and compatible property. |
| 1515 | */ |
| 1516 | struct device_node *find_compatible_devices(const char *type, |
| 1517 | const char *compat) |
| 1518 | { |
| 1519 | struct device_node *head, **prevp, *np; |
| 1520 | |
| 1521 | prevp = &head; |
| 1522 | for (np = allnodes; np != 0; np = np->allnext) { |
| 1523 | if (type != NULL |
| 1524 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) |
| 1525 | continue; |
| 1526 | if (device_is_compatible(np, compat)) { |
| 1527 | *prevp = np; |
| 1528 | prevp = &np->next; |
| 1529 | } |
| 1530 | } |
| 1531 | *prevp = NULL; |
| 1532 | return head; |
| 1533 | } |
| 1534 | EXPORT_SYMBOL(find_compatible_devices); |
| 1535 | |
| 1536 | /** |
| 1537 | * Find the device_node with a given full_name. |
| 1538 | */ |
| 1539 | struct device_node *find_path_device(const char *path) |
| 1540 | { |
| 1541 | struct device_node *np; |
| 1542 | |
| 1543 | for (np = allnodes; np != 0; np = np->allnext) |
| 1544 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0) |
| 1545 | return np; |
| 1546 | return NULL; |
| 1547 | } |
| 1548 | EXPORT_SYMBOL(find_path_device); |
| 1549 | |
| 1550 | /******* |
| 1551 | * |
| 1552 | * New implementation of the OF "find" APIs, return a refcounted |
| 1553 | * object, call of_node_put() when done. The device tree and list |
| 1554 | * are protected by a rw_lock. |
| 1555 | * |
| 1556 | * Note that property management will need some locking as well, |
| 1557 | * this isn't dealt with yet. |
| 1558 | * |
| 1559 | *******/ |
| 1560 | |
| 1561 | /** |
| 1562 | * of_find_node_by_name - Find a node by its "name" property |
| 1563 | * @from: The node to start searching from or NULL, the node |
| 1564 | * you pass will not be searched, only the next one |
| 1565 | * will; typically, you pass what the previous call |
| 1566 | * returned. of_node_put() will be called on it |
| 1567 | * @name: The name string to match against |
| 1568 | * |
| 1569 | * Returns a node pointer with refcount incremented, use |
| 1570 | * of_node_put() on it when done. |
| 1571 | */ |
| 1572 | struct device_node *of_find_node_by_name(struct device_node *from, |
| 1573 | const char *name) |
| 1574 | { |
| 1575 | struct device_node *np; |
| 1576 | |
| 1577 | read_lock(&devtree_lock); |
| 1578 | np = from ? from->allnext : allnodes; |
| 1579 | for (; np != 0; np = np->allnext) |
| 1580 | if (np->name != 0 && strcasecmp(np->name, name) == 0 |
| 1581 | && of_node_get(np)) |
| 1582 | break; |
| 1583 | if (from) |
| 1584 | of_node_put(from); |
| 1585 | read_unlock(&devtree_lock); |
| 1586 | return np; |
| 1587 | } |
| 1588 | EXPORT_SYMBOL(of_find_node_by_name); |
| 1589 | |
| 1590 | /** |
| 1591 | * of_find_node_by_type - Find a node by its "device_type" property |
| 1592 | * @from: The node to start searching from or NULL, the node |
| 1593 | * you pass will not be searched, only the next one |
| 1594 | * will; typically, you pass what the previous call |
| 1595 | * returned. of_node_put() will be called on it |
| 1596 | * @name: The type string to match against |
| 1597 | * |
| 1598 | * Returns a node pointer with refcount incremented, use |
| 1599 | * of_node_put() on it when done. |
| 1600 | */ |
| 1601 | struct device_node *of_find_node_by_type(struct device_node *from, |
| 1602 | const char *type) |
| 1603 | { |
| 1604 | struct device_node *np; |
| 1605 | |
| 1606 | read_lock(&devtree_lock); |
| 1607 | np = from ? from->allnext : allnodes; |
| 1608 | for (; np != 0; np = np->allnext) |
| 1609 | if (np->type != 0 && strcasecmp(np->type, type) == 0 |
| 1610 | && of_node_get(np)) |
| 1611 | break; |
| 1612 | if (from) |
| 1613 | of_node_put(from); |
| 1614 | read_unlock(&devtree_lock); |
| 1615 | return np; |
| 1616 | } |
| 1617 | EXPORT_SYMBOL(of_find_node_by_type); |
| 1618 | |
| 1619 | /** |
| 1620 | * of_find_compatible_node - Find a node based on type and one of the |
| 1621 | * tokens in its "compatible" property |
| 1622 | * @from: The node to start searching from or NULL, the node |
| 1623 | * you pass will not be searched, only the next one |
| 1624 | * will; typically, you pass what the previous call |
| 1625 | * returned. of_node_put() will be called on it |
| 1626 | * @type: The type string to match "device_type" or NULL to ignore |
| 1627 | * @compatible: The string to match to one of the tokens in the device |
| 1628 | * "compatible" list. |
| 1629 | * |
| 1630 | * Returns a node pointer with refcount incremented, use |
| 1631 | * of_node_put() on it when done. |
| 1632 | */ |
| 1633 | struct device_node *of_find_compatible_node(struct device_node *from, |
| 1634 | const char *type, const char *compatible) |
| 1635 | { |
| 1636 | struct device_node *np; |
| 1637 | |
| 1638 | read_lock(&devtree_lock); |
| 1639 | np = from ? from->allnext : allnodes; |
| 1640 | for (; np != 0; np = np->allnext) { |
| 1641 | if (type != NULL |
| 1642 | && !(np->type != 0 && strcasecmp(np->type, type) == 0)) |
| 1643 | continue; |
| 1644 | if (device_is_compatible(np, compatible) && of_node_get(np)) |
| 1645 | break; |
| 1646 | } |
| 1647 | if (from) |
| 1648 | of_node_put(from); |
| 1649 | read_unlock(&devtree_lock); |
| 1650 | return np; |
| 1651 | } |
| 1652 | EXPORT_SYMBOL(of_find_compatible_node); |
| 1653 | |
| 1654 | /** |
| 1655 | * of_find_node_by_path - Find a node matching a full OF path |
| 1656 | * @path: The full path to match |
| 1657 | * |
| 1658 | * Returns a node pointer with refcount incremented, use |
| 1659 | * of_node_put() on it when done. |
| 1660 | */ |
| 1661 | struct device_node *of_find_node_by_path(const char *path) |
| 1662 | { |
| 1663 | struct device_node *np = allnodes; |
| 1664 | |
| 1665 | read_lock(&devtree_lock); |
| 1666 | for (; np != 0; np = np->allnext) { |
| 1667 | if (np->full_name != 0 && strcasecmp(np->full_name, path) == 0 |
| 1668 | && of_node_get(np)) |
| 1669 | break; |
| 1670 | } |
| 1671 | read_unlock(&devtree_lock); |
| 1672 | return np; |
| 1673 | } |
| 1674 | EXPORT_SYMBOL(of_find_node_by_path); |
| 1675 | |
| 1676 | /** |
| 1677 | * of_find_node_by_phandle - Find a node given a phandle |
| 1678 | * @handle: phandle of the node to find |
| 1679 | * |
| 1680 | * Returns a node pointer with refcount incremented, use |
| 1681 | * of_node_put() on it when done. |
| 1682 | */ |
| 1683 | struct device_node *of_find_node_by_phandle(phandle handle) |
| 1684 | { |
| 1685 | struct device_node *np; |
| 1686 | |
| 1687 | read_lock(&devtree_lock); |
| 1688 | for (np = allnodes; np != 0; np = np->allnext) |
| 1689 | if (np->linux_phandle == handle) |
| 1690 | break; |
| 1691 | if (np) |
| 1692 | of_node_get(np); |
| 1693 | read_unlock(&devtree_lock); |
| 1694 | return np; |
| 1695 | } |
| 1696 | EXPORT_SYMBOL(of_find_node_by_phandle); |
| 1697 | |
| 1698 | /** |
| 1699 | * of_find_all_nodes - Get next node in global list |
| 1700 | * @prev: Previous node or NULL to start iteration |
| 1701 | * of_node_put() will be called on it |
| 1702 | * |
| 1703 | * Returns a node pointer with refcount incremented, use |
| 1704 | * of_node_put() on it when done. |
| 1705 | */ |
| 1706 | struct device_node *of_find_all_nodes(struct device_node *prev) |
| 1707 | { |
| 1708 | struct device_node *np; |
| 1709 | |
| 1710 | read_lock(&devtree_lock); |
| 1711 | np = prev ? prev->allnext : allnodes; |
| 1712 | for (; np != 0; np = np->allnext) |
| 1713 | if (of_node_get(np)) |
| 1714 | break; |
| 1715 | if (prev) |
| 1716 | of_node_put(prev); |
| 1717 | read_unlock(&devtree_lock); |
| 1718 | return np; |
| 1719 | } |
| 1720 | EXPORT_SYMBOL(of_find_all_nodes); |
| 1721 | |
| 1722 | /** |
| 1723 | * of_get_parent - Get a node's parent if any |
| 1724 | * @node: Node to get parent |
| 1725 | * |
| 1726 | * Returns a node pointer with refcount incremented, use |
| 1727 | * of_node_put() on it when done. |
| 1728 | */ |
| 1729 | struct device_node *of_get_parent(const struct device_node *node) |
| 1730 | { |
| 1731 | struct device_node *np; |
| 1732 | |
| 1733 | if (!node) |
| 1734 | return NULL; |
| 1735 | |
| 1736 | read_lock(&devtree_lock); |
| 1737 | np = of_node_get(node->parent); |
| 1738 | read_unlock(&devtree_lock); |
| 1739 | return np; |
| 1740 | } |
| 1741 | EXPORT_SYMBOL(of_get_parent); |
| 1742 | |
| 1743 | /** |
| 1744 | * of_get_next_child - Iterate a node childs |
| 1745 | * @node: parent node |
| 1746 | * @prev: previous child of the parent node, or NULL to get first |
| 1747 | * |
| 1748 | * Returns a node pointer with refcount incremented, use |
| 1749 | * of_node_put() on it when done. |
| 1750 | */ |
| 1751 | struct device_node *of_get_next_child(const struct device_node *node, |
| 1752 | struct device_node *prev) |
| 1753 | { |
| 1754 | struct device_node *next; |
| 1755 | |
| 1756 | read_lock(&devtree_lock); |
| 1757 | next = prev ? prev->sibling : node->child; |
| 1758 | for (; next != 0; next = next->sibling) |
| 1759 | if (of_node_get(next)) |
| 1760 | break; |
| 1761 | if (prev) |
| 1762 | of_node_put(prev); |
| 1763 | read_unlock(&devtree_lock); |
| 1764 | return next; |
| 1765 | } |
| 1766 | EXPORT_SYMBOL(of_get_next_child); |
| 1767 | |
| 1768 | /** |
| 1769 | * of_node_get - Increment refcount of a node |
| 1770 | * @node: Node to inc refcount, NULL is supported to |
| 1771 | * simplify writing of callers |
| 1772 | * |
| 1773 | * Returns node. |
| 1774 | */ |
| 1775 | struct device_node *of_node_get(struct device_node *node) |
| 1776 | { |
| 1777 | if (node) |
| 1778 | kref_get(&node->kref); |
| 1779 | return node; |
| 1780 | } |
| 1781 | EXPORT_SYMBOL(of_node_get); |
| 1782 | |
| 1783 | static inline struct device_node * kref_to_device_node(struct kref *kref) |
| 1784 | { |
| 1785 | return container_of(kref, struct device_node, kref); |
| 1786 | } |
| 1787 | |
| 1788 | /** |
| 1789 | * of_node_release - release a dynamically allocated node |
| 1790 | * @kref: kref element of the node to be released |
| 1791 | * |
| 1792 | * In of_node_put() this function is passed to kref_put() |
| 1793 | * as the destructor. |
| 1794 | */ |
| 1795 | static void of_node_release(struct kref *kref) |
| 1796 | { |
| 1797 | struct device_node *node = kref_to_device_node(kref); |
| 1798 | struct property *prop = node->properties; |
| 1799 | |
| 1800 | if (!OF_IS_DYNAMIC(node)) |
| 1801 | return; |
| 1802 | while (prop) { |
| 1803 | struct property *next = prop->next; |
| 1804 | kfree(prop->name); |
| 1805 | kfree(prop->value); |
| 1806 | kfree(prop); |
| 1807 | prop = next; |
| 1808 | } |
| 1809 | kfree(node->intrs); |
| 1810 | kfree(node->addrs); |
| 1811 | kfree(node->full_name); |
| 1812 | kfree(node->data); |
| 1813 | kfree(node); |
| 1814 | } |
| 1815 | |
| 1816 | /** |
| 1817 | * of_node_put - Decrement refcount of a node |
| 1818 | * @node: Node to dec refcount, NULL is supported to |
| 1819 | * simplify writing of callers |
| 1820 | * |
| 1821 | */ |
| 1822 | void of_node_put(struct device_node *node) |
| 1823 | { |
| 1824 | if (node) |
| 1825 | kref_put(&node->kref, of_node_release); |
| 1826 | } |
| 1827 | EXPORT_SYMBOL(of_node_put); |
| 1828 | |
| 1829 | /* |
| 1830 | * Plug a device node into the tree and global list. |
| 1831 | */ |
| 1832 | void of_attach_node(struct device_node *np) |
| 1833 | { |
| 1834 | write_lock(&devtree_lock); |
| 1835 | np->sibling = np->parent->child; |
| 1836 | np->allnext = allnodes; |
| 1837 | np->parent->child = np; |
| 1838 | allnodes = np; |
| 1839 | write_unlock(&devtree_lock); |
| 1840 | } |
| 1841 | |
| 1842 | /* |
| 1843 | * "Unplug" a node from the device tree. The caller must hold |
| 1844 | * a reference to the node. The memory associated with the node |
| 1845 | * is not freed until its refcount goes to zero. |
| 1846 | */ |
| 1847 | void of_detach_node(const struct device_node *np) |
| 1848 | { |
| 1849 | struct device_node *parent; |
| 1850 | |
| 1851 | write_lock(&devtree_lock); |
| 1852 | |
| 1853 | parent = np->parent; |
| 1854 | |
| 1855 | if (allnodes == np) |
| 1856 | allnodes = np->allnext; |
| 1857 | else { |
| 1858 | struct device_node *prev; |
| 1859 | for (prev = allnodes; |
| 1860 | prev->allnext != np; |
| 1861 | prev = prev->allnext) |
| 1862 | ; |
| 1863 | prev->allnext = np->allnext; |
| 1864 | } |
| 1865 | |
| 1866 | if (parent->child == np) |
| 1867 | parent->child = np->sibling; |
| 1868 | else { |
| 1869 | struct device_node *prevsib; |
| 1870 | for (prevsib = np->parent->child; |
| 1871 | prevsib->sibling != np; |
| 1872 | prevsib = prevsib->sibling) |
| 1873 | ; |
| 1874 | prevsib->sibling = np->sibling; |
| 1875 | } |
| 1876 | |
| 1877 | write_unlock(&devtree_lock); |
| 1878 | } |
| 1879 | |
| 1880 | #ifdef CONFIG_PPC_PSERIES |
| 1881 | /* |
| 1882 | * Fix up the uninitialized fields in a new device node: |
| 1883 | * name, type, n_addrs, addrs, n_intrs, intrs, and pci-specific fields |
| 1884 | * |
| 1885 | * A lot of boot-time code is duplicated here, because functions such |
| 1886 | * as finish_node_interrupts, interpret_pci_props, etc. cannot use the |
| 1887 | * slab allocator. |
| 1888 | * |
| 1889 | * This should probably be split up into smaller chunks. |
| 1890 | */ |
| 1891 | |
| 1892 | static int of_finish_dynamic_node(struct device_node *node, |
| 1893 | unsigned long *unused1, int unused2, |
| 1894 | int unused3, int unused4) |
| 1895 | { |
| 1896 | struct device_node *parent = of_get_parent(node); |
| 1897 | int err = 0; |
| 1898 | phandle *ibm_phandle; |
| 1899 | |
| 1900 | node->name = get_property(node, "name", NULL); |
| 1901 | node->type = get_property(node, "device_type", NULL); |
| 1902 | |
| 1903 | if (!parent) { |
| 1904 | err = -ENODEV; |
| 1905 | goto out; |
| 1906 | } |
| 1907 | |
| 1908 | /* We don't support that function on PowerMac, at least |
| 1909 | * not yet |
| 1910 | */ |
| 1911 | if (systemcfg->platform == PLATFORM_POWERMAC) |
| 1912 | return -ENODEV; |
| 1913 | |
| 1914 | /* fix up new node's linux_phandle field */ |
| 1915 | if ((ibm_phandle = (unsigned int *)get_property(node, "ibm,phandle", NULL))) |
| 1916 | node->linux_phandle = *ibm_phandle; |
| 1917 | |
| 1918 | out: |
| 1919 | of_node_put(parent); |
| 1920 | return err; |
| 1921 | } |
| 1922 | |
| 1923 | static int prom_reconfig_notifier(struct notifier_block *nb, |
| 1924 | unsigned long action, void *node) |
| 1925 | { |
| 1926 | int err; |
| 1927 | |
| 1928 | switch (action) { |
| 1929 | case PSERIES_RECONFIG_ADD: |
| 1930 | err = finish_node(node, NULL, of_finish_dynamic_node, 0, 0, 0); |
| 1931 | if (err < 0) { |
| 1932 | printk(KERN_ERR "finish_node returned %d\n", err); |
| 1933 | err = NOTIFY_BAD; |
| 1934 | } |
| 1935 | break; |
| 1936 | default: |
| 1937 | err = NOTIFY_DONE; |
| 1938 | break; |
| 1939 | } |
| 1940 | return err; |
| 1941 | } |
| 1942 | |
| 1943 | static struct notifier_block prom_reconfig_nb = { |
| 1944 | .notifier_call = prom_reconfig_notifier, |
| 1945 | .priority = 10, /* This one needs to run first */ |
| 1946 | }; |
| 1947 | |
| 1948 | static int __init prom_reconfig_setup(void) |
| 1949 | { |
| 1950 | return pSeries_reconfig_notifier_register(&prom_reconfig_nb); |
| 1951 | } |
| 1952 | __initcall(prom_reconfig_setup); |
| 1953 | #endif |
| 1954 | |
| 1955 | /* |
| 1956 | * Find a property with a given name for a given node |
| 1957 | * and return the value. |
| 1958 | */ |
| 1959 | unsigned char *get_property(struct device_node *np, const char *name, |
| 1960 | int *lenp) |
| 1961 | { |
| 1962 | struct property *pp; |
| 1963 | |
| 1964 | for (pp = np->properties; pp != 0; pp = pp->next) |
| 1965 | if (strcmp(pp->name, name) == 0) { |
| 1966 | if (lenp != 0) |
| 1967 | *lenp = pp->length; |
| 1968 | return pp->value; |
| 1969 | } |
| 1970 | return NULL; |
| 1971 | } |
| 1972 | EXPORT_SYMBOL(get_property); |
| 1973 | |
| 1974 | /* |
| 1975 | * Add a property to a node |
| 1976 | */ |
| 1977 | int prom_add_property(struct device_node* np, struct property* prop) |
| 1978 | { |
| 1979 | struct property **next; |
| 1980 | |
| 1981 | prop->next = NULL; |
| 1982 | write_lock(&devtree_lock); |
| 1983 | next = &np->properties; |
| 1984 | while (*next) { |
| 1985 | if (strcmp(prop->name, (*next)->name) == 0) { |
| 1986 | /* duplicate ! don't insert it */ |
| 1987 | write_unlock(&devtree_lock); |
| 1988 | return -1; |
| 1989 | } |
| 1990 | next = &(*next)->next; |
| 1991 | } |
| 1992 | *next = prop; |
| 1993 | write_unlock(&devtree_lock); |
| 1994 | |
| 1995 | /* try to add to proc as well if it was initialized */ |
| 1996 | if (np->pde) |
| 1997 | proc_device_tree_add_prop(np->pde, prop); |
| 1998 | |
| 1999 | return 0; |
| 2000 | } |
| 2001 | |
| 2002 | /* I quickly hacked that one, check against spec ! */ |
| 2003 | static inline unsigned long |
| 2004 | bus_space_to_resource_flags(unsigned int bus_space) |
| 2005 | { |
| 2006 | u8 space = (bus_space >> 24) & 0xf; |
| 2007 | if (space == 0) |
| 2008 | space = 0x02; |
| 2009 | if (space == 0x02) |
| 2010 | return IORESOURCE_MEM; |
| 2011 | else if (space == 0x01) |
| 2012 | return IORESOURCE_IO; |
| 2013 | else { |
| 2014 | printk(KERN_WARNING "prom.c: bus_space_to_resource_flags(), space: %x\n", |
| 2015 | bus_space); |
| 2016 | return 0; |
| 2017 | } |
| 2018 | } |
| 2019 | |
| 2020 | #ifdef CONFIG_PCI |
| 2021 | static struct resource *find_parent_pci_resource(struct pci_dev* pdev, |
| 2022 | struct address_range *range) |
| 2023 | { |
| 2024 | unsigned long mask; |
| 2025 | int i; |
| 2026 | |
| 2027 | /* Check this one */ |
| 2028 | mask = bus_space_to_resource_flags(range->space); |
| 2029 | for (i=0; i<DEVICE_COUNT_RESOURCE; i++) { |
| 2030 | if ((pdev->resource[i].flags & mask) == mask && |
| 2031 | pdev->resource[i].start <= range->address && |
| 2032 | pdev->resource[i].end > range->address) { |
| 2033 | if ((range->address + range->size - 1) > pdev->resource[i].end) { |
| 2034 | /* Add better message */ |
| 2035 | printk(KERN_WARNING "PCI/OF resource overlap !\n"); |
| 2036 | return NULL; |
| 2037 | } |
| 2038 | break; |
| 2039 | } |
| 2040 | } |
| 2041 | if (i == DEVICE_COUNT_RESOURCE) |
| 2042 | return NULL; |
| 2043 | return &pdev->resource[i]; |
| 2044 | } |
| 2045 | |
| 2046 | /* |
| 2047 | * Request an OF device resource. Currently handles child of PCI devices, |
| 2048 | * or other nodes attached to the root node. Ultimately, put some |
| 2049 | * link to resources in the OF node. |
| 2050 | */ |
| 2051 | struct resource *request_OF_resource(struct device_node* node, int index, |
| 2052 | const char* name_postfix) |
| 2053 | { |
| 2054 | struct pci_dev* pcidev; |
| 2055 | u8 pci_bus, pci_devfn; |
| 2056 | unsigned long iomask; |
| 2057 | struct device_node* nd; |
| 2058 | struct resource* parent; |
| 2059 | struct resource *res = NULL; |
| 2060 | int nlen, plen; |
| 2061 | |
| 2062 | if (index >= node->n_addrs) |
| 2063 | goto fail; |
| 2064 | |
| 2065 | /* Sanity check on bus space */ |
| 2066 | iomask = bus_space_to_resource_flags(node->addrs[index].space); |
| 2067 | if (iomask & IORESOURCE_MEM) |
| 2068 | parent = &iomem_resource; |
| 2069 | else if (iomask & IORESOURCE_IO) |
| 2070 | parent = &ioport_resource; |
| 2071 | else |
| 2072 | goto fail; |
| 2073 | |
| 2074 | /* Find a PCI parent if any */ |
| 2075 | nd = node; |
| 2076 | pcidev = NULL; |
| 2077 | while (nd) { |
| 2078 | if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) |
| 2079 | pcidev = pci_find_slot(pci_bus, pci_devfn); |
| 2080 | if (pcidev) break; |
| 2081 | nd = nd->parent; |
| 2082 | } |
| 2083 | if (pcidev) |
| 2084 | parent = find_parent_pci_resource(pcidev, &node->addrs[index]); |
| 2085 | if (!parent) { |
| 2086 | printk(KERN_WARNING "request_OF_resource(%s), parent not found\n", |
| 2087 | node->name); |
| 2088 | goto fail; |
| 2089 | } |
| 2090 | |
| 2091 | res = __request_region(parent, node->addrs[index].address, |
| 2092 | node->addrs[index].size, NULL); |
| 2093 | if (!res) |
| 2094 | goto fail; |
| 2095 | nlen = strlen(node->name); |
| 2096 | plen = name_postfix ? strlen(name_postfix) : 0; |
| 2097 | res->name = (const char *)kmalloc(nlen+plen+1, GFP_KERNEL); |
| 2098 | if (res->name) { |
| 2099 | strcpy((char *)res->name, node->name); |
| 2100 | if (plen) |
| 2101 | strcpy((char *)res->name+nlen, name_postfix); |
| 2102 | } |
| 2103 | return res; |
| 2104 | fail: |
| 2105 | return NULL; |
| 2106 | } |
| 2107 | EXPORT_SYMBOL(request_OF_resource); |
| 2108 | |
| 2109 | int release_OF_resource(struct device_node *node, int index) |
| 2110 | { |
| 2111 | struct pci_dev* pcidev; |
| 2112 | u8 pci_bus, pci_devfn; |
| 2113 | unsigned long iomask, start, end; |
| 2114 | struct device_node* nd; |
| 2115 | struct resource* parent; |
| 2116 | struct resource *res = NULL; |
| 2117 | |
| 2118 | if (index >= node->n_addrs) |
| 2119 | return -EINVAL; |
| 2120 | |
| 2121 | /* Sanity check on bus space */ |
| 2122 | iomask = bus_space_to_resource_flags(node->addrs[index].space); |
| 2123 | if (iomask & IORESOURCE_MEM) |
| 2124 | parent = &iomem_resource; |
| 2125 | else if (iomask & IORESOURCE_IO) |
| 2126 | parent = &ioport_resource; |
| 2127 | else |
| 2128 | return -EINVAL; |
| 2129 | |
| 2130 | /* Find a PCI parent if any */ |
| 2131 | nd = node; |
| 2132 | pcidev = NULL; |
| 2133 | while(nd) { |
| 2134 | if (!pci_device_from_OF_node(nd, &pci_bus, &pci_devfn)) |
| 2135 | pcidev = pci_find_slot(pci_bus, pci_devfn); |
| 2136 | if (pcidev) break; |
| 2137 | nd = nd->parent; |
| 2138 | } |
| 2139 | if (pcidev) |
| 2140 | parent = find_parent_pci_resource(pcidev, &node->addrs[index]); |
| 2141 | if (!parent) { |
| 2142 | printk(KERN_WARNING "release_OF_resource(%s), parent not found\n", |
| 2143 | node->name); |
| 2144 | return -ENODEV; |
| 2145 | } |
| 2146 | |
| 2147 | /* Find us in the parent and its childs */ |
| 2148 | res = parent->child; |
| 2149 | start = node->addrs[index].address; |
| 2150 | end = start + node->addrs[index].size - 1; |
| 2151 | while (res) { |
| 2152 | if (res->start == start && res->end == end && |
| 2153 | (res->flags & IORESOURCE_BUSY)) |
| 2154 | break; |
| 2155 | if (res->start <= start && res->end >= end) |
| 2156 | res = res->child; |
| 2157 | else |
| 2158 | res = res->sibling; |
| 2159 | } |
| 2160 | if (!res) |
| 2161 | return -ENODEV; |
| 2162 | |
| 2163 | if (res->name) { |
| 2164 | kfree(res->name); |
| 2165 | res->name = NULL; |
| 2166 | } |
| 2167 | release_resource(res); |
| 2168 | kfree(res); |
| 2169 | |
| 2170 | return 0; |
| 2171 | } |
| 2172 | EXPORT_SYMBOL(release_OF_resource); |
| 2173 | #endif /* CONFIG_PCI */ |