1/* 2 * inventory.c 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Copyright (c) 1999 The Puffin Group (David Kennedy and Alex deVries) 10 * Copyright (c) 2001 Matthew Wilcox for Hewlett-Packard 11 * 12 * These are the routines to discover what hardware exists in this box. 13 * This task is complicated by there being 3 different ways of 14 * performing an inventory, depending largely on the age of the box. 15 * The recommended way to do this is to check to see whether the machine 16 * is a `Snake' first, then try System Map, then try PAT. We try System 17 * Map before checking for a Snake -- this probably doesn't cause any 18 * problems, but... 19 */ 20 21#include <linux/types.h> 22#include <linux/kernel.h> 23#include <linux/init.h> 24#include <linux/slab.h> 25#include <linux/mm.h> 26#include <asm/hardware.h> 27#include <asm/io.h> 28#include <asm/mmzone.h> 29#include <asm/pdc.h> 30#include <asm/pdcpat.h> 31#include <asm/processor.h> 32#include <asm/page.h> 33#include <asm/parisc-device.h> 34 35/* 36** Debug options 37** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices. 38*/ 39#undef DEBUG_PAT 40 41int pdc_type __read_mostly = PDC_TYPE_ILLEGAL; 42 43void __init setup_pdc(void) 44{ 45 long status; 46 unsigned int bus_id; 47 struct pdc_system_map_mod_info module_result; 48 struct pdc_module_path module_path; 49 struct pdc_model model; 50#ifdef CONFIG_64BIT 51 struct pdc_pat_cell_num cell_info; 52#endif 53 54 /* Determine the pdc "type" used on this machine */ 55 56 printk(KERN_INFO "Determining PDC firmware type: "); 57 58 status = pdc_system_map_find_mods(&module_result, &module_path, 0); 59 if (status == PDC_OK) { 60 pdc_type = PDC_TYPE_SYSTEM_MAP; 61 printk("System Map.\n"); 62 return; 63 } 64 65 /* 66 * If the machine doesn't support PDC_SYSTEM_MAP then either it 67 * is a pdc pat box, or it is an older box. All 64 bit capable 68 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP. 69 */ 70 71 /* 72 * TODO: We should test for 64 bit capability and give a 73 * clearer message. 74 */ 75 76#ifdef CONFIG_64BIT 77 status = pdc_pat_cell_get_number(&cell_info); 78 if (status == PDC_OK) { 79 pdc_type = PDC_TYPE_PAT; 80 printk("64 bit PAT.\n"); 81 return; 82 } 83#endif 84 85 /* Check the CPU's bus ID. There's probably a better test. */ 86 87 status = pdc_model_info(&model); 88 89 bus_id = (model.hversion >> (4 + 7)) & 0x1f; 90 91 switch (bus_id) { 92 case 0x4: /* 720, 730, 750, 735, 755 */ 93 case 0x6: /* 705, 710 */ 94 case 0x7: /* 715, 725 */ 95 case 0x8: /* 745, 747, 742 */ 96 case 0xA: /* 712 and similiar */ 97 case 0xC: /* 715/64, at least */ 98 99 pdc_type = PDC_TYPE_SNAKE; 100 printk("Snake.\n"); 101 return; 102 103 default: /* Everything else */ 104 105 printk("Unsupported.\n"); 106 panic("If this is a 64-bit machine, please try a 64-bit kernel.\n"); 107 } 108} 109 110#define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */ 111 112static void __init 113set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start, 114 unsigned long pages4k) 115{ 116 /* Rather than aligning and potentially throwing away 117 * memory, we'll assume that any ranges are already 118 * nicely aligned with any reasonable page size, and 119 * panic if they are not (it's more likely that the 120 * pdc info is bad in this case). 121 */ 122 123 if (unlikely( ((start & (PAGE_SIZE - 1)) != 0) 124 || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) { 125 126 panic("Memory range doesn't align with page size!\n"); 127 } 128 129 pmem_ptr->start_pfn = (start >> PAGE_SHIFT); 130 pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT); 131} 132 133static void __init pagezero_memconfig(void) 134{ 135 unsigned long npages; 136 137 /* Use the 32 bit information from page zero to create a single 138 * entry in the pmem_ranges[] table. 139 * 140 * We currently don't support machines with contiguous memory 141 * >= 4 Gb, who report that memory using 64 bit only fields 142 * on page zero. It's not worth doing until it can be tested, 143 * and it is not clear we can support those machines for other 144 * reasons. 145 * 146 * If that support is done in the future, this is where it 147 * should be done. 148 */ 149 150 npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT); 151 set_pmem_entry(pmem_ranges,0UL,npages); 152 npmem_ranges = 1; 153} 154 155#ifdef CONFIG_64BIT 156 157/* All of the PDC PAT specific code is 64-bit only */ 158 159/* 160** The module object is filled via PDC_PAT_CELL[Return Cell Module]. 161** If a module is found, register module will get the IODC bytes via 162** pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter. 163** 164** The IO view can be used by PDC_PAT_CELL[Return Cell Module] 165** only for SBAs and LBAs. This view will cause an invalid 166** argument error for all other cell module types. 167** 168*/ 169 170static int __init 171pat_query_module(ulong pcell_loc, ulong mod_index) 172{ 173 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell; 174 unsigned long bytecnt; 175 unsigned long temp; /* 64-bit scratch value */ 176 long status; /* PDC return value status */ 177 struct parisc_device *dev; 178 179 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL); 180 if (!pa_pdc_cell) 181 panic("couldn't allocate memory for PDC_PAT_CELL!"); 182 183 /* return cell module (PA or Processor view) */ 184 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 185 PA_VIEW, pa_pdc_cell); 186 187 if (status != PDC_OK) { 188 /* no more cell modules or error */ 189 return status; 190 } 191 192 temp = pa_pdc_cell->cba; 193 dev = alloc_pa_dev(PAT_GET_CBA(temp), &(pa_pdc_cell->mod_path)); 194 if (!dev) { 195 return PDC_OK; 196 } 197 198 /* alloc_pa_dev sets dev->hpa */ 199 200 /* 201 ** save parameters in the parisc_device 202 ** (The idea being the device driver will call pdc_pat_cell_module() 203 ** and store the results in its own data structure.) 204 */ 205 dev->pcell_loc = pcell_loc; 206 dev->mod_index = mod_index; 207 208 /* save generic info returned from the call */ 209 /* REVISIT: who is the consumer of this? not sure yet... */ 210 dev->mod_info = pa_pdc_cell->mod_info; /* pass to PAT_GET_ENTITY() */ 211 dev->pmod_loc = pa_pdc_cell->mod_location; 212 213 register_parisc_device(dev); /* advertise device */ 214 215#ifdef DEBUG_PAT 216 pdc_pat_cell_mod_maddr_block_t io_pdc_cell; 217 /* dump what we see so far... */ 218 switch (PAT_GET_ENTITY(dev->mod_info)) { 219 unsigned long i; 220 221 case PAT_ENTITY_PROC: 222 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n", 223 pa_pdc_cell->mod[0]); 224 break; 225 226 case PAT_ENTITY_MEM: 227 printk(KERN_DEBUG 228 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n", 229 pa_pdc_cell->mod[0], pa_pdc_cell->mod[1], 230 pa_pdc_cell->mod[2]); 231 break; 232 case PAT_ENTITY_CA: 233 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc); 234 break; 235 236 case PAT_ENTITY_PBC: 237 printk(KERN_DEBUG "PAT_ENTITY_PBC: "); 238 goto print_ranges; 239 240 case PAT_ENTITY_SBA: 241 printk(KERN_DEBUG "PAT_ENTITY_SBA: "); 242 goto print_ranges; 243 244 case PAT_ENTITY_LBA: 245 printk(KERN_DEBUG "PAT_ENTITY_LBA: "); 246 247 print_ranges: 248 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 249 IO_VIEW, &io_pdc_cell); 250 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell->mod[1]); 251 for (i = 0; i < pa_pdc_cell->mod[1]; i++) { 252 printk(KERN_DEBUG 253 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 254 i, pa_pdc_cell->mod[2 + i * 3], /* type */ 255 pa_pdc_cell->mod[3 + i * 3], /* start */ 256 pa_pdc_cell->mod[4 + i * 3]); /* finish (ie end) */ 257 printk(KERN_DEBUG 258 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 259 i, io_pdc_cell->mod[2 + i * 3], /* type */ 260 io_pdc_cell->mod[3 + i * 3], /* start */ 261 io_pdc_cell->mod[4 + i * 3]); /* finish (ie end) */ 262 } 263 printk(KERN_DEBUG "\n"); 264 break; 265 } 266#endif /* DEBUG_PAT */ 267 268 kfree(pa_pdc_cell); 269 270 return PDC_OK; 271} 272 273 274/* pat pdc can return information about a variety of different 275 * types of memory (e.g. firmware,i/o, etc) but we only care about 276 * the usable physical ram right now. Since the firmware specific 277 * information is allocated on the stack, we'll be generous, in 278 * case there is a lot of other information we don't care about. 279 */ 280 281#define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES) 282 283static void __init pat_memconfig(void) 284{ 285 unsigned long actual_len; 286 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1]; 287 struct pdc_pat_pd_addr_map_entry *mtbl_ptr; 288 physmem_range_t *pmem_ptr; 289 long status; 290 int entries; 291 unsigned long length; 292 int i; 293 294 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry); 295 296 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L); 297 298 if ((status != PDC_OK) 299 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) { 300 301 /* The above pdc call shouldn't fail, but, just in 302 * case, just use the PAGE0 info. 303 */ 304 305 printk("\n\n\n"); 306 printk(KERN_WARNING "WARNING! Could not get full memory configuration. " 307 "All memory may not be used!\n\n\n"); 308 pagezero_memconfig(); 309 return; 310 } 311 312 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry); 313 314 if (entries > PAT_MAX_RANGES) { 315 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 316 printk(KERN_WARNING "Some memory may not be used!\n"); 317 } 318 319 /* Copy information into the firmware independent pmem_ranges 320 * array, skipping types we don't care about. Notice we said 321 * "may" above. We'll use all the entries that were returned. 322 */ 323 324 npmem_ranges = 0; 325 mtbl_ptr = mem_table; 326 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 327 for (i = 0; i < entries; i++,mtbl_ptr++) { 328 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR) 329 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY) 330 || (mtbl_ptr->pages == 0) 331 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL) 332 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI) 333 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) { 334 335 continue; 336 } 337 338 if (npmem_ranges == MAX_PHYSMEM_RANGES) { 339 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 340 printk(KERN_WARNING "Some memory will not be used!\n"); 341 break; 342 } 343 344 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 345 npmem_ranges++; 346 } 347} 348 349static int __init pat_inventory(void) 350{ 351 int status; 352 ulong mod_index = 0; 353 struct pdc_pat_cell_num cell_info; 354 355 /* 356 ** Note: Prelude (and it's successors: Lclass, A400/500) only 357 ** implement PDC_PAT_CELL sub-options 0 and 2. 358 */ 359 status = pdc_pat_cell_get_number(&cell_info); 360 if (status != PDC_OK) { 361 return 0; 362 } 363 364#ifdef DEBUG_PAT 365 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 366 cell_info.cell_loc); 367#endif 368 369 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) { 370 mod_index++; 371 } 372 373 return mod_index; 374} 375 376/* We only look for extended memory ranges on a 64 bit capable box */ 377static void __init sprockets_memconfig(void) 378{ 379 struct pdc_memory_table_raddr r_addr; 380 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES]; 381 struct pdc_memory_table *mtbl_ptr; 382 physmem_range_t *pmem_ptr; 383 long status; 384 int entries; 385 int i; 386 387 status = pdc_mem_mem_table(&r_addr,mem_table, 388 (unsigned long)MAX_PHYSMEM_RANGES); 389 390 if (status != PDC_OK) { 391 392 /* The above pdc call only works on boxes with sprockets 393 * firmware (newer B,C,J class). Other non PAT PDC machines 394 * do support more than 3.75 Gb of memory, but we don't 395 * support them yet. 396 */ 397 398 pagezero_memconfig(); 399 return; 400 } 401 402 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) { 403 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 404 printk(KERN_WARNING "Some memory will not be used!\n"); 405 } 406 407 entries = (int)r_addr.entries_returned; 408 409 npmem_ranges = 0; 410 mtbl_ptr = mem_table; 411 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 412 for (i = 0; i < entries; i++,mtbl_ptr++) { 413 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 414 npmem_ranges++; 415 } 416} 417 418#else /* !CONFIG_64BIT */ 419 420#define pat_inventory() do { } while (0) 421#define pat_memconfig() do { } while (0) 422#define sprockets_memconfig() pagezero_memconfig() 423 424#endif /* !CONFIG_64BIT */ 425 426 427#ifndef CONFIG_PA20 428 429/* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */ 430 431static struct parisc_device * __init 432legacy_create_device(struct pdc_memory_map *r_addr, 433 struct pdc_module_path *module_path) 434{ 435 struct parisc_device *dev; 436 int status = pdc_mem_map_hpa(r_addr, module_path); 437 if (status != PDC_OK) 438 return NULL; 439 440 dev = alloc_pa_dev(r_addr->hpa, &module_path->path); 441 if (dev == NULL) 442 return NULL; 443 444 register_parisc_device(dev); 445 return dev; 446} 447 448/** 449 * snake_inventory 450 * 451 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used. 452 * To use it, we initialise the mod_path.bc to 0xff and try all values of 453 * mod to get the HPA for the top-level devices. Bus adapters may have 454 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the 455 * module, then trying all possible functions. 456 */ 457static void __init snake_inventory(void) 458{ 459 int mod; 460 for (mod = 0; mod < 16; mod++) { 461 struct parisc_device *dev; 462 struct pdc_module_path module_path; 463 struct pdc_memory_map r_addr; 464 unsigned int func; 465 466 memset(module_path.path.bc, 0xff, 6); 467 module_path.path.mod = mod; 468 dev = legacy_create_device(&r_addr, &module_path); 469 if ((!dev) || (dev->id.hw_type != HPHW_BA)) 470 continue; 471 472 memset(module_path.path.bc, 0xff, 4); 473 module_path.path.bc[4] = mod; 474 475 for (func = 0; func < 16; func++) { 476 module_path.path.bc[5] = 0; 477 module_path.path.mod = func; 478 legacy_create_device(&r_addr, &module_path); 479 } 480 } 481} 482 483#else /* CONFIG_PA20 */ 484#define snake_inventory() do { } while (0) 485#endif /* CONFIG_PA20 */ 486 487/* Common 32/64 bit based code goes here */ 488 489/** 490 * add_system_map_addresses - Add additional addresses to the parisc device. 491 * @dev: The parisc device. 492 * @num_addrs: Then number of addresses to add; 493 * @module_instance: The system_map module instance. 494 * 495 * This function adds any additional addresses reported by the system_map 496 * firmware to the parisc device. 497 */ 498static void __init 499add_system_map_addresses(struct parisc_device *dev, int num_addrs, 500 int module_instance) 501{ 502 int i; 503 long status; 504 struct pdc_system_map_addr_info addr_result; 505 506 dev->addr = kmalloc(num_addrs * sizeof(unsigned long), GFP_KERNEL); 507 if(!dev->addr) { 508 printk(KERN_ERR "%s %s(): memory allocation failure\n", 509 __FILE__, __func__); 510 return; 511 } 512 513 for(i = 1; i <= num_addrs; ++i) { 514 status = pdc_system_map_find_addrs(&addr_result, 515 module_instance, i); 516 if(PDC_OK == status) { 517 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr; 518 dev->num_addrs++; 519 } else { 520 printk(KERN_WARNING 521 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n", 522 status, i); 523 } 524 } 525} 526 527/** 528 * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP. 529 * 530 * This function attempts to retrieve and register all the devices firmware 531 * knows about via the SYSTEM_MAP PDC call. 532 */ 533static void __init system_map_inventory(void) 534{ 535 int i; 536 long status = PDC_OK; 537 538 for (i = 0; i < 256; i++) { 539 struct parisc_device *dev; 540 struct pdc_system_map_mod_info module_result; 541 struct pdc_module_path module_path; 542 543 status = pdc_system_map_find_mods(&module_result, 544 &module_path, i); 545 if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD)) 546 break; 547 if (status != PDC_OK) 548 continue; 549 550 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path); 551 if (!dev) 552 continue; 553 554 register_parisc_device(dev); 555 556 /* if available, get the additional addresses for a module */ 557 if (!module_result.add_addrs) 558 continue; 559 560 add_system_map_addresses(dev, module_result.add_addrs, i); 561 } 562 563 walk_central_bus(); 564 return; 565} 566 567void __init do_memory_inventory(void) 568{ 569 switch (pdc_type) { 570 571 case PDC_TYPE_PAT: 572 pat_memconfig(); 573 break; 574 575 case PDC_TYPE_SYSTEM_MAP: 576 sprockets_memconfig(); 577 break; 578 579 case PDC_TYPE_SNAKE: 580 pagezero_memconfig(); 581 return; 582 583 default: 584 panic("Unknown PDC type!\n"); 585 } 586 587 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) { 588 printk(KERN_WARNING "Bad memory configuration returned!\n"); 589 printk(KERN_WARNING "Some memory may not be used!\n"); 590 pagezero_memconfig(); 591 } 592} 593 594void __init do_device_inventory(void) 595{ 596 printk(KERN_INFO "Searching for devices...\n"); 597 598 init_parisc_bus(); 599 600 switch (pdc_type) { 601 602 case PDC_TYPE_PAT: 603 pat_inventory(); 604 break; 605 606 case PDC_TYPE_SYSTEM_MAP: 607 system_map_inventory(); 608 break; 609 610 case PDC_TYPE_SNAKE: 611 snake_inventory(); 612 break; 613 614 default: 615 panic("Unknown PDC type!\n"); 616 } 617 printk(KERN_INFO "Found devices:\n"); 618 print_parisc_devices(); 619} 620