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 41 int pdc_type __read_mostly = PDC_TYPE_ILLEGAL; 42 43 /* cell number and location (PAT firmware only) */ 44 unsigned long parisc_cell_num __read_mostly; 45 unsigned long parisc_cell_loc __read_mostly; 46 unsigned long parisc_pat_pdc_cap __read_mostly; 47 48 49 void __init setup_pdc(void) 50 { 51 long status; 52 unsigned int bus_id; 53 struct pdc_system_map_mod_info module_result; 54 struct pdc_module_path module_path; 55 struct pdc_model model; 56 #ifdef CONFIG_64BIT 57 struct pdc_pat_cell_num cell_info; 58 #endif 59 60 /* Determine the pdc "type" used on this machine */ 61 62 printk(KERN_INFO "Determining PDC firmware type: "); 63 64 status = pdc_system_map_find_mods(&module_result, &module_path, 0); 65 if (status == PDC_OK) { 66 pdc_type = PDC_TYPE_SYSTEM_MAP; 67 pr_cont("System Map.\n"); 68 return; 69 } 70 71 /* 72 * If the machine doesn't support PDC_SYSTEM_MAP then either it 73 * is a pdc pat box, or it is an older box. All 64 bit capable 74 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP. 75 */ 76 77 /* 78 * TODO: We should test for 64 bit capability and give a 79 * clearer message. 80 */ 81 82 #ifdef CONFIG_64BIT 83 status = pdc_pat_cell_get_number(&cell_info); 84 if (status == PDC_OK) { 85 unsigned long legacy_rev, pat_rev; 86 pdc_type = PDC_TYPE_PAT; 87 pr_cont("64 bit PAT.\n"); 88 parisc_cell_num = cell_info.cell_num; 89 parisc_cell_loc = cell_info.cell_loc; 90 pr_info("PAT: Running on cell %lu and location %lu.\n", 91 parisc_cell_num, parisc_cell_loc); 92 status = pdc_pat_pd_get_pdc_revisions(&legacy_rev, 93 &pat_rev, &parisc_pat_pdc_cap); 94 pr_info("PAT: legacy revision 0x%lx, pat_rev 0x%lx, pdc_cap 0x%lx, S-PTLB %d, HPMC_RENDEZ %d.\n", 95 legacy_rev, pat_rev, parisc_pat_pdc_cap, 96 parisc_pat_pdc_cap 97 & PDC_PAT_CAPABILITY_BIT_SIMULTANEOUS_PTLB ? 1:0, 98 parisc_pat_pdc_cap 99 & PDC_PAT_CAPABILITY_BIT_PDC_HPMC_RENDEZ ? 1:0); 100 return; 101 } 102 #endif 103 104 /* Check the CPU's bus ID. There's probably a better test. */ 105 106 status = pdc_model_info(&model); 107 108 bus_id = (model.hversion >> (4 + 7)) & 0x1f; 109 110 switch (bus_id) { 111 case 0x4: /* 720, 730, 750, 735, 755 */ 112 case 0x6: /* 705, 710 */ 113 case 0x7: /* 715, 725 */ 114 case 0x8: /* 745, 747, 742 */ 115 case 0xA: /* 712 and similar */ 116 case 0xC: /* 715/64, at least */ 117 118 pdc_type = PDC_TYPE_SNAKE; 119 pr_cont("Snake.\n"); 120 return; 121 122 default: /* Everything else */ 123 124 pr_cont("Unsupported.\n"); 125 panic("If this is a 64-bit machine, please try a 64-bit kernel.\n"); 126 } 127 } 128 129 #define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */ 130 131 static void __init 132 set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start, 133 unsigned long pages4k) 134 { 135 /* Rather than aligning and potentially throwing away 136 * memory, we'll assume that any ranges are already 137 * nicely aligned with any reasonable page size, and 138 * panic if they are not (it's more likely that the 139 * pdc info is bad in this case). 140 */ 141 142 if (unlikely( ((start & (PAGE_SIZE - 1)) != 0) 143 || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) { 144 145 panic("Memory range doesn't align with page size!\n"); 146 } 147 148 pmem_ptr->start_pfn = (start >> PAGE_SHIFT); 149 pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT); 150 } 151 152 static void __init pagezero_memconfig(void) 153 { 154 unsigned long npages; 155 156 /* Use the 32 bit information from page zero to create a single 157 * entry in the pmem_ranges[] table. 158 * 159 * We currently don't support machines with contiguous memory 160 * >= 4 Gb, who report that memory using 64 bit only fields 161 * on page zero. It's not worth doing until it can be tested, 162 * and it is not clear we can support those machines for other 163 * reasons. 164 * 165 * If that support is done in the future, this is where it 166 * should be done. 167 */ 168 169 npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT); 170 set_pmem_entry(pmem_ranges,0UL,npages); 171 npmem_ranges = 1; 172 } 173 174 #ifdef CONFIG_64BIT 175 176 /* All of the PDC PAT specific code is 64-bit only */ 177 178 /* 179 ** The module object is filled via PDC_PAT_CELL[Return Cell Module]. 180 ** If a module is found, register module will get the IODC bytes via 181 ** pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter. 182 ** 183 ** The IO view can be used by PDC_PAT_CELL[Return Cell Module] 184 ** only for SBAs and LBAs. This view will cause an invalid 185 ** argument error for all other cell module types. 186 ** 187 */ 188 189 static int __init 190 pat_query_module(ulong pcell_loc, ulong mod_index) 191 { 192 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell; 193 unsigned long bytecnt; 194 unsigned long temp; /* 64-bit scratch value */ 195 long status; /* PDC return value status */ 196 struct parisc_device *dev; 197 198 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL); 199 if (!pa_pdc_cell) 200 panic("couldn't allocate memory for PDC_PAT_CELL!"); 201 202 /* return cell module (PA or Processor view) */ 203 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 204 PA_VIEW, pa_pdc_cell); 205 206 if (status != PDC_OK) { 207 /* no more cell modules or error */ 208 kfree(pa_pdc_cell); 209 return status; 210 } 211 212 temp = pa_pdc_cell->cba; 213 dev = alloc_pa_dev(PAT_GET_CBA(temp), &(pa_pdc_cell->mod_path)); 214 if (!dev) { 215 kfree(pa_pdc_cell); 216 return PDC_OK; 217 } 218 219 /* alloc_pa_dev sets dev->hpa */ 220 221 /* 222 ** save parameters in the parisc_device 223 ** (The idea being the device driver will call pdc_pat_cell_module() 224 ** and store the results in its own data structure.) 225 */ 226 dev->pcell_loc = pcell_loc; 227 dev->mod_index = mod_index; 228 229 /* save generic info returned from the call */ 230 /* REVISIT: who is the consumer of this? not sure yet... */ 231 dev->mod_info = pa_pdc_cell->mod_info; /* pass to PAT_GET_ENTITY() */ 232 dev->pmod_loc = pa_pdc_cell->mod_location; 233 dev->mod0 = pa_pdc_cell->mod[0]; 234 235 register_parisc_device(dev); /* advertise device */ 236 237 #ifdef DEBUG_PAT 238 /* dump what we see so far... */ 239 switch (PAT_GET_ENTITY(dev->mod_info)) { 240 pdc_pat_cell_mod_maddr_block_t io_pdc_cell; 241 unsigned long i; 242 243 case PAT_ENTITY_PROC: 244 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n", 245 pa_pdc_cell->mod[0]); 246 break; 247 248 case PAT_ENTITY_MEM: 249 printk(KERN_DEBUG 250 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n", 251 pa_pdc_cell->mod[0], pa_pdc_cell->mod[1], 252 pa_pdc_cell->mod[2]); 253 break; 254 case PAT_ENTITY_CA: 255 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc); 256 break; 257 258 case PAT_ENTITY_PBC: 259 printk(KERN_DEBUG "PAT_ENTITY_PBC: "); 260 goto print_ranges; 261 262 case PAT_ENTITY_SBA: 263 printk(KERN_DEBUG "PAT_ENTITY_SBA: "); 264 goto print_ranges; 265 266 case PAT_ENTITY_LBA: 267 printk(KERN_DEBUG "PAT_ENTITY_LBA: "); 268 269 print_ranges: 270 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 271 IO_VIEW, &io_pdc_cell); 272 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell->mod[1]); 273 for (i = 0; i < pa_pdc_cell->mod[1]; i++) { 274 printk(KERN_DEBUG 275 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 276 i, pa_pdc_cell->mod[2 + i * 3], /* type */ 277 pa_pdc_cell->mod[3 + i * 3], /* start */ 278 pa_pdc_cell->mod[4 + i * 3]); /* finish (ie end) */ 279 printk(KERN_DEBUG 280 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 281 i, io_pdc_cell.mod[2 + i * 3], /* type */ 282 io_pdc_cell.mod[3 + i * 3], /* start */ 283 io_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */ 284 } 285 printk(KERN_DEBUG "\n"); 286 break; 287 } 288 #endif /* DEBUG_PAT */ 289 290 kfree(pa_pdc_cell); 291 292 return PDC_OK; 293 } 294 295 296 /* pat pdc can return information about a variety of different 297 * types of memory (e.g. firmware,i/o, etc) but we only care about 298 * the usable physical ram right now. Since the firmware specific 299 * information is allocated on the stack, we'll be generous, in 300 * case there is a lot of other information we don't care about. 301 */ 302 303 #define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES) 304 305 static void __init pat_memconfig(void) 306 { 307 unsigned long actual_len; 308 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1]; 309 struct pdc_pat_pd_addr_map_entry *mtbl_ptr; 310 physmem_range_t *pmem_ptr; 311 long status; 312 int entries; 313 unsigned long length; 314 int i; 315 316 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry); 317 318 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L); 319 320 if ((status != PDC_OK) 321 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) { 322 323 /* The above pdc call shouldn't fail, but, just in 324 * case, just use the PAGE0 info. 325 */ 326 327 printk("\n\n\n"); 328 printk(KERN_WARNING "WARNING! Could not get full memory configuration. " 329 "All memory may not be used!\n\n\n"); 330 pagezero_memconfig(); 331 return; 332 } 333 334 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry); 335 336 if (entries > PAT_MAX_RANGES) { 337 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 338 printk(KERN_WARNING "Some memory may not be used!\n"); 339 } 340 341 /* Copy information into the firmware independent pmem_ranges 342 * array, skipping types we don't care about. Notice we said 343 * "may" above. We'll use all the entries that were returned. 344 */ 345 346 npmem_ranges = 0; 347 mtbl_ptr = mem_table; 348 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 349 for (i = 0; i < entries; i++,mtbl_ptr++) { 350 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR) 351 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY) 352 || (mtbl_ptr->pages == 0) 353 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL) 354 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI) 355 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) { 356 357 continue; 358 } 359 360 if (npmem_ranges == MAX_PHYSMEM_RANGES) { 361 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 362 printk(KERN_WARNING "Some memory will not be used!\n"); 363 break; 364 } 365 366 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 367 npmem_ranges++; 368 } 369 } 370 371 static int __init pat_inventory(void) 372 { 373 int status; 374 ulong mod_index = 0; 375 struct pdc_pat_cell_num cell_info; 376 377 /* 378 ** Note: Prelude (and it's successors: Lclass, A400/500) only 379 ** implement PDC_PAT_CELL sub-options 0 and 2. 380 */ 381 status = pdc_pat_cell_get_number(&cell_info); 382 if (status != PDC_OK) { 383 return 0; 384 } 385 386 #ifdef DEBUG_PAT 387 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 388 cell_info.cell_loc); 389 #endif 390 391 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) { 392 mod_index++; 393 } 394 395 return mod_index; 396 } 397 398 /* We only look for extended memory ranges on a 64 bit capable box */ 399 static void __init sprockets_memconfig(void) 400 { 401 struct pdc_memory_table_raddr r_addr; 402 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES]; 403 struct pdc_memory_table *mtbl_ptr; 404 physmem_range_t *pmem_ptr; 405 long status; 406 int entries; 407 int i; 408 409 status = pdc_mem_mem_table(&r_addr,mem_table, 410 (unsigned long)MAX_PHYSMEM_RANGES); 411 412 if (status != PDC_OK) { 413 414 /* The above pdc call only works on boxes with sprockets 415 * firmware (newer B,C,J class). Other non PAT PDC machines 416 * do support more than 3.75 Gb of memory, but we don't 417 * support them yet. 418 */ 419 420 pagezero_memconfig(); 421 return; 422 } 423 424 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) { 425 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 426 printk(KERN_WARNING "Some memory will not be used!\n"); 427 } 428 429 entries = (int)r_addr.entries_returned; 430 431 npmem_ranges = 0; 432 mtbl_ptr = mem_table; 433 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 434 for (i = 0; i < entries; i++,mtbl_ptr++) { 435 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 436 npmem_ranges++; 437 } 438 } 439 440 #else /* !CONFIG_64BIT */ 441 442 #define pat_inventory() do { } while (0) 443 #define pat_memconfig() do { } while (0) 444 #define sprockets_memconfig() pagezero_memconfig() 445 446 #endif /* !CONFIG_64BIT */ 447 448 449 #ifndef CONFIG_PA20 450 451 /* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */ 452 453 static struct parisc_device * __init 454 legacy_create_device(struct pdc_memory_map *r_addr, 455 struct pdc_module_path *module_path) 456 { 457 struct parisc_device *dev; 458 int status = pdc_mem_map_hpa(r_addr, module_path); 459 if (status != PDC_OK) 460 return NULL; 461 462 dev = alloc_pa_dev(r_addr->hpa, &module_path->path); 463 if (dev == NULL) 464 return NULL; 465 466 register_parisc_device(dev); 467 return dev; 468 } 469 470 /** 471 * snake_inventory 472 * 473 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used. 474 * To use it, we initialise the mod_path.bc to 0xff and try all values of 475 * mod to get the HPA for the top-level devices. Bus adapters may have 476 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the 477 * module, then trying all possible functions. 478 */ 479 static void __init snake_inventory(void) 480 { 481 int mod; 482 for (mod = 0; mod < 16; mod++) { 483 struct parisc_device *dev; 484 struct pdc_module_path module_path; 485 struct pdc_memory_map r_addr; 486 unsigned int func; 487 488 memset(module_path.path.bc, 0xff, 6); 489 module_path.path.mod = mod; 490 dev = legacy_create_device(&r_addr, &module_path); 491 if ((!dev) || (dev->id.hw_type != HPHW_BA)) 492 continue; 493 494 memset(module_path.path.bc, 0xff, 4); 495 module_path.path.bc[4] = mod; 496 497 for (func = 0; func < 16; func++) { 498 module_path.path.bc[5] = 0; 499 module_path.path.mod = func; 500 legacy_create_device(&r_addr, &module_path); 501 } 502 } 503 } 504 505 #else /* CONFIG_PA20 */ 506 #define snake_inventory() do { } while (0) 507 #endif /* CONFIG_PA20 */ 508 509 /* Common 32/64 bit based code goes here */ 510 511 /** 512 * add_system_map_addresses - Add additional addresses to the parisc device. 513 * @dev: The parisc device. 514 * @num_addrs: Then number of addresses to add; 515 * @module_instance: The system_map module instance. 516 * 517 * This function adds any additional addresses reported by the system_map 518 * firmware to the parisc device. 519 */ 520 static void __init 521 add_system_map_addresses(struct parisc_device *dev, int num_addrs, 522 int module_instance) 523 { 524 int i; 525 long status; 526 struct pdc_system_map_addr_info addr_result; 527 528 dev->addr = kmalloc_array(num_addrs, sizeof(*dev->addr), GFP_KERNEL); 529 if(!dev->addr) { 530 printk(KERN_ERR "%s %s(): memory allocation failure\n", 531 __FILE__, __func__); 532 return; 533 } 534 535 for(i = 1; i <= num_addrs; ++i) { 536 status = pdc_system_map_find_addrs(&addr_result, 537 module_instance, i); 538 if(PDC_OK == status) { 539 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr; 540 dev->num_addrs++; 541 } else { 542 printk(KERN_WARNING 543 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n", 544 status, i); 545 } 546 } 547 } 548 549 /** 550 * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP. 551 * 552 * This function attempts to retrieve and register all the devices firmware 553 * knows about via the SYSTEM_MAP PDC call. 554 */ 555 static void __init system_map_inventory(void) 556 { 557 int i; 558 long status = PDC_OK; 559 560 for (i = 0; i < 256; i++) { 561 struct parisc_device *dev; 562 struct pdc_system_map_mod_info module_result; 563 struct pdc_module_path module_path; 564 565 status = pdc_system_map_find_mods(&module_result, 566 &module_path, i); 567 if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD)) 568 break; 569 if (status != PDC_OK) 570 continue; 571 572 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path); 573 if (!dev) 574 continue; 575 576 register_parisc_device(dev); 577 578 /* if available, get the additional addresses for a module */ 579 if (!module_result.add_addrs) 580 continue; 581 582 add_system_map_addresses(dev, module_result.add_addrs, i); 583 } 584 585 walk_central_bus(); 586 return; 587 } 588 589 void __init do_memory_inventory(void) 590 { 591 switch (pdc_type) { 592 593 case PDC_TYPE_PAT: 594 pat_memconfig(); 595 break; 596 597 case PDC_TYPE_SYSTEM_MAP: 598 sprockets_memconfig(); 599 break; 600 601 case PDC_TYPE_SNAKE: 602 pagezero_memconfig(); 603 return; 604 605 default: 606 panic("Unknown PDC type!\n"); 607 } 608 609 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) { 610 printk(KERN_WARNING "Bad memory configuration returned!\n"); 611 printk(KERN_WARNING "Some memory may not be used!\n"); 612 pagezero_memconfig(); 613 } 614 } 615 616 void __init do_device_inventory(void) 617 { 618 printk(KERN_INFO "Searching for devices...\n"); 619 620 init_parisc_bus(); 621 622 switch (pdc_type) { 623 624 case PDC_TYPE_PAT: 625 pat_inventory(); 626 break; 627 628 case PDC_TYPE_SYSTEM_MAP: 629 system_map_inventory(); 630 break; 631 632 case PDC_TYPE_SNAKE: 633 snake_inventory(); 634 break; 635 636 default: 637 panic("Unknown PDC type!\n"); 638 } 639 printk(KERN_INFO "Found devices:\n"); 640 print_parisc_devices(); 641 } 642