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/pdc.h> 29#include <asm/processor.h> 30#include <asm/page.h> 31 32/* 33** Debug options 34** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices. 35*/ 36#undef DEBUG_PAT 37 38int pdc_type = PDC_TYPE_ILLEGAL; 39 40void __init setup_pdc(void) 41{ 42 long status; 43 unsigned int bus_id; 44 struct pdc_system_map_mod_info module_result; 45 struct pdc_module_path module_path; 46 struct pdc_model model; 47#ifdef __LP64__ 48 struct pdc_pat_cell_num cell_info; 49#endif 50 51 /* Determine the pdc "type" used on this machine */ 52 53 printk(KERN_INFO "Determining PDC firmware type: "); 54 55 status = pdc_system_map_find_mods(&module_result, &module_path, 0); 56 if (status == PDC_OK) { 57 pdc_type = PDC_TYPE_SYSTEM_MAP; 58 printk("System Map.\n"); 59 return; 60 } 61 62 /* 63 * If the machine doesn't support PDC_SYSTEM_MAP then either it 64 * is a pdc pat box, or it is an older box. All 64 bit capable 65 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP. 66 */ 67 68 /* 69 * TODO: We should test for 64 bit capability and give a 70 * clearer message. 71 */ 72 73#ifdef __LP64__ 74 status = pdc_pat_cell_get_number(&cell_info); 75 if (status == PDC_OK) { 76 pdc_type = PDC_TYPE_PAT; 77 printk("64 bit PAT.\n"); 78 return; 79 } 80#endif 81 82 /* Check the CPU's bus ID. There's probably a better test. */ 83 84 status = pdc_model_info(&model); 85 86 bus_id = (model.hversion >> (4 + 7)) & 0x1f; 87 88 switch (bus_id) { 89 case 0x4: /* 720, 730, 750, 735, 755 */ 90 case 0x6: /* 705, 710 */ 91 case 0x7: /* 715, 725 */ 92 case 0x8: /* 745, 747, 742 */ 93 case 0xA: /* 712 and similiar */ 94 case 0xC: /* 715/64, at least */ 95 96 pdc_type = PDC_TYPE_SNAKE; 97 printk("Snake.\n"); 98 return; 99 100 default: /* Everything else */ 101 102 printk("Unsupported.\n"); 103 panic("If this is a 64-bit machine, please try a 64-bit kernel.\n"); 104 } 105} 106 107#define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */ 108 109static void __init 110set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start, 111 unsigned long pages4k) 112{ 113 /* Rather than aligning and potentially throwing away 114 * memory, we'll assume that any ranges are already 115 * nicely aligned with any reasonable page size, and 116 * panic if they are not (it's more likely that the 117 * pdc info is bad in this case). 118 */ 119 120 if ( ((start & (PAGE_SIZE - 1)) != 0) 121 || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) ) { 122 123 panic("Memory range doesn't align with page size!\n"); 124 } 125 126 pmem_ptr->start_pfn = (start >> PAGE_SHIFT); 127 pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT); 128} 129 130static void __init pagezero_memconfig(void) 131{ 132 unsigned long npages; 133 134 /* Use the 32 bit information from page zero to create a single 135 * entry in the pmem_ranges[] table. 136 * 137 * We currently don't support machines with contiguous memory 138 * >= 4 Gb, who report that memory using 64 bit only fields 139 * on page zero. It's not worth doing until it can be tested, 140 * and it is not clear we can support those machines for other 141 * reasons. 142 * 143 * If that support is done in the future, this is where it 144 * should be done. 145 */ 146 147 npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT); 148 set_pmem_entry(pmem_ranges,0UL,npages); 149 npmem_ranges = 1; 150} 151 152#ifdef __LP64__ 153 154/* All of the PDC PAT specific code is 64-bit only */ 155 156/* 157** The module object is filled via PDC_PAT_CELL[Return Cell Module]. 158** If a module is found, register module will get the IODC bytes via 159** pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter. 160** 161** The IO view can be used by PDC_PAT_CELL[Return Cell Module] 162** only for SBAs and LBAs. This view will cause an invalid 163** argument error for all other cell module types. 164** 165*/ 166 167static int __init 168pat_query_module(ulong pcell_loc, ulong mod_index) 169{ 170 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell; 171 pdc_pat_cell_mod_maddr_block_t io_pdc_cell; 172 unsigned long bytecnt; 173 unsigned long temp; /* 64-bit scratch value */ 174 long status; /* PDC return value status */ 175 struct parisc_device *dev; 176 177 /* return cell module (PA or Processor view) */ 178 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 179 PA_VIEW, &pa_pdc_cell); 180 181 if (status != PDC_OK) { 182 /* no more cell modules or error */ 183 return status; 184 } 185 186 temp = pa_pdc_cell.cba; 187 dev = alloc_pa_dev(PAT_GET_CBA(temp), &pa_pdc_cell.mod_path); 188 if (!dev) { 189 return PDC_NE_MOD; 190 } 191 192 /* alloc_pa_dev sets dev->hpa */ 193 194 /* 195 ** save parameters in the parisc_device 196 ** (The idea being the device driver will call pdc_pat_cell_module() 197 ** and store the results in its own data structure.) 198 */ 199 dev->pcell_loc = pcell_loc; 200 dev->mod_index = mod_index; 201 202 /* save generic info returned from the call */ 203 /* REVISIT: who is the consumer of this? not sure yet... */ 204 dev->mod_info = pa_pdc_cell.mod_info; /* pass to PAT_GET_ENTITY() */ 205 dev->pmod_loc = pa_pdc_cell.mod_location; 206 207 register_parisc_device(dev); /* advertise device */ 208 209#ifdef DEBUG_PAT 210 /* dump what we see so far... */ 211 switch (PAT_GET_ENTITY(dev->mod_info)) { 212 unsigned long i; 213 214 case PAT_ENTITY_PROC: 215 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n", 216 pa_pdc_cell.mod[0]); 217 break; 218 219 case PAT_ENTITY_MEM: 220 printk(KERN_DEBUG 221 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n", 222 pa_pdc_cell.mod[0], pa_pdc_cell.mod[1], 223 pa_pdc_cell.mod[2]); 224 break; 225 case PAT_ENTITY_CA: 226 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc); 227 break; 228 229 case PAT_ENTITY_PBC: 230 printk(KERN_DEBUG "PAT_ENTITY_PBC: "); 231 goto print_ranges; 232 233 case PAT_ENTITY_SBA: 234 printk(KERN_DEBUG "PAT_ENTITY_SBA: "); 235 goto print_ranges; 236 237 case PAT_ENTITY_LBA: 238 printk(KERN_DEBUG "PAT_ENTITY_LBA: "); 239 240 print_ranges: 241 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 242 IO_VIEW, &io_pdc_cell); 243 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell.mod[1]); 244 for (i = 0; i < pa_pdc_cell.mod[1]; i++) { 245 printk(KERN_DEBUG 246 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 247 i, pa_pdc_cell.mod[2 + i * 3], /* type */ 248 pa_pdc_cell.mod[3 + i * 3], /* start */ 249 pa_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */ 250 printk(KERN_DEBUG 251 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 252 i, io_pdc_cell.mod[2 + i * 3], /* type */ 253 io_pdc_cell.mod[3 + i * 3], /* start */ 254 io_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */ 255 } 256 printk(KERN_DEBUG "\n"); 257 break; 258 } 259#endif /* DEBUG_PAT */ 260 return PDC_OK; 261} 262 263 264/* pat pdc can return information about a variety of different 265 * types of memory (e.g. firmware,i/o, etc) but we only care about 266 * the usable physical ram right now. Since the firmware specific 267 * information is allocated on the stack, we'll be generous, in 268 * case there is a lot of other information we don't care about. 269 */ 270 271#define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES) 272 273static void __init pat_memconfig(void) 274{ 275 unsigned long actual_len; 276 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1]; 277 struct pdc_pat_pd_addr_map_entry *mtbl_ptr; 278 physmem_range_t *pmem_ptr; 279 long status; 280 int entries; 281 unsigned long length; 282 int i; 283 284 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry); 285 286 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L); 287 288 if ((status != PDC_OK) 289 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) { 290 291 /* The above pdc call shouldn't fail, but, just in 292 * case, just use the PAGE0 info. 293 */ 294 295 printk("\n\n\n"); 296 printk(KERN_WARNING "WARNING! Could not get full memory configuration. " 297 "All memory may not be used!\n\n\n"); 298 pagezero_memconfig(); 299 return; 300 } 301 302 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry); 303 304 if (entries > PAT_MAX_RANGES) { 305 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 306 printk(KERN_WARNING "Some memory may not be used!\n"); 307 } 308 309 /* Copy information into the firmware independent pmem_ranges 310 * array, skipping types we don't care about. Notice we said 311 * "may" above. We'll use all the entries that were returned. 312 */ 313 314 npmem_ranges = 0; 315 mtbl_ptr = mem_table; 316 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 317 for (i = 0; i < entries; i++,mtbl_ptr++) { 318 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR) 319 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY) 320 || (mtbl_ptr->pages == 0) 321 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL) 322 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI) 323 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) { 324 325 continue; 326 } 327 328 if (npmem_ranges == MAX_PHYSMEM_RANGES) { 329 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 330 printk(KERN_WARNING "Some memory will not be used!\n"); 331 break; 332 } 333 334 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 335 npmem_ranges++; 336 } 337} 338 339static int __init pat_inventory(void) 340{ 341 int status; 342 ulong mod_index = 0; 343 struct pdc_pat_cell_num cell_info; 344 345 /* 346 ** Note: Prelude (and it's successors: Lclass, A400/500) only 347 ** implement PDC_PAT_CELL sub-options 0 and 2. 348 */ 349 status = pdc_pat_cell_get_number(&cell_info); 350 if (status != PDC_OK) { 351 return 0; 352 } 353 354#ifdef DEBUG_PAT 355 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 356 cell_info.cell_loc); 357#endif 358 359 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) { 360 mod_index++; 361 } 362 363 return mod_index; 364} 365 366/* We only look for extended memory ranges on a 64 bit capable box */ 367static void __init sprockets_memconfig(void) 368{ 369 struct pdc_memory_table_raddr r_addr; 370 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES]; 371 struct pdc_memory_table *mtbl_ptr; 372 physmem_range_t *pmem_ptr; 373 long status; 374 int entries; 375 int i; 376 377 status = pdc_mem_mem_table(&r_addr,mem_table, 378 (unsigned long)MAX_PHYSMEM_RANGES); 379 380 if (status != PDC_OK) { 381 382 /* The above pdc call only works on boxes with sprockets 383 * firmware (newer B,C,J class). Other non PAT PDC machines 384 * do support more than 3.75 Gb of memory, but we don't 385 * support them yet. 386 */ 387 388 pagezero_memconfig(); 389 return; 390 } 391 392 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) { 393 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 394 printk(KERN_WARNING "Some memory will not be used!\n"); 395 } 396 397 entries = (int)r_addr.entries_returned; 398 399 npmem_ranges = 0; 400 mtbl_ptr = mem_table; 401 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 402 for (i = 0; i < entries; i++,mtbl_ptr++) { 403 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 404 npmem_ranges++; 405 } 406} 407 408#else /* !__LP64__ */ 409 410#define pat_inventory() do { } while (0) 411#define pat_memconfig() do { } while (0) 412#define sprockets_memconfig() pagezero_memconfig() 413 414#endif /* !__LP64__ */ 415 416 417#ifndef CONFIG_PA20 418 419/* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */ 420 421static struct parisc_device * __init 422legacy_create_device(struct pdc_memory_map *r_addr, 423 struct pdc_module_path *module_path) 424{ 425 struct parisc_device *dev; 426 int status = pdc_mem_map_hpa(r_addr, module_path); 427 if (status != PDC_OK) 428 return NULL; 429 430 dev = alloc_pa_dev(r_addr->hpa, &module_path->path); 431 if (dev == NULL) 432 return NULL; 433 434 register_parisc_device(dev); 435 return dev; 436} 437 438/** 439 * snake_inventory 440 * 441 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used. 442 * To use it, we initialise the mod_path.bc to 0xff and try all values of 443 * mod to get the HPA for the top-level devices. Bus adapters may have 444 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the 445 * module, then trying all possible functions. 446 */ 447static void __init snake_inventory(void) 448{ 449 int mod; 450 for (mod = 0; mod < 16; mod++) { 451 struct parisc_device *dev; 452 struct pdc_module_path module_path; 453 struct pdc_memory_map r_addr; 454 unsigned int func; 455 456 memset(module_path.path.bc, 0xff, 6); 457 module_path.path.mod = mod; 458 dev = legacy_create_device(&r_addr, &module_path); 459 if ((!dev) || (dev->id.hw_type != HPHW_BA)) 460 continue; 461 462 memset(module_path.path.bc, 0xff, 4); 463 module_path.path.bc[4] = mod; 464 465 for (func = 0; func < 16; func++) { 466 module_path.path.bc[5] = 0; 467 module_path.path.mod = func; 468 legacy_create_device(&r_addr, &module_path); 469 } 470 } 471} 472 473#else /* CONFIG_PA20 */ 474#define snake_inventory() do { } while (0) 475#endif /* CONFIG_PA20 */ 476 477/* Common 32/64 bit based code goes here */ 478 479/** 480 * add_system_map_addresses - Add additional addresses to the parisc device. 481 * @dev: The parisc device. 482 * @num_addrs: Then number of addresses to add; 483 * @module_instance: The system_map module instance. 484 * 485 * This function adds any additional addresses reported by the system_map 486 * firmware to the parisc device. 487 */ 488static void __init 489add_system_map_addresses(struct parisc_device *dev, int num_addrs, 490 int module_instance) 491{ 492 int i; 493 long status; 494 struct pdc_system_map_addr_info addr_result; 495 496 dev->addr = kmalloc(num_addrs * sizeof(unsigned long), GFP_KERNEL); 497 if(!dev->addr) { 498 printk(KERN_ERR "%s %s(): memory allocation failure\n", 499 __FILE__, __FUNCTION__); 500 return; 501 } 502 503 for(i = 1; i <= num_addrs; ++i) { 504 status = pdc_system_map_find_addrs(&addr_result, 505 module_instance, i); 506 if(PDC_OK == status) { 507 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr; 508 dev->num_addrs++; 509 } else { 510 printk(KERN_WARNING 511 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n", 512 status, i); 513 } 514 } 515} 516 517/** 518 * do_system_map_inventory - Retrieve firmware devices via SYSTEM_MAP. 519 * 520 * This function attempts to retrieve and register all the devices firmware 521 * knows about via the SYSTEM_MAP PDC call. 522 */ 523static void __init system_map_inventory(void) 524{ 525 int i; 526 long status = PDC_OK; 527 528 /* 529 * first stop the usb controller, otherwise the machine 530 * might crash during iommu setup 531 */ 532 pdc_suspend_usb(); 533 534 for (i = 0; status != PDC_BAD_PROC && status != PDC_NE_MOD; i++) { 535 struct parisc_device *dev; 536 struct pdc_system_map_mod_info module_result; 537 struct pdc_module_path module_path; 538 539 status = pdc_system_map_find_mods(&module_result, 540 &module_path, i); 541 if (status != PDC_OK) 542 continue; 543 544 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path); 545 if (!dev) 546 continue; 547 548 register_parisc_device(dev); 549 550 /* if available, get the additional addresses for a module */ 551 if (!module_result.add_addrs) 552 continue; 553 554 add_system_map_addresses(dev, module_result.add_addrs, i); 555 } 556 557 walk_central_bus(); 558 return; 559} 560 561void __init do_memory_inventory(void) 562{ 563 switch (pdc_type) { 564 565 case PDC_TYPE_PAT: 566 pat_memconfig(); 567 break; 568 569 case PDC_TYPE_SYSTEM_MAP: 570 sprockets_memconfig(); 571 break; 572 573 case PDC_TYPE_SNAKE: 574 pagezero_memconfig(); 575 return; 576 577 default: 578 panic("Unknown PDC type!\n"); 579 } 580 581 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) { 582 printk(KERN_WARNING "Bad memory configuration returned!\n"); 583 printk(KERN_WARNING "Some memory may not be used!\n"); 584 pagezero_memconfig(); 585 } 586} 587 588void __init do_device_inventory(void) 589{ 590 printk(KERN_INFO "Searching for devices...\n"); 591 592 switch (pdc_type) { 593 594 case PDC_TYPE_PAT: 595 pat_inventory(); 596 break; 597 598 case PDC_TYPE_SYSTEM_MAP: 599 system_map_inventory(); 600 break; 601 602 case PDC_TYPE_SNAKE: 603 snake_inventory(); 604 break; 605 606 default: 607 panic("Unknown PDC type!\n"); 608 } 609 610 printk(KERN_INFO "Found devices:\n"); 611 print_parisc_devices(); 612} 613