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 /* return cell module (PA or Processor view) */ 180 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 181 PA_VIEW, &pa_pdc_cell); 182 183 if (status != PDC_OK) { 184 /* no more cell modules or error */ 185 return status; 186 } 187 188 temp = pa_pdc_cell.cba; 189 dev = alloc_pa_dev(PAT_GET_CBA(temp), &pa_pdc_cell.mod_path); 190 if (!dev) { 191 return PDC_OK; 192 } 193 194 /* alloc_pa_dev sets dev->hpa */ 195 196 /* 197 ** save parameters in the parisc_device 198 ** (The idea being the device driver will call pdc_pat_cell_module() 199 ** and store the results in its own data structure.) 200 */ 201 dev->pcell_loc = pcell_loc; 202 dev->mod_index = mod_index; 203 204 /* save generic info returned from the call */ 205 /* REVISIT: who is the consumer of this? not sure yet... */ 206 dev->mod_info = pa_pdc_cell.mod_info; /* pass to PAT_GET_ENTITY() */ 207 dev->pmod_loc = pa_pdc_cell.mod_location; 208 209 register_parisc_device(dev); /* advertise device */ 210 211#ifdef DEBUG_PAT 212 pdc_pat_cell_mod_maddr_block_t io_pdc_cell; 213 /* dump what we see so far... */ 214 switch (PAT_GET_ENTITY(dev->mod_info)) { 215 unsigned long i; 216 217 case PAT_ENTITY_PROC: 218 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n", 219 pa_pdc_cell.mod[0]); 220 break; 221 222 case PAT_ENTITY_MEM: 223 printk(KERN_DEBUG 224 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n", 225 pa_pdc_cell.mod[0], pa_pdc_cell.mod[1], 226 pa_pdc_cell.mod[2]); 227 break; 228 case PAT_ENTITY_CA: 229 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc); 230 break; 231 232 case PAT_ENTITY_PBC: 233 printk(KERN_DEBUG "PAT_ENTITY_PBC: "); 234 goto print_ranges; 235 236 case PAT_ENTITY_SBA: 237 printk(KERN_DEBUG "PAT_ENTITY_SBA: "); 238 goto print_ranges; 239 240 case PAT_ENTITY_LBA: 241 printk(KERN_DEBUG "PAT_ENTITY_LBA: "); 242 243 print_ranges: 244 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index, 245 IO_VIEW, &io_pdc_cell); 246 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell.mod[1]); 247 for (i = 0; i < pa_pdc_cell.mod[1]; i++) { 248 printk(KERN_DEBUG 249 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 250 i, pa_pdc_cell.mod[2 + i * 3], /* type */ 251 pa_pdc_cell.mod[3 + i * 3], /* start */ 252 pa_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */ 253 printk(KERN_DEBUG 254 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n", 255 i, io_pdc_cell.mod[2 + i * 3], /* type */ 256 io_pdc_cell.mod[3 + i * 3], /* start */ 257 io_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */ 258 } 259 printk(KERN_DEBUG "\n"); 260 break; 261 } 262#endif /* DEBUG_PAT */ 263 return PDC_OK; 264} 265 266 267/* pat pdc can return information about a variety of different 268 * types of memory (e.g. firmware,i/o, etc) but we only care about 269 * the usable physical ram right now. Since the firmware specific 270 * information is allocated on the stack, we'll be generous, in 271 * case there is a lot of other information we don't care about. 272 */ 273 274#define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES) 275 276static void __init pat_memconfig(void) 277{ 278 unsigned long actual_len; 279 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1]; 280 struct pdc_pat_pd_addr_map_entry *mtbl_ptr; 281 physmem_range_t *pmem_ptr; 282 long status; 283 int entries; 284 unsigned long length; 285 int i; 286 287 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry); 288 289 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L); 290 291 if ((status != PDC_OK) 292 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) { 293 294 /* The above pdc call shouldn't fail, but, just in 295 * case, just use the PAGE0 info. 296 */ 297 298 printk("\n\n\n"); 299 printk(KERN_WARNING "WARNING! Could not get full memory configuration. " 300 "All memory may not be used!\n\n\n"); 301 pagezero_memconfig(); 302 return; 303 } 304 305 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry); 306 307 if (entries > PAT_MAX_RANGES) { 308 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 309 printk(KERN_WARNING "Some memory may not be used!\n"); 310 } 311 312 /* Copy information into the firmware independent pmem_ranges 313 * array, skipping types we don't care about. Notice we said 314 * "may" above. We'll use all the entries that were returned. 315 */ 316 317 npmem_ranges = 0; 318 mtbl_ptr = mem_table; 319 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 320 for (i = 0; i < entries; i++,mtbl_ptr++) { 321 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR) 322 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY) 323 || (mtbl_ptr->pages == 0) 324 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL) 325 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI) 326 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) { 327 328 continue; 329 } 330 331 if (npmem_ranges == MAX_PHYSMEM_RANGES) { 332 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 333 printk(KERN_WARNING "Some memory will not be used!\n"); 334 break; 335 } 336 337 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 338 npmem_ranges++; 339 } 340} 341 342static int __init pat_inventory(void) 343{ 344 int status; 345 ulong mod_index = 0; 346 struct pdc_pat_cell_num cell_info; 347 348 /* 349 ** Note: Prelude (and it's successors: Lclass, A400/500) only 350 ** implement PDC_PAT_CELL sub-options 0 and 2. 351 */ 352 status = pdc_pat_cell_get_number(&cell_info); 353 if (status != PDC_OK) { 354 return 0; 355 } 356 357#ifdef DEBUG_PAT 358 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num, 359 cell_info.cell_loc); 360#endif 361 362 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) { 363 mod_index++; 364 } 365 366 return mod_index; 367} 368 369/* We only look for extended memory ranges on a 64 bit capable box */ 370static void __init sprockets_memconfig(void) 371{ 372 struct pdc_memory_table_raddr r_addr; 373 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES]; 374 struct pdc_memory_table *mtbl_ptr; 375 physmem_range_t *pmem_ptr; 376 long status; 377 int entries; 378 int i; 379 380 status = pdc_mem_mem_table(&r_addr,mem_table, 381 (unsigned long)MAX_PHYSMEM_RANGES); 382 383 if (status != PDC_OK) { 384 385 /* The above pdc call only works on boxes with sprockets 386 * firmware (newer B,C,J class). Other non PAT PDC machines 387 * do support more than 3.75 Gb of memory, but we don't 388 * support them yet. 389 */ 390 391 pagezero_memconfig(); 392 return; 393 } 394 395 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) { 396 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n"); 397 printk(KERN_WARNING "Some memory will not be used!\n"); 398 } 399 400 entries = (int)r_addr.entries_returned; 401 402 npmem_ranges = 0; 403 mtbl_ptr = mem_table; 404 pmem_ptr = pmem_ranges; /* Global firmware independent table */ 405 for (i = 0; i < entries; i++,mtbl_ptr++) { 406 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages); 407 npmem_ranges++; 408 } 409} 410 411#else /* !CONFIG_64BIT */ 412 413#define pat_inventory() do { } while (0) 414#define pat_memconfig() do { } while (0) 415#define sprockets_memconfig() pagezero_memconfig() 416 417#endif /* !CONFIG_64BIT */ 418 419 420#ifndef CONFIG_PA20 421 422/* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */ 423 424static struct parisc_device * __init 425legacy_create_device(struct pdc_memory_map *r_addr, 426 struct pdc_module_path *module_path) 427{ 428 struct parisc_device *dev; 429 int status = pdc_mem_map_hpa(r_addr, module_path); 430 if (status != PDC_OK) 431 return NULL; 432 433 dev = alloc_pa_dev(r_addr->hpa, &module_path->path); 434 if (dev == NULL) 435 return NULL; 436 437 register_parisc_device(dev); 438 return dev; 439} 440 441/** 442 * snake_inventory 443 * 444 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used. 445 * To use it, we initialise the mod_path.bc to 0xff and try all values of 446 * mod to get the HPA for the top-level devices. Bus adapters may have 447 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the 448 * module, then trying all possible functions. 449 */ 450static void __init snake_inventory(void) 451{ 452 int mod; 453 for (mod = 0; mod < 16; mod++) { 454 struct parisc_device *dev; 455 struct pdc_module_path module_path; 456 struct pdc_memory_map r_addr; 457 unsigned int func; 458 459 memset(module_path.path.bc, 0xff, 6); 460 module_path.path.mod = mod; 461 dev = legacy_create_device(&r_addr, &module_path); 462 if ((!dev) || (dev->id.hw_type != HPHW_BA)) 463 continue; 464 465 memset(module_path.path.bc, 0xff, 4); 466 module_path.path.bc[4] = mod; 467 468 for (func = 0; func < 16; func++) { 469 module_path.path.bc[5] = 0; 470 module_path.path.mod = func; 471 legacy_create_device(&r_addr, &module_path); 472 } 473 } 474} 475 476#else /* CONFIG_PA20 */ 477#define snake_inventory() do { } while (0) 478#endif /* CONFIG_PA20 */ 479 480/* Common 32/64 bit based code goes here */ 481 482/** 483 * add_system_map_addresses - Add additional addresses to the parisc device. 484 * @dev: The parisc device. 485 * @num_addrs: Then number of addresses to add; 486 * @module_instance: The system_map module instance. 487 * 488 * This function adds any additional addresses reported by the system_map 489 * firmware to the parisc device. 490 */ 491static void __init 492add_system_map_addresses(struct parisc_device *dev, int num_addrs, 493 int module_instance) 494{ 495 int i; 496 long status; 497 struct pdc_system_map_addr_info addr_result; 498 499 dev->addr = kmalloc(num_addrs * sizeof(unsigned long), GFP_KERNEL); 500 if(!dev->addr) { 501 printk(KERN_ERR "%s %s(): memory allocation failure\n", 502 __FILE__, __FUNCTION__); 503 return; 504 } 505 506 for(i = 1; i <= num_addrs; ++i) { 507 status = pdc_system_map_find_addrs(&addr_result, 508 module_instance, i); 509 if(PDC_OK == status) { 510 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr; 511 dev->num_addrs++; 512 } else { 513 printk(KERN_WARNING 514 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n", 515 status, i); 516 } 517 } 518} 519 520/** 521 * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP. 522 * 523 * This function attempts to retrieve and register all the devices firmware 524 * knows about via the SYSTEM_MAP PDC call. 525 */ 526static void __init system_map_inventory(void) 527{ 528 int i; 529 long status = PDC_OK; 530 531 for (i = 0; i < 256; i++) { 532 struct parisc_device *dev; 533 struct pdc_system_map_mod_info module_result; 534 struct pdc_module_path module_path; 535 536 status = pdc_system_map_find_mods(&module_result, 537 &module_path, i); 538 if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD)) 539 break; 540 if (status != PDC_OK) 541 continue; 542 543 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path); 544 if (!dev) 545 continue; 546 547 register_parisc_device(dev); 548 549 /* if available, get the additional addresses for a module */ 550 if (!module_result.add_addrs) 551 continue; 552 553 add_system_map_addresses(dev, module_result.add_addrs, i); 554 } 555 556 walk_central_bus(); 557 return; 558} 559 560void __init do_memory_inventory(void) 561{ 562 switch (pdc_type) { 563 564 case PDC_TYPE_PAT: 565 pat_memconfig(); 566 break; 567 568 case PDC_TYPE_SYSTEM_MAP: 569 sprockets_memconfig(); 570 break; 571 572 case PDC_TYPE_SNAKE: 573 pagezero_memconfig(); 574 return; 575 576 default: 577 panic("Unknown PDC type!\n"); 578 } 579 580 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) { 581 printk(KERN_WARNING "Bad memory configuration returned!\n"); 582 printk(KERN_WARNING "Some memory may not be used!\n"); 583 pagezero_memconfig(); 584 } 585} 586 587void __init do_device_inventory(void) 588{ 589 printk(KERN_INFO "Searching for devices...\n"); 590 591 init_parisc_bus(); 592 593 switch (pdc_type) { 594 595 case PDC_TYPE_PAT: 596 pat_inventory(); 597 break; 598 599 case PDC_TYPE_SYSTEM_MAP: 600 system_map_inventory(); 601 break; 602 603 case PDC_TYPE_SNAKE: 604 snake_inventory(); 605 break; 606 607 default: 608 panic("Unknown PDC type!\n"); 609 } 610 printk(KERN_INFO "Found devices:\n"); 611 print_parisc_devices(); 612} 613