arch/parisc/kernel/inventory.c

   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 = PDC_TYPE_ILLEGAL;
  42
  43 void __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 __LP64__
  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 __LP64__
  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
 112 static void __init
 113 set_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 (   ((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
 133 static 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 __LP64__
 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
 170 static int __init
 171 pat_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_NE_MOD;
 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
 276 static 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
 342 static 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 */
 370 static 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   /* !__LP64__ */
 412
 413 #define pat_inventory() do { } while (0)
 414 #define pat_memconfig() do { } while (0)
 415 #define sprockets_memconfig() pagezero_memconfig()
 416
 417 #endif  /* !__LP64__ */
 418
 419
 420 #ifndef CONFIG_PA20
 421
 422 /* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */
 423
 424 static struct parisc_device * __init
 425 legacy_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  */
 450 static 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  */
 491 static void __init
 492 add_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  */
 526 static 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
 560 void __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
 587 void __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 }