linux/arch/parisc/kernel/inventory.c
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   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