arch/powerpc/platforms/iseries/dt.c

   1 /*
   2  *    Copyright (C) 2005-2006 Michael Ellerman, IBM Corporation
   3  *    Copyright (C) 2000-2004, IBM Corporation
   4  *
   5  *    Description:
   6  *      This file contains all the routines to build a flattened device
   7  *      tree for a legacy iSeries machine.
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #undef DEBUG
  16
  17 #include <linux/types.h>
  18 #include <linux/init.h>
  19 #include <linux/pci.h>
  20 #include <linux/pci_regs.h>
  21 #include <linux/pci_ids.h>
  22 #include <linux/threads.h>
  23 #include <linux/bitops.h>
  24 #include <linux/string.h>
  25 #include <linux/kernel.h>
  26 #include <linux/if_ether.h>     /* ETH_ALEN */
  27
  28 #include <asm/machdep.h>
  29 #include <asm/prom.h>
  30 #include <asm/lppaca.h>
  31 #include <asm/cputable.h>
  32 #include <asm/abs_addr.h>
  33 #include <asm/system.h>
  34 #include <asm/iseries/hv_types.h>
  35 #include <asm/iseries/hv_lp_config.h>
  36 #include <asm/iseries/hv_call_xm.h>
  37 #include <asm/iseries/it_exp_vpd_panel.h>
  38 #include <asm/udbg.h>
  39
  40 #include "processor_vpd.h"
  41 #include "call_hpt.h"
  42 #include "call_pci.h"
  43 #include "pci.h"
  44
  45 #ifdef DEBUG
  46 #define DBG(fmt...) udbg_printf(fmt)
  47 #else
  48 #define DBG(fmt...)
  49 #endif
  50
  51 /*
  52  * These are created by the linker script at the start and end
  53  * of the section containing all the strings from this file.
  54  */
  55 extern char __dt_strings_start[];
  56 extern char __dt_strings_end[];
  57
  58 struct iseries_flat_dt {
  59         struct boot_param_header header;
  60         u64 reserve_map[2];
  61 };
  62
  63 static void * __initdata dt_data;
  64
  65 /*
  66  * Putting these strings here keeps them out of the section
  67  * that we rename to .dt_strings using objcopy and capture
  68  * for the strings blob of the flattened device tree.
  69  */
  70 static char __initdata device_type_cpu[] = "cpu";
  71 static char __initdata device_type_memory[] = "memory";
  72 static char __initdata device_type_serial[] = "serial";
  73 static char __initdata device_type_network[] = "network";
  74 static char __initdata device_type_block[] = "block";
  75 static char __initdata device_type_byte[] = "byte";
  76 static char __initdata device_type_pci[] = "pci";
  77 static char __initdata device_type_vdevice[] = "vdevice";
  78 static char __initdata device_type_vscsi[] = "vscsi";
  79
  80
  81 /* EBCDIC to ASCII conversion routines */
  82
  83 unsigned char e2a(unsigned char x)
  84 {
  85         switch (x) {
  86         case 0xF0:
  87                 return '0';
  88         case 0xF1:
  89                 return '1';
  90         case 0xF2:
  91                 return '2';
  92         case 0xF3:
  93                 return '3';
  94         case 0xF4:
  95                 return '4';
  96         case 0xF5:
  97                 return '5';
  98         case 0xF6:
  99                 return '6';
 100         case 0xF7:
 101                 return '7';
 102         case 0xF8:
 103                 return '8';
 104         case 0xF9:
 105                 return '9';
 106         case 0xC1:
 107                 return 'A';
 108         case 0xC2:
 109                 return 'B';
 110         case 0xC3:
 111                 return 'C';
 112         case 0xC4:
 113                 return 'D';
 114         case 0xC5:
 115                 return 'E';
 116         case 0xC6:
 117                 return 'F';
 118         case 0xC7:
 119                 return 'G';
 120         case 0xC8:
 121                 return 'H';
 122         case 0xC9:
 123                 return 'I';
 124         case 0xD1:
 125                 return 'J';
 126         case 0xD2:
 127                 return 'K';
 128         case 0xD3:
 129                 return 'L';
 130         case 0xD4:
 131                 return 'M';
 132         case 0xD5:
 133                 return 'N';
 134         case 0xD6:
 135                 return 'O';
 136         case 0xD7:
 137                 return 'P';
 138         case 0xD8:
 139                 return 'Q';
 140         case 0xD9:
 141                 return 'R';
 142         case 0xE2:
 143                 return 'S';
 144         case 0xE3:
 145                 return 'T';
 146         case 0xE4:
 147                 return 'U';
 148         case 0xE5:
 149                 return 'V';
 150         case 0xE6:
 151                 return 'W';
 152         case 0xE7:
 153                 return 'X';
 154         case 0xE8:
 155                 return 'Y';
 156         case 0xE9:
 157                 return 'Z';
 158         }
 159         return ' ';
 160 }
 161 EXPORT_SYMBOL(e2a);
 162
 163 unsigned char* strne2a(unsigned char *dest, const unsigned char *src, size_t n)
 164 {
 165         int i;
 166
 167         n = strnlen(src, n);
 168
 169         for (i = 0; i < n; i++)
 170                 dest[i] = e2a(src[i]);
 171
 172         return dest;
 173 }
 174
 175 static struct iseries_flat_dt * __init dt_init(void)
 176 {
 177         struct iseries_flat_dt *dt;
 178         unsigned long str_len;
 179
 180         str_len = __dt_strings_end - __dt_strings_start;
 181         dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
 182         dt->header.off_mem_rsvmap =
 183                 offsetof(struct iseries_flat_dt, reserve_map);
 184         dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
 185         dt->header.off_dt_struct = dt->header.off_dt_strings
 186                 + ALIGN(str_len, 8);
 187         dt_data = (void *)((unsigned long)dt + dt->header.off_dt_struct);
 188         dt->header.dt_strings_size = str_len;
 189
 190         /* There is no notion of hardware cpu id on iSeries */
 191         dt->header.boot_cpuid_phys = smp_processor_id();
 192
 193         memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
 194                         str_len);
 195
 196         dt->header.magic = OF_DT_HEADER;
 197         dt->header.version = 0x10;
 198         dt->header.last_comp_version = 0x10;
 199
 200         dt->reserve_map[0] = 0;
 201         dt->reserve_map[1] = 0;
 202
 203         return dt;
 204 }
 205
 206 static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
 207 {
 208         *((u32 *)dt_data) = value;
 209         dt_data += sizeof(u32);
 210 }
 211
 212 #ifdef notyet
 213 static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
 214 {
 215         *((u64 *)dt_data) = value;
 216         dt_data += sizeof(u64);
 217 }
 218 #endif
 219
 220 static void __init dt_push_bytes(struct iseries_flat_dt *dt, const char *data,
 221                 int len)
 222 {
 223         memcpy(dt_data, data, len);
 224         dt_data += ALIGN(len, 4);
 225 }
 226
 227 static void __init dt_start_node(struct iseries_flat_dt *dt, const char *name)
 228 {
 229         dt_push_u32(dt, OF_DT_BEGIN_NODE);
 230         dt_push_bytes(dt, name, strlen(name) + 1);
 231 }
 232
 233 #define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
 234
 235 static void __init dt_prop(struct iseries_flat_dt *dt, const char *name,
 236                 const void *data, int len)
 237 {
 238         unsigned long offset;
 239
 240         dt_push_u32(dt, OF_DT_PROP);
 241
 242         /* Length of the data */
 243         dt_push_u32(dt, len);
 244
 245         offset = name - __dt_strings_start;
 246
 247         /* The offset of the properties name in the string blob. */
 248         dt_push_u32(dt, (u32)offset);
 249
 250         /* The actual data. */
 251         dt_push_bytes(dt, data, len);
 252 }
 253
 254 static void __init dt_prop_str(struct iseries_flat_dt *dt, const char *name,
 255                 const char *data)
 256 {
 257         dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
 258 }
 259
 260 static void __init dt_prop_u32(struct iseries_flat_dt *dt, const char *name,
 261                 u32 data)
 262 {
 263         dt_prop(dt, name, &data, sizeof(u32));
 264 }
 265
 266 #ifdef notyet
 267 static void __init dt_prop_u64(struct iseries_flat_dt *dt, const char *name,
 268                 u64 data)
 269 {
 270         dt_prop(dt, name, &data, sizeof(u64));
 271 }
 272 #endif
 273
 274 static void __init dt_prop_u64_list(struct iseries_flat_dt *dt,
 275                 const char *name, u64 *data, int n)
 276 {
 277         dt_prop(dt, name, data, sizeof(u64) * n);
 278 }
 279
 280 static void __init dt_prop_u32_list(struct iseries_flat_dt *dt,
 281                 const char *name, u32 *data, int n)
 282 {
 283         dt_prop(dt, name, data, sizeof(u32) * n);
 284 }
 285
 286 #ifdef notyet
 287 static void __init dt_prop_empty(struct iseries_flat_dt *dt, const char *name)
 288 {
 289         dt_prop(dt, name, NULL, 0);
 290 }
 291 #endif
 292
 293 static void __init dt_cpus(struct iseries_flat_dt *dt)
 294 {
 295         unsigned char buf[32];
 296         unsigned char *p;
 297         unsigned int i, index;
 298         struct IoHriProcessorVpd *d;
 299         u32 pft_size[2];
 300
 301         /* yuck */
 302         snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
 303         p = strchr(buf, ' ');
 304         if (!p) p = buf + strlen(buf);
 305
 306         dt_start_node(dt, "cpus");
 307         dt_prop_u32(dt, "#address-cells", 1);
 308         dt_prop_u32(dt, "#size-cells", 0);
 309
 310         pft_size[0] = 0; /* NUMA CEC cookie, 0 for non NUMA  */
 311         pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);
 312
 313         for (i = 0; i < NR_CPUS; i++) {
 314                 if (lppaca[i].dyn_proc_status >= 2)
 315                         continue;
 316
 317                 snprintf(p, 32 - (p - buf), "@%d", i);
 318                 dt_start_node(dt, buf);
 319
 320                 dt_prop_str(dt, "device_type", device_type_cpu);
 321
 322                 index = lppaca[i].dyn_hv_phys_proc_index;
 323                 d = &xIoHriProcessorVpd[index];
 324
 325                 dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
 326                 dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);
 327
 328                 dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
 329                 dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);
 330
 331                 /* magic conversions to Hz copied from old code */
 332                 dt_prop_u32(dt, "clock-frequency",
 333                         ((1UL << 34) * 1000000) / d->xProcFreq);
 334                 dt_prop_u32(dt, "timebase-frequency",
 335                         ((1UL << 32) * 1000000) / d->xTimeBaseFreq);
 336
 337                 dt_prop_u32(dt, "reg", i);
 338
 339                 dt_prop_u32_list(dt, "ibm,pft-size", pft_size, 2);
 340
 341                 dt_end_node(dt);
 342         }
 343
 344         dt_end_node(dt);
 345 }
 346
 347 static void __init dt_model(struct iseries_flat_dt *dt)
 348 {
 349         char buf[16] = "IBM,";
 350
 351         /* N.B. lparcfg.c knows about the "IBM," prefixes ... */
 352         /* "IBM," + mfgId[2:3] + systemSerial[1:5] */
 353         strne2a(buf + 4, xItExtVpdPanel.mfgID + 2, 2);
 354         strne2a(buf + 6, xItExtVpdPanel.systemSerial + 1, 5);
 355         buf[11] = '\0';
 356         dt_prop_str(dt, "system-id", buf);
 357
 358         /* "IBM," + machineType[0:4] */
 359         strne2a(buf + 4, xItExtVpdPanel.machineType, 4);
 360         buf[8] = '\0';
 361         dt_prop_str(dt, "model", buf);
 362
 363         dt_prop_str(dt, "compatible", "IBM,iSeries");
 364         dt_prop_u32(dt, "ibm,partition-no", HvLpConfig_getLpIndex());
 365 }
 366
 367 static void __init dt_do_vdevice(struct iseries_flat_dt *dt,
 368                 const char *name, u32 reg, int unit,
 369                 const char *type, const char *compat, int end)
 370 {
 371         char buf[32];
 372
 373         snprintf(buf, 32, "%s@%08x", name, reg + ((unit >= 0) ? unit : 0));
 374         dt_start_node(dt, buf);
 375         dt_prop_str(dt, "device_type", type);
 376         if (compat)
 377                 dt_prop_str(dt, "compatible", compat);
 378         dt_prop_u32(dt, "reg", reg + ((unit >= 0) ? unit : 0));
 379         if (unit >= 0)
 380                 dt_prop_u32(dt, "linux,unit_address", unit);
 381         if (end)
 382                 dt_end_node(dt);
 383 }
 384
 385 static void __init dt_vdevices(struct iseries_flat_dt *dt)
 386 {
 387         u32 reg = 0;
 388         HvLpIndexMap vlan_map;
 389         int i;
 390
 391         dt_start_node(dt, "vdevice");
 392         dt_prop_str(dt, "device_type", device_type_vdevice);
 393         dt_prop_str(dt, "compatible", "IBM,iSeries-vdevice");
 394         dt_prop_u32(dt, "#address-cells", 1);
 395         dt_prop_u32(dt, "#size-cells", 0);
 396
 397         dt_do_vdevice(dt, "vty", reg, -1, device_type_serial, NULL, 1);
 398         reg++;
 399
 400         dt_do_vdevice(dt, "v-scsi", reg, -1, device_type_vscsi,
 401                         "IBM,v-scsi", 1);
 402         reg++;
 403
 404         vlan_map = HvLpConfig_getVirtualLanIndexMap();
 405         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
 406                 unsigned char mac_addr[ETH_ALEN];
 407
 408                 if ((vlan_map & (0x8000 >> i)) == 0)
 409                         continue;
 410                 dt_do_vdevice(dt, "l-lan", reg, i, device_type_network,
 411                                 "IBM,iSeries-l-lan", 0);
 412                 mac_addr[0] = 0x02;
 413                 mac_addr[1] = 0x01;
 414                 mac_addr[2] = 0xff;
 415                 mac_addr[3] = i;
 416                 mac_addr[4] = 0xff;
 417                 mac_addr[5] = HvLpConfig_getLpIndex_outline();
 418                 dt_prop(dt, "local-mac-address", (char *)mac_addr, ETH_ALEN);
 419                 dt_prop(dt, "mac-address", (char *)mac_addr, ETH_ALEN);
 420                 dt_prop_u32(dt, "max-frame-size", 9000);
 421                 dt_prop_u32(dt, "address-bits", 48);
 422
 423                 dt_end_node(dt);
 424         }
 425         reg += HVMAXARCHITECTEDVIRTUALLANS;
 426
 427         for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
 428                 dt_do_vdevice(dt, "viodasd", reg, i, device_type_block,
 429                                 "IBM,iSeries-viodasd", 1);
 430         reg += HVMAXARCHITECTEDVIRTUALDISKS;
 431
 432         for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
 433                 dt_do_vdevice(dt, "viocd", reg, i, device_type_block,
 434                                 "IBM,iSeries-viocd", 1);
 435         reg += HVMAXARCHITECTEDVIRTUALCDROMS;
 436
 437         for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
 438                 dt_do_vdevice(dt, "viotape", reg, i, device_type_byte,
 439                                 "IBM,iSeries-viotape", 1);
 440
 441         dt_end_node(dt);
 442 }
 443
 444 struct pci_class_name {
 445         u16 code;
 446         const char *name;
 447         const char *type;
 448 };
 449
 450 static struct pci_class_name __initdata pci_class_name[] = {
 451         { PCI_CLASS_NETWORK_ETHERNET, "ethernet", device_type_network },
 452 };
 453
 454 static struct pci_class_name * __init dt_find_pci_class_name(u16 class_code)
 455 {
 456         struct pci_class_name *cp;
 457
 458         for (cp = pci_class_name;
 459                         cp < &pci_class_name[ARRAY_SIZE(pci_class_name)]; cp++)
 460                 if (cp->code == class_code)
 461                         return cp;
 462         return NULL;
 463 }
 464
 465 /*
 466  * This assumes that the node slot is always on the primary bus!
 467  */
 468 static void __init scan_bridge_slot(struct iseries_flat_dt *dt,
 469                 HvBusNumber bus, struct HvCallPci_BridgeInfo *bridge_info)
 470 {
 471         HvSubBusNumber sub_bus = bridge_info->subBusNumber;
 472         u16 vendor_id;
 473         u16 device_id;
 474         u32 class_id;
 475         int err;
 476         char buf[32];
 477         u32 reg[5];
 478         int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
 479         int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
 480         HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
 481         u8 devfn;
 482         struct pci_class_name *cp;
 483
 484         /*
 485          * Connect all functions of any device found.
 486          */
 487         for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
 488                 for (function = 0; function < 8; function++) {
 489                         HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
 490                                         function);
 491                         err = HvCallXm_connectBusUnit(bus, sub_bus,
 492                                         agent_id, 0);
 493                         if (err) {
 494                                 if (err != 0x302)
 495                                         DBG("connectBusUnit(%x, %x, %x) %x\n",
 496                                                 bus, sub_bus, agent_id, err);
 497                                 continue;
 498                         }
 499
 500                         err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
 501                                         PCI_VENDOR_ID, &vendor_id);
 502                         if (err) {
 503                                 DBG("ReadVendor(%x, %x, %x) %x\n",
 504                                         bus, sub_bus, agent_id, err);
 505                                 continue;
 506                         }
 507                         err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
 508                                         PCI_DEVICE_ID, &device_id);
 509                         if (err) {
 510                                 DBG("ReadDevice(%x, %x, %x) %x\n",
 511                                         bus, sub_bus, agent_id, err);
 512                                 continue;
 513                         }
 514                         err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
 515                                         PCI_CLASS_REVISION , &class_id);
 516                         if (err) {
 517                                 DBG("ReadClass(%x, %x, %x) %x\n",
 518                                         bus, sub_bus, agent_id, err);
 519                                 continue;
 520                         }
 521
 522                         devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
 523                                         function);
 524                         cp = dt_find_pci_class_name(class_id >> 16);
 525                         if (cp && cp->name)
 526                                 strncpy(buf, cp->name, sizeof(buf) - 1);
 527                         else
 528                                 snprintf(buf, sizeof(buf), "pci%x,%x",
 529                                                 vendor_id, device_id);
 530                         buf[sizeof(buf) - 1] = '\0';
 531                         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 532                                         "@%x", PCI_SLOT(devfn));
 533                         buf[sizeof(buf) - 1] = '\0';
 534                         if (function != 0)
 535                                 snprintf(buf + strlen(buf),
 536                                         sizeof(buf) - strlen(buf),
 537                                         ",%x", function);
 538                         dt_start_node(dt, buf);
 539                         reg[0] = (bus << 16) | (devfn << 8);
 540                         reg[1] = 0;
 541                         reg[2] = 0;
 542                         reg[3] = 0;
 543                         reg[4] = 0;
 544                         dt_prop_u32_list(dt, "reg", reg, 5);
 545                         if (cp && (cp->type || cp->name))
 546                                 dt_prop_str(dt, "device_type",
 547                                         cp->type ? cp->type : cp->name);
 548                         dt_prop_u32(dt, "vendor-id", vendor_id);
 549                         dt_prop_u32(dt, "device-id", device_id);
 550                         dt_prop_u32(dt, "class-code", class_id >> 8);
 551                         dt_prop_u32(dt, "revision-id", class_id & 0xff);
 552                         dt_prop_u32(dt, "linux,subbus", sub_bus);
 553                         dt_prop_u32(dt, "linux,agent-id", agent_id);
 554                         dt_prop_u32(dt, "linux,logical-slot-number",
 555                                         bridge_info->logicalSlotNumber);
 556                         dt_end_node(dt);
 557
 558                 }
 559         }
 560 }
 561
 562 static void __init scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
 563                 HvSubBusNumber sub_bus, int id_sel)
 564 {
 565         struct HvCallPci_BridgeInfo bridge_info;
 566         HvAgentId agent_id;
 567         int function;
 568         int ret;
 569
 570         /* Note: hvSubBus and irq is always be 0 at this level! */
 571         for (function = 0; function < 8; ++function) {
 572                 agent_id = ISERIES_PCI_AGENTID(id_sel, function);
 573                 ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
 574                 if (ret != 0) {
 575                         if (ret != 0xb)
 576                                 DBG("connectBusUnit(%x, %x, %x) %x\n",
 577                                                 bus, sub_bus, agent_id, ret);
 578                         continue;
 579                 }
 580                 DBG("found device at bus %d idsel %d func %d (AgentId %x)\n",
 581                                 bus, id_sel, function, agent_id);
 582                 ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
 583                                 iseries_hv_addr(&bridge_info),
 584                                 sizeof(struct HvCallPci_BridgeInfo));
 585                 if (ret != 0)
 586                         continue;
 587                 DBG("bridge info: type %x subbus %x "
 588                         "maxAgents %x maxsubbus %x logslot %x\n",
 589                         bridge_info.busUnitInfo.deviceType,
 590                         bridge_info.subBusNumber,
 591                         bridge_info.maxAgents,
 592                         bridge_info.maxSubBusNumber,
 593                         bridge_info.logicalSlotNumber);
 594                 if (bridge_info.busUnitInfo.deviceType ==
 595                                 HvCallPci_BridgeDevice)
 596                         scan_bridge_slot(dt, bus, &bridge_info);
 597                 else
 598                         DBG("PCI: Invalid Bridge Configuration(0x%02X)",
 599                                 bridge_info.busUnitInfo.deviceType);
 600         }
 601 }
 602
 603 static void __init scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
 604 {
 605         struct HvCallPci_DeviceInfo dev_info;
 606         const HvSubBusNumber sub_bus = 0;       /* EADs is always 0. */
 607         int err;
 608         int id_sel;
 609         const int max_agents = 8;
 610
 611         /*
 612          * Probe for EADs Bridges
 613          */
 614         for (id_sel = 1; id_sel < max_agents; ++id_sel) {
 615                 err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
 616                                 iseries_hv_addr(&dev_info),
 617                                 sizeof(struct HvCallPci_DeviceInfo));
 618                 if (err) {
 619                         if (err != 0x302)
 620                                 DBG("getDeviceInfo(%x, %x, %x) %x\n",
 621                                                 bus, sub_bus, id_sel, err);
 622                         continue;
 623                 }
 624                 if (dev_info.deviceType != HvCallPci_NodeDevice) {
 625                         DBG("PCI: Invalid System Configuration"
 626                                         "(0x%02X) for bus 0x%02x id 0x%02x.\n",
 627                                         dev_info.deviceType, bus, id_sel);
 628                         continue;
 629                 }
 630                 scan_bridge(dt, bus, sub_bus, id_sel);
 631         }
 632 }
 633
 634 static void __init dt_pci_devices(struct iseries_flat_dt *dt)
 635 {
 636         HvBusNumber bus;
 637         char buf[32];
 638         u32 buses[2];
 639         int phb_num = 0;
 640
 641         /* Check all possible buses. */
 642         for (bus = 0; bus < 256; bus++) {
 643                 int err = HvCallXm_testBus(bus);
 644
 645                 if (err) {
 646                         /*
 647                          * Check for Unexpected Return code, a clue that
 648                          * something has gone wrong.
 649                          */
 650                         if (err != 0x0301)
 651                                 DBG("Unexpected Return on Probe(0x%02X) "
 652                                                 "0x%04X\n", bus, err);
 653                         continue;
 654                 }
 655                 DBG("bus %d appears to exist\n", bus);
 656                 snprintf(buf, 32, "pci@%d", phb_num);
 657                 dt_start_node(dt, buf);
 658                 dt_prop_str(dt, "device_type", device_type_pci);
 659                 dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
 660                 dt_prop_u32(dt, "#address-cells", 3);
 661                 dt_prop_u32(dt, "#size-cells", 2);
 662                 buses[0] = buses[1] = bus;
 663                 dt_prop_u32_list(dt, "bus-range", buses, 2);
 664                 scan_phb(dt, bus);
 665                 dt_end_node(dt);
 666                 phb_num++;
 667         }
 668 }
 669
 670 static void dt_finish(struct iseries_flat_dt *dt)
 671 {
 672         dt_push_u32(dt, OF_DT_END);
 673         dt->header.totalsize = (unsigned long)dt_data - (unsigned long)dt;
 674         klimit = ALIGN((unsigned long)dt_data, 8);
 675 }
 676
 677 void * __init build_flat_dt(unsigned long phys_mem_size)
 678 {
 679         struct iseries_flat_dt *iseries_dt;
 680         u64 tmp[2];
 681
 682         iseries_dt = dt_init();
 683
 684         dt_start_node(iseries_dt, "");
 685
 686         dt_prop_u32(iseries_dt, "#address-cells", 2);
 687         dt_prop_u32(iseries_dt, "#size-cells", 2);
 688         dt_model(iseries_dt);
 689
 690         /* /memory */
 691         dt_start_node(iseries_dt, "memory@0");
 692         dt_prop_str(iseries_dt, "device_type", device_type_memory);
 693         tmp[0] = 0;
 694         tmp[1] = phys_mem_size;
 695         dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
 696         dt_end_node(iseries_dt);
 697
 698         /* /chosen */
 699         dt_start_node(iseries_dt, "chosen");
 700         dt_prop_str(iseries_dt, "bootargs", cmd_line);
 701         dt_end_node(iseries_dt);
 702
 703         dt_cpus(iseries_dt);
 704
 705         dt_vdevices(iseries_dt);
 706         dt_pci_devices(iseries_dt);
 707
 708         dt_end_node(iseries_dt);
 709
 710         dt_finish(iseries_dt);
 711
 712         return iseries_dt;
 713 }