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/udbg.h>
  38
  39 #include "processor_vpd.h"
  40 #include "call_hpt.h"
  41 #include "call_pci.h"
  42 #include "pci.h"
  43 #include "it_exp_vpd_panel.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 static unsigned char __init e2a(unsigned char x)
  84 {
  85         switch (x) {
  86         case 0x81 ... 0x89:
  87                 return x - 0x81 + 'a';
  88         case 0x91 ... 0x99:
  89                 return x - 0x91 + 'j';
  90         case 0xA2 ... 0xA9:
  91                 return x - 0xA2 + 's';
  92         case 0xC1 ... 0xC9:
  93                 return x - 0xC1 + 'A';
  94         case 0xD1 ... 0xD9:
  95                 return x - 0xD1 + 'J';
  96         case 0xE2 ... 0xE9:
  97                 return x - 0xE2 + 'S';
  98         case 0xF0 ... 0xF9:
  99                 return x - 0xF0 + '0';
 100         }
 101         return ' ';
 102 }
 103
 104 static unsigned char * __init strne2a(unsigned char *dest,
 105                 const unsigned char *src, size_t n)
 106 {
 107         int i;
 108
 109         n = strnlen(src, n);
 110
 111         for (i = 0; i < n; i++)
 112                 dest[i] = e2a(src[i]);
 113
 114         return dest;
 115 }
 116
 117 static struct iseries_flat_dt * __init dt_init(void)
 118 {
 119         struct iseries_flat_dt *dt;
 120         unsigned long str_len;
 121
 122         str_len = __dt_strings_end - __dt_strings_start;
 123         dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
 124         dt->header.off_mem_rsvmap =
 125                 offsetof(struct iseries_flat_dt, reserve_map);
 126         dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
 127         dt->header.off_dt_struct = dt->header.off_dt_strings
 128                 + ALIGN(str_len, 8);
 129         dt_data = (void *)((unsigned long)dt + dt->header.off_dt_struct);
 130         dt->header.dt_strings_size = str_len;
 131
 132         /* There is no notion of hardware cpu id on iSeries */
 133         dt->header.boot_cpuid_phys = smp_processor_id();
 134
 135         memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
 136                         str_len);
 137
 138         dt->header.magic = OF_DT_HEADER;
 139         dt->header.version = 0x10;
 140         dt->header.last_comp_version = 0x10;
 141
 142         dt->reserve_map[0] = 0;
 143         dt->reserve_map[1] = 0;
 144
 145         return dt;
 146 }
 147
 148 static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
 149 {
 150         *((u32 *)dt_data) = value;
 151         dt_data += sizeof(u32);
 152 }
 153
 154 #ifdef notyet
 155 static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
 156 {
 157         *((u64 *)dt_data) = value;
 158         dt_data += sizeof(u64);
 159 }
 160 #endif
 161
 162 static void __init dt_push_bytes(struct iseries_flat_dt *dt, const char *data,
 163                 int len)
 164 {
 165         memcpy(dt_data, data, len);
 166         dt_data += ALIGN(len, 4);
 167 }
 168
 169 static void __init dt_start_node(struct iseries_flat_dt *dt, const char *name)
 170 {
 171         dt_push_u32(dt, OF_DT_BEGIN_NODE);
 172         dt_push_bytes(dt, name, strlen(name) + 1);
 173 }
 174
 175 #define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
 176
 177 static void __init dt_prop(struct iseries_flat_dt *dt, const char *name,
 178                 const void *data, int len)
 179 {
 180         unsigned long offset;
 181
 182         dt_push_u32(dt, OF_DT_PROP);
 183
 184         /* Length of the data */
 185         dt_push_u32(dt, len);
 186
 187         offset = name - __dt_strings_start;
 188
 189         /* The offset of the properties name in the string blob. */
 190         dt_push_u32(dt, (u32)offset);
 191
 192         /* The actual data. */
 193         dt_push_bytes(dt, data, len);
 194 }
 195
 196 static void __init dt_prop_str(struct iseries_flat_dt *dt, const char *name,
 197                 const char *data)
 198 {
 199         dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
 200 }
 201
 202 static void __init dt_prop_u32(struct iseries_flat_dt *dt, const char *name,
 203                 u32 data)
 204 {
 205         dt_prop(dt, name, &data, sizeof(u32));
 206 }
 207
 208 #ifdef notyet
 209 static void __init dt_prop_u64(struct iseries_flat_dt *dt, const char *name,
 210                 u64 data)
 211 {
 212         dt_prop(dt, name, &data, sizeof(u64));
 213 }
 214 #endif
 215
 216 static void __init dt_prop_u64_list(struct iseries_flat_dt *dt,
 217                 const char *name, u64 *data, int n)
 218 {
 219         dt_prop(dt, name, data, sizeof(u64) * n);
 220 }
 221
 222 static void __init dt_prop_u32_list(struct iseries_flat_dt *dt,
 223                 const char *name, u32 *data, int n)
 224 {
 225         dt_prop(dt, name, data, sizeof(u32) * n);
 226 }
 227
 228 #ifdef notyet
 229 static void __init dt_prop_empty(struct iseries_flat_dt *dt, const char *name)
 230 {
 231         dt_prop(dt, name, NULL, 0);
 232 }
 233 #endif
 234
 235 static void __init dt_cpus(struct iseries_flat_dt *dt)
 236 {
 237         unsigned char buf[32];
 238         unsigned char *p;
 239         unsigned int i, index;
 240         struct IoHriProcessorVpd *d;
 241         u32 pft_size[2];
 242
 243         /* yuck */
 244         snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
 245         p = strchr(buf, ' ');
 246         if (!p) p = buf + strlen(buf);
 247
 248         dt_start_node(dt, "cpus");
 249         dt_prop_u32(dt, "#address-cells", 1);
 250         dt_prop_u32(dt, "#size-cells", 0);
 251
 252         pft_size[0] = 0; /* NUMA CEC cookie, 0 for non NUMA  */
 253         pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);
 254
 255         for (i = 0; i < NR_CPUS; i++) {
 256                 if (lppaca[i].dyn_proc_status >= 2)
 257                         continue;
 258
 259                 snprintf(p, 32 - (p - buf), "@%d", i);
 260                 dt_start_node(dt, buf);
 261
 262                 dt_prop_str(dt, "device_type", device_type_cpu);
 263
 264                 index = lppaca[i].dyn_hv_phys_proc_index;
 265                 d = &xIoHriProcessorVpd[index];
 266
 267                 dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
 268                 dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);
 269
 270                 dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
 271                 dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);
 272
 273                 /* magic conversions to Hz copied from old code */
 274                 dt_prop_u32(dt, "clock-frequency",
 275                         ((1UL << 34) * 1000000) / d->xProcFreq);
 276                 dt_prop_u32(dt, "timebase-frequency",
 277                         ((1UL << 32) * 1000000) / d->xTimeBaseFreq);
 278
 279                 dt_prop_u32(dt, "reg", i);
 280
 281                 dt_prop_u32_list(dt, "ibm,pft-size", pft_size, 2);
 282
 283                 dt_end_node(dt);
 284         }
 285
 286         dt_end_node(dt);
 287 }
 288
 289 static void __init dt_model(struct iseries_flat_dt *dt)
 290 {
 291         char buf[16] = "IBM,";
 292
 293         /* N.B. lparcfg.c knows about the "IBM," prefixes ... */
 294         /* "IBM," + mfgId[2:3] + systemSerial[1:5] */
 295         strne2a(buf + 4, xItExtVpdPanel.mfgID + 2, 2);
 296         strne2a(buf + 6, xItExtVpdPanel.systemSerial + 1, 5);
 297         buf[11] = '\0';
 298         dt_prop_str(dt, "system-id", buf);
 299
 300         /* "IBM," + machineType[0:4] */
 301         strne2a(buf + 4, xItExtVpdPanel.machineType, 4);
 302         buf[8] = '\0';
 303         dt_prop_str(dt, "model", buf);
 304
 305         dt_prop_str(dt, "compatible", "IBM,iSeries");
 306         dt_prop_u32(dt, "ibm,partition-no", HvLpConfig_getLpIndex());
 307 }
 308
 309 static void __init dt_do_vdevice(struct iseries_flat_dt *dt,
 310                 const char *name, u32 reg, int unit,
 311                 const char *type, const char *compat, int end)
 312 {
 313         char buf[32];
 314
 315         snprintf(buf, 32, "%s@%08x", name, reg + ((unit >= 0) ? unit : 0));
 316         dt_start_node(dt, buf);
 317         dt_prop_str(dt, "device_type", type);
 318         if (compat)
 319                 dt_prop_str(dt, "compatible", compat);
 320         dt_prop_u32(dt, "reg", reg + ((unit >= 0) ? unit : 0));
 321         if (unit >= 0)
 322                 dt_prop_u32(dt, "linux,unit_address", unit);
 323         if (end)
 324                 dt_end_node(dt);
 325 }
 326
 327 static void __init dt_vdevices(struct iseries_flat_dt *dt)
 328 {
 329         u32 reg = 0;
 330         HvLpIndexMap vlan_map;
 331         int i;
 332
 333         dt_start_node(dt, "vdevice");
 334         dt_prop_str(dt, "device_type", device_type_vdevice);
 335         dt_prop_str(dt, "compatible", "IBM,iSeries-vdevice");
 336         dt_prop_u32(dt, "#address-cells", 1);
 337         dt_prop_u32(dt, "#size-cells", 0);
 338
 339         dt_do_vdevice(dt, "vty", reg, -1, device_type_serial,
 340                         "IBM,iSeries-vty", 1);
 341         reg++;
 342
 343         dt_do_vdevice(dt, "v-scsi", reg, -1, device_type_vscsi,
 344                         "IBM,v-scsi", 1);
 345         reg++;
 346
 347         vlan_map = HvLpConfig_getVirtualLanIndexMap();
 348         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
 349                 unsigned char mac_addr[ETH_ALEN];
 350
 351                 if ((vlan_map & (0x8000 >> i)) == 0)
 352                         continue;
 353                 dt_do_vdevice(dt, "l-lan", reg, i, device_type_network,
 354                                 "IBM,iSeries-l-lan", 0);
 355                 mac_addr[0] = 0x02;
 356                 mac_addr[1] = 0x01;
 357                 mac_addr[2] = 0xff;
 358                 mac_addr[3] = i;
 359                 mac_addr[4] = 0xff;
 360                 mac_addr[5] = HvLpConfig_getLpIndex_outline();
 361                 dt_prop(dt, "local-mac-address", (char *)mac_addr, ETH_ALEN);
 362                 dt_prop(dt, "mac-address", (char *)mac_addr, ETH_ALEN);
 363                 dt_prop_u32(dt, "max-frame-size", 9000);
 364                 dt_prop_u32(dt, "address-bits", 48);
 365
 366                 dt_end_node(dt);
 367         }
 368         reg += HVMAXARCHITECTEDVIRTUALLANS;
 369
 370         for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
 371                 dt_do_vdevice(dt, "viodasd", reg, i, device_type_block,
 372                                 "IBM,iSeries-viodasd", 1);
 373         reg += HVMAXARCHITECTEDVIRTUALDISKS;
 374
 375         for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
 376                 dt_do_vdevice(dt, "viocd", reg, i, device_type_block,
 377                                 "IBM,iSeries-viocd", 1);
 378         reg += HVMAXARCHITECTEDVIRTUALCDROMS;
 379
 380         for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
 381                 dt_do_vdevice(dt, "viotape", reg, i, device_type_byte,
 382                                 "IBM,iSeries-viotape", 1);
 383
 384         dt_end_node(dt);
 385 }
 386
 387 struct pci_class_name {
 388         u16 code;
 389         const char *name;
 390         const char *type;
 391 };
 392
 393 static struct pci_class_name __initdata pci_class_name[] = {
 394         { PCI_CLASS_NETWORK_ETHERNET, "ethernet", device_type_network },
 395 };
 396
 397 static struct pci_class_name * __init dt_find_pci_class_name(u16 class_code)
 398 {
 399         struct pci_class_name *cp;
 400
 401         for (cp = pci_class_name;
 402                         cp < &pci_class_name[ARRAY_SIZE(pci_class_name)]; cp++)
 403                 if (cp->code == class_code)
 404                         return cp;
 405         return NULL;
 406 }
 407
 408 /*
 409  * This assumes that the node slot is always on the primary bus!
 410  */
 411 static void __init scan_bridge_slot(struct iseries_flat_dt *dt,
 412                 HvBusNumber bus, struct HvCallPci_BridgeInfo *bridge_info)
 413 {
 414         HvSubBusNumber sub_bus = bridge_info->subBusNumber;
 415         u16 vendor_id;
 416         u16 device_id;
 417         u32 class_id;
 418         int err;
 419         char buf[32];
 420         u32 reg[5];
 421         int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
 422         int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
 423         HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
 424         u8 devfn;
 425         struct pci_class_name *cp;
 426
 427         /*
 428          * Connect all functions of any device found.
 429          */
 430         for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
 431                 for (function = 0; function < 8; function++) {
 432                         HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
 433                                         function);
 434                         err = HvCallXm_connectBusUnit(bus, sub_bus,
 435                                         agent_id, 0);
 436                         if (err) {
 437                                 if (err != 0x302)
 438                                         DBG("connectBusUnit(%x, %x, %x) %x\n",
 439                                                 bus, sub_bus, agent_id, err);
 440                                 continue;
 441                         }
 442
 443                         err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
 444                                         PCI_VENDOR_ID, &vendor_id);
 445                         if (err) {
 446                                 DBG("ReadVendor(%x, %x, %x) %x\n",
 447                                         bus, sub_bus, agent_id, err);
 448                                 continue;
 449                         }
 450                         err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
 451                                         PCI_DEVICE_ID, &device_id);
 452                         if (err) {
 453                                 DBG("ReadDevice(%x, %x, %x) %x\n",
 454                                         bus, sub_bus, agent_id, err);
 455                                 continue;
 456                         }
 457                         err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
 458                                         PCI_CLASS_REVISION , &class_id);
 459                         if (err) {
 460                                 DBG("ReadClass(%x, %x, %x) %x\n",
 461                                         bus, sub_bus, agent_id, err);
 462                                 continue;
 463                         }
 464
 465                         devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
 466                                         function);
 467                         cp = dt_find_pci_class_name(class_id >> 16);
 468                         if (cp && cp->name)
 469                                 strncpy(buf, cp->name, sizeof(buf) - 1);
 470                         else
 471                                 snprintf(buf, sizeof(buf), "pci%x,%x",
 472                                                 vendor_id, device_id);
 473                         buf[sizeof(buf) - 1] = '\0';
 474                         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 475                                         "@%x", PCI_SLOT(devfn));
 476                         buf[sizeof(buf) - 1] = '\0';
 477                         if (function != 0)
 478                                 snprintf(buf + strlen(buf),
 479                                         sizeof(buf) - strlen(buf),
 480                                         ",%x", function);
 481                         dt_start_node(dt, buf);
 482                         reg[0] = (bus << 16) | (devfn << 8);
 483                         reg[1] = 0;
 484                         reg[2] = 0;
 485                         reg[3] = 0;
 486                         reg[4] = 0;
 487                         dt_prop_u32_list(dt, "reg", reg, 5);
 488                         if (cp && (cp->type || cp->name))
 489                                 dt_prop_str(dt, "device_type",
 490                                         cp->type ? cp->type : cp->name);
 491                         dt_prop_u32(dt, "vendor-id", vendor_id);
 492                         dt_prop_u32(dt, "device-id", device_id);
 493                         dt_prop_u32(dt, "class-code", class_id >> 8);
 494                         dt_prop_u32(dt, "revision-id", class_id & 0xff);
 495                         dt_prop_u32(dt, "linux,subbus", sub_bus);
 496                         dt_prop_u32(dt, "linux,agent-id", agent_id);
 497                         dt_prop_u32(dt, "linux,logical-slot-number",
 498                                         bridge_info->logicalSlotNumber);
 499                         dt_end_node(dt);
 500
 501                 }
 502         }
 503 }
 504
 505 static void __init scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
 506                 HvSubBusNumber sub_bus, int id_sel)
 507 {
 508         struct HvCallPci_BridgeInfo bridge_info;
 509         HvAgentId agent_id;
 510         int function;
 511         int ret;
 512
 513         /* Note: hvSubBus and irq is always be 0 at this level! */
 514         for (function = 0; function < 8; ++function) {
 515                 agent_id = ISERIES_PCI_AGENTID(id_sel, function);
 516                 ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
 517                 if (ret != 0) {
 518                         if (ret != 0xb)
 519                                 DBG("connectBusUnit(%x, %x, %x) %x\n",
 520                                                 bus, sub_bus, agent_id, ret);
 521                         continue;
 522                 }
 523                 DBG("found device at bus %d idsel %d func %d (AgentId %x)\n",
 524                                 bus, id_sel, function, agent_id);
 525                 ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
 526                                 iseries_hv_addr(&bridge_info),
 527                                 sizeof(struct HvCallPci_BridgeInfo));
 528                 if (ret != 0)
 529                         continue;
 530                 DBG("bridge info: type %x subbus %x "
 531                         "maxAgents %x maxsubbus %x logslot %x\n",
 532                         bridge_info.busUnitInfo.deviceType,
 533                         bridge_info.subBusNumber,
 534                         bridge_info.maxAgents,
 535                         bridge_info.maxSubBusNumber,
 536                         bridge_info.logicalSlotNumber);
 537                 if (bridge_info.busUnitInfo.deviceType ==
 538                                 HvCallPci_BridgeDevice)
 539                         scan_bridge_slot(dt, bus, &bridge_info);
 540                 else
 541                         DBG("PCI: Invalid Bridge Configuration(0x%02X)",
 542                                 bridge_info.busUnitInfo.deviceType);
 543         }
 544 }
 545
 546 static void __init scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
 547 {
 548         struct HvCallPci_DeviceInfo dev_info;
 549         const HvSubBusNumber sub_bus = 0;       /* EADs is always 0. */
 550         int err;
 551         int id_sel;
 552         const int max_agents = 8;
 553
 554         /*
 555          * Probe for EADs Bridges
 556          */
 557         for (id_sel = 1; id_sel < max_agents; ++id_sel) {
 558                 err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
 559                                 iseries_hv_addr(&dev_info),
 560                                 sizeof(struct HvCallPci_DeviceInfo));
 561                 if (err) {
 562                         if (err != 0x302)
 563                                 DBG("getDeviceInfo(%x, %x, %x) %x\n",
 564                                                 bus, sub_bus, id_sel, err);
 565                         continue;
 566                 }
 567                 if (dev_info.deviceType != HvCallPci_NodeDevice) {
 568                         DBG("PCI: Invalid System Configuration"
 569                                         "(0x%02X) for bus 0x%02x id 0x%02x.\n",
 570                                         dev_info.deviceType, bus, id_sel);
 571                         continue;
 572                 }
 573                 scan_bridge(dt, bus, sub_bus, id_sel);
 574         }
 575 }
 576
 577 static void __init dt_pci_devices(struct iseries_flat_dt *dt)
 578 {
 579         HvBusNumber bus;
 580         char buf[32];
 581         u32 buses[2];
 582         int phb_num = 0;
 583
 584         /* Check all possible buses. */
 585         for (bus = 0; bus < 256; bus++) {
 586                 int err = HvCallXm_testBus(bus);
 587
 588                 if (err) {
 589                         /*
 590                          * Check for Unexpected Return code, a clue that
 591                          * something has gone wrong.
 592                          */
 593                         if (err != 0x0301)
 594                                 DBG("Unexpected Return on Probe(0x%02X) "
 595                                                 "0x%04X\n", bus, err);
 596                         continue;
 597                 }
 598                 DBG("bus %d appears to exist\n", bus);
 599                 snprintf(buf, 32, "pci@%d", phb_num);
 600                 dt_start_node(dt, buf);
 601                 dt_prop_str(dt, "device_type", device_type_pci);
 602                 dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
 603                 dt_prop_u32(dt, "#address-cells", 3);
 604                 dt_prop_u32(dt, "#size-cells", 2);
 605                 buses[0] = buses[1] = bus;
 606                 dt_prop_u32_list(dt, "bus-range", buses, 2);
 607                 scan_phb(dt, bus);
 608                 dt_end_node(dt);
 609                 phb_num++;
 610         }
 611 }
 612
 613 static void dt_finish(struct iseries_flat_dt *dt)
 614 {
 615         dt_push_u32(dt, OF_DT_END);
 616         dt->header.totalsize = (unsigned long)dt_data - (unsigned long)dt;
 617         klimit = ALIGN((unsigned long)dt_data, 8);
 618 }
 619
 620 void * __init build_flat_dt(unsigned long phys_mem_size)
 621 {
 622         struct iseries_flat_dt *iseries_dt;
 623         u64 tmp[2];
 624
 625         iseries_dt = dt_init();
 626
 627         dt_start_node(iseries_dt, "");
 628
 629         dt_prop_u32(iseries_dt, "#address-cells", 2);
 630         dt_prop_u32(iseries_dt, "#size-cells", 2);
 631         dt_model(iseries_dt);
 632
 633         /* /memory */
 634         dt_start_node(iseries_dt, "memory@0");
 635         dt_prop_str(iseries_dt, "device_type", device_type_memory);
 636         tmp[0] = 0;
 637         tmp[1] = phys_mem_size;
 638         dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
 639         dt_end_node(iseries_dt);
 640
 641         /* /chosen */
 642         dt_start_node(iseries_dt, "chosen");
 643         dt_prop_str(iseries_dt, "bootargs", cmd_line);
 644         dt_end_node(iseries_dt);
 645
 646         dt_cpus(iseries_dt);
 647
 648         dt_vdevices(iseries_dt);
 649         dt_pci_devices(iseries_dt);
 650
 651         dt_end_node(iseries_dt);
 652
 653         dt_finish(iseries_dt);
 654
 655         return iseries_dt;
 656 }