arch/powerpc/platforms/iseries/dt.c

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