arch/powerpc/platforms/iseries/setup.c

   1 /*
   2  *    Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
   3  *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
   4  *
   5  *    Description:
   6  *      Architecture- / platform-specific boot-time initialization code for
   7  *      the IBM iSeries LPAR.  Adapted from original code by Grant Erickson and
   8  *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
   9  *      <dan@net4x.com>.
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #undef DEBUG
  18
  19 #include <linux/init.h>
  20 #include <linux/threads.h>
  21 #include <linux/smp.h>
  22 #include <linux/param.h>
  23 #include <linux/string.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/kdev_t.h>
  26 #include <linux/major.h>
  27 #include <linux/root_dev.h>
  28 #include <linux/kernel.h>
  29
  30 #include <asm/processor.h>
  31 #include <asm/machdep.h>
  32 #include <asm/page.h>
  33 #include <asm/mmu.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/cputable.h>
  37 #include <asm/sections.h>
  38 #include <asm/iommu.h>
  39 #include <asm/firmware.h>
  40 #include <asm/system.h>
  41 #include <asm/time.h>
  42 #include <asm/paca.h>
  43 #include <asm/cache.h>
  44 #include <asm/sections.h>
  45 #include <asm/abs_addr.h>
  46 #include <asm/iseries/hv_lp_config.h>
  47 #include <asm/iseries/hv_call_event.h>
  48 #include <asm/iseries/hv_call_xm.h>
  49 #include <asm/iseries/it_lp_queue.h>
  50 #include <asm/iseries/mf.h>
  51 #include <asm/iseries/hv_lp_event.h>
  52 #include <asm/iseries/lpar_map.h>
  53 #include <asm/udbg.h>
  54 #include <asm/irq.h>
  55
  56 #include "naca.h"
  57 #include "setup.h"
  58 #include "irq.h"
  59 #include "vpd_areas.h"
  60 #include "processor_vpd.h"
  61 #include "it_lp_naca.h"
  62 #include "main_store.h"
  63 #include "call_sm.h"
  64 #include "call_hpt.h"
  65
  66 #ifdef DEBUG
  67 #define DBG(fmt...) udbg_printf(fmt)
  68 #else
  69 #define DBG(fmt...)
  70 #endif
  71
  72 /* Function Prototypes */
  73 static unsigned long build_iSeries_Memory_Map(void);
  74 static void iseries_shared_idle(void);
  75 static void iseries_dedicated_idle(void);
  76 #ifdef CONFIG_PCI
  77 extern void iSeries_pci_final_fixup(void);
  78 #else
  79 static void iSeries_pci_final_fixup(void) { }
  80 #endif
  81
  82
  83 struct MemoryBlock {
  84         unsigned long absStart;
  85         unsigned long absEnd;
  86         unsigned long logicalStart;
  87         unsigned long logicalEnd;
  88 };
  89
  90 /*
  91  * Process the main store vpd to determine where the holes in memory are
  92  * and return the number of physical blocks and fill in the array of
  93  * block data.
  94  */
  95 static unsigned long iSeries_process_Condor_mainstore_vpd(
  96                 struct MemoryBlock *mb_array, unsigned long max_entries)
  97 {
  98         unsigned long holeFirstChunk, holeSizeChunks;
  99         unsigned long numMemoryBlocks = 1;
 100         struct IoHriMainStoreSegment4 *msVpd =
 101                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 102         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 103         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 104         unsigned long holeSize = holeEnd - holeStart;
 105
 106         printk("Mainstore_VPD: Condor\n");
 107         /*
 108          * Determine if absolute memory has any
 109          * holes so that we can interpret the
 110          * access map we get back from the hypervisor
 111          * correctly.
 112          */
 113         mb_array[0].logicalStart = 0;
 114         mb_array[0].logicalEnd = 0x100000000;
 115         mb_array[0].absStart = 0;
 116         mb_array[0].absEnd = 0x100000000;
 117
 118         if (holeSize) {
 119                 numMemoryBlocks = 2;
 120                 holeStart = holeStart & 0x000fffffffffffff;
 121                 holeStart = addr_to_chunk(holeStart);
 122                 holeFirstChunk = holeStart;
 123                 holeSize = addr_to_chunk(holeSize);
 124                 holeSizeChunks = holeSize;
 125                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 126                                 holeFirstChunk, holeSizeChunks );
 127                 mb_array[0].logicalEnd = holeFirstChunk;
 128                 mb_array[0].absEnd = holeFirstChunk;
 129                 mb_array[1].logicalStart = holeFirstChunk;
 130                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 131                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 132                 mb_array[1].absEnd = 0x100000000;
 133         }
 134         return numMemoryBlocks;
 135 }
 136
 137 #define MaxSegmentAreas                 32
 138 #define MaxSegmentAdrRangeBlocks        128
 139 #define MaxAreaRangeBlocks              4
 140
 141 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 142                 struct MemoryBlock *mb_array, unsigned long max_entries)
 143 {
 144         struct IoHriMainStoreSegment5 *msVpdP =
 145                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 146         unsigned long numSegmentBlocks = 0;
 147         u32 existsBits = msVpdP->msAreaExists;
 148         unsigned long area_num;
 149
 150         printk("Mainstore_VPD: Regatta\n");
 151
 152         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 153                 unsigned long numAreaBlocks;
 154                 struct IoHriMainStoreArea4 *currentArea;
 155
 156                 if (existsBits & 0x80000000) {
 157                         unsigned long block_num;
 158
 159                         currentArea = &msVpdP->msAreaArray[area_num];
 160                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 161                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 162                                         area_num, numAreaBlocks);
 163                         for (block_num = 0; block_num < numAreaBlocks;
 164                                         ++block_num ) {
 165                                 /* Process an address range block */
 166                                 struct MemoryBlock tempBlock;
 167                                 unsigned long i;
 168
 169                                 tempBlock.absStart =
 170                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 171                                 tempBlock.absEnd =
 172                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 173                                 tempBlock.logicalStart = 0;
 174                                 tempBlock.logicalEnd   = 0;
 175                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 176                                                 block_num, tempBlock.absStart,
 177                                                 tempBlock.absEnd);
 178
 179                                 for (i = 0; i < numSegmentBlocks; ++i) {
 180                                         if (mb_array[i].absStart ==
 181                                                         tempBlock.absStart)
 182                                                 break;
 183                                 }
 184                                 if (i == numSegmentBlocks) {
 185                                         if (numSegmentBlocks == max_entries)
 186                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 187                                         mb_array[numSegmentBlocks] = tempBlock;
 188                                         ++numSegmentBlocks;
 189                                 } else
 190                                         printk(" (duplicate)");
 191                         }
 192                         printk("\n");
 193                 }
 194                 existsBits <<= 1;
 195         }
 196         /* Now sort the blocks found into ascending sequence */
 197         if (numSegmentBlocks > 1) {
 198                 unsigned long m, n;
 199
 200                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 201                         for (n = numSegmentBlocks - 1; m < n; --n) {
 202                                 if (mb_array[n].absStart <
 203                                                 mb_array[n-1].absStart) {
 204                                         struct MemoryBlock tempBlock;
 205
 206                                         tempBlock = mb_array[n];
 207                                         mb_array[n] = mb_array[n-1];
 208                                         mb_array[n-1] = tempBlock;
 209                                 }
 210                         }
 211                 }
 212         }
 213         /*
 214          * Assign "logical" addresses to each block.  These
 215          * addresses correspond to the hypervisor "bitmap" space.
 216          * Convert all addresses into units of 256K chunks.
 217          */
 218         {
 219         unsigned long i, nextBitmapAddress;
 220
 221         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 222         nextBitmapAddress = 0;
 223         for (i = 0; i < numSegmentBlocks; ++i) {
 224                 unsigned long length = mb_array[i].absEnd -
 225                         mb_array[i].absStart;
 226
 227                 mb_array[i].logicalStart = nextBitmapAddress;
 228                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 229                 nextBitmapAddress += length;
 230                 printk("          Bitmap range: %016lx - %016lx\n"
 231                                 "        Absolute range: %016lx - %016lx\n",
 232                                 mb_array[i].logicalStart,
 233                                 mb_array[i].logicalEnd,
 234                                 mb_array[i].absStart, mb_array[i].absEnd);
 235                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 236                                 0x000fffffffffffff);
 237                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 238                                 0x000fffffffffffff);
 239                 mb_array[i].logicalStart =
 240                         addr_to_chunk(mb_array[i].logicalStart);
 241                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 242         }
 243         }
 244
 245         return numSegmentBlocks;
 246 }
 247
 248 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 249                 unsigned long max_entries)
 250 {
 251         unsigned long i;
 252         unsigned long mem_blocks = 0;
 253
 254         if (cpu_has_feature(CPU_FTR_SLB))
 255                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 256                                 max_entries);
 257         else
 258                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 259                                 max_entries);
 260
 261         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 262         for (i = 0; i < mem_blocks; ++i) {
 263                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 264                        "                             abs chunks %016lx - %016lx\n",
 265                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 266                         mb_array[i].absStart, mb_array[i].absEnd);
 267         }
 268         return mem_blocks;
 269 }
 270
 271 static void __init iSeries_get_cmdline(void)
 272 {
 273         char *p, *q;
 274
 275         /* copy the command line parameter from the primary VSP  */
 276         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 277                         HvLpDma_Direction_RemoteToLocal);
 278
 279         p = cmd_line;
 280         q = cmd_line + 255;
 281         while(p < q) {
 282                 if (!*p || *p == '\n')
 283                         break;
 284                 ++p;
 285         }
 286         *p = 0;
 287 }
 288
 289 static void __init iSeries_init_early(void)
 290 {
 291         DBG(" -> iSeries_init_early()\n");
 292
 293         /* Snapshot the timebase, for use in later recalibration */
 294         iSeries_time_init_early();
 295
 296         /*
 297          * Initialize the DMA/TCE management
 298          */
 299         iommu_init_early_iSeries();
 300
 301         /* Initialize machine-dependency vectors */
 302 #ifdef CONFIG_SMP
 303         smp_init_iSeries();
 304 #endif
 305
 306         /* Associate Lp Event Queue 0 with processor 0 */
 307         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 308
 309         mf_init();
 310
 311         DBG(" <- iSeries_init_early()\n");
 312 }
 313
 314 struct mschunks_map mschunks_map = {
 315         /* XXX We don't use these, but Piranha might need them. */
 316         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 317         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 318         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 319 };
 320 EXPORT_SYMBOL(mschunks_map);
 321
 322 void mschunks_alloc(unsigned long num_chunks)
 323 {
 324         klimit = _ALIGN(klimit, sizeof(u32));
 325         mschunks_map.mapping = (u32 *)klimit;
 326         klimit += num_chunks * sizeof(u32);
 327         mschunks_map.num_chunks = num_chunks;
 328 }
 329
 330 /*
 331  * The iSeries may have very large memories ( > 128 GB ) and a partition
 332  * may get memory in "chunks" that may be anywhere in the 2**52 real
 333  * address space.  The chunks are 256K in size.  To map this to the
 334  * memory model Linux expects, the AS/400 specific code builds a
 335  * translation table to translate what Linux thinks are "physical"
 336  * addresses to the actual real addresses.  This allows us to make
 337  * it appear to Linux that we have contiguous memory starting at
 338  * physical address zero while in fact this could be far from the truth.
 339  * To avoid confusion, I'll let the words physical and/or real address
 340  * apply to the Linux addresses while I'll use "absolute address" to
 341  * refer to the actual hardware real address.
 342  *
 343  * build_iSeries_Memory_Map gets information from the Hypervisor and
 344  * looks at the Main Store VPD to determine the absolute addresses
 345  * of the memory that has been assigned to our partition and builds
 346  * a table used to translate Linux's physical addresses to these
 347  * absolute addresses.  Absolute addresses are needed when
 348  * communicating with the hypervisor (e.g. to build HPT entries)
 349  *
 350  * Returns the physical memory size
 351  */
 352
 353 static unsigned long __init build_iSeries_Memory_Map(void)
 354 {
 355         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 356         u32 nextPhysChunk;
 357         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 358         u32 totalChunks,moreChunks;
 359         u32 currChunk, thisChunk, absChunk;
 360         u32 currDword;
 361         u32 chunkBit;
 362         u64 map;
 363         struct MemoryBlock mb[32];
 364         unsigned long numMemoryBlocks, curBlock;
 365
 366         /* Chunk size on iSeries is 256K bytes */
 367         totalChunks = (u32)HvLpConfig_getMsChunks();
 368         mschunks_alloc(totalChunks);
 369
 370         /*
 371          * Get absolute address of our load area
 372          * and map it to physical address 0
 373          * This guarantees that the loadarea ends up at physical 0
 374          * otherwise, it might not be returned by PLIC as the first
 375          * chunks
 376          */
 377
 378         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 379         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 380
 381         /*
 382          * Only add the pages already mapped here.
 383          * Otherwise we might add the hpt pages
 384          * The rest of the pages of the load area
 385          * aren't in the HPT yet and can still
 386          * be assigned an arbitrary physical address
 387          */
 388         if ((loadAreaSize * 64) > HvPagesToMap)
 389                 loadAreaSize = HvPagesToMap / 64;
 390
 391         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 392
 393         /*
 394          * TODO Do we need to do something if the HPT is in the 64MB load area?
 395          * This would be required if the itLpNaca.xLoadAreaChunks includes
 396          * the HPT size
 397          */
 398
 399         printk("Mapping load area - physical addr = 0000000000000000\n"
 400                 "                    absolute addr = %016lx\n",
 401                 chunk_to_addr(loadAreaFirstChunk));
 402         printk("Load area size %dK\n", loadAreaSize * 256);
 403
 404         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 405                 mschunks_map.mapping[nextPhysChunk] =
 406                         loadAreaFirstChunk + nextPhysChunk;
 407
 408         /*
 409          * Get absolute address of our HPT and remember it so
 410          * we won't map it to any physical address
 411          */
 412         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 413         hptSizePages = (u32)HvCallHpt_getHptPages();
 414         hptSizeChunks = hptSizePages >>
 415                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 416         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 417
 418         printk("HPT absolute addr = %016lx, size = %dK\n",
 419                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 420
 421         /*
 422          * Determine if absolute memory has any
 423          * holes so that we can interpret the
 424          * access map we get back from the hypervisor
 425          * correctly.
 426          */
 427         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 428
 429         /*
 430          * Process the main store access map from the hypervisor
 431          * to build up our physical -> absolute translation table
 432          */
 433         curBlock = 0;
 434         currChunk = 0;
 435         currDword = 0;
 436         moreChunks = totalChunks;
 437
 438         while (moreChunks) {
 439                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 440                                 currDword);
 441                 thisChunk = currChunk;
 442                 while (map) {
 443                         chunkBit = map >> 63;
 444                         map <<= 1;
 445                         if (chunkBit) {
 446                                 --moreChunks;
 447                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 448                                         ++curBlock;
 449                                         if (curBlock >= numMemoryBlocks)
 450                                                 panic("out of memory blocks");
 451                                 }
 452                                 if (thisChunk < mb[curBlock].logicalStart)
 453                                         panic("memory block error");
 454
 455                                 absChunk = mb[curBlock].absStart +
 456                                         (thisChunk - mb[curBlock].logicalStart);
 457                                 if (((absChunk < hptFirstChunk) ||
 458                                      (absChunk > hptLastChunk)) &&
 459                                     ((absChunk < loadAreaFirstChunk) ||
 460                                      (absChunk > loadAreaLastChunk))) {
 461                                         mschunks_map.mapping[nextPhysChunk] =
 462                                                 absChunk;
 463                                         ++nextPhysChunk;
 464                                 }
 465                         }
 466                         ++thisChunk;
 467                 }
 468                 ++currDword;
 469                 currChunk += 64;
 470         }
 471
 472         /*
 473          * main store size (in chunks) is
 474          *   totalChunks - hptSizeChunks
 475          * which should be equal to
 476          *   nextPhysChunk
 477          */
 478         return chunk_to_addr(nextPhysChunk);
 479 }
 480
 481 /*
 482  * Document me.
 483  */
 484 static void __init iSeries_setup_arch(void)
 485 {
 486         if (get_lppaca()->shared_proc) {
 487                 ppc_md.idle_loop = iseries_shared_idle;
 488                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 489         } else {
 490                 ppc_md.idle_loop = iseries_dedicated_idle;
 491                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 492         }
 493
 494         /* Setup the Lp Event Queue */
 495         setup_hvlpevent_queue();
 496
 497         printk("Max  logical processors = %d\n",
 498                         itVpdAreas.xSlicMaxLogicalProcs);
 499         printk("Max physical processors = %d\n",
 500                         itVpdAreas.xSlicMaxPhysicalProcs);
 501 }
 502
 503 static void iSeries_show_cpuinfo(struct seq_file *m)
 504 {
 505         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 506 }
 507
 508 static void __init iSeries_progress(char * st, unsigned short code)
 509 {
 510         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 511         mf_display_progress(code);
 512 }
 513
 514 static void __init iSeries_fixup_klimit(void)
 515 {
 516         /*
 517          * Change klimit to take into account any ram disk
 518          * that may be included
 519          */
 520         if (naca.xRamDisk)
 521                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 522                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 523 }
 524
 525 static int __init iSeries_src_init(void)
 526 {
 527         /* clear the progress line */
 528         if (firmware_has_feature(FW_FEATURE_ISERIES))
 529                 ppc_md.progress(" ", 0xffff);
 530         return 0;
 531 }
 532
 533 late_initcall(iSeries_src_init);
 534
 535 static inline void process_iSeries_events(void)
 536 {
 537         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 538 }
 539
 540 static void yield_shared_processor(void)
 541 {
 542         unsigned long tb;
 543
 544         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 545                                     HvCall_MaskLpEvent |
 546                                     HvCall_MaskLpProd |
 547                                     HvCall_MaskTimeout);
 548
 549         tb = get_tb();
 550         /* Compute future tb value when yield should expire */
 551         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 552
 553         /*
 554          * The decrementer stops during the yield.  Force a fake decrementer
 555          * here and let the timer_interrupt code sort out the actual time.
 556          */
 557         get_lppaca()->int_dword.fields.decr_int = 1;
 558         ppc64_runlatch_on();
 559         process_iSeries_events();
 560 }
 561
 562 static void iseries_shared_idle(void)
 563 {
 564         while (1) {
 565                 while (!need_resched() && !hvlpevent_is_pending()) {
 566                         local_irq_disable();
 567                         ppc64_runlatch_off();
 568
 569                         /* Recheck with irqs off */
 570                         if (!need_resched() && !hvlpevent_is_pending())
 571                                 yield_shared_processor();
 572
 573                         HMT_medium();
 574                         local_irq_enable();
 575                 }
 576
 577                 ppc64_runlatch_on();
 578
 579                 if (hvlpevent_is_pending())
 580                         process_iSeries_events();
 581
 582                 preempt_enable_no_resched();
 583                 schedule();
 584                 preempt_disable();
 585         }
 586 }
 587
 588 static void iseries_dedicated_idle(void)
 589 {
 590         set_thread_flag(TIF_POLLING_NRFLAG);
 591
 592         while (1) {
 593                 if (!need_resched()) {
 594                         while (!need_resched()) {
 595                                 ppc64_runlatch_off();
 596                                 HMT_low();
 597
 598                                 if (hvlpevent_is_pending()) {
 599                                         HMT_medium();
 600                                         ppc64_runlatch_on();
 601                                         process_iSeries_events();
 602                                 }
 603                         }
 604
 605                         HMT_medium();
 606                 }
 607
 608                 ppc64_runlatch_on();
 609                 preempt_enable_no_resched();
 610                 schedule();
 611                 preempt_disable();
 612         }
 613 }
 614
 615 #ifndef CONFIG_PCI
 616 void __init iSeries_init_IRQ(void) { }
 617 #endif
 618
 619 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
 620                                      unsigned long flags)
 621 {
 622         return (void __iomem *)address;
 623 }
 624
 625 static void iseries_iounmap(volatile void __iomem *token)
 626 {
 627 }
 628
 629 static int __init iseries_probe(void)
 630 {
 631         unsigned long root = of_get_flat_dt_root();
 632         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 633                 return 0;
 634
 635         hpte_init_iSeries();
 636         /* iSeries does not support 16M pages */
 637         cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;
 638
 639         return 1;
 640 }
 641
 642 define_machine(iseries) {
 643         .name           = "iSeries",
 644         .setup_arch     = iSeries_setup_arch,
 645         .show_cpuinfo   = iSeries_show_cpuinfo,
 646         .init_IRQ       = iSeries_init_IRQ,
 647         .get_irq        = iSeries_get_irq,
 648         .init_early     = iSeries_init_early,
 649         .pcibios_fixup  = iSeries_pci_final_fixup,
 650         .restart        = mf_reboot,
 651         .power_off      = mf_power_off,
 652         .halt           = mf_power_off,
 653         .get_boot_time  = iSeries_get_boot_time,
 654         .set_rtc_time   = iSeries_set_rtc_time,
 655         .get_rtc_time   = iSeries_get_rtc_time,
 656         .calibrate_decr = generic_calibrate_decr,
 657         .progress       = iSeries_progress,
 658         .probe          = iseries_probe,
 659         .ioremap        = iseries_ioremap,
 660         .iounmap        = iseries_iounmap,
 661         /* XXX Implement enable_pmcs for iSeries */
 662 };
 663
 664 void * __init iSeries_early_setup(void)
 665 {
 666         unsigned long phys_mem_size;
 667
 668         /* Identify CPU type. This is done again by the common code later
 669          * on but calling this function multiple times is fine.
 670          */
 671         identify_cpu(0, mfspr(SPRN_PVR));
 672
 673         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 674         powerpc_firmware_features |= FW_FEATURE_LPAR;
 675
 676         iSeries_fixup_klimit();
 677
 678         /*
 679          * Initialize the table which translate Linux physical addresses to
 680          * AS/400 absolute addresses
 681          */
 682         phys_mem_size = build_iSeries_Memory_Map();
 683
 684         iSeries_get_cmdline();
 685
 686         return (void *) __pa(build_flat_dt(phys_mem_size));
 687 }
 688
 689 static void hvputc(char c)
 690 {
 691         if (c == '\n')
 692                 hvputc('\r');
 693
 694         HvCall_writeLogBuffer(&c, 1);
 695 }
 696
 697 void __init udbg_init_iseries(void)
 698 {
 699         udbg_putc = hvputc;
 700 }