git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/hrtimer.h>
  30 #include <linux/tick.h>
  31
  32 #include <asm/processor.h>
  33 #include <asm/machdep.h>
  34 #include <asm/page.h>
  35 #include <asm/mmu.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/mmu_context.h>
  38 #include <asm/cputable.h>
  39 #include <asm/sections.h>
  40 #include <asm/iommu.h>
  41 #include <asm/firmware.h>
  42 #include <asm/system.h>
  43 #include <asm/time.h>
  44 #include <asm/paca.h>
  45 #include <asm/cache.h>
  46 #include <asm/abs_addr.h>
  47 #include <asm/iseries/hv_lp_config.h>
  48 #include <asm/iseries/hv_call_event.h>
  49 #include <asm/iseries/hv_call_xm.h>
  50 #include <asm/iseries/it_lp_queue.h>
  51 #include <asm/iseries/mf.h>
  52 #include <asm/iseries/hv_lp_event.h>
  53 #include <asm/iseries/lpar_map.h>
  54 #include <asm/udbg.h>
  55 #include <asm/irq.h>
  56
  57 #include "naca.h"
  58 #include "setup.h"
  59 #include "irq.h"
  60 #include "vpd_areas.h"
  61 #include "processor_vpd.h"
  62 #include "it_lp_naca.h"
  63 #include "main_store.h"
  64 #include "call_sm.h"
  65 #include "call_hpt.h"
  66
  67 #ifdef DEBUG
  68 #define DBG(fmt...) udbg_printf(fmt)
  69 #else
  70 #define DBG(fmt...)
  71 #endif
  72
  73 /* Function Prototypes */
  74 static unsigned long build_iSeries_Memory_Map(void);
  75 static void iseries_shared_idle(void);
  76 static void iseries_dedicated_idle(void);
  77 #ifdef CONFIG_PCI
  78 extern void iSeries_pci_final_fixup(void);
  79 #else
  80 static void iSeries_pci_final_fixup(void) { }
  81 #endif
  82
  83
  84 struct MemoryBlock {
  85         unsigned long absStart;
  86         unsigned long absEnd;
  87         unsigned long logicalStart;
  88         unsigned long logicalEnd;
  89 };
  90
  91 /*
  92  * Process the main store vpd to determine where the holes in memory are
  93  * and return the number of physical blocks and fill in the array of
  94  * block data.
  95  */
  96 static unsigned long iSeries_process_Condor_mainstore_vpd(
  97                 struct MemoryBlock *mb_array, unsigned long max_entries)
  98 {
  99         unsigned long holeFirstChunk, holeSizeChunks;
 100         unsigned long numMemoryBlocks = 1;
 101         struct IoHriMainStoreSegment4 *msVpd =
 102                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 103         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 104         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 105         unsigned long holeSize = holeEnd - holeStart;
 106
 107         printk("Mainstore_VPD: Condor\n");
 108         /*
 109          * Determine if absolute memory has any
 110          * holes so that we can interpret the
 111          * access map we get back from the hypervisor
 112          * correctly.
 113          */
 114         mb_array[0].logicalStart = 0;
 115         mb_array[0].logicalEnd = 0x100000000;
 116         mb_array[0].absStart = 0;
 117         mb_array[0].absEnd = 0x100000000;
 118
 119         if (holeSize) {
 120                 numMemoryBlocks = 2;
 121                 holeStart = holeStart & 0x000fffffffffffff;
 122                 holeStart = addr_to_chunk(holeStart);
 123                 holeFirstChunk = holeStart;
 124                 holeSize = addr_to_chunk(holeSize);
 125                 holeSizeChunks = holeSize;
 126                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 127                                 holeFirstChunk, holeSizeChunks );
 128                 mb_array[0].logicalEnd = holeFirstChunk;
 129                 mb_array[0].absEnd = holeFirstChunk;
 130                 mb_array[1].logicalStart = holeFirstChunk;
 131                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 132                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 133                 mb_array[1].absEnd = 0x100000000;
 134         }
 135         return numMemoryBlocks;
 136 }
 137
 138 #define MaxSegmentAreas                 32
 139 #define MaxSegmentAdrRangeBlocks        128
 140 #define MaxAreaRangeBlocks              4
 141
 142 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 143                 struct MemoryBlock *mb_array, unsigned long max_entries)
 144 {
 145         struct IoHriMainStoreSegment5 *msVpdP =
 146                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 147         unsigned long numSegmentBlocks = 0;
 148         u32 existsBits = msVpdP->msAreaExists;
 149         unsigned long area_num;
 150
 151         printk("Mainstore_VPD: Regatta\n");
 152
 153         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 154                 unsigned long numAreaBlocks;
 155                 struct IoHriMainStoreArea4 *currentArea;
 156
 157                 if (existsBits & 0x80000000) {
 158                         unsigned long block_num;
 159
 160                         currentArea = &msVpdP->msAreaArray[area_num];
 161                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 162                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 163                                         area_num, numAreaBlocks);
 164                         for (block_num = 0; block_num < numAreaBlocks;
 165                                         ++block_num ) {
 166                                 /* Process an address range block */
 167                                 struct MemoryBlock tempBlock;
 168                                 unsigned long i;
 169
 170                                 tempBlock.absStart =
 171                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 172                                 tempBlock.absEnd =
 173                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 174                                 tempBlock.logicalStart = 0;
 175                                 tempBlock.logicalEnd   = 0;
 176                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 177                                                 block_num, tempBlock.absStart,
 178                                                 tempBlock.absEnd);
 179
 180                                 for (i = 0; i < numSegmentBlocks; ++i) {
 181                                         if (mb_array[i].absStart ==
 182                                                         tempBlock.absStart)
 183                                                 break;
 184                                 }
 185                                 if (i == numSegmentBlocks) {
 186                                         if (numSegmentBlocks == max_entries)
 187                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 188                                         mb_array[numSegmentBlocks] = tempBlock;
 189                                         ++numSegmentBlocks;
 190                                 } else
 191                                         printk(" (duplicate)");
 192                         }
 193                         printk("\n");
 194                 }
 195                 existsBits <<= 1;
 196         }
 197         /* Now sort the blocks found into ascending sequence */
 198         if (numSegmentBlocks > 1) {
 199                 unsigned long m, n;
 200
 201                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 202                         for (n = numSegmentBlocks - 1; m < n; --n) {
 203                                 if (mb_array[n].absStart <
 204                                                 mb_array[n-1].absStart) {
 205                                         struct MemoryBlock tempBlock;
 206
 207                                         tempBlock = mb_array[n];
 208                                         mb_array[n] = mb_array[n-1];
 209                                         mb_array[n-1] = tempBlock;
 210                                 }
 211                         }
 212                 }
 213         }
 214         /*
 215          * Assign "logical" addresses to each block.  These
 216          * addresses correspond to the hypervisor "bitmap" space.
 217          * Convert all addresses into units of 256K chunks.
 218          */
 219         {
 220         unsigned long i, nextBitmapAddress;
 221
 222         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 223         nextBitmapAddress = 0;
 224         for (i = 0; i < numSegmentBlocks; ++i) {
 225                 unsigned long length = mb_array[i].absEnd -
 226                         mb_array[i].absStart;
 227
 228                 mb_array[i].logicalStart = nextBitmapAddress;
 229                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 230                 nextBitmapAddress += length;
 231                 printk("          Bitmap range: %016lx - %016lx\n"
 232                                 "        Absolute range: %016lx - %016lx\n",
 233                                 mb_array[i].logicalStart,
 234                                 mb_array[i].logicalEnd,
 235                                 mb_array[i].absStart, mb_array[i].absEnd);
 236                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 237                                 0x000fffffffffffff);
 238                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 239                                 0x000fffffffffffff);
 240                 mb_array[i].logicalStart =
 241                         addr_to_chunk(mb_array[i].logicalStart);
 242                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 243         }
 244         }
 245
 246         return numSegmentBlocks;
 247 }
 248
 249 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 250                 unsigned long max_entries)
 251 {
 252         unsigned long i;
 253         unsigned long mem_blocks = 0;
 254
 255         if (cpu_has_feature(CPU_FTR_SLB))
 256                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 257                                 max_entries);
 258         else
 259                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 260                                 max_entries);
 261
 262         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 263         for (i = 0; i < mem_blocks; ++i) {
 264                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 265                        "                             abs chunks %016lx - %016lx\n",
 266                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 267                         mb_array[i].absStart, mb_array[i].absEnd);
 268         }
 269         return mem_blocks;
 270 }
 271
 272 static void __init iSeries_get_cmdline(void)
 273 {
 274         char *p, *q;
 275
 276         /* copy the command line parameter from the primary VSP  */
 277         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 278                         HvLpDma_Direction_RemoteToLocal);
 279
 280         p = cmd_line;
 281         q = cmd_line + 255;
 282         while(p < q) {
 283                 if (!*p || *p == '\n')
 284                         break;
 285                 ++p;
 286         }
 287         *p = 0;
 288 }
 289
 290 static void __init iSeries_init_early(void)
 291 {
 292         DBG(" -> iSeries_init_early()\n");
 293
 294         /* Snapshot the timebase, for use in later recalibration */
 295         iSeries_time_init_early();
 296
 297         /*
 298          * Initialize the DMA/TCE management
 299          */
 300         iommu_init_early_iSeries();
 301
 302         /* Initialize machine-dependency vectors */
 303 #ifdef CONFIG_SMP
 304         smp_init_iSeries();
 305 #endif
 306
 307         /* Associate Lp Event Queue 0 with processor 0 */
 308         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 309
 310         mf_init();
 311
 312         DBG(" <- iSeries_init_early()\n");
 313 }
 314
 315 struct mschunks_map mschunks_map = {
 316         /* XXX We don't use these, but Piranha might need them. */
 317         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 318         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 319         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 320 };
 321 EXPORT_SYMBOL(mschunks_map);
 322
 323 void mschunks_alloc(unsigned long num_chunks)
 324 {
 325         klimit = _ALIGN(klimit, sizeof(u32));
 326         mschunks_map.mapping = (u32 *)klimit;
 327         klimit += num_chunks * sizeof(u32);
 328         mschunks_map.num_chunks = num_chunks;
 329 }
 330
 331 /*
 332  * The iSeries may have very large memories ( > 128 GB ) and a partition
 333  * may get memory in "chunks" that may be anywhere in the 2**52 real
 334  * address space.  The chunks are 256K in size.  To map this to the
 335  * memory model Linux expects, the AS/400 specific code builds a
 336  * translation table to translate what Linux thinks are "physical"
 337  * addresses to the actual real addresses.  This allows us to make
 338  * it appear to Linux that we have contiguous memory starting at
 339  * physical address zero while in fact this could be far from the truth.
 340  * To avoid confusion, I'll let the words physical and/or real address
 341  * apply to the Linux addresses while I'll use "absolute address" to
 342  * refer to the actual hardware real address.
 343  *
 344  * build_iSeries_Memory_Map gets information from the Hypervisor and
 345  * looks at the Main Store VPD to determine the absolute addresses
 346  * of the memory that has been assigned to our partition and builds
 347  * a table used to translate Linux's physical addresses to these
 348  * absolute addresses.  Absolute addresses are needed when
 349  * communicating with the hypervisor (e.g. to build HPT entries)
 350  *
 351  * Returns the physical memory size
 352  */
 353
 354 static unsigned long __init build_iSeries_Memory_Map(void)
 355 {
 356         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 357         u32 nextPhysChunk;
 358         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 359         u32 totalChunks,moreChunks;
 360         u32 currChunk, thisChunk, absChunk;
 361         u32 currDword;
 362         u32 chunkBit;
 363         u64 map;
 364         struct MemoryBlock mb[32];
 365         unsigned long numMemoryBlocks, curBlock;
 366
 367         /* Chunk size on iSeries is 256K bytes */
 368         totalChunks = (u32)HvLpConfig_getMsChunks();
 369         mschunks_alloc(totalChunks);
 370
 371         /*
 372          * Get absolute address of our load area
 373          * and map it to physical address 0
 374          * This guarantees that the loadarea ends up at physical 0
 375          * otherwise, it might not be returned by PLIC as the first
 376          * chunks
 377          */
 378
 379         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 380         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 381
 382         /*
 383          * Only add the pages already mapped here.
 384          * Otherwise we might add the hpt pages
 385          * The rest of the pages of the load area
 386          * aren't in the HPT yet and can still
 387          * be assigned an arbitrary physical address
 388          */
 389         if ((loadAreaSize * 64) > HvPagesToMap)
 390                 loadAreaSize = HvPagesToMap / 64;
 391
 392         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 393
 394         /*
 395          * TODO Do we need to do something if the HPT is in the 64MB load area?
 396          * This would be required if the itLpNaca.xLoadAreaChunks includes
 397          * the HPT size
 398          */
 399
 400         printk("Mapping load area - physical addr = 0000000000000000\n"
 401                 "                    absolute addr = %016lx\n",
 402                 chunk_to_addr(loadAreaFirstChunk));
 403         printk("Load area size %dK\n", loadAreaSize * 256);
 404
 405         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 406                 mschunks_map.mapping[nextPhysChunk] =
 407                         loadAreaFirstChunk + nextPhysChunk;
 408
 409         /*
 410          * Get absolute address of our HPT and remember it so
 411          * we won't map it to any physical address
 412          */
 413         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 414         hptSizePages = (u32)HvCallHpt_getHptPages();
 415         hptSizeChunks = hptSizePages >>
 416                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 417         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 418
 419         printk("HPT absolute addr = %016lx, size = %dK\n",
 420                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 421
 422         /*
 423          * Determine if absolute memory has any
 424          * holes so that we can interpret the
 425          * access map we get back from the hypervisor
 426          * correctly.
 427          */
 428         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 429
 430         /*
 431          * Process the main store access map from the hypervisor
 432          * to build up our physical -> absolute translation table
 433          */
 434         curBlock = 0;
 435         currChunk = 0;
 436         currDword = 0;
 437         moreChunks = totalChunks;
 438
 439         while (moreChunks) {
 440                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 441                                 currDword);
 442                 thisChunk = currChunk;
 443                 while (map) {
 444                         chunkBit = map >> 63;
 445                         map <<= 1;
 446                         if (chunkBit) {
 447                                 --moreChunks;
 448                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 449                                         ++curBlock;
 450                                         if (curBlock >= numMemoryBlocks)
 451                                                 panic("out of memory blocks");
 452                                 }
 453                                 if (thisChunk < mb[curBlock].logicalStart)
 454                                         panic("memory block error");
 455
 456                                 absChunk = mb[curBlock].absStart +
 457                                         (thisChunk - mb[curBlock].logicalStart);
 458                                 if (((absChunk < hptFirstChunk) ||
 459                                      (absChunk > hptLastChunk)) &&
 460                                     ((absChunk < loadAreaFirstChunk) ||
 461                                      (absChunk > loadAreaLastChunk))) {
 462                                         mschunks_map.mapping[nextPhysChunk] =
 463                                                 absChunk;
 464                                         ++nextPhysChunk;
 465                                 }
 466                         }
 467                         ++thisChunk;
 468                 }
 469                 ++currDword;
 470                 currChunk += 64;
 471         }
 472
 473         /*
 474          * main store size (in chunks) is
 475          *   totalChunks - hptSizeChunks
 476          * which should be equal to
 477          *   nextPhysChunk
 478          */
 479         return chunk_to_addr(nextPhysChunk);
 480 }
 481
 482 /*
 483  * Document me.
 484  */
 485 static void __init iSeries_setup_arch(void)
 486 {
 487         if (get_lppaca()->shared_proc) {
 488                 ppc_md.idle_loop = iseries_shared_idle;
 489                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 490         } else {
 491                 ppc_md.idle_loop = iseries_dedicated_idle;
 492                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 493         }
 494
 495         /* Setup the Lp Event Queue */
 496         setup_hvlpevent_queue();
 497
 498         printk("Max  logical processors = %d\n",
 499                         itVpdAreas.xSlicMaxLogicalProcs);
 500         printk("Max physical processors = %d\n",
 501                         itVpdAreas.xSlicMaxPhysicalProcs);
 502 }
 503
 504 static void iSeries_show_cpuinfo(struct seq_file *m)
 505 {
 506         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 507 }
 508
 509 static void __init iSeries_progress(char * st, unsigned short code)
 510 {
 511         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 512         mf_display_progress(code);
 513 }
 514
 515 static void __init iSeries_fixup_klimit(void)
 516 {
 517         /*
 518          * Change klimit to take into account any ram disk
 519          * that may be included
 520          */
 521         if (naca.xRamDisk)
 522                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 523                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 524 }
 525
 526 static int __init iSeries_src_init(void)
 527 {
 528         /* clear the progress line */
 529         if (firmware_has_feature(FW_FEATURE_ISERIES))
 530                 ppc_md.progress(" ", 0xffff);
 531         return 0;
 532 }
 533
 534 late_initcall(iSeries_src_init);
 535
 536 static inline void process_iSeries_events(void)
 537 {
 538         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 539 }
 540
 541 static void yield_shared_processor(void)
 542 {
 543         unsigned long tb;
 544
 545         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 546                                     HvCall_MaskLpEvent |
 547                                     HvCall_MaskLpProd |
 548                                     HvCall_MaskTimeout);
 549
 550         tb = get_tb();
 551         /* Compute future tb value when yield should expire */
 552         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 553
 554         /*
 555          * The decrementer stops during the yield.  Force a fake decrementer
 556          * here and let the timer_interrupt code sort out the actual time.
 557          */
 558         get_lppaca()->int_dword.fields.decr_int = 1;
 559         ppc64_runlatch_on();
 560         process_iSeries_events();
 561 }
 562
 563 static void iseries_shared_idle(void)
 564 {
 565         while (1) {
 566                 tick_nohz_stop_sched_tick();
 567                 while (!need_resched() && !hvlpevent_is_pending()) {
 568                         local_irq_disable();
 569                         ppc64_runlatch_off();
 570
 571                         /* Recheck with irqs off */
 572                         if (!need_resched() && !hvlpevent_is_pending())
 573                                 yield_shared_processor();
 574
 575                         HMT_medium();
 576                         local_irq_enable();
 577                 }
 578
 579                 ppc64_runlatch_on();
 580                 tick_nohz_restart_sched_tick();
 581
 582                 if (hvlpevent_is_pending())
 583                         process_iSeries_events();
 584
 585                 preempt_enable_no_resched();
 586                 schedule();
 587                 preempt_disable();
 588         }
 589 }
 590
 591 static void iseries_dedicated_idle(void)
 592 {
 593         set_thread_flag(TIF_POLLING_NRFLAG);
 594
 595         while (1) {
 596                 tick_nohz_stop_sched_tick();
 597                 if (!need_resched()) {
 598                         while (!need_resched()) {
 599                                 ppc64_runlatch_off();
 600                                 HMT_low();
 601
 602                                 if (hvlpevent_is_pending()) {
 603                                         HMT_medium();
 604                                         ppc64_runlatch_on();
 605                                         process_iSeries_events();
 606                                 }
 607                         }
 608
 609                         HMT_medium();
 610                 }
 611
 612                 ppc64_runlatch_on();
 613                 tick_nohz_restart_sched_tick();
 614                 preempt_enable_no_resched();
 615                 schedule();
 616                 preempt_disable();
 617         }
 618 }
 619
 620 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
 621                                      unsigned long flags)
 622 {
 623         return (void __iomem *)address;
 624 }
 625
 626 static void iseries_iounmap(volatile void __iomem *token)
 627 {
 628 }
 629
 630 static int __init iseries_probe(void)
 631 {
 632         unsigned long root = of_get_flat_dt_root();
 633         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 634                 return 0;
 635
 636         hpte_init_iSeries();
 637         /* iSeries does not support 16M pages */
 638         cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;
 639
 640         return 1;
 641 }
 642
 643 define_machine(iseries) {
 644         .name           = "iSeries",
 645         .setup_arch     = iSeries_setup_arch,
 646         .show_cpuinfo   = iSeries_show_cpuinfo,
 647         .init_IRQ       = iSeries_init_IRQ,
 648         .get_irq        = iSeries_get_irq,
 649         .init_early     = iSeries_init_early,
 650         .pcibios_fixup  = iSeries_pci_final_fixup,
 651         .restart        = mf_reboot,
 652         .power_off      = mf_power_off,
 653         .halt           = mf_power_off,
 654         .get_boot_time  = iSeries_get_boot_time,
 655         .set_rtc_time   = iSeries_set_rtc_time,
 656         .get_rtc_time   = iSeries_get_rtc_time,
 657         .calibrate_decr = generic_calibrate_decr,
 658         .progress       = iSeries_progress,
 659         .probe          = iseries_probe,
 660         .ioremap        = iseries_ioremap,
 661         .iounmap        = iseries_iounmap,
 662         /* XXX Implement enable_pmcs for iSeries */
 663 };
 664
 665 void * __init iSeries_early_setup(void)
 666 {
 667         unsigned long phys_mem_size;
 668
 669         /* Identify CPU type. This is done again by the common code later
 670          * on but calling this function multiple times is fine.
 671          */
 672         identify_cpu(0, mfspr(SPRN_PVR));
 673
 674         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 675         powerpc_firmware_features |= FW_FEATURE_LPAR;
 676
 677         iSeries_fixup_klimit();
 678
 679         /*
 680          * Initialize the table which translate Linux physical addresses to
 681          * AS/400 absolute addresses
 682          */
 683         phys_mem_size = build_iSeries_Memory_Map();
 684
 685         iSeries_get_cmdline();
 686
 687         return (void *) __pa(build_flat_dt(phys_mem_size));
 688 }
 689
 690 static void hvputc(char c)
 691 {
 692         if (c == '\n')
 693                 hvputc('\r');
 694
 695         HvCall_writeLogBuffer(&c, 1);
 696 }
 697
 698 void __init udbg_init_iseries(void)
 699 {
 700         udbg_putc = hvputc;
 701 }