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
  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 extern unsigned long iSeries_recal_tb;
  83 extern unsigned long iSeries_recal_titan;
  84
  85 struct MemoryBlock {
  86         unsigned long absStart;
  87         unsigned long absEnd;
  88         unsigned long logicalStart;
  89         unsigned long logicalEnd;
  90 };
  91
  92 /*
  93  * Process the main store vpd to determine where the holes in memory are
  94  * and return the number of physical blocks and fill in the array of
  95  * block data.
  96  */
  97 static unsigned long iSeries_process_Condor_mainstore_vpd(
  98                 struct MemoryBlock *mb_array, unsigned long max_entries)
  99 {
 100         unsigned long holeFirstChunk, holeSizeChunks;
 101         unsigned long numMemoryBlocks = 1;
 102         struct IoHriMainStoreSegment4 *msVpd =
 103                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 104         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 105         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 106         unsigned long holeSize = holeEnd - holeStart;
 107
 108         printk("Mainstore_VPD: Condor\n");
 109         /*
 110          * Determine if absolute memory has any
 111          * holes so that we can interpret the
 112          * access map we get back from the hypervisor
 113          * correctly.
 114          */
 115         mb_array[0].logicalStart = 0;
 116         mb_array[0].logicalEnd = 0x100000000;
 117         mb_array[0].absStart = 0;
 118         mb_array[0].absEnd = 0x100000000;
 119
 120         if (holeSize) {
 121                 numMemoryBlocks = 2;
 122                 holeStart = holeStart & 0x000fffffffffffff;
 123                 holeStart = addr_to_chunk(holeStart);
 124                 holeFirstChunk = holeStart;
 125                 holeSize = addr_to_chunk(holeSize);
 126                 holeSizeChunks = holeSize;
 127                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 128                                 holeFirstChunk, holeSizeChunks );
 129                 mb_array[0].logicalEnd = holeFirstChunk;
 130                 mb_array[0].absEnd = holeFirstChunk;
 131                 mb_array[1].logicalStart = holeFirstChunk;
 132                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 133                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 134                 mb_array[1].absEnd = 0x100000000;
 135         }
 136         return numMemoryBlocks;
 137 }
 138
 139 #define MaxSegmentAreas                 32
 140 #define MaxSegmentAdrRangeBlocks        128
 141 #define MaxAreaRangeBlocks              4
 142
 143 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 144                 struct MemoryBlock *mb_array, unsigned long max_entries)
 145 {
 146         struct IoHriMainStoreSegment5 *msVpdP =
 147                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 148         unsigned long numSegmentBlocks = 0;
 149         u32 existsBits = msVpdP->msAreaExists;
 150         unsigned long area_num;
 151
 152         printk("Mainstore_VPD: Regatta\n");
 153
 154         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 155                 unsigned long numAreaBlocks;
 156                 struct IoHriMainStoreArea4 *currentArea;
 157
 158                 if (existsBits & 0x80000000) {
 159                         unsigned long block_num;
 160
 161                         currentArea = &msVpdP->msAreaArray[area_num];
 162                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 163                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 164                                         area_num, numAreaBlocks);
 165                         for (block_num = 0; block_num < numAreaBlocks;
 166                                         ++block_num ) {
 167                                 /* Process an address range block */
 168                                 struct MemoryBlock tempBlock;
 169                                 unsigned long i;
 170
 171                                 tempBlock.absStart =
 172                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 173                                 tempBlock.absEnd =
 174                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 175                                 tempBlock.logicalStart = 0;
 176                                 tempBlock.logicalEnd   = 0;
 177                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 178                                                 block_num, tempBlock.absStart,
 179                                                 tempBlock.absEnd);
 180
 181                                 for (i = 0; i < numSegmentBlocks; ++i) {
 182                                         if (mb_array[i].absStart ==
 183                                                         tempBlock.absStart)
 184                                                 break;
 185                                 }
 186                                 if (i == numSegmentBlocks) {
 187                                         if (numSegmentBlocks == max_entries)
 188                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 189                                         mb_array[numSegmentBlocks] = tempBlock;
 190                                         ++numSegmentBlocks;
 191                                 } else
 192                                         printk(" (duplicate)");
 193                         }
 194                         printk("\n");
 195                 }
 196                 existsBits <<= 1;
 197         }
 198         /* Now sort the blocks found into ascending sequence */
 199         if (numSegmentBlocks > 1) {
 200                 unsigned long m, n;
 201
 202                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 203                         for (n = numSegmentBlocks - 1; m < n; --n) {
 204                                 if (mb_array[n].absStart <
 205                                                 mb_array[n-1].absStart) {
 206                                         struct MemoryBlock tempBlock;
 207
 208                                         tempBlock = mb_array[n];
 209                                         mb_array[n] = mb_array[n-1];
 210                                         mb_array[n-1] = tempBlock;
 211                                 }
 212                         }
 213                 }
 214         }
 215         /*
 216          * Assign "logical" addresses to each block.  These
 217          * addresses correspond to the hypervisor "bitmap" space.
 218          * Convert all addresses into units of 256K chunks.
 219          */
 220         {
 221         unsigned long i, nextBitmapAddress;
 222
 223         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 224         nextBitmapAddress = 0;
 225         for (i = 0; i < numSegmentBlocks; ++i) {
 226                 unsigned long length = mb_array[i].absEnd -
 227                         mb_array[i].absStart;
 228
 229                 mb_array[i].logicalStart = nextBitmapAddress;
 230                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 231                 nextBitmapAddress += length;
 232                 printk("          Bitmap range: %016lx - %016lx\n"
 233                                 "        Absolute range: %016lx - %016lx\n",
 234                                 mb_array[i].logicalStart,
 235                                 mb_array[i].logicalEnd,
 236                                 mb_array[i].absStart, mb_array[i].absEnd);
 237                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 238                                 0x000fffffffffffff);
 239                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 240                                 0x000fffffffffffff);
 241                 mb_array[i].logicalStart =
 242                         addr_to_chunk(mb_array[i].logicalStart);
 243                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 244         }
 245         }
 246
 247         return numSegmentBlocks;
 248 }
 249
 250 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 251                 unsigned long max_entries)
 252 {
 253         unsigned long i;
 254         unsigned long mem_blocks = 0;
 255
 256         if (cpu_has_feature(CPU_FTR_SLB))
 257                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 258                                 max_entries);
 259         else
 260                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 261                                 max_entries);
 262
 263         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 264         for (i = 0; i < mem_blocks; ++i) {
 265                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 266                        "                             abs chunks %016lx - %016lx\n",
 267                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 268                         mb_array[i].absStart, mb_array[i].absEnd);
 269         }
 270         return mem_blocks;
 271 }
 272
 273 static void __init iSeries_get_cmdline(void)
 274 {
 275         char *p, *q;
 276
 277         /* copy the command line parameter from the primary VSP  */
 278         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 279                         HvLpDma_Direction_RemoteToLocal);
 280
 281         p = cmd_line;
 282         q = cmd_line + 255;
 283         while(p < q) {
 284                 if (!*p || *p == '\n')
 285                         break;
 286                 ++p;
 287         }
 288         *p = 0;
 289 }
 290
 291 static void __init iSeries_init_early(void)
 292 {
 293         DBG(" -> iSeries_init_early()\n");
 294
 295         iSeries_recal_tb = get_tb();
 296         iSeries_recal_titan = HvCallXm_loadTod();
 297
 298         /*
 299          * Initialize the DMA/TCE management
 300          */
 301         iommu_init_early_iSeries();
 302
 303         /* Initialize machine-dependency vectors */
 304 #ifdef CONFIG_SMP
 305         smp_init_iSeries();
 306 #endif
 307
 308         /* Associate Lp Event Queue 0 with processor 0 */
 309         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 310
 311         mf_init();
 312
 313         DBG(" <- iSeries_init_early()\n");
 314 }
 315
 316 struct mschunks_map mschunks_map = {
 317         /* XXX We don't use these, but Piranha might need them. */
 318         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 319         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 320         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 321 };
 322 EXPORT_SYMBOL(mschunks_map);
 323
 324 void mschunks_alloc(unsigned long num_chunks)
 325 {
 326         klimit = _ALIGN(klimit, sizeof(u32));
 327         mschunks_map.mapping = (u32 *)klimit;
 328         klimit += num_chunks * sizeof(u32);
 329         mschunks_map.num_chunks = num_chunks;
 330 }
 331
 332 /*
 333  * The iSeries may have very large memories ( > 128 GB ) and a partition
 334  * may get memory in "chunks" that may be anywhere in the 2**52 real
 335  * address space.  The chunks are 256K in size.  To map this to the
 336  * memory model Linux expects, the AS/400 specific code builds a
 337  * translation table to translate what Linux thinks are "physical"
 338  * addresses to the actual real addresses.  This allows us to make
 339  * it appear to Linux that we have contiguous memory starting at
 340  * physical address zero while in fact this could be far from the truth.
 341  * To avoid confusion, I'll let the words physical and/or real address
 342  * apply to the Linux addresses while I'll use "absolute address" to
 343  * refer to the actual hardware real address.
 344  *
 345  * build_iSeries_Memory_Map gets information from the Hypervisor and
 346  * looks at the Main Store VPD to determine the absolute addresses
 347  * of the memory that has been assigned to our partition and builds
 348  * a table used to translate Linux's physical addresses to these
 349  * absolute addresses.  Absolute addresses are needed when
 350  * communicating with the hypervisor (e.g. to build HPT entries)
 351  *
 352  * Returns the physical memory size
 353  */
 354
 355 static unsigned long __init build_iSeries_Memory_Map(void)
 356 {
 357         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 358         u32 nextPhysChunk;
 359         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 360         u32 totalChunks,moreChunks;
 361         u32 currChunk, thisChunk, absChunk;
 362         u32 currDword;
 363         u32 chunkBit;
 364         u64 map;
 365         struct MemoryBlock mb[32];
 366         unsigned long numMemoryBlocks, curBlock;
 367
 368         /* Chunk size on iSeries is 256K bytes */
 369         totalChunks = (u32)HvLpConfig_getMsChunks();
 370         mschunks_alloc(totalChunks);
 371
 372         /*
 373          * Get absolute address of our load area
 374          * and map it to physical address 0
 375          * This guarantees that the loadarea ends up at physical 0
 376          * otherwise, it might not be returned by PLIC as the first
 377          * chunks
 378          */
 379
 380         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 381         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 382
 383         /*
 384          * Only add the pages already mapped here.
 385          * Otherwise we might add the hpt pages
 386          * The rest of the pages of the load area
 387          * aren't in the HPT yet and can still
 388          * be assigned an arbitrary physical address
 389          */
 390         if ((loadAreaSize * 64) > HvPagesToMap)
 391                 loadAreaSize = HvPagesToMap / 64;
 392
 393         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 394
 395         /*
 396          * TODO Do we need to do something if the HPT is in the 64MB load area?
 397          * This would be required if the itLpNaca.xLoadAreaChunks includes
 398          * the HPT size
 399          */
 400
 401         printk("Mapping load area - physical addr = 0000000000000000\n"
 402                 "                    absolute addr = %016lx\n",
 403                 chunk_to_addr(loadAreaFirstChunk));
 404         printk("Load area size %dK\n", loadAreaSize * 256);
 405
 406         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 407                 mschunks_map.mapping[nextPhysChunk] =
 408                         loadAreaFirstChunk + nextPhysChunk;
 409
 410         /*
 411          * Get absolute address of our HPT and remember it so
 412          * we won't map it to any physical address
 413          */
 414         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 415         hptSizePages = (u32)HvCallHpt_getHptPages();
 416         hptSizeChunks = hptSizePages >>
 417                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 418         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 419
 420         printk("HPT absolute addr = %016lx, size = %dK\n",
 421                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 422
 423         /*
 424          * Determine if absolute memory has any
 425          * holes so that we can interpret the
 426          * access map we get back from the hypervisor
 427          * correctly.
 428          */
 429         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 430
 431         /*
 432          * Process the main store access map from the hypervisor
 433          * to build up our physical -> absolute translation table
 434          */
 435         curBlock = 0;
 436         currChunk = 0;
 437         currDword = 0;
 438         moreChunks = totalChunks;
 439
 440         while (moreChunks) {
 441                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 442                                 currDword);
 443                 thisChunk = currChunk;
 444                 while (map) {
 445                         chunkBit = map >> 63;
 446                         map <<= 1;
 447                         if (chunkBit) {
 448                                 --moreChunks;
 449                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 450                                         ++curBlock;
 451                                         if (curBlock >= numMemoryBlocks)
 452                                                 panic("out of memory blocks");
 453                                 }
 454                                 if (thisChunk < mb[curBlock].logicalStart)
 455                                         panic("memory block error");
 456
 457                                 absChunk = mb[curBlock].absStart +
 458                                         (thisChunk - mb[curBlock].logicalStart);
 459                                 if (((absChunk < hptFirstChunk) ||
 460                                      (absChunk > hptLastChunk)) &&
 461                                     ((absChunk < loadAreaFirstChunk) ||
 462                                      (absChunk > loadAreaLastChunk))) {
 463                                         mschunks_map.mapping[nextPhysChunk] =
 464                                                 absChunk;
 465                                         ++nextPhysChunk;
 466                                 }
 467                         }
 468                         ++thisChunk;
 469                 }
 470                 ++currDword;
 471                 currChunk += 64;
 472         }
 473
 474         /*
 475          * main store size (in chunks) is
 476          *   totalChunks - hptSizeChunks
 477          * which should be equal to
 478          *   nextPhysChunk
 479          */
 480         return chunk_to_addr(nextPhysChunk);
 481 }
 482
 483 /*
 484  * Document me.
 485  */
 486 static void __init iSeries_setup_arch(void)
 487 {
 488         if (get_lppaca()->shared_proc) {
 489                 ppc_md.idle_loop = iseries_shared_idle;
 490                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 491         } else {
 492                 ppc_md.idle_loop = iseries_dedicated_idle;
 493                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 494         }
 495
 496         /* Setup the Lp Event Queue */
 497         setup_hvlpevent_queue();
 498
 499         printk("Max  logical processors = %d\n",
 500                         itVpdAreas.xSlicMaxLogicalProcs);
 501         printk("Max physical processors = %d\n",
 502                         itVpdAreas.xSlicMaxPhysicalProcs);
 503 }
 504
 505 static void iSeries_show_cpuinfo(struct seq_file *m)
 506 {
 507         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 508 }
 509
 510 static void __init iSeries_progress(char * st, unsigned short code)
 511 {
 512         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 513         mf_display_progress(code);
 514 }
 515
 516 static void __init iSeries_fixup_klimit(void)
 517 {
 518         /*
 519          * Change klimit to take into account any ram disk
 520          * that may be included
 521          */
 522         if (naca.xRamDisk)
 523                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 524                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 525 }
 526
 527 static int __init iSeries_src_init(void)
 528 {
 529         /* clear the progress line */
 530         if (firmware_has_feature(FW_FEATURE_ISERIES))
 531                 ppc_md.progress(" ", 0xffff);
 532         return 0;
 533 }
 534
 535 late_initcall(iSeries_src_init);
 536
 537 static inline void process_iSeries_events(void)
 538 {
 539         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 540 }
 541
 542 static void yield_shared_processor(void)
 543 {
 544         unsigned long tb;
 545
 546         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 547                                     HvCall_MaskLpEvent |
 548                                     HvCall_MaskLpProd |
 549                                     HvCall_MaskTimeout);
 550
 551         tb = get_tb();
 552         /* Compute future tb value when yield should expire */
 553         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 554
 555         /*
 556          * The decrementer stops during the yield.  Force a fake decrementer
 557          * here and let the timer_interrupt code sort out the actual time.
 558          */
 559         get_lppaca()->int_dword.fields.decr_int = 1;
 560         ppc64_runlatch_on();
 561         process_iSeries_events();
 562 }
 563
 564 static void iseries_shared_idle(void)
 565 {
 566         while (1) {
 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
 581                 if (hvlpevent_is_pending())
 582                         process_iSeries_events();
 583
 584                 preempt_enable_no_resched();
 585                 schedule();
 586                 preempt_disable();
 587         }
 588 }
 589
 590 static void iseries_dedicated_idle(void)
 591 {
 592         set_thread_flag(TIF_POLLING_NRFLAG);
 593
 594         while (1) {
 595                 if (!need_resched()) {
 596                         while (!need_resched()) {
 597                                 ppc64_runlatch_off();
 598                                 HMT_low();
 599
 600                                 if (hvlpevent_is_pending()) {
 601                                         HMT_medium();
 602                                         ppc64_runlatch_on();
 603                                         process_iSeries_events();
 604                                 }
 605                         }
 606
 607                         HMT_medium();
 608                 }
 609
 610                 ppc64_runlatch_on();
 611                 preempt_enable_no_resched();
 612                 schedule();
 613                 preempt_disable();
 614         }
 615 }
 616
 617 #ifndef CONFIG_PCI
 618 void __init iSeries_init_IRQ(void) { }
 619 #endif
 620
 621 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
 622                                      unsigned long flags)
 623 {
 624         return (void __iomem *)address;
 625 }
 626
 627 static void iseries_iounmap(volatile void __iomem *token)
 628 {
 629 }
 630
 631 /*
 632  * iSeries has no legacy IO, anything calling this function has to
 633  * fail or bad things will happen
 634  */
 635 static int iseries_check_legacy_ioport(unsigned int baseport)
 636 {
 637         return -ENODEV;
 638 }
 639
 640 static int __init iseries_probe(void)
 641 {
 642         unsigned long root = of_get_flat_dt_root();
 643         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 644                 return 0;
 645
 646         hpte_init_iSeries();
 647         /* iSeries does not support 16M pages */
 648         cur_cpu_spec->cpu_features &= ~CPU_FTR_16M_PAGE;
 649
 650         return 1;
 651 }
 652
 653 define_machine(iseries) {
 654         .name           = "iSeries",
 655         .setup_arch     = iSeries_setup_arch,
 656         .show_cpuinfo   = iSeries_show_cpuinfo,
 657         .init_IRQ       = iSeries_init_IRQ,
 658         .get_irq        = iSeries_get_irq,
 659         .init_early     = iSeries_init_early,
 660         .pcibios_fixup  = iSeries_pci_final_fixup,
 661         .restart        = mf_reboot,
 662         .power_off      = mf_power_off,
 663         .halt           = mf_power_off,
 664         .get_boot_time  = iSeries_get_boot_time,
 665         .set_rtc_time   = iSeries_set_rtc_time,
 666         .get_rtc_time   = iSeries_get_rtc_time,
 667         .calibrate_decr = generic_calibrate_decr,
 668         .progress       = iSeries_progress,
 669         .probe          = iseries_probe,
 670         .check_legacy_ioport    = iseries_check_legacy_ioport,
 671         .ioremap        = iseries_ioremap,
 672         .iounmap        = iseries_iounmap,
 673         /* XXX Implement enable_pmcs for iSeries */
 674 };
 675
 676 void * __init iSeries_early_setup(void)
 677 {
 678         unsigned long phys_mem_size;
 679
 680         /* Identify CPU type. This is done again by the common code later
 681          * on but calling this function multiple times is fine.
 682          */
 683         identify_cpu(0, mfspr(SPRN_PVR));
 684
 685         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 686         powerpc_firmware_features |= FW_FEATURE_LPAR;
 687
 688         iSeries_fixup_klimit();
 689
 690         /*
 691          * Initialize the table which translate Linux physical addresses to
 692          * AS/400 absolute addresses
 693          */
 694         phys_mem_size = build_iSeries_Memory_Map();
 695
 696         iSeries_get_cmdline();
 697
 698         return (void *) __pa(build_flat_dt(phys_mem_size));
 699 }
 700
 701 static void hvputc(char c)
 702 {
 703         if (c == '\n')
 704                 hvputc('\r');
 705
 706         HvCall_writeLogBuffer(&c, 1);
 707 }
 708
 709 void __init udbg_init_iseries(void)
 710 {
 711         udbg_putc = hvputc;
 712 }