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/export.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/kdev_t.h>
  27 #include <linux/kexec.h>
  28 #include <linux/major.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/kernel.h>
  31 #include <linux/hrtimer.h>
  32 #include <linux/tick.h>
  33
  34 #include <asm/processor.h>
  35 #include <asm/machdep.h>
  36 #include <asm/page.h>
  37 #include <asm/mmu.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/mmu_context.h>
  40 #include <asm/cputable.h>
  41 #include <asm/sections.h>
  42 #include <asm/iommu.h>
  43 #include <asm/firmware.h>
  44 #include <asm/system.h>
  45 #include <asm/time.h>
  46 #include <asm/paca.h>
  47 #include <asm/cache.h>
  48 #include <asm/abs_addr.h>
  49 #include <asm/iseries/hv_lp_config.h>
  50 #include <asm/iseries/hv_call_event.h>
  51 #include <asm/iseries/hv_call_xm.h>
  52 #include <asm/iseries/it_lp_queue.h>
  53 #include <asm/iseries/mf.h>
  54 #include <asm/iseries/hv_lp_event.h>
  55 #include <asm/iseries/lpar_map.h>
  56 #include <asm/udbg.h>
  57 #include <asm/irq.h>
  58
  59 #include "naca.h"
  60 #include "setup.h"
  61 #include "irq.h"
  62 #include "vpd_areas.h"
  63 #include "processor_vpd.h"
  64 #include "it_lp_naca.h"
  65 #include "main_store.h"
  66 #include "call_sm.h"
  67 #include "call_hpt.h"
  68 #include "pci.h"
  69
  70 #ifdef DEBUG
  71 #define DBG(fmt...) udbg_printf(fmt)
  72 #else
  73 #define DBG(fmt...)
  74 #endif
  75
  76 /* Function Prototypes */
  77 static unsigned long build_iSeries_Memory_Map(void);
  78 static void iseries_shared_idle(void);
  79 static void iseries_dedicated_idle(void);
  80
  81
  82 struct MemoryBlock {
  83         unsigned long absStart;
  84         unsigned long absEnd;
  85         unsigned long logicalStart;
  86         unsigned long logicalEnd;
  87 };
  88
  89 /*
  90  * Process the main store vpd to determine where the holes in memory are
  91  * and return the number of physical blocks and fill in the array of
  92  * block data.
  93  */
  94 static unsigned long iSeries_process_Condor_mainstore_vpd(
  95                 struct MemoryBlock *mb_array, unsigned long max_entries)
  96 {
  97         unsigned long holeFirstChunk, holeSizeChunks;
  98         unsigned long numMemoryBlocks = 1;
  99         struct IoHriMainStoreSegment4 *msVpd =
 100                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 101         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 102         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 103         unsigned long holeSize = holeEnd - holeStart;
 104
 105         printk("Mainstore_VPD: Condor\n");
 106         /*
 107          * Determine if absolute memory has any
 108          * holes so that we can interpret the
 109          * access map we get back from the hypervisor
 110          * correctly.
 111          */
 112         mb_array[0].logicalStart = 0;
 113         mb_array[0].logicalEnd = 0x100000000UL;
 114         mb_array[0].absStart = 0;
 115         mb_array[0].absEnd = 0x100000000UL;
 116
 117         if (holeSize) {
 118                 numMemoryBlocks = 2;
 119                 holeStart = holeStart & 0x000fffffffffffffUL;
 120                 holeStart = addr_to_chunk(holeStart);
 121                 holeFirstChunk = holeStart;
 122                 holeSize = addr_to_chunk(holeSize);
 123                 holeSizeChunks = holeSize;
 124                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 125                                 holeFirstChunk, holeSizeChunks );
 126                 mb_array[0].logicalEnd = holeFirstChunk;
 127                 mb_array[0].absEnd = holeFirstChunk;
 128                 mb_array[1].logicalStart = holeFirstChunk;
 129                 mb_array[1].logicalEnd = 0x100000000UL - holeSizeChunks;
 130                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 131                 mb_array[1].absEnd = 0x100000000UL;
 132         }
 133         return numMemoryBlocks;
 134 }
 135
 136 #define MaxSegmentAreas                 32
 137 #define MaxSegmentAdrRangeBlocks        128
 138 #define MaxAreaRangeBlocks              4
 139
 140 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 141                 struct MemoryBlock *mb_array, unsigned long max_entries)
 142 {
 143         struct IoHriMainStoreSegment5 *msVpdP =
 144                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 145         unsigned long numSegmentBlocks = 0;
 146         u32 existsBits = msVpdP->msAreaExists;
 147         unsigned long area_num;
 148
 149         printk("Mainstore_VPD: Regatta\n");
 150
 151         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 152                 unsigned long numAreaBlocks;
 153                 struct IoHriMainStoreArea4 *currentArea;
 154
 155                 if (existsBits & 0x80000000) {
 156                         unsigned long block_num;
 157
 158                         currentArea = &msVpdP->msAreaArray[area_num];
 159                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 160                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 161                                         area_num, numAreaBlocks);
 162                         for (block_num = 0; block_num < numAreaBlocks;
 163                                         ++block_num ) {
 164                                 /* Process an address range block */
 165                                 struct MemoryBlock tempBlock;
 166                                 unsigned long i;
 167
 168                                 tempBlock.absStart =
 169                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 170                                 tempBlock.absEnd =
 171                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 172                                 tempBlock.logicalStart = 0;
 173                                 tempBlock.logicalEnd   = 0;
 174                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 175                                                 block_num, tempBlock.absStart,
 176                                                 tempBlock.absEnd);
 177
 178                                 for (i = 0; i < numSegmentBlocks; ++i) {
 179                                         if (mb_array[i].absStart ==
 180                                                         tempBlock.absStart)
 181                                                 break;
 182                                 }
 183                                 if (i == numSegmentBlocks) {
 184                                         if (numSegmentBlocks == max_entries)
 185                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 186                                         mb_array[numSegmentBlocks] = tempBlock;
 187                                         ++numSegmentBlocks;
 188                                 } else
 189                                         printk(" (duplicate)");
 190                         }
 191                         printk("\n");
 192                 }
 193                 existsBits <<= 1;
 194         }
 195         /* Now sort the blocks found into ascending sequence */
 196         if (numSegmentBlocks > 1) {
 197                 unsigned long m, n;
 198
 199                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 200                         for (n = numSegmentBlocks - 1; m < n; --n) {
 201                                 if (mb_array[n].absStart <
 202                                                 mb_array[n-1].absStart) {
 203                                         struct MemoryBlock tempBlock;
 204
 205                                         tempBlock = mb_array[n];
 206                                         mb_array[n] = mb_array[n-1];
 207                                         mb_array[n-1] = tempBlock;
 208                                 }
 209                         }
 210                 }
 211         }
 212         /*
 213          * Assign "logical" addresses to each block.  These
 214          * addresses correspond to the hypervisor "bitmap" space.
 215          * Convert all addresses into units of 256K chunks.
 216          */
 217         {
 218         unsigned long i, nextBitmapAddress;
 219
 220         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 221         nextBitmapAddress = 0;
 222         for (i = 0; i < numSegmentBlocks; ++i) {
 223                 unsigned long length = mb_array[i].absEnd -
 224                         mb_array[i].absStart;
 225
 226                 mb_array[i].logicalStart = nextBitmapAddress;
 227                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 228                 nextBitmapAddress += length;
 229                 printk("          Bitmap range: %016lx - %016lx\n"
 230                                 "        Absolute range: %016lx - %016lx\n",
 231                                 mb_array[i].logicalStart,
 232                                 mb_array[i].logicalEnd,
 233                                 mb_array[i].absStart, mb_array[i].absEnd);
 234                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 235                                 0x000fffffffffffffUL);
 236                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 237                                 0x000fffffffffffffUL);
 238                 mb_array[i].logicalStart =
 239                         addr_to_chunk(mb_array[i].logicalStart);
 240                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 241         }
 242         }
 243
 244         return numSegmentBlocks;
 245 }
 246
 247 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 248                 unsigned long max_entries)
 249 {
 250         unsigned long i;
 251         unsigned long mem_blocks = 0;
 252
 253         if (mmu_has_feature(MMU_FTR_SLB))
 254                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 255                                 max_entries);
 256         else
 257                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 258                                 max_entries);
 259
 260         printk("Mainstore_VPD: numMemoryBlocks = %ld\n", mem_blocks);
 261         for (i = 0; i < mem_blocks; ++i) {
 262                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 263                        "                             abs chunks %016lx - %016lx\n",
 264                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 265                         mb_array[i].absStart, mb_array[i].absEnd);
 266         }
 267         return mem_blocks;
 268 }
 269
 270 static void __init iSeries_get_cmdline(void)
 271 {
 272         char *p, *q;
 273
 274         /* copy the command line parameter from the primary VSP  */
 275         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 276                         HvLpDma_Direction_RemoteToLocal);
 277
 278         p = cmd_line;
 279         q = cmd_line + 255;
 280         while(p < q) {
 281                 if (!*p || *p == '\n')
 282                         break;
 283                 ++p;
 284         }
 285         *p = 0;
 286 }
 287
 288 static void __init iSeries_init_early(void)
 289 {
 290         DBG(" -> iSeries_init_early()\n");
 291
 292         /* Snapshot the timebase, for use in later recalibration */
 293         iSeries_time_init_early();
 294
 295         /*
 296          * Initialize the DMA/TCE management
 297          */
 298         iommu_init_early_iSeries();
 299
 300         /* Initialize machine-dependency vectors */
 301 #ifdef CONFIG_SMP
 302         smp_init_iSeries();
 303 #endif
 304
 305         /* Associate Lp Event Queue 0 with processor 0 */
 306         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 307
 308         mf_init();
 309
 310         DBG(" <- iSeries_init_early()\n");
 311 }
 312
 313 struct mschunks_map mschunks_map = {
 314         /* XXX We don't use these, but Piranha might need them. */
 315         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 316         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 317         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 318 };
 319 EXPORT_SYMBOL(mschunks_map);
 320
 321 static void mschunks_alloc(unsigned long num_chunks)
 322 {
 323         klimit = _ALIGN(klimit, sizeof(u32));
 324         mschunks_map.mapping = (u32 *)klimit;
 325         klimit += num_chunks * sizeof(u32);
 326         mschunks_map.num_chunks = num_chunks;
 327 }
 328
 329 /*
 330  * The iSeries may have very large memories ( > 128 GB ) and a partition
 331  * may get memory in "chunks" that may be anywhere in the 2**52 real
 332  * address space.  The chunks are 256K in size.  To map this to the
 333  * memory model Linux expects, the AS/400 specific code builds a
 334  * translation table to translate what Linux thinks are "physical"
 335  * addresses to the actual real addresses.  This allows us to make
 336  * it appear to Linux that we have contiguous memory starting at
 337  * physical address zero while in fact this could be far from the truth.
 338  * To avoid confusion, I'll let the words physical and/or real address
 339  * apply to the Linux addresses while I'll use "absolute address" to
 340  * refer to the actual hardware real address.
 341  *
 342  * build_iSeries_Memory_Map gets information from the Hypervisor and
 343  * looks at the Main Store VPD to determine the absolute addresses
 344  * of the memory that has been assigned to our partition and builds
 345  * a table used to translate Linux's physical addresses to these
 346  * absolute addresses.  Absolute addresses are needed when
 347  * communicating with the hypervisor (e.g. to build HPT entries)
 348  *
 349  * Returns the physical memory size
 350  */
 351
 352 static unsigned long __init build_iSeries_Memory_Map(void)
 353 {
 354         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 355         u32 nextPhysChunk;
 356         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 357         u32 totalChunks,moreChunks;
 358         u32 currChunk, thisChunk, absChunk;
 359         u32 currDword;
 360         u32 chunkBit;
 361         u64 map;
 362         struct MemoryBlock mb[32];
 363         unsigned long numMemoryBlocks, curBlock;
 364
 365         /* Chunk size on iSeries is 256K bytes */
 366         totalChunks = (u32)HvLpConfig_getMsChunks();
 367         mschunks_alloc(totalChunks);
 368
 369         /*
 370          * Get absolute address of our load area
 371          * and map it to physical address 0
 372          * This guarantees that the loadarea ends up at physical 0
 373          * otherwise, it might not be returned by PLIC as the first
 374          * chunks
 375          */
 376
 377         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 378         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 379
 380         /*
 381          * Only add the pages already mapped here.
 382          * Otherwise we might add the hpt pages
 383          * The rest of the pages of the load area
 384          * aren't in the HPT yet and can still
 385          * be assigned an arbitrary physical address
 386          */
 387         if ((loadAreaSize * 64) > HvPagesToMap)
 388                 loadAreaSize = HvPagesToMap / 64;
 389
 390         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 391
 392         /*
 393          * TODO Do we need to do something if the HPT is in the 64MB load area?
 394          * This would be required if the itLpNaca.xLoadAreaChunks includes
 395          * the HPT size
 396          */
 397
 398         printk("Mapping load area - physical addr = 0000000000000000\n"
 399                 "                    absolute addr = %016lx\n",
 400                 chunk_to_addr(loadAreaFirstChunk));
 401         printk("Load area size %dK\n", loadAreaSize * 256);
 402
 403         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 404                 mschunks_map.mapping[nextPhysChunk] =
 405                         loadAreaFirstChunk + nextPhysChunk;
 406
 407         /*
 408          * Get absolute address of our HPT and remember it so
 409          * we won't map it to any physical address
 410          */
 411         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 412         hptSizePages = (u32)HvCallHpt_getHptPages();
 413         hptSizeChunks = hptSizePages >>
 414                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 415         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 416
 417         printk("HPT absolute addr = %016lx, size = %dK\n",
 418                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 419
 420         /*
 421          * Determine if absolute memory has any
 422          * holes so that we can interpret the
 423          * access map we get back from the hypervisor
 424          * correctly.
 425          */
 426         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 427
 428         /*
 429          * Process the main store access map from the hypervisor
 430          * to build up our physical -> absolute translation table
 431          */
 432         curBlock = 0;
 433         currChunk = 0;
 434         currDword = 0;
 435         moreChunks = totalChunks;
 436
 437         while (moreChunks) {
 438                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 439                                 currDword);
 440                 thisChunk = currChunk;
 441                 while (map) {
 442                         chunkBit = map >> 63;
 443                         map <<= 1;
 444                         if (chunkBit) {
 445                                 --moreChunks;
 446                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 447                                         ++curBlock;
 448                                         if (curBlock >= numMemoryBlocks)
 449                                                 panic("out of memory blocks");
 450                                 }
 451                                 if (thisChunk < mb[curBlock].logicalStart)
 452                                         panic("memory block error");
 453
 454                                 absChunk = mb[curBlock].absStart +
 455                                         (thisChunk - mb[curBlock].logicalStart);
 456                                 if (((absChunk < hptFirstChunk) ||
 457                                      (absChunk > hptLastChunk)) &&
 458                                     ((absChunk < loadAreaFirstChunk) ||
 459                                      (absChunk > loadAreaLastChunk))) {
 460                                         mschunks_map.mapping[nextPhysChunk] =
 461                                                 absChunk;
 462                                         ++nextPhysChunk;
 463                                 }
 464                         }
 465                         ++thisChunk;
 466                 }
 467                 ++currDword;
 468                 currChunk += 64;
 469         }
 470
 471         /*
 472          * main store size (in chunks) is
 473          *   totalChunks - hptSizeChunks
 474          * which should be equal to
 475          *   nextPhysChunk
 476          */
 477         return chunk_to_addr(nextPhysChunk);
 478 }
 479
 480 /*
 481  * Document me.
 482  */
 483 static void __init iSeries_setup_arch(void)
 484 {
 485         if (get_lppaca()->shared_proc) {
 486                 ppc_md.idle_loop = iseries_shared_idle;
 487                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 488         } else {
 489                 ppc_md.idle_loop = iseries_dedicated_idle;
 490                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 491         }
 492
 493         /* Setup the Lp Event Queue */
 494         setup_hvlpevent_queue();
 495
 496         printk("Max  logical processors = %d\n",
 497                         itVpdAreas.xSlicMaxLogicalProcs);
 498         printk("Max physical processors = %d\n",
 499                         itVpdAreas.xSlicMaxPhysicalProcs);
 500
 501         iSeries_pcibios_init();
 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(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                 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(1);
 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, void *caller)
 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->mmu_features &= ~MMU_FTR_16M_PAGE;
 639
 640         return 1;
 641 }
 642
 643 #ifdef CONFIG_KEXEC
 644 static int iseries_kexec_prepare(struct kimage *image)
 645 {
 646         return -ENOSYS;
 647 }
 648 #endif
 649
 650 define_machine(iseries) {
 651         .name                   = "iSeries",
 652         .setup_arch             = iSeries_setup_arch,
 653         .show_cpuinfo           = iSeries_show_cpuinfo,
 654         .init_IRQ               = iSeries_init_IRQ,
 655         .get_irq                = iSeries_get_irq,
 656         .init_early             = iSeries_init_early,
 657         .pcibios_fixup          = iSeries_pci_final_fixup,
 658         .pcibios_fixup_resources= iSeries_pcibios_fixup_resources,
 659         .restart                = mf_reboot,
 660         .power_off              = mf_power_off,
 661         .halt                   = mf_power_off,
 662         .get_boot_time          = iSeries_get_boot_time,
 663         .set_rtc_time           = iSeries_set_rtc_time,
 664         .get_rtc_time           = iSeries_get_rtc_time,
 665         .calibrate_decr         = generic_calibrate_decr,
 666         .progress               = iSeries_progress,
 667         .probe                  = iseries_probe,
 668         .ioremap                = iseries_ioremap,
 669         .iounmap                = iseries_iounmap,
 670 #ifdef CONFIG_KEXEC
 671         .machine_kexec_prepare  = iseries_kexec_prepare,
 672 #endif
 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         initialise_paca(&boot_paca, 0);
 685
 686         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 687         powerpc_firmware_features |= FW_FEATURE_LPAR;
 688
 689 #ifdef CONFIG_SMP
 690         /* On iSeries we know we can never have more than 64 cpus */
 691         nr_cpu_ids = max(nr_cpu_ids, 64);
 692 #endif
 693
 694         iSeries_fixup_klimit();
 695
 696         /*
 697          * Initialize the table which translate Linux physical addresses to
 698          * AS/400 absolute addresses
 699          */
 700         phys_mem_size = build_iSeries_Memory_Map();
 701
 702         iSeries_get_cmdline();
 703
 704         return (void *) __pa(build_flat_dt(phys_mem_size));
 705 }
 706
 707 static void hvputc(char c)
 708 {
 709         if (c == '\n')
 710                 hvputc('\r');
 711
 712         HvCall_writeLogBuffer(&c, 1);
 713 }
 714
 715 void __init udbg_init_iseries(void)
 716 {
 717         udbg_putc = hvputc;
 718 }