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/initrd.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/kdev_t.h>
  27 #include <linux/major.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/kernel.h>
  30
  31 #include <asm/processor.h>
  32 #include <asm/machdep.h>
  33 #include <asm/page.h>
  34 #include <asm/mmu.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/mmu_context.h>
  37 #include <asm/cputable.h>
  38 #include <asm/sections.h>
  39 #include <asm/iommu.h>
  40 #include <asm/firmware.h>
  41 #include <asm/system.h>
  42 #include <asm/time.h>
  43 #include <asm/paca.h>
  44 #include <asm/cache.h>
  45 #include <asm/sections.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 "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 int rd_size;             /* Defined in drivers/block/rd.c */
  83
  84 extern unsigned long iSeries_recal_tb;
  85 extern unsigned long iSeries_recal_titan;
  86
  87 struct MemoryBlock {
  88         unsigned long absStart;
  89         unsigned long absEnd;
  90         unsigned long logicalStart;
  91         unsigned long logicalEnd;
  92 };
  93
  94 /*
  95  * Process the main store vpd to determine where the holes in memory are
  96  * and return the number of physical blocks and fill in the array of
  97  * block data.
  98  */
  99 static unsigned long iSeries_process_Condor_mainstore_vpd(
 100                 struct MemoryBlock *mb_array, unsigned long max_entries)
 101 {
 102         unsigned long holeFirstChunk, holeSizeChunks;
 103         unsigned long numMemoryBlocks = 1;
 104         struct IoHriMainStoreSegment4 *msVpd =
 105                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 106         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 107         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 108         unsigned long holeSize = holeEnd - holeStart;
 109
 110         printk("Mainstore_VPD: Condor\n");
 111         /*
 112          * Determine if absolute memory has any
 113          * holes so that we can interpret the
 114          * access map we get back from the hypervisor
 115          * correctly.
 116          */
 117         mb_array[0].logicalStart = 0;
 118         mb_array[0].logicalEnd = 0x100000000;
 119         mb_array[0].absStart = 0;
 120         mb_array[0].absEnd = 0x100000000;
 121
 122         if (holeSize) {
 123                 numMemoryBlocks = 2;
 124                 holeStart = holeStart & 0x000fffffffffffff;
 125                 holeStart = addr_to_chunk(holeStart);
 126                 holeFirstChunk = holeStart;
 127                 holeSize = addr_to_chunk(holeSize);
 128                 holeSizeChunks = holeSize;
 129                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 130                                 holeFirstChunk, holeSizeChunks );
 131                 mb_array[0].logicalEnd = holeFirstChunk;
 132                 mb_array[0].absEnd = holeFirstChunk;
 133                 mb_array[1].logicalStart = holeFirstChunk;
 134                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 135                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 136                 mb_array[1].absEnd = 0x100000000;
 137         }
 138         return numMemoryBlocks;
 139 }
 140
 141 #define MaxSegmentAreas                 32
 142 #define MaxSegmentAdrRangeBlocks        128
 143 #define MaxAreaRangeBlocks              4
 144
 145 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 146                 struct MemoryBlock *mb_array, unsigned long max_entries)
 147 {
 148         struct IoHriMainStoreSegment5 *msVpdP =
 149                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 150         unsigned long numSegmentBlocks = 0;
 151         u32 existsBits = msVpdP->msAreaExists;
 152         unsigned long area_num;
 153
 154         printk("Mainstore_VPD: Regatta\n");
 155
 156         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 157                 unsigned long numAreaBlocks;
 158                 struct IoHriMainStoreArea4 *currentArea;
 159
 160                 if (existsBits & 0x80000000) {
 161                         unsigned long block_num;
 162
 163                         currentArea = &msVpdP->msAreaArray[area_num];
 164                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 165                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 166                                         area_num, numAreaBlocks);
 167                         for (block_num = 0; block_num < numAreaBlocks;
 168                                         ++block_num ) {
 169                                 /* Process an address range block */
 170                                 struct MemoryBlock tempBlock;
 171                                 unsigned long i;
 172
 173                                 tempBlock.absStart =
 174                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 175                                 tempBlock.absEnd =
 176                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 177                                 tempBlock.logicalStart = 0;
 178                                 tempBlock.logicalEnd   = 0;
 179                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 180                                                 block_num, tempBlock.absStart,
 181                                                 tempBlock.absEnd);
 182
 183                                 for (i = 0; i < numSegmentBlocks; ++i) {
 184                                         if (mb_array[i].absStart ==
 185                                                         tempBlock.absStart)
 186                                                 break;
 187                                 }
 188                                 if (i == numSegmentBlocks) {
 189                                         if (numSegmentBlocks == max_entries)
 190                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 191                                         mb_array[numSegmentBlocks] = tempBlock;
 192                                         ++numSegmentBlocks;
 193                                 } else
 194                                         printk(" (duplicate)");
 195                         }
 196                         printk("\n");
 197                 }
 198                 existsBits <<= 1;
 199         }
 200         /* Now sort the blocks found into ascending sequence */
 201         if (numSegmentBlocks > 1) {
 202                 unsigned long m, n;
 203
 204                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 205                         for (n = numSegmentBlocks - 1; m < n; --n) {
 206                                 if (mb_array[n].absStart <
 207                                                 mb_array[n-1].absStart) {
 208                                         struct MemoryBlock tempBlock;
 209
 210                                         tempBlock = mb_array[n];
 211                                         mb_array[n] = mb_array[n-1];
 212                                         mb_array[n-1] = tempBlock;
 213                                 }
 214                         }
 215                 }
 216         }
 217         /*
 218          * Assign "logical" addresses to each block.  These
 219          * addresses correspond to the hypervisor "bitmap" space.
 220          * Convert all addresses into units of 256K chunks.
 221          */
 222         {
 223         unsigned long i, nextBitmapAddress;
 224
 225         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 226         nextBitmapAddress = 0;
 227         for (i = 0; i < numSegmentBlocks; ++i) {
 228                 unsigned long length = mb_array[i].absEnd -
 229                         mb_array[i].absStart;
 230
 231                 mb_array[i].logicalStart = nextBitmapAddress;
 232                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 233                 nextBitmapAddress += length;
 234                 printk("          Bitmap range: %016lx - %016lx\n"
 235                                 "        Absolute range: %016lx - %016lx\n",
 236                                 mb_array[i].logicalStart,
 237                                 mb_array[i].logicalEnd,
 238                                 mb_array[i].absStart, mb_array[i].absEnd);
 239                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 240                                 0x000fffffffffffff);
 241                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 242                                 0x000fffffffffffff);
 243                 mb_array[i].logicalStart =
 244                         addr_to_chunk(mb_array[i].logicalStart);
 245                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 246         }
 247         }
 248
 249         return numSegmentBlocks;
 250 }
 251
 252 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 253                 unsigned long max_entries)
 254 {
 255         unsigned long i;
 256         unsigned long mem_blocks = 0;
 257
 258         if (cpu_has_feature(CPU_FTR_SLB))
 259                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 260                                 max_entries);
 261         else
 262                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 263                                 max_entries);
 264
 265         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 266         for (i = 0; i < mem_blocks; ++i) {
 267                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 268                        "                             abs chunks %016lx - %016lx\n",
 269                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 270                         mb_array[i].absStart, mb_array[i].absEnd);
 271         }
 272         return mem_blocks;
 273 }
 274
 275 static void __init iSeries_get_cmdline(void)
 276 {
 277         char *p, *q;
 278
 279         /* copy the command line parameter from the primary VSP  */
 280         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 281                         HvLpDma_Direction_RemoteToLocal);
 282
 283         p = cmd_line;
 284         q = cmd_line + 255;
 285         while(p < q) {
 286                 if (!*p || *p == '\n')
 287                         break;
 288                 ++p;
 289         }
 290         *p = 0;
 291 }
 292
 293 static void __init iSeries_init_early(void)
 294 {
 295         DBG(" -> iSeries_init_early()\n");
 296
 297         ppc64_interrupt_controller = IC_ISERIES;
 298
 299 #if defined(CONFIG_BLK_DEV_INITRD)
 300         /*
 301          * If the init RAM disk has been configured and there is
 302          * a non-zero starting address for it, set it up
 303          */
 304         if (naca.xRamDisk) {
 305                 initrd_start = (unsigned long)__va(naca.xRamDisk);
 306                 initrd_end = initrd_start + naca.xRamDiskSize * HW_PAGE_SIZE;
 307                 initrd_below_start_ok = 1;      // ramdisk in kernel space
 308                 ROOT_DEV = Root_RAM0;
 309                 if (((rd_size * 1024) / HW_PAGE_SIZE) < naca.xRamDiskSize)
 310                         rd_size = (naca.xRamDiskSize * HW_PAGE_SIZE) / 1024;
 311         } else
 312 #endif /* CONFIG_BLK_DEV_INITRD */
 313         {
 314             /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
 315         }
 316
 317         iSeries_recal_tb = get_tb();
 318         iSeries_recal_titan = HvCallXm_loadTod();
 319
 320         /*
 321          * Initialize the DMA/TCE management
 322          */
 323         iommu_init_early_iSeries();
 324
 325         /* Initialize machine-dependency vectors */
 326 #ifdef CONFIG_SMP
 327         smp_init_iSeries();
 328 #endif
 329
 330         /* Associate Lp Event Queue 0 with processor 0 */
 331         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 332
 333         mf_init();
 334
 335         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 336          * look sensible. If not, clear initrd reference.
 337          */
 338 #ifdef CONFIG_BLK_DEV_INITRD
 339         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 340             initrd_end > initrd_start)
 341                 ROOT_DEV = Root_RAM0;
 342         else
 343                 initrd_start = initrd_end = 0;
 344 #endif /* CONFIG_BLK_DEV_INITRD */
 345
 346         DBG(" <- iSeries_init_early()\n");
 347 }
 348
 349 struct mschunks_map mschunks_map = {
 350         /* XXX We don't use these, but Piranha might need them. */
 351         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 352         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 353         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 354 };
 355 EXPORT_SYMBOL(mschunks_map);
 356
 357 void mschunks_alloc(unsigned long num_chunks)
 358 {
 359         klimit = _ALIGN(klimit, sizeof(u32));
 360         mschunks_map.mapping = (u32 *)klimit;
 361         klimit += num_chunks * sizeof(u32);
 362         mschunks_map.num_chunks = num_chunks;
 363 }
 364
 365 /*
 366  * The iSeries may have very large memories ( > 128 GB ) and a partition
 367  * may get memory in "chunks" that may be anywhere in the 2**52 real
 368  * address space.  The chunks are 256K in size.  To map this to the
 369  * memory model Linux expects, the AS/400 specific code builds a
 370  * translation table to translate what Linux thinks are "physical"
 371  * addresses to the actual real addresses.  This allows us to make
 372  * it appear to Linux that we have contiguous memory starting at
 373  * physical address zero while in fact this could be far from the truth.
 374  * To avoid confusion, I'll let the words physical and/or real address
 375  * apply to the Linux addresses while I'll use "absolute address" to
 376  * refer to the actual hardware real address.
 377  *
 378  * build_iSeries_Memory_Map gets information from the Hypervisor and
 379  * looks at the Main Store VPD to determine the absolute addresses
 380  * of the memory that has been assigned to our partition and builds
 381  * a table used to translate Linux's physical addresses to these
 382  * absolute addresses.  Absolute addresses are needed when
 383  * communicating with the hypervisor (e.g. to build HPT entries)
 384  *
 385  * Returns the physical memory size
 386  */
 387
 388 static unsigned long __init build_iSeries_Memory_Map(void)
 389 {
 390         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 391         u32 nextPhysChunk;
 392         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 393         u32 totalChunks,moreChunks;
 394         u32 currChunk, thisChunk, absChunk;
 395         u32 currDword;
 396         u32 chunkBit;
 397         u64 map;
 398         struct MemoryBlock mb[32];
 399         unsigned long numMemoryBlocks, curBlock;
 400
 401         /* Chunk size on iSeries is 256K bytes */
 402         totalChunks = (u32)HvLpConfig_getMsChunks();
 403         mschunks_alloc(totalChunks);
 404
 405         /*
 406          * Get absolute address of our load area
 407          * and map it to physical address 0
 408          * This guarantees that the loadarea ends up at physical 0
 409          * otherwise, it might not be returned by PLIC as the first
 410          * chunks
 411          */
 412
 413         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 414         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 415
 416         /*
 417          * Only add the pages already mapped here.
 418          * Otherwise we might add the hpt pages
 419          * The rest of the pages of the load area
 420          * aren't in the HPT yet and can still
 421          * be assigned an arbitrary physical address
 422          */
 423         if ((loadAreaSize * 64) > HvPagesToMap)
 424                 loadAreaSize = HvPagesToMap / 64;
 425
 426         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 427
 428         /*
 429          * TODO Do we need to do something if the HPT is in the 64MB load area?
 430          * This would be required if the itLpNaca.xLoadAreaChunks includes
 431          * the HPT size
 432          */
 433
 434         printk("Mapping load area - physical addr = 0000000000000000\n"
 435                 "                    absolute addr = %016lx\n",
 436                 chunk_to_addr(loadAreaFirstChunk));
 437         printk("Load area size %dK\n", loadAreaSize * 256);
 438
 439         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 440                 mschunks_map.mapping[nextPhysChunk] =
 441                         loadAreaFirstChunk + nextPhysChunk;
 442
 443         /*
 444          * Get absolute address of our HPT and remember it so
 445          * we won't map it to any physical address
 446          */
 447         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 448         hptSizePages = (u32)HvCallHpt_getHptPages();
 449         hptSizeChunks = hptSizePages >>
 450                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 451         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 452
 453         printk("HPT absolute addr = %016lx, size = %dK\n",
 454                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 455
 456         /*
 457          * Determine if absolute memory has any
 458          * holes so that we can interpret the
 459          * access map we get back from the hypervisor
 460          * correctly.
 461          */
 462         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 463
 464         /*
 465          * Process the main store access map from the hypervisor
 466          * to build up our physical -> absolute translation table
 467          */
 468         curBlock = 0;
 469         currChunk = 0;
 470         currDword = 0;
 471         moreChunks = totalChunks;
 472
 473         while (moreChunks) {
 474                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 475                                 currDword);
 476                 thisChunk = currChunk;
 477                 while (map) {
 478                         chunkBit = map >> 63;
 479                         map <<= 1;
 480                         if (chunkBit) {
 481                                 --moreChunks;
 482                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 483                                         ++curBlock;
 484                                         if (curBlock >= numMemoryBlocks)
 485                                                 panic("out of memory blocks");
 486                                 }
 487                                 if (thisChunk < mb[curBlock].logicalStart)
 488                                         panic("memory block error");
 489
 490                                 absChunk = mb[curBlock].absStart +
 491                                         (thisChunk - mb[curBlock].logicalStart);
 492                                 if (((absChunk < hptFirstChunk) ||
 493                                      (absChunk > hptLastChunk)) &&
 494                                     ((absChunk < loadAreaFirstChunk) ||
 495                                      (absChunk > loadAreaLastChunk))) {
 496                                         mschunks_map.mapping[nextPhysChunk] =
 497                                                 absChunk;
 498                                         ++nextPhysChunk;
 499                                 }
 500                         }
 501                         ++thisChunk;
 502                 }
 503                 ++currDword;
 504                 currChunk += 64;
 505         }
 506
 507         /*
 508          * main store size (in chunks) is
 509          *   totalChunks - hptSizeChunks
 510          * which should be equal to
 511          *   nextPhysChunk
 512          */
 513         return chunk_to_addr(nextPhysChunk);
 514 }
 515
 516 /*
 517  * Document me.
 518  */
 519 static void __init iSeries_setup_arch(void)
 520 {
 521         if (get_lppaca()->shared_proc) {
 522                 ppc_md.idle_loop = iseries_shared_idle;
 523                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 524         } else {
 525                 ppc_md.idle_loop = iseries_dedicated_idle;
 526                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 527         }
 528
 529         /* Setup the Lp Event Queue */
 530         setup_hvlpevent_queue();
 531
 532         printk("Max  logical processors = %d\n",
 533                         itVpdAreas.xSlicMaxLogicalProcs);
 534         printk("Max physical processors = %d\n",
 535                         itVpdAreas.xSlicMaxPhysicalProcs);
 536 }
 537
 538 static void iSeries_show_cpuinfo(struct seq_file *m)
 539 {
 540         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 541 }
 542
 543 static void __init iSeries_progress(char * st, unsigned short code)
 544 {
 545         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 546         mf_display_progress(code);
 547 }
 548
 549 static void __init iSeries_fixup_klimit(void)
 550 {
 551         /*
 552          * Change klimit to take into account any ram disk
 553          * that may be included
 554          */
 555         if (naca.xRamDisk)
 556                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 557                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 558 }
 559
 560 static int __init iSeries_src_init(void)
 561 {
 562         /* clear the progress line */
 563         ppc_md.progress(" ", 0xffff);
 564         return 0;
 565 }
 566
 567 late_initcall(iSeries_src_init);
 568
 569 static inline void process_iSeries_events(void)
 570 {
 571         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 572 }
 573
 574 static void yield_shared_processor(void)
 575 {
 576         unsigned long tb;
 577
 578         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 579                                     HvCall_MaskLpEvent |
 580                                     HvCall_MaskLpProd |
 581                                     HvCall_MaskTimeout);
 582
 583         tb = get_tb();
 584         /* Compute future tb value when yield should expire */
 585         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 586
 587         /*
 588          * The decrementer stops during the yield.  Force a fake decrementer
 589          * here and let the timer_interrupt code sort out the actual time.
 590          */
 591         get_lppaca()->int_dword.fields.decr_int = 1;
 592         ppc64_runlatch_on();
 593         process_iSeries_events();
 594 }
 595
 596 static void iseries_shared_idle(void)
 597 {
 598         while (1) {
 599                 while (!need_resched() && !hvlpevent_is_pending()) {
 600                         local_irq_disable();
 601                         ppc64_runlatch_off();
 602
 603                         /* Recheck with irqs off */
 604                         if (!need_resched() && !hvlpevent_is_pending())
 605                                 yield_shared_processor();
 606
 607                         HMT_medium();
 608                         local_irq_enable();
 609                 }
 610
 611                 ppc64_runlatch_on();
 612
 613                 if (hvlpevent_is_pending())
 614                         process_iSeries_events();
 615
 616                 preempt_enable_no_resched();
 617                 schedule();
 618                 preempt_disable();
 619         }
 620 }
 621
 622 static void iseries_dedicated_idle(void)
 623 {
 624         set_thread_flag(TIF_POLLING_NRFLAG);
 625
 626         while (1) {
 627                 if (!need_resched()) {
 628                         while (!need_resched()) {
 629                                 ppc64_runlatch_off();
 630                                 HMT_low();
 631
 632                                 if (hvlpevent_is_pending()) {
 633                                         HMT_medium();
 634                                         ppc64_runlatch_on();
 635                                         process_iSeries_events();
 636                                 }
 637                         }
 638
 639                         HMT_medium();
 640                 }
 641
 642                 ppc64_runlatch_on();
 643                 preempt_enable_no_resched();
 644                 schedule();
 645                 preempt_disable();
 646         }
 647 }
 648
 649 #ifndef CONFIG_PCI
 650 void __init iSeries_init_IRQ(void) { }
 651 #endif
 652
 653 static int __init iseries_probe(void)
 654 {
 655         unsigned long root = of_get_flat_dt_root();
 656         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 657                 return 0;
 658
 659         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 660         powerpc_firmware_features |= FW_FEATURE_LPAR;
 661
 662         /*
 663          * The Hypervisor only allows us up to 256 interrupt
 664          * sources (the irq number is passed in a u8).
 665          */
 666         virt_irq_max = 255;
 667
 668         hpte_init_iSeries();
 669
 670         return 1;
 671 }
 672
 673 define_machine(iseries) {
 674         .name           = "iSeries",
 675         .setup_arch     = iSeries_setup_arch,
 676         .show_cpuinfo   = iSeries_show_cpuinfo,
 677         .init_IRQ       = iSeries_init_IRQ,
 678         .get_irq        = iSeries_get_irq,
 679         .init_early     = iSeries_init_early,
 680         .pcibios_fixup  = iSeries_pci_final_fixup,
 681         .restart        = mf_reboot,
 682         .power_off      = mf_power_off,
 683         .halt           = mf_power_off,
 684         .get_boot_time  = iSeries_get_boot_time,
 685         .set_rtc_time   = iSeries_set_rtc_time,
 686         .get_rtc_time   = iSeries_get_rtc_time,
 687         .calibrate_decr = generic_calibrate_decr,
 688         .progress       = iSeries_progress,
 689         .probe          = iseries_probe,
 690         /* XXX Implement enable_pmcs for iSeries */
 691 };
 692
 693 void * __init iSeries_early_setup(void)
 694 {
 695         unsigned long phys_mem_size;
 696
 697         iSeries_fixup_klimit();
 698
 699         /*
 700          * Initialize the table which translate Linux physical addresses to
 701          * AS/400 absolute addresses
 702          */
 703         phys_mem_size = build_iSeries_Memory_Map();
 704
 705         iSeries_get_cmdline();
 706
 707         return (void *) __pa(build_flat_dt(phys_mem_size));
 708 }
 709
 710 static void hvputc(char c)
 711 {
 712         if (c == '\n')
 713                 hvputc('\r');
 714
 715         HvCall_writeLogBuffer(&c, 1);
 716 }
 717
 718 void __init udbg_init_iseries(void)
 719 {
 720         udbg_putc = hvputc;
 721 }