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/config.h>
  20 #include <linux/init.h>
  21 #include <linux/threads.h>
  22 #include <linux/smp.h>
  23 #include <linux/param.h>
  24 #include <linux/string.h>
  25 #include <linux/initrd.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/kdev_t.h>
  28 #include <linux/major.h>
  29 #include <linux/root_dev.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
  42 #include <asm/time.h>
  43 #include <asm/naca.h>
  44 #include <asm/paca.h>
  45 #include <asm/cache.h>
  46 #include <asm/sections.h>
  47 #include <asm/abs_addr.h>
  48 #include <asm/iSeries/HvLpConfig.h>
  49 #include <asm/iSeries/HvCallEvent.h>
  50 #include <asm/iSeries/HvCallXm.h>
  51 #include <asm/iSeries/ItLpQueue.h>
  52 #include <asm/iSeries/mf.h>
  53 #include <asm/iSeries/HvLpEvent.h>
  54 #include <asm/iSeries/LparMap.h>
  55
  56 #include "setup.h"
  57 #include "irq.h"
  58 #include "vpd_areas.h"
  59 #include "processor_vpd.h"
  60 #include "main_store.h"
  61 #include "call_sm.h"
  62 #include "call_hpt.h"
  63
  64 extern void hvlog(char *fmt, ...);
  65
  66 #ifdef DEBUG
  67 #define DBG(fmt...) hvlog(fmt)
  68 #else
  69 #define DBG(fmt...)
  70 #endif
  71
  72 /* Function Prototypes */
  73 extern void ppcdbg_initialize(void);
  74
  75 static void build_iSeries_Memory_Map(void);
  76 static void iseries_shared_idle(void);
  77 static void iseries_dedicated_idle(void);
  78 #ifdef CONFIG_PCI
  79 extern void iSeries_pci_final_fixup(void);
  80 #else
  81 static void iSeries_pci_final_fixup(void) { }
  82 #endif
  83
  84 /* Global Variables */
  85 int piranha_simulator;
  86
  87 extern int rd_size;             /* Defined in drivers/block/rd.c */
  88 extern unsigned long klimit;
  89 extern unsigned long embedded_sysmap_start;
  90 extern unsigned long embedded_sysmap_end;
  91
  92 extern unsigned long iSeries_recal_tb;
  93 extern unsigned long iSeries_recal_titan;
  94
  95 static int mf_initialized;
  96
  97 struct MemoryBlock {
  98         unsigned long absStart;
  99         unsigned long absEnd;
 100         unsigned long logicalStart;
 101         unsigned long logicalEnd;
 102 };
 103
 104 /*
 105  * Process the main store vpd to determine where the holes in memory are
 106  * and return the number of physical blocks and fill in the array of
 107  * block data.
 108  */
 109 static unsigned long iSeries_process_Condor_mainstore_vpd(
 110                 struct MemoryBlock *mb_array, unsigned long max_entries)
 111 {
 112         unsigned long holeFirstChunk, holeSizeChunks;
 113         unsigned long numMemoryBlocks = 1;
 114         struct IoHriMainStoreSegment4 *msVpd =
 115                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 116         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 117         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 118         unsigned long holeSize = holeEnd - holeStart;
 119
 120         printk("Mainstore_VPD: Condor\n");
 121         /*
 122          * Determine if absolute memory has any
 123          * holes so that we can interpret the
 124          * access map we get back from the hypervisor
 125          * correctly.
 126          */
 127         mb_array[0].logicalStart = 0;
 128         mb_array[0].logicalEnd = 0x100000000;
 129         mb_array[0].absStart = 0;
 130         mb_array[0].absEnd = 0x100000000;
 131
 132         if (holeSize) {
 133                 numMemoryBlocks = 2;
 134                 holeStart = holeStart & 0x000fffffffffffff;
 135                 holeStart = addr_to_chunk(holeStart);
 136                 holeFirstChunk = holeStart;
 137                 holeSize = addr_to_chunk(holeSize);
 138                 holeSizeChunks = holeSize;
 139                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 140                                 holeFirstChunk, holeSizeChunks );
 141                 mb_array[0].logicalEnd = holeFirstChunk;
 142                 mb_array[0].absEnd = holeFirstChunk;
 143                 mb_array[1].logicalStart = holeFirstChunk;
 144                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 145                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 146                 mb_array[1].absEnd = 0x100000000;
 147         }
 148         return numMemoryBlocks;
 149 }
 150
 151 #define MaxSegmentAreas                 32
 152 #define MaxSegmentAdrRangeBlocks        128
 153 #define MaxAreaRangeBlocks              4
 154
 155 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 156                 struct MemoryBlock *mb_array, unsigned long max_entries)
 157 {
 158         struct IoHriMainStoreSegment5 *msVpdP =
 159                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 160         unsigned long numSegmentBlocks = 0;
 161         u32 existsBits = msVpdP->msAreaExists;
 162         unsigned long area_num;
 163
 164         printk("Mainstore_VPD: Regatta\n");
 165
 166         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 167                 unsigned long numAreaBlocks;
 168                 struct IoHriMainStoreArea4 *currentArea;
 169
 170                 if (existsBits & 0x80000000) {
 171                         unsigned long block_num;
 172
 173                         currentArea = &msVpdP->msAreaArray[area_num];
 174                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 175                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 176                                         area_num, numAreaBlocks);
 177                         for (block_num = 0; block_num < numAreaBlocks;
 178                                         ++block_num ) {
 179                                 /* Process an address range block */
 180                                 struct MemoryBlock tempBlock;
 181                                 unsigned long i;
 182
 183                                 tempBlock.absStart =
 184                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 185                                 tempBlock.absEnd =
 186                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 187                                 tempBlock.logicalStart = 0;
 188                                 tempBlock.logicalEnd   = 0;
 189                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 190                                                 block_num, tempBlock.absStart,
 191                                                 tempBlock.absEnd);
 192
 193                                 for (i = 0; i < numSegmentBlocks; ++i) {
 194                                         if (mb_array[i].absStart ==
 195                                                         tempBlock.absStart)
 196                                                 break;
 197                                 }
 198                                 if (i == numSegmentBlocks) {
 199                                         if (numSegmentBlocks == max_entries)
 200                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 201                                         mb_array[numSegmentBlocks] = tempBlock;
 202                                         ++numSegmentBlocks;
 203                                 } else
 204                                         printk(" (duplicate)");
 205                         }
 206                         printk("\n");
 207                 }
 208                 existsBits <<= 1;
 209         }
 210         /* Now sort the blocks found into ascending sequence */
 211         if (numSegmentBlocks > 1) {
 212                 unsigned long m, n;
 213
 214                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 215                         for (n = numSegmentBlocks - 1; m < n; --n) {
 216                                 if (mb_array[n].absStart <
 217                                                 mb_array[n-1].absStart) {
 218                                         struct MemoryBlock tempBlock;
 219
 220                                         tempBlock = mb_array[n];
 221                                         mb_array[n] = mb_array[n-1];
 222                                         mb_array[n-1] = tempBlock;
 223                                 }
 224                         }
 225                 }
 226         }
 227         /*
 228          * Assign "logical" addresses to each block.  These
 229          * addresses correspond to the hypervisor "bitmap" space.
 230          * Convert all addresses into units of 256K chunks.
 231          */
 232         {
 233         unsigned long i, nextBitmapAddress;
 234
 235         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 236         nextBitmapAddress = 0;
 237         for (i = 0; i < numSegmentBlocks; ++i) {
 238                 unsigned long length = mb_array[i].absEnd -
 239                         mb_array[i].absStart;
 240
 241                 mb_array[i].logicalStart = nextBitmapAddress;
 242                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 243                 nextBitmapAddress += length;
 244                 printk("          Bitmap range: %016lx - %016lx\n"
 245                                 "        Absolute range: %016lx - %016lx\n",
 246                                 mb_array[i].logicalStart,
 247                                 mb_array[i].logicalEnd,
 248                                 mb_array[i].absStart, mb_array[i].absEnd);
 249                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 250                                 0x000fffffffffffff);
 251                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 252                                 0x000fffffffffffff);
 253                 mb_array[i].logicalStart =
 254                         addr_to_chunk(mb_array[i].logicalStart);
 255                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 256         }
 257         }
 258
 259         return numSegmentBlocks;
 260 }
 261
 262 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 263                 unsigned long max_entries)
 264 {
 265         unsigned long i;
 266         unsigned long mem_blocks = 0;
 267
 268         if (cpu_has_feature(CPU_FTR_SLB))
 269                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 270                                 max_entries);
 271         else
 272                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 273                                 max_entries);
 274
 275         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 276         for (i = 0; i < mem_blocks; ++i) {
 277                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 278                        "                             abs chunks %016lx - %016lx\n",
 279                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 280                         mb_array[i].absStart, mb_array[i].absEnd);
 281         }
 282         return mem_blocks;
 283 }
 284
 285 static void __init iSeries_get_cmdline(void)
 286 {
 287         char *p, *q;
 288
 289         /* copy the command line parameter from the primary VSP  */
 290         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 291                         HvLpDma_Direction_RemoteToLocal);
 292
 293         p = cmd_line;
 294         q = cmd_line + 255;
 295         while(p < q) {
 296                 if (!*p || *p == '\n')
 297                         break;
 298                 ++p;
 299         }
 300         *p = 0;
 301 }
 302
 303 static void __init iSeries_init_early(void)
 304 {
 305         extern unsigned long memory_limit;
 306
 307         DBG(" -> iSeries_init_early()\n");
 308
 309         ppc64_firmware_features = FW_FEATURE_ISERIES;
 310
 311         ppcdbg_initialize();
 312
 313         ppc64_interrupt_controller = IC_ISERIES;
 314
 315 #if defined(CONFIG_BLK_DEV_INITRD)
 316         /*
 317          * If the init RAM disk has been configured and there is
 318          * a non-zero starting address for it, set it up
 319          */
 320         if (naca.xRamDisk) {
 321                 initrd_start = (unsigned long)__va(naca.xRamDisk);
 322                 initrd_end = initrd_start + naca.xRamDiskSize * PAGE_SIZE;
 323                 initrd_below_start_ok = 1;      // ramdisk in kernel space
 324                 ROOT_DEV = Root_RAM0;
 325                 if (((rd_size * 1024) / PAGE_SIZE) < naca.xRamDiskSize)
 326                         rd_size = (naca.xRamDiskSize * PAGE_SIZE) / 1024;
 327         } else
 328 #endif /* CONFIG_BLK_DEV_INITRD */
 329         {
 330             /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
 331         }
 332
 333         iSeries_recal_tb = get_tb();
 334         iSeries_recal_titan = HvCallXm_loadTod();
 335
 336         /*
 337          * Initialize the hash table management pointers
 338          */
 339         hpte_init_iSeries();
 340
 341         /*
 342          * Initialize the DMA/TCE management
 343          */
 344         iommu_init_early_iSeries();
 345
 346         iSeries_get_cmdline();
 347
 348         /* Save unparsed command line copy for /proc/cmdline */
 349         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 350
 351         /* Parse early parameters, in particular mem=x */
 352         parse_early_param();
 353
 354         if (memory_limit) {
 355                 if (memory_limit < systemcfg->physicalMemorySize)
 356                         systemcfg->physicalMemorySize = memory_limit;
 357                 else {
 358                         printk("Ignoring mem=%lu >= ram_top.\n", memory_limit);
 359                         memory_limit = 0;
 360                 }
 361         }
 362
 363         /* Initialize machine-dependency vectors */
 364 #ifdef CONFIG_SMP
 365         smp_init_iSeries();
 366 #endif
 367         if (itLpNaca.xPirEnvironMode == 0)
 368                 piranha_simulator = 1;
 369
 370         /* Associate Lp Event Queue 0 with processor 0 */
 371         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 372
 373         mf_init();
 374         mf_initialized = 1;
 375         mb();
 376
 377         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 378          * look sensible. If not, clear initrd reference.
 379          */
 380 #ifdef CONFIG_BLK_DEV_INITRD
 381         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 382             initrd_end > initrd_start)
 383                 ROOT_DEV = Root_RAM0;
 384         else
 385                 initrd_start = initrd_end = 0;
 386 #endif /* CONFIG_BLK_DEV_INITRD */
 387
 388         DBG(" <- iSeries_init_early()\n");
 389 }
 390
 391 struct mschunks_map mschunks_map = {
 392         /* XXX We don't use these, but Piranha might need them. */
 393         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 394         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 395         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 396 };
 397 EXPORT_SYMBOL(mschunks_map);
 398
 399 void mschunks_alloc(unsigned long num_chunks)
 400 {
 401         klimit = _ALIGN(klimit, sizeof(u32));
 402         mschunks_map.mapping = (u32 *)klimit;
 403         klimit += num_chunks * sizeof(u32);
 404         mschunks_map.num_chunks = num_chunks;
 405 }
 406
 407 /*
 408  * The iSeries may have very large memories ( > 128 GB ) and a partition
 409  * may get memory in "chunks" that may be anywhere in the 2**52 real
 410  * address space.  The chunks are 256K in size.  To map this to the
 411  * memory model Linux expects, the AS/400 specific code builds a
 412  * translation table to translate what Linux thinks are "physical"
 413  * addresses to the actual real addresses.  This allows us to make
 414  * it appear to Linux that we have contiguous memory starting at
 415  * physical address zero while in fact this could be far from the truth.
 416  * To avoid confusion, I'll let the words physical and/or real address
 417  * apply to the Linux addresses while I'll use "absolute address" to
 418  * refer to the actual hardware real address.
 419  *
 420  * build_iSeries_Memory_Map gets information from the Hypervisor and
 421  * looks at the Main Store VPD to determine the absolute addresses
 422  * of the memory that has been assigned to our partition and builds
 423  * a table used to translate Linux's physical addresses to these
 424  * absolute addresses.  Absolute addresses are needed when
 425  * communicating with the hypervisor (e.g. to build HPT entries)
 426  */
 427
 428 static void __init build_iSeries_Memory_Map(void)
 429 {
 430         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 431         u32 nextPhysChunk;
 432         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 433         u32 totalChunks,moreChunks;
 434         u32 currChunk, thisChunk, absChunk;
 435         u32 currDword;
 436         u32 chunkBit;
 437         u64 map;
 438         struct MemoryBlock mb[32];
 439         unsigned long numMemoryBlocks, curBlock;
 440
 441         /* Chunk size on iSeries is 256K bytes */
 442         totalChunks = (u32)HvLpConfig_getMsChunks();
 443         mschunks_alloc(totalChunks);
 444
 445         /*
 446          * Get absolute address of our load area
 447          * and map it to physical address 0
 448          * This guarantees that the loadarea ends up at physical 0
 449          * otherwise, it might not be returned by PLIC as the first
 450          * chunks
 451          */
 452
 453         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 454         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 455
 456         /*
 457          * Only add the pages already mapped here.
 458          * Otherwise we might add the hpt pages
 459          * The rest of the pages of the load area
 460          * aren't in the HPT yet and can still
 461          * be assigned an arbitrary physical address
 462          */
 463         if ((loadAreaSize * 64) > HvPagesToMap)
 464                 loadAreaSize = HvPagesToMap / 64;
 465
 466         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 467
 468         /*
 469          * TODO Do we need to do something if the HPT is in the 64MB load area?
 470          * This would be required if the itLpNaca.xLoadAreaChunks includes
 471          * the HPT size
 472          */
 473
 474         printk("Mapping load area - physical addr = 0000000000000000\n"
 475                 "                    absolute addr = %016lx\n",
 476                 chunk_to_addr(loadAreaFirstChunk));
 477         printk("Load area size %dK\n", loadAreaSize * 256);
 478
 479         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 480                 mschunks_map.mapping[nextPhysChunk] =
 481                         loadAreaFirstChunk + nextPhysChunk;
 482
 483         /*
 484          * Get absolute address of our HPT and remember it so
 485          * we won't map it to any physical address
 486          */
 487         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 488         hptSizePages = (u32)HvCallHpt_getHptPages();
 489         hptSizeChunks = hptSizePages >> (MSCHUNKS_CHUNK_SHIFT - PAGE_SHIFT);
 490         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 491
 492         printk("HPT absolute addr = %016lx, size = %dK\n",
 493                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 494
 495         ppc64_pft_size = __ilog2(hptSizePages * PAGE_SIZE);
 496
 497         /*
 498          * The actual hashed page table is in the hypervisor,
 499          * we have no direct access
 500          */
 501         htab_address = NULL;
 502
 503         /*
 504          * Determine if absolute memory has any
 505          * holes so that we can interpret the
 506          * access map we get back from the hypervisor
 507          * correctly.
 508          */
 509         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 510
 511         /*
 512          * Process the main store access map from the hypervisor
 513          * to build up our physical -> absolute translation table
 514          */
 515         curBlock = 0;
 516         currChunk = 0;
 517         currDword = 0;
 518         moreChunks = totalChunks;
 519
 520         while (moreChunks) {
 521                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 522                                 currDword);
 523                 thisChunk = currChunk;
 524                 while (map) {
 525                         chunkBit = map >> 63;
 526                         map <<= 1;
 527                         if (chunkBit) {
 528                                 --moreChunks;
 529                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 530                                         ++curBlock;
 531                                         if (curBlock >= numMemoryBlocks)
 532                                                 panic("out of memory blocks");
 533                                 }
 534                                 if (thisChunk < mb[curBlock].logicalStart)
 535                                         panic("memory block error");
 536
 537                                 absChunk = mb[curBlock].absStart +
 538                                         (thisChunk - mb[curBlock].logicalStart);
 539                                 if (((absChunk < hptFirstChunk) ||
 540                                      (absChunk > hptLastChunk)) &&
 541                                     ((absChunk < loadAreaFirstChunk) ||
 542                                      (absChunk > loadAreaLastChunk))) {
 543                                         mschunks_map.mapping[nextPhysChunk] =
 544                                                 absChunk;
 545                                         ++nextPhysChunk;
 546                                 }
 547                         }
 548                         ++thisChunk;
 549                 }
 550                 ++currDword;
 551                 currChunk += 64;
 552         }
 553
 554         /*
 555          * main store size (in chunks) is
 556          *   totalChunks - hptSizeChunks
 557          * which should be equal to
 558          *   nextPhysChunk
 559          */
 560         systemcfg->physicalMemorySize = chunk_to_addr(nextPhysChunk);
 561 }
 562
 563 /*
 564  * Document me.
 565  */
 566 static void __init iSeries_setup_arch(void)
 567 {
 568         unsigned procIx = get_paca()->lppaca.dyn_hv_phys_proc_index;
 569
 570         if (get_paca()->lppaca.shared_proc) {
 571                 ppc_md.idle_loop = iseries_shared_idle;
 572                 printk(KERN_INFO "Using shared processor idle loop\n");
 573         } else {
 574                 ppc_md.idle_loop = iseries_dedicated_idle;
 575                 printk(KERN_INFO "Using dedicated idle loop\n");
 576         }
 577
 578         /* Setup the Lp Event Queue */
 579         setup_hvlpevent_queue();
 580
 581         printk("Max  logical processors = %d\n",
 582                         itVpdAreas.xSlicMaxLogicalProcs);
 583         printk("Max physical processors = %d\n",
 584                         itVpdAreas.xSlicMaxPhysicalProcs);
 585
 586         systemcfg->processor = xIoHriProcessorVpd[procIx].xPVR;
 587         printk("Processor version = %x\n", systemcfg->processor);
 588 }
 589
 590 static void iSeries_show_cpuinfo(struct seq_file *m)
 591 {
 592         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 593 }
 594
 595 /*
 596  * Document me.
 597  * and Implement me.
 598  */
 599 static int iSeries_get_irq(struct pt_regs *regs)
 600 {
 601         /* -2 means ignore this interrupt */
 602         return -2;
 603 }
 604
 605 /*
 606  * Document me.
 607  */
 608 static void iSeries_restart(char *cmd)
 609 {
 610         mf_reboot();
 611 }
 612
 613 /*
 614  * Document me.
 615  */
 616 static void iSeries_power_off(void)
 617 {
 618         mf_power_off();
 619 }
 620
 621 /*
 622  * Document me.
 623  */
 624 static void iSeries_halt(void)
 625 {
 626         mf_power_off();
 627 }
 628
 629 static void __init iSeries_progress(char * st, unsigned short code)
 630 {
 631         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 632         if (!piranha_simulator && mf_initialized) {
 633                 if (code != 0xffff)
 634                         mf_display_progress(code);
 635                 else
 636                         mf_clear_src();
 637         }
 638 }
 639
 640 static void __init iSeries_fixup_klimit(void)
 641 {
 642         /*
 643          * Change klimit to take into account any ram disk
 644          * that may be included
 645          */
 646         if (naca.xRamDisk)
 647                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 648                         (naca.xRamDiskSize * PAGE_SIZE);
 649         else {
 650                 /*
 651                  * No ram disk was included - check and see if there
 652                  * was an embedded system map.  Change klimit to take
 653                  * into account any embedded system map
 654                  */
 655                 if (embedded_sysmap_end)
 656                         klimit = KERNELBASE + ((embedded_sysmap_end + 4095) &
 657                                         0xfffffffffffff000);
 658         }
 659 }
 660
 661 static int __init iSeries_src_init(void)
 662 {
 663         /* clear the progress line */
 664         ppc_md.progress(" ", 0xffff);
 665         return 0;
 666 }
 667
 668 late_initcall(iSeries_src_init);
 669
 670 static inline void process_iSeries_events(void)
 671 {
 672         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 673 }
 674
 675 static void yield_shared_processor(void)
 676 {
 677         unsigned long tb;
 678
 679         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 680                                     HvCall_MaskLpEvent |
 681                                     HvCall_MaskLpProd |
 682                                     HvCall_MaskTimeout);
 683
 684         tb = get_tb();
 685         /* Compute future tb value when yield should expire */
 686         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 687
 688         /*
 689          * The decrementer stops during the yield.  Force a fake decrementer
 690          * here and let the timer_interrupt code sort out the actual time.
 691          */
 692         get_paca()->lppaca.int_dword.fields.decr_int = 1;
 693         process_iSeries_events();
 694 }
 695
 696 static void iseries_shared_idle(void)
 697 {
 698         while (1) {
 699                 while (!need_resched() && !hvlpevent_is_pending()) {
 700                         local_irq_disable();
 701                         ppc64_runlatch_off();
 702
 703                         /* Recheck with irqs off */
 704                         if (!need_resched() && !hvlpevent_is_pending())
 705                                 yield_shared_processor();
 706
 707                         HMT_medium();
 708                         local_irq_enable();
 709                 }
 710
 711                 ppc64_runlatch_on();
 712
 713                 if (hvlpevent_is_pending())
 714                         process_iSeries_events();
 715
 716                 schedule();
 717         }
 718 }
 719
 720 static void iseries_dedicated_idle(void)
 721 {
 722         long oldval;
 723
 724         while (1) {
 725                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 726
 727                 if (!oldval) {
 728                         set_thread_flag(TIF_POLLING_NRFLAG);
 729
 730                         while (!need_resched()) {
 731                                 ppc64_runlatch_off();
 732                                 HMT_low();
 733
 734                                 if (hvlpevent_is_pending()) {
 735                                         HMT_medium();
 736                                         ppc64_runlatch_on();
 737                                         process_iSeries_events();
 738                                 }
 739                         }
 740
 741                         HMT_medium();
 742                         clear_thread_flag(TIF_POLLING_NRFLAG);
 743                 } else {
 744                         set_need_resched();
 745                 }
 746
 747                 ppc64_runlatch_on();
 748                 schedule();
 749         }
 750 }
 751
 752 #ifndef CONFIG_PCI
 753 void __init iSeries_init_IRQ(void) { }
 754 #endif
 755
 756 static int __init iseries_probe(int platform)
 757 {
 758         return PLATFORM_ISERIES_LPAR == platform;
 759 }
 760
 761 struct machdep_calls __initdata iseries_md = {
 762         .setup_arch     = iSeries_setup_arch,
 763         .show_cpuinfo   = iSeries_show_cpuinfo,
 764         .init_IRQ       = iSeries_init_IRQ,
 765         .get_irq        = iSeries_get_irq,
 766         .init_early     = iSeries_init_early,
 767         .pcibios_fixup  = iSeries_pci_final_fixup,
 768         .restart        = iSeries_restart,
 769         .power_off      = iSeries_power_off,
 770         .halt           = iSeries_halt,
 771         .get_boot_time  = iSeries_get_boot_time,
 772         .set_rtc_time   = iSeries_set_rtc_time,
 773         .get_rtc_time   = iSeries_get_rtc_time,
 774         .calibrate_decr = generic_calibrate_decr,
 775         .progress       = iSeries_progress,
 776         .probe          = iseries_probe,
 777         /* XXX Implement enable_pmcs for iSeries */
 778 };
 779
 780 struct blob {
 781         unsigned char data[PAGE_SIZE];
 782         unsigned long next;
 783 };
 784
 785 struct iseries_flat_dt {
 786         struct boot_param_header header;
 787         u64 reserve_map[2];
 788         struct blob dt;
 789         struct blob strings;
 790 };
 791
 792 struct iseries_flat_dt iseries_dt;
 793
 794 void dt_init(struct iseries_flat_dt *dt)
 795 {
 796         dt->header.off_mem_rsvmap =
 797                 offsetof(struct iseries_flat_dt, reserve_map);
 798         dt->header.off_dt_struct = offsetof(struct iseries_flat_dt, dt);
 799         dt->header.off_dt_strings = offsetof(struct iseries_flat_dt, strings);
 800         dt->header.totalsize = sizeof(struct iseries_flat_dt);
 801         dt->header.dt_strings_size = sizeof(struct blob);
 802
 803         /* There is no notion of hardware cpu id on iSeries */
 804         dt->header.boot_cpuid_phys = smp_processor_id();
 805
 806         dt->dt.next = (unsigned long)&dt->dt.data;
 807         dt->strings.next = (unsigned long)&dt->strings.data;
 808
 809         dt->header.magic = OF_DT_HEADER;
 810         dt->header.version = 0x10;
 811         dt->header.last_comp_version = 0x10;
 812
 813         dt->reserve_map[0] = 0;
 814         dt->reserve_map[1] = 0;
 815 }
 816
 817 void dt_check_blob(struct blob *b)
 818 {
 819         if (b->next >= (unsigned long)&b->next) {
 820                 DBG("Ran out of space in flat device tree blob!\n");
 821                 BUG();
 822         }
 823 }
 824
 825 void dt_push_u32(struct iseries_flat_dt *dt, u32 value)
 826 {
 827         *((u32*)dt->dt.next) = value;
 828         dt->dt.next += sizeof(u32);
 829
 830         dt_check_blob(&dt->dt);
 831 }
 832
 833 void dt_push_u64(struct iseries_flat_dt *dt, u64 value)
 834 {
 835         *((u64*)dt->dt.next) = value;
 836         dt->dt.next += sizeof(u64);
 837
 838         dt_check_blob(&dt->dt);
 839 }
 840
 841 unsigned long dt_push_bytes(struct blob *blob, char *data, int len)
 842 {
 843         unsigned long start = blob->next - (unsigned long)blob->data;
 844
 845         memcpy((char *)blob->next, data, len);
 846         blob->next = _ALIGN(blob->next + len, 4);
 847
 848         dt_check_blob(blob);
 849
 850         return start;
 851 }
 852
 853 void dt_start_node(struct iseries_flat_dt *dt, char *name)
 854 {
 855         dt_push_u32(dt, OF_DT_BEGIN_NODE);
 856         dt_push_bytes(&dt->dt, name, strlen(name) + 1);
 857 }
 858
 859 #define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
 860
 861 void dt_prop(struct iseries_flat_dt *dt, char *name, char *data, int len)
 862 {
 863         unsigned long offset;
 864
 865         dt_push_u32(dt, OF_DT_PROP);
 866
 867         /* Length of the data */
 868         dt_push_u32(dt, len);
 869
 870         /* Put the property name in the string blob. */
 871         offset = dt_push_bytes(&dt->strings, name, strlen(name) + 1);
 872
 873         /* The offset of the properties name in the string blob. */
 874         dt_push_u32(dt, (u32)offset);
 875
 876         /* The actual data. */
 877         dt_push_bytes(&dt->dt, data, len);
 878 }
 879
 880 void dt_prop_str(struct iseries_flat_dt *dt, char *name, char *data)
 881 {
 882         dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
 883 }
 884
 885 void dt_prop_u32(struct iseries_flat_dt *dt, char *name, u32 data)
 886 {
 887         dt_prop(dt, name, (char *)&data, sizeof(u32));
 888 }
 889
 890 void dt_prop_u64(struct iseries_flat_dt *dt, char *name, u64 data)
 891 {
 892         dt_prop(dt, name, (char *)&data, sizeof(u64));
 893 }
 894
 895 void dt_prop_u64_list(struct iseries_flat_dt *dt, char *name, u64 *data, int n)
 896 {
 897         dt_prop(dt, name, (char *)data, sizeof(u64) * n);
 898 }
 899
 900 void dt_prop_empty(struct iseries_flat_dt *dt, char *name)
 901 {
 902         dt_prop(dt, name, NULL, 0);
 903 }
 904
 905 void dt_cpus(struct iseries_flat_dt *dt)
 906 {
 907         unsigned char buf[32];
 908         unsigned char *p;
 909         unsigned int i, index;
 910         struct IoHriProcessorVpd *d;
 911
 912         /* yuck */
 913         snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
 914         p = strchr(buf, ' ');
 915         if (!p) p = buf + strlen(buf);
 916
 917         dt_start_node(dt, "cpus");
 918         dt_prop_u32(dt, "#address-cells", 1);
 919         dt_prop_u32(dt, "#size-cells", 0);
 920
 921         for (i = 0; i < NR_CPUS; i++) {
 922                 if (paca[i].lppaca.dyn_proc_status >= 2)
 923                         continue;
 924
 925                 snprintf(p, 32 - (p - buf), "@%d", i);
 926                 dt_start_node(dt, buf);
 927
 928                 dt_prop_str(dt, "device_type", "cpu");
 929
 930                 index = paca[i].lppaca.dyn_hv_phys_proc_index;
 931                 d = &xIoHriProcessorVpd[index];
 932
 933                 dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
 934                 dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);
 935
 936                 dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
 937                 dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);
 938
 939                 /* magic conversions to Hz copied from old code */
 940                 dt_prop_u32(dt, "clock-frequency",
 941                         ((1UL << 34) * 1000000) / d->xProcFreq);
 942                 dt_prop_u32(dt, "timebase-frequency",
 943                         ((1UL << 32) * 1000000) / d->xTimeBaseFreq);
 944
 945                 dt_prop_u32(dt, "reg", i);
 946
 947                 dt_end_node(dt);
 948         }
 949
 950         dt_end_node(dt);
 951 }
 952
 953 void build_flat_dt(struct iseries_flat_dt *dt)
 954 {
 955         u64 tmp[2];
 956
 957         dt_init(dt);
 958
 959         dt_start_node(dt, "");
 960
 961         dt_prop_u32(dt, "#address-cells", 2);
 962         dt_prop_u32(dt, "#size-cells", 2);
 963
 964         /* /memory */
 965         dt_start_node(dt, "memory@0");
 966         dt_prop_str(dt, "name", "memory");
 967         dt_prop_str(dt, "device_type", "memory");
 968         tmp[0] = 0;
 969         tmp[1] = systemcfg->physicalMemorySize;
 970         dt_prop_u64_list(dt, "reg", tmp, 2);
 971         dt_end_node(dt);
 972
 973         /* /chosen */
 974         dt_start_node(dt, "chosen");
 975         dt_prop_u32(dt, "linux,platform", PLATFORM_ISERIES_LPAR);
 976         dt_end_node(dt);
 977
 978         dt_cpus(dt);
 979
 980         dt_end_node(dt);
 981
 982         dt_push_u32(dt, OF_DT_END);
 983 }
 984
 985 void * __init iSeries_early_setup(void)
 986 {
 987         iSeries_fixup_klimit();
 988
 989         /*
 990          * Initialize the table which translate Linux physical addresses to
 991          * AS/400 absolute addresses
 992          */
 993         build_iSeries_Memory_Map();
 994
 995         build_flat_dt(&iseries_dt);
 996
 997         return (void *) __pa(&iseries_dt);
 998 }