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   1 /*
   2  * Derived from arch/powerpc/kernel/iommu.c
   3  *
   4  * Copyright IBM Corporation, 2006-2007
   5  * Copyright (C) 2006  Jon Mason <jdmason@kudzu.us>
   6  *
   7  * Author: Jon Mason <jdmason@kudzu.us>
   8  * Author: Muli Ben-Yehuda <muli@il.ibm.com>
   9
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/types.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/string.h>
  32 #include <linux/crash_dump.h>
  33 #include <linux/dma-mapping.h>
  34 #include <linux/bitops.h>
  35 #include <linux/pci_ids.h>
  36 #include <linux/pci.h>
  37 #include <linux/delay.h>
  38 #include <linux/scatterlist.h>
  39 #include <linux/iommu-helper.h>
  40
  41 #include <asm/iommu.h>
  42 #include <asm/calgary.h>
  43 #include <asm/tce.h>
  44 #include <asm/pci-direct.h>
  45 #include <asm/system.h>
  46 #include <asm/dma.h>
  47 #include <asm/rio.h>
  48 #include <asm/bios_ebda.h>
  49
  50 #ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
  51 int use_calgary __read_mostly = 1;
  52 #else
  53 int use_calgary __read_mostly = 0;
  54 #endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
  55
  56 #define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
  57 #define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
  58
  59 /* register offsets inside the host bridge space */
  60 #define CALGARY_CONFIG_REG      0x0108
  61 #define PHB_CSR_OFFSET          0x0110 /* Channel Status */
  62 #define PHB_PLSSR_OFFSET        0x0120
  63 #define PHB_CONFIG_RW_OFFSET    0x0160
  64 #define PHB_IOBASE_BAR_LOW      0x0170
  65 #define PHB_IOBASE_BAR_HIGH     0x0180
  66 #define PHB_MEM_1_LOW           0x0190
  67 #define PHB_MEM_1_HIGH          0x01A0
  68 #define PHB_IO_ADDR_SIZE        0x01B0
  69 #define PHB_MEM_1_SIZE          0x01C0
  70 #define PHB_MEM_ST_OFFSET       0x01D0
  71 #define PHB_AER_OFFSET          0x0200
  72 #define PHB_CONFIG_0_HIGH       0x0220
  73 #define PHB_CONFIG_0_LOW        0x0230
  74 #define PHB_CONFIG_0_END        0x0240
  75 #define PHB_MEM_2_LOW           0x02B0
  76 #define PHB_MEM_2_HIGH          0x02C0
  77 #define PHB_MEM_2_SIZE_HIGH     0x02D0
  78 #define PHB_MEM_2_SIZE_LOW      0x02E0
  79 #define PHB_DOSHOLE_OFFSET      0x08E0
  80
  81 /* CalIOC2 specific */
  82 #define PHB_SAVIOR_L2           0x0DB0
  83 #define PHB_PAGE_MIG_CTRL       0x0DA8
  84 #define PHB_PAGE_MIG_DEBUG      0x0DA0
  85 #define PHB_ROOT_COMPLEX_STATUS 0x0CB0
  86
  87 /* PHB_CONFIG_RW */
  88 #define PHB_TCE_ENABLE          0x20000000
  89 #define PHB_SLOT_DISABLE        0x1C000000
  90 #define PHB_DAC_DISABLE         0x01000000
  91 #define PHB_MEM2_ENABLE         0x00400000
  92 #define PHB_MCSR_ENABLE         0x00100000
  93 /* TAR (Table Address Register) */
  94 #define TAR_SW_BITS             0x0000ffffffff800fUL
  95 #define TAR_VALID               0x0000000000000008UL
  96 /* CSR (Channel/DMA Status Register) */
  97 #define CSR_AGENT_MASK          0xffe0ffff
  98 /* CCR (Calgary Configuration Register) */
  99 #define CCR_2SEC_TIMEOUT        0x000000000000000EUL
 100 /* PMCR/PMDR (Page Migration Control/Debug Registers */
 101 #define PMR_SOFTSTOP            0x80000000
 102 #define PMR_SOFTSTOPFAULT       0x40000000
 103 #define PMR_HARDSTOP            0x20000000
 104
 105 #define MAX_NUM_OF_PHBS         8 /* how many PHBs in total? */
 106 #define MAX_NUM_CHASSIS         8 /* max number of chassis */
 107 /* MAX_PHB_BUS_NUM is the maximal possible dev->bus->number */
 108 #define MAX_PHB_BUS_NUM         (MAX_NUM_OF_PHBS * MAX_NUM_CHASSIS * 2)
 109 #define PHBS_PER_CALGARY        4
 110
 111 /* register offsets in Calgary's internal register space */
 112 static const unsigned long tar_offsets[] = {
 113         0x0580 /* TAR0 */,
 114         0x0588 /* TAR1 */,
 115         0x0590 /* TAR2 */,
 116         0x0598 /* TAR3 */
 117 };
 118
 119 static const unsigned long split_queue_offsets[] = {
 120         0x4870 /* SPLIT QUEUE 0 */,
 121         0x5870 /* SPLIT QUEUE 1 */,
 122         0x6870 /* SPLIT QUEUE 2 */,
 123         0x7870 /* SPLIT QUEUE 3 */
 124 };
 125
 126 static const unsigned long phb_offsets[] = {
 127         0x8000 /* PHB0 */,
 128         0x9000 /* PHB1 */,
 129         0xA000 /* PHB2 */,
 130         0xB000 /* PHB3 */
 131 };
 132
 133 /* PHB debug registers */
 134
 135 static const unsigned long phb_debug_offsets[] = {
 136         0x4000  /* PHB 0 DEBUG */,
 137         0x5000  /* PHB 1 DEBUG */,
 138         0x6000  /* PHB 2 DEBUG */,
 139         0x7000  /* PHB 3 DEBUG */
 140 };
 141
 142 /*
 143  * STUFF register for each debug PHB,
 144  * byte 1 = start bus number, byte 2 = end bus number
 145  */
 146
 147 #define PHB_DEBUG_STUFF_OFFSET  0x0020
 148
 149 #define EMERGENCY_PAGES 32 /* = 128KB */
 150
 151 unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
 152 static int translate_empty_slots __read_mostly = 0;
 153 static int calgary_detected __read_mostly = 0;
 154
 155 static struct rio_table_hdr     *rio_table_hdr __initdata;
 156 static struct scal_detail       *scal_devs[MAX_NUMNODES] __initdata;
 157 static struct rio_detail        *rio_devs[MAX_NUMNODES * 4] __initdata;
 158
 159 struct calgary_bus_info {
 160         void *tce_space;
 161         unsigned char translation_disabled;
 162         signed char phbid;
 163         void __iomem *bbar;
 164 };
 165
 166 static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
 167 static void calgary_tce_cache_blast(struct iommu_table *tbl);
 168 static void calgary_dump_error_regs(struct iommu_table *tbl);
 169 static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
 170 static void calioc2_tce_cache_blast(struct iommu_table *tbl);
 171 static void calioc2_dump_error_regs(struct iommu_table *tbl);
 172 static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl);
 173 static void get_tce_space_from_tar(void);
 174
 175 static struct cal_chipset_ops calgary_chip_ops = {
 176         .handle_quirks = calgary_handle_quirks,
 177         .tce_cache_blast = calgary_tce_cache_blast,
 178         .dump_error_regs = calgary_dump_error_regs
 179 };
 180
 181 static struct cal_chipset_ops calioc2_chip_ops = {
 182         .handle_quirks = calioc2_handle_quirks,
 183         .tce_cache_blast = calioc2_tce_cache_blast,
 184         .dump_error_regs = calioc2_dump_error_regs
 185 };
 186
 187 static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
 188
 189 static inline int translation_enabled(struct iommu_table *tbl)
 190 {
 191         /* only PHBs with translation enabled have an IOMMU table */
 192         return (tbl != NULL);
 193 }
 194
 195 static void iommu_range_reserve(struct iommu_table *tbl,
 196         unsigned long start_addr, unsigned int npages)
 197 {
 198         unsigned long index;
 199         unsigned long end;
 200         unsigned long flags;
 201
 202         index = start_addr >> PAGE_SHIFT;
 203
 204         /* bail out if we're asked to reserve a region we don't cover */
 205         if (index >= tbl->it_size)
 206                 return;
 207
 208         end = index + npages;
 209         if (end > tbl->it_size) /* don't go off the table */
 210                 end = tbl->it_size;
 211
 212         spin_lock_irqsave(&tbl->it_lock, flags);
 213
 214         iommu_area_reserve(tbl->it_map, index, npages);
 215
 216         spin_unlock_irqrestore(&tbl->it_lock, flags);
 217 }
 218
 219 static unsigned long iommu_range_alloc(struct device *dev,
 220                                        struct iommu_table *tbl,
 221                                        unsigned int npages)
 222 {
 223         unsigned long flags;
 224         unsigned long offset;
 225         unsigned long boundary_size;
 226
 227         boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
 228                               PAGE_SIZE) >> PAGE_SHIFT;
 229
 230         BUG_ON(npages == 0);
 231
 232         spin_lock_irqsave(&tbl->it_lock, flags);
 233
 234         offset = iommu_area_alloc(tbl->it_map, tbl->it_size, tbl->it_hint,
 235                                   npages, 0, boundary_size, 0);
 236         if (offset == ~0UL) {
 237                 tbl->chip_ops->tce_cache_blast(tbl);
 238
 239                 offset = iommu_area_alloc(tbl->it_map, tbl->it_size, 0,
 240                                           npages, 0, boundary_size, 0);
 241                 if (offset == ~0UL) {
 242                         printk(KERN_WARNING "Calgary: IOMMU full.\n");
 243                         spin_unlock_irqrestore(&tbl->it_lock, flags);
 244                         if (panic_on_overflow)
 245                                 panic("Calgary: fix the allocator.\n");
 246                         else
 247                                 return bad_dma_address;
 248                 }
 249         }
 250
 251         tbl->it_hint = offset + npages;
 252         BUG_ON(tbl->it_hint > tbl->it_size);
 253
 254         spin_unlock_irqrestore(&tbl->it_lock, flags);
 255
 256         return offset;
 257 }
 258
 259 static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
 260                               void *vaddr, unsigned int npages, int direction)
 261 {
 262         unsigned long entry;
 263         dma_addr_t ret = bad_dma_address;
 264
 265         entry = iommu_range_alloc(dev, tbl, npages);
 266
 267         if (unlikely(entry == bad_dma_address))
 268                 goto error;
 269
 270         /* set the return dma address */
 271         ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
 272
 273         /* put the TCEs in the HW table */
 274         tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
 275                   direction);
 276
 277         return ret;
 278
 279 error:
 280         printk(KERN_WARNING "Calgary: failed to allocate %u pages in "
 281                "iommu %p\n", npages, tbl);
 282         return bad_dma_address;
 283 }
 284
 285 static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 286         unsigned int npages)
 287 {
 288         unsigned long entry;
 289         unsigned long badend;
 290         unsigned long flags;
 291
 292         /* were we called with bad_dma_address? */
 293         badend = bad_dma_address + (EMERGENCY_PAGES * PAGE_SIZE);
 294         if (unlikely((dma_addr >= bad_dma_address) && (dma_addr < badend))) {
 295                 WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
 296                        "address 0x%Lx\n", dma_addr);
 297                 return;
 298         }
 299
 300         entry = dma_addr >> PAGE_SHIFT;
 301
 302         BUG_ON(entry + npages > tbl->it_size);
 303
 304         tce_free(tbl, entry, npages);
 305
 306         spin_lock_irqsave(&tbl->it_lock, flags);
 307
 308         iommu_area_free(tbl->it_map, entry, npages);
 309
 310         spin_unlock_irqrestore(&tbl->it_lock, flags);
 311 }
 312
 313 static inline struct iommu_table *find_iommu_table(struct device *dev)
 314 {
 315         struct pci_dev *pdev;
 316         struct pci_bus *pbus;
 317         struct iommu_table *tbl;
 318
 319         pdev = to_pci_dev(dev);
 320
 321         pbus = pdev->bus;
 322
 323         /* is the device behind a bridge? Look for the root bus */
 324         while (pbus->parent)
 325                 pbus = pbus->parent;
 326
 327         tbl = pci_iommu(pbus);
 328
 329         BUG_ON(tbl && (tbl->it_busno != pbus->number));
 330
 331         return tbl;
 332 }
 333
 334 static void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
 335                              int nelems,enum dma_data_direction dir,
 336                              struct dma_attrs *attrs)
 337 {
 338         struct iommu_table *tbl = find_iommu_table(dev);
 339         struct scatterlist *s;
 340         int i;
 341
 342         if (!translation_enabled(tbl))
 343                 return;
 344
 345         for_each_sg(sglist, s, nelems, i) {
 346                 unsigned int npages;
 347                 dma_addr_t dma = s->dma_address;
 348                 unsigned int dmalen = s->dma_length;
 349
 350                 if (dmalen == 0)
 351                         break;
 352
 353                 npages = iommu_num_pages(dma, dmalen, PAGE_SIZE);
 354                 iommu_free(tbl, dma, npages);
 355         }
 356 }
 357
 358 static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
 359                           int nelems, enum dma_data_direction dir,
 360                           struct dma_attrs *attrs)
 361 {
 362         struct iommu_table *tbl = find_iommu_table(dev);
 363         struct scatterlist *s;
 364         unsigned long vaddr;
 365         unsigned int npages;
 366         unsigned long entry;
 367         int i;
 368
 369         for_each_sg(sg, s, nelems, i) {
 370                 BUG_ON(!sg_page(s));
 371
 372                 vaddr = (unsigned long) sg_virt(s);
 373                 npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
 374
 375                 entry = iommu_range_alloc(dev, tbl, npages);
 376                 if (entry == bad_dma_address) {
 377                         /* makes sure unmap knows to stop */
 378                         s->dma_length = 0;
 379                         goto error;
 380                 }
 381
 382                 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
 383
 384                 /* insert into HW table */
 385                 tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir);
 386
 387                 s->dma_length = s->length;
 388         }
 389
 390         return nelems;
 391 error:
 392         calgary_unmap_sg(dev, sg, nelems, dir, NULL);
 393         for_each_sg(sg, s, nelems, i) {
 394                 sg->dma_address = bad_dma_address;
 395                 sg->dma_length = 0;
 396         }
 397         return 0;
 398 }
 399
 400 static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
 401                                    unsigned long offset, size_t size,
 402                                    enum dma_data_direction dir,
 403                                    struct dma_attrs *attrs)
 404 {
 405         void *vaddr = page_address(page) + offset;
 406         unsigned long uaddr;
 407         unsigned int npages;
 408         struct iommu_table *tbl = find_iommu_table(dev);
 409
 410         uaddr = (unsigned long)vaddr;
 411         npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
 412
 413         return iommu_alloc(dev, tbl, vaddr, npages, dir);
 414 }
 415
 416 static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
 417                                size_t size, enum dma_data_direction dir,
 418                                struct dma_attrs *attrs)
 419 {
 420         struct iommu_table *tbl = find_iommu_table(dev);
 421         unsigned int npages;
 422
 423         npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
 424         iommu_free(tbl, dma_addr, npages);
 425 }
 426
 427 static void* calgary_alloc_coherent(struct device *dev, size_t size,
 428         dma_addr_t *dma_handle, gfp_t flag)
 429 {
 430         void *ret = NULL;
 431         dma_addr_t mapping;
 432         unsigned int npages, order;
 433         struct iommu_table *tbl = find_iommu_table(dev);
 434
 435         size = PAGE_ALIGN(size); /* size rounded up to full pages */
 436         npages = size >> PAGE_SHIFT;
 437         order = get_order(size);
 438
 439         flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 440
 441         /* alloc enough pages (and possibly more) */
 442         ret = (void *)__get_free_pages(flag, order);
 443         if (!ret)
 444                 goto error;
 445         memset(ret, 0, size);
 446
 447         /* set up tces to cover the allocated range */
 448         mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
 449         if (mapping == bad_dma_address)
 450                 goto free;
 451         *dma_handle = mapping;
 452         return ret;
 453 free:
 454         free_pages((unsigned long)ret, get_order(size));
 455         ret = NULL;
 456 error:
 457         return ret;
 458 }
 459
 460 static void calgary_free_coherent(struct device *dev, size_t size,
 461                                   void *vaddr, dma_addr_t dma_handle)
 462 {
 463         unsigned int npages;
 464         struct iommu_table *tbl = find_iommu_table(dev);
 465
 466         size = PAGE_ALIGN(size);
 467         npages = size >> PAGE_SHIFT;
 468
 469         iommu_free(tbl, dma_handle, npages);
 470         free_pages((unsigned long)vaddr, get_order(size));
 471 }
 472
 473 static struct dma_map_ops calgary_dma_ops = {
 474         .alloc_coherent = calgary_alloc_coherent,
 475         .free_coherent = calgary_free_coherent,
 476         .map_sg = calgary_map_sg,
 477         .unmap_sg = calgary_unmap_sg,
 478         .map_page = calgary_map_page,
 479         .unmap_page = calgary_unmap_page,
 480 };
 481
 482 static inline void __iomem * busno_to_bbar(unsigned char num)
 483 {
 484         return bus_info[num].bbar;
 485 }
 486
 487 static inline int busno_to_phbid(unsigned char num)
 488 {
 489         return bus_info[num].phbid;
 490 }
 491
 492 static inline unsigned long split_queue_offset(unsigned char num)
 493 {
 494         size_t idx = busno_to_phbid(num);
 495
 496         return split_queue_offsets[idx];
 497 }
 498
 499 static inline unsigned long tar_offset(unsigned char num)
 500 {
 501         size_t idx = busno_to_phbid(num);
 502
 503         return tar_offsets[idx];
 504 }
 505
 506 static inline unsigned long phb_offset(unsigned char num)
 507 {
 508         size_t idx = busno_to_phbid(num);
 509
 510         return phb_offsets[idx];
 511 }
 512
 513 static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
 514 {
 515         unsigned long target = ((unsigned long)bar) | offset;
 516         return (void __iomem*)target;
 517 }
 518
 519 static inline int is_calioc2(unsigned short device)
 520 {
 521         return (device == PCI_DEVICE_ID_IBM_CALIOC2);
 522 }
 523
 524 static inline int is_calgary(unsigned short device)
 525 {
 526         return (device == PCI_DEVICE_ID_IBM_CALGARY);
 527 }
 528
 529 static inline int is_cal_pci_dev(unsigned short device)
 530 {
 531         return (is_calgary(device) || is_calioc2(device));
 532 }
 533
 534 static void calgary_tce_cache_blast(struct iommu_table *tbl)
 535 {
 536         u64 val;
 537         u32 aer;
 538         int i = 0;
 539         void __iomem *bbar = tbl->bbar;
 540         void __iomem *target;
 541
 542         /* disable arbitration on the bus */
 543         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 544         aer = readl(target);
 545         writel(0, target);
 546
 547         /* read plssr to ensure it got there */
 548         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
 549         val = readl(target);
 550
 551         /* poll split queues until all DMA activity is done */
 552         target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
 553         do {
 554                 val = readq(target);
 555                 i++;
 556         } while ((val & 0xff) != 0xff && i < 100);
 557         if (i == 100)
 558                 printk(KERN_WARNING "Calgary: PCI bus not quiesced, "
 559                        "continuing anyway\n");
 560
 561         /* invalidate TCE cache */
 562         target = calgary_reg(bbar, tar_offset(tbl->it_busno));
 563         writeq(tbl->tar_val, target);
 564
 565         /* enable arbitration */
 566         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 567         writel(aer, target);
 568         (void)readl(target); /* flush */
 569 }
 570
 571 static void calioc2_tce_cache_blast(struct iommu_table *tbl)
 572 {
 573         void __iomem *bbar = tbl->bbar;
 574         void __iomem *target;
 575         u64 val64;
 576         u32 val;
 577         int i = 0;
 578         int count = 1;
 579         unsigned char bus = tbl->it_busno;
 580
 581 begin:
 582         printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
 583                "sequence - count %d\n", bus, count);
 584
 585         /* 1. using the Page Migration Control reg set SoftStop */
 586         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
 587         val = be32_to_cpu(readl(target));
 588         printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
 589         val |= PMR_SOFTSTOP;
 590         printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
 591         writel(cpu_to_be32(val), target);
 592
 593         /* 2. poll split queues until all DMA activity is done */
 594         printk(KERN_DEBUG "2a. starting to poll split queues\n");
 595         target = calgary_reg(bbar, split_queue_offset(bus));
 596         do {
 597                 val64 = readq(target);
 598                 i++;
 599         } while ((val64 & 0xff) != 0xff && i < 100);
 600         if (i == 100)
 601                 printk(KERN_WARNING "CalIOC2: PCI bus not quiesced, "
 602                        "continuing anyway\n");
 603
 604         /* 3. poll Page Migration DEBUG for SoftStopFault */
 605         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
 606         val = be32_to_cpu(readl(target));
 607         printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
 608
 609         /* 4. if SoftStopFault - goto (1) */
 610         if (val & PMR_SOFTSTOPFAULT) {
 611                 if (++count < 100)
 612                         goto begin;
 613                 else {
 614                         printk(KERN_WARNING "CalIOC2: too many SoftStopFaults, "
 615                                "aborting TCE cache flush sequence!\n");
 616                         return; /* pray for the best */
 617                 }
 618         }
 619
 620         /* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
 621         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
 622         printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
 623         val = be32_to_cpu(readl(target));
 624         printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
 625         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
 626         val = be32_to_cpu(readl(target));
 627         printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
 628
 629         /* 6. invalidate TCE cache */
 630         printk(KERN_DEBUG "6. invalidating TCE cache\n");
 631         target = calgary_reg(bbar, tar_offset(bus));
 632         writeq(tbl->tar_val, target);
 633
 634         /* 7. Re-read PMCR */
 635         printk(KERN_DEBUG "7a. Re-reading PMCR\n");
 636         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
 637         val = be32_to_cpu(readl(target));
 638         printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
 639
 640         /* 8. Remove HardStop */
 641         printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
 642         target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
 643         val = 0;
 644         printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
 645         writel(cpu_to_be32(val), target);
 646         val = be32_to_cpu(readl(target));
 647         printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
 648 }
 649
 650 static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
 651         u64 limit)
 652 {
 653         unsigned int numpages;
 654
 655         limit = limit | 0xfffff;
 656         limit++;
 657
 658         numpages = ((limit - start) >> PAGE_SHIFT);
 659         iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
 660 }
 661
 662 static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
 663 {
 664         void __iomem *target;
 665         u64 low, high, sizelow;
 666         u64 start, limit;
 667         struct iommu_table *tbl = pci_iommu(dev->bus);
 668         unsigned char busnum = dev->bus->number;
 669         void __iomem *bbar = tbl->bbar;
 670
 671         /* peripheral MEM_1 region */
 672         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
 673         low = be32_to_cpu(readl(target));
 674         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
 675         high = be32_to_cpu(readl(target));
 676         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
 677         sizelow = be32_to_cpu(readl(target));
 678
 679         start = (high << 32) | low;
 680         limit = sizelow;
 681
 682         calgary_reserve_mem_region(dev, start, limit);
 683 }
 684
 685 static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
 686 {
 687         void __iomem *target;
 688         u32 val32;
 689         u64 low, high, sizelow, sizehigh;
 690         u64 start, limit;
 691         struct iommu_table *tbl = pci_iommu(dev->bus);
 692         unsigned char busnum = dev->bus->number;
 693         void __iomem *bbar = tbl->bbar;
 694
 695         /* is it enabled? */
 696         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 697         val32 = be32_to_cpu(readl(target));
 698         if (!(val32 & PHB_MEM2_ENABLE))
 699                 return;
 700
 701         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
 702         low = be32_to_cpu(readl(target));
 703         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
 704         high = be32_to_cpu(readl(target));
 705         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
 706         sizelow = be32_to_cpu(readl(target));
 707         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
 708         sizehigh = be32_to_cpu(readl(target));
 709
 710         start = (high << 32) | low;
 711         limit = (sizehigh << 32) | sizelow;
 712
 713         calgary_reserve_mem_region(dev, start, limit);
 714 }
 715
 716 /*
 717  * some regions of the IO address space do not get translated, so we
 718  * must not give devices IO addresses in those regions. The regions
 719  * are the 640KB-1MB region and the two PCI peripheral memory holes.
 720  * Reserve all of them in the IOMMU bitmap to avoid giving them out
 721  * later.
 722  */
 723 static void __init calgary_reserve_regions(struct pci_dev *dev)
 724 {
 725         unsigned int npages;
 726         u64 start;
 727         struct iommu_table *tbl = pci_iommu(dev->bus);
 728
 729         /* reserve EMERGENCY_PAGES from bad_dma_address and up */
 730         iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
 731
 732         /* avoid the BIOS/VGA first 640KB-1MB region */
 733         /* for CalIOC2 - avoid the entire first MB */
 734         if (is_calgary(dev->device)) {
 735                 start = (640 * 1024);
 736                 npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
 737         } else { /* calioc2 */
 738                 start = 0;
 739                 npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
 740         }
 741         iommu_range_reserve(tbl, start, npages);
 742
 743         /* reserve the two PCI peripheral memory regions in IO space */
 744         calgary_reserve_peripheral_mem_1(dev);
 745         calgary_reserve_peripheral_mem_2(dev);
 746 }
 747
 748 static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
 749 {
 750         u64 val64;
 751         u64 table_phys;
 752         void __iomem *target;
 753         int ret;
 754         struct iommu_table *tbl;
 755
 756         /* build TCE tables for each PHB */
 757         ret = build_tce_table(dev, bbar);
 758         if (ret)
 759                 return ret;
 760
 761         tbl = pci_iommu(dev->bus);
 762         tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
 763
 764         if (is_kdump_kernel())
 765                 calgary_init_bitmap_from_tce_table(tbl);
 766         else
 767                 tce_free(tbl, 0, tbl->it_size);
 768
 769         if (is_calgary(dev->device))
 770                 tbl->chip_ops = &calgary_chip_ops;
 771         else if (is_calioc2(dev->device))
 772                 tbl->chip_ops = &calioc2_chip_ops;
 773         else
 774                 BUG();
 775
 776         calgary_reserve_regions(dev);
 777
 778         /* set TARs for each PHB */
 779         target = calgary_reg(bbar, tar_offset(dev->bus->number));
 780         val64 = be64_to_cpu(readq(target));
 781
 782         /* zero out all TAR bits under sw control */
 783         val64 &= ~TAR_SW_BITS;
 784         table_phys = (u64)__pa(tbl->it_base);
 785
 786         val64 |= table_phys;
 787
 788         BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
 789         val64 |= (u64) specified_table_size;
 790
 791         tbl->tar_val = cpu_to_be64(val64);
 792
 793         writeq(tbl->tar_val, target);
 794         readq(target); /* flush */
 795
 796         return 0;
 797 }
 798
 799 static void __init calgary_free_bus(struct pci_dev *dev)
 800 {
 801         u64 val64;
 802         struct iommu_table *tbl = pci_iommu(dev->bus);
 803         void __iomem *target;
 804         unsigned int bitmapsz;
 805
 806         target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
 807         val64 = be64_to_cpu(readq(target));
 808         val64 &= ~TAR_SW_BITS;
 809         writeq(cpu_to_be64(val64), target);
 810         readq(target); /* flush */
 811
 812         bitmapsz = tbl->it_size / BITS_PER_BYTE;
 813         free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
 814         tbl->it_map = NULL;
 815
 816         kfree(tbl);
 817
 818         set_pci_iommu(dev->bus, NULL);
 819
 820         /* Can't free bootmem allocated memory after system is up :-( */
 821         bus_info[dev->bus->number].tce_space = NULL;
 822 }
 823
 824 static void calgary_dump_error_regs(struct iommu_table *tbl)
 825 {
 826         void __iomem *bbar = tbl->bbar;
 827         void __iomem *target;
 828         u32 csr, plssr;
 829
 830         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
 831         csr = be32_to_cpu(readl(target));
 832
 833         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
 834         plssr = be32_to_cpu(readl(target));
 835
 836         /* If no error, the agent ID in the CSR is not valid */
 837         printk(KERN_EMERG "Calgary: DMA error on Calgary PHB 0x%x, "
 838                "0x%08x@CSR 0x%08x@PLSSR\n", tbl->it_busno, csr, plssr);
 839 }
 840
 841 static void calioc2_dump_error_regs(struct iommu_table *tbl)
 842 {
 843         void __iomem *bbar = tbl->bbar;
 844         u32 csr, csmr, plssr, mck, rcstat;
 845         void __iomem *target;
 846         unsigned long phboff = phb_offset(tbl->it_busno);
 847         unsigned long erroff;
 848         u32 errregs[7];
 849         int i;
 850
 851         /* dump CSR */
 852         target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
 853         csr = be32_to_cpu(readl(target));
 854         /* dump PLSSR */
 855         target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
 856         plssr = be32_to_cpu(readl(target));
 857         /* dump CSMR */
 858         target = calgary_reg(bbar, phboff | 0x290);
 859         csmr = be32_to_cpu(readl(target));
 860         /* dump mck */
 861         target = calgary_reg(bbar, phboff | 0x800);
 862         mck = be32_to_cpu(readl(target));
 863
 864         printk(KERN_EMERG "Calgary: DMA error on CalIOC2 PHB 0x%x\n",
 865                tbl->it_busno);
 866
 867         printk(KERN_EMERG "Calgary: 0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
 868                csr, plssr, csmr, mck);
 869
 870         /* dump rest of error regs */
 871         printk(KERN_EMERG "Calgary: ");
 872         for (i = 0; i < ARRAY_SIZE(errregs); i++) {
 873                 /* err regs are at 0x810 - 0x870 */
 874                 erroff = (0x810 + (i * 0x10));
 875                 target = calgary_reg(bbar, phboff | erroff);
 876                 errregs[i] = be32_to_cpu(readl(target));
 877                 printk("0x%08x@0x%lx ", errregs[i], erroff);
 878         }
 879         printk("\n");
 880
 881         /* root complex status */
 882         target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
 883         rcstat = be32_to_cpu(readl(target));
 884         printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
 885                PHB_ROOT_COMPLEX_STATUS);
 886 }
 887
 888 static void calgary_watchdog(unsigned long data)
 889 {
 890         struct pci_dev *dev = (struct pci_dev *)data;
 891         struct iommu_table *tbl = pci_iommu(dev->bus);
 892         void __iomem *bbar = tbl->bbar;
 893         u32 val32;
 894         void __iomem *target;
 895
 896         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
 897         val32 = be32_to_cpu(readl(target));
 898
 899         /* If no error, the agent ID in the CSR is not valid */
 900         if (val32 & CSR_AGENT_MASK) {
 901                 tbl->chip_ops->dump_error_regs(tbl);
 902
 903                 /* reset error */
 904                 writel(0, target);
 905
 906                 /* Disable bus that caused the error */
 907                 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
 908                                      PHB_CONFIG_RW_OFFSET);
 909                 val32 = be32_to_cpu(readl(target));
 910                 val32 |= PHB_SLOT_DISABLE;
 911                 writel(cpu_to_be32(val32), target);
 912                 readl(target); /* flush */
 913         } else {
 914                 /* Reset the timer */
 915                 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
 916         }
 917 }
 918
 919 static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
 920         unsigned char busnum, unsigned long timeout)
 921 {
 922         u64 val64;
 923         void __iomem *target;
 924         unsigned int phb_shift = ~0; /* silence gcc */
 925         u64 mask;
 926
 927         switch (busno_to_phbid(busnum)) {
 928         case 0: phb_shift = (63 - 19);
 929                 break;
 930         case 1: phb_shift = (63 - 23);
 931                 break;
 932         case 2: phb_shift = (63 - 27);
 933                 break;
 934         case 3: phb_shift = (63 - 35);
 935                 break;
 936         default:
 937                 BUG_ON(busno_to_phbid(busnum));
 938         }
 939
 940         target = calgary_reg(bbar, CALGARY_CONFIG_REG);
 941         val64 = be64_to_cpu(readq(target));
 942
 943         /* zero out this PHB's timer bits */
 944         mask = ~(0xFUL << phb_shift);
 945         val64 &= mask;
 946         val64 |= (timeout << phb_shift);
 947         writeq(cpu_to_be64(val64), target);
 948         readq(target); /* flush */
 949 }
 950
 951 static void __init calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
 952 {
 953         unsigned char busnum = dev->bus->number;
 954         void __iomem *bbar = tbl->bbar;
 955         void __iomem *target;
 956         u32 val;
 957
 958         /*
 959          * CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
 960          */
 961         target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
 962         val = cpu_to_be32(readl(target));
 963         val |= 0x00800000;
 964         writel(cpu_to_be32(val), target);
 965 }
 966
 967 static void __init calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
 968 {
 969         unsigned char busnum = dev->bus->number;
 970
 971         /*
 972          * Give split completion a longer timeout on bus 1 for aic94xx
 973          * http://bugzilla.kernel.org/show_bug.cgi?id=7180
 974          */
 975         if (is_calgary(dev->device) && (busnum == 1))
 976                 calgary_set_split_completion_timeout(tbl->bbar, busnum,
 977                                                      CCR_2SEC_TIMEOUT);
 978 }
 979
 980 static void __init calgary_enable_translation(struct pci_dev *dev)
 981 {
 982         u32 val32;
 983         unsigned char busnum;
 984         void __iomem *target;
 985         void __iomem *bbar;
 986         struct iommu_table *tbl;
 987
 988         busnum = dev->bus->number;
 989         tbl = pci_iommu(dev->bus);
 990         bbar = tbl->bbar;
 991
 992         /* enable TCE in PHB Config Register */
 993         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 994         val32 = be32_to_cpu(readl(target));
 995         val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
 996
 997         printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
 998                (dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
 999                "Calgary" : "CalIOC2", busnum);
1000         printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
1001                "bus.\n");
1002
1003         writel(cpu_to_be32(val32), target);
1004         readl(target); /* flush */
1005
1006         init_timer(&tbl->watchdog_timer);
1007         tbl->watchdog_timer.function = &calgary_watchdog;
1008         tbl->watchdog_timer.data = (unsigned long)dev;
1009         mod_timer(&tbl->watchdog_timer, jiffies);
1010 }
1011
1012 static void __init calgary_disable_translation(struct pci_dev *dev)
1013 {
1014         u32 val32;
1015         unsigned char busnum;
1016         void __iomem *target;
1017         void __iomem *bbar;
1018         struct iommu_table *tbl;
1019
1020         busnum = dev->bus->number;
1021         tbl = pci_iommu(dev->bus);
1022         bbar = tbl->bbar;
1023
1024         /* disable TCE in PHB Config Register */
1025         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
1026         val32 = be32_to_cpu(readl(target));
1027         val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
1028
1029         printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
1030         writel(cpu_to_be32(val32), target);
1031         readl(target); /* flush */
1032
1033         del_timer_sync(&tbl->watchdog_timer);
1034 }
1035
1036 static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
1037 {
1038         pci_dev_get(dev);
1039         set_pci_iommu(dev->bus, NULL);
1040
1041         /* is the device behind a bridge? */
1042         if (dev->bus->parent)
1043                 dev->bus->parent->self = dev;
1044         else
1045                 dev->bus->self = dev;
1046 }
1047
1048 static int __init calgary_init_one(struct pci_dev *dev)
1049 {
1050         void __iomem *bbar;
1051         struct iommu_table *tbl;
1052         int ret;
1053
1054         BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
1055
1056         bbar = busno_to_bbar(dev->bus->number);
1057         ret = calgary_setup_tar(dev, bbar);
1058         if (ret)
1059                 goto done;
1060
1061         pci_dev_get(dev);
1062
1063         if (dev->bus->parent) {
1064                 if (dev->bus->parent->self)
1065                         printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
1066                                "bus->parent->self!\n", dev);
1067                 dev->bus->parent->self = dev;
1068         } else
1069                 dev->bus->self = dev;
1070
1071         tbl = pci_iommu(dev->bus);
1072         tbl->chip_ops->handle_quirks(tbl, dev);
1073
1074         calgary_enable_translation(dev);
1075
1076         return 0;
1077
1078 done:
1079         return ret;
1080 }
1081
1082 static int __init calgary_locate_bbars(void)
1083 {
1084         int ret;
1085         int rioidx, phb, bus;
1086         void __iomem *bbar;
1087         void __iomem *target;
1088         unsigned long offset;
1089         u8 start_bus, end_bus;
1090         u32 val;
1091
1092         ret = -ENODATA;
1093         for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
1094                 struct rio_detail *rio = rio_devs[rioidx];
1095
1096                 if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
1097                         continue;
1098
1099                 /* map entire 1MB of Calgary config space */
1100                 bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
1101                 if (!bbar)
1102                         goto error;
1103
1104                 for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
1105                         offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
1106                         target = calgary_reg(bbar, offset);
1107
1108                         val = be32_to_cpu(readl(target));
1109
1110                         start_bus = (u8)((val & 0x00FF0000) >> 16);
1111                         end_bus = (u8)((val & 0x0000FF00) >> 8);
1112
1113                         if (end_bus) {
1114                                 for (bus = start_bus; bus <= end_bus; bus++) {
1115                                         bus_info[bus].bbar = bbar;
1116                                         bus_info[bus].phbid = phb;
1117                                 }
1118                         } else {
1119                                 bus_info[start_bus].bbar = bbar;
1120                                 bus_info[start_bus].phbid = phb;
1121                         }
1122                 }
1123         }
1124
1125         return 0;
1126
1127 error:
1128         /* scan bus_info and iounmap any bbars we previously ioremap'd */
1129         for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
1130                 if (bus_info[bus].bbar)
1131                         iounmap(bus_info[bus].bbar);
1132
1133         return ret;
1134 }
1135
1136 static int __init calgary_init(void)
1137 {
1138         int ret;
1139         struct pci_dev *dev = NULL;
1140         struct calgary_bus_info *info;
1141
1142         ret = calgary_locate_bbars();
1143         if (ret)
1144                 return ret;
1145
1146         /* Purely for kdump kernel case */
1147         if (is_kdump_kernel())
1148                 get_tce_space_from_tar();
1149
1150         do {
1151                 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1152                 if (!dev)
1153                         break;
1154                 if (!is_cal_pci_dev(dev->device))
1155                         continue;
1156
1157                 info = &bus_info[dev->bus->number];
1158                 if (info->translation_disabled) {
1159                         calgary_init_one_nontraslated(dev);
1160                         continue;
1161                 }
1162
1163                 if (!info->tce_space && !translate_empty_slots)
1164                         continue;
1165
1166                 ret = calgary_init_one(dev);
1167                 if (ret)
1168                         goto error;
1169         } while (1);
1170
1171         dev = NULL;
1172         for_each_pci_dev(dev) {
1173                 struct iommu_table *tbl;
1174
1175                 tbl = find_iommu_table(&dev->dev);
1176
1177                 if (translation_enabled(tbl))
1178                         dev->dev.archdata.dma_ops = &calgary_dma_ops;
1179         }
1180
1181         return ret;
1182
1183 error:
1184         do {
1185                 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1186                 if (!dev)
1187                         break;
1188                 if (!is_cal_pci_dev(dev->device))
1189                         continue;
1190
1191                 info = &bus_info[dev->bus->number];
1192                 if (info->translation_disabled) {
1193                         pci_dev_put(dev);
1194                         continue;
1195                 }
1196                 if (!info->tce_space && !translate_empty_slots)
1197                         continue;
1198
1199                 calgary_disable_translation(dev);
1200                 calgary_free_bus(dev);
1201                 pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
1202                 dev->dev.archdata.dma_ops = NULL;
1203         } while (1);
1204
1205         return ret;
1206 }
1207
1208 static inline int __init determine_tce_table_size(u64 ram)
1209 {
1210         int ret;
1211
1212         if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
1213                 return specified_table_size;
1214
1215         /*
1216          * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
1217          * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
1218          * larger table size has twice as many entries, so shift the
1219          * max ram address by 13 to divide by 8K and then look at the
1220          * order of the result to choose between 0-7.
1221          */
1222         ret = get_order(ram >> 13);
1223         if (ret > TCE_TABLE_SIZE_8M)
1224                 ret = TCE_TABLE_SIZE_8M;
1225
1226         return ret;
1227 }
1228
1229 static int __init build_detail_arrays(void)
1230 {
1231         unsigned long ptr;
1232         unsigned numnodes, i;
1233         int scal_detail_size, rio_detail_size;
1234
1235         numnodes = rio_table_hdr->num_scal_dev;
1236         if (numnodes > MAX_NUMNODES){
1237                 printk(KERN_WARNING
1238                         "Calgary: MAX_NUMNODES too low! Defined as %d, "
1239                         "but system has %d nodes.\n",
1240                         MAX_NUMNODES, numnodes);
1241                 return -ENODEV;
1242         }
1243
1244         switch (rio_table_hdr->version){
1245         case 2:
1246                 scal_detail_size = 11;
1247                 rio_detail_size = 13;
1248                 break;
1249         case 3:
1250                 scal_detail_size = 12;
1251                 rio_detail_size = 15;
1252                 break;
1253         default:
1254                 printk(KERN_WARNING
1255                        "Calgary: Invalid Rio Grande Table Version: %d\n",
1256                        rio_table_hdr->version);
1257                 return -EPROTO;
1258         }
1259
1260         ptr = ((unsigned long)rio_table_hdr) + 3;
1261         for (i = 0; i < numnodes; i++, ptr += scal_detail_size)
1262                 scal_devs[i] = (struct scal_detail *)ptr;
1263
1264         for (i = 0; i < rio_table_hdr->num_rio_dev;
1265                     i++, ptr += rio_detail_size)
1266                 rio_devs[i] = (struct rio_detail *)ptr;
1267
1268         return 0;
1269 }
1270
1271 static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
1272 {
1273         int dev;
1274         u32 val;
1275
1276         if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
1277                 /*
1278                  * FIXME: properly scan for devices accross the
1279                  * PCI-to-PCI bridge on every CalIOC2 port.
1280                  */
1281                 return 1;
1282         }
1283
1284         for (dev = 1; dev < 8; dev++) {
1285                 val = read_pci_config(bus, dev, 0, 0);
1286                 if (val != 0xffffffff)
1287                         break;
1288         }
1289         return (val != 0xffffffff);
1290 }
1291
1292 /*
1293  * calgary_init_bitmap_from_tce_table():
1294  * Funtion for kdump case. In the second/kdump kernel initialize
1295  * the bitmap based on the tce table entries obtained from first kernel
1296  */
1297 static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl)
1298 {
1299         u64 *tp;
1300         unsigned int index;
1301         tp = ((u64 *)tbl->it_base);
1302         for (index = 0 ; index < tbl->it_size; index++) {
1303                 if (*tp != 0x0)
1304                         set_bit(index, tbl->it_map);
1305                 tp++;
1306         }
1307 }
1308
1309 /*
1310  * get_tce_space_from_tar():
1311  * Function for kdump case. Get the tce tables from first kernel
1312  * by reading the contents of the base adress register of calgary iommu
1313  */
1314 static void __init get_tce_space_from_tar(void)
1315 {
1316         int bus;
1317         void __iomem *target;
1318         unsigned long tce_space;
1319
1320         for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1321                 struct calgary_bus_info *info = &bus_info[bus];
1322                 unsigned short pci_device;
1323                 u32 val;
1324
1325                 val = read_pci_config(bus, 0, 0, 0);
1326                 pci_device = (val & 0xFFFF0000) >> 16;
1327
1328                 if (!is_cal_pci_dev(pci_device))
1329                         continue;
1330                 if (info->translation_disabled)
1331                         continue;
1332
1333                 if (calgary_bus_has_devices(bus, pci_device) ||
1334                                                 translate_empty_slots) {
1335                         target = calgary_reg(bus_info[bus].bbar,
1336                                                 tar_offset(bus));
1337                         tce_space = be64_to_cpu(readq(target));
1338                         tce_space = tce_space & TAR_SW_BITS;
1339
1340                         tce_space = tce_space & (~specified_table_size);
1341                         info->tce_space = (u64 *)__va(tce_space);
1342                 }
1343         }
1344         return;
1345 }
1346
1347 void __init detect_calgary(void)
1348 {
1349         int bus;
1350         void *tbl;
1351         int calgary_found = 0;
1352         unsigned long ptr;
1353         unsigned int offset, prev_offset;
1354         int ret;
1355
1356         /*
1357          * if the user specified iommu=off or iommu=soft or we found
1358          * another HW IOMMU already, bail out.
1359          */
1360         if (swiotlb || no_iommu || iommu_detected)
1361                 return;
1362
1363         if (!use_calgary)
1364                 return;
1365
1366         if (!early_pci_allowed())
1367                 return;
1368
1369         printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
1370
1371         ptr = (unsigned long)phys_to_virt(get_bios_ebda());
1372
1373         rio_table_hdr = NULL;
1374         prev_offset = 0;
1375         offset = 0x180;
1376         /*
1377          * The next offset is stored in the 1st word.
1378          * Only parse up until the offset increases:
1379          */
1380         while (offset > prev_offset) {
1381                 /* The block id is stored in the 2nd word */
1382                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
1383                         /* set the pointer past the offset & block id */
1384                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
1385                         break;
1386                 }
1387                 prev_offset = offset;
1388                 offset = *((unsigned short *)(ptr + offset));
1389         }
1390         if (!rio_table_hdr) {
1391                 printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
1392                        "in EBDA - bailing!\n");
1393                 return;
1394         }
1395
1396         ret = build_detail_arrays();
1397         if (ret) {
1398                 printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
1399                 return;
1400         }
1401
1402         specified_table_size = determine_tce_table_size((is_kdump_kernel() ?
1403                                         saved_max_pfn : max_pfn) * PAGE_SIZE);
1404
1405         for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
1406                 struct calgary_bus_info *info = &bus_info[bus];
1407                 unsigned short pci_device;
1408                 u32 val;
1409
1410                 val = read_pci_config(bus, 0, 0, 0);
1411                 pci_device = (val & 0xFFFF0000) >> 16;
1412
1413                 if (!is_cal_pci_dev(pci_device))
1414                         continue;
1415
1416                 if (info->translation_disabled)
1417                         continue;
1418
1419                 if (calgary_bus_has_devices(bus, pci_device) ||
1420                     translate_empty_slots) {
1421                         /*
1422                          * If it is kdump kernel, find and use tce tables
1423                          * from first kernel, else allocate tce tables here
1424                          */
1425                         if (!is_kdump_kernel()) {
1426                                 tbl = alloc_tce_table();
1427                                 if (!tbl)
1428                                         goto cleanup;
1429                                 info->tce_space = tbl;
1430                         }
1431                         calgary_found = 1;
1432                 }
1433         }
1434
1435         printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
1436                calgary_found ? "found" : "not found");
1437
1438         if (calgary_found) {
1439                 iommu_detected = 1;
1440                 calgary_detected = 1;
1441                 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
1442                 printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d\n",
1443                        specified_table_size);
1444
1445                 /* swiotlb for devices that aren't behind the Calgary. */
1446                 if (max_pfn > MAX_DMA32_PFN)
1447                         swiotlb = 1;
1448         }
1449         return;
1450
1451 cleanup:
1452         for (--bus; bus >= 0; --bus) {
1453                 struct calgary_bus_info *info = &bus_info[bus];
1454
1455                 if (info->tce_space)
1456                         free_tce_table(info->tce_space);
1457         }
1458 }
1459
1460 int __init calgary_iommu_init(void)
1461 {
1462         int ret;
1463
1464         if (no_iommu || (swiotlb && !calgary_detected))
1465                 return -ENODEV;
1466
1467         if (!calgary_detected)
1468                 return -ENODEV;
1469
1470         /* ok, we're trying to use Calgary - let's roll */
1471         printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
1472
1473         ret = calgary_init();
1474         if (ret) {
1475                 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
1476                        "falling back to no_iommu\n", ret);
1477                 return ret;
1478         }
1479
1480         force_iommu = 1;
1481         bad_dma_address = 0x0;
1482         /* dma_ops is set to swiotlb or nommu */
1483         if (!dma_ops)
1484                 dma_ops = &nommu_dma_ops;
1485
1486         return 0;
1487 }
1488
1489 static int __init calgary_parse_options(char *p)
1490 {
1491         unsigned int bridge;
1492         size_t len;
1493         char* endp;
1494
1495         while (*p) {
1496                 if (!strncmp(p, "64k", 3))
1497                         specified_table_size = TCE_TABLE_SIZE_64K;
1498                 else if (!strncmp(p, "128k", 4))
1499                         specified_table_size = TCE_TABLE_SIZE_128K;
1500                 else if (!strncmp(p, "256k", 4))
1501                         specified_table_size = TCE_TABLE_SIZE_256K;
1502                 else if (!strncmp(p, "512k", 4))
1503                         specified_table_size = TCE_TABLE_SIZE_512K;
1504                 else if (!strncmp(p, "1M", 2))
1505                         specified_table_size = TCE_TABLE_SIZE_1M;
1506                 else if (!strncmp(p, "2M", 2))
1507                         specified_table_size = TCE_TABLE_SIZE_2M;
1508                 else if (!strncmp(p, "4M", 2))
1509                         specified_table_size = TCE_TABLE_SIZE_4M;
1510                 else if (!strncmp(p, "8M", 2))
1511                         specified_table_size = TCE_TABLE_SIZE_8M;
1512
1513                 len = strlen("translate_empty_slots");
1514                 if (!strncmp(p, "translate_empty_slots", len))
1515                         translate_empty_slots = 1;
1516
1517                 len = strlen("disable");
1518                 if (!strncmp(p, "disable", len)) {
1519                         p += len;
1520                         if (*p == '=')
1521                                 ++p;
1522                         if (*p == '\0')
1523                                 break;
1524                         bridge = simple_strtoul(p, &endp, 0);
1525                         if (p == endp)
1526                                 break;
1527
1528                         if (bridge < MAX_PHB_BUS_NUM) {
1529                                 printk(KERN_INFO "Calgary: disabling "
1530                                        "translation for PHB %#x\n", bridge);
1531                                 bus_info[bridge].translation_disabled = 1;
1532                         }
1533                 }
1534
1535                 p = strpbrk(p, ",");
1536                 if (!p)
1537                         break;
1538
1539                 p++; /* skip ',' */
1540         }
1541         return 1;
1542 }
1543 __setup("calgary=", calgary_parse_options);
1544
1545 static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
1546 {
1547         struct iommu_table *tbl;
1548         unsigned int npages;
1549         int i;
1550
1551         tbl = pci_iommu(dev->bus);
1552
1553         for (i = 0; i < 4; i++) {
1554                 struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
1555
1556                 /* Don't give out TCEs that map MEM resources */
1557                 if (!(r->flags & IORESOURCE_MEM))
1558                         continue;
1559
1560                 /* 0-based? we reserve the whole 1st MB anyway */
1561                 if (!r->start)
1562                         continue;
1563
1564                 /* cover the whole region */
1565                 npages = (r->end - r->start) >> PAGE_SHIFT;
1566                 npages++;
1567
1568                 iommu_range_reserve(tbl, r->start, npages);
1569         }
1570 }
1571
1572 static int __init calgary_fixup_tce_spaces(void)
1573 {
1574         struct pci_dev *dev = NULL;
1575         struct calgary_bus_info *info;
1576
1577         if (no_iommu || swiotlb || !calgary_detected)
1578                 return -ENODEV;
1579
1580         printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
1581
1582         do {
1583                 dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
1584                 if (!dev)
1585                         break;
1586                 if (!is_cal_pci_dev(dev->device))
1587                         continue;
1588
1589                 info = &bus_info[dev->bus->number];
1590                 if (info->translation_disabled)
1591                         continue;
1592
1593                 if (!info->tce_space)
1594                         continue;
1595
1596                 calgary_fixup_one_tce_space(dev);
1597
1598         } while (1);
1599
1600         return 0;
1601 }
1602
1603 /*
1604  * We need to be call after pcibios_assign_resources (fs_initcall level)
1605  * and before device_initcall.
1606  */
1607 rootfs_initcall(calgary_fixup_tce_spaces);