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   1 /*
   2  * Derived from arch/powerpc/kernel/iommu.c
   3  *
   4  * Copyright (C) 2006 Jon Mason <jdmason@us.ibm.com>, IBM Corporation
   5  * Copyright (C) 2006 Muli Ben-Yehuda <muli@il.ibm.com>, IBM Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  */
  21
  22 #include <linux/config.h>
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/types.h>
  26 #include <linux/slab.h>
  27 #include <linux/mm.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/string.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/init.h>
  32 #include <linux/bitops.h>
  33 #include <linux/pci_ids.h>
  34 #include <linux/pci.h>
  35 #include <linux/delay.h>
  36 #include <asm/proto.h>
  37 #include <asm/calgary.h>
  38 #include <asm/tce.h>
  39 #include <asm/pci-direct.h>
  40 #include <asm/system.h>
  41 #include <asm/dma.h>
  42
  43 #define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
  44 #define PCI_VENDOR_DEVICE_ID_CALGARY \
  45         (PCI_VENDOR_ID_IBM | PCI_DEVICE_ID_IBM_CALGARY << 16)
  46
  47 /* we need these for register space address calculation */
  48 #define START_ADDRESS           0xfe000000
  49 #define CHASSIS_BASE            0
  50 #define ONE_BASED_CHASSIS_NUM   1
  51
  52 /* register offsets inside the host bridge space */
  53 #define PHB_CSR_OFFSET          0x0110
  54 #define PHB_PLSSR_OFFSET        0x0120
  55 #define PHB_CONFIG_RW_OFFSET    0x0160
  56 #define PHB_IOBASE_BAR_LOW      0x0170
  57 #define PHB_IOBASE_BAR_HIGH     0x0180
  58 #define PHB_MEM_1_LOW           0x0190
  59 #define PHB_MEM_1_HIGH          0x01A0
  60 #define PHB_IO_ADDR_SIZE        0x01B0
  61 #define PHB_MEM_1_SIZE          0x01C0
  62 #define PHB_MEM_ST_OFFSET       0x01D0
  63 #define PHB_AER_OFFSET          0x0200
  64 #define PHB_CONFIG_0_HIGH       0x0220
  65 #define PHB_CONFIG_0_LOW        0x0230
  66 #define PHB_CONFIG_0_END        0x0240
  67 #define PHB_MEM_2_LOW           0x02B0
  68 #define PHB_MEM_2_HIGH          0x02C0
  69 #define PHB_MEM_2_SIZE_HIGH     0x02D0
  70 #define PHB_MEM_2_SIZE_LOW      0x02E0
  71 #define PHB_DOSHOLE_OFFSET      0x08E0
  72
  73 /* PHB_CONFIG_RW */
  74 #define PHB_TCE_ENABLE          0x20000000
  75 #define PHB_SLOT_DISABLE        0x1C000000
  76 #define PHB_DAC_DISABLE         0x01000000
  77 #define PHB_MEM2_ENABLE         0x00400000
  78 #define PHB_MCSR_ENABLE         0x00100000
  79 /* TAR (Table Address Register) */
  80 #define TAR_SW_BITS             0x0000ffffffff800fUL
  81 #define TAR_VALID               0x0000000000000008UL
  82 /* CSR (Channel/DMA Status Register) */
  83 #define CSR_AGENT_MASK          0xffe0ffff
  84
  85 #define MAX_NUM_OF_PHBS         8 /* how many PHBs in total? */
  86 #define MAX_PHB_BUS_NUM         (MAX_NUM_OF_PHBS * 2) /* max dev->bus->number */
  87 #define PHBS_PER_CALGARY        4
  88
  89 /* register offsets in Calgary's internal register space */
  90 static const unsigned long tar_offsets[] = {
  91         0x0580 /* TAR0 */,
  92         0x0588 /* TAR1 */,
  93         0x0590 /* TAR2 */,
  94         0x0598 /* TAR3 */
  95 };
  96
  97 static const unsigned long split_queue_offsets[] = {
  98         0x4870 /* SPLIT QUEUE 0 */,
  99         0x5870 /* SPLIT QUEUE 1 */,
 100         0x6870 /* SPLIT QUEUE 2 */,
 101         0x7870 /* SPLIT QUEUE 3 */
 102 };
 103
 104 static const unsigned long phb_offsets[] = {
 105         0x8000 /* PHB0 */,
 106         0x9000 /* PHB1 */,
 107         0xA000 /* PHB2 */,
 108         0xB000 /* PHB3 */
 109 };
 110
 111 void* tce_table_kva[MAX_NUM_OF_PHBS * MAX_NUMNODES];
 112 unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
 113 static int translate_empty_slots __read_mostly = 0;
 114 static int calgary_detected __read_mostly = 0;
 115
 116 /*
 117  * the bitmap of PHBs the user requested that we disable
 118  * translation on.
 119  */
 120 static DECLARE_BITMAP(translation_disabled, MAX_NUMNODES * MAX_PHB_BUS_NUM);
 121
 122 static void tce_cache_blast(struct iommu_table *tbl);
 123
 124 /* enable this to stress test the chip's TCE cache */
 125 #ifdef CONFIG_IOMMU_DEBUG
 126 static inline void tce_cache_blast_stress(struct iommu_table *tbl)
 127 {
 128         tce_cache_blast(tbl);
 129 }
 130 #else
 131 static inline void tce_cache_blast_stress(struct iommu_table *tbl)
 132 {
 133 }
 134 #endif /* BLAST_TCE_CACHE_ON_UNMAP */
 135
 136 static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen)
 137 {
 138         unsigned int npages;
 139
 140         npages = PAGE_ALIGN(dma + dmalen) - (dma & PAGE_MASK);
 141         npages >>= PAGE_SHIFT;
 142
 143         return npages;
 144 }
 145
 146 static inline int translate_phb(struct pci_dev* dev)
 147 {
 148         int disabled = test_bit(dev->bus->number, translation_disabled);
 149         return !disabled;
 150 }
 151
 152 static void iommu_range_reserve(struct iommu_table *tbl,
 153         unsigned long start_addr, unsigned int npages)
 154 {
 155         unsigned long index;
 156         unsigned long end;
 157
 158         index = start_addr >> PAGE_SHIFT;
 159
 160         /* bail out if we're asked to reserve a region we don't cover */
 161         if (index >= tbl->it_size)
 162                 return;
 163
 164         end = index + npages;
 165         if (end > tbl->it_size) /* don't go off the table */
 166                 end = tbl->it_size;
 167
 168         while (index < end) {
 169                 if (test_bit(index, tbl->it_map))
 170                         printk(KERN_ERR "Calgary: entry already allocated at "
 171                                "0x%lx tbl %p dma 0x%lx npages %u\n",
 172                                index, tbl, start_addr, npages);
 173                 ++index;
 174         }
 175         set_bit_string(tbl->it_map, start_addr >> PAGE_SHIFT, npages);
 176 }
 177
 178 static unsigned long iommu_range_alloc(struct iommu_table *tbl,
 179         unsigned int npages)
 180 {
 181         unsigned long offset;
 182
 183         BUG_ON(npages == 0);
 184
 185         offset = find_next_zero_string(tbl->it_map, tbl->it_hint,
 186                                        tbl->it_size, npages);
 187         if (offset == ~0UL) {
 188                 tce_cache_blast(tbl);
 189                 offset = find_next_zero_string(tbl->it_map, 0,
 190                                                tbl->it_size, npages);
 191                 if (offset == ~0UL) {
 192                         printk(KERN_WARNING "Calgary: IOMMU full.\n");
 193                         if (panic_on_overflow)
 194                                 panic("Calgary: fix the allocator.\n");
 195                         else
 196                                 return bad_dma_address;
 197                 }
 198         }
 199
 200         set_bit_string(tbl->it_map, offset, npages);
 201         tbl->it_hint = offset + npages;
 202         BUG_ON(tbl->it_hint > tbl->it_size);
 203
 204         return offset;
 205 }
 206
 207 static dma_addr_t iommu_alloc(struct iommu_table *tbl, void *vaddr,
 208         unsigned int npages, int direction)
 209 {
 210         unsigned long entry, flags;
 211         dma_addr_t ret = bad_dma_address;
 212
 213         spin_lock_irqsave(&tbl->it_lock, flags);
 214
 215         entry = iommu_range_alloc(tbl, npages);
 216
 217         if (unlikely(entry == bad_dma_address))
 218                 goto error;
 219
 220         /* set the return dma address */
 221         ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
 222
 223         /* put the TCEs in the HW table */
 224         tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
 225                   direction);
 226
 227         spin_unlock_irqrestore(&tbl->it_lock, flags);
 228
 229         return ret;
 230
 231 error:
 232         spin_unlock_irqrestore(&tbl->it_lock, flags);
 233         printk(KERN_WARNING "Calgary: failed to allocate %u pages in "
 234                "iommu %p\n", npages, tbl);
 235         return bad_dma_address;
 236 }
 237
 238 static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 239         unsigned int npages)
 240 {
 241         unsigned long entry;
 242         unsigned long i;
 243
 244         entry = dma_addr >> PAGE_SHIFT;
 245
 246         BUG_ON(entry + npages > tbl->it_size);
 247
 248         tce_free(tbl, entry, npages);
 249
 250         for (i = 0; i < npages; ++i) {
 251                 if (!test_bit(entry + i, tbl->it_map))
 252                         printk(KERN_ERR "Calgary: bit is off at 0x%lx "
 253                                "tbl %p dma 0x%Lx entry 0x%lx npages %u\n",
 254                                entry + i, tbl, dma_addr, entry, npages);
 255         }
 256
 257         __clear_bit_string(tbl->it_map, entry, npages);
 258
 259         tce_cache_blast_stress(tbl);
 260 }
 261
 262 static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 263         unsigned int npages)
 264 {
 265         unsigned long flags;
 266
 267         spin_lock_irqsave(&tbl->it_lock, flags);
 268
 269         __iommu_free(tbl, dma_addr, npages);
 270
 271         spin_unlock_irqrestore(&tbl->it_lock, flags);
 272 }
 273
 274 static void __calgary_unmap_sg(struct iommu_table *tbl,
 275         struct scatterlist *sglist, int nelems, int direction)
 276 {
 277         while (nelems--) {
 278                 unsigned int npages;
 279                 dma_addr_t dma = sglist->dma_address;
 280                 unsigned int dmalen = sglist->dma_length;
 281
 282                 if (dmalen == 0)
 283                         break;
 284
 285                 npages = num_dma_pages(dma, dmalen);
 286                 __iommu_free(tbl, dma, npages);
 287                 sglist++;
 288         }
 289 }
 290
 291 void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
 292                       int nelems, int direction)
 293 {
 294         unsigned long flags;
 295         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 296
 297         if (!translate_phb(to_pci_dev(dev)))
 298                 return;
 299
 300         spin_lock_irqsave(&tbl->it_lock, flags);
 301
 302         __calgary_unmap_sg(tbl, sglist, nelems, direction);
 303
 304         spin_unlock_irqrestore(&tbl->it_lock, flags);
 305 }
 306
 307 static int calgary_nontranslate_map_sg(struct device* dev,
 308         struct scatterlist *sg, int nelems, int direction)
 309 {
 310         int i;
 311
 312         for (i = 0; i < nelems; i++ ) {
 313                 struct scatterlist *s = &sg[i];
 314                 BUG_ON(!s->page);
 315                 s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
 316                 s->dma_length = s->length;
 317         }
 318         return nelems;
 319 }
 320
 321 int calgary_map_sg(struct device *dev, struct scatterlist *sg,
 322         int nelems, int direction)
 323 {
 324         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 325         unsigned long flags;
 326         unsigned long vaddr;
 327         unsigned int npages;
 328         unsigned long entry;
 329         int i;
 330
 331         if (!translate_phb(to_pci_dev(dev)))
 332                 return calgary_nontranslate_map_sg(dev, sg, nelems, direction);
 333
 334         spin_lock_irqsave(&tbl->it_lock, flags);
 335
 336         for (i = 0; i < nelems; i++ ) {
 337                 struct scatterlist *s = &sg[i];
 338                 BUG_ON(!s->page);
 339
 340                 vaddr = (unsigned long)page_address(s->page) + s->offset;
 341                 npages = num_dma_pages(vaddr, s->length);
 342
 343                 entry = iommu_range_alloc(tbl, npages);
 344                 if (entry == bad_dma_address) {
 345                         /* makes sure unmap knows to stop */
 346                         s->dma_length = 0;
 347                         goto error;
 348                 }
 349
 350                 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
 351
 352                 /* insert into HW table */
 353                 tce_build(tbl, entry, npages, vaddr & PAGE_MASK,
 354                           direction);
 355
 356                 s->dma_length = s->length;
 357         }
 358
 359         spin_unlock_irqrestore(&tbl->it_lock, flags);
 360
 361         return nelems;
 362 error:
 363         __calgary_unmap_sg(tbl, sg, nelems, direction);
 364         for (i = 0; i < nelems; i++) {
 365                 sg[i].dma_address = bad_dma_address;
 366                 sg[i].dma_length = 0;
 367         }
 368         spin_unlock_irqrestore(&tbl->it_lock, flags);
 369         return 0;
 370 }
 371
 372 dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
 373         size_t size, int direction)
 374 {
 375         dma_addr_t dma_handle = bad_dma_address;
 376         unsigned long uaddr;
 377         unsigned int npages;
 378         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 379
 380         uaddr = (unsigned long)vaddr;
 381         npages = num_dma_pages(uaddr, size);
 382
 383         if (translate_phb(to_pci_dev(dev)))
 384                 dma_handle = iommu_alloc(tbl, vaddr, npages, direction);
 385         else
 386                 dma_handle = virt_to_bus(vaddr);
 387
 388         return dma_handle;
 389 }
 390
 391 void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
 392         size_t size, int direction)
 393 {
 394         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 395         unsigned int npages;
 396
 397         if (!translate_phb(to_pci_dev(dev)))
 398                 return;
 399
 400         npages = num_dma_pages(dma_handle, size);
 401         iommu_free(tbl, dma_handle, npages);
 402 }
 403
 404 void* calgary_alloc_coherent(struct device *dev, size_t size,
 405         dma_addr_t *dma_handle, gfp_t flag)
 406 {
 407         void *ret = NULL;
 408         dma_addr_t mapping;
 409         unsigned int npages, order;
 410         struct iommu_table *tbl;
 411
 412         tbl = to_pci_dev(dev)->bus->self->sysdata;
 413
 414         size = PAGE_ALIGN(size); /* size rounded up to full pages */
 415         npages = size >> PAGE_SHIFT;
 416         order = get_order(size);
 417
 418         /* alloc enough pages (and possibly more) */
 419         ret = (void *)__get_free_pages(flag, order);
 420         if (!ret)
 421                 goto error;
 422         memset(ret, 0, size);
 423
 424         if (translate_phb(to_pci_dev(dev))) {
 425                 /* set up tces to cover the allocated range */
 426                 mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL);
 427                 if (mapping == bad_dma_address)
 428                         goto free;
 429
 430                 *dma_handle = mapping;
 431         } else /* non translated slot */
 432                 *dma_handle = virt_to_bus(ret);
 433
 434         return ret;
 435
 436 free:
 437         free_pages((unsigned long)ret, get_order(size));
 438         ret = NULL;
 439 error:
 440         return ret;
 441 }
 442
 443 static struct dma_mapping_ops calgary_dma_ops = {
 444         .alloc_coherent = calgary_alloc_coherent,
 445         .map_single = calgary_map_single,
 446         .unmap_single = calgary_unmap_single,
 447         .map_sg = calgary_map_sg,
 448         .unmap_sg = calgary_unmap_sg,
 449 };
 450
 451 static inline int busno_to_phbid(unsigned char num)
 452 {
 453         return bus_to_phb(num) % PHBS_PER_CALGARY;
 454 }
 455
 456 static inline unsigned long split_queue_offset(unsigned char num)
 457 {
 458         size_t idx = busno_to_phbid(num);
 459
 460         return split_queue_offsets[idx];
 461 }
 462
 463 static inline unsigned long tar_offset(unsigned char num)
 464 {
 465         size_t idx = busno_to_phbid(num);
 466
 467         return tar_offsets[idx];
 468 }
 469
 470 static inline unsigned long phb_offset(unsigned char num)
 471 {
 472         size_t idx = busno_to_phbid(num);
 473
 474         return phb_offsets[idx];
 475 }
 476
 477 static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
 478 {
 479         unsigned long target = ((unsigned long)bar) | offset;
 480         return (void __iomem*)target;
 481 }
 482
 483 static void tce_cache_blast(struct iommu_table *tbl)
 484 {
 485         u64 val;
 486         u32 aer;
 487         int i = 0;
 488         void __iomem *bbar = tbl->bbar;
 489         void __iomem *target;
 490
 491         /* disable arbitration on the bus */
 492         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 493         aer = readl(target);
 494         writel(0, target);
 495
 496         /* read plssr to ensure it got there */
 497         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
 498         val = readl(target);
 499
 500         /* poll split queues until all DMA activity is done */
 501         target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
 502         do {
 503                 val = readq(target);
 504                 i++;
 505         } while ((val & 0xff) != 0xff && i < 100);
 506         if (i == 100)
 507                 printk(KERN_WARNING "Calgary: PCI bus not quiesced, "
 508                        "continuing anyway\n");
 509
 510         /* invalidate TCE cache */
 511         target = calgary_reg(bbar, tar_offset(tbl->it_busno));
 512         writeq(tbl->tar_val, target);
 513
 514         /* enable arbitration */
 515         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 516         writel(aer, target);
 517         (void)readl(target); /* flush */
 518 }
 519
 520 static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
 521         u64 limit)
 522 {
 523         unsigned int numpages;
 524
 525         limit = limit | 0xfffff;
 526         limit++;
 527
 528         numpages = ((limit - start) >> PAGE_SHIFT);
 529         iommu_range_reserve(dev->sysdata, start, numpages);
 530 }
 531
 532 static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
 533 {
 534         void __iomem *target;
 535         u64 low, high, sizelow;
 536         u64 start, limit;
 537         struct iommu_table *tbl = dev->sysdata;
 538         unsigned char busnum = dev->bus->number;
 539         void __iomem *bbar = tbl->bbar;
 540
 541         /* peripheral MEM_1 region */
 542         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
 543         low = be32_to_cpu(readl(target));
 544         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
 545         high = be32_to_cpu(readl(target));
 546         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
 547         sizelow = be32_to_cpu(readl(target));
 548
 549         start = (high << 32) | low;
 550         limit = sizelow;
 551
 552         calgary_reserve_mem_region(dev, start, limit);
 553 }
 554
 555 static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
 556 {
 557         void __iomem *target;
 558         u32 val32;
 559         u64 low, high, sizelow, sizehigh;
 560         u64 start, limit;
 561         struct iommu_table *tbl = dev->sysdata;
 562         unsigned char busnum = dev->bus->number;
 563         void __iomem *bbar = tbl->bbar;
 564
 565         /* is it enabled? */
 566         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 567         val32 = be32_to_cpu(readl(target));
 568         if (!(val32 & PHB_MEM2_ENABLE))
 569                 return;
 570
 571         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
 572         low = be32_to_cpu(readl(target));
 573         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
 574         high = be32_to_cpu(readl(target));
 575         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
 576         sizelow = be32_to_cpu(readl(target));
 577         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
 578         sizehigh = be32_to_cpu(readl(target));
 579
 580         start = (high << 32) | low;
 581         limit = (sizehigh << 32) | sizelow;
 582
 583         calgary_reserve_mem_region(dev, start, limit);
 584 }
 585
 586 /*
 587  * some regions of the IO address space do not get translated, so we
 588  * must not give devices IO addresses in those regions. The regions
 589  * are the 640KB-1MB region and the two PCI peripheral memory holes.
 590  * Reserve all of them in the IOMMU bitmap to avoid giving them out
 591  * later.
 592  */
 593 static void __init calgary_reserve_regions(struct pci_dev *dev)
 594 {
 595         unsigned int npages;
 596         void __iomem *bbar;
 597         unsigned char busnum;
 598         u64 start;
 599         struct iommu_table *tbl = dev->sysdata;
 600
 601         bbar = tbl->bbar;
 602         busnum = dev->bus->number;
 603
 604         /* reserve bad_dma_address in case it's a legal address */
 605         iommu_range_reserve(tbl, bad_dma_address, 1);
 606
 607         /* avoid the BIOS/VGA first 640KB-1MB region */
 608         start = (640 * 1024);
 609         npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
 610         iommu_range_reserve(tbl, start, npages);
 611
 612         /* reserve the two PCI peripheral memory regions in IO space */
 613         calgary_reserve_peripheral_mem_1(dev);
 614         calgary_reserve_peripheral_mem_2(dev);
 615 }
 616
 617 static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
 618 {
 619         u64 val64;
 620         u64 table_phys;
 621         void __iomem *target;
 622         int ret;
 623         struct iommu_table *tbl;
 624
 625         /* build TCE tables for each PHB */
 626         ret = build_tce_table(dev, bbar);
 627         if (ret)
 628                 return ret;
 629
 630         calgary_reserve_regions(dev);
 631
 632         /* set TARs for each PHB */
 633         target = calgary_reg(bbar, tar_offset(dev->bus->number));
 634         val64 = be64_to_cpu(readq(target));
 635
 636         /* zero out all TAR bits under sw control */
 637         val64 &= ~TAR_SW_BITS;
 638
 639         tbl = dev->sysdata;
 640         table_phys = (u64)__pa(tbl->it_base);
 641         val64 |= table_phys;
 642
 643         BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
 644         val64 |= (u64) specified_table_size;
 645
 646         tbl->tar_val = cpu_to_be64(val64);
 647         writeq(tbl->tar_val, target);
 648         readq(target); /* flush */
 649
 650         return 0;
 651 }
 652
 653 static void __init calgary_free_tar(struct pci_dev *dev)
 654 {
 655         u64 val64;
 656         struct iommu_table *tbl = dev->sysdata;
 657         void __iomem *target;
 658
 659         target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
 660         val64 = be64_to_cpu(readq(target));
 661         val64 &= ~TAR_SW_BITS;
 662         writeq(cpu_to_be64(val64), target);
 663         readq(target); /* flush */
 664
 665         kfree(tbl);
 666         dev->sysdata = NULL;
 667 }
 668
 669 static void calgary_watchdog(unsigned long data)
 670 {
 671         struct pci_dev *dev = (struct pci_dev *)data;
 672         struct iommu_table *tbl = dev->sysdata;
 673         void __iomem *bbar = tbl->bbar;
 674         u32 val32;
 675         void __iomem *target;
 676
 677         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
 678         val32 = be32_to_cpu(readl(target));
 679
 680         /* If no error, the agent ID in the CSR is not valid */
 681         if (val32 & CSR_AGENT_MASK) {
 682                 printk(KERN_EMERG "calgary_watchdog: DMA error on bus %d, "
 683                                   "CSR = %#x\n", dev->bus->number, val32);
 684                 writel(0, target);
 685
 686                 /* Disable bus that caused the error */
 687                 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
 688                                            PHB_CONFIG_RW_OFFSET);
 689                 val32 = be32_to_cpu(readl(target));
 690                 val32 |= PHB_SLOT_DISABLE;
 691                 writel(cpu_to_be32(val32), target);
 692                 readl(target); /* flush */
 693         } else {
 694                 /* Reset the timer */
 695                 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
 696         }
 697 }
 698
 699 static void __init calgary_enable_translation(struct pci_dev *dev)
 700 {
 701         u32 val32;
 702         unsigned char busnum;
 703         void __iomem *target;
 704         void __iomem *bbar;
 705         struct iommu_table *tbl;
 706
 707         busnum = dev->bus->number;
 708         tbl = dev->sysdata;
 709         bbar = tbl->bbar;
 710
 711         /* enable TCE in PHB Config Register */
 712         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 713         val32 = be32_to_cpu(readl(target));
 714         val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
 715
 716         printk(KERN_INFO "Calgary: enabling translation on PHB %d\n", busnum);
 717         printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
 718                "bus.\n");
 719
 720         writel(cpu_to_be32(val32), target);
 721         readl(target); /* flush */
 722
 723         init_timer(&tbl->watchdog_timer);
 724         tbl->watchdog_timer.function = &calgary_watchdog;
 725         tbl->watchdog_timer.data = (unsigned long)dev;
 726         mod_timer(&tbl->watchdog_timer, jiffies);
 727 }
 728
 729 static void __init calgary_disable_translation(struct pci_dev *dev)
 730 {
 731         u32 val32;
 732         unsigned char busnum;
 733         void __iomem *target;
 734         void __iomem *bbar;
 735         struct iommu_table *tbl;
 736
 737         busnum = dev->bus->number;
 738         tbl = dev->sysdata;
 739         bbar = tbl->bbar;
 740
 741         /* disable TCE in PHB Config Register */
 742         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 743         val32 = be32_to_cpu(readl(target));
 744         val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
 745
 746         printk(KERN_INFO "Calgary: disabling translation on PHB %d!\n", busnum);
 747         writel(cpu_to_be32(val32), target);
 748         readl(target); /* flush */
 749
 750         del_timer_sync(&tbl->watchdog_timer);
 751 }
 752
 753 static inline unsigned int __init locate_register_space(struct pci_dev *dev)
 754 {
 755         int rionodeid;
 756         u32 address;
 757
 758         rionodeid = (dev->bus->number % 15 > 4) ? 3 : 2;
 759         /*
 760          * register space address calculation as follows:
 761          * FE0MB-8MB*OneBasedChassisNumber+1MB*(RioNodeId-ChassisBase)
 762          * ChassisBase is always zero for x366/x260/x460
 763          * RioNodeId is 2 for first Calgary, 3 for second Calgary
 764          */
 765         address = START_ADDRESS -
 766                 (0x800000 * (ONE_BASED_CHASSIS_NUM + dev->bus->number / 15)) +
 767                 (0x100000) * (rionodeid - CHASSIS_BASE);
 768         return address;
 769 }
 770
 771 static int __init calgary_init_one_nontraslated(struct pci_dev *dev)
 772 {
 773         dev->sysdata = NULL;
 774         dev->bus->self = dev;
 775
 776         return 0;
 777 }
 778
 779 static int __init calgary_init_one(struct pci_dev *dev)
 780 {
 781         u32 address;
 782         void __iomem *bbar;
 783         int ret;
 784
 785         address = locate_register_space(dev);
 786         /* map entire 1MB of Calgary config space */
 787         bbar = ioremap_nocache(address, 1024 * 1024);
 788         if (!bbar) {
 789                 ret = -ENODATA;
 790                 goto done;
 791         }
 792
 793         ret = calgary_setup_tar(dev, bbar);
 794         if (ret)
 795                 goto iounmap;
 796
 797         dev->bus->self = dev;
 798         calgary_enable_translation(dev);
 799
 800         return 0;
 801
 802 iounmap:
 803         iounmap(bbar);
 804 done:
 805         return ret;
 806 }
 807
 808 static int __init calgary_init(void)
 809 {
 810         int i, ret = -ENODEV;
 811         struct pci_dev *dev = NULL;
 812
 813         for (i = 0; i <= num_online_nodes() * MAX_NUM_OF_PHBS; i++) {
 814                 dev = pci_get_device(PCI_VENDOR_ID_IBM,
 815                                      PCI_DEVICE_ID_IBM_CALGARY,
 816                                      dev);
 817                 if (!dev)
 818                         break;
 819                 if (!translate_phb(dev)) {
 820                         calgary_init_one_nontraslated(dev);
 821                         continue;
 822                 }
 823                 if (!tce_table_kva[i] && !translate_empty_slots) {
 824                         pci_dev_put(dev);
 825                         continue;
 826                 }
 827                 ret = calgary_init_one(dev);
 828                 if (ret)
 829                         goto error;
 830         }
 831
 832         return ret;
 833
 834 error:
 835         for (i--; i >= 0; i--) {
 836                 dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM,
 837                                               PCI_DEVICE_ID_IBM_CALGARY,
 838                                               dev);
 839                 if (!translate_phb(dev)) {
 840                         pci_dev_put(dev);
 841                         continue;
 842                 }
 843                 if (!tce_table_kva[i] && !translate_empty_slots)
 844                         continue;
 845                 calgary_disable_translation(dev);
 846                 calgary_free_tar(dev);
 847                 pci_dev_put(dev);
 848         }
 849
 850         return ret;
 851 }
 852
 853 static inline int __init determine_tce_table_size(u64 ram)
 854 {
 855         int ret;
 856
 857         if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
 858                 return specified_table_size;
 859
 860         /*
 861          * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
 862          * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
 863          * larger table size has twice as many entries, so shift the
 864          * max ram address by 13 to divide by 8K and then look at the
 865          * order of the result to choose between 0-7.
 866          */
 867         ret = get_order(ram >> 13);
 868         if (ret > TCE_TABLE_SIZE_8M)
 869                 ret = TCE_TABLE_SIZE_8M;
 870
 871         return ret;
 872 }
 873
 874 void __init detect_calgary(void)
 875 {
 876         u32 val;
 877         int bus, table_idx;
 878         void *tbl;
 879         int detected = 0;
 880
 881         /*
 882          * if the user specified iommu=off or iommu=soft or we found
 883          * another HW IOMMU already, bail out.
 884          */
 885         if (swiotlb || no_iommu || iommu_detected)
 886                 return;
 887
 888         specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
 889
 890         for (bus = 0, table_idx = 0;
 891              bus <= num_online_nodes() * MAX_PHB_BUS_NUM;
 892              bus++) {
 893                 BUG_ON(bus > MAX_NUMNODES * MAX_PHB_BUS_NUM);
 894                 if (read_pci_config(bus, 0, 0, 0) != PCI_VENDOR_DEVICE_ID_CALGARY)
 895                         continue;
 896                 if (test_bit(bus, translation_disabled)) {
 897                         printk(KERN_INFO "Calgary: translation is disabled for "
 898                                "PHB 0x%x\n", bus);
 899                         /* skip this phb, don't allocate a tbl for it */
 900                         tce_table_kva[table_idx] = NULL;
 901                         table_idx++;
 902                         continue;
 903                 }
 904                 /*
 905                  * scan the first slot of the PCI bus to see if there
 906                  * are any devices present
 907                  */
 908                 val = read_pci_config(bus, 1, 0, 0);
 909                 if (val != 0xffffffff || translate_empty_slots) {
 910                         tbl = alloc_tce_table();
 911                         if (!tbl)
 912                                 goto cleanup;
 913                         detected = 1;
 914                 } else
 915                         tbl = NULL;
 916
 917                 tce_table_kva[table_idx] = tbl;
 918                 table_idx++;
 919         }
 920
 921         if (detected) {
 922                 iommu_detected = 1;
 923                 calgary_detected = 1;
 924                 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected. "
 925                        "TCE table spec is %d.\n", specified_table_size);
 926         }
 927         return;
 928
 929 cleanup:
 930         for (--table_idx; table_idx >= 0; --table_idx)
 931                 if (tce_table_kva[table_idx])
 932                         free_tce_table(tce_table_kva[table_idx]);
 933 }
 934
 935 int __init calgary_iommu_init(void)
 936 {
 937         int ret;
 938
 939         if (no_iommu || swiotlb)
 940                 return -ENODEV;
 941
 942         if (!calgary_detected)
 943                 return -ENODEV;
 944
 945         /* ok, we're trying to use Calgary - let's roll */
 946         printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
 947
 948         ret = calgary_init();
 949         if (ret) {
 950                 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
 951                        "falling back to no_iommu\n", ret);
 952                 if (end_pfn > MAX_DMA32_PFN)
 953                         printk(KERN_ERR "WARNING more than 4GB of memory, "
 954                                         "32bit PCI may malfunction.\n");
 955                 return ret;
 956         }
 957
 958         force_iommu = 1;
 959         dma_ops = &calgary_dma_ops;
 960
 961         return 0;
 962 }
 963
 964 static int __init calgary_parse_options(char *p)
 965 {
 966         unsigned int bridge;
 967         size_t len;
 968         char* endp;
 969
 970         while (*p) {
 971                 if (!strncmp(p, "64k", 3))
 972                         specified_table_size = TCE_TABLE_SIZE_64K;
 973                 else if (!strncmp(p, "128k", 4))
 974                         specified_table_size = TCE_TABLE_SIZE_128K;
 975                 else if (!strncmp(p, "256k", 4))
 976                         specified_table_size = TCE_TABLE_SIZE_256K;
 977                 else if (!strncmp(p, "512k", 4))
 978                         specified_table_size = TCE_TABLE_SIZE_512K;
 979                 else if (!strncmp(p, "1M", 2))
 980                         specified_table_size = TCE_TABLE_SIZE_1M;
 981                 else if (!strncmp(p, "2M", 2))
 982                         specified_table_size = TCE_TABLE_SIZE_2M;
 983                 else if (!strncmp(p, "4M", 2))
 984                         specified_table_size = TCE_TABLE_SIZE_4M;
 985                 else if (!strncmp(p, "8M", 2))
 986                         specified_table_size = TCE_TABLE_SIZE_8M;
 987
 988                 len = strlen("translate_empty_slots");
 989                 if (!strncmp(p, "translate_empty_slots", len))
 990                         translate_empty_slots = 1;
 991
 992                 len = strlen("disable");
 993                 if (!strncmp(p, "disable", len)) {
 994                         p += len;
 995                         if (*p == '=')
 996                                 ++p;
 997                         if (*p == '\0')
 998                                 break;
 999                         bridge = simple_strtol(p, &endp, 0);
1000                         if (p == endp)
1001                                 break;
1002
1003                         if (bridge <= (num_online_nodes() * MAX_PHB_BUS_NUM)) {
1004                                 printk(KERN_INFO "Calgary: disabling "
1005                                        "translation for PHB 0x%x\n", bridge);
1006                                 set_bit(bridge, translation_disabled);
1007                         }
1008                 }
1009
1010                 p = strpbrk(p, ",");
1011                 if (!p)
1012                         break;
1013
1014                 p++; /* skip ',' */
1015         }
1016         return 1;
1017 }
1018 __setup("calgary=", calgary_parse_options);