arch/x86_64/kernel/pci-calgary.c

   1 /*
   2  * Derived from arch/powerpc/kernel/iommu.c
   3  *
   4  * Copyright (C) IBM Corporation, 2006
   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/dma-mapping.h>
  33 #include <linux/init.h>
  34 #include <linux/bitops.h>
  35 #include <linux/pci_ids.h>
  36 #include <linux/pci.h>
  37 #include <linux/delay.h>
  38 #include <asm/proto.h>
  39 #include <asm/calgary.h>
  40 #include <asm/tce.h>
  41 #include <asm/pci-direct.h>
  42 #include <asm/system.h>
  43 #include <asm/dma.h>
  44
  45 #define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
  46 #define PCI_VENDOR_DEVICE_ID_CALGARY \
  47         (PCI_VENDOR_ID_IBM | PCI_DEVICE_ID_IBM_CALGARY << 16)
  48
  49 /* we need these for register space address calculation */
  50 #define START_ADDRESS           0xfe000000
  51 #define CHASSIS_BASE            0
  52 #define ONE_BASED_CHASSIS_NUM   1
  53
  54 /* register offsets inside the host bridge space */
  55 #define PHB_CSR_OFFSET          0x0110
  56 #define PHB_PLSSR_OFFSET        0x0120
  57 #define PHB_CONFIG_RW_OFFSET    0x0160
  58 #define PHB_IOBASE_BAR_LOW      0x0170
  59 #define PHB_IOBASE_BAR_HIGH     0x0180
  60 #define PHB_MEM_1_LOW           0x0190
  61 #define PHB_MEM_1_HIGH          0x01A0
  62 #define PHB_IO_ADDR_SIZE        0x01B0
  63 #define PHB_MEM_1_SIZE          0x01C0
  64 #define PHB_MEM_ST_OFFSET       0x01D0
  65 #define PHB_AER_OFFSET          0x0200
  66 #define PHB_CONFIG_0_HIGH       0x0220
  67 #define PHB_CONFIG_0_LOW        0x0230
  68 #define PHB_CONFIG_0_END        0x0240
  69 #define PHB_MEM_2_LOW           0x02B0
  70 #define PHB_MEM_2_HIGH          0x02C0
  71 #define PHB_MEM_2_SIZE_HIGH     0x02D0
  72 #define PHB_MEM_2_SIZE_LOW      0x02E0
  73 #define PHB_DOSHOLE_OFFSET      0x08E0
  74
  75 /* PHB_CONFIG_RW */
  76 #define PHB_TCE_ENABLE          0x20000000
  77 #define PHB_SLOT_DISABLE        0x1C000000
  78 #define PHB_DAC_DISABLE         0x01000000
  79 #define PHB_MEM2_ENABLE         0x00400000
  80 #define PHB_MCSR_ENABLE         0x00100000
  81 /* TAR (Table Address Register) */
  82 #define TAR_SW_BITS             0x0000ffffffff800fUL
  83 #define TAR_VALID               0x0000000000000008UL
  84 /* CSR (Channel/DMA Status Register) */
  85 #define CSR_AGENT_MASK          0xffe0ffff
  86
  87 #define MAX_NUM_OF_PHBS         8 /* how many PHBs in total? */
  88 #define MAX_NUM_CHASSIS         8 /* max number of chassis */
  89 /* MAX_PHB_BUS_NUM is the maximal possible dev->bus->number */
  90 #define MAX_PHB_BUS_NUM         (MAX_NUM_OF_PHBS * MAX_NUM_CHASSIS * 2)
  91 #define PHBS_PER_CALGARY        4
  92
  93 /* register offsets in Calgary's internal register space */
  94 static const unsigned long tar_offsets[] = {
  95         0x0580 /* TAR0 */,
  96         0x0588 /* TAR1 */,
  97         0x0590 /* TAR2 */,
  98         0x0598 /* TAR3 */
  99 };
 100
 101 static const unsigned long split_queue_offsets[] = {
 102         0x4870 /* SPLIT QUEUE 0 */,
 103         0x5870 /* SPLIT QUEUE 1 */,
 104         0x6870 /* SPLIT QUEUE 2 */,
 105         0x7870 /* SPLIT QUEUE 3 */
 106 };
 107
 108 static const unsigned long phb_offsets[] = {
 109         0x8000 /* PHB0 */,
 110         0x9000 /* PHB1 */,
 111         0xA000 /* PHB2 */,
 112         0xB000 /* PHB3 */
 113 };
 114
 115 unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
 116 static int translate_empty_slots __read_mostly = 0;
 117 static int calgary_detected __read_mostly = 0;
 118
 119 struct calgary_bus_info {
 120         void *tce_space;
 121         unsigned char translation_disabled;
 122         signed char phbid;
 123 };
 124
 125 static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
 126
 127 static void tce_cache_blast(struct iommu_table *tbl);
 128
 129 /* enable this to stress test the chip's TCE cache */
 130 #ifdef CONFIG_IOMMU_DEBUG
 131 int debugging __read_mostly = 1;
 132
 133 static inline unsigned long verify_bit_range(unsigned long* bitmap,
 134         int expected, unsigned long start, unsigned long end)
 135 {
 136         unsigned long idx = start;
 137
 138         BUG_ON(start >= end);
 139
 140         while (idx < end) {
 141                 if (!!test_bit(idx, bitmap) != expected)
 142                         return idx;
 143                 ++idx;
 144         }
 145
 146         /* all bits have the expected value */
 147         return ~0UL;
 148 }
 149 #else /* debugging is disabled */
 150 int debugging __read_mostly = 0;
 151
 152 static inline unsigned long verify_bit_range(unsigned long* bitmap,
 153         int expected, unsigned long start, unsigned long end)
 154 {
 155         return ~0UL;
 156 }
 157 #endif /* CONFIG_IOMMU_DEBUG */
 158
 159 static inline unsigned int num_dma_pages(unsigned long dma, unsigned int dmalen)
 160 {
 161         unsigned int npages;
 162
 163         npages = PAGE_ALIGN(dma + dmalen) - (dma & PAGE_MASK);
 164         npages >>= PAGE_SHIFT;
 165
 166         return npages;
 167 }
 168
 169 static inline int translate_phb(struct pci_dev* dev)
 170 {
 171         int disabled = bus_info[dev->bus->number].translation_disabled;
 172         return !disabled;
 173 }
 174
 175 static void iommu_range_reserve(struct iommu_table *tbl,
 176         unsigned long start_addr, unsigned int npages)
 177 {
 178         unsigned long index;
 179         unsigned long end;
 180         unsigned long badbit;
 181
 182         index = start_addr >> PAGE_SHIFT;
 183
 184         /* bail out if we're asked to reserve a region we don't cover */
 185         if (index >= tbl->it_size)
 186                 return;
 187
 188         end = index + npages;
 189         if (end > tbl->it_size) /* don't go off the table */
 190                 end = tbl->it_size;
 191
 192         badbit = verify_bit_range(tbl->it_map, 0, index, end);
 193         if (badbit != ~0UL) {
 194                 if (printk_ratelimit())
 195                         printk(KERN_ERR "Calgary: entry already allocated at "
 196                                "0x%lx tbl %p dma 0x%lx npages %u\n",
 197                                badbit, tbl, start_addr, npages);
 198         }
 199
 200         set_bit_string(tbl->it_map, index, npages);
 201 }
 202
 203 static unsigned long iommu_range_alloc(struct iommu_table *tbl,
 204         unsigned int npages)
 205 {
 206         unsigned long offset;
 207
 208         BUG_ON(npages == 0);
 209
 210         offset = find_next_zero_string(tbl->it_map, tbl->it_hint,
 211                                        tbl->it_size, npages);
 212         if (offset == ~0UL) {
 213                 tce_cache_blast(tbl);
 214                 offset = find_next_zero_string(tbl->it_map, 0,
 215                                                tbl->it_size, npages);
 216                 if (offset == ~0UL) {
 217                         printk(KERN_WARNING "Calgary: IOMMU full.\n");
 218                         if (panic_on_overflow)
 219                                 panic("Calgary: fix the allocator.\n");
 220                         else
 221                                 return bad_dma_address;
 222                 }
 223         }
 224
 225         set_bit_string(tbl->it_map, offset, npages);
 226         tbl->it_hint = offset + npages;
 227         BUG_ON(tbl->it_hint > tbl->it_size);
 228
 229         return offset;
 230 }
 231
 232 static dma_addr_t iommu_alloc(struct iommu_table *tbl, void *vaddr,
 233         unsigned int npages, int direction)
 234 {
 235         unsigned long entry, flags;
 236         dma_addr_t ret = bad_dma_address;
 237
 238         spin_lock_irqsave(&tbl->it_lock, flags);
 239
 240         entry = iommu_range_alloc(tbl, npages);
 241
 242         if (unlikely(entry == bad_dma_address))
 243                 goto error;
 244
 245         /* set the return dma address */
 246         ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
 247
 248         /* put the TCEs in the HW table */
 249         tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
 250                   direction);
 251
 252         spin_unlock_irqrestore(&tbl->it_lock, flags);
 253
 254         return ret;
 255
 256 error:
 257         spin_unlock_irqrestore(&tbl->it_lock, flags);
 258         printk(KERN_WARNING "Calgary: failed to allocate %u pages in "
 259                "iommu %p\n", npages, tbl);
 260         return bad_dma_address;
 261 }
 262
 263 static void __iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 264         unsigned int npages)
 265 {
 266         unsigned long entry;
 267         unsigned long badbit;
 268
 269         entry = dma_addr >> PAGE_SHIFT;
 270
 271         BUG_ON(entry + npages > tbl->it_size);
 272
 273         tce_free(tbl, entry, npages);
 274
 275         badbit = verify_bit_range(tbl->it_map, 1, entry, entry + npages);
 276         if (badbit != ~0UL) {
 277                 if (printk_ratelimit())
 278                         printk(KERN_ERR "Calgary: bit is off at 0x%lx "
 279                                "tbl %p dma 0x%Lx entry 0x%lx npages %u\n",
 280                                badbit, tbl, dma_addr, entry, npages);
 281         }
 282
 283         __clear_bit_string(tbl->it_map, entry, npages);
 284 }
 285
 286 static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
 287         unsigned int npages)
 288 {
 289         unsigned long flags;
 290
 291         spin_lock_irqsave(&tbl->it_lock, flags);
 292
 293         __iommu_free(tbl, dma_addr, npages);
 294
 295         spin_unlock_irqrestore(&tbl->it_lock, flags);
 296 }
 297
 298 static void __calgary_unmap_sg(struct iommu_table *tbl,
 299         struct scatterlist *sglist, int nelems, int direction)
 300 {
 301         while (nelems--) {
 302                 unsigned int npages;
 303                 dma_addr_t dma = sglist->dma_address;
 304                 unsigned int dmalen = sglist->dma_length;
 305
 306                 if (dmalen == 0)
 307                         break;
 308
 309                 npages = num_dma_pages(dma, dmalen);
 310                 __iommu_free(tbl, dma, npages);
 311                 sglist++;
 312         }
 313 }
 314
 315 void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
 316                       int nelems, int direction)
 317 {
 318         unsigned long flags;
 319         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 320
 321         if (!translate_phb(to_pci_dev(dev)))
 322                 return;
 323
 324         spin_lock_irqsave(&tbl->it_lock, flags);
 325
 326         __calgary_unmap_sg(tbl, sglist, nelems, direction);
 327
 328         spin_unlock_irqrestore(&tbl->it_lock, flags);
 329 }
 330
 331 static int calgary_nontranslate_map_sg(struct device* dev,
 332         struct scatterlist *sg, int nelems, int direction)
 333 {
 334         int i;
 335
 336         for (i = 0; i < nelems; i++ ) {
 337                 struct scatterlist *s = &sg[i];
 338                 BUG_ON(!s->page);
 339                 s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
 340                 s->dma_length = s->length;
 341         }
 342         return nelems;
 343 }
 344
 345 int calgary_map_sg(struct device *dev, struct scatterlist *sg,
 346         int nelems, int direction)
 347 {
 348         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 349         unsigned long flags;
 350         unsigned long vaddr;
 351         unsigned int npages;
 352         unsigned long entry;
 353         int i;
 354
 355         if (!translate_phb(to_pci_dev(dev)))
 356                 return calgary_nontranslate_map_sg(dev, sg, nelems, direction);
 357
 358         spin_lock_irqsave(&tbl->it_lock, flags);
 359
 360         for (i = 0; i < nelems; i++ ) {
 361                 struct scatterlist *s = &sg[i];
 362                 BUG_ON(!s->page);
 363
 364                 vaddr = (unsigned long)page_address(s->page) + s->offset;
 365                 npages = num_dma_pages(vaddr, s->length);
 366
 367                 entry = iommu_range_alloc(tbl, npages);
 368                 if (entry == bad_dma_address) {
 369                         /* makes sure unmap knows to stop */
 370                         s->dma_length = 0;
 371                         goto error;
 372                 }
 373
 374                 s->dma_address = (entry << PAGE_SHIFT) | s->offset;
 375
 376                 /* insert into HW table */
 377                 tce_build(tbl, entry, npages, vaddr & PAGE_MASK,
 378                           direction);
 379
 380                 s->dma_length = s->length;
 381         }
 382
 383         spin_unlock_irqrestore(&tbl->it_lock, flags);
 384
 385         return nelems;
 386 error:
 387         __calgary_unmap_sg(tbl, sg, nelems, direction);
 388         for (i = 0; i < nelems; i++) {
 389                 sg[i].dma_address = bad_dma_address;
 390                 sg[i].dma_length = 0;
 391         }
 392         spin_unlock_irqrestore(&tbl->it_lock, flags);
 393         return 0;
 394 }
 395
 396 dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
 397         size_t size, int direction)
 398 {
 399         dma_addr_t dma_handle = bad_dma_address;
 400         unsigned long uaddr;
 401         unsigned int npages;
 402         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 403
 404         uaddr = (unsigned long)vaddr;
 405         npages = num_dma_pages(uaddr, size);
 406
 407         if (translate_phb(to_pci_dev(dev)))
 408                 dma_handle = iommu_alloc(tbl, vaddr, npages, direction);
 409         else
 410                 dma_handle = virt_to_bus(vaddr);
 411
 412         return dma_handle;
 413 }
 414
 415 void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
 416         size_t size, int direction)
 417 {
 418         struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
 419         unsigned int npages;
 420
 421         if (!translate_phb(to_pci_dev(dev)))
 422                 return;
 423
 424         npages = num_dma_pages(dma_handle, size);
 425         iommu_free(tbl, dma_handle, npages);
 426 }
 427
 428 void* calgary_alloc_coherent(struct device *dev, size_t size,
 429         dma_addr_t *dma_handle, gfp_t flag)
 430 {
 431         void *ret = NULL;
 432         dma_addr_t mapping;
 433         unsigned int npages, order;
 434         struct iommu_table *tbl;
 435
 436         tbl = to_pci_dev(dev)->bus->self->sysdata;
 437
 438         size = PAGE_ALIGN(size); /* size rounded up to full pages */
 439         npages = size >> PAGE_SHIFT;
 440         order = get_order(size);
 441
 442         /* alloc enough pages (and possibly more) */
 443         ret = (void *)__get_free_pages(flag, order);
 444         if (!ret)
 445                 goto error;
 446         memset(ret, 0, size);
 447
 448         if (translate_phb(to_pci_dev(dev))) {
 449                 /* set up tces to cover the allocated range */
 450                 mapping = iommu_alloc(tbl, ret, npages, DMA_BIDIRECTIONAL);
 451                 if (mapping == bad_dma_address)
 452                         goto free;
 453
 454                 *dma_handle = mapping;
 455         } else /* non translated slot */
 456                 *dma_handle = virt_to_bus(ret);
 457
 458         return ret;
 459
 460 free:
 461         free_pages((unsigned long)ret, get_order(size));
 462         ret = NULL;
 463 error:
 464         return ret;
 465 }
 466
 467 static struct dma_mapping_ops calgary_dma_ops = {
 468         .alloc_coherent = calgary_alloc_coherent,
 469         .map_single = calgary_map_single,
 470         .unmap_single = calgary_unmap_single,
 471         .map_sg = calgary_map_sg,
 472         .unmap_sg = calgary_unmap_sg,
 473 };
 474
 475 static inline int busno_to_phbid(unsigned char num)
 476 {
 477         return bus_info[num].phbid;
 478 }
 479
 480 static inline unsigned long split_queue_offset(unsigned char num)
 481 {
 482         size_t idx = busno_to_phbid(num);
 483
 484         return split_queue_offsets[idx];
 485 }
 486
 487 static inline unsigned long tar_offset(unsigned char num)
 488 {
 489         size_t idx = busno_to_phbid(num);
 490
 491         return tar_offsets[idx];
 492 }
 493
 494 static inline unsigned long phb_offset(unsigned char num)
 495 {
 496         size_t idx = busno_to_phbid(num);
 497
 498         return phb_offsets[idx];
 499 }
 500
 501 static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
 502 {
 503         unsigned long target = ((unsigned long)bar) | offset;
 504         return (void __iomem*)target;
 505 }
 506
 507 static void tce_cache_blast(struct iommu_table *tbl)
 508 {
 509         u64 val;
 510         u32 aer;
 511         int i = 0;
 512         void __iomem *bbar = tbl->bbar;
 513         void __iomem *target;
 514
 515         /* disable arbitration on the bus */
 516         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 517         aer = readl(target);
 518         writel(0, target);
 519
 520         /* read plssr to ensure it got there */
 521         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
 522         val = readl(target);
 523
 524         /* poll split queues until all DMA activity is done */
 525         target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
 526         do {
 527                 val = readq(target);
 528                 i++;
 529         } while ((val & 0xff) != 0xff && i < 100);
 530         if (i == 100)
 531                 printk(KERN_WARNING "Calgary: PCI bus not quiesced, "
 532                        "continuing anyway\n");
 533
 534         /* invalidate TCE cache */
 535         target = calgary_reg(bbar, tar_offset(tbl->it_busno));
 536         writeq(tbl->tar_val, target);
 537
 538         /* enable arbitration */
 539         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
 540         writel(aer, target);
 541         (void)readl(target); /* flush */
 542 }
 543
 544 static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
 545         u64 limit)
 546 {
 547         unsigned int numpages;
 548
 549         limit = limit | 0xfffff;
 550         limit++;
 551
 552         numpages = ((limit - start) >> PAGE_SHIFT);
 553         iommu_range_reserve(dev->sysdata, start, numpages);
 554 }
 555
 556 static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
 557 {
 558         void __iomem *target;
 559         u64 low, high, sizelow;
 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         /* peripheral MEM_1 region */
 566         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
 567         low = be32_to_cpu(readl(target));
 568         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
 569         high = be32_to_cpu(readl(target));
 570         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
 571         sizelow = be32_to_cpu(readl(target));
 572
 573         start = (high << 32) | low;
 574         limit = sizelow;
 575
 576         calgary_reserve_mem_region(dev, start, limit);
 577 }
 578
 579 static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
 580 {
 581         void __iomem *target;
 582         u32 val32;
 583         u64 low, high, sizelow, sizehigh;
 584         u64 start, limit;
 585         struct iommu_table *tbl = dev->sysdata;
 586         unsigned char busnum = dev->bus->number;
 587         void __iomem *bbar = tbl->bbar;
 588
 589         /* is it enabled? */
 590         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 591         val32 = be32_to_cpu(readl(target));
 592         if (!(val32 & PHB_MEM2_ENABLE))
 593                 return;
 594
 595         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
 596         low = be32_to_cpu(readl(target));
 597         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
 598         high = be32_to_cpu(readl(target));
 599         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
 600         sizelow = be32_to_cpu(readl(target));
 601         target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
 602         sizehigh = be32_to_cpu(readl(target));
 603
 604         start = (high << 32) | low;
 605         limit = (sizehigh << 32) | sizelow;
 606
 607         calgary_reserve_mem_region(dev, start, limit);
 608 }
 609
 610 /*
 611  * some regions of the IO address space do not get translated, so we
 612  * must not give devices IO addresses in those regions. The regions
 613  * are the 640KB-1MB region and the two PCI peripheral memory holes.
 614  * Reserve all of them in the IOMMU bitmap to avoid giving them out
 615  * later.
 616  */
 617 static void __init calgary_reserve_regions(struct pci_dev *dev)
 618 {
 619         unsigned int npages;
 620         void __iomem *bbar;
 621         unsigned char busnum;
 622         u64 start;
 623         struct iommu_table *tbl = dev->sysdata;
 624
 625         bbar = tbl->bbar;
 626         busnum = dev->bus->number;
 627
 628         /* reserve bad_dma_address in case it's a legal address */
 629         iommu_range_reserve(tbl, bad_dma_address, 1);
 630
 631         /* avoid the BIOS/VGA first 640KB-1MB region */
 632         start = (640 * 1024);
 633         npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
 634         iommu_range_reserve(tbl, start, npages);
 635
 636         /* reserve the two PCI peripheral memory regions in IO space */
 637         calgary_reserve_peripheral_mem_1(dev);
 638         calgary_reserve_peripheral_mem_2(dev);
 639 }
 640
 641 static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
 642 {
 643         u64 val64;
 644         u64 table_phys;
 645         void __iomem *target;
 646         int ret;
 647         struct iommu_table *tbl;
 648
 649         /* build TCE tables for each PHB */
 650         ret = build_tce_table(dev, bbar);
 651         if (ret)
 652                 return ret;
 653
 654         tbl = dev->sysdata;
 655         tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
 656         tce_free(tbl, 0, tbl->it_size);
 657
 658         calgary_reserve_regions(dev);
 659
 660         /* set TARs for each PHB */
 661         target = calgary_reg(bbar, tar_offset(dev->bus->number));
 662         val64 = be64_to_cpu(readq(target));
 663
 664         /* zero out all TAR bits under sw control */
 665         val64 &= ~TAR_SW_BITS;
 666
 667         tbl = dev->sysdata;
 668         table_phys = (u64)__pa(tbl->it_base);
 669         val64 |= table_phys;
 670
 671         BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
 672         val64 |= (u64) specified_table_size;
 673
 674         tbl->tar_val = cpu_to_be64(val64);
 675         writeq(tbl->tar_val, target);
 676         readq(target); /* flush */
 677
 678         return 0;
 679 }
 680
 681 static void __init calgary_free_bus(struct pci_dev *dev)
 682 {
 683         u64 val64;
 684         struct iommu_table *tbl = dev->sysdata;
 685         void __iomem *target;
 686         unsigned int bitmapsz;
 687
 688         target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
 689         val64 = be64_to_cpu(readq(target));
 690         val64 &= ~TAR_SW_BITS;
 691         writeq(cpu_to_be64(val64), target);
 692         readq(target); /* flush */
 693
 694         bitmapsz = tbl->it_size / BITS_PER_BYTE;
 695         free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
 696         tbl->it_map = NULL;
 697
 698         kfree(tbl);
 699         dev->sysdata = NULL;
 700
 701         /* Can't free bootmem allocated memory after system is up :-( */
 702         bus_info[dev->bus->number].tce_space = NULL;
 703 }
 704
 705 static void calgary_watchdog(unsigned long data)
 706 {
 707         struct pci_dev *dev = (struct pci_dev *)data;
 708         struct iommu_table *tbl = dev->sysdata;
 709         void __iomem *bbar = tbl->bbar;
 710         u32 val32;
 711         void __iomem *target;
 712
 713         target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
 714         val32 = be32_to_cpu(readl(target));
 715
 716         /* If no error, the agent ID in the CSR is not valid */
 717         if (val32 & CSR_AGENT_MASK) {
 718                 printk(KERN_EMERG "calgary_watchdog: DMA error on PHB %#x, "
 719                                   "CSR = %#x\n", dev->bus->number, val32);
 720                 writel(0, target);
 721
 722                 /* Disable bus that caused the error */
 723                 target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
 724                                            PHB_CONFIG_RW_OFFSET);
 725                 val32 = be32_to_cpu(readl(target));
 726                 val32 |= PHB_SLOT_DISABLE;
 727                 writel(cpu_to_be32(val32), target);
 728                 readl(target); /* flush */
 729         } else {
 730                 /* Reset the timer */
 731                 mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
 732         }
 733 }
 734
 735 static void __init calgary_enable_translation(struct pci_dev *dev)
 736 {
 737         u32 val32;
 738         unsigned char busnum;
 739         void __iomem *target;
 740         void __iomem *bbar;
 741         struct iommu_table *tbl;
 742
 743         busnum = dev->bus->number;
 744         tbl = dev->sysdata;
 745         bbar = tbl->bbar;
 746
 747         /* enable TCE in PHB Config Register */
 748         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 749         val32 = be32_to_cpu(readl(target));
 750         val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
 751
 752         printk(KERN_INFO "Calgary: enabling translation on PHB %#x\n", busnum);
 753         printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
 754                "bus.\n");
 755
 756         writel(cpu_to_be32(val32), target);
 757         readl(target); /* flush */
 758
 759         init_timer(&tbl->watchdog_timer);
 760         tbl->watchdog_timer.function = &calgary_watchdog;
 761         tbl->watchdog_timer.data = (unsigned long)dev;
 762         mod_timer(&tbl->watchdog_timer, jiffies);
 763 }
 764
 765 static void __init calgary_disable_translation(struct pci_dev *dev)
 766 {
 767         u32 val32;
 768         unsigned char busnum;
 769         void __iomem *target;
 770         void __iomem *bbar;
 771         struct iommu_table *tbl;
 772
 773         busnum = dev->bus->number;
 774         tbl = dev->sysdata;
 775         bbar = tbl->bbar;
 776
 777         /* disable TCE in PHB Config Register */
 778         target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
 779         val32 = be32_to_cpu(readl(target));
 780         val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
 781
 782         printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
 783         writel(cpu_to_be32(val32), target);
 784         readl(target); /* flush */
 785
 786         del_timer_sync(&tbl->watchdog_timer);
 787 }
 788
 789 static inline unsigned int __init locate_register_space(struct pci_dev *dev)
 790 {
 791         int rionodeid;
 792         u32 address;
 793
 794         /*
 795          * Each Calgary has four busses. The first four busses (first Calgary)
 796          * have RIO node ID 2, then the next four (second Calgary) have RIO
 797          * node ID 3, the next four (third Calgary) have node ID 2 again, etc.
 798          * We use a gross hack - relying on the dev->bus->number ordering,
 799          * modulo 14 - to decide which Calgary a given bus is on. Busses 0, 1,
 800          * 2 and 4 are on the first Calgary (id 2), 6, 8, a and c are on the
 801          * second (id 3), and then it repeats modulo 14.
 802          */
 803         rionodeid = (dev->bus->number % 14 > 4) ? 3 : 2;
 804         /*
 805          * register space address calculation as follows:
 806          * FE0MB-8MB*OneBasedChassisNumber+1MB*(RioNodeId-ChassisBase)
 807          * ChassisBase is always zero for x366/x260/x460
 808          * RioNodeId is 2 for first Calgary, 3 for second Calgary
 809          */
 810         address = START_ADDRESS -
 811                 (0x800000 * (ONE_BASED_CHASSIS_NUM + dev->bus->number / 14)) +
 812                 (0x100000) * (rionodeid - CHASSIS_BASE);
 813         return address;
 814 }
 815
 816 static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
 817 {
 818         pci_dev_get(dev);
 819         dev->sysdata = NULL;
 820         dev->bus->self = dev;
 821 }
 822
 823 static int __init calgary_init_one(struct pci_dev *dev)
 824 {
 825         u32 address;
 826         void __iomem *bbar;
 827         int ret;
 828
 829         BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
 830
 831         address = locate_register_space(dev);
 832         /* map entire 1MB of Calgary config space */
 833         bbar = ioremap_nocache(address, 1024 * 1024);
 834         if (!bbar) {
 835                 ret = -ENODATA;
 836                 goto done;
 837         }
 838
 839         ret = calgary_setup_tar(dev, bbar);
 840         if (ret)
 841                 goto iounmap;
 842
 843         pci_dev_get(dev);
 844         dev->bus->self = dev;
 845         calgary_enable_translation(dev);
 846
 847         return 0;
 848
 849 iounmap:
 850         iounmap(bbar);
 851 done:
 852         return ret;
 853 }
 854
 855 static int __init calgary_init(void)
 856 {
 857         int ret = -ENODEV;
 858         struct pci_dev *dev = NULL;
 859
 860         do {
 861                 dev = pci_get_device(PCI_VENDOR_ID_IBM,
 862                                      PCI_DEVICE_ID_IBM_CALGARY,
 863                                      dev);
 864                 if (!dev)
 865                         break;
 866                 if (!translate_phb(dev)) {
 867                         calgary_init_one_nontraslated(dev);
 868                         continue;
 869                 }
 870                 if (!bus_info[dev->bus->number].tce_space && !translate_empty_slots)
 871                         continue;
 872
 873                 ret = calgary_init_one(dev);
 874                 if (ret)
 875                         goto error;
 876         } while (1);
 877
 878         return ret;
 879
 880 error:
 881         do {
 882                 dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM,
 883                                               PCI_DEVICE_ID_IBM_CALGARY,
 884                                               dev);
 885                 if (!dev)
 886                         break;
 887                 if (!translate_phb(dev)) {
 888                         pci_dev_put(dev);
 889                         continue;
 890                 }
 891                 if (!bus_info[dev->bus->number].tce_space && !translate_empty_slots)
 892                         continue;
 893
 894                 calgary_disable_translation(dev);
 895                 calgary_free_bus(dev);
 896                 pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
 897         } while (1);
 898
 899         return ret;
 900 }
 901
 902 static inline int __init determine_tce_table_size(u64 ram)
 903 {
 904         int ret;
 905
 906         if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
 907                 return specified_table_size;
 908
 909         /*
 910          * Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
 911          * TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
 912          * larger table size has twice as many entries, so shift the
 913          * max ram address by 13 to divide by 8K and then look at the
 914          * order of the result to choose between 0-7.
 915          */
 916         ret = get_order(ram >> 13);
 917         if (ret > TCE_TABLE_SIZE_8M)
 918                 ret = TCE_TABLE_SIZE_8M;
 919
 920         return ret;
 921 }
 922
 923 void __init detect_calgary(void)
 924 {
 925         u32 val;
 926         int bus;
 927         void *tbl;
 928         int calgary_found = 0;
 929         int phb = -1;
 930
 931         /*
 932          * if the user specified iommu=off or iommu=soft or we found
 933          * another HW IOMMU already, bail out.
 934          */
 935         if (swiotlb || no_iommu || iommu_detected)
 936                 return;
 937
 938         if (!early_pci_allowed())
 939                 return;
 940
 941         specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
 942
 943         for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
 944                 int dev;
 945                 struct calgary_bus_info *info = &bus_info[bus];
 946                 info->phbid = -1;
 947
 948                 if (read_pci_config(bus, 0, 0, 0) != PCI_VENDOR_DEVICE_ID_CALGARY)
 949                         continue;
 950
 951                 /*
 952                  * There are 4 PHBs per Calgary chip.  Set phb to which phb (0-3)
 953                  * it is connected to releative to the clagary chip.
 954                  */
 955                 phb = (phb + 1) % PHBS_PER_CALGARY;
 956
 957                 if (info->translation_disabled)
 958                         continue;
 959
 960                 /*
 961                  * Scan the slots of the PCI bus to see if there is a device present.
 962                  * The parent bus will be the zero-ith device, so start at 1.
 963                  */
 964                 for (dev = 1; dev < 8; dev++) {
 965                         val = read_pci_config(bus, dev, 0, 0);
 966                         if (val != 0xffffffff || translate_empty_slots) {
 967                                 tbl = alloc_tce_table();
 968                                 if (!tbl)
 969                                         goto cleanup;
 970                                 info->tce_space = tbl;
 971                                 info->phbid = phb;
 972                                 calgary_found = 1;
 973                                 break;
 974                         }
 975                 }
 976         }
 977
 978         if (calgary_found) {
 979                 iommu_detected = 1;
 980                 calgary_detected = 1;
 981                 printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
 982                 printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d, "
 983                        "CONFIG_IOMMU_DEBUG is %s.\n", specified_table_size,
 984                        debugging ? "enabled" : "disabled");
 985         }
 986         return;
 987
 988 cleanup:
 989         for (--bus; bus >= 0; --bus) {
 990                 struct calgary_bus_info *info = &bus_info[bus];
 991
 992                 if (info->tce_space)
 993                         free_tce_table(info->tce_space);
 994         }
 995 }
 996
 997 int __init calgary_iommu_init(void)
 998 {
 999         int ret;
1000
1001         if (no_iommu || swiotlb)
1002                 return -ENODEV;
1003
1004         if (!calgary_detected)
1005                 return -ENODEV;
1006
1007         /* ok, we're trying to use Calgary - let's roll */
1008         printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
1009
1010         ret = calgary_init();
1011         if (ret) {
1012                 printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
1013                        "falling back to no_iommu\n", ret);
1014                 if (end_pfn > MAX_DMA32_PFN)
1015                         printk(KERN_ERR "WARNING more than 4GB of memory, "
1016                                         "32bit PCI may malfunction.\n");
1017                 return ret;
1018         }
1019
1020         force_iommu = 1;
1021         dma_ops = &calgary_dma_ops;
1022
1023         return 0;
1024 }
1025
1026 static int __init calgary_parse_options(char *p)
1027 {
1028         unsigned int bridge;
1029         size_t len;
1030         char* endp;
1031
1032         while (*p) {
1033                 if (!strncmp(p, "64k", 3))
1034                         specified_table_size = TCE_TABLE_SIZE_64K;
1035                 else if (!strncmp(p, "128k", 4))
1036                         specified_table_size = TCE_TABLE_SIZE_128K;
1037                 else if (!strncmp(p, "256k", 4))
1038                         specified_table_size = TCE_TABLE_SIZE_256K;
1039                 else if (!strncmp(p, "512k", 4))
1040                         specified_table_size = TCE_TABLE_SIZE_512K;
1041                 else if (!strncmp(p, "1M", 2))
1042                         specified_table_size = TCE_TABLE_SIZE_1M;
1043                 else if (!strncmp(p, "2M", 2))
1044                         specified_table_size = TCE_TABLE_SIZE_2M;
1045                 else if (!strncmp(p, "4M", 2))
1046                         specified_table_size = TCE_TABLE_SIZE_4M;
1047                 else if (!strncmp(p, "8M", 2))
1048                         specified_table_size = TCE_TABLE_SIZE_8M;
1049
1050                 len = strlen("translate_empty_slots");
1051                 if (!strncmp(p, "translate_empty_slots", len))
1052                         translate_empty_slots = 1;
1053
1054                 len = strlen("disable");
1055                 if (!strncmp(p, "disable", len)) {
1056                         p += len;
1057                         if (*p == '=')
1058                                 ++p;
1059                         if (*p == '\0')
1060                                 break;
1061                         bridge = simple_strtol(p, &endp, 0);
1062                         if (p == endp)
1063                                 break;
1064
1065                         if (bridge < MAX_PHB_BUS_NUM) {
1066                                 printk(KERN_INFO "Calgary: disabling "
1067                                        "translation for PHB %#x\n", bridge);
1068                                 bus_info[bridge].translation_disabled = 1;
1069                         }
1070                 }
1071
1072                 p = strpbrk(p, ",");
1073                 if (!p)
1074                         break;
1075
1076                 p++; /* skip ',' */
1077         }
1078         return 1;
1079 }
1080 __setup("calgary=", calgary_parse_options);