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