arch/powerpc/platforms/powernv/pci.c

   1 /*
   2  * Support PCI/PCIe on PowerNV platforms
   3  *
   4  * Currently supports only P5IOC2
   5  *
   6  * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version
  11  * 2 of the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/delay.h>
  17 #include <linux/string.h>
  18 #include <linux/init.h>
  19 #include <linux/bootmem.h>
  20 #include <linux/irq.h>
  21 #include <linux/io.h>
  22 #include <linux/msi.h>
  23 #include <linux/iommu.h>
  24
  25 #include <asm/sections.h>
  26 #include <asm/io.h>
  27 #include <asm/prom.h>
  28 #include <asm/pci-bridge.h>
  29 #include <asm/machdep.h>
  30 #include <asm/msi_bitmap.h>
  31 #include <asm/ppc-pci.h>
  32 #include <asm/opal.h>
  33 #include <asm/iommu.h>
  34 #include <asm/tce.h>
  35 #include <asm/firmware.h>
  36 #include <asm/eeh_event.h>
  37 #include <asm/eeh.h>
  38
  39 #include "powernv.h"
  40 #include "pci.h"
  41
  42 /* Delay in usec */
  43 #define PCI_RESET_DELAY_US      3000000
  44
  45 #define cfg_dbg(fmt...) do { } while(0)
  46 //#define cfg_dbg(fmt...)       printk(fmt)
  47
  48 #ifdef CONFIG_PCI_MSI
  49 static int pnv_msi_check_device(struct pci_dev* pdev, int nvec, int type)
  50 {
  51         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
  52         struct pnv_phb *phb = hose->private_data;
  53         struct pci_dn *pdn = pci_get_pdn(pdev);
  54
  55         if (pdn && pdn->force_32bit_msi && !phb->msi32_support)
  56                 return -ENODEV;
  57
  58         return (phb && phb->msi_bmp.bitmap) ? 0 : -ENODEV;
  59 }
  60
  61 static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
  62 {
  63         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
  64         struct pnv_phb *phb = hose->private_data;
  65         struct msi_desc *entry;
  66         struct msi_msg msg;
  67         int hwirq;
  68         unsigned int virq;
  69         int rc;
  70
  71         if (WARN_ON(!phb))
  72                 return -ENODEV;
  73
  74         list_for_each_entry(entry, &pdev->msi_list, list) {
  75                 if (!entry->msi_attrib.is_64 && !phb->msi32_support) {
  76                         pr_warn("%s: Supports only 64-bit MSIs\n",
  77                                 pci_name(pdev));
  78                         return -ENXIO;
  79                 }
  80                 hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, 1);
  81                 if (hwirq < 0) {
  82                         pr_warn("%s: Failed to find a free MSI\n",
  83                                 pci_name(pdev));
  84                         return -ENOSPC;
  85                 }
  86                 virq = irq_create_mapping(NULL, phb->msi_base + hwirq);
  87                 if (virq == NO_IRQ) {
  88                         pr_warn("%s: Failed to map MSI to linux irq\n",
  89                                 pci_name(pdev));
  90                         msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
  91                         return -ENOMEM;
  92                 }
  93                 rc = phb->msi_setup(phb, pdev, phb->msi_base + hwirq,
  94                                     virq, entry->msi_attrib.is_64, &msg);
  95                 if (rc) {
  96                         pr_warn("%s: Failed to setup MSI\n", pci_name(pdev));
  97                         irq_dispose_mapping(virq);
  98                         msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
  99                         return rc;
 100                 }
 101                 irq_set_msi_desc(virq, entry);
 102                 write_msi_msg(virq, &msg);
 103         }
 104         return 0;
 105 }
 106
 107 static void pnv_teardown_msi_irqs(struct pci_dev *pdev)
 108 {
 109         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 110         struct pnv_phb *phb = hose->private_data;
 111         struct msi_desc *entry;
 112
 113         if (WARN_ON(!phb))
 114                 return;
 115
 116         list_for_each_entry(entry, &pdev->msi_list, list) {
 117                 if (entry->irq == NO_IRQ)
 118                         continue;
 119                 irq_set_msi_desc(entry->irq, NULL);
 120                 msi_bitmap_free_hwirqs(&phb->msi_bmp,
 121                         virq_to_hw(entry->irq) - phb->msi_base, 1);
 122                 irq_dispose_mapping(entry->irq);
 123         }
 124 }
 125 #endif /* CONFIG_PCI_MSI */
 126
 127 static void pnv_pci_dump_p7ioc_diag_data(struct pnv_phb *phb)
 128 {
 129         struct OpalIoP7IOCPhbErrorData *data = &phb->diag.p7ioc;
 130         int i;
 131
 132         pr_info("PHB %d diagnostic data:\n", phb->hose->global_number);
 133
 134         pr_info("  brdgCtl              = 0x%08x\n", data->brdgCtl);
 135
 136         pr_info("  portStatusReg        = 0x%08x\n", data->portStatusReg);
 137         pr_info("  rootCmplxStatus      = 0x%08x\n", data->rootCmplxStatus);
 138         pr_info("  busAgentStatus       = 0x%08x\n", data->busAgentStatus);
 139
 140         pr_info("  deviceStatus         = 0x%08x\n", data->deviceStatus);
 141         pr_info("  slotStatus           = 0x%08x\n", data->slotStatus);
 142         pr_info("  linkStatus           = 0x%08x\n", data->linkStatus);
 143         pr_info("  devCmdStatus         = 0x%08x\n", data->devCmdStatus);
 144         pr_info("  devSecStatus         = 0x%08x\n", data->devSecStatus);
 145
 146         pr_info("  rootErrorStatus      = 0x%08x\n", data->rootErrorStatus);
 147         pr_info("  uncorrErrorStatus    = 0x%08x\n", data->uncorrErrorStatus);
 148         pr_info("  corrErrorStatus      = 0x%08x\n", data->corrErrorStatus);
 149         pr_info("  tlpHdr1              = 0x%08x\n", data->tlpHdr1);
 150         pr_info("  tlpHdr2              = 0x%08x\n", data->tlpHdr2);
 151         pr_info("  tlpHdr3              = 0x%08x\n", data->tlpHdr3);
 152         pr_info("  tlpHdr4              = 0x%08x\n", data->tlpHdr4);
 153         pr_info("  sourceId             = 0x%08x\n", data->sourceId);
 154
 155         pr_info("  errorClass           = 0x%016llx\n", data->errorClass);
 156         pr_info("  correlator           = 0x%016llx\n", data->correlator);
 157
 158         pr_info("  p7iocPlssr           = 0x%016llx\n", data->p7iocPlssr);
 159         pr_info("  p7iocCsr             = 0x%016llx\n", data->p7iocCsr);
 160         pr_info("  lemFir               = 0x%016llx\n", data->lemFir);
 161         pr_info("  lemErrorMask         = 0x%016llx\n", data->lemErrorMask);
 162         pr_info("  lemWOF               = 0x%016llx\n", data->lemWOF);
 163         pr_info("  phbErrorStatus       = 0x%016llx\n", data->phbErrorStatus);
 164         pr_info("  phbFirstErrorStatus  = 0x%016llx\n", data->phbFirstErrorStatus);
 165         pr_info("  phbErrorLog0         = 0x%016llx\n", data->phbErrorLog0);
 166         pr_info("  phbErrorLog1         = 0x%016llx\n", data->phbErrorLog1);
 167         pr_info("  mmioErrorStatus      = 0x%016llx\n", data->mmioErrorStatus);
 168         pr_info("  mmioFirstErrorStatus = 0x%016llx\n", data->mmioFirstErrorStatus);
 169         pr_info("  mmioErrorLog0        = 0x%016llx\n", data->mmioErrorLog0);
 170         pr_info("  mmioErrorLog1        = 0x%016llx\n", data->mmioErrorLog1);
 171         pr_info("  dma0ErrorStatus      = 0x%016llx\n", data->dma0ErrorStatus);
 172         pr_info("  dma0FirstErrorStatus = 0x%016llx\n", data->dma0FirstErrorStatus);
 173         pr_info("  dma0ErrorLog0        = 0x%016llx\n", data->dma0ErrorLog0);
 174         pr_info("  dma0ErrorLog1        = 0x%016llx\n", data->dma0ErrorLog1);
 175         pr_info("  dma1ErrorStatus      = 0x%016llx\n", data->dma1ErrorStatus);
 176         pr_info("  dma1FirstErrorStatus = 0x%016llx\n", data->dma1FirstErrorStatus);
 177         pr_info("  dma1ErrorLog0        = 0x%016llx\n", data->dma1ErrorLog0);
 178         pr_info("  dma1ErrorLog1        = 0x%016llx\n", data->dma1ErrorLog1);
 179
 180         for (i = 0; i < OPAL_P7IOC_NUM_PEST_REGS; i++) {
 181                 if ((data->pestA[i] >> 63) == 0 &&
 182                     (data->pestB[i] >> 63) == 0)
 183                         continue;
 184                 pr_info("  PE[%3d] PESTA        = 0x%016llx\n", i, data->pestA[i]);
 185                 pr_info("          PESTB        = 0x%016llx\n", data->pestB[i]);
 186         }
 187 }
 188
 189 static void pnv_pci_dump_phb_diag_data(struct pnv_phb *phb)
 190 {
 191         switch(phb->model) {
 192         case PNV_PHB_MODEL_P7IOC:
 193                 pnv_pci_dump_p7ioc_diag_data(phb);
 194                 break;
 195         default:
 196                 pr_warning("PCI %d: Can't decode this PHB diag data\n",
 197                            phb->hose->global_number);
 198         }
 199 }
 200
 201 static void pnv_pci_handle_eeh_config(struct pnv_phb *phb, u32 pe_no)
 202 {
 203         unsigned long flags, rc;
 204         int has_diag;
 205
 206         spin_lock_irqsave(&phb->lock, flags);
 207
 208         rc = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag.blob,
 209                                          PNV_PCI_DIAG_BUF_SIZE);
 210         has_diag = (rc == OPAL_SUCCESS);
 211
 212         rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
 213                                        OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
 214         if (rc) {
 215                 pr_warning("PCI %d: Failed to clear EEH freeze state"
 216                            " for PE#%d, err %ld\n",
 217                            phb->hose->global_number, pe_no, rc);
 218
 219                 /* For now, let's only display the diag buffer when we fail to clear
 220                  * the EEH status. We'll do more sensible things later when we have
 221                  * proper EEH support. We need to make sure we don't pollute ourselves
 222                  * with the normal errors generated when probing empty slots
 223                  */
 224                 if (has_diag)
 225                         pnv_pci_dump_phb_diag_data(phb);
 226                 else
 227                         pr_warning("PCI %d: No diag data available\n",
 228                                    phb->hose->global_number);
 229         }
 230
 231         spin_unlock_irqrestore(&phb->lock, flags);
 232 }
 233
 234 static void pnv_pci_config_check_eeh(struct pnv_phb *phb,
 235                                      struct device_node *dn)
 236 {
 237         s64     rc;
 238         u8      fstate;
 239         u16     pcierr;
 240         u32     pe_no;
 241
 242         /*
 243          * Get the PE#. During the PCI probe stage, we might not
 244          * setup that yet. So all ER errors should be mapped to
 245          * PE#0
 246          */
 247         pe_no = PCI_DN(dn)->pe_number;
 248         if (pe_no == IODA_INVALID_PE)
 249                 pe_no = 0;
 250
 251         /* Read freeze status */
 252         rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no, &fstate, &pcierr,
 253                                         NULL);
 254         if (rc) {
 255                 pr_warning("%s: Can't read EEH status (PE#%d) for "
 256                            "%s, err %lld\n",
 257                            __func__, pe_no, dn->full_name, rc);
 258                 return;
 259         }
 260         cfg_dbg(" -> EEH check, bdfn=%04x PE#%d fstate=%x\n",
 261                 (PCI_DN(dn)->busno << 8) | (PCI_DN(dn)->devfn),
 262                 pe_no, fstate);
 263         if (fstate != 0)
 264                 pnv_pci_handle_eeh_config(phb, pe_no);
 265 }
 266
 267 int pnv_pci_cfg_read(struct device_node *dn,
 268                      int where, int size, u32 *val)
 269 {
 270         struct pci_dn *pdn = PCI_DN(dn);
 271         struct pnv_phb *phb = pdn->phb->private_data;
 272         u32 bdfn = (pdn->busno << 8) | pdn->devfn;
 273 #ifdef CONFIG_EEH
 274         struct eeh_pe *phb_pe = NULL;
 275 #endif
 276         s64 rc;
 277
 278         switch (size) {
 279         case 1: {
 280                 u8 v8;
 281                 rc = opal_pci_config_read_byte(phb->opal_id, bdfn, where, &v8);
 282                 *val = (rc == OPAL_SUCCESS) ? v8 : 0xff;
 283                 break;
 284         }
 285         case 2: {
 286                 u16 v16;
 287                 rc = opal_pci_config_read_half_word(phb->opal_id, bdfn, where,
 288                                                    &v16);
 289                 *val = (rc == OPAL_SUCCESS) ? v16 : 0xffff;
 290                 break;
 291         }
 292         case 4: {
 293                 u32 v32;
 294                 rc = opal_pci_config_read_word(phb->opal_id, bdfn, where, &v32);
 295                 *val = (rc == OPAL_SUCCESS) ? v32 : 0xffffffff;
 296                 break;
 297         }
 298         default:
 299                 return PCIBIOS_FUNC_NOT_SUPPORTED;
 300         }
 301         cfg_dbg("%s: bus: %x devfn: %x +%x/%x -> %08x\n",
 302                 __func__, pdn->busno, pdn->devfn, where, size, *val);
 303
 304         /*
 305          * Check if the specified PE has been put into frozen
 306          * state. On the other hand, we needn't do that while
 307          * the PHB has been put into frozen state because of
 308          * PHB-fatal errors.
 309          */
 310 #ifdef CONFIG_EEH
 311         phb_pe = eeh_phb_pe_get(pdn->phb);
 312         if (phb_pe && (phb_pe->state & EEH_PE_ISOLATED))
 313                 return PCIBIOS_SUCCESSFUL;
 314
 315         if (phb->eeh_state & PNV_EEH_STATE_ENABLED) {
 316                 if (*val == EEH_IO_ERROR_VALUE(size) &&
 317                     eeh_dev_check_failure(of_node_to_eeh_dev(dn)))
 318                         return PCIBIOS_DEVICE_NOT_FOUND;
 319         } else {
 320                 pnv_pci_config_check_eeh(phb, dn);
 321         }
 322 #else
 323         pnv_pci_config_check_eeh(phb, dn);
 324 #endif
 325
 326         return PCIBIOS_SUCCESSFUL;
 327 }
 328
 329 int pnv_pci_cfg_write(struct device_node *dn,
 330                       int where, int size, u32 val)
 331 {
 332         struct pci_dn *pdn = PCI_DN(dn);
 333         struct pnv_phb *phb = pdn->phb->private_data;
 334         u32 bdfn = (pdn->busno << 8) | pdn->devfn;
 335
 336         cfg_dbg("%s: bus: %x devfn: %x +%x/%x -> %08x\n",
 337                 pdn->busno, pdn->devfn, where, size, val);
 338         switch (size) {
 339         case 1:
 340                 opal_pci_config_write_byte(phb->opal_id, bdfn, where, val);
 341                 break;
 342         case 2:
 343                 opal_pci_config_write_half_word(phb->opal_id, bdfn, where, val);
 344                 break;
 345         case 4:
 346                 opal_pci_config_write_word(phb->opal_id, bdfn, where, val);
 347                 break;
 348         default:
 349                 return PCIBIOS_FUNC_NOT_SUPPORTED;
 350         }
 351
 352         /* Check if the PHB got frozen due to an error (no response) */
 353 #ifdef CONFIG_EEH
 354         if (!(phb->eeh_state & PNV_EEH_STATE_ENABLED))
 355                 pnv_pci_config_check_eeh(phb, dn);
 356 #else
 357         pnv_pci_config_check_eeh(phb, dn);
 358 #endif
 359
 360         return PCIBIOS_SUCCESSFUL;
 361 }
 362
 363 static int pnv_pci_read_config(struct pci_bus *bus,
 364                                unsigned int devfn,
 365                                int where, int size, u32 *val)
 366 {
 367         struct device_node *dn, *busdn = pci_bus_to_OF_node(bus);
 368         struct pci_dn *pdn;
 369
 370         for (dn = busdn->child; dn; dn = dn->sibling) {
 371                 pdn = PCI_DN(dn);
 372                 if (pdn && pdn->devfn == devfn)
 373                         return pnv_pci_cfg_read(dn, where, size, val);
 374         }
 375
 376         *val = 0xFFFFFFFF;
 377         return PCIBIOS_DEVICE_NOT_FOUND;
 378
 379 }
 380
 381 static int pnv_pci_write_config(struct pci_bus *bus,
 382                                 unsigned int devfn,
 383                                 int where, int size, u32 val)
 384 {
 385         struct device_node *dn, *busdn = pci_bus_to_OF_node(bus);
 386         struct pci_dn *pdn;
 387
 388         for (dn = busdn->child; dn; dn = dn->sibling) {
 389                 pdn = PCI_DN(dn);
 390                 if (pdn && pdn->devfn == devfn)
 391                         return pnv_pci_cfg_write(dn, where, size, val);
 392         }
 393
 394         return PCIBIOS_DEVICE_NOT_FOUND;
 395 }
 396
 397 struct pci_ops pnv_pci_ops = {
 398         .read  = pnv_pci_read_config,
 399         .write = pnv_pci_write_config,
 400 };
 401
 402 static int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
 403                          unsigned long uaddr, enum dma_data_direction direction,
 404                          struct dma_attrs *attrs)
 405 {
 406         u64 proto_tce;
 407         u64 *tcep, *tces;
 408         u64 rpn;
 409
 410         proto_tce = TCE_PCI_READ; // Read allowed
 411
 412         if (direction != DMA_TO_DEVICE)
 413                 proto_tce |= TCE_PCI_WRITE;
 414
 415         tces = tcep = ((u64 *)tbl->it_base) + index - tbl->it_offset;
 416         rpn = __pa(uaddr) >> TCE_SHIFT;
 417
 418         while (npages--)
 419                 *(tcep++) = proto_tce | (rpn++ << TCE_RPN_SHIFT);
 420
 421         /* Some implementations won't cache invalid TCEs and thus may not
 422          * need that flush. We'll probably turn it_type into a bit mask
 423          * of flags if that becomes the case
 424          */
 425         if (tbl->it_type & TCE_PCI_SWINV_CREATE)
 426                 pnv_pci_ioda_tce_invalidate(tbl, tces, tcep - 1);
 427
 428         return 0;
 429 }
 430
 431 static void pnv_tce_free(struct iommu_table *tbl, long index, long npages)
 432 {
 433         u64 *tcep, *tces;
 434
 435         tces = tcep = ((u64 *)tbl->it_base) + index - tbl->it_offset;
 436
 437         while (npages--)
 438                 *(tcep++) = 0;
 439
 440         if (tbl->it_type & TCE_PCI_SWINV_FREE)
 441                 pnv_pci_ioda_tce_invalidate(tbl, tces, tcep - 1);
 442 }
 443
 444 static unsigned long pnv_tce_get(struct iommu_table *tbl, long index)
 445 {
 446         return ((u64 *)tbl->it_base)[index - tbl->it_offset];
 447 }
 448
 449 void pnv_pci_setup_iommu_table(struct iommu_table *tbl,
 450                                void *tce_mem, u64 tce_size,
 451                                u64 dma_offset)
 452 {
 453         tbl->it_blocksize = 16;
 454         tbl->it_base = (unsigned long)tce_mem;
 455         tbl->it_offset = dma_offset >> IOMMU_PAGE_SHIFT;
 456         tbl->it_index = 0;
 457         tbl->it_size = tce_size >> 3;
 458         tbl->it_busno = 0;
 459         tbl->it_type = TCE_PCI;
 460 }
 461
 462 static struct iommu_table *pnv_pci_setup_bml_iommu(struct pci_controller *hose)
 463 {
 464         struct iommu_table *tbl;
 465         const __be64 *basep, *swinvp;
 466         const __be32 *sizep;
 467
 468         basep = of_get_property(hose->dn, "linux,tce-base", NULL);
 469         sizep = of_get_property(hose->dn, "linux,tce-size", NULL);
 470         if (basep == NULL || sizep == NULL) {
 471                 pr_err("PCI: %s has missing tce entries !\n",
 472                        hose->dn->full_name);
 473                 return NULL;
 474         }
 475         tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, hose->node);
 476         if (WARN_ON(!tbl))
 477                 return NULL;
 478         pnv_pci_setup_iommu_table(tbl, __va(be64_to_cpup(basep)),
 479                                   be32_to_cpup(sizep), 0);
 480         iommu_init_table(tbl, hose->node);
 481         iommu_register_group(tbl, pci_domain_nr(hose->bus), 0);
 482
 483         /* Deal with SW invalidated TCEs when needed (BML way) */
 484         swinvp = of_get_property(hose->dn, "linux,tce-sw-invalidate-info",
 485                                  NULL);
 486         if (swinvp) {
 487                 tbl->it_busno = swinvp[1];
 488                 tbl->it_index = (unsigned long)ioremap(swinvp[0], 8);
 489                 tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
 490         }
 491         return tbl;
 492 }
 493
 494 static void pnv_pci_dma_fallback_setup(struct pci_controller *hose,
 495                                        struct pci_dev *pdev)
 496 {
 497         struct device_node *np = pci_bus_to_OF_node(hose->bus);
 498         struct pci_dn *pdn;
 499
 500         if (np == NULL)
 501                 return;
 502         pdn = PCI_DN(np);
 503         if (!pdn->iommu_table)
 504                 pdn->iommu_table = pnv_pci_setup_bml_iommu(hose);
 505         if (!pdn->iommu_table)
 506                 return;
 507         set_iommu_table_base(&pdev->dev, pdn->iommu_table);
 508 }
 509
 510 static void pnv_pci_dma_dev_setup(struct pci_dev *pdev)
 511 {
 512         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
 513         struct pnv_phb *phb = hose->private_data;
 514
 515         /* If we have no phb structure, try to setup a fallback based on
 516          * the device-tree (RTAS PCI for example)
 517          */
 518         if (phb && phb->dma_dev_setup)
 519                 phb->dma_dev_setup(phb, pdev);
 520         else
 521                 pnv_pci_dma_fallback_setup(hose, pdev);
 522 }
 523
 524 void pnv_pci_shutdown(void)
 525 {
 526         struct pci_controller *hose;
 527
 528         list_for_each_entry(hose, &hose_list, list_node) {
 529                 struct pnv_phb *phb = hose->private_data;
 530
 531                 if (phb && phb->shutdown)
 532                         phb->shutdown(phb);
 533         }
 534 }
 535
 536 /* Fixup wrong class code in p7ioc and p8 root complex */
 537 static void pnv_p7ioc_rc_quirk(struct pci_dev *dev)
 538 {
 539         dev->class = PCI_CLASS_BRIDGE_PCI << 8;
 540 }
 541 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM, 0x3b9, pnv_p7ioc_rc_quirk);
 542
 543 static int pnv_pci_probe_mode(struct pci_bus *bus)
 544 {
 545         struct pci_controller *hose = pci_bus_to_host(bus);
 546         const __be64 *tstamp;
 547         u64 now, target;
 548
 549
 550         /* We hijack this as a way to ensure we have waited long
 551          * enough since the reset was lifted on the PCI bus
 552          */
 553         if (bus != hose->bus)
 554                 return PCI_PROBE_NORMAL;
 555         tstamp = of_get_property(hose->dn, "reset-clear-timestamp", NULL);
 556         if (!tstamp || !*tstamp)
 557                 return PCI_PROBE_NORMAL;
 558
 559         now = mftb() / tb_ticks_per_usec;
 560         target = (be64_to_cpup(tstamp) / tb_ticks_per_usec)
 561                 + PCI_RESET_DELAY_US;
 562
 563         pr_devel("pci %04d: Reset target: 0x%llx now: 0x%llx\n",
 564                  hose->global_number, target, now);
 565
 566         if (now < target)
 567                 msleep((target - now + 999) / 1000);
 568
 569         return PCI_PROBE_NORMAL;
 570 }
 571
 572 void __init pnv_pci_init(void)
 573 {
 574         struct device_node *np;
 575
 576         pci_add_flags(PCI_CAN_SKIP_ISA_ALIGN);
 577
 578         /* OPAL absent, try POPAL first then RTAS detection of PHBs */
 579         if (!firmware_has_feature(FW_FEATURE_OPAL)) {
 580 #ifdef CONFIG_PPC_POWERNV_RTAS
 581                 init_pci_config_tokens();
 582                 find_and_init_phbs();
 583 #endif /* CONFIG_PPC_POWERNV_RTAS */
 584         }
 585         /* OPAL is here, do our normal stuff */
 586         else {
 587                 int found_ioda = 0;
 588
 589                 /* Look for IODA IO-Hubs. We don't support mixing IODA
 590                  * and p5ioc2 due to the need to change some global
 591                  * probing flags
 592                  */
 593                 for_each_compatible_node(np, NULL, "ibm,ioda-hub") {
 594                         pnv_pci_init_ioda_hub(np);
 595                         found_ioda = 1;
 596                 }
 597
 598                 /* Look for p5ioc2 IO-Hubs */
 599                 if (!found_ioda)
 600                         for_each_compatible_node(np, NULL, "ibm,p5ioc2")
 601                                 pnv_pci_init_p5ioc2_hub(np);
 602
 603                 /* Look for ioda2 built-in PHB3's */
 604                 for_each_compatible_node(np, NULL, "ibm,ioda2-phb")
 605                         pnv_pci_init_ioda2_phb(np);
 606         }
 607
 608         /* Setup the linkage between OF nodes and PHBs */
 609         pci_devs_phb_init();
 610
 611         /* Configure IOMMU DMA hooks */
 612         ppc_md.pci_dma_dev_setup = pnv_pci_dma_dev_setup;
 613         ppc_md.tce_build = pnv_tce_build;
 614         ppc_md.tce_free = pnv_tce_free;
 615         ppc_md.tce_get = pnv_tce_get;
 616         ppc_md.pci_probe_mode = pnv_pci_probe_mode;
 617         set_pci_dma_ops(&dma_iommu_ops);
 618
 619         /* Configure MSIs */
 620 #ifdef CONFIG_PCI_MSI
 621         ppc_md.msi_check_device = pnv_msi_check_device;
 622         ppc_md.setup_msi_irqs = pnv_setup_msi_irqs;
 623         ppc_md.teardown_msi_irqs = pnv_teardown_msi_irqs;
 624 #endif
 625 }