arch/sparc/kernel/pci_common.c

   1 /* pci_common.c: PCI controller common support.
   2  *
   3  * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #include <linux/string.h>
   7 #include <linux/slab.h>
   8 #include <linux/pci.h>
   9 #include <linux/device.h>
  10 #include <linux/of_device.h>
  11
  12 #include <asm/prom.h>
  13 #include <asm/oplib.h>
  14
  15 #include "pci_impl.h"
  16 #include "pci_sun4v.h"
  17
  18 static int config_out_of_range(struct pci_pbm_info *pbm,
  19                                unsigned long bus,
  20                                unsigned long devfn,
  21                                unsigned long reg)
  22 {
  23         if (bus < pbm->pci_first_busno ||
  24             bus > pbm->pci_last_busno)
  25                 return 1;
  26         return 0;
  27 }
  28
  29 static void *sun4u_config_mkaddr(struct pci_pbm_info *pbm,
  30                                  unsigned long bus,
  31                                  unsigned long devfn,
  32                                  unsigned long reg)
  33 {
  34         unsigned long rbits = pbm->config_space_reg_bits;
  35
  36         if (config_out_of_range(pbm, bus, devfn, reg))
  37                 return NULL;
  38
  39         reg = (reg & ((1 << rbits) - 1));
  40         devfn <<= rbits;
  41         bus <<= rbits + 8;
  42
  43         return (void *) (pbm->config_space | bus | devfn | reg);
  44 }
  45
  46 /* At least on Sabre, it is necessary to access all PCI host controller
  47  * registers at their natural size, otherwise zeros are returned.
  48  * Strange but true, and I see no language in the UltraSPARC-IIi
  49  * programmer's manual that mentions this even indirectly.
  50  */
  51 static int sun4u_read_pci_cfg_host(struct pci_pbm_info *pbm,
  52                                    unsigned char bus, unsigned int devfn,
  53                                    int where, int size, u32 *value)
  54 {
  55         u32 tmp32, *addr;
  56         u16 tmp16;
  57         u8 tmp8;
  58
  59         addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
  60         if (!addr)
  61                 return PCIBIOS_SUCCESSFUL;
  62
  63         switch (size) {
  64         case 1:
  65                 if (where < 8) {
  66                         unsigned long align = (unsigned long) addr;
  67
  68                         align &= ~1;
  69                         pci_config_read16((u16 *)align, &tmp16);
  70                         if (where & 1)
  71                                 *value = tmp16 >> 8;
  72                         else
  73                                 *value = tmp16 & 0xff;
  74                 } else {
  75                         pci_config_read8((u8 *)addr, &tmp8);
  76                         *value = (u32) tmp8;
  77                 }
  78                 break;
  79
  80         case 2:
  81                 if (where < 8) {
  82                         pci_config_read16((u16 *)addr, &tmp16);
  83                         *value = (u32) tmp16;
  84                 } else {
  85                         pci_config_read8((u8 *)addr, &tmp8);
  86                         *value = (u32) tmp8;
  87                         pci_config_read8(((u8 *)addr) + 1, &tmp8);
  88                         *value |= ((u32) tmp8) << 8;
  89                 }
  90                 break;
  91
  92         case 4:
  93                 tmp32 = 0xffffffff;
  94                 sun4u_read_pci_cfg_host(pbm, bus, devfn,
  95                                         where, 2, &tmp32);
  96                 *value = tmp32;
  97
  98                 tmp32 = 0xffffffff;
  99                 sun4u_read_pci_cfg_host(pbm, bus, devfn,
 100                                         where + 2, 2, &tmp32);
 101                 *value |= tmp32 << 16;
 102                 break;
 103         }
 104         return PCIBIOS_SUCCESSFUL;
 105 }
 106
 107 static int sun4u_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 108                               int where, int size, u32 *value)
 109 {
 110         struct pci_pbm_info *pbm = bus_dev->sysdata;
 111         unsigned char bus = bus_dev->number;
 112         u32 *addr;
 113         u16 tmp16;
 114         u8 tmp8;
 115
 116         switch (size) {
 117         case 1:
 118                 *value = 0xff;
 119                 break;
 120         case 2:
 121                 *value = 0xffff;
 122                 break;
 123         case 4:
 124                 *value = 0xffffffff;
 125                 break;
 126         }
 127
 128         if (!bus_dev->number && !PCI_SLOT(devfn))
 129                 return sun4u_read_pci_cfg_host(pbm, bus, devfn, where,
 130                                                size, value);
 131
 132         addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 133         if (!addr)
 134                 return PCIBIOS_SUCCESSFUL;
 135
 136         switch (size) {
 137         case 1:
 138                 pci_config_read8((u8 *)addr, &tmp8);
 139                 *value = (u32) tmp8;
 140                 break;
 141
 142         case 2:
 143                 if (where & 0x01) {
 144                         printk("pci_read_config_word: misaligned reg [%x]\n",
 145                                where);
 146                         return PCIBIOS_SUCCESSFUL;
 147                 }
 148                 pci_config_read16((u16 *)addr, &tmp16);
 149                 *value = (u32) tmp16;
 150                 break;
 151
 152         case 4:
 153                 if (where & 0x03) {
 154                         printk("pci_read_config_dword: misaligned reg [%x]\n",
 155                                where);
 156                         return PCIBIOS_SUCCESSFUL;
 157                 }
 158                 pci_config_read32(addr, value);
 159                 break;
 160         }
 161         return PCIBIOS_SUCCESSFUL;
 162 }
 163
 164 static int sun4u_write_pci_cfg_host(struct pci_pbm_info *pbm,
 165                                     unsigned char bus, unsigned int devfn,
 166                                     int where, int size, u32 value)
 167 {
 168         u32 *addr;
 169
 170         addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 171         if (!addr)
 172                 return PCIBIOS_SUCCESSFUL;
 173
 174         switch (size) {
 175         case 1:
 176                 if (where < 8) {
 177                         unsigned long align = (unsigned long) addr;
 178                         u16 tmp16;
 179
 180                         align &= ~1;
 181                         pci_config_read16((u16 *)align, &tmp16);
 182                         if (where & 1) {
 183                                 tmp16 &= 0x00ff;
 184                                 tmp16 |= value << 8;
 185                         } else {
 186                                 tmp16 &= 0xff00;
 187                                 tmp16 |= value;
 188                         }
 189                         pci_config_write16((u16 *)align, tmp16);
 190                 } else
 191                         pci_config_write8((u8 *)addr, value);
 192                 break;
 193         case 2:
 194                 if (where < 8) {
 195                         pci_config_write16((u16 *)addr, value);
 196                 } else {
 197                         pci_config_write8((u8 *)addr, value & 0xff);
 198                         pci_config_write8(((u8 *)addr) + 1, value >> 8);
 199                 }
 200                 break;
 201         case 4:
 202                 sun4u_write_pci_cfg_host(pbm, bus, devfn,
 203                                          where, 2, value & 0xffff);
 204                 sun4u_write_pci_cfg_host(pbm, bus, devfn,
 205                                          where + 2, 2, value >> 16);
 206                 break;
 207         }
 208         return PCIBIOS_SUCCESSFUL;
 209 }
 210
 211 static int sun4u_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 212                                int where, int size, u32 value)
 213 {
 214         struct pci_pbm_info *pbm = bus_dev->sysdata;
 215         unsigned char bus = bus_dev->number;
 216         u32 *addr;
 217
 218         if (!bus_dev->number && !PCI_SLOT(devfn))
 219                 return sun4u_write_pci_cfg_host(pbm, bus, devfn, where,
 220                                                 size, value);
 221
 222         addr = sun4u_config_mkaddr(pbm, bus, devfn, where);
 223         if (!addr)
 224                 return PCIBIOS_SUCCESSFUL;
 225
 226         switch (size) {
 227         case 1:
 228                 pci_config_write8((u8 *)addr, value);
 229                 break;
 230
 231         case 2:
 232                 if (where & 0x01) {
 233                         printk("pci_write_config_word: misaligned reg [%x]\n",
 234                                where);
 235                         return PCIBIOS_SUCCESSFUL;
 236                 }
 237                 pci_config_write16((u16 *)addr, value);
 238                 break;
 239
 240         case 4:
 241                 if (where & 0x03) {
 242                         printk("pci_write_config_dword: misaligned reg [%x]\n",
 243                                where);
 244                         return PCIBIOS_SUCCESSFUL;
 245                 }
 246                 pci_config_write32(addr, value);
 247         }
 248         return PCIBIOS_SUCCESSFUL;
 249 }
 250
 251 struct pci_ops sun4u_pci_ops = {
 252         .read =         sun4u_read_pci_cfg,
 253         .write =        sun4u_write_pci_cfg,
 254 };
 255
 256 static int sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 257                               int where, int size, u32 *value)
 258 {
 259         struct pci_pbm_info *pbm = bus_dev->sysdata;
 260         u32 devhandle = pbm->devhandle;
 261         unsigned int bus = bus_dev->number;
 262         unsigned int device = PCI_SLOT(devfn);
 263         unsigned int func = PCI_FUNC(devfn);
 264         unsigned long ret;
 265
 266         if (config_out_of_range(pbm, bus, devfn, where)) {
 267                 ret = ~0UL;
 268         } else {
 269                 ret = pci_sun4v_config_get(devhandle,
 270                                 HV_PCI_DEVICE_BUILD(bus, device, func),
 271                                 where, size);
 272         }
 273         switch (size) {
 274         case 1:
 275                 *value = ret & 0xff;
 276                 break;
 277         case 2:
 278                 *value = ret & 0xffff;
 279                 break;
 280         case 4:
 281                 *value = ret & 0xffffffff;
 282                 break;
 283         }
 284
 285
 286         return PCIBIOS_SUCCESSFUL;
 287 }
 288
 289 static int sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
 290                                int where, int size, u32 value)
 291 {
 292         struct pci_pbm_info *pbm = bus_dev->sysdata;
 293         u32 devhandle = pbm->devhandle;
 294         unsigned int bus = bus_dev->number;
 295         unsigned int device = PCI_SLOT(devfn);
 296         unsigned int func = PCI_FUNC(devfn);
 297
 298         if (config_out_of_range(pbm, bus, devfn, where)) {
 299                 /* Do nothing. */
 300         } else {
 301                 /* We don't check for hypervisor errors here, but perhaps
 302                  * we should and influence our return value depending upon
 303                  * what kind of error is thrown.
 304                  */
 305                 pci_sun4v_config_put(devhandle,
 306                                      HV_PCI_DEVICE_BUILD(bus, device, func),
 307                                      where, size, value);
 308         }
 309         return PCIBIOS_SUCCESSFUL;
 310 }
 311
 312 struct pci_ops sun4v_pci_ops = {
 313         .read =         sun4v_read_pci_cfg,
 314         .write =        sun4v_write_pci_cfg,
 315 };
 316
 317 void pci_get_pbm_props(struct pci_pbm_info *pbm)
 318 {
 319         const u32 *val = of_get_property(pbm->op->dev.of_node, "bus-range", NULL);
 320
 321         pbm->pci_first_busno = val[0];
 322         pbm->pci_last_busno = val[1];
 323
 324         val = of_get_property(pbm->op->dev.of_node, "ino-bitmap", NULL);
 325         if (val) {
 326                 pbm->ino_bitmap = (((u64)val[1] << 32UL) |
 327                                    ((u64)val[0] <<  0UL));
 328         }
 329 }
 330
 331 static void pci_register_legacy_regions(struct resource *io_res,
 332                                         struct resource *mem_res)
 333 {
 334         struct resource *p;
 335
 336         /* VGA Video RAM. */
 337         p = kzalloc(sizeof(*p), GFP_KERNEL);
 338         if (!p)
 339                 return;
 340
 341         p->name = "Video RAM area";
 342         p->start = mem_res->start + 0xa0000UL;
 343         p->end = p->start + 0x1ffffUL;
 344         p->flags = IORESOURCE_BUSY;
 345         request_resource(mem_res, p);
 346
 347         p = kzalloc(sizeof(*p), GFP_KERNEL);
 348         if (!p)
 349                 return;
 350
 351         p->name = "System ROM";
 352         p->start = mem_res->start + 0xf0000UL;
 353         p->end = p->start + 0xffffUL;
 354         p->flags = IORESOURCE_BUSY;
 355         request_resource(mem_res, p);
 356
 357         p = kzalloc(sizeof(*p), GFP_KERNEL);
 358         if (!p)
 359                 return;
 360
 361         p->name = "Video ROM";
 362         p->start = mem_res->start + 0xc0000UL;
 363         p->end = p->start + 0x7fffUL;
 364         p->flags = IORESOURCE_BUSY;
 365         request_resource(mem_res, p);
 366 }
 367
 368 static void pci_register_iommu_region(struct pci_pbm_info *pbm)
 369 {
 370         const u32 *vdma = of_get_property(pbm->op->dev.of_node, "virtual-dma",
 371                                           NULL);
 372
 373         if (vdma) {
 374                 struct resource *rp = kzalloc(sizeof(*rp), GFP_KERNEL);
 375
 376                 if (!rp) {
 377                         pr_info("%s: Cannot allocate IOMMU resource.\n",
 378                                 pbm->name);
 379                         return;
 380                 }
 381                 rp->name = "IOMMU";
 382                 rp->start = pbm->mem_space.start + (unsigned long) vdma[0];
 383                 rp->end = rp->start + (unsigned long) vdma[1] - 1UL;
 384                 rp->flags = IORESOURCE_BUSY;
 385                 if (request_resource(&pbm->mem_space, rp)) {
 386                         pr_info("%s: Unable to request IOMMU resource.\n",
 387                                 pbm->name);
 388                         kfree(rp);
 389                 }
 390         }
 391 }
 392
 393 void pci_determine_mem_io_space(struct pci_pbm_info *pbm)
 394 {
 395         const struct linux_prom_pci_ranges *pbm_ranges;
 396         int i, saw_mem, saw_io;
 397         int num_pbm_ranges;
 398
 399         saw_mem = saw_io = 0;
 400         pbm_ranges = of_get_property(pbm->op->dev.of_node, "ranges", &i);
 401         if (!pbm_ranges) {
 402                 prom_printf("PCI: Fatal error, missing PBM ranges property "
 403                             " for %s\n",
 404                             pbm->name);
 405                 prom_halt();
 406         }
 407
 408         num_pbm_ranges = i / sizeof(*pbm_ranges);
 409
 410         for (i = 0; i < num_pbm_ranges; i++) {
 411                 const struct linux_prom_pci_ranges *pr = &pbm_ranges[i];
 412                 unsigned long a, size;
 413                 u32 parent_phys_hi, parent_phys_lo;
 414                 u32 size_hi, size_lo;
 415                 int type;
 416
 417                 parent_phys_hi = pr->parent_phys_hi;
 418                 parent_phys_lo = pr->parent_phys_lo;
 419                 if (tlb_type == hypervisor)
 420                         parent_phys_hi &= 0x0fffffff;
 421
 422                 size_hi = pr->size_hi;
 423                 size_lo = pr->size_lo;
 424
 425                 type = (pr->child_phys_hi >> 24) & 0x3;
 426                 a = (((unsigned long)parent_phys_hi << 32UL) |
 427                      ((unsigned long)parent_phys_lo  <<  0UL));
 428                 size = (((unsigned long)size_hi << 32UL) |
 429                         ((unsigned long)size_lo  <<  0UL));
 430
 431                 switch (type) {
 432                 case 0:
 433                         /* PCI config space, 16MB */
 434                         pbm->config_space = a;
 435                         break;
 436
 437                 case 1:
 438                         /* 16-bit IO space, 16MB */
 439                         pbm->io_space.start = a;
 440                         pbm->io_space.end = a + size - 1UL;
 441                         pbm->io_space.flags = IORESOURCE_IO;
 442                         saw_io = 1;
 443                         break;
 444
 445                 case 2:
 446                         /* 32-bit MEM space, 2GB */
 447                         pbm->mem_space.start = a;
 448                         pbm->mem_space.end = a + size - 1UL;
 449                         pbm->mem_space.flags = IORESOURCE_MEM;
 450                         saw_mem = 1;
 451                         break;
 452
 453                 case 3:
 454                         /* XXX 64-bit MEM handling XXX */
 455
 456                 default:
 457                         break;
 458                 }
 459         }
 460
 461         if (!saw_io || !saw_mem) {
 462                 prom_printf("%s: Fatal error, missing %s PBM range.\n",
 463                             pbm->name,
 464                             (!saw_io ? "IO" : "MEM"));
 465                 prom_halt();
 466         }
 467
 468         printk("%s: PCI IO[%llx] MEM[%llx]\n",
 469                pbm->name,
 470                pbm->io_space.start,
 471                pbm->mem_space.start);
 472
 473         pbm->io_space.name = pbm->mem_space.name = pbm->name;
 474
 475         request_resource(&ioport_resource, &pbm->io_space);
 476         request_resource(&iomem_resource, &pbm->mem_space);
 477
 478         pci_register_legacy_regions(&pbm->io_space,
 479                                     &pbm->mem_space);
 480         pci_register_iommu_region(pbm);
 481 }
 482
 483 /* Generic helper routines for PCI error reporting. */
 484 void pci_scan_for_target_abort(struct pci_pbm_info *pbm,
 485                                struct pci_bus *pbus)
 486 {
 487         struct pci_dev *pdev;
 488         struct pci_bus *bus;
 489
 490         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 491                 u16 status, error_bits;
 492
 493                 pci_read_config_word(pdev, PCI_STATUS, &status);
 494                 error_bits =
 495                         (status & (PCI_STATUS_SIG_TARGET_ABORT |
 496                                    PCI_STATUS_REC_TARGET_ABORT));
 497                 if (error_bits) {
 498                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 499                         printk("%s: Device %s saw Target Abort [%016x]\n",
 500                                pbm->name, pci_name(pdev), status);
 501                 }
 502         }
 503
 504         list_for_each_entry(bus, &pbus->children, node)
 505                 pci_scan_for_target_abort(pbm, bus);
 506 }
 507
 508 void pci_scan_for_master_abort(struct pci_pbm_info *pbm,
 509                                struct pci_bus *pbus)
 510 {
 511         struct pci_dev *pdev;
 512         struct pci_bus *bus;
 513
 514         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 515                 u16 status, error_bits;
 516
 517                 pci_read_config_word(pdev, PCI_STATUS, &status);
 518                 error_bits =
 519                         (status & (PCI_STATUS_REC_MASTER_ABORT));
 520                 if (error_bits) {
 521                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 522                         printk("%s: Device %s received Master Abort [%016x]\n",
 523                                pbm->name, pci_name(pdev), status);
 524                 }
 525         }
 526
 527         list_for_each_entry(bus, &pbus->children, node)
 528                 pci_scan_for_master_abort(pbm, bus);
 529 }
 530
 531 void pci_scan_for_parity_error(struct pci_pbm_info *pbm,
 532                                struct pci_bus *pbus)
 533 {
 534         struct pci_dev *pdev;
 535         struct pci_bus *bus;
 536
 537         list_for_each_entry(pdev, &pbus->devices, bus_list) {
 538                 u16 status, error_bits;
 539
 540                 pci_read_config_word(pdev, PCI_STATUS, &status);
 541                 error_bits =
 542                         (status & (PCI_STATUS_PARITY |
 543                                    PCI_STATUS_DETECTED_PARITY));
 544                 if (error_bits) {
 545                         pci_write_config_word(pdev, PCI_STATUS, error_bits);
 546                         printk("%s: Device %s saw Parity Error [%016x]\n",
 547                                pbm->name, pci_name(pdev), status);
 548                 }
 549         }
 550
 551         list_for_each_entry(bus, &pbus->children, node)
 552                 pci_scan_for_parity_error(pbm, bus);
 553 }