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