drivers/bcma/scan.c

   1 /*
   2  * Broadcom specific AMBA
   3  * Bus scanning
   4  *
   5  * Licensed under the GNU/GPL. See COPYING for details.
   6  */
   7
   8 #include "scan.h"
   9 #include "bcma_private.h"
  10
  11 #include <linux/bcma/bcma.h>
  12 #include <linux/bcma/bcma_regs.h>
  13 #include <linux/pci.h>
  14 #include <linux/io.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/slab.h>
  17
  18 struct bcma_device_id_name {
  19         u16 id;
  20         const char *name;
  21 };
  22
  23 static const struct bcma_device_id_name bcma_arm_device_names[] = {
  24         { BCMA_CORE_ARM_1176, "ARM 1176" },
  25         { BCMA_CORE_ARM_7TDMI, "ARM 7TDMI" },
  26         { BCMA_CORE_ARM_CM3, "ARM CM3" },
  27 };
  28
  29 static const struct bcma_device_id_name bcma_bcm_device_names[] = {
  30         { BCMA_CORE_OOB_ROUTER, "OOB Router" },
  31         { BCMA_CORE_INVALID, "Invalid" },
  32         { BCMA_CORE_CHIPCOMMON, "ChipCommon" },
  33         { BCMA_CORE_ILINE20, "ILine 20" },
  34         { BCMA_CORE_SRAM, "SRAM" },
  35         { BCMA_CORE_SDRAM, "SDRAM" },
  36         { BCMA_CORE_PCI, "PCI" },
  37         { BCMA_CORE_ETHERNET, "Fast Ethernet" },
  38         { BCMA_CORE_V90, "V90" },
  39         { BCMA_CORE_USB11_HOSTDEV, "USB 1.1 Hostdev" },
  40         { BCMA_CORE_ADSL, "ADSL" },
  41         { BCMA_CORE_ILINE100, "ILine 100" },
  42         { BCMA_CORE_IPSEC, "IPSEC" },
  43         { BCMA_CORE_UTOPIA, "UTOPIA" },
  44         { BCMA_CORE_PCMCIA, "PCMCIA" },
  45         { BCMA_CORE_INTERNAL_MEM, "Internal Memory" },
  46         { BCMA_CORE_MEMC_SDRAM, "MEMC SDRAM" },
  47         { BCMA_CORE_OFDM, "OFDM" },
  48         { BCMA_CORE_EXTIF, "EXTIF" },
  49         { BCMA_CORE_80211, "IEEE 802.11" },
  50         { BCMA_CORE_PHY_A, "PHY A" },
  51         { BCMA_CORE_PHY_B, "PHY B" },
  52         { BCMA_CORE_PHY_G, "PHY G" },
  53         { BCMA_CORE_USB11_HOST, "USB 1.1 Host" },
  54         { BCMA_CORE_USB11_DEV, "USB 1.1 Device" },
  55         { BCMA_CORE_USB20_HOST, "USB 2.0 Host" },
  56         { BCMA_CORE_USB20_DEV, "USB 2.0 Device" },
  57         { BCMA_CORE_SDIO_HOST, "SDIO Host" },
  58         { BCMA_CORE_ROBOSWITCH, "Roboswitch" },
  59         { BCMA_CORE_PARA_ATA, "PATA" },
  60         { BCMA_CORE_SATA_XORDMA, "SATA XOR-DMA" },
  61         { BCMA_CORE_ETHERNET_GBIT, "GBit Ethernet" },
  62         { BCMA_CORE_PCIE, "PCIe" },
  63         { BCMA_CORE_PHY_N, "PHY N" },
  64         { BCMA_CORE_SRAM_CTL, "SRAM Controller" },
  65         { BCMA_CORE_MINI_MACPHY, "Mini MACPHY" },
  66         { BCMA_CORE_PHY_LP, "PHY LP" },
  67         { BCMA_CORE_PMU, "PMU" },
  68         { BCMA_CORE_PHY_SSN, "PHY SSN" },
  69         { BCMA_CORE_SDIO_DEV, "SDIO Device" },
  70         { BCMA_CORE_PHY_HT, "PHY HT" },
  71         { BCMA_CORE_MAC_GBIT, "GBit MAC" },
  72         { BCMA_CORE_DDR12_MEM_CTL, "DDR1/DDR2 Memory Controller" },
  73         { BCMA_CORE_PCIE_RC, "PCIe Root Complex" },
  74         { BCMA_CORE_OCP_OCP_BRIDGE, "OCP to OCP Bridge" },
  75         { BCMA_CORE_SHARED_COMMON, "Common Shared" },
  76         { BCMA_CORE_OCP_AHB_BRIDGE, "OCP to AHB Bridge" },
  77         { BCMA_CORE_SPI_HOST, "SPI Host" },
  78         { BCMA_CORE_I2S, "I2S" },
  79         { BCMA_CORE_SDR_DDR1_MEM_CTL, "SDR/DDR1 Memory Controller" },
  80         { BCMA_CORE_SHIM, "SHIM" },
  81         { BCMA_CORE_DEFAULT, "Default" },
  82 };
  83
  84 static const struct bcma_device_id_name bcma_mips_device_names[] = {
  85         { BCMA_CORE_MIPS, "MIPS" },
  86         { BCMA_CORE_MIPS_3302, "MIPS 3302" },
  87         { BCMA_CORE_MIPS_74K, "MIPS 74K" },
  88 };
  89
  90 static const char *bcma_device_name(const struct bcma_device_id *id)
  91 {
  92         const struct bcma_device_id_name *names;
  93         int size, i;
  94
  95         /* search manufacturer specific names */
  96         switch (id->manuf) {
  97         case BCMA_MANUF_ARM:
  98                 names = bcma_arm_device_names;
  99                 size = ARRAY_SIZE(bcma_arm_device_names);
 100                 break;
 101         case BCMA_MANUF_BCM:
 102                 names = bcma_bcm_device_names;
 103                 size = ARRAY_SIZE(bcma_bcm_device_names);
 104                 break;
 105         case BCMA_MANUF_MIPS:
 106                 names = bcma_mips_device_names;
 107                 size = ARRAY_SIZE(bcma_mips_device_names);
 108                 break;
 109         default:
 110                 return "UNKNOWN";
 111         }
 112
 113         for (i = 0; i < size; i++) {
 114                 if (names[i].id == id->id)
 115                         return names[i].name;
 116         }
 117
 118         return "UNKNOWN";
 119 }
 120
 121 static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
 122                        u16 offset)
 123 {
 124         return readl(bus->mmio + offset);
 125 }
 126
 127 static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
 128 {
 129         if (bus->hosttype == BCMA_HOSTTYPE_PCI)
 130                 pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
 131                                        addr);
 132 }
 133
 134 static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 **eromptr)
 135 {
 136         u32 ent = readl(*eromptr);
 137         (*eromptr)++;
 138         return ent;
 139 }
 140
 141 static void bcma_erom_push_ent(u32 **eromptr)
 142 {
 143         (*eromptr)--;
 144 }
 145
 146 static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 **eromptr)
 147 {
 148         u32 ent = bcma_erom_get_ent(bus, eromptr);
 149         if (!(ent & SCAN_ER_VALID))
 150                 return -ENOENT;
 151         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
 152                 return -ENOENT;
 153         return ent;
 154 }
 155
 156 static bool bcma_erom_is_end(struct bcma_bus *bus, u32 **eromptr)
 157 {
 158         u32 ent = bcma_erom_get_ent(bus, eromptr);
 159         bcma_erom_push_ent(eromptr);
 160         return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
 161 }
 162
 163 static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 **eromptr)
 164 {
 165         u32 ent = bcma_erom_get_ent(bus, eromptr);
 166         bcma_erom_push_ent(eromptr);
 167         return (((ent & SCAN_ER_VALID)) &&
 168                 ((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
 169                 ((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
 170 }
 171
 172 static void bcma_erom_skip_component(struct bcma_bus *bus, u32 **eromptr)
 173 {
 174         u32 ent;
 175         while (1) {
 176                 ent = bcma_erom_get_ent(bus, eromptr);
 177                 if ((ent & SCAN_ER_VALID) &&
 178                     ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
 179                         break;
 180                 if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
 181                         break;
 182         }
 183         bcma_erom_push_ent(eromptr);
 184 }
 185
 186 static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 **eromptr)
 187 {
 188         u32 ent = bcma_erom_get_ent(bus, eromptr);
 189         if (!(ent & SCAN_ER_VALID))
 190                 return -ENOENT;
 191         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
 192                 return -ENOENT;
 193         return ent;
 194 }
 195
 196 static s32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 **eromptr,
 197                                   u32 type, u8 port)
 198 {
 199         u32 addrl, addrh, sizel, sizeh = 0;
 200         u32 size;
 201
 202         u32 ent = bcma_erom_get_ent(bus, eromptr);
 203         if ((!(ent & SCAN_ER_VALID)) ||
 204             ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
 205             ((ent & SCAN_ADDR_TYPE) != type) ||
 206             (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
 207                 bcma_erom_push_ent(eromptr);
 208                 return -EINVAL;
 209         }
 210
 211         addrl = ent & SCAN_ADDR_ADDR;
 212         if (ent & SCAN_ADDR_AG32)
 213                 addrh = bcma_erom_get_ent(bus, eromptr);
 214         else
 215                 addrh = 0;
 216
 217         if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
 218                 size = bcma_erom_get_ent(bus, eromptr);
 219                 sizel = size & SCAN_SIZE_SZ;
 220                 if (size & SCAN_SIZE_SG32)
 221                         sizeh = bcma_erom_get_ent(bus, eromptr);
 222         } else
 223                 sizel = SCAN_ADDR_SZ_BASE <<
 224                                 ((ent & SCAN_ADDR_SZ) >> SCAN_ADDR_SZ_SHIFT);
 225
 226         return addrl;
 227 }
 228
 229 static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
 230                                                    u16 index)
 231 {
 232         struct bcma_device *core;
 233
 234         list_for_each_entry(core, &bus->cores, list) {
 235                 if (core->core_index == index)
 236                         return core;
 237         }
 238         return NULL;
 239 }
 240
 241 static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
 242 {
 243         struct bcma_device *core;
 244
 245         list_for_each_entry_reverse(core, &bus->cores, list) {
 246                 if (core->id.id == coreid)
 247                         return core;
 248         }
 249         return NULL;
 250 }
 251
 252 static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 253                               struct bcma_device_id *match, int core_num,
 254                               struct bcma_device *core)
 255 {
 256         s32 tmp;
 257         u8 i, j;
 258         s32 cia, cib;
 259         u8 ports[2], wrappers[2];
 260
 261         /* get CIs */
 262         cia = bcma_erom_get_ci(bus, eromptr);
 263         if (cia < 0) {
 264                 bcma_erom_push_ent(eromptr);
 265                 if (bcma_erom_is_end(bus, eromptr))
 266                         return -ESPIPE;
 267                 return -EILSEQ;
 268         }
 269         cib = bcma_erom_get_ci(bus, eromptr);
 270         if (cib < 0)
 271                 return -EILSEQ;
 272
 273         /* parse CIs */
 274         core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 275         core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 276         core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 277         ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 278         ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 279         wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 280         wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 281         core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 282
 283         if (((core->id.manuf == BCMA_MANUF_ARM) &&
 284              (core->id.id == 0xFFF)) ||
 285             (ports[1] == 0)) {
 286                 bcma_erom_skip_component(bus, eromptr);
 287                 return -ENXIO;
 288         }
 289
 290         /* check if component is a core at all */
 291         if (wrappers[0] + wrappers[1] == 0) {
 292                 /* we could save addrl of the router
 293                 if (cid == BCMA_CORE_OOB_ROUTER)
 294                  */
 295                 bcma_erom_skip_component(bus, eromptr);
 296                 return -ENXIO;
 297         }
 298
 299         if (bcma_erom_is_bridge(bus, eromptr)) {
 300                 bcma_erom_skip_component(bus, eromptr);
 301                 return -ENXIO;
 302         }
 303
 304         if (bcma_find_core_by_index(bus, core_num)) {
 305                 bcma_erom_skip_component(bus, eromptr);
 306                 return -ENODEV;
 307         }
 308
 309         if (match && ((match->manuf != BCMA_ANY_MANUF &&
 310               match->manuf != core->id.manuf) ||
 311              (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
 312              (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
 313              (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
 314             )) {
 315                 bcma_erom_skip_component(bus, eromptr);
 316                 return -ENODEV;
 317         }
 318
 319         /* get & parse master ports */
 320         for (i = 0; i < ports[0]; i++) {
 321                 s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
 322                 if (mst_port_d < 0)
 323                         return -EILSEQ;
 324         }
 325
 326         /* First Slave Address Descriptor should be port 0:
 327          * the main register space for the core
 328          */
 329         tmp = bcma_erom_get_addr_desc(bus, eromptr, SCAN_ADDR_TYPE_SLAVE, 0);
 330         if (tmp <= 0) {
 331                 /* Try again to see if it is a bridge */
 332                 tmp = bcma_erom_get_addr_desc(bus, eromptr,
 333                                               SCAN_ADDR_TYPE_BRIDGE, 0);
 334                 if (tmp <= 0) {
 335                         return -EILSEQ;
 336                 } else {
 337                         pr_info("Bridge found\n");
 338                         return -ENXIO;
 339                 }
 340         }
 341         core->addr = tmp;
 342
 343         /* get & parse slave ports */
 344         for (i = 0; i < ports[1]; i++) {
 345                 for (j = 0; ; j++) {
 346                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 347                                 SCAN_ADDR_TYPE_SLAVE, i);
 348                         if (tmp < 0) {
 349                                 /* no more entries for port _i_ */
 350                                 /* pr_debug("erom: slave port %d "
 351                                  * "has %d descriptors\n", i, j); */
 352                                 break;
 353                         } else {
 354                                 if (i == 0 && j == 0)
 355                                         core->addr1 = tmp;
 356                         }
 357                 }
 358         }
 359
 360         /* get & parse master wrappers */
 361         for (i = 0; i < wrappers[0]; i++) {
 362                 for (j = 0; ; j++) {
 363                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 364                                 SCAN_ADDR_TYPE_MWRAP, i);
 365                         if (tmp < 0) {
 366                                 /* no more entries for port _i_ */
 367                                 /* pr_debug("erom: master wrapper %d "
 368                                  * "has %d descriptors\n", i, j); */
 369                                 break;
 370                         } else {
 371                                 if (i == 0 && j == 0)
 372                                         core->wrap = tmp;
 373                         }
 374                 }
 375         }
 376
 377         /* get & parse slave wrappers */
 378         for (i = 0; i < wrappers[1]; i++) {
 379                 u8 hack = (ports[1] == 1) ? 0 : 1;
 380                 for (j = 0; ; j++) {
 381                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 382                                 SCAN_ADDR_TYPE_SWRAP, i + hack);
 383                         if (tmp < 0) {
 384                                 /* no more entries for port _i_ */
 385                                 /* pr_debug("erom: master wrapper %d "
 386                                  * has %d descriptors\n", i, j); */
 387                                 break;
 388                         } else {
 389                                 if (wrappers[0] == 0 && !i && !j)
 390                                         core->wrap = tmp;
 391                         }
 392                 }
 393         }
 394         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 395                 core->io_addr = ioremap_nocache(core->addr, BCMA_CORE_SIZE);
 396                 if (!core->io_addr)
 397                         return -ENOMEM;
 398                 core->io_wrap = ioremap_nocache(core->wrap, BCMA_CORE_SIZE);
 399                 if (!core->io_wrap) {
 400                         iounmap(core->io_addr);
 401                         return -ENOMEM;
 402                 }
 403         }
 404         return 0;
 405 }
 406
 407 void bcma_init_bus(struct bcma_bus *bus)
 408 {
 409         s32 tmp;
 410         struct bcma_chipinfo *chipinfo = &(bus->chipinfo);
 411
 412         if (bus->init_done)
 413                 return;
 414
 415         INIT_LIST_HEAD(&bus->cores);
 416         bus->nr_cores = 0;
 417
 418         bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
 419
 420         tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
 421         chipinfo->id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
 422         chipinfo->rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
 423         chipinfo->pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
 424         pr_info("Found chip with id 0x%04X, rev 0x%02X and package 0x%02X\n",
 425                 chipinfo->id, chipinfo->rev, chipinfo->pkg);
 426
 427         bus->init_done = true;
 428 }
 429
 430 int bcma_bus_scan(struct bcma_bus *bus)
 431 {
 432         u32 erombase;
 433         u32 __iomem *eromptr, *eromend;
 434
 435         int err, core_num = 0;
 436
 437         bcma_init_bus(bus);
 438
 439         erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 440         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 441                 eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 442                 if (!eromptr)
 443                         return -ENOMEM;
 444         } else {
 445                 eromptr = bus->mmio;
 446         }
 447
 448         eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 449
 450         bcma_scan_switch_core(bus, erombase);
 451
 452         while (eromptr < eromend) {
 453                 struct bcma_device *other_core;
 454                 struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
 455                 if (!core)
 456                         return -ENOMEM;
 457                 INIT_LIST_HEAD(&core->list);
 458                 core->bus = bus;
 459
 460                 err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
 461                 if (err < 0) {
 462                         kfree(core);
 463                         if (err == -ENODEV) {
 464                                 core_num++;
 465                                 continue;
 466                         } else if (err == -ENXIO) {
 467                                 continue;
 468                         } else if (err == -ESPIPE) {
 469                                 break;
 470                         }
 471                         return err;
 472                 }
 473
 474                 core->core_index = core_num++;
 475                 bus->nr_cores++;
 476                 other_core = bcma_find_core_reverse(bus, core->id.id);
 477                 core->core_unit = (other_core == NULL) ? 0 : other_core->core_unit + 1;
 478
 479                 pr_info("Core %d found: %s "
 480                         "(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 481                         core->core_index, bcma_device_name(&core->id),
 482                         core->id.manuf, core->id.id, core->id.rev,
 483                         core->id.class);
 484
 485                 list_add(&core->list, &bus->cores);
 486         }
 487
 488         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 489                 iounmap(eromptr);
 490
 491         return 0;
 492 }
 493
 494 int __init bcma_bus_scan_early(struct bcma_bus *bus,
 495                                struct bcma_device_id *match,
 496                                struct bcma_device *core)
 497 {
 498         u32 erombase;
 499         u32 __iomem *eromptr, *eromend;
 500
 501         int err = -ENODEV;
 502         int core_num = 0;
 503
 504         erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 505         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 506                 eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 507                 if (!eromptr)
 508                         return -ENOMEM;
 509         } else {
 510                 eromptr = bus->mmio;
 511         }
 512
 513         eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 514
 515         bcma_scan_switch_core(bus, erombase);
 516
 517         while (eromptr < eromend) {
 518                 memset(core, 0, sizeof(*core));
 519                 INIT_LIST_HEAD(&core->list);
 520                 core->bus = bus;
 521
 522                 err = bcma_get_next_core(bus, &eromptr, match, core_num, core);
 523                 if (err == -ENODEV) {
 524                         core_num++;
 525                         continue;
 526                 } else if (err == -ENXIO)
 527                         continue;
 528                 else if (err == -ESPIPE)
 529                         break;
 530                 else if (err < 0)
 531                         return err;
 532
 533                 core->core_index = core_num++;
 534                 bus->nr_cores++;
 535                 pr_info("Core %d found: %s "
 536                         "(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 537                         core->core_index, bcma_device_name(&core->id),
 538                         core->id.manuf, core->id.id, core->id.rev,
 539                         core->id.class);
 540
 541                 list_add(&core->list, &bus->cores);
 542                 err = 0;
 543                 break;
 544         }
 545
 546         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 547                 iounmap(eromptr);
 548
 549         return err;
 550 }