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