linux/drivers/bcma/scan.c
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   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
  18struct bcma_device_id_name {
  19        u16 id;
  20        const char *name;
  21};
  22struct 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};
  82const 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
  95static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
  96                       u16 offset)
  97{
  98        return readl(bus->mmio + offset);
  99}
 100
 101static 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
 108static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 **eromptr)
 109{
 110        u32 ent = readl(*eromptr);
 111        (*eromptr)++;
 112        return ent;
 113}
 114
 115static void bcma_erom_push_ent(u32 **eromptr)
 116{
 117        (*eromptr)--;
 118}
 119
 120static 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
 130static 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
 137static 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
 146static 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
 160static 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
 170static 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
 203static 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
 215static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 216                              struct bcma_device_id *match, int core_num,
 217                              struct bcma_device *core)
 218{
 219        s32 tmp;
 220        u8 i, j;
 221        s32 cia, cib;
 222        u8 ports[2], wrappers[2];
 223
 224        /* get CIs */
 225        cia = bcma_erom_get_ci(bus, eromptr);
 226        if (cia < 0) {
 227                bcma_erom_push_ent(eromptr);
 228                if (bcma_erom_is_end(bus, eromptr))
 229                        return -ESPIPE;
 230                return -EILSEQ;
 231        }
 232        cib = bcma_erom_get_ci(bus, eromptr);
 233        if (cib < 0)
 234                return -EILSEQ;
 235
 236        /* parse CIs */
 237        core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 238        core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 239        core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 240        ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 241        ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 242        wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 243        wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 244        core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 245
 246        if (((core->id.manuf == BCMA_MANUF_ARM) &&
 247             (core->id.id == 0xFFF)) ||
 248            (ports[1] == 0)) {
 249                bcma_erom_skip_component(bus, eromptr);
 250                return -ENXIO;
 251        }
 252
 253        /* check if component is a core at all */
 254        if (wrappers[0] + wrappers[1] == 0) {
 255                /* we could save addrl of the router
 256                if (cid == BCMA_CORE_OOB_ROUTER)
 257                 */
 258                bcma_erom_skip_component(bus, eromptr);
 259                return -ENXIO;
 260        }
 261
 262        if (bcma_erom_is_bridge(bus, eromptr)) {
 263                bcma_erom_skip_component(bus, eromptr);
 264                return -ENXIO;
 265        }
 266
 267        if (bcma_find_core_by_index(bus, core_num)) {
 268                bcma_erom_skip_component(bus, eromptr);
 269                return -ENODEV;
 270        }
 271
 272        if (match && ((match->manuf != BCMA_ANY_MANUF &&
 273              match->manuf != core->id.manuf) ||
 274             (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
 275             (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
 276             (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
 277            )) {
 278                bcma_erom_skip_component(bus, eromptr);
 279                return -ENODEV;
 280        }
 281
 282        /* get & parse master ports */
 283        for (i = 0; i < ports[0]; i++) {
 284                s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
 285                if (mst_port_d < 0)
 286                        return -EILSEQ;
 287        }
 288
 289        /* get & parse slave ports */
 290        for (i = 0; i < ports[1]; i++) {
 291                for (j = 0; ; j++) {
 292                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 293                                SCAN_ADDR_TYPE_SLAVE, i);
 294                        if (tmp < 0) {
 295                                /* no more entries for port _i_ */
 296                                /* pr_debug("erom: slave port %d "
 297                                 * "has %d descriptors\n", i, j); */
 298                                break;
 299                        } else {
 300                                if (i == 0 && j == 0)
 301                                        core->addr = tmp;
 302                        }
 303                }
 304        }
 305
 306        /* get & parse master wrappers */
 307        for (i = 0; i < wrappers[0]; i++) {
 308                for (j = 0; ; j++) {
 309                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 310                                SCAN_ADDR_TYPE_MWRAP, i);
 311                        if (tmp < 0) {
 312                                /* no more entries for port _i_ */
 313                                /* pr_debug("erom: master wrapper %d "
 314                                 * "has %d descriptors\n", i, j); */
 315                                break;
 316                        } else {
 317                                if (i == 0 && j == 0)
 318                                        core->wrap = tmp;
 319                        }
 320                }
 321        }
 322
 323        /* get & parse slave wrappers */
 324        for (i = 0; i < wrappers[1]; i++) {
 325                u8 hack = (ports[1] == 1) ? 0 : 1;
 326                for (j = 0; ; j++) {
 327                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 328                                SCAN_ADDR_TYPE_SWRAP, i + hack);
 329                        if (tmp < 0) {
 330                                /* no more entries for port _i_ */
 331                                /* pr_debug("erom: master wrapper %d "
 332                                 * has %d descriptors\n", i, j); */
 333                                break;
 334                        } else {
 335                                if (wrappers[0] == 0 && !i && !j)
 336                                        core->wrap = tmp;
 337                        }
 338                }
 339        }
 340        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 341                core->io_addr = ioremap_nocache(core->addr, BCMA_CORE_SIZE);
 342                if (!core->io_addr)
 343                        return -ENOMEM;
 344                core->io_wrap = ioremap_nocache(core->wrap, BCMA_CORE_SIZE);
 345                if (!core->io_wrap) {
 346                        iounmap(core->io_addr);
 347                        return -ENOMEM;
 348                }
 349        }
 350        return 0;
 351}
 352
 353void bcma_init_bus(struct bcma_bus *bus)
 354{
 355        s32 tmp;
 356
 357        if (bus->init_done)
 358                return;
 359
 360        INIT_LIST_HEAD(&bus->cores);
 361        bus->nr_cores = 0;
 362
 363        bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
 364
 365        tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
 366        bus->chipinfo.id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
 367        bus->chipinfo.rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
 368        bus->chipinfo.pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
 369        bus->init_done = true;
 370}
 371
 372int bcma_bus_scan(struct bcma_bus *bus)
 373{
 374        u32 erombase;
 375        u32 __iomem *eromptr, *eromend;
 376
 377        int err, core_num = 0;
 378
 379        bcma_init_bus(bus);
 380
 381        erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 382        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 383                eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 384                if (!eromptr)
 385                        return -ENOMEM;
 386        } else {
 387                eromptr = bus->mmio;
 388        }
 389
 390        eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 391
 392        bcma_scan_switch_core(bus, erombase);
 393
 394        while (eromptr < eromend) {
 395                struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
 396                if (!core)
 397                        return -ENOMEM;
 398                INIT_LIST_HEAD(&core->list);
 399                core->bus = bus;
 400
 401                err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
 402                if (err < 0) {
 403                        kfree(core);
 404                        if (err == -ENODEV) {
 405                                core_num++;
 406                                continue;
 407                        } else if (err == -ENXIO) {
 408                                continue;
 409                        } else if (err == -ESPIPE) {
 410                                break;
 411                        }
 412                        return err;
 413                }
 414
 415                core->core_index = core_num++;
 416                bus->nr_cores++;
 417
 418                pr_info("Core %d found: %s "
 419                        "(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 420                        core->core_index, bcma_device_name(&core->id),
 421                        core->id.manuf, core->id.id, core->id.rev,
 422                        core->id.class);
 423
 424                list_add(&core->list, &bus->cores);
 425        }
 426
 427        if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 428                iounmap(eromptr);
 429
 430        return 0;
 431}
 432
 433int __init bcma_bus_scan_early(struct bcma_bus *bus,
 434                               struct bcma_device_id *match,
 435                               struct bcma_device *core)
 436{
 437        u32 erombase;
 438        u32 __iomem *eromptr, *eromend;
 439
 440        int err = -ENODEV;
 441        int core_num = 0;
 442
 443        erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 444        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 445                eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 446                if (!eromptr)
 447                        return -ENOMEM;
 448        } else {
 449                eromptr = bus->mmio;
 450        }
 451
 452        eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 453
 454        bcma_scan_switch_core(bus, erombase);
 455
 456        while (eromptr < eromend) {
 457                memset(core, 0, sizeof(*core));
 458                INIT_LIST_HEAD(&core->list);
 459                core->bus = bus;
 460
 461                err = bcma_get_next_core(bus, &eromptr, match, core_num, core);
 462                if (err == -ENODEV) {
 463                        core_num++;
 464                        continue;
 465                } else if (err == -ENXIO)
 466                        continue;
 467                else if (err == -ESPIPE)
 468                        break;
 469                else if (err < 0)
 470                        return err;
 471
 472                core->core_index = core_num++;
 473                bus->nr_cores++;
 474                pr_info("Core %d found: %s "
 475                        "(manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 476                        core->core_index, bcma_device_name(&core->id),
 477                        core->id.manuf, core->id.id, core->id.rev,
 478                        core->id.class);
 479
 480                list_add(&core->list, &bus->cores);
 481                err = 0;
 482                break;
 483        }
 484
 485        if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 486                iounmap(eromptr);
 487
 488        return err;
 489}
 490