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};
  22
  23static const struct bcma_device_id_name bcma_arm_device_names[] = {
  24        { BCMA_CORE_4706_MAC_GBIT_COMMON, "BCM4706 GBit MAC Common" },
  25        { BCMA_CORE_ARM_1176, "ARM 1176" },
  26        { BCMA_CORE_ARM_7TDMI, "ARM 7TDMI" },
  27        { BCMA_CORE_ARM_CM3, "ARM CM3" },
  28};
  29
  30static const struct bcma_device_id_name bcma_bcm_device_names[] = {
  31        { BCMA_CORE_OOB_ROUTER, "OOB Router" },
  32        { BCMA_CORE_4706_CHIPCOMMON, "BCM4706 ChipCommon" },
  33        { BCMA_CORE_4706_SOC_RAM, "BCM4706 SOC RAM" },
  34        { BCMA_CORE_4706_MAC_GBIT, "BCM4706 GBit MAC" },
  35        { BCMA_CORE_NS_PCIEG2, "PCIe Gen 2" },
  36        { BCMA_CORE_NS_DMA, "DMA" },
  37        { BCMA_CORE_NS_SDIO3, "SDIO3" },
  38        { BCMA_CORE_NS_USB20, "USB 2.0" },
  39        { BCMA_CORE_NS_USB30, "USB 3.0" },
  40        { BCMA_CORE_NS_A9JTAG, "ARM Cortex A9 JTAG" },
  41        { BCMA_CORE_NS_DDR23, "Denali DDR2/DDR3 memory controller" },
  42        { BCMA_CORE_NS_ROM, "ROM" },
  43        { BCMA_CORE_NS_NAND, "NAND flash controller" },
  44        { BCMA_CORE_NS_QSPI, "SPI flash controller" },
  45        { BCMA_CORE_NS_CHIPCOMMON_B, "Chipcommon B" },
  46        { BCMA_CORE_ARMCA9, "ARM Cortex A9 core (ihost)" },
  47        { BCMA_CORE_AMEMC, "AMEMC (DDR)" },
  48        { BCMA_CORE_ALTA, "ALTA (I2S)" },
  49        { BCMA_CORE_INVALID, "Invalid" },
  50        { BCMA_CORE_CHIPCOMMON, "ChipCommon" },
  51        { BCMA_CORE_ILINE20, "ILine 20" },
  52        { BCMA_CORE_SRAM, "SRAM" },
  53        { BCMA_CORE_SDRAM, "SDRAM" },
  54        { BCMA_CORE_PCI, "PCI" },
  55        { BCMA_CORE_ETHERNET, "Fast Ethernet" },
  56        { BCMA_CORE_V90, "V90" },
  57        { BCMA_CORE_USB11_HOSTDEV, "USB 1.1 Hostdev" },
  58        { BCMA_CORE_ADSL, "ADSL" },
  59        { BCMA_CORE_ILINE100, "ILine 100" },
  60        { BCMA_CORE_IPSEC, "IPSEC" },
  61        { BCMA_CORE_UTOPIA, "UTOPIA" },
  62        { BCMA_CORE_PCMCIA, "PCMCIA" },
  63        { BCMA_CORE_INTERNAL_MEM, "Internal Memory" },
  64        { BCMA_CORE_MEMC_SDRAM, "MEMC SDRAM" },
  65        { BCMA_CORE_OFDM, "OFDM" },
  66        { BCMA_CORE_EXTIF, "EXTIF" },
  67        { BCMA_CORE_80211, "IEEE 802.11" },
  68        { BCMA_CORE_PHY_A, "PHY A" },
  69        { BCMA_CORE_PHY_B, "PHY B" },
  70        { BCMA_CORE_PHY_G, "PHY G" },
  71        { BCMA_CORE_USB11_HOST, "USB 1.1 Host" },
  72        { BCMA_CORE_USB11_DEV, "USB 1.1 Device" },
  73        { BCMA_CORE_USB20_HOST, "USB 2.0 Host" },
  74        { BCMA_CORE_USB20_DEV, "USB 2.0 Device" },
  75        { BCMA_CORE_SDIO_HOST, "SDIO Host" },
  76        { BCMA_CORE_ROBOSWITCH, "Roboswitch" },
  77        { BCMA_CORE_PARA_ATA, "PATA" },
  78        { BCMA_CORE_SATA_XORDMA, "SATA XOR-DMA" },
  79        { BCMA_CORE_ETHERNET_GBIT, "GBit Ethernet" },
  80        { BCMA_CORE_PCIE, "PCIe" },
  81        { BCMA_CORE_PHY_N, "PHY N" },
  82        { BCMA_CORE_SRAM_CTL, "SRAM Controller" },
  83        { BCMA_CORE_MINI_MACPHY, "Mini MACPHY" },
  84        { BCMA_CORE_PHY_LP, "PHY LP" },
  85        { BCMA_CORE_PMU, "PMU" },
  86        { BCMA_CORE_PHY_SSN, "PHY SSN" },
  87        { BCMA_CORE_SDIO_DEV, "SDIO Device" },
  88        { BCMA_CORE_PHY_HT, "PHY HT" },
  89        { BCMA_CORE_MAC_GBIT, "GBit MAC" },
  90        { BCMA_CORE_DDR12_MEM_CTL, "DDR1/DDR2 Memory Controller" },
  91        { BCMA_CORE_PCIE_RC, "PCIe Root Complex" },
  92        { BCMA_CORE_OCP_OCP_BRIDGE, "OCP to OCP Bridge" },
  93        { BCMA_CORE_SHARED_COMMON, "Common Shared" },
  94        { BCMA_CORE_OCP_AHB_BRIDGE, "OCP to AHB Bridge" },
  95        { BCMA_CORE_SPI_HOST, "SPI Host" },
  96        { BCMA_CORE_I2S, "I2S" },
  97        { BCMA_CORE_SDR_DDR1_MEM_CTL, "SDR/DDR1 Memory Controller" },
  98        { BCMA_CORE_SHIM, "SHIM" },
  99        { BCMA_CORE_PCIE2, "PCIe Gen2" },
 100        { BCMA_CORE_ARM_CR4, "ARM CR4" },
 101        { BCMA_CORE_GCI, "GCI" },
 102        { BCMA_CORE_CMEM, "CNDS DDR2/3 memory controller" },
 103        { BCMA_CORE_ARM_CA7, "ARM CA7" },
 104        { BCMA_CORE_DEFAULT, "Default" },
 105};
 106
 107static const struct bcma_device_id_name bcma_mips_device_names[] = {
 108        { BCMA_CORE_MIPS, "MIPS" },
 109        { BCMA_CORE_MIPS_3302, "MIPS 3302" },
 110        { BCMA_CORE_MIPS_74K, "MIPS 74K" },
 111};
 112
 113static const char *bcma_device_name(const struct bcma_device_id *id)
 114{
 115        const struct bcma_device_id_name *names;
 116        int size, i;
 117
 118        /* search manufacturer specific names */
 119        switch (id->manuf) {
 120        case BCMA_MANUF_ARM:
 121                names = bcma_arm_device_names;
 122                size = ARRAY_SIZE(bcma_arm_device_names);
 123                break;
 124        case BCMA_MANUF_BCM:
 125                names = bcma_bcm_device_names;
 126                size = ARRAY_SIZE(bcma_bcm_device_names);
 127                break;
 128        case BCMA_MANUF_MIPS:
 129                names = bcma_mips_device_names;
 130                size = ARRAY_SIZE(bcma_mips_device_names);
 131                break;
 132        default:
 133                return "UNKNOWN";
 134        }
 135
 136        for (i = 0; i < size; i++) {
 137                if (names[i].id == id->id)
 138                        return names[i].name;
 139        }
 140
 141        return "UNKNOWN";
 142}
 143
 144static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
 145                       u16 offset)
 146{
 147        return readl(bus->mmio + offset);
 148}
 149
 150static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
 151{
 152        if (bus->hosttype == BCMA_HOSTTYPE_PCI)
 153                pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
 154                                       addr);
 155}
 156
 157static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 __iomem **eromptr)
 158{
 159        u32 ent = readl(*eromptr);
 160        (*eromptr)++;
 161        return ent;
 162}
 163
 164static void bcma_erom_push_ent(u32 __iomem **eromptr)
 165{
 166        (*eromptr)--;
 167}
 168
 169static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 __iomem **eromptr)
 170{
 171        u32 ent = bcma_erom_get_ent(bus, eromptr);
 172        if (!(ent & SCAN_ER_VALID))
 173                return -ENOENT;
 174        if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
 175                return -ENOENT;
 176        return ent;
 177}
 178
 179static bool bcma_erom_is_end(struct bcma_bus *bus, u32 __iomem **eromptr)
 180{
 181        u32 ent = bcma_erom_get_ent(bus, eromptr);
 182        bcma_erom_push_ent(eromptr);
 183        return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
 184}
 185
 186static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 __iomem **eromptr)
 187{
 188        u32 ent = bcma_erom_get_ent(bus, eromptr);
 189        bcma_erom_push_ent(eromptr);
 190        return (((ent & SCAN_ER_VALID)) &&
 191                ((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
 192                ((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
 193}
 194
 195static void bcma_erom_skip_component(struct bcma_bus *bus, u32 __iomem **eromptr)
 196{
 197        u32 ent;
 198        while (1) {
 199                ent = bcma_erom_get_ent(bus, eromptr);
 200                if ((ent & SCAN_ER_VALID) &&
 201                    ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
 202                        break;
 203                if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
 204                        break;
 205        }
 206        bcma_erom_push_ent(eromptr);
 207}
 208
 209static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 __iomem **eromptr)
 210{
 211        u32 ent = bcma_erom_get_ent(bus, eromptr);
 212        if (!(ent & SCAN_ER_VALID))
 213                return -ENOENT;
 214        if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
 215                return -ENOENT;
 216        return ent;
 217}
 218
 219static u32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 __iomem **eromptr,
 220                                  u32 type, u8 port)
 221{
 222        u32 addrl;
 223        u32 size;
 224
 225        u32 ent = bcma_erom_get_ent(bus, eromptr);
 226        if ((!(ent & SCAN_ER_VALID)) ||
 227            ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
 228            ((ent & SCAN_ADDR_TYPE) != type) ||
 229            (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
 230                bcma_erom_push_ent(eromptr);
 231                return (u32)-EINVAL;
 232        }
 233
 234        addrl = ent & SCAN_ADDR_ADDR;
 235        if (ent & SCAN_ADDR_AG32)
 236                bcma_erom_get_ent(bus, eromptr);
 237
 238        if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
 239                size = bcma_erom_get_ent(bus, eromptr);
 240                if (size & SCAN_SIZE_SG32)
 241                        bcma_erom_get_ent(bus, eromptr);
 242        }
 243
 244        return addrl;
 245}
 246
 247static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
 248                                                   u16 index)
 249{
 250        struct bcma_device *core;
 251
 252        list_for_each_entry(core, &bus->cores, list) {
 253                if (core->core_index == index)
 254                        return core;
 255        }
 256        return NULL;
 257}
 258
 259static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
 260{
 261        struct bcma_device *core;
 262
 263        list_for_each_entry_reverse(core, &bus->cores, list) {
 264                if (core->id.id == coreid)
 265                        return core;
 266        }
 267        return NULL;
 268}
 269
 270#define IS_ERR_VALUE_U32(x) ((x) >= (u32)-MAX_ERRNO)
 271
 272static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 273                              struct bcma_device_id *match, int core_num,
 274                              struct bcma_device *core)
 275{
 276        u32 tmp;
 277        u8 i, j, k;
 278        s32 cia, cib;
 279        u8 ports[2], wrappers[2];
 280
 281        /* get CIs */
 282        cia = bcma_erom_get_ci(bus, eromptr);
 283        if (cia < 0) {
 284                bcma_erom_push_ent(eromptr);
 285                if (bcma_erom_is_end(bus, eromptr))
 286                        return -ESPIPE;
 287                return -EILSEQ;
 288        }
 289        cib = bcma_erom_get_ci(bus, eromptr);
 290        if (cib < 0)
 291                return -EILSEQ;
 292
 293        /* parse CIs */
 294        core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 295        core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 296        core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 297        ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 298        ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 299        wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 300        wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 301        core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 302
 303        if (((core->id.manuf == BCMA_MANUF_ARM) &&
 304             (core->id.id == 0xFFF)) ||
 305            (ports[1] == 0)) {
 306                bcma_erom_skip_component(bus, eromptr);
 307                return -ENXIO;
 308        }
 309
 310        /* check if component is a core at all */
 311        if (wrappers[0] + wrappers[1] == 0) {
 312                /* Some specific cores don't need wrappers */
 313                switch (core->id.id) {
 314                case BCMA_CORE_4706_MAC_GBIT_COMMON:
 315                case BCMA_CORE_NS_CHIPCOMMON_B:
 316                case BCMA_CORE_PMU:
 317                case BCMA_CORE_GCI:
 318                /* Not used yet: case BCMA_CORE_OOB_ROUTER: */
 319                        break;
 320                default:
 321                        bcma_erom_skip_component(bus, eromptr);
 322                        return -ENXIO;
 323                }
 324        }
 325
 326        if (bcma_erom_is_bridge(bus, eromptr)) {
 327                bcma_erom_skip_component(bus, eromptr);
 328                return -ENXIO;
 329        }
 330
 331        if (bcma_find_core_by_index(bus, core_num)) {
 332                bcma_erom_skip_component(bus, eromptr);
 333                return -ENODEV;
 334        }
 335
 336        if (match && ((match->manuf != BCMA_ANY_MANUF &&
 337              match->manuf != core->id.manuf) ||
 338             (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
 339             (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
 340             (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
 341            )) {
 342                bcma_erom_skip_component(bus, eromptr);
 343                return -ENODEV;
 344        }
 345
 346        /* get & parse master ports */
 347        for (i = 0; i < ports[0]; i++) {
 348                s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
 349                if (mst_port_d < 0)
 350                        return -EILSEQ;
 351        }
 352
 353        /* First Slave Address Descriptor should be port 0:
 354         * the main register space for the core
 355         */
 356        tmp = bcma_erom_get_addr_desc(bus, eromptr, SCAN_ADDR_TYPE_SLAVE, 0);
 357        if (tmp == 0 || IS_ERR_VALUE_U32(tmp)) {
 358                /* Try again to see if it is a bridge */
 359                tmp = bcma_erom_get_addr_desc(bus, eromptr,
 360                                              SCAN_ADDR_TYPE_BRIDGE, 0);
 361                if (tmp == 0 || IS_ERR_VALUE_U32(tmp)) {
 362                        return -EILSEQ;
 363                } else {
 364                        bcma_info(bus, "Bridge found\n");
 365                        return -ENXIO;
 366                }
 367        }
 368        core->addr = tmp;
 369
 370        /* get & parse slave ports */
 371        k = 0;
 372        for (i = 0; i < ports[1]; i++) {
 373                for (j = 0; ; j++) {
 374                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 375                                SCAN_ADDR_TYPE_SLAVE, i);
 376                        if (IS_ERR_VALUE_U32(tmp)) {
 377                                /* no more entries for port _i_ */
 378                                /* pr_debug("erom: slave port %d "
 379                                 * "has %d descriptors\n", i, j); */
 380                                break;
 381                        } else if (k < ARRAY_SIZE(core->addr_s)) {
 382                                core->addr_s[k] = tmp;
 383                                k++;
 384                        }
 385                }
 386        }
 387
 388        /* get & parse master wrappers */
 389        for (i = 0; i < wrappers[0]; i++) {
 390                for (j = 0; ; j++) {
 391                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 392                                SCAN_ADDR_TYPE_MWRAP, i);
 393                        if (IS_ERR_VALUE_U32(tmp)) {
 394                                /* no more entries for port _i_ */
 395                                /* pr_debug("erom: master wrapper %d "
 396                                 * "has %d descriptors\n", i, j); */
 397                                break;
 398                        } else {
 399                                if (i == 0 && j == 0)
 400                                        core->wrap = tmp;
 401                        }
 402                }
 403        }
 404
 405        /* get & parse slave wrappers */
 406        for (i = 0; i < wrappers[1]; i++) {
 407                u8 hack = (ports[1] == 1) ? 0 : 1;
 408                for (j = 0; ; j++) {
 409                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 410                                SCAN_ADDR_TYPE_SWRAP, i + hack);
 411                        if (IS_ERR_VALUE_U32(tmp)) {
 412                                /* no more entries for port _i_ */
 413                                /* pr_debug("erom: master wrapper %d "
 414                                 * has %d descriptors\n", i, j); */
 415                                break;
 416                        } else {
 417                                if (wrappers[0] == 0 && !i && !j)
 418                                        core->wrap = tmp;
 419                        }
 420                }
 421        }
 422        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 423                core->io_addr = ioremap(core->addr, BCMA_CORE_SIZE);
 424                if (!core->io_addr)
 425                        return -ENOMEM;
 426                if (core->wrap) {
 427                        core->io_wrap = ioremap(core->wrap,
 428                                                        BCMA_CORE_SIZE);
 429                        if (!core->io_wrap) {
 430                                iounmap(core->io_addr);
 431                                return -ENOMEM;
 432                        }
 433                }
 434        }
 435        return 0;
 436}
 437
 438void bcma_detect_chip(struct bcma_bus *bus)
 439{
 440        s32 tmp;
 441        struct bcma_chipinfo *chipinfo = &(bus->chipinfo);
 442        char chip_id[8];
 443
 444        bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
 445
 446        tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
 447        chipinfo->id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
 448        chipinfo->rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
 449        chipinfo->pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
 450
 451        snprintf(chip_id, ARRAY_SIZE(chip_id),
 452                 (chipinfo->id > 0x9999) ? "%d" : "0x%04X", chipinfo->id);
 453        bcma_info(bus, "Found chip with id %s, rev 0x%02X and package 0x%02X\n",
 454                  chip_id, chipinfo->rev, chipinfo->pkg);
 455}
 456
 457int bcma_bus_scan(struct bcma_bus *bus)
 458{
 459        u32 erombase;
 460        u32 __iomem *eromptr, *eromend;
 461
 462        int err, core_num = 0;
 463
 464        /* Skip if bus was already scanned (e.g. during early register) */
 465        if (bus->nr_cores)
 466                return 0;
 467
 468        erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 469        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 470                eromptr = ioremap(erombase, BCMA_CORE_SIZE);
 471                if (!eromptr)
 472                        return -ENOMEM;
 473        } else {
 474                eromptr = bus->mmio;
 475        }
 476
 477        eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 478
 479        bcma_scan_switch_core(bus, erombase);
 480
 481        while (eromptr < eromend) {
 482                struct bcma_device *other_core;
 483                struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
 484                if (!core) {
 485                        err = -ENOMEM;
 486                        goto out;
 487                }
 488                INIT_LIST_HEAD(&core->list);
 489                core->bus = bus;
 490
 491                err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
 492                if (err < 0) {
 493                        kfree(core);
 494                        if (err == -ENODEV) {
 495                                core_num++;
 496                                continue;
 497                        } else if (err == -ENXIO) {
 498                                continue;
 499                        } else if (err == -ESPIPE) {
 500                                break;
 501                        }
 502                        goto out;
 503                }
 504
 505                core->core_index = core_num++;
 506                bus->nr_cores++;
 507                other_core = bcma_find_core_reverse(bus, core->id.id);
 508                core->core_unit = (other_core == NULL) ? 0 : other_core->core_unit + 1;
 509                bcma_prepare_core(bus, core);
 510
 511                bcma_info(bus, "Core %d found: %s (manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 512                          core->core_index, bcma_device_name(&core->id),
 513                          core->id.manuf, core->id.id, core->id.rev,
 514                          core->id.class);
 515
 516                list_add_tail(&core->list, &bus->cores);
 517        }
 518
 519        err = 0;
 520out:
 521        if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 522                iounmap(eromptr);
 523
 524        return err;
 525}
 526