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_AMEMC, "AMEMC (DDR)" },
  36        { BCMA_CORE_ALTA, "ALTA (I2S)" },
  37        { BCMA_CORE_INVALID, "Invalid" },
  38        { BCMA_CORE_CHIPCOMMON, "ChipCommon" },
  39        { BCMA_CORE_ILINE20, "ILine 20" },
  40        { BCMA_CORE_SRAM, "SRAM" },
  41        { BCMA_CORE_SDRAM, "SDRAM" },
  42        { BCMA_CORE_PCI, "PCI" },
  43        { BCMA_CORE_ETHERNET, "Fast Ethernet" },
  44        { BCMA_CORE_V90, "V90" },
  45        { BCMA_CORE_USB11_HOSTDEV, "USB 1.1 Hostdev" },
  46        { BCMA_CORE_ADSL, "ADSL" },
  47        { BCMA_CORE_ILINE100, "ILine 100" },
  48        { BCMA_CORE_IPSEC, "IPSEC" },
  49        { BCMA_CORE_UTOPIA, "UTOPIA" },
  50        { BCMA_CORE_PCMCIA, "PCMCIA" },
  51        { BCMA_CORE_INTERNAL_MEM, "Internal Memory" },
  52        { BCMA_CORE_MEMC_SDRAM, "MEMC SDRAM" },
  53        { BCMA_CORE_OFDM, "OFDM" },
  54        { BCMA_CORE_EXTIF, "EXTIF" },
  55        { BCMA_CORE_80211, "IEEE 802.11" },
  56        { BCMA_CORE_PHY_A, "PHY A" },
  57        { BCMA_CORE_PHY_B, "PHY B" },
  58        { BCMA_CORE_PHY_G, "PHY G" },
  59        { BCMA_CORE_USB11_HOST, "USB 1.1 Host" },
  60        { BCMA_CORE_USB11_DEV, "USB 1.1 Device" },
  61        { BCMA_CORE_USB20_HOST, "USB 2.0 Host" },
  62        { BCMA_CORE_USB20_DEV, "USB 2.0 Device" },
  63        { BCMA_CORE_SDIO_HOST, "SDIO Host" },
  64        { BCMA_CORE_ROBOSWITCH, "Roboswitch" },
  65        { BCMA_CORE_PARA_ATA, "PATA" },
  66        { BCMA_CORE_SATA_XORDMA, "SATA XOR-DMA" },
  67        { BCMA_CORE_ETHERNET_GBIT, "GBit Ethernet" },
  68        { BCMA_CORE_PCIE, "PCIe" },
  69        { BCMA_CORE_PHY_N, "PHY N" },
  70        { BCMA_CORE_SRAM_CTL, "SRAM Controller" },
  71        { BCMA_CORE_MINI_MACPHY, "Mini MACPHY" },
  72        { BCMA_CORE_PHY_LP, "PHY LP" },
  73        { BCMA_CORE_PMU, "PMU" },
  74        { BCMA_CORE_PHY_SSN, "PHY SSN" },
  75        { BCMA_CORE_SDIO_DEV, "SDIO Device" },
  76        { BCMA_CORE_PHY_HT, "PHY HT" },
  77        { BCMA_CORE_MAC_GBIT, "GBit MAC" },
  78        { BCMA_CORE_DDR12_MEM_CTL, "DDR1/DDR2 Memory Controller" },
  79        { BCMA_CORE_PCIE_RC, "PCIe Root Complex" },
  80        { BCMA_CORE_OCP_OCP_BRIDGE, "OCP to OCP Bridge" },
  81        { BCMA_CORE_SHARED_COMMON, "Common Shared" },
  82        { BCMA_CORE_OCP_AHB_BRIDGE, "OCP to AHB Bridge" },
  83        { BCMA_CORE_SPI_HOST, "SPI Host" },
  84        { BCMA_CORE_I2S, "I2S" },
  85        { BCMA_CORE_SDR_DDR1_MEM_CTL, "SDR/DDR1 Memory Controller" },
  86        { BCMA_CORE_SHIM, "SHIM" },
  87        { BCMA_CORE_DEFAULT, "Default" },
  88};
  89
  90static const struct bcma_device_id_name bcma_mips_device_names[] = {
  91        { BCMA_CORE_MIPS, "MIPS" },
  92        { BCMA_CORE_MIPS_3302, "MIPS 3302" },
  93        { BCMA_CORE_MIPS_74K, "MIPS 74K" },
  94};
  95
  96static const char *bcma_device_name(const struct bcma_device_id *id)
  97{
  98        const struct bcma_device_id_name *names;
  99        int size, i;
 100
 101        /* search manufacturer specific names */
 102        switch (id->manuf) {
 103        case BCMA_MANUF_ARM:
 104                names = bcma_arm_device_names;
 105                size = ARRAY_SIZE(bcma_arm_device_names);
 106                break;
 107        case BCMA_MANUF_BCM:
 108                names = bcma_bcm_device_names;
 109                size = ARRAY_SIZE(bcma_bcm_device_names);
 110                break;
 111        case BCMA_MANUF_MIPS:
 112                names = bcma_mips_device_names;
 113                size = ARRAY_SIZE(bcma_mips_device_names);
 114                break;
 115        default:
 116                return "UNKNOWN";
 117        }
 118
 119        for (i = 0; i < size; i++) {
 120                if (names[i].id == id->id)
 121                        return names[i].name;
 122        }
 123
 124        return "UNKNOWN";
 125}
 126
 127static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
 128                       u16 offset)
 129{
 130        return readl(bus->mmio + offset);
 131}
 132
 133static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
 134{
 135        if (bus->hosttype == BCMA_HOSTTYPE_PCI)
 136                pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
 137                                       addr);
 138}
 139
 140static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 **eromptr)
 141{
 142        u32 ent = readl(*eromptr);
 143        (*eromptr)++;
 144        return ent;
 145}
 146
 147static void bcma_erom_push_ent(u32 **eromptr)
 148{
 149        (*eromptr)--;
 150}
 151
 152static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 **eromptr)
 153{
 154        u32 ent = bcma_erom_get_ent(bus, eromptr);
 155        if (!(ent & SCAN_ER_VALID))
 156                return -ENOENT;
 157        if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
 158                return -ENOENT;
 159        return ent;
 160}
 161
 162static bool bcma_erom_is_end(struct bcma_bus *bus, u32 **eromptr)
 163{
 164        u32 ent = bcma_erom_get_ent(bus, eromptr);
 165        bcma_erom_push_ent(eromptr);
 166        return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
 167}
 168
 169static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 **eromptr)
 170{
 171        u32 ent = bcma_erom_get_ent(bus, eromptr);
 172        bcma_erom_push_ent(eromptr);
 173        return (((ent & SCAN_ER_VALID)) &&
 174                ((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
 175                ((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
 176}
 177
 178static void bcma_erom_skip_component(struct bcma_bus *bus, u32 **eromptr)
 179{
 180        u32 ent;
 181        while (1) {
 182                ent = bcma_erom_get_ent(bus, eromptr);
 183                if ((ent & SCAN_ER_VALID) &&
 184                    ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
 185                        break;
 186                if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
 187                        break;
 188        }
 189        bcma_erom_push_ent(eromptr);
 190}
 191
 192static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 **eromptr)
 193{
 194        u32 ent = bcma_erom_get_ent(bus, eromptr);
 195        if (!(ent & SCAN_ER_VALID))
 196                return -ENOENT;
 197        if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
 198                return -ENOENT;
 199        return ent;
 200}
 201
 202static s32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 **eromptr,
 203                                  u32 type, u8 port)
 204{
 205        u32 addrl, addrh, sizel, sizeh = 0;
 206        u32 size;
 207
 208        u32 ent = bcma_erom_get_ent(bus, eromptr);
 209        if ((!(ent & SCAN_ER_VALID)) ||
 210            ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
 211            ((ent & SCAN_ADDR_TYPE) != type) ||
 212            (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
 213                bcma_erom_push_ent(eromptr);
 214                return -EINVAL;
 215        }
 216
 217        addrl = ent & SCAN_ADDR_ADDR;
 218        if (ent & SCAN_ADDR_AG32)
 219                addrh = bcma_erom_get_ent(bus, eromptr);
 220        else
 221                addrh = 0;
 222
 223        if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
 224                size = bcma_erom_get_ent(bus, eromptr);
 225                sizel = size & SCAN_SIZE_SZ;
 226                if (size & SCAN_SIZE_SG32)
 227                        sizeh = bcma_erom_get_ent(bus, eromptr);
 228        } else
 229                sizel = SCAN_ADDR_SZ_BASE <<
 230                                ((ent & SCAN_ADDR_SZ) >> SCAN_ADDR_SZ_SHIFT);
 231
 232        return addrl;
 233}
 234
 235static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
 236                                                   u16 index)
 237{
 238        struct bcma_device *core;
 239
 240        list_for_each_entry(core, &bus->cores, list) {
 241                if (core->core_index == index)
 242                        return core;
 243        }
 244        return NULL;
 245}
 246
 247static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
 248{
 249        struct bcma_device *core;
 250
 251        list_for_each_entry_reverse(core, &bus->cores, list) {
 252                if (core->id.id == coreid)
 253                        return core;
 254        }
 255        return NULL;
 256}
 257
 258static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 259                              struct bcma_device_id *match, int core_num,
 260                              struct bcma_device *core)
 261{
 262        s32 tmp;
 263        u8 i, j;
 264        s32 cia, cib;
 265        u8 ports[2], wrappers[2];
 266
 267        /* get CIs */
 268        cia = bcma_erom_get_ci(bus, eromptr);
 269        if (cia < 0) {
 270                bcma_erom_push_ent(eromptr);
 271                if (bcma_erom_is_end(bus, eromptr))
 272                        return -ESPIPE;
 273                return -EILSEQ;
 274        }
 275        cib = bcma_erom_get_ci(bus, eromptr);
 276        if (cib < 0)
 277                return -EILSEQ;
 278
 279        /* parse CIs */
 280        core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 281        core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 282        core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 283        ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 284        ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 285        wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 286        wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 287        core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 288
 289        if (((core->id.manuf == BCMA_MANUF_ARM) &&
 290             (core->id.id == 0xFFF)) ||
 291            (ports[1] == 0)) {
 292                bcma_erom_skip_component(bus, eromptr);
 293                return -ENXIO;
 294        }
 295
 296        /* check if component is a core at all */
 297        if (wrappers[0] + wrappers[1] == 0) {
 298                /* Some specific cores don't need wrappers */
 299                switch (core->id.id) {
 300                case BCMA_CORE_4706_MAC_GBIT_COMMON:
 301                /* Not used yet: case BCMA_CORE_OOB_ROUTER: */
 302                        break;
 303                default:
 304                        bcma_erom_skip_component(bus, eromptr);
 305                        return -ENXIO;
 306                }
 307        }
 308
 309        if (bcma_erom_is_bridge(bus, eromptr)) {
 310                bcma_erom_skip_component(bus, eromptr);
 311                return -ENXIO;
 312        }
 313
 314        if (bcma_find_core_by_index(bus, core_num)) {
 315                bcma_erom_skip_component(bus, eromptr);
 316                return -ENODEV;
 317        }
 318
 319        if (match && ((match->manuf != BCMA_ANY_MANUF &&
 320              match->manuf != core->id.manuf) ||
 321             (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
 322             (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
 323             (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
 324            )) {
 325                bcma_erom_skip_component(bus, eromptr);
 326                return -ENODEV;
 327        }
 328
 329        /* get & parse master ports */
 330        for (i = 0; i < ports[0]; i++) {
 331                s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
 332                if (mst_port_d < 0)
 333                        return -EILSEQ;
 334        }
 335
 336        /* First Slave Address Descriptor should be port 0:
 337         * the main register space for the core
 338         */
 339        tmp = bcma_erom_get_addr_desc(bus, eromptr, SCAN_ADDR_TYPE_SLAVE, 0);
 340        if (tmp <= 0) {
 341                /* Try again to see if it is a bridge */
 342                tmp = bcma_erom_get_addr_desc(bus, eromptr,
 343                                              SCAN_ADDR_TYPE_BRIDGE, 0);
 344                if (tmp <= 0) {
 345                        return -EILSEQ;
 346                } else {
 347                        bcma_info(bus, "Bridge found\n");
 348                        return -ENXIO;
 349                }
 350        }
 351        core->addr = tmp;
 352
 353        /* get & parse slave ports */
 354        for (i = 0; i < ports[1]; i++) {
 355                for (j = 0; ; j++) {
 356                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 357                                SCAN_ADDR_TYPE_SLAVE, i);
 358                        if (tmp < 0) {
 359                                /* no more entries for port _i_ */
 360                                /* pr_debug("erom: slave port %d "
 361                                 * "has %d descriptors\n", i, j); */
 362                                break;
 363                        } else {
 364                                if (i == 0 && j == 0)
 365                                        core->addr1 = tmp;
 366                        }
 367                }
 368        }
 369
 370        /* get & parse master wrappers */
 371        for (i = 0; i < wrappers[0]; i++) {
 372                for (j = 0; ; j++) {
 373                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 374                                SCAN_ADDR_TYPE_MWRAP, i);
 375                        if (tmp < 0) {
 376                                /* no more entries for port _i_ */
 377                                /* pr_debug("erom: master wrapper %d "
 378                                 * "has %d descriptors\n", i, j); */
 379                                break;
 380                        } else {
 381                                if (i == 0 && j == 0)
 382                                        core->wrap = tmp;
 383                        }
 384                }
 385        }
 386
 387        /* get & parse slave wrappers */
 388        for (i = 0; i < wrappers[1]; i++) {
 389                u8 hack = (ports[1] == 1) ? 0 : 1;
 390                for (j = 0; ; j++) {
 391                        tmp = bcma_erom_get_addr_desc(bus, eromptr,
 392                                SCAN_ADDR_TYPE_SWRAP, i + hack);
 393                        if (tmp < 0) {
 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 (wrappers[0] == 0 && !i && !j)
 400                                        core->wrap = tmp;
 401                        }
 402                }
 403        }
 404        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 405                core->io_addr = ioremap_nocache(core->addr, BCMA_CORE_SIZE);
 406                if (!core->io_addr)
 407                        return -ENOMEM;
 408                core->io_wrap = ioremap_nocache(core->wrap, BCMA_CORE_SIZE);
 409                if (!core->io_wrap) {
 410                        iounmap(core->io_addr);
 411                        return -ENOMEM;
 412                }
 413        }
 414        return 0;
 415}
 416
 417void bcma_init_bus(struct bcma_bus *bus)
 418{
 419        s32 tmp;
 420        struct bcma_chipinfo *chipinfo = &(bus->chipinfo);
 421
 422        if (bus->init_done)
 423                return;
 424
 425        INIT_LIST_HEAD(&bus->cores);
 426        bus->nr_cores = 0;
 427
 428        bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
 429
 430        tmp = bcma_scan_read32(bus, 0, BCMA_CC_ID);
 431        chipinfo->id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
 432        chipinfo->rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
 433        chipinfo->pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
 434        bcma_info(bus, "Found chip with id 0x%04X, rev 0x%02X and package 0x%02X\n",
 435                  chipinfo->id, chipinfo->rev, chipinfo->pkg);
 436
 437        bus->init_done = true;
 438}
 439
 440int bcma_bus_scan(struct bcma_bus *bus)
 441{
 442        u32 erombase;
 443        u32 __iomem *eromptr, *eromend;
 444
 445        int err, core_num = 0;
 446
 447        bcma_init_bus(bus);
 448
 449        erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 450        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 451                eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 452                if (!eromptr)
 453                        return -ENOMEM;
 454        } else {
 455                eromptr = bus->mmio;
 456        }
 457
 458        eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 459
 460        bcma_scan_switch_core(bus, erombase);
 461
 462        while (eromptr < eromend) {
 463                struct bcma_device *other_core;
 464                struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
 465                if (!core) {
 466                        err = -ENOMEM;
 467                        goto out;
 468                }
 469                INIT_LIST_HEAD(&core->list);
 470                core->bus = bus;
 471
 472                err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
 473                if (err < 0) {
 474                        kfree(core);
 475                        if (err == -ENODEV) {
 476                                core_num++;
 477                                continue;
 478                        } else if (err == -ENXIO) {
 479                                continue;
 480                        } else if (err == -ESPIPE) {
 481                                break;
 482                        }
 483                        goto out;
 484                }
 485
 486                core->core_index = core_num++;
 487                bus->nr_cores++;
 488                other_core = bcma_find_core_reverse(bus, core->id.id);
 489                core->core_unit = (other_core == NULL) ? 0 : other_core->core_unit + 1;
 490
 491                bcma_info(bus, "Core %d found: %s (manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 492                          core->core_index, bcma_device_name(&core->id),
 493                          core->id.manuf, core->id.id, core->id.rev,
 494                          core->id.class);
 495
 496                list_add_tail(&core->list, &bus->cores);
 497        }
 498
 499        err = 0;
 500out:
 501        if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 502                iounmap(eromptr);
 503
 504        return err;
 505}
 506
 507int __init bcma_bus_scan_early(struct bcma_bus *bus,
 508                               struct bcma_device_id *match,
 509                               struct bcma_device *core)
 510{
 511        u32 erombase;
 512        u32 __iomem *eromptr, *eromend;
 513
 514        int err = -ENODEV;
 515        int core_num = 0;
 516
 517        erombase = bcma_scan_read32(bus, 0, BCMA_CC_EROM);
 518        if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 519                eromptr = ioremap_nocache(erombase, BCMA_CORE_SIZE);
 520                if (!eromptr)
 521                        return -ENOMEM;
 522        } else {
 523                eromptr = bus->mmio;
 524        }
 525
 526        eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 527
 528        bcma_scan_switch_core(bus, erombase);
 529
 530        while (eromptr < eromend) {
 531                memset(core, 0, sizeof(*core));
 532                INIT_LIST_HEAD(&core->list);
 533                core->bus = bus;
 534
 535                err = bcma_get_next_core(bus, &eromptr, match, core_num, core);
 536                if (err == -ENODEV) {
 537                        core_num++;
 538                        continue;
 539                } else if (err == -ENXIO)
 540                        continue;
 541                else if (err == -ESPIPE)
 542                        break;
 543                else if (err < 0)
 544                        goto out;
 545
 546                core->core_index = core_num++;
 547                bus->nr_cores++;
 548                bcma_info(bus, "Core %d found: %s (manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 549                          core->core_index, bcma_device_name(&core->id),
 550                          core->id.manuf, core->id.id, core->id.rev,
 551                          core->id.class);
 552
 553                list_add_tail(&core->list, &bus->cores);
 554                err = 0;
 555                break;
 556        }
 557
 558out:
 559        if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 560                iounmap(eromptr);
 561
 562        return err;
 563}
 564
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