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 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
 353 void 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
 372 int 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
 433 int __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 }