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
  23 static 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
  30 static 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
 107 static 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
 113 static 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
 144 static u32 bcma_scan_read32(struct bcma_bus *bus, u16 offset)
 145 {
 146         return readl(bus->mmio + offset);
 147 }
 148
 149 static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
 150 {
 151         if (bus->hosttype == BCMA_HOSTTYPE_PCI)
 152                 pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
 153                                        addr);
 154 }
 155
 156 static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 __iomem **eromptr)
 157 {
 158         u32 ent = readl(*eromptr);
 159         (*eromptr)++;
 160         return ent;
 161 }
 162
 163 static void bcma_erom_push_ent(u32 __iomem **eromptr)
 164 {
 165         (*eromptr)--;
 166 }
 167
 168 static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 __iomem **eromptr)
 169 {
 170         u32 ent = bcma_erom_get_ent(bus, eromptr);
 171         if (!(ent & SCAN_ER_VALID))
 172                 return -ENOENT;
 173         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
 174                 return -ENOENT;
 175         return ent;
 176 }
 177
 178 static bool bcma_erom_is_end(struct bcma_bus *bus, u32 __iomem **eromptr)
 179 {
 180         u32 ent = bcma_erom_get_ent(bus, eromptr);
 181         bcma_erom_push_ent(eromptr);
 182         return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
 183 }
 184
 185 static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 __iomem **eromptr)
 186 {
 187         u32 ent = bcma_erom_get_ent(bus, eromptr);
 188         bcma_erom_push_ent(eromptr);
 189         return (((ent & SCAN_ER_VALID)) &&
 190                 ((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
 191                 ((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
 192 }
 193
 194 static void bcma_erom_skip_component(struct bcma_bus *bus, u32 __iomem **eromptr)
 195 {
 196         u32 ent;
 197         while (1) {
 198                 ent = bcma_erom_get_ent(bus, eromptr);
 199                 if ((ent & SCAN_ER_VALID) &&
 200                     ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
 201                         break;
 202                 if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
 203                         break;
 204         }
 205         bcma_erom_push_ent(eromptr);
 206 }
 207
 208 static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 __iomem **eromptr)
 209 {
 210         u32 ent = bcma_erom_get_ent(bus, eromptr);
 211         if (!(ent & SCAN_ER_VALID))
 212                 return -ENOENT;
 213         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
 214                 return -ENOENT;
 215         return ent;
 216 }
 217
 218 static u32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 __iomem **eromptr,
 219                                   u32 type, u8 port)
 220 {
 221         u32 addrl;
 222         u32 size;
 223
 224         u32 ent = bcma_erom_get_ent(bus, eromptr);
 225         if ((!(ent & SCAN_ER_VALID)) ||
 226             ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
 227             ((ent & SCAN_ADDR_TYPE) != type) ||
 228             (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
 229                 bcma_erom_push_ent(eromptr);
 230                 return (u32)-EINVAL;
 231         }
 232
 233         addrl = ent & SCAN_ADDR_ADDR;
 234         if (ent & SCAN_ADDR_AG32)
 235                 bcma_erom_get_ent(bus, eromptr);
 236
 237         if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
 238                 size = bcma_erom_get_ent(bus, eromptr);
 239                 if (size & SCAN_SIZE_SG32)
 240                         bcma_erom_get_ent(bus, eromptr);
 241         }
 242
 243         return addrl;
 244 }
 245
 246 static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
 247                                                    u16 index)
 248 {
 249         struct bcma_device *core;
 250
 251         list_for_each_entry(core, &bus->cores, list) {
 252                 if (core->core_index == index)
 253                         return core;
 254         }
 255         return NULL;
 256 }
 257
 258 static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
 259 {
 260         struct bcma_device *core;
 261
 262         list_for_each_entry_reverse(core, &bus->cores, list) {
 263                 if (core->id.id == coreid)
 264                         return core;
 265         }
 266         return NULL;
 267 }
 268
 269 #define IS_ERR_VALUE_U32(x) ((x) >= (u32)-MAX_ERRNO)
 270
 271 static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 272                               struct bcma_device_id *match, int core_num,
 273                               struct bcma_device *core)
 274 {
 275         u32 tmp;
 276         u8 i, j, k;
 277         s32 cia, cib;
 278         u8 ports[2], wrappers[2];
 279
 280         /* get CIs */
 281         cia = bcma_erom_get_ci(bus, eromptr);
 282         if (cia < 0) {
 283                 bcma_erom_push_ent(eromptr);
 284                 if (bcma_erom_is_end(bus, eromptr))
 285                         return -ESPIPE;
 286                 return -EILSEQ;
 287         }
 288         cib = bcma_erom_get_ci(bus, eromptr);
 289         if (cib < 0)
 290                 return -EILSEQ;
 291
 292         /* parse CIs */
 293         core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 294         core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 295         core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 296         ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 297         ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 298         wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 299         wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 300         core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 301
 302         if (((core->id.manuf == BCMA_MANUF_ARM) &&
 303              (core->id.id == 0xFFF)) ||
 304             (ports[1] == 0)) {
 305                 bcma_erom_skip_component(bus, eromptr);
 306                 return -ENXIO;
 307         }
 308
 309         /* check if component is a core at all */
 310         if (wrappers[0] + wrappers[1] == 0) {
 311                 /* Some specific cores don't need wrappers */
 312                 switch (core->id.id) {
 313                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 314                 case BCMA_CORE_NS_CHIPCOMMON_B:
 315                 case BCMA_CORE_PMU:
 316                 case BCMA_CORE_GCI:
 317                 /* Not used yet: case BCMA_CORE_OOB_ROUTER: */
 318                         break;
 319                 default:
 320                         bcma_erom_skip_component(bus, eromptr);
 321                         return -ENXIO;
 322                 }
 323         }
 324
 325         if (bcma_erom_is_bridge(bus, eromptr)) {
 326                 bcma_erom_skip_component(bus, eromptr);
 327                 return -ENXIO;
 328         }
 329
 330         if (bcma_find_core_by_index(bus, core_num)) {
 331                 bcma_erom_skip_component(bus, eromptr);
 332                 return -ENODEV;
 333         }
 334
 335         if (match && ((match->manuf != BCMA_ANY_MANUF &&
 336               match->manuf != core->id.manuf) ||
 337              (match->id != BCMA_ANY_ID && match->id != core->id.id) ||
 338              (match->rev != BCMA_ANY_REV && match->rev != core->id.rev) ||
 339              (match->class != BCMA_ANY_CLASS && match->class != core->id.class)
 340             )) {
 341                 bcma_erom_skip_component(bus, eromptr);
 342                 return -ENODEV;
 343         }
 344
 345         /* get & parse master ports */
 346         for (i = 0; i < ports[0]; i++) {
 347                 s32 mst_port_d = bcma_erom_get_mst_port(bus, eromptr);
 348                 if (mst_port_d < 0)
 349                         return -EILSEQ;
 350         }
 351
 352         /* First Slave Address Descriptor should be port 0:
 353          * the main register space for the core
 354          */
 355         tmp = bcma_erom_get_addr_desc(bus, eromptr, SCAN_ADDR_TYPE_SLAVE, 0);
 356         if (tmp == 0 || IS_ERR_VALUE_U32(tmp)) {
 357                 /* Try again to see if it is a bridge */
 358                 tmp = bcma_erom_get_addr_desc(bus, eromptr,
 359                                               SCAN_ADDR_TYPE_BRIDGE, 0);
 360                 if (tmp == 0 || IS_ERR_VALUE_U32(tmp)) {
 361                         return -EILSEQ;
 362                 } else {
 363                         bcma_info(bus, "Bridge found\n");
 364                         return -ENXIO;
 365                 }
 366         }
 367         core->addr = tmp;
 368
 369         /* get & parse slave ports */
 370         k = 0;
 371         for (i = 0; i < ports[1]; i++) {
 372                 for (j = 0; ; j++) {
 373                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 374                                 SCAN_ADDR_TYPE_SLAVE, i);
 375                         if (IS_ERR_VALUE_U32(tmp)) {
 376                                 /* no more entries for port _i_ */
 377                                 /* pr_debug("erom: slave port %d "
 378                                  * "has %d descriptors\n", i, j); */
 379                                 break;
 380                         } else if (k < ARRAY_SIZE(core->addr_s)) {
 381                                 core->addr_s[k] = tmp;
 382                                 k++;
 383                         }
 384                 }
 385         }
 386
 387         /* get & parse master wrappers */
 388         for (i = 0; i < wrappers[0]; i++) {
 389                 for (j = 0; ; j++) {
 390                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 391                                 SCAN_ADDR_TYPE_MWRAP, i);
 392                         if (IS_ERR_VALUE_U32(tmp)) {
 393                                 /* no more entries for port _i_ */
 394                                 /* pr_debug("erom: master wrapper %d "
 395                                  * "has %d descriptors\n", i, j); */
 396                                 break;
 397                         } else {
 398                                 if (i == 0 && j == 0)
 399                                         core->wrap = tmp;
 400                         }
 401                 }
 402         }
 403
 404         /* get & parse slave wrappers */
 405         for (i = 0; i < wrappers[1]; i++) {
 406                 u8 hack = (ports[1] == 1) ? 0 : 1;
 407                 for (j = 0; ; j++) {
 408                         tmp = bcma_erom_get_addr_desc(bus, eromptr,
 409                                 SCAN_ADDR_TYPE_SWRAP, i + hack);
 410                         if (IS_ERR_VALUE_U32(tmp)) {
 411                                 /* no more entries for port _i_ */
 412                                 /* pr_debug("erom: master wrapper %d "
 413                                  * has %d descriptors\n", i, j); */
 414                                 break;
 415                         } else {
 416                                 if (wrappers[0] == 0 && !i && !j)
 417                                         core->wrap = tmp;
 418                         }
 419                 }
 420         }
 421         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 422                 core->io_addr = ioremap(core->addr, BCMA_CORE_SIZE);
 423                 if (!core->io_addr)
 424                         return -ENOMEM;
 425                 if (core->wrap) {
 426                         core->io_wrap = ioremap(core->wrap,
 427                                                         BCMA_CORE_SIZE);
 428                         if (!core->io_wrap) {
 429                                 iounmap(core->io_addr);
 430                                 return -ENOMEM;
 431                         }
 432                 }
 433         }
 434         return 0;
 435 }
 436
 437 void bcma_detect_chip(struct bcma_bus *bus)
 438 {
 439         s32 tmp;
 440         struct bcma_chipinfo *chipinfo = &(bus->chipinfo);
 441         char chip_id[8];
 442
 443         bcma_scan_switch_core(bus, BCMA_ADDR_BASE);
 444
 445         tmp = bcma_scan_read32(bus, BCMA_CC_ID);
 446         chipinfo->id = (tmp & BCMA_CC_ID_ID) >> BCMA_CC_ID_ID_SHIFT;
 447         chipinfo->rev = (tmp & BCMA_CC_ID_REV) >> BCMA_CC_ID_REV_SHIFT;
 448         chipinfo->pkg = (tmp & BCMA_CC_ID_PKG) >> BCMA_CC_ID_PKG_SHIFT;
 449
 450         snprintf(chip_id, ARRAY_SIZE(chip_id),
 451                  (chipinfo->id > 0x9999) ? "%d" : "0x%04X", chipinfo->id);
 452         bcma_info(bus, "Found chip with id %s, rev 0x%02X and package 0x%02X\n",
 453                   chip_id, chipinfo->rev, chipinfo->pkg);
 454 }
 455
 456 int bcma_bus_scan(struct bcma_bus *bus)
 457 {
 458         u32 erombase;
 459         u32 __iomem *eromptr, *eromend;
 460
 461         int err, core_num = 0;
 462
 463         /* Skip if bus was already scanned (e.g. during early register) */
 464         if (bus->nr_cores)
 465                 return 0;
 466
 467         erombase = bcma_scan_read32(bus, BCMA_CC_EROM);
 468         if (bus->hosttype == BCMA_HOSTTYPE_SOC) {
 469                 eromptr = ioremap(erombase, BCMA_CORE_SIZE);
 470                 if (!eromptr)
 471                         return -ENOMEM;
 472         } else {
 473                 eromptr = bus->mmio;
 474         }
 475
 476         eromend = eromptr + BCMA_CORE_SIZE / sizeof(u32);
 477
 478         bcma_scan_switch_core(bus, erombase);
 479
 480         while (eromptr < eromend) {
 481                 struct bcma_device *other_core;
 482                 struct bcma_device *core = kzalloc(sizeof(*core), GFP_KERNEL);
 483                 if (!core) {
 484                         err = -ENOMEM;
 485                         goto out;
 486                 }
 487                 INIT_LIST_HEAD(&core->list);
 488                 core->bus = bus;
 489
 490                 err = bcma_get_next_core(bus, &eromptr, NULL, core_num, core);
 491                 if (err < 0) {
 492                         kfree(core);
 493                         if (err == -ENODEV) {
 494                                 core_num++;
 495                                 continue;
 496                         } else if (err == -ENXIO) {
 497                                 continue;
 498                         } else if (err == -ESPIPE) {
 499                                 break;
 500                         }
 501                         goto out;
 502                 }
 503
 504                 core->core_index = core_num++;
 505                 bus->nr_cores++;
 506                 other_core = bcma_find_core_reverse(bus, core->id.id);
 507                 core->core_unit = (other_core == NULL) ? 0 : other_core->core_unit + 1;
 508                 bcma_prepare_core(bus, core);
 509
 510                 bcma_info(bus, "Core %d found: %s (manuf 0x%03X, id 0x%03X, rev 0x%02X, class 0x%X)\n",
 511                           core->core_index, bcma_device_name(&core->id),
 512                           core->id.manuf, core->id.id, core->id.rev,
 513                           core->id.class);
 514
 515                 list_add_tail(&core->list, &bus->cores);
 516         }
 517
 518         err = 0;
 519 out:
 520         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 521                 iounmap(eromptr);
 522
 523         return err;
 524 }