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_DEFAULT, "Default" },
 102 };
 103
 104 static const struct bcma_device_id_name bcma_mips_device_names[] = {
 105         { BCMA_CORE_MIPS, "MIPS" },
 106         { BCMA_CORE_MIPS_3302, "MIPS 3302" },
 107         { BCMA_CORE_MIPS_74K, "MIPS 74K" },
 108 };
 109
 110 static const char *bcma_device_name(const struct bcma_device_id *id)
 111 {
 112         const struct bcma_device_id_name *names;
 113         int size, i;
 114
 115         /* search manufacturer specific names */
 116         switch (id->manuf) {
 117         case BCMA_MANUF_ARM:
 118                 names = bcma_arm_device_names;
 119                 size = ARRAY_SIZE(bcma_arm_device_names);
 120                 break;
 121         case BCMA_MANUF_BCM:
 122                 names = bcma_bcm_device_names;
 123                 size = ARRAY_SIZE(bcma_bcm_device_names);
 124                 break;
 125         case BCMA_MANUF_MIPS:
 126                 names = bcma_mips_device_names;
 127                 size = ARRAY_SIZE(bcma_mips_device_names);
 128                 break;
 129         default:
 130                 return "UNKNOWN";
 131         }
 132
 133         for (i = 0; i < size; i++) {
 134                 if (names[i].id == id->id)
 135                         return names[i].name;
 136         }
 137
 138         return "UNKNOWN";
 139 }
 140
 141 static u32 bcma_scan_read32(struct bcma_bus *bus, u8 current_coreidx,
 142                        u16 offset)
 143 {
 144         return readl(bus->mmio + offset);
 145 }
 146
 147 static void bcma_scan_switch_core(struct bcma_bus *bus, u32 addr)
 148 {
 149         if (bus->hosttype == BCMA_HOSTTYPE_PCI)
 150                 pci_write_config_dword(bus->host_pci, BCMA_PCI_BAR0_WIN,
 151                                        addr);
 152 }
 153
 154 static u32 bcma_erom_get_ent(struct bcma_bus *bus, u32 __iomem **eromptr)
 155 {
 156         u32 ent = readl(*eromptr);
 157         (*eromptr)++;
 158         return ent;
 159 }
 160
 161 static void bcma_erom_push_ent(u32 __iomem **eromptr)
 162 {
 163         (*eromptr)--;
 164 }
 165
 166 static s32 bcma_erom_get_ci(struct bcma_bus *bus, u32 __iomem **eromptr)
 167 {
 168         u32 ent = bcma_erom_get_ent(bus, eromptr);
 169         if (!(ent & SCAN_ER_VALID))
 170                 return -ENOENT;
 171         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_CI)
 172                 return -ENOENT;
 173         return ent;
 174 }
 175
 176 static bool bcma_erom_is_end(struct bcma_bus *bus, u32 __iomem **eromptr)
 177 {
 178         u32 ent = bcma_erom_get_ent(bus, eromptr);
 179         bcma_erom_push_ent(eromptr);
 180         return (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID));
 181 }
 182
 183 static bool bcma_erom_is_bridge(struct bcma_bus *bus, u32 __iomem **eromptr)
 184 {
 185         u32 ent = bcma_erom_get_ent(bus, eromptr);
 186         bcma_erom_push_ent(eromptr);
 187         return (((ent & SCAN_ER_VALID)) &&
 188                 ((ent & SCAN_ER_TAGX) == SCAN_ER_TAG_ADDR) &&
 189                 ((ent & SCAN_ADDR_TYPE) == SCAN_ADDR_TYPE_BRIDGE));
 190 }
 191
 192 static void bcma_erom_skip_component(struct bcma_bus *bus, u32 __iomem **eromptr)
 193 {
 194         u32 ent;
 195         while (1) {
 196                 ent = bcma_erom_get_ent(bus, eromptr);
 197                 if ((ent & SCAN_ER_VALID) &&
 198                     ((ent & SCAN_ER_TAG) == SCAN_ER_TAG_CI))
 199                         break;
 200                 if (ent == (SCAN_ER_TAG_END | SCAN_ER_VALID))
 201                         break;
 202         }
 203         bcma_erom_push_ent(eromptr);
 204 }
 205
 206 static s32 bcma_erom_get_mst_port(struct bcma_bus *bus, u32 __iomem **eromptr)
 207 {
 208         u32 ent = bcma_erom_get_ent(bus, eromptr);
 209         if (!(ent & SCAN_ER_VALID))
 210                 return -ENOENT;
 211         if ((ent & SCAN_ER_TAG) != SCAN_ER_TAG_MP)
 212                 return -ENOENT;
 213         return ent;
 214 }
 215
 216 static u32 bcma_erom_get_addr_desc(struct bcma_bus *bus, u32 __iomem **eromptr,
 217                                   u32 type, u8 port)
 218 {
 219         u32 addrl, addrh, sizel, sizeh = 0;
 220         u32 size;
 221
 222         u32 ent = bcma_erom_get_ent(bus, eromptr);
 223         if ((!(ent & SCAN_ER_VALID)) ||
 224             ((ent & SCAN_ER_TAGX) != SCAN_ER_TAG_ADDR) ||
 225             ((ent & SCAN_ADDR_TYPE) != type) ||
 226             (((ent & SCAN_ADDR_PORT) >> SCAN_ADDR_PORT_SHIFT) != port)) {
 227                 bcma_erom_push_ent(eromptr);
 228                 return (u32)-EINVAL;
 229         }
 230
 231         addrl = ent & SCAN_ADDR_ADDR;
 232         if (ent & SCAN_ADDR_AG32)
 233                 addrh = bcma_erom_get_ent(bus, eromptr);
 234         else
 235                 addrh = 0;
 236
 237         if ((ent & SCAN_ADDR_SZ) == SCAN_ADDR_SZ_SZD) {
 238                 size = bcma_erom_get_ent(bus, eromptr);
 239                 sizel = size & SCAN_SIZE_SZ;
 240                 if (size & SCAN_SIZE_SG32)
 241                         sizeh = bcma_erom_get_ent(bus, eromptr);
 242         } else
 243                 sizel = SCAN_ADDR_SZ_BASE <<
 244                                 ((ent & SCAN_ADDR_SZ) >> SCAN_ADDR_SZ_SHIFT);
 245
 246         return addrl;
 247 }
 248
 249 static struct bcma_device *bcma_find_core_by_index(struct bcma_bus *bus,
 250                                                    u16 index)
 251 {
 252         struct bcma_device *core;
 253
 254         list_for_each_entry(core, &bus->cores, list) {
 255                 if (core->core_index == index)
 256                         return core;
 257         }
 258         return NULL;
 259 }
 260
 261 static struct bcma_device *bcma_find_core_reverse(struct bcma_bus *bus, u16 coreid)
 262 {
 263         struct bcma_device *core;
 264
 265         list_for_each_entry_reverse(core, &bus->cores, list) {
 266                 if (core->id.id == coreid)
 267                         return core;
 268         }
 269         return NULL;
 270 }
 271
 272 #define IS_ERR_VALUE_U32(x) ((x) >= (u32)-MAX_ERRNO)
 273
 274 static int bcma_get_next_core(struct bcma_bus *bus, u32 __iomem **eromptr,
 275                               struct bcma_device_id *match, int core_num,
 276                               struct bcma_device *core)
 277 {
 278         u32 tmp;
 279         u8 i, j, k;
 280         s32 cia, cib;
 281         u8 ports[2], wrappers[2];
 282
 283         /* get CIs */
 284         cia = bcma_erom_get_ci(bus, eromptr);
 285         if (cia < 0) {
 286                 bcma_erom_push_ent(eromptr);
 287                 if (bcma_erom_is_end(bus, eromptr))
 288                         return -ESPIPE;
 289                 return -EILSEQ;
 290         }
 291         cib = bcma_erom_get_ci(bus, eromptr);
 292         if (cib < 0)
 293                 return -EILSEQ;
 294
 295         /* parse CIs */
 296         core->id.class = (cia & SCAN_CIA_CLASS) >> SCAN_CIA_CLASS_SHIFT;
 297         core->id.id = (cia & SCAN_CIA_ID) >> SCAN_CIA_ID_SHIFT;
 298         core->id.manuf = (cia & SCAN_CIA_MANUF) >> SCAN_CIA_MANUF_SHIFT;
 299         ports[0] = (cib & SCAN_CIB_NMP) >> SCAN_CIB_NMP_SHIFT;
 300         ports[1] = (cib & SCAN_CIB_NSP) >> SCAN_CIB_NSP_SHIFT;
 301         wrappers[0] = (cib & SCAN_CIB_NMW) >> SCAN_CIB_NMW_SHIFT;
 302         wrappers[1] = (cib & SCAN_CIB_NSW) >> SCAN_CIB_NSW_SHIFT;
 303         core->id.rev = (cib & SCAN_CIB_REV) >> SCAN_CIB_REV_SHIFT;
 304
 305         if (((core->id.manuf == BCMA_MANUF_ARM) &&
 306              (core->id.id == 0xFFF)) ||
 307             (ports[1] == 0)) {
 308                 bcma_erom_skip_component(bus, eromptr);
 309                 return -ENXIO;
 310         }
 311
 312         /* check if component is a core at all */
 313         if (wrappers[0] + wrappers[1] == 0) {
 314                 /* Some specific cores don't need wrappers */
 315                 switch (core->id.id) {
 316                 case BCMA_CORE_4706_MAC_GBIT_COMMON:
 317                 case BCMA_CORE_NS_CHIPCOMMON_B:
 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_nocache(core->addr, BCMA_CORE_SIZE);
 424                 if (!core->io_addr)
 425                         return -ENOMEM;
 426                 if (core->wrap) {
 427                         core->io_wrap = ioremap_nocache(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
 438 void 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
 457 int 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_nocache(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;
 520 out:
 521         if (bus->hosttype == BCMA_HOSTTYPE_SOC)
 522                 iounmap(eromptr);
 523
 524         return err;
 525 }