Pileus Git - ~andy/linux/blob - arch/arm/mach-omap2/id.c

   1 /*
   2  * linux/arch/arm/mach-omap2/id.c
   3  *
   4  * OMAP2 CPU identification code
   5  *
   6  * Copyright (C) 2005 Nokia Corporation
   7  * Written by Tony Lindgren <tony@atomide.com>
   8  *
   9  * Copyright (C) 2009-11 Texas Instruments
  10  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/io.h>
  21 #include <linux/slab.h>
  22
  23 #ifdef CONFIG_SOC_BUS
  24 #include <linux/sys_soc.h>
  25 #endif
  26
  27 #include <asm/cputype.h>
  28
  29 #include "common.h"
  30
  31 #include "id.h"
  32
  33 #include "soc.h"
  34 #include "control.h"
  35
  36 #define OMAP4_SILICON_TYPE_STANDARD             0x01
  37 #define OMAP4_SILICON_TYPE_PERFORMANCE          0x02
  38
  39 #define OMAP_SOC_MAX_NAME_LENGTH                16
  40
  41 static unsigned int omap_revision;
  42 static char soc_name[OMAP_SOC_MAX_NAME_LENGTH];
  43 static char soc_rev[OMAP_SOC_MAX_NAME_LENGTH];
  44 u32 omap_features;
  45
  46 unsigned int omap_rev(void)
  47 {
  48         return omap_revision;
  49 }
  50 EXPORT_SYMBOL(omap_rev);
  51
  52 int omap_type(void)
  53 {
  54         u32 val = 0;
  55
  56         if (cpu_is_omap24xx()) {
  57                 val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);
  58         } else if (soc_is_am33xx()) {
  59                 val = omap_ctrl_readl(AM33XX_CONTROL_STATUS);
  60         } else if (cpu_is_omap34xx()) {
  61                 val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
  62         } else if (cpu_is_omap44xx()) {
  63                 val = omap_ctrl_readl(OMAP4_CTRL_MODULE_CORE_STATUS);
  64         } else if (soc_is_omap54xx()) {
  65                 val = omap_ctrl_readl(OMAP5XXX_CONTROL_STATUS);
  66                 val &= OMAP5_DEVICETYPE_MASK;
  67                 val >>= 6;
  68                 goto out;
  69         } else {
  70                 pr_err("Cannot detect omap type!\n");
  71                 goto out;
  72         }
  73
  74         val &= OMAP2_DEVICETYPE_MASK;
  75         val >>= 8;
  76
  77 out:
  78         return val;
  79 }
  80 EXPORT_SYMBOL(omap_type);
  81
  82
  83 /*----------------------------------------------------------------------------*/
  84
  85 #define OMAP_TAP_IDCODE         0x0204
  86 #define OMAP_TAP_DIE_ID_0       0x0218
  87 #define OMAP_TAP_DIE_ID_1       0x021C
  88 #define OMAP_TAP_DIE_ID_2       0x0220
  89 #define OMAP_TAP_DIE_ID_3       0x0224
  90
  91 #define OMAP_TAP_DIE_ID_44XX_0  0x0200
  92 #define OMAP_TAP_DIE_ID_44XX_1  0x0208
  93 #define OMAP_TAP_DIE_ID_44XX_2  0x020c
  94 #define OMAP_TAP_DIE_ID_44XX_3  0x0210
  95
  96 #define read_tap_reg(reg)       __raw_readl(tap_base  + (reg))
  97
  98 struct omap_id {
  99         u16     hawkeye;        /* Silicon type (Hawkeye id) */
 100         u8      dev;            /* Device type from production_id reg */
 101         u32     type;           /* Combined type id copied to omap_revision */
 102 };
 103
 104 /* Register values to detect the OMAP version */
 105 static struct omap_id omap_ids[] __initdata = {
 106         { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200024 },
 107         { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201024 },
 108         { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202024 },
 109         { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220024 },
 110         { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230024 },
 111         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300024 },
 112 };
 113
 114 static void __iomem *tap_base;
 115 static u16 tap_prod_id;
 116
 117 void omap_get_die_id(struct omap_die_id *odi)
 118 {
 119         if (cpu_is_omap44xx() || soc_is_omap54xx()) {
 120                 odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_0);
 121                 odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_1);
 122                 odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_2);
 123                 odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_3);
 124
 125                 return;
 126         }
 127         odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_0);
 128         odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_1);
 129         odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_2);
 130         odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_3);
 131 }
 132
 133 void __init omap2xxx_check_revision(void)
 134 {
 135         int i, j;
 136         u32 idcode, prod_id;
 137         u16 hawkeye;
 138         u8  dev_type, rev;
 139         struct omap_die_id odi;
 140
 141         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 142         prod_id = read_tap_reg(tap_prod_id);
 143         hawkeye = (idcode >> 12) & 0xffff;
 144         rev = (idcode >> 28) & 0x0f;
 145         dev_type = (prod_id >> 16) & 0x0f;
 146         omap_get_die_id(&odi);
 147
 148         pr_debug("OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
 149                  idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
 150         pr_debug("OMAP_TAP_DIE_ID_0: 0x%08x\n", odi.id_0);
 151         pr_debug("OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
 152                  odi.id_1, (odi.id_1 >> 28) & 0xf);
 153         pr_debug("OMAP_TAP_DIE_ID_2: 0x%08x\n", odi.id_2);
 154         pr_debug("OMAP_TAP_DIE_ID_3: 0x%08x\n", odi.id_3);
 155         pr_debug("OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
 156                  prod_id, dev_type);
 157
 158         /* Check hawkeye ids */
 159         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 160                 if (hawkeye == omap_ids[i].hawkeye)
 161                         break;
 162         }
 163
 164         if (i == ARRAY_SIZE(omap_ids)) {
 165                 printk(KERN_ERR "Unknown OMAP CPU id\n");
 166                 return;
 167         }
 168
 169         for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
 170                 if (dev_type == omap_ids[j].dev)
 171                         break;
 172         }
 173
 174         if (j == ARRAY_SIZE(omap_ids)) {
 175                 pr_err("Unknown OMAP device type. Handling it as OMAP%04x\n",
 176                        omap_ids[i].type >> 16);
 177                 j = i;
 178         }
 179
 180         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 181         sprintf(soc_rev, "ES%x", (omap_rev() >> 12) & 0xf);
 182
 183         pr_info("%s", soc_name);
 184         if ((omap_rev() >> 8) & 0x0f)
 185                 pr_info("%s", soc_rev);
 186         pr_info("\n");
 187 }
 188
 189 #define OMAP3_SHOW_FEATURE(feat)                \
 190         if (omap3_has_ ##feat())                \
 191                 printk(#feat" ");
 192
 193 static void __init omap3_cpuinfo(void)
 194 {
 195         const char *cpu_name;
 196
 197         /*
 198          * OMAP3430 and OMAP3530 are assumed to be same.
 199          *
 200          * OMAP3525, OMAP3515 and OMAP3503 can be detected only based
 201          * on available features. Upon detection, update the CPU id
 202          * and CPU class bits.
 203          */
 204         if (cpu_is_omap3630()) {
 205                 cpu_name = "OMAP3630";
 206         } else if (soc_is_am35xx()) {
 207                 cpu_name = (omap3_has_sgx()) ? "AM3517" : "AM3505";
 208         } else if (cpu_is_ti816x()) {
 209                 cpu_name = "TI816X";
 210         } else if (soc_is_am335x()) {
 211                 cpu_name =  "AM335X";
 212         } else if (cpu_is_ti814x()) {
 213                 cpu_name = "TI814X";
 214         } else if (omap3_has_iva() && omap3_has_sgx()) {
 215                 /* OMAP3430, OMAP3525, OMAP3515, OMAP3503 devices */
 216                 cpu_name = "OMAP3430/3530";
 217         } else if (omap3_has_iva()) {
 218                 cpu_name = "OMAP3525";
 219         } else if (omap3_has_sgx()) {
 220                 cpu_name = "OMAP3515";
 221         } else {
 222                 cpu_name = "OMAP3503";
 223         }
 224
 225         sprintf(soc_name, "%s", cpu_name);
 226
 227         /* Print verbose information */
 228         pr_info("%s %s (", soc_name, soc_rev);
 229
 230         OMAP3_SHOW_FEATURE(l2cache);
 231         OMAP3_SHOW_FEATURE(iva);
 232         OMAP3_SHOW_FEATURE(sgx);
 233         OMAP3_SHOW_FEATURE(neon);
 234         OMAP3_SHOW_FEATURE(isp);
 235         OMAP3_SHOW_FEATURE(192mhz_clk);
 236
 237         printk(")\n");
 238 }
 239
 240 #define OMAP3_CHECK_FEATURE(status,feat)                                \
 241         if (((status & OMAP3_ ##feat## _MASK)                           \
 242                 >> OMAP3_ ##feat## _SHIFT) != FEAT_ ##feat## _NONE) {   \
 243                 omap_features |= OMAP3_HAS_ ##feat;                     \
 244         }
 245
 246 void __init omap3xxx_check_features(void)
 247 {
 248         u32 status;
 249
 250         omap_features = 0;
 251
 252         status = omap_ctrl_readl(OMAP3_CONTROL_OMAP_STATUS);
 253
 254         OMAP3_CHECK_FEATURE(status, L2CACHE);
 255         OMAP3_CHECK_FEATURE(status, IVA);
 256         OMAP3_CHECK_FEATURE(status, SGX);
 257         OMAP3_CHECK_FEATURE(status, NEON);
 258         OMAP3_CHECK_FEATURE(status, ISP);
 259         if (cpu_is_omap3630())
 260                 omap_features |= OMAP3_HAS_192MHZ_CLK;
 261         if (cpu_is_omap3430() || cpu_is_omap3630())
 262                 omap_features |= OMAP3_HAS_IO_WAKEUP;
 263         if (cpu_is_omap3630() || omap_rev() == OMAP3430_REV_ES3_1 ||
 264             omap_rev() == OMAP3430_REV_ES3_1_2)
 265                 omap_features |= OMAP3_HAS_IO_CHAIN_CTRL;
 266
 267         omap_features |= OMAP3_HAS_SDRC;
 268
 269         /*
 270          * am35x fixups:
 271          * - The am35x Chip ID register has bits 12, 7:5, and 3:2 marked as
 272          *   reserved and therefore return 0 when read.  Unfortunately,
 273          *   OMAP3_CHECK_FEATURE() will interpret some of those zeroes to
 274          *   mean that a feature is present even though it isn't so clear
 275          *   the incorrectly set feature bits.
 276          */
 277         if (soc_is_am35xx())
 278                 omap_features &= ~(OMAP3_HAS_IVA | OMAP3_HAS_ISP);
 279
 280         /*
 281          * TODO: Get additional info (where applicable)
 282          *       e.g. Size of L2 cache.
 283          */
 284
 285         omap3_cpuinfo();
 286 }
 287
 288 void __init omap4xxx_check_features(void)
 289 {
 290         u32 si_type;
 291
 292         si_type =
 293         (read_tap_reg(OMAP4_CTRL_MODULE_CORE_STD_FUSE_PROD_ID_1) >> 16) & 0x03;
 294
 295         if (si_type == OMAP4_SILICON_TYPE_PERFORMANCE)
 296                 omap_features = OMAP4_HAS_PERF_SILICON;
 297 }
 298
 299 void __init ti81xx_check_features(void)
 300 {
 301         omap_features = OMAP3_HAS_NEON;
 302         omap3_cpuinfo();
 303 }
 304
 305 void __init omap3xxx_check_revision(void)
 306 {
 307         const char *cpu_rev;
 308         u32 cpuid, idcode;
 309         u16 hawkeye;
 310         u8 rev;
 311
 312         /*
 313          * We cannot access revision registers on ES1.0.
 314          * If the processor type is Cortex-A8 and the revision is 0x0
 315          * it means its Cortex r0p0 which is 3430 ES1.0.
 316          */
 317         cpuid = read_cpuid_id();
 318         if ((((cpuid >> 4) & 0xfff) == 0xc08) && ((cpuid & 0xf) == 0x0)) {
 319                 omap_revision = OMAP3430_REV_ES1_0;
 320                 cpu_rev = "1.0";
 321                 return;
 322         }
 323
 324         /*
 325          * Detection for 34xx ES2.0 and above can be done with just
 326          * hawkeye and rev. See TRM 1.5.2 Device Identification.
 327          * Note that rev does not map directly to our defined processor
 328          * revision numbers as ES1.0 uses value 0.
 329          */
 330         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 331         hawkeye = (idcode >> 12) & 0xffff;
 332         rev = (idcode >> 28) & 0xff;
 333
 334         switch (hawkeye) {
 335         case 0xb7ae:
 336                 /* Handle 34xx/35xx devices */
 337                 switch (rev) {
 338                 case 0: /* Take care of early samples */
 339                 case 1:
 340                         omap_revision = OMAP3430_REV_ES2_0;
 341                         cpu_rev = "2.0";
 342                         break;
 343                 case 2:
 344                         omap_revision = OMAP3430_REV_ES2_1;
 345                         cpu_rev = "2.1";
 346                         break;
 347                 case 3:
 348                         omap_revision = OMAP3430_REV_ES3_0;
 349                         cpu_rev = "3.0";
 350                         break;
 351                 case 4:
 352                         omap_revision = OMAP3430_REV_ES3_1;
 353                         cpu_rev = "3.1";
 354                         break;
 355                 case 7:
 356                 /* FALLTHROUGH */
 357                 default:
 358                         /* Use the latest known revision as default */
 359                         omap_revision = OMAP3430_REV_ES3_1_2;
 360                         cpu_rev = "3.1.2";
 361                 }
 362                 break;
 363         case 0xb868:
 364                 /*
 365                  * Handle OMAP/AM 3505/3517 devices
 366                  *
 367                  * Set the device to be OMAP3517 here. Actual device
 368                  * is identified later based on the features.
 369                  */
 370                 switch (rev) {
 371                 case 0:
 372                         omap_revision = AM35XX_REV_ES1_0;
 373                         cpu_rev = "1.0";
 374                         break;
 375                 case 1:
 376                 /* FALLTHROUGH */
 377                 default:
 378                         omap_revision = AM35XX_REV_ES1_1;
 379                         cpu_rev = "1.1";
 380                 }
 381                 break;
 382         case 0xb891:
 383                 /* Handle 36xx devices */
 384
 385                 switch(rev) {
 386                 case 0: /* Take care of early samples */
 387                         omap_revision = OMAP3630_REV_ES1_0;
 388                         cpu_rev = "1.0";
 389                         break;
 390                 case 1:
 391                         omap_revision = OMAP3630_REV_ES1_1;
 392                         cpu_rev = "1.1";
 393                         break;
 394                 case 2:
 395                 /* FALLTHROUGH */
 396                 default:
 397                         omap_revision = OMAP3630_REV_ES1_2;
 398                         cpu_rev = "1.2";
 399                 }
 400                 break;
 401         case 0xb81e:
 402                 switch (rev) {
 403                 case 0:
 404                         omap_revision = TI8168_REV_ES1_0;
 405                         cpu_rev = "1.0";
 406                         break;
 407                 case 1:
 408                 /* FALLTHROUGH */
 409                 default:
 410                         omap_revision = TI8168_REV_ES1_1;
 411                         cpu_rev = "1.1";
 412                         break;
 413                 }
 414                 break;
 415         case 0xb944:
 416                 switch (rev) {
 417                 case 0:
 418                         omap_revision = AM335X_REV_ES1_0;
 419                         cpu_rev = "1.0";
 420                         break;
 421                 case 1:
 422                 /* FALLTHROUGH */
 423                 default:
 424                         omap_revision = AM335X_REV_ES2_0;
 425                         cpu_rev = "2.0";
 426                         break;
 427                 }
 428                 break;
 429         case 0xb8f2:
 430                 switch (rev) {
 431                 case 0:
 432                 /* FALLTHROUGH */
 433                 case 1:
 434                         omap_revision = TI8148_REV_ES1_0;
 435                         cpu_rev = "1.0";
 436                         break;
 437                 case 2:
 438                         omap_revision = TI8148_REV_ES2_0;
 439                         cpu_rev = "2.0";
 440                         break;
 441                 case 3:
 442                 /* FALLTHROUGH */
 443                 default:
 444                         omap_revision = TI8148_REV_ES2_1;
 445                         cpu_rev = "2.1";
 446                         break;
 447                 }
 448                 break;
 449         default:
 450                 /* Unknown default to latest silicon rev as default */
 451                 omap_revision = OMAP3630_REV_ES1_2;
 452                 cpu_rev = "1.2";
 453                 pr_warn("Warning: unknown chip type; assuming OMAP3630ES1.2\n");
 454         }
 455         sprintf(soc_rev, "ES%s", cpu_rev);
 456 }
 457
 458 void __init omap4xxx_check_revision(void)
 459 {
 460         u32 idcode;
 461         u16 hawkeye;
 462         u8 rev;
 463
 464         /*
 465          * The IC rev detection is done with hawkeye and rev.
 466          * Note that rev does not map directly to defined processor
 467          * revision numbers as ES1.0 uses value 0.
 468          */
 469         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 470         hawkeye = (idcode >> 12) & 0xffff;
 471         rev = (idcode >> 28) & 0xf;
 472
 473         /*
 474          * Few initial 4430 ES2.0 samples IDCODE is same as ES1.0
 475          * Use ARM register to detect the correct ES version
 476          */
 477         if (!rev && (hawkeye != 0xb94e) && (hawkeye != 0xb975)) {
 478                 idcode = read_cpuid_id();
 479                 rev = (idcode & 0xf) - 1;
 480         }
 481
 482         switch (hawkeye) {
 483         case 0xb852:
 484                 switch (rev) {
 485                 case 0:
 486                         omap_revision = OMAP4430_REV_ES1_0;
 487                         break;
 488                 case 1:
 489                 default:
 490                         omap_revision = OMAP4430_REV_ES2_0;
 491                 }
 492                 break;
 493         case 0xb95c:
 494                 switch (rev) {
 495                 case 3:
 496                         omap_revision = OMAP4430_REV_ES2_1;
 497                         break;
 498                 case 4:
 499                         omap_revision = OMAP4430_REV_ES2_2;
 500                         break;
 501                 case 6:
 502                 default:
 503                         omap_revision = OMAP4430_REV_ES2_3;
 504                 }
 505                 break;
 506         case 0xb94e:
 507                 switch (rev) {
 508                 case 0:
 509                         omap_revision = OMAP4460_REV_ES1_0;
 510                         break;
 511                 case 2:
 512                 default:
 513                         omap_revision = OMAP4460_REV_ES1_1;
 514                         break;
 515                 }
 516                 break;
 517         case 0xb975:
 518                 switch (rev) {
 519                 case 0:
 520                 default:
 521                         omap_revision = OMAP4470_REV_ES1_0;
 522                         break;
 523                 }
 524                 break;
 525         default:
 526                 /* Unknown default to latest silicon rev as default */
 527                 omap_revision = OMAP4430_REV_ES2_3;
 528         }
 529
 530         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 531         sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
 532                                                 (omap_rev() >> 8) & 0xf);
 533         pr_info("%s %s\n", soc_name, soc_rev);
 534 }
 535
 536 void __init omap5xxx_check_revision(void)
 537 {
 538         u32 idcode;
 539         u16 hawkeye;
 540         u8 rev;
 541
 542         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 543         hawkeye = (idcode >> 12) & 0xffff;
 544         rev = (idcode >> 28) & 0xff;
 545         switch (hawkeye) {
 546         case 0xb942:
 547                 switch (rev) {
 548                 case 0:
 549                         omap_revision = OMAP5430_REV_ES1_0;
 550                         break;
 551                 case 1:
 552                 default:
 553                         omap_revision = OMAP5430_REV_ES2_0;
 554                 }
 555                 break;
 556
 557         case 0xb998:
 558                 switch (rev) {
 559                 case 0:
 560                         omap_revision = OMAP5432_REV_ES1_0;
 561                         break;
 562                 case 1:
 563                 default:
 564                         omap_revision = OMAP5432_REV_ES2_0;
 565                 }
 566                 break;
 567
 568         default:
 569                 /* Unknown default to latest silicon rev as default*/
 570                 omap_revision = OMAP5430_REV_ES2_0;
 571         }
 572
 573         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 574         sprintf(soc_rev, "ES%d.0", (omap_rev() >> 12) & 0xf);
 575
 576         pr_info("%s %s\n", soc_name, soc_rev);
 577 }
 578
 579 /*
 580  * Set up things for map_io and processor detection later on. Gets called
 581  * pretty much first thing from board init. For multi-omap, this gets
 582  * cpu_is_omapxxxx() working accurately enough for map_io. Then we'll try to
 583  * detect the exact revision later on in omap2_detect_revision() once map_io
 584  * is done.
 585  */
 586 void __init omap2_set_globals_tap(u32 class, void __iomem *tap)
 587 {
 588         omap_revision = class;
 589         tap_base = tap;
 590
 591         /* XXX What is this intended to do? */
 592         if (cpu_is_omap34xx())
 593                 tap_prod_id = 0x0210;
 594         else
 595                 tap_prod_id = 0x0208;
 596 }
 597
 598 #ifdef CONFIG_SOC_BUS
 599
 600 static const char const *omap_types[] = {
 601         [OMAP2_DEVICE_TYPE_TEST]        = "TST",
 602         [OMAP2_DEVICE_TYPE_EMU]         = "EMU",
 603         [OMAP2_DEVICE_TYPE_SEC]         = "HS",
 604         [OMAP2_DEVICE_TYPE_GP]          = "GP",
 605         [OMAP2_DEVICE_TYPE_BAD]         = "BAD",
 606 };
 607
 608 static const char * __init omap_get_family(void)
 609 {
 610         if (cpu_is_omap24xx())
 611                 return kasprintf(GFP_KERNEL, "OMAP2");
 612         else if (cpu_is_omap34xx())
 613                 return kasprintf(GFP_KERNEL, "OMAP3");
 614         else if (cpu_is_omap44xx())
 615                 return kasprintf(GFP_KERNEL, "OMAP4");
 616         else if (soc_is_omap54xx())
 617                 return kasprintf(GFP_KERNEL, "OMAP5");
 618         else
 619                 return kasprintf(GFP_KERNEL, "Unknown");
 620 }
 621
 622 static ssize_t omap_get_type(struct device *dev,
 623                                         struct device_attribute *attr,
 624                                         char *buf)
 625 {
 626         return sprintf(buf, "%s\n", omap_types[omap_type()]);
 627 }
 628
 629 static struct device_attribute omap_soc_attr =
 630         __ATTR(type,  S_IRUGO, omap_get_type,  NULL);
 631
 632 void __init omap_soc_device_init(void)
 633 {
 634         struct device *parent;
 635         struct soc_device *soc_dev;
 636         struct soc_device_attribute *soc_dev_attr;
 637
 638         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 639         if (!soc_dev_attr)
 640                 return;
 641
 642         soc_dev_attr->machine  = soc_name;
 643         soc_dev_attr->family   = omap_get_family();
 644         soc_dev_attr->revision = soc_rev;
 645
 646         soc_dev = soc_device_register(soc_dev_attr);
 647         if (IS_ERR_OR_NULL(soc_dev)) {
 648                 kfree(soc_dev_attr);
 649                 return;
 650         }
 651
 652         parent = soc_device_to_device(soc_dev);
 653         if (!IS_ERR_OR_NULL(parent))
 654                 device_create_file(parent, &omap_soc_attr);
 655 }
 656 #endif /* CONFIG_SOC_BUS */