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/random.h>
  22 #include <linux/slab.h>
  23
  24 #ifdef CONFIG_SOC_BUS
  25 #include <linux/sys_soc.h>
  26 #endif
  27
  28 #include <asm/cputype.h>
  29
  30 #include "common.h"
  31
  32 #include "id.h"
  33
  34 #include "soc.h"
  35 #include "control.h"
  36
  37 #define OMAP4_SILICON_TYPE_STANDARD             0x01
  38 #define OMAP4_SILICON_TYPE_PERFORMANCE          0x02
  39
  40 #define OMAP_SOC_MAX_NAME_LENGTH                16
  41
  42 static unsigned int omap_revision;
  43 static char soc_name[OMAP_SOC_MAX_NAME_LENGTH];
  44 static char soc_rev[OMAP_SOC_MAX_NAME_LENGTH];
  45 u32 omap_features;
  46
  47 unsigned int omap_rev(void)
  48 {
  49         return omap_revision;
  50 }
  51 EXPORT_SYMBOL(omap_rev);
  52
  53 int omap_type(void)
  54 {
  55         static u32 val = OMAP2_DEVICETYPE_MASK;
  56
  57         if (val < OMAP2_DEVICETYPE_MASK)
  58                 return val;
  59
  60         if (soc_is_omap24xx()) {
  61                 val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);
  62         } else if (soc_is_ti81xx()) {
  63                 val = omap_ctrl_readl(TI81XX_CONTROL_STATUS);
  64         } else if (soc_is_am33xx() || soc_is_am43xx()) {
  65                 val = omap_ctrl_readl(AM33XX_CONTROL_STATUS);
  66         } else if (soc_is_omap34xx()) {
  67                 val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
  68         } else if (soc_is_omap44xx()) {
  69                 val = omap_ctrl_readl(OMAP4_CTRL_MODULE_CORE_STATUS);
  70         } else if (soc_is_omap54xx() || soc_is_dra7xx()) {
  71                 val = omap_ctrl_readl(OMAP5XXX_CONTROL_STATUS);
  72                 val &= OMAP5_DEVICETYPE_MASK;
  73                 val >>= 6;
  74                 goto out;
  75         } else {
  76                 pr_err("Cannot detect omap type!\n");
  77                 goto out;
  78         }
  79
  80         val &= OMAP2_DEVICETYPE_MASK;
  81         val >>= 8;
  82
  83 out:
  84         return val;
  85 }
  86 EXPORT_SYMBOL(omap_type);
  87
  88
  89 /*----------------------------------------------------------------------------*/
  90
  91 #define OMAP_TAP_IDCODE         0x0204
  92 #define OMAP_TAP_DIE_ID_0       0x0218
  93 #define OMAP_TAP_DIE_ID_1       0x021C
  94 #define OMAP_TAP_DIE_ID_2       0x0220
  95 #define OMAP_TAP_DIE_ID_3       0x0224
  96
  97 #define OMAP_TAP_DIE_ID_44XX_0  0x0200
  98 #define OMAP_TAP_DIE_ID_44XX_1  0x0208
  99 #define OMAP_TAP_DIE_ID_44XX_2  0x020c
 100 #define OMAP_TAP_DIE_ID_44XX_3  0x0210
 101
 102 #define read_tap_reg(reg)       readl_relaxed(tap_base  + (reg))
 103
 104 struct omap_id {
 105         u16     hawkeye;        /* Silicon type (Hawkeye id) */
 106         u8      dev;            /* Device type from production_id reg */
 107         u32     type;           /* Combined type id copied to omap_revision */
 108 };
 109
 110 /* Register values to detect the OMAP version */
 111 static struct omap_id omap_ids[] __initdata = {
 112         { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200024 },
 113         { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201024 },
 114         { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202024 },
 115         { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220024 },
 116         { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230024 },
 117         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300024 },
 118 };
 119
 120 static void __iomem *tap_base;
 121 static u16 tap_prod_id;
 122
 123 void omap_get_die_id(struct omap_die_id *odi)
 124 {
 125         if (soc_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
 126                 odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_0);
 127                 odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_1);
 128                 odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_2);
 129                 odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_3);
 130
 131                 return;
 132         }
 133         odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_0);
 134         odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_1);
 135         odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_2);
 136         odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_3);
 137 }
 138
 139 static int __init omap_feed_randpool(void)
 140 {
 141         struct omap_die_id odi;
 142
 143         /* Throw the die ID into the entropy pool at boot */
 144         omap_get_die_id(&odi);
 145         add_device_randomness(&odi, sizeof(odi));
 146         return 0;
 147 }
 148 omap_device_initcall(omap_feed_randpool);
 149
 150 void __init omap2xxx_check_revision(void)
 151 {
 152         int i, j;
 153         u32 idcode, prod_id;
 154         u16 hawkeye;
 155         u8  dev_type, rev;
 156         struct omap_die_id odi;
 157
 158         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 159         prod_id = read_tap_reg(tap_prod_id);
 160         hawkeye = (idcode >> 12) & 0xffff;
 161         rev = (idcode >> 28) & 0x0f;
 162         dev_type = (prod_id >> 16) & 0x0f;
 163         omap_get_die_id(&odi);
 164
 165         pr_debug("OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
 166                  idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
 167         pr_debug("OMAP_TAP_DIE_ID_0: 0x%08x\n", odi.id_0);
 168         pr_debug("OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
 169                  odi.id_1, (odi.id_1 >> 28) & 0xf);
 170         pr_debug("OMAP_TAP_DIE_ID_2: 0x%08x\n", odi.id_2);
 171         pr_debug("OMAP_TAP_DIE_ID_3: 0x%08x\n", odi.id_3);
 172         pr_debug("OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
 173                  prod_id, dev_type);
 174
 175         /* Check hawkeye ids */
 176         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 177                 if (hawkeye == omap_ids[i].hawkeye)
 178                         break;
 179         }
 180
 181         if (i == ARRAY_SIZE(omap_ids)) {
 182                 printk(KERN_ERR "Unknown OMAP CPU id\n");
 183                 return;
 184         }
 185
 186         for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
 187                 if (dev_type == omap_ids[j].dev)
 188                         break;
 189         }
 190
 191         if (j == ARRAY_SIZE(omap_ids)) {
 192                 pr_err("Unknown OMAP device type. Handling it as OMAP%04x\n",
 193                        omap_ids[i].type >> 16);
 194                 j = i;
 195         }
 196
 197         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 198         sprintf(soc_rev, "ES%x", (omap_rev() >> 12) & 0xf);
 199
 200         pr_info("%s", soc_name);
 201         if ((omap_rev() >> 8) & 0x0f)
 202                 pr_info("%s", soc_rev);
 203         pr_info("\n");
 204 }
 205
 206 #define OMAP3_SHOW_FEATURE(feat)                \
 207         if (omap3_has_ ##feat())                \
 208                 printk(#feat" ");
 209
 210 static void __init omap3_cpuinfo(void)
 211 {
 212         const char *cpu_name;
 213
 214         /*
 215          * OMAP3430 and OMAP3530 are assumed to be same.
 216          *
 217          * OMAP3525, OMAP3515 and OMAP3503 can be detected only based
 218          * on available features. Upon detection, update the CPU id
 219          * and CPU class bits.
 220          */
 221         if (soc_is_omap3630()) {
 222                 cpu_name = "OMAP3630";
 223         } else if (soc_is_am35xx()) {
 224                 cpu_name = (omap3_has_sgx()) ? "AM3517" : "AM3505";
 225         } else if (soc_is_ti816x()) {
 226                 cpu_name = "TI816X";
 227         } else if (soc_is_am335x()) {
 228                 cpu_name =  "AM335X";
 229         } else if (soc_is_am437x()) {
 230                 cpu_name =  "AM437x";
 231         } else if (soc_is_ti814x()) {
 232                 cpu_name = "TI814X";
 233         } else if (omap3_has_iva() && omap3_has_sgx()) {
 234                 /* OMAP3430, OMAP3525, OMAP3515, OMAP3503 devices */
 235                 cpu_name = "OMAP3430/3530";
 236         } else if (omap3_has_iva()) {
 237                 cpu_name = "OMAP3525";
 238         } else if (omap3_has_sgx()) {
 239                 cpu_name = "OMAP3515";
 240         } else {
 241                 cpu_name = "OMAP3503";
 242         }
 243
 244         sprintf(soc_name, "%s", cpu_name);
 245
 246         /* Print verbose information */
 247         pr_info("%s %s (", soc_name, soc_rev);
 248
 249         OMAP3_SHOW_FEATURE(l2cache);
 250         OMAP3_SHOW_FEATURE(iva);
 251         OMAP3_SHOW_FEATURE(sgx);
 252         OMAP3_SHOW_FEATURE(neon);
 253         OMAP3_SHOW_FEATURE(isp);
 254         OMAP3_SHOW_FEATURE(192mhz_clk);
 255
 256         printk(")\n");
 257 }
 258
 259 #define OMAP3_CHECK_FEATURE(status,feat)                                \
 260         if (((status & OMAP3_ ##feat## _MASK)                           \
 261                 >> OMAP3_ ##feat## _SHIFT) != FEAT_ ##feat## _NONE) {   \
 262                 omap_features |= OMAP3_HAS_ ##feat;                     \
 263         }
 264
 265 void __init omap3xxx_check_features(void)
 266 {
 267         u32 status;
 268
 269         omap_features = 0;
 270
 271         status = omap_ctrl_readl(OMAP3_CONTROL_OMAP_STATUS);
 272
 273         OMAP3_CHECK_FEATURE(status, L2CACHE);
 274         OMAP3_CHECK_FEATURE(status, IVA);
 275         OMAP3_CHECK_FEATURE(status, SGX);
 276         OMAP3_CHECK_FEATURE(status, NEON);
 277         OMAP3_CHECK_FEATURE(status, ISP);
 278         if (soc_is_omap3630())
 279                 omap_features |= OMAP3_HAS_192MHZ_CLK;
 280         if (soc_is_omap3430() || soc_is_omap3630())
 281                 omap_features |= OMAP3_HAS_IO_WAKEUP;
 282         if (soc_is_omap3630() || omap_rev() == OMAP3430_REV_ES3_1 ||
 283             omap_rev() == OMAP3430_REV_ES3_1_2)
 284                 omap_features |= OMAP3_HAS_IO_CHAIN_CTRL;
 285
 286         omap_features |= OMAP3_HAS_SDRC;
 287
 288         /*
 289          * am35x fixups:
 290          * - The am35x Chip ID register has bits 12, 7:5, and 3:2 marked as
 291          *   reserved and therefore return 0 when read.  Unfortunately,
 292          *   OMAP3_CHECK_FEATURE() will interpret some of those zeroes to
 293          *   mean that a feature is present even though it isn't so clear
 294          *   the incorrectly set feature bits.
 295          */
 296         if (soc_is_am35xx())
 297                 omap_features &= ~(OMAP3_HAS_IVA | OMAP3_HAS_ISP);
 298
 299         /*
 300          * TODO: Get additional info (where applicable)
 301          *       e.g. Size of L2 cache.
 302          */
 303
 304         omap3_cpuinfo();
 305 }
 306
 307 void __init omap4xxx_check_features(void)
 308 {
 309         u32 si_type;
 310
 311         si_type =
 312         (read_tap_reg(OMAP4_CTRL_MODULE_CORE_STD_FUSE_PROD_ID_1) >> 16) & 0x03;
 313
 314         if (si_type == OMAP4_SILICON_TYPE_PERFORMANCE)
 315                 omap_features = OMAP4_HAS_PERF_SILICON;
 316 }
 317
 318 void __init ti81xx_check_features(void)
 319 {
 320         omap_features = OMAP3_HAS_NEON;
 321         omap3_cpuinfo();
 322 }
 323
 324 void __init am33xx_check_features(void)
 325 {
 326         u32 status;
 327
 328         omap_features = OMAP3_HAS_NEON;
 329
 330         status = omap_ctrl_readl(AM33XX_DEV_FEATURE);
 331         if (status & AM33XX_SGX_MASK)
 332                 omap_features |= OMAP3_HAS_SGX;
 333
 334         omap3_cpuinfo();
 335 }
 336
 337 void __init omap3xxx_check_revision(void)
 338 {
 339         const char *cpu_rev;
 340         u32 cpuid, idcode;
 341         u16 hawkeye;
 342         u8 rev;
 343
 344         /*
 345          * We cannot access revision registers on ES1.0.
 346          * If the processor type is Cortex-A8 and the revision is 0x0
 347          * it means its Cortex r0p0 which is 3430 ES1.0.
 348          */
 349         cpuid = read_cpuid_id();
 350         if ((((cpuid >> 4) & 0xfff) == 0xc08) && ((cpuid & 0xf) == 0x0)) {
 351                 omap_revision = OMAP3430_REV_ES1_0;
 352                 cpu_rev = "1.0";
 353                 return;
 354         }
 355
 356         /*
 357          * Detection for 34xx ES2.0 and above can be done with just
 358          * hawkeye and rev. See TRM 1.5.2 Device Identification.
 359          * Note that rev does not map directly to our defined processor
 360          * revision numbers as ES1.0 uses value 0.
 361          */
 362         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 363         hawkeye = (idcode >> 12) & 0xffff;
 364         rev = (idcode >> 28) & 0xff;
 365
 366         switch (hawkeye) {
 367         case 0xb7ae:
 368                 /* Handle 34xx/35xx devices */
 369                 switch (rev) {
 370                 case 0: /* Take care of early samples */
 371                 case 1:
 372                         omap_revision = OMAP3430_REV_ES2_0;
 373                         cpu_rev = "2.0";
 374                         break;
 375                 case 2:
 376                         omap_revision = OMAP3430_REV_ES2_1;
 377                         cpu_rev = "2.1";
 378                         break;
 379                 case 3:
 380                         omap_revision = OMAP3430_REV_ES3_0;
 381                         cpu_rev = "3.0";
 382                         break;
 383                 case 4:
 384                         omap_revision = OMAP3430_REV_ES3_1;
 385                         cpu_rev = "3.1";
 386                         break;
 387                 case 7:
 388                 /* FALLTHROUGH */
 389                 default:
 390                         /* Use the latest known revision as default */
 391                         omap_revision = OMAP3430_REV_ES3_1_2;
 392                         cpu_rev = "3.1.2";
 393                 }
 394                 break;
 395         case 0xb868:
 396                 /*
 397                  * Handle OMAP/AM 3505/3517 devices
 398                  *
 399                  * Set the device to be OMAP3517 here. Actual device
 400                  * is identified later based on the features.
 401                  */
 402                 switch (rev) {
 403                 case 0:
 404                         omap_revision = AM35XX_REV_ES1_0;
 405                         cpu_rev = "1.0";
 406                         break;
 407                 case 1:
 408                 /* FALLTHROUGH */
 409                 default:
 410                         omap_revision = AM35XX_REV_ES1_1;
 411                         cpu_rev = "1.1";
 412                 }
 413                 break;
 414         case 0xb891:
 415                 /* Handle 36xx devices */
 416
 417                 switch(rev) {
 418                 case 0: /* Take care of early samples */
 419                         omap_revision = OMAP3630_REV_ES1_0;
 420                         cpu_rev = "1.0";
 421                         break;
 422                 case 1:
 423                         omap_revision = OMAP3630_REV_ES1_1;
 424                         cpu_rev = "1.1";
 425                         break;
 426                 case 2:
 427                 /* FALLTHROUGH */
 428                 default:
 429                         omap_revision = OMAP3630_REV_ES1_2;
 430                         cpu_rev = "1.2";
 431                 }
 432                 break;
 433         case 0xb81e:
 434                 switch (rev) {
 435                 case 0:
 436                         omap_revision = TI8168_REV_ES1_0;
 437                         cpu_rev = "1.0";
 438                         break;
 439                 case 1:
 440                         omap_revision = TI8168_REV_ES1_1;
 441                         cpu_rev = "1.1";
 442                         break;
 443                 case 2:
 444                         omap_revision = TI8168_REV_ES2_0;
 445                         cpu_rev = "2.0";
 446                         break;
 447                 case 3:
 448                         /* FALLTHROUGH */
 449                 default:
 450                         omap_revision = TI8168_REV_ES2_1;
 451                         cpu_rev = "2.1";
 452                 }
 453                 break;
 454         case 0xb944:
 455                 switch (rev) {
 456                 case 0:
 457                         omap_revision = AM335X_REV_ES1_0;
 458                         cpu_rev = "1.0";
 459                         break;
 460                 case 1:
 461                         omap_revision = AM335X_REV_ES2_0;
 462                         cpu_rev = "2.0";
 463                         break;
 464                 case 2:
 465                 /* FALLTHROUGH */
 466                 default:
 467                         omap_revision = AM335X_REV_ES2_1;
 468                         cpu_rev = "2.1";
 469                         break;
 470                 }
 471                 break;
 472         case 0xb98c:
 473                 switch (rev) {
 474                 case 0:
 475                         omap_revision = AM437X_REV_ES1_0;
 476                         cpu_rev = "1.0";
 477                         break;
 478                 case 1:
 479                         omap_revision = AM437X_REV_ES1_1;
 480                         cpu_rev = "1.1";
 481                         break;
 482                 case 2:
 483                 /* FALLTHROUGH */
 484                 default:
 485                         omap_revision = AM437X_REV_ES1_2;
 486                         cpu_rev = "1.2";
 487                         break;
 488                 }
 489                 break;
 490         case 0xb8f2:
 491                 switch (rev) {
 492                 case 0:
 493                 /* FALLTHROUGH */
 494                 case 1:
 495                         omap_revision = TI8148_REV_ES1_0;
 496                         cpu_rev = "1.0";
 497                         break;
 498                 case 2:
 499                         omap_revision = TI8148_REV_ES2_0;
 500                         cpu_rev = "2.0";
 501                         break;
 502                 case 3:
 503                 /* FALLTHROUGH */
 504                 default:
 505                         omap_revision = TI8148_REV_ES2_1;
 506                         cpu_rev = "2.1";
 507                         break;
 508                 }
 509                 break;
 510         default:
 511                 /* Unknown default to latest silicon rev as default */
 512                 omap_revision = OMAP3630_REV_ES1_2;
 513                 cpu_rev = "1.2";
 514                 pr_warn("Warning: unknown chip type; assuming OMAP3630ES1.2\n");
 515         }
 516         sprintf(soc_rev, "ES%s", cpu_rev);
 517 }
 518
 519 void __init omap4xxx_check_revision(void)
 520 {
 521         u32 idcode;
 522         u16 hawkeye;
 523         u8 rev;
 524
 525         /*
 526          * The IC rev detection is done with hawkeye and rev.
 527          * Note that rev does not map directly to defined processor
 528          * revision numbers as ES1.0 uses value 0.
 529          */
 530         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 531         hawkeye = (idcode >> 12) & 0xffff;
 532         rev = (idcode >> 28) & 0xf;
 533
 534         /*
 535          * Few initial 4430 ES2.0 samples IDCODE is same as ES1.0
 536          * Use ARM register to detect the correct ES version
 537          */
 538         if (!rev && (hawkeye != 0xb94e) && (hawkeye != 0xb975)) {
 539                 idcode = read_cpuid_id();
 540                 rev = (idcode & 0xf) - 1;
 541         }
 542
 543         switch (hawkeye) {
 544         case 0xb852:
 545                 switch (rev) {
 546                 case 0:
 547                         omap_revision = OMAP4430_REV_ES1_0;
 548                         break;
 549                 case 1:
 550                 default:
 551                         omap_revision = OMAP4430_REV_ES2_0;
 552                 }
 553                 break;
 554         case 0xb95c:
 555                 switch (rev) {
 556                 case 3:
 557                         omap_revision = OMAP4430_REV_ES2_1;
 558                         break;
 559                 case 4:
 560                         omap_revision = OMAP4430_REV_ES2_2;
 561                         break;
 562                 case 6:
 563                 default:
 564                         omap_revision = OMAP4430_REV_ES2_3;
 565                 }
 566                 break;
 567         case 0xb94e:
 568                 switch (rev) {
 569                 case 0:
 570                         omap_revision = OMAP4460_REV_ES1_0;
 571                         break;
 572                 case 2:
 573                 default:
 574                         omap_revision = OMAP4460_REV_ES1_1;
 575                         break;
 576                 }
 577                 break;
 578         case 0xb975:
 579                 switch (rev) {
 580                 case 0:
 581                 default:
 582                         omap_revision = OMAP4470_REV_ES1_0;
 583                         break;
 584                 }
 585                 break;
 586         default:
 587                 /* Unknown default to latest silicon rev as default */
 588                 omap_revision = OMAP4430_REV_ES2_3;
 589         }
 590
 591         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 592         sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
 593                                                 (omap_rev() >> 8) & 0xf);
 594         pr_info("%s %s\n", soc_name, soc_rev);
 595 }
 596
 597 void __init omap5xxx_check_revision(void)
 598 {
 599         u32 idcode;
 600         u16 hawkeye;
 601         u8 rev;
 602
 603         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 604         hawkeye = (idcode >> 12) & 0xffff;
 605         rev = (idcode >> 28) & 0xff;
 606         switch (hawkeye) {
 607         case 0xb942:
 608                 switch (rev) {
 609                 case 0:
 610                         /* No support for ES1.0 Test chip */
 611                         BUG();
 612                 case 1:
 613                 default:
 614                         omap_revision = OMAP5430_REV_ES2_0;
 615                 }
 616                 break;
 617
 618         case 0xb998:
 619                 switch (rev) {
 620                 case 0:
 621                         /* No support for ES1.0 Test chip */
 622                         BUG();
 623                 case 1:
 624                 default:
 625                         omap_revision = OMAP5432_REV_ES2_0;
 626                 }
 627                 break;
 628
 629         default:
 630                 /* Unknown default to latest silicon rev as default*/
 631                 omap_revision = OMAP5430_REV_ES2_0;
 632         }
 633
 634         sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
 635         sprintf(soc_rev, "ES%d.0", (omap_rev() >> 12) & 0xf);
 636
 637         pr_info("%s %s\n", soc_name, soc_rev);
 638 }
 639
 640 void __init dra7xxx_check_revision(void)
 641 {
 642         u32 idcode;
 643         u16 hawkeye;
 644         u8 rev;
 645
 646         idcode = read_tap_reg(OMAP_TAP_IDCODE);
 647         hawkeye = (idcode >> 12) & 0xffff;
 648         rev = (idcode >> 28) & 0xff;
 649         switch (hawkeye) {
 650         case 0xb990:
 651                 switch (rev) {
 652                 case 0:
 653                         omap_revision = DRA752_REV_ES1_0;
 654                         break;
 655                 case 1:
 656                         omap_revision = DRA752_REV_ES1_1;
 657                         break;
 658                 case 2:
 659                 default:
 660                         omap_revision = DRA752_REV_ES2_0;
 661                         break;
 662                 }
 663                 break;
 664
 665         case 0xb9bc:
 666                 switch (rev) {
 667                 case 0:
 668                         omap_revision = DRA722_REV_ES1_0;
 669                         break;
 670                 default:
 671                         /* If we have no new revisions */
 672                         omap_revision = DRA722_REV_ES1_0;
 673                         break;
 674                 }
 675                 break;
 676
 677         default:
 678                 /* Unknown default to latest silicon rev as default*/
 679                 pr_warn("%s: unknown idcode=0x%08x (hawkeye=0x%08x,rev=0x%x)\n",
 680                         __func__, idcode, hawkeye, rev);
 681                 omap_revision = DRA752_REV_ES2_0;
 682         }
 683
 684         sprintf(soc_name, "DRA%03x", omap_rev() >> 16);
 685         sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
 686                 (omap_rev() >> 8) & 0xf);
 687
 688         pr_info("%s %s\n", soc_name, soc_rev);
 689 }
 690
 691 /*
 692  * Set up things for map_io and processor detection later on. Gets called
 693  * pretty much first thing from board init. For multi-omap, this gets
 694  * cpu_is_omapxxxx() working accurately enough for map_io. Then we'll try to
 695  * detect the exact revision later on in omap2_detect_revision() once map_io
 696  * is done.
 697  */
 698 void __init omap2_set_globals_tap(u32 class, void __iomem *tap)
 699 {
 700         omap_revision = class;
 701         tap_base = tap;
 702
 703         /* XXX What is this intended to do? */
 704         if (soc_is_omap34xx())
 705                 tap_prod_id = 0x0210;
 706         else
 707                 tap_prod_id = 0x0208;
 708 }
 709
 710 #ifdef CONFIG_SOC_BUS
 711
 712 static const char * const omap_types[] = {
 713         [OMAP2_DEVICE_TYPE_TEST]        = "TST",
 714         [OMAP2_DEVICE_TYPE_EMU]         = "EMU",
 715         [OMAP2_DEVICE_TYPE_SEC]         = "HS",
 716         [OMAP2_DEVICE_TYPE_GP]          = "GP",
 717         [OMAP2_DEVICE_TYPE_BAD]         = "BAD",
 718 };
 719
 720 static const char * __init omap_get_family(void)
 721 {
 722         if (soc_is_omap24xx())
 723                 return kasprintf(GFP_KERNEL, "OMAP2");
 724         else if (soc_is_omap34xx())
 725                 return kasprintf(GFP_KERNEL, "OMAP3");
 726         else if (soc_is_omap44xx())
 727                 return kasprintf(GFP_KERNEL, "OMAP4");
 728         else if (soc_is_omap54xx())
 729                 return kasprintf(GFP_KERNEL, "OMAP5");
 730         else if (soc_is_am33xx() || soc_is_am335x())
 731                 return kasprintf(GFP_KERNEL, "AM33xx");
 732         else if (soc_is_am43xx())
 733                 return kasprintf(GFP_KERNEL, "AM43xx");
 734         else if (soc_is_dra7xx())
 735                 return kasprintf(GFP_KERNEL, "DRA7");
 736         else
 737                 return kasprintf(GFP_KERNEL, "Unknown");
 738 }
 739
 740 static ssize_t omap_get_type(struct device *dev,
 741                                         struct device_attribute *attr,
 742                                         char *buf)
 743 {
 744         return sprintf(buf, "%s\n", omap_types[omap_type()]);
 745 }
 746
 747 static struct device_attribute omap_soc_attr =
 748         __ATTR(type,  S_IRUGO, omap_get_type,  NULL);
 749
 750 void __init omap_soc_device_init(void)
 751 {
 752         struct device *parent;
 753         struct soc_device *soc_dev;
 754         struct soc_device_attribute *soc_dev_attr;
 755
 756         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 757         if (!soc_dev_attr)
 758                 return;
 759
 760         soc_dev_attr->machine  = soc_name;
 761         soc_dev_attr->family   = omap_get_family();
 762         soc_dev_attr->revision = soc_rev;
 763
 764         soc_dev = soc_device_register(soc_dev_attr);
 765         if (IS_ERR(soc_dev)) {
 766                 kfree(soc_dev_attr);
 767                 return;
 768         }
 769
 770         parent = soc_device_to_device(soc_dev);
 771         device_create_file(parent, &omap_soc_attr);
 772 }
 773 #endif /* CONFIG_SOC_BUS */