arch/mips/powertv/asic/asic_devices.c

   1 /*
   2  *                   ASIC Device List Intialization
   3  *
   4  * Description:  Defines the platform resources for the SA settop.
   5  *
   6  * Copyright (C) 2005-2009 Scientific-Atlanta, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  *
  22  * Author:       Ken Eppinett
  23  *               David Schleef <ds@schleef.org>
  24  *
  25  * Description:  Defines the platform resources for the SA settop.
  26  *
  27  * NOTE: The bootloader allocates persistent memory at an address which is
  28  * 16 MiB below the end of the highest address in KSEG0. All fixed
  29  * address memory reservations must avoid this region.
  30  */
  31
  32 #include <linux/device.h>
  33 #include <linux/kernel.h>
  34 #include <linux/init.h>
  35 #include <linux/resource.h>
  36 #include <linux/serial_reg.h>
  37 #include <linux/io.h>
  38 #include <linux/bootmem.h>
  39 #include <linux/mm.h>
  40 #include <linux/platform_device.h>
  41 #include <linux/module.h>
  42 #include <asm/page.h>
  43 #include <linux/swap.h>
  44 #include <linux/highmem.h>
  45 #include <linux/dma-mapping.h>
  46
  47 #include <asm/mach-powertv/asic.h>
  48 #include <asm/mach-powertv/asic_regs.h>
  49 #include <asm/mach-powertv/interrupts.h>
  50
  51 #ifdef CONFIG_BOOTLOADER_DRIVER
  52 #include <asm/mach-powertv/kbldr.h>
  53 #endif
  54 #include <asm/bootinfo.h>
  55
  56 #define BOOTLDRFAMILY(byte1, byte0) (((byte1) << 8) | (byte0))
  57
  58 /*
  59  * Forward Prototypes
  60  */
  61 static void pmem_setup_resource(void);
  62
  63 /*
  64  * Global Variables
  65  */
  66 enum asic_type asic;
  67
  68 unsigned int platform_features;
  69 unsigned int platform_family;
  70 struct register_map _asic_register_map;
  71 EXPORT_SYMBOL(_asic_register_map);              /* Exported for testing */
  72 unsigned long asic_phy_base;
  73 unsigned long asic_base;
  74 EXPORT_SYMBOL(asic_base);                       /* Exported for testing */
  75 struct resource *gp_resources;
  76 static bool usb_configured;
  77
  78 /*
  79  * Don't recommend to use it directly, it is usually used by kernel internally.
  80  * Portable code should be using interfaces such as ioremp, dma_map_single, etc.
  81  */
  82 unsigned long phys_to_bus_offset;
  83 EXPORT_SYMBOL(phys_to_bus_offset);
  84
  85 /*
  86  *
  87  * IO Resource Definition
  88  *
  89  */
  90
  91 struct resource asic_resource = {
  92         .name  = "ASIC Resource",
  93         .start = 0,
  94         .end   = ASIC_IO_SIZE,
  95         .flags = IORESOURCE_MEM,
  96 };
  97
  98 /*
  99  *
 100  * USB Host Resource Definition
 101  *
 102  */
 103
 104 static struct resource ehci_resources[] = {
 105         {
 106                 .parent = &asic_resource,
 107                 .start  = 0,
 108                 .end    = 0xff,
 109                 .flags  = IORESOURCE_MEM,
 110         },
 111         {
 112                 .start  = irq_usbehci,
 113                 .end    = irq_usbehci,
 114                 .flags  = IORESOURCE_IRQ,
 115         },
 116 };
 117
 118 static u64 ehci_dmamask = DMA_BIT_MASK(32);
 119
 120 static struct platform_device ehci_device = {
 121         .name = "powertv-ehci",
 122         .id = 0,
 123         .num_resources = 2,
 124         .resource = ehci_resources,
 125         .dev = {
 126                 .dma_mask = &ehci_dmamask,
 127                 .coherent_dma_mask = DMA_BIT_MASK(32),
 128         },
 129 };
 130
 131 static struct resource ohci_resources[] = {
 132         {
 133                 .parent = &asic_resource,
 134                 .start  = 0,
 135                 .end    = 0xff,
 136                 .flags  = IORESOURCE_MEM,
 137         },
 138         {
 139                 .start  = irq_usbohci,
 140                 .end    = irq_usbohci,
 141                 .flags  = IORESOURCE_IRQ,
 142         },
 143 };
 144
 145 static u64 ohci_dmamask = DMA_BIT_MASK(32);
 146
 147 static struct platform_device ohci_device = {
 148         .name = "powertv-ohci",
 149         .id = 0,
 150         .num_resources = 2,
 151         .resource = ohci_resources,
 152         .dev = {
 153                 .dma_mask = &ohci_dmamask,
 154                 .coherent_dma_mask = DMA_BIT_MASK(32),
 155         },
 156 };
 157
 158 static struct platform_device *platform_devices[] = {
 159         &ehci_device,
 160         &ohci_device,
 161 };
 162
 163 /*
 164  *
 165  * Platform Configuration and Device Initialization
 166  *
 167  */
 168 static void __init fs_update(int pe, int md, int sdiv, int disable_div_by_3)
 169 {
 170         int en_prg, byp, pwr, nsb, val;
 171         int sout;
 172
 173         sout = 1;
 174         en_prg = 1;
 175         byp = 0;
 176         nsb = 1;
 177         pwr = 1;
 178
 179         val = ((sdiv << 29) | (md << 24) | (pe<<8) | (sout<<3) | (byp<<2) |
 180                 (nsb<<1) | (disable_div_by_3<<5));
 181
 182         asic_write(val, usb_fs);
 183         asic_write(val | (en_prg<<4), usb_fs);
 184         asic_write(val | (en_prg<<4) | pwr, usb_fs);
 185 }
 186
 187 /*
 188  * Allow override of bootloader-specified model
 189  */
 190 static char __initdata cmdline[COMMAND_LINE_SIZE];
 191
 192 #define FORCEFAMILY_PARAM       "forcefamily"
 193
 194 static __init int check_forcefamily(unsigned char forced_family[2])
 195 {
 196         const char *p;
 197
 198         forced_family[0] = '\0';
 199         forced_family[1] = '\0';
 200
 201         /* Check the command line for a forcefamily directive */
 202         strncpy(cmdline, arcs_cmdline, COMMAND_LINE_SIZE - 1);
 203         p = strstr(cmdline, FORCEFAMILY_PARAM);
 204         if (p && (p != cmdline) && (*(p - 1) != ' '))
 205                 p = strstr(p, " " FORCEFAMILY_PARAM "=");
 206
 207         if (p) {
 208                 p += strlen(FORCEFAMILY_PARAM "=");
 209
 210                 if (*p == '\0' || *(p + 1) == '\0' ||
 211                         (*(p + 2) != '\0' && *(p + 2) != ' '))
 212                         pr_err(FORCEFAMILY_PARAM " must be exactly two "
 213                                 "characters long, ignoring value\n");
 214
 215                 else {
 216                         forced_family[0] = *p;
 217                         forced_family[1] = *(p + 1);
 218                 }
 219         }
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * platform_set_family - determine major platform family type.
 226  *
 227  * Returns family type; -1 if none
 228  * Returns the family type; -1 if none
 229  *
 230  */
 231 static __init noinline void platform_set_family(void)
 232 {
 233 #define BOOTLDRFAMILY(byte1, byte0) (((byte1) << 8) | (byte0))
 234
 235         unsigned char forced_family[2];
 236         unsigned short bootldr_family;
 237
 238         check_forcefamily(forced_family);
 239
 240         if (forced_family[0] != '\0' && forced_family[1] != '\0')
 241                 bootldr_family = BOOTLDRFAMILY(forced_family[0],
 242                         forced_family[1]);
 243         else {
 244
 245 #ifdef CONFIG_BOOTLOADER_DRIVER
 246                 bootldr_family = (unsigned short) kbldr_GetSWFamily();
 247 #else
 248 #if defined(CONFIG_BOOTLOADER_FAMILY)
 249                 bootldr_family = (unsigned short) BOOTLDRFAMILY(
 250                         CONFIG_BOOTLOADER_FAMILY[0],
 251                         CONFIG_BOOTLOADER_FAMILY[1]);
 252 #else
 253 #error "Unknown Bootloader Family"
 254 #endif
 255 #endif
 256         }
 257
 258         pr_info("Bootloader Family = 0x%04X\n", bootldr_family);
 259
 260         switch (bootldr_family) {
 261         case BOOTLDRFAMILY('R', '1'):
 262                 platform_family = FAMILY_1500;
 263                 break;
 264         case BOOTLDRFAMILY('4', '4'):
 265                 platform_family = FAMILY_4500;
 266                 break;
 267         case BOOTLDRFAMILY('4', '6'):
 268                 platform_family = FAMILY_4600;
 269                 break;
 270         case BOOTLDRFAMILY('A', '1'):
 271                 platform_family = FAMILY_4600VZA;
 272                 break;
 273         case BOOTLDRFAMILY('8', '5'):
 274                 platform_family = FAMILY_8500;
 275                 break;
 276         case BOOTLDRFAMILY('R', '2'):
 277                 platform_family = FAMILY_8500RNG;
 278                 break;
 279         case BOOTLDRFAMILY('8', '6'):
 280                 platform_family = FAMILY_8600;
 281                 break;
 282         case BOOTLDRFAMILY('B', '1'):
 283                 platform_family = FAMILY_8600VZB;
 284                 break;
 285         case BOOTLDRFAMILY('E', '1'):
 286                 platform_family = FAMILY_1500VZE;
 287                 break;
 288         case BOOTLDRFAMILY('F', '1'):
 289                 platform_family = FAMILY_1500VZF;
 290                 break;
 291         default:
 292                 platform_family = -1;
 293         }
 294 }
 295
 296 unsigned int platform_get_family(void)
 297 {
 298         return platform_family;
 299 }
 300 EXPORT_SYMBOL(platform_get_family);
 301
 302 /*
 303  * \brief usb_eye_configure() for optimizing the USB eye on Calliope.
 304  *
 305  * \param     unsigned int value saved to the register.
 306  *
 307  * \return    none
 308  *
 309  */
 310 static void __init usb_eye_configure(unsigned int value)
 311 {
 312         asic_write(asic_read(crt_spare) | value, crt_spare);
 313 }
 314
 315 /*
 316  * platform_get_asic - determine the ASIC type.
 317  *
 318  * \param     none
 319  *
 320  * \return    ASIC type; ASIC_UNKNOWN if none
 321  *
 322  */
 323 enum asic_type platform_get_asic(void)
 324 {
 325         return asic;
 326 }
 327 EXPORT_SYMBOL(platform_get_asic);
 328
 329 /*
 330  * platform_configure_usb - usb configuration based on platform type.
 331  * @bcm1_usb2_ctl:      value for the BCM1_USB2_CTL register, which is
 332  *                      quirky
 333  */
 334 static void __init platform_configure_usb(void)
 335 {
 336         u32 bcm1_usb2_ctl;
 337
 338         if (usb_configured)
 339                 return;
 340
 341         switch (asic) {
 342         case ASIC_ZEUS:
 343         case ASIC_CRONUS:
 344         case ASIC_CRONUSLITE:
 345                 fs_update(0x0000, 0x11, 0x02, 0);
 346                 bcm1_usb2_ctl = 0x803;
 347                 break;
 348
 349         case ASIC_CALLIOPE:
 350                 fs_update(0x0000, 0x11, 0x02, 1);
 351
 352                 switch (platform_family) {
 353                 case FAMILY_1500VZE:
 354                         break;
 355
 356                 case FAMILY_1500VZF:
 357                         usb_eye_configure(0x003c0000);
 358                         break;
 359
 360                 default:
 361                         usb_eye_configure(0x00300000);
 362                         break;
 363                 }
 364
 365                 bcm1_usb2_ctl = 0x803;
 366                 break;
 367
 368         default:
 369                 pr_err("Unknown ASIC type: %d\n", asic);
 370                 break;
 371         }
 372
 373         /* turn on USB power */
 374         asic_write(0, usb2_strap);
 375         /* Enable all OHCI interrupts */
 376         asic_write(bcm1_usb2_ctl, usb2_control);
 377         /* USB2_STBUS_OBC store32/load32 */
 378         asic_write(3, usb2_stbus_obc);
 379         /* USB2_STBUS_MESS_SIZE 2 packets */
 380         asic_write(1, usb2_stbus_mess_size);
 381         /* USB2_STBUS_CHUNK_SIZE 2 packets */
 382         asic_write(1, usb2_stbus_chunk_size);
 383
 384         usb_configured = true;
 385 }
 386
 387 /*
 388  * Set up the USB EHCI interface
 389  */
 390 void platform_configure_usb_ehci()
 391 {
 392         platform_configure_usb();
 393 }
 394
 395 /*
 396  * Set up the USB OHCI interface
 397  */
 398 void platform_configure_usb_ohci()
 399 {
 400         platform_configure_usb();
 401 }
 402
 403 /*
 404  * Shut the USB EHCI interface down--currently a NOP
 405  */
 406 void platform_unconfigure_usb_ehci()
 407 {
 408 }
 409
 410 /*
 411  * Shut the USB OHCI interface down--currently a NOP
 412  */
 413 void platform_unconfigure_usb_ohci()
 414 {
 415 }
 416
 417 static void __init set_register_map(unsigned long phys_base,
 418         const struct register_map *map)
 419 {
 420         asic_phy_base = phys_base;
 421         _asic_register_map = *map;
 422         register_map_virtualize(&_asic_register_map);
 423         asic_base = (unsigned long)ioremap_nocache(phys_base, ASIC_IO_SIZE);
 424 }
 425
 426 /**
 427  * configure_platform - configuration based on platform type.
 428  */
 429 void __init configure_platform(void)
 430 {
 431         platform_set_family();
 432
 433         switch (platform_family) {
 434         case FAMILY_1500:
 435         case FAMILY_1500VZE:
 436         case FAMILY_1500VZF:
 437                 platform_features = FFS_CAPABLE;
 438                 asic = ASIC_CALLIOPE;
 439                 set_register_map(CALLIOPE_IO_BASE, &calliope_register_map);
 440
 441                 if (platform_family == FAMILY_1500VZE) {
 442                         gp_resources = non_dvr_vze_calliope_resources;
 443                         pr_info("Platform: 1500/Vz Class E - "
 444                                 "CALLIOPE, NON_DVR_CAPABLE\n");
 445                 } else if (platform_family == FAMILY_1500VZF) {
 446                         gp_resources = non_dvr_vzf_calliope_resources;
 447                         pr_info("Platform: 1500/Vz Class F - "
 448                                 "CALLIOPE, NON_DVR_CAPABLE\n");
 449                 } else {
 450                         gp_resources = non_dvr_calliope_resources;
 451                         pr_info("Platform: 1500/RNG100 - CALLIOPE, "
 452                                 "NON_DVR_CAPABLE\n");
 453                 }
 454                 break;
 455
 456         case FAMILY_4500:
 457                 platform_features = FFS_CAPABLE | PCIE_CAPABLE |
 458                         DISPLAY_CAPABLE;
 459                 asic = ASIC_ZEUS;
 460                 set_register_map(ZEUS_IO_BASE, &zeus_register_map);
 461                 gp_resources = non_dvr_zeus_resources;
 462
 463                 pr_info("Platform: 4500 - ZEUS, NON_DVR_CAPABLE\n");
 464                 break;
 465
 466         case FAMILY_4600:
 467         {
 468                 unsigned int chipversion = 0;
 469
 470                 /* The settop has PCIE but it isn't used, so don't advertise
 471                  * it*/
 472                 platform_features = FFS_CAPABLE | DISPLAY_CAPABLE;
 473
 474                 /* ASIC version will determine if this is a real CronusLite or
 475                  * Castrati(Cronus) */
 476                 chipversion  = asic_read(chipver3) << 24;
 477                 chipversion |= asic_read(chipver2) << 16;
 478                 chipversion |= asic_read(chipver1) << 8;
 479                 chipversion |= asic_read(chipver0);
 480
 481                 if ((chipversion == CRONUS_10) || (chipversion == CRONUS_11))
 482                         asic = ASIC_CRONUS;
 483                 else
 484                         asic = ASIC_CRONUSLITE;
 485
 486                 /* Cronus and Cronus Lite have the same register map */
 487                 set_register_map(CRONUS_IO_BASE, &cronus_register_map);
 488                 gp_resources = non_dvr_cronuslite_resources;
 489                 pr_info("Platform: 4600 - %s, NON_DVR_CAPABLE, "
 490                         "chipversion=0x%08X\n",
 491                         (asic == ASIC_CRONUS) ? "CRONUS" : "CRONUS LITE",
 492                         chipversion);
 493                 break;
 494         }
 495         case FAMILY_4600VZA:
 496                 platform_features = FFS_CAPABLE | DISPLAY_CAPABLE;
 497                 asic = ASIC_CRONUS;
 498                 set_register_map(CRONUS_IO_BASE, &cronus_register_map);
 499                 gp_resources = non_dvr_cronus_resources;
 500
 501                 pr_info("Platform: Vz Class A - CRONUS, NON_DVR_CAPABLE\n");
 502                 break;
 503
 504         case FAMILY_8500:
 505         case FAMILY_8500RNG:
 506                 platform_features = DVR_CAPABLE | PCIE_CAPABLE |
 507                         DISPLAY_CAPABLE;
 508                 asic = ASIC_ZEUS;
 509                 set_register_map(ZEUS_IO_BASE, &zeus_register_map);
 510                 gp_resources = dvr_zeus_resources;
 511
 512                 pr_info("Platform: 8500/RNG200 - ZEUS, DVR_CAPABLE\n");
 513                 break;
 514
 515         case FAMILY_8600:
 516         case FAMILY_8600VZB:
 517                 platform_features = DVR_CAPABLE | PCIE_CAPABLE |
 518                         DISPLAY_CAPABLE;
 519                 asic = ASIC_CRONUS;
 520                 set_register_map(CRONUS_IO_BASE, &cronus_register_map);
 521                 gp_resources = dvr_cronus_resources;
 522
 523                 pr_info("Platform: 8600/Vz Class B - CRONUS, "
 524                         "DVR_CAPABLE\n");
 525                 break;
 526
 527         default:
 528                 pr_crit("Platform:  UNKNOWN PLATFORM\n");
 529                 break;
 530         }
 531
 532         switch (asic) {
 533         case ASIC_ZEUS:
 534                 phys_to_bus_offset = 0x30000000;
 535                 break;
 536         case ASIC_CALLIOPE:
 537                 phys_to_bus_offset = 0x10000000;
 538                 break;
 539         case ASIC_CRONUSLITE:
 540                 /* Fall through */
 541         case ASIC_CRONUS:
 542                 /*
 543                  * TODO: We suppose 0x10000000 aliases into 0x20000000-
 544                  * 0x2XXXXXXX. If 0x10000000 aliases into 0x60000000-
 545                  * 0x6XXXXXXX, the offset should be 0x50000000, not 0x10000000.
 546                  */
 547                 phys_to_bus_offset = 0x10000000;
 548                 break;
 549         default:
 550                 phys_to_bus_offset = 0x00000000;
 551                 break;
 552         }
 553 }
 554
 555 /**
 556  * platform_devices_init - sets up USB device resourse.
 557  */
 558 static int __init platform_devices_init(void)
 559 {
 560         pr_notice("%s: ----- Initializing USB resources -----\n", __func__);
 561
 562         asic_resource.start = asic_phy_base;
 563         asic_resource.end += asic_resource.start;
 564
 565         ehci_resources[0].start = asic_reg_phys_addr(ehci_hcapbase);
 566         ehci_resources[0].end += ehci_resources[0].start;
 567
 568         ohci_resources[0].start = asic_reg_phys_addr(ohci_hc_revision);
 569         ohci_resources[0].end += ohci_resources[0].start;
 570
 571         set_io_port_base(0);
 572
 573         platform_add_devices(platform_devices, ARRAY_SIZE(platform_devices));
 574
 575         return 0;
 576 }
 577
 578 arch_initcall(platform_devices_init);
 579
 580 /*
 581  *
 582  * BOOTMEM ALLOCATION
 583  *
 584  */
 585 /*
 586  * Allocates/reserves the Platform memory resources early in the boot process.
 587  * This ignores any resources that are designated IORESOURCE_IO
 588  */
 589 void __init platform_alloc_bootmem(void)
 590 {
 591         int i;
 592         int total = 0;
 593
 594         /* Get persistent memory data from command line before allocating
 595          * resources. This need to happen before normal command line parsing
 596          * has been done */
 597         pmem_setup_resource();
 598
 599         /* Loop through looking for resources that want a particular address */
 600         for (i = 0; gp_resources[i].flags != 0; i++) {
 601                 int size = gp_resources[i].end - gp_resources[i].start + 1;
 602                 if ((gp_resources[i].start != 0) &&
 603                         ((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
 604                         reserve_bootmem(bus_to_phys(gp_resources[i].start),
 605                                 size, 0);
 606                         total += gp_resources[i].end -
 607                                 gp_resources[i].start + 1;
 608                         pr_info("reserve resource %s at %08x (%u bytes)\n",
 609                                 gp_resources[i].name, gp_resources[i].start,
 610                                 gp_resources[i].end -
 611                                         gp_resources[i].start + 1);
 612                 }
 613         }
 614
 615         /* Loop through assigning addresses for those that are left */
 616         for (i = 0; gp_resources[i].flags != 0; i++) {
 617                 int size = gp_resources[i].end - gp_resources[i].start + 1;
 618                 if ((gp_resources[i].start == 0) &&
 619                         ((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
 620                         void *mem = alloc_bootmem_pages(size);
 621
 622                         if (mem == NULL)
 623                                 pr_err("Unable to allocate bootmem pages "
 624                                         "for %s\n", gp_resources[i].name);
 625
 626                         else {
 627                                 gp_resources[i].start =
 628                                         phys_to_bus(virt_to_phys(mem));
 629                                 gp_resources[i].end =
 630                                         gp_resources[i].start + size - 1;
 631                                 total += size;
 632                                 pr_info("allocate resource %s at %08x "
 633                                                 "(%u bytes)\n",
 634                                         gp_resources[i].name,
 635                                         gp_resources[i].start, size);
 636                         }
 637                 }
 638         }
 639
 640         pr_info("Total Platform driver memory allocation: 0x%08x\n", total);
 641
 642         /* indicate resources that are platform I/O related */
 643         for (i = 0; gp_resources[i].flags != 0; i++) {
 644                 if ((gp_resources[i].start != 0) &&
 645                         ((gp_resources[i].flags & IORESOURCE_IO) != 0)) {
 646                         pr_info("reserved platform resource %s at %08x\n",
 647                                 gp_resources[i].name, gp_resources[i].start);
 648                 }
 649         }
 650 }
 651
 652 /*
 653  *
 654  * PERSISTENT MEMORY (PMEM) CONFIGURATION
 655  *
 656  */
 657 static unsigned long pmemaddr __initdata;
 658
 659 static int __init early_param_pmemaddr(char *p)
 660 {
 661         pmemaddr = (unsigned long)simple_strtoul(p, NULL, 0);
 662         return 0;
 663 }
 664 early_param("pmemaddr", early_param_pmemaddr);
 665
 666 static long pmemlen __initdata;
 667
 668 static int __init early_param_pmemlen(char *p)
 669 {
 670 /* TODO: we can use this code when and if the bootloader ever changes this */
 671 #if 0
 672         pmemlen = (unsigned long)simple_strtoul(p, NULL, 0);
 673 #else
 674         pmemlen = 0x20000;
 675 #endif
 676         return 0;
 677 }
 678 early_param("pmemlen", early_param_pmemlen);
 679
 680 /*
 681  * Set up persistent memory. If we were given values, we patch the array of
 682  * resources. Otherwise, persistent memory may be allocated anywhere at all.
 683  */
 684 static void __init pmem_setup_resource(void)
 685 {
 686         struct resource *resource;
 687         resource = asic_resource_get("DiagPersistentMemory");
 688
 689         if (resource && pmemaddr && pmemlen) {
 690                 /* The address provided by bootloader is in kseg0. Convert to
 691                  * a bus address. */
 692                 resource->start = phys_to_bus(pmemaddr - 0x80000000);
 693                 resource->end = resource->start + pmemlen - 1;
 694
 695                 pr_info("persistent memory: start=0x%x  end=0x%x\n",
 696                         resource->start, resource->end);
 697         }
 698 }
 699
 700 /*
 701  *
 702  * RESOURCE ACCESS FUNCTIONS
 703  *
 704  */
 705
 706 /**
 707  * asic_resource_get - retrieves parameters for a platform resource.
 708  * @name:       string to match resource
 709  *
 710  * Returns a pointer to a struct resource corresponding to the given name.
 711  *
 712  * CANNOT BE NAMED platform_resource_get, which would be the obvious choice,
 713  * as this function name is already declared
 714  */
 715 struct resource *asic_resource_get(const char *name)
 716 {
 717         int i;
 718
 719         for (i = 0; gp_resources[i].flags != 0; i++) {
 720                 if (strcmp(gp_resources[i].name, name) == 0)
 721                         return &gp_resources[i];
 722         }
 723
 724         return NULL;
 725 }
 726 EXPORT_SYMBOL(asic_resource_get);
 727
 728 /**
 729  * platform_release_memory - release pre-allocated memory
 730  * @ptr:        pointer to memory to release
 731  * @size:       size of resource
 732  *
 733  * This must only be called for memory allocated or reserved via the boot
 734  * memory allocator.
 735  */
 736 void platform_release_memory(void *ptr, int size)
 737 {
 738         unsigned long addr;
 739         unsigned long end;
 740
 741         addr = ((unsigned long)ptr + (PAGE_SIZE - 1)) & PAGE_MASK;
 742         end = ((unsigned long)ptr + size) & PAGE_MASK;
 743
 744         for (; addr < end; addr += PAGE_SIZE) {
 745                 ClearPageReserved(virt_to_page(__va(addr)));
 746                 init_page_count(virt_to_page(__va(addr)));
 747                 free_page((unsigned long)__va(addr));
 748         }
 749 }
 750 EXPORT_SYMBOL(platform_release_memory);
 751
 752 /*
 753  *
 754  * FEATURE AVAILABILITY FUNCTIONS
 755  *
 756  */
 757 int platform_supports_dvr(void)
 758 {
 759         return (platform_features & DVR_CAPABLE) != 0;
 760 }
 761
 762 int platform_supports_ffs(void)
 763 {
 764         return (platform_features & FFS_CAPABLE) != 0;
 765 }
 766
 767 int platform_supports_pcie(void)
 768 {
 769         return (platform_features & PCIE_CAPABLE) != 0;
 770 }
 771
 772 int platform_supports_display(void)
 773 {
 774         return (platform_features & DISPLAY_CAPABLE) != 0;
 775 }