arch/mips/cavium-octeon/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2004-2007 Cavium Networks
   7  * Copyright (C) 2008, 2009 Wind River Systems
   8  *   written by Ralf Baechle <ralf@linux-mips.org>
   9  */
  10 #include <linux/compiler.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/console.h>
  15 #include <linux/delay.h>
  16 #include <linux/export.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/serial.h>
  20 #include <linux/smp.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>       /* for memset */
  23 #include <linux/tty.h>
  24 #include <linux/time.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/serial_core.h>
  27 #include <linux/serial_8250.h>
  28 #include <linux/of_fdt.h>
  29 #include <linux/libfdt.h>
  30 #include <linux/kexec.h>
  31
  32 #include <asm/processor.h>
  33 #include <asm/reboot.h>
  34 #include <asm/smp-ops.h>
  35 #include <asm/irq_cpu.h>
  36 #include <asm/mipsregs.h>
  37 #include <asm/bootinfo.h>
  38 #include <asm/sections.h>
  39 #include <asm/time.h>
  40
  41 #include <asm/octeon/octeon.h>
  42 #include <asm/octeon/pci-octeon.h>
  43 #include <asm/octeon/cvmx-mio-defs.h>
  44 #include <asm/octeon/cvmx-rst-defs.h>
  45
  46 extern struct plat_smp_ops octeon_smp_ops;
  47
  48 #ifdef CONFIG_PCI
  49 extern void pci_console_init(const char *arg);
  50 #endif
  51
  52 static unsigned long long MAX_MEMORY = 512ull << 20;
  53
  54 DEFINE_SEMAPHORE(octeon_bootbus_sem);
  55 EXPORT_SYMBOL(octeon_bootbus_sem);
  56
  57 struct octeon_boot_descriptor *octeon_boot_desc_ptr;
  58
  59 struct cvmx_bootinfo *octeon_bootinfo;
  60 EXPORT_SYMBOL(octeon_bootinfo);
  61
  62 static unsigned long long RESERVE_LOW_MEM = 0ull;
  63 #ifdef CONFIG_KEXEC
  64 #ifdef CONFIG_SMP
  65 /*
  66  * Wait for relocation code is prepared and send
  67  * secondary CPUs to spin until kernel is relocated.
  68  */
  69 static void octeon_kexec_smp_down(void *ignored)
  70 {
  71         int cpu = smp_processor_id();
  72
  73         local_irq_disable();
  74         set_cpu_online(cpu, false);
  75         while (!atomic_read(&kexec_ready_to_reboot))
  76                 cpu_relax();
  77
  78         asm volatile (
  79         "       sync                                            \n"
  80         "       synci   ($0)                                    \n");
  81
  82         relocated_kexec_smp_wait(NULL);
  83 }
  84 #endif
  85
  86 #define OCTEON_DDR0_BASE    (0x0ULL)
  87 #define OCTEON_DDR0_SIZE    (0x010000000ULL)
  88 #define OCTEON_DDR1_BASE    (0x410000000ULL)
  89 #define OCTEON_DDR1_SIZE    (0x010000000ULL)
  90 #define OCTEON_DDR2_BASE    (0x020000000ULL)
  91 #define OCTEON_DDR2_SIZE    (0x3e0000000ULL)
  92 #define OCTEON_MAX_PHY_MEM_SIZE (16*1024*1024*1024ULL)
  93
  94 static struct kimage *kimage_ptr;
  95
  96 static void kexec_bootmem_init(uint64_t mem_size, uint32_t low_reserved_bytes)
  97 {
  98         int64_t addr;
  99         struct cvmx_bootmem_desc *bootmem_desc;
 100
 101         bootmem_desc = cvmx_bootmem_get_desc();
 102
 103         if (mem_size > OCTEON_MAX_PHY_MEM_SIZE) {
 104                 mem_size = OCTEON_MAX_PHY_MEM_SIZE;
 105                 pr_err("Error: requested memory too large,"
 106                        "truncating to maximum size\n");
 107         }
 108
 109         bootmem_desc->major_version = CVMX_BOOTMEM_DESC_MAJ_VER;
 110         bootmem_desc->minor_version = CVMX_BOOTMEM_DESC_MIN_VER;
 111
 112         addr = (OCTEON_DDR0_BASE + RESERVE_LOW_MEM + low_reserved_bytes);
 113         bootmem_desc->head_addr = 0;
 114
 115         if (mem_size <= OCTEON_DDR0_SIZE) {
 116                 __cvmx_bootmem_phy_free(addr,
 117                                 mem_size - RESERVE_LOW_MEM -
 118                                 low_reserved_bytes, 0);
 119                 return;
 120         }
 121
 122         __cvmx_bootmem_phy_free(addr,
 123                         OCTEON_DDR0_SIZE - RESERVE_LOW_MEM -
 124                         low_reserved_bytes, 0);
 125
 126         mem_size -= OCTEON_DDR0_SIZE;
 127
 128         if (mem_size > OCTEON_DDR1_SIZE) {
 129                 __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, OCTEON_DDR1_SIZE, 0);
 130                 __cvmx_bootmem_phy_free(OCTEON_DDR2_BASE,
 131                                 mem_size - OCTEON_DDR1_SIZE, 0);
 132         } else
 133                 __cvmx_bootmem_phy_free(OCTEON_DDR1_BASE, mem_size, 0);
 134 }
 135
 136 static int octeon_kexec_prepare(struct kimage *image)
 137 {
 138         int i;
 139         char *bootloader = "kexec";
 140
 141         octeon_boot_desc_ptr->argc = 0;
 142         for (i = 0; i < image->nr_segments; i++) {
 143                 if (!strncmp(bootloader, (char *)image->segment[i].buf,
 144                                 strlen(bootloader))) {
 145                         /*
 146                          * convert command line string to array
 147                          * of parameters (as bootloader does).
 148                          */
 149                         int argc = 0, offt;
 150                         char *str = (char *)image->segment[i].buf;
 151                         char *ptr = strchr(str, ' ');
 152                         while (ptr && (OCTEON_ARGV_MAX_ARGS > argc)) {
 153                                 *ptr = '\0';
 154                                 if (ptr[1] != ' ') {
 155                                         offt = (int)(ptr - str + 1);
 156                                         octeon_boot_desc_ptr->argv[argc] =
 157                                                 image->segment[i].mem + offt;
 158                                         argc++;
 159                                 }
 160                                 ptr = strchr(ptr + 1, ' ');
 161                         }
 162                         octeon_boot_desc_ptr->argc = argc;
 163                         break;
 164                 }
 165         }
 166
 167         /*
 168          * Information about segments will be needed during pre-boot memory
 169          * initialization.
 170          */
 171         kimage_ptr = image;
 172         return 0;
 173 }
 174
 175 static void octeon_generic_shutdown(void)
 176 {
 177         int i;
 178 #ifdef CONFIG_SMP
 179         int cpu;
 180 #endif
 181         struct cvmx_bootmem_desc *bootmem_desc;
 182         void *named_block_array_ptr;
 183
 184         bootmem_desc = cvmx_bootmem_get_desc();
 185         named_block_array_ptr =
 186                 cvmx_phys_to_ptr(bootmem_desc->named_block_array_addr);
 187
 188 #ifdef CONFIG_SMP
 189         /* disable watchdogs */
 190         for_each_online_cpu(cpu)
 191                 cvmx_write_csr(CVMX_CIU_WDOGX(cpu_logical_map(cpu)), 0);
 192 #else
 193         cvmx_write_csr(CVMX_CIU_WDOGX(cvmx_get_core_num()), 0);
 194 #endif
 195         if (kimage_ptr != kexec_crash_image) {
 196                 memset(named_block_array_ptr,
 197                         0x0,
 198                         CVMX_BOOTMEM_NUM_NAMED_BLOCKS *
 199                         sizeof(struct cvmx_bootmem_named_block_desc));
 200                 /*
 201                  * Mark all memory (except low 0x100000 bytes) as free.
 202                  * It is the same thing that bootloader does.
 203                  */
 204                 kexec_bootmem_init(octeon_bootinfo->dram_size*1024ULL*1024ULL,
 205                                 0x100000);
 206                 /*
 207                  * Allocate all segments to avoid their corruption during boot.
 208                  */
 209                 for (i = 0; i < kimage_ptr->nr_segments; i++)
 210                         cvmx_bootmem_alloc_address(
 211                                 kimage_ptr->segment[i].memsz + 2*PAGE_SIZE,
 212                                 kimage_ptr->segment[i].mem - PAGE_SIZE,
 213                                 PAGE_SIZE);
 214         } else {
 215                 /*
 216                  * Do not mark all memory as free. Free only named sections
 217                  * leaving the rest of memory unchanged.
 218                  */
 219                 struct cvmx_bootmem_named_block_desc *ptr =
 220                         (struct cvmx_bootmem_named_block_desc *)
 221                         named_block_array_ptr;
 222
 223                 for (i = 0; i < bootmem_desc->named_block_num_blocks; i++)
 224                         if (ptr[i].size)
 225                                 cvmx_bootmem_free_named(ptr[i].name);
 226         }
 227         kexec_args[2] = 1UL; /* running on octeon_main_processor */
 228         kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
 229 #ifdef CONFIG_SMP
 230         secondary_kexec_args[2] = 0UL; /* running on secondary cpu */
 231         secondary_kexec_args[3] = (unsigned long)octeon_boot_desc_ptr;
 232 #endif
 233 }
 234
 235 static void octeon_shutdown(void)
 236 {
 237         octeon_generic_shutdown();
 238 #ifdef CONFIG_SMP
 239         smp_call_function(octeon_kexec_smp_down, NULL, 0);
 240         smp_wmb();
 241         while (num_online_cpus() > 1) {
 242                 cpu_relax();
 243                 mdelay(1);
 244         }
 245 #endif
 246 }
 247
 248 static void octeon_crash_shutdown(struct pt_regs *regs)
 249 {
 250         octeon_generic_shutdown();
 251         default_machine_crash_shutdown(regs);
 252 }
 253
 254 #endif /* CONFIG_KEXEC */
 255
 256 #ifdef CONFIG_CAVIUM_RESERVE32
 257 uint64_t octeon_reserve32_memory;
 258 EXPORT_SYMBOL(octeon_reserve32_memory);
 259 #endif
 260
 261 #ifdef CONFIG_KEXEC
 262 /* crashkernel cmdline parameter is parsed _after_ memory setup
 263  * we also parse it here (workaround for EHB5200) */
 264 static uint64_t crashk_size, crashk_base;
 265 #endif
 266
 267 static int octeon_uart;
 268
 269 extern asmlinkage void handle_int(void);
 270
 271 /**
 272  * Return non zero if we are currently running in the Octeon simulator
 273  *
 274  * Returns
 275  */
 276 int octeon_is_simulation(void)
 277 {
 278         return octeon_bootinfo->board_type == CVMX_BOARD_TYPE_SIM;
 279 }
 280 EXPORT_SYMBOL(octeon_is_simulation);
 281
 282 /**
 283  * Return true if Octeon is in PCI Host mode. This means
 284  * Linux can control the PCI bus.
 285  *
 286  * Returns Non zero if Octeon in host mode.
 287  */
 288 int octeon_is_pci_host(void)
 289 {
 290 #ifdef CONFIG_PCI
 291         return octeon_bootinfo->config_flags & CVMX_BOOTINFO_CFG_FLAG_PCI_HOST;
 292 #else
 293         return 0;
 294 #endif
 295 }
 296
 297 /**
 298  * Get the clock rate of Octeon
 299  *
 300  * Returns Clock rate in HZ
 301  */
 302 uint64_t octeon_get_clock_rate(void)
 303 {
 304         struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get();
 305
 306         return sysinfo->cpu_clock_hz;
 307 }
 308 EXPORT_SYMBOL(octeon_get_clock_rate);
 309
 310 static u64 octeon_io_clock_rate;
 311
 312 u64 octeon_get_io_clock_rate(void)
 313 {
 314         return octeon_io_clock_rate;
 315 }
 316 EXPORT_SYMBOL(octeon_get_io_clock_rate);
 317
 318
 319 /**
 320  * Write to the LCD display connected to the bootbus. This display
 321  * exists on most Cavium evaluation boards. If it doesn't exist, then
 322  * this function doesn't do anything.
 323  *
 324  * @s:      String to write
 325  */
 326 void octeon_write_lcd(const char *s)
 327 {
 328         if (octeon_bootinfo->led_display_base_addr) {
 329                 void __iomem *lcd_address =
 330                         ioremap_nocache(octeon_bootinfo->led_display_base_addr,
 331                                         8);
 332                 int i;
 333                 for (i = 0; i < 8; i++, s++) {
 334                         if (*s)
 335                                 iowrite8(*s, lcd_address + i);
 336                         else
 337                                 iowrite8(' ', lcd_address + i);
 338                 }
 339                 iounmap(lcd_address);
 340         }
 341 }
 342
 343 /**
 344  * Return the console uart passed by the bootloader
 345  *
 346  * Returns uart   (0 or 1)
 347  */
 348 int octeon_get_boot_uart(void)
 349 {
 350         int uart;
 351 #ifdef CONFIG_CAVIUM_OCTEON_2ND_KERNEL
 352         uart = 1;
 353 #else
 354         uart = (octeon_boot_desc_ptr->flags & OCTEON_BL_FLAG_CONSOLE_UART1) ?
 355                 1 : 0;
 356 #endif
 357         return uart;
 358 }
 359
 360 /**
 361  * Get the coremask Linux was booted on.
 362  *
 363  * Returns Core mask
 364  */
 365 int octeon_get_boot_coremask(void)
 366 {
 367         return octeon_boot_desc_ptr->core_mask;
 368 }
 369
 370 /**
 371  * Check the hardware BIST results for a CPU
 372  */
 373 void octeon_check_cpu_bist(void)
 374 {
 375         const int coreid = cvmx_get_core_num();
 376         unsigned long long mask;
 377         unsigned long long bist_val;
 378
 379         /* Check BIST results for COP0 registers */
 380         mask = 0x1f00000000ull;
 381         bist_val = read_octeon_c0_icacheerr();
 382         if (bist_val & mask)
 383                 pr_err("Core%d BIST Failure: CacheErr(icache) = 0x%llx\n",
 384                        coreid, bist_val);
 385
 386         bist_val = read_octeon_c0_dcacheerr();
 387         if (bist_val & 1)
 388                 pr_err("Core%d L1 Dcache parity error: "
 389                        "CacheErr(dcache) = 0x%llx\n",
 390                        coreid, bist_val);
 391
 392         mask = 0xfc00000000000000ull;
 393         bist_val = read_c0_cvmmemctl();
 394         if (bist_val & mask)
 395                 pr_err("Core%d BIST Failure: COP0_CVM_MEM_CTL = 0x%llx\n",
 396                        coreid, bist_val);
 397
 398         write_octeon_c0_dcacheerr(0);
 399 }
 400
 401 /**
 402  * Reboot Octeon
 403  *
 404  * @command: Command to pass to the bootloader. Currently ignored.
 405  */
 406 static void octeon_restart(char *command)
 407 {
 408         /* Disable all watchdogs before soft reset. They don't get cleared */
 409 #ifdef CONFIG_SMP
 410         int cpu;
 411         for_each_online_cpu(cpu)
 412                 cvmx_write_csr(CVMX_CIU_WDOGX(cpu_logical_map(cpu)), 0);
 413 #else
 414         cvmx_write_csr(CVMX_CIU_WDOGX(cvmx_get_core_num()), 0);
 415 #endif
 416
 417         mb();
 418         while (1)
 419                 if (OCTEON_IS_OCTEON3())
 420                         cvmx_write_csr(CVMX_RST_SOFT_RST, 1);
 421                 else
 422                         cvmx_write_csr(CVMX_CIU_SOFT_RST, 1);
 423 }
 424
 425
 426 /**
 427  * Permanently stop a core.
 428  *
 429  * @arg: Ignored.
 430  */
 431 static void octeon_kill_core(void *arg)
 432 {
 433         if (octeon_is_simulation())
 434                 /* A break instruction causes the simulator stop a core */
 435                 asm volatile ("break" ::: "memory");
 436
 437         local_irq_disable();
 438         /* Disable watchdog on this core. */
 439         cvmx_write_csr(CVMX_CIU_WDOGX(cvmx_get_core_num()), 0);
 440         /* Spin in a low power mode. */
 441         while (true)
 442                 asm volatile ("wait" ::: "memory");
 443 }
 444
 445
 446 /**
 447  * Halt the system
 448  */
 449 static void octeon_halt(void)
 450 {
 451         smp_call_function(octeon_kill_core, NULL, 0);
 452
 453         switch (octeon_bootinfo->board_type) {
 454         case CVMX_BOARD_TYPE_NAO38:
 455                 /* Driving a 1 to GPIO 12 shuts off this board */
 456                 cvmx_write_csr(CVMX_GPIO_BIT_CFGX(12), 1);
 457                 cvmx_write_csr(CVMX_GPIO_TX_SET, 0x1000);
 458                 break;
 459         default:
 460                 octeon_write_lcd("PowerOff");
 461                 break;
 462         }
 463
 464         octeon_kill_core(NULL);
 465 }
 466
 467 static char __read_mostly octeon_system_type[80];
 468
 469 static int __init init_octeon_system_type(void)
 470 {
 471         snprintf(octeon_system_type, sizeof(octeon_system_type), "%s (%s)",
 472                 cvmx_board_type_to_string(octeon_bootinfo->board_type),
 473                 octeon_model_get_string(read_c0_prid()));
 474
 475         return 0;
 476 }
 477 early_initcall(init_octeon_system_type);
 478
 479 /**
 480  * Return a string representing the system type
 481  *
 482  * Returns
 483  */
 484 const char *octeon_board_type_string(void)
 485 {
 486         return octeon_system_type;
 487 }
 488
 489 const char *get_system_type(void)
 490         __attribute__ ((alias("octeon_board_type_string")));
 491
 492 void octeon_user_io_init(void)
 493 {
 494         union octeon_cvmemctl cvmmemctl;
 495         union cvmx_iob_fau_timeout fau_timeout;
 496         union cvmx_pow_nw_tim nm_tim;
 497
 498         /* Get the current settings for CP0_CVMMEMCTL_REG */
 499         cvmmemctl.u64 = read_c0_cvmmemctl();
 500         /* R/W If set, marked write-buffer entries time out the same
 501          * as as other entries; if clear, marked write-buffer entries
 502          * use the maximum timeout. */
 503         cvmmemctl.s.dismarkwblongto = 1;
 504         /* R/W If set, a merged store does not clear the write-buffer
 505          * entry timeout state. */
 506         cvmmemctl.s.dismrgclrwbto = 0;
 507         /* R/W Two bits that are the MSBs of the resultant CVMSEG LM
 508          * word location for an IOBDMA. The other 8 bits come from the
 509          * SCRADDR field of the IOBDMA. */
 510         cvmmemctl.s.iobdmascrmsb = 0;
 511         /* R/W If set, SYNCWS and SYNCS only order marked stores; if
 512          * clear, SYNCWS and SYNCS only order unmarked
 513          * stores. SYNCWSMARKED has no effect when DISSYNCWS is
 514          * set. */
 515         cvmmemctl.s.syncwsmarked = 0;
 516         /* R/W If set, SYNCWS acts as SYNCW and SYNCS acts as SYNC. */
 517         cvmmemctl.s.dissyncws = 0;
 518         /* R/W If set, no stall happens on write buffer full. */
 519         if (OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2))
 520                 cvmmemctl.s.diswbfst = 1;
 521         else
 522                 cvmmemctl.s.diswbfst = 0;
 523         /* R/W If set (and SX set), supervisor-level loads/stores can
 524          * use XKPHYS addresses with <48>==0 */
 525         cvmmemctl.s.xkmemenas = 0;
 526
 527         /* R/W If set (and UX set), user-level loads/stores can use
 528          * XKPHYS addresses with VA<48>==0 */
 529         cvmmemctl.s.xkmemenau = 0;
 530
 531         /* R/W If set (and SX set), supervisor-level loads/stores can
 532          * use XKPHYS addresses with VA<48>==1 */
 533         cvmmemctl.s.xkioenas = 0;
 534
 535         /* R/W If set (and UX set), user-level loads/stores can use
 536          * XKPHYS addresses with VA<48>==1 */
 537         cvmmemctl.s.xkioenau = 0;
 538
 539         /* R/W If set, all stores act as SYNCW (NOMERGE must be set
 540          * when this is set) RW, reset to 0. */
 541         cvmmemctl.s.allsyncw = 0;
 542
 543         /* R/W If set, no stores merge, and all stores reach the
 544          * coherent bus in order. */
 545         cvmmemctl.s.nomerge = 0;
 546         /* R/W Selects the bit in the counter used for DID time-outs 0
 547          * = 231, 1 = 230, 2 = 229, 3 = 214. Actual time-out is
 548          * between 1x and 2x this interval. For example, with
 549          * DIDTTO=3, expiration interval is between 16K and 32K. */
 550         cvmmemctl.s.didtto = 0;
 551         /* R/W If set, the (mem) CSR clock never turns off. */
 552         cvmmemctl.s.csrckalwys = 0;
 553         /* R/W If set, mclk never turns off. */
 554         cvmmemctl.s.mclkalwys = 0;
 555         /* R/W Selects the bit in the counter used for write buffer
 556          * flush time-outs (WBFLT+11) is the bit position in an
 557          * internal counter used to determine expiration. The write
 558          * buffer expires between 1x and 2x this interval. For
 559          * example, with WBFLT = 0, a write buffer expires between 2K
 560          * and 4K cycles after the write buffer entry is allocated. */
 561         cvmmemctl.s.wbfltime = 0;
 562         /* R/W If set, do not put Istream in the L2 cache. */
 563         cvmmemctl.s.istrnol2 = 0;
 564
 565         /*
 566          * R/W The write buffer threshold. As per erratum Core-14752
 567          * for CN63XX, a sc/scd might fail if the write buffer is
 568          * full.  Lowering WBTHRESH greatly lowers the chances of the
 569          * write buffer ever being full and triggering the erratum.
 570          */
 571         if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X))
 572                 cvmmemctl.s.wbthresh = 4;
 573         else
 574                 cvmmemctl.s.wbthresh = 10;
 575
 576         /* R/W If set, CVMSEG is available for loads/stores in
 577          * kernel/debug mode. */
 578 #if CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0
 579         cvmmemctl.s.cvmsegenak = 1;
 580 #else
 581         cvmmemctl.s.cvmsegenak = 0;
 582 #endif
 583         /* R/W If set, CVMSEG is available for loads/stores in
 584          * supervisor mode. */
 585         cvmmemctl.s.cvmsegenas = 0;
 586         /* R/W If set, CVMSEG is available for loads/stores in user
 587          * mode. */
 588         cvmmemctl.s.cvmsegenau = 0;
 589
 590         write_c0_cvmmemctl(cvmmemctl.u64);
 591
 592         /* Setup of CVMSEG is done in kernel-entry-init.h */
 593         if (smp_processor_id() == 0)
 594                 pr_notice("CVMSEG size: %d cache lines (%d bytes)\n",
 595                           CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE,
 596                           CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE * 128);
 597
 598         /* Set a default for the hardware timeouts */
 599         fau_timeout.u64 = 0;
 600         fau_timeout.s.tout_val = 0xfff;
 601         /* Disable tagwait FAU timeout */
 602         fau_timeout.s.tout_enb = 0;
 603         cvmx_write_csr(CVMX_IOB_FAU_TIMEOUT, fau_timeout.u64);
 604
 605         nm_tim.u64 = 0;
 606         /* 4096 cycles */
 607         nm_tim.s.nw_tim = 3;
 608         cvmx_write_csr(CVMX_POW_NW_TIM, nm_tim.u64);
 609
 610         write_octeon_c0_icacheerr(0);
 611         write_c0_derraddr1(0);
 612 }
 613
 614 /**
 615  * Early entry point for arch setup
 616  */
 617 void __init prom_init(void)
 618 {
 619         struct cvmx_sysinfo *sysinfo;
 620         const char *arg;
 621         char *p;
 622         int i;
 623         u64 t;
 624         int argc;
 625 #ifdef CONFIG_CAVIUM_RESERVE32
 626         int64_t addr = -1;
 627 #endif
 628         /*
 629          * The bootloader passes a pointer to the boot descriptor in
 630          * $a3, this is available as fw_arg3.
 631          */
 632         octeon_boot_desc_ptr = (struct octeon_boot_descriptor *)fw_arg3;
 633         octeon_bootinfo =
 634                 cvmx_phys_to_ptr(octeon_boot_desc_ptr->cvmx_desc_vaddr);
 635         cvmx_bootmem_init(cvmx_phys_to_ptr(octeon_bootinfo->phy_mem_desc_addr));
 636
 637         sysinfo = cvmx_sysinfo_get();
 638         memset(sysinfo, 0, sizeof(*sysinfo));
 639         sysinfo->system_dram_size = octeon_bootinfo->dram_size << 20;
 640         sysinfo->phy_mem_desc_ptr =
 641                 cvmx_phys_to_ptr(octeon_bootinfo->phy_mem_desc_addr);
 642         sysinfo->core_mask = octeon_bootinfo->core_mask;
 643         sysinfo->exception_base_addr = octeon_bootinfo->exception_base_addr;
 644         sysinfo->cpu_clock_hz = octeon_bootinfo->eclock_hz;
 645         sysinfo->dram_data_rate_hz = octeon_bootinfo->dclock_hz * 2;
 646         sysinfo->board_type = octeon_bootinfo->board_type;
 647         sysinfo->board_rev_major = octeon_bootinfo->board_rev_major;
 648         sysinfo->board_rev_minor = octeon_bootinfo->board_rev_minor;
 649         memcpy(sysinfo->mac_addr_base, octeon_bootinfo->mac_addr_base,
 650                sizeof(sysinfo->mac_addr_base));
 651         sysinfo->mac_addr_count = octeon_bootinfo->mac_addr_count;
 652         memcpy(sysinfo->board_serial_number,
 653                octeon_bootinfo->board_serial_number,
 654                sizeof(sysinfo->board_serial_number));
 655         sysinfo->compact_flash_common_base_addr =
 656                 octeon_bootinfo->compact_flash_common_base_addr;
 657         sysinfo->compact_flash_attribute_base_addr =
 658                 octeon_bootinfo->compact_flash_attribute_base_addr;
 659         sysinfo->led_display_base_addr = octeon_bootinfo->led_display_base_addr;
 660         sysinfo->dfa_ref_clock_hz = octeon_bootinfo->dfa_ref_clock_hz;
 661         sysinfo->bootloader_config_flags = octeon_bootinfo->config_flags;
 662
 663         if (OCTEON_IS_OCTEON2()) {
 664                 /* I/O clock runs at a different rate than the CPU. */
 665                 union cvmx_mio_rst_boot rst_boot;
 666                 rst_boot.u64 = cvmx_read_csr(CVMX_MIO_RST_BOOT);
 667                 octeon_io_clock_rate = 50000000 * rst_boot.s.pnr_mul;
 668         } else if (OCTEON_IS_OCTEON3()) {
 669                 /* I/O clock runs at a different rate than the CPU. */
 670                 union cvmx_rst_boot rst_boot;
 671                 rst_boot.u64 = cvmx_read_csr(CVMX_RST_BOOT);
 672                 octeon_io_clock_rate = 50000000 * rst_boot.s.pnr_mul;
 673         } else {
 674                 octeon_io_clock_rate = sysinfo->cpu_clock_hz;
 675         }
 676
 677         t = read_c0_cvmctl();
 678         if ((t & (1ull << 27)) == 0) {
 679                 /*
 680                  * Setup the multiplier save/restore code if
 681                  * CvmCtl[NOMUL] clear.
 682                  */
 683                 void *save;
 684                 void *save_end;
 685                 void *restore;
 686                 void *restore_end;
 687                 int save_len;
 688                 int restore_len;
 689                 int save_max = (char *)octeon_mult_save_end -
 690                         (char *)octeon_mult_save;
 691                 int restore_max = (char *)octeon_mult_restore_end -
 692                         (char *)octeon_mult_restore;
 693                 if (current_cpu_data.cputype == CPU_CAVIUM_OCTEON3) {
 694                         save = octeon_mult_save3;
 695                         save_end = octeon_mult_save3_end;
 696                         restore = octeon_mult_restore3;
 697                         restore_end = octeon_mult_restore3_end;
 698                 } else {
 699                         save = octeon_mult_save2;
 700                         save_end = octeon_mult_save2_end;
 701                         restore = octeon_mult_restore2;
 702                         restore_end = octeon_mult_restore2_end;
 703                 }
 704                 save_len = (char *)save_end - (char *)save;
 705                 restore_len = (char *)restore_end - (char *)restore;
 706                 if (!WARN_ON(save_len > save_max ||
 707                                 restore_len > restore_max)) {
 708                         memcpy(octeon_mult_save, save, save_len);
 709                         memcpy(octeon_mult_restore, restore, restore_len);
 710                 }
 711         }
 712
 713         /*
 714          * Only enable the LED controller if we're running on a CN38XX, CN58XX,
 715          * or CN56XX. The CN30XX and CN31XX don't have an LED controller.
 716          */
 717         if (!octeon_is_simulation() &&
 718             octeon_has_feature(OCTEON_FEATURE_LED_CONTROLLER)) {
 719                 cvmx_write_csr(CVMX_LED_EN, 0);
 720                 cvmx_write_csr(CVMX_LED_PRT, 0);
 721                 cvmx_write_csr(CVMX_LED_DBG, 0);
 722                 cvmx_write_csr(CVMX_LED_PRT_FMT, 0);
 723                 cvmx_write_csr(CVMX_LED_UDD_CNTX(0), 32);
 724                 cvmx_write_csr(CVMX_LED_UDD_CNTX(1), 32);
 725                 cvmx_write_csr(CVMX_LED_UDD_DATX(0), 0);
 726                 cvmx_write_csr(CVMX_LED_UDD_DATX(1), 0);
 727                 cvmx_write_csr(CVMX_LED_EN, 1);
 728         }
 729 #ifdef CONFIG_CAVIUM_RESERVE32
 730         /*
 731          * We need to temporarily allocate all memory in the reserve32
 732          * region. This makes sure the kernel doesn't allocate this
 733          * memory when it is getting memory from the
 734          * bootloader. Later, after the memory allocations are
 735          * complete, the reserve32 will be freed.
 736          *
 737          * Allocate memory for RESERVED32 aligned on 2MB boundary. This
 738          * is in case we later use hugetlb entries with it.
 739          */
 740         addr = cvmx_bootmem_phy_named_block_alloc(CONFIG_CAVIUM_RESERVE32 << 20,
 741                                                 0, 0, 2 << 20,
 742                                                 "CAVIUM_RESERVE32", 0);
 743         if (addr < 0)
 744                 pr_err("Failed to allocate CAVIUM_RESERVE32 memory area\n");
 745         else
 746                 octeon_reserve32_memory = addr;
 747 #endif
 748
 749 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2
 750         if (cvmx_read_csr(CVMX_L2D_FUS3) & (3ull << 34)) {
 751                 pr_info("Skipping L2 locking due to reduced L2 cache size\n");
 752         } else {
 753                 uint32_t __maybe_unused ebase = read_c0_ebase() & 0x3ffff000;
 754 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2_TLB
 755                 /* TLB refill */
 756                 cvmx_l2c_lock_mem_region(ebase, 0x100);
 757 #endif
 758 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2_EXCEPTION
 759                 /* General exception */
 760                 cvmx_l2c_lock_mem_region(ebase + 0x180, 0x80);
 761 #endif
 762 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2_LOW_LEVEL_INTERRUPT
 763                 /* Interrupt handler */
 764                 cvmx_l2c_lock_mem_region(ebase + 0x200, 0x80);
 765 #endif
 766 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2_INTERRUPT
 767                 cvmx_l2c_lock_mem_region(__pa_symbol(handle_int), 0x100);
 768                 cvmx_l2c_lock_mem_region(__pa_symbol(plat_irq_dispatch), 0x80);
 769 #endif
 770 #ifdef CONFIG_CAVIUM_OCTEON_LOCK_L2_MEMCPY
 771                 cvmx_l2c_lock_mem_region(__pa_symbol(memcpy), 0x480);
 772 #endif
 773         }
 774 #endif
 775
 776         octeon_check_cpu_bist();
 777
 778         octeon_uart = octeon_get_boot_uart();
 779
 780 #ifdef CONFIG_SMP
 781         octeon_write_lcd("LinuxSMP");
 782 #else
 783         octeon_write_lcd("Linux");
 784 #endif
 785
 786         octeon_setup_delays();
 787
 788         /*
 789          * BIST should always be enabled when doing a soft reset. L2
 790          * Cache locking for instance is not cleared unless BIST is
 791          * enabled.  Unfortunately due to a chip errata G-200 for
 792          * Cn38XX and CN31XX, BIST msut be disabled on these parts.
 793          */
 794         if (OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) ||
 795             OCTEON_IS_MODEL(OCTEON_CN31XX))
 796                 cvmx_write_csr(CVMX_CIU_SOFT_BIST, 0);
 797         else
 798                 cvmx_write_csr(CVMX_CIU_SOFT_BIST, 1);
 799
 800         /* Default to 64MB in the simulator to speed things up */
 801         if (octeon_is_simulation())
 802                 MAX_MEMORY = 64ull << 20;
 803
 804         arg = strstr(arcs_cmdline, "mem=");
 805         if (arg) {
 806                 MAX_MEMORY = memparse(arg + 4, &p);
 807                 if (MAX_MEMORY == 0)
 808                         MAX_MEMORY = 32ull << 30;
 809                 if (*p == '@')
 810                         RESERVE_LOW_MEM = memparse(p + 1, &p);
 811         }
 812
 813         arcs_cmdline[0] = 0;
 814         argc = octeon_boot_desc_ptr->argc;
 815         for (i = 0; i < argc; i++) {
 816                 const char *arg =
 817                         cvmx_phys_to_ptr(octeon_boot_desc_ptr->argv[i]);
 818                 if ((strncmp(arg, "MEM=", 4) == 0) ||
 819                     (strncmp(arg, "mem=", 4) == 0)) {
 820                         MAX_MEMORY = memparse(arg + 4, &p);
 821                         if (MAX_MEMORY == 0)
 822                                 MAX_MEMORY = 32ull << 30;
 823                         if (*p == '@')
 824                                 RESERVE_LOW_MEM = memparse(p + 1, &p);
 825 #ifdef CONFIG_KEXEC
 826                 } else if (strncmp(arg, "crashkernel=", 12) == 0) {
 827                         crashk_size = memparse(arg+12, &p);
 828                         if (*p == '@')
 829                                 crashk_base = memparse(p+1, &p);
 830                         strcat(arcs_cmdline, " ");
 831                         strcat(arcs_cmdline, arg);
 832                         /*
 833                          * To do: switch parsing to new style, something like:
 834                          * parse_crashkernel(arg, sysinfo->system_dram_size,
 835                          *                &crashk_size, &crashk_base);
 836                          */
 837 #endif
 838                 } else if (strlen(arcs_cmdline) + strlen(arg) + 1 <
 839                            sizeof(arcs_cmdline) - 1) {
 840                         strcat(arcs_cmdline, " ");
 841                         strcat(arcs_cmdline, arg);
 842                 }
 843         }
 844
 845         if (strstr(arcs_cmdline, "console=") == NULL) {
 846 #ifdef CONFIG_CAVIUM_OCTEON_2ND_KERNEL
 847                 strcat(arcs_cmdline, " console=ttyS0,115200");
 848 #else
 849                 if (octeon_uart == 1)
 850                         strcat(arcs_cmdline, " console=ttyS1,115200");
 851                 else
 852                         strcat(arcs_cmdline, " console=ttyS0,115200");
 853 #endif
 854         }
 855
 856         mips_hpt_frequency = octeon_get_clock_rate();
 857
 858         octeon_init_cvmcount();
 859
 860         _machine_restart = octeon_restart;
 861         _machine_halt = octeon_halt;
 862
 863 #ifdef CONFIG_KEXEC
 864         _machine_kexec_shutdown = octeon_shutdown;
 865         _machine_crash_shutdown = octeon_crash_shutdown;
 866         _machine_kexec_prepare = octeon_kexec_prepare;
 867 #endif
 868
 869         octeon_user_io_init();
 870         register_smp_ops(&octeon_smp_ops);
 871 }
 872
 873 /* Exclude a single page from the regions obtained in plat_mem_setup. */
 874 #ifndef CONFIG_CRASH_DUMP
 875 static __init void memory_exclude_page(u64 addr, u64 *mem, u64 *size)
 876 {
 877         if (addr > *mem && addr < *mem + *size) {
 878                 u64 inc = addr - *mem;
 879                 add_memory_region(*mem, inc, BOOT_MEM_RAM);
 880                 *mem += inc;
 881                 *size -= inc;
 882         }
 883
 884         if (addr == *mem && *size > PAGE_SIZE) {
 885                 *mem += PAGE_SIZE;
 886                 *size -= PAGE_SIZE;
 887         }
 888 }
 889 #endif /* CONFIG_CRASH_DUMP */
 890
 891 void __init plat_mem_setup(void)
 892 {
 893         uint64_t mem_alloc_size;
 894         uint64_t total;
 895         uint64_t crashk_end;
 896 #ifndef CONFIG_CRASH_DUMP
 897         int64_t memory;
 898         uint64_t kernel_start;
 899         uint64_t kernel_size;
 900 #endif
 901
 902         total = 0;
 903         crashk_end = 0;
 904
 905         /*
 906          * The Mips memory init uses the first memory location for
 907          * some memory vectors. When SPARSEMEM is in use, it doesn't
 908          * verify that the size is big enough for the final
 909          * vectors. Making the smallest chuck 4MB seems to be enough
 910          * to consistently work.
 911          */
 912         mem_alloc_size = 4 << 20;
 913         if (mem_alloc_size > MAX_MEMORY)
 914                 mem_alloc_size = MAX_MEMORY;
 915
 916 /* Crashkernel ignores bootmem list. It relies on mem=X@Y option */
 917 #ifdef CONFIG_CRASH_DUMP
 918         add_memory_region(RESERVE_LOW_MEM, MAX_MEMORY, BOOT_MEM_RAM);
 919         total += MAX_MEMORY;
 920 #else
 921 #ifdef CONFIG_KEXEC
 922         if (crashk_size > 0) {
 923                 add_memory_region(crashk_base, crashk_size, BOOT_MEM_RAM);
 924                 crashk_end = crashk_base + crashk_size;
 925         }
 926 #endif
 927         /*
 928          * When allocating memory, we want incrementing addresses from
 929          * bootmem_alloc so the code in add_memory_region can merge
 930          * regions next to each other.
 931          */
 932         cvmx_bootmem_lock();
 933         while ((boot_mem_map.nr_map < BOOT_MEM_MAP_MAX)
 934                 && (total < MAX_MEMORY)) {
 935                 memory = cvmx_bootmem_phy_alloc(mem_alloc_size,
 936                                                 __pa_symbol(&_end), -1,
 937                                                 0x100000,
 938                                                 CVMX_BOOTMEM_FLAG_NO_LOCKING);
 939                 if (memory >= 0) {
 940                         u64 size = mem_alloc_size;
 941 #ifdef CONFIG_KEXEC
 942                         uint64_t end;
 943 #endif
 944
 945                         /*
 946                          * exclude a page at the beginning and end of
 947                          * the 256MB PCIe 'hole' so the kernel will not
 948                          * try to allocate multi-page buffers that
 949                          * span the discontinuity.
 950                          */
 951                         memory_exclude_page(CVMX_PCIE_BAR1_PHYS_BASE,
 952                                             &memory, &size);
 953                         memory_exclude_page(CVMX_PCIE_BAR1_PHYS_BASE +
 954                                             CVMX_PCIE_BAR1_PHYS_SIZE,
 955                                             &memory, &size);
 956 #ifdef CONFIG_KEXEC
 957                         end = memory + mem_alloc_size;
 958
 959                         /*
 960                          * This function automatically merges address regions
 961                          * next to each other if they are received in
 962                          * incrementing order
 963                          */
 964                         if (memory < crashk_base && end >  crashk_end) {
 965                                 /* region is fully in */
 966                                 add_memory_region(memory,
 967                                                   crashk_base - memory,
 968                                                   BOOT_MEM_RAM);
 969                                 total += crashk_base - memory;
 970                                 add_memory_region(crashk_end,
 971                                                   end - crashk_end,
 972                                                   BOOT_MEM_RAM);
 973                                 total += end - crashk_end;
 974                                 continue;
 975                         }
 976
 977                         if (memory >= crashk_base && end <= crashk_end)
 978                                 /*
 979                                  * Entire memory region is within the new
 980                                  *  kernel's memory, ignore it.
 981                                  */
 982                                 continue;
 983
 984                         if (memory > crashk_base && memory < crashk_end &&
 985                             end > crashk_end) {
 986                                 /*
 987                                  * Overlap with the beginning of the region,
 988                                  * reserve the beginning.
 989                                   */
 990                                 mem_alloc_size -= crashk_end - memory;
 991                                 memory = crashk_end;
 992                         } else if (memory < crashk_base && end > crashk_base &&
 993                                    end < crashk_end)
 994                                 /*
 995                                  * Overlap with the beginning of the region,
 996                                  * chop of end.
 997                                  */
 998                                 mem_alloc_size -= end - crashk_base;
 999 #endif
1000                         add_memory_region(memory, mem_alloc_size, BOOT_MEM_RAM);
1001                         total += mem_alloc_size;
1002                         /* Recovering mem_alloc_size */
1003                         mem_alloc_size = 4 << 20;
1004                 } else {
1005                         break;
1006                 }
1007         }
1008         cvmx_bootmem_unlock();
1009         /* Add the memory region for the kernel. */
1010         kernel_start = (unsigned long) _text;
1011         kernel_size = _end - _text;
1012
1013         /* Adjust for physical offset. */
1014         kernel_start &= ~0xffffffff80000000ULL;
1015         add_memory_region(kernel_start, kernel_size, BOOT_MEM_RAM);
1016 #endif /* CONFIG_CRASH_DUMP */
1017
1018 #ifdef CONFIG_CAVIUM_RESERVE32
1019         /*
1020          * Now that we've allocated the kernel memory it is safe to
1021          * free the reserved region. We free it here so that builtin
1022          * drivers can use the memory.
1023          */
1024         if (octeon_reserve32_memory)
1025                 cvmx_bootmem_free_named("CAVIUM_RESERVE32");
1026 #endif /* CONFIG_CAVIUM_RESERVE32 */
1027
1028         if (total == 0)
1029                 panic("Unable to allocate memory from "
1030                       "cvmx_bootmem_phy_alloc");
1031 }
1032
1033 /*
1034  * Emit one character to the boot UART.  Exported for use by the
1035  * watchdog timer.
1036  */
1037 int prom_putchar(char c)
1038 {
1039         uint64_t lsrval;
1040
1041         /* Spin until there is room */
1042         do {
1043                 lsrval = cvmx_read_csr(CVMX_MIO_UARTX_LSR(octeon_uart));
1044         } while ((lsrval & 0x20) == 0);
1045
1046         /* Write the byte */
1047         cvmx_write_csr(CVMX_MIO_UARTX_THR(octeon_uart), c & 0xffull);
1048         return 1;
1049 }
1050 EXPORT_SYMBOL(prom_putchar);
1051
1052 void __init prom_free_prom_memory(void)
1053 {
1054         if (CAVIUM_OCTEON_DCACHE_PREFETCH_WAR) {
1055                 /* Check for presence of Core-14449 fix.  */
1056                 u32 insn;
1057                 u32 *foo;
1058
1059                 foo = &insn;
1060
1061                 asm volatile("# before" : : : "memory");
1062                 prefetch(foo);
1063                 asm volatile(
1064                         ".set push\n\t"
1065                         ".set noreorder\n\t"
1066                         "bal 1f\n\t"
1067                         "nop\n"
1068                         "1:\tlw %0,-12($31)\n\t"
1069                         ".set pop\n\t"
1070                         : "=r" (insn) : : "$31", "memory");
1071
1072                 if ((insn >> 26) != 0x33)
1073                         panic("No PREF instruction at Core-14449 probe point.");
1074
1075                 if (((insn >> 16) & 0x1f) != 28)
1076                         panic("OCTEON II DCache prefetch workaround not in place (%04x).\n"
1077                               "Please build kernel with proper options (CONFIG_CAVIUM_CN63XXP1).",
1078                               insn);
1079         }
1080 }
1081
1082 int octeon_prune_device_tree(void);
1083
1084 extern const char __dtb_octeon_3xxx_begin;
1085 extern const char __dtb_octeon_68xx_begin;
1086 void __init device_tree_init(void)
1087 {
1088         const void *fdt;
1089         bool do_prune;
1090
1091         if (octeon_bootinfo->minor_version >= 3 && octeon_bootinfo->fdt_addr) {
1092                 fdt = phys_to_virt(octeon_bootinfo->fdt_addr);
1093                 if (fdt_check_header(fdt))
1094                         panic("Corrupt Device Tree passed to kernel.");
1095                 do_prune = false;
1096         } else if (OCTEON_IS_MODEL(OCTEON_CN68XX)) {
1097                 fdt = &__dtb_octeon_68xx_begin;
1098                 do_prune = true;
1099         } else {
1100                 fdt = &__dtb_octeon_3xxx_begin;
1101                 do_prune = true;
1102         }
1103
1104         initial_boot_params = (void *)fdt;
1105
1106         if (do_prune) {
1107                 octeon_prune_device_tree();
1108                 pr_info("Using internal Device Tree.\n");
1109         } else {
1110                 pr_info("Using passed Device Tree.\n");
1111         }
1112         unflatten_and_copy_device_tree();
1113 }
1114
1115 static int __initdata disable_octeon_edac_p;
1116
1117 static int __init disable_octeon_edac(char *str)
1118 {
1119         disable_octeon_edac_p = 1;
1120         return 0;
1121 }
1122 early_param("disable_octeon_edac", disable_octeon_edac);
1123
1124 static char *edac_device_names[] = {
1125         "octeon_l2c_edac",
1126         "octeon_pc_edac",
1127 };
1128
1129 static int __init edac_devinit(void)
1130 {
1131         struct platform_device *dev;
1132         int i, err = 0;
1133         int num_lmc;
1134         char *name;
1135
1136         if (disable_octeon_edac_p)
1137                 return 0;
1138
1139         for (i = 0; i < ARRAY_SIZE(edac_device_names); i++) {
1140                 name = edac_device_names[i];
1141                 dev = platform_device_register_simple(name, -1, NULL, 0);
1142                 if (IS_ERR(dev)) {
1143                         pr_err("Registration of %s failed!\n", name);
1144                         err = PTR_ERR(dev);
1145                 }
1146         }
1147
1148         num_lmc = OCTEON_IS_MODEL(OCTEON_CN68XX) ? 4 :
1149                 (OCTEON_IS_MODEL(OCTEON_CN56XX) ? 2 : 1);
1150         for (i = 0; i < num_lmc; i++) {
1151                 dev = platform_device_register_simple("octeon_lmc_edac",
1152                                                       i, NULL, 0);
1153                 if (IS_ERR(dev)) {
1154                         pr_err("Registration of octeon_lmc_edac %d failed!\n", i);
1155                         err = PTR_ERR(dev);
1156                 }
1157         }
1158
1159         return err;
1160 }
1161 device_initcall(edac_devinit);
1162
1163 static void __initdata *octeon_dummy_iospace;
1164
1165 static int __init octeon_no_pci_init(void)
1166 {
1167         /*
1168          * Initially assume there is no PCI. The PCI/PCIe platform code will
1169          * later re-initialize these to correct values if they are present.
1170          */
1171         octeon_dummy_iospace = vzalloc(IO_SPACE_LIMIT);
1172         set_io_port_base((unsigned long)octeon_dummy_iospace);
1173         ioport_resource.start = MAX_RESOURCE;
1174         ioport_resource.end = 0;
1175         return 0;
1176 }
1177 core_initcall(octeon_no_pci_init);
1178
1179 static int __init octeon_no_pci_release(void)
1180 {
1181         /*
1182          * Release the allocated memory if a real IO space is there.
1183          */
1184         if ((unsigned long)octeon_dummy_iospace != mips_io_port_base)
1185                 vfree(octeon_dummy_iospace);
1186         return 0;
1187 }
1188 late_initcall(octeon_no_pci_release);