arch/xtensa/kernel/setup.c

   1 /*
   2  * arch/xtensa/kernel/setup.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995  Linus Torvalds
   9  * Copyright (C) 2001 - 2005  Tensilica Inc.
  10  * Copyright (C) 2014 - 2016  Cadence Design Systems Inc.
  11  *
  12  * Chris Zankel <[email protected]>
  13  * Joe Taylor   <[email protected], [email protected]>
  14  * Kevin Chea
  15  * Marc Gauthier<[email protected]> <[email protected]>
  16  */
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/screen_info.h>
  23 #include <linux/kernel.h>
  24 #include <linux/percpu.h>
  25 #include <linux/cpu.h>
  26 #include <linux/of.h>
  27 #include <linux/of_fdt.h>
  28
  29 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  30 # include <linux/console.h>
  31 #endif
  32
  33 #ifdef CONFIG_PROC_FS
  34 # include <linux/seq_file.h>
  35 #endif
  36
  37 #include <asm/bootparam.h>
  38 #include <asm/kasan.h>
  39 #include <asm/mmu_context.h>
  40 #include <asm/page.h>
  41 #include <asm/param.h>
  42 #include <asm/platform.h>
  43 #include <asm/processor.h>
  44 #include <asm/sections.h>
  45 #include <asm/setup.h>
  46 #include <asm/smp.h>
  47 #include <asm/sysmem.h>
  48 #include <asm/timex.h>
  49
  50 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  51 struct screen_info screen_info = {
  52         .orig_x = 0,
  53         .orig_y = 24,
  54         .orig_video_cols = 80,
  55         .orig_video_lines = 24,
  56         .orig_video_isVGA = 1,
  57         .orig_video_points = 16,
  58 };
  59 #endif
  60
  61 #ifdef CONFIG_BLK_DEV_INITRD
  62 extern unsigned long initrd_start;
  63 extern unsigned long initrd_end;
  64 extern int initrd_below_start_ok;
  65 #endif
  66
  67 #ifdef CONFIG_USE_OF
  68 void *dtb_start = __dtb_start;
  69 #endif
  70
  71 extern unsigned long loops_per_jiffy;
  72
  73 /* Command line specified as configuration option. */
  74
  75 static char __initdata command_line[COMMAND_LINE_SIZE];
  76
  77 #ifdef CONFIG_CMDLINE_BOOL
  78 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  79 #endif
  80
  81 #ifdef CONFIG_PARSE_BOOTPARAM
  82 /*
  83  * Boot parameter parsing.
  84  *
  85  * The Xtensa port uses a list of variable-sized tags to pass data to
  86  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
  87  * to be recognised. The list is terminated with a zero-sized
  88  * BP_TAG_LAST tag.
  89  */
  90
  91 typedef struct tagtable {
  92         u32 tag;
  93         int (*parse)(const bp_tag_t*);
  94 } tagtable_t;
  95
  96 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
  97         __section(".taglist") __attribute__((used)) = { tag, fn }
  98
  99 /* parse current tag */
 100
 101 static int __init parse_tag_mem(const bp_tag_t *tag)
 102 {
 103         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 104
 105         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 106                 return -1;
 107
 108         return memblock_add(mi->start, mi->end - mi->start);
 109 }
 110
 111 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 112
 113 #ifdef CONFIG_BLK_DEV_INITRD
 114
 115 static int __init parse_tag_initrd(const bp_tag_t* tag)
 116 {
 117         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 118
 119         initrd_start = (unsigned long)__va(mi->start);
 120         initrd_end = (unsigned long)__va(mi->end);
 121
 122         return 0;
 123 }
 124
 125 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 126
 127 #endif /* CONFIG_BLK_DEV_INITRD */
 128
 129 #ifdef CONFIG_USE_OF
 130
 131 static int __init parse_tag_fdt(const bp_tag_t *tag)
 132 {
 133         dtb_start = __va(tag->data[0]);
 134         return 0;
 135 }
 136
 137 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 138
 139 #endif /* CONFIG_USE_OF */
 140
 141 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 142 {
 143         strscpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
 144         return 0;
 145 }
 146
 147 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 148
 149 static int __init parse_bootparam(const bp_tag_t* tag)
 150 {
 151         extern tagtable_t __tagtable_begin, __tagtable_end;
 152         tagtable_t *t;
 153
 154         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 155
 156         if (tag->id != BP_TAG_FIRST) {
 157                 pr_warn("Invalid boot parameters!\n");
 158                 return 0;
 159         }
 160
 161         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 162
 163         /* Parse all tags. */
 164
 165         while (tag != NULL && tag->id != BP_TAG_LAST) {
 166                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 167                         if (tag->id == t->tag) {
 168                                 t->parse(tag);
 169                                 break;
 170                         }
 171                 }
 172                 if (t == &__tagtable_end)
 173                         pr_warn("Ignoring tag 0x%08x\n", tag->id);
 174                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 175         }
 176
 177         return 0;
 178 }
 179 #else
 180 static int __init parse_bootparam(const bp_tag_t *tag)
 181 {
 182         pr_info("Ignoring boot parameters at %p\n", tag);
 183         return 0;
 184 }
 185 #endif
 186
 187 #ifdef CONFIG_USE_OF
 188
 189 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
 190 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
 191 EXPORT_SYMBOL(xtensa_kio_paddr);
 192
 193 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 194                 int depth, void *data)
 195 {
 196         const __be32 *ranges;
 197         int len;
 198
 199         if (depth > 1)
 200                 return 0;
 201
 202         if (!of_flat_dt_is_compatible(node, "simple-bus"))
 203                 return 0;
 204
 205         ranges = of_get_flat_dt_prop(node, "ranges", &len);
 206         if (!ranges)
 207                 return 1;
 208         if (len == 0)
 209                 return 1;
 210
 211         xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
 212         /* round down to nearest 256MB boundary */
 213         xtensa_kio_paddr &= 0xf0000000;
 214
 215         init_kio();
 216
 217         return 1;
 218 }
 219 #else
 220 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 221                 int depth, void *data)
 222 {
 223         return 1;
 224 }
 225 #endif
 226
 227 void __init early_init_devtree(void *params)
 228 {
 229         early_init_dt_scan(params);
 230         of_scan_flat_dt(xtensa_dt_io_area, NULL);
 231
 232         if (!command_line[0])
 233                 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 234 }
 235
 236 #endif /* CONFIG_USE_OF */
 237
 238 /*
 239  * Initialize architecture. (Early stage)
 240  */
 241
 242 void __init init_arch(bp_tag_t *bp_start)
 243 {
 244         /* Initialize MMU. */
 245
 246         init_mmu();
 247
 248         /* Initialize initial KASAN shadow map */
 249
 250         kasan_early_init();
 251
 252         /* Parse boot parameters */
 253
 254         if (bp_start)
 255                 parse_bootparam(bp_start);
 256
 257 #ifdef CONFIG_USE_OF
 258         early_init_devtree(dtb_start);
 259 #endif
 260
 261 #ifdef CONFIG_CMDLINE_BOOL
 262         if (!command_line[0])
 263                 strscpy(command_line, default_command_line, COMMAND_LINE_SIZE);
 264 #endif
 265
 266         /* Early hook for platforms */
 267
 268         platform_init(bp_start);
 269 }
 270
 271 /*
 272  * Initialize system. Setup memory and reserve regions.
 273  */
 274
 275 static inline int __init_memblock mem_reserve(unsigned long start,
 276                                               unsigned long end)
 277 {
 278         return memblock_reserve(start, end - start);
 279 }
 280
 281 void __init setup_arch(char **cmdline_p)
 282 {
 283         pr_info("config ID: %08x:%08x\n",
 284                 xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
 285         if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
 286             xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
 287                 pr_info("built for config ID: %08x:%08x\n",
 288                         XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
 289
 290         *cmdline_p = command_line;
 291         platform_setup(cmdline_p);
 292         strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 293
 294         /* Reserve some memory regions */
 295
 296 #ifdef CONFIG_BLK_DEV_INITRD
 297         if (initrd_start < initrd_end &&
 298             !mem_reserve(__pa(initrd_start), __pa(initrd_end)))
 299                 initrd_below_start_ok = 1;
 300         else
 301                 initrd_start = 0;
 302 #endif
 303
 304         mem_reserve(__pa(_stext), __pa(_end));
 305 #ifdef CONFIG_XIP_KERNEL
 306         mem_reserve(__pa(_xip_start), __pa(_xip_end));
 307 #endif
 308
 309 #ifdef CONFIG_VECTORS_ADDR
 310 #ifdef SUPPORT_WINDOWED
 311         mem_reserve(__pa(_WindowVectors_text_start),
 312                     __pa(_WindowVectors_text_end));
 313 #endif
 314
 315         mem_reserve(__pa(_DebugInterruptVector_text_start),
 316                     __pa(_DebugInterruptVector_text_end));
 317
 318         mem_reserve(__pa(_KernelExceptionVector_text_start),
 319                     __pa(_KernelExceptionVector_text_end));
 320
 321         mem_reserve(__pa(_UserExceptionVector_text_start),
 322                     __pa(_UserExceptionVector_text_end));
 323
 324         mem_reserve(__pa(_DoubleExceptionVector_text_start),
 325                     __pa(_DoubleExceptionVector_text_end));
 326
 327         mem_reserve(__pa(_exception_text_start),
 328                     __pa(_exception_text_end));
 329 #if XCHAL_EXCM_LEVEL >= 2
 330         mem_reserve(__pa(_Level2InterruptVector_text_start),
 331                     __pa(_Level2InterruptVector_text_end));
 332 #endif
 333 #if XCHAL_EXCM_LEVEL >= 3
 334         mem_reserve(__pa(_Level3InterruptVector_text_start),
 335                     __pa(_Level3InterruptVector_text_end));
 336 #endif
 337 #if XCHAL_EXCM_LEVEL >= 4
 338         mem_reserve(__pa(_Level4InterruptVector_text_start),
 339                     __pa(_Level4InterruptVector_text_end));
 340 #endif
 341 #if XCHAL_EXCM_LEVEL >= 5
 342         mem_reserve(__pa(_Level5InterruptVector_text_start),
 343                     __pa(_Level5InterruptVector_text_end));
 344 #endif
 345 #if XCHAL_EXCM_LEVEL >= 6
 346         mem_reserve(__pa(_Level6InterruptVector_text_start),
 347                     __pa(_Level6InterruptVector_text_end));
 348 #endif
 349
 350 #endif /* CONFIG_VECTORS_ADDR */
 351
 352 #ifdef CONFIG_SECONDARY_RESET_VECTOR
 353         mem_reserve(__pa(_SecondaryResetVector_text_start),
 354                     __pa(_SecondaryResetVector_text_end));
 355 #endif
 356         parse_early_param();
 357         bootmem_init();
 358         kasan_init();
 359         unflatten_and_copy_device_tree();
 360
 361 #ifdef CONFIG_SMP
 362         smp_init_cpus();
 363 #endif
 364
 365         paging_init();
 366         zones_init();
 367
 368 #ifdef CONFIG_VT
 369 # if defined(CONFIG_VGA_CONSOLE)
 370         conswitchp = &vga_con;
 371 # endif
 372 #endif
 373 }
 374
 375 static DEFINE_PER_CPU(struct cpu, cpu_data);
 376
 377 static int __init topology_init(void)
 378 {
 379         int i;
 380
 381         for_each_possible_cpu(i) {
 382                 struct cpu *cpu = &per_cpu(cpu_data, i);
 383                 cpu->hotpluggable = !!i;
 384                 register_cpu(cpu, i);
 385         }
 386
 387         return 0;
 388 }
 389 subsys_initcall(topology_init);
 390
 391 void cpu_reset(void)
 392 {
 393 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
 394         local_irq_disable();
 395         /*
 396          * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
 397          * be flushed.
 398          * Way 4 is not currently used by linux.
 399          * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
 400          * Way 5 shall be flushed and way 6 shall be set to identity mapping
 401          * on MMUv3.
 402          */
 403         local_flush_tlb_all();
 404         invalidate_page_directory();
 405 #if XCHAL_HAVE_SPANNING_WAY
 406         /* MMU v3 */
 407         {
 408                 unsigned long vaddr = (unsigned long)cpu_reset;
 409                 unsigned long paddr = __pa(vaddr);
 410                 unsigned long tmpaddr = vaddr + SZ_512M;
 411                 unsigned long tmp0, tmp1, tmp2, tmp3;
 412
 413                 /*
 414                  * Find a place for the temporary mapping. It must not be
 415                  * in the same 512MB region with vaddr or paddr, otherwise
 416                  * there may be multihit exception either on entry to the
 417                  * temporary mapping, or on entry to the identity mapping.
 418                  * (512MB is the biggest page size supported by TLB.)
 419                  */
 420                 while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
 421                         tmpaddr += SZ_512M;
 422
 423                 /* Invalidate mapping in the selected temporary area */
 424                 if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
 425                         invalidate_itlb_entry(itlb_probe(tmpaddr));
 426                 if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
 427                         invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
 428
 429                 /*
 430                  * Map two consecutive pages starting at the physical address
 431                  * of this function to the temporary mapping area.
 432                  */
 433                 write_itlb_entry(__pte((paddr & PAGE_MASK) |
 434                                        _PAGE_HW_VALID |
 435                                        _PAGE_HW_EXEC |
 436                                        _PAGE_CA_BYPASS),
 437                                  tmpaddr & PAGE_MASK);
 438                 write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
 439                                        _PAGE_HW_VALID |
 440                                        _PAGE_HW_EXEC |
 441                                        _PAGE_CA_BYPASS),
 442                                  (tmpaddr & PAGE_MASK) + PAGE_SIZE);
 443
 444                 /* Reinitialize TLB */
 445                 __asm__ __volatile__ ("movi     %0, 1f\n\t"
 446                                       "movi     %3, 2f\n\t"
 447                                       "add      %0, %0, %4\n\t"
 448                                       "add      %3, %3, %5\n\t"
 449                                       "jx       %0\n"
 450                                       /*
 451                                        * No literal, data or stack access
 452                                        * below this point
 453                                        */
 454                                       "1:\n\t"
 455                                       /* Initialize *tlbcfg */
 456                                       "movi     %0, 0\n\t"
 457                                       "wsr      %0, itlbcfg\n\t"
 458                                       "wsr      %0, dtlbcfg\n\t"
 459                                       /* Invalidate TLB way 5 */
 460                                       "movi     %0, 4\n\t"
 461                                       "movi     %1, 5\n"
 462                                       "1:\n\t"
 463                                       "iitlb    %1\n\t"
 464                                       "idtlb    %1\n\t"
 465                                       "add      %1, %1, %6\n\t"
 466                                       "addi     %0, %0, -1\n\t"
 467                                       "bnez     %0, 1b\n\t"
 468                                       /* Initialize TLB way 6 */
 469                                       "movi     %0, 7\n\t"
 470                                       "addi     %1, %9, 3\n\t"
 471                                       "addi     %2, %9, 6\n"
 472                                       "1:\n\t"
 473                                       "witlb    %1, %2\n\t"
 474                                       "wdtlb    %1, %2\n\t"
 475                                       "add      %1, %1, %7\n\t"
 476                                       "add      %2, %2, %7\n\t"
 477                                       "addi     %0, %0, -1\n\t"
 478                                       "bnez     %0, 1b\n\t"
 479                                       "isync\n\t"
 480                                       /* Jump to identity mapping */
 481                                       "jx       %3\n"
 482                                       "2:\n\t"
 483                                       /* Complete way 6 initialization */
 484                                       "witlb    %1, %2\n\t"
 485                                       "wdtlb    %1, %2\n\t"
 486                                       /* Invalidate temporary mapping */
 487                                       "sub      %0, %9, %7\n\t"
 488                                       "iitlb    %0\n\t"
 489                                       "add      %0, %0, %8\n\t"
 490                                       "iitlb    %0"
 491                                       : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
 492                                         "=&a"(tmp3)
 493                                       : "a"(tmpaddr - vaddr),
 494                                         "a"(paddr - vaddr),
 495                                         "a"(SZ_128M), "a"(SZ_512M),
 496                                         "a"(PAGE_SIZE),
 497                                         "a"((tmpaddr + SZ_512M) & PAGE_MASK)
 498                                       : "memory");
 499         }
 500 #endif
 501 #endif
 502         __asm__ __volatile__ ("movi     a2, 0\n\t"
 503                               "wsr      a2, icountlevel\n\t"
 504                               "movi     a2, 0\n\t"
 505                               "wsr      a2, icount\n\t"
 506 #if XCHAL_NUM_IBREAK > 0
 507                               "wsr      a2, ibreakenable\n\t"
 508 #endif
 509 #if XCHAL_HAVE_LOOPS
 510                               "wsr      a2, lcount\n\t"
 511 #endif
 512                               "movi     a2, 0x1f\n\t"
 513                               "wsr      a2, ps\n\t"
 514                               "isync\n\t"
 515                               "jx       %0\n\t"
 516                               :
 517                               : "a" (XCHAL_RESET_VECTOR_VADDR)
 518                               : "a2");
 519         for (;;)
 520                 ;
 521 }
 522
 523 void machine_restart(char * cmd)
 524 {
 525         platform_restart();
 526 }
 527
 528 void machine_halt(void)
 529 {
 530         platform_halt();
 531         while (1);
 532 }
 533
 534 void machine_power_off(void)
 535 {
 536         platform_power_off();
 537         while (1);
 538 }
 539 #ifdef CONFIG_PROC_FS
 540
 541 /*
 542  * Display some core information through /proc/cpuinfo.
 543  */
 544
 545 static int
 546 c_show(struct seq_file *f, void *slot)
 547 {
 548         /* high-level stuff */
 549         seq_printf(f, "CPU count\t: %u\n"
 550                       "CPU list\t: %*pbl\n"
 551                       "vendor_id\t: Tensilica\n"
 552                       "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 553                       "core ID\t\t: " XCHAL_CORE_ID "\n"
 554                       "build ID\t: 0x%x\n"
 555                       "config ID\t: %08x:%08x\n"
 556                       "byte order\t: %s\n"
 557                       "cpu MHz\t\t: %lu.%02lu\n"
 558                       "bogomips\t: %lu.%02lu\n",
 559                       num_online_cpus(),
 560                       cpumask_pr_args(cpu_online_mask),
 561                       XCHAL_BUILD_UNIQUE_ID,
 562                       xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
 563                       XCHAL_HAVE_BE ?  "big" : "little",
 564                       ccount_freq/1000000,
 565                       (ccount_freq/10000) % 100,
 566                       loops_per_jiffy/(500000/HZ),
 567                       (loops_per_jiffy/(5000/HZ)) % 100);
 568         seq_puts(f, "flags\t\t: "
 569 #if XCHAL_HAVE_NMI
 570                      "nmi "
 571 #endif
 572 #if XCHAL_HAVE_DEBUG
 573                      "debug "
 574 # if XCHAL_HAVE_OCD
 575                      "ocd "
 576 # endif
 577 #endif
 578 #if XCHAL_HAVE_DENSITY
 579                      "density "
 580 #endif
 581 #if XCHAL_HAVE_BOOLEANS
 582                      "boolean "
 583 #endif
 584 #if XCHAL_HAVE_LOOPS
 585                      "loop "
 586 #endif
 587 #if XCHAL_HAVE_NSA
 588                      "nsa "
 589 #endif
 590 #if XCHAL_HAVE_MINMAX
 591                      "minmax "
 592 #endif
 593 #if XCHAL_HAVE_SEXT
 594                      "sext "
 595 #endif
 596 #if XCHAL_HAVE_CLAMPS
 597                      "clamps "
 598 #endif
 599 #if XCHAL_HAVE_MAC16
 600                      "mac16 "
 601 #endif
 602 #if XCHAL_HAVE_MUL16
 603                      "mul16 "
 604 #endif
 605 #if XCHAL_HAVE_MUL32
 606                      "mul32 "
 607 #endif
 608 #if XCHAL_HAVE_MUL32_HIGH
 609                      "mul32h "
 610 #endif
 611 #if XCHAL_HAVE_FP
 612                      "fpu "
 613 #endif
 614 #if XCHAL_HAVE_S32C1I
 615                      "s32c1i "
 616 #endif
 617 #if XCHAL_HAVE_EXCLUSIVE
 618                      "exclusive "
 619 #endif
 620                      "\n");
 621
 622         /* Registers. */
 623         seq_printf(f,"physical aregs\t: %d\n"
 624                      "misc regs\t: %d\n"
 625                      "ibreak\t\t: %d\n"
 626                      "dbreak\t\t: %d\n",
 627                      XCHAL_NUM_AREGS,
 628                      XCHAL_NUM_MISC_REGS,
 629                      XCHAL_NUM_IBREAK,
 630                      XCHAL_NUM_DBREAK);
 631
 632
 633         /* Interrupt. */
 634         seq_printf(f,"num ints\t: %d\n"
 635                      "ext ints\t: %d\n"
 636                      "int levels\t: %d\n"
 637                      "timers\t\t: %d\n"
 638                      "debug level\t: %d\n",
 639                      XCHAL_NUM_INTERRUPTS,
 640                      XCHAL_NUM_EXTINTERRUPTS,
 641                      XCHAL_NUM_INTLEVELS,
 642                      XCHAL_NUM_TIMERS,
 643                      XCHAL_DEBUGLEVEL);
 644
 645         /* Cache */
 646         seq_printf(f,"icache line size: %d\n"
 647                      "icache ways\t: %d\n"
 648                      "icache size\t: %d\n"
 649                      "icache flags\t: "
 650 #if XCHAL_ICACHE_LINE_LOCKABLE
 651                      "lock "
 652 #endif
 653                      "\n"
 654                      "dcache line size: %d\n"
 655                      "dcache ways\t: %d\n"
 656                      "dcache size\t: %d\n"
 657                      "dcache flags\t: "
 658 #if XCHAL_DCACHE_IS_WRITEBACK
 659                      "writeback "
 660 #endif
 661 #if XCHAL_DCACHE_LINE_LOCKABLE
 662                      "lock "
 663 #endif
 664                      "\n",
 665                      XCHAL_ICACHE_LINESIZE,
 666                      XCHAL_ICACHE_WAYS,
 667                      XCHAL_ICACHE_SIZE,
 668                      XCHAL_DCACHE_LINESIZE,
 669                      XCHAL_DCACHE_WAYS,
 670                      XCHAL_DCACHE_SIZE);
 671
 672         return 0;
 673 }
 674
 675 /*
 676  * We show only CPU #0 info.
 677  */
 678 static void *
 679 c_start(struct seq_file *f, loff_t *pos)
 680 {
 681         return (*pos == 0) ? (void *)1 : NULL;
 682 }
 683
 684 static void *
 685 c_next(struct seq_file *f, void *v, loff_t *pos)
 686 {
 687         ++*pos;
 688         return c_start(f, pos);
 689 }
 690
 691 static void
 692 c_stop(struct seq_file *f, void *v)
 693 {
 694 }
 695
 696 const struct seq_operations cpuinfo_op =
 697 {
 698         .start  = c_start,
 699         .next   = c_next,
 700         .stop   = c_stop,
 701         .show   = c_show,
 702 };
 703
 704 #endif /* CONFIG_PROC_FS */