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  *
  11  * Chris Zankel <chris@zankel.net>
  12  * Joe Taylor   <joe@tensilica.com, joetylr@yahoo.com>
  13  * Kevin Chea
  14  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/screen_info.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/kernel.h>
  24 #include <linux/percpu.h>
  25 #include <linux/clk-provider.h>
  26 #include <linux/cpu.h>
  27 #include <linux/of_fdt.h>
  28 #include <linux/of_platform.h>
  29
  30 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  31 # include <linux/console.h>
  32 #endif
  33
  34 #ifdef CONFIG_RTC
  35 # include <linux/timex.h>
  36 #endif
  37
  38 #ifdef CONFIG_PROC_FS
  39 # include <linux/seq_file.h>
  40 #endif
  41
  42 #include <asm/bootparam.h>
  43 #include <asm/mmu_context.h>
  44 #include <asm/pgtable.h>
  45 #include <asm/processor.h>
  46 #include <asm/timex.h>
  47 #include <asm/platform.h>
  48 #include <asm/page.h>
  49 #include <asm/setup.h>
  50 #include <asm/param.h>
  51 #include <asm/traps.h>
  52 #include <asm/smp.h>
  53
  54 #include <platform/hardware.h>
  55
  56 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  57 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  58 #endif
  59
  60 #ifdef CONFIG_BLK_DEV_FD
  61 extern struct fd_ops no_fd_ops;
  62 struct fd_ops *fd_ops;
  63 #endif
  64
  65 extern struct rtc_ops no_rtc_ops;
  66 struct rtc_ops *rtc_ops;
  67
  68 #ifdef CONFIG_BLK_DEV_INITRD
  69 extern unsigned long initrd_start;
  70 extern unsigned long initrd_end;
  71 int initrd_is_mapped = 0;
  72 extern int initrd_below_start_ok;
  73 #endif
  74
  75 #ifdef CONFIG_OF
  76 extern u32 __dtb_start[];
  77 void *dtb_start = __dtb_start;
  78 #endif
  79
  80 unsigned char aux_device_present;
  81 extern unsigned long loops_per_jiffy;
  82
  83 /* Command line specified as configuration option. */
  84
  85 static char __initdata command_line[COMMAND_LINE_SIZE];
  86
  87 #ifdef CONFIG_CMDLINE_BOOL
  88 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  89 #endif
  90
  91 sysmem_info_t __initdata sysmem;
  92
  93 extern int mem_reserve(unsigned long, unsigned long, int);
  94 extern void bootmem_init(void);
  95 extern void zones_init(void);
  96
  97 /*
  98  * Boot parameter parsing.
  99  *
 100  * The Xtensa port uses a list of variable-sized tags to pass data to
 101  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 102  * to be recognised. The list is terminated with a zero-sized
 103  * BP_TAG_LAST tag.
 104  */
 105
 106 typedef struct tagtable {
 107         u32 tag;
 108         int (*parse)(const bp_tag_t*);
 109 } tagtable_t;
 110
 111 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 112         __attribute__((used, section(".taglist"))) = { tag, fn }
 113
 114 /* parse current tag */
 115
 116 static int __init add_sysmem_bank(unsigned long type, unsigned long start,
 117                 unsigned long end)
 118 {
 119         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 120                 printk(KERN_WARNING
 121                                 "Ignoring memory bank 0x%08lx size %ldKB\n",
 122                                 start, end - start);
 123                 return -EINVAL;
 124         }
 125         sysmem.bank[sysmem.nr_banks].type  = type;
 126         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(start);
 127         sysmem.bank[sysmem.nr_banks].end   = end & PAGE_MASK;
 128         sysmem.nr_banks++;
 129
 130         return 0;
 131 }
 132
 133 static int __init parse_tag_mem(const bp_tag_t *tag)
 134 {
 135         meminfo_t *mi = (meminfo_t *)(tag->data);
 136
 137         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 138                 return -1;
 139
 140         return add_sysmem_bank(mi->type, mi->start, mi->end);
 141 }
 142
 143 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 144
 145 #ifdef CONFIG_BLK_DEV_INITRD
 146
 147 static int __init parse_tag_initrd(const bp_tag_t* tag)
 148 {
 149         meminfo_t* mi;
 150         mi = (meminfo_t*)(tag->data);
 151         initrd_start = (unsigned long)__va(mi->start);
 152         initrd_end = (unsigned long)__va(mi->end);
 153
 154         return 0;
 155 }
 156
 157 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 158
 159 #ifdef CONFIG_OF
 160
 161 static int __init parse_tag_fdt(const bp_tag_t *tag)
 162 {
 163         dtb_start = __va(tag->data[0]);
 164         return 0;
 165 }
 166
 167 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 168
 169 #endif /* CONFIG_OF */
 170
 171 #endif /* CONFIG_BLK_DEV_INITRD */
 172
 173 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 174 {
 175         strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
 176         return 0;
 177 }
 178
 179 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 180
 181 static int __init parse_bootparam(const bp_tag_t* tag)
 182 {
 183         extern tagtable_t __tagtable_begin, __tagtable_end;
 184         tagtable_t *t;
 185
 186         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 187
 188         if (tag->id != BP_TAG_FIRST) {
 189                 printk(KERN_WARNING "Invalid boot parameters!\n");
 190                 return 0;
 191         }
 192
 193         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 194
 195         /* Parse all tags. */
 196
 197         while (tag != NULL && tag->id != BP_TAG_LAST) {
 198                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 199                         if (tag->id == t->tag) {
 200                                 t->parse(tag);
 201                                 break;
 202                         }
 203                 }
 204                 if (t == &__tagtable_end)
 205                         printk(KERN_WARNING "Ignoring tag "
 206                                "0x%08x\n", tag->id);
 207                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 208         }
 209
 210         return 0;
 211 }
 212
 213 #ifdef CONFIG_OF
 214 bool __initdata dt_memory_scan = false;
 215
 216 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
 217 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
 218 EXPORT_SYMBOL(xtensa_kio_paddr);
 219
 220 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 221                 int depth, void *data)
 222 {
 223         const __be32 *ranges;
 224         unsigned long len;
 225
 226         if (depth > 1)
 227                 return 0;
 228
 229         if (!of_flat_dt_is_compatible(node, "simple-bus"))
 230                 return 0;
 231
 232         ranges = of_get_flat_dt_prop(node, "ranges", &len);
 233         if (!ranges)
 234                 return 1;
 235         if (len == 0)
 236                 return 1;
 237
 238         xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
 239         /* round down to nearest 256MB boundary */
 240         xtensa_kio_paddr &= 0xf0000000;
 241
 242         return 1;
 243 }
 244 #else
 245 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 246                 int depth, void *data)
 247 {
 248         return 1;
 249 }
 250 #endif
 251
 252 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 253 {
 254         if (!dt_memory_scan)
 255                 return;
 256
 257         size &= PAGE_MASK;
 258         add_sysmem_bank(MEMORY_TYPE_CONVENTIONAL, base, base + size);
 259 }
 260
 261 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 262 {
 263         return __alloc_bootmem(size, align, 0);
 264 }
 265
 266 void __init early_init_devtree(void *params)
 267 {
 268         if (sysmem.nr_banks == 0)
 269                 dt_memory_scan = true;
 270
 271         early_init_dt_scan(params);
 272         of_scan_flat_dt(xtensa_dt_io_area, NULL);
 273
 274         if (!command_line[0])
 275                 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 276 }
 277
 278 static int __init xtensa_device_probe(void)
 279 {
 280         of_clk_init(NULL);
 281         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 282         return 0;
 283 }
 284
 285 device_initcall(xtensa_device_probe);
 286
 287 #endif /* CONFIG_OF */
 288
 289 /*
 290  * Initialize architecture. (Early stage)
 291  */
 292
 293 void __init init_arch(bp_tag_t *bp_start)
 294 {
 295         sysmem.nr_banks = 0;
 296
 297         /* Parse boot parameters */
 298
 299         if (bp_start)
 300                 parse_bootparam(bp_start);
 301
 302 #ifdef CONFIG_OF
 303         early_init_devtree(dtb_start);
 304 #endif
 305
 306         if (sysmem.nr_banks == 0) {
 307                 sysmem.nr_banks = 1;
 308                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 309                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 310                                      + PLATFORM_DEFAULT_MEM_SIZE;
 311         }
 312
 313 #ifdef CONFIG_CMDLINE_BOOL
 314         if (!command_line[0])
 315                 strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
 316 #endif
 317
 318         /* Early hook for platforms */
 319
 320         platform_init(bp_start);
 321
 322         /* Initialize MMU. */
 323
 324         init_mmu();
 325 }
 326
 327 /*
 328  * Initialize system. Setup memory and reserve regions.
 329  */
 330
 331 extern char _end;
 332 extern char _stext;
 333 extern char _WindowVectors_text_start;
 334 extern char _WindowVectors_text_end;
 335 extern char _DebugInterruptVector_literal_start;
 336 extern char _DebugInterruptVector_text_end;
 337 extern char _KernelExceptionVector_literal_start;
 338 extern char _KernelExceptionVector_text_end;
 339 extern char _UserExceptionVector_literal_start;
 340 extern char _UserExceptionVector_text_end;
 341 extern char _DoubleExceptionVector_literal_start;
 342 extern char _DoubleExceptionVector_text_end;
 343 #if XCHAL_EXCM_LEVEL >= 2
 344 extern char _Level2InterruptVector_text_start;
 345 extern char _Level2InterruptVector_text_end;
 346 #endif
 347 #if XCHAL_EXCM_LEVEL >= 3
 348 extern char _Level3InterruptVector_text_start;
 349 extern char _Level3InterruptVector_text_end;
 350 #endif
 351 #if XCHAL_EXCM_LEVEL >= 4
 352 extern char _Level4InterruptVector_text_start;
 353 extern char _Level4InterruptVector_text_end;
 354 #endif
 355 #if XCHAL_EXCM_LEVEL >= 5
 356 extern char _Level5InterruptVector_text_start;
 357 extern char _Level5InterruptVector_text_end;
 358 #endif
 359 #if XCHAL_EXCM_LEVEL >= 6
 360 extern char _Level6InterruptVector_text_start;
 361 extern char _Level6InterruptVector_text_end;
 362 #endif
 363
 364
 365
 366 #ifdef CONFIG_S32C1I_SELFTEST
 367 #if XCHAL_HAVE_S32C1I
 368
 369 static int __initdata rcw_word, rcw_probe_pc, rcw_exc;
 370
 371 /*
 372  * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
 373  *
 374  * If *v == cmp, set *v = set.  Return previous *v.
 375  */
 376 static inline int probed_compare_swap(int *v, int cmp, int set)
 377 {
 378         int tmp;
 379
 380         __asm__ __volatile__(
 381                         "       movi    %1, 1f\n"
 382                         "       s32i    %1, %4, 0\n"
 383                         "       wsr     %2, scompare1\n"
 384                         "1:     s32c1i  %0, %3, 0\n"
 385                         : "=a" (set), "=&a" (tmp)
 386                         : "a" (cmp), "a" (v), "a" (&rcw_probe_pc), "0" (set)
 387                         : "memory"
 388                         );
 389         return set;
 390 }
 391
 392 /* Handle probed exception */
 393
 394 static void __init do_probed_exception(struct pt_regs *regs,
 395                 unsigned long exccause)
 396 {
 397         if (regs->pc == rcw_probe_pc) { /* exception on s32c1i ? */
 398                 regs->pc += 3;          /* skip the s32c1i instruction */
 399                 rcw_exc = exccause;
 400         } else {
 401                 do_unhandled(regs, exccause);
 402         }
 403 }
 404
 405 /* Simple test of S32C1I (soc bringup assist) */
 406
 407 static int __init check_s32c1i(void)
 408 {
 409         int n, cause1, cause2;
 410         void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
 411
 412         rcw_probe_pc = 0;
 413         handbus  = trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR,
 414                         do_probed_exception);
 415         handdata = trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR,
 416                         do_probed_exception);
 417         handaddr = trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR,
 418                         do_probed_exception);
 419
 420         /* First try an S32C1I that does not store: */
 421         rcw_exc = 0;
 422         rcw_word = 1;
 423         n = probed_compare_swap(&rcw_word, 0, 2);
 424         cause1 = rcw_exc;
 425
 426         /* took exception? */
 427         if (cause1 != 0) {
 428                 /* unclean exception? */
 429                 if (n != 2 || rcw_word != 1)
 430                         panic("S32C1I exception error");
 431         } else if (rcw_word != 1 || n != 1) {
 432                 panic("S32C1I compare error");
 433         }
 434
 435         /* Then an S32C1I that stores: */
 436         rcw_exc = 0;
 437         rcw_word = 0x1234567;
 438         n = probed_compare_swap(&rcw_word, 0x1234567, 0xabcde);
 439         cause2 = rcw_exc;
 440
 441         if (cause2 != 0) {
 442                 /* unclean exception? */
 443                 if (n != 0xabcde || rcw_word != 0x1234567)
 444                         panic("S32C1I exception error (b)");
 445         } else if (rcw_word != 0xabcde || n != 0x1234567) {
 446                 panic("S32C1I store error");
 447         }
 448
 449         /* Verify consistency of exceptions: */
 450         if (cause1 || cause2) {
 451                 pr_warn("S32C1I took exception %d, %d\n", cause1, cause2);
 452                 /* If emulation of S32C1I upon bus error gets implemented,
 453                    we can get rid of this panic for single core (not SMP) */
 454                 panic("S32C1I exceptions not currently supported");
 455         }
 456         if (cause1 != cause2)
 457                 panic("inconsistent S32C1I exceptions");
 458
 459         trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);
 460         trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);
 461         trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);
 462         return 0;
 463 }
 464
 465 #else /* XCHAL_HAVE_S32C1I */
 466
 467 /* This condition should not occur with a commercially deployed processor.
 468    Display reminder for early engr test or demo chips / FPGA bitstreams */
 469 static int __init check_s32c1i(void)
 470 {
 471         pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
 472         return 0;
 473 }
 474
 475 #endif /* XCHAL_HAVE_S32C1I */
 476 early_initcall(check_s32c1i);
 477 #endif /* CONFIG_S32C1I_SELFTEST */
 478
 479
 480 void __init setup_arch(char **cmdline_p)
 481 {
 482         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 483         *cmdline_p = command_line;
 484
 485         /* Reserve some memory regions */
 486
 487 #ifdef CONFIG_BLK_DEV_INITRD
 488         if (initrd_start < initrd_end) {
 489                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 490                                                __pa(initrd_end), 0);
 491                 initrd_below_start_ok = 1;
 492         } else {
 493                 initrd_start = 0;
 494         }
 495 #endif
 496
 497         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 498
 499         mem_reserve(__pa(&_WindowVectors_text_start),
 500                     __pa(&_WindowVectors_text_end), 0);
 501
 502         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 503                     __pa(&_DebugInterruptVector_text_end), 0);
 504
 505         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 506                     __pa(&_KernelExceptionVector_text_end), 0);
 507
 508         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 509                     __pa(&_UserExceptionVector_text_end), 0);
 510
 511         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 512                     __pa(&_DoubleExceptionVector_text_end), 0);
 513
 514 #if XCHAL_EXCM_LEVEL >= 2
 515         mem_reserve(__pa(&_Level2InterruptVector_text_start),
 516                     __pa(&_Level2InterruptVector_text_end), 0);
 517 #endif
 518 #if XCHAL_EXCM_LEVEL >= 3
 519         mem_reserve(__pa(&_Level3InterruptVector_text_start),
 520                     __pa(&_Level3InterruptVector_text_end), 0);
 521 #endif
 522 #if XCHAL_EXCM_LEVEL >= 4
 523         mem_reserve(__pa(&_Level4InterruptVector_text_start),
 524                     __pa(&_Level4InterruptVector_text_end), 0);
 525 #endif
 526 #if XCHAL_EXCM_LEVEL >= 5
 527         mem_reserve(__pa(&_Level5InterruptVector_text_start),
 528                     __pa(&_Level5InterruptVector_text_end), 0);
 529 #endif
 530 #if XCHAL_EXCM_LEVEL >= 6
 531         mem_reserve(__pa(&_Level6InterruptVector_text_start),
 532                     __pa(&_Level6InterruptVector_text_end), 0);
 533 #endif
 534
 535         bootmem_init();
 536
 537         unflatten_and_copy_device_tree();
 538
 539         platform_setup(cmdline_p);
 540
 541 #ifdef CONFIG_SMP
 542         smp_init_cpus();
 543 #endif
 544
 545         paging_init();
 546         zones_init();
 547
 548 #ifdef CONFIG_VT
 549 # if defined(CONFIG_VGA_CONSOLE)
 550         conswitchp = &vga_con;
 551 # elif defined(CONFIG_DUMMY_CONSOLE)
 552         conswitchp = &dummy_con;
 553 # endif
 554 #endif
 555
 556 #ifdef CONFIG_PCI
 557         platform_pcibios_init();
 558 #endif
 559 }
 560
 561 static DEFINE_PER_CPU(struct cpu, cpu_data);
 562
 563 static int __init topology_init(void)
 564 {
 565         int i;
 566
 567         for_each_possible_cpu(i) {
 568                 struct cpu *cpu = &per_cpu(cpu_data, i);
 569                 cpu->hotpluggable = !!i;
 570                 register_cpu(cpu, i);
 571         }
 572
 573         return 0;
 574 }
 575 subsys_initcall(topology_init);
 576
 577 void machine_restart(char * cmd)
 578 {
 579         platform_restart();
 580 }
 581
 582 void machine_halt(void)
 583 {
 584         platform_halt();
 585         while (1);
 586 }
 587
 588 void machine_power_off(void)
 589 {
 590         platform_power_off();
 591         while (1);
 592 }
 593 #ifdef CONFIG_PROC_FS
 594
 595 /*
 596  * Display some core information through /proc/cpuinfo.
 597  */
 598
 599 static int
 600 c_show(struct seq_file *f, void *slot)
 601 {
 602         char buf[NR_CPUS * 5];
 603
 604         cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
 605         /* high-level stuff */
 606         seq_printf(f, "CPU count\t: %u\n"
 607                       "CPU list\t: %s\n"
 608                       "vendor_id\t: Tensilica\n"
 609                       "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 610                       "core ID\t\t: " XCHAL_CORE_ID "\n"
 611                       "build ID\t: 0x%x\n"
 612                       "byte order\t: %s\n"
 613                       "cpu MHz\t\t: %lu.%02lu\n"
 614                       "bogomips\t: %lu.%02lu\n",
 615                       num_online_cpus(),
 616                       buf,
 617                       XCHAL_BUILD_UNIQUE_ID,
 618                       XCHAL_HAVE_BE ?  "big" : "little",
 619                       ccount_freq/1000000,
 620                       (ccount_freq/10000) % 100,
 621                       loops_per_jiffy/(500000/HZ),
 622                       (loops_per_jiffy/(5000/HZ)) % 100);
 623
 624         seq_printf(f,"flags\t\t: "
 625 #if XCHAL_HAVE_NMI
 626                      "nmi "
 627 #endif
 628 #if XCHAL_HAVE_DEBUG
 629                      "debug "
 630 # if XCHAL_HAVE_OCD
 631                      "ocd "
 632 # endif
 633 #endif
 634 #if XCHAL_HAVE_DENSITY
 635                      "density "
 636 #endif
 637 #if XCHAL_HAVE_BOOLEANS
 638                      "boolean "
 639 #endif
 640 #if XCHAL_HAVE_LOOPS
 641                      "loop "
 642 #endif
 643 #if XCHAL_HAVE_NSA
 644                      "nsa "
 645 #endif
 646 #if XCHAL_HAVE_MINMAX
 647                      "minmax "
 648 #endif
 649 #if XCHAL_HAVE_SEXT
 650                      "sext "
 651 #endif
 652 #if XCHAL_HAVE_CLAMPS
 653                      "clamps "
 654 #endif
 655 #if XCHAL_HAVE_MAC16
 656                      "mac16 "
 657 #endif
 658 #if XCHAL_HAVE_MUL16
 659                      "mul16 "
 660 #endif
 661 #if XCHAL_HAVE_MUL32
 662                      "mul32 "
 663 #endif
 664 #if XCHAL_HAVE_MUL32_HIGH
 665                      "mul32h "
 666 #endif
 667 #if XCHAL_HAVE_FP
 668                      "fpu "
 669 #endif
 670 #if XCHAL_HAVE_S32C1I
 671                      "s32c1i "
 672 #endif
 673                      "\n");
 674
 675         /* Registers. */
 676         seq_printf(f,"physical aregs\t: %d\n"
 677                      "misc regs\t: %d\n"
 678                      "ibreak\t\t: %d\n"
 679                      "dbreak\t\t: %d\n",
 680                      XCHAL_NUM_AREGS,
 681                      XCHAL_NUM_MISC_REGS,
 682                      XCHAL_NUM_IBREAK,
 683                      XCHAL_NUM_DBREAK);
 684
 685
 686         /* Interrupt. */
 687         seq_printf(f,"num ints\t: %d\n"
 688                      "ext ints\t: %d\n"
 689                      "int levels\t: %d\n"
 690                      "timers\t\t: %d\n"
 691                      "debug level\t: %d\n",
 692                      XCHAL_NUM_INTERRUPTS,
 693                      XCHAL_NUM_EXTINTERRUPTS,
 694                      XCHAL_NUM_INTLEVELS,
 695                      XCHAL_NUM_TIMERS,
 696                      XCHAL_DEBUGLEVEL);
 697
 698         /* Cache */
 699         seq_printf(f,"icache line size: %d\n"
 700                      "icache ways\t: %d\n"
 701                      "icache size\t: %d\n"
 702                      "icache flags\t: "
 703 #if XCHAL_ICACHE_LINE_LOCKABLE
 704                      "lock "
 705 #endif
 706                      "\n"
 707                      "dcache line size: %d\n"
 708                      "dcache ways\t: %d\n"
 709                      "dcache size\t: %d\n"
 710                      "dcache flags\t: "
 711 #if XCHAL_DCACHE_IS_WRITEBACK
 712                      "writeback "
 713 #endif
 714 #if XCHAL_DCACHE_LINE_LOCKABLE
 715                      "lock "
 716 #endif
 717                      "\n",
 718                      XCHAL_ICACHE_LINESIZE,
 719                      XCHAL_ICACHE_WAYS,
 720                      XCHAL_ICACHE_SIZE,
 721                      XCHAL_DCACHE_LINESIZE,
 722                      XCHAL_DCACHE_WAYS,
 723                      XCHAL_DCACHE_SIZE);
 724
 725         return 0;
 726 }
 727
 728 /*
 729  * We show only CPU #0 info.
 730  */
 731 static void *
 732 c_start(struct seq_file *f, loff_t *pos)
 733 {
 734         return (*pos == 0) ? (void *)1 : NULL;
 735 }
 736
 737 static void *
 738 c_next(struct seq_file *f, void *v, loff_t *pos)
 739 {
 740         return NULL;
 741 }
 742
 743 static void
 744 c_stop(struct seq_file *f, void *v)
 745 {
 746 }
 747
 748 const struct seq_operations cpuinfo_op =
 749 {
 750         .start  = c_start,
 751         .next   = c_next,
 752         .stop   = c_stop,
 753         .show   = c_show,
 754 };
 755
 756 #endif /* CONFIG_PROC_FS */