arch/ppc/kernel/setup.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/module.h>
   7 #include <linux/string.h>
   8 #include <linux/sched.h>
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/reboot.h>
  12 #include <linux/delay.h>
  13 #include <linux/initrd.h>
  14 #include <linux/ide.h>
  15 #include <linux/tty.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/seq_file.h>
  18 #include <linux/root_dev.h>
  19 #include <linux/cpu.h>
  20 #include <linux/console.h>
  21
  22 #include <asm/residual.h>
  23 #include <asm/io.h>
  24 #include <asm/prom.h>
  25 #include <asm/processor.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/bootinfo.h>
  28 #include <asm/setup.h>
  29 #include <asm/amigappc.h>
  30 #include <asm/smp.h>
  31 #include <asm/elf.h>
  32 #include <asm/cputable.h>
  33 #include <asm/bootx.h>
  34 #include <asm/btext.h>
  35 #include <asm/machdep.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/system.h>
  38 #include <asm/pmac_feature.h>
  39 #include <asm/sections.h>
  40 #include <asm/nvram.h>
  41 #include <asm/xmon.h>
  42 #include <asm/ocp.h>
  43
  44 #define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
  45                       defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
  46                       defined(CONFIG_PPC_MPC52xx))
  47
  48 #if USES_PPC_SYS
  49 #include <asm/ppc_sys.h>
  50 #endif
  51
  52 #if defined CONFIG_KGDB
  53 #include <asm/kgdb.h>
  54 #endif
  55
  56 extern void platform_init(unsigned long r3, unsigned long r4,
  57                 unsigned long r5, unsigned long r6, unsigned long r7);
  58 extern void bootx_init(unsigned long r4, unsigned long phys);
  59 extern void identify_cpu(unsigned long offset, unsigned long cpu);
  60 extern void do_cpu_ftr_fixups(unsigned long offset);
  61 extern void reloc_got2(unsigned long offset);
  62
  63 extern void ppc6xx_idle(void);
  64 extern void power4_idle(void);
  65
  66 extern boot_infos_t *boot_infos;
  67 struct ide_machdep_calls ppc_ide_md;
  68
  69 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  70    size value reported by the boot loader. */
  71 unsigned long boot_mem_size;
  72
  73 unsigned long ISA_DMA_THRESHOLD;
  74 unsigned int DMA_MODE_READ;
  75 unsigned int DMA_MODE_WRITE;
  76
  77 #ifdef CONFIG_PPC_MULTIPLATFORM
  78 int _machine = 0;
  79
  80 extern void prep_init(unsigned long r3, unsigned long r4,
  81                 unsigned long r5, unsigned long r6, unsigned long r7);
  82 extern void pmac_init(unsigned long r3, unsigned long r4,
  83                 unsigned long r5, unsigned long r6, unsigned long r7);
  84 extern void chrp_init(unsigned long r3, unsigned long r4,
  85                 unsigned long r5, unsigned long r6, unsigned long r7);
  86
  87 dev_t boot_dev;
  88 #endif /* CONFIG_PPC_MULTIPLATFORM */
  89
  90 int have_of;
  91 EXPORT_SYMBOL(have_of);
  92
  93 #ifdef __DO_IRQ_CANON
  94 int ppc_do_canonicalize_irqs;
  95 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  96 #endif
  97
  98 #ifdef CONFIG_MAGIC_SYSRQ
  99 unsigned long SYSRQ_KEY = 0x54;
 100 #endif /* CONFIG_MAGIC_SYSRQ */
 101
 102 #ifdef CONFIG_VGA_CONSOLE
 103 unsigned long vgacon_remap_base;
 104 #endif
 105
 106 struct machdep_calls ppc_md;
 107
 108 /*
 109  * These are used in binfmt_elf.c to put aux entries on the stack
 110  * for each elf executable being started.
 111  */
 112 int dcache_bsize;
 113 int icache_bsize;
 114 int ucache_bsize;
 115
 116 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 117     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 118 struct screen_info screen_info = {
 119         0, 25,                  /* orig-x, orig-y */
 120         0,                      /* unused */
 121         0,                      /* orig-video-page */
 122         0,                      /* orig-video-mode */
 123         80,                     /* orig-video-cols */
 124         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 125         25,                     /* orig-video-lines */
 126         1,                      /* orig-video-isVGA */
 127         16                      /* orig-video-points */
 128 };
 129 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 130
 131 void machine_restart(char *cmd)
 132 {
 133 #ifdef CONFIG_NVRAM
 134         nvram_sync();
 135 #endif
 136         ppc_md.restart(cmd);
 137 }
 138
 139 void machine_power_off(void)
 140 {
 141 #ifdef CONFIG_NVRAM
 142         nvram_sync();
 143 #endif
 144         ppc_md.power_off();
 145 }
 146
 147 void machine_halt(void)
 148 {
 149 #ifdef CONFIG_NVRAM
 150         nvram_sync();
 151 #endif
 152         ppc_md.halt();
 153 }
 154
 155 void (*pm_power_off)(void) = machine_power_off;
 156
 157 #ifdef CONFIG_TAU
 158 extern u32 cpu_temp(unsigned long cpu);
 159 extern u32 cpu_temp_both(unsigned long cpu);
 160 #endif /* CONFIG_TAU */
 161
 162 int show_cpuinfo(struct seq_file *m, void *v)
 163 {
 164         int i = (int) v - 1;
 165         int err = 0;
 166         unsigned int pvr;
 167         unsigned short maj, min;
 168         unsigned long lpj;
 169
 170         if (i >= NR_CPUS) {
 171                 /* Show summary information */
 172 #ifdef CONFIG_SMP
 173                 unsigned long bogosum = 0;
 174                 for (i = 0; i < NR_CPUS; ++i)
 175                         if (cpu_online(i))
 176                                 bogosum += cpu_data[i].loops_per_jiffy;
 177                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 178                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 179 #endif /* CONFIG_SMP */
 180
 181                 if (ppc_md.show_cpuinfo != NULL)
 182                         err = ppc_md.show_cpuinfo(m);
 183                 return err;
 184         }
 185
 186 #ifdef CONFIG_SMP
 187         if (!cpu_online(i))
 188                 return 0;
 189         pvr = cpu_data[i].pvr;
 190         lpj = cpu_data[i].loops_per_jiffy;
 191 #else
 192         pvr = mfspr(SPRN_PVR);
 193         lpj = loops_per_jiffy;
 194 #endif
 195
 196         seq_printf(m, "processor\t: %d\n", i);
 197         seq_printf(m, "cpu\t\t: ");
 198
 199         if (cur_cpu_spec->pvr_mask)
 200                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 201         else
 202                 seq_printf(m, "unknown (%08x)", pvr);
 203 #ifdef CONFIG_ALTIVEC
 204         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 205                 seq_printf(m, ", altivec supported");
 206 #endif
 207         seq_printf(m, "\n");
 208
 209 #ifdef CONFIG_TAU
 210         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 211 #ifdef CONFIG_TAU_AVERAGE
 212                 /* more straightforward, but potentially misleading */
 213                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 214                            cpu_temp(i));
 215 #else
 216                 /* show the actual temp sensor range */
 217                 u32 temp;
 218                 temp = cpu_temp_both(i);
 219                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 220                            temp & 0xff, temp >> 16);
 221 #endif
 222         }
 223 #endif /* CONFIG_TAU */
 224
 225         if (ppc_md.show_percpuinfo != NULL) {
 226                 err = ppc_md.show_percpuinfo(m, i);
 227                 if (err)
 228                         return err;
 229         }
 230
 231         /* If we are a Freescale core do a simple check so
 232          * we dont have to keep adding cases in the future */
 233         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 234                 maj = PVR_MAJ(pvr);
 235                 min = PVR_MIN(pvr);
 236         } else {
 237                 switch (PVR_VER(pvr)) {
 238                         case 0x0020:    /* 403 family */
 239                                 maj = PVR_MAJ(pvr) + 1;
 240                                 min = PVR_MIN(pvr);
 241                                 break;
 242                         case 0x1008:    /* 740P/750P ?? */
 243                                 maj = ((pvr >> 8) & 0xFF) - 1;
 244                                 min = pvr & 0xFF;
 245                                 break;
 246                         default:
 247                                 maj = (pvr >> 8) & 0xFF;
 248                                 min = pvr & 0xFF;
 249                                 break;
 250                 }
 251         }
 252
 253         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 254                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 255
 256         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 257                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 258
 259 #if USES_PPC_SYS
 260         if (cur_ppc_sys_spec->ppc_sys_name)
 261                 seq_printf(m, "chipset\t\t: %s\n",
 262                         cur_ppc_sys_spec->ppc_sys_name);
 263 #endif
 264
 265 #ifdef CONFIG_SMP
 266         seq_printf(m, "\n");
 267 #endif
 268
 269         return 0;
 270 }
 271
 272 static void *c_start(struct seq_file *m, loff_t *pos)
 273 {
 274         int i = *pos;
 275
 276         return i <= NR_CPUS? (void *) (i + 1): NULL;
 277 }
 278
 279 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 280 {
 281         ++*pos;
 282         return c_start(m, pos);
 283 }
 284
 285 static void c_stop(struct seq_file *m, void *v)
 286 {
 287 }
 288
 289 struct seq_operations cpuinfo_op = {
 290         .start =c_start,
 291         .next = c_next,
 292         .stop = c_stop,
 293         .show = show_cpuinfo,
 294 };
 295
 296 /*
 297  * We're called here very early in the boot.  We determine the machine
 298  * type and call the appropriate low-level setup functions.
 299  *  -- Cort <cort@fsmlabs.com>
 300  *
 301  * Note that the kernel may be running at an address which is different
 302  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 303  * to access static data (including strings).  -- paulus
 304  */
 305 __init
 306 unsigned long
 307 early_init(int r3, int r4, int r5)
 308 {
 309         unsigned long phys;
 310         unsigned long offset = reloc_offset();
 311
 312         /* Default */
 313         phys = offset + KERNELBASE;
 314
 315         /* First zero the BSS -- use memset, some arches don't have
 316          * caches on yet */
 317         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 318
 319         /*
 320          * Identify the CPU type and fix up code sections
 321          * that depend on which cpu we have.
 322          */
 323         identify_cpu(offset, 0);
 324         do_cpu_ftr_fixups(offset);
 325
 326 #if defined(CONFIG_PPC_MULTIPLATFORM)
 327         reloc_got2(offset);
 328
 329         /* If we came here from BootX, clear the screen,
 330          * set up some pointers and return. */
 331         if ((r3 == 0x426f6f58) && (r5 == 0))
 332                 bootx_init(r4, phys);
 333
 334         /*
 335          * don't do anything on prep
 336          * for now, don't use bootinfo because it breaks yaboot 0.5
 337          * and assume that if we didn't find a magic number, we have OF
 338          */
 339         else if (*(unsigned long *)(0) != 0xdeadc0de)
 340                 phys = prom_init(r3, r4, (prom_entry)r5);
 341
 342         reloc_got2(-offset);
 343 #endif
 344
 345         return phys;
 346 }
 347
 348 #ifdef CONFIG_PPC_OF
 349 /*
 350  * Assume here that all clock rates are the same in a
 351  * smp system.  -- Cort
 352  */
 353 int
 354 of_show_percpuinfo(struct seq_file *m, int i)
 355 {
 356         struct device_node *cpu_node;
 357         u32 *fp;
 358         int s;
 359
 360         cpu_node = find_type_devices("cpu");
 361         if (!cpu_node)
 362                 return 0;
 363         for (s = 0; s < i && cpu_node->next; s++)
 364                 cpu_node = cpu_node->next;
 365         fp = (u32 *)get_property(cpu_node, "clock-frequency", NULL);
 366         if (fp)
 367                 seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
 368         return 0;
 369 }
 370
 371 void __init
 372 intuit_machine_type(void)
 373 {
 374         char *model;
 375         struct device_node *root;
 376
 377         /* ask the OF info if we're a chrp or pmac */
 378         root = find_path_device("/");
 379         if (root != 0) {
 380                 /* assume pmac unless proven to be chrp -- Cort */
 381                 _machine = _MACH_Pmac;
 382                 model = get_property(root, "device_type", NULL);
 383                 if (model && !strncmp("chrp", model, 4))
 384                         _machine = _MACH_chrp;
 385                 else {
 386                         model = get_property(root, "model", NULL);
 387                         if (model && !strncmp(model, "IBM", 3))
 388                                 _machine = _MACH_chrp;
 389                 }
 390         }
 391 }
 392 #endif
 393
 394 #ifdef CONFIG_PPC_MULTIPLATFORM
 395 /*
 396  * The PPC_MULTIPLATFORM version of platform_init...
 397  */
 398 void __init
 399 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 400               unsigned long r6, unsigned long r7)
 401 {
 402 #ifdef CONFIG_BOOTX_TEXT
 403         if (boot_text_mapped) {
 404                 btext_clearscreen();
 405                 btext_welcome();
 406         }
 407 #endif
 408
 409         parse_bootinfo(find_bootinfo());
 410
 411         /* if we didn't get any bootinfo telling us what we are... */
 412         if (_machine == 0) {
 413                 /* prep boot loader tells us if we're prep or not */
 414                 if ( *(unsigned long *)(KERNELBASE) == (0xdeadc0de) )
 415                         _machine = _MACH_prep;
 416         }
 417
 418 #ifdef CONFIG_PPC_PREP
 419         /* not much more to do here, if prep */
 420         if (_machine == _MACH_prep) {
 421                 prep_init(r3, r4, r5, r6, r7);
 422                 return;
 423         }
 424 #endif
 425
 426         have_of = 1;
 427
 428         /* prom_init has already been called from __start */
 429         if (boot_infos)
 430                 relocate_nodes();
 431
 432         /* If we aren't PReP, we can find out if we're Pmac
 433          * or CHRP with this. */
 434         if (_machine == 0)
 435                 intuit_machine_type();
 436
 437         /* finish_device_tree may need _machine defined. */
 438         finish_device_tree();
 439
 440         /*
 441          * If we were booted via quik, r3 points to the physical
 442          * address of the command-line parameters.
 443          * If we were booted from an xcoff image (i.e. netbooted or
 444          * booted from floppy), we get the command line from the
 445          * bootargs property of the /chosen node.
 446          * If an initial ramdisk is present, r3 and r4
 447          * are used for initrd_start and initrd_size,
 448          * otherwise they contain 0xdeadbeef.
 449          */
 450         if (r3 >= 0x4000 && r3 < 0x800000 && r4 == 0) {
 451                 strlcpy(cmd_line, (char *)r3 + KERNELBASE,
 452                         sizeof(cmd_line));
 453         } else if (boot_infos != 0) {
 454                 /* booted by BootX - check for ramdisk */
 455                 if (boot_infos->kernelParamsOffset != 0)
 456                         strlcpy(cmd_line, (char *) boot_infos
 457                                 + boot_infos->kernelParamsOffset,
 458                                 sizeof(cmd_line));
 459 #ifdef CONFIG_BLK_DEV_INITRD
 460                 if (boot_infos->ramDisk) {
 461                         initrd_start = (unsigned long) boot_infos
 462                                 + boot_infos->ramDisk;
 463                         initrd_end = initrd_start + boot_infos->ramDiskSize;
 464                         initrd_below_start_ok = 1;
 465                 }
 466 #endif
 467         } else {
 468                 struct device_node *chosen;
 469                 char *p;
 470
 471 #ifdef CONFIG_BLK_DEV_INITRD
 472                 if (r3 && r4 && r4 != 0xdeadbeef) {
 473                         if (r3 < KERNELBASE)
 474                                 r3 += KERNELBASE;
 475                         initrd_start = r3;
 476                         initrd_end = r3 + r4;
 477                         ROOT_DEV = Root_RAM0;
 478                         initrd_below_start_ok = 1;
 479                 }
 480 #endif
 481                 chosen = find_devices("chosen");
 482                 if (chosen != NULL) {
 483                         p = get_property(chosen, "bootargs", NULL);
 484                         if (p && *p) {
 485                                 strlcpy(cmd_line, p, sizeof(cmd_line));
 486                         }
 487                 }
 488         }
 489 #ifdef CONFIG_ADB
 490         if (strstr(cmd_line, "adb_sync")) {
 491                 extern int __adb_probe_sync;
 492                 __adb_probe_sync = 1;
 493         }
 494 #endif /* CONFIG_ADB */
 495
 496         switch (_machine) {
 497 #ifdef CONFIG_PPC_PMAC
 498         case _MACH_Pmac:
 499                 pmac_init(r3, r4, r5, r6, r7);
 500                 break;
 501 #endif
 502 #ifdef CONFIG_PPC_CHRP
 503         case _MACH_chrp:
 504                 chrp_init(r3, r4, r5, r6, r7);
 505                 break;
 506 #endif
 507         }
 508 }
 509
 510 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 511 extern char *of_stdout_device;
 512
 513 static int __init set_preferred_console(void)
 514 {
 515         struct device_node *prom_stdout;
 516         char *name;
 517         int offset = 0;
 518
 519         if (of_stdout_device == NULL)
 520                 return -ENODEV;
 521
 522         /* The user has requested a console so this is already set up. */
 523         if (strstr(saved_command_line, "console="))
 524                 return -EBUSY;
 525
 526         prom_stdout = find_path_device(of_stdout_device);
 527         if (!prom_stdout)
 528                 return -ENODEV;
 529
 530         name = (char *)get_property(prom_stdout, "name", NULL);
 531         if (!name)
 532                 return -ENODEV;
 533
 534         if (strcmp(name, "serial") == 0) {
 535                 int i;
 536                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 537                 if (i > 8) {
 538                         switch (reg[1]) {
 539                                 case 0x3f8:
 540                                         offset = 0;
 541                                         break;
 542                                 case 0x2f8:
 543                                         offset = 1;
 544                                         break;
 545                                 case 0x898:
 546                                         offset = 2;
 547                                         break;
 548                                 case 0x890:
 549                                         offset = 3;
 550                                         break;
 551                                 default:
 552                                         /* We dont recognise the serial port */
 553                                         return -ENODEV;
 554                         }
 555                 }
 556         } else if (strcmp(name, "ch-a") == 0)
 557                 offset = 0;
 558         else if (strcmp(name, "ch-b") == 0)
 559                 offset = 1;
 560         else
 561                 return -ENODEV;
 562         return add_preferred_console("ttyS", offset, NULL);
 563 }
 564 console_initcall(set_preferred_console);
 565 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
 566 #endif /* CONFIG_PPC_MULTIPLATFORM */
 567
 568 struct bi_record *find_bootinfo(void)
 569 {
 570         struct bi_record *rec;
 571
 572         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 573         if ( rec->tag != BI_FIRST ) {
 574                 /*
 575                  * This 0x10000 offset is a terrible hack but it will go away when
 576                  * we have the bootloader handle all the relocation and
 577                  * prom calls -- Cort
 578                  */
 579                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 580                 if ( rec->tag != BI_FIRST )
 581                         return NULL;
 582         }
 583         return rec;
 584 }
 585
 586 void parse_bootinfo(struct bi_record *rec)
 587 {
 588         if (rec == NULL || rec->tag != BI_FIRST)
 589                 return;
 590         while (rec->tag != BI_LAST) {
 591                 ulong *data = rec->data;
 592                 switch (rec->tag) {
 593                 case BI_CMD_LINE:
 594                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 595                         break;
 596 #ifdef CONFIG_BLK_DEV_INITRD
 597                 case BI_INITRD:
 598                         initrd_start = data[0] + KERNELBASE;
 599                         initrd_end = data[0] + data[1] + KERNELBASE;
 600                         break;
 601 #endif /* CONFIG_BLK_DEV_INITRD */
 602 #ifdef CONFIG_PPC_MULTIPLATFORM
 603                 case BI_MACHTYPE:
 604                         _machine = data[0];
 605                         break;
 606 #endif
 607                 case BI_MEMSIZE:
 608                         boot_mem_size = data[0];
 609                         break;
 610                 }
 611                 rec = (struct bi_record *)((ulong)rec + rec->size);
 612         }
 613 }
 614
 615 /*
 616  * Find out what kind of machine we're on and save any data we need
 617  * from the early boot process (devtree is copied on pmac by prom_init()).
 618  * This is called very early on the boot process, after a minimal
 619  * MMU environment has been set up but before MMU_init is called.
 620  */
 621 void __init
 622 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 623              unsigned long r6, unsigned long r7)
 624 {
 625 #ifdef CONFIG_CMDLINE
 626         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 627 #endif /* CONFIG_CMDLINE */
 628
 629 #ifdef CONFIG_6xx
 630         ppc_md.power_save = ppc6xx_idle;
 631 #endif
 632 #ifdef CONFIG_POWER4
 633         ppc_md.power_save = power4_idle;
 634 #endif
 635
 636         platform_init(r3, r4, r5, r6, r7);
 637
 638         if (ppc_md.progress)
 639                 ppc_md.progress("id mach(): done", 0x200);
 640 }
 641 #ifdef CONFIG_BOOKE_WDT
 642 /* Checks wdt=x and wdt_period=xx command-line option */
 643 int __init early_parse_wdt(char *p)
 644 {
 645         if (p && strncmp(p, "0", 1) != 0)
 646                booke_wdt_enabled = 1;
 647
 648         return 0;
 649 }
 650 early_param("wdt", early_parse_wdt);
 651
 652 int __init early_parse_wdt_period (char *p)
 653 {
 654         if (p)
 655                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 656
 657         return 0;
 658 }
 659 early_param("wdt_period", early_parse_wdt_period);
 660 #endif  /* CONFIG_BOOKE_WDT */
 661
 662 /* Checks "l2cr=xxxx" command-line option */
 663 int __init ppc_setup_l2cr(char *str)
 664 {
 665         if (cpu_has_feature(CPU_FTR_L2CR)) {
 666                 unsigned long val = simple_strtoul(str, NULL, 0);
 667                 printk(KERN_INFO "l2cr set to %lx\n", val);
 668                 _set_L2CR(0);           /* force invalidate by disable cache */
 669                 _set_L2CR(val);         /* and enable it */
 670         }
 671         return 1;
 672 }
 673 __setup("l2cr=", ppc_setup_l2cr);
 674
 675 #ifdef CONFIG_GENERIC_NVRAM
 676
 677 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 678 unsigned char nvram_read_byte(int addr)
 679 {
 680         if (ppc_md.nvram_read_val)
 681                 return ppc_md.nvram_read_val(addr);
 682         return 0xff;
 683 }
 684 EXPORT_SYMBOL(nvram_read_byte);
 685
 686 void nvram_write_byte(unsigned char val, int addr)
 687 {
 688         if (ppc_md.nvram_write_val)
 689                 ppc_md.nvram_write_val(addr, val);
 690 }
 691 EXPORT_SYMBOL(nvram_write_byte);
 692
 693 void nvram_sync(void)
 694 {
 695         if (ppc_md.nvram_sync)
 696                 ppc_md.nvram_sync();
 697 }
 698 EXPORT_SYMBOL(nvram_sync);
 699
 700 #endif /* CONFIG_NVRAM */
 701
 702 static struct cpu cpu_devices[NR_CPUS];
 703
 704 int __init ppc_init(void)
 705 {
 706         int i;
 707
 708         /* clear the progress line */
 709         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 710
 711         /* register CPU devices */
 712         for (i = 0; i < NR_CPUS; i++)
 713                 if (cpu_possible(i))
 714                         register_cpu(&cpu_devices[i], i, NULL);
 715
 716         /* call platform init */
 717         if (ppc_md.init != NULL) {
 718                 ppc_md.init();
 719         }
 720         return 0;
 721 }
 722
 723 arch_initcall(ppc_init);
 724
 725 /* Warning, IO base is not yet inited */
 726 void __init setup_arch(char **cmdline_p)
 727 {
 728         extern char *klimit;
 729         extern void do_init_bootmem(void);
 730
 731         /* so udelay does something sensible, assume <= 1000 bogomips */
 732         loops_per_jiffy = 500000000 / HZ;
 733
 734 #ifdef CONFIG_PPC_MULTIPLATFORM
 735         /* This could be called "early setup arch", it must be done
 736          * now because xmon need it
 737          */
 738         if (_machine == _MACH_Pmac)
 739                 pmac_feature_init();    /* New cool way */
 740 #endif
 741
 742 #ifdef CONFIG_XMON
 743         xmon_init(1);
 744         if (strstr(cmd_line, "xmon"))
 745                 xmon(NULL);
 746 #endif /* CONFIG_XMON */
 747         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 748
 749 #if defined(CONFIG_KGDB)
 750         if (ppc_md.kgdb_map_scc)
 751                 ppc_md.kgdb_map_scc();
 752         set_debug_traps();
 753         if (strstr(cmd_line, "gdb")) {
 754                 if (ppc_md.progress)
 755                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 756                 printk("kgdb breakpoint activated\n");
 757                 breakpoint();
 758         }
 759 #endif
 760
 761         /*
 762          * Set cache line size based on type of cpu as a default.
 763          * Systems with OF can look in the properties on the cpu node(s)
 764          * for a possibly more accurate value.
 765          */
 766         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 767                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 768                 icache_bsize = cur_cpu_spec->icache_bsize;
 769                 ucache_bsize = 0;
 770         } else
 771                 ucache_bsize = dcache_bsize = icache_bsize
 772                         = cur_cpu_spec->dcache_bsize;
 773
 774         /* reboot on panic */
 775         panic_timeout = 180;
 776
 777         init_mm.start_code = PAGE_OFFSET;
 778         init_mm.end_code = (unsigned long) _etext;
 779         init_mm.end_data = (unsigned long) _edata;
 780         init_mm.brk = (unsigned long) klimit;
 781
 782         /* Save unparsed command line copy for /proc/cmdline */
 783         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 784         *cmdline_p = cmd_line;
 785
 786         parse_early_param();
 787
 788         /* set up the bootmem stuff with available memory */
 789         do_init_bootmem();
 790         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 791
 792 #ifdef CONFIG_PPC_OCP
 793         /* Initialize OCP device list */
 794         ocp_early_init();
 795         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 796 #endif
 797
 798 #ifdef CONFIG_DUMMY_CONSOLE
 799         conswitchp = &dummy_con;
 800 #endif
 801
 802         ppc_md.setup_arch();
 803         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 804
 805         paging_init();
 806
 807         /* this is for modules since _machine can be a define -- Cort */
 808         ppc_md.ppc_machine = _machine;
 809 }