arch/ppc/kernel/setup.c

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