arch/ppc/kernel/setup.c

   1 /*
   2  * Common prep boot and setup code.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/string.h>
   7 #include <linux/sched.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/reboot.h>
  11 #include <linux/delay.h>
  12 #include <linux/initrd.h>
  13 #include <linux/ide.h>
  14 #include <linux/screen_info.h>
  15 #include <linux/bootmem.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/root_dev.h>
  18 #include <linux/cpu.h>
  19 #include <linux/console.h>
  20
  21 #include <asm/residual.h>
  22 #include <asm/io.h>
  23 #include <asm/prom.h>
  24 #include <asm/processor.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/bootinfo.h>
  27 #include <asm/setup.h>
  28 #include <asm/smp.h>
  29 #include <asm/elf.h>
  30 #include <asm/cputable.h>
  31 #include <asm/bootx.h>
  32 #include <asm/btext.h>
  33 #include <asm/machdep.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/system.h>
  36 #include <asm/sections.h>
  37 #include <asm/nvram.h>
  38 #include <asm/xmon.h>
  39 #include <asm/ocp.h>
  40 #include <asm/prom.h>
  41
  42 #define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
  43                       defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
  44                       defined(CONFIG_PPC_MPC52xx))
  45
  46 #if USES_PPC_SYS
  47 #include <asm/ppc_sys.h>
  48 #endif
  49
  50 #if defined CONFIG_KGDB
  51 #include <asm/kgdb.h>
  52 #endif
  53
  54 extern void platform_init(unsigned long r3, unsigned long r4,
  55                 unsigned long r5, unsigned long r6, unsigned long r7);
  56 extern void reloc_got2(unsigned long offset);
  57
  58 extern void ppc6xx_idle(void);
  59 extern void power4_idle(void);
  60
  61 extern boot_infos_t *boot_infos;
  62 struct ide_machdep_calls ppc_ide_md;
  63
  64 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  65    size value reported by the boot loader. */
  66 unsigned long boot_mem_size;
  67
  68 unsigned long ISA_DMA_THRESHOLD;
  69 unsigned int DMA_MODE_READ;
  70 unsigned int DMA_MODE_WRITE;
  71
  72 #ifdef CONFIG_PPC_PREP
  73 extern void prep_init(unsigned long r3, unsigned long r4,
  74                 unsigned long r5, unsigned long r6, unsigned long r7);
  75
  76 dev_t boot_dev;
  77 #endif /* CONFIG_PPC_PREP */
  78
  79 int have_of;
  80 EXPORT_SYMBOL(have_of);
  81
  82 #ifdef __DO_IRQ_CANON
  83 int ppc_do_canonicalize_irqs;
  84 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  85 #endif
  86
  87 #ifdef CONFIG_VGA_CONSOLE
  88 unsigned long vgacon_remap_base;
  89 #endif
  90
  91 struct machdep_calls ppc_md;
  92
  93 /*
  94  * These are used in binfmt_elf.c to put aux entries on the stack
  95  * for each elf executable being started.
  96  */
  97 int dcache_bsize;
  98 int icache_bsize;
  99 int ucache_bsize;
 100
 101 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 102     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 103 struct screen_info screen_info = {
 104         0, 25,                  /* orig-x, orig-y */
 105         0,                      /* unused */
 106         0,                      /* orig-video-page */
 107         0,                      /* orig-video-mode */
 108         80,                     /* orig-video-cols */
 109         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 110         25,                     /* orig-video-lines */
 111         1,                      /* orig-video-isVGA */
 112         16                      /* orig-video-points */
 113 };
 114 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 115
 116 void machine_restart(char *cmd)
 117 {
 118 #ifdef CONFIG_NVRAM
 119         nvram_sync();
 120 #endif
 121         ppc_md.restart(cmd);
 122 }
 123
 124 static void ppc_generic_power_off(void)
 125 {
 126         ppc_md.power_off();
 127 }
 128
 129 void machine_halt(void)
 130 {
 131 #ifdef CONFIG_NVRAM
 132         nvram_sync();
 133 #endif
 134         ppc_md.halt();
 135 }
 136
 137 void (*pm_power_off)(void) = ppc_generic_power_off;
 138
 139 void machine_power_off(void)
 140 {
 141 #ifdef CONFIG_NVRAM
 142         nvram_sync();
 143 #endif
 144         if (pm_power_off)
 145                 pm_power_off();
 146         ppc_generic_power_off();
 147 }
 148
 149 #ifdef CONFIG_TAU
 150 extern u32 cpu_temp(unsigned long cpu);
 151 extern u32 cpu_temp_both(unsigned long cpu);
 152 #endif /* CONFIG_TAU */
 153
 154 int show_cpuinfo(struct seq_file *m, void *v)
 155 {
 156         int i = (int) v - 1;
 157         int err = 0;
 158         unsigned int pvr;
 159         unsigned short maj, min;
 160         unsigned long lpj;
 161
 162         if (i >= NR_CPUS) {
 163                 /* Show summary information */
 164 #ifdef CONFIG_SMP
 165                 unsigned long bogosum = 0;
 166                 for_each_online_cpu(i)
 167                         bogosum += cpu_data[i].loops_per_jiffy;
 168                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 169                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 170 #endif /* CONFIG_SMP */
 171
 172                 if (ppc_md.show_cpuinfo != NULL)
 173                         err = ppc_md.show_cpuinfo(m);
 174                 return err;
 175         }
 176
 177 #ifdef CONFIG_SMP
 178         if (!cpu_online(i))
 179                 return 0;
 180         pvr = cpu_data[i].pvr;
 181         lpj = cpu_data[i].loops_per_jiffy;
 182 #else
 183         pvr = mfspr(SPRN_PVR);
 184         lpj = loops_per_jiffy;
 185 #endif
 186
 187         seq_printf(m, "processor\t: %d\n", i);
 188         seq_printf(m, "cpu\t\t: ");
 189
 190         if (cur_cpu_spec->pvr_mask)
 191                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 192         else
 193                 seq_printf(m, "unknown (%08x)", pvr);
 194 #ifdef CONFIG_ALTIVEC
 195         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 196                 seq_printf(m, ", altivec supported");
 197 #endif
 198         seq_printf(m, "\n");
 199
 200 #ifdef CONFIG_TAU
 201         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 202 #ifdef CONFIG_TAU_AVERAGE
 203                 /* more straightforward, but potentially misleading */
 204                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 205                            cpu_temp(i));
 206 #else
 207                 /* show the actual temp sensor range */
 208                 u32 temp;
 209                 temp = cpu_temp_both(i);
 210                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 211                            temp & 0xff, temp >> 16);
 212 #endif
 213         }
 214 #endif /* CONFIG_TAU */
 215
 216         if (ppc_md.show_percpuinfo != NULL) {
 217                 err = ppc_md.show_percpuinfo(m, i);
 218                 if (err)
 219                         return err;
 220         }
 221
 222         /* If we are a Freescale core do a simple check so
 223          * we dont have to keep adding cases in the future */
 224         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 225                 maj = PVR_MAJ(pvr);
 226                 min = PVR_MIN(pvr);
 227         } else {
 228                 switch (PVR_VER(pvr)) {
 229                         case 0x0020:    /* 403 family */
 230                                 maj = PVR_MAJ(pvr) + 1;
 231                                 min = PVR_MIN(pvr);
 232                                 break;
 233                         case 0x1008:    /* 740P/750P ?? */
 234                                 maj = ((pvr >> 8) & 0xFF) - 1;
 235                                 min = pvr & 0xFF;
 236                                 break;
 237                         default:
 238                                 maj = (pvr >> 8) & 0xFF;
 239                                 min = pvr & 0xFF;
 240                                 break;
 241                 }
 242         }
 243
 244         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 245                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 246
 247         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 248                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 249
 250 #if USES_PPC_SYS
 251         if (cur_ppc_sys_spec->ppc_sys_name)
 252                 seq_printf(m, "chipset\t\t: %s\n",
 253                         cur_ppc_sys_spec->ppc_sys_name);
 254 #endif
 255
 256 #ifdef CONFIG_SMP
 257         seq_printf(m, "\n");
 258 #endif
 259
 260         return 0;
 261 }
 262
 263 static void *c_start(struct seq_file *m, loff_t *pos)
 264 {
 265         int i = *pos;
 266
 267         return i <= NR_CPUS? (void *) (i + 1): NULL;
 268 }
 269
 270 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 271 {
 272         ++*pos;
 273         return c_start(m, pos);
 274 }
 275
 276 static void c_stop(struct seq_file *m, void *v)
 277 {
 278 }
 279
 280 struct seq_operations cpuinfo_op = {
 281         .start =c_start,
 282         .next = c_next,
 283         .stop = c_stop,
 284         .show = show_cpuinfo,
 285 };
 286
 287 /*
 288  * We're called here very early in the boot.  We determine the machine
 289  * type and call the appropriate low-level setup functions.
 290  *  -- Cort <cort@fsmlabs.com>
 291  *
 292  * Note that the kernel may be running at an address which is different
 293  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 294  * to access static data (including strings).  -- paulus
 295  */
 296 __init
 297 unsigned long
 298 early_init(int r3, int r4, int r5)
 299 {
 300         unsigned long phys;
 301         unsigned long offset = reloc_offset();
 302         struct cpu_spec *spec;
 303
 304         /* Default */
 305         phys = offset + KERNELBASE;
 306
 307         /* First zero the BSS -- use memset, some arches don't have
 308          * caches on yet */
 309         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 310
 311         /*
 312          * Identify the CPU type and fix up code sections
 313          * that depend on which cpu we have.
 314          */
 315         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 316         do_feature_fixups(spec->cpu_features,
 317                           PTRRELOC(&__start___ftr_fixup),
 318                           PTRRELOC(&__stop___ftr_fixup));
 319
 320         return phys;
 321 }
 322
 323 #ifdef CONFIG_PPC_PREP
 324 /*
 325  * The PPC_PREP version of platform_init...
 326  */
 327 void __init
 328 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 329               unsigned long r6, unsigned long r7)
 330 {
 331 #ifdef CONFIG_BOOTX_TEXT
 332         if (boot_text_mapped) {
 333                 btext_clearscreen();
 334                 btext_welcome();
 335         }
 336 #endif
 337
 338         parse_bootinfo(find_bootinfo());
 339
 340         prep_init(r3, r4, r5, r6, r7);
 341 }
 342 #endif /* CONFIG_PPC_PREP */
 343
 344 struct bi_record *find_bootinfo(void)
 345 {
 346         struct bi_record *rec;
 347
 348         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 349         if ( rec->tag != BI_FIRST ) {
 350                 /*
 351                  * This 0x10000 offset is a terrible hack but it will go away when
 352                  * we have the bootloader handle all the relocation and
 353                  * prom calls -- Cort
 354                  */
 355                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 356                 if ( rec->tag != BI_FIRST )
 357                         return NULL;
 358         }
 359         return rec;
 360 }
 361
 362 void parse_bootinfo(struct bi_record *rec)
 363 {
 364         if (rec == NULL || rec->tag != BI_FIRST)
 365                 return;
 366         while (rec->tag != BI_LAST) {
 367                 ulong *data = rec->data;
 368                 switch (rec->tag) {
 369                 case BI_CMD_LINE:
 370                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 371                         break;
 372 #ifdef CONFIG_BLK_DEV_INITRD
 373                 case BI_INITRD:
 374                         initrd_start = data[0] + KERNELBASE;
 375                         initrd_end = data[0] + data[1] + KERNELBASE;
 376                         break;
 377 #endif /* CONFIG_BLK_DEV_INITRD */
 378                 case BI_MEMSIZE:
 379                         boot_mem_size = data[0];
 380                         break;
 381                 }
 382                 rec = (struct bi_record *)((ulong)rec + rec->size);
 383         }
 384 }
 385
 386 /*
 387  * Find out what kind of machine we're on and save any data we need
 388  * from the early boot process (devtree is copied on pmac by prom_init()).
 389  * This is called very early on the boot process, after a minimal
 390  * MMU environment has been set up but before MMU_init is called.
 391  */
 392 void __init
 393 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 394              unsigned long r6, unsigned long r7)
 395 {
 396 #ifdef CONFIG_CMDLINE
 397         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 398 #endif /* CONFIG_CMDLINE */
 399
 400 #ifdef CONFIG_6xx
 401         ppc_md.power_save = ppc6xx_idle;
 402 #endif
 403
 404         platform_init(r3, r4, r5, r6, r7);
 405
 406         if (ppc_md.progress)
 407                 ppc_md.progress("id mach(): done", 0x200);
 408 }
 409 #ifdef CONFIG_BOOKE_WDT
 410 /* Checks wdt=x and wdt_period=xx command-line option */
 411 int __init early_parse_wdt(char *p)
 412 {
 413         if (p && strncmp(p, "0", 1) != 0)
 414                booke_wdt_enabled = 1;
 415
 416         return 0;
 417 }
 418 early_param("wdt", early_parse_wdt);
 419
 420 int __init early_parse_wdt_period (char *p)
 421 {
 422         if (p)
 423                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 424
 425         return 0;
 426 }
 427 early_param("wdt_period", early_parse_wdt_period);
 428 #endif  /* CONFIG_BOOKE_WDT */
 429
 430 /* Checks "l2cr=xxxx" command-line option */
 431 int __init ppc_setup_l2cr(char *str)
 432 {
 433         if (cpu_has_feature(CPU_FTR_L2CR)) {
 434                 unsigned long val = simple_strtoul(str, NULL, 0);
 435                 printk(KERN_INFO "l2cr set to %lx\n", val);
 436                 _set_L2CR(0);           /* force invalidate by disable cache */
 437                 _set_L2CR(val);         /* and enable it */
 438         }
 439         return 1;
 440 }
 441 __setup("l2cr=", ppc_setup_l2cr);
 442
 443 #ifdef CONFIG_GENERIC_NVRAM
 444
 445 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 446 unsigned char nvram_read_byte(int addr)
 447 {
 448         if (ppc_md.nvram_read_val)
 449                 return ppc_md.nvram_read_val(addr);
 450         return 0xff;
 451 }
 452 EXPORT_SYMBOL(nvram_read_byte);
 453
 454 void nvram_write_byte(unsigned char val, int addr)
 455 {
 456         if (ppc_md.nvram_write_val)
 457                 ppc_md.nvram_write_val(addr, val);
 458 }
 459 EXPORT_SYMBOL(nvram_write_byte);
 460
 461 void nvram_sync(void)
 462 {
 463         if (ppc_md.nvram_sync)
 464                 ppc_md.nvram_sync();
 465 }
 466 EXPORT_SYMBOL(nvram_sync);
 467
 468 #endif /* CONFIG_NVRAM */
 469
 470 static struct cpu cpu_devices[NR_CPUS];
 471
 472 int __init ppc_init(void)
 473 {
 474         int i;
 475
 476         /* clear the progress line */
 477         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 478
 479         /* register CPU devices */
 480         for_each_possible_cpu(i)
 481                 register_cpu(&cpu_devices[i], i);
 482
 483         /* call platform init */
 484         if (ppc_md.init != NULL) {
 485                 ppc_md.init();
 486         }
 487         return 0;
 488 }
 489
 490 arch_initcall(ppc_init);
 491
 492 /* Warning, IO base is not yet inited */
 493 void __init setup_arch(char **cmdline_p)
 494 {
 495         extern char *klimit;
 496         extern void do_init_bootmem(void);
 497
 498         /* so udelay does something sensible, assume <= 1000 bogomips */
 499         loops_per_jiffy = 500000000 / HZ;
 500
 501         if (ppc_md.init_early)
 502                 ppc_md.init_early();
 503
 504 #ifdef CONFIG_XMON
 505         xmon_init(1);
 506         if (strstr(cmd_line, "xmon"))
 507                 xmon(NULL);
 508 #endif /* CONFIG_XMON */
 509         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 510
 511 #if defined(CONFIG_KGDB)
 512         if (ppc_md.kgdb_map_scc)
 513                 ppc_md.kgdb_map_scc();
 514         set_debug_traps();
 515         if (strstr(cmd_line, "gdb")) {
 516                 if (ppc_md.progress)
 517                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 518                 printk("kgdb breakpoint activated\n");
 519                 breakpoint();
 520         }
 521 #endif
 522
 523         /*
 524          * Set cache line size based on type of cpu as a default.
 525          * Systems with OF can look in the properties on the cpu node(s)
 526          * for a possibly more accurate value.
 527          */
 528         if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
 529                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 530                 icache_bsize = cur_cpu_spec->icache_bsize;
 531                 ucache_bsize = 0;
 532         } else
 533                 ucache_bsize = dcache_bsize = icache_bsize
 534                         = cur_cpu_spec->dcache_bsize;
 535
 536         /* reboot on panic */
 537         panic_timeout = 180;
 538
 539         init_mm.start_code = PAGE_OFFSET;
 540         init_mm.end_code = (unsigned long) _etext;
 541         init_mm.end_data = (unsigned long) _edata;
 542         init_mm.brk = (unsigned long) klimit;
 543
 544         /* Save unparsed command line copy for /proc/cmdline */
 545         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 546         *cmdline_p = cmd_line;
 547
 548         parse_early_param();
 549
 550         /* set up the bootmem stuff with available memory */
 551         do_init_bootmem();
 552         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 553
 554 #ifdef CONFIG_PPC_OCP
 555         /* Initialize OCP device list */
 556         ocp_early_init();
 557         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 558 #endif
 559
 560 #ifdef CONFIG_DUMMY_CONSOLE
 561         conswitchp = &dummy_con;
 562 #endif
 563
 564         ppc_md.setup_arch();
 565         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 566
 567         paging_init();
 568 }