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 #if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
 316         /* We pass the virtual PVR here for 440EP as 440EP and 440GR have
 317          * identical PVRs and there is no reliable way to check for the FPU
 318          */
 319         spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
 320 #else
 321         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 322 #endif
 323         do_feature_fixups(spec->cpu_features,
 324                           PTRRELOC(&__start___ftr_fixup),
 325                           PTRRELOC(&__stop___ftr_fixup));
 326
 327         return phys;
 328 }
 329
 330 #ifdef CONFIG_PPC_PREP
 331 /*
 332  * The PPC_PREP version of platform_init...
 333  */
 334 void __init
 335 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 336               unsigned long r6, unsigned long r7)
 337 {
 338 #ifdef CONFIG_BOOTX_TEXT
 339         if (boot_text_mapped) {
 340                 btext_clearscreen();
 341                 btext_welcome();
 342         }
 343 #endif
 344
 345         parse_bootinfo(find_bootinfo());
 346
 347         prep_init(r3, r4, r5, r6, r7);
 348 }
 349 #endif /* CONFIG_PPC_PREP */
 350
 351 struct bi_record *find_bootinfo(void)
 352 {
 353         struct bi_record *rec;
 354
 355         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 356         if ( rec->tag != BI_FIRST ) {
 357                 /*
 358                  * This 0x10000 offset is a terrible hack but it will go away when
 359                  * we have the bootloader handle all the relocation and
 360                  * prom calls -- Cort
 361                  */
 362                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 363                 if ( rec->tag != BI_FIRST )
 364                         return NULL;
 365         }
 366         return rec;
 367 }
 368
 369 void parse_bootinfo(struct bi_record *rec)
 370 {
 371         if (rec == NULL || rec->tag != BI_FIRST)
 372                 return;
 373         while (rec->tag != BI_LAST) {
 374                 ulong *data = rec->data;
 375                 switch (rec->tag) {
 376                 case BI_CMD_LINE:
 377                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 378                         break;
 379 #ifdef CONFIG_BLK_DEV_INITRD
 380                 case BI_INITRD:
 381                         initrd_start = data[0] + KERNELBASE;
 382                         initrd_end = data[0] + data[1] + KERNELBASE;
 383                         break;
 384 #endif /* CONFIG_BLK_DEV_INITRD */
 385                 case BI_MEMSIZE:
 386                         boot_mem_size = data[0];
 387                         break;
 388                 }
 389                 rec = (struct bi_record *)((ulong)rec + rec->size);
 390         }
 391 }
 392
 393 /*
 394  * Find out what kind of machine we're on and save any data we need
 395  * from the early boot process (devtree is copied on pmac by prom_init()).
 396  * This is called very early on the boot process, after a minimal
 397  * MMU environment has been set up but before MMU_init is called.
 398  */
 399 void __init
 400 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 401              unsigned long r6, unsigned long r7)
 402 {
 403 #ifdef CONFIG_CMDLINE
 404         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 405 #endif /* CONFIG_CMDLINE */
 406
 407 #ifdef CONFIG_6xx
 408         ppc_md.power_save = ppc6xx_idle;
 409 #endif
 410
 411         platform_init(r3, r4, r5, r6, r7);
 412
 413         if (ppc_md.progress)
 414                 ppc_md.progress("id mach(): done", 0x200);
 415 }
 416 #ifdef CONFIG_BOOKE_WDT
 417 /* Checks wdt=x and wdt_period=xx command-line option */
 418 int __init early_parse_wdt(char *p)
 419 {
 420         if (p && strncmp(p, "0", 1) != 0)
 421                booke_wdt_enabled = 1;
 422
 423         return 0;
 424 }
 425 early_param("wdt", early_parse_wdt);
 426
 427 int __init early_parse_wdt_period (char *p)
 428 {
 429         if (p)
 430                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 431
 432         return 0;
 433 }
 434 early_param("wdt_period", early_parse_wdt_period);
 435 #endif  /* CONFIG_BOOKE_WDT */
 436
 437 /* Checks "l2cr=xxxx" command-line option */
 438 int __init ppc_setup_l2cr(char *str)
 439 {
 440         if (cpu_has_feature(CPU_FTR_L2CR)) {
 441                 unsigned long val = simple_strtoul(str, NULL, 0);
 442                 printk(KERN_INFO "l2cr set to %lx\n", val);
 443                 _set_L2CR(0);           /* force invalidate by disable cache */
 444                 _set_L2CR(val);         /* and enable it */
 445         }
 446         return 1;
 447 }
 448 __setup("l2cr=", ppc_setup_l2cr);
 449
 450 #ifdef CONFIG_GENERIC_NVRAM
 451
 452 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 453 unsigned char nvram_read_byte(int addr)
 454 {
 455         if (ppc_md.nvram_read_val)
 456                 return ppc_md.nvram_read_val(addr);
 457         return 0xff;
 458 }
 459 EXPORT_SYMBOL(nvram_read_byte);
 460
 461 void nvram_write_byte(unsigned char val, int addr)
 462 {
 463         if (ppc_md.nvram_write_val)
 464                 ppc_md.nvram_write_val(addr, val);
 465 }
 466 EXPORT_SYMBOL(nvram_write_byte);
 467
 468 void nvram_sync(void)
 469 {
 470         if (ppc_md.nvram_sync)
 471                 ppc_md.nvram_sync();
 472 }
 473 EXPORT_SYMBOL(nvram_sync);
 474
 475 #endif /* CONFIG_NVRAM */
 476
 477 static struct cpu cpu_devices[NR_CPUS];
 478
 479 int __init ppc_init(void)
 480 {
 481         int i;
 482
 483         /* clear the progress line */
 484         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 485
 486         /* register CPU devices */
 487         for_each_possible_cpu(i)
 488                 register_cpu(&cpu_devices[i], i);
 489
 490         /* call platform init */
 491         if (ppc_md.init != NULL) {
 492                 ppc_md.init();
 493         }
 494         return 0;
 495 }
 496
 497 arch_initcall(ppc_init);
 498
 499 /* Warning, IO base is not yet inited */
 500 void __init setup_arch(char **cmdline_p)
 501 {
 502         extern char *klimit;
 503         extern void do_init_bootmem(void);
 504
 505         /* so udelay does something sensible, assume <= 1000 bogomips */
 506         loops_per_jiffy = 500000000 / HZ;
 507
 508         if (ppc_md.init_early)
 509                 ppc_md.init_early();
 510
 511 #ifdef CONFIG_XMON
 512         xmon_init(1);
 513         if (strstr(cmd_line, "xmon"))
 514                 xmon(NULL);
 515 #endif /* CONFIG_XMON */
 516         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 517
 518 #if defined(CONFIG_KGDB)
 519         if (ppc_md.kgdb_map_scc)
 520                 ppc_md.kgdb_map_scc();
 521         set_debug_traps();
 522         if (strstr(cmd_line, "gdb")) {
 523                 if (ppc_md.progress)
 524                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 525                 printk("kgdb breakpoint activated\n");
 526                 breakpoint();
 527         }
 528 #endif
 529
 530         /*
 531          * Set cache line size based on type of cpu as a default.
 532          * Systems with OF can look in the properties on the cpu node(s)
 533          * for a possibly more accurate value.
 534          */
 535         if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
 536                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 537                 icache_bsize = cur_cpu_spec->icache_bsize;
 538                 ucache_bsize = 0;
 539         } else
 540                 ucache_bsize = dcache_bsize = icache_bsize
 541                         = cur_cpu_spec->dcache_bsize;
 542
 543         /* reboot on panic */
 544         panic_timeout = 180;
 545
 546         init_mm.start_code = PAGE_OFFSET;
 547         init_mm.end_code = (unsigned long) _etext;
 548         init_mm.end_data = (unsigned long) _edata;
 549         init_mm.brk = (unsigned long) klimit;
 550
 551         /* Save unparsed command line copy for /proc/cmdline */
 552         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 553         *cmdline_p = cmd_line;
 554
 555         parse_early_param();
 556
 557         /* set up the bootmem stuff with available memory */
 558         do_init_bootmem();
 559         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 560
 561 #ifdef CONFIG_PPC_OCP
 562         /* Initialize OCP device list */
 563         ocp_early_init();
 564         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 565 #endif
 566
 567 #ifdef CONFIG_DUMMY_CONSOLE
 568         conswitchp = &dummy_con;
 569 #endif
 570
 571         ppc_md.setup_arch();
 572         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 573
 574         paging_init();
 575 }