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