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
  41 #define USES_PPC_SYS (defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
  42                       defined(CONFIG_PPC_MPC52xx))
  43
  44 #if USES_PPC_SYS
  45 #include <asm/ppc_sys.h>
  46 #endif
  47
  48 #if defined CONFIG_KGDB
  49 #include <asm/kgdb.h>
  50 #endif
  51
  52 extern void platform_init(unsigned long r3, unsigned long r4,
  53                 unsigned long r5, unsigned long r6, unsigned long r7);
  54 extern void reloc_got2(unsigned long offset);
  55
  56 extern void ppc6xx_idle(void);
  57 extern void power4_idle(void);
  58
  59 extern boot_infos_t *boot_infos;
  60 struct ide_machdep_calls ppc_ide_md;
  61
  62 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  63    size value reported by the boot loader. */
  64 unsigned long boot_mem_size;
  65
  66 unsigned long ISA_DMA_THRESHOLD;
  67 unsigned int DMA_MODE_READ;
  68 unsigned int DMA_MODE_WRITE;
  69
  70 #ifdef CONFIG_PPC_PREP
  71 extern void prep_init(unsigned long r3, unsigned long r4,
  72                 unsigned long r5, unsigned long r6, unsigned long r7);
  73
  74 dev_t boot_dev;
  75 #endif /* CONFIG_PPC_PREP */
  76
  77 int have_of;
  78 EXPORT_SYMBOL(have_of);
  79
  80 #ifdef __DO_IRQ_CANON
  81 int ppc_do_canonicalize_irqs;
  82 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  83 #endif
  84
  85 #ifdef CONFIG_VGA_CONSOLE
  86 unsigned long vgacon_remap_base;
  87 #endif
  88
  89 struct machdep_calls ppc_md;
  90
  91 /*
  92  * These are used in binfmt_elf.c to put aux entries on the stack
  93  * for each elf executable being started.
  94  */
  95 int dcache_bsize;
  96 int icache_bsize;
  97 int ucache_bsize;
  98
  99 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 100     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 101 struct screen_info screen_info = {
 102         0, 25,                  /* orig-x, orig-y */
 103         0,                      /* unused */
 104         0,                      /* orig-video-page */
 105         0,                      /* orig-video-mode */
 106         80,                     /* orig-video-cols */
 107         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 108         25,                     /* orig-video-lines */
 109         1,                      /* orig-video-isVGA */
 110         16                      /* orig-video-points */
 111 };
 112 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 113
 114 void machine_restart(char *cmd)
 115 {
 116 #ifdef CONFIG_NVRAM
 117         nvram_sync();
 118 #endif
 119         ppc_md.restart(cmd);
 120 }
 121
 122 static void ppc_generic_power_off(void)
 123 {
 124         ppc_md.power_off();
 125 }
 126
 127 void machine_halt(void)
 128 {
 129 #ifdef CONFIG_NVRAM
 130         nvram_sync();
 131 #endif
 132         ppc_md.halt();
 133 }
 134
 135 void (*pm_power_off)(void) = ppc_generic_power_off;
 136
 137 void machine_power_off(void)
 138 {
 139 #ifdef CONFIG_NVRAM
 140         nvram_sync();
 141 #endif
 142         if (pm_power_off)
 143                 pm_power_off();
 144         ppc_generic_power_off();
 145 }
 146
 147 #ifdef CONFIG_TAU
 148 extern u32 cpu_temp(unsigned long cpu);
 149 extern u32 cpu_temp_both(unsigned long cpu);
 150 #endif /* CONFIG_TAU */
 151
 152 int show_cpuinfo(struct seq_file *m, void *v)
 153 {
 154         int i = (int) v - 1;
 155         int err = 0;
 156         unsigned int pvr;
 157         unsigned short maj, min;
 158         unsigned long lpj;
 159
 160         if (i >= NR_CPUS) {
 161                 /* Show summary information */
 162 #ifdef CONFIG_SMP
 163                 unsigned long bogosum = 0;
 164                 for_each_online_cpu(i)
 165                         bogosum += cpu_data[i].loops_per_jiffy;
 166                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 167                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 168 #endif /* CONFIG_SMP */
 169
 170                 if (ppc_md.show_cpuinfo != NULL)
 171                         err = ppc_md.show_cpuinfo(m);
 172                 return err;
 173         }
 174
 175 #ifdef CONFIG_SMP
 176         if (!cpu_online(i))
 177                 return 0;
 178         pvr = cpu_data[i].pvr;
 179         lpj = cpu_data[i].loops_per_jiffy;
 180 #else
 181         pvr = mfspr(SPRN_PVR);
 182         lpj = loops_per_jiffy;
 183 #endif
 184
 185         seq_printf(m, "processor\t: %d\n", i);
 186         seq_printf(m, "cpu\t\t: ");
 187
 188         if (cur_cpu_spec->pvr_mask)
 189                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 190         else
 191                 seq_printf(m, "unknown (%08x)", pvr);
 192 #ifdef CONFIG_ALTIVEC
 193         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 194                 seq_printf(m, ", altivec supported");
 195 #endif
 196         seq_printf(m, "\n");
 197
 198 #ifdef CONFIG_TAU
 199         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 200 #ifdef CONFIG_TAU_AVERAGE
 201                 /* more straightforward, but potentially misleading */
 202                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 203                            cpu_temp(i));
 204 #else
 205                 /* show the actual temp sensor range */
 206                 u32 temp;
 207                 temp = cpu_temp_both(i);
 208                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 209                            temp & 0xff, temp >> 16);
 210 #endif
 211         }
 212 #endif /* CONFIG_TAU */
 213
 214         if (ppc_md.show_percpuinfo != NULL) {
 215                 err = ppc_md.show_percpuinfo(m, i);
 216                 if (err)
 217                         return err;
 218         }
 219
 220         /* If we are a Freescale core do a simple check so
 221          * we dont have to keep adding cases in the future */
 222         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 223                 maj = PVR_MAJ(pvr);
 224                 min = PVR_MIN(pvr);
 225         } else {
 226                 switch (PVR_VER(pvr)) {
 227                         case 0x0020:    /* 403 family */
 228                                 maj = PVR_MAJ(pvr) + 1;
 229                                 min = PVR_MIN(pvr);
 230                                 break;
 231                         case 0x1008:    /* 740P/750P ?? */
 232                                 maj = ((pvr >> 8) & 0xFF) - 1;
 233                                 min = pvr & 0xFF;
 234                                 break;
 235                         default:
 236                                 maj = (pvr >> 8) & 0xFF;
 237                                 min = pvr & 0xFF;
 238                                 break;
 239                 }
 240         }
 241
 242         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 243                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 244
 245         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 246                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 247
 248 #if USES_PPC_SYS
 249         if (cur_ppc_sys_spec->ppc_sys_name)
 250                 seq_printf(m, "chipset\t\t: %s\n",
 251                         cur_ppc_sys_spec->ppc_sys_name);
 252 #endif
 253
 254 #ifdef CONFIG_SMP
 255         seq_printf(m, "\n");
 256 #endif
 257
 258         return 0;
 259 }
 260
 261 static void *c_start(struct seq_file *m, loff_t *pos)
 262 {
 263         int i = *pos;
 264
 265         return i <= NR_CPUS? (void *) (i + 1): NULL;
 266 }
 267
 268 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 269 {
 270         ++*pos;
 271         return c_start(m, pos);
 272 }
 273
 274 static void c_stop(struct seq_file *m, void *v)
 275 {
 276 }
 277
 278 const struct seq_operations cpuinfo_op = {
 279         .start =c_start,
 280         .next = c_next,
 281         .stop = c_stop,
 282         .show = show_cpuinfo,
 283 };
 284
 285 /*
 286  * We're called here very early in the boot.  We determine the machine
 287  * type and call the appropriate low-level setup functions.
 288  *  -- Cort <cort@fsmlabs.com>
 289  *
 290  * Note that the kernel may be running at an address which is different
 291  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 292  * to access static data (including strings).  -- paulus
 293  */
 294 __init
 295 unsigned long
 296 early_init(int r3, int r4, int r5)
 297 {
 298         unsigned long phys;
 299         unsigned long offset = reloc_offset();
 300         struct cpu_spec *spec;
 301
 302         /* Default */
 303         phys = offset + KERNELBASE;
 304
 305         /* First zero the BSS -- use memset, some arches don't have
 306          * caches on yet */
 307         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 308
 309         /*
 310          * Identify the CPU type and fix up code sections
 311          * that depend on which cpu we have.
 312          */
 313 #if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
 314         /* We pass the virtual PVR here for 440EP as 440EP and 440GR have
 315          * identical PVRs and there is no reliable way to check for the FPU
 316          */
 317         spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
 318 #else
 319         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 320 #endif
 321         do_feature_fixups(spec->cpu_features,
 322                           PTRRELOC(&__start___ftr_fixup),
 323                           PTRRELOC(&__stop___ftr_fixup));
 324
 325         return phys;
 326 }
 327
 328 #ifdef CONFIG_PPC_PREP
 329 /*
 330  * The PPC_PREP version of platform_init...
 331  */
 332 void __init
 333 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 334               unsigned long r6, unsigned long r7)
 335 {
 336 #ifdef CONFIG_BOOTX_TEXT
 337         if (boot_text_mapped) {
 338                 btext_clearscreen();
 339                 btext_welcome();
 340         }
 341 #endif
 342
 343         parse_bootinfo(find_bootinfo());
 344
 345         prep_init(r3, r4, r5, r6, r7);
 346 }
 347 #endif /* CONFIG_PPC_PREP */
 348
 349 struct bi_record *find_bootinfo(void)
 350 {
 351         struct bi_record *rec;
 352
 353         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 354         if ( rec->tag != BI_FIRST ) {
 355                 /*
 356                  * This 0x10000 offset is a terrible hack but it will go away when
 357                  * we have the bootloader handle all the relocation and
 358                  * prom calls -- Cort
 359                  */
 360                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 361                 if ( rec->tag != BI_FIRST )
 362                         return NULL;
 363         }
 364         return rec;
 365 }
 366
 367 void parse_bootinfo(struct bi_record *rec)
 368 {
 369         if (rec == NULL || rec->tag != BI_FIRST)
 370                 return;
 371         while (rec->tag != BI_LAST) {
 372                 ulong *data = rec->data;
 373                 switch (rec->tag) {
 374                 case BI_CMD_LINE:
 375                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 376                         break;
 377 #ifdef CONFIG_BLK_DEV_INITRD
 378                 case BI_INITRD:
 379                         initrd_start = data[0] + KERNELBASE;
 380                         initrd_end = data[0] + data[1] + KERNELBASE;
 381                         break;
 382 #endif /* CONFIG_BLK_DEV_INITRD */
 383                 case BI_MEMSIZE:
 384                         boot_mem_size = data[0];
 385                         break;
 386                 }
 387                 rec = (struct bi_record *)((ulong)rec + rec->size);
 388         }
 389 }
 390
 391 /*
 392  * Find out what kind of machine we're on and save any data we need
 393  * from the early boot process (devtree is copied on pmac by prom_init()).
 394  * This is called very early on the boot process, after a minimal
 395  * MMU environment has been set up but before MMU_init is called.
 396  */
 397 void __init
 398 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 399              unsigned long r6, unsigned long r7)
 400 {
 401 #ifdef CONFIG_CMDLINE
 402         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 403 #endif /* CONFIG_CMDLINE */
 404
 405 #ifdef CONFIG_6xx
 406         ppc_md.power_save = ppc6xx_idle;
 407 #endif
 408
 409         platform_init(r3, r4, r5, r6, r7);
 410
 411         if (ppc_md.progress)
 412                 ppc_md.progress("id mach(): done", 0x200);
 413 }
 414 #ifdef CONFIG_BOOKE_WDT
 415 /* Checks wdt=x and wdt_period=xx command-line option */
 416 int __init early_parse_wdt(char *p)
 417 {
 418         if (p && strncmp(p, "0", 1) != 0)
 419                booke_wdt_enabled = 1;
 420
 421         return 0;
 422 }
 423 early_param("wdt", early_parse_wdt);
 424
 425 int __init early_parse_wdt_period (char *p)
 426 {
 427         if (p)
 428                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 429
 430         return 0;
 431 }
 432 early_param("wdt_period", early_parse_wdt_period);
 433 #endif  /* CONFIG_BOOKE_WDT */
 434
 435 /* Checks "l2cr=xxxx" command-line option */
 436 int __init ppc_setup_l2cr(char *str)
 437 {
 438         if (cpu_has_feature(CPU_FTR_L2CR)) {
 439                 unsigned long val = simple_strtoul(str, NULL, 0);
 440                 printk(KERN_INFO "l2cr set to %lx\n", val);
 441                 _set_L2CR(0);           /* force invalidate by disable cache */
 442                 _set_L2CR(val);         /* and enable it */
 443         }
 444         return 1;
 445 }
 446 __setup("l2cr=", ppc_setup_l2cr);
 447
 448 #ifdef CONFIG_GENERIC_NVRAM
 449
 450 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 451 unsigned char nvram_read_byte(int addr)
 452 {
 453         if (ppc_md.nvram_read_val)
 454                 return ppc_md.nvram_read_val(addr);
 455         return 0xff;
 456 }
 457 EXPORT_SYMBOL(nvram_read_byte);
 458
 459 void nvram_write_byte(unsigned char val, int addr)
 460 {
 461         if (ppc_md.nvram_write_val)
 462                 ppc_md.nvram_write_val(addr, val);
 463 }
 464 EXPORT_SYMBOL(nvram_write_byte);
 465
 466 void nvram_sync(void)
 467 {
 468         if (ppc_md.nvram_sync)
 469                 ppc_md.nvram_sync();
 470 }
 471 EXPORT_SYMBOL(nvram_sync);
 472
 473 #endif /* CONFIG_NVRAM */
 474
 475 static struct cpu cpu_devices[NR_CPUS];
 476
 477 int __init ppc_init(void)
 478 {
 479         int i;
 480
 481         /* clear the progress line */
 482         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 483
 484         /* register CPU devices */
 485         for_each_possible_cpu(i)
 486                 register_cpu(&cpu_devices[i], i);
 487
 488         /* call platform init */
 489         if (ppc_md.init != NULL) {
 490                 ppc_md.init();
 491         }
 492         return 0;
 493 }
 494
 495 arch_initcall(ppc_init);
 496
 497 /* Warning, IO base is not yet inited */
 498 void __init setup_arch(char **cmdline_p)
 499 {
 500         extern char *klimit;
 501         extern void do_init_bootmem(void);
 502
 503         /* so udelay does something sensible, assume <= 1000 bogomips */
 504         loops_per_jiffy = 500000000 / HZ;
 505
 506         if (ppc_md.init_early)
 507                 ppc_md.init_early();
 508
 509 #ifdef CONFIG_XMON
 510         xmon_init(1);
 511         if (strstr(cmd_line, "xmon"))
 512                 xmon(NULL);
 513 #endif /* CONFIG_XMON */
 514         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 515
 516 #if defined(CONFIG_KGDB)
 517         if (ppc_md.kgdb_map_scc)
 518                 ppc_md.kgdb_map_scc();
 519         set_debug_traps();
 520         if (strstr(cmd_line, "gdb")) {
 521                 if (ppc_md.progress)
 522                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 523                 printk("kgdb breakpoint activated\n");
 524                 breakpoint();
 525         }
 526 #endif
 527
 528         /*
 529          * Set cache line size based on type of cpu as a default.
 530          * Systems with OF can look in the properties on the cpu node(s)
 531          * for a possibly more accurate value.
 532          */
 533         if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
 534                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 535                 icache_bsize = cur_cpu_spec->icache_bsize;
 536                 ucache_bsize = 0;
 537         } else
 538                 ucache_bsize = dcache_bsize = icache_bsize
 539                         = cur_cpu_spec->dcache_bsize;
 540
 541         /* reboot on panic */
 542         panic_timeout = 180;
 543
 544         init_mm.start_code = PAGE_OFFSET;
 545         init_mm.end_code = (unsigned long) _etext;
 546         init_mm.end_data = (unsigned long) _edata;
 547         init_mm.brk = (unsigned long) klimit;
 548
 549         /* Save unparsed command line copy for /proc/cmdline */
 550         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 551         *cmdline_p = cmd_line;
 552
 553         parse_early_param();
 554
 555         /* set up the bootmem stuff with available memory */
 556         do_init_bootmem();
 557         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 558
 559 #ifdef CONFIG_PPC_OCP
 560         /* Initialize OCP device list */
 561         ocp_early_init();
 562         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 563 #endif
 564
 565 #ifdef CONFIG_DUMMY_CONSOLE
 566         conswitchp = &dummy_con;
 567 #endif
 568
 569         ppc_md.setup_arch();
 570         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 571
 572         paging_init();
 573 }