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/screen_info.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/cpu.h>
  18 #include <linux/console.h>
  19
  20 #include <asm/residual.h>
  21 #include <asm/io.h>
  22 #include <asm/prom.h>
  23 #include <asm/processor.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/bootinfo.h>
  26 #include <asm/setup.h>
  27 #include <asm/smp.h>
  28 #include <asm/elf.h>
  29 #include <asm/cputable.h>
  30 #include <asm/bootx.h>
  31 #include <asm/btext.h>
  32 #include <asm/machdep.h>
  33 #include <asm/uaccess.h>
  34 #include <asm/system.h>
  35 #include <asm/sections.h>
  36 #include <asm/nvram.h>
  37 #include <asm/xmon.h>
  38 #include <asm/ocp.h>
  39 #include <asm/irq.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
  61 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  62    size value reported by the boot loader. */
  63 unsigned long boot_mem_size;
  64
  65 unsigned long ISA_DMA_THRESHOLD;
  66 unsigned int DMA_MODE_READ;
  67 unsigned int DMA_MODE_WRITE;
  68
  69 #ifdef CONFIG_PPC_PREP
  70 extern void prep_init(unsigned long r3, unsigned long r4,
  71                 unsigned long r5, unsigned long r6, unsigned long r7);
  72
  73 dev_t boot_dev;
  74 #endif /* CONFIG_PPC_PREP */
  75
  76 int have_of;
  77 EXPORT_SYMBOL(have_of);
  78
  79 #ifdef __DO_IRQ_CANON
  80 int ppc_do_canonicalize_irqs;
  81 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  82 #endif
  83
  84 #ifdef CONFIG_VGA_CONSOLE
  85 unsigned long vgacon_remap_base;
  86 #endif
  87
  88 struct machdep_calls ppc_md;
  89
  90 /*
  91  * These are used in binfmt_elf.c to put aux entries on the stack
  92  * for each elf executable being started.
  93  */
  94 int dcache_bsize;
  95 int icache_bsize;
  96 int ucache_bsize;
  97
  98 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
  99     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 100 struct screen_info screen_info = {
 101         0, 25,                  /* orig-x, orig-y */
 102         0,                      /* unused */
 103         0,                      /* orig-video-page */
 104         0,                      /* orig-video-mode */
 105         80,                     /* orig-video-cols */
 106         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 107         25,                     /* orig-video-lines */
 108         1,                      /* orig-video-isVGA */
 109         16                      /* orig-video-points */
 110 };
 111 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 112
 113 void machine_restart(char *cmd)
 114 {
 115 #ifdef CONFIG_NVRAM
 116         nvram_sync();
 117 #endif
 118         ppc_md.restart(cmd);
 119 }
 120
 121 static void ppc_generic_power_off(void)
 122 {
 123         ppc_md.power_off();
 124 }
 125
 126 void machine_halt(void)
 127 {
 128 #ifdef CONFIG_NVRAM
 129         nvram_sync();
 130 #endif
 131         ppc_md.halt();
 132 }
 133
 134 void (*pm_power_off)(void) = ppc_generic_power_off;
 135
 136 void machine_power_off(void)
 137 {
 138 #ifdef CONFIG_NVRAM
 139         nvram_sync();
 140 #endif
 141         if (pm_power_off)
 142                 pm_power_off();
 143         ppc_generic_power_off();
 144 }
 145
 146 #ifdef CONFIG_TAU
 147 extern u32 cpu_temp(unsigned long cpu);
 148 extern u32 cpu_temp_both(unsigned long cpu);
 149 #endif /* CONFIG_TAU */
 150
 151 int show_cpuinfo(struct seq_file *m, void *v)
 152 {
 153         int i = (int) v - 1;
 154         int err = 0;
 155         unsigned int pvr;
 156         unsigned short maj, min;
 157         unsigned long lpj;
 158
 159         if (i >= NR_CPUS) {
 160                 /* Show summary information */
 161 #ifdef CONFIG_SMP
 162                 unsigned long bogosum = 0;
 163                 for_each_online_cpu(i)
 164                         bogosum += cpu_data[i].loops_per_jiffy;
 165                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 166                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 167 #endif /* CONFIG_SMP */
 168
 169                 if (ppc_md.show_cpuinfo != NULL)
 170                         err = ppc_md.show_cpuinfo(m);
 171                 return err;
 172         }
 173
 174 #ifdef CONFIG_SMP
 175         if (!cpu_online(i))
 176                 return 0;
 177         pvr = cpu_data[i].pvr;
 178         lpj = cpu_data[i].loops_per_jiffy;
 179 #else
 180         pvr = mfspr(SPRN_PVR);
 181         lpj = loops_per_jiffy;
 182 #endif
 183
 184         seq_printf(m, "processor\t: %d\n", i);
 185         seq_printf(m, "cpu\t\t: ");
 186
 187         if (cur_cpu_spec->pvr_mask)
 188                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 189         else
 190                 seq_printf(m, "unknown (%08x)", pvr);
 191 #ifdef CONFIG_ALTIVEC
 192         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 193                 seq_printf(m, ", altivec supported");
 194 #endif
 195         seq_printf(m, "\n");
 196
 197 #ifdef CONFIG_TAU
 198         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 199 #ifdef CONFIG_TAU_AVERAGE
 200                 /* more straightforward, but potentially misleading */
 201                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 202                            cpu_temp(i));
 203 #else
 204                 /* show the actual temp sensor range */
 205                 u32 temp;
 206                 temp = cpu_temp_both(i);
 207                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 208                            temp & 0xff, temp >> 16);
 209 #endif
 210         }
 211 #endif /* CONFIG_TAU */
 212
 213         if (ppc_md.show_percpuinfo != NULL) {
 214                 err = ppc_md.show_percpuinfo(m, i);
 215                 if (err)
 216                         return err;
 217         }
 218
 219         /* If we are a Freescale core do a simple check so
 220          * we dont have to keep adding cases in the future */
 221         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 222                 maj = PVR_MAJ(pvr);
 223                 min = PVR_MIN(pvr);
 224         } else {
 225                 switch (PVR_VER(pvr)) {
 226                         case 0x0020:    /* 403 family */
 227                                 maj = PVR_MAJ(pvr) + 1;
 228                                 min = PVR_MIN(pvr);
 229                                 break;
 230                         case 0x1008:    /* 740P/750P ?? */
 231                                 maj = ((pvr >> 8) & 0xFF) - 1;
 232                                 min = pvr & 0xFF;
 233                                 break;
 234                         default:
 235                                 maj = (pvr >> 8) & 0xFF;
 236                                 min = pvr & 0xFF;
 237                                 break;
 238                 }
 239         }
 240
 241         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 242                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 243
 244         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 245                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 246
 247 #if USES_PPC_SYS
 248         if (cur_ppc_sys_spec->ppc_sys_name)
 249                 seq_printf(m, "chipset\t\t: %s\n",
 250                         cur_ppc_sys_spec->ppc_sys_name);
 251 #endif
 252
 253 #ifdef CONFIG_SMP
 254         seq_printf(m, "\n");
 255 #endif
 256
 257         return 0;
 258 }
 259
 260 static void *c_start(struct seq_file *m, loff_t *pos)
 261 {
 262         int i = *pos;
 263
 264         return i <= NR_CPUS? (void *) (i + 1): NULL;
 265 }
 266
 267 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 268 {
 269         ++*pos;
 270         return c_start(m, pos);
 271 }
 272
 273 static void c_stop(struct seq_file *m, void *v)
 274 {
 275 }
 276
 277 const struct seq_operations cpuinfo_op = {
 278         .start =c_start,
 279         .next = c_next,
 280         .stop = c_stop,
 281         .show = show_cpuinfo,
 282 };
 283
 284 /*
 285  * We're called here very early in the boot.  We determine the machine
 286  * type and call the appropriate low-level setup functions.
 287  *  -- Cort <cort@fsmlabs.com>
 288  *
 289  * Note that the kernel may be running at an address which is different
 290  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 291  * to access static data (including strings).  -- paulus
 292  */
 293 __init
 294 unsigned long
 295 early_init(int r3, int r4, int r5)
 296 {
 297         unsigned long phys;
 298         unsigned long offset = reloc_offset();
 299         struct cpu_spec *spec;
 300
 301         /* Default */
 302         phys = offset + KERNELBASE;
 303
 304         /* First zero the BSS -- use memset, some arches don't have
 305          * caches on yet */
 306         memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);
 307
 308         /*
 309          * Identify the CPU type and fix up code sections
 310          * that depend on which cpu we have.
 311          */
 312 #if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
 313         /* We pass the virtual PVR here for 440EP as 440EP and 440GR have
 314          * identical PVRs and there is no reliable way to check for the FPU
 315          */
 316         spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
 317 #else
 318         spec = identify_cpu(offset, mfspr(SPRN_PVR));
 319 #endif
 320         do_feature_fixups(spec->cpu_features,
 321                           PTRRELOC(&__start___ftr_fixup),
 322                           PTRRELOC(&__stop___ftr_fixup));
 323
 324         return phys;
 325 }
 326
 327 #ifdef CONFIG_PPC_PREP
 328 /*
 329  * The PPC_PREP version of platform_init...
 330  */
 331 void __init
 332 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 333               unsigned long r6, unsigned long r7)
 334 {
 335 #ifdef CONFIG_BOOTX_TEXT
 336         if (boot_text_mapped) {
 337                 btext_clearscreen();
 338                 btext_welcome();
 339         }
 340 #endif
 341
 342         parse_bootinfo(find_bootinfo());
 343
 344         prep_init(r3, r4, r5, r6, r7);
 345 }
 346 #endif /* CONFIG_PPC_PREP */
 347
 348 struct bi_record *find_bootinfo(void)
 349 {
 350         struct bi_record *rec;
 351
 352         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 353         if ( rec->tag != BI_FIRST ) {
 354                 /*
 355                  * This 0x10000 offset is a terrible hack but it will go away when
 356                  * we have the bootloader handle all the relocation and
 357                  * prom calls -- Cort
 358                  */
 359                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 360                 if ( rec->tag != BI_FIRST )
 361                         return NULL;
 362         }
 363         return rec;
 364 }
 365
 366 void parse_bootinfo(struct bi_record *rec)
 367 {
 368         if (rec == NULL || rec->tag != BI_FIRST)
 369                 return;
 370         while (rec->tag != BI_LAST) {
 371                 ulong *data = rec->data;
 372                 switch (rec->tag) {
 373                 case BI_CMD_LINE:
 374                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 375                         break;
 376 #ifdef CONFIG_BLK_DEV_INITRD
 377                 case BI_INITRD:
 378                         initrd_start = data[0] + KERNELBASE;
 379                         initrd_end = data[0] + data[1] + KERNELBASE;
 380                         break;
 381 #endif /* CONFIG_BLK_DEV_INITRD */
 382                 case BI_MEMSIZE:
 383                         boot_mem_size = data[0];
 384                         break;
 385                 }
 386                 rec = (struct bi_record *)((ulong)rec + rec->size);
 387         }
 388 }
 389
 390 /*
 391  * Find out what kind of machine we're on and save any data we need
 392  * from the early boot process (devtree is copied on pmac by prom_init()).
 393  * This is called very early on the boot process, after a minimal
 394  * MMU environment has been set up but before MMU_init is called.
 395  */
 396 void __init
 397 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 398              unsigned long r6, unsigned long r7)
 399 {
 400 #ifdef CONFIG_CMDLINE
 401         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 402 #endif /* CONFIG_CMDLINE */
 403
 404 #ifdef CONFIG_6xx
 405         ppc_md.power_save = ppc6xx_idle;
 406 #endif
 407
 408         platform_init(r3, r4, r5, r6, r7);
 409
 410         if (ppc_md.progress)
 411                 ppc_md.progress("id mach(): done", 0x200);
 412 }
 413 #ifdef CONFIG_BOOKE_WDT
 414 /* Checks wdt=x and wdt_period=xx command-line option */
 415 int __init early_parse_wdt(char *p)
 416 {
 417         if (p && strncmp(p, "0", 1) != 0)
 418                booke_wdt_enabled = 1;
 419
 420         return 0;
 421 }
 422 early_param("wdt", early_parse_wdt);
 423
 424 int __init early_parse_wdt_period (char *p)
 425 {
 426         if (p)
 427                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 428
 429         return 0;
 430 }
 431 early_param("wdt_period", early_parse_wdt_period);
 432 #endif  /* CONFIG_BOOKE_WDT */
 433
 434 /* Checks "l2cr=xxxx" command-line option */
 435 int __init ppc_setup_l2cr(char *str)
 436 {
 437         if (cpu_has_feature(CPU_FTR_L2CR)) {
 438                 unsigned long val = simple_strtoul(str, NULL, 0);
 439                 printk(KERN_INFO "l2cr set to %lx\n", val);
 440                 _set_L2CR(0);           /* force invalidate by disable cache */
 441                 _set_L2CR(val);         /* and enable it */
 442         }
 443         return 1;
 444 }
 445 __setup("l2cr=", ppc_setup_l2cr);
 446
 447 #ifdef CONFIG_GENERIC_NVRAM
 448
 449 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 450 unsigned char nvram_read_byte(int addr)
 451 {
 452         if (ppc_md.nvram_read_val)
 453                 return ppc_md.nvram_read_val(addr);
 454         return 0xff;
 455 }
 456 EXPORT_SYMBOL(nvram_read_byte);
 457
 458 void nvram_write_byte(unsigned char val, int addr)
 459 {
 460         if (ppc_md.nvram_write_val)
 461                 ppc_md.nvram_write_val(addr, val);
 462 }
 463 EXPORT_SYMBOL(nvram_write_byte);
 464
 465 void nvram_sync(void)
 466 {
 467         if (ppc_md.nvram_sync)
 468                 ppc_md.nvram_sync();
 469 }
 470 EXPORT_SYMBOL(nvram_sync);
 471
 472 #endif /* CONFIG_NVRAM */
 473
 474 static struct cpu cpu_devices[NR_CPUS];
 475
 476 int __init ppc_init(void)
 477 {
 478         int i;
 479
 480         /* clear the progress line */
 481         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 482
 483         /* register CPU devices */
 484         for_each_possible_cpu(i)
 485                 register_cpu(&cpu_devices[i], i);
 486
 487         /* call platform init */
 488         if (ppc_md.init != NULL) {
 489                 ppc_md.init();
 490         }
 491         return 0;
 492 }
 493
 494 arch_initcall(ppc_init);
 495
 496 /* Warning, IO base is not yet inited */
 497 void __init setup_arch(char **cmdline_p)
 498 {
 499         extern char *klimit;
 500         extern void do_init_bootmem(void);
 501
 502         /* so udelay does something sensible, assume <= 1000 bogomips */
 503         loops_per_jiffy = 500000000 / HZ;
 504
 505         if (ppc_md.init_early)
 506                 ppc_md.init_early();
 507
 508 #ifdef CONFIG_XMON
 509         xmon_init(1);
 510         if (strstr(cmd_line, "xmon"))
 511                 xmon(NULL);
 512 #endif /* CONFIG_XMON */
 513         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 514
 515 #if defined(CONFIG_KGDB)
 516         if (ppc_md.kgdb_map_scc)
 517                 ppc_md.kgdb_map_scc();
 518         set_debug_traps();
 519         if (strstr(cmd_line, "gdb")) {
 520                 if (ppc_md.progress)
 521                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 522                 printk("kgdb breakpoint activated\n");
 523                 breakpoint();
 524         }
 525 #endif
 526
 527         /*
 528          * Set cache line size based on type of cpu as a default.
 529          * Systems with OF can look in the properties on the cpu node(s)
 530          * for a possibly more accurate value.
 531          */
 532         if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
 533                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 534                 icache_bsize = cur_cpu_spec->icache_bsize;
 535                 ucache_bsize = 0;
 536         } else
 537                 ucache_bsize = dcache_bsize = icache_bsize
 538                         = cur_cpu_spec->dcache_bsize;
 539
 540         /* reboot on panic */
 541         panic_timeout = 180;
 542
 543         init_mm.start_code = PAGE_OFFSET;
 544         init_mm.end_code = (unsigned long) _etext;
 545         init_mm.end_data = (unsigned long) _edata;
 546         init_mm.brk = (unsigned long) klimit;
 547
 548         /* Save unparsed command line copy for /proc/cmdline */
 549         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 550         *cmdline_p = cmd_line;
 551
 552         parse_early_param();
 553
 554         /* set up the bootmem stuff with available memory */
 555         do_init_bootmem();
 556         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 557
 558 #ifdef CONFIG_PPC_OCP
 559         /* Initialize OCP device list */
 560         ocp_early_init();
 561         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 562 #endif
 563
 564 #ifdef CONFIG_DUMMY_CONSOLE
 565         conswitchp = &dummy_con;
 566 #endif
 567
 568         ppc_md.setup_arch();
 569         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 570
 571         paging_init();
 572 }