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