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 #include <asm/prom.h>
  42
  43 #define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
  44                       defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
  45                       defined(CONFIG_PPC_MPC52xx))
  46
  47 #if USES_PPC_SYS
  48 #include <asm/ppc_sys.h>
  49 #endif
  50
  51 #if defined CONFIG_KGDB
  52 #include <asm/kgdb.h>
  53 #endif
  54
  55 extern void platform_init(unsigned long r3, unsigned long r4,
  56                 unsigned long r5, unsigned long r6, unsigned long r7);
  57 extern void reloc_got2(unsigned long offset);
  58
  59 extern void ppc6xx_idle(void);
  60 extern void power4_idle(void);
  61
  62 extern boot_infos_t *boot_infos;
  63 struct ide_machdep_calls ppc_ide_md;
  64
  65 /* Used with the BI_MEMSIZE bootinfo parameter to store the memory
  66    size value reported by the boot loader. */
  67 unsigned long boot_mem_size;
  68
  69 unsigned long ISA_DMA_THRESHOLD;
  70 unsigned int DMA_MODE_READ;
  71 unsigned int DMA_MODE_WRITE;
  72
  73 #ifdef CONFIG_PPC_PREP
  74 extern void prep_init(unsigned long r3, unsigned long r4,
  75                 unsigned long r5, unsigned long r6, unsigned long r7);
  76
  77 dev_t boot_dev;
  78 #endif /* CONFIG_PPC_PREP */
  79
  80 int have_of;
  81 EXPORT_SYMBOL(have_of);
  82
  83 #ifdef __DO_IRQ_CANON
  84 int ppc_do_canonicalize_irqs;
  85 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  86 #endif
  87
  88 #ifdef CONFIG_VGA_CONSOLE
  89 unsigned long vgacon_remap_base;
  90 #endif
  91
  92 struct machdep_calls ppc_md;
  93
  94 /*
  95  * These are used in binfmt_elf.c to put aux entries on the stack
  96  * for each elf executable being started.
  97  */
  98 int dcache_bsize;
  99 int icache_bsize;
 100 int ucache_bsize;
 101
 102 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
 103     defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
 104 struct screen_info screen_info = {
 105         0, 25,                  /* orig-x, orig-y */
 106         0,                      /* unused */
 107         0,                      /* orig-video-page */
 108         0,                      /* orig-video-mode */
 109         80,                     /* orig-video-cols */
 110         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
 111         25,                     /* orig-video-lines */
 112         1,                      /* orig-video-isVGA */
 113         16                      /* orig-video-points */
 114 };
 115 #endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */
 116
 117 void machine_restart(char *cmd)
 118 {
 119 #ifdef CONFIG_NVRAM
 120         nvram_sync();
 121 #endif
 122         ppc_md.restart(cmd);
 123 }
 124
 125 static void ppc_generic_power_off(void)
 126 {
 127         ppc_md.power_off();
 128 }
 129
 130 void machine_halt(void)
 131 {
 132 #ifdef CONFIG_NVRAM
 133         nvram_sync();
 134 #endif
 135         ppc_md.halt();
 136 }
 137
 138 void (*pm_power_off)(void) = ppc_generic_power_off;
 139
 140 void machine_power_off(void)
 141 {
 142 #ifdef CONFIG_NVRAM
 143         nvram_sync();
 144 #endif
 145         if (pm_power_off)
 146                 pm_power_off();
 147         ppc_generic_power_off();
 148 }
 149
 150 #ifdef CONFIG_TAU
 151 extern u32 cpu_temp(unsigned long cpu);
 152 extern u32 cpu_temp_both(unsigned long cpu);
 153 #endif /* CONFIG_TAU */
 154
 155 int show_cpuinfo(struct seq_file *m, void *v)
 156 {
 157         int i = (int) v - 1;
 158         int err = 0;
 159         unsigned int pvr;
 160         unsigned short maj, min;
 161         unsigned long lpj;
 162
 163         if (i >= NR_CPUS) {
 164                 /* Show summary information */
 165 #ifdef CONFIG_SMP
 166                 unsigned long bogosum = 0;
 167                 for_each_online_cpu(i)
 168                         bogosum += cpu_data[i].loops_per_jiffy;
 169                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 170                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 171 #endif /* CONFIG_SMP */
 172
 173                 if (ppc_md.show_cpuinfo != NULL)
 174                         err = ppc_md.show_cpuinfo(m);
 175                 return err;
 176         }
 177
 178 #ifdef CONFIG_SMP
 179         if (!cpu_online(i))
 180                 return 0;
 181         pvr = cpu_data[i].pvr;
 182         lpj = cpu_data[i].loops_per_jiffy;
 183 #else
 184         pvr = mfspr(SPRN_PVR);
 185         lpj = loops_per_jiffy;
 186 #endif
 187
 188         seq_printf(m, "processor\t: %d\n", i);
 189         seq_printf(m, "cpu\t\t: ");
 190
 191         if (cur_cpu_spec->pvr_mask)
 192                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 193         else
 194                 seq_printf(m, "unknown (%08x)", pvr);
 195 #ifdef CONFIG_ALTIVEC
 196         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 197                 seq_printf(m, ", altivec supported");
 198 #endif
 199         seq_printf(m, "\n");
 200
 201 #ifdef CONFIG_TAU
 202         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 203 #ifdef CONFIG_TAU_AVERAGE
 204                 /* more straightforward, but potentially misleading */
 205                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 206                            cpu_temp(i));
 207 #else
 208                 /* show the actual temp sensor range */
 209                 u32 temp;
 210                 temp = cpu_temp_both(i);
 211                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 212                            temp & 0xff, temp >> 16);
 213 #endif
 214         }
 215 #endif /* CONFIG_TAU */
 216
 217         if (ppc_md.show_percpuinfo != NULL) {
 218                 err = ppc_md.show_percpuinfo(m, i);
 219                 if (err)
 220                         return err;
 221         }
 222
 223         /* If we are a Freescale core do a simple check so
 224          * we dont have to keep adding cases in the future */
 225         if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
 226                 maj = PVR_MAJ(pvr);
 227                 min = PVR_MIN(pvr);
 228         } else {
 229                 switch (PVR_VER(pvr)) {
 230                         case 0x0020:    /* 403 family */
 231                                 maj = PVR_MAJ(pvr) + 1;
 232                                 min = PVR_MIN(pvr);
 233                                 break;
 234                         case 0x1008:    /* 740P/750P ?? */
 235                                 maj = ((pvr >> 8) & 0xFF) - 1;
 236                                 min = pvr & 0xFF;
 237                                 break;
 238                         default:
 239                                 maj = (pvr >> 8) & 0xFF;
 240                                 min = pvr & 0xFF;
 241                                 break;
 242                 }
 243         }
 244
 245         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 246                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 247
 248         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 249                    lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);
 250
 251 #if USES_PPC_SYS
 252         if (cur_ppc_sys_spec->ppc_sys_name)
 253                 seq_printf(m, "chipset\t\t: %s\n",
 254                         cur_ppc_sys_spec->ppc_sys_name);
 255 #endif
 256
 257 #ifdef CONFIG_SMP
 258         seq_printf(m, "\n");
 259 #endif
 260
 261         return 0;
 262 }
 263
 264 static void *c_start(struct seq_file *m, loff_t *pos)
 265 {
 266         int i = *pos;
 267
 268         return i <= NR_CPUS? (void *) (i + 1): NULL;
 269 }
 270
 271 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 272 {
 273         ++*pos;
 274         return c_start(m, pos);
 275 }
 276
 277 static void c_stop(struct seq_file *m, void *v)
 278 {
 279 }
 280
 281 struct seq_operations cpuinfo_op = {
 282         .start =c_start,
 283         .next = c_next,
 284         .stop = c_stop,
 285         .show = show_cpuinfo,
 286 };
 287
 288 /*
 289  * We're called here very early in the boot.  We determine the machine
 290  * type and call the appropriate low-level setup functions.
 291  *  -- Cort <cort@fsmlabs.com>
 292  *
 293  * Note that the kernel may be running at an address which is different
 294  * from the address that it was linked at, so we must use RELOC/PTRRELOC
 295  * to access static data (including strings).  -- paulus
 296  */
 297 __init
 298 unsigned long
 299 early_init(int r3, int r4, int r5)
 300 {
 301         unsigned long phys;
 302         unsigned long offset = reloc_offset();
 303         struct cpu_spec *spec;
 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         spec = identify_cpu(offset);
 317         do_feature_fixups(spec->cpu_features,
 318                           PTRRELOC(&__start___ftr_fixup),
 319                           PTRRELOC(&__stop___ftr_fixup));
 320
 321         return phys;
 322 }
 323
 324 #ifdef CONFIG_PPC_PREP
 325 /*
 326  * The PPC_PREP version of platform_init...
 327  */
 328 void __init
 329 platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 330               unsigned long r6, unsigned long r7)
 331 {
 332 #ifdef CONFIG_BOOTX_TEXT
 333         if (boot_text_mapped) {
 334                 btext_clearscreen();
 335                 btext_welcome();
 336         }
 337 #endif
 338
 339         parse_bootinfo(find_bootinfo());
 340
 341         prep_init(r3, r4, r5, r6, r7);
 342 }
 343 #endif /* CONFIG_PPC_PREP */
 344
 345 struct bi_record *find_bootinfo(void)
 346 {
 347         struct bi_record *rec;
 348
 349         rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
 350         if ( rec->tag != BI_FIRST ) {
 351                 /*
 352                  * This 0x10000 offset is a terrible hack but it will go away when
 353                  * we have the bootloader handle all the relocation and
 354                  * prom calls -- Cort
 355                  */
 356                 rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
 357                 if ( rec->tag != BI_FIRST )
 358                         return NULL;
 359         }
 360         return rec;
 361 }
 362
 363 void parse_bootinfo(struct bi_record *rec)
 364 {
 365         if (rec == NULL || rec->tag != BI_FIRST)
 366                 return;
 367         while (rec->tag != BI_LAST) {
 368                 ulong *data = rec->data;
 369                 switch (rec->tag) {
 370                 case BI_CMD_LINE:
 371                         strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
 372                         break;
 373 #ifdef CONFIG_BLK_DEV_INITRD
 374                 case BI_INITRD:
 375                         initrd_start = data[0] + KERNELBASE;
 376                         initrd_end = data[0] + data[1] + KERNELBASE;
 377                         break;
 378 #endif /* CONFIG_BLK_DEV_INITRD */
 379                 case BI_MEMSIZE:
 380                         boot_mem_size = data[0];
 381                         break;
 382                 }
 383                 rec = (struct bi_record *)((ulong)rec + rec->size);
 384         }
 385 }
 386
 387 /*
 388  * Find out what kind of machine we're on and save any data we need
 389  * from the early boot process (devtree is copied on pmac by prom_init()).
 390  * This is called very early on the boot process, after a minimal
 391  * MMU environment has been set up but before MMU_init is called.
 392  */
 393 void __init
 394 machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
 395              unsigned long r6, unsigned long r7)
 396 {
 397 #ifdef CONFIG_CMDLINE
 398         strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
 399 #endif /* CONFIG_CMDLINE */
 400
 401 #ifdef CONFIG_6xx
 402         ppc_md.power_save = ppc6xx_idle;
 403 #endif
 404
 405         platform_init(r3, r4, r5, r6, r7);
 406
 407         if (ppc_md.progress)
 408                 ppc_md.progress("id mach(): done", 0x200);
 409 }
 410 #ifdef CONFIG_BOOKE_WDT
 411 /* Checks wdt=x and wdt_period=xx command-line option */
 412 int __init early_parse_wdt(char *p)
 413 {
 414         if (p && strncmp(p, "0", 1) != 0)
 415                booke_wdt_enabled = 1;
 416
 417         return 0;
 418 }
 419 early_param("wdt", early_parse_wdt);
 420
 421 int __init early_parse_wdt_period (char *p)
 422 {
 423         if (p)
 424                 booke_wdt_period = simple_strtoul(p, NULL, 0);
 425
 426         return 0;
 427 }
 428 early_param("wdt_period", early_parse_wdt_period);
 429 #endif  /* CONFIG_BOOKE_WDT */
 430
 431 /* Checks "l2cr=xxxx" command-line option */
 432 int __init ppc_setup_l2cr(char *str)
 433 {
 434         if (cpu_has_feature(CPU_FTR_L2CR)) {
 435                 unsigned long val = simple_strtoul(str, NULL, 0);
 436                 printk(KERN_INFO "l2cr set to %lx\n", val);
 437                 _set_L2CR(0);           /* force invalidate by disable cache */
 438                 _set_L2CR(val);         /* and enable it */
 439         }
 440         return 1;
 441 }
 442 __setup("l2cr=", ppc_setup_l2cr);
 443
 444 #ifdef CONFIG_GENERIC_NVRAM
 445
 446 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 447 unsigned char nvram_read_byte(int addr)
 448 {
 449         if (ppc_md.nvram_read_val)
 450                 return ppc_md.nvram_read_val(addr);
 451         return 0xff;
 452 }
 453 EXPORT_SYMBOL(nvram_read_byte);
 454
 455 void nvram_write_byte(unsigned char val, int addr)
 456 {
 457         if (ppc_md.nvram_write_val)
 458                 ppc_md.nvram_write_val(addr, val);
 459 }
 460 EXPORT_SYMBOL(nvram_write_byte);
 461
 462 void nvram_sync(void)
 463 {
 464         if (ppc_md.nvram_sync)
 465                 ppc_md.nvram_sync();
 466 }
 467 EXPORT_SYMBOL(nvram_sync);
 468
 469 #endif /* CONFIG_NVRAM */
 470
 471 static struct cpu cpu_devices[NR_CPUS];
 472
 473 int __init ppc_init(void)
 474 {
 475         int i;
 476
 477         /* clear the progress line */
 478         if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);
 479
 480         /* register CPU devices */
 481         for_each_possible_cpu(i)
 482                 register_cpu(&cpu_devices[i], i);
 483
 484         /* call platform init */
 485         if (ppc_md.init != NULL) {
 486                 ppc_md.init();
 487         }
 488         return 0;
 489 }
 490
 491 arch_initcall(ppc_init);
 492
 493 /* Warning, IO base is not yet inited */
 494 void __init setup_arch(char **cmdline_p)
 495 {
 496         extern char *klimit;
 497         extern void do_init_bootmem(void);
 498
 499         /* so udelay does something sensible, assume <= 1000 bogomips */
 500         loops_per_jiffy = 500000000 / HZ;
 501
 502         if (ppc_md.init_early)
 503                 ppc_md.init_early();
 504
 505 #ifdef CONFIG_XMON
 506         xmon_init(1);
 507         if (strstr(cmd_line, "xmon"))
 508                 xmon(NULL);
 509 #endif /* CONFIG_XMON */
 510         if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);
 511
 512 #if defined(CONFIG_KGDB)
 513         if (ppc_md.kgdb_map_scc)
 514                 ppc_md.kgdb_map_scc();
 515         set_debug_traps();
 516         if (strstr(cmd_line, "gdb")) {
 517                 if (ppc_md.progress)
 518                         ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
 519                 printk("kgdb breakpoint activated\n");
 520                 breakpoint();
 521         }
 522 #endif
 523
 524         /*
 525          * Set cache line size based on type of cpu as a default.
 526          * Systems with OF can look in the properties on the cpu node(s)
 527          * for a possibly more accurate value.
 528          */
 529         if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
 530                 dcache_bsize = cur_cpu_spec->dcache_bsize;
 531                 icache_bsize = cur_cpu_spec->icache_bsize;
 532                 ucache_bsize = 0;
 533         } else
 534                 ucache_bsize = dcache_bsize = icache_bsize
 535                         = cur_cpu_spec->dcache_bsize;
 536
 537         /* reboot on panic */
 538         panic_timeout = 180;
 539
 540         init_mm.start_code = PAGE_OFFSET;
 541         init_mm.end_code = (unsigned long) _etext;
 542         init_mm.end_data = (unsigned long) _edata;
 543         init_mm.brk = (unsigned long) klimit;
 544
 545         /* Save unparsed command line copy for /proc/cmdline */
 546         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 547         *cmdline_p = cmd_line;
 548
 549         parse_early_param();
 550
 551         /* set up the bootmem stuff with available memory */
 552         do_init_bootmem();
 553         if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
 554
 555 #ifdef CONFIG_PPC_OCP
 556         /* Initialize OCP device list */
 557         ocp_early_init();
 558         if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
 559 #endif
 560
 561 #ifdef CONFIG_DUMMY_CONSOLE
 562         conswitchp = &dummy_con;
 563 #endif
 564
 565         ppc_md.setup_arch();
 566         if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);
 567
 568         paging_init();
 569 }