arch/powerpc/kernel/setup-common.c

   1 /*
   2  * Common boot and setup code for both 32-bit and 64-bit.
   3  * Extracted from arch/powerpc/kernel/setup_64.c.
   4  *
   5  * Copyright (C) 2001 PPC64 Team, IBM Corp
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/string.h>
  15 #include <linux/sched.h>
  16 #include <linux/init.h>
  17 #include <linux/kernel.h>
  18 #include <linux/reboot.h>
  19 #include <linux/delay.h>
  20 #include <linux/initrd.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/ide.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/ioport.h>
  25 #include <linux/console.h>
  26 #include <linux/utsname.h>
  27 #include <linux/tty.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/notifier.h>
  30 #include <linux/cpu.h>
  31 #include <linux/unistd.h>
  32 #include <linux/serial.h>
  33 #include <linux/serial_8250.h>
  34 #include <asm/io.h>
  35 #include <asm/prom.h>
  36 #include <asm/processor.h>
  37 #include <asm/vdso_datapage.h>
  38 #include <asm/pgtable.h>
  39 #include <asm/smp.h>
  40 #include <asm/elf.h>
  41 #include <asm/machdep.h>
  42 #include <asm/time.h>
  43 #include <asm/cputable.h>
  44 #include <asm/sections.h>
  45 #include <asm/btext.h>
  46 #include <asm/nvram.h>
  47 #include <asm/setup.h>
  48 #include <asm/system.h>
  49 #include <asm/rtas.h>
  50 #include <asm/iommu.h>
  51 #include <asm/serial.h>
  52 #include <asm/cache.h>
  53 #include <asm/page.h>
  54 #include <asm/mmu.h>
  55 #include <asm/lmb.h>
  56 #include <asm/xmon.h>
  57
  58 #include "setup.h"
  59
  60 #undef DEBUG
  61
  62 #ifdef DEBUG
  63 #include <asm/udbg.h>
  64 #define DBG(fmt...) udbg_printf(fmt)
  65 #else
  66 #define DBG(fmt...)
  67 #endif
  68
  69 #ifdef CONFIG_PPC_MULTIPLATFORM
  70 int _machine = 0;
  71 EXPORT_SYMBOL(_machine);
  72 #endif
  73
  74 unsigned long klimit = (unsigned long) _end;
  75
  76 /*
  77  * This still seems to be needed... -- paulus
  78  */
  79 struct screen_info screen_info = {
  80         .orig_x = 0,
  81         .orig_y = 25,
  82         .orig_video_cols = 80,
  83         .orig_video_lines = 25,
  84         .orig_video_isVGA = 1,
  85         .orig_video_points = 16
  86 };
  87
  88 #ifdef __DO_IRQ_CANON
  89 /* XXX should go elsewhere eventually */
  90 int ppc_do_canonicalize_irqs;
  91 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  92 #endif
  93
  94 /* also used by kexec */
  95 void machine_shutdown(void)
  96 {
  97         if (ppc_md.machine_shutdown)
  98                 ppc_md.machine_shutdown();
  99 }
 100
 101 void machine_restart(char *cmd)
 102 {
 103         machine_shutdown();
 104         if (ppc_md.restart)
 105                 ppc_md.restart(cmd);
 106 #ifdef CONFIG_SMP
 107         smp_send_stop();
 108 #endif
 109         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 110         local_irq_disable();
 111         while (1) ;
 112 }
 113
 114 void machine_power_off(void)
 115 {
 116         machine_shutdown();
 117         if (ppc_md.power_off)
 118                 ppc_md.power_off();
 119 #ifdef CONFIG_SMP
 120         smp_send_stop();
 121 #endif
 122         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 123         local_irq_disable();
 124         while (1) ;
 125 }
 126 /* Used by the G5 thermal driver */
 127 EXPORT_SYMBOL_GPL(machine_power_off);
 128
 129 void (*pm_power_off)(void) = machine_power_off;
 130 EXPORT_SYMBOL_GPL(pm_power_off);
 131
 132 void machine_halt(void)
 133 {
 134         machine_shutdown();
 135         if (ppc_md.halt)
 136                 ppc_md.halt();
 137 #ifdef CONFIG_SMP
 138         smp_send_stop();
 139 #endif
 140         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 141         local_irq_disable();
 142         while (1) ;
 143 }
 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 #ifdef CONFIG_SMP
 152 DEFINE_PER_CPU(unsigned int, pvr);
 153 #endif
 154
 155 static int show_cpuinfo(struct seq_file *m, void *v)
 156 {
 157         unsigned long cpu_id = (unsigned long)v - 1;
 158         unsigned int pvr;
 159         unsigned short maj;
 160         unsigned short min;
 161
 162         if (cpu_id == NR_CPUS) {
 163 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 164                 unsigned long bogosum = 0;
 165                 int i;
 166                 for (i = 0; i < NR_CPUS; ++i)
 167                         if (cpu_online(i))
 168                                 bogosum += 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 && CONFIG_PPC32 */
 172                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 173
 174                 if (ppc_md.show_cpuinfo != NULL)
 175                         ppc_md.show_cpuinfo(m);
 176
 177                 return 0;
 178         }
 179
 180         /* We only show online cpus: disable preempt (overzealous, I
 181          * knew) to prevent cpu going down. */
 182         preempt_disable();
 183         if (!cpu_online(cpu_id)) {
 184                 preempt_enable();
 185                 return 0;
 186         }
 187
 188 #ifdef CONFIG_SMP
 189         pvr = per_cpu(pvr, cpu_id);
 190 #else
 191         pvr = mfspr(SPRN_PVR);
 192 #endif
 193         maj = (pvr >> 8) & 0xFF;
 194         min = pvr & 0xFF;
 195
 196         seq_printf(m, "processor\t: %lu\n", cpu_id);
 197         seq_printf(m, "cpu\t\t: ");
 198
 199         if (cur_cpu_spec->pvr_mask)
 200                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 201         else
 202                 seq_printf(m, "unknown (%08x)", pvr);
 203
 204 #ifdef CONFIG_ALTIVEC
 205         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 206                 seq_printf(m, ", altivec supported");
 207 #endif /* CONFIG_ALTIVEC */
 208
 209         seq_printf(m, "\n");
 210
 211 #ifdef CONFIG_TAU
 212         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 213 #ifdef CONFIG_TAU_AVERAGE
 214                 /* more straightforward, but potentially misleading */
 215                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 216                            cpu_temp(cpu_id));
 217 #else
 218                 /* show the actual temp sensor range */
 219                 u32 temp;
 220                 temp = cpu_temp_both(cpu_id);
 221                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 222                            temp & 0xff, temp >> 16);
 223 #endif
 224         }
 225 #endif /* CONFIG_TAU */
 226
 227         /*
 228          * Assume here that all clock rates are the same in a
 229          * smp system.  -- Cort
 230          */
 231         if (ppc_proc_freq)
 232                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 233                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 234
 235         if (ppc_md.show_percpuinfo != NULL)
 236                 ppc_md.show_percpuinfo(m, cpu_id);
 237
 238         /* If we are a Freescale core do a simple check so
 239          * we dont have to keep adding cases in the future */
 240         if (PVR_VER(pvr) & 0x8000) {
 241                 maj = PVR_MAJ(pvr);
 242                 min = PVR_MIN(pvr);
 243         } else {
 244                 switch (PVR_VER(pvr)) {
 245                         case 0x0020:    /* 403 family */
 246                                 maj = PVR_MAJ(pvr) + 1;
 247                                 min = PVR_MIN(pvr);
 248                                 break;
 249                         case 0x1008:    /* 740P/750P ?? */
 250                                 maj = ((pvr >> 8) & 0xFF) - 1;
 251                                 min = pvr & 0xFF;
 252                                 break;
 253                         default:
 254                                 maj = (pvr >> 8) & 0xFF;
 255                                 min = pvr & 0xFF;
 256                                 break;
 257                 }
 258         }
 259
 260         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 261                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 262
 263 #ifdef CONFIG_PPC32
 264         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 265                    loops_per_jiffy / (500000/HZ),
 266                    (loops_per_jiffy / (5000/HZ)) % 100);
 267 #endif
 268
 269 #ifdef CONFIG_SMP
 270         seq_printf(m, "\n");
 271 #endif
 272
 273         preempt_enable();
 274         return 0;
 275 }
 276
 277 static void *c_start(struct seq_file *m, loff_t *pos)
 278 {
 279         unsigned long i = *pos;
 280
 281         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 282 }
 283
 284 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 285 {
 286         ++*pos;
 287         return c_start(m, pos);
 288 }
 289
 290 static void c_stop(struct seq_file *m, void *v)
 291 {
 292 }
 293
 294 struct seq_operations cpuinfo_op = {
 295         .start =c_start,
 296         .next = c_next,
 297         .stop = c_stop,
 298         .show = show_cpuinfo,
 299 };
 300
 301 void __init check_for_initrd(void)
 302 {
 303 #ifdef CONFIG_BLK_DEV_INITRD
 304         unsigned long *prop;
 305
 306         DBG(" -> check_for_initrd()\n");
 307
 308         if (of_chosen) {
 309                 prop = (unsigned long *)get_property(of_chosen,
 310                                 "linux,initrd-start", NULL);
 311                 if (prop != NULL) {
 312                         initrd_start = (unsigned long)__va(*prop);
 313                         prop = (unsigned long *)get_property(of_chosen,
 314                                         "linux,initrd-end", NULL);
 315                         if (prop != NULL) {
 316                                 initrd_end = (unsigned long)__va(*prop);
 317                                 initrd_below_start_ok = 1;
 318                         } else
 319                                 initrd_start = 0;
 320                 }
 321         }
 322
 323         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 324          * look sensible. If not, clear initrd reference.
 325          */
 326         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 327             initrd_end > initrd_start)
 328                 ROOT_DEV = Root_RAM0;
 329         else
 330                 initrd_start = initrd_end = 0;
 331
 332         if (initrd_start)
 333                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 334
 335         DBG(" <- check_for_initrd()\n");
 336 #endif /* CONFIG_BLK_DEV_INITRD */
 337 }
 338
 339 #ifdef CONFIG_SMP
 340
 341 /**
 342  * setup_cpu_maps - initialize the following cpu maps:
 343  *                  cpu_possible_map
 344  *                  cpu_present_map
 345  *                  cpu_sibling_map
 346  *
 347  * Having the possible map set up early allows us to restrict allocations
 348  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 349  *
 350  * We do not initialize the online map here; cpus set their own bits in
 351  * cpu_online_map as they come up.
 352  *
 353  * This function is valid only for Open Firmware systems.  finish_device_tree
 354  * must be called before using this.
 355  *
 356  * While we're here, we may as well set the "physical" cpu ids in the paca.
 357  */
 358 void __init smp_setup_cpu_maps(void)
 359 {
 360         struct device_node *dn = NULL;
 361         int cpu = 0;
 362         int swap_cpuid = 0;
 363
 364         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 365                 int *intserv;
 366                 int j, len = sizeof(u32), nthreads = 1;
 367
 368                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 369                                               &len);
 370                 if (intserv)
 371                         nthreads = len / sizeof(int);
 372                 else {
 373                         intserv = (int *) get_property(dn, "reg", NULL);
 374                         if (!intserv)
 375                                 intserv = &cpu; /* assume logical == phys */
 376                 }
 377
 378                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 379                         cpu_set(cpu, cpu_present_map);
 380                         set_hard_smp_processor_id(cpu, intserv[j]);
 381
 382                         if (intserv[j] == boot_cpuid_phys)
 383                                 swap_cpuid = cpu;
 384                         cpu_set(cpu, cpu_possible_map);
 385                         cpu++;
 386                 }
 387         }
 388
 389         /* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
 390          * boot cpu is logical 0.
 391          */
 392         if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
 393                 u32 tmp;
 394                 tmp = get_hard_smp_processor_id(0);
 395                 set_hard_smp_processor_id(0, boot_cpuid_phys);
 396                 set_hard_smp_processor_id(swap_cpuid, tmp);
 397         }
 398
 399 #ifdef CONFIG_PPC64
 400         /*
 401          * On pSeries LPAR, we need to know how many cpus
 402          * could possibly be added to this partition.
 403          */
 404         if (_machine == PLATFORM_PSERIES_LPAR &&
 405             (dn = of_find_node_by_path("/rtas"))) {
 406                 int num_addr_cell, num_size_cell, maxcpus;
 407                 unsigned int *ireg;
 408
 409                 num_addr_cell = prom_n_addr_cells(dn);
 410                 num_size_cell = prom_n_size_cells(dn);
 411
 412                 ireg = (unsigned int *)
 413                         get_property(dn, "ibm,lrdr-capacity", NULL);
 414
 415                 if (!ireg)
 416                         goto out;
 417
 418                 maxcpus = ireg[num_addr_cell + num_size_cell];
 419
 420                 /* Double maxcpus for processors which have SMT capability */
 421                 if (cpu_has_feature(CPU_FTR_SMT))
 422                         maxcpus *= 2;
 423
 424                 if (maxcpus > NR_CPUS) {
 425                         printk(KERN_WARNING
 426                                "Partition configured for %d cpus, "
 427                                "operating system maximum is %d.\n",
 428                                maxcpus, NR_CPUS);
 429                         maxcpus = NR_CPUS;
 430                 } else
 431                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 432                                maxcpus);
 433
 434                 for (cpu = 0; cpu < maxcpus; cpu++)
 435                         cpu_set(cpu, cpu_possible_map);
 436         out:
 437                 of_node_put(dn);
 438         }
 439
 440         /*
 441          * Do the sibling map; assume only two threads per processor.
 442          */
 443         for_each_cpu(cpu) {
 444                 cpu_set(cpu, cpu_sibling_map[cpu]);
 445                 if (cpu_has_feature(CPU_FTR_SMT))
 446                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 447         }
 448
 449         vdso_data->processorCount = num_present_cpus();
 450 #endif /* CONFIG_PPC64 */
 451 }
 452 #endif /* CONFIG_SMP */
 453
 454 #ifdef CONFIG_XMON
 455 static int __init early_xmon(char *p)
 456 {
 457         /* ensure xmon is enabled */
 458         if (p) {
 459                 if (strncmp(p, "on", 2) == 0)
 460                         xmon_init(1);
 461                 if (strncmp(p, "off", 3) == 0)
 462                         xmon_init(0);
 463                 if (strncmp(p, "early", 5) != 0)
 464                         return 0;
 465         }
 466         xmon_init(1);
 467         debugger(NULL);
 468
 469         return 0;
 470 }
 471 early_param("xmon", early_xmon);
 472 #endif
 473
 474 static __init int add_pcspkr(void)
 475 {
 476         struct device_node *np;
 477         struct platform_device *pd;
 478         int ret;
 479
 480         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 481         of_node_put(np);
 482         if (!np)
 483                 return -ENODEV;
 484
 485         pd = platform_device_alloc("pcspkr", -1);
 486         if (!pd)
 487                 return -ENOMEM;
 488
 489         ret = platform_device_add(pd);
 490         if (ret)
 491                 platform_device_put(pd);
 492
 493         return ret;
 494 }
 495 device_initcall(add_pcspkr);