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
  13 #undef DEBUG
  14
  15 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/string.h>
  18 #include <linux/sched.h>
  19 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/reboot.h>
  22 #include <linux/delay.h>
  23 #include <linux/initrd.h>
  24 #include <linux/ide.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/ioport.h>
  27 #include <linux/console.h>
  28 #include <linux/utsname.h>
  29 #include <linux/tty.h>
  30 #include <linux/root_dev.h>
  31 #include <linux/notifier.h>
  32 #include <linux/cpu.h>
  33 #include <linux/unistd.h>
  34 #include <linux/serial.h>
  35 #include <linux/serial_8250.h>
  36 #include <asm/io.h>
  37 #include <asm/prom.h>
  38 #include <asm/processor.h>
  39 #include <asm/vdso_datapage.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/smp.h>
  42 #include <asm/elf.h>
  43 #include <asm/machdep.h>
  44 #include <asm/time.h>
  45 #include <asm/cputable.h>
  46 #include <asm/sections.h>
  47 #include <asm/firmware.h>
  48 #include <asm/btext.h>
  49 #include <asm/nvram.h>
  50 #include <asm/setup.h>
  51 #include <asm/system.h>
  52 #include <asm/rtas.h>
  53 #include <asm/iommu.h>
  54 #include <asm/serial.h>
  55 #include <asm/cache.h>
  56 #include <asm/page.h>
  57 #include <asm/mmu.h>
  58 #include <asm/lmb.h>
  59 #include <asm/xmon.h>
  60
  61 #include "setup.h"
  62
  63 #ifdef DEBUG
  64 #include <asm/udbg.h>
  65 #define DBG(fmt...) udbg_printf(fmt)
  66 #else
  67 #define DBG(fmt...)
  68 #endif
  69
  70 /* The main machine-dep calls structure
  71  */
  72 struct machdep_calls ppc_md;
  73 EXPORT_SYMBOL(ppc_md);
  74 struct machdep_calls *machine_id;
  75 EXPORT_SYMBOL(machine_id);
  76
  77 unsigned long klimit = (unsigned long) _end;
  78
  79 /*
  80  * This still seems to be needed... -- paulus
  81  */
  82 struct screen_info screen_info = {
  83         .orig_x = 0,
  84         .orig_y = 25,
  85         .orig_video_cols = 80,
  86         .orig_video_lines = 25,
  87         .orig_video_isVGA = 1,
  88         .orig_video_points = 16
  89 };
  90
  91 #ifdef __DO_IRQ_CANON
  92 /* XXX should go elsewhere eventually */
  93 int ppc_do_canonicalize_irqs;
  94 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  95 #endif
  96
  97 /* also used by kexec */
  98 void machine_shutdown(void)
  99 {
 100         if (ppc_md.machine_shutdown)
 101                 ppc_md.machine_shutdown();
 102 }
 103
 104 void machine_restart(char *cmd)
 105 {
 106         machine_shutdown();
 107         if (ppc_md.restart)
 108                 ppc_md.restart(cmd);
 109 #ifdef CONFIG_SMP
 110         smp_send_stop();
 111 #endif
 112         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 113         local_irq_disable();
 114         while (1) ;
 115 }
 116
 117 void machine_power_off(void)
 118 {
 119         machine_shutdown();
 120         if (ppc_md.power_off)
 121                 ppc_md.power_off();
 122 #ifdef CONFIG_SMP
 123         smp_send_stop();
 124 #endif
 125         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 126         local_irq_disable();
 127         while (1) ;
 128 }
 129 /* Used by the G5 thermal driver */
 130 EXPORT_SYMBOL_GPL(machine_power_off);
 131
 132 void (*pm_power_off)(void) = machine_power_off;
 133 EXPORT_SYMBOL_GPL(pm_power_off);
 134
 135 void machine_halt(void)
 136 {
 137         machine_shutdown();
 138         if (ppc_md.halt)
 139                 ppc_md.halt();
 140 #ifdef CONFIG_SMP
 141         smp_send_stop();
 142 #endif
 143         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 144         local_irq_disable();
 145         while (1) ;
 146 }
 147
 148
 149 #ifdef CONFIG_TAU
 150 extern u32 cpu_temp(unsigned long cpu);
 151 extern u32 cpu_temp_both(unsigned long cpu);
 152 #endif /* CONFIG_TAU */
 153
 154 #ifdef CONFIG_SMP
 155 DEFINE_PER_CPU(unsigned int, pvr);
 156 #endif
 157
 158 static int show_cpuinfo(struct seq_file *m, void *v)
 159 {
 160         unsigned long cpu_id = (unsigned long)v - 1;
 161         unsigned int pvr;
 162         unsigned short maj;
 163         unsigned short min;
 164
 165         if (cpu_id == NR_CPUS) {
 166 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 167                 unsigned long bogosum = 0;
 168                 int i;
 169                 for_each_online_cpu(i)
 170                         bogosum += loops_per_jiffy;
 171                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 172                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 173 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 174                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 175                 if (ppc_md.name)
 176                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 177                 if (ppc_md.show_cpuinfo != NULL)
 178                         ppc_md.show_cpuinfo(m);
 179
 180                 return 0;
 181         }
 182
 183         /* We only show online cpus: disable preempt (overzealous, I
 184          * knew) to prevent cpu going down. */
 185         preempt_disable();
 186         if (!cpu_online(cpu_id)) {
 187                 preempt_enable();
 188                 return 0;
 189         }
 190
 191 #ifdef CONFIG_SMP
 192         pvr = per_cpu(pvr, cpu_id);
 193 #else
 194         pvr = mfspr(SPRN_PVR);
 195 #endif
 196         maj = (pvr >> 8) & 0xFF;
 197         min = pvr & 0xFF;
 198
 199         seq_printf(m, "processor\t: %lu\n", cpu_id);
 200         seq_printf(m, "cpu\t\t: ");
 201
 202         if (cur_cpu_spec->pvr_mask)
 203                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 204         else
 205                 seq_printf(m, "unknown (%08x)", pvr);
 206
 207 #ifdef CONFIG_ALTIVEC
 208         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 209                 seq_printf(m, ", altivec supported");
 210 #endif /* CONFIG_ALTIVEC */
 211
 212         seq_printf(m, "\n");
 213
 214 #ifdef CONFIG_TAU
 215         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 216 #ifdef CONFIG_TAU_AVERAGE
 217                 /* more straightforward, but potentially misleading */
 218                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 219                            cpu_temp(cpu_id));
 220 #else
 221                 /* show the actual temp sensor range */
 222                 u32 temp;
 223                 temp = cpu_temp_both(cpu_id);
 224                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 225                            temp & 0xff, temp >> 16);
 226 #endif
 227         }
 228 #endif /* CONFIG_TAU */
 229
 230         /*
 231          * Assume here that all clock rates are the same in a
 232          * smp system.  -- Cort
 233          */
 234         if (ppc_proc_freq)
 235                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 236                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 237
 238         if (ppc_md.show_percpuinfo != NULL)
 239                 ppc_md.show_percpuinfo(m, cpu_id);
 240
 241         /* If we are a Freescale core do a simple check so
 242          * we dont have to keep adding cases in the future */
 243         if (PVR_VER(pvr) & 0x8000) {
 244                 maj = PVR_MAJ(pvr);
 245                 min = PVR_MIN(pvr);
 246         } else {
 247                 switch (PVR_VER(pvr)) {
 248                         case 0x0020:    /* 403 family */
 249                                 maj = PVR_MAJ(pvr) + 1;
 250                                 min = PVR_MIN(pvr);
 251                                 break;
 252                         case 0x1008:    /* 740P/750P ?? */
 253                                 maj = ((pvr >> 8) & 0xFF) - 1;
 254                                 min = pvr & 0xFF;
 255                                 break;
 256                         default:
 257                                 maj = (pvr >> 8) & 0xFF;
 258                                 min = pvr & 0xFF;
 259                                 break;
 260                 }
 261         }
 262
 263         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 264                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 265
 266 #ifdef CONFIG_PPC32
 267         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 268                    loops_per_jiffy / (500000/HZ),
 269                    (loops_per_jiffy / (5000/HZ)) % 100);
 270 #endif
 271
 272 #ifdef CONFIG_SMP
 273         seq_printf(m, "\n");
 274 #endif
 275
 276         preempt_enable();
 277         return 0;
 278 }
 279
 280 static void *c_start(struct seq_file *m, loff_t *pos)
 281 {
 282         unsigned long i = *pos;
 283
 284         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 285 }
 286
 287 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 288 {
 289         ++*pos;
 290         return c_start(m, pos);
 291 }
 292
 293 static void c_stop(struct seq_file *m, void *v)
 294 {
 295 }
 296
 297 struct seq_operations cpuinfo_op = {
 298         .start =c_start,
 299         .next = c_next,
 300         .stop = c_stop,
 301         .show = show_cpuinfo,
 302 };
 303
 304 void __init check_for_initrd(void)
 305 {
 306 #ifdef CONFIG_BLK_DEV_INITRD
 307         unsigned long *prop;
 308
 309         DBG(" -> check_for_initrd()\n");
 310
 311         if (of_chosen) {
 312                 prop = (unsigned long *)get_property(of_chosen,
 313                                 "linux,initrd-start", NULL);
 314                 if (prop != NULL) {
 315                         initrd_start = (unsigned long)__va(*prop);
 316                         prop = (unsigned long *)get_property(of_chosen,
 317                                         "linux,initrd-end", NULL);
 318                         if (prop != NULL) {
 319                                 initrd_end = (unsigned long)__va(*prop);
 320                                 initrd_below_start_ok = 1;
 321                         } else
 322                                 initrd_start = 0;
 323                 }
 324         }
 325
 326         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 327          * look sensible. If not, clear initrd reference.
 328          */
 329         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 330             initrd_end > initrd_start)
 331                 ROOT_DEV = Root_RAM0;
 332         else
 333                 initrd_start = initrd_end = 0;
 334
 335         if (initrd_start)
 336                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 337
 338         DBG(" <- check_for_initrd()\n");
 339 #endif /* CONFIG_BLK_DEV_INITRD */
 340 }
 341
 342 #ifdef CONFIG_SMP
 343
 344 /**
 345  * setup_cpu_maps - initialize the following cpu maps:
 346  *                  cpu_possible_map
 347  *                  cpu_present_map
 348  *                  cpu_sibling_map
 349  *
 350  * Having the possible map set up early allows us to restrict allocations
 351  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 352  *
 353  * We do not initialize the online map here; cpus set their own bits in
 354  * cpu_online_map as they come up.
 355  *
 356  * This function is valid only for Open Firmware systems.  finish_device_tree
 357  * must be called before using this.
 358  *
 359  * While we're here, we may as well set the "physical" cpu ids in the paca.
 360  *
 361  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 362  */
 363 void __init smp_setup_cpu_maps(void)
 364 {
 365         struct device_node *dn = NULL;
 366         int cpu = 0;
 367
 368         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 369                 int *intserv;
 370                 int j, len = sizeof(u32), nthreads = 1;
 371
 372                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 373                                               &len);
 374                 if (intserv)
 375                         nthreads = len / sizeof(int);
 376                 else {
 377                         intserv = (int *) get_property(dn, "reg", NULL);
 378                         if (!intserv)
 379                                 intserv = &cpu; /* assume logical == phys */
 380                 }
 381
 382                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 383                         cpu_set(cpu, cpu_present_map);
 384                         set_hard_smp_processor_id(cpu, intserv[j]);
 385                         cpu_set(cpu, cpu_possible_map);
 386                         cpu++;
 387                 }
 388         }
 389
 390 #ifdef CONFIG_PPC64
 391         /*
 392          * On pSeries LPAR, we need to know how many cpus
 393          * could possibly be added to this partition.
 394          */
 395         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 396             (dn = of_find_node_by_path("/rtas"))) {
 397                 int num_addr_cell, num_size_cell, maxcpus;
 398                 unsigned int *ireg;
 399
 400                 num_addr_cell = prom_n_addr_cells(dn);
 401                 num_size_cell = prom_n_size_cells(dn);
 402
 403                 ireg = (unsigned int *)
 404                         get_property(dn, "ibm,lrdr-capacity", NULL);
 405
 406                 if (!ireg)
 407                         goto out;
 408
 409                 maxcpus = ireg[num_addr_cell + num_size_cell];
 410
 411                 /* Double maxcpus for processors which have SMT capability */
 412                 if (cpu_has_feature(CPU_FTR_SMT))
 413                         maxcpus *= 2;
 414
 415                 if (maxcpus > NR_CPUS) {
 416                         printk(KERN_WARNING
 417                                "Partition configured for %d cpus, "
 418                                "operating system maximum is %d.\n",
 419                                maxcpus, NR_CPUS);
 420                         maxcpus = NR_CPUS;
 421                 } else
 422                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 423                                maxcpus);
 424
 425                 for (cpu = 0; cpu < maxcpus; cpu++)
 426                         cpu_set(cpu, cpu_possible_map);
 427         out:
 428                 of_node_put(dn);
 429         }
 430
 431         /*
 432          * Do the sibling map; assume only two threads per processor.
 433          */
 434         for_each_possible_cpu(cpu) {
 435                 cpu_set(cpu, cpu_sibling_map[cpu]);
 436                 if (cpu_has_feature(CPU_FTR_SMT))
 437                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 438         }
 439
 440         vdso_data->processorCount = num_present_cpus();
 441 #endif /* CONFIG_PPC64 */
 442 }
 443 #endif /* CONFIG_SMP */
 444
 445 #ifdef CONFIG_XMON
 446 static int __init early_xmon(char *p)
 447 {
 448         /* ensure xmon is enabled */
 449         if (p) {
 450                 if (strncmp(p, "on", 2) == 0)
 451                         xmon_init(1);
 452                 if (strncmp(p, "off", 3) == 0)
 453                         xmon_init(0);
 454                 if (strncmp(p, "early", 5) != 0)
 455                         return 0;
 456         }
 457         xmon_init(1);
 458         debugger(NULL);
 459
 460         return 0;
 461 }
 462 early_param("xmon", early_xmon);
 463 #endif
 464
 465 void probe_machine(void)
 466 {
 467         extern struct machdep_calls __machine_desc_start;
 468         extern struct machdep_calls __machine_desc_end;
 469
 470         /*
 471          * Iterate all ppc_md structures until we find the proper
 472          * one for the current machine type
 473          */
 474         DBG("Probing machine type ...\n");
 475
 476         for (machine_id = &__machine_desc_start;
 477              machine_id < &__machine_desc_end;
 478              machine_id++) {
 479                 DBG("  %s ...", machine_id->name);
 480                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 481                 if (ppc_md.probe()) {
 482                         DBG(" match !\n");
 483                         break;
 484                 }
 485                 DBG("\n");
 486         }
 487         /* What can we do if we didn't find ? */
 488         if (machine_id >= &__machine_desc_end) {
 489                 DBG("No suitable machine found !\n");
 490                 for (;;);
 491         }
 492
 493         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 494 }