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/platform_device.h>
  25 #include <linux/ide.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/ioport.h>
  28 #include <linux/console.h>
  29 #include <linux/utsname.h>
  30 #include <linux/tty.h>
  31 #include <linux/root_dev.h>
  32 #include <linux/notifier.h>
  33 #include <linux/cpu.h>
  34 #include <linux/unistd.h>
  35 #include <linux/serial.h>
  36 #include <linux/serial_8250.h>
  37 #include <asm/io.h>
  38 #include <asm/prom.h>
  39 #include <asm/processor.h>
  40 #include <asm/vdso_datapage.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/smp.h>
  43 #include <asm/elf.h>
  44 #include <asm/machdep.h>
  45 #include <asm/time.h>
  46 #include <asm/cputable.h>
  47 #include <asm/sections.h>
  48 #include <asm/firmware.h>
  49 #include <asm/btext.h>
  50 #include <asm/nvram.h>
  51 #include <asm/setup.h>
  52 #include <asm/system.h>
  53 #include <asm/rtas.h>
  54 #include <asm/iommu.h>
  55 #include <asm/serial.h>
  56 #include <asm/cache.h>
  57 #include <asm/page.h>
  58 #include <asm/mmu.h>
  59 #include <asm/lmb.h>
  60 #include <asm/xmon.h>
  61
  62 #include "setup.h"
  63
  64 #ifdef DEBUG
  65 #include <asm/udbg.h>
  66 #define DBG(fmt...) udbg_printf(fmt)
  67 #else
  68 #define DBG(fmt...)
  69 #endif
  70
  71 /* The main machine-dep calls structure
  72  */
  73 struct machdep_calls ppc_md;
  74 EXPORT_SYMBOL(ppc_md);
  75 struct machdep_calls *machine_id;
  76 EXPORT_SYMBOL(machine_id);
  77
  78 unsigned long klimit = (unsigned long) _end;
  79
  80 /*
  81  * This still seems to be needed... -- paulus
  82  */
  83 struct screen_info screen_info = {
  84         .orig_x = 0,
  85         .orig_y = 25,
  86         .orig_video_cols = 80,
  87         .orig_video_lines = 25,
  88         .orig_video_isVGA = 1,
  89         .orig_video_points = 16
  90 };
  91
  92 #ifdef __DO_IRQ_CANON
  93 /* XXX should go elsewhere eventually */
  94 int ppc_do_canonicalize_irqs;
  95 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  96 #endif
  97
  98 /* also used by kexec */
  99 void machine_shutdown(void)
 100 {
 101         if (ppc_md.machine_shutdown)
 102                 ppc_md.machine_shutdown();
 103 }
 104
 105 void machine_restart(char *cmd)
 106 {
 107         machine_shutdown();
 108         if (ppc_md.restart)
 109                 ppc_md.restart(cmd);
 110 #ifdef CONFIG_SMP
 111         smp_send_stop();
 112 #endif
 113         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 114         local_irq_disable();
 115         while (1) ;
 116 }
 117
 118 void machine_power_off(void)
 119 {
 120         machine_shutdown();
 121         if (ppc_md.power_off)
 122                 ppc_md.power_off();
 123 #ifdef CONFIG_SMP
 124         smp_send_stop();
 125 #endif
 126         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 127         local_irq_disable();
 128         while (1) ;
 129 }
 130 /* Used by the G5 thermal driver */
 131 EXPORT_SYMBOL_GPL(machine_power_off);
 132
 133 void (*pm_power_off)(void) = machine_power_off;
 134 EXPORT_SYMBOL_GPL(pm_power_off);
 135
 136 void machine_halt(void)
 137 {
 138         machine_shutdown();
 139         if (ppc_md.halt)
 140                 ppc_md.halt();
 141 #ifdef CONFIG_SMP
 142         smp_send_stop();
 143 #endif
 144         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 145         local_irq_disable();
 146         while (1) ;
 147 }
 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 #ifdef CONFIG_SMP
 156 DEFINE_PER_CPU(unsigned int, pvr);
 157 #endif
 158
 159 static int show_cpuinfo(struct seq_file *m, void *v)
 160 {
 161         unsigned long cpu_id = (unsigned long)v - 1;
 162         unsigned int pvr;
 163         unsigned short maj;
 164         unsigned short min;
 165
 166         if (cpu_id == NR_CPUS) {
 167 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 168                 unsigned long bogosum = 0;
 169                 int i;
 170                 for_each_online_cpu(i)
 171                         bogosum += loops_per_jiffy;
 172                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 173                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 174 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 175                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 176                 if (ppc_md.name)
 177                         seq_printf(m, "platform\t: %s\n", ppc_md.name);
 178                 if (ppc_md.show_cpuinfo != NULL)
 179                         ppc_md.show_cpuinfo(m);
 180
 181                 return 0;
 182         }
 183
 184         /* We only show online cpus: disable preempt (overzealous, I
 185          * knew) to prevent cpu going down. */
 186         preempt_disable();
 187         if (!cpu_online(cpu_id)) {
 188                 preempt_enable();
 189                 return 0;
 190         }
 191
 192 #ifdef CONFIG_SMP
 193         pvr = per_cpu(pvr, cpu_id);
 194 #else
 195         pvr = mfspr(SPRN_PVR);
 196 #endif
 197         maj = (pvr >> 8) & 0xFF;
 198         min = pvr & 0xFF;
 199
 200         seq_printf(m, "processor\t: %lu\n", cpu_id);
 201         seq_printf(m, "cpu\t\t: ");
 202
 203         if (cur_cpu_spec->pvr_mask)
 204                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 205         else
 206                 seq_printf(m, "unknown (%08x)", pvr);
 207
 208 #ifdef CONFIG_ALTIVEC
 209         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 210                 seq_printf(m, ", altivec supported");
 211 #endif /* CONFIG_ALTIVEC */
 212
 213         seq_printf(m, "\n");
 214
 215 #ifdef CONFIG_TAU
 216         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 217 #ifdef CONFIG_TAU_AVERAGE
 218                 /* more straightforward, but potentially misleading */
 219                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 220                            cpu_temp(cpu_id));
 221 #else
 222                 /* show the actual temp sensor range */
 223                 u32 temp;
 224                 temp = cpu_temp_both(cpu_id);
 225                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 226                            temp & 0xff, temp >> 16);
 227 #endif
 228         }
 229 #endif /* CONFIG_TAU */
 230
 231         /*
 232          * Assume here that all clock rates are the same in a
 233          * smp system.  -- Cort
 234          */
 235         if (ppc_proc_freq)
 236                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 237                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 238
 239         if (ppc_md.show_percpuinfo != NULL)
 240                 ppc_md.show_percpuinfo(m, cpu_id);
 241
 242         /* If we are a Freescale core do a simple check so
 243          * we dont have to keep adding cases in the future */
 244         if (PVR_VER(pvr) & 0x8000) {
 245                 maj = PVR_MAJ(pvr);
 246                 min = PVR_MIN(pvr);
 247         } else {
 248                 switch (PVR_VER(pvr)) {
 249                         case 0x0020:    /* 403 family */
 250                                 maj = PVR_MAJ(pvr) + 1;
 251                                 min = PVR_MIN(pvr);
 252                                 break;
 253                         case 0x1008:    /* 740P/750P ?? */
 254                                 maj = ((pvr >> 8) & 0xFF) - 1;
 255                                 min = pvr & 0xFF;
 256                                 break;
 257                         default:
 258                                 maj = (pvr >> 8) & 0xFF;
 259                                 min = pvr & 0xFF;
 260                                 break;
 261                 }
 262         }
 263
 264         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 265                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 266
 267 #ifdef CONFIG_PPC32
 268         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 269                    loops_per_jiffy / (500000/HZ),
 270                    (loops_per_jiffy / (5000/HZ)) % 100);
 271 #endif
 272
 273 #ifdef CONFIG_SMP
 274         seq_printf(m, "\n");
 275 #endif
 276
 277         preempt_enable();
 278         return 0;
 279 }
 280
 281 static void *c_start(struct seq_file *m, loff_t *pos)
 282 {
 283         unsigned long i = *pos;
 284
 285         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 286 }
 287
 288 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 289 {
 290         ++*pos;
 291         return c_start(m, pos);
 292 }
 293
 294 static void c_stop(struct seq_file *m, void *v)
 295 {
 296 }
 297
 298 struct seq_operations cpuinfo_op = {
 299         .start =c_start,
 300         .next = c_next,
 301         .stop = c_stop,
 302         .show = show_cpuinfo,
 303 };
 304
 305 void __init check_for_initrd(void)
 306 {
 307 #ifdef CONFIG_BLK_DEV_INITRD
 308         unsigned long *prop;
 309
 310         DBG(" -> check_for_initrd()\n");
 311
 312         if (of_chosen) {
 313                 prop = (unsigned long *)get_property(of_chosen,
 314                                 "linux,initrd-start", NULL);
 315                 if (prop != NULL) {
 316                         initrd_start = (unsigned long)__va(*prop);
 317                         prop = (unsigned long *)get_property(of_chosen,
 318                                         "linux,initrd-end", NULL);
 319                         if (prop != NULL) {
 320                                 initrd_end = (unsigned long)__va(*prop);
 321                                 initrd_below_start_ok = 1;
 322                         } else
 323                                 initrd_start = 0;
 324                 }
 325         }
 326
 327         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 328          * look sensible. If not, clear initrd reference.
 329          */
 330         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 331             initrd_end > initrd_start)
 332                 ROOT_DEV = Root_RAM0;
 333         else
 334                 initrd_start = initrd_end = 0;
 335
 336         if (initrd_start)
 337                 printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 338
 339         DBG(" <- check_for_initrd()\n");
 340 #endif /* CONFIG_BLK_DEV_INITRD */
 341 }
 342
 343 #ifdef CONFIG_SMP
 344
 345 /**
 346  * setup_cpu_maps - initialize the following cpu maps:
 347  *                  cpu_possible_map
 348  *                  cpu_present_map
 349  *                  cpu_sibling_map
 350  *
 351  * Having the possible map set up early allows us to restrict allocations
 352  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
 353  *
 354  * We do not initialize the online map here; cpus set their own bits in
 355  * cpu_online_map as they come up.
 356  *
 357  * This function is valid only for Open Firmware systems.  finish_device_tree
 358  * must be called before using this.
 359  *
 360  * While we're here, we may as well set the "physical" cpu ids in the paca.
 361  *
 362  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 363  */
 364 void __init smp_setup_cpu_maps(void)
 365 {
 366         struct device_node *dn = NULL;
 367         int cpu = 0;
 368
 369         while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 370                 int *intserv;
 371                 int j, len = sizeof(u32), nthreads = 1;
 372
 373                 intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
 374                                               &len);
 375                 if (intserv)
 376                         nthreads = len / sizeof(int);
 377                 else {
 378                         intserv = (int *) get_property(dn, "reg", NULL);
 379                         if (!intserv)
 380                                 intserv = &cpu; /* assume logical == phys */
 381                 }
 382
 383                 for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 384                         cpu_set(cpu, cpu_present_map);
 385                         set_hard_smp_processor_id(cpu, intserv[j]);
 386                         cpu_set(cpu, cpu_possible_map);
 387                         cpu++;
 388                 }
 389         }
 390
 391 #ifdef CONFIG_PPC64
 392         /*
 393          * On pSeries LPAR, we need to know how many cpus
 394          * could possibly be added to this partition.
 395          */
 396         if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 397             (dn = of_find_node_by_path("/rtas"))) {
 398                 int num_addr_cell, num_size_cell, maxcpus;
 399                 unsigned int *ireg;
 400
 401                 num_addr_cell = prom_n_addr_cells(dn);
 402                 num_size_cell = prom_n_size_cells(dn);
 403
 404                 ireg = (unsigned int *)
 405                         get_property(dn, "ibm,lrdr-capacity", NULL);
 406
 407                 if (!ireg)
 408                         goto out;
 409
 410                 maxcpus = ireg[num_addr_cell + num_size_cell];
 411
 412                 /* Double maxcpus for processors which have SMT capability */
 413                 if (cpu_has_feature(CPU_FTR_SMT))
 414                         maxcpus *= 2;
 415
 416                 if (maxcpus > NR_CPUS) {
 417                         printk(KERN_WARNING
 418                                "Partition configured for %d cpus, "
 419                                "operating system maximum is %d.\n",
 420                                maxcpus, NR_CPUS);
 421                         maxcpus = NR_CPUS;
 422                 } else
 423                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 424                                maxcpus);
 425
 426                 for (cpu = 0; cpu < maxcpus; cpu++)
 427                         cpu_set(cpu, cpu_possible_map);
 428         out:
 429                 of_node_put(dn);
 430         }
 431
 432         /*
 433          * Do the sibling map; assume only two threads per processor.
 434          */
 435         for_each_possible_cpu(cpu) {
 436                 cpu_set(cpu, cpu_sibling_map[cpu]);
 437                 if (cpu_has_feature(CPU_FTR_SMT))
 438                         cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
 439         }
 440
 441         vdso_data->processorCount = num_present_cpus();
 442 #endif /* CONFIG_PPC64 */
 443 }
 444 #endif /* CONFIG_SMP */
 445
 446 #ifdef CONFIG_XMON
 447 static int __init early_xmon(char *p)
 448 {
 449         /* ensure xmon is enabled */
 450         if (p) {
 451                 if (strncmp(p, "on", 2) == 0)
 452                         xmon_init(1);
 453                 if (strncmp(p, "off", 3) == 0)
 454                         xmon_init(0);
 455                 if (strncmp(p, "early", 5) != 0)
 456                         return 0;
 457         }
 458         xmon_init(1);
 459         debugger(NULL);
 460
 461         return 0;
 462 }
 463 early_param("xmon", early_xmon);
 464 #endif
 465
 466 static __init int add_pcspkr(void)
 467 {
 468         struct device_node *np;
 469         struct platform_device *pd;
 470         int ret;
 471
 472         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 473         of_node_put(np);
 474         if (!np)
 475                 return -ENODEV;
 476
 477         pd = platform_device_alloc("pcspkr", -1);
 478         if (!pd)
 479                 return -ENOMEM;
 480
 481         ret = platform_device_add(pd);
 482         if (ret)
 483                 platform_device_put(pd);
 484
 485         return ret;
 486 }
 487 device_initcall(add_pcspkr);
 488
 489 void probe_machine(void)
 490 {
 491         extern struct machdep_calls __machine_desc_start;
 492         extern struct machdep_calls __machine_desc_end;
 493
 494         /*
 495          * Iterate all ppc_md structures until we find the proper
 496          * one for the current machine type
 497          */
 498         DBG("Probing machine type ...\n");
 499
 500         for (machine_id = &__machine_desc_start;
 501              machine_id < &__machine_desc_end;
 502              machine_id++) {
 503                 DBG("  %s ...", machine_id->name);
 504                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 505                 if (ppc_md.probe()) {
 506                         DBG(" match !\n");
 507                         break;
 508                 }
 509                 DBG("\n");
 510         }
 511         /* What can we do if we didn't find ? */
 512         if (machine_id >= &__machine_desc_end) {
 513                 DBG("No suitable machine found !\n");
 514                 for (;;);
 515         }
 516
 517         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 518 }