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/ide.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/ioport.h>
  24 #include <linux/console.h>
  25 #include <linux/utsname.h>
  26 #include <linux/tty.h>
  27 #include <linux/root_dev.h>
  28 #include <linux/notifier.h>
  29 #include <linux/cpu.h>
  30 #include <linux/unistd.h>
  31 #include <linux/serial.h>
  32 #include <linux/serial_8250.h>
  33 #include <asm/io.h>
  34 #include <asm/prom.h>
  35 #include <asm/processor.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/smp.h>
  38 #include <asm/elf.h>
  39 #include <asm/machdep.h>
  40 #include <asm/time.h>
  41 #include <asm/cputable.h>
  42 #include <asm/sections.h>
  43 #include <asm/btext.h>
  44 #include <asm/nvram.h>
  45 #include <asm/setup.h>
  46 #include <asm/system.h>
  47 #include <asm/rtas.h>
  48 #include <asm/iommu.h>
  49 #include <asm/serial.h>
  50 #include <asm/cache.h>
  51 #include <asm/page.h>
  52 #include <asm/mmu.h>
  53 #include <asm/lmb.h>
  54
  55 #undef DEBUG
  56
  57 #ifdef DEBUG
  58 #define DBG(fmt...) udbg_printf(fmt)
  59 #else
  60 #define DBG(fmt...)
  61 #endif
  62
  63 /*
  64  * This still seems to be needed... -- paulus
  65  */
  66 struct screen_info screen_info = {
  67         .orig_x = 0,
  68         .orig_y = 25,
  69         .orig_video_cols = 80,
  70         .orig_video_lines = 25,
  71         .orig_video_isVGA = 1,
  72         .orig_video_points = 16
  73 };
  74
  75 #ifdef __DO_IRQ_CANON
  76 /* XXX should go elsewhere eventually */
  77 int ppc_do_canonicalize_irqs;
  78 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
  79 #endif
  80
  81 /* also used by kexec */
  82 void machine_shutdown(void)
  83 {
  84         if (ppc_md.nvram_sync)
  85                 ppc_md.nvram_sync();
  86 }
  87
  88 void machine_restart(char *cmd)
  89 {
  90         machine_shutdown();
  91         ppc_md.restart(cmd);
  92 #ifdef CONFIG_SMP
  93         smp_send_stop();
  94 #endif
  95         printk(KERN_EMERG "System Halted, OK to turn off power\n");
  96         local_irq_disable();
  97         while (1) ;
  98 }
  99
 100 void machine_power_off(void)
 101 {
 102         machine_shutdown();
 103         ppc_md.power_off();
 104 #ifdef CONFIG_SMP
 105         smp_send_stop();
 106 #endif
 107         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 108         local_irq_disable();
 109         while (1) ;
 110 }
 111 /* Used by the G5 thermal driver */
 112 EXPORT_SYMBOL_GPL(machine_power_off);
 113
 114 void (*pm_power_off)(void) = machine_power_off;
 115 EXPORT_SYMBOL_GPL(pm_power_off);
 116
 117 void machine_halt(void)
 118 {
 119         machine_shutdown();
 120         ppc_md.halt();
 121 #ifdef CONFIG_SMP
 122         smp_send_stop();
 123 #endif
 124         printk(KERN_EMERG "System Halted, OK to turn off power\n");
 125         local_irq_disable();
 126         while (1) ;
 127 }
 128
 129
 130 #ifdef CONFIG_TAU
 131 extern u32 cpu_temp(unsigned long cpu);
 132 extern u32 cpu_temp_both(unsigned long cpu);
 133 #endif /* CONFIG_TAU */
 134
 135 #ifdef CONFIG_SMP
 136 DEFINE_PER_CPU(unsigned int, pvr);
 137 #endif
 138
 139 static int show_cpuinfo(struct seq_file *m, void *v)
 140 {
 141         unsigned long cpu_id = (unsigned long)v - 1;
 142         unsigned int pvr;
 143         unsigned short maj;
 144         unsigned short min;
 145
 146         if (cpu_id == NR_CPUS) {
 147 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 148                 unsigned long bogosum = 0;
 149                 int i;
 150                 for (i = 0; i < NR_CPUS; ++i)
 151                         if (cpu_online(i))
 152                                 bogosum += loops_per_jiffy;
 153                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 154                            bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 155 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 156                 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 157
 158                 if (ppc_md.show_cpuinfo != NULL)
 159                         ppc_md.show_cpuinfo(m);
 160
 161                 return 0;
 162         }
 163
 164         /* We only show online cpus: disable preempt (overzealous, I
 165          * knew) to prevent cpu going down. */
 166         preempt_disable();
 167         if (!cpu_online(cpu_id)) {
 168                 preempt_enable();
 169                 return 0;
 170         }
 171
 172 #ifdef CONFIG_SMP
 173 #ifdef CONFIG_PPC64     /* XXX for now */
 174         pvr = per_cpu(pvr, cpu_id);
 175 #else
 176         pvr = cpu_data[cpu_id].pvr;
 177 #endif
 178 #else
 179         pvr = mfspr(SPRN_PVR);
 180 #endif
 181         maj = (pvr >> 8) & 0xFF;
 182         min = pvr & 0xFF;
 183
 184         seq_printf(m, "processor\t: %lu\n", cpu_id);
 185         seq_printf(m, "cpu\t\t: ");
 186
 187         if (cur_cpu_spec->pvr_mask)
 188                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 189         else
 190                 seq_printf(m, "unknown (%08x)", pvr);
 191
 192 #ifdef CONFIG_ALTIVEC
 193         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 194                 seq_printf(m, ", altivec supported");
 195 #endif /* CONFIG_ALTIVEC */
 196
 197         seq_printf(m, "\n");
 198
 199 #ifdef CONFIG_TAU
 200         if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 201 #ifdef CONFIG_TAU_AVERAGE
 202                 /* more straightforward, but potentially misleading */
 203                 seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 204                            cpu_temp(i));
 205 #else
 206                 /* show the actual temp sensor range */
 207                 u32 temp;
 208                 temp = cpu_temp_both(i);
 209                 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 210                            temp & 0xff, temp >> 16);
 211 #endif
 212         }
 213 #endif /* CONFIG_TAU */
 214
 215         /*
 216          * Assume here that all clock rates are the same in a
 217          * smp system.  -- Cort
 218          */
 219         if (ppc_proc_freq)
 220                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 221                            ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
 222
 223         if (ppc_md.show_percpuinfo != NULL)
 224                 ppc_md.show_percpuinfo(m, cpu_id);
 225
 226         /* If we are a Freescale core do a simple check so
 227          * we dont have to keep adding cases in the future */
 228         if (PVR_VER(pvr) & 0x8000) {
 229                 maj = PVR_MAJ(pvr);
 230                 min = PVR_MIN(pvr);
 231         } else {
 232                 switch (PVR_VER(pvr)) {
 233                         case 0x0020:    /* 403 family */
 234                                 maj = PVR_MAJ(pvr) + 1;
 235                                 min = PVR_MIN(pvr);
 236                                 break;
 237                         case 0x1008:    /* 740P/750P ?? */
 238                                 maj = ((pvr >> 8) & 0xFF) - 1;
 239                                 min = pvr & 0xFF;
 240                                 break;
 241                         default:
 242                                 maj = (pvr >> 8) & 0xFF;
 243                                 min = pvr & 0xFF;
 244                                 break;
 245                 }
 246         }
 247
 248         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 249                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 250
 251 #ifdef CONFIG_PPC32
 252         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 253                    loops_per_jiffy / (500000/HZ),
 254                    (loops_per_jiffy / (5000/HZ)) % 100);
 255 #endif
 256
 257 #ifdef CONFIG_SMP
 258         seq_printf(m, "\n");
 259 #endif
 260
 261         preempt_enable();
 262         return 0;
 263 }
 264
 265 static void *c_start(struct seq_file *m, loff_t *pos)
 266 {
 267         unsigned long i = *pos;
 268
 269         return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 270 }
 271
 272 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 273 {
 274         ++*pos;
 275         return c_start(m, pos);
 276 }
 277
 278 static void c_stop(struct seq_file *m, void *v)
 279 {
 280 }
 281
 282 struct seq_operations cpuinfo_op = {
 283         .start =c_start,
 284         .next = c_next,
 285         .stop = c_stop,
 286         .show = show_cpuinfo,
 287 };
 288
 289 #ifdef CONFIG_PPC_MULTIPLATFORM
 290 static int __init set_preferred_console(void)
 291 {
 292         struct device_node *prom_stdout = NULL;
 293         char *name;
 294         u32 *spd;
 295         int offset = 0;
 296
 297         DBG(" -> set_preferred_console()\n");
 298
 299         /* The user has requested a console so this is already set up. */
 300         if (strstr(saved_command_line, "console=")) {
 301                 DBG(" console was specified !\n");
 302                 return -EBUSY;
 303         }
 304
 305         if (!of_chosen) {
 306                 DBG(" of_chosen is NULL !\n");
 307                 return -ENODEV;
 308         }
 309         /* We are getting a weird phandle from OF ... */
 310         /* ... So use the full path instead */
 311         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 312         if (name == NULL) {
 313                 DBG(" no linux,stdout-path !\n");
 314                 return -ENODEV;
 315         }
 316         prom_stdout = of_find_node_by_path(name);
 317         if (!prom_stdout) {
 318                 DBG(" can't find stdout package %s !\n", name);
 319                 return -ENODEV;
 320         }
 321         DBG("stdout is %s\n", prom_stdout->full_name);
 322
 323         name = (char *)get_property(prom_stdout, "name", NULL);
 324         if (!name) {
 325                 DBG(" stdout package has no name !\n");
 326                 goto not_found;
 327         }
 328         spd = (u32 *)get_property(prom_stdout, "current-speed", NULL);
 329
 330         if (0)
 331                 ;
 332 #ifdef CONFIG_SERIAL_8250_CONSOLE
 333         else if (strcmp(name, "serial") == 0) {
 334                 int i;
 335                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
 336                 if (i > 8) {
 337                         switch (reg[1]) {
 338                                 case 0x3f8:
 339                                         offset = 0;
 340                                         break;
 341                                 case 0x2f8:
 342                                         offset = 1;
 343                                         break;
 344                                 case 0x898:
 345                                         offset = 2;
 346                                         break;
 347                                 case 0x890:
 348                                         offset = 3;
 349                                         break;
 350                                 default:
 351                                         /* We dont recognise the serial port */
 352                                         goto not_found;
 353                         }
 354                 }
 355         }
 356 #endif /* CONFIG_SERIAL_8250_CONSOLE */
 357 #ifdef CONFIG_PPC_PSERIES
 358         else if (strcmp(name, "vty") == 0) {
 359                 u32 *reg = (u32 *)get_property(prom_stdout, "reg", NULL);
 360                 char *compat = (char *)get_property(prom_stdout, "compatible", NULL);
 361
 362                 if (reg && compat && (strcmp(compat, "hvterm-protocol") == 0)) {
 363                         /* Host Virtual Serial Interface */
 364                         switch (reg[0]) {
 365                                 case 0x30000000:
 366                                         offset = 0;
 367                                         break;
 368                                 case 0x30000001:
 369                                         offset = 1;
 370                                         break;
 371                                 default:
 372                                         goto not_found;
 373                         }
 374                         of_node_put(prom_stdout);
 375                         DBG("Found hvsi console at offset %d\n", offset);
 376                         return add_preferred_console("hvsi", offset, NULL);
 377                 } else {
 378                         /* pSeries LPAR virtual console */
 379                         of_node_put(prom_stdout);
 380                         DBG("Found hvc console\n");
 381                         return add_preferred_console("hvc", 0, NULL);
 382                 }
 383         }
 384 #endif /* CONFIG_PPC_PSERIES */
 385 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 386         else if (strcmp(name, "ch-a") == 0)
 387                 offset = 0;
 388         else if (strcmp(name, "ch-b") == 0)
 389                 offset = 1;
 390 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 391         else
 392                 goto not_found;
 393         of_node_put(prom_stdout);
 394
 395         DBG("Found serial console at ttyS%d\n", offset);
 396
 397         if (spd) {
 398                 static char __initdata opt[16];
 399                 sprintf(opt, "%d", *spd);
 400                 return add_preferred_console("ttyS", offset, opt);
 401         } else
 402                 return add_preferred_console("ttyS", offset, NULL);
 403
 404  not_found:
 405         DBG("No preferred console found !\n");
 406         of_node_put(prom_stdout);
 407         return -ENODEV;
 408 }
 409 console_initcall(set_preferred_console);
 410 #endif /* CONFIG_PPC_MULTIPLATFORM */