arch/powerpc/platforms/powermac/setup.c

   1 /*
   2  *  Powermac setup and early boot code plus other random bits.
   3  *
   4  *  PowerPC version
   5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   6  *
   7  *  Adapted for Power Macintosh by Paul Mackerras
   8  *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
   9  *
  10  *  Derived from "arch/alpha/kernel/setup.c"
  11  *    Copyright (C) 1995 Linus Torvalds
  12  *
  13  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
  14  *
  15  *  This program is free software; you can redistribute it and/or
  16  *  modify it under the terms of the GNU General Public License
  17  *  as published by the Free Software Foundation; either version
  18  *  2 of the License, or (at your option) any later version.
  19  *
  20  */
  21
  22 /*
  23  * bootup setup stuff..
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/errno.h>
  28 #include <linux/sched.h>
  29 #include <linux/kernel.h>
  30 #include <linux/mm.h>
  31 #include <linux/stddef.h>
  32 #include <linux/unistd.h>
  33 #include <linux/ptrace.h>
  34 #include <linux/export.h>
  35 #include <linux/user.h>
  36 #include <linux/tty.h>
  37 #include <linux/string.h>
  38 #include <linux/delay.h>
  39 #include <linux/ioport.h>
  40 #include <linux/major.h>
  41 #include <linux/initrd.h>
  42 #include <linux/vt_kern.h>
  43 #include <linux/console.h>
  44 #include <linux/pci.h>
  45 #include <linux/adb.h>
  46 #include <linux/cuda.h>
  47 #include <linux/pmu.h>
  48 #include <linux/irq.h>
  49 #include <linux/seq_file.h>
  50 #include <linux/root_dev.h>
  51 #include <linux/bitops.h>
  52 #include <linux/suspend.h>
  53 #include <linux/of_device.h>
  54 #include <linux/of_platform.h>
  55
  56 #include <asm/reg.h>
  57 #include <asm/sections.h>
  58 #include <asm/prom.h>
  59 #include <asm/pgtable.h>
  60 #include <asm/io.h>
  61 #include <asm/pci-bridge.h>
  62 #include <asm/ohare.h>
  63 #include <asm/mediabay.h>
  64 #include <asm/machdep.h>
  65 #include <asm/dma.h>
  66 #include <asm/cputable.h>
  67 #include <asm/btext.h>
  68 #include <asm/pmac_feature.h>
  69 #include <asm/time.h>
  70 #include <asm/mmu_context.h>
  71 #include <asm/iommu.h>
  72 #include <asm/smu.h>
  73 #include <asm/pmc.h>
  74 #include <asm/udbg.h>
  75
  76 #include "pmac.h"
  77
  78 #undef SHOW_GATWICK_IRQS
  79
  80 int ppc_override_l2cr = 0;
  81 int ppc_override_l2cr_value;
  82 int has_l2cache = 0;
  83
  84 int pmac_newworld;
  85
  86 static int current_root_goodness = -1;
  87
  88 extern struct machdep_calls pmac_md;
  89
  90 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  91
  92 #ifdef CONFIG_PPC64
  93 int sccdbg;
  94 #endif
  95
  96 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  97 EXPORT_SYMBOL(sys_ctrler);
  98
  99 static void pmac_show_cpuinfo(struct seq_file *m)
 100 {
 101         struct device_node *np;
 102         const char *pp;
 103         int plen;
 104         int mbmodel;
 105         unsigned int mbflags;
 106         char* mbname;
 107
 108         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 109                                     PMAC_MB_INFO_MODEL, 0);
 110         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 111                                     PMAC_MB_INFO_FLAGS, 0);
 112         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 113                               (long) &mbname) != 0)
 114                 mbname = "Unknown";
 115
 116         /* find motherboard type */
 117         seq_printf(m, "machine\t\t: ");
 118         np = of_find_node_by_path("/");
 119         if (np != NULL) {
 120                 pp = of_get_property(np, "model", NULL);
 121                 if (pp != NULL)
 122                         seq_printf(m, "%s\n", pp);
 123                 else
 124                         seq_printf(m, "PowerMac\n");
 125                 pp = of_get_property(np, "compatible", &plen);
 126                 if (pp != NULL) {
 127                         seq_printf(m, "motherboard\t:");
 128                         while (plen > 0) {
 129                                 int l = strlen(pp) + 1;
 130                                 seq_printf(m, " %s", pp);
 131                                 plen -= l;
 132                                 pp += l;
 133                         }
 134                         seq_printf(m, "\n");
 135                 }
 136                 of_node_put(np);
 137         } else
 138                 seq_printf(m, "PowerMac\n");
 139
 140         /* print parsed model */
 141         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 142         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 143
 144         /* find l2 cache info */
 145         np = of_find_node_by_name(NULL, "l2-cache");
 146         if (np == NULL)
 147                 np = of_find_node_by_type(NULL, "cache");
 148         if (np != NULL) {
 149                 const unsigned int *ic =
 150                         of_get_property(np, "i-cache-size", NULL);
 151                 const unsigned int *dc =
 152                         of_get_property(np, "d-cache-size", NULL);
 153                 seq_printf(m, "L2 cache\t:");
 154                 has_l2cache = 1;
 155                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
 156                         seq_printf(m, " %dK unified", *dc / 1024);
 157                 } else {
 158                         if (ic)
 159                                 seq_printf(m, " %dK instruction", *ic / 1024);
 160                         if (dc)
 161                                 seq_printf(m, "%s %dK data",
 162                                            (ic? " +": ""), *dc / 1024);
 163                 }
 164                 pp = of_get_property(np, "ram-type", NULL);
 165                 if (pp)
 166                         seq_printf(m, " %s", pp);
 167                 seq_printf(m, "\n");
 168                 of_node_put(np);
 169         }
 170
 171         /* Indicate newworld/oldworld */
 172         seq_printf(m, "pmac-generation\t: %s\n",
 173                    pmac_newworld ? "NewWorld" : "OldWorld");
 174 }
 175
 176 #ifndef CONFIG_ADB_CUDA
 177 int find_via_cuda(void)
 178 {
 179         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 180
 181         if (!dn)
 182                 return 0;
 183         of_node_put(dn);
 184         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 185         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 186         return 0;
 187 }
 188 #endif
 189
 190 #ifndef CONFIG_ADB_PMU
 191 int find_via_pmu(void)
 192 {
 193         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 194
 195         if (!dn)
 196                 return 0;
 197         of_node_put(dn);
 198         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 199         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 200         return 0;
 201 }
 202 #endif
 203
 204 #ifndef CONFIG_PMAC_SMU
 205 int smu_init(void)
 206 {
 207         /* should check and warn if SMU is present */
 208         return 0;
 209 }
 210 #endif
 211
 212 #ifdef CONFIG_PPC32
 213 static volatile u32 *sysctrl_regs;
 214
 215 static void __init ohare_init(void)
 216 {
 217         struct device_node *dn;
 218
 219         /* this area has the CPU identification register
 220            and some registers used by smp boards */
 221         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 222
 223         /*
 224          * Turn on the L2 cache.
 225          * We assume that we have a PSX memory controller iff
 226          * we have an ohare I/O controller.
 227          */
 228         dn = of_find_node_by_name(NULL, "ohare");
 229         if (dn) {
 230                 of_node_put(dn);
 231                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 232                         if (sysctrl_regs[4] & 0x10)
 233                                 sysctrl_regs[4] |= 0x04000020;
 234                         else
 235                                 sysctrl_regs[4] |= 0x04000000;
 236                         if(has_l2cache)
 237                                 printk(KERN_INFO "Level 2 cache enabled\n");
 238                 }
 239         }
 240 }
 241
 242 static void __init l2cr_init(void)
 243 {
 244         /* Checks "l2cr-value" property in the registry */
 245         if (cpu_has_feature(CPU_FTR_L2CR)) {
 246                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
 247                 if (np == 0)
 248                         np = of_find_node_by_type(NULL, "cpu");
 249                 if (np != 0) {
 250                         const unsigned int *l2cr =
 251                                 of_get_property(np, "l2cr-value", NULL);
 252                         if (l2cr != 0) {
 253                                 ppc_override_l2cr = 1;
 254                                 ppc_override_l2cr_value = *l2cr;
 255                                 _set_L2CR(0);
 256                                 _set_L2CR(ppc_override_l2cr_value);
 257                         }
 258                         of_node_put(np);
 259                 }
 260         }
 261
 262         if (ppc_override_l2cr)
 263                 printk(KERN_INFO "L2CR overridden (0x%x), "
 264                        "backside cache is %s\n",
 265                        ppc_override_l2cr_value,
 266                        (ppc_override_l2cr_value & 0x80000000)
 267                                 ? "enabled" : "disabled");
 268 }
 269 #endif
 270
 271 static void __init pmac_setup_arch(void)
 272 {
 273         struct device_node *cpu, *ic;
 274         const int *fp;
 275         unsigned long pvr;
 276
 277         pvr = PVR_VER(mfspr(SPRN_PVR));
 278
 279         /* Set loops_per_jiffy to a half-way reasonable value,
 280            for use until calibrate_delay gets called. */
 281         loops_per_jiffy = 50000000 / HZ;
 282         cpu = of_find_node_by_type(NULL, "cpu");
 283         if (cpu != NULL) {
 284                 fp = of_get_property(cpu, "clock-frequency", NULL);
 285                 if (fp != NULL) {
 286                         if (pvr >= 0x30 && pvr < 0x80)
 287                                 /* PPC970 etc. */
 288                                 loops_per_jiffy = *fp / (3 * HZ);
 289                         else if (pvr == 4 || pvr >= 8)
 290                                 /* 604, G3, G4 etc. */
 291                                 loops_per_jiffy = *fp / HZ;
 292                         else
 293                                 /* 601, 603, etc. */
 294                                 loops_per_jiffy = *fp / (2 * HZ);
 295                 }
 296                 of_node_put(cpu);
 297         }
 298
 299         /* See if newworld or oldworld */
 300         ic = of_find_node_with_property(NULL, "interrupt-controller");
 301         if (ic) {
 302                 pmac_newworld = 1;
 303                 of_node_put(ic);
 304         }
 305
 306         /* Lookup PCI hosts */
 307         pmac_pci_init();
 308
 309 #ifdef CONFIG_PPC32
 310         ohare_init();
 311         l2cr_init();
 312 #endif /* CONFIG_PPC32 */
 313
 314         find_via_cuda();
 315         find_via_pmu();
 316         smu_init();
 317
 318 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
 319     defined(CONFIG_PPC64)
 320         pmac_nvram_init();
 321 #endif
 322 #ifdef CONFIG_PPC32
 323 #ifdef CONFIG_BLK_DEV_INITRD
 324         if (initrd_start)
 325                 ROOT_DEV = Root_RAM0;
 326         else
 327 #endif
 328                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 329 #endif
 330
 331 #ifdef CONFIG_ADB
 332         if (strstr(boot_command_line, "adb_sync")) {
 333                 extern int __adb_probe_sync;
 334                 __adb_probe_sync = 1;
 335         }
 336 #endif /* CONFIG_ADB */
 337 }
 338
 339 #ifdef CONFIG_SCSI
 340 void note_scsi_host(struct device_node *node, void *host)
 341 {
 342 }
 343 EXPORT_SYMBOL(note_scsi_host);
 344 #endif
 345
 346 static int initializing = 1;
 347
 348 static int pmac_late_init(void)
 349 {
 350         initializing = 0;
 351         return 0;
 352 }
 353 machine_late_initcall(powermac, pmac_late_init);
 354
 355 void note_bootable_part(dev_t dev, int part, int goodness);
 356 /*
 357  * This is __ref because we check for "initializing" before
 358  * touching any of the __init sensitive things and "initializing"
 359  * will be false after __init time. This can't be __init because it
 360  * can be called whenever a disk is first accessed.
 361  */
 362 void __ref note_bootable_part(dev_t dev, int part, int goodness)
 363 {
 364         char *p;
 365
 366         if (!initializing)
 367                 return;
 368         if ((goodness <= current_root_goodness) &&
 369             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 370                 return;
 371         p = strstr(boot_command_line, "root=");
 372         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 373                 return;
 374
 375         ROOT_DEV = dev + part;
 376         current_root_goodness = goodness;
 377 }
 378
 379 #ifdef CONFIG_ADB_CUDA
 380 static void __noreturn cuda_restart(void)
 381 {
 382         struct adb_request req;
 383
 384         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 385         for (;;)
 386                 cuda_poll();
 387 }
 388
 389 static void __noreturn cuda_shutdown(void)
 390 {
 391         struct adb_request req;
 392
 393         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 394         for (;;)
 395                 cuda_poll();
 396 }
 397
 398 #else
 399 #define cuda_restart()
 400 #define cuda_shutdown()
 401 #endif
 402
 403 #ifndef CONFIG_ADB_PMU
 404 #define pmu_restart()
 405 #define pmu_shutdown()
 406 #endif
 407
 408 #ifndef CONFIG_PMAC_SMU
 409 #define smu_restart()
 410 #define smu_shutdown()
 411 #endif
 412
 413 static void __noreturn pmac_restart(char *cmd)
 414 {
 415         switch (sys_ctrler) {
 416         case SYS_CTRLER_CUDA:
 417                 cuda_restart();
 418                 break;
 419         case SYS_CTRLER_PMU:
 420                 pmu_restart();
 421                 break;
 422         case SYS_CTRLER_SMU:
 423                 smu_restart();
 424                 break;
 425         default: ;
 426         }
 427         while (1) ;
 428 }
 429
 430 static void __noreturn pmac_power_off(void)
 431 {
 432         switch (sys_ctrler) {
 433         case SYS_CTRLER_CUDA:
 434                 cuda_shutdown();
 435                 break;
 436         case SYS_CTRLER_PMU:
 437                 pmu_shutdown();
 438                 break;
 439         case SYS_CTRLER_SMU:
 440                 smu_shutdown();
 441                 break;
 442         default: ;
 443         }
 444         while (1) ;
 445 }
 446
 447 static void __noreturn
 448 pmac_halt(void)
 449 {
 450         pmac_power_off();
 451 }
 452
 453 /*
 454  * Early initialization.
 455  */
 456 static void __init pmac_init(void)
 457 {
 458         /* Enable early btext debug if requested */
 459         if (strstr(boot_command_line, "btextdbg")) {
 460                 udbg_adb_init_early();
 461                 register_early_udbg_console();
 462         }
 463
 464         /* Probe motherboard chipset */
 465         pmac_feature_init();
 466
 467         /* Initialize debug stuff */
 468         udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 469         udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 470
 471 #ifdef CONFIG_PPC64
 472         iommu_init_early_dart(&pmac_pci_controller_ops);
 473 #endif
 474
 475         /* SMP Init has to be done early as we need to patch up
 476          * cpu_possible_mask before interrupt stacks are allocated
 477          * or kaboom...
 478          */
 479 #ifdef CONFIG_SMP
 480         pmac_setup_smp();
 481 #endif
 482 }
 483
 484 static int __init pmac_declare_of_platform_devices(void)
 485 {
 486         struct device_node *np;
 487
 488         np = of_find_node_by_name(NULL, "valkyrie");
 489         if (np) {
 490                 of_platform_device_create(np, "valkyrie", NULL);
 491                 of_node_put(np);
 492         }
 493         np = of_find_node_by_name(NULL, "platinum");
 494         if (np) {
 495                 of_platform_device_create(np, "platinum", NULL);
 496                 of_node_put(np);
 497         }
 498         np = of_find_node_by_type(NULL, "smu");
 499         if (np) {
 500                 of_platform_device_create(np, "smu", NULL);
 501                 of_node_put(np);
 502         }
 503         np = of_find_node_by_type(NULL, "fcu");
 504         if (np == NULL) {
 505                 /* Some machines have strangely broken device-tree */
 506                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 507         }
 508         if (np) {
 509                 of_platform_device_create(np, "temperature", NULL);
 510                 of_node_put(np);
 511         }
 512
 513         return 0;
 514 }
 515 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 516
 517 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 518 /*
 519  * This is called very early, as part of console_init() (typically just after
 520  * time_init()). This function is respondible for trying to find a good
 521  * default console on serial ports. It tries to match the open firmware
 522  * default output with one of the available serial console drivers.
 523  */
 524 static int __init check_pmac_serial_console(void)
 525 {
 526         struct device_node *prom_stdout = NULL;
 527         int offset = 0;
 528         const char *name;
 529 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 530         char *devname = "ttyS";
 531 #else
 532         char *devname = "ttyPZ";
 533 #endif
 534
 535         pr_debug(" -> check_pmac_serial_console()\n");
 536
 537         /* The user has requested a console so this is already set up. */
 538         if (strstr(boot_command_line, "console=")) {
 539                 pr_debug(" console was specified !\n");
 540                 return -EBUSY;
 541         }
 542
 543         if (!of_chosen) {
 544                 pr_debug(" of_chosen is NULL !\n");
 545                 return -ENODEV;
 546         }
 547
 548         /* We are getting a weird phandle from OF ... */
 549         /* ... So use the full path instead */
 550         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 551         if (name == NULL) {
 552                 pr_debug(" no linux,stdout-path !\n");
 553                 return -ENODEV;
 554         }
 555         prom_stdout = of_find_node_by_path(name);
 556         if (!prom_stdout) {
 557                 pr_debug(" can't find stdout package %s !\n", name);
 558                 return -ENODEV;
 559         }
 560         pr_debug("stdout is %pOF\n", prom_stdout);
 561
 562         name = of_get_property(prom_stdout, "name", NULL);
 563         if (!name) {
 564                 pr_debug(" stdout package has no name !\n");
 565                 goto not_found;
 566         }
 567
 568         if (strcmp(name, "ch-a") == 0)
 569                 offset = 0;
 570         else if (strcmp(name, "ch-b") == 0)
 571                 offset = 1;
 572         else
 573                 goto not_found;
 574         of_node_put(prom_stdout);
 575
 576         pr_debug("Found serial console at %s%d\n", devname, offset);
 577
 578         return add_preferred_console(devname, offset, NULL);
 579
 580  not_found:
 581         pr_debug("No preferred console found !\n");
 582         of_node_put(prom_stdout);
 583         return -ENODEV;
 584 }
 585 console_initcall(check_pmac_serial_console);
 586
 587 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 588
 589 /*
 590  * Called very early, MMU is off, device-tree isn't unflattened
 591  */
 592 static int __init pmac_probe(void)
 593 {
 594         if (!of_machine_is_compatible("Power Macintosh") &&
 595             !of_machine_is_compatible("MacRISC"))
 596                 return 0;
 597
 598 #ifdef CONFIG_PPC32
 599         /* isa_io_base gets set in pmac_pci_init */
 600         ISA_DMA_THRESHOLD = ~0L;
 601         DMA_MODE_READ = 1;
 602         DMA_MODE_WRITE = 2;
 603 #endif /* CONFIG_PPC32 */
 604
 605         pm_power_off = pmac_power_off;
 606
 607         pmac_init();
 608
 609         return 1;
 610 }
 611
 612 define_machine(powermac) {
 613         .name                   = "PowerMac",
 614         .probe                  = pmac_probe,
 615         .setup_arch             = pmac_setup_arch,
 616         .show_cpuinfo           = pmac_show_cpuinfo,
 617         .init_IRQ               = pmac_pic_init,
 618         .get_irq                = NULL, /* changed later */
 619         .pci_irq_fixup          = pmac_pci_irq_fixup,
 620         .restart                = pmac_restart,
 621         .halt                   = pmac_halt,
 622         .time_init              = pmac_time_init,
 623         .get_boot_time          = pmac_get_boot_time,
 624         .set_rtc_time           = pmac_set_rtc_time,
 625         .get_rtc_time           = pmac_get_rtc_time,
 626         .calibrate_decr         = pmac_calibrate_decr,
 627         .feature_call           = pmac_do_feature_call,
 628         .progress               = udbg_progress,
 629 #ifdef CONFIG_PPC64
 630         .power_save             = power4_idle,
 631         .enable_pmcs            = power4_enable_pmcs,
 632 #endif /* CONFIG_PPC64 */
 633 #ifdef CONFIG_PPC32
 634         .pcibios_after_init     = pmac_pcibios_after_init,
 635         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 636 #endif
 637 };