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 #include <linux/memblock.h>
  56
  57 #include <asm/reg.h>
  58 #include <asm/sections.h>
  59 #include <asm/prom.h>
  60 #include <asm/pgtable.h>
  61 #include <asm/io.h>
  62 #include <asm/pci-bridge.h>
  63 #include <asm/ohare.h>
  64 #include <asm/mediabay.h>
  65 #include <asm/machdep.h>
  66 #include <asm/dma.h>
  67 #include <asm/cputable.h>
  68 #include <asm/btext.h>
  69 #include <asm/pmac_feature.h>
  70 #include <asm/time.h>
  71 #include <asm/mmu_context.h>
  72 #include <asm/iommu.h>
  73 #include <asm/smu.h>
  74 #include <asm/pmc.h>
  75 #include <asm/udbg.h>
  76
  77 #include "pmac.h"
  78
  79 #undef SHOW_GATWICK_IRQS
  80
  81 int ppc_override_l2cr = 0;
  82 int ppc_override_l2cr_value;
  83 int has_l2cache = 0;
  84
  85 int pmac_newworld;
  86
  87 static int current_root_goodness = -1;
  88
  89 extern struct machdep_calls pmac_md;
  90
  91 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  92
  93 #ifdef CONFIG_PPC64
  94 int sccdbg;
  95 #endif
  96
  97 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  98 EXPORT_SYMBOL(sys_ctrler);
  99
 100 #ifdef CONFIG_PMAC_SMU
 101 unsigned long smu_cmdbuf_abs;
 102 EXPORT_SYMBOL(smu_cmdbuf_abs);
 103 #endif
 104
 105 static void pmac_show_cpuinfo(struct seq_file *m)
 106 {
 107         struct device_node *np;
 108         const char *pp;
 109         int plen;
 110         int mbmodel;
 111         unsigned int mbflags;
 112         char* mbname;
 113
 114         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 115                                     PMAC_MB_INFO_MODEL, 0);
 116         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 117                                     PMAC_MB_INFO_FLAGS, 0);
 118         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 119                               (long) &mbname) != 0)
 120                 mbname = "Unknown";
 121
 122         /* find motherboard type */
 123         seq_printf(m, "machine\t\t: ");
 124         np = of_find_node_by_path("/");
 125         if (np != NULL) {
 126                 pp = of_get_property(np, "model", NULL);
 127                 if (pp != NULL)
 128                         seq_printf(m, "%s\n", pp);
 129                 else
 130                         seq_printf(m, "PowerMac\n");
 131                 pp = of_get_property(np, "compatible", &plen);
 132                 if (pp != NULL) {
 133                         seq_printf(m, "motherboard\t:");
 134                         while (plen > 0) {
 135                                 int l = strlen(pp) + 1;
 136                                 seq_printf(m, " %s", pp);
 137                                 plen -= l;
 138                                 pp += l;
 139                         }
 140                         seq_printf(m, "\n");
 141                 }
 142                 of_node_put(np);
 143         } else
 144                 seq_printf(m, "PowerMac\n");
 145
 146         /* print parsed model */
 147         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 148         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 149
 150         /* find l2 cache info */
 151         np = of_find_node_by_name(NULL, "l2-cache");
 152         if (np == NULL)
 153                 np = of_find_node_by_type(NULL, "cache");
 154         if (np != NULL) {
 155                 const unsigned int *ic =
 156                         of_get_property(np, "i-cache-size", NULL);
 157                 const unsigned int *dc =
 158                         of_get_property(np, "d-cache-size", NULL);
 159                 seq_printf(m, "L2 cache\t:");
 160                 has_l2cache = 1;
 161                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
 162                         seq_printf(m, " %dK unified", *dc / 1024);
 163                 } else {
 164                         if (ic)
 165                                 seq_printf(m, " %dK instruction", *ic / 1024);
 166                         if (dc)
 167                                 seq_printf(m, "%s %dK data",
 168                                            (ic? " +": ""), *dc / 1024);
 169                 }
 170                 pp = of_get_property(np, "ram-type", NULL);
 171                 if (pp)
 172                         seq_printf(m, " %s", pp);
 173                 seq_printf(m, "\n");
 174                 of_node_put(np);
 175         }
 176
 177         /* Indicate newworld/oldworld */
 178         seq_printf(m, "pmac-generation\t: %s\n",
 179                    pmac_newworld ? "NewWorld" : "OldWorld");
 180 }
 181
 182 #ifndef CONFIG_ADB_CUDA
 183 int find_via_cuda(void)
 184 {
 185         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 186
 187         if (!dn)
 188                 return 0;
 189         of_node_put(dn);
 190         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 191         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 192         return 0;
 193 }
 194 #endif
 195
 196 #ifndef CONFIG_ADB_PMU
 197 int find_via_pmu(void)
 198 {
 199         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 200
 201         if (!dn)
 202                 return 0;
 203         of_node_put(dn);
 204         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 205         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 206         return 0;
 207 }
 208 #endif
 209
 210 #ifndef CONFIG_PMAC_SMU
 211 int smu_init(void)
 212 {
 213         /* should check and warn if SMU is present */
 214         return 0;
 215 }
 216 #endif
 217
 218 #ifdef CONFIG_PPC32
 219 static volatile u32 *sysctrl_regs;
 220
 221 static void __init ohare_init(void)
 222 {
 223         struct device_node *dn;
 224
 225         /* this area has the CPU identification register
 226            and some registers used by smp boards */
 227         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 228
 229         /*
 230          * Turn on the L2 cache.
 231          * We assume that we have a PSX memory controller iff
 232          * we have an ohare I/O controller.
 233          */
 234         dn = of_find_node_by_name(NULL, "ohare");
 235         if (dn) {
 236                 of_node_put(dn);
 237                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 238                         if (sysctrl_regs[4] & 0x10)
 239                                 sysctrl_regs[4] |= 0x04000020;
 240                         else
 241                                 sysctrl_regs[4] |= 0x04000000;
 242                         if(has_l2cache)
 243                                 printk(KERN_INFO "Level 2 cache enabled\n");
 244                 }
 245         }
 246 }
 247
 248 static void __init l2cr_init(void)
 249 {
 250         /* Checks "l2cr-value" property in the registry */
 251         if (cpu_has_feature(CPU_FTR_L2CR)) {
 252                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
 253                 if (np == 0)
 254                         np = of_find_node_by_type(NULL, "cpu");
 255                 if (np != 0) {
 256                         const unsigned int *l2cr =
 257                                 of_get_property(np, "l2cr-value", NULL);
 258                         if (l2cr != 0) {
 259                                 ppc_override_l2cr = 1;
 260                                 ppc_override_l2cr_value = *l2cr;
 261                                 _set_L2CR(0);
 262                                 _set_L2CR(ppc_override_l2cr_value);
 263                         }
 264                         of_node_put(np);
 265                 }
 266         }
 267
 268         if (ppc_override_l2cr)
 269                 printk(KERN_INFO "L2CR overridden (0x%x), "
 270                        "backside cache is %s\n",
 271                        ppc_override_l2cr_value,
 272                        (ppc_override_l2cr_value & 0x80000000)
 273                                 ? "enabled" : "disabled");
 274 }
 275 #endif
 276
 277 static void __init pmac_setup_arch(void)
 278 {
 279         struct device_node *cpu, *ic;
 280         const int *fp;
 281         unsigned long pvr;
 282
 283         pvr = PVR_VER(mfspr(SPRN_PVR));
 284
 285         /* Set loops_per_jiffy to a half-way reasonable value,
 286            for use until calibrate_delay gets called. */
 287         loops_per_jiffy = 50000000 / HZ;
 288         cpu = of_find_node_by_type(NULL, "cpu");
 289         if (cpu != NULL) {
 290                 fp = of_get_property(cpu, "clock-frequency", NULL);
 291                 if (fp != NULL) {
 292                         if (pvr >= 0x30 && pvr < 0x80)
 293                                 /* PPC970 etc. */
 294                                 loops_per_jiffy = *fp / (3 * HZ);
 295                         else if (pvr == 4 || pvr >= 8)
 296                                 /* 604, G3, G4 etc. */
 297                                 loops_per_jiffy = *fp / HZ;
 298                         else
 299                                 /* 601, 603, etc. */
 300                                 loops_per_jiffy = *fp / (2 * HZ);
 301                 }
 302                 of_node_put(cpu);
 303         }
 304
 305         /* See if newworld or oldworld */
 306         ic = of_find_node_with_property(NULL, "interrupt-controller");
 307         if (ic) {
 308                 pmac_newworld = 1;
 309                 of_node_put(ic);
 310         }
 311
 312         /* Lookup PCI hosts */
 313         pmac_pci_init();
 314
 315 #ifdef CONFIG_PPC32
 316         ohare_init();
 317         l2cr_init();
 318 #endif /* CONFIG_PPC32 */
 319
 320         find_via_cuda();
 321         find_via_pmu();
 322         smu_init();
 323
 324 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
 325     defined(CONFIG_PPC64)
 326         pmac_nvram_init();
 327 #endif
 328
 329 #ifdef CONFIG_PPC32
 330 #ifdef CONFIG_BLK_DEV_INITRD
 331         if (initrd_start)
 332                 ROOT_DEV = Root_RAM0;
 333         else
 334 #endif
 335                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 336 #endif
 337
 338 #ifdef CONFIG_ADB
 339         if (strstr(boot_command_line, "adb_sync")) {
 340                 extern int __adb_probe_sync;
 341                 __adb_probe_sync = 1;
 342         }
 343 #endif /* CONFIG_ADB */
 344 }
 345
 346 #ifdef CONFIG_SCSI
 347 void note_scsi_host(struct device_node *node, void *host)
 348 {
 349 }
 350 EXPORT_SYMBOL(note_scsi_host);
 351 #endif
 352
 353 static int initializing = 1;
 354
 355 static int pmac_late_init(void)
 356 {
 357         initializing = 0;
 358         return 0;
 359 }
 360 machine_late_initcall(powermac, pmac_late_init);
 361
 362 /*
 363  * This is __init_refok because we check for "initializing" before
 364  * touching any of the __init sensitive things and "initializing"
 365  * will be false after __init time. This can't be __init because it
 366  * can be called whenever a disk is first accessed.
 367  */
 368 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
 369 {
 370         char *p;
 371
 372         if (!initializing)
 373                 return;
 374         if ((goodness <= current_root_goodness) &&
 375             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 376                 return;
 377         p = strstr(boot_command_line, "root=");
 378         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 379                 return;
 380
 381         ROOT_DEV = dev + part;
 382         current_root_goodness = goodness;
 383 }
 384
 385 #ifdef CONFIG_ADB_CUDA
 386 static void cuda_restart(void)
 387 {
 388         struct adb_request req;
 389
 390         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 391         for (;;)
 392                 cuda_poll();
 393 }
 394
 395 static void cuda_shutdown(void)
 396 {
 397         struct adb_request req;
 398
 399         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 400         for (;;)
 401                 cuda_poll();
 402 }
 403
 404 #else
 405 #define cuda_restart()
 406 #define cuda_shutdown()
 407 #endif
 408
 409 #ifndef CONFIG_ADB_PMU
 410 #define pmu_restart()
 411 #define pmu_shutdown()
 412 #endif
 413
 414 #ifndef CONFIG_PMAC_SMU
 415 #define smu_restart()
 416 #define smu_shutdown()
 417 #endif
 418
 419 static void pmac_restart(char *cmd)
 420 {
 421         switch (sys_ctrler) {
 422         case SYS_CTRLER_CUDA:
 423                 cuda_restart();
 424                 break;
 425         case SYS_CTRLER_PMU:
 426                 pmu_restart();
 427                 break;
 428         case SYS_CTRLER_SMU:
 429                 smu_restart();
 430                 break;
 431         default: ;
 432         }
 433 }
 434
 435 static void pmac_power_off(void)
 436 {
 437         switch (sys_ctrler) {
 438         case SYS_CTRLER_CUDA:
 439                 cuda_shutdown();
 440                 break;
 441         case SYS_CTRLER_PMU:
 442                 pmu_shutdown();
 443                 break;
 444         case SYS_CTRLER_SMU:
 445                 smu_shutdown();
 446                 break;
 447         default: ;
 448         }
 449 }
 450
 451 static void
 452 pmac_halt(void)
 453 {
 454         pmac_power_off();
 455 }
 456
 457 /*
 458  * Early initialization.
 459  */
 460 static void __init pmac_init_early(void)
 461 {
 462         /* Enable early btext debug if requested */
 463         if (strstr(boot_command_line, "btextdbg")) {
 464                 udbg_adb_init_early();
 465                 register_early_udbg_console();
 466         }
 467
 468         /* Probe motherboard chipset */
 469         pmac_feature_init();
 470
 471         /* Initialize debug stuff */
 472         udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 473         udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 474
 475 #ifdef CONFIG_PPC64
 476         iommu_init_early_dart(&pmac_pci_controller_ops);
 477 #endif
 478
 479         /* SMP Init has to be done early as we need to patch up
 480          * cpu_possible_mask before interrupt stacks are allocated
 481          * or kaboom...
 482          */
 483 #ifdef CONFIG_SMP
 484         pmac_setup_smp();
 485 #endif
 486 }
 487
 488 static int __init pmac_declare_of_platform_devices(void)
 489 {
 490         struct device_node *np;
 491
 492         if (machine_is(chrp))
 493                 return -1;
 494
 495         np = of_find_node_by_name(NULL, "valkyrie");
 496         if (np) {
 497                 of_platform_device_create(np, "valkyrie", NULL);
 498                 of_node_put(np);
 499         }
 500         np = of_find_node_by_name(NULL, "platinum");
 501         if (np) {
 502                 of_platform_device_create(np, "platinum", NULL);
 503                 of_node_put(np);
 504         }
 505         np = of_find_node_by_type(NULL, "smu");
 506         if (np) {
 507                 of_platform_device_create(np, "smu", NULL);
 508                 of_node_put(np);
 509         }
 510         np = of_find_node_by_type(NULL, "fcu");
 511         if (np == NULL) {
 512                 /* Some machines have strangely broken device-tree */
 513                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 514         }
 515         if (np) {
 516                 of_platform_device_create(np, "temperature", NULL);
 517                 of_node_put(np);
 518         }
 519
 520         return 0;
 521 }
 522 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 523
 524 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 525 /*
 526  * This is called very early, as part of console_init() (typically just after
 527  * time_init()). This function is respondible for trying to find a good
 528  * default console on serial ports. It tries to match the open firmware
 529  * default output with one of the available serial console drivers.
 530  */
 531 static int __init check_pmac_serial_console(void)
 532 {
 533         struct device_node *prom_stdout = NULL;
 534         int offset = 0;
 535         const char *name;
 536 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 537         char *devname = "ttyS";
 538 #else
 539         char *devname = "ttyPZ";
 540 #endif
 541
 542         pr_debug(" -> check_pmac_serial_console()\n");
 543
 544         /* The user has requested a console so this is already set up. */
 545         if (strstr(boot_command_line, "console=")) {
 546                 pr_debug(" console was specified !\n");
 547                 return -EBUSY;
 548         }
 549
 550         if (!of_chosen) {
 551                 pr_debug(" of_chosen is NULL !\n");
 552                 return -ENODEV;
 553         }
 554
 555         /* We are getting a weird phandle from OF ... */
 556         /* ... So use the full path instead */
 557         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 558         if (name == NULL) {
 559                 pr_debug(" no linux,stdout-path !\n");
 560                 return -ENODEV;
 561         }
 562         prom_stdout = of_find_node_by_path(name);
 563         if (!prom_stdout) {
 564                 pr_debug(" can't find stdout package %s !\n", name);
 565                 return -ENODEV;
 566         }
 567         pr_debug("stdout is %s\n", prom_stdout->full_name);
 568
 569         name = of_get_property(prom_stdout, "name", NULL);
 570         if (!name) {
 571                 pr_debug(" stdout package has no name !\n");
 572                 goto not_found;
 573         }
 574
 575         if (strcmp(name, "ch-a") == 0)
 576                 offset = 0;
 577         else if (strcmp(name, "ch-b") == 0)
 578                 offset = 1;
 579         else
 580                 goto not_found;
 581         of_node_put(prom_stdout);
 582
 583         pr_debug("Found serial console at %s%d\n", devname, offset);
 584
 585         return add_preferred_console(devname, offset, NULL);
 586
 587  not_found:
 588         pr_debug("No preferred console found !\n");
 589         of_node_put(prom_stdout);
 590         return -ENODEV;
 591 }
 592 console_initcall(check_pmac_serial_console);
 593
 594 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 595
 596 /*
 597  * Called very early, MMU is off, device-tree isn't unflattened
 598  */
 599 static int __init pmac_probe(void)
 600 {
 601         unsigned long root = of_get_flat_dt_root();
 602
 603         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 604             !of_flat_dt_is_compatible(root, "MacRISC"))
 605                 return 0;
 606
 607 #ifdef CONFIG_PPC64
 608         /*
 609          * On U3, the DART (iommu) must be allocated now since it
 610          * has an impact on htab_initialize (due to the large page it
 611          * occupies having to be broken up so the DART itself is not
 612          * part of the cacheable linar mapping
 613          */
 614         alloc_dart_table();
 615
 616         hpte_init_native();
 617 #endif
 618
 619 #ifdef CONFIG_PPC32
 620         /* isa_io_base gets set in pmac_pci_init */
 621         ISA_DMA_THRESHOLD = ~0L;
 622         DMA_MODE_READ = 1;
 623         DMA_MODE_WRITE = 2;
 624 #endif /* CONFIG_PPC32 */
 625
 626 #ifdef CONFIG_PMAC_SMU
 627         /*
 628          * SMU based G5s need some memory below 2Gb, at least the current
 629          * driver needs that. We have to allocate it now. We allocate 4k
 630          * (1 small page) for now.
 631          */
 632         smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
 633 #endif /* CONFIG_PMAC_SMU */
 634
 635         pm_power_off = pmac_power_off;
 636
 637         return 1;
 638 }
 639
 640 define_machine(powermac) {
 641         .name                   = "PowerMac",
 642         .probe                  = pmac_probe,
 643         .setup_arch             = pmac_setup_arch,
 644         .init_early             = pmac_init_early,
 645         .show_cpuinfo           = pmac_show_cpuinfo,
 646         .init_IRQ               = pmac_pic_init,
 647         .get_irq                = NULL, /* changed later */
 648         .pci_irq_fixup          = pmac_pci_irq_fixup,
 649         .restart                = pmac_restart,
 650         .halt                   = pmac_halt,
 651         .time_init              = pmac_time_init,
 652         .get_boot_time          = pmac_get_boot_time,
 653         .set_rtc_time           = pmac_set_rtc_time,
 654         .get_rtc_time           = pmac_get_rtc_time,
 655         .calibrate_decr         = pmac_calibrate_decr,
 656         .feature_call           = pmac_do_feature_call,
 657         .progress               = udbg_progress,
 658 #ifdef CONFIG_PPC64
 659         .power_save             = power4_idle,
 660         .enable_pmcs            = power4_enable_pmcs,
 661 #endif /* CONFIG_PPC64 */
 662 #ifdef CONFIG_PPC32
 663         .pcibios_after_init     = pmac_pcibios_after_init,
 664         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 665 #endif
 666 };