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/system.h>
  61 #include <asm/pgtable.h>
  62 #include <asm/io.h>
  63 #include <asm/pci-bridge.h>
  64 #include <asm/ohare.h>
  65 #include <asm/mediabay.h>
  66 #include <asm/machdep.h>
  67 #include <asm/dma.h>
  68 #include <asm/cputable.h>
  69 #include <asm/btext.h>
  70 #include <asm/pmac_feature.h>
  71 #include <asm/time.h>
  72 #include <asm/mmu_context.h>
  73 #include <asm/iommu.h>
  74 #include <asm/smu.h>
  75 #include <asm/pmc.h>
  76 #include <asm/udbg.h>
  77
  78 #include "pmac.h"
  79
  80 #undef SHOW_GATWICK_IRQS
  81
  82 int ppc_override_l2cr = 0;
  83 int ppc_override_l2cr_value;
  84 int has_l2cache = 0;
  85
  86 int pmac_newworld;
  87
  88 static int current_root_goodness = -1;
  89
  90 extern struct machdep_calls pmac_md;
  91
  92 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  93
  94 #ifdef CONFIG_PPC64
  95 int sccdbg;
  96 #endif
  97
  98 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  99 EXPORT_SYMBOL(sys_ctrler);
 100
 101 #ifdef CONFIG_PMAC_SMU
 102 unsigned long smu_cmdbuf_abs;
 103 EXPORT_SYMBOL(smu_cmdbuf_abs);
 104 #endif
 105
 106 static void pmac_show_cpuinfo(struct seq_file *m)
 107 {
 108         struct device_node *np;
 109         const char *pp;
 110         int plen;
 111         int mbmodel;
 112         unsigned int mbflags;
 113         char* mbname;
 114
 115         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 116                                     PMAC_MB_INFO_MODEL, 0);
 117         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 118                                     PMAC_MB_INFO_FLAGS, 0);
 119         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 120                               (long) &mbname) != 0)
 121                 mbname = "Unknown";
 122
 123         /* find motherboard type */
 124         seq_printf(m, "machine\t\t: ");
 125         np = of_find_node_by_path("/");
 126         if (np != NULL) {
 127                 pp = of_get_property(np, "model", NULL);
 128                 if (pp != NULL)
 129                         seq_printf(m, "%s\n", pp);
 130                 else
 131                         seq_printf(m, "PowerMac\n");
 132                 pp = of_get_property(np, "compatible", &plen);
 133                 if (pp != NULL) {
 134                         seq_printf(m, "motherboard\t:");
 135                         while (plen > 0) {
 136                                 int l = strlen(pp) + 1;
 137                                 seq_printf(m, " %s", pp);
 138                                 plen -= l;
 139                                 pp += l;
 140                         }
 141                         seq_printf(m, "\n");
 142                 }
 143                 of_node_put(np);
 144         } else
 145                 seq_printf(m, "PowerMac\n");
 146
 147         /* print parsed model */
 148         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 149         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 150
 151         /* find l2 cache info */
 152         np = of_find_node_by_name(NULL, "l2-cache");
 153         if (np == NULL)
 154                 np = of_find_node_by_type(NULL, "cache");
 155         if (np != NULL) {
 156                 const unsigned int *ic =
 157                         of_get_property(np, "i-cache-size", NULL);
 158                 const unsigned int *dc =
 159                         of_get_property(np, "d-cache-size", NULL);
 160                 seq_printf(m, "L2 cache\t:");
 161                 has_l2cache = 1;
 162                 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
 163                         seq_printf(m, " %dK unified", *dc / 1024);
 164                 } else {
 165                         if (ic)
 166                                 seq_printf(m, " %dK instruction", *ic / 1024);
 167                         if (dc)
 168                                 seq_printf(m, "%s %dK data",
 169                                            (ic? " +": ""), *dc / 1024);
 170                 }
 171                 pp = of_get_property(np, "ram-type", NULL);
 172                 if (pp)
 173                         seq_printf(m, " %s", pp);
 174                 seq_printf(m, "\n");
 175                 of_node_put(np);
 176         }
 177
 178         /* Indicate newworld/oldworld */
 179         seq_printf(m, "pmac-generation\t: %s\n",
 180                    pmac_newworld ? "NewWorld" : "OldWorld");
 181 }
 182
 183 #ifndef CONFIG_ADB_CUDA
 184 int find_via_cuda(void)
 185 {
 186         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 187
 188         if (!dn)
 189                 return 0;
 190         of_node_put(dn);
 191         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 192         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 193         return 0;
 194 }
 195 #endif
 196
 197 #ifndef CONFIG_ADB_PMU
 198 int find_via_pmu(void)
 199 {
 200         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 201
 202         if (!dn)
 203                 return 0;
 204         of_node_put(dn);
 205         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 206         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 207         return 0;
 208 }
 209 #endif
 210
 211 #ifndef CONFIG_PMAC_SMU
 212 int smu_init(void)
 213 {
 214         /* should check and warn if SMU is present */
 215         return 0;
 216 }
 217 #endif
 218
 219 #ifdef CONFIG_PPC32
 220 static volatile u32 *sysctrl_regs;
 221
 222 static void __init ohare_init(void)
 223 {
 224         struct device_node *dn;
 225
 226         /* this area has the CPU identification register
 227            and some registers used by smp boards */
 228         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 229
 230         /*
 231          * Turn on the L2 cache.
 232          * We assume that we have a PSX memory controller iff
 233          * we have an ohare I/O controller.
 234          */
 235         dn = of_find_node_by_name(NULL, "ohare");
 236         if (dn) {
 237                 of_node_put(dn);
 238                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 239                         if (sysctrl_regs[4] & 0x10)
 240                                 sysctrl_regs[4] |= 0x04000020;
 241                         else
 242                                 sysctrl_regs[4] |= 0x04000000;
 243                         if(has_l2cache)
 244                                 printk(KERN_INFO "Level 2 cache enabled\n");
 245                 }
 246         }
 247 }
 248
 249 static void __init l2cr_init(void)
 250 {
 251         /* Checks "l2cr-value" property in the registry */
 252         if (cpu_has_feature(CPU_FTR_L2CR)) {
 253                 struct device_node *np = of_find_node_by_name(NULL, "cpus");
 254                 if (np == 0)
 255                         np = of_find_node_by_type(NULL, "cpu");
 256                 if (np != 0) {
 257                         const unsigned int *l2cr =
 258                                 of_get_property(np, "l2cr-value", NULL);
 259                         if (l2cr != 0) {
 260                                 ppc_override_l2cr = 1;
 261                                 ppc_override_l2cr_value = *l2cr;
 262                                 _set_L2CR(0);
 263                                 _set_L2CR(ppc_override_l2cr_value);
 264                         }
 265                         of_node_put(np);
 266                 }
 267         }
 268
 269         if (ppc_override_l2cr)
 270                 printk(KERN_INFO "L2CR overridden (0x%x), "
 271                        "backside cache is %s\n",
 272                        ppc_override_l2cr_value,
 273                        (ppc_override_l2cr_value & 0x80000000)
 274                                 ? "enabled" : "disabled");
 275 }
 276 #endif
 277
 278 static void __init pmac_setup_arch(void)
 279 {
 280         struct device_node *cpu, *ic;
 281         const int *fp;
 282         unsigned long pvr;
 283
 284         pvr = PVR_VER(mfspr(SPRN_PVR));
 285
 286         /* Set loops_per_jiffy to a half-way reasonable value,
 287            for use until calibrate_delay gets called. */
 288         loops_per_jiffy = 50000000 / HZ;
 289         cpu = of_find_node_by_type(NULL, "cpu");
 290         if (cpu != NULL) {
 291                 fp = of_get_property(cpu, "clock-frequency", NULL);
 292                 if (fp != NULL) {
 293                         if (pvr >= 0x30 && pvr < 0x80)
 294                                 /* PPC970 etc. */
 295                                 loops_per_jiffy = *fp / (3 * HZ);
 296                         else if (pvr == 4 || pvr >= 8)
 297                                 /* 604, G3, G4 etc. */
 298                                 loops_per_jiffy = *fp / HZ;
 299                         else
 300                                 /* 601, 603, etc. */
 301                                 loops_per_jiffy = *fp / (2 * HZ);
 302                 }
 303                 of_node_put(cpu);
 304         }
 305
 306         /* See if newworld or oldworld */
 307         ic = of_find_node_with_property(NULL, "interrupt-controller");
 308         if (ic) {
 309                 pmac_newworld = 1;
 310                 of_node_put(ic);
 311         }
 312
 313         /* Lookup PCI hosts */
 314         pmac_pci_init();
 315
 316 #ifdef CONFIG_PPC32
 317         ohare_init();
 318         l2cr_init();
 319 #endif /* CONFIG_PPC32 */
 320
 321         find_via_cuda();
 322         find_via_pmu();
 323         smu_init();
 324
 325 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
 326     defined(CONFIG_PPC64)
 327         pmac_nvram_init();
 328 #endif
 329
 330 #ifdef CONFIG_PPC32
 331 #ifdef CONFIG_BLK_DEV_INITRD
 332         if (initrd_start)
 333                 ROOT_DEV = Root_RAM0;
 334         else
 335 #endif
 336                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 337 #endif
 338
 339 #ifdef CONFIG_ADB
 340         if (strstr(cmd_line, "adb_sync")) {
 341                 extern int __adb_probe_sync;
 342                 __adb_probe_sync = 1;
 343         }
 344 #endif /* CONFIG_ADB */
 345 }
 346
 347 #ifdef CONFIG_SCSI
 348 void note_scsi_host(struct device_node *node, void *host)
 349 {
 350 }
 351 EXPORT_SYMBOL(note_scsi_host);
 352 #endif
 353
 354 static int initializing = 1;
 355
 356 static int pmac_late_init(void)
 357 {
 358         initializing = 0;
 359         return 0;
 360 }
 361 machine_late_initcall(powermac, pmac_late_init);
 362
 363 /*
 364  * This is __init_refok because we check for "initializing" before
 365  * touching any of the __init sensitive things and "initializing"
 366  * will be false after __init time. This can't be __init because it
 367  * can be called whenever a disk is first accessed.
 368  */
 369 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
 370 {
 371         char *p;
 372
 373         if (!initializing)
 374                 return;
 375         if ((goodness <= current_root_goodness) &&
 376             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 377                 return;
 378         p = strstr(boot_command_line, "root=");
 379         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 380                 return;
 381
 382         ROOT_DEV = dev + part;
 383         current_root_goodness = goodness;
 384 }
 385
 386 #ifdef CONFIG_ADB_CUDA
 387 static void cuda_restart(void)
 388 {
 389         struct adb_request req;
 390
 391         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 392         for (;;)
 393                 cuda_poll();
 394 }
 395
 396 static void cuda_shutdown(void)
 397 {
 398         struct adb_request req;
 399
 400         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 401         for (;;)
 402                 cuda_poll();
 403 }
 404
 405 #else
 406 #define cuda_restart()
 407 #define cuda_shutdown()
 408 #endif
 409
 410 #ifndef CONFIG_ADB_PMU
 411 #define pmu_restart()
 412 #define pmu_shutdown()
 413 #endif
 414
 415 #ifndef CONFIG_PMAC_SMU
 416 #define smu_restart()
 417 #define smu_shutdown()
 418 #endif
 419
 420 static void pmac_restart(char *cmd)
 421 {
 422         switch (sys_ctrler) {
 423         case SYS_CTRLER_CUDA:
 424                 cuda_restart();
 425                 break;
 426         case SYS_CTRLER_PMU:
 427                 pmu_restart();
 428                 break;
 429         case SYS_CTRLER_SMU:
 430                 smu_restart();
 431                 break;
 432         default: ;
 433         }
 434 }
 435
 436 static void pmac_power_off(void)
 437 {
 438         switch (sys_ctrler) {
 439         case SYS_CTRLER_CUDA:
 440                 cuda_shutdown();
 441                 break;
 442         case SYS_CTRLER_PMU:
 443                 pmu_shutdown();
 444                 break;
 445         case SYS_CTRLER_SMU:
 446                 smu_shutdown();
 447                 break;
 448         default: ;
 449         }
 450 }
 451
 452 static void
 453 pmac_halt(void)
 454 {
 455         pmac_power_off();
 456 }
 457
 458 /*
 459  * Early initialization.
 460  */
 461 static void __init pmac_init_early(void)
 462 {
 463         /* Enable early btext debug if requested */
 464         if (strstr(cmd_line, "btextdbg")) {
 465                 udbg_adb_init_early();
 466                 register_early_udbg_console();
 467         }
 468
 469         /* Probe motherboard chipset */
 470         pmac_feature_init();
 471
 472         /* Initialize debug stuff */
 473         udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
 474         udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
 475
 476 #ifdef CONFIG_PPC64
 477         iommu_init_early_dart();
 478 #endif
 479
 480         /* SMP Init has to be done early as we need to patch up
 481          * cpu_possible_mask before interrupt stacks are allocated
 482          * or kaboom...
 483          */
 484 #ifdef CONFIG_SMP
 485         pmac_setup_smp();
 486 #endif
 487 }
 488
 489 static int __init pmac_declare_of_platform_devices(void)
 490 {
 491         struct device_node *np;
 492
 493         if (machine_is(chrp))
 494                 return -1;
 495
 496         np = of_find_node_by_name(NULL, "valkyrie");
 497         if (np)
 498                 of_platform_device_create(np, "valkyrie", NULL);
 499         np = of_find_node_by_name(NULL, "platinum");
 500         if (np)
 501                 of_platform_device_create(np, "platinum", NULL);
 502         np = of_find_node_by_type(NULL, "smu");
 503         if (np) {
 504                 of_platform_device_create(np, "smu", NULL);
 505                 of_node_put(np);
 506         }
 507         np = of_find_node_by_type(NULL, "fcu");
 508         if (np == NULL) {
 509                 /* Some machines have strangely broken device-tree */
 510                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 511         }
 512         if (np) {
 513                 of_platform_device_create(np, "temperature", NULL);
 514                 of_node_put(np);
 515         }
 516
 517         return 0;
 518 }
 519 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 520
 521 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 522 /*
 523  * This is called very early, as part of console_init() (typically just after
 524  * time_init()). This function is respondible for trying to find a good
 525  * default console on serial ports. It tries to match the open firmware
 526  * default output with one of the available serial console drivers.
 527  */
 528 static int __init check_pmac_serial_console(void)
 529 {
 530         struct device_node *prom_stdout = NULL;
 531         int offset = 0;
 532         const char *name;
 533 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 534         char *devname = "ttyS";
 535 #else
 536         char *devname = "ttyPZ";
 537 #endif
 538
 539         pr_debug(" -> check_pmac_serial_console()\n");
 540
 541         /* The user has requested a console so this is already set up. */
 542         if (strstr(boot_command_line, "console=")) {
 543                 pr_debug(" console was specified !\n");
 544                 return -EBUSY;
 545         }
 546
 547         if (!of_chosen) {
 548                 pr_debug(" of_chosen is NULL !\n");
 549                 return -ENODEV;
 550         }
 551
 552         /* We are getting a weird phandle from OF ... */
 553         /* ... So use the full path instead */
 554         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 555         if (name == NULL) {
 556                 pr_debug(" no linux,stdout-path !\n");
 557                 return -ENODEV;
 558         }
 559         prom_stdout = of_find_node_by_path(name);
 560         if (!prom_stdout) {
 561                 pr_debug(" can't find stdout package %s !\n", name);
 562                 return -ENODEV;
 563         }
 564         pr_debug("stdout is %s\n", prom_stdout->full_name);
 565
 566         name = of_get_property(prom_stdout, "name", NULL);
 567         if (!name) {
 568                 pr_debug(" stdout package has no name !\n");
 569                 goto not_found;
 570         }
 571
 572         if (strcmp(name, "ch-a") == 0)
 573                 offset = 0;
 574         else if (strcmp(name, "ch-b") == 0)
 575                 offset = 1;
 576         else
 577                 goto not_found;
 578         of_node_put(prom_stdout);
 579
 580         pr_debug("Found serial console at %s%d\n", devname, offset);
 581
 582         return add_preferred_console(devname, offset, NULL);
 583
 584  not_found:
 585         pr_debug("No preferred console found !\n");
 586         of_node_put(prom_stdout);
 587         return -ENODEV;
 588 }
 589 console_initcall(check_pmac_serial_console);
 590
 591 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 592
 593 /*
 594  * Called very early, MMU is off, device-tree isn't unflattened
 595  */
 596 static int __init pmac_probe(void)
 597 {
 598         unsigned long root = of_get_flat_dt_root();
 599
 600         if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 601             !of_flat_dt_is_compatible(root, "MacRISC"))
 602                 return 0;
 603
 604 #ifdef CONFIG_PPC64
 605         /*
 606          * On U3, the DART (iommu) must be allocated now since it
 607          * has an impact on htab_initialize (due to the large page it
 608          * occupies having to be broken up so the DART itself is not
 609          * part of the cacheable linar mapping
 610          */
 611         alloc_dart_table();
 612
 613         hpte_init_native();
 614 #endif
 615
 616 #ifdef CONFIG_PPC32
 617         /* isa_io_base gets set in pmac_pci_init */
 618         ISA_DMA_THRESHOLD = ~0L;
 619         DMA_MODE_READ = 1;
 620         DMA_MODE_WRITE = 2;
 621 #endif /* CONFIG_PPC32 */
 622
 623 #ifdef CONFIG_PMAC_SMU
 624         /*
 625          * SMU based G5s need some memory below 2Gb, at least the current
 626          * driver needs that. We have to allocate it now. We allocate 4k
 627          * (1 small page) for now.
 628          */
 629         smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
 630 #endif /* CONFIG_PMAC_SMU */
 631
 632         return 1;
 633 }
 634
 635 #ifdef CONFIG_PPC64
 636 /* Move that to pci.c */
 637 static int pmac_pci_probe_mode(struct pci_bus *bus)
 638 {
 639         struct device_node *node = pci_bus_to_OF_node(bus);
 640
 641         /* We need to use normal PCI probing for the AGP bus,
 642          * since the device for the AGP bridge isn't in the tree.
 643          * Same for the PCIe host on U4 and the HT host bridge.
 644          */
 645         if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
 646                                   of_device_is_compatible(node, "u4-pcie") ||
 647                                   of_device_is_compatible(node, "u3-ht")))
 648                 return PCI_PROBE_NORMAL;
 649         return PCI_PROBE_DEVTREE;
 650 }
 651 #endif /* CONFIG_PPC64 */
 652
 653 define_machine(powermac) {
 654         .name                   = "PowerMac",
 655         .probe                  = pmac_probe,
 656         .setup_arch             = pmac_setup_arch,
 657         .init_early             = pmac_init_early,
 658         .show_cpuinfo           = pmac_show_cpuinfo,
 659         .init_IRQ               = pmac_pic_init,
 660         .get_irq                = NULL, /* changed later */
 661         .pci_irq_fixup          = pmac_pci_irq_fixup,
 662         .restart                = pmac_restart,
 663         .power_off              = pmac_power_off,
 664         .halt                   = pmac_halt,
 665         .time_init              = pmac_time_init,
 666         .get_boot_time          = pmac_get_boot_time,
 667         .set_rtc_time           = pmac_set_rtc_time,
 668         .get_rtc_time           = pmac_get_rtc_time,
 669         .calibrate_decr         = pmac_calibrate_decr,
 670         .feature_call           = pmac_do_feature_call,
 671         .progress               = udbg_progress,
 672 #ifdef CONFIG_PPC64
 673         .pci_probe_mode         = pmac_pci_probe_mode,
 674         .power_save             = power4_idle,
 675         .enable_pmcs            = power4_enable_pmcs,
 676 #endif /* CONFIG_PPC64 */
 677 #ifdef CONFIG_PPC32
 678         .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
 679         .pcibios_after_init     = pmac_pcibios_after_init,
 680         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 681 #endif
 682 };