linux/arch/powerpc/platforms/powermac/setup.c
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   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
  82int ppc_override_l2cr = 0;
  83int ppc_override_l2cr_value;
  84int has_l2cache = 0;
  85
  86int pmac_newworld;
  87
  88static int current_root_goodness = -1;
  89
  90extern struct machdep_calls pmac_md;
  91
  92#define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  93
  94#ifdef CONFIG_PPC64
  95int sccdbg;
  96#endif
  97
  98sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  99EXPORT_SYMBOL(sys_ctrler);
 100
 101#ifdef CONFIG_PMAC_SMU
 102unsigned long smu_cmdbuf_abs;
 103EXPORT_SYMBOL(smu_cmdbuf_abs);
 104#endif
 105
 106static 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
 184int 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
 198int 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
 212int smu_init(void)
 213{
 214        /* should check and warn if SMU is present */
 215        return 0;
 216}
 217#endif
 218
 219#ifdef CONFIG_PPC32
 220static volatile u32 *sysctrl_regs;
 221
 222static 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
 249static 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
 278static 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
 348void note_scsi_host(struct device_node *node, void *host)
 349{
 350}
 351EXPORT_SYMBOL(note_scsi_host);
 352#endif
 353
 354static int initializing = 1;
 355
 356static int pmac_late_init(void)
 357{
 358        initializing = 0;
 359        return 0;
 360}
 361machine_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 */
 369void __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
 387static 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
 396static 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
 420static 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
 436static 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
 452static void
 453pmac_halt(void)
 454{
 455        pmac_power_off();
 456}
 457
 458/* 
 459 * Early initialization.
 460 */
 461static 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
 489static 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                of_node_put(np);
 500        }
 501        np = of_find_node_by_name(NULL, "platinum");
 502        if (np) {
 503                of_platform_device_create(np, "platinum", NULL);
 504                of_node_put(np);
 505        }
 506        np = of_find_node_by_type(NULL, "smu");
 507        if (np) {
 508                of_platform_device_create(np, "smu", NULL);
 509                of_node_put(np);
 510        }
 511        np = of_find_node_by_type(NULL, "fcu");
 512        if (np == NULL) {
 513                /* Some machines have strangely broken device-tree */
 514                np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 515        }
 516        if (np) {
 517                of_platform_device_create(np, "temperature", NULL);
 518                of_node_put(np);
 519        }
 520
 521        return 0;
 522}
 523machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 524
 525#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 526/*
 527 * This is called very early, as part of console_init() (typically just after
 528 * time_init()). This function is respondible for trying to find a good
 529 * default console on serial ports. It tries to match the open firmware
 530 * default output with one of the available serial console drivers.
 531 */
 532static int __init check_pmac_serial_console(void)
 533{
 534        struct device_node *prom_stdout = NULL;
 535        int offset = 0;
 536        const char *name;
 537#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 538        char *devname = "ttyS";
 539#else
 540        char *devname = "ttyPZ";
 541#endif
 542
 543        pr_debug(" -> check_pmac_serial_console()\n");
 544
 545        /* The user has requested a console so this is already set up. */
 546        if (strstr(boot_command_line, "console=")) {
 547                pr_debug(" console was specified !\n");
 548                return -EBUSY;
 549        }
 550
 551        if (!of_chosen) {
 552                pr_debug(" of_chosen is NULL !\n");
 553                return -ENODEV;
 554        }
 555
 556        /* We are getting a weird phandle from OF ... */
 557        /* ... So use the full path instead */
 558        name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 559        if (name == NULL) {
 560                pr_debug(" no linux,stdout-path !\n");
 561                return -ENODEV;
 562        }
 563        prom_stdout = of_find_node_by_path(name);
 564        if (!prom_stdout) {
 565                pr_debug(" can't find stdout package %s !\n", name);
 566                return -ENODEV;
 567        }
 568        pr_debug("stdout is %s\n", prom_stdout->full_name);
 569
 570        name = of_get_property(prom_stdout, "name", NULL);
 571        if (!name) {
 572                pr_debug(" stdout package has no name !\n");
 573                goto not_found;
 574        }
 575
 576        if (strcmp(name, "ch-a") == 0)
 577                offset = 0;
 578        else if (strcmp(name, "ch-b") == 0)
 579                offset = 1;
 580        else
 581                goto not_found;
 582        of_node_put(prom_stdout);
 583
 584        pr_debug("Found serial console at %s%d\n", devname, offset);
 585
 586        return add_preferred_console(devname, offset, NULL);
 587
 588 not_found:
 589        pr_debug("No preferred console found !\n");
 590        of_node_put(prom_stdout);
 591        return -ENODEV;
 592}
 593console_initcall(check_pmac_serial_console);
 594
 595#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 596
 597/*
 598 * Called very early, MMU is off, device-tree isn't unflattened
 599 */
 600static int __init pmac_probe(void)
 601{
 602        unsigned long root = of_get_flat_dt_root();
 603
 604        if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
 605            !of_flat_dt_is_compatible(root, "MacRISC"))
 606                return 0;
 607
 608#ifdef CONFIG_PPC64
 609        /*
 610         * On U3, the DART (iommu) must be allocated now since it
 611         * has an impact on htab_initialize (due to the large page it
 612         * occupies having to be broken up so the DART itself is not
 613         * part of the cacheable linar mapping
 614         */
 615        alloc_dart_table();
 616
 617        hpte_init_native();
 618#endif
 619
 620#ifdef CONFIG_PPC32
 621        /* isa_io_base gets set in pmac_pci_init */
 622        ISA_DMA_THRESHOLD = ~0L;
 623        DMA_MODE_READ = 1;
 624        DMA_MODE_WRITE = 2;
 625#endif /* CONFIG_PPC32 */
 626
 627#ifdef CONFIG_PMAC_SMU
 628        /*
 629         * SMU based G5s need some memory below 2Gb, at least the current
 630         * driver needs that. We have to allocate it now. We allocate 4k
 631         * (1 small page) for now.
 632         */
 633        smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
 634#endif /* CONFIG_PMAC_SMU */
 635
 636        return 1;
 637}
 638
 639#ifdef CONFIG_PPC64
 640/* Move that to pci.c */
 641static int pmac_pci_probe_mode(struct pci_bus *bus)
 642{
 643        struct device_node *node = pci_bus_to_OF_node(bus);
 644
 645        /* We need to use normal PCI probing for the AGP bus,
 646         * since the device for the AGP bridge isn't in the tree.
 647         * Same for the PCIe host on U4 and the HT host bridge.
 648         */
 649        if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
 650                                  of_device_is_compatible(node, "u4-pcie") ||
 651                                  of_device_is_compatible(node, "u3-ht")))
 652                return PCI_PROBE_NORMAL;
 653        return PCI_PROBE_DEVTREE;
 654}
 655#endif /* CONFIG_PPC64 */
 656
 657define_machine(powermac) {
 658        .name                   = "PowerMac",
 659        .probe                  = pmac_probe,
 660        .setup_arch             = pmac_setup_arch,
 661        .init_early             = pmac_init_early,
 662        .show_cpuinfo           = pmac_show_cpuinfo,
 663        .init_IRQ               = pmac_pic_init,
 664        .get_irq                = NULL, /* changed later */
 665        .pci_irq_fixup          = pmac_pci_irq_fixup,
 666        .restart                = pmac_restart,
 667        .power_off              = pmac_power_off,
 668        .halt                   = pmac_halt,
 669        .time_init              = pmac_time_init,
 670        .get_boot_time          = pmac_get_boot_time,
 671        .set_rtc_time           = pmac_set_rtc_time,
 672        .get_rtc_time           = pmac_get_rtc_time,
 673        .calibrate_decr         = pmac_calibrate_decr,
 674        .feature_call           = pmac_do_feature_call,
 675        .progress               = udbg_progress,
 676#ifdef CONFIG_PPC64
 677        .pci_probe_mode         = pmac_pci_probe_mode,
 678        .power_save             = power4_idle,
 679        .enable_pmcs            = power4_enable_pmcs,
 680#endif /* CONFIG_PPC64 */
 681#ifdef CONFIG_PPC32
 682        .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
 683        .pcibios_after_init     = pmac_pcibios_after_init,
 684        .phys_mem_access_prot   = pci_phys_mem_access_prot,
 685#endif
 686};
 687