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
  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
  80int ppc_override_l2cr = 0;
  81int ppc_override_l2cr_value;
  82int has_l2cache = 0;
  83
  84int pmac_newworld;
  85
  86static int current_root_goodness = -1;
  87
  88extern struct machdep_calls pmac_md;
  89
  90#define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  91
  92#ifdef CONFIG_PPC64
  93int sccdbg;
  94#endif
  95
  96sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  97EXPORT_SYMBOL(sys_ctrler);
  98
  99static 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
 177int 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
 191int 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
 205int smu_init(void)
 206{
 207        /* should check and warn if SMU is present */
 208        return 0;
 209}
 210#endif
 211
 212#ifdef CONFIG_PPC32
 213static volatile u32 *sysctrl_regs;
 214
 215static 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
 242static 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
 271static 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
 340void note_scsi_host(struct device_node *node, void *host)
 341{
 342}
 343EXPORT_SYMBOL(note_scsi_host);
 344#endif
 345
 346static int initializing = 1;
 347
 348static int pmac_late_init(void)
 349{
 350        initializing = 0;
 351        return 0;
 352}
 353machine_late_initcall(powermac, pmac_late_init);
 354
 355/*
 356 * This is __ref because we check for "initializing" before
 357 * touching any of the __init sensitive things and "initializing"
 358 * will be false after __init time. This can't be __init because it
 359 * can be called whenever a disk is first accessed.
 360 */
 361void __ref note_bootable_part(dev_t dev, int part, int goodness)
 362{
 363        char *p;
 364
 365        if (!initializing)
 366                return;
 367        if ((goodness <= current_root_goodness) &&
 368            ROOT_DEV != DEFAULT_ROOT_DEVICE)
 369                return;
 370        p = strstr(boot_command_line, "root=");
 371        if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 372                return;
 373
 374        ROOT_DEV = dev + part;
 375        current_root_goodness = goodness;
 376}
 377
 378#ifdef CONFIG_ADB_CUDA
 379static void __noreturn cuda_restart(void)
 380{
 381        struct adb_request req;
 382
 383        cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 384        for (;;)
 385                cuda_poll();
 386}
 387
 388static void __noreturn cuda_shutdown(void)
 389{
 390        struct adb_request req;
 391
 392        cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 393        for (;;)
 394                cuda_poll();
 395}
 396
 397#else
 398#define cuda_restart()
 399#define cuda_shutdown()
 400#endif
 401
 402#ifndef CONFIG_ADB_PMU
 403#define pmu_restart()
 404#define pmu_shutdown()
 405#endif
 406
 407#ifndef CONFIG_PMAC_SMU
 408#define smu_restart()
 409#define smu_shutdown()
 410#endif
 411
 412static void __noreturn pmac_restart(char *cmd)
 413{
 414        switch (sys_ctrler) {
 415        case SYS_CTRLER_CUDA:
 416                cuda_restart();
 417                break;
 418        case SYS_CTRLER_PMU:
 419                pmu_restart();
 420                break;
 421        case SYS_CTRLER_SMU:
 422                smu_restart();
 423                break;
 424        default: ;
 425        }
 426        while (1) ;
 427}
 428
 429static void __noreturn pmac_power_off(void)
 430{
 431        switch (sys_ctrler) {
 432        case SYS_CTRLER_CUDA:
 433                cuda_shutdown();
 434                break;
 435        case SYS_CTRLER_PMU:
 436                pmu_shutdown();
 437                break;
 438        case SYS_CTRLER_SMU:
 439                smu_shutdown();
 440                break;
 441        default: ;
 442        }
 443        while (1) ;
 444}
 445
 446static void __noreturn
 447pmac_halt(void)
 448{
 449        pmac_power_off();
 450}
 451
 452/* 
 453 * Early initialization.
 454 */
 455static void __init pmac_init(void)
 456{
 457        /* Enable early btext debug if requested */
 458        if (strstr(boot_command_line, "btextdbg")) {
 459                udbg_adb_init_early();
 460                register_early_udbg_console();
 461        }
 462
 463        /* Probe motherboard chipset */
 464        pmac_feature_init();
 465
 466        /* Initialize debug stuff */
 467        udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 468        udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 469
 470#ifdef CONFIG_PPC64
 471        iommu_init_early_dart(&pmac_pci_controller_ops);
 472#endif
 473
 474        /* SMP Init has to be done early as we need to patch up
 475         * cpu_possible_mask before interrupt stacks are allocated
 476         * or kaboom...
 477         */
 478#ifdef CONFIG_SMP
 479        pmac_setup_smp();
 480#endif
 481}
 482
 483static int __init pmac_declare_of_platform_devices(void)
 484{
 485        struct device_node *np;
 486
 487        np = of_find_node_by_name(NULL, "valkyrie");
 488        if (np) {
 489                of_platform_device_create(np, "valkyrie", NULL);
 490                of_node_put(np);
 491        }
 492        np = of_find_node_by_name(NULL, "platinum");
 493        if (np) {
 494                of_platform_device_create(np, "platinum", NULL);
 495                of_node_put(np);
 496        }
 497        np = of_find_node_by_type(NULL, "smu");
 498        if (np) {
 499                of_platform_device_create(np, "smu", NULL);
 500                of_node_put(np);
 501        }
 502        np = of_find_node_by_type(NULL, "fcu");
 503        if (np == NULL) {
 504                /* Some machines have strangely broken device-tree */
 505                np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 506        }
 507        if (np) {
 508                of_platform_device_create(np, "temperature", NULL);
 509                of_node_put(np);
 510        }
 511
 512        return 0;
 513}
 514machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 515
 516#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 517/*
 518 * This is called very early, as part of console_init() (typically just after
 519 * time_init()). This function is respondible for trying to find a good
 520 * default console on serial ports. It tries to match the open firmware
 521 * default output with one of the available serial console drivers.
 522 */
 523static int __init check_pmac_serial_console(void)
 524{
 525        struct device_node *prom_stdout = NULL;
 526        int offset = 0;
 527        const char *name;
 528#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 529        char *devname = "ttyS";
 530#else
 531        char *devname = "ttyPZ";
 532#endif
 533
 534        pr_debug(" -> check_pmac_serial_console()\n");
 535
 536        /* The user has requested a console so this is already set up. */
 537        if (strstr(boot_command_line, "console=")) {
 538                pr_debug(" console was specified !\n");
 539                return -EBUSY;
 540        }
 541
 542        if (!of_chosen) {
 543                pr_debug(" of_chosen is NULL !\n");
 544                return -ENODEV;
 545        }
 546
 547        /* We are getting a weird phandle from OF ... */
 548        /* ... So use the full path instead */
 549        name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 550        if (name == NULL) {
 551                pr_debug(" no linux,stdout-path !\n");
 552                return -ENODEV;
 553        }
 554        prom_stdout = of_find_node_by_path(name);
 555        if (!prom_stdout) {
 556                pr_debug(" can't find stdout package %s !\n", name);
 557                return -ENODEV;
 558        }
 559        pr_debug("stdout is %pOF\n", prom_stdout);
 560
 561        name = of_get_property(prom_stdout, "name", NULL);
 562        if (!name) {
 563                pr_debug(" stdout package has no name !\n");
 564                goto not_found;
 565        }
 566
 567        if (strcmp(name, "ch-a") == 0)
 568                offset = 0;
 569        else if (strcmp(name, "ch-b") == 0)
 570                offset = 1;
 571        else
 572                goto not_found;
 573        of_node_put(prom_stdout);
 574
 575        pr_debug("Found serial console at %s%d\n", devname, offset);
 576
 577        return add_preferred_console(devname, offset, NULL);
 578
 579 not_found:
 580        pr_debug("No preferred console found !\n");
 581        of_node_put(prom_stdout);
 582        return -ENODEV;
 583}
 584console_initcall(check_pmac_serial_console);
 585
 586#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 587
 588/*
 589 * Called very early, MMU is off, device-tree isn't unflattened
 590 */
 591static int __init pmac_probe(void)
 592{
 593        if (!of_machine_is_compatible("Power Macintosh") &&
 594            !of_machine_is_compatible("MacRISC"))
 595                return 0;
 596
 597#ifdef CONFIG_PPC32
 598        /* isa_io_base gets set in pmac_pci_init */
 599        ISA_DMA_THRESHOLD = ~0L;
 600        DMA_MODE_READ = 1;
 601        DMA_MODE_WRITE = 2;
 602#endif /* CONFIG_PPC32 */
 603
 604        pm_power_off = pmac_power_off;
 605
 606        pmac_init();
 607
 608        return 1;
 609}
 610
 611define_machine(powermac) {
 612        .name                   = "PowerMac",
 613        .probe                  = pmac_probe,
 614        .setup_arch             = pmac_setup_arch,
 615        .show_cpuinfo           = pmac_show_cpuinfo,
 616        .init_IRQ               = pmac_pic_init,
 617        .get_irq                = NULL, /* changed later */
 618        .pci_irq_fixup          = pmac_pci_irq_fixup,
 619        .restart                = pmac_restart,
 620        .halt                   = pmac_halt,
 621        .time_init              = pmac_time_init,
 622        .get_boot_time          = pmac_get_boot_time,
 623        .set_rtc_time           = pmac_set_rtc_time,
 624        .get_rtc_time           = pmac_get_rtc_time,
 625        .calibrate_decr         = pmac_calibrate_decr,
 626        .feature_call           = pmac_do_feature_call,
 627        .progress               = udbg_progress,
 628#ifdef CONFIG_PPC64
 629        .power_save             = power4_idle,
 630        .enable_pmcs            = power4_enable_pmcs,
 631#endif /* CONFIG_PPC64 */
 632#ifdef CONFIG_PPC32
 633        .pcibios_after_init     = pmac_pcibios_after_init,
 634        .phys_mem_access_prot   = pci_phys_mem_access_prot,
 635#endif
 636};
 637