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   1 /*
   2  *  arch/ppc/platforms/setup.c
   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@cs.anu.edu.au)
   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/config.h>
  27 #include <linux/init.h>
  28 #include <linux/errno.h>
  29 #include <linux/sched.h>
  30 #include <linux/kernel.h>
  31 #include <linux/mm.h>
  32 #include <linux/stddef.h>
  33 #include <linux/unistd.h>
  34 #include <linux/ptrace.h>
  35 #include <linux/slab.h>
  36 #include <linux/user.h>
  37 #include <linux/a.out.h>
  38 #include <linux/tty.h>
  39 #include <linux/string.h>
  40 #include <linux/delay.h>
  41 #include <linux/ioport.h>
  42 #include <linux/major.h>
  43 #include <linux/initrd.h>
  44 #include <linux/vt_kern.h>
  45 #include <linux/console.h>
  46 #include <linux/ide.h>
  47 #include <linux/pci.h>
  48 #include <linux/adb.h>
  49 #include <linux/cuda.h>
  50 #include <linux/pmu.h>
  51 #include <linux/irq.h>
  52 #include <linux/seq_file.h>
  53 #include <linux/root_dev.h>
  54 #include <linux/bitops.h>
  55 #include <linux/suspend.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/bootx.h>
  69 #include <asm/cputable.h>
  70 #include <asm/btext.h>
  71 #include <asm/pmac_feature.h>
  72 #include <asm/time.h>
  73 #include <asm/of_device.h>
  74 #include <asm/mmu_context.h>
  75
  76 #include "pmac.h"
  77
  78 #undef SHOW_GATWICK_IRQS
  79
  80 unsigned char drive_info;
  81
  82 int ppc_override_l2cr = 0;
  83 int ppc_override_l2cr_value;
  84 int has_l2cache = 0;
  85
  86 int pmac_newworld = 1;
  87
  88 static int current_root_goodness = -1;
  89
  90 extern int pmac_newworld;
  91
  92 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  93
  94 extern void zs_kgdb_hook(int tty_num);
  95 static void ohare_init(void);
  96 #ifdef CONFIG_BOOTX_TEXT
  97 static void pmac_progress(char *s, unsigned short hex);
  98 #endif
  99
 100 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
 101
 102 #ifdef CONFIG_SMP
 103 extern struct smp_ops_t psurge_smp_ops;
 104 extern struct smp_ops_t core99_smp_ops;
 105 #endif /* CONFIG_SMP */
 106
 107 static void pmac_show_cpuinfo(struct seq_file *m)
 108 {
 109         struct device_node *np;
 110         char *pp;
 111         int plen;
 112         int mbmodel;
 113         unsigned int mbflags;
 114         char* mbname;
 115
 116         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 117                                     PMAC_MB_INFO_MODEL, 0);
 118         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 119                                     PMAC_MB_INFO_FLAGS, 0);
 120         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 121                               (long) &mbname) != 0)
 122                 mbname = "Unknown";
 123
 124         /* find motherboard type */
 125         seq_printf(m, "machine\t\t: ");
 126         np = of_find_node_by_path("/");
 127         if (np != NULL) {
 128                 pp = (char *) get_property(np, "model", NULL);
 129                 if (pp != NULL)
 130                         seq_printf(m, "%s\n", pp);
 131                 else
 132                         seq_printf(m, "PowerMac\n");
 133                 pp = (char *) get_property(np, "compatible", &plen);
 134                 if (pp != NULL) {
 135                         seq_printf(m, "motherboard\t:");
 136                         while (plen > 0) {
 137                                 int l = strlen(pp) + 1;
 138                                 seq_printf(m, " %s", pp);
 139                                 plen -= l;
 140                                 pp += l;
 141                         }
 142                         seq_printf(m, "\n");
 143                 }
 144                 of_node_put(np);
 145         } else
 146                 seq_printf(m, "PowerMac\n");
 147
 148         /* print parsed model */
 149         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 150         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 151
 152         /* find l2 cache info */
 153         np = of_find_node_by_name(NULL, "l2-cache");
 154         if (np == NULL)
 155                 np = of_find_node_by_type(NULL, "cache");
 156         if (np != NULL) {
 157                 unsigned int *ic = (unsigned int *)
 158                         get_property(np, "i-cache-size", NULL);
 159                 unsigned int *dc = (unsigned int *)
 160                         get_property(np, "d-cache-size", NULL);
 161                 seq_printf(m, "L2 cache\t:");
 162                 has_l2cache = 1;
 163                 if (get_property(np, "cache-unified", NULL) != 0 && dc) {
 164                         seq_printf(m, " %dK unified", *dc / 1024);
 165                 } else {
 166                         if (ic)
 167                                 seq_printf(m, " %dK instruction", *ic / 1024);
 168                         if (dc)
 169                                 seq_printf(m, "%s %dK data",
 170                                            (ic? " +": ""), *dc / 1024);
 171                 }
 172                 pp = get_property(np, "ram-type", NULL);
 173                 if (pp)
 174                         seq_printf(m, " %s", pp);
 175                 seq_printf(m, "\n");
 176                 of_node_put(np);
 177         }
 178
 179         /* Indicate newworld/oldworld */
 180         seq_printf(m, "pmac-generation\t: %s\n",
 181                    pmac_newworld ? "NewWorld" : "OldWorld");
 182 }
 183
 184 static void pmac_show_percpuinfo(struct seq_file *m, int i)
 185 {
 186 #ifdef CONFIG_CPU_FREQ_PMAC
 187         extern unsigned int pmac_get_one_cpufreq(int i);
 188         unsigned int freq = pmac_get_one_cpufreq(i);
 189         if (freq != 0) {
 190                 seq_printf(m, "clock\t\t: %dMHz\n", freq/1000);
 191                 return;
 192         }
 193 #endif /* CONFIG_CPU_FREQ_PMAC */
 194         of_show_percpuinfo(m, i);
 195 }
 196
 197 static volatile u32 *sysctrl_regs;
 198
 199 void __init
 200 pmac_setup_arch(void)
 201 {
 202         struct device_node *cpu;
 203         int *fp;
 204         unsigned long pvr;
 205
 206         pvr = PVR_VER(mfspr(SPRN_PVR));
 207
 208         /* Set loops_per_jiffy to a half-way reasonable value,
 209            for use until calibrate_delay gets called. */
 210         cpu = find_type_devices("cpu");
 211         if (cpu != 0) {
 212                 fp = (int *) get_property(cpu, "clock-frequency", NULL);
 213                 if (fp != 0) {
 214                         if (pvr == 4 || pvr >= 8)
 215                                 /* 604, G3, G4 etc. */
 216                                 loops_per_jiffy = *fp / HZ;
 217                         else
 218                                 /* 601, 603, etc. */
 219                                 loops_per_jiffy = *fp / (2*HZ);
 220                 } else
 221                         loops_per_jiffy = 50000000 / HZ;
 222         }
 223
 224         /* this area has the CPU identification register
 225            and some registers used by smp boards */
 226         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 227         ohare_init();
 228
 229         /* Lookup PCI hosts */
 230         pmac_find_bridges();
 231
 232         /* Checks "l2cr-value" property in the registry */
 233         if (cpu_has_feature(CPU_FTR_L2CR)) {
 234                 struct device_node *np = find_devices("cpus");
 235                 if (np == 0)
 236                         np = find_type_devices("cpu");
 237                 if (np != 0) {
 238                         unsigned int *l2cr = (unsigned int *)
 239                                 get_property(np, "l2cr-value", NULL);
 240                         if (l2cr != 0) {
 241                                 ppc_override_l2cr = 1;
 242                                 ppc_override_l2cr_value = *l2cr;
 243                                 _set_L2CR(0);
 244                                 _set_L2CR(ppc_override_l2cr_value);
 245                         }
 246                 }
 247         }
 248
 249         if (ppc_override_l2cr)
 250                 printk(KERN_INFO "L2CR overriden (0x%x), backside cache is %s\n",
 251                         ppc_override_l2cr_value, (ppc_override_l2cr_value & 0x80000000)
 252                                 ? "enabled" : "disabled");
 253
 254 #ifdef CONFIG_KGDB
 255         zs_kgdb_hook(0);
 256 #endif
 257
 258 #ifdef CONFIG_ADB_CUDA
 259         find_via_cuda();
 260 #else
 261         if (find_devices("via-cuda")) {
 262                 printk("WARNING ! Your machine is Cuda based but your kernel\n");
 263                 printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 264         }
 265 #endif
 266 #ifdef CONFIG_ADB_PMU
 267         find_via_pmu();
 268 #else
 269         if (find_devices("via-pmu")) {
 270                 printk("WARNING ! Your machine is PMU based but your kernel\n");
 271                 printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 272         }
 273 #endif
 274 #ifdef CONFIG_NVRAM
 275         pmac_nvram_init();
 276 #endif
 277 #ifdef CONFIG_BLK_DEV_INITRD
 278         if (initrd_start)
 279                 ROOT_DEV = Root_RAM0;
 280         else
 281 #endif
 282                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 283
 284 #ifdef CONFIG_SMP
 285         /* Check for Core99 */
 286         if (find_devices("uni-n") || find_devices("u3"))
 287                 smp_ops = &core99_smp_ops;
 288         else
 289                 smp_ops = &psurge_smp_ops;
 290 #endif /* CONFIG_SMP */
 291
 292         pci_create_OF_bus_map();
 293 }
 294
 295 static void __init ohare_init(void)
 296 {
 297         /*
 298          * Turn on the L2 cache.
 299          * We assume that we have a PSX memory controller iff
 300          * we have an ohare I/O controller.
 301          */
 302         if (find_devices("ohare") != NULL) {
 303                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 304                         if (sysctrl_regs[4] & 0x10)
 305                                 sysctrl_regs[4] |= 0x04000020;
 306                         else
 307                                 sysctrl_regs[4] |= 0x04000000;
 308                         if(has_l2cache)
 309                                 printk(KERN_INFO "Level 2 cache enabled\n");
 310                 }
 311         }
 312 }
 313
 314 char *bootpath;
 315 char *bootdevice;
 316 void *boot_host;
 317 int boot_target;
 318 int boot_part;
 319 extern dev_t boot_dev;
 320
 321 #ifdef CONFIG_SCSI
 322 void __init
 323 note_scsi_host(struct device_node *node, void *host)
 324 {
 325         int l;
 326         char *p;
 327
 328         l = strlen(node->full_name);
 329         if (bootpath != NULL && bootdevice != NULL
 330             && strncmp(node->full_name, bootdevice, l) == 0
 331             && (bootdevice[l] == '/' || bootdevice[l] == 0)) {
 332                 boot_host = host;
 333                 /*
 334                  * There's a bug in OF 1.0.5.  (Why am I not surprised.)
 335                  * If you pass a path like scsi/sd@1:0 to canon, it returns
 336                  * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
 337                  * That is, the scsi target number doesn't get preserved.
 338                  * So we pick the target number out of bootpath and use that.
 339                  */
 340                 p = strstr(bootpath, "/sd@");
 341                 if (p != NULL) {
 342                         p += 4;
 343                         boot_target = simple_strtoul(p, NULL, 10);
 344                         p = strchr(p, ':');
 345                         if (p != NULL)
 346                                 boot_part = simple_strtoul(p + 1, NULL, 10);
 347                 }
 348         }
 349 }
 350 EXPORT_SYMBOL(note_scsi_host);
 351 #endif
 352
 353 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 354 static dev_t __init
 355 find_ide_boot(void)
 356 {
 357         char *p;
 358         int n;
 359         dev_t __init pmac_find_ide_boot(char *bootdevice, int n);
 360
 361         if (bootdevice == NULL)
 362                 return 0;
 363         p = strrchr(bootdevice, '/');
 364         if (p == NULL)
 365                 return 0;
 366         n = p - bootdevice;
 367
 368         return pmac_find_ide_boot(bootdevice, n);
 369 }
 370 #endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */
 371
 372 static void __init
 373 find_boot_device(void)
 374 {
 375 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
 376         boot_dev = find_ide_boot();
 377 #endif
 378 }
 379
 380 static int initializing = 1;
 381 /* TODO: Merge the suspend-to-ram with the common code !!!
 382  * currently, this is a stub implementation for suspend-to-disk
 383  * only
 384  */
 385
 386 #ifdef CONFIG_SOFTWARE_SUSPEND
 387
 388 static int pmac_pm_prepare(suspend_state_t state)
 389 {
 390         printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);
 391
 392         return 0;
 393 }
 394
 395 static int pmac_pm_enter(suspend_state_t state)
 396 {
 397         printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);
 398
 399         /* Giveup the lazy FPU & vec so we don't have to back them
 400          * up from the low level code
 401          */
 402         enable_kernel_fp();
 403
 404 #ifdef CONFIG_ALTIVEC
 405         if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
 406                 enable_kernel_altivec();
 407 #endif /* CONFIG_ALTIVEC */
 408
 409         return 0;
 410 }
 411
 412 static int pmac_pm_finish(suspend_state_t state)
 413 {
 414         printk(KERN_DEBUG "%s(%d)\n", __FUNCTION__, state);
 415
 416         /* Restore userland MMU context */
 417         set_context(current->active_mm->context, current->active_mm->pgd);
 418
 419         return 0;
 420 }
 421
 422 static struct pm_ops pmac_pm_ops = {
 423         .pm_disk_mode   = PM_DISK_SHUTDOWN,
 424         .prepare        = pmac_pm_prepare,
 425         .enter          = pmac_pm_enter,
 426         .finish         = pmac_pm_finish,
 427 };
 428
 429 #endif /* CONFIG_SOFTWARE_SUSPEND */
 430
 431 static int pmac_late_init(void)
 432 {
 433         initializing = 0;
 434 #ifdef CONFIG_SOFTWARE_SUSPEND
 435         pm_set_ops(&pmac_pm_ops);
 436 #endif /* CONFIG_SOFTWARE_SUSPEND */
 437         return 0;
 438 }
 439
 440 late_initcall(pmac_late_init);
 441
 442 /* can't be __init - can be called whenever a disk is first accessed */
 443 void
 444 note_bootable_part(dev_t dev, int part, int goodness)
 445 {
 446         static int found_boot = 0;
 447         char *p;
 448
 449         if (!initializing)
 450                 return;
 451         if ((goodness <= current_root_goodness) &&
 452             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 453                 return;
 454         p = strstr(saved_command_line, "root=");
 455         if (p != NULL && (p == saved_command_line || p[-1] == ' '))
 456                 return;
 457
 458         if (!found_boot) {
 459                 find_boot_device();
 460                 found_boot = 1;
 461         }
 462         if (!boot_dev || dev == boot_dev) {
 463                 ROOT_DEV = dev + part;
 464                 boot_dev = 0;
 465                 current_root_goodness = goodness;
 466         }
 467 }
 468
 469 static void
 470 pmac_restart(char *cmd)
 471 {
 472 #ifdef CONFIG_ADB_CUDA
 473         struct adb_request req;
 474 #endif /* CONFIG_ADB_CUDA */
 475
 476         switch (sys_ctrler) {
 477 #ifdef CONFIG_ADB_CUDA
 478         case SYS_CTRLER_CUDA:
 479                 cuda_request(&req, NULL, 2, CUDA_PACKET,
 480                              CUDA_RESET_SYSTEM);
 481                 for (;;)
 482                         cuda_poll();
 483                 break;
 484 #endif /* CONFIG_ADB_CUDA */
 485 #ifdef CONFIG_ADB_PMU
 486         case SYS_CTRLER_PMU:
 487                 pmu_restart();
 488                 break;
 489 #endif /* CONFIG_ADB_PMU */
 490         default: ;
 491         }
 492 }
 493
 494 static void
 495 pmac_power_off(void)
 496 {
 497 #ifdef CONFIG_ADB_CUDA
 498         struct adb_request req;
 499 #endif /* CONFIG_ADB_CUDA */
 500
 501         switch (sys_ctrler) {
 502 #ifdef CONFIG_ADB_CUDA
 503         case SYS_CTRLER_CUDA:
 504                 cuda_request(&req, NULL, 2, CUDA_PACKET,
 505                              CUDA_POWERDOWN);
 506                 for (;;)
 507                         cuda_poll();
 508                 break;
 509 #endif /* CONFIG_ADB_CUDA */
 510 #ifdef CONFIG_ADB_PMU
 511         case SYS_CTRLER_PMU:
 512                 pmu_shutdown();
 513                 break;
 514 #endif /* CONFIG_ADB_PMU */
 515         default: ;
 516         }
 517 }
 518
 519 static void
 520 pmac_halt(void)
 521 {
 522         pmac_power_off();
 523 }
 524
 525 void __init pmac_init(void)
 526 {
 527         /* isa_io_base gets set in pmac_find_bridges */
 528         isa_mem_base = PMAC_ISA_MEM_BASE;
 529         pci_dram_offset = PMAC_PCI_DRAM_OFFSET;
 530         ISA_DMA_THRESHOLD = ~0L;
 531         DMA_MODE_READ = 1;
 532         DMA_MODE_WRITE = 2;
 533
 534         ppc_md.setup_arch     = pmac_setup_arch;
 535         ppc_md.show_cpuinfo   = pmac_show_cpuinfo;
 536         ppc_md.show_percpuinfo = pmac_show_percpuinfo;
 537         ppc_md.init_IRQ       = pmac_pic_init;
 538         ppc_md.get_irq        = pmac_get_irq; /* Changed later on ... */
 539
 540         ppc_md.pcibios_fixup  = pmac_pcibios_fixup;
 541         ppc_md.pcibios_enable_device_hook = pmac_pci_enable_device_hook;
 542         ppc_md.pcibios_after_init = pmac_pcibios_after_init;
 543         ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
 544
 545         ppc_md.restart        = pmac_restart;
 546         ppc_md.power_off      = pmac_power_off;
 547         ppc_md.halt           = pmac_halt;
 548
 549         ppc_md.time_init      = pmac_time_init;
 550         ppc_md.set_rtc_time   = pmac_set_rtc_time;
 551         ppc_md.get_rtc_time   = pmac_get_rtc_time;
 552         ppc_md.get_boot_time  = pmac_get_boot_time;
 553         ppc_md.calibrate_decr = pmac_calibrate_decr;
 554
 555         ppc_md.feature_call   = pmac_do_feature_call;
 556
 557 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
 558 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 559         ppc_ide_md.ide_init_hwif        = pmac_ide_init_hwif_ports;
 560         ppc_ide_md.default_io_base      = pmac_ide_get_base;
 561 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 562 #endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */
 563
 564 #ifdef CONFIG_BOOTX_TEXT
 565         ppc_md.progress = pmac_progress;
 566 #endif /* CONFIG_BOOTX_TEXT */
 567
 568         if (ppc_md.progress) ppc_md.progress("pmac_init(): exit", 0);
 569
 570 }
 571
 572 #ifdef CONFIG_BOOTX_TEXT
 573 static void __init
 574 pmac_progress(char *s, unsigned short hex)
 575 {
 576         if (boot_text_mapped) {
 577                 btext_drawstring(s);
 578                 btext_drawchar('\n');
 579         }
 580 }
 581 #endif /* CONFIG_BOOTX_TEXT */
 582
 583 static int __init
 584 pmac_declare_of_platform_devices(void)
 585 {
 586         struct device_node *np;
 587
 588         np = find_devices("uni-n");
 589         if (np) {
 590                 for (np = np->child; np != NULL; np = np->sibling)
 591                         if (strncmp(np->name, "i2c", 3) == 0) {
 592                                 of_platform_device_create(np, "uni-n-i2c",
 593                                                           NULL);
 594                                 break;
 595                         }
 596         }
 597         np = find_devices("u3");
 598         if (np) {
 599                 for (np = np->child; np != NULL; np = np->sibling)
 600                         if (strncmp(np->name, "i2c", 3) == 0) {
 601                                 of_platform_device_create(np, "u3-i2c",
 602                                                           NULL);
 603                                 break;
 604                         }
 605         }
 606
 607         np = find_devices("valkyrie");
 608         if (np)
 609                 of_platform_device_create(np, "valkyrie", NULL);
 610         np = find_devices("platinum");
 611         if (np)
 612                 of_platform_device_create(np, "platinum", NULL);
 613
 614         return 0;
 615 }
 616
 617 device_initcall(pmac_declare_of_platform_devices);