arch/powerpc/platforms/powermac/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Powermac setup and early boot code plus other random bits.
   4  *
   5  *  PowerPC version
   6  *    Copyright (C) 1995-1996 Gary Thomas ([email protected])
   7  *
   8  *  Adapted for Power Macintosh by Paul Mackerras
   9  *    Copyright (C) 1996 Paul Mackerras ([email protected])
  10  *
  11  *  Derived from "arch/alpha/kernel/setup.c"
  12  *    Copyright (C) 1995 Linus Torvalds
  13  *
  14  *  Maintained by Benjamin Herrenschmidt ([email protected])
  15  */
  16
  17 /*
  18  * bootup setup stuff..
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/errno.h>
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/stddef.h>
  27 #include <linux/unistd.h>
  28 #include <linux/ptrace.h>
  29 #include <linux/export.h>
  30 #include <linux/user.h>
  31 #include <linux/tty.h>
  32 #include <linux/string.h>
  33 #include <linux/delay.h>
  34 #include <linux/ioport.h>
  35 #include <linux/major.h>
  36 #include <linux/initrd.h>
  37 #include <linux/vt_kern.h>
  38 #include <linux/console.h>
  39 #include <linux/pci.h>
  40 #include <linux/adb.h>
  41 #include <linux/cuda.h>
  42 #include <linux/pmu.h>
  43 #include <linux/irq.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/root_dev.h>
  46 #include <linux/bitops.h>
  47 #include <linux/suspend.h>
  48 #include <linux/of_device.h>
  49 #include <linux/of_platform.h>
  50
  51 #include <asm/reg.h>
  52 #include <asm/sections.h>
  53 #include <asm/prom.h>
  54 #include <asm/io.h>
  55 #include <asm/pci-bridge.h>
  56 #include <asm/ohare.h>
  57 #include <asm/mediabay.h>
  58 #include <asm/machdep.h>
  59 #include <asm/dma.h>
  60 #include <asm/cputable.h>
  61 #include <asm/btext.h>
  62 #include <asm/pmac_feature.h>
  63 #include <asm/time.h>
  64 #include <asm/mmu_context.h>
  65 #include <asm/iommu.h>
  66 #include <asm/smu.h>
  67 #include <asm/pmc.h>
  68 #include <asm/udbg.h>
  69
  70 #include "pmac.h"
  71
  72 #undef SHOW_GATWICK_IRQS
  73
  74 int ppc_override_l2cr = 0;
  75 int ppc_override_l2cr_value;
  76 int has_l2cache = 0;
  77
  78 int pmac_newworld;
  79
  80 static int current_root_goodness = -1;
  81
  82 extern struct machdep_calls pmac_md;
  83
  84 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  85
  86 #ifdef CONFIG_PPC64
  87 int sccdbg;
  88 #endif
  89
  90 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  91 EXPORT_SYMBOL(sys_ctrler);
  92
  93 static void pmac_show_cpuinfo(struct seq_file *m)
  94 {
  95         struct device_node *np;
  96         const char *pp;
  97         int plen;
  98         int mbmodel;
  99         unsigned int mbflags;
 100         char* mbname;
 101
 102         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 103                                     PMAC_MB_INFO_MODEL, 0);
 104         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 105                                     PMAC_MB_INFO_FLAGS, 0);
 106         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 107                               (long) &mbname) != 0)
 108                 mbname = "Unknown";
 109
 110         /* find motherboard type */
 111         seq_printf(m, "machine\t\t: ");
 112         np = of_find_node_by_path("/");
 113         if (np != NULL) {
 114                 pp = of_get_property(np, "model", NULL);
 115                 if (pp != NULL)
 116                         seq_printf(m, "%s\n", pp);
 117                 else
 118                         seq_printf(m, "PowerMac\n");
 119                 pp = of_get_property(np, "compatible", &plen);
 120                 if (pp != NULL) {
 121                         seq_printf(m, "motherboard\t:");
 122                         while (plen > 0) {
 123                                 int l = strlen(pp) + 1;
 124                                 seq_printf(m, " %s", pp);
 125                                 plen -= l;
 126                                 pp += l;
 127                         }
 128                         seq_printf(m, "\n");
 129                 }
 130                 of_node_put(np);
 131         } else
 132                 seq_printf(m, "PowerMac\n");
 133
 134         /* print parsed model */
 135         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 136         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 137
 138         /* find l2 cache info */
 139         np = of_find_node_by_name(NULL, "l2-cache");
 140         if (np == NULL)
 141                 np = of_find_node_by_type(NULL, "cache");
 142         if (np != NULL) {
 143                 const unsigned int *ic =
 144                         of_get_property(np, "i-cache-size", NULL);
 145                 const unsigned int *dc =
 146                         of_get_property(np, "d-cache-size", NULL);
 147                 seq_printf(m, "L2 cache\t:");
 148                 has_l2cache = 1;
 149                 if (of_get_property(np, "cache-unified", NULL) && dc) {
 150                         seq_printf(m, " %dK unified", *dc / 1024);
 151                 } else {
 152                         if (ic)
 153                                 seq_printf(m, " %dK instruction", *ic / 1024);
 154                         if (dc)
 155                                 seq_printf(m, "%s %dK data",
 156                                            (ic? " +": ""), *dc / 1024);
 157                 }
 158                 pp = of_get_property(np, "ram-type", NULL);
 159                 if (pp)
 160                         seq_printf(m, " %s", pp);
 161                 seq_printf(m, "\n");
 162                 of_node_put(np);
 163         }
 164
 165         /* Indicate newworld/oldworld */
 166         seq_printf(m, "pmac-generation\t: %s\n",
 167                    pmac_newworld ? "NewWorld" : "OldWorld");
 168 }
 169
 170 #ifndef CONFIG_ADB_CUDA
 171 int find_via_cuda(void)
 172 {
 173         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 174
 175         if (!dn)
 176                 return 0;
 177         of_node_put(dn);
 178         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 179         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 180         return 0;
 181 }
 182 #endif
 183
 184 #ifndef CONFIG_ADB_PMU
 185 int find_via_pmu(void)
 186 {
 187         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 188
 189         if (!dn)
 190                 return 0;
 191         of_node_put(dn);
 192         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 193         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 194         return 0;
 195 }
 196 #endif
 197
 198 #ifndef CONFIG_PMAC_SMU
 199 int smu_init(void)
 200 {
 201         /* should check and warn if SMU is present */
 202         return 0;
 203 }
 204 #endif
 205
 206 #ifdef CONFIG_PPC32
 207 static volatile u32 *sysctrl_regs;
 208
 209 static void __init ohare_init(void)
 210 {
 211         struct device_node *dn;
 212
 213         /* this area has the CPU identification register
 214            and some registers used by smp boards */
 215         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 216
 217         /*
 218          * Turn on the L2 cache.
 219          * We assume that we have a PSX memory controller iff
 220          * we have an ohare I/O controller.
 221          */
 222         dn = of_find_node_by_name(NULL, "ohare");
 223         if (dn) {
 224                 of_node_put(dn);
 225                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 226                         if (sysctrl_regs[4] & 0x10)
 227                                 sysctrl_regs[4] |= 0x04000020;
 228                         else
 229                                 sysctrl_regs[4] |= 0x04000000;
 230                         if(has_l2cache)
 231                                 printk(KERN_INFO "Level 2 cache enabled\n");
 232                 }
 233         }
 234 }
 235
 236 static void __init l2cr_init(void)
 237 {
 238         /* Checks "l2cr-value" property in the registry */
 239         if (cpu_has_feature(CPU_FTR_L2CR)) {
 240                 struct device_node *np;
 241
 242                 for_each_of_cpu_node(np) {
 243                         const unsigned int *l2cr =
 244                                 of_get_property(np, "l2cr-value", NULL);
 245                         if (l2cr) {
 246                                 ppc_override_l2cr = 1;
 247                                 ppc_override_l2cr_value = *l2cr;
 248                                 _set_L2CR(0);
 249                                 _set_L2CR(ppc_override_l2cr_value);
 250                         }
 251                         of_node_put(np);
 252                         break;
 253                 }
 254         }
 255
 256         if (ppc_override_l2cr)
 257                 printk(KERN_INFO "L2CR overridden (0x%x), "
 258                        "backside cache is %s\n",
 259                        ppc_override_l2cr_value,
 260                        (ppc_override_l2cr_value & 0x80000000)
 261                                 ? "enabled" : "disabled");
 262 }
 263 #endif
 264
 265 static void __init pmac_setup_arch(void)
 266 {
 267         struct device_node *cpu, *ic;
 268         const int *fp;
 269         unsigned long pvr;
 270
 271         pvr = PVR_VER(mfspr(SPRN_PVR));
 272
 273         /* Set loops_per_jiffy to a half-way reasonable value,
 274            for use until calibrate_delay gets called. */
 275         loops_per_jiffy = 50000000 / HZ;
 276
 277         for_each_of_cpu_node(cpu) {
 278                 fp = of_get_property(cpu, "clock-frequency", NULL);
 279                 if (fp != NULL) {
 280                         if (pvr >= 0x30 && pvr < 0x80)
 281                                 /* PPC970 etc. */
 282                                 loops_per_jiffy = *fp / (3 * HZ);
 283                         else if (pvr == 4 || pvr >= 8)
 284                                 /* 604, G3, G4 etc. */
 285                                 loops_per_jiffy = *fp / HZ;
 286                         else
 287                                 /* 603, etc. */
 288                                 loops_per_jiffy = *fp / (2 * HZ);
 289                         of_node_put(cpu);
 290                         break;
 291                 }
 292         }
 293
 294         /* See if newworld or oldworld */
 295         ic = of_find_node_with_property(NULL, "interrupt-controller");
 296         if (ic) {
 297                 pmac_newworld = 1;
 298                 of_node_put(ic);
 299         }
 300
 301 #ifdef CONFIG_PPC32
 302         ohare_init();
 303         l2cr_init();
 304 #endif /* CONFIG_PPC32 */
 305
 306         find_via_cuda();
 307         find_via_pmu();
 308         smu_init();
 309
 310 #if IS_ENABLED(CONFIG_NVRAM)
 311         pmac_nvram_init();
 312 #endif
 313 #ifdef CONFIG_PPC32
 314 #ifdef CONFIG_BLK_DEV_INITRD
 315         if (initrd_start)
 316                 ROOT_DEV = Root_RAM0;
 317         else
 318 #endif
 319                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 320 #endif
 321
 322 #ifdef CONFIG_ADB
 323         if (strstr(boot_command_line, "adb_sync")) {
 324                 extern int __adb_probe_sync;
 325                 __adb_probe_sync = 1;
 326         }
 327 #endif /* CONFIG_ADB */
 328 }
 329
 330 #ifdef CONFIG_SCSI
 331 void note_scsi_host(struct device_node *node, void *host)
 332 {
 333 }
 334 EXPORT_SYMBOL(note_scsi_host);
 335 #endif
 336
 337 static int initializing = 1;
 338
 339 static int pmac_late_init(void)
 340 {
 341         initializing = 0;
 342         return 0;
 343 }
 344 machine_late_initcall(powermac, pmac_late_init);
 345
 346 void note_bootable_part(dev_t dev, int part, int goodness);
 347 /*
 348  * This is __ref because we check for "initializing" before
 349  * touching any of the __init sensitive things and "initializing"
 350  * will be false after __init time. This can't be __init because it
 351  * can be called whenever a disk is first accessed.
 352  */
 353 void __ref note_bootable_part(dev_t dev, int part, int goodness)
 354 {
 355         char *p;
 356
 357         if (!initializing)
 358                 return;
 359         if ((goodness <= current_root_goodness) &&
 360             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 361                 return;
 362         p = strstr(boot_command_line, "root=");
 363         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 364                 return;
 365
 366         ROOT_DEV = dev + part;
 367         current_root_goodness = goodness;
 368 }
 369
 370 #ifdef CONFIG_ADB_CUDA
 371 static void __noreturn cuda_restart(void)
 372 {
 373         struct adb_request req;
 374
 375         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 376         for (;;)
 377                 cuda_poll();
 378 }
 379
 380 static void __noreturn cuda_shutdown(void)
 381 {
 382         struct adb_request req;
 383
 384         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 385         for (;;)
 386                 cuda_poll();
 387 }
 388
 389 #else
 390 #define cuda_restart()
 391 #define cuda_shutdown()
 392 #endif
 393
 394 #ifndef CONFIG_ADB_PMU
 395 #define pmu_restart()
 396 #define pmu_shutdown()
 397 #endif
 398
 399 #ifndef CONFIG_PMAC_SMU
 400 #define smu_restart()
 401 #define smu_shutdown()
 402 #endif
 403
 404 static void __noreturn pmac_restart(char *cmd)
 405 {
 406         switch (sys_ctrler) {
 407         case SYS_CTRLER_CUDA:
 408                 cuda_restart();
 409                 break;
 410         case SYS_CTRLER_PMU:
 411                 pmu_restart();
 412                 break;
 413         case SYS_CTRLER_SMU:
 414                 smu_restart();
 415                 break;
 416         default: ;
 417         }
 418         while (1) ;
 419 }
 420
 421 static void __noreturn pmac_power_off(void)
 422 {
 423         switch (sys_ctrler) {
 424         case SYS_CTRLER_CUDA:
 425                 cuda_shutdown();
 426                 break;
 427         case SYS_CTRLER_PMU:
 428                 pmu_shutdown();
 429                 break;
 430         case SYS_CTRLER_SMU:
 431                 smu_shutdown();
 432                 break;
 433         default: ;
 434         }
 435         while (1) ;
 436 }
 437
 438 static void __noreturn
 439 pmac_halt(void)
 440 {
 441         pmac_power_off();
 442 }
 443
 444 /*
 445  * Early initialization.
 446  */
 447 static void __init pmac_init(void)
 448 {
 449         /* Enable early btext debug if requested */
 450         if (strstr(boot_command_line, "btextdbg")) {
 451                 udbg_adb_init_early();
 452                 register_early_udbg_console();
 453         }
 454
 455         /* Probe motherboard chipset */
 456         pmac_feature_init();
 457
 458         /* Initialize debug stuff */
 459         udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 460         udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 461
 462 #ifdef CONFIG_PPC64
 463         iommu_init_early_dart(&pmac_pci_controller_ops);
 464 #endif
 465
 466         /* SMP Init has to be done early as we need to patch up
 467          * cpu_possible_mask before interrupt stacks are allocated
 468          * or kaboom...
 469          */
 470 #ifdef CONFIG_SMP
 471         pmac_setup_smp();
 472 #endif
 473 }
 474
 475 static int __init pmac_declare_of_platform_devices(void)
 476 {
 477         struct device_node *np;
 478
 479         np = of_find_node_by_name(NULL, "valkyrie");
 480         if (np) {
 481                 of_platform_device_create(np, "valkyrie", NULL);
 482                 of_node_put(np);
 483         }
 484         np = of_find_node_by_name(NULL, "platinum");
 485         if (np) {
 486                 of_platform_device_create(np, "platinum", NULL);
 487                 of_node_put(np);
 488         }
 489         np = of_find_node_by_type(NULL, "smu");
 490         if (np) {
 491                 of_platform_device_create(np, "smu", NULL);
 492                 of_node_put(np);
 493         }
 494         np = of_find_node_by_type(NULL, "fcu");
 495         if (np == NULL) {
 496                 /* Some machines have strangely broken device-tree */
 497                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 498         }
 499         if (np) {
 500                 of_platform_device_create(np, "temperature", NULL);
 501                 of_node_put(np);
 502         }
 503
 504         return 0;
 505 }
 506 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 507
 508 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 509 /*
 510  * This is called very early, as part of console_init() (typically just after
 511  * time_init()). This function is respondible for trying to find a good
 512  * default console on serial ports. It tries to match the open firmware
 513  * default output with one of the available serial console drivers.
 514  */
 515 static int __init check_pmac_serial_console(void)
 516 {
 517         struct device_node *prom_stdout = NULL;
 518         int offset = 0;
 519         const char *name;
 520 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 521         char *devname = "ttyS";
 522 #else
 523         char *devname = "ttyPZ";
 524 #endif
 525
 526         pr_debug(" -> check_pmac_serial_console()\n");
 527
 528         /* The user has requested a console so this is already set up. */
 529         if (strstr(boot_command_line, "console=")) {
 530                 pr_debug(" console was specified !\n");
 531                 return -EBUSY;
 532         }
 533
 534         if (!of_chosen) {
 535                 pr_debug(" of_chosen is NULL !\n");
 536                 return -ENODEV;
 537         }
 538
 539         /* We are getting a weird phandle from OF ... */
 540         /* ... So use the full path instead */
 541         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 542         if (name == NULL) {
 543                 pr_debug(" no linux,stdout-path !\n");
 544                 return -ENODEV;
 545         }
 546         prom_stdout = of_find_node_by_path(name);
 547         if (!prom_stdout) {
 548                 pr_debug(" can't find stdout package %s !\n", name);
 549                 return -ENODEV;
 550         }
 551         pr_debug("stdout is %pOF\n", prom_stdout);
 552
 553         if (of_node_name_eq(prom_stdout, "ch-a"))
 554                 offset = 0;
 555         else if (of_node_name_eq(prom_stdout, "ch-b"))
 556                 offset = 1;
 557         else
 558                 goto not_found;
 559         of_node_put(prom_stdout);
 560
 561         pr_debug("Found serial console at %s%d\n", devname, offset);
 562
 563         return add_preferred_console(devname, offset, NULL);
 564
 565  not_found:
 566         pr_debug("No preferred console found !\n");
 567         of_node_put(prom_stdout);
 568         return -ENODEV;
 569 }
 570 console_initcall(check_pmac_serial_console);
 571
 572 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 573
 574 /*
 575  * Called very early, MMU is off, device-tree isn't unflattened
 576  */
 577 static int __init pmac_probe(void)
 578 {
 579         if (!of_machine_is_compatible("Power Macintosh") &&
 580             !of_machine_is_compatible("MacRISC"))
 581                 return 0;
 582
 583 #ifdef CONFIG_PPC32
 584         /* isa_io_base gets set in pmac_pci_init */
 585         DMA_MODE_READ = 1;
 586         DMA_MODE_WRITE = 2;
 587 #endif /* CONFIG_PPC32 */
 588
 589         pm_power_off = pmac_power_off;
 590
 591         pmac_init();
 592
 593         return 1;
 594 }
 595
 596 define_machine(powermac) {
 597         .name                   = "PowerMac",
 598         .probe                  = pmac_probe,
 599         .setup_arch             = pmac_setup_arch,
 600         .discover_phbs          = pmac_pci_init,
 601         .show_cpuinfo           = pmac_show_cpuinfo,
 602         .init_IRQ               = pmac_pic_init,
 603         .get_irq                = NULL, /* changed later */
 604         .pci_irq_fixup          = pmac_pci_irq_fixup,
 605         .restart                = pmac_restart,
 606         .halt                   = pmac_halt,
 607         .time_init              = pmac_time_init,
 608         .get_boot_time          = pmac_get_boot_time,
 609         .set_rtc_time           = pmac_set_rtc_time,
 610         .get_rtc_time           = pmac_get_rtc_time,
 611         .calibrate_decr         = pmac_calibrate_decr,
 612         .feature_call           = pmac_do_feature_call,
 613         .progress               = udbg_progress,
 614 #ifdef CONFIG_PPC64
 615         .power_save             = power4_idle,
 616         .enable_pmcs            = power4_enable_pmcs,
 617 #endif /* CONFIG_PPC64 */
 618 #ifdef CONFIG_PPC32
 619         .pcibios_after_init     = pmac_pcibios_after_init,
 620         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 621 #endif
 622 };