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 (gdt@linuxppc.org)
   7  *
   8  *  Adapted for Power Macintosh by Paul Mackerras
   9  *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
  10  *
  11  *  Derived from "arch/alpha/kernel/setup.c"
  12  *    Copyright (C) 1995 Linus Torvalds
  13  *
  14  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
  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         /* Lookup PCI hosts */
 302         pmac_pci_init();
 303
 304 #ifdef CONFIG_PPC32
 305         ohare_init();
 306         l2cr_init();
 307 #endif /* CONFIG_PPC32 */
 308
 309         find_via_cuda();
 310         find_via_pmu();
 311         smu_init();
 312
 313 #if IS_ENABLED(CONFIG_NVRAM)
 314         pmac_nvram_init();
 315 #endif
 316 #ifdef CONFIG_PPC32
 317 #ifdef CONFIG_BLK_DEV_INITRD
 318         if (initrd_start)
 319                 ROOT_DEV = Root_RAM0;
 320         else
 321 #endif
 322                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 323 #endif
 324
 325 #ifdef CONFIG_ADB
 326         if (strstr(boot_command_line, "adb_sync")) {
 327                 extern int __adb_probe_sync;
 328                 __adb_probe_sync = 1;
 329         }
 330 #endif /* CONFIG_ADB */
 331 }
 332
 333 #ifdef CONFIG_SCSI
 334 void note_scsi_host(struct device_node *node, void *host)
 335 {
 336 }
 337 EXPORT_SYMBOL(note_scsi_host);
 338 #endif
 339
 340 static int initializing = 1;
 341
 342 static int pmac_late_init(void)
 343 {
 344         initializing = 0;
 345         return 0;
 346 }
 347 machine_late_initcall(powermac, pmac_late_init);
 348
 349 void note_bootable_part(dev_t dev, int part, int goodness);
 350 /*
 351  * This is __ref because we check for "initializing" before
 352  * touching any of the __init sensitive things and "initializing"
 353  * will be false after __init time. This can't be __init because it
 354  * can be called whenever a disk is first accessed.
 355  */
 356 void __ref note_bootable_part(dev_t dev, int part, int goodness)
 357 {
 358         char *p;
 359
 360         if (!initializing)
 361                 return;
 362         if ((goodness <= current_root_goodness) &&
 363             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 364                 return;
 365         p = strstr(boot_command_line, "root=");
 366         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 367                 return;
 368
 369         ROOT_DEV = dev + part;
 370         current_root_goodness = goodness;
 371 }
 372
 373 #ifdef CONFIG_ADB_CUDA
 374 static void __noreturn cuda_restart(void)
 375 {
 376         struct adb_request req;
 377
 378         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 379         for (;;)
 380                 cuda_poll();
 381 }
 382
 383 static void __noreturn cuda_shutdown(void)
 384 {
 385         struct adb_request req;
 386
 387         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 388         for (;;)
 389                 cuda_poll();
 390 }
 391
 392 #else
 393 #define cuda_restart()
 394 #define cuda_shutdown()
 395 #endif
 396
 397 #ifndef CONFIG_ADB_PMU
 398 #define pmu_restart()
 399 #define pmu_shutdown()
 400 #endif
 401
 402 #ifndef CONFIG_PMAC_SMU
 403 #define smu_restart()
 404 #define smu_shutdown()
 405 #endif
 406
 407 static void __noreturn pmac_restart(char *cmd)
 408 {
 409         switch (sys_ctrler) {
 410         case SYS_CTRLER_CUDA:
 411                 cuda_restart();
 412                 break;
 413         case SYS_CTRLER_PMU:
 414                 pmu_restart();
 415                 break;
 416         case SYS_CTRLER_SMU:
 417                 smu_restart();
 418                 break;
 419         default: ;
 420         }
 421         while (1) ;
 422 }
 423
 424 static void __noreturn pmac_power_off(void)
 425 {
 426         switch (sys_ctrler) {
 427         case SYS_CTRLER_CUDA:
 428                 cuda_shutdown();
 429                 break;
 430         case SYS_CTRLER_PMU:
 431                 pmu_shutdown();
 432                 break;
 433         case SYS_CTRLER_SMU:
 434                 smu_shutdown();
 435                 break;
 436         default: ;
 437         }
 438         while (1) ;
 439 }
 440
 441 static void __noreturn
 442 pmac_halt(void)
 443 {
 444         pmac_power_off();
 445 }
 446
 447 /*
 448  * Early initialization.
 449  */
 450 static void __init pmac_init(void)
 451 {
 452         /* Enable early btext debug if requested */
 453         if (strstr(boot_command_line, "btextdbg")) {
 454                 udbg_adb_init_early();
 455                 register_early_udbg_console();
 456         }
 457
 458         /* Probe motherboard chipset */
 459         pmac_feature_init();
 460
 461         /* Initialize debug stuff */
 462         udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 463         udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 464
 465 #ifdef CONFIG_PPC64
 466         iommu_init_early_dart(&pmac_pci_controller_ops);
 467 #endif
 468
 469         /* SMP Init has to be done early as we need to patch up
 470          * cpu_possible_mask before interrupt stacks are allocated
 471          * or kaboom...
 472          */
 473 #ifdef CONFIG_SMP
 474         pmac_setup_smp();
 475 #endif
 476 }
 477
 478 static int __init pmac_declare_of_platform_devices(void)
 479 {
 480         struct device_node *np;
 481
 482         np = of_find_node_by_name(NULL, "valkyrie");
 483         if (np) {
 484                 of_platform_device_create(np, "valkyrie", NULL);
 485                 of_node_put(np);
 486         }
 487         np = of_find_node_by_name(NULL, "platinum");
 488         if (np) {
 489                 of_platform_device_create(np, "platinum", NULL);
 490                 of_node_put(np);
 491         }
 492         np = of_find_node_by_type(NULL, "smu");
 493         if (np) {
 494                 of_platform_device_create(np, "smu", NULL);
 495                 of_node_put(np);
 496         }
 497         np = of_find_node_by_type(NULL, "fcu");
 498         if (np == NULL) {
 499                 /* Some machines have strangely broken device-tree */
 500                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 501         }
 502         if (np) {
 503                 of_platform_device_create(np, "temperature", NULL);
 504                 of_node_put(np);
 505         }
 506
 507         return 0;
 508 }
 509 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 510
 511 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 512 /*
 513  * This is called very early, as part of console_init() (typically just after
 514  * time_init()). This function is respondible for trying to find a good
 515  * default console on serial ports. It tries to match the open firmware
 516  * default output with one of the available serial console drivers.
 517  */
 518 static int __init check_pmac_serial_console(void)
 519 {
 520         struct device_node *prom_stdout = NULL;
 521         int offset = 0;
 522         const char *name;
 523 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 524         char *devname = "ttyS";
 525 #else
 526         char *devname = "ttyPZ";
 527 #endif
 528
 529         pr_debug(" -> check_pmac_serial_console()\n");
 530
 531         /* The user has requested a console so this is already set up. */
 532         if (strstr(boot_command_line, "console=")) {
 533                 pr_debug(" console was specified !\n");
 534                 return -EBUSY;
 535         }
 536
 537         if (!of_chosen) {
 538                 pr_debug(" of_chosen is NULL !\n");
 539                 return -ENODEV;
 540         }
 541
 542         /* We are getting a weird phandle from OF ... */
 543         /* ... So use the full path instead */
 544         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 545         if (name == NULL) {
 546                 pr_debug(" no linux,stdout-path !\n");
 547                 return -ENODEV;
 548         }
 549         prom_stdout = of_find_node_by_path(name);
 550         if (!prom_stdout) {
 551                 pr_debug(" can't find stdout package %s !\n", name);
 552                 return -ENODEV;
 553         }
 554         pr_debug("stdout is %pOF\n", prom_stdout);
 555
 556         if (of_node_name_eq(prom_stdout, "ch-a"))
 557                 offset = 0;
 558         else if (of_node_name_eq(prom_stdout, "ch-b"))
 559                 offset = 1;
 560         else
 561                 goto not_found;
 562         of_node_put(prom_stdout);
 563
 564         pr_debug("Found serial console at %s%d\n", devname, offset);
 565
 566         return add_preferred_console(devname, offset, NULL);
 567
 568  not_found:
 569         pr_debug("No preferred console found !\n");
 570         of_node_put(prom_stdout);
 571         return -ENODEV;
 572 }
 573 console_initcall(check_pmac_serial_console);
 574
 575 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 576
 577 /*
 578  * Called very early, MMU is off, device-tree isn't unflattened
 579  */
 580 static int __init pmac_probe(void)
 581 {
 582         if (!of_machine_is_compatible("Power Macintosh") &&
 583             !of_machine_is_compatible("MacRISC"))
 584                 return 0;
 585
 586 #ifdef CONFIG_PPC32
 587         /* isa_io_base gets set in pmac_pci_init */
 588         DMA_MODE_READ = 1;
 589         DMA_MODE_WRITE = 2;
 590 #endif /* CONFIG_PPC32 */
 591
 592         pm_power_off = pmac_power_off;
 593
 594         pmac_init();
 595
 596         return 1;
 597 }
 598
 599 define_machine(powermac) {
 600         .name                   = "PowerMac",
 601         .probe                  = pmac_probe,
 602         .setup_arch             = pmac_setup_arch,
 603         .show_cpuinfo           = pmac_show_cpuinfo,
 604         .init_IRQ               = pmac_pic_init,
 605         .get_irq                = NULL, /* changed later */
 606         .pci_irq_fixup          = pmac_pci_irq_fixup,
 607         .restart                = pmac_restart,
 608         .halt                   = pmac_halt,
 609         .time_init              = pmac_time_init,
 610         .get_boot_time          = pmac_get_boot_time,
 611         .set_rtc_time           = pmac_set_rtc_time,
 612         .get_rtc_time           = pmac_get_rtc_time,
 613         .calibrate_decr         = pmac_calibrate_decr,
 614         .feature_call           = pmac_do_feature_call,
 615         .progress               = udbg_progress,
 616 #ifdef CONFIG_PPC64
 617         .power_save             = power4_idle,
 618         .enable_pmcs            = power4_enable_pmcs,
 619 #endif /* CONFIG_PPC64 */
 620 #ifdef CONFIG_PPC32
 621         .pcibios_after_init     = pmac_pcibios_after_init,
 622         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 623 #endif
 624 };