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