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