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.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 /* sda1 - slightly silly choice */
  80 #define DEFAULT_ROOT_DEVICE     MKDEV(SCSI_DISK0_MAJOR, 1)
  81
  82 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
  83 EXPORT_SYMBOL(sys_ctrler);
  84
  85 static void pmac_show_cpuinfo(struct seq_file *m)
  86 {
  87         struct device_node *np;
  88         const char *pp;
  89         int plen;
  90         int mbmodel;
  91         unsigned int mbflags;
  92         char* mbname;
  93
  94         mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
  95                                     PMAC_MB_INFO_MODEL, 0);
  96         mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
  97                                     PMAC_MB_INFO_FLAGS, 0);
  98         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
  99                               (long) &mbname) != 0)
 100                 mbname = "Unknown";
 101
 102         /* find motherboard type */
 103         seq_printf(m, "machine\t\t: ");
 104         np = of_find_node_by_path("/");
 105         if (np != NULL) {
 106                 pp = of_get_property(np, "model", NULL);
 107                 if (pp != NULL)
 108                         seq_printf(m, "%s\n", pp);
 109                 else
 110                         seq_printf(m, "PowerMac\n");
 111                 pp = of_get_property(np, "compatible", &plen);
 112                 if (pp != NULL) {
 113                         seq_printf(m, "motherboard\t:");
 114                         while (plen > 0) {
 115                                 int l = strlen(pp) + 1;
 116                                 seq_printf(m, " %s", pp);
 117                                 plen -= l;
 118                                 pp += l;
 119                         }
 120                         seq_printf(m, "\n");
 121                 }
 122                 of_node_put(np);
 123         } else
 124                 seq_printf(m, "PowerMac\n");
 125
 126         /* print parsed model */
 127         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 128         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 129
 130         /* find l2 cache info */
 131         np = of_find_node_by_name(NULL, "l2-cache");
 132         if (np == NULL)
 133                 np = of_find_node_by_type(NULL, "cache");
 134         if (np != NULL) {
 135                 const unsigned int *ic =
 136                         of_get_property(np, "i-cache-size", NULL);
 137                 const unsigned int *dc =
 138                         of_get_property(np, "d-cache-size", NULL);
 139                 seq_printf(m, "L2 cache\t:");
 140                 has_l2cache = 1;
 141                 if (of_property_read_bool(np, "cache-unified") && dc) {
 142                         seq_printf(m, " %dK unified", *dc / 1024);
 143                 } else {
 144                         if (ic)
 145                                 seq_printf(m, " %dK instruction", *ic / 1024);
 146                         if (dc)
 147                                 seq_printf(m, "%s %dK data",
 148                                            (ic? " +": ""), *dc / 1024);
 149                 }
 150                 pp = of_get_property(np, "ram-type", NULL);
 151                 if (pp)
 152                         seq_printf(m, " %s", pp);
 153                 seq_printf(m, "\n");
 154                 of_node_put(np);
 155         }
 156
 157         /* Indicate newworld/oldworld */
 158         seq_printf(m, "pmac-generation\t: %s\n",
 159                    pmac_newworld ? "NewWorld" : "OldWorld");
 160 }
 161
 162 #ifndef CONFIG_ADB_CUDA
 163 int __init find_via_cuda(void)
 164 {
 165         struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
 166
 167         if (!dn)
 168                 return 0;
 169         of_node_put(dn);
 170         printk("WARNING ! Your machine is CUDA-based but your kernel\n");
 171         printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
 172         return 0;
 173 }
 174 #endif
 175
 176 #ifndef CONFIG_ADB_PMU
 177 int __init find_via_pmu(void)
 178 {
 179         struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
 180
 181         if (!dn)
 182                 return 0;
 183         of_node_put(dn);
 184         printk("WARNING ! Your machine is PMU-based but your kernel\n");
 185         printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
 186         return 0;
 187 }
 188 #endif
 189
 190 #ifndef CONFIG_PMAC_SMU
 191 int __init smu_init(void)
 192 {
 193         /* should check and warn if SMU is present */
 194         return 0;
 195 }
 196 #endif
 197
 198 #ifdef CONFIG_PPC32
 199 static volatile u32 *sysctrl_regs;
 200
 201 static void __init ohare_init(void)
 202 {
 203         struct device_node *dn;
 204
 205         /* this area has the CPU identification register
 206            and some registers used by smp boards */
 207         sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
 208
 209         /*
 210          * Turn on the L2 cache.
 211          * We assume that we have a PSX memory controller iff
 212          * we have an ohare I/O controller.
 213          */
 214         dn = of_find_node_by_name(NULL, "ohare");
 215         if (dn) {
 216                 of_node_put(dn);
 217                 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
 218                         if (sysctrl_regs[4] & 0x10)
 219                                 sysctrl_regs[4] |= 0x04000020;
 220                         else
 221                                 sysctrl_regs[4] |= 0x04000000;
 222                         if(has_l2cache)
 223                                 printk(KERN_INFO "Level 2 cache enabled\n");
 224                 }
 225         }
 226 }
 227
 228 static void __init l2cr_init(void)
 229 {
 230         /* Checks "l2cr-value" property in the registry */
 231         if (cpu_has_feature(CPU_FTR_L2CR)) {
 232                 struct device_node *np;
 233
 234                 for_each_of_cpu_node(np) {
 235                         const unsigned int *l2cr =
 236                                 of_get_property(np, "l2cr-value", NULL);
 237                         if (l2cr) {
 238                                 _set_L2CR(0);
 239                                 _set_L2CR(*l2cr);
 240                                 pr_info("L2CR overridden (0x%x), backside cache is %s\n",
 241                                         *l2cr, ((*l2cr) & 0x80000000) ?
 242                                         "enabled" : "disabled");
 243                         }
 244                         of_node_put(np);
 245                         break;
 246                 }
 247         }
 248 }
 249 #endif
 250
 251 static void __init pmac_setup_arch(void)
 252 {
 253         struct device_node *cpu, *ic;
 254         const int *fp;
 255         unsigned long pvr;
 256
 257         pvr = PVR_VER(mfspr(SPRN_PVR));
 258
 259         /* Set loops_per_jiffy to a half-way reasonable value,
 260            for use until calibrate_delay gets called. */
 261         loops_per_jiffy = 50000000 / HZ;
 262
 263         for_each_of_cpu_node(cpu) {
 264                 fp = of_get_property(cpu, "clock-frequency", NULL);
 265                 if (fp != NULL) {
 266                         if (pvr >= 0x30 && pvr < 0x80)
 267                                 /* PPC970 etc. */
 268                                 loops_per_jiffy = *fp / (3 * HZ);
 269                         else if (pvr == 4 || pvr >= 8)
 270                                 /* 604, G3, G4 etc. */
 271                                 loops_per_jiffy = *fp / HZ;
 272                         else
 273                                 /* 603, etc. */
 274                                 loops_per_jiffy = *fp / (2 * HZ);
 275                         of_node_put(cpu);
 276                         break;
 277                 }
 278         }
 279
 280         /* See if newworld or oldworld */
 281         ic = of_find_node_with_property(NULL, "interrupt-controller");
 282         if (ic) {
 283                 pmac_newworld = 1;
 284                 of_node_put(ic);
 285         }
 286
 287 #ifdef CONFIG_PPC32
 288         ohare_init();
 289         l2cr_init();
 290 #endif /* CONFIG_PPC32 */
 291
 292         find_via_cuda();
 293         find_via_pmu();
 294         smu_init();
 295
 296 #if IS_ENABLED(CONFIG_NVRAM)
 297         pmac_nvram_init();
 298 #endif
 299 #ifdef CONFIG_PPC32
 300 #ifdef CONFIG_BLK_DEV_INITRD
 301         if (initrd_start)
 302                 ROOT_DEV = Root_RAM0;
 303         else
 304 #endif
 305                 ROOT_DEV = DEFAULT_ROOT_DEVICE;
 306 #endif
 307
 308 #ifdef CONFIG_ADB
 309         if (strstr(boot_command_line, "adb_sync")) {
 310                 extern int __adb_probe_sync;
 311                 __adb_probe_sync = 1;
 312         }
 313 #endif /* CONFIG_ADB */
 314 }
 315
 316 static int initializing = 1;
 317
 318 static int pmac_late_init(void)
 319 {
 320         initializing = 0;
 321         return 0;
 322 }
 323 machine_late_initcall(powermac, pmac_late_init);
 324
 325 void note_bootable_part(dev_t dev, int part, int goodness);
 326 /*
 327  * This is __ref because we check for "initializing" before
 328  * touching any of the __init sensitive things and "initializing"
 329  * will be false after __init time. This can't be __init because it
 330  * can be called whenever a disk is first accessed.
 331  */
 332 void __ref note_bootable_part(dev_t dev, int part, int goodness)
 333 {
 334         char *p;
 335
 336         if (!initializing)
 337                 return;
 338         if ((goodness <= current_root_goodness) &&
 339             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 340                 return;
 341         p = strstr(boot_command_line, "root=");
 342         if (p != NULL && (p == boot_command_line || p[-1] == ' '))
 343                 return;
 344
 345         ROOT_DEV = dev + part;
 346         current_root_goodness = goodness;
 347 }
 348
 349 #ifdef CONFIG_ADB_CUDA
 350 static void __noreturn cuda_restart(void)
 351 {
 352         struct adb_request req;
 353
 354         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
 355         for (;;)
 356                 cuda_poll();
 357 }
 358
 359 static void __noreturn cuda_shutdown(void)
 360 {
 361         struct adb_request req;
 362
 363         cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
 364         for (;;)
 365                 cuda_poll();
 366 }
 367
 368 #else
 369 #define cuda_restart()
 370 #define cuda_shutdown()
 371 #endif
 372
 373 #ifndef CONFIG_ADB_PMU
 374 #define pmu_restart()
 375 #define pmu_shutdown()
 376 #endif
 377
 378 #ifndef CONFIG_PMAC_SMU
 379 #define smu_restart()
 380 #define smu_shutdown()
 381 #endif
 382
 383 static void __noreturn pmac_restart(char *cmd)
 384 {
 385         switch (sys_ctrler) {
 386         case SYS_CTRLER_CUDA:
 387                 cuda_restart();
 388                 break;
 389         case SYS_CTRLER_PMU:
 390                 pmu_restart();
 391                 break;
 392         case SYS_CTRLER_SMU:
 393                 smu_restart();
 394                 break;
 395         default: ;
 396         }
 397         while (1) ;
 398 }
 399
 400 static void __noreturn pmac_power_off(void)
 401 {
 402         switch (sys_ctrler) {
 403         case SYS_CTRLER_CUDA:
 404                 cuda_shutdown();
 405                 break;
 406         case SYS_CTRLER_PMU:
 407                 pmu_shutdown();
 408                 break;
 409         case SYS_CTRLER_SMU:
 410                 smu_shutdown();
 411                 break;
 412         default: ;
 413         }
 414         while (1) ;
 415 }
 416
 417 static void __noreturn
 418 pmac_halt(void)
 419 {
 420         pmac_power_off();
 421 }
 422
 423 /*
 424  * Early initialization.
 425  */
 426 static void __init pmac_init(void)
 427 {
 428         /* Enable early btext debug if requested */
 429         if (strstr(boot_command_line, "btextdbg")) {
 430                 udbg_adb_init_early();
 431                 register_early_udbg_console();
 432         }
 433
 434         /* Probe motherboard chipset */
 435         pmac_feature_init();
 436
 437         /* Initialize debug stuff */
 438         udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
 439         udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
 440
 441 #ifdef CONFIG_PPC64
 442         iommu_init_early_dart(&pmac_pci_controller_ops);
 443 #endif
 444
 445         /* SMP Init has to be done early as we need to patch up
 446          * cpu_possible_mask before interrupt stacks are allocated
 447          * or kaboom...
 448          */
 449 #ifdef CONFIG_SMP
 450         pmac_setup_smp();
 451 #endif
 452 }
 453
 454 static int __init pmac_declare_of_platform_devices(void)
 455 {
 456         struct device_node *np;
 457
 458         np = of_find_node_by_name(NULL, "valkyrie");
 459         if (np) {
 460                 of_platform_device_create(np, "valkyrie", NULL);
 461                 of_node_put(np);
 462         }
 463         np = of_find_node_by_name(NULL, "platinum");
 464         if (np) {
 465                 of_platform_device_create(np, "platinum", NULL);
 466                 of_node_put(np);
 467         }
 468         np = of_find_node_by_type(NULL, "smu");
 469         if (np) {
 470                 of_platform_device_create(np, "smu", NULL);
 471                 of_node_put(np);
 472         }
 473         np = of_find_node_by_type(NULL, "fcu");
 474         if (np == NULL) {
 475                 /* Some machines have strangely broken device-tree */
 476                 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
 477         }
 478         if (np) {
 479                 of_platform_device_create(np, "temperature", NULL);
 480                 of_node_put(np);
 481         }
 482
 483         return 0;
 484 }
 485 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
 486
 487 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 488 /*
 489  * This is called very early, as part of console_init() (typically just after
 490  * time_init()). This function is respondible for trying to find a good
 491  * default console on serial ports. It tries to match the open firmware
 492  * default output with one of the available serial console drivers.
 493  */
 494 static int __init check_pmac_serial_console(void)
 495 {
 496         struct device_node *prom_stdout = NULL;
 497         int offset = 0;
 498         const char *name;
 499 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 500         char *devname = "ttyS";
 501 #else
 502         char *devname = "ttyPZ";
 503 #endif
 504
 505         pr_debug(" -> check_pmac_serial_console()\n");
 506
 507         /* The user has requested a console so this is already set up. */
 508         if (strstr(boot_command_line, "console=")) {
 509                 pr_debug(" console was specified !\n");
 510                 return -EBUSY;
 511         }
 512
 513         if (!of_chosen) {
 514                 pr_debug(" of_chosen is NULL !\n");
 515                 return -ENODEV;
 516         }
 517
 518         /* We are getting a weird phandle from OF ... */
 519         /* ... So use the full path instead */
 520         name = of_get_property(of_chosen, "linux,stdout-path", NULL);
 521         if (name == NULL) {
 522                 pr_debug(" no linux,stdout-path !\n");
 523                 return -ENODEV;
 524         }
 525         prom_stdout = of_find_node_by_path(name);
 526         if (!prom_stdout) {
 527                 pr_debug(" can't find stdout package %s !\n", name);
 528                 return -ENODEV;
 529         }
 530         pr_debug("stdout is %pOF\n", prom_stdout);
 531
 532         if (of_node_name_eq(prom_stdout, "ch-a"))
 533                 offset = 0;
 534         else if (of_node_name_eq(prom_stdout, "ch-b"))
 535                 offset = 1;
 536         else
 537                 goto not_found;
 538         of_node_put(prom_stdout);
 539
 540         pr_debug("Found serial console at %s%d\n", devname, offset);
 541
 542         return add_preferred_console(devname, offset, NULL);
 543
 544  not_found:
 545         pr_debug("No preferred console found !\n");
 546         of_node_put(prom_stdout);
 547         return -ENODEV;
 548 }
 549 console_initcall(check_pmac_serial_console);
 550
 551 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
 552
 553 /*
 554  * Called very early, MMU is off, device-tree isn't unflattened
 555  */
 556 static int __init pmac_probe(void)
 557 {
 558         if (!of_machine_is_compatible("Power Macintosh") &&
 559             !of_machine_is_compatible("MacRISC"))
 560                 return 0;
 561
 562 #ifdef CONFIG_PPC32
 563         /* isa_io_base gets set in pmac_pci_init */
 564         DMA_MODE_READ = 1;
 565         DMA_MODE_WRITE = 2;
 566 #endif /* CONFIG_PPC32 */
 567
 568         pm_power_off = pmac_power_off;
 569
 570         pmac_init();
 571
 572         return 1;
 573 }
 574
 575 define_machine(powermac) {
 576         .name                   = "PowerMac",
 577         .probe                  = pmac_probe,
 578         .setup_arch             = pmac_setup_arch,
 579         .discover_phbs          = pmac_pci_init,
 580         .show_cpuinfo           = pmac_show_cpuinfo,
 581         .init_IRQ               = pmac_pic_init,
 582         .get_irq                = NULL, /* changed later */
 583         .pci_irq_fixup          = pmac_pci_irq_fixup,
 584         .restart                = pmac_restart,
 585         .halt                   = pmac_halt,
 586         .time_init              = pmac_time_init,
 587         .get_boot_time          = pmac_get_boot_time,
 588         .set_rtc_time           = pmac_set_rtc_time,
 589         .get_rtc_time           = pmac_get_rtc_time,
 590         .calibrate_decr         = pmac_calibrate_decr,
 591         .feature_call           = pmac_do_feature_call,
 592         .progress               = udbg_progress,
 593 #ifdef CONFIG_PPC64
 594         .power_save             = power4_idle,
 595         .enable_pmcs            = power4_enable_pmcs,
 596 #endif /* CONFIG_PPC64 */
 597 #ifdef CONFIG_PPC32
 598         .pcibios_after_init     = pmac_pcibios_after_init,
 599         .phys_mem_access_prot   = pci_phys_mem_access_prot,
 600 #endif
 601 };