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/pgtable.h> 55 #include <asm/io.h> 56 #include <asm/pci-bridge.h> 57 #include <asm/ohare.h> 58 #include <asm/mediabay.h> 59 #include <asm/machdep.h> 60 #include <asm/dma.h> 61 #include <asm/cputable.h> 62 #include <asm/btext.h> 63 #include <asm/pmac_feature.h> 64 #include <asm/time.h> 65 #include <asm/mmu_context.h> 66 #include <asm/iommu.h> 67 #include <asm/smu.h> 68 #include <asm/pmc.h> 69 #include <asm/udbg.h> 70 71 #include "pmac.h" 72 73 #undef SHOW_GATWICK_IRQS 74 75 int ppc_override_l2cr = 0; 76 int ppc_override_l2cr_value; 77 int has_l2cache = 0; 78 79 int pmac_newworld; 80 81 static int current_root_goodness = -1; 82 83 extern struct machdep_calls pmac_md; 84 85 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */ 86 87 #ifdef CONFIG_PPC64 88 int sccdbg; 89 #endif 90 91 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN; 92 EXPORT_SYMBOL(sys_ctrler); 93 94 static void pmac_show_cpuinfo(struct seq_file *m) 95 { 96 struct device_node *np; 97 const char *pp; 98 int plen; 99 int mbmodel; 100 unsigned int mbflags; 101 char* mbname; 102 103 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, 104 PMAC_MB_INFO_MODEL, 0); 105 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, 106 PMAC_MB_INFO_FLAGS, 0); 107 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME, 108 (long) &mbname) != 0) 109 mbname = "Unknown"; 110 111 /* find motherboard type */ 112 seq_printf(m, "machine\t\t: "); 113 np = of_find_node_by_path("/"); 114 if (np != NULL) { 115 pp = of_get_property(np, "model", NULL); 116 if (pp != NULL) 117 seq_printf(m, "%s\n", pp); 118 else 119 seq_printf(m, "PowerMac\n"); 120 pp = of_get_property(np, "compatible", &plen); 121 if (pp != NULL) { 122 seq_printf(m, "motherboard\t:"); 123 while (plen > 0) { 124 int l = strlen(pp) + 1; 125 seq_printf(m, " %s", pp); 126 plen -= l; 127 pp += l; 128 } 129 seq_printf(m, "\n"); 130 } 131 of_node_put(np); 132 } else 133 seq_printf(m, "PowerMac\n"); 134 135 /* print parsed model */ 136 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname); 137 seq_printf(m, "pmac flags\t: %08x\n", mbflags); 138 139 /* find l2 cache info */ 140 np = of_find_node_by_name(NULL, "l2-cache"); 141 if (np == NULL) 142 np = of_find_node_by_type(NULL, "cache"); 143 if (np != NULL) { 144 const unsigned int *ic = 145 of_get_property(np, "i-cache-size", NULL); 146 const unsigned int *dc = 147 of_get_property(np, "d-cache-size", NULL); 148 seq_printf(m, "L2 cache\t:"); 149 has_l2cache = 1; 150 if (of_get_property(np, "cache-unified", NULL) && dc) { 151 seq_printf(m, " %dK unified", *dc / 1024); 152 } else { 153 if (ic) 154 seq_printf(m, " %dK instruction", *ic / 1024); 155 if (dc) 156 seq_printf(m, "%s %dK data", 157 (ic? " +": ""), *dc / 1024); 158 } 159 pp = of_get_property(np, "ram-type", NULL); 160 if (pp) 161 seq_printf(m, " %s", pp); 162 seq_printf(m, "\n"); 163 of_node_put(np); 164 } 165 166 /* Indicate newworld/oldworld */ 167 seq_printf(m, "pmac-generation\t: %s\n", 168 pmac_newworld ? "NewWorld" : "OldWorld"); 169 } 170 171 #ifndef CONFIG_ADB_CUDA 172 int find_via_cuda(void) 173 { 174 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda"); 175 176 if (!dn) 177 return 0; 178 of_node_put(dn); 179 printk("WARNING ! Your machine is CUDA-based but your kernel\n"); 180 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n"); 181 return 0; 182 } 183 #endif 184 185 #ifndef CONFIG_ADB_PMU 186 int find_via_pmu(void) 187 { 188 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu"); 189 190 if (!dn) 191 return 0; 192 of_node_put(dn); 193 printk("WARNING ! Your machine is PMU-based but your kernel\n"); 194 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n"); 195 return 0; 196 } 197 #endif 198 199 #ifndef CONFIG_PMAC_SMU 200 int smu_init(void) 201 { 202 /* should check and warn if SMU is present */ 203 return 0; 204 } 205 #endif 206 207 #ifdef CONFIG_PPC32 208 static volatile u32 *sysctrl_regs; 209 210 static void __init ohare_init(void) 211 { 212 struct device_node *dn; 213 214 /* this area has the CPU identification register 215 and some registers used by smp boards */ 216 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000); 217 218 /* 219 * Turn on the L2 cache. 220 * We assume that we have a PSX memory controller iff 221 * we have an ohare I/O controller. 222 */ 223 dn = of_find_node_by_name(NULL, "ohare"); 224 if (dn) { 225 of_node_put(dn); 226 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) { 227 if (sysctrl_regs[4] & 0x10) 228 sysctrl_regs[4] |= 0x04000020; 229 else 230 sysctrl_regs[4] |= 0x04000000; 231 if(has_l2cache) 232 printk(KERN_INFO "Level 2 cache enabled\n"); 233 } 234 } 235 } 236 237 static void __init l2cr_init(void) 238 { 239 /* Checks "l2cr-value" property in the registry */ 240 if (cpu_has_feature(CPU_FTR_L2CR)) { 241 struct device_node *np; 242 243 for_each_of_cpu_node(np) { 244 const unsigned int *l2cr = 245 of_get_property(np, "l2cr-value", NULL); 246 if (l2cr) { 247 ppc_override_l2cr = 1; 248 ppc_override_l2cr_value = *l2cr; 249 _set_L2CR(0); 250 _set_L2CR(ppc_override_l2cr_value); 251 } 252 of_node_put(np); 253 break; 254 } 255 } 256 257 if (ppc_override_l2cr) 258 printk(KERN_INFO "L2CR overridden (0x%x), " 259 "backside cache is %s\n", 260 ppc_override_l2cr_value, 261 (ppc_override_l2cr_value & 0x80000000) 262 ? "enabled" : "disabled"); 263 } 264 #endif 265 266 static void __init pmac_setup_arch(void) 267 { 268 struct device_node *cpu, *ic; 269 const int *fp; 270 unsigned long pvr; 271 272 pvr = PVR_VER(mfspr(SPRN_PVR)); 273 274 /* Set loops_per_jiffy to a half-way reasonable value, 275 for use until calibrate_delay gets called. */ 276 loops_per_jiffy = 50000000 / HZ; 277 278 for_each_of_cpu_node(cpu) { 279 fp = of_get_property(cpu, "clock-frequency", NULL); 280 if (fp != NULL) { 281 if (pvr >= 0x30 && pvr < 0x80) 282 /* PPC970 etc. */ 283 loops_per_jiffy = *fp / (3 * HZ); 284 else if (pvr == 4 || pvr >= 8) 285 /* 604, G3, G4 etc. */ 286 loops_per_jiffy = *fp / HZ; 287 else 288 /* 601, 603, etc. */ 289 loops_per_jiffy = *fp / (2 * HZ); 290 of_node_put(cpu); 291 break; 292 } 293 } 294 295 /* See if newworld or oldworld */ 296 ic = of_find_node_with_property(NULL, "interrupt-controller"); 297 if (ic) { 298 pmac_newworld = 1; 299 of_node_put(ic); 300 } 301 302 /* Lookup PCI hosts */ 303 pmac_pci_init(); 304 305 #ifdef CONFIG_PPC32 306 ohare_init(); 307 l2cr_init(); 308 #endif /* CONFIG_PPC32 */ 309 310 find_via_cuda(); 311 find_via_pmu(); 312 smu_init(); 313 314 #if IS_ENABLED(CONFIG_NVRAM) 315 pmac_nvram_init(); 316 #endif 317 #ifdef CONFIG_PPC32 318 #ifdef CONFIG_BLK_DEV_INITRD 319 if (initrd_start) 320 ROOT_DEV = Root_RAM0; 321 else 322 #endif 323 ROOT_DEV = DEFAULT_ROOT_DEVICE; 324 #endif 325 326 #ifdef CONFIG_ADB 327 if (strstr(boot_command_line, "adb_sync")) { 328 extern int __adb_probe_sync; 329 __adb_probe_sync = 1; 330 } 331 #endif /* CONFIG_ADB */ 332 } 333 334 #ifdef CONFIG_SCSI 335 void note_scsi_host(struct device_node *node, void *host) 336 { 337 } 338 EXPORT_SYMBOL(note_scsi_host); 339 #endif 340 341 static int initializing = 1; 342 343 static int pmac_late_init(void) 344 { 345 initializing = 0; 346 return 0; 347 } 348 machine_late_initcall(powermac, pmac_late_init); 349 350 void note_bootable_part(dev_t dev, int part, int goodness); 351 /* 352 * This is __ref because we check for "initializing" before 353 * touching any of the __init sensitive things and "initializing" 354 * will be false after __init time. This can't be __init because it 355 * can be called whenever a disk is first accessed. 356 */ 357 void __ref note_bootable_part(dev_t dev, int part, int goodness) 358 { 359 char *p; 360 361 if (!initializing) 362 return; 363 if ((goodness <= current_root_goodness) && 364 ROOT_DEV != DEFAULT_ROOT_DEVICE) 365 return; 366 p = strstr(boot_command_line, "root="); 367 if (p != NULL && (p == boot_command_line || p[-1] == ' ')) 368 return; 369 370 ROOT_DEV = dev + part; 371 current_root_goodness = goodness; 372 } 373 374 #ifdef CONFIG_ADB_CUDA 375 static void __noreturn cuda_restart(void) 376 { 377 struct adb_request req; 378 379 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM); 380 for (;;) 381 cuda_poll(); 382 } 383 384 static void __noreturn cuda_shutdown(void) 385 { 386 struct adb_request req; 387 388 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN); 389 for (;;) 390 cuda_poll(); 391 } 392 393 #else 394 #define cuda_restart() 395 #define cuda_shutdown() 396 #endif 397 398 #ifndef CONFIG_ADB_PMU 399 #define pmu_restart() 400 #define pmu_shutdown() 401 #endif 402 403 #ifndef CONFIG_PMAC_SMU 404 #define smu_restart() 405 #define smu_shutdown() 406 #endif 407 408 static void __noreturn pmac_restart(char *cmd) 409 { 410 switch (sys_ctrler) { 411 case SYS_CTRLER_CUDA: 412 cuda_restart(); 413 break; 414 case SYS_CTRLER_PMU: 415 pmu_restart(); 416 break; 417 case SYS_CTRLER_SMU: 418 smu_restart(); 419 break; 420 default: ; 421 } 422 while (1) ; 423 } 424 425 static void __noreturn pmac_power_off(void) 426 { 427 switch (sys_ctrler) { 428 case SYS_CTRLER_CUDA: 429 cuda_shutdown(); 430 break; 431 case SYS_CTRLER_PMU: 432 pmu_shutdown(); 433 break; 434 case SYS_CTRLER_SMU: 435 smu_shutdown(); 436 break; 437 default: ; 438 } 439 while (1) ; 440 } 441 442 static void __noreturn 443 pmac_halt(void) 444 { 445 pmac_power_off(); 446 } 447 448 /* 449 * Early initialization. 450 */ 451 static void __init pmac_init(void) 452 { 453 /* Enable early btext debug if requested */ 454 if (strstr(boot_command_line, "btextdbg")) { 455 udbg_adb_init_early(); 456 register_early_udbg_console(); 457 } 458 459 /* Probe motherboard chipset */ 460 pmac_feature_init(); 461 462 /* Initialize debug stuff */ 463 udbg_scc_init(!!strstr(boot_command_line, "sccdbg")); 464 udbg_adb_init(!!strstr(boot_command_line, "btextdbg")); 465 466 #ifdef CONFIG_PPC64 467 iommu_init_early_dart(&pmac_pci_controller_ops); 468 #endif 469 470 /* SMP Init has to be done early as we need to patch up 471 * cpu_possible_mask before interrupt stacks are allocated 472 * or kaboom... 473 */ 474 #ifdef CONFIG_SMP 475 pmac_setup_smp(); 476 #endif 477 } 478 479 static int __init pmac_declare_of_platform_devices(void) 480 { 481 struct device_node *np; 482 483 np = of_find_node_by_name(NULL, "valkyrie"); 484 if (np) { 485 of_platform_device_create(np, "valkyrie", NULL); 486 of_node_put(np); 487 } 488 np = of_find_node_by_name(NULL, "platinum"); 489 if (np) { 490 of_platform_device_create(np, "platinum", NULL); 491 of_node_put(np); 492 } 493 np = of_find_node_by_type(NULL, "smu"); 494 if (np) { 495 of_platform_device_create(np, "smu", NULL); 496 of_node_put(np); 497 } 498 np = of_find_node_by_type(NULL, "fcu"); 499 if (np == NULL) { 500 /* Some machines have strangely broken device-tree */ 501 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e"); 502 } 503 if (np) { 504 of_platform_device_create(np, "temperature", NULL); 505 of_node_put(np); 506 } 507 508 return 0; 509 } 510 machine_device_initcall(powermac, pmac_declare_of_platform_devices); 511 512 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE 513 /* 514 * This is called very early, as part of console_init() (typically just after 515 * time_init()). This function is respondible for trying to find a good 516 * default console on serial ports. It tries to match the open firmware 517 * default output with one of the available serial console drivers. 518 */ 519 static int __init check_pmac_serial_console(void) 520 { 521 struct device_node *prom_stdout = NULL; 522 int offset = 0; 523 const char *name; 524 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS 525 char *devname = "ttyS"; 526 #else 527 char *devname = "ttyPZ"; 528 #endif 529 530 pr_debug(" -> check_pmac_serial_console()\n"); 531 532 /* The user has requested a console so this is already set up. */ 533 if (strstr(boot_command_line, "console=")) { 534 pr_debug(" console was specified !\n"); 535 return -EBUSY; 536 } 537 538 if (!of_chosen) { 539 pr_debug(" of_chosen is NULL !\n"); 540 return -ENODEV; 541 } 542 543 /* We are getting a weird phandle from OF ... */ 544 /* ... So use the full path instead */ 545 name = of_get_property(of_chosen, "linux,stdout-path", NULL); 546 if (name == NULL) { 547 pr_debug(" no linux,stdout-path !\n"); 548 return -ENODEV; 549 } 550 prom_stdout = of_find_node_by_path(name); 551 if (!prom_stdout) { 552 pr_debug(" can't find stdout package %s !\n", name); 553 return -ENODEV; 554 } 555 pr_debug("stdout is %pOF\n", prom_stdout); 556 557 if (of_node_name_eq(prom_stdout, "ch-a")) 558 offset = 0; 559 else if (of_node_name_eq(prom_stdout, "ch-b")) 560 offset = 1; 561 else 562 goto not_found; 563 of_node_put(prom_stdout); 564 565 pr_debug("Found serial console at %s%d\n", devname, offset); 566 567 return add_preferred_console(devname, offset, NULL); 568 569 not_found: 570 pr_debug("No preferred console found !\n"); 571 of_node_put(prom_stdout); 572 return -ENODEV; 573 } 574 console_initcall(check_pmac_serial_console); 575 576 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */ 577 578 /* 579 * Called very early, MMU is off, device-tree isn't unflattened 580 */ 581 static int __init pmac_probe(void) 582 { 583 if (!of_machine_is_compatible("Power Macintosh") && 584 !of_machine_is_compatible("MacRISC")) 585 return 0; 586 587 #ifdef CONFIG_PPC32 588 /* isa_io_base gets set in pmac_pci_init */ 589 ISA_DMA_THRESHOLD = ~0L; 590 DMA_MODE_READ = 1; 591 DMA_MODE_WRITE = 2; 592 #endif /* CONFIG_PPC32 */ 593 594 pm_power_off = pmac_power_off; 595 596 pmac_init(); 597 598 return 1; 599 } 600 601 define_machine(powermac) { 602 .name = "PowerMac", 603 .probe = pmac_probe, 604 .setup_arch = pmac_setup_arch, 605 .show_cpuinfo = pmac_show_cpuinfo, 606 .init_IRQ = pmac_pic_init, 607 .get_irq = NULL, /* changed later */ 608 .pci_irq_fixup = pmac_pci_irq_fixup, 609 .restart = pmac_restart, 610 .halt = pmac_halt, 611 .time_init = pmac_time_init, 612 .get_boot_time = pmac_get_boot_time, 613 .set_rtc_time = pmac_set_rtc_time, 614 .get_rtc_time = pmac_get_rtc_time, 615 .calibrate_decr = pmac_calibrate_decr, 616 .feature_call = pmac_do_feature_call, 617 .progress = udbg_progress, 618 #ifdef CONFIG_PPC64 619 .power_save = power4_idle, 620 .enable_pmcs = power4_enable_pmcs, 621 #endif /* CONFIG_PPC64 */ 622 #ifdef CONFIG_PPC32 623 .pcibios_after_init = pmac_pcibios_after_init, 624 .phys_mem_access_prot = pci_phys_mem_access_prot, 625 #endif 626 }; 627