1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/m68k/kernel/setup.c 4 * 5 * Copyright (C) 1995 Hamish Macdonald 6 */ 7 8 /* 9 * This file handles the architecture-dependent parts of system setup 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/cpu.h> 14 #include <linux/mm.h> 15 #include <linux/sched.h> 16 #include <linux/delay.h> 17 #include <linux/interrupt.h> 18 #include <linux/fs.h> 19 #include <linux/console.h> 20 #include <linux/errno.h> 21 #include <linux/string.h> 22 #include <linux/init.h> 23 #include <linux/memblock.h> 24 #include <linux/proc_fs.h> 25 #include <linux/seq_file.h> 26 #include <linux/module.h> 27 #include <linux/nvram.h> 28 #include <linux/initrd.h> 29 #include <linux/random.h> 30 31 #include <asm/bootinfo.h> 32 #include <asm/byteorder.h> 33 #include <asm/sections.h> 34 #include <asm/setup.h> 35 #include <asm/fpu.h> 36 #include <asm/irq.h> 37 #include <asm/io.h> 38 #include <asm/machdep.h> 39 #ifdef CONFIG_AMIGA 40 #include <asm/amigahw.h> 41 #endif 42 #include <asm/atarihw.h> 43 #ifdef CONFIG_ATARI 44 #include <asm/atari_stram.h> 45 #endif 46 #ifdef CONFIG_SUN3X 47 #include <asm/dvma.h> 48 #endif 49 #include <asm/macintosh.h> 50 #include <asm/natfeat.h> 51 #include <asm/config.h> 52 53 #if !FPSTATESIZE || !NR_IRQS 54 #warning No CPU/platform type selected, your kernel will not work! 55 #warning Are you building an allnoconfig kernel? 56 #endif 57 58 unsigned long m68k_machtype; 59 EXPORT_SYMBOL(m68k_machtype); 60 unsigned long m68k_cputype; 61 EXPORT_SYMBOL(m68k_cputype); 62 unsigned long m68k_fputype; 63 unsigned long m68k_mmutype; 64 EXPORT_SYMBOL(m68k_mmutype); 65 #ifdef CONFIG_VME 66 unsigned long vme_brdtype; 67 EXPORT_SYMBOL(vme_brdtype); 68 #endif 69 70 int m68k_is040or060; 71 EXPORT_SYMBOL(m68k_is040or060); 72 73 extern unsigned long availmem; 74 75 int m68k_num_memory; 76 EXPORT_SYMBOL(m68k_num_memory); 77 int m68k_realnum_memory; 78 EXPORT_SYMBOL(m68k_realnum_memory); 79 unsigned long m68k_memoffset; 80 struct m68k_mem_info m68k_memory[NUM_MEMINFO]; 81 EXPORT_SYMBOL(m68k_memory); 82 83 static struct m68k_mem_info m68k_ramdisk __initdata; 84 85 static char m68k_command_line[CL_SIZE] __initdata; 86 87 void (*mach_sched_init) (void) __initdata = NULL; 88 /* machine dependent irq functions */ 89 void (*mach_init_IRQ) (void) __initdata = NULL; 90 void (*mach_get_model) (char *model); 91 void (*mach_get_hardware_list) (struct seq_file *m); 92 void (*mach_reset)( void ); 93 void (*mach_halt)( void ); 94 #ifdef CONFIG_HEARTBEAT 95 void (*mach_heartbeat) (int); 96 EXPORT_SYMBOL(mach_heartbeat); 97 #endif 98 #ifdef CONFIG_M68K_L2_CACHE 99 void (*mach_l2_flush) (int); 100 #endif 101 #if defined(CONFIG_ISA) && defined(MULTI_ISA) 102 int isa_type; 103 int isa_sex; 104 EXPORT_SYMBOL(isa_type); 105 EXPORT_SYMBOL(isa_sex); 106 #endif 107 108 #define MASK_256K 0xfffc0000 109 110 static void __init m68k_parse_bootinfo(const struct bi_record *record) 111 { 112 const struct bi_record *first_record = record; 113 uint16_t tag; 114 115 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) { 116 int unknown = 0; 117 const void *data = record->data; 118 uint16_t size = be16_to_cpu(record->size); 119 120 switch (tag) { 121 case BI_MACHTYPE: 122 case BI_CPUTYPE: 123 case BI_FPUTYPE: 124 case BI_MMUTYPE: 125 /* Already set up by head.S */ 126 break; 127 128 case BI_MEMCHUNK: 129 if (m68k_num_memory < NUM_MEMINFO) { 130 const struct mem_info *m = data; 131 m68k_memory[m68k_num_memory].addr = 132 be32_to_cpu(m->addr); 133 m68k_memory[m68k_num_memory].size = 134 be32_to_cpu(m->size); 135 m68k_num_memory++; 136 } else 137 pr_warn("%s: too many memory chunks\n", 138 __func__); 139 break; 140 141 case BI_RAMDISK: 142 { 143 const struct mem_info *m = data; 144 m68k_ramdisk.addr = be32_to_cpu(m->addr); 145 m68k_ramdisk.size = be32_to_cpu(m->size); 146 } 147 break; 148 149 case BI_COMMAND_LINE: 150 strscpy(m68k_command_line, data); 151 break; 152 153 case BI_RNG_SEED: { 154 u16 len = be16_to_cpup(data); 155 add_bootloader_randomness(data + 2, len); 156 /* 157 * Zero the data to preserve forward secrecy, and zero the 158 * length to prevent kexec from using it. 159 */ 160 memzero_explicit((void *)data, len + 2); 161 break; 162 } 163 164 default: 165 if (MACH_IS_AMIGA) 166 unknown = amiga_parse_bootinfo(record); 167 else if (MACH_IS_ATARI) 168 unknown = atari_parse_bootinfo(record); 169 else if (MACH_IS_MAC) 170 unknown = mac_parse_bootinfo(record); 171 else if (MACH_IS_Q40) 172 unknown = q40_parse_bootinfo(record); 173 else if (MACH_IS_BVME6000) 174 unknown = bvme6000_parse_bootinfo(record); 175 else if (MACH_IS_MVME16x) 176 unknown = mvme16x_parse_bootinfo(record); 177 else if (MACH_IS_MVME147) 178 unknown = mvme147_parse_bootinfo(record); 179 else if (MACH_IS_HP300) 180 unknown = hp300_parse_bootinfo(record); 181 else if (MACH_IS_APOLLO) 182 unknown = apollo_parse_bootinfo(record); 183 else if (MACH_IS_VIRT) 184 unknown = virt_parse_bootinfo(record); 185 else 186 unknown = 1; 187 } 188 if (unknown) 189 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__, 190 tag); 191 record = (struct bi_record *)((unsigned long)record + size); 192 } 193 194 save_bootinfo(first_record); 195 196 m68k_realnum_memory = m68k_num_memory; 197 #ifdef CONFIG_SINGLE_MEMORY_CHUNK 198 if (m68k_num_memory > 1) { 199 pr_warn("%s: ignoring last %i chunks of physical memory\n", 200 __func__, (m68k_num_memory - 1)); 201 m68k_num_memory = 1; 202 } 203 #endif 204 } 205 206 void __init setup_arch(char **cmdline_p) 207 { 208 /* The bootinfo is located right after the kernel */ 209 if (!CPU_IS_COLDFIRE) 210 m68k_parse_bootinfo((const struct bi_record *)_end); 211 212 if (CPU_IS_040) 213 m68k_is040or060 = 4; 214 else if (CPU_IS_060) 215 m68k_is040or060 = 6; 216 217 /* FIXME: m68k_fputype is passed in by Penguin booter, which can 218 * be confused by software FPU emulation. BEWARE. 219 * We should really do our own FPU check at startup. 220 * [what do we do with buggy 68LC040s? if we have problems 221 * with them, we should add a test to check_bugs() below] */ 222 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY) 223 /* clear the fpu if we have one */ 224 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) { 225 volatile int zero = 0; 226 asm volatile ("frestore %0" : : "m" (zero)); 227 } 228 #endif 229 230 if (CPU_IS_060) { 231 u32 pcr; 232 233 asm (".chip 68060; movec %%pcr,%0; .chip 68k" 234 : "=d" (pcr)); 235 if (((pcr >> 8) & 0xff) <= 5) { 236 pr_warn("Enabling workaround for errata I14\n"); 237 asm (".chip 68060; movec %0,%%pcr; .chip 68k" 238 : : "d" (pcr | 0x20)); 239 } 240 } 241 242 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end); 243 244 #if defined(CONFIG_BOOTPARAM) 245 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE); 246 m68k_command_line[CL_SIZE - 1] = 0; 247 #endif /* CONFIG_BOOTPARAM */ 248 process_uboot_commandline(&m68k_command_line[0], CL_SIZE); 249 *cmdline_p = m68k_command_line; 250 memcpy(boot_command_line, *cmdline_p, CL_SIZE); 251 /* 252 * Initialise the static keys early as they may be enabled by the 253 * cpufeature code and early parameters. 254 */ 255 jump_label_init(); 256 parse_early_param(); 257 258 switch (m68k_machtype) { 259 #ifdef CONFIG_AMIGA 260 case MACH_AMIGA: 261 config_amiga(); 262 break; 263 #endif 264 #ifdef CONFIG_ATARI 265 case MACH_ATARI: 266 config_atari(); 267 break; 268 #endif 269 #ifdef CONFIG_MAC 270 case MACH_MAC: 271 config_mac(); 272 break; 273 #endif 274 #ifdef CONFIG_SUN3 275 case MACH_SUN3: 276 config_sun3(); 277 break; 278 #endif 279 #ifdef CONFIG_APOLLO 280 case MACH_APOLLO: 281 config_apollo(); 282 break; 283 #endif 284 #ifdef CONFIG_MVME147 285 case MACH_MVME147: 286 config_mvme147(); 287 break; 288 #endif 289 #ifdef CONFIG_MVME16x 290 case MACH_MVME16x: 291 config_mvme16x(); 292 break; 293 #endif 294 #ifdef CONFIG_BVME6000 295 case MACH_BVME6000: 296 config_bvme6000(); 297 break; 298 #endif 299 #ifdef CONFIG_HP300 300 case MACH_HP300: 301 config_hp300(); 302 break; 303 #endif 304 #ifdef CONFIG_Q40 305 case MACH_Q40: 306 config_q40(); 307 break; 308 #endif 309 #ifdef CONFIG_SUN3X 310 case MACH_SUN3X: 311 config_sun3x(); 312 break; 313 #endif 314 #ifdef CONFIG_COLDFIRE 315 case MACH_M54XX: 316 case MACH_M5441X: 317 cf_bootmem_alloc(); 318 cf_mmu_context_init(); 319 config_BSP(NULL, 0); 320 break; 321 #endif 322 #ifdef CONFIG_VIRT 323 case MACH_VIRT: 324 config_virt(); 325 break; 326 #endif 327 default: 328 panic("No configuration setup"); 329 } 330 331 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) 332 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size); 333 334 paging_init(); 335 336 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) { 337 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr); 338 initrd_end = initrd_start + m68k_ramdisk.size; 339 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end); 340 } 341 342 #ifdef CONFIG_NATFEAT 343 nf_init(); 344 #endif 345 346 #ifdef CONFIG_ATARI 347 if (MACH_IS_ATARI) 348 atari_stram_reserve_pages((void *)availmem); 349 #endif 350 #ifdef CONFIG_SUN3X 351 if (MACH_IS_SUN3X) { 352 dvma_init(); 353 } 354 #endif 355 356 /* set ISA defs early as possible */ 357 #if defined(CONFIG_ISA) && defined(MULTI_ISA) 358 if (MACH_IS_Q40) { 359 isa_type = ISA_TYPE_Q40; 360 isa_sex = 0; 361 } 362 #ifdef CONFIG_AMIGA_PCMCIA 363 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) { 364 isa_type = ISA_TYPE_AG; 365 isa_sex = 1; 366 } 367 #endif 368 #ifdef CONFIG_ATARI_ROM_ISA 369 if (MACH_IS_ATARI) { 370 isa_type = ISA_TYPE_ENEC; 371 isa_sex = 0; 372 } 373 #endif 374 #endif 375 } 376 377 static int show_cpuinfo(struct seq_file *m, void *v) 378 { 379 const char *cpu, *mmu, *fpu; 380 unsigned long clockfreq, clockfactor; 381 382 #define LOOP_CYCLES_68020 (8) 383 #define LOOP_CYCLES_68030 (8) 384 #define LOOP_CYCLES_68040 (3) 385 #define LOOP_CYCLES_68060 (1) 386 #define LOOP_CYCLES_COLDFIRE (2) 387 388 if (CPU_IS_020) { 389 cpu = "68020"; 390 clockfactor = LOOP_CYCLES_68020; 391 } else if (CPU_IS_030) { 392 cpu = "68030"; 393 clockfactor = LOOP_CYCLES_68030; 394 } else if (CPU_IS_040) { 395 cpu = "68040"; 396 clockfactor = LOOP_CYCLES_68040; 397 } else if (CPU_IS_060) { 398 cpu = "68060"; 399 clockfactor = LOOP_CYCLES_68060; 400 } else if (CPU_IS_COLDFIRE) { 401 cpu = "ColdFire"; 402 clockfactor = LOOP_CYCLES_COLDFIRE; 403 } else { 404 cpu = "680x0"; 405 clockfactor = 0; 406 } 407 408 #ifdef CONFIG_M68KFPU_EMU_ONLY 409 fpu = "none(soft float)"; 410 #else 411 if (m68k_fputype & FPU_68881) 412 fpu = "68881"; 413 else if (m68k_fputype & FPU_68882) 414 fpu = "68882"; 415 else if (m68k_fputype & FPU_68040) 416 fpu = "68040"; 417 else if (m68k_fputype & FPU_68060) 418 fpu = "68060"; 419 else if (m68k_fputype & FPU_SUNFPA) 420 fpu = "Sun FPA"; 421 else if (m68k_fputype & FPU_COLDFIRE) 422 fpu = "ColdFire"; 423 else 424 fpu = "none"; 425 #endif 426 427 if (m68k_mmutype & MMU_68851) 428 mmu = "68851"; 429 else if (m68k_mmutype & MMU_68030) 430 mmu = "68030"; 431 else if (m68k_mmutype & MMU_68040) 432 mmu = "68040"; 433 else if (m68k_mmutype & MMU_68060) 434 mmu = "68060"; 435 else if (m68k_mmutype & MMU_SUN3) 436 mmu = "Sun-3"; 437 else if (m68k_mmutype & MMU_APOLLO) 438 mmu = "Apollo"; 439 else if (m68k_mmutype & MMU_COLDFIRE) 440 mmu = "ColdFire"; 441 else 442 mmu = "unknown"; 443 444 clockfreq = loops_per_jiffy * HZ * clockfactor; 445 446 seq_printf(m, "CPU:\t\t%s\n" 447 "MMU:\t\t%s\n" 448 "FPU:\t\t%s\n" 449 "Clocking:\t%lu.%1luMHz\n" 450 "BogoMips:\t%lu.%02lu\n" 451 "Calibration:\t%lu loops\n", 452 cpu, mmu, fpu, 453 clockfreq/1000000,(clockfreq/100000)%10, 454 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100, 455 loops_per_jiffy); 456 return 0; 457 } 458 459 static void *c_start(struct seq_file *m, loff_t *pos) 460 { 461 return *pos < 1 ? (void *)1 : NULL; 462 } 463 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 464 { 465 ++*pos; 466 return NULL; 467 } 468 static void c_stop(struct seq_file *m, void *v) 469 { 470 } 471 const struct seq_operations cpuinfo_op = { 472 .start = c_start, 473 .next = c_next, 474 .stop = c_stop, 475 .show = show_cpuinfo, 476 }; 477 478 #ifdef CONFIG_PROC_HARDWARE 479 static int hardware_proc_show(struct seq_file *m, void *v) 480 { 481 char model[80]; 482 unsigned long mem; 483 int i; 484 485 if (mach_get_model) 486 mach_get_model(model); 487 else 488 strcpy(model, "Unknown m68k"); 489 490 seq_printf(m, "Model:\t\t%s\n", model); 491 for (mem = 0, i = 0; i < m68k_num_memory; i++) 492 mem += m68k_memory[i].size; 493 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10); 494 495 if (mach_get_hardware_list) 496 mach_get_hardware_list(m); 497 498 return 0; 499 } 500 501 static int __init proc_hardware_init(void) 502 { 503 proc_create_single("hardware", 0, NULL, hardware_proc_show); 504 return 0; 505 } 506 module_init(proc_hardware_init); 507 #endif 508 509 void __init arch_cpu_finalize_init(void) 510 { 511 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU) 512 if (m68k_fputype == 0) { 513 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, " 514 "WHICH IS REQUIRED BY LINUX/M68K ***\n"); 515 pr_emerg("Upgrade your hardware or join the FPU " 516 "emulation project\n"); 517 panic("no FPU"); 518 } 519 #endif /* !CONFIG_M68KFPU_EMU */ 520 } 521 522 #ifdef CONFIG_ADB 523 static int __init adb_probe_sync_enable (char *str) { 524 extern int __adb_probe_sync; 525 __adb_probe_sync = 1; 526 return 1; 527 } 528 529 __setup("adb_sync", adb_probe_sync_enable); 530 #endif /* CONFIG_ADB */ 531 532 #if IS_ENABLED(CONFIG_NVRAM) 533 #ifdef CONFIG_MAC 534 static unsigned char m68k_nvram_read_byte(int addr) 535 { 536 if (MACH_IS_MAC) 537 return mac_pram_read_byte(addr); 538 return 0xff; 539 } 540 541 static void m68k_nvram_write_byte(unsigned char val, int addr) 542 { 543 if (MACH_IS_MAC) 544 mac_pram_write_byte(val, addr); 545 } 546 #endif /* CONFIG_MAC */ 547 548 #ifdef CONFIG_ATARI 549 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos) 550 { 551 if (MACH_IS_ATARI) 552 return atari_nvram_read(buf, count, ppos); 553 else if (MACH_IS_MAC) 554 return nvram_read_bytes(buf, count, ppos); 555 return -EINVAL; 556 } 557 558 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos) 559 { 560 if (MACH_IS_ATARI) 561 return atari_nvram_write(buf, count, ppos); 562 else if (MACH_IS_MAC) 563 return nvram_write_bytes(buf, count, ppos); 564 return -EINVAL; 565 } 566 567 static long m68k_nvram_set_checksum(void) 568 { 569 if (MACH_IS_ATARI) 570 return atari_nvram_set_checksum(); 571 return -EINVAL; 572 } 573 574 static long m68k_nvram_initialize(void) 575 { 576 if (MACH_IS_ATARI) 577 return atari_nvram_initialize(); 578 return -EINVAL; 579 } 580 #endif /* CONFIG_ATARI */ 581 582 static ssize_t m68k_nvram_get_size(void) 583 { 584 if (MACH_IS_ATARI) 585 return atari_nvram_get_size(); 586 else if (MACH_IS_MAC) 587 return mac_pram_get_size(); 588 return -ENODEV; 589 } 590 591 /* Atari device drivers call .read (to get checksum validation) whereas 592 * Mac and PowerMac device drivers just use .read_byte. 593 */ 594 const struct nvram_ops arch_nvram_ops = { 595 #ifdef CONFIG_MAC 596 .read_byte = m68k_nvram_read_byte, 597 .write_byte = m68k_nvram_write_byte, 598 #endif 599 #ifdef CONFIG_ATARI 600 .read = m68k_nvram_read, 601 .write = m68k_nvram_write, 602 .set_checksum = m68k_nvram_set_checksum, 603 .initialize = m68k_nvram_initialize, 604 #endif 605 .get_size = m68k_nvram_get_size, 606 }; 607 EXPORT_SYMBOL(arch_nvram_ops); 608 #endif /* CONFIG_NVRAM */ 609