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 sizeof(m68k_command_line)); 152 break; 153 154 case BI_RNG_SEED: { 155 u16 len = be16_to_cpup(data); 156 add_bootloader_randomness(data + 2, len); 157 /* 158 * Zero the data to preserve forward secrecy, and zero the 159 * length to prevent kexec from using it. 160 */ 161 memzero_explicit((void *)data, len + 2); 162 break; 163 } 164 165 default: 166 if (MACH_IS_AMIGA) 167 unknown = amiga_parse_bootinfo(record); 168 else if (MACH_IS_ATARI) 169 unknown = atari_parse_bootinfo(record); 170 else if (MACH_IS_MAC) 171 unknown = mac_parse_bootinfo(record); 172 else if (MACH_IS_Q40) 173 unknown = q40_parse_bootinfo(record); 174 else if (MACH_IS_BVME6000) 175 unknown = bvme6000_parse_bootinfo(record); 176 else if (MACH_IS_MVME16x) 177 unknown = mvme16x_parse_bootinfo(record); 178 else if (MACH_IS_MVME147) 179 unknown = mvme147_parse_bootinfo(record); 180 else if (MACH_IS_HP300) 181 unknown = hp300_parse_bootinfo(record); 182 else if (MACH_IS_APOLLO) 183 unknown = apollo_parse_bootinfo(record); 184 else if (MACH_IS_VIRT) 185 unknown = virt_parse_bootinfo(record); 186 else 187 unknown = 1; 188 } 189 if (unknown) 190 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__, 191 tag); 192 record = (struct bi_record *)((unsigned long)record + size); 193 } 194 195 save_bootinfo(first_record); 196 197 m68k_realnum_memory = m68k_num_memory; 198 #ifdef CONFIG_SINGLE_MEMORY_CHUNK 199 if (m68k_num_memory > 1) { 200 pr_warn("%s: ignoring last %i chunks of physical memory\n", 201 __func__, (m68k_num_memory - 1)); 202 m68k_num_memory = 1; 203 } 204 #endif 205 } 206 207 void __init setup_arch(char **cmdline_p) 208 { 209 /* The bootinfo is located right after the kernel */ 210 if (!CPU_IS_COLDFIRE) 211 m68k_parse_bootinfo((const struct bi_record *)_end); 212 213 if (CPU_IS_040) 214 m68k_is040or060 = 4; 215 else if (CPU_IS_060) 216 m68k_is040or060 = 6; 217 218 /* FIXME: m68k_fputype is passed in by Penguin booter, which can 219 * be confused by software FPU emulation. BEWARE. 220 * We should really do our own FPU check at startup. 221 * [what do we do with buggy 68LC040s? if we have problems 222 * with them, we should add a test to check_bugs() below] */ 223 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY) 224 /* clear the fpu if we have one */ 225 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) { 226 volatile int zero = 0; 227 asm volatile ("frestore %0" : : "m" (zero)); 228 } 229 #endif 230 231 if (CPU_IS_060) { 232 u32 pcr; 233 234 asm (".chip 68060; movec %%pcr,%0; .chip 68k" 235 : "=d" (pcr)); 236 if (((pcr >> 8) & 0xff) <= 5) { 237 pr_warn("Enabling workaround for errata I14\n"); 238 asm (".chip 68060; movec %0,%%pcr; .chip 68k" 239 : : "d" (pcr | 0x20)); 240 } 241 } 242 243 setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end); 244 245 #if defined(CONFIG_BOOTPARAM) 246 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE); 247 m68k_command_line[CL_SIZE - 1] = 0; 248 #endif /* CONFIG_BOOTPARAM */ 249 process_uboot_commandline(&m68k_command_line[0], CL_SIZE); 250 *cmdline_p = m68k_command_line; 251 memcpy(boot_command_line, *cmdline_p, CL_SIZE); 252 253 parse_early_param(); 254 255 switch (m68k_machtype) { 256 #ifdef CONFIG_AMIGA 257 case MACH_AMIGA: 258 config_amiga(); 259 break; 260 #endif 261 #ifdef CONFIG_ATARI 262 case MACH_ATARI: 263 config_atari(); 264 break; 265 #endif 266 #ifdef CONFIG_MAC 267 case MACH_MAC: 268 config_mac(); 269 break; 270 #endif 271 #ifdef CONFIG_SUN3 272 case MACH_SUN3: 273 config_sun3(); 274 break; 275 #endif 276 #ifdef CONFIG_APOLLO 277 case MACH_APOLLO: 278 config_apollo(); 279 break; 280 #endif 281 #ifdef CONFIG_MVME147 282 case MACH_MVME147: 283 config_mvme147(); 284 break; 285 #endif 286 #ifdef CONFIG_MVME16x 287 case MACH_MVME16x: 288 config_mvme16x(); 289 break; 290 #endif 291 #ifdef CONFIG_BVME6000 292 case MACH_BVME6000: 293 config_bvme6000(); 294 break; 295 #endif 296 #ifdef CONFIG_HP300 297 case MACH_HP300: 298 config_hp300(); 299 break; 300 #endif 301 #ifdef CONFIG_Q40 302 case MACH_Q40: 303 config_q40(); 304 break; 305 #endif 306 #ifdef CONFIG_SUN3X 307 case MACH_SUN3X: 308 config_sun3x(); 309 break; 310 #endif 311 #ifdef CONFIG_COLDFIRE 312 case MACH_M54XX: 313 case MACH_M5441X: 314 cf_bootmem_alloc(); 315 cf_mmu_context_init(); 316 config_BSP(NULL, 0); 317 break; 318 #endif 319 #ifdef CONFIG_VIRT 320 case MACH_VIRT: 321 config_virt(); 322 break; 323 #endif 324 default: 325 panic("No configuration setup"); 326 } 327 328 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) 329 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size); 330 331 paging_init(); 332 333 if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) { 334 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr); 335 initrd_end = initrd_start + m68k_ramdisk.size; 336 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end); 337 } 338 339 #ifdef CONFIG_NATFEAT 340 nf_init(); 341 #endif 342 343 #ifdef CONFIG_ATARI 344 if (MACH_IS_ATARI) 345 atari_stram_reserve_pages((void *)availmem); 346 #endif 347 #ifdef CONFIG_SUN3X 348 if (MACH_IS_SUN3X) { 349 dvma_init(); 350 } 351 #endif 352 353 /* set ISA defs early as possible */ 354 #if defined(CONFIG_ISA) && defined(MULTI_ISA) 355 if (MACH_IS_Q40) { 356 isa_type = ISA_TYPE_Q40; 357 isa_sex = 0; 358 } 359 #ifdef CONFIG_AMIGA_PCMCIA 360 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) { 361 isa_type = ISA_TYPE_AG; 362 isa_sex = 1; 363 } 364 #endif 365 #ifdef CONFIG_ATARI_ROM_ISA 366 if (MACH_IS_ATARI) { 367 isa_type = ISA_TYPE_ENEC; 368 isa_sex = 0; 369 } 370 #endif 371 #endif 372 } 373 374 static int show_cpuinfo(struct seq_file *m, void *v) 375 { 376 const char *cpu, *mmu, *fpu; 377 unsigned long clockfreq, clockfactor; 378 379 #define LOOP_CYCLES_68020 (8) 380 #define LOOP_CYCLES_68030 (8) 381 #define LOOP_CYCLES_68040 (3) 382 #define LOOP_CYCLES_68060 (1) 383 #define LOOP_CYCLES_COLDFIRE (2) 384 385 if (CPU_IS_020) { 386 cpu = "68020"; 387 clockfactor = LOOP_CYCLES_68020; 388 } else if (CPU_IS_030) { 389 cpu = "68030"; 390 clockfactor = LOOP_CYCLES_68030; 391 } else if (CPU_IS_040) { 392 cpu = "68040"; 393 clockfactor = LOOP_CYCLES_68040; 394 } else if (CPU_IS_060) { 395 cpu = "68060"; 396 clockfactor = LOOP_CYCLES_68060; 397 } else if (CPU_IS_COLDFIRE) { 398 cpu = "ColdFire"; 399 clockfactor = LOOP_CYCLES_COLDFIRE; 400 } else { 401 cpu = "680x0"; 402 clockfactor = 0; 403 } 404 405 #ifdef CONFIG_M68KFPU_EMU_ONLY 406 fpu = "none(soft float)"; 407 #else 408 if (m68k_fputype & FPU_68881) 409 fpu = "68881"; 410 else if (m68k_fputype & FPU_68882) 411 fpu = "68882"; 412 else if (m68k_fputype & FPU_68040) 413 fpu = "68040"; 414 else if (m68k_fputype & FPU_68060) 415 fpu = "68060"; 416 else if (m68k_fputype & FPU_SUNFPA) 417 fpu = "Sun FPA"; 418 else if (m68k_fputype & FPU_COLDFIRE) 419 fpu = "ColdFire"; 420 else 421 fpu = "none"; 422 #endif 423 424 if (m68k_mmutype & MMU_68851) 425 mmu = "68851"; 426 else if (m68k_mmutype & MMU_68030) 427 mmu = "68030"; 428 else if (m68k_mmutype & MMU_68040) 429 mmu = "68040"; 430 else if (m68k_mmutype & MMU_68060) 431 mmu = "68060"; 432 else if (m68k_mmutype & MMU_SUN3) 433 mmu = "Sun-3"; 434 else if (m68k_mmutype & MMU_APOLLO) 435 mmu = "Apollo"; 436 else if (m68k_mmutype & MMU_COLDFIRE) 437 mmu = "ColdFire"; 438 else 439 mmu = "unknown"; 440 441 clockfreq = loops_per_jiffy * HZ * clockfactor; 442 443 seq_printf(m, "CPU:\t\t%s\n" 444 "MMU:\t\t%s\n" 445 "FPU:\t\t%s\n" 446 "Clocking:\t%lu.%1luMHz\n" 447 "BogoMips:\t%lu.%02lu\n" 448 "Calibration:\t%lu loops\n", 449 cpu, mmu, fpu, 450 clockfreq/1000000,(clockfreq/100000)%10, 451 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100, 452 loops_per_jiffy); 453 return 0; 454 } 455 456 static void *c_start(struct seq_file *m, loff_t *pos) 457 { 458 return *pos < 1 ? (void *)1 : NULL; 459 } 460 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 461 { 462 ++*pos; 463 return NULL; 464 } 465 static void c_stop(struct seq_file *m, void *v) 466 { 467 } 468 const struct seq_operations cpuinfo_op = { 469 .start = c_start, 470 .next = c_next, 471 .stop = c_stop, 472 .show = show_cpuinfo, 473 }; 474 475 #ifdef CONFIG_PROC_HARDWARE 476 static int hardware_proc_show(struct seq_file *m, void *v) 477 { 478 char model[80]; 479 unsigned long mem; 480 int i; 481 482 if (mach_get_model) 483 mach_get_model(model); 484 else 485 strcpy(model, "Unknown m68k"); 486 487 seq_printf(m, "Model:\t\t%s\n", model); 488 for (mem = 0, i = 0; i < m68k_num_memory; i++) 489 mem += m68k_memory[i].size; 490 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10); 491 492 if (mach_get_hardware_list) 493 mach_get_hardware_list(m); 494 495 return 0; 496 } 497 498 static int __init proc_hardware_init(void) 499 { 500 proc_create_single("hardware", 0, NULL, hardware_proc_show); 501 return 0; 502 } 503 module_init(proc_hardware_init); 504 #endif 505 506 void __init arch_cpu_finalize_init(void) 507 { 508 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU) 509 if (m68k_fputype == 0) { 510 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, " 511 "WHICH IS REQUIRED BY LINUX/M68K ***\n"); 512 pr_emerg("Upgrade your hardware or join the FPU " 513 "emulation project\n"); 514 panic("no FPU"); 515 } 516 #endif /* !CONFIG_M68KFPU_EMU */ 517 } 518 519 #ifdef CONFIG_ADB 520 static int __init adb_probe_sync_enable (char *str) { 521 extern int __adb_probe_sync; 522 __adb_probe_sync = 1; 523 return 1; 524 } 525 526 __setup("adb_sync", adb_probe_sync_enable); 527 #endif /* CONFIG_ADB */ 528 529 #if IS_ENABLED(CONFIG_NVRAM) 530 #ifdef CONFIG_MAC 531 static unsigned char m68k_nvram_read_byte(int addr) 532 { 533 if (MACH_IS_MAC) 534 return mac_pram_read_byte(addr); 535 return 0xff; 536 } 537 538 static void m68k_nvram_write_byte(unsigned char val, int addr) 539 { 540 if (MACH_IS_MAC) 541 mac_pram_write_byte(val, addr); 542 } 543 #endif /* CONFIG_MAC */ 544 545 #ifdef CONFIG_ATARI 546 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos) 547 { 548 if (MACH_IS_ATARI) 549 return atari_nvram_read(buf, count, ppos); 550 else if (MACH_IS_MAC) 551 return nvram_read_bytes(buf, count, ppos); 552 return -EINVAL; 553 } 554 555 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos) 556 { 557 if (MACH_IS_ATARI) 558 return atari_nvram_write(buf, count, ppos); 559 else if (MACH_IS_MAC) 560 return nvram_write_bytes(buf, count, ppos); 561 return -EINVAL; 562 } 563 564 static long m68k_nvram_set_checksum(void) 565 { 566 if (MACH_IS_ATARI) 567 return atari_nvram_set_checksum(); 568 return -EINVAL; 569 } 570 571 static long m68k_nvram_initialize(void) 572 { 573 if (MACH_IS_ATARI) 574 return atari_nvram_initialize(); 575 return -EINVAL; 576 } 577 #endif /* CONFIG_ATARI */ 578 579 static ssize_t m68k_nvram_get_size(void) 580 { 581 if (MACH_IS_ATARI) 582 return atari_nvram_get_size(); 583 else if (MACH_IS_MAC) 584 return mac_pram_get_size(); 585 return -ENODEV; 586 } 587 588 /* Atari device drivers call .read (to get checksum validation) whereas 589 * Mac and PowerMac device drivers just use .read_byte. 590 */ 591 const struct nvram_ops arch_nvram_ops = { 592 #ifdef CONFIG_MAC 593 .read_byte = m68k_nvram_read_byte, 594 .write_byte = m68k_nvram_write_byte, 595 #endif 596 #ifdef CONFIG_ATARI 597 .read = m68k_nvram_read, 598 .write = m68k_nvram_write, 599 .set_checksum = m68k_nvram_set_checksum, 600 .initialize = m68k_nvram_initialize, 601 #endif 602 .get_size = m68k_nvram_get_size, 603 }; 604 EXPORT_SYMBOL(arch_nvram_ops); 605 #endif /* CONFIG_NVRAM */ 606