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