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