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/genhd.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 30 #include <asm/bootinfo.h> 31 #include <asm/byteorder.h> 32 #include <asm/sections.h> 33 #include <asm/setup.h> 34 #include <asm/fpu.h> 35 #include <asm/irq.h> 36 #include <asm/io.h> 37 #include <asm/machdep.h> 38 #ifdef CONFIG_AMIGA 39 #include <asm/amigahw.h> 40 #endif 41 #include <asm/atarihw.h> 42 #ifdef CONFIG_ATARI 43 #include <asm/atari_stram.h> 44 #endif 45 #ifdef CONFIG_SUN3X 46 #include <asm/dvma.h> 47 #endif 48 #include <asm/macintosh.h> 49 #include <asm/natfeat.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) (irq_handler_t handler) __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 /* machine dependent timer functions */ 91 int (*mach_hwclk) (int, struct rtc_time*); 92 EXPORT_SYMBOL(mach_hwclk); 93 unsigned int (*mach_get_ss)(void); 94 int (*mach_get_rtc_pll)(struct rtc_pll_info *); 95 int (*mach_set_rtc_pll)(struct rtc_pll_info *); 96 EXPORT_SYMBOL(mach_get_ss); 97 EXPORT_SYMBOL(mach_get_rtc_pll); 98 EXPORT_SYMBOL(mach_set_rtc_pll); 99 void (*mach_reset)( void ); 100 void (*mach_halt)( void ); 101 void (*mach_power_off)( void ); 102 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */ 103 #ifdef CONFIG_HEARTBEAT 104 void (*mach_heartbeat) (int); 105 EXPORT_SYMBOL(mach_heartbeat); 106 #endif 107 #ifdef CONFIG_M68K_L2_CACHE 108 void (*mach_l2_flush) (int); 109 #endif 110 #if defined(CONFIG_ISA) && defined(MULTI_ISA) 111 int isa_type; 112 int isa_sex; 113 EXPORT_SYMBOL(isa_type); 114 EXPORT_SYMBOL(isa_sex); 115 #endif 116 117 extern int amiga_parse_bootinfo(const struct bi_record *); 118 extern int atari_parse_bootinfo(const struct bi_record *); 119 extern int mac_parse_bootinfo(const struct bi_record *); 120 extern int q40_parse_bootinfo(const struct bi_record *); 121 extern int bvme6000_parse_bootinfo(const struct bi_record *); 122 extern int mvme16x_parse_bootinfo(const struct bi_record *); 123 extern int mvme147_parse_bootinfo(const struct bi_record *); 124 extern int hp300_parse_bootinfo(const struct bi_record *); 125 extern int apollo_parse_bootinfo(const struct bi_record *); 126 127 extern void config_amiga(void); 128 extern void config_atari(void); 129 extern void config_mac(void); 130 extern void config_sun3(void); 131 extern void config_apollo(void); 132 extern void config_mvme147(void); 133 extern void config_mvme16x(void); 134 extern void config_bvme6000(void); 135 extern void config_hp300(void); 136 extern void config_q40(void); 137 extern void config_sun3x(void); 138 139 #define MASK_256K 0xfffc0000 140 141 extern void paging_init(void); 142 143 static void __init m68k_parse_bootinfo(const struct bi_record *record) 144 { 145 uint16_t tag; 146 147 save_bootinfo(record); 148 149 while ((tag = be16_to_cpu(record->tag)) != BI_LAST) { 150 int unknown = 0; 151 const void *data = record->data; 152 uint16_t size = be16_to_cpu(record->size); 153 154 switch (tag) { 155 case BI_MACHTYPE: 156 case BI_CPUTYPE: 157 case BI_FPUTYPE: 158 case BI_MMUTYPE: 159 /* Already set up by head.S */ 160 break; 161 162 case BI_MEMCHUNK: 163 if (m68k_num_memory < NUM_MEMINFO) { 164 const struct mem_info *m = data; 165 m68k_memory[m68k_num_memory].addr = 166 be32_to_cpu(m->addr); 167 m68k_memory[m68k_num_memory].size = 168 be32_to_cpu(m->size); 169 m68k_num_memory++; 170 } else 171 pr_warn("%s: too many memory chunks\n", 172 __func__); 173 break; 174 175 case BI_RAMDISK: 176 { 177 const struct mem_info *m = data; 178 m68k_ramdisk.addr = be32_to_cpu(m->addr); 179 m68k_ramdisk.size = be32_to_cpu(m->size); 180 } 181 break; 182 183 case BI_COMMAND_LINE: 184 strlcpy(m68k_command_line, data, 185 sizeof(m68k_command_line)); 186 break; 187 188 default: 189 if (MACH_IS_AMIGA) 190 unknown = amiga_parse_bootinfo(record); 191 else if (MACH_IS_ATARI) 192 unknown = atari_parse_bootinfo(record); 193 else if (MACH_IS_MAC) 194 unknown = mac_parse_bootinfo(record); 195 else if (MACH_IS_Q40) 196 unknown = q40_parse_bootinfo(record); 197 else if (MACH_IS_BVME6000) 198 unknown = bvme6000_parse_bootinfo(record); 199 else if (MACH_IS_MVME16x) 200 unknown = mvme16x_parse_bootinfo(record); 201 else if (MACH_IS_MVME147) 202 unknown = mvme147_parse_bootinfo(record); 203 else if (MACH_IS_HP300) 204 unknown = hp300_parse_bootinfo(record); 205 else if (MACH_IS_APOLLO) 206 unknown = apollo_parse_bootinfo(record); 207 else 208 unknown = 1; 209 } 210 if (unknown) 211 pr_warn("%s: unknown tag 0x%04x ignored\n", __func__, 212 tag); 213 record = (struct bi_record *)((unsigned long)record + size); 214 } 215 216 m68k_realnum_memory = m68k_num_memory; 217 #ifdef CONFIG_SINGLE_MEMORY_CHUNK 218 if (m68k_num_memory > 1) { 219 pr_warn("%s: ignoring last %i chunks of physical memory\n", 220 __func__, (m68k_num_memory - 1)); 221 m68k_num_memory = 1; 222 } 223 #endif 224 } 225 226 void __init setup_arch(char **cmdline_p) 227 { 228 /* The bootinfo is located right after the kernel */ 229 if (!CPU_IS_COLDFIRE) 230 m68k_parse_bootinfo((const struct bi_record *)_end); 231 232 if (CPU_IS_040) 233 m68k_is040or060 = 4; 234 else if (CPU_IS_060) 235 m68k_is040or060 = 6; 236 237 /* FIXME: m68k_fputype is passed in by Penguin booter, which can 238 * be confused by software FPU emulation. BEWARE. 239 * We should really do our own FPU check at startup. 240 * [what do we do with buggy 68LC040s? if we have problems 241 * with them, we should add a test to check_bugs() below] */ 242 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY) 243 /* clear the fpu if we have one */ 244 if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) { 245 volatile int zero = 0; 246 asm volatile ("frestore %0" : : "m" (zero)); 247 } 248 #endif 249 250 if (CPU_IS_060) { 251 u32 pcr; 252 253 asm (".chip 68060; movec %%pcr,%0; .chip 68k" 254 : "=d" (pcr)); 255 if (((pcr >> 8) & 0xff) <= 5) { 256 pr_warn("Enabling workaround for errata I14\n"); 257 asm (".chip 68060; movec %0,%%pcr; .chip 68k" 258 : : "d" (pcr | 0x20)); 259 } 260 } 261 262 init_mm.start_code = PAGE_OFFSET; 263 init_mm.end_code = (unsigned long)_etext; 264 init_mm.end_data = (unsigned long)_edata; 265 init_mm.brk = (unsigned long)_end; 266 267 #if defined(CONFIG_BOOTPARAM) 268 strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE); 269 m68k_command_line[CL_SIZE - 1] = 0; 270 #endif /* CONFIG_BOOTPARAM */ 271 process_uboot_commandline(&m68k_command_line[0], CL_SIZE); 272 *cmdline_p = m68k_command_line; 273 memcpy(boot_command_line, *cmdline_p, CL_SIZE); 274 275 parse_early_param(); 276 277 #ifdef CONFIG_DUMMY_CONSOLE 278 conswitchp = &dummy_con; 279 #endif 280 281 switch (m68k_machtype) { 282 #ifdef CONFIG_AMIGA 283 case MACH_AMIGA: 284 config_amiga(); 285 break; 286 #endif 287 #ifdef CONFIG_ATARI 288 case MACH_ATARI: 289 config_atari(); 290 break; 291 #endif 292 #ifdef CONFIG_MAC 293 case MACH_MAC: 294 config_mac(); 295 break; 296 #endif 297 #ifdef CONFIG_SUN3 298 case MACH_SUN3: 299 config_sun3(); 300 break; 301 #endif 302 #ifdef CONFIG_APOLLO 303 case MACH_APOLLO: 304 config_apollo(); 305 break; 306 #endif 307 #ifdef CONFIG_MVME147 308 case MACH_MVME147: 309 config_mvme147(); 310 break; 311 #endif 312 #ifdef CONFIG_MVME16x 313 case MACH_MVME16x: 314 config_mvme16x(); 315 break; 316 #endif 317 #ifdef CONFIG_BVME6000 318 case MACH_BVME6000: 319 config_bvme6000(); 320 break; 321 #endif 322 #ifdef CONFIG_HP300 323 case MACH_HP300: 324 config_hp300(); 325 break; 326 #endif 327 #ifdef CONFIG_Q40 328 case MACH_Q40: 329 config_q40(); 330 break; 331 #endif 332 #ifdef CONFIG_SUN3X 333 case MACH_SUN3X: 334 config_sun3x(); 335 break; 336 #endif 337 #ifdef CONFIG_COLDFIRE 338 case MACH_M54XX: 339 case MACH_M5441X: 340 cf_bootmem_alloc(); 341 cf_mmu_context_init(); 342 config_BSP(NULL, 0); 343 break; 344 #endif 345 default: 346 panic("No configuration setup"); 347 } 348 349 paging_init(); 350 351 #ifdef CONFIG_NATFEAT 352 nf_init(); 353 #endif 354 355 #ifndef CONFIG_SUN3 356 #ifdef CONFIG_BLK_DEV_INITRD 357 if (m68k_ramdisk.size) { 358 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size); 359 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr); 360 initrd_end = initrd_start + m68k_ramdisk.size; 361 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end); 362 } 363 #endif 364 365 #ifdef CONFIG_ATARI 366 if (MACH_IS_ATARI) 367 atari_stram_reserve_pages((void *)availmem); 368 #endif 369 #ifdef CONFIG_SUN3X 370 if (MACH_IS_SUN3X) { 371 dvma_init(); 372 } 373 #endif 374 375 #endif /* !CONFIG_SUN3 */ 376 377 /* set ISA defs early as possible */ 378 #if defined(CONFIG_ISA) && defined(MULTI_ISA) 379 if (MACH_IS_Q40) { 380 isa_type = ISA_TYPE_Q40; 381 isa_sex = 0; 382 } 383 #ifdef CONFIG_AMIGA_PCMCIA 384 if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) { 385 isa_type = ISA_TYPE_AG; 386 isa_sex = 1; 387 } 388 #endif 389 #ifdef CONFIG_ATARI_ROM_ISA 390 if (MACH_IS_ATARI) { 391 isa_type = ISA_TYPE_ENEC; 392 isa_sex = 0; 393 } 394 #endif 395 #endif 396 } 397 398 static int show_cpuinfo(struct seq_file *m, void *v) 399 { 400 const char *cpu, *mmu, *fpu; 401 unsigned long clockfreq, clockfactor; 402 403 #define LOOP_CYCLES_68020 (8) 404 #define LOOP_CYCLES_68030 (8) 405 #define LOOP_CYCLES_68040 (3) 406 #define LOOP_CYCLES_68060 (1) 407 #define LOOP_CYCLES_COLDFIRE (2) 408 409 if (CPU_IS_020) { 410 cpu = "68020"; 411 clockfactor = LOOP_CYCLES_68020; 412 } else if (CPU_IS_030) { 413 cpu = "68030"; 414 clockfactor = LOOP_CYCLES_68030; 415 } else if (CPU_IS_040) { 416 cpu = "68040"; 417 clockfactor = LOOP_CYCLES_68040; 418 } else if (CPU_IS_060) { 419 cpu = "68060"; 420 clockfactor = LOOP_CYCLES_68060; 421 } else if (CPU_IS_COLDFIRE) { 422 cpu = "ColdFire"; 423 clockfactor = LOOP_CYCLES_COLDFIRE; 424 } else { 425 cpu = "680x0"; 426 clockfactor = 0; 427 } 428 429 #ifdef CONFIG_M68KFPU_EMU_ONLY 430 fpu = "none(soft float)"; 431 #else 432 if (m68k_fputype & FPU_68881) 433 fpu = "68881"; 434 else if (m68k_fputype & FPU_68882) 435 fpu = "68882"; 436 else if (m68k_fputype & FPU_68040) 437 fpu = "68040"; 438 else if (m68k_fputype & FPU_68060) 439 fpu = "68060"; 440 else if (m68k_fputype & FPU_SUNFPA) 441 fpu = "Sun FPA"; 442 else if (m68k_fputype & FPU_COLDFIRE) 443 fpu = "ColdFire"; 444 else 445 fpu = "none"; 446 #endif 447 448 if (m68k_mmutype & MMU_68851) 449 mmu = "68851"; 450 else if (m68k_mmutype & MMU_68030) 451 mmu = "68030"; 452 else if (m68k_mmutype & MMU_68040) 453 mmu = "68040"; 454 else if (m68k_mmutype & MMU_68060) 455 mmu = "68060"; 456 else if (m68k_mmutype & MMU_SUN3) 457 mmu = "Sun-3"; 458 else if (m68k_mmutype & MMU_APOLLO) 459 mmu = "Apollo"; 460 else if (m68k_mmutype & MMU_COLDFIRE) 461 mmu = "ColdFire"; 462 else 463 mmu = "unknown"; 464 465 clockfreq = loops_per_jiffy * HZ * clockfactor; 466 467 seq_printf(m, "CPU:\t\t%s\n" 468 "MMU:\t\t%s\n" 469 "FPU:\t\t%s\n" 470 "Clocking:\t%lu.%1luMHz\n" 471 "BogoMips:\t%lu.%02lu\n" 472 "Calibration:\t%lu loops\n", 473 cpu, mmu, fpu, 474 clockfreq/1000000,(clockfreq/100000)%10, 475 loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100, 476 loops_per_jiffy); 477 return 0; 478 } 479 480 static void *c_start(struct seq_file *m, loff_t *pos) 481 { 482 return *pos < 1 ? (void *)1 : NULL; 483 } 484 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 485 { 486 ++*pos; 487 return NULL; 488 } 489 static void c_stop(struct seq_file *m, void *v) 490 { 491 } 492 const struct seq_operations cpuinfo_op = { 493 .start = c_start, 494 .next = c_next, 495 .stop = c_stop, 496 .show = show_cpuinfo, 497 }; 498 499 #ifdef CONFIG_PROC_HARDWARE 500 static int hardware_proc_show(struct seq_file *m, void *v) 501 { 502 char model[80]; 503 unsigned long mem; 504 int i; 505 506 if (mach_get_model) 507 mach_get_model(model); 508 else 509 strcpy(model, "Unknown m68k"); 510 511 seq_printf(m, "Model:\t\t%s\n", model); 512 for (mem = 0, i = 0; i < m68k_num_memory; i++) 513 mem += m68k_memory[i].size; 514 seq_printf(m, "System Memory:\t%ldK\n", mem >> 10); 515 516 if (mach_get_hardware_list) 517 mach_get_hardware_list(m); 518 519 return 0; 520 } 521 522 static int __init proc_hardware_init(void) 523 { 524 proc_create_single("hardware", 0, NULL, hardware_proc_show); 525 return 0; 526 } 527 module_init(proc_hardware_init); 528 #endif 529 530 void check_bugs(void) 531 { 532 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU) 533 if (m68k_fputype == 0) { 534 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, " 535 "WHICH IS REQUIRED BY LINUX/M68K ***\n"); 536 pr_emerg("Upgrade your hardware or join the FPU " 537 "emulation project\n"); 538 panic("no FPU"); 539 } 540 #endif /* !CONFIG_M68KFPU_EMU */ 541 } 542 543 #ifdef CONFIG_ADB 544 static int __init adb_probe_sync_enable (char *str) { 545 extern int __adb_probe_sync; 546 __adb_probe_sync = 1; 547 return 1; 548 } 549 550 __setup("adb_sync", adb_probe_sync_enable); 551 #endif /* CONFIG_ADB */ 552 553 #if IS_ENABLED(CONFIG_NVRAM) 554 #ifdef CONFIG_MAC 555 static unsigned char m68k_nvram_read_byte(int addr) 556 { 557 if (MACH_IS_MAC) 558 return mac_pram_read_byte(addr); 559 return 0xff; 560 } 561 562 static void m68k_nvram_write_byte(unsigned char val, int addr) 563 { 564 if (MACH_IS_MAC) 565 mac_pram_write_byte(val, addr); 566 } 567 #endif /* CONFIG_MAC */ 568 569 #ifdef CONFIG_ATARI 570 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos) 571 { 572 if (MACH_IS_ATARI) 573 return atari_nvram_read(buf, count, ppos); 574 else if (MACH_IS_MAC) 575 return nvram_read_bytes(buf, count, ppos); 576 return -EINVAL; 577 } 578 579 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos) 580 { 581 if (MACH_IS_ATARI) 582 return atari_nvram_write(buf, count, ppos); 583 else if (MACH_IS_MAC) 584 return nvram_write_bytes(buf, count, ppos); 585 return -EINVAL; 586 } 587 588 static long m68k_nvram_set_checksum(void) 589 { 590 if (MACH_IS_ATARI) 591 return atari_nvram_set_checksum(); 592 return -EINVAL; 593 } 594 595 static long m68k_nvram_initialize(void) 596 { 597 if (MACH_IS_ATARI) 598 return atari_nvram_initialize(); 599 return -EINVAL; 600 } 601 #endif /* CONFIG_ATARI */ 602 603 static ssize_t m68k_nvram_get_size(void) 604 { 605 if (MACH_IS_ATARI) 606 return atari_nvram_get_size(); 607 else if (MACH_IS_MAC) 608 return mac_pram_get_size(); 609 return -ENODEV; 610 } 611 612 /* Atari device drivers call .read (to get checksum validation) whereas 613 * Mac and PowerMac device drivers just use .read_byte. 614 */ 615 const struct nvram_ops arch_nvram_ops = { 616 #ifdef CONFIG_MAC 617 .read_byte = m68k_nvram_read_byte, 618 .write_byte = m68k_nvram_write_byte, 619 #endif 620 #ifdef CONFIG_ATARI 621 .read = m68k_nvram_read, 622 .write = m68k_nvram_write, 623 .set_checksum = m68k_nvram_set_checksum, 624 .initialize = m68k_nvram_initialize, 625 #endif 626 .get_size = m68k_nvram_get_size, 627 }; 628 EXPORT_SYMBOL(arch_nvram_ops); 629 #endif /* CONFIG_NVRAM */ 630