arch/m68k/kernel/setup_mm.c

   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 */