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          * Initialise the static keys early as they may be enabled by the
 254          * cpufeature code and early parameters.
 255          */
 256         jump_label_init();
 257         parse_early_param();
 258
 259         switch (m68k_machtype) {
 260 #ifdef CONFIG_AMIGA
 261         case MACH_AMIGA:
 262                 config_amiga();
 263                 break;
 264 #endif
 265 #ifdef CONFIG_ATARI
 266         case MACH_ATARI:
 267                 config_atari();
 268                 break;
 269 #endif
 270 #ifdef CONFIG_MAC
 271         case MACH_MAC:
 272                 config_mac();
 273                 break;
 274 #endif
 275 #ifdef CONFIG_SUN3
 276         case MACH_SUN3:
 277                 config_sun3();
 278                 break;
 279 #endif
 280 #ifdef CONFIG_APOLLO
 281         case MACH_APOLLO:
 282                 config_apollo();
 283                 break;
 284 #endif
 285 #ifdef CONFIG_MVME147
 286         case MACH_MVME147:
 287                 config_mvme147();
 288                 break;
 289 #endif
 290 #ifdef CONFIG_MVME16x
 291         case MACH_MVME16x:
 292                 config_mvme16x();
 293                 break;
 294 #endif
 295 #ifdef CONFIG_BVME6000
 296         case MACH_BVME6000:
 297                 config_bvme6000();
 298                 break;
 299 #endif
 300 #ifdef CONFIG_HP300
 301         case MACH_HP300:
 302                 config_hp300();
 303                 break;
 304 #endif
 305 #ifdef CONFIG_Q40
 306         case MACH_Q40:
 307                 config_q40();
 308                 break;
 309 #endif
 310 #ifdef CONFIG_SUN3X
 311         case MACH_SUN3X:
 312                 config_sun3x();
 313                 break;
 314 #endif
 315 #ifdef CONFIG_COLDFIRE
 316         case MACH_M54XX:
 317         case MACH_M5441X:
 318                 cf_bootmem_alloc();
 319                 cf_mmu_context_init();
 320                 config_BSP(NULL, 0);
 321                 break;
 322 #endif
 323 #ifdef CONFIG_VIRT
 324         case MACH_VIRT:
 325                 config_virt();
 326                 break;
 327 #endif
 328         default:
 329                 panic("No configuration setup");
 330         }
 331
 332         if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
 333                 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
 334
 335         paging_init();
 336
 337         if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
 338                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 339                 initrd_end = initrd_start + m68k_ramdisk.size;
 340                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 341         }
 342
 343 #ifdef CONFIG_NATFEAT
 344         nf_init();
 345 #endif
 346
 347 #ifdef CONFIG_ATARI
 348         if (MACH_IS_ATARI)
 349                 atari_stram_reserve_pages((void *)availmem);
 350 #endif
 351 #ifdef CONFIG_SUN3X
 352         if (MACH_IS_SUN3X) {
 353                 dvma_init();
 354         }
 355 #endif
 356
 357 /* set ISA defs early as possible */
 358 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 359         if (MACH_IS_Q40) {
 360                 isa_type = ISA_TYPE_Q40;
 361                 isa_sex = 0;
 362         }
 363 #ifdef CONFIG_AMIGA_PCMCIA
 364         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 365                 isa_type = ISA_TYPE_AG;
 366                 isa_sex = 1;
 367         }
 368 #endif
 369 #ifdef CONFIG_ATARI_ROM_ISA
 370         if (MACH_IS_ATARI) {
 371                 isa_type = ISA_TYPE_ENEC;
 372                 isa_sex = 0;
 373         }
 374 #endif
 375 #endif
 376 }
 377
 378 static int show_cpuinfo(struct seq_file *m, void *v)
 379 {
 380         const char *cpu, *mmu, *fpu;
 381         unsigned long clockfreq, clockfactor;
 382
 383 #define LOOP_CYCLES_68020       (8)
 384 #define LOOP_CYCLES_68030       (8)
 385 #define LOOP_CYCLES_68040       (3)
 386 #define LOOP_CYCLES_68060       (1)
 387 #define LOOP_CYCLES_COLDFIRE    (2)
 388
 389         if (CPU_IS_020) {
 390                 cpu = "68020";
 391                 clockfactor = LOOP_CYCLES_68020;
 392         } else if (CPU_IS_030) {
 393                 cpu = "68030";
 394                 clockfactor = LOOP_CYCLES_68030;
 395         } else if (CPU_IS_040) {
 396                 cpu = "68040";
 397                 clockfactor = LOOP_CYCLES_68040;
 398         } else if (CPU_IS_060) {
 399                 cpu = "68060";
 400                 clockfactor = LOOP_CYCLES_68060;
 401         } else if (CPU_IS_COLDFIRE) {
 402                 cpu = "ColdFire";
 403                 clockfactor = LOOP_CYCLES_COLDFIRE;
 404         } else {
 405                 cpu = "680x0";
 406                 clockfactor = 0;
 407         }
 408
 409 #ifdef CONFIG_M68KFPU_EMU_ONLY
 410         fpu = "none(soft float)";
 411 #else
 412         if (m68k_fputype & FPU_68881)
 413                 fpu = "68881";
 414         else if (m68k_fputype & FPU_68882)
 415                 fpu = "68882";
 416         else if (m68k_fputype & FPU_68040)
 417                 fpu = "68040";
 418         else if (m68k_fputype & FPU_68060)
 419                 fpu = "68060";
 420         else if (m68k_fputype & FPU_SUNFPA)
 421                 fpu = "Sun FPA";
 422         else if (m68k_fputype & FPU_COLDFIRE)
 423                 fpu = "ColdFire";
 424         else
 425                 fpu = "none";
 426 #endif
 427
 428         if (m68k_mmutype & MMU_68851)
 429                 mmu = "68851";
 430         else if (m68k_mmutype & MMU_68030)
 431                 mmu = "68030";
 432         else if (m68k_mmutype & MMU_68040)
 433                 mmu = "68040";
 434         else if (m68k_mmutype & MMU_68060)
 435                 mmu = "68060";
 436         else if (m68k_mmutype & MMU_SUN3)
 437                 mmu = "Sun-3";
 438         else if (m68k_mmutype & MMU_APOLLO)
 439                 mmu = "Apollo";
 440         else if (m68k_mmutype & MMU_COLDFIRE)
 441                 mmu = "ColdFire";
 442         else
 443                 mmu = "unknown";
 444
 445         clockfreq = loops_per_jiffy * HZ * clockfactor;
 446
 447         seq_printf(m, "CPU:\t\t%s\n"
 448                    "MMU:\t\t%s\n"
 449                    "FPU:\t\t%s\n"
 450                    "Clocking:\t%lu.%1luMHz\n"
 451                    "BogoMips:\t%lu.%02lu\n"
 452                    "Calibration:\t%lu loops\n",
 453                    cpu, mmu, fpu,
 454                    clockfreq/1000000,(clockfreq/100000)%10,
 455                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 456                    loops_per_jiffy);
 457         return 0;
 458 }
 459
 460 static void *c_start(struct seq_file *m, loff_t *pos)
 461 {
 462         return *pos < 1 ? (void *)1 : NULL;
 463 }
 464 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 465 {
 466         ++*pos;
 467         return NULL;
 468 }
 469 static void c_stop(struct seq_file *m, void *v)
 470 {
 471 }
 472 const struct seq_operations cpuinfo_op = {
 473         .start  = c_start,
 474         .next   = c_next,
 475         .stop   = c_stop,
 476         .show   = show_cpuinfo,
 477 };
 478
 479 #ifdef CONFIG_PROC_HARDWARE
 480 static int hardware_proc_show(struct seq_file *m, void *v)
 481 {
 482         char model[80];
 483         unsigned long mem;
 484         int i;
 485
 486         if (mach_get_model)
 487                 mach_get_model(model);
 488         else
 489                 strcpy(model, "Unknown m68k");
 490
 491         seq_printf(m, "Model:\t\t%s\n", model);
 492         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 493                 mem += m68k_memory[i].size;
 494         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 495
 496         if (mach_get_hardware_list)
 497                 mach_get_hardware_list(m);
 498
 499         return 0;
 500 }
 501
 502 static int __init proc_hardware_init(void)
 503 {
 504         proc_create_single("hardware", 0, NULL, hardware_proc_show);
 505         return 0;
 506 }
 507 module_init(proc_hardware_init);
 508 #endif
 509
 510 void __init arch_cpu_finalize_init(void)
 511 {
 512 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 513         if (m68k_fputype == 0) {
 514                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 515                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 516                 pr_emerg("Upgrade your hardware or join the FPU "
 517                         "emulation project\n");
 518                 panic("no FPU");
 519         }
 520 #endif /* !CONFIG_M68KFPU_EMU */
 521 }
 522
 523 #ifdef CONFIG_ADB
 524 static int __init adb_probe_sync_enable (char *str) {
 525         extern int __adb_probe_sync;
 526         __adb_probe_sync = 1;
 527         return 1;
 528 }
 529
 530 __setup("adb_sync", adb_probe_sync_enable);
 531 #endif /* CONFIG_ADB */
 532
 533 #if IS_ENABLED(CONFIG_NVRAM)
 534 #ifdef CONFIG_MAC
 535 static unsigned char m68k_nvram_read_byte(int addr)
 536 {
 537         if (MACH_IS_MAC)
 538                 return mac_pram_read_byte(addr);
 539         return 0xff;
 540 }
 541
 542 static void m68k_nvram_write_byte(unsigned char val, int addr)
 543 {
 544         if (MACH_IS_MAC)
 545                 mac_pram_write_byte(val, addr);
 546 }
 547 #endif /* CONFIG_MAC */
 548
 549 #ifdef CONFIG_ATARI
 550 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
 551 {
 552         if (MACH_IS_ATARI)
 553                 return atari_nvram_read(buf, count, ppos);
 554         else if (MACH_IS_MAC)
 555                 return nvram_read_bytes(buf, count, ppos);
 556         return -EINVAL;
 557 }
 558
 559 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
 560 {
 561         if (MACH_IS_ATARI)
 562                 return atari_nvram_write(buf, count, ppos);
 563         else if (MACH_IS_MAC)
 564                 return nvram_write_bytes(buf, count, ppos);
 565         return -EINVAL;
 566 }
 567
 568 static long m68k_nvram_set_checksum(void)
 569 {
 570         if (MACH_IS_ATARI)
 571                 return atari_nvram_set_checksum();
 572         return -EINVAL;
 573 }
 574
 575 static long m68k_nvram_initialize(void)
 576 {
 577         if (MACH_IS_ATARI)
 578                 return atari_nvram_initialize();
 579         return -EINVAL;
 580 }
 581 #endif /* CONFIG_ATARI */
 582
 583 static ssize_t m68k_nvram_get_size(void)
 584 {
 585         if (MACH_IS_ATARI)
 586                 return atari_nvram_get_size();
 587         else if (MACH_IS_MAC)
 588                 return mac_pram_get_size();
 589         return -ENODEV;
 590 }
 591
 592 /* Atari device drivers call .read (to get checksum validation) whereas
 593  * Mac and PowerMac device drivers just use .read_byte.
 594  */
 595 const struct nvram_ops arch_nvram_ops = {
 596 #ifdef CONFIG_MAC
 597         .read_byte      = m68k_nvram_read_byte,
 598         .write_byte     = m68k_nvram_write_byte,
 599 #endif
 600 #ifdef CONFIG_ATARI
 601         .read           = m68k_nvram_read,
 602         .write          = m68k_nvram_write,
 603         .set_checksum   = m68k_nvram_set_checksum,
 604         .initialize     = m68k_nvram_initialize,
 605 #endif
 606         .get_size       = m68k_nvram_get_size,
 607 };
 608 EXPORT_SYMBOL(arch_nvram_ops);
 609 #endif /* CONFIG_NVRAM */