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 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 */