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/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 */