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 #include <linux/random.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 #include <asm/config.h>
  51
  52 #if !FPSTATESIZE || !NR_IRQS
  53 #warning No CPU/platform type selected, your kernel will not work!
  54 #warning Are you building an allnoconfig kernel?
  55 #endif
  56
  57 unsigned long m68k_machtype;
  58 EXPORT_SYMBOL(m68k_machtype);
  59 unsigned long m68k_cputype;
  60 EXPORT_SYMBOL(m68k_cputype);
  61 unsigned long m68k_fputype;
  62 unsigned long m68k_mmutype;
  63 EXPORT_SYMBOL(m68k_mmutype);
  64 #ifdef CONFIG_VME
  65 unsigned long vme_brdtype;
  66 EXPORT_SYMBOL(vme_brdtype);
  67 #endif
  68
  69 int m68k_is040or060;
  70 EXPORT_SYMBOL(m68k_is040or060);
  71
  72 extern unsigned long availmem;
  73
  74 int m68k_num_memory;
  75 EXPORT_SYMBOL(m68k_num_memory);
  76 int m68k_realnum_memory;
  77 EXPORT_SYMBOL(m68k_realnum_memory);
  78 unsigned long m68k_memoffset;
  79 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
  80 EXPORT_SYMBOL(m68k_memory);
  81
  82 static struct m68k_mem_info m68k_ramdisk __initdata;
  83
  84 static char m68k_command_line[CL_SIZE] __initdata;
  85
  86 void (*mach_sched_init) (void) __initdata = NULL;
  87 /* machine dependent irq functions */
  88 void (*mach_init_IRQ) (void) __initdata = NULL;
  89 void (*mach_get_model) (char *model);
  90 void (*mach_get_hardware_list) (struct seq_file *m);
  91 void (*mach_reset)( void );
  92 void (*mach_halt)( void );
  93 #ifdef CONFIG_HEARTBEAT
  94 void (*mach_heartbeat) (int);
  95 EXPORT_SYMBOL(mach_heartbeat);
  96 #endif
  97 #ifdef CONFIG_M68K_L2_CACHE
  98 void (*mach_l2_flush) (int);
  99 #endif
 100 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 101 int isa_type;
 102 int isa_sex;
 103 EXPORT_SYMBOL(isa_type);
 104 EXPORT_SYMBOL(isa_sex);
 105 #endif
 106
 107 #define MASK_256K 0xfffc0000
 108
 109 extern void paging_init(void);
 110
 111 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 112 {
 113         const struct bi_record *first_record = record;
 114         uint16_t tag;
 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                         strscpy(m68k_command_line, data,
 152                                 sizeof(m68k_command_line));
 153                         break;
 154
 155                 case BI_RNG_SEED: {
 156                         u16 len = be16_to_cpup(data);
 157                         add_bootloader_randomness(data + 2, len);
 158                         /*
 159                          * Zero the data to preserve forward secrecy, and zero the
 160                          * length to prevent kexec from using it.
 161                          */
 162                         memzero_explicit((void *)data, len + 2);
 163                         break;
 164                 }
 165
 166                 default:
 167                         if (MACH_IS_AMIGA)
 168                                 unknown = amiga_parse_bootinfo(record);
 169                         else if (MACH_IS_ATARI)
 170                                 unknown = atari_parse_bootinfo(record);
 171                         else if (MACH_IS_MAC)
 172                                 unknown = mac_parse_bootinfo(record);
 173                         else if (MACH_IS_Q40)
 174                                 unknown = q40_parse_bootinfo(record);
 175                         else if (MACH_IS_BVME6000)
 176                                 unknown = bvme6000_parse_bootinfo(record);
 177                         else if (MACH_IS_MVME16x)
 178                                 unknown = mvme16x_parse_bootinfo(record);
 179                         else if (MACH_IS_MVME147)
 180                                 unknown = mvme147_parse_bootinfo(record);
 181                         else if (MACH_IS_HP300)
 182                                 unknown = hp300_parse_bootinfo(record);
 183                         else if (MACH_IS_APOLLO)
 184                                 unknown = apollo_parse_bootinfo(record);
 185                         else if (MACH_IS_VIRT)
 186                                 unknown = virt_parse_bootinfo(record);
 187                         else
 188                                 unknown = 1;
 189                 }
 190                 if (unknown)
 191                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 192                                 tag);
 193                 record = (struct bi_record *)((unsigned long)record + size);
 194         }
 195
 196         save_bootinfo(first_record);
 197
 198         m68k_realnum_memory = m68k_num_memory;
 199 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 200         if (m68k_num_memory > 1) {
 201                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 202                         __func__, (m68k_num_memory - 1));
 203                 m68k_num_memory = 1;
 204         }
 205 #endif
 206 }
 207
 208 void __init setup_arch(char **cmdline_p)
 209 {
 210         /* The bootinfo is located right after the kernel */
 211         if (!CPU_IS_COLDFIRE)
 212                 m68k_parse_bootinfo((const struct bi_record *)_end);
 213
 214         if (CPU_IS_040)
 215                 m68k_is040or060 = 4;
 216         else if (CPU_IS_060)
 217                 m68k_is040or060 = 6;
 218
 219         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 220          * be confused by software FPU emulation. BEWARE.
 221          * We should really do our own FPU check at startup.
 222          * [what do we do with buggy 68LC040s? if we have problems
 223          *  with them, we should add a test to check_bugs() below] */
 224 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 225         /* clear the fpu if we have one */
 226         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 227                 volatile int zero = 0;
 228                 asm volatile ("frestore %0" : : "m" (zero));
 229         }
 230 #endif
 231
 232         if (CPU_IS_060) {
 233                 u32 pcr;
 234
 235                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 236                      : "=d" (pcr));
 237                 if (((pcr >> 8) & 0xff) <= 5) {
 238                         pr_warn("Enabling workaround for errata I14\n");
 239                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 240                              : : "d" (pcr | 0x20));
 241                 }
 242         }
 243
 244         setup_initial_init_mm((void *)PAGE_OFFSET, _etext, _edata, _end);
 245
 246 #if defined(CONFIG_BOOTPARAM)
 247         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 248         m68k_command_line[CL_SIZE - 1] = 0;
 249 #endif /* CONFIG_BOOTPARAM */
 250         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 251         *cmdline_p = m68k_command_line;
 252         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 253
 254         parse_early_param();
 255
 256         switch (m68k_machtype) {
 257 #ifdef CONFIG_AMIGA
 258         case MACH_AMIGA:
 259                 config_amiga();
 260                 break;
 261 #endif
 262 #ifdef CONFIG_ATARI
 263         case MACH_ATARI:
 264                 config_atari();
 265                 break;
 266 #endif
 267 #ifdef CONFIG_MAC
 268         case MACH_MAC:
 269                 config_mac();
 270                 break;
 271 #endif
 272 #ifdef CONFIG_SUN3
 273         case MACH_SUN3:
 274                 config_sun3();
 275                 break;
 276 #endif
 277 #ifdef CONFIG_APOLLO
 278         case MACH_APOLLO:
 279                 config_apollo();
 280                 break;
 281 #endif
 282 #ifdef CONFIG_MVME147
 283         case MACH_MVME147:
 284                 config_mvme147();
 285                 break;
 286 #endif
 287 #ifdef CONFIG_MVME16x
 288         case MACH_MVME16x:
 289                 config_mvme16x();
 290                 break;
 291 #endif
 292 #ifdef CONFIG_BVME6000
 293         case MACH_BVME6000:
 294                 config_bvme6000();
 295                 break;
 296 #endif
 297 #ifdef CONFIG_HP300
 298         case MACH_HP300:
 299                 config_hp300();
 300                 break;
 301 #endif
 302 #ifdef CONFIG_Q40
 303         case MACH_Q40:
 304                 config_q40();
 305                 break;
 306 #endif
 307 #ifdef CONFIG_SUN3X
 308         case MACH_SUN3X:
 309                 config_sun3x();
 310                 break;
 311 #endif
 312 #ifdef CONFIG_COLDFIRE
 313         case MACH_M54XX:
 314         case MACH_M5441X:
 315                 cf_bootmem_alloc();
 316                 cf_mmu_context_init();
 317                 config_BSP(NULL, 0);
 318                 break;
 319 #endif
 320 #ifdef CONFIG_VIRT
 321         case MACH_VIRT:
 322                 config_virt();
 323                 break;
 324 #endif
 325         default:
 326                 panic("No configuration setup");
 327         }
 328
 329 #ifdef CONFIG_BLK_DEV_INITRD
 330         if (m68k_ramdisk.size) {
 331                 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
 332                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 333                 initrd_end = initrd_start + m68k_ramdisk.size;
 334                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 335         }
 336 #endif
 337
 338         paging_init();
 339
 340 #ifdef CONFIG_NATFEAT
 341         nf_init();
 342 #endif
 343
 344 #ifdef CONFIG_ATARI
 345         if (MACH_IS_ATARI)
 346                 atari_stram_reserve_pages((void *)availmem);
 347 #endif
 348 #ifdef CONFIG_SUN3X
 349         if (MACH_IS_SUN3X) {
 350                 dvma_init();
 351         }
 352 #endif
 353
 354 /* set ISA defs early as possible */
 355 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 356         if (MACH_IS_Q40) {
 357                 isa_type = ISA_TYPE_Q40;
 358                 isa_sex = 0;
 359         }
 360 #ifdef CONFIG_AMIGA_PCMCIA
 361         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 362                 isa_type = ISA_TYPE_AG;
 363                 isa_sex = 1;
 364         }
 365 #endif
 366 #ifdef CONFIG_ATARI_ROM_ISA
 367         if (MACH_IS_ATARI) {
 368                 isa_type = ISA_TYPE_ENEC;
 369                 isa_sex = 0;
 370         }
 371 #endif
 372 #endif
 373 }
 374
 375 static int show_cpuinfo(struct seq_file *m, void *v)
 376 {
 377         const char *cpu, *mmu, *fpu;
 378         unsigned long clockfreq, clockfactor;
 379
 380 #define LOOP_CYCLES_68020       (8)
 381 #define LOOP_CYCLES_68030       (8)
 382 #define LOOP_CYCLES_68040       (3)
 383 #define LOOP_CYCLES_68060       (1)
 384 #define LOOP_CYCLES_COLDFIRE    (2)
 385
 386         if (CPU_IS_020) {
 387                 cpu = "68020";
 388                 clockfactor = LOOP_CYCLES_68020;
 389         } else if (CPU_IS_030) {
 390                 cpu = "68030";
 391                 clockfactor = LOOP_CYCLES_68030;
 392         } else if (CPU_IS_040) {
 393                 cpu = "68040";
 394                 clockfactor = LOOP_CYCLES_68040;
 395         } else if (CPU_IS_060) {
 396                 cpu = "68060";
 397                 clockfactor = LOOP_CYCLES_68060;
 398         } else if (CPU_IS_COLDFIRE) {
 399                 cpu = "ColdFire";
 400                 clockfactor = LOOP_CYCLES_COLDFIRE;
 401         } else {
 402                 cpu = "680x0";
 403                 clockfactor = 0;
 404         }
 405
 406 #ifdef CONFIG_M68KFPU_EMU_ONLY
 407         fpu = "none(soft float)";
 408 #else
 409         if (m68k_fputype & FPU_68881)
 410                 fpu = "68881";
 411         else if (m68k_fputype & FPU_68882)
 412                 fpu = "68882";
 413         else if (m68k_fputype & FPU_68040)
 414                 fpu = "68040";
 415         else if (m68k_fputype & FPU_68060)
 416                 fpu = "68060";
 417         else if (m68k_fputype & FPU_SUNFPA)
 418                 fpu = "Sun FPA";
 419         else if (m68k_fputype & FPU_COLDFIRE)
 420                 fpu = "ColdFire";
 421         else
 422                 fpu = "none";
 423 #endif
 424
 425         if (m68k_mmutype & MMU_68851)
 426                 mmu = "68851";
 427         else if (m68k_mmutype & MMU_68030)
 428                 mmu = "68030";
 429         else if (m68k_mmutype & MMU_68040)
 430                 mmu = "68040";
 431         else if (m68k_mmutype & MMU_68060)
 432                 mmu = "68060";
 433         else if (m68k_mmutype & MMU_SUN3)
 434                 mmu = "Sun-3";
 435         else if (m68k_mmutype & MMU_APOLLO)
 436                 mmu = "Apollo";
 437         else if (m68k_mmutype & MMU_COLDFIRE)
 438                 mmu = "ColdFire";
 439         else
 440                 mmu = "unknown";
 441
 442         clockfreq = loops_per_jiffy * HZ * clockfactor;
 443
 444         seq_printf(m, "CPU:\t\t%s\n"
 445                    "MMU:\t\t%s\n"
 446                    "FPU:\t\t%s\n"
 447                    "Clocking:\t%lu.%1luMHz\n"
 448                    "BogoMips:\t%lu.%02lu\n"
 449                    "Calibration:\t%lu loops\n",
 450                    cpu, mmu, fpu,
 451                    clockfreq/1000000,(clockfreq/100000)%10,
 452                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 453                    loops_per_jiffy);
 454         return 0;
 455 }
 456
 457 static void *c_start(struct seq_file *m, loff_t *pos)
 458 {
 459         return *pos < 1 ? (void *)1 : NULL;
 460 }
 461 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 462 {
 463         ++*pos;
 464         return NULL;
 465 }
 466 static void c_stop(struct seq_file *m, void *v)
 467 {
 468 }
 469 const struct seq_operations cpuinfo_op = {
 470         .start  = c_start,
 471         .next   = c_next,
 472         .stop   = c_stop,
 473         .show   = show_cpuinfo,
 474 };
 475
 476 #ifdef CONFIG_PROC_HARDWARE
 477 static int hardware_proc_show(struct seq_file *m, void *v)
 478 {
 479         char model[80];
 480         unsigned long mem;
 481         int i;
 482
 483         if (mach_get_model)
 484                 mach_get_model(model);
 485         else
 486                 strcpy(model, "Unknown m68k");
 487
 488         seq_printf(m, "Model:\t\t%s\n", model);
 489         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 490                 mem += m68k_memory[i].size;
 491         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 492
 493         if (mach_get_hardware_list)
 494                 mach_get_hardware_list(m);
 495
 496         return 0;
 497 }
 498
 499 static int __init proc_hardware_init(void)
 500 {
 501         proc_create_single("hardware", 0, NULL, hardware_proc_show);
 502         return 0;
 503 }
 504 module_init(proc_hardware_init);
 505 #endif
 506
 507 void check_bugs(void)
 508 {
 509 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 510         if (m68k_fputype == 0) {
 511                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 512                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 513                 pr_emerg("Upgrade your hardware or join the FPU "
 514                         "emulation project\n");
 515                 panic("no FPU");
 516         }
 517 #endif /* !CONFIG_M68KFPU_EMU */
 518 }
 519
 520 #ifdef CONFIG_ADB
 521 static int __init adb_probe_sync_enable (char *str) {
 522         extern int __adb_probe_sync;
 523         __adb_probe_sync = 1;
 524         return 1;
 525 }
 526
 527 __setup("adb_sync", adb_probe_sync_enable);
 528 #endif /* CONFIG_ADB */
 529
 530 #if IS_ENABLED(CONFIG_NVRAM)
 531 #ifdef CONFIG_MAC
 532 static unsigned char m68k_nvram_read_byte(int addr)
 533 {
 534         if (MACH_IS_MAC)
 535                 return mac_pram_read_byte(addr);
 536         return 0xff;
 537 }
 538
 539 static void m68k_nvram_write_byte(unsigned char val, int addr)
 540 {
 541         if (MACH_IS_MAC)
 542                 mac_pram_write_byte(val, addr);
 543 }
 544 #endif /* CONFIG_MAC */
 545
 546 #ifdef CONFIG_ATARI
 547 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
 548 {
 549         if (MACH_IS_ATARI)
 550                 return atari_nvram_read(buf, count, ppos);
 551         else if (MACH_IS_MAC)
 552                 return nvram_read_bytes(buf, count, ppos);
 553         return -EINVAL;
 554 }
 555
 556 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
 557 {
 558         if (MACH_IS_ATARI)
 559                 return atari_nvram_write(buf, count, ppos);
 560         else if (MACH_IS_MAC)
 561                 return nvram_write_bytes(buf, count, ppos);
 562         return -EINVAL;
 563 }
 564
 565 static long m68k_nvram_set_checksum(void)
 566 {
 567         if (MACH_IS_ATARI)
 568                 return atari_nvram_set_checksum();
 569         return -EINVAL;
 570 }
 571
 572 static long m68k_nvram_initialize(void)
 573 {
 574         if (MACH_IS_ATARI)
 575                 return atari_nvram_initialize();
 576         return -EINVAL;
 577 }
 578 #endif /* CONFIG_ATARI */
 579
 580 static ssize_t m68k_nvram_get_size(void)
 581 {
 582         if (MACH_IS_ATARI)
 583                 return atari_nvram_get_size();
 584         else if (MACH_IS_MAC)
 585                 return mac_pram_get_size();
 586         return -ENODEV;
 587 }
 588
 589 /* Atari device drivers call .read (to get checksum validation) whereas
 590  * Mac and PowerMac device drivers just use .read_byte.
 591  */
 592 const struct nvram_ops arch_nvram_ops = {
 593 #ifdef CONFIG_MAC
 594         .read_byte      = m68k_nvram_read_byte,
 595         .write_byte     = m68k_nvram_write_byte,
 596 #endif
 597 #ifdef CONFIG_ATARI
 598         .read           = m68k_nvram_read,
 599         .write          = m68k_nvram_write,
 600         .set_checksum   = m68k_nvram_set_checksum,
 601         .initialize     = m68k_nvram_initialize,
 602 #endif
 603         .get_size       = m68k_nvram_get_size,
 604 };
 605 EXPORT_SYMBOL(arch_nvram_ops);
 606 #endif /* CONFIG_NVRAM */