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/genhd.h>
  21 #include <linux/errno.h>
  22 #include <linux/string.h>
  23 #include <linux/init.h>
  24 #include <linux/memblock.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/module.h>
  28 #include <linux/nvram.h>
  29 #include <linux/initrd.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
  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) (irq_handler_t handler) __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 /* machine dependent timer functions */
  92 int (*mach_hwclk) (int, struct rtc_time*);
  93 EXPORT_SYMBOL(mach_hwclk);
  94 unsigned int (*mach_get_ss)(void);
  95 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
  96 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
  97 EXPORT_SYMBOL(mach_get_ss);
  98 EXPORT_SYMBOL(mach_get_rtc_pll);
  99 EXPORT_SYMBOL(mach_set_rtc_pll);
 100 void (*mach_reset)( void );
 101 void (*mach_halt)( void );
 102 void (*mach_power_off)( void );
 103 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
 104 #ifdef CONFIG_HEARTBEAT
 105 void (*mach_heartbeat) (int);
 106 EXPORT_SYMBOL(mach_heartbeat);
 107 #endif
 108 #ifdef CONFIG_M68K_L2_CACHE
 109 void (*mach_l2_flush) (int);
 110 #endif
 111 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 112 int isa_type;
 113 int isa_sex;
 114 EXPORT_SYMBOL(isa_type);
 115 EXPORT_SYMBOL(isa_sex);
 116 #endif
 117
 118 extern int amiga_parse_bootinfo(const struct bi_record *);
 119 extern int atari_parse_bootinfo(const struct bi_record *);
 120 extern int mac_parse_bootinfo(const struct bi_record *);
 121 extern int q40_parse_bootinfo(const struct bi_record *);
 122 extern int bvme6000_parse_bootinfo(const struct bi_record *);
 123 extern int mvme16x_parse_bootinfo(const struct bi_record *);
 124 extern int mvme147_parse_bootinfo(const struct bi_record *);
 125 extern int hp300_parse_bootinfo(const struct bi_record *);
 126 extern int apollo_parse_bootinfo(const struct bi_record *);
 127
 128 extern void config_amiga(void);
 129 extern void config_atari(void);
 130 extern void config_mac(void);
 131 extern void config_sun3(void);
 132 extern void config_apollo(void);
 133 extern void config_mvme147(void);
 134 extern void config_mvme16x(void);
 135 extern void config_bvme6000(void);
 136 extern void config_hp300(void);
 137 extern void config_q40(void);
 138 extern void config_sun3x(void);
 139
 140 #define MASK_256K 0xfffc0000
 141
 142 extern void paging_init(void);
 143
 144 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 145 {
 146         uint16_t tag;
 147
 148         save_bootinfo(record);
 149
 150         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
 151                 int unknown = 0;
 152                 const void *data = record->data;
 153                 uint16_t size = be16_to_cpu(record->size);
 154
 155                 switch (tag) {
 156                 case BI_MACHTYPE:
 157                 case BI_CPUTYPE:
 158                 case BI_FPUTYPE:
 159                 case BI_MMUTYPE:
 160                         /* Already set up by head.S */
 161                         break;
 162
 163                 case BI_MEMCHUNK:
 164                         if (m68k_num_memory < NUM_MEMINFO) {
 165                                 const struct mem_info *m = data;
 166                                 m68k_memory[m68k_num_memory].addr =
 167                                         be32_to_cpu(m->addr);
 168                                 m68k_memory[m68k_num_memory].size =
 169                                         be32_to_cpu(m->size);
 170                                 m68k_num_memory++;
 171                         } else
 172                                 pr_warn("%s: too many memory chunks\n",
 173                                         __func__);
 174                         break;
 175
 176                 case BI_RAMDISK:
 177                         {
 178                                 const struct mem_info *m = data;
 179                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
 180                                 m68k_ramdisk.size = be32_to_cpu(m->size);
 181                         }
 182                         break;
 183
 184                 case BI_COMMAND_LINE:
 185                         strlcpy(m68k_command_line, data,
 186                                 sizeof(m68k_command_line));
 187                         break;
 188
 189                 default:
 190                         if (MACH_IS_AMIGA)
 191                                 unknown = amiga_parse_bootinfo(record);
 192                         else if (MACH_IS_ATARI)
 193                                 unknown = atari_parse_bootinfo(record);
 194                         else if (MACH_IS_MAC)
 195                                 unknown = mac_parse_bootinfo(record);
 196                         else if (MACH_IS_Q40)
 197                                 unknown = q40_parse_bootinfo(record);
 198                         else if (MACH_IS_BVME6000)
 199                                 unknown = bvme6000_parse_bootinfo(record);
 200                         else if (MACH_IS_MVME16x)
 201                                 unknown = mvme16x_parse_bootinfo(record);
 202                         else if (MACH_IS_MVME147)
 203                                 unknown = mvme147_parse_bootinfo(record);
 204                         else if (MACH_IS_HP300)
 205                                 unknown = hp300_parse_bootinfo(record);
 206                         else if (MACH_IS_APOLLO)
 207                                 unknown = apollo_parse_bootinfo(record);
 208                         else
 209                                 unknown = 1;
 210                 }
 211                 if (unknown)
 212                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 213                                 tag);
 214                 record = (struct bi_record *)((unsigned long)record + size);
 215         }
 216
 217         m68k_realnum_memory = m68k_num_memory;
 218 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 219         if (m68k_num_memory > 1) {
 220                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 221                         __func__, (m68k_num_memory - 1));
 222                 m68k_num_memory = 1;
 223         }
 224 #endif
 225 }
 226
 227 void __init setup_arch(char **cmdline_p)
 228 {
 229         /* The bootinfo is located right after the kernel */
 230         if (!CPU_IS_COLDFIRE)
 231                 m68k_parse_bootinfo((const struct bi_record *)_end);
 232
 233         if (CPU_IS_040)
 234                 m68k_is040or060 = 4;
 235         else if (CPU_IS_060)
 236                 m68k_is040or060 = 6;
 237
 238         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 239          * be confused by software FPU emulation. BEWARE.
 240          * We should really do our own FPU check at startup.
 241          * [what do we do with buggy 68LC040s? if we have problems
 242          *  with them, we should add a test to check_bugs() below] */
 243 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 244         /* clear the fpu if we have one */
 245         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 246                 volatile int zero = 0;
 247                 asm volatile ("frestore %0" : : "m" (zero));
 248         }
 249 #endif
 250
 251         if (CPU_IS_060) {
 252                 u32 pcr;
 253
 254                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 255                      : "=d" (pcr));
 256                 if (((pcr >> 8) & 0xff) <= 5) {
 257                         pr_warn("Enabling workaround for errata I14\n");
 258                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 259                              : : "d" (pcr | 0x20));
 260                 }
 261         }
 262
 263         init_mm.start_code = PAGE_OFFSET;
 264         init_mm.end_code = (unsigned long)_etext;
 265         init_mm.end_data = (unsigned long)_edata;
 266         init_mm.brk = (unsigned long)_end;
 267
 268 #if defined(CONFIG_BOOTPARAM)
 269         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 270         m68k_command_line[CL_SIZE - 1] = 0;
 271 #endif /* CONFIG_BOOTPARAM */
 272         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 273         *cmdline_p = m68k_command_line;
 274         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 275
 276         parse_early_param();
 277
 278 #ifdef CONFIG_DUMMY_CONSOLE
 279         conswitchp = &dummy_con;
 280 #endif
 281
 282         switch (m68k_machtype) {
 283 #ifdef CONFIG_AMIGA
 284         case MACH_AMIGA:
 285                 config_amiga();
 286                 break;
 287 #endif
 288 #ifdef CONFIG_ATARI
 289         case MACH_ATARI:
 290                 config_atari();
 291                 break;
 292 #endif
 293 #ifdef CONFIG_MAC
 294         case MACH_MAC:
 295                 config_mac();
 296                 break;
 297 #endif
 298 #ifdef CONFIG_SUN3
 299         case MACH_SUN3:
 300                 config_sun3();
 301                 break;
 302 #endif
 303 #ifdef CONFIG_APOLLO
 304         case MACH_APOLLO:
 305                 config_apollo();
 306                 break;
 307 #endif
 308 #ifdef CONFIG_MVME147
 309         case MACH_MVME147:
 310                 config_mvme147();
 311                 break;
 312 #endif
 313 #ifdef CONFIG_MVME16x
 314         case MACH_MVME16x:
 315                 config_mvme16x();
 316                 break;
 317 #endif
 318 #ifdef CONFIG_BVME6000
 319         case MACH_BVME6000:
 320                 config_bvme6000();
 321                 break;
 322 #endif
 323 #ifdef CONFIG_HP300
 324         case MACH_HP300:
 325                 config_hp300();
 326                 break;
 327 #endif
 328 #ifdef CONFIG_Q40
 329         case MACH_Q40:
 330                 config_q40();
 331                 break;
 332 #endif
 333 #ifdef CONFIG_SUN3X
 334         case MACH_SUN3X:
 335                 config_sun3x();
 336                 break;
 337 #endif
 338 #ifdef CONFIG_COLDFIRE
 339         case MACH_M54XX:
 340         case MACH_M5441X:
 341                 cf_bootmem_alloc();
 342                 cf_mmu_context_init();
 343                 config_BSP(NULL, 0);
 344                 break;
 345 #endif
 346         default:
 347                 panic("No configuration setup");
 348         }
 349
 350         paging_init();
 351
 352 #ifdef CONFIG_NATFEAT
 353         nf_init();
 354 #endif
 355
 356 #ifndef CONFIG_SUN3
 357 #ifdef CONFIG_BLK_DEV_INITRD
 358         if (m68k_ramdisk.size) {
 359                 memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
 360                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 361                 initrd_end = initrd_start + m68k_ramdisk.size;
 362                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 363         }
 364 #endif
 365
 366 #ifdef CONFIG_ATARI
 367         if (MACH_IS_ATARI)
 368                 atari_stram_reserve_pages((void *)availmem);
 369 #endif
 370 #ifdef CONFIG_SUN3X
 371         if (MACH_IS_SUN3X) {
 372                 dvma_init();
 373         }
 374 #endif
 375
 376 #endif /* !CONFIG_SUN3 */
 377
 378 /* set ISA defs early as possible */
 379 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 380         if (MACH_IS_Q40) {
 381                 isa_type = ISA_TYPE_Q40;
 382                 isa_sex = 0;
 383         }
 384 #ifdef CONFIG_AMIGA_PCMCIA
 385         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 386                 isa_type = ISA_TYPE_AG;
 387                 isa_sex = 1;
 388         }
 389 #endif
 390 #ifdef CONFIG_ATARI_ROM_ISA
 391         if (MACH_IS_ATARI) {
 392                 isa_type = ISA_TYPE_ENEC;
 393                 isa_sex = 0;
 394         }
 395 #endif
 396 #endif
 397 }
 398
 399 static int show_cpuinfo(struct seq_file *m, void *v)
 400 {
 401         const char *cpu, *mmu, *fpu;
 402         unsigned long clockfreq, clockfactor;
 403
 404 #define LOOP_CYCLES_68020       (8)
 405 #define LOOP_CYCLES_68030       (8)
 406 #define LOOP_CYCLES_68040       (3)
 407 #define LOOP_CYCLES_68060       (1)
 408 #define LOOP_CYCLES_COLDFIRE    (2)
 409
 410         if (CPU_IS_020) {
 411                 cpu = "68020";
 412                 clockfactor = LOOP_CYCLES_68020;
 413         } else if (CPU_IS_030) {
 414                 cpu = "68030";
 415                 clockfactor = LOOP_CYCLES_68030;
 416         } else if (CPU_IS_040) {
 417                 cpu = "68040";
 418                 clockfactor = LOOP_CYCLES_68040;
 419         } else if (CPU_IS_060) {
 420                 cpu = "68060";
 421                 clockfactor = LOOP_CYCLES_68060;
 422         } else if (CPU_IS_COLDFIRE) {
 423                 cpu = "ColdFire";
 424                 clockfactor = LOOP_CYCLES_COLDFIRE;
 425         } else {
 426                 cpu = "680x0";
 427                 clockfactor = 0;
 428         }
 429
 430 #ifdef CONFIG_M68KFPU_EMU_ONLY
 431         fpu = "none(soft float)";
 432 #else
 433         if (m68k_fputype & FPU_68881)
 434                 fpu = "68881";
 435         else if (m68k_fputype & FPU_68882)
 436                 fpu = "68882";
 437         else if (m68k_fputype & FPU_68040)
 438                 fpu = "68040";
 439         else if (m68k_fputype & FPU_68060)
 440                 fpu = "68060";
 441         else if (m68k_fputype & FPU_SUNFPA)
 442                 fpu = "Sun FPA";
 443         else if (m68k_fputype & FPU_COLDFIRE)
 444                 fpu = "ColdFire";
 445         else
 446                 fpu = "none";
 447 #endif
 448
 449         if (m68k_mmutype & MMU_68851)
 450                 mmu = "68851";
 451         else if (m68k_mmutype & MMU_68030)
 452                 mmu = "68030";
 453         else if (m68k_mmutype & MMU_68040)
 454                 mmu = "68040";
 455         else if (m68k_mmutype & MMU_68060)
 456                 mmu = "68060";
 457         else if (m68k_mmutype & MMU_SUN3)
 458                 mmu = "Sun-3";
 459         else if (m68k_mmutype & MMU_APOLLO)
 460                 mmu = "Apollo";
 461         else if (m68k_mmutype & MMU_COLDFIRE)
 462                 mmu = "ColdFire";
 463         else
 464                 mmu = "unknown";
 465
 466         clockfreq = loops_per_jiffy * HZ * clockfactor;
 467
 468         seq_printf(m, "CPU:\t\t%s\n"
 469                    "MMU:\t\t%s\n"
 470                    "FPU:\t\t%s\n"
 471                    "Clocking:\t%lu.%1luMHz\n"
 472                    "BogoMips:\t%lu.%02lu\n"
 473                    "Calibration:\t%lu loops\n",
 474                    cpu, mmu, fpu,
 475                    clockfreq/1000000,(clockfreq/100000)%10,
 476                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 477                    loops_per_jiffy);
 478         return 0;
 479 }
 480
 481 static void *c_start(struct seq_file *m, loff_t *pos)
 482 {
 483         return *pos < 1 ? (void *)1 : NULL;
 484 }
 485 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 486 {
 487         ++*pos;
 488         return NULL;
 489 }
 490 static void c_stop(struct seq_file *m, void *v)
 491 {
 492 }
 493 const struct seq_operations cpuinfo_op = {
 494         .start  = c_start,
 495         .next   = c_next,
 496         .stop   = c_stop,
 497         .show   = show_cpuinfo,
 498 };
 499
 500 #ifdef CONFIG_PROC_HARDWARE
 501 static int hardware_proc_show(struct seq_file *m, void *v)
 502 {
 503         char model[80];
 504         unsigned long mem;
 505         int i;
 506
 507         if (mach_get_model)
 508                 mach_get_model(model);
 509         else
 510                 strcpy(model, "Unknown m68k");
 511
 512         seq_printf(m, "Model:\t\t%s\n", model);
 513         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 514                 mem += m68k_memory[i].size;
 515         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 516
 517         if (mach_get_hardware_list)
 518                 mach_get_hardware_list(m);
 519
 520         return 0;
 521 }
 522
 523 static int __init proc_hardware_init(void)
 524 {
 525         proc_create_single("hardware", 0, NULL, hardware_proc_show);
 526         return 0;
 527 }
 528 module_init(proc_hardware_init);
 529 #endif
 530
 531 void __init arch_cpu_finalize_init(void)
 532 {
 533 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 534         if (m68k_fputype == 0) {
 535                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 536                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 537                 pr_emerg("Upgrade your hardware or join the FPU "
 538                         "emulation project\n");
 539                 panic("no FPU");
 540         }
 541 #endif /* !CONFIG_M68KFPU_EMU */
 542 }
 543
 544 #ifdef CONFIG_ADB
 545 static int __init adb_probe_sync_enable (char *str) {
 546         extern int __adb_probe_sync;
 547         __adb_probe_sync = 1;
 548         return 1;
 549 }
 550
 551 __setup("adb_sync", adb_probe_sync_enable);
 552 #endif /* CONFIG_ADB */
 553
 554 #if IS_ENABLED(CONFIG_NVRAM)
 555 #ifdef CONFIG_MAC
 556 static unsigned char m68k_nvram_read_byte(int addr)
 557 {
 558         if (MACH_IS_MAC)
 559                 return mac_pram_read_byte(addr);
 560         return 0xff;
 561 }
 562
 563 static void m68k_nvram_write_byte(unsigned char val, int addr)
 564 {
 565         if (MACH_IS_MAC)
 566                 mac_pram_write_byte(val, addr);
 567 }
 568 #endif /* CONFIG_MAC */
 569
 570 #ifdef CONFIG_ATARI
 571 static ssize_t m68k_nvram_read(char *buf, size_t count, loff_t *ppos)
 572 {
 573         if (MACH_IS_ATARI)
 574                 return atari_nvram_read(buf, count, ppos);
 575         else if (MACH_IS_MAC)
 576                 return nvram_read_bytes(buf, count, ppos);
 577         return -EINVAL;
 578 }
 579
 580 static ssize_t m68k_nvram_write(char *buf, size_t count, loff_t *ppos)
 581 {
 582         if (MACH_IS_ATARI)
 583                 return atari_nvram_write(buf, count, ppos);
 584         else if (MACH_IS_MAC)
 585                 return nvram_write_bytes(buf, count, ppos);
 586         return -EINVAL;
 587 }
 588
 589 static long m68k_nvram_set_checksum(void)
 590 {
 591         if (MACH_IS_ATARI)
 592                 return atari_nvram_set_checksum();
 593         return -EINVAL;
 594 }
 595
 596 static long m68k_nvram_initialize(void)
 597 {
 598         if (MACH_IS_ATARI)
 599                 return atari_nvram_initialize();
 600         return -EINVAL;
 601 }
 602 #endif /* CONFIG_ATARI */
 603
 604 static ssize_t m68k_nvram_get_size(void)
 605 {
 606         if (MACH_IS_ATARI)
 607                 return atari_nvram_get_size();
 608         else if (MACH_IS_MAC)
 609                 return mac_pram_get_size();
 610         return -ENODEV;
 611 }
 612
 613 /* Atari device drivers call .read (to get checksum validation) whereas
 614  * Mac and PowerMac device drivers just use .read_byte.
 615  */
 616 const struct nvram_ops arch_nvram_ops = {
 617 #ifdef CONFIG_MAC
 618         .read_byte      = m68k_nvram_read_byte,
 619         .write_byte     = m68k_nvram_write_byte,
 620 #endif
 621 #ifdef CONFIG_ATARI
 622         .read           = m68k_nvram_read,
 623         .write          = m68k_nvram_write,
 624         .set_checksum   = m68k_nvram_set_checksum,
 625         .initialize     = m68k_nvram_initialize,
 626 #endif
 627         .get_size       = m68k_nvram_get_size,
 628 };
 629 EXPORT_SYMBOL(arch_nvram_ops);
 630 #endif /* CONFIG_NVRAM */