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