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