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/bootmem.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/module.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 #ifdef CONFIG_ATARI
  41 #include <asm/atarihw.h>
  42 #include <asm/atari_stram.h>
  43 #endif
  44 #ifdef CONFIG_SUN3X
  45 #include <asm/dvma.h>
  46 #endif
  47 #include <asm/natfeat.h>
  48
  49 #if !FPSTATESIZE || !NR_IRQS
  50 #warning No CPU/platform type selected, your kernel will not work!
  51 #warning Are you building an allnoconfig kernel?
  52 #endif
  53
  54 unsigned long m68k_machtype;
  55 EXPORT_SYMBOL(m68k_machtype);
  56 unsigned long m68k_cputype;
  57 EXPORT_SYMBOL(m68k_cputype);
  58 unsigned long m68k_fputype;
  59 unsigned long m68k_mmutype;
  60 EXPORT_SYMBOL(m68k_mmutype);
  61 #ifdef CONFIG_VME
  62 unsigned long vme_brdtype;
  63 EXPORT_SYMBOL(vme_brdtype);
  64 #endif
  65
  66 int m68k_is040or060;
  67 EXPORT_SYMBOL(m68k_is040or060);
  68
  69 extern unsigned long availmem;
  70
  71 int m68k_num_memory;
  72 EXPORT_SYMBOL(m68k_num_memory);
  73 int m68k_realnum_memory;
  74 EXPORT_SYMBOL(m68k_realnum_memory);
  75 unsigned long m68k_memoffset;
  76 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
  77 EXPORT_SYMBOL(m68k_memory);
  78
  79 static struct m68k_mem_info m68k_ramdisk __initdata;
  80
  81 static char m68k_command_line[CL_SIZE] __initdata;
  82
  83 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
  84 /* machine dependent irq functions */
  85 void (*mach_init_IRQ) (void) __initdata = NULL;
  86 void (*mach_get_model) (char *model);
  87 void (*mach_get_hardware_list) (struct seq_file *m);
  88 /* machine dependent timer functions */
  89 int (*mach_hwclk) (int, struct rtc_time*);
  90 EXPORT_SYMBOL(mach_hwclk);
  91 unsigned int (*mach_get_ss)(void);
  92 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
  93 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
  94 EXPORT_SYMBOL(mach_get_ss);
  95 EXPORT_SYMBOL(mach_get_rtc_pll);
  96 EXPORT_SYMBOL(mach_set_rtc_pll);
  97 void (*mach_reset)( void );
  98 void (*mach_halt)( void );
  99 void (*mach_power_off)( void );
 100 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
 101 #ifdef CONFIG_HEARTBEAT
 102 void (*mach_heartbeat) (int);
 103 EXPORT_SYMBOL(mach_heartbeat);
 104 #endif
 105 #ifdef CONFIG_M68K_L2_CACHE
 106 void (*mach_l2_flush) (int);
 107 #endif
 108 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 109 int isa_type;
 110 int isa_sex;
 111 EXPORT_SYMBOL(isa_type);
 112 EXPORT_SYMBOL(isa_sex);
 113 #endif
 114
 115 extern int amiga_parse_bootinfo(const struct bi_record *);
 116 extern int atari_parse_bootinfo(const struct bi_record *);
 117 extern int mac_parse_bootinfo(const struct bi_record *);
 118 extern int q40_parse_bootinfo(const struct bi_record *);
 119 extern int bvme6000_parse_bootinfo(const struct bi_record *);
 120 extern int mvme16x_parse_bootinfo(const struct bi_record *);
 121 extern int mvme147_parse_bootinfo(const struct bi_record *);
 122 extern int hp300_parse_bootinfo(const struct bi_record *);
 123 extern int apollo_parse_bootinfo(const struct bi_record *);
 124
 125 extern void config_amiga(void);
 126 extern void config_atari(void);
 127 extern void config_mac(void);
 128 extern void config_sun3(void);
 129 extern void config_apollo(void);
 130 extern void config_mvme147(void);
 131 extern void config_mvme16x(void);
 132 extern void config_bvme6000(void);
 133 extern void config_hp300(void);
 134 extern void config_q40(void);
 135 extern void config_sun3x(void);
 136
 137 #define MASK_256K 0xfffc0000
 138
 139 extern void paging_init(void);
 140
 141 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 142 {
 143         uint16_t tag;
 144
 145         save_bootinfo(record);
 146
 147         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
 148                 int unknown = 0;
 149                 const void *data = record->data;
 150                 uint16_t size = be16_to_cpu(record->size);
 151
 152                 switch (tag) {
 153                 case BI_MACHTYPE:
 154                 case BI_CPUTYPE:
 155                 case BI_FPUTYPE:
 156                 case BI_MMUTYPE:
 157                         /* Already set up by head.S */
 158                         break;
 159
 160                 case BI_MEMCHUNK:
 161                         if (m68k_num_memory < NUM_MEMINFO) {
 162                                 const struct mem_info *m = data;
 163                                 m68k_memory[m68k_num_memory].addr =
 164                                         be32_to_cpu(m->addr);
 165                                 m68k_memory[m68k_num_memory].size =
 166                                         be32_to_cpu(m->size);
 167                                 m68k_num_memory++;
 168                         } else
 169                                 pr_warn("%s: too many memory chunks\n",
 170                                         __func__);
 171                         break;
 172
 173                 case BI_RAMDISK:
 174                         {
 175                                 const struct mem_info *m = data;
 176                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
 177                                 m68k_ramdisk.size = be32_to_cpu(m->size);
 178                         }
 179                         break;
 180
 181                 case BI_COMMAND_LINE:
 182                         strlcpy(m68k_command_line, data,
 183                                 sizeof(m68k_command_line));
 184                         break;
 185
 186                 default:
 187                         if (MACH_IS_AMIGA)
 188                                 unknown = amiga_parse_bootinfo(record);
 189                         else if (MACH_IS_ATARI)
 190                                 unknown = atari_parse_bootinfo(record);
 191                         else if (MACH_IS_MAC)
 192                                 unknown = mac_parse_bootinfo(record);
 193                         else if (MACH_IS_Q40)
 194                                 unknown = q40_parse_bootinfo(record);
 195                         else if (MACH_IS_BVME6000)
 196                                 unknown = bvme6000_parse_bootinfo(record);
 197                         else if (MACH_IS_MVME16x)
 198                                 unknown = mvme16x_parse_bootinfo(record);
 199                         else if (MACH_IS_MVME147)
 200                                 unknown = mvme147_parse_bootinfo(record);
 201                         else if (MACH_IS_HP300)
 202                                 unknown = hp300_parse_bootinfo(record);
 203                         else if (MACH_IS_APOLLO)
 204                                 unknown = apollo_parse_bootinfo(record);
 205                         else
 206                                 unknown = 1;
 207                 }
 208                 if (unknown)
 209                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 210                                 tag);
 211                 record = (struct bi_record *)((unsigned long)record + size);
 212         }
 213
 214         m68k_realnum_memory = m68k_num_memory;
 215 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 216         if (m68k_num_memory > 1) {
 217                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 218                         __func__, (m68k_num_memory - 1));
 219                 m68k_num_memory = 1;
 220         }
 221 #endif
 222 }
 223
 224 void __init setup_arch(char **cmdline_p)
 225 {
 226 #ifndef CONFIG_SUN3
 227         int i;
 228 #endif
 229
 230         /* The bootinfo is located right after the kernel */
 231         if (!CPU_IS_COLDFIRE)
 232                 m68k_parse_bootinfo((const struct bi_record *)_end);
 233
 234         if (CPU_IS_040)
 235                 m68k_is040or060 = 4;
 236         else if (CPU_IS_060)
 237                 m68k_is040or060 = 6;
 238
 239         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 240          * be confused by software FPU emulation. BEWARE.
 241          * We should really do our own FPU check at startup.
 242          * [what do we do with buggy 68LC040s? if we have problems
 243          *  with them, we should add a test to check_bugs() below] */
 244 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 245         /* clear the fpu if we have one */
 246         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 247                 volatile int zero = 0;
 248                 asm volatile ("frestore %0" : : "m" (zero));
 249         }
 250 #endif
 251
 252         if (CPU_IS_060) {
 253                 u32 pcr;
 254
 255                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 256                      : "=d" (pcr));
 257                 if (((pcr >> 8) & 0xff) <= 5) {
 258                         pr_warn("Enabling workaround for errata I14\n");
 259                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 260                              : : "d" (pcr | 0x20));
 261                 }
 262         }
 263
 264         init_mm.start_code = PAGE_OFFSET;
 265         init_mm.end_code = (unsigned long)_etext;
 266         init_mm.end_data = (unsigned long)_edata;
 267         init_mm.brk = (unsigned long)_end;
 268
 269 #if defined(CONFIG_BOOTPARAM)
 270         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 271         m68k_command_line[CL_SIZE - 1] = 0;
 272 #endif /* CONFIG_BOOTPARAM */
 273         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 274         *cmdline_p = m68k_command_line;
 275         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 276
 277         parse_early_param();
 278
 279 #ifdef CONFIG_DUMMY_CONSOLE
 280         conswitchp = &dummy_con;
 281 #endif
 282
 283         switch (m68k_machtype) {
 284 #ifdef CONFIG_AMIGA
 285         case MACH_AMIGA:
 286                 config_amiga();
 287                 break;
 288 #endif
 289 #ifdef CONFIG_ATARI
 290         case MACH_ATARI:
 291                 config_atari();
 292                 break;
 293 #endif
 294 #ifdef CONFIG_MAC
 295         case MACH_MAC:
 296                 config_mac();
 297                 break;
 298 #endif
 299 #ifdef CONFIG_SUN3
 300         case MACH_SUN3:
 301                 config_sun3();
 302                 break;
 303 #endif
 304 #ifdef CONFIG_APOLLO
 305         case MACH_APOLLO:
 306                 config_apollo();
 307                 break;
 308 #endif
 309 #ifdef CONFIG_MVME147
 310         case MACH_MVME147:
 311                 config_mvme147();
 312                 break;
 313 #endif
 314 #ifdef CONFIG_MVME16x
 315         case MACH_MVME16x:
 316                 config_mvme16x();
 317                 break;
 318 #endif
 319 #ifdef CONFIG_BVME6000
 320         case MACH_BVME6000:
 321                 config_bvme6000();
 322                 break;
 323 #endif
 324 #ifdef CONFIG_HP300
 325         case MACH_HP300:
 326                 config_hp300();
 327                 break;
 328 #endif
 329 #ifdef CONFIG_Q40
 330         case MACH_Q40:
 331                 config_q40();
 332                 break;
 333 #endif
 334 #ifdef CONFIG_SUN3X
 335         case MACH_SUN3X:
 336                 config_sun3x();
 337                 break;
 338 #endif
 339 #ifdef CONFIG_COLDFIRE
 340         case MACH_M54XX:
 341         case MACH_M5441X:
 342                 cf_bootmem_alloc();
 343                 cf_mmu_context_init();
 344                 config_BSP(NULL, 0);
 345                 break;
 346 #endif
 347         default:
 348                 panic("No configuration setup");
 349         }
 350
 351         paging_init();
 352
 353 #ifdef CONFIG_NATFEAT
 354         nf_init();
 355 #endif
 356
 357 #ifndef CONFIG_SUN3
 358         for (i = 1; i < m68k_num_memory; i++)
 359                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
 360                                   m68k_memory[i].size);
 361 #ifdef CONFIG_BLK_DEV_INITRD
 362         if (m68k_ramdisk.size) {
 363                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
 364                                      m68k_ramdisk.addr, m68k_ramdisk.size,
 365                                      BOOTMEM_DEFAULT);
 366                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 367                 initrd_end = initrd_start + m68k_ramdisk.size;
 368                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 369         }
 370 #endif
 371
 372 #ifdef CONFIG_ATARI
 373         if (MACH_IS_ATARI)
 374                 atari_stram_reserve_pages((void *)availmem);
 375 #endif
 376 #ifdef CONFIG_SUN3X
 377         if (MACH_IS_SUN3X) {
 378                 dvma_init();
 379         }
 380 #endif
 381
 382 #endif /* !CONFIG_SUN3 */
 383
 384 /* set ISA defs early as possible */
 385 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 386         if (MACH_IS_Q40) {
 387                 isa_type = ISA_TYPE_Q40;
 388                 isa_sex = 0;
 389         }
 390 #ifdef CONFIG_AMIGA_PCMCIA
 391         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 392                 isa_type = ISA_TYPE_AG;
 393                 isa_sex = 1;
 394         }
 395 #endif
 396 #ifdef CONFIG_ATARI_ROM_ISA
 397         if (MACH_IS_ATARI) {
 398                 isa_type = ISA_TYPE_ENEC;
 399                 isa_sex = 0;
 400         }
 401 #endif
 402 #endif
 403 }
 404
 405 static int show_cpuinfo(struct seq_file *m, void *v)
 406 {
 407         const char *cpu, *mmu, *fpu;
 408         unsigned long clockfreq, clockfactor;
 409
 410 #define LOOP_CYCLES_68020       (8)
 411 #define LOOP_CYCLES_68030       (8)
 412 #define LOOP_CYCLES_68040       (3)
 413 #define LOOP_CYCLES_68060       (1)
 414 #define LOOP_CYCLES_COLDFIRE    (2)
 415
 416         if (CPU_IS_020) {
 417                 cpu = "68020";
 418                 clockfactor = LOOP_CYCLES_68020;
 419         } else if (CPU_IS_030) {
 420                 cpu = "68030";
 421                 clockfactor = LOOP_CYCLES_68030;
 422         } else if (CPU_IS_040) {
 423                 cpu = "68040";
 424                 clockfactor = LOOP_CYCLES_68040;
 425         } else if (CPU_IS_060) {
 426                 cpu = "68060";
 427                 clockfactor = LOOP_CYCLES_68060;
 428         } else if (CPU_IS_COLDFIRE) {
 429                 cpu = "ColdFire";
 430                 clockfactor = LOOP_CYCLES_COLDFIRE;
 431         } else {
 432                 cpu = "680x0";
 433                 clockfactor = 0;
 434         }
 435
 436 #ifdef CONFIG_M68KFPU_EMU_ONLY
 437         fpu = "none(soft float)";
 438 #else
 439         if (m68k_fputype & FPU_68881)
 440                 fpu = "68881";
 441         else if (m68k_fputype & FPU_68882)
 442                 fpu = "68882";
 443         else if (m68k_fputype & FPU_68040)
 444                 fpu = "68040";
 445         else if (m68k_fputype & FPU_68060)
 446                 fpu = "68060";
 447         else if (m68k_fputype & FPU_SUNFPA)
 448                 fpu = "Sun FPA";
 449         else if (m68k_fputype & FPU_COLDFIRE)
 450                 fpu = "ColdFire";
 451         else
 452                 fpu = "none";
 453 #endif
 454
 455         if (m68k_mmutype & MMU_68851)
 456                 mmu = "68851";
 457         else if (m68k_mmutype & MMU_68030)
 458                 mmu = "68030";
 459         else if (m68k_mmutype & MMU_68040)
 460                 mmu = "68040";
 461         else if (m68k_mmutype & MMU_68060)
 462                 mmu = "68060";
 463         else if (m68k_mmutype & MMU_SUN3)
 464                 mmu = "Sun-3";
 465         else if (m68k_mmutype & MMU_APOLLO)
 466                 mmu = "Apollo";
 467         else if (m68k_mmutype & MMU_COLDFIRE)
 468                 mmu = "ColdFire";
 469         else
 470                 mmu = "unknown";
 471
 472         clockfreq = loops_per_jiffy * HZ * clockfactor;
 473
 474         seq_printf(m, "CPU:\t\t%s\n"
 475                    "MMU:\t\t%s\n"
 476                    "FPU:\t\t%s\n"
 477                    "Clocking:\t%lu.%1luMHz\n"
 478                    "BogoMips:\t%lu.%02lu\n"
 479                    "Calibration:\t%lu loops\n",
 480                    cpu, mmu, fpu,
 481                    clockfreq/1000000,(clockfreq/100000)%10,
 482                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 483                    loops_per_jiffy);
 484         return 0;
 485 }
 486
 487 static void *c_start(struct seq_file *m, loff_t *pos)
 488 {
 489         return *pos < 1 ? (void *)1 : NULL;
 490 }
 491 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 492 {
 493         ++*pos;
 494         return NULL;
 495 }
 496 static void c_stop(struct seq_file *m, void *v)
 497 {
 498 }
 499 const struct seq_operations cpuinfo_op = {
 500         .start  = c_start,
 501         .next   = c_next,
 502         .stop   = c_stop,
 503         .show   = show_cpuinfo,
 504 };
 505
 506 #ifdef CONFIG_PROC_HARDWARE
 507 static int hardware_proc_show(struct seq_file *m, void *v)
 508 {
 509         char model[80];
 510         unsigned long mem;
 511         int i;
 512
 513         if (mach_get_model)
 514                 mach_get_model(model);
 515         else
 516                 strcpy(model, "Unknown m68k");
 517
 518         seq_printf(m, "Model:\t\t%s\n", model);
 519         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 520                 mem += m68k_memory[i].size;
 521         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 522
 523         if (mach_get_hardware_list)
 524                 mach_get_hardware_list(m);
 525
 526         return 0;
 527 }
 528
 529 static int __init proc_hardware_init(void)
 530 {
 531         proc_create_single("hardware", 0, NULL, hardware_proc_show);
 532         return 0;
 533 }
 534 module_init(proc_hardware_init);
 535 #endif
 536
 537 void check_bugs(void)
 538 {
 539 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 540         if (m68k_fputype == 0) {
 541                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 542                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 543                 pr_emerg("Upgrade your hardware or join the FPU "
 544                         "emulation project\n");
 545                 panic("no FPU");
 546         }
 547 #endif /* !CONFIG_M68KFPU_EMU */
 548 }
 549
 550 #ifdef CONFIG_ADB
 551 static int __init adb_probe_sync_enable (char *str) {
 552         extern int __adb_probe_sync;
 553         __adb_probe_sync = 1;
 554         return 1;
 555 }
 556
 557 __setup("adb_sync", adb_probe_sync_enable);
 558 #endif /* CONFIG_ADB */