arch/m68k/kernel/setup_mm.c

   1 /*
   2  *  linux/arch/m68k/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995  Hamish Macdonald
   5  */
   6
   7 /*
   8  * This file handles the architecture-dependent parts of system setup
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/sched.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/fs.h>
  17 #include <linux/console.h>
  18 #include <linux/genhd.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/init.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/module.h>
  26 #include <linux/initrd.h>
  27
  28 #include <asm/bootinfo.h>
  29 #include <asm/byteorder.h>
  30 #include <asm/sections.h>
  31 #include <asm/setup.h>
  32 #include <asm/fpu.h>
  33 #include <asm/irq.h>
  34 #include <asm/io.h>
  35 #include <asm/machdep.h>
  36 #ifdef CONFIG_AMIGA
  37 #include <asm/amigahw.h>
  38 #endif
  39 #ifdef CONFIG_ATARI
  40 #include <asm/atarihw.h>
  41 #include <asm/atari_stram.h>
  42 #endif
  43 #ifdef CONFIG_SUN3X
  44 #include <asm/dvma.h>
  45 #endif
  46 #include <asm/natfeat.h>
  47
  48 #if !FPSTATESIZE || !NR_IRQS
  49 #warning No CPU/platform type selected, your kernel will not work!
  50 #warning Are you building an allnoconfig kernel?
  51 #endif
  52
  53 unsigned long m68k_machtype;
  54 EXPORT_SYMBOL(m68k_machtype);
  55 unsigned long m68k_cputype;
  56 EXPORT_SYMBOL(m68k_cputype);
  57 unsigned long m68k_fputype;
  58 unsigned long m68k_mmutype;
  59 EXPORT_SYMBOL(m68k_mmutype);
  60 #ifdef CONFIG_VME
  61 unsigned long vme_brdtype;
  62 EXPORT_SYMBOL(vme_brdtype);
  63 #endif
  64
  65 int m68k_is040or060;
  66 EXPORT_SYMBOL(m68k_is040or060);
  67
  68 extern unsigned long availmem;
  69
  70 int m68k_num_memory;
  71 EXPORT_SYMBOL(m68k_num_memory);
  72 int m68k_realnum_memory;
  73 EXPORT_SYMBOL(m68k_realnum_memory);
  74 unsigned long m68k_memoffset;
  75 struct m68k_mem_info m68k_memory[NUM_MEMINFO];
  76 EXPORT_SYMBOL(m68k_memory);
  77
  78 static struct m68k_mem_info m68k_ramdisk __initdata;
  79
  80 static char m68k_command_line[CL_SIZE] __initdata;
  81
  82 void (*mach_sched_init) (irq_handler_t handler) __initdata = NULL;
  83 /* machine dependent irq functions */
  84 void (*mach_init_IRQ) (void) __initdata = NULL;
  85 void (*mach_get_model) (char *model);
  86 void (*mach_get_hardware_list) (struct seq_file *m);
  87 /* machine dependent timer functions */
  88 int (*mach_hwclk) (int, struct rtc_time*);
  89 EXPORT_SYMBOL(mach_hwclk);
  90 int (*mach_set_clock_mmss) (unsigned long);
  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 IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
 109 void (*mach_beep)(unsigned int, unsigned int);
 110 EXPORT_SYMBOL(mach_beep);
 111 #endif
 112 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 113 int isa_type;
 114 int isa_sex;
 115 EXPORT_SYMBOL(isa_type);
 116 EXPORT_SYMBOL(isa_sex);
 117 #endif
 118
 119 extern int amiga_parse_bootinfo(const struct bi_record *);
 120 extern int atari_parse_bootinfo(const struct bi_record *);
 121 extern int mac_parse_bootinfo(const struct bi_record *);
 122 extern int q40_parse_bootinfo(const struct bi_record *);
 123 extern int bvme6000_parse_bootinfo(const struct bi_record *);
 124 extern int mvme16x_parse_bootinfo(const struct bi_record *);
 125 extern int mvme147_parse_bootinfo(const struct bi_record *);
 126 extern int hp300_parse_bootinfo(const struct bi_record *);
 127 extern int apollo_parse_bootinfo(const struct bi_record *);
 128
 129 extern void config_amiga(void);
 130 extern void config_atari(void);
 131 extern void config_mac(void);
 132 extern void config_sun3(void);
 133 extern void config_apollo(void);
 134 extern void config_mvme147(void);
 135 extern void config_mvme16x(void);
 136 extern void config_bvme6000(void);
 137 extern void config_hp300(void);
 138 extern void config_q40(void);
 139 extern void config_sun3x(void);
 140
 141 #define MASK_256K 0xfffc0000
 142
 143 extern void paging_init(void);
 144
 145 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 146 {
 147         uint16_t tag;
 148
 149         save_bootinfo(record);
 150
 151         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
 152                 int unknown = 0;
 153                 const void *data = record->data;
 154                 uint16_t size = be16_to_cpu(record->size);
 155
 156                 switch (tag) {
 157                 case BI_MACHTYPE:
 158                 case BI_CPUTYPE:
 159                 case BI_FPUTYPE:
 160                 case BI_MMUTYPE:
 161                         /* Already set up by head.S */
 162                         break;
 163
 164                 case BI_MEMCHUNK:
 165                         if (m68k_num_memory < NUM_MEMINFO) {
 166                                 const struct mem_info *m = data;
 167                                 m68k_memory[m68k_num_memory].addr =
 168                                         be32_to_cpu(m->addr);
 169                                 m68k_memory[m68k_num_memory].size =
 170                                         be32_to_cpu(m->size);
 171                                 m68k_num_memory++;
 172                         } else
 173                                 pr_warn("%s: too many memory chunks\n",
 174                                         __func__);
 175                         break;
 176
 177                 case BI_RAMDISK:
 178                         {
 179                                 const struct mem_info *m = data;
 180                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
 181                                 m68k_ramdisk.size = be32_to_cpu(m->size);
 182                         }
 183                         break;
 184
 185                 case BI_COMMAND_LINE:
 186                         strlcpy(m68k_command_line, data,
 187                                 sizeof(m68k_command_line));
 188                         break;
 189
 190                 default:
 191                         if (MACH_IS_AMIGA)
 192                                 unknown = amiga_parse_bootinfo(record);
 193                         else if (MACH_IS_ATARI)
 194                                 unknown = atari_parse_bootinfo(record);
 195                         else if (MACH_IS_MAC)
 196                                 unknown = mac_parse_bootinfo(record);
 197                         else if (MACH_IS_Q40)
 198                                 unknown = q40_parse_bootinfo(record);
 199                         else if (MACH_IS_BVME6000)
 200                                 unknown = bvme6000_parse_bootinfo(record);
 201                         else if (MACH_IS_MVME16x)
 202                                 unknown = mvme16x_parse_bootinfo(record);
 203                         else if (MACH_IS_MVME147)
 204                                 unknown = mvme147_parse_bootinfo(record);
 205                         else if (MACH_IS_HP300)
 206                                 unknown = hp300_parse_bootinfo(record);
 207                         else if (MACH_IS_APOLLO)
 208                                 unknown = apollo_parse_bootinfo(record);
 209                         else
 210                                 unknown = 1;
 211                 }
 212                 if (unknown)
 213                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 214                                 tag);
 215                 record = (struct bi_record *)((unsigned long)record + size);
 216         }
 217
 218         m68k_realnum_memory = m68k_num_memory;
 219 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 220         if (m68k_num_memory > 1) {
 221                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 222                         __func__, (m68k_num_memory - 1));
 223                 m68k_num_memory = 1;
 224         }
 225 #endif
 226 }
 227
 228 void __init setup_arch(char **cmdline_p)
 229 {
 230 #ifndef CONFIG_SUN3
 231         int i;
 232 #endif
 233
 234         /* The bootinfo is located right after the kernel */
 235         if (!CPU_IS_COLDFIRE)
 236                 m68k_parse_bootinfo((const struct bi_record *)_end);
 237
 238         if (CPU_IS_040)
 239                 m68k_is040or060 = 4;
 240         else if (CPU_IS_060)
 241                 m68k_is040or060 = 6;
 242
 243         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 244          * be confused by software FPU emulation. BEWARE.
 245          * We should really do our own FPU check at startup.
 246          * [what do we do with buggy 68LC040s? if we have problems
 247          *  with them, we should add a test to check_bugs() below] */
 248 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 249         /* clear the fpu if we have one */
 250         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 251                 volatile int zero = 0;
 252                 asm volatile ("frestore %0" : : "m" (zero));
 253         }
 254 #endif
 255
 256         if (CPU_IS_060) {
 257                 u32 pcr;
 258
 259                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 260                      : "=d" (pcr));
 261                 if (((pcr >> 8) & 0xff) <= 5) {
 262                         pr_warn("Enabling workaround for errata I14\n");
 263                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 264                              : : "d" (pcr | 0x20));
 265                 }
 266         }
 267
 268         init_mm.start_code = PAGE_OFFSET;
 269         init_mm.end_code = (unsigned long)_etext;
 270         init_mm.end_data = (unsigned long)_edata;
 271         init_mm.brk = (unsigned long)_end;
 272
 273 #if defined(CONFIG_BOOTPARAM)
 274         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 275         m68k_command_line[CL_SIZE - 1] = 0;
 276 #endif /* CONFIG_BOOTPARAM */
 277         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 278         *cmdline_p = m68k_command_line;
 279         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 280
 281         parse_early_param();
 282
 283 #ifdef CONFIG_DUMMY_CONSOLE
 284         conswitchp = &dummy_con;
 285 #endif
 286
 287         switch (m68k_machtype) {
 288 #ifdef CONFIG_AMIGA
 289         case MACH_AMIGA:
 290                 config_amiga();
 291                 break;
 292 #endif
 293 #ifdef CONFIG_ATARI
 294         case MACH_ATARI:
 295                 config_atari();
 296                 break;
 297 #endif
 298 #ifdef CONFIG_MAC
 299         case MACH_MAC:
 300                 config_mac();
 301                 break;
 302 #endif
 303 #ifdef CONFIG_SUN3
 304         case MACH_SUN3:
 305                 config_sun3();
 306                 break;
 307 #endif
 308 #ifdef CONFIG_APOLLO
 309         case MACH_APOLLO:
 310                 config_apollo();
 311                 break;
 312 #endif
 313 #ifdef CONFIG_MVME147
 314         case MACH_MVME147:
 315                 config_mvme147();
 316                 break;
 317 #endif
 318 #ifdef CONFIG_MVME16x
 319         case MACH_MVME16x:
 320                 config_mvme16x();
 321                 break;
 322 #endif
 323 #ifdef CONFIG_BVME6000
 324         case MACH_BVME6000:
 325                 config_bvme6000();
 326                 break;
 327 #endif
 328 #ifdef CONFIG_HP300
 329         case MACH_HP300:
 330                 config_hp300();
 331                 break;
 332 #endif
 333 #ifdef CONFIG_Q40
 334         case MACH_Q40:
 335                 config_q40();
 336                 break;
 337 #endif
 338 #ifdef CONFIG_SUN3X
 339         case MACH_SUN3X:
 340                 config_sun3x();
 341                 break;
 342 #endif
 343 #ifdef CONFIG_COLDFIRE
 344         case MACH_M54XX:
 345         case MACH_M5441X:
 346                 config_BSP(NULL, 0);
 347                 break;
 348 #endif
 349         default:
 350                 panic("No configuration setup");
 351         }
 352
 353         paging_init();
 354
 355 #ifdef CONFIG_NATFEAT
 356         nf_init();
 357 #endif
 358
 359 #ifndef CONFIG_SUN3
 360         for (i = 1; i < m68k_num_memory; i++)
 361                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
 362                                   m68k_memory[i].size);
 363 #ifdef CONFIG_BLK_DEV_INITRD
 364         if (m68k_ramdisk.size) {
 365                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
 366                                      m68k_ramdisk.addr, m68k_ramdisk.size,
 367                                      BOOTMEM_DEFAULT);
 368                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 369                 initrd_end = initrd_start + m68k_ramdisk.size;
 370                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 371         }
 372 #endif
 373
 374 #ifdef CONFIG_ATARI
 375         if (MACH_IS_ATARI)
 376                 atari_stram_reserve_pages((void *)availmem);
 377 #endif
 378 #ifdef CONFIG_SUN3X
 379         if (MACH_IS_SUN3X) {
 380                 dvma_init();
 381         }
 382 #endif
 383
 384 #endif /* !CONFIG_SUN3 */
 385
 386 /* set ISA defs early as possible */
 387 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 388         if (MACH_IS_Q40) {
 389                 isa_type = ISA_TYPE_Q40;
 390                 isa_sex = 0;
 391         }
 392 #ifdef CONFIG_AMIGA_PCMCIA
 393         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 394                 isa_type = ISA_TYPE_AG;
 395                 isa_sex = 1;
 396         }
 397 #endif
 398 #ifdef CONFIG_ATARI_ROM_ISA
 399         if (MACH_IS_ATARI) {
 400                 isa_type = ISA_TYPE_ENEC;
 401                 isa_sex = 0;
 402         }
 403 #endif
 404 #endif
 405 }
 406
 407 static int show_cpuinfo(struct seq_file *m, void *v)
 408 {
 409         const char *cpu, *mmu, *fpu;
 410         unsigned long clockfreq, clockfactor;
 411
 412 #define LOOP_CYCLES_68020       (8)
 413 #define LOOP_CYCLES_68030       (8)
 414 #define LOOP_CYCLES_68040       (3)
 415 #define LOOP_CYCLES_68060       (1)
 416 #define LOOP_CYCLES_COLDFIRE    (2)
 417
 418         if (CPU_IS_020) {
 419                 cpu = "68020";
 420                 clockfactor = LOOP_CYCLES_68020;
 421         } else if (CPU_IS_030) {
 422                 cpu = "68030";
 423                 clockfactor = LOOP_CYCLES_68030;
 424         } else if (CPU_IS_040) {
 425                 cpu = "68040";
 426                 clockfactor = LOOP_CYCLES_68040;
 427         } else if (CPU_IS_060) {
 428                 cpu = "68060";
 429                 clockfactor = LOOP_CYCLES_68060;
 430         } else if (CPU_IS_COLDFIRE) {
 431                 cpu = "ColdFire";
 432                 clockfactor = LOOP_CYCLES_COLDFIRE;
 433         } else {
 434                 cpu = "680x0";
 435                 clockfactor = 0;
 436         }
 437
 438 #ifdef CONFIG_M68KFPU_EMU_ONLY
 439         fpu = "none(soft float)";
 440 #else
 441         if (m68k_fputype & FPU_68881)
 442                 fpu = "68881";
 443         else if (m68k_fputype & FPU_68882)
 444                 fpu = "68882";
 445         else if (m68k_fputype & FPU_68040)
 446                 fpu = "68040";
 447         else if (m68k_fputype & FPU_68060)
 448                 fpu = "68060";
 449         else if (m68k_fputype & FPU_SUNFPA)
 450                 fpu = "Sun FPA";
 451         else if (m68k_fputype & FPU_COLDFIRE)
 452                 fpu = "ColdFire";
 453         else
 454                 fpu = "none";
 455 #endif
 456
 457         if (m68k_mmutype & MMU_68851)
 458                 mmu = "68851";
 459         else if (m68k_mmutype & MMU_68030)
 460                 mmu = "68030";
 461         else if (m68k_mmutype & MMU_68040)
 462                 mmu = "68040";
 463         else if (m68k_mmutype & MMU_68060)
 464                 mmu = "68060";
 465         else if (m68k_mmutype & MMU_SUN3)
 466                 mmu = "Sun-3";
 467         else if (m68k_mmutype & MMU_APOLLO)
 468                 mmu = "Apollo";
 469         else if (m68k_mmutype & MMU_COLDFIRE)
 470                 mmu = "ColdFire";
 471         else
 472                 mmu = "unknown";
 473
 474         clockfreq = loops_per_jiffy * HZ * clockfactor;
 475
 476         seq_printf(m, "CPU:\t\t%s\n"
 477                    "MMU:\t\t%s\n"
 478                    "FPU:\t\t%s\n"
 479                    "Clocking:\t%lu.%1luMHz\n"
 480                    "BogoMips:\t%lu.%02lu\n"
 481                    "Calibration:\t%lu loops\n",
 482                    cpu, mmu, fpu,
 483                    clockfreq/1000000,(clockfreq/100000)%10,
 484                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 485                    loops_per_jiffy);
 486         return 0;
 487 }
 488
 489 static void *c_start(struct seq_file *m, loff_t *pos)
 490 {
 491         return *pos < 1 ? (void *)1 : NULL;
 492 }
 493 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 494 {
 495         ++*pos;
 496         return NULL;
 497 }
 498 static void c_stop(struct seq_file *m, void *v)
 499 {
 500 }
 501 const struct seq_operations cpuinfo_op = {
 502         .start  = c_start,
 503         .next   = c_next,
 504         .stop   = c_stop,
 505         .show   = show_cpuinfo,
 506 };
 507
 508 #ifdef CONFIG_PROC_HARDWARE
 509 static int hardware_proc_show(struct seq_file *m, void *v)
 510 {
 511         char model[80];
 512         unsigned long mem;
 513         int i;
 514
 515         if (mach_get_model)
 516                 mach_get_model(model);
 517         else
 518                 strcpy(model, "Unknown m68k");
 519
 520         seq_printf(m, "Model:\t\t%s\n", model);
 521         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 522                 mem += m68k_memory[i].size;
 523         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 524
 525         if (mach_get_hardware_list)
 526                 mach_get_hardware_list(m);
 527
 528         return 0;
 529 }
 530
 531 static int hardware_proc_open(struct inode *inode, struct file *file)
 532 {
 533         return single_open(file, hardware_proc_show, NULL);
 534 }
 535
 536 static const struct file_operations hardware_proc_fops = {
 537         .open           = hardware_proc_open,
 538         .read           = seq_read,
 539         .llseek         = seq_lseek,
 540         .release        = single_release,
 541 };
 542
 543 static int __init proc_hardware_init(void)
 544 {
 545         proc_create("hardware", 0, NULL, &hardware_proc_fops);
 546         return 0;
 547 }
 548 module_init(proc_hardware_init);
 549 #endif
 550
 551 void check_bugs(void)
 552 {
 553 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 554         if (m68k_fputype == 0) {
 555                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 556                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 557                 pr_emerg("Upgrade your hardware or join the FPU "
 558                         "emulation project\n");
 559                 panic("no FPU");
 560         }
 561 #endif /* !CONFIG_M68KFPU_EMU */
 562 }
 563
 564 #ifdef CONFIG_ADB
 565 static int __init adb_probe_sync_enable (char *str) {
 566         extern int __adb_probe_sync;
 567         __adb_probe_sync = 1;
 568         return 1;
 569 }
 570
 571 __setup("adb_sync", adb_probe_sync_enable);
 572 #endif /* CONFIG_ADB */