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 int (*mach_set_clock_mmss) (unsigned long);
  92 unsigned int (*mach_get_ss)(void);
  93 int (*mach_get_rtc_pll)(struct rtc_pll_info *);
  94 int (*mach_set_rtc_pll)(struct rtc_pll_info *);
  95 EXPORT_SYMBOL(mach_get_ss);
  96 EXPORT_SYMBOL(mach_get_rtc_pll);
  97 EXPORT_SYMBOL(mach_set_rtc_pll);
  98 void (*mach_reset)( void );
  99 void (*mach_halt)( void );
 100 void (*mach_power_off)( void );
 101 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
 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 IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
 110 void (*mach_beep)(unsigned int, unsigned int);
 111 EXPORT_SYMBOL(mach_beep);
 112 #endif
 113 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 114 int isa_type;
 115 int isa_sex;
 116 EXPORT_SYMBOL(isa_type);
 117 EXPORT_SYMBOL(isa_sex);
 118 #endif
 119
 120 extern int amiga_parse_bootinfo(const struct bi_record *);
 121 extern int atari_parse_bootinfo(const struct bi_record *);
 122 extern int mac_parse_bootinfo(const struct bi_record *);
 123 extern int q40_parse_bootinfo(const struct bi_record *);
 124 extern int bvme6000_parse_bootinfo(const struct bi_record *);
 125 extern int mvme16x_parse_bootinfo(const struct bi_record *);
 126 extern int mvme147_parse_bootinfo(const struct bi_record *);
 127 extern int hp300_parse_bootinfo(const struct bi_record *);
 128 extern int apollo_parse_bootinfo(const struct bi_record *);
 129
 130 extern void config_amiga(void);
 131 extern void config_atari(void);
 132 extern void config_mac(void);
 133 extern void config_sun3(void);
 134 extern void config_apollo(void);
 135 extern void config_mvme147(void);
 136 extern void config_mvme16x(void);
 137 extern void config_bvme6000(void);
 138 extern void config_hp300(void);
 139 extern void config_q40(void);
 140 extern void config_sun3x(void);
 141
 142 #define MASK_256K 0xfffc0000
 143
 144 extern void paging_init(void);
 145
 146 static void __init m68k_parse_bootinfo(const struct bi_record *record)
 147 {
 148         uint16_t tag;
 149
 150         save_bootinfo(record);
 151
 152         while ((tag = be16_to_cpu(record->tag)) != BI_LAST) {
 153                 int unknown = 0;
 154                 const void *data = record->data;
 155                 uint16_t size = be16_to_cpu(record->size);
 156
 157                 switch (tag) {
 158                 case BI_MACHTYPE:
 159                 case BI_CPUTYPE:
 160                 case BI_FPUTYPE:
 161                 case BI_MMUTYPE:
 162                         /* Already set up by head.S */
 163                         break;
 164
 165                 case BI_MEMCHUNK:
 166                         if (m68k_num_memory < NUM_MEMINFO) {
 167                                 const struct mem_info *m = data;
 168                                 m68k_memory[m68k_num_memory].addr =
 169                                         be32_to_cpu(m->addr);
 170                                 m68k_memory[m68k_num_memory].size =
 171                                         be32_to_cpu(m->size);
 172                                 m68k_num_memory++;
 173                         } else
 174                                 pr_warn("%s: too many memory chunks\n",
 175                                         __func__);
 176                         break;
 177
 178                 case BI_RAMDISK:
 179                         {
 180                                 const struct mem_info *m = data;
 181                                 m68k_ramdisk.addr = be32_to_cpu(m->addr);
 182                                 m68k_ramdisk.size = be32_to_cpu(m->size);
 183                         }
 184                         break;
 185
 186                 case BI_COMMAND_LINE:
 187                         strlcpy(m68k_command_line, data,
 188                                 sizeof(m68k_command_line));
 189                         break;
 190
 191                 default:
 192                         if (MACH_IS_AMIGA)
 193                                 unknown = amiga_parse_bootinfo(record);
 194                         else if (MACH_IS_ATARI)
 195                                 unknown = atari_parse_bootinfo(record);
 196                         else if (MACH_IS_MAC)
 197                                 unknown = mac_parse_bootinfo(record);
 198                         else if (MACH_IS_Q40)
 199                                 unknown = q40_parse_bootinfo(record);
 200                         else if (MACH_IS_BVME6000)
 201                                 unknown = bvme6000_parse_bootinfo(record);
 202                         else if (MACH_IS_MVME16x)
 203                                 unknown = mvme16x_parse_bootinfo(record);
 204                         else if (MACH_IS_MVME147)
 205                                 unknown = mvme147_parse_bootinfo(record);
 206                         else if (MACH_IS_HP300)
 207                                 unknown = hp300_parse_bootinfo(record);
 208                         else if (MACH_IS_APOLLO)
 209                                 unknown = apollo_parse_bootinfo(record);
 210                         else
 211                                 unknown = 1;
 212                 }
 213                 if (unknown)
 214                         pr_warn("%s: unknown tag 0x%04x ignored\n", __func__,
 215                                 tag);
 216                 record = (struct bi_record *)((unsigned long)record + size);
 217         }
 218
 219         m68k_realnum_memory = m68k_num_memory;
 220 #ifdef CONFIG_SINGLE_MEMORY_CHUNK
 221         if (m68k_num_memory > 1) {
 222                 pr_warn("%s: ignoring last %i chunks of physical memory\n",
 223                         __func__, (m68k_num_memory - 1));
 224                 m68k_num_memory = 1;
 225         }
 226 #endif
 227 }
 228
 229 void __init setup_arch(char **cmdline_p)
 230 {
 231 #ifndef CONFIG_SUN3
 232         int i;
 233 #endif
 234
 235         /* The bootinfo is located right after the kernel */
 236         if (!CPU_IS_COLDFIRE)
 237                 m68k_parse_bootinfo((const struct bi_record *)_end);
 238
 239         if (CPU_IS_040)
 240                 m68k_is040or060 = 4;
 241         else if (CPU_IS_060)
 242                 m68k_is040or060 = 6;
 243
 244         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 245          * be confused by software FPU emulation. BEWARE.
 246          * We should really do our own FPU check at startup.
 247          * [what do we do with buggy 68LC040s? if we have problems
 248          *  with them, we should add a test to check_bugs() below] */
 249 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 250         /* clear the fpu if we have one */
 251         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 252                 volatile int zero = 0;
 253                 asm volatile ("frestore %0" : : "m" (zero));
 254         }
 255 #endif
 256
 257         if (CPU_IS_060) {
 258                 u32 pcr;
 259
 260                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 261                      : "=d" (pcr));
 262                 if (((pcr >> 8) & 0xff) <= 5) {
 263                         pr_warn("Enabling workaround for errata I14\n");
 264                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 265                              : : "d" (pcr | 0x20));
 266                 }
 267         }
 268
 269         init_mm.start_code = PAGE_OFFSET;
 270         init_mm.end_code = (unsigned long)_etext;
 271         init_mm.end_data = (unsigned long)_edata;
 272         init_mm.brk = (unsigned long)_end;
 273
 274 #if defined(CONFIG_BOOTPARAM)
 275         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 276         m68k_command_line[CL_SIZE - 1] = 0;
 277 #endif /* CONFIG_BOOTPARAM */
 278         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 279         *cmdline_p = m68k_command_line;
 280         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 281
 282         parse_early_param();
 283
 284 #ifdef CONFIG_DUMMY_CONSOLE
 285         conswitchp = &dummy_con;
 286 #endif
 287
 288         switch (m68k_machtype) {
 289 #ifdef CONFIG_AMIGA
 290         case MACH_AMIGA:
 291                 config_amiga();
 292                 break;
 293 #endif
 294 #ifdef CONFIG_ATARI
 295         case MACH_ATARI:
 296                 config_atari();
 297                 break;
 298 #endif
 299 #ifdef CONFIG_MAC
 300         case MACH_MAC:
 301                 config_mac();
 302                 break;
 303 #endif
 304 #ifdef CONFIG_SUN3
 305         case MACH_SUN3:
 306                 config_sun3();
 307                 break;
 308 #endif
 309 #ifdef CONFIG_APOLLO
 310         case MACH_APOLLO:
 311                 config_apollo();
 312                 break;
 313 #endif
 314 #ifdef CONFIG_MVME147
 315         case MACH_MVME147:
 316                 config_mvme147();
 317                 break;
 318 #endif
 319 #ifdef CONFIG_MVME16x
 320         case MACH_MVME16x:
 321                 config_mvme16x();
 322                 break;
 323 #endif
 324 #ifdef CONFIG_BVME6000
 325         case MACH_BVME6000:
 326                 config_bvme6000();
 327                 break;
 328 #endif
 329 #ifdef CONFIG_HP300
 330         case MACH_HP300:
 331                 config_hp300();
 332                 break;
 333 #endif
 334 #ifdef CONFIG_Q40
 335         case MACH_Q40:
 336                 config_q40();
 337                 break;
 338 #endif
 339 #ifdef CONFIG_SUN3X
 340         case MACH_SUN3X:
 341                 config_sun3x();
 342                 break;
 343 #endif
 344 #ifdef CONFIG_COLDFIRE
 345         case MACH_M54XX:
 346         case MACH_M5441X:
 347                 config_BSP(NULL, 0);
 348                 break;
 349 #endif
 350         default:
 351                 panic("No configuration setup");
 352         }
 353
 354         paging_init();
 355
 356 #ifdef CONFIG_NATFEAT
 357         nf_init();
 358 #endif
 359
 360 #ifndef CONFIG_SUN3
 361         for (i = 1; i < m68k_num_memory; i++)
 362                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
 363                                   m68k_memory[i].size);
 364 #ifdef CONFIG_BLK_DEV_INITRD
 365         if (m68k_ramdisk.size) {
 366                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
 367                                      m68k_ramdisk.addr, m68k_ramdisk.size,
 368                                      BOOTMEM_DEFAULT);
 369                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 370                 initrd_end = initrd_start + m68k_ramdisk.size;
 371                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 372         }
 373 #endif
 374
 375 #ifdef CONFIG_ATARI
 376         if (MACH_IS_ATARI)
 377                 atari_stram_reserve_pages((void *)availmem);
 378 #endif
 379 #ifdef CONFIG_SUN3X
 380         if (MACH_IS_SUN3X) {
 381                 dvma_init();
 382         }
 383 #endif
 384
 385 #endif /* !CONFIG_SUN3 */
 386
 387 /* set ISA defs early as possible */
 388 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 389         if (MACH_IS_Q40) {
 390                 isa_type = ISA_TYPE_Q40;
 391                 isa_sex = 0;
 392         }
 393 #ifdef CONFIG_AMIGA_PCMCIA
 394         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 395                 isa_type = ISA_TYPE_AG;
 396                 isa_sex = 1;
 397         }
 398 #endif
 399 #ifdef CONFIG_ATARI_ROM_ISA
 400         if (MACH_IS_ATARI) {
 401                 isa_type = ISA_TYPE_ENEC;
 402                 isa_sex = 0;
 403         }
 404 #endif
 405 #endif
 406 }
 407
 408 static int show_cpuinfo(struct seq_file *m, void *v)
 409 {
 410         const char *cpu, *mmu, *fpu;
 411         unsigned long clockfreq, clockfactor;
 412
 413 #define LOOP_CYCLES_68020       (8)
 414 #define LOOP_CYCLES_68030       (8)
 415 #define LOOP_CYCLES_68040       (3)
 416 #define LOOP_CYCLES_68060       (1)
 417 #define LOOP_CYCLES_COLDFIRE    (2)
 418
 419         if (CPU_IS_020) {
 420                 cpu = "68020";
 421                 clockfactor = LOOP_CYCLES_68020;
 422         } else if (CPU_IS_030) {
 423                 cpu = "68030";
 424                 clockfactor = LOOP_CYCLES_68030;
 425         } else if (CPU_IS_040) {
 426                 cpu = "68040";
 427                 clockfactor = LOOP_CYCLES_68040;
 428         } else if (CPU_IS_060) {
 429                 cpu = "68060";
 430                 clockfactor = LOOP_CYCLES_68060;
 431         } else if (CPU_IS_COLDFIRE) {
 432                 cpu = "ColdFire";
 433                 clockfactor = LOOP_CYCLES_COLDFIRE;
 434         } else {
 435                 cpu = "680x0";
 436                 clockfactor = 0;
 437         }
 438
 439 #ifdef CONFIG_M68KFPU_EMU_ONLY
 440         fpu = "none(soft float)";
 441 #else
 442         if (m68k_fputype & FPU_68881)
 443                 fpu = "68881";
 444         else if (m68k_fputype & FPU_68882)
 445                 fpu = "68882";
 446         else if (m68k_fputype & FPU_68040)
 447                 fpu = "68040";
 448         else if (m68k_fputype & FPU_68060)
 449                 fpu = "68060";
 450         else if (m68k_fputype & FPU_SUNFPA)
 451                 fpu = "Sun FPA";
 452         else if (m68k_fputype & FPU_COLDFIRE)
 453                 fpu = "ColdFire";
 454         else
 455                 fpu = "none";
 456 #endif
 457
 458         if (m68k_mmutype & MMU_68851)
 459                 mmu = "68851";
 460         else if (m68k_mmutype & MMU_68030)
 461                 mmu = "68030";
 462         else if (m68k_mmutype & MMU_68040)
 463                 mmu = "68040";
 464         else if (m68k_mmutype & MMU_68060)
 465                 mmu = "68060";
 466         else if (m68k_mmutype & MMU_SUN3)
 467                 mmu = "Sun-3";
 468         else if (m68k_mmutype & MMU_APOLLO)
 469                 mmu = "Apollo";
 470         else if (m68k_mmutype & MMU_COLDFIRE)
 471                 mmu = "ColdFire";
 472         else
 473                 mmu = "unknown";
 474
 475         clockfreq = loops_per_jiffy * HZ * clockfactor;
 476
 477         seq_printf(m, "CPU:\t\t%s\n"
 478                    "MMU:\t\t%s\n"
 479                    "FPU:\t\t%s\n"
 480                    "Clocking:\t%lu.%1luMHz\n"
 481                    "BogoMips:\t%lu.%02lu\n"
 482                    "Calibration:\t%lu loops\n",
 483                    cpu, mmu, fpu,
 484                    clockfreq/1000000,(clockfreq/100000)%10,
 485                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 486                    loops_per_jiffy);
 487         return 0;
 488 }
 489
 490 static void *c_start(struct seq_file *m, loff_t *pos)
 491 {
 492         return *pos < 1 ? (void *)1 : NULL;
 493 }
 494 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 495 {
 496         ++*pos;
 497         return NULL;
 498 }
 499 static void c_stop(struct seq_file *m, void *v)
 500 {
 501 }
 502 const struct seq_operations cpuinfo_op = {
 503         .start  = c_start,
 504         .next   = c_next,
 505         .stop   = c_stop,
 506         .show   = show_cpuinfo,
 507 };
 508
 509 #ifdef CONFIG_PROC_HARDWARE
 510 static int hardware_proc_show(struct seq_file *m, void *v)
 511 {
 512         char model[80];
 513         unsigned long mem;
 514         int i;
 515
 516         if (mach_get_model)
 517                 mach_get_model(model);
 518         else
 519                 strcpy(model, "Unknown m68k");
 520
 521         seq_printf(m, "Model:\t\t%s\n", model);
 522         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 523                 mem += m68k_memory[i].size;
 524         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 525
 526         if (mach_get_hardware_list)
 527                 mach_get_hardware_list(m);
 528
 529         return 0;
 530 }
 531
 532 static int hardware_proc_open(struct inode *inode, struct file *file)
 533 {
 534         return single_open(file, hardware_proc_show, NULL);
 535 }
 536
 537 static const struct file_operations hardware_proc_fops = {
 538         .open           = hardware_proc_open,
 539         .read           = seq_read,
 540         .llseek         = seq_lseek,
 541         .release        = single_release,
 542 };
 543
 544 static int __init proc_hardware_init(void)
 545 {
 546         proc_create("hardware", 0, NULL, &hardware_proc_fops);
 547         return 0;
 548 }
 549 module_init(proc_hardware_init);
 550 #endif
 551
 552 void check_bugs(void)
 553 {
 554 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 555         if (m68k_fputype == 0) {
 556                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 557                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 558                 pr_emerg("Upgrade your hardware or join the FPU "
 559                         "emulation project\n");
 560                 panic("no FPU");
 561         }
 562 #endif /* !CONFIG_M68KFPU_EMU */
 563 }
 564
 565 #ifdef CONFIG_ADB
 566 static int __init adb_probe_sync_enable (char *str) {
 567         extern int __adb_probe_sync;
 568         __adb_probe_sync = 1;
 569         return 1;
 570 }
 571
 572 __setup("adb_sync", adb_probe_sync_enable);
 573 #endif /* CONFIG_ADB */