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 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 #ifndef CONFIG_SUN3
 228         int i;
 229 #endif
 230
 231         /* The bootinfo is located right after the kernel */
 232         if (!CPU_IS_COLDFIRE)
 233                 m68k_parse_bootinfo((const struct bi_record *)_end);
 234
 235         if (CPU_IS_040)
 236                 m68k_is040or060 = 4;
 237         else if (CPU_IS_060)
 238                 m68k_is040or060 = 6;
 239
 240         /* FIXME: m68k_fputype is passed in by Penguin booter, which can
 241          * be confused by software FPU emulation. BEWARE.
 242          * We should really do our own FPU check at startup.
 243          * [what do we do with buggy 68LC040s? if we have problems
 244          *  with them, we should add a test to check_bugs() below] */
 245 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU_ONLY)
 246         /* clear the fpu if we have one */
 247         if (m68k_fputype & (FPU_68881|FPU_68882|FPU_68040|FPU_68060|FPU_COLDFIRE)) {
 248                 volatile int zero = 0;
 249                 asm volatile ("frestore %0" : : "m" (zero));
 250         }
 251 #endif
 252
 253         if (CPU_IS_060) {
 254                 u32 pcr;
 255
 256                 asm (".chip 68060; movec %%pcr,%0; .chip 68k"
 257                      : "=d" (pcr));
 258                 if (((pcr >> 8) & 0xff) <= 5) {
 259                         pr_warn("Enabling workaround for errata I14\n");
 260                         asm (".chip 68060; movec %0,%%pcr; .chip 68k"
 261                              : : "d" (pcr | 0x20));
 262                 }
 263         }
 264
 265         init_mm.start_code = PAGE_OFFSET;
 266         init_mm.end_code = (unsigned long)_etext;
 267         init_mm.end_data = (unsigned long)_edata;
 268         init_mm.brk = (unsigned long)_end;
 269
 270 #if defined(CONFIG_BOOTPARAM)
 271         strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE);
 272         m68k_command_line[CL_SIZE - 1] = 0;
 273 #endif /* CONFIG_BOOTPARAM */
 274         process_uboot_commandline(&m68k_command_line[0], CL_SIZE);
 275         *cmdline_p = m68k_command_line;
 276         memcpy(boot_command_line, *cmdline_p, CL_SIZE);
 277
 278         parse_early_param();
 279
 280 #ifdef CONFIG_DUMMY_CONSOLE
 281         conswitchp = &dummy_con;
 282 #endif
 283
 284         switch (m68k_machtype) {
 285 #ifdef CONFIG_AMIGA
 286         case MACH_AMIGA:
 287                 config_amiga();
 288                 break;
 289 #endif
 290 #ifdef CONFIG_ATARI
 291         case MACH_ATARI:
 292                 config_atari();
 293                 break;
 294 #endif
 295 #ifdef CONFIG_MAC
 296         case MACH_MAC:
 297                 config_mac();
 298                 break;
 299 #endif
 300 #ifdef CONFIG_SUN3
 301         case MACH_SUN3:
 302                 config_sun3();
 303                 break;
 304 #endif
 305 #ifdef CONFIG_APOLLO
 306         case MACH_APOLLO:
 307                 config_apollo();
 308                 break;
 309 #endif
 310 #ifdef CONFIG_MVME147
 311         case MACH_MVME147:
 312                 config_mvme147();
 313                 break;
 314 #endif
 315 #ifdef CONFIG_MVME16x
 316         case MACH_MVME16x:
 317                 config_mvme16x();
 318                 break;
 319 #endif
 320 #ifdef CONFIG_BVME6000
 321         case MACH_BVME6000:
 322                 config_bvme6000();
 323                 break;
 324 #endif
 325 #ifdef CONFIG_HP300
 326         case MACH_HP300:
 327                 config_hp300();
 328                 break;
 329 #endif
 330 #ifdef CONFIG_Q40
 331         case MACH_Q40:
 332                 config_q40();
 333                 break;
 334 #endif
 335 #ifdef CONFIG_SUN3X
 336         case MACH_SUN3X:
 337                 config_sun3x();
 338                 break;
 339 #endif
 340 #ifdef CONFIG_COLDFIRE
 341         case MACH_M54XX:
 342         case MACH_M5441X:
 343                 cf_bootmem_alloc();
 344                 cf_mmu_context_init();
 345                 config_BSP(NULL, 0);
 346                 break;
 347 #endif
 348         default:
 349                 panic("No configuration setup");
 350         }
 351
 352         paging_init();
 353
 354 #ifdef CONFIG_NATFEAT
 355         nf_init();
 356 #endif
 357
 358 #ifndef CONFIG_SUN3
 359         for (i = 1; i < m68k_num_memory; i++)
 360                 free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,
 361                                   m68k_memory[i].size);
 362 #ifdef CONFIG_BLK_DEV_INITRD
 363         if (m68k_ramdisk.size) {
 364                 reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
 365                                      m68k_ramdisk.addr, m68k_ramdisk.size,
 366                                      BOOTMEM_DEFAULT);
 367                 initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 368                 initrd_end = initrd_start + m68k_ramdisk.size;
 369                 pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 370         }
 371 #endif
 372
 373 #ifdef CONFIG_ATARI
 374         if (MACH_IS_ATARI)
 375                 atari_stram_reserve_pages((void *)availmem);
 376 #endif
 377 #ifdef CONFIG_SUN3X
 378         if (MACH_IS_SUN3X) {
 379                 dvma_init();
 380         }
 381 #endif
 382
 383 #endif /* !CONFIG_SUN3 */
 384
 385 /* set ISA defs early as possible */
 386 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 387         if (MACH_IS_Q40) {
 388                 isa_type = ISA_TYPE_Q40;
 389                 isa_sex = 0;
 390         }
 391 #ifdef CONFIG_AMIGA_PCMCIA
 392         if (MACH_IS_AMIGA && AMIGAHW_PRESENT(PCMCIA)) {
 393                 isa_type = ISA_TYPE_AG;
 394                 isa_sex = 1;
 395         }
 396 #endif
 397 #ifdef CONFIG_ATARI_ROM_ISA
 398         if (MACH_IS_ATARI) {
 399                 isa_type = ISA_TYPE_ENEC;
 400                 isa_sex = 0;
 401         }
 402 #endif
 403 #endif
 404 }
 405
 406 static int show_cpuinfo(struct seq_file *m, void *v)
 407 {
 408         const char *cpu, *mmu, *fpu;
 409         unsigned long clockfreq, clockfactor;
 410
 411 #define LOOP_CYCLES_68020       (8)
 412 #define LOOP_CYCLES_68030       (8)
 413 #define LOOP_CYCLES_68040       (3)
 414 #define LOOP_CYCLES_68060       (1)
 415 #define LOOP_CYCLES_COLDFIRE    (2)
 416
 417         if (CPU_IS_020) {
 418                 cpu = "68020";
 419                 clockfactor = LOOP_CYCLES_68020;
 420         } else if (CPU_IS_030) {
 421                 cpu = "68030";
 422                 clockfactor = LOOP_CYCLES_68030;
 423         } else if (CPU_IS_040) {
 424                 cpu = "68040";
 425                 clockfactor = LOOP_CYCLES_68040;
 426         } else if (CPU_IS_060) {
 427                 cpu = "68060";
 428                 clockfactor = LOOP_CYCLES_68060;
 429         } else if (CPU_IS_COLDFIRE) {
 430                 cpu = "ColdFire";
 431                 clockfactor = LOOP_CYCLES_COLDFIRE;
 432         } else {
 433                 cpu = "680x0";
 434                 clockfactor = 0;
 435         }
 436
 437 #ifdef CONFIG_M68KFPU_EMU_ONLY
 438         fpu = "none(soft float)";
 439 #else
 440         if (m68k_fputype & FPU_68881)
 441                 fpu = "68881";
 442         else if (m68k_fputype & FPU_68882)
 443                 fpu = "68882";
 444         else if (m68k_fputype & FPU_68040)
 445                 fpu = "68040";
 446         else if (m68k_fputype & FPU_68060)
 447                 fpu = "68060";
 448         else if (m68k_fputype & FPU_SUNFPA)
 449                 fpu = "Sun FPA";
 450         else if (m68k_fputype & FPU_COLDFIRE)
 451                 fpu = "ColdFire";
 452         else
 453                 fpu = "none";
 454 #endif
 455
 456         if (m68k_mmutype & MMU_68851)
 457                 mmu = "68851";
 458         else if (m68k_mmutype & MMU_68030)
 459                 mmu = "68030";
 460         else if (m68k_mmutype & MMU_68040)
 461                 mmu = "68040";
 462         else if (m68k_mmutype & MMU_68060)
 463                 mmu = "68060";
 464         else if (m68k_mmutype & MMU_SUN3)
 465                 mmu = "Sun-3";
 466         else if (m68k_mmutype & MMU_APOLLO)
 467                 mmu = "Apollo";
 468         else if (m68k_mmutype & MMU_COLDFIRE)
 469                 mmu = "ColdFire";
 470         else
 471                 mmu = "unknown";
 472
 473         clockfreq = loops_per_jiffy * HZ * clockfactor;
 474
 475         seq_printf(m, "CPU:\t\t%s\n"
 476                    "MMU:\t\t%s\n"
 477                    "FPU:\t\t%s\n"
 478                    "Clocking:\t%lu.%1luMHz\n"
 479                    "BogoMips:\t%lu.%02lu\n"
 480                    "Calibration:\t%lu loops\n",
 481                    cpu, mmu, fpu,
 482                    clockfreq/1000000,(clockfreq/100000)%10,
 483                    loops_per_jiffy/(500000/HZ),(loops_per_jiffy/(5000/HZ))%100,
 484                    loops_per_jiffy);
 485         return 0;
 486 }
 487
 488 static void *c_start(struct seq_file *m, loff_t *pos)
 489 {
 490         return *pos < 1 ? (void *)1 : NULL;
 491 }
 492 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 493 {
 494         ++*pos;
 495         return NULL;
 496 }
 497 static void c_stop(struct seq_file *m, void *v)
 498 {
 499 }
 500 const struct seq_operations cpuinfo_op = {
 501         .start  = c_start,
 502         .next   = c_next,
 503         .stop   = c_stop,
 504         .show   = show_cpuinfo,
 505 };
 506
 507 #ifdef CONFIG_PROC_HARDWARE
 508 static int hardware_proc_show(struct seq_file *m, void *v)
 509 {
 510         char model[80];
 511         unsigned long mem;
 512         int i;
 513
 514         if (mach_get_model)
 515                 mach_get_model(model);
 516         else
 517                 strcpy(model, "Unknown m68k");
 518
 519         seq_printf(m, "Model:\t\t%s\n", model);
 520         for (mem = 0, i = 0; i < m68k_num_memory; i++)
 521                 mem += m68k_memory[i].size;
 522         seq_printf(m, "System Memory:\t%ldK\n", mem >> 10);
 523
 524         if (mach_get_hardware_list)
 525                 mach_get_hardware_list(m);
 526
 527         return 0;
 528 }
 529
 530 static int hardware_proc_open(struct inode *inode, struct file *file)
 531 {
 532         return single_open(file, hardware_proc_show, NULL);
 533 }
 534
 535 static const struct file_operations hardware_proc_fops = {
 536         .open           = hardware_proc_open,
 537         .read           = seq_read,
 538         .llseek         = seq_lseek,
 539         .release        = single_release,
 540 };
 541
 542 static int __init proc_hardware_init(void)
 543 {
 544         proc_create("hardware", 0, NULL, &hardware_proc_fops);
 545         return 0;
 546 }
 547 module_init(proc_hardware_init);
 548 #endif
 549
 550 void check_bugs(void)
 551 {
 552 #if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
 553         if (m68k_fputype == 0) {
 554                 pr_emerg("*** YOU DO NOT HAVE A FLOATING POINT UNIT, "
 555                         "WHICH IS REQUIRED BY LINUX/M68K ***\n");
 556                 pr_emerg("Upgrade your hardware or join the FPU "
 557                         "emulation project\n");
 558                 panic("no FPU");
 559         }
 560 #endif /* !CONFIG_M68KFPU_EMU */
 561 }
 562
 563 #ifdef CONFIG_ADB
 564 static int __init adb_probe_sync_enable (char *str) {
 565         extern int __adb_probe_sync;
 566         __adb_probe_sync = 1;
 567         return 1;
 568 }
 569
 570 __setup("adb_sync", adb_probe_sync_enable);
 571 #endif /* CONFIG_ADB */