arch/ppc/platforms/apus_setup.c

   1 /*
   2  *  Copyright (C) 1998, 1999  Jesper Skov
   3  *
   4  *  Basically what is needed to replace functionality found in
   5  *  arch/m68k allowing Amiga drivers to work under APUS.
   6  *  Bits of code and/or ideas from arch/m68k and arch/ppc files.
   7  *
   8  * TODO:
   9  *  This file needs a *really* good cleanup. Restructure and optimize.
  10  *  Make sure it can be compiled for non-APUS configs. Begin to move
  11  *  Amiga specific stuff into mach/amiga.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/init.h>
  17 #include <linux/initrd.h>
  18 #include <linux/seq_file.h>
  19
  20 /* Needs INITSERIAL call in head.S! */
  21 #undef APUS_DEBUG
  22
  23 #include <asm/bootinfo.h>
  24 #include <asm/setup.h>
  25 #include <asm/amigahw.h>
  26 #include <asm/amigaints.h>
  27 #include <asm/amigappc.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/dma.h>
  30 #include <asm/machdep.h>
  31 #include <asm/time.h>
  32
  33 unsigned long m68k_machtype;
  34 char debug_device[6] = "";
  35
  36 extern void amiga_init_IRQ(void);
  37
  38 extern void apus_setup_pci_ptrs(void);
  39
  40 void (*mach_sched_init) (void (*handler)(int, void *, struct pt_regs *)) __initdata = NULL;
  41 /* machine dependent irq functions */
  42 void (*mach_init_IRQ) (void) __initdata = NULL;
  43 void (*(*mach_default_handler)[]) (int, void *, struct pt_regs *) = NULL;
  44 void (*mach_get_model) (char *model) = NULL;
  45 int (*mach_get_hardware_list) (char *buffer) = NULL;
  46 int (*mach_get_irq_list) (struct seq_file *, void *) = NULL;
  47 void (*mach_process_int) (int, struct pt_regs *) = NULL;
  48 /* machine dependent timer functions */
  49 unsigned long (*mach_gettimeoffset) (void);
  50 void (*mach_gettod) (int*, int*, int*, int*, int*, int*);
  51 int (*mach_hwclk) (int, struct hwclk_time*) = NULL;
  52 int (*mach_set_clock_mmss) (unsigned long) = NULL;
  53 void (*mach_reset)( void );
  54 long mach_max_dma_address = 0x00ffffff; /* default set to the lower 16MB */
  55 #ifdef CONFIG_HEARTBEAT
  56 void (*mach_heartbeat) (int) = NULL;
  57 extern void apus_heartbeat (void);
  58 #endif
  59
  60 extern unsigned long amiga_model;
  61 extern unsigned decrementer_count;/* count value for 1e6/HZ microseconds */
  62 extern unsigned count_period_num; /* 1 decrementer count equals */
  63 extern unsigned count_period_den; /* count_period_num / count_period_den us */
  64
  65 int num_memory = 0;
  66 struct mem_info memory[NUM_MEMINFO];/* memory description */
  67 /* FIXME: Duplicate memory data to avoid conflicts with m68k shared code. */
  68 int m68k_realnum_memory = 0;
  69 struct mem_info m68k_memory[NUM_MEMINFO];/* memory description */
  70
  71 struct mem_info ramdisk;
  72
  73 extern void config_amiga(void);
  74
  75 static int __60nsram = 0;
  76
  77 /* for cpuinfo */
  78 static int __bus_speed = 0;
  79 static int __speed_test_failed = 0;
  80
  81 /********************************************** COMPILE PROTECTION */
  82 /* Provide some stubs that links to Amiga specific functions.
  83  * This allows CONFIG_APUS to be removed from generic PPC files while
  84  * preventing link errors for other PPC targets.
  85  */
  86 unsigned long apus_get_rtc_time(void)
  87 {
  88 #ifdef CONFIG_APUS
  89         extern unsigned long m68k_get_rtc_time(void);
  90
  91         return m68k_get_rtc_time ();
  92 #else
  93         return 0;
  94 #endif
  95 }
  96
  97 int apus_set_rtc_time(unsigned long nowtime)
  98 {
  99 #ifdef CONFIG_APUS
 100         extern int m68k_set_rtc_time(unsigned long nowtime);
 101
 102         return m68k_set_rtc_time (nowtime);
 103 #else
 104         return 0;
 105 #endif
 106 }
 107
 108 /*********************************************************** SETUP */
 109 /* From arch/m68k/kernel/setup.c. */
 110 void __init apus_setup_arch(void)
 111 {
 112 #ifdef CONFIG_APUS
 113         extern char cmd_line[];
 114         int i;
 115         char *p, *q;
 116
 117         /* Let m68k-shared code know it should do the Amiga thing. */
 118         m68k_machtype = MACH_AMIGA;
 119
 120         /* Parse the command line for arch-specific options.
 121          * For the m68k, this is currently only "debug=xxx" to enable printing
 122          * certain kernel messages to some machine-specific device.  */
 123         for( p = cmd_line; p && *p; ) {
 124             i = 0;
 125             if (!strncmp( p, "debug=", 6 )) {
 126                     strlcpy( debug_device, p+6, sizeof(debug_device) );
 127                     if ((q = strchr( debug_device, ' ' ))) *q = 0;
 128                     i = 1;
 129             } else if (!strncmp( p, "60nsram", 7 )) {
 130                     APUS_WRITE (APUS_REG_WAITSTATE,
 131                                 REGWAITSTATE_SETRESET
 132                                 |REGWAITSTATE_PPCR
 133                                 |REGWAITSTATE_PPCW);
 134                     __60nsram = 1;
 135                     i = 1;
 136             }
 137
 138             if (i) {
 139                 /* option processed, delete it */
 140                 if ((q = strchr( p, ' ' )))
 141                     strcpy( p, q+1 );
 142                 else
 143                     *p = 0;
 144             } else {
 145                 if ((p = strchr( p, ' ' ))) ++p;
 146             }
 147         }
 148
 149         config_amiga();
 150
 151 #if 0 /* Enable for logging - also include logging.o in Makefile rule */
 152         {
 153 #define LOG_SIZE 4096
 154                 void* base;
 155
 156                 /* Throw away some memory - the P5 firmare stomps on top
 157                  * of CHIP memory during bootup.
 158                  */
 159                 amiga_chip_alloc(0x1000);
 160
 161                 base = amiga_chip_alloc(LOG_SIZE+sizeof(klog_data_t));
 162                 LOG_INIT(base, base+sizeof(klog_data_t), LOG_SIZE);
 163         }
 164 #endif
 165 #endif
 166 }
 167
 168 int
 169 apus_show_cpuinfo(struct seq_file *m)
 170 {
 171         extern int __map_without_bats;
 172         extern unsigned long powerup_PCI_present;
 173
 174         seq_printf(m, "machine\t\t: Amiga\n");
 175         seq_printf(m, "bus speed\t: %d%s", __bus_speed,
 176                    (__speed_test_failed) ? " [failed]\n" : "\n");
 177         seq_printf(m, "using BATs\t: %s\n",
 178                    (__map_without_bats) ? "No" : "Yes");
 179         seq_printf(m, "ram speed\t: %dns\n", (__60nsram) ? 60 : 70);
 180         seq_printf(m, "PCI bridge\t: %s\n",
 181                    (powerup_PCI_present) ? "Yes" : "No");
 182         return 0;
 183 }
 184
 185 static void get_current_tb(unsigned long long *time)
 186 {
 187         __asm __volatile ("1:mftbu 4      \n\t"
 188                           "  mftb  5      \n\t"
 189                           "  mftbu 6      \n\t"
 190                           "  cmpw  4,6    \n\t"
 191                           "  bne   1b     \n\t"
 192                           "  stw   4,0(%0)\n\t"
 193                           "  stw   5,4(%0)\n\t"
 194                           :
 195                           : "r" (time)
 196                           : "r4", "r5", "r6");
 197 }
 198
 199
 200 void apus_calibrate_decr(void)
 201 {
 202 #ifdef CONFIG_APUS
 203         unsigned long freq;
 204
 205         /* This algorithm for determining the bus speed was
 206            contributed by Ralph Schmidt. */
 207         unsigned long long start, stop;
 208         int bus_speed;
 209         int speed_test_failed = 0;
 210
 211         {
 212                 unsigned long loop = amiga_eclock / 10;
 213
 214                 get_current_tb (&start);
 215                 while (loop--) {
 216                         unsigned char tmp;
 217
 218                         tmp = ciaa.pra;
 219                 }
 220                 get_current_tb (&stop);
 221         }
 222
 223         bus_speed = (((unsigned long)(stop-start))*10*4) / 1000000;
 224         if (AMI_1200 == amiga_model)
 225                 bus_speed /= 2;
 226
 227         if ((bus_speed >= 47) && (bus_speed < 53)) {
 228                 bus_speed = 50;
 229                 freq = 12500000;
 230         } else if ((bus_speed >= 57) && (bus_speed < 63)) {
 231                 bus_speed = 60;
 232                 freq = 15000000;
 233         } else if ((bus_speed >= 63) && (bus_speed < 69)) {
 234                 bus_speed = 67;
 235                 freq = 16666667;
 236         } else {
 237                 printk ("APUS: Unable to determine bus speed (%d). "
 238                         "Defaulting to 50MHz", bus_speed);
 239                 bus_speed = 50;
 240                 freq = 12500000;
 241                 speed_test_failed = 1;
 242         }
 243
 244         /* Ease diagnostics... */
 245         {
 246                 extern int __map_without_bats;
 247                 extern unsigned long powerup_PCI_present;
 248
 249                 printk ("APUS: BATs=%d, BUS=%dMHz",
 250                         (__map_without_bats) ? 0 : 1,
 251                         bus_speed);
 252                 if (speed_test_failed)
 253                         printk ("[FAILED - please report]");
 254
 255                 printk (", RAM=%dns, PCI bridge=%d\n",
 256                         (__60nsram) ? 60 : 70,
 257                         (powerup_PCI_present) ? 1 : 0);
 258
 259                 /* print a bit more if asked politely... */
 260                 if (!(ciaa.pra & 0x40)){
 261                         extern unsigned int bat_addrs[4][3];
 262                         int b;
 263                         for (b = 0; b < 4; ++b) {
 264                                 printk ("APUS: BAT%d ", b);
 265                                 printk ("%08x-%08x -> %08x\n",
 266                                         bat_addrs[b][0],
 267                                         bat_addrs[b][1],
 268                                         bat_addrs[b][2]);
 269                         }
 270                 }
 271
 272         }
 273
 274         printk("time_init: decrementer frequency = %lu.%.6lu MHz\n",
 275                freq/1000000, freq%1000000);
 276         tb_ticks_per_jiffy = freq / HZ;
 277         tb_to_us = mulhwu_scale_factor(freq, 1000000);
 278
 279         __bus_speed = bus_speed;
 280         __speed_test_failed = speed_test_failed;
 281 #endif
 282 }
 283
 284 void arch_gettod(int *year, int *mon, int *day, int *hour,
 285                  int *min, int *sec)
 286 {
 287 #ifdef CONFIG_APUS
 288         if (mach_gettod)
 289                 mach_gettod(year, mon, day, hour, min, sec);
 290         else
 291                 *year = *mon = *day = *hour = *min = *sec = 0;
 292 #endif
 293 }
 294
 295 /* for "kbd-reset" cmdline param */
 296 __init
 297 void kbd_reset_setup(char *str, int *ints)
 298 {
 299 }
 300
 301 /*********************************************************** MEMORY */
 302 #define KMAP_MAX 32
 303 unsigned long kmap_chunks[KMAP_MAX*3];
 304 int kmap_chunk_count = 0;
 305
 306 /* From pgtable.h */
 307 static __inline__ pte_t *my_find_pte(struct mm_struct *mm,unsigned long va)
 308 {
 309         pgd_t *dir = 0;
 310         pmd_t *pmd = 0;
 311         pte_t *pte = 0;
 312
 313         va &= PAGE_MASK;
 314
 315         dir = pgd_offset( mm, va );
 316         if (dir)
 317         {
 318                 pmd = pmd_offset(dir, va & PAGE_MASK);
 319                 if (pmd && pmd_present(*pmd))
 320                 {
 321                         pte = pte_offset(pmd, va);
 322                 }
 323         }
 324         return pte;
 325 }
 326
 327
 328 /* Again simulating an m68k/mm/kmap.c function. */
 329 void kernel_set_cachemode( unsigned long address, unsigned long size,
 330                            unsigned int cmode )
 331 {
 332         unsigned long mask, flags;
 333
 334         switch (cmode)
 335         {
 336         case IOMAP_FULL_CACHING:
 337                 mask = ~(_PAGE_NO_CACHE | _PAGE_GUARDED);
 338                 flags = 0;
 339                 break;
 340         case IOMAP_NOCACHE_SER:
 341                 mask = ~0;
 342                 flags = (_PAGE_NO_CACHE | _PAGE_GUARDED);
 343                 break;
 344         default:
 345                 panic ("kernel_set_cachemode() doesn't support mode %d\n",
 346                        cmode);
 347                 break;
 348         }
 349
 350         size /= PAGE_SIZE;
 351         address &= PAGE_MASK;
 352         while (size--)
 353         {
 354                 pte_t *pte;
 355
 356                 pte = my_find_pte(&init_mm, address);
 357                 if ( !pte )
 358                 {
 359                         printk("pte NULL in kernel_set_cachemode()\n");
 360                         return;
 361                 }
 362
 363                 pte_val (*pte) &= mask;
 364                 pte_val (*pte) |= flags;
 365                 flush_tlb_page(find_vma(&init_mm,address),address);
 366
 367                 address += PAGE_SIZE;
 368         }
 369 }
 370
 371 unsigned long mm_ptov (unsigned long paddr)
 372 {
 373         unsigned long ret;
 374         if (paddr < 16*1024*1024)
 375                 ret = ZTWO_VADDR(paddr);
 376         else {
 377                 int i;
 378
 379                 for (i = 0; i < kmap_chunk_count;){
 380                         unsigned long phys = kmap_chunks[i++];
 381                         unsigned long size = kmap_chunks[i++];
 382                         unsigned long virt = kmap_chunks[i++];
 383                         if (paddr >= phys
 384                             && paddr < (phys + size)){
 385                                 ret = virt + paddr - phys;
 386                                 goto exit;
 387                         }
 388                 }
 389
 390                 ret = (unsigned long) __va(paddr);
 391         }
 392 exit:
 393 #ifdef DEBUGPV
 394         printk ("PTOV(%lx)=%lx\n", paddr, ret);
 395 #endif
 396         return ret;
 397 }
 398
 399 int mm_end_of_chunk (unsigned long addr, int len)
 400 {
 401         if (memory[0].addr + memory[0].size == addr + len)
 402                 return 1;
 403         return 0;
 404 }
 405
 406 /*********************************************************** CACHE */
 407
 408 #define L1_CACHE_BYTES 32
 409 #define MAX_CACHE_SIZE 8192
 410 void cache_push(__u32 addr, int length)
 411 {
 412         addr = mm_ptov(addr);
 413
 414         if (MAX_CACHE_SIZE < length)
 415                 length = MAX_CACHE_SIZE;
 416
 417         while(length > 0){
 418                 __asm ("dcbf 0,%0\n\t"
 419                        : : "r" (addr));
 420                 addr += L1_CACHE_BYTES;
 421                 length -= L1_CACHE_BYTES;
 422         }
 423         /* Also flush trailing block */
 424         __asm ("dcbf 0,%0\n\t"
 425                "sync \n\t"
 426                : : "r" (addr));
 427 }
 428
 429 void cache_clear(__u32 addr, int length)
 430 {
 431         if (MAX_CACHE_SIZE < length)
 432                 length = MAX_CACHE_SIZE;
 433
 434         addr = mm_ptov(addr);
 435
 436         __asm ("dcbf 0,%0\n\t"
 437                "sync \n\t"
 438                "icbi 0,%0 \n\t"
 439                "isync \n\t"
 440                : : "r" (addr));
 441
 442         addr += L1_CACHE_BYTES;
 443         length -= L1_CACHE_BYTES;
 444
 445         while(length > 0){
 446                 __asm ("dcbf 0,%0\n\t"
 447                        "sync \n\t"
 448                        "icbi 0,%0 \n\t"
 449                        "isync \n\t"
 450                        : : "r" (addr));
 451                 addr += L1_CACHE_BYTES;
 452                 length -= L1_CACHE_BYTES;
 453         }
 454
 455         __asm ("dcbf 0,%0\n\t"
 456                "sync \n\t"
 457                "icbi 0,%0 \n\t"
 458                "isync \n\t"
 459                : : "r" (addr));
 460 }
 461
 462 /****************************************************** from setup.c */
 463 void
 464 apus_restart(char *cmd)
 465 {
 466         local_irq_disable();
 467
 468         APUS_WRITE(APUS_REG_LOCK,
 469                    REGLOCK_BLACKMAGICK1|REGLOCK_BLACKMAGICK2);
 470         APUS_WRITE(APUS_REG_LOCK,
 471                    REGLOCK_BLACKMAGICK1|REGLOCK_BLACKMAGICK3);
 472         APUS_WRITE(APUS_REG_LOCK,
 473                    REGLOCK_BLACKMAGICK2|REGLOCK_BLACKMAGICK3);
 474         APUS_WRITE(APUS_REG_SHADOW, REGSHADOW_SELFRESET);
 475         APUS_WRITE(APUS_REG_RESET, REGRESET_AMIGARESET);
 476         for(;;);
 477 }
 478
 479 void
 480 apus_power_off(void)
 481 {
 482         for (;;);
 483 }
 484
 485 void
 486 apus_halt(void)
 487 {
 488    apus_restart(NULL);
 489 }
 490
 491 /****************************************************** IRQ stuff */
 492
 493 static unsigned char last_ipl[8];
 494
 495 int apus_get_irq(struct pt_regs* regs)
 496 {
 497         unsigned char ipl_emu, mask;
 498         unsigned int level;
 499
 500         APUS_READ(APUS_IPL_EMU, ipl_emu);
 501         level = (ipl_emu >> 3) & IPLEMU_IPLMASK;
 502         mask = IPLEMU_SETRESET|IPLEMU_DISABLEINT|level;
 503         level ^= 7;
 504
 505         /* Save previous IPL value */
 506         if (last_ipl[level])
 507                 return -2;
 508         last_ipl[level] = ipl_emu;
 509
 510         /* Set to current IPL value */
 511         APUS_WRITE(APUS_IPL_EMU, mask);
 512         APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT|level);
 513
 514
 515 #ifdef __INTERRUPT_DEBUG
 516         printk("<%d:%d>", level, ~ipl_emu & IPLEMU_IPLMASK);
 517 #endif
 518         return level + IRQ_AMIGA_AUTO;
 519 }
 520
 521 void apus_end_irq(unsigned int irq)
 522 {
 523         unsigned char ipl_emu;
 524         unsigned int level = irq - IRQ_AMIGA_AUTO;
 525 #ifdef __INTERRUPT_DEBUG
 526         printk("{%d}", ~last_ipl[level] & IPLEMU_IPLMASK);
 527 #endif
 528         /* Restore IPL to the previous value */
 529         ipl_emu = last_ipl[level] & IPLEMU_IPLMASK;
 530         APUS_WRITE(APUS_IPL_EMU, IPLEMU_SETRESET|IPLEMU_DISABLEINT|ipl_emu);
 531         last_ipl[level] = 0;
 532         ipl_emu ^= 7;
 533         APUS_WRITE(APUS_IPL_EMU, IPLEMU_DISABLEINT|ipl_emu);
 534 }
 535
 536 /****************************************************** debugging */
 537
 538 /* some serial hardware definitions */
 539 #define SDR_OVRUN   (1<<15)
 540 #define SDR_RBF     (1<<14)
 541 #define SDR_TBE     (1<<13)
 542 #define SDR_TSRE    (1<<12)
 543
 544 #define AC_SETCLR   (1<<15)
 545 #define AC_UARTBRK  (1<<11)
 546
 547 #define SER_DTR     (1<<7)
 548 #define SER_RTS     (1<<6)
 549 #define SER_DCD     (1<<5)
 550 #define SER_CTS     (1<<4)
 551 #define SER_DSR     (1<<3)
 552
 553 static __inline__ void ser_RTSon(void)
 554 {
 555     ciab.pra &= ~SER_RTS; /* active low */
 556 }
 557
 558 int __debug_ser_out( unsigned char c )
 559 {
 560         amiga_custom.serdat = c | 0x100;
 561         mb();
 562         while (!(amiga_custom.serdatr & 0x2000))
 563                 barrier();
 564         return 1;
 565 }
 566
 567 unsigned char __debug_ser_in( void )
 568 {
 569         unsigned char c;
 570
 571         /* XXX: is that ok?? derived from amiga_ser.c... */
 572         while( !(amiga_custom.intreqr & IF_RBF) )
 573                 barrier();
 574         c = amiga_custom.serdatr;
 575         /* clear the interrupt, so that another character can be read */
 576         amiga_custom.intreq = IF_RBF;
 577         return c;
 578 }
 579
 580 int __debug_serinit( void )
 581 {
 582         unsigned long flags;
 583
 584         local_irq_save(flags);
 585
 586         /* turn off Rx and Tx interrupts */
 587         amiga_custom.intena = IF_RBF | IF_TBE;
 588
 589         /* clear any pending interrupt */
 590         amiga_custom.intreq = IF_RBF | IF_TBE;
 591
 592         local_irq_restore(flags);
 593
 594         /*
 595          * set the appropriate directions for the modem control flags,
 596          * and clear RTS and DTR
 597          */
 598         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
 599         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
 600
 601 #ifdef CONFIG_KGDB
 602         /* turn Rx interrupts on for GDB */
 603         amiga_custom.intena = IF_SETCLR | IF_RBF;
 604         ser_RTSon();
 605 #endif
 606
 607         return 0;
 608 }
 609
 610 void __debug_print_hex(unsigned long x)
 611 {
 612         int i;
 613         char hexchars[] = "0123456789ABCDEF";
 614
 615         for (i = 0; i < 8; i++) {
 616                 __debug_ser_out(hexchars[(x >> 28) & 15]);
 617                 x <<= 4;
 618         }
 619         __debug_ser_out('\n');
 620         __debug_ser_out('\r');
 621 }
 622
 623 void __debug_print_string(char* s)
 624 {
 625         unsigned char c;
 626         while((c = *s++))
 627                 __debug_ser_out(c);
 628         __debug_ser_out('\n');
 629         __debug_ser_out('\r');
 630 }
 631
 632 static void apus_progress(char *s, unsigned short value)
 633 {
 634         __debug_print_string(s);
 635 }
 636
 637 /****************************************************** init */
 638
 639 /* The number of spurious interrupts */
 640 volatile unsigned int num_spurious;
 641
 642 extern struct irqaction amiga_sys_irqaction[AUTO_IRQS];
 643
 644
 645 extern void amiga_enable_irq(unsigned int irq);
 646 extern void amiga_disable_irq(unsigned int irq);
 647
 648 struct hw_interrupt_type amiga_sys_irqctrl = {
 649         .typename = "Amiga IPL",
 650         .end = apus_end_irq,
 651 };
 652
 653 struct hw_interrupt_type amiga_irqctrl = {
 654         .typename = "Amiga    ",
 655         .enable = amiga_enable_irq,
 656         .disable = amiga_disable_irq,
 657 };
 658
 659 #define HARDWARE_MAPPED_SIZE (512*1024)
 660 unsigned long __init apus_find_end_of_memory(void)
 661 {
 662         int shadow = 0;
 663         unsigned long total;
 664
 665         /* The memory size reported by ADOS excludes the 512KB
 666            reserved for PPC exception registers and possibly 512KB
 667            containing a shadow of the ADOS ROM. */
 668         {
 669                 unsigned long size = memory[0].size;
 670
 671                 /* If 2MB aligned, size was probably user
 672                    specified. We can't tell anything about shadowing
 673                    in this case so skip shadow assignment. */
 674                 if (0 != (size & 0x1fffff)){
 675                         /* Align to 512KB to ensure correct handling
 676                            of both memfile and system specified
 677                            sizes. */
 678                         size = ((size+0x0007ffff) & 0xfff80000);
 679                         /* If memory is 1MB aligned, assume
 680                            shadowing. */
 681                         shadow = !(size & 0x80000);
 682                 }
 683
 684                 /* Add the chunk that ADOS does not see. by aligning
 685                    the size to the nearest 2MB limit upwards.  */
 686                 memory[0].size = ((size+0x001fffff) & 0xffe00000);
 687         }
 688
 689         ppc_memstart = memory[0].addr;
 690         ppc_memoffset = PAGE_OFFSET - PPC_MEMSTART;
 691         total = memory[0].size;
 692
 693         /* Remove the memory chunks that are controlled by special
 694            Phase5 hardware. */
 695
 696         /* Remove the upper 512KB if it contains a shadow of
 697            the ADOS ROM. FIXME: It might be possible to
 698            disable this shadow HW. Check the booter
 699            (ppc_boot.c) */
 700         if (shadow)
 701                 total -= HARDWARE_MAPPED_SIZE;
 702
 703         /* Remove the upper 512KB where the PPC exception
 704            vectors are mapped. */
 705         total -= HARDWARE_MAPPED_SIZE;
 706
 707         /* Linux/APUS only handles one block of memory -- the one on
 708            the PowerUP board. Other system memory is horrible slow in
 709            comparison. The user can use other memory for swapping
 710            using the z2ram device. */
 711         return total;
 712 }
 713
 714 static void __init
 715 apus_map_io(void)
 716 {
 717         /* Map PPC exception vectors. */
 718         io_block_mapping(0xfff00000, 0xfff00000, 0x00020000, _PAGE_KERNEL);
 719         /* Map chip and ZorroII memory */
 720         io_block_mapping(zTwoBase,   0x00000000, 0x01000000, _PAGE_IO);
 721 }
 722
 723 __init
 724 void apus_init_IRQ(void)
 725 {
 726         struct irqaction *action;
 727         int i;
 728
 729 #ifdef CONFIG_PCI
 730         apus_setup_pci_ptrs();
 731 #endif
 732
 733         for ( i = 0 ; i < AMI_IRQS; i++ ) {
 734                 irq_desc[i].status = IRQ_LEVEL;
 735                 if (i < IRQ_AMIGA_AUTO) {
 736                         irq_desc[i].chip = &amiga_irqctrl;
 737                 } else {
 738                         irq_desc[i].chip = &amiga_sys_irqctrl;
 739                         action = &amiga_sys_irqaction[i-IRQ_AMIGA_AUTO];
 740                         if (action->name)
 741                                 setup_irq(i, action);
 742                 }
 743         }
 744
 745         amiga_init_IRQ();
 746
 747 }
 748
 749 __init
 750 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 751                    unsigned long r6, unsigned long r7)
 752 {
 753         extern int parse_bootinfo(const struct bi_record *);
 754         extern char _end[];
 755
 756         /* Parse bootinfo. The bootinfo is located right after
 757            the kernel bss */
 758         parse_bootinfo((const struct bi_record *)&_end);
 759 #ifdef CONFIG_BLK_DEV_INITRD
 760         /* Take care of initrd if we have one. Use data from
 761            bootinfo to avoid the need to initialize PPC
 762            registers when kernel is booted via a PPC reset. */
 763         if ( ramdisk.addr ) {
 764                 initrd_start = (unsigned long) __va(ramdisk.addr);
 765                 initrd_end = (unsigned long)
 766                         __va(ramdisk.size + ramdisk.addr);
 767         }
 768 #endif /* CONFIG_BLK_DEV_INITRD */
 769
 770         ISA_DMA_THRESHOLD = 0x00ffffff;
 771
 772         ppc_md.setup_arch     = apus_setup_arch;
 773         ppc_md.show_cpuinfo   = apus_show_cpuinfo;
 774         ppc_md.init_IRQ       = apus_init_IRQ;
 775         ppc_md.get_irq        = apus_get_irq;
 776
 777 #ifdef CONFIG_HEARTBEAT
 778         ppc_md.heartbeat      = apus_heartbeat;
 779         ppc_md.heartbeat_count = 1;
 780 #endif
 781 #ifdef APUS_DEBUG
 782         __debug_serinit();
 783         ppc_md.progress       = apus_progress;
 784 #endif
 785         ppc_md.init           = NULL;
 786
 787         ppc_md.restart        = apus_restart;
 788         ppc_md.power_off      = apus_power_off;
 789         ppc_md.halt           = apus_halt;
 790
 791         ppc_md.time_init      = NULL;
 792         ppc_md.set_rtc_time   = apus_set_rtc_time;
 793         ppc_md.get_rtc_time   = apus_get_rtc_time;
 794         ppc_md.calibrate_decr = apus_calibrate_decr;
 795
 796         ppc_md.find_end_of_memory = apus_find_end_of_memory;
 797         ppc_md.setup_io_mappings = apus_map_io;
 798 }