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config.c

/*
 *  linux/arch/m68k/atari/config.c
 *
 *  Copyright (C) 1994 Bjoern Brauel
 *
 *  5/2/94 Roman Hodek:
 *    Added setting of time_adj to get a better clock.
 *
 *  5/14/94 Roman Hodek:
 *    gettod() for TT
 *
 *  5/15/94 Roman Hodek:
 *    hard_reset_now() for Atari (and others?)
 *
 *  94/12/30 Andreas Schwab:
 *    atari_sched_init fixed to get precise clock.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Miscellaneous atari stuff
 */

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/vt_kern.h>

#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stram.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/hwtest.h>
#include <asm/io.h>

u_long atari_mch_cookie;
u_long atari_mch_type;
struct atari_hw_present atari_hw_present;
u_long atari_switches;
int atari_dont_touch_floppy_select;
int atari_rtc_year_offset;

/* local function prototypes */
static void atari_reset(void);
static void atari_get_model(char *model);
static int atari_get_hardware_list(char *buffer);

/* atari specific irq functions */
extern void atari_init_IRQ (void);
extern void atari_mksound(unsigned int count, unsigned int ticks);
#ifdef CONFIG_HEARTBEAT
static void atari_heartbeat(int on);
#endif

/* atari specific timer functions (in time.c) */
extern void atari_sched_init(irq_handler_t);
extern unsigned long atari_gettimeoffset (void);
extern int atari_mste_hwclk (int, struct rtc_time *);
extern int atari_tt_hwclk (int, struct rtc_time *);
extern int atari_mste_set_clock_mmss (unsigned long);
extern int atari_tt_set_clock_mmss (unsigned long);


/* ++roman: This is a more elaborate test for an SCC chip, since the plain
 * Medusa board generates DTACK at the SCC's standard addresses, but a SCC
 * board in the Medusa is possible. Also, the addresses where the ST_ESCC
 * resides generate DTACK without the chip, too.
 * The method is to write values into the interrupt vector register, that
 * should be readable without trouble (from channel A!).
 */

static int __init scc_test(volatile char *ctla)
{
      if (!hwreg_present(ctla))
            return 0;
      MFPDELAY();

      *ctla = 2;
      MFPDELAY();
      *ctla = 0x40;
      MFPDELAY();

      *ctla = 2;
      MFPDELAY();
      if (*ctla != 0x40)
            return 0;
      MFPDELAY();

      *ctla = 2;
      MFPDELAY();
      *ctla = 0x60;
      MFPDELAY();

      *ctla = 2;
      MFPDELAY();
      if (*ctla != 0x60)
            return 0;

      return 1;
}


    /*
     *  Parse an Atari-specific record in the bootinfo
     */

int __init atari_parse_bootinfo(const struct bi_record *record)
{
      int unknown = 0;
      const u_long *data = record->data;

      switch (record->tag) {
      case BI_ATARI_MCH_COOKIE:
            atari_mch_cookie = *data;
            break;
      case BI_ATARI_MCH_TYPE:
            atari_mch_type = *data;
            break;
      default:
            unknown = 1;
            break;
      }
      return unknown;
}


/* Parse the Atari-specific switches= option. */
static int __init atari_switches_setup(char *str)
{
      char switches[strlen(str) + 1];
      char *p;
      int ovsc_shift;
      char *args = switches;

      if (!MACH_IS_ATARI)
            return 0;

      /* copy string to local array, strsep works destructively... */
      strcpy(switches, str);
      atari_switches = 0;

      /* parse the options */
      while ((p = strsep(&args, ",")) != NULL) {
            if (!*p)
                  continue;
            ovsc_shift = 0;
            if (strncmp(p, "ov_", 3) == 0) {
                  p += 3;
                  ovsc_shift = ATARI_SWITCH_OVSC_SHIFT;
            }

            if (strcmp(p, "ikbd") == 0) {
                  /* RTS line of IKBD ACIA */
                  atari_switches |= ATARI_SWITCH_IKBD << ovsc_shift;
            } else if (strcmp(p, "midi") == 0) {
                  /* RTS line of MIDI ACIA */
                  atari_switches |= ATARI_SWITCH_MIDI << ovsc_shift;
            } else if (strcmp(p, "snd6") == 0) {
                  atari_switches |= ATARI_SWITCH_SND6 << ovsc_shift;
            } else if (strcmp(p, "snd7") == 0) {
                  atari_switches |= ATARI_SWITCH_SND7 << ovsc_shift;
            }
      }
      return 0;
}

early_param("switches", atari_switches_setup);


    /*
     *  Setup the Atari configuration info
     */

void __init config_atari(void)
{
      unsigned short tos_version;

      memset(&atari_hw_present, 0, sizeof(atari_hw_present));

      /* Change size of I/O space from 64KB to 4GB. */
      ioport_resource.end  = 0xFFFFFFFF;

      mach_sched_init      = atari_sched_init;
      mach_init_IRQ        = atari_init_IRQ;
      mach_get_model     = atari_get_model;
      mach_get_hardware_list = atari_get_hardware_list;
      mach_gettimeoffset   = atari_gettimeoffset;
      mach_reset           = atari_reset;
      mach_max_dma_address = 0xffffff;
#if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
      mach_beep          = atari_mksound;
#endif
#ifdef CONFIG_HEARTBEAT
      mach_heartbeat = atari_heartbeat;
#endif

      /* Set switches as requested by the user */
      if (atari_switches & ATARI_SWITCH_IKBD)
            acia.key_ctrl = ACIA_DIV64 | ACIA_D8N1S | ACIA_RHTID;
      if (atari_switches & ATARI_SWITCH_MIDI)
            acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | ACIA_RHTID;
      if (atari_switches & (ATARI_SWITCH_SND6|ATARI_SWITCH_SND7)) {
            sound_ym.rd_data_reg_sel = 14;
            sound_ym.wd_data = sound_ym.rd_data_reg_sel |
                           ((atari_switches&ATARI_SWITCH_SND6) ? 0x40 : 0) |
                           ((atari_switches&ATARI_SWITCH_SND7) ? 0x80 : 0);
      }

      /* ++bjoern:
       * Determine hardware present
       */

      printk("Atari hardware found: ");
      if (MACH_IS_MEDUSA || MACH_IS_HADES) {
            /* There's no Atari video hardware on the Medusa, but all the
             * addresses below generate a DTACK so no bus error occurs! */
      } else if (hwreg_present(f030_xreg)) {
            ATARIHW_SET(VIDEL_SHIFTER);
            printk("VIDEL ");
            /* This is a temporary hack: If there is Falcon video
             * hardware, we assume that the ST-DMA serves SCSI instead of
             * ACSI. In the future, there should be a better method for
             * this...
             */
            ATARIHW_SET(ST_SCSI);
            printk("STDMA-SCSI ");
      } else if (hwreg_present(tt_palette)) {
            ATARIHW_SET(TT_SHIFTER);
            printk("TT_SHIFTER ");
      } else if (hwreg_present(&shifter.bas_hi)) {
            if (hwreg_present(&shifter.bas_lo) &&
                (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) {
                  ATARIHW_SET(EXTD_SHIFTER);
                  printk("EXTD_SHIFTER ");
            } else {
                  ATARIHW_SET(STND_SHIFTER);
                  printk("STND_SHIFTER ");
            }
      }
      if (hwreg_present(&mfp.par_dt_reg)) {
            ATARIHW_SET(ST_MFP);
            printk("ST_MFP ");
      }
      if (hwreg_present(&tt_mfp.par_dt_reg)) {
            ATARIHW_SET(TT_MFP);
            printk("TT_MFP ");
      }
      if (hwreg_present(&tt_scsi_dma.dma_addr_hi)) {
            ATARIHW_SET(SCSI_DMA);
            printk("TT_SCSI_DMA ");
      }
      if (!MACH_IS_HADES && hwreg_present(&st_dma.dma_hi)) {
            ATARIHW_SET(STND_DMA);
            printk("STND_DMA ");
      }
      /*
       * The ST-DMA address registers aren't readable
       * on all Medusas, so the test below may fail
       */
      if (MACH_IS_MEDUSA ||
          (hwreg_present(&st_dma.dma_vhi) &&
           (st_dma.dma_vhi = 0x55) && (st_dma.dma_hi = 0xaa) &&
           st_dma.dma_vhi == 0x55 && st_dma.dma_hi == 0xaa &&
           (st_dma.dma_vhi = 0xaa) && (st_dma.dma_hi = 0x55) &&
           st_dma.dma_vhi == 0xaa && st_dma.dma_hi == 0x55)) {
            ATARIHW_SET(EXTD_DMA);
            printk("EXTD_DMA ");
      }
      if (hwreg_present(&tt_scsi.scsi_data)) {
            ATARIHW_SET(TT_SCSI);
            printk("TT_SCSI ");
      }
      if (hwreg_present(&sound_ym.rd_data_reg_sel)) {
            ATARIHW_SET(YM_2149);
            printk("YM2149 ");
      }
      if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
            hwreg_present(&tt_dmasnd.ctrl)) {
            ATARIHW_SET(PCM_8BIT);
            printk("PCM ");
      }
      if (!MACH_IS_HADES && hwreg_present(&falcon_codec.unused5)) {
            ATARIHW_SET(CODEC);
            printk("CODEC ");
      }
      if (hwreg_present(&dsp56k_host_interface.icr)) {
            ATARIHW_SET(DSP56K);
            printk("DSP56K ");
      }
      if (hwreg_present(&tt_scc_dma.dma_ctrl) &&
#if 0
          /* This test sucks! Who knows some better? */
          (tt_scc_dma.dma_ctrl = 0x01, (tt_scc_dma.dma_ctrl & 1) == 1) &&
          (tt_scc_dma.dma_ctrl = 0x00, (tt_scc_dma.dma_ctrl & 1) == 0)
#else
          !MACH_IS_MEDUSA && !MACH_IS_HADES
#endif
          ) {
            ATARIHW_SET(SCC_DMA);
            printk("SCC_DMA ");
      }
      if (scc_test(&scc.cha_a_ctrl)) {
            ATARIHW_SET(SCC);
            printk("SCC ");
      }
      if (scc_test(&st_escc.cha_b_ctrl)) {
            ATARIHW_SET(ST_ESCC);
            printk("ST_ESCC ");
      }
      if (MACH_IS_HADES) {
            ATARIHW_SET(VME);
            printk("VME ");
      } else if (hwreg_present(&tt_scu.sys_mask)) {
            ATARIHW_SET(SCU);
            /* Assume a VME bus if there's a SCU */
            ATARIHW_SET(VME);
            printk("VME SCU ");
      }
      if (hwreg_present((void *)(0xffff9210))) {
            ATARIHW_SET(ANALOG_JOY);
            printk("ANALOG_JOY ");
      }
      if (!MACH_IS_HADES && hwreg_present(blitter.halftone)) {
            ATARIHW_SET(BLITTER);
            printk("BLITTER ");
      }
      if (hwreg_present((void *)0xfff00039)) {
            ATARIHW_SET(IDE);
            printk("IDE ");
      }
#if 1 /* This maybe wrong */
      if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
          hwreg_present(&tt_microwire.data) &&
          hwreg_present(&tt_microwire.mask) &&
          (tt_microwire.mask = 0x7ff,
           udelay(1),
           tt_microwire.data = MW_LM1992_PSG_HIGH | MW_LM1992_ADDR,
           udelay(1),
           tt_microwire.data != 0)) {
            ATARIHW_SET(MICROWIRE);
            while (tt_microwire.mask != 0x7ff)
                  ;
            printk("MICROWIRE ");
      }
#endif
      if (hwreg_present(&tt_rtc.regsel)) {
            ATARIHW_SET(TT_CLK);
            printk("TT_CLK ");
            mach_hwclk = atari_tt_hwclk;
            mach_set_clock_mmss = atari_tt_set_clock_mmss;
      }
      if (!MACH_IS_HADES && hwreg_present(&mste_rtc.sec_ones)) {
            ATARIHW_SET(MSTE_CLK);
            printk("MSTE_CLK ");
            mach_hwclk = atari_mste_hwclk;
            mach_set_clock_mmss = atari_mste_set_clock_mmss;
      }
      if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
          hwreg_present(&dma_wd.fdc_speed) &&
          hwreg_write(&dma_wd.fdc_speed, 0)) {
            ATARIHW_SET(FDCSPEED);
            printk("FDC_SPEED ");
      }
      if (!MACH_IS_HADES && !ATARIHW_PRESENT(ST_SCSI)) {
            ATARIHW_SET(ACSI);
            printk("ACSI ");
      }
      printk("\n");

      if (CPU_IS_040_OR_060)
            /* Now it seems to be safe to turn of the tt0 transparent
             * translation (the one that must not be turned off in
             * head.S...)
             */
            asm volatile ("\n"
                  "     moveq #0,%%d0\n"
                  "     .chip 68040\n"
                  "     movec %%d0,%%itt0\n"
                  "     movec %%d0,%%dtt0\n"
                  "     .chip 68k"
                  : /* no outputs */
                  : /* no inputs */
                  : "d0");

      /* allocator for memory that must reside in st-ram */
      atari_stram_init();

      /* Set up a mapping for the VMEbus address region:
       *
       * VME is either at phys. 0xfexxxxxx (TT) or 0xa00000..0xdfffff
       * (MegaSTE) In both cases, the whole 16 MB chunk is mapped at
       * 0xfe000000 virt., because this can be done with a single
       * transparent translation. On the 68040, lots of often unused
       * page tables would be needed otherwise. On a MegaSTE or similar,
       * the highest byte is stripped off by hardware due to the 24 bit
       * design of the bus.
       */

      if (CPU_IS_020_OR_030) {
            unsigned long tt1_val;
            tt1_val = 0xfe008543;   /* Translate 0xfexxxxxx, enable, cache
                               * inhibit, read and write, FDC mask = 3,
                               * FDC val = 4 -> Supervisor only */
            asm volatile ("\n"
                  "     .chip 68030\n"
                  "     pmove %0@,%/tt1\n"
                  "     .chip 68k"
                  : : "a" (&tt1_val));
      } else {
              asm volatile ("\n"
                  "     .chip 68040\n"
                  "     movec %0,%%itt1\n"
                  "     movec %0,%%dtt1\n"
                  "     .chip 68k"
                  :
                  : "d" (0xfe00a040));    /* Translate 0xfexxxxxx, enable,
                                     * supervisor only, non-cacheable/
                                     * serialized, writable */

      }

      /* Fetch tos version at Physical 2 */
      /*
       * We my not be able to access this address if the kernel is
       * loaded to st ram, since the first page is unmapped.  On the
       * Medusa this is always the case and there is nothing we can do
       * about this, so we just assume the smaller offset.  For the TT
       * we use the fact that in head.S we have set up a mapping
       * 0xFFxxxxxx -> 0x00xxxxxx, so that the first 16MB is accessible
       * in the last 16MB of the address space.
       */
      tos_version = (MACH_IS_MEDUSA || MACH_IS_HADES) ?
                  0xfff : *(unsigned short *)0xff000002;
      atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68;
}

#ifdef CONFIG_HEARTBEAT
static void atari_heartbeat(int on)
{
      unsigned char tmp;
      unsigned long flags;

      if (atari_dont_touch_floppy_select)
            return;

      local_irq_save(flags);
      sound_ym.rd_data_reg_sel = 14;      /* Select PSG Port A */
      tmp = sound_ym.rd_data_reg_sel;
      sound_ym.wd_data = on ? (tmp & ~0x02) : (tmp | 0x02);
      local_irq_restore(flags);
}
#endif

/* ++roman:
 *
 * This function does a reset on machines that lack the ability to
 * assert the processor's _RESET signal somehow via hardware. It is
 * based on the fact that you can find the initial SP and PC values
 * after a reset at physical addresses 0 and 4. This works pretty well
 * for Atari machines, since the lowest 8 bytes of physical memory are
 * really ROM (mapped by hardware). For other 680x0 machines: don't
 * know if it works...
 *
 * To get the values at addresses 0 and 4, the MMU better is turned
 * off first. After that, we have to jump into physical address space
 * (the PC before the pmove statement points to the virtual address of
 * the code). Getting that physical address is not hard, but the code
 * becomes a bit complex since I've tried to ensure that the jump
 * statement after the pmove is in the cache already (otherwise the
 * processor can't fetch it!). For that, the code first jumps to the
 * jump statement with the (virtual) address of the pmove section in
 * an address register . The jump statement is surely in the cache
 * now. After that, that physical address of the reset code is loaded
 * into the same address register, pmove is done and the same jump
 * statements goes to the reset code. Since there are not many
 * statements between the two jumps, I hope it stays in the cache.
 *
 * The C code makes heavy use of the GCC features that you can get the
 * address of a C label. No hope to compile this with another compiler
 * than GCC!
 */

/* ++andreas: no need for complicated code, just depend on prefetch */

static void atari_reset(void)
{
      long tc_val = 0;
      long reset_addr;

      /*
       * On the Medusa, phys. 0x4 may contain garbage because it's no
       * ROM.  See above for explanation why we cannot use PTOV(4).
       */
      reset_addr = MACH_IS_HADES ? 0x7fe00030 :
                 MACH_IS_MEDUSA || MACH_IS_AB40 ? 0xe00030 :
                 *(unsigned long *) 0xff000004;

      /* reset ACIA for switch off OverScan, if it's active */
      if (atari_switches & ATARI_SWITCH_OVSC_IKBD)
            acia.key_ctrl = ACIA_RESET;
      if (atari_switches & ATARI_SWITCH_OVSC_MIDI)
            acia.mid_ctrl = ACIA_RESET;

      /* processor independent: turn off interrupts and reset the VBR;
       * the caches must be left enabled, else prefetching the final jump
       * instruction doesn't work.
       */
      local_irq_disable();
      asm volatile ("movec    %0,%%vbr"
                  : : "d" (0));

      if (CPU_IS_040_OR_060) {
            unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040);
            if (CPU_IS_060) {
                  /* 68060: clear PCR to turn off superscalar operation */
                  asm volatile ("\n"
                        "     .chip 68060\n"
                        "     movec %0,%%pcr\n"
                        "     .chip 68k"
                        : : "d" (0));
            }

            asm volatile ("\n"
                  "     move.l      %0,%%d0\n"
                  "     and.l #0xff000000,%%d0\n"
                  "     or.w  #0xe020,%%d0\n"   /* map 16 MB, enable, cacheable */
                  "     .chip 68040\n"
                  "     movec %%d0,%%itt0\n"
                  "     movec %%d0,%%dtt0\n"
                  "     .chip 68k\n"
                  "     jmp   %0@"
                  : : "a" (jmp_addr040)
                  : "d0");
      jmp_addr_label040:
            asm volatile ("\n"
                  "     moveq #0,%%d0\n"
                  "     nop\n"
                  "     .chip 68040\n"
                  "     cinva %%bc\n"
                  "     nop\n"
                  "     pflusha\n"
                  "     nop\n"
                  "     movec %%d0,%%tc\n"
                  "     nop\n"
                  /* the following setup of transparent translations is needed on the
                   * Afterburner040 to successfully reboot. Other machines shouldn't
                   * care about a different tt regs setup, they also didn't care in
                   * the past that the regs weren't turned off. */
                  "     move.l      #0xffc000,%%d0\n" /* whole insn space cacheable */
                  "     movec %%d0,%%itt0\n"
                  "     movec %%d0,%%itt1\n"
                  "     or.w  #0x40,%/d0\n" /* whole data space non-cacheable/ser. */
                  "     movec %%d0,%%dtt0\n"
                  "     movec %%d0,%%dtt1\n"
                  "     .chip 68k\n"
                  "     jmp   %0@"
                  : /* no outputs */
                  : "a" (reset_addr)
                  : "d0");
      } else
            asm volatile ("\n"
                  "     pmove %0@,%%tc\n"
                  "     jmp   %1@"
                  : /* no outputs */
                  : "a" (&tc_val), "a" (reset_addr));
}


static void atari_get_model(char *model)
{
      strcpy(model, "Atari ");
      switch (atari_mch_cookie >> 16) {
      case ATARI_MCH_ST:
            if (ATARIHW_PRESENT(MSTE_CLK))
                  strcat(model, "Mega ST");
            else
                  strcat(model, "ST");
            break;
      case ATARI_MCH_STE:
            if (MACH_IS_MSTE)
                  strcat(model, "Mega STE");
            else
                  strcat(model, "STE");
            break;
      case ATARI_MCH_TT:
            if (MACH_IS_MEDUSA)
                  /* Medusa has TT _MCH cookie */
                  strcat(model, "Medusa");
            else if (MACH_IS_HADES)
                  strcat(model, "Hades");
            else
                  strcat(model, "TT");
            break;
      case ATARI_MCH_FALCON:
            strcat(model, "Falcon");
            if (MACH_IS_AB40)
                  strcat(model, " (with Afterburner040)");
            break;
      default:
            sprintf(model + strlen(model), "(unknown mach cookie 0x%lx)",
                  atari_mch_cookie);
            break;
      }
}


static int atari_get_hardware_list(char *buffer)
{
      int len = 0, i;

      for (i = 0; i < m68k_num_memory; i++)
            len += sprintf(buffer+len, "\t%3ld MB at 0x%08lx (%s)\n",
                        m68k_memory[i].size >> 20, m68k_memory[i].addr,
                        (m68k_memory[i].addr & 0xff000000 ?
                         "alternate RAM" : "ST-RAM"));

#define ATARIHW_ANNOUNCE(name, str)             \
      if (ATARIHW_PRESENT(name))                \
            len += sprintf(buffer + len, "\t%s\n", str)

      len += sprintf(buffer + len, "Detected hardware:\n");
      ATARIHW_ANNOUNCE(STND_SHIFTER, "ST Shifter");
      ATARIHW_ANNOUNCE(EXTD_SHIFTER, "STe Shifter");
      ATARIHW_ANNOUNCE(TT_SHIFTER, "TT Shifter");
      ATARIHW_ANNOUNCE(VIDEL_SHIFTER, "Falcon Shifter");
      ATARIHW_ANNOUNCE(YM_2149, "Programmable Sound Generator");
      ATARIHW_ANNOUNCE(PCM_8BIT, "PCM 8 Bit Sound");
      ATARIHW_ANNOUNCE(CODEC, "CODEC Sound");
      ATARIHW_ANNOUNCE(TT_SCSI, "SCSI Controller NCR5380 (TT style)");
      ATARIHW_ANNOUNCE(ST_SCSI, "SCSI Controller NCR5380 (Falcon style)");
      ATARIHW_ANNOUNCE(ACSI, "ACSI Interface");
      ATARIHW_ANNOUNCE(IDE, "IDE Interface");
      ATARIHW_ANNOUNCE(FDCSPEED, "8/16 Mhz Switch for FDC");
      ATARIHW_ANNOUNCE(ST_MFP, "Multi Function Peripheral MFP 68901");
      ATARIHW_ANNOUNCE(TT_MFP, "Second Multi Function Peripheral MFP 68901");
      ATARIHW_ANNOUNCE(SCC, "Serial Communications Controller SCC 8530");
      ATARIHW_ANNOUNCE(ST_ESCC, "Extended Serial Communications Controller SCC 85230");
      ATARIHW_ANNOUNCE(ANALOG_JOY, "Paddle Interface");
      ATARIHW_ANNOUNCE(MICROWIRE, "MICROWIRE(tm) Interface");
      ATARIHW_ANNOUNCE(STND_DMA, "DMA Controller (24 bit)");
      ATARIHW_ANNOUNCE(EXTD_DMA, "DMA Controller (32 bit)");
      ATARIHW_ANNOUNCE(SCSI_DMA, "DMA Controller for NCR5380");
      ATARIHW_ANNOUNCE(SCC_DMA, "DMA Controller for SCC");
      ATARIHW_ANNOUNCE(TT_CLK, "Clock Chip MC146818A");
      ATARIHW_ANNOUNCE(MSTE_CLK, "Clock Chip RP5C15");
      ATARIHW_ANNOUNCE(SCU, "System Control Unit");
      ATARIHW_ANNOUNCE(BLITTER, "Blitter");
      ATARIHW_ANNOUNCE(VME, "VME Bus");
      ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");

      return len;
}

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