config.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

	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_gettod = atari_tt_gettod;
        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_gettod = atari_mste_gettod;
        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 ("moveq #0,%/d0\n\t"
                          ".chip 68040\n\t"
			  "movec %%d0,%%itt0\n\t"
			  "movec %%d0,%%dtt0\n\t"
			  ".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__ ( ".chip 68030\n\t"
				"pmove	%0@,%/tt1\n\t"
				".chip 68k"
				: : "a" (&tt1_val) );
    }
    else {
        __asm__ __volatile__
            ( "movel %0,%/d0\n\t"
	      ".chip 68040\n\t"
	      "movec %%d0,%%itt1\n\t"
	      "movec %%d0,%%dtt1\n\t"
	      ".chip 68k"
              :
              : "g" (0xfe00a040)	/* Translate 0xfexxxxxx, enable,
                                         * supervisor only, non-cacheable/
                                         * serialized, writable */
              : "d0" );

    }

    /* 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;
    
    save_flags(flags);
    cli();
    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);
    restore_flags(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. */
    cli();
    __asm__ __volatile__
	("moveq	#0,%/d0\n\t"
	 "movec	%/d0,%/vbr"
	 : : : "d0" );
    
    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__
		("moveq	#0,%/d0\n\t"
		 ".chip 68060\n\t"
		 "movec %%d0,%%pcr\n\t"
		 ".chip 68k"
		 : : : "d0" );
	}
	    
        __asm__ __volatile__
            ("movel    %0,%/d0\n\t"
             "andl     #0xff000000,%/d0\n\t"
             "orw      #0xe020,%/d0\n\t"   /* map 16 MB, enable, cacheable */
             ".chip 68040\n\t"
	     "movec    %%d0,%%itt0\n\t"
             "movec    %%d0,%%dtt0\n\t"
	     ".chip 68k\n\t"
             "jmp   %0@\n\t"
             : /* no outputs */
             : "a" (jmp_addr040)
             : "d0" );
      jmp_addr_label040:
        __asm__ __volatile__
          ("moveq #0,%/d0\n\t"
	   "nop\n\t"
	   ".chip 68040\n\t"
	   "cinva %%bc\n\t"
	   "nop\n\t"
	   "pflusha\n\t"
	   "nop\n\t"
	   "movec %%d0,%%tc\n\t"
	   "nop\n\t"
	   /* 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. */
	   "movel #0xffc000,%%d0\n\t" /* whole insn space cacheable */
	   "movec %%d0,%%itt0\n\t"
	   "movec %%d0,%%itt1\n\t"
	   "orw   #0x40,%/d0\n\t" /* whole data space non-cacheable/ser. */
	   "movec %%d0,%%dtt0\n\t"
	   "movec %%d0,%%dtt1\n\t"
	   ".chip 68k\n\t"
           "jmp %0@"
           : /* no outputs */
           : "a" (reset_addr)
           : "d0");
    }
    else
        __asm__ __volatile__
            ("pmove %0@,%/tc\n\t"
             "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);
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  tab-width: 8
 * End:
 */