arch/m68k/mac/via6522.h

   1 /*
   2  *      6522 Versatile Interface Adapter (VIA)
   3  *
   4  *      There are two of these on the Mac II. Some IRQ's are vectored
   5  *      via them as are assorted bits and bobs - eg rtc, adb. The picture
   6  *      is a bit incomplete as the Mac documentation doesnt cover this well
   7  */
   8
   9 #ifndef _ASM_VIA6522_H_
  10 #define _ASM_VIA6522_H_
  11
  12 #define VIABASE         0x50F00000
  13 #define VIABASE2        0x50F02000
  14
  15 /*
  16  *      Not all of these are true post MacII I think
  17  */
  18
  19 #define VIA1A_vSccWrReq 0x80    /* SCC write */
  20 #define VIA1A_vRev8     0x40    /* Revision 8 board ??? */
  21 #define VIA1A_vHeadSel  0x20    /* Head select for IWM */
  22 #define VIA1A_vOverlay  0x10
  23 #define VIA1A_vSync     0x08
  24 #define VIA1A_vVolume   0x07    /* Audio volume mask */
  25
  26 #define VIA1B_vSound    0x80    /* Audio on/off */
  27 #define VIA1B_vMystery  0x40
  28 #define VIA1B_vADBS2    0x20    /* ADB state 2 */
  29 #define VIA1B_vADBS1    0x10    /* ADB state 1 */
  30 #define VIA1B_vADBInt   0x08    /* ADB interrupt */
  31 #define VIA1B_vRTCEnb   0x04    /* Real time clock */
  32 #define VIA1B_vRTCClk   0x02
  33 #define VIA1B_vRTCData  0x01
  34
  35 /*
  36  *      VIA2 A register is the interrupt lines raised off the nubus
  37  *      slots.
  38  */
  39
  40 #define VIA2A_vIRQE     0x20
  41 #define VIA2A_vIRQD     0x10
  42 #define VIA2A_vIRQC     0x08
  43 #define VIA2A_vIRQB     0x04
  44 #define VIA2A_vIRQA     0x02
  45 #define VIA2A_vIRQ9     0x01
  46
  47 /*
  48  *      Register B has the fun stuff in it
  49  */
  50
  51 #define VIA2B_vMode32   0x08    /* 24/32bit switch - doubles as cache flush */
  52 #define VIA2B_vPower    0x04    /* Off switch */
  53 #define VIA2B_vBusLk    0x02    /* Nubus in use ?? */
  54 #define VIA2B_vCDis     0x01    /* Cache disable */
  55
  56 /*
  57  *      The 6522 via is a 2MHz part, and needs a delay. MacOS seems to
  58  *      execute MOV (Ax),(Ax) for this... Oh and we can't use udelay
  59  *      here... see we need the via to calibrate the udelay loop ...
  60  */
  61
  62 extern volatile long *via_memory_bogon;
  63
  64 extern __inline__ void via_write(volatile unsigned char *via,int reg, int v)
  65 {
  66         *via_memory_bogon;
  67         *via_memory_bogon;
  68         *via_memory_bogon;
  69         via[reg]=v;
  70 }
  71
  72 extern __inline__ int via_read(volatile unsigned char *via,int reg)
  73 {
  74         *via_memory_bogon;
  75         *via_memory_bogon;
  76         *via_memory_bogon;
  77         return (int)via[reg];
  78 }
  79
  80 extern volatile unsigned char *via1,*via2;
  81
  82 /*
  83  *      6522 registers - see databook
  84  */
  85
  86 #define vBufB   0x0000
  87 #define vBufA   0x0200
  88 #define vDirB   0x0400
  89 #define vDirA   0x0600
  90 #define vT1CL   0x0800
  91 #define vT1CH   0x0a00
  92 #define vT1LL   0x0c00
  93 #define vT1LH   0x0e00
  94 #define vT2CL   0x1000
  95 #define vT2CH   0x1200
  96 #define vSR     0x1400
  97 #define vACR    0x1600
  98 #define vPCR    0x1800
  99 #define vIFR    0x1a00
 100 #define vIER    0x1c00
 101 #define vANH    0x1e00  /* register A (no shake) */
 102
 103 #define rBufB   0x00
 104 #define rBufA   0x02
 105 /*#define rIFR  0x03*/
 106 #define rIFR    0x1A03
 107 #define rVideo  0x10
 108 #define rSlot   0x12
 109 /*#define rIER  0x13*/
 110 #define rIER    0x1C13
 111 /*
 112 #define R_rIFR  0x03
 113 #define R_rIER  0x13
 114 #define W_rIFR  0x1A03
 115 #define W_rIER  0x1C13
 116 */
 117 /*
 118  *      VIA interrupt
 119  */
 120
 121 struct via_irq_tab
 122 {
 123         void (*vector[8])(int, void *, struct pt_regs *);
 124 };
 125
 126 extern void via1_irq(int, void *, struct pt_regs *);
 127 extern void via2_irq(int, void *, struct pt_regs *);
 128
 129 extern void via_setup_keyboard(void);
 130
 131 #endif /* _ASM_VIA6522_H_ */