linux-old/include/asm-m68k/mac_via.h
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   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 doesn't cover this well
   7 */
   8 
   9#ifndef _ASM_MAC_VIA_H_
  10#define _ASM_MAC_VIA_H_
  11
  12/*
  13 * Base addresses for the VIAs. There are two in every machine,
  14 * although on some machines the second is an RBV or an OSS.
  15 * The OSS is different enough that it's handled separately.
  16 *
  17 * Do not use these values directly; use the via1 and via2 variables
  18 * instead (and don't forget to check rbv_present when using via2!)
  19 */
  20
  21#define VIA1_BASE       (0x50F00000)
  22#define VIA2_BASE       (0x50F02000)
  23#define  RBV_BASE       (0x50F26000)
  24 
  25/*
  26 *      Not all of these are true post MacII I think.
  27 *      CSA: probably the ones CHRP marks as 'unused' change purposes
  28 *      when the IWM becomes the SWIM.
  29 *      http://www.rs6000.ibm.com/resource/technology/chrpio/via5.mak.html
  30 *      ftp://ftp.austin.ibm.com/pub/technology/spec/chrp/inwork/CHRP_IORef_1.0.pdf
  31 *
  32 * also, http://developer.apple.com/technotes/hw/hw_09.html claims the
  33 * following changes for IIfx:
  34 * VIA1A_vSccWrReq not available and that VIA1A_vSync has moved to an IOP.
  35 * Also, "All of the functionality of VIA2 has been moved to other chips".
  36 */
  37 
  38#define VIA1A_vSccWrReq 0x80    /* SCC write. (input)
  39                                 * [CHRP] SCC WREQ: Reflects the state of the 
  40                                 * Wait/Request pins from the SCC.
  41                                 * [Macintosh Family Hardware]
  42                                 * as CHRP on SE/30,II,IIx,IIcx,IIci.
  43                                 * on IIfx, "0 means an active request"
  44                                 */
  45#define VIA1A_vRev8     0x40    /* Revision 8 board ???
  46                                 * [CHRP] En WaitReqB: Lets the WaitReq_L
  47                                 * signal from port B of the SCC appear on
  48                                 * the PA7 input pin. Output.
  49                                 * [Macintosh Family] On the SE/30, this
  50                                 * is the bit to flip screen buffers.
  51                                 * 0=alternate, 1=main.
  52                                 * on II,IIx,IIcx,IIci,IIfx this is a bit
  53                                 * for Rev ID. 0=II,IIx, 1=IIcx,IIci,IIfx
  54                                 */
  55#define VIA1A_vHeadSel  0x20    /* Head select for IWM.
  56                                 * [CHRP] unused.
  57                                 * [Macintosh Family] "Floppy disk
  58                                 * state-control line SEL" on all but IIfx
  59                                 */
  60#define VIA1A_vOverlay  0x10    /* [Macintosh Family] On SE/30,II,IIx,IIcx
  61                                 * this bit enables the "Overlay" address
  62                                 * map in the address decoders as it is on
  63                                 * reset for mapping the ROM over the reset
  64                                 * vector. 1=use overlay map.
  65                                 * On the IIci,IIfx it is another bit of the
  66                                 * CPU ID: 0=normal IIci, 1=IIci with parity
  67                                 * feature or IIfx.
  68                                 * [CHRP] En WaitReqA: Lets the WaitReq_L
  69                                 * signal from port A of the SCC appear
  70                                 * on the PA7 input pin (CHRP). Output.
  71                                 * [MkLinux] "Drive Select"
  72                                 *  (with 0x20 being 'disk head select')
  73                                 */
  74#define VIA1A_vSync     0x08    /* [CHRP] Sync Modem: modem clock select:
  75                                 * 1: select the external serial clock to
  76                                 *    drive the SCC's /RTxCA pin.
  77                                 * 0: Select the 3.6864MHz clock to drive
  78                                 *    the SCC cell.
  79                                 * [Macintosh Family] Correct on all but IIfx
  80                                 */
  81
  82/* Macintosh Family Hardware sez: bits 0-2 of VIA1A are volume control
  83 * on Macs which had the PWM sound hardware.  Reserved on newer models.
  84 * On IIci,IIfx, bits 1-2 are the rest of the CPU ID:
  85 * bit 2: 1=IIci, 0=IIfx
  86 * bit 1: 1 on both IIci and IIfx.
  87 * MkLinux sez bit 0 is 'burnin flag' in this case.
  88 * CHRP sez: VIA1A bits 0-2 and 5 are 'unused': if programmed as
  89 * inputs, these bits will read 0.
  90 */
  91#define VIA1A_vVolume   0x07    /* Audio volume mask for PWM */
  92#define VIA1A_CPUID0    0x02    /* CPU id bit 0 on RBV, others */
  93#define VIA1A_CPUID1    0x04    /* CPU id bit 0 on RBV, others */
  94#define VIA1A_CPUID2    0x10    /* CPU id bit 0 on RBV, others */
  95#define VIA1A_CPUID3    0x40    /* CPU id bit 0 on RBV, others */
  96        
  97/* Info on VIA1B is from Macintosh Family Hardware & MkLinux.
  98 * CHRP offers no info. */
  99#define VIA1B_vSound    0x80    /* Sound enable (for compatibility with
 100                                 * PWM hardware) 0=enabled.
 101                                 * Also, on IIci w/parity, shows parity error
 102                                 * 0=error, 1=OK. */
 103#define VIA1B_vMystery  0x40    /* On IIci, parity enable. 0=enabled,1=disabled
 104                                 * On SE/30, vertical sync interrupt enable.
 105                                 * 0=enabled. This vSync interrupt shows up
 106                                 * as a slot $E interrupt. */
 107#define VIA1B_vADBS2    0x20    /* ADB state input bit 1 (unused on IIfx) */
 108#define VIA1B_vADBS1    0x10    /* ADB state input bit 0 (unused on IIfx) */
 109#define VIA1B_vADBInt   0x08    /* ADB interrupt 0=interrupt (unused on IIfx)*/
 110#define VIA1B_vRTCEnb   0x04    /* Enable Real time clock. 0=enabled. */
 111#define VIA1B_vRTCClk   0x02    /* Real time clock serial-clock line. */
 112#define VIA1B_vRTCData  0x01    /* Real time clock serial-data line. */
 113
 114/* MkLinux defines the following "VIA1 Register B contents where they
 115 * differ from standard VIA1".  From the naming scheme, we assume they
 116 * correspond to a VIA work-alike named 'EVR'. */
 117#define EVRB_XCVR       0x08    /* XCVR_SESSION* */
 118#define EVRB_FULL       0x10    /* VIA_FULL */
 119#define EVRB_SYSES      0x20    /* SYS_SESSION */
 120#define EVRB_AUXIE      0x00    /* Enable A/UX Interrupt Scheme */
 121#define EVRB_AUXID      0x40    /* Disable A/UX Interrupt Scheme */
 122#define EVRB_SFTWRIE    0x00    /* Software Interrupt ReQuest */
 123#define EVRB_SFTWRID    0x80    /* Software Interrupt ReQuest */
 124
 125/*
 126 *      VIA2 A register is the interrupt lines raised off the nubus 
 127 *      slots.
 128 *      The below info is from 'Macintosh Family Hardware.'
 129 *      MkLinux calls the 'IIci internal video IRQ' below the 'RBV slot 0 irq.'
 130 *      It also notes that the slot $9 IRQ is the 'Ethernet IRQ' and
 131 *      defines the 'Video IRQ' as 0x40 for the 'EVR' VIA work-alike.
 132 *      Perhaps OSS uses vRAM1 and vRAM2 for ADB.
 133 */
 134 
 135#define VIA2A_vRAM1     0x80    /* RAM size bit 1 (IIci: reserved) */
 136#define VIA2A_vRAM0     0x40    /* RAM size bit 0 (IIci: internal video IRQ) */
 137#define VIA2A_vIRQE     0x20    /* IRQ from slot $E */
 138#define VIA2A_vIRQD     0x10    /* IRQ from slot $D */
 139#define VIA2A_vIRQC     0x08    /* IRQ from slot $C */
 140#define VIA2A_vIRQB     0x04    /* IRQ from slot $B */
 141#define VIA2A_vIRQA     0x02    /* IRQ from slot $A */
 142#define VIA2A_vIRQ9     0x01    /* IRQ from slot $9 */
 143
 144/* RAM size bits decoded as follows:
 145 * bit1 bit0  size of ICs in bank A
 146 *  0    0    256 kbit
 147 *  0    1    1 Mbit
 148 *  1    0    4 Mbit
 149 *  1    1   16 Mbit
 150 */
 151 
 152/*
 153 *      Register B has the fun stuff in it
 154 */
 155 
 156#define VIA2B_vVBL      0x80    /* VBL output to VIA1 (60.15Hz) driven by
 157                                 * timer T1.
 158                                 * on IIci, parity test: 0=test mode.
 159                                 * [MkLinux] RBV_PARODD: 1=odd,0=even. */
 160#define VIA2B_vSndJck   0x40    /* External sound jack status.
 161                                 * 0=plug is inserted.  On SE/30, always 0 */
 162#define VIA2B_vTfr0     0x20    /* Transfer mode bit 0 ack from NuBus */
 163#define VIA2B_vTfr1     0x10    /* Transfer mode bit 1 ack from NuBus */
 164#define VIA2B_vMode32   0x08    /* 24/32bit switch - doubles as cache flush
 165                                 * on II, AMU/PMMU control.
 166                                 *   if AMU, 0=24bit to 32bit translation
 167                                 *   if PMMU, 1=PMMU is accessing page table.
 168                                 * on SE/30 tied low.
 169                                 * on IIx,IIcx,IIfx, unused.
 170                                 * on IIci/RBV, cache control. 0=flush cache.
 171                                 */
 172#define VIA2B_vPower    0x04    /* Power off, 0=shut off power.
 173                                 * on SE/30 this signal sent to PDS card. */
 174#define VIA2B_vBusLk    0x02    /* Lock NuBus transactions, 0=locked.
 175                                 * on SE/30 sent to PDS card. */
 176#define VIA2B_vCDis     0x01    /* Cache control. On IIci, 1=disable cache card
 177                                 * on others, 0=disable processor's instruction
 178                                 * and data caches. */
 179
 180/* Apple sez: http://developer.apple.com/technotes/ov/ov_04.html
 181 * Another example of a valid function that has no ROM support is the use
 182 * of the alternate video page for page-flipping animation. Since there
 183 * is no ROM call to flip pages, it is necessary to go play with the
 184 * right bit in the VIA chip (6522 Versatile Interface Adapter).
 185 * [CSA: don't know which one this is, but it's one of 'em!]
 186 */
 187 
 188/*
 189 *      6522 registers - see databook.
 190 * CSA: Assignments for VIA1 confirmed from CHRP spec.
 191 */ 
 192
 193/* partial address decode.  0xYYXX : XX part for RBV, YY part for VIA */
 194/* Note: 15 VIA regs, 8 RBV regs */
 195
 196#define vBufB   0x0000  /* [VIA/RBV]  Register B */
 197#define vBufAH  0x0200  /* [VIA only] Buffer A, with handshake. DON'T USE! */
 198#define vDirB   0x0400  /* [VIA only] Data Direction Register B. */
 199#define vDirA   0x0600  /* [VIA only] Data Direction Register A. */
 200#define vT1CL   0x0800  /* [VIA only] Timer one counter low. */
 201#define vT1CH   0x0a00  /* [VIA only] Timer one counter high. */
 202#define vT1LL   0x0c00  /* [VIA only] Timer one latches low. */
 203#define vT1LH   0x0e00  /* [VIA only] Timer one latches high. */
 204#define vT2CL   0x1000  /* [VIA only] Timer two counter low. */
 205#define vT2CH   0x1200  /* [VIA only] Timer two counter high. */
 206#define vSR     0x1400  /* [VIA only] Shift register. */
 207#define vACR    0x1600  /* [VIA only] Auxilary control register. */
 208#define vPCR    0x1800  /* [VIA only] Peripheral control register. */
 209                        /*            CHRP sez never ever to *write* this.
 210                         *            Mac family says never to *change* this.
 211                         * In fact we need to initialize it once at start. */
 212#define vIFR    0x1a00  /* [VIA/RBV]  Interrupt flag register. */
 213#define vIER    0x1c00  /* [VIA/RBV]  Interrupt enable register. */
 214#define vBufA   0x1e00  /* [VIA/RBV] register A (no handshake) */
 215
 216/* The RBV only decodes the bottom eight address lines; the VIA doesn't
 217 * decode the bottom eight -- so vBufB | rBufB will always get you BufB */
 218/* CSA: in fact, only bits 0,1, and 4 seem to be decoded.
 219 * BUT note the values for rIER and rIFR, where the top 8 bits *do* seem
 220 * to matter.  In fact *all* of the top 8 bits seem to matter; 
 221 * setting rIER=0x1813 and rIFR=0x1803 doesn't work, either.
 222 * Perhaps some sort of 'compatibility mode' is built-in? [21-May-1999]
 223 */
 224
 225#define rBufB   0x0000  /* [VIA/RBV]  Register B */
 226#define rExp    0x0001  /* [RBV only] RBV future expansion (always 0) */
 227#define rSIFR   0x0002  /* [RBV only] RBV slot interrupts register. */
 228#define rIFR    0x1a03  /* [VIA/RBV]  RBV interrupt flag register. */
 229#define rMonP   0x0010  /* [RBV only] RBV video monitor type. */
 230#define rChpT   0x0011  /* [RBV only] RBV test mode register (reads as 0). */
 231#define rSIER   0x0012  /* [RBV only] RBV slot interrupt enables. */
 232#define rIER    0x1c13  /* [VIA/RBV]  RBV interrupt flag enable register. */
 233#define rBufA   rSIFR   /* the 'slot interrupts register' is BufA on a VIA */
 234
 235/*
 236 * Video monitor parameters, for rMonP:
 237 */
 238#define RBV_DEPTH  0x07 /* bits per pixel: 000=1,001=2,010=4,011=8 */
 239#define RBV_MONID  0x38 /* monitor type, as below. */
 240#define RBV_VIDOFF 0x40 /* 1 turns off onboard video */
 241/* Supported monitor types: */
 242#define MON_15BW   (1<<3) /* 15" BW portrait. */
 243#define MON_IIGS   (2<<3) /* 12" color (modified IIGS monitor). */
 244#define MON_15RGB  (5<<3) /* 15" RGB portrait. */
 245#define MON_12OR13 (6<<3) /* 12" BW or 13" RGB. */
 246#define MON_NONE   (7<<3) /* No monitor attached. */
 247
 248/* To clarify IER manipulations */
 249#define IER_SET_BIT(b) (0x80 | (1<<(b)) )
 250#define IER_CLR_BIT(b) (0x7F & (1<<(b)) )
 251
 252#ifndef __ASSEMBLY__
 253
 254extern volatile __u8 *via1,*via2;
 255extern int rbv_present,via_alt_mapping;
 256extern __u8 rbv_clear;
 257
 258static inline int rbv_set_video_bpp(int bpp)
 259{
 260        char val = (bpp==1)?0:(bpp==2)?1:(bpp==4)?2:(bpp==8)?3:-1;
 261        if (!rbv_present || val<0) return -1;
 262        via2[rMonP] = (via2[rMonP] & ~RBV_DEPTH) | val;
 263        return 0;
 264}
 265
 266#endif /* __ASSEMBLY__ */
 267
 268#endif /* _ASM_MAC_VIA_H_ */
 269
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