269 lines
11 KiB
C
269 lines
11 KiB
C
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/*
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* 6522 Versatile Interface Adapter (VIA)
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*
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* There are two of these on the Mac II. Some IRQ's are vectored
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* via them as are assorted bits and bobs - eg rtc, adb. The picture
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* is a bit incomplete as the Mac documentation doesn't cover this well
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*/
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#ifndef _ASM_MAC_VIA_H_
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#define _ASM_MAC_VIA_H_
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/*
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* Base addresses for the VIAs. There are two in every machine,
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* although on some machines the second is an RBV or an OSS.
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* The OSS is different enough that it's handled separately.
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*
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* Do not use these values directly; use the via1 and via2 variables
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* instead (and don't forget to check rbv_present when using via2!)
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*/
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#define VIA1_BASE (0x50F00000)
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#define VIA2_BASE (0x50F02000)
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#define RBV_BASE (0x50F26000)
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/*
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* Not all of these are true post MacII I think.
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* CSA: probably the ones CHRP marks as 'unused' change purposes
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* when the IWM becomes the SWIM.
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* http://www.rs6000.ibm.com/resource/technology/chrpio/via5.mak.html
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* ftp://ftp.austin.ibm.com/pub/technology/spec/chrp/inwork/CHRP_IORef_1.0.pdf
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*
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* also, http://developer.apple.com/technotes/hw/hw_09.html claims the
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* following changes for IIfx:
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* VIA1A_vSccWrReq not available and that VIA1A_vSync has moved to an IOP.
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* Also, "All of the functionality of VIA2 has been moved to other chips".
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*/
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#define VIA1A_vSccWrReq 0x80 /* SCC write. (input)
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* [CHRP] SCC WREQ: Reflects the state of the
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* Wait/Request pins from the SCC.
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* [Macintosh Family Hardware]
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* as CHRP on SE/30,II,IIx,IIcx,IIci.
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* on IIfx, "0 means an active request"
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*/
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#define VIA1A_vRev8 0x40 /* Revision 8 board ???
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* [CHRP] En WaitReqB: Lets the WaitReq_L
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* signal from port B of the SCC appear on
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* the PA7 input pin. Output.
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* [Macintosh Family] On the SE/30, this
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* is the bit to flip screen buffers.
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* 0=alternate, 1=main.
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* on II,IIx,IIcx,IIci,IIfx this is a bit
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* for Rev ID. 0=II,IIx, 1=IIcx,IIci,IIfx
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*/
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#define VIA1A_vHeadSel 0x20 /* Head select for IWM.
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* [CHRP] unused.
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* [Macintosh Family] "Floppy disk
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* state-control line SEL" on all but IIfx
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*/
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#define VIA1A_vOverlay 0x10 /* [Macintosh Family] On SE/30,II,IIx,IIcx
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* this bit enables the "Overlay" address
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* map in the address decoders as it is on
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* reset for mapping the ROM over the reset
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* vector. 1=use overlay map.
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* On the IIci,IIfx it is another bit of the
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* CPU ID: 0=normal IIci, 1=IIci with parity
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* feature or IIfx.
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* [CHRP] En WaitReqA: Lets the WaitReq_L
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* signal from port A of the SCC appear
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* on the PA7 input pin (CHRP). Output.
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* [MkLinux] "Drive Select"
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* (with 0x20 being 'disk head select')
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*/
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#define VIA1A_vSync 0x08 /* [CHRP] Sync Modem: modem clock select:
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* 1: select the external serial clock to
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* drive the SCC's /RTxCA pin.
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* 0: Select the 3.6864MHz clock to drive
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* the SCC cell.
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* [Macintosh Family] Correct on all but IIfx
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*/
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/* Macintosh Family Hardware sez: bits 0-2 of VIA1A are volume control
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* on Macs which had the PWM sound hardware. Reserved on newer models.
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* On IIci,IIfx, bits 1-2 are the rest of the CPU ID:
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* bit 2: 1=IIci, 0=IIfx
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* bit 1: 1 on both IIci and IIfx.
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* MkLinux sez bit 0 is 'burnin flag' in this case.
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* CHRP sez: VIA1A bits 0-2 and 5 are 'unused': if programmed as
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* inputs, these bits will read 0.
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*/
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#define VIA1A_vVolume 0x07 /* Audio volume mask for PWM */
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#define VIA1A_CPUID0 0x02 /* CPU id bit 0 on RBV, others */
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#define VIA1A_CPUID1 0x04 /* CPU id bit 0 on RBV, others */
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#define VIA1A_CPUID2 0x10 /* CPU id bit 0 on RBV, others */
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#define VIA1A_CPUID3 0x40 /* CPU id bit 0 on RBV, others */
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/* Info on VIA1B is from Macintosh Family Hardware & MkLinux.
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* CHRP offers no info. */
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#define VIA1B_vSound 0x80 /* Sound enable (for compatibility with
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* PWM hardware) 0=enabled.
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* Also, on IIci w/parity, shows parity error
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* 0=error, 1=OK. */
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#define VIA1B_vMystery 0x40 /* On IIci, parity enable. 0=enabled,1=disabled
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* On SE/30, vertical sync interrupt enable.
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* 0=enabled. This vSync interrupt shows up
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* as a slot $E interrupt. */
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#define VIA1B_vADBS2 0x20 /* ADB state input bit 1 (unused on IIfx) */
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#define VIA1B_vADBS1 0x10 /* ADB state input bit 0 (unused on IIfx) */
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#define VIA1B_vADBInt 0x08 /* ADB interrupt 0=interrupt (unused on IIfx)*/
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#define VIA1B_vRTCEnb 0x04 /* Enable Real time clock. 0=enabled. */
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#define VIA1B_vRTCClk 0x02 /* Real time clock serial-clock line. */
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#define VIA1B_vRTCData 0x01 /* Real time clock serial-data line. */
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/* MkLinux defines the following "VIA1 Register B contents where they
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* differ from standard VIA1". From the naming scheme, we assume they
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* correspond to a VIA work-alike named 'EVR'. */
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#define EVRB_XCVR 0x08 /* XCVR_SESSION* */
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#define EVRB_FULL 0x10 /* VIA_FULL */
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#define EVRB_SYSES 0x20 /* SYS_SESSION */
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#define EVRB_AUXIE 0x00 /* Enable A/UX Interrupt Scheme */
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#define EVRB_AUXID 0x40 /* Disable A/UX Interrupt Scheme */
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#define EVRB_SFTWRIE 0x00 /* Software Interrupt ReQuest */
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#define EVRB_SFTWRID 0x80 /* Software Interrupt ReQuest */
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/*
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* VIA2 A register is the interrupt lines raised off the nubus
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* slots.
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* The below info is from 'Macintosh Family Hardware.'
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* MkLinux calls the 'IIci internal video IRQ' below the 'RBV slot 0 irq.'
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* It also notes that the slot $9 IRQ is the 'Ethernet IRQ' and
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* defines the 'Video IRQ' as 0x40 for the 'EVR' VIA work-alike.
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* Perhaps OSS uses vRAM1 and vRAM2 for ADB.
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*/
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#define VIA2A_vRAM1 0x80 /* RAM size bit 1 (IIci: reserved) */
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#define VIA2A_vRAM0 0x40 /* RAM size bit 0 (IIci: internal video IRQ) */
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#define VIA2A_vIRQE 0x20 /* IRQ from slot $E */
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#define VIA2A_vIRQD 0x10 /* IRQ from slot $D */
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#define VIA2A_vIRQC 0x08 /* IRQ from slot $C */
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#define VIA2A_vIRQB 0x04 /* IRQ from slot $B */
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#define VIA2A_vIRQA 0x02 /* IRQ from slot $A */
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#define VIA2A_vIRQ9 0x01 /* IRQ from slot $9 */
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/* RAM size bits decoded as follows:
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* bit1 bit0 size of ICs in bank A
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* 0 0 256 kbit
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* 0 1 1 Mbit
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* 1 0 4 Mbit
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* 1 1 16 Mbit
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*/
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/*
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* Register B has the fun stuff in it
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*/
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#define VIA2B_vVBL 0x80 /* VBL output to VIA1 (60.15Hz) driven by
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* timer T1.
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* on IIci, parity test: 0=test mode.
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* [MkLinux] RBV_PARODD: 1=odd,0=even. */
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#define VIA2B_vSndJck 0x40 /* External sound jack status.
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* 0=plug is inserted. On SE/30, always 0 */
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#define VIA2B_vTfr0 0x20 /* Transfer mode bit 0 ack from NuBus */
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#define VIA2B_vTfr1 0x10 /* Transfer mode bit 1 ack from NuBus */
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#define VIA2B_vMode32 0x08 /* 24/32bit switch - doubles as cache flush
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* on II, AMU/PMMU control.
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* if AMU, 0=24bit to 32bit translation
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* if PMMU, 1=PMMU is accessing page table.
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* on SE/30 tied low.
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* on IIx,IIcx,IIfx, unused.
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* on IIci/RBV, cache control. 0=flush cache.
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*/
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#define VIA2B_vPower 0x04 /* Power off, 0=shut off power.
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* on SE/30 this signal sent to PDS card. */
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#define VIA2B_vBusLk 0x02 /* Lock NuBus transactions, 0=locked.
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* on SE/30 sent to PDS card. */
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#define VIA2B_vCDis 0x01 /* Cache control. On IIci, 1=disable cache card
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* on others, 0=disable processor's instruction
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* and data caches. */
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/* Apple sez: http://developer.apple.com/technotes/ov/ov_04.html
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* Another example of a valid function that has no ROM support is the use
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* of the alternate video page for page-flipping animation. Since there
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* is no ROM call to flip pages, it is necessary to go play with the
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* right bit in the VIA chip (6522 Versatile Interface Adapter).
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* [CSA: don't know which one this is, but it's one of 'em!]
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*/
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/*
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* 6522 registers - see databook.
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* CSA: Assignments for VIA1 confirmed from CHRP spec.
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*/
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/* partial address decode. 0xYYXX : XX part for RBV, YY part for VIA */
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/* Note: 15 VIA regs, 8 RBV regs */
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#define vBufB 0x0000 /* [VIA/RBV] Register B */
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#define vBufAH 0x0200 /* [VIA only] Buffer A, with handshake. DON'T USE! */
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#define vDirB 0x0400 /* [VIA only] Data Direction Register B. */
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#define vDirA 0x0600 /* [VIA only] Data Direction Register A. */
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#define vT1CL 0x0800 /* [VIA only] Timer one counter low. */
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#define vT1CH 0x0a00 /* [VIA only] Timer one counter high. */
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#define vT1LL 0x0c00 /* [VIA only] Timer one latches low. */
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#define vT1LH 0x0e00 /* [VIA only] Timer one latches high. */
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#define vT2CL 0x1000 /* [VIA only] Timer two counter low. */
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#define vT2CH 0x1200 /* [VIA only] Timer two counter high. */
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#define vSR 0x1400 /* [VIA only] Shift register. */
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#define vACR 0x1600 /* [VIA only] Auxilary control register. */
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#define vPCR 0x1800 /* [VIA only] Peripheral control register. */
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/* CHRP sez never ever to *write* this.
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* Mac family says never to *change* this.
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* In fact we need to initialize it once at start. */
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#define vIFR 0x1a00 /* [VIA/RBV] Interrupt flag register. */
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#define vIER 0x1c00 /* [VIA/RBV] Interrupt enable register. */
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#define vBufA 0x1e00 /* [VIA/RBV] register A (no handshake) */
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/* The RBV only decodes the bottom eight address lines; the VIA doesn't
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* decode the bottom eight -- so vBufB | rBufB will always get you BufB */
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/* CSA: in fact, only bits 0,1, and 4 seem to be decoded.
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* BUT note the values for rIER and rIFR, where the top 8 bits *do* seem
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* to matter. In fact *all* of the top 8 bits seem to matter;
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* setting rIER=0x1813 and rIFR=0x1803 doesn't work, either.
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* Perhaps some sort of 'compatibility mode' is built-in? [21-May-1999]
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*/
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#define rBufB 0x0000 /* [VIA/RBV] Register B */
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#define rExp 0x0001 /* [RBV only] RBV future expansion (always 0) */
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#define rSIFR 0x0002 /* [RBV only] RBV slot interrupts register. */
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#define rIFR 0x1a03 /* [VIA/RBV] RBV interrupt flag register. */
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#define rMonP 0x0010 /* [RBV only] RBV video monitor type. */
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#define rChpT 0x0011 /* [RBV only] RBV test mode register (reads as 0). */
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#define rSIER 0x0012 /* [RBV only] RBV slot interrupt enables. */
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#define rIER 0x1c13 /* [VIA/RBV] RBV interrupt flag enable register. */
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#define rBufA rSIFR /* the 'slot interrupts register' is BufA on a VIA */
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/*
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* Video monitor parameters, for rMonP:
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*/
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#define RBV_DEPTH 0x07 /* bits per pixel: 000=1,001=2,010=4,011=8 */
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#define RBV_MONID 0x38 /* monitor type, as below. */
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#define RBV_VIDOFF 0x40 /* 1 turns off onboard video */
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/* Supported monitor types: */
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#define MON_15BW (1<<3) /* 15" BW portrait. */
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#define MON_IIGS (2<<3) /* 12" color (modified IIGS monitor). */
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#define MON_15RGB (5<<3) /* 15" RGB portrait. */
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#define MON_12OR13 (6<<3) /* 12" BW or 13" RGB. */
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#define MON_NONE (7<<3) /* No monitor attached. */
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/* To clarify IER manipulations */
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#define IER_SET_BIT(b) (0x80 | (1<<(b)) )
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#define IER_CLR_BIT(b) (0x7F & (1<<(b)) )
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#ifndef __ASSEMBLY__
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extern volatile __u8 *via1,*via2;
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extern int rbv_present,via_alt_mapping;
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extern __u8 rbv_clear;
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static inline int rbv_set_video_bpp(int bpp)
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{
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char val = (bpp==1)?0:(bpp==2)?1:(bpp==4)?2:(bpp==8)?3:-1;
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if (!rbv_present || val<0) return -1;
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via2[rMonP] = (via2[rMonP] & ~RBV_DEPTH) | val;
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return 0;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_MAC_VIA_H_ */
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