|
@@ -70,3 +70,115 @@
|
|
|
* on the PA7 input pin (CHRP). Output.
|
|
|
* [MkLinux] "Drive Select"
|
|
|
* (with 0x20 being 'disk head select')
|
|
|
+ */
|
|
|
+#define VIA1A_vSync 0x08 /* [CHRP] Sync Modem: modem clock select:
|
|
|
+ * 1: select the external serial clock to
|
|
|
+ * drive the SCC's /RTxCA pin.
|
|
|
+ * 0: Select the 3.6864MHz clock to drive
|
|
|
+ * the SCC cell.
|
|
|
+ * [Macintosh Family] Correct on all but IIfx
|
|
|
+ */
|
|
|
+
|
|
|
+/* Macintosh Family Hardware sez: bits 0-2 of VIA1A are volume control
|
|
|
+ * on Macs which had the PWM sound hardware. Reserved on newer models.
|
|
|
+ * On IIci,IIfx, bits 1-2 are the rest of the CPU ID:
|
|
|
+ * bit 2: 1=IIci, 0=IIfx
|
|
|
+ * bit 1: 1 on both IIci and IIfx.
|
|
|
+ * MkLinux sez bit 0 is 'burnin flag' in this case.
|
|
|
+ * CHRP sez: VIA1A bits 0-2 and 5 are 'unused': if programmed as
|
|
|
+ * inputs, these bits will read 0.
|
|
|
+ */
|
|
|
+#define VIA1A_vVolume 0x07 /* Audio volume mask for PWM */
|
|
|
+#define VIA1A_CPUID0 0x02 /* CPU id bit 0 on RBV, others */
|
|
|
+#define VIA1A_CPUID1 0x04 /* CPU id bit 0 on RBV, others */
|
|
|
+#define VIA1A_CPUID2 0x10 /* CPU id bit 0 on RBV, others */
|
|
|
+#define VIA1A_CPUID3 0x40 /* CPU id bit 0 on RBV, others */
|
|
|
+
|
|
|
+/* Info on VIA1B is from Macintosh Family Hardware & MkLinux.
|
|
|
+ * CHRP offers no info. */
|
|
|
+#define VIA1B_vSound 0x80 /* Sound enable (for compatibility with
|
|
|
+ * PWM hardware) 0=enabled.
|
|
|
+ * Also, on IIci w/parity, shows parity error
|
|
|
+ * 0=error, 1=OK. */
|
|
|
+#define VIA1B_vMystery 0x40 /* On IIci, parity enable. 0=enabled,1=disabled
|
|
|
+ * On SE/30, vertical sync interrupt enable.
|
|
|
+ * 0=enabled. This vSync interrupt shows up
|
|
|
+ * as a slot $E interrupt. */
|
|
|
+#define VIA1B_vADBS2 0x20 /* ADB state input bit 1 (unused on IIfx) */
|
|
|
+#define VIA1B_vADBS1 0x10 /* ADB state input bit 0 (unused on IIfx) */
|
|
|
+#define VIA1B_vADBInt 0x08 /* ADB interrupt 0=interrupt (unused on IIfx)*/
|
|
|
+#define VIA1B_vRTCEnb 0x04 /* Enable Real time clock. 0=enabled. */
|
|
|
+#define VIA1B_vRTCClk 0x02 /* Real time clock serial-clock line. */
|
|
|
+#define VIA1B_vRTCData 0x01 /* Real time clock serial-data line. */
|
|
|
+
|
|
|
+/* MkLinux defines the following "VIA1 Register B contents where they
|
|
|
+ * differ from standard VIA1". From the naming scheme, we assume they
|
|
|
+ * correspond to a VIA work-alike named 'EVR'. */
|
|
|
+#define EVRB_XCVR 0x08 /* XCVR_SESSION* */
|
|
|
+#define EVRB_FULL 0x10 /* VIA_FULL */
|
|
|
+#define EVRB_SYSES 0x20 /* SYS_SESSION */
|
|
|
+#define EVRB_AUXIE 0x00 /* Enable A/UX Interrupt Scheme */
|
|
|
+#define EVRB_AUXID 0x40 /* Disable A/UX Interrupt Scheme */
|
|
|
+#define EVRB_SFTWRIE 0x00 /* Software Interrupt ReQuest */
|
|
|
+#define EVRB_SFTWRID 0x80 /* Software Interrupt ReQuest */
|
|
|
+
|
|
|
+/*
|
|
|
+ * VIA2 A register is the interrupt lines raised off the nubus
|
|
|
+ * slots.
|
|
|
+ * The below info is from 'Macintosh Family Hardware.'
|
|
|
+ * MkLinux calls the 'IIci internal video IRQ' below the 'RBV slot 0 irq.'
|
|
|
+ * It also notes that the slot $9 IRQ is the 'Ethernet IRQ' and
|
|
|
+ * defines the 'Video IRQ' as 0x40 for the 'EVR' VIA work-alike.
|
|
|
+ * Perhaps OSS uses vRAM1 and vRAM2 for ADB.
|
|
|
+ */
|
|
|
+
|
|
|
+#define VIA2A_vRAM1 0x80 /* RAM size bit 1 (IIci: reserved) */
|
|
|
+#define VIA2A_vRAM0 0x40 /* RAM size bit 0 (IIci: internal video IRQ) */
|
|
|
+#define VIA2A_vIRQE 0x20 /* IRQ from slot $E */
|
|
|
+#define VIA2A_vIRQD 0x10 /* IRQ from slot $D */
|
|
|
+#define VIA2A_vIRQC 0x08 /* IRQ from slot $C */
|
|
|
+#define VIA2A_vIRQB 0x04 /* IRQ from slot $B */
|
|
|
+#define VIA2A_vIRQA 0x02 /* IRQ from slot $A */
|
|
|
+#define VIA2A_vIRQ9 0x01 /* IRQ from slot $9 */
|
|
|
+
|
|
|
+/* RAM size bits decoded as follows:
|
|
|
+ * bit1 bit0 size of ICs in bank A
|
|
|
+ * 0 0 256 kbit
|
|
|
+ * 0 1 1 Mbit
|
|
|
+ * 1 0 4 Mbit
|
|
|
+ * 1 1 16 Mbit
|
|
|
+ */
|
|
|
+
|
|
|
+/*
|
|
|
+ * Register B has the fun stuff in it
|
|
|
+ */
|
|
|
+
|
|
|
+#define VIA2B_vVBL 0x80 /* VBL output to VIA1 (60.15Hz) driven by
|
|
|
+ * timer T1.
|
|
|
+ * on IIci, parity test: 0=test mode.
|
|
|
+ * [MkLinux] RBV_PARODD: 1=odd,0=even. */
|
|
|
+#define VIA2B_vSndJck 0x40 /* External sound jack status.
|
|
|
+ * 0=plug is inserted. On SE/30, always 0 */
|
|
|
+#define VIA2B_vTfr0 0x20 /* Transfer mode bit 0 ack from NuBus */
|
|
|
+#define VIA2B_vTfr1 0x10 /* Transfer mode bit 1 ack from NuBus */
|
|
|
+#define VIA2B_vMode32 0x08 /* 24/32bit switch - doubles as cache flush
|
|
|
+ * on II, AMU/PMMU control.
|
|
|
+ * if AMU, 0=24bit to 32bit translation
|
|
|
+ * if PMMU, 1=PMMU is accessing page table.
|
|
|
+ * on SE/30 tied low.
|
|
|
+ * on IIx,IIcx,IIfx, unused.
|
|
|
+ * on IIci/RBV, cache control. 0=flush cache.
|
|
|
+ */
|
|
|
+#define VIA2B_vPower 0x04 /* Power off, 0=shut off power.
|
|
|
+ * on SE/30 this signal sent to PDS card. */
|
|
|
+#define VIA2B_vBusLk 0x02 /* Lock NuBus transactions, 0=locked.
|
|
|
+ * on SE/30 sent to PDS card. */
|
|
|
+#define VIA2B_vCDis 0x01 /* Cache control. On IIci, 1=disable cache card
|
|
|
+ * on others, 0=disable processor's instruction
|
|
|
+ * and data caches. */
|
|
|
+
|
|
|
+/* Apple sez: http://developer.apple.com/technotes/ov/ov_04.html
|
|
|
+ * Another example of a valid function that has no ROM support is the use
|
|
|
+ * of the alternate video page for page-flipping animation. Since there
|
|
|
+ * is no ROM call to flip pages, it is necessary to go play with the
|
|
|
+ * right bit in the VIA chip (6522 Versatile Interface Adapter).
|