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; 256 257static inline int rbv_set_video_bpp(int bpp) 258{ 259 char val = (bpp==1)?0:(bpp==2)?1:(bpp==4)?2:(bpp==8)?3:-1; 260 if (!rbv_present || val<0) return -1; 261 via2[rMonP] = (via2[rMonP] & ~RBV_DEPTH) | val; 262 return 0; 263} 264 265#endif /* __ASSEMBLY__ */ 266 267#endif /* _ASM_MAC_VIA_H_ */ 268