1 /* 2 * Copyright (c) 1993 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * All advertising materials mentioning features or use of this software 10 * must display the following acknowledgement: 11 * This product includes software developed by the University of 12 * California, Lawrence Berkeley Laboratory. 13 * 14 * %sccs.include.redist.c% 15 * 16 * @(#)cgsixreg.h 8.1 (Berkeley) 10/30/93 17 * 18 * from: $Header: cgsixreg.h,v 1.1 93/10/12 15:29:24 torek Exp $ 19 */ 20 21 /* 22 * CG6 display registers. (Note, I got tired of writing `cgsix' about 23 * halfway through and changed everything to cg6, but I probably missed 24 * some. Unfortunately, the way config works, we need to spell out `six' 25 * in some places anyway.) 26 * 27 * The cg6 is a complicated beastie. We have been unable to extract any 28 * documentation and most of the following are guesses based on a limited 29 * amount of reverse engineering. 30 * 31 * A cg6 is composed of numerous groups of control registers, all with TLAs: 32 * FBC - frame buffer control? 33 * FHC - fbc hardware configuration? 34 * DHC - ??? 35 * TEC - transform engine control? 36 * THC - TEC Hardware Configuration (this is where our action goes) 37 * ROM - a 64Kbyte ROM with who knows what in it. 38 * colormap - see below 39 * frame buffer memory (video RAM) 40 * possible other stuff 41 * 42 * Like the cg3, the cg6 uses a Brooktree Video DAC (see btreg.h). 43 */ 44 45 /* 46 * The layout of the THC. 47 */ 48 struct cg6_thc { 49 u_int thc_xxx0[512]; /* ??? */ 50 u_int thc_hsync1; /* horizontal sync timing */ 51 u_int thc_hsync2; /* more hsync timing */ 52 u_int thc_hsync3; /* yet more hsync timing */ 53 u_int thc_vsync1; /* vertical sync timing */ 54 u_int thc_vsync2; /* only two of these */ 55 u_int thc_refresh; /* refresh counter */ 56 u_int thc_misc; /* miscellaneous control & status */ 57 u_int thc_xxx1[56]; /* ??? */ 58 u_int thc_cursxy; /* cursor x,y position (16 bits each) */ 59 u_int thc_cursmask[32]; /* cursor mask bits */ 60 u_int thc_cursbits[32]; /* what to show where mask enabled */ 61 }; 62 63 /* bits in thc_misc */ 64 #define THC_MISC_XXX0 0xfff00000 /* unused */ 65 #define THC_MISC_REVMASK 0x000f0000 /* cg6 revision? */ 66 #define THC_MISC_REVSHIFT 16 67 #define THC_MISC_XXX1 0x0000e000 /* unused */ 68 #define THC_MISC_RESET 0x00001000 /* ??? */ 69 #define THC_MISC_XXX2 0x00000800 /* unused */ 70 #define THC_MISC_VIDEN 0x00000400 /* video enable */ 71 #define THC_MISC_SYNC 0x00000200 /* not sure what ... */ 72 #define THC_MISC_VSYNC 0x00000100 /* ... these really are */ 73 #define THC_MISC_SYNCEN 0x00000080 /* sync enable */ 74 #define THC_MISC_CURSRES 0x00000040 /* cursor resolution */ 75 #define THC_MISC_INTEN 0x00000020 /* v.retrace intr enable */ 76 #define THC_MISC_INTR 0x00000010 /* intr pending / ack bit */ 77 #define THC_MISC_XXX 0x0000000f /* ??? */ 78 79 /* cursor x / y position value for `off' */ 80 #define THC_CURSOFF (65536-32) /* i.e., USHRT_MAX+1-32 */ 81 82 /* 83 * This structure exists only to compute the layout of the CG6 84 * hardware. Each of the individual substructures lives on a 85 * separate `page' (where a `page' is at least 4K), and many are 86 * very far apart. We avoid large offsets (which make for lousy 87 * code) by using pointers to the individual interesting pieces, 88 * and map them in independently (to avoid using up PTEs unnecessarily). 89 */ 90 struct cg6_layout { 91 /* ROM at 0 */ 92 union { 93 long un_id; /* ID = ?? */ 94 char un_rom[65536]; /* 64K rom */ 95 char un_pad[0x200000]; 96 } cg6_rom_un; 97 98 /* Brooktree DAC at 0x200000 */ 99 union { 100 struct bt_regs un_btregs; 101 char un_pad[0x040000]; 102 } cg6_bt_un; 103 104 /* DHC, whatever that is, at 0x240000 */ 105 union { 106 char un_pad[0x40000]; 107 } cg6_dhc_un; 108 109 /* ALT, whatever that is, at 0x280000 */ 110 union { 111 char un_pad[0x80000]; 112 } cg6_alt_un; 113 114 /* FHC, whatever that is, at 0x300000 */ 115 union { 116 char un_pad[0x1000]; 117 } cg6_fhc_un; 118 119 /* THC at 0x301000 */ 120 union { 121 struct cg6_thc un_thc; 122 char un_pad[0x400000 - 0x1000]; 123 } cg6_thc_un; 124 125 /* FBC at 0x700000 */ 126 union { 127 char un_pad[0x1000]; 128 } cg6_fbc_un; 129 130 /* TEC at 0x701000 */ 131 union { 132 char un_pad[0x100000 - 0x1000]; 133 } cg6_tec_un; 134 135 /* Video RAM at 0x800000 */ 136 char cg6_ram[1024 * 1024]; /* approx.? */ 137 }; 138