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 8.2 (Berkeley) 12/12/93 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 / control? register (32 bits) 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 * Various revisions of the cgsix have various hardware bugs. So far, 45 * we have only seen rev 1 & 2. 46 */ 47 48 /* bits in FHC register */ 49 #define FHC_FBID_MASK 0xff000000 /* bits 24..31 are frame buffer ID */ 50 #define FHC_FBID_SHIFT 24 51 #define FHC_REV_MASK 0x00f00000 /* bits 20..23 are revision */ 52 #define FHC_REV_SHIFT 20 53 #define FHC_FROP_DISABLE 0x00080000 /* disable fast/font? rasterops */ 54 #define FHC_ROW_DISABLE 0x00040000 /* ??? */ 55 #define FHC_SRC_DISABLE 0x00020000 /* ??? */ 56 #define FHC_DST_DISABLE 0x00010000 /* disable destination cache */ 57 #define FHC_RESET 0x00008000 /* ??? */ 58 #define FHC_XXX0 0x00004000 /* ??? */ 59 #define FHC_LEBO 0x00002000 /* set little endian byte order? */ 60 #define FHC_RES_MASK 0x00001800 /* bits 11&12 are resolution */ 61 #define FHC_RES_1024 0x00000000 /* res = 1024x768 */ 62 #define FHC_RES_1152 0x00000800 /* res = 1152x900 */ 63 #define FHC_RES_1280 0x00001000 /* res = 1280x1024 */ 64 #define FHC_RES_1600 0x00001800 /* res = 1600x1200 */ 65 #define FHC_CPU_MASK 0x00000600 /* bits 9&10 are cpu type */ 66 #define FHC_CPU_SPARC 0x00000000 /* cpu = sparc */ 67 #define FHC_CPU_68020 0x00000200 /* cpu = 68020 */ 68 #define FHC_CPU_386 0x00000400 /* cpu = 80386 */ 69 #define FHC_CPU_XXX 0x00000600 /* ??? */ 70 #define FHC_TEST 0x00000100 /* ??? test window ??? */ 71 #define FHC_TESTX_MASK 0x000000f0 /* bits 4..7 are test window X */ 72 #define FHC_TESTX_SHIFT 4 73 #define FHC_TESTY_MASK 0x0000000f /* bits 0..3 are test window Y */ 74 #define FHC_TESTY_SHIFT 0 75 76 /* 77 * The layout of the THC. 78 */ 79 struct cg6_thc { 80 u_int thc_xxx0[512]; /* ??? */ 81 u_int thc_hsync1; /* horizontal sync timing */ 82 u_int thc_hsync2; /* more hsync timing */ 83 u_int thc_hsync3; /* yet more hsync timing */ 84 u_int thc_vsync1; /* vertical sync timing */ 85 u_int thc_vsync2; /* only two of these */ 86 u_int thc_refresh; /* refresh counter */ 87 u_int thc_misc; /* miscellaneous control & status */ 88 u_int thc_xxx1[56]; /* ??? */ 89 u_int thc_cursxy; /* cursor x,y position (16 bits each) */ 90 u_int thc_cursmask[32]; /* cursor mask bits */ 91 u_int thc_cursbits[32]; /* what to show where mask enabled */ 92 }; 93 94 /* bits in thc_misc */ 95 #define THC_MISC_XXX0 0xfff00000 /* unused */ 96 #define THC_MISC_REVMASK 0x000f0000 /* cg6 revision? */ 97 #define THC_MISC_REVSHIFT 16 98 #define THC_MISC_XXX1 0x0000e000 /* unused */ 99 #define THC_MISC_RESET 0x00001000 /* ??? */ 100 #define THC_MISC_XXX2 0x00000800 /* unused */ 101 #define THC_MISC_VIDEN 0x00000400 /* video enable */ 102 #define THC_MISC_SYNC 0x00000200 /* not sure what ... */ 103 #define THC_MISC_VSYNC 0x00000100 /* ... these really are */ 104 #define THC_MISC_SYNCEN 0x00000080 /* sync enable */ 105 #define THC_MISC_CURSRES 0x00000040 /* cursor resolution */ 106 #define THC_MISC_INTEN 0x00000020 /* v.retrace intr enable */ 107 #define THC_MISC_INTR 0x00000010 /* intr pending / ack bit */ 108 #define THC_MISC_XXX 0x0000000f /* ??? */ 109 110 /* cursor x / y position value for `off' */ 111 #define THC_CURSOFF (65536-32) /* i.e., USHRT_MAX+1-32 */ 112 113 /* 114 * This structure exists only to compute the layout of the CG6 115 * hardware. Each of the individual substructures lives on a 116 * separate `page' (where a `page' is at least 4K), and many are 117 * very far apart. We avoid large offsets (which make for lousy 118 * code) by using pointers to the individual interesting pieces, 119 * and map them in independently (to avoid using up PTEs unnecessarily). 120 */ 121 struct cg6_layout { 122 /* ROM at 0 */ 123 union { 124 long un_id; /* ID = ?? */ 125 char un_rom[65536]; /* 64K rom */ 126 char un_pad[0x200000]; 127 } cg6_rom_un; 128 129 /* Brooktree DAC at 0x200000 */ 130 union { 131 struct bt_regs un_btregs; 132 char un_pad[0x040000]; 133 } cg6_bt_un; 134 135 /* DHC, whatever that is, at 0x240000 */ 136 union { 137 char un_pad[0x40000]; 138 } cg6_dhc_un; 139 140 /* ALT, whatever that is, at 0x280000 */ 141 union { 142 char un_pad[0x80000]; 143 } cg6_alt_un; 144 145 /* FHC register at 0x300000 */ 146 union { 147 int un_fhc; 148 char un_pad[0x1000]; 149 } cg6_fhc_un; 150 151 /* THC at 0x301000 */ 152 union { 153 struct cg6_thc un_thc; 154 char un_pad[0x400000 - 0x1000]; 155 } cg6_thc_un; 156 157 /* FBC at 0x700000 */ 158 union { 159 char un_pad[0x1000]; 160 } cg6_fbc_un; 161 162 /* TEC at 0x701000 */ 163 union { 164 char un_pad[0x100000 - 0x1000]; 165 } cg6_tec_un; 166 167 /* Video RAM at 0x800000 */ 168 char cg6_ram[1024 * 1024]; /* approx.? */ 169 }; 170