controlfb.h

  1/* SPDX-License-Identifier: GPL-2.0-or-later */
  2/*
  3 * controlfb_hw.h: Constants of all sorts for controlfb
  4 *
  5 * Copyright (C) 1998 Daniel Jacobowitz <dan@debian.org>
  6 *
  7 * Based on an awful lot of code, including:
  8 *
  9 * control.c: Console support for PowerMac "control" display adaptor.
 10 * Copyright (C) 1996 Paul Mackerras.
 11 *
 12 * The so far unpublished platinumfb.c
 13 * Copyright (C) 1998 Jon Howell
 14 */
 15
 16/*
 17 * Structure of the registers for the RADACAL colormap device.
 18 */
 19struct cmap_regs {
 20	unsigned char addr;	/* index for both cmap and misc registers */
 21	char pad1[15];
 22	unsigned char crsr;	/* cursor palette */
 23	char pad2[15];
 24	unsigned char dat;	/* RADACAL misc register data */
 25	char pad3[15];
 26	unsigned char lut;	/* cmap data */
 27	char pad4[15];
 28};
 29
 30/*
 31 * Structure of the registers for the "control" display adaptor.
 32 */
 33#define PAD(x)	char x[12]
 34
 35struct preg {			/* padded register */
 36	unsigned r;
 37	char pad[12];
 38};
 39
 40struct control_regs {
 41	struct preg vcount;	/* vertical counter */
 42	/* Vertical parameters are in units of 1/2 scan line */
 43	struct preg vswin;	/* between vsblank and vssync */
 44	struct preg vsblank;	/* vert start blank */
 45	struct preg veblank;	/* vert end blank (display start) */
 46	struct preg vewin;	/* between vesync and veblank */
 47	struct preg vesync;	/* vert end sync */
 48	struct preg vssync;	/* vert start sync */
 49	struct preg vperiod;	/* vert period */
 50	struct preg piped;	/* pipe delay hardware cursor */
 51	/* Horizontal params are in units of 2 pixels */
 52	struct preg hperiod;	/* horiz period - 2 */
 53	struct preg hsblank;	/* horiz start blank */
 54	struct preg heblank;	/* horiz end blank */
 55	struct preg hesync;	/* horiz end sync */
 56	struct preg hssync;	/* horiz start sync */
 57	struct preg heq;	/* half horiz sync len */
 58	struct preg hlfln;	/* half horiz period */
 59	struct preg hserr;	/* horiz period - horiz sync len */
 60	struct preg cnttst;
 61	struct preg ctrl;	/* display control */
 62	struct preg start_addr;	/* start address: 5 lsbs zero */
 63	struct preg pitch;	/* addrs diff between scan lines */
 64	struct preg mon_sense;	/* monitor sense bits */
 65	struct preg vram_attr;	/* enable vram banks */
 66	struct preg mode;
 67	struct preg rfrcnt;	/* refresh count */
 68	struct preg intr_ena;	/* interrupt enable */
 69	struct preg intr_stat;	/* interrupt status */
 70	struct preg res[5];
 71};
 72
 73struct control_regints {
 74	/* Vertical parameters are in units of 1/2 scan line */
 75	unsigned vswin;	/* between vsblank and vssync */
 76	unsigned vsblank;	/* vert start blank */
 77	unsigned veblank;	/* vert end blank (display start) */
 78	unsigned vewin;	/* between vesync and veblank */
 79	unsigned vesync;	/* vert end sync */
 80	unsigned vssync;	/* vert start sync */
 81	unsigned vperiod;	/* vert period */
 82	unsigned piped;		/* pipe delay hardware cursor */
 83	/* Horizontal params are in units of 2 pixels */
 84	/* Except, apparently, for hres > 1024 (or == 1280?) */
 85	unsigned hperiod;	/* horiz period - 2 */
 86	unsigned hsblank;	/* horiz start blank */
 87	unsigned heblank;	/* horiz end blank */
 88	unsigned hesync;	/* horiz end sync */
 89	unsigned hssync;	/* horiz start sync */
 90	unsigned heq;		/* half horiz sync len */
 91	unsigned hlfln;		/* half horiz period */
 92	unsigned hserr;		/* horiz period - horiz sync len */
 93};
 94	
 95/*
 96 * Dot clock rate is
 97 * 3.9064MHz * 2**clock_params[2] * clock_params[1] / clock_params[0].
 98 */
 99struct control_regvals {
100	unsigned regs[16];		/* for vswin .. hserr */
101	unsigned char mode;
102	unsigned char radacal_ctrl;
103	unsigned char clock_params[3];
104};
105
106#define CTRLFB_OFF 16	/* position of pixel 0 in frame buffer */
107
108
109/*
110 * Best cmode supported by control
111 */
112struct max_cmodes {
113	int m[2];	/* 0: 2MB vram, 1: 4MB vram */
114};
115
116/*
117 * Video modes supported by macmodes.c
118 */
119static struct max_cmodes control_mac_modes[] = {
120	{{-1,-1}},	/* 512x384, 60Hz interlaced (NTSC) */
121	{{-1,-1}},	/* 512x384, 60Hz */
122	{{-1,-1}},	/* 640x480, 50Hz interlaced (PAL) */
123	{{-1,-1}},	/* 640x480, 60Hz interlaced (NTSC) */
124	{{ 2, 2}},	/* 640x480, 60Hz (VGA) */
125	{{ 2, 2}},	/* 640x480, 67Hz */
126	{{-1,-1}},	/* 640x870, 75Hz (portrait) */
127	{{-1,-1}},	/* 768x576, 50Hz (PAL full frame) */
128	{{ 2, 2}},	/* 800x600, 56Hz */
129	{{ 2, 2}},	/* 800x600, 60Hz */
130	{{ 2, 2}},	/* 800x600, 72Hz */
131	{{ 2, 2}},	/* 800x600, 75Hz */
132	{{ 1, 2}},	/* 832x624, 75Hz */
133	{{ 1, 2}},	/* 1024x768, 60Hz */
134	{{ 1, 2}},	/* 1024x768, 70Hz (or 72Hz?) */
135	{{ 1, 2}},	/* 1024x768, 75Hz (VESA) */
136	{{ 1, 2}},	/* 1024x768, 75Hz */
137	{{ 1, 2}},	/* 1152x870, 75Hz */
138	{{ 0, 1}},	/* 1280x960, 75Hz */
139	{{ 0, 1}},	/* 1280x1024, 75Hz */
140	{{ 1, 2}},	/* 1152x768, 60Hz */
141	{{ 0, 1}},	/* 1600x1024, 60Hz */
142};
143