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/*
 * linux/drivers/video/platinumfb-hw.c -- Frame buffer device for the
 * Platinum on-board video in PowerMac 7200s (and some clones based
 * on the same motherboard.)
 *
 *  Created 09 Feb 1998 by Jon Howell <jonh@cs.dartmouth.edu>
 *
 * Copyright (C) 1998 Jon Howell
 *
 *  based on drivers/macintosh/platinum.c: Console support
 * 	for PowerMac "platinum" display adaptor.
 *  Copyright (C) 1996 Paul Mackerras and Mark Abene.
 *
 *  based on skeletonfb.c:
 *  Created 28 Dec 1997 by Geert Uytterhoeven
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/*
 * Structure of the registers for the DACula colormap device.
 */
struct cmap_regs {
	unsigned char addr;
	char pad1[15];
	unsigned char d1;
	char pad2[15];
	unsigned char d2;
	char pad3[15];
	unsigned char lut;
	char pad4[15];
};

/*
 * Structure of the registers for the "platinum" display adaptor".
 */
struct preg {			/* padded register */
	unsigned r;			/* notice this is 32 bits. */
	char pad[12];
};

struct platinum_regs {
	struct preg reg[128];
};

/*
 * Register initialization tables for the platinum display.
 *
 * It seems that there are two different types of platinum display
 * out there.  Older ones use the values in clocksel[1], for which
 * the formula for the clock frequency seems to be
 *	F = 14.3MHz * c0 / (c1 & 0x1f) / (1 << (c1 >> 5))
 * Newer ones use the values in clocksel[0], for which the formula
 * seems to be
 *	F = 15MHz * c0 / ((c1 & 0x1f) + 2) / (1 << (c1 >> 5))
 */
struct platinum_regvals {
	int	fb_offset;
	int	pitch[3];
	unsigned regs[26];
	unsigned char offset[3];
	unsigned char mode[3];
	unsigned char dacula_ctrl[3];
	unsigned char clock_params[2][2];
};

#define DIV2	0x20
#define DIV4	0x40
#define DIV8	0x60
#define DIV16	0x80

/* 1280x1024, 75Hz (20) */
static struct platinum_regvals platinum_reg_init_20 = {
	0x5c00,
	{ 1312, 2592, 2592 },
	{ 0xffc, 4, 0, 0, 0, 0, 0x428, 0,
	  0, 0xb3, 0xd3, 0x12, 0x1a5, 0x23, 0x28, 0x2d,
	  0x5e, 0x19e, 0x1a4, 0x854, 0x852, 4, 9, 0x50,
	  0x850, 0x851 }, { 0x58, 0x5d, 0x5d },
	{ 0, 0xff, 0xff }, { 0x51, 0x55, 0x55 },
	{{ 45, 3 }, { 66, 7 }}
};

/* 1280x960, 75Hz (19) */
static struct platinum_regvals platinum_reg_init_19 = {
	0x5c00,
	{ 1312, 2592, 2592 },
	{ 0xffc, 4, 0, 0, 0, 0, 0x428, 0,
	  0, 0xb2, 0xd2, 0x12, 0x1a3, 0x23, 0x28, 0x2d,
	  0x5c, 0x19c, 0x1a2, 0x7d0, 0x7ce, 4, 9, 0x4c,
	  0x7cc, 0x7cd }, { 0x56, 0x5b, 0x5b },
	{ 0, 0xff, 0xff }, { 0x51, 0x55, 0x55 },
	{{ 42, 3 }, { 44, 5 }}
};

/* 1152x870, 75Hz (18) */
static struct platinum_regvals platinum_reg_init_18 = {
	0x11b0,
	{ 1184, 2336, 4640 },
	{ 0xff0, 4, 0, 0, 0, 0, 0x38f, 0,
	  0, 0x294, 0x16c, 0x20, 0x2d7, 0x3f, 0x49, 0x53,
	  0x82, 0x2c2, 0x2d6, 0x726, 0x724, 4, 9, 0x52,
	  0x71e, 0x722 }, { 0x74, 0x7c, 0x81 },