/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * controlfb_hw.h: Constants of all sorts for controlfb
 *
 * Copyright (C) 1998 Daniel Jacobowitz <dan@debian.org>
 *
 * Based on an awful lot of code, including:
 *
 * control.c: Console support for PowerMac "control" display adaptor.
 * Copyright (C) 1996 Paul Mackerras.
 *
 * The so far unpublished platinumfb.c
 * Copyright (C) 1998 Jon Howell
 */

/*
 * Structure of the registers for the RADACAL colormap device.
 */
struct cmap_regs {
        unsigned char addr;     /* index for both cmap and misc registers */
        char pad1[15];
        unsigned char crsr;     /* cursor palette */
        char pad2[15];
        unsigned char dat;      /* RADACAL misc register data */
        char pad3[15];
        unsigned char lut;      /* cmap data */
        char pad4[15];
};

/*
 * Structure of the registers for the "control" display adaptor.
 */
#define PAD(x)  char x[12]

struct preg {                   /* padded register */
        unsigned r;
        char pad[12];
};

struct control_regs {
        struct preg vcount;     /* vertical counter */
        /* Vertical parameters are in units of 1/2 scan line */
        struct preg vswin;      /* between vsblank and vssync */
        struct preg vsblank;    /* vert start blank */
        struct preg veblank;    /* vert end blank (display start) */
        struct preg vewin;      /* between vesync and veblank */
        struct preg vesync;     /* vert end sync */
        struct preg vssync;     /* vert start sync */
        struct preg vperiod;    /* vert period */
        struct preg piped;      /* pipe delay hardware cursor */
        /* Horizontal params are in units of 2 pixels */
        struct preg hperiod;    /* horiz period - 2 */
        struct preg hsblank;    /* horiz start blank */
        struct preg heblank;    /* horiz end blank */
        struct preg hesync;     /* horiz end sync */
        struct preg hssync;     /* horiz start sync */
        struct preg heq;        /* half horiz sync len */
        struct preg hlfln;      /* half horiz period */
        struct preg hserr;      /* horiz period - horiz sync len */
        struct preg cnttst;
        struct preg ctrl;       /* display control */
        struct preg start_addr; /* start address: 5 lsbs zero */
        struct preg pitch;      /* addrs diff between scan lines */
        struct preg mon_sense;  /* monitor sense bits */
        struct preg vram_attr;  /* enable vram banks */
        struct preg mode;
        struct preg rfrcnt;     /* refresh count */
        struct preg intr_ena;   /* interrupt enable */
        struct preg intr_stat;  /* interrupt status */
        struct preg res[5];
};

struct control_regints {
        /* Vertical parameters are in units of 1/2 scan line */
        unsigned vswin; /* between vsblank and vssync */
        unsigned vsblank;       /* vert start blank */
        unsigned veblank;       /* vert end blank (display start) */
        unsigned vewin; /* between vesync and veblank */
        unsigned vesync;        /* vert end sync */
        unsigned vssync;        /* vert start sync */
        unsigned vperiod;       /* vert period */
        unsigned piped;         /* pipe delay hardware cursor */
        /* Horizontal params are in units of 2 pixels */
        /* Except, apparently, for hres > 1024 (or == 1280?) */
        unsigned hperiod;       /* horiz period - 2 */
        unsigned hsblank;       /* horiz start blank */
        unsigned heblank;       /* horiz end blank */
        unsigned hesync;        /* horiz end sync */
        unsigned hssync;        /* horiz start sync */
        unsigned heq;           /* half horiz sync len */
        unsigned hlfln;         /* half horiz period */
        unsigned hserr;         /* horiz period - horiz sync len */
};
        
/*
 * Dot clock rate is
 * 3.9064MHz * 2**clock_params[2] * clock_params[1] / clock_params[0].
 */
struct control_regvals {
        unsigned regs[16];              /* for vswin .. hserr */
        unsigned char mode;
        unsigned char radacal_ctrl;
        unsigned char clock_params[3];
};

#define CTRLFB_OFF 16   /* position of pixel 0 in frame buffer */


/*
 * Best cmode supported by control
 */
struct max_cmodes {
        int m[2];       /* 0: 2MB vram, 1: 4MB vram */
};

/*
 * Video modes supported by macmodes.c
 */
static struct max_cmodes control_mac_modes[] = {
        {{-1,-1}},      /* 512x384, 60Hz interlaced (NTSC) */
        {{-1,-1}},      /* 512x384, 60Hz */
        {{-1,-1}},      /* 640x480, 50Hz interlaced (PAL) */
        {{-1,-1}},      /* 640x480, 60Hz interlaced (NTSC) */
        {{ 2, 2}},      /* 640x480, 60Hz (VGA) */
        {{ 2, 2}},      /* 640x480, 67Hz */
        {{-1,-1}},      /* 640x870, 75Hz (portrait) */
        {{-1,-1}},      /* 768x576, 50Hz (PAL full frame) */
        {{ 2, 2}},      /* 800x600, 56Hz */
        {{ 2, 2}},      /* 800x600, 60Hz */
        {{ 2, 2}},      /* 800x600, 72Hz */
        {{ 2, 2}},      /* 800x600, 75Hz */
        {{ 1, 2}},      /* 832x624, 75Hz */
        {{ 1, 2}},      /* 1024x768, 60Hz */
        {{ 1, 2}},      /* 1024x768, 70Hz (or 72Hz?) */
        {{ 1, 2}},      /* 1024x768, 75Hz (VESA) */
        {{ 1, 2}},      /* 1024x768, 75Hz */
        {{ 1, 2}},      /* 1152x870, 75Hz */
        {{ 0, 1}},      /* 1280x960, 75Hz */
        {{ 0, 1}},      /* 1280x1024, 75Hz */
        {{ 1, 2}},      /* 1152x768, 60Hz */
        {{ 0, 1}},      /* 1600x1024, 60Hz */
};