/* $NetBSD: vgavar.h,v 1.33 2015/01/14 17:45:27 chs Exp $ */

/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

#include <sys/callout.h>

#ifdef _KERNEL_OPT
#include "opt_vga.h"
#endif

struct vga_handle {
       struct pcdisplay_handle vh_ph;
       bus_space_handle_t vh_ioh_vga, vh_allmemh;
       int vh_mono;
};
#define vh_iot          vh_ph.ph_iot
#define vh_memt         vh_ph.ph_memt
#define vh_ioh_6845     vh_ph.ph_ioh_6845
#define vh_memh         vh_ph.ph_memh

struct vga_funcs {
       int (*vf_ioctl)(void *, u_long, void *, int, struct lwp *);
       paddr_t (*vf_mmap)(void *, off_t, int);
};

struct vga_config {
       struct vga_handle hdl;
       struct vga_softc *softc;

       int nscreens;
       LIST_HEAD(, vgascreen) screens;
       struct vgascreen *active; /* current display */
       const struct wsscreen_descr *currenttype;

       struct vgascreen *wantedscreen;
       void (*switchcb)(void *, int, int);
       void *switchcbarg;

       struct callout vc_switch_callout;
       int vc_quirks;
       int vc_type;
       const struct vga_funcs *vc_funcs;

       u_int8_t palette[256 * 3];
#ifndef VGA_RASTERCONSOLE
       int currentfontset1, currentfontset2;
       int vc_nfontslots;
       struct egavga_font *vc_fonts[8]; /* currently loaded */
       TAILQ_HEAD(, egavga_font) vc_fontlist; /* LRU queue */
#else
       int nfonts;
       LIST_HEAD(, vga_raster_font) vc_fontlist;
#endif /* !VGA_RASTERCONSOLE */
};

struct vga_softc {
       device_t sc_dev;
       struct vga_config *sc_vc;
};

static __inline u_int8_t        _vga_attr_read(struct vga_handle *, int);
static __inline void    _vga_attr_write(struct vga_handle *, int, u_int8_t);
static __inline u_int8_t        _vga_ts_read(struct vga_handle *, int);
static __inline void    _vga_ts_write(struct vga_handle *, int, u_int8_t);
static __inline u_int8_t        _vga_gdc_read(struct vga_handle *, int);
static __inline void    _vga_gdc_write(struct vga_handle *, int, u_int8_t);

#define vga_raw_read(vh, reg) \
   bus_space_read_1(vh->vh_iot, vh->vh_ioh_vga, reg)
#define vga_raw_write(vh, reg, value) \
   bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, reg, value)

#define vga_enable(vh) \
   vga_raw_write(vh, 0, 0x20)

#define vga_reset_state(vh) \
   (void) bus_space_read_1(vh->vh_iot, vh->vh_ioh_6845, 10)

static __inline u_int8_t
_vga_attr_read(struct vga_handle *vh, int reg)
{
       u_int8_t res;

       /* reset state */
       vga_reset_state(vh);

       vga_raw_write(vh, VGA_ATC_INDEX, reg);
       res = vga_raw_read(vh, VGA_ATC_DATAR);

       /* XXX unneeded? */
       vga_reset_state(vh);

       vga_enable(vh);

       return res;
}

static __inline void
_vga_attr_write(struct vga_handle *vh, int reg, u_int8_t val)
{

       vga_reset_state(vh);

       vga_raw_write(vh, VGA_ATC_INDEX, reg);
       vga_raw_write(vh, VGA_ATC_DATAW, val);

       /* XXX unneeded? */
       vga_reset_state(vh);

       vga_enable(vh);
}

static __inline u_int8_t
_vga_ts_read(struct vga_handle *vh, int reg)
{

       vga_raw_write(vh, VGA_TS_INDEX, reg);
       return vga_raw_read(vh, VGA_TS_DATA);
}

static __inline void
_vga_ts_write(struct vga_handle *vh, int reg, u_int8_t val)
{

       vga_raw_write(vh, VGA_TS_INDEX, reg);
       vga_raw_write(vh, VGA_TS_DATA, val);
}

static __inline u_int8_t
_vga_gdc_read(struct vga_handle *vh, int reg)
{

       vga_raw_write(vh, VGA_GDC_INDEX, reg);
       return vga_raw_read(vh, VGA_GDC_DATA);
}

static __inline void
_vga_gdc_write(struct vga_handle *vh, int reg, u_int8_t val)
{

       vga_raw_write(vh, VGA_GDC_INDEX, reg);
       vga_raw_write(vh, VGA_GDC_DATA, val);
}

#define vga_attr_read(vh, reg) \
       _vga_attr_read(vh, offsetof(struct reg_vgaattr, reg))
#define vga_attr_write(vh, reg, val) \
       _vga_attr_write(vh, offsetof(struct reg_vgaattr, reg), val)
#define vga_ts_read(vh, reg) \
       _vga_ts_read(vh, offsetof(struct reg_vgats, reg))
#define vga_ts_write(vh, reg, val) \
       _vga_ts_write(vh, offsetof(struct reg_vgats, reg), val)
#define vga_gdc_read(vh, reg) \
       _vga_gdc_read(vh, offsetof(struct reg_vgagdc, reg))
#define vga_gdc_write(vh, reg, val) \
       _vga_gdc_write(vh, offsetof(struct reg_vgagdc, reg), val)

#define vga_6845_read(vh, reg) \
       pcdisplay_6845_read(&(vh)->vh_ph, reg)
#define vga_6845_write(vh, reg, val) \
       pcdisplay_6845_write(&(vh)->vh_ph, reg, val)
#define _vga_6845_read(vh, reg) \
       _pcdisplay_6845_read(&(vh)->vh_ph, reg)
#define _vga_6845_write(vh, reg, val) \
       _pcdisplay_6845_write(&(vh)->vh_ph, reg, val)

int     vga_common_probe(bus_space_tag_t, bus_space_tag_t);
void    vga_common_attach(struct vga_softc *, bus_space_tag_t,
                         bus_space_tag_t, int, int, const struct vga_funcs *);
#define VGA_QUIRK_ONEFONT       0x01
#define VGA_QUIRK_NOFASTSCROLL  0x02
int     vga_is_console(bus_space_tag_t, int);

int     vga_cnattach(bus_space_tag_t, bus_space_tag_t, int, int);
int     vga_cndetach(void);

void    vga_resume(struct vga_softc *);

#ifndef VGA_RASTERCONSOLE
struct wsscreen_descr;
void    vga_loadchars(struct vga_handle *, int, int, int, int, const char *);
void    vga_readoutchars(struct vga_handle *, int, int, int, int, char *);
#ifdef VGA_CONSOLE_ATI_BROKEN_FONTSEL
void    vga_copyfont01(struct vga_handle *);
#endif
void    vga_setfontset(struct vga_handle *, int, int);
void    vga_setscreentype(struct vga_handle *, const struct wsscreen_descr *);
#else /* !VGA_RASTERCONSOLE */
void    vga_load_builtinfont(struct vga_handle *, u_int8_t *, int, int);
#endif /* !VGA_RASTERCONSOLE */
void    vga_reset(struct vga_handle *, void (*)(struct vga_handle *));
void    vga_initregs(struct vga_handle *);

extern int vga_no_builtinfont;

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