/* $NetBSD: vgavar.h,v 1.3 1999/01/13 16:48:58 drochner 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  Software.Distribution@CS.CMU.EDU
 *  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.
 */

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

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

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

	/* reset state */
	(void) bus_space_read_1(vh->vh_iot, vh->vh_ioh_6845, 10);

	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_ATC_INDEX, reg);
	res = bus_space_read_1(vh->vh_iot, vh->vh_ioh_vga, VGA_ATC_DATAR);

	/* reset state XXX unneeded? */
	(void) bus_space_read_1(vh->vh_iot, vh->vh_ioh_6845, 10);

	/* enable */
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, 0, 0x20);

	return (res);
}

static inline void _vga_attr_write(vh, reg, val)
	struct vga_handle *vh;
	int reg;
	u_int8_t val;
{
	/* reset state */
	(void) bus_space_read_1(vh->vh_iot, vh->vh_ioh_6845, 10);

	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_ATC_INDEX, reg);
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_ATC_DATAW, val);

	/* reset state XXX unneeded? */
	(void) bus_space_read_1(vh->vh_iot, vh->vh_ioh_6845, 10);

	/* enable */
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, 0, 0x20);
}

static inline u_int8_t _vga_ts_read(vh, reg)
	struct vga_handle *vh;
	int reg;
{
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_TS_INDEX, reg);
	return (bus_space_read_1(vh->vh_iot, vh->vh_ioh_vga, VGA_TS_DATA));
}

static inline void _vga_ts_write(vh, reg, val)
	struct vga_handle *vh;
	int reg;
	u_int8_t val;
{
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_TS_INDEX, reg);
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_TS_DATA, val);
}

static inline u_int8_t _vga_gdc_read(vh, reg)
	struct vga_handle *vh;
	int reg;
{
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_GDC_INDEX, reg);
	return (bus_space_read_1(vh->vh_iot, vh->vh_ioh_vga, VGA_GDC_DATA));
}

static inline void _vga_gdc_write(vh, reg, val)
	struct vga_handle *vh;
	int reg;
	u_int8_t val;
{
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, VGA_GDC_INDEX, reg);
	bus_space_write_1(vh->vh_iot, vh->vh_ioh_vga, 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)

int	vga_common_probe __P((bus_space_tag_t, bus_space_tag_t));
void	vga_common_attach __P((struct device *, bus_space_tag_t,
			       bus_space_tag_t, int));
int	vga_is_console __P((bus_space_tag_t, int));

int	vga_cnattach __P((bus_space_tag_t, bus_space_tag_t, int, int));

struct wsscreen_descr;
void vga_loadchars __P((struct vga_handle *, int, int, int, int, char *));
void vga_setfontset __P((struct vga_handle *, int, int));
void vga_setscreentype __P((struct vga_handle *,
			    const struct wsscreen_descr *));
