/*	$OpenBSD: grf.c,v 1.25 2003/09/23 16:51:11 millert Exp $	*/
/*	$NetBSD: grf.c,v 1.41 1997/02/24 06:20:04 scottr Exp $	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: Utah $Hdr: grf.c 1.31 91/01/21$
 *
 *	@(#)grf.c	7.8 (Berkeley) 5/7/91
 */

/*
 * Graphics display driver for the Macintosh.
 * This is the hardware-independent portion of the driver.
 * Hardware access is through the grfdev routines below.
 */

#include <sys/param.h>

#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/systm.h>

#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/grfioctl.h>

#include <miscfs/specfs/specdev.h>

#include <uvm/uvm.h>

#include "nubus.h"
#include "itevar.h"
#include "grfvar.h"

#include "grf.h"
#include "ite.h"

#if NITE == 0
#define	iteon(u,f)
#define	iteoff(u,f)
#endif

int	grfmatch(struct device *, void *, void *);
void	grfattach(struct device *, struct device *, void *);

struct cfdriver grf_cd = {
	NULL, "grf", DV_DULL
};

struct cfattach grf_ca = {
	sizeof(struct grf_softc), grfmatch, grfattach
};

#ifdef DEBUG
#define GDB_DEVNO	0x01
#define GDB_MMAP	0x02
#define GDB_IOMAP	0x04
#define GDB_LOCK	0x08
static int grfdebug = (GDB_DEVNO|GDB_MMAP|GDB_IOMAP|GDB_LOCK);
#endif

int
grfmatch(parent, vcf, aux)
	struct device *parent;
	void *vcf;
	void *aux;
{
	struct grfbus_attach_args *ga = aux;

	return (strcmp(ga->ga_name, "grf") == 0);
}

void
grfattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct grf_softc *sc = (struct grf_softc *)self;
	struct grfbus_attach_args *ga = aux;

	printf("\n");

	/* Load forwarded pointers. */
	sc->sc_grfmode = ga->ga_grfmode;
	sc->sc_slot = ga->ga_slot;
	sc->sc_mode = ga->ga_mode;
	sc->sc_phys = ga->ga_phys;

	sc->sc_flags = GF_ALIVE;	/* XXX bogus */

	/*
	 * Attach ite semantics to the grf.  Change the name, forward
	 * everything else.
	 */
	ga->ga_name = "ite";
	(void)config_found(self, ga, grfbusprint);
}

/*ARGSUSED*/
int
grfopen(dev, flag, mode, p)
	dev_t dev;
	int flag;
	int mode;
	struct proc *p;
{
	register struct grf_softc *gp;
	int unit;
	int error;

	unit = GRFUNIT(dev);
	gp = grf_cd.cd_devs[unit];

	if (unit >= grf_cd.cd_ndevs || (gp->sc_flags & GF_ALIVE) == 0)
		return (ENXIO);

	if ((gp->sc_flags & (GF_OPEN | GF_EXCLUDE)) == (GF_OPEN | GF_EXCLUDE))
		return (EBUSY);

	/*
	 * First open.
	 * XXX: always put in graphics mode.
	 */
	error = 0;
	if ((gp->sc_flags & GF_OPEN) == 0) {
		gp->sc_flags |= GF_OPEN;
		error = grfon(dev);
	}
	return (error);
}

/*ARGSUSED*/
int
grfclose(dev, flag, mode, p)
	dev_t dev;
	int flag;
	int mode;
	struct proc *p;
{
	register struct grf_softc *gp;

	gp = grf_cd.cd_devs[GRFUNIT(dev)];

	(void) grfoff(dev);
	gp->sc_flags &= GF_ALIVE;

	return (0);
}

/*ARGSUSED*/
int
grfioctl(dev, cmd, data, flag, p)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flag;
	struct proc *p;
{
	struct grf_softc *gp;
	struct grfmode *gm;
	int     error;
	int	unit = GRFUNIT(dev);

	gp = grf_cd.cd_devs[unit];
	gm = gp->sc_grfmode;
	error = 0;

	switch (cmd) {
	case GRFIOCGINFO: /* XXX - This should go away as soon as X and	*/
			  /*       dt are fixed to use GRFIOC*MODE*	*/
		{ struct grfinfo *g;
		  g = (struct grfinfo *) data;
		  bzero(data, sizeof(struct grfinfo));
		  g->gd_id = gm->mode_id;
		  g->gd_fbaddr = gm->fbbase;
		  g->gd_fbsize = gm->fbsize;
		  g->gd_colors = 1 << (u_int32_t) gm->psize;
		  g->gd_planes = gm->psize;
		  g->gd_fbwidth = g->gd_dwidth = gm->width;
		  g->gd_fbheight = g->gd_dheight = gm->height;
		  g->gd_fbrowbytes = gm->rowbytes;
		}
		break;

	case GRFIOCON:
		error = grfon(dev);
		break;
	case GRFIOCOFF:
		error = grfoff(dev);
		break;
	case GRFIOCMAP:
		error = grfmap(dev, (caddr_t *) data, p);
		break;
	case GRFIOCUNMAP:
		error = grfunmap(dev, *(caddr_t *) data, p);
		break;

	case GRFIOCGMODE:
		bcopy(gm, data, sizeof(struct grfmode));
		break;
	case GRFIOCGETMODE:
		error = (*gp->sc_mode)(gp, GM_CURRMODE, data);
		break;
	case GRFIOCSETMODE:
		error = (*gp->sc_mode)(gp, GM_NEWMODE, data);
		break;
	case GRFIOCLISTMODES:
		error = (*gp->sc_mode)(gp, GM_LISTMODES, data);
		break;

	default:
		error = EINVAL;
		break;
	}
	return (error);
}

/*ARGSUSED*/
int
grfpoll(dev, events, p)
	dev_t dev;
	int events;
	struct proc *p;
{
	/* always fails => never blocks */
	return (events & (POLLOUT | POLLWRNORM));
}

/*ARGSUSED*/
paddr_t
grfmmap(dev, off, prot)
	dev_t dev;
	off_t off;
	int prot;
{
	int     unit = GRFUNIT(dev);
	struct grf_softc *gp;

	gp = grf_cd.cd_devs[unit];
	return (grfaddr(gp, off));
}

int
grfon(dev)
	dev_t   dev;
{
	int     unit = GRFUNIT(dev);
	struct grf_softc *gp;

	gp = grf_cd.cd_devs[unit];

	/*
	 * XXX: iteoff call relies on devices being in same order
	 * as ITEs and the fact that iteoff only uses the minor part
	 * of the dev arg.
	 */
	iteoff(unit, 3);

	return (*gp->sc_mode) (gp, GM_GRFON, NULL);
}

int
grfoff(dev)
	dev_t   dev;
{
	int     unit = GRFUNIT(dev);
	struct grf_softc *gp;
	int     error;

	gp = grf_cd.cd_devs[unit];

	(void) grfunmap(dev, (caddr_t) 0, curproc);

	error = (*gp->sc_mode) (gp, GM_GRFOFF, NULL);

	/* XXX: see comment for iteoff above */
	iteon(unit, 2);

	return (error);
}

int
grfaddr(gp, off)
	struct grf_softc *gp;
	register int off;
{
	register struct grfmode *gm = gp->sc_grfmode;
	u_long	addr;

	if (off >= 0 && off < m68k_round_page(gm->fbsize + gm->fboff)) {
		addr = (u_long)(*gp->sc_phys)(gp, (vm_offset_t)gm->fbbase)+off;
		return m68k_btop(addr);
	}
	/* bogus */
	return (-1);
}

int
grfmap(dev, addrp, p)
	dev_t dev;
	caddr_t *addrp;
	struct proc *p;
{
	extern u_int32_t mac68k_vidphys;
	struct grf_softc *gp;
	struct specinfo si;
	struct vnode vn;
	int len, error;
	int flags;

	gp = grf_cd.cd_devs[GRFUNIT(dev)];
#ifdef DEBUG
	if (grfdebug & GDB_MMAP)
		printf("grfmap(%d): addr %p\n", p->p_pid, *addrp);
#endif
	len = m68k_round_page(gp->sc_grfmode->fbsize + gp->sc_grfmode->fboff);
	flags = MAP_SHARED | MAP_FIXED;

	if (gp->sc_slot == NULL)
		*addrp = (caddr_t) m68k_trunc_page(mac68k_vidphys);
	else
		*addrp = (caddr_t) m68k_trunc_page(
		    NUBUS_SLOT2PA(gp->sc_slot->slot));

	vn.v_type = VCHR;	/* XXX */
	vn.v_specinfo = &si;	/* XXX */
	vn.v_rdev = dev;	/* XXX */

	error = uvm_mmap(&p->p_vmspace->vm_map, (vm_offset_t *)addrp,
	    (vm_size_t)len, UVM_PROT_RW, UVM_PROT_RW, flags, (caddr_t)&vn, 0,
	    p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);

	/* Offset into page: */
	*addrp += (unsigned long) gp->sc_grfmode->fboff & 0xfff;

#ifdef DEBUG
	if (grfdebug & GDB_MMAP)
		printf("grfmap(%d): returning addr %p\n", p->p_pid, *addrp);
#endif

	return (error);
}

int
grfunmap(dev, addr, p)
	dev_t   dev;
	caddr_t addr;
	struct proc *p;
{
	struct grf_softc *gp;
	vm_size_t size;

	gp = grf_cd.cd_devs[GRFUNIT(dev)];

#ifdef DEBUG
	if (grfdebug & GDB_MMAP)
		printf("grfunmap(%d): dev %x addr %p\n", p->p_pid, dev, addr);
#endif

	if (addr == 0)
		return (EINVAL);/* XXX: how do we deal with this? */

	size = round_page(gp->sc_grfmode->fbsize);

	uvm_unmap(&p->p_vmspace->vm_map, (vm_offset_t)addr,
	    (vm_offset_t)addr + size);

	return (0);
}