xref: /src/sys/dev/pci/tga.c

/* $NetBSD: tga.c,v 1.93 2024/02/09 22:08:36 andvar 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 (at) 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tga.c,v 1.93 2024/02/09 22:08:36 andvar Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/ioctl.h>

#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/pciio.h>
#include <dev/pci/tgareg.h>
#include <dev/pci/tgavar.h>
#include <dev/ic/bt485reg.h>
#include <dev/ic/bt485var.h>
#include <dev/ic/bt463reg.h>
#include <dev/ic/bt463var.h>
#include <dev/ic/ibm561var.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wscons_raster.h>
#include <dev/rasops/rasops.h>
#include <dev/wsfont/wsfont.h>
#include <dev/pci/wsdisplay_pci.h>

static int	tgamatch(device_t, cfdata_t, void *);
static void	tgaattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(tga, sizeof(struct tga_softc),
    tgamatch, tgaattach, NULL, NULL);

static void tga_init(bus_space_tag_t memt, pci_chipset_tag_t pc,
    pcitag_t tag, struct tga_devconfig *dc);

static int tga_matchcommon(bus_space_tag_t, pci_chipset_tag_t, pcitag_t);
static void tga_mapaddrs(bus_space_tag_t memt, pci_chipset_tag_t pc,
    pcitag_t, bus_size_t *pcisize, struct tga_devconfig *dc);
static unsigned int tga_getdotclock(struct tga_devconfig *dc);

static int tga_ioctl(void *, void *, u_long, void *, int, struct lwp *);
static paddr_t tga_mmap(void *, void *, off_t, int);
static void tga_copyrows(void *, int, int, int);
static void tga_copycols(void *, int, int, int, int);
static int tga_alloc_screen(void *, const struct wsscreen_descr *,
    void **, int *, int *, long *);
static void tga_free_screen(void *, void *);
static int tga_show_screen(void *, void *, int,
    void (*) (void *, int, int), void *);
static int tga_rop(struct rasops_info *, int, int, int, int, int,
    struct rasops_info *, int, int);
static int tga_rop_vtov(struct rasops_info *, int, int, int, int,
    int, struct rasops_info *, int, int);
static void tga_putchar(void *c, int row, int col, u_int uc, long attr);
static void tga_eraserows(void *, int, int, long);
static void tga_erasecols(void *, int, int, int, long);
static void tga2_init(struct tga_devconfig *);

static void tga_config_interrupts(device_t);

/* RAMDAC interface functions */
static int tga_sched_update(void *, void (*)(void *));
static void tga_ramdac_wr(void *, u_int, uint8_t);
static uint8_t tga_ramdac_rd(void *, u_int);
static void tga_bt463_wr(void *, u_int, uint8_t);
static uint8_t tga_bt463_rd(void *, u_int);
static void tga2_ramdac_wr(void *, u_int, uint8_t);
static uint8_t tga2_ramdac_rd(void *, u_int);

/* Interrupt handler */
static int tga_intr(void *);

struct tga_devconfig tga_console_dc;

/* The NULL entries will get filled in by rasops_init().
 * XXX and the non-NULL ones will be overwritten; reset after calling it.
 */
struct wsdisplay_emulops tga_emulops = {
	.cursor    = NULL,
	.mapchar   = NULL,
	.putchar   = tga_putchar,
	.copycols  = tga_copycols,
	.erasecols = tga_erasecols,
	.copyrows  = tga_copyrows,
	.eraserows = tga_eraserows,
	.allocattr = NULL,
	NULL,
};

struct wsscreen_descr tga_stdscreen = {
	.name = "std",
	.ncols = 0,
	.nrows = 0,	/* will be filled in -- XXX shouldn't, it's global */
	.textops = &tga_emulops,
	.fontwidth = 0,
	.fontheight = 0,
	.capabilities = WSSCREEN_REVERSE,
	.modecookie = NULL,
};

const struct wsscreen_descr *_tga_scrlist[] = {
	&tga_stdscreen,
	/* XXX other formats, graphics screen? */
};

struct wsscreen_list tga_screenlist = {
	sizeof(_tga_scrlist) / sizeof(struct wsscreen_descr *), _tga_scrlist
};

struct wsdisplay_accessops tga_accessops = {
	.ioctl        = tga_ioctl,
	.mmap         = tga_mmap,
	.alloc_screen = tga_alloc_screen,
	.free_screen  = tga_free_screen,
	.show_screen  = tga_show_screen,
	.load_font    = NULL,
	.pollc        = NULL,
	.scroll       = NULL,
};

static void	tga_blank(struct tga_devconfig *);
static void	tga_unblank(struct tga_devconfig *);

int
tga_cnmatch(bus_space_tag_t iot, bus_space_tag_t memt,
    pci_chipset_tag_t pc, pcitag_t tag)
{

	return tga_matchcommon(memt, pc, tag);
}

static int
tgamatch(device_t parent, cfdata_t match, void *aux)
{
	struct pci_attach_args *pa = aux;

	if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_DEC)
		return (0);

	switch (PCI_PRODUCT(pa->pa_id)) {
	case PCI_PRODUCT_DEC_21030:
	case PCI_PRODUCT_DEC_PBXGB:
		break;
	default:
		return 0;
	}

#if defined(__alpha__) || defined(arc)
	/* short-circuit the following test, as we
	 * already have the memory mapped and hence
	 * cannot perform it---and we are the console
	 * anyway.
	 */
	if (pa->pa_tag == tga_console_dc.dc_pcitag)
		return 10;
#endif
	return tga_matchcommon(pa->pa_memt, pa->pa_pc, pa->pa_tag);
}

static int
tga_matchcommon(bus_space_tag_t memt, pci_chipset_tag_t pc, pcitag_t tag)
{
	struct tga_devconfig tmp_dc;
	struct tga_devconfig *dc = &tmp_dc;
	bus_size_t pcisize;

	tga_mapaddrs(memt, pc, tag, &pcisize, dc);
	dc->dc_tga_type = tga_identify(dc);

	dc->dc_tgaconf = tga_getconf(dc->dc_tga_type);
	bus_space_unmap(memt, dc->dc_memh, pcisize);
	if (dc->dc_tgaconf)
		return 10;
	return 0;
}

static void
tga_mapaddrs(bus_space_tag_t memt, pci_chipset_tag_t pc, pcitag_t tag,
    bus_size_t *pcisize, struct tga_devconfig *dc)
{
	int flags;

	dc->dc_memt = memt;
	dc->dc_tgaconf = NULL;

	/* XXX magic number */
	if (pci_mapreg_info(pc, tag, 0x10,
	    PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT,
	    &dc->dc_pcipaddr, pcisize, &flags))
		panic("tga_mapaddrs: pci_mapreg_info() failed");
	if ((flags & BUS_SPACE_MAP_PREFETCHABLE) == 0)		/* XXX */
		panic("tga memory not prefetchable");

	if (bus_space_map(memt, dc->dc_pcipaddr, *pcisize,
	    BUS_SPACE_MAP_PREFETCHABLE | BUS_SPACE_MAP_LINEAR, &dc->dc_memh))
		panic("tga_mapaddrs: could not map TGA address space");
	dc->dc_vaddr = (vaddr_t)bus_space_vaddr(memt, dc->dc_memh);

	bus_space_subregion(dc->dc_memt, dc->dc_memh,
	    TGA_MEM_CREGS, TGA_CREGS_SIZE, &dc->dc_regs);
}

static void
tga_init(bus_space_tag_t memt, pci_chipset_tag_t pc, pcitag_t tag,
    struct tga_devconfig *dc)
{
	const struct tga_conf *tgac;
	struct rasops_info *rip;
	int cookie;
	bus_size_t pcisize;
	int i;

	dc->dc_pc = pc;
	dc->dc_pcitag = tag;
	tga_mapaddrs(memt, pc, tag, &pcisize, dc);
	dc->dc_tga_type = tga_identify(dc);
	tgac = dc->dc_tgaconf = tga_getconf(dc->dc_tga_type);
#if 0
	/* XXX on the Alpha, pcisize = 4 * cspace_size. */
	if (tgac->tgac_cspace_size != pcisize)			/* sanity */
		panic("tga_init: memory size mismatch?");
#endif

	switch (TGARREG(dc, TGA_REG_GREV) & 0xff) {
	case 0x01:
	case 0x02:
	case 0x03:
	case 0x04:
		dc->dc_tga2 = 0;
		break;
	case 0x20:
	case 0x21:
	case 0x22:
		dc->dc_tga2 = 1;
		break;
	default:
		panic("tga_init: TGA Revision not recognized");
	}

	if (dc->dc_tga2)
		tga2_init(dc);

	switch (TGARREG(dc, TGA_REG_VHCR) & 0x1ff) {		/* XXX */
	case 0:
		dc->dc_wid = 8192;
		break;

	case 1:
		dc->dc_wid = 8196;
		break;

	default:
		dc->dc_wid = (TGARREG(dc, TGA_REG_VHCR) & 0x1ff) * 4; /* XXX */
		break;
	}

	/*
	 * XXX XXX Turning off "odd" shouldn't be necessary,
	 * XXX XXX but I can't make X work with the weird size.
	 */
	if ((TGARREG(dc, TGA_REG_VHCR) & 0x00000001) != 0 &&	/* XXX */
	    (TGARREG(dc, TGA_REG_VHCR) & 0x80000000) != 0) {	/* XXX */
		TGAWREG(dc, TGA_REG_VHCR,
		    (TGARREG(dc, TGA_REG_VHCR) & ~0x80000001));
		dc->dc_wid -= 4;
	}

	dc->dc_rowbytes = dc->dc_wid * (dc->dc_tgaconf->tgac_phys_depth / 8);
	dc->dc_ht = (TGARREG(dc, TGA_REG_VVCR) & 0x7ff);	/* XXX */

	/* XXX this seems to be what DEC does */
	TGAWREG(dc, TGA_REG_CCBR, 0);
	TGAWREG(dc, TGA_REG_VVBR, 1);
	dc->dc_videobase = dc->dc_vaddr + tgac->tgac_dbuf[0] +
	    1 * tgac->tgac_vvbr_units;
	dc->dc_blanked = 1;
	tga_unblank(dc);

	/*
	 * Set all bits in the pixel mask, to enable writes to all pixels.
	 * It seems that the console firmware clears some of them
	 * under some circumstances, which causes cute vertical stripes.
	 */
	TGAWREG(dc, TGA_REG_GPXR_P, 0xffffffff);

	/* clear the screen */
	for (i = 0; i < dc->dc_ht * dc->dc_rowbytes; i += sizeof(uint32_t))
		*(uint32_t *)(dc->dc_videobase + i) = 0;

	/* Initialize rasops descriptor */
	rip = &dc->dc_rinfo;
	rip->ri_flg = RI_CENTER;
	rip->ri_depth = tgac->tgac_phys_depth;
	rip->ri_bits = (void *)dc->dc_videobase;
	rip->ri_width = dc->dc_wid;
	rip->ri_height = dc->dc_ht;
	rip->ri_stride = dc->dc_rowbytes;
	rip->ri_hw = dc;
	if (dc == &tga_console_dc)
		rip->ri_flg |= RI_NO_AUTO;

	if (tgac->tgac_phys_depth == 32) {
		rip->ri_rnum = 8;
		rip->ri_gnum = 8;
		rip->ri_bnum = 8;
		rip->ri_rpos = 16;
		rip->ri_gpos = 8;
		rip->ri_bpos = 0;
	}

	wsfont_init();
	/* prefer 8 pixel wide font */
	cookie = wsfont_find(NULL, 8, 0, 0, WSDISPLAY_FONTORDER_R2L,
	    WSDISPLAY_FONTORDER_L2R, WSFONT_FIND_BITMAP);
	if (cookie <= 0)
		cookie = wsfont_find(NULL, 0, 0, 0, WSDISPLAY_FONTORDER_R2L,
		    WSDISPLAY_FONTORDER_L2R, WSFONT_FIND_BITMAP);
	if (cookie <= 0) {
		printf("tga: no appropriate fonts.\n");
		return;
	}

	/* the accelerated tga_putchar() needs LSbit left */
	if (wsfont_lock(cookie, &rip->ri_font)) {
		printf("tga: couldn't lock font\n");
		return;
	}
	rip->ri_wsfcookie = cookie;

	rasops_init(rip, 34, 80);

	/* add our accelerated functions */
	/* XXX shouldn't have to do this; rasops should leave non-NULL
	 * XXX entries alone.
	 */
	rip->ri_ops.copyrows = tga_copyrows;
	rip->ri_ops.eraserows = tga_eraserows;
	rip->ri_ops.erasecols = tga_erasecols;
	rip->ri_ops.copycols = tga_copycols;
	rip->ri_ops.putchar = tga_putchar;

	tga_stdscreen.nrows = rip->ri_rows;
	tga_stdscreen.ncols = rip->ri_cols;
	tga_stdscreen.textops = &rip->ri_ops;
	tga_stdscreen.capabilities = rip->ri_caps;


	dc->dc_intrenabled = 0;
}

static void
tgaattach(device_t parent, device_t self, void *aux)
{
	struct pci_attach_args *pa = aux;
	struct tga_softc *sc = device_private(self);
	struct tga_devconfig *dc;
	struct wsemuldisplaydev_attach_args aa;
	pci_intr_handle_t intrh;
	const char *intrstr;
	uint8_t rev;
	int console;
	char intrbuf[PCI_INTRSTR_LEN];

	sc->sc_dev = self;

#if defined(__alpha__) || defined(arc)
	console = (pa->pa_tag == tga_console_dc.dc_pcitag);
#else
	console = 0;
#endif
	if (console) {
		sc->sc_dc = &tga_console_dc;
		sc->sc_dc->dc_rinfo.ri_flg &= ~RI_NO_AUTO;
		sc->nscreens = 1;
	} else {
		sc->sc_dc = malloc(sizeof(struct tga_devconfig), M_DEVBUF,
		    M_WAITOK|M_ZERO);
		tga_init(pa->pa_memt, pa->pa_pc, pa->pa_tag, sc->sc_dc);
	}
	if (sc->sc_dc->dc_vaddr == 0) {
		aprint_error(": couldn't map memory space; punt!\n");
		return;
	}

	/* XXX say what's going on. */
	intrstr = NULL;
	if (pci_intr_map(pa, &intrh)) {
		aprint_error(": couldn't map interrupt");
		return;
	}
	intrstr = pci_intr_string(pa->pa_pc, intrh, intrbuf, sizeof(intrbuf));
	sc->sc_intr = pci_intr_establish_xname(pa->pa_pc, intrh, IPL_TTY,
	    tga_intr, sc->sc_dc, device_xname(self));
	if (sc->sc_intr == NULL) {
		aprint_error(": couldn't establish interrupt");
		if (intrstr != NULL)
			aprint_error("at %s", intrstr);
		aprint_error("\n");
		return;
	}

	rev = PCI_REVISION(pa->pa_class);
	switch (rev) {
	case 0x1:
	case 0x2:
	case 0x3:
		aprint_normal(": DC21030 step %c", 'A' + rev - 1);
		break;
	case 0x20:
		aprint_normal(": TGA2 abstract software model");
		break;
	case 0x21:
	case 0x22:
		aprint_normal(": TGA2 pass %d", rev - 0x20);
		break;

	default:
		aprint_normal("unknown stepping (0x%x)", rev);
		break;
	}
	aprint_normal(", ");

	/*
	 * Get RAMDAC function vectors and call the RAMDAC functions
	 * to allocate its private storage and pass that back to us.
	 */

	dc = sc->sc_dc;
	dc->dc_ramdac_funcs = dc->dc_tgaconf->ramdac_funcs();
	if (!dc->dc_tga2) {
		if (dc->dc_tgaconf->ramdac_funcs == bt485_funcs)
			dc->dc_ramdac_cookie =
			    dc->dc_ramdac_funcs->ramdac_register(dc,
			    tga_sched_update, tga_ramdac_wr, tga_ramdac_rd);
		else
			dc->dc_ramdac_cookie =
			    dc->dc_ramdac_funcs->ramdac_register(dc,
			    tga_sched_update, tga_bt463_wr, tga_bt463_rd);
	} else {
		dc->dc_ramdac_cookie = dc->dc_ramdac_funcs->ramdac_register(dc,
		    tga_sched_update, tga2_ramdac_wr, tga2_ramdac_rd);

		/* XXX this is a bit of a hack, setting the dotclock here */
		if (dc->dc_tgaconf->ramdac_funcs != bt485_funcs)
			(*dc->dc_ramdac_funcs->ramdac_set_dotclock)
			    (dc->dc_ramdac_cookie, tga_getdotclock(dc));
	}

	/*
	 * Initialize the RAMDAC.  Initialization includes disabling
	 * cursor, setting a sane colormap, etc.  We presume that we've
	 * filled in the necessary dot clock for PowerStorm 4d20.
	 */
	(*dc->dc_ramdac_funcs->ramdac_init)(dc->dc_ramdac_cookie);
	TGAWREG(dc, TGA_REG_SISR, 0x00000001); /* XXX */

	if (dc->dc_tgaconf == NULL) {
		aprint_error("unknown board configuration\n");
		return;
	}
	aprint_normal("board type %s\n", dc->dc_tgaconf->tgac_name);
	aprint_normal_dev(self, "%d x %d, %dbpp, %s RAMDAC\n",
	    dc->dc_wid, dc->dc_ht,
	    dc->dc_tgaconf->tgac_phys_depth,
	    dc->dc_ramdac_funcs->ramdac_name);

	if (intrstr != NULL)
		aprint_normal_dev(self, "interrupting at %s\n",
		    intrstr);

	aa.console = console;
	aa.scrdata = &tga_screenlist;
	aa.accessops = &tga_accessops;
	aa.accesscookie = sc;

	config_found(self, &aa, wsemuldisplaydevprint, CFARGS_NONE);

	config_interrupts(self, tga_config_interrupts);
}

static void
tga_config_interrupts(device_t self)
{
	struct tga_softc *sc;

	sc = device_private(self);
	sc->sc_dc->dc_intrenabled = 1;
}

static int
tga_ioctl(void *v, void *vs, u_long cmd, void *data, int flag, struct lwp *l)
{
	struct tga_softc *sc = v;
	struct tga_devconfig *dc = sc->sc_dc;
	struct ramdac_funcs *dcrf = dc->dc_ramdac_funcs;
	struct ramdac_cookie *dcrc = dc->dc_ramdac_cookie;

	switch (cmd) {
	case WSDISPLAYIO_GTYPE:
		*(u_int *)data = WSDISPLAY_TYPE_TGA;
		return 0;

	case WSDISPLAYIO_GINFO:
#define	wsd_fbip ((struct wsdisplay_fbinfo *)data)
		wsd_fbip->height = sc->sc_dc->dc_ht;
		wsd_fbip->width = sc->sc_dc->dc_wid;
		wsd_fbip->depth = sc->sc_dc->dc_tgaconf->tgac_phys_depth;
#if 0
		wsd_fbip->cmsize = 256;		/* XXX ??? */
#else
		wsd_fbip->cmsize = 1024;	/* XXX ??? */
#endif
#undef wsd_fbip
		return 0;

	case WSDISPLAYIO_GETCMAP:
		return (*dcrf->ramdac_get_cmap)(dcrc,
		    (struct wsdisplay_cmap *)data);

	case WSDISPLAYIO_PUTCMAP:
		return (*dcrf->ramdac_set_cmap)(dcrc,
		    (struct wsdisplay_cmap *)data);

	case WSDISPLAYIO_SVIDEO:
		if (*(u_int *)data == WSDISPLAYIO_VIDEO_OFF)
			tga_blank(sc->sc_dc);
		else
			tga_unblank(sc->sc_dc);
		return 0;

	case WSDISPLAYIO_GVIDEO:
		*(u_int *)data = dc->dc_blanked ?
		    WSDISPLAYIO_VIDEO_OFF : WSDISPLAYIO_VIDEO_ON;
		return 0;

	case WSDISPLAYIO_GCURPOS:
		return (*dcrf->ramdac_get_curpos)(dcrc,
		    (struct wsdisplay_curpos *)data);

	case WSDISPLAYIO_SCURPOS:
		return (*dcrf->ramdac_set_curpos)(dcrc,
		    (struct wsdisplay_curpos *)data);

	case WSDISPLAYIO_GCURMAX:
		return (*dcrf->ramdac_get_curmax)(dcrc,
		    (struct wsdisplay_curpos *)data);

	case WSDISPLAYIO_GCURSOR:
		return (*dcrf->ramdac_get_cursor)(dcrc,
		    (struct wsdisplay_cursor *)data);

	case WSDISPLAYIO_SCURSOR:
		return (*dcrf->ramdac_set_cursor)(dcrc,
		    (struct wsdisplay_cursor *)data);

	case WSDISPLAYIO_LINEBYTES:
		*(u_int *)data = dc->dc_rowbytes;
		return 0;

	/* PCI config read/write passthrough. */
	case PCI_IOC_CFGREAD:
	case PCI_IOC_CFGWRITE:
		return pci_devioctl(dc->dc_pc, dc->dc_pcitag,
		    cmd, data, flag, l);

	case WSDISPLAYIO_GET_BUSID:
		return wsdisplayio_busid_pci(sc->sc_dev, dc->dc_pc,
		    dc->dc_pcitag, data);
	}
	return EPASSTHROUGH;
}

static int
tga_sched_update(void *v, void (*f)(void *))
{
	struct tga_devconfig *dc = v;

	if (dc->dc_intrenabled) {
		/*
		 * Arrange for f to be called at the next end-of-frame
		 * interrupt.
		 */
		dc->dc_ramdac_intr = f;
		TGAWREG(dc, TGA_REG_SISR, 0x00010000);
	} else {
		/* Spin until the end-of-frame, then call f */
		TGAWREG(dc, TGA_REG_SISR, 0x00010001);
		TGAREGWB(dc, TGA_REG_SISR, 1);
		while ((TGARREG(dc, TGA_REG_SISR) & 0x00000001) == 0)
			continue;
		f(dc->dc_ramdac_cookie);
		TGAWREG(dc, TGA_REG_SISR, 0x00000001);
		TGAREGWB(dc, TGA_REG_SISR, 1);
	}

	return 0;
}

static int
tga_intr(void *v)
{
	struct tga_devconfig *dc = v;
	struct ramdac_cookie *dcrc= dc->dc_ramdac_cookie;

	uint32_t reg;

	reg = TGARREG(dc, TGA_REG_SISR);
	if (( reg & 0x00010001) != 0x00010001) {
		/* Odd. We never set any of the other interrupt enables. */
		if ((reg & 0x1f) != 0) {
			/* Clear the mysterious pending interrupts. */
			TGAWREG(dc, TGA_REG_SISR, (reg & 0x1f));
			TGAREGWB(dc, TGA_REG_SISR, 1);
			/*
			 * This was our interrupt, even if we're puzzled
			 * as to why we got it.  Don't make the interrupt
			 * handler think it was a stray.
			 */
			return -1;
		} else {
			return 0;
		}
	}
	/* if we have something to do, do it */
	if (dc->dc_ramdac_intr) {
		dc->dc_ramdac_intr(dcrc);
		dc->dc_ramdac_intr = NULL;
	}
	TGAWREG(dc, TGA_REG_SISR, 0x00000001);
	TGAREGWB(dc, TGA_REG_SISR, 1);
	return 1;
}

static paddr_t
tga_mmap(void *v, void *vs, off_t offset, int prot)
{
	struct tga_softc *sc = v;

	if (offset >= sc->sc_dc->dc_tgaconf->tgac_cspace_size || offset < 0)
		return -1;

	return bus_space_mmap(sc->sc_dc->dc_memt, sc->sc_dc->dc_pcipaddr,
	    offset, prot, BUS_SPACE_MAP_LINEAR);
}

static int
tga_alloc_screen(void *v, const struct wsscreen_descr *type, void **cookiep,
    int *curxp, int *curyp, long *attrp)
{
	struct tga_softc *sc = v;
	long defattr;

	if (sc->nscreens > 0)
		return ENOMEM;

	*cookiep = &sc->sc_dc->dc_rinfo; /* one and only for now */
	*curxp = 0;
	*curyp = 0;
	sc->sc_dc->dc_rinfo.ri_ops.allocattr(&sc->sc_dc->dc_rinfo,
	    0, 0, 0, &defattr);
	*attrp = defattr;
	sc->nscreens++;
	return 0;
}

static void
tga_free_screen(void *v, void *cookie)
{
	struct tga_softc *sc = v;

	if (sc->sc_dc == &tga_console_dc)
		panic("tga_free_screen: console");

	sc->nscreens--;
}

static int
tga_show_screen(void *v, void *cookie, int waitok,
    void (*cb)(void *, int, int), void *cbarg)
{

	return 0;
}

int
tga_cnattach(bus_space_tag_t iot, bus_space_tag_t memt,
    pci_chipset_tag_t pc, int bus, int device, int function)
{
	struct tga_devconfig *dcp = &tga_console_dc;
	long defattr;

	tga_init(memt, pc, pci_make_tag(pc, bus, device, function), dcp);

	/* sanity checks */
	if (dcp->dc_vaddr == 0)
		panic("tga_console(%d, %d): couldn't map memory space",
		    device, function);
	if (dcp->dc_tgaconf == NULL)
		panic("tga_console(%d, %d): unknown board configuration",
		    device, function);

	/*
	 * Initialize the RAMDAC but DO NOT allocate any private storage.
	 * Initialization includes disabling cursor, setting a sane
	 * colormap, etc.  It will be reinitialized in tgaattach().
	 */
	if (dcp->dc_tga2) {
		if (dcp->dc_tgaconf->ramdac_funcs == bt485_funcs)
			bt485_cninit(dcp, tga_sched_update, tga2_ramdac_wr,
			    tga2_ramdac_rd);
		else
			ibm561_cninit(dcp, tga_sched_update, tga2_ramdac_wr,
			    tga2_ramdac_rd, tga_getdotclock(dcp));
	} else {
		if (dcp->dc_tgaconf->ramdac_funcs == bt485_funcs)
			bt485_cninit(dcp, tga_sched_update, tga_ramdac_wr,
			    tga_ramdac_rd);
		else {
			bt463_cninit(dcp, tga_sched_update, tga_bt463_wr,
			    tga_bt463_rd);
		}
	}
	dcp->dc_rinfo.ri_ops.allocattr(&dcp->dc_rinfo, 0, 0, 0, &defattr);
	wsdisplay_cnattach(&tga_stdscreen, &dcp->dc_rinfo, 0, 0, defattr);

	return 0;
}

/*
 * Functions to blank and unblank the display.
 */
static void
tga_blank(struct tga_devconfig *dc)
{

	if (!dc->dc_blanked) {
		dc->dc_blanked = 1;
		/* XXX */
		TGAWREG(dc, TGA_REG_VVVR,
		    TGARREG(dc, TGA_REG_VVVR) | VVR_BLANK);
	}
}

static void
tga_unblank(struct tga_devconfig *dc)
{

	if (dc->dc_blanked) {
		dc->dc_blanked = 0;
		/* XXX */
		TGAWREG(dc, TGA_REG_VVVR,
		    TGARREG(dc, TGA_REG_VVVR) & ~VVR_BLANK);
	}
}

/*
 * Functions to manipulate the built-in cursor handing hardware.
 */
int
tga_builtin_set_cursor(struct tga_devconfig *dc,
    struct wsdisplay_cursor *cursorp)
{
	struct ramdac_funcs *dcrf = dc->dc_ramdac_funcs;
	struct ramdac_cookie *dcrc = dc->dc_ramdac_cookie;
	uint8_t image[512];
	u_int count, v;
	int error;

	v = cursorp->which;
	if (v & WSDISPLAY_CURSOR_DOCMAP) {
		error = dcrf->ramdac_check_curcmap(dcrc, cursorp);
		if (error)
			return error;
	}
	if (v & WSDISPLAY_CURSOR_DOSHAPE) {
		if ((u_int)cursorp->size.x != 64 ||
		    (u_int)cursorp->size.y > 64)
			return EINVAL;
		/* The cursor is 2 bits deep, and there is no mask */
		count = (cursorp->size.y * 64 * 2) / NBBY;
		error = copyin(cursorp->image, image, count);
		if (error)
			return error;
	}
	if (v & WSDISPLAY_CURSOR_DOHOT)		/* not supported */
		return EINVAL;

	/* parameters are OK; do it */
	if (v & WSDISPLAY_CURSOR_DOCUR) {
		if (cursorp->enable)
			/* XXX */
			TGAWREG(dc, TGA_REG_VVVR,
			    TGARREG(dc, TGA_REG_VVVR) | 0x04);
		else
			/* XXX */
			TGAWREG(dc, TGA_REG_VVVR,
			    TGARREG(dc, TGA_REG_VVVR) & ~0x04);
	}
	if (v & WSDISPLAY_CURSOR_DOPOS) {
		TGAWREG(dc, TGA_REG_CXYR, ((cursorp->pos.y & 0xfff) << 12) |
		    (cursorp->pos.x & 0xfff));
	}
	if (v & WSDISPLAY_CURSOR_DOCMAP) {
		dcrf->ramdac_set_curcmap(dcrc, cursorp);
	}
	if (v & WSDISPLAY_CURSOR_DOSHAPE) {
		count = ((64 * 2) / NBBY) * cursorp->size.y;
		TGAWREG(dc, TGA_REG_CCBR,
		    (TGARREG(dc, TGA_REG_CCBR) & ~0xfc00) |
		     (cursorp->size.y << 10));
		memcpy((void *)(dc->dc_vaddr +
		    (TGARREG(dc, TGA_REG_CCBR) & 0x3ff)),
		    image, count);
	}
	return 0;
}

int
tga_builtin_get_cursor(struct tga_devconfig *dc,
    struct wsdisplay_cursor *cursorp)
{
	struct ramdac_funcs *dcrf = dc->dc_ramdac_funcs;
	struct ramdac_cookie *dcrc = dc->dc_ramdac_cookie;
	int count, error;

	cursorp->which = WSDISPLAY_CURSOR_DOALL &
	    ~(WSDISPLAY_CURSOR_DOHOT | WSDISPLAY_CURSOR_DOCMAP);
	cursorp->enable = (TGARREG(dc, TGA_REG_VVVR) & 0x04) != 0;
	cursorp->pos.x = TGARREG(dc, TGA_REG_CXYR) & 0xfff;
	cursorp->pos.y = (TGARREG(dc, TGA_REG_CXYR) >> 12) & 0xfff;
	cursorp->size.x = 64;
	cursorp->size.y = (TGARREG(dc, TGA_REG_CCBR) >> 10) & 0x3f;

	if (cursorp->image != NULL) {
		count = (cursorp->size.y * 64 * 2) / NBBY;
		error = copyout((char *)(dc->dc_vaddr +
		    (TGARREG(dc, TGA_REG_CCBR) & 0x3ff)),
		    cursorp->image, count);
		if (error)
			return error;
		/* No mask */
	}
	error = dcrf->ramdac_get_curcmap(dcrc, cursorp);
	return error;
}

int
tga_builtin_set_curpos(struct tga_devconfig *dc,
    struct wsdisplay_curpos *curposp)
{

	TGAWREG(dc, TGA_REG_CXYR,
	    ((curposp->y & 0xfff) << 12) | (curposp->x & 0xfff));
	return 0;
}

int
tga_builtin_get_curpos(struct tga_devconfig *dc,
    struct wsdisplay_curpos *curposp)
{

	curposp->x = TGARREG(dc, TGA_REG_CXYR) & 0xfff;
	curposp->y = (TGARREG(dc, TGA_REG_CXYR) >> 12) & 0xfff;
	return 0;
}

int
tga_builtin_get_curmax(struct tga_devconfig *dc,
    struct wsdisplay_curpos *curposp)
{

	curposp->x = curposp->y = 64;
	return 0;
}

/*
 * Copy columns (characters) in a row (line).
 */
static void
tga_copycols(void *id, int row, int srccol, int dstcol, int ncols)
{
	struct rasops_info *ri = id;
	int y, srcx, dstx, nx;

	y = ri->ri_font->fontheight * row;
	srcx = ri->ri_font->fontwidth * srccol;
	dstx = ri->ri_font->fontwidth * dstcol;
	nx = ri->ri_font->fontwidth * ncols;

	tga_rop(ri, dstx, y,
	    nx, ri->ri_font->fontheight, RAS_SRC,
	    ri, srcx, y);
}

/*
 * Copy rows (lines).
 */
static void
tga_copyrows(void *id, int srcrow, int dstrow, int nrows)
{
	struct rasops_info *ri = id;
	int srcy, dsty, ny;

	srcy = ri->ri_font->fontheight * srcrow;
	dsty = ri->ri_font->fontheight * dstrow;
	ny = ri->ri_font->fontheight * nrows;

	tga_rop(ri, 0, dsty,
	    ri->ri_emuwidth, ny, RAS_SRC,
	    ri, 0, srcy);
}

/* Do we need the src? */
static const int needsrc[16] =
    { 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0 };

/* A mapping between our API and the TGA card */
static const int map_rop[16] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6,
    0xe, 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf
};

/*
 *  Generic TGA raster op.
 *   This covers all possible raster ops, and
 *   clips the sizes and all of that.
 */
static int
tga_rop(struct rasops_info *dst, int dx, int dy, int w, int h, int rop,
    struct rasops_info *src, int sx, int sy)
{

	if (dst == NULL)
		return -1;
	if (needsrc[RAS_GETOP(rop)]) {
		if (src == NULL)
			return -1;	/* We want a src */
		/* Clip against src */
		if (sx < 0) {
			w += sx;
			sx = 0;
		}
		if (sy < 0) {
			h += sy;
			sy = 0;
		}
		if (sx + w > src->ri_emuwidth)
			w = src->ri_emuwidth - sx;
		if (sy + h > src->ri_emuheight)
			h = src->ri_emuheight - sy;
	} else {
		if (src != NULL)
			return -1;	/* We need no src */
	}
	/* Clip against dst.  We modify src regardless of using it,
	 * since it really doesn't matter.
	 */
	if (dx < 0) {
		w += dx;
		sx -= dx;
		dx = 0;
	}
	if (dy < 0) {
		h += dy;
		sy -= dy;
		dy = 0;
	}
	if (dx + w > dst->ri_emuwidth)
		w = dst->ri_emuwidth - dx;
	if (dy + h > dst->ri_emuheight)
		h = dst->ri_emuheight - dy;
	if (w <= 0 || h <= 0)
		return 0;	/* Vacuously true; */
	if (src == NULL) {
		/* XXX Punt! */
		return -1;
	}
	return tga_rop_vtov(dst, dx, dy, w, h, rop, src, sx, sy);
}



/*
 * Video to Video raster ops.
 * This function deals with all raster ops that have a src and dst
 * that are on the card.
 */
static int
tga_rop_vtov(struct rasops_info *dst, int dx, int dy, int w, int h, int rop,
    struct rasops_info *src, int sx, int sy)
{
	struct tga_devconfig *dc = dst->ri_hw;
	int srcb, dstb, tga_srcb, tga_dstb;
	int x, y, wb;
	int xstart, xdir;
	int ystart, yend, ydir, yinc;
	int xleft, lastx, lastleft;
	int offset = 1 * dc->dc_tgaconf->tgac_vvbr_units;

	/*
	 * I don't yet want to deal with unaligned guys, really.  And we don't
	 * deal with copies from one card to another.
	 */
	if (dx % 8 != 0 || sx % 8 != 0 || src != dst) {
		/* XXX Punt! */
		/* XXX should never happen, since it's only being used to
		 * XXX copy 8-pixel-wide characters.
		 */
		return -1;
	}

	srcb = sy * src->ri_stride + sx * (src->ri_depth / 8);
	dstb = dy * dst->ri_stride + dx * (dst->ri_depth / 8);
	tga_srcb = offset + (sy + src->ri_yorigin) * src->ri_stride +
	    (sx + src->ri_xorigin) * (src->ri_depth / 8);
	tga_dstb = offset + (dy + dst->ri_yorigin) * dst->ri_stride +
	    (dx + dst->ri_xorigin) * (dst->ri_depth / 8);

	if (sy >= dy) {
		ystart = 0;
		yend = (h - 1) * dst->ri_stride;
		ydir = 1;
	} else {
		ystart = (h - 1) * dst->ri_stride;
		yend = 0;
		ydir = -1;
	}
	yinc = ydir * dst->ri_stride;

        wb = w * (dst->ri_depth / 8);
	if (sx >= dx || (sx + w) <= dx) {	/* copy forwards */
		xstart = 0;
		xdir = 1;
	} else {				/* copy backwards */
		xstart = wb;
		xdir = -1;
	}

	TGAWALREG(dc, TGA_REG_GMOR, 3, 0x0007);		/* Copy mode */
	TGAWALREG(dc, TGA_REG_GOPR, 3, map_rop[rop]);   /* Set up the op */
	TGAWALREG(dc, TGA_REG_GPSR, 3, 0);		/* No shift */

	/*
	 * we have 3 sizes of pixels to move in X direction:
	 * 4 * 64   (unrolled TGA ops)
	 *     64   (single TGA op)
	 *      4   (CPU, using long word)
	 */

	if (xdir == 1) {   /* move to the left */

		if (wb & ~63)
		for (y = ystart; (ydir * y) <= (ydir * yend); y += yinc) {
			/* 4 * 64 byte chunks */
			for (xleft = wb, x = xstart; xleft >= 4 * 64;
			    x += 4 * 64, xleft -= 4 * 64) {

				/*
				 * XXX XXX Eight writes to different addresses
				 * XXX XXX should fill up the write buffers on
				 * XXX XXX 21064 and 21164 chips, but later
				 * XXX XXX CPUs might have larger write buffers
				 * XXX XXX which require further unrolling of
				 * XXX XXX this loop, or the insertion of
				 * XXX XXX memory barriers.
				 */
				TGAWALREG(dc, TGA_REG_GCSR, 0,
				    tga_srcb + y + x + 0 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 0,
				    tga_dstb + y + x + 0 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 1,
				    tga_srcb + y + x + 1 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 1,
				    tga_dstb + y + x + 1 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 2,
				    tga_srcb + y + x + 2 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 2,
				    tga_dstb + y + x + 2 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 3,
				    tga_srcb + y + x + 3 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 3,
				    tga_dstb + y + x + 3 * 64);
			}

			/* 64 byte chunks */
			for (; xleft >= 64; x += 64, xleft -= 64) {
				TGAWALREG(dc, TGA_REG_GCSR, 0,
				    tga_srcb + y + x + 0 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 0,
				    tga_dstb + y + x + 0 * 64);
			}
		}

		TGAWALREG(dc, TGA_REG_GOPR, 0, 0x0003); /* op -> dst = src */
		TGAWALREG(dc, TGA_REG_GMOR, 0, 0x0000); /* Simple mode */

		lastleft = wb & 63;
		if (lastleft) {
			lastx = xstart + (wb & ~63);
			for (y = ystart; (ydir * y) <= (ydir * yend);
			    y += yinc) {
				/* 4 byte granularity */
				for (x = lastx, xleft = lastleft; xleft >= 4;
				     x += 4, xleft -= 4) {
					*(uint32_t *)(dst->ri_bits + dstb +
					    y + x + 0 * 4) =
					    *(uint32_t *)(dst->ri_bits + srcb +
					    y + x + 0 * 4);
				}
			}
		}
	} else {    /* above move to the left, below move to the right */

		if (wb & ~63)
		for (y = ystart; (ydir * y) <= (ydir * yend); y += yinc) {
			/* 4 * 64 byte chunks */
			for (xleft = wb, x = xstart; xleft >= 4 * 64;
			    x -= 4 * 64, xleft -= 4 * 64) {

				/*
				 * XXX XXX Eight writes to different addresses
				 * XXX XXX should fill up the write buffers on
				 * XXX XXX 21064 and 21164 chips, but later
				 * XXX XXX CPUs might have larger write buffers
				 * XXX XXX which require further unrolling of
				 * XXX XXX this loop, or the insertion of
				 * XXX XXX memory barriers.
				 */
				TGAWALREG(dc, TGA_REG_GCSR, 0,
				    tga_srcb + y + x - 1 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 0,
				    tga_dstb + y + x - 1 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 1,
				    tga_srcb + y + x - 2 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 1,
				    tga_dstb + y + x - 2 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 2,
				    tga_srcb + y + x - 3 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 2,
				    tga_dstb + y + x - 3 * 64);
				TGAWALREG(dc, TGA_REG_GCSR, 3,
				    tga_srcb + y + x - 4 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 3,
				    tga_dstb + y + x - 4 * 64);
			}

			/* 64 byte chunks */
			for (; xleft >= 64; x -= 64, xleft -= 64) {
				TGAWALREG(dc, TGA_REG_GCSR, 0,
				    tga_srcb + y + x - 1 * 64);
				TGAWALREG(dc, TGA_REG_GCDR, 0,
				    tga_dstb + y + x - 1 * 64);
			}
		}

		TGAWALREG(dc, TGA_REG_GOPR, 0, 0x0003); /* op -> dst = src */
		TGAWALREG(dc, TGA_REG_GMOR, 0, 0x0000); /* Simple mode */

		lastleft = wb & 63;
		if (lastleft) {
			lastx = xstart - (wb & ~63);
			for (y = ystart; (ydir * y) <= (ydir * yend);
			    y += yinc) {
				/* 4 byte granularity */
				for (x = lastx, xleft = lastleft; xleft >= 4;
				    x -= 4, xleft -= 4) {
					*(uint32_t *)(dst->ri_bits + dstb +
					    y + x - 1 * 4) =
					    *(uint32_t *)(dst->ri_bits + srcb +
					    y + x - 1 * 4);
				}
			}
		}
	}
	return 0;
}


static void
tga_putchar(void *c, int row, int col, u_int uc, long attr)
{
	struct rasops_info *ri = c;
	struct tga_devconfig *dc = ri->ri_hw;
	int fs, height, width;
	uint8_t *fr;
	int32_t *rp;

	rp = (int32_t *)(ri->ri_bits +
	    row * ri->ri_yscale + col * ri->ri_xscale);

	height = ri->ri_font->fontheight;
	width = ri->ri_font->fontwidth;

	uc -= ri->ri_font->firstchar;
	fr = (uint8_t *)ri->ri_font->data + uc * ri->ri_fontscale;
	fs = ri->ri_font->stride;

	/* Set foreground and background color. XXX memoize this somehow?
	 * The rasops code has already expanded the color entry to 32 bits
	 * for us, even for 8-bit displays, so we don't have to do anything.
	 */
	TGAWREG(dc, TGA_REG_GFGR, ri->ri_devcmap[(attr >> 24) & 15]);
	TGAWREG(dc, TGA_REG_GBGR, ri->ri_devcmap[(attr >> 16) & 15]);

	/* Set raster operation to "copy"... */
	if (ri->ri_depth == 8)
		TGAWREG(dc, TGA_REG_GOPR, 0x3);
	else /* ... and in 24-bit mode, set the destination bitmap to 24-bit. */
		TGAWREG(dc, TGA_REG_GOPR, 0x3 | (0x3 << 8));

	/* Set which pixels we're drawing (of a possible 32). */
	TGAWREG(dc, TGA_REG_GPXR_P, (1 << width) - 1);

	/* Set drawing mode to opaque stipple. */
	TGAWREG(dc, TGA_REG_GMOR, 0x1);

	/* Insert write barrier before actually sending data */
	/* XXX Abuses the fact that there is only one write barrier on Alphas */
	TGAREGWB(dc, TGA_REG_GMOR, 1);

	while (height--) {
		/* The actual stipple write */
		*rp = fr[0] | (fr[1] << 8) | (fr[2] << 16) | (fr[3] << 24);

		fr += fs;
		rp = (int32_t *)((uint8_t *)rp + ri->ri_stride);
	}

	/* Do underline */
	if ((attr & 1) != 0) {
		rp = (int32_t *)((uint8_t *)rp - (ri->ri_stride << 1));
		*rp = 0xffffffff;
	}

	/* Set graphics mode back to normal. */
	TGAWREG(dc, TGA_REG_GMOR, 0);
	TGAWREG(dc, TGA_REG_GPXR_P, 0xffffffff);
}

static void
tga_eraserows(void *c, int row, int num, long attr)
{
	struct rasops_info *ri = c;
	struct tga_devconfig *dc = ri->ri_hw;
	int32_t color, lines, pixels;
	int32_t *rp;

	color = ri->ri_devcmap[(attr >> 16) & 15];
	rp = (int32_t *)(ri->ri_bits + row*ri->ri_yscale);
	lines = num * ri->ri_font->fontheight;
	pixels = ri->ri_emuwidth - 1;

	/* Set fill color in block-color registers */
	TGAWREG(dc, TGA_REG_GBCR0, color);
	TGAWREG(dc, TGA_REG_GBCR1, color);
	if (ri->ri_depth != 8) {
		TGAWREG(dc, TGA_REG_GBCR2, color);
		TGAWREG(dc, TGA_REG_GBCR3, color);
		TGAWREG(dc, TGA_REG_GBCR4, color);
		TGAWREG(dc, TGA_REG_GBCR5, color);
		TGAWREG(dc, TGA_REG_GBCR6, color);
		TGAWREG(dc, TGA_REG_GBCR7, color);
	}

	/* Set raster operation to "copy"... */
	if (ri->ri_depth == 8)
		TGAWREG(dc, TGA_REG_GOPR, 0x3);
	else /* ... and in 24-bit mode, set the destination bitmap to 24-bit. */
		TGAWREG(dc, TGA_REG_GOPR, 0x3 | (0x3 << 8));

	/* Set which pixels we're drawing (of a possible 32). */
	TGAWREG(dc, TGA_REG_GDAR, 0xffffffff);

	/* Set drawing mode to block fill. */
	TGAWREG(dc, TGA_REG_GMOR, 0x2d);

	/* Insert write barrier before actually sending data */
	/* XXX Abuses the fact that there is only one write barrier on Alphas */
	TGAREGWB(dc, TGA_REG_GMOR, 1);

	while (lines--) {
		*rp = pixels;
		rp = (int32_t *)((uint8_t *)rp + ri->ri_stride);
	}

	/* Set graphics mode back to normal. */
	TGAWREG(dc, TGA_REG_GMOR, 0);
}

static void
tga_erasecols (void *c, int row, int col, int num, long attr)
{
	struct rasops_info *ri = c;
	struct tga_devconfig *dc = ri->ri_hw;
	int32_t color, lines, pixels;
	int32_t *rp;

	color = ri->ri_devcmap[(attr >> 16) & 15];
	rp = (int32_t *)(ri->ri_bits + row*ri->ri_yscale + col*ri->ri_xscale);
	lines = ri->ri_font->fontheight;
	pixels = (num * ri->ri_font->fontwidth) - 1;

	/* Set fill color in block-color registers */
	TGAWREG(dc, TGA_REG_GBCR0, color);
	TGAWREG(dc, TGA_REG_GBCR1, color);
	if (ri->ri_depth != 8) {
		TGAWREG(dc, TGA_REG_GBCR2, color);
		TGAWREG(dc, TGA_REG_GBCR3, color);
		TGAWREG(dc, TGA_REG_GBCR4, color);
		TGAWREG(dc, TGA_REG_GBCR5, color);
		TGAWREG(dc, TGA_REG_GBCR6, color);
		TGAWREG(dc, TGA_REG_GBCR7, color);
	}

	/* Set raster operation to "copy"... */
	if (ri->ri_depth == 8)
		TGAWREG(dc, TGA_REG_GOPR, 0x3);
	else /* ... and in 24-bit mode, set the destination bitmap to 24-bit. */
		TGAWREG(dc, TGA_REG_GOPR, 0x3 | (0x3 << 8));

	/* Set which pixels we're drawing (of a possible 32). */
	TGAWREG(dc, TGA_REG_GDAR, 0xffffffff);

	/* Set drawing mode to block fill. */
	TGAWREG(dc, TGA_REG_GMOR, 0x2d);

	/* Insert write barrier before actually sending data */
	/* XXX Abuses the fact that there is only one write barrier on Alphas */
	TGAREGWB(dc, TGA_REG_GMOR, 1);

	while (lines--) {
		*rp = pixels;
		rp = (int32_t *)((uint8_t *)rp + ri->ri_stride);
	}

	/* Set graphics mode back to normal. */
	TGAWREG(dc, TGA_REG_GMOR, 0);
}


static void
tga_ramdac_wr(void *v, u_int btreg, uint8_t val)
{
	struct tga_devconfig *dc = v;

	if (btreg > BT485_REG_MAX)
		panic("tga_ramdac_wr: reg %d out of range", btreg);

	TGAWREG(dc, TGA_REG_EPDR, (btreg << 9) | (0 << 8 ) | val); /* XXX */
	TGAREGWB(dc, TGA_REG_EPDR, 1);
}

static void
tga2_ramdac_wr(void *v, u_int btreg, uint8_t val)
{
	struct tga_devconfig *dc = v;
	bus_space_handle_t ramdac;

	if (btreg > BT485_REG_MAX)
		panic("tga_ramdac_wr: reg %d out of range", btreg);

	bus_space_subregion(dc->dc_memt, dc->dc_memh,
	    TGA2_MEM_RAMDAC + (0xe << 12) + (btreg << 8), 4, &ramdac);
	bus_space_write_4(dc->dc_memt, ramdac, 0, val & 0xff);
	bus_space_barrier(dc->dc_memt, ramdac, 0, 4, BUS_SPACE_BARRIER_WRITE);
}

static uint8_t
tga_bt463_rd(void *v, u_int btreg)
{
	struct tga_devconfig *dc = v;
	tga_reg_t rdval;

	/*
	 * Strobe CE# (high->low->high) since status and data are latched on
	 * the falling and rising edges (respectively) of this active-low
	 * signal.
	 */

	TGAREGWB(dc, TGA_REG_EPSR, 1);
	TGAWREG(dc, TGA_REG_EPSR, (btreg << 2) | 2 | 1);
	TGAREGWB(dc, TGA_REG_EPSR, 1);
	TGAWREG(dc, TGA_REG_EPSR, (btreg << 2) | 2 | 0);

	TGAREGRB(dc, TGA_REG_EPSR, 1);

	rdval = TGARREG(dc, TGA_REG_EPDR);
	TGAREGWB(dc, TGA_REG_EPSR, 1);
	TGAWREG(dc, TGA_REG_EPSR, (btreg << 2) | 2 | 1);

	return (rdval >> 16) & 0xff;
}

static void
tga_bt463_wr(void *v, u_int btreg, uint8_t val)
{
	struct tga_devconfig *dc = v;

	/*
	 * In spite of the 21030 documentation, to set the MPU bus bits for
	 * a write, you set them in the upper bits of EPDR, not EPSR.
	 */

	/*
	 * Strobe CE# (high->low->high) since status and data are latched on
	 * the falling and rising edges of this active-low signal.
	 */

	TGAREGWB(dc, TGA_REG_EPDR, 1);
	TGAWREG(dc, TGA_REG_EPDR, (btreg << 10) | 0x100 | val);
	TGAREGWB(dc, TGA_REG_EPDR, 1);
	TGAWREG(dc, TGA_REG_EPDR, (btreg << 10) | 0x000 | val);
	TGAREGWB(dc, TGA_REG_EPDR, 1);
	TGAWREG(dc, TGA_REG_EPDR, (btreg << 10) | 0x100 | val);
}

static uint8_t
tga_ramdac_rd(void *v, u_int btreg)
{
	struct tga_devconfig *dc = v;
	tga_reg_t rdval;

	if (btreg > BT485_REG_MAX)
		panic("tga_ramdac_rd: reg %d out of range", btreg);

	TGAWREG(dc, TGA_REG_EPSR, (btreg << 1) | 0x1); /* XXX */
	TGAREGWB(dc, TGA_REG_EPSR, 1);

	rdval = TGARREG(dc, TGA_REG_EPDR);
	return (rdval >> 16) & 0xff;				/* XXX */
}

static uint8_t
tga2_ramdac_rd(void *v, u_int btreg)
{
	struct tga_devconfig *dc = v;
	bus_space_handle_t ramdac;
	uint8_t retval;

	if (btreg > BT485_REG_MAX)
		panic("tga_ramdac_rd: reg %d out of range", btreg);

	bus_space_subregion(dc->dc_memt, dc->dc_memh,
	    TGA2_MEM_RAMDAC + (0xe << 12) + (btreg << 8), 4, &ramdac);
	retval = bus_space_read_4(dc->dc_memt, ramdac, 0) & 0xff;
	bus_space_barrier(dc->dc_memt, ramdac, 0, 4, BUS_SPACE_BARRIER_READ);
	return retval;
}

#include <dev/ic/decmonitors.c>
static void tga2_ics9110_wr(struct tga_devconfig *dc, int dotclock);

static struct monitor *tga_getmonitor(struct tga_devconfig *dc);

static void
tga2_init(struct tga_devconfig *dc)
{
	struct	monitor *m = tga_getmonitor(dc);

	/* Deal with the dot clocks.
	 */
	if (dc->dc_tga_type == TGA_TYPE_POWERSTORM_4D20) {
		/*
		 * Set this up as a reference clock for the
		 * ibm561's PLL.
		 */
		tga2_ics9110_wr(dc, 14300000);
		/*
		 * XXX Can't set up the dotclock properly, until such time
		 * as the RAMDAC is configured.
		 */
	} else {
		/* otherwise the ics9110 is our clock. */
		tga2_ics9110_wr(dc, m->dotclock);
	}
#if 0
	TGAWREG(dc, TGA_REG_VHCR,
	    ((m->hbp / 4) << 21) |
	    ((m->hsync / 4) << 14) |
	    (((m->hfp - 4) / 4) << 9) |
	    ((m->cols + 4) / 4));
#else
	TGAWREG(dc, TGA_REG_VHCR,
	    ((m->hbp / 4) << 21) |
	    ((m->hsync / 4) << 14) |
	    (((m->hfp) / 4) << 9) |
	    ((m->cols) / 4));
#endif
	TGAWREG(dc, TGA_REG_VVCR,
	    (m->vbp << 22) |
	    (m->vsync << 16) |
	    (m->vfp << 11) |
	    (m->rows));
	TGAWREG(dc, TGA_REG_VVBR, 1);
	TGAREGRWB(dc, TGA_REG_VHCR, 3);
	TGAWREG(dc, TGA_REG_VVVR, TGARREG(dc, TGA_REG_VVVR) | 1);
	TGAREGRWB(dc, TGA_REG_VVVR, 1);
	TGAWREG(dc, TGA_REG_GPMR, 0xffffffff);
	TGAREGRWB(dc, TGA_REG_GPMR, 1);
}

void
tga2_ics9110_wr(struct tga_devconfig *dc, int dotclock)
{
	bus_space_handle_t clock;
	uint32_t valU;
	int N, M, R, V, X;
	int i;

	switch (dotclock) {
	case 130808000:
		N = 0x40; M = 0x7; V = 0x0; X = 0x1; R = 0x1; break;
	case 119840000:
		N = 0x2d; M = 0x2b; V = 0x1; X = 0x1; R = 0x1; break;
	case 108180000:
		N = 0x11; M = 0x9; V = 0x1; X = 0x1; R = 0x2; break;
	case 103994000:
		N = 0x6d; M = 0xf; V = 0x0; X = 0x1; R = 0x1; break;
	case 175000000:
		N = 0x5F; M = 0x3E; V = 0x1; X = 0x1; R = 0x1; break;
	case  75000000:
		N = 0x6e; M = 0x15; V = 0x0; X = 0x1; R = 0x1; break;
	case  74000000:
		N = 0x2a; M = 0x41; V = 0x1; X = 0x1; R = 0x1; break;
	case  69000000:
		N = 0x35; M = 0xb; V = 0x0; X = 0x1; R = 0x1; break;
	case  65000000:
		N = 0x6d; M = 0x0c; V = 0x0; X = 0x1; R = 0x2; break;
	case  50000000:
		N = 0x37; M = 0x3f; V = 0x1; X = 0x1; R = 0x2; break;
	case  40000000:
		N = 0x5f; M = 0x11; V = 0x0; X = 0x1; R = 0x2; break;
	case  31500000:
		N = 0x16; M = 0x05; V = 0x0; X = 0x1; R = 0x2; break;
	case  25175000:
		N = 0x66; M = 0x1d; V = 0x0; X = 0x1; R = 0x2; break;
	case 135000000:
		N = 0x42; M = 0x07; V = 0x0; X = 0x1; R = 0x1; break;
	case 110000000:
		N = 0x60; M = 0x32; V = 0x1; X = 0x1; R = 0x2; break;
	case 202500000:
		N = 0x60; M = 0x32; V = 0x1; X = 0x1; R = 0x2; break;
	case  14300000:		/* this one is just a ref clock */
		N = 0x03; M = 0x03; V = 0x1; X = 0x1; R = 0x3; break;
	default:
		panic("unrecognized clock rate %d", dotclock);
	}

	/* XXX -- hard coded, bad */
	valU =  N | ( M << 7 ) | (V << 14);
	valU |= (X << 15) | (R << 17);
	valU |= 0x17 << 19;

	bus_space_subregion(dc->dc_memt, dc->dc_memh, TGA2_MEM_EXTDEV +
	    TGA2_MEM_CLOCK + (0xe << 12), 4, &clock); /* XXX */

	for (i = 24; i > 0; i--) {
		uint32_t writeval;

		writeval = valU & 0x1;
		if (i == 1)
			writeval |= 0x2;
		valU >>= 1;
		bus_space_write_4(dc->dc_memt, clock, 0, writeval);
		bus_space_barrier(dc->dc_memt, clock, 0, 4,
		    BUS_SPACE_BARRIER_WRITE);
        }
	bus_space_subregion(dc->dc_memt, dc->dc_memh, TGA2_MEM_EXTDEV +
	    TGA2_MEM_CLOCK + (0xe << 12) + (0x1 << 11) + (0x1 << 11), 4,
	    &clock); /* XXX */
	bus_space_write_4(dc->dc_memt, clock, 0, 0x0);
	bus_space_barrier(dc->dc_memt, clock, 0, 0, BUS_SPACE_BARRIER_WRITE);
}

static struct monitor *
tga_getmonitor(struct tga_devconfig *dc)
{

	return &decmonitors[(~TGARREG(dc, TGA_REG_GREV) >> 16) & 0x0f];
}

static unsigned int
tga_getdotclock(struct tga_devconfig *dc)
{

	return tga_getmonitor(dc)->dotclock;
}