Add a simple unaccelerated vt(4) framebuffer driver for Sun framebuffers

handled by creator(4) (Sun Creator 3D, Elite 3D, etc.). This provides
vt(4) consoles on all devices currently supported by syscons on sparc64.
The driver should also be easily adaptable to support newer Sun framebuffers
such as the XVR-500 and higher.

Many thanks to dumbbell@ (Jean-Sebastien Pedron) for testing this remotely
during development.

sys/conf/files.sparc64

@@ -35,6 +35,7 @@ dev/atkbdc/psm.c		optional	psm atkbdc
 dev/auxio/auxio.c		optional	auxio sbus | auxio ebus
 dev/esp/esp_sbus.c		optional	esp sbus
 dev/fb/creator.c		optional	creator sc
+dev/fb/creator_vt.c		optional	creator vt
 dev/fb/fb.c			optional	sc
 dev/fb/gallant12x22.c		optional	sc
 dev/fb/machfb.c			optional	machfb sc

sys/dev/fb/creator_vt.c

@@ -0,0 +1,220 @@
+/*-
+ * Copyright (c) 2014 Nathan Whitehorn
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/fbio.h>
+
+#include <dev/vt/vt.h>
+#include <dev/vt/hw/fb/vt_fb.h>
+#include <dev/vt/colors/vt_termcolors.h>
+
+#include <machine/bus.h>
+#include <machine/bus_private.h>
+
+#include <dev/ofw/openfirm.h>
+#include "creatorreg.h"
+
+static vd_probe_t	creatorfb_probe;
+static vd_init_t	creatorfb_init;
+static vd_blank_t	creatorfb_blank;
+static vd_bitbltchr_t	creatorfb_bitbltchr;
+
+static const struct vt_driver vt_creatorfb_driver = {
+	.vd_name	= "creatorfb",
+	.vd_probe	= creatorfb_probe,
+	.vd_init	= creatorfb_init,
+	.vd_blank	= creatorfb_blank,
+	.vd_bitbltchr	= creatorfb_bitbltchr,
+	.vd_maskbitbltchr = creatorfb_bitbltchr,
+	.vd_fb_ioctl	= vt_fb_ioctl,
+	.vd_fb_mmap	= vt_fb_mmap,
+	.vd_priority	= VD_PRIORITY_SPECIFIC
+};
+
+struct creatorfb_softc {
+	struct fb_info fb;
+	struct bus_space_tag memt[1];
+	bus_space_handle_t memh;
+};
+
+static struct creatorfb_softc creatorfb_conssoftc;
+VT_DRIVER_DECLARE(vt_creatorfb, vt_creatorfb_driver);
+
+static int
+creatorfb_probe(struct vt_device *vd)
+{
+	phandle_t chosen, node;
+	ihandle_t stdout;
+	char type[64], name[64];
+
+	chosen = OF_finddevice("/chosen");
+	OF_getprop(chosen, "stdout", &stdout, sizeof(stdout));
+	node = OF_instance_to_package(stdout);
+	if (node == -1) {
+		/*
+		 * The "/chosen/stdout" does not exist try
+		 * using "screen" directly.
+		 */
+		node = OF_finddevice("screen");
+	}
+	OF_getprop(node, "device_type", type, sizeof(type));
+	if (strcmp(type, "display") != 0)
+		return (CN_DEAD);
+
+	OF_getprop(node, "name", name, sizeof(name));
+	if (strcmp(name, "SUNW,ffb") != 0 && strcmp(name, "SUNW,afb") != 0)
+		return (CN_DEAD);
+
+	/* Looks OK... */
+	return (CN_INTERNAL);
+}
+
+static int
+creatorfb_init(struct vt_device *vd)
+{
+	struct creatorfb_softc *sc;
+	phandle_t chosen;
+	phandle_t node;
+	ihandle_t handle;
+	uint32_t height, width;
+	char type[64], name[64];
+	bus_addr_t phys;
+	int space;
+
+	/* Initialize softc */
+	vd->vd_softc = sc = &creatorfb_conssoftc;
+
+	chosen = OF_finddevice("/chosen");
+	OF_getprop(chosen, "stdout", &handle, sizeof(ihandle_t));
+	node = OF_instance_to_package(handle);
+	if (node == -1) {
+		/*
+		 * The "/chosen/stdout" does not exist try
+		 * using "screen" directly.
+		 */
+		node = OF_finddevice("screen");
+		handle = OF_open("screen");
+	}
+	OF_getprop(node, "device_type", type, sizeof(type));
+	if (strcmp(type, "display") != 0)
+		return (CN_DEAD);
+
+	OF_getprop(node, "name", name, sizeof(name));
+	if (strcmp(name, "SUNW,ffb") != 0 && strcmp(name, "SUNW,afb") != 0)
+		return (CN_DEAD);
+
+	/* Make sure we have needed properties */
+	if (OF_getproplen(node, "height") != sizeof(height) ||
+	    OF_getproplen(node, "width") != sizeof(width))
+		return (CN_DEAD);
+
+	OF_getprop(node, "height", &height, sizeof(height));
+	OF_getprop(node, "width", &width, sizeof(width));
+
+	sc->fb.fb_height = height;
+	sc->fb.fb_width = width;
+	sc->fb.fb_bpp = sc->fb.fb_depth = 32;
+	sc->fb.fb_stride = 8192; /* Fixed */
+	sc->fb.fb_size = sc->fb.fb_height * sc->fb.fb_stride;
+
+	/* Map linear framebuffer */
+	if (OF_decode_addr(node, FFB_DFB24, &space, &phys) != 0)
+		return (CN_DEAD);
+	sc->fb.fb_pbase = phys;
+	sc->memh = sparc64_fake_bustag(space, phys, &sc->memt[0]);
+
+	/* 32-bit VGA palette */
+	vt_generate_vga_palette(sc->fb.fb_cmap, COLOR_FORMAT_RGB,
+	    255, 16, 255, 8, 255, 0);
+
+	vt_fb_init(vd);
+
+	return (CN_INTERNAL);
+}
+
+static void
+creatorfb_blank(struct vt_device *vd, term_color_t color)
+{
+	struct creatorfb_softc *sc;
+	uint32_t c;
+	int i;
+
+	sc = vd->vd_softc;
+	c = sc->fb.fb_cmap[color];
+
+	for (i = 0; i < sc->fb.fb_height; i++)
+		bus_space_set_region_4(sc->memt, sc->memh, i*sc->fb.fb_stride,
+		    c, sc->fb.fb_width);
+}
+
+static void
+creatorfb_bitbltchr(struct vt_device *vd, const uint8_t *src,
+    const uint8_t *mask, int bpl, vt_axis_t top, vt_axis_t left,
+    unsigned int width, unsigned int height, term_color_t fg, term_color_t bg)
+{
+	struct creatorfb_softc *sc = vd->vd_softc;
+	u_long line;
+	uint32_t fgc, bgc;
+	int c;
+	uint8_t b, m;
+
+	fgc = sc->fb.fb_cmap[fg];
+	bgc = sc->fb.fb_cmap[bg];
+	b = m = 0;
+
+	/* Don't try to put off screen pixels */
+	if (((left + width) > vd->vd_width) || ((top + height) >
+	    vd->vd_height))
+		return;
+
+	line = (sc->fb.fb_stride * top) + 4*left;
+	for (; height > 0; height--) {
+		for (c = 0; c < width; c++) {
+			if (c % 8 == 0)
+				b = *src++;
+			else
+				b <<= 1;
+			if (mask != NULL) {
+				if (c % 8 == 0)
+					m = *mask++;
+				else
+					m <<= 1;
+				/* Skip pixel write if mask not set. */
+				if ((m & 0x80) == 0)
+					continue;
+			}
+			bus_space_write_4(sc->memt, sc->memh, line + 4*c,
+			    (b & 0x80) ? fgc : bgc);
+		}
+		line += sc->fb.fb_stride;
+	}
+}
+