Initial source

1 files changed, 219 insertions, 0 deletions

diff --git a/chips/fb_hdw.c b/chips/fb_hdw.c
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * 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 Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: fb_hdw.c
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	7/91
+ *
+ *	Driver for the 3max Monochrome Frame Buffer Display,
+ *	hardware-level operations.
+ */
+
+#include <mfb.h>
+#if	(NMFB > 0)
+#include <platforms.h>
+
+#include <machine/machspl.h>
+#include <mach/std_types.h>
+#include <chips/busses.h>
+
+#include <chips/screen_defs.h>
+
+#include <chips/pm_defs.h>
+typedef pm_softc_t	fb_softc_t;
+
+
+#ifdef	DECSTATION
+#include <mips/PMAX/pmag_aa.h>
+#include <mips/PMAX/tc.h>
+#endif
+
+#ifdef	FLAMINGO
+#include <mips/PMAX/pmag_aa.h>		/* XXX fixme */
+#include <alpha/DEC/tc.h>
+#endif
+
+/*
+ * Definition of the driver for the auto-configuration program.
+ */
+
+int	fb_probe(), fb_intr();
+static void	fb_attach();
+
+vm_offset_t	fb_std[NMFB] = { 0 };
+struct	bus_device *fb_info[NMFB];
+struct	bus_driver fb_driver = 
+        { fb_probe, 0, fb_attach, 0, fb_std, "fb", fb_info,
+	  0, 0, BUS_INTR_DISABLED};
+
+/*
+ * Probe/Attach functions
+ */
+
+fb_probe( /* reg, ui */)
+{
+	static probed_once = 0;
+
+	/*
+	 * Probing was really done sweeping the TC long ago
+	 */
+	if (tc_probe("fb") == 0)
+		return 0;
+	if (probed_once++ > 1)
+		printf("[mappable] ");
+	return 1;
+}
+
+static void
+fb_attach(ui)
+	struct bus_device *ui;
+{
+	/* ... */
+	printf(": monochrome display");
+}
+
+
+/*
+ * Interrupt routine
+ */
+
+fb_intr(unit,spllevel)
+	spl_t	spllevel;
+{
+	register volatile char *ack;
+
+	/* acknowledge interrupt */
+	ack = (volatile char *) fb_info[unit]->address + FB_OFFSET_IREQ;
+	*ack = 0;
+
+#if	mips
+	splx(spllevel);
+#endif
+	lk201_led(unit);
+}
+
+fb_vretrace(fb, on)
+	fb_softc_t	*fb;
+{
+	int i;
+
+	for (i = 0; i < NMFB; i++)
+		if (fb_info[i]->address == (vm_offset_t)fb->framebuffer)
+			break;
+	if (i == NMFB) return;
+
+	(*tc_enable_interrupt)(fb_info[i]->adaptor, on, 0);
+}
+
+/*
+ * Video on/off
+ */
+fb_video_on(fb, up)
+	fb_softc_t	*fb;
+	user_info_t	*up;
+{
+	if (!fb->cursor_state)	/* video is "on" at boot */
+		return;
+	bt455_video_on(fb->vdac_registers, up);
+	bt431_cursor_on(fb->cursor_registers);
+	fb->cursor_state = 0;
+}
+
+fb_video_off(fb, up)
+	fb_softc_t	*fb;
+	user_info_t	*up;
+{
+	if (fb->cursor_state)
+		return;
+	bt455_video_off(fb->vdac_registers, up);
+	bt431_cursor_off(fb->cursor_registers);
+	fb->cursor_state = 1;
+}
+
+/*
+ * Boot time initialization: must make device
+ * usable as console asap.
+ */
+extern int
+	fb_soft_reset(), fb_set_status(),
+	bt431_pos_cursor(), fb_video_on(),
+	fb_video_off(), fb_vretrace(),
+	pm_get_status(), pm_char_paint(),
+	pm_insert_line(), pm_remove_line(),
+	pm_clear_bitmap(), pm_map_page();
+
+static struct screen_switch fb_sw = {
+	screen_noop,		/* graphic_open */
+	fb_soft_reset,		/* graphic_close */
+	fb_set_status,		/* set_status */
+	pm_get_status,		/* get_status */
+	pm_char_paint,		/* char_paint */
+	bt431_pos_cursor,	/* pos_cursor */
+	pm_insert_line,		/* insert_line */
+	pm_remove_line,		/* remove_line */
+	pm_clear_bitmap,	/* clear_bitmap */
+	fb_video_on,		/* video_on */
+	fb_video_off,	/* video_off */
+	fb_vretrace,		/* intr_enable */
+	pm_map_page		/* map_page */
+};
+
+fb_cold_init(unit, up)
+	user_info_t	*up;
+{
+	fb_softc_t	*fb;
+	screen_softc_t	sc = screen(unit);
+	vm_offset_t	base = tc_probe("fb");
+
+	bcopy(&fb_sw, &sc->sw, sizeof(sc->sw));
+#if 0
+	sc->flags |= MONO_SCREEN;
+#else
+	sc->flags |= COLOR_SCREEN;
+#endif
+	sc->frame_scanline_width = 2048;
+	sc->frame_height = 1024;
+	sc->frame_visible_width = 1280;
+	sc->frame_visible_height = 1024;
+
+	pm_init_screen_params(sc, up);
+	(void) screen_up(unit, up);
+
+	fb = pm_alloc(unit, base+FB_OFFSET_BT431, base+FB_OFFSET_VRAM, -1);
+	fb->vdac_registers = (char*) base + FB_OFFSET_BT455;
+
+	screen_default_colors(up);
+
+	fb_soft_reset(sc);
+
+	/*
+	 * Clearing the screen at boot saves from scrolling
+	 * much, and speeds up booting quite a bit.
+	 */
+	screen_blitc( unit, 'C'-'@');/* clear screen */
+}
+
+#endif	(NMFB > 0)