diff options
Diffstat (limited to 'chips/fb_hdw.c')
| -rw-r--r-- | chips/fb_hdw.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/chips/fb_hdw.c b/chips/fb_hdw.c new file mode 100644 index 0000000..7139a86 --- /dev/null +++ b/chips/fb_hdw.c @@ -0,0 +1,219 @@ +/* + * 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) |