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Annotation of Gnu-Mach/chips/fb_hdw.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     File: fb_hdw.c
        !            28:  *     Author: Alessandro Forin, Carnegie Mellon University
        !            29:  *     Date:   7/91
        !            30:  *
        !            31:  *     Driver for the 3max Monochrome Frame Buffer Display,
        !            32:  *     hardware-level operations.
        !            33:  */
        !            34: 
        !            35: #include <mfb.h>
        !            36: #if    (NMFB > 0)
        !            37: #include <platforms.h>
        !            38: 
        !            39: #include <machine/machspl.h>
        !            40: #include <mach/std_types.h>
        !            41: #include <chips/busses.h>
        !            42: 
        !            43: #include <chips/screen_defs.h>
        !            44: 
        !            45: #include <chips/pm_defs.h>
        !            46: typedef pm_softc_t     fb_softc_t;
        !            47: 
        !            48: 
        !            49: #ifdef DECSTATION
        !            50: #include <mips/PMAX/pmag_aa.h>
        !            51: #include <mips/PMAX/tc.h>
        !            52: #endif
        !            53: 
        !            54: #ifdef FLAMINGO
        !            55: #include <mips/PMAX/pmag_aa.h>         /* XXX fixme */
        !            56: #include <alpha/DEC/tc.h>
        !            57: #endif
        !            58: 
        !            59: /*
        !            60:  * Definition of the driver for the auto-configuration program.
        !            61:  */
        !            62: 
        !            63: int    fb_probe(), fb_intr();
        !            64: static void    fb_attach();
        !            65: 
        !            66: vm_offset_t    fb_std[NMFB] = { 0 };
        !            67: struct bus_device *fb_info[NMFB];
        !            68: struct bus_driver fb_driver = 
        !            69:         { fb_probe, 0, fb_attach, 0, fb_std, "fb", fb_info,
        !            70:          0, 0, BUS_INTR_DISABLED};
        !            71: 
        !            72: /*
        !            73:  * Probe/Attach functions
        !            74:  */
        !            75: 
        !            76: fb_probe( /* reg, ui */)
        !            77: {
        !            78:        static probed_once = 0;
        !            79: 
        !            80:        /*
        !            81:         * Probing was really done sweeping the TC long ago
        !            82:         */
        !            83:        if (tc_probe("fb") == 0)
        !            84:                return 0;
        !            85:        if (probed_once++ > 1)
        !            86:                printf("[mappable] ");
        !            87:        return 1;
        !            88: }
        !            89: 
        !            90: static void
        !            91: fb_attach(ui)
        !            92:        struct bus_device *ui;
        !            93: {
        !            94:        /* ... */
        !            95:        printf(": monochrome display");
        !            96: }
        !            97: 
        !            98: 
        !            99: /*
        !           100:  * Interrupt routine
        !           101:  */
        !           102: 
        !           103: fb_intr(unit,spllevel)
        !           104:        spl_t   spllevel;
        !           105: {
        !           106:        register volatile char *ack;
        !           107: 
        !           108:        /* acknowledge interrupt */
        !           109:        ack = (volatile char *) fb_info[unit]->address + FB_OFFSET_IREQ;
        !           110:        *ack = 0;
        !           111: 
        !           112: #if    mips
        !           113:        splx(spllevel);
        !           114: #endif
        !           115:        lk201_led(unit);
        !           116: }
        !           117: 
        !           118: fb_vretrace(fb, on)
        !           119:        fb_softc_t      *fb;
        !           120: {
        !           121:        int i;
        !           122: 
        !           123:        for (i = 0; i < NMFB; i++)
        !           124:                if (fb_info[i]->address == (vm_offset_t)fb->framebuffer)
        !           125:                        break;
        !           126:        if (i == NMFB) return;
        !           127: 
        !           128:        (*tc_enable_interrupt)(fb_info[i]->adaptor, on, 0);
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Video on/off
        !           133:  */
        !           134: fb_video_on(fb, up)
        !           135:        fb_softc_t      *fb;
        !           136:        user_info_t     *up;
        !           137: {
        !           138:        if (!fb->cursor_state)  /* video is "on" at boot */
        !           139:                return;
        !           140:        bt455_video_on(fb->vdac_registers, up);
        !           141:        bt431_cursor_on(fb->cursor_registers);
        !           142:        fb->cursor_state = 0;
        !           143: }
        !           144: 
        !           145: fb_video_off(fb, up)
        !           146:        fb_softc_t      *fb;
        !           147:        user_info_t     *up;
        !           148: {
        !           149:        if (fb->cursor_state)
        !           150:                return;
        !           151:        bt455_video_off(fb->vdac_registers, up);
        !           152:        bt431_cursor_off(fb->cursor_registers);
        !           153:        fb->cursor_state = 1;
        !           154: }
        !           155: 
        !           156: /*
        !           157:  * Boot time initialization: must make device
        !           158:  * usable as console asap.
        !           159:  */
        !           160: extern int
        !           161:        fb_soft_reset(), fb_set_status(),
        !           162:        bt431_pos_cursor(), fb_video_on(),
        !           163:        fb_video_off(), fb_vretrace(),
        !           164:        pm_get_status(), pm_char_paint(),
        !           165:        pm_insert_line(), pm_remove_line(),
        !           166:        pm_clear_bitmap(), pm_map_page();
        !           167: 
        !           168: static struct screen_switch fb_sw = {
        !           169:        screen_noop,            /* graphic_open */
        !           170:        fb_soft_reset,          /* graphic_close */
        !           171:        fb_set_status,          /* set_status */
        !           172:        pm_get_status,          /* get_status */
        !           173:        pm_char_paint,          /* char_paint */
        !           174:        bt431_pos_cursor,       /* pos_cursor */
        !           175:        pm_insert_line,         /* insert_line */
        !           176:        pm_remove_line,         /* remove_line */
        !           177:        pm_clear_bitmap,        /* clear_bitmap */
        !           178:        fb_video_on,            /* video_on */
        !           179:        fb_video_off,   /* video_off */
        !           180:        fb_vretrace,            /* intr_enable */
        !           181:        pm_map_page             /* map_page */
        !           182: };
        !           183: 
        !           184: fb_cold_init(unit, up)
        !           185:        user_info_t     *up;
        !           186: {
        !           187:        fb_softc_t      *fb;
        !           188:        screen_softc_t  sc = screen(unit);
        !           189:        vm_offset_t     base = tc_probe("fb");
        !           190: 
        !           191:        bcopy(&fb_sw, &sc->sw, sizeof(sc->sw));
        !           192: #if 0
        !           193:        sc->flags |= MONO_SCREEN;
        !           194: #else
        !           195:        sc->flags |= COLOR_SCREEN;
        !           196: #endif
        !           197:        sc->frame_scanline_width = 2048;
        !           198:        sc->frame_height = 1024;
        !           199:        sc->frame_visible_width = 1280;
        !           200:        sc->frame_visible_height = 1024;
        !           201: 
        !           202:        pm_init_screen_params(sc, up);
        !           203:        (void) screen_up(unit, up);
        !           204: 
        !           205:        fb = pm_alloc(unit, base+FB_OFFSET_BT431, base+FB_OFFSET_VRAM, -1);
        !           206:        fb->vdac_registers = (char*) base + FB_OFFSET_BT455;
        !           207: 
        !           208:        screen_default_colors(up);
        !           209: 
        !           210:        fb_soft_reset(sc);
        !           211: 
        !           212:        /*
        !           213:         * Clearing the screen at boot saves from scrolling
        !           214:         * much, and speeds up booting quite a bit.
        !           215:         */
        !           216:        screen_blitc( unit, 'C'-'@');/* clear screen */
        !           217: }
        !           218: 
        !           219: #endif (NMFB > 0)

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