The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/vga_common.c

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    1 /* $NetBSD: vga_common.c,v 1.4 2003/07/14 15:47:12 lukem Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
    5  * All rights reserved.
    6  *
    7  * Author: Chris G. Demetriou
    8  * 
    9  * Permission to use, copy, modify and distribute this software and
   10  * its documentation is hereby granted, provided that both the copyright
   11  * notice and this permission notice appear in all copies of the
   12  * software, derivative works or modified versions, and any portions
   13  * thereof, and that both notices appear in supporting documentation.
   14  * 
   15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
   16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
   17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   18  * 
   19  * Carnegie Mellon requests users of this software to return to
   20  *
   21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   22  *  School of Computer Science
   23  *  Carnegie Mellon University
   24  *  Pittsburgh PA 15213-3890
   25  *
   26  * any improvements or extensions that they make and grant Carnegie the
   27  * rights to redistribute these changes.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __KERNEL_RCSID(0, "$NetBSD: vga_common.c,v 1.4 2003/07/14 15:47:12 lukem Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/device.h>
   35 #include <machine/bus.h>
   36 
   37 #include <dev/ic/mc6845reg.h>
   38 #include <dev/ic/pcdisplayvar.h>
   39 #include <dev/ic/vgareg.h>
   40 #include <dev/ic/vgavar.h>
   41 
   42 /*
   43  * The following functions implement back-end configuration grabbing
   44  * and attachment.
   45  */
   46 int
   47 vga_common_probe(bus_space_tag_t iot, bus_space_tag_t memt)
   48 {
   49         bus_space_handle_t ioh_vga, ioh_6845, memh;
   50         u_int8_t regval;
   51         u_int16_t vgadata;
   52         int gotio_vga, gotio_6845, gotmem, mono, rv;
   53         int dispoffset;
   54 
   55         gotio_vga = gotio_6845 = gotmem = rv = 0;
   56 
   57         if (bus_space_map(iot, 0x3c0, 0x10, 0, &ioh_vga))
   58                 goto bad;
   59         gotio_vga = 1;
   60 
   61         /* read "misc output register" */
   62         regval = bus_space_read_1(iot, ioh_vga, VGA_MISC_DATAR);
   63         mono = !(regval & 1);
   64 
   65         if (bus_space_map(iot, (mono ? 0x3b0 : 0x3d0), 0x10, 0, &ioh_6845))
   66                 goto bad;
   67         gotio_6845 = 1;
   68 
   69         if (bus_space_map(memt, 0xa0000, 0x20000, 0, &memh))
   70                 goto bad;
   71         gotmem = 1;
   72 
   73         dispoffset = (mono ? 0x10000 : 0x18000);
   74 
   75         vgadata = bus_space_read_2(memt, memh, dispoffset);
   76         bus_space_write_2(memt, memh, dispoffset, 0xa55a);
   77         if (bus_space_read_2(memt, memh, dispoffset) != 0xa55a)
   78                 goto bad;
   79         bus_space_write_2(memt, memh, dispoffset, vgadata);
   80 
   81         /*
   82          * check if this is really a VGA
   83          * (try to write "Color Select" register as XFree86 does)
   84          * XXX check before if at least EGA?
   85          */
   86         /* reset state */
   87         (void) bus_space_read_1(iot, ioh_6845, 10);
   88         bus_space_write_1(iot, ioh_vga, VGA_ATC_INDEX,
   89             20 | 0x20); /* colselect | enable */
   90         regval = bus_space_read_1(iot, ioh_vga, VGA_ATC_DATAR);
   91         /* toggle the implemented bits */
   92         bus_space_write_1(iot, ioh_vga, VGA_ATC_DATAW, regval ^ 0x0f);
   93         bus_space_write_1(iot, ioh_vga, VGA_ATC_INDEX, 20 | 0x20);
   94         /* read back */
   95         if (bus_space_read_1(iot, ioh_vga, VGA_ATC_DATAR) != (regval ^ 0x0f))
   96                 goto bad;
   97         /* restore contents */
   98         bus_space_write_1(iot, ioh_vga, VGA_ATC_DATAW, regval);
   99 
  100         rv = 1;
  101 bad:
  102         if (gotio_vga)
  103                 bus_space_unmap(iot, ioh_vga, 0x10);
  104         if (gotio_6845)
  105                 bus_space_unmap(iot, ioh_6845, 0x10);
  106         if (gotmem)
  107                 bus_space_unmap(memt, memh, 0x20000);
  108 
  109         return (rv);
  110 }

Cache object: cab762b5a48b4dc302be71879e78c591


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