vga_common.c

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    1 /* $NetBSD: vga_common.c,v 1.10 2008/04/08 12:07:27 cegger 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 1.10 2008/04/08 12:07:27 cegger Exp $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/device.h>
   35 #include <sys/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 #ifdef __i386__
   43 #include <arch/i386/bios/vesafbvar.h>
   44 #endif
   45 
   46 /*
   47  * The following functions implement back-end configuration grabbing
   48  * and attachment.
   49  */
   50 int
   51 vga_common_probe(bus_space_tag_t iot, bus_space_tag_t memt)
   52 {
   53         bus_space_handle_t ioh_vga, ioh_6845, memh;
   54         u_int8_t regval;
   55         u_int16_t vgadata;
   56         int gotio_vga, gotio_6845, gotmem, mono, rv;
   57         int dispoffset;
   58 #ifdef __i386__
   59         struct device *dv;
   60         struct vesafb_softc *vesafb;
   61 #endif
   62 
   63         gotio_vga = gotio_6845 = gotmem = rv = 0;
   64 
   65 #ifdef __i386__
   66         for (dv = alldevs.tqh_first; dv; dv=dv->dv_list.tqe_next)
   67                 if (strncmp(device_xname(dv), "vesafb", 6) == 0) {
   68                         vesafb = device_private(dv);
   69                         if (vesafb->sc_isconsole)
   70                                 goto bad;
   71                 }
   72 #endif
   73 
   74         if (bus_space_map(iot, 0x3c0, 0x10, 0, &ioh_vga))
   75                 goto bad;
   76         gotio_vga = 1;
   77 
   78         /* read "misc output register" */
   79         regval = bus_space_read_1(iot, ioh_vga, VGA_MISC_DATAR);
   80         mono = !(regval & 1);
   81 
   82         if (bus_space_map(iot, (mono ? 0x3b0 : 0x3d0), 0x10, 0, &ioh_6845))
   83                 goto bad;
   84         gotio_6845 = 1;
   85 
   86         if (bus_space_map(memt, 0xa0000, 0x20000, 0, &memh))
   87                 goto bad;
   88         gotmem = 1;
   89 
   90         dispoffset = (mono ? 0x10000 : 0x18000);
   91 
   92         vgadata = bus_space_read_2(memt, memh, dispoffset);
   93         bus_space_write_2(memt, memh, dispoffset, 0xa55a);
   94         if (bus_space_read_2(memt, memh, dispoffset) != 0xa55a)
   95                 goto bad;
   96         bus_space_write_2(memt, memh, dispoffset, vgadata);
   97 
   98         /*
   99          * check if this is really a VGA
  100          * (try to write "Color Select" register as XFree86 does)
  101          * XXX check before if at least EGA?
  102          */
  103         /* reset state */
  104         (void) bus_space_read_1(iot, ioh_6845, 10);
  105         bus_space_write_1(iot, ioh_vga, VGA_ATC_INDEX,
  106             20 | 0x20); /* colselect | enable */
  107         regval = bus_space_read_1(iot, ioh_vga, VGA_ATC_DATAR);
  108         /* toggle the implemented bits */
  109         bus_space_write_1(iot, ioh_vga, VGA_ATC_DATAW, regval ^ 0x0f);
  110         bus_space_write_1(iot, ioh_vga, VGA_ATC_INDEX, 20 | 0x20);
  111         /* read back */
  112         if (bus_space_read_1(iot, ioh_vga, VGA_ATC_DATAR) != (regval ^ 0x0f))
  113                 goto bad;
  114         /* restore contents */
  115         bus_space_write_1(iot, ioh_vga, VGA_ATC_DATAW, regval);
  116 
  117         rv = 1;
  118 bad:
  119         if (gotio_vga)
  120                 bus_space_unmap(iot, ioh_vga, 0x10);
  121         if (gotio_6845)
  122                 bus_space_unmap(iot, ioh_6845, 0x10);
  123         if (gotmem)
  124                 bus_space_unmap(memt, memh, 0x20000);
  125 
  126         return (rv);
  127 }

Cache object: 480241546940efd84200d43cc4b771e9

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

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