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Annotation of Net2/arch/hp300/dev/grf_tc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * from: Utah $Hdr: grf_tc.c 1.18 91/04/02$
        !            39:  *
        !            40:  *     @(#)grf_tc.c    7.4 (Berkeley) 5/7/91
        !            41:  */
        !            42: 
        !            43: #include "grf.h"
        !            44: #if NGRF > 0
        !            45: 
        !            46: /*
        !            47:  * Graphics routines for TOPCAT frame buffer
        !            48:  */
        !            49: #include "sys/param.h"
        !            50: #include "sys/errno.h"
        !            51: 
        !            52: #include "grfioctl.h"
        !            53: #include "grfvar.h"
        !            54: #include "grf_tcreg.h"
        !            55: 
        !            56: #include "../include/cpu.h"
        !            57: 
        !            58: /*
        !            59:  * Initialize hardware.
        !            60:  * Must fill in the grfinfo structure in g_softc.
        !            61:  * Returns 0 if hardware not present, non-zero ow.
        !            62:  */
        !            63: tc_init(gp, addr)
        !            64:        struct grf_softc *gp;
        !            65:        caddr_t addr;
        !            66: {
        !            67:        register struct tcboxfb *tp = (struct tcboxfb *) addr;
        !            68:        struct grfinfo *gi = &gp->g_display;
        !            69:        volatile u_char *fbp;
        !            70:        u_char save;
        !            71:        int fboff;
        !            72:        extern caddr_t sctopa(), iomap();
        !            73: 
        !            74:        if (ISIIOVA(addr))
        !            75:                gi->gd_regaddr = (caddr_t) IIOP(addr);
        !            76:        else
        !            77:                gi->gd_regaddr = sctopa(vatosc(addr));
        !            78:        gi->gd_regsize = 0x10000;
        !            79:        gi->gd_fbwidth = (tp->fbwmsb << 8) | tp->fbwlsb;
        !            80:        gi->gd_fbheight = (tp->fbhmsb << 8) | tp->fbhlsb;
        !            81:        gi->gd_fbsize = gi->gd_fbwidth * gi->gd_fbheight;
        !            82:        fboff = (tp->fbomsb << 8) | tp->fbolsb;
        !            83:        gi->gd_fbaddr = (caddr_t) (*((u_char *)addr + fboff) << 16);
        !            84:        if (gi->gd_regaddr >= (caddr_t)DIOIIBASE) {
        !            85:                /*
        !            86:                 * For DIO II space the fbaddr just computed is the offset
        !            87:                 * from the select code base (regaddr) of the framebuffer.
        !            88:                 * Hence it is also implicitly the size of the register set.
        !            89:                 */
        !            90:                gi->gd_regsize = (int) gi->gd_fbaddr;
        !            91:                gi->gd_fbaddr += (int) gi->gd_regaddr;
        !            92:                gp->g_regkva = addr;
        !            93:                gp->g_fbkva = addr + gi->gd_regsize;
        !            94:        } else {
        !            95:                /*
        !            96:                 * For DIO space we need to map the seperate framebuffer.
        !            97:                 */
        !            98:                gp->g_regkva = addr;
        !            99:                gp->g_fbkva = iomap(gi->gd_fbaddr, gi->gd_fbsize);
        !           100:        }
        !           101:        gi->gd_dwidth = (tp->dwmsb << 8) | tp->dwlsb;
        !           102:        gi->gd_dheight = (tp->dhmsb << 8) | tp->dhlsb;
        !           103:        gi->gd_planes = tp->num_planes;
        !           104:        gi->gd_colors = 1 << gi->gd_planes;
        !           105:        if (gi->gd_colors == 1) {
        !           106:                fbp = (u_char *) gp->g_fbkva;
        !           107:                tp->wen = ~0;
        !           108:                tp->prr = 0x3;
        !           109:                tp->fben = ~0;
        !           110:                save = *fbp;
        !           111:                *fbp = 0xFF;
        !           112:                gi->gd_colors = *fbp + 1;
        !           113:                *fbp = save;
        !           114:        }
        !           115:        return(1);
        !           116: }
        !           117: 
        !           118: /*
        !           119:  * Change the mode of the display.
        !           120:  * Right now all we can do is grfon/grfoff.
        !           121:  * Return a UNIX error number or 0 for success.
        !           122:  * Function may not be needed anymore.
        !           123:  */
        !           124: /*ARGSUSED*/
        !           125: tc_mode(gp, cmd)
        !           126:        struct grf_softc *gp;
        !           127: {
        !           128:        int error = 0;
        !           129: 
        !           130:        switch (cmd) {
        !           131:        case GM_GRFON:
        !           132:        case GM_GRFOFF:
        !           133:                break;
        !           134:        default:
        !           135:                error = EINVAL;
        !           136:                break;
        !           137:        }
        !           138:        return(error);
        !           139: }
        !           140: #endif

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