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sram.c revision 1.5 
      1 /*	$NetBSD: sram.c,v 1.5 1997/10/10 21:45:18 oki Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Kazuhisa Shimizu.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Kazuhisa Shimizu.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/param.h>
     34 #include <sys/proc.h>
     35 #include <sys/ioctl.h>
     36 #include <sys/file.h>
     37 #include <sys/malloc.h>
     38 #include <sys/systm.h>
     39 
     40 #include <machine/sram.h>
     41 #include <x68k/dev/sramvar.h>
     42 #include <x68k/x68k/iodevice.h>
     43 
     44 struct sram_softc sram_softc;
     45 
     46 #ifdef DEBUG
     47 #define SRAM_DEBUG_OPEN		0x01
     48 #define SRAM_DEBUG_CLOSE	0x02
     49 #define SRAM_DEBUG_IOCTL	0x03
     50 int sramdebug = SRAM_DEBUG_IOCTL;
     51 #endif
     52 
     53 void sramattach __P((int));
     54 int sramopen __P((dev_t, int));
     55 void sramclose __P((dev_t, int));
     56 int sramioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
     57 
     58 /*
     59  *  functions for probeing.
     60  */
     61 /* ARGSUSED */
     62 void
     63 sramattach(num)
     64 	int num;
     65 {
     66 	sram_softc.flags = 0;
     67 	printf("sram0: 16k bytes accessible\n");
     68 }
     69 
     70 
     71 /*
     72  *  functions made available by conf.c
     73  */
     74 
     75 /*ARGSUSED*/
     76 int
     77 sramopen(dev, flags)
     78 	dev_t dev;
     79 	int flags;
     80 {
     81 	struct sram_softc *su = &sram_softc;
     82 
     83 #ifdef DEBUG
     84 	if (sramdebug & SRAM_DEBUG_OPEN)
     85 		printf ("Sram open\n");
     86 #endif
     87 
     88 	if (minor(dev) >= 1)
     89 		return EXDEV;
     90 
     91 	if (su->flags & SRF_OPEN) {
     92 		return (EBUSY);
     93 	}
     94 
     95 	su->flags |= SRF_OPEN;
     96 	return (0);
     97 }
     98 
     99 /*ARGSUSED*/
    100 void
    101 sramclose (dev, flags)
    102 	dev_t dev;
    103 	int flags;
    104 {
    105 	struct sram_softc *su = &sram_softc;
    106 
    107 #ifdef DEBUG
    108 	if (sramdebug & SRAM_DEBUG_CLOSE)
    109 		printf ("Sram close\n");
    110 #endif
    111 
    112 	if (su->flags & SRF_OPEN) {
    113 		su->flags = 0;
    114 	}
    115 }
    116 
    117 
    118 /*ARGSUSED*/
    119 int
    120 sramioctl (dev, cmd, data, flag, p)
    121 	dev_t dev;
    122 	u_long cmd;
    123 	caddr_t data;
    124 	int flag;
    125 	struct proc *p;
    126 {
    127 	int error = 0;
    128 	struct sram_io *sram_io;
    129 	register char *sramtop = IODEVbase->io_sram;
    130 
    131 #ifdef DEBUG
    132 	if (sramdebug & SRAM_DEBUG_IOCTL)
    133 		printf("Sram ioctl cmd=%lx\n", cmd);
    134 #endif
    135 	sram_io = (struct sram_io *)data;
    136 
    137 	switch (cmd) {
    138 	case SIOGSRAM:
    139 #ifdef DEBUG
    140 		if (sramdebug & SRAM_DEBUG_IOCTL) {
    141     			printf("Sram ioctl SIOGSRAM address=%p\n", data);
    142     			printf("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset);
    143 		}
    144 #endif
    145 		if (sram_io == NULL ||
    146 		    sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
    147 			return(EFAULT);
    148 		bcopy(sramtop + sram_io->offset, &(sram_io->sram), SRAM_IO_SIZE);
    149 		break;
    150 	case SIOPSRAM:
    151 #ifdef DEBUG
    152 		if (sramdebug & SRAM_DEBUG_IOCTL) {
    153     			printf("Sram ioctl SIOSSRAM address=%p\n", data);
    154     			printf("Sram ioctl SIOSSRAM offset=%x\n", sram_io->offset);
    155 		}
    156 #endif
    157 		if (sram_io == NULL ||
    158 		    sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
    159 			return(EFAULT);
    160 		sysport.sramwp = 0x31;
    161 		bcopy(&(sram_io->sram), sramtop + sram_io->offset,SRAM_IO_SIZE);
    162 		sysport.sramwp = 0x00;
    163 		break;
    164 	default:
    165 		error = EINVAL;
    166 		break;
    167 	}
    168 	return (error);
    169 }
    170