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sram.c revision 1.7 
      1 /*	$NetBSD: sram.c,v 1.7 2001/12/27 02:23:25 wiz 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	0x04
     50 #define SRAM_DEBUG_DONTDOIT	0x08
     51 int sramdebug = SRAM_DEBUG_IOCTL;
     52 #endif
     53 
     54 void sramattach __P((int));
     55 int sramopen __P((dev_t, int));
     56 void sramclose __P((dev_t, int));
     57 int sramioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
     58 
     59 /*
     60  *  functions for probeing.
     61  */
     62 /* ARGSUSED */
     63 void
     64 sramattach(num)
     65 	int num;
     66 {
     67 	sram_softc.flags = 0;
     68 	printf("sram0: 16k bytes accessible\n");
     69 }
     70 
     71 
     72 /*
     73  *  functions made available by conf.c
     74  */
     75 
     76 /*ARGSUSED*/
     77 int
     78 sramopen(dev, flags)
     79 	dev_t dev;
     80 	int flags;
     81 {
     82 	struct sram_softc *su = &sram_softc;
     83 
     84 #ifdef DEBUG
     85 	if (sramdebug & SRAM_DEBUG_OPEN)
     86 		printf ("Sram open\n");
     87 #endif
     88 
     89 	if (minor(dev) >= 1)
     90 		return EXDEV;
     91 
     92 	if (su->flags & SRF_OPEN) {
     93 		return (EBUSY);
     94 	}
     95 
     96 	su->flags |= SRF_OPEN;
     97 	if (flags & FREAD)
     98 		su->flags |= SRF_READ;
     99 	if (flags & FWRITE)
    100 		su->flags |= SRF_WRITE;
    101 
    102 	return (0);
    103 }
    104 
    105 /*ARGSUSED*/
    106 void
    107 sramclose (dev, flags)
    108 	dev_t dev;
    109 	int flags;
    110 {
    111 	struct sram_softc *su = &sram_softc;
    112 
    113 #ifdef DEBUG
    114 	if (sramdebug & SRAM_DEBUG_CLOSE)
    115 		printf ("Sram close\n");
    116 #endif
    117 
    118 	if (su->flags & SRF_OPEN) {
    119 		su->flags = 0;
    120 	}
    121 	su->flags &= ~(SRF_READ|SRF_WRITE);
    122 }
    123 
    124 
    125 extern
    126 
    127 /*ARGSUSED*/
    128 int
    129 sramioctl (dev, cmd, data, flag, p)
    130 	dev_t dev;
    131 	u_long cmd;
    132 	caddr_t data;
    133 	int flag;
    134 	struct proc *p;
    135 {
    136 	int error = 0;
    137 	struct sram_io *sram_io;
    138 	register char *sramtop = IODEVbase->io_sram;
    139 	struct sram_softc *su = &sram_softc;
    140 
    141 #ifdef DEBUG
    142 	if (sramdebug & SRAM_DEBUG_IOCTL)
    143 		printf("Sram ioctl cmd=%lx\n", cmd);
    144 #endif
    145 	sram_io = (struct sram_io *)data;
    146 
    147 	switch (cmd) {
    148 	case SIOGSRAM:
    149 		if ((su->flags & SRF_READ) == 0)
    150 			return(EPERM);
    151 #ifdef DEBUG
    152 		if (sramdebug & SRAM_DEBUG_IOCTL) {
    153     			printf("Sram ioctl SIOGSRAM address=%p\n", data);
    154     			printf("Sram ioctl SIOGSRAM 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 		memcpy(&(sram_io->sram), sramtop + sram_io->offset,
    161 		    SRAM_IO_SIZE);
    162 		break;
    163 	case SIOPSRAM:
    164 		if ((su->flags & SRF_WRITE) == 0)
    165 			return(EPERM);
    166 #ifdef DEBUG
    167 		if (sramdebug & SRAM_DEBUG_IOCTL) {
    168     			printf("Sram ioctl SIOPSRAM address=%p\n", data);
    169     			printf("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset);
    170 		}
    171 #endif
    172 		if (sram_io == NULL ||
    173 		    sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE)
    174 			return(EFAULT);
    175 #ifdef DEBUG
    176 		if (sramdebug & SRAM_DEBUG_DONTDOIT) {
    177 			printf ("Sram ioctl SIOPSRAM: skipping actual write\n");
    178 			break;
    179 		}
    180 #endif
    181 		sysport.sramwp = 0x31;
    182 		memcpy(sramtop + sram_io->offset, &(sram_io->sram),
    183 		    SRAM_IO_SIZE);
    184 		sysport.sramwp = 0x00;
    185 		break;
    186 	default:
    187 		error = EINVAL;
    188 		break;
    189 	}
    190 	return (error);
    191 }
    192