sram.c revision 1.17
1 /* $NetBSD: sram.c,v 1.17 2008/12/14 02:16:51 isaki 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: sram.c,v 1.17 2008/12/14 02:16:51 isaki Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/proc.h> 38 #include <sys/ioctl.h> 39 #include <sys/file.h> 40 #include <sys/malloc.h> 41 #include <sys/systm.h> 42 #include <sys/conf.h> 43 #include <sys/bus.h> 44 #include <sys/device.h> 45 46 #include <machine/sram.h> 47 #include <x68k/dev/intiovar.h> 48 #include <x68k/dev/sramvar.h> 49 #include <x68k/x68k/iodevice.h> 50 51 struct sram_softc sram_softc; 52 53 #ifdef DEBUG 54 #define SRAM_DEBUG_OPEN 0x01 55 #define SRAM_DEBUG_CLOSE 0x02 56 #define SRAM_DEBUG_IOCTL 0x04 57 #define SRAM_DEBUG_DONTDOIT 0x08 58 int sramdebug = SRAM_DEBUG_IOCTL; 59 #endif 60 61 void sramattach(int); 62 63 dev_type_open(sramopen); 64 dev_type_close(sramclose); 65 dev_type_ioctl(sramioctl); 66 67 const struct cdevsw sram_cdevsw = { 68 sramopen, sramclose, noread, nowrite, sramioctl, 69 nostop, notty, nopoll, nommap, nokqfilter, 70 }; 71 72 /* 73 * functions for probeing. 74 */ 75 /* ARGSUSED */ 76 void 77 sramattach(int num) 78 { 79 sram_softc.flags = 0; 80 printf("sram0: 16k bytes accessible\n"); 81 } 82 83 84 /* 85 * functions made available by conf.c 86 */ 87 88 /*ARGSUSED*/ 89 int 90 sramopen(dev_t dev, int flags, int mode, struct lwp *l) 91 { 92 struct sram_softc *su = &sram_softc; 93 94 #ifdef DEBUG 95 if (sramdebug & SRAM_DEBUG_OPEN) 96 printf ("Sram open\n"); 97 #endif 98 99 if (minor(dev) >= 1) 100 return EXDEV; 101 102 if (su->flags & SRF_OPEN) { 103 return (EBUSY); 104 } 105 106 su->flags |= SRF_OPEN; 107 if (flags & FREAD) 108 su->flags |= SRF_READ; 109 if (flags & FWRITE) 110 su->flags |= SRF_WRITE; 111 112 return (0); 113 } 114 115 /*ARGSUSED*/ 116 int 117 sramclose(dev_t dev, int flags, int mode, struct lwp *l) 118 { 119 struct sram_softc *su = &sram_softc; 120 121 #ifdef DEBUG 122 if (sramdebug & SRAM_DEBUG_CLOSE) 123 printf ("Sram close\n"); 124 #endif 125 126 if (su->flags & SRF_OPEN) { 127 su->flags = 0; 128 } 129 su->flags &= ~(SRF_READ|SRF_WRITE); 130 131 return (0); 132 } 133 134 /*ARGSUSED*/ 135 int 136 sramioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 137 { 138 int error = 0; 139 struct sram_io *sram_io; 140 char *sramtop = __UNVOLATILE(IODEVbase->io_sram); 141 struct sram_softc *su = &sram_softc; 142 143 #ifdef DEBUG 144 if (sramdebug & SRAM_DEBUG_IOCTL) 145 printf("Sram ioctl cmd=%lx\n", cmd); 146 #endif 147 sram_io = (struct sram_io *)data; 148 149 switch (cmd) { 150 case SIOGSRAM: 151 if ((su->flags & SRF_READ) == 0) 152 return(EPERM); 153 #ifdef DEBUG 154 if (sramdebug & SRAM_DEBUG_IOCTL) { 155 printf("Sram ioctl SIOGSRAM address=%p\n", data); 156 printf("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset); 157 } 158 #endif 159 if (sram_io == NULL || 160 sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 161 return(EFAULT); 162 memcpy(&(sram_io->sram), sramtop + sram_io->offset, 163 SRAM_IO_SIZE); 164 break; 165 case SIOPSRAM: 166 if ((su->flags & SRF_WRITE) == 0) 167 return(EPERM); 168 #ifdef DEBUG 169 if (sramdebug & SRAM_DEBUG_IOCTL) { 170 printf("Sram ioctl SIOPSRAM address=%p\n", data); 171 printf("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset); 172 } 173 #endif 174 if (sram_io == NULL || 175 sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 176 return(EFAULT); 177 #ifdef DEBUG 178 if (sramdebug & SRAM_DEBUG_DONTDOIT) { 179 printf("Sram ioctl SIOPSRAM: skipping actual write\n"); 180 break; 181 } 182 #endif 183 intio_set_sysport_sramwp(0x31); 184 memcpy(sramtop + sram_io->offset, &(sram_io->sram), 185 SRAM_IO_SIZE); 186 intio_set_sysport_sramwp(0x00); 187 break; 188 default: 189 error = EINVAL; 190 break; 191 } 192 return (error); 193 } 194
Indexes created Wed Oct 01 07:09:59 GMT 2025