sram.c revision 1.22
1 /* $NetBSD: sram.c,v 1.22 2024/01/07 07:58:33 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 1.22 2024/01/07 07:58:33 isaki Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/ioctl.h> 40 #include <sys/file.h> 41 #include <sys/conf.h> 42 #include <sys/bus.h> 43 #include <sys/device.h> 44 45 #include <machine/sram.h> 46 #include <x68k/dev/intiovar.h> 47 #include <x68k/dev/sramvar.h> 48 49 #include "ioconf.h" 50 51 #define SRAM_ADDR (0xed0000) 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 #define DPRINTF(flag, msg) do { \ 60 if ((sramdebug & (flag))) \ 61 printf msg; \ 62 } while (0) 63 #else 64 #define DPRINTF(flag, msg) /* nothing */ 65 #endif 66 67 int srammatch(device_t, cfdata_t, void *); 68 void sramattach(device_t, device_t, void *); 69 70 dev_type_open(sramopen); 71 dev_type_close(sramclose); 72 dev_type_ioctl(sramioctl); 73 74 CFATTACH_DECL_NEW(sram, sizeof(struct sram_softc), 75 srammatch, sramattach, NULL, NULL); 76 77 const struct cdevsw sram_cdevsw = { 78 .d_open = sramopen, 79 .d_close = sramclose, 80 .d_read = noread, 81 .d_write = nowrite, 82 .d_ioctl = sramioctl, 83 .d_stop = nostop, 84 .d_tty = notty, 85 .d_poll = nopoll, 86 .d_mmap = nommap, 87 .d_kqfilter = nokqfilter, 88 .d_discard = nodiscard, 89 .d_flag = 0 90 }; 91 92 static int sram_attached; 93 94 /* 95 * functions for probeing. 96 */ 97 int 98 srammatch(device_t parent, cfdata_t cf, void *aux) 99 { 100 struct intio_attach_args *ia = aux; 101 102 if (sram_attached) 103 return 0; 104 105 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 106 ia->ia_addr = SRAM_ADDR; 107 108 /* Fixed parameter */ 109 if (ia->ia_addr != SRAM_ADDR) 110 return 0; 111 112 return 1; 113 } 114 115 void 116 sramattach(device_t parent, device_t self, void *aux) 117 { 118 struct sram_softc *sc = device_private(self); 119 struct intio_attach_args *ia = aux; 120 bus_space_tag_t iot; 121 bus_space_handle_t ioh; 122 123 /* Map I/O space */ 124 iot = ia->ia_bst; 125 if (bus_space_map(iot, ia->ia_addr, SRAM_SIZE, 0, &ioh)) 126 goto out; 127 128 /* Initialize sc */ 129 sc->sc_iot = iot; 130 sc->sc_ioh = ioh; 131 132 sc->sc_flags = 0; 133 aprint_normal(": 16k bytes accessible\n"); 134 sram_attached = 1; 135 return; 136 137 out: 138 aprint_normal(": not accessible\n"); 139 } 140 141 142 /*ARGSUSED*/ 143 int 144 sramopen(dev_t dev, int flags, int mode, struct lwp *l) 145 { 146 struct sram_softc *sc; 147 148 DPRINTF(SRAM_DEBUG_OPEN, ("Sram open\n")); 149 150 sc = device_lookup_private(&sram_cd, minor(dev)); 151 if (sc == NULL) 152 return ENXIO; 153 154 if (sc->sc_flags & SRF_OPEN) 155 return EBUSY; 156 157 sc->sc_flags |= SRF_OPEN; 158 if (flags & FREAD) 159 sc->sc_flags |= SRF_READ; 160 if (flags & FWRITE) 161 sc->sc_flags |= SRF_WRITE; 162 163 return 0; 164 } 165 166 /*ARGSUSED*/ 167 int 168 sramclose(dev_t dev, int flags, int mode, struct lwp *l) 169 { 170 struct sram_softc *sc; 171 172 DPRINTF(SRAM_DEBUG_CLOSE, ("Sram close\n")); 173 174 sc = device_lookup_private(&sram_cd, minor(dev)); 175 if (sc == NULL) 176 return ENXIO; 177 178 if (sc->sc_flags & SRF_OPEN) { 179 sc->sc_flags = 0; 180 } 181 sc->sc_flags &= ~(SRF_READ|SRF_WRITE); 182 183 return 0; 184 } 185 186 /*ARGSUSED*/ 187 int 188 sramioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 189 { 190 int error = 0; 191 struct sram_io *sram_io; 192 struct sram_softc *sc; 193 194 DPRINTF(SRAM_DEBUG_IOCTL, ("Sram ioctl cmd=%lx\n", cmd)); 195 196 sc = device_lookup_private(&sram_cd, minor(dev)); 197 if (sc == NULL) 198 return ENXIO; 199 200 sram_io = (struct sram_io *)data; 201 if (sram_io == NULL) 202 return EFAULT; 203 204 switch (cmd) { 205 case SIOGSRAM: 206 if ((sc->sc_flags & SRF_READ) == 0) 207 return EPERM; 208 DPRINTF(SRAM_DEBUG_IOCTL, 209 ("Sram ioctl SIOGSRAM address=%p\n", data)); 210 DPRINTF(SRAM_DEBUG_IOCTL, 211 ("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset)); 212 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 213 return EFAULT; 214 bus_space_read_region_1(sc->sc_iot, sc->sc_ioh, sram_io->offset, 215 (uint8_t *)&sram_io->sram, SRAM_IO_SIZE); 216 break; 217 case SIOPSRAM: 218 if ((sc->sc_flags & SRF_WRITE) == 0) 219 return EPERM; 220 DPRINTF(SRAM_DEBUG_IOCTL, 221 ("Sram ioctl SIOPSRAM address=%p\n", data)); 222 DPRINTF(SRAM_DEBUG_IOCTL, 223 ("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset)); 224 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 225 return EFAULT; 226 #ifdef DEBUG 227 if (sramdebug & SRAM_DEBUG_DONTDOIT) { 228 printf("Sram ioctl SIOPSRAM: skipping actual write\n"); 229 break; 230 } 231 #endif 232 intio_set_sysport_sramwp(0x31); 233 bus_space_write_region_1(sc->sc_iot, sc->sc_ioh, 234 sram_io->offset, (uint8_t *)&sram_io->sram, 235 SRAM_IO_SIZE); 236 intio_set_sysport_sramwp(0x00); 237 break; 238 default: 239 error = EINVAL; 240 break; 241 } 242 return error; 243 } 244
Indexes created Wed Oct 01 19:09:53 GMT 2025