1 /* $NetBSD: sram.c,v 1.18 2008/12/21 09:01:19 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 1.18 2008/12/21 09:01:19 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 #define SRAM_ADDR (0xed0000) 50 51 #ifdef DEBUG 52 #define SRAM_DEBUG_OPEN 0x01 53 #define SRAM_DEBUG_CLOSE 0x02 54 #define SRAM_DEBUG_IOCTL 0x04 55 #define SRAM_DEBUG_DONTDOIT 0x08 56 int sramdebug = SRAM_DEBUG_IOCTL; 57 #define DPRINTF(flag, msg) do { \ 58 if ((sramdebug & (flag))) \ 59 printf msg; \ 60 } while (0) 61 #else 62 #define DPRINTF(flag, msg) /* nothing */ 63 #endif 64 65 int srammatch(device_t, cfdata_t, void *); 66 void sramattach(device_t, device_t, void *); 67 68 extern struct cfdriver sram_cd; 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 sramopen, sramclose, noread, nowrite, sramioctl, 79 nostop, notty, nopoll, nommap, nokqfilter, 80 }; 81 82 static int sram_attached; 83 84 /* 85 * functions for probeing. 86 */ 87 int 88 srammatch(device_t parent, cfdata_t cf, void *aux) 89 { 90 struct intio_attach_args *ia = aux; 91 92 if (sram_attached) 93 return 0; 94 95 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 96 ia->ia_addr = SRAM_ADDR; 97 98 /* Fixed parameter */ 99 if (ia->ia_addr != SRAM_ADDR) 100 return 0; 101 102 return 1; 103 } 104 105 void 106 sramattach(device_t parent, device_t self, void *aux) 107 { 108 struct sram_softc *sc = device_private(self); 109 struct intio_attach_args *ia = aux; 110 bus_space_tag_t iot; 111 bus_space_handle_t ioh; 112 113 /* Map I/O space */ 114 iot = ia->ia_bst; 115 if (bus_space_map(iot, ia->ia_addr, SRAM_SIZE, 0, &ioh)) 116 goto out; 117 118 /* Initialize sc */ 119 sc->sc_iot = iot; 120 sc->sc_ioh = ioh; 121 122 sc->sc_flags = 0; 123 aprint_normal(": 16k bytes accessible\n"); 124 sram_attached = 1; 125 return; 126 127 out: 128 aprint_normal(": not accessible\n"); 129 } 130 131 132 /*ARGSUSED*/ 133 int 134 sramopen(dev_t dev, int flags, int mode, struct lwp *l) 135 { 136 struct sram_softc *sc; 137 138 DPRINTF(SRAM_DEBUG_OPEN, ("Sram open\n")); 139 140 sc = device_lookup_private(&sram_cd, minor(dev)); 141 if (sc == NULL) 142 return ENXIO; 143 144 if (sc->sc_flags & SRF_OPEN) 145 return EBUSY; 146 147 sc->sc_flags |= SRF_OPEN; 148 if (flags & FREAD) 149 sc->sc_flags |= SRF_READ; 150 if (flags & FWRITE) 151 sc->sc_flags |= SRF_WRITE; 152 153 return 0; 154 } 155 156 /*ARGSUSED*/ 157 int 158 sramclose(dev_t dev, int flags, int mode, struct lwp *l) 159 { 160 struct sram_softc *sc; 161 162 DPRINTF(SRAM_DEBUG_CLOSE, ("Sram close\n")); 163 164 sc = device_lookup_private(&sram_cd, minor(dev)); 165 if (sc == NULL) 166 return ENXIO; 167 168 if (sc->sc_flags & SRF_OPEN) { 169 sc->sc_flags = 0; 170 } 171 sc->sc_flags &= ~(SRF_READ|SRF_WRITE); 172 173 return 0; 174 } 175 176 /*ARGSUSED*/ 177 int 178 sramioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 179 { 180 int error = 0; 181 struct sram_io *sram_io; 182 struct sram_softc *sc; 183 184 DPRINTF(SRAM_DEBUG_IOCTL, ("Sram ioctl cmd=%lx\n", cmd)); 185 186 sc = device_lookup_private(&sram_cd, minor(dev)); 187 if (sc == NULL) 188 return ENXIO; 189 190 sram_io = (struct sram_io *)data; 191 if (sram_io == NULL) 192 return EFAULT; 193 194 switch (cmd) { 195 case SIOGSRAM: 196 if ((sc->sc_flags & SRF_READ) == 0) 197 return EPERM; 198 DPRINTF(SRAM_DEBUG_IOCTL, 199 ("Sram ioctl SIOGSRAM address=%p\n", data)); 200 DPRINTF(SRAM_DEBUG_IOCTL, 201 ("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset)); 202 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 203 return EFAULT; 204 bus_space_read_region_1(sc->sc_iot, sc->sc_ioh, sram_io->offset, 205 (uint8_t *)&sram_io->sram, SRAM_IO_SIZE); 206 break; 207 case SIOPSRAM: 208 if ((sc->sc_flags & SRF_WRITE) == 0) 209 return EPERM; 210 DPRINTF(SRAM_DEBUG_IOCTL, 211 ("Sram ioctl SIOPSRAM address=%p\n", data)); 212 DPRINTF(SRAM_DEBUG_IOCTL, 213 ("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset)); 214 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 215 return EFAULT; 216 #ifdef DEBUG 217 if (sramdebug & SRAM_DEBUG_DONTDOIT) { 218 printf("Sram ioctl SIOPSRAM: skipping actual write\n"); 219 break; 220 } 221 #endif 222 intio_set_sysport_sramwp(0x31); 223 bus_space_write_region_1(sc->sc_iot, sc->sc_ioh, 224 sram_io->offset, (uint8_t *)&sram_io->sram, 225 SRAM_IO_SIZE); 226 intio_set_sysport_sramwp(0x00); 227 break; 228 default: 229 error = EINVAL; 230 break; 231 } 232 return error; 233 } 234