1 /* $NetBSD: sram.c,v 1.19 2014/03/16 05:20:26 dholland 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 1.19 2014/03/16 05:20:26 dholland 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 .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_flag = 0 89 }; 90 91 static int sram_attached; 92 93 /* 94 * functions for probeing. 95 */ 96 int 97 srammatch(device_t parent, cfdata_t cf, void *aux) 98 { 99 struct intio_attach_args *ia = aux; 100 101 if (sram_attached) 102 return 0; 103 104 if (ia->ia_addr == INTIOCF_ADDR_DEFAULT) 105 ia->ia_addr = SRAM_ADDR; 106 107 /* Fixed parameter */ 108 if (ia->ia_addr != SRAM_ADDR) 109 return 0; 110 111 return 1; 112 } 113 114 void 115 sramattach(device_t parent, device_t self, void *aux) 116 { 117 struct sram_softc *sc = device_private(self); 118 struct intio_attach_args *ia = aux; 119 bus_space_tag_t iot; 120 bus_space_handle_t ioh; 121 122 /* Map I/O space */ 123 iot = ia->ia_bst; 124 if (bus_space_map(iot, ia->ia_addr, SRAM_SIZE, 0, &ioh)) 125 goto out; 126 127 /* Initialize sc */ 128 sc->sc_iot = iot; 129 sc->sc_ioh = ioh; 130 131 sc->sc_flags = 0; 132 aprint_normal(": 16k bytes accessible\n"); 133 sram_attached = 1; 134 return; 135 136 out: 137 aprint_normal(": not accessible\n"); 138 } 139 140 141 /*ARGSUSED*/ 142 int 143 sramopen(dev_t dev, int flags, int mode, struct lwp *l) 144 { 145 struct sram_softc *sc; 146 147 DPRINTF(SRAM_DEBUG_OPEN, ("Sram open\n")); 148 149 sc = device_lookup_private(&sram_cd, minor(dev)); 150 if (sc == NULL) 151 return ENXIO; 152 153 if (sc->sc_flags & SRF_OPEN) 154 return EBUSY; 155 156 sc->sc_flags |= SRF_OPEN; 157 if (flags & FREAD) 158 sc->sc_flags |= SRF_READ; 159 if (flags & FWRITE) 160 sc->sc_flags |= SRF_WRITE; 161 162 return 0; 163 } 164 165 /*ARGSUSED*/ 166 int 167 sramclose(dev_t dev, int flags, int mode, struct lwp *l) 168 { 169 struct sram_softc *sc; 170 171 DPRINTF(SRAM_DEBUG_CLOSE, ("Sram close\n")); 172 173 sc = device_lookup_private(&sram_cd, minor(dev)); 174 if (sc == NULL) 175 return ENXIO; 176 177 if (sc->sc_flags & SRF_OPEN) { 178 sc->sc_flags = 0; 179 } 180 sc->sc_flags &= ~(SRF_READ|SRF_WRITE); 181 182 return 0; 183 } 184 185 /*ARGSUSED*/ 186 int 187 sramioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 188 { 189 int error = 0; 190 struct sram_io *sram_io; 191 struct sram_softc *sc; 192 193 DPRINTF(SRAM_DEBUG_IOCTL, ("Sram ioctl cmd=%lx\n", cmd)); 194 195 sc = device_lookup_private(&sram_cd, minor(dev)); 196 if (sc == NULL) 197 return ENXIO; 198 199 sram_io = (struct sram_io *)data; 200 if (sram_io == NULL) 201 return EFAULT; 202 203 switch (cmd) { 204 case SIOGSRAM: 205 if ((sc->sc_flags & SRF_READ) == 0) 206 return EPERM; 207 DPRINTF(SRAM_DEBUG_IOCTL, 208 ("Sram ioctl SIOGSRAM address=%p\n", data)); 209 DPRINTF(SRAM_DEBUG_IOCTL, 210 ("Sram ioctl SIOGSRAM offset=%x\n", sram_io->offset)); 211 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 212 return EFAULT; 213 bus_space_read_region_1(sc->sc_iot, sc->sc_ioh, sram_io->offset, 214 (uint8_t *)&sram_io->sram, SRAM_IO_SIZE); 215 break; 216 case SIOPSRAM: 217 if ((sc->sc_flags & SRF_WRITE) == 0) 218 return EPERM; 219 DPRINTF(SRAM_DEBUG_IOCTL, 220 ("Sram ioctl SIOPSRAM address=%p\n", data)); 221 DPRINTF(SRAM_DEBUG_IOCTL, 222 ("Sram ioctl SIOPSRAM offset=%x\n", sram_io->offset)); 223 if (sram_io->offset + SRAM_IO_SIZE > SRAM_SIZE) 224 return EFAULT; 225 #ifdef DEBUG 226 if (sramdebug & SRAM_DEBUG_DONTDOIT) { 227 printf("Sram ioctl SIOPSRAM: skipping actual write\n"); 228 break; 229 } 230 #endif 231 intio_set_sysport_sramwp(0x31); 232 bus_space_write_region_1(sc->sc_iot, sc->sc_ioh, 233 sram_io->offset, (uint8_t *)&sram_io->sram, 234 SRAM_IO_SIZE); 235 intio_set_sysport_sramwp(0x00); 236 break; 237 default: 238 error = EINVAL; 239 break; 240 } 241 return error; 242 } 243