nvram.c revision 1.4
1 /* $NetBSD: nvram.c,v 1.4 2001/06/08 00:32:02 matt Exp $ */ 2 3 /*- 4 * Copyright (C) 1998 Internet Research Institute, Inc. 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 18 * Internet Research Institute, Inc. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/types.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/conf.h> 38 #include <sys/kernel.h> 39 #include <sys/device.h> 40 #include <sys/malloc.h> 41 42 #include <machine/autoconf.h> 43 #include <machine/pio.h> 44 45 #define NVRAM_NONE 0 46 #define NVRAM_IOMEM 1 47 #define NVRAM_PORT 2 48 49 #define NVRAM_SIZE 0x2000 50 51 cdev_decl(nvram); 52 53 static void nvram_attach __P((struct device *, struct device *, void *)); 54 static int nvram_match __P((struct device *, struct cfdata *, void *)); 55 56 struct nvram_softc { 57 struct device sc_dev; 58 int nv_type; 59 char *nv_port; 60 char *nv_data; 61 }; 62 63 struct cfattach nvram_ca = { 64 sizeof(struct nvram_softc), nvram_match, nvram_attach 65 }; 66 67 extern struct cfdriver nvram_cd; 68 69 int 70 nvram_match(parent, cf, aux) 71 struct device *parent; 72 struct cfdata *cf; 73 void *aux; 74 { 75 struct confargs *ca = aux; 76 77 if (strcmp(ca->ca_name, "nvram") != 0) 78 return 0; 79 80 if (ca->ca_nreg == 0) 81 return 0; 82 83 return 1; 84 } 85 86 void 87 nvram_attach(parent, self, aux) 88 struct device *parent, *self; 89 void *aux; 90 { 91 struct nvram_softc *sc = (struct nvram_softc *)self; 92 struct confargs *ca = aux; 93 int *reg = ca->ca_reg; 94 95 printf("\n"); 96 97 switch (ca->ca_nreg) { 98 99 case 8: /* untested */ 100 sc->nv_type = NVRAM_IOMEM; 101 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 102 break; 103 104 case 16: 105 sc->nv_type = NVRAM_PORT; 106 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 107 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3]); 108 break; 109 110 case 0: 111 default: 112 sc->nv_type = NVRAM_NONE; 113 return; 114 } 115 } 116 117 int 118 nvramopen(dev, flag, mode, p) 119 dev_t dev; 120 int flag, mode; 121 struct proc *p; 122 { 123 return 0; 124 } 125 126 int 127 nvramclose(dev, flag, mode, p) 128 dev_t dev; 129 int flag, mode; 130 struct proc *p; 131 { 132 return 0; 133 } 134 135 int 136 nvramread(dev, uio, flag) 137 dev_t dev; 138 struct uio *uio; 139 int flag; 140 { 141 struct nvram_softc *sc; 142 u_int off, cnt; 143 int i; 144 int error = 0; 145 char *buf; 146 147 sc = nvram_cd.cd_devs[0]; 148 149 off = uio->uio_offset; 150 cnt = uio->uio_resid; 151 152 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 153 return EFAULT; 154 155 if (off + cnt > NVRAM_SIZE) 156 cnt = NVRAM_SIZE - off; 157 158 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 159 if (buf == NULL) { 160 error = EAGAIN; 161 goto out; 162 } 163 164 switch (sc->nv_type) { 165 166 case NVRAM_IOMEM: 167 for (i = 0; i < NVRAM_SIZE; i++) 168 buf[i] = sc->nv_data[i * 16]; 169 170 break; 171 172 case NVRAM_PORT: 173 for (i = 0; i < NVRAM_SIZE; i += 32) { 174 int j; 175 176 out8(sc->nv_port, i / 32); 177 for (j = 0; j < 32; j++) { 178 buf[i + j] = sc->nv_data[j * 16]; 179 } 180 } 181 break; 182 183 default: 184 goto out; 185 } 186 187 error = uiomove(buf + off, cnt, uio); 188 189 out: 190 if (buf) 191 free(buf, M_DEVBUF); 192 193 return error; 194 } 195 196 int 197 nvramwrite(dev, uio, flag) 198 dev_t dev; 199 struct uio *uio; 200 int flag; 201 { 202 return ENXIO; 203 } 204 205 int 206 nvramioctl(dev, cmd, data, flag, p) 207 dev_t dev; 208 u_long cmd; 209 caddr_t data; 210 int flag; 211 struct proc *p; 212 { 213 return ENOTTY; 214 } 215 216 paddr_t 217 nvrammmap(dev, off, prot) 218 dev_t dev; 219 off_t off; 220 int prot; 221 { 222 return -1; 223 } 224
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