nvram.c revision 1.7
1 /* $NetBSD: nvram.c,v 1.7 2002/10/02 05:30:42 thorpej 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 #include <sys/conf.h> 42 43 #include <machine/autoconf.h> 44 #include <machine/pio.h> 45 46 #define NVRAM_NONE 0 47 #define NVRAM_IOMEM 1 48 #define NVRAM_PORT 2 49 50 #define NVRAM_SIZE 0x2000 51 52 static void nvram_attach __P((struct device *, struct device *, void *)); 53 static int nvram_match __P((struct device *, struct cfdata *, void *)); 54 55 struct nvram_softc { 56 struct device sc_dev; 57 int nv_type; 58 char *nv_port; 59 char *nv_data; 60 }; 61 62 CFATTACH_DECL(nvram, sizeof(struct nvram_softc), 63 nvram_match, nvram_attach, NULL, NULL); 64 65 extern struct cfdriver nvram_cd; 66 67 dev_type_read(nvramread); 68 dev_type_write(nvramwrite); 69 dev_type_mmap(nvrammmap); 70 71 const struct cdevsw nvram_cdevsw = { 72 nullopen, nullclose, nvramread, nvramwrite, noioctl, 73 nostop, notty, nopoll, nvrammmap, 74 }; 75 76 int 77 nvram_match(parent, cf, aux) 78 struct device *parent; 79 struct cfdata *cf; 80 void *aux; 81 { 82 struct confargs *ca = aux; 83 84 if (strcmp(ca->ca_name, "nvram") != 0) 85 return 0; 86 87 if (ca->ca_nreg == 0) 88 return 0; 89 90 return 1; 91 } 92 93 void 94 nvram_attach(parent, self, aux) 95 struct device *parent, *self; 96 void *aux; 97 { 98 struct nvram_softc *sc = (struct nvram_softc *)self; 99 struct confargs *ca = aux; 100 int *reg = ca->ca_reg; 101 102 printf("\n"); 103 104 switch (ca->ca_nreg) { 105 106 case 8: /* untested */ 107 sc->nv_type = NVRAM_IOMEM; 108 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 109 break; 110 111 case 16: 112 sc->nv_type = NVRAM_PORT; 113 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 114 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3]); 115 break; 116 117 case 0: 118 default: 119 sc->nv_type = NVRAM_NONE; 120 return; 121 } 122 } 123 124 int 125 nvramread(dev, uio, flag) 126 dev_t dev; 127 struct uio *uio; 128 int flag; 129 { 130 struct nvram_softc *sc; 131 u_int off, cnt; 132 int i; 133 int error = 0; 134 char *buf; 135 136 sc = nvram_cd.cd_devs[0]; 137 138 off = uio->uio_offset; 139 cnt = uio->uio_resid; 140 141 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 142 return EFAULT; 143 144 if (off + cnt > NVRAM_SIZE) 145 cnt = NVRAM_SIZE - off; 146 147 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 148 if (buf == NULL) { 149 error = EAGAIN; 150 goto out; 151 } 152 153 switch (sc->nv_type) { 154 155 case NVRAM_IOMEM: 156 for (i = 0; i < NVRAM_SIZE; i++) 157 buf[i] = sc->nv_data[i * 16]; 158 159 break; 160 161 case NVRAM_PORT: 162 for (i = 0; i < NVRAM_SIZE; i += 32) { 163 int j; 164 165 out8(sc->nv_port, i / 32); 166 for (j = 0; j < 32; j++) { 167 buf[i + j] = sc->nv_data[j * 16]; 168 } 169 } 170 break; 171 172 default: 173 goto out; 174 } 175 176 error = uiomove(buf + off, cnt, uio); 177 178 out: 179 if (buf) 180 free(buf, M_DEVBUF); 181 182 return error; 183 } 184 185 int 186 nvramwrite(dev, uio, flag) 187 dev_t dev; 188 struct uio *uio; 189 int flag; 190 { 191 return ENXIO; 192 } 193 194 paddr_t 195 nvrammmap(dev, off, prot) 196 dev_t dev; 197 off_t off; 198 int prot; 199 { 200 return -1; 201 } 202
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