1 /* $NetBSD: nvram.c,v 1.15 2009/03/14 21:04:11 dsl 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/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: nvram.c,v 1.15 2009/03/14 21:04:11 dsl Exp $"); 36 37 #include <sys/types.h> 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/conf.h> 41 #include <sys/kernel.h> 42 #include <sys/device.h> 43 #include <sys/malloc.h> 44 #include <sys/event.h> 45 46 #include <machine/autoconf.h> 47 #include <machine/pio.h> 48 49 #define NVRAM_NONE 0 50 #define NVRAM_IOMEM 1 51 #define NVRAM_PORT 2 52 53 #define NVRAM_SIZE 0x2000 54 55 static void nvram_attach(struct device *, struct device *, void *); 56 static int nvram_match(struct device *, struct cfdata *, void *); 57 58 struct nvram_softc { 59 struct device sc_dev; 60 int nv_type; 61 char *nv_port; 62 char *nv_data; 63 }; 64 65 CFATTACH_DECL(nvram, sizeof(struct nvram_softc), 66 nvram_match, nvram_attach, NULL, NULL); 67 68 extern struct cfdriver nvram_cd; 69 70 dev_type_read(nvramread); 71 dev_type_write(nvramwrite); 72 dev_type_mmap(nvrammmap); 73 74 const struct cdevsw nvram_cdevsw = { 75 nullopen, nullclose, nvramread, nvramwrite, noioctl, 76 nostop, notty, nopoll, nvrammmap, nokqfilter, 77 }; 78 79 int 80 nvram_match(struct device *parent, struct cfdata *cf, 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(struct device *parent, struct device *self, void *aux) 95 { 96 struct nvram_softc *sc = (struct nvram_softc *)self; 97 struct confargs *ca = aux; 98 int *reg = ca->ca_reg; 99 100 printf("\n"); 101 102 switch (ca->ca_nreg) { 103 104 case 8: /* untested */ 105 sc->nv_type = NVRAM_IOMEM; 106 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 107 break; 108 109 case 16: 110 sc->nv_type = NVRAM_PORT; 111 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); 112 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3]); 113 break; 114 115 case 0: 116 default: 117 sc->nv_type = NVRAM_NONE; 118 return; 119 } 120 } 121 122 int 123 nvramread(dev_t dev, struct uio *uio, int flag) 124 { 125 struct nvram_softc *sc; 126 u_int off, cnt; 127 int i; 128 int error = 0; 129 char *buf; 130 131 sc = device_lookup_private(&nvram_cd, 0); 132 133 off = uio->uio_offset; 134 cnt = uio->uio_resid; 135 136 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 137 return EFAULT; 138 139 if (off + cnt > NVRAM_SIZE) 140 cnt = NVRAM_SIZE - off; 141 142 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 143 if (buf == NULL) { 144 error = EAGAIN; 145 goto out; 146 } 147 148 switch (sc->nv_type) { 149 150 case NVRAM_IOMEM: 151 for (i = 0; i < NVRAM_SIZE; i++) 152 buf[i] = sc->nv_data[i * 16]; 153 154 break; 155 156 case NVRAM_PORT: 157 for (i = 0; i < NVRAM_SIZE; i += 32) { 158 int j; 159 160 out8(sc->nv_port, i / 32); 161 for (j = 0; j < 32; j++) { 162 buf[i + j] = sc->nv_data[j * 16]; 163 } 164 } 165 break; 166 167 default: 168 goto out; 169 } 170 171 error = uiomove(buf + off, cnt, uio); 172 173 out: 174 if (buf) 175 free(buf, M_DEVBUF); 176 177 return error; 178 } 179 180 int 181 nvramwrite(dev_t dev, struct uio *uio, int flag) 182 { 183 return ENXIO; 184 } 185 186 paddr_t 187 nvrammmap(dev_t dev, off_t off, int prot) 188 { 189 return -1; 190 } 191