1 /* $NetBSD: nvram.c,v 1.20 2014/07/25 08:10:34 dholland 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 1.20 2014/07/25 08:10:34 dholland 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(device_t, device_t, void *); 56 static int nvram_match(device_t, cfdata_t, void *); 57 58 struct nvram_softc { 59 int nv_type; 60 char *nv_port; 61 char *nv_data; 62 }; 63 64 CFATTACH_DECL_NEW(nvram, sizeof(struct nvram_softc), 65 nvram_match, nvram_attach, NULL, NULL); 66 67 extern struct cfdriver nvram_cd; 68 69 dev_type_read(nvramread); 70 dev_type_write(nvramwrite); 71 dev_type_mmap(nvrammmap); 72 73 const struct cdevsw nvram_cdevsw = { 74 .d_open = nullopen, 75 .d_close = nullclose, 76 .d_read = nvramread, 77 .d_write = nvramwrite, 78 .d_ioctl = noioctl, 79 .d_stop = nostop, 80 .d_tty = notty, 81 .d_poll = nopoll, 82 .d_mmap = nvrammmap, 83 .d_kqfilter = nokqfilter, 84 .d_discard = nodiscard, 85 .d_flag = 0 86 }; 87 88 int 89 nvram_match(device_t parent, cfdata_t cf, void *aux) 90 { 91 struct confargs *ca = aux; 92 93 if (strcmp(ca->ca_name, "nvram") != 0) 94 return 0; 95 96 if (ca->ca_nreg == 0) 97 return 0; 98 99 return 1; 100 } 101 102 void 103 nvram_attach(device_t parent, device_t self, void *aux) 104 { 105 struct nvram_softc *sc = device_private(self); 106 struct confargs *ca = aux; 107 int *reg = ca->ca_reg; 108 109 printf("\n"); 110 111 switch (ca->ca_nreg) { 112 113 case 8: /* untested */ 114 sc->nv_type = NVRAM_IOMEM; 115 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 116 break; 117 118 case 16: 119 sc->nv_type = NVRAM_PORT; 120 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 121 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false); 122 break; 123 124 case 0: 125 default: 126 sc->nv_type = NVRAM_NONE; 127 return; 128 } 129 } 130 131 int 132 nvramread(dev_t dev, struct uio *uio, int flag) 133 { 134 struct nvram_softc *sc; 135 u_int off, cnt; 136 int i; 137 int error = 0; 138 char *buf; 139 140 sc = device_lookup_private(&nvram_cd, 0); 141 142 off = uio->uio_offset; 143 cnt = uio->uio_resid; 144 145 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 146 return EFAULT; 147 148 if (off + cnt > NVRAM_SIZE) 149 cnt = NVRAM_SIZE - off; 150 151 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 152 if (buf == NULL) { 153 error = EAGAIN; 154 goto out; 155 } 156 157 switch (sc->nv_type) { 158 159 case NVRAM_IOMEM: 160 for (i = 0; i < NVRAM_SIZE; i++) 161 buf[i] = sc->nv_data[i * 16]; 162 163 break; 164 165 case NVRAM_PORT: 166 for (i = 0; i < NVRAM_SIZE; i += 32) { 167 int j; 168 169 out8(sc->nv_port, i / 32); 170 for (j = 0; j < 32; j++) { 171 buf[i + j] = sc->nv_data[j * 16]; 172 } 173 } 174 break; 175 176 default: 177 goto out; 178 } 179 180 error = uiomove(buf + off, cnt, uio); 181 182 out: 183 if (buf) 184 free(buf, M_DEVBUF); 185 186 return error; 187 } 188 189 int 190 nvramwrite(dev_t dev, struct uio *uio, int flag) 191 { 192 return ENXIO; 193 } 194 195 paddr_t 196 nvrammmap(dev_t dev, off_t off, int prot) 197 { 198 return -1; 199 } 200
Indexes created Sun Sep 21 14:09:52 GMT 2025