1 /* $NetBSD: nvram.c,v 1.18 2012/10/27 17:18:00 chs 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 1.18 2012/10/27 17:18:00 chs 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 nullopen, nullclose, nvramread, nvramwrite, noioctl, 75 nostop, notty, nopoll, nvrammmap, nokqfilter, 76 }; 77 78 int 79 nvram_match(device_t parent, cfdata_t cf, void *aux) 80 { 81 struct confargs *ca = aux; 82 83 if (strcmp(ca->ca_name, "nvram") != 0) 84 return 0; 85 86 if (ca->ca_nreg == 0) 87 return 0; 88 89 return 1; 90 } 91 92 void 93 nvram_attach(device_t parent, device_t self, void *aux) 94 { 95 struct nvram_softc *sc = device_private(self); 96 struct confargs *ca = aux; 97 int *reg = ca->ca_reg; 98 99 printf("\n"); 100 101 switch (ca->ca_nreg) { 102 103 case 8: /* untested */ 104 sc->nv_type = NVRAM_IOMEM; 105 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 106 break; 107 108 case 16: 109 sc->nv_type = NVRAM_PORT; 110 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 111 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false); 112 break; 113 114 case 0: 115 default: 116 sc->nv_type = NVRAM_NONE; 117 return; 118 } 119 } 120 121 int 122 nvramread(dev_t dev, struct uio *uio, int flag) 123 { 124 struct nvram_softc *sc; 125 u_int off, cnt; 126 int i; 127 int error = 0; 128 char *buf; 129 130 sc = device_lookup_private(&nvram_cd, 0); 131 132 off = uio->uio_offset; 133 cnt = uio->uio_resid; 134 135 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 136 return EFAULT; 137 138 if (off + cnt > NVRAM_SIZE) 139 cnt = NVRAM_SIZE - off; 140 141 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 142 if (buf == NULL) { 143 error = EAGAIN; 144 goto out; 145 } 146 147 switch (sc->nv_type) { 148 149 case NVRAM_IOMEM: 150 for (i = 0; i < NVRAM_SIZE; i++) 151 buf[i] = sc->nv_data[i * 16]; 152 153 break; 154 155 case NVRAM_PORT: 156 for (i = 0; i < NVRAM_SIZE; i += 32) { 157 int j; 158 159 out8(sc->nv_port, i / 32); 160 for (j = 0; j < 32; j++) { 161 buf[i + j] = sc->nv_data[j * 16]; 162 } 163 } 164 break; 165 166 default: 167 goto out; 168 } 169 170 error = uiomove(buf + off, cnt, uio); 171 172 out: 173 if (buf) 174 free(buf, M_DEVBUF); 175 176 return error; 177 } 178 179 int 180 nvramwrite(dev_t dev, struct uio *uio, int flag) 181 { 182 return ENXIO; 183 } 184 185 paddr_t 186 nvrammmap(dev_t dev, off_t off, int prot) 187 { 188 return -1; 189 } 190