1 /* $NetBSD: nvram.c,v 1.19 2014/03/16 05:20:25 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 1.19 2014/03/16 05:20:25 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_flag = 0 85 }; 86 87 int 88 nvram_match(device_t parent, cfdata_t cf, void *aux) 89 { 90 struct confargs *ca = aux; 91 92 if (strcmp(ca->ca_name, "nvram") != 0) 93 return 0; 94 95 if (ca->ca_nreg == 0) 96 return 0; 97 98 return 1; 99 } 100 101 void 102 nvram_attach(device_t parent, device_t self, void *aux) 103 { 104 struct nvram_softc *sc = device_private(self); 105 struct confargs *ca = aux; 106 int *reg = ca->ca_reg; 107 108 printf("\n"); 109 110 switch (ca->ca_nreg) { 111 112 case 8: /* untested */ 113 sc->nv_type = NVRAM_IOMEM; 114 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 115 break; 116 117 case 16: 118 sc->nv_type = NVRAM_PORT; 119 sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); 120 sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false); 121 break; 122 123 case 0: 124 default: 125 sc->nv_type = NVRAM_NONE; 126 return; 127 } 128 } 129 130 int 131 nvramread(dev_t dev, struct uio *uio, int flag) 132 { 133 struct nvram_softc *sc; 134 u_int off, cnt; 135 int i; 136 int error = 0; 137 char *buf; 138 139 sc = device_lookup_private(&nvram_cd, 0); 140 141 off = uio->uio_offset; 142 cnt = uio->uio_resid; 143 144 if (off > NVRAM_SIZE || cnt > NVRAM_SIZE) 145 return EFAULT; 146 147 if (off + cnt > NVRAM_SIZE) 148 cnt = NVRAM_SIZE - off; 149 150 buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK); 151 if (buf == NULL) { 152 error = EAGAIN; 153 goto out; 154 } 155 156 switch (sc->nv_type) { 157 158 case NVRAM_IOMEM: 159 for (i = 0; i < NVRAM_SIZE; i++) 160 buf[i] = sc->nv_data[i * 16]; 161 162 break; 163 164 case NVRAM_PORT: 165 for (i = 0; i < NVRAM_SIZE; i += 32) { 166 int j; 167 168 out8(sc->nv_port, i / 32); 169 for (j = 0; j < 32; j++) { 170 buf[i + j] = sc->nv_data[j * 16]; 171 } 172 } 173 break; 174 175 default: 176 goto out; 177 } 178 179 error = uiomove(buf + off, cnt, uio); 180 181 out: 182 if (buf) 183 free(buf, M_DEVBUF); 184 185 return error; 186 } 187 188 int 189 nvramwrite(dev_t dev, struct uio *uio, int flag) 190 { 191 return ENXIO; 192 } 193 194 paddr_t 195 nvrammmap(dev_t dev, off_t off, int prot) 196 { 197 return -1; 198 } 199