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nvram.c revision 1.17 
      1 /*	$NetBSD: nvram.c,v 1.17 2011/06/30 00:52:57 matt 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 1.17 2011/06/30 00:52:57 matt 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 	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(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux)
     95 {
     96 	struct nvram_softc *sc = device_private(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], false);
    107 		break;
    108 
    109 	case 16:
    110 		sc->nv_type = NVRAM_PORT;
    111 		sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
    112 		sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false);
    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