191 lines
4.4 KiB
C
191 lines
4.4 KiB
C
/* $NetBSD: nvram.c,v 1.17 2011/06/30 00:52:57 matt Exp $ */
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/*-
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* Copyright (C) 1998 Internet Research Institute, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by
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* Internet Research Institute, Inc.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: nvram.c,v 1.17 2011/06/30 00:52:57 matt Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/malloc.h>
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#include <sys/event.h>
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#include <machine/autoconf.h>
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#include <machine/pio.h>
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#define NVRAM_NONE 0
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#define NVRAM_IOMEM 1
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#define NVRAM_PORT 2
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#define NVRAM_SIZE 0x2000
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static void nvram_attach(device_t, device_t, void *);
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static int nvram_match(device_t, cfdata_t, void *);
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struct nvram_softc {
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struct device sc_dev;
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int nv_type;
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char *nv_port;
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char *nv_data;
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};
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CFATTACH_DECL(nvram, sizeof(struct nvram_softc),
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nvram_match, nvram_attach, NULL, NULL);
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extern struct cfdriver nvram_cd;
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dev_type_read(nvramread);
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dev_type_write(nvramwrite);
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dev_type_mmap(nvrammmap);
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const struct cdevsw nvram_cdevsw = {
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nullopen, nullclose, nvramread, nvramwrite, noioctl,
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nostop, notty, nopoll, nvrammmap, nokqfilter,
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};
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int
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nvram_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct confargs *ca = aux;
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if (strcmp(ca->ca_name, "nvram") != 0)
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return 0;
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if (ca->ca_nreg == 0)
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return 0;
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return 1;
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}
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void
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nvram_attach(device_t parent, device_t self, void *aux)
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{
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struct nvram_softc *sc = device_private(self);
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struct confargs *ca = aux;
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int *reg = ca->ca_reg;
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printf("\n");
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switch (ca->ca_nreg) {
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case 8: /* untested */
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sc->nv_type = NVRAM_IOMEM;
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sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
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break;
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case 16:
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sc->nv_type = NVRAM_PORT;
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sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
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sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false);
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break;
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case 0:
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default:
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sc->nv_type = NVRAM_NONE;
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return;
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}
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}
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int
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nvramread(dev_t dev, struct uio *uio, int flag)
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{
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struct nvram_softc *sc;
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u_int off, cnt;
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int i;
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int error = 0;
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char *buf;
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sc = device_lookup_private(&nvram_cd, 0);
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off = uio->uio_offset;
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cnt = uio->uio_resid;
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if (off > NVRAM_SIZE || cnt > NVRAM_SIZE)
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return EFAULT;
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if (off + cnt > NVRAM_SIZE)
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cnt = NVRAM_SIZE - off;
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buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK);
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if (buf == NULL) {
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error = EAGAIN;
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goto out;
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}
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switch (sc->nv_type) {
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case NVRAM_IOMEM:
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for (i = 0; i < NVRAM_SIZE; i++)
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buf[i] = sc->nv_data[i * 16];
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break;
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case NVRAM_PORT:
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for (i = 0; i < NVRAM_SIZE; i += 32) {
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int j;
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out8(sc->nv_port, i / 32);
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for (j = 0; j < 32; j++) {
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buf[i + j] = sc->nv_data[j * 16];
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}
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}
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break;
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default:
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goto out;
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}
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error = uiomove(buf + off, cnt, uio);
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out:
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if (buf)
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free(buf, M_DEVBUF);
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return error;
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}
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int
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nvramwrite(dev_t dev, struct uio *uio, int flag)
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{
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return ENXIO;
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}
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paddr_t
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nvrammmap(dev_t dev, off_t off, int prot)
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{
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return -1;
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}
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