/*      $NetBSD: nvram.c,v 1.20 2014/07/25 08:10:34 dholland Exp $      */

/*-
 * Copyright (C) 1998   Internet Research Institute, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by
 *      Internet Research Institute, Inc.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nvram.c,v 1.20 2014/07/25 08:10:34 dholland Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/event.h>

#include <machine/autoconf.h>
#include <machine/pio.h>

#define NVRAM_NONE  0
#define NVRAM_IOMEM 1
#define NVRAM_PORT  2

#define NVRAM_SIZE 0x2000

static void nvram_attach(device_t, device_t, void *);
static int nvram_match(device_t, cfdata_t, void *);

struct nvram_softc {
        int nv_type;
        char *nv_port;
        char *nv_data;
};

CFATTACH_DECL_NEW(nvram, sizeof(struct nvram_softc),
    nvram_match, nvram_attach, NULL, NULL);

extern struct cfdriver nvram_cd;

dev_type_read(nvramread);
dev_type_write(nvramwrite);
dev_type_mmap(nvrammmap);

const struct cdevsw nvram_cdevsw = {
        .d_open = nullopen,
        .d_close = nullclose,
        .d_read = nvramread,
        .d_write = nvramwrite,
        .d_ioctl = noioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = nopoll,
        .d_mmap = nvrammmap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = 0
};

int
nvram_match(device_t parent, cfdata_t cf, void *aux)
{
        struct confargs *ca = aux;

        if (strcmp(ca->ca_name, "nvram") != 0)
                return 0;

        if (ca->ca_nreg == 0)
                return 0;

        return 1;
}

void
nvram_attach(device_t parent, device_t self, void *aux)
{
        struct nvram_softc *sc = device_private(self);
        struct confargs *ca = aux;
        int *reg = ca->ca_reg;

        printf("\n");

        switch (ca->ca_nreg) {

        case 8:                                         /* untested */
                sc->nv_type = NVRAM_IOMEM;
                sc->nv_data = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
                break;

        case 16:
                sc->nv_type = NVRAM_PORT;
                sc->nv_port = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false);
                sc->nv_data = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false);
                break;

        case 0:
        default:
                sc->nv_type = NVRAM_NONE;
                return;
        }
}

int
nvramread(dev_t dev, struct uio *uio, int flag)
{
        struct nvram_softc *sc;
        u_int off, cnt;
        int i;
        int error = 0;
        char *buf;

        sc = device_lookup_private(&nvram_cd, 0);

        off = uio->uio_offset;
        cnt = uio->uio_resid;

        if (off > NVRAM_SIZE || cnt > NVRAM_SIZE)
                return EFAULT;

        if (off + cnt > NVRAM_SIZE)
                cnt = NVRAM_SIZE - off;

        buf = malloc(NVRAM_SIZE, M_DEVBUF, M_WAITOK);
        if (buf == NULL) {
                error = EAGAIN;
                goto out;
        }

        switch (sc->nv_type) {

        case NVRAM_IOMEM:
                for (i = 0; i < NVRAM_SIZE; i++)
                        buf[i] = sc->nv_data[i * 16];

                break;

        case NVRAM_PORT:
                for (i = 0; i < NVRAM_SIZE; i += 32) {
                        int j;

                        out8(sc->nv_port, i / 32);
                        for (j = 0; j < 32; j++) {
                                buf[i + j] = sc->nv_data[j * 16];
                        }
                }
                break;

        default:
                goto out;
        }

        error = uiomove(buf + off, cnt, uio);

out:
        if (buf)
                free(buf, M_DEVBUF);

        return error;
}

int
nvramwrite(dev_t dev, struct uio *uio, int flag)
{
        return ENXIO;
}

paddr_t
nvrammmap(dev_t dev, off_t off, int prot)
{
        return -1;
}