/*      $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;
}