/* $NetBSD: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $ */

/*-
* Copyright (c) 2017 Jared McNeill <[email protected]>
* 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.
*
* 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: qemufwcfg_acpi.c,v 1.2 2021/01/29 15:49:55 thorpej Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <sys/mutex.h>
#include <sys/bus.h>

#include <dev/acpi/acpireg.h>
#include <dev/acpi/acpivar.h>

#include <dev/ic/qemufwcfgvar.h>

#define _COMPONENT      ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME        ("qemufwcfg_acpi")

static int      fwcfg_acpi_match(device_t, cfdata_t, void *);
static void     fwcfg_acpi_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(qemufwcfg_acpi, sizeof(struct fwcfg_softc),
   fwcfg_acpi_match,
   fwcfg_acpi_attach,
   NULL,
   NULL
);

static const struct device_compatible_entry compat_data[] = {
       { .compat = "QEMU0002" },
       DEVICE_COMPAT_EOL
};

static int
fwcfg_acpi_match(device_t parent, cfdata_t match, void *opaque)
{
       struct acpi_attach_args *aa = opaque;

       return acpi_compatible_match(aa, compat_data);
}

static void
fwcfg_acpi_attach(device_t parent, device_t self, void *opaque)
{
       struct fwcfg_softc *sc = device_private(self);
       struct acpi_attach_args *aa = opaque;
       struct acpi_resources res;
       struct acpi_mem *mem;
       struct acpi_io *io;
       bus_addr_t base;
       bus_size_t size;
       ACPI_STATUS rv;

       rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
           &res, &acpi_resource_parse_ops_default);
       if (ACPI_FAILURE(rv))
               return;

       sc->sc_dev = self;

       if ((io = acpi_res_io(&res, 0)) != NULL) {
               sc->sc_bst = aa->aa_iot;
               base = io->ar_base;
               size = io->ar_length;
       } else if ((mem = acpi_res_mem(&res, 0)) != NULL) {
               sc->sc_bst = aa->aa_memt;
               base = mem->ar_base;
               size = mem->ar_length;
       } else {
               aprint_error_dev(self, "couldn't acquire resources\n");
               return;
       }
       acpi_resource_cleanup(&res);

       if (bus_space_map(sc->sc_bst, base, size, 0, &sc->sc_bsh) != 0) {
               aprint_error_dev(self, "couldn't map registers\n");
               return;
       }

       fwcfg_attach(sc);

       pmf_device_register(self, NULL, NULL);
}