/* $NetBSD: ipmi_acpi.c,v 1.6 2021/08/07 16:19:09 thorpej Exp $ */

/*-
 * Copyright (c) 2018 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Michael van Elst
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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: ipmi_acpi.c,v 1.6 2021/08/07 16:19:09 thorpej Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/systm.h>

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

#include <dev/ipmivar.h>

#define _COMPONENT              ACPI_RESOURCE_COMPONENT
ACPI_MODULE_NAME                ("ipmi_acpi")

typedef struct ipmi_acpi_softc {
        device_t                sc_dev;
        bool                    sc_init;
} ipmi_acpi_softc_t;

static int      ipmi_acpi_match(device_t, cfdata_t, void *);
static void     ipmi_acpi_attach(device_t, device_t, void *);
static int      ipmi_acpi_detach(device_t, int);

CFATTACH_DECL3_NEW(ipmi_acpi, sizeof(ipmi_acpi_softc_t),
    ipmi_acpi_match, ipmi_acpi_attach, ipmi_acpi_detach, NULL, NULL, NULL,
    DVF_DETACH_SHUTDOWN);

static const struct device_compatible_entry compat_data[] = {
        { .compat = "IPI0001" },
        DEVICE_COMPAT_EOL
};

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

        return acpi_compatible_match(aa, compat_data);
}

static void
ipmi_acpi_attach(device_t parent, device_t self, void *opaque)
{
        ipmi_acpi_softc_t *sc = device_private(self);
        struct acpi_attach_args *aa = (struct acpi_attach_args *)opaque;
        ACPI_STATUS rv;
        ACPI_INTEGER itype, ivers, adr;
        struct acpi_resources res;
        struct acpi_io *io;
        struct acpi_mem *mem;
#if notyet
        struct acpi_irq *irq;
#endif
        struct ipmi_attach_args IA, *ia = &IA;
        bus_addr_t reg2;
        uint16_t i2caddr;

        sc->sc_dev = self;

        aprint_naive("\n");

        rv = acpi_eval_integer(aa->aa_node->ad_handle, "_IFT", &itype);
        if (ACPI_FAILURE(rv)) {
                aprint_error("no _IFT\n");
                return;
        }

        rv = acpi_eval_integer(aa->aa_node->ad_handle, "_SRV", &ivers);
        if (ACPI_FAILURE(rv)) {
                aprint_error("no _SRV\n");
                return;
        }

        switch (itype) {
        case IPMI_IF_KCS:
        case IPMI_IF_SMIC:
        case IPMI_IF_BT:
                rv = acpi_resource_parse(self, aa->aa_node->ad_handle, "_CRS",
                        &res, &acpi_resource_parse_ops_default);
                if (ACPI_FAILURE(rv)) {
                        aprint_normal("\n");
                        aprint_error_dev(self, "no resources\n");
                        return;
                }

                io = acpi_res_io(&res, 0);
                mem = acpi_res_mem(&res, 0);
                if (io == NULL && mem == NULL) {
                        aprint_error_dev(self, "no resources\n");
                        return;
                }

#if notyet
                if ((irq = acpi_res_irq(&res, 0)) != NULL) {
                        aprint_normal_dev(self, "IRQ %d type %d\n",
                                irq->ar_irq, irq->ar_type);
                } else {
                        aprint_error_dev(self, "no interrupt\n");
                }
#endif
                ia->iaa_iot = aa->aa_iot;
                ia->iaa_memt = aa->aa_memt;

                ia->iaa_if_type = itype;
                ia->iaa_if_rev = ivers;
                ia->iaa_if_iotype = io ? 'i' : 'm';
                ia->iaa_if_iobase = io ? io->ar_base : mem->ar_base;
                ia->iaa_if_iospacing = 1;
                ia->iaa_if_irq = -1;
                ia->iaa_if_irqlvl = 0;

                reg2 = 0;
                if (io) {
                        io = acpi_res_io(&res, 1);
                        if (io != NULL)
                                reg2 = (bus_addr_t)io->ar_base;
                } else {
                        mem = acpi_res_mem(&res, 1);
                        if (mem != NULL)
                                reg2 = mem->ar_base;
                }

                if (reg2 > ia->iaa_if_iobase)
                        ia->iaa_if_iospacing = reg2 - ia->iaa_if_iobase;

                config_found(self, ia, NULL, CFARGS_NONE);

                break;
        case IPMI_IF_SSIF:
                rv = acpi_eval_integer(aa->aa_node->ad_handle, "_ADR", &adr);
                if (ACPI_FAILURE(rv)) {
                        aprint_normal("\n");
                        aprint_error_dev(self, "no resources\n");
                        return;
                }
                if (adr > 65535) {
                        aprint_normal("\n");
                        aprint_error_dev(self, "i2c address out of range\n");
                        return;
                }
                i2caddr = adr;

                aprint_normal(": i2c 0x%x\n", i2caddr);
                break;
        default:
                aprint_normal("\n");
                aprint_error_dev(self, "unknown interface type\n");
                return;
        }

        sc->sc_init = true;

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "couldn't establish power handler\n");
}

static int
ipmi_acpi_detach(device_t self, int flags)
{
        struct ipmi_acpi_softc *sc = device_private(self);
        int rc;

        if (!sc->sc_init)
                return 0;

        rc = config_detach_children(self, flags);
        if (rc)
                return rc;

        pmf_device_deregister(self);
        return 0;
}