/* $NetBSD: eqos_acpi.c,v 1.2 2023/12/24 16:12:54 skrll Exp $ */

/*-
 * Copyright (c) 2022 Jared McNeill <jmcneill@invisible.ca>
 * 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: eqos_acpi.c,v 1.2 2023/12/24 16:12:54 skrll Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/kmem.h>

#include <sys/rndsource.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_media.h>

#include <dev/mii/miivar.h>

#include <dev/ic/dwc_eqos_var.h>

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

#define CSR_RATE_RGMII          125000000

static const struct device_compatible_entry compat_data[] = {
        { .compat = "snps,dwmac-4.20a" },       /* DT link */
        DEVICE_COMPAT_EOL
};

static int      eqos_acpi_match(device_t, cfdata_t, void *);
static void     eqos_acpi_attach(device_t, device_t, void *);

static void     eqos_acpi_init_props(struct eqos_softc *, ACPI_HANDLE);

CFATTACH_DECL_NEW(eqos_acpi, sizeof(struct eqos_softc),
    eqos_acpi_match, eqos_acpi_attach, NULL, NULL);

static int
eqos_acpi_match(device_t parent, cfdata_t cf, void *aux)
{
        struct acpi_attach_args *aa = aux;

        return acpi_compatible_match(aa, compat_data);
}

static void
eqos_acpi_attach(device_t parent, device_t self, void *aux)
{
        struct eqos_softc * const sc = device_private(self);
        struct acpi_attach_args *aa = aux;
        ACPI_HANDLE handle = aa->aa_node->ad_handle;
        struct acpi_resources res;
        struct acpi_mem *mem;
        struct acpi_irq *irq;
        ACPI_STATUS rv;
        int error;
        void *ih;

        sc->sc_dev = self;

        rv = acpi_resource_parse(sc->sc_dev, handle, "_CRS",
            &res, &acpi_resource_parse_ops_default);
        if (ACPI_FAILURE(rv))
                return;

        mem = acpi_res_mem(&res, 0);
        if (mem == NULL) {
                aprint_error_dev(self, "couldn't find mem resource\n");
                goto done;
        }

        irq = acpi_res_irq(&res, 0);
        if (irq == NULL) {
                aprint_error_dev(self, "couldn't find irq resource\n");
                goto done;
        }

        sc->sc_bst = aa->aa_memt;
        error = bus_space_map(sc->sc_bst, mem->ar_base, mem->ar_length,
            0, &sc->sc_bsh);
        if (error != 0) {
                aprint_error_dev(self, "couldn't map registers\n");
                goto done;
        }
        sc->sc_dmat = BUS_DMA_TAG_VALID(aa->aa_dmat64) ?
            aa->aa_dmat64 : aa->aa_dmat;
        sc->sc_phy_id = MII_PHY_ANY;
        sc->sc_csr_clock = CSR_RATE_RGMII;

        eqos_acpi_init_props(sc, handle);

        aprint_normal("%s", device_xname(self));
        if (eqos_attach(sc) != 0)
                goto done;

        ih = acpi_intr_establish(self, (uint64_t)(uintptr_t)handle, IPL_NET,
            true, eqos_intr, sc, device_xname(self));
        if (ih == NULL) {
                aprint_error_dev(self, "couldn't establish interrupt\n");
                goto done;
        }

done:
        acpi_resource_cleanup(&res);
}

static void
eqos_acpi_init_props(struct eqos_softc *sc, ACPI_HANDLE handle)
{
        prop_dictionary_t prop = device_properties(sc->sc_dev);
        ACPI_STATUS rv;
        ACPI_INTEGER ival;
#if notyet
        ACPI_HANDLE axi;
        char *sval;
#endif

        /* Defaults */
        prop_dictionary_set_uint(prop, "snps,wr_osr_lmt", 4);
        prop_dictionary_set_uint(prop, "snps,rd_osr_lmt", 8);

        /* Get settings from DSD properties */
        rv = acpi_dsd_integer(handle, "snps,mixed-burst", &ival);
        if (ACPI_SUCCESS(rv) && ival) {
                prop_dictionary_set_bool(prop, "snps,mixed-burst", true);
        }
        rv = acpi_dsd_integer(handle, "snps,tso", &ival);
        if (ACPI_SUCCESS(rv) && ival) {
                prop_dictionary_set_bool(prop, "snps,tso", true);
        }

#if notyet
        rv = acpi_dsd_string(handle, "snps,axi-config", &sval);
        if (ACPI_SUCCESS(rv)) {
                rv = AcpiGetHandle(handle, sval, &axi);
                if (ACPI_SUCCESS(rv)) {
                        rv = acpi_dsd_integer(axi, "snps,wr_osr_lmt", &ival);
                        if (ACPI_SUCCESS(rv) && ival > 0) {
                                prop_dictionary_set_uint(prop,
                                    "snps,wr_osr_lmt", ival);
                        }
                        rv = acpi_dsd_integer(axi, "snps,rd_osr_lmt", &ival);
                        if (ACPI_SUCCESS(rv) && ival > 0) {
                                prop_dictionary_set_uint(prop,
                                    "snps,rd_osr_lmt", ival);
                        }
                }
                kmem_strfree(sval);
        }
#endif
}