xref: /src/sys/arch/arm/acpi/plcom_acpi.c

/* $NetBSD: plcom_acpi.c,v 1.4 2023/01/24 06:56:40 mlelstv Exp $ */

/*-
 * Copyright (c) 2018 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jared McNeill <jmcneill (at) invisible.ca>.
 *
 * 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: plcom_acpi.c,v 1.4 2023/01/24 06:56:40 mlelstv Exp $");

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

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

#include <evbarm/dev/plcomreg.h>
#include <evbarm/dev/plcomvar.h>

static int	plcom_acpi_match(device_t, cfdata_t, void *);
static void	plcom_acpi_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(plcom_acpi, sizeof(struct plcom_softc), plcom_acpi_match, plcom_acpi_attach, NULL, NULL);

enum plcom_acpi_variant {
	PLCOM_ACPI_GENERIC,
	PLCOM_ACPI_PL011,
	PLCOM_ACPI_BCM2837
};

static const struct device_compatible_entry compat_data[] = {
	{ .compat = "BCM2837",		.value = PLCOM_ACPI_BCM2837 },
	{ .compat = "ARMH0011",		.value = PLCOM_ACPI_PL011 },
	{ .compat = "ARMHB000",		.value = PLCOM_ACPI_GENERIC },
	DEVICE_COMPAT_EOL
};

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

	if (aa->aa_node->ad_type != ACPI_TYPE_DEVICE)
		return 0;

	return acpi_compatible_match(aa, compat_data);
}

static void
plcom_acpi_attach(device_t parent, device_t self, void *aux)
{
	struct plcom_softc * const sc = device_private(self);
	struct acpi_attach_args *aa = aux;
	struct acpi_resources res;
	struct acpi_mem *mem;
	struct acpi_irq *irq;
	ACPI_STATUS rv;
	void *ih;

	sc->sc_dev = self;

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

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

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

	sc->sc_hwflags = 0;
	sc->sc_swflags = 0;
	sc->sc_fifolen = 0;
	sc->sc_pi.pi_type = PLCOM_TYPE_PL011;
	sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS;

	switch (acpi_compatible_lookup(aa, compat_data)->value) {
	case PLCOM_ACPI_BCM2837:
		sc->sc_fifolen = 16;
		break;
	case PLCOM_ACPI_GENERIC:
		sc->sc_pi.pi_type = PLCOM_TYPE_GENERIC_UART;
		break;
	}

	sc->sc_pi.pi_iot = aa->aa_memt;
	sc->sc_pi.pi_iobase = mem->ar_base;
	if (bus_space_map(aa->aa_memt, mem->ar_base, mem->ar_length, 0, &sc->sc_pi.pi_ioh) != 0) {
		aprint_error(": couldn't map registers\n");
		goto done;
	}

	plcom_attach_subr(sc);

	ih = acpi_intr_establish(self, (uint64_t)aa->aa_node->ad_handle,
	    IPL_SERIAL, true, plcomintr, sc, device_xname(self));
	if (ih == NULL) {
		aprint_error_dev(self, "couldn't install interrupt handler\n");
		return;
	}

done:
	acpi_resource_cleanup(&res);
}