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

/* $NetBSD: acpipchb.c,v 1.2 2018/10/19 11:40:27 jmcneill 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: acpipchb.c,v 1.2 2018/10/19 11:40:27 jmcneill Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/intr.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/extent.h>
#include <sys/queue.h>
#include <sys/mutex.h>
#include <sys/kmem.h>

#include <machine/cpu.h>

#include <arm/cpufunc.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pciconf.h>

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

#include <arm/acpi/acpi_pci_machdep.h>

#define	PCIHOST_CACHELINE_SIZE		arm_dcache_align

struct acpipchb_softc {
	device_t		sc_dev;

	struct arm32_bus_dma_tag sc_dmat;
	struct acpi_pci_context sc_ap;

	ACPI_HANDLE		sc_handle;
	ACPI_INTEGER		sc_bus;
};

static struct arm32_dma_range ahcipchb_coherent_ranges[] = {
	[0] = {
		.dr_sysbase = 0,
		.dr_busbase = 0,
		.dr_len = UINTPTR_MAX,
		.dr_flags = _BUS_DMAMAP_COHERENT,
	}
};

static int	acpipchb_match(device_t, cfdata_t, void *);
static void	acpipchb_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(acpipchb, sizeof(struct acpipchb_softc),
	acpipchb_match, acpipchb_attach, NULL, NULL);

static const char * const compatible[] = {
	"PNP0A08",
	NULL
};

static int
acpipchb_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_match_hid(aa->aa_node->ad_devinfo, compatible);
}

static void
acpipchb_attach(device_t parent, device_t self, void *aux)
{
	struct acpipchb_softc * const sc = device_private(self);
	struct acpi_attach_args *aa = aux;
	struct pcibus_attach_args pba;
	ACPI_INTEGER cca, seg;

	sc->sc_dev = self;
	sc->sc_handle = aa->aa_node->ad_handle;

	if (ACPI_FAILURE(acpi_eval_integer(sc->sc_handle, "_BBN", &sc->sc_bus)))
		sc->sc_bus = 0;

	if (ACPI_FAILURE(acpi_eval_integer(sc->sc_handle, "_SEG", &seg)))
		seg = 0;

	if (ACPI_FAILURE(acpi_eval_integer(sc->sc_handle, "_CCA", &cca)))
		cca = 0;

	aprint_naive("\n");
	aprint_normal(": PCI Express Host Bridge\n");

	sc->sc_dmat = *aa->aa_dmat;
	if (cca) {
		sc->sc_dmat._ranges = ahcipchb_coherent_ranges;
		sc->sc_dmat._nranges = __arraycount(ahcipchb_coherent_ranges);
	}

	sc->sc_ap.ap_pc = *aa->aa_pc;
	sc->sc_ap.ap_pc.pc_conf_v = &sc->sc_ap;
	sc->sc_ap.ap_seg = seg;

	if (acpimcfg_configure_bus(self, &sc->sc_ap.ap_pc, sc->sc_handle, sc->sc_bus, PCIHOST_CACHELINE_SIZE) != 0) {
		aprint_error_dev(self, "failed to configure PCI bus\n");
		return;
	}

	memset(&pba, 0, sizeof(pba));
	pba.pba_flags = aa->aa_pciflags;
	pba.pba_iot = aa->aa_iot;
	pba.pba_memt = aa->aa_memt;
	pba.pba_dmat = &sc->sc_dmat;
#ifdef _PCI_HAVE_DMA64
	pba.pba_dmat64 = &sc->sc_dmat;
#endif
	pba.pba_pc = &sc->sc_ap.ap_pc;
	pba.pba_bus = sc->sc_bus;

	config_found_ia(self, "pcibus", &pba, pcibusprint);
}