Add ofw interface support to PCI

Some arm64 SoCs have nodes in their fdts that describe devices
connected to the internal PCI bus. One such SoC is Freescale LS1028A.
In order to access information stored in them we need to add ofw bus
support to pci. Pass devinfo request up to our parent, which
is responsible for parsing all the information.
It allows to use ofw interface on PCI devices that support it.
This method is similar to sys/dev/acpica/acpi_pci.c.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: andrew
Obtained from: Semihalf
Sponsored by: Alstom Group
Differential Revision: https://reviews.freebsd.org/D30181

2 files changed, 94 insertions, 0 deletions

diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
index fed33562b834..7b9b2583aaa1 100644
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -245,6 +245,7 @@ dev/neta/if_mvneta_fdt.c			optional neta fdt
 dev/neta/if_mvneta.c				optional neta mdio mii
 
 dev/ofw/ofw_cpu.c				optional fdt
+dev/ofw/ofw_pci.c				optional fdt pci
 dev/ofw/ofw_pcib.c				optional fdt pci
 
 dev/pci/controller/pci_n1sdp.c			optional pci_n1sdp acpi
diff --git a/sys/dev/ofw/ofw_pci.c b/sys/dev/ofw/ofw_pci.c
new file mode 100644
index 000000000000..c7ed7c5c8fe9
--- /dev/null
+++ b/sys/dev/ofw/ofw_pci.c
@@ -0,0 +1,93 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Alstom Group.
+ * Copyright (c) 2021 Semihalf.
+ *
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pci_private.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "pcib_if.h"
+#include "pci_if.h"
+
+static int	ofw_pci_probe(device_t);
+static const struct ofw_bus_devinfo* pci_ofw_get_devinfo(device_t, device_t);
+
+static device_method_t ofw_pci_methods[] = {
+	DEVMETHOD(device_probe,		ofw_pci_probe),
+
+	/* ofw_bus interface */
+	DEVMETHOD(ofw_bus_get_devinfo,	pci_ofw_get_devinfo),
+	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
+	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
+	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
+	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
+	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
+
+	DEVMETHOD_END
+};
+
+static devclass_t pci_devclass;
+
+DEFINE_CLASS_1(pci, ofw_pci_driver, ofw_pci_methods, sizeof(struct pci_softc),
+    pci_driver);
+DRIVER_MODULE(ofw_pci, pcib, ofw_pci_driver, pci_devclass, 0, 0);
+MODULE_DEPEND(ofw_pci, simplebus, 1, 1, 1);
+MODULE_DEPEND(ofw_pci, pci, 1, 1, 1);
+MODULE_VERSION(ofw_pci, 1);
+
+static int
+ofw_pci_probe(device_t dev)
+{
+	device_t parent;
+
+	parent = device_get_parent(dev);
+	if (ofw_bus_get_node(parent) <= 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "OFW PCI bus");
+	return (BUS_PROBE_DEFAULT);
+}
+
+/* Pass the request up to our parent. */
+static const struct ofw_bus_devinfo*
+pci_ofw_get_devinfo(device_t bus, device_t dev)
+{
+
+	return OFW_BUS_GET_DEVINFO(device_get_parent(bus), dev);
+}