Support multi-port PCIe hierarchy in Marvell boards DTS

This commit is another part of preparation for PCIe multi-port
support for Marvell SoCs. Some device trees include pcie-controller
node as a bus-parent of pcie nodes. This patch adds support for
new bus, collects and configures device informations and finally
adds PCIB devices as a childs of pcie-controller in Newbus hierarchy.

Submitted by:	Marcin Mazurek <mma@semihalf.com>
Obtained form:	Semihalf
Sponsored by:	Stormshield
Reviewed by:    https://reviews.freebsd.org/D10906

(cherry picked from commit 5dfa5d72e7cddc0a3078209cfcea38d9c436a9da)

3 files changed, 367 insertions, 8 deletions

diff --git a/sys/arm/mv/files.mv b/sys/arm/mv/files.mv
index 12e9e43..4d70d29 100644
--- a/sys/arm/mv/files.mv
+++ b/sys/arm/mv/files.mv
@@ -16,6 +16,7 @@ arm/mv/gpio.c			optional	gpio
 arm/mv/mv_common.c		standard
 arm/mv/mv_localbus.c		standard
 arm/mv/mv_machdep.c		standard
+arm/mv/mv_pci_ctrl.c		optional	pci | fdt
 arm/mv/mv_pci.c			optional	pci
 arm/mv/mv_ts.c			standard
 arm/mv/timer.c			optional	!soc_mv_armada38x
diff --git a/sys/arm/mv/mv_pci.c b/sys/arm/mv/mv_pci.c
index 6332ea0..0fb528a 100644
--- a/sys/arm/mv/mv_pci.c
+++ b/sys/arm/mv/mv_pci.c
@@ -394,6 +394,7 @@ static driver_t mv_pcib_driver = {
 devclass_t pcib_devclass;
 
 DRIVER_MODULE(pcib, ofwbus, mv_pcib_driver, pcib_devclass, 0, 0);
+DRIVER_MODULE(pcib, pcib_ctrl, mv_pcib_driver, pcib_devclass, 0, 0);
 
 static struct mtx pcicfg_mtx;
 
@@ -419,21 +420,29 @@ mv_pcib_attach(device_t self)
 {
 	struct mv_pcib_softc *sc;
 	phandle_t node, parnode;
-	uint32_t val, unit;
-	int err;
+	uint32_t val, reg0;
+	int err, bus, devfn, port_id;
 
 	sc = device_get_softc(self);
 	sc->sc_dev = self;
-	unit = fdt_get_unit(self);
-
 
 	node = ofw_bus_get_node(self);
 	parnode = OF_parent(node);
+
+	if (OF_getencprop(node, "marvell,pcie-port", &(port_id),
+	    sizeof(port_id)) <= 0) {
+		/* If port ID does not exist in the FDT set value to 0 */
+		if (!OF_hasprop(node, "marvell,pcie-port"))
+			port_id = 0;
+		else
+			return(ENXIO);
+	}
+
 	if (ofw_bus_node_is_compatible(node, "mrvl,pcie")) {
 		sc->sc_type = MV_TYPE_PCIE;
-		sc->sc_win_target = MV_WIN_PCIE_TARGET(unit);
-		sc->sc_mem_win_attr = MV_WIN_PCIE_MEM_ATTR(unit);
-		sc->sc_io_win_attr = MV_WIN_PCIE_IO_ATTR(unit);
+		sc->sc_win_target = MV_WIN_PCIE_TARGET(port_id);
+		sc->sc_mem_win_attr = MV_WIN_PCIE_MEM_ATTR(port_id);
+		sc->sc_io_win_attr = MV_WIN_PCIE_IO_ATTR(port_id);
 	} else if (ofw_bus_node_is_compatible(node, "mrvl,pci")) {
 		sc->sc_type = MV_TYPE_PCI;
 		sc->sc_win_target = MV_WIN_PCI_TARGET;
@@ -476,7 +485,7 @@ mv_pcib_attach(device_t self)
 	/*
 	 * Enable PCIE device.
 	 */
-	mv_pcib_enable(sc, unit);
+	mv_pcib_enable(sc, port_id);
 
 	/*
 	 * Memory management.
@@ -485,6 +494,22 @@ mv_pcib_attach(device_t self)
 	if (err)
 		return (err);
 
+	/*
+	 * Preliminary bus enumeration to find first linked devices and set
+	 * appropriate bus number from which should start the actual enumeration
+	 */
+	for (bus = 0; bus < PCI_BUSMAX; bus++) {
+		for (devfn = 0; devfn < mv_pcib_maxslots(self); devfn++) {
+			reg0 = mv_pcib_read_config(self, bus, devfn, devfn & 0x7, 0x0, 4);
+			if (reg0 == (~0U))
+				continue; /* no device */
+			else {
+				sc->sc_busnr = bus; /* update bus number */
+				break;
+			}
+		}
+	}
+
 	if (sc->sc_mode == MV_MODE_ROOT) {
 		err = mv_pcib_init(sc, sc->sc_busnr,
 		    mv_pcib_maxslots(sc->sc_dev));
diff --git a/sys/arm/mv/mv_pci_ctrl.c b/sys/arm/mv/mv_pci_ctrl.c
new file mode 100644
index 0000000..c3d0def
--- /dev/null
+++ b/sys/arm/mv/mv_pci_ctrl.c
@@ -0,0 +1,333 @@
+/*-
+ * Copyright (c) 2016 Stormshield
+ * Copyright (c) 2016 Semihalf
+ * All rights reserved.
+ *
+ * Developed by Semihalf.
+ *
+ * Portions of this software were developed by Semihalf
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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.
+ * 3. Neither the name of MARVELL nor the names of contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
+ */
+
+/*
+ * Marvell integrated PCI/PCI-Express Bus Controller Driver.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+static int mv_pcib_ctrl_probe(device_t);
+static int mv_pcib_ctrl_attach(device_t);
+static device_t mv_pcib_ctrl_add_child(device_t, u_int, const char *, int);
+static const struct ofw_bus_devinfo * mv_pcib_ctrl_get_devinfo(device_t, device_t);
+static struct resource * mv_pcib_ctrl_alloc_resource(device_t, device_t, int,
+    int *, rman_res_t, rman_res_t, rman_res_t, u_int);
+void mv_pcib_ctrl_init(device_t, phandle_t);
+static int mv_pcib_ofw_bus_attach(device_t);
+
+struct mv_pcib_ctrl_range {
+	uint64_t bus;
+	uint64_t host;
+	uint64_t size;
+};
+
+struct mv_pcib_ctrl_softc {
+	pcell_t				addr_cells;
+	pcell_t				size_cells;
+	int				nranges;
+	struct mv_pcib_ctrl_range	*ranges;
+};
+
+struct mv_pcib_ctrl_devinfo {
+	struct ofw_bus_devinfo	di_dinfo;
+	struct resource_list	di_rl;
+};
+
+static int mv_pcib_ctrl_fill_ranges(phandle_t, struct mv_pcib_ctrl_softc *);
+
+/*
+ * Bus interface definitions
+ */
+static device_method_t mv_pcib_ctrl_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,			mv_pcib_ctrl_probe),
+	DEVMETHOD(device_attach,		mv_pcib_ctrl_attach),
+
+	/* Bus interface */
+	DEVMETHOD(bus_add_child,		mv_pcib_ctrl_add_child),
+	DEVMETHOD(bus_alloc_resource,		mv_pcib_ctrl_alloc_resource),
+	DEVMETHOD(bus_release_resource,		bus_generic_release_resource),
+	DEVMETHOD(bus_activate_resource,	bus_generic_activate_resource),
+	DEVMETHOD(bus_setup_intr,		bus_generic_setup_intr),
+
+	/* ofw_bus interface */
+	DEVMETHOD(ofw_bus_get_devinfo,		mv_pcib_ctrl_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 driver_t mv_pcib_ctrl_driver = {
+	"pcib_ctrl",
+	mv_pcib_ctrl_methods,
+	sizeof(struct mv_pcib_ctrl_softc),
+};
+
+devclass_t pcib_ctrl_devclass;
+
+DRIVER_MODULE(pcib_ctrl, simplebus, mv_pcib_ctrl_driver, pcib_ctrl_devclass, 0, 0);
+
+MALLOC_DEFINE(M_PCIB_CTRL, "PCIe Bus Controller",
+    "Marvell Integrated PCIe Bus Controller");
+
+static int
+mv_pcib_ctrl_probe(device_t dev)
+{
+
+	if (!ofw_bus_is_compatible(dev, "mrvl,pcie-ctrl") &&
+	    !ofw_bus_is_compatible(dev, "marvell,armada-370-pcie"))
+		return (ENXIO);
+
+	device_set_desc(dev, "Marvell Integrated PCIe Bus Controller");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+mv_pcib_ctrl_attach(device_t dev)
+{
+	int err;
+
+	err = mv_pcib_ofw_bus_attach(dev);
+	if (err != 0)
+		return (err);
+
+	return (bus_generic_attach(dev));
+}
+
+static int
+mv_pcib_ofw_bus_attach(device_t dev)
+{
+	struct mv_pcib_ctrl_devinfo *di;
+	struct mv_pcib_ctrl_softc *sc;
+	device_t child;
+	phandle_t parent, node;
+
+	parent = ofw_bus_get_node(dev);
+	sc = device_get_softc(dev);
+	if (parent > 0) {
+		sc->addr_cells = 1;
+		if (OF_getencprop(parent, "#address-cells", &(sc->addr_cells),
+		    sizeof(sc->addr_cells)) <= 0)
+			return(ENXIO);
+
+		sc->size_cells = 1;
+		if (OF_getencprop(parent, "#size-cells", &(sc->size_cells),
+		    sizeof(sc->size_cells)) <= 0)
+			return(ENXIO);
+
+		for (node = OF_child(parent); node > 0; node = OF_peer(node)) {
+			di = malloc(sizeof(*di), M_PCIB_CTRL, M_WAITOK | M_ZERO);
+			if (ofw_bus_gen_setup_devinfo(&di->di_dinfo, node)) {
+				if (bootverbose) {
+					device_printf(dev,
+					    "Could not set up devinfo for PCI\n");
+				}
+				free(di, M_PCIB_CTRL);
+				continue;
+			}
+
+			child = device_add_child(dev, NULL, -1);
+			if (child == NULL) {
+				if (bootverbose) {
+					device_printf(dev,
+					    "Could not add child: %s\n",
+					    di->di_dinfo.obd_name);
+				}
+				ofw_bus_gen_destroy_devinfo(&di->di_dinfo);
+				free(di, M_PCIB_CTRL);
+				continue;
+			}
+
+			resource_list_init(&di->di_rl);
+			ofw_bus_reg_to_rl(child, node, sc->addr_cells,
+			    sc->size_cells, &di->di_rl);
+
+			device_set_ivars(child, di);
+		}
+	}
+
+	if (mv_pcib_ctrl_fill_ranges(parent, sc) < 0) {
+		device_printf(dev, "could not get ranges\n");
+		return (ENXIO);
+	}
+
+	return (0);
+}
+
+static device_t
+mv_pcib_ctrl_add_child(device_t dev, u_int order, const char *name, int unit)
+{
+	device_t cdev;
+	struct mv_pcib_ctrl_devinfo *di;
+
+	cdev = device_add_child_ordered(dev, order, name, unit);
+	if (cdev == NULL)
+		return (NULL);
+
+	di = malloc(sizeof(*di), M_DEVBUF, M_WAITOK | M_ZERO);
+	di->di_dinfo.obd_node = -1;
+	resource_list_init(&di->di_rl);
+	device_set_ivars(cdev, di);
+
+	return (cdev);
+}
+
+static struct resource *
+mv_pcib_ctrl_alloc_resource(device_t bus, device_t child, int type, int *rid,
+    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
+{
+	struct mv_pcib_ctrl_devinfo *di;
+	struct resource_list_entry *rle;
+	struct mv_pcib_ctrl_softc *sc;
+	int i;
+
+	if (RMAN_IS_DEFAULT_RANGE(start, end)) {
+
+		if ((di = device_get_ivars(child)) == NULL)
+			return (NULL);
+		if (type != SYS_RES_MEMORY)
+			return (NULL);
+
+		/* Find defaults for this rid */
+		rle = resource_list_find(&di->di_rl, type, *rid);
+
+		if (rle == NULL)
+			return (NULL);
+
+		start = rle->start;
+		end = rle->end;
+		count = rle->count;
+	}
+
+	sc = device_get_softc(bus);
+	if (type == SYS_RES_MEMORY) {
+		/* Remap through ranges property */
+		for (i = 0; i < sc->nranges; i++) {
+			if (start >= sc->ranges[i].bus && end <
+			    sc->ranges[i].bus + sc->ranges[i].size) {
+				start -= sc->ranges[i].bus;
+				start += sc->ranges[i].host;
+				end -= sc->ranges[i].bus;
+				end += sc->ranges[i].host;
+				break;
+			}
+		}
+
+		if (i == sc->nranges && sc->nranges != 0) {
+			device_printf(bus, "Could not map resource "
+			    "%#llx-%#llx\n", start, end);
+			return (NULL);
+		}
+	}
+
+	return (bus_generic_alloc_resource(bus, child, type, rid, start, end,
+	    count, flags));
+}
+
+static int
+mv_pcib_ctrl_fill_ranges(phandle_t node, struct mv_pcib_ctrl_softc *sc)
+{
+	int host_address_cells;
+	cell_t *base_ranges;
+	ssize_t nbase_ranges;
+	int err;
+	int i, j, k;
+
+	err = OF_searchencprop(OF_parent(node), "#address-cells",
+	    &host_address_cells, sizeof(host_address_cells));
+	if (err <= 0)
+		return (-1);
+
+	nbase_ranges = OF_getproplen(node, "ranges");
+	if (nbase_ranges < 0)
+		return (-1);
+	sc->nranges = nbase_ranges / sizeof(cell_t) /
+	    (sc->addr_cells + host_address_cells + sc->size_cells);
+	if (sc->nranges == 0)
+		return (0);
+
+	sc->ranges = malloc(sc->nranges * sizeof(sc->ranges[0]),
+	    M_DEVBUF, M_WAITOK);
+	base_ranges = malloc(nbase_ranges, M_DEVBUF, M_WAITOK);
+	OF_getencprop(node, "ranges", base_ranges, nbase_ranges);
+
+	for (i = 0, j = 0; i < sc->nranges; i++) {
+		sc->ranges[i].bus = 0;
+		for (k = 0; k < sc->addr_cells; k++) {
+			sc->ranges[i].bus <<= 32;
+			sc->ranges[i].bus |= base_ranges[j++];
+		}
+		sc->ranges[i].host = 0;
+		for (k = 0; k < host_address_cells; k++) {
+			sc->ranges[i].host <<= 32;
+			sc->ranges[i].host |= base_ranges[j++];
+		}
+		sc->ranges[i].size = 0;
+		for (k = 0; k < sc->size_cells; k++) {
+			sc->ranges[i].size <<= 32;
+			sc->ranges[i].size |= base_ranges[j++];
+		}
+	}
+
+	free(base_ranges, M_DEVBUF);
+	return (sc->nranges);
+}
+
+static const struct ofw_bus_devinfo *
+mv_pcib_ctrl_get_devinfo(device_t bus __unused, device_t child)
+{
+	struct mv_pcib_ctrl_devinfo *di;
+
+	di = device_get_ivars(child);
+	return (&di->di_dinfo);
+}