1 files changed, 471 insertions, 0 deletions
diff --git a/sys/arm/arm/nexus.c b/sys/arm/arm/nexus.c
new file mode 100644
index 000000000000..368a653ea4f9
--- /dev/null
+++ b/sys/arm/arm/nexus.c
@@ -0,0 +1,471 @@
+/*-
+ * Copyright 1998 Massachusetts Institute of Technology
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that both the above copyright notice and this
+ * permission notice appear in all copies, that both the above
+ * copyright notice and this permission notice appear in all
+ * supporting documentation, and that the name of M.I.T. not be used
+ * in advertising or publicity pertaining to distribution of the
+ * software without specific, written prior permission.  M.I.T. makes
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
+ * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
+ * SHALL M.I.T. 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.
+ *
+ */
+
+/*
+ * This code implements a `root nexus' for Arm Architecture
+ * machines.  The function of the root nexus is to serve as an
+ * attachment point for both processors and buses, and to manage
+ * resources which are common to all of them.  In particular,
+ * this code implements the core resource managers for interrupt
+ * requests, DMA requests (which rightfully should be a part of the
+ * ISA code but it's easier to do it here for now), I/O port addresses,
+ * and I/O memory address space.
+ */
+
+#include "opt_platform.h"
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <machine/bus.h>
+#include <sys/rman.h>
+#include <sys/interrupt.h>
+
+#include <machine/vmparam.h>
+#include <machine/pcb.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/resource.h>
+#include <machine/intr.h>
+
+#include <arm/arm/nexusvar.h>
+
+#ifdef FDT
+#include <machine/fdt.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include "ofw_bus_if.h"
+#endif
+
+static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
+
+struct nexus_device {
+	struct resource_list	nx_resources;
+};
+
+#define DEVTONX(dev)	((struct nexus_device *)device_get_ivars(dev))
+
+static struct rman mem_rman;
+
+static	int nexus_probe(device_t);
+static	int nexus_attach(device_t);
+static	int nexus_print_child(device_t, device_t);
+static	device_t nexus_add_child(device_t, u_int, const char *, int);
+static	struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
+    rman_res_t, rman_res_t, rman_res_t, u_int);
+static	int nexus_activate_resource(device_t, device_t, int, int,
+    struct resource *);
+static bus_space_tag_t nexus_get_bus_tag(device_t, device_t);
+static bus_dma_tag_t nexus_get_dma_tag(device_t dev, device_t child);
+#ifdef INTRNG
+#ifdef SMP
+static	int nexus_bind_intr(device_t, device_t, struct resource *, int);
+#endif
+#endif
+static int nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
+    enum intr_polarity pol);
+#ifdef INTRNG
+static	int nexus_describe_intr(device_t dev, device_t child,
+    struct resource *irq, void *cookie, const char *descr);
+#endif
+static	int nexus_deactivate_resource(device_t, device_t, int, int,
+    struct resource *);
+static int nexus_release_resource(device_t, device_t, int, int,
+    struct resource *);
+
+static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
+    int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
+static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
+
+#ifdef FDT
+static int nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent,
+    int icells, pcell_t *intr);
+#endif
+
+/*
+ * Normally NULL (which results in defaults which are handled in
+ * busdma_machdep), platform init code can use nexus_set_dma_tag() to set this
+ * to a tag that will be inherited by all busses and devices on the platform.
+ */
+static bus_dma_tag_t nexus_dma_tag;
+
+static device_method_t nexus_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		nexus_probe),
+	DEVMETHOD(device_attach,	nexus_attach),
+	/* Bus interface */
+	DEVMETHOD(bus_print_child,	nexus_print_child),
+	DEVMETHOD(bus_add_child,	nexus_add_child),
+	DEVMETHOD(bus_alloc_resource,	nexus_alloc_resource),
+	DEVMETHOD(bus_activate_resource,	nexus_activate_resource),
+	DEVMETHOD(bus_config_intr,	nexus_config_intr),
+	DEVMETHOD(bus_deactivate_resource,	nexus_deactivate_resource),
+	DEVMETHOD(bus_release_resource,	nexus_release_resource),
+	DEVMETHOD(bus_setup_intr,	nexus_setup_intr),
+	DEVMETHOD(bus_teardown_intr,	nexus_teardown_intr),
+	DEVMETHOD(bus_get_bus_tag,	nexus_get_bus_tag),
+	DEVMETHOD(bus_get_dma_tag,	nexus_get_dma_tag),
+#ifdef INTRNG
+	DEVMETHOD(bus_describe_intr,	nexus_describe_intr),
+#ifdef SMP
+	DEVMETHOD(bus_bind_intr,	nexus_bind_intr),
+#endif
+#endif
+#ifdef FDT
+	DEVMETHOD(ofw_bus_map_intr,	nexus_ofw_map_intr),
+#endif
+	{ 0, 0 }
+};
+
+static devclass_t nexus_devclass;
+static driver_t nexus_driver = {
+	"nexus",
+	nexus_methods,
+	1			/* no softc */
+};
+EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
+    BUS_PASS_BUS + BUS_PASS_ORDER_EARLY);
+
+static int
+nexus_probe(device_t dev)
+{
+
+	device_quiet(dev);	/* suppress attach message for neatness */
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+nexus_attach(device_t dev)
+{
+
+	mem_rman.rm_start = 0;
+	mem_rman.rm_end = BUS_SPACE_MAXADDR;
+	mem_rman.rm_type = RMAN_ARRAY;
+	mem_rman.rm_descr = "I/O memory addresses";
+	if (rman_init(&mem_rman) ||
+	    rman_manage_region(&mem_rman, 0, BUS_SPACE_MAXADDR))
+		panic("nexus_probe mem_rman");
+
+	/*
+	 * First, deal with the children we know about already
+	 */
+	bus_generic_probe(dev);
+	bus_generic_attach(dev);
+
+	return (0);
+}
+
+static int
+nexus_print_child(device_t bus, device_t child)
+{
+	int retval = 0;
+
+	retval += bus_print_child_header(bus, child);
+	retval += printf("\n");
+
+	return (retval);
+}
+
+static device_t
+nexus_add_child(device_t bus, u_int order, const char *name, int unit)
+{
+	device_t child;
+	struct nexus_device *ndev;
+
+	ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
+	if (!ndev)
+		return (0);
+	resource_list_init(&ndev->nx_resources);
+
+	child = device_add_child_ordered(bus, order, name, unit);
+
+	/* should we free this in nexus_child_detached? */
+	device_set_ivars(child, ndev);
+
+	return (child);
+}
+
+/*
+ * Allocate a resource on behalf of child.  NB: child is usually going to be a
+ * child of one of our descendants, not a direct child of nexus0.
+ * (Exceptions include footbridge.)
+ */
+static struct resource *
+nexus_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 resource *rv;
+	struct rman *rm;
+	int needactivate = flags & RF_ACTIVE;
+
+	flags &= ~RF_ACTIVE;
+
+	switch (type) {
+	case SYS_RES_MEMORY:
+	case SYS_RES_IOPORT:
+		rm = &mem_rman;
+		break;
+
+	default:
+		return (NULL);
+	}
+
+	rv = rman_reserve_resource(rm, start, end, count, flags, child);
+	if (rv == NULL)
+		return (NULL);
+
+	rman_set_rid(rv, *rid);
+
+	if (needactivate) {
+		if (bus_activate_resource(child, type, *rid, rv)) {
+			rman_release_resource(rv);
+			return (0);
+		}
+	}
+
+	return (rv);
+}
+
+static int
+nexus_release_resource(device_t bus, device_t child, int type, int rid,
+    struct resource *res)
+{
+	int error;
+
+	if (rman_get_flags(res) & RF_ACTIVE) {
+		error = bus_deactivate_resource(child, type, rid, res);
+		if (error)
+			return (error);
+	}
+	return (rman_release_resource(res));
+}
+
+static bus_space_tag_t
+nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
+{
+
+#ifdef FDT
+		return(fdtbus_bs_tag);
+#else
+		return((void *)1);
+#endif
+}
+
+static bus_dma_tag_t
+nexus_get_dma_tag(device_t dev, device_t child)
+{
+
+	return nexus_dma_tag;
+}
+
+void
+nexus_set_dma_tag(bus_dma_tag_t tag)
+{
+
+	nexus_dma_tag = tag;
+}
+
+static int
+nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
+    enum intr_polarity pol)
+{
+	int ret = ENODEV;
+
+#ifdef INTRNG
+	device_printf(dev, "bus_config_intr is obsolete and not supported!\n");
+	ret = EOPNOTSUPP;
+#else
+	if (arm_config_irq)
+		ret = (*arm_config_irq)(irq, trig, pol);
+#endif
+	return (ret);
+}
+
+static int
+nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
+    driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
+{
+#ifndef INTRNG
+	int irq;
+#endif
+
+	if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
+		flags |= INTR_EXCL;
+
+#ifdef INTRNG
+	return(intr_setup_irq(child, res, filt, intr, arg, flags, cookiep));
+#else
+	for (irq = rman_get_start(res); irq <= rman_get_end(res); irq++) {
+		arm_setup_irqhandler(device_get_nameunit(child),
+		    filt, intr, arg, irq, flags, cookiep);
+		arm_unmask_irq(irq);
+	}
+	return (0);
+#endif
+}
+
+static int
+nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
+{
+
+#ifdef INTRNG
+	return (intr_teardown_irq(child, r, ih));
+#else
+	return (arm_remove_irqhandler(rman_get_start(r), ih));
+#endif
+}
+
+#ifdef INTRNG
+static int
+nexus_describe_intr(device_t dev, device_t child, struct resource *irq,
+    void *cookie, const char *descr)
+{
+
+	return (intr_describe_irq(child, irq, cookie, descr));
+}
+
+#ifdef SMP
+static int
+nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu)
+{
+
+	return (intr_bind_irq(child, irq, cpu));
+}
+#endif
+#endif
+
+static int
+nexus_activate_resource(device_t bus, device_t child, int type, int rid,
+    struct resource *r)
+{
+	int err;
+	bus_addr_t paddr;
+	bus_size_t psize;
+	bus_space_handle_t vaddr;
+
+	if ((err = rman_activate_resource(r)) != 0)
+		return (err);
+
+	/*
+	 * If this is a memory resource, map it into the kernel.
+	 */
+	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
+		paddr = (bus_addr_t)rman_get_start(r);
+		psize = (bus_size_t)rman_get_size(r);
+#ifdef FDT
+		err = bus_space_map(fdtbus_bs_tag, paddr, psize, 0, &vaddr);
+		if (err != 0) {
+			rman_deactivate_resource(r);
+			return (err);
+		}
+		rman_set_bustag(r, fdtbus_bs_tag);
+#else
+		vaddr = (bus_space_handle_t)pmap_mapdev((vm_offset_t)paddr,
+		    (vm_size_t)psize);
+		if (vaddr == 0) {
+			rman_deactivate_resource(r);
+			return (ENOMEM);
+		}
+		rman_set_bustag(r, (void *)1);
+#endif
+		rman_set_virtual(r, (void *)vaddr);
+		rman_set_bushandle(r, vaddr);
+		return (0);
+	} else if (type == SYS_RES_IRQ) {
+#ifdef INTRNG
+		err = intr_activate_irq(child, r);
+		if (err != 0) {
+			rman_deactivate_resource(r);
+			return (err);
+		}
+#endif
+	}
+	return (0);
+}
+
+static int
+nexus_deactivate_resource(device_t bus, device_t child, int type, int rid,
+    struct resource *r)
+{
+	bus_size_t psize;
+	bus_space_handle_t vaddr;
+
+	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
+		psize = (bus_size_t)rman_get_size(r);
+		vaddr = rman_get_bushandle(r);
+
+		if (vaddr != 0) {
+#ifdef FDT
+			bus_space_unmap(fdtbus_bs_tag, vaddr, psize);
+#else
+			pmap_unmapdev((vm_offset_t)vaddr, (vm_size_t)psize);
+#endif
+			rman_set_virtual(r, NULL);
+			rman_set_bushandle(r, 0);
+		}
+	} else if (type == SYS_RES_IRQ) {
+#ifdef INTRNG
+		intr_deactivate_irq(child, r);
+#endif
+	}
+
+	return (rman_deactivate_resource(r));
+}
+
+#ifdef FDT
+static int
+nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
+    pcell_t *intr)
+{
+#ifndef INTRNG
+	return (intr_fdt_map_irq(iparent, intr, icells));
+#else
+	u_int irq;
+	struct intr_map_data_fdt *fdt_data;
+	size_t len;
+
+	len = sizeof(*fdt_data) + icells * sizeof(pcell_t);
+	fdt_data = (struct intr_map_data_fdt *)intr_alloc_map_data(
+	    INTR_MAP_DATA_FDT, len, M_WAITOK | M_ZERO);
+	fdt_data->iparent = iparent;
+	fdt_data->ncells = icells;
+	memcpy(fdt_data->cells, intr, icells * sizeof(pcell_t));
+	irq = intr_map_irq(NULL, iparent, (struct intr_map_data *)fdt_data);
+	return (irq);
+#endif /* INTRNG */
+}
+#endif /* FDT */