Author: br
Date: Tue Jun 12 17:07:30 2018
New Revision: 335006
URL: https://svnweb.freebsd.org/changeset/base/335006
Log:
Add simplebus-like RISC-V SoC bus.
This is required in order to probe and attach devices described under
"riscv-virtio-soc" node of DTS.
Sponsored by: DARPA, AFRL
Added:
head/sys/riscv/riscv/soc.c (contents, props changed)
Modified:
head/sys/conf/files.riscv
Modified: head/sys/conf/files.riscv
==============================================================================
--- head/sys/conf/files.riscv Tue Jun 12 16:47:33 2018 (r335005)
+++ head/sys/conf/files.riscv Tue Jun 12 17:07:30 2018 (r335006)
@@ -46,6 +46,7 @@ riscv/riscv/nexus.c standard
riscv/riscv/ofw_machdep.c optional fdt
riscv/riscv/pmap.c standard
riscv/riscv/riscv_console.c optional rcons
+riscv/riscv/soc.c standard
riscv/riscv/stack_machdep.c optional ddb | stack
riscv/riscv/support.S standard
riscv/riscv/swtch.S standard
Added: head/sys/riscv/riscv/soc.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/riscv/riscv/soc.c Tue Jun 12 17:07:30 2018 (r335006)
@@ -0,0 +1,111 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2018 Ruslan Bukin <b...@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * 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 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 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+
+#include <dev/fdt/simplebus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+struct soc_softc {
+ device_t dev;
+};
+
+static int
+soc_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "riscv-virtio-soc"))
+ return (ENXIO);
+
+ device_set_desc(dev, "RISC-V SoC");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+soc_attach(device_t dev)
+{
+ struct soc_softc *sc;
+ phandle_t node;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ node = ofw_bus_get_node(dev);
+ if (node == -1)
+ return (ENXIO);
+
+ simplebus_init(dev, node);
+
+ /*
+ * Allow devices to identify.
+ */
+ bus_generic_probe(dev);
+
+ /*
+ * Now walk the OFW tree and attach top-level devices.
+ */
+ for (node = OF_child(node); node > 0; node = OF_peer(node))
+ simplebus_add_device(dev, node, 0, NULL, -1, NULL);
+
+ return (bus_generic_attach(dev));
+}
+
+static int
+soc_detach(device_t dev)
+{
+
+ return (0);
+}
+
+static device_method_t soc_methods[] = {
+ DEVMETHOD(device_probe, soc_probe),
+ DEVMETHOD(device_attach, soc_attach),
+ DEVMETHOD(device_detach, soc_detach),
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_1(soc, soc_driver, soc_methods, sizeof(struct soc_softc),
+ simplebus_driver);
+static devclass_t soc_devclass;
+EARLY_DRIVER_MODULE(soc, simplebus, soc_driver, soc_devclass, 0, 0,
+ BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
+MODULE_VERSION(soc, 1);
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