1 files changed, 125 insertions, 0 deletions
diff --git a/sys/mips/mediatek/fdt_reset.c b/sys/mips/mediatek/fdt_reset.c
new file mode 100644
index 0000000..5ff2758
--- /dev/null
+++ b/sys/mips/mediatek/fdt_reset.c
@@ -0,0 +1,125 @@
+/*-
+ * Copyright (c) 2016 Stanislav Galabov
+ * Copyright (c) 2014 Ian Lepore <ian@freebsd.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/queue.h>
+#include <sys/systm.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "fdt_reset_if.h"
+#include <mips/mediatek/fdt_reset.h>
+
+/*
+ * Loop through all the tuples in the resets= property for a device, asserting
+ * or deasserting each reset.
+ *
+ * Be liberal about errors for now: warn about a failure to (de)assert but keep
+ * trying with any other resets in the list.  Return ENXIO if any errors were
+ * found, and let the caller decide whether the problem is fatal.
+ */
+static int
+assert_deassert_all(device_t consumer, boolean_t assert)
+{
+	phandle_t rnode;
+	device_t resetdev;
+	int resetnum, err, i, ncells;
+	uint32_t *resets;
+	boolean_t anyerrors;
+
+	rnode = ofw_bus_get_node(consumer);
+	ncells = OF_getencprop_alloc(rnode, "resets", sizeof(*resets),
+	    (void **)&resets);
+	if (!assert && ncells < 2) {
+		device_printf(consumer, "Warning: No resets specified in fdt "
+		    "data; device may not function.");
+		return (ENXIO);
+	}
+	anyerrors = false;
+	for (i = 0; i < ncells; i += 2) {
+		resetdev = OF_device_from_xref(resets[i]);
+		resetnum = resets[i + 1];
+		if (resetdev == NULL) {
+			if (!assert)
+				device_printf(consumer, "Warning: can not find "
+				    "driver for reset number %u; device may "
+				    "not function\n", resetnum);
+			anyerrors = true;
+			continue;
+		}
+		if (assert)
+			err = FDT_RESET_ASSERT(resetdev, resetnum);
+		else
+			err = FDT_RESET_DEASSERT(resetdev, resetnum);
+		if (err != 0) {
+			if (!assert)
+				device_printf(consumer, "Warning: failed to "
+				    "deassert reset number %u; device may not "
+				    "function\n", resetnum);
+			anyerrors = true;
+		}
+	}
+	free(resets, M_OFWPROP);
+	return (anyerrors ? ENXIO : 0);
+}
+
+int
+fdt_reset_assert_all(device_t consumer)
+{
+
+	return (assert_deassert_all(consumer, true));
+}
+
+int
+fdt_reset_deassert_all(device_t consumer)
+{
+
+	return (assert_deassert_all(consumer, false));
+}
+
+void
+fdt_reset_register_provider(device_t provider)
+{
+
+	OF_device_register_xref(
+	    OF_xref_from_node(ofw_bus_get_node(provider)), provider);
+}
+
+void
+fdt_reset_unregister_provider(device_t provider)
+{
+
+	OF_device_register_xref(OF_xref_from_device(provider), NULL);
+}
+