1 files changed, 49 insertions, 0 deletions
diff --git a/sys/dev/ofw/ofw_subr.h b/sys/dev/ofw/ofw_subr.h
new file mode 100644
index 000000000000..8fa64b2b9726
--- /dev/null
+++ b/sys/dev/ofw/ofw_subr.h
@@ -0,0 +1,49 @@
+/*-
+ * Copyright (c) 2015 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_DEV_OFW_OFW_SUBR_H_
+#define	_DEV_OFW_OFW_SUBR_H_
+
+/*
+ * Translate an address from the Nth tuple of a device node's reg properties to
+ * a physical memory address, by applying the range mappings from all ancestors.
+ * This assumes that all ancestor ranges are simple numerical offsets for which
+ * addition and subtraction operations will perform the required mapping (the
+ * bit-options in the high word of standard PCI properties are also handled).
+ * After the call, *pci_hi (if non-NULL) contains the phys.hi cell of the
+ * device's parent PCI bus, or OFW_PADDR_NOT_PCI if no PCI bus is involved.
+ *
+ * This is intended to be a helper function called by the platform-specific
+ * implementation of OF_decode_addr(), and not for direct use by device drivers.
+ */
+#define	OFW_PADDR_NOT_PCI	(~0)
+
+int ofw_reg_to_paddr(phandle_t _dev, int _regno, bus_addr_t *_paddr,
+    bus_size_t *_size, pcell_t *_pci_hi);
+
+#endif