From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/powerpc/kernel/prom_parse.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 arch/powerpc/kernel/prom_parse.c

(limited to 'arch/powerpc/kernel/prom_parse.c')

diff --git a/arch/powerpc/kernel/prom_parse.c b/arch/powerpc/kernel/prom_parse.c
new file mode 100644
index 000000000..9cb7f88df
--- /dev/null
+++ b/arch/powerpc/kernel/prom_parse.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/etherdevice.h>
+#include <linux/of_address.h>
+#include <asm/prom.h>
+
+void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window,
+			 unsigned long *busno, unsigned long *phys,
+			 unsigned long *size)
+{
+	u32 cells;
+	const __be32 *prop;
+
+	/* busno is always one cell */
+	*busno = of_read_number(dma_window, 1);
+	dma_window++;
+
+	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
+	if (!prop)
+		prop = of_get_property(dn, "#address-cells", NULL);
+
+	cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn);
+	*phys = of_read_number(dma_window, cells);
+
+	dma_window += cells;
+
+	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
+	cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn);
+	*size = of_read_number(dma_window, cells);
+}
-- 
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