From 0b1a13b5153c0c9379722c0288bb67a9db057cb7 Mon Sep 17 00:00:00 2001
From: Jeremy Kerr <jk@ozlabs.org>
Date: Thu, 18 May 2006 18:05:15 +1000
Subject: [PATCH] --- yaml --- r: 28709 b: refs/heads/master c:
 d4ad66faecc4dd9f3db14e0b013741a6f867b089 h: refs/heads/master i:   28707:
 183ae73b5bb66a1f590fee65314522a0fd4a79af v: v3

---
 [refs]                                 |  2 +-
 trunk/arch/powerpc/kernel/prom_parse.c | 22 ++++++++++++++++++++++
 trunk/include/asm-powerpc/prom.h       |  6 ++++++
 3 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index bdf4bdbeef03..73a9e64c9507 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8ae5b2801a0beb10a55a7ebd5140482e2f84c3fa
+refs/heads/master: d4ad66faecc4dd9f3db14e0b013741a6f867b089
diff --git a/trunk/arch/powerpc/kernel/prom_parse.c b/trunk/arch/powerpc/kernel/prom_parse.c
index 3934c227549b..23bb060330ef 100644
--- a/trunk/arch/powerpc/kernel/prom_parse.c
+++ b/trunk/arch/powerpc/kernel/prom_parse.c
@@ -548,3 +548,25 @@ int of_pci_address_to_resource(struct device_node *dev, int bar,
 	return __of_address_to_resource(dev, addrp, size, flags, r);
 }
 EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
+
+void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
+		unsigned long *busno, unsigned long *phys, unsigned long *size)
+{
+	u32 *dma_window, cells;
+	unsigned char *prop;
+
+	dma_window = (u32 *)dma_window_prop;
+
+	/* busno is always one cell */
+	*busno = *(dma_window++);
+
+	prop = get_property(dn, "ibm,#dma-address-cells", NULL);
+	cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn);
+	*phys = of_read_addr(dma_window, cells);
+
+	dma_window += cells;
+
+	prop = get_property(dn, "ibm,#dma-size-cells", NULL);
+	cells = prop ? *(u32 *)prop : prom_n_size_cells(dn);
+	*size = of_read_addr(dma_window, cells);
+}
diff --git a/trunk/include/asm-powerpc/prom.h b/trunk/include/asm-powerpc/prom.h
index 97ef1cd71a4d..c79d58ab7441 100644
--- a/trunk/include/asm-powerpc/prom.h
+++ b/trunk/include/asm-powerpc/prom.h
@@ -230,6 +230,12 @@ extern int of_address_to_resource(struct device_node *dev, int index,
 extern int of_pci_address_to_resource(struct device_node *dev, int bar,
 				      struct resource *r);
 
+/* Parse the ibm,dma-window property of an OF node into the busno, phys and
+ * size parameters.
+ */
+void of_parse_dma_window(struct device_node *dn, unsigned char *dma_window_prop,
+		unsigned long *busno, unsigned long *phys, unsigned long *size);
+
 extern void kdump_move_device_tree(void);
 
 #endif /* __KERNEL__ */