1#undef DEBUG
2
3#include <linux/export.h>
4#include <linux/kernel.h>
5#include <linux/string.h>
6#include <linux/ioport.h>
7#include <linux/etherdevice.h>
8#include <linux/of_address.h>
9#include <asm/prom.h>
10
11void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
12		unsigned long *busno, unsigned long *phys, unsigned long *size)
13{
14	const u32 *dma_window;
15	u32 cells;
16	const unsigned char *prop;
17
18	dma_window = dma_window_prop;
19
20	/* busno is always one cell */
21	*busno = *(dma_window++);
22
23	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
24	if (!prop)
25		prop = of_get_property(dn, "#address-cells", NULL);
26
27	cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
28	*phys = of_read_number(dma_window, cells);
29
30	dma_window += cells;
31
32	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
33	cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
34	*size = of_read_number(dma_window, cells);
35}
36