1// SPDX-License-Identifier: GPL-2.0
 2#undef DEBUG
 3
 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 __be32 *dma_window,
12			 unsigned long *busno, unsigned long *phys,
13			 unsigned long *size)
14{
15	u32 cells;
16	const __be32 *prop;
17
18	/* busno is always one cell */
19	*busno = of_read_number(dma_window, 1);
20	dma_window++;
21
22	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
23	if (!prop)
24		prop = of_get_property(dn, "#address-cells", NULL);
25
26	cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn);
27	*phys = of_read_number(dma_window, cells);
28
29	dma_window += cells;
30
31	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
32	cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn);
33	*size = of_read_number(dma_window, cells);
34}

 1// SPDX-License-Identifier: GPL-2.0
 2#undef DEBUG
 3
 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 __be32 *dma_window,
12			 unsigned long *busno, unsigned long *phys,
13			 unsigned long *size)
14{
15	u32 cells;
16	const __be32 *prop;
17
18	/* busno is always one cell */
19	*busno = of_read_number(dma_window, 1);
20	dma_window++;
21
22	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
23	if (!prop)
24		prop = of_get_property(dn, "#address-cells", NULL);
25
26	cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn);
27	*phys = of_read_number(dma_window, cells);
28
29	dma_window += cells;
30
31	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
32	cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn);
33	*size = of_read_number(dma_window, cells);
34}