[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / kernel / prom_parse.c

#undef DEBUG

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/module.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 void *dma_window_prop,
		unsigned long *busno, unsigned long *phys, unsigned long *size)
{
	const u32 *dma_window;
	u32 cells;
	const unsigned char *prop;

	dma_window = dma_window_prop;

	/* busno is always one cell */
	*busno = *(dma_window++);

	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
	if (!prop)
		prop = of_get_property(dn, "#address-cells", NULL);

	cells = prop ? *(u32 *)prop : 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 ? *(u32 *)prop : of_n_size_cells(dn);
	*size = of_read_number(dma_window, cells);
}
Commit	Line	Data
	1	#undef DEBUG
	2
	3	#include <linux/kernel.h>
	4	#include <linux/string.h>
	5	#include <linux/module.h>
	6	#include <linux/ioport.h>
	7	#include <linux/etherdevice.h>
	8	#include <linux/of_address.h>
	9	#include <asm/prom.h>
	10
	11	void 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	}