prom_parse.c

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#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);
}