LXR linux/arch/powerpc/kernel/prom

   1#undef DEBUG
   2
   3#include <linux/kernel.h>
   4#include <linux/string.h>
   5#include <linux/ioport.h>
   6#include <linux/etherdevice.h>
   7#include <linux/of_address.h>
   8#include <asm/prom.h>
   9
  10void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window,
  11                         unsigned long *busno, unsigned long *phys,
  12                         unsigned long *size)
  13{
  14        u32 cells;
  15        const __be32 *prop;
  16
  17        /* busno is always one cell */
  18        *busno = of_read_number(dma_window, 1);
  19        dma_window++;
  20
  21        prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
  22        if (!prop)
  23                prop = of_get_property(dn, "#address-cells", NULL);
  24
  25        cells = prop ? of_read_number(prop, 1) : of_n_addr_cells(dn);
  26        *phys = of_read_number(dma_window, cells);
  27
  28        dma_window += cells;
  29
  30        prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
  31        cells = prop ? of_read_number(prop, 1) : of_n_size_cells(dn);
  32        *size = of_read_number(dma_window, cells);
  33}
  34