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 void *dma_window_prop,
  11                unsigned long *busno, unsigned long *phys, unsigned long *size)
  12{
  13        const u32 *dma_window;
  14        u32 cells;
  15        const unsigned char *prop;
  16
  17        dma_window = dma_window_prop;
  18
  19        /* busno is always one cell */
  20        *busno = *(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 ? *(u32 *)prop : 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 ? *(u32 *)prop : of_n_size_cells(dn);
  33        *size = of_read_number(dma_window, cells);
  34}
  35