kernel/arch/powerpc/kernel/prom_parse.c

   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
  10 void 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 }