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 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 }