arch/powerpc/kernel/prom_parse.c

   1 #undef DEBUG
   2
   3 #include <linux/kernel.h>
   4 #include <linux/string.h>
   5 #include <linux/module.h>
   6 #include <linux/ioport.h>
   7 #include <linux/etherdevice.h>
   8 #include <linux/of_address.h>
   9 #include <asm/prom.h>
  10
  11 void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
  12                 unsigned long *busno, unsigned long *phys, unsigned long *size)
  13 {
  14         const u32 *dma_window;
  15         u32 cells;
  16         const unsigned char *prop;
  17
  18         dma_window = dma_window_prop;
  19
  20         /* busno is always one cell */
  21         *busno = *(dma_window++);
  22
  23         prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
  24         if (!prop)
  25                 prop = of_get_property(dn, "#address-cells", NULL);
  26
  27         cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
  28         *phys = of_read_number(dma_window, cells);
  29
  30         dma_window += cells;
  31
  32         prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
  33         cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
  34         *size = of_read_number(dma_window, cells);
  35 }