LXR linux/arch/powerpc/kernel/prom

   1// SPDX-License-Identifier: GPL-2.0
   2#undef DEBUG
   3
   4#include <linux/kernel.h>
   5#include <linux/string.h>
   6#include <linux/ioport.h>
   7#include <linux/etherdevice.h>
   8#include <linux/of_address.h>
   9#include <asm/prom.h>
  10
  11void of_parse_dma_window(struct device_node *dn, const __be32 *dma_window,
  12                         unsigned long *busno, unsigned long *phys,
  13                         unsigned long *size)
  14{
  15        u32 cells;
  16        const __be32 *prop;
  17
  18        /* busno is always one cell */
  19        *busno = of_read_number(dma_window, 1);
  20        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 ? of_read_number(prop, 1) : 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 ? of_read_number(prop, 1) : of_n_size_cells(dn);
  33        *size = of_read_number(dma_window, cells);
  34}
  35