target/linux/bcm53xx/patches-3.14/123-bcma-get-sprom-from-devicetree.patch

   1 From 5d94449a92e4121b408e7cb8931a47984135eeea Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sun, 4 May 2014 14:34:31 +0200
   4 Subject: [PATCH 07/15] bcma: get sprom from devicetree
   5
   6 This patch make it possible to device an sprom provider in device tree
   7 and get the sprom from this driver. Every time there is such a provider
   8 it gets asked for a sprom.
   9
  10 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  11 ---
  12  drivers/bcma/sprom.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
  13  1 file changed, 50 insertions(+), 1 deletion(-)
  14
  15 --- a/drivers/bcma/sprom.c
  16 +++ b/drivers/bcma/sprom.c
  17 @@ -15,6 +15,8 @@
  18  #include <linux/io.h>
  19  #include <linux/dma-mapping.h>
  20  #include <linux/slab.h>
  21 +#include <linux/of.h>
  22 +#include <linux/of_platform.h>
  23
  24  static int(*get_fallback_sprom)(struct bcma_bus *dev, struct ssb_sprom *out);
  25
  26 @@ -46,6 +48,46 @@ int bcma_arch_register_fallback_sprom(in
  27         return 0;
  28  }
  29
  30 +#ifdef CONFIG_OF
  31 +static int bcma_fill_sprom_with_dt(struct bcma_bus *bus,
  32 +                                  struct ssb_sprom *out)
  33 +{
  34 +       const phandle *handle;
  35 +       struct device_node *sprom_node;
  36 +       struct platform_device *sprom_dev;
  37 +       struct ssb_sprom *sprom;
  38 +
  39 +       if (!bus->host_pdev || !bus->host_pdev->dev.of_node)
  40 +               return -ENOENT;
  41 +
  42 +       handle = of_get_property(bus->host_pdev->dev.of_node, "sprom", NULL);
  43 +       if (!handle)
  44 +               return -ENOENT;
  45 +
  46 +       sprom_node = of_find_node_by_phandle(be32_to_cpup(handle));
  47 +       if (!sprom_node)
  48 +               return -ENOENT;
  49 +
  50 +       sprom_dev = of_find_device_by_node(sprom_node);
  51 +       if (!sprom_dev)
  52 +               return -ENOENT;
  53 +
  54 +       sprom = platform_get_drvdata(sprom_dev);
  55 +       if (!sprom)
  56 +               return -ENOENT;
  57 +
  58 +       memcpy(out, sprom, sizeof(*out));
  59 +
  60 +       return 0;
  61 +}
  62 +#else
  63 +static int bcma_fill_sprom_with_dt(struct bcma_bus *bus,
  64 +                                  struct ssb_sprom *out)
  65 +{
  66 +       return -ENOENT;
  67 +}
  68 +#endif
  69 +
  70  static int bcma_fill_sprom_with_fallback(struct bcma_bus *bus,
  71                                          struct ssb_sprom *out)
  72  {
  73 @@ -553,7 +595,14 @@ int bcma_sprom_get(struct bcma_bus *bus)
  74         u16 *sprom;
  75         size_t sprom_sizes[] = { SSB_SPROMSIZE_WORDS_R4,
  76                                  SSB_SPROMSIZE_WORDS_R10, };
  77 -       int i, err = 0;
  78 +       int i, err;
  79 +
  80 +       err = bcma_fill_sprom_with_dt(bus, &bus->sprom);
  81 +       if (err == 0) {
  82 +               bcma_info(bus, "Found sprom from device tree provider\n");
  83 +               return 0;
  84 +       }
  85 +       err = 0;
  86
  87         if (!bus->drv_cc.core)
  88                 return -EOPNOTSUPP;