target/linux/bcm53xx/patches-3.18/061-bcma-get-IRQ-numbers-from-dt.patch

   1 From 4eb6a1fd46965ed6c3fb9327276eb53a3021eaaa Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Thu, 9 Jan 2014 19:40:14 +0100
   4 Subject: [PATCH 3/3] bcma: get IRQ numbers from dt
   5
   6 It is not possible to auto detect the irq numbers used by the cores on
   7 an arm SoC. If bcma was registered with device tree it will search for
   8 some device tree nodes with the irq number and add it to the core
   9 configuration.
  10
  11 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  12 ---
  13  Documentation/devicetree/bindings/bus/bcma.txt | 21 +++++++++++
  14  drivers/bcma/main.c                            | 52 +++++++++++++++++++++++++-
  15  2 files changed, 72 insertions(+), 1 deletion(-)
  16
  17 --- a/Documentation/devicetree/bindings/bus/bcma.txt
  18 +++ b/Documentation/devicetree/bindings/bus/bcma.txt
  19 @@ -8,6 +8,11 @@ Required properties:
  20
  21  The cores on the AXI bus are automatically detected by bcma with the
  22  memory ranges they are using and they get registered afterwards.
  23 +Automatic detection of the IRQ number is not working on
  24 +BCM47xx/BCM53xx ARM SoCs. To assign IRQ numbers to the cores, provide
  25 +them manually through device tree. Use an interrupt-map to specify the
  26 +IRQ used by the devices on the bus. The first address is just an index,
  27 +because we do not have any special register.
  28
  29  The top-level axi bus may contain children representing attached cores
  30  (devices). This is needed since some hardware details can't be auto
  31 @@ -22,6 +27,22 @@ Example:
  32                 ranges = <0x00000000 0x18000000 0x00100000>;
  33                 #address-cells = <1>;
  34                 #size-cells = <1>;
  35 +               #interrupt-cells = <1>;
  36 +               interrupt-map-mask = <0x000fffff 0xffff>;
  37 +               interrupt-map =
  38 +                       /* Ethernet Controller 0 */
  39 +                       <0x00024000 0 &gic GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
  40 +
  41 +                       /* Ethernet Controller 1 */
  42 +                       <0x00025000 0 &gic GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>;
  43 +
  44 +                       /* PCIe Controller 0 */
  45 +                       <0x00012000 0 &gic GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>,
  46 +                       <0x00012000 1 &gic GIC_SPI 127 IRQ_TYPE_LEVEL_HIGH>,
  47 +                       <0x00012000 2 &gic GIC_SPI 128 IRQ_TYPE_LEVEL_HIGH>,
  48 +                       <0x00012000 3 &gic GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>,
  49 +                       <0x00012000 4 &gic GIC_SPI 130 IRQ_TYPE_LEVEL_HIGH>,
  50 +                       <0x00012000 5 &gic GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>;
  51
  52                 chipcommon {
  53                         reg = <0x00000000 0x1000>;
  54 --- a/drivers/bcma/main.c
  55 +++ b/drivers/bcma/main.c
  56 @@ -11,6 +11,7 @@
  57  #include <linux/bcma/bcma.h>
  58  #include <linux/slab.h>
  59  #include <linux/of_address.h>
  60 +#include <linux/of_irq.h>
  61
  62  MODULE_DESCRIPTION("Broadcom's specific AMBA driver");
  63  MODULE_LICENSE("GPL");
  64 @@ -153,6 +154,46 @@ static struct device_node *bcma_of_find_
  65         return NULL;
  66  }
  67
  68 +static int bcma_of_irq_parse(struct platform_device *parent,
  69 +                            struct bcma_device *core,
  70 +                            struct of_phandle_args *out_irq, int num)
  71 +{
  72 +       __be32 laddr[1];
  73 +       int rc;
  74 +
  75 +       if (core->dev.of_node) {
  76 +               rc = of_irq_parse_one(core->dev.of_node, num, out_irq);
  77 +               if (!rc)
  78 +                       return rc;
  79 +       }
  80 +
  81 +       out_irq->np = parent->dev.of_node;
  82 +       out_irq->args_count = 1;
  83 +       out_irq->args[0] = num;
  84 +
  85 +       laddr[0] = cpu_to_be32(core->addr);
  86 +       return of_irq_parse_raw(laddr, out_irq);
  87 +}
  88 +
  89 +static unsigned int bcma_of_get_irq(struct platform_device *parent,
  90 +                                   struct bcma_device *core, int num)
  91 +{
  92 +       struct of_phandle_args out_irq;
  93 +       int ret;
  94 +
  95 +       if (!parent || !parent->dev.of_node)
  96 +               return 0;
  97 +
  98 +       ret = bcma_of_irq_parse(parent, core, &out_irq, num);
  99 +       if (ret) {
 100 +               bcma_debug(core->bus, "bcma_of_get_irq() failed with rc=%d\n",
 101 +                          ret);
 102 +               return 0;
 103 +       }
 104 +
 105 +       return irq_create_of_mapping(&out_irq);
 106 +}
 107 +
 108  static void bcma_of_fill_device(struct platform_device *parent,
 109                                 struct bcma_device *core)
 110  {
 111 @@ -161,12 +202,19 @@ static void bcma_of_fill_device(struct p
 112         node = bcma_of_find_child_device(parent, core);
 113         if (node)
 114                 core->dev.of_node = node;
 115 +
 116 +       core->irq = bcma_of_get_irq(parent, core, 0);
 117  }
 118  #else
 119  static void bcma_of_fill_device(struct platform_device *parent,
 120                                 struct bcma_device *core)
 121  {
 122  }
 123 +static inline unsigned int bcma_of_get_irq(struct platform_device *parent,
 124 +                                          struct bcma_device *core, int num)
 125 +{
 126 +       return 0;
 127 +}
 128  #endif /* CONFIG_OF */
 129
 130  unsigned int bcma_core_irq(struct bcma_device *core, int num)
 131 @@ -182,7 +230,9 @@ unsigned int bcma_core_irq(struct bcma_d
 132                         mips_irq = bcma_core_mips_irq(core);
 133                         return mips_irq <= 4 ? mips_irq + 2 : 0;
 134                 }
 135 -               break;
 136 +               if (bus->host_pdev)
 137 +                       return bcma_of_get_irq(bus->host_pdev, core, num);
 138 +               return 0;
 139         case BCMA_HOSTTYPE_SDIO:
 140                 return 0;
 141         }