target/linux/mvebu/patches-3.8/032-arm_plat_orion_introduce_orion_alloc_free_cpu_win.patch

   1 In the address decoding code, we implement two new functions:
   2 orion_alloc_cpu_win() and orion_free_cpu_win(). The first function
   3 finds an unused address decoding window, and configures it according
   4 to the given arguments (in terms of base address, size, target,
   5 attributes). The second function frees an address decoding window,
   6 given a physical base address.
   7
   8 Those two new functions will be used by the PCIe code, which needs to
   9 dynamically register address decoding windows depending on the PCIe
  10 devices that are detected.
  11
  12 The orion_free_cpu_win() function is only here to handle error cases
  13 in the PCIe devices initialization, in the normal case, address
  14 decoding windows are never freed.
  15
  16 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  17 ---
  18  arch/arm/plat-orion/addr-map.c              |   50 +++++++++++++++++++++++++++
  19  arch/arm/plat-orion/include/plat/addr-map.h |    7 ++++
  20  2 files changed, 57 insertions(+)
  21
  22 --- a/arch/arm/plat-orion/addr-map.c
  23 +++ b/arch/arm/plat-orion/addr-map.c
  24 @@ -109,6 +109,56 @@ static void __init orion_disable_cpu_win
  25  }
  26
  27  /*
  28 + * Find an unused address decoding window, and enable it according to
  29 + * the arguments passed (base, size, target, attributes, remap).
  30 + */
  31 +int __init orion_alloc_cpu_win(const struct orion_addr_map_cfg *cfg,
  32 +                              const u32 base, const u32 size,
  33 +                              const u8 target, const u8 attr, const int remap)
  34 +{
  35 +       int win;
  36 +
  37 +       for (win = 0; win < cfg->num_wins; win++) {
  38 +               void __iomem *addr = cfg->win_cfg_base(cfg, win);
  39 +               u32 ctrl = readl(addr + WIN_CTRL_OFF);
  40 +               if (!(ctrl & WIN_CTRL_ENABLE))
  41 +                       break;
  42 +       }
  43 +
  44 +       /* No more windows available */
  45 +       if (win == cfg->num_wins)
  46 +               return -ENOMEM;
  47 +
  48 +       orion_setup_cpu_win(cfg, win, base, size, target, attr, remap);
  49 +       return 0;
  50 +}
  51 +
  52 +/*
  53 + * Free an address decoding window, given its base address.
  54 + */
  55 +int __init orion_free_cpu_win(const struct orion_addr_map_cfg *cfg,
  56 +                             const u32 base)
  57 +{
  58 +       int win;
  59 +
  60 +       for (win = 0; win < cfg->num_wins; win++) {
  61 +               void __iomem *addr = cfg->win_cfg_base(cfg, win);
  62 +               u32 winbase = readl(addr + WIN_BASE_OFF);
  63 +               u32 ctrl = readl(addr + WIN_CTRL_OFF);
  64 +
  65 +               if (!(ctrl & WIN_CTRL_ENABLE))
  66 +                       continue;
  67 +
  68 +               if (winbase == (base & 0xffff0000)) {
  69 +                       orion_disable_cpu_win(cfg, win);
  70 +                       return 0;
  71 +               }
  72 +       }
  73 +
  74 +       return -EINVAL;
  75 +}
  76 +
  77 +/*
  78   * Configure a number of windows.
  79   */
  80  static void __init orion_setup_cpu_wins(const struct orion_addr_map_cfg * cfg,
  81 --- a/arch/arm/plat-orion/include/plat/addr-map.h
  82 +++ b/arch/arm/plat-orion/include/plat/addr-map.h
  83 @@ -49,6 +49,13 @@ void __init orion_setup_cpu_win(const st
  84                                 const u32 size, const u8 target,
  85                                 const u8 attr, const int remap);
  86
  87 +int __init orion_alloc_cpu_win(const struct orion_addr_map_cfg *cfg,
  88 +                              const u32 base, const u32 size,
  89 +                              const u8 target, const u8 attr, const int remap);
  90 +
  91 +int __init orion_free_cpu_win(const struct orion_addr_map_cfg *cfg,
  92 +                             const u32 base);
  93 +
  94  void __init orion_setup_cpu_mbus_target(const struct orion_addr_map_cfg *cfg,
  95                                         const void __iomem *ddr_window_cpu_base);
  96  #endif