target/linux/lantiq/patches-3.18/0005-MIPS-lantiq-add-reset-controller-api-support.patch

   1 From 223f1c46e109a8420765aee099a5d1dc4ab7ee98 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Tue, 3 Sep 2013 13:18:12 +0200
   4 Subject: [PATCH 05/36] MIPS: lantiq: add reset-controller api support
   5
   6 Add a reset-controller binding for the reset registers found on the lantiq
   7 SoC.
   8
   9 Signed-off-by: John Crispin <blogic@openwrt.org>
  10 ---
  11  arch/mips/lantiq/xway/reset.c |   61 +++++++++++++++++++++++++++++++++++++++++
  12  1 file changed, 61 insertions(+)
  13
  14 --- a/arch/mips/lantiq/xway/reset.c
  15 +++ b/arch/mips/lantiq/xway/reset.c
  16 @@ -14,6 +14,7 @@
  17  #include <linux/delay.h>
  18  #include <linux/of_address.h>
  19  #include <linux/of_platform.h>
  20 +#include <linux/reset-controller.h>
  21
  22  #include <asm/reboot.h>
  23
  24 @@ -113,6 +114,66 @@ void ltq_reset_once(unsigned int module,
  25         ltq_rcu_w32(ltq_rcu_r32(RCU_RST_REQ) & ~module, RCU_RST_REQ);
  26  }
  27
  28 +static int ltq_assert_device(struct reset_controller_dev *rcdev,
  29 +                               unsigned long id)
  30 +{
  31 +       u32 val;
  32 +
  33 +       if (id < 8)
  34 +               return -1;
  35 +
  36 +       val = ltq_rcu_r32(RCU_RST_REQ);
  37 +       val |= BIT(id);
  38 +       ltq_rcu_w32(val, RCU_RST_REQ);
  39 +
  40 +       return 0;
  41 +}
  42 +
  43 +static int ltq_deassert_device(struct reset_controller_dev *rcdev,
  44 +                                 unsigned long id)
  45 +{
  46 +       u32 val;
  47 +
  48 +       if (id < 8)
  49 +               return -1;
  50 +
  51 +       val = ltq_rcu_r32(RCU_RST_REQ);
  52 +       val &= ~BIT(id);
  53 +       ltq_rcu_w32(val, RCU_RST_REQ);
  54 +
  55 +       return 0;
  56 +}
  57 +
  58 +static int ltq_reset_device(struct reset_controller_dev *rcdev,
  59 +                              unsigned long id)
  60 +{
  61 +       ltq_assert_device(rcdev, id);
  62 +       return ltq_deassert_device(rcdev, id);
  63 +}
  64 +
  65 +static struct reset_control_ops reset_ops = {
  66 +       .reset = ltq_reset_device,
  67 +       .assert = ltq_assert_device,
  68 +       .deassert = ltq_deassert_device,
  69 +};
  70 +
  71 +static struct reset_controller_dev reset_dev = {
  72 +       .ops                    = &reset_ops,
  73 +       .owner                  = THIS_MODULE,
  74 +       .nr_resets              = 32,
  75 +       .of_reset_n_cells       = 1,
  76 +};
  77 +
  78 +void ltq_rst_init(void)
  79 +{
  80 +       reset_dev.of_node = of_find_compatible_node(NULL, NULL,
  81 +                                               "lantiq,xway-reset");
  82 +       if (!reset_dev.of_node)
  83 +               pr_err("Failed to find reset controller node");
  84 +       else
  85 +               reset_controller_register(&reset_dev);
  86 +}
  87 +
  88  static void ltq_machine_restart(char *command)
  89  {
  90         local_irq_disable();