drivers/reset/tegra186-reset.c

   1 /*
   2  * Copyright (c) 2016, NVIDIA CORPORATION.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <misc.h>
  10 #include <reset-uclass.h>
  11 #include <asm/arch-tegra/bpmp_abi.h>
  12
  13 static int tegra186_reset_request(struct reset_ctl *reset_ctl)
  14 {
  15         debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  16               reset_ctl->dev, reset_ctl->id);
  17
  18         return 0;
  19 }
  20
  21 static int tegra186_reset_free(struct reset_ctl *reset_ctl)
  22 {
  23         debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  24               reset_ctl->dev, reset_ctl->id);
  25
  26         return 0;
  27 }
  28
  29 static int tegra186_reset_common(struct reset_ctl *reset_ctl,
  30                                  enum mrq_reset_commands cmd)
  31 {
  32         struct mrq_reset_request req;
  33         int ret;
  34
  35         req.cmd = cmd;
  36         req.reset_id = reset_ctl->id;
  37
  38         ret = misc_call(reset_ctl->dev->parent, MRQ_RESET, &req, sizeof(req),
  39                         NULL, 0);
  40         if (ret < 0)
  41                 return ret;
  42
  43         return 0;
  44 }
  45
  46 static int tegra186_reset_assert(struct reset_ctl *reset_ctl)
  47 {
  48         debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  49               reset_ctl->dev, reset_ctl->id);
  50
  51         return tegra186_reset_common(reset_ctl, CMD_RESET_ASSERT);
  52 }
  53
  54 static int tegra186_reset_deassert(struct reset_ctl *reset_ctl)
  55 {
  56         debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  57               reset_ctl->dev, reset_ctl->id);
  58
  59         return tegra186_reset_common(reset_ctl, CMD_RESET_DEASSERT);
  60 }
  61
  62 struct reset_ops tegra186_reset_ops = {
  63         .request = tegra186_reset_request,
  64         .free = tegra186_reset_free,
  65         .rst_assert = tegra186_reset_assert,
  66         .rst_deassert = tegra186_reset_deassert,
  67 };
  68
  69 static int tegra186_reset_probe(struct udevice *dev)
  70 {
  71         debug("%s(dev=%p)\n", __func__, dev);
  72
  73         return 0;
  74 }
  75
  76 U_BOOT_DRIVER(tegra186_reset) = {
  77         .name           = "tegra186_reset",
  78         .id             = UCLASS_RESET,
  79         .probe          = tegra186_reset_probe,
  80         .ops = &tegra186_reset_ops,
  81 };