drivers/reset/tegra/reset-bpmp.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016 NVIDIA Corporation
   4  */
   5
   6 #include <linux/reset-controller.h>
   7
   8 #include <soc/tegra/bpmp.h>
   9 #include <soc/tegra/bpmp-abi.h>
  10
  11 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
  12 {
  13         return container_of(rstc, struct tegra_bpmp, rstc);
  14 }
  15
  16 static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
  17                                    enum mrq_reset_commands command,
  18                                    unsigned int id)
  19 {
  20         struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
  21         struct mrq_reset_request request;
  22         struct tegra_bpmp_message msg;
  23
  24         memset(&request, 0, sizeof(request));
  25         request.cmd = command;
  26         request.reset_id = id;
  27
  28         memset(&msg, 0, sizeof(msg));
  29         msg.mrq = MRQ_RESET;
  30         msg.tx.data = &request;
  31         msg.tx.size = sizeof(request);
  32
  33         return tegra_bpmp_transfer(bpmp, &msg);
  34 }
  35
  36 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
  37                                    unsigned long id)
  38 {
  39         return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
  40 }
  41
  42 static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
  43                                    unsigned long id)
  44 {
  45         return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
  46 }
  47
  48 static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
  49                                      unsigned long id)
  50 {
  51         return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
  52 }
  53
  54 static const struct reset_control_ops tegra_bpmp_reset_ops = {
  55         .reset = tegra_bpmp_reset_module,
  56         .assert = tegra_bpmp_reset_assert,
  57         .deassert = tegra_bpmp_reset_deassert,
  58 };
  59
  60 int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
  61 {
  62         bpmp->rstc.ops = &tegra_bpmp_reset_ops;
  63         bpmp->rstc.owner = THIS_MODULE;
  64         bpmp->rstc.of_node = bpmp->dev->of_node;
  65         bpmp->rstc.nr_resets = bpmp->soc->num_resets;
  66
  67         return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
  68 }