LXR linux/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
  11static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
  12{
  13        return container_of(rstc, struct tegra_bpmp, rstc);
  14}
  15
  16static 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        int err;
  24
  25        memset(&request, 0, sizeof(request));
  26        request.cmd = command;
  27        request.reset_id = id;
  28
  29        memset(&msg, 0, sizeof(msg));
  30        msg.mrq = MRQ_RESET;
  31        msg.tx.data = &request;
  32        msg.tx.size = sizeof(request);
  33
  34        err = tegra_bpmp_transfer(bpmp, &msg);
  35        if (err)
  36                return err;
  37        if (msg.rx.ret)
  38                return -EINVAL;
  39
  40        return 0;
  41}
  42
  43static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
  44                                   unsigned long id)
  45{
  46        return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
  47}
  48
  49static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
  50                                   unsigned long id)
  51{
  52        return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
  53}
  54
  55static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
  56                                     unsigned long id)
  57{
  58        return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
  59}
  60
  61static const struct reset_control_ops tegra_bpmp_reset_ops = {
  62        .reset = tegra_bpmp_reset_module,
  63        .assert = tegra_bpmp_reset_assert,
  64        .deassert = tegra_bpmp_reset_deassert,
  65};
  66
  67int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
  68{
  69        bpmp->rstc.ops = &tegra_bpmp_reset_ops;
  70        bpmp->rstc.owner = THIS_MODULE;
  71        bpmp->rstc.of_node = bpmp->dev->of_node;
  72        bpmp->rstc.nr_resets = bpmp->soc->num_resets;
  73
  74        return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
  75}
  76