LXR linux/drivers/reset/tegra/reset-bpmp.c

   1/*
   2 * Copyright (C) 2016 NVIDIA Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8
   9#include <linux/reset-controller.h>
  10
  11#include <soc/tegra/bpmp.h>
  12#include <soc/tegra/bpmp-abi.h>
  13
  14static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
  15{
  16        return container_of(rstc, struct tegra_bpmp, rstc);
  17}
  18
  19static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
  20                                   enum mrq_reset_commands command,
  21                                   unsigned int id)
  22{
  23        struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
  24        struct mrq_reset_request request;
  25        struct tegra_bpmp_message msg;
  26
  27        memset(&request, 0, sizeof(request));
  28        request.cmd = command;
  29        request.reset_id = id;
  30
  31        memset(&msg, 0, sizeof(msg));
  32        msg.mrq = MRQ_RESET;
  33        msg.tx.data = &request;
  34        msg.tx.size = sizeof(request);
  35
  36        return tegra_bpmp_transfer(bpmp, &msg);
  37}
  38
  39static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
  40                                   unsigned long id)
  41{
  42        return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
  43}
  44
  45static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
  46                                   unsigned long id)
  47{
  48        return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
  49}
  50
  51static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
  52                                     unsigned long id)
  53{
  54        return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
  55}
  56
  57static const struct reset_control_ops tegra_bpmp_reset_ops = {
  58        .reset = tegra_bpmp_reset_module,
  59        .assert = tegra_bpmp_reset_assert,
  60        .deassert = tegra_bpmp_reset_deassert,
  61};
  62
  63int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
  64{
  65        bpmp->rstc.ops = &tegra_bpmp_reset_ops;
  66        bpmp->rstc.owner = THIS_MODULE;
  67        bpmp->rstc.of_node = bpmp->dev->of_node;
  68        bpmp->rstc.nr_resets = bpmp->soc->num_resets;
  69
  70        return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
  71}
  72