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
  14 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
  15 {
  16         return container_of(rstc, struct tegra_bpmp, rstc);
  17 }
  18
  19 static 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         int err;
  27
  28         memset(&request, 0, sizeof(request));
  29         request.cmd = command;
  30         request.reset_id = id;
  31
  32         memset(&msg, 0, sizeof(msg));
  33         msg.mrq = MRQ_RESET;
  34         msg.tx.data = &request;
  35         msg.tx.size = sizeof(request);
  36
  37         err = tegra_bpmp_transfer(bpmp, &msg);
  38         if (err)
  39                 return err;
  40         if (msg.rx.ret)
  41                 return -EINVAL;
  42
  43         return 0;
  44 }
  45
  46 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
  47                                    unsigned long id)
  48 {
  49         return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
  50 }
  51
  52 static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
  53                                    unsigned long id)
  54 {
  55         return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
  56 }
  57
  58 static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
  59                                      unsigned long id)
  60 {
  61         return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
  62 }
  63
  64 static const struct reset_control_ops tegra_bpmp_reset_ops = {
  65         .reset = tegra_bpmp_reset_module,
  66         .assert = tegra_bpmp_reset_assert,
  67         .deassert = tegra_bpmp_reset_deassert,
  68 };
  69
  70 int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
  71 {
  72         bpmp->rstc.ops = &tegra_bpmp_reset_ops;
  73         bpmp->rstc.owner = THIS_MODULE;
  74         bpmp->rstc.of_node = bpmp->dev->of_node;
  75         bpmp->rstc.nr_resets = bpmp->soc->num_resets;
  76
  77         return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
  78 }