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         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
  43 static 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
  49 static 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
  55 static 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
  61 static 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
  67 int 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 }