reset/tegra/reset-bpmp.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2016 NVIDIA Corporation
0004  */
0005
0006 #include <linux/reset-controller.h>
0007
0008 #include <soc/tegra/bpmp.h>
0009 #include <soc/tegra/bpmp-abi.h>
0010
0011 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
0012 {
0013     return container_of(rstc, struct tegra_bpmp, rstc);
0014 }
0015
0016 static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
0017                    enum mrq_reset_commands command,
0018                    unsigned int id)
0019 {
0020     struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
0021     struct mrq_reset_request request;
0022     struct tegra_bpmp_message msg;
0023     int err;
0024
0025     memset(&request, 0, sizeof(request));
0026     request.cmd = command;
0027     request.reset_id = id;
0028
0029     memset(&msg, 0, sizeof(msg));
0030     msg.mrq = MRQ_RESET;
0031     msg.tx.data = &request;
0032     msg.tx.size = sizeof(request);
0033
0034     err = tegra_bpmp_transfer(bpmp, &msg);
0035     if (err)
0036         return err;
0037     if (msg.rx.ret)
0038         return -EINVAL;
0039
0040     return 0;
0041 }
0042
0043 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
0044                    unsigned long id)
0045 {
0046     return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
0047 }
0048
0049 static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
0050                    unsigned long id)
0051 {
0052     return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
0053 }
0054
0055 static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
0056                      unsigned long id)
0057 {
0058     return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
0059 }
0060
0061 static const struct reset_control_ops tegra_bpmp_reset_ops = {
0062     .reset = tegra_bpmp_reset_module,
0063     .assert = tegra_bpmp_reset_assert,
0064     .deassert = tegra_bpmp_reset_deassert,
0065 };
0066
0067 int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
0068 {
0069     bpmp->rstc.ops = &tegra_bpmp_reset_ops;
0070     bpmp->rstc.owner = THIS_MODULE;
0071     bpmp->rstc.of_node = bpmp->dev->of_node;
0072     bpmp->rstc.nr_resets = bpmp->soc->num_resets;
0073
0074     return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
0075 }