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dc606c5205
This driver uses the services provided by the BPMP firmware driver to implement a reset driver based on the MRQ_RESET request. Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Thierry Reding <treding@nvidia.com>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* Copyright (C) 2016 NVIDIA Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/reset-controller.h>
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#include <soc/tegra/bpmp.h>
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#include <soc/tegra/bpmp-abi.h>
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static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc)
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{
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return container_of(rstc, struct tegra_bpmp, rstc);
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}
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static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc,
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enum mrq_reset_commands command,
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unsigned int id)
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{
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struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc);
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struct mrq_reset_request request;
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struct tegra_bpmp_message msg;
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memset(&request, 0, sizeof(request));
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request.cmd = command;
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request.reset_id = id;
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memset(&msg, 0, sizeof(msg));
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msg.mrq = MRQ_RESET;
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msg.tx.data = &request;
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msg.tx.size = sizeof(request);
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return tegra_bpmp_transfer(bpmp, &msg);
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}
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static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc,
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unsigned long id)
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{
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return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id);
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}
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static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc,
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unsigned long id)
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{
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return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id);
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}
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static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc,
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unsigned long id)
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{
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return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id);
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}
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static const struct reset_control_ops tegra_bpmp_reset_ops = {
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.reset = tegra_bpmp_reset_module,
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.assert = tegra_bpmp_reset_assert,
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.deassert = tegra_bpmp_reset_deassert,
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};
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int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
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{
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bpmp->rstc.ops = &tegra_bpmp_reset_ops;
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bpmp->rstc.owner = THIS_MODULE;
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bpmp->rstc.of_node = bpmp->dev->of_node;
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bpmp->rstc.nr_resets = bpmp->soc->num_resets;
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return devm_reset_controller_register(bpmp->dev, &bpmp->rstc);
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}
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