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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019-2022 Linaro Limited
*/
#define LOG_CATEGORY UCLASS_RESET
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <reset-uclass.h>
#include <scmi_agent.h>
#include <scmi_protocols.h>
#include <asm/types.h>
/**
* struct scmi_reset_priv - Private data for SCMI reset controller
* @channel: Reference to the SCMI channel to use
*/
struct scmi_reset_priv {
struct scmi_channel *channel;
};
static int scmi_reset_set_level(struct reset_ctl *rst, bool assert_not_deassert)
{
struct scmi_reset_priv *priv = dev_get_priv(rst->dev);
struct scmi_rd_reset_in in = {
.domain_id = rst->id,
.flags = assert_not_deassert ? SCMI_RD_RESET_FLAG_ASSERT : 0,
.reset_state = 0,
};
struct scmi_rd_reset_out out;
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
SCMI_RESET_DOMAIN_RESET,
in, out);
int ret;
ret = devm_scmi_process_msg(rst->dev, priv->channel, &msg);
if (ret)
return ret;
return scmi_to_linux_errno(out.status);
}
static int scmi_reset_assert(struct reset_ctl *rst)
{
return scmi_reset_set_level(rst, true);
}
static int scmi_reset_deassert(struct reset_ctl *rst)
{
return scmi_reset_set_level(rst, false);
}
static int scmi_reset_request(struct reset_ctl *rst)
{
struct scmi_reset_priv *priv = dev_get_priv(rst->dev);
struct scmi_rd_attr_in in = {
.domain_id = rst->id,
};
struct scmi_rd_attr_out out;
struct scmi_msg msg = SCMI_MSG_IN(SCMI_PROTOCOL_ID_RESET_DOMAIN,
SCMI_RESET_DOMAIN_ATTRIBUTES,
in, out);
int ret;
/*
* We don't really care about the attribute, just check
* the reset domain exists.
*/
ret = devm_scmi_process_msg(rst->dev, priv->channel, &msg);
if (ret)
return ret;
return scmi_to_linux_errno(out.status);
}
static const struct reset_ops scmi_reset_domain_ops = {
.request = scmi_reset_request,
.rst_assert = scmi_reset_assert,
.rst_deassert = scmi_reset_deassert,
};
static int scmi_reset_probe(struct udevice *dev)
{
struct scmi_reset_priv *priv = dev_get_priv(dev);
return devm_scmi_of_get_channel(dev, &priv->channel);
}
U_BOOT_DRIVER(scmi_reset_domain) = {
.name = "scmi_reset_domain",
.id = UCLASS_RESET,
.ops = &scmi_reset_domain_ops,
.probe = scmi_reset_probe,
.priv_auto = sizeof(struct scmi_reset_priv *),
};
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