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// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Management Interface (SCMI) Reset Protocol
*
* Copyright (C) 2019 ARM Ltd.
*/
#include "common.h"
enum scmi_reset_protocol_cmd {
RESET_DOMAIN_ATTRIBUTES = 0x3,
RESET = 0x4,
RESET_NOTIFY = 0x5,
};
enum scmi_reset_protocol_notify {
RESET_ISSUED = 0x0,
};
#define NUM_RESET_DOMAIN_MASK 0xffff
#define RESET_NOTIFY_ENABLE BIT(0)
struct scmi_msg_resp_reset_domain_attributes {
__le32 attributes;
#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
__le32 latency;
u8 name[SCMI_MAX_STR_SIZE];
};
struct scmi_msg_reset_domain_reset {
__le32 domain_id;
__le32 flags;
#define AUTONOMOUS_RESET BIT(0)
#define EXPLICIT_RESET_ASSERT BIT(1)
#define ASYNCHRONOUS_RESET BIT(2)
__le32 reset_state;
#define ARCH_RESET_TYPE BIT(31)
#define COLD_RESET_STATE BIT(0)
#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
};
struct reset_dom_info {
bool async_reset;
bool reset_notify;
u32 latency_us;
char name[SCMI_MAX_STR_SIZE];
};
struct scmi_reset_info {
int num_domains;
struct reset_dom_info *dom_info;
};
static int scmi_reset_attributes_get(const struct scmi_handle *handle,
struct scmi_reset_info *pi)
{
int ret;
struct scmi_xfer *t;
u32 attr;
ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
SCMI_PROTOCOL_RESET, 0, sizeof(attr), &t);
if (ret)
return ret;
ret = scmi_do_xfer(handle, t);
if (!ret) {
attr = get_unaligned_le32(t->rx.buf);
pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
}
scmi_xfer_put(handle, t);
return ret;
}
static int
scmi_reset_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
struct reset_dom_info *dom_info)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_resp_reset_domain_attributes *attr;
ret = scmi_xfer_get_init(handle, RESET_DOMAIN_ATTRIBUTES,
SCMI_PROTOCOL_RESET, sizeof(domain),
sizeof(*attr), &t);
if (ret)
return ret;
put_unaligned_le32(domain, t->tx.buf);
attr = t->rx.buf;
ret = scmi_do_xfer(handle, t);
if (!ret) {
u32 attributes = le32_to_cpu(attr->attributes);
dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
dom_info->latency_us = le32_to_cpu(attr->latency);
if (dom_info->latency_us == U32_MAX)
dom_info->latency_us = 0;
strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
}
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_reset_num_domains_get(const struct scmi_handle *handle)
{
struct scmi_reset_info *pi = handle->reset_priv;
return pi->num_domains;
}
static char *scmi_reset_name_get(const struct scmi_handle *handle, u32 domain)
{
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *dom = pi->dom_info + domain;
return dom->name;
}
static int scmi_reset_latency_get(const struct scmi_handle *handle, u32 domain)
{
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *dom = pi->dom_info + domain;
return dom->latency_us;
}
static int scmi_domain_reset(const struct scmi_handle *handle, u32 domain,
u32 flags, u32 state)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_reset_domain_reset *dom;
struct scmi_reset_info *pi = handle->reset_priv;
struct reset_dom_info *rdom = pi->dom_info + domain;
if (rdom->async_reset)
flags |= ASYNCHRONOUS_RESET;
ret = scmi_xfer_get_init(handle, RESET, SCMI_PROTOCOL_RESET,
sizeof(*dom), 0, &t);
if (ret)
return ret;
dom = t->tx.buf;
dom->domain_id = cpu_to_le32(domain);
dom->flags = cpu_to_le32(flags);
dom->reset_state = cpu_to_le32(state);
if (rdom->async_reset)
ret = scmi_do_xfer_with_response(handle, t);
else
ret = scmi_do_xfer(handle, t);
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_reset_domain_reset(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, AUTONOMOUS_RESET,
ARCH_COLD_RESET);
}
static int
scmi_reset_domain_assert(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, EXPLICIT_RESET_ASSERT,
ARCH_COLD_RESET);
}
static int
scmi_reset_domain_deassert(const struct scmi_handle *handle, u32 domain)
{
return scmi_domain_reset(handle, domain, 0, ARCH_COLD_RESET);
}
static struct scmi_reset_ops reset_ops = {
.num_domains_get = scmi_reset_num_domains_get,
.name_get = scmi_reset_name_get,
.latency_get = scmi_reset_latency_get,
.reset = scmi_reset_domain_reset,
.assert = scmi_reset_domain_assert,
.deassert = scmi_reset_domain_deassert,
};
static int scmi_reset_protocol_init(struct scmi_handle *handle)
{
int domain;
u32 version;
struct scmi_reset_info *pinfo;
scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);
dev_dbg(handle->dev, "Reset Version %d.%d\n",
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
if (!pinfo)
return -ENOMEM;
scmi_reset_attributes_get(handle, pinfo);
pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
sizeof(*pinfo->dom_info), GFP_KERNEL);
if (!pinfo->dom_info)
return -ENOMEM;
for (domain = 0; domain < pinfo->num_domains; domain++) {
struct reset_dom_info *dom = pinfo->dom_info + domain;
scmi_reset_domain_attributes_get(handle, domain, dom);
}
handle->reset_ops = &reset_ops;
handle->reset_priv = pinfo;
return 0;
}
static int __init scmi_reset_init(void)
{
return scmi_protocol_register(SCMI_PROTOCOL_RESET,
&scmi_reset_protocol_init);
}
subsys_initcall(scmi_reset_init);
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