357 lines
8.5 KiB
C
357 lines
8.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* System Control and Management Interface (SCMI) Reset Protocol
|
||
|
|
*
|
||
|
|
* Copyright (C) 2019-2022 ARM Ltd.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define pr_fmt(fmt) "SCMI Notifications RESET - " fmt
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/scmi_protocol.h>
|
||
|
|
|
||
|
|
#include "protocols.h"
|
||
|
|
#include "notify.h"
|
||
|
|
|
||
|
|
enum scmi_reset_protocol_cmd {
|
||
|
|
RESET_DOMAIN_ATTRIBUTES = 0x3,
|
||
|
|
RESET = 0x4,
|
||
|
|
RESET_NOTIFY = 0x5,
|
||
|
|
RESET_DOMAIN_NAME_GET = 0x6,
|
||
|
|
};
|
||
|
|
|
||
|
|
#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))
|
||
|
|
#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
|
||
|
|
__le32 latency;
|
||
|
|
u8 name[SCMI_SHORT_NAME_MAX_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_COLD_RESET 0
|
||
|
|
};
|
||
|
|
|
||
|
|
struct scmi_msg_reset_notify {
|
||
|
|
__le32 id;
|
||
|
|
__le32 event_control;
|
||
|
|
#define RESET_TP_NOTIFY_ALL BIT(0)
|
||
|
|
};
|
||
|
|
|
||
|
|
struct scmi_reset_issued_notify_payld {
|
||
|
|
__le32 agent_id;
|
||
|
|
__le32 domain_id;
|
||
|
|
__le32 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 {
|
||
|
|
u32 version;
|
||
|
|
int num_domains;
|
||
|
|
struct reset_dom_info *dom_info;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
|
||
|
|
struct scmi_reset_info *pi)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
u32 attr;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
|
||
|
|
0, sizeof(attr), &t);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
if (!ret) {
|
||
|
|
attr = get_unaligned_le32(t->rx.buf);
|
||
|
|
pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
|
||
|
|
}
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 domain, struct reset_dom_info *dom_info,
|
||
|
|
u32 version)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
u32 attributes;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
struct scmi_msg_resp_reset_domain_attributes *attr;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, RESET_DOMAIN_ATTRIBUTES,
|
||
|
|
sizeof(domain), sizeof(*attr), &t);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
put_unaligned_le32(domain, t->tx.buf);
|
||
|
|
attr = t->rx.buf;
|
||
|
|
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
if (!ret) {
|
||
|
|
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;
|
||
|
|
strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If supported overwrite short name with the extended one;
|
||
|
|
* on error just carry on and use already provided short name.
|
||
|
|
*/
|
||
|
|
if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
|
||
|
|
SUPPORTS_EXTENDED_NAMES(attributes))
|
||
|
|
ph->hops->extended_name_get(ph, RESET_DOMAIN_NAME_GET, domain,
|
||
|
|
dom_info->name, SCMI_MAX_STR_SIZE);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_reset_num_domains_get(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
struct scmi_reset_info *pi = ph->get_priv(ph);
|
||
|
|
|
||
|
|
return pi->num_domains;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const char *
|
||
|
|
scmi_reset_name_get(const struct scmi_protocol_handle *ph, u32 domain)
|
||
|
|
{
|
||
|
|
struct scmi_reset_info *pi = ph->get_priv(ph);
|
||
|
|
|
||
|
|
struct reset_dom_info *dom = pi->dom_info + domain;
|
||
|
|
|
||
|
|
return dom->name;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_reset_latency_get(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 domain)
|
||
|
|
{
|
||
|
|
struct scmi_reset_info *pi = ph->get_priv(ph);
|
||
|
|
struct reset_dom_info *dom = pi->dom_info + domain;
|
||
|
|
|
||
|
|
return dom->latency_us;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
|
||
|
|
u32 flags, u32 state)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
struct scmi_msg_reset_domain_reset *dom;
|
||
|
|
struct scmi_reset_info *pi = ph->get_priv(ph);
|
||
|
|
struct reset_dom_info *rdom;
|
||
|
|
|
||
|
|
if (domain >= pi->num_domains)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
rdom = pi->dom_info + domain;
|
||
|
|
if (rdom->async_reset && flags & AUTONOMOUS_RESET)
|
||
|
|
flags |= ASYNCHRONOUS_RESET;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, 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 (flags & ASYNCHRONOUS_RESET)
|
||
|
|
ret = ph->xops->do_xfer_with_response(ph, t);
|
||
|
|
else
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_reset_domain_reset(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 domain)
|
||
|
|
{
|
||
|
|
return scmi_domain_reset(ph, domain, AUTONOMOUS_RESET,
|
||
|
|
ARCH_COLD_RESET);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
scmi_reset_domain_assert(const struct scmi_protocol_handle *ph, u32 domain)
|
||
|
|
{
|
||
|
|
return scmi_domain_reset(ph, domain, EXPLICIT_RESET_ASSERT,
|
||
|
|
ARCH_COLD_RESET);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
scmi_reset_domain_deassert(const struct scmi_protocol_handle *ph, u32 domain)
|
||
|
|
{
|
||
|
|
return scmi_domain_reset(ph, domain, 0, ARCH_COLD_RESET);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_reset_proto_ops reset_proto_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_notify(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 domain_id, bool enable)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
struct scmi_msg_reset_notify *cfg;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, RESET_NOTIFY, sizeof(*cfg), 0, &t);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
cfg = t->tx.buf;
|
||
|
|
cfg->id = cpu_to_le32(domain_id);
|
||
|
|
cfg->event_control = cpu_to_le32(evt_cntl);
|
||
|
|
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_reset_set_notify_enabled(const struct scmi_protocol_handle *ph,
|
||
|
|
u8 evt_id, u32 src_id, bool enable)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = scmi_reset_notify(ph, src_id, enable);
|
||
|
|
if (ret)
|
||
|
|
pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
|
||
|
|
evt_id, src_id, ret);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void *
|
||
|
|
scmi_reset_fill_custom_report(const struct scmi_protocol_handle *ph,
|
||
|
|
u8 evt_id, ktime_t timestamp,
|
||
|
|
const void *payld, size_t payld_sz,
|
||
|
|
void *report, u32 *src_id)
|
||
|
|
{
|
||
|
|
const struct scmi_reset_issued_notify_payld *p = payld;
|
||
|
|
struct scmi_reset_issued_report *r = report;
|
||
|
|
|
||
|
|
if (evt_id != SCMI_EVENT_RESET_ISSUED || sizeof(*p) != payld_sz)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
r->timestamp = timestamp;
|
||
|
|
r->agent_id = le32_to_cpu(p->agent_id);
|
||
|
|
r->domain_id = le32_to_cpu(p->domain_id);
|
||
|
|
r->reset_state = le32_to_cpu(p->reset_state);
|
||
|
|
*src_id = r->domain_id;
|
||
|
|
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_reset_get_num_sources(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
struct scmi_reset_info *pinfo = ph->get_priv(ph);
|
||
|
|
|
||
|
|
if (!pinfo)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return pinfo->num_domains;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_event reset_events[] = {
|
||
|
|
{
|
||
|
|
.id = SCMI_EVENT_RESET_ISSUED,
|
||
|
|
.max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
|
||
|
|
.max_report_sz = sizeof(struct scmi_reset_issued_report),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct scmi_event_ops reset_event_ops = {
|
||
|
|
.get_num_sources = scmi_reset_get_num_sources,
|
||
|
|
.set_notify_enabled = scmi_reset_set_notify_enabled,
|
||
|
|
.fill_custom_report = scmi_reset_fill_custom_report,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct scmi_protocol_events reset_protocol_events = {
|
||
|
|
.queue_sz = SCMI_PROTO_QUEUE_SZ,
|
||
|
|
.ops = &reset_event_ops,
|
||
|
|
.evts = reset_events,
|
||
|
|
.num_events = ARRAY_SIZE(reset_events),
|
||
|
|
};
|
||
|
|
|
||
|
|
static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
int domain, ret;
|
||
|
|
u32 version;
|
||
|
|
struct scmi_reset_info *pinfo;
|
||
|
|
|
||
|
|
ret = ph->xops->version_get(ph, &version);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
dev_dbg(ph->dev, "Reset Version %d.%d\n",
|
||
|
|
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
|
||
|
|
|
||
|
|
pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
|
||
|
|
if (!pinfo)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ret = scmi_reset_attributes_get(ph, pinfo);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
pinfo->dom_info = devm_kcalloc(ph->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(ph, domain, dom, version);
|
||
|
|
}
|
||
|
|
|
||
|
|
pinfo->version = version;
|
||
|
|
return ph->set_priv(ph, pinfo);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_protocol scmi_reset = {
|
||
|
|
.id = SCMI_PROTOCOL_RESET,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.instance_init = &scmi_reset_protocol_init,
|
||
|
|
.ops = &reset_proto_ops,
|
||
|
|
.events = &reset_protocol_events,
|
||
|
|
};
|
||
|
|
|
||
|
|
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(reset, scmi_reset)
|