https://github.com/torvalds/linux
Tip revision: a7904a538933c525096ca2ccde1e60d0ee62c08e authored by Linus Torvalds on 19 December 2021, 22:14:33 UTC
Linux 5.16-rc6
Linux 5.16-rc6
Tip revision: a7904a5
power.c
// SPDX-License-Identifier: GPL-2.0
/*
* System Control and Management Interface (SCMI) Power Protocol
*
* Copyright (C) 2018-2021 ARM Ltd.
*/
#define pr_fmt(fmt) "SCMI Notifications POWER - " fmt
#include <linux/module.h>
#include <linux/scmi_protocol.h>
#include "common.h"
#include "notify.h"
enum scmi_power_protocol_cmd {
POWER_DOMAIN_ATTRIBUTES = 0x3,
POWER_STATE_SET = 0x4,
POWER_STATE_GET = 0x5,
POWER_STATE_NOTIFY = 0x6,
};
struct scmi_msg_resp_power_attributes {
__le16 num_domains;
__le16 reserved;
__le32 stats_addr_low;
__le32 stats_addr_high;
__le32 stats_size;
};
struct scmi_msg_resp_power_domain_attributes {
__le32 flags;
#define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
#define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
#define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
u8 name[SCMI_MAX_STR_SIZE];
};
struct scmi_power_set_state {
__le32 flags;
#define STATE_SET_ASYNC BIT(0)
__le32 domain;
__le32 state;
};
struct scmi_power_state_notify {
__le32 domain;
__le32 notify_enable;
};
struct scmi_power_state_notify_payld {
__le32 agent_id;
__le32 domain_id;
__le32 power_state;
};
struct power_dom_info {
bool state_set_sync;
bool state_set_async;
bool state_set_notify;
char name[SCMI_MAX_STR_SIZE];
};
struct scmi_power_info {
u32 version;
int num_domains;
u64 stats_addr;
u32 stats_size;
struct power_dom_info *dom_info;
};
static int scmi_power_attributes_get(const struct scmi_protocol_handle *ph,
struct scmi_power_info *pi)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_resp_power_attributes *attr;
ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
0, sizeof(*attr), &t);
if (ret)
return ret;
attr = t->rx.buf;
ret = ph->xops->do_xfer(ph, t);
if (!ret) {
pi->num_domains = le16_to_cpu(attr->num_domains);
pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
(u64)le32_to_cpu(attr->stats_addr_high) << 32;
pi->stats_size = le32_to_cpu(attr->stats_size);
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int
scmi_power_domain_attributes_get(const struct scmi_protocol_handle *ph,
u32 domain, struct power_dom_info *dom_info)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_resp_power_domain_attributes *attr;
ret = ph->xops->xfer_get_init(ph, POWER_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) {
u32 flags = le32_to_cpu(attr->flags);
dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
}
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_power_state_set(const struct scmi_protocol_handle *ph,
u32 domain, u32 state)
{
int ret;
struct scmi_xfer *t;
struct scmi_power_set_state *st;
ret = ph->xops->xfer_get_init(ph, POWER_STATE_SET, sizeof(*st), 0, &t);
if (ret)
return ret;
st = t->tx.buf;
st->flags = cpu_to_le32(0);
st->domain = cpu_to_le32(domain);
st->state = cpu_to_le32(state);
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_power_state_get(const struct scmi_protocol_handle *ph,
u32 domain, u32 *state)
{
int ret;
struct scmi_xfer *t;
ret = ph->xops->xfer_get_init(ph, POWER_STATE_GET, sizeof(u32), sizeof(u32), &t);
if (ret)
return ret;
put_unaligned_le32(domain, t->tx.buf);
ret = ph->xops->do_xfer(ph, t);
if (!ret)
*state = get_unaligned_le32(t->rx.buf);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_power_num_domains_get(const struct scmi_protocol_handle *ph)
{
struct scmi_power_info *pi = ph->get_priv(ph);
return pi->num_domains;
}
static char *scmi_power_name_get(const struct scmi_protocol_handle *ph,
u32 domain)
{
struct scmi_power_info *pi = ph->get_priv(ph);
struct power_dom_info *dom = pi->dom_info + domain;
return dom->name;
}
static const struct scmi_power_proto_ops power_proto_ops = {
.num_domains_get = scmi_power_num_domains_get,
.name_get = scmi_power_name_get,
.state_set = scmi_power_state_set,
.state_get = scmi_power_state_get,
};
static int scmi_power_request_notify(const struct scmi_protocol_handle *ph,
u32 domain, bool enable)
{
int ret;
struct scmi_xfer *t;
struct scmi_power_state_notify *notify;
ret = ph->xops->xfer_get_init(ph, POWER_STATE_NOTIFY,
sizeof(*notify), 0, &t);
if (ret)
return ret;
notify = t->tx.buf;
notify->domain = cpu_to_le32(domain);
notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
ret = ph->xops->do_xfer(ph, t);
ph->xops->xfer_put(ph, t);
return ret;
}
static int scmi_power_set_notify_enabled(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id, bool enable)
{
int ret;
ret = scmi_power_request_notify(ph, src_id, enable);
if (ret)
pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n",
evt_id, src_id, ret);
return ret;
}
static void *
scmi_power_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_power_state_notify_payld *p = payld;
struct scmi_power_state_changed_report *r = report;
if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || 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->power_state = le32_to_cpu(p->power_state);
*src_id = r->domain_id;
return r;
}
static int scmi_power_get_num_sources(const struct scmi_protocol_handle *ph)
{
struct scmi_power_info *pinfo = ph->get_priv(ph);
if (!pinfo)
return -EINVAL;
return pinfo->num_domains;
}
static const struct scmi_event power_events[] = {
{
.id = SCMI_EVENT_POWER_STATE_CHANGED,
.max_payld_sz = sizeof(struct scmi_power_state_notify_payld),
.max_report_sz =
sizeof(struct scmi_power_state_changed_report),
},
};
static const struct scmi_event_ops power_event_ops = {
.get_num_sources = scmi_power_get_num_sources,
.set_notify_enabled = scmi_power_set_notify_enabled,
.fill_custom_report = scmi_power_fill_custom_report,
};
static const struct scmi_protocol_events power_protocol_events = {
.queue_sz = SCMI_PROTO_QUEUE_SZ,
.ops = &power_event_ops,
.evts = power_events,
.num_events = ARRAY_SIZE(power_events),
};
static int scmi_power_protocol_init(const struct scmi_protocol_handle *ph)
{
int domain;
u32 version;
struct scmi_power_info *pinfo;
ph->xops->version_get(ph, &version);
dev_dbg(ph->dev, "Power 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;
scmi_power_attributes_get(ph, pinfo);
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 power_dom_info *dom = pinfo->dom_info + domain;
scmi_power_domain_attributes_get(ph, domain, dom);
}
pinfo->version = version;
return ph->set_priv(ph, pinfo);
}
static const struct scmi_protocol scmi_power = {
.id = SCMI_PROTOCOL_POWER,
.owner = THIS_MODULE,
.instance_init = &scmi_power_protocol_init,
.ops = &power_proto_ops,
.events = &power_protocol_events,
};
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(power, scmi_power)