230 строки
5.1 KiB
C
230 строки
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* System Control and Management Interface (SCMI) Power Protocol
|
|
*
|
|
* Copyright (C) 2018 ARM Ltd.
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
enum scmi_power_protocol_cmd {
|
|
POWER_DOMAIN_ATTRIBUTES = 0x3,
|
|
POWER_STATE_SET = 0x4,
|
|
POWER_STATE_GET = 0x5,
|
|
POWER_STATE_NOTIFY = 0x6,
|
|
POWER_STATE_CHANGE_REQUESTED_NOTIFY = 0x7,
|
|
};
|
|
|
|
enum scmi_power_protocol_notify {
|
|
POWER_STATE_CHANGED = 0x0,
|
|
POWER_STATE_CHANGE_REQUESTED = 0x1,
|
|
};
|
|
|
|
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 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_handle *handle,
|
|
struct scmi_power_info *pi)
|
|
{
|
|
int ret;
|
|
struct scmi_xfer *t;
|
|
struct scmi_msg_resp_power_attributes *attr;
|
|
|
|
ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
|
|
SCMI_PROTOCOL_POWER, 0, sizeof(*attr), &t);
|
|
if (ret)
|
|
return ret;
|
|
|
|
attr = t->rx.buf;
|
|
|
|
ret = scmi_do_xfer(handle, 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);
|
|
}
|
|
|
|
scmi_xfer_put(handle, t);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
|
|
struct power_dom_info *dom_info)
|
|
{
|
|
int ret;
|
|
struct scmi_xfer *t;
|
|
struct scmi_msg_resp_power_domain_attributes *attr;
|
|
|
|
ret = scmi_xfer_get_init(handle, POWER_DOMAIN_ATTRIBUTES,
|
|
SCMI_PROTOCOL_POWER, 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 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);
|
|
}
|
|
|
|
scmi_xfer_put(handle, t);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
scmi_power_state_set(const struct scmi_handle *handle, u32 domain, u32 state)
|
|
{
|
|
int ret;
|
|
struct scmi_xfer *t;
|
|
struct scmi_power_set_state *st;
|
|
|
|
ret = scmi_xfer_get_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER,
|
|
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 = scmi_do_xfer(handle, t);
|
|
|
|
scmi_xfer_put(handle, t);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
|
|
{
|
|
int ret;
|
|
struct scmi_xfer *t;
|
|
|
|
ret = scmi_xfer_get_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER,
|
|
sizeof(u32), sizeof(u32), &t);
|
|
if (ret)
|
|
return ret;
|
|
|
|
put_unaligned_le32(domain, t->tx.buf);
|
|
|
|
ret = scmi_do_xfer(handle, t);
|
|
if (!ret)
|
|
*state = get_unaligned_le32(t->rx.buf);
|
|
|
|
scmi_xfer_put(handle, t);
|
|
return ret;
|
|
}
|
|
|
|
static int scmi_power_num_domains_get(const struct scmi_handle *handle)
|
|
{
|
|
struct scmi_power_info *pi = handle->power_priv;
|
|
|
|
return pi->num_domains;
|
|
}
|
|
|
|
static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain)
|
|
{
|
|
struct scmi_power_info *pi = handle->power_priv;
|
|
struct power_dom_info *dom = pi->dom_info + domain;
|
|
|
|
return dom->name;
|
|
}
|
|
|
|
static struct scmi_power_ops power_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_protocol_init(struct scmi_handle *handle)
|
|
{
|
|
int domain;
|
|
u32 version;
|
|
struct scmi_power_info *pinfo;
|
|
|
|
scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version);
|
|
|
|
dev_dbg(handle->dev, "Power 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_power_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 power_dom_info *dom = pinfo->dom_info + domain;
|
|
|
|
scmi_power_domain_attributes_get(handle, domain, dom);
|
|
}
|
|
|
|
pinfo->version = version;
|
|
handle->power_ops = &power_ops;
|
|
handle->power_priv = pinfo;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init scmi_power_init(void)
|
|
{
|
|
return scmi_protocol_register(SCMI_PROTOCOL_POWER,
|
|
&scmi_power_protocol_init);
|
|
}
|
|
subsys_initcall(scmi_power_init);
|