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firmware: arm_scmi: Add SCMI v3.1 clock notifications

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Add SCMI v3.1 clock pre and post notifications.

Link: https://lore.kernel.org/r/20220330150551.2573938-20-cristian.marussi@arm.com
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2022-03-30 16:05:48 +01:00 committed by Sudeep Holla
parent 71bea05797
commit 7aa75496ea
2 changed files with 142 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

136
drivers/firmware/arm_scmi/clock.c
View file

@ -10,6 +10,7 @@
#include <linux/sort.h>
#include "protocols.h"
#include "notify.h"
enum scmi_clock_protocol_cmd {
CLOCK_ATTRIBUTES = 0x3,
@ -18,6 +19,8 @@ enum scmi_clock_protocol_cmd {
CLOCK_RATE_GET = 0x6,
CLOCK_CONFIG_SET = 0x7,
CLOCK_NAME_GET = 0x8,
CLOCK_RATE_NOTIFY = 0x9,
CLOCK_RATE_CHANGE_REQUESTED_NOTIFY = 0xA,
};
struct scmi_msg_resp_clock_protocol_attributes {
@ -29,7 +32,9 @@ struct scmi_msg_resp_clock_protocol_attributes {
struct scmi_msg_resp_clock_attributes {
__le32 attributes;
#define CLOCK_ENABLE BIT(0)
#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
#define SUPPORTS_RATE_CHANGED_NOTIF(x) ((x) & BIT(31))
#define SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(x) ((x) & BIT(30))
#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
u8 name[SCMI_SHORT_NAME_MAX_SIZE];
__le32 clock_enable_latency;
};
@ -77,6 +82,18 @@ struct scmi_msg_resp_set_rate_complete {
__le32 rate_high;
};
struct scmi_msg_clock_rate_notify {
__le32 clk_id;
__le32 notify_enable;
};
struct scmi_clock_rate_notify_payld {
__le32 agent_id;
__le32 clock_id;
__le32 rate_low;
__le32 rate_high;
};
struct clock_info {
u32 version;
int num_clocks;
@ -85,6 +102,11 @@ struct clock_info {
struct scmi_clock_info *clk;
};
static enum scmi_clock_protocol_cmd evt_2_cmd[] = {
CLOCK_RATE_NOTIFY,
CLOCK_RATE_CHANGE_REQUESTED_NOTIFY,
};
static int
scmi_clock_protocol_attributes_get(const struct scmi_protocol_handle *ph,
struct clock_info *ci)
@ -144,10 +166,17 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
* 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) >= 0x2 &&
SUPPORTS_EXTENDED_NAMES(attributes))
ph->hops->extended_name_get(ph, CLOCK_NAME_GET, clk_id,
clk->name, SCMI_MAX_STR_SIZE);
if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x2) {
if (SUPPORTS_EXTENDED_NAMES(attributes))
ph->hops->extended_name_get(ph, CLOCK_NAME_GET, clk_id,
clk->name,
SCMI_MAX_STR_SIZE);
if (SUPPORTS_RATE_CHANGED_NOTIF(attributes))
clk->rate_changed_notifications = true;
if (SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(attributes))
clk->rate_change_requested_notifications = true;
}
return ret;
}
@ -418,6 +447,102 @@ static const struct scmi_clk_proto_ops clk_proto_ops = {
.disable_atomic = scmi_clock_disable_atomic,
};
static int scmi_clk_rate_notify(const struct scmi_protocol_handle *ph,
u32 clk_id, int message_id, bool enable)
{
int ret;
struct scmi_xfer *t;
struct scmi_msg_clock_rate_notify *notify;
ret = ph->xops->xfer_get_init(ph, message_id, sizeof(*notify), 0, &t);
if (ret)
return ret;
notify = t->tx.buf;
notify->clk_id = cpu_to_le32(clk_id);
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_clk_set_notify_enabled(const struct scmi_protocol_handle *ph,
u8 evt_id, u32 src_id, bool enable)
{
int ret, cmd_id;
if (evt_id >= ARRAY_SIZE(evt_2_cmd))
return -EINVAL;
cmd_id = evt_2_cmd[evt_id];
ret = scmi_clk_rate_notify(ph, src_id, cmd_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_clk_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_clock_rate_notify_payld *p = payld;
struct scmi_clock_rate_notif_report *r = report;
if (sizeof(*p) != payld_sz ||
(evt_id != SCMI_EVENT_CLOCK_RATE_CHANGED &&
evt_id != SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED))
return NULL;
r->timestamp = timestamp;
r->agent_id = le32_to_cpu(p->agent_id);
r->clock_id = le32_to_cpu(p->clock_id);
r->rate = get_unaligned_le64(&p->rate_low);
*src_id = r->clock_id;
return r;
}
static int scmi_clk_get_num_sources(const struct scmi_protocol_handle *ph)
{
struct clock_info *ci = ph->get_priv(ph);
if (!ci)
return -EINVAL;
return ci->num_clocks;
}
static const struct scmi_event clk_events[] = {
{
.id = SCMI_EVENT_CLOCK_RATE_CHANGED,
.max_payld_sz = sizeof(struct scmi_clock_rate_notify_payld),
.max_report_sz = sizeof(struct scmi_clock_rate_notif_report),
},
{
.id = SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED,
.max_payld_sz = sizeof(struct scmi_clock_rate_notify_payld),
.max_report_sz = sizeof(struct scmi_clock_rate_notif_report),
},
};
static const struct scmi_event_ops clk_event_ops = {
.get_num_sources = scmi_clk_get_num_sources,
.set_notify_enabled = scmi_clk_set_notify_enabled,
.fill_custom_report = scmi_clk_fill_custom_report,
};
static const struct scmi_protocol_events clk_protocol_events = {
.queue_sz = SCMI_PROTO_QUEUE_SZ,
.ops = &clk_event_ops,
.evts = clk_events,
.num_events = ARRAY_SIZE(clk_events),
};
static int scmi_clock_protocol_init(const struct scmi_protocol_handle *ph)
{
u32 version;
@ -461,6 +586,7 @@ static const struct scmi_protocol scmi_clock = {
.owner = THIS_MODULE,
.instance_init = &scmi_clock_protocol_init,
.ops = &clk_proto_ops,
.events = &clk_protocol_events,
};
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(clock, scmi_clock)

11
include/linux/scmi_protocol.h
View file

@ -44,6 +44,8 @@ struct scmi_clock_info {
char name[SCMI_MAX_STR_SIZE];
unsigned int enable_latency;
bool rate_discrete;
bool rate_changed_notifications;
bool rate_change_requested_notifications;
union {
struct {
int num_rates;
@ -744,6 +746,8 @@ void scmi_protocol_unregister(const struct scmi_protocol *proto);
/* SCMI Notification API - Custom Event Reports */
enum scmi_notification_events {
SCMI_EVENT_POWER_STATE_CHANGED = 0x0,
SCMI_EVENT_CLOCK_RATE_CHANGED = 0x0,
SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED = 0x1,
SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
@ -760,6 +764,13 @@ struct scmi_power_state_changed_report {
unsigned int power_state;
};
struct scmi_clock_rate_notif_report {
ktime_t timestamp;
unsigned int agent_id;
unsigned int clock_id;
unsigned long long rate;
};
struct scmi_system_power_state_notifier_report {
ktime_t timestamp;
unsigned int agent_id;