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firmware: arm_scmi: Add reset notifications support 

Make SCMI reset protocol register with the notification core.

Link: https://lore.kernel.org/r/20200701155348.52864-9-cristian.marussi@arm.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.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 2020-07-01 16:53:47 +01:00 committed by Sudeep Holla
parent 128e3e9311
commit 469ca1822d
2 changed files with 100 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

96
drivers/firmware/arm_scmi/reset.c
View File

@ -5,7 +5,12 @@
* Copyright (C) 2019 ARM Ltd.
*/
#define pr_fmt(fmt) "SCMI Notifications RESET - " fmt
#include <linux/scmi_protocol.h>
#include "common.h"
#include "notify.h"
enum scmi_reset_protocol_cmd {
RESET_DOMAIN_ATTRIBUTES = 0x3,
@ -13,10 +18,6 @@ enum scmi_reset_protocol_cmd {
RESET_NOTIFY = 0x5,
};
enum scmi_reset_protocol_notify {
RESET_ISSUED = 0x0,
};
#define NUM_RESET_DOMAIN_MASK 0xffff
#define RESET_NOTIFY_ENABLE BIT(0)
@ -40,6 +41,18 @@ struct scmi_msg_reset_domain_reset {
#define ARCH_COLD_RESET (ARCH_RESET_TYPE | COLD_RESET_STATE)
};
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;
@ -190,6 +203,75 @@ static struct scmi_reset_ops reset_ops = {
.deassert = scmi_reset_domain_deassert,
};
static int scmi_reset_notify(const struct scmi_handle *handle, 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 = scmi_xfer_get_init(handle, RESET_NOTIFY,
SCMI_PROTOCOL_RESET, 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 = scmi_do_xfer(handle, t);
scmi_xfer_put(handle, t);
return ret;
}
static int scmi_reset_set_notify_enabled(const struct scmi_handle *handle,
u8 evt_id, u32 src_id, bool enable)
{
int ret;
ret = scmi_reset_notify(handle, 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_handle *handle,
u8 evt_id, u64 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 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 = {
.set_notify_enabled = scmi_reset_set_notify_enabled,
.fill_custom_report = scmi_reset_fill_custom_report,
};
static int scmi_reset_protocol_init(struct scmi_handle *handle)
{
int domain;
@ -218,6 +300,12 @@ static int scmi_reset_protocol_init(struct scmi_handle *handle)
scmi_reset_domain_attributes_get(handle, domain, dom);
}
scmi_register_protocol_events(handle,
SCMI_PROTOCOL_RESET, SCMI_PROTO_QUEUE_SZ,
&reset_event_ops, reset_events,
ARRAY_SIZE(reset_events),
pinfo->num_domains);
pinfo->version = version;
handle->reset_ops = &reset_ops;
handle->reset_priv = pinfo;

8
include/linux/scmi_protocol.h
View File

@ -376,6 +376,7 @@ enum scmi_notification_events {
SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED = 0x0,
SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED = 0x1,
SCMI_EVENT_SENSOR_TRIP_POINT_EVENT = 0x0,
SCMI_EVENT_RESET_ISSUED = 0x0,
};
struct scmi_power_state_changed_report {
@ -407,4 +408,11 @@ struct scmi_sensor_trip_point_report {
u32 trip_point_desc;
};
struct scmi_reset_issued_report {
u64 timestamp;
u32 agent_id;
u32 domain_id;
u32 reset_state;
};
#endif /* _LINUX_SCMI_PROTOCOL_H */