diff options
Diffstat (limited to 'drivers/firmware/arm_scmi/system.c')
| -rw-r--r-- | drivers/firmware/arm_scmi/system.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c new file mode 100644 index 0000000000..9383d75845 --- /dev/null +++ b/drivers/firmware/arm_scmi/system.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * System Control and Management Interface (SCMI) System Power Protocol + * + * Copyright (C) 2020-2022 ARM Ltd. + */ + +#define pr_fmt(fmt) "SCMI Notifications SYSTEM - " fmt + +#include <linux/module.h> +#include <linux/scmi_protocol.h> + +#include "protocols.h" +#include "notify.h" + +#define SCMI_SYSTEM_NUM_SOURCES 1 + +enum scmi_system_protocol_cmd { + SYSTEM_POWER_STATE_NOTIFY = 0x5, +}; + +struct scmi_system_power_state_notify { + __le32 notify_enable; +}; + +struct scmi_system_power_state_notifier_payld { + __le32 agent_id; + __le32 flags; + __le32 system_state; + __le32 timeout; +}; + +struct scmi_system_info { + u32 version; + bool graceful_timeout_supported; +}; + +static int scmi_system_request_notify(const struct scmi_protocol_handle *ph, + bool enable) +{ + int ret; + struct scmi_xfer *t; + struct scmi_system_power_state_notify *notify; + + ret = ph->xops->xfer_get_init(ph, SYSTEM_POWER_STATE_NOTIFY, + sizeof(*notify), 0, &t); + if (ret) + return ret; + + notify = t->tx.buf; + 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_system_set_notify_enabled(const struct scmi_protocol_handle *ph, + u8 evt_id, u32 src_id, bool enable) +{ + int ret; + + ret = scmi_system_request_notify(ph, enable); + if (ret) + pr_debug("FAIL_ENABLE - evt[%X] - ret:%d\n", evt_id, ret); + + return ret; +} + +static void * +scmi_system_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) +{ + size_t expected_sz; + const struct scmi_system_power_state_notifier_payld *p = payld; + struct scmi_system_power_state_notifier_report *r = report; + struct scmi_system_info *pinfo = ph->get_priv(ph); + + expected_sz = pinfo->graceful_timeout_supported ? + sizeof(*p) : sizeof(*p) - sizeof(__le32); + if (evt_id != SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER || + payld_sz != expected_sz) + return NULL; + + r->timestamp = timestamp; + r->agent_id = le32_to_cpu(p->agent_id); + r->flags = le32_to_cpu(p->flags); + r->system_state = le32_to_cpu(p->system_state); + if (pinfo->graceful_timeout_supported && + r->system_state == SCMI_SYSTEM_SHUTDOWN && + SCMI_SYSPOWER_IS_REQUEST_GRACEFUL(r->flags)) + r->timeout = le32_to_cpu(p->timeout); + else + r->timeout = 0x00; + *src_id = 0; + + return r; +} + +static const struct scmi_event system_events[] = { + { + .id = SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER, + .max_payld_sz = + sizeof(struct scmi_system_power_state_notifier_payld), + .max_report_sz = + sizeof(struct scmi_system_power_state_notifier_report), + }, +}; + +static const struct scmi_event_ops system_event_ops = { + .set_notify_enabled = scmi_system_set_notify_enabled, + .fill_custom_report = scmi_system_fill_custom_report, +}; + +static const struct scmi_protocol_events system_protocol_events = { + .queue_sz = SCMI_PROTO_QUEUE_SZ, + .ops = &system_event_ops, + .evts = system_events, + .num_events = ARRAY_SIZE(system_events), + .num_sources = SCMI_SYSTEM_NUM_SOURCES, +}; + +static int scmi_system_protocol_init(const struct scmi_protocol_handle *ph) +{ + int ret; + u32 version; + struct scmi_system_info *pinfo; + + ret = ph->xops->version_get(ph, &version); + if (ret) + return ret; + + dev_dbg(ph->dev, "System 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; + + pinfo->version = version; + if (PROTOCOL_REV_MAJOR(pinfo->version) >= 0x2) + pinfo->graceful_timeout_supported = true; + + return ph->set_priv(ph, pinfo); +} + +static const struct scmi_protocol scmi_system = { + .id = SCMI_PROTOCOL_SYSTEM, + .owner = THIS_MODULE, + .instance_init = &scmi_system_protocol_init, + .ops = NULL, + .events = &system_protocol_events, +}; + +DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(system, scmi_system) |