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304 lines
7.1 KiB
304 lines
7.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* System Control and Management Interface (SCMI) Power Protocol |
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* |
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* Copyright (C) 2018 ARM Ltd. |
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*/ |
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#define pr_fmt(fmt) "SCMI Notifications POWER - " fmt |
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#include <linux/scmi_protocol.h> |
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#include "common.h" |
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#include "notify.h" |
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enum scmi_power_protocol_cmd { |
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POWER_DOMAIN_ATTRIBUTES = 0x3, |
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POWER_STATE_SET = 0x4, |
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POWER_STATE_GET = 0x5, |
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POWER_STATE_NOTIFY = 0x6, |
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}; |
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struct scmi_msg_resp_power_attributes { |
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__le16 num_domains; |
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__le16 reserved; |
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__le32 stats_addr_low; |
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__le32 stats_addr_high; |
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__le32 stats_size; |
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}; |
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struct scmi_msg_resp_power_domain_attributes { |
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__le32 flags; |
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#define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31)) |
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#define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30)) |
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#define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29)) |
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u8 name[SCMI_MAX_STR_SIZE]; |
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}; |
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struct scmi_power_set_state { |
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__le32 flags; |
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#define STATE_SET_ASYNC BIT(0) |
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__le32 domain; |
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__le32 state; |
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}; |
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struct scmi_power_state_notify { |
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__le32 domain; |
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__le32 notify_enable; |
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}; |
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struct scmi_power_state_notify_payld { |
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__le32 agent_id; |
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__le32 domain_id; |
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__le32 power_state; |
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}; |
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struct power_dom_info { |
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bool state_set_sync; |
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bool state_set_async; |
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bool state_set_notify; |
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char name[SCMI_MAX_STR_SIZE]; |
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}; |
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struct scmi_power_info { |
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u32 version; |
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int num_domains; |
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u64 stats_addr; |
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u32 stats_size; |
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struct power_dom_info *dom_info; |
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}; |
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static int scmi_power_attributes_get(const struct scmi_handle *handle, |
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struct scmi_power_info *pi) |
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{ |
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int ret; |
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struct scmi_xfer *t; |
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struct scmi_msg_resp_power_attributes *attr; |
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ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES, |
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SCMI_PROTOCOL_POWER, 0, sizeof(*attr), &t); |
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if (ret) |
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return ret; |
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attr = t->rx.buf; |
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ret = scmi_do_xfer(handle, t); |
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if (!ret) { |
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pi->num_domains = le16_to_cpu(attr->num_domains); |
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pi->stats_addr = le32_to_cpu(attr->stats_addr_low) | |
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(u64)le32_to_cpu(attr->stats_addr_high) << 32; |
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pi->stats_size = le32_to_cpu(attr->stats_size); |
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} |
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scmi_xfer_put(handle, t); |
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return ret; |
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} |
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static int |
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scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain, |
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struct power_dom_info *dom_info) |
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{ |
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int ret; |
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struct scmi_xfer *t; |
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struct scmi_msg_resp_power_domain_attributes *attr; |
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ret = scmi_xfer_get_init(handle, POWER_DOMAIN_ATTRIBUTES, |
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SCMI_PROTOCOL_POWER, sizeof(domain), |
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sizeof(*attr), &t); |
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if (ret) |
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return ret; |
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put_unaligned_le32(domain, t->tx.buf); |
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attr = t->rx.buf; |
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ret = scmi_do_xfer(handle, t); |
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if (!ret) { |
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u32 flags = le32_to_cpu(attr->flags); |
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dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags); |
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dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags); |
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dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags); |
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strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE); |
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} |
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scmi_xfer_put(handle, t); |
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return ret; |
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} |
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static int |
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scmi_power_state_set(const struct scmi_handle *handle, u32 domain, u32 state) |
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{ |
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int ret; |
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struct scmi_xfer *t; |
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struct scmi_power_set_state *st; |
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ret = scmi_xfer_get_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER, |
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sizeof(*st), 0, &t); |
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if (ret) |
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return ret; |
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st = t->tx.buf; |
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st->flags = cpu_to_le32(0); |
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st->domain = cpu_to_le32(domain); |
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st->state = cpu_to_le32(state); |
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ret = scmi_do_xfer(handle, t); |
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scmi_xfer_put(handle, t); |
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return ret; |
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} |
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static int |
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scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state) |
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{ |
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int ret; |
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struct scmi_xfer *t; |
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ret = scmi_xfer_get_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER, |
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sizeof(u32), sizeof(u32), &t); |
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if (ret) |
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return ret; |
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put_unaligned_le32(domain, t->tx.buf); |
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ret = scmi_do_xfer(handle, t); |
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if (!ret) |
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*state = get_unaligned_le32(t->rx.buf); |
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scmi_xfer_put(handle, t); |
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return ret; |
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} |
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static int scmi_power_num_domains_get(const struct scmi_handle *handle) |
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{ |
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struct scmi_power_info *pi = handle->power_priv; |
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return pi->num_domains; |
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} |
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static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain) |
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{ |
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struct scmi_power_info *pi = handle->power_priv; |
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struct power_dom_info *dom = pi->dom_info + domain; |
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return dom->name; |
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} |
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static const struct scmi_power_ops power_ops = { |
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.num_domains_get = scmi_power_num_domains_get, |
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.name_get = scmi_power_name_get, |
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.state_set = scmi_power_state_set, |
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.state_get = scmi_power_state_get, |
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}; |
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static int scmi_power_request_notify(const struct scmi_handle *handle, |
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u32 domain, bool enable) |
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{ |
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int ret; |
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struct scmi_xfer *t; |
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struct scmi_power_state_notify *notify; |
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ret = scmi_xfer_get_init(handle, POWER_STATE_NOTIFY, |
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SCMI_PROTOCOL_POWER, sizeof(*notify), 0, &t); |
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if (ret) |
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return ret; |
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notify = t->tx.buf; |
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notify->domain = cpu_to_le32(domain); |
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notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0; |
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ret = scmi_do_xfer(handle, t); |
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scmi_xfer_put(handle, t); |
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return ret; |
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} |
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static int scmi_power_set_notify_enabled(const struct scmi_handle *handle, |
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u8 evt_id, u32 src_id, bool enable) |
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{ |
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int ret; |
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ret = scmi_power_request_notify(handle, src_id, enable); |
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if (ret) |
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pr_debug("FAIL_ENABLE - evt[%X] dom[%d] - ret:%d\n", |
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evt_id, src_id, ret); |
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return ret; |
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} |
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static void *scmi_power_fill_custom_report(const struct scmi_handle *handle, |
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u8 evt_id, ktime_t timestamp, |
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const void *payld, size_t payld_sz, |
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void *report, u32 *src_id) |
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{ |
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const struct scmi_power_state_notify_payld *p = payld; |
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struct scmi_power_state_changed_report *r = report; |
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if (evt_id != SCMI_EVENT_POWER_STATE_CHANGED || sizeof(*p) != payld_sz) |
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return NULL; |
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r->timestamp = timestamp; |
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r->agent_id = le32_to_cpu(p->agent_id); |
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r->domain_id = le32_to_cpu(p->domain_id); |
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r->power_state = le32_to_cpu(p->power_state); |
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*src_id = r->domain_id; |
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return r; |
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} |
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static const struct scmi_event power_events[] = { |
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{ |
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.id = SCMI_EVENT_POWER_STATE_CHANGED, |
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.max_payld_sz = sizeof(struct scmi_power_state_notify_payld), |
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.max_report_sz = |
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sizeof(struct scmi_power_state_changed_report), |
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}, |
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}; |
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static const struct scmi_event_ops power_event_ops = { |
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.set_notify_enabled = scmi_power_set_notify_enabled, |
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.fill_custom_report = scmi_power_fill_custom_report, |
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}; |
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static int scmi_power_protocol_init(struct scmi_handle *handle) |
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{ |
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int domain; |
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u32 version; |
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struct scmi_power_info *pinfo; |
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scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version); |
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dev_dbg(handle->dev, "Power Version %d.%d\n", |
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PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version)); |
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pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL); |
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if (!pinfo) |
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return -ENOMEM; |
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scmi_power_attributes_get(handle, pinfo); |
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pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains, |
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sizeof(*pinfo->dom_info), GFP_KERNEL); |
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if (!pinfo->dom_info) |
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return -ENOMEM; |
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for (domain = 0; domain < pinfo->num_domains; domain++) { |
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struct power_dom_info *dom = pinfo->dom_info + domain; |
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scmi_power_domain_attributes_get(handle, domain, dom); |
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} |
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scmi_register_protocol_events(handle, |
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SCMI_PROTOCOL_POWER, SCMI_PROTO_QUEUE_SZ, |
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&power_event_ops, power_events, |
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ARRAY_SIZE(power_events), |
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pinfo->num_domains); |
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pinfo->version = version; |
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handle->power_ops = &power_ops; |
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handle->power_priv = pinfo; |
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return 0; |
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} |
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DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(SCMI_PROTOCOL_POWER, power)
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