305 lines
7.1 KiB
C
305 lines
7.1 KiB
C
// 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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