315 lines
7.5 KiB
C
315 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) Reset Protocol
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*
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* Copyright (C) 2019 ARM Ltd.
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*/
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#define pr_fmt(fmt) "SCMI Notifications RESET - " 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_reset_protocol_cmd {
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RESET_DOMAIN_ATTRIBUTES = 0x3,
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RESET = 0x4,
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RESET_NOTIFY = 0x5,
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};
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#define NUM_RESET_DOMAIN_MASK 0xffff
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#define RESET_NOTIFY_ENABLE BIT(0)
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struct scmi_msg_resp_reset_domain_attributes {
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__le32 attributes;
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#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
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#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
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__le32 latency;
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u8 name[SCMI_MAX_STR_SIZE];
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};
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struct scmi_msg_reset_domain_reset {
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__le32 domain_id;
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__le32 flags;
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#define AUTONOMOUS_RESET BIT(0)
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#define EXPLICIT_RESET_ASSERT BIT(1)
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#define ASYNCHRONOUS_RESET BIT(2)
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__le32 reset_state;
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#define ARCH_COLD_RESET 0
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};
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struct scmi_msg_reset_notify {
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__le32 id;
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__le32 event_control;
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#define RESET_TP_NOTIFY_ALL BIT(0)
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};
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struct scmi_reset_issued_notify_payld {
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__le32 agent_id;
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__le32 domain_id;
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__le32 reset_state;
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};
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struct reset_dom_info {
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bool async_reset;
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bool reset_notify;
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u32 latency_us;
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char name[SCMI_MAX_STR_SIZE];
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};
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struct scmi_reset_info {
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u32 version;
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int num_domains;
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struct reset_dom_info *dom_info;
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};
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static int scmi_reset_attributes_get(const struct scmi_handle *handle,
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struct scmi_reset_info *pi)
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{
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int ret;
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struct scmi_xfer *t;
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u32 attr;
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ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
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SCMI_PROTOCOL_RESET, 0, sizeof(attr), &t);
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if (ret)
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return ret;
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ret = scmi_do_xfer(handle, t);
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if (!ret) {
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attr = get_unaligned_le32(t->rx.buf);
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pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
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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_reset_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
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struct reset_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_reset_domain_attributes *attr;
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ret = scmi_xfer_get_init(handle, RESET_DOMAIN_ATTRIBUTES,
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SCMI_PROTOCOL_RESET, 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 attributes = le32_to_cpu(attr->attributes);
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dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
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dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
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dom_info->latency_us = le32_to_cpu(attr->latency);
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if (dom_info->latency_us == U32_MAX)
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dom_info->latency_us = 0;
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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 scmi_reset_num_domains_get(const struct scmi_handle *handle)
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{
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struct scmi_reset_info *pi = handle->reset_priv;
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return pi->num_domains;
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}
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static char *scmi_reset_name_get(const struct scmi_handle *handle, u32 domain)
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{
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struct scmi_reset_info *pi = handle->reset_priv;
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struct reset_dom_info *dom = pi->dom_info + domain;
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return dom->name;
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}
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static int scmi_reset_latency_get(const struct scmi_handle *handle, u32 domain)
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{
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struct scmi_reset_info *pi = handle->reset_priv;
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struct reset_dom_info *dom = pi->dom_info + domain;
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return dom->latency_us;
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}
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static int scmi_domain_reset(const struct scmi_handle *handle, u32 domain,
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u32 flags, 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_msg_reset_domain_reset *dom;
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struct scmi_reset_info *pi = handle->reset_priv;
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struct reset_dom_info *rdom = pi->dom_info + domain;
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if (rdom->async_reset)
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flags |= ASYNCHRONOUS_RESET;
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ret = scmi_xfer_get_init(handle, RESET, SCMI_PROTOCOL_RESET,
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sizeof(*dom), 0, &t);
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if (ret)
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return ret;
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dom = t->tx.buf;
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dom->domain_id = cpu_to_le32(domain);
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dom->flags = cpu_to_le32(flags);
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dom->reset_state = cpu_to_le32(state);
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if (rdom->async_reset)
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ret = scmi_do_xfer_with_response(handle, t);
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else
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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_reset_domain_reset(const struct scmi_handle *handle, u32 domain)
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{
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return scmi_domain_reset(handle, domain, AUTONOMOUS_RESET,
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ARCH_COLD_RESET);
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}
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static int
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scmi_reset_domain_assert(const struct scmi_handle *handle, u32 domain)
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{
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return scmi_domain_reset(handle, domain, EXPLICIT_RESET_ASSERT,
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ARCH_COLD_RESET);
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}
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static int
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scmi_reset_domain_deassert(const struct scmi_handle *handle, u32 domain)
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{
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return scmi_domain_reset(handle, domain, 0, ARCH_COLD_RESET);
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}
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static const struct scmi_reset_ops reset_ops = {
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.num_domains_get = scmi_reset_num_domains_get,
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.name_get = scmi_reset_name_get,
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.latency_get = scmi_reset_latency_get,
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.reset = scmi_reset_domain_reset,
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.assert = scmi_reset_domain_assert,
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.deassert = scmi_reset_domain_deassert,
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};
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static int scmi_reset_notify(const struct scmi_handle *handle, u32 domain_id,
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bool enable)
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{
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int ret;
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u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
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struct scmi_xfer *t;
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struct scmi_msg_reset_notify *cfg;
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ret = scmi_xfer_get_init(handle, RESET_NOTIFY,
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SCMI_PROTOCOL_RESET, sizeof(*cfg), 0, &t);
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if (ret)
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return ret;
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cfg = t->tx.buf;
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cfg->id = cpu_to_le32(domain_id);
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cfg->event_control = cpu_to_le32(evt_cntl);
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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_reset_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_reset_notify(handle, src_id, enable);
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if (ret)
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pr_debug("FAIL_ENABLED - 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_reset_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_reset_issued_notify_payld *p = payld;
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struct scmi_reset_issued_report *r = report;
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if (evt_id != SCMI_EVENT_RESET_ISSUED || 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->reset_state = le32_to_cpu(p->reset_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 reset_events[] = {
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{
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.id = SCMI_EVENT_RESET_ISSUED,
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.max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
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.max_report_sz = sizeof(struct scmi_reset_issued_report),
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},
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};
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static const struct scmi_event_ops reset_event_ops = {
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.set_notify_enabled = scmi_reset_set_notify_enabled,
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.fill_custom_report = scmi_reset_fill_custom_report,
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};
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static int scmi_reset_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_reset_info *pinfo;
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scmi_version_get(handle, SCMI_PROTOCOL_RESET, &version);
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dev_dbg(handle->dev, "Reset 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_reset_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 reset_dom_info *dom = pinfo->dom_info + domain;
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scmi_reset_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_RESET, SCMI_PROTO_QUEUE_SZ,
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&reset_event_ops, reset_events,
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ARRAY_SIZE(reset_events),
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pinfo->num_domains);
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pinfo->version = version;
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handle->reset_ops = &reset_ops;
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handle->reset_priv = pinfo;
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return 0;
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}
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DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(SCMI_PROTOCOL_RESET, reset)
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