620 lines
15 KiB
C
620 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* System Control and Management Interface (SCMI) Clock Protocol
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*
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* Copyright (C) 2018-2022 ARM Ltd.
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*/
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#include <linux/module.h>
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#include <linux/limits.h>
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#include <linux/sort.h>
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#include "protocols.h"
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#include "notify.h"
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enum scmi_clock_protocol_cmd {
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CLOCK_ATTRIBUTES = 0x3,
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CLOCK_DESCRIBE_RATES = 0x4,
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CLOCK_RATE_SET = 0x5,
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CLOCK_RATE_GET = 0x6,
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CLOCK_CONFIG_SET = 0x7,
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CLOCK_NAME_GET = 0x8,
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CLOCK_RATE_NOTIFY = 0x9,
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CLOCK_RATE_CHANGE_REQUESTED_NOTIFY = 0xA,
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};
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struct scmi_msg_resp_clock_protocol_attributes {
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__le16 num_clocks;
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u8 max_async_req;
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u8 reserved;
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};
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struct scmi_msg_resp_clock_attributes {
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__le32 attributes;
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#define CLOCK_ENABLE BIT(0)
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#define SUPPORTS_RATE_CHANGED_NOTIF(x) ((x) & BIT(31))
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#define SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(x) ((x) & BIT(30))
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#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
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u8 name[SCMI_SHORT_NAME_MAX_SIZE];
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__le32 clock_enable_latency;
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};
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struct scmi_clock_set_config {
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__le32 id;
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__le32 attributes;
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};
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struct scmi_msg_clock_describe_rates {
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__le32 id;
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__le32 rate_index;
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};
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struct scmi_msg_resp_clock_describe_rates {
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__le32 num_rates_flags;
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#define NUM_RETURNED(x) ((x) & 0xfff)
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#define RATE_DISCRETE(x) !((x) & BIT(12))
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#define NUM_REMAINING(x) ((x) >> 16)
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struct {
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__le32 value_low;
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__le32 value_high;
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} rate[];
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#define RATE_TO_U64(X) \
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({ \
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typeof(X) x = (X); \
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le32_to_cpu((x).value_low) | (u64)le32_to_cpu((x).value_high) << 32; \
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})
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};
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struct scmi_clock_set_rate {
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__le32 flags;
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#define CLOCK_SET_ASYNC BIT(0)
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#define CLOCK_SET_IGNORE_RESP BIT(1)
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#define CLOCK_SET_ROUND_UP BIT(2)
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#define CLOCK_SET_ROUND_AUTO BIT(3)
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__le32 id;
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__le32 value_low;
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__le32 value_high;
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};
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struct scmi_msg_resp_set_rate_complete {
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__le32 id;
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__le32 rate_low;
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__le32 rate_high;
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};
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struct scmi_msg_clock_rate_notify {
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__le32 clk_id;
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__le32 notify_enable;
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};
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struct scmi_clock_rate_notify_payld {
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__le32 agent_id;
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__le32 clock_id;
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__le32 rate_low;
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__le32 rate_high;
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};
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struct clock_info {
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u32 version;
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int num_clocks;
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int max_async_req;
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atomic_t cur_async_req;
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struct scmi_clock_info *clk;
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};
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static enum scmi_clock_protocol_cmd evt_2_cmd[] = {
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CLOCK_RATE_NOTIFY,
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CLOCK_RATE_CHANGE_REQUESTED_NOTIFY,
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};
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static int
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scmi_clock_protocol_attributes_get(const struct scmi_protocol_handle *ph,
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struct clock_info *ci)
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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_clock_protocol_attributes *attr;
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ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
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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 = ph->xops->do_xfer(ph, t);
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if (!ret) {
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ci->num_clocks = le16_to_cpu(attr->num_clocks);
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ci->max_async_req = attr->max_async_req;
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}
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ph->xops->xfer_put(ph, t);
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return ret;
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}
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static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
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u32 clk_id, struct scmi_clock_info *clk,
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u32 version)
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{
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int ret;
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u32 attributes;
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struct scmi_xfer *t;
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struct scmi_msg_resp_clock_attributes *attr;
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ret = ph->xops->xfer_get_init(ph, CLOCK_ATTRIBUTES,
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sizeof(clk_id), sizeof(*attr), &t);
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if (ret)
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return ret;
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put_unaligned_le32(clk_id, t->tx.buf);
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attr = t->rx.buf;
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ret = ph->xops->do_xfer(ph, t);
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if (!ret) {
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u32 latency = 0;
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attributes = le32_to_cpu(attr->attributes);
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strscpy(clk->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
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/* clock_enable_latency field is present only since SCMI v3.1 */
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if (PROTOCOL_REV_MAJOR(version) >= 0x2)
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latency = le32_to_cpu(attr->clock_enable_latency);
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clk->enable_latency = latency ? : U32_MAX;
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}
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ph->xops->xfer_put(ph, t);
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/*
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* If supported overwrite short name with the extended one;
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* on error just carry on and use already provided short name.
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*/
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if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x2) {
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if (SUPPORTS_EXTENDED_NAMES(attributes))
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ph->hops->extended_name_get(ph, CLOCK_NAME_GET, clk_id,
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clk->name,
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SCMI_MAX_STR_SIZE);
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if (SUPPORTS_RATE_CHANGED_NOTIF(attributes))
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clk->rate_changed_notifications = true;
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if (SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(attributes))
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clk->rate_change_requested_notifications = true;
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}
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return ret;
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}
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static int rate_cmp_func(const void *_r1, const void *_r2)
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{
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const u64 *r1 = _r1, *r2 = _r2;
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if (*r1 < *r2)
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return -1;
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else if (*r1 == *r2)
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return 0;
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else
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return 1;
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}
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struct scmi_clk_ipriv {
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struct device *dev;
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u32 clk_id;
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struct scmi_clock_info *clk;
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};
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static void iter_clk_describe_prepare_message(void *message,
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const unsigned int desc_index,
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const void *priv)
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{
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struct scmi_msg_clock_describe_rates *msg = message;
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const struct scmi_clk_ipriv *p = priv;
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msg->id = cpu_to_le32(p->clk_id);
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/* Set the number of rates to be skipped/already read */
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msg->rate_index = cpu_to_le32(desc_index);
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}
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static int
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iter_clk_describe_update_state(struct scmi_iterator_state *st,
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const void *response, void *priv)
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{
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u32 flags;
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struct scmi_clk_ipriv *p = priv;
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const struct scmi_msg_resp_clock_describe_rates *r = response;
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flags = le32_to_cpu(r->num_rates_flags);
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st->num_remaining = NUM_REMAINING(flags);
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st->num_returned = NUM_RETURNED(flags);
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p->clk->rate_discrete = RATE_DISCRETE(flags);
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/* Warn about out of spec replies ... */
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if (!p->clk->rate_discrete &&
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(st->num_returned != 3 || st->num_remaining != 0)) {
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dev_warn(p->dev,
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"Out-of-spec CLOCK_DESCRIBE_RATES reply for %s - returned:%d remaining:%d rx_len:%zd\n",
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p->clk->name, st->num_returned, st->num_remaining,
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st->rx_len);
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/*
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* A known quirk: a triplet is returned but num_returned != 3
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* Check for a safe payload size and fix.
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*/
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if (st->num_returned != 3 && st->num_remaining == 0 &&
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st->rx_len == sizeof(*r) + sizeof(__le32) * 2 * 3) {
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st->num_returned = 3;
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st->num_remaining = 0;
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} else {
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dev_err(p->dev,
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"Cannot fix out-of-spec reply !\n");
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return -EPROTO;
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}
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}
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return 0;
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}
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static int
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iter_clk_describe_process_response(const struct scmi_protocol_handle *ph,
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const void *response,
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struct scmi_iterator_state *st, void *priv)
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{
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int ret = 0;
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struct scmi_clk_ipriv *p = priv;
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const struct scmi_msg_resp_clock_describe_rates *r = response;
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if (!p->clk->rate_discrete) {
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switch (st->desc_index + st->loop_idx) {
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case 0:
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p->clk->range.min_rate = RATE_TO_U64(r->rate[0]);
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break;
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case 1:
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p->clk->range.max_rate = RATE_TO_U64(r->rate[1]);
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break;
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case 2:
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p->clk->range.step_size = RATE_TO_U64(r->rate[2]);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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} else {
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u64 *rate = &p->clk->list.rates[st->desc_index + st->loop_idx];
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*rate = RATE_TO_U64(r->rate[st->loop_idx]);
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p->clk->list.num_rates++;
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}
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return ret;
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}
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static int
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scmi_clock_describe_rates_get(const struct scmi_protocol_handle *ph, u32 clk_id,
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struct scmi_clock_info *clk)
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{
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int ret;
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void *iter;
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struct scmi_iterator_ops ops = {
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.prepare_message = iter_clk_describe_prepare_message,
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.update_state = iter_clk_describe_update_state,
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.process_response = iter_clk_describe_process_response,
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};
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struct scmi_clk_ipriv cpriv = {
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.clk_id = clk_id,
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.clk = clk,
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.dev = ph->dev,
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};
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iter = ph->hops->iter_response_init(ph, &ops, SCMI_MAX_NUM_RATES,
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CLOCK_DESCRIBE_RATES,
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sizeof(struct scmi_msg_clock_describe_rates),
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&cpriv);
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if (IS_ERR(iter))
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return PTR_ERR(iter);
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ret = ph->hops->iter_response_run(iter);
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if (ret)
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return ret;
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if (!clk->rate_discrete) {
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dev_dbg(ph->dev, "Min %llu Max %llu Step %llu Hz\n",
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clk->range.min_rate, clk->range.max_rate,
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clk->range.step_size);
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} else if (clk->list.num_rates) {
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sort(clk->list.rates, clk->list.num_rates,
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sizeof(clk->list.rates[0]), rate_cmp_func, NULL);
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}
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return ret;
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}
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static int
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scmi_clock_rate_get(const struct scmi_protocol_handle *ph,
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u32 clk_id, u64 *value)
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{
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int ret;
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struct scmi_xfer *t;
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ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_GET,
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sizeof(__le32), sizeof(u64), &t);
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if (ret)
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return ret;
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put_unaligned_le32(clk_id, t->tx.buf);
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ret = ph->xops->do_xfer(ph, t);
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if (!ret)
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*value = get_unaligned_le64(t->rx.buf);
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ph->xops->xfer_put(ph, t);
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return ret;
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}
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static int scmi_clock_rate_set(const struct scmi_protocol_handle *ph,
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u32 clk_id, u64 rate)
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{
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int ret;
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u32 flags = 0;
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struct scmi_xfer *t;
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struct scmi_clock_set_rate *cfg;
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struct clock_info *ci = ph->get_priv(ph);
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ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_SET, sizeof(*cfg), 0, &t);
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if (ret)
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return ret;
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if (ci->max_async_req &&
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atomic_inc_return(&ci->cur_async_req) < ci->max_async_req)
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flags |= CLOCK_SET_ASYNC;
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cfg = t->tx.buf;
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cfg->flags = cpu_to_le32(flags);
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cfg->id = cpu_to_le32(clk_id);
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cfg->value_low = cpu_to_le32(rate & 0xffffffff);
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cfg->value_high = cpu_to_le32(rate >> 32);
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|
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if (flags & CLOCK_SET_ASYNC) {
|
||
|
|
ret = ph->xops->do_xfer_with_response(ph, t);
|
||
|
|
if (!ret) {
|
||
|
|
struct scmi_msg_resp_set_rate_complete *resp;
|
||
|
|
|
||
|
|
resp = t->rx.buf;
|
||
|
|
if (le32_to_cpu(resp->id) == clk_id)
|
||
|
|
dev_dbg(ph->dev,
|
||
|
|
"Clk ID %d set async to %llu\n", clk_id,
|
||
|
|
get_unaligned_le64(&resp->rate_low));
|
||
|
|
else
|
||
|
|
ret = -EPROTO;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ci->max_async_req)
|
||
|
|
atomic_dec(&ci->cur_async_req);
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
scmi_clock_config_set(const struct scmi_protocol_handle *ph, u32 clk_id,
|
||
|
|
u32 config, bool atomic)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
struct scmi_clock_set_config *cfg;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, CLOCK_CONFIG_SET,
|
||
|
|
sizeof(*cfg), 0, &t);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
t->hdr.poll_completion = atomic;
|
||
|
|
|
||
|
|
cfg = t->tx.buf;
|
||
|
|
cfg->id = cpu_to_le32(clk_id);
|
||
|
|
cfg->attributes = cpu_to_le32(config);
|
||
|
|
|
||
|
|
ret = ph->xops->do_xfer(ph, t);
|
||
|
|
|
||
|
|
ph->xops->xfer_put(ph, t);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clock_enable(const struct scmi_protocol_handle *ph, u32 clk_id)
|
||
|
|
{
|
||
|
|
return scmi_clock_config_set(ph, clk_id, CLOCK_ENABLE, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clock_disable(const struct scmi_protocol_handle *ph, u32 clk_id)
|
||
|
|
{
|
||
|
|
return scmi_clock_config_set(ph, clk_id, 0, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clock_enable_atomic(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 clk_id)
|
||
|
|
{
|
||
|
|
return scmi_clock_config_set(ph, clk_id, CLOCK_ENABLE, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clock_disable_atomic(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 clk_id)
|
||
|
|
{
|
||
|
|
return scmi_clock_config_set(ph, clk_id, 0, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clock_count_get(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
struct clock_info *ci = ph->get_priv(ph);
|
||
|
|
|
||
|
|
return ci->num_clocks;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_clock_info *
|
||
|
|
scmi_clock_info_get(const struct scmi_protocol_handle *ph, u32 clk_id)
|
||
|
|
{
|
||
|
|
struct scmi_clock_info *clk;
|
||
|
|
struct clock_info *ci = ph->get_priv(ph);
|
||
|
|
|
||
|
|
if (clk_id >= ci->num_clocks)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
clk = ci->clk + clk_id;
|
||
|
|
if (!clk->name[0])
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return clk;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_clk_proto_ops clk_proto_ops = {
|
||
|
|
.count_get = scmi_clock_count_get,
|
||
|
|
.info_get = scmi_clock_info_get,
|
||
|
|
.rate_get = scmi_clock_rate_get,
|
||
|
|
.rate_set = scmi_clock_rate_set,
|
||
|
|
.enable = scmi_clock_enable,
|
||
|
|
.disable = scmi_clock_disable,
|
||
|
|
.enable_atomic = scmi_clock_enable_atomic,
|
||
|
|
.disable_atomic = scmi_clock_disable_atomic,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int scmi_clk_rate_notify(const struct scmi_protocol_handle *ph,
|
||
|
|
u32 clk_id, int message_id, bool enable)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct scmi_xfer *t;
|
||
|
|
struct scmi_msg_clock_rate_notify *notify;
|
||
|
|
|
||
|
|
ret = ph->xops->xfer_get_init(ph, message_id, sizeof(*notify), 0, &t);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
notify = t->tx.buf;
|
||
|
|
notify->clk_id = cpu_to_le32(clk_id);
|
||
|
|
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_clk_set_notify_enabled(const struct scmi_protocol_handle *ph,
|
||
|
|
u8 evt_id, u32 src_id, bool enable)
|
||
|
|
{
|
||
|
|
int ret, cmd_id;
|
||
|
|
|
||
|
|
if (evt_id >= ARRAY_SIZE(evt_2_cmd))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
cmd_id = evt_2_cmd[evt_id];
|
||
|
|
ret = scmi_clk_rate_notify(ph, src_id, cmd_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_clk_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)
|
||
|
|
{
|
||
|
|
const struct scmi_clock_rate_notify_payld *p = payld;
|
||
|
|
struct scmi_clock_rate_notif_report *r = report;
|
||
|
|
|
||
|
|
if (sizeof(*p) != payld_sz ||
|
||
|
|
(evt_id != SCMI_EVENT_CLOCK_RATE_CHANGED &&
|
||
|
|
evt_id != SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
r->timestamp = timestamp;
|
||
|
|
r->agent_id = le32_to_cpu(p->agent_id);
|
||
|
|
r->clock_id = le32_to_cpu(p->clock_id);
|
||
|
|
r->rate = get_unaligned_le64(&p->rate_low);
|
||
|
|
*src_id = r->clock_id;
|
||
|
|
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int scmi_clk_get_num_sources(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
struct clock_info *ci = ph->get_priv(ph);
|
||
|
|
|
||
|
|
if (!ci)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return ci->num_clocks;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_event clk_events[] = {
|
||
|
|
{
|
||
|
|
.id = SCMI_EVENT_CLOCK_RATE_CHANGED,
|
||
|
|
.max_payld_sz = sizeof(struct scmi_clock_rate_notify_payld),
|
||
|
|
.max_report_sz = sizeof(struct scmi_clock_rate_notif_report),
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.id = SCMI_EVENT_CLOCK_RATE_CHANGE_REQUESTED,
|
||
|
|
.max_payld_sz = sizeof(struct scmi_clock_rate_notify_payld),
|
||
|
|
.max_report_sz = sizeof(struct scmi_clock_rate_notif_report),
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct scmi_event_ops clk_event_ops = {
|
||
|
|
.get_num_sources = scmi_clk_get_num_sources,
|
||
|
|
.set_notify_enabled = scmi_clk_set_notify_enabled,
|
||
|
|
.fill_custom_report = scmi_clk_fill_custom_report,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct scmi_protocol_events clk_protocol_events = {
|
||
|
|
.queue_sz = SCMI_PROTO_QUEUE_SZ,
|
||
|
|
.ops = &clk_event_ops,
|
||
|
|
.evts = clk_events,
|
||
|
|
.num_events = ARRAY_SIZE(clk_events),
|
||
|
|
};
|
||
|
|
|
||
|
|
static int scmi_clock_protocol_init(const struct scmi_protocol_handle *ph)
|
||
|
|
{
|
||
|
|
u32 version;
|
||
|
|
int clkid, ret;
|
||
|
|
struct clock_info *cinfo;
|
||
|
|
|
||
|
|
ret = ph->xops->version_get(ph, &version);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
dev_dbg(ph->dev, "Clock Version %d.%d\n",
|
||
|
|
PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
|
||
|
|
|
||
|
|
cinfo = devm_kzalloc(ph->dev, sizeof(*cinfo), GFP_KERNEL);
|
||
|
|
if (!cinfo)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ret = scmi_clock_protocol_attributes_get(ph, cinfo);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
cinfo->clk = devm_kcalloc(ph->dev, cinfo->num_clocks,
|
||
|
|
sizeof(*cinfo->clk), GFP_KERNEL);
|
||
|
|
if (!cinfo->clk)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
for (clkid = 0; clkid < cinfo->num_clocks; clkid++) {
|
||
|
|
struct scmi_clock_info *clk = cinfo->clk + clkid;
|
||
|
|
|
||
|
|
ret = scmi_clock_attributes_get(ph, clkid, clk, version);
|
||
|
|
if (!ret)
|
||
|
|
scmi_clock_describe_rates_get(ph, clkid, clk);
|
||
|
|
}
|
||
|
|
|
||
|
|
cinfo->version = version;
|
||
|
|
return ph->set_priv(ph, cinfo);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct scmi_protocol scmi_clock = {
|
||
|
|
.id = SCMI_PROTOCOL_CLOCK,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.instance_init = &scmi_clock_protocol_init,
|
||
|
|
.ops = &clk_proto_ops,
|
||
|
|
.events = &clk_protocol_events,
|
||
|
|
};
|
||
|
|
|
||
|
|
DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(clock, scmi_clock)
|