2020-02-28 18:11:40 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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2021-04-23 02:36:10 +08:00
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* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
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2020-02-28 18:11:40 +08:00
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*/
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#include <asm/div64.h>
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#include <linux/interconnect-provider.h>
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#include <linux/list_sort.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <soc/qcom/rpmh.h>
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#include <soc/qcom/tcs.h>
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#include "bcm-voter.h"
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#include "icc-rpmh.h"
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static LIST_HEAD(bcm_voters);
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static DEFINE_MUTEX(bcm_voter_lock);
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/**
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* struct bcm_voter - Bus Clock Manager voter
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* @dev: reference to the device that communicates with the BCM
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* @np: reference to the device node to match bcm voters
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* @lock: mutex to protect commit and wake/sleep lists in the voter
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* @commit_list: list containing bcms to be committed to hardware
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* @ws_list: list containing bcms that have different wake/sleep votes
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* @voter_node: list of bcm voters
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2020-09-04 03:21:47 +08:00
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* @tcs_wait: mask for which buckets require TCS completion
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2020-02-28 18:11:40 +08:00
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*/
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struct bcm_voter {
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struct device *dev;
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struct device_node *np;
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struct mutex lock;
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struct list_head commit_list;
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struct list_head ws_list;
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struct list_head voter_node;
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2020-09-04 03:21:47 +08:00
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u32 tcs_wait;
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2020-02-28 18:11:40 +08:00
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};
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2021-04-09 02:28:34 +08:00
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static int cmp_vcd(void *priv, const struct list_head *a, const struct list_head *b)
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2020-02-28 18:11:40 +08:00
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{
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2020-10-14 01:19:23 +08:00
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const struct qcom_icc_bcm *bcm_a = list_entry(a, struct qcom_icc_bcm, list);
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const struct qcom_icc_bcm *bcm_b = list_entry(b, struct qcom_icc_bcm, list);
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2020-02-28 18:11:40 +08:00
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2020-10-14 01:19:23 +08:00
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return bcm_a->aux_data.vcd - bcm_b->aux_data.vcd;
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2020-02-28 18:11:40 +08:00
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}
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2020-09-04 03:21:44 +08:00
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static u64 bcm_div(u64 num, u32 base)
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{
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/* Ensure that small votes aren't lost. */
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if (num && num < base)
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return 1;
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do_div(num, base);
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return num;
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}
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2020-02-28 18:11:40 +08:00
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static void bcm_aggregate(struct qcom_icc_bcm *bcm)
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{
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2020-09-04 03:21:44 +08:00
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struct qcom_icc_node *node;
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2020-02-28 18:11:40 +08:00
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size_t i, bucket;
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u64 agg_avg[QCOM_ICC_NUM_BUCKETS] = {0};
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u64 agg_peak[QCOM_ICC_NUM_BUCKETS] = {0};
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u64 temp;
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for (bucket = 0; bucket < QCOM_ICC_NUM_BUCKETS; bucket++) {
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for (i = 0; i < bcm->num_nodes; i++) {
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2020-09-04 03:21:44 +08:00
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node = bcm->nodes[i];
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temp = bcm_div(node->sum_avg[bucket] * bcm->aux_data.width,
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node->buswidth * node->channels);
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2020-02-28 18:11:40 +08:00
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agg_avg[bucket] = max(agg_avg[bucket], temp);
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2020-09-04 03:21:44 +08:00
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temp = bcm_div(node->max_peak[bucket] * bcm->aux_data.width,
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node->buswidth);
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2020-02-28 18:11:40 +08:00
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agg_peak[bucket] = max(agg_peak[bucket], temp);
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}
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2020-09-04 03:21:49 +08:00
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temp = agg_avg[bucket] * bcm->vote_scale;
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2020-09-04 03:21:44 +08:00
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bcm->vote_x[bucket] = bcm_div(temp, bcm->aux_data.unit);
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2020-02-28 18:11:40 +08:00
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2020-09-04 03:21:49 +08:00
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temp = agg_peak[bucket] * bcm->vote_scale;
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2020-09-04 03:21:44 +08:00
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bcm->vote_y[bucket] = bcm_div(temp, bcm->aux_data.unit);
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2020-02-28 18:11:40 +08:00
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}
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if (bcm->keepalive && bcm->vote_x[QCOM_ICC_BUCKET_AMC] == 0 &&
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bcm->vote_y[QCOM_ICC_BUCKET_AMC] == 0) {
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bcm->vote_x[QCOM_ICC_BUCKET_AMC] = 1;
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bcm->vote_x[QCOM_ICC_BUCKET_WAKE] = 1;
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bcm->vote_y[QCOM_ICC_BUCKET_AMC] = 1;
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bcm->vote_y[QCOM_ICC_BUCKET_WAKE] = 1;
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}
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}
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static inline void tcs_cmd_gen(struct tcs_cmd *cmd, u64 vote_x, u64 vote_y,
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2020-09-04 03:21:47 +08:00
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u32 addr, bool commit, bool wait)
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2020-02-28 18:11:40 +08:00
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{
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bool valid = true;
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if (!cmd)
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return;
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2020-04-15 21:03:27 +08:00
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memset(cmd, 0, sizeof(*cmd));
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2020-02-28 18:11:40 +08:00
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if (vote_x == 0 && vote_y == 0)
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valid = false;
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if (vote_x > BCM_TCS_CMD_VOTE_MASK)
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vote_x = BCM_TCS_CMD_VOTE_MASK;
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if (vote_y > BCM_TCS_CMD_VOTE_MASK)
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vote_y = BCM_TCS_CMD_VOTE_MASK;
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cmd->addr = addr;
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cmd->data = BCM_TCS_CMD(commit, valid, vote_x, vote_y);
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/*
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* Set the wait for completion flag on command that need to be completed
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* before the next command.
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*/
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2020-09-04 03:21:47 +08:00
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cmd->wait = wait;
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2020-02-28 18:11:40 +08:00
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}
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2020-09-04 03:21:47 +08:00
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static void tcs_list_gen(struct bcm_voter *voter, int bucket,
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struct tcs_cmd tcs_list[MAX_VCD],
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2020-02-28 18:11:40 +08:00
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int n[MAX_VCD + 1])
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{
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2020-09-04 03:21:47 +08:00
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struct list_head *bcm_list = &voter->commit_list;
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2020-02-28 18:11:40 +08:00
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struct qcom_icc_bcm *bcm;
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2020-09-04 03:21:47 +08:00
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bool commit, wait;
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2020-02-28 18:11:40 +08:00
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size_t idx = 0, batch = 0, cur_vcd_size = 0;
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memset(n, 0, sizeof(int) * (MAX_VCD + 1));
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list_for_each_entry(bcm, bcm_list, list) {
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commit = false;
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cur_vcd_size++;
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if ((list_is_last(&bcm->list, bcm_list)) ||
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bcm->aux_data.vcd != list_next_entry(bcm, list)->aux_data.vcd) {
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commit = true;
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cur_vcd_size = 0;
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}
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2020-09-04 03:21:47 +08:00
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wait = commit && (voter->tcs_wait & BIT(bucket));
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2020-02-28 18:11:40 +08:00
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tcs_cmd_gen(&tcs_list[idx], bcm->vote_x[bucket],
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2020-09-04 03:21:47 +08:00
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bcm->vote_y[bucket], bcm->addr, commit, wait);
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2020-02-28 18:11:40 +08:00
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idx++;
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n[batch]++;
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/*
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* Batch the BCMs in such a way that we do not split them in
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* multiple payloads when they are under the same VCD. This is
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* to ensure that every BCM is committed since we only set the
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* commit bit on the last BCM request of every VCD.
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*/
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if (n[batch] >= MAX_RPMH_PAYLOAD) {
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if (!commit) {
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n[batch] -= cur_vcd_size;
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n[batch + 1] = cur_vcd_size;
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}
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batch++;
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}
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}
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}
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/**
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* of_bcm_voter_get - gets a bcm voter handle from DT node
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* @dev: device pointer for the consumer device
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* @name: name for the bcm voter device
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*
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* This function will match a device_node pointer for the phandle
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* specified in the device DT and return a bcm_voter handle on success.
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*
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* Returns bcm_voter pointer or ERR_PTR() on error. EPROBE_DEFER is returned
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* when matching bcm voter is yet to be found.
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*/
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struct bcm_voter *of_bcm_voter_get(struct device *dev, const char *name)
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{
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struct bcm_voter *voter = ERR_PTR(-EPROBE_DEFER);
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struct bcm_voter *temp;
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struct device_node *np, *node;
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int idx = 0;
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if (!dev || !dev->of_node)
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return ERR_PTR(-ENODEV);
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np = dev->of_node;
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if (name) {
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idx = of_property_match_string(np, "qcom,bcm-voter-names", name);
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if (idx < 0)
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return ERR_PTR(idx);
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}
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node = of_parse_phandle(np, "qcom,bcm-voters", idx);
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mutex_lock(&bcm_voter_lock);
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list_for_each_entry(temp, &bcm_voters, voter_node) {
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if (temp->np == node) {
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voter = temp;
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break;
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}
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}
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mutex_unlock(&bcm_voter_lock);
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2021-04-23 02:36:10 +08:00
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of_node_put(node);
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2020-02-28 18:11:40 +08:00
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return voter;
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}
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EXPORT_SYMBOL_GPL(of_bcm_voter_get);
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/**
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* qcom_icc_bcm_voter_add - queues up the bcm nodes that require updates
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* @voter: voter that the bcms are being added to
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* @bcm: bcm to add to the commit and wake sleep list
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*/
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void qcom_icc_bcm_voter_add(struct bcm_voter *voter, struct qcom_icc_bcm *bcm)
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{
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if (!voter)
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return;
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mutex_lock(&voter->lock);
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if (list_empty(&bcm->list))
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list_add_tail(&bcm->list, &voter->commit_list);
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if (list_empty(&bcm->ws_list))
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list_add_tail(&bcm->ws_list, &voter->ws_list);
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mutex_unlock(&voter->lock);
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}
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EXPORT_SYMBOL_GPL(qcom_icc_bcm_voter_add);
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/**
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* qcom_icc_bcm_voter_commit - generates and commits tcs cmds based on bcms
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* @voter: voter that needs flushing
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*
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* This function generates a set of AMC commands and flushes to the BCM device
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* associated with the voter. It conditionally generate WAKE and SLEEP commands
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* based on deltas between WAKE/SLEEP requirements. The ws_list persists
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* through multiple commit requests and bcm nodes are removed only when the
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* requirements for WAKE matches SLEEP.
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*
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* Returns 0 on success, or an appropriate error code otherwise.
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*/
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int qcom_icc_bcm_voter_commit(struct bcm_voter *voter)
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{
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struct qcom_icc_bcm *bcm;
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struct qcom_icc_bcm *bcm_tmp;
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int commit_idx[MAX_VCD + 1];
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struct tcs_cmd cmds[MAX_BCMS];
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int ret = 0;
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if (!voter)
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return 0;
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mutex_lock(&voter->lock);
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list_for_each_entry(bcm, &voter->commit_list, list)
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bcm_aggregate(bcm);
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/*
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* Pre sort the BCMs based on VCD for ease of generating a command list
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* that groups the BCMs with the same VCD together. VCDs are numbered
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* with lowest being the most expensive time wise, ensuring that
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* those commands are being sent the earliest in the queue. This needs
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* to be sorted every commit since we can't guarantee the order in which
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* the BCMs are added to the list.
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*/
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list_sort(NULL, &voter->commit_list, cmp_vcd);
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/*
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* Construct the command list based on a pre ordered list of BCMs
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* based on VCD.
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*/
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2020-09-04 03:21:47 +08:00
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tcs_list_gen(voter, QCOM_ICC_BUCKET_AMC, cmds, commit_idx);
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2020-02-28 18:11:40 +08:00
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if (!commit_idx[0])
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goto out;
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2020-06-18 21:05:53 +08:00
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rpmh_invalidate(voter->dev);
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2020-02-28 18:11:40 +08:00
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ret = rpmh_write_batch(voter->dev, RPMH_ACTIVE_ONLY_STATE,
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cmds, commit_idx);
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if (ret) {
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pr_err("Error sending AMC RPMH requests (%d)\n", ret);
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goto out;
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}
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list_for_each_entry_safe(bcm, bcm_tmp, &voter->commit_list, list)
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list_del_init(&bcm->list);
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list_for_each_entry_safe(bcm, bcm_tmp, &voter->ws_list, ws_list) {
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/*
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* Only generate WAKE and SLEEP commands if a resource's
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* requirements change as the execution environment transitions
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* between different power states.
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*/
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if (bcm->vote_x[QCOM_ICC_BUCKET_WAKE] !=
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bcm->vote_x[QCOM_ICC_BUCKET_SLEEP] ||
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bcm->vote_y[QCOM_ICC_BUCKET_WAKE] !=
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bcm->vote_y[QCOM_ICC_BUCKET_SLEEP])
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list_add_tail(&bcm->list, &voter->commit_list);
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else
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list_del_init(&bcm->ws_list);
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}
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if (list_empty(&voter->commit_list))
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goto out;
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list_sort(NULL, &voter->commit_list, cmp_vcd);
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2020-09-04 03:21:47 +08:00
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tcs_list_gen(voter, QCOM_ICC_BUCKET_WAKE, cmds, commit_idx);
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2020-02-28 18:11:40 +08:00
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ret = rpmh_write_batch(voter->dev, RPMH_WAKE_ONLY_STATE, cmds, commit_idx);
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if (ret) {
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pr_err("Error sending WAKE RPMH requests (%d)\n", ret);
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goto out;
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}
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2020-09-04 03:21:47 +08:00
|
|
|
tcs_list_gen(voter, QCOM_ICC_BUCKET_SLEEP, cmds, commit_idx);
|
2020-02-28 18:11:40 +08:00
|
|
|
|
|
|
|
ret = rpmh_write_batch(voter->dev, RPMH_SLEEP_STATE, cmds, commit_idx);
|
|
|
|
if (ret) {
|
|
|
|
pr_err("Error sending SLEEP RPMH requests (%d)\n", ret);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
list_for_each_entry_safe(bcm, bcm_tmp, &voter->commit_list, list)
|
|
|
|
list_del_init(&bcm->list);
|
|
|
|
|
|
|
|
mutex_unlock(&voter->lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(qcom_icc_bcm_voter_commit);
|
|
|
|
|
|
|
|
static int qcom_icc_bcm_voter_probe(struct platform_device *pdev)
|
|
|
|
{
|
2020-09-04 03:21:47 +08:00
|
|
|
struct device_node *np = pdev->dev.of_node;
|
2020-02-28 18:11:40 +08:00
|
|
|
struct bcm_voter *voter;
|
|
|
|
|
|
|
|
voter = devm_kzalloc(&pdev->dev, sizeof(*voter), GFP_KERNEL);
|
|
|
|
if (!voter)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
voter->dev = &pdev->dev;
|
2020-09-04 03:21:47 +08:00
|
|
|
voter->np = np;
|
|
|
|
|
|
|
|
if (of_property_read_u32(np, "qcom,tcs-wait", &voter->tcs_wait))
|
2020-09-04 03:21:48 +08:00
|
|
|
voter->tcs_wait = QCOM_ICC_TAG_ACTIVE_ONLY;
|
2020-09-04 03:21:47 +08:00
|
|
|
|
2020-02-28 18:11:40 +08:00
|
|
|
mutex_init(&voter->lock);
|
|
|
|
INIT_LIST_HEAD(&voter->commit_list);
|
|
|
|
INIT_LIST_HEAD(&voter->ws_list);
|
|
|
|
|
|
|
|
mutex_lock(&bcm_voter_lock);
|
|
|
|
list_add_tail(&voter->voter_node, &bcm_voters);
|
|
|
|
mutex_unlock(&bcm_voter_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id bcm_voter_of_match[] = {
|
|
|
|
{ .compatible = "qcom,bcm-voter" },
|
|
|
|
{ }
|
|
|
|
};
|
2021-05-11 11:44:33 +08:00
|
|
|
MODULE_DEVICE_TABLE(of, bcm_voter_of_match);
|
2020-02-28 18:11:40 +08:00
|
|
|
|
|
|
|
static struct platform_driver qcom_icc_bcm_voter_driver = {
|
|
|
|
.probe = qcom_icc_bcm_voter_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = "bcm_voter",
|
|
|
|
.of_match_table = bcm_voter_of_match,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
module_platform_driver(qcom_icc_bcm_voter_driver);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("David Dai <daidavid1@codeaurora.org>");
|
|
|
|
MODULE_DESCRIPTION("Qualcomm BCM Voter interconnect driver");
|
|
|
|
MODULE_LICENSE("GPL v2");
|