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