1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
7 #include <linux/interconnect-provider.h>
16 #include "bcm-voter.h"
17 #include "icc-rpmh.h"
23  * struct bcm_voter - Bus Clock Manager voter
24  * @dev: reference to the device that communicates with the BCM
25  * @np: reference to the device node to match bcm voters
26  * @lock: mutex to protect commit and wake/sleep lists in the voter
28  * @ws_list: list containing bcms that have different wake/sleep votes
33 	struct device *dev;
49 	if (bcm_a->aux_data.vcd < bcm_b->aux_data.vcd)  in cmp_vcd()
50 		return -1;  in cmp_vcd()
51 	else if (bcm_a->aux_data.vcd == bcm_b->aux_data.vcd)  in cmp_vcd()
77 		for (i = 0; i < bcm->num_nodes; i++) {  in bcm_aggregate()
78 			node = bcm->nodes[i];  in bcm_aggregate()
79 			temp = bcm_div(node->sum_avg[bucket] * bcm->aux_data.width,  in bcm_aggregate()
80 				       node->buswidth * node->channels);  in bcm_aggregate()
83 			temp = bcm_div(node->max_peak[bucket] * bcm->aux_data.width,  in bcm_aggregate()
84 				       node->buswidth);  in bcm_aggregate()
88 		temp = agg_avg[bucket] * bcm->vote_scale;  in bcm_aggregate()
89 		bcm->vote_x[bucket] = bcm_div(temp, bcm->aux_data.unit);  in bcm_aggregate()
91 		temp = agg_peak[bucket] * bcm->vote_scale;  in bcm_aggregate()
92 		bcm->vote_y[bucket] = bcm_div(temp, bcm->aux_data.unit);  in bcm_aggregate()
94 		if (bcm->enable_mask && (bcm->vote_x[bucket] || bcm->vote_y[bucket])) {  in bcm_aggregate()
95 			bcm->vote_x[bucket] = 0;  in bcm_aggregate()
96 			bcm->vote_y[bucket] = bcm->enable_mask;  in bcm_aggregate()
100 	if (bcm->keepalive && bcm->vote_x[QCOM_ICC_BUCKET_AMC] == 0 &&  in bcm_aggregate()
101 	    bcm->vote_y[QCOM_ICC_BUCKET_AMC] == 0) {  in bcm_aggregate()
102 		bcm->vote_x[QCOM_ICC_BUCKET_AMC] = 1;  in bcm_aggregate()
103 		bcm->vote_x[QCOM_ICC_BUCKET_WAKE] = 1;  in bcm_aggregate()
104 		bcm->vote_y[QCOM_ICC_BUCKET_AMC] = 1;  in bcm_aggregate()
105 		bcm->vote_y[QCOM_ICC_BUCKET_WAKE] = 1;  in bcm_aggregate()
128 	cmd->addr = addr;  in tcs_cmd_gen()
129 	cmd->data = BCM_TCS_CMD(commit, valid, vote_x, vote_y);  in tcs_cmd_gen()
135 	cmd->wait = wait;  in tcs_cmd_gen()
142 	struct list_head *bcm_list = &voter->commit_list;  in tcs_list_gen()
152 		if ((list_is_last(&bcm->list, bcm_list)) ||  in tcs_list_gen()
153 		    bcm->aux_data.vcd != list_next_entry(bcm, list)->aux_data.vcd) {  in tcs_list_gen()
158 		wait = commit && (voter->tcs_wait & BIT(bucket));  in tcs_list_gen()
160 		tcs_cmd_gen(&tcs_list[idx], bcm->vote_x[bucket],  in tcs_list_gen()
161 			    bcm->vote_y[bucket], bcm->addr, commit, wait);  in tcs_list_gen()
172 				n[batch] -= cur_vcd_size;  in tcs_list_gen()
181  * of_bcm_voter_get - gets a bcm voter handle from DT node
182  * @dev: device pointer for the consumer device
183  * @name: name for the bcm voter device
186  * specified in the device DT and return a bcm_voter handle on success.
191 struct bcm_voter *of_bcm_voter_get(struct device *dev, const char *name)  in of_bcm_voter_get()
193 	struct bcm_voter *voter = ERR_PTR(-EPROBE_DEFER);  in of_bcm_voter_get()
198 	if (!dev || !dev->of_node)  in of_bcm_voter_get()
199 		return ERR_PTR(-ENODEV);  in of_bcm_voter_get()
201 	np = dev->of_node;  in of_bcm_voter_get()
204 		idx = of_property_match_string(np, "qcom,bcm-voter-names", name);  in of_bcm_voter_get()
209 	node = of_parse_phandle(np, "qcom,bcm-voters", idx);  in of_bcm_voter_get()
213 		if (temp->np == node) {  in of_bcm_voter_get()
226  * qcom_icc_bcm_voter_add - queues up the bcm nodes that require updates
228  * @bcm: bcm to add to the commit and wake sleep list
235 	mutex_lock(&voter->lock);  in qcom_icc_bcm_voter_add()
236 	if (list_empty(&bcm->list))  in qcom_icc_bcm_voter_add()
237 		list_add_tail(&bcm->list, &voter->commit_list);  in qcom_icc_bcm_voter_add()
239 	if (list_empty(&bcm->ws_list))  in qcom_icc_bcm_voter_add()
240 		list_add_tail(&bcm->ws_list, &voter->ws_list);  in qcom_icc_bcm_voter_add()
242 	mutex_unlock(&voter->lock);  in qcom_icc_bcm_voter_add()
247  * qcom_icc_bcm_voter_commit - generates and commits tcs cmds based on bcms
250  * This function generates a set of AMC commands and flushes to the BCM device
251  * associated with the voter. It conditionally generate WAKE and SLEEP commands
252  * based on deltas between WAKE/SLEEP requirements. The ws_list persists
254  * requirements for WAKE matches SLEEP.
269 	mutex_lock(&voter->lock);  in qcom_icc_bcm_voter_commit()
270 	list_for_each_entry(bcm, &voter->commit_list, list)  in qcom_icc_bcm_voter_commit()
281 	list_sort(NULL, &voter->commit_list, cmp_vcd);  in qcom_icc_bcm_voter_commit()
291 	rpmh_invalidate(voter->dev);  in qcom_icc_bcm_voter_commit()
293 	ret = rpmh_write_batch(voter->dev, RPMH_ACTIVE_ONLY_STATE,  in qcom_icc_bcm_voter_commit()
300 	list_for_each_entry_safe(bcm, bcm_tmp, &voter->commit_list, list)  in qcom_icc_bcm_voter_commit()
301 		list_del_init(&bcm->list);  in qcom_icc_bcm_voter_commit()
303 	list_for_each_entry_safe(bcm, bcm_tmp, &voter->ws_list, ws_list) {  in qcom_icc_bcm_voter_commit()
305 		 * Only generate WAKE and SLEEP commands if a resource's  in qcom_icc_bcm_voter_commit()
309 		if (bcm->vote_x[QCOM_ICC_BUCKET_WAKE] !=  in qcom_icc_bcm_voter_commit()
310 		    bcm->vote_x[QCOM_ICC_BUCKET_SLEEP] ||  in qcom_icc_bcm_voter_commit()
311 		    bcm->vote_y[QCOM_ICC_BUCKET_WAKE] !=  in qcom_icc_bcm_voter_commit()
312 		    bcm->vote_y[QCOM_ICC_BUCKET_SLEEP])  in qcom_icc_bcm_voter_commit()
313 			list_add_tail(&bcm->list, &voter->commit_list);  in qcom_icc_bcm_voter_commit()
315 			list_del_init(&bcm->ws_list);  in qcom_icc_bcm_voter_commit()
318 	if (list_empty(&voter->commit_list))  in qcom_icc_bcm_voter_commit()
321 	list_sort(NULL, &voter->commit_list, cmp_vcd);  in qcom_icc_bcm_voter_commit()
325 	ret = rpmh_write_batch(voter->dev, RPMH_WAKE_ONLY_STATE, cmds, commit_idx);  in qcom_icc_bcm_voter_commit()
327 		pr_err("Error sending WAKE RPMH requests (%d)\n", ret);  in qcom_icc_bcm_voter_commit()
333 	ret = rpmh_write_batch(voter->dev, RPMH_SLEEP_STATE, cmds, commit_idx);  in qcom_icc_bcm_voter_commit()
340 	list_for_each_entry_safe(bcm, bcm_tmp, &voter->commit_list, list)  in qcom_icc_bcm_voter_commit()
341 		list_del_init(&bcm->list);  in qcom_icc_bcm_voter_commit()
343 	mutex_unlock(&voter->lock);  in qcom_icc_bcm_voter_commit()
350 	struct device_node *np = pdev->dev.of_node;  in qcom_icc_bcm_voter_probe()
353 	voter = devm_kzalloc(&pdev->dev, sizeof(*voter), GFP_KERNEL);  in qcom_icc_bcm_voter_probe()
355 		return -ENOMEM;  in qcom_icc_bcm_voter_probe()
357 	voter->dev = &pdev->dev;  in qcom_icc_bcm_voter_probe()
358 	voter->np = np;  in qcom_icc_bcm_voter_probe()
360 	if (of_property_read_u32(np, "qcom,tcs-wait", &voter->tcs_wait))  in qcom_icc_bcm_voter_probe()
361 		voter->tcs_wait = QCOM_ICC_TAG_ACTIVE_ONLY;  in qcom_icc_bcm_voter_probe()
363 	mutex_init(&voter->lock);  in qcom_icc_bcm_voter_probe()
364 	INIT_LIST_HEAD(&voter->commit_list);  in qcom_icc_bcm_voter_probe()
365 	INIT_LIST_HEAD(&voter->ws_list);  in qcom_icc_bcm_voter_probe()
368 	list_add_tail(&voter->voter_node, &bcm_voters);  in qcom_icc_bcm_voter_probe()
375 	{ .compatible = "qcom,bcm-voter" },