1 files changed, 375 insertions, 0 deletions
diff --git a/drivers/interconnect/qcom/icc-rpmh.c b/drivers/interconnect/qcom/icc-rpmh.c
new file mode 100644
index 000000000000..3b445acefece
--- /dev/null
+++ b/drivers/interconnect/qcom/icc-rpmh.c
@@ -0,0 +1,375 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/interconnect.h>
+#include <linux/interconnect-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+#include "bcm-voter.h"
+#include "icc-common.h"
+#include "icc-rpmh.h"
+
+/* QNOC QoS */
+#define QOSGEN_MAINCTL_LO(p, qp)	(0x8 + (p->port_offsets[qp]))
+#define QOS_SLV_URG_MSG_EN_MASK		GENMASK(3, 3)
+#define QOS_DFLT_PRIO_MASK		GENMASK(6, 4)
+#define QOS_DISABLE_MASK		GENMASK(24, 24)
+
+/**
+ * qcom_icc_set_qos - initialize static QoS configurations
+ * @qp: qcom icc provider to which @node belongs
+ * @node: qcom icc node to operate on
+ */
+static void qcom_icc_set_qos(struct qcom_icc_provider *qp,
+			     struct qcom_icc_node *node)
+{
+	const struct qcom_icc_qosbox *qos = node->qosbox;
+	int port;
+
+	for (port = 0; port < qos->num_ports; port++) {
+		regmap_update_bits(qp->regmap, QOSGEN_MAINCTL_LO(qos, port),
+				   QOS_DISABLE_MASK,
+				   FIELD_PREP(QOS_DISABLE_MASK, qos->prio_fwd_disable));
+
+		regmap_update_bits(qp->regmap, QOSGEN_MAINCTL_LO(qos, port),
+				   QOS_DFLT_PRIO_MASK,
+				   FIELD_PREP(QOS_DFLT_PRIO_MASK, qos->prio));
+
+		regmap_update_bits(qp->regmap, QOSGEN_MAINCTL_LO(qos, port),
+				   QOS_SLV_URG_MSG_EN_MASK,
+				   FIELD_PREP(QOS_SLV_URG_MSG_EN_MASK, qos->urg_fwd));
+	}
+}
+
+/**
+ * qcom_icc_pre_aggregate - cleans up stale values from prior icc_set
+ * @node: icc node to operate on
+ */
+void qcom_icc_pre_aggregate(struct icc_node *node)
+{
+	size_t i;
+	struct qcom_icc_node *qn;
+	struct qcom_icc_provider *qp;
+
+	qn = node->data;
+	qp = to_qcom_provider(node->provider);
+
+	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
+		qn->sum_avg[i] = 0;
+		qn->max_peak[i] = 0;
+	}
+
+	for (i = 0; i < qn->num_bcms; i++)
+		qcom_icc_bcm_voter_add(qp->voter, qn->bcms[i]);
+}
+EXPORT_SYMBOL_GPL(qcom_icc_pre_aggregate);
+
+/**
+ * qcom_icc_aggregate - aggregate bw for buckets indicated by tag
+ * @node: node to aggregate
+ * @tag: tag to indicate which buckets to aggregate
+ * @avg_bw: new bw to sum aggregate
+ * @peak_bw: new bw to max aggregate
+ * @agg_avg: existing aggregate avg bw val
+ * @agg_peak: existing aggregate peak bw val
+ */
+int qcom_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
+		       u32 peak_bw, u32 *agg_avg, u32 *agg_peak)
+{
+	size_t i;
+	struct qcom_icc_node *qn;
+
+	qn = node->data;
+
+	if (!tag)
+		tag = QCOM_ICC_TAG_ALWAYS;
+
+	for (i = 0; i < QCOM_ICC_NUM_BUCKETS; i++) {
+		if (tag & BIT(i)) {
+			qn->sum_avg[i] += avg_bw;
+			qn->max_peak[i] = max_t(u32, qn->max_peak[i], peak_bw);
+		}
+
+		if (node->init_avg || node->init_peak) {
+			qn->sum_avg[i] = max_t(u64, qn->sum_avg[i], node->init_avg);
+			qn->max_peak[i] = max_t(u64, qn->max_peak[i], node->init_peak);
+		}
+	}
+
+	*agg_avg += avg_bw;
+	*agg_peak = max_t(u32, *agg_peak, peak_bw);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_icc_aggregate);
+
+/**
+ * qcom_icc_set - set the constraints based on path
+ * @src: source node for the path to set constraints on
+ * @dst: destination node for the path to set constraints on
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+int qcom_icc_set(struct icc_node *src, struct icc_node *dst)
+{
+	struct qcom_icc_provider *qp;
+	struct icc_node *node;
+
+	if (!src)
+		node = dst;
+	else
+		node = src;
+
+	qp = to_qcom_provider(node->provider);
+
+	qcom_icc_bcm_voter_commit(qp->voter);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_icc_set);
+
+/**
+ * qcom_icc_bcm_init - populates bcm aux data and connect qnodes
+ * @bcm: bcm to be initialized
+ * @dev: associated provider device
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+int qcom_icc_bcm_init(struct qcom_icc_bcm *bcm, struct device *dev)
+{
+	struct qcom_icc_node *qn;
+	const struct bcm_db *data;
+	size_t data_count;
+	int i;
+
+	/* BCM is already initialised*/
+	if (bcm->addr)
+		return 0;
+
+	bcm->addr = cmd_db_read_addr(bcm->name);
+	if (!bcm->addr) {
+		dev_err(dev, "%s could not find RPMh address\n",
+			bcm->name);
+		return -EINVAL;
+	}
+
+	data = cmd_db_read_aux_data(bcm->name, &data_count);
+	if (IS_ERR(data)) {
+		dev_err(dev, "%s command db read error (%ld)\n",
+			bcm->name, PTR_ERR(data));
+		return PTR_ERR(data);
+	}
+	if (!data_count) {
+		dev_err(dev, "%s command db missing or partial aux data\n",
+			bcm->name);
+		return -EINVAL;
+	}
+
+	bcm->aux_data.unit = le32_to_cpu(data->unit);
+	bcm->aux_data.width = le16_to_cpu(data->width);
+	bcm->aux_data.vcd = data->vcd;
+	bcm->aux_data.reserved = data->reserved;
+	INIT_LIST_HEAD(&bcm->list);
+	INIT_LIST_HEAD(&bcm->ws_list);
+
+	if (!bcm->vote_scale)
+		bcm->vote_scale = 1000;
+
+	/* Link Qnodes to their respective BCMs */
+	for (i = 0; i < bcm->num_nodes; i++) {
+		qn = bcm->nodes[i];
+		qn->bcms[qn->num_bcms] = bcm;
+		qn->num_bcms++;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_icc_bcm_init);
+
+/**
+ * qcom_icc_rpmh_configure_qos - configure QoS parameters
+ * @qp: qcom icc provider associated with QoS endpoint nodes
+ *
+ * Return: 0 on success, or an error code otherwise
+ */
+static int qcom_icc_rpmh_configure_qos(struct qcom_icc_provider *qp)
+{
+	struct qcom_icc_node *qnode;
+	size_t i;
+	int ret;
+
+	ret = clk_bulk_prepare_enable(qp->num_clks, qp->clks);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < qp->num_nodes; i++) {
+		qnode = qp->nodes[i];
+		if (!qnode)
+			continue;
+
+		if (qnode->qosbox)
+			qcom_icc_set_qos(qp, qnode);
+	}
+
+	clk_bulk_disable_unprepare(qp->num_clks, qp->clks);
+
+	return ret;
+}
+
+int qcom_icc_rpmh_probe(struct platform_device *pdev)
+{
+	const struct qcom_icc_desc *desc;
+	struct device *dev = &pdev->dev;
+	struct icc_onecell_data *data;
+	struct icc_provider *provider;
+	struct qcom_icc_node * const *qnodes, *qn;
+	struct qcom_icc_provider *qp;
+	struct icc_node *node;
+	size_t num_nodes, i, j;
+	int ret;
+
+	desc = of_device_get_match_data(dev);
+	if (!desc)
+		return -EINVAL;
+
+	qnodes = desc->nodes;
+	num_nodes = desc->num_nodes;
+
+	qp = devm_kzalloc(dev, sizeof(*qp), GFP_KERNEL);
+	if (!qp)
+		return -ENOMEM;
+
+	data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	data->num_nodes = num_nodes;
+
+	provider = &qp->provider;
+	provider->dev = dev;
+	provider->set = qcom_icc_set;
+	provider->pre_aggregate = qcom_icc_pre_aggregate;
+	provider->aggregate = qcom_icc_aggregate;
+	provider->xlate_extended = qcom_icc_xlate_extended;
+	provider->data = data;
+
+	icc_provider_init(provider);
+
+	qp->dev = dev;
+	qp->bcms = desc->bcms;
+	qp->nodes = desc->nodes;
+	qp->num_bcms = desc->num_bcms;
+	qp->num_nodes = desc->num_nodes;
+
+	qp->voter = of_bcm_voter_get(qp->dev, NULL);
+	if (IS_ERR(qp->voter))
+		return PTR_ERR(qp->voter);
+
+	for (i = 0; i < qp->num_bcms; i++)
+		qcom_icc_bcm_init(qp->bcms[i], dev);
+
+	for (i = 0; i < num_nodes; i++) {
+		qn = qnodes[i];
+		if (!qn)
+			continue;
+
+		if (!qn->node)
+			qn->node = icc_node_create_dyn();
+
+		node = qn->node;
+		if (IS_ERR(node)) {
+			ret = PTR_ERR(node);
+			goto err_remove_nodes;
+		}
+
+		ret = icc_node_set_name(node, provider, qn->name);
+		if (ret) {
+			icc_node_destroy(node->id);
+			goto err_remove_nodes;
+		}
+
+		node->data = qn;
+		icc_node_add(node, provider);
+
+		for (j = 0; j < qn->num_links; j++)
+			icc_link_nodes(node, &qn->link_nodes[j]->node);
+
+		data->nodes[i] = node;
+	}
+
+	if (desc->config) {
+		struct resource *res;
+		void __iomem *base;
+
+		/* Try parent's regmap first */
+		qp->regmap = dev_get_regmap(dev->parent, NULL);
+		if (!qp->regmap) {
+			base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+			if (IS_ERR(base))
+				goto skip_qos_config;
+
+			qp->regmap = devm_regmap_init_mmio(dev, base, desc->config);
+			if (IS_ERR(qp->regmap)) {
+				dev_info(dev, "Skipping QoS, regmap failed; %ld\n",
+					 PTR_ERR(qp->regmap));
+				goto skip_qos_config;
+			}
+		}
+
+		qp->num_clks = devm_clk_bulk_get_all(qp->dev, &qp->clks);
+		if (qp->num_clks == -EPROBE_DEFER)
+			return dev_err_probe(dev, qp->num_clks, "Failed to get QoS clocks\n");
+
+		if (qp->num_clks < 0 || (!qp->num_clks && desc->qos_requires_clocks)) {
+			dev_info(dev, "Skipping QoS, failed to get clk: %d\n", qp->num_clks);
+			goto skip_qos_config;
+		}
+
+		ret = qcom_icc_rpmh_configure_qos(qp);
+		if (ret)
+			dev_info(dev, "Failed to program QoS: %d\n", ret);
+	}
+
+skip_qos_config:
+	ret = icc_provider_register(provider);
+	if (ret)
+		goto err_remove_nodes;
+
+	platform_set_drvdata(pdev, qp);
+
+	/* Populate child NoC devices if any */
+	if (of_get_child_count(dev->of_node) > 0) {
+		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
+		if (ret)
+			goto err_deregister_provider;
+	}
+
+	return 0;
+
+err_deregister_provider:
+	icc_provider_deregister(provider);
+err_remove_nodes:
+	icc_nodes_remove(provider);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(qcom_icc_rpmh_probe);
+
+void qcom_icc_rpmh_remove(struct platform_device *pdev)
+{
+	struct qcom_icc_provider *qp = platform_get_drvdata(pdev);
+
+	icc_provider_deregister(&qp->provider);
+	icc_nodes_remove(&qp->provider);
+}
+EXPORT_SYMBOL_GPL(qcom_icc_rpmh_remove);
+
+MODULE_DESCRIPTION("Qualcomm RPMh interconnect driver");
+MODULE_LICENSE("GPL v2");