drivers/interconnect/qcom/osm-l3.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
  */

 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/interconnect-provider.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>

 #include <dt-bindings/interconnect/qcom,osm-l3.h>

 #include "sc7180.h"
 #include "sc7280.h"
 #include "sc8180x.h"
 #include "sdm845.h"
 #include "sm8150.h"
 #include "sm8250.h"

 #define LUT_MAX_ENTRIES			40U
 #define LUT_SRC				GENMASK(31, 30)
 #define LUT_L_VAL			GENMASK(7, 0)
 #define CLK_HW_DIV			2

 /* OSM Register offsets */
 #define REG_ENABLE			0x0
 #define OSM_LUT_ROW_SIZE		32
 #define OSM_REG_FREQ_LUT		0x110
 #define OSM_REG_PERF_STATE		0x920

 /* EPSS Register offsets */
 #define EPSS_LUT_ROW_SIZE		4
 #define EPSS_REG_FREQ_LUT		0x100
 #define EPSS_REG_PERF_STATE		0x320

 #define OSM_L3_MAX_LINKS		1

 #define to_osm_l3_provider(_provider) \
 	container_of(_provider, struct qcom_osm_l3_icc_provider, provider)

 struct qcom_osm_l3_icc_provider {
 	void __iomem *base;
 	unsigned int max_state;
 	unsigned int reg_perf_state;
 	unsigned long lut_tables[LUT_MAX_ENTRIES];
 	struct icc_provider provider;
 };

 /**
  * struct qcom_osm_l3_node - Qualcomm specific interconnect nodes
  * @name: the node name used in debugfs
  * @links: an array of nodes where we can go next while traversing
  * @id: a unique node identifier
  * @num_links: the total number of @links
  * @buswidth: width of the interconnect between a node and the bus
  */
 struct qcom_osm_l3_node {
 	const char *name;
 	u16 links[OSM_L3_MAX_LINKS];
 	u16 id;
 	u16 num_links;
 	u16 buswidth;
 };

 struct qcom_osm_l3_desc {
 	const struct qcom_osm_l3_node * const *nodes;
 	size_t num_nodes;
 	unsigned int lut_row_size;
 	unsigned int reg_freq_lut;
 	unsigned int reg_perf_state;
 };

 #define DEFINE_QNODE(_name, _id, _buswidth, ...)			\
 	static const struct qcom_osm_l3_node _name = {			\
 		.name = #_name,						\
 		.id = _id,						\
 		.buswidth = _buswidth,					\
 		.num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })),	\
 		.links = { __VA_ARGS__ },				\
 	}

 DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
 DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16);

 static const struct qcom_osm_l3_node * const sdm845_osm_l3_nodes[] = {
 	[MASTER_OSM_L3_APPS] = &sdm845_osm_apps_l3,
 	[SLAVE_OSM_L3] = &sdm845_osm_l3,
 };

 static const struct qcom_osm_l3_desc sdm845_icc_osm_l3 = {
 	.nodes = sdm845_osm_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sdm845_osm_l3_nodes),
 	.lut_row_size = OSM_LUT_ROW_SIZE,
 	.reg_freq_lut = OSM_REG_FREQ_LUT,
 	.reg_perf_state = OSM_REG_PERF_STATE,
 };

 DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, SC7180_SLAVE_OSM_L3);
 DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16);

 static const struct qcom_osm_l3_node * const sc7180_osm_l3_nodes[] = {
 	[MASTER_OSM_L3_APPS] = &sc7180_osm_apps_l3,
 	[SLAVE_OSM_L3] = &sc7180_osm_l3,
 };

 static const struct qcom_osm_l3_desc sc7180_icc_osm_l3 = {
 	.nodes = sc7180_osm_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sc7180_osm_l3_nodes),
 	.lut_row_size = OSM_LUT_ROW_SIZE,
 	.reg_freq_lut = OSM_REG_FREQ_LUT,
 	.reg_perf_state = OSM_REG_PERF_STATE,
 };

 DEFINE_QNODE(sc7280_epss_apps_l3, SC7280_MASTER_EPSS_L3_APPS, 32, SC7280_SLAVE_EPSS_L3);
 DEFINE_QNODE(sc7280_epss_l3, SC7280_SLAVE_EPSS_L3, 32);

 static const struct qcom_osm_l3_node * const sc7280_epss_l3_nodes[] = {
 	[MASTER_EPSS_L3_APPS] = &sc7280_epss_apps_l3,
 	[SLAVE_EPSS_L3_SHARED] = &sc7280_epss_l3,
 };

 static const struct qcom_osm_l3_desc sc7280_icc_epss_l3 = {
 	.nodes = sc7280_epss_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sc7280_epss_l3_nodes),
 	.lut_row_size = EPSS_LUT_ROW_SIZE,
 	.reg_freq_lut = EPSS_REG_FREQ_LUT,
 	.reg_perf_state = EPSS_REG_PERF_STATE,
 };

 DEFINE_QNODE(sc8180x_osm_apps_l3, SC8180X_MASTER_OSM_L3_APPS, 32, SC8180X_SLAVE_OSM_L3);
 DEFINE_QNODE(sc8180x_osm_l3, SC8180X_SLAVE_OSM_L3, 32);

 static const struct qcom_osm_l3_node * const sc8180x_osm_l3_nodes[] = {
 	[MASTER_OSM_L3_APPS] = &sc8180x_osm_apps_l3,
 	[SLAVE_OSM_L3] = &sc8180x_osm_l3,
 };

 static const struct qcom_osm_l3_desc sc8180x_icc_osm_l3 = {
 	.nodes = sc8180x_osm_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sc8180x_osm_l3_nodes),
 	.lut_row_size = OSM_LUT_ROW_SIZE,
 	.reg_freq_lut = OSM_REG_FREQ_LUT,
 	.reg_perf_state = OSM_REG_PERF_STATE,
 };

 DEFINE_QNODE(sm8150_osm_apps_l3, SM8150_MASTER_OSM_L3_APPS, 32, SM8150_SLAVE_OSM_L3);
 DEFINE_QNODE(sm8150_osm_l3, SM8150_SLAVE_OSM_L3, 32);

 static const struct qcom_osm_l3_node * const sm8150_osm_l3_nodes[] = {
 	[MASTER_OSM_L3_APPS] = &sm8150_osm_apps_l3,
 	[SLAVE_OSM_L3] = &sm8150_osm_l3,
 };

 static const struct qcom_osm_l3_desc sm8150_icc_osm_l3 = {
 	.nodes = sm8150_osm_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sm8150_osm_l3_nodes),
 	.lut_row_size = OSM_LUT_ROW_SIZE,
 	.reg_freq_lut = OSM_REG_FREQ_LUT,
 	.reg_perf_state = OSM_REG_PERF_STATE,
 };

 DEFINE_QNODE(sm8250_epss_apps_l3, SM8250_MASTER_EPSS_L3_APPS, 32, SM8250_SLAVE_EPSS_L3);
 DEFINE_QNODE(sm8250_epss_l3, SM8250_SLAVE_EPSS_L3, 32);

 static const struct qcom_osm_l3_node * const sm8250_epss_l3_nodes[] = {
 	[MASTER_EPSS_L3_APPS] = &sm8250_epss_apps_l3,
 	[SLAVE_EPSS_L3_SHARED] = &sm8250_epss_l3,
 };

 static const struct qcom_osm_l3_desc sm8250_icc_epss_l3 = {
 	.nodes = sm8250_epss_l3_nodes,
 	.num_nodes = ARRAY_SIZE(sm8250_epss_l3_nodes),
 	.lut_row_size = EPSS_LUT_ROW_SIZE,
 	.reg_freq_lut = EPSS_REG_FREQ_LUT,
 	.reg_perf_state = EPSS_REG_PERF_STATE,
 };

 static int qcom_osm_l3_set(struct icc_node *src, struct icc_node *dst)
 {
 	struct qcom_osm_l3_icc_provider *qp;
 	struct icc_provider *provider;
 	const struct qcom_osm_l3_node *qn;
 	struct icc_node *n;
 	unsigned int index;
 	u32 agg_peak = 0;
 	u32 agg_avg = 0;
 	u64 rate;

 	qn = src->data;
 	provider = src->provider;
 	qp = to_osm_l3_provider(provider);

 	list_for_each_entry(n, &provider->nodes, node_list)
 		provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
 				    &agg_avg, &agg_peak);

 	rate = max(agg_avg, agg_peak);
 	rate = icc_units_to_bps(rate);
 	do_div(rate, qn->buswidth);

 	for (index = 0; index < qp->max_state - 1; index++) {
 		if (qp->lut_tables[index] >= rate)
 			break;
 	}

 	writel_relaxed(index, qp->base + qp->reg_perf_state);

 	return 0;
 }

 static int qcom_osm_l3_remove(struct platform_device *pdev)
 {
 	struct qcom_osm_l3_icc_provider *qp = platform_get_drvdata(pdev);

 	icc_provider_deregister(&qp->provider);
 	icc_nodes_remove(&qp->provider);

 	return 0;
 }

 static int qcom_osm_l3_probe(struct platform_device *pdev)
 {
 	u32 info, src, lval, i, prev_freq = 0, freq;
 	static unsigned long hw_rate, xo_rate;
 	struct qcom_osm_l3_icc_provider *qp;
 	const struct qcom_osm_l3_desc *desc;
 	struct icc_onecell_data *data;
 	struct icc_provider *provider;
 	const struct qcom_osm_l3_node * const *qnodes;
 	struct icc_node *node;
 	size_t num_nodes;
 	struct clk *clk;
 	int ret;

 	clk = clk_get(&pdev->dev, "xo");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	xo_rate = clk_get_rate(clk);
 	clk_put(clk);

 	clk = clk_get(&pdev->dev, "alternate");
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);

 	hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
 	clk_put(clk);

 	qp = devm_kzalloc(&pdev->dev, sizeof(*qp), GFP_KERNEL);
 	if (!qp)
 		return -ENOMEM;

 	qp->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(qp->base))
 		return PTR_ERR(qp->base);

 	/* HW should be in enabled state to proceed */
 	if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
 		dev_err(&pdev->dev, "error hardware not enabled\n");
 		return -ENODEV;
 	}

 	desc = device_get_match_data(&pdev->dev);
 	if (!desc)
 		return -EINVAL;

 	qp->reg_perf_state = desc->reg_perf_state;

 	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
 		info = readl_relaxed(qp->base + desc->reg_freq_lut +
 				     i * desc->lut_row_size);
 		src = FIELD_GET(LUT_SRC, info);
 		lval = FIELD_GET(LUT_L_VAL, info);
 		if (src)
 			freq = xo_rate * lval;
 		else
 			freq = hw_rate;

 		/* Two of the same frequencies signify end of table */
 		if (i > 0 && prev_freq == freq)
 			break;

 		dev_dbg(&pdev->dev, "index=%d freq=%d\n", i, freq);

 		qp->lut_tables[i] = freq;
 		prev_freq = freq;
 	}
 	qp->max_state = i;

 	qnodes = desc->nodes;
 	num_nodes = desc->num_nodes;

 	data = devm_kzalloc(&pdev->dev, struct_size(data, nodes, num_nodes), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	provider = &qp->provider;
 	provider->dev = &pdev->dev;
 	provider->set = qcom_osm_l3_set;
 	provider->aggregate = icc_std_aggregate;
 	provider->xlate = of_icc_xlate_onecell;
 	provider->data = data;

 	icc_provider_init(provider);

 	for (i = 0; i < num_nodes; i++) {
 		size_t j;

 		node = icc_node_create(qnodes[i]->id);
 		if (IS_ERR(node)) {
 			ret = PTR_ERR(node);
 			goto err;
 		}

 		node->name = qnodes[i]->name;
 		/* Cast away const and add it back in qcom_osm_l3_set() */
 		node->data = (void *)qnodes[i];
 		icc_node_add(node, provider);

 		for (j = 0; j < qnodes[i]->num_links; j++)
 			icc_link_create(node, qnodes[i]->links[j]);

 		data->nodes[i] = node;
 	}
 	data->num_nodes = num_nodes;

 	ret = icc_provider_register(provider);
 	if (ret)
 		goto err;

 	platform_set_drvdata(pdev, qp);

 	return 0;
 err:
 	icc_nodes_remove(provider);

 	return ret;
 }

 static const struct of_device_id osm_l3_of_match[] = {
 	{ .compatible = "qcom,sc7180-osm-l3", .data = &sc7180_icc_osm_l3 },
 	{ .compatible = "qcom,sc7280-epss-l3", .data = &sc7280_icc_epss_l3 },
 	{ .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_icc_osm_l3 },
 	{ .compatible = "qcom,sm8150-osm-l3", .data = &sm8150_icc_osm_l3 },
 	{ .compatible = "qcom,sc8180x-osm-l3", .data = &sc8180x_icc_osm_l3 },
 	{ .compatible = "qcom,sm8250-epss-l3", .data = &sm8250_icc_epss_l3 },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, osm_l3_of_match);

 static struct platform_driver osm_l3_driver = {
 	.probe = qcom_osm_l3_probe,
 	.remove = qcom_osm_l3_remove,
 	.driver = {
 		.name = "osm-l3",
 		.of_match_table = osm_l3_of_match,
 		.sync_state = icc_sync_state,
 	},
 };
 module_platform_driver(osm_l3_driver);

 MODULE_DESCRIPTION("Qualcomm OSM L3 interconnect driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
	*/

	#include <linux/bitfield.h>
	#include <linux/clk.h>
	#include <linux/interconnect-provider.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>

	#include <dt-bindings/interconnect/qcom,osm-l3.h>

	#include "sc7180.h"
	#include "sc7280.h"
	#include "sc8180x.h"
	#include "sdm845.h"
	#include "sm8150.h"
	#include "sm8250.h"

	#define LUT_MAX_ENTRIES 40U
	#define LUT_SRC GENMASK(31, 30)
	#define LUT_L_VAL GENMASK(7, 0)
	#define CLK_HW_DIV 2

	/* OSM Register offsets */
	#define REG_ENABLE 0x0
	#define OSM_LUT_ROW_SIZE 32
	#define OSM_REG_FREQ_LUT 0x110
	#define OSM_REG_PERF_STATE 0x920

	/* EPSS Register offsets */
	#define EPSS_LUT_ROW_SIZE 4
	#define EPSS_REG_FREQ_LUT 0x100
	#define EPSS_REG_PERF_STATE 0x320

	#define OSM_L3_MAX_LINKS 1

	#define to_osm_l3_provider(_provider) \
	container_of(_provider, struct qcom_osm_l3_icc_provider, provider)

	struct qcom_osm_l3_icc_provider {
	void __iomem *base;
	unsigned int max_state;
	unsigned int reg_perf_state;
	unsigned long lut_tables[LUT_MAX_ENTRIES];
	struct icc_provider provider;
	};

	/**
	* struct qcom_osm_l3_node - Qualcomm specific interconnect nodes
	* @name: the node name used in debugfs
	* @links: an array of nodes where we can go next while traversing
	* @id: a unique node identifier
	* @num_links: the total number of @links
	* @buswidth: width of the interconnect between a node and the bus
	*/
	struct qcom_osm_l3_node {
	const char *name;
	u16 links[OSM_L3_MAX_LINKS];
	u16 id;
	u16 num_links;
	u16 buswidth;
	};

	struct qcom_osm_l3_desc {
	const struct qcom_osm_l3_node * const *nodes;
	size_t num_nodes;
	unsigned int lut_row_size;
	unsigned int reg_freq_lut;
	unsigned int reg_perf_state;
	};

	#define DEFINE_QNODE(_name, _id, _buswidth, ...) \
	static const struct qcom_osm_l3_node _name = { \
	.name = #_name, \
	.id = _id, \
	.buswidth = _buswidth, \
	.num_links = ARRAY_SIZE(((int[]){ __VA_ARGS__ })), \
	.links = { __VA_ARGS__ }, \
	}

	DEFINE_QNODE(sdm845_osm_apps_l3, SDM845_MASTER_OSM_L3_APPS, 16, SDM845_SLAVE_OSM_L3);
	DEFINE_QNODE(sdm845_osm_l3, SDM845_SLAVE_OSM_L3, 16);

	static const struct qcom_osm_l3_node * const sdm845_osm_l3_nodes[] = {
	[MASTER_OSM_L3_APPS] = &sdm845_osm_apps_l3,
	[SLAVE_OSM_L3] = &sdm845_osm_l3,
	};

	static const struct qcom_osm_l3_desc sdm845_icc_osm_l3 = {
	.nodes = sdm845_osm_l3_nodes,
	.num_nodes = ARRAY_SIZE(sdm845_osm_l3_nodes),
	.lut_row_size = OSM_LUT_ROW_SIZE,
	.reg_freq_lut = OSM_REG_FREQ_LUT,
	.reg_perf_state = OSM_REG_PERF_STATE,
	};

	DEFINE_QNODE(sc7180_osm_apps_l3, SC7180_MASTER_OSM_L3_APPS, 16, SC7180_SLAVE_OSM_L3);
	DEFINE_QNODE(sc7180_osm_l3, SC7180_SLAVE_OSM_L3, 16);

	static const struct qcom_osm_l3_node * const sc7180_osm_l3_nodes[] = {
	[MASTER_OSM_L3_APPS] = &sc7180_osm_apps_l3,
	[SLAVE_OSM_L3] = &sc7180_osm_l3,
	};

	static const struct qcom_osm_l3_desc sc7180_icc_osm_l3 = {
	.nodes = sc7180_osm_l3_nodes,
	.num_nodes = ARRAY_SIZE(sc7180_osm_l3_nodes),
	.lut_row_size = OSM_LUT_ROW_SIZE,
	.reg_freq_lut = OSM_REG_FREQ_LUT,
	.reg_perf_state = OSM_REG_PERF_STATE,
	};

	DEFINE_QNODE(sc7280_epss_apps_l3, SC7280_MASTER_EPSS_L3_APPS, 32, SC7280_SLAVE_EPSS_L3);
	DEFINE_QNODE(sc7280_epss_l3, SC7280_SLAVE_EPSS_L3, 32);

	static const struct qcom_osm_l3_node * const sc7280_epss_l3_nodes[] = {
	[MASTER_EPSS_L3_APPS] = &sc7280_epss_apps_l3,
	[SLAVE_EPSS_L3_SHARED] = &sc7280_epss_l3,
	};

	static const struct qcom_osm_l3_desc sc7280_icc_epss_l3 = {
	.nodes = sc7280_epss_l3_nodes,
	.num_nodes = ARRAY_SIZE(sc7280_epss_l3_nodes),
	.lut_row_size = EPSS_LUT_ROW_SIZE,
	.reg_freq_lut = EPSS_REG_FREQ_LUT,
	.reg_perf_state = EPSS_REG_PERF_STATE,
	};

	DEFINE_QNODE(sc8180x_osm_apps_l3, SC8180X_MASTER_OSM_L3_APPS, 32, SC8180X_SLAVE_OSM_L3);
	DEFINE_QNODE(sc8180x_osm_l3, SC8180X_SLAVE_OSM_L3, 32);

	static const struct qcom_osm_l3_node * const sc8180x_osm_l3_nodes[] = {
	[MASTER_OSM_L3_APPS] = &sc8180x_osm_apps_l3,
	[SLAVE_OSM_L3] = &sc8180x_osm_l3,
	};

	static const struct qcom_osm_l3_desc sc8180x_icc_osm_l3 = {
	.nodes = sc8180x_osm_l3_nodes,
	.num_nodes = ARRAY_SIZE(sc8180x_osm_l3_nodes),
	.lut_row_size = OSM_LUT_ROW_SIZE,
	.reg_freq_lut = OSM_REG_FREQ_LUT,
	.reg_perf_state = OSM_REG_PERF_STATE,
	};

	DEFINE_QNODE(sm8150_osm_apps_l3, SM8150_MASTER_OSM_L3_APPS, 32, SM8150_SLAVE_OSM_L3);
	DEFINE_QNODE(sm8150_osm_l3, SM8150_SLAVE_OSM_L3, 32);

	static const struct qcom_osm_l3_node * const sm8150_osm_l3_nodes[] = {
	[MASTER_OSM_L3_APPS] = &sm8150_osm_apps_l3,
	[SLAVE_OSM_L3] = &sm8150_osm_l3,
	};

	static const struct qcom_osm_l3_desc sm8150_icc_osm_l3 = {
	.nodes = sm8150_osm_l3_nodes,
	.num_nodes = ARRAY_SIZE(sm8150_osm_l3_nodes),
	.lut_row_size = OSM_LUT_ROW_SIZE,
	.reg_freq_lut = OSM_REG_FREQ_LUT,
	.reg_perf_state = OSM_REG_PERF_STATE,
	};

	DEFINE_QNODE(sm8250_epss_apps_l3, SM8250_MASTER_EPSS_L3_APPS, 32, SM8250_SLAVE_EPSS_L3);
	DEFINE_QNODE(sm8250_epss_l3, SM8250_SLAVE_EPSS_L3, 32);

	static const struct qcom_osm_l3_node * const sm8250_epss_l3_nodes[] = {
	[MASTER_EPSS_L3_APPS] = &sm8250_epss_apps_l3,
	[SLAVE_EPSS_L3_SHARED] = &sm8250_epss_l3,
	};

	static const struct qcom_osm_l3_desc sm8250_icc_epss_l3 = {
	.nodes = sm8250_epss_l3_nodes,
	.num_nodes = ARRAY_SIZE(sm8250_epss_l3_nodes),
	.lut_row_size = EPSS_LUT_ROW_SIZE,
	.reg_freq_lut = EPSS_REG_FREQ_LUT,
	.reg_perf_state = EPSS_REG_PERF_STATE,
	};

	static int qcom_osm_l3_set(struct icc_node src, struct icc_node dst)
	{
	struct qcom_osm_l3_icc_provider *qp;
	struct icc_provider *provider;
	const struct qcom_osm_l3_node *qn;
	struct icc_node *n;
	unsigned int index;
	u32 agg_peak = 0;
	u32 agg_avg = 0;
	u64 rate;

	qn = src->data;
	provider = src->provider;
	qp = to_osm_l3_provider(provider);

	list_for_each_entry(n, &provider->nodes, node_list)
	provider->aggregate(n, 0, n->avg_bw, n->peak_bw,
	&agg_avg, &agg_peak);

	rate = max(agg_avg, agg_peak);
	rate = icc_units_to_bps(rate);
	do_div(rate, qn->buswidth);

	for (index = 0; index < qp->max_state - 1; index++) {
	if (qp->lut_tables[index] >= rate)
	break;
	}

	writel_relaxed(index, qp->base + qp->reg_perf_state);

	return 0;
	}

	static int qcom_osm_l3_remove(struct platform_device *pdev)
	{
	struct qcom_osm_l3_icc_provider *qp = platform_get_drvdata(pdev);

	icc_provider_deregister(&qp->provider);
	icc_nodes_remove(&qp->provider);

	return 0;
	}

	static int qcom_osm_l3_probe(struct platform_device *pdev)
	{
	u32 info, src, lval, i, prev_freq = 0, freq;
	static unsigned long hw_rate, xo_rate;
	struct qcom_osm_l3_icc_provider *qp;
	const struct qcom_osm_l3_desc *desc;
	struct icc_onecell_data *data;
	struct icc_provider *provider;
	const struct qcom_osm_l3_node * const *qnodes;
	struct icc_node *node;
	size_t num_nodes;
	struct clk *clk;
	int ret;

	clk = clk_get(&pdev->dev, "xo");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	xo_rate = clk_get_rate(clk);
	clk_put(clk);

	clk = clk_get(&pdev->dev, "alternate");
	if (IS_ERR(clk))
	return PTR_ERR(clk);

	hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
	clk_put(clk);

	qp = devm_kzalloc(&pdev->dev, sizeof(*qp), GFP_KERNEL);
	if (!qp)
	return -ENOMEM;

	qp->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(qp->base))
	return PTR_ERR(qp->base);

	/* HW should be in enabled state to proceed */
	if (!(readl_relaxed(qp->base + REG_ENABLE) & 0x1)) {
	dev_err(&pdev->dev, "error hardware not enabled\n");
	return -ENODEV;
	}

	desc = device_get_match_data(&pdev->dev);
	if (!desc)
	return -EINVAL;

	qp->reg_perf_state = desc->reg_perf_state;

	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
	info = readl_relaxed(qp->base + desc->reg_freq_lut +
	i * desc->lut_row_size);
	src = FIELD_GET(LUT_SRC, info);
	lval = FIELD_GET(LUT_L_VAL, info);
	if (src)
	freq = xo_rate * lval;
	else
	freq = hw_rate;

	/* Two of the same frequencies signify end of table */
	if (i > 0 && prev_freq == freq)
	break;

	dev_dbg(&pdev->dev, "index=%d freq=%d\n", i, freq);

	qp->lut_tables[i] = freq;
	prev_freq = freq;
	}
	qp->max_state = i;

	qnodes = desc->nodes;
	num_nodes = desc->num_nodes;

	data = devm_kzalloc(&pdev->dev, struct_size(data, nodes, num_nodes), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	provider = &qp->provider;
	provider->dev = &pdev->dev;
	provider->set = qcom_osm_l3_set;
	provider->aggregate = icc_std_aggregate;
	provider->xlate = of_icc_xlate_onecell;
	provider->data = data;

	icc_provider_init(provider);

	for (i = 0; i < num_nodes; i++) {
	size_t j;

	node = icc_node_create(qnodes[i]->id);
	if (IS_ERR(node)) {
	ret = PTR_ERR(node);
	goto err;
	}

	node->name = qnodes[i]->name;
	/* Cast away const and add it back in qcom_osm_l3_set() */
	node->data = (void *)qnodes[i];
	icc_node_add(node, provider);

	for (j = 0; j < qnodes[i]->num_links; j++)
	icc_link_create(node, qnodes[i]->links[j]);

	data->nodes[i] = node;
	}
	data->num_nodes = num_nodes;

	ret = icc_provider_register(provider);
	if (ret)
	goto err;

	platform_set_drvdata(pdev, qp);

	return 0;
	err:
	icc_nodes_remove(provider);

	return ret;
	}

	static const struct of_device_id osm_l3_of_match[] = {
	{ .compatible = "qcom,sc7180-osm-l3", .data = &sc7180_icc_osm_l3 },
	{ .compatible = "qcom,sc7280-epss-l3", .data = &sc7280_icc_epss_l3 },
	{ .compatible = "qcom,sdm845-osm-l3", .data = &sdm845_icc_osm_l3 },
	{ .compatible = "qcom,sm8150-osm-l3", .data = &sm8150_icc_osm_l3 },
	{ .compatible = "qcom,sc8180x-osm-l3", .data = &sc8180x_icc_osm_l3 },
	{ .compatible = "qcom,sm8250-epss-l3", .data = &sm8250_icc_epss_l3 },
	{ }
	};
	MODULE_DEVICE_TABLE(of, osm_l3_of_match);

	static struct platform_driver osm_l3_driver = {
	.probe = qcom_osm_l3_probe,
	.remove = qcom_osm_l3_remove,
	.driver = {
	.name = "osm-l3",
	.of_match_table = osm_l3_of_match,
	.sync_state = icc_sync_state,
	},
	};
	module_platform_driver(osm_l3_driver);

	MODULE_DESCRIPTION("Qualcomm OSM L3 interconnect driver");
	MODULE_LICENSE("GPL v2");