interconnect: Add imx core driver (f0d80485) · Commits · 戴 / test

drivers/interconnect/Kconfig

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Original line number	Diff line number	Diff line
		@@ -11,6 +11,7 @@ menuconfig INTERCONNECT

		if INTERCONNECT

		source "drivers/interconnect/imx/Kconfig"
		source "drivers/interconnect/qcom/Kconfig"

		endif

drivers/interconnect/Makefile

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Original line number	Diff line number	Diff line
		@@ -4,4 +4,5 @@ CFLAGS_core.o := -I$(src)
		icc-core-objs := core.o

		obj-$(CONFIG_INTERCONNECT) += icc-core.o
		obj-$(CONFIG_INTERCONNECT_IMX) += imx/
		obj-$(CONFIG_INTERCONNECT_QCOM) += qcom/

drivers/interconnect/imx/Kconfig

0 → 100644

+5 −0

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		config INTERCONNECT_IMX
		tristate "i.MX interconnect drivers"
		depends on ARCH_MXC \|\| COMPILE_TEST
		help
		Generic interconnect drivers for i.MX SOCs

drivers/interconnect/imx/Makefile

0 → 100644

+3 −0

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		imx-interconnect-objs := imx.o

		obj-$(CONFIG_INTERCONNECT_IMX) += imx-interconnect.o

drivers/interconnect/imx/imx.c

0 → 100644

+284 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Interconnect framework driver for i.MX SoC
		*
		* Copyright (c) 2019, BayLibre
		* Copyright (c) 2019-2020, NXP
		* Author: Alexandre Bailon <abailon@baylibre.com>
		* Author: Leonard Crestez <leonard.crestez@nxp.com>
		*/

		#include <linux/device.h>
		#include <linux/interconnect-provider.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_platform.h>
		#include <linux/platform_device.h>
		#include <linux/pm_qos.h>

		#include "imx.h"

		/* private icc_node data */
		struct imx_icc_node {
		const struct imx_icc_node_desc *desc;
		struct device *qos_dev;
		struct dev_pm_qos_request qos_req;
		};

		static int imx_icc_node_set(struct icc_node *node)
		{
		struct device *dev = node->provider->dev;
		struct imx_icc_node *node_data = node->data;
		u64 freq;

		if (!node_data->qos_dev)
		return 0;

		freq = (node->avg_bw + node->peak_bw) * node_data->desc->adj->bw_mul;
		do_div(freq, node_data->desc->adj->bw_div);
		dev_dbg(dev, "node %s device %s avg_bw %ukBps peak_bw %ukBps min_freq %llukHz\n",
		node->name, dev_name(node_data->qos_dev),
		node->avg_bw, node->peak_bw, freq);

		if (freq > S32_MAX) {
		dev_err(dev, "%s can't request more than S32_MAX freq\n",
		node->name);
		return -ERANGE;
		}

		dev_pm_qos_update_request(&node_data->qos_req, freq);

		return 0;
		}

		static int imx_icc_set(struct icc_node src, struct icc_node dst)
		{
		return imx_icc_node_set(dst);
		}

		/* imx_icc_node_destroy() - Destroy an imx icc_node, including private data */
		static void imx_icc_node_destroy(struct icc_node *node)
		{
		struct imx_icc_node *node_data = node->data;
		int ret;

		if (dev_pm_qos_request_active(&node_data->qos_req)) {
		ret = dev_pm_qos_remove_request(&node_data->qos_req);
		if (ret)
		dev_warn(node->provider->dev,
		"failed to remove qos request for %s\n",
		dev_name(node_data->qos_dev));
		}

		put_device(node_data->qos_dev);
		icc_node_del(node);
		icc_node_destroy(node->id);
		}

		static int imx_icc_node_init_qos(struct icc_provider *provider,
		struct icc_node *node)
		{
		struct imx_icc_node *node_data = node->data;
		const struct imx_icc_node_adj_desc *adj = node_data->desc->adj;
		struct device *dev = provider->dev;
		struct device_node *dn = NULL;
		struct platform_device *pdev;

		if (adj->main_noc) {
		node_data->qos_dev = dev;
		dev_dbg(dev, "icc node %s[%d] is main noc itself\n",
		node->name, node->id);
		} else {
		dn = of_parse_phandle(dev->of_node, adj->phandle_name, 0);
		if (IS_ERR(dn)) {
		dev_warn(dev, "Failed to parse %s: %ld\n",
		adj->phandle_name, PTR_ERR(dn));
		return PTR_ERR(dn);
		}
		/* Allow scaling to be disabled on a per-node basis */
		if (!dn \|\| !of_device_is_available(dn)) {
		dev_warn(dev, "Missing property %s, skip scaling %s\n",
		adj->phandle_name, node->name);
		return 0;
		}

		pdev = of_find_device_by_node(dn);
		of_node_put(dn);
		if (!pdev) {
		dev_warn(dev, "node %s[%d] missing device for %pOF\n",
		node->name, node->id, dn);
		return -EPROBE_DEFER;
		}
		node_data->qos_dev = &pdev->dev;
		dev_dbg(dev, "node %s[%d] has device node %pOF\n",
		node->name, node->id, dn);
		}

		return dev_pm_qos_add_request(node_data->qos_dev,
		&node_data->qos_req,
		DEV_PM_QOS_MIN_FREQUENCY, 0);
		}

		static struct icc_node imx_icc_node_add(struct icc_provider provider,
		const struct imx_icc_node_desc *node_desc)
		{
		struct device *dev = provider->dev;
		struct imx_icc_node *node_data;
		struct icc_node *node;
		int ret;

		node = icc_node_create(node_desc->id);
		if (IS_ERR(node)) {
		dev_err(dev, "failed to create node %d\n", node_desc->id);
		return node;
		}

		if (node->data) {
		dev_err(dev, "already created node %s id=%d\n",
		node_desc->name, node_desc->id);
		return ERR_PTR(-EEXIST);
		}

		node_data = devm_kzalloc(dev, sizeof(*node_data), GFP_KERNEL);
		if (!node_data) {
		icc_node_destroy(node->id);
		return ERR_PTR(-ENOMEM);
		}

		node->name = node_desc->name;
		node->data = node_data;
		node_data->desc = node_desc;
		icc_node_add(node, provider);

		if (node_desc->adj) {
		ret = imx_icc_node_init_qos(provider, node);
		if (ret < 0) {
		imx_icc_node_destroy(node);
		return ERR_PTR(ret);
		}
		}

		return node;
		}

		static void imx_icc_unregister_nodes(struct icc_provider *provider)
		{
		struct icc_node node, tmp;

		list_for_each_entry_safe(node, tmp, &provider->nodes, node_list)
		imx_icc_node_destroy(node);
		}

		static int imx_icc_register_nodes(struct icc_provider *provider,
		const struct imx_icc_node_desc *descs,
		int count)
		{
		struct icc_onecell_data *provider_data = provider->data;
		int ret;
		int i;

		for (i = 0; i < count; i++) {
		struct icc_node *node;
		const struct imx_icc_node_desc *node_desc = &descs[i];
		size_t j;

		node = imx_icc_node_add(provider, node_desc);
		if (IS_ERR(node)) {
		ret = PTR_ERR(node);
		if (ret != -EPROBE_DEFER)
		dev_err(provider->dev, "failed to add %s: %d\n",
		node_desc->name, ret);
		goto err;
		}
		provider_data->nodes[node->id] = node;

		for (j = 0; j < node_desc->num_links; j++) {
		ret = icc_link_create(node, node_desc->links[j]);
		if (ret) {
		dev_err(provider->dev, "failed to link node %d to %d: %d\n",
		node->id, node_desc->links[j], ret);
		goto err;
		}
		}
		}

		return 0;

		err:
		imx_icc_unregister_nodes(provider);

		return ret;
		}

		static int get_max_node_id(struct imx_icc_node_desc *nodes, int nodes_count)
		{
		int i, ret = 0;

		for (i = 0; i < nodes_count; ++i)
		if (nodes[i].id > ret)
		ret = nodes[i].id;

		return ret;
		}

		int imx_icc_register(struct platform_device *pdev,
		struct imx_icc_node_desc *nodes, int nodes_count)
		{
		struct device *dev = &pdev->dev;
		struct icc_onecell_data *data;
		struct icc_provider *provider;
		int max_node_id;
		int ret;

		/* icc_onecell_data is indexed by node_id, unlike nodes param */
		max_node_id = get_max_node_id(nodes, nodes_count);
		data = devm_kzalloc(dev, struct_size(data, nodes, max_node_id),
		GFP_KERNEL);
		if (!data)
		return -ENOMEM;
		data->num_nodes = max_node_id;

		provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
		if (!provider)
		return -ENOMEM;
		provider->set = imx_icc_set;
		provider->aggregate = icc_std_aggregate;
		provider->xlate = of_icc_xlate_onecell;
		provider->data = data;
		provider->dev = dev->parent;
		platform_set_drvdata(pdev, provider);

		ret = icc_provider_add(provider);
		if (ret) {
		dev_err(dev, "error adding interconnect provider: %d\n", ret);
		return ret;
		}

		ret = imx_icc_register_nodes(provider, nodes, nodes_count);
		if (ret)
		goto provider_del;

		return 0;

		provider_del:
		icc_provider_del(provider);
		return ret;
		}
		EXPORT_SYMBOL_GPL(imx_icc_register);

		int imx_icc_unregister(struct platform_device *pdev)
		{
		struct icc_provider *provider = platform_get_drvdata(pdev);
		int ret;

		imx_icc_unregister_nodes(provider);

		ret = icc_provider_del(provider);
		if (ret)
		return ret;

		return 0;
		}
		EXPORT_SYMBOL_GPL(imx_icc_unregister);

		MODULE_LICENSE("GPL v2");

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