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199 lines
4.9 KiB
199 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Exynos generic interconnect provider driver |
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* |
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* Copyright (c) 2020 Samsung Electronics Co., Ltd. |
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* |
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* Authors: Artur Świgoń <[email protected]> |
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* Sylwester Nawrocki <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/interconnect-provider.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_qos.h> |
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#include <linux/slab.h> |
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#define EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO 8 |
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struct exynos_icc_priv { |
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struct device *dev; |
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/* One interconnect node per provider */ |
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struct icc_provider provider; |
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struct icc_node *node; |
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struct dev_pm_qos_request qos_req; |
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u32 bus_clk_ratio; |
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}; |
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static struct icc_node *exynos_icc_get_parent(struct device_node *np) |
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{ |
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struct of_phandle_args args; |
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struct icc_node_data *icc_node_data; |
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struct icc_node *icc_node; |
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int num, ret; |
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num = of_count_phandle_with_args(np, "interconnects", |
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"#interconnect-cells"); |
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if (num < 1) |
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return NULL; /* parent nodes are optional */ |
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/* Get the interconnect target node */ |
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ret = of_parse_phandle_with_args(np, "interconnects", |
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"#interconnect-cells", 0, &args); |
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if (ret < 0) |
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return ERR_PTR(ret); |
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icc_node_data = of_icc_get_from_provider(&args); |
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of_node_put(args.np); |
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if (IS_ERR(icc_node_data)) |
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return ERR_CAST(icc_node_data); |
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icc_node = icc_node_data->node; |
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kfree(icc_node_data); |
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return icc_node; |
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} |
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static int exynos_generic_icc_set(struct icc_node *src, struct icc_node *dst) |
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{ |
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struct exynos_icc_priv *src_priv = src->data, *dst_priv = dst->data; |
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s32 src_freq = max(src->avg_bw, src->peak_bw) / src_priv->bus_clk_ratio; |
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s32 dst_freq = max(dst->avg_bw, dst->peak_bw) / dst_priv->bus_clk_ratio; |
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int ret; |
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ret = dev_pm_qos_update_request(&src_priv->qos_req, src_freq); |
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if (ret < 0) { |
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dev_err(src_priv->dev, "failed to update PM QoS of %s (src)\n", |
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src->name); |
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return ret; |
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} |
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ret = dev_pm_qos_update_request(&dst_priv->qos_req, dst_freq); |
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if (ret < 0) { |
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dev_err(dst_priv->dev, "failed to update PM QoS of %s (dst)\n", |
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dst->name); |
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return ret; |
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} |
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return 0; |
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} |
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static struct icc_node *exynos_generic_icc_xlate(struct of_phandle_args *spec, |
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void *data) |
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{ |
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struct exynos_icc_priv *priv = data; |
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if (spec->np != priv->dev->parent->of_node) |
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return ERR_PTR(-EINVAL); |
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return priv->node; |
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} |
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static int exynos_generic_icc_remove(struct platform_device *pdev) |
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{ |
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struct exynos_icc_priv *priv = platform_get_drvdata(pdev); |
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struct icc_node *parent_node, *node = priv->node; |
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parent_node = exynos_icc_get_parent(priv->dev->parent->of_node); |
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if (parent_node && !IS_ERR(parent_node)) |
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icc_link_destroy(node, parent_node); |
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icc_nodes_remove(&priv->provider); |
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icc_provider_del(&priv->provider); |
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return 0; |
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} |
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static int exynos_generic_icc_probe(struct platform_device *pdev) |
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{ |
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struct device *bus_dev = pdev->dev.parent; |
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struct exynos_icc_priv *priv; |
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struct icc_provider *provider; |
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struct icc_node *icc_node, *icc_parent_node; |
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int ret; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->dev = &pdev->dev; |
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platform_set_drvdata(pdev, priv); |
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provider = &priv->provider; |
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provider->set = exynos_generic_icc_set; |
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provider->aggregate = icc_std_aggregate; |
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provider->xlate = exynos_generic_icc_xlate; |
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provider->dev = bus_dev; |
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provider->inter_set = true; |
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provider->data = priv; |
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ret = icc_provider_add(provider); |
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if (ret < 0) |
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return ret; |
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icc_node = icc_node_create(pdev->id); |
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if (IS_ERR(icc_node)) { |
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ret = PTR_ERR(icc_node); |
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goto err_prov_del; |
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} |
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priv->node = icc_node; |
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icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", |
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bus_dev->of_node); |
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if (of_property_read_u32(bus_dev->of_node, "samsung,data-clock-ratio", |
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&priv->bus_clk_ratio)) |
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priv->bus_clk_ratio = EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO; |
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/* |
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* Register a PM QoS request for the parent (devfreq) device. |
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*/ |
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ret = dev_pm_qos_add_request(bus_dev, &priv->qos_req, |
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DEV_PM_QOS_MIN_FREQUENCY, 0); |
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if (ret < 0) |
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goto err_node_del; |
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icc_node->data = priv; |
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icc_node_add(icc_node, provider); |
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icc_parent_node = exynos_icc_get_parent(bus_dev->of_node); |
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if (IS_ERR(icc_parent_node)) { |
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ret = PTR_ERR(icc_parent_node); |
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goto err_pmqos_del; |
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} |
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if (icc_parent_node) { |
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ret = icc_link_create(icc_node, icc_parent_node->id); |
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if (ret < 0) |
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goto err_pmqos_del; |
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} |
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return 0; |
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err_pmqos_del: |
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dev_pm_qos_remove_request(&priv->qos_req); |
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err_node_del: |
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icc_nodes_remove(provider); |
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err_prov_del: |
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icc_provider_del(provider); |
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return ret; |
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} |
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static struct platform_driver exynos_generic_icc_driver = { |
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.driver = { |
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.name = "exynos-generic-icc", |
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.sync_state = icc_sync_state, |
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}, |
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.probe = exynos_generic_icc_probe, |
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.remove = exynos_generic_icc_remove, |
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}; |
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module_platform_driver(exynos_generic_icc_driver); |
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MODULE_DESCRIPTION("Exynos generic interconnect driver"); |
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MODULE_AUTHOR("Artur Świgoń <[email protected]>"); |
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MODULE_AUTHOR("Sylwester Nawrocki <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:exynos-generic-icc");
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