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859ad5f177
There is no longer any need to explicitly destroy node links as this is now done when the node is destroyed as part of icc_nodes_remove(). Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Link: https://lore.kernel.org/r/20230306075651.2449-17-johan+linaro@kernel.org Signed-off-by: Georgi Djakov <djakov@kernel.org>
194 lines
4.7 KiB
C
194 lines
4.7 KiB
C
// 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 <a.swigon@samsung.com>
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* Sylwester Nawrocki <s.nawrocki@samsung.com>
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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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icc_provider_deregister(&priv->provider);
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icc_nodes_remove(&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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icc_provider_init(provider);
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icc_node = icc_node_create(pdev->id);
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if (IS_ERR(icc_node))
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return PTR_ERR(icc_node);
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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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icc_node->data = priv;
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icc_node_add(icc_node, provider);
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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_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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ret = icc_provider_register(provider);
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if (ret < 0)
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goto err_pmqos_del;
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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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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 <a.swigon@samsung.com>");
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MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:exynos-generic-icc");
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