118 lines
2.6 KiB
C
118 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2022 MediaTek Inc.
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*/
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/soc/mediatek/mtk-pm-qos.h>
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static struct mtk_pm_qos_request boost_ddr_opp_req;
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struct mtk_dvfsrc_boost {
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struct device *dev;
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int perf_state;
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};
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static ssize_t dramboost_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int val = 0;
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struct mtk_dvfsrc_boost *boost = dev_get_drvdata(dev);
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if (kstrtoint(buf, 10, &val))
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return -EINVAL;
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if (val == 1)
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mtk_pm_qos_update_request(&boost_ddr_opp_req,
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boost->perf_state);
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else
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mtk_pm_qos_update_request(&boost_ddr_opp_req,
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MTK_PM_QOS_DDR_OPP_DEFAULT_VALUE);
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return count;
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}
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static DEVICE_ATTR_WO(dramboost);
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static struct attribute *dvfsrc_boost_attributes[] = {
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&dev_attr_dramboost.attr,
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NULL,
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};
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static struct attribute_group dvfsrc_boost_attr_group = {
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.name = "dramboost",
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.attrs = dvfsrc_boost_attributes,
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};
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static int mtk_dvfsrc_boost_probe(struct platform_device *pdev)
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{
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struct mtk_dvfsrc_boost *dramboost;
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struct device *dev = &pdev->dev;
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struct device_node *node = pdev->dev.of_node;
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int result;
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dramboost = devm_kzalloc(dev, sizeof(*dramboost), GFP_KERNEL);
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if (!dramboost)
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return -ENOMEM;
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if (of_property_read_u32(node, "boost_opp",
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(u32 *) &dramboost->perf_state))
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dramboost->perf_state = 0;
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if (dramboost->perf_state < 0)
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return -EINVAL;
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dramboost->dev = dev;
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platform_set_drvdata(pdev, dramboost);
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mtk_pm_qos_add_request(&boost_ddr_opp_req, MTK_PM_QOS_DDR_OPP,
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MTK_PM_QOS_DDR_OPP_DEFAULT_VALUE);
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result = sysfs_create_group(&dev->kobj, &dvfsrc_boost_attr_group);
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return result;
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}
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static int mtk_dvfsrc_boost_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct of_device_id mtk_dvfsrc_boost_of_match[] = {
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{
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.compatible = "mediatek,dvfsrc-boost",
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}, {
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/* sentinel */
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},
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};
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static struct platform_driver mtk_dvfsrc_boost_driver = {
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.probe = mtk_dvfsrc_boost_probe,
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.remove = mtk_dvfsrc_boost_remove,
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.driver = {
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.name = "mtk-dvfsrc-boost",
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.of_match_table = of_match_ptr(mtk_dvfsrc_boost_of_match),
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},
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};
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static int __init mtk_dvfsrc_boost_init(void)
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{
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return platform_driver_register(&mtk_dvfsrc_boost_driver);
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}
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late_initcall(mtk_dvfsrc_boost_init)
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static void __exit mtk_dvfsrc_boost_exit(void)
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{
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platform_driver_unregister(&mtk_dvfsrc_boost_driver);
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}
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module_exit(mtk_dvfsrc_boost_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("MTK dvfsrc boost driver");
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