| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. |
| * |
| * Description: CoreSight Replicator driver |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/clk.h> |
| #include <linux/of.h> |
| #include <linux/coresight.h> |
| |
| #include "coresight-priv.h" |
| |
| /** |
| * struct replicator_drvdata - specifics associated to a replicator component |
| * @dev: the device entity associated with this component |
| * @atclk: optional clock for the core parts of the replicator. |
| * @csdev: component vitals needed by the framework |
| */ |
| struct replicator_drvdata { |
| struct device *dev; |
| struct clk *atclk; |
| struct coresight_device *csdev; |
| }; |
| |
| static int replicator_enable(struct coresight_device *csdev, int inport, |
| int outport) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_dbg(drvdata->dev, "REPLICATOR enabled\n"); |
| return 0; |
| } |
| |
| static void replicator_disable(struct coresight_device *csdev, int inport, |
| int outport) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_dbg(drvdata->dev, "REPLICATOR disabled\n"); |
| } |
| |
| static const struct coresight_ops_link replicator_link_ops = { |
| .enable = replicator_enable, |
| .disable = replicator_disable, |
| }; |
| |
| static const struct coresight_ops replicator_cs_ops = { |
| .link_ops = &replicator_link_ops, |
| }; |
| |
| static int replicator_probe(struct platform_device *pdev) |
| { |
| int ret; |
| struct device *dev = &pdev->dev; |
| struct coresight_platform_data *pdata = NULL; |
| struct replicator_drvdata *drvdata; |
| struct coresight_desc desc = { 0 }; |
| struct device_node *np = pdev->dev.of_node; |
| |
| if (np) { |
| pdata = of_get_coresight_platform_data(dev, np); |
| if (IS_ERR(pdata)) |
| return PTR_ERR(pdata); |
| pdev->dev.platform_data = pdata; |
| } |
| |
| drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| if (!drvdata) |
| return -ENOMEM; |
| |
| drvdata->dev = &pdev->dev; |
| drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */ |
| if (!IS_ERR(drvdata->atclk)) { |
| ret = clk_prepare_enable(drvdata->atclk); |
| if (ret) |
| return ret; |
| } |
| pm_runtime_get_noresume(&pdev->dev); |
| pm_runtime_set_active(&pdev->dev); |
| pm_runtime_enable(&pdev->dev); |
| platform_set_drvdata(pdev, drvdata); |
| |
| desc.type = CORESIGHT_DEV_TYPE_LINK; |
| desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; |
| desc.ops = &replicator_cs_ops; |
| desc.pdata = pdev->dev.platform_data; |
| desc.dev = &pdev->dev; |
| drvdata->csdev = coresight_register(&desc); |
| if (IS_ERR(drvdata->csdev)) { |
| ret = PTR_ERR(drvdata->csdev); |
| goto out_disable_pm; |
| } |
| |
| pm_runtime_put(&pdev->dev); |
| |
| return 0; |
| |
| out_disable_pm: |
| if (!IS_ERR(drvdata->atclk)) |
| clk_disable_unprepare(drvdata->atclk); |
| pm_runtime_put_noidle(&pdev->dev); |
| pm_runtime_disable(&pdev->dev); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_PM |
| static int replicator_runtime_suspend(struct device *dev) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata && !IS_ERR(drvdata->atclk)) |
| clk_disable_unprepare(drvdata->atclk); |
| |
| return 0; |
| } |
| |
| static int replicator_runtime_resume(struct device *dev) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(dev); |
| |
| if (drvdata && !IS_ERR(drvdata->atclk)) |
| clk_prepare_enable(drvdata->atclk); |
| |
| return 0; |
| } |
| #endif |
| |
| static const struct dev_pm_ops replicator_dev_pm_ops = { |
| SET_RUNTIME_PM_OPS(replicator_runtime_suspend, |
| replicator_runtime_resume, NULL) |
| }; |
| |
| static const struct of_device_id replicator_match[] = { |
| {.compatible = "arm,coresight-replicator"}, |
| {} |
| }; |
| |
| static struct platform_driver replicator_driver = { |
| .probe = replicator_probe, |
| .driver = { |
| .name = "coresight-replicator", |
| .of_match_table = replicator_match, |
| .pm = &replicator_dev_pm_ops, |
| .suppress_bind_attrs = true, |
| }, |
| }; |
| builtin_platform_driver(replicator_driver); |