1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
5  * Description: CoreSight Trace Port Interface Unit driver
12 #include <linux/coresight.h>
22 #include "coresight-priv.h"
45 /* FFSR - 0x300 */
47 /* FFCR - 0x304 */
52 DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
56  * @atclk:	optional clock for the core parts of the TPIU.
70 	CS_UNLOCK(csa->base);  in tpiu_enable_hw()
74 	CS_LOCK(csa->base);  in tpiu_enable_hw()
80 	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);  in tpiu_enable()
82 	guard(spinlock)(&drvdata->spinlock);  in tpiu_enable()
83 	tpiu_enable_hw(&csdev->access);  in tpiu_enable()
84 	csdev->refcnt++;  in tpiu_enable()
85 	dev_dbg(&csdev->dev, "TPIU enabled\n");  in tpiu_enable()
91 	CS_UNLOCK(csa->base);  in tpiu_disable_hw()
102 	CS_LOCK(csa->base);  in tpiu_disable_hw()
107 	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);  in tpiu_disable()
109 	guard(spinlock)(&drvdata->spinlock);  in tpiu_disable()
110 	csdev->refcnt--;  in tpiu_disable()
111 	if (csdev->refcnt)  in tpiu_disable()
112 		return -EBUSY;  in tpiu_disable()
114 	tpiu_disable_hw(&csdev->access);  in tpiu_disable()
116 	dev_dbg(&csdev->dev, "TPIU disabled\n");  in tpiu_disable()
139 		return -ENOMEM;  in __tpiu_probe()
143 		return -ENOMEM;  in __tpiu_probe()
145 	spin_lock_init(&drvdata->spinlock);  in __tpiu_probe()
147 	drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */  in __tpiu_probe()
148 	if (!IS_ERR(drvdata->atclk)) {  in __tpiu_probe()
149 		ret = clk_prepare_enable(drvdata->atclk);  in __tpiu_probe()
154 	drvdata->pclk = coresight_get_enable_apb_pclk(dev);  in __tpiu_probe()
155 	if (IS_ERR(drvdata->pclk))  in __tpiu_probe()
156 		return -ENODEV;  in __tpiu_probe()
164 	drvdata->base = base;  in __tpiu_probe()
167 	/* Disable tpiu to support older devices */  in __tpiu_probe()
173 	dev->platform_data = pdata;  in __tpiu_probe()
180 	drvdata->csdev = coresight_register(&desc);  in __tpiu_probe()
182 	if (!IS_ERR(drvdata->csdev))  in __tpiu_probe()
185 	return PTR_ERR(drvdata->csdev);  in __tpiu_probe()
192 	ret = __tpiu_probe(&adev->dev, &adev->res);  in tpiu_probe()
194 		pm_runtime_put(&adev->dev);  in tpiu_probe()
202 	coresight_unregister(drvdata->csdev);  in __tpiu_remove()
207 	__tpiu_remove(&adev->dev);  in tpiu_remove()
215 	if (drvdata && !IS_ERR(drvdata->atclk))  in tpiu_runtime_suspend()
216 		clk_disable_unprepare(drvdata->atclk);  in tpiu_runtime_suspend()
218 	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))  in tpiu_runtime_suspend()
219 		clk_disable_unprepare(drvdata->pclk);  in tpiu_runtime_suspend()
227 	if (drvdata && !IS_ERR(drvdata->atclk))  in tpiu_runtime_resume()
228 		clk_prepare_enable(drvdata->atclk);  in tpiu_runtime_resume()
230 	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))  in tpiu_runtime_resume()
231 		clk_prepare_enable(drvdata->pclk);  in tpiu_runtime_resume()
250 		/* Coresight SoC-600 */
261 		.name	= "coresight-tpiu",
275 	pm_runtime_get_noresume(&pdev->dev);  in tpiu_platform_probe()
276 	pm_runtime_set_active(&pdev->dev);  in tpiu_platform_probe()
277 	pm_runtime_enable(&pdev->dev);  in tpiu_platform_probe()
279 	ret = __tpiu_probe(&pdev->dev, res);  in tpiu_platform_probe()
280 	pm_runtime_put(&pdev->dev);  in tpiu_platform_probe()
282 		pm_runtime_disable(&pdev->dev);  in tpiu_platform_probe()
289 	struct tpiu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);  in tpiu_platform_remove()
294 	__tpiu_remove(&pdev->dev);  in tpiu_platform_remove()
295 	pm_runtime_disable(&pdev->dev);  in tpiu_platform_remove()
296 	if (!IS_ERR_OR_NULL(drvdata->pclk))  in tpiu_platform_remove()
297 		clk_put(drvdata->pclk);  in tpiu_platform_remove()
302 	{"ARMHC979", 0, 0, 0}, /* ARM CoreSight TPIU */
312 		.name			= "coresight-tpiu-platform",
321 	return coresight_init_driver("tpiu", &tpiu_driver, &tpiu_platform_driver);  in tpiu_init()
333 MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");