coresight-tpiu.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
  4 *
  5 * Description: CoreSight Trace Port Interface Unit driver
  6 */
  7
  8#include <linux/acpi.h>
  9#include <linux/amba/bus.h>
 10#include <linux/atomic.h>
 11#include <linux/clk.h>
 12#include <linux/coresight.h>
 13#include <linux/device.h>
 14#include <linux/err.h>
 15#include <linux/init.h>
 16#include <linux/io.h>
 17#include <linux/kernel.h>
 18#include <linux/platform_device.h>
 19#include <linux/pm_runtime.h>
 20#include <linux/slab.h>
 21
 22#include "coresight-priv.h"
 23
 24#define TPIU_SUPP_PORTSZ	0x000
 25#define TPIU_CURR_PORTSZ	0x004
 26#define TPIU_SUPP_TRIGMODES	0x100
 27#define TPIU_TRIG_CNTRVAL	0x104
 28#define TPIU_TRIG_MULT		0x108
 29#define TPIU_SUPP_TESTPATM	0x200
 30#define TPIU_CURR_TESTPATM	0x204
 31#define TPIU_TEST_PATREPCNTR	0x208
 32#define TPIU_FFSR		0x300
 33#define TPIU_FFCR		0x304
 34#define TPIU_FSYNC_CNTR		0x308
 35#define TPIU_EXTCTL_INPORT	0x400
 36#define TPIU_EXTCTL_OUTPORT	0x404
 37#define TPIU_ITTRFLINACK	0xee4
 38#define TPIU_ITTRFLIN		0xee8
 39#define TPIU_ITATBDATA0		0xeec
 40#define TPIU_ITATBCTR2		0xef0
 41#define TPIU_ITATBCTR1		0xef4
 42#define TPIU_ITATBCTR0		0xef8
 43
 44/** register definition **/
 45/* FFSR - 0x300 */
 46#define FFSR_FT_STOPPED_BIT	1
 47/* FFCR - 0x304 */
 48#define FFCR_FON_MAN_BIT	6
 49#define FFCR_FON_MAN		BIT(6)
 50#define FFCR_STOP_FI		BIT(12)
 51
 52DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
 53
 54/*
 55 * @base:	memory mapped base address for this component.
 56 * @atclk:	optional clock for the core parts of the TPIU.
 57 * @pclk:	APB clock if present, otherwise NULL
 58 * @csdev:	component vitals needed by the framework.
 59 */
 60struct tpiu_drvdata {
 61	void __iomem		*base;
 62	struct clk		*atclk;
 63	struct clk		*pclk;
 64	struct coresight_device	*csdev;
 65	spinlock_t		spinlock;
 66};
 67
 68static void tpiu_enable_hw(struct csdev_access *csa)
 69{
 70	CS_UNLOCK(csa->base);
 71
 72	/* TODO: fill this up */
 73
 74	CS_LOCK(csa->base);
 75}
 76
 77static int tpiu_enable(struct coresight_device *csdev, enum cs_mode mode,
 78		       struct coresight_path *path)
 79{
 80	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 81
 82	guard(spinlock)(&drvdata->spinlock);
 83	tpiu_enable_hw(&csdev->access);
 84	csdev->refcnt++;
 85	dev_dbg(&csdev->dev, "TPIU enabled\n");
 86	return 0;
 87}
 88
 89static void tpiu_disable_hw(struct csdev_access *csa)
 90{
 91	CS_UNLOCK(csa->base);
 92
 93	/* Clear formatter and stop on flush */
 94	csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
 95	/* Generate manual flush */
 96	csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
 97	/* Wait for flush to complete */
 98	coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
 99	/* Wait for formatter to stop */
100	coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
101
102	CS_LOCK(csa->base);
103}
104
105static int tpiu_disable(struct coresight_device *csdev)
106{
107	struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
108
109	guard(spinlock)(&drvdata->spinlock);
110	csdev->refcnt--;
111	if (csdev->refcnt)
112		return -EBUSY;
113
114	tpiu_disable_hw(&csdev->access);
115
116	dev_dbg(&csdev->dev, "TPIU disabled\n");
117	return 0;
118}
119
120static const struct coresight_ops_sink tpiu_sink_ops = {
121	.enable		= tpiu_enable,
122	.disable	= tpiu_disable,
123};
124
125static const struct coresight_ops tpiu_cs_ops = {
126	.sink_ops	= &tpiu_sink_ops,
127};
128
129static int __tpiu_probe(struct device *dev, struct resource *res)
130{
131	void __iomem *base;
132	struct coresight_platform_data *pdata = NULL;
133	struct tpiu_drvdata *drvdata;
134	struct coresight_desc desc = { 0 };
135	int ret;
136
137	desc.name = coresight_alloc_device_name(&tpiu_devs, dev);
138	if (!desc.name)
139		return -ENOMEM;
140
141	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
142	if (!drvdata)
143		return -ENOMEM;
144
145	spin_lock_init(&drvdata->spinlock);
146
147	ret = coresight_get_enable_clocks(dev, &drvdata->pclk, &drvdata->atclk);
148	if (ret)
149		return ret;
150
151	dev_set_drvdata(dev, drvdata);
152
153	/* Validity for the resource is already checked by the AMBA core */
154	base = devm_ioremap_resource(dev, res);
155	if (IS_ERR(base))
156		return PTR_ERR(base);
157
158	drvdata->base = base;
159	desc.access = CSDEV_ACCESS_IOMEM(base);
160
161	/* Disable tpiu to support older devices */
162	tpiu_disable_hw(&desc.access);
163
164	pdata = coresight_get_platform_data(dev);
165	if (IS_ERR(pdata))
166		return PTR_ERR(pdata);
167	dev->platform_data = pdata;
168
169	desc.type = CORESIGHT_DEV_TYPE_SINK;
170	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
171	desc.ops = &tpiu_cs_ops;
172	desc.pdata = pdata;
173	desc.dev = dev;
174	drvdata->csdev = coresight_register(&desc);
175
176	if (!IS_ERR(drvdata->csdev))
177		return 0;
178
179	return PTR_ERR(drvdata->csdev);
180}
181
182static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
183{
184	int ret;
185
186	ret = __tpiu_probe(&adev->dev, &adev->res);
187	if (!ret)
188		pm_runtime_put(&adev->dev);
189	return ret;
190}
191
192static void __tpiu_remove(struct device *dev)
193{
194	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
195
196	coresight_unregister(drvdata->csdev);
197}
198
199static void tpiu_remove(struct amba_device *adev)
200{
201	__tpiu_remove(&adev->dev);
202}
203
204#ifdef CONFIG_PM
205static int tpiu_runtime_suspend(struct device *dev)
206{
207	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
208
209	clk_disable_unprepare(drvdata->atclk);
210	clk_disable_unprepare(drvdata->pclk);
211
212	return 0;
213}
214
215static int tpiu_runtime_resume(struct device *dev)
216{
217	struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
218	int ret;
219
220	ret = clk_prepare_enable(drvdata->pclk);
221	if (ret)
222		return ret;
223
224	ret = clk_prepare_enable(drvdata->atclk);
225	if (ret)
226		clk_disable_unprepare(drvdata->pclk);
227
228	return ret;
229}
230#endif
231
232static const struct dev_pm_ops tpiu_dev_pm_ops = {
233	SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
234};
235
236static const struct amba_id tpiu_ids[] = {
237	{
238		.id	= 0x000bb912,
239		.mask	= 0x000fffff,
240	},
241	{
242		.id	= 0x0004b912,
243		.mask	= 0x0007ffff,
244	},
245	{
246		/* Coresight SoC-600 */
247		.id	= 0x000bb9e7,
248		.mask	= 0x000fffff,
249	},
250	{ 0, 0, NULL },
251};
252
253MODULE_DEVICE_TABLE(amba, tpiu_ids);
254
255static struct amba_driver tpiu_driver = {
256	.drv = {
257		.name	= "coresight-tpiu",
258		.pm	= &tpiu_dev_pm_ops,
259		.suppress_bind_attrs = true,
260	},
261	.probe		= tpiu_probe,
262	.remove         = tpiu_remove,
263	.id_table	= tpiu_ids,
264};
265
266static int tpiu_platform_probe(struct platform_device *pdev)
267{
268	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
269	int ret;
270
271	pm_runtime_get_noresume(&pdev->dev);
272	pm_runtime_set_active(&pdev->dev);
273	pm_runtime_enable(&pdev->dev);
274
275	ret = __tpiu_probe(&pdev->dev, res);
276	pm_runtime_put(&pdev->dev);
277	if (ret)
278		pm_runtime_disable(&pdev->dev);
279
280	return ret;
281}
282
283static void tpiu_platform_remove(struct platform_device *pdev)
284{
285	struct tpiu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
286
287	if (WARN_ON(!drvdata))
288		return;
289
290	__tpiu_remove(&pdev->dev);
291	pm_runtime_disable(&pdev->dev);
292}
293
294#ifdef CONFIG_ACPI
295static const struct acpi_device_id tpiu_acpi_ids[] = {
296	{"ARMHC979", 0, 0, 0}, /* ARM CoreSight TPIU */
297	{}
298};
299MODULE_DEVICE_TABLE(acpi, tpiu_acpi_ids);
300#endif
301
302static struct platform_driver tpiu_platform_driver = {
303	.probe	= tpiu_platform_probe,
304	.remove = tpiu_platform_remove,
305	.driver = {
306		.name			= "coresight-tpiu-platform",
307		.acpi_match_table	= ACPI_PTR(tpiu_acpi_ids),
308		.suppress_bind_attrs	= true,
309		.pm			= &tpiu_dev_pm_ops,
310	},
311};
312
313static int __init tpiu_init(void)
314{
315	return coresight_init_driver("tpiu", &tpiu_driver, &tpiu_platform_driver, THIS_MODULE);
316}
317
318static void __exit tpiu_exit(void)
319{
320	coresight_remove_driver(&tpiu_driver, &tpiu_platform_driver);
321}
322module_init(tpiu_init);
323module_exit(tpiu_exit);
324
325MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
326MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
327MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");
328MODULE_LICENSE("GPL v2");