1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
5 * Description: CoreSight Funnel driver
8 #include <linux/acpi.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/device.h>
13 #include <linux/err.h>
15 #include <linux/slab.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/coresight.h>
20 #include <linux/amba/bus.h>
21 #include <linux/clk.h>
23 #include "coresight-priv.h"
25 #define FUNNEL_FUNCTL 0x000
26 #define FUNNEL_PRICTL 0x004
28 #define FUNNEL_HOLDTIME_MASK 0xf00
29 #define FUNNEL_HOLDTIME_SHFT 0x8
30 #define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
31 #define FUNNEL_ENSx_MASK 0xff
33 DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
36 * struct funnel_drvdata - specifics associated to a funnel component
37 * @base: memory mapped base address for this component.
38 * @atclk: optional clock for the core parts of the funnel.
39 * @csdev: component vitals needed by the framework.
40 * @priority: port selection order.
41 * @spinlock: serialize enable/disable operations.
43 struct funnel_drvdata {
46 struct coresight_device *csdev;
47 unsigned long priority;
51 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
56 CS_UNLOCK(drvdata->base);
58 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
59 /* Claim the device only when we enable the first slave */
60 if (!(functl & FUNNEL_ENSx_MASK)) {
61 rc = coresight_claim_device_unlocked(drvdata->base);
66 functl &= ~FUNNEL_HOLDTIME_MASK;
67 functl |= FUNNEL_HOLDTIME;
68 functl |= (1 << port);
69 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
70 writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
72 CS_LOCK(drvdata->base);
76 static int funnel_enable(struct coresight_device *csdev, int inport,
80 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
82 bool first_enable = false;
84 spin_lock_irqsave(&drvdata->spinlock, flags);
85 if (atomic_read(&csdev->refcnt[inport]) == 0) {
87 rc = dynamic_funnel_enable_hw(drvdata, inport);
92 atomic_inc(&csdev->refcnt[inport]);
93 spin_unlock_irqrestore(&drvdata->spinlock, flags);
96 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
100 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
105 CS_UNLOCK(drvdata->base);
107 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
108 functl &= ~(1 << inport);
109 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
111 /* Disclaim the device if none of the slaves are now active */
112 if (!(functl & FUNNEL_ENSx_MASK))
113 coresight_disclaim_device_unlocked(drvdata->base);
115 CS_LOCK(drvdata->base);
118 static void funnel_disable(struct coresight_device *csdev, int inport,
121 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
123 bool last_disable = false;
125 spin_lock_irqsave(&drvdata->spinlock, flags);
126 if (atomic_dec_return(&csdev->refcnt[inport]) == 0) {
128 dynamic_funnel_disable_hw(drvdata, inport);
131 spin_unlock_irqrestore(&drvdata->spinlock, flags);
134 dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
137 static const struct coresight_ops_link funnel_link_ops = {
138 .enable = funnel_enable,
139 .disable = funnel_disable,
142 static const struct coresight_ops funnel_cs_ops = {
143 .link_ops = &funnel_link_ops,
146 static ssize_t priority_show(struct device *dev,
147 struct device_attribute *attr, char *buf)
149 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
150 unsigned long val = drvdata->priority;
152 return sprintf(buf, "%#lx\n", val);
155 static ssize_t priority_store(struct device *dev,
156 struct device_attribute *attr,
157 const char *buf, size_t size)
161 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
163 ret = kstrtoul(buf, 16, &val);
167 drvdata->priority = val;
170 static DEVICE_ATTR_RW(priority);
172 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
176 CS_UNLOCK(drvdata->base);
177 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
178 CS_LOCK(drvdata->base);
183 static ssize_t funnel_ctrl_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
187 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
189 pm_runtime_get_sync(dev->parent);
191 val = get_funnel_ctrl_hw(drvdata);
193 pm_runtime_put(dev->parent);
195 return sprintf(buf, "%#x\n", val);
197 static DEVICE_ATTR_RO(funnel_ctrl);
199 static struct attribute *coresight_funnel_attrs[] = {
200 &dev_attr_funnel_ctrl.attr,
201 &dev_attr_priority.attr,
204 ATTRIBUTE_GROUPS(coresight_funnel);
206 static int funnel_probe(struct device *dev, struct resource *res)
210 struct coresight_platform_data *pdata = NULL;
211 struct funnel_drvdata *drvdata;
212 struct coresight_desc desc = { 0 };
214 if (is_of_node(dev_fwnode(dev)) &&
215 of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
216 dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
218 desc.name = coresight_alloc_device_name(&funnel_devs, dev);
222 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
226 drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
227 if (!IS_ERR(drvdata->atclk)) {
228 ret = clk_prepare_enable(drvdata->atclk);
234 * Map the device base for dynamic-funnel, which has been
235 * validated by AMBA core.
238 base = devm_ioremap_resource(dev, res);
241 goto out_disable_clk;
243 drvdata->base = base;
244 desc.groups = coresight_funnel_groups;
247 dev_set_drvdata(dev, drvdata);
249 pdata = coresight_get_platform_data(dev);
251 ret = PTR_ERR(pdata);
252 goto out_disable_clk;
254 dev->platform_data = pdata;
256 spin_lock_init(&drvdata->spinlock);
257 desc.type = CORESIGHT_DEV_TYPE_LINK;
258 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
259 desc.ops = &funnel_cs_ops;
262 drvdata->csdev = coresight_register(&desc);
263 if (IS_ERR(drvdata->csdev)) {
264 ret = PTR_ERR(drvdata->csdev);
265 goto out_disable_clk;
272 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
273 clk_disable_unprepare(drvdata->atclk);
277 static int funnel_remove(struct device *dev)
279 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
281 coresight_unregister(drvdata->csdev);
287 static int funnel_runtime_suspend(struct device *dev)
289 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
291 if (drvdata && !IS_ERR(drvdata->atclk))
292 clk_disable_unprepare(drvdata->atclk);
297 static int funnel_runtime_resume(struct device *dev)
299 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
301 if (drvdata && !IS_ERR(drvdata->atclk))
302 clk_prepare_enable(drvdata->atclk);
308 static const struct dev_pm_ops funnel_dev_pm_ops = {
309 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
312 static int static_funnel_probe(struct platform_device *pdev)
316 pm_runtime_get_noresume(&pdev->dev);
317 pm_runtime_set_active(&pdev->dev);
318 pm_runtime_enable(&pdev->dev);
320 /* Static funnel do not have programming base */
321 ret = funnel_probe(&pdev->dev, NULL);
324 pm_runtime_put_noidle(&pdev->dev);
325 pm_runtime_disable(&pdev->dev);
331 static int static_funnel_remove(struct platform_device *pdev)
333 funnel_remove(&pdev->dev);
334 pm_runtime_disable(&pdev->dev);
338 static const struct of_device_id static_funnel_match[] = {
339 {.compatible = "arm,coresight-static-funnel"},
343 MODULE_DEVICE_TABLE(of, static_funnel_match);
346 static const struct acpi_device_id static_funnel_ids[] = {
351 MODULE_DEVICE_TABLE(acpi, static_funnel_ids);
354 static struct platform_driver static_funnel_driver = {
355 .probe = static_funnel_probe,
356 .remove = static_funnel_remove,
358 .name = "coresight-static-funnel",
359 .owner = THIS_MODULE,
360 .of_match_table = static_funnel_match,
361 .acpi_match_table = ACPI_PTR(static_funnel_ids),
362 .pm = &funnel_dev_pm_ops,
363 .suppress_bind_attrs = true,
367 static int dynamic_funnel_probe(struct amba_device *adev,
368 const struct amba_id *id)
370 return funnel_probe(&adev->dev, &adev->res);
373 static void dynamic_funnel_remove(struct amba_device *adev)
375 funnel_remove(&adev->dev);
378 static const struct amba_id dynamic_funnel_ids[] = {
384 /* Coresight SoC-600 */
391 MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
393 static struct amba_driver dynamic_funnel_driver = {
395 .name = "coresight-dynamic-funnel",
396 .owner = THIS_MODULE,
397 .pm = &funnel_dev_pm_ops,
398 .suppress_bind_attrs = true,
400 .probe = dynamic_funnel_probe,
401 .remove = dynamic_funnel_remove,
402 .id_table = dynamic_funnel_ids,
405 static int __init funnel_init(void)
409 ret = platform_driver_register(&static_funnel_driver);
411 pr_info("Error registering platform driver\n");
415 ret = amba_driver_register(&dynamic_funnel_driver);
417 pr_info("Error registering amba driver\n");
418 platform_driver_unregister(&static_funnel_driver);
424 static void __exit funnel_exit(void)
426 platform_driver_unregister(&static_funnel_driver);
427 amba_driver_unregister(&dynamic_funnel_driver);
430 module_init(funnel_init);
431 module_exit(funnel_exit);
433 MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
434 MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
435 MODULE_DESCRIPTION("Arm CoreSight Funnel Driver");
436 MODULE_LICENSE("GPL v2");