This source file includes following definitions.
- dynamic_funnel_enable_hw
- funnel_enable
- dynamic_funnel_disable_hw
- funnel_disable
- priority_show
- priority_store
- get_funnel_ctrl_hw
- funnel_ctrl_show
- funnel_probe
- funnel_runtime_suspend
- funnel_runtime_resume
- static_funnel_probe
- dynamic_funnel_probe
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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>
14 #include <linux/fs.h>
15 #include <linux/slab.h>
16 #include <linux/of.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>
22
23 #include "coresight-priv.h"
24
25 #define FUNNEL_FUNCTL 0x000
26 #define FUNNEL_PRICTL 0x004
27
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
32
33 DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
34
35
36
37
38
39
40
41
42
43 struct funnel_drvdata {
44 void __iomem *base;
45 struct clk *atclk;
46 struct coresight_device *csdev;
47 unsigned long priority;
48 spinlock_t spinlock;
49 };
50
51 static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
52 {
53 u32 functl;
54 int rc = 0;
55
56 CS_UNLOCK(drvdata->base);
57
58 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
59
60 if (!(functl & FUNNEL_ENSx_MASK)) {
61 rc = coresight_claim_device_unlocked(drvdata->base);
62 if (rc)
63 goto done;
64 }
65
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);
71 done:
72 CS_LOCK(drvdata->base);
73 return rc;
74 }
75
76 static int funnel_enable(struct coresight_device *csdev, int inport,
77 int outport)
78 {
79 int rc = 0;
80 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
81 unsigned long flags;
82 bool first_enable = false;
83
84 spin_lock_irqsave(&drvdata->spinlock, flags);
85 if (atomic_read(&csdev->refcnt[inport]) == 0) {
86 if (drvdata->base)
87 rc = dynamic_funnel_enable_hw(drvdata, inport);
88 if (!rc)
89 first_enable = true;
90 }
91 if (!rc)
92 atomic_inc(&csdev->refcnt[inport]);
93 spin_unlock_irqrestore(&drvdata->spinlock, flags);
94
95 if (first_enable)
96 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
97 return rc;
98 }
99
100 static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
101 int inport)
102 {
103 u32 functl;
104
105 CS_UNLOCK(drvdata->base);
106
107 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
108 functl &= ~(1 << inport);
109 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
110
111
112 if (!(functl & FUNNEL_ENSx_MASK))
113 coresight_disclaim_device_unlocked(drvdata->base);
114
115 CS_LOCK(drvdata->base);
116 }
117
118 static void funnel_disable(struct coresight_device *csdev, int inport,
119 int outport)
120 {
121 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
122 unsigned long flags;
123 bool last_disable = false;
124
125 spin_lock_irqsave(&drvdata->spinlock, flags);
126 if (atomic_dec_return(&csdev->refcnt[inport]) == 0) {
127 if (drvdata->base)
128 dynamic_funnel_disable_hw(drvdata, inport);
129 last_disable = true;
130 }
131 spin_unlock_irqrestore(&drvdata->spinlock, flags);
132
133 if (last_disable)
134 dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
135 }
136
137 static const struct coresight_ops_link funnel_link_ops = {
138 .enable = funnel_enable,
139 .disable = funnel_disable,
140 };
141
142 static const struct coresight_ops funnel_cs_ops = {
143 .link_ops = &funnel_link_ops,
144 };
145
146 static ssize_t priority_show(struct device *dev,
147 struct device_attribute *attr, char *buf)
148 {
149 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
150 unsigned long val = drvdata->priority;
151
152 return sprintf(buf, "%#lx\n", val);
153 }
154
155 static ssize_t priority_store(struct device *dev,
156 struct device_attribute *attr,
157 const char *buf, size_t size)
158 {
159 int ret;
160 unsigned long val;
161 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
162
163 ret = kstrtoul(buf, 16, &val);
164 if (ret)
165 return ret;
166
167 drvdata->priority = val;
168 return size;
169 }
170 static DEVICE_ATTR_RW(priority);
171
172 static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
173 {
174 u32 functl;
175
176 CS_UNLOCK(drvdata->base);
177 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
178 CS_LOCK(drvdata->base);
179
180 return functl;
181 }
182
183 static ssize_t funnel_ctrl_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
185 {
186 u32 val;
187 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
188
189 pm_runtime_get_sync(dev->parent);
190
191 val = get_funnel_ctrl_hw(drvdata);
192
193 pm_runtime_put(dev->parent);
194
195 return sprintf(buf, "%#x\n", val);
196 }
197 static DEVICE_ATTR_RO(funnel_ctrl);
198
199 static struct attribute *coresight_funnel_attrs[] = {
200 &dev_attr_funnel_ctrl.attr,
201 &dev_attr_priority.attr,
202 NULL,
203 };
204 ATTRIBUTE_GROUPS(coresight_funnel);
205
206 static int funnel_probe(struct device *dev, struct resource *res)
207 {
208 int ret;
209 void __iomem *base;
210 struct coresight_platform_data *pdata = NULL;
211 struct funnel_drvdata *drvdata;
212 struct coresight_desc desc = { 0 };
213
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");
217
218 desc.name = coresight_alloc_device_name(&funnel_devs, dev);
219 if (!desc.name)
220 return -ENOMEM;
221
222 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
223 if (!drvdata)
224 return -ENOMEM;
225
226 drvdata->atclk = devm_clk_get(dev, "atclk");
227 if (!IS_ERR(drvdata->atclk)) {
228 ret = clk_prepare_enable(drvdata->atclk);
229 if (ret)
230 return ret;
231 }
232
233
234
235
236
237 if (res) {
238 base = devm_ioremap_resource(dev, res);
239 if (IS_ERR(base)) {
240 ret = PTR_ERR(base);
241 goto out_disable_clk;
242 }
243 drvdata->base = base;
244 desc.groups = coresight_funnel_groups;
245 }
246
247 dev_set_drvdata(dev, drvdata);
248
249 pdata = coresight_get_platform_data(dev);
250 if (IS_ERR(pdata)) {
251 ret = PTR_ERR(pdata);
252 goto out_disable_clk;
253 }
254 dev->platform_data = pdata;
255
256 desc.type = CORESIGHT_DEV_TYPE_LINK;
257 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
258 desc.ops = &funnel_cs_ops;
259 desc.pdata = pdata;
260 desc.dev = dev;
261 drvdata->csdev = coresight_register(&desc);
262 if (IS_ERR(drvdata->csdev)) {
263 ret = PTR_ERR(drvdata->csdev);
264 goto out_disable_clk;
265 }
266
267 pm_runtime_put(dev);
268 ret = 0;
269
270 out_disable_clk:
271 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
272 clk_disable_unprepare(drvdata->atclk);
273 return ret;
274 }
275
276 #ifdef CONFIG_PM
277 static int funnel_runtime_suspend(struct device *dev)
278 {
279 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
280
281 if (drvdata && !IS_ERR(drvdata->atclk))
282 clk_disable_unprepare(drvdata->atclk);
283
284 return 0;
285 }
286
287 static int funnel_runtime_resume(struct device *dev)
288 {
289 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
290
291 if (drvdata && !IS_ERR(drvdata->atclk))
292 clk_prepare_enable(drvdata->atclk);
293
294 return 0;
295 }
296 #endif
297
298 static const struct dev_pm_ops funnel_dev_pm_ops = {
299 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
300 };
301
302 static int static_funnel_probe(struct platform_device *pdev)
303 {
304 int ret;
305
306 pm_runtime_get_noresume(&pdev->dev);
307 pm_runtime_set_active(&pdev->dev);
308 pm_runtime_enable(&pdev->dev);
309
310
311 ret = funnel_probe(&pdev->dev, NULL);
312
313 if (ret) {
314 pm_runtime_put_noidle(&pdev->dev);
315 pm_runtime_disable(&pdev->dev);
316 }
317
318 return ret;
319 }
320
321 static const struct of_device_id static_funnel_match[] = {
322 {.compatible = "arm,coresight-static-funnel"},
323 {}
324 };
325
326 #ifdef CONFIG_ACPI
327 static const struct acpi_device_id static_funnel_ids[] = {
328 {"ARMHC9FE", 0},
329 {},
330 };
331 #endif
332
333 static struct platform_driver static_funnel_driver = {
334 .probe = static_funnel_probe,
335 .driver = {
336 .name = "coresight-static-funnel",
337 .of_match_table = static_funnel_match,
338 .acpi_match_table = ACPI_PTR(static_funnel_ids),
339 .pm = &funnel_dev_pm_ops,
340 .suppress_bind_attrs = true,
341 },
342 };
343 builtin_platform_driver(static_funnel_driver);
344
345 static int dynamic_funnel_probe(struct amba_device *adev,
346 const struct amba_id *id)
347 {
348 return funnel_probe(&adev->dev, &adev->res);
349 }
350
351 static const struct amba_id dynamic_funnel_ids[] = {
352 {
353 .id = 0x000bb908,
354 .mask = 0x000fffff,
355 },
356 {
357
358 .id = 0x000bb9eb,
359 .mask = 0x000fffff,
360 },
361 { 0, 0},
362 };
363
364 static struct amba_driver dynamic_funnel_driver = {
365 .drv = {
366 .name = "coresight-dynamic-funnel",
367 .owner = THIS_MODULE,
368 .pm = &funnel_dev_pm_ops,
369 .suppress_bind_attrs = true,
370 },
371 .probe = dynamic_funnel_probe,
372 .id_table = dynamic_funnel_ids,
373 };
374 builtin_amba_driver(dynamic_funnel_driver);