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8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/types.h>
11#include <linux/device.h>
12#include <linux/err.h>
13#include <linux/fs.h>
14#include <linux/slab.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18#include <linux/coresight.h>
19#include <linux/amba/bus.h>
20#include <linux/clk.h>
21
22#include "coresight-priv.h"
23
24#define FUNNEL_FUNCTL 0x000
25#define FUNNEL_PRICTL 0x004
26
27#define FUNNEL_HOLDTIME_MASK 0xf00
28#define FUNNEL_HOLDTIME_SHFT 0x8
29#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
30#define FUNNEL_ENSx_MASK 0xff
31
32DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
33
34
35
36
37
38
39
40
41struct funnel_drvdata {
42 void __iomem *base;
43 struct clk *atclk;
44 struct coresight_device *csdev;
45 unsigned long priority;
46};
47
48static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
49{
50 u32 functl;
51 int rc = 0;
52
53 CS_UNLOCK(drvdata->base);
54
55 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
56
57 if (!(functl & FUNNEL_ENSx_MASK)) {
58 rc = coresight_claim_device_unlocked(drvdata->base);
59 if (rc)
60 goto done;
61 }
62
63 functl &= ~FUNNEL_HOLDTIME_MASK;
64 functl |= FUNNEL_HOLDTIME;
65 functl |= (1 << port);
66 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
67 writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
68done:
69 CS_LOCK(drvdata->base);
70 return rc;
71}
72
73static int funnel_enable(struct coresight_device *csdev, int inport,
74 int outport)
75{
76 int rc = 0;
77 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
78
79 if (drvdata->base)
80 rc = dynamic_funnel_enable_hw(drvdata, inport);
81
82 if (!rc)
83 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
84 return rc;
85}
86
87static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
88 int inport)
89{
90 u32 functl;
91
92 CS_UNLOCK(drvdata->base);
93
94 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
95 functl &= ~(1 << inport);
96 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
97
98
99 if (!(functl & FUNNEL_ENSx_MASK))
100 coresight_disclaim_device_unlocked(drvdata->base);
101
102 CS_LOCK(drvdata->base);
103}
104
105static void funnel_disable(struct coresight_device *csdev, int inport,
106 int outport)
107{
108 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
109
110 if (drvdata->base)
111 dynamic_funnel_disable_hw(drvdata, inport);
112
113 dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
114}
115
116static const struct coresight_ops_link funnel_link_ops = {
117 .enable = funnel_enable,
118 .disable = funnel_disable,
119};
120
121static const struct coresight_ops funnel_cs_ops = {
122 .link_ops = &funnel_link_ops,
123};
124
125static ssize_t priority_show(struct device *dev,
126 struct device_attribute *attr, char *buf)
127{
128 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
129 unsigned long val = drvdata->priority;
130
131 return sprintf(buf, "%#lx\n", val);
132}
133
134static ssize_t priority_store(struct device *dev,
135 struct device_attribute *attr,
136 const char *buf, size_t size)
137{
138 int ret;
139 unsigned long val;
140 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
141
142 ret = kstrtoul(buf, 16, &val);
143 if (ret)
144 return ret;
145
146 drvdata->priority = val;
147 return size;
148}
149static DEVICE_ATTR_RW(priority);
150
151static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
152{
153 u32 functl;
154
155 CS_UNLOCK(drvdata->base);
156 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
157 CS_LOCK(drvdata->base);
158
159 return functl;
160}
161
162static ssize_t funnel_ctrl_show(struct device *dev,
163 struct device_attribute *attr, char *buf)
164{
165 u32 val;
166 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
167
168 pm_runtime_get_sync(dev->parent);
169
170 val = get_funnel_ctrl_hw(drvdata);
171
172 pm_runtime_put(dev->parent);
173
174 return sprintf(buf, "%#x\n", val);
175}
176static DEVICE_ATTR_RO(funnel_ctrl);
177
178static struct attribute *coresight_funnel_attrs[] = {
179 &dev_attr_funnel_ctrl.attr,
180 &dev_attr_priority.attr,
181 NULL,
182};
183ATTRIBUTE_GROUPS(coresight_funnel);
184
185static int funnel_probe(struct device *dev, struct resource *res)
186{
187 int ret;
188 void __iomem *base;
189 struct coresight_platform_data *pdata = NULL;
190 struct funnel_drvdata *drvdata;
191 struct coresight_desc desc = { 0 };
192
193 if (is_of_node(dev_fwnode(dev)) &&
194 of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
195 pr_warn_once("Uses OBSOLETE CoreSight funnel binding\n");
196
197 desc.name = coresight_alloc_device_name(&funnel_devs, dev);
198 if (!desc.name)
199 return -ENOMEM;
200
201 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
202 if (!drvdata)
203 return -ENOMEM;
204
205 drvdata->atclk = devm_clk_get(dev, "atclk");
206 if (!IS_ERR(drvdata->atclk)) {
207 ret = clk_prepare_enable(drvdata->atclk);
208 if (ret)
209 return ret;
210 }
211
212
213
214
215
216 if (res) {
217 base = devm_ioremap_resource(dev, res);
218 if (IS_ERR(base)) {
219 ret = PTR_ERR(base);
220 goto out_disable_clk;
221 }
222 drvdata->base = base;
223 desc.groups = coresight_funnel_groups;
224 }
225
226 dev_set_drvdata(dev, drvdata);
227
228 pdata = coresight_get_platform_data(dev);
229 if (IS_ERR(pdata)) {
230 ret = PTR_ERR(pdata);
231 goto out_disable_clk;
232 }
233 dev->platform_data = pdata;
234
235 desc.type = CORESIGHT_DEV_TYPE_LINK;
236 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
237 desc.ops = &funnel_cs_ops;
238 desc.pdata = pdata;
239 desc.dev = dev;
240 drvdata->csdev = coresight_register(&desc);
241 if (IS_ERR(drvdata->csdev)) {
242 ret = PTR_ERR(drvdata->csdev);
243 goto out_disable_clk;
244 }
245
246 pm_runtime_put(dev);
247 ret = 0;
248
249out_disable_clk:
250 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
251 clk_disable_unprepare(drvdata->atclk);
252 return ret;
253}
254
255#ifdef CONFIG_PM
256static int funnel_runtime_suspend(struct device *dev)
257{
258 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
259
260 if (drvdata && !IS_ERR(drvdata->atclk))
261 clk_disable_unprepare(drvdata->atclk);
262
263 return 0;
264}
265
266static int funnel_runtime_resume(struct device *dev)
267{
268 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
269
270 if (drvdata && !IS_ERR(drvdata->atclk))
271 clk_prepare_enable(drvdata->atclk);
272
273 return 0;
274}
275#endif
276
277static const struct dev_pm_ops funnel_dev_pm_ops = {
278 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
279};
280
281static int static_funnel_probe(struct platform_device *pdev)
282{
283 int ret;
284
285 pm_runtime_get_noresume(&pdev->dev);
286 pm_runtime_set_active(&pdev->dev);
287 pm_runtime_enable(&pdev->dev);
288
289
290 ret = funnel_probe(&pdev->dev, NULL);
291
292 if (ret) {
293 pm_runtime_put_noidle(&pdev->dev);
294 pm_runtime_disable(&pdev->dev);
295 }
296
297 return ret;
298}
299
300static const struct of_device_id static_funnel_match[] = {
301 {.compatible = "arm,coresight-static-funnel"},
302 {}
303};
304
305static struct platform_driver static_funnel_driver = {
306 .probe = static_funnel_probe,
307 .driver = {
308 .name = "coresight-static-funnel",
309 .of_match_table = static_funnel_match,
310 .pm = &funnel_dev_pm_ops,
311 .suppress_bind_attrs = true,
312 },
313};
314builtin_platform_driver(static_funnel_driver);
315
316static int dynamic_funnel_probe(struct amba_device *adev,
317 const struct amba_id *id)
318{
319 return funnel_probe(&adev->dev, &adev->res);
320}
321
322static const struct amba_id dynamic_funnel_ids[] = {
323 {
324 .id = 0x000bb908,
325 .mask = 0x000fffff,
326 },
327 {
328
329 .id = 0x000bb9eb,
330 .mask = 0x000fffff,
331 },
332 { 0, 0},
333};
334
335static struct amba_driver dynamic_funnel_driver = {
336 .drv = {
337 .name = "coresight-dynamic-funnel",
338 .owner = THIS_MODULE,
339 .pm = &funnel_dev_pm_ops,
340 .suppress_bind_attrs = true,
341 },
342 .probe = dynamic_funnel_probe,
343 .id_table = dynamic_funnel_ids,
344};
345builtin_amba_driver(dynamic_funnel_driver);
346