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8#include <linux/acpi.h>
9#include <linux/amba/bus.h>
10#include <linux/kernel.h>
11#include <linux/device.h>
12#include <linux/platform_device.h>
13#include <linux/io.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/pm_runtime.h>
17#include <linux/property.h>
18#include <linux/clk.h>
19#include <linux/of.h>
20#include <linux/coresight.h>
21
22#include "coresight-priv.h"
23
24#define REPLICATOR_IDFILTER0 0x000
25#define REPLICATOR_IDFILTER1 0x004
26
27DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
28
29
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32
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35
36
37
38struct replicator_drvdata {
39 void __iomem *base;
40 struct clk *atclk;
41 struct coresight_device *csdev;
42 spinlock_t spinlock;
43 bool check_idfilter_val;
44};
45
46static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
47{
48 CS_UNLOCK(drvdata->base);
49
50 if (!coresight_claim_device_unlocked(drvdata->base)) {
51 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
52 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
53 coresight_disclaim_device_unlocked(drvdata->base);
54 }
55
56 CS_LOCK(drvdata->base);
57}
58
59
60
61
62static inline void replicator_reset(struct replicator_drvdata *drvdata)
63{
64 if (drvdata->base)
65 dynamic_replicator_reset(drvdata);
66}
67
68static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
69 int inport, int outport)
70{
71 int rc = 0;
72 u32 id0val, id1val;
73
74 CS_UNLOCK(drvdata->base);
75
76 id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
77 id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
78
79
80
81
82
83 if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0)
84 id0val = id1val = 0xff;
85
86 if (id0val == 0xff && id1val == 0xff)
87 rc = coresight_claim_device_unlocked(drvdata->base);
88
89 if (!rc) {
90 switch (outport) {
91 case 0:
92 id0val = 0x0;
93 break;
94 case 1:
95 id1val = 0x0;
96 break;
97 default:
98 WARN_ON(1);
99 rc = -EINVAL;
100 }
101 }
102
103
104 if (!rc) {
105 writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0);
106 writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
107 }
108
109 CS_LOCK(drvdata->base);
110
111 return rc;
112}
113
114static int replicator_enable(struct coresight_device *csdev, int inport,
115 int outport)
116{
117 int rc = 0;
118 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
119 unsigned long flags;
120 bool first_enable = false;
121
122 spin_lock_irqsave(&drvdata->spinlock, flags);
123 if (atomic_read(&csdev->refcnt[outport]) == 0) {
124 if (drvdata->base)
125 rc = dynamic_replicator_enable(drvdata, inport,
126 outport);
127 if (!rc)
128 first_enable = true;
129 }
130 if (!rc)
131 atomic_inc(&csdev->refcnt[outport]);
132 spin_unlock_irqrestore(&drvdata->spinlock, flags);
133
134 if (first_enable)
135 dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
136 return rc;
137}
138
139static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
140 int inport, int outport)
141{
142 u32 reg;
143
144 switch (outport) {
145 case 0:
146 reg = REPLICATOR_IDFILTER0;
147 break;
148 case 1:
149 reg = REPLICATOR_IDFILTER1;
150 break;
151 default:
152 WARN_ON(1);
153 return;
154 }
155
156 CS_UNLOCK(drvdata->base);
157
158
159 writel_relaxed(0xff, drvdata->base + reg);
160
161 if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
162 (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
163 coresight_disclaim_device_unlocked(drvdata->base);
164 CS_LOCK(drvdata->base);
165}
166
167static void replicator_disable(struct coresight_device *csdev, int inport,
168 int outport)
169{
170 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
171 unsigned long flags;
172 bool last_disable = false;
173
174 spin_lock_irqsave(&drvdata->spinlock, flags);
175 if (atomic_dec_return(&csdev->refcnt[outport]) == 0) {
176 if (drvdata->base)
177 dynamic_replicator_disable(drvdata, inport, outport);
178 last_disable = true;
179 }
180 spin_unlock_irqrestore(&drvdata->spinlock, flags);
181
182 if (last_disable)
183 dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
184}
185
186static const struct coresight_ops_link replicator_link_ops = {
187 .enable = replicator_enable,
188 .disable = replicator_disable,
189};
190
191static const struct coresight_ops replicator_cs_ops = {
192 .link_ops = &replicator_link_ops,
193};
194
195#define coresight_replicator_reg(name, offset) \
196 coresight_simple_reg32(struct replicator_drvdata, name, offset)
197
198coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
199coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
200
201static struct attribute *replicator_mgmt_attrs[] = {
202 &dev_attr_idfilter0.attr,
203 &dev_attr_idfilter1.attr,
204 NULL,
205};
206
207static const struct attribute_group replicator_mgmt_group = {
208 .attrs = replicator_mgmt_attrs,
209 .name = "mgmt",
210};
211
212static const struct attribute_group *replicator_groups[] = {
213 &replicator_mgmt_group,
214 NULL,
215};
216
217static int replicator_probe(struct device *dev, struct resource *res)
218{
219 int ret = 0;
220 struct coresight_platform_data *pdata = NULL;
221 struct replicator_drvdata *drvdata;
222 struct coresight_desc desc = { 0 };
223 void __iomem *base;
224
225 if (is_of_node(dev_fwnode(dev)) &&
226 of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
227 dev_warn_once(dev,
228 "Uses OBSOLETE CoreSight replicator binding\n");
229
230 desc.name = coresight_alloc_device_name(&replicator_devs, dev);
231 if (!desc.name)
232 return -ENOMEM;
233
234 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
235 if (!drvdata)
236 return -ENOMEM;
237
238 drvdata->atclk = devm_clk_get(dev, "atclk");
239 if (!IS_ERR(drvdata->atclk)) {
240 ret = clk_prepare_enable(drvdata->atclk);
241 if (ret)
242 return ret;
243 }
244
245
246
247
248
249 if (res) {
250 base = devm_ioremap_resource(dev, res);
251 if (IS_ERR(base)) {
252 ret = PTR_ERR(base);
253 goto out_disable_clk;
254 }
255 drvdata->base = base;
256 desc.groups = replicator_groups;
257 }
258
259 if (fwnode_property_present(dev_fwnode(dev),
260 "qcom,replicator-loses-context"))
261 drvdata->check_idfilter_val = true;
262
263 dev_set_drvdata(dev, drvdata);
264
265 pdata = coresight_get_platform_data(dev);
266 if (IS_ERR(pdata)) {
267 ret = PTR_ERR(pdata);
268 goto out_disable_clk;
269 }
270 dev->platform_data = pdata;
271
272 spin_lock_init(&drvdata->spinlock);
273 desc.type = CORESIGHT_DEV_TYPE_LINK;
274 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
275 desc.ops = &replicator_cs_ops;
276 desc.pdata = dev->platform_data;
277 desc.dev = dev;
278
279 drvdata->csdev = coresight_register(&desc);
280 if (IS_ERR(drvdata->csdev)) {
281 ret = PTR_ERR(drvdata->csdev);
282 goto out_disable_clk;
283 }
284
285 replicator_reset(drvdata);
286 pm_runtime_put(dev);
287
288out_disable_clk:
289 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
290 clk_disable_unprepare(drvdata->atclk);
291 return ret;
292}
293
294static int static_replicator_probe(struct platform_device *pdev)
295{
296 int ret;
297
298 pm_runtime_get_noresume(&pdev->dev);
299 pm_runtime_set_active(&pdev->dev);
300 pm_runtime_enable(&pdev->dev);
301
302
303 ret = replicator_probe(&pdev->dev, NULL);
304
305 if (ret) {
306 pm_runtime_put_noidle(&pdev->dev);
307 pm_runtime_disable(&pdev->dev);
308 }
309
310 return ret;
311}
312
313#ifdef CONFIG_PM
314static int replicator_runtime_suspend(struct device *dev)
315{
316 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
317
318 if (drvdata && !IS_ERR(drvdata->atclk))
319 clk_disable_unprepare(drvdata->atclk);
320
321 return 0;
322}
323
324static int replicator_runtime_resume(struct device *dev)
325{
326 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
327
328 if (drvdata && !IS_ERR(drvdata->atclk))
329 clk_prepare_enable(drvdata->atclk);
330
331 return 0;
332}
333#endif
334
335static const struct dev_pm_ops replicator_dev_pm_ops = {
336 SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
337 replicator_runtime_resume, NULL)
338};
339
340static const struct of_device_id static_replicator_match[] = {
341 {.compatible = "arm,coresight-replicator"},
342 {.compatible = "arm,coresight-static-replicator"},
343 {}
344};
345
346#ifdef CONFIG_ACPI
347static const struct acpi_device_id static_replicator_acpi_ids[] = {
348 {"ARMHC985", 0},
349 {}
350};
351#endif
352
353static struct platform_driver static_replicator_driver = {
354 .probe = static_replicator_probe,
355 .driver = {
356 .name = "coresight-static-replicator",
357 .of_match_table = of_match_ptr(static_replicator_match),
358 .acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
359 .pm = &replicator_dev_pm_ops,
360 .suppress_bind_attrs = true,
361 },
362};
363builtin_platform_driver(static_replicator_driver);
364
365static int dynamic_replicator_probe(struct amba_device *adev,
366 const struct amba_id *id)
367{
368 return replicator_probe(&adev->dev, &adev->res);
369}
370
371static const struct amba_id dynamic_replicator_ids[] = {
372 CS_AMBA_ID(0x000bb909),
373 CS_AMBA_ID(0x000bb9ec),
374 {},
375};
376
377static struct amba_driver dynamic_replicator_driver = {
378 .drv = {
379 .name = "coresight-dynamic-replicator",
380 .pm = &replicator_dev_pm_ops,
381 .suppress_bind_attrs = true,
382 },
383 .probe = dynamic_replicator_probe,
384 .id_table = dynamic_replicator_ids,
385};
386builtin_amba_driver(dynamic_replicator_driver);
387
