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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/clk.h>
18#include <linux/of.h>
19#include <linux/coresight.h>
20
21#include "coresight-priv.h"
22
23#define REPLICATOR_IDFILTER0 0x000
24#define REPLICATOR_IDFILTER1 0x004
25
26DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
27
28
29
30
31
32
33
34
35struct replicator_drvdata {
36 void __iomem *base;
37 struct clk *atclk;
38 struct coresight_device *csdev;
39};
40
41static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
42{
43 CS_UNLOCK(drvdata->base);
44
45 if (!coresight_claim_device_unlocked(drvdata->base)) {
46 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
47 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
48 coresight_disclaim_device_unlocked(drvdata->base);
49 }
50
51 CS_LOCK(drvdata->base);
52}
53
54
55
56
57static inline void replicator_reset(struct replicator_drvdata *drvdata)
58{
59 if (drvdata->base)
60 dynamic_replicator_reset(drvdata);
61}
62
63static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
64 int inport, int outport)
65{
66 int rc = 0;
67 u32 reg;
68
69 switch (outport) {
70 case 0:
71 reg = REPLICATOR_IDFILTER0;
72 break;
73 case 1:
74 reg = REPLICATOR_IDFILTER1;
75 break;
76 default:
77 WARN_ON(1);
78 return -EINVAL;
79 }
80
81 CS_UNLOCK(drvdata->base);
82
83 if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
84 (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
85 rc = coresight_claim_device_unlocked(drvdata->base);
86
87
88 if (!rc)
89 writel_relaxed(0x00, drvdata->base + reg);
90 CS_LOCK(drvdata->base);
91
92 return rc;
93}
94
95static int replicator_enable(struct coresight_device *csdev, int inport,
96 int outport)
97{
98 int rc = 0;
99 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
100
101 if (drvdata->base)
102 rc = dynamic_replicator_enable(drvdata, inport, outport);
103 if (!rc)
104 dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
105 return rc;
106}
107
108static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
109 int inport, int outport)
110{
111 u32 reg;
112
113 switch (outport) {
114 case 0:
115 reg = REPLICATOR_IDFILTER0;
116 break;
117 case 1:
118 reg = REPLICATOR_IDFILTER1;
119 break;
120 default:
121 WARN_ON(1);
122 return;
123 }
124
125 CS_UNLOCK(drvdata->base);
126
127
128 writel_relaxed(0xff, drvdata->base + reg);
129
130 if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
131 (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
132 coresight_disclaim_device_unlocked(drvdata->base);
133 CS_LOCK(drvdata->base);
134}
135
136static void replicator_disable(struct coresight_device *csdev, int inport,
137 int outport)
138{
139 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
140
141 if (drvdata->base)
142 dynamic_replicator_disable(drvdata, inport, outport);
143 dev_dbg(&csdev->dev, "REPLICATOR disabled\n");
144}
145
146static const struct coresight_ops_link replicator_link_ops = {
147 .enable = replicator_enable,
148 .disable = replicator_disable,
149};
150
151static const struct coresight_ops replicator_cs_ops = {
152 .link_ops = &replicator_link_ops,
153};
154
155#define coresight_replicator_reg(name, offset) \
156 coresight_simple_reg32(struct replicator_drvdata, name, offset)
157
158coresight_replicator_reg(idfilter0, REPLICATOR_IDFILTER0);
159coresight_replicator_reg(idfilter1, REPLICATOR_IDFILTER1);
160
161static struct attribute *replicator_mgmt_attrs[] = {
162 &dev_attr_idfilter0.attr,
163 &dev_attr_idfilter1.attr,
164 NULL,
165};
166
167static const struct attribute_group replicator_mgmt_group = {
168 .attrs = replicator_mgmt_attrs,
169 .name = "mgmt",
170};
171
172static const struct attribute_group *replicator_groups[] = {
173 &replicator_mgmt_group,
174 NULL,
175};
176
177static int replicator_probe(struct device *dev, struct resource *res)
178{
179 int ret = 0;
180 struct coresight_platform_data *pdata = NULL;
181 struct replicator_drvdata *drvdata;
182 struct coresight_desc desc = { 0 };
183 void __iomem *base;
184
185 if (is_of_node(dev_fwnode(dev)) &&
186 of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
187 pr_warn_once("Uses OBSOLETE CoreSight replicator binding\n");
188
189 desc.name = coresight_alloc_device_name(&replicator_devs, dev);
190 if (!desc.name)
191 return -ENOMEM;
192
193 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
194 if (!drvdata)
195 return -ENOMEM;
196
197 drvdata->atclk = devm_clk_get(dev, "atclk");
198 if (!IS_ERR(drvdata->atclk)) {
199 ret = clk_prepare_enable(drvdata->atclk);
200 if (ret)
201 return ret;
202 }
203
204
205
206
207
208 if (res) {
209 base = devm_ioremap_resource(dev, res);
210 if (IS_ERR(base)) {
211 ret = PTR_ERR(base);
212 goto out_disable_clk;
213 }
214 drvdata->base = base;
215 desc.groups = replicator_groups;
216 }
217
218 dev_set_drvdata(dev, drvdata);
219
220 pdata = coresight_get_platform_data(dev);
221 if (IS_ERR(pdata)) {
222 ret = PTR_ERR(pdata);
223 goto out_disable_clk;
224 }
225 dev->platform_data = pdata;
226
227 desc.type = CORESIGHT_DEV_TYPE_LINK;
228 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
229 desc.ops = &replicator_cs_ops;
230 desc.pdata = dev->platform_data;
231 desc.dev = dev;
232
233 drvdata->csdev = coresight_register(&desc);
234 if (IS_ERR(drvdata->csdev)) {
235 ret = PTR_ERR(drvdata->csdev);
236 goto out_disable_clk;
237 }
238
239 replicator_reset(drvdata);
240 pm_runtime_put(dev);
241
242out_disable_clk:
243 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
244 clk_disable_unprepare(drvdata->atclk);
245 return ret;
246}
247
248static int static_replicator_probe(struct platform_device *pdev)
249{
250 int ret;
251
252 pm_runtime_get_noresume(&pdev->dev);
253 pm_runtime_set_active(&pdev->dev);
254 pm_runtime_enable(&pdev->dev);
255
256
257 ret = replicator_probe(&pdev->dev, NULL);
258
259 if (ret) {
260 pm_runtime_put_noidle(&pdev->dev);
261 pm_runtime_disable(&pdev->dev);
262 }
263
264 return ret;
265}
266
267#ifdef CONFIG_PM
268static int replicator_runtime_suspend(struct device *dev)
269{
270 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
271
272 if (drvdata && !IS_ERR(drvdata->atclk))
273 clk_disable_unprepare(drvdata->atclk);
274
275 return 0;
276}
277
278static int replicator_runtime_resume(struct device *dev)
279{
280 struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
281
282 if (drvdata && !IS_ERR(drvdata->atclk))
283 clk_prepare_enable(drvdata->atclk);
284
285 return 0;
286}
287#endif
288
289static const struct dev_pm_ops replicator_dev_pm_ops = {
290 SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
291 replicator_runtime_resume, NULL)
292};
293
294static const struct of_device_id static_replicator_match[] = {
295 {.compatible = "arm,coresight-replicator"},
296 {.compatible = "arm,coresight-static-replicator"},
297 {}
298};
299
300#ifdef CONFIG_ACPI
301static const struct acpi_device_id static_replicator_acpi_ids[] = {
302 {"ARMHC985", 0},
303 {}
304};
305#endif
306
307static struct platform_driver static_replicator_driver = {
308 .probe = static_replicator_probe,
309 .driver = {
310 .name = "coresight-static-replicator",
311 .of_match_table = of_match_ptr(static_replicator_match),
312 .acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
313 .pm = &replicator_dev_pm_ops,
314 .suppress_bind_attrs = true,
315 },
316};
317builtin_platform_driver(static_replicator_driver);
318
319static int dynamic_replicator_probe(struct amba_device *adev,
320 const struct amba_id *id)
321{
322 return replicator_probe(&adev->dev, &adev->res);
323}
324
325static const struct amba_id dynamic_replicator_ids[] = {
326 {
327 .id = 0x000bb909,
328 .mask = 0x000fffff,
329 },
330 {
331
332 .id = 0x000bb9ec,
333 .mask = 0x000fffff,
334 },
335 { 0, 0 },
336};
337
338static struct amba_driver dynamic_replicator_driver = {
339 .drv = {
340 .name = "coresight-dynamic-replicator",
341 .pm = &replicator_dev_pm_ops,
342 .suppress_bind_attrs = true,
343 },
344 .probe = dynamic_replicator_probe,
345 .id_table = dynamic_replicator_ids,
346};
347builtin_amba_driver(dynamic_replicator_driver);
348
