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1/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
2 *
3 * Description: CoreSight Funnel driver
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 and
7 * only version 2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/device.h>
19#include <linux/err.h>
20#include <linux/fs.h>
21#include <linux/slab.h>
22#include <linux/pm_runtime.h>
23#include <linux/coresight.h>
24#include <linux/amba/bus.h>
25#include <linux/clk.h>
26
27#include "coresight-priv.h"
28
29#define FUNNEL_FUNCTL 0x000
30#define FUNNEL_PRICTL 0x004
31
32#define FUNNEL_HOLDTIME_MASK 0xf00
33#define FUNNEL_HOLDTIME_SHFT 0x8
34#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
35
36/**
37 * struct funnel_drvdata - specifics associated to a funnel component
38 * @base: memory mapped base address for this component.
39 * @dev: the device entity associated to this component.
40 * @atclk: optional clock for the core parts of the funnel.
41 * @csdev: component vitals needed by the framework.
42 * @priority: port selection order.
43 */
44struct funnel_drvdata {
45 void __iomem *base;
46 struct device *dev;
47 struct clk *atclk;
48 struct coresight_device *csdev;
49 unsigned long priority;
50};
51
52static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
53{
54 u32 functl;
55
56 CS_UNLOCK(drvdata->base);
57
58 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
59 functl &= ~FUNNEL_HOLDTIME_MASK;
60 functl |= FUNNEL_HOLDTIME;
61 functl |= (1 << port);
62 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
63 writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
64
65 CS_LOCK(drvdata->base);
66}
67
68static int funnel_enable(struct coresight_device *csdev, int inport,
69 int outport)
70{
71 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
72
73 funnel_enable_hw(drvdata, inport);
74
75 dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
76 return 0;
77}
78
79static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
80{
81 u32 functl;
82
83 CS_UNLOCK(drvdata->base);
84
85 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
86 functl &= ~(1 << inport);
87 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
88
89 CS_LOCK(drvdata->base);
90}
91
92static void funnel_disable(struct coresight_device *csdev, int inport,
93 int outport)
94{
95 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
96
97 funnel_disable_hw(drvdata, inport);
98
99 dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
100}
101
102static const struct coresight_ops_link funnel_link_ops = {
103 .enable = funnel_enable,
104 .disable = funnel_disable,
105};
106
107static const struct coresight_ops funnel_cs_ops = {
108 .link_ops = &funnel_link_ops,
109};
110
111static ssize_t priority_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
115 unsigned long val = drvdata->priority;
116
117 return sprintf(buf, "%#lx\n", val);
118}
119
120static ssize_t priority_store(struct device *dev,
121 struct device_attribute *attr,
122 const char *buf, size_t size)
123{
124 int ret;
125 unsigned long val;
126 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
127
128 ret = kstrtoul(buf, 16, &val);
129 if (ret)
130 return ret;
131
132 drvdata->priority = val;
133 return size;
134}
135static DEVICE_ATTR_RW(priority);
136
137static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
138{
139 u32 functl;
140
141 CS_UNLOCK(drvdata->base);
142 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
143 CS_LOCK(drvdata->base);
144
145 return functl;
146}
147
148static ssize_t funnel_ctrl_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
150{
151 u32 val;
152 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
153
154 pm_runtime_get_sync(drvdata->dev);
155
156 val = get_funnel_ctrl_hw(drvdata);
157
158 pm_runtime_put(drvdata->dev);
159
160 return sprintf(buf, "%#x\n", val);
161}
162static DEVICE_ATTR_RO(funnel_ctrl);
163
164static struct attribute *coresight_funnel_attrs[] = {
165 &dev_attr_funnel_ctrl.attr,
166 &dev_attr_priority.attr,
167 NULL,
168};
169ATTRIBUTE_GROUPS(coresight_funnel);
170
171static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
172{
173 int ret;
174 void __iomem *base;
175 struct device *dev = &adev->dev;
176 struct coresight_platform_data *pdata = NULL;
177 struct funnel_drvdata *drvdata;
178 struct resource *res = &adev->res;
179 struct coresight_desc *desc;
180 struct device_node *np = adev->dev.of_node;
181
182 if (np) {
183 pdata = of_get_coresight_platform_data(dev, np);
184 if (IS_ERR(pdata))
185 return PTR_ERR(pdata);
186 adev->dev.platform_data = pdata;
187 }
188
189 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
190 if (!drvdata)
191 return -ENOMEM;
192
193 drvdata->dev = &adev->dev;
194 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
195 if (!IS_ERR(drvdata->atclk)) {
196 ret = clk_prepare_enable(drvdata->atclk);
197 if (ret)
198 return ret;
199 }
200 dev_set_drvdata(dev, drvdata);
201
202 /* Validity for the resource is already checked by the AMBA core */
203 base = devm_ioremap_resource(dev, res);
204 if (IS_ERR(base))
205 return PTR_ERR(base);
206
207 drvdata->base = base;
208 pm_runtime_put(&adev->dev);
209
210 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
211 if (!desc)
212 return -ENOMEM;
213
214 desc->type = CORESIGHT_DEV_TYPE_LINK;
215 desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
216 desc->ops = &funnel_cs_ops;
217 desc->pdata = pdata;
218 desc->dev = dev;
219 desc->groups = coresight_funnel_groups;
220 drvdata->csdev = coresight_register(desc);
221 if (IS_ERR(drvdata->csdev))
222 return PTR_ERR(drvdata->csdev);
223
224 dev_info(dev, "FUNNEL initialized\n");
225 return 0;
226}
227
228#ifdef CONFIG_PM
229static int funnel_runtime_suspend(struct device *dev)
230{
231 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
232
233 if (drvdata && !IS_ERR(drvdata->atclk))
234 clk_disable_unprepare(drvdata->atclk);
235
236 return 0;
237}
238
239static int funnel_runtime_resume(struct device *dev)
240{
241 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
242
243 if (drvdata && !IS_ERR(drvdata->atclk))
244 clk_prepare_enable(drvdata->atclk);
245
246 return 0;
247}
248#endif
249
250static const struct dev_pm_ops funnel_dev_pm_ops = {
251 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
252};
253
254static struct amba_id funnel_ids[] = {
255 {
256 .id = 0x0003b908,
257 .mask = 0x0003ffff,
258 },
259 { 0, 0},
260};
261
262static struct amba_driver funnel_driver = {
263 .drv = {
264 .name = "coresight-funnel",
265 .owner = THIS_MODULE,
266 .pm = &funnel_dev_pm_ops,
267 .suppress_bind_attrs = true,
268 },
269 .probe = funnel_probe,
270 .id_table = funnel_ids,
271};
272builtin_amba_driver(funnel_driver);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
4 *
5 * Description: CoreSight Funnel driver
6 */
7
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
33DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
34
35/**
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.
42 */
43struct 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
51static 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 /* Claim the device only when we enable the first slave */
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);
71done:
72 CS_LOCK(drvdata->base);
73 return rc;
74}
75
76static 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
100static 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 /* Disclaim the device if none of the slaves are now active */
112 if (!(functl & FUNNEL_ENSx_MASK))
113 coresight_disclaim_device_unlocked(drvdata->base);
114
115 CS_LOCK(drvdata->base);
116}
117
118static 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
137static const struct coresight_ops_link funnel_link_ops = {
138 .enable = funnel_enable,
139 .disable = funnel_disable,
140};
141
142static const struct coresight_ops funnel_cs_ops = {
143 .link_ops = &funnel_link_ops,
144};
145
146static 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
155static 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}
170static DEVICE_ATTR_RW(priority);
171
172static 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
183static 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}
197static DEVICE_ATTR_RO(funnel_ctrl);
198
199static struct attribute *coresight_funnel_attrs[] = {
200 &dev_attr_funnel_ctrl.attr,
201 &dev_attr_priority.attr,
202 NULL,
203};
204ATTRIBUTE_GROUPS(coresight_funnel);
205
206static 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"); /* optional */
227 if (!IS_ERR(drvdata->atclk)) {
228 ret = clk_prepare_enable(drvdata->atclk);
229 if (ret)
230 return ret;
231 }
232
233 /*
234 * Map the device base for dynamic-funnel, which has been
235 * validated by AMBA core.
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 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;
260 desc.pdata = pdata;
261 desc.dev = dev;
262 drvdata->csdev = coresight_register(&desc);
263 if (IS_ERR(drvdata->csdev)) {
264 ret = PTR_ERR(drvdata->csdev);
265 goto out_disable_clk;
266 }
267
268 pm_runtime_put(dev);
269 ret = 0;
270
271out_disable_clk:
272 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
273 clk_disable_unprepare(drvdata->atclk);
274 return ret;
275}
276
277#ifdef CONFIG_PM
278static int funnel_runtime_suspend(struct device *dev)
279{
280 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
281
282 if (drvdata && !IS_ERR(drvdata->atclk))
283 clk_disable_unprepare(drvdata->atclk);
284
285 return 0;
286}
287
288static int funnel_runtime_resume(struct device *dev)
289{
290 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
291
292 if (drvdata && !IS_ERR(drvdata->atclk))
293 clk_prepare_enable(drvdata->atclk);
294
295 return 0;
296}
297#endif
298
299static const struct dev_pm_ops funnel_dev_pm_ops = {
300 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
301};
302
303static int static_funnel_probe(struct platform_device *pdev)
304{
305 int ret;
306
307 pm_runtime_get_noresume(&pdev->dev);
308 pm_runtime_set_active(&pdev->dev);
309 pm_runtime_enable(&pdev->dev);
310
311 /* Static funnel do not have programming base */
312 ret = funnel_probe(&pdev->dev, NULL);
313
314 if (ret) {
315 pm_runtime_put_noidle(&pdev->dev);
316 pm_runtime_disable(&pdev->dev);
317 }
318
319 return ret;
320}
321
322static const struct of_device_id static_funnel_match[] = {
323 {.compatible = "arm,coresight-static-funnel"},
324 {}
325};
326
327#ifdef CONFIG_ACPI
328static const struct acpi_device_id static_funnel_ids[] = {
329 {"ARMHC9FE", 0},
330 {},
331};
332#endif
333
334static struct platform_driver static_funnel_driver = {
335 .probe = static_funnel_probe,
336 .driver = {
337 .name = "coresight-static-funnel",
338 .of_match_table = static_funnel_match,
339 .acpi_match_table = ACPI_PTR(static_funnel_ids),
340 .pm = &funnel_dev_pm_ops,
341 .suppress_bind_attrs = true,
342 },
343};
344builtin_platform_driver(static_funnel_driver);
345
346static int dynamic_funnel_probe(struct amba_device *adev,
347 const struct amba_id *id)
348{
349 return funnel_probe(&adev->dev, &adev->res);
350}
351
352static const struct amba_id dynamic_funnel_ids[] = {
353 {
354 .id = 0x000bb908,
355 .mask = 0x000fffff,
356 },
357 {
358 /* Coresight SoC-600 */
359 .id = 0x000bb9eb,
360 .mask = 0x000fffff,
361 },
362 { 0, 0},
363};
364
365static struct amba_driver dynamic_funnel_driver = {
366 .drv = {
367 .name = "coresight-dynamic-funnel",
368 .owner = THIS_MODULE,
369 .pm = &funnel_dev_pm_ops,
370 .suppress_bind_attrs = true,
371 },
372 .probe = dynamic_funnel_probe,
373 .id_table = dynamic_funnel_ids,
374};
375builtin_amba_driver(dynamic_funnel_driver);