Loading...
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 */
42struct funnel_drvdata {
43 void __iomem *base;
44 struct clk *atclk;
45 struct coresight_device *csdev;
46 unsigned long priority;
47};
48
49static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
50{
51 u32 functl;
52 int rc = 0;
53
54 CS_UNLOCK(drvdata->base);
55
56 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
57 /* Claim the device only when we enable the first slave */
58 if (!(functl & FUNNEL_ENSx_MASK)) {
59 rc = coresight_claim_device_unlocked(drvdata->base);
60 if (rc)
61 goto done;
62 }
63
64 functl &= ~FUNNEL_HOLDTIME_MASK;
65 functl |= FUNNEL_HOLDTIME;
66 functl |= (1 << port);
67 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
68 writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
69done:
70 CS_LOCK(drvdata->base);
71 return rc;
72}
73
74static int funnel_enable(struct coresight_device *csdev, int inport,
75 int outport)
76{
77 int rc = 0;
78 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
79
80 if (drvdata->base)
81 rc = dynamic_funnel_enable_hw(drvdata, inport);
82
83 if (!rc)
84 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n", inport);
85 return rc;
86}
87
88static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
89 int inport)
90{
91 u32 functl;
92
93 CS_UNLOCK(drvdata->base);
94
95 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
96 functl &= ~(1 << inport);
97 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
98
99 /* Disclaim the device if none of the slaves are now active */
100 if (!(functl & FUNNEL_ENSx_MASK))
101 coresight_disclaim_device_unlocked(drvdata->base);
102
103 CS_LOCK(drvdata->base);
104}
105
106static void funnel_disable(struct coresight_device *csdev, int inport,
107 int outport)
108{
109 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
110
111 if (drvdata->base)
112 dynamic_funnel_disable_hw(drvdata, inport);
113
114 dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n", inport);
115}
116
117static const struct coresight_ops_link funnel_link_ops = {
118 .enable = funnel_enable,
119 .disable = funnel_disable,
120};
121
122static const struct coresight_ops funnel_cs_ops = {
123 .link_ops = &funnel_link_ops,
124};
125
126static ssize_t priority_show(struct device *dev,
127 struct device_attribute *attr, char *buf)
128{
129 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
130 unsigned long val = drvdata->priority;
131
132 return sprintf(buf, "%#lx\n", val);
133}
134
135static ssize_t priority_store(struct device *dev,
136 struct device_attribute *attr,
137 const char *buf, size_t size)
138{
139 int ret;
140 unsigned long val;
141 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
142
143 ret = kstrtoul(buf, 16, &val);
144 if (ret)
145 return ret;
146
147 drvdata->priority = val;
148 return size;
149}
150static DEVICE_ATTR_RW(priority);
151
152static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
153{
154 u32 functl;
155
156 CS_UNLOCK(drvdata->base);
157 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
158 CS_LOCK(drvdata->base);
159
160 return functl;
161}
162
163static ssize_t funnel_ctrl_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 u32 val;
167 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
168
169 pm_runtime_get_sync(dev->parent);
170
171 val = get_funnel_ctrl_hw(drvdata);
172
173 pm_runtime_put(dev->parent);
174
175 return sprintf(buf, "%#x\n", val);
176}
177static DEVICE_ATTR_RO(funnel_ctrl);
178
179static struct attribute *coresight_funnel_attrs[] = {
180 &dev_attr_funnel_ctrl.attr,
181 &dev_attr_priority.attr,
182 NULL,
183};
184ATTRIBUTE_GROUPS(coresight_funnel);
185
186static int funnel_probe(struct device *dev, struct resource *res)
187{
188 int ret;
189 void __iomem *base;
190 struct coresight_platform_data *pdata = NULL;
191 struct funnel_drvdata *drvdata;
192 struct coresight_desc desc = { 0 };
193
194 if (is_of_node(dev_fwnode(dev)) &&
195 of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
196 dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
197
198 desc.name = coresight_alloc_device_name(&funnel_devs, dev);
199 if (!desc.name)
200 return -ENOMEM;
201
202 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
203 if (!drvdata)
204 return -ENOMEM;
205
206 drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
207 if (!IS_ERR(drvdata->atclk)) {
208 ret = clk_prepare_enable(drvdata->atclk);
209 if (ret)
210 return ret;
211 }
212
213 /*
214 * Map the device base for dynamic-funnel, which has been
215 * validated by AMBA core.
216 */
217 if (res) {
218 base = devm_ioremap_resource(dev, res);
219 if (IS_ERR(base)) {
220 ret = PTR_ERR(base);
221 goto out_disable_clk;
222 }
223 drvdata->base = base;
224 desc.groups = coresight_funnel_groups;
225 }
226
227 dev_set_drvdata(dev, drvdata);
228
229 pdata = coresight_get_platform_data(dev);
230 if (IS_ERR(pdata)) {
231 ret = PTR_ERR(pdata);
232 goto out_disable_clk;
233 }
234 dev->platform_data = pdata;
235
236 desc.type = CORESIGHT_DEV_TYPE_LINK;
237 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
238 desc.ops = &funnel_cs_ops;
239 desc.pdata = pdata;
240 desc.dev = dev;
241 drvdata->csdev = coresight_register(&desc);
242 if (IS_ERR(drvdata->csdev)) {
243 ret = PTR_ERR(drvdata->csdev);
244 goto out_disable_clk;
245 }
246
247 pm_runtime_put(dev);
248 ret = 0;
249
250out_disable_clk:
251 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
252 clk_disable_unprepare(drvdata->atclk);
253 return ret;
254}
255
256#ifdef CONFIG_PM
257static int funnel_runtime_suspend(struct device *dev)
258{
259 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
260
261 if (drvdata && !IS_ERR(drvdata->atclk))
262 clk_disable_unprepare(drvdata->atclk);
263
264 return 0;
265}
266
267static int funnel_runtime_resume(struct device *dev)
268{
269 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
270
271 if (drvdata && !IS_ERR(drvdata->atclk))
272 clk_prepare_enable(drvdata->atclk);
273
274 return 0;
275}
276#endif
277
278static const struct dev_pm_ops funnel_dev_pm_ops = {
279 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
280};
281
282static int static_funnel_probe(struct platform_device *pdev)
283{
284 int ret;
285
286 pm_runtime_get_noresume(&pdev->dev);
287 pm_runtime_set_active(&pdev->dev);
288 pm_runtime_enable(&pdev->dev);
289
290 /* Static funnel do not have programming base */
291 ret = funnel_probe(&pdev->dev, NULL);
292
293 if (ret) {
294 pm_runtime_put_noidle(&pdev->dev);
295 pm_runtime_disable(&pdev->dev);
296 }
297
298 return ret;
299}
300
301static const struct of_device_id static_funnel_match[] = {
302 {.compatible = "arm,coresight-static-funnel"},
303 {}
304};
305
306#ifdef CONFIG_ACPI
307static const struct acpi_device_id static_funnel_ids[] = {
308 {"ARMHC9FE", 0},
309 {},
310};
311#endif
312
313static struct platform_driver static_funnel_driver = {
314 .probe = static_funnel_probe,
315 .driver = {
316 .name = "coresight-static-funnel",
317 .of_match_table = static_funnel_match,
318 .acpi_match_table = ACPI_PTR(static_funnel_ids),
319 .pm = &funnel_dev_pm_ops,
320 .suppress_bind_attrs = true,
321 },
322};
323builtin_platform_driver(static_funnel_driver);
324
325static int dynamic_funnel_probe(struct amba_device *adev,
326 const struct amba_id *id)
327{
328 return funnel_probe(&adev->dev, &adev->res);
329}
330
331static const struct amba_id dynamic_funnel_ids[] = {
332 {
333 .id = 0x000bb908,
334 .mask = 0x000fffff,
335 },
336 {
337 /* Coresight SoC-600 */
338 .id = 0x000bb9eb,
339 .mask = 0x000fffff,
340 },
341 { 0, 0},
342};
343
344static struct amba_driver dynamic_funnel_driver = {
345 .drv = {
346 .name = "coresight-dynamic-funnel",
347 .owner = THIS_MODULE,
348 .pm = &funnel_dev_pm_ops,
349 .suppress_bind_attrs = true,
350 },
351 .probe = dynamic_funnel_probe,
352 .id_table = dynamic_funnel_ids,
353};
354builtin_amba_driver(dynamic_funnel_driver);