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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 * @pclk: APB clock if present, otherwise NULL
40 * @csdev: component vitals needed by the framework.
41 * @priority: port selection order.
42 * @spinlock: serialize enable/disable operations.
43 */
44struct funnel_drvdata {
45 void __iomem *base;
46 struct clk *atclk;
47 struct clk *pclk;
48 struct coresight_device *csdev;
49 unsigned long priority;
50 spinlock_t spinlock;
51};
52
53static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
54{
55 u32 functl;
56 int rc = 0;
57 struct coresight_device *csdev = drvdata->csdev;
58
59 CS_UNLOCK(drvdata->base);
60
61 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
62 /* Claim the device only when we enable the first slave */
63 if (!(functl & FUNNEL_ENSx_MASK)) {
64 rc = coresight_claim_device_unlocked(csdev);
65 if (rc)
66 goto done;
67 }
68
69 functl &= ~FUNNEL_HOLDTIME_MASK;
70 functl |= FUNNEL_HOLDTIME;
71 functl |= (1 << port);
72 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
73 writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
74done:
75 CS_LOCK(drvdata->base);
76 return rc;
77}
78
79static int funnel_enable(struct coresight_device *csdev,
80 struct coresight_connection *in,
81 struct coresight_connection *out)
82{
83 int rc = 0;
84 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
85 unsigned long flags;
86 bool first_enable = false;
87
88 spin_lock_irqsave(&drvdata->spinlock, flags);
89 if (atomic_read(&in->dest_refcnt) == 0) {
90 if (drvdata->base)
91 rc = dynamic_funnel_enable_hw(drvdata, in->dest_port);
92 if (!rc)
93 first_enable = true;
94 }
95 if (!rc)
96 atomic_inc(&in->dest_refcnt);
97 spin_unlock_irqrestore(&drvdata->spinlock, flags);
98
99 if (first_enable)
100 dev_dbg(&csdev->dev, "FUNNEL inport %d enabled\n",
101 in->dest_port);
102 return rc;
103}
104
105static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
106 int inport)
107{
108 u32 functl;
109 struct coresight_device *csdev = drvdata->csdev;
110
111 CS_UNLOCK(drvdata->base);
112
113 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
114 functl &= ~(1 << inport);
115 writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
116
117 /* Disclaim the device if none of the slaves are now active */
118 if (!(functl & FUNNEL_ENSx_MASK))
119 coresight_disclaim_device_unlocked(csdev);
120
121 CS_LOCK(drvdata->base);
122}
123
124static void funnel_disable(struct coresight_device *csdev,
125 struct coresight_connection *in,
126 struct coresight_connection *out)
127{
128 struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
129 unsigned long flags;
130 bool last_disable = false;
131
132 spin_lock_irqsave(&drvdata->spinlock, flags);
133 if (atomic_dec_return(&in->dest_refcnt) == 0) {
134 if (drvdata->base)
135 dynamic_funnel_disable_hw(drvdata, in->dest_port);
136 last_disable = true;
137 }
138 spin_unlock_irqrestore(&drvdata->spinlock, flags);
139
140 if (last_disable)
141 dev_dbg(&csdev->dev, "FUNNEL inport %d disabled\n",
142 in->dest_port);
143}
144
145static const struct coresight_ops_link funnel_link_ops = {
146 .enable = funnel_enable,
147 .disable = funnel_disable,
148};
149
150static const struct coresight_ops funnel_cs_ops = {
151 .link_ops = &funnel_link_ops,
152};
153
154static ssize_t priority_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156{
157 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
158 unsigned long val = drvdata->priority;
159
160 return sprintf(buf, "%#lx\n", val);
161}
162
163static ssize_t priority_store(struct device *dev,
164 struct device_attribute *attr,
165 const char *buf, size_t size)
166{
167 int ret;
168 unsigned long val;
169 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
170
171 ret = kstrtoul(buf, 16, &val);
172 if (ret)
173 return ret;
174
175 drvdata->priority = val;
176 return size;
177}
178static DEVICE_ATTR_RW(priority);
179
180static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
181{
182 u32 functl;
183
184 CS_UNLOCK(drvdata->base);
185 functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
186 CS_LOCK(drvdata->base);
187
188 return functl;
189}
190
191static ssize_t funnel_ctrl_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 u32 val;
195 struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
196
197 pm_runtime_get_sync(dev->parent);
198
199 val = get_funnel_ctrl_hw(drvdata);
200
201 pm_runtime_put(dev->parent);
202
203 return sprintf(buf, "%#x\n", val);
204}
205static DEVICE_ATTR_RO(funnel_ctrl);
206
207static struct attribute *coresight_funnel_attrs[] = {
208 &dev_attr_funnel_ctrl.attr,
209 &dev_attr_priority.attr,
210 NULL,
211};
212ATTRIBUTE_GROUPS(coresight_funnel);
213
214static int funnel_probe(struct device *dev, struct resource *res)
215{
216 int ret;
217 void __iomem *base;
218 struct coresight_platform_data *pdata = NULL;
219 struct funnel_drvdata *drvdata;
220 struct coresight_desc desc = { 0 };
221
222 if (is_of_node(dev_fwnode(dev)) &&
223 of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
224 dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
225
226 desc.name = coresight_alloc_device_name(&funnel_devs, dev);
227 if (!desc.name)
228 return -ENOMEM;
229
230 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
231 if (!drvdata)
232 return -ENOMEM;
233
234 drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
235 if (!IS_ERR(drvdata->atclk)) {
236 ret = clk_prepare_enable(drvdata->atclk);
237 if (ret)
238 return ret;
239 }
240
241 drvdata->pclk = coresight_get_enable_apb_pclk(dev);
242 if (IS_ERR(drvdata->pclk))
243 return -ENODEV;
244
245 /*
246 * Map the device base for dynamic-funnel, which has been
247 * validated by AMBA core.
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 = coresight_funnel_groups;
257 desc.access = CSDEV_ACCESS_IOMEM(base);
258 }
259
260 dev_set_drvdata(dev, drvdata);
261
262 pdata = coresight_get_platform_data(dev);
263 if (IS_ERR(pdata)) {
264 ret = PTR_ERR(pdata);
265 goto out_disable_clk;
266 }
267 dev->platform_data = pdata;
268
269 spin_lock_init(&drvdata->spinlock);
270 desc.type = CORESIGHT_DEV_TYPE_LINK;
271 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
272 desc.ops = &funnel_cs_ops;
273 desc.pdata = pdata;
274 desc.dev = dev;
275 drvdata->csdev = coresight_register(&desc);
276 if (IS_ERR(drvdata->csdev)) {
277 ret = PTR_ERR(drvdata->csdev);
278 goto out_disable_clk;
279 }
280
281 ret = 0;
282
283out_disable_clk:
284 if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
285 clk_disable_unprepare(drvdata->atclk);
286 if (ret && !IS_ERR_OR_NULL(drvdata->pclk))
287 clk_disable_unprepare(drvdata->pclk);
288 return ret;
289}
290
291static int funnel_remove(struct device *dev)
292{
293 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
294
295 coresight_unregister(drvdata->csdev);
296
297 return 0;
298}
299
300#ifdef CONFIG_PM
301static int funnel_runtime_suspend(struct device *dev)
302{
303 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
304
305 if (drvdata && !IS_ERR(drvdata->atclk))
306 clk_disable_unprepare(drvdata->atclk);
307
308 if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
309 clk_disable_unprepare(drvdata->pclk);
310
311 return 0;
312}
313
314static int funnel_runtime_resume(struct device *dev)
315{
316 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
317
318 if (drvdata && !IS_ERR(drvdata->atclk))
319 clk_prepare_enable(drvdata->atclk);
320
321 if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
322 clk_prepare_enable(drvdata->pclk);
323 return 0;
324}
325#endif
326
327static const struct dev_pm_ops funnel_dev_pm_ops = {
328 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
329};
330
331static int funnel_platform_probe(struct platform_device *pdev)
332{
333 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
334 int ret;
335
336 pm_runtime_get_noresume(&pdev->dev);
337 pm_runtime_set_active(&pdev->dev);
338 pm_runtime_enable(&pdev->dev);
339
340 ret = funnel_probe(&pdev->dev, res);
341 pm_runtime_put(&pdev->dev);
342 if (ret)
343 pm_runtime_disable(&pdev->dev);
344
345 return ret;
346}
347
348static void funnel_platform_remove(struct platform_device *pdev)
349{
350 struct funnel_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
351
352 if (WARN_ON(!drvdata))
353 return;
354
355 funnel_remove(&pdev->dev);
356 pm_runtime_disable(&pdev->dev);
357 if (!IS_ERR_OR_NULL(drvdata->pclk))
358 clk_put(drvdata->pclk);
359}
360
361static const struct of_device_id funnel_match[] = {
362 {.compatible = "arm,coresight-static-funnel"},
363 {}
364};
365
366MODULE_DEVICE_TABLE(of, funnel_match);
367
368#ifdef CONFIG_ACPI
369static const struct acpi_device_id funnel_acpi_ids[] = {
370 {"ARMHC9FE", 0, 0, 0}, /* ARM Coresight Static Funnel */
371 {"ARMHC9FF", 0, 0, 0}, /* ARM CoreSight Dynamic Funnel */
372 {},
373};
374
375MODULE_DEVICE_TABLE(acpi, funnel_acpi_ids);
376#endif
377
378static struct platform_driver funnel_driver = {
379 .probe = funnel_platform_probe,
380 .remove = funnel_platform_remove,
381 .driver = {
382 .name = "coresight-funnel",
383 /* THIS_MODULE is taken care of by platform_driver_register() */
384 .of_match_table = funnel_match,
385 .acpi_match_table = ACPI_PTR(funnel_acpi_ids),
386 .pm = &funnel_dev_pm_ops,
387 .suppress_bind_attrs = true,
388 },
389};
390
391static int dynamic_funnel_probe(struct amba_device *adev,
392 const struct amba_id *id)
393{
394 int ret;
395
396 ret = funnel_probe(&adev->dev, &adev->res);
397 if (!ret)
398 pm_runtime_put(&adev->dev);
399
400 return ret;
401}
402
403static void dynamic_funnel_remove(struct amba_device *adev)
404{
405 funnel_remove(&adev->dev);
406}
407
408static const struct amba_id dynamic_funnel_ids[] = {
409 {
410 .id = 0x000bb908,
411 .mask = 0x000fffff,
412 },
413 {
414 /* Coresight SoC-600 */
415 .id = 0x000bb9eb,
416 .mask = 0x000fffff,
417 },
418 { 0, 0, NULL },
419};
420
421MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
422
423static struct amba_driver dynamic_funnel_driver = {
424 .drv = {
425 .name = "coresight-dynamic-funnel",
426 .pm = &funnel_dev_pm_ops,
427 .suppress_bind_attrs = true,
428 },
429 .probe = dynamic_funnel_probe,
430 .remove = dynamic_funnel_remove,
431 .id_table = dynamic_funnel_ids,
432};
433
434static int __init funnel_init(void)
435{
436 return coresight_init_driver("funnel", &dynamic_funnel_driver, &funnel_driver);
437}
438
439static void __exit funnel_exit(void)
440{
441 coresight_remove_driver(&dynamic_funnel_driver, &funnel_driver);
442}
443
444module_init(funnel_init);
445module_exit(funnel_exit);
446
447MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
448MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
449MODULE_DESCRIPTION("Arm CoreSight Funnel Driver");
450MODULE_LICENSE("GPL v2");