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 */
44 struct 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
funnel_enable_hw(struct funnel_drvdata * drvdata,int port)52 static 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
funnel_enable(struct coresight_device * csdev,int inport,int outport)68 static 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
funnel_disable_hw(struct funnel_drvdata * drvdata,int inport)79 static 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
funnel_disable(struct coresight_device * csdev,int inport,int outport)92 static 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
102 static const struct coresight_ops_link funnel_link_ops = {
103 .enable = funnel_enable,
104 .disable = funnel_disable,
105 };
106
107 static const struct coresight_ops funnel_cs_ops = {
108 .link_ops = &funnel_link_ops,
109 };
110
priority_show(struct device * dev,struct device_attribute * attr,char * buf)111 static 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
priority_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)120 static 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 }
135 static DEVICE_ATTR_RW(priority);
136
get_funnel_ctrl_hw(struct funnel_drvdata * drvdata)137 static 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
funnel_ctrl_show(struct device * dev,struct device_attribute * attr,char * buf)148 static 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 }
162 static DEVICE_ATTR_RO(funnel_ctrl);
163
164 static struct attribute *coresight_funnel_attrs[] = {
165 &dev_attr_funnel_ctrl.attr,
166 &dev_attr_priority.attr,
167 NULL,
168 };
169 ATTRIBUTE_GROUPS(coresight_funnel);
170
funnel_probe(struct amba_device * adev,const struct amba_id * id)171 static 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 = { 0 };
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.type = CORESIGHT_DEV_TYPE_LINK;
211 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
212 desc.ops = &funnel_cs_ops;
213 desc.pdata = pdata;
214 desc.dev = dev;
215 desc.groups = coresight_funnel_groups;
216 drvdata->csdev = coresight_register(&desc);
217 if (IS_ERR(drvdata->csdev))
218 return PTR_ERR(drvdata->csdev);
219
220 return 0;
221 }
222
223 #ifdef CONFIG_PM
funnel_runtime_suspend(struct device * dev)224 static int funnel_runtime_suspend(struct device *dev)
225 {
226 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
227
228 if (drvdata && !IS_ERR(drvdata->atclk))
229 clk_disable_unprepare(drvdata->atclk);
230
231 return 0;
232 }
233
funnel_runtime_resume(struct device * dev)234 static int funnel_runtime_resume(struct device *dev)
235 {
236 struct funnel_drvdata *drvdata = dev_get_drvdata(dev);
237
238 if (drvdata && !IS_ERR(drvdata->atclk))
239 clk_prepare_enable(drvdata->atclk);
240
241 return 0;
242 }
243 #endif
244
245 static const struct dev_pm_ops funnel_dev_pm_ops = {
246 SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
247 };
248
249 static struct amba_id funnel_ids[] = {
250 {
251 .id = 0x0003b908,
252 .mask = 0x0003ffff,
253 },
254 { 0, 0},
255 };
256
257 static struct amba_driver funnel_driver = {
258 .drv = {
259 .name = "coresight-funnel",
260 .owner = THIS_MODULE,
261 .pm = &funnel_dev_pm_ops,
262 .suppress_bind_attrs = true,
263 },
264 .probe = funnel_probe,
265 .id_table = funnel_ids,
266 };
267 builtin_amba_driver(funnel_driver);
268