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6e21e345 | 1 | /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. |
941943cf PG |
2 | * |
3 | * Description: CoreSight Funnel driver | |
6e21e345 PP |
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> | |
6e21e345 PP |
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> | |
e2d08f96 | 22 | #include <linux/pm_runtime.h> |
6e21e345 PP |
23 | #include <linux/coresight.h> |
24 | #include <linux/amba/bus.h> | |
2e5f75d1 | 25 | #include <linux/clk.h> |
6e21e345 PP |
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. | |
2e5f75d1 | 40 | * @atclk: optional clock for the core parts of the funnel. |
6e21e345 | 41 | * @csdev: component vitals needed by the framework. |
6e21e345 PP |
42 | * @priority: port selection order. |
43 | */ | |
44 | struct funnel_drvdata { | |
45 | void __iomem *base; | |
46 | struct device *dev; | |
2e5f75d1 | 47 | struct clk *atclk; |
6e21e345 | 48 | struct coresight_device *csdev; |
6e21e345 PP |
49 | unsigned long priority; |
50 | }; | |
51 | ||
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 | ||
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); | |
6e21e345 PP |
72 | |
73 | funnel_enable_hw(drvdata, inport); | |
74 | ||
75 | dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); | |
76 | return 0; | |
77 | } | |
78 | ||
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 | ||
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); | |
6e21e345 PP |
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 | ||
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 | ||
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 | ||
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 | ||
148 | static ssize_t funnel_ctrl_show(struct device *dev, | |
149 | struct device_attribute *attr, char *buf) | |
150 | { | |
6e21e345 PP |
151 | u32 val; |
152 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); | |
153 | ||
e2d08f96 | 154 | pm_runtime_get_sync(drvdata->dev); |
6e21e345 PP |
155 | |
156 | val = get_funnel_ctrl_hw(drvdata); | |
e2d08f96 LW |
157 | |
158 | pm_runtime_put(drvdata->dev); | |
6e21e345 PP |
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 | ||
171 | static int funnel_probe(struct amba_device *adev, const struct amba_id *id) | |
172 | { | |
2e5f75d1 | 173 | int ret; |
6e21e345 PP |
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; | |
2e5f75d1 LW |
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 | } | |
6e21e345 PP |
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; | |
e2d08f96 | 208 | pm_runtime_put(&adev->dev); |
6e21e345 PP |
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 | ||
6e21e345 PP |
224 | return 0; |
225 | } | |
226 | ||
2e5f75d1 LW |
227 | #ifdef CONFIG_PM |
228 | static int funnel_runtime_suspend(struct device *dev) | |
229 | { | |
230 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev); | |
231 | ||
232 | if (drvdata && !IS_ERR(drvdata->atclk)) | |
233 | clk_disable_unprepare(drvdata->atclk); | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int funnel_runtime_resume(struct device *dev) | |
239 | { | |
240 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev); | |
241 | ||
242 | if (drvdata && !IS_ERR(drvdata->atclk)) | |
243 | clk_prepare_enable(drvdata->atclk); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | #endif | |
248 | ||
249 | static const struct dev_pm_ops funnel_dev_pm_ops = { | |
250 | SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL) | |
251 | }; | |
252 | ||
6e21e345 PP |
253 | static struct amba_id funnel_ids[] = { |
254 | { | |
255 | .id = 0x0003b908, | |
256 | .mask = 0x0003ffff, | |
257 | }, | |
258 | { 0, 0}, | |
259 | }; | |
260 | ||
261 | static struct amba_driver funnel_driver = { | |
262 | .drv = { | |
263 | .name = "coresight-funnel", | |
264 | .owner = THIS_MODULE, | |
2e5f75d1 | 265 | .pm = &funnel_dev_pm_ops, |
b15f0fb6 | 266 | .suppress_bind_attrs = true, |
6e21e345 PP |
267 | }, |
268 | .probe = funnel_probe, | |
6e21e345 PP |
269 | .id_table = funnel_ids, |
270 | }; | |
941943cf | 271 | builtin_amba_driver(funnel_driver); |