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1 | /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/coresight.h> | |
23 | #include <linux/amba/bus.h> | |
24 | ||
25 | #include "coresight-priv.h" | |
26 | ||
27 | #define FUNNEL_FUNCTL 0x000 | |
28 | #define FUNNEL_PRICTL 0x004 | |
29 | ||
30 | #define FUNNEL_HOLDTIME_MASK 0xf00 | |
31 | #define FUNNEL_HOLDTIME_SHFT 0x8 | |
32 | #define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT) | |
33 | ||
34 | /** | |
35 | * struct funnel_drvdata - specifics associated to a funnel component | |
36 | * @base: memory mapped base address for this component. | |
37 | * @dev: the device entity associated to this component. | |
38 | * @csdev: component vitals needed by the framework. | |
39 | * @clk: the clock this component is associated to. | |
40 | * @priority: port selection order. | |
41 | */ | |
42 | struct funnel_drvdata { | |
43 | void __iomem *base; | |
44 | struct device *dev; | |
45 | struct coresight_device *csdev; | |
46 | struct clk *clk; | |
47 | unsigned long priority; | |
48 | }; | |
49 | ||
50 | static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port) | |
51 | { | |
52 | u32 functl; | |
53 | ||
54 | CS_UNLOCK(drvdata->base); | |
55 | ||
56 | functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); | |
57 | functl &= ~FUNNEL_HOLDTIME_MASK; | |
58 | functl |= FUNNEL_HOLDTIME; | |
59 | functl |= (1 << port); | |
60 | writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL); | |
61 | writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL); | |
62 | ||
63 | CS_LOCK(drvdata->base); | |
64 | } | |
65 | ||
66 | static int funnel_enable(struct coresight_device *csdev, int inport, | |
67 | int outport) | |
68 | { | |
69 | struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
70 | int ret; | |
71 | ||
72 | ret = clk_prepare_enable(drvdata->clk); | |
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | funnel_enable_hw(drvdata, inport); | |
77 | ||
78 | dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport) | |
83 | { | |
84 | u32 functl; | |
85 | ||
86 | CS_UNLOCK(drvdata->base); | |
87 | ||
88 | functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); | |
89 | functl &= ~(1 << inport); | |
90 | writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL); | |
91 | ||
92 | CS_LOCK(drvdata->base); | |
93 | } | |
94 | ||
95 | static void funnel_disable(struct coresight_device *csdev, int inport, | |
96 | int outport) | |
97 | { | |
98 | struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); | |
99 | ||
100 | funnel_disable_hw(drvdata, inport); | |
101 | ||
102 | clk_disable_unprepare(drvdata->clk); | |
103 | ||
104 | dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport); | |
105 | } | |
106 | ||
107 | static const struct coresight_ops_link funnel_link_ops = { | |
108 | .enable = funnel_enable, | |
109 | .disable = funnel_disable, | |
110 | }; | |
111 | ||
112 | static const struct coresight_ops funnel_cs_ops = { | |
113 | .link_ops = &funnel_link_ops, | |
114 | }; | |
115 | ||
116 | static ssize_t priority_show(struct device *dev, | |
117 | struct device_attribute *attr, char *buf) | |
118 | { | |
119 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); | |
120 | unsigned long val = drvdata->priority; | |
121 | ||
122 | return sprintf(buf, "%#lx\n", val); | |
123 | } | |
124 | ||
125 | static ssize_t priority_store(struct device *dev, | |
126 | struct device_attribute *attr, | |
127 | const char *buf, size_t size) | |
128 | { | |
129 | int ret; | |
130 | unsigned long val; | |
131 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); | |
132 | ||
133 | ret = kstrtoul(buf, 16, &val); | |
134 | if (ret) | |
135 | return ret; | |
136 | ||
137 | drvdata->priority = val; | |
138 | return size; | |
139 | } | |
140 | static DEVICE_ATTR_RW(priority); | |
141 | ||
142 | static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata) | |
143 | { | |
144 | u32 functl; | |
145 | ||
146 | CS_UNLOCK(drvdata->base); | |
147 | functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL); | |
148 | CS_LOCK(drvdata->base); | |
149 | ||
150 | return functl; | |
151 | } | |
152 | ||
153 | static ssize_t funnel_ctrl_show(struct device *dev, | |
154 | struct device_attribute *attr, char *buf) | |
155 | { | |
156 | int ret; | |
157 | u32 val; | |
158 | struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); | |
159 | ||
160 | ret = clk_prepare_enable(drvdata->clk); | |
161 | if (ret) | |
162 | return ret; | |
163 | ||
164 | val = get_funnel_ctrl_hw(drvdata); | |
165 | clk_disable_unprepare(drvdata->clk); | |
166 | ||
167 | return sprintf(buf, "%#x\n", val); | |
168 | } | |
169 | static DEVICE_ATTR_RO(funnel_ctrl); | |
170 | ||
171 | static struct attribute *coresight_funnel_attrs[] = { | |
172 | &dev_attr_funnel_ctrl.attr, | |
173 | &dev_attr_priority.attr, | |
174 | NULL, | |
175 | }; | |
176 | ATTRIBUTE_GROUPS(coresight_funnel); | |
177 | ||
178 | static int funnel_probe(struct amba_device *adev, const struct amba_id *id) | |
179 | { | |
180 | void __iomem *base; | |
181 | struct device *dev = &adev->dev; | |
182 | struct coresight_platform_data *pdata = NULL; | |
183 | struct funnel_drvdata *drvdata; | |
184 | struct resource *res = &adev->res; | |
185 | struct coresight_desc *desc; | |
186 | struct device_node *np = adev->dev.of_node; | |
187 | ||
188 | if (np) { | |
189 | pdata = of_get_coresight_platform_data(dev, np); | |
190 | if (IS_ERR(pdata)) | |
191 | return PTR_ERR(pdata); | |
192 | adev->dev.platform_data = pdata; | |
193 | } | |
194 | ||
195 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); | |
196 | if (!drvdata) | |
197 | return -ENOMEM; | |
198 | ||
199 | drvdata->dev = &adev->dev; | |
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 | ||
209 | drvdata->clk = adev->pclk; | |
210 | ||
211 | desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); | |
212 | if (!desc) | |
213 | return -ENOMEM; | |
214 | ||
215 | desc->type = CORESIGHT_DEV_TYPE_LINK; | |
216 | desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; | |
217 | desc->ops = &funnel_cs_ops; | |
218 | desc->pdata = pdata; | |
219 | desc->dev = dev; | |
220 | desc->groups = coresight_funnel_groups; | |
221 | drvdata->csdev = coresight_register(desc); | |
222 | if (IS_ERR(drvdata->csdev)) | |
223 | return PTR_ERR(drvdata->csdev); | |
224 | ||
225 | dev_info(dev, "FUNNEL initialized\n"); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static int funnel_remove(struct amba_device *adev) | |
230 | { | |
231 | struct funnel_drvdata *drvdata = amba_get_drvdata(adev); | |
232 | ||
233 | coresight_unregister(drvdata->csdev); | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static struct amba_id funnel_ids[] = { | |
238 | { | |
239 | .id = 0x0003b908, | |
240 | .mask = 0x0003ffff, | |
241 | }, | |
242 | { 0, 0}, | |
243 | }; | |
244 | ||
245 | static struct amba_driver funnel_driver = { | |
246 | .drv = { | |
247 | .name = "coresight-funnel", | |
248 | .owner = THIS_MODULE, | |
249 | }, | |
250 | .probe = funnel_probe, | |
251 | .remove = funnel_remove, | |
252 | .id_table = funnel_ids, | |
253 | }; | |
254 | ||
255 | static int __init funnel_init(void) | |
256 | { | |
257 | return amba_driver_register(&funnel_driver); | |
258 | } | |
259 | module_init(funnel_init); | |
260 | ||
261 | static void __exit funnel_exit(void) | |
262 | { | |
263 | amba_driver_unregister(&funnel_driver); | |
264 | } | |
265 | module_exit(funnel_exit); | |
266 | ||
267 | MODULE_LICENSE("GPL v2"); | |
268 | MODULE_DESCRIPTION("CoreSight Funnel driver"); |