Merge tag 'iwlwifi-next-for-kalle-2014-12-30' of https://git.kernel.org/pub/scm/linux...
[cascardo/linux.git] / drivers / coresight / coresight-tpiu.c
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/device.h>
17 #include <linux/io.h>
18 #include <linux/err.h>
19 #include <linux/slab.h>
20 #include <linux/clk.h>
21 #include <linux/coresight.h>
22 #include <linux/amba/bus.h>
23
24 #include "coresight-priv.h"
25
26 #define TPIU_SUPP_PORTSZ        0x000
27 #define TPIU_CURR_PORTSZ        0x004
28 #define TPIU_SUPP_TRIGMODES     0x100
29 #define TPIU_TRIG_CNTRVAL       0x104
30 #define TPIU_TRIG_MULT          0x108
31 #define TPIU_SUPP_TESTPATM      0x200
32 #define TPIU_CURR_TESTPATM      0x204
33 #define TPIU_TEST_PATREPCNTR    0x208
34 #define TPIU_FFSR               0x300
35 #define TPIU_FFCR               0x304
36 #define TPIU_FSYNC_CNTR         0x308
37 #define TPIU_EXTCTL_INPORT      0x400
38 #define TPIU_EXTCTL_OUTPORT     0x404
39 #define TPIU_ITTRFLINACK        0xee4
40 #define TPIU_ITTRFLIN           0xee8
41 #define TPIU_ITATBDATA0         0xeec
42 #define TPIU_ITATBCTR2          0xef0
43 #define TPIU_ITATBCTR1          0xef4
44 #define TPIU_ITATBCTR0          0xef8
45
46 /** register definition **/
47 /* FFCR - 0x304 */
48 #define FFCR_FON_MAN            BIT(6)
49
50 /**
51  * @base:       memory mapped base address for this component.
52  * @dev:        the device entity associated to this component.
53  * @csdev:      component vitals needed by the framework.
54  * @clk:        the clock this component is associated to.
55  */
56 struct tpiu_drvdata {
57         void __iomem            *base;
58         struct device           *dev;
59         struct coresight_device *csdev;
60         struct clk              *clk;
61 };
62
63 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
64 {
65         CS_UNLOCK(drvdata->base);
66
67         /* TODO: fill this up */
68
69         CS_LOCK(drvdata->base);
70 }
71
72 static int tpiu_enable(struct coresight_device *csdev)
73 {
74         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
75         int ret;
76
77         ret = clk_prepare_enable(drvdata->clk);
78         if (ret)
79                 return ret;
80
81         tpiu_enable_hw(drvdata);
82
83         dev_info(drvdata->dev, "TPIU enabled\n");
84         return 0;
85 }
86
87 static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
88 {
89         CS_UNLOCK(drvdata->base);
90
91         /* Clear formatter controle reg. */
92         writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
93         /* Generate manual flush */
94         writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
95
96         CS_LOCK(drvdata->base);
97 }
98
99 static void tpiu_disable(struct coresight_device *csdev)
100 {
101         struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
102
103         tpiu_disable_hw(drvdata);
104
105         clk_disable_unprepare(drvdata->clk);
106
107         dev_info(drvdata->dev, "TPIU disabled\n");
108 }
109
110 static const struct coresight_ops_sink tpiu_sink_ops = {
111         .enable         = tpiu_enable,
112         .disable        = tpiu_disable,
113 };
114
115 static const struct coresight_ops tpiu_cs_ops = {
116         .sink_ops       = &tpiu_sink_ops,
117 };
118
119 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
120 {
121         int ret;
122         void __iomem *base;
123         struct device *dev = &adev->dev;
124         struct coresight_platform_data *pdata = NULL;
125         struct tpiu_drvdata *drvdata;
126         struct resource *res = &adev->res;
127         struct coresight_desc *desc;
128         struct device_node *np = adev->dev.of_node;
129
130         if (np) {
131                 pdata = of_get_coresight_platform_data(dev, np);
132                 if (IS_ERR(pdata))
133                         return PTR_ERR(pdata);
134                 adev->dev.platform_data = pdata;
135         }
136
137         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
138         if (!drvdata)
139                 return -ENOMEM;
140
141         drvdata->dev = &adev->dev;
142         dev_set_drvdata(dev, drvdata);
143
144         /* Validity for the resource is already checked by the AMBA core */
145         base = devm_ioremap_resource(dev, res);
146         if (IS_ERR(base))
147                 return PTR_ERR(base);
148
149         drvdata->base = base;
150
151         drvdata->clk = adev->pclk;
152         ret = clk_prepare_enable(drvdata->clk);
153         if (ret)
154                 return ret;
155
156         /* Disable tpiu to support older devices */
157         tpiu_disable_hw(drvdata);
158
159         clk_disable_unprepare(drvdata->clk);
160
161         desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
162         if (!desc)
163                 return -ENOMEM;
164
165         desc->type = CORESIGHT_DEV_TYPE_SINK;
166         desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
167         desc->ops = &tpiu_cs_ops;
168         desc->pdata = pdata;
169         desc->dev = dev;
170         drvdata->csdev = coresight_register(desc);
171         if (IS_ERR(drvdata->csdev))
172                 return PTR_ERR(drvdata->csdev);
173
174         dev_info(dev, "TPIU initialized\n");
175         return 0;
176 }
177
178 static int tpiu_remove(struct amba_device *adev)
179 {
180         struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
181
182         coresight_unregister(drvdata->csdev);
183         return 0;
184 }
185
186 static struct amba_id tpiu_ids[] = {
187         {
188                 .id     = 0x0003b912,
189                 .mask   = 0x0003ffff,
190         },
191         { 0, 0},
192 };
193
194 static struct amba_driver tpiu_driver = {
195         .drv = {
196                 .name   = "coresight-tpiu",
197                 .owner  = THIS_MODULE,
198         },
199         .probe          = tpiu_probe,
200         .remove         = tpiu_remove,
201         .id_table       = tpiu_ids,
202 };
203
204 static int __init tpiu_init(void)
205 {
206         return amba_driver_register(&tpiu_driver);
207 }
208 module_init(tpiu_init);
209
210 static void __exit tpiu_exit(void)
211 {
212         amba_driver_unregister(&tpiu_driver);
213 }
214 module_exit(tpiu_exit);
215
216 MODULE_LICENSE("GPL v2");
217 MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");