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dc161b9f PP |
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 | ||
3ff7ca05 | 204 | module_amba_driver(tpiu_driver); |
dc161b9f PP |
205 | |
206 | MODULE_LICENSE("GPL v2"); | |
207 | MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver"); |