1 /*
2 * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/amba/bus.h>
15 #include <linux/clk.h>
16 #include <linux/coresight.h>
17 #include <linux/device.h>
18 #include <linux/err.h>
19 #include <linux/init.h>
20 #include <linux/io.h>
21 #include <linux/kernel.h>
22 #include <linux/of.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/slab.h>
25
26 #include "coresight-priv.h"
27
28 #define REPLICATOR_IDFILTER0 0x000
29 #define REPLICATOR_IDFILTER1 0x004
30
31 /**
32 * struct replicator_state - specifics associated to a replicator component
33 * @base: memory mapped base address for this component.
34 * @dev: the device entity associated with this component
35 * @atclk: optional clock for the core parts of the replicator.
36 * @csdev: component vitals needed by the framework
37 */
38 struct replicator_state {
39 void __iomem *base;
40 struct device *dev;
41 struct clk *atclk;
42 struct coresight_device *csdev;
43 };
44
replicator_enable(struct coresight_device * csdev,int inport,int outport)45 static int replicator_enable(struct coresight_device *csdev, int inport,
46 int outport)
47 {
48 struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
49
50 CS_UNLOCK(drvdata->base);
51
52 /*
53 * Ensure that the other port is disabled
54 * 0x00 - passing through the replicator unimpeded
55 * 0xff - disable (or impede) the flow of ATB data
56 */
57 if (outport == 0) {
58 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
59 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
60 } else {
61 writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
62 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
63 }
64
65 CS_LOCK(drvdata->base);
66
67 dev_info(drvdata->dev, "REPLICATOR enabled\n");
68 return 0;
69 }
70
replicator_disable(struct coresight_device * csdev,int inport,int outport)71 static void replicator_disable(struct coresight_device *csdev, int inport,
72 int outport)
73 {
74 struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
75
76 CS_UNLOCK(drvdata->base);
77
78 /* disable the flow of ATB data through port */
79 if (outport == 0)
80 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
81 else
82 writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
83
84 CS_LOCK(drvdata->base);
85
86 dev_info(drvdata->dev, "REPLICATOR disabled\n");
87 }
88
89 static const struct coresight_ops_link replicator_link_ops = {
90 .enable = replicator_enable,
91 .disable = replicator_disable,
92 };
93
94 static const struct coresight_ops replicator_cs_ops = {
95 .link_ops = &replicator_link_ops,
96 };
97
replicator_probe(struct amba_device * adev,const struct amba_id * id)98 static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
99 {
100 int ret;
101 struct device *dev = &adev->dev;
102 struct resource *res = &adev->res;
103 struct coresight_platform_data *pdata = NULL;
104 struct replicator_state *drvdata;
105 struct coresight_desc desc = { 0 };
106 struct device_node *np = adev->dev.of_node;
107 void __iomem *base;
108
109 if (np) {
110 pdata = of_get_coresight_platform_data(dev, np);
111 if (IS_ERR(pdata))
112 return PTR_ERR(pdata);
113 adev->dev.platform_data = pdata;
114 }
115
116 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
117 if (!drvdata)
118 return -ENOMEM;
119
120 drvdata->dev = &adev->dev;
121 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
122 if (!IS_ERR(drvdata->atclk)) {
123 ret = clk_prepare_enable(drvdata->atclk);
124 if (ret)
125 return ret;
126 }
127
128 /* Validity for the resource is already checked by the AMBA core */
129 base = devm_ioremap_resource(dev, res);
130 if (IS_ERR(base))
131 return PTR_ERR(base);
132
133 drvdata->base = base;
134 dev_set_drvdata(dev, drvdata);
135 pm_runtime_put(&adev->dev);
136
137 desc.type = CORESIGHT_DEV_TYPE_LINK;
138 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
139 desc.ops = &replicator_cs_ops;
140 desc.pdata = adev->dev.platform_data;
141 desc.dev = &adev->dev;
142 drvdata->csdev = coresight_register(&desc);
143 if (IS_ERR(drvdata->csdev))
144 return PTR_ERR(drvdata->csdev);
145
146 dev_info(dev, "%s initialized\n", (char *)id->data);
147 return 0;
148 }
149
150 #ifdef CONFIG_PM
replicator_runtime_suspend(struct device * dev)151 static int replicator_runtime_suspend(struct device *dev)
152 {
153 struct replicator_state *drvdata = dev_get_drvdata(dev);
154
155 if (drvdata && !IS_ERR(drvdata->atclk))
156 clk_disable_unprepare(drvdata->atclk);
157
158 return 0;
159 }
160
replicator_runtime_resume(struct device * dev)161 static int replicator_runtime_resume(struct device *dev)
162 {
163 struct replicator_state *drvdata = dev_get_drvdata(dev);
164
165 if (drvdata && !IS_ERR(drvdata->atclk))
166 clk_prepare_enable(drvdata->atclk);
167
168 return 0;
169 }
170 #endif
171
172 static const struct dev_pm_ops replicator_dev_pm_ops = {
173 SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
174 replicator_runtime_resume,
175 NULL)
176 };
177
178 static struct amba_id replicator_ids[] = {
179 {
180 .id = 0x0003b909,
181 .mask = 0x0003ffff,
182 .data = "REPLICATOR 1.0",
183 },
184 { 0, 0 },
185 };
186
187 static struct amba_driver replicator_driver = {
188 .drv = {
189 .name = "coresight-replicator-qcom",
190 .pm = &replicator_dev_pm_ops,
191 .suppress_bind_attrs = true,
192 },
193 .probe = replicator_probe,
194 .id_table = replicator_ids,
195 };
196 builtin_amba_driver(replicator_driver);
197