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Pratik Pateldc161b92014-11-03 11:07:37 -07001/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
2 *
Paul Gortmaker941943c2016-02-17 17:52:03 -07003 * Description: CoreSight Trace Port Interface Unit driver
4 *
Pratik Pateldc161b92014-11-03 11:07:37 -07005 * 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>
Pratik Pateldc161b92014-11-03 11:07:37 -070016#include <linux/init.h>
17#include <linux/device.h>
18#include <linux/io.h>
19#include <linux/err.h>
20#include <linux/slab.h>
Linus Walleijb5913d642015-05-19 10:55:10 -060021#include <linux/pm_runtime.h>
Pratik Pateldc161b92014-11-03 11:07:37 -070022#include <linux/coresight.h>
23#include <linux/amba/bus.h>
Linus Walleijdb341d32015-05-19 10:55:15 -060024#include <linux/clk.h>
Pratik Pateldc161b92014-11-03 11:07:37 -070025
26#include "coresight-priv.h"
27
28#define TPIU_SUPP_PORTSZ 0x000
29#define TPIU_CURR_PORTSZ 0x004
30#define TPIU_SUPP_TRIGMODES 0x100
31#define TPIU_TRIG_CNTRVAL 0x104
32#define TPIU_TRIG_MULT 0x108
33#define TPIU_SUPP_TESTPATM 0x200
34#define TPIU_CURR_TESTPATM 0x204
35#define TPIU_TEST_PATREPCNTR 0x208
36#define TPIU_FFSR 0x300
37#define TPIU_FFCR 0x304
38#define TPIU_FSYNC_CNTR 0x308
39#define TPIU_EXTCTL_INPORT 0x400
40#define TPIU_EXTCTL_OUTPORT 0x404
41#define TPIU_ITTRFLINACK 0xee4
42#define TPIU_ITTRFLIN 0xee8
43#define TPIU_ITATBDATA0 0xeec
44#define TPIU_ITATBCTR2 0xef0
45#define TPIU_ITATBCTR1 0xef4
46#define TPIU_ITATBCTR0 0xef8
47
48/** register definition **/
49/* FFCR - 0x304 */
50#define FFCR_FON_MAN BIT(6)
51
52/**
53 * @base: memory mapped base address for this component.
54 * @dev: the device entity associated to this component.
Linus Walleijdb341d32015-05-19 10:55:15 -060055 * @atclk: optional clock for the core parts of the TPIU.
Pratik Pateldc161b92014-11-03 11:07:37 -070056 * @csdev: component vitals needed by the framework.
Pratik Pateldc161b92014-11-03 11:07:37 -070057 */
58struct tpiu_drvdata {
59 void __iomem *base;
60 struct device *dev;
Linus Walleijdb341d32015-05-19 10:55:15 -060061 struct clk *atclk;
Pratik Pateldc161b92014-11-03 11:07:37 -070062 struct coresight_device *csdev;
Pratik Pateldc161b92014-11-03 11:07:37 -070063};
64
65static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
66{
67 CS_UNLOCK(drvdata->base);
68
69 /* TODO: fill this up */
70
71 CS_LOCK(drvdata->base);
72}
73
Mathieu Poiriere827d452016-02-17 17:51:59 -070074static int tpiu_enable(struct coresight_device *csdev, u32 mode)
Pratik Pateldc161b92014-11-03 11:07:37 -070075{
76 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
Pratik Pateldc161b92014-11-03 11:07:37 -070077
Pratik Pateldc161b92014-11-03 11:07:37 -070078 tpiu_enable_hw(drvdata);
79
80 dev_info(drvdata->dev, "TPIU enabled\n");
81 return 0;
82}
83
84static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
85{
86 CS_UNLOCK(drvdata->base);
87
88 /* Clear formatter controle reg. */
89 writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
90 /* Generate manual flush */
91 writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
92
93 CS_LOCK(drvdata->base);
94}
95
96static void tpiu_disable(struct coresight_device *csdev)
97{
98 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
99
100 tpiu_disable_hw(drvdata);
Pratik Pateldc161b92014-11-03 11:07:37 -0700101
102 dev_info(drvdata->dev, "TPIU disabled\n");
103}
104
105static const struct coresight_ops_sink tpiu_sink_ops = {
106 .enable = tpiu_enable,
107 .disable = tpiu_disable,
108};
109
110static const struct coresight_ops tpiu_cs_ops = {
111 .sink_ops = &tpiu_sink_ops,
112};
113
114static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
115{
Linus Walleijdb341d32015-05-19 10:55:15 -0600116 int ret;
Pratik Pateldc161b92014-11-03 11:07:37 -0700117 void __iomem *base;
118 struct device *dev = &adev->dev;
119 struct coresight_platform_data *pdata = NULL;
120 struct tpiu_drvdata *drvdata;
121 struct resource *res = &adev->res;
Suzuki K Poulose94862952016-08-25 15:19:05 -0600122 struct coresight_desc desc = { 0 };
Pratik Pateldc161b92014-11-03 11:07:37 -0700123 struct device_node *np = adev->dev.of_node;
124
125 if (np) {
126 pdata = of_get_coresight_platform_data(dev, np);
127 if (IS_ERR(pdata))
128 return PTR_ERR(pdata);
129 adev->dev.platform_data = pdata;
130 }
131
132 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
133 if (!drvdata)
134 return -ENOMEM;
135
136 drvdata->dev = &adev->dev;
Linus Walleijdb341d32015-05-19 10:55:15 -0600137 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
138 if (!IS_ERR(drvdata->atclk)) {
139 ret = clk_prepare_enable(drvdata->atclk);
140 if (ret)
141 return ret;
142 }
Pratik Pateldc161b92014-11-03 11:07:37 -0700143 dev_set_drvdata(dev, drvdata);
144
145 /* Validity for the resource is already checked by the AMBA core */
146 base = devm_ioremap_resource(dev, res);
147 if (IS_ERR(base))
148 return PTR_ERR(base);
149
150 drvdata->base = base;
151
Pratik Pateldc161b92014-11-03 11:07:37 -0700152 /* Disable tpiu to support older devices */
153 tpiu_disable_hw(drvdata);
154
Linus Walleijb5913d642015-05-19 10:55:10 -0600155 pm_runtime_put(&adev->dev);
Pratik Pateldc161b92014-11-03 11:07:37 -0700156
Suzuki K Poulose94862952016-08-25 15:19:05 -0600157 desc.type = CORESIGHT_DEV_TYPE_SINK;
158 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
159 desc.ops = &tpiu_cs_ops;
160 desc.pdata = pdata;
161 desc.dev = dev;
162 drvdata->csdev = coresight_register(&desc);
Pratik Pateldc161b92014-11-03 11:07:37 -0700163 if (IS_ERR(drvdata->csdev))
164 return PTR_ERR(drvdata->csdev);
165
Pratik Pateldc161b92014-11-03 11:07:37 -0700166 return 0;
167}
168
Linus Walleijdb341d32015-05-19 10:55:15 -0600169#ifdef CONFIG_PM
170static int tpiu_runtime_suspend(struct device *dev)
171{
172 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
173
174 if (drvdata && !IS_ERR(drvdata->atclk))
175 clk_disable_unprepare(drvdata->atclk);
176
177 return 0;
178}
179
180static int tpiu_runtime_resume(struct device *dev)
181{
182 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
183
184 if (drvdata && !IS_ERR(drvdata->atclk))
185 clk_prepare_enable(drvdata->atclk);
186
187 return 0;
188}
189#endif
190
191static const struct dev_pm_ops tpiu_dev_pm_ops = {
192 SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
193};
194
Pratik Pateldc161b92014-11-03 11:07:37 -0700195static struct amba_id tpiu_ids[] = {
196 {
197 .id = 0x0003b912,
198 .mask = 0x0003ffff,
199 },
Linus Walleij4339b692015-05-19 10:55:08 -0600200 {
201 .id = 0x0004b912,
202 .mask = 0x0007ffff,
203 },
Pratik Pateldc161b92014-11-03 11:07:37 -0700204 { 0, 0},
205};
206
207static struct amba_driver tpiu_driver = {
208 .drv = {
209 .name = "coresight-tpiu",
210 .owner = THIS_MODULE,
Linus Walleijdb341d32015-05-19 10:55:15 -0600211 .pm = &tpiu_dev_pm_ops,
Mathieu Poirierb15f0fb2016-02-02 14:14:00 -0700212 .suppress_bind_attrs = true,
Pratik Pateldc161b92014-11-03 11:07:37 -0700213 },
214 .probe = tpiu_probe,
Pratik Pateldc161b92014-11-03 11:07:37 -0700215 .id_table = tpiu_ids,
216};
Paul Gortmaker941943c2016-02-17 17:52:03 -0700217builtin_amba_driver(tpiu_driver);