1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
4 *
5 * Description: CoreSight Trace Port Interface Unit driver
6 */
7
8#include <linux/atomic.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/device.h>
12#include <linux/io.h>
13#include <linux/err.h>
14#include <linux/slab.h>
15#include <linux/pm_runtime.h>
16#include <linux/coresight.h>
17#include <linux/amba/bus.h>
18#include <linux/clk.h>
19
20#include "coresight-priv.h"
21
22#define TPIU_SUPP_PORTSZ 0x000
23#define TPIU_CURR_PORTSZ 0x004
24#define TPIU_SUPP_TRIGMODES 0x100
25#define TPIU_TRIG_CNTRVAL 0x104
26#define TPIU_TRIG_MULT 0x108
27#define TPIU_SUPP_TESTPATM 0x200
28#define TPIU_CURR_TESTPATM 0x204
29#define TPIU_TEST_PATREPCNTR 0x208
30#define TPIU_FFSR 0x300
31#define TPIU_FFCR 0x304
32#define TPIU_FSYNC_CNTR 0x308
33#define TPIU_EXTCTL_INPORT 0x400
34#define TPIU_EXTCTL_OUTPORT 0x404
35#define TPIU_ITTRFLINACK 0xee4
36#define TPIU_ITTRFLIN 0xee8
37#define TPIU_ITATBDATA0 0xeec
38#define TPIU_ITATBCTR2 0xef0
39#define TPIU_ITATBCTR1 0xef4
40#define TPIU_ITATBCTR0 0xef8
41
42/** register definition **/
43/* FFSR - 0x300 */
44#define FFSR_FT_STOPPED_BIT 1
45/* FFCR - 0x304 */
46#define FFCR_FON_MAN_BIT 6
47#define FFCR_FON_MAN BIT(6)
48#define FFCR_STOP_FI BIT(12)
49
50DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
51
52/*
53 * @base: memory mapped base address for this component.
54 * @atclk: optional clock for the core parts of the TPIU.
55 * @csdev: component vitals needed by the framework.
56 */
57struct tpiu_drvdata {
58 void __iomem *base;
59 struct clk *atclk;
60 struct coresight_device *csdev;
61 spinlock_t spinlock;
62};
63
64static void tpiu_enable_hw(struct csdev_access *csa)
65{
66 CS_UNLOCK(addr: csa->base);
67
68 /* TODO: fill this up */
69
70 CS_LOCK(addr: csa->base);
71}
72
73static int tpiu_enable(struct coresight_device *csdev, enum cs_mode mode,
74 void *__unused)
75{
76 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev: csdev->dev.parent);
77
78 guard(spinlock)(l: &drvdata->spinlock);
79 tpiu_enable_hw(csa: &csdev->access);
80 csdev->refcnt++;
81 dev_dbg(&csdev->dev, "TPIU enabled\n");
82 return 0;
83}
84
85static void tpiu_disable_hw(struct csdev_access *csa)
86{
87 CS_UNLOCK(addr: csa->base);
88
89 /* Clear formatter and stop on flush */
90 csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
91 /* Generate manual flush */
92 csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
93 /* Wait for flush to complete */
94 coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, value: 0);
95 /* Wait for formatter to stop */
96 coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, value: 1);
97
98 CS_LOCK(addr: csa->base);
99}
100
101static int tpiu_disable(struct coresight_device *csdev)
102{
103 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev: csdev->dev.parent);
104
105 guard(spinlock)(l: &drvdata->spinlock);
106 csdev->refcnt--;
107 if (csdev->refcnt)
108 return -EBUSY;
109
110 tpiu_disable_hw(csa: &csdev->access);
111
112 dev_dbg(&csdev->dev, "TPIU disabled\n");
113 return 0;
114}
115
116static const struct coresight_ops_sink tpiu_sink_ops = {
117 .enable = tpiu_enable,
118 .disable = tpiu_disable,
119};
120
121static const struct coresight_ops tpiu_cs_ops = {
122 .sink_ops = &tpiu_sink_ops,
123};
124
125static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
126{
127 int ret;
128 void __iomem *base;
129 struct device *dev = &adev->dev;
130 struct coresight_platform_data *pdata = NULL;
131 struct tpiu_drvdata *drvdata;
132 struct resource *res = &adev->res;
133 struct coresight_desc desc = { 0 };
134
135 desc.name = coresight_alloc_device_name(devs: &tpiu_devs, dev);
136 if (!desc.name)
137 return -ENOMEM;
138
139 drvdata = devm_kzalloc(dev, size: sizeof(*drvdata), GFP_KERNEL);
140 if (!drvdata)
141 return -ENOMEM;
142
143 spin_lock_init(&drvdata->spinlock);
144
145 drvdata->atclk = devm_clk_get(dev: &adev->dev, id: "atclk"); /* optional */
146 if (!IS_ERR(ptr: drvdata->atclk)) {
147 ret = clk_prepare_enable(clk: drvdata->atclk);
148 if (ret)
149 return ret;
150 }
151 dev_set_drvdata(dev, data: drvdata);
152
153 /* Validity for the resource is already checked by the AMBA core */
154 base = devm_ioremap_resource(dev, res);
155 if (IS_ERR(ptr: base))
156 return PTR_ERR(ptr: base);
157
158 drvdata->base = base;
159 desc.access = CSDEV_ACCESS_IOMEM(base);
160
161 /* Disable tpiu to support older devices */
162 tpiu_disable_hw(csa: &desc.access);
163
164 pdata = coresight_get_platform_data(dev);
165 if (IS_ERR(ptr: pdata))
166 return PTR_ERR(ptr: pdata);
167 dev->platform_data = pdata;
168
169 desc.type = CORESIGHT_DEV_TYPE_SINK;
170 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
171 desc.ops = &tpiu_cs_ops;
172 desc.pdata = pdata;
173 desc.dev = dev;
174 drvdata->csdev = coresight_register(desc: &desc);
175
176 if (!IS_ERR(ptr: drvdata->csdev)) {
177 pm_runtime_put(dev: &adev->dev);
178 return 0;
179 }
180
181 return PTR_ERR(ptr: drvdata->csdev);
182}
183
184static void tpiu_remove(struct amba_device *adev)
185{
186 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev: &adev->dev);
187
188 coresight_unregister(csdev: drvdata->csdev);
189}
190
191#ifdef CONFIG_PM
192static int tpiu_runtime_suspend(struct device *dev)
193{
194 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
195
196 if (drvdata && !IS_ERR(ptr: drvdata->atclk))
197 clk_disable_unprepare(clk: drvdata->atclk);
198
199 return 0;
200}
201
202static int tpiu_runtime_resume(struct device *dev)
203{
204 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
205
206 if (drvdata && !IS_ERR(ptr: drvdata->atclk))
207 clk_prepare_enable(clk: drvdata->atclk);
208
209 return 0;
210}
211#endif
212
213static const struct dev_pm_ops tpiu_dev_pm_ops = {
214 SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
215};
216
217static const struct amba_id tpiu_ids[] = {
218 {
219 .id = 0x000bb912,
220 .mask = 0x000fffff,
221 },
222 {
223 .id = 0x0004b912,
224 .mask = 0x0007ffff,
225 },
226 {
227 /* Coresight SoC-600 */
228 .id = 0x000bb9e7,
229 .mask = 0x000fffff,
230 },
231 { 0, 0, NULL },
232};
233
234MODULE_DEVICE_TABLE(amba, tpiu_ids);
235
236static struct amba_driver tpiu_driver = {
237 .drv = {
238 .name = "coresight-tpiu",
239 .owner = THIS_MODULE,
240 .pm = &tpiu_dev_pm_ops,
241 .suppress_bind_attrs = true,
242 },
243 .probe = tpiu_probe,
244 .remove = tpiu_remove,
245 .id_table = tpiu_ids,
246};
247
248module_amba_driver(tpiu_driver);
249
250MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
251MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
252MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");
253MODULE_LICENSE("GPL v2");
254

source code of linux/drivers/hwtracing/coresight/coresight-tpiu.c