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/acpi.h>
9 #include <linux/amba/bus.h>
10 #include <linux/atomic.h>
11 #include <linux/clk.h>
12 #include <linux/coresight.h>
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/io.h>
17 #include <linux/kernel.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/slab.h>
21
22 #include "coresight-priv.h"
23
24 #define TPIU_SUPP_PORTSZ 0x000
25 #define TPIU_CURR_PORTSZ 0x004
26 #define TPIU_SUPP_TRIGMODES 0x100
27 #define TPIU_TRIG_CNTRVAL 0x104
28 #define TPIU_TRIG_MULT 0x108
29 #define TPIU_SUPP_TESTPATM 0x200
30 #define TPIU_CURR_TESTPATM 0x204
31 #define TPIU_TEST_PATREPCNTR 0x208
32 #define TPIU_FFSR 0x300
33 #define TPIU_FFCR 0x304
34 #define TPIU_FSYNC_CNTR 0x308
35 #define TPIU_EXTCTL_INPORT 0x400
36 #define TPIU_EXTCTL_OUTPORT 0x404
37 #define TPIU_ITTRFLINACK 0xee4
38 #define TPIU_ITTRFLIN 0xee8
39 #define TPIU_ITATBDATA0 0xeec
40 #define TPIU_ITATBCTR2 0xef0
41 #define TPIU_ITATBCTR1 0xef4
42 #define TPIU_ITATBCTR0 0xef8
43
44 /** register definition **/
45 /* FFSR - 0x300 */
46 #define FFSR_FT_STOPPED_BIT 1
47 /* FFCR - 0x304 */
48 #define FFCR_FON_MAN_BIT 6
49 #define FFCR_FON_MAN BIT(6)
50 #define FFCR_STOP_FI BIT(12)
51
52 DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
53
54 /*
55 * @base: memory mapped base address for this component.
56 * @atclk: optional clock for the core parts of the TPIU.
57 * @pclk: APB clock if present, otherwise NULL
58 * @csdev: component vitals needed by the framework.
59 */
60 struct tpiu_drvdata {
61 void __iomem *base;
62 struct clk *atclk;
63 struct clk *pclk;
64 struct coresight_device *csdev;
65 spinlock_t spinlock;
66 };
67
tpiu_enable_hw(struct csdev_access * csa)68 static void tpiu_enable_hw(struct csdev_access *csa)
69 {
70 CS_UNLOCK(csa->base);
71
72 /* TODO: fill this up */
73
74 CS_LOCK(csa->base);
75 }
76
tpiu_enable(struct coresight_device * csdev,enum cs_mode mode,struct coresight_path * path)77 static int tpiu_enable(struct coresight_device *csdev, enum cs_mode mode,
78 struct coresight_path *path)
79 {
80 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
81
82 guard(spinlock)(&drvdata->spinlock);
83 tpiu_enable_hw(&csdev->access);
84 csdev->refcnt++;
85 dev_dbg(&csdev->dev, "TPIU enabled\n");
86 return 0;
87 }
88
tpiu_disable_hw(struct csdev_access * csa)89 static void tpiu_disable_hw(struct csdev_access *csa)
90 {
91 CS_UNLOCK(csa->base);
92
93 /* Clear formatter and stop on flush */
94 csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
95 /* Generate manual flush */
96 csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
97 /* Wait for flush to complete */
98 coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
99 /* Wait for formatter to stop */
100 coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
101
102 CS_LOCK(csa->base);
103 }
104
tpiu_disable(struct coresight_device * csdev)105 static int tpiu_disable(struct coresight_device *csdev)
106 {
107 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
108
109 guard(spinlock)(&drvdata->spinlock);
110 csdev->refcnt--;
111 if (csdev->refcnt)
112 return -EBUSY;
113
114 tpiu_disable_hw(&csdev->access);
115
116 dev_dbg(&csdev->dev, "TPIU disabled\n");
117 return 0;
118 }
119
120 static const struct coresight_ops_sink tpiu_sink_ops = {
121 .enable = tpiu_enable,
122 .disable = tpiu_disable,
123 };
124
125 static const struct coresight_ops tpiu_cs_ops = {
126 .sink_ops = &tpiu_sink_ops,
127 };
128
__tpiu_probe(struct device * dev,struct resource * res)129 static int __tpiu_probe(struct device *dev, struct resource *res)
130 {
131 void __iomem *base;
132 struct coresight_platform_data *pdata = NULL;
133 struct tpiu_drvdata *drvdata;
134 struct coresight_desc desc = { 0 };
135 int ret;
136
137 desc.name = coresight_alloc_device_name(&tpiu_devs, dev);
138 if (!desc.name)
139 return -ENOMEM;
140
141 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
142 if (!drvdata)
143 return -ENOMEM;
144
145 spin_lock_init(&drvdata->spinlock);
146
147 ret = coresight_get_enable_clocks(dev, &drvdata->pclk, &drvdata->atclk);
148 if (ret)
149 return ret;
150
151 dev_set_drvdata(dev, 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(base))
156 return PTR_ERR(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(&desc.access);
163
164 pdata = coresight_get_platform_data(dev);
165 if (IS_ERR(pdata))
166 return PTR_ERR(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);
175
176 if (!IS_ERR(drvdata->csdev))
177 return 0;
178
179 return PTR_ERR(drvdata->csdev);
180 }
181
tpiu_probe(struct amba_device * adev,const struct amba_id * id)182 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
183 {
184 int ret;
185
186 ret = __tpiu_probe(&adev->dev, &adev->res);
187 if (!ret)
188 pm_runtime_put(&adev->dev);
189 return ret;
190 }
191
__tpiu_remove(struct device * dev)192 static void __tpiu_remove(struct device *dev)
193 {
194 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
195
196 coresight_unregister(drvdata->csdev);
197 }
198
tpiu_remove(struct amba_device * adev)199 static void tpiu_remove(struct amba_device *adev)
200 {
201 __tpiu_remove(&adev->dev);
202 }
203
204 #ifdef CONFIG_PM
tpiu_runtime_suspend(struct device * dev)205 static int tpiu_runtime_suspend(struct device *dev)
206 {
207 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
208
209 clk_disable_unprepare(drvdata->atclk);
210 clk_disable_unprepare(drvdata->pclk);
211
212 return 0;
213 }
214
tpiu_runtime_resume(struct device * dev)215 static int tpiu_runtime_resume(struct device *dev)
216 {
217 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
218 int ret;
219
220 ret = clk_prepare_enable(drvdata->pclk);
221 if (ret)
222 return ret;
223
224 ret = clk_prepare_enable(drvdata->atclk);
225 if (ret)
226 clk_disable_unprepare(drvdata->pclk);
227
228 return ret;
229 }
230 #endif
231
232 static const struct dev_pm_ops tpiu_dev_pm_ops = {
233 SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
234 };
235
236 static const struct amba_id tpiu_ids[] = {
237 {
238 .id = 0x000bb912,
239 .mask = 0x000fffff,
240 },
241 {
242 .id = 0x0004b912,
243 .mask = 0x0007ffff,
244 },
245 {
246 /* Coresight SoC-600 */
247 .id = 0x000bb9e7,
248 .mask = 0x000fffff,
249 },
250 { 0, 0, NULL },
251 };
252
253 MODULE_DEVICE_TABLE(amba, tpiu_ids);
254
255 static struct amba_driver tpiu_driver = {
256 .drv = {
257 .name = "coresight-tpiu",
258 .pm = &tpiu_dev_pm_ops,
259 .suppress_bind_attrs = true,
260 },
261 .probe = tpiu_probe,
262 .remove = tpiu_remove,
263 .id_table = tpiu_ids,
264 };
265
tpiu_platform_probe(struct platform_device * pdev)266 static int tpiu_platform_probe(struct platform_device *pdev)
267 {
268 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
269 int ret;
270
271 pm_runtime_get_noresume(&pdev->dev);
272 pm_runtime_set_active(&pdev->dev);
273 pm_runtime_enable(&pdev->dev);
274
275 ret = __tpiu_probe(&pdev->dev, res);
276 pm_runtime_put(&pdev->dev);
277 if (ret)
278 pm_runtime_disable(&pdev->dev);
279
280 return ret;
281 }
282
tpiu_platform_remove(struct platform_device * pdev)283 static void tpiu_platform_remove(struct platform_device *pdev)
284 {
285 struct tpiu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
286
287 if (WARN_ON(!drvdata))
288 return;
289
290 __tpiu_remove(&pdev->dev);
291 pm_runtime_disable(&pdev->dev);
292 }
293
294 #ifdef CONFIG_ACPI
295 static const struct acpi_device_id tpiu_acpi_ids[] = {
296 {"ARMHC979", 0, 0, 0}, /* ARM CoreSight TPIU */
297 {}
298 };
299 MODULE_DEVICE_TABLE(acpi, tpiu_acpi_ids);
300 #endif
301
302 static struct platform_driver tpiu_platform_driver = {
303 .probe = tpiu_platform_probe,
304 .remove = tpiu_platform_remove,
305 .driver = {
306 .name = "coresight-tpiu-platform",
307 .acpi_match_table = ACPI_PTR(tpiu_acpi_ids),
308 .suppress_bind_attrs = true,
309 .pm = &tpiu_dev_pm_ops,
310 },
311 };
312
tpiu_init(void)313 static int __init tpiu_init(void)
314 {
315 return coresight_init_driver("tpiu", &tpiu_driver, &tpiu_platform_driver, THIS_MODULE);
316 }
317
tpiu_exit(void)318 static void __exit tpiu_exit(void)
319 {
320 coresight_remove_driver(&tpiu_driver, &tpiu_platform_driver);
321 }
322 module_init(tpiu_init);
323 module_exit(tpiu_exit);
324
325 MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
326 MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
327 MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");
328 MODULE_LICENSE("GPL v2");
329