summaryrefslogtreecommitdiffstats
path: root/drivers/hwtracing/coresight/coresight-tmc.c
blob: 9e02ac963cd0e3fbb38f9ee5e3fd082719f38bf7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
 *
 * Description: CoreSight Trace Memory Controller driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>

#include "coresight-priv.h"
#include "coresight-tmc.h"

void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
{
	/* Ensure formatter, unformatter and hardware fifo are empty */
	if (coresight_timeout(drvdata->base,
			      TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
		dev_err(drvdata->dev,
			"timeout observed when probing at offset %#x\n",
			TMC_STS);
	}
}

void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
{
	u32 ffcr;

	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
	ffcr |= TMC_FFCR_STOP_ON_FLUSH;
	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
	ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
	/* Ensure flush completes */
	if (coresight_timeout(drvdata->base,
			      TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
		dev_err(drvdata->dev,
			"timeout observed when probing at offset %#x\n",
			TMC_FFCR);
	}

	tmc_wait_for_tmcready(drvdata);
}

void tmc_enable_hw(struct tmc_drvdata *drvdata)
{
	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
}

void tmc_disable_hw(struct tmc_drvdata *drvdata)
{
	writel_relaxed(0x0, drvdata->base + TMC_CTL);
}

static int tmc_read_prepare(struct tmc_drvdata *drvdata)
{
	int ret = 0;

	switch (drvdata->config_type) {
	case TMC_CONFIG_TYPE_ETB:
	case TMC_CONFIG_TYPE_ETF:
		ret = tmc_read_prepare_etb(drvdata);
		break;
	case TMC_CONFIG_TYPE_ETR:
		ret = tmc_read_prepare_etr(drvdata);
		break;
	default:
		ret = -EINVAL;
	}

	if (!ret)
		dev_info(drvdata->dev, "TMC read start\n");

	return ret;
}

static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
{
	int ret = 0;

	switch (drvdata->config_type) {
	case TMC_CONFIG_TYPE_ETB:
	case TMC_CONFIG_TYPE_ETF:
		ret = tmc_read_unprepare_etb(drvdata);
		break;
	case TMC_CONFIG_TYPE_ETR:
		ret = tmc_read_unprepare_etr(drvdata);
		break;
	default:
		ret = -EINVAL;
	}

	if (!ret)
		dev_info(drvdata->dev, "TMC read end\n");

	return ret;
}

static int tmc_open(struct inode *inode, struct file *file)
{
	int ret;
	struct tmc_drvdata *drvdata = container_of(file->private_data,
						   struct tmc_drvdata, miscdev);

	ret = tmc_read_prepare(drvdata);
	if (ret)
		return ret;

	nonseekable_open(inode, file);

	dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
	return 0;
}

static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
			loff_t *ppos)
{
	struct tmc_drvdata *drvdata = container_of(file->private_data,
						   struct tmc_drvdata, miscdev);
	char *bufp = drvdata->buf + *ppos;

	if (*ppos + len > drvdata->size)
		len = drvdata->size - *ppos;

	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
		if (bufp == (char *)(drvdata->vaddr + drvdata->size))
			bufp = drvdata->vaddr;
		else if (bufp > (char *)(drvdata->vaddr + drvdata->size))
			bufp -= drvdata->size;
		if ((bufp + len) > (char *)(drvdata->vaddr + drvdata->size))
			len = (char *)(drvdata->vaddr + drvdata->size) - bufp;
	}

	if (copy_to_user(data, bufp, len)) {
		dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
		return -EFAULT;
	}

	*ppos += len;

	dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
		__func__, len, (int)(drvdata->size - *ppos));
	return len;
}

static int tmc_release(struct inode *inode, struct file *file)
{
	int ret;
	struct tmc_drvdata *drvdata = container_of(file->private_data,
						   struct tmc_drvdata, miscdev);

	ret = tmc_read_unprepare(drvdata);
	if (ret)
		return ret;

	dev_dbg(drvdata->dev, "%s: released\n", __func__);
	return 0;
}

static const struct file_operations tmc_fops = {
	.owner		= THIS_MODULE,
	.open		= tmc_open,
	.read		= tmc_read,
	.release	= tmc_release,
	.llseek		= no_llseek,
};

static enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
{
	enum tmc_mem_intf_width memwidth;

	/*
	 * Excerpt from the TRM:
	 *
	 * DEVID::MEMWIDTH[10:8]
	 * 0x2 Memory interface databus is 32 bits wide.
	 * 0x3 Memory interface databus is 64 bits wide.
	 * 0x4 Memory interface databus is 128 bits wide.
	 * 0x5 Memory interface databus is 256 bits wide.
	 */
	switch (BMVAL(devid, 8, 10)) {
	case 0x2:
		memwidth = TMC_MEM_INTF_WIDTH_32BITS;
		break;
	case 0x3:
		memwidth = TMC_MEM_INTF_WIDTH_64BITS;
		break;
	case 0x4:
		memwidth = TMC_MEM_INTF_WIDTH_128BITS;
		break;
	case 0x5:
		memwidth = TMC_MEM_INTF_WIDTH_256BITS;
		break;
	default:
		memwidth = 0;
	}

	return memwidth;
}

#define coresight_tmc_simple_func(name, offset)			\
	coresight_simple_func(struct tmc_drvdata, name, offset)

coresight_tmc_simple_func(rsz, TMC_RSZ);
coresight_tmc_simple_func(sts, TMC_STS);
coresight_tmc_simple_func(rrp, TMC_RRP);
coresight_tmc_simple_func(rwp, TMC_RWP);
coresight_tmc_simple_func(trg, TMC_TRG);
coresight_tmc_simple_func(ctl, TMC_CTL);
coresight_tmc_simple_func(ffsr, TMC_FFSR);
coresight_tmc_simple_func(ffcr, TMC_FFCR);
coresight_tmc_simple_func(mode, TMC_MODE);
coresight_tmc_simple_func(pscr, TMC_PSCR);
coresight_tmc_simple_func(devid, CORESIGHT_DEVID);

static struct attribute *coresight_tmc_mgmt_attrs[] = {
	&dev_attr_rsz.attr,
	&dev_attr_sts.attr,
	&dev_attr_rrp.attr,
	&dev_attr_rwp.attr,
	&dev_attr_trg.attr,
	&dev_attr_ctl.attr,
	&dev_attr_ffsr.attr,
	&dev_attr_ffcr.attr,
	&dev_attr_mode.attr,
	&dev_attr_pscr.attr,
	&dev_attr_devid.attr,
	NULL,
};

ssize_t trigger_cntr_show(struct device *dev,
			  struct device_attribute *attr, char *buf)
{
	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	unsigned long val = drvdata->trigger_cntr;

	return sprintf(buf, "%#lx\n", val);
}

static ssize_t trigger_cntr_store(struct device *dev,
			     struct device_attribute *attr,
			     const char *buf, size_t size)
{
	int ret;
	unsigned long val;
	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

	ret = kstrtoul(buf, 16, &val);
	if (ret)
		return ret;

	drvdata->trigger_cntr = val;
	return size;
}
static DEVICE_ATTR_RW(trigger_cntr);

static struct attribute *coresight_tmc_attrs[] = {
	&dev_attr_trigger_cntr.attr,
	NULL,
};

static const struct attribute_group coresight_tmc_group = {
	.attrs = coresight_tmc_attrs,
};

static const struct attribute_group coresight_tmc_mgmt_group = {
	.attrs = coresight_tmc_mgmt_attrs,
	.name = "mgmt",
};

const struct attribute_group *coresight_tmc_groups[] = {
	&coresight_tmc_group,
	&coresight_tmc_mgmt_group,
	NULL,
};

static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
{
	int ret = 0;
	u32 devid;
	void __iomem *base;
	struct device *dev = &adev->dev;
	struct coresight_platform_data *pdata = NULL;
	struct tmc_drvdata *drvdata;
	struct resource *res = &adev->res;
	struct coresight_desc *desc;
	struct device_node *np = adev->dev.of_node;

	if (np) {
		pdata = of_get_coresight_platform_data(dev, np);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
		adev->dev.platform_data = pdata;
	}

	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
		return -ENOMEM;

	drvdata->dev = &adev->dev;
	dev_set_drvdata(dev, drvdata);

	/* Validity for the resource is already checked by the AMBA core */
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	drvdata->base = base;

	spin_lock_init(&drvdata->spinlock);

	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
	drvdata->config_type = BMVAL(devid, 6, 7);
	drvdata->memwidth = tmc_get_memwidth(devid);

	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
		if (np)
			ret = of_property_read_u32(np,
						   "arm,buffer-size",
						   &drvdata->size);
		if (ret)
			drvdata->size = SZ_1M;
	} else {
		drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
	}

	pm_runtime_put(&adev->dev);

	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
	if (!desc) {
		ret = -ENOMEM;
		goto err_devm_kzalloc;
	}

	desc->pdata = pdata;
	desc->dev = dev;
	desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
	desc->groups = coresight_tmc_groups;

	if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
		desc->type = CORESIGHT_DEV_TYPE_SINK;
		desc->ops = &tmc_etb_cs_ops;
	} else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
		desc->type = CORESIGHT_DEV_TYPE_SINK;
		desc->ops = &tmc_etr_cs_ops;
	} else {
		desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
		desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
		desc->ops = &tmc_etf_cs_ops;
	}

	drvdata->csdev = coresight_register(desc);
	if (IS_ERR(drvdata->csdev)) {
		ret = PTR_ERR(drvdata->csdev);
		goto err_devm_kzalloc;
	}

	drvdata->miscdev.name = pdata->name;
	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
	drvdata->miscdev.fops = &tmc_fops;
	ret = misc_register(&drvdata->miscdev);
	if (ret)
		goto err_misc_register;

	return 0;

err_misc_register:
	coresight_unregister(drvdata->csdev);
err_devm_kzalloc:
	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
		dma_free_coherent(dev, drvdata->size,
				drvdata->vaddr, drvdata->paddr);
	return ret;
}

static struct amba_id tmc_ids[] = {
	{
		.id     = 0x0003b961,
		.mask   = 0x0003ffff,
	},
	{ 0, 0},
};

static struct amba_driver tmc_driver = {
	.drv = {
		.name   = "coresight-tmc",
		.owner  = THIS_MODULE,
		.suppress_bind_attrs = true,
	},
	.probe		= tmc_probe,
	.id_table	= tmc_ids,
};
builtin_amba_driver(tmc_driver);