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mpls_iptunnel: fix sparse warn: remove incorrect rcu_dereference
[linux/fpc-iii.git] / drivers / hwtracing / coresight / coresight-tmc.c
bloba57c7ec1661f915f9d7bc680cefc3558129d299a
1 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/types.h>
17 #include <linux/device.h>
18 #include <linux/io.h>
19 #include <linux/err.h>
20 #include <linux/fs.h>
21 #include <linux/miscdevice.h>
22 #include <linux/uaccess.h>
23 #include <linux/slab.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/spinlock.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of.h>
28 #include <linux/coresight.h>
29 #include <linux/amba/bus.h>
30
31 #include "coresight-priv.h"
32
33 #define TMC_RSZ 0x004
34 #define TMC_STS 0x00c
35 #define TMC_RRD 0x010
36 #define TMC_RRP 0x014
37 #define TMC_RWP 0x018
38 #define TMC_TRG 0x01c
39 #define TMC_CTL 0x020
40 #define TMC_RWD 0x024
41 #define TMC_MODE 0x028
42 #define TMC_LBUFLEVEL 0x02c
43 #define TMC_CBUFLEVEL 0x030
44 #define TMC_BUFWM 0x034
45 #define TMC_RRPHI 0x038
46 #define TMC_RWPHI 0x03c
47 #define TMC_AXICTL 0x110
48 #define TMC_DBALO 0x118
49 #define TMC_DBAHI 0x11c
50 #define TMC_FFSR 0x300
51 #define TMC_FFCR 0x304
52 #define TMC_PSCR 0x308
53 #define TMC_ITMISCOP0 0xee0
54 #define TMC_ITTRFLIN 0xee8
55 #define TMC_ITATBDATA0 0xeec
56 #define TMC_ITATBCTR2 0xef0
57 #define TMC_ITATBCTR1 0xef4
58 #define TMC_ITATBCTR0 0xef8
59
60 /* register description */
61 /* TMC_CTL - 0x020 */
62 #define TMC_CTL_CAPT_EN BIT(0)
63 /* TMC_STS - 0x00C */
64 #define TMC_STS_TRIGGERED BIT(1)
65 /* TMC_AXICTL - 0x110 */
66 #define TMC_AXICTL_PROT_CTL_B0 BIT(0)
67 #define TMC_AXICTL_PROT_CTL_B1 BIT(1)
68 #define TMC_AXICTL_SCT_GAT_MODE BIT(7)
69 #define TMC_AXICTL_WR_BURST_LEN 0xF00
70 /* TMC_FFCR - 0x304 */
71 #define TMC_FFCR_EN_FMT BIT(0)
72 #define TMC_FFCR_EN_TI BIT(1)
73 #define TMC_FFCR_FON_FLIN BIT(4)
74 #define TMC_FFCR_FON_TRIG_EVT BIT(5)
75 #define TMC_FFCR_FLUSHMAN BIT(6)
76 #define TMC_FFCR_TRIGON_TRIGIN BIT(8)
77 #define TMC_FFCR_STOP_ON_FLUSH BIT(12)
78
79 #define TMC_STS_TRIGGERED_BIT 2
80 #define TMC_FFCR_FLUSHMAN_BIT 6
81
82 enum tmc_config_type {
83 TMC_CONFIG_TYPE_ETB,
84 TMC_CONFIG_TYPE_ETR,
85 TMC_CONFIG_TYPE_ETF,
86 };
87
88 enum tmc_mode {
89 TMC_MODE_CIRCULAR_BUFFER,
90 TMC_MODE_SOFTWARE_FIFO,
91 TMC_MODE_HARDWARE_FIFO,
92 };
93
94 enum tmc_mem_intf_width {
95 TMC_MEM_INTF_WIDTH_32BITS = 0x2,
96 TMC_MEM_INTF_WIDTH_64BITS = 0x3,
97 TMC_MEM_INTF_WIDTH_128BITS = 0x4,
98 TMC_MEM_INTF_WIDTH_256BITS = 0x5,
99 };
100
101 /**
102 * struct tmc_drvdata - specifics associated to an TMC component
103 * @base: memory mapped base address for this component.
104 * @dev: the device entity associated to this component.
105 * @csdev: component vitals needed by the framework.
106 * @miscdev: specifics to handle "/dev/xyz.tmc" entry.
107 * @spinlock: only one at a time pls.
108 * @read_count: manages preparation of buffer for reading.
109 * @buf: area of memory where trace data get sent.
110 * @paddr: DMA start location in RAM.
111 * @vaddr: virtual representation of @paddr.
112 * @size: @buf size.
113 * @enable: this TMC is being used.
114 * @config_type: TMC variant, must be of type @tmc_config_type.
115 * @trigger_cntr: amount of words to store after a trigger.
116 */
117 struct tmc_drvdata {
118 void __iomem *base;
119 struct device *dev;
120 struct coresight_device *csdev;
121 struct miscdevice miscdev;
122 spinlock_t spinlock;
123 int read_count;
124 bool reading;
125 char *buf;
126 dma_addr_t paddr;
127 void __iomem *vaddr;
128 u32 size;
129 bool enable;
130 enum tmc_config_type config_type;
131 u32 trigger_cntr;
132 };
133
134 static void tmc_wait_for_ready(struct tmc_drvdata *drvdata)
135 {
136 /* Ensure formatter, unformatter and hardware fifo are empty */
137 if (coresight_timeout(drvdata->base,
138 TMC_STS, TMC_STS_TRIGGERED_BIT, 1)) {
139 dev_err(drvdata->dev,
140 "timeout observed when probing at offset %#x\n",
141 TMC_STS);
142 }
143 }
144
145 static void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
146 {
147 u32 ffcr;
148
149 ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
150 ffcr |= TMC_FFCR_STOP_ON_FLUSH;
151 writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
152 ffcr |= TMC_FFCR_FLUSHMAN;
153 writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
154 /* Ensure flush completes */
155 if (coresight_timeout(drvdata->base,
156 TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
157 dev_err(drvdata->dev,
158 "timeout observed when probing at offset %#x\n",
159 TMC_FFCR);
160 }
161
162 tmc_wait_for_ready(drvdata);
163 }
164
165 static void tmc_enable_hw(struct tmc_drvdata *drvdata)
166 {
167 writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
168 }
169
170 static void tmc_disable_hw(struct tmc_drvdata *drvdata)
171 {
172 writel_relaxed(0x0, drvdata->base + TMC_CTL);
173 }
174
175 static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
176 {
177 /* Zero out the memory to help with debug */
178 memset(drvdata->buf, 0, drvdata->size);
179
180 CS_UNLOCK(drvdata->base);
181
182 writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
183 writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
184 TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
185 TMC_FFCR_TRIGON_TRIGIN,
186 drvdata->base + TMC_FFCR);
187
188 writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
189 tmc_enable_hw(drvdata);
190
191 CS_LOCK(drvdata->base);
192 }
193
194 static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
195 {
196 u32 axictl;
197
198 /* Zero out the memory to help with debug */
199 memset(drvdata->vaddr, 0, drvdata->size);
200
201 CS_UNLOCK(drvdata->base);
202
203 writel_relaxed(drvdata->size / 4, drvdata->base + TMC_RSZ);
204 writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
205
206 axictl = readl_relaxed(drvdata->base + TMC_AXICTL);
207 axictl |= TMC_AXICTL_WR_BURST_LEN;
208 writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
209 axictl &= ~TMC_AXICTL_SCT_GAT_MODE;
210 writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
211 axictl = (axictl &
212 ~(TMC_AXICTL_PROT_CTL_B0 | TMC_AXICTL_PROT_CTL_B1)) |
213 TMC_AXICTL_PROT_CTL_B1;
214 writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
215
216 writel_relaxed(drvdata->paddr, drvdata->base + TMC_DBALO);
217 writel_relaxed(0x0, drvdata->base + TMC_DBAHI);
218 writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
219 TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
220 TMC_FFCR_TRIGON_TRIGIN,
221 drvdata->base + TMC_FFCR);
222 writel_relaxed(drvdata->trigger_cntr, drvdata->base + TMC_TRG);
223 tmc_enable_hw(drvdata);
224
225 CS_LOCK(drvdata->base);
226 }
227
228 static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
229 {
230 CS_UNLOCK(drvdata->base);
231
232 writel_relaxed(TMC_MODE_HARDWARE_FIFO, drvdata->base + TMC_MODE);
233 writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI,
234 drvdata->base + TMC_FFCR);
235 writel_relaxed(0x0, drvdata->base + TMC_BUFWM);
236 tmc_enable_hw(drvdata);
237
238 CS_LOCK(drvdata->base);
239 }
240
241 static int tmc_enable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
242 {
243 unsigned long flags;
244
245 pm_runtime_get_sync(drvdata->dev);
246
247 spin_lock_irqsave(&drvdata->spinlock, flags);
248 if (drvdata->reading) {
249 spin_unlock_irqrestore(&drvdata->spinlock, flags);
250 pm_runtime_put(drvdata->dev);
251 return -EBUSY;
252 }
253
254 if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
255 tmc_etb_enable_hw(drvdata);
256 } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
257 tmc_etr_enable_hw(drvdata);
258 } else {
259 if (mode == TMC_MODE_CIRCULAR_BUFFER)
260 tmc_etb_enable_hw(drvdata);
261 else
262 tmc_etf_enable_hw(drvdata);
263 }
264 drvdata->enable = true;
265 spin_unlock_irqrestore(&drvdata->spinlock, flags);
266
267 dev_info(drvdata->dev, "TMC enabled\n");
268 return 0;
269 }
270
271 static int tmc_enable_sink(struct coresight_device *csdev)
272 {
273 struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
274
275 return tmc_enable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
276 }
277
278 static int tmc_enable_link(struct coresight_device *csdev, int inport,
279 int outport)
280 {
281 struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
282
283 return tmc_enable(drvdata, TMC_MODE_HARDWARE_FIFO);
284 }
285
286 static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
287 {
288 enum tmc_mem_intf_width memwidth;
289 u8 memwords;
290 char *bufp;
291 u32 read_data;
292 int i;
293
294 memwidth = BMVAL(readl_relaxed(drvdata->base + CORESIGHT_DEVID), 8, 10);
295 if (memwidth == TMC_MEM_INTF_WIDTH_32BITS)
296 memwords = 1;
297 else if (memwidth == TMC_MEM_INTF_WIDTH_64BITS)
298 memwords = 2;
299 else if (memwidth == TMC_MEM_INTF_WIDTH_128BITS)
300 memwords = 4;
301 else
302 memwords = 8;
303
304 bufp = drvdata->buf;
305 while (1) {
306 for (i = 0; i < memwords; i++) {
307 read_data = readl_relaxed(drvdata->base + TMC_RRD);
308 if (read_data == 0xFFFFFFFF)
309 return;
310 memcpy(bufp, &read_data, 4);
311 bufp += 4;
312 }
313 }
314 }
315
316 static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
317 {
318 CS_UNLOCK(drvdata->base);
319
320 tmc_flush_and_stop(drvdata);
321 tmc_etb_dump_hw(drvdata);
322 tmc_disable_hw(drvdata);
323
324 CS_LOCK(drvdata->base);
325 }
326
327 static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
328 {
329 u32 rwp, val;
330
331 rwp = readl_relaxed(drvdata->base + TMC_RWP);
332 val = readl_relaxed(drvdata->base + TMC_STS);
333
334 /* How much memory do we still have */
335 if (val & BIT(0))
336 drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
337 else
338 drvdata->buf = drvdata->vaddr;
339 }
340
341 static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
342 {
343 CS_UNLOCK(drvdata->base);
344
345 tmc_flush_and_stop(drvdata);
346 tmc_etr_dump_hw(drvdata);
347 tmc_disable_hw(drvdata);
348
349 CS_LOCK(drvdata->base);
350 }
351
352 static void tmc_etf_disable_hw(struct tmc_drvdata *drvdata)
353 {
354 CS_UNLOCK(drvdata->base);
355
356 tmc_flush_and_stop(drvdata);
357 tmc_disable_hw(drvdata);
358
359 CS_LOCK(drvdata->base);
360 }
361
362 static void tmc_disable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
363 {
364 unsigned long flags;
365
366 spin_lock_irqsave(&drvdata->spinlock, flags);
367 if (drvdata->reading)
368 goto out;
369
370 if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
371 tmc_etb_disable_hw(drvdata);
372 } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
373 tmc_etr_disable_hw(drvdata);
374 } else {
375 if (mode == TMC_MODE_CIRCULAR_BUFFER)
376 tmc_etb_disable_hw(drvdata);
377 else
378 tmc_etf_disable_hw(drvdata);
379 }
380 out:
381 drvdata->enable = false;
382 spin_unlock_irqrestore(&drvdata->spinlock, flags);
383
384 pm_runtime_put(drvdata->dev);
385
386 dev_info(drvdata->dev, "TMC disabled\n");
387 }
388
389 static void tmc_disable_sink(struct coresight_device *csdev)
390 {
391 struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
392
393 tmc_disable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
394 }
395
396 static void tmc_disable_link(struct coresight_device *csdev, int inport,
397 int outport)
398 {
399 struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
400
401 tmc_disable(drvdata, TMC_MODE_HARDWARE_FIFO);
402 }
403
404 static const struct coresight_ops_sink tmc_sink_ops = {
405 .enable = tmc_enable_sink,
406 .disable = tmc_disable_sink,
407 };
408
409 static const struct coresight_ops_link tmc_link_ops = {
410 .enable = tmc_enable_link,
411 .disable = tmc_disable_link,
412 };
413
414 static const struct coresight_ops tmc_etb_cs_ops = {
415 .sink_ops = &tmc_sink_ops,
416 };
417
418 static const struct coresight_ops tmc_etr_cs_ops = {
419 .sink_ops = &tmc_sink_ops,
420 };
421
422 static const struct coresight_ops tmc_etf_cs_ops = {
423 .sink_ops = &tmc_sink_ops,
424 .link_ops = &tmc_link_ops,
425 };
426
427 static int tmc_read_prepare(struct tmc_drvdata *drvdata)
428 {
429 int ret;
430 unsigned long flags;
431 enum tmc_mode mode;
432
433 spin_lock_irqsave(&drvdata->spinlock, flags);
434 if (!drvdata->enable)
435 goto out;
436
437 if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
438 tmc_etb_disable_hw(drvdata);
439 } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
440 tmc_etr_disable_hw(drvdata);
441 } else {
442 mode = readl_relaxed(drvdata->base + TMC_MODE);
443 if (mode == TMC_MODE_CIRCULAR_BUFFER) {
444 tmc_etb_disable_hw(drvdata);
445 } else {
446 ret = -ENODEV;
447 goto err;
448 }
449 }
450 out:
451 drvdata->reading = true;
452 spin_unlock_irqrestore(&drvdata->spinlock, flags);
453
454 dev_info(drvdata->dev, "TMC read start\n");
455 return 0;
456 err:
457 spin_unlock_irqrestore(&drvdata->spinlock, flags);
458 return ret;
459 }
460
461 static void tmc_read_unprepare(struct tmc_drvdata *drvdata)
462 {
463 unsigned long flags;
464 enum tmc_mode mode;
465
466 spin_lock_irqsave(&drvdata->spinlock, flags);
467 if (!drvdata->enable)
468 goto out;
469
470 if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
471 tmc_etb_enable_hw(drvdata);
472 } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
473 tmc_etr_enable_hw(drvdata);
474 } else {
475 mode = readl_relaxed(drvdata->base + TMC_MODE);
476 if (mode == TMC_MODE_CIRCULAR_BUFFER)
477 tmc_etb_enable_hw(drvdata);
478 }
479 out:
480 drvdata->reading = false;
481 spin_unlock_irqrestore(&drvdata->spinlock, flags);
482
483 dev_info(drvdata->dev, "TMC read end\n");
484 }
485
486 static int tmc_open(struct inode *inode, struct file *file)
487 {
488 struct tmc_drvdata *drvdata = container_of(file->private_data,
489 struct tmc_drvdata, miscdev);
490 int ret = 0;
491
492 if (drvdata->read_count++)
493 goto out;
494
495 ret = tmc_read_prepare(drvdata);
496 if (ret)
497 return ret;
498 out:
499 nonseekable_open(inode, file);
500
501 dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
502 return 0;
503 }
504
505 static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
506 loff_t *ppos)
507 {
508 struct tmc_drvdata *drvdata = container_of(file->private_data,
509 struct tmc_drvdata, miscdev);
510 char *bufp = drvdata->buf + *ppos;
511
512 if (*ppos + len > drvdata->size)
513 len = drvdata->size - *ppos;
514
515 if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
516 if (bufp == (char *)(drvdata->vaddr + drvdata->size))
517 bufp = drvdata->vaddr;
518 else if (bufp > (char *)(drvdata->vaddr + drvdata->size))
519 bufp -= drvdata->size;
520 if ((bufp + len) > (char *)(drvdata->vaddr + drvdata->size))
521 len = (char *)(drvdata->vaddr + drvdata->size) - bufp;
522 }
523
524 if (copy_to_user(data, bufp, len)) {
525 dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
526 return -EFAULT;
527 }
528
529 *ppos += len;
530
531 dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
532 __func__, len, (int)(drvdata->size - *ppos));
533 return len;
534 }
535
536 static int tmc_release(struct inode *inode, struct file *file)
537 {
538 struct tmc_drvdata *drvdata = container_of(file->private_data,
539 struct tmc_drvdata, miscdev);
540
541 if (--drvdata->read_count) {
542 if (drvdata->read_count < 0) {
543 dev_err(drvdata->dev, "mismatched close\n");
544 drvdata->read_count = 0;
545 }
546 goto out;
547 }
548
549 tmc_read_unprepare(drvdata);
550 out:
551 dev_dbg(drvdata->dev, "%s: released\n", __func__);
552 return 0;
553 }
554
555 static const struct file_operations tmc_fops = {
556 .owner = THIS_MODULE,
557 .open = tmc_open,
558 .read = tmc_read,
559 .release = tmc_release,
560 .llseek = no_llseek,
561 };
562
563 static ssize_t status_show(struct device *dev,
564 struct device_attribute *attr, char *buf)
565 {
566 unsigned long flags;
567 u32 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg;
568 u32 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr;
569 u32 devid;
570 struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
571
572 pm_runtime_get_sync(drvdata->dev);
573 spin_lock_irqsave(&drvdata->spinlock, flags);
574 CS_UNLOCK(drvdata->base);
575
576 tmc_rsz = readl_relaxed(drvdata->base + TMC_RSZ);
577 tmc_sts = readl_relaxed(drvdata->base + TMC_STS);
578 tmc_rrp = readl_relaxed(drvdata->base + TMC_RRP);
579 tmc_rwp = readl_relaxed(drvdata->base + TMC_RWP);
580 tmc_trg = readl_relaxed(drvdata->base + TMC_TRG);
581 tmc_ctl = readl_relaxed(drvdata->base + TMC_CTL);
582 tmc_ffsr = readl_relaxed(drvdata->base + TMC_FFSR);
583 tmc_ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
584 tmc_mode = readl_relaxed(drvdata->base + TMC_MODE);
585 tmc_pscr = readl_relaxed(drvdata->base + TMC_PSCR);
586 devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
587
588 CS_LOCK(drvdata->base);
589 spin_unlock_irqrestore(&drvdata->spinlock, flags);
590 pm_runtime_put(drvdata->dev);
591
592 return sprintf(buf,
593 "Depth:\t\t0x%x\n"
594 "Status:\t\t0x%x\n"
595 "RAM read ptr:\t0x%x\n"
596 "RAM wrt ptr:\t0x%x\n"
597 "Trigger cnt:\t0x%x\n"
598 "Control:\t0x%x\n"
599 "Flush status:\t0x%x\n"
600 "Flush ctrl:\t0x%x\n"
601 "Mode:\t\t0x%x\n"
602 "PSRC:\t\t0x%x\n"
603 "DEVID:\t\t0x%x\n",
604 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg,
605 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr, devid);
606
607 return -EINVAL;
608 }
609 static DEVICE_ATTR_RO(status);
610
611 static ssize_t trigger_cntr_show(struct device *dev,
612 struct device_attribute *attr, char *buf)
613 {
614 struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
615 unsigned long val = drvdata->trigger_cntr;
616
617 return sprintf(buf, "%#lx\n", val);
618 }
619
620 static ssize_t trigger_cntr_store(struct device *dev,
621 struct device_attribute *attr,
622 const char *buf, size_t size)
623 {
624 int ret;
625 unsigned long val;
626 struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
627
628 ret = kstrtoul(buf, 16, &val);
629 if (ret)
630 return ret;
631
632 drvdata->trigger_cntr = val;
633 return size;
634 }
635 static DEVICE_ATTR_RW(trigger_cntr);
636
637 static struct attribute *coresight_etb_attrs[] = {
638 &dev_attr_trigger_cntr.attr,
639 &dev_attr_status.attr,
640 NULL,
641 };
642 ATTRIBUTE_GROUPS(coresight_etb);
643
644 static struct attribute *coresight_etr_attrs[] = {
645 &dev_attr_trigger_cntr.attr,
646 &dev_attr_status.attr,
647 NULL,
648 };
649 ATTRIBUTE_GROUPS(coresight_etr);
650
651 static struct attribute *coresight_etf_attrs[] = {
652 &dev_attr_trigger_cntr.attr,
653 &dev_attr_status.attr,
654 NULL,
655 };
656 ATTRIBUTE_GROUPS(coresight_etf);
657
658 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
659 {
660 int ret = 0;
661 u32 devid;
662 void __iomem *base;
663 struct device *dev = &adev->dev;
664 struct coresight_platform_data *pdata = NULL;
665 struct tmc_drvdata *drvdata;
666 struct resource *res = &adev->res;
667 struct coresight_desc *desc;
668 struct device_node *np = adev->dev.of_node;
669
670 if (np) {
671 pdata = of_get_coresight_platform_data(dev, np);
672 if (IS_ERR(pdata))
673 return PTR_ERR(pdata);
674 adev->dev.platform_data = pdata;
675 }
676
677 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
678 if (!drvdata)
679 return -ENOMEM;
680
681 drvdata->dev = &adev->dev;
682 dev_set_drvdata(dev, drvdata);
683
684 /* Validity for the resource is already checked by the AMBA core */
685 base = devm_ioremap_resource(dev, res);
686 if (IS_ERR(base))
687 return PTR_ERR(base);
688
689 drvdata->base = base;
690
691 spin_lock_init(&drvdata->spinlock);
692
693 devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
694 drvdata->config_type = BMVAL(devid, 6, 7);
695
696 if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
697 if (np)
698 ret = of_property_read_u32(np,
699 "arm,buffer-size",
700 &drvdata->size);
701 if (ret)
702 drvdata->size = SZ_1M;
703 } else {
704 drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
705 }
706
707 pm_runtime_put(&adev->dev);
708
709 if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
710 drvdata->vaddr = dma_alloc_coherent(dev, drvdata->size,
711 &drvdata->paddr, GFP_KERNEL);
712 if (!drvdata->vaddr)
713 return -ENOMEM;
714
715 memset(drvdata->vaddr, 0, drvdata->size);
716 drvdata->buf = drvdata->vaddr;
717 } else {
718 drvdata->buf = devm_kzalloc(dev, drvdata->size, GFP_KERNEL);
719 if (!drvdata->buf)
720 return -ENOMEM;
721 }
722
723 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
724 if (!desc) {
725 ret = -ENOMEM;
726 goto err_devm_kzalloc;
727 }
728
729 desc->pdata = pdata;
730 desc->dev = dev;
731 desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
732
733 if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
734 desc->type = CORESIGHT_DEV_TYPE_SINK;
735 desc->ops = &tmc_etb_cs_ops;
736 desc->groups = coresight_etb_groups;
737 } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
738 desc->type = CORESIGHT_DEV_TYPE_SINK;
739 desc->ops = &tmc_etr_cs_ops;
740 desc->groups = coresight_etr_groups;
741 } else {
742 desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
743 desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
744 desc->ops = &tmc_etf_cs_ops;
745 desc->groups = coresight_etf_groups;
746 }
747
748 drvdata->csdev = coresight_register(desc);
749 if (IS_ERR(drvdata->csdev)) {
750 ret = PTR_ERR(drvdata->csdev);
751 goto err_devm_kzalloc;
752 }
753
754 drvdata->miscdev.name = pdata->name;
755 drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
756 drvdata->miscdev.fops = &tmc_fops;
757 ret = misc_register(&drvdata->miscdev);
758 if (ret)
759 goto err_misc_register;
760
761 dev_info(dev, "TMC initialized\n");
762 return 0;
763
764 err_misc_register:
765 coresight_unregister(drvdata->csdev);
766 err_devm_kzalloc:
767 if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
768 dma_free_coherent(dev, drvdata->size,
769 &drvdata->paddr, GFP_KERNEL);
770 return ret;
771 }
772
773 static int tmc_remove(struct amba_device *adev)
774 {
775 struct tmc_drvdata *drvdata = amba_get_drvdata(adev);
776
777 misc_deregister(&drvdata->miscdev);
778 coresight_unregister(drvdata->csdev);
779 if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
780 dma_free_coherent(drvdata->dev, drvdata->size,
781 &drvdata->paddr, GFP_KERNEL);
782
783 return 0;
784 }
785
786 static struct amba_id tmc_ids[] = {
787 {
788 .id = 0x0003b961,
789 .mask = 0x0003ffff,
790 },
791 { 0, 0},
792 };
793
794 static struct amba_driver tmc_driver = {
795 .drv = {
796 .name = "coresight-tmc",
797 .owner = THIS_MODULE,
798 },
799 .probe = tmc_probe,
800 .remove = tmc_remove,
801 .id_table = tmc_ids,
802 };
803
804 module_amba_driver(tmc_driver);
805
806 MODULE_LICENSE("GPL v2");
807 MODULE_DESCRIPTION("CoreSight Trace Memory Controller driver");
Linux with added FPC-III support