Commit | Line | Data |
---|---|---|
c5d6c770 AS |
1 | /* |
2 | * linux/arch/arm/kernel/etm.c | |
3 | * | |
4 | * Driver for ARM's Embedded Trace Macrocell and Embedded Trace Buffer. | |
5 | * | |
6 | * Copyright (C) 2009 Nokia Corporation. | |
7 | * Alexander Shishkin | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/sysrq.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/clk.h> | |
21 | #include <linux/amba/bus.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/miscdevice.h> | |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/mutex.h> | |
73017a54 | 27 | #include <linux/module.h> |
c5d6c770 AS |
28 | #include <asm/hardware/coresight.h> |
29 | #include <asm/sections.h> | |
30 | ||
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("Alexander Shishkin"); | |
33 | ||
8234eaef AS |
34 | /* |
35 | * ETM tracer state | |
36 | */ | |
37 | struct tracectx { | |
38 | unsigned int etb_bufsz; | |
39 | void __iomem *etb_regs; | |
40 | void __iomem *etm_regs; | |
41 | unsigned long flags; | |
42 | int ncmppairs; | |
43 | int etm_portsz; | |
44 | struct device *dev; | |
45 | struct clk *emu_clk; | |
46 | struct mutex mutex; | |
47 | }; | |
48 | ||
c5d6c770 AS |
49 | static struct tracectx tracer; |
50 | ||
51 | static inline bool trace_isrunning(struct tracectx *t) | |
52 | { | |
53 | return !!(t->flags & TRACER_RUNNING); | |
54 | } | |
55 | ||
56 | static int etm_setup_address_range(struct tracectx *t, int n, | |
57 | unsigned long start, unsigned long end, int exclude, int data) | |
58 | { | |
59 | u32 flags = ETMAAT_ARM | ETMAAT_IGNCONTEXTID | ETMAAT_NSONLY | \ | |
60 | ETMAAT_NOVALCMP; | |
61 | ||
62 | if (n < 1 || n > t->ncmppairs) | |
63 | return -EINVAL; | |
64 | ||
65 | /* comparators and ranges are numbered starting with 1 as opposed | |
66 | * to bits in a word */ | |
67 | n--; | |
68 | ||
69 | if (data) | |
70 | flags |= ETMAAT_DLOADSTORE; | |
71 | else | |
72 | flags |= ETMAAT_IEXEC; | |
73 | ||
74 | /* first comparator for the range */ | |
75 | etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2)); | |
76 | etm_writel(t, start, ETMR_COMP_VAL(n * 2)); | |
77 | ||
78 | /* second comparator is right next to it */ | |
79 | etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2 + 1)); | |
80 | etm_writel(t, end, ETMR_COMP_VAL(n * 2 + 1)); | |
81 | ||
82 | flags = exclude ? ETMTE_INCLEXCL : 0; | |
83 | etm_writel(t, flags | (1 << n), ETMR_TRACEENCTRL); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int trace_start(struct tracectx *t) | |
89 | { | |
90 | u32 v; | |
91 | unsigned long timeout = TRACER_TIMEOUT; | |
92 | ||
93 | etb_unlock(t); | |
94 | ||
95 | etb_writel(t, 0, ETBR_FORMATTERCTRL); | |
96 | etb_writel(t, 1, ETBR_CTRL); | |
97 | ||
98 | etb_lock(t); | |
99 | ||
100 | /* configure etm */ | |
101 | v = ETMCTRL_OPTS | ETMCTRL_PROGRAM | ETMCTRL_PORTSIZE(t->etm_portsz); | |
102 | ||
103 | if (t->flags & TRACER_CYCLE_ACC) | |
104 | v |= ETMCTRL_CYCLEACCURATE; | |
105 | ||
106 | etm_unlock(t); | |
107 | ||
108 | etm_writel(t, v, ETMR_CTRL); | |
109 | ||
110 | while (!(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout) | |
111 | ; | |
112 | if (!timeout) { | |
113 | dev_dbg(t->dev, "Waiting for progbit to assert timed out\n"); | |
114 | etm_lock(t); | |
115 | return -EFAULT; | |
116 | } | |
117 | ||
118 | etm_setup_address_range(t, 1, (unsigned long)_stext, | |
119 | (unsigned long)_etext, 0, 0); | |
120 | etm_writel(t, 0, ETMR_TRACEENCTRL2); | |
121 | etm_writel(t, 0, ETMR_TRACESSCTRL); | |
122 | etm_writel(t, 0x6f, ETMR_TRACEENEVT); | |
123 | ||
124 | v &= ~ETMCTRL_PROGRAM; | |
125 | v |= ETMCTRL_PORTSEL; | |
126 | ||
127 | etm_writel(t, v, ETMR_CTRL); | |
128 | ||
129 | timeout = TRACER_TIMEOUT; | |
130 | while (etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM && --timeout) | |
131 | ; | |
132 | if (!timeout) { | |
133 | dev_dbg(t->dev, "Waiting for progbit to deassert timed out\n"); | |
134 | etm_lock(t); | |
135 | return -EFAULT; | |
136 | } | |
137 | ||
138 | etm_lock(t); | |
139 | ||
140 | t->flags |= TRACER_RUNNING; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int trace_stop(struct tracectx *t) | |
146 | { | |
147 | unsigned long timeout = TRACER_TIMEOUT; | |
148 | ||
149 | etm_unlock(t); | |
150 | ||
151 | etm_writel(t, 0x440, ETMR_CTRL); | |
152 | while (!(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout) | |
153 | ; | |
154 | if (!timeout) { | |
155 | dev_dbg(t->dev, "Waiting for progbit to assert timed out\n"); | |
156 | etm_lock(t); | |
157 | return -EFAULT; | |
158 | } | |
159 | ||
160 | etm_lock(t); | |
161 | ||
162 | etb_unlock(t); | |
163 | etb_writel(t, ETBFF_MANUAL_FLUSH, ETBR_FORMATTERCTRL); | |
164 | ||
165 | timeout = TRACER_TIMEOUT; | |
166 | while (etb_readl(t, ETBR_FORMATTERCTRL) & | |
167 | ETBFF_MANUAL_FLUSH && --timeout) | |
168 | ; | |
169 | if (!timeout) { | |
170 | dev_dbg(t->dev, "Waiting for formatter flush to commence " | |
171 | "timed out\n"); | |
172 | etb_lock(t); | |
173 | return -EFAULT; | |
174 | } | |
175 | ||
176 | etb_writel(t, 0, ETBR_CTRL); | |
177 | ||
178 | etb_lock(t); | |
179 | ||
180 | t->flags &= ~TRACER_RUNNING; | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | static int etb_getdatalen(struct tracectx *t) | |
186 | { | |
187 | u32 v; | |
188 | int rp, wp; | |
189 | ||
190 | v = etb_readl(t, ETBR_STATUS); | |
191 | ||
192 | if (v & 1) | |
193 | return t->etb_bufsz; | |
194 | ||
195 | rp = etb_readl(t, ETBR_READADDR); | |
196 | wp = etb_readl(t, ETBR_WRITEADDR); | |
197 | ||
198 | if (rp > wp) { | |
199 | etb_writel(t, 0, ETBR_READADDR); | |
200 | etb_writel(t, 0, ETBR_WRITEADDR); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | return wp - rp; | |
206 | } | |
207 | ||
208 | /* sysrq+v will always stop the running trace and leave it at that */ | |
209 | static void etm_dump(void) | |
210 | { | |
211 | struct tracectx *t = &tracer; | |
212 | u32 first = 0; | |
213 | int length; | |
214 | ||
215 | if (!t->etb_regs) { | |
216 | printk(KERN_INFO "No tracing hardware found\n"); | |
217 | return; | |
218 | } | |
219 | ||
220 | if (trace_isrunning(t)) | |
221 | trace_stop(t); | |
222 | ||
223 | etb_unlock(t); | |
224 | ||
225 | length = etb_getdatalen(t); | |
226 | ||
227 | if (length == t->etb_bufsz) | |
228 | first = etb_readl(t, ETBR_WRITEADDR); | |
229 | ||
230 | etb_writel(t, first, ETBR_READADDR); | |
231 | ||
232 | printk(KERN_INFO "Trace buffer contents length: %d\n", length); | |
233 | printk(KERN_INFO "--- ETB buffer begin ---\n"); | |
234 | for (; length; length--) | |
235 | printk("%08x", cpu_to_be32(etb_readl(t, ETBR_READMEM))); | |
236 | printk(KERN_INFO "\n--- ETB buffer end ---\n"); | |
237 | ||
238 | /* deassert the overflow bit */ | |
239 | etb_writel(t, 1, ETBR_CTRL); | |
240 | etb_writel(t, 0, ETBR_CTRL); | |
241 | ||
242 | etb_writel(t, 0, ETBR_TRIGGERCOUNT); | |
243 | etb_writel(t, 0, ETBR_READADDR); | |
244 | etb_writel(t, 0, ETBR_WRITEADDR); | |
245 | ||
246 | etb_lock(t); | |
247 | } | |
248 | ||
1495cc9d | 249 | static void sysrq_etm_dump(int key) |
c5d6c770 AS |
250 | { |
251 | dev_dbg(tracer.dev, "Dumping ETB buffer\n"); | |
252 | etm_dump(); | |
253 | } | |
254 | ||
255 | static struct sysrq_key_op sysrq_etm_op = { | |
256 | .handler = sysrq_etm_dump, | |
9387a393 | 257 | .help_msg = "etm-buffer-dump(v)", |
c5d6c770 AS |
258 | .action_msg = "etm", |
259 | }; | |
260 | ||
261 | static int etb_open(struct inode *inode, struct file *file) | |
262 | { | |
263 | if (!tracer.etb_regs) | |
264 | return -ENODEV; | |
265 | ||
266 | file->private_data = &tracer; | |
267 | ||
268 | return nonseekable_open(inode, file); | |
269 | } | |
270 | ||
271 | static ssize_t etb_read(struct file *file, char __user *data, | |
272 | size_t len, loff_t *ppos) | |
273 | { | |
274 | int total, i; | |
275 | long length; | |
276 | struct tracectx *t = file->private_data; | |
277 | u32 first = 0; | |
278 | u32 *buf; | |
279 | ||
280 | mutex_lock(&t->mutex); | |
281 | ||
282 | if (trace_isrunning(t)) { | |
283 | length = 0; | |
284 | goto out; | |
285 | } | |
286 | ||
287 | etb_unlock(t); | |
288 | ||
289 | total = etb_getdatalen(t); | |
290 | if (total == t->etb_bufsz) | |
291 | first = etb_readl(t, ETBR_WRITEADDR); | |
292 | ||
293 | etb_writel(t, first, ETBR_READADDR); | |
294 | ||
295 | length = min(total * 4, (int)len); | |
296 | buf = vmalloc(length); | |
297 | ||
298 | dev_dbg(t->dev, "ETB buffer length: %d\n", total); | |
299 | dev_dbg(t->dev, "ETB status reg: %x\n", etb_readl(t, ETBR_STATUS)); | |
300 | for (i = 0; i < length / 4; i++) | |
301 | buf[i] = etb_readl(t, ETBR_READMEM); | |
302 | ||
303 | /* the only way to deassert overflow bit in ETB status is this */ | |
304 | etb_writel(t, 1, ETBR_CTRL); | |
305 | etb_writel(t, 0, ETBR_CTRL); | |
306 | ||
307 | etb_writel(t, 0, ETBR_WRITEADDR); | |
308 | etb_writel(t, 0, ETBR_READADDR); | |
309 | etb_writel(t, 0, ETBR_TRIGGERCOUNT); | |
310 | ||
311 | etb_lock(t); | |
312 | ||
313 | length -= copy_to_user(data, buf, length); | |
314 | vfree(buf); | |
315 | ||
316 | out: | |
317 | mutex_unlock(&t->mutex); | |
318 | ||
319 | return length; | |
320 | } | |
321 | ||
322 | static int etb_release(struct inode *inode, struct file *file) | |
323 | { | |
324 | /* there's nothing to do here, actually */ | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static const struct file_operations etb_fops = { | |
329 | .owner = THIS_MODULE, | |
330 | .read = etb_read, | |
331 | .open = etb_open, | |
332 | .release = etb_release, | |
6038f373 | 333 | .llseek = no_llseek, |
c5d6c770 AS |
334 | }; |
335 | ||
336 | static struct miscdevice etb_miscdev = { | |
337 | .name = "tracebuf", | |
338 | .minor = 0, | |
339 | .fops = &etb_fops, | |
340 | }; | |
341 | ||
351a102d | 342 | static int etb_probe(struct amba_device *dev, const struct amba_id *id) |
c5d6c770 AS |
343 | { |
344 | struct tracectx *t = &tracer; | |
345 | int ret = 0; | |
346 | ||
347 | ret = amba_request_regions(dev, NULL); | |
348 | if (ret) | |
349 | goto out; | |
350 | ||
351 | t->etb_regs = ioremap_nocache(dev->res.start, resource_size(&dev->res)); | |
352 | if (!t->etb_regs) { | |
353 | ret = -ENOMEM; | |
354 | goto out_release; | |
355 | } | |
356 | ||
357 | amba_set_drvdata(dev, t); | |
358 | ||
359 | etb_miscdev.parent = &dev->dev; | |
360 | ||
361 | ret = misc_register(&etb_miscdev); | |
362 | if (ret) | |
363 | goto out_unmap; | |
364 | ||
365 | t->emu_clk = clk_get(&dev->dev, "emu_src_ck"); | |
366 | if (IS_ERR(t->emu_clk)) { | |
367 | dev_dbg(&dev->dev, "Failed to obtain emu_src_ck.\n"); | |
368 | return -EFAULT; | |
369 | } | |
370 | ||
371 | clk_enable(t->emu_clk); | |
372 | ||
373 | etb_unlock(t); | |
374 | t->etb_bufsz = etb_readl(t, ETBR_DEPTH); | |
375 | dev_dbg(&dev->dev, "Size: %x\n", t->etb_bufsz); | |
376 | ||
377 | /* make sure trace capture is disabled */ | |
378 | etb_writel(t, 0, ETBR_CTRL); | |
379 | etb_writel(t, 0x1000, ETBR_FORMATTERCTRL); | |
380 | etb_lock(t); | |
381 | ||
382 | dev_dbg(&dev->dev, "ETB AMBA driver initialized.\n"); | |
383 | ||
384 | out: | |
385 | return ret; | |
386 | ||
387 | out_unmap: | |
c5d6c770 AS |
388 | iounmap(t->etb_regs); |
389 | ||
390 | out_release: | |
391 | amba_release_regions(dev); | |
392 | ||
393 | return ret; | |
394 | } | |
395 | ||
396 | static int etb_remove(struct amba_device *dev) | |
397 | { | |
398 | struct tracectx *t = amba_get_drvdata(dev); | |
399 | ||
c5d6c770 AS |
400 | iounmap(t->etb_regs); |
401 | t->etb_regs = NULL; | |
402 | ||
403 | clk_disable(t->emu_clk); | |
404 | clk_put(t->emu_clk); | |
405 | ||
406 | amba_release_regions(dev); | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
411 | static struct amba_id etb_ids[] = { | |
412 | { | |
413 | .id = 0x0003b907, | |
414 | .mask = 0x0007ffff, | |
415 | }, | |
416 | { 0, 0 }, | |
417 | }; | |
418 | ||
419 | static struct amba_driver etb_driver = { | |
420 | .drv = { | |
421 | .name = "etb", | |
422 | .owner = THIS_MODULE, | |
423 | }, | |
424 | .probe = etb_probe, | |
425 | .remove = etb_remove, | |
426 | .id_table = etb_ids, | |
427 | }; | |
428 | ||
429 | /* use a sysfs file "trace_running" to start/stop tracing */ | |
430 | static ssize_t trace_running_show(struct kobject *kobj, | |
431 | struct kobj_attribute *attr, | |
432 | char *buf) | |
433 | { | |
434 | return sprintf(buf, "%x\n", trace_isrunning(&tracer)); | |
435 | } | |
436 | ||
437 | static ssize_t trace_running_store(struct kobject *kobj, | |
438 | struct kobj_attribute *attr, | |
439 | const char *buf, size_t n) | |
440 | { | |
441 | unsigned int value; | |
442 | int ret; | |
443 | ||
444 | if (sscanf(buf, "%u", &value) != 1) | |
445 | return -EINVAL; | |
446 | ||
447 | mutex_lock(&tracer.mutex); | |
448 | ret = value ? trace_start(&tracer) : trace_stop(&tracer); | |
449 | mutex_unlock(&tracer.mutex); | |
450 | ||
451 | return ret ? : n; | |
452 | } | |
453 | ||
454 | static struct kobj_attribute trace_running_attr = | |
455 | __ATTR(trace_running, 0644, trace_running_show, trace_running_store); | |
456 | ||
457 | static ssize_t trace_info_show(struct kobject *kobj, | |
458 | struct kobj_attribute *attr, | |
459 | char *buf) | |
460 | { | |
461 | u32 etb_wa, etb_ra, etb_st, etb_fc, etm_ctrl, etm_st; | |
462 | int datalen; | |
463 | ||
464 | etb_unlock(&tracer); | |
465 | datalen = etb_getdatalen(&tracer); | |
466 | etb_wa = etb_readl(&tracer, ETBR_WRITEADDR); | |
467 | etb_ra = etb_readl(&tracer, ETBR_READADDR); | |
468 | etb_st = etb_readl(&tracer, ETBR_STATUS); | |
469 | etb_fc = etb_readl(&tracer, ETBR_FORMATTERCTRL); | |
470 | etb_lock(&tracer); | |
471 | ||
472 | etm_unlock(&tracer); | |
473 | etm_ctrl = etm_readl(&tracer, ETMR_CTRL); | |
474 | etm_st = etm_readl(&tracer, ETMR_STATUS); | |
475 | etm_lock(&tracer); | |
476 | ||
477 | return sprintf(buf, "Trace buffer len: %d\nComparator pairs: %d\n" | |
478 | "ETBR_WRITEADDR:\t%08x\n" | |
479 | "ETBR_READADDR:\t%08x\n" | |
480 | "ETBR_STATUS:\t%08x\n" | |
481 | "ETBR_FORMATTERCTRL:\t%08x\n" | |
482 | "ETMR_CTRL:\t%08x\n" | |
483 | "ETMR_STATUS:\t%08x\n", | |
484 | datalen, | |
485 | tracer.ncmppairs, | |
486 | etb_wa, | |
487 | etb_ra, | |
488 | etb_st, | |
489 | etb_fc, | |
490 | etm_ctrl, | |
491 | etm_st | |
492 | ); | |
493 | } | |
494 | ||
495 | static struct kobj_attribute trace_info_attr = | |
496 | __ATTR(trace_info, 0444, trace_info_show, NULL); | |
497 | ||
498 | static ssize_t trace_mode_show(struct kobject *kobj, | |
499 | struct kobj_attribute *attr, | |
500 | char *buf) | |
501 | { | |
502 | return sprintf(buf, "%d %d\n", | |
503 | !!(tracer.flags & TRACER_CYCLE_ACC), | |
504 | tracer.etm_portsz); | |
505 | } | |
506 | ||
507 | static ssize_t trace_mode_store(struct kobject *kobj, | |
508 | struct kobj_attribute *attr, | |
509 | const char *buf, size_t n) | |
510 | { | |
511 | unsigned int cycacc, portsz; | |
512 | ||
513 | if (sscanf(buf, "%u %u", &cycacc, &portsz) != 2) | |
514 | return -EINVAL; | |
515 | ||
516 | mutex_lock(&tracer.mutex); | |
517 | if (cycacc) | |
518 | tracer.flags |= TRACER_CYCLE_ACC; | |
519 | else | |
520 | tracer.flags &= ~TRACER_CYCLE_ACC; | |
521 | ||
522 | tracer.etm_portsz = portsz & 0x0f; | |
523 | mutex_unlock(&tracer.mutex); | |
524 | ||
525 | return n; | |
526 | } | |
527 | ||
528 | static struct kobj_attribute trace_mode_attr = | |
529 | __ATTR(trace_mode, 0644, trace_mode_show, trace_mode_store); | |
530 | ||
351a102d | 531 | static int etm_probe(struct amba_device *dev, const struct amba_id *id) |
c5d6c770 AS |
532 | { |
533 | struct tracectx *t = &tracer; | |
534 | int ret = 0; | |
535 | ||
536 | if (t->etm_regs) { | |
537 | dev_dbg(&dev->dev, "ETM already initialized\n"); | |
538 | ret = -EBUSY; | |
539 | goto out; | |
540 | } | |
541 | ||
542 | ret = amba_request_regions(dev, NULL); | |
543 | if (ret) | |
544 | goto out; | |
545 | ||
546 | t->etm_regs = ioremap_nocache(dev->res.start, resource_size(&dev->res)); | |
547 | if (!t->etm_regs) { | |
548 | ret = -ENOMEM; | |
549 | goto out_release; | |
550 | } | |
551 | ||
552 | amba_set_drvdata(dev, t); | |
553 | ||
554 | mutex_init(&t->mutex); | |
555 | t->dev = &dev->dev; | |
556 | t->flags = TRACER_CYCLE_ACC; | |
557 | t->etm_portsz = 1; | |
558 | ||
559 | etm_unlock(t); | |
988257cf AS |
560 | (void)etm_readl(t, ETMMR_PDSR); |
561 | /* dummy first read */ | |
562 | (void)etm_readl(&tracer, ETMMR_OSSRR); | |
c5d6c770 AS |
563 | |
564 | t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf; | |
565 | etm_writel(t, 0x440, ETMR_CTRL); | |
566 | etm_lock(t); | |
567 | ||
568 | ret = sysfs_create_file(&dev->dev.kobj, | |
569 | &trace_running_attr.attr); | |
570 | if (ret) | |
571 | goto out_unmap; | |
572 | ||
573 | /* failing to create any of these two is not fatal */ | |
574 | ret = sysfs_create_file(&dev->dev.kobj, &trace_info_attr.attr); | |
575 | if (ret) | |
576 | dev_dbg(&dev->dev, "Failed to create trace_info in sysfs\n"); | |
577 | ||
578 | ret = sysfs_create_file(&dev->dev.kobj, &trace_mode_attr.attr); | |
579 | if (ret) | |
580 | dev_dbg(&dev->dev, "Failed to create trace_mode in sysfs\n"); | |
581 | ||
582 | dev_dbg(t->dev, "ETM AMBA driver initialized.\n"); | |
583 | ||
584 | out: | |
585 | return ret; | |
586 | ||
587 | out_unmap: | |
c5d6c770 AS |
588 | iounmap(t->etm_regs); |
589 | ||
590 | out_release: | |
591 | amba_release_regions(dev); | |
592 | ||
593 | return ret; | |
594 | } | |
595 | ||
596 | static int etm_remove(struct amba_device *dev) | |
597 | { | |
598 | struct tracectx *t = amba_get_drvdata(dev); | |
599 | ||
c5d6c770 AS |
600 | iounmap(t->etm_regs); |
601 | t->etm_regs = NULL; | |
602 | ||
603 | amba_release_regions(dev); | |
604 | ||
605 | sysfs_remove_file(&dev->dev.kobj, &trace_running_attr.attr); | |
606 | sysfs_remove_file(&dev->dev.kobj, &trace_info_attr.attr); | |
607 | sysfs_remove_file(&dev->dev.kobj, &trace_mode_attr.attr); | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | static struct amba_id etm_ids[] = { | |
613 | { | |
614 | .id = 0x0003b921, | |
615 | .mask = 0x0007ffff, | |
616 | }, | |
617 | { 0, 0 }, | |
618 | }; | |
619 | ||
620 | static struct amba_driver etm_driver = { | |
621 | .drv = { | |
622 | .name = "etm", | |
623 | .owner = THIS_MODULE, | |
624 | }, | |
625 | .probe = etm_probe, | |
626 | .remove = etm_remove, | |
627 | .id_table = etm_ids, | |
628 | }; | |
629 | ||
630 | static int __init etm_init(void) | |
631 | { | |
632 | int retval; | |
633 | ||
634 | retval = amba_driver_register(&etb_driver); | |
635 | if (retval) { | |
636 | printk(KERN_ERR "Failed to register etb\n"); | |
637 | return retval; | |
638 | } | |
639 | ||
640 | retval = amba_driver_register(&etm_driver); | |
641 | if (retval) { | |
642 | amba_driver_unregister(&etb_driver); | |
643 | printk(KERN_ERR "Failed to probe etm\n"); | |
644 | return retval; | |
645 | } | |
646 | ||
647 | /* not being able to install this handler is not fatal */ | |
648 | (void)register_sysrq_key('v', &sysrq_etm_op); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | device_initcall(etm_init); | |
654 |