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