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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
4 *
5 * Description: CoreSight System Trace Macrocell driver
6 *
7 * Initial implementation by Pratik Patel
8 * (C) 2014-2015 Pratik Patel <pratikp@codeaurora.org>
9 *
10 * Serious refactoring, code cleanup and upgrading to the Coresight upstream
11 * framework by Mathieu Poirier
12 * (C) 2015-2016 Mathieu Poirier <mathieu.poirier@linaro.org>
13 *
14 * Guaranteed timing and support for various packet type coming from the
15 * generic STM API by Chunyan Zhang
16 * (C) 2015-2016 Chunyan Zhang <zhang.chunyan@linaro.org>
17 */
18#include <asm/local.h>
19#include <linux/acpi.h>
20#include <linux/amba/bus.h>
21#include <linux/bitmap.h>
22#include <linux/clk.h>
23#include <linux/coresight.h>
24#include <linux/coresight-stm.h>
25#include <linux/err.h>
26#include <linux/kernel.h>
27#include <linux/moduleparam.h>
28#include <linux/of_address.h>
29#include <linux/perf_event.h>
30#include <linux/pm_runtime.h>
31#include <linux/stm.h>
32
33#include "coresight-priv.h"
34#include "coresight-trace-id.h"
35
36#define STMDMASTARTR 0xc04
37#define STMDMASTOPR 0xc08
38#define STMDMASTATR 0xc0c
39#define STMDMACTLR 0xc10
40#define STMDMAIDR 0xcfc
41#define STMHEER 0xd00
42#define STMHETER 0xd20
43#define STMHEBSR 0xd60
44#define STMHEMCR 0xd64
45#define STMHEMASTR 0xdf4
46#define STMHEFEAT1R 0xdf8
47#define STMHEIDR 0xdfc
48#define STMSPER 0xe00
49#define STMSPTER 0xe20
50#define STMPRIVMASKR 0xe40
51#define STMSPSCR 0xe60
52#define STMSPMSCR 0xe64
53#define STMSPOVERRIDER 0xe68
54#define STMSPMOVERRIDER 0xe6c
55#define STMSPTRIGCSR 0xe70
56#define STMTCSR 0xe80
57#define STMTSSTIMR 0xe84
58#define STMTSFREQR 0xe8c
59#define STMSYNCR 0xe90
60#define STMAUXCR 0xe94
61#define STMSPFEAT1R 0xea0
62#define STMSPFEAT2R 0xea4
63#define STMSPFEAT3R 0xea8
64#define STMITTRIGGER 0xee8
65#define STMITATBDATA0 0xeec
66#define STMITATBCTR2 0xef0
67#define STMITATBID 0xef4
68#define STMITATBCTR0 0xef8
69
70#define STM_32_CHANNEL 32
71#define BYTES_PER_CHANNEL 256
72#define STM_TRACE_BUF_SIZE 4096
73#define STM_SW_MASTER_END 127
74
75/* Register bit definition */
76#define STMTCSR_BUSY_BIT 23
77/* Reserve the first 10 channels for kernel usage */
78#define STM_CHANNEL_OFFSET 0
79
80enum stm_pkt_type {
81 STM_PKT_TYPE_DATA = 0x98,
82 STM_PKT_TYPE_FLAG = 0xE8,
83 STM_PKT_TYPE_TRIG = 0xF8,
84};
85
86#define stm_channel_addr(drvdata, ch) (drvdata->chs.base + \
87 (ch * BYTES_PER_CHANNEL))
88#define stm_channel_off(type, opts) (type & ~opts)
89
90static int boot_nr_channel;
91
92/*
93 * Not really modular but using module_param is the easiest way to
94 * remain consistent with existing use cases for now.
95 */
96module_param_named(
97 boot_nr_channel, boot_nr_channel, int, S_IRUGO
98);
99
100/*
101 * struct channel_space - central management entity for extended ports
102 * @base: memory mapped base address where channels start.
103 * @phys: physical base address of channel region.
104 * @guaraneed: is the channel delivery guaranteed.
105 */
106struct channel_space {
107 void __iomem *base;
108 phys_addr_t phys;
109 unsigned long *guaranteed;
110};
111
112DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
113
114/**
115 * struct stm_drvdata - specifics associated to an STM component
116 * @base: memory mapped base address for this component.
117 * @atclk: optional clock for the core parts of the STM.
118 * @csdev: component vitals needed by the framework.
119 * @spinlock: only one at a time pls.
120 * @chs: the channels accociated to this STM.
121 * @stm: structure associated to the generic STM interface.
122 * @mode: this tracer's mode (enum cs_mode), i.e sysFS, or disabled.
123 * @traceid: value of the current ID for this component.
124 * @write_bytes: Maximus bytes this STM can write at a time.
125 * @stmsper: settings for register STMSPER.
126 * @stmspscr: settings for register STMSPSCR.
127 * @numsp: the total number of stimulus port support by this STM.
128 * @stmheer: settings for register STMHEER.
129 * @stmheter: settings for register STMHETER.
130 * @stmhebsr: settings for register STMHEBSR.
131 */
132struct stm_drvdata {
133 void __iomem *base;
134 struct clk *atclk;
135 struct coresight_device *csdev;
136 spinlock_t spinlock;
137 struct channel_space chs;
138 struct stm_data stm;
139 local_t mode;
140 u8 traceid;
141 u32 write_bytes;
142 u32 stmsper;
143 u32 stmspscr;
144 u32 numsp;
145 u32 stmheer;
146 u32 stmheter;
147 u32 stmhebsr;
148};
149
150static void stm_hwevent_enable_hw(struct stm_drvdata *drvdata)
151{
152 CS_UNLOCK(drvdata->base);
153
154 writel_relaxed(drvdata->stmhebsr, drvdata->base + STMHEBSR);
155 writel_relaxed(drvdata->stmheter, drvdata->base + STMHETER);
156 writel_relaxed(drvdata->stmheer, drvdata->base + STMHEER);
157 writel_relaxed(0x01 | /* Enable HW event tracing */
158 0x04, /* Error detection on event tracing */
159 drvdata->base + STMHEMCR);
160
161 CS_LOCK(drvdata->base);
162}
163
164static void stm_port_enable_hw(struct stm_drvdata *drvdata)
165{
166 CS_UNLOCK(drvdata->base);
167 /* ATB trigger enable on direct writes to TRIG locations */
168 writel_relaxed(0x10,
169 drvdata->base + STMSPTRIGCSR);
170 writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
171 writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
172
173 CS_LOCK(drvdata->base);
174}
175
176static void stm_enable_hw(struct stm_drvdata *drvdata)
177{
178 if (drvdata->stmheer)
179 stm_hwevent_enable_hw(drvdata);
180
181 stm_port_enable_hw(drvdata);
182
183 CS_UNLOCK(drvdata->base);
184
185 /* 4096 byte between synchronisation packets */
186 writel_relaxed(0xFFF, drvdata->base + STMSYNCR);
187 writel_relaxed((drvdata->traceid << 16 | /* trace id */
188 0x02 | /* timestamp enable */
189 0x01), /* global STM enable */
190 drvdata->base + STMTCSR);
191
192 CS_LOCK(drvdata->base);
193}
194
195static int stm_enable(struct coresight_device *csdev, struct perf_event *event,
196 enum cs_mode mode)
197{
198 u32 val;
199 struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
200
201 if (mode != CS_MODE_SYSFS)
202 return -EINVAL;
203
204 val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode);
205
206 /* Someone is already using the tracer */
207 if (val)
208 return -EBUSY;
209
210 pm_runtime_get_sync(csdev->dev.parent);
211
212 spin_lock(&drvdata->spinlock);
213 stm_enable_hw(drvdata);
214 spin_unlock(&drvdata->spinlock);
215
216 dev_dbg(&csdev->dev, "STM tracing enabled\n");
217 return 0;
218}
219
220static void stm_hwevent_disable_hw(struct stm_drvdata *drvdata)
221{
222 CS_UNLOCK(drvdata->base);
223
224 writel_relaxed(0x0, drvdata->base + STMHEMCR);
225 writel_relaxed(0x0, drvdata->base + STMHEER);
226 writel_relaxed(0x0, drvdata->base + STMHETER);
227
228 CS_LOCK(drvdata->base);
229}
230
231static void stm_port_disable_hw(struct stm_drvdata *drvdata)
232{
233 CS_UNLOCK(drvdata->base);
234
235 writel_relaxed(0x0, drvdata->base + STMSPER);
236 writel_relaxed(0x0, drvdata->base + STMSPTRIGCSR);
237
238 CS_LOCK(drvdata->base);
239}
240
241static void stm_disable_hw(struct stm_drvdata *drvdata)
242{
243 u32 val;
244
245 CS_UNLOCK(drvdata->base);
246
247 val = readl_relaxed(drvdata->base + STMTCSR);
248 val &= ~0x1; /* clear global STM enable [0] */
249 writel_relaxed(val, drvdata->base + STMTCSR);
250
251 CS_LOCK(drvdata->base);
252
253 stm_port_disable_hw(drvdata);
254 if (drvdata->stmheer)
255 stm_hwevent_disable_hw(drvdata);
256}
257
258static void stm_disable(struct coresight_device *csdev,
259 struct perf_event *event)
260{
261 struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
262 struct csdev_access *csa = &csdev->access;
263
264 /*
265 * For as long as the tracer isn't disabled another entity can't
266 * change its status. As such we can read the status here without
267 * fearing it will change under us.
268 */
269 if (local_read(&drvdata->mode) == CS_MODE_SYSFS) {
270 spin_lock(&drvdata->spinlock);
271 stm_disable_hw(drvdata);
272 spin_unlock(&drvdata->spinlock);
273
274 /* Wait until the engine has completely stopped */
275 coresight_timeout(csa, STMTCSR, STMTCSR_BUSY_BIT, 0);
276
277 pm_runtime_put(csdev->dev.parent);
278
279 local_set(&drvdata->mode, CS_MODE_DISABLED);
280 dev_dbg(&csdev->dev, "STM tracing disabled\n");
281 }
282}
283
284static const struct coresight_ops_source stm_source_ops = {
285 .enable = stm_enable,
286 .disable = stm_disable,
287};
288
289static const struct coresight_ops stm_cs_ops = {
290 .source_ops = &stm_source_ops,
291};
292
293static inline bool stm_addr_unaligned(const void *addr, u8 write_bytes)
294{
295 return ((unsigned long)addr & (write_bytes - 1));
296}
297
298static void stm_send(void __iomem *addr, const void *data,
299 u32 size, u8 write_bytes)
300{
301 u8 paload[8];
302
303 if (stm_addr_unaligned(data, write_bytes)) {
304 memcpy(paload, data, size);
305 data = paload;
306 }
307
308 /* now we are 64bit/32bit aligned */
309 switch (size) {
310#ifdef CONFIG_64BIT
311 case 8:
312 writeq_relaxed(*(u64 *)data, addr);
313 break;
314#endif
315 case 4:
316 writel_relaxed(*(u32 *)data, addr);
317 break;
318 case 2:
319 writew_relaxed(*(u16 *)data, addr);
320 break;
321 case 1:
322 writeb_relaxed(*(u8 *)data, addr);
323 break;
324 default:
325 break;
326 }
327}
328
329static int stm_generic_link(struct stm_data *stm_data,
330 unsigned int master, unsigned int channel)
331{
332 struct stm_drvdata *drvdata = container_of(stm_data,
333 struct stm_drvdata, stm);
334 if (!drvdata || !drvdata->csdev)
335 return -EINVAL;
336
337 return coresight_enable(drvdata->csdev);
338}
339
340static void stm_generic_unlink(struct stm_data *stm_data,
341 unsigned int master, unsigned int channel)
342{
343 struct stm_drvdata *drvdata = container_of(stm_data,
344 struct stm_drvdata, stm);
345 if (!drvdata || !drvdata->csdev)
346 return;
347
348 coresight_disable(drvdata->csdev);
349}
350
351static phys_addr_t
352stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
353 unsigned int channel, unsigned int nr_chans)
354{
355 struct stm_drvdata *drvdata = container_of(stm_data,
356 struct stm_drvdata, stm);
357 phys_addr_t addr;
358
359 addr = drvdata->chs.phys + channel * BYTES_PER_CHANNEL;
360
361 if (offset_in_page(addr) ||
362 offset_in_page(nr_chans * BYTES_PER_CHANNEL))
363 return 0;
364
365 return addr;
366}
367
368static long stm_generic_set_options(struct stm_data *stm_data,
369 unsigned int master,
370 unsigned int channel,
371 unsigned int nr_chans,
372 unsigned long options)
373{
374 struct stm_drvdata *drvdata = container_of(stm_data,
375 struct stm_drvdata, stm);
376 if (!(drvdata && local_read(&drvdata->mode)))
377 return -EINVAL;
378
379 if (channel >= drvdata->numsp)
380 return -EINVAL;
381
382 switch (options) {
383 case STM_OPTION_GUARANTEED:
384 set_bit(channel, drvdata->chs.guaranteed);
385 break;
386
387 case STM_OPTION_INVARIANT:
388 clear_bit(channel, drvdata->chs.guaranteed);
389 break;
390
391 default:
392 return -EINVAL;
393 }
394
395 return 0;
396}
397
398static ssize_t notrace stm_generic_packet(struct stm_data *stm_data,
399 unsigned int master,
400 unsigned int channel,
401 unsigned int packet,
402 unsigned int flags,
403 unsigned int size,
404 const unsigned char *payload)
405{
406 void __iomem *ch_addr;
407 struct stm_drvdata *drvdata = container_of(stm_data,
408 struct stm_drvdata, stm);
409 unsigned int stm_flags;
410
411 if (!(drvdata && local_read(&drvdata->mode)))
412 return -EACCES;
413
414 if (channel >= drvdata->numsp)
415 return -EINVAL;
416
417 ch_addr = stm_channel_addr(drvdata, channel);
418
419 stm_flags = (flags & STP_PACKET_TIMESTAMPED) ?
420 STM_FLAG_TIMESTAMPED : 0;
421 stm_flags |= test_bit(channel, drvdata->chs.guaranteed) ?
422 STM_FLAG_GUARANTEED : 0;
423
424 if (size > drvdata->write_bytes)
425 size = drvdata->write_bytes;
426 else
427 size = rounddown_pow_of_two(size);
428
429 switch (packet) {
430 case STP_PACKET_FLAG:
431 ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, stm_flags);
432
433 /*
434 * The generic STM core sets a size of '0' on flag packets.
435 * As such send a flag packet of size '1' and tell the
436 * core we did so.
437 */
438 stm_send(ch_addr, payload, 1, drvdata->write_bytes);
439 size = 1;
440 break;
441
442 case STP_PACKET_DATA:
443 stm_flags |= (flags & STP_PACKET_MARKED) ? STM_FLAG_MARKED : 0;
444 ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, stm_flags);
445 stm_send(ch_addr, payload, size,
446 drvdata->write_bytes);
447 break;
448
449 default:
450 return -ENOTSUPP;
451 }
452
453 return size;
454}
455
456static ssize_t hwevent_enable_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
459 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
460 unsigned long val = drvdata->stmheer;
461
462 return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
463}
464
465static ssize_t hwevent_enable_store(struct device *dev,
466 struct device_attribute *attr,
467 const char *buf, size_t size)
468{
469 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
470 unsigned long val;
471 int ret = 0;
472
473 ret = kstrtoul(buf, 16, &val);
474 if (ret)
475 return -EINVAL;
476
477 drvdata->stmheer = val;
478 /* HW event enable and trigger go hand in hand */
479 drvdata->stmheter = val;
480
481 return size;
482}
483static DEVICE_ATTR_RW(hwevent_enable);
484
485static ssize_t hwevent_select_show(struct device *dev,
486 struct device_attribute *attr, char *buf)
487{
488 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
489 unsigned long val = drvdata->stmhebsr;
490
491 return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
492}
493
494static ssize_t hwevent_select_store(struct device *dev,
495 struct device_attribute *attr,
496 const char *buf, size_t size)
497{
498 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
499 unsigned long val;
500 int ret = 0;
501
502 ret = kstrtoul(buf, 16, &val);
503 if (ret)
504 return -EINVAL;
505
506 drvdata->stmhebsr = val;
507
508 return size;
509}
510static DEVICE_ATTR_RW(hwevent_select);
511
512static ssize_t port_select_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
515 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
516 unsigned long val;
517
518 if (!local_read(&drvdata->mode)) {
519 val = drvdata->stmspscr;
520 } else {
521 spin_lock(&drvdata->spinlock);
522 val = readl_relaxed(drvdata->base + STMSPSCR);
523 spin_unlock(&drvdata->spinlock);
524 }
525
526 return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
527}
528
529static ssize_t port_select_store(struct device *dev,
530 struct device_attribute *attr,
531 const char *buf, size_t size)
532{
533 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
534 unsigned long val, stmsper;
535 int ret = 0;
536
537 ret = kstrtoul(buf, 16, &val);
538 if (ret)
539 return ret;
540
541 spin_lock(&drvdata->spinlock);
542 drvdata->stmspscr = val;
543
544 if (local_read(&drvdata->mode)) {
545 CS_UNLOCK(drvdata->base);
546 /* Process as per ARM's TRM recommendation */
547 stmsper = readl_relaxed(drvdata->base + STMSPER);
548 writel_relaxed(0x0, drvdata->base + STMSPER);
549 writel_relaxed(drvdata->stmspscr, drvdata->base + STMSPSCR);
550 writel_relaxed(stmsper, drvdata->base + STMSPER);
551 CS_LOCK(drvdata->base);
552 }
553 spin_unlock(&drvdata->spinlock);
554
555 return size;
556}
557static DEVICE_ATTR_RW(port_select);
558
559static ssize_t port_enable_show(struct device *dev,
560 struct device_attribute *attr, char *buf)
561{
562 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
563 unsigned long val;
564
565 if (!local_read(&drvdata->mode)) {
566 val = drvdata->stmsper;
567 } else {
568 spin_lock(&drvdata->spinlock);
569 val = readl_relaxed(drvdata->base + STMSPER);
570 spin_unlock(&drvdata->spinlock);
571 }
572
573 return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
574}
575
576static ssize_t port_enable_store(struct device *dev,
577 struct device_attribute *attr,
578 const char *buf, size_t size)
579{
580 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
581 unsigned long val;
582 int ret = 0;
583
584 ret = kstrtoul(buf, 16, &val);
585 if (ret)
586 return ret;
587
588 spin_lock(&drvdata->spinlock);
589 drvdata->stmsper = val;
590
591 if (local_read(&drvdata->mode)) {
592 CS_UNLOCK(drvdata->base);
593 writel_relaxed(drvdata->stmsper, drvdata->base + STMSPER);
594 CS_LOCK(drvdata->base);
595 }
596 spin_unlock(&drvdata->spinlock);
597
598 return size;
599}
600static DEVICE_ATTR_RW(port_enable);
601
602static ssize_t traceid_show(struct device *dev,
603 struct device_attribute *attr, char *buf)
604{
605 unsigned long val;
606 struct stm_drvdata *drvdata = dev_get_drvdata(dev->parent);
607
608 val = drvdata->traceid;
609 return sprintf(buf, "%#lx\n", val);
610}
611static DEVICE_ATTR_RO(traceid);
612
613static struct attribute *coresight_stm_attrs[] = {
614 &dev_attr_hwevent_enable.attr,
615 &dev_attr_hwevent_select.attr,
616 &dev_attr_port_enable.attr,
617 &dev_attr_port_select.attr,
618 &dev_attr_traceid.attr,
619 NULL,
620};
621
622static struct attribute *coresight_stm_mgmt_attrs[] = {
623 coresight_simple_reg32(tcsr, STMTCSR),
624 coresight_simple_reg32(tsfreqr, STMTSFREQR),
625 coresight_simple_reg32(syncr, STMSYNCR),
626 coresight_simple_reg32(sper, STMSPER),
627 coresight_simple_reg32(spter, STMSPTER),
628 coresight_simple_reg32(privmaskr, STMPRIVMASKR),
629 coresight_simple_reg32(spscr, STMSPSCR),
630 coresight_simple_reg32(spmscr, STMSPMSCR),
631 coresight_simple_reg32(spfeat1r, STMSPFEAT1R),
632 coresight_simple_reg32(spfeat2r, STMSPFEAT2R),
633 coresight_simple_reg32(spfeat3r, STMSPFEAT3R),
634 coresight_simple_reg32(devid, CORESIGHT_DEVID),
635 NULL,
636};
637
638static const struct attribute_group coresight_stm_group = {
639 .attrs = coresight_stm_attrs,
640};
641
642static const struct attribute_group coresight_stm_mgmt_group = {
643 .attrs = coresight_stm_mgmt_attrs,
644 .name = "mgmt",
645};
646
647static const struct attribute_group *coresight_stm_groups[] = {
648 &coresight_stm_group,
649 &coresight_stm_mgmt_group,
650 NULL,
651};
652
653#ifdef CONFIG_OF
654static int of_stm_get_stimulus_area(struct device *dev, struct resource *res)
655{
656 const char *name = NULL;
657 int index = 0, found = 0;
658 struct device_node *np = dev->of_node;
659
660 while (!of_property_read_string_index(np, "reg-names", index, &name)) {
661 if (strcmp("stm-stimulus-base", name)) {
662 index++;
663 continue;
664 }
665
666 /* We have a match and @index is where it's at */
667 found = 1;
668 break;
669 }
670
671 if (!found)
672 return -EINVAL;
673
674 return of_address_to_resource(np, index, res);
675}
676#else
677static inline int of_stm_get_stimulus_area(struct device *dev,
678 struct resource *res)
679{
680 return -ENOENT;
681}
682#endif
683
684#ifdef CONFIG_ACPI
685static int acpi_stm_get_stimulus_area(struct device *dev, struct resource *res)
686{
687 int rc;
688 bool found_base = false;
689 struct resource_entry *rent;
690 LIST_HEAD(res_list);
691
692 struct acpi_device *adev = ACPI_COMPANION(dev);
693
694 rc = acpi_dev_get_resources(adev, &res_list, NULL, NULL);
695 if (rc < 0)
696 return rc;
697
698 /*
699 * The stimulus base for STM device must be listed as the second memory
700 * resource, followed by the programming base address as described in
701 * "Section 2.3 Resources" in ACPI for CoreSightTM 1.0 Platform Design
702 * document (DEN0067).
703 */
704 rc = -ENOENT;
705 list_for_each_entry(rent, &res_list, node) {
706 if (resource_type(rent->res) != IORESOURCE_MEM)
707 continue;
708 if (found_base) {
709 *res = *rent->res;
710 rc = 0;
711 break;
712 }
713
714 found_base = true;
715 }
716
717 acpi_dev_free_resource_list(&res_list);
718 return rc;
719}
720#else
721static inline int acpi_stm_get_stimulus_area(struct device *dev,
722 struct resource *res)
723{
724 return -ENOENT;
725}
726#endif
727
728static int stm_get_stimulus_area(struct device *dev, struct resource *res)
729{
730 struct fwnode_handle *fwnode = dev_fwnode(dev);
731
732 if (is_of_node(fwnode))
733 return of_stm_get_stimulus_area(dev, res);
734 else if (is_acpi_node(fwnode))
735 return acpi_stm_get_stimulus_area(dev, res);
736 return -ENOENT;
737}
738
739static u32 stm_fundamental_data_size(struct stm_drvdata *drvdata)
740{
741 u32 stmspfeat2r;
742
743 if (!IS_ENABLED(CONFIG_64BIT))
744 return 4;
745
746 stmspfeat2r = readl_relaxed(drvdata->base + STMSPFEAT2R);
747
748 /*
749 * bit[15:12] represents the fundamental data size
750 * 0 - 32-bit data
751 * 1 - 64-bit data
752 */
753 return BMVAL(stmspfeat2r, 12, 15) ? 8 : 4;
754}
755
756static u32 stm_num_stimulus_port(struct stm_drvdata *drvdata)
757{
758 u32 numsp;
759
760 numsp = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
761 /*
762 * NUMPS in STMDEVID is 17 bit long and if equal to 0x0,
763 * 32 stimulus ports are supported.
764 */
765 numsp &= 0x1ffff;
766 if (!numsp)
767 numsp = STM_32_CHANNEL;
768 return numsp;
769}
770
771static void stm_init_default_data(struct stm_drvdata *drvdata)
772{
773 /* Don't use port selection */
774 drvdata->stmspscr = 0x0;
775 /*
776 * Enable all channel regardless of their number. When port
777 * selection isn't used (see above) STMSPER applies to all
778 * 32 channel group available, hence setting all 32 bits to 1
779 */
780 drvdata->stmsper = ~0x0;
781
782 /* Set invariant transaction timing on all channels */
783 bitmap_clear(drvdata->chs.guaranteed, 0, drvdata->numsp);
784}
785
786static void stm_init_generic_data(struct stm_drvdata *drvdata,
787 const char *name)
788{
789 drvdata->stm.name = name;
790
791 /*
792 * MasterIDs are assigned at HW design phase. As such the core is
793 * using a single master for interaction with this device.
794 */
795 drvdata->stm.sw_start = 1;
796 drvdata->stm.sw_end = 1;
797 drvdata->stm.hw_override = true;
798 drvdata->stm.sw_nchannels = drvdata->numsp;
799 drvdata->stm.sw_mmiosz = BYTES_PER_CHANNEL;
800 drvdata->stm.packet = stm_generic_packet;
801 drvdata->stm.mmio_addr = stm_mmio_addr;
802 drvdata->stm.link = stm_generic_link;
803 drvdata->stm.unlink = stm_generic_unlink;
804 drvdata->stm.set_options = stm_generic_set_options;
805}
806
807static int stm_probe(struct amba_device *adev, const struct amba_id *id)
808{
809 int ret, trace_id;
810 void __iomem *base;
811 struct device *dev = &adev->dev;
812 struct coresight_platform_data *pdata = NULL;
813 struct stm_drvdata *drvdata;
814 struct resource *res = &adev->res;
815 struct resource ch_res;
816 struct coresight_desc desc = { 0 };
817
818 desc.name = coresight_alloc_device_name(&stm_devs, dev);
819 if (!desc.name)
820 return -ENOMEM;
821
822 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
823 if (!drvdata)
824 return -ENOMEM;
825
826 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
827 if (!IS_ERR(drvdata->atclk)) {
828 ret = clk_prepare_enable(drvdata->atclk);
829 if (ret)
830 return ret;
831 }
832 dev_set_drvdata(dev, drvdata);
833
834 base = devm_ioremap_resource(dev, res);
835 if (IS_ERR(base))
836 return PTR_ERR(base);
837 drvdata->base = base;
838 desc.access = CSDEV_ACCESS_IOMEM(base);
839
840 ret = stm_get_stimulus_area(dev, &ch_res);
841 if (ret)
842 return ret;
843 drvdata->chs.phys = ch_res.start;
844
845 base = devm_ioremap_resource(dev, &ch_res);
846 if (IS_ERR(base))
847 return PTR_ERR(base);
848 drvdata->chs.base = base;
849
850 drvdata->write_bytes = stm_fundamental_data_size(drvdata);
851
852 if (boot_nr_channel)
853 drvdata->numsp = boot_nr_channel;
854 else
855 drvdata->numsp = stm_num_stimulus_port(drvdata);
856
857 drvdata->chs.guaranteed = devm_bitmap_zalloc(dev, drvdata->numsp,
858 GFP_KERNEL);
859 if (!drvdata->chs.guaranteed)
860 return -ENOMEM;
861
862 spin_lock_init(&drvdata->spinlock);
863
864 stm_init_default_data(drvdata);
865 stm_init_generic_data(drvdata, desc.name);
866
867 if (stm_register_device(dev, &drvdata->stm, THIS_MODULE)) {
868 dev_info(dev,
869 "%s : stm_register_device failed, probing deferred\n",
870 desc.name);
871 return -EPROBE_DEFER;
872 }
873
874 pdata = coresight_get_platform_data(dev);
875 if (IS_ERR(pdata)) {
876 ret = PTR_ERR(pdata);
877 goto stm_unregister;
878 }
879 adev->dev.platform_data = pdata;
880
881 desc.type = CORESIGHT_DEV_TYPE_SOURCE;
882 desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
883 desc.ops = &stm_cs_ops;
884 desc.pdata = pdata;
885 desc.dev = dev;
886 desc.groups = coresight_stm_groups;
887 drvdata->csdev = coresight_register(&desc);
888 if (IS_ERR(drvdata->csdev)) {
889 ret = PTR_ERR(drvdata->csdev);
890 goto stm_unregister;
891 }
892
893 trace_id = coresight_trace_id_get_system_id();
894 if (trace_id < 0) {
895 ret = trace_id;
896 goto cs_unregister;
897 }
898 drvdata->traceid = (u8)trace_id;
899
900 pm_runtime_put(&adev->dev);
901
902 dev_info(&drvdata->csdev->dev, "%s initialized\n",
903 (char *)coresight_get_uci_data(id));
904 return 0;
905
906cs_unregister:
907 coresight_unregister(drvdata->csdev);
908
909stm_unregister:
910 stm_unregister_device(&drvdata->stm);
911 return ret;
912}
913
914static void stm_remove(struct amba_device *adev)
915{
916 struct stm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
917
918 coresight_trace_id_put_system_id(drvdata->traceid);
919 coresight_unregister(drvdata->csdev);
920
921 stm_unregister_device(&drvdata->stm);
922}
923
924#ifdef CONFIG_PM
925static int stm_runtime_suspend(struct device *dev)
926{
927 struct stm_drvdata *drvdata = dev_get_drvdata(dev);
928
929 if (drvdata && !IS_ERR(drvdata->atclk))
930 clk_disable_unprepare(drvdata->atclk);
931
932 return 0;
933}
934
935static int stm_runtime_resume(struct device *dev)
936{
937 struct stm_drvdata *drvdata = dev_get_drvdata(dev);
938
939 if (drvdata && !IS_ERR(drvdata->atclk))
940 clk_prepare_enable(drvdata->atclk);
941
942 return 0;
943}
944#endif
945
946static const struct dev_pm_ops stm_dev_pm_ops = {
947 SET_RUNTIME_PM_OPS(stm_runtime_suspend, stm_runtime_resume, NULL)
948};
949
950static const struct amba_id stm_ids[] = {
951 CS_AMBA_ID_DATA(0x000bb962, "STM32"),
952 CS_AMBA_ID_DATA(0x000bb963, "STM500"),
953 { 0, 0},
954};
955
956MODULE_DEVICE_TABLE(amba, stm_ids);
957
958static struct amba_driver stm_driver = {
959 .drv = {
960 .name = "coresight-stm",
961 .owner = THIS_MODULE,
962 .pm = &stm_dev_pm_ops,
963 .suppress_bind_attrs = true,
964 },
965 .probe = stm_probe,
966 .remove = stm_remove,
967 .id_table = stm_ids,
968};
969
970module_amba_driver(stm_driver);
971
972MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
973MODULE_DESCRIPTION("Arm CoreSight System Trace Macrocell driver");
974MODULE_LICENSE("GPL v2");