1 // SPDX-License-Identifier: GPL-2.0-only
3 * exynos_ppmu.c - Exynos PPMU (Platform Performance Monitoring Unit) support
5 * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
6 * Author : Chanwoo Choi <cw00.choi@samsung.com>
8 * This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
11 #include <linux/clk.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/suspend.h>
20 #include <linux/devfreq-event.h>
22 #include "exynos-ppmu.h"
24 enum exynos_ppmu_type {
29 struct exynos_ppmu_data {
34 struct devfreq_event_dev **edev;
35 struct devfreq_event_desc *desc;
36 unsigned int num_events;
39 struct regmap *regmap;
41 struct exynos_ppmu_data ppmu;
42 enum exynos_ppmu_type ppmu_type;
45 #define PPMU_EVENT(name) \
46 { "ppmu-event0-"#name, PPMU_PMNCNT0 }, \
47 { "ppmu-event1-"#name, PPMU_PMNCNT1 }, \
48 { "ppmu-event2-"#name, PPMU_PMNCNT2 }, \
49 { "ppmu-event3-"#name, PPMU_PMNCNT3 }
51 static struct __exynos_ppmu_events {
55 /* For Exynos3250, Exynos4 and Exynos5260 */
59 /* For Exynos4 SoCs and Exynos3250 */
68 /* Only for Exynos3250 and Exynos5260 */
71 /* Only for Exynos4 SoCs */
73 PPMU_EVENT(mfc-right),
75 /* Only for Exynos5260 SoCs */
89 /* Only for Exynos5433 SoCs */
91 PPMU_EVENT(d0-general),
94 PPMU_EVENT(d1-general),
97 /* For Exynos5422 SoC, deprecated (backwards compatible) */
102 /* For Exynos5422 SoC */
109 static int __exynos_ppmu_find_ppmu_id(const char *edev_name)
113 for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
114 if (!strcmp(edev_name, ppmu_events[i].name))
115 return ppmu_events[i].id;
120 static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
122 return __exynos_ppmu_find_ppmu_id(edev->desc->name);
126 * The devfreq-event ops structure for PPMU v1.1
128 static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
130 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
134 /* Disable all counters */
135 ret = regmap_write(info->regmap, PPMU_CNTENC,
145 ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
149 pmnc &= ~PPMU_PMNC_ENABLE_MASK;
150 ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
157 static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
159 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
160 int id = exynos_ppmu_find_ppmu_id(edev);
167 /* Enable specific counter */
168 ret = regmap_read(info->regmap, PPMU_CNTENS, &cntens);
172 cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
173 ret = regmap_write(info->regmap, PPMU_CNTENS, cntens);
177 /* Set the event of proper data type monitoring */
178 ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
179 edev->desc->event_type);
183 /* Reset cycle counter/performance counter and enable PPMU */
184 ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
188 pmnc &= ~(PPMU_PMNC_ENABLE_MASK
189 | PPMU_PMNC_COUNTER_RESET_MASK
190 | PPMU_PMNC_CC_RESET_MASK);
191 pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
192 pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
193 pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
194 ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
201 static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
202 struct devfreq_event_data *edata)
204 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
205 int id = exynos_ppmu_find_ppmu_id(edev);
206 unsigned int total_count, load_count;
207 unsigned int pmcnt3_high, pmcnt3_low;
208 unsigned int pmnc, cntenc;
215 ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
219 pmnc &= ~PPMU_PMNC_ENABLE_MASK;
220 ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
224 /* Read cycle count */
225 ret = regmap_read(info->regmap, PPMU_CCNT, &total_count);
228 edata->total_count = total_count;
230 /* Read performance count */
235 ret = regmap_read(info->regmap, PPMU_PMNCT(id), &load_count);
238 edata->load_count = load_count;
241 ret = regmap_read(info->regmap, PPMU_PMCNT3_HIGH, &pmcnt3_high);
245 ret = regmap_read(info->regmap, PPMU_PMCNT3_LOW, &pmcnt3_low);
249 edata->load_count = ((pmcnt3_high << 8) | pmcnt3_low);
255 /* Disable specific counter */
256 ret = regmap_read(info->regmap, PPMU_CNTENC, &cntenc);
260 cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
261 ret = regmap_write(info->regmap, PPMU_CNTENC, cntenc);
265 dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
266 edata->load_count, edata->total_count);
271 static const struct devfreq_event_ops exynos_ppmu_ops = {
272 .disable = exynos_ppmu_disable,
273 .set_event = exynos_ppmu_set_event,
274 .get_event = exynos_ppmu_get_event,
278 * The devfreq-event ops structure for PPMU v2.0
280 static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
282 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
286 /* Disable all counters */
287 clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
288 | PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
289 ret = regmap_write(info->regmap, PPMU_V2_FLAG, clear);
293 ret = regmap_write(info->regmap, PPMU_V2_INTENC, clear);
297 ret = regmap_write(info->regmap, PPMU_V2_CNTENC, clear);
301 ret = regmap_write(info->regmap, PPMU_V2_CNT_RESET, clear);
305 ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG0, 0x0);
309 ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG1, 0x0);
313 ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG2, 0x0);
317 ret = regmap_write(info->regmap, PPMU_V2_CIG_RESULT, 0x0);
321 ret = regmap_write(info->regmap, PPMU_V2_CNT_AUTO, 0x0);
325 ret = regmap_write(info->regmap, PPMU_V2_CH_EV0_TYPE, 0x0);
329 ret = regmap_write(info->regmap, PPMU_V2_CH_EV1_TYPE, 0x0);
333 ret = regmap_write(info->regmap, PPMU_V2_CH_EV2_TYPE, 0x0);
337 ret = regmap_write(info->regmap, PPMU_V2_CH_EV3_TYPE, 0x0);
341 ret = regmap_write(info->regmap, PPMU_V2_SM_ID_V, 0x0);
345 ret = regmap_write(info->regmap, PPMU_V2_SM_ID_A, 0x0);
349 ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_V, 0x0);
353 ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_A, 0x0);
357 ret = regmap_write(info->regmap, PPMU_V2_INTERRUPT_RESET, 0x0);
362 ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
366 pmnc &= ~PPMU_PMNC_ENABLE_MASK;
367 ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
374 static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
376 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
377 unsigned int pmnc, cntens;
378 int id = exynos_ppmu_find_ppmu_id(edev);
381 /* Enable all counters */
382 ret = regmap_read(info->regmap, PPMU_V2_CNTENS, &cntens);
386 cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
387 ret = regmap_write(info->regmap, PPMU_V2_CNTENS, cntens);
391 /* Set the event of proper data type monitoring */
392 ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
393 edev->desc->event_type);
397 /* Reset cycle counter/performance counter and enable PPMU */
398 ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
402 pmnc &= ~(PPMU_PMNC_ENABLE_MASK
403 | PPMU_PMNC_COUNTER_RESET_MASK
404 | PPMU_PMNC_CC_RESET_MASK
405 | PPMU_PMNC_CC_DIVIDER_MASK
406 | PPMU_V2_PMNC_START_MODE_MASK);
407 pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
408 pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
409 pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
410 pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
412 ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
419 static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
420 struct devfreq_event_data *edata)
422 struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
423 int id = exynos_ppmu_find_ppmu_id(edev);
425 unsigned int pmnc, cntenc;
426 unsigned int pmcnt_high, pmcnt_low;
427 unsigned int total_count, count;
428 unsigned long load_count = 0;
431 ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
435 pmnc &= ~PPMU_PMNC_ENABLE_MASK;
436 ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
440 /* Read cycle count and performance count */
441 ret = regmap_read(info->regmap, PPMU_V2_CCNT, &total_count);
444 edata->total_count = total_count;
450 ret = regmap_read(info->regmap, PPMU_V2_PMNCT(id), &count);
456 ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_HIGH,
461 ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_LOW, &pmcnt_low);
465 load_count = ((u64)((pmcnt_high & 0xff)) << 32)+ (u64)pmcnt_low;
468 edata->load_count = load_count;
470 /* Disable all counters */
471 ret = regmap_read(info->regmap, PPMU_V2_CNTENC, &cntenc);
475 cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
476 ret = regmap_write(info->regmap, PPMU_V2_CNTENC, cntenc);
480 dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
481 edata->load_count, edata->total_count);
485 static const struct devfreq_event_ops exynos_ppmu_v2_ops = {
486 .disable = exynos_ppmu_v2_disable,
487 .set_event = exynos_ppmu_v2_set_event,
488 .get_event = exynos_ppmu_v2_get_event,
491 static const struct of_device_id exynos_ppmu_id_match[] = {
493 .compatible = "samsung,exynos-ppmu",
494 .data = (void *)EXYNOS_TYPE_PPMU,
496 .compatible = "samsung,exynos-ppmu-v2",
497 .data = (void *)EXYNOS_TYPE_PPMU_V2,
501 MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
503 static int of_get_devfreq_events(struct device_node *np,
504 struct exynos_ppmu *info)
506 struct devfreq_event_desc *desc;
507 struct device *dev = info->dev;
508 struct device_node *events_np, *node;
510 const struct of_device_id *of_id;
513 events_np = of_get_child_by_name(np, "events");
516 "failed to get child node of devfreq-event devices\n");
520 count = of_get_child_count(events_np);
521 desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
524 info->num_events = count;
526 of_id = of_match_device(exynos_ppmu_id_match, dev);
528 info->ppmu_type = (enum exynos_ppmu_type)of_id->data;
533 for_each_child_of_node(events_np, node) {
534 for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
535 if (!ppmu_events[i].name)
538 if (of_node_name_eq(node, ppmu_events[i].name))
542 if (i == ARRAY_SIZE(ppmu_events)) {
544 "don't know how to configure events : %pOFn\n",
549 switch (info->ppmu_type) {
550 case EXYNOS_TYPE_PPMU:
551 desc[j].ops = &exynos_ppmu_ops;
553 case EXYNOS_TYPE_PPMU_V2:
554 desc[j].ops = &exynos_ppmu_v2_ops;
558 desc[j].driver_data = info;
560 of_property_read_string(node, "event-name", &desc[j].name);
561 ret = of_property_read_u32(node, "event-data-type",
562 &desc[j].event_type);
564 /* Set the event of proper data type counting.
565 * Check if the data type has been defined in DT,
566 * use default if not.
568 if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
569 /* Not all registers take the same value for
570 * read+write data count.
572 switch (ppmu_events[i].id) {
576 desc[j].event_type = PPMU_V2_RO_DATA_CNT
577 | PPMU_V2_WO_DATA_CNT;
581 PPMU_V2_EVT3_RW_DATA_CNT;
585 desc[j].event_type = PPMU_RO_DATA_CNT |
594 of_node_put(events_np);
599 static struct regmap_config exynos_ppmu_regmap_config = {
605 static int exynos_ppmu_parse_dt(struct platform_device *pdev,
606 struct exynos_ppmu *info)
608 struct device *dev = info->dev;
609 struct device_node *np = dev->of_node;
610 struct resource *res;
615 dev_err(dev, "failed to find devicetree node\n");
619 /* Maps the memory mapped IO to control PPMU register */
620 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
621 base = devm_ioremap_resource(dev, res);
623 return PTR_ERR(base);
625 exynos_ppmu_regmap_config.max_register = resource_size(res) - 4;
626 info->regmap = devm_regmap_init_mmio(dev, base,
627 &exynos_ppmu_regmap_config);
628 if (IS_ERR(info->regmap)) {
629 dev_err(dev, "failed to initialize regmap\n");
630 return PTR_ERR(info->regmap);
633 info->ppmu.clk = devm_clk_get(dev, "ppmu");
634 if (IS_ERR(info->ppmu.clk)) {
635 info->ppmu.clk = NULL;
636 dev_warn(dev, "cannot get PPMU clock\n");
639 ret = of_get_devfreq_events(np, info);
641 dev_err(dev, "failed to parse exynos ppmu dt node\n");
648 static int exynos_ppmu_probe(struct platform_device *pdev)
650 struct exynos_ppmu *info;
651 struct devfreq_event_dev **edev;
652 struct devfreq_event_desc *desc;
653 int i, ret = 0, size;
655 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
659 info->dev = &pdev->dev;
661 /* Parse dt data to get resource */
662 ret = exynos_ppmu_parse_dt(pdev, info);
665 "failed to parse devicetree for resource\n");
670 size = sizeof(struct devfreq_event_dev *) * info->num_events;
671 info->edev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
676 platform_set_drvdata(pdev, info);
678 for (i = 0; i < info->num_events; i++) {
679 edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
680 if (IS_ERR(edev[i])) {
682 "failed to add devfreq-event device\n");
683 return PTR_ERR(edev[i]);
686 pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
687 dev_name(&pdev->dev), desc[i].name);
690 ret = clk_prepare_enable(info->ppmu.clk);
692 dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
699 static int exynos_ppmu_remove(struct platform_device *pdev)
701 struct exynos_ppmu *info = platform_get_drvdata(pdev);
703 clk_disable_unprepare(info->ppmu.clk);
708 static struct platform_driver exynos_ppmu_driver = {
709 .probe = exynos_ppmu_probe,
710 .remove = exynos_ppmu_remove,
712 .name = "exynos-ppmu",
713 .of_match_table = exynos_ppmu_id_match,
716 module_platform_driver(exynos_ppmu_driver);
718 MODULE_DESCRIPTION("Exynos PPMU(Platform Performance Monitoring Unit) driver");
719 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
720 MODULE_LICENSE("GPL");