1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018 Linaro Limited, All rights reserved.
4 * Author: Mike Leach <mike.leach@linaro.org>
7 #include <linux/amba/bus.h>
8 #include <linux/atomic.h>
9 #include <linux/bits.h>
10 #include <linux/coresight.h>
11 #include <linux/cpu_pm.h>
12 #include <linux/cpuhotplug.h>
13 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/property.h>
20 #include <linux/spinlock.h>
22 #include "coresight-priv.h"
23 #include "coresight-cti.h"
26 * CTI devices can be associated with a PE, or be connected to CoreSight
27 * hardware. We have a list of all CTIs irrespective of CPU bound or
30 * We assume that the non-CPU CTIs are always powered as we do with sinks etc.
32 * We leave the client to figure out if all the CTIs are interconnected with
33 * the same CTM, in general this is the case but does not always have to be.
36 /* net of CTI devices connected via CTM */
37 static LIST_HEAD(ect_net);
39 /* protect the list */
40 static DEFINE_MUTEX(ect_mutex);
42 #define csdev_to_cti_drvdata(csdev) \
43 dev_get_drvdata(csdev->dev.parent)
45 /* power management handling */
46 static int nr_cti_cpu;
48 /* quick lookup list for CPU bound CTIs when power handling */
49 static struct cti_drvdata *cti_cpu_drvdata[NR_CPUS];
52 * CTI naming. CTI bound to cores will have the name cti_cpu<N> where
53 * N is the CPU ID. System CTIs will have the name cti_sys<I> where I
54 * is an index allocated by order of discovery.
56 * CTI device name list - for CTI not bound to cores.
58 DEFINE_CORESIGHT_DEVLIST(cti_sys_devs, "cti_sys");
60 /* write set of regs to hardware - call with spinlock claimed */
61 void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
63 struct cti_config *config = &drvdata->config;
66 CS_UNLOCK(drvdata->base);
68 /* disable CTI before writing registers */
69 writel_relaxed(0, drvdata->base + CTICONTROL);
71 /* write the CTI trigger registers */
72 for (i = 0; i < config->nr_trig_max; i++) {
73 writel_relaxed(config->ctiinen[i], drvdata->base + CTIINEN(i));
74 writel_relaxed(config->ctiouten[i],
75 drvdata->base + CTIOUTEN(i));
79 writel_relaxed(config->ctigate, drvdata->base + CTIGATE);
80 writel_relaxed(config->asicctl, drvdata->base + ASICCTL);
81 writel_relaxed(config->ctiappset, drvdata->base + CTIAPPSET);
84 writel_relaxed(1, drvdata->base + CTICONTROL);
86 CS_LOCK(drvdata->base);
89 /* write regs to hardware and enable */
90 static int cti_enable_hw(struct cti_drvdata *drvdata)
92 struct cti_config *config = &drvdata->config;
96 spin_lock_irqsave(&drvdata->spinlock, flags);
98 /* no need to do anything if enabled or unpowered*/
99 if (config->hw_enabled || !config->hw_powered)
100 goto cti_state_unchanged;
102 /* claim the device */
103 rc = coresight_claim_device(drvdata->csdev);
105 goto cti_err_not_enabled;
107 cti_write_all_hw_regs(drvdata);
109 config->hw_enabled = true;
110 drvdata->config.enable_req_count++;
111 spin_unlock_irqrestore(&drvdata->spinlock, flags);
115 drvdata->config.enable_req_count++;
117 /* cannot enable due to error */
119 spin_unlock_irqrestore(&drvdata->spinlock, flags);
123 /* re-enable CTI on CPU when using CPU hotplug */
124 static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
126 struct cti_config *config = &drvdata->config;
128 spin_lock(&drvdata->spinlock);
129 config->hw_powered = true;
131 /* no need to do anything if no enable request */
132 if (!drvdata->config.enable_req_count)
133 goto cti_hp_not_enabled;
135 /* try to claim the device */
136 if (coresight_claim_device(drvdata->csdev))
137 goto cti_hp_not_enabled;
139 cti_write_all_hw_regs(drvdata);
140 config->hw_enabled = true;
141 spin_unlock(&drvdata->spinlock);
144 /* did not re-enable due to no claim / no request */
146 spin_unlock(&drvdata->spinlock);
149 /* disable hardware */
150 static int cti_disable_hw(struct cti_drvdata *drvdata)
152 struct cti_config *config = &drvdata->config;
153 struct coresight_device *csdev = drvdata->csdev;
156 spin_lock(&drvdata->spinlock);
158 /* don't allow negative refcounts, return an error */
159 if (!drvdata->config.enable_req_count) {
161 goto cti_not_disabled;
164 /* check refcount - disable on 0 */
165 if (--drvdata->config.enable_req_count > 0)
166 goto cti_not_disabled;
168 /* no need to do anything if disabled or cpu unpowered */
169 if (!config->hw_enabled || !config->hw_powered)
170 goto cti_not_disabled;
172 CS_UNLOCK(drvdata->base);
175 writel_relaxed(0, drvdata->base + CTICONTROL);
176 config->hw_enabled = false;
178 coresight_disclaim_device_unlocked(csdev);
179 CS_LOCK(drvdata->base);
180 spin_unlock(&drvdata->spinlock);
183 /* not disabled this call */
185 spin_unlock(&drvdata->spinlock);
189 void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value)
191 CS_UNLOCK(drvdata->base);
192 writel_relaxed(value, drvdata->base + offset);
193 CS_LOCK(drvdata->base);
196 void cti_write_intack(struct device *dev, u32 ackval)
198 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
199 struct cti_config *config = &drvdata->config;
201 spin_lock(&drvdata->spinlock);
202 /* write if enabled */
203 if (cti_active(config))
204 cti_write_single_reg(drvdata, CTIINTACK, ackval);
205 spin_unlock(&drvdata->spinlock);
209 * Look at the HW DEVID register for some of the HW settings.
210 * DEVID[15:8] - max number of in / out triggers.
212 #define CTI_DEVID_MAXTRIGS(devid_val) ((int) BMVAL(devid_val, 8, 15))
214 /* DEVID[19:16] - number of CTM channels */
215 #define CTI_DEVID_CTMCHANNELS(devid_val) ((int) BMVAL(devid_val, 16, 19))
217 static void cti_set_default_config(struct device *dev,
218 struct cti_drvdata *drvdata)
220 struct cti_config *config = &drvdata->config;
223 devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
224 config->nr_trig_max = CTI_DEVID_MAXTRIGS(devid);
227 * no current hardware should exceed this, but protect the driver
228 * in case of fault / out of spec hw
230 if (config->nr_trig_max > CTIINOUTEN_MAX) {
232 "Limiting HW MaxTrig value(%d) to driver max(%d)\n",
233 config->nr_trig_max, CTIINOUTEN_MAX);
234 config->nr_trig_max = CTIINOUTEN_MAX;
237 config->nr_ctm_channels = CTI_DEVID_CTMCHANNELS(devid);
239 /* Most regs default to 0 as zalloc'ed except...*/
240 config->trig_filter_enable = true;
241 config->ctigate = GENMASK(config->nr_ctm_channels - 1, 0);
242 config->enable_req_count = 0;
246 * Add a connection entry to the list of connections for this
249 int cti_add_connection_entry(struct device *dev, struct cti_drvdata *drvdata,
250 struct cti_trig_con *tc,
251 struct coresight_device *csdev,
252 const char *assoc_dev_name)
254 struct cti_device *cti_dev = &drvdata->ctidev;
258 * Prefer actual associated CS device dev name to supplied value -
259 * which is likely to be node name / other conn name.
262 tc->con_dev_name = dev_name(&csdev->dev);
263 else if (assoc_dev_name != NULL) {
264 tc->con_dev_name = devm_kstrdup(dev,
265 assoc_dev_name, GFP_KERNEL);
266 if (!tc->con_dev_name)
269 list_add_tail(&tc->node, &cti_dev->trig_cons);
270 cti_dev->nr_trig_con++;
272 /* add connection usage bit info to overall info */
273 drvdata->config.trig_in_use |= tc->con_in->used_mask;
274 drvdata->config.trig_out_use |= tc->con_out->used_mask;
279 /* create a trigger connection with appropriately sized signal groups */
280 struct cti_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs,
283 struct cti_trig_con *tc = NULL;
284 struct cti_trig_grp *in = NULL, *out = NULL;
286 tc = devm_kzalloc(dev, sizeof(struct cti_trig_con), GFP_KERNEL);
290 in = devm_kzalloc(dev,
291 offsetof(struct cti_trig_grp, sig_types[in_sigs]),
296 out = devm_kzalloc(dev,
297 offsetof(struct cti_trig_grp, sig_types[out_sigs]),
304 tc->con_in->nr_sigs = in_sigs;
305 tc->con_out->nr_sigs = out_sigs;
310 * Add a default connection if nothing else is specified.
311 * single connection based on max in/out info, no assoc device
313 int cti_add_default_connection(struct device *dev, struct cti_drvdata *drvdata)
316 int n_trigs = drvdata->config.nr_trig_max;
317 u32 n_trig_mask = GENMASK(n_trigs - 1, 0);
318 struct cti_trig_con *tc = NULL;
321 * Assume max trigs for in and out,
322 * all used, default sig types allocated
324 tc = cti_allocate_trig_con(dev, n_trigs, n_trigs);
328 tc->con_in->used_mask = n_trig_mask;
329 tc->con_out->used_mask = n_trig_mask;
330 ret = cti_add_connection_entry(dev, drvdata, tc, NULL, "default");
334 /** cti channel api **/
335 /* attach/detach channel from trigger - write through if enabled. */
336 int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
337 enum cti_trig_dir direction, u32 channel_idx,
340 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
341 struct cti_config *config = &drvdata->config;
347 /* ensure indexes in range */
348 if ((channel_idx >= config->nr_ctm_channels) ||
349 (trigger_idx >= config->nr_trig_max))
352 trig_bitmask = BIT(trigger_idx);
354 /* ensure registered triggers and not out filtered */
355 if (direction == CTI_TRIG_IN) {
356 if (!(trig_bitmask & config->trig_in_use))
359 if (!(trig_bitmask & config->trig_out_use))
362 if ((config->trig_filter_enable) &&
363 (config->trig_out_filter & trig_bitmask))
367 /* update the local register values */
368 chan_bitmask = BIT(channel_idx);
369 reg_offset = (direction == CTI_TRIG_IN ? CTIINEN(trigger_idx) :
370 CTIOUTEN(trigger_idx));
372 spin_lock(&drvdata->spinlock);
374 /* read - modify write - the trigger / channel enable value */
375 reg_value = direction == CTI_TRIG_IN ? config->ctiinen[trigger_idx] :
376 config->ctiouten[trigger_idx];
377 if (op == CTI_CHAN_ATTACH)
378 reg_value |= chan_bitmask;
380 reg_value &= ~chan_bitmask;
382 /* write local copy */
383 if (direction == CTI_TRIG_IN)
384 config->ctiinen[trigger_idx] = reg_value;
386 config->ctiouten[trigger_idx] = reg_value;
388 /* write through if enabled */
389 if (cti_active(config))
390 cti_write_single_reg(drvdata, reg_offset, reg_value);
391 spin_unlock(&drvdata->spinlock);
395 int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
398 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
399 struct cti_config *config = &drvdata->config;
404 if (channel_idx >= config->nr_ctm_channels)
407 chan_bitmask = BIT(channel_idx);
409 spin_lock(&drvdata->spinlock);
410 reg_value = config->ctigate;
412 case CTI_GATE_CHAN_ENABLE:
413 reg_value |= chan_bitmask;
416 case CTI_GATE_CHAN_DISABLE:
417 reg_value &= ~chan_bitmask;
425 config->ctigate = reg_value;
426 if (cti_active(config))
427 cti_write_single_reg(drvdata, CTIGATE, reg_value);
429 spin_unlock(&drvdata->spinlock);
433 int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
436 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
437 struct cti_config *config = &drvdata->config;
443 if (channel_idx >= config->nr_ctm_channels)
446 chan_bitmask = BIT(channel_idx);
448 spin_lock(&drvdata->spinlock);
449 reg_value = config->ctiappset;
452 config->ctiappset |= chan_bitmask;
453 reg_value = config->ctiappset;
454 reg_offset = CTIAPPSET;
458 config->ctiappset &= ~chan_bitmask;
459 reg_value = chan_bitmask;
460 reg_offset = CTIAPPCLEAR;
464 config->ctiappset &= ~chan_bitmask;
465 reg_value = chan_bitmask;
466 reg_offset = CTIAPPPULSE;
474 if ((err == 0) && cti_active(config))
475 cti_write_single_reg(drvdata, reg_offset, reg_value);
476 spin_unlock(&drvdata->spinlock);
481 static bool cti_add_sysfs_link(struct cti_drvdata *drvdata,
482 struct cti_trig_con *tc)
484 struct coresight_sysfs_link link_info;
487 link_info.orig = drvdata->csdev;
488 link_info.orig_name = tc->con_dev_name;
489 link_info.target = tc->con_dev;
490 link_info.target_name = dev_name(&drvdata->csdev->dev);
492 link_err = coresight_add_sysfs_link(&link_info);
494 dev_warn(&drvdata->csdev->dev,
495 "Failed to set CTI sysfs link %s<=>%s\n",
496 link_info.orig_name, link_info.target_name);
500 static void cti_remove_sysfs_link(struct cti_drvdata *drvdata,
501 struct cti_trig_con *tc)
503 struct coresight_sysfs_link link_info;
505 link_info.orig = drvdata->csdev;
506 link_info.orig_name = tc->con_dev_name;
507 link_info.target = tc->con_dev;
508 link_info.target_name = dev_name(&drvdata->csdev->dev);
509 coresight_remove_sysfs_link(&link_info);
513 * Look for a matching connection device name in the list of connections.
514 * If found then swap in the csdev name, set trig con association pointer
518 cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name,
519 struct coresight_device *csdev)
521 struct cti_trig_con *tc;
522 struct cti_drvdata *drvdata = container_of(ctidev, struct cti_drvdata,
525 list_for_each_entry(tc, &ctidev->trig_cons, node) {
526 if (tc->con_dev_name) {
527 if (!strcmp(node_name, tc->con_dev_name)) {
528 /* match: so swap in csdev name & dev */
529 tc->con_dev_name = dev_name(&csdev->dev);
531 /* try to set sysfs link */
532 if (cti_add_sysfs_link(drvdata, tc))
534 /* link failed - remove CTI reference */
544 * Search the cti list to add an associated CTI into the supplied CS device
545 * This will set the association if CTI declared before the CS device.
546 * (called from coresight_register() without coresight_mutex locked).
548 static void cti_add_assoc_to_csdev(struct coresight_device *csdev)
550 struct cti_drvdata *ect_item;
551 struct cti_device *ctidev;
552 const char *node_name = NULL;
554 /* protect the list */
555 mutex_lock(&ect_mutex);
557 /* exit if current is an ECT device.*/
558 if ((csdev->type == CORESIGHT_DEV_TYPE_HELPER &&
559 csdev->subtype.helper_subtype ==
560 CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI) ||
561 list_empty(&ect_net))
564 /* if we didn't find the csdev previously we used the fwnode name */
565 node_name = cti_plat_get_node_name(dev_fwnode(csdev->dev.parent));
569 /* for each CTI in list... */
570 list_for_each_entry(ect_item, &ect_net, node) {
571 ctidev = &ect_item->ctidev;
572 if (cti_match_fixup_csdev(ctidev, node_name, csdev)) {
574 * if we found a matching csdev then update the ECT
575 * association pointer for the device with this CTI.
577 coresight_add_helper(csdev, ect_item->csdev);
582 mutex_unlock(&ect_mutex);
586 * Removing the associated devices is easier.
588 static void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
590 struct cti_drvdata *ctidrv;
591 struct cti_trig_con *tc;
592 struct cti_device *ctidev;
593 union coresight_dev_subtype cti_subtype = {
594 .helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI
596 struct coresight_device *cti_csdev = coresight_find_output_type(
597 csdev->pdata, CORESIGHT_DEV_TYPE_HELPER, cti_subtype);
602 mutex_lock(&ect_mutex);
603 ctidrv = csdev_to_cti_drvdata(cti_csdev);
604 ctidev = &ctidrv->ctidev;
605 list_for_each_entry(tc, &ctidev->trig_cons, node) {
606 if (tc->con_dev == csdev) {
607 cti_remove_sysfs_link(ctidrv, tc);
612 mutex_unlock(&ect_mutex);
616 * Operations to add and remove associated CTI.
617 * Register to coresight core driver as call back function.
619 static struct cti_assoc_op cti_assoc_ops = {
620 .add = cti_add_assoc_to_csdev,
621 .remove = cti_remove_assoc_from_csdev
625 * Update the cross references where the associated device was found
626 * while we were building the connection info. This will occur if the
627 * assoc device was registered before the CTI.
629 static void cti_update_conn_xrefs(struct cti_drvdata *drvdata)
631 struct cti_trig_con *tc;
632 struct cti_device *ctidev = &drvdata->ctidev;
634 list_for_each_entry(tc, &ctidev->trig_cons, node) {
636 /* if we can set the sysfs link */
637 if (cti_add_sysfs_link(drvdata, tc))
638 /* set the CTI/csdev association */
639 coresight_add_helper(tc->con_dev,
642 /* otherwise remove reference from CTI */
648 static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata)
650 struct cti_trig_con *tc;
651 struct cti_device *ctidev = &drvdata->ctidev;
653 list_for_each_entry(tc, &ctidev->trig_cons, node) {
655 cti_remove_sysfs_link(drvdata, tc);
661 /** cti PM callbacks **/
662 static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
665 struct cti_drvdata *drvdata;
666 struct coresight_device *csdev;
667 unsigned int cpu = smp_processor_id();
668 int notify_res = NOTIFY_OK;
670 if (!cti_cpu_drvdata[cpu])
673 drvdata = cti_cpu_drvdata[cpu];
674 csdev = drvdata->csdev;
676 if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
679 spin_lock(&drvdata->spinlock);
683 /* CTI regs all static - we have a copy & nothing to save */
684 drvdata->config.hw_powered = false;
685 if (drvdata->config.hw_enabled)
686 coresight_disclaim_device(csdev);
689 case CPU_PM_ENTER_FAILED:
690 drvdata->config.hw_powered = true;
691 if (drvdata->config.hw_enabled) {
692 if (coresight_claim_device(csdev))
693 drvdata->config.hw_enabled = false;
698 /* write hardware registers to re-enable. */
699 drvdata->config.hw_powered = true;
700 drvdata->config.hw_enabled = false;
702 /* check enable reference count to enable HW */
703 if (drvdata->config.enable_req_count) {
704 /* check we can claim the device as we re-power */
705 if (coresight_claim_device(csdev))
706 goto cti_notify_exit;
708 drvdata->config.hw_enabled = true;
709 cti_write_all_hw_regs(drvdata);
714 notify_res = NOTIFY_DONE;
719 spin_unlock(&drvdata->spinlock);
723 static struct notifier_block cti_cpu_pm_nb = {
724 .notifier_call = cti_cpu_pm_notify,
727 /* CPU HP handlers */
728 static int cti_starting_cpu(unsigned int cpu)
730 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
735 cti_cpuhp_enable_hw(drvdata);
739 static int cti_dying_cpu(unsigned int cpu)
741 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
746 spin_lock(&drvdata->spinlock);
747 drvdata->config.hw_powered = false;
748 if (drvdata->config.hw_enabled)
749 coresight_disclaim_device(drvdata->csdev);
750 spin_unlock(&drvdata->spinlock);
754 static int cti_pm_setup(struct cti_drvdata *drvdata)
758 if (drvdata->ctidev.cpu == -1)
765 ret = cpuhp_setup_state_nocalls_cpuslocked(
766 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
767 "arm/coresight_cti:starting",
768 cti_starting_cpu, cti_dying_cpu);
774 ret = cpu_pm_register_notifier(&cti_cpu_pm_nb);
777 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
783 cti_cpu_drvdata[drvdata->ctidev.cpu] = drvdata;
788 /* release PM registrations */
789 static void cti_pm_release(struct cti_drvdata *drvdata)
791 if (drvdata->ctidev.cpu == -1)
794 cti_cpu_drvdata[drvdata->ctidev.cpu] = NULL;
795 if (--nr_cti_cpu == 0) {
796 cpu_pm_unregister_notifier(&cti_cpu_pm_nb);
797 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
801 /** cti ect operations **/
802 int cti_enable(struct coresight_device *csdev, enum cs_mode mode, void *data)
804 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
806 return cti_enable_hw(drvdata);
809 int cti_disable(struct coresight_device *csdev, void *data)
811 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
813 return cti_disable_hw(drvdata);
816 static const struct coresight_ops_helper cti_ops_ect = {
817 .enable = cti_enable,
818 .disable = cti_disable,
821 static const struct coresight_ops cti_ops = {
822 .helper_ops = &cti_ops_ect,
826 * Free up CTI specific resources
827 * called by dev->release, need to call down to underlying csdev release.
829 static void cti_device_release(struct device *dev)
831 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
832 struct cti_drvdata *ect_item, *ect_tmp;
834 mutex_lock(&ect_mutex);
835 cti_pm_release(drvdata);
837 /* remove from the list */
838 list_for_each_entry_safe(ect_item, ect_tmp, &ect_net, node) {
839 if (ect_item == drvdata) {
840 list_del(&ect_item->node);
844 mutex_unlock(&ect_mutex);
846 if (drvdata->csdev_release)
847 drvdata->csdev_release(dev);
849 static void cti_remove(struct amba_device *adev)
851 struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev);
853 mutex_lock(&ect_mutex);
854 cti_remove_conn_xrefs(drvdata);
855 mutex_unlock(&ect_mutex);
857 coresight_unregister(drvdata->csdev);
860 static int cti_probe(struct amba_device *adev, const struct amba_id *id)
864 struct device *dev = &adev->dev;
865 struct cti_drvdata *drvdata = NULL;
866 struct coresight_desc cti_desc;
867 struct coresight_platform_data *pdata = NULL;
868 struct resource *res = &adev->res;
871 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
875 /* Validity for the resource is already checked by the AMBA core */
876 base = devm_ioremap_resource(dev, res);
878 return PTR_ERR(base);
880 drvdata->base = base;
881 cti_desc.access = CSDEV_ACCESS_IOMEM(base);
883 dev_set_drvdata(dev, drvdata);
885 /* default CTI device info */
886 drvdata->ctidev.cpu = -1;
887 drvdata->ctidev.nr_trig_con = 0;
888 drvdata->ctidev.ctm_id = 0;
889 INIT_LIST_HEAD(&drvdata->ctidev.trig_cons);
891 spin_lock_init(&drvdata->spinlock);
893 /* initialise CTI driver config values */
894 cti_set_default_config(dev, drvdata);
896 pdata = coresight_cti_get_platform_data(dev);
898 dev_err(dev, "coresight_cti_get_platform_data err\n");
899 return PTR_ERR(pdata);
902 /* default to powered - could change on PM notifications */
903 drvdata->config.hw_powered = true;
905 /* set up device name - will depend if cpu bound or otherwise */
906 if (drvdata->ctidev.cpu >= 0)
907 cti_desc.name = devm_kasprintf(dev, GFP_KERNEL, "cti_cpu%d",
908 drvdata->ctidev.cpu);
910 cti_desc.name = coresight_alloc_device_name(&cti_sys_devs, dev);
914 /* setup CPU power management handling for CPU bound CTI devices. */
915 ret = cti_pm_setup(drvdata);
919 /* create dynamic attributes for connections */
920 ret = cti_create_cons_sysfs(dev, drvdata);
922 dev_err(dev, "%s: create dynamic sysfs entries failed\n",
927 /* set up coresight component description */
928 cti_desc.pdata = pdata;
929 cti_desc.type = CORESIGHT_DEV_TYPE_HELPER;
930 cti_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI;
931 cti_desc.ops = &cti_ops;
932 cti_desc.groups = drvdata->ctidev.con_groups;
934 drvdata->csdev = coresight_register(&cti_desc);
935 if (IS_ERR(drvdata->csdev)) {
936 ret = PTR_ERR(drvdata->csdev);
940 /* add to list of CTI devices */
941 mutex_lock(&ect_mutex);
942 list_add(&drvdata->node, &ect_net);
943 /* set any cross references */
944 cti_update_conn_xrefs(drvdata);
945 mutex_unlock(&ect_mutex);
947 /* set up release chain */
948 drvdata->csdev_release = drvdata->csdev->dev.release;
949 drvdata->csdev->dev.release = cti_device_release;
951 /* all done - dec pm refcount */
952 pm_runtime_put(&adev->dev);
953 dev_info(&drvdata->csdev->dev, "CTI initialized\n");
957 cti_pm_release(drvdata);
961 static struct amba_cs_uci_id uci_id_cti[] = {
964 .devarch = 0x47701a14, /* CTI v2 */
965 .devarch_mask = 0xfff0ffff,
966 .devtype = 0x00000014, /* maj(0x4-debug) min(0x1-ECT) */
970 static const struct amba_id cti_ids[] = {
971 CS_AMBA_ID(0x000bb906), /* Coresight CTI (SoC 400), C-A72, C-A57 */
972 CS_AMBA_ID(0x000bb922), /* CTI - C-A8 */
973 CS_AMBA_ID(0x000bb9a8), /* CTI - C-A53 */
974 CS_AMBA_ID(0x000bb9aa), /* CTI - C-A73 */
975 CS_AMBA_UCI_ID(0x000bb9da, uci_id_cti), /* CTI - C-A35 */
976 CS_AMBA_UCI_ID(0x000bb9ed, uci_id_cti), /* Coresight CTI (SoC 600) */
980 MODULE_DEVICE_TABLE(amba, cti_ids);
982 static struct amba_driver cti_driver = {
984 .name = "coresight-cti",
985 .owner = THIS_MODULE,
986 .suppress_bind_attrs = true,
989 .remove = cti_remove,
993 static int __init cti_init(void)
997 ret = amba_driver_register(&cti_driver);
999 pr_info("Error registering cti driver\n");
1000 coresight_set_cti_ops(&cti_assoc_ops);
1004 static void __exit cti_exit(void)
1006 coresight_remove_cti_ops();
1007 amba_driver_unregister(&cti_driver);
1010 module_init(cti_init);
1011 module_exit(cti_exit);
1013 MODULE_AUTHOR("Mike Leach <mike.leach@linaro.org>");
1014 MODULE_DESCRIPTION("Arm CoreSight CTI Driver");
1015 MODULE_LICENSE("GPL v2");