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;
93 struct device *dev = &drvdata->csdev->dev;
97 pm_runtime_get_sync(dev->parent);
98 spin_lock_irqsave(&drvdata->spinlock, flags);
100 /* no need to do anything if enabled or unpowered*/
101 if (config->hw_enabled || !config->hw_powered)
102 goto cti_state_unchanged;
104 /* claim the device */
105 rc = coresight_claim_device(drvdata->base);
107 goto cti_err_not_enabled;
109 cti_write_all_hw_regs(drvdata);
111 config->hw_enabled = true;
112 atomic_inc(&drvdata->config.enable_req_count);
113 spin_unlock_irqrestore(&drvdata->spinlock, flags);
117 atomic_inc(&drvdata->config.enable_req_count);
119 /* cannot enable due to error */
121 spin_unlock_irqrestore(&drvdata->spinlock, flags);
122 pm_runtime_put(dev->parent);
126 /* re-enable CTI on CPU when using CPU hotplug */
127 static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
129 struct cti_config *config = &drvdata->config;
131 spin_lock(&drvdata->spinlock);
132 config->hw_powered = true;
134 /* no need to do anything if no enable request */
135 if (!atomic_read(&drvdata->config.enable_req_count))
136 goto cti_hp_not_enabled;
138 /* try to claim the device */
139 if (coresight_claim_device(drvdata->base))
140 goto cti_hp_not_enabled;
142 cti_write_all_hw_regs(drvdata);
143 config->hw_enabled = true;
144 spin_unlock(&drvdata->spinlock);
147 /* did not re-enable due to no claim / no request */
149 spin_unlock(&drvdata->spinlock);
152 /* disable hardware */
153 static int cti_disable_hw(struct cti_drvdata *drvdata)
155 struct cti_config *config = &drvdata->config;
156 struct device *dev = &drvdata->csdev->dev;
158 spin_lock(&drvdata->spinlock);
160 /* check refcount - disable on 0 */
161 if (atomic_dec_return(&drvdata->config.enable_req_count) > 0)
162 goto cti_not_disabled;
164 /* no need to do anything if disabled or cpu unpowered */
165 if (!config->hw_enabled || !config->hw_powered)
166 goto cti_not_disabled;
168 CS_UNLOCK(drvdata->base);
171 writel_relaxed(0, drvdata->base + CTICONTROL);
172 config->hw_enabled = false;
174 coresight_disclaim_device_unlocked(drvdata->base);
175 CS_LOCK(drvdata->base);
176 spin_unlock(&drvdata->spinlock);
177 pm_runtime_put(dev->parent);
180 /* not disabled this call */
182 spin_unlock(&drvdata->spinlock);
186 void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value)
188 CS_UNLOCK(drvdata->base);
189 writel_relaxed(value, drvdata->base + offset);
190 CS_LOCK(drvdata->base);
193 void cti_write_intack(struct device *dev, u32 ackval)
195 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
196 struct cti_config *config = &drvdata->config;
198 spin_lock(&drvdata->spinlock);
199 /* write if enabled */
200 if (cti_active(config))
201 cti_write_single_reg(drvdata, CTIINTACK, ackval);
202 spin_unlock(&drvdata->spinlock);
206 * Look at the HW DEVID register for some of the HW settings.
207 * DEVID[15:8] - max number of in / out triggers.
209 #define CTI_DEVID_MAXTRIGS(devid_val) ((int) BMVAL(devid_val, 8, 15))
211 /* DEVID[19:16] - number of CTM channels */
212 #define CTI_DEVID_CTMCHANNELS(devid_val) ((int) BMVAL(devid_val, 16, 19))
214 static void cti_set_default_config(struct device *dev,
215 struct cti_drvdata *drvdata)
217 struct cti_config *config = &drvdata->config;
220 devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
221 config->nr_trig_max = CTI_DEVID_MAXTRIGS(devid);
224 * no current hardware should exceed this, but protect the driver
225 * in case of fault / out of spec hw
227 if (config->nr_trig_max > CTIINOUTEN_MAX) {
229 "Limiting HW MaxTrig value(%d) to driver max(%d)\n",
230 config->nr_trig_max, CTIINOUTEN_MAX);
231 config->nr_trig_max = CTIINOUTEN_MAX;
234 config->nr_ctm_channels = CTI_DEVID_CTMCHANNELS(devid);
236 /* Most regs default to 0 as zalloc'ed except...*/
237 config->trig_filter_enable = true;
238 config->ctigate = GENMASK(config->nr_ctm_channels - 1, 0);
239 atomic_set(&config->enable_req_count, 0);
243 * Add a connection entry to the list of connections for this
246 int cti_add_connection_entry(struct device *dev, struct cti_drvdata *drvdata,
247 struct cti_trig_con *tc,
248 struct coresight_device *csdev,
249 const char *assoc_dev_name)
251 struct cti_device *cti_dev = &drvdata->ctidev;
255 * Prefer actual associated CS device dev name to supplied value -
256 * which is likely to be node name / other conn name.
259 tc->con_dev_name = dev_name(&csdev->dev);
260 else if (assoc_dev_name != NULL) {
261 tc->con_dev_name = devm_kstrdup(dev,
262 assoc_dev_name, GFP_KERNEL);
263 if (!tc->con_dev_name)
266 list_add_tail(&tc->node, &cti_dev->trig_cons);
267 cti_dev->nr_trig_con++;
269 /* add connection usage bit info to overall info */
270 drvdata->config.trig_in_use |= tc->con_in->used_mask;
271 drvdata->config.trig_out_use |= tc->con_out->used_mask;
276 /* create a trigger connection with appropriately sized signal groups */
277 struct cti_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs,
280 struct cti_trig_con *tc = NULL;
281 struct cti_trig_grp *in = NULL, *out = NULL;
283 tc = devm_kzalloc(dev, sizeof(struct cti_trig_con), GFP_KERNEL);
287 in = devm_kzalloc(dev,
288 offsetof(struct cti_trig_grp, sig_types[in_sigs]),
293 out = devm_kzalloc(dev,
294 offsetof(struct cti_trig_grp, sig_types[out_sigs]),
301 tc->con_in->nr_sigs = in_sigs;
302 tc->con_out->nr_sigs = out_sigs;
307 * Add a default connection if nothing else is specified.
308 * single connection based on max in/out info, no assoc device
310 int cti_add_default_connection(struct device *dev, struct cti_drvdata *drvdata)
313 int n_trigs = drvdata->config.nr_trig_max;
314 u32 n_trig_mask = GENMASK(n_trigs - 1, 0);
315 struct cti_trig_con *tc = NULL;
318 * Assume max trigs for in and out,
319 * all used, default sig types allocated
321 tc = cti_allocate_trig_con(dev, n_trigs, n_trigs);
325 tc->con_in->used_mask = n_trig_mask;
326 tc->con_out->used_mask = n_trig_mask;
327 ret = cti_add_connection_entry(dev, drvdata, tc, NULL, "default");
331 /** cti channel api **/
332 /* attach/detach channel from trigger - write through if enabled. */
333 int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
334 enum cti_trig_dir direction, u32 channel_idx,
337 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
338 struct cti_config *config = &drvdata->config;
344 /* ensure indexes in range */
345 if ((channel_idx >= config->nr_ctm_channels) ||
346 (trigger_idx >= config->nr_trig_max))
349 trig_bitmask = BIT(trigger_idx);
351 /* ensure registered triggers and not out filtered */
352 if (direction == CTI_TRIG_IN) {
353 if (!(trig_bitmask & config->trig_in_use))
356 if (!(trig_bitmask & config->trig_out_use))
359 if ((config->trig_filter_enable) &&
360 (config->trig_out_filter & trig_bitmask))
364 /* update the local register values */
365 chan_bitmask = BIT(channel_idx);
366 reg_offset = (direction == CTI_TRIG_IN ? CTIINEN(trigger_idx) :
367 CTIOUTEN(trigger_idx));
369 spin_lock(&drvdata->spinlock);
371 /* read - modify write - the trigger / channel enable value */
372 reg_value = direction == CTI_TRIG_IN ? config->ctiinen[trigger_idx] :
373 config->ctiouten[trigger_idx];
374 if (op == CTI_CHAN_ATTACH)
375 reg_value |= chan_bitmask;
377 reg_value &= ~chan_bitmask;
379 /* write local copy */
380 if (direction == CTI_TRIG_IN)
381 config->ctiinen[trigger_idx] = reg_value;
383 config->ctiouten[trigger_idx] = reg_value;
385 /* write through if enabled */
386 if (cti_active(config))
387 cti_write_single_reg(drvdata, reg_offset, reg_value);
388 spin_unlock(&drvdata->spinlock);
392 int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
395 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
396 struct cti_config *config = &drvdata->config;
401 if (channel_idx >= config->nr_ctm_channels)
404 chan_bitmask = BIT(channel_idx);
406 spin_lock(&drvdata->spinlock);
407 reg_value = config->ctigate;
409 case CTI_GATE_CHAN_ENABLE:
410 reg_value |= chan_bitmask;
413 case CTI_GATE_CHAN_DISABLE:
414 reg_value &= ~chan_bitmask;
422 config->ctigate = reg_value;
423 if (cti_active(config))
424 cti_write_single_reg(drvdata, CTIGATE, reg_value);
426 spin_unlock(&drvdata->spinlock);
430 int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
433 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
434 struct cti_config *config = &drvdata->config;
440 if (channel_idx >= config->nr_ctm_channels)
443 chan_bitmask = BIT(channel_idx);
445 spin_lock(&drvdata->spinlock);
446 reg_value = config->ctiappset;
449 config->ctiappset |= chan_bitmask;
450 reg_value = config->ctiappset;
451 reg_offset = CTIAPPSET;
455 config->ctiappset &= ~chan_bitmask;
456 reg_value = chan_bitmask;
457 reg_offset = CTIAPPCLEAR;
461 config->ctiappset &= ~chan_bitmask;
462 reg_value = chan_bitmask;
463 reg_offset = CTIAPPPULSE;
471 if ((err == 0) && cti_active(config))
472 cti_write_single_reg(drvdata, reg_offset, reg_value);
473 spin_unlock(&drvdata->spinlock);
478 static bool cti_add_sysfs_link(struct cti_drvdata *drvdata,
479 struct cti_trig_con *tc)
481 struct coresight_sysfs_link link_info;
484 link_info.orig = drvdata->csdev;
485 link_info.orig_name = tc->con_dev_name;
486 link_info.target = tc->con_dev;
487 link_info.target_name = dev_name(&drvdata->csdev->dev);
489 link_err = coresight_add_sysfs_link(&link_info);
491 dev_warn(&drvdata->csdev->dev,
492 "Failed to set CTI sysfs link %s<=>%s\n",
493 link_info.orig_name, link_info.target_name);
497 static void cti_remove_sysfs_link(struct cti_drvdata *drvdata,
498 struct cti_trig_con *tc)
500 struct coresight_sysfs_link link_info;
502 link_info.orig = drvdata->csdev;
503 link_info.orig_name = tc->con_dev_name;
504 link_info.target = tc->con_dev;
505 link_info.target_name = dev_name(&drvdata->csdev->dev);
506 coresight_remove_sysfs_link(&link_info);
510 * Look for a matching connection device name in the list of connections.
511 * If found then swap in the csdev name, set trig con association pointer
515 cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name,
516 struct coresight_device *csdev)
518 struct cti_trig_con *tc;
519 struct cti_drvdata *drvdata = container_of(ctidev, struct cti_drvdata,
522 list_for_each_entry(tc, &ctidev->trig_cons, node) {
523 if (tc->con_dev_name) {
524 if (!strcmp(node_name, tc->con_dev_name)) {
525 /* match: so swap in csdev name & dev */
526 tc->con_dev_name = dev_name(&csdev->dev);
528 /* try to set sysfs link */
529 if (cti_add_sysfs_link(drvdata, tc))
531 /* link failed - remove CTI reference */
541 * Search the cti list to add an associated CTI into the supplied CS device
542 * This will set the association if CTI declared before the CS device.
543 * (called from coresight_register() with coresight_mutex locked).
545 static void cti_add_assoc_to_csdev(struct coresight_device *csdev)
547 struct cti_drvdata *ect_item;
548 struct cti_device *ctidev;
549 const char *node_name = NULL;
551 /* protect the list */
552 mutex_lock(&ect_mutex);
554 /* exit if current is an ECT device.*/
555 if ((csdev->type == CORESIGHT_DEV_TYPE_ECT) || list_empty(&ect_net))
558 /* if we didn't find the csdev previously we used the fwnode name */
559 node_name = cti_plat_get_node_name(dev_fwnode(csdev->dev.parent));
563 /* for each CTI in list... */
564 list_for_each_entry(ect_item, &ect_net, node) {
565 ctidev = &ect_item->ctidev;
566 if (cti_match_fixup_csdev(ctidev, node_name, csdev)) {
568 * if we found a matching csdev then update the ECT
569 * association pointer for the device with this CTI.
571 csdev->ect_dev = ect_item->csdev;
576 mutex_unlock(&ect_mutex);
580 * Removing the associated devices is easier.
581 * A CTI will not have a value for csdev->ect_dev.
583 static void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
585 struct cti_drvdata *ctidrv;
586 struct cti_trig_con *tc;
587 struct cti_device *ctidev;
589 mutex_lock(&ect_mutex);
590 if (csdev->ect_dev) {
591 ctidrv = csdev_to_cti_drvdata(csdev->ect_dev);
592 ctidev = &ctidrv->ctidev;
593 list_for_each_entry(tc, &ctidev->trig_cons, node) {
594 if (tc->con_dev == csdev) {
595 cti_remove_sysfs_link(ctidrv, tc);
600 csdev->ect_dev = NULL;
602 mutex_unlock(&ect_mutex);
606 * Operations to add and remove associated CTI.
607 * Register to coresight core driver as call back function.
609 static struct cti_assoc_op cti_assoc_ops = {
610 .add = cti_add_assoc_to_csdev,
611 .remove = cti_remove_assoc_from_csdev
615 * Update the cross references where the associated device was found
616 * while we were building the connection info. This will occur if the
617 * assoc device was registered before the CTI.
619 static void cti_update_conn_xrefs(struct cti_drvdata *drvdata)
621 struct cti_trig_con *tc;
622 struct cti_device *ctidev = &drvdata->ctidev;
624 list_for_each_entry(tc, &ctidev->trig_cons, node) {
626 /* if we can set the sysfs link */
627 if (cti_add_sysfs_link(drvdata, tc))
628 /* set the CTI/csdev association */
629 coresight_set_assoc_ectdev_mutex(tc->con_dev,
632 /* otherwise remove reference from CTI */
638 static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata)
640 struct cti_trig_con *tc;
641 struct cti_device *ctidev = &drvdata->ctidev;
643 list_for_each_entry(tc, &ctidev->trig_cons, node) {
645 coresight_set_assoc_ectdev_mutex(tc->con_dev,
647 cti_remove_sysfs_link(drvdata, tc);
653 /** cti PM callbacks **/
654 static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
657 struct cti_drvdata *drvdata;
658 unsigned int cpu = smp_processor_id();
659 int notify_res = NOTIFY_OK;
661 if (!cti_cpu_drvdata[cpu])
664 drvdata = cti_cpu_drvdata[cpu];
666 if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
669 spin_lock(&drvdata->spinlock);
673 /* CTI regs all static - we have a copy & nothing to save */
674 drvdata->config.hw_powered = false;
675 if (drvdata->config.hw_enabled)
676 coresight_disclaim_device(drvdata->base);
679 case CPU_PM_ENTER_FAILED:
680 drvdata->config.hw_powered = true;
681 if (drvdata->config.hw_enabled) {
682 if (coresight_claim_device(drvdata->base))
683 drvdata->config.hw_enabled = false;
688 /* write hardware registers to re-enable. */
689 drvdata->config.hw_powered = true;
690 drvdata->config.hw_enabled = false;
692 /* check enable reference count to enable HW */
693 if (atomic_read(&drvdata->config.enable_req_count)) {
694 /* check we can claim the device as we re-power */
695 if (coresight_claim_device(drvdata->base))
696 goto cti_notify_exit;
698 drvdata->config.hw_enabled = true;
699 cti_write_all_hw_regs(drvdata);
704 notify_res = NOTIFY_DONE;
709 spin_unlock(&drvdata->spinlock);
713 static struct notifier_block cti_cpu_pm_nb = {
714 .notifier_call = cti_cpu_pm_notify,
717 /* CPU HP handlers */
718 static int cti_starting_cpu(unsigned int cpu)
720 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
725 cti_cpuhp_enable_hw(drvdata);
729 static int cti_dying_cpu(unsigned int cpu)
731 struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
736 spin_lock(&drvdata->spinlock);
737 drvdata->config.hw_powered = false;
738 if (drvdata->config.hw_enabled)
739 coresight_disclaim_device(drvdata->base);
740 spin_unlock(&drvdata->spinlock);
744 static int cti_pm_setup(struct cti_drvdata *drvdata)
748 if (drvdata->ctidev.cpu == -1)
755 ret = cpuhp_setup_state_nocalls_cpuslocked(
756 CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
757 "arm/coresight_cti:starting",
758 cti_starting_cpu, cti_dying_cpu);
764 ret = cpu_pm_register_notifier(&cti_cpu_pm_nb);
767 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
773 cti_cpu_drvdata[drvdata->ctidev.cpu] = drvdata;
778 /* release PM registrations */
779 static void cti_pm_release(struct cti_drvdata *drvdata)
781 if (drvdata->ctidev.cpu == -1)
784 cti_cpu_drvdata[drvdata->ctidev.cpu] = NULL;
785 if (--nr_cti_cpu == 0) {
786 cpu_pm_unregister_notifier(&cti_cpu_pm_nb);
787 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
791 /** cti ect operations **/
792 int cti_enable(struct coresight_device *csdev)
794 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
796 return cti_enable_hw(drvdata);
799 int cti_disable(struct coresight_device *csdev)
801 struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
803 return cti_disable_hw(drvdata);
806 static const struct coresight_ops_ect cti_ops_ect = {
807 .enable = cti_enable,
808 .disable = cti_disable,
811 static const struct coresight_ops cti_ops = {
812 .ect_ops = &cti_ops_ect,
816 * Free up CTI specific resources
817 * called by dev->release, need to call down to underlying csdev release.
819 static void cti_device_release(struct device *dev)
821 struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
822 struct cti_drvdata *ect_item, *ect_tmp;
824 mutex_lock(&ect_mutex);
825 cti_pm_release(drvdata);
827 /* remove from the list */
828 list_for_each_entry_safe(ect_item, ect_tmp, &ect_net, node) {
829 if (ect_item == drvdata) {
830 list_del(&ect_item->node);
834 mutex_unlock(&ect_mutex);
836 if (drvdata->csdev_release)
837 drvdata->csdev_release(dev);
839 static void cti_remove(struct amba_device *adev)
841 struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev);
843 mutex_lock(&ect_mutex);
844 cti_remove_conn_xrefs(drvdata);
845 mutex_unlock(&ect_mutex);
847 coresight_unregister(drvdata->csdev);
850 static int cti_probe(struct amba_device *adev, const struct amba_id *id)
854 struct device *dev = &adev->dev;
855 struct cti_drvdata *drvdata = NULL;
856 struct coresight_desc cti_desc;
857 struct coresight_platform_data *pdata = NULL;
858 struct resource *res = &adev->res;
861 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
865 /* Validity for the resource is already checked by the AMBA core */
866 base = devm_ioremap_resource(dev, res);
868 return PTR_ERR(base);
870 drvdata->base = base;
872 dev_set_drvdata(dev, drvdata);
874 /* default CTI device info */
875 drvdata->ctidev.cpu = -1;
876 drvdata->ctidev.nr_trig_con = 0;
877 drvdata->ctidev.ctm_id = 0;
878 INIT_LIST_HEAD(&drvdata->ctidev.trig_cons);
880 spin_lock_init(&drvdata->spinlock);
882 /* initialise CTI driver config values */
883 cti_set_default_config(dev, drvdata);
885 pdata = coresight_cti_get_platform_data(dev);
887 dev_err(dev, "coresight_cti_get_platform_data err\n");
888 return PTR_ERR(pdata);
891 /* default to powered - could change on PM notifications */
892 drvdata->config.hw_powered = true;
894 /* set up device name - will depend if cpu bound or otherwise */
895 if (drvdata->ctidev.cpu >= 0)
896 cti_desc.name = devm_kasprintf(dev, GFP_KERNEL, "cti_cpu%d",
897 drvdata->ctidev.cpu);
899 cti_desc.name = coresight_alloc_device_name(&cti_sys_devs, dev);
903 /* setup CPU power management handling for CPU bound CTI devices. */
904 ret = cti_pm_setup(drvdata);
908 /* create dynamic attributes for connections */
909 ret = cti_create_cons_sysfs(dev, drvdata);
911 dev_err(dev, "%s: create dynamic sysfs entries failed\n",
916 /* set up coresight component description */
917 cti_desc.pdata = pdata;
918 cti_desc.type = CORESIGHT_DEV_TYPE_ECT;
919 cti_desc.subtype.ect_subtype = CORESIGHT_DEV_SUBTYPE_ECT_CTI;
920 cti_desc.ops = &cti_ops;
921 cti_desc.groups = drvdata->ctidev.con_groups;
923 drvdata->csdev = coresight_register(&cti_desc);
924 if (IS_ERR(drvdata->csdev)) {
925 ret = PTR_ERR(drvdata->csdev);
929 /* add to list of CTI devices */
930 mutex_lock(&ect_mutex);
931 list_add(&drvdata->node, &ect_net);
932 /* set any cross references */
933 cti_update_conn_xrefs(drvdata);
934 mutex_unlock(&ect_mutex);
936 /* set up release chain */
937 drvdata->csdev_release = drvdata->csdev->dev.release;
938 drvdata->csdev->dev.release = cti_device_release;
940 /* all done - dec pm refcount */
941 pm_runtime_put(&adev->dev);
942 dev_info(&drvdata->csdev->dev, "CTI initialized\n");
946 cti_pm_release(drvdata);
950 static struct amba_cs_uci_id uci_id_cti[] = {
953 .devarch = 0x47701a14, /* CTI v2 */
954 .devarch_mask = 0xfff0ffff,
955 .devtype = 0x00000014, /* maj(0x4-debug) min(0x1-ECT) */
959 static const struct amba_id cti_ids[] = {
960 CS_AMBA_ID(0x000bb906), /* Coresight CTI (SoC 400), C-A72, C-A57 */
961 CS_AMBA_ID(0x000bb922), /* CTI - C-A8 */
962 CS_AMBA_ID(0x000bb9a8), /* CTI - C-A53 */
963 CS_AMBA_ID(0x000bb9aa), /* CTI - C-A73 */
964 CS_AMBA_UCI_ID(0x000bb9da, uci_id_cti), /* CTI - C-A35 */
965 CS_AMBA_UCI_ID(0x000bb9ed, uci_id_cti), /* Coresight CTI (SoC 600) */
969 MODULE_DEVICE_TABLE(amba, cti_ids);
971 static struct amba_driver cti_driver = {
973 .name = "coresight-cti",
974 .owner = THIS_MODULE,
975 .suppress_bind_attrs = true,
978 .remove = cti_remove,
982 static int __init cti_init(void)
986 ret = amba_driver_register(&cti_driver);
988 pr_info("Error registering cti driver\n");
989 coresight_set_cti_ops(&cti_assoc_ops);
993 static void __exit cti_exit(void)
995 coresight_remove_cti_ops();
996 amba_driver_unregister(&cti_driver);
999 module_init(cti_init);
1000 module_exit(cti_exit);
1002 MODULE_AUTHOR("Mike Leach <mike.leach@linaro.org>");
1003 MODULE_DESCRIPTION("Arm CoreSight CTI Driver");
1004 MODULE_LICENSE("GPL v2");