// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018 Linaro Limited, All rights reserved.
* Author: Mike Leach <[email protected]>
*/
#include <linux/amba/bus.h>
#include <linux/atomic.h>
#include <linux/bits.h>
#include <linux/coresight.h>
#include <linux/cpu_pm.h>
#include <linux/cpuhotplug.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <linux/spinlock.h>
#include "coresight-priv.h"
#include "coresight-cti.h"
/*
* CTI devices can be associated with a PE, or be connected to CoreSight
* hardware. We have a list of all CTIs irrespective of CPU bound or
* otherwise.
*
* We assume that the non-CPU CTIs are always powered as we do with sinks etc.
*
* We leave the client to figure out if all the CTIs are interconnected with
* the same CTM, in general this is the case but does not always have to be.
*/
/* net of CTI devices connected via CTM */
static LIST_HEAD(ect_net);
/* protect the list */
static DEFINE_MUTEX(ect_mutex);
#define csdev_to_cti_drvdata(csdev) \
dev_get_drvdata(csdev->dev.parent)
/* power management handling */
static int nr_cti_cpu;
/* quick lookup list for CPU bound CTIs when power handling */
static struct cti_drvdata *cti_cpu_drvdata[NR_CPUS];
/*
* CTI naming. CTI bound to cores will have the name cti_cpu<N> where
* N is the CPU ID. System CTIs will have the name cti_sys<I> where I
* is an index allocated by order of discovery.
*
* CTI device name list - for CTI not bound to cores.
*/
DEFINE_CORESIGHT_DEVLIST(cti_sys_devs, "cti_sys");
/* write set of regs to hardware - call with spinlock claimed */
void cti_write_all_hw_regs(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
int i;
CS_UNLOCK(drvdata->base);
/* disable CTI before writing registers */
writel_relaxed(0, drvdata->base + CTICONTROL);
/* write the CTI trigger registers */
for (i = 0; i < config->nr_trig_max; i++) {
writel_relaxed(config->ctiinen[i], drvdata->base + CTIINEN(i));
writel_relaxed(config->ctiouten[i],
drvdata->base + CTIOUTEN(i));
}
/* other regs */
writel_relaxed(config->ctigate, drvdata->base + CTIGATE);
writel_relaxed(config->asicctl, drvdata->base + ASICCTL);
writel_relaxed(config->ctiappset, drvdata->base + CTIAPPSET);
/* re-enable CTI */
writel_relaxed(1, drvdata->base + CTICONTROL);
CS_LOCK(drvdata->base);
}
/* write regs to hardware and enable */
static int cti_enable_hw(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
unsigned long flags;
int rc = 0;
spin_lock_irqsave(&drvdata->spinlock, flags);
/* no need to do anything if enabled or unpowered*/
if (config->hw_enabled || !config->hw_powered)
goto cti_state_unchanged;
/* claim the device */
rc = coresight_claim_device(drvdata->csdev);
if (rc)
goto cti_err_not_enabled;
cti_write_all_hw_regs(drvdata);
config->hw_enabled = true;
drvdata->config.enable_req_count++;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
cti_state_unchanged:
drvdata->config.enable_req_count++;
/* cannot enable due to error */
cti_err_not_enabled:
spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
}
/* re-enable CTI on CPU when using CPU hotplug */
static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
spin_lock(&drvdata->spinlock);
config->hw_powered = true;
/* no need to do anything if no enable request */
if (!drvdata->config.enable_req_count)
goto cti_hp_not_enabled;
/* try to claim the device */
if (coresight_claim_device(drvdata->csdev))
goto cti_hp_not_enabled;
cti_write_all_hw_regs(drvdata);
config->hw_enabled = true;
spin_unlock(&drvdata->spinlock);
return;
/* did not re-enable due to no claim / no request */
cti_hp_not_enabled:
spin_unlock(&drvdata->spinlock);
}
/* disable hardware */
static int cti_disable_hw(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
struct coresight_device *csdev = drvdata->csdev;
int ret = 0;
spin_lock(&drvdata->spinlock);
/* don't allow negative refcounts, return an error */
if (!drvdata->config.enable_req_count) {
ret = -EINVAL;
goto cti_not_disabled;
}
/* check refcount - disable on 0 */
if (--drvdata->config.enable_req_count > 0)
goto cti_not_disabled;
/* no need to do anything if disabled or cpu unpowered */
if (!config->hw_enabled || !config->hw_powered)
goto cti_not_disabled;
CS_UNLOCK(drvdata->base);
/* disable CTI */
writel_relaxed(0, drvdata->base + CTICONTROL);
config->hw_enabled = false;
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(drvdata->base);
spin_unlock(&drvdata->spinlock);
return ret;
/* not disabled this call */
cti_not_disabled:
spin_unlock(&drvdata->spinlock);
return ret;
}
void cti_write_single_reg(struct cti_drvdata *drvdata, int offset, u32 value)
{
CS_UNLOCK(drvdata->base);
writel_relaxed(value, drvdata->base + offset);
CS_LOCK(drvdata->base);
}
void cti_write_intack(struct device *dev, u32 ackval)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
spin_lock(&drvdata->spinlock);
/* write if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIINTACK, ackval);
spin_unlock(&drvdata->spinlock);
}
/*
* Look at the HW DEVID register for some of the HW settings.
* DEVID[15:8] - max number of in / out triggers.
*/
#define CTI_DEVID_MAXTRIGS(devid_val) ((int) BMVAL(devid_val, 8, 15))
/* DEVID[19:16] - number of CTM channels */
#define CTI_DEVID_CTMCHANNELS(devid_val) ((int) BMVAL(devid_val, 16, 19))
static void cti_set_default_config(struct device *dev,
struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
u32 devid;
devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
config->nr_trig_max = CTI_DEVID_MAXTRIGS(devid);
/*
* no current hardware should exceed this, but protect the driver
* in case of fault / out of spec hw
*/
if (config->nr_trig_max > CTIINOUTEN_MAX) {
dev_warn_once(dev,
"Limiting HW MaxTrig value(%d) to driver max(%d)\n",
config->nr_trig_max, CTIINOUTEN_MAX);
config->nr_trig_max = CTIINOUTEN_MAX;
}
config->nr_ctm_channels = CTI_DEVID_CTMCHANNELS(devid);
/* Most regs default to 0 as zalloc'ed except...*/
config->trig_filter_enable = true;
config->ctigate = GENMASK(config->nr_ctm_channels - 1, 0);
config->enable_req_count = 0;
}
/*
* Add a connection entry to the list of connections for this
* CTI device.
*/
int cti_add_connection_entry(struct device *dev, struct cti_drvdata *drvdata,
struct cti_trig_con *tc,
struct coresight_device *csdev,
const char *assoc_dev_name)
{
struct cti_device *cti_dev = &drvdata->ctidev;
tc->con_dev = csdev;
/*
* Prefer actual associated CS device dev name to supplied value -
* which is likely to be node name / other conn name.
*/
if (csdev)
tc->con_dev_name = dev_name(&csdev->dev);
else if (assoc_dev_name != NULL) {
tc->con_dev_name = devm_kstrdup(dev,
assoc_dev_name, GFP_KERNEL);
if (!tc->con_dev_name)
return -ENOMEM;
}
list_add_tail(&tc->node, &cti_dev->trig_cons);
cti_dev->nr_trig_con++;
/* add connection usage bit info to overall info */
drvdata->config.trig_in_use |= tc->con_in->used_mask;
drvdata->config.trig_out_use |= tc->con_out->used_mask;
return 0;
}
/* create a trigger connection with appropriately sized signal groups */
struct cti_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs,
int out_sigs)
{
struct cti_trig_con *tc = NULL;
struct cti_trig_grp *in = NULL, *out = NULL;
tc = devm_kzalloc(dev, sizeof(struct cti_trig_con), GFP_KERNEL);
if (!tc)
return tc;
in = devm_kzalloc(dev,
offsetof(struct cti_trig_grp, sig_types[in_sigs]),
GFP_KERNEL);
if (!in)
return NULL;
out = devm_kzalloc(dev,
offsetof(struct cti_trig_grp, sig_types[out_sigs]),
GFP_KERNEL);
if (!out)
return NULL;
tc->con_in = in;
tc->con_out = out;
tc->con_in->nr_sigs = in_sigs;
tc->con_out->nr_sigs = out_sigs;
return tc;
}
/*
* Add a default connection if nothing else is specified.
* single connection based on max in/out info, no assoc device
*/
int cti_add_default_connection(struct device *dev, struct cti_drvdata *drvdata)
{
int ret = 0;
int n_trigs = drvdata->config.nr_trig_max;
u32 n_trig_mask = GENMASK(n_trigs - 1, 0);
struct cti_trig_con *tc = NULL;
/*
* Assume max trigs for in and out,
* all used, default sig types allocated
*/
tc = cti_allocate_trig_con(dev, n_trigs, n_trigs);
if (!tc)
return -ENOMEM;
tc->con_in->used_mask = n_trig_mask;
tc->con_out->used_mask = n_trig_mask;
ret = cti_add_connection_entry(dev, drvdata, tc, NULL, "default");
return ret;
}
/** cti channel api **/
/* attach/detach channel from trigger - write through if enabled. */
int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
enum cti_trig_dir direction, u32 channel_idx,
u32 trigger_idx)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
u32 trig_bitmask;
u32 chan_bitmask;
u32 reg_value;
int reg_offset;
/* ensure indexes in range */
if ((channel_idx >= config->nr_ctm_channels) ||
(trigger_idx >= config->nr_trig_max))
return -EINVAL;
trig_bitmask = BIT(trigger_idx);
/* ensure registered triggers and not out filtered */
if (direction == CTI_TRIG_IN) {
if (!(trig_bitmask & config->trig_in_use))
return -EINVAL;
} else {
if (!(trig_bitmask & config->trig_out_use))
return -EINVAL;
if ((config->trig_filter_enable) &&
(config->trig_out_filter & trig_bitmask))
return -EINVAL;
}
/* update the local register values */
chan_bitmask = BIT(channel_idx);
reg_offset = (direction == CTI_TRIG_IN ? CTIINEN(trigger_idx) :
CTIOUTEN(trigger_idx));
spin_lock(&drvdata->spinlock);
/* read - modify write - the trigger / channel enable value */
reg_value = direction == CTI_TRIG_IN ? config->ctiinen[trigger_idx] :
config->ctiouten[trigger_idx];
if (op == CTI_CHAN_ATTACH)
reg_value |= chan_bitmask;
else
reg_value &= ~chan_bitmask;
/* write local copy */
if (direction == CTI_TRIG_IN)
config->ctiinen[trigger_idx] = reg_value;
else
config->ctiouten[trigger_idx] = reg_value;
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, reg_offset, reg_value);
spin_unlock(&drvdata->spinlock);
return 0;
}
int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
u32 channel_idx)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
u32 chan_bitmask;
u32 reg_value;
int err = 0;
if (channel_idx >= config->nr_ctm_channels)
return -EINVAL;
chan_bitmask = BIT(channel_idx);
spin_lock(&drvdata->spinlock);
reg_value = config->ctigate;
switch (op) {
case CTI_GATE_CHAN_ENABLE:
reg_value |= chan_bitmask;
break;
case CTI_GATE_CHAN_DISABLE:
reg_value &= ~chan_bitmask;
break;
default:
err = -EINVAL;
break;
}
if (err == 0) {
config->ctigate = reg_value;
if (cti_active(config))
cti_write_single_reg(drvdata, CTIGATE, reg_value);
}
spin_unlock(&drvdata->spinlock);
return err;
}
int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
u32 channel_idx)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
u32 chan_bitmask;
u32 reg_value;
u32 reg_offset;
int err = 0;
if (channel_idx >= config->nr_ctm_channels)
return -EINVAL;
chan_bitmask = BIT(channel_idx);
spin_lock(&drvdata->spinlock);
reg_value = config->ctiappset;
switch (op) {
case CTI_CHAN_SET:
config->ctiappset |= chan_bitmask;
reg_value = config->ctiappset;
reg_offset = CTIAPPSET;
break;
case CTI_CHAN_CLR:
config->ctiappset &= ~chan_bitmask;
reg_value = chan_bitmask;
reg_offset = CTIAPPCLEAR;
break;
case CTI_CHAN_PULSE:
config->ctiappset &= ~chan_bitmask;
reg_value = chan_bitmask;
reg_offset = CTIAPPPULSE;
break;
default:
err = -EINVAL;
break;
}
if ((err == 0) && cti_active(config))
cti_write_single_reg(drvdata, reg_offset, reg_value);
spin_unlock(&drvdata->spinlock);
return err;
}
static bool cti_add_sysfs_link(struct cti_drvdata *drvdata,
struct cti_trig_con *tc)
{
struct coresight_sysfs_link link_info;
int link_err = 0;
link_info.orig = drvdata->csdev;
link_info.orig_name = tc->con_dev_name;
link_info.target = tc->con_dev;
link_info.target_name = dev_name(&drvdata->csdev->dev);
link_err = coresight_add_sysfs_link(&link_info);
if (link_err)
dev_warn(&drvdata->csdev->dev,
"Failed to set CTI sysfs link %s<=>%s\n",
link_info.orig_name, link_info.target_name);
return !link_err;
}
static void cti_remove_sysfs_link(struct cti_drvdata *drvdata,
struct cti_trig_con *tc)
{
struct coresight_sysfs_link link_info;
link_info.orig = drvdata->csdev;
link_info.orig_name = tc->con_dev_name;
link_info.target = tc->con_dev;
link_info.target_name = dev_name(&drvdata->csdev->dev);
coresight_remove_sysfs_link(&link_info);
}
/*
* Look for a matching connection device name in the list of connections.
* If found then swap in the csdev name, set trig con association pointer
* and return found.
*/
static bool
cti_match_fixup_csdev(struct cti_device *ctidev, const char *node_name,
struct coresight_device *csdev)
{
struct cti_trig_con *tc;
struct cti_drvdata *drvdata = container_of(ctidev, struct cti_drvdata,
ctidev);
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev_name) {
if (!strcmp(node_name, tc->con_dev_name)) {
/* match: so swap in csdev name & dev */
tc->con_dev_name = dev_name(&csdev->dev);
tc->con_dev = csdev;
/* try to set sysfs link */
if (cti_add_sysfs_link(drvdata, tc))
return true;
/* link failed - remove CTI reference */
tc->con_dev = NULL;
break;
}
}
}
return false;
}
/*
* Search the cti list to add an associated CTI into the supplied CS device
* This will set the association if CTI declared before the CS device.
* (called from coresight_register() without coresight_mutex locked).
*/
static void cti_add_assoc_to_csdev(struct coresight_device *csdev)
{
struct cti_drvdata *ect_item;
struct cti_device *ctidev;
const char *node_name = NULL;
/* protect the list */
mutex_lock(&ect_mutex);
/* exit if current is an ECT device.*/
if ((csdev->type == CORESIGHT_DEV_TYPE_HELPER &&
csdev->subtype.helper_subtype ==
CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI) ||
list_empty(&ect_net))
goto cti_add_done;
/* if we didn't find the csdev previously we used the fwnode name */
node_name = cti_plat_get_node_name(dev_fwnode(csdev->dev.parent));
if (!node_name)
goto cti_add_done;
/* for each CTI in list... */
list_for_each_entry(ect_item, &ect_net, node) {
ctidev = &ect_item->ctidev;
if (cti_match_fixup_csdev(ctidev, node_name, csdev)) {
/*
* if we found a matching csdev then update the ECT
* association pointer for the device with this CTI.
*/
coresight_add_helper(csdev, ect_item->csdev);
break;
}
}
cti_add_done:
mutex_unlock(&ect_mutex);
}
/*
* Removing the associated devices is easier.
*/
static void cti_remove_assoc_from_csdev(struct coresight_device *csdev)
{
struct cti_drvdata *ctidrv;
struct cti_trig_con *tc;
struct cti_device *ctidev;
union coresight_dev_subtype cti_subtype = {
.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI
};
struct coresight_device *cti_csdev = coresight_find_output_type(
csdev->pdata, CORESIGHT_DEV_TYPE_HELPER, cti_subtype);
if (!cti_csdev)
return;
mutex_lock(&ect_mutex);
ctidrv = csdev_to_cti_drvdata(cti_csdev);
ctidev = &ctidrv->ctidev;
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev == csdev) {
cti_remove_sysfs_link(ctidrv, tc);
tc->con_dev = NULL;
break;
}
}
mutex_unlock(&ect_mutex);
}
/*
* Operations to add and remove associated CTI.
* Register to coresight core driver as call back function.
*/
static struct cti_assoc_op cti_assoc_ops = {
.add = cti_add_assoc_to_csdev,
.remove = cti_remove_assoc_from_csdev
};
/*
* Update the cross references where the associated device was found
* while we were building the connection info. This will occur if the
* assoc device was registered before the CTI.
*/
static void cti_update_conn_xrefs(struct cti_drvdata *drvdata)
{
struct cti_trig_con *tc;
struct cti_device *ctidev = &drvdata->ctidev;
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev) {
/* if we can set the sysfs link */
if (cti_add_sysfs_link(drvdata, tc))
/* set the CTI/csdev association */
coresight_add_helper(tc->con_dev,
drvdata->csdev);
else
/* otherwise remove reference from CTI */
tc->con_dev = NULL;
}
}
}
static void cti_remove_conn_xrefs(struct cti_drvdata *drvdata)
{
struct cti_trig_con *tc;
struct cti_device *ctidev = &drvdata->ctidev;
list_for_each_entry(tc, &ctidev->trig_cons, node) {
if (tc->con_dev) {
cti_remove_sysfs_link(drvdata, tc);
tc->con_dev = NULL;
}
}
}
/** cti PM callbacks **/
static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
void *v)
{
struct cti_drvdata *drvdata;
struct coresight_device *csdev;
unsigned int cpu = smp_processor_id();
int notify_res = NOTIFY_OK;
if (!cti_cpu_drvdata[cpu])
return NOTIFY_OK;
drvdata = cti_cpu_drvdata[cpu];
csdev = drvdata->csdev;
if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
return NOTIFY_BAD;
spin_lock(&drvdata->spinlock);
switch (cmd) {
case CPU_PM_ENTER:
/* CTI regs all static - we have a copy & nothing to save */
drvdata->config.hw_powered = false;
if (drvdata->config.hw_enabled)
coresight_disclaim_device(csdev);
break;
case CPU_PM_ENTER_FAILED:
drvdata->config.hw_powered = true;
if (drvdata->config.hw_enabled) {
if (coresight_claim_device(csdev))
drvdata->config.hw_enabled = false;
}
break;
case CPU_PM_EXIT:
/* write hardware registers to re-enable. */
drvdata->config.hw_powered = true;
drvdata->config.hw_enabled = false;
/* check enable reference count to enable HW */
if (drvdata->config.enable_req_count) {
/* check we can claim the device as we re-power */
if (coresight_claim_device(csdev))
goto cti_notify_exit;
drvdata->config.hw_enabled = true;
cti_write_all_hw_regs(drvdata);
}
break;
default:
notify_res = NOTIFY_DONE;
break;
}
cti_notify_exit:
spin_unlock(&drvdata->spinlock);
return notify_res;
}
static struct notifier_block cti_cpu_pm_nb = {
.notifier_call = cti_cpu_pm_notify,
};
/* CPU HP handlers */
static int cti_starting_cpu(unsigned int cpu)
{
struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
if (!drvdata)
return 0;
cti_cpuhp_enable_hw(drvdata);
return 0;
}
static int cti_dying_cpu(unsigned int cpu)
{
struct cti_drvdata *drvdata = cti_cpu_drvdata[cpu];
if (!drvdata)
return 0;
spin_lock(&drvdata->spinlock);
drvdata->config.hw_powered = false;
if (drvdata->config.hw_enabled)
coresight_disclaim_device(drvdata->csdev);
spin_unlock(&drvdata->spinlock);
return 0;
}
static int cti_pm_setup(struct cti_drvdata *drvdata)
{
int ret;
if (drvdata->ctidev.cpu == -1)
return 0;
if (nr_cti_cpu)
goto done;
cpus_read_lock();
ret = cpuhp_setup_state_nocalls_cpuslocked(
CPUHP_AP_ARM_CORESIGHT_CTI_STARTING,
"arm/coresight_cti:starting",
cti_starting_cpu, cti_dying_cpu);
if (ret) {
cpus_read_unlock();
return ret;
}
ret = cpu_pm_register_notifier(&cti_cpu_pm_nb);
cpus_read_unlock();
if (ret) {
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
return ret;
}
done:
nr_cti_cpu++;
cti_cpu_drvdata[drvdata->ctidev.cpu] = drvdata;
return 0;
}
/* release PM registrations */
static void cti_pm_release(struct cti_drvdata *drvdata)
{
if (drvdata->ctidev.cpu == -1)
return;
cti_cpu_drvdata[drvdata->ctidev.cpu] = NULL;
if (--nr_cti_cpu == 0) {
cpu_pm_unregister_notifier(&cti_cpu_pm_nb);
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_CTI_STARTING);
}
}
/** cti ect operations **/
int cti_enable(struct coresight_device *csdev, enum cs_mode mode, void *data)
{
struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
return cti_enable_hw(drvdata);
}
int cti_disable(struct coresight_device *csdev, void *data)
{
struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
return cti_disable_hw(drvdata);
}
static const struct coresight_ops_helper cti_ops_ect = {
.enable = cti_enable,
.disable = cti_disable,
};
static const struct coresight_ops cti_ops = {
.helper_ops = &cti_ops_ect,
};
/*
* Free up CTI specific resources
* called by dev->release, need to call down to underlying csdev release.
*/
static void cti_device_release(struct device *dev)
{
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_drvdata *ect_item, *ect_tmp;
mutex_lock(&ect_mutex);
cti_pm_release(drvdata);
/* remove from the list */
list_for_each_entry_safe(ect_item, ect_tmp, &ect_net, node) {
if (ect_item == drvdata) {
list_del(&ect_item->node);
break;
}
}
mutex_unlock(&ect_mutex);
if (drvdata->csdev_release)
drvdata->csdev_release(dev);
}
static void cti_remove(struct amba_device *adev)
{
struct cti_drvdata *drvdata = dev_get_drvdata(&adev->dev);
mutex_lock(&ect_mutex);
cti_remove_conn_xrefs(drvdata);
mutex_unlock(&ect_mutex);
coresight_unregister(drvdata->csdev);
}
static int cti_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret = 0;
void __iomem *base;
struct device *dev = &adev->dev;
struct cti_drvdata *drvdata = NULL;
struct coresight_desc cti_desc;
struct coresight_platform_data *pdata = NULL;
struct resource *res = &adev->res;
/* driver data*/
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
/* Validity for the resource is already checked by the AMBA core */
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
cti_desc.access = CSDEV_ACCESS_IOMEM(base);
dev_set_drvdata(dev, drvdata);
/* default CTI device info */
drvdata->ctidev.cpu = -1;
drvdata->ctidev.nr_trig_con = 0;
drvdata->ctidev.ctm_id = 0;
INIT_LIST_HEAD(&drvdata->ctidev.trig_cons);
spin_lock_init(&drvdata->spinlock);
/* initialise CTI driver config values */
cti_set_default_config(dev, drvdata);
pdata = coresight_cti_get_platform_data(dev);
if (IS_ERR(pdata)) {
dev_err(dev, "coresight_cti_get_platform_data err\n");
return PTR_ERR(pdata);
}
/* default to powered - could change on PM notifications */
drvdata->config.hw_powered = true;
/* set up device name - will depend if cpu bound or otherwise */
if (drvdata->ctidev.cpu >= 0)
cti_desc.name = devm_kasprintf(dev, GFP_KERNEL, "cti_cpu%d",
drvdata->ctidev.cpu);
else
cti_desc.name = coresight_alloc_device_name(&cti_sys_devs, dev);
if (!cti_desc.name)
return -ENOMEM;
/* setup CPU power management handling for CPU bound CTI devices. */
ret = cti_pm_setup(drvdata);
if (ret)
return ret;
/* create dynamic attributes for connections */
ret = cti_create_cons_sysfs(dev, drvdata);
if (ret) {
dev_err(dev, "%s: create dynamic sysfs entries failed\n",
cti_desc.name);
goto pm_release;
}
/* set up coresight component description */
cti_desc.pdata = pdata;
cti_desc.type = CORESIGHT_DEV_TYPE_HELPER;
cti_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_ECT_CTI;
cti_desc.ops = &cti_ops;
cti_desc.groups = drvdata->ctidev.con_groups;
cti_desc.dev = dev;
drvdata->csdev = coresight_register(&cti_desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto pm_release;
}
/* add to list of CTI devices */
mutex_lock(&ect_mutex);
list_add(&drvdata->node, &ect_net);
/* set any cross references */
cti_update_conn_xrefs(drvdata);
mutex_unlock(&ect_mutex);
/* set up release chain */
drvdata->csdev_release = drvdata->csdev->dev.release;
drvdata->csdev->dev.release = cti_device_release;
/* all done - dec pm refcount */
pm_runtime_put(&adev->dev);
dev_info(&drvdata->csdev->dev, "CTI initialized\n");
return 0;
pm_release:
cti_pm_release(drvdata);
return ret;
}
static struct amba_cs_uci_id uci_id_cti[] = {
{
/* CTI UCI data */
.devarch = 0x47701a14, /* CTI v2 */
.devarch_mask = 0xfff0ffff,
.devtype = 0x00000014, /* maj(0x4-debug) min(0x1-ECT) */
}
};
static const struct amba_id cti_ids[] = {
CS_AMBA_ID(0x000bb906), /* Coresight CTI (SoC 400), C-A72, C-A57 */
CS_AMBA_ID(0x000bb922), /* CTI - C-A8 */
CS_AMBA_ID(0x000bb9a8), /* CTI - C-A53 */
CS_AMBA_ID(0x000bb9aa), /* CTI - C-A73 */
CS_AMBA_UCI_ID(0x000bb9da, uci_id_cti), /* CTI - C-A35 */
CS_AMBA_UCI_ID(0x000bb9ed, uci_id_cti), /* Coresight CTI (SoC 600) */
{ 0, 0, NULL },
};
MODULE_DEVICE_TABLE(amba, cti_ids);
static struct amba_driver cti_driver = {
.drv = {
.name = "coresight-cti",
.suppress_bind_attrs = true,
},
.probe = cti_probe,
.remove = cti_remove,
.id_table = cti_ids,
};
static int __init cti_init(void)
{
int ret;
ret = amba_driver_register(&cti_driver);
if (ret)
pr_info("Error registering cti driver\n");
coresight_set_cti_ops(&cti_assoc_ops);
return ret;
}
static void __exit cti_exit(void)
{
coresight_remove_cti_ops();
amba_driver_unregister(&cti_driver);
}
module_init(cti_init);
module_exit(cti_exit);
MODULE_AUTHOR("Mike Leach <[email protected]>");
MODULE_DESCRIPTION("Arm CoreSight CTI Driver");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux