Re: [PATCH v5 01/14] coresight: cti: Initial CoreSight CTI Driver

Mike Leach
2019-11-29T12:05:39Z

Hi Mathieu,

On Thu, 21 Nov 2019 at 20:21, Mathieu Poirier
<mathieu.poirier@linaro.org> wrote:
>
> On Tue, Nov 19, 2019 at 11:18:59PM +0000, Mike Leach wrote:
> > This introduces a baseline CTI driver and associated configuration files.
> >
> > Uses the platform agnostic naming standard for CoreSight devices, along
> > with a generic platform probing method that currently supports device
> > tree descriptions, but allows for the ACPI bindings to be added once these
> > have been defined for the CTI devices.
> >
> > Driver will probe for the device on the AMBA bus, and load the CTI driver
> > on CoreSight ID match to CTI IDs in tables.
> >
> > Initial sysfs support for enable / disable provided.
> >
> > Default CTI interconnection data is generated based on hardware
> > register signal counts, with no additional connection information.
> >
> > Signed-off-by: Mike Leach <mike.leach@linaro.org>
> > ---
> > drivers/hwtracing/coresight/Kconfig | 12 +
> > drivers/hwtracing/coresight/Makefile | 3 +
> > .../coresight/coresight-cti-platform.c | 53 +++
> > .../hwtracing/coresight/coresight-cti-sysfs.c | 72 +++
> > drivers/hwtracing/coresight/coresight-cti.c | 448 ++++++++++++++++++
> > drivers/hwtracing/coresight/coresight-cti.h | 186 ++++++++
> > drivers/hwtracing/coresight/coresight.c | 3 +
> > include/linux/coresight.h | 23 +
> > 8 files changed, 800 insertions(+)
> > create mode 100644 drivers/hwtracing/coresight/coresight-cti-platform.c
> > create mode 100644 drivers/hwtracing/coresight/coresight-cti-sysfs.c
> > create mode 100644 drivers/hwtracing/coresight/coresight-cti.c
> > create mode 100644 drivers/hwtracing/coresight/coresight-cti.h
> >
> > diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> > index 6ff30e25af55..45d3822c8c8c 100644
> > --- a/drivers/hwtracing/coresight/Kconfig
> > +++ b/drivers/hwtracing/coresight/Kconfig
> > @@ -110,4 +110,16 @@ config CORESIGHT_CPU_DEBUG
> > properly, please refer Documentation/trace/coresight-cpu-debug.rst
> > for detailed description and the example for usage.
> >
> > +config CORESIGHT_CTI
> > + bool "CoreSight Cross Trigger Interface (CTI) driver"
> > + depends on ARM || ARM64
> > + help
> > + This driver provides support for CoreSight CTI and CTM components.
> > + These provide hardware triggering events between CoreSight trace
> > + source and sink components. These can be used to halt trace or
> > + inject events into the trace stream. CTI also provides a software
> > + control to trigger the same halt events. This can provide fast trace
> > + halt compared to disabling sources and sinks normally in driver
> > + software.
> > +
> > endif
> > diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
> > index 3c0ac421e211..0e3e72f0f510 100644
> > --- a/drivers/hwtracing/coresight/Makefile
> > +++ b/drivers/hwtracing/coresight/Makefile
> > @@ -17,3 +17,6 @@ obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o \
> > obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o
> > obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o
> > obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
> > +obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o \
> > + coresight-cti-platform.o \
> > + coresight-cti-sysfs.o
> > diff --git a/drivers/hwtracing/coresight/coresight-cti-platform.c b/drivers/hwtracing/coresight/coresight-cti-platform.c
> > new file mode 100644
> > index 000000000000..665be86c585d
> > --- /dev/null
> > +++ b/drivers/hwtracing/coresight/coresight-cti-platform.c
> > @@ -0,0 +1,53 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2019, The Linaro Limited. All rights reserved.
> > + */
> > +
> > +#include <linux/of.h>
> > +
> > +#include "coresight-cti.h"
> > +
> > +/* get the hardware configuration & connection data. */
> > +int cti_plat_get_hw_data(struct device *dev,
> > + struct cti_drvdata *drvdata)
> > +{
> > + int rc = 0;
> > + struct cti_device *cti_dev = &drvdata->ctidev;
> > +
> > + /* if no connections, just add a single default based on max IN-OUT */
> > + if (cti_dev->nr_trig_con == 0)
> > + rc = cti_add_default_connection(dev, drvdata);
> > + return rc;
> > +}
> > +
> > +struct coresight_platform_data *
> > +coresight_cti_get_platform_data(struct device *dev)
> > +{
> > + int ret = -ENOENT;
> > + struct coresight_platform_data *pdata = NULL;
> > + struct fwnode_handle *fwnode = dev_fwnode(dev);
> > + struct cti_drvdata *drvdata = dev_get_drvdata(dev);
> > +
> > + if (IS_ERR_OR_NULL(fwnode))
> > + goto error;
> > +
> > + /*
> > + * Alloc platform data but leave it zero init. CTI does not use the
> > + * same connection infrastructuree as trace path components but an
> > + * empty struct enables us to use the standard coresight component
> > + * registration code.
> > + */
> > + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > + if (!pdata) {
> > + ret = -ENOMEM;
> > + goto error;
> > + }
> > +
> > + /* get some CTI specifics */
> > + ret = cti_plat_get_hw_data(dev, drvdata);
> > +
> > + if (!ret)
> > + return pdata;
> > +error:
> > + return ERR_PTR(ret);
> > +}
> > diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> > new file mode 100644
> > index 000000000000..a832b8c6b866
> > --- /dev/null
> > +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
> > @@ -0,0 +1,72 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2019 Linaro Limited, All rights reserved.
> > + * Author: Mike Leach <mike.leach@linaro.org>
> > + */
> > +
> > +#include <linux/coresight.h>
> > +
> > +#include "coresight-cti.h"
> > +
> > +/* basic attributes */
> > +static ssize_t enable_show(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + int enable_req;
> > + bool enabled, powered;
> > + struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
> > + ssize_t size = 0;
> > +
> > + enable_req = atomic_read(&drvdata->config.enable_req_count);
> > + spin_lock(&drvdata->spinlock);
> > + powered = drvdata->config.hw_powered;
> > + enabled = drvdata->config.hw_enabled;
> > + spin_unlock(&drvdata->spinlock);
> > +
> > + if (powered) {
> > + size = scnprintf(buf, PAGE_SIZE, "cti %s; powered;\n",
> > + enabled ? "enabled" : "disabled");
> > + } else {
> > + size = scnprintf(buf, PAGE_SIZE, "cti %s; unpowered;\n",
> > + enable_req ? "enable req" : "disabled");
> > + }
> > + return size;
> > +}
> > +
> > +static ssize_t enable_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t size)
> > +{
> > + int ret = 0;
> > + unsigned long val;
> > + struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
> > +
> > + ret = kstrtoul(buf, 0, &val);
> > + if (ret)
> > + return ret;
> > +
> > + if (val)
> > + ret = cti_enable(drvdata->csdev);
> > + else
> > + ret = cti_disable(drvdata->csdev);
> > + if (ret)
> > + return ret;
> > + return size;
> > +}
> > +static DEVICE_ATTR_RW(enable);
> > +
> > +/* attribute and group sysfs tables. */
> > +static struct attribute *coresight_cti_attrs[] = {
> > + &dev_attr_enable.attr,
> > + NULL,
> > +};
> > +
> > +static const struct attribute_group coresight_cti_group = {
> > + .attrs = coresight_cti_attrs,
> > +};
> > +
> > +const struct attribute_group *coresight_cti_groups[] = {
> > + &coresight_cti_group,
> > + NULL,
> > +};
> > diff --git a/drivers/hwtracing/coresight/coresight-cti.c b/drivers/hwtracing/coresight/coresight-cti.c
> > new file mode 100644
> > index 000000000000..7ae48bf62d17
> > --- /dev/null
> > +++ b/drivers/hwtracing/coresight/coresight-cti.c
> > @@ -0,0 +1,448 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2018 Linaro Limited, All rights reserved.
> > + * Author: Mike Leach <mike.leach@linaro.org>
> > + */
> > +
> > +#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 */
> > +LIST_HEAD(ect_net);
> > +
> > +/* protect the list */
> > +static DEFINE_MUTEX(ect_mutex);
> > +
> > +#define csdev_to_cti_drvdata(csdev) \
> > + dev_get_drvdata(csdev->dev.parent)
> > +
> > +/*
> > + * 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 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);
> > +}
> > +
> > +static void cti_enable_hw_smp_call(void *info)
> > +{
> > + struct cti_drvdata *drvdata = info;
> > +
> > + cti_write_all_hw_regs(drvdata);
> > +}
> > +
> > +/* write regs to hardware and enable */
> > +static int cti_enable_hw(struct cti_drvdata *drvdata)
> > +{
> > + struct cti_config *config = &drvdata->config;
> > + struct device *dev = &drvdata->csdev->dev;
> > + int rc = 0;
> > +
> > + pm_runtime_get_sync(dev->parent);
> > + spin_lock(&drvdata->spinlock);
> > +
> > + /* 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->base);
> > + if (rc)
> > + goto cti_err_not_enabled;
> > +
> > + if (drvdata->ctidev.cpu >= 0) {
> > + rc = smp_call_function_single(drvdata->ctidev.cpu,
> > + cti_enable_hw_smp_call,
> > + drvdata, 1);
> > + if (rc)
> > + goto cti_err_not_enabled;
> > + } else {
> > + cti_write_all_hw_regs(drvdata);
> > + }
> > +
> > + config->hw_enabled = true;
> > + atomic_inc(&drvdata->config.enable_req_count);
> > + spin_unlock(&drvdata->spinlock);
> > + return rc;
> > +
> > +cti_state_unchanged:
> > + atomic_inc(&drvdata->config.enable_req_count);
> > +
> > + /* cannot enable due to error */
> > +cti_err_not_enabled:
> > + spin_unlock(&drvdata->spinlock);
> > + pm_runtime_put(dev->parent);
> > + return rc;
> > +}
> > +
> > +/* disable hardware */
> > +static int cti_disable_hw(struct cti_drvdata *drvdata)
> > +{
> > + struct cti_config *config = &drvdata->config;
> > + struct device *dev = &drvdata->csdev->dev;
> > +
> > + spin_lock(&drvdata->spinlock);
> > +
> > + /* check refcount - disable on 0 */
> > + if (atomic_dec_return(&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(drvdata->base);
> > + CS_LOCK(drvdata->base);
> > + spin_unlock(&drvdata->spinlock);
> > + pm_runtime_put(dev);
> > + return 0;
> > +
> > + /* not disabled this call */
> > +cti_not_disabled:
> > + spin_unlock(&drvdata->spinlock);
> > + return 0;
> > +}
> > +
> > +/*
> > + * 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)((devid_val & 0xFF00) >> 8)
> > +
> > +/* DEVID[19:16] - number of CTM channels */
> > +#define CTI_DEVID_CTMCHANNELS(devid_val) (int)((devid_val & 0xF0000) >> 16)
> > +
> > +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);
> > + atomic_set(&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 = devm_kstrdup(dev,
> > + dev_name(&csdev->dev),
> > + GFP_KERNEL);
> > + else if (assoc_dev_name != NULL)
> > + tc->con_dev_name = devm_kstrdup(dev,
> > + assoc_dev_name, GFP_KERNEL);
> > + 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 ect operations **/
> > +int cti_enable(struct coresight_device *csdev)
> > +{
> > + struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
> > +
> > + /* enable hardware with refcount */
> > + return cti_enable_hw(drvdata);
> > +}
> > +
> > +int cti_disable(struct coresight_device *csdev)
> > +{
> > + struct cti_drvdata *drvdata = csdev_to_cti_drvdata(csdev);
> > +
> > + /* disable hardware with refcount */
> > + return cti_disable_hw(drvdata);
> > +}
> > +
> > +const struct coresight_ops_ect cti_ops_ect = {
> > + .enable = cti_enable,
> > + .disable = cti_disable,
> > +};
> > +
> > +const struct coresight_ops cti_ops = {
> > + .ect_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);
> > +
> > + /* 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 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) {
> > + ret = -ENOMEM;
> > + dev_info(dev, "%s, mem err\n", __func__);
> > + goto err_out;
> > + }
> > +
> > + /* Validity for the resource is already checked by the AMBA core */
> > + base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(base)) {
> > + ret = PTR_ERR(base);
> > + dev_info(dev, "%s, remap err\n", __func__);
> > + goto err_out;
> > + }
> > + drvdata->base = 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);
> > +
> > + /* Parse the .dts for connections and signals */
> > + pdata = coresight_cti_get_platform_data(dev);
>
> Here I would simply call cti_plat_get_hw_data() and not instantiate a *pdata.
> See below for more details.
>
> > + if (IS_ERR(pdata)) {
> > + dev_info(dev, "coresight_cti_get_platform_data err\n");
> > + ret = PTR_ERR(pdata);
> > + goto err_out;
> > + }
> > +
> > + /* 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) {
> > + ret = -ENOMEM;
> > + goto err_out;
> > + }
> > +
> > + /* set up coresight component description */
> > + cti_desc.pdata = pdata;
>
> Just set this to NULL and add a check in coresight_release_platform_data() that
> returns immediately if @pdata is NULL. The latter should be done in a separate
> patch preceding this one. If someone tries to do a cti_drvdata::csdev::pdata,
> we'll find out pretty quickly.
>
> With this:
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
>

pdata is used later in the generic coresight_register function. We
need it to pass to this with 0 connection ports as we define
connections differently - but we need to allow the rest of the common
infrastructure to keep working for us.

Regards

Mike

> > + cti_desc.type = CORESIGHT_DEV_TYPE_ECT;
> > + cti_desc.subtype.ect_subtype = CORESIGHT_DEV_SUBTYPE_ECT_CTI;
> > + cti_desc.ops = &cti_ops;
> > + cti_desc.groups = coresight_cti_groups;
> > + cti_desc.dev = dev;
> > + drvdata->csdev = coresight_register(&cti_desc);
> > + if (IS_ERR(drvdata->csdev)) {
> > + ret = PTR_ERR(drvdata->csdev);
> > + goto err_out;
> > + }
> > +
> > + /* add to list of CTI devices */
> > + mutex_lock(&ect_mutex);
> > + list_add(&drvdata->node, &ect_net);
> > + 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;
> > +
> > +err_out:
> > + 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},
> > +};
> > +
> > +static struct amba_driver cti_driver = {
> > + .drv = {
> > + .name = "coresight-cti",
> > + .owner = THIS_MODULE,
> > + .suppress_bind_attrs = true,
> > + },
> > + .probe = cti_probe,
> > + .id_table = cti_ids,
> > +};
> > +builtin_amba_driver(cti_driver);
> > diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
> > new file mode 100644
> > index 000000000000..e0d476533a82
> > --- /dev/null
> > +++ b/drivers/hwtracing/coresight/coresight-cti.h
> > @@ -0,0 +1,186 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2018 Linaro Limited, All rights reserved.
> > + * Author: Mike Leach <mike.leach@linaro.org>
> > + */
> > +
> > +#ifndef _CORESIGHT_CORESIGHT_CTI_H
> > +#define _CORESIGHT_CORESIGHT_CTI_H
> > +
> > +#include <asm/local.h>
> > +#include <linux/spinlock.h>
> > +#include "coresight-priv.h"
> > +
> > +/*
> > + * Device registers
> > + * 0x000 - 0x144: CTI programming and status
> > + * 0xEDC - 0xEF8: CTI integration test.
> > + * 0xF00 - 0xFFC: Coresight management registers.
> > + */
> > +/* CTI programming registers */
> > +#define CTICONTROL 0x000
> > +#define CTIINTACK 0x010
> > +#define CTIAPPSET 0x014
> > +#define CTIAPPCLEAR 0x018
> > +#define CTIAPPPULSE 0x01C
> > +#define CTIINEN(n) (0x020 + (4 * n))
> > +#define CTIOUTEN(n) (0x0A0 + (4 * n))
> > +#define CTITRIGINSTATUS 0x130
> > +#define CTITRIGOUTSTATUS 0x134
> > +#define CTICHINSTATUS 0x138
> > +#define CTICHOUTSTATUS 0x13C
> > +#define CTIGATE 0x140
> > +#define ASICCTL 0x144
> > +/* Integration test registers */
> > +#define ITCHINACK 0xEDC /* WO CTI CSSoc 400 only*/
> > +#define ITTRIGINACK 0xEE0 /* WO CTI CSSoc 400 only*/
> > +#define ITCHOUT 0xEE4 /* WO RW-600 */
> > +#define ITTRIGOUT 0xEE8 /* WO RW-600 */
> > +#define ITCHOUTACK 0xEEC /* RO CTI CSSoc 400 only*/
> > +#define ITTRIGOUTACK 0xEF0 /* RO CTI CSSoc 400 only*/
> > +#define ITCHIN 0xEF4 /* RO */
> > +#define ITTRIGIN 0xEF8 /* RO */
> > +/* management registers */
> > +#define CTIDEVAFF0 0xFA8
> > +#define CTIDEVAFF1 0xFAC
> > +
> > +/*
> > + * CTI CSSoc 600 has a max of 32 trigger signals per direction.
> > + * CTI CSSoc 400 has 8 IO triggers - other CTIs can be impl def.
> > + * Max of in and out defined in the DEVID register.
> > + * - pick up actual number used from .dts parameters if present.
> > + */
> > +#define CTIINOUTEN_MAX 32
> > +
> > +/**
> > + * Group of related trigger signals
> > + *
> > + * @nr_sigs: number of signals in the group.
> > + * @used_mask: bitmask representing the signal indexes in the group.
> > + * @sig_types: array of types for the signals, length nr_sigs.
> > + */
> > +struct cti_trig_grp {
> > + int nr_sigs;
> > + u32 used_mask;
> > + int sig_types[0];
> > +};
> > +
> > +/**
> > + * Trigger connection - connection between a CTI and other (coresight) device
> > + * lists input and output trigger signals for the device
> > + *
> > + * @con_in: connected CTIIN signals for the device.
> > + * @con_out: connected CTIOUT signals for the device.
> > + * @con_dev: coresight device connected to the CTI, NULL if not CS device
> > + * @con_dev_name: name of connected device (CS or CPU)
> > + * @node: entry node in list of connections.
> > + */
> > +struct cti_trig_con {
> > + struct cti_trig_grp *con_in;
> > + struct cti_trig_grp *con_out;
> > + struct coresight_device *con_dev;
> > + char *con_dev_name;
> > + struct list_head node;
> > +};
> > +
> > +/**
> > + * struct cti_device - description of CTI device properties.
> > + *
> > + * @nt_trig_con: Number of external devices connected to this device.
> > + * @ctm_id: which CTM this device is connected to (by default it is
> > + * assumed there is a single CTM per SoC, ID 0).
> > + * @trig_cons: list of connections to this device.
> > + * @cpu: CPU ID if associated with CPU, -1 otherwise.
> > + */
> > +struct cti_device {
> > + int nr_trig_con;
> > + u32 ctm_id;
> > + struct list_head trig_cons;
> > + int cpu;
> > +};
> > +
> > +/**
> > + * struct cti_config - configuration of the CTI device hardware
> > + *
> > + * @nr_trig_max: Max number of trigger signals implemented on device.
> > + * (max of trig_in or trig_out) - from ID register.
> > + * @nr_ctm_channels: number of available CTM channels - from ID register.
> > + * @enable_req_count: CTI is enabled alongside >=1 associated devices.
> > + * @hw_enabled: true if hw is currently enabled.
> > + * @hw_powered: true if associated cpu powered on, or no cpu.
> > + * @trig_in_use: bitfield of in triggers registered as in use.
> > + * @trig_out_use: bitfield of out triggers registered as in use.
> > + * @trig_out_filter: bitfield of out triggers that are blocked if filter
> > + * enabled. Typically this would be dbgreq / restart on
> > + * a core CTI.
> > + * @trig_filter_enable: 1 if filtering enabled.
> > + * @xtrig_rchan_sel: channel selection for xtrigger connection show.
> > + * @ctiappset: CTI Software application channel set.
> > + * @ctiinout_sel: register selector for INEN and OUTEN regs.
> > + * @ctiinen: enable input trigger to a channel.
> > + * @ctiouten: enable output trigger from a channel.
> > + * @ctigate: gate channel output from CTI to CTM.
> > + * @asicctl: asic control register.
> > + */
> > +struct cti_config {
> > + /* hardware description */
> > + int nr_ctm_channels;
> > + int nr_trig_max;
> > +
> > + /* cti enable control */
> > + atomic_t enable_req_count;
> > + bool hw_enabled;
> > + bool hw_powered;
> > +
> > + /* registered triggers and filtering */
> > + u32 trig_in_use;
> > + u32 trig_out_use;
> > + u32 trig_out_filter;
> > + bool trig_filter_enable;
> > + u8 xtrig_rchan_sel;
> > +
> > + /* cti cross trig programmable regs */
> > + u32 ctiappset;
> > + u8 ctiinout_sel;
> > + u32 ctiinen[CTIINOUTEN_MAX];
> > + u32 ctiouten[CTIINOUTEN_MAX];
> > + u32 ctigate;
> > + u32 asicctl;
> > +};
> > +
> > +/**
> > + * struct cti_drvdata - specifics for the CTI device
> > + * @base: Memory mapped base address for this component..
> > + * @csdev: Standard CoreSight device information.
> > + * @ctidev: Extra information needed by the CTI/CTM framework.
> > + * @spinlock: Control data access to one at a time.
> > + * @config: Configuration data for this CTI device.
> > + * @node: List entry of this device in the list of CTI devices.
> > + * @csdev_release: release function for underlying coresight_device.
> > + */
> > +struct cti_drvdata {
> > + void __iomem *base;
> > + struct coresight_device *csdev;
> > + struct cti_device ctidev;
> > + spinlock_t spinlock;
> > + struct cti_config config;
> > + struct list_head node;
> > + void (*csdev_release)(struct device *dev);
> > +};
> > +
> > +/* private cti driver fns & vars */
> > +extern const struct attribute_group *coresight_cti_groups[];
> > +int cti_add_default_connection(struct device *dev,
> > + struct cti_drvdata *drvdata);
> > +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_trig_con *cti_allocate_trig_con(struct device *dev, int in_sigs,
> > + int out_sigs);
> > +int cti_enable(struct coresight_device *csdev);
> > +int cti_disable(struct coresight_device *csdev);
> > +struct coresight_platform_data *
> > +coresight_cti_get_platform_data(struct device *dev);
> > +
> > +#endif /* _CORESIGHT_CORESIGHT_CTI_H */
> > diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> > index ef20f74c85fa..1a5fdf2710ff 100644
> > --- a/drivers/hwtracing/coresight/coresight.c
> > +++ b/drivers/hwtracing/coresight/coresight.c
> > @@ -955,6 +955,9 @@ static struct device_type coresight_dev_type[] = {
> > {
> > .name = "helper",
> > },
> > + {
> > + .name = "ect",
> > + },
> > };
> >
> > static void coresight_device_release(struct device *dev)
> > diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> > index 44e552de419c..b3e582d96a34 100644
> > --- a/include/linux/coresight.h
> > +++ b/include/linux/coresight.h
> > @@ -41,6 +41,7 @@ enum coresight_dev_type {
> > CORESIGHT_DEV_TYPE_LINKSINK,
> > CORESIGHT_DEV_TYPE_SOURCE,
> > CORESIGHT_DEV_TYPE_HELPER,
> > + CORESIGHT_DEV_TYPE_ECT,
> > };
> >
> > enum coresight_dev_subtype_sink {
> > @@ -68,6 +69,12 @@ enum coresight_dev_subtype_helper {
> > CORESIGHT_DEV_SUBTYPE_HELPER_CATU,
> > };
> >
> > +/* Embedded Cross Trigger (ECT) sub-types */
> > +enum coresight_dev_subtype_ect {
> > + CORESIGHT_DEV_SUBTYPE_ECT_NONE,
> > + CORESIGHT_DEV_SUBTYPE_ECT_CTI,
> > +};
> > +
> > /**
> > * union coresight_dev_subtype - further characterisation of a type
> > * @sink_subtype: type of sink this component is, as defined
> > @@ -78,6 +85,8 @@ enum coresight_dev_subtype_helper {
> > * by @coresight_dev_subtype_source.
> > * @helper_subtype: type of helper this component is, as defined
> > * by @coresight_dev_subtype_helper.
> > + * @ect_subtype: type of cross trigger this component is, as
> > + * defined by @coresight_dev_subtype_ect
> > */
> > union coresight_dev_subtype {
> > /* We have some devices which acts as LINK and SINK */
> > @@ -87,6 +96,7 @@ union coresight_dev_subtype {
> > };
> > enum coresight_dev_subtype_source source_subtype;
> > enum coresight_dev_subtype_helper helper_subtype;
> > + enum coresight_dev_subtype_ect ect_subtype;
> > };
> >
> > /**
> > @@ -196,6 +206,7 @@ static struct coresight_dev_list (var) = { \
> > #define sink_ops(csdev) csdev->ops->sink_ops
> > #define link_ops(csdev) csdev->ops->link_ops
> > #define helper_ops(csdev) csdev->ops->helper_ops
> > +#define ect_ops(csdev) csdev->ops->ect_ops
> >
> > /**
> > * struct coresight_ops_sink - basic operations for a sink
> > @@ -262,11 +273,23 @@ struct coresight_ops_helper {
> > int (*disable)(struct coresight_device *csdev, void *data);
> > };
> >
> > +/**
> > + * struct coresight_ops_ect - Ops for an embedded cross trigger device
> > + *
> > + * @enable : Enable the device
> > + * @disable : Disable the device
> > + */
> > +struct coresight_ops_ect {
> > + int (*enable)(struct coresight_device *csdev);
> > + int (*disable)(struct coresight_device *csdev);
> > +};
> > +
> > struct coresight_ops {
> > const struct coresight_ops_sink *sink_ops;
> > const struct coresight_ops_link *link_ops;
> > const struct coresight_ops_source *source_ops;
> > const struct coresight_ops_helper *helper_ops;
> > + const struct coresight_ops_ect *ect_ops;
> > };
> >
> > #ifdef CONFIG_CORESIGHT
> > --
> > 2.17.1
> >

--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK