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Date: Tue, 19 Apr 2022 10:51:34 +0100
From: Mike Leach <mike.leach@...aro.org>
To: Mao Jinlong <quic_jinlmao@...cinc.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Leo Yan <leo.yan@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Tao Zhang <quic_taozha@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
Hao Zhang <quic_hazha@...cinc.com>,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v5 07/10] Coresight: Add TPDA link driver
Hi
On Tue, 12 Apr 2022 at 13:51, Mao Jinlong <quic_jinlmao@...cinc.com> wrote:
>
> TPDA(Trace, Profiling and Diagnostics Aggregator) is
> to provide packetization, funneling and timestamping of
> TPDM data. Multiple monitors are connected to different
> input ports of TPDA.This change is to add tpda
> enable/disable/probe functions for coresight tpda driver.
>
> - - - - - - - - - - - -
> | TPDM 0| | TPDM 1 | | TPDM 2|
> - - - - - - - - - - - -
> | | |
> |_ _ _ _ _ _ | _ _ _ _ |
> | | |
> | | |
> ------------------
> | TPDA |
> ------------------
>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
> ---
> drivers/hwtracing/coresight/Kconfig | 11 ++
> drivers/hwtracing/coresight/Makefile | 1 +
> drivers/hwtracing/coresight/coresight-tpda.c | 192 +++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpda.h | 32 ++++
> 4 files changed, 236 insertions(+)
> create mode 100644 drivers/hwtracing/coresight/coresight-tpda.c
> create mode 100644 drivers/hwtracing/coresight/coresight-tpda.h
>
> diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
> index 60248fef4089..317c5e7f4819 100644
> --- a/drivers/hwtracing/coresight/Kconfig
> +++ b/drivers/hwtracing/coresight/Kconfig
> @@ -223,4 +223,15 @@ config CORESIGHT_TPDM_INTEGRATION_TEST
> operation to facilitate integration testing and software bringup
> and/or to instrument topology discovery. The TPDM utilizes integration
> mode to accomplish integration testing and software bringup.
> +
> +config CORESIGHT_TPDA
> + tristate "CoreSight Trace, Profiling & Diagnostics Aggregator driver"
> + help
> + This driver provides support for configuring aggregator. This is
> + primarily useful for pulling the data sets from one or more
> + attached monitors and pushing the resultant data out. Multiple
> + monitors are connected on different input ports of TPDA.
> +
> + To compile this driver as a module, choose M here: the module will be
> + called coresight-tpda.
> endif
TDPA / TDPM are functionally linked - it does not make sense to
configure one without the other.
Kernel configuration should reflect this - as a minimum TDPM
configuration should select TDPA.
> diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
> index 6bb9b1746bc7..1712d82e7260 100644
> --- a/drivers/hwtracing/coresight/Makefile
> +++ b/drivers/hwtracing/coresight/Makefile
> @@ -26,5 +26,6 @@ obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o
> obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o
> obj-$(CONFIG_CORESIGHT_TRBE) += coresight-trbe.o
> obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o
> +obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o
> coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \
> coresight-cti-sysfs.o
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> new file mode 100644
> index 000000000000..9519990c68e2
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -0,0 +1,192 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/amba/bus.h>
> +#include <linux/bitmap.h>
> +#include <linux/coresight.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/fs.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +
> +#include "coresight-priv.h"
> +#include "coresight-tpda.h"
> +#include "coresight-trace-id.h"
> +
> +DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
> +
> +/* Settings pre enabling port control register */
> +static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
> +{
> + u32 val;
> +
> + val = readl_relaxed(drvdata->base + TPDA_CR);
> + val |= (drvdata->atid << 6);
> + writel_relaxed(val, drvdata->base + TPDA_CR);
> +}
> +
> +static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
> +{
> + u32 val;
> +
> + val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> + /* Enable the port */
> + val = val | BIT(0);
#define a constant in the header to use here.
> + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +}
> +
> +static void _tpda_enable(struct tpda_drvdata *drvdata, int port)
> +{
> + CS_UNLOCK(drvdata->base);
> +
> + if (!drvdata->enable)
> + tpda_enable_pre_port(drvdata);
> +
> + tpda_enable_port(drvdata, port);
> +
> + CS_LOCK(drvdata->base);
> +}
> +
> +static int tpda_enable(struct coresight_device *csdev, int inport, int outport)
> +{
> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> + mutex_lock(&drvdata->lock);
> + _tpda_enable(drvdata, inport);
> + drvdata->enable = true;
> + mutex_unlock(&drvdata->lock);
> +
> + dev_info(drvdata->dev, "TPDA inport %d enabled\n", inport);
> + return 0;
> +}
> +
> +static void _tpda_disable(struct tpda_drvdata *drvdata, int port)
> +{
> + u32 val;
> +
> + CS_UNLOCK(drvdata->base);
> +
> + val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
> + val = val & ~BIT(0);
use a #defined constant.
> + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
> +
> + CS_LOCK(drvdata->base);
> +}
> +
> +static void tpda_disable(struct coresight_device *csdev, int inport,
> + int outport)
> +{
> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> +
> + mutex_lock(&drvdata->lock);
> + _tpda_disable(drvdata, inport);
> + drvdata->enable = false;
> + mutex_unlock(&drvdata->lock);
> +
> + dev_info(drvdata->dev, "TPDA inport %d disabled\n", inport);
> +}
> +
> +static const struct coresight_ops_link tpda_link_ops = {
> + .enable = tpda_enable,
> + .disable = tpda_disable,
> +};
> +
> +static const struct coresight_ops tpda_cs_ops = {
> + .link_ops = &tpda_link_ops,
> +};
> +
> +static int tpda_init_default_data(struct tpda_drvdata *drvdata)
> +{
> + int atid;
> + /*
> + * TPDA must has a unique atid. This atid can uniquely
> + * identify the TPDM trace source connect to the TPDA.
> + */
> + atid = coresight_trace_id_get_system_id(coresight_get_trace_id_map());
> + if (atid < 0)
> + return atid;
> +
> + drvdata->atid = atid;
> + return 0;
> +}
> +
> +static int tpda_probe(struct amba_device *adev, const struct amba_id *id)
> +{
> + int ret;
> + struct device *dev = &adev->dev;
> + struct coresight_platform_data *pdata;
> + struct tpda_drvdata *drvdata;
> + struct coresight_desc desc = { 0 };
> +
> + pdata = coresight_get_platform_data(dev);
> + if (IS_ERR(pdata))
> + return PTR_ERR(pdata);
> + adev->dev.platform_data = pdata;
> +
> + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> + if (!drvdata)
> + return -ENOMEM;
> +
> + drvdata->dev = &adev->dev;
> + dev_set_drvdata(dev, drvdata);
> +
> + drvdata->base = devm_ioremap_resource(dev, &adev->res);
> + if (!drvdata->base)
> + return -ENOMEM;
> +
> + mutex_init(&drvdata->lock);
> +
> + ret = tpda_init_default_data(drvdata);
> + if (ret)
> + return ret;
> +
> + desc.name = coresight_alloc_device_name(&tpda_devs, dev);
> + if (!desc.name)
> + return -ENOMEM;
> + desc.type = CORESIGHT_DEV_TYPE_LINK;
> + desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
> + desc.ops = &tpda_cs_ops;
> + desc.pdata = adev->dev.platform_data;
> + desc.dev = &adev->dev;
> + drvdata->csdev = coresight_register(&desc);
> + if (IS_ERR(drvdata->csdev))
> + return PTR_ERR(drvdata->csdev);
> +
> + pm_runtime_put(&adev->dev);
> +
> + dev_dbg(drvdata->dev, "TPDA initialized\n");
> + return 0;
> +}
> +
> +/*
> + * Different TPDA has different periph id.
> + * The difference is 0-7 bits' value. So ignore 0-7 bits.
> + */
> +static struct amba_id tpda_ids[] = {
> + {
> + .id = 0x000f0f00,
> + .mask = 0x000fff00,
> + },
> + { 0, 0},
> +};
> +
> +static struct amba_driver tpda_driver = {
> + .drv = {
> + .name = "coresight-tpda",
> + .owner = THIS_MODULE,
> + .suppress_bind_attrs = true,
> + },
> + .probe = tpda_probe,
> + .id_table = tpda_ids,
> +};
> +
There is no code to release resources when this module is unloaded.
You need a .remove function, that as a minimum calls
coresight_unregister().
Regards
Mike
> +module_amba_driver(tpda_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver");
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h b/drivers/hwtracing/coresight/coresight-tpda.h
> new file mode 100644
> index 000000000000..6ac33b9c1ea4
> --- /dev/null
> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef _CORESIGHT_CORESIGHT_TPDA_H
> +#define _CORESIGHT_CORESIGHT_TPDA_H
> +
> +#define TPDA_CR (0x000)
> +#define TPDA_Pn_CR(n) (0x004 + (n * 4))
> +
> +#define TPDA_MAX_INPORTS 32
> +
> +/**
> + * struct tpda_drvdata - specifics associated to an TPDA component
> + * @base: memory mapped base address for this component.
> + * @dev: The device entity associated to this component.
> + * @csdev: component vitals needed by the framework.
> + * @lock: lock for the enable value.
> + * @enable: enable status of the component.
> + * @traceid: trace source identification for the data packet by TPDA.
> + */
> +struct tpda_drvdata {
> + void __iomem *base;
> + struct device *dev;
> + struct coresight_device *csdev;
> + struct mutex lock;
> + bool enable;
> + u32 atid;
> +};
> +
> +#endif /* _CORESIGHT_CORESIGHT_TPDA_H */
> --
> 2.17.1
>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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