blob: 5f82737c37bba5b063c8a80c86e78227b7759cc9 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/amba/bus.h>
#include <linux/bitfield.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");
static bool coresight_device_is_tpdm(struct coresight_device *csdev)
{
return (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) &&
(csdev->subtype.source_subtype ==
CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
}
/*
* Read the DSB element size from the TPDM device
* Returns
* The dsb element size read from the devicetree if available.
* 0 - Otherwise, with a warning once.
*/
static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
{
int rc = 0;
u8 size = 0;
rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
"qcom,dsb-element-size", &size);
if (rc)
dev_warn_once(&csdev->dev,
"Failed to read TPDM DSB Element size: %d\n", rc);
return size;
}
/*
* Search and read element data size from the TPDM node in
* the devicetree. Each input port of TPDA is connected to
* a TPDM. Different TPDM supports different types of dataset,
* and some may support more than one type of dataset.
* Parameter "inport" is used to pass in the input port number
* of TPDA, and it is set to -1 in the recursize call.
*/
static int tpda_get_element_size(struct coresight_device *csdev,
int inport)
{
int dsb_size = -ENOENT;
int i, size;
struct coresight_device *in;
for (i = 0; i < csdev->pdata->nr_inconns; i++) {
in = csdev->pdata->in_conns[i]->src_dev;
if (!in)
continue;
/* Ignore the paths that do not match port */
if (inport > 0 &&
csdev->pdata->in_conns[i]->dest_port != inport)
continue;
if (coresight_device_is_tpdm(in)) {
size = tpdm_read_dsb_element_size(in);
} else {
/* Recurse down the path */
size = tpda_get_element_size(in, -1);
}
if (size < 0)
return size;
if (dsb_size < 0) {
/* Found a size, save it. */
dsb_size = size;
} else {
/* Found duplicate TPDMs */
return -EEXIST;
}
}
return dsb_size;
}
/* 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 &= ~TPDA_CR_ATID;
val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid);
writel_relaxed(val, drvdata->base + TPDA_CR);
}
static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
{
u32 val;
int size;
val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
/*
* Configure aggregator port n DSB data set element size
* Set the bit to 0 if the size is 32
* Set the bit to 1 if the size is 64
*/
size = tpda_get_element_size(drvdata->csdev, port);
switch (size) {
case 32:
val &= ~TPDA_Pn_CR_DSBSIZE;
break;
case 64:
val |= TPDA_Pn_CR_DSBSIZE;
break;
case 0:
return -EEXIST;
case -EEXIST:
dev_warn_once(&drvdata->csdev->dev,
"Detected multiple TPDMs on port %d", -EEXIST);
return -EEXIST;
default:
return -EINVAL;
}
/* Enable the port */
val |= TPDA_Pn_CR_ENA;
writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
return 0;
}
static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
{
int ret;
CS_UNLOCK(drvdata->base);
if (!drvdata->csdev->enable)
tpda_enable_pre_port(drvdata);
ret = tpda_enable_port(drvdata, port);
CS_LOCK(drvdata->base);
return ret;
}
static int tpda_enable(struct coresight_device *csdev,
struct coresight_connection *in,
struct coresight_connection *out)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret = 0;
spin_lock(&drvdata->spinlock);
if (atomic_read(&in->dest_refcnt) == 0) {
ret = __tpda_enable(drvdata, in->dest_port);
if (!ret) {
atomic_inc(&in->dest_refcnt);
dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
}
}
spin_unlock(&drvdata->spinlock);
return ret;
}
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 &= ~TPDA_Pn_CR_ENA;
writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
CS_LOCK(drvdata->base);
}
static void tpda_disable(struct coresight_device *csdev,
struct coresight_connection *in,
struct coresight_connection *out)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
spin_lock(&drvdata->spinlock);
if (atomic_dec_return(&in->dest_refcnt) == 0)
__tpda_disable(drvdata, in->dest_port);
spin_unlock(&drvdata->spinlock);
dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", in->dest_port);
}
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 connected to the TPDA.
* The TPDMs which are connected to same TPDA share the
* same trace-id. When TPDA does packetization, different
* port will have unique channel number for decoding.
*/
atid = coresight_trace_id_get_system_id();
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 };
void __iomem *base;
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);
base = devm_ioremap_resource(dev, &adev->res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
spin_lock_init(&drvdata->spinlock);
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;
desc.access = CSDEV_ACCESS_IOMEM(base);
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;
}
static void tpda_remove(struct amba_device *adev)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev);
coresight_trace_id_put_system_id(drvdata->atid);
coresight_unregister(drvdata->csdev);
}
/*
* 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,
.remove = tpda_remove,
.id_table = tpda_ids,
};
module_amba_driver(tpda_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver");