// 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"
#include "coresight-tpdm.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);
}
static void tpda_clear_element_size(struct coresight_device *csdev)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
drvdata->dsb_esize = 0;
drvdata->cmb_esize = 0;
}
static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val)
{
/* Clear all relevant fields */
*val &= ~(TPDA_Pn_CR_DSBSIZE | TPDA_Pn_CR_CMBSIZE);
if (drvdata->dsb_esize == 64)
*val |= TPDA_Pn_CR_DSBSIZE;
else if (drvdata->dsb_esize == 32)
*val &= ~TPDA_Pn_CR_DSBSIZE;
if (drvdata->cmb_esize == 64)
*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
else if (drvdata->cmb_esize == 32)
*val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
else if (drvdata->cmb_esize == 8)
*val &= ~TPDA_Pn_CR_CMBSIZE;
}
/*
* Read the element size from the TPDM device. One TPDM must have at least one of the
* element size property.
* Returns
* 0 - The element size property is read
* Others - Cannot read the property of the element size
*/
static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
struct coresight_device *csdev)
{
int rc = -EINVAL;
struct tpdm_drvdata *tpdm_data = dev_get_drvdata(csdev->dev.parent);
if (tpdm_has_dsb_dataset(tpdm_data)) {
rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent),
"qcom,dsb-element-bits", &drvdata->dsb_esize);
}
if (tpdm_has_cmb_dataset(tpdm_data)) {
rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent),
"qcom,cmb-element-bits", &drvdata->cmb_esize);
}
if (rc)
dev_warn_once(&csdev->dev,
"Failed to read TPDM Element size: %d\n", rc);
return rc;
}
/*
* 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 tpda_drvdata *drvdata,
struct coresight_device *csdev,
int inport)
{
int rc = 0;
int i;
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)) {
if (drvdata->dsb_esize || drvdata->cmb_esize)
return -EEXIST;
rc = tpdm_read_element_size(drvdata, in);
if (rc)
return rc;
} else {
/* Recurse down the path */
rc = tpda_get_element_size(drvdata, in, -1);
if (rc)
return rc;
}
}
return rc;
}
/* 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 rc;
val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
tpda_clear_element_size(drvdata->csdev);
rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
if (!rc && (drvdata->dsb_esize || drvdata->cmb_esize)) {
tpda_set_element_size(drvdata, &val);
/* Enable the port */
val |= TPDA_Pn_CR_ENA;
writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
} else if (rc == -EEXIST)
dev_warn_once(&drvdata->csdev->dev,
"Detected multiple TPDMs on port %d", port);
else
dev_warn_once(&drvdata->csdev->dev,
"Didn't find TPDM element size");
return rc;
}
static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
{
int ret;
CS_UNLOCK(drvdata->base);
/*
* Only do pre-port enable for first port that calls enable when the
* device's main refcount is still 0
*/
lockdep_assert_held(&drvdata->spinlock);
if (!drvdata->csdev->refcnt)
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);
csdev->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);
csdev->refcnt--;
}
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, NULL },
};
static struct amba_driver tpda_driver = {
.drv = {
.name = "coresight-tpda",
.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");
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