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coresight-tpda: Add DSB dataset support

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Read the DSB element size from the device tree. Set the register
bit that controls the DSB element size of the corresponding port.

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1695882586-10306-5-git-send-email-quic_taozha@quicinc.com
This commit is contained in:
Tao Zhang 2023-09-28 14:29:37 +08:00 committed by Suzuki K Poulose
parent f7f965c982
commit 57e7235aa1
2 changed files with 118 additions and 10 deletions
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126
drivers/hwtracing/coresight/coresight-tpda.c
View file

@ -21,6 +21,80 @@
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)
{
@ -32,26 +106,55 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDA_CR);
}
static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
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 void __tpda_enable(struct tpda_drvdata *drvdata, int port)
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);
tpda_enable_port(drvdata, port);
ret = tpda_enable_port(drvdata, port);
CS_LOCK(drvdata->base);
return ret;
}
static int tpda_enable(struct coresight_device *csdev,
@ -59,16 +162,19 @@ static int tpda_enable(struct coresight_device *csdev,
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)
__tpda_enable(drvdata, in->dest_port);
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);
}
}
atomic_inc(&in->dest_refcnt);
spin_unlock(&drvdata->spinlock);
dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port);
return 0;
return ret;
}
static void __tpda_disable(struct tpda_drvdata *drvdata, int port)

2
drivers/hwtracing/coresight/coresight-tpda.h
View file

@ -10,6 +10,8 @@
#define TPDA_Pn_CR(n) (0x004 + (n * 4))
/* Aggregator port enable bit */
#define TPDA_Pn_CR_ENA BIT(0)
/* Aggregator port DSB data set element size bit */
#define TPDA_Pn_CR_DSBSIZE BIT(8)
#define TPDA_MAX_INPORTS 32