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coresight-tpdm: Add CMB dataset support

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CMB (continuous multi-bit) is one of TPDM's dataset type. CMB subunit
can be enabled for data collection by writing 1 to the first bit of
CMB_CR register. This change is to add enable/disable function for
CMB dataset by writing CMB_CR register.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Jinlong Mao <quic_jinlmao@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1707024641-22460-5-git-send-email-quic_taozha@quicinc.com
This commit is contained in:
Tao Zhang 2024-02-04 13:30:35 +08:00 committed by Suzuki K Poulose
parent 4ed57f7589
commit a1705ffcce
2 changed files with 41 additions and 0 deletions
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28
drivers/hwtracing/coresight/coresight-tpdm.c
View File

@ -263,6 +263,19 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
}
static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
{
u32 val;
if (!tpdm_has_cmb_dataset(drvdata))
return;
val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
/* Set the enable bit of CMB control register to 1 */
val |= TPDM_CMB_CR_ENA;
writel_relaxed(val, drvdata->base + TPDM_CMB_CR);
}
/*
* TPDM enable operations
* The TPDM or Monitor serves as data collection component for various
@ -276,6 +289,7 @@ static void __tpdm_enable(struct tpdm_drvdata *drvdata)
CS_UNLOCK(drvdata->base);
tpdm_enable_dsb(drvdata);
tpdm_enable_cmb(drvdata);
CS_LOCK(drvdata->base);
}
@ -312,12 +326,26 @@ static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata)
writel_relaxed(val, drvdata->base + TPDM_DSB_CR);
}
static void tpdm_disable_cmb(struct tpdm_drvdata *drvdata)
{
u32 val;
if (!tpdm_has_cmb_dataset(drvdata))
return;
val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
/* Set the enable bit of CMB control register to 0 */
val &= ~TPDM_CMB_CR_ENA;
writel_relaxed(val, drvdata->base + TPDM_CMB_CR);
}
/* TPDM disable operations */
static void __tpdm_disable(struct tpdm_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
tpdm_disable_dsb(drvdata);
tpdm_disable_cmb(drvdata);
CS_LOCK(drvdata->base);
}

13
drivers/hwtracing/coresight/coresight-tpdm.h
View File

@ -9,6 +9,12 @@
/* The max number of the datasets that TPDM supports */
#define TPDM_DATASETS 7
/* CMB Subunit Registers */
#define TPDM_CMB_CR (0xA00)
/* Enable bit for CMB subunit */
#define TPDM_CMB_CR_ENA BIT(0)
/* DSB Subunit Registers */
#define TPDM_DSB_CR (0x780)
#define TPDM_DSB_TIER (0x784)
@ -79,10 +85,12 @@
*
* PERIPHIDR0[0] : Fix to 1 if ImplDef subunit present, else 0
* PERIPHIDR0[1] : Fix to 1 if DSB subunit present, else 0
* PERIPHIDR0[2] : Fix to 1 if CMB subunit present, else 0
*/
#define TPDM_PIDR0_DS_IMPDEF BIT(0)
#define TPDM_PIDR0_DS_DSB BIT(1)
#define TPDM_PIDR0_DS_CMB BIT(2)
#define TPDM_DSB_MAX_LINES 256
/* MAX number of EDCR registers */
@ -224,4 +232,9 @@ static bool tpdm_has_dsb_dataset(struct tpdm_drvdata *drvdata)
{
return (drvdata->datasets & TPDM_PIDR0_DS_DSB);
}
static bool tpdm_has_cmb_dataset(struct tpdm_drvdata *drvdata)
{
return (drvdata->datasets & TPDM_PIDR0_DS_CMB);
}
#endif /* _CORESIGHT_CORESIGHT_TPDM_H */