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coresight: funnel: Claim devices before use

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Use the CLAIM protocol to grab the ownership of the component.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:18:13 -06:00 • committed by Greg Kroah-Hartman
parent 68a147752d
commit f13d7c0835
1 changed files with 21 additions and 5 deletions
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26
drivers/hwtracing/coresight/coresight-funnel.c
View file

@ -25,6 +25,7 @@
#define FUNNEL_HOLDTIME_MASK 0xf00
#define FUNNEL_HOLDTIME_SHFT 0x8
#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
#define FUNNEL_ENSx_MASK 0xff
/**
* struct funnel_drvdata - specifics associated to a funnel component
@ -42,31 +43,42 @@ struct funnel_drvdata {
unsigned long priority;
};
static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
static int funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
{
u32 functl;
int rc = 0;
CS_UNLOCK(drvdata->base);
functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
/* Claim the device only when we enable the first slave */
if (!(functl & FUNNEL_ENSx_MASK)) {
rc = coresight_claim_device_unlocked(drvdata->base);
if (rc)
goto done;
}
functl &= ~FUNNEL_HOLDTIME_MASK;
functl |= FUNNEL_HOLDTIME;
functl |= (1 << port);
writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
done:
CS_LOCK(drvdata->base);
return rc;
}
static int funnel_enable(struct coresight_device *csdev, int inport,
int outport)
{
int rc;
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
funnel_enable_hw(drvdata, inport);
rc = funnel_enable_hw(drvdata, inport);
dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
return 0;
if (!rc)
dev_dbg(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
return rc;
}
static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
@ -79,6 +91,10 @@ static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
functl &= ~(1 << inport);
writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
/* Disclaim the device if none of the slaves are now active */
if (!(functl & FUNNEL_ENSx_MASK))
coresight_disclaim_device_unlocked(drvdata->base);
CS_LOCK(drvdata->base);
}