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coresight: dynamic-replicator: Claim device for use 

Use CLAIM protocol to make sure the device is available for use.

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 13:18:15 -06:00 committed by Greg Kroah-Hartman
parent f92201b1ab
commit 4e33d69437
1 changed files with 18 additions and 5 deletions
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23
drivers/hwtracing/coresight/coresight-dynamic-replicator.c
View File

@ -41,8 +41,11 @@ static void replicator_reset(struct replicator_state *drvdata)
{
CS_UNLOCK(drvdata->base);
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
if (!coresight_claim_device_unlocked(drvdata->base)) {
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
coresight_disclaim_device_unlocked(drvdata->base);
}
CS_LOCK(drvdata->base);
}
@ -50,6 +53,7 @@ static void replicator_reset(struct replicator_state *drvdata)
static int replicator_enable(struct coresight_device *csdev, int inport,
int outport)
{
int rc = 0;
u32 reg;
struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
@ -67,13 +71,19 @@ static int replicator_enable(struct coresight_device *csdev, int inport,
CS_UNLOCK(drvdata->base);
if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
rc = coresight_claim_device_unlocked(drvdata->base);
/* Ensure that the outport is enabled. */
writel_relaxed(0x00, drvdata->base + reg);
if (!rc) {
writel_relaxed(0x00, drvdata->base + reg);
dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
}
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "REPLICATOR enabled\n");
return 0;
return rc;
}
static void replicator_disable(struct coresight_device *csdev, int inport,
@ -99,6 +109,9 @@ static void replicator_disable(struct coresight_device *csdev, int inport,
/* disable the flow of ATB data through port */
writel_relaxed(0xff, drvdata->base + reg);
if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
coresight_disclaim_device_unlocked(drvdata->base);
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "REPLICATOR disabled\n");