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authorSuzuki K Poulose <suzuki.poulose@arm.com>2018-09-20 22:18:15 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 21:09:19 +0300
commit4e33d694376e7f57d788e734dc96fdbd3c408768 (patch)
tree076114721a07b586626948309586fb9c979d9fd7 /drivers/hwtracing
parentf92201b1ab95b3f17c3fa9df8f88dc521e0b604f (diff)
downloadlinux-4e33d694376e7f57d788e734dc96fdbd3c408768.tar.xz
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>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-dynamic-replicator.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c
index 97f4673452cb..299667b887fc 100644
--- a/drivers/hwtracing/coresight/coresight-dynamic-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-dynamic-replicator.c
@@ -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");