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[V3,02/18] coresight: tmc: waiting for TMCReady bit before programming

Message ID 1461345255-11758-3-git-send-email-mathieu.poirier@linaro.org
State Accepted
Commit 358f42184e97f9a216b927a5a744597b98e0eee1
Headers show

Commit Message

Mathieu Poirier April 22, 2016, 5:13 p.m. UTC 
According to the TRM before programming the TMC in circular
buffer mode (and that for any configuration, ETB, ETR, ETF),
the TMCReady bit in the status register has to be set.

This patch adds a check to make sure the state machine is in
a state where it can be configured, and complains otherwise.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

---
 drivers/hwtracing/coresight/coresight-tmc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

-- 
2.5.0
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Patch

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 3f646e29a99b..66fa7736d12f 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -180,6 +180,9 @@  static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
 
 	CS_UNLOCK(drvdata->base);
 
+	/* Wait for TMCSReady bit to be set */
+	tmc_wait_for_tmcready(drvdata);
+
 	writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
 	writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI |
 		       TMC_FFCR_FON_FLIN | TMC_FFCR_FON_TRIG_EVT |
@@ -201,6 +204,9 @@  static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
 
 	CS_UNLOCK(drvdata->base);
 
+	/* Wait for TMCSReady bit to be set */
+	tmc_wait_for_tmcready(drvdata);
+
 	writel_relaxed(drvdata->size / 4, drvdata->base + TMC_RSZ);
 	writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
 
@@ -230,6 +236,9 @@  static void tmc_etf_enable_hw(struct tmc_drvdata *drvdata)
 {
 	CS_UNLOCK(drvdata->base);
 
+	/* Wait for TMCSReady bit to be set */
+	tmc_wait_for_tmcready(drvdata);
+
 	writel_relaxed(TMC_MODE_HARDWARE_FIFO, drvdata->base + TMC_MODE);
 	writel_relaxed(TMC_FFCR_EN_FMT | TMC_FFCR_EN_TI,
 		       drvdata->base + TMC_FFCR);