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coresight: tmc: waiting for TMCReady bit before programming

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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 <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Mathieu Poirier 2016-05-03 11:33:45 -06:00 • committed by Greg Kroah-Hartman
commit 358f42184e
1 changed files with 9 additions and 0 deletions
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9
drivers/hwtracing/coresight/coresight-tmc.c
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@ -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);