diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc-etr.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etr.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 5d9333ec49ae..3483d139a4ac 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -70,7 +70,7 @@ static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata) drvdata->buf = drvdata->vaddr; } -void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) +static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -126,3 +126,43 @@ static const struct coresight_ops_sink tmc_etr_sink_ops = { const struct coresight_ops tmc_etr_cs_ops = { .sink_ops = &tmc_etr_sink_ops, }; + +int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) +{ + unsigned long flags; + + /* config types are set a boot time and never change */ + if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) + return -EINVAL; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* Disable the TMC if need be */ + if (drvdata->enable) + tmc_etr_disable_hw(drvdata); + + drvdata->reading = true; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return 0; +} + +int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) +{ + unsigned long flags; + + /* config types are set a boot time and never change */ + if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) + return -EINVAL; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* RE-enable the TMC if need be */ + if (drvdata->enable) + tmc_etr_enable_hw(drvdata); + + drvdata->reading = false; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return 0; +} |