diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-tmc-etf.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etf.c | 62 |
1 files changed, 61 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index 467d19221f7b..91e43572ce9f 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -71,7 +71,7 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) } } -void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) +static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata) { CS_UNLOCK(drvdata->base); @@ -202,3 +202,63 @@ const struct coresight_ops tmc_etf_cs_ops = { .sink_ops = &tmc_etf_sink_ops, .link_ops = &tmc_etf_link_ops, }; + +int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) +{ + enum tmc_mode mode; + int ret = 0; + unsigned long flags; + + /* config types are set a boot time and never change */ + if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && + drvdata->config_type != TMC_CONFIG_TYPE_ETF)) + return -EINVAL; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* There is no point in reading a TMC in HW FIFO mode */ + mode = readl_relaxed(drvdata->base + TMC_MODE); + if (mode != TMC_MODE_CIRCULAR_BUFFER) { + ret = -EINVAL; + goto out; + } + + /* Disable the TMC if need be */ + if (drvdata->enable) + tmc_etb_disable_hw(drvdata); + + drvdata->reading = true; +out: + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return ret; +} + +int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) +{ + enum tmc_mode mode; + unsigned long flags; + + /* config types are set a boot time and never change */ + if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && + drvdata->config_type != TMC_CONFIG_TYPE_ETF)) + return -EINVAL; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + /* There is no point in reading a TMC in HW FIFO mode */ + mode = readl_relaxed(drvdata->base + TMC_MODE); + if (mode != TMC_MODE_CIRCULAR_BUFFER) { + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return -EINVAL; + } + + /* Re-enable the TMC if need be */ + if (drvdata->enable) + tmc_etb_enable_hw(drvdata); + + drvdata->reading = false; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return 0; +} |