diff options
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 12 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 3 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index b3bde2aec2b9..c8c7829f7046 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -164,6 +164,13 @@ static void etm4_enable_hw(void *info) writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0); writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1); + /* + * Request to keep the trace unit powered and also + * emulation of powerdown + */ + writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) | TRCPDCR_PU, + drvdata->base + TRCPDCR); + /* Enable the trace unit */ writel_relaxed(1, drvdata->base + TRCPRGCTLR); @@ -294,6 +301,11 @@ static void etm4_disable_hw(void *info) CS_UNLOCK(drvdata->base); + /* power can be removed from the trace unit now */ + control = readl_relaxed(drvdata->base + TRCPDCR); + control &= ~TRCPDCR_PU; + writel_relaxed(control, drvdata->base + TRCPDCR); + control = readl_relaxed(drvdata->base + TRCPRGCTLR); /* EN, bit[0] Trace unit enable bit */ diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index 5359c5197c1d..2629954429a1 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -183,6 +183,9 @@ #define TRCSTATR_IDLE_BIT 0 #define ETM_DEFAULT_ADDR_COMP 0 +/* PowerDown Control Register bits */ +#define TRCPDCR_PU BIT(3) + /* secure state access levels */ #define ETM_EXLEVEL_S_APP BIT(8) #define ETM_EXLEVEL_S_OS BIT(9) |