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authorSuzuki K Poulose <suzuki.poulose@arm.com>2016-02-23 10:49:46 +0000
committerWill Deacon <will.deacon@arm.com>2016-02-29 23:23:16 +0000
commita077c52f349fdeeccc3f9f3590d63fe2b116b9a5 (patch)
treebe850afe48fc24dfaef0dc8145e2bd9e03f3b8d5 /drivers/bus
parenta53eb5c62f214a72e00775126a3bbd11579e2969 (diff)
downloadlinux-a077c52f349fdeeccc3f9f3590d63fe2b116b9a5.tar.bz2
arm-cci: Refactor CCI PMU enable/disable methods
This patch refactors the CCI PMU driver code a little bit to make it easier share the code for enabling/disabling the CCI PMU. This will be used by the hooks to work around the special cases where writing to a counter is not always that easy(e.g, CCI-500) No functional changes. Cc: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/arm-cci.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index 6a76ac76fb8b..e42842be8edc 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -606,6 +606,26 @@ static int cci500_validate_hw_event(struct cci_pmu *cci_pmu,
}
#endif /* CONFIG_ARM_CCI500_PMU */
+/* Should be called with cci_pmu->hw_events->pmu_lock held */
+static void __cci_pmu_enable(void)
+{
+ u32 val;
+
+ /* Enable all the PMU counters. */
+ val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
+ writel(val, cci_ctrl_base + CCI_PMCR);
+}
+
+/* Should be called with cci_pmu->hw_events->pmu_lock held */
+static void __cci_pmu_disable(void)
+{
+ u32 val;
+
+ /* Disable all the PMU counters. */
+ val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
+ writel(val, cci_ctrl_base + CCI_PMCR);
+}
+
static ssize_t cci_pmu_format_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -895,16 +915,12 @@ static void cci_pmu_enable(struct pmu *pmu)
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_cntrs);
unsigned long flags;
- u32 val;
if (!enabled)
return;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
-
- /* Enable all the PMU counters. */
- val = readl_relaxed(cci_ctrl_base + CCI_PMCR) | CCI_PMCR_CEN;
- writel(val, cci_ctrl_base + CCI_PMCR);
+ __cci_pmu_enable();
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}
@@ -914,13 +930,9 @@ static void cci_pmu_disable(struct pmu *pmu)
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
unsigned long flags;
- u32 val;
raw_spin_lock_irqsave(&hw_events->pmu_lock, flags);
-
- /* Disable all the PMU counters. */
- val = readl_relaxed(cci_ctrl_base + CCI_PMCR) & ~CCI_PMCR_CEN;
- writel(val, cci_ctrl_base + CCI_PMCR);
+ __cci_pmu_disable();
raw_spin_unlock_irqrestore(&hw_events->pmu_lock, flags);
}