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authorSuzuki K. Poulose <suzuki.poulose@arm.com>2015-03-18 15:24:40 +0300
committerWill Deacon <will.deacon@arm.com>2015-03-27 16:44:35 +0300
commit772742a6c7ea4612fe043353531e6435ed33e719 (patch)
tree947c0f53161efdec39acab32c6cc246d33f2ee8f /drivers/bus/arm-cci.c
parentfc17c839448e498393009e06ca30a204eefaccee (diff)
downloadlinux-772742a6c7ea4612fe043353531e6435ed33e719.tar.xz
arm-cci: Get rid of secure transactions for PMU driver
Avoid secure transactions while probing the CCI PMU. The existing code makes use of the Peripheral ID2 (PID2) register to determine the revision of the CCI400, which requires a secure transaction. This puts a limitation on the usage of the driver on systems running non-secure Linux(e.g, ARM64). Updated the device-tree binding for cci pmu node to add the explicit revision number for the compatible field. The supported strings are : arm,cci-400-pmu,r0 arm,cci-400-pmu,r1 arm,cci-400-pmu - DEPRECATED. See NOTE below NOTE: If the revision is not mentioned, we need to probe the cci revision, which could be fatal on a platform running non-secure. We need a reliable way to know if we can poke the CCI registers at runtime on ARM32. We depend on 'mcpm_is_available()' when it is available. mcpm_is_available() returns true only when there is a registered driver for mcpm. Otherwise, we assume that we don't have secure access, and skips probing the revision number(ARM64 case). The MCPM should figure out if it is safe to access the CCI. Unfortunately there isn't a reliable way to indicate the same via dtb. This patch doesn't address/change the current situation. It only deals with the CCI-PMU, leaving the assumptions about the secure access as it has been, prior to this patch. Cc: devicetree@vger.kernel.org Cc: Punit Agrawal <punit.agrawal@arm.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> 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/arm-cci.c')
-rw-r--r--drivers/bus/arm-cci.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index ae3864d95e6c..a23663c7a306 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -217,7 +217,9 @@ static int probe_cci_revision(void)
static const struct cci_pmu_model *probe_cci_model(struct platform_device *pdev)
{
- return &cci_pmu_models[probe_cci_revision()];
+ if (platform_has_secure_cci_access())
+ return &cci_pmu_models[probe_cci_revision()];
+ return NULL;
}
static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)
@@ -882,6 +884,15 @@ static struct cci_pmu_model cci_pmu_models[] = {
static const struct of_device_id arm_cci_pmu_matches[] = {
{
.compatible = "arm,cci-400-pmu",
+ .data = NULL,
+ },
+ {
+ .compatible = "arm,cci-400-pmu,r0",
+ .data = &cci_pmu_models[CCI_REV_R0],
+ },
+ {
+ .compatible = "arm,cci-400-pmu,r1",
+ .data = &cci_pmu_models[CCI_REV_R1],
},
{},
};
@@ -892,7 +903,11 @@ static inline const struct cci_pmu_model *get_cci_model(struct platform_device *
pdev->dev.of_node);
if (!match)
return NULL;
+ if (match->data)
+ return match->data;
+ dev_warn(&pdev->dev, "DEPRECATED compatible property,"
+ "requires secure access to CCI registers");
return probe_cci_model(pdev);
}