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-rw-r--r--Documentation/devicetree/bindings/arm/cci.txt7
-rw-r--r--arch/arm/include/asm/arm-cci.h42
-rw-r--r--arch/arm64/include/asm/arm-cci.h27
-rw-r--r--drivers/bus/arm-cci.c17
-rw-r--r--include/linux/arm-cci.h2
5 files changed, 92 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/arm/cci.txt b/Documentation/devicetree/bindings/arm/cci.txt
index f28d82bbbc56..3c5c631328d3 100644
--- a/Documentation/devicetree/bindings/arm/cci.txt
+++ b/Documentation/devicetree/bindings/arm/cci.txt
@@ -94,8 +94,11 @@ specific to ARM.
- compatible
Usage: required
Value type: <string>
- Definition: must be "arm,cci-400-pmu"
-
+ Definition: Must contain one of:
+ "arm,cci-400-pmu,r0"
+ "arm,cci-400-pmu,r1"
+ "arm,cci-400-pmu" - DEPRECATED, permitted only where OS has
+ secure acces to CCI registers
- reg:
Usage: required
Value type: Integer cells. A register entry, expressed
diff --git a/arch/arm/include/asm/arm-cci.h b/arch/arm/include/asm/arm-cci.h
new file mode 100644
index 000000000000..fe77f7ab7e6b
--- /dev/null
+++ b/arch/arm/include/asm/arm-cci.h
@@ -0,0 +1,42 @@
+/*
+ * arch/arm/include/asm/arm-cci.h
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_CCI_H
+#define __ASM_ARM_CCI_H
+
+#ifdef CONFIG_MCPM
+#include <asm/mcpm.h>
+
+/*
+ * We don't have a reliable way of detecting whether,
+ * if we have access to secure-only registers, unless
+ * mcpm is registered.
+ */
+static inline bool platform_has_secure_cci_access(void)
+{
+ return mcpm_is_available();
+}
+
+#else
+static inline bool platform_has_secure_cci_access(void)
+{
+ return false;
+}
+#endif
+
+#endif
diff --git a/arch/arm64/include/asm/arm-cci.h b/arch/arm64/include/asm/arm-cci.h
new file mode 100644
index 000000000000..f0b63712e10e
--- /dev/null
+++ b/arch/arm64/include/asm/arm-cci.h
@@ -0,0 +1,27 @@
+/*
+ * arch/arm64/include/asm/arm-cci.h
+ *
+ * Copyright (C) 2015 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_CCI_H
+#define __ASM_ARM_CCI_H
+
+static inline bool platform_has_secure_cci_access(void)
+{
+ return false;
+}
+
+#endif
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);
}
diff --git a/include/linux/arm-cci.h b/include/linux/arm-cci.h
index 79d6edf446d5..aede5c765eec 100644
--- a/include/linux/arm-cci.h
+++ b/include/linux/arm-cci.h
@@ -24,6 +24,8 @@
#include <linux/errno.h>
#include <linux/types.h>
+#include <asm/arm-cci.h>
+
struct device_node;
#ifdef CONFIG_ARM_CCI