arm-cci: Split the code for PMU vs driver support

This patch separates the PMU driver code from the low level
CCI driver code and enables the PMU driver for ARM64.

Introduces config options for both.

 ARM_CCI400_PORT_CTRL	- controls the low level driver code for
			  CCI400 ports.
 ARM_CCI400_PMU		- controls the PMU driver code
 ARM_CCI400_COMMON	- Common defintions for CCI400

This patch also changes:
 ARM_CCI - common code for probing the CCI devices. This can be
   used for adding support for newer CCI versions(e.g, CCI-500).

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Abhilash Kesavan <a.kesavan@samsung.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

2 files changed, 44 insertions, 8 deletions

diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e36860..79e297b1f221 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -43,12 +43,32 @@ config OMAP_INTERCONNECT
 	help
 	  Driver to enable OMAP interconnect error handling driver.
 
-config ARM_CCI
-	bool "ARM CCI driver support"
+config ARM_CCI400_PORT_CTRL
+	bool
 	depends on ARM && OF && CPU_V7
+	select ARM_CCI400_COMMON
+	help
+	  Low level power management driver for CCI400 cache coherent
+	  interconnect for ARM platforms.
+
+config ARM_CCI400_PMU
+	bool "ARM CCI400 PMU support"
+	default y
+	depends on ARM || ARM64
+	depends on HW_PERF_EVENTS
+	select ARM_CCI400_COMMON
 	help
-	  Driver supporting the CCI cache coherent interconnect for ARM
-	  platforms.
+	  Support for PMU events monitoring on the ARM CCI cache coherent
+	  interconnect.
+
+	  If unsure, say Y
+
+config ARM_CCI400_COMMON
+	bool
+	select ARM_CCI
+
+config ARM_CCI
+	bool
 
 config ARM_CCN
 	bool "ARM CCN driver support"
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index a23663c7a306..054df84562c2 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -32,6 +32,7 @@
 static void __iomem *cci_ctrl_base;
 static unsigned long cci_ctrl_phys;
 
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
 struct cci_nb_ports {
 	unsigned int nb_ace;
 	unsigned int nb_ace_lite;
@@ -42,12 +43,19 @@ static const struct cci_nb_ports cci400_ports = {
 	.nb_ace_lite = 3
 };
 
+#define CCI400_PORTS_DATA	(&cci400_ports)
+#else
+#define CCI400_PORTS_DATA	(NULL)
+#endif
+
 static const struct of_device_id arm_cci_matches[] = {
-	{.compatible = "arm,cci-400", .data = &cci400_ports },
+#ifdef CONFIG_ARM_CCI400_COMMON
+	{.compatible = "arm,cci-400", .data = CCI400_PORTS_DATA },
+#endif
 	{},
 };
 
-#ifdef CONFIG_HW_PERF_EVENTS
+#ifdef CONFIG_ARM_CCI400_PMU
 
 #define DRIVER_NAME		"CCI-400"
 #define DRIVER_NAME_PMU		DRIVER_NAME " PMU"
@@ -1022,14 +1030,16 @@ static int __init cci_platform_init(void)
 	return platform_driver_register(&cci_platform_driver);
 }
 
-#else /* !CONFIG_HW_PERF_EVENTS */
+#else /* !CONFIG_ARM_CCI400_PMU */
 
 static int __init cci_platform_init(void)
 {
 	return 0;
 }
 
-#endif /* CONFIG_HW_PERF_EVENTS */
+#endif /* CONFIG_ARM_CCI400_PMU */
+
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
 
 #define CCI_PORT_CTRL		0x0
 #define CCI_CTRL_STATUS		0xc
@@ -1460,6 +1470,12 @@ static int cci_probe_ports(struct device_node *np)
 
 	return 0;
 }
+#else /* !CONFIG_ARM_CCI400_PORT_CTRL */
+static inline int cci_probe_ports(struct device_node *np)
+{
+	return 0;
+}
+#endif /* CONFIG_ARM_CCI400_PORT_CTRL */
 
 static int cci_probe(void)
 {