drivers/bus: Split Arm CCI driver

The arm-cci driver is really two entirely separate drivers; one for MCPM
port control and the other for the performance monitors. Since they are
already relatively self-contained, let's take the plunge and move the
PMU parts out to drivers/perf where they belong these days. For non-MCPM
systems this leaves a small dependency on the remaining "bus" stub for
initial probing and discovery, but we end up with something that still
fits the general pattern of its fellow system PMU drivers to ease future
maintenance.

Moving code to a new file also offers a perfect excuse to modernise the
license/copyright headers and clean up some funky linewraps on the way.

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Suzuki Poulose <suzuki.poulose@arm.com>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/bus/Kconfig

@@ -8,25 +8,10 @@ menu "Bus devices"
 config ARM_CCI
 	bool
 
-config ARM_CCI_PMU
-	bool
-	select ARM_CCI
-
 config ARM_CCI400_COMMON
 	bool
 	select ARM_CCI
 
-config ARM_CCI400_PMU
-	bool "ARM CCI400 PMU support"
-	depends on (ARM && CPU_V7) || ARM64
-	depends on PERF_EVENTS
-	select ARM_CCI400_COMMON
-	select ARM_CCI_PMU
-	help
-	  Support for PMU events monitoring on the ARM CCI-400 (cache coherent
-	  interconnect). CCI-400 supports counting events related to the
-	  connected slave/master interfaces.
-
 config ARM_CCI400_PORT_CTRL
 	bool
 	depends on ARM && OF && CPU_V7
@@ -35,19 +20,6 @@ config ARM_CCI400_PORT_CTRL
 	  Low level power management driver for CCI400 cache coherent
 	  interconnect for ARM platforms.
 
-config ARM_CCI5xx_PMU
-	bool "ARM CCI-500/CCI-550 PMU support"
-	depends on (ARM && CPU_V7) || ARM64
-	depends on PERF_EVENTS
-	select ARM_CCI_PMU
-	help
-	  Support for PMU events monitoring on the ARM CCI-500/CCI-550 cache
-	  coherent interconnects. Both of them provide 8 independent event counters,
-	  which can count events pertaining to the slave/master interfaces as well
-	  as the internal events to the CCI.
-
-	  If unsure, say Y
-
 config BRCMSTB_GISB_ARB
 	bool "Broadcom STB GISB bus arbiter"
 	depends on ARM || ARM64 || MIPS

drivers/perf/Kconfig

@@ -5,6 +5,32 @@
 menu "Performance monitor support"
 	depends on PERF_EVENTS
 
+config ARM_CCI_PMU
+	bool
+	select ARM_CCI
+
+config ARM_CCI400_PMU
+	bool "ARM CCI400 PMU support"
+	depends on (ARM && CPU_V7) || ARM64
+	select ARM_CCI400_COMMON
+	select ARM_CCI_PMU
+	help
+	  Support for PMU events monitoring on the ARM CCI-400 (cache coherent
+	  interconnect). CCI-400 supports counting events related to the
+	  connected slave/master interfaces.
+
+config ARM_CCI5xx_PMU
+	bool "ARM CCI-500/CCI-550 PMU support"
+	depends on (ARM && CPU_V7) || ARM64
+	select ARM_CCI_PMU
+	help
+	  Support for PMU events monitoring on the ARM CCI-500/CCI-550 cache
+	  coherent interconnects. Both of them provide 8 independent event counters,
+	  which can count events pertaining to the slave/master interfaces as well
+	  as the internal events to the CCI.
+
+	  If unsure, say Y
+
 config ARM_CCN
 	tristate "ARM CCN driver support"
 	depends on ARM || ARM64

drivers/perf/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_ARM_CCI_PMU) += arm-cci.o
 obj-$(CONFIG_ARM_CCN) += arm-ccn.o
 obj-$(CONFIG_ARM_DSU_PMU) += arm_dsu_pmu.o
 obj-$(CONFIG_ARM_PMU) += arm_pmu.o arm_pmu_platform.o