perf/amlogic: Add support for Amlogic meson G12 SoC DDR PMU driver

Add support for Amlogic Meson G12 Series SOC - DDR bandwidth PMU driver
framework and interfaces. The PMU can not only monitor the total DDR
bandwidth, but also individual IP module bandwidth.

Signed-off-by: Jiucheng Xu <[email protected]>
Tested-by: Chris Healy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Jiucheng Xu

MAINTAINERS

@@ -1093,6 +1093,14 @@ S:	Maintained
 F:	Documentation/hid/amd-sfh*
 F:	drivers/hid/amd-sfh-hid/
 
+AMLOGIC DDR PMU DRIVER
+M:	Jiucheng Xu <[email protected]>
+L:	[email protected]
+S:	Supported
+W:	http://www.amlogic.com
+F:	drivers/perf/amlogic/
+F:	include/soc/amlogic/
+
 AMPHION VPU CODEC V4L2 DRIVER
 M:	Ming Qian <[email protected]>
 M:	Shijie Qin <[email protected]>

drivers/perf/Kconfig

@@ -201,4 +201,6 @@ config MARVELL_CN10K_DDR_PMU
 
 source "drivers/perf/arm_cspmu/Kconfig"
 
+source "drivers/perf/amlogic/Kconfig"
+
 endmenu

drivers/perf/Makefile

@@ -22,3 +22,4 @@ obj-$(CONFIG_MARVELL_CN10K_DDR_PMU) += marvell_cn10k_ddr_pmu.o
 obj-$(CONFIG_APPLE_M1_CPU_PMU) += apple_m1_cpu_pmu.o
 obj-$(CONFIG_ALIBABA_UNCORE_DRW_PMU) += alibaba_uncore_drw_pmu.o
 obj-$(CONFIG_ARM_CORESIGHT_PMU_ARCH_SYSTEM_PMU) += arm_cspmu/
+obj-$(CONFIG_MESON_DDR_PMU) += amlogic/

drivers/perf/amlogic/Kconfig

@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config MESON_DDR_PMU
+	tristate "Amlogic DDR Bandwidth Performance Monitor"
+	depends on ARCH_MESON || COMPILE_TEST
+	help
+          Provides support for the DDR performance monitor
+          in Amlogic SoCs, which can give information about
+          memory throughput and other related events. It
+          supports multiple channels to monitor the memory
+          bandwidth simultaneously.

drivers/perf/amlogic/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_MESON_DDR_PMU) += meson_ddr_pmu_g12.o
+
+meson_ddr_pmu_g12-y	:= meson_ddr_pmu_core.o meson_g12_ddr_pmu.o