AXI performance monitor driver (#2222)

Uses the debugfs I/F to provide access to the AXI
bus performance monitors.

Requires the new mailbox peripheral access for access
to the VPU performance registers, system bus access
is done using direct register reads.

Signed-off-by: James Hughes <[email protected]>

Author: JamesH65

arch/arm/boot/dts/bcm2708-rpi.dtsi

@@ -37,6 +37,7 @@
 		fb = &fb;
 		vchiq = &vchiq;
 		thermal = &thermal;
+		axiperf = &axiperf;
 	};
 
 	leds: leds {
@@ -119,6 +120,7 @@
 		sd_force_pio = <&sdhost>,"brcm,force-pio?";
 		sd_pio_limit = <&sdhost>,"brcm,pio-limit:0";
 		sd_debug     = <&sdhost>,"brcm,debug";
+		axiperf      = <&axiperf>,"status";
 	};
 };
 

arch/arm/boot/dts/bcm270x.dtsi

@@ -130,6 +130,14 @@
 			/* Add alias */
 			status = "disabled";
 		};
+
+		axiperf: axiperf {
+			compatible = "brcm,bcm2835-axiperf";
+			reg = <0x7e009800 0x100>,
+			      <0x7ee08000 0x100>;
+			firmware = <&firmware>;
+			status = "disabled";
+		};
 	};
 
 	vdd_5v0_reg: fixedregulator_5v0 {

arch/arm/configs/bcm2709_defconfig

@@ -1179,6 +1179,7 @@ CONFIG_INV_MPU6050_I2C=m
 CONFIG_BMP280=m
 CONFIG_PWM_BCM2835=m
 CONFIG_PWM_PCA9685=m
+CONFIG_RPI_AXIPERF=m
 CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y

arch/arm/configs/bcmrpi_defconfig

@@ -1185,6 +1185,7 @@ CONFIG_INV_MPU6050_I2C=m
 CONFIG_BMP280=m
 CONFIG_PWM_BCM2835=m
 CONFIG_PWM_PCA9685=m
+CONFIG_RPI_AXIPERF=m
 CONFIG_RASPBERRYPI_FIRMWARE=y
 CONFIG_EXT4_FS=y
 CONFIG_EXT4_FS_POSIX_ACL=y

drivers/perf/Kconfig

@@ -43,4 +43,11 @@ config XGENE_PMU
         help
           Say y if you want to use APM X-Gene SoC performance monitors.
 
+config RPI_AXIPERF
+        depends on ARCH_BCM2835
+        tristate "RaspberryPi AXI Performance monitors"
+        default n
+        help
+          Say y if you want to use Raspberry Pi AXI performance monitors, m if
+          you want to build it as a module.
 endmenu

drivers/perf/Makefile

@@ -3,3 +3,4 @@ obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o
 obj-$(CONFIG_QCOM_L2_PMU)	+= qcom_l2_pmu.o
 obj-$(CONFIG_QCOM_L3_PMU) += qcom_l3_pmu.o
 obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o
+obj-$(CONFIG_RPI_AXIPERF) += raspberrypi_axi_monitor.o