Commit a95791ef authored by Suzuki K. Poulose's avatar Suzuki K. Poulose Committed by Arnd Bergmann
Browse files

arm-cci: Add CCI-500 PMU support 



CCI-500 provides 8 event counters which can count any of the
supported events independently. The PMU event id is a 9-bit
value made of two parts.
	bits [8:5] - Source port
			0x0-0x6 Slave Ports
			0x8-0xD Master Ports
			0xf     Global Events to CCI
			0x7,0xe Reserved
	bits [0:4] - Event code (specific to each type of port)

The generic CCI-500 controlling interface remains the same with CCI-400.
However there are some differences in the PMU event counters.
 - No cycle counter
 - Upto 8 counters(4 in CCI-400)
 - Each counter area is 64K(4K in CCI400)
 - The counter0 starts at offset 0x10000 from the base of CCI

Cc: Punit Agrawal <punit.agrawal@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: default avatarSuzuki K. Poulose <suzuki.poulose@arm.com>
Acked-by: default avatarPunit Agrawal <punit.agrawal@arm.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent f4d58938

Documentation/devicetree/bindings/arm/cci.txt

+3 −1
Original line number Diff line number Diff line
@@ -31,8 +31,9 @@ specific to ARM. 
	- compatible

		Usage: required

		Value type: <string>

		Definition: must be set to

		Definition: must contain one of the following:

			    "arm,cci-400"

			    "arm,cci-500"



	- reg

		Usage: required
@@ -99,6 +100,7 @@ specific to ARM. 
				 "arm,cci-400-pmu,r1"

				 "arm,cci-400-pmu"  - DEPRECATED, permitted only where OS has

						      secure acces to CCI registers

				 "arm,cci-500-pmu,r0"

		- reg:

			Usage: required

			Value type: Integer cells. A register entry, expressed

drivers/bus/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -34,6 +34,20 @@ config ARM_CCI400_PORT_CTRL 
	  Low level power management driver for CCI400 cache coherent

	  interconnect for ARM platforms.



config ARM_CCI500_PMU

	bool "ARM CCI500 PMU support"

	default y

	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 cache coherent

	  interconnect. CCI-500 provides 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

	bool "ARM CCN driver support"

	depends on ARM || ARM64

drivers/bus/arm-cci.c

+133 −0
Original line number Diff line number Diff line
@@ -51,6 +51,9 @@ static const struct cci_nb_ports cci400_ports = { 
static const struct of_device_id arm_cci_matches[] = {

#ifdef CONFIG_ARM_CCI400_COMMON

	{.compatible = "arm,cci-400", .data = CCI400_PORTS_DATA },

#endif

#ifdef CONFIG_ARM_CCI500_PMU

	{ .compatible = "arm,cci-500", },

#endif

	{},

};
@@ -89,6 +92,9 @@ static const struct of_device_id arm_cci_matches[] = { 
enum {

	CCI_IF_SLAVE,

	CCI_IF_MASTER,

#ifdef CONFIG_ARM_CCI500_PMU

	CCI_IF_GLOBAL,

#endif

	CCI_IF_MAX,

};
@@ -144,6 +150,9 @@ enum cci_models { 
#ifdef CONFIG_ARM_CCI400_PMU

	CCI400_R0,

	CCI400_R1,

#endif

#ifdef CONFIG_ARM_CCI500_PMU

	CCI500_R0,

#endif

	CCI_MODEL_MAX

};
@@ -294,6 +303,101 @@ static inline struct cci_pmu_model *probe_cci_model(struct platform_device *pdev 
}

#endif	/* CONFIG_ARM_CCI400_PMU */



#ifdef CONFIG_ARM_CCI500_PMU



/*

 * CCI500 provides 8 independent event counters that can count

 * any of the events available.

 *

 * CCI500 PMU event id is an 9-bit value made of two parts.

 *	 bits [8:5] - Source for the event

 *		      0x0-0x6 - Slave interfaces

 *		      0x8-0xD - Master interfaces

 *		      0xf     - Global Events

 *		      0x7,0xe - Reserved

 *

 *	 bits [4:0] - Event code (specific to type of interface)

 */



/* Port ids */

#define CCI500_PORT_S0			0x0

#define CCI500_PORT_S1			0x1

#define CCI500_PORT_S2			0x2

#define CCI500_PORT_S3			0x3

#define CCI500_PORT_S4			0x4

#define CCI500_PORT_S5			0x5

#define CCI500_PORT_S6			0x6



#define CCI500_PORT_M0			0x8

#define CCI500_PORT_M1			0x9

#define CCI500_PORT_M2			0xa

#define CCI500_PORT_M3			0xb

#define CCI500_PORT_M4			0xc

#define CCI500_PORT_M5			0xd



#define CCI500_PORT_GLOBAL 		0xf



#define CCI500_PMU_EVENT_MASK		0x1ffUL

#define CCI500_PMU_EVENT_SOURCE_SHIFT	0x5

#define CCI500_PMU_EVENT_SOURCE_MASK	0xf

#define CCI500_PMU_EVENT_CODE_SHIFT	0x0

#define CCI500_PMU_EVENT_CODE_MASK	0x1f



#define CCI500_PMU_EVENT_SOURCE(event)	\

	((event >> CCI500_PMU_EVENT_SOURCE_SHIFT) & CCI500_PMU_EVENT_SOURCE_MASK)

#define CCI500_PMU_EVENT_CODE(event)	\

	((event >> CCI500_PMU_EVENT_CODE_SHIFT) & CCI500_PMU_EVENT_CODE_MASK)



#define CCI500_SLAVE_PORT_MIN_EV	0x00

#define CCI500_SLAVE_PORT_MAX_EV	0x1f

#define CCI500_MASTER_PORT_MIN_EV	0x00

#define CCI500_MASTER_PORT_MAX_EV	0x06

#define CCI500_GLOBAL_PORT_MIN_EV	0x00

#define CCI500_GLOBAL_PORT_MAX_EV	0x0f



static int cci500_validate_hw_event(struct cci_pmu *cci_pmu,

					unsigned long hw_event)

{

	u32 ev_source = CCI500_PMU_EVENT_SOURCE(hw_event);

	u32 ev_code = CCI500_PMU_EVENT_CODE(hw_event);

	int if_type;



	if (hw_event & ~CCI500_PMU_EVENT_MASK)

		return -ENOENT;



	switch (ev_source) {

	case CCI500_PORT_S0:

	case CCI500_PORT_S1:

	case CCI500_PORT_S2:

	case CCI500_PORT_S3:

	case CCI500_PORT_S4:

	case CCI500_PORT_S5:

	case CCI500_PORT_S6:

		if_type = CCI_IF_SLAVE;

		break;

	case CCI500_PORT_M0:

	case CCI500_PORT_M1:

	case CCI500_PORT_M2:

	case CCI500_PORT_M3:

	case CCI500_PORT_M4:

	case CCI500_PORT_M5:

		if_type = CCI_IF_MASTER;

		break;

	case CCI500_PORT_GLOBAL:

		if_type = CCI_IF_GLOBAL;

		break;

	default:

		return -ENOENT;

	}



	if (ev_code >= cci_pmu->model->event_ranges[if_type].min &&

		ev_code <= cci_pmu->model->event_ranges[if_type].max)

		return hw_event;



	return -ENOENT;

}

#endif	/* CONFIG_ARM_CCI500_PMU */



static int pmu_is_valid_counter(struct cci_pmu *cci_pmu, int idx)

{

	return 0 <= idx && idx <= CCI_PMU_CNTR_LAST(cci_pmu);
@@ -981,6 +1085,29 @@ static struct cci_pmu_model cci_pmu_models[] = { 
		.get_event_idx = cci400_get_event_idx,

	},

#endif

#ifdef CONFIG_ARM_CCI500_PMU

	[CCI500_R0] = {

		.name = "CCI_500",

		.fixed_hw_cntrs = 0,

		.num_hw_cntrs = 8,

		.cntr_size = SZ_64K,

		.event_ranges = {

			[CCI_IF_SLAVE] = {

				CCI500_SLAVE_PORT_MIN_EV,

				CCI500_SLAVE_PORT_MAX_EV,

			},

			[CCI_IF_MASTER] = {

				CCI500_MASTER_PORT_MIN_EV,

				CCI500_MASTER_PORT_MAX_EV,

			},

			[CCI_IF_GLOBAL] = {

				CCI500_GLOBAL_PORT_MIN_EV,

				CCI500_GLOBAL_PORT_MAX_EV,

			},

		},

		.validate_hw_event = cci500_validate_hw_event,

	},

#endif

};



static const struct of_device_id arm_cci_pmu_matches[] = {
@@ -997,6 +1124,12 @@ static const struct of_device_id arm_cci_pmu_matches[] = { 
		.compatible = "arm,cci-400-pmu,r1",

		.data	= &cci_pmu_models[CCI400_R1],

	},

#endif

#ifdef CONFIG_ARM_CCI500_PMU

	{

		.compatible = "arm,cci-500-pmu,r0",

		.data = &cci_pmu_models[CCI500_R0],

	},

#endif

	{},

};

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