[PATCH 4/5] arm-cci: Split the code for PMU vs driver support
Suzuki K. Poulose
suzuki.poulose at arm.com
Mon Mar 2 03:29:13 PST 2015
From: "Suzuki K. Poulose" <suzuki.poulose at arm.com>
This patch separates the PMU driver code from the low level
CCI driver code.
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
Also the ARM_CCI400_PORT_CTRL cannot be enabled by user. This
should be selected by platforms which need it.
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).
Signed-off-by: Suzuki K. Poulose <suzuki.poulose at arm.com>
---
arch/arm/mach-exynos/Kconfig | 2 +-
arch/arm/mach-vexpress/Kconfig | 4 ++--
drivers/bus/Kconfig | 27 +++++++++++++++++++++++----
drivers/bus/arm-cci.c | 24 ++++++++++++++++++++----
include/linux/arm-cci.h | 7 ++++++-
5 files changed, 52 insertions(+), 12 deletions(-)
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 603820e..81064cd 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -123,7 +123,7 @@ config SOC_EXYNOS5800
config EXYNOS5420_MCPM
bool "Exynos5420 Multi-Cluster PM support"
depends on MCPM && SOC_EXYNOS5420
- select ARM_CCI
+ select ARM_CCI400_PORT_CTRL
select ARM_CPU_SUSPEND
help
This is needed to provide CPU and cluster power management
diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
index d6b16d9..dd127f1 100644
--- a/arch/arm/mach-vexpress/Kconfig
+++ b/arch/arm/mach-vexpress/Kconfig
@@ -53,7 +53,7 @@ config ARCH_VEXPRESS_CORTEX_A5_A9_ERRATA
config ARCH_VEXPRESS_DCSCB
bool "Dual Cluster System Control Block (DCSCB) support"
depends on MCPM
- select ARM_CCI
+ select ARM_CCI400_PORT_CTRL
help
Support for the Dual Cluster System Configuration Block (DCSCB).
This is needed to provide CPU and cluster power management
@@ -71,7 +71,7 @@ config ARCH_VEXPRESS_SPC
config ARCH_VEXPRESS_TC2_PM
bool "Versatile Express TC2 power management"
depends on MCPM
- select ARM_CCI
+ select ARM_CCI400_PORT_CTRL
select ARCH_VEXPRESS_SPC
help
Support for CPU and cluster power management on Versatile Express
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e..bdc189f 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -43,12 +43,31 @@ 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"
+ 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 N
+
+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 56ad928..f86f096 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"
@@ -1020,14 +1028,16 @@ 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
@@ -1458,6 +1468,12 @@ 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)
{
diff --git a/include/linux/arm-cci.h b/include/linux/arm-cci.h
index aede5c7..521ec1f 100644
--- a/include/linux/arm-cci.h
+++ b/include/linux/arm-cci.h
@@ -30,12 +30,16 @@ struct device_node;
#ifdef CONFIG_ARM_CCI
extern bool cci_probed(void);
+#else
+static inline bool cci_probed(void) { return false; }
+#endif
+
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
extern int cci_ace_get_port(struct device_node *dn);
extern int cci_disable_port_by_cpu(u64 mpidr);
extern int __cci_control_port_by_device(struct device_node *dn, bool enable);
extern int __cci_control_port_by_index(u32 port, bool enable);
#else
-static inline bool cci_probed(void) { return false; }
static inline int cci_ace_get_port(struct device_node *dn)
{
return -ENODEV;
@@ -51,6 +55,7 @@ static inline int __cci_control_port_by_index(u32 port, bool enable)
return -ENODEV;
}
#endif
+
#define cci_disable_port_by_device(dev) \
__cci_control_port_by_device(dev, false)
#define cci_enable_port_by_device(dev) \
--
1.7.9.5
More information about the linux-arm-kernel
mailing list