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authorNicolas Pitre <nicolas.pitre@linaro.org>2011-02-22 13:25:55 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2011-02-22 13:25:55 -0500
commit31e5a9c1e13d66a4fd53911a52911fb992f1f734 (patch)
treed8ef5a0ad761abcb5ab35cf0ce9dd13029eb5794
parent42e40544ed3d58be1f01408898bd09f9164e47ab (diff)
parent0fff6b9a4e0aba233a2ff644316d29b0cb784e33 (diff)
downloadlinux-linaro-31e5a9c1e13d66a4fd53911a52911fb992f1f734.tar.gz
Merge remote-tracking branch 'rmk/devel-stable' into linaro-2.6.38
-rw-r--r--arch/arm/include/asm/pmu.h14
-rw-r--r--arch/arm/kernel/perf_event.c17
-rw-r--r--arch/arm/mach-ux500/cpu-db8500.c51
3 files changed, 77 insertions, 5 deletions
diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h
index 8ccea012722..7544ce6b481 100644
--- a/arch/arm/include/asm/pmu.h
+++ b/arch/arm/include/asm/pmu.h
@@ -12,11 +12,25 @@
#ifndef __ARM_PMU_H__
#define __ARM_PMU_H__
+#include <linux/interrupt.h>
+
enum arm_pmu_type {
ARM_PMU_DEVICE_CPU = 0,
ARM_NUM_PMU_DEVICES,
};
+/*
+ * struct arm_pmu_platdata - ARM PMU platform data
+ *
+ * @handle_irq: an optional handler which will be called from the interrupt and
+ * passed the address of the low level handler, and can be used to implement
+ * any platform specific handling before or after calling it.
+ */
+struct arm_pmu_platdata {
+ irqreturn_t (*handle_irq)(int irq, void *dev,
+ irq_handler_t pmu_handler);
+};
+
#ifdef CONFIG_CPU_HAS_PMU
/**
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index d150ad1ccb5..22e194eb853 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -377,9 +377,18 @@ validate_group(struct perf_event *event)
return 0;
}
+static irqreturn_t armpmu_platform_irq(int irq, void *dev)
+{
+ struct arm_pmu_platdata *plat = dev_get_platdata(&pmu_device->dev);
+
+ return plat->handle_irq(irq, dev, armpmu->handle_irq);
+}
+
static int
armpmu_reserve_hardware(void)
{
+ struct arm_pmu_platdata *plat;
+ irq_handler_t handle_irq;
int i, err = -ENODEV, irq;
pmu_device = reserve_pmu(ARM_PMU_DEVICE_CPU);
@@ -390,6 +399,12 @@ armpmu_reserve_hardware(void)
init_pmu(ARM_PMU_DEVICE_CPU);
+ plat = dev_get_platdata(&pmu_device->dev);
+ if (plat && plat->handle_irq)
+ handle_irq = armpmu_platform_irq;
+ else
+ handle_irq = armpmu->handle_irq;
+
if (pmu_device->num_resources < 1) {
pr_err("no irqs for PMUs defined\n");
return -ENODEV;
@@ -400,7 +415,7 @@ armpmu_reserve_hardware(void)
if (irq < 0)
continue;
- err = request_irq(irq, armpmu->handle_irq,
+ err = request_irq(irq, handle_irq,
IRQF_DISABLED | IRQF_NOBALANCING,
"armpmu", NULL);
if (err) {
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 1748fbc5853..5c0fabf5fa0 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -12,22 +12,20 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/amba/bus.h>
+#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/mach/map.h>
+#include <asm/pmu.h>
#include <mach/hardware.h>
#include <mach/setup.h>
#include <mach/devices.h>
#include "devices-db8500.h"
-static struct platform_device *platform_devs[] __initdata = {
- &u8500_dma40_device,
-};
-
/* minimum static i/o mapping required to boot U8500 platforms */
static struct map_desc u8500_uart_io_desc[] __initdata = {
__IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
@@ -89,6 +87,51 @@ void __init u8500_map_io(void)
iotable_init(u8500_v2_io_desc, ARRAY_SIZE(u8500_v2_io_desc));
}
+static struct resource db8500_pmu_resources[] = {
+ [0] = {
+ .start = IRQ_DB8500_PMU,
+ .end = IRQ_DB8500_PMU,
+ .flags = IORESOURCE_IRQ,
+ },
+};
+
+/*
+ * The PMU IRQ lines of two cores are wired together into a single interrupt.
+ * Bounce the interrupt to the other core if it's not ours.
+ */
+static irqreturn_t db8500_pmu_handler(int irq, void *dev, irq_handler_t handler)
+{
+ irqreturn_t ret = handler(irq, dev);
+ int other = !smp_processor_id();
+
+ if (ret == IRQ_NONE && cpu_online(other))
+ irq_set_affinity(irq, cpumask_of(other));
+
+ /*
+ * We should be able to get away with the amount of IRQ_NONEs we give,
+ * while still having the spurious IRQ detection code kick in if the
+ * interrupt really starts hitting spuriously.
+ */
+ return ret;
+}
+
+static struct arm_pmu_platdata db8500_pmu_platdata = {
+ .handle_irq = db8500_pmu_handler,
+};
+
+static struct platform_device db8500_pmu_device = {
+ .name = "arm-pmu",
+ .id = ARM_PMU_DEVICE_CPU,
+ .num_resources = ARRAY_SIZE(db8500_pmu_resources),
+ .resource = db8500_pmu_resources,
+ .dev.platform_data = &db8500_pmu_platdata,
+};
+
+static struct platform_device *platform_devs[] __initdata = {
+ &u8500_dma40_device,
+ &db8500_pmu_device,
+};
+
static resource_size_t __initdata db8500_gpio_base[] = {
U8500_GPIOBANK0_BASE,
U8500_GPIOBANK1_BASE,