Commit aa90eb9d authored by Rabin Vincent's avatar Rabin Vincent Committed by Linus Walleij
Browse files

mach-ux500: DB8500 PMU support 



DB8500 has irqs from two cores ORed into one. Implement a
workaround to handle this by bouncing the interrupt by setting
the affinity to the other core when the interrupt appears to
be spurious on the current core.

Signed-off-by: default avatarRabin Vincent <rabin.vincent@stericsson.com>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 0e25a5c9

arch/arm/mach-ux500/cpu-db8500.c

+47 −4
Original line number Diff line number Diff line
@@ -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,

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