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Commit 0317e52e authored by Ben Dooks's avatar Ben Dooks
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ARM: SAMSUNG: Add support for interrupt wakeup-sources 



Add support for wakeup-mask style interrupts that share a
single mask register for various different interrupts. This
registers a set of interrupt->bit mappings and the register
they belong to.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 1f1f584c

arch/arm/plat-samsung/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -285,4 +285,12 @@ config SAMSUNG_PM_CHECK_CHUNKSIZE 


	  See <file:Documentation/arm/Samsung-S3C24XX/Suspend.txt>



config SAMSUNG_WAKEMASK

	bool

	depends on PM

	help

	  Compile support for wakeup-mask controls found on the S3C6400

	  and above. This code allows a set of interrupt to wakeup-mask

	  mappings. See <plat/wakeup-mask.h>



endif

arch/arm/plat-samsung/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -61,6 +61,8 @@ obj-$(CONFIG_PM) += pm.o 
obj-$(CONFIG_PM)		+= pm-gpio.o

obj-$(CONFIG_SAMSUNG_PM_CHECK)	+= pm-check.o



obj-$(CONFIG_SAMSUNG_WAKEMASK)	+= wakeup-mask.o



# PWM support



obj-$(CONFIG_HAVE_PWM)		+= pwm.o

arch/arm/plat-samsung/include/plat/wakeup-mask.h

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+44 −0
Original line number Diff line number Diff line 
/* arch/arm/plat-samsung/include/plat/wakeup-mask.h

 *

 * Copyright 2010 Ben Dooks <ben-linux@fluff.org>

 *

 * Support for wakeup mask interrupts on newer SoCs

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

*/



#ifndef __PLAT_WAKEUP_MASK_H

#define __PLAT_WAKEUP_MASK_H __file__



/* if no irq yet defined, but still want to mask */

#define NO_WAKEUP_IRQ (0x90000000)



/**

 * struct samsung_wakeup_mask - wakeup mask information

 * @irq: The interrupt associated with this wakeup.

 * @bit: The bit, as a (1 << bitno) controlling this source.

 */ 

struct samsung_wakeup_mask {

	unsigned int	irq;

	u32		bit;

};



/**

 * samsung_sync_wakemask - sync wakeup mask information for pm

 * @reg: The register that is used.

 * @masks: The list of masks to use.

 * @nr_masks: The number of entries pointed to buy @masks.

 *

 * Synchronise the wakeup mask information at suspend time from the list

 * of interrupts and control bits in @masks. We do this at suspend time

 * as overriding the relevant irq chips is harder and the register is only

 * required to be correct before we enter sleep.

 */

extern void samsung_sync_wakemask(void __iomem *reg,

				  struct samsung_wakeup_mask *masks,

				  int nr_masks);



#endif /* __PLAT_WAKEUP_MASK_H */

arch/arm/plat-samsung/wakeup-mask.c

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+47 −0
Original line number Diff line number Diff line 
/* arch/arm/plat-samsung/wakeup-mask.c

 *

 * Copyright 2010 Ben Dooks <ben-linux@fluff.org>

 *

 * Support for wakeup mask interrupts on newer SoCs

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

*/



#include <linux/kernel.h>

#include <linux/spinlock.h>

#include <linux/sysdev.h>

#include <linux/types.h>

#include <linux/irq.h>

#include <linux/io.h>



#include <plat/wakeup-mask.h>

#include <plat/pm.h>



void samsung_sync_wakemask(void __iomem *reg,

			   struct samsung_wakeup_mask *mask, int nr_mask)

{

	struct irq_desc *desc;

	u32 val;



	val = __raw_readl(reg);



	for (; nr_mask > 0; nr_mask--, mask++) {

		if (mask->irq == NO_WAKEUP_IRQ) {

			val |= mask->bit;

			continue;

		}



		desc = irq_to_desc(mask->irq);



		/* bit of a liberty to read this directly from irq_desc. */

		if (desc->wake_depth > 0)

			val &= ~mask->bit;

		else

			val |= mask->bit;

	}



	printk(KERN_INFO "wakemask %08x => %08x\n", __raw_readl(reg), val);

	__raw_writel(val, reg);

}