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Commit c75ee752 authored by Hiroshi DOYU's avatar Hiroshi DOYU Committed by Tony Lindgren
Browse files

omap mailbox: add save_/restore_ctx() for PM 



To preserve the registers during off-mode

Signed-off-by: default avatarHiroshi DOYU <Hiroshi.DOYU@nokia.com>
parent da8cfe03

arch/arm/mach-omap2/mailbox.c

+32 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ 
#define MAILBOX_IRQ_NEWMSG(u)		(1 << (2 * (u)))

#define MAILBOX_IRQ_NOTFULL(u)		(1 << (2 * (u) + 1))



#define MBOX_REG_SIZE			0x120

#define MBOX_NR_REGS			(MBOX_REG_SIZE / sizeof(u32))



static void __iomem *mbox_base;



struct omap_mbox2_fifo {
@@ -45,6 +48,7 @@ struct omap_mbox2_priv { 
	unsigned long irqstatus;

	u32 newmsg_bit;

	u32 notfull_bit;

	u32 ctx[MBOX_NR_REGS];

};



static struct clk *mbox_ick_handle;
@@ -165,6 +169,32 @@ static int omap2_mbox_is_irq(struct omap_mbox *mbox, 
	return (enable & status & bit);

}



static void omap2_mbox_save_ctx(struct omap_mbox *mbox)

{

	int i;

	struct omap_mbox2_priv *p = mbox->priv;



	for (i = 0; i < MBOX_NR_REGS; i++) {

		p->ctx[i] = mbox_read_reg(i * sizeof(u32));



		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,

			i, p->ctx[i]);

	}

}



static void omap2_mbox_restore_ctx(struct omap_mbox *mbox)

{

	int i;

	struct omap_mbox2_priv *p = mbox->priv;



	for (i = 0; i < MBOX_NR_REGS; i++) {

		mbox_write_reg(p->ctx[i], i * sizeof(u32));



		dev_dbg(mbox->dev, "%s: [%02x] %08x\n", __func__,

			i, p->ctx[i]);

	}

}



static struct omap_mbox_ops omap2_mbox_ops = {

	.type		= OMAP_MBOX_TYPE2,

	.startup	= omap2_mbox_startup,
@@ -177,6 +207,8 @@ static struct omap_mbox_ops omap2_mbox_ops = { 
	.disable_irq	= omap2_mbox_disable_irq,

	.ack_irq	= omap2_mbox_ack_irq,

	.is_irq		= omap2_mbox_is_irq,

	.save_ctx	= omap2_mbox_save_ctx,

	.restore_ctx	= omap2_mbox_restore_ctx,

};



/*

arch/arm/plat-omap/include/mach/mailbox.h

+23 −0
Original line number Diff line number Diff line
@@ -33,6 +33,9 @@ struct omap_mbox_ops { 
	void		(*disable_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);

	void		(*ack_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);

	int		(*is_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);

	/* ctx */

	void		(*save_ctx)(struct omap_mbox *mbox);

	void		(*restore_ctx)(struct omap_mbox *mbox);

};



struct omap_mbox_queue {
@@ -70,4 +73,24 @@ void omap_mbox_put(struct omap_mbox *); 
int omap_mbox_register(struct device *parent, struct omap_mbox *);

int omap_mbox_unregister(struct omap_mbox *);



static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)

{

	if (!mbox->ops->save_ctx) {

		dev_err(mbox->dev, "%s:\tno save\n", __func__);

		return;

	}



	mbox->ops->save_ctx(mbox);

}



static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)

{

	if (!mbox->ops->restore_ctx) {

		dev_err(mbox->dev, "%s:\tno restore\n", __func__);

		return;

	}



	mbox->ops->restore_ctx(mbox);

}



#endif /* MAILBOX_H */