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Commit af1d2f5c authored by Suman Anna's avatar Suman Anna Committed by Jassi Brar
Browse files

mailbox/omap: add support for suspend/resume 



Support has been added to the OMAP mailbox driver to allow it
to work across a system suspend/resume. The OMAP mailbox driver
requires only the interrupt configuration registers to be saved
and restored, and this is done in the suspend/resume callbacks.
The registers need to be saved only if there are active clients
at the time of suspend. The enabling and disabling of the mailbox
clocks is done automatically by the omap_device layer.

Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
parent 2240f8ae

drivers/mailbox/omap-mailbox.c

+45 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ struct omap_mbox_device { 
	struct device *dev;

	struct mutex cfg_lock;

	void __iomem *mbox_base;

	u32 *irq_ctx;

	u32 num_users;

	u32 num_fifos;

	u32 intr_type;
@@ -650,6 +651,44 @@ static const struct mbox_chan_ops omap_mbox_chan_ops = { 
	.shutdown       = omap_mbox_chan_shutdown,

};



#ifdef CONFIG_PM_SLEEP

static int omap_mbox_suspend(struct device *dev)

{

	struct omap_mbox_device *mdev = dev_get_drvdata(dev);

	u32 usr, reg;



	if (pm_runtime_status_suspended(dev))

		return 0;



	for (usr = 0; usr < mdev->num_users; usr++) {

		reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);

		mdev->irq_ctx[usr] = mbox_read_reg(mdev, reg);

	}



	return 0;

}



static int omap_mbox_resume(struct device *dev)

{

	struct omap_mbox_device *mdev = dev_get_drvdata(dev);

	u32 usr, reg;



	if (pm_runtime_status_suspended(dev))

		return 0;



	for (usr = 0; usr < mdev->num_users; usr++) {

		reg = MAILBOX_IRQENABLE(mdev->intr_type, usr);

		mbox_write_reg(mdev, mdev->irq_ctx[usr], reg);

	}



	return 0;

}

#endif



static const struct dev_pm_ops omap_mbox_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(omap_mbox_suspend, omap_mbox_resume)

};



static const struct of_device_id omap_mailbox_of_match[] = {

	{

		.compatible	= "ti,omap2-mailbox",
@@ -777,6 +816,11 @@ static int omap_mbox_probe(struct platform_device *pdev) 
	if (IS_ERR(mdev->mbox_base))

		return PTR_ERR(mdev->mbox_base);



	mdev->irq_ctx = devm_kzalloc(&pdev->dev, num_users * sizeof(u32),

				     GFP_KERNEL);

	if (!mdev->irq_ctx)

		return -ENOMEM;



	/* allocate one extra for marking end of list */

	list = devm_kzalloc(&pdev->dev, (info_count + 1) * sizeof(*list),

			    GFP_KERNEL);
@@ -887,6 +931,7 @@ static struct platform_driver omap_mbox_driver = { 
	.remove	= omap_mbox_remove,

	.driver	= {

		.name = "omap-mailbox",

		.pm = &omap_mbox_pm_ops,

		.of_match_table = of_match_ptr(omap_mailbox_of_match),

	},

};