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Commit f97b98d6 authored by Daniel Mack's avatar Daniel Mack Committed by Vinod Koul
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dma: cppi41: add support for suspend and resume 



This patch adds support for suspend/resume functionality to the cppi41
DMA driver. The steps necessary to make the system resume properly were
figured out by trial-and-error. The code as it stands now is the
minimum that has to be done to put the musb host system on an AM33xx
system into an operable state after resume.

Signed-off-by: default avatarDaniel Mack <zonque@gmail.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent c95905a6

drivers/dma/cppi41.c

+29 −0
Original line number Diff line number Diff line
@@ -1045,12 +1045,41 @@ static int cppi41_dma_remove(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int cppi41_suspend(struct device *dev)

{

	struct cppi41_dd *cdd = dev_get_drvdata(dev);



	cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);

	disable_sched(cdd);



	return 0;

}



static int cppi41_resume(struct device *dev)

{

	struct cppi41_dd *cdd = dev_get_drvdata(dev);

	int i;



	for (i = 0; i < DESCS_AREAS; i++)

		cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));



	init_sched(cdd);

	cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);



	return 0;

}

#endif



static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume);



static struct platform_driver cpp41_dma_driver = {

	.probe  = cppi41_dma_probe,

	.remove = cppi41_dma_remove,

	.driver = {

		.name = "cppi41-dma-engine",

		.owner = THIS_MODULE,

		.pm = &cppi41_pm_ops,

		.of_match_table = of_match_ptr(cppi41_dma_ids),

	},

};