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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: Daniel Mack <zonque@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Daniel Mack 2013-09-22 16:50:04 +02:00 committed by Vinod Koul
parent c95905a6a3
commit f97b98d6d0
1 changed files with 29 additions and 0 deletions
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29
drivers/dma/cppi41.c
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@ -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),
},
};