diff options
| author | Jingchang Lu <jingchang.lu@freescale.com> | 2014-12-30 16:41:47 +0800 |
|---|---|---|
| committer | Stefan Agner <stefan.agner@toradex.com> | 2015-02-02 13:35:32 +0100 |
| commit | 7ac2ea9c1b03d113e4fb822f2da223aa3a6a1e7a (patch) | |
| tree | b54b2d9fc4331a23f53f1054af4543791e4322eb | |
| parent | 9f5f55dcf9cb6f79ba6d94f95438278092c0323c (diff) | |
dmaengine: fsl-edma: add PM suspend/resume support
This adds power management suspend/resume support for
the fsl-edma driver.
Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>
[backported to 3.18]
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
| -rw-r--r-- | drivers/dma/fsl-edma.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index ba3cd8cf7e92..d622feb38716 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -1016,6 +1016,43 @@ static int fsl_edma_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int fsl_edma_pm_suspend(struct device *dev) +{ + struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); + struct fsl_edma_chan *fsl_chan; + int i; + + for (i = 0; i < fsl_edma->n_chans; i++) { + fsl_chan = &fsl_edma->chans[i]; + fsl_edma_chan_mux(fsl_chan, 0, false); + } + + return 0; +} + +static int fsl_edma_pm_resume(struct device *dev) +{ + struct fsl_edma_engine *fsl_edma = dev_get_drvdata(dev); + struct fsl_edma_chan *fsl_chan; + int i; + + for (i = 0; i < fsl_edma->n_chans; i++) { + fsl_chan = &fsl_edma->chans[i]; + edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); + /* restore the channel slave id configuration */ + fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true); + } + + edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, + fsl_edma->membase + EDMA_CR); + + return 0; +} +#endif +static +SIMPLE_DEV_PM_OPS(fsl_edma_pm_ops, fsl_edma_pm_suspend, fsl_edma_pm_resume); + static const struct of_device_id fsl_edma_dt_ids[] = { { .compatible = "fsl,vf610-edma", }, { /* sentinel */ } @@ -1027,6 +1064,7 @@ static struct platform_driver fsl_edma_driver = { .name = "fsl-edma", .owner = THIS_MODULE, .of_match_table = fsl_edma_dt_ids, + .pm = &fsl_edma_pm_ops, }, .probe = fsl_edma_probe, .remove = fsl_edma_remove, |