diff options
| author | Jingchang Lu <jingchang.lu@freescale.com> | 2014-09-18 02:11:36 (GMT) |
|---|---|---|
| committer | Matthew Weigel <Matthew.Weigel@freescale.com> | 2014-12-11 18:38:56 (GMT) |
| commit | 5c14af7b5f2c61e55044c7e28ebc50bb99548632 (patch) | |
| tree | 970e06626c8345a6205a2ab823f9bb2251942f32 /drivers/dma | |
| parent | d686c7b10a2ff6a389c62db631c9a2efe6d205a9 (diff) | |
| download | linux-fsl-qoriq-5c14af7b5f2c61e55044c7e28ebc50bb99548632.tar.xz | |
dmaengine: fsl-edma: add PM suspend/resume support
This adds eDMA power management suspend/resume support.
Signed-off-by: Jingchang Lu <jingchang.lu@freescale.com>
---
This patch depends on patch "dmaengine: fsl-edma: fixup reg offset
and hw S/G support in big-endian model", and the upstream will be
done after that patch upstreamed.
Change-Id: I596bf0934ea1ee4292f2cc64f9db8996becca14c
Reviewed-on: http://git.am.freescale.net:8181/21930
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Huan Wang <alison.wang@freescale.com>
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/fsl-edma.c | 45 |
1 files changed, 43 insertions, 2 deletions
diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index 1cc536b..eadb155 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -147,6 +147,7 @@ struct fsl_edma_slave_config { struct fsl_edma_chan { struct virt_dma_chan vchan; enum dma_status status; + u32 slave_id; struct fsl_edma_engine *edma; struct fsl_edma_desc *edesc; struct fsl_edma_slave_config fsc; @@ -774,6 +775,7 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, { struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; struct dma_chan *chan, *_chan; + struct fsl_edma_chan *fsl_chan; unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR; if (dma_spec->args_count != 2) @@ -787,8 +789,10 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, chan = dma_get_slave_channel(chan); if (chan) { chan->device->privatecnt++; - fsl_edma_chan_mux(to_fsl_edma_chan(chan), - dma_spec->args[1], true); + fsl_chan = to_fsl_edma_chan(chan); + fsl_chan->slave_id = dma_spec->args[1]; + fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, + true); mutex_unlock(&fsl_edma->fsl_edma_mutex); return chan; } @@ -817,6 +821,7 @@ static void fsl_edma_free_chan_resources(struct dma_chan *chan) spin_lock_irqsave(&fsl_chan->vchan.lock, flags); fsl_edma_disable_request(fsl_chan); fsl_edma_chan_mux(fsl_chan, 0, false); + fsl_chan->slave_id = 0; fsl_chan->edesc = NULL; vchan_get_all_descriptors(&fsl_chan->vchan, &head); spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); @@ -1005,6 +1010,41 @@ static int fsl_edma_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int fsl_edma_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_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)); + 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_suspend, fsl_edma_resume); + static const struct of_device_id fsl_edma_dt_ids[] = { { .compatible = "fsl,vf610-edma", }, { /* sentinel */ } @@ -1016,6 +1056,7 @@ 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, |