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Commit a2f5203f authored by Boojin Kim's avatar Boojin Kim Committed by Vinod Koul
Browse files

DMA: PL330: Add support runtime PM for PL330 DMAC 



Signed-off-by: default avatarBoojin Kim <boojin.kim@samsung.com>
Acked-by: default avatarJassi Brar <jassisinghbrar@gmail.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Acked-by: default avatarVinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 7703eac9

drivers/dma/pl330.c

+73 −2
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/interrupt.h>

#include <linux/amba/bus.h>

#include <linux/amba/pl330.h>

#include <linux/pm_runtime.h>



#define NR_DEFAULT_DESC	16
@@ -83,6 +84,8 @@ struct dma_pl330_dmac { 


	/* Peripheral channels connected to this DMAC */

	struct dma_pl330_chan *peripherals; /* keep at end */



	struct clk *clk;

};



struct dma_pl330_desc {
@@ -696,6 +699,30 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) 
		goto probe_err1;

	}



	pdmac->clk = clk_get(&adev->dev, "dma");

	if (IS_ERR(pdmac->clk)) {

		dev_err(&adev->dev, "Cannot get operation clock.\n");

		ret = -EINVAL;

		goto probe_err1;

	}



	amba_set_drvdata(adev, pdmac);



#ifdef CONFIG_PM_RUNTIME

	/* to use the runtime PM helper functions */

	pm_runtime_enable(&adev->dev);



	/* enable the power domain */

	if (pm_runtime_get_sync(&adev->dev)) {

		dev_err(&adev->dev, "failed to get runtime pm\n");

		ret = -ENODEV;

		goto probe_err1;

	}

#else

	/* enable dma clk */

	clk_enable(pdmac->clk);

#endif



	irq = adev->irq[0];

	ret = request_irq(irq, pl330_irq_handler, 0,

			dev_name(&adev->dev), pi);
@@ -771,8 +798,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) 
		goto probe_err4;

	}



	amba_set_drvdata(adev, pdmac);



	dev_info(&adev->dev,

		"Loaded driver for PL330 DMAC-%d\n", adev->periphid);

	dev_info(&adev->dev,
@@ -833,6 +858,13 @@ static int __devexit pl330_remove(struct amba_device *adev) 
	res = &adev->res;

	release_mem_region(res->start, resource_size(res));



#ifdef CONFIG_PM_RUNTIME

	pm_runtime_put(&adev->dev);

	pm_runtime_disable(&adev->dev);

#else

	clk_disable(pdmac->clk);

#endif



	kfree(pdmac);



	return 0;
@@ -846,10 +878,49 @@ static struct amba_id pl330_ids[] = { 
	{ 0, 0 },

};



#ifdef CONFIG_PM_RUNTIME

static int pl330_runtime_suspend(struct device *dev)

{

	struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);



	if (!pdmac) {

		dev_err(dev, "failed to get dmac\n");

		return -ENODEV;

	}



	clk_disable(pdmac->clk);



	return 0;

}



static int pl330_runtime_resume(struct device *dev)

{

	struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);



	if (!pdmac) {

		dev_err(dev, "failed to get dmac\n");

		return -ENODEV;

	}



	clk_enable(pdmac->clk);



	return 0;

}

#else

#define pl330_runtime_suspend	NULL

#define pl330_runtime_resume	NULL

#endif /* CONFIG_PM_RUNTIME */



static const struct dev_pm_ops pl330_pm_ops = {

	.runtime_suspend = pl330_runtime_suspend,

	.runtime_resume = pl330_runtime_resume,

};



static struct amba_driver pl330_driver = {

	.drv = {

		.owner = THIS_MODULE,

		.name = "dma-pl330",

		.pm = &pl330_pm_ops,

	},

	.id_table = pl330_ids,

	.probe = pl330_probe,