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DMA: PL330: Add support runtime PM for PL330 DMAC 

Signed-off-by: Boojin Kim <boojin.kim@samsung.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Boojin Kim 2011-09-02 09:44:29 +09:00 committed by Vinod Koul
parent 7703eac96a
commit a2f5203fec
1 changed files with 73 additions and 2 deletions
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75
drivers/dma/pl330.c
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@ -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,