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>hifive-unleashed-5.1
parent
7703eac96a
commit
a2f5203fec
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@ -17,6 +17,7 @@
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/pl330.h>
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#include <linux/amba/pl330.h>
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#include <linux/pm_runtime.h>
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#define NR_DEFAULT_DESC 16
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#define NR_DEFAULT_DESC 16
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@ -83,6 +84,8 @@ struct dma_pl330_dmac {
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/* Peripheral channels connected to this DMAC */
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/* Peripheral channels connected to this DMAC */
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struct dma_pl330_chan *peripherals; /* keep at end */
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struct dma_pl330_chan *peripherals; /* keep at end */
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struct clk *clk;
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};
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};
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struct dma_pl330_desc {
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struct dma_pl330_desc {
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@ -696,6 +699,30 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
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goto probe_err1;
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goto probe_err1;
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}
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}
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pdmac->clk = clk_get(&adev->dev, "dma");
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if (IS_ERR(pdmac->clk)) {
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dev_err(&adev->dev, "Cannot get operation clock.\n");
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ret = -EINVAL;
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goto probe_err1;
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}
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amba_set_drvdata(adev, pdmac);
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#ifdef CONFIG_PM_RUNTIME
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/* to use the runtime PM helper functions */
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pm_runtime_enable(&adev->dev);
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/* enable the power domain */
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if (pm_runtime_get_sync(&adev->dev)) {
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dev_err(&adev->dev, "failed to get runtime pm\n");
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ret = -ENODEV;
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goto probe_err1;
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}
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#else
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/* enable dma clk */
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clk_enable(pdmac->clk);
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#endif
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irq = adev->irq[0];
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irq = adev->irq[0];
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ret = request_irq(irq, pl330_irq_handler, 0,
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ret = request_irq(irq, pl330_irq_handler, 0,
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dev_name(&adev->dev), pi);
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dev_name(&adev->dev), pi);
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@ -771,8 +798,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
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goto probe_err4;
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goto probe_err4;
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}
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}
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amba_set_drvdata(adev, pdmac);
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dev_info(&adev->dev,
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dev_info(&adev->dev,
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"Loaded driver for PL330 DMAC-%d\n", adev->periphid);
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"Loaded driver for PL330 DMAC-%d\n", adev->periphid);
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dev_info(&adev->dev,
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dev_info(&adev->dev,
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@ -833,6 +858,13 @@ static int __devexit pl330_remove(struct amba_device *adev)
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res = &adev->res;
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res = &adev->res;
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release_mem_region(res->start, resource_size(res));
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release_mem_region(res->start, resource_size(res));
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#ifdef CONFIG_PM_RUNTIME
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pm_runtime_put(&adev->dev);
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pm_runtime_disable(&adev->dev);
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#else
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clk_disable(pdmac->clk);
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#endif
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kfree(pdmac);
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kfree(pdmac);
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return 0;
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return 0;
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@ -846,10 +878,49 @@ static struct amba_id pl330_ids[] = {
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{ 0, 0 },
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{ 0, 0 },
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};
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};
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#ifdef CONFIG_PM_RUNTIME
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static int pl330_runtime_suspend(struct device *dev)
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{
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struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);
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if (!pdmac) {
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dev_err(dev, "failed to get dmac\n");
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return -ENODEV;
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}
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clk_disable(pdmac->clk);
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return 0;
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}
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static int pl330_runtime_resume(struct device *dev)
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{
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struct dma_pl330_dmac *pdmac = dev_get_drvdata(dev);
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if (!pdmac) {
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dev_err(dev, "failed to get dmac\n");
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return -ENODEV;
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}
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clk_enable(pdmac->clk);
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return 0;
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}
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#else
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#define pl330_runtime_suspend NULL
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#define pl330_runtime_resume NULL
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#endif /* CONFIG_PM_RUNTIME */
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static const struct dev_pm_ops pl330_pm_ops = {
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.runtime_suspend = pl330_runtime_suspend,
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.runtime_resume = pl330_runtime_resume,
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};
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static struct amba_driver pl330_driver = {
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static struct amba_driver pl330_driver = {
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.drv = {
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.drv = {
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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.name = "dma-pl330",
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.name = "dma-pl330",
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.pm = &pl330_pm_ops,
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},
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},
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.id_table = pl330_ids,
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.id_table = pl330_ids,
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.probe = pl330_probe,
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.probe = pl330_probe,
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