diff options
Diffstat (limited to 'drivers/dma/pl330.c')
| -rw-r--r-- | drivers/dma/pl330.c | 75 |
1 files changed, 73 insertions, 2 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 00eee59..0b99af1 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -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, |