dmaengine: qcom-bam-dma: Add pm_runtime support

Adds pm_runtime support for BAM DMA so that clock is enabled only
when there is a transaction going on to help save power.

Signed-off-by: Pramod Gurav <pramod.gurav@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Pramod Gurav 2016-06-17 15:56:03 +05:30 committed by Vinod Koul
parent 1a695a905c
commit 7d2545599f
1 changed files with 109 additions and 1 deletions

View File

@ -48,6 +48,7 @@
#include <linux/of_dma.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/pm_runtime.h>
#include "../dmaengine.h"
#include "../virt-dma.h"
@ -58,6 +59,8 @@ struct bam_desc_hw {
__le16 flags;
};
#define BAM_DMA_AUTOSUSPEND_DELAY 100
#define DESC_FLAG_INT BIT(15)
#define DESC_FLAG_EOT BIT(14)
#define DESC_FLAG_EOB BIT(13)
@ -527,12 +530,17 @@ static void bam_free_chan(struct dma_chan *chan)
struct bam_device *bdev = bchan->bdev;
u32 val;
unsigned long flags;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return;
vchan_free_chan_resources(to_virt_chan(chan));
if (bchan->curr_txd) {
dev_err(bchan->bdev->dev, "Cannot free busy channel\n");
return;
goto err;
}
spin_lock_irqsave(&bchan->vc.lock, flags);
@ -550,6 +558,10 @@ static void bam_free_chan(struct dma_chan *chan)
/* disable irq */
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN));
err:
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
/**
@ -696,11 +708,18 @@ static int bam_pause(struct dma_chan *chan)
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
unsigned long flag;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&bchan->vc.lock, flag);
writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_HALT));
bchan->paused = 1;
spin_unlock_irqrestore(&bchan->vc.lock, flag);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return 0;
}
@ -715,11 +734,18 @@ static int bam_resume(struct dma_chan *chan)
struct bam_chan *bchan = to_bam_chan(chan);
struct bam_device *bdev = bchan->bdev;
unsigned long flag;
int ret;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return ret;
spin_lock_irqsave(&bchan->vc.lock, flag);
writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT));
bchan->paused = 0;
spin_unlock_irqrestore(&bchan->vc.lock, flag);
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return 0;
}
@ -795,6 +821,7 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
{
struct bam_device *bdev = data;
u32 clr_mask = 0, srcs = 0;
int ret;
srcs |= process_channel_irqs(bdev);
@ -802,6 +829,10 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
if (srcs & P_IRQ)
tasklet_schedule(&bdev->task);
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return ret;
if (srcs & BAM_IRQ) {
clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS));
@ -814,6 +845,9 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
}
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
return IRQ_HANDLED;
}
@ -893,6 +927,7 @@ static void bam_start_dma(struct bam_chan *bchan)
struct bam_desc_hw *desc;
struct bam_desc_hw *fifo = PTR_ALIGN(bchan->fifo_virt,
sizeof(struct bam_desc_hw));
int ret;
lockdep_assert_held(&bchan->vc.lock);
@ -904,6 +939,10 @@ static void bam_start_dma(struct bam_chan *bchan)
async_desc = container_of(vd, struct bam_async_desc, vd);
bchan->curr_txd = async_desc;
ret = pm_runtime_get_sync(bdev->dev);
if (ret < 0)
return;
/* on first use, initialize the channel hardware */
if (!bchan->initialized)
bam_chan_init_hw(bchan, async_desc->dir);
@ -946,6 +985,9 @@ static void bam_start_dma(struct bam_chan *bchan)
wmb();
writel_relaxed(bchan->tail * sizeof(struct bam_desc_hw),
bam_addr(bdev, bchan->id, BAM_P_EVNT_REG));
pm_runtime_mark_last_busy(bdev->dev);
pm_runtime_put_autosuspend(bdev->dev);
}
/**
@ -970,6 +1012,7 @@ static void dma_tasklet(unsigned long data)
bam_start_dma(bchan);
spin_unlock_irqrestore(&bchan->vc.lock, flags);
}
}
/**
@ -1213,6 +1256,13 @@ static int bam_dma_probe(struct platform_device *pdev)
if (ret)
goto err_unregister_dma;
pm_runtime_irq_safe(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, BAM_DMA_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
err_unregister_dma:
@ -1233,6 +1283,8 @@ static int bam_dma_remove(struct platform_device *pdev)
struct bam_device *bdev = platform_get_drvdata(pdev);
u32 i;
pm_runtime_force_suspend(&pdev->dev);
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&bdev->common);
@ -1260,11 +1312,67 @@ static int bam_dma_remove(struct platform_device *pdev)
return 0;
}
static int bam_dma_runtime_suspend(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
clk_disable(bdev->bamclk);
return 0;
}
static int bam_dma_runtime_resume(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
int ret;
ret = clk_enable(bdev->bamclk);
if (ret < 0) {
dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int bam_dma_suspend(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
pm_runtime_force_suspend(dev);
clk_unprepare(bdev->bamclk);
return 0;
}
static int bam_dma_resume(struct device *dev)
{
struct bam_device *bdev = dev_get_drvdata(dev);
int ret;
ret = clk_prepare(bdev->bamclk);
if (ret)
return ret;
pm_runtime_force_resume(dev);
return 0;
}
#endif
static const struct dev_pm_ops bam_dma_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(bam_dma_suspend, bam_dma_resume)
SET_RUNTIME_PM_OPS(bam_dma_runtime_suspend, bam_dma_runtime_resume,
NULL)
};
static struct platform_driver bam_dma_driver = {
.probe = bam_dma_probe,
.remove = bam_dma_remove,
.driver = {
.name = "bam-dma-engine",
.pm = &bam_dma_pm_ops,
.of_match_table = bam_of_match,
},
};