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path: root/drivers/dma/tegra20-apb-dma.c
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Diffstat (limited to 'drivers/dma/tegra20-apb-dma.c')
-rw-r--r--drivers/dma/tegra20-apb-dma.c73
1 files changed, 40 insertions, 33 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index c8f79dcaaee8..935da8192f59 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -296,7 +296,7 @@ static struct tegra_dma_desc *tegra_dma_desc_get(
spin_unlock_irqrestore(&tdc->lock, flags);
/* Allocate DMA desc */
- dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC);
+ dma_desc = kzalloc(sizeof(*dma_desc), GFP_NOWAIT);
if (!dma_desc) {
dev_err(tdc2dev(tdc), "dma_desc alloc failed\n");
return NULL;
@@ -336,7 +336,7 @@ static struct tegra_dma_sg_req *tegra_dma_sg_req_get(
}
spin_unlock_irqrestore(&tdc->lock, flags);
- sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC);
+ sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_NOWAIT);
if (!sg_req)
dev_err(tdc2dev(tdc), "sg_req alloc failed\n");
return sg_req;
@@ -1186,10 +1186,12 @@ static int tegra_dma_alloc_chan_resources(struct dma_chan *dc)
dma_cookie_init(&tdc->dma_chan);
tdc->config_init = false;
- ret = clk_prepare_enable(tdma->dma_clk);
+
+ ret = pm_runtime_get_sync(tdma->dev);
if (ret < 0)
- dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret);
- return ret;
+ return ret;
+
+ return 0;
}
static void tegra_dma_free_chan_resources(struct dma_chan *dc)
@@ -1232,7 +1234,7 @@ static void tegra_dma_free_chan_resources(struct dma_chan *dc)
list_del(&sg_req->node);
kfree(sg_req);
}
- clk_disable_unprepare(tdma->dma_clk);
+ pm_runtime_put(tdma->dev);
tdc->slave_id = 0;
}
@@ -1356,20 +1358,14 @@ static int tegra_dma_probe(struct platform_device *pdev)
spin_lock_init(&tdma->global_lock);
pm_runtime_enable(&pdev->dev);
- if (!pm_runtime_enabled(&pdev->dev)) {
+ if (!pm_runtime_enabled(&pdev->dev))
ret = tegra_dma_runtime_resume(&pdev->dev);
- if (ret) {
- dev_err(&pdev->dev, "dma_runtime_resume failed %d\n",
- ret);
- goto err_pm_disable;
- }
- }
+ else
+ ret = pm_runtime_get_sync(&pdev->dev);
- /* Enable clock before accessing registers */
- ret = clk_prepare_enable(tdma->dma_clk);
if (ret < 0) {
- dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
- goto err_pm_disable;
+ pm_runtime_disable(&pdev->dev);
+ return ret;
}
/* Reset DMA controller */
@@ -1382,7 +1378,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0);
tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul);
- clk_disable_unprepare(tdma->dma_clk);
+ pm_runtime_put(&pdev->dev);
INIT_LIST_HEAD(&tdma->dma_dev.channels);
for (i = 0; i < cdata->nr_channels; i++) {
@@ -1400,8 +1396,7 @@ static int tegra_dma_probe(struct platform_device *pdev)
}
tdc->irq = res->start;
snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i);
- ret = devm_request_irq(&pdev->dev, tdc->irq,
- tegra_dma_isr, 0, tdc->name, tdc);
+ ret = request_irq(tdc->irq, tegra_dma_isr, 0, tdc->name, tdc);
if (ret) {
dev_err(&pdev->dev,
"request_irq failed with err %d channel %d\n",
@@ -1482,10 +1477,11 @@ err_unregister_dma_dev:
err_irq:
while (--i >= 0) {
struct tegra_dma_channel *tdc = &tdma->channels[i];
+
+ free_irq(tdc->irq, tdc);
tasklet_kill(&tdc->tasklet);
}
-err_pm_disable:
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
tegra_dma_runtime_suspend(&pdev->dev);
@@ -1502,6 +1498,7 @@ static int tegra_dma_remove(struct platform_device *pdev)
for (i = 0; i < tdma->chip_data->nr_channels; ++i) {
tdc = &tdma->channels[i];
+ free_irq(tdc->irq, tdc);
tasklet_kill(&tdc->tasklet);
}
@@ -1514,8 +1511,7 @@ static int tegra_dma_remove(struct platform_device *pdev)
static int tegra_dma_runtime_suspend(struct device *dev)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
clk_disable_unprepare(tdma->dma_clk);
return 0;
@@ -1523,8 +1519,7 @@ static int tegra_dma_runtime_suspend(struct device *dev)
static int tegra_dma_runtime_resume(struct device *dev)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct tegra_dma *tdma = platform_get_drvdata(pdev);
+ struct tegra_dma *tdma = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(tdma->dma_clk);
@@ -1543,7 +1538,7 @@ static int tegra_dma_pm_suspend(struct device *dev)
int ret;
/* Enable clock before accessing register */
- ret = tegra_dma_runtime_resume(dev);
+ ret = pm_runtime_get_sync(dev);
if (ret < 0)
return ret;
@@ -1552,15 +1547,22 @@ static int tegra_dma_pm_suspend(struct device *dev)
struct tegra_dma_channel *tdc = &tdma->channels[i];
struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ /* Only save the state of DMA channels that are in use */
+ if (!tdc->config_init)
+ continue;
+
ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR);
ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR);
ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR);
ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ);
ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ);
+ if (tdma->chip_data->support_separate_wcount_reg)
+ ch_reg->wcount = tdc_read(tdc,
+ TEGRA_APBDMA_CHAN_WCOUNT);
}
/* Disable clock */
- tegra_dma_runtime_suspend(dev);
+ pm_runtime_put(dev);
return 0;
}
@@ -1571,7 +1573,7 @@ static int tegra_dma_pm_resume(struct device *dev)
int ret;
/* Enable clock before accessing register */
- ret = tegra_dma_runtime_resume(dev);
+ ret = pm_runtime_get_sync(dev);
if (ret < 0)
return ret;
@@ -1583,6 +1585,13 @@ static int tegra_dma_pm_resume(struct device *dev)
struct tegra_dma_channel *tdc = &tdma->channels[i];
struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg;
+ /* Only restore the state of DMA channels that are in use */
+ if (!tdc->config_init)
+ continue;
+
+ if (tdma->chip_data->support_separate_wcount_reg)
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
+ ch_reg->wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq);
@@ -1592,16 +1601,14 @@ static int tegra_dma_pm_resume(struct device *dev)
}
/* Disable clock */
- tegra_dma_runtime_suspend(dev);
+ pm_runtime_put(dev);
return 0;
}
#endif
static const struct dev_pm_ops tegra_dma_dev_pm_ops = {
-#ifdef CONFIG_PM
- .runtime_suspend = tegra_dma_runtime_suspend,
- .runtime_resume = tegra_dma_runtime_resume,
-#endif
+ SET_RUNTIME_PM_OPS(tegra_dma_runtime_suspend, tegra_dma_runtime_resume,
+ NULL)
SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume)
};
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