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dmaengine: tegra210-adma: Support dma-channel-mask property 

To support the flexibility to reserve the specific dma channels
add the support of dma-channel-mask property in the tegra210-adma
driver

Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
Link: https://lore.kernel.org/r/20231128071615.31447-3-mkumard@nvidia.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Mohan Kumar 2023-11-28 12:46:15 +05:30 committed by Vinod Koul
parent d95fcb78e7
commit 25b636225a
1 changed files with 33 additions and 2 deletions
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35
drivers/dma/tegra210-adma.c
View File

@ -153,6 +153,7 @@ struct tegra_adma {
void __iomem *base_addr;
struct clk *ahub_clk;
unsigned int nr_channels;
unsigned long *dma_chan_mask;
unsigned long rx_requests_reserved;
unsigned long tx_requests_reserved;
@ -741,6 +742,10 @@ static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
for (i = 0; i < tdma->nr_channels; i++) {
tdc = &tdma->channels[i];
/* skip for reserved channels */
if (!tdc->tdma)
continue;
ch_reg = &tdc->ch_regs;
ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
/* skip if channel is not active */
@ -779,6 +784,9 @@ static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
for (i = 0; i < tdma->nr_channels; i++) {
tdc = &tdma->channels[i];
/* skip for reserved channels */
if (!tdc->tdma)
continue;
ch_reg = &tdc->ch_regs;
/* skip if channel was not active earlier */
if (!ch_reg->cmd)
@ -867,10 +875,31 @@ static int tegra_adma_probe(struct platform_device *pdev)
return PTR_ERR(tdma->ahub_clk);
}
tdma->dma_chan_mask = devm_kzalloc(&pdev->dev,
BITS_TO_LONGS(tdma->nr_channels) * sizeof(unsigned long),
GFP_KERNEL);
if (!tdma->dma_chan_mask)
return -ENOMEM;
/* Enable all channels by default */
bitmap_fill(tdma->dma_chan_mask, tdma->nr_channels);
ret = of_property_read_u32_array(pdev->dev.of_node, "dma-channel-mask",
(u32 *)tdma->dma_chan_mask,
BITS_TO_U32(tdma->nr_channels));
if (ret < 0 && (ret != -EINVAL)) {
dev_err(&pdev->dev, "dma-channel-mask is not complete.\n");
return ret;
}
INIT_LIST_HEAD(&tdma->dma_dev.channels);
for (i = 0; i < tdma->nr_channels; i++) {
struct tegra_adma_chan *tdc = &tdma->channels[i];
/* skip for reserved channels */
if (!test_bit(i, tdma->dma_chan_mask))
continue;
tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
+ (cdata->ch_reg_size * i);
@ -957,8 +986,10 @@ static void tegra_adma_remove(struct platform_device *pdev)
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&tdma->dma_dev);
for (i = 0; i < tdma->nr_channels; ++i)
irq_dispose_mapping(tdma->channels[i].irq);
for (i = 0; i < tdma->nr_channels; ++i) {
if (tdma->channels[i].irq)
irq_dispose_mapping(tdma->channels[i].irq);
}
pm_runtime_disable(&pdev->dev);
}