dma: mmp_tdma: move to generic device tree binding (7dedc002) · Commits · 戴 / test

drivers/dma/mmp_tdma.c

+50 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,7 @@
		#include <mach/regs-icu.h>
		#include <linux/platform_data/dma-mmp_tdma.h>
		#include <linux/of_device.h>
		#include <linux/of_dma.h>

		#include "dmaengine.h"

		@@ -541,6 +542,45 @@ static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
		return 0;
		}

		struct mmp_tdma_filter_param {
		struct device_node *of_node;
		unsigned int chan_id;
		};

		static bool mmp_tdma_filter_fn(struct dma_chan chan, void fn_param)
		{
		struct mmp_tdma_filter_param *param = fn_param;
		struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
		struct dma_device *pdma_device = tdmac->chan.device;

		if (pdma_device->dev->of_node != param->of_node)
		return false;

		if (chan->chan_id != param->chan_id)
		return false;

		return true;
		}

		struct dma_chan mmp_tdma_xlate(struct of_phandle_args dma_spec,
		struct of_dma *ofdma)
		{
		struct mmp_tdma_device *tdev = ofdma->of_dma_data;
		dma_cap_mask_t mask = tdev->device.cap_mask;
		struct mmp_tdma_filter_param param;

		if (dma_spec->args_count != 1)
		return NULL;

		param.of_node = ofdma->of_node;
		param.chan_id = dma_spec->args[0];

		if (param.chan_id >= TDMA_CHANNEL_NUM)
		return NULL;

		return dma_request_channel(mask, mmp_tdma_filter_fn, &param);
		}

		static struct of_device_id mmp_tdma_dt_ids[] = {
		{ .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
		{ .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
		@@ -631,6 +671,16 @@ static int mmp_tdma_probe(struct platform_device *pdev)
		return ret;
		}

		if (pdev->dev.of_node) {
		ret = of_dma_controller_register(pdev->dev.of_node,
		mmp_tdma_xlate, tdev);
		if (ret) {
		dev_err(tdev->device.dev,
		"failed to register controller\n");
		dma_async_device_unregister(&tdev->device);
		}
		}

		dev_info(tdev->device.dev, "initialized\n");
		return 0;
		}

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