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Commit 89079493 authored by Rameshwar Prasad Sahu's avatar Rameshwar Prasad Sahu Committed by Vinod Koul
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dmaengine: xgene-dma: Add ACPI support for X-Gene DMA engine driver 



This patch adds ACPI support for the APM X-Gene DMA engine driver.

Signed-off-by: default avatarRameshwar Prasad Sahu <rsahu@apm.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent b93edcdd

drivers/dma/xgene-dma.c

+21 −7
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
 * NOTE: PM support is currently not available.

 */



#include <linux/acpi.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/dma-mapping.h>
@@ -1940,17 +1941,19 @@ static int xgene_dma_probe(struct platform_device *pdev) 
		return ret;



	pdma->clk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(pdma->clk)) {

	if (IS_ERR(pdma->clk) && !ACPI_COMPANION(&pdev->dev)) {

		dev_err(&pdev->dev, "Failed to get clk\n");

		return PTR_ERR(pdma->clk);

	}



	/* Enable clk before accessing registers */

	if (!IS_ERR(pdma->clk)) {

		ret = clk_prepare_enable(pdma->clk);

		if (ret) {

			dev_err(&pdev->dev, "Failed to enable clk %d\n", ret);

			return ret;

		}

	}



	/* Remove DMA RAM out of shutdown */

	ret = xgene_dma_init_mem(pdma);
@@ -1994,6 +1997,7 @@ static int xgene_dma_probe(struct platform_device *pdev) 


err_dma_mask:

err_clk_enable:

	if (!IS_ERR(pdma->clk))

		clk_disable_unprepare(pdma->clk);



	return ret;
@@ -2018,11 +2022,20 @@ static int xgene_dma_remove(struct platform_device *pdev) 
		xgene_dma_delete_chan_rings(chan);

	}



	if (!IS_ERR(pdma->clk))

		clk_disable_unprepare(pdma->clk);



	return 0;

}



#ifdef CONFIG_ACPI

static const struct acpi_device_id xgene_dma_acpi_match_ptr[] = {

	{"APMC0D43", 0},

	{},

};

MODULE_DEVICE_TABLE(acpi, xgene_dma_acpi_match_ptr);

#endif



static const struct of_device_id xgene_dma_of_match_ptr[] = {

	{.compatible = "apm,xgene-storm-dma",},

	{},
@@ -2035,6 +2048,7 @@ static struct platform_driver xgene_dma_driver = { 
	.driver = {

		.name = "X-Gene-DMA",

		.of_match_table = xgene_dma_of_match_ptr,

		.acpi_match_table = ACPI_PTR(xgene_dma_acpi_match_ptr),

	},

};