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Commit c5115953 authored by Nicolas Ferre's avatar Nicolas Ferre Committed by Vinod Koul
Browse files

dmaengine: at_hdmac: add device tree support 



Add device tree probe support for atmel at_hdmac DMA driver.
Bindings are added to specify DMA controller configuration.

Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent 67348450

Documentation/devicetree/bindings/dma/atmel-dma.txt

0 → 100644
+14 −0
Original line number Diff line number Diff line 
* Atmel Direct Memory Access Controller (DMA)



Required properties:

- compatible: Should be "atmel,<chip>-dma"

- reg: Should contain DMA registers location and length

- interrupts: Should contain DMA interrupt



Examples:



dma@ffffec00 {

	compatible = "atmel,at91sam9g45-dma";

	reg = <0xffffec00 0x200>;

	interrupts = <21>;

};

drivers/dma/at_hdmac.c

+31 −1
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ 
#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/of_device.h>



#include "at_hdmac_regs.h"
@@ -1175,6 +1177,20 @@ static void atc_free_chan_resources(struct dma_chan *chan) 


/*--  Module Management  -----------------------------------------------*/



#if defined(CONFIG_OF)

static const struct of_device_id atmel_dma_dt_ids[] = {

	{

		.compatible = "atmel,at91sam9rl-dma",

		.data = (void *)ATDMA_DEVTYPE_SAM9RL

	}, {

		.compatible = "atmel,at91sam9g45-dma",

		.data = (void *)ATDMA_DEVTYPE_SAM9G45

	}, { /* sentinel */ }

};



MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids);

#endif



static struct platform_device_id atdma_devtypes[] = {

	{

		.name = "at91sam9rl_dma",
@@ -1187,6 +1203,19 @@ static struct platform_device_id atdma_devtypes[] = { 
	}

};



static inline enum atdma_devtype __init at_dma_get_driver_data(

					struct platform_device *pdev)

{

	if (pdev->dev.of_node) {

		const struct of_device_id *match;

		match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node);

		if (match == NULL)

			return ATDMA_DEVTYPE_UNDEFINED;

		return (enum atdma_devtype)match->data;

	}

	return platform_get_device_id(pdev)->driver_data;

}



/**

 * at_dma_off - disable DMA controller

 * @atdma: the Atmel HDAMC device
@@ -1218,7 +1247,7 @@ static int __init at_dma_probe(struct platform_device *pdev) 
	dma_cap_set(DMA_MEMCPY, cap_mask);



	/* get DMA parameters from controller type */

	atdmatype = platform_get_device_id(pdev)->driver_data;

	atdmatype = at_dma_get_driver_data(pdev);



	switch (atdmatype) {

	case ATDMA_DEVTYPE_SAM9RL:
@@ -1526,6 +1555,7 @@ static struct platform_driver at_dma_driver = { 
	.driver = {

		.name	= "at_hdmac",

		.pm	= &at_dma_dev_pm_ops,

		.of_match_table	= of_match_ptr(atmel_dma_dt_ids),

	},

};