dma: rcar-audmapp: add DT support

* R-Car Audio DMAC peri peri Device Tree bindings

Required properties:

- compatible:	should be "renesas,rcar-audmapp"

- #dma-cells:	should be <1>, see "dmas" property below

Example:

	audmapp: audio-dma-pp@0xec740000 {

		compatible = "renesas,rcar-audmapp";

		#dma-cells = <1>;

		reg = <0 0xec740000 0 0x200>;

	};

* DMA client

Required properties:

- dmas:		a list of <[DMA multiplexer phandle] [SRS/DRS value]> pairs,

		where SRS/DRS values are fixed handles, specified in the SoC

		manual as the value that would be written into the PDMACHCR.

- dma-names:	a list of DMA channel names, one per "dmas" entry

Example:

	dmas = <&audmapp 0x2d00

		&audmapp 0x3700>;

	dma-names =  "src0_ssiu0",

		     "dvc0_ssiu0";

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/dmaengine.h>

#include <linux/of_dma.h>

#include <linux/platform_data/dma-rcar-audmapp.h>

#include <linux/platform_device.h>

#include <linux/shdma-base.h>

	dma_addr_t dst;

};

#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)

#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)

#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)

#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device,	\

	audmapp_write(auchan, chcr,	PDMACHCR);

}

static struct audmapp_slave_config *

audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)

static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,

			      u32 *chcr, dma_addr_t *dst)

{

	struct audmapp_device *audev = to_dev(auchan);

	struct audmapp_pdata *pdata = audev->pdata;

	struct audmapp_slave_config *cfg;

	int i;

	*chcr	= 0;

	*dst	= 0;

	if (!pdata) { /* DT */

		*chcr = ((u32)slave_id) << 16;

		auchan->shdma_chan.slave_id = (slave_id) >> 8;

		return;

	}

	/* non-DT */

	if (slave_id >= AUDMAPP_SLAVE_NUMBER)

		return NULL;

		return;

	for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)

		if (cfg->slave_id == slave_id)

			return cfg;

	return NULL;

		if (cfg->slave_id == slave_id) {

			*chcr	= cfg->chcr;

			*dst	= cfg->dst;

			break;

		}

}

static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,

			     dma_addr_t slave_addr, bool try)

{

	struct audmapp_chan *auchan = to_chan(schan);

	struct audmapp_slave_config *cfg =

		audmapp_find_slave(auchan, slave_id);

	u32 chcr;

	dma_addr_t dst;

	audmapp_get_config(auchan, slave_id, &chcr, &dst);

	if (!cfg)

		return -ENODEV;

	if (try)

		return 0;

	auchan->chcr	= cfg->chcr;

	auchan->slave_addr = slave_addr ? : cfg->dst;

	auchan->chcr		= chcr;

	auchan->slave_addr	= slave_addr ? : dst;

	return 0;

}

	dma_dev->chancnt = 0;

}

static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,

					 struct of_dma *ofdma)

{

	dma_cap_mask_t mask;

	struct dma_chan *chan;

	u32 chcr = dma_spec->args[0];

	if (dma_spec->args_count != 1)

		return NULL;

	dma_cap_zero(mask);

	dma_cap_set(DMA_SLAVE, mask);

	chan = dma_request_channel(mask, shdma_chan_filter, NULL);

	if (chan)

		to_shdma_chan(chan)->hw_req = chcr;

	return chan;

}

static int audmapp_probe(struct platform_device *pdev)

{

	struct audmapp_pdata *pdata = pdev->dev.platform_data;

	struct device_node *np = pdev->dev.of_node;

	struct audmapp_device *audev;

	struct shdma_dev *sdev;

	struct dma_device *dma_dev;

	struct resource *res;

	int err, i;

	if (!pdata)

	if (np)

		of_dma_controller_register(np, audmapp_of_xlate, pdev);

	else if (!pdata)

		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	return 0;

}

static const struct of_device_id audmapp_of_match[] = {

	{ .compatible = "renesas,rcar-audmapp", },

	{},

};

static struct platform_driver audmapp_driver = {

	.probe		= audmapp_probe,

	.remove		= audmapp_remove,

	.driver		= {

		.owner	= THIS_MODULE,

		.name	= "rcar-audmapp-engine",

		.of_match_table = audmapp_of_match,

	},

};

module_platform_driver(audmapp_driver);