[linux-2.6-block.git] / sound / soc / sh / rcar / dma.c

/*
 * Renesas R-Car Audio DMAC support
 *
 * Copyright (C) 2015 Renesas Electronics Corp.
 * Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/delay.h>
#include <linux/of_dma.h>
#include "rsnd.h"

/*
 * Audio DMAC peri peri register
 */
#define PDMASAR		0x00
#define PDMADAR		0x04
#define PDMACHCR	0x0c

/* PDMACHCR */
#define PDMACHCR_DE		(1 << 0)

struct rsnd_dma_ctrl {
	void __iomem *base;
	int dmapp_num;
};

#define rsnd_priv_to_dmac(p)	((struct rsnd_dma_ctrl *)(p)->dma)

/*
 *		Audio DMAC
 */
static void rsnd_dmaen_complete(void *data)
{
	struct rsnd_dma *dma = (struct rsnd_dma *)data;
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);

	/*
	 * Renesas sound Gen1 needs 1 DMAC,
	 * Gen2 needs 2 DMAC.
	 * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
	 * But, Audio-DMAC-peri-peri doesn't have interrupt,
	 * and this driver is assuming that here.
	 *
	 * If Audio-DMAC-peri-peri has interrpt,
	 * rsnd_dai_pointer_update() will be called twice,
	 * ant it will breaks io->byte_pos
	 */

	rsnd_dai_pointer_update(io, io->byte_per_period);
}

static void rsnd_dmaen_stop(struct rsnd_dma *dma)
{
	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);

	dmaengine_terminate_all(dmaen->chan);
}

static void rsnd_dmaen_start(struct rsnd_dma *dma)
{
	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	struct snd_pcm_substream *substream = io->substream;
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_async_tx_descriptor *desc;
	int is_play = rsnd_io_is_play(io);

	desc = dmaengine_prep_dma_cyclic(dmaen->chan,
					 substream->runtime->dma_addr,
					 snd_pcm_lib_buffer_bytes(substream),
					 snd_pcm_lib_period_bytes(substream),
					 is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
					 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);

	if (!desc) {
		dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
		return;
	}

	desc->callback		= rsnd_dmaen_complete;
	desc->callback_param	= dma;

	if (dmaengine_submit(desc) < 0) {
		dev_err(dev, "dmaengine_submit() fail\n");
		return;
	}

	dma_async_issue_pending(dmaen->chan);
}

struct dma_chan *rsnd_dma_request_channel(struct device_node *of_node,
					  struct rsnd_mod *mod, char *name)
{
	struct dma_chan *chan;
	struct device_node *np;
	int i = 0;

	for_each_child_of_node(of_node, np) {
		if (i == rsnd_mod_id(mod))
			break;
		i++;
	}

	chan = of_dma_request_slave_channel(np, name);

	of_node_put(np);
	of_node_put(of_node);

	return chan;
}

static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_mod *mod_from,
						   struct rsnd_mod *mod_to)
{
	if ((!mod_from && !mod_to) ||
	    (mod_from && mod_to))
		return NULL;

	if (mod_from)
		return rsnd_mod_dma_req(mod_from);
	else
		return rsnd_mod_dma_req(mod_to);
}

static int rsnd_dmaen_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id,
			   struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
{
	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_slave_config cfg = {};
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	int is_play = rsnd_io_is_play(io);
	int ret;

	if (dmaen->chan) {
		dev_err(dev, "it already has dma channel\n");
		return -EIO;
	}

	if (dev->of_node) {
		dmaen->chan = rsnd_dmaen_request_channel(mod_from, mod_to);
	} else {
		dma_cap_mask_t mask;

		dma_cap_zero(mask);
		dma_cap_set(DMA_SLAVE, mask);

		dmaen->chan = dma_request_channel(mask, shdma_chan_filter,
						  (void *)id);
	}
	if (IS_ERR_OR_NULL(dmaen->chan)) {
		dmaen->chan = NULL;
		dev_err(dev, "can't get dma channel\n");
		goto rsnd_dma_channel_err;
	}

	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
	cfg.src_addr	= dma->src_addr;
	cfg.dst_addr	= dma->dst_addr;
	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;

	dev_dbg(dev, "dma : %pad -> %pad\n",
		&cfg.src_addr, &cfg.dst_addr);

	ret = dmaengine_slave_config(dmaen->chan, &cfg);
	if (ret < 0)
		goto rsnd_dma_init_err;

	return 0;

rsnd_dma_init_err:
	rsnd_dma_quit(dma);
rsnd_dma_channel_err:

	/*
	 * DMA failed. try to PIO mode
	 * see
	 *	rsnd_ssi_fallback()
	 *	rsnd_rdai_continuance_probe()
	 */
	return -EAGAIN;
}

static void rsnd_dmaen_quit(struct rsnd_dma *dma)
{
	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);

	if (dmaen->chan)
		dma_release_channel(dmaen->chan);

	dmaen->chan = NULL;
}

static struct rsnd_dma_ops rsnd_dmaen_ops = {
	.start	= rsnd_dmaen_start,
	.stop	= rsnd_dmaen_stop,
	.init	= rsnd_dmaen_init,
	.quit	= rsnd_dmaen_quit,
};

/*
 *		Audio DMAC peri peri
 */
static const u8 gen2_id_table_ssiu[] = {
	0x00, /* SSI00 */
	0x04, /* SSI10 */
	0x08, /* SSI20 */
	0x0c, /* SSI3  */
	0x0d, /* SSI4  */
	0x0e, /* SSI5  */
	0x0f, /* SSI6  */
	0x10, /* SSI7  */
	0x11, /* SSI8  */
	0x12, /* SSI90 */
};
static const u8 gen2_id_table_scu[] = {
	0x2d, /* SCU_SRCI0 */
	0x2e, /* SCU_SRCI1 */
	0x2f, /* SCU_SRCI2 */
	0x30, /* SCU_SRCI3 */
	0x31, /* SCU_SRCI4 */
	0x32, /* SCU_SRCI5 */
	0x33, /* SCU_SRCI6 */
	0x34, /* SCU_SRCI7 */
	0x35, /* SCU_SRCI8 */
	0x36, /* SCU_SRCI9 */
};
static const u8 gen2_id_table_cmd[] = {
	0x37, /* SCU_CMD0 */
	0x38, /* SCU_CMD1 */
};

static u32 rsnd_dmapp_get_id(struct rsnd_mod *mod)
{
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
	const u8 *entry = NULL;
	int id = rsnd_mod_id(mod);
	int size = 0;

	if (mod == ssi) {
		entry = gen2_id_table_ssiu;
		size = ARRAY_SIZE(gen2_id_table_ssiu);
	} else if (mod == src) {
		entry = gen2_id_table_scu;
		size = ARRAY_SIZE(gen2_id_table_scu);
	} else if (mod == dvc) {
		entry = gen2_id_table_cmd;
		size = ARRAY_SIZE(gen2_id_table_cmd);
	}

	if (!entry)
		return 0xFF;

	if (size <= id)
		return 0xFF;

	return entry[id];
}

static u32 rsnd_dmapp_get_chcr(struct rsnd_mod *mod_from,
			       struct rsnd_mod *mod_to)
{
	return	(rsnd_dmapp_get_id(mod_from) << 24) +
		(rsnd_dmapp_get_id(mod_to) << 16);
}

#define rsnd_dmapp_addr(dmac, dma, reg) \
	(dmac->base + 0x20 + reg + \
	 (0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	struct device *dev = rsnd_priv_to_dev(priv);

	dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);

	iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
}

static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);

	return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
}

static void rsnd_dmapp_stop(struct rsnd_dma *dma)
{
	int i;

	rsnd_dmapp_write(dma, 0, PDMACHCR);

	for (i = 0; i < 1024; i++) {
		if (0 == rsnd_dmapp_read(dma, PDMACHCR))
			return;
		udelay(1);
	}
}

static void rsnd_dmapp_start(struct rsnd_dma *dma)
{
	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);

	rsnd_dmapp_write(dma, dma->src_addr,	PDMASAR);
	rsnd_dmapp_write(dma, dma->dst_addr,	PDMADAR);
	rsnd_dmapp_write(dma, dmapp->chcr,	PDMACHCR);
}

static int rsnd_dmapp_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id,
			   struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
{
	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	struct device *dev = rsnd_priv_to_dev(priv);

	dmapp->dmapp_id = dmac->dmapp_num;
	dmapp->chcr = rsnd_dmapp_get_chcr(mod_from, mod_to) | PDMACHCR_DE;

	dmac->dmapp_num++;

	rsnd_dmapp_stop(dma);

	dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
		dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);

	return 0;
}

static struct rsnd_dma_ops rsnd_dmapp_ops = {
	.start	= rsnd_dmapp_start,
	.stop	= rsnd_dmapp_stop,
	.init	= rsnd_dmapp_init,
	.quit	= rsnd_dmapp_stop,
};

/*
 *		Common DMAC Interface
 */

/*
 *	DMA read/write register offset
 *
 *	RSND_xxx_I_N	for Audio DMAC input
 *	RSND_xxx_O_N	for Audio DMAC output
 *	RSND_xxx_I_P	for Audio DMAC peri peri input
 *	RSND_xxx_O_P	for Audio DMAC peri peri output
 *
 *	ex) R-Car H2 case
 *	      mod        / DMAC in    / DMAC out   / DMAC PP in / DMAC pp out
 *	SSI : 0xec541000 / 0xec241008 / 0xec24100c
 *	SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
 *	SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
 *	CMD : 0xec500000 /            / 0xec008000                0xec308000
 */
#define RDMA_SSI_I_N(addr, i)	(addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
#define RDMA_SSI_O_N(addr, i)	(addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)

#define RDMA_SSIU_I_N(addr, i)	(addr ##_reg - 0x00441000 + (0x1000 * i))
#define RDMA_SSIU_O_N(addr, i)	(addr ##_reg - 0x00441000 + (0x1000 * i))

#define RDMA_SSIU_I_P(addr, i)	(addr ##_reg - 0x00141000 + (0x1000 * i))
#define RDMA_SSIU_O_P(addr, i)	(addr ##_reg - 0x00141000 + (0x1000 * i))

#define RDMA_SRC_I_N(addr, i)	(addr ##_reg - 0x00500000 + (0x400 * i))
#define RDMA_SRC_O_N(addr, i)	(addr ##_reg - 0x004fc000 + (0x400 * i))

#define RDMA_SRC_I_P(addr, i)	(addr ##_reg - 0x00200000 + (0x400 * i))
#define RDMA_SRC_O_P(addr, i)	(addr ##_reg - 0x001fc000 + (0x400 * i))

#define RDMA_CMD_O_N(addr, i)	(addr ##_reg - 0x004f8000 + (0x400 * i))
#define RDMA_CMD_O_P(addr, i)	(addr ##_reg - 0x001f8000 + (0x400 * i))

static dma_addr_t
rsnd_gen2_dma_addr(struct rsnd_priv *priv,
		   struct rsnd_mod *mod,
		   int is_play, int is_from)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
	phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
	int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
	int use_src = !!rsnd_io_to_mod_src(io);
	int use_dvc = !!rsnd_io_to_mod_dvc(io);
	int id = rsnd_mod_id(mod);
	struct dma_addr {
		dma_addr_t out_addr;
		dma_addr_t in_addr;
	} dma_addrs[3][2][3] = {
		/* SRC */
		{{{ 0,				0 },
		  /* Capture */
		  { RDMA_SRC_O_N(src, id),	RDMA_SRC_I_P(src, id) },
		  { RDMA_CMD_O_N(src, id),	RDMA_SRC_I_P(src, id) } },
		 /* Playback */
		 {{ 0,				0, },
		  { RDMA_SRC_O_P(src, id),	RDMA_SRC_I_N(src, id) },
		  { RDMA_CMD_O_P(src, id),	RDMA_SRC_I_N(src, id) } }
		},
		/* SSI */
		/* Capture */
		{{{ RDMA_SSI_O_N(ssi, id),	0 },
		  { RDMA_SSIU_O_P(ssi, id),	0 },
		  { RDMA_SSIU_O_P(ssi, id),	0 } },
		 /* Playback */
		 {{ 0,				RDMA_SSI_I_N(ssi, id) },
		  { 0,				RDMA_SSIU_I_P(ssi, id) },
		  { 0,				RDMA_SSIU_I_P(ssi, id) } }
		},
		/* SSIU */
		/* Capture */
		{{{ RDMA_SSIU_O_N(ssi, id),	0 },
		  { RDMA_SSIU_O_P(ssi, id),	0 },
		  { RDMA_SSIU_O_P(ssi, id),	0 } },
		 /* Playback */
		 {{ 0,				RDMA_SSIU_I_N(ssi, id) },
		  { 0,				RDMA_SSIU_I_P(ssi, id) },
		  { 0,				RDMA_SSIU_I_P(ssi, id) } } },
	};

	/* it shouldn't happen */
	if (use_dvc && !use_src)
		dev_err(dev, "DVC is selected without SRC\n");

	/* use SSIU or SSI ? */
	if (is_ssi && rsnd_ssi_use_busif(mod))
		is_ssi++;

	return (is_from) ?
		dma_addrs[is_ssi][is_play][use_src + use_dvc].out_addr :
		dma_addrs[is_ssi][is_play][use_src + use_dvc].in_addr;
}

static dma_addr_t rsnd_dma_addr(struct rsnd_priv *priv,
				struct rsnd_mod *mod,
				int is_play, int is_from)
{
	/*
	 * gen1 uses default DMA addr
	 */
	if (rsnd_is_gen1(priv))
		return 0;

	if (!mod)
		return 0;

	return rsnd_gen2_dma_addr(priv, mod, is_play, is_from);
}

#define MOD_MAX 4 /* MEM/SSI/SRC/DVC */
static void rsnd_dma_of_path(struct rsnd_dma *dma,
			     int is_play,
			     struct rsnd_mod **mod_from,
			     struct rsnd_mod **mod_to)
{
	struct rsnd_mod *this = rsnd_dma_to_mod(dma);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(this);
	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
	struct rsnd_mod *mod[MOD_MAX];
	int i, index;


	for (i = 0; i < MOD_MAX; i++)
		mod[i] = NULL;

	/*
	 * in play case...
	 *
	 * src -> dst
	 *
	 * mem -> SSI
	 * mem -> SRC -> SSI
	 * mem -> SRC -> DVC -> SSI
	 */
	mod[0] = NULL; /* for "mem" */
	index = 1;
	for (i = 1; i < MOD_MAX; i++) {
		if (!src) {
			mod[i] = ssi;
		} else if (!dvc) {
			mod[i] = src;
			src = NULL;
		} else {
			if ((!is_play) && (this == src))
				this = dvc;

			mod[i] = (is_play) ? src : dvc;
			i++;
			mod[i] = (is_play) ? dvc : src;
			src = NULL;
			dvc = NULL;
		}

		if (mod[i] == this)
			index = i;

		if (mod[i] == ssi)
			break;
	}

	if (is_play) {
		*mod_from = mod[index - 1];
		*mod_to   = mod[index];
	} else {
		*mod_from = mod[index];
		*mod_to   = mod[index - 1];
	}
}

void rsnd_dma_stop(struct rsnd_dma *dma)
{
	dma->ops->stop(dma);
}

void rsnd_dma_start(struct rsnd_dma *dma)
{
	dma->ops->start(dma);
}

void rsnd_dma_quit(struct rsnd_dma *dma)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);

	if (!dmac)
		return;

	dma->ops->quit(dma);
}

int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma, int id)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_mod *mod_from;
	struct rsnd_mod *mod_to;
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	int is_play = rsnd_io_is_play(io);

	/*
	 * DMA failed. try to PIO mode
	 * see
	 *	rsnd_ssi_fallback()
	 *	rsnd_rdai_continuance_probe()
	 */
	if (!dmac)
		return -EAGAIN;

	rsnd_dma_of_path(dma, is_play, &mod_from, &mod_to);

	dma->src_addr = rsnd_dma_addr(priv, mod_from, is_play, 1);
	dma->dst_addr = rsnd_dma_addr(priv, mod_to,   is_play, 0);

	/* for Gen2 */
	if (mod_from && mod_to)
		dma->ops = &rsnd_dmapp_ops;
	else
		dma->ops = &rsnd_dmaen_ops;

	/* for Gen1, overwrite */
	if (rsnd_is_gen1(priv))
		dma->ops = &rsnd_dmaen_ops;

	return dma->ops->init(priv, dma, id, mod_from, mod_to);
}

int rsnd_dma_probe(struct platform_device *pdev,
		   const struct rsnd_of_data *of_data,
		   struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_dma_ctrl *dmac;
	struct resource *res;

	/*
	 * for Gen1
	 */
	if (rsnd_is_gen1(priv))
		return 0;

	/*
	 * for Gen2
	 */
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
	dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
	if (!dmac || !res) {
		dev_err(dev, "dma allocate failed\n");
		return 0; /* it will be PIO mode */
	}

	dmac->dmapp_num = 0;
	dmac->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(dmac->base))
		return PTR_ERR(dmac->base);

	priv->dma = dmac;

	return 0;
}
Commit	Line	Data
bfe834be KM	1	/*
	2	* Renesas R-Car Audio DMAC support
	3	*
	4	* Copyright (C) 2015 Renesas Electronics Corp.
	5	* Copyright (c) 2015 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
288f392e	11	#include <linux/delay.h>
72adc61f	12	#include <linux/of_dma.h>
bfe834be KM	13	#include "rsnd.h"
bfe834be KM	14
288f392e KM	15	/*
	16	* Audio DMAC peri peri register
	17	*/
	18	#define PDMASAR 0x00
	19	#define PDMADAR 0x04
	20	#define PDMACHCR 0x0c
	21
	22	/* PDMACHCR */
	23	#define PDMACHCR_DE (1 << 0)
	24
	25	struct rsnd_dma_ctrl {
	26	void __iomem *base;
	27	int dmapp_num;
	28	};
	29
	30	#define rsnd_priv_to_dmac(p) ((struct rsnd_dma_ctrl *)(p)->dma)
	31
	32	/*
	33	* Audio DMAC
	34	*/
3c68565b	35	static void rsnd_dmaen_complete(void *data)
bfe834be KM	36	{
	37	struct rsnd_dma dma = (struct rsnd_dma )data;
	38	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	39	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	40
	41	/*
	42	* Renesas sound Gen1 needs 1 DMAC,
	43	* Gen2 needs 2 DMAC.
	44	* In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
	45	* But, Audio-DMAC-peri-peri doesn't have interrupt,
	46	* and this driver is assuming that here.
	47	*
	48	* If Audio-DMAC-peri-peri has interrpt,
	49	* rsnd_dai_pointer_update() will be called twice,
	50	* ant it will breaks io->byte_pos
	51	*/
	52
	53	rsnd_dai_pointer_update(io, io->byte_per_period);
	54	}
	55
3c68565b	56	static void rsnd_dmaen_stop(struct rsnd_dma *dma)
bfe834be	57	{
0d00a521 KM	58	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
	59
	60	dmaengine_terminate_all(dmaen->chan);
bfe834be KM	61	}
bfe834be KM	62
3c68565b	63	static void rsnd_dmaen_start(struct rsnd_dma *dma)
bfe834be	64	{
0d00a521	65	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
bfe834be KM	66	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	67	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	68	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	69	struct snd_pcm_substream *substream = io->substream;
	70	struct device *dev = rsnd_priv_to_dev(priv);
	71	struct dma_async_tx_descriptor *desc;
aaf4fce0	72	int is_play = rsnd_io_is_play(io);
bfe834be	73
0d00a521	74	desc = dmaengine_prep_dma_cyclic(dmaen->chan,
bfe834be KM	75	substream->runtime->dma_addr,
	76	snd_pcm_lib_buffer_bytes(substream),
	77	snd_pcm_lib_period_bytes(substream),
aaf4fce0	78	is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM,
bfe834be KM	79	DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
	80
	81	if (!desc) {
	82	dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
	83	return;
	84	}
	85
3c68565b	86	desc->callback = rsnd_dmaen_complete;
bfe834be KM	87	desc->callback_param = dma;
	88
	89	if (dmaengine_submit(desc) < 0) {
	90	dev_err(dev, "dmaengine_submit() fail\n");
	91	return;
	92	}
	93
0d00a521	94	dma_async_issue_pending(dmaen->chan);
bfe834be KM	95	}
bfe834be KM	96
72adc61f KM	97	struct dma_chan rsnd_dma_request_channel(struct device_node of_node,
	98	struct rsnd_mod mod, char name)
	99	{
	100	struct dma_chan *chan;
	101	struct device_node *np;
	102	int i = 0;
	103
	104	for_each_child_of_node(of_node, np) {
	105	if (i == rsnd_mod_id(mod))
	106	break;
	107	i++;
	108	}
	109
	110	chan = of_dma_request_slave_channel(np, name);
	111
	112	of_node_put(np);
	113	of_node_put(of_node);
	114
	115	return chan;
	116	}
	117
	118	static struct dma_chan rsnd_dmaen_request_channel(struct rsnd_mod mod_from,
	119	struct rsnd_mod *mod_to)
	120	{
	121	if ((!mod_from && !mod_to) \|\|
	122	(mod_from && mod_to))
	123	return NULL;
	124
	125	if (mod_from)
	126	return rsnd_mod_dma_req(mod_from);
	127	else
	128	return rsnd_mod_dma_req(mod_to);
	129	}
	130
3c68565b KM	131	static int rsnd_dmaen_init(struct rsnd_priv priv, struct rsnd_dma dma, int id,
3c68565b KM	132	struct rsnd_mod mod_from, struct rsnd_mod mod_to)
bfe834be	133	{
0d00a521	134	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
bfe834be KM	135	struct device *dev = rsnd_priv_to_dev(priv);
	136	struct dma_slave_config cfg = {};
	137	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
bfe834be KM	138	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
bfe834be KM	139	int is_play = rsnd_io_is_play(io);
bfe834be KM	140	int ret;
bfe834be KM	141
0d00a521	142	if (dmaen->chan) {
bfe834be KM	143	dev_err(dev, "it already has dma channel\n");
	144	return -EIO;
	145	}
	146
72adc61f KM	147	if (dev->of_node) {
	148	dmaen->chan = rsnd_dmaen_request_channel(mod_from, mod_to);
	149	} else {
	150	dma_cap_mask_t mask;
bfe834be	151
72adc61f KM	152	dma_cap_zero(mask);
	153	dma_cap_set(DMA_SLAVE, mask);
	154
	155	dmaen->chan = dma_request_channel(mask, shdma_chan_filter,
	156	(void *)id);
	157	}
	158	if (IS_ERR_OR_NULL(dmaen->chan)) {
d1acba2f	159	dmaen->chan = NULL;
72adc61f KM	160	dev_err(dev, "can't get dma channel\n");
	161	goto rsnd_dma_channel_err;
	162	}
bfe834be KM	163
bfe834be KM	164	cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
3c68565b KM	165	cfg.src_addr = dma->src_addr;
3c68565b KM	166	cfg.dst_addr = dma->dst_addr;
bfe834be KM	167	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	168	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	169
72adc61f KM	170	dev_dbg(dev, "dma : %pad -> %pad\n",
72adc61f KM	171	&cfg.src_addr, &cfg.dst_addr);
bfe834be	172
0d00a521	173	ret = dmaengine_slave_config(dmaen->chan, &cfg);
bfe834be KM	174	if (ret < 0)
	175	goto rsnd_dma_init_err;
	176
bfe834be KM	177	return 0;
	178
	179	rsnd_dma_init_err:
	180	rsnd_dma_quit(dma);
	181	rsnd_dma_channel_err:
	182
	183	/*
	184	* DMA failed. try to PIO mode
	185	* see
	186	* rsnd_ssi_fallback()
	187	* rsnd_rdai_continuance_probe()
	188	*/
	189	return -EAGAIN;
	190	}
	191
3c68565b	192	static void rsnd_dmaen_quit(struct rsnd_dma *dma)
bfe834be	193	{
0d00a521 KM	194	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
	195
	196	if (dmaen->chan)
	197	dma_release_channel(dmaen->chan);
bfe834be	198
0d00a521	199	dmaen->chan = NULL;
bfe834be KM	200	}
bfe834be KM	201
3c68565b KM	202	static struct rsnd_dma_ops rsnd_dmaen_ops = {
	203	.start = rsnd_dmaen_start,
	204	.stop = rsnd_dmaen_stop,
	205	.init = rsnd_dmaen_init,
	206	.quit = rsnd_dmaen_quit,
	207	};
	208
288f392e KM	209	/*
	210	* Audio DMAC peri peri
	211	*/
	212	static const u8 gen2_id_table_ssiu[] = {
	213	0x00, /* SSI00 */
	214	0x04, /* SSI10 */
	215	0x08, /* SSI20 */
	216	0x0c, /* SSI3 */
	217	0x0d, /* SSI4 */
	218	0x0e, /* SSI5 */
	219	0x0f, /* SSI6 */
	220	0x10, /* SSI7 */
	221	0x11, /* SSI8 */
	222	0x12, /* SSI90 */
	223	};
	224	static const u8 gen2_id_table_scu[] = {
	225	0x2d, /* SCU_SRCI0 */
	226	0x2e, /* SCU_SRCI1 */
	227	0x2f, /* SCU_SRCI2 */
	228	0x30, /* SCU_SRCI3 */
	229	0x31, /* SCU_SRCI4 */
	230	0x32, /* SCU_SRCI5 */
	231	0x33, /* SCU_SRCI6 */
	232	0x34, /* SCU_SRCI7 */
	233	0x35, /* SCU_SRCI8 */
	234	0x36, /* SCU_SRCI9 */
	235	};
	236	static const u8 gen2_id_table_cmd[] = {
	237	0x37, /* SCU_CMD0 */
	238	0x38, /* SCU_CMD1 */
	239	};
	240
	241	static u32 rsnd_dmapp_get_id(struct rsnd_mod *mod)
	242	{
	243	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	244	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
	245	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
	246	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
	247	const u8 *entry = NULL;
	248	int id = rsnd_mod_id(mod);
	249	int size = 0;
	250
	251	if (mod == ssi) {
	252	entry = gen2_id_table_ssiu;
	253	size = ARRAY_SIZE(gen2_id_table_ssiu);
	254	} else if (mod == src) {
	255	entry = gen2_id_table_scu;
	256	size = ARRAY_SIZE(gen2_id_table_scu);
	257	} else if (mod == dvc) {
	258	entry = gen2_id_table_cmd;
	259	size = ARRAY_SIZE(gen2_id_table_cmd);
	260	}
	261
	262	if (!entry)
	263	return 0xFF;
	264
	265	if (size <= id)
	266	return 0xFF;
	267
	268	return entry[id];
	269	}
	270
	271	static u32 rsnd_dmapp_get_chcr(struct rsnd_mod *mod_from,
	272	struct rsnd_mod *mod_to)
273	{
274	return (rsnd_dmapp_get_id(mod_from) << 24) +
275	(rsnd_dmapp_get_id(mod_to) << 16);
276	}
277
278	#define rsnd_dmapp_addr(dmac, dma, reg) \
0d00a521 KM	279	(dmac->base + 0x20 + reg + \
0d00a521 KM	280	(0x10 * rsnd_dma_to_dmapp(dma)->dmapp_id))
288f392e KM	281	static void rsnd_dmapp_write(struct rsnd_dma *dma, u32 data, u32 reg)
	282	{
	283	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	284	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	285	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	286	struct device *dev = rsnd_priv_to_dev(priv);
	287
	288	dev_dbg(dev, "w %p : %08x\n", rsnd_dmapp_addr(dmac, dma, reg), data);
	289
	290	iowrite32(data, rsnd_dmapp_addr(dmac, dma, reg));
	291	}
	292
	293	static u32 rsnd_dmapp_read(struct rsnd_dma *dma, u32 reg)
	294	{
	295	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	296	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	297	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	298
	299	return ioread32(rsnd_dmapp_addr(dmac, dma, reg));
	300	}
	301
	302	static void rsnd_dmapp_stop(struct rsnd_dma *dma)
	303	{
	304	int i;
	305
	306	rsnd_dmapp_write(dma, 0, PDMACHCR);
	307
	308	for (i = 0; i < 1024; i++) {
	309	if (0 == rsnd_dmapp_read(dma, PDMACHCR))
	310	return;
	311	udelay(1);
	312	}
	313	}
	314
	315	static void rsnd_dmapp_start(struct rsnd_dma *dma)
	316	{
0d00a521 KM	317	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
0d00a521 KM	318
288f392e KM	319	rsnd_dmapp_write(dma, dma->src_addr, PDMASAR);
288f392e KM	320	rsnd_dmapp_write(dma, dma->dst_addr, PDMADAR);
0d00a521	321	rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);
288f392e KM	322	}
	323
	324	static int rsnd_dmapp_init(struct rsnd_priv priv, struct rsnd_dma dma, int id,
	325	struct rsnd_mod mod_from, struct rsnd_mod mod_to)
	326	{
0d00a521	327	struct rsnd_dmapp *dmapp = rsnd_dma_to_dmapp(dma);
288f392e KM	328	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	329	struct device *dev = rsnd_priv_to_dev(priv);
	330
0d00a521 KM	331	dmapp->dmapp_id = dmac->dmapp_num;
0d00a521 KM	332	dmapp->chcr = rsnd_dmapp_get_chcr(mod_from, mod_to) \| PDMACHCR_DE;
288f392e KM	333
	334	dmac->dmapp_num++;
	335
	336	rsnd_dmapp_stop(dma);
	337
6ec6fb6f GU	338	dev_dbg(dev, "id/src/dst/chcr = %d/%pad/%pad/%08x\n",
6ec6fb6f GU	339	dmapp->dmapp_id, &dma->src_addr, &dma->dst_addr, dmapp->chcr);
288f392e KM	340
	341	return 0;
	342	}
	343
	344	static struct rsnd_dma_ops rsnd_dmapp_ops = {
	345	.start = rsnd_dmapp_start,
	346	.stop = rsnd_dmapp_stop,
	347	.init = rsnd_dmapp_init,
	348	.quit = rsnd_dmapp_stop,
	349	};
	350
	351	/*
	352	* Common DMAC Interface
	353	*/
	354
747c71b1 KM	355	/*
	356	* DMA read/write register offset
	357	*
	358	* RSND_xxx_I_N for Audio DMAC input
	359	* RSND_xxx_O_N for Audio DMAC output
	360	* RSND_xxx_I_P for Audio DMAC peri peri input
	361	* RSND_xxx_O_P for Audio DMAC peri peri output
	362	*
	363	* ex) R-Car H2 case
	364	* mod / DMAC in / DMAC out / DMAC PP in / DMAC pp out
	365	* SSI : 0xec541000 / 0xec241008 / 0xec24100c
	366	* SSIU: 0xec541000 / 0xec100000 / 0xec100000 / 0xec400000 / 0xec400000
	367	* SCU : 0xec500000 / 0xec000000 / 0xec004000 / 0xec300000 / 0xec304000
	368	* CMD : 0xec500000 / / 0xec008000 0xec308000
	369	*/
	370	#define RDMA_SSI_I_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0x8)
	371	#define RDMA_SSI_O_N(addr, i) (addr ##_reg - 0x00300000 + (0x40 * i) + 0xc)
	372
	373	#define RDMA_SSIU_I_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
	374	#define RDMA_SSIU_O_N(addr, i) (addr ##_reg - 0x00441000 + (0x1000 * i))
	375
	376	#define RDMA_SSIU_I_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
	377	#define RDMA_SSIU_O_P(addr, i) (addr ##_reg - 0x00141000 + (0x1000 * i))
	378
	379	#define RDMA_SRC_I_N(addr, i) (addr ##_reg - 0x00500000 + (0x400 * i))
	380	#define RDMA_SRC_O_N(addr, i) (addr ##_reg - 0x004fc000 + (0x400 * i))
	381
	382	#define RDMA_SRC_I_P(addr, i) (addr ##_reg - 0x00200000 + (0x400 * i))
	383	#define RDMA_SRC_O_P(addr, i) (addr ##_reg - 0x001fc000 + (0x400 * i))
	384
	385	#define RDMA_CMD_O_N(addr, i) (addr ##_reg - 0x004f8000 + (0x400 * i))
	386	#define RDMA_CMD_O_P(addr, i) (addr ##_reg - 0x001f8000 + (0x400 * i))
	387
	388	static dma_addr_t
	389	rsnd_gen2_dma_addr(struct rsnd_priv *priv,
	390	struct rsnd_mod *mod,
	391	int is_play, int is_from)
	392	{
	393	struct device *dev = rsnd_priv_to_dev(priv);
	394	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	395	phys_addr_t ssi_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SSI);
	396	phys_addr_t src_reg = rsnd_gen_get_phy_addr(priv, RSND_GEN2_SCU);
	397	int is_ssi = !!(rsnd_io_to_mod_ssi(io) == mod);
	398	int use_src = !!rsnd_io_to_mod_src(io);
	399	int use_dvc = !!rsnd_io_to_mod_dvc(io);
	400	int id = rsnd_mod_id(mod);
	401	struct dma_addr {
	402	dma_addr_t out_addr;
	403	dma_addr_t in_addr;
	404	} dma_addrs[3][2][3] = {
	405	/* SRC */
	406	{{{ 0, 0 },
	407	/* Capture */
	408	{ RDMA_SRC_O_N(src, id), RDMA_SRC_I_P(src, id) },
	409	{ RDMA_CMD_O_N(src, id), RDMA_SRC_I_P(src, id) } },
	410	/* Playback */
	411	{{ 0, 0, },
	412	{ RDMA_SRC_O_P(src, id), RDMA_SRC_I_N(src, id) },
	413	{ RDMA_CMD_O_P(src, id), RDMA_SRC_I_N(src, id) } }
	414	},
	415	/* SSI */
	416	/* Capture */
	417	{{{ RDMA_SSI_O_N(ssi, id), 0 },
	418	{ RDMA_SSIU_O_P(ssi, id), 0 },
419	{ RDMA_SSIU_O_P(ssi, id), 0 } },
420	/* Playback */
421	{{ 0, RDMA_SSI_I_N(ssi, id) },
422	{ 0, RDMA_SSIU_I_P(ssi, id) },
423	{ 0, RDMA_SSIU_I_P(ssi, id) } }
424	},
425	/* SSIU */
426	/* Capture */
427	{{{ RDMA_SSIU_O_N(ssi, id), 0 },
428	{ RDMA_SSIU_O_P(ssi, id), 0 },
429	{ RDMA_SSIU_O_P(ssi, id), 0 } },
430	/* Playback */
431	{{ 0, RDMA_SSIU_I_N(ssi, id) },
432	{ 0, RDMA_SSIU_I_P(ssi, id) },
433	{ 0, RDMA_SSIU_I_P(ssi, id) } } },
434	};
435
436	/* it shouldn't happen */
437	if (use_dvc && !use_src)
438	dev_err(dev, "DVC is selected without SRC\n");
439
440	/* use SSIU or SSI ? */
e879a9dd	441	if (is_ssi && rsnd_ssi_use_busif(mod))
747c71b1 KM	442	is_ssi++;
	443
	444	return (is_from) ?
	445	dma_addrs[is_ssi][is_play][use_src + use_dvc].out_addr :
	446	dma_addrs[is_ssi][is_play][use_src + use_dvc].in_addr;
	447	}
	448
	449	static dma_addr_t rsnd_dma_addr(struct rsnd_priv *priv,
	450	struct rsnd_mod *mod,
	451	int is_play, int is_from)
	452	{
	453	/*
	454	* gen1 uses default DMA addr
	455	*/
	456	if (rsnd_is_gen1(priv))
	457	return 0;
	458
	459	if (!mod)
	460	return 0;
	461
	462	return rsnd_gen2_dma_addr(priv, mod, is_play, is_from);
	463	}
	464
	465	#define MOD_MAX 4 /* MEM/SSI/SRC/DVC */
bfe834be KM	466	static void rsnd_dma_of_path(struct rsnd_dma *dma,
	467	int is_play,
	468	struct rsnd_mod **mod_from,
	469	struct rsnd_mod **mod_to)
	470	{
	471	struct rsnd_mod *this = rsnd_dma_to_mod(dma);
	472	struct rsnd_dai_stream *io = rsnd_mod_to_io(this);
	473	struct rsnd_mod *ssi = rsnd_io_to_mod_ssi(io);
	474	struct rsnd_mod *src = rsnd_io_to_mod_src(io);
	475	struct rsnd_mod *dvc = rsnd_io_to_mod_dvc(io);
	476	struct rsnd_mod *mod[MOD_MAX];
	477	int i, index;
	478
	479
	480	for (i = 0; i < MOD_MAX; i++)
	481	mod[i] = NULL;
	482
	483	/*
	484	* in play case...
	485	*
	486	* src -> dst
	487	*
	488	* mem -> SSI
	489	* mem -> SRC -> SSI
	490	* mem -> SRC -> DVC -> SSI
	491	*/
	492	mod[0] = NULL; /* for "mem" */
	493	index = 1;
	494	for (i = 1; i < MOD_MAX; i++) {
	495	if (!src) {
	496	mod[i] = ssi;
	497	} else if (!dvc) {
	498	mod[i] = src;
	499	src = NULL;
	500	} else {
	501	if ((!is_play) && (this == src))
	502	this = dvc;
	503
	504	mod[i] = (is_play) ? src : dvc;
	505	i++;
	506	mod[i] = (is_play) ? dvc : src;
	507	src = NULL;
	508	dvc = NULL;
	509	}
	510
	511	if (mod[i] == this)
	512	index = i;
	513
	514	if (mod[i] == ssi)
	515	break;
	516	}
	517
	518	if (is_play) {
	519	*mod_from = mod[index - 1];
	520	*mod_to = mod[index];
	521	} else {
	522	*mod_from = mod[index];
	523	*mod_to = mod[index - 1];
	524	}
	525	}
	526
3c68565b KM	527	void rsnd_dma_stop(struct rsnd_dma *dma)
	528	{
	529	dma->ops->stop(dma);
	530	}
	531
	532	void rsnd_dma_start(struct rsnd_dma *dma)
	533	{
	534	dma->ops->start(dma);
	535	}
	536
	537	void rsnd_dma_quit(struct rsnd_dma *dma)
	538	{
8537483a KM	539	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	540	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	541	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
	542
	543	if (!dmac)
	544	return;
	545
3c68565b KM	546	dma->ops->quit(dma);
	547	}
	548
	549	int rsnd_dma_init(struct rsnd_priv priv, struct rsnd_dma dma, int id)
	550	{
	551	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	552	struct rsnd_mod *mod_from;
	553	struct rsnd_mod *mod_to;
	554	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
8537483a	555	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
3c68565b KM	556	int is_play = rsnd_io_is_play(io);
3c68565b KM	557
8537483a KM	558	/*
	559	* DMA failed. try to PIO mode
	560	* see
	561	* rsnd_ssi_fallback()
	562	* rsnd_rdai_continuance_probe()
	563	*/
	564	if (!dmac)
	565	return -EAGAIN;
	566
3c68565b KM	567	rsnd_dma_of_path(dma, is_play, &mod_from, &mod_to);
	568
	569	dma->src_addr = rsnd_dma_addr(priv, mod_from, is_play, 1);
	570	dma->dst_addr = rsnd_dma_addr(priv, mod_to, is_play, 0);
	571
288f392e KM	572	/* for Gen2 */
	573	if (mod_from && mod_to)
	574	dma->ops = &rsnd_dmapp_ops;
	575	else
	576	dma->ops = &rsnd_dmaen_ops;
	577
	578	/* for Gen1, overwrite */
	579	if (rsnd_is_gen1(priv))
	580	dma->ops = &rsnd_dmaen_ops;
3c68565b KM	581
	582	return dma->ops->init(priv, dma, id, mod_from, mod_to);
	583	}
288f392e KM	584
	585	int rsnd_dma_probe(struct platform_device *pdev,
	586	const struct rsnd_of_data *of_data,
	587	struct rsnd_priv *priv)
	588	{
	589	struct device *dev = rsnd_priv_to_dev(priv);
	590	struct rsnd_dma_ctrl *dmac;
	591	struct resource *res;
	592
	593	/*
	594	* for Gen1
	595	*/
	596	if (rsnd_is_gen1(priv))
	597	return 0;
	598
	599	/*
	600	* for Gen2
	601	*/
	602	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "audmapp");
	603	dmac = devm_kzalloc(dev, sizeof(*dmac), GFP_KERNEL);
	604	if (!dmac \|\| !res) {
	605	dev_err(dev, "dma allocate failed\n");
8537483a	606	return 0; /* it will be PIO mode */
288f392e KM	607	}
	608
	609	dmac->dmapp_num = 0;
	610	dmac->base = devm_ioremap_resource(dev, res);
	611	if (IS_ERR(dmac->base))
	612	return PTR_ERR(dmac->base);
	613
	614	priv->dma = dmac;
	615
	616	return 0;
	617	}