[net-next-2.6.git] / sound / soc / sh / siu_pcm.c

/*
 * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
 *
 * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/control.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc-dai.h>

#include <asm/dmaengine.h>
#include <asm/siu.h>

#include "siu.h"

#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
				((buf_bytes) / (period_bytes))
#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
				((buf_addr) + ((period_num) * (period_bytes)))

#define RWF_STM_RD		0x01		/* Read in progress */
#define RWF_STM_WT		0x02		/* Write in progress */

struct siu_port *siu_ports[SIU_PORT_NUM];

/* transfersize is number of u32 dma transfers per period */
static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	u32 __iomem *base = info->reg;
	struct siu_stream *siu_stream = &port_info->playback;
	u32 stfifo;

	if (!siu_stream->rw_flg)
		return -EPERM;

	/* output FIFO disable */
	stfifo = siu_read32(base + SIU_STFIFO);
	siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
	pr_debug("%s: STFIFO %x -> %x\n", __func__,
		 stfifo, stfifo & ~0x0c180c18);

	/* during stmwrite clear */
	siu_stream->rw_flg = 0;

	return 0;
}

static int siu_pcm_stmwrite_start(struct siu_port *port_info)
{
	struct siu_stream *siu_stream = &port_info->playback;

	if (siu_stream->rw_flg)
		return -EPERM;

	/* Current period in buffer */
	port_info->playback.cur_period = 0;

	/* during stmwrite flag set */
	siu_stream->rw_flg = RWF_STM_WT;

	/* DMA transfer start */
	tasklet_schedule(&siu_stream->tasklet);

	return 0;
}

static void siu_dma_tx_complete(void *arg)
{
	struct siu_stream *siu_stream = arg;

	if (!siu_stream->rw_flg)
		return;

	/* Update completed period count */
	if (++siu_stream->cur_period >=
	    GET_MAX_PERIODS(siu_stream->buf_bytes,
			    siu_stream->period_bytes))
		siu_stream->cur_period = 0;

	pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
		__func__, siu_stream->cur_period,
		siu_stream->cur_period * siu_stream->period_bytes,
		siu_stream->buf_bytes, siu_stream->cookie);

	tasklet_schedule(&siu_stream->tasklet);

	/* Notify alsa: a period is done */
	snd_pcm_period_elapsed(siu_stream->substream);
}

static int siu_pcm_wr_set(struct siu_port *port_info,
			  dma_addr_t buff, u32 size)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	u32 __iomem *base = info->reg;
	struct siu_stream *siu_stream = &port_info->playback;
	struct snd_pcm_substream *substream = siu_stream->substream;
	struct device *dev = substream->pcm->card->dev;
	struct dma_async_tx_descriptor *desc;
	dma_cookie_t cookie;
	struct scatterlist sg;
	u32 stfifo;

	sg_init_table(&sg, 1);
	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
		    size, offset_in_page(buff));
	sg_dma_address(&sg) = buff;

	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
		&sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc) {
		dev_err(dev, "Failed to allocate a dma descriptor\n");
		return -ENOMEM;
	}

	desc->callback = siu_dma_tx_complete;
	desc->callback_param = siu_stream;
	cookie = desc->tx_submit(desc);
	if (cookie < 0) {
		dev_err(dev, "Failed to submit a dma transfer\n");
		return cookie;
	}

	siu_stream->tx_desc = desc;
	siu_stream->cookie = cookie;

	dma_async_issue_pending(siu_stream->chan);

	/* only output FIFO enable */
	stfifo = siu_read32(base + SIU_STFIFO);
	siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
		stfifo, stfifo | (port_info->stfifo & 0x0c180c18));

	return 0;
}

static int siu_pcm_rd_set(struct siu_port *port_info,
			  dma_addr_t buff, size_t size)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	u32 __iomem *base = info->reg;
	struct siu_stream *siu_stream = &port_info->capture;
	struct snd_pcm_substream *substream = siu_stream->substream;
	struct device *dev = substream->pcm->card->dev;
	struct dma_async_tx_descriptor *desc;
	dma_cookie_t cookie;
	struct scatterlist sg;
	u32 stfifo;

	dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);

	sg_init_table(&sg, 1);
	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
		    size, offset_in_page(buff));
	sg_dma_address(&sg) = buff;

	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
		&sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc) {
		dev_err(dev, "Failed to allocate dma descriptor\n");
		return -ENOMEM;
	}

	desc->callback = siu_dma_tx_complete;
	desc->callback_param = siu_stream;
	cookie = desc->tx_submit(desc);
	if (cookie < 0) {
		dev_err(dev, "Failed to submit dma descriptor\n");
		return cookie;
	}

	siu_stream->tx_desc = desc;
	siu_stream->cookie = cookie;

	dma_async_issue_pending(siu_stream->chan);

	/* only input FIFO enable */
	stfifo = siu_read32(base + SIU_STFIFO);
	siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
		    (port_info->stfifo & 0x13071307));
	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
		stfifo, stfifo | (port_info->stfifo & 0x13071307));

	return 0;
}

static void siu_io_tasklet(unsigned long data)
{
	struct siu_stream *siu_stream = (struct siu_stream *)data;
	struct snd_pcm_substream *substream = siu_stream->substream;
	struct device *dev = substream->pcm->card->dev;
	struct snd_pcm_runtime *rt = substream->runtime;
	struct siu_port *port_info = siu_port_info(substream);

	dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);

	if (!siu_stream->rw_flg) {
		dev_dbg(dev, "%s: stream inactive\n", __func__);
		return;
	}

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		dma_addr_t buff;
		size_t count;
		u8 *virt;

		buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
						siu_stream->cur_period,
						siu_stream->period_bytes);
		virt = PERIOD_OFFSET(rt->dma_area,
				     siu_stream->cur_period,
				     siu_stream->period_bytes);
		count = siu_stream->period_bytes;

		/* DMA transfer start */
		siu_pcm_rd_set(port_info, buff, count);
	} else {
		siu_pcm_wr_set(port_info,
			       (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
						siu_stream->cur_period,
						siu_stream->period_bytes),
			       siu_stream->period_bytes);
	}
}

/* Capture */
static int siu_pcm_stmread_start(struct siu_port *port_info)
{
	struct siu_stream *siu_stream = &port_info->capture;

	if (siu_stream->xfer_cnt > 0x1000000)
		return -EINVAL;
	if (siu_stream->rw_flg)
		return -EPERM;

	/* Current period in buffer */
	siu_stream->cur_period = 0;

	/* during stmread flag set */
	siu_stream->rw_flg = RWF_STM_RD;

	tasklet_schedule(&siu_stream->tasklet);

	return 0;
}

static int siu_pcm_stmread_stop(struct siu_port *port_info)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	u32 __iomem *base = info->reg;
	struct siu_stream *siu_stream = &port_info->capture;
	struct device *dev = siu_stream->substream->pcm->card->dev;
	u32 stfifo;

	if (!siu_stream->rw_flg)
		return -EPERM;

	/* input FIFO disable */
	stfifo = siu_read32(base + SIU_STFIFO);
	siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
		stfifo, stfifo & ~0x13071307);

	/* during stmread flag clear */
	siu_stream->rw_flg = 0;

	return 0;
}

static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
			     struct snd_pcm_hw_params *hw_params)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	struct device *dev = ss->pcm->card->dev;
	int ret;

	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

	ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
	if (ret < 0)
		dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");

	return ret;
}

static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	struct siu_port	*port_info = siu_port_info(ss);
	struct device *dev = ss->pcm->card->dev;
	struct siu_stream *siu_stream;

	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
		siu_stream = &port_info->playback;
	else
		siu_stream = &port_info->capture;

	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

	return snd_pcm_lib_free_pages(ss);
}

static bool filter(struct dma_chan *chan, void *slave)
{
	struct sh_dmae_slave *param = slave;

	pr_debug("%s: slave ID %d\n", __func__, param->slave_id);

	if (unlikely(param->dma_dev != chan->device->dev))
		return false;

	chan->private = param;
	return true;
}

static int siu_pcm_open(struct snd_pcm_substream *ss)
{
	/* Playback / Capture */
	struct siu_info *info = siu_i2s_dai.private_data;
	struct siu_port *port_info = siu_port_info(ss);
	struct siu_stream *siu_stream;
	u32 port = info->port_id;
	struct siu_platform *pdata = siu_i2s_dai.dev->platform_data;
	struct device *dev = ss->pcm->card->dev;
	dma_cap_mask_t mask;
	struct sh_dmae_slave *param;

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

	dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);

	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		siu_stream = &port_info->playback;
		param = &siu_stream->param;
		param->slave_id = port ? SHDMA_SLAVE_SIUB_TX :
			SHDMA_SLAVE_SIUA_TX;
	} else {
		siu_stream = &port_info->capture;
		param = &siu_stream->param;
		param->slave_id = port ? SHDMA_SLAVE_SIUB_RX :
			SHDMA_SLAVE_SIUA_RX;
	}

	param->dma_dev = pdata->dma_dev;
	/* Get DMA channel */
	siu_stream->chan = dma_request_channel(mask, filter, param);
	if (!siu_stream->chan) {
		dev_err(dev, "DMA channel allocation failed!\n");
		return -EBUSY;
	}

	siu_stream->substream = ss;

	return 0;
}

static int siu_pcm_close(struct snd_pcm_substream *ss)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	struct device *dev = ss->pcm->card->dev;
	struct siu_port *port_info = siu_port_info(ss);
	struct siu_stream *siu_stream;

	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);

	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
		siu_stream = &port_info->playback;
	else
		siu_stream = &port_info->capture;

	dma_release_channel(siu_stream->chan);
	siu_stream->chan = NULL;

	siu_stream->substream = NULL;

	return 0;
}

static int siu_pcm_prepare(struct snd_pcm_substream *ss)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	struct siu_port *port_info = siu_port_info(ss);
	struct device *dev = ss->pcm->card->dev;
	struct snd_pcm_runtime 	*rt = ss->runtime;
	struct siu_stream *siu_stream;
	snd_pcm_sframes_t xfer_cnt;

	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
		siu_stream = &port_info->playback;
	else
		siu_stream = &port_info->capture;

	rt = siu_stream->substream->runtime;

	siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
	siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);

	dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
		info->port_id, rt->channels, siu_stream->period_bytes);

	/* We only support buffers that are multiples of the period */
	if (siu_stream->buf_bytes % siu_stream->period_bytes) {
		dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
		       __func__, siu_stream->buf_bytes,
		       siu_stream->period_bytes);
		return -EINVAL;
	}

	xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
	if (!xfer_cnt || xfer_cnt > 0x1000000)
		return -EINVAL;

	siu_stream->format = rt->format;
	siu_stream->xfer_cnt = xfer_cnt;

	dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
		"format=%d channels=%d xfer_cnt=%d\n", info->port_id,
		(unsigned long)rt->dma_addr, siu_stream->buf_bytes,
		siu_stream->period_bytes,
		siu_stream->format, rt->channels, (int)xfer_cnt);

	return 0;
}

static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
{
	struct siu_info *info = siu_i2s_dai.private_data;
	struct device *dev = ss->pcm->card->dev;
	struct siu_port *port_info = siu_port_info(ss);
	int ret;

	dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
		info->port_id, port_info, cmd);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
			ret = siu_pcm_stmwrite_start(port_info);
		else
			ret = siu_pcm_stmread_start(port_info);

		if (ret < 0)
			dev_warn(dev, "%s: start failed on port=%d\n",
				 __func__, info->port_id);

		break;
	case SNDRV_PCM_TRIGGER_STOP:
		if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
			siu_pcm_stmwrite_stop(port_info);
		else
			siu_pcm_stmread_stop(port_info);
		ret = 0;

		break;
	default:
		dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
		ret = -EINVAL;
	}

	return ret;
}

/*
 * So far only resolution of one period is supported, subject to extending the
 * dmangine API
 */
static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
{
	struct device *dev = ss->pcm->card->dev;
	struct siu_info *info = siu_i2s_dai.private_data;
	u32 __iomem *base = info->reg;
	struct siu_port *port_info = siu_port_info(ss);
	struct snd_pcm_runtime *rt = ss->runtime;
	size_t ptr;
	struct siu_stream *siu_stream;

	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
		siu_stream = &port_info->playback;
	else
		siu_stream = &port_info->capture;

	/*
	 * ptr is the offset into the buffer where the dma is currently at. We
	 * check if the dma buffer has just wrapped.
	 */
	ptr = PERIOD_OFFSET(rt->dma_addr,
			    siu_stream->cur_period,
			    siu_stream->period_bytes) - rt->dma_addr;

	dev_dbg(dev,
		"%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
		__func__, info->port_id, siu_read32(base + SIU_EVNTC),
		siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
		siu_stream->cookie);

	if (ptr >= siu_stream->buf_bytes)
		ptr = 0;

	return bytes_to_frames(ss->runtime, ptr);
}

static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
		       struct snd_pcm *pcm)
{
	/* card->dev == socdev->dev, see snd_soc_new_pcms() */
	struct siu_info *info = siu_i2s_dai.private_data;
	struct platform_device *pdev = to_platform_device(card->dev);
	int ret;
	int i;

	/* pdev->id selects between SIUA and SIUB */
	if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
		return -EINVAL;

	info->port_id = pdev->id;

	/*
	 * While the siu has 2 ports, only one port can be on at a time (only 1
	 * SPB). So far all the boards using the siu had only one of the ports
	 * wired to a codec. To simplify things, we only register one port with
	 * alsa. In case both ports are needed, it should be changed here
	 */
	for (i = pdev->id; i < pdev->id + 1; i++) {
		struct siu_port **port_info = &siu_ports[i];

		ret = siu_init_port(i, port_info, card);
		if (ret < 0)
			return ret;

		ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
				SNDRV_DMA_TYPE_DEV, NULL,
				SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
		if (ret < 0) {
			dev_err(card->dev,
			       "snd_pcm_lib_preallocate_pages_for_all() err=%d",
				ret);
			goto fail;
		}

		(*port_info)->pcm = pcm;

		/* IO tasklets */
		tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
			     (unsigned long)&(*port_info)->playback);
		tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
			     (unsigned long)&(*port_info)->capture);
	}

	dev_info(card->dev, "SuperH SIU driver initialized.\n");
	return 0;

fail:
	siu_free_port(siu_ports[pdev->id]);
	dev_err(card->dev, "SIU: failed to initialize.\n");
	return ret;
}

static void siu_pcm_free(struct snd_pcm *pcm)
{
	struct platform_device *pdev = to_platform_device(pcm->card->dev);
	struct siu_port *port_info = siu_ports[pdev->id];

	tasklet_kill(&port_info->capture.tasklet);
	tasklet_kill(&port_info->playback.tasklet);

	siu_free_port(port_info);
	snd_pcm_lib_preallocate_free_for_all(pcm);

	dev_dbg(pcm->card->dev, "%s\n", __func__);
}

static struct snd_pcm_ops siu_pcm_ops = {
	.open		= siu_pcm_open,
	.close		= siu_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= siu_pcm_hw_params,
	.hw_free	= siu_pcm_hw_free,
	.prepare	= siu_pcm_prepare,
	.trigger	= siu_pcm_trigger,
	.pointer	= siu_pcm_pointer_dma,
};

struct snd_soc_platform siu_platform = {
	.name		= "siu-audio",
	.pcm_ops 	= &siu_pcm_ops,
	.pcm_new	= siu_pcm_new,
	.pcm_free	= siu_pcm_free,
};
EXPORT_SYMBOL_GPL(siu_platform);
Commit	Line	Data
895d4509 GL	1	/*
	2	* siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
	3	*
	4	* Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
	5	* Copyright (C) 2006 Carlos Munoz <carlos@kenati.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 as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21	#include <linux/delay.h>
	22	#include <linux/dma-mapping.h>
	23	#include <linux/dmaengine.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/module.h>
	26	#include <linux/platform_device.h>
895d4509 GL	27
	28	#include <sound/control.h>
	29	#include <sound/core.h>
	30	#include <sound/pcm.h>
	31	#include <sound/pcm_params.h>
	32	#include <sound/soc-dai.h>
	33
8b1935e6	34	#include <asm/dmaengine.h>
895d4509 GL	35	#include <asm/siu.h>
	36
	37	#include "siu.h"
	38
	39	#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
	40	((buf_bytes) / (period_bytes))
	41	#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
	42	((buf_addr) + ((period_num) * (period_bytes)))
	43
	44	#define RWF_STM_RD 0x01 /* Read in progress */
	45	#define RWF_STM_WT 0x02 /* Write in progress */
	46
	47	struct siu_port *siu_ports[SIU_PORT_NUM];
	48
	49	/* transfersize is number of u32 dma transfers per period */
	50	static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
	51	{
	52	struct siu_info *info = siu_i2s_dai.private_data;
	53	u32 __iomem *base = info->reg;
	54	struct siu_stream *siu_stream = &port_info->playback;
	55	u32 stfifo;
	56
	57	if (!siu_stream->rw_flg)
	58	return -EPERM;
	59
	60	/* output FIFO disable */
	61	stfifo = siu_read32(base + SIU_STFIFO);
	62	siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
	63	pr_debug("%s: STFIFO %x -> %x\n", __func__,
	64	stfifo, stfifo & ~0x0c180c18);
	65
	66	/* during stmwrite clear */
	67	siu_stream->rw_flg = 0;
	68
	69	return 0;
	70	}
	71
	72	static int siu_pcm_stmwrite_start(struct siu_port *port_info)
	73	{
	74	struct siu_stream *siu_stream = &port_info->playback;
	75
	76	if (siu_stream->rw_flg)
	77	return -EPERM;
	78
	79	/* Current period in buffer */
	80	port_info->playback.cur_period = 0;
	81
	82	/* during stmwrite flag set */
	83	siu_stream->rw_flg = RWF_STM_WT;
	84
	85	/* DMA transfer start */
	86	tasklet_schedule(&siu_stream->tasklet);
	87
	88	return 0;
	89	}
	90
	91	static void siu_dma_tx_complete(void *arg)
	92	{
	93	struct siu_stream *siu_stream = arg;
	94
	95	if (!siu_stream->rw_flg)
	96	return;
	97
	98	/* Update completed period count */
99	if (++siu_stream->cur_period >=
100	GET_MAX_PERIODS(siu_stream->buf_bytes,
101	siu_stream->period_bytes))
102	siu_stream->cur_period = 0;
103
104	pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
105	__func__, siu_stream->cur_period,
106	siu_stream->cur_period * siu_stream->period_bytes,
107	siu_stream->buf_bytes, siu_stream->cookie);
108
109	tasklet_schedule(&siu_stream->tasklet);
110
111	/* Notify alsa: a period is done */
112	snd_pcm_period_elapsed(siu_stream->substream);
113	}
114
115	static int siu_pcm_wr_set(struct siu_port *port_info,
116	dma_addr_t buff, u32 size)
117	{
118	struct siu_info *info = siu_i2s_dai.private_data;
119	u32 __iomem *base = info->reg;
120	struct siu_stream *siu_stream = &port_info->playback;
121	struct snd_pcm_substream *substream = siu_stream->substream;
122	struct device *dev = substream->pcm->card->dev;
123	struct dma_async_tx_descriptor *desc;
124	dma_cookie_t cookie;
125	struct scatterlist sg;
126	u32 stfifo;
127
128	sg_init_table(&sg, 1);
129	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
130	size, offset_in_page(buff));
131	sg_dma_address(&sg) = buff;
132
133	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
134	&sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
135	if (!desc) {
136	dev_err(dev, "Failed to allocate a dma descriptor\n");
137	return -ENOMEM;
138	}
139
140	desc->callback = siu_dma_tx_complete;
141	desc->callback_param = siu_stream;
142	cookie = desc->tx_submit(desc);
143	if (cookie < 0) {
144	dev_err(dev, "Failed to submit a dma transfer\n");
145	return cookie;
146	}
147
148	siu_stream->tx_desc = desc;
149	siu_stream->cookie = cookie;
150
151	dma_async_issue_pending(siu_stream->chan);
152
153	/* only output FIFO enable */
154	stfifo = siu_read32(base + SIU_STFIFO);
155	siu_write32(base + SIU_STFIFO, stfifo \| (port_info->stfifo & 0x0c180c18));
156	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
157	stfifo, stfifo \| (port_info->stfifo & 0x0c180c18));
158
159	return 0;
160	}
161
162	static int siu_pcm_rd_set(struct siu_port *port_info,
163	dma_addr_t buff, size_t size)
164	{
165	struct siu_info *info = siu_i2s_dai.private_data;
166	u32 __iomem *base = info->reg;
167	struct siu_stream *siu_stream = &port_info->capture;
168	struct snd_pcm_substream *substream = siu_stream->substream;
169	struct device *dev = substream->pcm->card->dev;
170	struct dma_async_tx_descriptor *desc;
171	dma_cookie_t cookie;
172	struct scatterlist sg;
173	u32 stfifo;
174
175	dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
176
177	sg_init_table(&sg, 1);
178	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
179	size, offset_in_page(buff));
180	sg_dma_address(&sg) = buff;
181
182	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
183	&sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
184	if (!desc) {
185	dev_err(dev, "Failed to allocate dma descriptor\n");
186	return -ENOMEM;
187	}
188
189	desc->callback = siu_dma_tx_complete;
190	desc->callback_param = siu_stream;
191	cookie = desc->tx_submit(desc);
192	if (cookie < 0) {
193	dev_err(dev, "Failed to submit dma descriptor\n");
194	return cookie;
195	}
196
197	siu_stream->tx_desc = desc;
198	siu_stream->cookie = cookie;
199
200	dma_async_issue_pending(siu_stream->chan);
201
202	/* only input FIFO enable */
203	stfifo = siu_read32(base + SIU_STFIFO);
204	siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) \|
205	(port_info->stfifo & 0x13071307));
206	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
207	stfifo, stfifo \| (port_info->stfifo & 0x13071307));
208
209	return 0;
210	}
211
212	static void siu_io_tasklet(unsigned long data)
213	{
214	struct siu_stream siu_stream = (struct siu_stream )data;
215	struct snd_pcm_substream *substream = siu_stream->substream;
216	struct device *dev = substream->pcm->card->dev;
217	struct snd_pcm_runtime *rt = substream->runtime;
218	struct siu_port *port_info = siu_port_info(substream);
219
220	dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
221
222	if (!siu_stream->rw_flg) {
223	dev_dbg(dev, "%s: stream inactive\n", __func__);
224	return;
225	}
226
227	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
228	dma_addr_t buff;
229	size_t count;
230	u8 *virt;
231
232	buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
233	siu_stream->cur_period,
234	siu_stream->period_bytes);
235	virt = PERIOD_OFFSET(rt->dma_area,
236	siu_stream->cur_period,
237	siu_stream->period_bytes);
238	count = siu_stream->period_bytes;
239
240	/* DMA transfer start */
241	siu_pcm_rd_set(port_info, buff, count);
242	} else {
243	siu_pcm_wr_set(port_info,
244	(dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
245	siu_stream->cur_period,
246	siu_stream->period_bytes),
247	siu_stream->period_bytes);
248	}
249	}
250
251	/* Capture */
252	static int siu_pcm_stmread_start(struct siu_port *port_info)
253	{
254	struct siu_stream *siu_stream = &port_info->capture;
255
256	if (siu_stream->xfer_cnt > 0x1000000)
257	return -EINVAL;
258	if (siu_stream->rw_flg)
259	return -EPERM;
260
261	/* Current period in buffer */
262	siu_stream->cur_period = 0;
263
264	/* during stmread flag set */
265	siu_stream->rw_flg = RWF_STM_RD;
266
267	tasklet_schedule(&siu_stream->tasklet);
268
269	return 0;
270	}
271
272	static int siu_pcm_stmread_stop(struct siu_port *port_info)
273	{
274	struct siu_info *info = siu_i2s_dai.private_data;
275	u32 __iomem *base = info->reg;
276	struct siu_stream *siu_stream = &port_info->capture;
277	struct device *dev = siu_stream->substream->pcm->card->dev;
278	u32 stfifo;
279
280	if (!siu_stream->rw_flg)
281	return -EPERM;
282
283	/* input FIFO disable */
284	stfifo = siu_read32(base + SIU_STFIFO);
285	siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
286	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
287	stfifo, stfifo & ~0x13071307);
288
289	/* during stmread flag clear */
290	siu_stream->rw_flg = 0;
291
292	return 0;
293	}
294
295	static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
296	struct snd_pcm_hw_params *hw_params)
297	{
298	struct siu_info *info = siu_i2s_dai.private_data;
299	struct device *dev = ss->pcm->card->dev;
300	int ret;
301
302	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
303
304	ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
305	if (ret < 0)
306	dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
307
308	return ret;
309	}
310
311	static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
312	{
313	struct siu_info *info = siu_i2s_dai.private_data;
314	struct siu_port *port_info = siu_port_info(ss);
315	struct device *dev = ss->pcm->card->dev;
316	struct siu_stream *siu_stream;
317
318	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
319	siu_stream = &port_info->playback;
320	else
321	siu_stream = &port_info->capture;
322
323	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
324
325	return snd_pcm_lib_free_pages(ss);
326	}
327
328	static bool filter(struct dma_chan chan, void slave)
329	{
330	struct sh_dmae_slave *param = slave;
331
332	pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
333
334	if (unlikely(param->dma_dev != chan->device->dev))
335	return false;
336
337	chan->private = param;
338	return true;
339	}
340
341	static int siu_pcm_open(struct snd_pcm_substream *ss)
342	{
343	/* Playback / Capture */
344	struct siu_info *info = siu_i2s_dai.private_data;
345	struct siu_port *port_info = siu_port_info(ss);
346	struct siu_stream *siu_stream;
347	u32 port = info->port_id;
348	struct siu_platform *pdata = siu_i2s_dai.dev->platform_data;
349	struct device *dev = ss->pcm->card->dev;
350	dma_cap_mask_t mask;
351	struct sh_dmae_slave *param;
352
353	dma_cap_zero(mask);
354	dma_cap_set(DMA_SLAVE, mask);
355
356	dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
357
358	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
359	siu_stream = &port_info->playback;
360	param = &siu_stream->param;
361	param->slave_id = port ? SHDMA_SLAVE_SIUB_TX :
362	SHDMA_SLAVE_SIUA_TX;
363	} else {
364	siu_stream = &port_info->capture;
365	param = &siu_stream->param;
366	param->slave_id = port ? SHDMA_SLAVE_SIUB_RX :
367	SHDMA_SLAVE_SIUA_RX;
368	}
369
370	param->dma_dev = pdata->dma_dev;
371	/* Get DMA channel */
372	siu_stream->chan = dma_request_channel(mask, filter, param);
373	if (!siu_stream->chan) {
374	dev_err(dev, "DMA channel allocation failed!\n");
375	return -EBUSY;
376	}
377
378	siu_stream->substream = ss;
379
380	return 0;
381	}
382
383	static int siu_pcm_close(struct snd_pcm_substream *ss)
384	{
385	struct siu_info *info = siu_i2s_dai.private_data;
386	struct device *dev = ss->pcm->card->dev;
387	struct siu_port *port_info = siu_port_info(ss);
388	struct siu_stream *siu_stream;
389
390	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
391
392	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
393	siu_stream = &port_info->playback;
394	else
395	siu_stream = &port_info->capture;
396
397	dma_release_channel(siu_stream->chan);
398	siu_stream->chan = NULL;
399
400	siu_stream->substream = NULL;
401
402	return 0;
403	}
404
405	static int siu_pcm_prepare(struct snd_pcm_substream *ss)
406	{
407	struct siu_info *info = siu_i2s_dai.private_data;
408	struct siu_port *port_info = siu_port_info(ss);
409	struct device *dev = ss->pcm->card->dev;
410	struct snd_pcm_runtime *rt = ss->runtime;
411	struct siu_stream *siu_stream;
412	snd_pcm_sframes_t xfer_cnt;
413
414	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
415	siu_stream = &port_info->playback;
416	else
417	siu_stream = &port_info->capture;
418
419	rt = siu_stream->substream->runtime;
420
421	siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
422	siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
423
424	dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
425	info->port_id, rt->channels, siu_stream->period_bytes);
426
427	/* We only support buffers that are multiples of the period */
428	if (siu_stream->buf_bytes % siu_stream->period_bytes) {
429	dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
430	__func__, siu_stream->buf_bytes,
431	siu_stream->period_bytes);
432	return -EINVAL;
433	}
434
435	xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
436	if (!xfer_cnt \|\| xfer_cnt > 0x1000000)
437	return -EINVAL;
438
439	siu_stream->format = rt->format;
440	siu_stream->xfer_cnt = xfer_cnt;
441
442	dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
443	"format=%d channels=%d xfer_cnt=%d\n", info->port_id,
444	(unsigned long)rt->dma_addr, siu_stream->buf_bytes,
445	siu_stream->period_bytes,
446	siu_stream->format, rt->channels, (int)xfer_cnt);
447
448	return 0;
449	}
450
451	static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
452	{
453	struct siu_info *info = siu_i2s_dai.private_data;
454	struct device *dev = ss->pcm->card->dev;
455	struct siu_port *port_info = siu_port_info(ss);
456	int ret;
457
458	dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
459	info->port_id, port_info, cmd);
460
461	switch (cmd) {
462	case SNDRV_PCM_TRIGGER_START:
463	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
464	ret = siu_pcm_stmwrite_start(port_info);
465	else
466	ret = siu_pcm_stmread_start(port_info);
467
468	if (ret < 0)
469	dev_warn(dev, "%s: start failed on port=%d\n",
470	__func__, info->port_id);
471
472	break;
473	case SNDRV_PCM_TRIGGER_STOP:
474	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
475	siu_pcm_stmwrite_stop(port_info);
476	else
477	siu_pcm_stmread_stop(port_info);
478	ret = 0;
479
480	break;
481	default:
482	dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
483	ret = -EINVAL;
484	}
485
486	return ret;
487	}
488
489	/*
490	* So far only resolution of one period is supported, subject to extending the
491	* dmangine API
492	*/
493	static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
494	{
495	struct device *dev = ss->pcm->card->dev;
496	struct siu_info *info = siu_i2s_dai.private_data;
497	u32 __iomem *base = info->reg;
498	struct siu_port *port_info = siu_port_info(ss);
499	struct snd_pcm_runtime *rt = ss->runtime;
500	size_t ptr;
501	struct siu_stream *siu_stream;
502
503	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
504	siu_stream = &port_info->playback;
505	else
506	siu_stream = &port_info->capture;
507
508	/*
509	* ptr is the offset into the buffer where the dma is currently at. We
510	* check if the dma buffer has just wrapped.
511	*/
512	ptr = PERIOD_OFFSET(rt->dma_addr,
513	siu_stream->cur_period,
514	siu_stream->period_bytes) - rt->dma_addr;
515
516	dev_dbg(dev,
517	"%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
518	__func__, info->port_id, siu_read32(base + SIU_EVNTC),
519	siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
520	siu_stream->cookie);
521
522	if (ptr >= siu_stream->buf_bytes)
523	ptr = 0;
524
525	return bytes_to_frames(ss->runtime, ptr);
526	}
527
528	static int siu_pcm_new(struct snd_card card, struct snd_soc_dai dai,
529	struct snd_pcm *pcm)
530	{
531	/* card->dev == socdev->dev, see snd_soc_new_pcms() */
532	struct siu_info *info = siu_i2s_dai.private_data;
533	struct platform_device *pdev = to_platform_device(card->dev);
534	int ret;
535	int i;
536
537	/* pdev->id selects between SIUA and SIUB */
538	if (pdev->id < 0 \|\| pdev->id >= SIU_PORT_NUM)
539	return -EINVAL;
540
541	info->port_id = pdev->id;
542
543	/*
544	* While the siu has 2 ports, only one port can be on at a time (only 1
545	* SPB). So far all the boards using the siu had only one of the ports
546	* wired to a codec. To simplify things, we only register one port with
547	* alsa. In case both ports are needed, it should be changed here
548	*/
549	for (i = pdev->id; i < pdev->id + 1; i++) {
550	struct siu_port **port_info = &siu_ports[i];
551
552	ret = siu_init_port(i, port_info, card);
553	if (ret < 0)
554	return ret;
555
556	ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
557	SNDRV_DMA_TYPE_DEV, NULL,
558	SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
559	if (ret < 0) {
560	dev_err(card->dev,
561	"snd_pcm_lib_preallocate_pages_for_all() err=%d",
562	ret);
563	goto fail;
564	}
565
566	(*port_info)->pcm = pcm;
567
568	/* IO tasklets */
569	tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
570	(unsigned long)&(*port_info)->playback);
571	tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
572	(unsigned long)&(*port_info)->capture);
573	}
574
575	dev_info(card->dev, "SuperH SIU driver initialized.\n");
576	return 0;
577
578	fail:
579	siu_free_port(siu_ports[pdev->id]);
580	dev_err(card->dev, "SIU: failed to initialize.\n");
581	return ret;
582	}
583
584	static void siu_pcm_free(struct snd_pcm *pcm)
585	{
586	struct platform_device *pdev = to_platform_device(pcm->card->dev);
587	struct siu_port *port_info = siu_ports[pdev->id];
588
589	tasklet_kill(&port_info->capture.tasklet);
590	tasklet_kill(&port_info->playback.tasklet);
591
592	siu_free_port(port_info);
593	snd_pcm_lib_preallocate_free_for_all(pcm);
594
595	dev_dbg(pcm->card->dev, "%s\n", __func__);
596	}
597
598	static struct snd_pcm_ops siu_pcm_ops = {
599	.open = siu_pcm_open,
600	.close = siu_pcm_close,
601	.ioctl = snd_pcm_lib_ioctl,
602	.hw_params = siu_pcm_hw_params,
603	.hw_free = siu_pcm_hw_free,
604	.prepare = siu_pcm_prepare,
605	.trigger = siu_pcm_trigger,
606	.pointer = siu_pcm_pointer_dma,
607	};
608
609	struct snd_soc_platform siu_platform = {
610	.name = "siu-audio",
611	.pcm_ops = &siu_pcm_ops,
612	.pcm_new = siu_pcm_new,
613	.pcm_free = siu_pcm_free,
614	};
615	EXPORT_SYMBOL_GPL(siu_platform);