[linux-2.6-block.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/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 ? pdata->dma_slave_tx_b :
			pdata->dma_slave_tx_a;
	} else {
		siu_stream = &port_info->capture;
		param = &siu_stream->param;
		param->slave_id = port ? pdata->dma_slave_rx_b :
			pdata->dma_slave_rx_a;
	}

	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
895d4509 GL	34	#include <asm/siu.h>
	35
	36	#include "siu.h"
	37
	38	#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
	39	((buf_bytes) / (period_bytes))
	40	#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
	41	((buf_addr) + ((period_num) * (period_bytes)))
	42
	43	#define RWF_STM_RD 0x01 /* Read in progress */
	44	#define RWF_STM_WT 0x02 /* Write in progress */
	45
	46	struct siu_port *siu_ports[SIU_PORT_NUM];
	47
	48	/* transfersize is number of u32 dma transfers per period */
	49	static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
	50	{
	51	struct siu_info *info = siu_i2s_dai.private_data;
	52	u32 __iomem *base = info->reg;
	53	struct siu_stream *siu_stream = &port_info->playback;
	54	u32 stfifo;
	55
	56	if (!siu_stream->rw_flg)
	57	return -EPERM;
	58
	59	/* output FIFO disable */
	60	stfifo = siu_read32(base + SIU_STFIFO);
	61	siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
	62	pr_debug("%s: STFIFO %x -> %x\n", __func__,
	63	stfifo, stfifo & ~0x0c180c18);
	64
	65	/* during stmwrite clear */
	66	siu_stream->rw_flg = 0;
	67
	68	return 0;
	69	}
	70
	71	static int siu_pcm_stmwrite_start(struct siu_port *port_info)
	72	{
	73	struct siu_stream *siu_stream = &port_info->playback;
	74
	75	if (siu_stream->rw_flg)
	76	return -EPERM;
	77
	78	/* Current period in buffer */
	79	port_info->playback.cur_period = 0;
	80
	81	/* during stmwrite flag set */
	82	siu_stream->rw_flg = RWF_STM_WT;
	83
	84	/* DMA transfer start */
	85	tasklet_schedule(&siu_stream->tasklet);
	86
	87	return 0;
	88	}
	89
	90	static void siu_dma_tx_complete(void *arg)
	91	{
	92	struct siu_stream *siu_stream = arg;
	93
	94	if (!siu_stream->rw_flg)
	95	return;
	96
	97	/* Update completed period count */
98	if (++siu_stream->cur_period >=
99	GET_MAX_PERIODS(siu_stream->buf_bytes,
100	siu_stream->period_bytes))
101	siu_stream->cur_period = 0;
102
103	pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
104	__func__, siu_stream->cur_period,
105	siu_stream->cur_period * siu_stream->period_bytes,
106	siu_stream->buf_bytes, siu_stream->cookie);
107
108	tasklet_schedule(&siu_stream->tasklet);
109
110	/* Notify alsa: a period is done */
111	snd_pcm_period_elapsed(siu_stream->substream);
112	}
113
114	static int siu_pcm_wr_set(struct siu_port *port_info,
115	dma_addr_t buff, u32 size)
116	{
117	struct siu_info *info = siu_i2s_dai.private_data;
118	u32 __iomem *base = info->reg;
119	struct siu_stream *siu_stream = &port_info->playback;
120	struct snd_pcm_substream *substream = siu_stream->substream;
121	struct device *dev = substream->pcm->card->dev;
122	struct dma_async_tx_descriptor *desc;
123	dma_cookie_t cookie;
124	struct scatterlist sg;
125	u32 stfifo;
126
127	sg_init_table(&sg, 1);
128	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
129	size, offset_in_page(buff));
130	sg_dma_address(&sg) = buff;
131
132	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
133	&sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
134	if (!desc) {
135	dev_err(dev, "Failed to allocate a dma descriptor\n");
136	return -ENOMEM;
137	}
138
139	desc->callback = siu_dma_tx_complete;
140	desc->callback_param = siu_stream;
141	cookie = desc->tx_submit(desc);
142	if (cookie < 0) {
143	dev_err(dev, "Failed to submit a dma transfer\n");
144	return cookie;
145	}
146
147	siu_stream->tx_desc = desc;
148	siu_stream->cookie = cookie;
149
150	dma_async_issue_pending(siu_stream->chan);
151
152	/* only output FIFO enable */
153	stfifo = siu_read32(base + SIU_STFIFO);
154	siu_write32(base + SIU_STFIFO, stfifo \| (port_info->stfifo & 0x0c180c18));
155	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
156	stfifo, stfifo \| (port_info->stfifo & 0x0c180c18));
157
158	return 0;
159	}
160
161	static int siu_pcm_rd_set(struct siu_port *port_info,
162	dma_addr_t buff, size_t size)
163	{
164	struct siu_info *info = siu_i2s_dai.private_data;
165	u32 __iomem *base = info->reg;
166	struct siu_stream *siu_stream = &port_info->capture;
167	struct snd_pcm_substream *substream = siu_stream->substream;
168	struct device *dev = substream->pcm->card->dev;
169	struct dma_async_tx_descriptor *desc;
170	dma_cookie_t cookie;
171	struct scatterlist sg;
172	u32 stfifo;
173
174	dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
175
176	sg_init_table(&sg, 1);
177	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
178	size, offset_in_page(buff));
179	sg_dma_address(&sg) = buff;
180
181	desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
182	&sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT \| DMA_CTRL_ACK);
183	if (!desc) {
184	dev_err(dev, "Failed to allocate dma descriptor\n");
185	return -ENOMEM;
186	}
187
188	desc->callback = siu_dma_tx_complete;
189	desc->callback_param = siu_stream;
190	cookie = desc->tx_submit(desc);
191	if (cookie < 0) {
192	dev_err(dev, "Failed to submit dma descriptor\n");
193	return cookie;
194	}
195
196	siu_stream->tx_desc = desc;
197	siu_stream->cookie = cookie;
198
199	dma_async_issue_pending(siu_stream->chan);
200
201	/* only input FIFO enable */
202	stfifo = siu_read32(base + SIU_STFIFO);
203	siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) \|
204	(port_info->stfifo & 0x13071307));
205	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
206	stfifo, stfifo \| (port_info->stfifo & 0x13071307));
207
208	return 0;
209	}
210
211	static void siu_io_tasklet(unsigned long data)
212	{
213	struct siu_stream siu_stream = (struct siu_stream )data;
214	struct snd_pcm_substream *substream = siu_stream->substream;
215	struct device *dev = substream->pcm->card->dev;
216	struct snd_pcm_runtime *rt = substream->runtime;
217	struct siu_port *port_info = siu_port_info(substream);
218
219	dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
220
221	if (!siu_stream->rw_flg) {
222	dev_dbg(dev, "%s: stream inactive\n", __func__);
223	return;
224	}
225
226	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
227	dma_addr_t buff;
228	size_t count;
229	u8 *virt;
230
231	buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
232	siu_stream->cur_period,
233	siu_stream->period_bytes);
234	virt = PERIOD_OFFSET(rt->dma_area,
235	siu_stream->cur_period,
236	siu_stream->period_bytes);
237	count = siu_stream->period_bytes;
238
239	/* DMA transfer start */
240	siu_pcm_rd_set(port_info, buff, count);
241	} else {
242	siu_pcm_wr_set(port_info,
243	(dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
244	siu_stream->cur_period,
245	siu_stream->period_bytes),
246	siu_stream->period_bytes);
247	}
248	}
249
250	/* Capture */
251	static int siu_pcm_stmread_start(struct siu_port *port_info)
252	{
253	struct siu_stream *siu_stream = &port_info->capture;
254
255	if (siu_stream->xfer_cnt > 0x1000000)
256	return -EINVAL;
257	if (siu_stream->rw_flg)
258	return -EPERM;
259
260	/* Current period in buffer */
261	siu_stream->cur_period = 0;
262
263	/* during stmread flag set */
264	siu_stream->rw_flg = RWF_STM_RD;
265
266	tasklet_schedule(&siu_stream->tasklet);
267
268	return 0;
269	}
270
271	static int siu_pcm_stmread_stop(struct siu_port *port_info)
272	{
273	struct siu_info *info = siu_i2s_dai.private_data;
274	u32 __iomem *base = info->reg;
275	struct siu_stream *siu_stream = &port_info->capture;
276	struct device *dev = siu_stream->substream->pcm->card->dev;
277	u32 stfifo;
278
279	if (!siu_stream->rw_flg)
280	return -EPERM;
281
282	/* input FIFO disable */
283	stfifo = siu_read32(base + SIU_STFIFO);
284	siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
285	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
286	stfifo, stfifo & ~0x13071307);
287
288	/* during stmread flag clear */
289	siu_stream->rw_flg = 0;
290
291	return 0;
292	}
293
294	static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
295	struct snd_pcm_hw_params *hw_params)
296	{
297	struct siu_info *info = siu_i2s_dai.private_data;
298	struct device *dev = ss->pcm->card->dev;
299	int ret;
300
301	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
302
303	ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
304	if (ret < 0)
305	dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
306
307	return ret;
308	}
309
310	static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
311	{
312	struct siu_info *info = siu_i2s_dai.private_data;
313	struct siu_port *port_info = siu_port_info(ss);
314	struct device *dev = ss->pcm->card->dev;
315	struct siu_stream *siu_stream;
316
317	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
318	siu_stream = &port_info->playback;
319	else
320	siu_stream = &port_info->capture;
321
322	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
323
324	return snd_pcm_lib_free_pages(ss);
325	}
326
327	static bool filter(struct dma_chan chan, void slave)
328	{
329	struct sh_dmae_slave *param = slave;
330
331	pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
332
333	if (unlikely(param->dma_dev != chan->device->dev))
334	return false;
335
336	chan->private = param;
337	return true;
338	}
339
340	static int siu_pcm_open(struct snd_pcm_substream *ss)
341	{
342	/* Playback / Capture */
343	struct siu_info *info = siu_i2s_dai.private_data;
344	struct siu_port *port_info = siu_port_info(ss);
345	struct siu_stream *siu_stream;
346	u32 port = info->port_id;
347	struct siu_platform *pdata = siu_i2s_dai.dev->platform_data;
348	struct device *dev = ss->pcm->card->dev;
349	dma_cap_mask_t mask;
350	struct sh_dmae_slave *param;
351
352	dma_cap_zero(mask);
353	dma_cap_set(DMA_SLAVE, mask);
354
355	dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
356
357	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
358	siu_stream = &port_info->playback;
359	param = &siu_stream->param;
10440af1 GL	360	param->slave_id = port ? pdata->dma_slave_tx_b :
10440af1 GL	361	pdata->dma_slave_tx_a;
895d4509 GL	362	} else {
	363	siu_stream = &port_info->capture;
	364	param = &siu_stream->param;
10440af1 GL	365	param->slave_id = port ? pdata->dma_slave_rx_b :
10440af1 GL	366	pdata->dma_slave_rx_a;
895d4509 GL	367	}
	368
	369	param->dma_dev = pdata->dma_dev;
	370	/* Get DMA channel */
	371	siu_stream->chan = dma_request_channel(mask, filter, param);
	372	if (!siu_stream->chan) {
	373	dev_err(dev, "DMA channel allocation failed!\n");
	374	return -EBUSY;
	375	}
	376
	377	siu_stream->substream = ss;
	378
	379	return 0;
	380	}
	381
	382	static int siu_pcm_close(struct snd_pcm_substream *ss)
	383	{
	384	struct siu_info *info = siu_i2s_dai.private_data;
	385	struct device *dev = ss->pcm->card->dev;
	386	struct siu_port *port_info = siu_port_info(ss);
	387	struct siu_stream *siu_stream;
	388
	389	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
	390
	391	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
	392	siu_stream = &port_info->playback;
	393	else
	394	siu_stream = &port_info->capture;
	395
	396	dma_release_channel(siu_stream->chan);
	397	siu_stream->chan = NULL;
	398
	399	siu_stream->substream = NULL;
	400
	401	return 0;
	402	}
	403
	404	static int siu_pcm_prepare(struct snd_pcm_substream *ss)
	405	{
	406	struct siu_info *info = siu_i2s_dai.private_data;
	407	struct siu_port *port_info = siu_port_info(ss);
	408	struct device *dev = ss->pcm->card->dev;
	409	struct snd_pcm_runtime *rt = ss->runtime;
	410	struct siu_stream *siu_stream;
	411	snd_pcm_sframes_t xfer_cnt;
	412
	413	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
	414	siu_stream = &port_info->playback;
	415	else
	416	siu_stream = &port_info->capture;
	417
	418	rt = siu_stream->substream->runtime;
	419
	420	siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
	421	siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
	422
	423	dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
	424	info->port_id, rt->channels, siu_stream->period_bytes);
	425
	426	/* We only support buffers that are multiples of the period */
	427	if (siu_stream->buf_bytes % siu_stream->period_bytes) {
	428	dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
	429	__func__, siu_stream->buf_bytes,
	430	siu_stream->period_bytes);
431	return -EINVAL;
432	}
433
434	xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
435	if (!xfer_cnt \|\| xfer_cnt > 0x1000000)
436	return -EINVAL;
437
438	siu_stream->format = rt->format;
439	siu_stream->xfer_cnt = xfer_cnt;
440
441	dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
442	"format=%d channels=%d xfer_cnt=%d\n", info->port_id,
443	(unsigned long)rt->dma_addr, siu_stream->buf_bytes,
444	siu_stream->period_bytes,
445	siu_stream->format, rt->channels, (int)xfer_cnt);
446
447	return 0;
448	}
449
450	static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
451	{
452	struct siu_info *info = siu_i2s_dai.private_data;
453	struct device *dev = ss->pcm->card->dev;
454	struct siu_port *port_info = siu_port_info(ss);
455	int ret;
456
457	dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
458	info->port_id, port_info, cmd);
459
460	switch (cmd) {
461	case SNDRV_PCM_TRIGGER_START:
462	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
463	ret = siu_pcm_stmwrite_start(port_info);
464	else
465	ret = siu_pcm_stmread_start(port_info);
466
467	if (ret < 0)
468	dev_warn(dev, "%s: start failed on port=%d\n",
469	__func__, info->port_id);
470
471	break;
472	case SNDRV_PCM_TRIGGER_STOP:
473	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
474	siu_pcm_stmwrite_stop(port_info);
475	else
476	siu_pcm_stmread_stop(port_info);
477	ret = 0;
478
479	break;
480	default:
481	dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
482	ret = -EINVAL;
483	}
484
485	return ret;
486	}
487
488	/*
489	* So far only resolution of one period is supported, subject to extending the
490	* dmangine API
491	*/
492	static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
493	{
494	struct device *dev = ss->pcm->card->dev;
495	struct siu_info *info = siu_i2s_dai.private_data;
496	u32 __iomem *base = info->reg;
497	struct siu_port *port_info = siu_port_info(ss);
498	struct snd_pcm_runtime *rt = ss->runtime;
499	size_t ptr;
500	struct siu_stream *siu_stream;
501
502	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
503	siu_stream = &port_info->playback;
504	else
505	siu_stream = &port_info->capture;
506
507	/*
508	* ptr is the offset into the buffer where the dma is currently at. We
509	* check if the dma buffer has just wrapped.
510	*/
511	ptr = PERIOD_OFFSET(rt->dma_addr,
512	siu_stream->cur_period,
513	siu_stream->period_bytes) - rt->dma_addr;
514
515	dev_dbg(dev,
516	"%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
517	__func__, info->port_id, siu_read32(base + SIU_EVNTC),
518	siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
519	siu_stream->cookie);
520
521	if (ptr >= siu_stream->buf_bytes)
522	ptr = 0;
523
524	return bytes_to_frames(ss->runtime, ptr);
525	}
526
527	static int siu_pcm_new(struct snd_card card, struct snd_soc_dai dai,
528	struct snd_pcm *pcm)
529	{
530	/* card->dev == socdev->dev, see snd_soc_new_pcms() */
531	struct siu_info *info = siu_i2s_dai.private_data;
532	struct platform_device *pdev = to_platform_device(card->dev);
533	int ret;
534	int i;
535
536	/* pdev->id selects between SIUA and SIUB */
537	if (pdev->id < 0 \|\| pdev->id >= SIU_PORT_NUM)
538	return -EINVAL;
539
540	info->port_id = pdev->id;
541
542	/*
543	* While the siu has 2 ports, only one port can be on at a time (only 1
544	* SPB). So far all the boards using the siu had only one of the ports
545	* wired to a codec. To simplify things, we only register one port with
546	* alsa. In case both ports are needed, it should be changed here
547	*/
548	for (i = pdev->id; i < pdev->id + 1; i++) {
549	struct siu_port **port_info = &siu_ports[i];
550
551	ret = siu_init_port(i, port_info, card);
552	if (ret < 0)
553	return ret;
554
555	ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
556	SNDRV_DMA_TYPE_DEV, NULL,
557	SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
558	if (ret < 0) {
559	dev_err(card->dev,
560	"snd_pcm_lib_preallocate_pages_for_all() err=%d",
561	ret);
562	goto fail;
563	}
564
565	(*port_info)->pcm = pcm;
566
567	/* IO tasklets */
568	tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
569	(unsigned long)&(*port_info)->playback);
570	tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
571	(unsigned long)&(*port_info)->capture);
572	}
573
574	dev_info(card->dev, "SuperH SIU driver initialized.\n");
575	return 0;
576
577	fail:
578	siu_free_port(siu_ports[pdev->id]);
579	dev_err(card->dev, "SIU: failed to initialize.\n");
580	return ret;
581	}
582
583	static void siu_pcm_free(struct snd_pcm *pcm)
584	{
585	struct platform_device *pdev = to_platform_device(pcm->card->dev);
586	struct siu_port *port_info = siu_ports[pdev->id];
587
588	tasklet_kill(&port_info->capture.tasklet);
589	tasklet_kill(&port_info->playback.tasklet);
590
591	siu_free_port(port_info);
592	snd_pcm_lib_preallocate_free_for_all(pcm);
593
594	dev_dbg(pcm->card->dev, "%s\n", __func__);
595	}
596
597	static struct snd_pcm_ops siu_pcm_ops = {
598	.open = siu_pcm_open,
599	.close = siu_pcm_close,
600	.ioctl = snd_pcm_lib_ioctl,
601	.hw_params = siu_pcm_hw_params,
602	.hw_free = siu_pcm_hw_free,
603	.prepare = siu_pcm_prepare,
604	.trigger = siu_pcm_trigger,
605	.pointer = siu_pcm_pointer_dma,
606	};
607
608	struct snd_soc_platform siu_platform = {
609	.name = "siu-audio",
610	.pcm_ops = &siu_pcm_ops,
611	.pcm_new = siu_pcm_new,
612	.pcm_free = siu_pcm_free,
613	};
614	EXPORT_SYMBOL_GPL(siu_platform);