swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
Tip revision: f6f94e2ab1b33f0082ac22d71f66385a60d8157f authored by Linus Torvalds on 20 October 2010, 20:30:22 UTC
Linux 2.6.36
Linux 2.6.36
Tip revision: f6f94e2
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);