--- /dev/null
+/*
+ * 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.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_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_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_len(&sg) = size;
+ sg_dma_address(&sg) = buff;
+
+ desc = dmaengine_prep_slave_sg(siu_stream->chan,
+ &sg, 1, DMA_MEM_TO_DEV, 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 = dmaengine_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_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_len(&sg) = size;
+ sg_dma_address(&sg) = buff;
+
+ desc = dmaengine_prep_slave_sg(siu_stream->chan,
+ &sg, 1, DMA_DEV_TO_MEM, 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 = dmaengine_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_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_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_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->shdma_slave.slave_id);
+
+ chan->private = ¶m->shdma_slave;
+ return true;
+}
+
+static int siu_pcm_open(struct snd_pcm_substream *ss)
+{
+ /* Playback / Capture */
+ struct snd_soc_pcm_runtime *rtd = ss->private_data;
+ struct siu_platform *pdata = rtd->platform->dev->platform_data;
+ struct siu_info *info = siu_i2s_data;
+ struct siu_port *port_info = siu_port_info(ss);
+ struct siu_stream *siu_stream;
+ u32 port = info->port_id;
+ 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->shdma_slave.slave_id = port ? pdata->dma_slave_tx_b :
+ pdata->dma_slave_tx_a;
+ } else {
+ siu_stream = &port_info->capture;
+ param = &siu_stream->param;
+ param->shdma_slave.slave_id = port ? pdata->dma_slave_rx_b :
+ pdata->dma_slave_rx_a;
+ }
+
+ /* 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_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_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_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_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_soc_pcm_runtime *rtd)
+{
+ /* card->dev == socdev->dev, see snd_soc_new_pcms() */
+ struct snd_card *card = rtd->card->snd_card;
+ struct snd_pcm *pcm = rtd->pcm;
+ struct siu_info *info = siu_i2s_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);
+
+ 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_driver siu_platform = {
+ .ops = &siu_pcm_ops,
+ .pcm_new = siu_pcm_new,
+ .pcm_free = siu_pcm_free,
+};
+EXPORT_SYMBOL_GPL(siu_platform);
Code Review / kvmfornfv.git / blobdiff