1 files changed, 616 insertions, 0 deletions

diff --git a/sound/soc/sh/siu_pcm.c b/sound/soc/sh/siu_pcm.c
new file mode 100644
index 000000000000..c5efc30f0136
--- /dev/null
+++ b/sound/soc/sh/siu_pcm.c
@@ -0,0 +1,616 @@
+/*
+ * 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 <linux/slab.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/dma-sh.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);