[ALSA] ASoC: Add drivers for the Texas Instruments OMAP processors

Add common OMAP ASoC drivers and machine driver for Nokia N810. Currently
supported features are:

- Covers OMAPs from 1510 to 2420
- Common DMA driver
- DAI link driver using McBSP port in I2S mode
- Basic machine driver for Nokia N810

Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 357 insertions, 0 deletions

diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
new file mode 100644
index 000000000000..62370202c649
--- /dev/null
+++ b/sound/soc/omap/omap-pcm.c
@@ -0,0 +1,357 @@
+/*
+ * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
+ *
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/dma-mapping.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/arch/dma.h>
+#include "omap-pcm.h"
+
+static const struct snd_pcm_hardware omap_pcm_hardware = {
+        .info                   = SNDRV_PCM_INFO_MMAP |
+                                  SNDRV_PCM_INFO_MMAP_VALID |
+                                  SNDRV_PCM_INFO_INTERLEAVED |
+                                  SNDRV_PCM_INFO_PAUSE |
+                                  SNDRV_PCM_INFO_RESUME,
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .period_bytes_min       = 32,
+        .period_bytes_max       = 64 * 1024,
+        .periods_min            = 2,
+        .periods_max            = 255,
+        .buffer_bytes_max       = 128 * 1024,
+};
+
+struct omap_runtime_data {
+        spinlock_t                      lock;
+        struct omap_pcm_dma_data        *dma_data;
+        int                             dma_ch;
+        int                             period_index;
+};
+
+static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
+{
+        struct snd_pcm_substream *substream = data;
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd = runtime->private_data;
+        unsigned long flags;
+
+        if (cpu_is_omap1510()) {
+                /*
+                 * OMAP1510 doesn't support DMA chaining so have to restart
+                 * the transfer after all periods are transferred
+                 */
+                spin_lock_irqsave(&prtd->lock, flags);
+                if (prtd->period_index >= 0) {
+                        if (++prtd->period_index == runtime->periods) {
+                                prtd->period_index = 0;
+                                omap_start_dma(prtd->dma_ch);
+                        }
+                }
+                spin_unlock_irqrestore(&prtd->lock, flags);
+        }
+
+        snd_pcm_period_elapsed(substream);
+}
+
+/* this may get called several times by oss emulation */
+static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
+                              struct snd_pcm_hw_params *params)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct omap_runtime_data *prtd = runtime->private_data;
+        struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
+        int err = 0;
+
+        if (!dma_data)
+                return -ENODEV;
+
+        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+        runtime->dma_bytes = params_buffer_bytes(params);
+
+        if (prtd->dma_data)
+                return 0;
+        prtd->dma_data = dma_data;
+        err = omap_request_dma(dma_data->dma_req, dma_data->name,
+                               omap_pcm_dma_irq, substream, &prtd->dma_ch);
+        if (!cpu_is_omap1510()) {
+                /*
+                 * Link channel with itself so DMA doesn't need any
+                 * reprogramming while looping the buffer
+                 */
+                omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
+        }
+
+        return err;
+}
+
+static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd = runtime->private_data;
+
+        if (prtd->dma_data == NULL)
+                return 0;
+
+        if (!cpu_is_omap1510())
+                omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
+        omap_free_dma(prtd->dma_ch);
+        prtd->dma_data = NULL;
+
+        snd_pcm_set_runtime_buffer(substream, NULL);
+
+        return 0;
+}
+
+static int omap_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd = runtime->private_data;
+        struct omap_pcm_dma_data *dma_data = prtd->dma_data;
+        struct omap_dma_channel_params dma_params;
+
+        memset(&dma_params, 0, sizeof(dma_params));
+        /*
+         * Note: Regardless of interface data formats supported by OMAP McBSP
+         * or EAC blocks, internal representation is always fixed 16-bit/sample
+         */
+        dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
+        dma_params.trigger                      = dma_data->dma_req;
+        dma_params.sync_mode                    = OMAP_DMA_SYNC_ELEMENT;
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
+                dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
+                dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
+                dma_params.src_start            = runtime->dma_addr;
+                dma_params.dst_start            = dma_data->port_addr;
+        } else {
+                dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
+                dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
+                dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
+                dma_params.src_start            = dma_data->port_addr;
+                dma_params.dst_start            = runtime->dma_addr;
+        }
+        /*
+         * Set DMA transfer frame size equal to ALSA period size and frame
+         * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
+         * we can transfer the whole ALSA buffer with single DMA transfer but
+         * still can get an interrupt at each period bounary
+         */
+        dma_params.elem_count   = snd_pcm_lib_period_bytes(substream) / 2;
+        dma_params.frame_count  = runtime->periods;
+        omap_set_dma_params(prtd->dma_ch, &dma_params);
+
+        omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
+
+        return 0;
+}
+
+static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd = runtime->private_data;
+        int ret = 0;
+
+        spin_lock_irq(&prtd->lock);
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                prtd->period_index = 0;
+                omap_start_dma(prtd->dma_ch);
+                break;
+
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                prtd->period_index = -1;
+                omap_stop_dma(prtd->dma_ch);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+        spin_unlock_irq(&prtd->lock);
+
+        return ret;
+}
+
+static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd = runtime->private_data;
+        dma_addr_t ptr;
+        snd_pcm_uframes_t offset;
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                ptr = omap_get_dma_src_pos(prtd->dma_ch);
+        else
+                ptr = omap_get_dma_dst_pos(prtd->dma_ch);
+
+        offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
+        if (offset >= runtime->buffer_size)
+                offset = 0;
+
+        return offset;
+}
+
+static int omap_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct omap_runtime_data *prtd;
+        int ret;
+
+        snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
+
+        /* Ensure that buffer size is a multiple of period size */
+        ret = snd_pcm_hw_constraint_integer(runtime,
+                                            SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                goto out;
+
+        prtd = kzalloc(sizeof(prtd), GFP_KERNEL);
+        if (prtd == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
+        spin_lock_init(&prtd->lock);
+        runtime->private_data = prtd;
+
+out:
+        return ret;
+}
+
+static int omap_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+
+        kfree(runtime->private_data);
+        return 0;
+}
+
+static int omap_pcm_mmap(struct snd_pcm_substream *substream,
+        struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+
+        return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+                                     runtime->dma_area,
+                                     runtime->dma_addr,
+                                     runtime->dma_bytes);
+}
+
+struct snd_pcm_ops omap_pcm_ops = {
+        .open           = omap_pcm_open,
+        .close          = omap_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = omap_pcm_hw_params,
+        .hw_free        = omap_pcm_hw_free,
+        .prepare        = omap_pcm_prepare,
+        .trigger        = omap_pcm_trigger,
+        .pointer        = omap_pcm_pointer,
+        .mmap           = omap_pcm_mmap,
+};
+
+static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
+
+static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
+        int stream)
+{
+        struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+        struct snd_dma_buffer *buf = &substream->dma_buffer;
+        size_t size = omap_pcm_hardware.buffer_bytes_max;
+
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = pcm->card->dev;
+        buf->private_data = NULL;
+        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+                                           &buf->addr, GFP_KERNEL);
+        if (!buf->area)
+                return -ENOMEM;
+
+        buf->bytes = size;
+        return 0;
+}
+
+static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+
+        for (stream = 0; stream < 2; stream++) {
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+
+                dma_free_writecombine(pcm->card->dev, buf->bytes,
+                                      buf->area, buf->addr);
+                buf->area = NULL;
+        }
+}
+
+int omap_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
+                 struct snd_pcm *pcm)
+{
+        int ret = 0;
+
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &omap_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_32BIT_MASK;
+
+        if (dai->playback.channels_min) {
+                ret = omap_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                if (ret)
+                        goto out;
+        }
+
+        if (dai->capture.channels_min) {
+                ret = omap_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                if (ret)
+                        goto out;
+        }
+
+out:
+        return ret;
+}
+
+struct snd_soc_platform omap_soc_platform = {
+        .name           = "omap-pcm-audio",
+        .pcm_ops        = &omap_pcm_ops,
+        .pcm_new        = omap_pcm_new,
+        .pcm_free       = omap_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(omap_soc_platform);
+
+MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
+MODULE_DESCRIPTION("OMAP PCM DMA module");
+MODULE_LICENSE("GPL");