--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+//
+// Socionext UniPhier AIO Compress Audio driver.
+//
+// Copyright (c) 2017-2018 Socionext Inc.
+//
+// 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; version 2
+// of the License.
+//
+// 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, see <http://www.gnu.org/licenses/>.
+
+#include <linux/bitfield.h>
+#include <linux/circ_buf.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+#include "aio.h"
+
+static int uniphier_aio_compr_prepare(struct snd_compr_stream *cstream);
+static int uniphier_aio_compr_hw_free(struct snd_compr_stream *cstream);
+
+static int uniphier_aio_comprdma_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_compr *compr = rtd->compr;
+ struct device *dev = compr->card->dev;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[compr->direction];
+ size_t size = AUD_RING_SIZE;
+ int dma_dir = DMA_FROM_DEVICE, ret;
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33));
+ if (ret)
+ return ret;
+
+ sub->compr_area = kzalloc(size, GFP_KERNEL);
+ if (!sub->compr_area)
+ return -ENOMEM;
+
+ if (sub->swm->dir == PORT_DIR_OUTPUT)
+ dma_dir = DMA_TO_DEVICE;
+
+ sub->compr_addr = dma_map_single(dev, sub->compr_area, size, dma_dir);
+ ret = dma_mapping_error(dev, sub->compr_addr);
+ if (ret) {
+ kfree(sub->compr_area);
+ sub->compr_area = NULL;
+
+ return ret;
+ }
+
+ sub->compr_bytes = size;
+
+ return 0;
+}
+
+static int uniphier_aio_comprdma_free(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_compr *compr = rtd->compr;
+ struct device *dev = compr->card->dev;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[compr->direction];
+ int dma_dir = DMA_FROM_DEVICE;
+
+ if (sub->swm->dir == PORT_DIR_OUTPUT)
+ dma_dir = DMA_TO_DEVICE;
+
+ dma_unmap_single(dev, sub->compr_addr, sub->compr_bytes, dma_dir);
+ kfree(sub->compr_area);
+ sub->compr_area = NULL;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_open(struct snd_compr_stream *cstream)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ int ret;
+
+ if (sub->cstream)
+ return -EBUSY;
+
+ sub->cstream = cstream;
+ sub->pass_through = 1;
+ sub->use_mmap = false;
+
+ ret = uniphier_aio_comprdma_new(rtd);
+ if (ret)
+ return ret;
+
+ ret = aio_init(sub);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_free(struct snd_compr_stream *cstream)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ int ret;
+
+ ret = uniphier_aio_compr_hw_free(cstream);
+ if (ret)
+ return ret;
+ ret = uniphier_aio_comprdma_free(rtd);
+ if (ret)
+ return ret;
+
+ sub->cstream = NULL;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_get_params(struct snd_compr_stream *cstream,
+ struct snd_codec *params)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+
+ *params = sub->cparams.codec;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_set_params(struct snd_compr_stream *cstream,
+ struct snd_compr_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ struct device *dev = &aio->chip->pdev->dev;
+ int ret;
+
+ if (params->codec.id != SND_AUDIOCODEC_IEC61937) {
+ dev_err(dev, "Codec ID is not supported(%d)\n",
+ params->codec.id);
+ return -EINVAL;
+ }
+ if (params->codec.profile != SND_AUDIOPROFILE_IEC61937_SPDIF) {
+ dev_err(dev, "Codec profile is not supported(%d)\n",
+ params->codec.profile);
+ return -EINVAL;
+ }
+
+ /* IEC frame type will be changed after received valid data */
+ sub->iec_pc = IEC61937_PC_AAC;
+
+ sub->cparams = *params;
+ sub->setting = 1;
+
+ aio_port_reset(sub);
+ aio_src_reset(sub);
+
+ ret = uniphier_aio_compr_prepare(cstream);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_hw_free(struct snd_compr_stream *cstream)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+
+ sub->setting = 0;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_prepare(struct snd_compr_stream *cstream)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *runtime = cstream->runtime;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ int bytes = runtime->fragment_size;
+ unsigned long flags;
+ int ret;
+
+ ret = aiodma_ch_set_param(sub);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&sub->lock, flags);
+ ret = aiodma_rb_set_buffer(sub, sub->compr_addr,
+ sub->compr_addr + sub->compr_bytes,
+ bytes);
+ spin_unlock_irqrestore(&sub->lock, flags);
+ if (ret)
+ return ret;
+
+ ret = aio_port_set_param(sub, sub->pass_through, &sub->params);
+ if (ret)
+ return ret;
+ ret = aio_oport_set_stream_type(sub, sub->iec_pc);
+ if (ret)
+ return ret;
+ aio_port_set_enable(sub, 1);
+
+ ret = aio_if_set_param(sub, sub->pass_through);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int uniphier_aio_compr_trigger(struct snd_compr_stream *cstream,
+ int cmd)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *runtime = cstream->runtime;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ struct device *dev = &aio->chip->pdev->dev;
+ int bytes = runtime->fragment_size, ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sub->lock, flags);
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes);
+ aiodma_ch_set_enable(sub, 1);
+ sub->running = 1;
+
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ sub->running = 0;
+ aiodma_ch_set_enable(sub, 0);
+
+ break;
+ default:
+ dev_warn(dev, "Unknown trigger(%d)\n", cmd);
+ ret = -EINVAL;
+ }
+ spin_unlock_irqrestore(&sub->lock, flags);
+
+ return ret;
+}
+
+static int uniphier_aio_compr_pointer(struct snd_compr_stream *cstream,
+ struct snd_compr_tstamp *tstamp)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *runtime = cstream->runtime;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ int bytes = runtime->fragment_size;
+ unsigned long flags;
+ u32 pos;
+
+ spin_lock_irqsave(&sub->lock, flags);
+
+ aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes);
+
+ if (sub->swm->dir == PORT_DIR_OUTPUT) {
+ pos = sub->rd_offs;
+ /* Size of AIO output format is double of IEC61937 */
+ tstamp->copied_total = sub->rd_total / 2;
+ } else {
+ pos = sub->wr_offs;
+ tstamp->copied_total = sub->rd_total;
+ }
+ tstamp->byte_offset = pos;
+
+ spin_unlock_irqrestore(&sub->lock, flags);
+
+ return 0;
+}
+
+static int aio_compr_send_to_hw(struct uniphier_aio_sub *sub,
+ char __user *buf, size_t dstsize)
+{
+ u32 __user *srcbuf = (u32 __user *)buf;
+ u32 *dstbuf = (u32 *)(sub->compr_area + sub->wr_offs);
+ int src = 0, dst = 0, ret;
+ u32 frm, frm_a, frm_b;
+
+ while (dstsize > 0) {
+ ret = get_user(frm, srcbuf + src);
+ if (ret)
+ return ret;
+ src++;
+
+ frm_a = frm & 0xffff;
+ frm_b = (frm >> 16) & 0xffff;
+
+ if (frm == IEC61937_HEADER_SIGN) {
+ frm_a |= 0x01000000;
+
+ /* Next data is Pc and Pd */
+ sub->iec_header = true;
+ } else {
+ u16 pc = be16_to_cpu((__be16)frm_a);
+
+ if (sub->iec_header && sub->iec_pc != pc) {
+ /* Force overwrite IEC frame type */
+ sub->iec_pc = pc;
+ ret = aio_oport_set_stream_type(sub, pc);
+ if (ret)
+ return ret;
+ }
+ sub->iec_header = false;
+ }
+ dstbuf[dst++] = frm_a;
+ dstbuf[dst++] = frm_b;
+
+ dstsize -= sizeof(u32) * 2;
+ }
+
+ return 0;
+}
+
+static int uniphier_aio_compr_copy(struct snd_compr_stream *cstream,
+ char __user *buf, size_t count)
+{
+ struct snd_soc_pcm_runtime *rtd = cstream->private_data;
+ struct snd_compr_runtime *runtime = cstream->runtime;
+ struct device *carddev = rtd->compr->card->dev;
+ struct uniphier_aio *aio = uniphier_priv(rtd->cpu_dai);
+ struct uniphier_aio_sub *sub = &aio->sub[cstream->direction];
+ size_t cnt = min_t(size_t, count, aio_rb_space_to_end(sub) / 2);
+ int bytes = runtime->fragment_size;
+ unsigned long flags;
+ size_t s;
+ int ret;
+
+ if (cnt < sizeof(u32))
+ return 0;
+
+ if (sub->swm->dir == PORT_DIR_OUTPUT) {
+ dma_addr_t dmapos = sub->compr_addr + sub->wr_offs;
+
+ /* Size of AIO output format is double of IEC61937 */
+ s = cnt * 2;
+
+ dma_sync_single_for_cpu(carddev, dmapos, s, DMA_TO_DEVICE);
+ ret = aio_compr_send_to_hw(sub, buf, s);
+ dma_sync_single_for_device(carddev, dmapos, s, DMA_TO_DEVICE);
+ } else {
+ dma_addr_t dmapos = sub->compr_addr + sub->rd_offs;
+
+ s = cnt;
+
+ dma_sync_single_for_cpu(carddev, dmapos, s, DMA_FROM_DEVICE);
+ ret = copy_to_user(buf, sub->compr_area + sub->rd_offs, s);
+ dma_sync_single_for_device(carddev, dmapos, s, DMA_FROM_DEVICE);
+ }
+ if (ret)
+ return -EFAULT;
+
+ spin_lock_irqsave(&sub->lock, flags);
+
+ sub->threshold = 2 * bytes;
+ aiodma_rb_set_threshold(sub, sub->compr_bytes, 2 * bytes);
+
+ if (sub->swm->dir == PORT_DIR_OUTPUT) {
+ sub->wr_offs += s;
+ if (sub->wr_offs >= sub->compr_bytes)
+ sub->wr_offs -= sub->compr_bytes;
+ } else {
+ sub->rd_offs += s;
+ if (sub->rd_offs >= sub->compr_bytes)
+ sub->rd_offs -= sub->compr_bytes;
+ }
+ aiodma_rb_sync(sub, sub->compr_addr, sub->compr_bytes, bytes);
+
+ spin_unlock_irqrestore(&sub->lock, flags);
+
+ return cnt;
+}
+
+static int uniphier_aio_compr_get_caps(struct snd_compr_stream *cstream,
+ struct snd_compr_caps *caps)
+{
+ caps->num_codecs = 1;
+ caps->min_fragment_size = AUD_MIN_FRAGMENT_SIZE;
+ caps->max_fragment_size = AUD_MAX_FRAGMENT_SIZE;
+ caps->min_fragments = AUD_MIN_FRAGMENT;
+ caps->max_fragments = AUD_MAX_FRAGMENT;
+ caps->codecs[0] = SND_AUDIOCODEC_IEC61937;
+
+ return 0;
+}
+
+static const struct snd_compr_codec_caps caps_iec = {
+ .num_descriptors = 1,
+ .descriptor[0].max_ch = 8,
+ .descriptor[0].num_sample_rates = 0,
+ .descriptor[0].num_bitrates = 0,
+ .descriptor[0].profiles = SND_AUDIOPROFILE_IEC61937_SPDIF,
+ .descriptor[0].modes = SND_AUDIOMODE_IEC_AC3 |
+ SND_AUDIOMODE_IEC_MPEG1 |
+ SND_AUDIOMODE_IEC_MP3 |
+ SND_AUDIOMODE_IEC_DTS,
+ .descriptor[0].formats = 0,
+};
+
+static int uniphier_aio_compr_get_codec_caps(struct snd_compr_stream *stream,
+ struct snd_compr_codec_caps *codec)
+{
+ if (codec->codec == SND_AUDIOCODEC_IEC61937)
+ *codec = caps_iec;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+const struct snd_compr_ops uniphier_aio_compr_ops = {
+ .open = uniphier_aio_compr_open,
+ .free = uniphier_aio_compr_free,
+ .get_params = uniphier_aio_compr_get_params,
+ .set_params = uniphier_aio_compr_set_params,
+ .trigger = uniphier_aio_compr_trigger,
+ .pointer = uniphier_aio_compr_pointer,
+ .copy = uniphier_aio_compr_copy,
+ .get_caps = uniphier_aio_compr_get_caps,
+ .get_codec_caps = uniphier_aio_compr_get_codec_caps,
+};
projects / platform / kernel / linux-rpi.git / commitdiff