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Subject[PATCH 4/9] ASoC: Blackfin: DMA Driver for AC97 sound chip
Date
From: Cliff Cai <cliff.cai@analog.com>

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Cliff Cai <cliff.cai@analog.com>
---
sound/soc/blackfin/bf5xx-ac97-pcm.c | 430 +++++++++++++++++++++++++++++++++++
sound/soc/blackfin/bf5xx-ac97-pcm.h | 29 +++
2 files changed, 459 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/blackfin/bf5xx-ac97-pcm.c
create mode 100644 sound/soc/blackfin/bf5xx-ac97-pcm.h
diff --git a/sound/soc/blackfin/bf5xx-ac97-pcm.c b/sound/soc/blackfin/bf5xx-ac97-pcm.c
new file mode 100644
index 0000000..1975324
--- /dev/null
+++ b/sound/soc/blackfin/bf5xx-ac97-pcm.c
@@ -0,0 +1,430 @@
+/*
+ * File: sound/soc/blackfin/bf5xx-ac97-pcm.c
+ * Author: Cliff Cai <Cliff.Cai@analog.com>
+ *
+ * Created: Tue June 06 2008
+ * Description: DMA Driver for AC97 sound chip
+ *
+ * Modified:
+ * Copyright 2008 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+
+#include "bf5xx-ac97-pcm.h"
+#include "bf5xx-ac97.h"
+#include "bf5xx-sport.h"
+
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t count)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sport_device *sport = runtime->private_data;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ bf5xx_pcm_to_ac97(
+ (struct ac97_frame *)sport->tx_dma_buf + sport->tx_pos,
+ (__u32 *)runtime->dma_area + sport->tx_pos, count);
+ sport->tx_pos += runtime->period_size;
+ if (sport->tx_pos >= runtime->buffer_size)
+ sport->tx_pos %= runtime->buffer_size;
+ } else {
+ bf5xx_ac97_to_pcm(
+ (struct ac97_frame *)sport->rx_dma_buf + sport->rx_pos,
+ (__u32 *)runtime->dma_area + sport->rx_pos, count);
+ sport->rx_pos += runtime->period_size;
+ if (sport->rx_pos >= runtime->buffer_size)
+ sport->rx_pos %= runtime->buffer_size;
+ }
+}
+#endif
+
+static void bf5xx_dma_irq(void *data)
+{
+ struct snd_pcm_substream *pcm = data;
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ bf5xx_mmap_copy(pcm, runtime->period_size);
+#endif
+ snd_pcm_period_elapsed(pcm);
+}
+
+/* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
+ * The total rx/tx buffer is for ac97 frame to hold all pcm data
+ * is 0x20000 * sizeof(struct ac97_frame) / 4.
+ */
+#ifdef CONFIG_SND_MMAP_SUPPORT
+static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+#else
+static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+#endif
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .period_bytes_min = 32,
+ .period_bytes_max = 0x10000,
+ .periods_min = 1,
+ .periods_max = PAGE_SIZE/32,
+ .buffer_bytes_max = 0x20000, /* 128 kbytes */
+ .fifo_size = 16,
+};
+
+static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ size_t size = bf5xx_pcm_hardware.buffer_bytes_max
+ * sizeof(struct ac97_frame) / 4;
+
+ snd_pcm_lib_malloc_pages(substream, size);
+
+ return 0;
+}
+
+static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_lib_free_pages(substream);
+ return 0;
+}
+
+static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sport_device *sport = runtime->private_data;
+
+ /* An intermediate buffer is introduced for implementing mmap for
+ * SPORT working in TMD mode(include AC97).
+ */
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ size_t size = bf5xx_pcm_hardware.buffer_bytes_max
+ * sizeof(struct ac97_frame) / 4;
+ /*clean up intermediate buffer*/
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ memset(sport->tx_dma_buf, 0, size);
+ sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
+ sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
+ runtime->period_size * sizeof(struct ac97_frame));
+ } else {
+ memset(sport->rx_dma_buf, 0, size);
+ sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
+ sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
+ runtime->period_size * sizeof(struct ac97_frame));
+ }
+#else
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
+ sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
+ runtime->period_size * sizeof(struct ac97_frame));
+ } else {
+ sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
+ sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
+ runtime->period_size * sizeof(struct ac97_frame));
+ }
+#endif
+ return 0;
+}
+
+static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sport_device *sport = runtime->private_data;
+ int ret = 0;
+
+ pr_debug("%s enter\n", __func__);
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sport_tx_start(sport);
+ else
+ sport_rx_start(sport);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ sport->tx_pos = 0;
+#endif
+ sport_tx_stop(sport);
+ } else {
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ sport->rx_pos = 0;
+#endif
+ sport_rx_stop(sport);
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ return ret;
+}
+
+static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct sport_device *sport = runtime->private_data;
+ unsigned int curr;
+
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ curr = sport->tx_pos;
+ else
+ curr = sport->rx_pos;
+#else
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
+ else {
+ curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
+
+ }
+#endif
+ return curr;
+}
+
+static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int ret;
+
+ pr_debug("%s enter\n", __func__);
+ snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
+
+ ret = snd_pcm_hw_constraint_integer(runtime, \
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ goto out;
+
+ if (sport_handle != NULL)
+ runtime->private_data = sport_handle;
+ else {
+ pr_err("sport_handle is NULL\n");
+ return -1;
+ }
+ return 0;
+
+ out:
+ return ret;
+}
+
+#ifdef CONFIG_SND_MMAP_SUPPORT
+static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ size_t size = vma->vm_end - vma->vm_start;
+ vma->vm_start = (unsigned long)runtime->dma_area;
+ vma->vm_end = vma->vm_start + size;
+ vma->vm_flags |= VM_SHARED;
+ return 0 ;
+}
+#else
+static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
+ snd_pcm_uframes_t pos,
+ void __user *buf, snd_pcm_uframes_t count)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ pr_debug("%s copy pos:0x%lx count:0x%lx\n",
+ substream->stream?"Capture":"Playback", pos, count);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ bf5xx_pcm_to_ac97(
+ (struct ac97_frame *)runtime->dma_area + pos,
+ buf, count);
+ else
+ bf5xx_ac97_to_pcm(
+ (struct ac97_frame *)runtime->dma_area + pos,
+ buf, count);
+ return 0;
+}
+#endif
+
+struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
+ .open = bf5xx_pcm_open,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = bf5xx_pcm_hw_params,
+ .hw_free = bf5xx_pcm_hw_free,
+ .prepare = bf5xx_pcm_prepare,
+ .trigger = bf5xx_pcm_trigger,
+ .pointer = bf5xx_pcm_pointer,
+#ifdef CONFIG_SND_MMAP_SUPPORT
+ .mmap = bf5xx_pcm_mmap,
+#else
+ .copy = bf5xx_pcm_copy,
+#endif
+};
+
+static int bf5xx_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 = bf5xx_pcm_hardware.buffer_bytes_max
+ * sizeof(struct ac97_frame) / 4;
+
+ buf->dev.type = SNDRV_DMA_TYPE_DEV;
+ buf->dev.dev = pcm->card->dev;
+ buf->private_data = NULL;
+ buf->area = dma_alloc_coherent(pcm->card->dev, size,
+ &buf->addr, GFP_KERNEL);
+ if (!buf->area) {
+ pr_err("Failed to allocate dma memory\n");
+ pr_err("Please increase uncached DMA memory region\n");
+ return -ENOMEM;
+ }
+ buf->bytes = size;
+
+ pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
+ buf->area, buf->bytes);
+
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sport_handle->tx_buf = buf->area;
+ else
+ sport_handle->rx_buf = buf->area;
+
+/*
+ * Need to allocate local buffer when enable
+ * MMAP for SPORT working in TMD mode (include AC97).
+ */
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (!sport_handle->tx_dma_buf) {
+ sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
+ size, &sport_handle->tx_dma_phy, GFP_KERNEL);
+ if (!sport_handle->tx_dma_buf) {
+ pr_err("Failed to allocate memory for tx dma \
+ buf - Please increase uncached DMA \
+ memory region\n");
+ return -ENOMEM;
+ } else
+ memset(sport_handle->tx_dma_buf, 0, size);
+ } else
+ memset(sport_handle->tx_dma_buf, 0, size);
+ } else {
+ if (!sport_handle->rx_dma_buf) {
+ sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
+ size, &sport_handle->rx_dma_phy, GFP_KERNEL);
+ if (!sport_handle->rx_dma_buf) {
+ pr_err("Failed to allocate memory for rx dma \
+ buf - Please increase uncached DMA \
+ memory region\n");
+ return -ENOMEM;
+ } else
+ memset(sport_handle->rx_dma_buf, 0, size);
+ } else
+ memset(sport_handle->rx_dma_buf, 0, size);
+ }
+#endif
+ return 0;
+}
+
+static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *buf;
+ int stream;
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
+ sizeof(struct ac97_frame) / 4;
+#endif
+ for (stream = 0; stream < 2; stream++) {
+ substream = pcm->streams[stream].substream;
+ if (!substream)
+ continue;
+
+ buf = &substream->dma_buffer;
+ if (!buf->area)
+ continue;
+ dma_free_coherent(NULL, buf->bytes, buf->area, 0);
+ buf->area = NULL;
+#if defined(CONFIG_SND_MMAP_SUPPORT)
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (sport_handle->tx_dma_buf)
+ dma_free_coherent(NULL, size, \
+ sport_handle->tx_dma_buf, 0);
+ sport_handle->tx_dma_buf = NULL;
+ } else {
+
+ if (sport_handle->rx_dma_buf)
+ dma_free_coherent(NULL, size, \
+ sport_handle->rx_dma_buf, 0);
+ sport_handle->rx_dma_buf = NULL;
+ }
+#endif
+ }
+ if (sport_handle)
+ sport_done(sport_handle);
+}
+
+static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
+
+int bf5xx_pcm_ac97_new(struct snd_card *card, struct snd_soc_dai *dai,
+ struct snd_pcm *pcm)
+{
+ int ret = 0;
+
+ pr_debug("%s enter\n", __func__);
+ if (!card->dev->dma_mask)
+ card->dev->dma_mask = &bf5xx_pcm_dmamask;
+ if (!card->dev->coherent_dma_mask)
+ card->dev->coherent_dma_mask = DMA_32BIT_MASK;
+
+ if (dai->playback.channels_min) {
+ ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_PLAYBACK);
+ if (ret)
+ goto out;
+ }
+
+ if (dai->capture.channels_min) {
+ ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
+ SNDRV_PCM_STREAM_CAPTURE);
+ if (ret)
+ goto out;
+ }
+ out:
+ return ret;
+}
+
+struct snd_soc_platform bf5xx_ac97_soc_platform = {
+ .name = "bf5xx-audio",
+ .pcm_ops = &bf5xx_pcm_ac97_ops,
+ .pcm_new = bf5xx_pcm_ac97_new,
+ .pcm_free = bf5xx_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(bf5xx_ac97_soc_platform);
+
+MODULE_AUTHOR("Cliff Cai");
+MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/blackfin/bf5xx-ac97-pcm.h b/sound/soc/blackfin/bf5xx-ac97-pcm.h
new file mode 100644
index 0000000..350125a
--- /dev/null
+++ b/sound/soc/blackfin/bf5xx-ac97-pcm.h
@@ -0,0 +1,29 @@
+/*
+ * linux/sound/arm/bf5xx-ac97-pcm.h -- ALSA PCM interface for the Blackfin
+ *
+ * Copyright 2007 Analog Device Inc.
+ *
+ * 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.
+ */
+
+#ifndef _BF5XX_AC97_PCM_H
+#define _BF5XX_AC97_PCM_H
+
+struct bf5xx_pcm_dma_params {
+ char *name; /* stream identifier */
+};
+
+struct bf5xx_gpio {
+ u32 sys;
+ u32 rx;
+ u32 tx;
+ u32 clk;
+ u32 frm;
+};
+
+/* platform data */
+extern struct snd_soc_platform bf5xx_ac97_soc_platform;
+
+#endif
--
1.5.6

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