diff options
Diffstat (limited to 'sound/soc/blackfin/bf5xx-ac97-pcm.c')
| -rw-r--r-- | sound/soc/blackfin/bf5xx-ac97-pcm.c | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/sound/soc/blackfin/bf5xx-ac97-pcm.c b/sound/soc/blackfin/bf5xx-ac97-pcm.c new file mode 100644 index 00000000000..51f4907c483 --- /dev/null +++ b/sound/soc/blackfin/bf5xx-ac97-pcm.c @@ -0,0 +1,429 @@ +/* + * 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"); |