| /* |
| * 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/dma-mapping.h> |
| #include <linux/gfp.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" |
| |
| static unsigned int ac97_chan_mask[] = { |
| SP_FL, /* Mono */ |
| SP_STEREO, /* Stereo */ |
| SP_2DOT1, /* 2.1*/ |
| SP_QUAD,/*Quadraquic*/ |
| SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */ |
| SP_5DOT1, /* 5.1 */ |
| }; |
| |
| #if defined(CONFIG_SND_BF5XX_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; |
| unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1]; |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf + |
| sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos * |
| runtime->channels, count, chan_mask); |
| sport->tx_pos += runtime->period_size; |
| if (sport->tx_pos >= runtime->buffer_size) |
| sport->tx_pos %= runtime->buffer_size; |
| sport->tx_delay_pos = sport->tx_pos; |
| } else { |
| bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf + |
| sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos * |
| runtime->channels, 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_BF5XX_MMAP_SUPPORT) |
| struct snd_pcm_runtime *runtime = pcm->runtime; |
| struct sport_device *sport = runtime->private_data; |
| bf5xx_mmap_copy(pcm, runtime->period_size); |
| if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| if (sport->once == 0) { |
| snd_pcm_period_elapsed(pcm); |
| bf5xx_mmap_copy(pcm, runtime->period_size); |
| sport->once = 1; |
| } |
| } |
| #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. |
| */ |
| static const struct snd_pcm_hardware bf5xx_pcm_hardware = { |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT) |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| #endif |
| SNDRV_PCM_INFO_BLOCK_TRANSFER, |
| |
| .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) |
| { |
| #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT) |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct sport_device *sport = runtime->private_data; |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| sport->once = 0; |
| if (runtime->dma_area) |
| memset(runtime->dma_area, 0, runtime->buffer_size); |
| memset(sport->tx_dma_buf, 0, runtime->buffer_size * |
| sizeof(struct ac97_frame)); |
| } else |
| memset(sport->rx_dma_buf, 0, runtime->buffer_size * |
| sizeof(struct ac97_frame)); |
| #endif |
| 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_BF5XX_MMAP_SUPPORT) |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| 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 { |
| 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) { |
| #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT) |
| bf5xx_mmap_copy(substream, runtime->period_size); |
| sport->tx_delay_pos = 0; |
| #endif |
| 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_BF5XX_MMAP_SUPPORT) |
| sport->tx_pos = 0; |
| #endif |
| sport_tx_stop(sport); |
| } else { |
| #if defined(CONFIG_SND_BF5XX_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_BF5XX_MMAP_SUPPORT) |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| curr = sport->tx_delay_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_soc_pcm_runtime *rtd = substream->private_data; |
| struct snd_soc_dai *cpu_dai = rtd->cpu_dai; |
| struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai); |
| 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; |
| } |
| |
| #if defined(CONFIG_SND_BF5XX_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; |
| unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1]; |
| 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, |
| (__u16 *)buf, count, chan_mask); |
| else |
| bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos, |
| (__u16 *)buf, count); |
| return 0; |
| } |
| #endif |
| |
| static 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, |
| #if defined(CONFIG_SND_BF5XX_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_soc_pcm_runtime *rtd = pcm->private_data; |
| struct snd_soc_dai *cpu_dai = rtd->cpu_dai; |
| struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai); |
| 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_BF5XX_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_BF5XX_MMAP_SUPPORT) |
| struct snd_soc_pcm_runtime *rtd = pcm->private_data; |
| struct snd_soc_dai *cpu_dai = rtd->cpu_dai; |
| struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai); |
| 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_BF5XX_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 |
| } |
| } |
| |
| static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32); |
| |
| static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_soc_dai *dai = rtd->cpu_dai; |
| struct snd_pcm *pcm = rtd->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_BIT_MASK(32); |
| |
| if (dai->driver->playback.channels_min) { |
| ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (dai->driver->capture.channels_min) { |
| ret = bf5xx_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| out: |
| return ret; |
| } |
| |
| static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = { |
| .ops = &bf5xx_pcm_ac97_ops, |
| .pcm_new = bf5xx_pcm_ac97_new, |
| .pcm_free = bf5xx_pcm_free_dma_buffers, |
| }; |
| |
| static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev) |
| { |
| return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform); |
| } |
| |
| static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_platform(&pdev->dev); |
| return 0; |
| } |
| |
| static struct platform_driver bf5xx_pcm_driver = { |
| .driver = { |
| .name = "bfin-ac97-pcm-audio", |
| .owner = THIS_MODULE, |
| }, |
| |
| .probe = bf5xx_soc_platform_probe, |
| .remove = __devexit_p(bf5xx_soc_platform_remove), |
| }; |
| |
| module_platform_driver(bf5xx_pcm_driver); |
| |
| MODULE_AUTHOR("Cliff Cai"); |
| MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module"); |
| MODULE_LICENSE("GPL"); |