diff options
Diffstat (limited to 'kernel/sound/soc/ux500/ux500_pcm.c')
| -rw-r--r-- | kernel/sound/soc/ux500/ux500_pcm.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/kernel/sound/soc/ux500/ux500_pcm.c b/kernel/sound/soc/ux500/ux500_pcm.c new file mode 100644 index 000000000..51a66a873 --- /dev/null +++ b/kernel/sound/soc/ux500/ux500_pcm.c @@ -0,0 +1,168 @@ +/* + * Copyright (C) ST-Ericsson SA 2012 + * + * Author: Ola Lilja <ola.o.lilja@stericsson.com>, + * Roger Nilsson <roger.xr.nilsson@stericsson.com> + * for ST-Ericsson. + * + * License terms: + * + * 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. + */ + +#include <asm/page.h> + +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/slab.h> +#include <linux/platform_data/dma-ste-dma40.h> + +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/dmaengine_pcm.h> + +#include "ux500_msp_i2s.h" +#include "ux500_pcm.h" + +#define UX500_PLATFORM_PERIODS_BYTES_MIN 128 +#define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE) +#define UX500_PLATFORM_PERIODS_MIN 2 +#define UX500_PLATFORM_PERIODS_MAX 48 +#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE) + +static const struct snd_pcm_hardware ux500_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_RESUME | + SNDRV_PCM_INFO_PAUSE, + .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX, + .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN, + .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX, + .periods_min = UX500_PLATFORM_PERIODS_MIN, + .periods_max = UX500_PLATFORM_PERIODS_MAX, +}; + +static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd, + struct snd_pcm_substream *substream) +{ + struct snd_soc_dai *dai = rtd->cpu_dai; + u16 per_data_width, mem_data_width; + struct stedma40_chan_cfg *dma_cfg; + struct ux500_msp_dma_params *dma_params; + + dma_params = snd_soc_dai_get_dma_data(dai, substream); + dma_cfg = dma_params->dma_cfg; + + mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + + switch (dma_params->data_size) { + case 32: + per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + break; + case 16: + per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + break; + case 8: + per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE; + break; + default: + per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + } + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + dma_cfg->src_info.data_width = mem_data_width; + dma_cfg->dst_info.data_width = per_data_width; + } else { + dma_cfg->src_info.data_width = per_data_width; + dma_cfg->dst_info.data_width = mem_data_width; + } + + return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg); +} + +static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct dma_slave_config *slave_config) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data; + struct snd_dmaengine_dai_dma_data *snd_dma_params; + struct ux500_msp_dma_params *ste_dma_params; + dma_addr_t dma_addr; + int ret; + + if (pdata) { + ste_dma_params = + snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + dma_addr = ste_dma_params->tx_rx_addr; + } else { + snd_dma_params = + snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); + dma_addr = snd_dma_params->addr; + } + + ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); + if (ret) + return ret; + + slave_config->dst_maxburst = 4; + slave_config->src_maxburst = 4; + + slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + slave_config->dst_addr = dma_addr; + else + slave_config->src_addr = dma_addr; + + return 0; +} + +static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = { + .pcm_hardware = &ux500_pcm_hw, + .compat_request_channel = ux500_pcm_request_chan, + .prealloc_buffer_size = 128 * 1024, + .prepare_slave_config = ux500_pcm_prepare_slave_config, +}; + +static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = { + .compat_request_channel = ux500_pcm_request_chan, + .prepare_slave_config = ux500_pcm_prepare_slave_config, +}; + +int ux500_pcm_register_platform(struct platform_device *pdev) +{ + const struct snd_dmaengine_pcm_config *pcm_config; + struct device_node *np = pdev->dev.of_node; + int ret; + + if (np) + pcm_config = &ux500_dmaengine_of_pcm_config; + else + pcm_config = &ux500_dmaengine_pcm_config; + + ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config, + SND_DMAENGINE_PCM_FLAG_NO_RESIDUE | + SND_DMAENGINE_PCM_FLAG_COMPAT); + if (ret < 0) { + dev_err(&pdev->dev, + "%s: ERROR: Failed to register platform '%s' (%d)!\n", + __func__, pdev->name, ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(ux500_pcm_register_platform); + +int ux500_pcm_unregister_platform(struct platform_device *pdev) +{ + snd_dmaengine_pcm_unregister(&pdev->dev); + return 0; +} +EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform); |