/* * 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_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);