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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) ST-Ericsson SA 20124 *5 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,6 * Roger Nilsson <roger.xr.nilsson@stericsson.com>7 * for ST-Ericsson.8 */9 10#include <asm/page.h>11 12#include <linux/module.h>13#include <linux/dma-mapping.h>14#include <linux/dmaengine.h>15#include <linux/slab.h>16 17#include <sound/pcm.h>18#include <sound/pcm_params.h>19#include <sound/soc.h>20#include <sound/dmaengine_pcm.h>21 22#include "ux500_msp_i2s.h"23#include "ux500_pcm.h"24 25#define UX500_PLATFORM_PERIODS_BYTES_MIN 12826#define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE)27#define UX500_PLATFORM_PERIODS_MIN 228#define UX500_PLATFORM_PERIODS_MAX 4829#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)30 31static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,32 struct snd_pcm_hw_params *params,33 struct dma_slave_config *slave_config)34{35 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);36 struct snd_dmaengine_dai_dma_data *snd_dma_params;37 dma_addr_t dma_addr;38 int ret;39 40 snd_dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);41 dma_addr = snd_dma_params->addr;42 43 ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);44 if (ret)45 return ret;46 47 slave_config->dst_maxburst = 4;48 slave_config->src_maxburst = 4;49 50 slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;51 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;52 53 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)54 slave_config->dst_addr = dma_addr;55 else56 slave_config->src_addr = dma_addr;57 58 return 0;59}60 61static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {62 .prepare_slave_config = ux500_pcm_prepare_slave_config,63};64 65int ux500_pcm_register_platform(struct platform_device *pdev)66{67 int ret;68 69 ret = snd_dmaengine_pcm_register(&pdev->dev,70 &ux500_dmaengine_of_pcm_config, 0);71 if (ret < 0) {72 dev_err(&pdev->dev,73 "%s: ERROR: Failed to register platform '%s' (%d)!\n",74 __func__, pdev->name, ret);75 return ret;76 }77 78 return 0;79}80EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);81 82int ux500_pcm_unregister_platform(struct platform_device *pdev)83{84 snd_dmaengine_pcm_unregister(&pdev->dev);85 return 0;86}87EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);88 89MODULE_AUTHOR("Ola Lilja");90MODULE_AUTHOR("Roger Nilsson");91MODULE_DESCRIPTION("ASoC UX500 driver");92MODULE_LICENSE("GPL v2");93