1 /* 2 * mtk-afe-platform-driver.c -- Mediatek afe platform driver 3 * 4 * Copyright (c) 2016 MediaTek Inc. 5 * Author: Garlic Tseng <garlic.tseng@mediatek.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 and 9 * only version 2 as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/dma-mapping.h> 19 #include <sound/soc.h> 20 21 #include "mtk-afe-platform-driver.h" 22 #include "mtk-base-afe.h" 23 24 static snd_pcm_uframes_t mtk_afe_pcm_pointer 25 (struct snd_pcm_substream *substream) 26 { 27 struct snd_soc_pcm_runtime *rtd = substream->private_data; 28 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, AFE_PCM_NAME); 29 struct mtk_base_afe *afe = snd_soc_component_get_drvdata(component); 30 struct mtk_base_afe_memif *memif = &afe->memif[rtd->cpu_dai->id]; 31 const struct mtk_base_memif_data *memif_data = memif->data; 32 struct regmap *regmap = afe->regmap; 33 struct device *dev = afe->dev; 34 int reg_ofs_base = memif_data->reg_ofs_base; 35 int reg_ofs_cur = memif_data->reg_ofs_cur; 36 unsigned int hw_ptr = 0, hw_base = 0; 37 int ret, pcm_ptr_bytes; 38 39 ret = regmap_read(regmap, reg_ofs_cur, &hw_ptr); 40 if (ret || hw_ptr == 0) { 41 dev_err(dev, "%s hw_ptr err\n", __func__); 42 pcm_ptr_bytes = 0; 43 goto POINTER_RETURN_FRAMES; 44 } 45 46 ret = regmap_read(regmap, reg_ofs_base, &hw_base); 47 if (ret || hw_base == 0) { 48 dev_err(dev, "%s hw_ptr err\n", __func__); 49 pcm_ptr_bytes = 0; 50 goto POINTER_RETURN_FRAMES; 51 } 52 53 pcm_ptr_bytes = hw_ptr - hw_base; 54 55 POINTER_RETURN_FRAMES: 56 return bytes_to_frames(substream->runtime, pcm_ptr_bytes); 57 } 58 59 static const struct snd_pcm_ops mtk_afe_pcm_ops = { 60 .ioctl = snd_pcm_lib_ioctl, 61 .pointer = mtk_afe_pcm_pointer, 62 }; 63 64 static int mtk_afe_pcm_new(struct snd_soc_pcm_runtime *rtd) 65 { 66 size_t size; 67 struct snd_card *card = rtd->card->snd_card; 68 struct snd_pcm *pcm = rtd->pcm; 69 struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, AFE_PCM_NAME); 70 struct mtk_base_afe *afe = snd_soc_component_get_drvdata(component); 71 72 size = afe->mtk_afe_hardware->buffer_bytes_max; 73 return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 74 card->dev, size, size); 75 } 76 77 static void mtk_afe_pcm_free(struct snd_pcm *pcm) 78 { 79 snd_pcm_lib_preallocate_free_for_all(pcm); 80 } 81 82 const struct snd_soc_component_driver mtk_afe_pcm_platform = { 83 .name = AFE_PCM_NAME, 84 .ops = &mtk_afe_pcm_ops, 85 .pcm_new = mtk_afe_pcm_new, 86 .pcm_free = mtk_afe_pcm_free, 87 }; 88 EXPORT_SYMBOL_GPL(mtk_afe_pcm_platform); 89 90 MODULE_DESCRIPTION("Mediatek simple platform driver"); 91 MODULE_AUTHOR("Garlic Tseng <garlic.tseng@mediatek.com>"); 92 MODULE_LICENSE("GPL v2"); 93 94