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283b6124 GT |
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 mtk_base_afe *afe = snd_soc_platform_get_drvdata(rtd->platform); | |
29 | struct mtk_base_afe_memif *memif = &afe->memif[rtd->cpu_dai->id]; | |
30 | const struct mtk_base_memif_data *memif_data = memif->data; | |
31 | struct regmap *regmap = afe->regmap; | |
32 | struct device *dev = afe->dev; | |
33 | int reg_ofs_base = memif_data->reg_ofs_base; | |
34 | int reg_ofs_cur = memif_data->reg_ofs_cur; | |
35 | unsigned int hw_ptr = 0, hw_base = 0; | |
36 | int ret, pcm_ptr_bytes; | |
37 | ||
38 | ret = regmap_read(regmap, reg_ofs_cur, &hw_ptr); | |
39 | if (ret || hw_ptr == 0) { | |
40 | dev_err(dev, "%s hw_ptr err\n", __func__); | |
41 | pcm_ptr_bytes = 0; | |
42 | goto POINTER_RETURN_FRAMES; | |
43 | } | |
44 | ||
45 | ret = regmap_read(regmap, reg_ofs_base, &hw_base); | |
46 | if (ret || hw_base == 0) { | |
47 | dev_err(dev, "%s hw_ptr err\n", __func__); | |
48 | pcm_ptr_bytes = 0; | |
49 | goto POINTER_RETURN_FRAMES; | |
50 | } | |
51 | ||
52 | pcm_ptr_bytes = hw_ptr - hw_base; | |
53 | ||
54 | POINTER_RETURN_FRAMES: | |
55 | return bytes_to_frames(substream->runtime, pcm_ptr_bytes); | |
56 | } | |
57 | ||
58 | static const struct snd_pcm_ops mtk_afe_pcm_ops = { | |
59 | .ioctl = snd_pcm_lib_ioctl, | |
60 | .pointer = mtk_afe_pcm_pointer, | |
61 | }; | |
62 | ||
63 | static int mtk_afe_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
64 | { | |
65 | size_t size; | |
66 | struct snd_card *card = rtd->card->snd_card; | |
67 | struct snd_pcm *pcm = rtd->pcm; | |
68 | struct mtk_base_afe *afe = snd_soc_platform_get_drvdata(rtd->platform); | |
69 | ||
70 | size = afe->mtk_afe_hardware->buffer_bytes_max; | |
71 | return snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, | |
72 | card->dev, size, size); | |
73 | } | |
74 | ||
75 | static void mtk_afe_pcm_free(struct snd_pcm *pcm) | |
76 | { | |
77 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
78 | } | |
79 | ||
80 | const struct snd_soc_platform_driver mtk_afe_pcm_platform = { | |
81 | .ops = &mtk_afe_pcm_ops, | |
82 | .pcm_new = mtk_afe_pcm_new, | |
83 | .pcm_free = mtk_afe_pcm_free, | |
84 | }; | |
85 | EXPORT_SYMBOL_GPL(mtk_afe_pcm_platform); | |
86 | ||
87 | MODULE_DESCRIPTION("Mediatek simple platform driver"); | |
88 | MODULE_AUTHOR("Garlic Tseng <garlic.tseng@mediatek.com>"); | |
89 | MODULE_LICENSE("GPL v2"); | |
90 |