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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC. | |
4 | * | |
5 | * Copyright (C) 2012 Atmel | |
6 | * | |
7 | * Author: Bo Shen <voice.shen@atmel.com> | |
8 | * | |
9 | * Based on atmel-pcm by: | |
10 | * Sedji Gaouaou <sedji.gaouaou@atmel.com> | |
11 | * Copyright 2008 Atmel | |
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12 | */ |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/dmaengine.h> | |
20 | #include <linux/atmel-ssc.h> | |
21 | #include <linux/platform_data/dma-atmel.h> | |
22 | ||
23 | #include <sound/core.h> | |
24 | #include <sound/pcm.h> | |
25 | #include <sound/pcm_params.h> | |
26 | #include <sound/soc.h> | |
27 | #include <sound/dmaengine_pcm.h> | |
28 | ||
29 | #include "atmel-pcm.h" | |
30 | ||
31 | /*--------------------------------------------------------------------------*\ | |
32 | * Hardware definition | |
33 | \*--------------------------------------------------------------------------*/ | |
34 | static const struct snd_pcm_hardware atmel_pcm_dma_hardware = { | |
35 | .info = SNDRV_PCM_INFO_MMAP | | |
36 | SNDRV_PCM_INFO_MMAP_VALID | | |
37 | SNDRV_PCM_INFO_INTERLEAVED | | |
38 | SNDRV_PCM_INFO_RESUME | | |
39 | SNDRV_PCM_INFO_PAUSE, | |
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40 | .period_bytes_min = 256, /* lighting DMA overhead */ |
41 | .period_bytes_max = 2 * 0xffff, /* if 2 bytes format */ | |
42 | .periods_min = 8, | |
43 | .periods_max = 1024, /* no limit */ | |
c14e2591 | 44 | .buffer_bytes_max = 512 * 1024, |
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45 | }; |
46 | ||
47 | /** | |
48 | * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC | |
49 | * | |
50 | * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to | |
51 | * check if any overrun occured. | |
52 | */ | |
53 | static void atmel_pcm_dma_irq(u32 ssc_sr, | |
54 | struct snd_pcm_substream *substream) | |
55 | { | |
5fe668a1 | 56 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
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57 | struct atmel_pcm_dma_params *prtd; |
58 | ||
5fe668a1 | 59 | prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
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60 | |
61 | if (ssc_sr & prtd->mask->ssc_error) { | |
62 | if (snd_pcm_running(substream)) | |
63 | pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n", | |
64 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK | |
65 | ? "underrun" : "overrun", prtd->name, | |
66 | ssc_sr); | |
67 | ||
68 | /* stop RX and capture: will be enabled again at restart */ | |
69 | ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable); | |
1fb8510c | 70 | snd_pcm_stop_xrun(substream); |
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71 | |
72 | /* now drain RHR and read status to remove xrun condition */ | |
73 | ssc_readx(prtd->ssc->regs, SSC_RHR); | |
74 | ssc_readx(prtd->ssc->regs, SSC_SR); | |
75 | } | |
76 | } | |
77 | ||
3951e4aa | 78 | static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream, |
95e0e07e | 79 | struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) |
3951e4aa | 80 | { |
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81 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
82 | struct atmel_pcm_dma_params *prtd; | |
3951e4aa | 83 | struct ssc_device *ssc; |
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84 | int ret; |
85 | ||
95e0e07e | 86 | prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
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87 | ssc = prtd->ssc; |
88 | ||
95e0e07e | 89 | ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); |
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90 | if (ret) { |
91 | pr_err("atmel-pcm: hwparams to dma slave configure failed\n"); | |
92 | return ret; | |
93 | } | |
94 | ||
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95 | slave_config->dst_addr = ssc->phybase + SSC_THR; |
96 | slave_config->dst_maxburst = 1; | |
97 | ||
98 | slave_config->src_addr = ssc->phybase + SSC_RHR; | |
99 | slave_config->src_maxburst = 1; | |
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100 | |
101 | prtd->dma_intr_handler = atmel_pcm_dma_irq; | |
102 | ||
103 | return 0; | |
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104 | } |
105 | ||
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106 | static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = { |
107 | .prepare_slave_config = atmel_pcm_configure_dma, | |
108 | .pcm_hardware = &atmel_pcm_dma_hardware, | |
c14e2591 | 109 | .prealloc_buffer_size = 64 * 1024, |
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110 | }; |
111 | ||
112 | int atmel_pcm_dma_platform_register(struct device *dev) | |
113 | { | |
acde50a7 | 114 | return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0); |
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115 | } |
116 | EXPORT_SYMBOL(atmel_pcm_dma_platform_register); | |
117 | ||
118 | void atmel_pcm_dma_platform_unregister(struct device *dev) | |
119 | { | |
95e0e07e | 120 | snd_dmaengine_pcm_unregister(dev); |
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121 | } |
122 | EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister); | |
123 | ||
124 | MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>"); | |
125 | MODULE_DESCRIPTION("Atmel DMA based PCM module"); | |
126 | MODULE_LICENSE("GPL"); |