1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) ST-Ericsson SA 2012
4 *
5 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
6 *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
7 *         for ST-Ericsson.
8 *
9 * License terms:
10 */
11
12#include <asm/page.h>
13
14#include <linux/module.h>
15#include <linux/dma-mapping.h>
16#include <linux/dmaengine.h>
17#include <linux/slab.h>
18#include <linux/platform_data/dma-ste-dma40.h>
19
20#include <sound/pcm.h>
21#include <sound/pcm_params.h>
22#include <sound/soc.h>
23#include <sound/dmaengine_pcm.h>
24
25#include "ux500_msp_i2s.h"
26#include "ux500_pcm.h"
27
28#define UX500_PLATFORM_PERIODS_BYTES_MIN	128
29#define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
30#define UX500_PLATFORM_PERIODS_MIN		2
31#define UX500_PLATFORM_PERIODS_MAX		48
32#define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)
33
34static const struct snd_pcm_hardware ux500_pcm_hw = {
35	.info = SNDRV_PCM_INFO_INTERLEAVED |
36		SNDRV_PCM_INFO_MMAP |
37		SNDRV_PCM_INFO_RESUME |
38		SNDRV_PCM_INFO_PAUSE,
39	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
40	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
41	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
42	.periods_min = UX500_PLATFORM_PERIODS_MIN,
43	.periods_max = UX500_PLATFORM_PERIODS_MAX,
44};
45
46static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
47	struct snd_pcm_substream *substream)
48{
49	struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
50	u16 per_data_width, mem_data_width;
51	struct stedma40_chan_cfg *dma_cfg;
52	struct ux500_msp_dma_params *dma_params;
53
54	dma_params = snd_soc_dai_get_dma_data(dai, substream);
55	dma_cfg = dma_params->dma_cfg;
56
57	mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
58
59	switch (dma_params->data_size) {
60	case 32:
61		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
62		break;
63	case 16:
64		per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
65		break;
66	case 8:
67		per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
68		break;
69	default:
70		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
71	}
72
73	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
74		dma_cfg->src_info.data_width = mem_data_width;
75		dma_cfg->dst_info.data_width = per_data_width;
76	} else {
77		dma_cfg->src_info.data_width = per_data_width;
78		dma_cfg->dst_info.data_width = mem_data_width;
79	}
80
81	return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
82}
83
84static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
85		struct snd_pcm_hw_params *params,
86		struct dma_slave_config *slave_config)
87{
88	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
89	struct msp_i2s_platform_data *pdata = asoc_rtd_to_cpu(rtd, 0)->dev->platform_data;
90	struct snd_dmaengine_dai_dma_data *snd_dma_params;
91	struct ux500_msp_dma_params *ste_dma_params;
92	dma_addr_t dma_addr;
93	int ret;
94
95	if (pdata) {
96		ste_dma_params =
97			snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
98		dma_addr = ste_dma_params->tx_rx_addr;
99	} else {
100		snd_dma_params =
101			snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
102		dma_addr = snd_dma_params->addr;
103	}
104
105	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
106	if (ret)
107		return ret;
108
109	slave_config->dst_maxburst = 4;
110	slave_config->src_maxburst = 4;
111
112	slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
113	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
114
115	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
116		slave_config->dst_addr = dma_addr;
117	else
118		slave_config->src_addr = dma_addr;
119
120	return 0;
121}
122
123static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
124	.pcm_hardware = &ux500_pcm_hw,
125	.compat_request_channel = ux500_pcm_request_chan,
126	.prealloc_buffer_size = 128 * 1024,
127	.prepare_slave_config = ux500_pcm_prepare_slave_config,
128};
129
130static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
131	.compat_request_channel = ux500_pcm_request_chan,
132	.prepare_slave_config = ux500_pcm_prepare_slave_config,
133};
134
135int ux500_pcm_register_platform(struct platform_device *pdev)
136{
137	const struct snd_dmaengine_pcm_config *pcm_config;
138	struct device_node *np = pdev->dev.of_node;
139	int ret;
140
141	if (np)
142		pcm_config = &ux500_dmaengine_of_pcm_config;
143	else
144		pcm_config = &ux500_dmaengine_pcm_config;
145
146	ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
147					 SND_DMAENGINE_PCM_FLAG_COMPAT);
148	if (ret < 0) {
149		dev_err(&pdev->dev,
150			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
151			__func__, pdev->name, ret);
152		return ret;
153	}
154
155	return 0;
156}
157EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
158
159int ux500_pcm_unregister_platform(struct platform_device *pdev)
160{
161	snd_dmaengine_pcm_unregister(&pdev->dev);
162	return 0;
163}
164EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
165
166MODULE_AUTHOR("Ola Lilja");
167MODULE_AUTHOR("Roger Nilsson");
168MODULE_DESCRIPTION("ASoC UX500 driver");
169MODULE_LICENSE("GPL v2");
170