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