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Seungwhan Younb67089e2010-10-12 20:58:52 +09001/*
2 * smdk_spdif.c -- S/PDIF audio for SMDK
3 *
4 * Copyright 2010 Samsung Electronics Co. Ltd.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 */
12
Seungwhan Younb67089e2010-10-12 20:58:52 +090013#include <linux/clk.h>
Paul Gortmakerda155d52011-07-15 12:38:28 -040014#include <linux/module.h>
Seungwhan Younb67089e2010-10-12 20:58:52 +090015
Seungwhan Younb67089e2010-10-12 20:58:52 +090016#include <sound/soc.h>
17
Seungwhan Younb67089e2010-10-12 20:58:52 +090018#include "spdif.h"
19
20/* Audio clock settings are belonged to board specific part. Every
21 * board can set audio source clock setting which is matched with H/W
22 * like this function-'set_audio_clock_heirachy'.
23 */
24static int set_audio_clock_heirachy(struct platform_device *pdev)
25{
26 struct clk *fout_epll, *mout_epll, *sclk_audio0, *sclk_spdif;
Seungwhan Younb0d8bef2010-12-06 07:56:59 +090027 int ret = 0;
Seungwhan Younb67089e2010-10-12 20:58:52 +090028
29 fout_epll = clk_get(NULL, "fout_epll");
30 if (IS_ERR(fout_epll)) {
31 printk(KERN_WARNING "%s: Cannot find fout_epll.\n",
32 __func__);
33 return -EINVAL;
34 }
35
36 mout_epll = clk_get(NULL, "mout_epll");
Vasiliy Kulikov8575d932010-11-21 20:40:21 +030037 if (IS_ERR(mout_epll)) {
Seungwhan Younb67089e2010-10-12 20:58:52 +090038 printk(KERN_WARNING "%s: Cannot find mout_epll.\n",
39 __func__);
40 ret = -EINVAL;
41 goto out1;
42 }
43
44 sclk_audio0 = clk_get(&pdev->dev, "sclk_audio");
45 if (IS_ERR(sclk_audio0)) {
46 printk(KERN_WARNING "%s: Cannot find sclk_audio.\n",
47 __func__);
48 ret = -EINVAL;
49 goto out2;
50 }
51
52 sclk_spdif = clk_get(NULL, "sclk_spdif");
Vasiliy Kulikov8575d932010-11-21 20:40:21 +030053 if (IS_ERR(sclk_spdif)) {
Seungwhan Younb67089e2010-10-12 20:58:52 +090054 printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n",
55 __func__);
56 ret = -EINVAL;
57 goto out3;
58 }
59
Uwe Kleine-Königb5950762010-11-01 15:38:34 -040060 /* Set audio clock hierarchy for S/PDIF */
Seungwhan Younb67089e2010-10-12 20:58:52 +090061 clk_set_parent(mout_epll, fout_epll);
62 clk_set_parent(sclk_audio0, mout_epll);
63 clk_set_parent(sclk_spdif, sclk_audio0);
64
65 clk_put(sclk_spdif);
66out3:
67 clk_put(sclk_audio0);
68out2:
69 clk_put(mout_epll);
70out1:
71 clk_put(fout_epll);
72
73 return ret;
74}
75
76/* We should haved to set clock directly on this part because of clock
77 * scheme of Samsudng SoCs did not support to set rates from abstrct
Uwe Kleine-Königb5950762010-11-01 15:38:34 -040078 * clock of it's hierarchy.
Seungwhan Younb67089e2010-10-12 20:58:52 +090079 */
80static int set_audio_clock_rate(unsigned long epll_rate,
81 unsigned long audio_rate)
82{
83 struct clk *fout_epll, *sclk_spdif;
84
85 fout_epll = clk_get(NULL, "fout_epll");
86 if (IS_ERR(fout_epll)) {
87 printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
88 return -ENOENT;
89 }
90
91 clk_set_rate(fout_epll, epll_rate);
92 clk_put(fout_epll);
93
94 sclk_spdif = clk_get(NULL, "sclk_spdif");
95 if (IS_ERR(sclk_spdif)) {
96 printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__);
97 return -ENOENT;
98 }
99
100 clk_set_rate(sclk_spdif, audio_rate);
101 clk_put(sclk_spdif);
102
103 return 0;
104}
105
106static int smdk_hw_params(struct snd_pcm_substream *substream,
107 struct snd_pcm_hw_params *params)
108{
109 struct snd_soc_pcm_runtime *rtd = substream->private_data;
110 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
111 unsigned long pll_out, rclk_rate;
112 int ret, ratio;
113
114 switch (params_rate(params)) {
115 case 44100:
116 pll_out = 45158400;
117 break;
118 case 32000:
119 case 48000:
120 case 96000:
121 pll_out = 49152000;
122 break;
123 default:
124 return -EINVAL;
125 }
126
127 /* Setting ratio to 512fs helps to use S/PDIF with HDMI without
128 * modify S/PDIF ASoC machine driver.
129 */
130 ratio = 512;
131 rclk_rate = params_rate(params) * ratio;
132
133 /* Set audio source clock rates */
134 ret = set_audio_clock_rate(pll_out, rclk_rate);
135 if (ret < 0)
136 return ret;
137
138 /* Set S/PDIF uses internal source clock */
139 ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK,
140 rclk_rate, SND_SOC_CLOCK_IN);
141 if (ret < 0)
142 return ret;
143
144 return ret;
145}
146
147static struct snd_soc_ops smdk_spdif_ops = {
148 .hw_params = smdk_hw_params,
149};
150
Seungwhan Younb67089e2010-10-12 20:58:52 +0900151static struct snd_soc_dai_link smdk_dai = {
152 .name = "S/PDIF",
153 .stream_name = "S/PDIF PCM Playback",
Padmavathi Vennaa08485d2012-12-07 13:59:21 +0530154 .platform_name = "samsung-spdif",
Seungwhan Younb67089e2010-10-12 20:58:52 +0900155 .cpu_dai_name = "samsung-spdif",
156 .codec_dai_name = "dit-hifi",
157 .codec_name = "spdif-dit",
158 .ops = &smdk_spdif_ops,
159};
160
161static struct snd_soc_card smdk = {
162 .name = "SMDK-S/PDIF",
Axel Lin095d79d2011-12-22 10:53:15 +0800163 .owner = THIS_MODULE,
Seungwhan Younb67089e2010-10-12 20:58:52 +0900164 .dai_link = &smdk_dai,
165 .num_links = 1,
166};
167
168static struct platform_device *smdk_snd_spdif_dit_device;
169static struct platform_device *smdk_snd_spdif_device;
170
171static int __init smdk_init(void)
172{
173 int ret;
174
175 smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1);
176 if (!smdk_snd_spdif_dit_device)
177 return -ENOMEM;
178
179 ret = platform_device_add(smdk_snd_spdif_dit_device);
180 if (ret)
Axel Lind4823372010-11-26 14:54:42 +0800181 goto err1;
Seungwhan Younb67089e2010-10-12 20:58:52 +0900182
183 smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1);
184 if (!smdk_snd_spdif_device) {
185 ret = -ENOMEM;
186 goto err2;
187 }
188
189 platform_set_drvdata(smdk_snd_spdif_device, &smdk);
190
191 ret = platform_device_add(smdk_snd_spdif_device);
192 if (ret)
Axel Lind4823372010-11-26 14:54:42 +0800193 goto err3;
Seungwhan Younb67089e2010-10-12 20:58:52 +0900194
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400195 /* Set audio clock hierarchy manually */
Seungwhan Younb67089e2010-10-12 20:58:52 +0900196 ret = set_audio_clock_heirachy(smdk_snd_spdif_device);
197 if (ret)
Axel Lind4823372010-11-26 14:54:42 +0800198 goto err4;
Seungwhan Younb67089e2010-10-12 20:58:52 +0900199
200 return 0;
Axel Lind4823372010-11-26 14:54:42 +0800201err4:
202 platform_device_del(smdk_snd_spdif_device);
203err3:
Seungwhan Younb67089e2010-10-12 20:58:52 +0900204 platform_device_put(smdk_snd_spdif_device);
205err2:
Axel Lind4823372010-11-26 14:54:42 +0800206 platform_device_del(smdk_snd_spdif_dit_device);
207err1:
Seungwhan Younb67089e2010-10-12 20:58:52 +0900208 platform_device_put(smdk_snd_spdif_dit_device);
209 return ret;
210}
211
212static void __exit smdk_exit(void)
213{
214 platform_device_unregister(smdk_snd_spdif_device);
Axel Lind4823372010-11-26 14:54:42 +0800215 platform_device_unregister(smdk_snd_spdif_dit_device);
Seungwhan Younb67089e2010-10-12 20:58:52 +0900216}
217
218module_init(smdk_init);
219module_exit(smdk_exit);
220
221MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
222MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF");
223MODULE_LICENSE("GPL");