xref: /openbmc/linux/sound/soc/sh/migor.c (revision 4bb1eb3c)
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // ALSA SoC driver for Migo-R
4 //
5 // Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
6 
7 #include <linux/clkdev.h>
8 #include <linux/device.h>
9 #include <linux/firmware.h>
10 #include <linux/module.h>
11 
12 #include <asm/clock.h>
13 
14 #include <cpu/sh7722.h>
15 
16 #include <sound/core.h>
17 #include <sound/pcm.h>
18 #include <sound/soc.h>
19 
20 #include "../codecs/wm8978.h"
21 #include "siu.h"
22 
23 /* Default 8000Hz sampling frequency */
24 static unsigned long codec_freq = 8000 * 512;
25 
26 static unsigned int use_count;
27 
28 /* External clock, sourced from the codec at the SIUMCKB pin */
29 static unsigned long siumckb_recalc(struct clk *clk)
30 {
31 	return codec_freq;
32 }
33 
34 static struct sh_clk_ops siumckb_clk_ops = {
35 	.recalc = siumckb_recalc,
36 };
37 
38 static struct clk siumckb_clk = {
39 	.ops		= &siumckb_clk_ops,
40 	.rate		= 0, /* initialised at run-time */
41 };
42 
43 static struct clk_lookup *siumckb_lookup;
44 
45 static int migor_hw_params(struct snd_pcm_substream *substream,
46 			   struct snd_pcm_hw_params *params)
47 {
48 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
49 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
50 	int ret;
51 	unsigned int rate = params_rate(params);
52 
53 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 13000000,
54 				     SND_SOC_CLOCK_IN);
55 	if (ret < 0)
56 		return ret;
57 
58 	ret = snd_soc_dai_set_clkdiv(codec_dai, WM8978_OPCLKRATE, rate * 512);
59 	if (ret < 0)
60 		return ret;
61 
62 	codec_freq = rate * 512;
63 	/*
64 	 * This propagates the parent frequency change to children and
65 	 * recalculates the frequency table
66 	 */
67 	clk_set_rate(&siumckb_clk, codec_freq);
68 	dev_dbg(codec_dai->dev, "%s: configure %luHz\n", __func__, codec_freq);
69 
70 	ret = snd_soc_dai_set_sysclk(asoc_rtd_to_cpu(rtd, 0), SIU_CLKB_EXT,
71 				     codec_freq / 2, SND_SOC_CLOCK_IN);
72 
73 	if (!ret)
74 		use_count++;
75 
76 	return ret;
77 }
78 
79 static int migor_hw_free(struct snd_pcm_substream *substream)
80 {
81 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
82 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
83 
84 	if (use_count) {
85 		use_count--;
86 
87 		if (!use_count)
88 			snd_soc_dai_set_sysclk(codec_dai, WM8978_PLL, 0,
89 					       SND_SOC_CLOCK_IN);
90 	} else {
91 		dev_dbg(codec_dai->dev, "Unbalanced hw_free!\n");
92 	}
93 
94 	return 0;
95 }
96 
97 static const struct snd_soc_ops migor_dai_ops = {
98 	.hw_params = migor_hw_params,
99 	.hw_free = migor_hw_free,
100 };
101 
102 static const struct snd_soc_dapm_widget migor_dapm_widgets[] = {
103 	SND_SOC_DAPM_HP("Headphone", NULL),
104 	SND_SOC_DAPM_MIC("Onboard Microphone", NULL),
105 	SND_SOC_DAPM_MIC("External Microphone", NULL),
106 };
107 
108 static const struct snd_soc_dapm_route audio_map[] = {
109 	/* Headphone output connected to LHP/RHP, enable OUT4 for VMID */
110 	{ "Headphone", NULL,  "OUT4 VMID" },
111 	{ "OUT4 VMID", NULL,  "LHP" },
112 	{ "OUT4 VMID", NULL,  "RHP" },
113 
114 	/* On-board microphone */
115 	{ "RMICN", NULL, "Mic Bias" },
116 	{ "RMICP", NULL, "Mic Bias" },
117 	{ "Mic Bias", NULL, "Onboard Microphone" },
118 
119 	/* External microphone */
120 	{ "LMICN", NULL, "Mic Bias" },
121 	{ "LMICP", NULL, "Mic Bias" },
122 	{ "Mic Bias", NULL, "External Microphone" },
123 };
124 
125 /* migor digital audio interface glue - connects codec <--> CPU */
126 SND_SOC_DAILINK_DEFS(wm8978,
127 	DAILINK_COMP_ARRAY(COMP_CPU("siu-pcm-audio")),
128 	DAILINK_COMP_ARRAY(COMP_CODEC("wm8978.0-001a", "wm8978-hifi")),
129 	DAILINK_COMP_ARRAY(COMP_PLATFORM("siu-pcm-audio")));
130 
131 static struct snd_soc_dai_link migor_dai = {
132 	.name = "wm8978",
133 	.stream_name = "WM8978",
134 	.dai_fmt = SND_SOC_DAIFMT_NB_IF | SND_SOC_DAIFMT_I2S |
135 		   SND_SOC_DAIFMT_CBS_CFS,
136 	.ops = &migor_dai_ops,
137 	SND_SOC_DAILINK_REG(wm8978),
138 };
139 
140 /* migor audio machine driver */
141 static struct snd_soc_card snd_soc_migor = {
142 	.name = "Migo-R",
143 	.owner = THIS_MODULE,
144 	.dai_link = &migor_dai,
145 	.num_links = 1,
146 
147 	.dapm_widgets = migor_dapm_widgets,
148 	.num_dapm_widgets = ARRAY_SIZE(migor_dapm_widgets),
149 	.dapm_routes = audio_map,
150 	.num_dapm_routes = ARRAY_SIZE(audio_map),
151 };
152 
153 static struct platform_device *migor_snd_device;
154 
155 static int __init migor_init(void)
156 {
157 	int ret;
158 
159 	ret = clk_register(&siumckb_clk);
160 	if (ret < 0)
161 		return ret;
162 
163 	siumckb_lookup = clkdev_create(&siumckb_clk, "siumckb_clk", NULL);
164 	if (!siumckb_lookup) {
165 		ret = -ENOMEM;
166 		goto eclkdevalloc;
167 	}
168 
169 	/* Port number used on this machine: port B */
170 	migor_snd_device = platform_device_alloc("soc-audio", 1);
171 	if (!migor_snd_device) {
172 		ret = -ENOMEM;
173 		goto epdevalloc;
174 	}
175 
176 	platform_set_drvdata(migor_snd_device, &snd_soc_migor);
177 
178 	ret = platform_device_add(migor_snd_device);
179 	if (ret)
180 		goto epdevadd;
181 
182 	return 0;
183 
184 epdevadd:
185 	platform_device_put(migor_snd_device);
186 epdevalloc:
187 	clkdev_drop(siumckb_lookup);
188 eclkdevalloc:
189 	clk_unregister(&siumckb_clk);
190 	return ret;
191 }
192 
193 static void __exit migor_exit(void)
194 {
195 	clkdev_drop(siumckb_lookup);
196 	clk_unregister(&siumckb_clk);
197 	platform_device_unregister(migor_snd_device);
198 }
199 
200 module_init(migor_init);
201 module_exit(migor_exit);
202 
203 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
204 MODULE_DESCRIPTION("ALSA SoC Migor");
205 MODULE_LICENSE("GPL v2");
206