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 */
siumckb_recalc(struct clk * clk)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
migor_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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
migor_hw_free(struct snd_pcm_substream * substream)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
migor_init(void)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
migor_exit(void)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