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 = substream->private_data; 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 = substream->private_data; 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