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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 | // SPDX-License-Identifier: GPL-2.0+ // // smdk_spdif.c - S/PDIF audio for SMDK // // Copyright (C) 2010 Samsung Electronics Co., Ltd. #include <linux/clk.h> #include <linux/module.h> #include <sound/soc.h> #include "spdif.h" /* Audio clock settings are belonged to board specific part. Every * board can set audio source clock setting which is matched with H/W * like this function-'set_audio_clock_heirachy'. */ static int set_audio_clock_heirachy(struct platform_device *pdev) { struct clk *fout_epll, *mout_epll, *sclk_audio0, *sclk_spdif; int ret = 0; fout_epll = clk_get(NULL, "fout_epll"); if (IS_ERR(fout_epll)) { printk(KERN_WARNING "%s: Cannot find fout_epll.\n", __func__); return -EINVAL; } mout_epll = clk_get(NULL, "mout_epll"); if (IS_ERR(mout_epll)) { printk(KERN_WARNING "%s: Cannot find mout_epll.\n", __func__); ret = -EINVAL; goto out1; } sclk_audio0 = clk_get(&pdev->dev, "sclk_audio"); if (IS_ERR(sclk_audio0)) { printk(KERN_WARNING "%s: Cannot find sclk_audio.\n", __func__); ret = -EINVAL; goto out2; } sclk_spdif = clk_get(NULL, "sclk_spdif"); if (IS_ERR(sclk_spdif)) { printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n", __func__); ret = -EINVAL; goto out3; } /* Set audio clock hierarchy for S/PDIF */ clk_set_parent(mout_epll, fout_epll); clk_set_parent(sclk_audio0, mout_epll); clk_set_parent(sclk_spdif, sclk_audio0); clk_put(sclk_spdif); out3: clk_put(sclk_audio0); out2: clk_put(mout_epll); out1: clk_put(fout_epll); return ret; } /* We should haved to set clock directly on this part because of clock * scheme of Samsudng SoCs did not support to set rates from abstrct * clock of it's hierarchy. */ static int set_audio_clock_rate(unsigned long epll_rate, unsigned long audio_rate) { struct clk *fout_epll, *sclk_spdif; fout_epll = clk_get(NULL, "fout_epll"); if (IS_ERR(fout_epll)) { printk(KERN_ERR "%s: failed to get fout_epll\n", __func__); return -ENOENT; } clk_set_rate(fout_epll, epll_rate); clk_put(fout_epll); sclk_spdif = clk_get(NULL, "sclk_spdif"); if (IS_ERR(sclk_spdif)) { printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__); return -ENOENT; } clk_set_rate(sclk_spdif, audio_rate); clk_put(sclk_spdif); return 0; } static int smdk_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); unsigned long pll_out, rclk_rate; int ret, ratio; switch (params_rate(params)) { case 44100: pll_out = 45158400; break; case 32000: case 48000: case 96000: pll_out = 49152000; break; default: return -EINVAL; } /* Setting ratio to 512fs helps to use S/PDIF with HDMI without * modify S/PDIF ASoC machine driver. */ ratio = 512; rclk_rate = params_rate(params) * ratio; /* Set audio source clock rates */ ret = set_audio_clock_rate(pll_out, rclk_rate); if (ret < 0) return ret; /* Set S/PDIF uses internal source clock */ ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK, rclk_rate, SND_SOC_CLOCK_IN); if (ret < 0) return ret; return ret; } static const struct snd_soc_ops smdk_spdif_ops = { .hw_params = smdk_hw_params, }; SND_SOC_DAILINK_DEFS(spdif, DAILINK_COMP_ARRAY(COMP_CPU("samsung-spdif")), DAILINK_COMP_ARRAY(COMP_CODEC("spdif-dit", "dit-hifi")), DAILINK_COMP_ARRAY(COMP_PLATFORM("samsung-spdif"))); static struct snd_soc_dai_link smdk_dai = { .name = "S/PDIF", .stream_name = "S/PDIF PCM Playback", .ops = &smdk_spdif_ops, SND_SOC_DAILINK_REG(spdif), }; static struct snd_soc_card smdk = { .name = "SMDK-S/PDIF", .owner = THIS_MODULE, .dai_link = &smdk_dai, .num_links = 1, }; static struct platform_device *smdk_snd_spdif_dit_device; static struct platform_device *smdk_snd_spdif_device; static int __init smdk_init(void) { int ret; smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1); if (!smdk_snd_spdif_dit_device) return -ENOMEM; ret = platform_device_add(smdk_snd_spdif_dit_device); if (ret) goto err1; smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1); if (!smdk_snd_spdif_device) { ret = -ENOMEM; goto err2; } platform_set_drvdata(smdk_snd_spdif_device, &smdk); ret = platform_device_add(smdk_snd_spdif_device); if (ret) goto err3; /* Set audio clock hierarchy manually */ ret = set_audio_clock_heirachy(smdk_snd_spdif_device); if (ret) goto err4; return 0; err4: platform_device_del(smdk_snd_spdif_device); err3: platform_device_put(smdk_snd_spdif_device); err2: platform_device_del(smdk_snd_spdif_dit_device); err1: platform_device_put(smdk_snd_spdif_dit_device); return ret; } static void __exit smdk_exit(void) { platform_device_unregister(smdk_snd_spdif_device); platform_device_unregister(smdk_snd_spdif_dit_device); } module_init(smdk_init); module_exit(smdk_exit); MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>"); MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF"); MODULE_LICENSE("GPL"); |