--- /dev/null
- /* Set audio clock heirachy for S/PDIF */
+ /*
+ * smdk_spdif.c -- S/PDIF audio for SMDK
+ *
+ * Copyright 2010 Samsung Electronics Co. Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ */
+
+ #include <linux/module.h>
+ #include <linux/device.h>
+ #include <linux/clk.h>
+
+ #include <plat/devs.h>
+
+ #include <sound/soc.h>
+
+ #include "dma.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;
+ }
+
- * clock of it's heirachy.
++ /* 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
- /* Set audio clock heirachy manually */
++ * 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 = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ 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 struct snd_soc_ops smdk_spdif_ops = {
+ .hw_params = smdk_hw_params,
+ };
+
+ static struct snd_soc_dai_link smdk_dai = {
+ .name = "S/PDIF",
+ .stream_name = "S/PDIF PCM Playback",
+ .platform_name = "samsung-audio",
+ .cpu_dai_name = "samsung-spdif",
+ .codec_dai_name = "dit-hifi",
+ .codec_name = "spdif-dit",
+ .ops = &smdk_spdif_ops,
+ };
+
+ static struct snd_soc_card smdk = {
+ .name = "SMDK-S/PDIF",
+ .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");
projects / cascardo / linux.git / commitdiff