Initial playback support

arch/arm/boot/dts/zynq-zybo.dts

@@ -329,5 +329,37 @@
 			interrupts = <0 7 4>;
 			reg = <0xf8007100 0x20>;
 		} ;
+
+		i2c0: i2c@e0004000 {
+			bus-id = <0>;
+			compatible = "cdns,i2c-r1p10";
+			clock-frequency = <400000>;
+			status = "okay";
+			clocks = <&clkc 38>;
+			interrupt-parent = <&ps7_scugic_0>;
+			interrupts = <0 25 4>;
+			reg = <0xe0004000 0x1000>;
+			xlnx,has-interrupt = <0x0>;
+
+			ssm2602: ssm2602@1a {
+				compatible = "adi,ssm2602";
+				reg = <0x1a>;
+			};
+		};
+
+		axi_i2s: axi-i2s@0x43C10000 {
+			compatible = "adi,axi-i2s-1.00.a";
+			reg = <0x43C10000 0x1000>;
+			clocks = <&clkc 15 &clkc 17>;
+			clock-names = "axi", "ref";
+			dmas = <&ps7_dma_s 0 &ps7_dma_s 1>;
+			dma-names = "tx", "rx";
+		};
+
+		zybo_ssm2602_snd: zybo_ssm2602_snd {
+			compatible = "zybo-ssm2602-snd";
+			audio-codec = <&ssm2602>;
+			cpu-dai = <&axi_i2s>;
+		};
 	} ;
 } ;

sound/soc/Kconfig

@@ -54,6 +54,7 @@ source "sound/soc/spear/Kconfig"
 source "sound/soc/tegra/Kconfig"
 source "sound/soc/txx9/Kconfig"
 source "sound/soc/ux500/Kconfig"
+source "sound/soc/zybo/Kconfig"
 
 # Supported codecs
 source "sound/soc/codecs/Kconfig"

sound/soc/Makefile

@@ -31,3 +31,4 @@ obj-$(CONFIG_SND_SOC)	+= spear/
 obj-$(CONFIG_SND_SOC)	+= tegra/
 obj-$(CONFIG_SND_SOC)	+= txx9/
 obj-$(CONFIG_SND_SOC)	+= ux500/
+obj-$(CONFIG_SND_SOC)	+= zybo/

sound/soc/zybo/Kconfig

@@ -0,0 +1,6 @@
+config SND_SOC_ZYBO_SSM2602
+	tristate "Zybo board sound support"
+	depends on SND_SOC_ADI
+	depends on I2C
+	select SND_SOC_AXI_I2S
+	select SND_SOC_SSM2602

sound/soc/zybo/Makefile

@@ -0,0 +1,3 @@
+snd-soc-zybo-ssm2602-objs := zybo_ssm2602.o
+
+obj-$(CONFIG_SND_SOC_ZYBO_SSM2602) += snd-soc-zybo-ssm2602.o

sound/soc/zybo/zybo_ssm2602.c

@@ -0,0 +1,154 @@
+/*
+ *  Copyright (C) 2015
+ *	Author: Ferdinand Stehle <development@kondorgulasch.de>
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include "../codecs/ssm2602.h"
+
+static const struct snd_soc_dapm_widget zybo_ssm2602_widgets[] = {
+	SND_SOC_DAPM_SPK("Line Out", NULL),
+	SND_SOC_DAPM_HP("Headphone Out", NULL),
+	SND_SOC_DAPM_MIC("Mic In", NULL),
+	SND_SOC_DAPM_MIC("Line In", NULL),
+};
+
+static const struct snd_soc_dapm_route zybo_ssm2602_routes[] = {
+	{ "Line Out", NULL, "LOUT" },
+	{ "Line Out", NULL, "ROUT" },
+	{ "LLINEIN", NULL, "Line In" },
+	{ "RLINEIN", NULL, "Line In" },
+};
+
+static int zybo_ssm2602_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 *codec_dai = rtd->codec_dai;
+	unsigned int pll_rate;
+	int ret;
+
+	switch (params_rate(params)) {
+	case 48000:
+	case 8000:
+	case 12000:
+	case 16000:
+	case 24000:
+	case 32000:
+	case 96000:
+		pll_rate = 48000 * 1024;
+		break;
+	case 44100:
+	case 7350:
+	case 11025:
+	case 14700:
+	case 22050:
+	case 29400:
+	case 88200:
+		pll_rate = 44100 * 1024;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, SSM2602_SYSCLK, 12000000,
+		SND_SOC_CLOCK_IN);
+
+	return ret;
+}
+
+static struct snd_soc_ops zybo_ssm2602_ops = {
+	.hw_params = zybo_ssm2602_hw_params,
+};
+
+static struct snd_soc_dai_link zybo_ssm2602_dai_link = {
+	.name = "ssm2602",
+	.stream_name = "ssm2602",
+	.codec_dai_name = "ssm2602-hifi",
+	.dai_fmt = SND_SOC_DAIFMT_I2S |
+			SND_SOC_DAIFMT_NB_NF |
+			SND_SOC_DAIFMT_CBS_CFS,
+	.ops = &zybo_ssm2602_ops,
+};
+
+static struct snd_soc_card zybo_ssm2602_card = {
+	.name = "ZYBO SSM2602",
+	.owner = THIS_MODULE,
+	.dai_link = &zybo_ssm2602_dai_link,
+	.num_links = 1,
+	.dapm_widgets = zybo_ssm2602_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(zybo_ssm2602_widgets),
+	.dapm_routes = zybo_ssm2602_routes,
+	.num_dapm_routes = ARRAY_SIZE(zybo_ssm2602_routes),
+	.fully_routed = true,
+};
+
+static int zybo_ssm2602_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &zybo_ssm2602_card;
+	struct device_node *of_node = pdev->dev.of_node;
+
+	if (!of_node)
+		return -ENXIO;
+
+	card->dev = &pdev->dev;
+
+	zybo_ssm2602_dai_link.codec_of_node = of_parse_phandle(of_node, "audio-codec", 0);
+	zybo_ssm2602_dai_link.cpu_of_node = of_parse_phandle(of_node, "cpu-dai", 0);
+	zybo_ssm2602_dai_link.platform_of_node = zybo_ssm2602_dai_link.cpu_of_node;
+
+	if (!zybo_ssm2602_dai_link.codec_of_node ||
+		!zybo_ssm2602_dai_link.cpu_of_node)
+		return -ENXIO;
+
+	return snd_soc_register_card(card);
+}
+
+static int zybo_ssm2602_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_card(card);
+
+	return 0;
+}
+
+static const struct of_device_id zybo_ssm2602_of_match[] = {
+	{ .compatible = "zybo-ssm2602-snd", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, zybo_ssm2602_of_match);
+
+static struct platform_driver zybo_ssm2602_card_driver = {
+	.driver = {
+		.name = "zybo-ssm2602-snd",
+		.owner = THIS_MODULE,
+		.of_match_table = zybo_ssm2602_of_match,
+		.pm = &snd_soc_pm_ops,
+	},
+	.probe = zybo_ssm2602_probe,
+	.remove = zybo_ssm2602_remove,
+};
+module_platform_driver(zybo_ssm2602_card_driver);
+
+MODULE_DESCRIPTION("Zybo Zynq ssm2602 driver");
+MODULE_AUTHOR("Ferdinand Stehle <development@kondorgulasch.de>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:zybo-ssm2602-snd");