1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Xilinx ASoC I2S audio support
4 //
5 // Copyright (C) 2018 Xilinx, Inc.
6 //
7 // Author: Praveen Vuppala <praveenv@xilinx.com>
8 // Author: Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>
9 
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_platform.h>
14 #include <linux/platform_device.h>
15 #include <sound/pcm_params.h>
16 #include <sound/soc.h>
17 
18 #define DRV_NAME "xlnx_i2s"
19 
20 #define I2S_CORE_CTRL_OFFSET		0x08
21 #define I2S_I2STIM_OFFSET		0x20
22 #define I2S_CH0_OFFSET			0x30
23 #define I2S_I2STIM_VALID_MASK		GENMASK(7, 0)
24 
xlnx_i2s_set_sclkout_div(struct snd_soc_dai * cpu_dai,int div_id,int div)25 static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,
26 				    int div_id, int div)
27 {
28 	void __iomem *base = snd_soc_dai_get_drvdata(cpu_dai);
29 
30 	if (!div || (div & ~I2S_I2STIM_VALID_MASK))
31 		return -EINVAL;
32 
33 	writel(div, base + I2S_I2STIM_OFFSET);
34 
35 	return 0;
36 }
37 
xlnx_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * i2s_dai)38 static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream,
39 			      struct snd_pcm_hw_params *params,
40 			      struct snd_soc_dai *i2s_dai)
41 {
42 	u32 reg_off, chan_id;
43 	void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);
44 
45 	chan_id = params_channels(params) / 2;
46 
47 	while (chan_id > 0) {
48 		reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);
49 		writel(chan_id, base + reg_off);
50 		chan_id--;
51 	}
52 
53 	return 0;
54 }
55 
xlnx_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * i2s_dai)56 static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
57 			    struct snd_soc_dai *i2s_dai)
58 {
59 	void __iomem *base = snd_soc_dai_get_drvdata(i2s_dai);
60 
61 	switch (cmd) {
62 	case SNDRV_PCM_TRIGGER_START:
63 	case SNDRV_PCM_TRIGGER_RESUME:
64 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
65 		writel(1, base + I2S_CORE_CTRL_OFFSET);
66 		break;
67 	case SNDRV_PCM_TRIGGER_STOP:
68 	case SNDRV_PCM_TRIGGER_SUSPEND:
69 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
70 		writel(0, base + I2S_CORE_CTRL_OFFSET);
71 		break;
72 	default:
73 		return -EINVAL;
74 	}
75 
76 	return 0;
77 }
78 
79 static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = {
80 	.trigger = xlnx_i2s_trigger,
81 	.set_clkdiv = xlnx_i2s_set_sclkout_div,
82 	.hw_params = xlnx_i2s_hw_params
83 };
84 
85 static const struct snd_soc_component_driver xlnx_i2s_component = {
86 	.name = DRV_NAME,
87 };
88 
89 static const struct of_device_id xlnx_i2s_of_match[] = {
90 	{ .compatible = "xlnx,i2s-transmitter-1.0", },
91 	{ .compatible = "xlnx,i2s-receiver-1.0", },
92 	{},
93 };
94 MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);
95 
xlnx_i2s_probe(struct platform_device * pdev)96 static int xlnx_i2s_probe(struct platform_device *pdev)
97 {
98 	void __iomem *base;
99 	struct snd_soc_dai_driver *dai_drv;
100 	int ret;
101 	u32 ch, format, data_width;
102 	struct device *dev = &pdev->dev;
103 	struct device_node *node = dev->of_node;
104 
105 	dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
106 	if (!dai_drv)
107 		return -ENOMEM;
108 
109 	base = devm_platform_ioremap_resource(pdev, 0);
110 	if (IS_ERR(base))
111 		return PTR_ERR(base);
112 
113 	ret = of_property_read_u32(node, "xlnx,num-channels", &ch);
114 	if (ret < 0) {
115 		dev_err(dev, "cannot get supported channels\n");
116 		return ret;
117 	}
118 	ch = ch * 2;
119 
120 	ret = of_property_read_u32(node, "xlnx,dwidth", &data_width);
121 	if (ret < 0) {
122 		dev_err(dev, "cannot get data width\n");
123 		return ret;
124 	}
125 	switch (data_width) {
126 	case 16:
127 		format = SNDRV_PCM_FMTBIT_S16_LE;
128 		break;
129 	case 24:
130 		format = SNDRV_PCM_FMTBIT_S24_LE;
131 		break;
132 	default:
133 		return -EINVAL;
134 	}
135 
136 	if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {
137 		dai_drv->name = "xlnx_i2s_playback";
138 		dai_drv->playback.stream_name = "Playback";
139 		dai_drv->playback.formats = format;
140 		dai_drv->playback.channels_min = ch;
141 		dai_drv->playback.channels_max = ch;
142 		dai_drv->playback.rates	= SNDRV_PCM_RATE_8000_192000;
143 		dai_drv->ops = &xlnx_i2s_dai_ops;
144 	} else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
145 		dai_drv->name = "xlnx_i2s_capture";
146 		dai_drv->capture.stream_name = "Capture";
147 		dai_drv->capture.formats = format;
148 		dai_drv->capture.channels_min = ch;
149 		dai_drv->capture.channels_max = ch;
150 		dai_drv->capture.rates = SNDRV_PCM_RATE_8000_192000;
151 		dai_drv->ops = &xlnx_i2s_dai_ops;
152 	} else {
153 		return -ENODEV;
154 	}
155 
156 	dev_set_drvdata(&pdev->dev, base);
157 
158 	ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
159 					      dai_drv, 1);
160 	if (ret) {
161 		dev_err(&pdev->dev, "i2s component registration failed\n");
162 		return ret;
163 	}
164 
165 	dev_info(&pdev->dev, "%s DAI registered\n", dai_drv->name);
166 
167 	return ret;
168 }
169 
170 static struct platform_driver xlnx_i2s_aud_driver = {
171 	.driver = {
172 		.name = DRV_NAME,
173 		.of_match_table = xlnx_i2s_of_match,
174 	},
175 	.probe = xlnx_i2s_probe,
176 };
177 
178 module_platform_driver(xlnx_i2s_aud_driver);
179 
180 MODULE_LICENSE("GPL v2");
181 MODULE_AUTHOR("Praveen Vuppala  <praveenv@xilinx.com>");
182 MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");
183