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