1
2
3
4
5
6
7
8
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
25static 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
38static 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
56static 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
79static 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
85static const struct snd_soc_component_driver xlnx_i2s_component = {
86 .name = DRV_NAME,
87};
88
89static 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};
94MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);
95
96static int xlnx_i2s_probe(struct platform_device *pdev)
97{
98 struct resource *res;
99 void __iomem *base;
100 struct snd_soc_dai_driver *dai_drv;
101 int ret;
102 u32 ch, format, data_width;
103 struct device *dev = &pdev->dev;
104 struct device_node *node = dev->of_node;
105
106 dai_drv = devm_kzalloc(&pdev->dev, sizeof(*dai_drv), GFP_KERNEL);
107 if (!dai_drv)
108 return -ENOMEM;
109
110 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
111 base = devm_ioremap_resource(&pdev->dev, res);
112 if (IS_ERR(base))
113 return PTR_ERR(base);
114
115 ret = of_property_read_u32(node, "xlnx,num-channels", &ch);
116 if (ret < 0) {
117 dev_err(dev, "cannot get supported channels\n");
118 return ret;
119 }
120 ch = ch * 2;
121
122 ret = of_property_read_u32(node, "xlnx,dwidth", &data_width);
123 if (ret < 0) {
124 dev_err(dev, "cannot get data width\n");
125 return ret;
126 }
127 switch (data_width) {
128 case 16:
129 format = SNDRV_PCM_FMTBIT_S16_LE;
130 break;
131 case 24:
132 format = SNDRV_PCM_FMTBIT_S24_LE;
133 break;
134 default:
135 return -EINVAL;
136 }
137
138 if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {
139 dai_drv->name = "xlnx_i2s_playback";
140 dai_drv->playback.stream_name = "Playback";
141 dai_drv->playback.formats = format;
142 dai_drv->playback.channels_min = ch;
143 dai_drv->playback.channels_max = ch;
144 dai_drv->playback.rates = SNDRV_PCM_RATE_8000_192000;
145 dai_drv->ops = &xlnx_i2s_dai_ops;
146 } else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
147 dai_drv->name = "xlnx_i2s_capture";
148 dai_drv->capture.stream_name = "Capture";
149 dai_drv->capture.formats = format;
150 dai_drv->capture.channels_min = ch;
151 dai_drv->capture.channels_max = ch;
152 dai_drv->capture.rates = SNDRV_PCM_RATE_8000_192000;
153 dai_drv->ops = &xlnx_i2s_dai_ops;
154 } else {
155 return -ENODEV;
156 }
157
158 dev_set_drvdata(&pdev->dev, base);
159
160 ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
161 dai_drv, 1);
162 if (ret) {
163 dev_err(&pdev->dev, "i2s component registration failed\n");
164 return ret;
165 }
166
167 dev_info(&pdev->dev, "%s DAI registered\n", dai_drv->name);
168
169 return ret;
170}
171
172static struct platform_driver xlnx_i2s_aud_driver = {
173 .driver = {
174 .name = DRV_NAME,
175 .of_match_table = xlnx_i2s_of_match,
176 },
177 .probe = xlnx_i2s_probe,
178};
179
180module_platform_driver(xlnx_i2s_aud_driver);
181
182MODULE_LICENSE("GPL v2");
183MODULE_AUTHOR("Praveen Vuppala <praveenv@xilinx.com>");
184MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");
185
