Merge tag 'rproc-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/remoteproc...
[linux-2.6-microblaze.git] / sound / soc / xilinx / xlnx_i2s.c
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_CORE_CTRL_32BIT_LRCLK       BIT(3)
22 #define I2S_CORE_CTRL_ENABLE            BIT(0)
23 #define I2S_I2STIM_OFFSET               0x20
24 #define I2S_CH0_OFFSET                  0x30
25 #define I2S_I2STIM_VALID_MASK           GENMASK(7, 0)
26
27 struct xlnx_i2s_drv_data {
28         struct snd_soc_dai_driver dai_drv;
29         void __iomem *base;
30         unsigned int sysclk;
31         u32 data_width;
32         u32 channels;
33         bool is_32bit_lrclk;
34         struct snd_ratnum ratnum;
35         struct snd_pcm_hw_constraint_ratnums rate_constraints;
36 };
37
38 static int xlnx_i2s_set_sclkout_div(struct snd_soc_dai *cpu_dai,
39                                     int div_id, int div)
40 {
41         struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(cpu_dai);
42
43         if (!div || (div & ~I2S_I2STIM_VALID_MASK))
44                 return -EINVAL;
45
46         drv_data->sysclk = 0;
47
48         writel(div, drv_data->base + I2S_I2STIM_OFFSET);
49
50         return 0;
51 }
52
53 static int xlnx_i2s_set_sysclk(struct snd_soc_dai *dai,
54                                int clk_id, unsigned int freq, int dir)
55 {
56         struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
57
58         drv_data->sysclk = freq;
59         if (freq) {
60                 unsigned int bits_per_sample;
61
62                 if (drv_data->is_32bit_lrclk)
63                         bits_per_sample = 32;
64                 else
65                         bits_per_sample = drv_data->data_width;
66
67                 drv_data->ratnum.num = freq / (bits_per_sample * drv_data->channels) / 2;
68                 drv_data->ratnum.den_step = 1;
69                 drv_data->ratnum.den_min = 1;
70                 drv_data->ratnum.den_max = 255;
71                 drv_data->rate_constraints.rats = &drv_data->ratnum;
72                 drv_data->rate_constraints.nrats = 1;
73         }
74         return 0;
75 }
76
77 static int xlnx_i2s_startup(struct snd_pcm_substream *substream,
78                             struct snd_soc_dai *dai)
79 {
80         struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(dai);
81
82         if (drv_data->sysclk)
83                 return snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
84                                                      SNDRV_PCM_HW_PARAM_RATE,
85                                                      &drv_data->rate_constraints);
86
87         return 0;
88 }
89
90 static int xlnx_i2s_hw_params(struct snd_pcm_substream *substream,
91                               struct snd_pcm_hw_params *params,
92                               struct snd_soc_dai *i2s_dai)
93 {
94         u32 reg_off, chan_id;
95         struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(i2s_dai);
96
97         if (drv_data->sysclk) {
98                 unsigned int bits_per_sample, sclk, sclk_div;
99
100                 if (drv_data->is_32bit_lrclk)
101                         bits_per_sample = 32;
102                 else
103                         bits_per_sample = drv_data->data_width;
104
105                 sclk = params_rate(params) * bits_per_sample * params_channels(params);
106                 sclk_div = drv_data->sysclk / sclk / 2;
107
108                 if ((drv_data->sysclk % sclk != 0) ||
109                     !sclk_div || (sclk_div & ~I2S_I2STIM_VALID_MASK)) {
110                         dev_warn(i2s_dai->dev, "invalid SCLK divisor for sysclk %u and sclk %u\n",
111                                  drv_data->sysclk, sclk);
112                         return -EINVAL;
113                 }
114                 writel(sclk_div, drv_data->base + I2S_I2STIM_OFFSET);
115         }
116
117         chan_id = params_channels(params) / 2;
118
119         while (chan_id > 0) {
120                 reg_off = I2S_CH0_OFFSET + ((chan_id - 1) * 4);
121                 writel(chan_id, drv_data->base + reg_off);
122                 chan_id--;
123         }
124
125         return 0;
126 }
127
128 static int xlnx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
129                             struct snd_soc_dai *i2s_dai)
130 {
131         struct xlnx_i2s_drv_data *drv_data = snd_soc_dai_get_drvdata(i2s_dai);
132
133         switch (cmd) {
134         case SNDRV_PCM_TRIGGER_START:
135         case SNDRV_PCM_TRIGGER_RESUME:
136         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
137                 writel(I2S_CORE_CTRL_ENABLE, drv_data->base + I2S_CORE_CTRL_OFFSET);
138                 break;
139         case SNDRV_PCM_TRIGGER_STOP:
140         case SNDRV_PCM_TRIGGER_SUSPEND:
141         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
142                 writel(0, drv_data->base + I2S_CORE_CTRL_OFFSET);
143                 break;
144         default:
145                 return -EINVAL;
146         }
147
148         return 0;
149 }
150
151 static const struct snd_soc_dai_ops xlnx_i2s_dai_ops = {
152         .trigger = xlnx_i2s_trigger,
153         .set_sysclk = xlnx_i2s_set_sysclk,
154         .set_clkdiv = xlnx_i2s_set_sclkout_div,
155         .startup = xlnx_i2s_startup,
156         .hw_params = xlnx_i2s_hw_params
157 };
158
159 static const struct snd_soc_component_driver xlnx_i2s_component = {
160         .name = DRV_NAME,
161 };
162
163 static const struct of_device_id xlnx_i2s_of_match[] = {
164         { .compatible = "xlnx,i2s-transmitter-1.0", },
165         { .compatible = "xlnx,i2s-receiver-1.0", },
166         {},
167 };
168 MODULE_DEVICE_TABLE(of, xlnx_i2s_of_match);
169
170 static int xlnx_i2s_probe(struct platform_device *pdev)
171 {
172         struct xlnx_i2s_drv_data *drv_data;
173         int ret;
174         u32 format;
175         struct device *dev = &pdev->dev;
176         struct device_node *node = dev->of_node;
177
178         drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
179         if (!drv_data)
180                 return -ENOMEM;
181
182         drv_data->base = devm_platform_ioremap_resource(pdev, 0);
183         if (IS_ERR(drv_data->base))
184                 return PTR_ERR(drv_data->base);
185
186         ret = of_property_read_u32(node, "xlnx,num-channels", &drv_data->channels);
187         if (ret < 0) {
188                 dev_err(dev, "cannot get supported channels\n");
189                 return ret;
190         }
191         drv_data->channels *= 2;
192
193         ret = of_property_read_u32(node, "xlnx,dwidth", &drv_data->data_width);
194         if (ret < 0) {
195                 dev_err(dev, "cannot get data width\n");
196                 return ret;
197         }
198         switch (drv_data->data_width) {
199         case 16:
200                 format = SNDRV_PCM_FMTBIT_S16_LE;
201                 break;
202         case 24:
203                 format = SNDRV_PCM_FMTBIT_S24_LE;
204                 break;
205         default:
206                 return -EINVAL;
207         }
208
209         if (of_device_is_compatible(node, "xlnx,i2s-transmitter-1.0")) {
210                 drv_data->dai_drv.name = "xlnx_i2s_playback";
211                 drv_data->dai_drv.playback.stream_name = "Playback";
212                 drv_data->dai_drv.playback.formats = format;
213                 drv_data->dai_drv.playback.channels_min = drv_data->channels;
214                 drv_data->dai_drv.playback.channels_max = drv_data->channels;
215                 drv_data->dai_drv.playback.rates        = SNDRV_PCM_RATE_8000_192000;
216                 drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
217         } else if (of_device_is_compatible(node, "xlnx,i2s-receiver-1.0")) {
218                 drv_data->dai_drv.name = "xlnx_i2s_capture";
219                 drv_data->dai_drv.capture.stream_name = "Capture";
220                 drv_data->dai_drv.capture.formats = format;
221                 drv_data->dai_drv.capture.channels_min = drv_data->channels;
222                 drv_data->dai_drv.capture.channels_max = drv_data->channels;
223                 drv_data->dai_drv.capture.rates = SNDRV_PCM_RATE_8000_192000;
224                 drv_data->dai_drv.ops = &xlnx_i2s_dai_ops;
225         } else {
226                 return -ENODEV;
227         }
228         drv_data->is_32bit_lrclk = readl(drv_data->base + I2S_CORE_CTRL_OFFSET) &
229                                    I2S_CORE_CTRL_32BIT_LRCLK;
230
231         dev_set_drvdata(&pdev->dev, drv_data);
232
233         ret = devm_snd_soc_register_component(&pdev->dev, &xlnx_i2s_component,
234                                               &drv_data->dai_drv, 1);
235         if (ret) {
236                 dev_err(&pdev->dev, "i2s component registration failed\n");
237                 return ret;
238         }
239
240         dev_info(&pdev->dev, "%s DAI registered\n", drv_data->dai_drv.name);
241
242         return ret;
243 }
244
245 static struct platform_driver xlnx_i2s_aud_driver = {
246         .driver = {
247                 .name = DRV_NAME,
248                 .of_match_table = xlnx_i2s_of_match,
249         },
250         .probe = xlnx_i2s_probe,
251 };
252
253 module_platform_driver(xlnx_i2s_aud_driver);
254
255 MODULE_LICENSE("GPL v2");
256 MODULE_AUTHOR("Praveen Vuppala  <praveenv@xilinx.com>");
257 MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu <maruthis@xilinx.com>");