1 /*
2 * ALSA SoC SPDIF In Audio Layer for spear processors
3 *
4 * Copyright (C) 2012 ST Microelectronics
5 * Vipin Kumar <vipin.kumar@st.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any
9 * warranty of any kind, whether express or implied.
10 */
11
12 #include <linux/clk.h>
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/io.h>
18 #include <linux/ioport.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <sound/dmaengine_pcm.h>
22 #include <sound/pcm.h>
23 #include <sound/pcm_params.h>
24 #include <sound/soc.h>
25 #include <sound/spear_dma.h>
26 #include <sound/spear_spdif.h>
27 #include "spdif_in_regs.h"
28 #include "spear_pcm.h"
29
30 struct spdif_in_params {
31 u32 format;
32 };
33
34 struct spdif_in_dev {
35 struct clk *clk;
36 struct spear_dma_data dma_params;
37 struct spdif_in_params saved_params;
38 void *io_base;
39 struct device *dev;
40 void (*reset_perip)(void);
41 int irq;
42 struct snd_dmaengine_dai_dma_data dma_params_rx;
43 struct snd_dmaengine_pcm_config config;
44 };
45
46 static void spdif_in_configure(struct spdif_in_dev *host)
47 {
48 u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
49 SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
50 ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
51
52 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
53 writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
54 }
55
56 static int spdif_in_dai_probe(struct snd_soc_dai *dai)
57 {
58 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
59
60 host->dma_params_rx.filter_data = &host->dma_params;
61 dai->capture_dma_data = &host->dma_params_rx;
62
63 return 0;
64 }
65
66 static void spdif_in_shutdown(struct snd_pcm_substream *substream,
67 struct snd_soc_dai *dai)
68 {
69 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
70
71 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
72 return;
73
74 writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
75 }
76
77 static void spdif_in_format(struct spdif_in_dev *host, u32 format)
78 {
79 u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
80
81 switch (format) {
82 case SNDRV_PCM_FORMAT_S16_LE:
83 ctrl |= SPDIF_XTRACT_16BIT;
84 break;
85
86 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
87 ctrl &= ~SPDIF_XTRACT_16BIT;
88 break;
89 }
90
91 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
92 }
93
94 static int spdif_in_hw_params(struct snd_pcm_substream *substream,
95 struct snd_pcm_hw_params *params,
96 struct snd_soc_dai *dai)
97 {
98 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
99 u32 format;
100
101 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
102 return -EINVAL;
103
104 format = params_format(params);
105 host->saved_params.format = format;
106
107 return 0;
108 }
109
110 static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
111 struct snd_soc_dai *dai)
112 {
113 struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
114 u32 ctrl;
115 int ret = 0;
116
117 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
118 return -EINVAL;
119
120 switch (cmd) {
121 case SNDRV_PCM_TRIGGER_START:
122 case SNDRV_PCM_TRIGGER_RESUME:
123 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
124 clk_enable(host->clk);
125 spdif_in_configure(host);
126 spdif_in_format(host, host->saved_params.format);
127
128 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
129 ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
130 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
131 writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
132 break;
133
134 case SNDRV_PCM_TRIGGER_STOP:
135 case SNDRV_PCM_TRIGGER_SUSPEND:
136 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
137 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
138 ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
139 writel(ctrl, host->io_base + SPDIF_IN_CTRL);
140 writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
141
142 if (host->reset_perip)
143 host->reset_perip();
144 clk_disable(host->clk);
145 break;
146
147 default:
148 ret = -EINVAL;
149 break;
150 }
151 return ret;
152 }
153
154 static const struct snd_soc_dai_ops spdif_in_dai_ops = {
155 .shutdown = spdif_in_shutdown,
156 .trigger = spdif_in_trigger,
157 .hw_params = spdif_in_hw_params,
158 };
159
160 static struct snd_soc_dai_driver spdif_in_dai = {
161 .probe = spdif_in_dai_probe,
162 .capture = {
163 .channels_min = 2,
164 .channels_max = 2,
165 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
166 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
167 SNDRV_PCM_RATE_192000),
168 .formats = SNDRV_PCM_FMTBIT_S16_LE | \
169 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
170 },
171 .ops = &spdif_in_dai_ops,
172 };
173
174 static const struct snd_soc_component_driver spdif_in_component = {
175 .name = "spdif-in",
176 .legacy_dai_naming = 1,
177 };
178
179 static irqreturn_t spdif_in_irq(int irq, void *arg)
180 {
181 struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
182
183 u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
184
185 if (!irq_status)
186 return IRQ_NONE;
187
188 if (irq_status & SPDIF_IRQ_FIFOWRITE)
189 dev_err(host->dev, "spdif in: fifo write error");
190 if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
191 dev_err(host->dev, "spdif in: empty fifo read error");
192 if (irq_status & SPDIF_IRQ_FIFOFULL)
193 dev_err(host->dev, "spdif in: fifo full error");
194 if (irq_status & SPDIF_IRQ_OUTOFRANGE)
195 dev_err(host->dev, "spdif in: out of range error");
196
197 writel(0, host->io_base + SPDIF_IN_IRQ);
198
199 return IRQ_HANDLED;
200 }
201
202 static int spdif_in_probe(struct platform_device *pdev)
203 {
204 struct spdif_in_dev *host;
205 struct spear_spdif_platform_data *pdata;
206 struct resource *res_fifo;
207 void __iomem *io_base;
208 int ret;
209
210 io_base = devm_platform_ioremap_resource(pdev, 0);
211 if (IS_ERR(io_base))
212 return PTR_ERR(io_base);
213
214 res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
215 if (!res_fifo)
216 return -EINVAL;
217
218 host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
219 if (!host)
220 return -ENOMEM;
221
222 host->io_base = io_base;
223 host->irq = platform_get_irq(pdev, 0);
224 if (host->irq < 0) {
225 dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq);
226 return host->irq;
227 }
228
229 host->clk = devm_clk_get(&pdev->dev, NULL);
230 if (IS_ERR(host->clk))
231 return PTR_ERR(host->clk);
232
233 pdata = dev_get_platdata(&pdev->dev);
234
235 if (!pdata)
236 return -EINVAL;
237
238 host->dma_params.data = pdata->dma_params;
239 host->dma_params.addr = res_fifo->start;
240 host->dma_params.max_burst = 16;
241 host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
242 host->reset_perip = pdata->reset_perip;
243
244 host->dev = &pdev->dev;
245 dev_set_drvdata(&pdev->dev, host);
246
247 ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
248 "spdif-in", host);
249 if (ret) {
250 dev_warn(&pdev->dev, "request_irq failed\n");
251 return ret;
252 }
253
254 ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
255 &spdif_in_dai, 1);
256 if (ret)
257 return ret;
258
259 return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
260 pdata->filter);
261 }
262
263 static struct platform_driver spdif_in_driver = {
264 .probe = spdif_in_probe,
265 .driver = {
266 .name = "spdif-in",
267 },
268 };
269
270 module_platform_driver(spdif_in_driver);
271
272 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
273 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
274 MODULE_LICENSE("GPL");
275 MODULE_ALIAS("platform:spdif_in");
276
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