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 
spdif_in_configure(struct spdif_in_dev * host)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 
spdif_in_dai_probe(struct snd_soc_dai * dai)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 
spdif_in_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)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 
spdif_in_format(struct spdif_in_dev * host,u32 format)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 
spdif_in_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)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 
spdif_in_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)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 };
177 
spdif_in_irq(int irq,void * arg)178 static irqreturn_t spdif_in_irq(int irq, void *arg)
179 {
180 	struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
181 
182 	u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
183 
184 	if (!irq_status)
185 		return IRQ_NONE;
186 
187 	if (irq_status & SPDIF_IRQ_FIFOWRITE)
188 		dev_err(host->dev, "spdif in: fifo write error");
189 	if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
190 		dev_err(host->dev, "spdif in: empty fifo read error");
191 	if (irq_status & SPDIF_IRQ_FIFOFULL)
192 		dev_err(host->dev, "spdif in: fifo full error");
193 	if (irq_status & SPDIF_IRQ_OUTOFRANGE)
194 		dev_err(host->dev, "spdif in: out of range error");
195 
196 	writel(0, host->io_base + SPDIF_IN_IRQ);
197 
198 	return IRQ_HANDLED;
199 }
200 
spdif_in_probe(struct platform_device * pdev)201 static int spdif_in_probe(struct platform_device *pdev)
202 {
203 	struct spdif_in_dev *host;
204 	struct spear_spdif_platform_data *pdata;
205 	struct resource *res_fifo;
206 	void __iomem *io_base;
207 	int ret;
208 
209 	io_base = devm_platform_ioremap_resource(pdev, 0);
210 	if (IS_ERR(io_base))
211 		return PTR_ERR(io_base);
212 
213 	res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
214 	if (!res_fifo)
215 		return -EINVAL;
216 
217 	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
218 	if (!host)
219 		return -ENOMEM;
220 
221 	host->io_base = io_base;
222 	host->irq = platform_get_irq(pdev, 0);
223 	if (host->irq < 0) {
224 		dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq);
225 		return host->irq;
226 	}
227 
228 	host->clk = devm_clk_get(&pdev->dev, NULL);
229 	if (IS_ERR(host->clk))
230 		return PTR_ERR(host->clk);
231 
232 	pdata = dev_get_platdata(&pdev->dev);
233 
234 	if (!pdata)
235 		return -EINVAL;
236 
237 	host->dma_params.data = pdata->dma_params;
238 	host->dma_params.addr = res_fifo->start;
239 	host->dma_params.max_burst = 16;
240 	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
241 	host->reset_perip = pdata->reset_perip;
242 
243 	host->dev = &pdev->dev;
244 	dev_set_drvdata(&pdev->dev, host);
245 
246 	ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
247 			"spdif-in", host);
248 	if (ret) {
249 		dev_warn(&pdev->dev, "request_irq failed\n");
250 		return ret;
251 	}
252 
253 	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
254 					      &spdif_in_dai, 1);
255 	if (ret)
256 		return ret;
257 
258 	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
259 						pdata->filter);
260 }
261 
262 static struct platform_driver spdif_in_driver = {
263 	.probe		= spdif_in_probe,
264 	.driver		= {
265 		.name	= "spdif-in",
266 	},
267 };
268 
269 module_platform_driver(spdif_in_driver);
270 
271 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
272 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
273 MODULE_LICENSE("GPL");
274 MODULE_ALIAS("platform:spdif_in");
275