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
30struct spdif_in_params {
31	u32 format;
32};
33
34struct 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
46static 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
56static 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
66static 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
77static 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
94static 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
110static 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
154static 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
160static 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
174static const struct snd_soc_component_driver spdif_in_component = {
175	.name			= "spdif-in",
176	.legacy_dai_naming	= 1,
177};
178
179static 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
202static 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
263static struct platform_driver spdif_in_driver = {
264	.probe		= spdif_in_probe,
265	.driver		= {
266		.name	= "spdif-in",
267	},
268};
269
270module_platform_driver(spdif_in_driver);
271
272MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
273MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
274MODULE_LICENSE("GPL");
275MODULE_ALIAS("platform:spdif_in");
276