1
2
3
4
5
6
7
8
9
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};
177
178static 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
201static 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
262static struct platform_driver spdif_in_driver = {
263 .probe = spdif_in_probe,
264 .driver = {
265 .name = "spdif-in",
266 },
267};
268
269module_platform_driver(spdif_in_driver);
270
271MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
272MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
273MODULE_LICENSE("GPL");
274MODULE_ALIAS("platform:spdif_in");
275
