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Linux/sound/soc/spear/spdif_in.c

  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 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 
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 
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, *res_fifo;
206         int ret;
207 
208         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
209         if (!res)
210                 return -EINVAL;
211 
212         res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
213         if (!res_fifo)
214                 return -EINVAL;
215 
216         if (!devm_request_mem_region(&pdev->dev, res->start,
217                                 resource_size(res), pdev->name)) {
218                 dev_warn(&pdev->dev, "Failed to get memory resourse\n");
219                 return -ENOENT;
220         }
221 
222         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
223         if (!host) {
224                 dev_warn(&pdev->dev, "kzalloc fail\n");
225                 return -ENOMEM;
226         }
227 
228         host->io_base = devm_ioremap(&pdev->dev, res->start,
229                                 resource_size(res));
230         if (!host->io_base) {
231                 dev_warn(&pdev->dev, "ioremap failed\n");
232                 return -ENOMEM;
233         }
234 
235         host->irq = platform_get_irq(pdev, 0);
236         if (host->irq < 0)
237                 return -EINVAL;
238 
239         host->clk = devm_clk_get(&pdev->dev, NULL);
240         if (IS_ERR(host->clk))
241                 return PTR_ERR(host->clk);
242 
243         pdata = dev_get_platdata(&pdev->dev);
244 
245         if (!pdata)
246                 return -EINVAL;
247 
248         host->dma_params.data = pdata->dma_params;
249         host->dma_params.addr = res_fifo->start;
250         host->dma_params.max_burst = 16;
251         host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
252         host->reset_perip = pdata->reset_perip;
253 
254         host->dev = &pdev->dev;
255         dev_set_drvdata(&pdev->dev, host);
256 
257         ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
258                         "spdif-in", host);
259         if (ret) {
260                 dev_warn(&pdev->dev, "request_irq failed\n");
261                 return ret;
262         }
263 
264         ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
265                                               &spdif_in_dai, 1);
266         if (ret)
267                 return ret;
268 
269         return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
270                                                 pdata->filter);
271 }
272 
273 static struct platform_driver spdif_in_driver = {
274         .probe          = spdif_in_probe,
275         .driver         = {
276                 .name   = "spdif-in",
277                 .owner  = THIS_MODULE,
278         },
279 };
280 
281 module_platform_driver(spdif_in_driver);
282 
283 MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
284 MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
285 MODULE_LICENSE("GPL");
286 MODULE_ALIAS("platform:spdif_in");
287 

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